version 7.1

remove remark about chars UBYTE type, kotlin's closest native type that can contain 0-255 is a short.

.gitignore

@@ -26,6 +26,7 @@ parser.out
 parsetab.py
 .pytest_cache/
 .attach_pid*
+compiler/lib/
 
 .gradle
 /prog8compiler.jar

.idea/codeInsightSettings.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaProjectCodeInsightSettings">
+    <excluded-names>
+      <name>kotlin.Result</name>
+    </excluded-names>
+  </component>
+</project>

.idea/compiler.xml

@@ -2,5 +2,6 @@
 <project version="4">
   <component name="CompilerConfiguration">
     <option name="BUILD_PROCESS_HEAP_SIZE" value="1200" />
+    <bytecodeTargetLevel target="11" />
   </component>
-</project>
+</project>

.idea/libraries/antlr_4_9_complete.xml

@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="antlr-4.9-complete">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/parser/antlr/lib/antlr-4.9.2-complete.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/antlr_antlr4.xml

@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="antlr.antlr4" type="repository">
+    <properties maven-id="org.antlr:antlr4:4.9.2">
+      <exclude>
+        <dependency maven-id="com.ibm.icu:icu4j" />
+      </exclude>
+    </properties>
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/antlr/antlr4/4.9.2/antlr4-4.9.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/antlr/antlr4-runtime/4.9.2/antlr4-runtime-4.9.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/antlr/antlr-runtime/3.5.2/antlr-runtime-3.5.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/antlr/ST4/4.3/ST4-4.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/abego/treelayout/org.abego.treelayout.core/1.0.3/org.abego.treelayout.core-1.0.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/glassfish/javax.json/1.0.4/javax.json-1.0.4.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/antlr_runtime_4_9.xml

@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="antlr-runtime-4.9">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/parser/antlr/lib/antlr-runtime-4.9.2.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/dbus_java_3_2_4.xml

@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="dbus-java-3.2.4">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/dbusCompilerService/lib/dbus-java-3.2.4.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/github_hypfvieh_dbus_java.xml

@@ -0,0 +1,25 @@
+<component name="libraryTable">
+  <library name="github.hypfvieh.dbus.java" type="repository">
+    <properties maven-id="com.github.hypfvieh:dbus-java:3.3.0" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/hypfvieh/dbus-java/3.3.0/dbus-java-3.3.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-unixsocket/0.38.5/jnr-unixsocket-0.38.5.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-ffi/2.2.1/jnr-ffi-2.2.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jffi/1.3.1/jffi-1.3.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jffi/1.3.1/jffi-1.3.1-native.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/ow2/asm/asm/9.0/asm-9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/ow2/asm/asm-commons/9.0/asm-commons-9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/ow2/asm/asm-analysis/9.0/asm-analysis-9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/ow2/asm/asm-tree/9.0/asm-tree-9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/ow2/asm/asm-util/9.0/asm-util-9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-a64asm/1.0.0/jnr-a64asm-1.0.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-x86asm/1.0.2/jnr-x86asm-1.0.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-constants/0.10.1/jnr-constants-0.10.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-enxio/0.32.3/jnr-enxio-0.32.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/jnr/jnr-posix/3.1.4/jnr-posix-3.1.4.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-api/1.7.30/slf4j-api-1.7.30.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/glassfish_javax_json.xml

@@ -0,0 +1,10 @@
+<component name="libraryTable">
+  <library name="glassfish.javax.json" type="repository">
+    <properties include-transitive-deps="false" maven-id="org.glassfish:javax.json:1.1.4" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/glassfish/javax.json/1.1.4/javax.json-1.1.4.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/hamcrest.xml

@@ -0,0 +1,10 @@
+<component name="libraryTable">
+  <library name="hamcrest" type="repository">
+    <properties maven-id="org.hamcrest:hamcrest:2.2" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest/2.2/hamcrest-2.2.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/javax_json_api_1_1_4.xml

@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="javax.json-api-1.1.4">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/javax.json-api-1.1.4.jar!/" />
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/javax.json-1.1.4.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/jetbrains_kotlinx_cli_jvm.xml

@@ -0,0 +1,10 @@
+<component name="libraryTable">
+  <library name="jetbrains.kotlinx.cli.jvm" type="repository">
+    <properties include-transitive-deps="false" maven-id="org.jetbrains.kotlinx:kotlinx-cli-jvm:0.3.3" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-cli-jvm/0.3.3/kotlinx-cli-jvm-0.3.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/junit_jupiter.xml

@@ -0,0 +1,17 @@
+<component name="libraryTable">
+  <library name="junit.jupiter" type="repository">
+    <properties maven-id="org.junit.jupiter:junit-jupiter:5.7.2" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.7.2/junit-jupiter-5.7.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.7.2/junit-jupiter-api-5.7.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.0/apiguardian-api-1.1.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.7.2/junit-platform-commons-1.7.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.7.2/junit-jupiter-params-5.7.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.7.2/junit-jupiter-engine-5.7.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.7.2/junit-platform-engine-1.7.2.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/kotlinx_cli_jvm.xml

@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="kotlinx-cli-jvm">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/compiler/lib/kotlinx-cli-jvm-0.3.2.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/michael_bull_kotlin_result_jvm.xml

@@ -0,0 +1,15 @@
+<component name="libraryTable">
+  <library name="michael.bull.kotlin.result.jvm" type="repository">
+    <properties maven-id="com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.12" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/michael-bull/kotlin-result/kotlin-result-jvm/1.1.12/kotlin-result-jvm-1.1.12.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.10/kotlin-stdlib-jdk8-1.5.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.5.10/kotlin-stdlib-1.5.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.5.10/kotlin-stdlib-jdk7-1.5.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.5.10/kotlin-stdlib-common-1.5.10.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/slf4j_api_1_7_30.xml

@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="slf4j-api-1.7.30">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/slf4j-api-1.7.30.jar!/" />
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/slf4j-simple-1.7.30.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/slf4j_simple.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="slf4j.simple" type="repository">
+    <properties maven-id="org.slf4j:slf4j-simple:1.7.30" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-simple/1.7.30/slf4j-simple-1.7.30.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-api/1.7.30/slf4j-api-1.7.30.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/takes.xml

@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="takes" type="repository">
+    <properties maven-id="org.takes:takes:1.19" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/takes/takes/1.19/takes-1.19.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/cactoos/cactoos/0.42/cactoos-0.42.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-text/1.4/commons-text-1.4.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-lang3/3.7/commons-lang3-3.7.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/takes_http.xml

@@ -1,12 +0,0 @@
-<component name="libraryTable">
-  <library name="takes-http">
-    <CLASSES>
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/cactoos-0.42.jar!/" />
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/commons-lang3-3.7.jar!/" />
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/commons-text-1.4.jar!/" />
-      <root url="jar://$PROJECT_DIR$/httpCompilerService/lib/takes-1.19.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>

.idea/libraries/unittest_libs.xml

@@ -1,10 +0,0 @@
-<component name="libraryTable">
-  <library name="unittest-libs">
-    <CLASSES>
-      <root url="file://$PROJECT_DIR$/compiler/lib" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-    <jarDirectory url="file://$PROJECT_DIR$/compiler/lib" recursive="false" />
-  </library>
-</component>

.idea/misc.xml

@@ -4,7 +4,7 @@
     <option name="perGrammarGenerationSettings">
       <list>
         <PerGrammarGenerationSettings>
-          <option name="fileName" value="$PROJECT_DIR$/parser/antlr/prog8.g4" />
+          <option name="fileName" value="$PROJECT_DIR$/parser/antlr/Prog8ANTLR.g4" />
           <option name="autoGen" value="true" />
           <option name="outputDir" value="$PROJECT_DIR$/parser/src/prog8/parser" />
           <option name="libDir" value="" />
@@ -16,7 +16,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="false" project-jdk-name="Kotlin SDK" project-jdk-type="KotlinSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="Kotlin SDK" project-jdk-type="KotlinSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
-</project>
+</project>

.travis.yml

@@ -1,11 +0,0 @@
-language: java
-sudo: false
-# jdk: openjdk8
-# dist: xenial
-
-before_install:
-  - chmod +x ./gradlew
-
-script:
-  - ./gradlew test
-

CompilerDevelopment.md

@@ -0,0 +1,32 @@
+#### Just a few remarks upfront:
+* There is the (gradle/IDEA) module `parser`: that's the parser generated by ANTLR4, in Java. The only file to be edited here is the grammar, `prog8.g4`.
+* Then we have the module `compilerAst` - in Kotlin - which uses `parser` and adds AST nodes. Here we put our additions to the generated thing, *including any tests of the parsing stage*.
+  - the name is a bit misleading, as this module isn't (or, resp. shouldn't be; see below) about *compiling*, only the parsing stage
+  - also, the tree that comes out isn't much of an *abstraction*, but rather still more or less a parse tree (this might very well change).
+  - **However, let's not *yet* rename the module.** We'll find a good name during refactoring.
+
+#### Problems with `compilerAst`:
+* `ModuleImporter.kt`, doing (Prog8-) module resolution. That's not the parser's job.
+* `ParsingFailedError` (in `ModuleParsing.kt`): this exception (it is actually *not* a `java.lang.Error`...) is thrown in a number of places, where other exceptions would make more sense. For example: not finding a file should just yield a `NoSuchFileException`, not this one. The other problem with it is that it does not provide any additional information about the source of parsing error, in particular a `Position`.
+* During parsing, character literals are turned into UBYTEs (since there is no basic type e.g. CHAR). That's bad because it depends on a specific character encoding (`IStringEncoding` in `compilerAst/src/prog8/ast/AstToplevel.kt`) of/for some target platform. Note that *strings* are indeed encoded later, in the `compiler` module.
+* The same argument applies to `IMemSizer`, and - not entirely sure about that - `IBuiltinFunctions`.
+
+#### Steps to take, in conceptual (!) order:
+1. introduce an abstraction `SourceCode` that encapsulates the origin and actual loading of Prog8 source code
+   - from the local file system (use case: user programs)
+   - from resources (prog8lib)
+   - from plain strings (for testing)
+2. add subclass `ParseError : ParsingFailedError` which adds information about the *source of parsing error* (`SourceCode` and `Position`). We cannot just replace `ParsingFailedError`  right away because it is so widely used (even in the `compiler` module). Therefore we'll just subclass for the time being, add more and more tests requiring the new one to be thrown (or, resp., NOT to be thrown), and gradually transition.
+3. introduce a minimal interface to the outside, input: `SourceCode`, output: a tree with a `Module` node as the root
+   - this will be the Kotlin singleton `Prog8Parser` with the main method `parseModule`
+   - plus, optionally, method's for registering/unregistering a listener with the parser
+   - the *only* exception ever thrown / reported to listeners (TBD) will be `ParseError`
+   - anything related to the lexer, error strategies, character/token streams is hidden from the outside
+   - to make a clear distinction between the *generated* parser (and lexer) vs. `Prog8Parser`, and to discourage directly using the generated stuff, we'll rename the existing `prog8Parser`/`prog8Lexer` to `Prog8ANTLRParser` and `Prog8ANTLRLexer` and move them to package `prog8.parser.generated`
+4. introduce AST node `CharLiteral` and keep them until after identifier resolution and type checking; insert there an AST transformation step that turns them in UBYTE constants (literals)
+5. remove uses of `IStringEncoding` from module `compilerAst` - none should be necessary anymore
+6. move `IStringEncoding` to module `compiler`
+7. same with `ModuleImporter`, then rewrite that (addressing #46)
+8. refactor AST nodes and grammar: less generated parse tree nodes (`XyzContext`), less intermediary stuff (private classes in `Antrl2Kotlin.kt`), more compact code. Also: nicer names such as simply `StringLiteral` instead of `StringLiteralValue`
+9. re-think `IStringEncoding` to address #38
+

README.md

@@ -1,5 +1,3 @@
-[![saythanks](https://img.shields.io/badge/say-thanks-ff69b4.svg)](https://saythanks.io/to/irmen)
-[![Build Status](https://travis-ci.org/irmen/prog8.svg?branch=master)](https://travis-ci.org/irmen/prog8)
 [![Documentation](https://readthedocs.org/projects/prog8/badge/?version=latest)](https://prog8.readthedocs.io/)
 
 Prog8 - Structured Programming Language for 8-bit 6502/65c02 microprocessors

build.gradle

@@ -1,3 +1,3 @@
 plugins {
-    id "org.jetbrains.kotlin.jvm" version "1.5.20" apply false
+    id "org.jetbrains.kotlin.jvm" version "1.5.30" apply false
 }

compiler/build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'java'
     id 'application'
     id "org.jetbrains.kotlin.jvm"
-    id 'com.github.johnrengelman.shadow' version '7.0.0'
+    id 'com.github.johnrengelman.shadow' version '7.1.0'
 }
 
 targetCompatibility = 11
@@ -21,12 +21,13 @@ dependencies {
     implementation project(':compilerAst')
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     // implementation "org.jetbrains.kotlin:kotlin-reflect"
-    implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.2'
+    implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.3'
+    implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.12"
 
     testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.2'
-    testImplementation 'org.hamcrest:hamcrest-junit:2.0.0.0'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
+    testImplementation 'org.hamcrest:hamcrest:2.2'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
 }
 
 configurations.all {
@@ -70,7 +71,8 @@ sourceSets {
     }
     test {
         java {
-            srcDirs = ["${project.projectDir}/test"]
+            srcDir "${project.projectDir}/test"
+            srcDir "${project(':compilerAst').projectDir}/test/helpers"
         }
     }
 }

compiler/compiler.iml

@@ -16,9 +16,11 @@
     <orderEntry type="jdk" jdkName="openjdk-11" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
-    <orderEntry type="library" name="unittest-libs" level="project" />
-    <orderEntry type="library" name="kotlinx-cli-jvm" level="project" />
     <orderEntry type="module" module-name="compilerAst" />
     <orderEntry type="library" name="Python 3.9 interpreter library" level="application" />
+    <orderEntry type="library" name="hamcrest" level="project" />
+    <orderEntry type="library" name="jetbrains.kotlinx.cli.jvm" level="project" />
+    <orderEntry type="library" name="junit.jupiter" level="project" />
+    <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
   </component>
 </module>

compiler/res/prog8lib/c64/floats.p8

@@ -4,7 +4,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target c64
 %option enable_floats
 
 floats {

compiler/res/prog8lib/c64/graphics.p8

@@ -1,4 +1,3 @@
-%target c64
 %import textio
 
 ; bitmap pixel graphics module for the C64

compiler/res/prog8lib/c64/syslib.p8

@@ -5,8 +5,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target c64
-
 c64 {
         &ubyte  TIME_HI         = $a0       ; software jiffy clock, hi byte
         &ubyte  TIME_MID        = $a1       ;  .. mid byte
@@ -502,11 +500,9 @@ sys {
         ; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
         ;     note: a more accurate way to wait for vsync is to set up a vsync irq handler instead.
         %asm {{
--           lda  c64.RASTER
-            beq  -
--           lda  c64.RASTER
-            bne  -
-            bit  c64.SCROLY
+-           bit  c64.SCROLY
+            bpl  -
+-           bit  c64.SCROLY
             bmi  -
             rts
         }}

compiler/res/prog8lib/c64/textio.p8

@@ -4,7 +4,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target c64
 %import syslib
 %import conv
 

compiler/res/prog8lib/cx16/floats.p8

@@ -4,7 +4,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target cx16
 %option enable_floats
 
 floats {

compiler/res/prog8lib/cx16/gfx2.p8

@@ -1,5 +1,3 @@
-%target cx16
-
 ; Bitmap pixel graphics routines for the CommanderX16
 ; Custom routines to use the full-screen 640x480 and 320x240 screen modes.
 ; (These modes are not supported by the documented GRAPH_xxxx kernal routines)

compiler/res/prog8lib/cx16/graphics.p8

@@ -1,4 +1,3 @@
-%target cx16
 %import syslib
 %import textio
 

compiler/res/prog8lib/cx16/palette.p8

@@ -1,5 +1,3 @@
-%target cx16
-
 ; Manipulate the Commander X16's display color palette.
 ; Should you want to restore the default palette, you have to reinitialize the Vera yourself.
 
@@ -9,7 +7,7 @@ palette {
     ubyte c
 
     sub set_color(ubyte index, uword color) {
-        vera_palette_ptr = $fa00+index*2
+        vera_palette_ptr = $fa00+(index as uword * 2)
         cx16.vpoke(1, vera_palette_ptr, lsb(color))
         vera_palette_ptr++
         cx16.vpoke(1, vera_palette_ptr, msb(color))
@@ -70,11 +68,11 @@ palette {
         }
     }
 
-    inline sub set_all_black() {
+    sub set_all_black() {
         set_monochrome($000, $000)
     }
 
-    inline sub set_all_white() {
+    sub set_all_white() {
         set_monochrome($fff, $fff)
     }
 

compiler/res/prog8lib/cx16/syslib.p8

@@ -5,9 +5,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target cx16
-
-
 c64 {
 
 ; ---- kernal routines, these are the same as on the Commodore-64 (hence the same block name) ----

compiler/res/prog8lib/cx16/textio.p8

@@ -4,7 +4,6 @@
 ;
 ; indent format: TABS, size=8
 
-%target cx16
 %import syslib
 %import conv
 

compiler/res/version.txt

@@ -1 +1 @@
-7.0
+7.1

compiler/src/prog8/CompilerMain.kt

@@ -16,55 +16,54 @@ import kotlin.system.exitProcess
 
 
 fun main(args: Array<String>) {
-    printSoftwareHeader("compiler")
-
-    compileMain(args)
-}
-
-internal fun printSoftwareHeader(what: String) {
     val buildVersion = object {}.javaClass.getResource("/version.txt").readText().trim()
-    println("\nProg8 $what v$buildVersion by Irmen de Jong (irmen@razorvine.net)")
+    println("\nProg8 compiler v$buildVersion by Irmen de Jong (irmen@razorvine.net)")
     println("This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html\n")
+
+    val succes = compileMain(args)
+    if(!succes)
+        exitProcess(1)
 }
 
 
 fun pathFrom(stringPath: String, vararg rest: String): Path  = FileSystems.getDefault().getPath(stringPath, *rest)
 
 
-private fun compileMain(args: Array<String>) {
+private fun compileMain(args: Array<String>): Boolean {
     val cli = ArgParser("prog8compiler", prefixStyle = ArgParser.OptionPrefixStyle.JVM)
-    val startEmulator by cli.option(ArgType.Boolean, fullName = "emu", description = "auto-start emulator after successful compilation")
+    val startEmulator1 by cli.option(ArgType.Boolean, fullName = "emu", description = "auto-start emulator after successful compilation")
+    val startEmulator2 by cli.option(ArgType.Boolean, fullName = "emu2", description = "auto-start alternative emulator after successful compilation")
     val outputDir by cli.option(ArgType.String, fullName = "out", description = "directory for output files instead of current directory").default(".")
     val dontWriteAssembly by cli.option(ArgType.Boolean, fullName = "noasm", description="don't create assembly code")
     val dontOptimize by cli.option(ArgType.Boolean, fullName = "noopt", description = "don't perform any optimizations")
     val watchMode by cli.option(ArgType.Boolean, fullName = "watch", description = "continuous compilation mode (watches for file changes), greatly increases compilation speed")
     val slowCodegenWarnings by cli.option(ArgType.Boolean, fullName = "slowwarn", description="show debug warnings about slow/problematic assembly code generation")
     val compilationTarget by cli.option(ArgType.String, fullName = "target", description = "target output of the compiler, currently '${C64Target.name}' and '${Cx16Target.name}' available").default(C64Target.name)
-    val libDirs by cli.option(ArgType.String, fullName="libdirs", description = "list of extra paths to search in for imported modules").multiple().delimiter(File.pathSeparator)
+    val sourceDirs by cli.option(ArgType.String, fullName="srcdirs", description = "list of extra paths to search in for imported modules").multiple().delimiter(File.pathSeparator)
     val moduleFiles by cli.argument(ArgType.String, fullName = "modules", description = "main module file(s) to compile").multiple(999)
 
     try {
         cli.parse(args)
     } catch (e: IllegalStateException) {
         System.err.println(e.message)
-        exitProcess(1)
+        return false
     }
 
     val outputPath = pathFrom(outputDir)
     if(!outputPath.toFile().isDirectory) {
         System.err.println("Output path doesn't exist")
-        exitProcess(1)
+        return false
     }
 
     val faultyOption = moduleFiles.firstOrNull { it.startsWith('-') }
     if(faultyOption!=null) {
         System.err.println("Unknown command line option given: $faultyOption")
-        exitProcess(1)
+        return false
     }
 
-    val libdirs = libDirs.toMutableList()
-    if(libdirs.firstOrNull()!=".")
-        libdirs.add(0, ".")
+    val srcdirs = sourceDirs.toMutableList()
+    if(srcdirs.firstOrNull()!=".")
+        srcdirs.add(0, ".")
 
     if(watchMode==true) {
         val watchservice = FileSystems.getDefault().newWatchService()
@@ -75,7 +74,7 @@ private fun compileMain(args: Array<String>) {
             val results = mutableListOf<CompilationResult>()
             for(filepathRaw in moduleFiles) {
                 val filepath = pathFrom(filepathRaw).normalize()
-                val compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, libdirs, outputPath)
+                val compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, srcdirs, outputPath)
                 results.add(compilationResult)
             }
 
@@ -86,7 +85,7 @@ private fun compileMain(args: Array<String>) {
             for (importedFile in allImportedFiles) {
                 print("  ")
                 println(importedFile)
-                val watchDir = importedFile.parent ?: Path.of(".")
+                val watchDir = importedFile.parent ?: Path.of("")
                 watchDir.register(watchservice, StandardWatchEventKinds.ENTRY_MODIFY)
             }
             println("[${LocalDateTime.now().withNano(0)}]  Waiting for file changes.")
@@ -112,22 +111,30 @@ private fun compileMain(args: Array<String>) {
             val filepath = pathFrom(filepathRaw).normalize()
             val compilationResult: CompilationResult
             try {
-                compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, libdirs, outputPath)
+                compilationResult = compileProgram(filepath, dontOptimize!=true, dontWriteAssembly!=true, slowCodegenWarnings==true, compilationTarget, srcdirs, outputPath)
                 if(!compilationResult.success)
-                    exitProcess(1)
+                    return false
             } catch (x: ParsingFailedError) {
-                exitProcess(1)
+                return false
             } catch (x: AstException) {
-                exitProcess(1)
+                return false
             }
 
-            if (startEmulator==true) {
-                if (compilationResult.programName.isEmpty())
+            if(startEmulator1==true || startEmulator2==true) {
+                if (compilationResult.programName.isEmpty()) {
                     println("\nCan't start emulator because no program was assembled.")
-                else {
-                    compilationResult.compTarget.machine.launchEmulator(compilationResult.programName)
+                    return true
                 }
             }
+
+            val programNameInPath = outputPath.resolve(compilationResult.programName)
+
+            if (startEmulator1==true)
+                compilationResult.compTarget.machine.launchEmulator(1, programNameInPath)
+            else if (startEmulator2==true)
+                compilationResult.compTarget.machine.launchEmulator(2, programNameInPath)
         }
     }
+
+    return true
 }

compiler/src/prog8/compiler/BeforeAsmGenerationAstChanger.kt

@@ -9,6 +9,7 @@ import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.ast.walk.IAstVisitor
+import prog8.compiler.astprocessing.isInRegularRAMof
 import prog8.compiler.target.ICompilationTarget
 
 
@@ -22,7 +23,7 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
             // This allows you to restart the program and have the same starting values of the variables
             if(decl.allowInitializeWithZero)
             {
-                val nextAssign = decl.definingScope().nextSibling(decl) as? Assignment
+                val nextAssign = decl.definingScope.nextSibling(decl) as? Assignment
                 if (nextAssign != null && nextAssign.target isSameAs IdentifierReference(listOf(decl.name), Position.DUMMY))
                     decl.value = null
                 else {
@@ -39,7 +40,7 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
         // But it can only be done if the target variable IS NOT OCCURRING AS AN OPERAND ITSELF.
         if(!assignment.isAugmentable
                 && assignment.target.identifier != null
-                && compTarget.isInRegularRAM(assignment.target, program)) {
+                && assignment.target.isInRegularRAMof(compTarget.machine)) {
             val binExpr = assignment.value as? BinaryExpression
             if (binExpr != null && binExpr.operator !in comparisonOperators) {
                 if (binExpr.left !is BinaryExpression) {
@@ -51,14 +52,14 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
                             // use the other part of the expression to split.
                             val assignRight = Assignment(assignment.target, binExpr.right, assignment.position)
                             return listOf(
-                                    IAstModification.InsertBefore(assignment, assignRight, assignment.definingScope()),
+                                    IAstModification.InsertBefore(assignment, assignRight, assignment.definingScope),
                                     IAstModification.ReplaceNode(binExpr.right, binExpr.left, binExpr),
                                     IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
                         }
                     } else {
                         val assignLeft = Assignment(assignment.target, binExpr.left, assignment.position)
                         return listOf(
-                                IAstModification.InsertBefore(assignment, assignLeft, assignment.definingScope()),
+                                IAstModification.InsertBefore(assignment, assignLeft, assignment.definingScope),
                                 IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
                     }
                 }
@@ -80,7 +81,7 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
         val decls = scope.statements.filterIsInstance<VarDecl>().filter { it.type == VarDeclType.VAR }
         subroutineVariables.addAll(decls.map { it.name to it })
 
-        val sub = scope.definingSubroutine()
+        val sub = scope.definingSubroutine
         if (sub != null) {
             // move any remaining vardecls of the scope into the upper scope. Make sure the position remains the same!
             val replacements = mutableListOf<IAstModification>()
@@ -119,17 +120,17 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
         // and if an assembly block doesn't contain a rts/rti, and some other situations.
         val mods = mutableListOf<IAstModification>()
         val returnStmt = Return(null, subroutine.position)
-        if (subroutine.asmAddress == null
-                && !subroutine.inline
-                && subroutine.statements.isNotEmpty()
-                && subroutine.amountOfRtsInAsm() == 0
+        if (subroutine.asmAddress == null && !subroutine.inline) {
+            if(subroutine.statements.isEmpty() ||
+                (subroutine.amountOfRtsInAsm() == 0
                 && subroutine.statements.lastOrNull { it !is VarDecl } !is Return
-                && subroutine.statements.last() !is Subroutine) {
-            mods += IAstModification.InsertLast(returnStmt, subroutine)
+                && subroutine.statements.last() !is Subroutine)) {
+                    mods += IAstModification.InsertLast(returnStmt, subroutine)
+            }
         }
 
         // precede a subroutine with a return to avoid falling through into the subroutine from code above it
-        val outerScope = subroutine.definingScope()
+        val outerScope = subroutine.definingScope
         val outerStatements = outerScope.statements
         val subroutineStmtIdx = outerStatements.indexOf(subroutine)
         if (subroutineStmtIdx > 0
@@ -146,7 +147,7 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
         // see if we can remove superfluous typecasts (outside of expressions)
         // such as casting byte<->ubyte,  word<->uword
         // Also the special typecast of a reference type (str, array) to an UWORD will be changed into address-of.
-        val sourceDt = typecast.expression.inferType(program).typeOrElse(DataType.UNDEFINED)
+        val sourceDt = typecast.expression.inferType(program).getOr(DataType.UNDEFINED)
         if (typecast.type in ByteDatatypes && sourceDt in ByteDatatypes
                 || typecast.type in WordDatatypes && sourceDt in WordDatatypes) {
             if(typecast.parent !is Expression) {
@@ -266,8 +267,8 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
             // if the datatype of the arguments of cmp() are different, cast the byte one to word.
             val arg1 = functionCallStatement.args[0]
             val arg2 = functionCallStatement.args[1]
-            val dt1 = arg1.inferType(program).typeOrElse(DataType.UNDEFINED)
-            val dt2 = arg2.inferType(program).typeOrElse(DataType.UNDEFINED)
+            val dt1 = arg1.inferType(program).getOr(DataType.UNDEFINED)
+            val dt2 = arg2.inferType(program).getOr(DataType.UNDEFINED)
             if(dt1 in ByteDatatypes) {
                 if(dt2 in ByteDatatypes)
                     return noModifications
@@ -339,14 +340,14 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
 
     private fun getAutoIndexerVarFor(expr: ArrayIndexedExpression): MutableList<IAstModification> {
         val modifications = mutableListOf<IAstModification>()
-        val statement = expr.containingStatement()
+        val statement = expr.containingStatement
         val dt = expr.indexer.indexExpr.inferType(program)
-        val register = if(dt.istype(DataType.UBYTE) || dt.istype(DataType.BYTE)) "r9L" else "r9"
+        val register = if(dt istype DataType.UBYTE  || dt istype DataType.BYTE ) "r9L" else "r9"
         // replace the indexer with just the variable (simply use a cx16 virtual register r9, that we HOPE is not used for other things in the expression...)
         // assign the indexing expression to the helper variable, but only if that hasn't been done already
         val target = AssignTarget(IdentifierReference(listOf("cx16", register), expr.indexer.position), null, null, expr.indexer.position)
         val assign = Assignment(target, expr.indexer.indexExpr, expr.indexer.position)
-        modifications.add(IAstModification.InsertBefore(statement, assign, statement.definingScope()))
+        modifications.add(IAstModification.InsertBefore(statement, assign, statement.definingScope))
         modifications.add(IAstModification.ReplaceNode(expr.indexer.indexExpr, target.identifier!!.copy(), expr.indexer))
         return modifications
     }

compiler/src/prog8/compiler/Compiler.kt

@@ -1,5 +1,6 @@
 package prog8.compiler
 
+import com.github.michaelbull.result.*
 import prog8.ast.AstToSourceCode
 import prog8.ast.IBuiltinFunctions
 import prog8.ast.IMemSizer
@@ -16,13 +17,14 @@ import prog8.compiler.target.Cx16Target
 import prog8.compiler.target.ICompilationTarget
 import prog8.compiler.target.asmGeneratorFor
 import prog8.optimizer.*
-import prog8.parser.ModuleImporter
+import prog8.parser.ParseError
 import prog8.parser.ParsingFailedError
-import prog8.parser.moduleName
+import prog8.parser.SourceCode
+import prog8.parser.SourceCode.Companion.libraryFilePrefix
 import java.io.File
-import java.io.InputStream
 import java.nio.file.Path
-import kotlin.system.exitProcess
+import kotlin.io.path.Path
+import kotlin.io.path.nameWithoutExtension
 import kotlin.system.measureTimeMillis
 
 
@@ -70,7 +72,7 @@ fun compileProgram(filepath: Path,
                    writeAssembly: Boolean,
                    slowCodegenWarnings: Boolean,
                    compilationTarget: String,
-                   libdirs: List<String>,
+                   sourceDirs: List<String>,
                    outputDir: Path): CompilationResult {
     var programName = ""
     lateinit var programAst: Program
@@ -81,38 +83,52 @@ fun compileProgram(filepath: Path,
         when(compilationTarget) {
             C64Target.name -> C64Target
             Cx16Target.name -> Cx16Target
-            else -> {
-                System.err.println("invalid compilation target")
-                exitProcess(1)
-            }
+            else -> throw IllegalArgumentException("invalid compilation target")
         }
 
     try {
         val totalTime = measureTimeMillis {
             // import main module and everything it needs
-            val (ast, compilationOptions, imported) = parseImports(filepath, errors, compTarget, libdirs)
+            val (ast, compilationOptions, imported) = parseImports(filepath, errors, compTarget, sourceDirs)
             compilationOptions.slowCodegenWarnings = slowCodegenWarnings
             compilationOptions.optimize = optimize
             programAst = ast
             importedFiles = imported
             processAst(programAst, errors, compilationOptions)
             if (compilationOptions.optimize)
-                optimizeAst(programAst, errors, BuiltinFunctionsFacade(BuiltinFunctions), compTarget, compilationOptions)
+                optimizeAst(
+                    programAst,
+                    errors,
+                    BuiltinFunctionsFacade(BuiltinFunctions),
+                    compTarget,
+                    compilationOptions
+                )
             postprocessAst(programAst, errors, compilationOptions)
 
             // printAst(programAst)
 
-            if(writeAssembly)
-                programName = writeAssembly(programAst, errors, outputDir, compilationOptions)
+            if (writeAssembly) {
+                val result = writeAssembly(programAst, errors, outputDir, compilationOptions)
+                when (result) {
+                    is WriteAssemblyResult.Ok -> programName = result.filename
+                    is WriteAssemblyResult.Fail -> {
+                        System.err.println(result.error)
+                        return CompilationResult(false, programAst, programName, compTarget, importedFiles)
+                    }
+                }
+            }
         }
         System.out.flush()
         System.err.flush()
         println("\nTotal compilation+assemble time: ${totalTime / 1000.0} sec.")
         return CompilationResult(true, programAst, programName, compTarget, importedFiles)
-
-    } catch (px: ParsingFailedError) {
+    } catch (px: ParseError) {
         System.err.print("\u001b[91m")  // bright red
-        System.err.println(px.message)
+        System.err.println("${px.position.toClickableStr()} parse error: ${px.message}".trim())
+        System.err.print("\u001b[0m")  // reset
+    } catch (pfx: ParsingFailedError) {
+        System.err.print("\u001b[91m")  // bright red
+        System.err.println(pfx.message)
         System.err.print("\u001b[0m")  // reset
     } catch (ax: AstException) {
         System.err.print("\u001b[91m")  // bright red
@@ -132,7 +148,7 @@ fun compileProgram(filepath: Path,
         throw x
     }
 
-    val failedProgram = Program("failed", mutableListOf(), BuiltinFunctionsFacade(BuiltinFunctions), compTarget)
+    val failedProgram = Program("failed", BuiltinFunctionsFacade(BuiltinFunctions), compTarget)
     return CompilationResult(false, failedProgram, programName, compTarget, emptyList())
 }
 
@@ -166,27 +182,29 @@ private class BuiltinFunctionsFacade(functions: Map<String, FSignature>): IBuilt
         builtinFunctionReturnType(name, args, program)
 }
 
-private fun parseImports(filepath: Path,
-                         errors: IErrorReporter,
-                         compTarget: ICompilationTarget,
-                         libdirs: List<String>): Triple<Program, CompilationOptions, List<Path>> {
-    val compilationTargetName = compTarget.name
-    println("Compiler target: $compilationTargetName. Parsing...")
+fun parseImports(filepath: Path,
+                 errors: IErrorReporter,
+                 compTarget: ICompilationTarget,
+                 sourceDirs: List<String>): Triple<Program, CompilationOptions, List<Path>> {
+    println("Compiler target: ${compTarget.name}. Parsing...")
     val bf = BuiltinFunctionsFacade(BuiltinFunctions)
-    val programAst = Program(moduleName(filepath.fileName), mutableListOf(), bf, compTarget)
+    val programAst = Program(filepath.nameWithoutExtension, bf, compTarget)
     bf.program = programAst
 
-    val importer = ModuleImporter(programAst, compTarget, compilationTargetName, libdirs)
-    importer.importModule(filepath)
+    val importer = ModuleImporter(programAst, compTarget.name, errors, sourceDirs)
+    val importedModuleResult = importer.importModule(filepath)
+    importedModuleResult.onFailure { throw it }
     errors.report()
 
-    val importedFiles = programAst.modules.filter { !it.source.startsWith("@embedded@") }.map { it.source }
+    val importedFiles = programAst.modules.map { it.source }
+        .filter { it.isFromFilesystem }
+        .map { Path(it.origin) }
     val compilerOptions = determineCompilationOptions(programAst, compTarget)
     if (compilerOptions.launcher == LauncherType.BASIC && compilerOptions.output != OutputType.PRG)
         throw ParsingFailedError("${programAst.modules.first().position} BASIC launcher requires output type PRG.")
 
     // depending on the machine and compiler options we may have to include some libraries
-    for(lib in compTarget.machine.importLibs(compilerOptions, compilationTargetName))
+    for(lib in compTarget.machine.importLibs(compilerOptions, compTarget.name))
         importer.importLibraryModule(lib)
 
     // always import prog8_lib and math
@@ -196,13 +214,13 @@ private fun parseImports(filepath: Path,
     return Triple(programAst, compilerOptions, importedFiles)
 }
 
-private fun determineCompilationOptions(program: Program, compTarget: ICompilationTarget): CompilationOptions {
-    val mainModule = program.mainModule
-    val outputType = (mainModule.statements.singleOrNull { it is Directive && it.directive == "%output" }
-            as? Directive)?.args?.single()?.name?.uppercase()
-    val launcherType = (mainModule.statements.singleOrNull { it is Directive && it.directive == "%launcher" }
-            as? Directive)?.args?.single()?.name?.uppercase()
-    val zpoption: String? = (mainModule.statements.singleOrNull { it is Directive && it.directive == "%zeropage" }
+fun determineCompilationOptions(program: Program, compTarget: ICompilationTarget): CompilationOptions {
+    val toplevelModule = program.toplevelModule
+    val outputDirective = (toplevelModule.statements.singleOrNull { it is Directive && it.directive == "%output" } as? Directive)
+    val launcherDirective = (toplevelModule.statements.singleOrNull { it is Directive && it.directive == "%launcher" } as? Directive)
+    val outputTypeStr = outputDirective?.args?.single()?.name?.uppercase()
+    val launcherTypeStr = launcherDirective?.args?.single()?.name?.uppercase()
+    val zpoption: String? = (toplevelModule.statements.singleOrNull { it is Directive && it.directive == "%zeropage" }
             as? Directive)?.args?.single()?.name?.uppercase()
     val allOptions = program.modules.flatMap { it.statements }.filter { it is Directive && it.directive == "%option" }
         .flatMap { (it as Directive).args }.toSet()
@@ -224,25 +242,33 @@ private fun determineCompilationOptions(program: Program, compTarget: ICompilati
         zpType = ZeropageType.BASICSAFE
     }
 
-    val zpReserved = mainModule.statements
+    val zpReserved = toplevelModule.statements
         .asSequence()
         .filter { it is Directive && it.directive == "%zpreserved" }
         .map { (it as Directive).args }
         .map { it[0].int!!..it[1].int!! }
         .toList()
 
-    if (outputType != null && !OutputType.values().any { it.name == outputType }) {
-        System.err.println("invalid output type $outputType")
-        exitProcess(1)
+    val outputType = if (outputTypeStr == null) OutputType.PRG else {
+        try {
+            OutputType.valueOf(outputTypeStr)
+        } catch (x: IllegalArgumentException) {
+            // set default value; actual check and error handling of invalid option is handled in the AstChecker later
+            OutputType.PRG
+        }
     }
-    if (launcherType != null && !LauncherType.values().any { it.name == launcherType }) {
-        System.err.println("invalid launcher type $launcherType")
-        exitProcess(1)
+    val launcherType = if (launcherTypeStr == null) LauncherType.BASIC else {
+        try {
+            LauncherType.valueOf(launcherTypeStr)
+        } catch (x: IllegalArgumentException) {
+            // set default value; actual check and error handling of invalid option is handled in the AstChecker later
+            LauncherType.BASIC
+        }
     }
 
     return CompilationOptions(
-        if (outputType == null) OutputType.PRG else OutputType.valueOf(outputType),
-        if (launcherType == null) LauncherType.BASIC else LauncherType.valueOf(launcherType),
+        outputType,
+        launcherType,
         zpType, zpReserved, floatsEnabled, noSysInit,
         compTarget
     )
@@ -253,6 +279,11 @@ private fun processAst(programAst: Program, errors: IErrorReporter, compilerOpti
     println("Processing for target ${compilerOptions.compTarget.name}...")
     programAst.checkIdentifiers(errors, compilerOptions)
     errors.report()
+    // TODO: turning char literals into UBYTEs via an encoding should really happen in code gen - but for that we'd need DataType.CHAR
+    // NOTE: we will then lose the opportunity to do constant-folding on any expression containing a char literal, but how often will those occur?
+    // Also they might be optimized away eventually in codegen or by the assembler even
+    programAst.charLiteralsToUByteLiterals(errors, compilerOptions.compTarget)
+    errors.report()
     programAst.constantFold(errors, compilerOptions.compTarget)
     errors.report()
     programAst.reorderStatements(errors)
@@ -286,17 +317,6 @@ private fun optimizeAst(programAst: Program, errors: IErrorReporter, functions:
             break
     }
 
-    val inliner = SubroutineInliner(programAst, errors, options)
-    inliner.visit(programAst)
-    errors.report()
-    if(errors.noErrors()) {
-        inliner.applyModifications()
-        inliner.fixCallsToInlinedSubroutines()
-        val remover2 = UnusedCodeRemover(programAst, errors, compTarget)
-        remover2.visit(programAst)
-        remover2.applyModifications()
-    }
-
     errors.report()
 }
 
@@ -313,10 +333,15 @@ private fun postprocessAst(programAst: Program, errors: IErrorReporter, compiler
     programAst.moveMainAndStartToFirst()
 }
 
+private sealed class WriteAssemblyResult {
+    class Ok(val filename: String): WriteAssemblyResult()
+    class Fail(val error: String): WriteAssemblyResult()
+}
+
 private fun writeAssembly(programAst: Program,
                           errors: IErrorReporter,
                           outputDir: Path,
-                          compilerOptions: CompilationOptions): String {
+                          compilerOptions: CompilationOptions): WriteAssemblyResult {
     // asm generation directly from the Ast
     programAst.processAstBeforeAsmGeneration(errors, compilerOptions.compTarget)
     errors.report()
@@ -330,9 +355,19 @@ private fun writeAssembly(programAst: Program,
             compilerOptions.compTarget.machine.zeropage,
             compilerOptions,
             outputDir).compileToAssembly()
-    assembly.assemble(compilerOptions)
-    errors.report()
-    return assembly.name
+
+    return if(assembly.valid && errors.noErrors()) {
+        val assemblerReturnStatus = assembly.assemble(compilerOptions)
+        if(assemblerReturnStatus!=0)
+            WriteAssemblyResult.Fail("assembler step failed with return code $assemblerReturnStatus")
+        else {
+            errors.report()
+            WriteAssemblyResult.Ok(assembly.name)
+        }
+    } else {
+        errors.report()
+        WriteAssemblyResult.Fail("compiler failed with errors")
+    }
 }
 
 fun printAst(programAst: Program) {
@@ -342,21 +377,19 @@ fun printAst(programAst: Program) {
     println()
 }
 
-fun loadAsmIncludeFile(filename: String, source: Path): String {
-    return if (filename.startsWith("library:")) {
-        val resource = tryGetEmbeddedResource(filename.substring(8))
-            ?: throw IllegalArgumentException("library file '$filename' not found")
-        resource.bufferedReader().use { it.readText() }
+internal fun loadAsmIncludeFile(filename: String, source: SourceCode): Result<String, NoSuchFileException> {
+    return if (filename.startsWith(libraryFilePrefix)) {
+        return runCatching {
+            val stream = object {}.javaClass.getResourceAsStream("/prog8lib/${filename.substring(libraryFilePrefix.length)}") // TODO handle via SourceCode
+            stream!!.bufferedReader().use { r -> r.readText() }
+        }.mapError { NoSuchFileException(File(filename)) }
     } else {
         // first try in the isSameAs folder as where the containing file was imported from
-        val sib = source.resolveSibling(filename)
+        val sib = Path(source.origin).resolveSibling(filename)
+
         if (sib.toFile().isFile)
-            sib.toFile().readText()
+            Ok(sib.toFile().readText())
         else
-            File(filename).readText()
+            Ok(File(filename).readText())
     }
 }
-
-internal fun tryGetEmbeddedResource(name: String): InputStream? {
-    return object{}.javaClass.getResourceAsStream("/prog8lib/$name")
-}

compiler/src/prog8/compiler/IStringEncoding.kt

@@ -0,0 +1,6 @@
+package prog8.compiler
+
+interface IStringEncoding {
+    fun encodeString(str: String, altEncoding: Boolean): List<Short>
+    fun decodeString(bytes: List<Short>, altEncoding: Boolean): String
+}

compiler/src/prog8/compiler/ModuleImporter.kt

@@ -0,0 +1,159 @@
+package prog8.compiler
+
+import com.github.michaelbull.result.*
+import prog8.ast.Module
+import prog8.ast.Program
+import prog8.ast.base.Position
+import prog8.ast.base.SyntaxError
+import prog8.ast.statements.Directive
+import prog8.ast.statements.DirectiveArg
+import prog8.parser.Prog8Parser
+import prog8.parser.SourceCode
+import java.io.File
+import java.nio.file.Path
+import kotlin.io.path.*
+
+
+class ModuleImporter(private val program: Program,
+                     private val compilationTargetName: String,
+                     val errors: IErrorReporter,
+                     sourceDirs: List<String>) {
+
+    private val sourcePaths: List<Path> = sourceDirs.map { Path(it) }
+
+    fun importModule(filePath: Path): Result<Module, NoSuchFileException> {
+        val currentDir = Path("").absolute()
+        val searchIn = listOf(currentDir) + sourcePaths
+        val candidates = searchIn
+            .map { it.absolute().div(filePath).normalize().absolute() }
+            .filter { it.exists() }
+            .map { currentDir.relativize(it) }
+            .map { if (it.isAbsolute) it else Path(".", "$it") }
+
+        val srcPath = when (candidates.size) {
+            0 -> return Err(NoSuchFileException(
+                    file = filePath.normalize().toFile(),
+                    reason = "searched in $searchIn"))
+            1 -> candidates.first()
+            else -> candidates.first()  // when more candiates, pick the one from the first location
+        }
+
+        val logMsg = "importing '${filePath.nameWithoutExtension}' (from file $srcPath)"
+        println(logMsg)
+
+        val module = importModule(SourceCode.File(srcPath))
+        return if(module==null)
+            Err(NoSuchFileException(srcPath.toFile()))
+        else
+            Ok(module)
+    }
+
+    fun importLibraryModule(name: String): Module? {
+        val import = Directive("%import", listOf(
+                DirectiveArg("", name, 42, position = Position("<<<implicit-import>>>", 0, 0, 0))
+        ), Position("<<<implicit-import>>>", 0, 0, 0))
+        return executeImportDirective(import, null)
+    }
+
+    private fun importModule(src: SourceCode) : Module? {
+        val moduleAst = Prog8Parser.parseModule(src)
+        program.addModule(moduleAst)
+
+        // accept additional imports
+        try {
+            val lines = moduleAst.statements.toMutableList()
+            lines.asSequence()
+                .mapIndexed { i, it -> i to it }
+                .filter { (it.second as? Directive)?.directive == "%import" }
+                .forEach { executeImportDirective(it.second as Directive, moduleAst) }
+            moduleAst.statements = lines
+            return moduleAst
+        } catch (x: Exception) {
+            // in case of error, make sure the module we're importing is no longer in the Ast
+            program.removeModule(moduleAst)
+            throw x
+        }
+    }
+
+    private fun executeImportDirective(import: Directive, importingModule: Module?): Module? {
+        if(import.directive!="%import" || import.args.size!=1)
+            throw SyntaxError("invalid import directive", import.position)
+        if(!import.args[0].str.isNullOrEmpty() || import.args[0].name==null)
+            throw SyntaxError("%import requires unquoted module name", import.position)
+        val moduleName = import.args[0].name!!
+        if("$moduleName.p8" == import.position.file)
+            throw SyntaxError("cannot import self", import.position)
+
+        val existing = program.modules.singleOrNull { it.name == moduleName }
+        if (existing!=null)
+            return existing
+
+        // try internal library first
+        val moduleResourceSrc = getModuleFromResource("$moduleName.p8", compilationTargetName)
+        val importedModule =
+            moduleResourceSrc.fold(
+                success = {
+                    println("importing '$moduleName' (from internal ${it.origin})")
+                    importModule(it)
+                },
+                failure = {
+                    // try filesystem next
+                    val moduleSrc = getModuleFromFile(moduleName, importingModule)
+                    moduleSrc.fold(
+                        success = {
+                            println("importing '$moduleName' (from file ${it.origin})")
+                            importModule(it)
+                        },
+                        failure = {
+                            errors.err("no module found with name $moduleName", import.position)
+                            return null
+                        }
+                    )
+                }
+            )
+
+        if(importedModule!=null)
+            removeDirectivesFromImportedModule(importedModule)
+        return importedModule
+    }
+
+    private fun removeDirectivesFromImportedModule(importedModule: Module) {
+        // Most global directives don't apply for imported modules, so remove them
+        val moduleLevelDirectives = listOf("%output", "%launcher", "%zeropage", "%zpreserved", "%address")
+        var directives = importedModule.statements.filterIsInstance<Directive>()
+        importedModule.statements.removeAll(directives)
+        directives = directives.filter{ it.directive !in moduleLevelDirectives }
+        importedModule.statements.addAll(0, directives)
+    }
+
+    private fun getModuleFromResource(name: String, compilationTargetName: String): Result<SourceCode, NoSuchFileException> {
+        val result =
+            runCatching { SourceCode.Resource("/prog8lib/$compilationTargetName/$name") }
+            .orElse { runCatching { SourceCode.Resource("/prog8lib/$name") }  }
+
+        return result.mapError { NoSuchFileException(File(name)) }
+    }
+
+    private fun getModuleFromFile(name: String, importingModule: Module?): Result<SourceCode, NoSuchFileException> {
+        val fileName = "$name.p8"
+        val locations =
+            if (importingModule == null) { // <=> imported from library module
+                sourcePaths
+            } else {
+                val dropCurDir = if(sourcePaths.isNotEmpty() && sourcePaths[0].name == ".") 1 else 0
+                sourcePaths.drop(dropCurDir) +
+                // TODO: won't work until Prog8Parser is fixed s.t. it fully initializes the modules it returns. // hm, what won't work?)
+                listOf(Path(importingModule.position.file).parent ?: Path("")) +
+                listOf(Path(".", "prog8lib"))
+            }
+
+        locations.forEach {
+            try {
+                return Ok(SourceCode.File(it.resolve(fileName)))
+            } catch (e: NoSuchFileException) {
+            }
+        }
+
+        return Err(NoSuchFileException(File("name")))
+    }
+}

compiler/src/prog8/compiler/astprocessing/AstChecker.kt

@@ -12,12 +12,11 @@ import prog8.compiler.IErrorReporter
 import prog8.compiler.ZeropageType
 import prog8.compiler.functions.BuiltinFunctions
 import prog8.compiler.functions.builtinFunctionReturnType
-import prog8.compiler.target.C64Target
-import prog8.compiler.target.Cx16Target
 import prog8.compiler.target.ICompilationTarget
 import java.io.CharConversionException
 import java.io.File
 import java.util.*
+import kotlin.io.path.*
 
 internal class AstChecker(private val program: Program,
                           private val compilerOptions: CompilationOptions,
@@ -45,8 +44,8 @@ internal class AstChecker(private val program: Program,
         }
 
         if(compilerOptions.floats) {
-            if (compilerOptions.zeropage !in setOf(ZeropageType.FLOATSAFE, ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
-                errors.err("when floats are enabled, zero page type should be 'floatsafe' or 'basicsafe' or 'dontuse'", program.mainModule.position)
+            if (compilerOptions.zeropage !in arrayOf(ZeropageType.FLOATSAFE, ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
+                errors.err("when floats are enabled, zero page type should be 'floatsafe' or 'basicsafe' or 'dontuse'", program.toplevelModule.position)
         }
 
         super.visit(program)
@@ -64,7 +63,7 @@ internal class AstChecker(private val program: Program,
     }
 
     override fun visit(returnStmt: Return) {
-        val expectedReturnValues = returnStmt.definingSubroutine()?.returntypes ?: emptyList()
+        val expectedReturnValues = returnStmt.definingSubroutine?.returntypes ?: emptyList()
         if(expectedReturnValues.size>1) {
             throw FatalAstException("cannot use a return with one value in a subroutine that has multiple return values: $returnStmt")
         }
@@ -80,7 +79,7 @@ internal class AstChecker(private val program: Program,
             if(!valueDt.isKnown) {
                 errors.err("return value type mismatch or unknown symbol", returnStmt.value!!.position)
             } else {
-                if (expectedReturnValues[0] != valueDt.typeOrElse(DataType.UNDEFINED))
+                if (expectedReturnValues[0] != valueDt.getOr(DataType.UNDEFINED))
                     errors.err("type $valueDt of return value doesn't match subroutine's return type ${expectedReturnValues[0]}", returnStmt.value!!.position)
             }
         }
@@ -88,7 +87,7 @@ internal class AstChecker(private val program: Program,
     }
 
     override fun visit(ifStatement: IfStatement) {
-        if(!ifStatement.condition.inferType(program).isInteger())
+        if(!ifStatement.condition.inferType(program).isInteger)
             errors.err("condition value should be an integer type", ifStatement.condition.position)
         super.visit(ifStatement)
     }
@@ -106,7 +105,7 @@ internal class AstChecker(private val program: Program,
             }
         }
 
-        val iterableDt = forLoop.iterable.inferType(program).typeOrElse(DataType.BYTE)
+        val iterableDt = forLoop.iterable.inferType(program).getOr(DataType.BYTE)
         if(iterableDt !in IterableDatatypes && forLoop.iterable !is RangeExpr) {
             errors.err("can only loop over an iterable type", forLoop.position)
         } else {
@@ -138,6 +137,9 @@ internal class AstChecker(private val program: Program,
                             errors.err("word loop variable can only loop over bytes or words", forLoop.position)
                     }
                     DataType.FLOAT -> {
+                        // Looping over float variables is very inefficient because the loopvar is going to
+                        // get copied over with new values all the time. We don't support this for now.
+                        // Loop with an integer index variable if you really need to... or write different code.
                         errors.err("for loop only supports integers", forLoop.position)
                     }
                     else -> errors.err("loop variable must be numeric type", forLoop.position)
@@ -150,11 +152,11 @@ internal class AstChecker(private val program: Program,
                         val to = range.to as? NumericLiteralValue
                         if(from != null)
                             checkValueTypeAndRange(loopvar.datatype, from)
-                        else if(!range.from.inferType(program).istype(loopvar.datatype))
+                        else if(range.from.inferType(program) isnot loopvar.datatype)
                             errors.err("range start value is incompatible with loop variable type", range.position)
                         if(to != null)
                             checkValueTypeAndRange(loopvar.datatype, to)
-                        else if(!range.to.inferType(program).istype(loopvar.datatype))
+                        else if(range.to.inferType(program) isnot loopvar.datatype)
                             errors.err("range end value is incompatible with loop variable type", range.position)
                     }
                 }
@@ -269,10 +271,11 @@ internal class AstChecker(private val program: Program,
             }
         }
 
-        // scope check
-        if(subroutine.parent !is Block && subroutine.parent !is Subroutine) {
+        if(subroutine.inline && !subroutine.isAsmSubroutine)
+            err("subroutine inlining is currently only supported on asmsub routines")
+
+        if(subroutine.parent !is Block && subroutine.parent !is Subroutine)
             err("subroutines can only be defined in the scope of a block or within another subroutine")
-        }
 
         if(subroutine.isAsmSubroutine) {
             if(subroutine.asmParameterRegisters.size != subroutine.parameters.size)
@@ -280,11 +283,11 @@ internal class AstChecker(private val program: Program,
             if(subroutine.asmReturnvaluesRegisters.size != subroutine.returntypes.size)
                 err("number of return registers is not the isSameAs as number of return values")
             for(param in subroutine.parameters.zip(subroutine.asmParameterRegisters)) {
-                if(param.second.registerOrPair in setOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
+                if(param.second.registerOrPair in arrayOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
                     if (param.first.type != DataType.UBYTE && param.first.type != DataType.BYTE)
                         err("parameter '${param.first.name}' should be (u)byte")
                 }
-                else if(param.second.registerOrPair in setOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
+                else if(param.second.registerOrPair in arrayOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
                     if (param.first.type != DataType.UWORD && param.first.type != DataType.WORD
                             && param.first.type != DataType.STR && param.first.type !in ArrayDatatypes && param.first.type != DataType.FLOAT)
                         err("parameter '${param.first.name}' should be (u)word/address")
@@ -295,11 +298,11 @@ internal class AstChecker(private val program: Program,
                 }
             }
             subroutine.returntypes.zip(subroutine.asmReturnvaluesRegisters).forEachIndexed { index, pair ->
-                if(pair.second.registerOrPair in setOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
+                if(pair.second.registerOrPair in arrayOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
                     if (pair.first != DataType.UBYTE && pair.first != DataType.BYTE)
                         err("return value #${index + 1} should be (u)byte")
                 }
-                else if(pair.second.registerOrPair in setOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
+                else if(pair.second.registerOrPair in arrayOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
                     if (pair.first != DataType.UWORD && pair.first != DataType.WORD
                             && pair.first != DataType.STR && pair.first !in ArrayDatatypes && pair.first != DataType.FLOAT)
                         err("return value #${index + 1} should be (u)word/address")
@@ -388,13 +391,13 @@ internal class AstChecker(private val program: Program,
     }
 
     override fun visit(untilLoop: UntilLoop) {
-        if(!untilLoop.condition.inferType(program).isInteger())
+        if(!untilLoop.condition.inferType(program).isInteger)
             errors.err("condition value should be an integer type", untilLoop.condition.position)
         super.visit(untilLoop)
     }
 
     override fun visit(whileLoop: WhileLoop) {
-        if(!whileLoop.condition.inferType(program).isInteger())
+        if(!whileLoop.condition.inferType(program).isInteger)
             errors.err("condition value should be an integer type", whileLoop.condition.position)
         super.visit(whileLoop)
     }
@@ -414,7 +417,7 @@ internal class AstChecker(private val program: Program,
                 if(!idt.isKnown) {
                      errors.err("return type mismatch", assignment.value.position)
                 }
-                if(stmt.returntypes.isEmpty() || (stmt.returntypes.size == 1 && stmt.returntypes.single() isNotAssignableTo idt.typeOrElse(DataType.BYTE))) {
+                if(stmt.returntypes.isEmpty() || (stmt.returntypes.size == 1 && stmt.returntypes.single() isNotAssignableTo idt.getOr(DataType.BYTE))) {
                     errors.err("return type mismatch", assignment.value.position)
                 }
             }
@@ -423,14 +426,14 @@ internal class AstChecker(private val program: Program,
         val targetDt = assignment.target.inferType(program)
         val valueDt = assignment.value.inferType(program)
         if(valueDt.isKnown && !(valueDt isAssignableTo targetDt)) {
-            if(targetDt.isIterable())
+            if(targetDt.isIterable)
                 errors.err("cannot assign value to string or array", assignment.value.position)
-            else if(!(valueDt.istype(DataType.STR) && targetDt.istype(DataType.UWORD)))
+            else if(!(valueDt istype DataType.STR && targetDt istype DataType.UWORD))
                 errors.err("type of value doesn't match target", assignment.value.position)
         }
 
         if(assignment.value is TypecastExpression) {
-            if(assignment.isAugmentable && targetDt.istype(DataType.FLOAT))
+            if(assignment.isAugmentable && targetDt istype DataType.FLOAT)
                 errors.err("typecasting a float value in-place makes no sense", assignment.value.position)
         }
 
@@ -479,15 +482,15 @@ internal class AstChecker(private val program: Program,
             if (targetDatatype.isKnown) {
                 val constVal = assignment.value.constValue(program)
                 if (constVal != null) {
-                    checkValueTypeAndRange(targetDatatype.typeOrElse(DataType.BYTE), constVal)
+                    checkValueTypeAndRange(targetDatatype.getOr(DataType.BYTE), constVal)
                 } else {
                     val sourceDatatype = assignment.value.inferType(program)
                     if (sourceDatatype.isUnknown) {
                         if (assignment.value !is FunctionCall)
                             errors.err("assignment value is invalid or has no proper datatype", assignment.value.position)
                     } else {
-                        checkAssignmentCompatible(targetDatatype.typeOrElse(DataType.BYTE), assignTarget,
-                                sourceDatatype.typeOrElse(DataType.BYTE), assignment.value, assignment.position)
+                        checkAssignmentCompatible(targetDatatype.getOr(DataType.BYTE), assignTarget,
+                                sourceDatatype.getOr(DataType.BYTE), assignment.value, assignment.position)
                     }
                 }
             }
@@ -515,7 +518,7 @@ internal class AstChecker(private val program: Program,
         }
 
         // FLOATS enabled?
-        if(!compilerOptions.floats && decl.datatype in setOf(DataType.FLOAT, DataType.ARRAY_F) && decl.type!= VarDeclType.MEMORY)
+        if(!compilerOptions.floats && decl.datatype.oneOf(DataType.FLOAT, DataType.ARRAY_F) && decl.type!= VarDeclType.MEMORY)
             err("floating point used, but that is not enabled via options")
 
         if(decl.datatype == DataType.FLOAT && (decl.zeropage==ZeropageWish.REQUIRE_ZEROPAGE || decl.zeropage==ZeropageWish.PREFER_ZEROPAGE))
@@ -593,7 +596,7 @@ internal class AstChecker(private val program: Program,
 
         val declValue = decl.value
         if(declValue!=null && decl.type==VarDeclType.VAR) {
-            if (!declValue.inferType(program).istype(decl.datatype)) {
+            if (declValue.inferType(program) isnot decl.datatype) {
                 err("initialisation value has incompatible type (${declValue.inferType(program)}) for the variable (${decl.datatype})", declValue.position)
             }
         }
@@ -711,37 +714,37 @@ internal class AstChecker(private val program: Program,
                     err("this directive may only occur in a block or at module level")
                 if(directive.args.isEmpty())
                     err("missing option directive argument(s)")
-                else if(directive.args.map{it.name in setOf("enable_floats", "force_output", "no_sysinit", "align_word", "align_page")}.any { !it })
+                else if(directive.args.map{it.name in arrayOf("enable_floats", "force_output", "no_sysinit", "align_word", "align_page")}.any { !it })
                     err("invalid option directive argument(s)")
             }
-            "%target" -> {
-                if(directive.parent !is Block && directive.parent !is Module)
-                    err("this directive may only occur in a block or at module level")
-                if(directive.args.size != 1)
-                    err("directive requires one argument")
-                if(directive.args.single().name !in setOf(C64Target.name, Cx16Target.name))
-                    err("invalid compilation target")
-            }
             else -> throw SyntaxError("invalid directive ${directive.directive}", directive.position)
         }
         super.visit(directive)
     }
 
     private fun checkFileExists(directive: Directive, filename: String) {
-        var definingModule = directive.parent
-        while (definingModule !is Module)
-            definingModule = definingModule.parent
-        if (!(filename.startsWith("library:") || definingModule.source.resolveSibling(filename).toFile().isFile || File(filename).isFile))
+        if (File(filename).isFile)
+            return
+
+        val definingModule = directive.definingModule
+        if (definingModule.isLibrary || !definingModule.source.isFromFilesystem)
+            return
+
+        val s = definingModule.source.origin
+        val sourceFileCandidate = Path(s).resolveSibling(filename).toFile()
+        if (sourceFileCandidate.isFile)
+            return
+        else
             errors.err("included file not found: $filename", directive.position)
     }
 
     override fun visit(array: ArrayLiteralValue) {
         if(array.type.isKnown) {
-            if (!compilerOptions.floats && array.type.typeOrElse(DataType.UNDEFINED) in setOf(DataType.FLOAT, DataType.ARRAY_F)) {
+            if (!compilerOptions.floats && array.type.oneOf(DataType.FLOAT, DataType.ARRAY_F)) {
                 errors.err("floating point used, but that is not enabled via options", array.position)
             }
             val arrayspec = ArrayIndex.forArray(array)
-            checkValueTypeAndRangeArray(array.type.typeOrElse(DataType.UNDEFINED), arrayspec, array)
+            checkValueTypeAndRangeArray(array.type.getOr(DataType.UNDEFINED), arrayspec, array)
         }
 
         fun isPassByReferenceElement(e: Expression): Boolean {
@@ -763,10 +766,20 @@ internal class AstChecker(private val program: Program,
         super.visit(array)
     }
 
+    override fun visit(char: CharLiteral) {
+        try {  // just *try* if it can be encoded, don't actually do it
+            compTarget.encodeString(char.value.toString(), char.altEncoding)
+        } catch (cx: CharConversionException) {
+            errors.err(cx.message ?: "can't encode character", char.position)
+        }
+
+        super.visit(char)
+    }
+
     override fun visit(string: StringLiteralValue) {
         checkValueTypeAndRangeString(DataType.STR, string)
 
-        try {
+        try {  // just *try* if it can be encoded, don't actually do it
             compTarget.encodeString(string.value, string.altEncoding)
         } catch (cx: CharConversionException) {
             errors.err(cx.message ?: "can't encode string", string.position)
@@ -780,7 +793,7 @@ internal class AstChecker(private val program: Program,
         if(!idt.isKnown)
             return  // any error should be reported elsewhere
 
-        val dt = idt.typeOrElse(DataType.UNDEFINED)
+        val dt = idt.getOr(DataType.UNDEFINED)
         if(expr.operator=="-") {
             if (dt != DataType.BYTE && dt != DataType.WORD && dt != DataType.FLOAT) {
                 errors.err("can only take negative of a signed number type", expr.position)
@@ -805,8 +818,8 @@ internal class AstChecker(private val program: Program,
         if(!leftIDt.isKnown || !rightIDt.isKnown)
             return     // hopefully this error will be detected elsewhere
 
-        val leftDt = leftIDt.typeOrElse(DataType.UNDEFINED)
-        val rightDt = rightIDt.typeOrElse(DataType.UNDEFINED)
+        val leftDt = leftIDt.getOr(DataType.UNDEFINED)
+        val rightDt = rightIDt.getOr(DataType.UNDEFINED)
 
         when(expr.operator){
             "/", "%" -> {
@@ -902,7 +915,7 @@ internal class AstChecker(private val program: Program,
         // warn about sgn(unsigned) this is likely a mistake
         if(functionCall.target.nameInSource.last()=="sgn") {
             val sgnArgType = functionCall.args.first().inferType(program)
-            if(sgnArgType.istype(DataType.UBYTE) || sgnArgType.istype(DataType.UWORD))
+            if(sgnArgType istype DataType.UBYTE  || sgnArgType istype DataType.UWORD)
                 errors.warn("sgn() of unsigned type is always 0 or 1, this is perhaps not what was intended", functionCall.args.first().position)
         }
 
@@ -971,12 +984,12 @@ internal class AstChecker(private val program: Program,
         if(functionCallStatement.target.nameInSource.last() == "sort") {
             // sort is not supported on float arrays
             val idref = functionCallStatement.args.singleOrNull() as? IdentifierReference
-            if(idref!=null && idref.inferType(program).istype(DataType.ARRAY_F)) {
+            if(idref!=null && idref.inferType(program) istype DataType.ARRAY_F) {
                 errors.err("sorting a floating point array is not supported", functionCallStatement.args.first().position)
             }
         }
 
-        if(functionCallStatement.target.nameInSource.last() in setOf("rol", "ror", "rol2", "ror2", "swap", "sort", "reverse")) {
+        if(functionCallStatement.target.nameInSource.last() in arrayOf("rol", "ror", "rol2", "ror2", "swap", "sort", "reverse")) {
             // in-place modification, can't be done on literals
             if(functionCallStatement.args.any { it !is IdentifierReference && it !is ArrayIndexedExpression && it !is DirectMemoryRead }) {
                 errors.err("invalid argument to a in-place modifying function", functionCallStatement.args.first().position)
@@ -998,7 +1011,7 @@ internal class AstChecker(private val program: Program,
 
         if(target is BuiltinFunctionStatementPlaceholder) {
             if(target.name=="swap") {
-                // swap() is a bit weird because this one is translated into a operations directly, instead of being a function call
+                // swap() is a bit weird because this one is translated into an operations directly, instead of being a function call
                 val dt1 = args[0].inferType(program)
                 val dt2 = args[1].inferType(program)
                 if (dt1 != dt2)
@@ -1007,14 +1020,14 @@ internal class AstChecker(private val program: Program,
                     errors.err("swap requires 2 variables, not constant value(s)", position)
                 else if(args[0] isSameAs args[1])
                     errors.err("swap should have 2 different args", position)
-                else if(!dt1.isNumeric())
+                else if(!dt1.isNumeric)
                     errors.err("swap requires args of numerical type", position)
             }
             else if(target.name=="all" || target.name=="any") {
                 if((args[0] as? AddressOf)?.identifier?.targetVarDecl(program)?.datatype == DataType.STR) {
                     errors.err("any/all on a string is useless (is always true unless the string is empty)", position)
                 }
-                if(args[0].inferType(program).typeOrElse(DataType.STR) == DataType.STR) {
+                if(args[0].inferType(program).getOr(DataType.STR) == DataType.STR) {
                     errors.err("any/all on a string is useless (is always true unless the string is empty)", position)
                 }
             }
@@ -1105,14 +1118,14 @@ internal class AstChecker(private val program: Program,
 
         // check index value 0..255
         val dtxNum = arrayIndexedExpression.indexer.indexExpr.inferType(program)
-        if(!dtxNum.istype(DataType.UBYTE) && !dtxNum.istype(DataType.BYTE))
+        if(dtxNum isnot DataType.UBYTE && dtxNum isnot DataType.BYTE)
             errors.err("array indexing is limited to byte size 0..255", arrayIndexedExpression.position)
 
         super.visit(arrayIndexedExpression)
     }
 
     override fun visit(whenStatement: WhenStatement) {
-        if(!whenStatement.condition.inferType(program).isInteger())
+        if(!whenStatement.condition.inferType(program).isInteger)
             errors.err("when condition must be an integer value", whenStatement.position)
         val tally = mutableSetOf<Int>()
         for((choices, choiceNode) in whenStatement.choiceValues(program)) {
@@ -1143,7 +1156,7 @@ internal class AstChecker(private val program: Program,
                 when {
                     constvalue == null -> errors.err("choice value must be a constant", whenChoice.position)
                     constvalue.type !in IntegerDatatypes -> errors.err("choice value must be a byte or word", whenChoice.position)
-                    constvalue.type != conditionType.typeOrElse(DataType.UNDEFINED) -> errors.err("choice value datatype differs from condition value", whenChoice.position)
+                    conditionType isnot constvalue.type -> errors.err("choice value datatype differs from condition value", whenChoice.position)
                 }
             }
         } else {
@@ -1154,13 +1167,11 @@ internal class AstChecker(private val program: Program,
     }
 
     private fun checkFunctionOrLabelExists(target: IdentifierReference, statement: Statement): Statement? {
-        val targetStatement = target.targetStatement(program)
-        if(targetStatement is Label || targetStatement is Subroutine || targetStatement is BuiltinFunctionStatementPlaceholder)
-            return targetStatement
-        else if(targetStatement==null)
-            errors.err("undefined function or subroutine: ${target.nameInSource.joinToString(".")}", statement.position)
-        else
-            errors.err("cannot call that: ${target.nameInSource.joinToString(".")}", statement.position)
+        when (val targetStatement = target.targetStatement(program)) {
+            is Label, is Subroutine, is BuiltinFunctionStatementPlaceholder -> return targetStatement
+            null -> errors.err("undefined function or subroutine: ${target.nameInSource.joinToString(".")}", statement.position)
+            else -> errors.err("cannot call that: ${target.nameInSource.joinToString(".")}", statement.position)
+        }
         return null
     }
 
@@ -1189,7 +1200,7 @@ internal class AstChecker(private val program: Program,
             DataType.STR -> return err("string value expected")
             DataType.ARRAY_UB, DataType.ARRAY_B -> {
                 // value may be either a single byte, or a byte arraysize (of all constant values), or a range
-                if(value.type.istype(targetDt)) {
+                if(value.type istype targetDt) {
                     if(!checkArrayValues(value, targetDt))
                         return false
                     val arraySpecSize = arrayspec.constIndex()
@@ -1208,7 +1219,7 @@ internal class AstChecker(private val program: Program,
             }
             DataType.ARRAY_UW, DataType.ARRAY_W -> {
                 // value may be either a single word, or a word arraysize, or a range
-                if(value.type.istype(targetDt)) {
+                if(value.type istype targetDt) {
                     if(!checkArrayValues(value, targetDt))
                         return false
                     val arraySpecSize = arrayspec.constIndex()
@@ -1227,7 +1238,7 @@ internal class AstChecker(private val program: Program,
             }
             DataType.ARRAY_F -> {
                 // value may be either a single float, or a float arraysize
-                if(value.type.istype(targetDt)) {
+                if(value.type istype targetDt) {
                     if(!checkArrayValues(value, targetDt))
                         return false
                     val arraySize = value.value.size

compiler/src/prog8/compiler/astprocessing/AstExtensions.kt

@@ -1,12 +1,67 @@
 package prog8.compiler.astprocessing
 
+import prog8.ast.Node
 import prog8.ast.Program
-import prog8.ast.base.FatalAstException
+import prog8.ast.base.DataType
+import prog8.ast.base.VarDeclType
+import prog8.ast.expressions.*
+import prog8.ast.statements.AssignTarget
 import prog8.ast.statements.Directive
+import prog8.ast.walk.AstWalker
+import prog8.ast.walk.IAstModification
 import prog8.compiler.BeforeAsmGenerationAstChanger
 import prog8.compiler.CompilationOptions
 import prog8.compiler.IErrorReporter
+import prog8.compiler.IStringEncoding
 import prog8.compiler.target.ICompilationTarget
+import prog8.compiler.target.IMachineDefinition
+import kotlin.math.abs
+
+
+fun RangeExpr.size(encoding: IStringEncoding): Int? {
+    val fromLv = (from as? NumericLiteralValue)
+    val toLv = (to as? NumericLiteralValue)
+    if(fromLv==null || toLv==null)
+        return null
+    return toConstantIntegerRange(encoding)?.count()
+}
+
+fun RangeExpr.toConstantIntegerRange(encoding: IStringEncoding): IntProgression? {
+    val fromVal: Int
+    val toVal: Int
+    val fromString = from as? StringLiteralValue
+    val toString = to as? StringLiteralValue
+    if(fromString!=null && toString!=null ) {
+        // string range -> int range over character values
+        fromVal = encoding.encodeString(fromString.value, fromString.altEncoding)[0].toInt()
+        toVal = encoding.encodeString(toString.value, fromString.altEncoding)[0].toInt()
+    } else {
+        val fromLv = from as? NumericLiteralValue
+        val toLv = to as? NumericLiteralValue
+        if(fromLv==null || toLv==null)
+            return null         // non-constant range
+        // integer range
+        fromVal = fromLv.number.toInt()
+        toVal = toLv.number.toInt()
+    }
+    val stepVal = (step as? NumericLiteralValue)?.number?.toInt() ?: 1
+    return makeRange(fromVal, toVal, stepVal)
+}
+
+private fun makeRange(fromVal: Int, toVal: Int, stepVal: Int): IntProgression {
+    return when {
+        fromVal <= toVal -> when {
+            stepVal <= 0 -> IntRange.EMPTY
+            stepVal == 1 -> fromVal..toVal
+            else -> fromVal..toVal step stepVal
+        }
+        else -> when {
+            stepVal >= 0 -> IntRange.EMPTY
+            stepVal == -1 -> fromVal downTo toVal
+            else -> fromVal downTo toVal step abs(stepVal)
+        }
+    }
+}
 
 
 internal fun Program.checkValid(compilerOptions: CompilationOptions, errors: IErrorReporter, compTarget: ICompilationTarget) {
@@ -33,6 +88,20 @@ internal fun Program.reorderStatements(errors: IErrorReporter) {
     }
 }
 
+internal fun Program.charLiteralsToUByteLiterals(errors: IErrorReporter, enc: IStringEncoding) {
+    val walker = object : AstWalker() {
+        override fun after(char: CharLiteral, parent: Node): Iterable<IAstModification> {
+            return listOf(IAstModification.ReplaceNode(
+                char,
+                NumericLiteralValue(DataType.UBYTE, enc.encodeString(char.value.toString(), char.altEncoding)[0].toInt(), char.position),
+                parent
+            ))
+        }
+    }
+    walker.visit(this)
+    walker.applyModifications()
+}
+
 internal fun Program.addTypecasts(errors: IErrorReporter) {
     val caster = TypecastsAdder(this, errors)
     caster.visit(this)
@@ -57,10 +126,6 @@ internal fun Program.checkIdentifiers(errors: IErrorReporter, options: Compilati
         lit2decl.visit(this)
         lit2decl.applyModifications()
     }
-
-    if (modules.map { it.name }.toSet().size != modules.size) {
-        throw FatalAstException("modules should all be unique")
-    }
 }
 
 internal fun Program.variousCleanups(program: Program, errors: IErrorReporter) {
@@ -77,12 +142,10 @@ internal fun Program.moveMainAndStartToFirst() {
     // and finally the entrypoint subroutine "start" itself is moved to the top in that block.
 
     val directives = modules[0].statements.filterIsInstance<Directive>()
-    val start = this.entrypoint()
-    val mod = start.definingModule()
-    val block = start.definingBlock()
-    if(!modules.remove(mod))
-        throw FatalAstException("module wrong")
-    modules.add(0, mod)
+    val start = this.entrypoint
+    val mod = start.definingModule
+    val block = start.definingBlock
+    moveModuleToFront(mod)
     mod.remove(block)
     var afterDirective = mod.statements.indexOfFirst { it !is Directive }
     if(afterDirective<0)
@@ -102,3 +165,47 @@ internal fun Program.moveMainAndStartToFirst() {
         modules[0].statements.add(0, directive)
     }
 }
+
+internal fun AssignTarget.isInRegularRAMof(machine: IMachineDefinition): Boolean {
+    val memAddr = memoryAddress
+    val arrayIdx = arrayindexed
+    val ident = identifier
+    when {
+        memAddr != null -> {
+            return when (memAddr.addressExpression) {
+                is NumericLiteralValue -> {
+                    machine.isRegularRAMaddress((memAddr.addressExpression as NumericLiteralValue).number.toInt())
+                }
+                is IdentifierReference -> {
+                    val program = definingModule.program
+                    val decl = (memAddr.addressExpression as IdentifierReference).targetVarDecl(program)
+                    if ((decl?.type == VarDeclType.VAR || decl?.type == VarDeclType.CONST) && decl.value is NumericLiteralValue)
+                        machine.isRegularRAMaddress((decl.value as NumericLiteralValue).number.toInt())
+                    else
+                        false
+                }
+                else -> false
+            }
+        }
+        arrayIdx != null -> {
+            val program = definingModule.program
+            val targetStmt = arrayIdx.arrayvar.targetVarDecl(program)
+            return if (targetStmt?.type == VarDeclType.MEMORY) {
+                val addr = targetStmt.value as? NumericLiteralValue
+                if (addr != null)
+                    machine.isRegularRAMaddress(addr.number.toInt())
+                else
+                    false
+            } else true
+        }
+        ident != null -> {
+            val program = definingModule.program
+            val decl = ident.targetVarDecl(program)!!
+            return if (decl.type == VarDeclType.MEMORY && decl.value is NumericLiteralValue)
+                machine.isRegularRAMaddress((decl.value as NumericLiteralValue).number.toInt())
+            else
+                true
+        }
+        else -> return true
+    }
+}

compiler/src/prog8/compiler/astprocessing/AstIdentifiersChecker.kt

@@ -1,6 +1,5 @@
 package prog8.compiler.astprocessing
 
-import prog8.ast.Module
 import prog8.ast.Program
 import prog8.ast.base.Position
 import prog8.ast.expressions.StringLiteralValue
@@ -17,42 +16,23 @@ internal class AstIdentifiersChecker(private val program: Program, private val e
         errors.err("name conflict '$name', also defined in ${existing.position.file} line ${existing.position.line}", position)
     }
 
-    override fun visit(module: Module) {
-        blocks.clear()  // blocks may be redefined within a different module
-
-        super.visit(module)
-    }
-
     override fun visit(block: Block) {
         if(block.name in compTarget.machine.opcodeNames)
             errors.err("can't use a cpu opcode name as a symbol: '${block.name}'", block.position)
 
         val existing = blocks[block.name]
-        if(existing!=null)
-            nameError(block.name, block.position, existing)
+        if(existing!=null) {
+            if(block.isInLibrary)
+                nameError(existing.name, existing.position, block)
+            else
+                nameError(block.name, block.position, existing)
+        }
         else
             blocks[block.name] = block
 
-        if(!block.isInLibrary) {
-            val libraries = program.modules.filter { it.isLibraryModule }
-            val libraryBlockNames = libraries.flatMap { it.statements.filterIsInstance<Block>().map { b -> b.name } }
-            if(block.name in libraryBlockNames)
-                errors.err("block is already defined in an included library module", block.position)
-        }
-
         super.visit(block)
     }
 
-    override fun visit(directive: Directive) {
-        if(directive.directive=="%target") {
-            val compatibleTarget = directive.args.single().name
-            if (compatibleTarget != compTarget.name)
-                errors.err("module's compilation target ($compatibleTarget) differs from active target (${compTarget.name})", directive.position)
-        }
-
-        super.visit(directive)
-    }
-
     override fun visit(decl: VarDecl) {
         decl.datatypeErrors.forEach { errors.err(it.message, it.position) }
 
@@ -66,10 +46,10 @@ internal class AstIdentifiersChecker(private val program: Program, private val e
         if (existing != null && existing !== decl)
             nameError(decl.name, decl.position, existing)
 
-        if(decl.definingBlock().name==decl.name)
-            nameError(decl.name, decl.position, decl.definingBlock())
-        if(decl.definingSubroutine()?.name==decl.name)
-            nameError(decl.name, decl.position, decl.definingSubroutine()!!)
+        if(decl.definingBlock.name==decl.name)
+            nameError(decl.name, decl.position, decl.definingBlock)
+        if(decl.definingSubroutine?.name==decl.name)
+            nameError(decl.name, decl.position, decl.definingSubroutine!!)
 
         super.visit(decl)
     }
@@ -90,7 +70,7 @@ internal class AstIdentifiersChecker(private val program: Program, private val e
                 nameError(subroutine.name, subroutine.position, existing)
 
             // check that there are no local variables, labels, or other subs that redefine the subroutine's parameters. Blocks are okay.
-            val symbolsInSub = subroutine.allDefinedSymbols()
+            val symbolsInSub = subroutine.allDefinedSymbols
             val namesInSub = symbolsInSub.map{ it.first }.toSet()
             val paramNames = subroutine.parameters.map { it.name }.toSet()
             val paramsToCheck = paramNames.intersect(namesInSub)
@@ -107,10 +87,10 @@ internal class AstIdentifiersChecker(private val program: Program, private val e
                 errors.err("asmsub can only contain inline assembly (%asm)", subroutine.position)
             }
 
-            if(subroutine.name == subroutine.definingBlock().name) {
+            if(subroutine.name == subroutine.definingBlock.name) {
                 // subroutines cannot have the same name as their enclosing block,
                 // because this causes symbol scoping issues in the resulting assembly source
-                nameError(subroutine.name, subroutine.position, subroutine.definingBlock())
+                nameError(subroutine.name, subroutine.position, subroutine.definingBlock)
             }
         }
 
@@ -125,7 +105,7 @@ internal class AstIdentifiersChecker(private val program: Program, private val e
             // the builtin functions can't be redefined
             errors.err("builtin function cannot be redefined", label.position)
         } else {
-            val existing = label.definingSubroutine()?.getAllLabels(label.name) ?: emptyList()
+            val existing = label.definingSubroutine?.getAllLabels(label.name) ?: emptyList()
             for(el in existing) {
                 if(el === label || el.name != label.name)
                     continue

compiler/src/prog8/compiler/astprocessing/AstVariousTransforms.kt

@@ -17,7 +17,7 @@ internal class AstVariousTransforms(private val program: Program) : AstWalker()
     override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
         // For non-kernal subroutines and non-asm parameters:
         // inject subroutine params as local variables (if they're not there yet).
-        val symbolsInSub = subroutine.allDefinedSymbols()
+        val symbolsInSub = subroutine.allDefinedSymbols
         val namesInSub = symbolsInSub.map{ it.first }.toSet()
         if(subroutine.asmAddress==null) {
             if(subroutine.asmParameterRegisters.isEmpty() && subroutine.parameters.isNotEmpty()) {

compiler/src/prog8/compiler/astprocessing/LiteralsToAutoVars.kt

@@ -16,7 +16,7 @@ internal class LiteralsToAutoVars(private val program: Program) : AstWalker() {
 
     override fun after(string: StringLiteralValue, parent: Node): Iterable<IAstModification> {
         if(string.parent !is VarDecl && string.parent !is WhenChoice) {
-            // replace the literal string by a identifier reference to the interned string
+            // replace the literal string by an identifier reference to the interned string
             val scopedName = program.internString(string)
             val identifier = IdentifierReference(scopedName, string.position)
             return listOf(IAstModification.ReplaceNode(string, identifier, parent))
@@ -29,7 +29,7 @@ internal class LiteralsToAutoVars(private val program: Program) : AstWalker() {
         if(vardecl!=null) {
             // adjust the datatype of the array (to an educated guess)
             val arrayDt = array.type
-            if(!arrayDt.istype(vardecl.datatype)) {
+            if(arrayDt isnot vardecl.datatype) {
                 val cast = array.cast(vardecl.datatype)
                 if (cast != null && cast !== array)
                     return listOf(IAstModification.ReplaceNode(vardecl.value!!, cast, vardecl))
@@ -38,13 +38,13 @@ internal class LiteralsToAutoVars(private val program: Program) : AstWalker() {
             val arrayDt = array.guessDatatype(program)
             if(arrayDt.isKnown) {
                 // this array literal is part of an expression, turn it into an identifier reference
-                val litval2 = array.cast(arrayDt.typeOrElse(DataType.UNDEFINED))
+                val litval2 = array.cast(arrayDt.getOr(DataType.UNDEFINED))
                 if(litval2!=null) {
                     val vardecl2 = VarDecl.createAuto(litval2)
                     val identifier = IdentifierReference(listOf(vardecl2.name), vardecl2.position)
                     return listOf(
                             IAstModification.ReplaceNode(array, identifier, parent),
-                            IAstModification.InsertFirst(vardecl2, array.definingScope())
+                            IAstModification.InsertFirst(vardecl2, array.definingScope)
                     )
                 }
             }

compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt

@@ -24,7 +24,7 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
     // - (syntax desugaring) a vardecl with a non-const initializer value is split into a regular vardecl and an assignment statement.
     // - in-place assignments are reordered a bit so that they are mostly of the form A = A <operator> <rest>
     // - sorts the choices in when statement.
-    // - insert AddressOf (&) expression where required (string params to a UWORD function param etc).
+    // - insert AddressOf (&) expression where required (string params to a UWORD function param etc.).
 
     private val directivesToMove = setOf("%output", "%launcher", "%zeropage", "%zpreserved", "%address", "%option")
 
@@ -93,7 +93,7 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
 
         // ConstValue <associativeoperator> X -->  X <associativeoperator> ConstValue
         // (this should be done by the ExpressionSimplifier when optimizing is enabled,
-        //  but the current assembly code generator for IF statements now also depends on it so we do it here regardless of optimization.)
+        //  but the current assembly code generator for IF statements now also depends on it, so we do it here regardless of optimization.)
         if (expr.left.constValue(program) != null && expr.operator in associativeOperators && expr.right.constValue(program) == null)
             return listOf(IAstModification.SwapOperands(expr))
 
@@ -106,12 +106,12 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
                 is Assignment -> {
                     val targetDt = parent.target.inferType(program)
                     if(leftDt != targetDt) {
-                        val cast = TypecastExpression(expr.left, targetDt.typeOrElse(DataType.UNDEFINED), true, parent.position)
+                        val cast = TypecastExpression(expr.left, targetDt.getOr(DataType.UNDEFINED), true, parent.position)
                         return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
                     }
                 }
                 is VarDecl -> {
-                    if(!leftDt.istype(parent.datatype)) {
+                    if(leftDt isnot parent.datatype) {
                         val cast = TypecastExpression(expr.left, parent.datatype, true, parent.position)
                         return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
                     }
@@ -190,7 +190,7 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
         val valueType = assignment.value.inferType(program)
         val targetType = assignment.target.inferType(program)
 
-        if(targetType.isArray() && valueType.isArray() ) {
+        if(targetType.isArray && valueType.isArray) {
             if (assignment.value is ArrayLiteralValue) {
                 errors.err("cannot assign array literal here, use separate assignment per element", assignment.position)
             } else {

compiler/src/prog8/compiler/astprocessing/TypecastsAdder.kt

@@ -22,10 +22,10 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
         val declValue = decl.value
         if(decl.type==VarDeclType.VAR && declValue!=null) {
             val valueDt = declValue.inferType(program)
-            if(!valueDt.istype(decl.datatype)) {
+            if(valueDt isnot decl.datatype) {
 
                 // don't add a typecast on an array initializer value
-                if(valueDt.isInteger() && decl.datatype in ArrayDatatypes)
+                if(valueDt.isInteger && decl.datatype in ArrayDatatypes)
                     return noModifications
 
                 // don't add a typecast if the initializer value is inherently not assignable
@@ -47,7 +47,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
         val rightDt = expr.right.inferType(program)
         if(leftDt.isKnown && rightDt.isKnown && leftDt!=rightDt) {
             // determine common datatype and add typecast as required to make left and right equal types
-            val (commonDt, toFix) = BinaryExpression.commonDatatype(leftDt.typeOrElse(DataType.UNDEFINED), rightDt.typeOrElse(DataType.UNDEFINED), expr.left, expr.right)
+            val (commonDt, toFix) = BinaryExpression.commonDatatype(leftDt.getOr(DataType.UNDEFINED), rightDt.getOr(DataType.UNDEFINED), expr.left, expr.right)
             if(toFix!=null) {
                 return when {
                     toFix===expr.left -> listOf(IAstModification.ReplaceNode(
@@ -66,8 +66,8 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
         val valueItype = assignment.value.inferType(program)
         val targetItype = assignment.target.inferType(program)
         if(targetItype.isKnown && valueItype.isKnown) {
-            val targettype = targetItype.typeOrElse(DataType.UNDEFINED)
-            val valuetype = valueItype.typeOrElse(DataType.UNDEFINED)
+            val targettype = targetItype.getOr(DataType.UNDEFINED)
+            val valuetype = valueItype.getOr(DataType.UNDEFINED)
             if (valuetype != targettype) {
                 if (valuetype isAssignableTo targettype) {
                     if(valuetype in IterableDatatypes && targettype==DataType.UWORD)
@@ -126,7 +126,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
                 sub.parameters.zip(call.args).forEachIndexed { index, pair ->
                     val argItype = pair.second.inferType(program)
                     if(argItype.isKnown) {
-                        val argtype = argItype.typeOrElse(DataType.UNDEFINED)
+                        val argtype = argItype.getOr(DataType.UNDEFINED)
                         val requiredType = pair.first.type
                         if (requiredType != argtype) {
                             if (argtype isAssignableTo requiredType) {
@@ -159,7 +159,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
                 func.parameters.zip(call.args).forEachIndexed { index, pair ->
                     val argItype = pair.second.inferType(program)
                     if (argItype.isKnown) {
-                        val argtype = argItype.typeOrElse(DataType.UNDEFINED)
+                        val argtype = argItype.getOr(DataType.UNDEFINED)
                         if (pair.first.possibleDatatypes.all { argtype != it }) {
                             for (possibleType in pair.first.possibleDatatypes) {
                                 if (argtype isAssignableTo possibleType) {
@@ -182,7 +182,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
 
     override fun after(typecast: TypecastExpression, parent: Node): Iterable<IAstModification> {
         // warn about any implicit type casts to Float, because that may not be intended
-        if(typecast.implicit && typecast.type in setOf(DataType.FLOAT, DataType.ARRAY_F)) {
+        if(typecast.implicit && typecast.type.oneOf(DataType.FLOAT, DataType.ARRAY_F)) {
             errors.warn("integer implicitly converted to float. Suggestion: use float literals, add an explicit cast, or revert to integer arithmetic", typecast.position)
         }
         return noModifications
@@ -191,7 +191,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
     override fun after(memread: DirectMemoryRead, parent: Node): Iterable<IAstModification> {
         // make sure the memory address is an uword
         val dt = memread.addressExpression.inferType(program)
-        if(dt.isKnown && dt.typeOrElse(DataType.UWORD)!=DataType.UWORD) {
+        if(dt.isKnown && dt.getOr(DataType.UWORD)!=DataType.UWORD) {
             val typecast = (memread.addressExpression as? NumericLiteralValue)?.cast(DataType.UWORD)?.valueOrZero()
                     ?: TypecastExpression(memread.addressExpression, DataType.UWORD, true, memread.addressExpression.position)
             return listOf(IAstModification.ReplaceNode(memread.addressExpression, typecast, memread))
@@ -202,7 +202,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
     override fun after(memwrite: DirectMemoryWrite, parent: Node): Iterable<IAstModification> {
         // make sure the memory address is an uword
         val dt = memwrite.addressExpression.inferType(program)
-        if(dt.isKnown && dt.typeOrElse(DataType.UWORD)!=DataType.UWORD) {
+        if(dt.isKnown && dt.getOr(DataType.UWORD)!=DataType.UWORD) {
             val typecast = (memwrite.addressExpression as? NumericLiteralValue)?.cast(DataType.UWORD)?.valueOrZero()
                     ?: TypecastExpression(memwrite.addressExpression, DataType.UWORD, true, memwrite.addressExpression.position)
             return listOf(IAstModification.ReplaceNode(memwrite.addressExpression, typecast, memwrite))
@@ -214,10 +214,10 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
         // add a typecast to the return type if it doesn't match the subroutine's signature
         val returnValue = returnStmt.value
         if(returnValue!=null) {
-            val subroutine = returnStmt.definingSubroutine()!!
+            val subroutine = returnStmt.definingSubroutine!!
             if(subroutine.returntypes.size==1) {
                 val subReturnType = subroutine.returntypes.first()
-                if (returnValue.inferType(program).istype(subReturnType))
+                if (returnValue.inferType(program) istype subReturnType)
                     return noModifications
                 if (returnValue is NumericLiteralValue) {
                     val cast = returnValue.cast(subroutine.returntypes.single())

compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt

@@ -71,7 +71,7 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter)
         }
 
         val sourceDt = typecast.expression.inferType(program)
-        if(sourceDt.istype(typecast.type))
+        if(sourceDt istype typecast.type)
             return listOf(IAstModification.ReplaceNode(typecast, typecast.expression, parent))
 
         return noModifications

compiler/src/prog8/compiler/astprocessing/VerifyFunctionArgTypes.kt

@@ -44,7 +44,7 @@ class VerifyFunctionArgTypes(val program: Program) : IAstVisitor {
             val firstUnknownDt = argITypes.indexOfFirst { it.isUnknown }
             if(firstUnknownDt>=0)
                 return "argument ${firstUnknownDt+1} invalid argument type"
-            val argtypes = argITypes.map { it.typeOrElse(DataType.UNDEFINED) }
+            val argtypes = argITypes.map { it.getOr(DataType.UNDEFINED) }
             val target = call.target.targetStatement(program)
             if (target is Subroutine) {
                 if(call.args.size != target.parameters.size)

compiler/src/prog8/compiler/functions/BuiltinFunctions.kt

@@ -9,7 +9,7 @@ import prog8.compiler.CompilerException
 import kotlin.math.*
 
 
-class FParam(val name: String, val possibleDatatypes: Set<DataType>)
+class FParam(val name: String, val possibleDatatypes: Array<DataType>)
 
 
 typealias ConstExpressionCaller = (args: List<Expression>, position: Position, program: Program, memsizer: IMemSizer) -> NumericLiteralValue
@@ -90,10 +90,10 @@ class FSignature(val name: String,
 @Suppress("UNUSED_ANONYMOUS_PARAMETER")
 private val functionSignatures: List<FSignature> = listOf(
         // this set of function have no return value and operate in-place:
-    FSignature("rol"         , false, listOf(FParam("item", setOf(DataType.UBYTE, DataType.UWORD))), null),
-    FSignature("ror"         , false, listOf(FParam("item", setOf(DataType.UBYTE, DataType.UWORD))), null),
-    FSignature("rol2"        , false, listOf(FParam("item", setOf(DataType.UBYTE, DataType.UWORD))), null),
-    FSignature("ror2"        , false, listOf(FParam("item", setOf(DataType.UBYTE, DataType.UWORD))), null),
+    FSignature("rol"         , false, listOf(FParam("item", arrayOf(DataType.UBYTE, DataType.UWORD))), null),
+    FSignature("ror"         , false, listOf(FParam("item", arrayOf(DataType.UBYTE, DataType.UWORD))), null),
+    FSignature("rol2"        , false, listOf(FParam("item", arrayOf(DataType.UBYTE, DataType.UWORD))), null),
+    FSignature("ror2"        , false, listOf(FParam("item", arrayOf(DataType.UBYTE, DataType.UWORD))), null),
     FSignature("sort"        , false, listOf(FParam("array", ArrayDatatypes)), null),
     FSignature("reverse"     , false, listOf(FParam("array", ArrayDatatypes)), null),
     FSignature("cmp"         , false, listOf(FParam("value1", IntegerDatatypes), FParam("value2", NumericDatatypes)), null),
@@ -103,46 +103,46 @@ private val functionSignatures: List<FSignature> = listOf(
     FSignature("sum"         , true, listOf(FParam("values", ArrayDatatypes)), null) { a, p, prg, ct -> collectionArg(a, p, prg, ::builtinSum) },      // type depends on args
     FSignature("abs"         , true, listOf(FParam("value", NumericDatatypes)), null, ::builtinAbs),      // type depends on argument
     FSignature("len"         , true, listOf(FParam("values", IterableDatatypes)), null, ::builtinLen),    // type is UBYTE or UWORD depending on actual length
-    FSignature("sizeof"      , true, listOf(FParam("object", DataType.values().toSet())), DataType.UBYTE, ::builtinSizeof),
+    FSignature("sizeof"      , true, listOf(FParam("object", DataType.values())), DataType.UBYTE, ::builtinSizeof),
         // normal functions follow:
     FSignature("sgn"         , true, listOf(FParam("value", NumericDatatypes)), DataType.BYTE, ::builtinSgn ),
-    FSignature("sin"         , true, listOf(FParam("rads", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::sin) },
-    FSignature("sin8"        , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.BYTE, ::builtinSin8 ),
-    FSignature("sin8u"       , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.UBYTE, ::builtinSin8u ),
-    FSignature("sin16"       , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.WORD, ::builtinSin16 ),
-    FSignature("sin16u"      , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.UWORD, ::builtinSin16u ),
-    FSignature("cos"         , true, listOf(FParam("rads", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::cos) },
-    FSignature("cos8"        , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.BYTE, ::builtinCos8 ),
-    FSignature("cos8u"       , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.UBYTE, ::builtinCos8u ),
-    FSignature("cos16"       , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.WORD, ::builtinCos16 ),
-    FSignature("cos16u"      , true, listOf(FParam("angle8", setOf(DataType.UBYTE))), DataType.UWORD, ::builtinCos16u ),
-    FSignature("tan"         , true, listOf(FParam("rads", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::tan) },
-    FSignature("atan"        , true, listOf(FParam("rads", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::atan) },
-    FSignature("ln"          , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::log) },
-    FSignature("log2"        , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, ::log2) },
-    FSignature("sqrt16"      , true, listOf(FParam("value", setOf(DataType.UWORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { sqrt(it.toDouble()).toInt() } },
-    FSignature("sqrt"        , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::sqrt) },
-    FSignature("rad"         , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::toRadians) },
-    FSignature("deg"         , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::toDegrees) },
-    FSignature("round"       , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::round) },
-    FSignature("floor"       , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::floor) },
-    FSignature("ceil"        , true, listOf(FParam("value", setOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::ceil) },
+    FSignature("sin"         , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::sin) },
+    FSignature("sin8"        , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.BYTE, ::builtinSin8 ),
+    FSignature("sin8u"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinSin8u ),
+    FSignature("sin16"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinSin16 ),
+    FSignature("sin16u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinSin16u ),
+    FSignature("cos"         , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::cos) },
+    FSignature("cos8"        , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.BYTE, ::builtinCos8 ),
+    FSignature("cos8u"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinCos8u ),
+    FSignature("cos16"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinCos16 ),
+    FSignature("cos16u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinCos16u ),
+    FSignature("tan"         , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::tan) },
+    FSignature("atan"        , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::atan) },
+    FSignature("ln"          , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::log) },
+    FSignature("log2"        , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, ::log2) },
+    FSignature("sqrt16"      , true, listOf(FParam("value", arrayOf(DataType.UWORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { sqrt(it.toDouble()).toInt() } },
+    FSignature("sqrt"        , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::sqrt) },
+    FSignature("rad"         , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::toRadians) },
+    FSignature("deg"         , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArg(a, p, prg, Math::toDegrees) },
+    FSignature("round"       , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::round) },
+    FSignature("floor"       , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::floor) },
+    FSignature("ceil"        , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg, ct -> oneDoubleArgOutputWord(a, p, prg, Math::ceil) },
     FSignature("any"         , true, listOf(FParam("values", ArrayDatatypes)), DataType.UBYTE) { a, p, prg, ct -> collectionArg(a, p, prg, ::builtinAny) },
     FSignature("all"         , true, listOf(FParam("values", ArrayDatatypes)), DataType.UBYTE) { a, p, prg, ct -> collectionArg(a, p, prg, ::builtinAll) },
-    FSignature("lsb"         , true, listOf(FParam("value", setOf(DataType.UWORD, DataType.WORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { x: Int -> x and 255 } },
-    FSignature("msb"         , true, listOf(FParam("value", setOf(DataType.UWORD, DataType.WORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { x: Int -> x ushr 8 and 255} },
-    FSignature("mkword"      , true, listOf(FParam("msb", setOf(DataType.UBYTE)), FParam("lsb", setOf(DataType.UBYTE))), DataType.UWORD, ::builtinMkword),
-    FSignature("peek"        , true, listOf(FParam("address", setOf(DataType.UWORD))), DataType.UBYTE),
-    FSignature("peekw"       , true, listOf(FParam("address", setOf(DataType.UWORD))), DataType.UWORD),
-    FSignature("poke"        , false, listOf(FParam("address", setOf(DataType.UWORD)), FParam("value", setOf(DataType.UBYTE))), null),
-    FSignature("pokew"       , false, listOf(FParam("address", setOf(DataType.UWORD)), FParam("value", setOf(DataType.UWORD))), null),
+    FSignature("lsb"         , true, listOf(FParam("value", arrayOf(DataType.UWORD, DataType.WORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { x: Int -> x and 255 } },
+    FSignature("msb"         , true, listOf(FParam("value", arrayOf(DataType.UWORD, DataType.WORD))), DataType.UBYTE) { a, p, prg, ct -> oneIntArgOutputInt(a, p, prg) { x: Int -> x ushr 8 and 255} },
+    FSignature("mkword"      , true, listOf(FParam("msb", arrayOf(DataType.UBYTE)), FParam("lsb", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinMkword),
+    FSignature("peek"        , true, listOf(FParam("address", arrayOf(DataType.UWORD))), DataType.UBYTE),
+    FSignature("peekw"       , true, listOf(FParam("address", arrayOf(DataType.UWORD))), DataType.UWORD),
+    FSignature("poke"        , false, listOf(FParam("address", arrayOf(DataType.UWORD)), FParam("value", arrayOf(DataType.UBYTE))), null),
+    FSignature("pokew"       , false, listOf(FParam("address", arrayOf(DataType.UWORD)), FParam("value", arrayOf(DataType.UWORD))), null),
     FSignature("rnd"         , false, emptyList(), DataType.UBYTE),
     FSignature("rndw"        , false, emptyList(), DataType.UWORD),
     FSignature("rndf"        , false, emptyList(), DataType.FLOAT),
-    FSignature("memory"      , true, listOf(FParam("name", setOf(DataType.STR)), FParam("size", setOf(DataType.UWORD))), DataType.UWORD),
+    FSignature("memory"      , true, listOf(FParam("name", arrayOf(DataType.STR)), FParam("size", arrayOf(DataType.UWORD))), DataType.UWORD),
     FSignature("swap"        , false, listOf(FParam("first", NumericDatatypes), FParam("second", NumericDatatypes)), null),
-    FSignature("callfar"     , false, listOf(FParam("bank", setOf(DataType.UBYTE)), FParam("address", setOf(DataType.UWORD)), FParam("arg", setOf(DataType.UWORD))), null),
-    FSignature("callrom"     , false, listOf(FParam("bank", setOf(DataType.UBYTE)), FParam("address", setOf(DataType.UWORD)), FParam("arg", setOf(DataType.UWORD))), null),
+    FSignature("callfar"     , false, listOf(FParam("bank", arrayOf(DataType.UBYTE)), FParam("address", arrayOf(DataType.UWORD)), FParam("arg", arrayOf(DataType.UWORD))), null),
+    FSignature("callrom"     , false, listOf(FParam("bank", arrayOf(DataType.UBYTE)), FParam("address", arrayOf(DataType.UWORD)), FParam("arg", arrayOf(DataType.UWORD))), null),
 
 )
 
@@ -164,7 +164,7 @@ fun builtinFunctionReturnType(function: String, args: List<Expression>, program:
 
     fun datatypeFromIterableArg(arglist: Expression): DataType {
         if(arglist is ArrayLiteralValue) {
-            val dt = arglist.value.map {it.inferType(program).typeOrElse(DataType.UNDEFINED)}.toSet()
+            val dt = arglist.value.map {it.inferType(program).getOr(DataType.UNDEFINED)}.toSet()
             if(dt.any { it !in NumericDatatypes }) {
                 throw FatalAstException("fuction $function only accepts array of numeric values")
             }
@@ -178,7 +178,7 @@ fun builtinFunctionReturnType(function: String, args: List<Expression>, program:
             val idt = arglist.inferType(program)
             if(!idt.isKnown)
                 throw FatalAstException("couldn't determine type of iterable $arglist")
-            return when(val dt = idt.typeOrElse(DataType.UNDEFINED)) {
+            return when(val dt = idt.getOr(DataType.UNDEFINED)) {
                 DataType.STR, in NumericDatatypes -> dt
                 in ArrayDatatypes -> ArrayToElementTypes.getValue(dt)
                 else -> throw FatalAstException("function '$function' requires one argument which is an iterable")
@@ -195,7 +195,7 @@ fun builtinFunctionReturnType(function: String, args: List<Expression>, program:
     return when (function) {
         "abs" -> {
             val dt = args.single().inferType(program)
-            return if(dt.isNumeric())
+            return if(dt.isNumeric)
                 dt
             else
                 InferredTypes.InferredType.unknown()
@@ -300,13 +300,13 @@ private fun builtinSizeof(args: List<Expression>, position: Position, program: P
                 ?: throw CannotEvaluateException("sizeof", "no target")
 
         return when {
-            dt.isArray() -> {
+            dt.isArray -> {
                 val length = (target as VarDecl).arraysize!!.constIndex() ?: throw CannotEvaluateException("sizeof", "unknown array size")
-                val elementDt = ArrayToElementTypes.getValue(dt.typeOrElse(DataType.UNDEFINED))
+                val elementDt = ArrayToElementTypes.getValue(dt.getOr(DataType.UNDEFINED))
                 numericLiteral(memsizer.memorySize(elementDt) * length, position)
             }
-            dt.istype(DataType.STR) -> throw SyntaxError("sizeof str is undefined, did you mean len?", position)
-            else -> NumericLiteralValue(DataType.UBYTE, memsizer.memorySize(dt.typeOrElse(DataType.UNDEFINED)), position)
+            dt istype DataType.STR -> throw SyntaxError("sizeof str is undefined, did you mean len?", position)
+            else -> NumericLiteralValue(DataType.UBYTE, memsizer.memorySize(dt.getOr(DataType.UNDEFINED)), position)
         }
     } else {
         throw SyntaxError("sizeof invalid argument type", position)
@@ -315,7 +315,7 @@ private fun builtinSizeof(args: List<Expression>, position: Position, program: P
 
 @Suppress("UNUSED_PARAMETER")
 private fun builtinLen(args: List<Expression>, position: Position, program: Program, memsizer: IMemSizer): NumericLiteralValue {
-    // note: in some cases the length is > 255 and then we have to return a UWORD type instead of a UBYTE.
+    // note: in some cases the length is > 255, and then we have to return a UWORD type instead of a UBYTE.
     if(args.size!=1)
         throw SyntaxError("len requires one argument", position)
 

compiler/src/prog8/compiler/target/IAssemblyGenerator.kt

@@ -11,6 +11,7 @@ internal const val subroutineFloatEvalResultVar1 = "_prog8_float_eval_result1"
 internal const val subroutineFloatEvalResultVar2 = "_prog8_float_eval_result2"
 
 internal interface IAssemblyProgram {
+    val valid: Boolean
     val name: String
-    fun assemble(options: CompilationOptions)
+    fun assemble(options: CompilationOptions): Int
 }

compiler/src/prog8/compiler/target/ICompilationTarget.kt

@@ -1,7 +1,7 @@
 package prog8.compiler.target
 
+import com.github.michaelbull.result.fold
 import prog8.ast.IMemSizer
-import prog8.ast.IStringEncoding
 import prog8.ast.Program
 import prog8.ast.base.*
 import prog8.ast.expressions.IdentifierReference
@@ -9,6 +9,7 @@ import prog8.ast.expressions.NumericLiteralValue
 import prog8.ast.statements.AssignTarget
 import prog8.compiler.CompilationOptions
 import prog8.compiler.IErrorReporter
+import prog8.compiler.IStringEncoding
 import prog8.compiler.Zeropage
 import prog8.compiler.target.c64.C64MachineDefinition
 import prog8.compiler.target.cbm.Petscii
@@ -23,59 +24,19 @@ interface ICompilationTarget: IStringEncoding, IMemSizer {
     val machine: IMachineDefinition
     override fun encodeString(str: String, altEncoding: Boolean): List<Short>
     override fun decodeString(bytes: List<Short>, altEncoding: Boolean): String
-
-    fun isInRegularRAM(target: AssignTarget, program: Program): Boolean {
-        val memAddr = target.memoryAddress
-        val arrayIdx = target.arrayindexed
-        val ident = target.identifier
-        when {
-            memAddr != null -> {
-                return when (memAddr.addressExpression) {
-                    is NumericLiteralValue -> {
-                        machine.isRegularRAMaddress((memAddr.addressExpression as NumericLiteralValue).number.toInt())
-                    }
-                    is IdentifierReference -> {
-                        val decl = (memAddr.addressExpression as IdentifierReference).targetVarDecl(program)
-                        if ((decl?.type == VarDeclType.VAR || decl?.type == VarDeclType.CONST) && decl.value is NumericLiteralValue)
-                            machine.isRegularRAMaddress((decl.value as NumericLiteralValue).number.toInt())
-                        else
-                            false
-                    }
-                    else -> false
-                }
-            }
-            arrayIdx != null -> {
-                val targetStmt = arrayIdx.arrayvar.targetVarDecl(program)
-                return if (targetStmt?.type == VarDeclType.MEMORY) {
-                    val addr = targetStmt.value as? NumericLiteralValue
-                    if (addr != null)
-                        machine.isRegularRAMaddress(addr.number.toInt())
-                    else
-                        false
-                } else true
-            }
-            ident != null -> {
-                val decl = ident.targetVarDecl(program)!!
-                return if (decl.type == VarDeclType.MEMORY && decl.value is NumericLiteralValue)
-                    machine.isRegularRAMaddress((decl.value as NumericLiteralValue).number.toInt())
-                else
-                    true
-            }
-            else -> return true
-        }
-    }
 }
 
 
 internal object C64Target: ICompilationTarget {
     override val name = "c64"
     override val machine = C64MachineDefinition
-    override fun encodeString(str: String, altEncoding: Boolean) =
-        try {
-            if (altEncoding) Petscii.encodeScreencode(str, true) else Petscii.encodePetscii(str, true)
-        } catch (x: CharConversionException) {
-            throw CharConversionException("can't convert string to target machine's char encoding: ${x.message}")
-        }
+    override fun encodeString(str: String, altEncoding: Boolean): List<Short> {
+        val coded = if (altEncoding) Petscii.encodeScreencode(str, true) else Petscii.encodePetscii(str, true)
+        return coded.fold(
+            failure = { throw it },
+            success = { it }
+        )
+    }
     override fun decodeString(bytes: List<Short>, altEncoding: Boolean) =
         try {
             if (altEncoding) Petscii.decodeScreencode(bytes, true) else Petscii.decodePetscii(bytes, true)
@@ -97,12 +58,13 @@ internal object C64Target: ICompilationTarget {
 internal object Cx16Target: ICompilationTarget {
     override val name = "cx16"
     override val machine = CX16MachineDefinition
-    override fun encodeString(str: String, altEncoding: Boolean) =
-        try {
-            if (altEncoding) Petscii.encodeScreencode(str, true) else Petscii.encodePetscii(str, true)
-        } catch (x: CharConversionException) {
-            throw CharConversionException("can't convert string to target machine's char encoding: ${x.message}")
-        }
+    override fun encodeString(str: String, altEncoding: Boolean): List<Short> {
+        val coded= if (altEncoding) Petscii.encodeScreencode(str, true) else Petscii.encodePetscii(str, true)
+        return coded.fold(
+            failure = { throw it },
+            success = { it }
+        )
+    }
     override fun decodeString(bytes: List<Short>, altEncoding: Boolean) =
         try {
             if (altEncoding) Petscii.decodeScreencode(bytes, true) else Petscii.decodePetscii(bytes, true)

compiler/src/prog8/compiler/target/IMachineDefinition.kt

@@ -2,6 +2,7 @@ package prog8.compiler.target
 
 import prog8.compiler.CompilationOptions
 import prog8.compiler.Zeropage
+import java.nio.file.Path
 
 
 interface IMachineFloat {
@@ -32,6 +33,6 @@ interface IMachineDefinition {
     fun getFloat(num: Number): IMachineFloat
 
     fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String>
-    fun launchEmulator(programName: String)
+    fun launchEmulator(selectedEmulator: Int, programNameWithPath: Path)
     fun isRegularRAMaddress(address: Int): Boolean
 }

compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt

@@ -4,7 +4,9 @@ import prog8.compiler.*
 import prog8.compiler.target.CpuType
 import prog8.compiler.target.IMachineDefinition
 import prog8.compiler.target.IMachineFloat
+import prog8.compiler.target.cbm.viceMonListPostfix
 import java.io.IOException
+import java.nio.file.Path
 import kotlin.math.absoluteValue
 import kotlin.math.pow
 
@@ -35,11 +37,16 @@ internal object C64MachineDefinition: IMachineDefinition {
             emptyList()
     }
 
-    override fun launchEmulator(programName: String) {
+    override fun launchEmulator(selectedEmulator: Int, programNameWithPath: Path) {
+        if(selectedEmulator!=1) {
+            System.err.println("The c64 target only supports the main emulator (Vice).")
+            return
+        }
+
         for(emulator in listOf("x64sc", "x64")) {
             println("\nStarting C-64 emulator $emulator...")
-            val cmdline = listOf(emulator, "-silent", "-moncommands", "$programName.vice-mon-list",
-                    "-autostartprgmode", "1", "-autostart-warp", "-autostart", "$programName.prg")
+            val cmdline = listOf(emulator, "-silent", "-moncommands", "${programNameWithPath}.$viceMonListPostfix",
+                    "-autostartprgmode", "1", "-autostart-warp", "-autostart", "${programNameWithPath}.prg")
             val processb = ProcessBuilder(cmdline).inheritIO()
             val process: Process
             try {
@@ -79,7 +86,7 @@ internal object C64MachineDefinition: IMachineDefinition {
 
 
         init {
-            if (options.floats && options.zeropage !in setOf(ZeropageType.FLOATSAFE, ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
+            if (options.floats && options.zeropage !in arrayOf(ZeropageType.FLOATSAFE, ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
                 throw CompilerException("when floats are enabled, zero page type should be 'floatsafe' or 'basicsafe' or 'dontuse'")
 
             if (options.zeropage == ZeropageType.FULL) {
@@ -107,7 +114,7 @@ internal object C64MachineDefinition: IMachineDefinition {
                 }
 
                 if (options.zeropage == ZeropageType.FLOATSAFE) {
-                    // remove the zero page locations used for floating point operations from the free list
+                    // remove the zeropage locations used for floating point operations from the free list
                     free.removeAll(listOf(
                             0x22, 0x23, 0x24, 0x25,
                             0x10, 0x11, 0x12, 0x26, 0x27, 0x28, 0x29, 0x2a,

compiler/src/prog8/compiler/target/cbm/AssemblyProgram.kt

@@ -5,15 +5,22 @@ import prog8.compiler.OutputType
 import prog8.compiler.target.IAssemblyProgram
 import prog8.compiler.target.generatedLabelPrefix
 import java.nio.file.Path
-import kotlin.system.exitProcess
 
-class AssemblyProgram(override val name: String, outputDir: Path, private val compTarget: String) : IAssemblyProgram {
+
+internal const val viceMonListPostfix = "vice-mon-list"
+
+class AssemblyProgram(
+        override val valid: Boolean,
+        override val name: String,
+        outputDir: Path,
+        private val compTarget: String) : IAssemblyProgram {
+
     private val assemblyFile = outputDir.resolve("$name.asm")
     private val prgFile = outputDir.resolve("$name.prg")
     private val binFile = outputDir.resolve("$name.bin")
-    private val viceMonListFile = outputDir.resolve("$name.vice-mon-list")
+    private val viceMonListFile = outputDir.resolve("$name.$viceMonListPostfix")
 
-    override fun assemble(options: CompilationOptions) {
+    override fun assemble(options: CompilationOptions): Int {
         // add "-Wlong-branch"  to see warnings about conversion of branch instructions to jumps (default = do this silently)
         val command = mutableListOf("64tass", "--ascii", "--case-sensitive", "--long-branch",
                 "-Wall", "-Wno-strict-bool", "-Wno-shadow", // "-Werror",
@@ -35,13 +42,11 @@ class AssemblyProgram(override val name: String, outputDir: Path, private val co
 
         val proc = ProcessBuilder(command).inheritIO().start()
         val result = proc.waitFor()
-        if (result != 0) {
-            System.err.println("assembler failed with returncode $result")
-            exitProcess(result)
+        if (result == 0) {
+            removeGeneratedLabelsFromMonlist()
+            generateBreakpointList()
         }
-
-        removeGeneratedLabelsFromMonlist()
-        generateBreakpointList()
+        return result
     }
 
     private fun removeGeneratedLabelsFromMonlist() {

compiler/src/prog8/compiler/target/cpu6502/codegen/AsmGen.kt

@@ -1,5 +1,6 @@
 package prog8.compiler.target.cpu6502.codegen
 
+import com.github.michaelbull.result.*
 import prog8.ast.*
 import prog8.ast.antlr.escape
 import prog8.ast.base.*
@@ -13,11 +14,13 @@ import prog8.compiler.target.cbm.AssemblyProgram
 import prog8.compiler.target.cpu6502.codegen.assignment.AsmAssignment
 import prog8.compiler.target.cpu6502.codegen.assignment.AssignmentAsmGen
 import prog8.optimizer.CallGraph
+import prog8.parser.SourceCode
 import java.nio.file.Path
-import java.nio.file.Paths
 import java.time.LocalDate
 import java.time.LocalDateTime
 import java.util.*
+import kotlin.io.path.Path
+import kotlin.io.path.absolute
 import kotlin.math.absoluteValue
 
 
@@ -55,10 +58,10 @@ internal class AsmGen(private val program: Program,
         println("Generating assembly code... ")
 
         header()
-        val allBlocks = program.allBlocks()
+        val allBlocks = program.allBlocks
         if(allBlocks.first().name != "main")
             throw AssemblyError("first block should be 'main'")
-        for(b in program.allBlocks())
+        for(b in program.allBlocks)
             block2asm(b)
 
         for(removal in removals.toList()) {
@@ -86,7 +89,11 @@ internal class AsmGen(private val program: Program,
             }
         }
 
-        return AssemblyProgram(program.name, outputDir, compTarget.name)
+        return if(errors.noErrors())
+            AssemblyProgram(true, program.name, outputDir, compTarget.name)
+        else {
+            AssemblyProgram(false, "<error>", outputDir, compTarget.name)
+        }
     }
 
     internal fun isTargetCpu(cpu: CpuType) = compTarget.machine.cpu == cpu
@@ -148,7 +155,7 @@ internal class AsmGen(private val program: Program,
             }
         }
 
-        if(options.zeropage !in setOf(ZeropageType.BASICSAFE, ZeropageType.DONTUSE)) {
+        if(options.zeropage !in arrayOf(ZeropageType.BASICSAFE, ZeropageType.DONTUSE)) {
             out("""
                 ; zeropage is clobbered so we need to reset the machine at exit
                 lda  #>sys.reset_system
@@ -229,7 +236,7 @@ internal class AsmGen(private val program: Program,
 
     private fun assignInitialValueToVar(decl: VarDecl, variableName: List<String>) {
         val asmName = asmVariableName(variableName)
-        assignmentAsmGen.assignExpressionToVariable(decl.value!!, asmName, decl.datatype, decl.definingSubroutine())
+        assignmentAsmGen.assignExpressionToVariable(decl.value!!, asmName, decl.datatype, decl.definingSubroutine)
     }
 
     private var generatedLabelSequenceNumber: Int = 0
@@ -502,17 +509,19 @@ internal class AsmGen(private val program: Program,
             return identifier.nameInSource.joinToString(".")
 
         val target = identifier.targetStatement(program)!!
-        val targetScope = target.definingSubroutine()
-        val identScope = identifier.definingSubroutine()
+        val targetScope = target.definingSubroutine
+        val identScope = identifier.definingSubroutine
         return if(targetScope !== identScope) {
             val scopedName = getScopedSymbolNameForTarget(identifier.nameInSource.last(), target)
             if(target is Label) {
+                // make labels locally scoped in the asm. Is slightly problematic, see github issue #62
                 val last = scopedName.removeLast()
                 scopedName.add("_$last")
             }
             fixNameSymbols(scopedName.joinToString("."))
         } else {
             if(target is Label) {
+                // make labels locally scoped in the asm. Is slightly problematic, see github issue #62
                 val scopedName = identifier.nameInSource.toMutableList()
                 val last = scopedName.removeLast()
                 scopedName.add("_$last")
@@ -549,14 +558,14 @@ internal class AsmGen(private val program: Program,
     internal fun asmVariableName(name: Iterable<String>) = fixNameSymbols(name.joinToString("."))
 
 
-    internal fun loadByteFromPointerIntoA(pointervar: IdentifierReference): Pair<Boolean, String> {
-        // returns if the pointer is already on the ZP itself or not (in the latter case SCRATCH_W1 is used as intermediary)
-        val target = pointervar.targetStatement(program)
-        when (target) {
+    internal fun loadByteFromPointerIntoA(pointervar: IdentifierReference): String {
+        // returns the source name of the zero page pointervar if it's already in the ZP,
+        // otherwise returns "P8ZP_SCRATCH_W1" which is the intermediary
+        when (val target = pointervar.targetStatement(program)) {
             is Label -> {
                 val sourceName = asmSymbolName(pointervar)
                 out("  lda  $sourceName")
-                return Pair(true, sourceName)
+                return sourceName
             }
             is VarDecl -> {
                 val sourceName = asmVariableName(pointervar)
@@ -565,7 +574,7 @@ internal class AsmGen(private val program: Program,
                     return if (isZpVar(scopedName)) {
                         // pointervar is already in the zero page, no need to copy
                         out("  lda  ($sourceName)")
-                        Pair(true, sourceName)
+                        sourceName
                     } else {
                         out("""
                             lda  $sourceName
@@ -573,13 +582,13 @@ internal class AsmGen(private val program: Program,
                             sta  P8ZP_SCRATCH_W1
                             sty  P8ZP_SCRATCH_W1+1
                             lda  (P8ZP_SCRATCH_W1)""")
-                        Pair(false, sourceName)
+                        "P8ZP_SCRATCH_W1"
                     }
                 } else {
                     return if (isZpVar(scopedName)) {
                         // pointervar is already in the zero page, no need to copy
                         out("  ldy  #0 |  lda  ($sourceName),y")
-                        Pair(true, sourceName)
+                        sourceName
                     } else {
                         out("""
                             lda  $sourceName
@@ -588,7 +597,7 @@ internal class AsmGen(private val program: Program,
                             sty  P8ZP_SCRATCH_W1+1
                             ldy  #0
                             lda  (P8ZP_SCRATCH_W1),y""")
-                        Pair(false, sourceName)
+                        "P8ZP_SCRATCH_W1"
                     }
                 }
             }
@@ -864,7 +873,7 @@ internal class AsmGen(private val program: Program,
 
         if(sub.inline) {
             if(options.optimize) {
-                if(sub.isAsmSubroutine ||callGraph.unused(sub))
+                if(sub.isAsmSubroutine || callGraph.unused(sub))
                     return
 
                 // from an inlined subroutine only the local variables are generated,
@@ -873,7 +882,7 @@ internal class AsmGen(private val program: Program,
                 onlyVariables = true
             }
             else if(sub.amountOfRtsInAsm()==0) {
-                // make sure the NOT INLINED subroutine actually does an rts at the end
+                // make sure the NOT INLINED subroutine actually does a rts at the end
                 sub.statements.add(Return(null, Position.DUMMY))
             }
         }
@@ -897,10 +906,10 @@ internal class AsmGen(private val program: Program,
             memdefs2asm(sub.statements)
 
             // the main.start subroutine is the program's entrypoint and should perform some initialization logic
-            if(sub.name=="start" && sub.definingBlock().name=="main") {
+            if(sub.name=="start" && sub.definingBlock.name=="main") {
                 out("; program startup initialization")
                 out("  cld")
-                program.allBlocks().forEach {
+                program.allBlocks.forEach {
                     if(it.statements.filterIsInstance<VarDecl>().any { vd->vd.value!=null && vd.type==VarDeclType.VAR && vd.datatype in NumericDatatypes})
                         out("  jsr  ${it.name}.prog8_init_vars")
                 }
@@ -982,7 +991,7 @@ internal class AsmGen(private val program: Program,
 //        if(!booleanCondition.left.isSimple || !booleanCondition.right.isSimple)
 //            throw AssemblyError("both operands for if comparison expression should have been simplified")
 
-        if (stmt.elsepart.containsNoCodeNorVars()) {
+        if (stmt.elsepart.containsNoCodeNorVars) {
             // empty else
             val endLabel = makeLabel("if_end")
             expressionsAsmGen.translateComparisonExpressionWithJumpIfFalse(booleanCondition, endLabel)
@@ -1055,7 +1064,7 @@ internal class AsmGen(private val program: Program,
                 val dt = stmt.iterations!!.inferType(program)
                 if(!dt.isKnown)
                     throw AssemblyError("unknown dt")
-                when (dt.typeOrElse(DataType.UNDEFINED)) {
+                when (dt.getOr(DataType.UNDEFINED)) {
                     in ByteDatatypes -> {
                         assignExpressionToRegister(stmt.iterations!!, RegisterOrPair.A)
                         repeatByteCountInA(null, repeatLabel, endLabel, stmt)
@@ -1076,7 +1085,7 @@ internal class AsmGen(private val program: Program,
         // note: A/Y must have been loaded with the number of iterations!
         if(constIterations==0)
             return
-        // no need to explicitly test for 0 iterations as this is done in the count down logic below
+        // no need to explicitly test for 0 iterations as this is done in the countdown logic below
 
         val counterVar: String = createRepeatCounterVar(DataType.UWORD, constIterations, stmt)
         out("""
@@ -1097,7 +1106,7 @@ $repeatLabel    lda  $counterVar
     }
 
     private fun repeatByteCountInA(constIterations: Int?, repeatLabel: String, endLabel: String, stmt: RepeatLoop) {
-        // note: A must have been loaded with the number of iterations!
+        // note: A must be loaded with the number of iterations!
         if(constIterations==0)
             return
 
@@ -1113,7 +1122,7 @@ $repeatLabel    lda  $counterVar
     }
 
     private fun createRepeatCounterVar(dt: DataType, constIterations: Int?, stmt: RepeatLoop): String {
-        val asmInfo = stmt.definingSubroutine()!!.asmGenInfo
+        val asmInfo = stmt.definingSubroutine!!.asmGenInfo
         var parent = stmt.parent
         while(parent !is ParentSentinel) {
             if(parent is RepeatLoop)
@@ -1187,7 +1196,7 @@ $repeatLabel    lda  $counterVar
         val conditionDt = stmt.condition.inferType(program)
         if(!conditionDt.isKnown)
             throw AssemblyError("unknown condition dt")
-        if(conditionDt.typeOrElse(DataType.BYTE) in ByteDatatypes)
+        if(conditionDt.getOr(DataType.BYTE) in ByteDatatypes)
             assignExpressionToRegister(stmt.condition, RegisterOrPair.A)
         else
             assignExpressionToRegister(stmt.condition, RegisterOrPair.AY)
@@ -1202,7 +1211,7 @@ $repeatLabel    lda  $counterVar
                 choiceBlocks.add(choiceLabel to choice.statements)
                 for (cv in choice.values!!) {
                     val value = (cv as NumericLiteralValue).number.toInt()
-                    if(conditionDt.typeOrElse(DataType.BYTE) in ByteDatatypes) {
+                    if(conditionDt.getOr(DataType.BYTE) in ByteDatatypes) {
                         out("  cmp  #${value.toHex()} |  beq  $choiceLabel")
                     } else {
                         out("""
@@ -1226,7 +1235,8 @@ $repeatLabel    lda  $counterVar
     }
 
     private fun translate(stmt: Label) {
-        out("_${stmt.name}")        // underscore prefix to make sure it's a local label
+        // underscore prefix to make sure it's a local label. Is slightly problematic, see github issue #62
+        out("_${stmt.name}")
     }
 
     private fun translate(scope: AnonymousScope) {
@@ -1235,7 +1245,7 @@ $repeatLabel    lda  $counterVar
     }
 
     private fun translate(stmt: BranchStatement) {
-        if(stmt.truepart.containsNoCodeNorVars() && stmt.elsepart.containsCodeOrVars())
+        if(stmt.truepart.containsNoCodeNorVars && stmt.elsepart.containsCodeOrVars)
             throw AssemblyError("only else part contains code, shoud have been switched already")
 
         val jump = stmt.truepart.statements.first() as? Jump
@@ -1247,7 +1257,7 @@ $repeatLabel    lda  $counterVar
         } else {
             val truePartIsJustBreak = stmt.truepart.statements.firstOrNull() is Break
             val elsePartIsJustBreak = stmt.elsepart.statements.firstOrNull() is Break
-            if(stmt.elsepart.containsNoCodeNorVars()) {
+            if(stmt.elsepart.containsNoCodeNorVars) {
                 if(truePartIsJustBreak) {
                     // branch with just a break (jump out of loop)
                     val instruction = branchInstruction(stmt.condition, false)
@@ -1291,8 +1301,8 @@ $repeatLabel    lda  $counterVar
         if(stmt.value!=null && stmt.type==VarDeclType.VAR && stmt.datatype in NumericDatatypes) {
             // generate an assignment statement to (re)initialize the variable's value.
             // if the vardecl is not in a subroutine however, we have to initialize it globally.
-            if(stmt.definingSubroutine()==null) {
-                val block = stmt.definingBlock()
+            if(stmt.definingSubroutine ==null) {
+                val block = stmt.definingBlock
                 var inits = blockLevelVarInits[block]
                 if(inits==null) {
                     inits = mutableSetOf()
@@ -1308,18 +1318,35 @@ $repeatLabel    lda  $counterVar
         }
     }
 
+    /**
+     * TODO: %asminclude and %asmbinary should be done earlier than code gen (-> put content into AST) ... (describe why?)
+     */
     private fun translate(stmt: Directive) {
         when(stmt.directive) {
             "%asminclude" -> {
-                val sourcecode = loadAsmIncludeFile(stmt.args[0].str!!, stmt.definingModule().source)
-                assemblyLines.add(sourcecode.trimEnd().trimStart('\n'))
+                // TODO: handle %asminclude with SourceCode
+                val includedName = stmt.args[0].str!!
+                if(stmt.definingModule.source is SourceCode.Generated)
+                    TODO("%asminclude inside non-library, non-filesystem module")
+                loadAsmIncludeFile(includedName, stmt.definingModule.source).fold(
+                    success = { assemblyLines.add(it.trimEnd().trimStart('\n')) },
+                    failure = { errors.err(it.toString(), stmt.position) }
+                )
             }
             "%asmbinary" -> {
+                val includedName = stmt.args[0].str!!
                 val offset = if(stmt.args.size>1) ", ${stmt.args[1].int}" else ""
                 val length = if(stmt.args.size>2) ", ${stmt.args[2].int}" else ""
-                val includedSourcePath = stmt.definingModule().source.resolveSibling(stmt.args[0].str)
-                val relPath = Paths.get("").relativize(includedSourcePath)
-                out("  .binary \"$relPath\" $offset $length")
+                if(stmt.definingModule.source is SourceCode.Generated)
+                    TODO("%asmbinary inside non-library, non-filesystem module")
+                val sourcePath = Path(stmt.definingModule.source.origin)
+                val includedPath = sourcePath.resolveSibling(includedName)
+                val pathForAssembler = outputDir // #54: 64tass needs the path *relative to the .asm file*
+                    .toAbsolutePath()
+                    .relativize(includedPath.toAbsolutePath())
+                    .normalize() // avoid assembler warnings (-Wportable; only some, not all)
+                    .toString().replace('\\', '/')
+                out("  .binary \"$pathForAssembler\" $offset $length")
             }
             "%breakpoint" -> {
                 val label = "_prog8_breakpoint_${breakpointLabels.size+1}"
@@ -1347,7 +1374,7 @@ $label              nop""")
 
     internal fun translate(ret: Return, withRts: Boolean=true) {
         ret.value?.let { returnvalue ->
-            val sub = ret.definingSubroutine()!!
+            val sub = ret.definingSubroutine!!
             val returnType = sub.returntypes.single()
             val returnReg = sub.asmReturnvaluesRegisters.single()
             if(returnReg.registerOrPair==null)
@@ -1436,22 +1463,22 @@ $label              nop""")
         if(pointerOffsetExpr is BinaryExpression && pointerOffsetExpr.operator=="+") {
             val leftDt = pointerOffsetExpr.left.inferType(program)
             val rightDt = pointerOffsetExpr.left.inferType(program)
-            if(leftDt.istype(DataType.UWORD) && rightDt.istype(DataType.UBYTE))
+            if(leftDt istype DataType.UWORD && rightDt istype DataType.UBYTE)
                 return Pair(pointerOffsetExpr.left, pointerOffsetExpr.right)
-            if(leftDt.istype(DataType.UBYTE) && rightDt.istype(DataType.UWORD))
+            if(leftDt istype DataType.UBYTE && rightDt istype DataType.UWORD)
                 return Pair(pointerOffsetExpr.right, pointerOffsetExpr.left)
-            if(leftDt.istype(DataType.UWORD) && rightDt.istype(DataType.UWORD)) {
+            if(leftDt istype DataType.UWORD && rightDt istype DataType.UWORD) {
                 // could be that the index was a constant numeric byte but converted to word, check that
                 val constIdx = pointerOffsetExpr.right.constValue(program)
                 if(constIdx!=null && constIdx.number.toInt()>=0 && constIdx.number.toInt()<=255) {
                     return Pair(pointerOffsetExpr.left, NumericLiteralValue(DataType.UBYTE, constIdx.number, constIdx.position))
                 }
-                // could be that the index was type casted into uword, check that
+                // could be that the index was typecasted into uword, check that
                 val rightTc = pointerOffsetExpr.right as? TypecastExpression
-                if(rightTc!=null && rightTc.expression.inferType(program).istype(DataType.UBYTE))
+                if(rightTc!=null && rightTc.expression.inferType(program) istype DataType.UBYTE)
                     return Pair(pointerOffsetExpr.left, rightTc.expression)
                 val leftTc = pointerOffsetExpr.left as? TypecastExpression
-                if(leftTc!=null && leftTc.expression.inferType(program).istype(DataType.UBYTE))
+                if(leftTc!=null && leftTc.expression.inferType(program) istype DataType.UBYTE)
                     return Pair(pointerOffsetExpr.right, leftTc.expression)
             }
 
@@ -1464,7 +1491,7 @@ $label              nop""")
 
         fun evalBytevalueWillClobberA(expr: Expression): Boolean {
             val dt = expr.inferType(program)
-            if(!dt.istype(DataType.UBYTE) && !dt.istype(DataType.BYTE))
+            if(dt isnot DataType.UBYTE && dt isnot DataType.BYTE)
                 return true
             return when(expr) {
                 is IdentifierReference -> false
@@ -1480,8 +1507,7 @@ $label              nop""")
             val ptrAndIndex = pointerViaIndexRegisterPossible(expr)
             if(ptrAndIndex!=null) {
                 val pointervar = ptrAndIndex.first as? IdentifierReference
-                val target = pointervar?.targetStatement(program)
-                when(target) {
+                when(pointervar?.targetStatement(program)) {
                     is Label -> {
                         assignExpressionToRegister(ptrAndIndex.second, RegisterOrPair.Y)
                         out("  lda  ${asmSymbolName(pointervar)},y")

compiler/src/prog8/compiler/target/cpu6502/codegen/AsmOptimizer.kt

@@ -74,7 +74,7 @@ private fun getLinesBy(lines: MutableList<String>, windowSize: Int) =
         lines.withIndex().filter { it.value.isNotBlank() && !it.value.trimStart().startsWith(';') }.windowed(windowSize, partialWindows = false)
 
 private fun optimizeCmpSequence(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
-    // the when statement (on bytes) generates a sequence of:
+    // when statement (on bytes) generates a sequence of:
     //	 lda  $ce01,x
     //	 cmp  #$20
     //	 beq  check_prog8_s72choice_32

compiler/src/prog8/compiler/target/cpu6502/codegen/BuiltinFunctionsAsmGen.kt

@@ -34,7 +34,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
         if(discardResult && resultToStack)
             throw AssemblyError("cannot both discard the result AND put it onto stack")
 
-        val sscope = (fcall as Node).definingSubroutine()
+        val sscope = (fcall as Node).definingSubroutine
 
         when (func.name) {
             "msb" -> funcMsb(fcall, resultToStack, resultRegister)
@@ -177,8 +177,8 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     private fun funcCmp(fcall: IFunctionCall) {
         val arg1 = fcall.args[0]
         val arg2 = fcall.args[1]
-        val dt1 = arg1.inferType(program).typeOrElse(DataType.UNDEFINED)
-        val dt2 = arg2.inferType(program).typeOrElse(DataType.UNDEFINED)
+        val dt1 = arg1.inferType(program).getOr(DataType.UNDEFINED)
+        val dt2 = arg2.inferType(program).getOr(DataType.UNDEFINED)
         if(dt1 in ByteDatatypes) {
             if(dt2 in ByteDatatypes) {
                 when (arg2) {
@@ -195,13 +195,13 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                             asmgen.assignExpressionToRegister(arg1, RegisterOrPair.A)
                             asmgen.out("  cmp  ${arg2.addressExpression.constValue(program)!!.number.toHex()}")
                         } else {
-                            asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_B1", DataType.UBYTE, (fcall as Node).definingSubroutine())
+                            asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_B1", DataType.UBYTE, (fcall as Node).definingSubroutine)
                             asmgen.assignExpressionToRegister(arg1, RegisterOrPair.A)
                             asmgen.out("  cmp  P8ZP_SCRATCH_B1")
                         }
                     }
                     else -> {
-                        asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_B1", DataType.UBYTE, (fcall as Node).definingSubroutine())
+                        asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_B1", DataType.UBYTE, (fcall as Node).definingSubroutine)
                         asmgen.assignExpressionToRegister(arg1, RegisterOrPair.A)
                         asmgen.out("  cmp  P8ZP_SCRATCH_B1")
                     }
@@ -229,7 +229,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 +""")
                     }
                     else -> {
-                        asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_W1", DataType.UWORD, (fcall as Node).definingSubroutine())
+                        asmgen.assignExpressionToVariable(arg2, "P8ZP_SCRATCH_W1", DataType.UWORD, (fcall as Node).definingSubroutine)
                         asmgen.assignExpressionToRegister(arg1, RegisterOrPair.AY)
                         asmgen.out("""
                             cpy  P8ZP_SCRATCH_W1+1
@@ -368,7 +368,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     private fun funcRor2(fcall: IFunctionCall) {
         val what = fcall.args.single()
         val dt = what.inferType(program)
-        when (dt.typeOrElse(DataType.UNDEFINED)) {
+        when (dt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 when (what) {
                     is ArrayIndexedExpression -> {
@@ -411,7 +411,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     private fun funcRor(fcall: IFunctionCall) {
         val what = fcall.args.single()
         val dt = what.inferType(program)
-        when (dt.typeOrElse(DataType.UNDEFINED)) {
+        when (dt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 when (what) {
                     is ArrayIndexedExpression -> {
@@ -426,7 +426,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                             val ptrAndIndex = asmgen.pointerViaIndexRegisterPossible(what.addressExpression)
                             if(ptrAndIndex!=null) {
                                 asmgen.assignExpressionToRegister(ptrAndIndex.second, RegisterOrPair.X)
-                                asmgen.saveRegisterLocal(CpuRegister.X, (fcall as FunctionCallStatement).definingSubroutine()!!)
+                                asmgen.saveRegisterLocal(CpuRegister.X, (fcall as FunctionCallStatement).definingSubroutine!!)
                                 asmgen.assignExpressionToRegister(ptrAndIndex.first, RegisterOrPair.AY)
                                 asmgen.restoreRegisterLocal(CpuRegister.X)
                                 asmgen.out("""
@@ -469,7 +469,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     private fun funcRol2(fcall: IFunctionCall) {
         val what = fcall.args.single()
         val dt = what.inferType(program)
-        when (dt.typeOrElse(DataType.UNDEFINED)) {
+        when (dt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 when (what) {
                     is ArrayIndexedExpression -> {
@@ -512,7 +512,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     private fun funcRol(fcall: IFunctionCall) {
         val what = fcall.args.single()
         val dt = what.inferType(program)
-        when (dt.typeOrElse(DataType.UNDEFINED)) {
+        when (dt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 when (what) {
                     is ArrayIndexedExpression -> {
@@ -527,7 +527,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                             val ptrAndIndex = asmgen.pointerViaIndexRegisterPossible(what.addressExpression)
                             if(ptrAndIndex!=null) {
                                 asmgen.assignExpressionToRegister(ptrAndIndex.second, RegisterOrPair.X)
-                                asmgen.saveRegisterLocal(CpuRegister.X, (fcall as FunctionCallStatement).definingSubroutine()!!)
+                                asmgen.saveRegisterLocal(CpuRegister.X, (fcall as FunctionCallStatement).definingSubroutine!!)
                                 asmgen.assignExpressionToRegister(ptrAndIndex.first, RegisterOrPair.AY)
                                 asmgen.restoreRegisterLocal(CpuRegister.X)
                                 asmgen.out("""
@@ -586,7 +586,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
         translateArguments(fcall.args, func, scope)
         val dt = fcall.args.single().inferType(program)
         if(resultToStack) {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.UBYTE -> asmgen.out("  jsr  prog8_lib.func_sign_ub_stack")
                 DataType.BYTE -> asmgen.out("  jsr  prog8_lib.func_sign_b_stack")
                 DataType.UWORD -> asmgen.out("  jsr  prog8_lib.func_sign_uw_stack")
@@ -595,7 +595,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                 else -> throw AssemblyError("weird type $dt")
             }
         } else {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.UBYTE -> asmgen.out("  jsr  prog8_lib.func_sign_ub_into_A")
                 DataType.BYTE -> asmgen.out("  jsr  prog8_lib.func_sign_b_into_A")
                 DataType.UWORD -> asmgen.out("  jsr  prog8_lib.func_sign_uw_into_A")
@@ -611,14 +611,14 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
         outputAddressAndLenghtOfArray(fcall.args[0])
         val dt = fcall.args.single().inferType(program)
         if(resultToStack) {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_B, DataType.ARRAY_UB, DataType.STR -> asmgen.out("  jsr  prog8_lib.func_${function.name}_b_stack")
                 DataType.ARRAY_UW, DataType.ARRAY_W -> asmgen.out("  jsr  prog8_lib.func_${function.name}_w_stack")
                 DataType.ARRAY_F -> asmgen.out("  jsr  floats.func_${function.name}_f_stack")
                 else -> throw AssemblyError("weird type $dt")
             }
         } else {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_B, DataType.ARRAY_UB, DataType.STR -> asmgen.out("  jsr  prog8_lib.func_${function.name}_b_into_A")
                 DataType.ARRAY_UW, DataType.ARRAY_W -> asmgen.out("  jsr  prog8_lib.func_${function.name}_w_into_A")
                 DataType.ARRAY_F -> asmgen.out("  jsr  floats.func_${function.name}_f_into_A")
@@ -632,7 +632,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
         outputAddressAndLenghtOfArray(fcall.args[0])
         val dt = fcall.args.single().inferType(program)
         if(resultToStack) {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_UB, DataType.STR -> asmgen.out("  jsr  prog8_lib.func_${function.name}_ub_stack")
                 DataType.ARRAY_B -> asmgen.out("  jsr  prog8_lib.func_${function.name}_b_stack")
                 DataType.ARRAY_UW -> asmgen.out("  jsr  prog8_lib.func_${function.name}_uw_stack")
@@ -641,7 +641,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                 else -> throw AssemblyError("weird type $dt")
             }
         } else {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_UB, DataType.STR -> {
                     asmgen.out("  jsr  prog8_lib.func_${function.name}_ub_into_A")
                     assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, scope, program, asmgen), CpuRegister.A)
@@ -671,7 +671,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
         outputAddressAndLenghtOfArray(fcall.args[0])
         val dt = fcall.args.single().inferType(program)
         if(resultToStack) {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_UB, DataType.STR -> asmgen.out("  jsr  prog8_lib.func_sum_ub_stack")
                 DataType.ARRAY_B -> asmgen.out("  jsr  prog8_lib.func_sum_b_stack")
                 DataType.ARRAY_UW -> asmgen.out("  jsr  prog8_lib.func_sum_uw_stack")
@@ -680,7 +680,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                 else -> throw AssemblyError("weird type $dt")
             }
         } else {
-            when (dt.typeOrElse(DataType.UNDEFINED)) {
+            when (dt.getOr(DataType.UNDEFINED)) {
                 DataType.ARRAY_UB, DataType.STR -> {
                     asmgen.out("  jsr  prog8_lib.func_sum_ub_into_AY")
                     assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, scope, program, asmgen), RegisterOrPair.AY)
@@ -715,11 +715,11 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
             val firstName = asmgen.asmVariableName(first)
             val secondName = asmgen.asmVariableName(second)
             val dt = first.inferType(program)
-            if(dt.istype(DataType.BYTE) || dt.istype(DataType.UBYTE)) {
+            if(dt istype DataType.BYTE || dt istype DataType.UBYTE) {
                 asmgen.out(" ldy  $firstName |  lda  $secondName |  sta  $firstName |  sty  $secondName")
                 return
             }
-            if(dt.istype(DataType.WORD) || dt.istype(DataType.UWORD)) {
+            if(dt istype DataType.WORD || dt istype DataType.UWORD) {
                 asmgen.out("""
                     ldy  $firstName
                     lda  $secondName
@@ -732,7 +732,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                 """)
                 return
             }
-            if(dt.istype(DataType.FLOAT)) {
+            if(dt istype DataType.FLOAT) {
                 asmgen.out("""
                     lda  #<$firstName
                     sta  P8ZP_SCRATCH_W1
@@ -750,7 +750,6 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 
         // optimized simple case: swap two memory locations
         if(first is DirectMemoryRead && second is DirectMemoryRead) {
-            // TODO optimize swap of two memread values with index, using the same pointer expression/variable, like swap(@(ptr+i1), @(ptr+i2))
             val addr1 = (first.addressExpression as? NumericLiteralValue)?.number?.toHex()
             val addr2 = (second.addressExpression as? NumericLiteralValue)?.number?.toHex()
             val name1 = if(first.addressExpression is IdentifierReference) asmgen.asmVariableName(first.addressExpression as IdentifierReference) else null
@@ -773,6 +772,50 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     asmgen.out("  ldy  $name1 |  lda  $name2 |  sta  $name1 |  sty  $name2")
                     return
                 }
+                addr1==null && addr2==null && name1==null && name2==null -> {
+                    val firstExpr = first.addressExpression as? BinaryExpression
+                    val secondExpr = second.addressExpression as? BinaryExpression
+                    if(firstExpr!=null && secondExpr!=null) {
+                        val pointerVariable = firstExpr.left as? IdentifierReference
+                        val firstOffset = firstExpr.right
+                        val secondOffset = secondExpr.right
+                        if(pointerVariable != null
+                            && pointerVariable isSameAs secondExpr.left
+                            && firstExpr.operator == "+" && secondExpr.operator == "+"
+                            && (firstOffset is NumericLiteralValue || firstOffset is IdentifierReference || firstOffset is TypecastExpression)
+                            && (secondOffset is NumericLiteralValue || secondOffset is IdentifierReference || secondOffset is TypecastExpression)
+                        ) {
+                            val pointerVar = firstExpr.left as IdentifierReference
+                            if(firstOffset is NumericLiteralValue && secondOffset is NumericLiteralValue) {
+                                if(firstOffset!=secondOffset) {
+                                    swapArrayValues(
+                                        DataType.UBYTE,
+                                        asmgen.asmVariableName(pointerVariable), firstOffset,
+                                        asmgen.asmVariableName(pointerVariable), secondOffset
+                                    )
+                                    return
+                                }
+                            } else if(firstOffset is TypecastExpression && secondOffset is TypecastExpression) {
+                                if(firstOffset.type in WordDatatypes && secondOffset.type in WordDatatypes) {
+                                    val firstOffsetVar = firstOffset.expression as? IdentifierReference
+                                    val secondOffsetVar = secondOffset.expression as? IdentifierReference
+                                    if(firstOffsetVar!=null && secondOffsetVar!=null) {
+                                        if(firstOffsetVar!=secondOffsetVar) {
+                                            swapArrayValues(
+                                                DataType.UBYTE,
+                                                asmgen.asmVariableName(pointerVariable), firstOffsetVar,
+                                                asmgen.asmVariableName(pointerVariable), secondOffsetVar
+                                            )
+                                            return
+                                        }
+                                    }
+                                }
+                            } else if(firstOffset is IdentifierReference || secondOffset is IdentifierReference) {
+                                throw AssemblyError("expected a typecast-to-word for index variable at ${firstOffset.position} and/or ${secondOffset.position}")
+                            }
+                        }
+                    }
+                }
             }
         }
 
@@ -782,7 +825,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
             val elementIDt = first.inferType(program)
             if(!elementIDt.isKnown)
                 throw AssemblyError("unknown dt")
-            val elementDt = elementIDt.typeOrElse(DataType.UNDEFINED)
+            val elementDt = elementIDt.getOr(DataType.UNDEFINED)
 
             val firstNum = first.indexer.indexExpr as? NumericLiteralValue
             val firstVar = first.indexer.indexExpr as? IdentifierReference
@@ -808,15 +851,14 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 
         fun targetFromExpr(expr: Expression, datatype: DataType): AsmAssignTarget {
             return when (expr) {
-                is IdentifierReference -> AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, datatype, expr.definingSubroutine(), variableAsmName = asmgen.asmVariableName(expr))
-                is ArrayIndexedExpression -> AsmAssignTarget(TargetStorageKind.ARRAY, program, asmgen, datatype, expr.definingSubroutine(), array = expr)
-                is DirectMemoryRead -> AsmAssignTarget(TargetStorageKind.MEMORY, program, asmgen, datatype, expr.definingSubroutine(), memory = DirectMemoryWrite(expr.addressExpression, expr.position))
+                is IdentifierReference -> AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, datatype, expr.definingSubroutine, variableAsmName = asmgen.asmVariableName(expr))
+                is ArrayIndexedExpression -> AsmAssignTarget(TargetStorageKind.ARRAY, program, asmgen, datatype, expr.definingSubroutine, array = expr)
+                is DirectMemoryRead -> AsmAssignTarget(TargetStorageKind.MEMORY, program, asmgen, datatype, expr.definingSubroutine, memory = DirectMemoryWrite(expr.addressExpression, expr.position))
                 else -> throw AssemblyError("invalid expression object $expr")
             }
         }
 
-        val datatype = first.inferType(program).typeOrElse(DataType.UNDEFINED)
-        when(datatype) {
+        when(val datatype: DataType = first.inferType(program).getOr(DataType.UNDEFINED)) {
             in ByteDatatypes, in WordDatatypes -> {
                 asmgen.assignExpressionToVariable(first, "P8ZP_SCRATCH_W1", datatype, null)
                 asmgen.assignExpressionToVariable(second, "P8ZP_SCRATCH_W2", datatype, null)
@@ -888,7 +930,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     sta  P8ZP_SCRATCH_W2
                     lda  #>(${arrayVarName2}+$index2)
                     sta  P8ZP_SCRATCH_W2+1
-                    jsr  floats.swap_floats
+                    jsr  floats.func_swap_f
                 """)
             }
             else -> throw AssemblyError("invalid aray elt type")
@@ -961,7 +1003,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     sta  P8ZP_SCRATCH_W2
                     bcc  +
                     inc  P8ZP_SCRATCH_W2+1
-+                   jsr  floats.swap_floats                                   
++                   jsr  floats.func_swap_f                                   
                 """)
             }
             else -> throw AssemblyError("invalid aray elt type")
@@ -1019,7 +1061,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     sta  P8ZP_SCRATCH_W1
                     bcc  +
                     inc  P8ZP_SCRATCH_W1+1
-+                   jsr  floats.swap_floats
++                   jsr  floats.func_swap_f
                 """)
             }
             else -> throw AssemblyError("invalid aray elt type")
@@ -1077,7 +1119,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     sta  P8ZP_SCRATCH_W2
                     lda  #>(${arrayVarName2}+$index2)
                     sta  P8ZP_SCRATCH_W2+1
-                    jsr  floats.swap_floats
+                    jsr  floats.func_swap_f
                 """)
             }
             else -> throw AssemblyError("invalid aray elt type")
@@ -1086,7 +1128,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 
     private fun funcAbs(fcall: IFunctionCall, func: FSignature, resultToStack: Boolean, resultRegister: RegisterOrPair?, scope: Subroutine?) {
         translateArguments(fcall.args, func, scope)
-        val dt = fcall.args.single().inferType(program).typeOrElse(DataType.UNDEFINED)
+        val dt = fcall.args.single().inferType(program).getOr(DataType.UNDEFINED)
         if(resultToStack) {
             when (dt) {
                 in ByteDatatypes -> asmgen.out("  jsr  prog8_lib.abs_b_stack")
@@ -1147,7 +1189,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                 val varname = asmgen.asmVariableName(addrExpr)
                 if(asmgen.isZpVar(addrExpr)) {
                     // pointervar is already in the zero page, no need to copy
-                    asmgen.saveRegisterLocal(CpuRegister.X, (fcall as Node).definingSubroutine()!!)
+                    asmgen.saveRegisterLocal(CpuRegister.X, (fcall as Node).definingSubroutine!!)
                     asmgen.assignExpressionToRegister(fcall.args[1], RegisterOrPair.AX)
                     if (asmgen.isTargetCpu(CpuType.CPU65c02)) {
                         asmgen.out("""
@@ -1172,7 +1214,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
                     val varname = asmgen.asmVariableName(addrExpr.left as IdentifierReference)
                     if(asmgen.isZpVar(addrExpr.left as IdentifierReference)) {
                         // pointervar is already in the zero page, no need to copy
-                        asmgen.saveRegisterLocal(CpuRegister.X, (fcall as Node).definingSubroutine()!!)
+                        asmgen.saveRegisterLocal(CpuRegister.X, (fcall as Node).definingSubroutine!!)
                         asmgen.assignExpressionToRegister(fcall.args[1], RegisterOrPair.AX)
                         val index = (addrExpr.right as NumericLiteralValue).number.toHex()
                         asmgen.out("""
@@ -1324,7 +1366,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 
     private fun funcMsb(fcall: IFunctionCall, resultToStack: Boolean, resultRegister: RegisterOrPair?) {
         val arg = fcall.args.single()
-        if (!arg.inferType(program).isWords())
+        if (!arg.inferType(program).isWords)
             throw AssemblyError("msb required word argument")
         if (arg is NumericLiteralValue)
             throw AssemblyError("msb(const) should have been const-folded away")
@@ -1368,7 +1410,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
 
     private fun funcLsb(fcall: IFunctionCall, resultToStack: Boolean, resultRegister: RegisterOrPair?) {
         val arg = fcall.args.single()
-        if (!arg.inferType(program).isWords())
+        if (!arg.inferType(program).isWords)
             throw AssemblyError("lsb required word argument")
         if (arg is NumericLiteralValue)
             throw AssemblyError("lsb(const) should have been const-folded away")
@@ -1432,7 +1474,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
     }
 
     private fun translateArguments(args: MutableList<Expression>, signature: FSignature, scope: Subroutine?) {
-        val callConv = signature.callConvention(args.map { it.inferType(program).typeOrElse(DataType.UNDEFINED) })
+        val callConv = signature.callConvention(args.map { it.inferType(program).getOr(DataType.UNDEFINED) })
 
         fun getSourceForFloat(value: Expression): AsmAssignSource {
             return when (value) {

compiler/src/prog8/compiler/target/cpu6502/codegen/ExpressionsAsmGen.kt

@@ -57,7 +57,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
         val idt = left.inferType(program)
         if(!idt.isKnown)
             throw AssemblyError("unknown dt")
-        val dt = idt.typeOrElse(DataType.UNDEFINED)
+        val dt = idt.getOr(DataType.UNDEFINED)
         when (operator) {
             "==" -> {
                 // if the left operand is an expression, and the right is 0, we can just evaluate that expression,
@@ -197,7 +197,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_less_f
                 beq  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -242,7 +242,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_lesseq_f
                 beq  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -287,7 +287,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_less_f
                 beq  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -332,7 +332,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_lesseq_f
                 beq  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -1339,7 +1339,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_equal_f
                 beq  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -1424,7 +1424,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
                 jsr  floats.vars_equal_f
                 bne  $jumpIfFalseLabel""")
         } else {
-            val subroutine = left.definingSubroutine()!!
+            val subroutine = left.definingSubroutine!!
             subroutine.asmGenInfo.usedFloatEvalResultVar1 = true
             asmgen.assignExpressionToVariable(right, subroutineFloatEvalResultVar1, DataType.FLOAT, subroutine)
             asmgen.assignExpressionToRegister(left, RegisterOrPair.FAC1)
@@ -1626,7 +1626,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
 
     private fun translateExpression(typecast: TypecastExpression) {
         translateExpression(typecast.expression)
-        when(typecast.expression.inferType(program).typeOrElse(DataType.UNDEFINED)) {
+        when(typecast.expression.inferType(program).getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 when(typecast.type) {
                     DataType.UBYTE, DataType.BYTE -> {}
@@ -1757,7 +1757,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
 
     private fun translateExpression(expr: IdentifierReference) {
         val varname = asmgen.asmVariableName(expr)
-        when(expr.inferType(program).typeOrElse(DataType.UNDEFINED)) {
+        when(expr.inferType(program).getOr(DataType.UNDEFINED)) {
             DataType.UBYTE, DataType.BYTE -> {
                 asmgen.out("  lda  $varname  |  sta  P8ESTACK_LO,x  |  dex")
             }
@@ -1781,8 +1781,8 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
         if(!leftIDt.isKnown || !rightIDt.isKnown)
             throw AssemblyError("can't infer type of both expression operands")
 
-        val leftDt = leftIDt.typeOrElse(DataType.UNDEFINED)
-        val rightDt = rightIDt.typeOrElse(DataType.UNDEFINED)
+        val leftDt = leftIDt.getOr(DataType.UNDEFINED)
+        val rightDt = rightIDt.getOr(DataType.UNDEFINED)
         // see if we can apply some optimized routines
         // TODO avoid using evaluation on stack everywhere
         when(expr.operator) {
@@ -2108,7 +2108,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
         val itype = expr.inferType(program)
         if(!itype.isKnown)
             throw AssemblyError("unknown dt")
-        val type = itype.typeOrElse(DataType.UNDEFINED)
+        val type = itype.getOr(DataType.UNDEFINED)
         when(expr.operator) {
             "+" -> {}
             "-" -> {
@@ -2146,7 +2146,7 @@ internal class ExpressionsAsmGen(private val program: Program, private val asmge
         val elementIDt = arrayExpr.inferType(program)
         if(!elementIDt.isKnown)
             throw AssemblyError("unknown dt")
-        val elementDt = elementIDt.typeOrElse(DataType.UNDEFINED)
+        val elementDt = elementIDt.getOr(DataType.UNDEFINED)
         val arrayVarName = asmgen.asmVariableName(arrayExpr.arrayvar)
         val constIndexNum = arrayExpr.indexer.constIndex()
         if(constIndexNum!=null) {

compiler/src/prog8/compiler/target/cpu6502/codegen/ForLoopsAsmGen.kt

@@ -9,6 +9,7 @@ import prog8.ast.expressions.RangeExpr
 import prog8.ast.statements.ForLoop
 import prog8.ast.toHex
 import prog8.compiler.AssemblyError
+import prog8.compiler.astprocessing.toConstantIntegerRange
 import kotlin.math.absoluteValue
 
 internal class ForLoopsAsmGen(private val program: Program, private val asmgen: AsmGen) {
@@ -19,15 +20,15 @@ internal class ForLoopsAsmGen(private val program: Program, private val asmgen:
             throw AssemblyError("unknown dt")
         when(stmt.iterable) {
             is RangeExpr -> {
-                val range = (stmt.iterable as RangeExpr).toConstantIntegerRange()
+                val range = (stmt.iterable as RangeExpr).toConstantIntegerRange(asmgen.options.compTarget)
                 if(range==null) {
-                    translateForOverNonconstRange(stmt, iterableDt.typeOrElse(DataType.UNDEFINED), stmt.iterable as RangeExpr)
+                    translateForOverNonconstRange(stmt, iterableDt.getOr(DataType.UNDEFINED), stmt.iterable as RangeExpr)
                 } else {
-                    translateForOverConstRange(stmt, iterableDt.typeOrElse(DataType.UNDEFINED), range)
+                    translateForOverConstRange(stmt, iterableDt.getOr(DataType.UNDEFINED), range)
                 }
             }
             is IdentifierReference -> {
-                translateForOverIterableVar(stmt, iterableDt.typeOrElse(DataType.UNDEFINED), stmt.iterable as IdentifierReference)
+                translateForOverIterableVar(stmt, iterableDt.getOr(DataType.UNDEFINED), stmt.iterable as IdentifierReference)
             }
             else -> throw AssemblyError("can't iterate over ${stmt.iterable.javaClass} - should have been replaced by a variable")
         }
@@ -588,5 +589,5 @@ $loopLabel""")
     }
 
     private fun assignLoopvar(stmt: ForLoop, range: RangeExpr) =
-        asmgen.assignExpressionToVariable(range.from, asmgen.asmVariableName(stmt.loopVar), stmt.loopVarDt(program).typeOrElse(DataType.UNDEFINED), stmt.definingSubroutine())
+        asmgen.assignExpressionToVariable(range.from, asmgen.asmVariableName(stmt.loopVar), stmt.loopVarDt(program).getOr(DataType.UNDEFINED), stmt.definingSubroutine)
 }

compiler/src/prog8/compiler/target/cpu6502/codegen/FunctionCallAsmGen.kt

@@ -5,7 +5,10 @@ import prog8.ast.Node
 import prog8.ast.Program
 import prog8.ast.base.*
 import prog8.ast.expressions.*
-import prog8.ast.statements.*
+import prog8.ast.statements.InlineAssembly
+import prog8.ast.statements.RegisterOrStatusflag
+import prog8.ast.statements.Subroutine
+import prog8.ast.statements.SubroutineParameter
 import prog8.compiler.AssemblyError
 import prog8.compiler.target.CpuType
 import prog8.compiler.target.cpu6502.codegen.assignment.AsmAssignSource
@@ -27,11 +30,10 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         val sub = stmt.target.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${stmt.target}")
         if(sub.shouldSaveX()) {
             val regSaveOnStack = sub.asmAddress==null       // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
-            val (keepAonEntry: Boolean, keepAonReturn: Boolean) = sub.shouldKeepA()
             if(regSaveOnStack)
-                asmgen.saveRegisterStack(CpuRegister.X, keepAonEntry)
+                asmgen.saveRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnEntry)
             else
-                asmgen.saveRegisterLocal(CpuRegister.X, (stmt as Node).definingSubroutine()!!)
+                asmgen.saveRegisterLocal(CpuRegister.X, (stmt as Node).definingSubroutine!!)
         }
     }
 
@@ -39,17 +41,15 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         val sub = stmt.target.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${stmt.target}")
         if(sub.shouldSaveX()) {
             val regSaveOnStack = sub.asmAddress==null       // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
-            val (keepAonEntry: Boolean, keepAonReturn: Boolean) = sub.shouldKeepA()
-
             if(regSaveOnStack)
-                asmgen.restoreRegisterStack(CpuRegister.X, keepAonReturn)
+                asmgen.restoreRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnReturn)
             else
                 asmgen.restoreRegisterLocal(CpuRegister.X)
         }
     }
 
     internal fun translateFunctionCall(stmt: IFunctionCall) {
-        // Output only the code to setup the parameters and perform the actual call
+        // Output only the code to set up the parameters and perform the actual call
         // NOTE: does NOT output the code to deal with the result values!
         // NOTE: does NOT output code to save/restore the X register for this call! Every caller should deal with this in their own way!!
         //       (you can use subroutine.shouldSaveX() and saveX()/restoreX() routines as a help for this)
@@ -118,16 +118,14 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
             // we do this by copying the subroutine's statements at the call site.
             // NOTE: *if* there is a return statement, it will be the only one, and the very last statement of the subroutine
             // (this condition has been enforced by an ast check earlier)
+
+            // note: for now, this is only reliably supported for asmsubs.
+            if(!sub.isAsmSubroutine)
+                throw AssemblyError("can only reliably inline asmsub routines at this time")
+
             asmgen.out("  \t; inlined routine follows: ${sub.name}")
-            val statements = sub.statements.filter { it !is ParameterVarDecl && it !is Directive }
-            statements.forEach {
-                if(it is Return) {
-                    asmgen.translate(it, false)     // don't use RTS for the inlined return statement
-                } else {
-                    if(!sub.inline || it !is VarDecl)
-                        asmgen.translate(it)
-                }
-            }
+            val assembly = sub.statements.single() as InlineAssembly
+            asmgen.translate(assembly)
             asmgen.out("  \t; inlined routine end: ${sub.name}")
         }
 
@@ -159,11 +157,11 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
                     argForCarry = argi
                 }
                 argi.value.second.statusflag != null -> throw AssemblyError("can only use Carry as status flag parameter")
-                argi.value.second.registerOrPair in setOf(RegisterOrPair.X, RegisterOrPair.AX, RegisterOrPair.XY) -> {
+                argi.value.second.registerOrPair in arrayOf(RegisterOrPair.X, RegisterOrPair.AX, RegisterOrPair.XY) -> {
                     require(argForXregister==null)
                     argForXregister = argi
                 }
-                argi.value.second.registerOrPair in setOf(RegisterOrPair.A, RegisterOrPair.AY) -> {
+                argi.value.second.registerOrPair in arrayOf(RegisterOrPair.A, RegisterOrPair.AY) -> {
                     require(argForAregister == null)
                     argForAregister = argi
                 }
@@ -254,7 +252,7 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         val valueIDt = value.inferType(program)
         if(!valueIDt.isKnown)
             throw AssemblyError("unknown dt")
-        val valueDt = valueIDt.typeOrElse(DataType.UNDEFINED)
+        val valueDt = valueIDt.getOr(DataType.UNDEFINED)
         if(!isArgumentTypeCompatible(valueDt, parameter.value.type))
             throw AssemblyError("argument type incompatible")
 
@@ -267,7 +265,7 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         val valueIDt = value.inferType(program)
         if(!valueIDt.isKnown)
             throw AssemblyError("unknown dt")
-        val valueDt = valueIDt.typeOrElse(DataType.UNDEFINED)
+        val valueDt = valueIDt.getOr(DataType.UNDEFINED)
         if(!isArgumentTypeCompatible(valueDt, parameter.value.type))
             throw AssemblyError("argument type incompatible")
 

compiler/src/prog8/compiler/target/cpu6502/codegen/PostIncrDecrAsmGen.kt

@@ -15,11 +15,11 @@ internal class PostIncrDecrAsmGen(private val program: Program, private val asmg
         val targetIdent = stmt.target.identifier
         val targetMemory = stmt.target.memoryAddress
         val targetArrayIdx = stmt.target.arrayindexed
-        val scope = stmt.definingSubroutine()
+        val scope = stmt.definingSubroutine
         when {
             targetIdent!=null -> {
                 val what = asmgen.asmVariableName(targetIdent)
-                when (stmt.target.inferType(program).typeOrElse(DataType.UNDEFINED)) {
+                when (stmt.target.inferType(program).getOr(DataType.UNDEFINED)) {
                     in ByteDatatypes -> asmgen.out(if (incr) "  inc  $what" else "  dec  $what")
                     in WordDatatypes -> {
                         if(incr)
@@ -65,7 +65,7 @@ internal class PostIncrDecrAsmGen(private val program: Program, private val asmg
             }
             targetArrayIdx!=null -> {
                 val asmArrayvarname = asmgen.asmVariableName(targetArrayIdx.arrayvar)
-                val elementDt = targetArrayIdx.inferType(program).typeOrElse(DataType.UNDEFINED)
+                val elementDt = targetArrayIdx.inferType(program).getOr(DataType.UNDEFINED)
                 val constIndex = targetArrayIdx.indexer.constIndex()
                 if(constIndex!=null) {
                     val indexValue = constIndex * program.memsizer.memorySize(elementDt)

compiler/src/prog8/compiler/target/cpu6502/codegen/assignment/AsmAssignment.kt

@@ -59,11 +59,11 @@ internal class AsmAssignTarget(val kind: TargetStorageKind,
             val idt = inferType(program)
             if(!idt.isKnown)
                 throw AssemblyError("unknown dt")
-            val dt = idt.typeOrElse(DataType.UNDEFINED)
+            val dt = idt.getOr(DataType.UNDEFINED)
             when {
-                identifier != null -> AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, dt, assign.definingSubroutine(), variableAsmName = asmgen.asmVariableName(identifier!!), origAstTarget =  this)
-                arrayindexed != null -> AsmAssignTarget(TargetStorageKind.ARRAY, program, asmgen, dt, assign.definingSubroutine(), array = arrayindexed, origAstTarget =  this)
-                memoryAddress != null -> AsmAssignTarget(TargetStorageKind.MEMORY, program, asmgen, dt, assign.definingSubroutine(), memory =  memoryAddress, origAstTarget =  this)
+                identifier != null -> AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, dt, assign.definingSubroutine, variableAsmName = asmgen.asmVariableName(identifier!!), origAstTarget =  this)
+                arrayindexed != null -> AsmAssignTarget(TargetStorageKind.ARRAY, program, asmgen, dt, assign.definingSubroutine, array = arrayindexed, origAstTarget =  this)
+                memoryAddress != null -> AsmAssignTarget(TargetStorageKind.MEMORY, program, asmgen, dt, assign.definingSubroutine, memory =  memoryAddress, origAstTarget =  this)
                 else -> throw AssemblyError("weird target")
             }
         }
@@ -132,7 +132,7 @@ internal class AsmAssignSource(val kind: SourceStorageKind,
                 is StringLiteralValue -> throw AssemblyError("string literal value should not occur anymore for asm generation")
                 is ArrayLiteralValue -> throw AssemblyError("array literal value should not occur anymore for asm generation")
                 is IdentifierReference -> {
-                    val dt = value.inferType(program).typeOrElse(DataType.UNDEFINED)
+                    val dt = value.inferType(program).getOr(DataType.UNDEFINED)
                     val varName=asmgen.asmVariableName(value)
                     // special case: "cx16.r[0-15]" are 16-bits virtual registers of the commander X16 system
                     if(dt == DataType.UWORD && varName.lowercase().startsWith("cx16.r")) {
@@ -147,7 +147,7 @@ internal class AsmAssignSource(val kind: SourceStorageKind,
                     AsmAssignSource(SourceStorageKind.MEMORY, program, asmgen, DataType.UBYTE, memory = value)
                 }
                 is ArrayIndexedExpression -> {
-                    val dt = value.inferType(program).typeOrElse(DataType.UNDEFINED)
+                    val dt = value.inferType(program).getOr(DataType.UNDEFINED)
                     AsmAssignSource(SourceStorageKind.ARRAY, program, asmgen, dt, array = value)
                 }
                 is FunctionCall -> {
@@ -162,7 +162,7 @@ internal class AsmAssignSource(val kind: SourceStorageKind,
                             val returnType = value.inferType(program)
                             if(!returnType.isKnown)
                                 throw AssemblyError("unknown dt")
-                            AsmAssignSource(SourceStorageKind.EXPRESSION, program, asmgen, returnType.typeOrElse(DataType.UNDEFINED), expression = value)
+                            AsmAssignSource(SourceStorageKind.EXPRESSION, program, asmgen, returnType.getOr(DataType.UNDEFINED), expression = value)
                         }
                         else -> {
                             throw AssemblyError("weird call")
@@ -173,7 +173,7 @@ internal class AsmAssignSource(val kind: SourceStorageKind,
                     val dt = value.inferType(program)
                     if(!dt.isKnown)
                         throw AssemblyError("unknown dt")
-                    AsmAssignSource(SourceStorageKind.EXPRESSION, program, asmgen, dt.typeOrElse(DataType.UNDEFINED), expression = value)
+                    AsmAssignSource(SourceStorageKind.EXPRESSION, program, asmgen, dt.getOr(DataType.UNDEFINED), expression = value)
                 }
             }
         }
@@ -205,7 +205,7 @@ internal class AsmAssignment(val source: AsmAssignSource,
                              val position: Position) {
 
     init {
-        if(target.register !in setOf(RegisterOrPair.XY, RegisterOrPair.AX, RegisterOrPair.AY))
+        if(target.register !in arrayOf(RegisterOrPair.XY, RegisterOrPair.AX, RegisterOrPair.AY))
             require(source.datatype != DataType.UNDEFINED) { "must not be placeholder/undefined datatype" }
             require(memsizer.memorySize(source.datatype) <= memsizer.memorySize(target.datatype)) {
                 "source storage size must be less or equal to target datatype storage size"

compiler/src/prog8/compiler/target/cpu6502/codegen/assignment/AssignmentAsmGen.kt

@@ -217,7 +217,7 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
                                     val returntype = builtinFunctionReturnType(sub.name, value.args, program)
                                     if(!returntype.isKnown)
                                         throw AssemblyError("unknown dt")
-                                    when(returntype.typeOrElse(DataType.UNDEFINED)) {
+                                    when(returntype.getOr(DataType.UNDEFINED)) {
                                         in ByteDatatypes -> assignRegisterByte(assign.target, CpuRegister.A)            // function's byte result is in A
                                         in WordDatatypes -> assignRegisterpairWord(assign.target, RegisterOrPair.AY)    // function's word result is in AY
                                         DataType.STR -> {
@@ -299,7 +299,7 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
         val valueIDt = value.inferType(program)
         if(!valueIDt.isKnown)
             throw AssemblyError("unknown dt")
-        val valueDt = valueIDt.typeOrElse(DataType.UNDEFINED)
+        val valueDt = valueIDt.getOr(DataType.UNDEFINED)
         if(valueDt==targetDt)
             throw AssemblyError("type cast to identical dt should have been removed")
 
@@ -398,7 +398,7 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
                 RegisterOrPair.A,
                 RegisterOrPair.X,
                 RegisterOrPair.Y -> {
-                    // 'cast' a ubyte value to a byte register; no cast needed at all
+                    // 'cast' an ubyte value to a byte register; no cast needed at all
                     return assignExpressionToRegister(value, target.register)
                 }
                 RegisterOrPair.AX,
@@ -1359,8 +1359,10 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
     }
 
     internal fun assignRegisterByte(target: AsmAssignTarget, register: CpuRegister) {
-        // we make an exception in the type check for assigning something to a cx16 virtual register
-        if(target.register !in Cx16VirtualRegisters) {
+        // we make an exception in the type check for assigning something to a cx16 virtual register, or a register pair
+        // these will be correctly typecasted from a byte to a word value
+        if(target.register !in Cx16VirtualRegisters &&
+            target.register!=RegisterOrPair.AX && target.register!=RegisterOrPair.AY && target.register!=RegisterOrPair.XY) {
             if(target.kind==TargetStorageKind.VARIABLE) {
                 val parts = target.asmVarname.split('.')
                 if (parts.size != 2 || parts[0] != "cx16")

compiler/src/prog8/compiler/target/cpu6502/codegen/assignment/AugmentableAssignmentAsmGen.kt

@@ -25,7 +25,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                 val itype = value.inferType(program)
                 if(!itype.isKnown)
                     throw AssemblyError("unknown dt")
-                val type = itype.typeOrElse(DataType.UNDEFINED)
+                val type = itype.getOr(DataType.UNDEFINED)
                 when (value.operator) {
                     "+" -> {}
                     "-" -> inplaceNegate(assign.target, type)
@@ -280,7 +280,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
             val childIDt = value.expression.inferType(program)
             if(!childIDt.isKnown)
                 throw AssemblyError("unknown dt")
-            val childDt = childIDt.typeOrElse(DataType.UNDEFINED)
+            val childDt = childIDt.getOr(DataType.UNDEFINED)
             if (value.type!=DataType.FLOAT && (value.type.equalsSize(childDt) || value.type.largerThan(childDt))) {
                 // this typecast is redundant here; the rest of the code knows how to deal with the uncasted value.
                 // (works for integer types, not for float.)
@@ -293,7 +293,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 
     private fun inplaceModification_byte_value_to_pointer(pointervar: IdentifierReference, operator: String, value: Expression) {
         asmgen.assignExpressionToVariable(value, "P8ZP_SCRATCH_B1", DataType.UBYTE, null)
-        val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
         when (operator) {
             // note: ** (power) operator requires floats.
             "+" -> asmgen.out("  clc |  adc  P8ZP_SCRATCH_B1")
@@ -324,15 +323,13 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
             "^", "xor" -> asmgen.out(" eor  P8ZP_SCRATCH_B1")
             else -> throw AssemblyError("invalid operator for in-place modification $operator")
         }
-        if(ptrOnZp)
-            asmgen.out("  sta  ($sourceName),y")
-        else
-            asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+        val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+        asmgen.out("  sta  ($sourceName),y")
     }
 
     private fun inplaceModification_byte_variable_to_pointer(pointervar: IdentifierReference, operator: String, value: IdentifierReference) {
         val otherName = asmgen.asmVariableName(value)
-        val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+        val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
 
         when (operator) {
             // note: ** (power) operator requires floats.
@@ -364,105 +361,72 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
             "^", "xor" -> asmgen.out(" eor  $otherName")
             else -> throw AssemblyError("invalid operator for in-place modification $operator")
         }
-        if(ptrOnZp)
-            asmgen.out("  sta  ($sourceName),y")
-        else
-            asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+        asmgen.out("  sta  ($sourceName),y")
     }
 
     private fun inplaceModification_byte_litval_to_pointer(pointervar: IdentifierReference, operator: String, value: Int) {
         when (operator) {
             // note: ** (power) operator requires floats.
             "+" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
-                asmgen.out(" clc |  adc  #$value")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+                asmgen.out("  clc |  adc  #$value")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "-" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
-                asmgen.out(" sec |  sbc  #$value")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+                asmgen.out("  sec |  sbc  #$value")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "*" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 if(value in asmgen.optimizedByteMultiplications)
                     asmgen.out("  jsr  math.mul_byte_${value}")
                 else
                     asmgen.out("  ldy  #$value |  jsr  math.multiply_bytes |  ldy  #0")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "/" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 if(value==0)
                     throw AssemblyError("division by zero")
                 asmgen.out("  ldy  #$value |  jsr  math.divmod_ub_asm |  tya |  ldy  #0")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "%" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 if(value==0)
                     throw AssemblyError("division by zero")
                 asmgen.out("  ldy  #$value |  jsr  math.divmod_ub_asm |  ldy  #0")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "<<" -> {
                 if (value > 0) {
-                    val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+                    val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                     repeat(value) { asmgen.out(" asl  a") }
-                    if(ptrOnZp)
-                        asmgen.out("  sta  ($sourceName),y")
-                    else
-                        asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                    asmgen.out("  sta  ($sourceName),y")
                 }
             }
             ">>" -> {
                 if (value > 0) {
-                    val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
+                    val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                     repeat(value) { asmgen.out(" lsr  a") }
-                    if(ptrOnZp)
-                        asmgen.out("  sta  ($sourceName),y")
-                    else
-                        asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                    asmgen.out("  sta  ($sourceName),y")
                 }
             }
             "&", "and" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
-                asmgen.out(" and  #$value")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+                asmgen.out("  and  #$value")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "|", "or" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
-                asmgen.out(" ora  #$value")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+                asmgen.out("  ora  #$value")
+                asmgen.out("  sta  ($sourceName),y")
             }
             "^", "xor" -> {
-                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(pointervar)
-                asmgen.out(" eor  #$value")
-                if(ptrOnZp)
-                    asmgen.out("  sta  ($sourceName),y")
-                else
-                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
+                asmgen.out("  eor  #$value")
+                asmgen.out("  sta  ($sourceName),y")
             }
             else -> throw AssemblyError("invalid operator for in-place modification $operator")
         }
@@ -1010,8 +974,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 
     private fun inplaceModification_word_variable_to_variable(name: String, dt: DataType, operator: String, ident: IdentifierReference) {
         val otherName = asmgen.asmVariableName(ident)
-        val valueDt = ident.targetVarDecl(program)!!.datatype
-        when (valueDt) {
+        when (val valueDt = ident.targetVarDecl(program)!!.datatype) {
             in ByteDatatypes -> {
                 // the other variable is a BYTE type so optimize for that
                 when (operator) {
@@ -1255,7 +1218,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
         val valueiDt = value.inferType(program)
         if(!valueiDt.isKnown)
             throw AssemblyError("unknown dt")
-        val valueDt = valueiDt.typeOrElse(DataType.UNDEFINED)
+        val valueDt = valueiDt.getOr(DataType.UNDEFINED)
 
         fun multiplyVarByWordInAY() {
             asmgen.out("""
@@ -1697,7 +1660,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
         if (innerCastDt == null) {
             // simple typecast where the value is the target
             when (target.datatype) {
-                DataType.UBYTE, DataType.BYTE -> { /* byte target can't be casted to anything else at all */ }
+                DataType.UBYTE, DataType.BYTE -> { /* byte target can't be typecasted to anything else at all */ }
                 DataType.UWORD, DataType.WORD -> {
                     when (outerCastDt) {
                         DataType.UBYTE, DataType.BYTE -> {
@@ -1767,15 +1730,12 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                     sta  $addr""")
                             }
                             is IdentifierReference -> {
-                                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(mem.addressExpression as IdentifierReference)
+                                val sourceName = asmgen.loadByteFromPointerIntoA(mem.addressExpression as IdentifierReference)
                                 asmgen.out("""
                                     beq  +
                                     lda  #1
 +                                   eor  #1""")
-                                if(ptrOnZp)
-                                    asmgen.out("  sta  ($sourceName),y")
-                                else
-                                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                                asmgen.out("  sta  ($sourceName),y")
                             }
                             else -> {
                                 asmgen.assignExpressionToVariable(mem.addressExpression, "P8ZP_SCRATCH_W2", DataType.UWORD, target.scope)
@@ -1838,12 +1798,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                     sta  $addr""")
                             }
                             is IdentifierReference -> {
-                                val (ptrOnZp, sourceName) = asmgen.loadByteFromPointerIntoA(memory.addressExpression as IdentifierReference)
+                                val sourceName = asmgen.loadByteFromPointerIntoA(memory.addressExpression as IdentifierReference)
                                 asmgen.out("  eor  #255")
-                                if(ptrOnZp)
-                                    asmgen.out("  sta  ($sourceName),y")
-                                else
-                                    asmgen.out("  sta  (P8ZP_SCRATCH_W1),y")
+                                asmgen.out("  sta  ($sourceName),y")
                             }
                             else -> {
                                 asmgen.assignExpressionToVariable(memory.addressExpression, "P8ZP_SCRATCH_W2", DataType.UWORD, target.scope)

compiler/src/prog8/compiler/target/cx16/CX16MachineDefinition.kt

@@ -4,7 +4,9 @@ import prog8.compiler.*
 import prog8.compiler.target.CpuType
 import prog8.compiler.target.IMachineDefinition
 import prog8.compiler.target.c64.C64MachineDefinition
+import prog8.compiler.target.cbm.viceMonListPostfix
 import java.io.IOException
+import java.nio.file.Path
 
 internal object CX16MachineDefinition: IMachineDefinition {
 
@@ -32,10 +34,28 @@ internal object CX16MachineDefinition: IMachineDefinition {
             emptyList()
     }
 
-    override fun launchEmulator(programName: String) {
-        for(emulator in listOf("x16emu")) {
+    override fun launchEmulator(selectedEmulator: Int, programNameWithPath: Path) {
+        val emulatorName: String
+        val extraArgs: List<String>
+
+        when(selectedEmulator) {
+            1 -> {
+                emulatorName = "x16emu"
+                extraArgs = emptyList()
+            }
+            2 -> {
+                emulatorName = "box16"
+                extraArgs = listOf("-sym", "${programNameWithPath}.$viceMonListPostfix")
+            }
+            else -> {
+                System.err.println("Cx16 target only supports x16emu and box16 emulators.")
+                return
+            }
+        }
+
+        for(emulator in listOf(emulatorName)) {
             println("\nStarting Commander X16 emulator $emulator...")
-            val cmdline = listOf(emulator, "-scale", "2", "-run", "-prg", "$programName.prg")
+            val cmdline = listOf(emulator, "-scale", "2", "-run", "-prg", "${programNameWithPath}.prg") + extraArgs
             val processb = ProcessBuilder(cmdline).inheritIO()
             val process: Process
             try {
@@ -77,7 +97,7 @@ internal object CX16MachineDefinition: IMachineDefinition {
 
 
         init {
-            if (options.floats && options.zeropage !in setOf(ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
+            if (options.floats && options.zeropage !in arrayOf(ZeropageType.BASICSAFE, ZeropageType.DONTUSE ))
                 throw CompilerException("when floats are enabled, zero page type should be 'basicsafe' or 'dontuse'")
 
             // the addresses 0x02 to 0x21 (inclusive) are taken for sixteen virtual 16-bit api registers.

compiler/src/prog8/optimizer/BinExprSplitter.kt

@@ -9,6 +9,7 @@ import prog8.ast.statements.AssignTarget
 import prog8.ast.statements.Assignment
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
+import prog8.compiler.astprocessing.isInRegularRAMof
 import prog8.compiler.target.ICompilationTarget
 
 
@@ -54,7 +55,7 @@ X =      BinExpr                                    X   =   LeftExpr
 
 
  */
-            if(binExpr.operator in augmentAssignmentOperators && isSimpleTarget(assignment.target, program)) {
+            if(binExpr.operator in augmentAssignmentOperators && isSimpleTarget(assignment.target)) {
                 if(assignment.target isSameAs binExpr.left || assignment.target isSameAs binExpr.right)
                     return noModifications
 
@@ -77,9 +78,9 @@ X =      BinExpr                                    X   =   LeftExpr
         return noModifications
     }
 
-    private fun isSimpleTarget(target: AssignTarget, program: Program) =
+    private fun isSimpleTarget(target: AssignTarget) =
             if (target.identifier!=null || target.memoryAddress!=null)
-                compTarget.isInRegularRAM(target, program)
+                target.isInRegularRAMof(compTarget.machine)
             else
                 false
 

compiler/src/prog8/optimizer/CallGraph.kt

@@ -27,30 +27,30 @@ class CallGraph(private val program: Program) : IAstVisitor {
     }
 
     private val usedSubroutines: Set<Subroutine> by lazy {
-        calledBy.keys + program.entrypoint()
+        calledBy.keys + program.entrypoint
     }
 
     private val usedBlocks: Set<Block> by lazy {
-        val blocksFromSubroutines = usedSubroutines.map { it.definingBlock() }
-        val blocksFromLibraries = program.allBlocks().filter { it.isInLibrary }
+        val blocksFromSubroutines = usedSubroutines.map { it.definingBlock }
+        val blocksFromLibraries = program.allBlocks.filter { it.isInLibrary }
         val used = mutableSetOf<Block>()
 
         allIdentifiersAndTargets.forEach {
-            if(it.key.first.definingBlock() in blocksFromSubroutines) {
-                val target = it.value.definingBlock()
+            if(it.key.first.definingBlock in blocksFromSubroutines) {
+                val target = it.value.definingBlock
                 used.add(target)
             }
         }
 
-        used + blocksFromLibraries + program.entrypoint().definingBlock()
+        used + blocksFromLibraries + program.entrypoint.definingBlock
     }
 
     private val usedModules: Set<Module> by lazy {
-        usedBlocks.map { it.definingModule() }.toSet()
+        usedBlocks.map { it.definingModule }.toSet()
     }
 
     override fun visit(directive: Directive) {
-        val thisModule = directive.definingModule()
+        val thisModule = directive.definingModule
         if (directive.directive == "%import") {
             val importedModule: Module = program.modules.single { it.name == directive.args[0].name }
             imports[thisModule] = imports.getValue(thisModule) + importedModule
@@ -63,7 +63,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
     override fun visit(functionCall: FunctionCall) {
         val otherSub = functionCall.target.targetSubroutine(program)
         if (otherSub != null) {
-            functionCall.definingSubroutine()?.let { thisSub ->
+            functionCall.definingSubroutine?.let { thisSub ->
                 calls[thisSub] = calls.getValue(thisSub) + otherSub
                 calledBy[otherSub] = calledBy.getValue(otherSub) + functionCall
             }
@@ -74,7 +74,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
     override fun visit(functionCallStatement: FunctionCallStatement) {
         val otherSub = functionCallStatement.target.targetSubroutine(program)
         if (otherSub != null) {
-            functionCallStatement.definingSubroutine()?.let { thisSub ->
+            functionCallStatement.definingSubroutine?.let { thisSub ->
                 calls[thisSub] = calls.getValue(thisSub) + otherSub
                 calledBy[otherSub] = calledBy.getValue(otherSub) + functionCallStatement
             }
@@ -85,7 +85,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
     override fun visit(addressOf: AddressOf) {
         val otherSub = addressOf.identifier.targetSubroutine(program)
         if(otherSub!=null) {
-            addressOf.definingSubroutine()?.let { thisSub ->
+            addressOf.definingSubroutine?.let { thisSub ->
                 calls[thisSub] = calls.getValue(thisSub) + otherSub
                 calledBy[otherSub] = calledBy.getValue(otherSub) + thisSub
             }
@@ -96,7 +96,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
     override fun visit(jump: Jump) {
         val otherSub = jump.identifier?.targetSubroutine(program)
         if (otherSub != null) {
-            jump.definingSubroutine()?.let { thisSub ->
+            jump.definingSubroutine?.let { thisSub ->
                 calls[thisSub] = calls.getValue(thisSub) + otherSub
                 calledBy[otherSub] = calledBy.getValue(otherSub) + jump
             }
@@ -177,7 +177,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
         if(decl.type!=VarDeclType.VAR || decl.autogeneratedDontRemove || decl.sharedWithAsm)
             return false
 
-        if(decl.definingBlock() !in usedBlocks)
+        if(decl.definingBlock !in usedBlocks)
             return false
 
         val allReferencedVardecls = allIdentifiersAndTargets.filter { it.value is VarDecl }.map { it.value }.toSet()

compiler/src/prog8/optimizer/ConstantFoldingOptimizer.kt

@@ -9,11 +9,10 @@ import prog8.ast.statements.ForLoop
 import prog8.ast.statements.VarDecl
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
-import prog8.compiler.target.ICompilationTarget
 import kotlin.math.pow
 
 
-internal class ConstantFoldingOptimizer(private val program: Program, private val compTarget: ICompilationTarget) : AstWalker() {
+internal class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
 
     override fun before(memread: DirectMemoryRead, parent: Node): Iterable<IAstModification> {
         // @( &thing )  -->  thing
@@ -106,7 +105,7 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
             // optimize various simple cases of ** :
             //  optimize away 1 ** x into just 1 and 0 ** x into just 0
             //  optimize 2 ** x into (1<<x)  if both operands are integer.
-            val leftDt = leftconst.inferType(program).typeOrElse(DataType.UNDEFINED)
+            val leftDt = leftconst.inferType(program).getOr(DataType.UNDEFINED)
             when (leftconst.number.toDouble()) {
                 0.0 -> {
                     val value = NumericLiteralValue(leftDt, 0, expr.position)
@@ -121,11 +120,11 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
                         val value = NumericLiteralValue(leftDt, 2.0.pow(rightconst.number.toDouble()), expr.position)
                         modifications += IAstModification.ReplaceNode(expr, value, parent)
                     } else {
-                        val rightDt = expr.right.inferType(program).typeOrElse(DataType.UNDEFINED)
+                        val rightDt = expr.right.inferType(program).getOr(DataType.UNDEFINED)
                         if(leftDt in IntegerDatatypes && rightDt in IntegerDatatypes) {
                             val targetDt =
                                 when (parent) {
-                                    is Assignment -> parent.target.inferType(program).typeOrElse(DataType.UNDEFINED)
+                                    is Assignment -> parent.target.inferType(program).getOr(DataType.UNDEFINED)
                                     is VarDecl -> parent.datatype
                                     else -> leftDt
                                 }
@@ -138,7 +137,7 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
             }
         }
 
-        if(expr.inferType(program).istype(DataType.FLOAT)) {
+        if(expr.inferType(program) istype DataType.FLOAT) {
             val subExpr: BinaryExpression? = when {
                 leftconst != null -> expr.right as? BinaryExpression
                 rightconst != null -> expr.left as? BinaryExpression
@@ -187,7 +186,7 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
         } else {
             val arrayDt = array.guessDatatype(program)
             if (arrayDt.isKnown) {
-                val newArray = array.cast(arrayDt.typeOrElse(DataType.UNDEFINED))
+                val newArray = array.cast(arrayDt.getOr(DataType.UNDEFINED))
                 if (newArray != null && newArray != array)
                     return listOf(IAstModification.ReplaceNode(array, newArray, parent))
             }
@@ -223,7 +222,7 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
                     range.step
                 }
 
-            return RangeExpr(fromCast.valueOrZero(), toCast.valueOrZero(), newStep, compTarget, range.position)
+            return RangeExpr(fromCast.valueOrZero(), toCast.valueOrZero(), newStep, range.position)
         }
 
         // adjust the datatype of a range expression in for loops to the loop variable.
@@ -278,7 +277,7 @@ internal class ConstantFoldingOptimizer(private val program: Program, private va
         val numval = decl.value as? NumericLiteralValue
         if(decl.type== VarDeclType.CONST && numval!=null) {
             val valueDt = numval.inferType(program)
-            if(!valueDt.istype(decl.datatype)) {
+            if(valueDt isnot decl.datatype) {
                 val cast = numval.cast(decl.datatype)
                 if(cast.isValid)
                     return listOf(IAstModification.ReplaceNode(numval, cast.valueOrZero(), decl))

compiler/src/prog8/optimizer/ConstantIdentifierReplacer.kt

@@ -9,16 +9,19 @@ import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.compiler.IErrorReporter
+import prog8.compiler.astprocessing.size
+import prog8.compiler.astprocessing.toConstantIntegerRange
 import prog8.compiler.target.ICompilationTarget
 
 // Fix up the literal value's type to match that of the vardecl
+//   (also check range literal operands types before they get expanded into arrays for instance)
 internal class VarConstantValueTypeAdjuster(private val program: Program, private val errors: IErrorReporter) : AstWalker() {
 
     override fun after(decl: VarDecl, parent: Node): Iterable<IAstModification> {
         try {
             val declConstValue = decl.value?.constValue(program)
             if(declConstValue!=null && (decl.type==VarDeclType.VAR || decl.type==VarDeclType.CONST)
-                && !declConstValue.inferType(program).istype(decl.datatype)) {
+                && declConstValue.inferType(program) isnot decl.datatype) {
                 // cast the numeric literal to the appropriate datatype of the variable
                 val cast = declConstValue.cast(decl.datatype)
                 if(cast.isValid)
@@ -30,7 +33,7 @@ internal class VarConstantValueTypeAdjuster(private val program: Program, privat
 
         // move vardecl to the containing subroutine and add initialization assignment in its place if needed
         if(decl.type == VarDeclType.VAR && decl.datatype in NumericDatatypes) {
-            val subroutine = decl.definingSubroutine() as? INameScope
+            val subroutine = decl.definingSubroutine as? INameScope
             if(subroutine!=null && subroutine!==parent) {
                 val declValue = decl.value
                 decl.value = null
@@ -52,6 +55,35 @@ internal class VarConstantValueTypeAdjuster(private val program: Program, privat
         }
         return noModifications
     }
+
+    override fun after(range: RangeExpr, parent: Node): Iterable<IAstModification> {
+        val from = range.from.constValue(program)?.number?.toDouble()
+        val to = range.to.constValue(program)?.number?.toDouble()
+        val step = range.step.constValue(program)?.number?.toDouble()
+
+        if(from==null) {
+            if(!range.from.inferType(program).isInteger)
+                errors.err("range expression from value must be integer", range.from.position)
+        } else if(from-from.toInt()>0) {
+            errors.err("range expression from value must be integer", range.from.position)
+        }
+
+        if(to==null) {
+            if(!range.to.inferType(program).isInteger)
+                errors.err("range expression to value must be integer", range.to.position)
+        } else if(to-to.toInt()>0) {
+            errors.err("range expression to value must be integer", range.to.position)
+        }
+
+        if(step==null) {
+            if(!range.step.inferType(program).isInteger)
+                errors.err("range expression step value must be integer", range.step.position)
+        } else if(step-step.toInt()>0) {
+            errors.err("range expression step value must be integer", range.step.position)
+        }
+
+        return noModifications
+    }
 }
 
 
@@ -124,16 +156,15 @@ internal class ConstantIdentifierReplacer(private val program: Program, private
                     }
                 }
                 DataType.ARRAY_UB, DataType.ARRAY_B, DataType.ARRAY_UW, DataType.ARRAY_W -> {
-                    val numericLv = decl.value as? NumericLiteralValue
                     val rangeExpr = decl.value as? RangeExpr
                     if(rangeExpr!=null) {
                         // convert the initializer range expression to an actual array
                         val declArraySize = decl.arraysize?.constIndex()
-                        if(declArraySize!=null && declArraySize!=rangeExpr.size())
+                        if(declArraySize!=null && declArraySize!=rangeExpr.size(compTarget))
                             errors.err("range expression size doesn't match declared array size", decl.value?.position!!)
-                        val constRange = rangeExpr.toConstantIntegerRange()
+                        val constRange = rangeExpr.toConstantIntegerRange(compTarget)
                         if(constRange!=null) {
-                            val eltType = rangeExpr.inferType(program).typeOrElse(DataType.UBYTE)
+                            val eltType = rangeExpr.inferType(program).getOr(DataType.UBYTE)
                             val newValue = if(eltType in ByteDatatypes) {
                                 ArrayLiteralValue(InferredTypes.InferredType.known(decl.datatype),
                                         constRange.map { NumericLiteralValue(eltType, it.toShort(), decl.value!!.position) }.toTypedArray(),
@@ -146,6 +177,7 @@ internal class ConstantIdentifierReplacer(private val program: Program, private
                             return listOf(IAstModification.ReplaceNode(decl.value!!, newValue, decl))
                         }
                     }
+                    val numericLv = decl.value as? NumericLiteralValue
                     if(numericLv!=null && numericLv.type== DataType.FLOAT)
                         errors.err("arraysize requires only integers here", numericLv.position)
                     val size = decl.arraysize?.constIndex() ?: return noModifications
@@ -178,15 +210,13 @@ internal class ConstantIdentifierReplacer(private val program: Program, private
                     }
                 }
                 DataType.ARRAY_F -> {
-                    val size = decl.arraysize?.constIndex() ?: return noModifications
-                    val litval = decl.value as? NumericLiteralValue
                     val rangeExpr = decl.value as? RangeExpr
                     if(rangeExpr!=null) {
                         // convert the initializer range expression to an actual array of floats
                         val declArraySize = decl.arraysize?.constIndex()
-                        if(declArraySize!=null && declArraySize!=rangeExpr.size())
-                            errors.err("range expression size doesn't match declared array size", decl.value?.position!!)
-                        val constRange = rangeExpr.toConstantIntegerRange()
+                        if(declArraySize!=null && declArraySize!=rangeExpr.size(compTarget))
+                            errors.err("range expression size (${rangeExpr.size(compTarget)}) doesn't match declared array size ($declArraySize)", decl.value?.position!!)
+                        val constRange = rangeExpr.toConstantIntegerRange(compTarget)
                         if(constRange!=null) {
                             val newValue = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_F),
                                     constRange.map { NumericLiteralValue(DataType.FLOAT, it.toDouble(), decl.value!!.position) }.toTypedArray(),
@@ -194,15 +224,18 @@ internal class ConstantIdentifierReplacer(private val program: Program, private
                             return listOf(IAstModification.ReplaceNode(decl.value!!, newValue, decl))
                         }
                     }
-                    if(rangeExpr==null && litval!=null) {
+
+                    val numericLv = decl.value as? NumericLiteralValue
+                    val size = decl.arraysize?.constIndex() ?: return noModifications
+                    if(rangeExpr==null && numericLv!=null) {
                         // arraysize initializer is a single int, and we know the size.
-                        val fillvalue = litval.number.toDouble()
+                        val fillvalue = numericLv.number.toDouble()
                         if (fillvalue < compTarget.machine.FLOAT_MAX_NEGATIVE || fillvalue > compTarget.machine.FLOAT_MAX_POSITIVE)
-                            errors.err("float value overflow", litval.position)
+                            errors.err("float value overflow", numericLv.position)
                         else {
                             // create the array itself, filled with the fillvalue.
-                            val array = Array(size) {fillvalue}.map { NumericLiteralValue(DataType.FLOAT, it, litval.position) }.toTypedArray<Expression>()
-                            val refValue = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_F), array, position = litval.position)
+                            val array = Array(size) {fillvalue}.map { NumericLiteralValue(DataType.FLOAT, it, numericLv.position) }.toTypedArray<Expression>()
+                            val refValue = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_F), array, position = numericLv.position)
                             return listOf(IAstModification.ReplaceNode(decl.value!!, refValue, decl))
                         }
                     }

compiler/src/prog8/optimizer/ExpressionSimplifier.kt

@@ -45,7 +45,7 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
                 mods += IAstModification.ReplaceNode(typecast.expression, subTypecast.expression, typecast)
             }
         } else {
-            if (typecast.expression.inferType(program).istype(typecast.type)) {
+            if (typecast.expression.inferType(program) istype typecast.type) {
                 // remove duplicate cast
                 mods += IAstModification.ReplaceNode(typecast, typecast.expression, parent)
             }
@@ -134,8 +134,8 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
             ))
         }
 
-        val leftDt = leftIDt.typeOrElse(DataType.UNDEFINED)
-        val rightDt = rightIDt.typeOrElse(DataType.UNDEFINED)
+        val leftDt = leftIDt.getOr(DataType.UNDEFINED)
+        val rightDt = rightIDt.getOr(DataType.UNDEFINED)
 
         if (expr.operator == "+" || expr.operator == "-"
                 && leftVal == null && rightVal == null
@@ -289,13 +289,13 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
             val arg = functionCall.args[0]
             if(arg is TypecastExpression) {
                 val valueDt = arg.expression.inferType(program)
-                if (valueDt.istype(DataType.BYTE) || valueDt.istype(DataType.UBYTE)) {
-                    // useless lsb() of byte value that was casted to word
+                if (valueDt istype DataType.BYTE || valueDt istype DataType.UBYTE) {
+                    // useless lsb() of byte value that was typecasted to word
                     return listOf(IAstModification.ReplaceNode(functionCall, arg.expression, parent))
                 }
             } else {
                 val argDt = arg.inferType(program)
-                if (argDt.istype(DataType.BYTE) || argDt.istype(DataType.UBYTE)) {
+                if (argDt istype DataType.BYTE || argDt istype DataType.UBYTE) {
                     // useless lsb() of byte value
                     return listOf(IAstModification.ReplaceNode(functionCall, arg, parent))
                 }
@@ -305,20 +305,20 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
             val arg = functionCall.args[0]
             if(arg is TypecastExpression) {
                 val valueDt = arg.expression.inferType(program)
-                if (valueDt.istype(DataType.BYTE) || valueDt.istype(DataType.UBYTE)) {
-                    // useless msb() of byte value that was casted to word, replace with 0
+                if (valueDt istype DataType.BYTE || valueDt istype DataType.UBYTE) {
+                    // useless msb() of byte value that was typecasted to word, replace with 0
                     return listOf(IAstModification.ReplaceNode(
                             functionCall,
-                            NumericLiteralValue(valueDt.typeOrElse(DataType.UBYTE), 0, arg.expression.position),
+                            NumericLiteralValue(valueDt.getOr(DataType.UBYTE), 0, arg.expression.position),
                             parent))
                 }
             } else {
                 val argDt = arg.inferType(program)
-                if (argDt.istype(DataType.BYTE) || argDt.istype(DataType.UBYTE)) {
+                if (argDt istype DataType.BYTE || argDt istype DataType.UBYTE) {
                     // useless msb() of byte value, replace with 0
                     return listOf(IAstModification.ReplaceNode(
                             functionCall,
-                            NumericLiteralValue(argDt.typeOrElse(DataType.UBYTE), 0, arg.position),
+                            NumericLiteralValue(argDt.getOr(DataType.UBYTE), 0, arg.position),
                             parent))
                 }
             }
@@ -489,7 +489,7 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
                     val idt = expr.inferType(program)
                     if(!idt.isKnown)
                         throw FatalAstException("unknown dt")
-                    return NumericLiteralValue(idt.typeOrElse(DataType.UNDEFINED), 0, expr.position)
+                    return NumericLiteralValue(idt.getOr(DataType.UNDEFINED), 0, expr.position)
                 } else if (cv in powersOfTwo) {
                     expr.operator = "&"
                     expr.right = NumericLiteralValue.optimalInteger(cv!!.toInt()-1, expr.position)
@@ -513,7 +513,7 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
             val leftIDt = expr.left.inferType(program)
             if (!leftIDt.isKnown)
                 return null
-            val leftDt = leftIDt.typeOrElse(DataType.UNDEFINED)
+            val leftDt = leftIDt.getOr(DataType.UNDEFINED)
             when (cv) {
                 -1.0 -> {
                     //  '/' -> -left
@@ -590,14 +590,14 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
                     return expr2.left
                 }
                 in powersOfTwo -> {
-                    if (leftValue.inferType(program).isInteger()) {
+                    if (leftValue.inferType(program).isInteger) {
                         // times a power of two => shift left
                         val numshifts = log2(cv).toInt()
                         return BinaryExpression(expr2.left, "<<", NumericLiteralValue.optimalInteger(numshifts, expr.position), expr.position)
                     }
                 }
                 in negativePowersOfTwo -> {
-                    if (leftValue.inferType(program).isInteger()) {
+                    if (leftValue.inferType(program).isInteger) {
                         // times a negative power of two => negate, then shift left
                         val numshifts = log2(-cv).toInt()
                         return BinaryExpression(PrefixExpression("-", expr2.left, expr.position), "<<", NumericLiteralValue.optimalInteger(numshifts, expr.position), expr.position)
@@ -621,7 +621,7 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
         val targetIDt = expr.left.inferType(program)
         if(!targetIDt.isKnown)
             throw FatalAstException("unknown dt")
-        when (val targetDt = targetIDt.typeOrElse(DataType.UNDEFINED)) {
+        when (val targetDt = targetIDt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE, DataType.BYTE -> {
                 if (amount >= 8) {
                     return NumericLiteralValue(targetDt, 0, expr.position)
@@ -656,7 +656,7 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
         val idt = expr.left.inferType(program)
         if(!idt.isKnown)
             throw FatalAstException("unknown dt")
-        when (idt.typeOrElse(DataType.UNDEFINED)) {
+        when (idt.getOr(DataType.UNDEFINED)) {
             DataType.UBYTE -> {
                 if (amount >= 8) {
                     return NumericLiteralValue.optimalInteger(0, expr.position)

compiler/src/prog8/optimizer/Extensions.kt

@@ -21,7 +21,7 @@ internal fun Program.constantFold(errors: IErrorReporter, compTarget: ICompilati
             if(errors.noErrors()) {
                 valuetypefixer.applyModifications()
 
-                val optimizer = ConstantFoldingOptimizer(this, compTarget)
+                val optimizer = ConstantFoldingOptimizer(this)
                 optimizer.visit(this)
                 while (errors.noErrors() && optimizer.applyModifications() > 0) {
                     optimizer.visit(this)

compiler/src/prog8/optimizer/StatementOptimizer.kt

@@ -11,6 +11,7 @@ import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.ast.walk.IAstVisitor
 import prog8.compiler.IErrorReporter
+import prog8.compiler.astprocessing.size
 import prog8.compiler.target.ICompilationTarget
 import kotlin.math.floor
 
@@ -39,12 +40,46 @@ internal class StatementOptimizer(private val program: Program,
         return noModifications
     }
 
+    override fun before(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
+        // if the first instruction in the called subroutine is a return statement with a simple value,
+        // remove the jump altogeter and inline the returnvalue directly.
+        val subroutine = functionCall.target.targetSubroutine(program)
+        if(subroutine!=null) {
+            val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
+            if(first is Return && first.value?.isSimple==true) {
+                val copy = when(val orig = first.value!!) {
+                    is AddressOf -> {
+                        val scoped = scopePrefix(orig.identifier, subroutine)
+                        AddressOf(scoped, orig.position)
+                    }
+                    is DirectMemoryRead -> {
+                        when(val expr = orig.addressExpression) {
+                            is NumericLiteralValue -> DirectMemoryRead(expr.copy(), orig.position)
+                            else -> return noModifications
+                        }
+                    }
+                    is IdentifierReference -> scopePrefix(orig, subroutine)
+                    is NumericLiteralValue -> orig.copy()
+                    is StringLiteralValue -> orig.copy()
+                    else -> return noModifications
+                }
+                return listOf(IAstModification.ReplaceNode(functionCall, copy, parent))
+            }
+        }
+        return noModifications
+    }
+
+    private fun scopePrefix(variable: IdentifierReference, subroutine: Subroutine): IdentifierReference {
+        val scoped = subroutine.makeScopedName(variable.nameInSource.last())
+        return IdentifierReference(scoped.split('.'), variable.position)
+    }
+
     override fun after(functionCallStatement: FunctionCallStatement, parent: Node): Iterable<IAstModification> {
         if(functionCallStatement.target.nameInSource.size==1 && functionCallStatement.target.nameInSource[0] in functions.names) {
             val functionName = functionCallStatement.target.nameInSource[0]
             if (functionName in functions.purefunctionNames) {
                 errors.warn("statement has no effect (function return value is discarded)", functionCallStatement.position)
-                return listOf(IAstModification.Remove(functionCallStatement, functionCallStatement.definingScope()))
+                return listOf(IAstModification.Remove(functionCallStatement, functionCallStatement.definingScope))
             }
         }
 
@@ -95,33 +130,33 @@ internal class StatementOptimizer(private val program: Program,
         if(subroutine!=null) {
             val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
             if(first is Return)
-                return listOf(IAstModification.Remove(functionCallStatement, functionCallStatement.definingScope()))
+                return listOf(IAstModification.Remove(functionCallStatement, functionCallStatement.definingScope))
         }
 
         return noModifications
     }
 
-    override fun before(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
-        // if the first instruction in the called subroutine is a return statement with constant value, replace with the constant value
-        val subroutine = functionCall.target.targetSubroutine(program)
-        if(subroutine!=null) {
-            val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
-            if(first is Return && first.value!=null) {
-                val constval = first.value?.constValue(program)
-                if(constval!=null)
-                    return listOf(IAstModification.ReplaceNode(functionCall, constval, parent))
-            }
-        }
-        return noModifications
-    }
+//    override fun before(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
+//        // if the first instruction in the called subroutine is a return statement with constant value, replace with the constant value
+//        val subroutine = functionCall.target.targetSubroutine(program)
+//        if(subroutine!=null) {
+//            val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
+//            if(first is Return && first.value!=null) {
+//                val constval = first.value?.constValue(program)
+//                if(constval!=null)
+//                    return listOf(IAstModification.ReplaceNode(functionCall, constval, parent))
+//            }
+//        }
+//        return noModifications
+//    }
 
     override fun after(ifStatement: IfStatement, parent: Node): Iterable<IAstModification> {
         // remove empty if statements
-        if(ifStatement.truepart.containsNoCodeNorVars() && ifStatement.elsepart.containsNoCodeNorVars())
-            return listOf(IAstModification.Remove(ifStatement, ifStatement.definingScope()))
+        if(ifStatement.truepart.containsNoCodeNorVars && ifStatement.elsepart.containsNoCodeNorVars)
+            return listOf(IAstModification.Remove(ifStatement, ifStatement.definingScope))
 
         // empty true part? switch with the else part
-        if(ifStatement.truepart.containsNoCodeNorVars() && ifStatement.elsepart.containsCodeOrVars()) {
+        if(ifStatement.truepart.containsNoCodeNorVars && ifStatement.elsepart.containsCodeOrVars) {
             val invertedCondition = PrefixExpression("not", ifStatement.condition, ifStatement.condition.position)
             val emptyscope = AnonymousScope(mutableListOf(), ifStatement.elsepart.position)
             val truepart = AnonymousScope(ifStatement.elsepart.statements, ifStatement.truepart.position)
@@ -149,20 +184,20 @@ internal class StatementOptimizer(private val program: Program,
     }
 
     override fun after(forLoop: ForLoop, parent: Node): Iterable<IAstModification> {
-        if(forLoop.body.containsNoCodeNorVars()) {
+        if(forLoop.body.containsNoCodeNorVars) {
             errors.warn("removing empty for loop", forLoop.position)
-            return listOf(IAstModification.Remove(forLoop, forLoop.definingScope()))
+            return listOf(IAstModification.Remove(forLoop, forLoop.definingScope))
         } else if(forLoop.body.statements.size==1) {
             val loopvar = forLoop.body.statements[0] as? VarDecl
             if(loopvar!=null && loopvar.name==forLoop.loopVar.nameInSource.singleOrNull()) {
                 // remove empty for loop (only loopvar decl in it)
-                return listOf(IAstModification.Remove(forLoop, forLoop.definingScope()))
+                return listOf(IAstModification.Remove(forLoop, forLoop.definingScope))
             }
         }
 
         val range = forLoop.iterable as? RangeExpr
         if(range!=null) {
-            if(range.size()==1) {
+            if (range.size(compTarget) == 1) {
                 // for loop over a (constant) range of just a single value-- optimize the loop away
                 // loopvar/reg = range value , follow by block
                 val scope = AnonymousScope(mutableListOf(), forLoop.position)
@@ -233,7 +268,7 @@ internal class StatementOptimizer(private val program: Program,
             } else {
                 // always false -> remove the while statement altogether
                 errors.warn("condition is always false", whileLoop.condition.position)
-                listOf(IAstModification.Remove(whileLoop, whileLoop.definingScope()))
+                listOf(IAstModification.Remove(whileLoop, whileLoop.definingScope))
             }
         }
         return noModifications
@@ -242,14 +277,14 @@ internal class StatementOptimizer(private val program: Program,
     override fun after(repeatLoop: RepeatLoop, parent: Node): Iterable<IAstModification> {
         val iter = repeatLoop.iterations
         if(iter!=null) {
-            if(repeatLoop.body.containsNoCodeNorVars()) {
+            if(repeatLoop.body.containsNoCodeNorVars) {
                 errors.warn("empty loop removed", repeatLoop.position)
-                return listOf(IAstModification.Remove(repeatLoop, repeatLoop.definingScope()))
+                return listOf(IAstModification.Remove(repeatLoop, repeatLoop.definingScope))
             }
             val iterations = iter.constValue(program)?.number?.toInt()
             if (iterations == 0) {
                 errors.warn("iterations is always 0, removed loop", iter.position)
-                return listOf(IAstModification.Remove(repeatLoop, repeatLoop.definingScope()))
+                return listOf(IAstModification.Remove(repeatLoop, repeatLoop.definingScope))
             }
             if (iterations == 1) {
                 errors.warn("iterations is always 1", iter.position)
@@ -261,10 +296,10 @@ internal class StatementOptimizer(private val program: Program,
 
     override fun after(jump: Jump, parent: Node): Iterable<IAstModification> {
         // if the jump is to the next statement, remove the jump
-        val scope = jump.definingScope()
+        val scope = jump.definingScope
         val label = jump.identifier?.targetStatement(program)
         if(label!=null && scope.statements.indexOf(label) == scope.statements.indexOf(jump)+1)
-            return listOf(IAstModification.Remove(jump, jump.definingScope()))
+            return listOf(IAstModification.Remove(jump, jump.definingScope))
 
         return noModifications
     }
@@ -297,7 +332,7 @@ internal class StatementOptimizer(private val program: Program,
                                 )
                                 return listOf(
                                         IAstModification.ReplaceNode(binExpr, expr2, binExpr.parent),
-                                        IAstModification.InsertAfter(assignment, addConstant, assignment.definingScope()))
+                                        IAstModification.InsertAfter(assignment, addConstant, assignment.definingScope))
                             } else if (op2 == "-") {
                                 // A = A +/- B - N
                                 val expr2 = BinaryExpression(binExpr.left, binExpr.operator, rExpr.left, binExpr.position)
@@ -308,7 +343,7 @@ internal class StatementOptimizer(private val program: Program,
                                 )
                                 return listOf(
                                         IAstModification.ReplaceNode(binExpr, expr2, binExpr.parent),
-                                        IAstModification.InsertAfter(assignment, subConstant, assignment.definingScope()))
+                                        IAstModification.InsertAfter(assignment, subConstant, assignment.definingScope))
                             }
                         }
                     }
@@ -330,7 +365,7 @@ internal class StatementOptimizer(private val program: Program,
     override fun after(assignment: Assignment, parent: Node): Iterable<IAstModification> {
         if(assignment.target isSameAs assignment.value) {
             // remove assignment to self
-            return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+            return listOf(IAstModification.Remove(assignment, assignment.definingScope))
         }
 
         val targetIDt = assignment.target.inferType(program)
@@ -338,7 +373,7 @@ internal class StatementOptimizer(private val program: Program,
             throw FatalAstException("can't infer type of assignment target")
 
         // optimize binary expressions a bit
-        val targetDt = targetIDt.typeOrElse(DataType.UNDEFINED)
+        val targetDt = targetIDt.getOr(DataType.UNDEFINED)
         val bexpr=assignment.value as? BinaryExpression
         if(bexpr!=null) {
             val rightCv = bexpr.right.constValue(program)?.number?.toDouble()
@@ -350,7 +385,7 @@ internal class StatementOptimizer(private val program: Program,
                 when (bexpr.operator) {
                     "+" -> {
                         if (rightCv == 0.0) {
-                            return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+                            return listOf(IAstModification.Remove(assignment, assignment.definingScope))
                         } else if (targetDt in IntegerDatatypes && floor(rightCv) == rightCv) {
                             if (vardeclDt != VarDeclType.MEMORY && rightCv in 1.0..4.0) {
                                 // replace by several INCs if it's not a memory address (inc on a memory mapped register doesn't work very well)
@@ -364,7 +399,7 @@ internal class StatementOptimizer(private val program: Program,
                     }
                     "-" -> {
                         if (rightCv == 0.0) {
-                            return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+                            return listOf(IAstModification.Remove(assignment, assignment.definingScope))
                         } else if (targetDt in IntegerDatatypes && floor(rightCv) == rightCv) {
                             if (vardeclDt != VarDeclType.MEMORY && rightCv in 1.0..4.0) {
                                 // replace by several DECs if it's not a memory address (dec on a memory mapped register doesn't work very well)
@@ -376,18 +411,18 @@ internal class StatementOptimizer(private val program: Program,
                             }
                         }
                     }
-                    "*" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
-                    "/" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
-                    "**" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
-                    "|" -> if (rightCv == 0.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
-                    "^" -> if (rightCv == 0.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+                    "*" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope))
+                    "/" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope))
+                    "**" -> if (rightCv == 1.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope))
+                    "|" -> if (rightCv == 0.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope))
+                    "^" -> if (rightCv == 0.0) return listOf(IAstModification.Remove(assignment, assignment.definingScope))
                     "<<" -> {
                         if (rightCv == 0.0)
-                            return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+                            return listOf(IAstModification.Remove(assignment, assignment.definingScope))
                     }
                     ">>" -> {
                         if (rightCv == 0.0)
-                            return listOf(IAstModification.Remove(assignment, assignment.definingScope()))
+                            return listOf(IAstModification.Remove(assignment, assignment.definingScope))
                     }
                 }
 
@@ -399,7 +434,7 @@ internal class StatementOptimizer(private val program: Program,
 
     override fun after(returnStmt: Return, parent: Node): Iterable<IAstModification> {
         fun returnViaIntermediaryVar(value: Expression): Iterable<IAstModification>? {
-            val subr = returnStmt.definingSubroutine()!!
+            val subr = returnStmt.definingSubroutine!!
             val returnDt = subr.returntypes.single()
             if (returnDt in IntegerDatatypes) {
                 // first assign to intermediary variable, then return that

compiler/src/prog8/optimizer/SubroutineInliner.kt

@@ -1,96 +0,0 @@
-package prog8.optimizer
-
-import prog8.ast.IFunctionCall
-import prog8.ast.Node
-import prog8.ast.Program
-import prog8.ast.base.Position
-import prog8.ast.expressions.FunctionCall
-import prog8.ast.expressions.IdentifierReference
-import prog8.ast.statements.*
-import prog8.ast.walk.AstWalker
-import prog8.ast.walk.IAstModification
-import prog8.compiler.CompilationOptions
-import prog8.compiler.IErrorReporter
-
-
-internal class SubroutineInliner(private val program: Program, val errors: IErrorReporter, private val compilerOptions: CompilationOptions): AstWalker() {
-    private var callsToInlinedSubroutines = mutableListOf<Pair<IFunctionCall, Node>>()
-
-    fun fixCallsToInlinedSubroutines() {
-        for((call, parent) in callsToInlinedSubroutines) {
-            val sub = call.target.targetSubroutine(program)!!
-            val intermediateReturnValueVar = sub.statements.filterIsInstance<VarDecl>().singleOrNull { it.name.endsWith(retvarName) }
-            if(intermediateReturnValueVar!=null) {
-                val scope = parent.definingScope()
-                if(!scope.statements.filterIsInstance<VarDecl>().any { it.name==intermediateReturnValueVar.name}) {
-                    val decl = intermediateReturnValueVar.copy()
-                    scope.statements.add(0, decl)
-                    decl.linkParents(scope as Node)
-                }
-            }
-        }
-    }
-
-    override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
-        return if(compilerOptions.optimize && subroutine.inline && !subroutine.isAsmSubroutine)
-            annotateInlinedSubroutineIdentifiers(subroutine)
-        else
-            noModifications
-    }
-
-    override fun after(functionCallStatement: FunctionCallStatement, parent: Node): Iterable<IAstModification> {
-        return after(functionCallStatement as IFunctionCall, parent, functionCallStatement.position)
-    }
-
-    override fun after(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
-        return after(functionCall as IFunctionCall, parent, functionCall.position)
-    }
-
-    private fun after(functionCall: IFunctionCall, parent: Node, position: Position): Iterable<IAstModification> {
-        val sub = functionCall.target.targetSubroutine(program)
-        if(sub != null && compilerOptions.optimize && sub.inline && !sub.isAsmSubroutine)
-            callsToInlinedSubroutines.add(Pair(functionCall, parent))
-
-        return noModifications
-    }
-
-    private fun annotateInlinedSubroutineIdentifiers(sub: Subroutine): List<IAstModification> {
-        // this adds name prefixes to the identifiers used in the subroutine,
-        // so that the statements can be inlined (=copied) in the call site and still reference
-        // the correct symbols as seen from the scope of the subroutine.
-
-        class Annotator: AstWalker() {
-            var numReturns=0
-
-            override fun before(identifier: IdentifierReference, parent: Node): Iterable<IAstModification> {
-                val stmt = identifier.targetStatement(program)!!
-                if(stmt is BuiltinFunctionStatementPlaceholder)
-                    return noModifications
-
-                val prefixed = stmt.makeScopedName(identifier.nameInSource.last()).split('.')
-                val withPrefix = IdentifierReference(prefixed, identifier.position)
-                return listOf(IAstModification.ReplaceNode(identifier, withPrefix, parent))
-            }
-
-            override fun before(returnStmt: Return, parent: Node): Iterable<IAstModification> {
-                numReturns++
-                if(parent !== sub || sub.indexOfChild(returnStmt)<sub.statements.size-1)
-                    errors.err("return statement must be the very last statement in the inlined subroutine", sub.position)
-                return noModifications
-            }
-
-            fun theModifications(): List<IAstModification> {
-                return this.modifications.map { it.first }.toList()
-            }
-        }
-
-        val annotator = Annotator()
-        sub.accept(annotator, sub.parent)
-        if(annotator.numReturns>1) {
-            errors.err("inlined subroutine can only have one return statement", sub.position)
-            return noModifications
-        }
-        return annotator.theModifications()
-    }
-
-}

compiler/src/prog8/optimizer/UnusedCodeRemover.kt

@@ -10,6 +10,7 @@ import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.compiler.IErrorReporter
+import prog8.compiler.astprocessing.isInRegularRAMof
 import prog8.compiler.target.ICompilationTarget
 
 
@@ -20,8 +21,8 @@ internal class UnusedCodeRemover(private val program: Program,
     private val callgraph = CallGraph(program)
 
     override fun before(module: Module, parent: Node): Iterable<IAstModification> {
-        return if (!module.isLibraryModule && (module.containsNoCodeNorVars() || callgraph.unused(module)))
-            listOf(IAstModification.Remove(module, module.definingScope()))
+        return if (!module.isLibrary && (module.containsNoCodeNorVars || callgraph.unused(module)))
+            listOf(IAstModification.Remove(module, module.definingScope))
         else
             noModifications
     }
@@ -61,7 +62,7 @@ internal class UnusedCodeRemover(private val program: Program,
 
     override fun after(block: Block, parent: Node): Iterable<IAstModification> {
         if("force_output" !in block.options()) {
-            if (block.containsNoCodeNorVars()) {
+            if (block.containsNoCodeNorVars) {
                 if(block.name != internedStringsModuleName)
                     errors.warn("removing unused block '${block.name}'", block.position)
                 return listOf(IAstModification.Remove(block, parent as INameScope))
@@ -77,22 +78,22 @@ internal class UnusedCodeRemover(private val program: Program,
     }
 
     override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
-        val forceOutput = "force_output" in subroutine.definingBlock().options()
-        if (subroutine !== program.entrypoint() && !forceOutput && !subroutine.inline && !subroutine.isAsmSubroutine) {
+        val forceOutput = "force_output" in subroutine.definingBlock.options()
+        if (subroutine !== program.entrypoint && !forceOutput && !subroutine.inline && !subroutine.isAsmSubroutine) {
             if(callgraph.unused(subroutine)) {
-                if(!subroutine.definingModule().isLibraryModule)
-                    errors.warn("removing unused subroutine '${subroutine.name}'", subroutine.position)
-                return listOf(IAstModification.Remove(subroutine, subroutine.definingScope()))
-            }
-            if(subroutine.containsNoCodeNorVars()) {
-                if(!subroutine.definingModule().isLibraryModule)
-                    errors.warn("removing empty subroutine '${subroutine.name}'", subroutine.position)
-                val removals = mutableListOf(IAstModification.Remove(subroutine, subroutine.definingScope()))
-                callgraph.calledBy[subroutine]?.let {
-                    for(node in it)
-                        removals.add(IAstModification.Remove(node, node.definingScope()))
+                if(subroutine.containsNoCodeNorVars) {
+                    if(!subroutine.definingModule.isLibrary)
+                        errors.warn("removing empty subroutine '${subroutine.name}'", subroutine.position)
+                    val removals = mutableListOf(IAstModification.Remove(subroutine, subroutine.definingScope))
+                    callgraph.calledBy[subroutine]?.let {
+                        for(node in it)
+                            removals.add(IAstModification.Remove(node, node.definingScope))
+                    }
+                    return removals
                 }
-                return removals
+                if(!subroutine.definingModule.isLibrary)
+                    errors.warn("removing unused subroutine '${subroutine.name}'", subroutine.position)
+                return listOf(IAstModification.Remove(subroutine, subroutine.definingScope))
             }
         }
 
@@ -102,11 +103,11 @@ internal class UnusedCodeRemover(private val program: Program,
 
     override fun after(decl: VarDecl, parent: Node): Iterable<IAstModification> {
         if(decl.type==VarDeclType.VAR) {
-            val forceOutput = "force_output" in decl.definingBlock().options()
-            if (!forceOutput && !decl.autogeneratedDontRemove && !decl.sharedWithAsm && !decl.definingBlock().isInLibrary) {
+            val forceOutput = "force_output" in decl.definingBlock.options()
+            if (!forceOutput && !decl.autogeneratedDontRemove && !decl.sharedWithAsm && !decl.definingBlock.isInLibrary) {
                 if (callgraph.unused(decl)) {
                     errors.warn("removing unused variable '${decl.name}'", decl.position)
-                    return listOf(IAstModification.Remove(decl, decl.definingScope()))
+                    return listOf(IAstModification.Remove(decl, decl.definingScope))
                 }
             }
         }
@@ -122,7 +123,7 @@ internal class UnusedCodeRemover(private val program: Program,
             val assign1 = stmtPairs[0] as? Assignment
             val assign2 = stmtPairs[1] as? Assignment
             if (assign1 != null && assign2 != null && !assign2.isAugmentable) {
-                if (assign1.target.isSameAs(assign2.target, program) && compTarget.isInRegularRAM(assign1.target, program))  {
+                if (assign1.target.isSameAs(assign2.target, program) && assign1.target.isInRegularRAMof(compTarget.machine))  {
                     if(assign2.target.identifier==null || !assign2.value.referencesIdentifier(*(assign2.target.identifier!!.nameInSource.toTypedArray())))
                         // only remove the second assignment if its value is a simple expression!
                         when(assign2.value) {

compiler/test/AsmgenTests.kt

@@ -2,34 +2,27 @@ package prog8tests
 
 import org.hamcrest.MatcherAssert.assertThat
 import org.hamcrest.Matchers.equalTo
-import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
-import prog8.ast.IBuiltinFunctions
-import prog8.ast.IMemSizer
 import prog8.ast.Module
 import prog8.ast.Program
 import prog8.ast.base.*
-import prog8.ast.expressions.*
+import prog8.ast.expressions.AddressOf
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.NumericLiteralValue
 import prog8.ast.statements.*
 import prog8.compiler.*
 import prog8.compiler.target.C64Target
 import prog8.compiler.target.c64.C64MachineDefinition
 import prog8.compiler.target.cpu6502.codegen.AsmGen
+import prog8.parser.SourceCode
+import prog8tests.helpers.DummyFunctions
+import prog8tests.helpers.DummyMemsizer
 import java.nio.file.Path
 
+
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class TestAsmGen6502 {
-    private class DummyFunctions: IBuiltinFunctions {
-        override val names: Set<String> = emptySet()
-        override val purefunctionNames: Set<String> = emptySet()
-        override fun constValue(name: String, args: List<Expression>, position: Position, memsizer: IMemSizer): NumericLiteralValue? = null
-        override fun returnType(name: String, args: MutableList<Expression>) = InferredTypes.InferredType.unknown()
-    }
-
-    private class DummyMemsizer: IMemSizer {
-        override fun memorySize(dt: DataType): Int = 0
-    }
 
     private fun createTestProgram(): Program {
         /*
@@ -75,10 +68,10 @@ locallabel:
         val varInBlock = VarDecl(VarDeclType.VAR, DataType.UWORD, ZeropageWish.DONTCARE, null, "var_outside", null, false, false, false, Position.DUMMY)
         val block = Block("main", null, mutableListOf(labelInBlock, varInBlock, subroutine), false, Position.DUMMY)
 
-        val module = Module("test", mutableListOf(block), Position.DUMMY, false, Path.of(""))
-        module.linkParents(ParentSentinel)
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.program = program
+        val module = Module(mutableListOf(block), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
         return program
     }
 
@@ -86,7 +79,7 @@ locallabel:
         val errors = ErrorReporter()
         val options = CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, true, C64Target)
         val zp = C64MachineDefinition.C64Zeropage(options)
-        val asmgen = AsmGen(program, errors, zp, options, C64Target, Path.of("."))
+        val asmgen = AsmGen(program, errors, zp, options, C64Target, Path.of(""))
         return asmgen
     }
 
@@ -108,7 +101,7 @@ locallabel:
     fun testSymbolNameFromVarIdentifier() {
         val program = createTestProgram()
         val asmgen = createTestAsmGen(program)
-        val sub = program.entrypoint()
+        val sub = program.entrypoint
 
         // local variable
         val localvarIdent = sub.statements.filterIsInstance<Assignment>().first { it.value is IdentifierReference }.value as IdentifierReference
@@ -132,7 +125,7 @@ locallabel:
     fun testSymbolNameFromLabelIdentifier() {
         val program = createTestProgram()
         val asmgen = createTestAsmGen(program)
-        val sub = program.entrypoint()
+        val sub = program.entrypoint
 
         // local label
         val localLabelIdent = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("locallabel") }.value as AddressOf).identifier

compiler/test/ModuleImporterTests.kt

@@ -0,0 +1,325 @@
+package prog8tests
+
+import kotlin.test.*
+import com.github.michaelbull.result.getErrorOrElse
+import com.github.michaelbull.result.getOrElse
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers.*
+import org.hamcrest.core.Is
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Nested
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.Disabled
+import prog8.ast.Program
+import prog8.ast.internedStringsModuleName
+import prog8.compiler.IErrorReporter
+import prog8.compiler.ModuleImporter
+import prog8.parser.ParseError
+import prog8.parser.SourceCode
+import prog8tests.helpers.*
+import kotlin.io.path.*
+
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestModuleImporter {
+    private val count = listOf("1st", "2nd", "3rd", "4th", "5th")
+
+    private lateinit var program: Program
+    @BeforeEach
+    fun beforeEach() {
+        program = Program("foo", DummyFunctions, DummyMemsizer)
+    }
+
+    private fun makeImporter(errors: IErrorReporter?, vararg searchIn: String): ModuleImporter {
+        return makeImporter(errors, searchIn.asList())
+    }
+
+    private fun makeImporter(errors: IErrorReporter? = null, searchIn: Iterable<String>) =
+        ModuleImporter(program, "blah", errors ?: ErrorReporterForTests(), searchIn.toList())
+
+    @Nested
+    inner class Constructor {
+
+        @Test
+        @Disabled("TODO: invalid entries in search list")
+        fun testInvalidEntriesInSearchList() {}
+
+        @Test
+        @Disabled("TODO: literal duplicates in search list")
+        fun testLiteralDuplicatesInSearchList() {}
+
+        @Test
+        @Disabled("TODO: factual duplicates in search list")
+        fun testFactualDuplicatesInSearchList() {}
+    }
+
+    @Nested
+    inner class ImportModule {
+
+        @Nested
+        inner class WithInvalidPath {
+            @Test
+            fun testNonexisting() {
+                val dirRel = assumeDirectory(".", workingDir.relativize(fixturesDir))
+                val importer = makeImporter(null, dirRel.invariantSeparatorsPathString)
+                val srcPathRel = assumeNotExists(dirRel, "i_do_not_exist")
+                val srcPathAbs = srcPathRel.absolute()
+                val error1 = importer.importModule(srcPathRel).getErrorOrElse { fail("should have import error") }
+                assertThat(
+                    ".file should be normalized",
+                    "${error1.file}", equalTo("${error1.file.normalize()}")
+                )
+                assertThat(
+                    ".file should point to specified path",
+                    error1.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
+                )
+                assertThat(program.modules.size, equalTo(1))
+
+                val error2 = importer.importModule(srcPathAbs).getErrorOrElse { fail("should have import error") }
+                assertThat(
+                    ".file should be normalized",
+                    "${error2.file}", equalTo("${error2.file.normalize()}")
+                )
+                assertThat(
+                    ".file should point to specified path",
+                    error2.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
+                )
+                assertThat(program.modules.size, equalTo(1))
+            }
+
+            @Test
+            fun testDirectory() {
+                val srcPathRel = assumeDirectory(workingDir.relativize(fixturesDir))
+                val srcPathAbs = srcPathRel.absolute()
+                val searchIn = Path(".", "$srcPathRel").invariantSeparatorsPathString
+                val importer = makeImporter(null, searchIn)
+
+                assertFailsWith<AccessDeniedException> { importer.importModule(srcPathRel) }
+                    .let {
+                        assertThat(
+                            ".file should be normalized",
+                            "${it.file}", equalTo("${it.file.normalize()}")
+                        )
+                        assertThat(
+                            ".file should point to specified path",
+                            it.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
+                        )
+                    }
+                assertThat(program.modules.size, equalTo(1))
+
+                assertFailsWith<AccessDeniedException> { importer.importModule(srcPathAbs) }
+                    .let {
+                        assertThat(
+                            ".file should be normalized",
+                            "${it.file}", equalTo("${it.file.normalize()}")
+                        )
+                        assertThat(
+                            ".file should point to specified path",
+                            it.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
+                        )
+                    }
+                assertThat(program.modules.size, equalTo(1))
+            }
+        }
+
+        @Nested
+        inner class WithValidPath {
+
+            @Test
+            fun testAbsolute() {
+                val searchIn = listOf(
+                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
+                ).map { it.invariantSeparatorsPathString }
+                val importer = makeImporter(null, searchIn)
+                val fileName = "simple_main.p8"
+                val path = assumeReadableFile(searchIn[0], fileName)
+
+                val module = importer.importModule(path.absolute()).getOrElse { throw it }
+                assertThat(program.modules.size, equalTo(2))
+                assertContains(program.modules, module)
+                assertThat(module.program, equalTo(program))
+            }
+
+            @Test
+            fun testRelativeToWorkingDir() {
+                val searchIn = listOf(
+                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
+                ).map { it.invariantSeparatorsPathString }
+                val importer = makeImporter(null, searchIn)
+                val fileName = "simple_main.p8"
+                val path = assumeReadableFile(searchIn[0], fileName)
+                assertThat("sanity check: path should NOT be absolute", path.isAbsolute, equalTo(false))
+
+                val module = importer.importModule(path).getOrElse { throw it }
+                assertThat(program.modules.size, equalTo(2))
+                assertContains(program.modules, module)
+                assertThat(module.program, equalTo(program))
+            }
+
+            @Test
+            fun testRelativeTo1stDirInSearchList() {
+                val searchIn = Path(".")
+                    .div(workingDir.relativize(fixturesDir))
+                    .invariantSeparatorsPathString
+                val importer = makeImporter(null, searchIn)
+                val fileName = "simple_main.p8"
+                val path = Path(".", fileName)
+                assumeReadableFile(searchIn, path)
+
+                val module = importer.importModule(path).getOrElse { throw it }
+                assertThat(program.modules.size, equalTo(2))
+                assertContains(program.modules, module)
+                assertThat(module.program, equalTo(program))
+            }
+
+            @Test
+            @Disabled("TODO: relative to 2nd in search list")
+            fun testRelativeTo2ndDirInSearchList() {}
+
+            @Test
+            @Disabled("TODO: ambiguous - 2 or more really different candidates")
+            fun testAmbiguousCandidates() {}
+
+            @Nested
+            inner class WithBadFile {
+                @Test
+                fun testWithSyntaxError() {
+                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
+                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
+                    val srcPath = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")
+
+                    val act = { importer.importModule(srcPath) }
+
+                    repeat(2) { n ->
+                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
+                            assertThat(it.position.file, equalTo(SourceCode.relative(srcPath).toString()))
+                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
+                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
+                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                        }
+                        assertThat(program.modules.size, equalTo(1))
+                    }
+                }
+
+                @Test
+                fun testImportingFileWithSyntaxError_once() {
+                    doTestImportingFileWithSyntaxError(1)
+                }
+
+                @Test
+                fun testImportingFileWithSyntaxError_twice() {
+                    doTestImportingFileWithSyntaxError(2)
+                }
+
+                private fun doTestImportingFileWithSyntaxError(repetitions: Int) {
+                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
+                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
+                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
+                    val imported = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")
+
+                    val act = { importer.importModule(importing) }
+
+                    repeat(repetitions) { n ->
+                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
+                            assertThat(it.position.file, equalTo(SourceCode.relative(imported).toString()))
+                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
+                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
+                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                        }
+                        assertThat("imported module with error in it should not be present", program.modules.size, equalTo(1))
+                        assertThat(program.modules[0].name, equalTo(internedStringsModuleName))
+                    }
+                }
+            }
+        }
+
+    }
+
+    @Nested
+    inner class ImportLibraryModule {
+        @Nested
+        inner class WithInvalidName {
+            @Test
+            fun testWithNonExistingName() {
+                val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
+                val errors = ErrorReporterForTests()
+                val importer = makeImporter(errors, searchIn.invariantSeparatorsPathString)
+                val filenameNoExt = assumeNotExists(fixturesDir, "i_do_not_exist").name
+                val filenameWithExt = assumeNotExists(fixturesDir, "i_do_not_exist.p8").name
+
+                repeat(2) { n ->
+                    val result = importer.importLibraryModule(filenameNoExt)
+                    assertThat(count[n] + " call / NO .p8 extension", result, Is(nullValue()))
+                    assertFalse(errors.noErrors(), count[n] + " call / NO .p8 extension")
+                    assertEquals(errors.errors.single(), "no module found with name i_do_not_exist")
+                    errors.report()
+                    assertThat(program.modules.size, equalTo(1))
+
+                    val result2 = importer.importLibraryModule(filenameWithExt)
+                    assertThat(count[n] + " call / with .p8 extension", result2, Is(nullValue()))
+                    assertFalse(importer.errors.noErrors(), count[n] + " call / with .p8 extension")
+                    assertEquals(errors.errors.single(), "no module found with name i_do_not_exist.p8")
+                    errors.report()
+                    assertThat(program.modules.size, equalTo(1))
+                }
+            }
+        }
+
+        @Nested
+        inner class WithValidName {
+            @Nested
+            inner class WithBadFile {
+                @Test
+                fun testWithSyntaxError() {
+                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
+                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
+                    val srcPath = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")
+
+                    repeat(2) { n ->
+                        assertFailsWith<ParseError>(count[n] + " call")
+                            { importer.importLibraryModule(srcPath.nameWithoutExtension) }.let {
+                                assertThat(it.position.file, equalTo(SourceCode.relative(srcPath).toString()))
+                                assertThat("line; should be 1-based", it.position.line, equalTo(2))
+                                assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
+                                assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                            }
+                        assertThat(program.modules.size, equalTo(1))
+                    }
+                }
+
+
+                private fun doTestImportingFileWithSyntaxError(repetitions: Int) {
+                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
+                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
+                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
+                    val imported = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")
+
+                    val act = { importer.importLibraryModule(importing.nameWithoutExtension) }
+
+                    repeat(repetitions) { n ->
+                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
+                            assertThat(it.position.file, equalTo(SourceCode.relative(imported).toString()))
+                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
+                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
+                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                        }
+                        assertThat("imported module with error in it should not be present", program.modules.size, equalTo(1))
+                        assertThat(program.modules[0].name, equalTo(internedStringsModuleName))
+                        importer.errors.report()
+                    }
+                }
+
+                @Test
+                fun testImportingFileWithSyntaxError_once() {
+                    doTestImportingFileWithSyntaxError(1)
+                }
+
+                @Test
+                fun testImportingFileWithSyntaxError_twice() {
+                    doTestImportingFileWithSyntaxError(2)
+                }
+            }
+        }
+    }
+}

compiler/test/TestCallgraph.kt

@@ -0,0 +1,91 @@
+package prog8tests
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import prog8.ast.statements.Block
+import prog8.ast.statements.Subroutine
+import prog8.compiler.target.C64Target
+import prog8.optimizer.CallGraph
+import prog8tests.helpers.assertSuccess
+import prog8tests.helpers.compileText
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCallgraph {
+    @Test
+    fun testGraphForEmptySubs() {
+        val sourcecode = """
+            %import string
+            main {
+                sub start() {
+                }
+                sub empty() {
+                }
+            }
+        """
+        val result = compileText(C64Target, false, sourcecode).assertSuccess()
+        val graph = CallGraph(result.programAst)
+
+        assertEquals(1, graph.imports.size)
+        assertEquals(1, graph.importedBy.size)
+        val toplevelModule = result.programAst.toplevelModule
+        val importedModule = graph.imports.getValue(toplevelModule).single()
+        assertEquals("string", importedModule.name)
+        val importedBy = graph.importedBy.getValue(importedModule).single()
+        assertTrue(importedBy.name.startsWith("on_the_fly_test"))
+
+        assertFalse(graph.unused(toplevelModule))
+        assertFalse(graph.unused(importedModule))
+
+        val mainBlock = toplevelModule.statements.filterIsInstance<Block>().single()
+        for(stmt in mainBlock.statements) {
+            val sub = stmt as Subroutine
+            assertFalse(sub in graph.calls)
+            assertFalse(sub in graph.calledBy)
+
+            if(sub === result.programAst.entrypoint)
+                assertFalse(graph.unused(sub), "start() should always be marked as used to avoid having it removed")
+            else
+                assertTrue(graph.unused(sub))
+        }
+    }
+
+    @Test
+    fun testGraphForEmptyButReferencedSub() {
+        val sourcecode = """
+            %import string
+            main {
+                sub start() {
+                    uword xx = &empty
+                    xx++
+                }
+                sub empty() {
+                }
+            }
+        """
+        val result = compileText(C64Target, false, sourcecode).assertSuccess()
+        val graph = CallGraph(result.programAst)
+
+        assertEquals(1, graph.imports.size)
+        assertEquals(1, graph.importedBy.size)
+        val toplevelModule = result.programAst.toplevelModule
+        val importedModule = graph.imports.getValue(toplevelModule).single()
+        assertEquals("string", importedModule.name)
+        val importedBy = graph.importedBy.getValue(importedModule).single()
+        assertTrue(importedBy.name.startsWith("on_the_fly_test"))
+
+        assertFalse(graph.unused(toplevelModule))
+        assertFalse(graph.unused(importedModule))
+
+        val mainBlock = toplevelModule.statements.filterIsInstance<Block>().single()
+        val startSub = mainBlock.statements.filterIsInstance<Subroutine>().single{it.name=="start"}
+        val emptySub = mainBlock.statements.filterIsInstance<Subroutine>().single{it.name=="empty"}
+
+        assertTrue(startSub in graph.calls, "start 'calls' (references) empty")
+        assertFalse(emptySub in graph.calls, "empty doesn't call anything")
+        assertTrue(emptySub in graph.calledBy, "empty gets 'called'")
+        assertFalse(startSub in graph.calledBy, "start doesn't get called (except as entrypoint ofc.)")
+    }
+}

compiler/test/TestCompilerOnCharLit.kt

@@ -0,0 +1,120 @@
+package prog8tests
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import prog8.ast.IFunctionCall
+import prog8.ast.base.DataType
+import prog8.ast.base.VarDeclType
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.NumericLiteralValue
+import prog8.compiler.target.Cx16Target
+import prog8tests.helpers.assertSuccess
+import prog8tests.helpers.compileText
+import kotlin.test.assertEquals
+import kotlin.test.assertIs
+
+
+/**
+ * ATTENTION: this is just kludge!
+ * They are not really unit tests, but rather tests of the whole process,
+ * from source file loading all the way through to running 64tass.
+ */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCompilerOnCharLit {
+
+    @Test
+    fun testCharLitAsRomsubArg() {
+        val platform = Cx16Target
+        val result = compileText(platform, false, """
+            main {
+                romsub ${"$"}FFD2 = chrout(ubyte ch @ A)
+                sub start() {
+                    chrout('\n')
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val funCall = startSub.statements.filterIsInstance<IFunctionCall>()[0]
+
+        assertIs<NumericLiteralValue>(funCall.args[0],
+            "char literal should have been replaced by ubyte literal")
+        val arg = funCall.args[0] as NumericLiteralValue
+        assertEquals(DataType.UBYTE, arg.type)
+        assertEquals(platform.encodeString("\n", false)[0], arg.number.toShort())
+    }
+
+    @Test
+    fun testCharVarAsRomsubArg() {
+        val platform = Cx16Target
+        val result = compileText(platform, false, """
+            main {
+                romsub ${"$"}FFD2 = chrout(ubyte ch @ A)
+                sub start() {
+                    ubyte ch = '\n'
+                    chrout(ch)
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val funCall = startSub.statements.filterIsInstance<IFunctionCall>()[0]
+
+        assertIs<IdentifierReference>(funCall.args[0])
+        val arg = funCall.args[0] as IdentifierReference
+        val decl = arg.targetVarDecl(program)!!
+        assertEquals(VarDeclType.VAR, decl.type)
+        assertEquals(DataType.UBYTE, decl.datatype)
+
+        // TODO: assertIs<CharLiteral>(decl.value,
+        //          "char literals should be kept until code gen")
+        //       val initializerValue = decl.value as CharLiteral
+        //       assertEquals('\n', (initializerValue as CharLiteral).value)
+
+        assertIs<NumericLiteralValue>(decl.value,
+            "char literal should have been replaced by ubyte literal")
+        val initializerValue = decl.value as NumericLiteralValue
+        assertEquals(DataType.UBYTE, initializerValue.type)
+        assertEquals(platform.encodeString("\n", false)[0], initializerValue.number.toShort())
+    }
+
+    @Test
+    fun testCharConstAsRomsubArg() {
+        val platform = Cx16Target
+        val result = compileText(platform, false, """
+            main {
+                romsub ${"$"}FFD2 = chrout(ubyte ch @ A)
+                sub start() {
+                    const ubyte ch = '\n'
+                    chrout(ch)
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val funCall = startSub.statements.filterIsInstance<IFunctionCall>()[0]
+
+        // Now, both is ok for the arg: a) still the IdRef or b) replaced by numeric literal
+        when (val arg = funCall.args[0]) {
+            is IdentifierReference -> {
+                val decl = arg.targetVarDecl(program)!!
+                assertEquals(VarDeclType.CONST, decl.type)
+                assertEquals(DataType.UBYTE, decl.datatype)
+                assertEquals(
+                    platform.encodeString("\n", false)[0],
+                    (decl.value as NumericLiteralValue).number.toShort())
+            }
+            is NumericLiteralValue -> {
+                assertEquals(
+                    platform.encodeString("\n", false)[0],
+                    arg.number.toShort())
+            }
+            else -> assertIs<IdentifierReference>(funCall.args[0]) // make test fail
+        }
+    }
+
+}
+

compiler/test/TestCompilerOnExamples.kt

@@ -0,0 +1,121 @@
+package prog8tests
+
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.DynamicTest
+import org.junit.jupiter.api.DynamicTest.dynamicTest
+import org.junit.jupiter.api.TestFactory
+import org.junit.jupiter.api.TestInstance
+import prog8.compiler.compileProgram
+import prog8.compiler.target.C64Target
+import prog8.compiler.target.Cx16Target
+import prog8.compiler.target.ICompilationTarget
+import prog8tests.helpers.*
+import kotlin.io.path.absolute
+import kotlin.io.path.exists
+
+
+/**
+ * ATTENTION: this is just kludge!
+ * They are not really unit tests, but rather tests of the whole process,
+ * from source file loading all the way through to running 64tass.
+ */
+// @Disabled("disable to save some time")
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCompilerOnExamples {
+    private val examplesDir = assumeDirectory(workingDir, "../examples")
+
+    private fun makeDynamicCompilerTest(name: String, platform: ICompilationTarget, optimize: Boolean) : DynamicTest {
+        val searchIn = mutableListOf(examplesDir)
+        if (platform == Cx16Target) {
+            searchIn.add(0, assumeDirectory(examplesDir, "cx16"))
+        }
+        val filepath = searchIn
+            .map { it.resolve("$name.p8") }
+            .map { it.normalize().absolute() }
+            .map { workingDir.relativize(it) }
+            .first { it.exists() }
+        val displayName = "${examplesDir.relativize(filepath.absolute())}: ${platform.name}, optimize=$optimize"
+        return dynamicTest(displayName) {
+            compileProgram(
+                filepath,
+                optimize,
+                writeAssembly = true,
+                slowCodegenWarnings = false,
+                compilationTarget = platform.name,
+                sourceDirs = listOf(),
+                outputDir
+            ).assertSuccess("; $displayName")
+        }
+    }
+
+    @TestFactory
+// @Disabled("disable to save some time")
+    fun bothCx16AndC64() = mapCombinations(
+        dim1 = listOf(
+            "animals",
+            "balls",
+            "cube3d",
+            "cube3d-float",
+            "cube3d-gfx",
+            "cxlogo",
+            "dirlist",
+            "fibonacci",
+            "line-circle-gfx",
+            "line-circle-txt",
+            "mandelbrot",
+            "mandelbrot-gfx",
+            "numbergame",
+            "primes",
+            "rasterbars",
+            "screencodes",
+            "sorting",
+            "swirl",
+            "swirl-float",
+            "tehtriz",
+            "textelite",
+        ),
+        dim2 = listOf(Cx16Target, C64Target),
+        dim3 = listOf(false, true),
+        combine3 = ::makeDynamicCompilerTest
+    )
+
+    @TestFactory
+// @Disabled("disable to save some time")
+    fun onlyC64() = mapCombinations(
+        dim1 = listOf(
+            "balloonflight",
+            "bdmusic",
+            "bdmusic-irq",
+            "charset",
+            "cube3d-sprites",
+            "plasma",
+            "sprites",
+            "turtle-gfx",
+            "wizzine",
+        ),
+        dim2 = listOf(C64Target),
+        dim3 = listOf(false, true),
+        combine3 = ::makeDynamicCompilerTest
+    )
+
+    @TestFactory
+// @Disabled("disable to save some time")
+    fun onlyCx16() = mapCombinations(
+        dim1 = listOf(
+            "vtui/testvtui",
+            "amiga",
+            "bobs",
+            "cobramk3-gfx",
+            "colorbars",
+            "datetime",
+            "highresbitmap",
+            "kefrenbars",
+            "mandelbrot-gfx-colors",
+            "multipalette",
+            "testgfx2",
+        ),
+        dim2 = listOf(Cx16Target),
+        dim3 = listOf(false, true),
+        combine3 = ::makeDynamicCompilerTest
+    )
+}

compiler/test/TestCompilerOnImportsAndIncludes.kt

@@ -0,0 +1,126 @@
+package prog8tests
+
+import org.junit.jupiter.api.*
+import org.junit.jupiter.api.DynamicTest.dynamicTest
+import prog8.ast.expressions.AddressOf
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.StringLiteralValue
+import prog8.ast.statements.FunctionCallStatement
+import prog8.ast.statements.Label
+import prog8.compiler.target.Cx16Target
+import prog8tests.helpers.*
+import kotlin.io.path.name
+import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
+
+
+/**
+ * ATTENTION: this is just kludge!
+ * They are not really unit tests, but rather tests of the whole process,
+ * from source file loading all the way through to running 64tass.
+ */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCompilerOnImportsAndIncludes {
+
+    @Nested
+    inner class Import {
+
+        @Test
+        fun testImportFromSameFolder() {
+            val filepath = assumeReadableFile(fixturesDir, "importFromSameFolder.p8")
+            assumeReadableFile(fixturesDir, "foo_bar.p8")
+
+            val platform = Cx16Target
+            val result = compileFile(platform, optimize = false, fixturesDir, filepath.name)
+                .assertSuccess()
+
+            val program = result.programAst
+            val startSub = program.entrypoint
+            val strLits = startSub.statements
+                .filterIsInstance<FunctionCallStatement>()
+                .map { it.args[0] as IdentifierReference }
+                .map { it.targetVarDecl(program)!!.value as StringLiteralValue }
+
+            assertEquals("main.bar", strLits[0].value)
+            assertEquals("foo.bar", strLits[1].value)
+            assertEquals("main", strLits[0].definingScope.name)
+            assertEquals("foo", strLits[1].definingScope.name)
+        }
+    }
+
+    @Nested
+    inner class AsmInclude {
+        @Test
+        fun testAsmIncludeFromSameFolder() {
+            val filepath = assumeReadableFile(fixturesDir, "asmIncludeFromSameFolder.p8")
+            assumeReadableFile(fixturesDir, "foo_bar.asm")
+
+            val platform = Cx16Target
+            val result = compileFile(platform, optimize = false, fixturesDir, filepath.name)
+                .assertSuccess()
+
+            val program = result.programAst
+            val startSub = program.entrypoint
+            val args = startSub.statements
+                .filterIsInstance<FunctionCallStatement>()
+                .map { it.args[0] }
+
+            val str0 = (args[0] as IdentifierReference).targetVarDecl(program)!!.value as StringLiteralValue
+            assertEquals("main.bar", str0.value)
+            assertEquals("main", str0.definingScope.name)
+
+            val id1 = (args[1] as AddressOf).identifier
+            val lbl1 = id1.targetStatement(program) as Label
+            assertEquals("foo_bar", lbl1.name)
+            assertEquals("start", lbl1.definingScope.name)
+        }
+    }
+
+    @Nested
+    inner class Asmbinary {
+        @Test
+        fun testAsmbinaryDirectiveWithNonExistingFile() {
+            val p8Path = assumeReadableFile(fixturesDir, "asmBinaryNonExisting.p8")
+            assumeNotExists(fixturesDir, "i_do_not_exist.bin")
+
+            compileFile(Cx16Target, false, p8Path.parent, p8Path.name, outputDir)
+                .assertFailure()
+        }
+
+        @Test
+        fun testAsmbinaryDirectiveWithNonReadableFile() {
+            val p8Path = assumeReadableFile(fixturesDir, "asmBinaryNonReadable.p8")
+            assumeDirectory(fixturesDir, "subFolder")
+
+            compileFile(Cx16Target, false, p8Path.parent, p8Path.name, outputDir)
+                .assertFailure()
+        }
+
+        @TestFactory
+        fun asmbinaryDirectiveWithExistingBinFile(): Iterable<DynamicTest> =
+            listOf(
+                Triple("same ", "asmBinaryFromSameFolder.p8", "do_nothing1.bin"),
+                Triple("sub", "asmBinaryFromSubFolder.p8", "subFolder/do_nothing2.bin"),
+            ).map {
+                val (where, p8Str, binStr) = it
+                dynamicTest("%asmbinary from ${where}folder") {
+                    val p8Path = assumeReadableFile(fixturesDir, p8Str)
+                    val binPath = assumeReadableFile(fixturesDir, binStr)
+                    assertNotEquals( // the bug we're testing for (#54) was hidden if outputDir == workinDir
+                        workingDir.normalize().toAbsolutePath(),
+                        outputDir.normalize().toAbsolutePath(),
+                        "sanity check: workingDir and outputDir should not be the same folder"
+                    )
+
+                    compileFile(Cx16Target, false, p8Path.parent, p8Path.name, outputDir)
+                        .assertSuccess(
+                            "argument to assembler directive .binary " +
+                                    "should be relative to the generated .asm file (in output dir), " +
+                                    "NOT relative to .p8 neither current working dir"
+                        )
+                }
+            }
+
+    }
+
+}

compiler/test/TestCompilerOnRanges.kt

@@ -0,0 +1,264 @@
+package prog8tests
+
+import org.junit.jupiter.api.DynamicTest.dynamicTest
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestFactory
+import org.junit.jupiter.api.TestInstance
+import prog8.ast.base.DataType
+import prog8.ast.expressions.*
+import prog8.ast.statements.ForLoop
+import prog8.ast.statements.Subroutine
+import prog8.ast.statements.VarDecl
+import prog8.compiler.astprocessing.size
+import prog8.compiler.astprocessing.toConstantIntegerRange
+import prog8.compiler.target.C64Target
+import prog8.compiler.target.Cx16Target
+import prog8tests.helpers.assertFailure
+import prog8tests.helpers.assertSuccess
+import prog8tests.helpers.compileText
+import prog8tests.helpers.mapCombinations
+import kotlin.test.assertEquals
+
+
+/**
+ * ATTENTION: this is just kludge!
+ * They are not really unit tests, but rather tests of the whole process,
+ * from source file loading all the way through to running 64tass.
+ */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCompilerOnRanges {
+
+    @Test
+    fun testUByteArrayInitializerWithRange_char_to_char() {
+        val platform = Cx16Target
+        val result = compileText(platform, true, """
+            main {
+                sub start() {
+                    ubyte[] cs = @'a' to 'z' ; values are computed at compile time 
+                    cs[0] = 23 ; keep optimizer from removing it
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val decl = startSub
+            .statements.filterIsInstance<VarDecl>()[0]
+        val rhsValues = (decl.value as ArrayLiteralValue)
+            .value // Array<Expression>
+            .map { (it as NumericLiteralValue).number.toInt() }
+        val expectedStart = platform.encodeString("a", true)[0].toInt()
+        val expectedEnd = platform.encodeString("z", false)[0].toInt()
+        val expectedStr = "$expectedStart .. $expectedEnd"
+
+        val actualStr = "${rhsValues.first()} .. ${rhsValues.last()}"
+        assertEquals(expectedStr, actualStr,".first .. .last")
+        assertEquals(expectedEnd - expectedStart + 1, rhsValues.last() - rhsValues.first() + 1, "rangeExpr.size()")
+    }
+
+    @Test
+    fun testFloatArrayInitializerWithRange_char_to_char() {
+        val platform = C64Target
+        val result = compileText(platform, optimize = false, """
+            %option enable_floats
+            main {
+                sub start() {
+                    float[] cs = 'a' to 'z' ; values are computed at compile time 
+                    cs[0] = 23 ; keep optimizer from removing it
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val decl = startSub
+            .statements.filterIsInstance<VarDecl>()[0]
+        val rhsValues = (decl.value as ArrayLiteralValue)
+            .value // Array<Expression>
+            .map { (it as NumericLiteralValue).number.toInt() }
+        val expectedStart = platform.encodeString("a", false)[0].toInt()
+        val expectedEnd = platform.encodeString("z", false)[0].toInt()
+        val expectedStr = "$expectedStart .. $expectedEnd"
+
+        val actualStr = "${rhsValues.first()} .. ${rhsValues.last()}"
+        assertEquals(expectedStr, actualStr,".first .. .last")
+        assertEquals(expectedEnd - expectedStart + 1, rhsValues.size, "rangeExpr.size()")
+    }
+
+    fun Subroutine.decl(varName: String): VarDecl {
+        return statements.filterIsInstance<VarDecl>()
+            .first { it.name == varName }
+    }
+    inline fun <reified T : Expression> VarDecl.rhs() : T {
+        return value as T
+    }
+    inline fun <reified T : Expression> ArrayLiteralValue.elements() : List<T> {
+        return value.map { it as T }
+    }
+
+    fun <N : Number> assertEndpoints(expFirst: N, expLast: N, actual: Iterable<N>, msg: String = ".first .. .last") {
+        val expectedStr = "$expFirst .. $expLast"
+        val actualStr = "${actual.first()} .. ${actual.last()}"
+        assertEquals(expectedStr, actualStr,".first .. .last")
+    }
+
+
+    @TestFactory
+    fun floatArrayInitializerWithRange() = mapCombinations(
+        dim1 = listOf("", "42", "41"),                 // sizeInDecl
+        dim2 = listOf("%option enable_floats", ""),    // optEnableFloats
+        dim3 = listOf(Cx16Target, C64Target),          // platform
+        dim4 = listOf(false, true),                    // optimize
+        combine4 = { sizeInDecl, optEnableFloats, platform, optimize ->
+            val displayName =
+                "test failed for: " +
+                when (sizeInDecl) {
+                    "" -> "no"
+                    "42" -> "correct"
+                    else -> "wrong"
+                } + " array size given" +
+                ", " + (if (optEnableFloats == "") "without" else "with") + " %option enable_floats" +
+                ", ${platform.name}, optimize: $optimize"
+            dynamicTest(displayName) {
+                val result = compileText(platform, optimize, """
+                    $optEnableFloats
+                    main {
+                        sub start() {
+                            float[$sizeInDecl] cs = 1 to 42 ; values are computed at compile time 
+                            cs[0] = 23 ; keep optimizer from removing it
+                        }
+                    }
+                """)
+                if (optEnableFloats != "" && (sizeInDecl=="" || sizeInDecl=="42"))
+                    result.assertSuccess()
+                else
+                    result.assertFailure()
+            }
+        }
+    )
+
+    @Test
+    fun testForLoopWithRange_char_to_char() {
+        val platform = Cx16Target
+        val result = compileText(platform, optimize = true, """
+            main {
+                sub start() {
+                    ubyte i
+                    for i in @'a' to 'f' {
+                        i += i ; keep optimizer from removing it
+                    }
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val iterable = startSub
+            .statements.filterIsInstance<ForLoop>()
+            .map { it.iterable }[0]
+        val rangeExpr = iterable as RangeExpr
+
+        val expectedStart = platform.encodeString("a", true)[0].toInt()
+        val expectedEnd = platform.encodeString("f", false)[0].toInt()
+        val expectedStr = "$expectedStart .. $expectedEnd"
+
+        val intProgression = rangeExpr.toConstantIntegerRange(platform)
+        val actualStr = "${intProgression?.first} .. ${intProgression?.last}"
+        assertEquals(expectedStr, actualStr,".first .. .last")
+        assertEquals(expectedEnd - expectedStart + 1, rangeExpr.size(platform), "rangeExpr.size()")
+    }
+
+    @Test
+    fun testForLoopWithRange_bool_to_bool() {
+        val platform = Cx16Target
+        val result = compileText(platform, optimize = true, """
+            main {
+                sub start() {
+                    ubyte i
+                    for i in false to true {
+                        i += i ; keep optimizer from removing it
+                    }
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val rangeExpr = startSub
+            .statements.filterIsInstance<ForLoop>()
+            .map { it.iterable }
+            .filterIsInstance<RangeExpr>()[0]
+
+        assertEquals(2, rangeExpr.size(platform))
+        val intProgression = rangeExpr.toConstantIntegerRange(platform)
+        assertEquals(0, intProgression?.first)
+        assertEquals(1, intProgression?.last)
+    }
+
+    @Test
+    fun testForLoopWithRange_ubyte_to_ubyte() {
+        val platform = Cx16Target
+        val result = compileText(platform, optimize = true, """
+            main {
+                sub start() {
+                    ubyte i
+                    for i in 1 to 9 {
+                        i += i ; keep optimizer from removing it
+                    }
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val rangeExpr = startSub
+            .statements.filterIsInstance<ForLoop>()
+            .map { it.iterable }
+            .filterIsInstance<RangeExpr>()[0]
+
+        assertEquals(9, rangeExpr.size(platform))
+        val intProgression = rangeExpr.toConstantIntegerRange(platform)
+        assertEquals(1, intProgression?.first)
+        assertEquals(9, intProgression?.last)
+    }
+
+    @Test
+    fun testForLoopWithRange_str_downto_str() {
+        compileText(Cx16Target, true, """
+            main {
+                sub start() {
+                    ubyte i
+                    for i in "start" downto "end" {
+                        i += i ; keep optimizer from removing it
+                    }
+                }
+            }
+        """).assertFailure()
+        //TODO("test exact compile error(s)")
+    }
+
+    @Test
+    fun testForLoopWithIterable_str() {
+        val result = compileText(Cx16Target, false, """
+            main {
+                sub start() {
+                    ubyte i
+                    for i in "something" {
+                        i += i ; keep optimizer from removing it
+                    }
+                }
+            }
+        """).assertSuccess()
+
+        val program = result.programAst
+        val startSub = program.entrypoint
+        val iterable = startSub
+            .statements.filterIsInstance<ForLoop>()
+            .map { it.iterable }
+            .filterIsInstance<IdentifierReference>()[0]
+
+        assertEquals(DataType.STR, iterable.inferType(program).getOr(DataType.UNDEFINED))
+    }
+
+}
+

compiler/test/TestCompilerOptionLibdirs.kt

@@ -0,0 +1,96 @@
+package prog8tests
+
+import org.junit.jupiter.api.AfterAll
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import prog8.compiler.compileProgram
+import prog8.compiler.target.Cx16Target
+import prog8tests.helpers.*
+import java.nio.file.Path
+import kotlin.io.path.absolute
+import kotlin.io.path.createTempFile
+import kotlin.io.path.deleteExisting
+import kotlin.io.path.writeText
+
+/**
+ * ATTENTION: this is just kludge!
+ * They are not really unit tests, but rather tests of the whole process,
+ * from source file loading all the way through to running 64tass.
+ */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestCompilerOptionSourcedirs {
+
+    private lateinit var tempFileInWorkingDir: Path
+
+    @BeforeAll
+    fun setUp() {
+        tempFileInWorkingDir = createTempFile(directory = workingDir, prefix = "tmp_", suffix = ".p8")
+            .also { it.writeText("""
+                main {
+                    sub start() {
+                    }
+                }
+            """)}
+    }
+
+    @AfterAll
+    fun tearDown() {
+        tempFileInWorkingDir.deleteExisting()
+    }
+
+    private fun compileFile(filePath: Path, sourceDirs: List<String>) =
+        compileProgram(
+            filepath = filePath,
+            optimize = false,
+            writeAssembly = true,
+            slowCodegenWarnings = false,
+            compilationTarget = Cx16Target.name,
+            sourceDirs,
+            outputDir
+        )
+
+    @Test
+    fun testAbsoluteFilePathInWorkingDir() {
+        val filepath = assumeReadableFile(tempFileInWorkingDir.absolute())
+        compileFile(filepath, listOf())
+            .assertSuccess()
+    }
+
+    @Test
+    fun testFilePathInWorkingDirRelativeToWorkingDir() {
+        val filepath = assumeReadableFile(workingDir.relativize(tempFileInWorkingDir.absolute()))
+        compileFile(filepath, listOf())
+            .assertSuccess()
+    }
+
+    @Test
+    fun testFilePathInWorkingDirRelativeTo1stInSourcedirs() {
+        val filepath = assumeReadableFile(tempFileInWorkingDir)
+        compileFile(filepath.fileName, listOf(workingDir.toString()))
+            .assertSuccess()
+    }
+
+    @Test
+    fun testAbsoluteFilePathOutsideWorkingDir() {
+        val filepath = assumeReadableFile(fixturesDir, "simple_main.p8")
+        compileFile(filepath.absolute(), listOf())
+            .assertSuccess()
+    }
+
+    @Test
+    fun testFilePathOutsideWorkingDirRelativeToWorkingDir() {
+        val filepath = workingDir.relativize(assumeReadableFile(fixturesDir, "simple_main.p8").absolute())
+        compileFile(filepath, listOf())
+            .assertSuccess()
+    }
+
+    @Test
+    fun testFilePathOutsideWorkingDirRelativeTo1stInSourcedirs() {
+        val filepath = assumeReadableFile(fixturesDir, "simple_main.p8")
+        val sourcedirs = listOf("$fixturesDir")
+        compileFile(filepath.fileName, sourcedirs)
+            .assertSuccess()
+    }
+
+}

compiler/test/TestImportedModulesOrderAndOptions.kt

@@ -0,0 +1,104 @@
+package prog8tests
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import prog8.ast.internedStringsModuleName
+import prog8.compiler.ErrorReporter
+import prog8.compiler.ZeropageType
+import prog8.compiler.determineCompilationOptions
+import prog8.compiler.parseImports
+import prog8.compiler.target.C64Target
+import prog8tests.helpers.assertSuccess
+import prog8tests.helpers.compileText
+import prog8tests.helpers.outputDir
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestImportedModulesOrderAndOptions {
+
+    @Test
+    fun testImportedModuleOrderAndMainModuleCorrect() {
+        val result = compileText(C64Target, false, """
+%import textio
+%import floats
+
+main {
+    sub start() {
+        ; nothing
+    }
+}
+""").assertSuccess()
+        assertTrue(result.programAst.toplevelModule.name.startsWith("on_the_fly_test"))
+
+        val moduleNames = result.programAst.modules.map { it.name }
+        assertTrue(moduleNames[0].startsWith("on_the_fly_test"), "main module must be first")
+        assertEquals(listOf(
+            "prog8_interned_strings",
+            "textio",
+            "syslib",
+            "conv",
+            "floats",
+            "math",
+            "prog8_lib"
+        ), moduleNames.drop(1), "module order in parse tree")
+
+        assertTrue(result.programAst.toplevelModule.name.startsWith("on_the_fly_test"))
+    }
+
+    @Test
+    fun testCompilationOptionsCorrectFromMain() {
+        val result = compileText(C64Target, false, """
+%import textio
+%import floats
+%zeropage dontuse
+%option no_sysinit
+
+main {
+    sub start() {
+        ; nothing
+    }
+}
+""").assertSuccess()
+        assertTrue(result.programAst.toplevelModule.name.startsWith("on_the_fly_test"))
+        val options = determineCompilationOptions(result.programAst, C64Target)
+        assertTrue(options.floats)
+        assertEquals(ZeropageType.DONTUSE, options.zeropage)
+        assertTrue(options.noSysInit)
+    }
+
+    @Test
+    fun testModuleOrderAndCompilationOptionsCorrectWithJustImports() {
+        val errors = ErrorReporter()
+        val sourceText = """
+%import textio
+%import floats
+%option no_sysinit
+%zeropage dontuse            
+
+main {
+    sub start() {
+        ; nothing
+    }
+}
+"""
+        val filenameBase = "on_the_fly_test_" + sourceText.hashCode().toUInt().toString(16)
+        val filepath = outputDir.resolve("$filenameBase.p8")
+        filepath.toFile().writeText(sourceText)
+        val (program, options, importedfiles) = parseImports(filepath, errors, C64Target, emptyList())
+
+        assertEquals(filenameBase, program.toplevelModule.name)
+        assertEquals(1, importedfiles.size, "all imports other than the test source must have been internal resources library files")
+        assertEquals(listOf(
+            internedStringsModuleName,
+            filenameBase,
+            "textio", "syslib", "conv", "floats", "math", "prog8_lib"
+        ), program.modules.map {it.name}, "module order in parse tree")
+        assertTrue(options.floats)
+        assertEquals(ZeropageType.DONTUSE, options.zeropage, "zeropage option must be correctly taken from main module, not from float module import logic")
+        assertTrue(options.noSysInit)
+    }
+
+
+}

compiler/test/TestMemory.kt

@@ -1,57 +1,51 @@
 package prog8tests
 
 import org.junit.jupiter.api.Test
-import prog8.ast.IBuiltinFunctions
-import prog8.ast.IMemSizer
+import org.junit.jupiter.api.TestInstance
 import prog8.ast.Module
 import prog8.ast.Program
 import prog8.ast.base.DataType
-import prog8.ast.base.ParentSentinel
 import prog8.ast.base.Position
 import prog8.ast.base.VarDeclType
-import prog8.ast.expressions.*
+import prog8.ast.expressions.ArrayIndexedExpression
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.NumericLiteralValue
+import prog8.ast.expressions.PrefixExpression
 import prog8.ast.statements.*
+import prog8.compiler.astprocessing.isInRegularRAMof
 import prog8.compiler.target.C64Target
-import java.nio.file.Path
+import prog8.parser.SourceCode
+import prog8tests.helpers.DummyFunctions
+import prog8tests.helpers.DummyMemsizer
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
 
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class TestMemory {
-    private class DummyFunctions: IBuiltinFunctions {
-        override val names: Set<String> = emptySet()
-        override val purefunctionNames: Set<String> = emptySet()
-        override fun constValue(name: String, args: List<Expression>, position: Position, memsizer: IMemSizer): NumericLiteralValue? = null
-        override fun returnType(name: String, args: MutableList<Expression>) = InferredTypes.InferredType.unknown()
-    }
-
-    private class DummyMemsizer: IMemSizer {
-        override fun memorySize(dt: DataType): Int = 0
-    }
 
     @Test
     fun testInValidRamC64_memory_addresses() {
 
         var memexpr = NumericLiteralValue.optimalInteger(0x0000, Position.DUMMY)
         var target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        val program = Program("test", mutableListOf(), DummyFunctions(), DummyMemsizer())
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0x1000, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0x9fff, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0xc000, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0xcfff, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -59,47 +53,45 @@ class TestMemory {
 
         var memexpr = NumericLiteralValue.optimalInteger(0xa000, Position.DUMMY)
         var target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        val program = Program("test", mutableListOf(), DummyFunctions(), DummyMemsizer())
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0xafff, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0xd000, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
 
         memexpr = NumericLiteralValue.optimalInteger(0xffff, Position.DUMMY)
         target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
     fun testInValidRamC64_memory_identifiers() {
-        var target = createTestProgramForMemoryRefViaVar(0x1000, VarDeclType.VAR)
-        val program = Program("test", mutableListOf(), DummyFunctions(), DummyMemsizer())
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+        var target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.VAR)
 
-        assertTrue(C64Target.isInRegularRAM(target, program))
-        target = createTestProgramForMemoryRefViaVar(0xd020, VarDeclType.VAR)
-        assertFalse(C64Target.isInRegularRAM(target, program))
-        target = createTestProgramForMemoryRefViaVar(0x1000, VarDeclType.CONST)
-        assertTrue(C64Target.isInRegularRAM(target, program))
-        target = createTestProgramForMemoryRefViaVar(0xd020, VarDeclType.CONST)
-        assertFalse(C64Target.isInRegularRAM(target, program))
-        target = createTestProgramForMemoryRefViaVar(0x1000, VarDeclType.MEMORY)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.VAR)
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.CONST)
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.CONST)
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.MEMORY)
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
     }
 
-    @Test
-    private fun createTestProgramForMemoryRefViaVar(address: Int, vartype: VarDeclType): AssignTarget {
+    private fun createTestProgramForMemoryRefViaVar(program: Program, address: Int, vartype: VarDeclType): AssignTarget {
         val decl = VarDecl(vartype, DataType.BYTE, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
         val memexpr = IdentifierReference(listOf("address"), Position.DUMMY)
         val target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        module.linkParents(ParentSentinel)
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        module.linkIntoProgram(program)
         return target
     }
 
@@ -107,8 +99,7 @@ class TestMemory {
     fun testInValidRamC64_memory_expression() {
         val memexpr = PrefixExpression("+", NumericLiteralValue.optimalInteger(0x1000, Position.DUMMY), Position.DUMMY)
         val target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        val program = Program("test", mutableListOf(), DummyFunctions(), DummyMemsizer())
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -117,10 +108,11 @@ class TestMemory {
         val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -130,10 +122,11 @@ class TestMemory {
         val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -143,10 +136,11 @@ class TestMemory {
         val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -156,10 +150,11 @@ class TestMemory {
         val target = AssignTarget(null, arrayindexed, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -170,10 +165,11 @@ class TestMemory {
         val target = AssignTarget(null, arrayindexed, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertTrue(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertTrue(target.isInRegularRAMof(C64Target.machine))
     }
 
     @Test
@@ -184,9 +180,10 @@ class TestMemory {
         val target = AssignTarget(null, arrayindexed, null, Position.DUMMY)
         val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
         val subroutine = Subroutine("test", emptyList(), emptyList(), emptyList(), emptyList(), emptySet(), null, false, false, mutableListOf(decl, assignment), Position.DUMMY)
-        val module = Module("test", mutableListOf(subroutine), Position.DUMMY, false, Path.of(""))
-        val program = Program("test", mutableListOf(module), DummyFunctions(), DummyMemsizer())
-        module.linkParents(ParentSentinel)
-        assertFalse(C64Target.isInRegularRAM(target, program))
+        val module = Module(mutableListOf(subroutine), Position.DUMMY, SourceCode.Generated("test"))
+        val program = Program("test", DummyFunctions, DummyMemsizer)
+            .addModule(module)
+        module.linkIntoProgram(program)
+        assertFalse(target.isInRegularRAMof(C64Target.machine))
     }
 }

compiler/test/TestNumericLiteralValue.kt

@@ -13,8 +13,6 @@ import kotlin.test.assertFalse
 import kotlin.test.assertNotEquals
 import kotlin.test.assertTrue
 
-
-
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class TestNumericLiteralValue {
 

compiler/test/TestOptimization.kt

@@ -0,0 +1,62 @@
+package prog8tests
+
+import org.hamcrest.CoreMatchers.instanceOf
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import prog8.ast.statements.Block
+import prog8.ast.statements.Return
+import prog8.ast.statements.Subroutine
+import prog8.compiler.target.C64Target
+import prog8tests.helpers.assertSuccess
+import prog8tests.helpers.compileText
+import kotlin.test.assertEquals
+import kotlin.test.assertSame
+import kotlin.test.assertTrue
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class TestOptimization {
+    @Test
+    fun testRemoveEmptySubroutineExceptStart() {
+        val sourcecode = """
+            main {
+                sub start() {
+                }
+                sub empty() {
+                    ; going to be removed
+                }
+            }
+        """
+        val result = compileText(C64Target, true, sourcecode).assertSuccess()
+        val toplevelModule = result.programAst.toplevelModule
+        val mainBlock = toplevelModule.statements.single() as Block
+        val startSub = mainBlock.statements.single() as Subroutine
+        assertSame(result.programAst.entrypoint, startSub)
+        assertEquals("start", startSub.name, "only start sub should remain")
+        assertTrue(startSub.statements.single() is Return, "compiler has inserted return in empty subroutines")
+    }
+
+    @Test
+    fun testDontRemoveEmptySubroutineIfItsReferenced() {
+        val sourcecode = """
+            main {
+                sub start() {
+                    uword xx = &empty
+                    xx++
+                }
+                sub empty() {
+                    ; should not be removed
+                }
+            }
+        """
+        val result = compileText(C64Target, true, sourcecode).assertSuccess()
+        val toplevelModule = result.programAst.toplevelModule
+        val mainBlock = toplevelModule.statements.single() as Block
+        val startSub = mainBlock.statements[0] as Subroutine
+        val emptySub = mainBlock.statements[1] as Subroutine
+        assertSame(result.programAst.entrypoint, startSub)
+        assertEquals("start", startSub.name)
+        assertEquals("empty", emptySub.name)
+        assertTrue(emptySub.statements.single() is Return, "compiler has inserted return in empty subroutines")
+    }
+}

compiler/test/TestPetscii.kt

@@ -1,5 +1,6 @@
 package prog8tests
 
+import com.github.michaelbull.result.Ok
 import org.hamcrest.MatcherAssert.assertThat
 import org.hamcrest.Matchers.equalTo
 import org.junit.jupiter.api.Test
@@ -17,8 +18,8 @@ class TestPetscii {
 
     @Test
     fun testZero() {
-        assertThat(Petscii.encodePetscii("\u0000", true), equalTo(listOf<Short>(0)))
-        assertThat(Petscii.encodePetscii("\u0000", false), equalTo(listOf<Short>(0)))
+        assertThat(Petscii.encodePetscii("\u0000", true), equalTo(Ok(listOf<Short>(0))))
+        assertThat(Petscii.encodePetscii("\u0000", false), equalTo(Ok(listOf<Short>(0))))
         assertThat(Petscii.decodePetscii(listOf(0), true), equalTo("\u0000"))
         assertThat(Petscii.decodePetscii(listOf(0), false), equalTo("\u0000"))
     }
@@ -26,11 +27,11 @@ class TestPetscii {
     @Test
     fun testLowercase() {
         assertThat(Petscii.encodePetscii("hello WORLD 123 @!£", true), equalTo(
-                listOf<Short>(72, 69, 76, 76, 79, 32, 0xd7, 0xcf, 0xd2, 0xcc, 0xc4, 32, 49, 50, 51, 32, 64, 33, 0x5c)))
-        assertThat(Petscii.encodePetscii("\uf11a", true), equalTo(listOf<Short>(0x12)))   // reverse vid
-        assertThat(Petscii.encodePetscii("✓", true), equalTo(listOf<Short>(0xfa)))
-        assertThat("expect lowercase error fallback", Petscii.encodePetscii("π", true), equalTo(listOf<Short>(255)))
-        assertThat("expect lowercase error fallback", Petscii.encodePetscii("♥", true), equalTo(listOf<Short>(0xd3)))
+                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 0xd7, 0xcf, 0xd2, 0xcc, 0xc4, 32, 49, 50, 51, 32, 64, 33, 0x5c))))
+        assertThat(Petscii.encodePetscii("\uf11a", true), equalTo(Ok(listOf<Short>(0x12))))   // reverse vid
+        assertThat(Petscii.encodePetscii("✓", true), equalTo(Ok(listOf<Short>(0xfa))))
+        assertThat("expect lowercase error fallback", Petscii.encodePetscii("π", true), equalTo(Ok(listOf<Short>(255))))
+        assertThat("expect lowercase error fallback", Petscii.encodePetscii("♥", true), equalTo(Ok(listOf<Short>(0xd3))))
 
         assertThat(Petscii.decodePetscii(listOf(72, 0xd7, 0x5c, 0xfa, 0x12), true), equalTo("hW£✓\uF11A"))
         assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(-1), true) }
@@ -40,11 +41,11 @@ class TestPetscii {
     @Test
     fun testUppercase() {
         assertThat(Petscii.encodePetscii("HELLO 123 @!£"), equalTo(
-                listOf<Short>(72, 69, 76, 76, 79, 32, 49, 50, 51, 32, 64, 33, 0x5c)))
-        assertThat(Petscii.encodePetscii("\uf11a"), equalTo(listOf<Short>(0x12)))   // reverse vid
-        assertThat(Petscii.encodePetscii("♥"), equalTo(listOf<Short>(0xd3)))
-        assertThat(Petscii.encodePetscii("π"), equalTo(listOf<Short>(0xff)))
-        assertThat("expecting fallback", Petscii.encodePetscii("✓"), equalTo(listOf<Short>(250)))
+                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 49, 50, 51, 32, 64, 33, 0x5c))))
+        assertThat(Petscii.encodePetscii("\uf11a"), equalTo(Ok(listOf<Short>(0x12))))   // reverse vid
+        assertThat(Petscii.encodePetscii("♥"), equalTo(Ok(listOf<Short>(0xd3))))
+        assertThat(Petscii.encodePetscii("π"), equalTo(Ok(listOf<Short>(0xff))))
+        assertThat("expecting fallback", Petscii.encodePetscii("✓"), equalTo(Ok(listOf<Short>(250))))
 
         assertThat(Petscii.decodePetscii(listOf(72, 0x5c, 0xd3, 0xff)), equalTo("H£♥π"))
         assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(-1)) }
@@ -54,11 +55,11 @@ class TestPetscii {
     @Test
     fun testScreencodeLowercase() {
         assertThat(Petscii.encodeScreencode("hello WORLD 123 @!£", true), equalTo(
-                listOf<Short>(0x08, 0x05, 0x0c, 0x0c, 0x0f, 0x20, 0x57, 0x4f, 0x52, 0x4c, 0x44, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c)
+                Ok(listOf<Short>(0x08, 0x05, 0x0c, 0x0c, 0x0f, 0x20, 0x57, 0x4f, 0x52, 0x4c, 0x44, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c))
         ))
-        assertThat(Petscii.encodeScreencode("✓", true), equalTo(listOf<Short>(0x7a)))
-        assertThat("expect fallback", Petscii.encodeScreencode("♥", true), equalTo(listOf<Short>(83)))
-        assertThat("expect fallback", Petscii.encodeScreencode("π", true), equalTo(listOf<Short>(94)))
+        assertThat(Petscii.encodeScreencode("✓", true), equalTo(Ok(listOf<Short>(0x7a))))
+        assertThat("expect fallback", Petscii.encodeScreencode("♥", true), equalTo(Ok(listOf<Short>(83))))
+        assertThat("expect fallback", Petscii.encodeScreencode("π", true), equalTo(Ok(listOf<Short>(94))))
 
         assertThat(Petscii.decodeScreencode(listOf(0x08, 0x57, 0x1c, 0x7a), true), equalTo("hW£✓"))
         assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(-1), true) }
@@ -68,12 +69,12 @@ class TestPetscii {
     @Test
     fun testScreencodeUppercase() {
         assertThat(Petscii.encodeScreencode("WORLD 123 @!£"), equalTo(
-                listOf<Short>(0x17, 0x0f, 0x12, 0x0c, 0x04, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c)))
-        assertThat(Petscii.encodeScreencode("♥"), equalTo(listOf<Short>(0x53)))
-        assertThat(Petscii.encodeScreencode("π"), equalTo(listOf<Short>(0x5e)))
-        assertThat(Petscii.encodeScreencode("HELLO"), equalTo(listOf<Short>(8, 5, 12, 12, 15)))
-        assertThat("expecting fallback", Petscii.encodeScreencode("hello"), equalTo(listOf<Short>(8, 5, 12, 12, 15)))
-        assertThat("expecting fallback", Petscii.encodeScreencode("✓"), equalTo(listOf<Short>(122)))
+                Ok(listOf<Short>(0x17, 0x0f, 0x12, 0x0c, 0x04, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c))))
+        assertThat(Petscii.encodeScreencode("♥"), equalTo(Ok(listOf<Short>(0x53))))
+        assertThat(Petscii.encodeScreencode("π"), equalTo(Ok(listOf<Short>(0x5e))))
+        assertThat(Petscii.encodeScreencode("HELLO"), equalTo(Ok(listOf<Short>(8, 5, 12, 12, 15))))
+        assertThat("expecting fallback", Petscii.encodeScreencode("hello"), equalTo(Ok(listOf<Short>(8, 5, 12, 12, 15))))
+        assertThat("expecting fallback", Petscii.encodeScreencode("✓"), equalTo(Ok(listOf<Short>(122))))
 
         assertThat(Petscii.decodeScreencode(listOf(0x17, 0x1c, 0x53, 0x5e)), equalTo("W£♥π"))
         assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(-1)) }

compiler/test/fixtures/asmBinaryFromSameFolder.p8

@@ -0,0 +1,10 @@
+main {
+	sub start() {
+	    stuff.do_nothing()
+	}   
+}
+
+stuff $1000 {
+	romsub $1000 = do_nothing()
+	%asmbinary "do_nothing1.bin", 0
+}