first setup of LSP languageserver

added emudbg.console_nl()

.idea/kotlinc.xml

@@ -7,13 +7,13 @@
     <option name="jvmTarget" value="11" />
   </component>
   <component name="KotlinCommonCompilerArguments">
-    <option name="apiVersion" value="2.1" />
-    <option name="languageVersion" value="2.1" />
+    <option name="apiVersion" value="2.2" />
+    <option name="languageVersion" value="2.2" />
   </component>
   <component name="KotlinCompilerSettings">
-    <option name="additionalArguments" value="-Xwhen-guards" />
+    <option name="additionalArguments" value="-Xwhen-guards -jvm-default=no-compatibility" />
   </component>
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="2.1.10" />
+    <option name="version" value="2.2.0" />
   </component>
 </project>

.idea/libraries/KotlinJavaRuntime.xml

@@ -1,23 +1,23 @@
 <component name="libraryTable">
   <library name="KotlinJavaRuntime" type="repository">
-    <properties maven-id="org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.1.20" />
+    <properties maven-id="org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.2.0" />
     <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.1.20/kotlin-stdlib-jdk8-2.1.20.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.1.20/kotlin-stdlib-2.1.20.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.0/kotlin-stdlib-jdk8-2.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.0/kotlin-stdlib-2.2.0.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-jdk7/2.1.20/kotlin-stdlib-jdk7-2.1.20.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.0/kotlin-stdlib-jdk7-2.2.0.jar!/" />
     </CLASSES>
     <JAVADOC>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.1.20/kotlin-stdlib-jdk8-2.1.20-javadoc.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.1.20/kotlin-stdlib-2.1.20-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.0/kotlin-stdlib-jdk8-2.2.0-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.0/kotlin-stdlib-2.2.0-javadoc.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-javadoc.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.1.20/kotlin-stdlib-jdk7-2.1.20-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.0/kotlin-stdlib-jdk7-2.2.0-javadoc.jar!/" />
     </JAVADOC>
     <SOURCES>
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.1.20/kotlin-stdlib-jdk8-2.1.20-sources.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.1.20/kotlin-stdlib-2.1.20-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/2.2.0/kotlin-stdlib-jdk8-2.2.0-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/2.2.0/kotlin-stdlib-2.2.0-sources.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-sources.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.1.20/kotlin-stdlib-jdk7-2.1.20-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/2.2.0/kotlin-stdlib-jdk7-2.2.0-sources.jar!/" />
     </SOURCES>
   </library>
 </component>

.idea/modules.xml

@@ -15,6 +15,7 @@
       <module fileurl="file://$PROJECT_DIR$/docs/docs.iml" filepath="$PROJECT_DIR$/docs/docs.iml" />
       <module fileurl="file://$PROJECT_DIR$/examples/examples.iml" filepath="$PROJECT_DIR$/examples/examples.iml" />
       <module fileurl="file://$PROJECT_DIR$/intermediate/intermediate.iml" filepath="$PROJECT_DIR$/intermediate/intermediate.iml" />
+      <module fileurl="file://$PROJECT_DIR$/languageServer/languageServer.iml" filepath="$PROJECT_DIR$/languageServer/languageServer.iml" />
       <module fileurl="file://$PROJECT_DIR$/parser/parser.iml" filepath="$PROJECT_DIR$/parser/parser.iml" />
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/prog8.iml" filepath="$PROJECT_DIR$/.idea/modules/prog8.iml" />
       <module fileurl="file://$PROJECT_DIR$/simpleAst/simpleAst.iml" filepath="$PROJECT_DIR$/simpleAst/simpleAst.iml" />

build.gradle.kts

@@ -1,9 +1,10 @@
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.dsl.JvmDefaultMode
 import org.jetbrains.kotlin.gradle.internal.config.LanguageFeature
 
 
 plugins {
-    kotlin("jvm") version "2.1.20"
+    kotlin("jvm") version "2.2.0"
 }
 
 allprojects {
@@ -18,6 +19,7 @@ allprojects {
         compilerOptions {
             freeCompilerArgs = listOf("-Xwhen-guards")
             jvmTarget = JvmTarget.JVM_11
+            jvmDefault = JvmDefaultMode.NO_COMPATIBILITY
         }
         sourceSets.all {
             languageSettings {

codeCore/src/prog8/code/target/VMTarget.kt

@@ -3,6 +3,7 @@ package prog8.code.target
 import prog8.code.core.*
 import prog8.code.target.encodings.Encoder
 import java.nio.file.Path
+import kotlin.io.path.extension
 import kotlin.io.path.isReadable
 import kotlin.io.path.name
 import kotlin.io.path.readText
@@ -73,16 +74,11 @@ class VMTarget: ICompilationTarget,
 
         // to not have external module dependencies in our own module, we launch the virtual machine via reflection
         val vm = Class.forName("prog8.vm.VmRunner").getDeclaredConstructor().newInstance() as IVirtualMachineRunner
-        val filename = programNameWithPath.name
-        if(programNameWithPath.isReadable()) {
-            vm.runProgram(programNameWithPath.readText(), quiet)
-        } else {
-            val withExt = programNameWithPath.resolveSibling("$filename.p8ir")
-            if(withExt.isReadable())
-                vm.runProgram(withExt.readText(), quiet)
-            else
-                throw java.nio.file.NoSuchFileException(withExt.name, null, "not a .p8ir file")
-        }
+        val withExt = if(programNameWithPath.extension=="p8ir") programNameWithPath else programNameWithPath.resolveSibling("${programNameWithPath.name}.p8ir")
+        if(withExt.isReadable())
+            vm.runProgram(withExt.readText(), quiet)
+        else
+            throw java.nio.file.NoSuchFileException(withExt.name, null, "not a .p8ir file")
     }
 
     override fun isIOAddress(address: UInt): Boolean = false

codeGenCpu6502/src/prog8/codegen/cpu6502/ProgramAndVarsGen.kt

@@ -328,10 +328,9 @@ internal class ProgramAndVarsGen(
         if (initializers.isNotEmpty()) {
             asmgen.out("prog8_init_vars\t.block")
             initializers.forEach { assign ->
-                if((assign.value as? PtNumber)?.number != 0.0 || allocator.isZpVar(assign.target.identifier!!.name))
+                val constvalue = assign.value as? PtNumber
+                if(constvalue==null || constvalue.number!=0.0 || allocator.isZpVar(assign.target.identifier!!.name))
                     asmgen.translate(assign)
-                else
-                    throw AssemblyError("non-zp variable should not be initialized to zero; it will be zeroed as part of BSS clear")
                 // the other variables that should be set to zero are done so as part of the BSS section clear.
             }
             asmgen.out("  rts\n  .bend")

codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt

@@ -2491,8 +2491,9 @@ $endLabel""")
             BaseDataType.UBYTE -> {
                 when(targetDt) {
                     BaseDataType.BOOL -> {
+                        val compare = if(regs==RegisterOrPair.A) "cmp" else "cp${regs.toString().lowercase()}"
                         asmgen.out("""
-                            cp${regs.toString().lowercase()}  #0
+                            $compare  #0
                             beq  +
                             ld${regs.toString().lowercase()}  #1
 +                           st${regs.toString().lowercase()}  $targetAsmVarName""")

codeGenIntermediate/src/prog8/codegen/intermediate/IRCodeGen.kt

@@ -70,12 +70,12 @@ class IRCodeGen(
                 val initValue = initialization?.value
                 when(initValue){
                     is PtBool -> {
-                        require(initValue.asInt()!=0) { "boolean var should not be initialized with false, it wil be set to false as part of BSS clear, initializer=$initialization" }
+                        require(initValue.asInt()!=0 || variable.zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) { "non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
                         variable.setOnetimeInitNumeric(initValue.asInt().toDouble())
                         initsToRemove += block to initialization
                     }
                     is PtNumber -> {
-                        require(initValue.number!=0.0) { "variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
+                        require(initValue.number!=0.0 || variable.zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) { "non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
                         variable.setOnetimeInitNumeric(initValue.number)
                         initsToRemove += block to initialization
                     }

codeOptimizers/src/prog8/optimizer/StatementOptimizer.kt

@@ -19,7 +19,7 @@ class StatementOptimizer(private val program: Program,
             val functionName = functionCallStatement.target.nameInSource[0]
             if (functionName in functions.purefunctionNames) {
                 if("ignore_unused" !in parent.definingBlock.options())
-                    errors.info("statement has no effect (function return value is discarded)", functionCallStatement.position)
+                    errors.warn("statement has no effect (function return value is discarded)", functionCallStatement.position)
                 return listOf(IAstModification.Remove(functionCallStatement, parent as IStatementContainer))
             }
         }

compiler/res/prog8lib/c64/graphics.p8

@@ -376,7 +376,7 @@ hline_filled_right   .byte  0, %10000000, %11000000, %11100000, %11110000, %1111
 _ormask     .byte 128, 64, 32, 16, 8, 4, 2, 1
 
 ; note: this can be even faster if we also have a 320 word x-lookup table, but hey, that's a lot of memory.
-; see http://codebase64.org/doku.php?id=base:various_techniques_to_calculate_adresses_fast_common_screen_formats_for_pixel_graphics
+; see https://codebase64.net/doku.php?id=base:various_techniques_to_calculate_adresses_fast_common_screen_formats_for_pixel_graphics
 ; the y lookup tables encodes this formula:  BITMAP_ADDRESS + 320*(py>>3) + (py & 7)    (y from 0..199)
 ; We use the 64tass syntax for range expressions to calculate this table on assembly time.
 

compiler/res/prog8lib/cx16/emudbg.p8

@@ -47,6 +47,12 @@ emudbg {
         }
     }
 
+    sub console_nl() {
+        ; write a newline to the debug output console.
+        ; because '\n' gets encoded in the x16 value for it (13) which is different than what the shell expects (10).
+        console_chrout(10)
+    }
+
     sub console_chrout(ubyte char) {
         ; note: make sure the character is in Iso encoding.
         if is_emulator()

compiler/res/prog8lib/math.asm

@@ -3,7 +3,7 @@
 ;
 ;  some more interesting routines can be found here:
 ;	http://6502org.wikidot.com/software-math
-;	http://codebase64.org/doku.php?id=base:6502_6510_maths
+;	https://codebase64.net/doku.php?id=base:6502_6510_maths
 ;       https://github.com/TobyLobster/multiply_test
 ;       https://github.com/TobyLobster/sqrt_test
 
@@ -353,7 +353,7 @@ _divisor	.word ?
 randword	.proc
 	; -- 16 bit pseudo random number generator into AY
 	;    default seed = $00c2 $1137.  NOTE:  uses self-modifying code so won't work in ROM (use randword_rom instead)
-        ;    routine from https://codebase64.org/doku.php?id=base:x_abc_random_number_generator_8_16_bit
+        ;    routine from https://codebase64.net/doku.php?id=6502_6510_maths:x_abc_random_number_generator_8_16_bit
 		inc x1
 		clc
 x1=*+1
@@ -377,7 +377,7 @@ b1=*+1
 randword_rom	.proc
 	; -- 16 bit pseudo random number generator into AY. Can run from ROM.
 	;    NOTE: you have to set the initial seed using randseed_rom! (a good default seed = $00c2 $1137)
-        ;    routine from https://codebase64.org/doku.php?id=base:x_abc_random_number_generator_8_16_bit
+        ;    routine from https://codebase64.net/doku.php?id=6502_6510_maths:x_abc_random_number_generator_8_16_bit
 		inc  _x1
 		clc
 		lda  _x1

compiler/res/prog8lib/math.p8

@@ -380,7 +380,7 @@ _quadrant_region_to_direction:
 asmsub atan2(ubyte x1 @R0, ubyte y1 @R1, ubyte x2 @R2, ubyte y2 @R3) -> ubyte @A {
     ;; Calculate the angle, in a 256-degree circle, between two points into A.
     ;; The points (x1, y1) and (x2, y2) have to use *unsigned coordinates only* from the positive quadrant in the carthesian plane!
-    ;; https://www.codebase64.org/doku.php?id=base:8bit_atan2_8-bit_angle
+    ;; http://codebase64.net/doku.php?id=base:8bit_atan2_8-bit_angle
     ;; This uses 2 large lookup tables so uses a lot of memory but is super fast.
 
     %asm {{

compiler/res/prog8lib/virtual/diskio.p8

@@ -138,8 +138,8 @@ diskio {
         ;    you can call this multiple times to append more data
         repeat num_bytes {
             %ir {{
-                loadm.w r0,diskio.f_write.bufferpointer
-                loadi.b r99100,r0
+                loadm.w r99000,diskio.f_write.bufferpointer
+                loadi.b r99100,r99000
                 syscall 55 (r99100.b): r99100.b
                 storem.b r99100,$ff02
             }}
@@ -216,12 +216,12 @@ diskio {
     }
 
     ; like save() but omits the 2 byte prg header.
-    sub save_raw(uword filenameptr, uword startaddress, uword savesize) -> bool {
+    sub save_raw(uword filenameptr, uword start_address, uword savesize) -> bool {
         %ir {{
             load.b r99100,1
-            loadm.w r99000,diskio.save.filenameptr
-            loadm.w r99001,diskio.save.start_address
-            loadm.w r99002,diskio.save.savesize
+            loadm.w r99000,diskio.save_raw.filenameptr
+            loadm.w r99001,diskio.save_raw.start_address
+            loadm.w r99002,diskio.save_raw.savesize
             syscall 42 (r99100.b, r99000.w, r99001.w, r99002.w): r99100.b
             returnr.b r99100
         }}

compiler/src/prog8/compiler/Compiler.kt

@@ -468,7 +468,7 @@ private fun processAst(program: Program, errors: IErrorReporter, compilerOptions
     errors.report()
     program.constantFold(errors, compilerOptions)
     errors.report()
-    program.reorderStatements(errors)
+    program.reorderStatements(compilerOptions, errors)
     errors.report()
     program.desugaring(errors, compilerOptions)
     errors.report()

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

@@ -1470,6 +1470,17 @@ internal class AstChecker(private val program: Program,
     }
 
     override fun visit(functionCallStatement: FunctionCallStatement) {
+
+        if(functionCallStatement.target.nameInSource.size==1) {
+            val functionName = functionCallStatement.target.nameInSource[0]
+            if (functionName in program.builtinFunctions.purefunctionNames) {
+                if("ignore_unused" !in functionCallStatement.parent.definingBlock.options()) {
+                    errors.warn("statement has no effect (function return value is discarded)", functionCallStatement.position)
+                    return
+                }
+            }
+        }
+
         // most function calls, even to builtin functions, are still regular FunctionCall nodes here.
         // they get converted to the more specialized node type in BeforeAsmTypecastCleaner
         val targetStatement = functionCallStatement.target.checkFunctionOrLabelExists(program, functionCallStatement, errors)

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

@@ -20,8 +20,8 @@ internal fun Program.checkValid(errors: IErrorReporter, compilerOptions: Compila
     checker.visit(this)
 }
 
-internal fun Program.reorderStatements(errors: IErrorReporter) {
-    val reorder = StatementReorderer(this, errors)
+internal fun Program.reorderStatements(options: CompilationOptions, errors: IErrorReporter) {
+    val reorder = StatementReorderer(this, options, errors)
     reorder.visit(this)
     if(errors.noErrors()) {
         reorder.applyModifications()

compiler/src/prog8/compiler/astprocessing/SimplifiedAstMaker.kt

@@ -165,8 +165,11 @@ class SimplifiedAstMaker(private val program: Program, private val errors: IErro
             }
         }
 
-        if(srcAssign.origin == AssignmentOrigin.VARINIT && srcAssign.parent is Block && srcAssign.value.constValue(program)?.number==0.0)
-            throw FatalAstException("should not have a redundant block-level variable=0 assignment; it will be zeroed as part of BSS clear")
+        if(srcAssign.origin == AssignmentOrigin.VARINIT && srcAssign.parent is Block && srcAssign.value.constValue(program)?.number==0.0) {
+            val zeropages = srcAssign.target.targetIdentifiers().mapNotNull { it.targetVarDecl()?.zeropage }
+            if(zeropages.any {it==ZeropageWish.NOT_IN_ZEROPAGE})
+                throw FatalAstException("should not have a redundant block-level variable=0 assignment for a non-ZP variable; it will be zeroed as part of BSS clear")
+        }
 
         val assign = PtAssignment(srcAssign.position, srcAssign.origin==AssignmentOrigin.VARINIT)
         val multi = srcAssign.target.multi

compiler/src/prog8/compiler/astprocessing/SimplifiedAstPostprocess.kt

@@ -133,7 +133,7 @@ private fun integrateDefers(subdefers: Map<PtSub, List<PtDefer>>, program: PtPro
         is PtNumber,
         is PtRange,
         is PtString -> true
-        // note that unlike most other times, PtIdentifier IS "complex" this time (it's a variable that might change)
+        is PtIdentifier -> true    // actually PtIdentifier IS "complex" this time (it's a variable that might change) but it's kinda annoying to give a warning message for this very common case
         else -> false
     }
 

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

@@ -5,13 +5,11 @@ import prog8.ast.expressions.*
 import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
-import prog8.code.core.AssociativeOperators
-import prog8.code.core.BaseDataType
-import prog8.code.core.DataType
-import prog8.code.core.IErrorReporter
+import prog8.code.core.*
 
 internal class StatementReorderer(
     val program: Program,
+    val options: CompilationOptions,
     val errors: IErrorReporter
 ) : AstWalker() {
     // Reorders the statements in a way the compiler needs.
@@ -114,10 +112,17 @@ internal class StatementReorderer(
     }
 
     private fun canSkipInitializationWith0(decl: VarDecl): Boolean {
-        // if the variable is declared in a block, we can omit the init with 0 because
-        // the variable will be initialized to zero when the BSS section is cleared as a whole.
-        if(decl.parent is Block)
-            return true
+        if(decl.parent is Block) {
+            // if the variable is declared in a block and is NOT in ZEROPAGE, we can omit the init with 0 because
+            // the variable will be initialized to zero when the BSS section is cleared as a whole.
+            if (decl.zeropage == ZeropageWish.NOT_IN_ZEROPAGE)
+                return true
+
+            // block level zp var that is not in zeropage, doesn't have to be cleared (will be done as part of bss clear at startup)
+            // note: subroutine level var HAS to be cleared because it needs to be zero at every subroutine call!
+            if (decl.zeropage == ZeropageWish.DONTCARE && options.zeropage == ZeropageType.DONTUSE)
+                return true
+        }
 
         // if there is an assignment to the variable below it (regular assign, or For loop),
         // and there is nothing important in between, we can skip the initialization.

compiler/test/TestBuiltinFunctions.kt

@@ -5,6 +5,7 @@ import io.kotest.engine.spec.tempdir
 import io.kotest.inspectors.shouldForAll
 import io.kotest.matchers.shouldBe
 import io.kotest.matchers.shouldNotBe
+import io.kotest.matchers.string.shouldContain
 import prog8.ast.expressions.NumericLiteral
 import prog8.ast.statements.Assignment
 import prog8.ast.statements.FunctionCallStatement
@@ -13,6 +14,7 @@ import prog8.code.core.BuiltinFunctions
 import prog8.code.core.RegisterOrPair
 import prog8.code.core.isNumeric
 import prog8.code.target.Cx16Target
+import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.compileText
 
 class TestBuiltinFunctions: FunSpec({
@@ -103,5 +105,31 @@ main {
 
         compileText(Cx16Target(), true, src, outputDir, writeAssembly = true) shouldNotBe null
     }
+
+    test("warning for return value discarding of pure functions") {
+        val src="""
+main {
+    sub start() {
+        word @shared ww = 2222
+
+        abs(ww)
+        sgn(ww)
+        sqrt(ww)
+        min(ww, 0)
+        max(ww, 0)
+        clamp(ww, 0, 319)
+    }
+}"""
+
+        val errors = ErrorReporterForTests(keepMessagesAfterReporting = true)
+        compileText(Cx16Target(), true, src, outputDir, errors=errors, writeAssembly = false) shouldNotBe null
+        errors.warnings.size shouldBe 6
+        errors.warnings[0] shouldContain "statement has no effect"
+        errors.warnings[1] shouldContain "statement has no effect"
+        errors.warnings[2] shouldContain "statement has no effect"
+        errors.warnings[3] shouldContain "statement has no effect"
+        errors.warnings[4] shouldContain "statement has no effect"
+        errors.warnings[5] shouldContain "statement has no effect"
+    }
 })
 

compiler/test/codegeneration/TestVariables.kt

@@ -10,7 +10,12 @@ import prog8.ast.statements.Assignment
 import prog8.ast.statements.AssignmentOrigin
 import prog8.ast.statements.ForLoop
 import prog8.ast.statements.VarDecl
+import prog8.code.ast.PtAssignment
+import prog8.code.ast.PtBool
+import prog8.code.ast.PtNumber
 import prog8.code.target.C64Target
+import prog8.code.target.Cx16Target
+import prog8.code.target.VMTarget
 import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.compileText
 
@@ -106,6 +111,7 @@ class TestVariables: FunSpec({
 
     test("global var init with array lookup should sometimes be const") {
         val src="""
+%zeropage dontuse            
 main {
 
     bool[] barray =  [true, false, true, false]
@@ -220,4 +226,98 @@ main {
         (st[5] as Assignment).target.identifier?.nameInSource shouldBe listOf("v1")
         (st[6] as Assignment).target.identifier?.nameInSource shouldBe listOf("v0")
     }
+
+    test("nondirty zp variables should be explicitly initialized to 0") {
+        val src="""
+main {
+    ubyte @shared @requirezp zpvar
+    bool @shared @requirezp zpbool
+    ubyte @shared @requirezp @dirty dirtyzpvar
+    bool @shared @requirezp @dirty dirtyzpbool
+
+    sub start() {
+        ubyte @shared @requirezp zpvar2
+        bool @shared @requirezp zpbool2
+        ubyte @shared @requirezp @dirty dirtyzpvar2
+        bool @shared @requirezp @dirty dirtyzpbool2
+    }
+}"""
+
+        val result = compileText(Cx16Target(), false, src, outputDir, writeAssembly = true)!!.codegenAst
+
+        val main = result!!.allBlocks().first { it.name=="p8b_main" }
+        main.children.size shouldBe 7
+        val zeroassignsglobal =  main.children.filterIsInstance<PtAssignment>()
+        zeroassignsglobal.size shouldBe 2
+        (zeroassignsglobal[0].value as PtNumber).number shouldBe 0.0
+        zeroassignsglobal[0].target.identifier!!.name shouldBe "p8b_main.p8v_zpvar"
+        (zeroassignsglobal[1].value as PtBool).value shouldBe false
+        zeroassignsglobal[1].target.identifier!!.name shouldBe "p8b_main.p8v_zpbool"
+
+        val st = result.entrypoint()!!.children
+        st.size shouldBe 7
+        val zeroassigns =  st.filterIsInstance<PtAssignment>()
+        zeroassigns.size shouldBe 2
+        (zeroassigns[0].value as PtNumber).number shouldBe 0.0
+        zeroassigns[0].target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_zpvar2"
+        (zeroassigns[1].value as PtBool).value shouldBe false
+        zeroassigns[1].target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_zpbool2"
+
+
+        compileText(VMTarget(), false, src, outputDir, writeAssembly = true) shouldNotBe null
+    }
+
+    test("nondirty non zp variables in block scope should not be explicitly initialized to 0 (bss clear takes care of it)") {
+        val src="""
+%zeropage dontuse
+
+main {
+    ubyte @shared v1
+    ubyte @shared @dirty dv1
+    sub start() {
+        ubyte @shared v2
+        ubyte @shared @dirty dv2
+    }
+}"""
+
+        val result = compileText(Cx16Target(), false, src, outputDir, writeAssembly = true)!!.codegenAst
+
+        // block level should not be intialized to 0 (will be done by BSS clear)
+        val main = result!!.allBlocks().first { it.name=="p8b_main" }
+        main.children.size shouldBe 3
+        main.children.any { it is PtAssignment } shouldBe false
+
+        // subroutine should be initialized to 0 because that needs to be done on every call to the subroutine
+        val st = result.entrypoint()!!.children
+        st.size shouldBe 4
+        val zeroassign =  st.single { it is PtAssignment } as PtAssignment
+        (zeroassign.value as PtNumber).number shouldBe 0.0
+        zeroassign.target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_v2"
+    }
+
+    test("nondirty explicit non zp variables in block scope should not be explicitly initialized to 0 (bss clear takes care of it)") {
+        val src="""
+main {
+    ubyte @shared @nozp v1
+    ubyte @shared @dirty @nozp dv1
+    sub start() {
+        ubyte @shared @nozp v2
+        ubyte @shared @dirty @nozp dv2
+    }
+}"""
+
+        val result = compileText(Cx16Target(), false, src, outputDir, writeAssembly = true)!!.codegenAst
+
+        // block level should not be intialized to 0 (will be done by BSS clear)
+        val main = result!!.allBlocks().first { it.name=="p8b_main" }
+        main.children.size shouldBe 3
+        main.children.any { it is PtAssignment } shouldBe false
+
+        // subroutine should be initialized to 0 because that needs to be done on every call to the subroutine
+        val st = result.entrypoint()!!.children
+        st.size shouldBe 4
+        val zeroassign =  st.single { it is PtAssignment } as PtAssignment
+        (zeroassign.value as PtNumber).number shouldBe 0.0
+        zeroassign.target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_v2"
+    }
 })

docs/docs.iml

@@ -5,7 +5,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/build" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.12" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>

docs/source/_static/symboldumps/skeletons-c128.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-c128.p8

docs/source/_static/symboldumps/skeletons-c64.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-c64.p8

docs/source/_static/symboldumps/skeletons-cx16.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-cx16.p8
@@ -262,6 +263,7 @@ emudbg  {
     &ubyte  EMU_RECORD_WAV 
     &ubyte  EMU_SAVE_ON_EXIT 
     console_chrout  (ubyte char) 
+    console_nl  () 
     console_value1  (ubyte value) 
     console_value2  (ubyte value) 
     console_write  (str isoString) 

docs/source/_static/symboldumps/skeletons-pet32.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-pet32.p8

docs/source/_static/symboldumps/skeletons-virtual.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-virtual.p8
@@ -129,7 +130,7 @@ diskio  {
     rename  (uword oldfileptr, uword newfileptr) 
     rmdir  (str name) 
     save  (uword filenameptr, uword start_address, uword savesize) -> bool 
-    save_raw  (uword filenameptr, uword startaddress, uword savesize) -> bool 
+    save_raw  (uword filenameptr, uword start_address, uword savesize) -> bool 
     status  () -> str 
     status_code  () -> ubyte 
 }

docs/source/libraries.rst

@@ -27,7 +27,7 @@ of these library modules automatically as required.
 
 .. note::
     Several algorithms and math routines in Prog8's assembly library files are adapted from
-    code publicly available on https://www.codebase64.org/
+    code publicly available on https://www.codebase64.net/
 
 
 .. _builtinfunctions:
@@ -488,7 +488,17 @@ emudbg  (cx16 only)
 X16Emu Emulator debug routines, for Cx16 only.
 Allows you to interface with the emulator's debug routines/registers.
 There's stuff like ``is_emulator`` to detect if running in the emulator,
-and ``console_write`` to write a (iso) string to the emulator's console (stdout) etc.
+and ``console_write`` to write a (iso) string to the emulator's console (stdout), etc.
+
+*EOL (end of line) character handling:*
+Writing ``iso:'\n'`` to the console doesn't produce a proper new line there, because prog8 encodes
+the newline to character 13 on the X16 (this is what the X16 uses to print a newline on the screen).
+You have to explicitly output a character 10 on the console to see a newline there. You can do that in several ways::
+
+    emudbg.console_nl()
+    emudbg.console_chrout(10)
+    emudbg.console_write(iso:"hello\x0a")
+
 
 Read the `emudbg source code <https://github.com/irmen/prog8/tree/master/compiler/res/prog8lib/cx16/emudbg.p8>`_
 to see what's in there.

docs/source/software.rst

@@ -65,6 +65,11 @@ Various things:
     and it does it at run time. In this demo a jump table is not only created in the library,
     but also in the main program and copied into the library for its use.
 
+`Additional custom compilation targets (such as VIC-20) <https://github.com/gillham/prog8targets>`_
+    Various custom targets for Prog8 that are not (yet?) part of the Prog8 examples themselves.
+    These additional compilation targets may be in varying state of completeness.
+    Perhaps most recognisable at the time of adding this link, are the various VIC-20 targets.
+
 
 .. image:: _static/curious.png
     :align: center

docs/source/todo.rst

@@ -1,6 +1,9 @@
 TODO
 ====
 
+Port benchmarks from https://thred.github.io/c-bench-64/  to prog8 and see how it stacks up.
+
+
 STRUCTS: are being developed in their own separate branch for now, called "structs".
 Idea is to make it feature complete in the IR/Virtual target, then merge it to master?, and then start building the 6502 code generation for it.
 
@@ -68,6 +71,7 @@ Libraries
 Optimizations
 -------------
 
+- Since fixing the missing zp-var initialization, programs grew in size again because STZ's reappered. Can we add more intelligent (and correct!) optimizations to remove those STZs that might be redundant again?
 - in Identifier: use typedarray of strings instead of listOf? Other places?
 - Compilation speed: try to join multiple modifications in 1 result in the AST processors instead of returning it straight away every time
 - Compare output of some Oscar64 samples to what prog8 does for the equivalent code (see https://github.com/drmortalwombat/OscarTutorials/tree/main and https://github.com/drmortalwombat/oscar64/tree/main/samples)

examples/test.p8

@@ -1,27 +1,13 @@
 main {
+    ubyte @shared @requirezp zpvar
+    bool @shared @requirezp zpbool
+    ubyte @shared @requirezp @dirty dirtyzpvar
+    bool @shared @requirezp @dirty dirtyzpbool
+
     sub start() {
-        uword uw = 9999
-        word sw = -2222
-        ubyte ub = 42
-        byte sb = -99
-        bool bb = true
-
-        cx16.r0 = uw
-        cx16.r0s = sw
-        cx16.r0L = ub
-        cx16.r0H = ub
-        cx16.r0sL = sb
-        cx16.r0sH = sb
-        cx16.r0bL = bb
-        cx16.r0bH = bb
-
-        uw = cx16.r0
-        sw = cx16.r0s
-        ub = cx16.r0L
-        ub = cx16.r0H
-        sb = cx16.r0sL
-        sb = cx16.r0sH
-        bb = cx16.r0bL
-        bb = cx16.r0bH
+        ubyte @shared @requirezp zpvar2
+        bool @shared @requirezp zpbool2
+        ubyte @shared @requirezp @dirty dirtyzpvar2
+        bool @shared @requirezp @dirty dirtyzpbool2
     }
 }

gradle.properties

@@ -3,4 +3,4 @@ org.gradle.console=rich
 org.gradle.parallel=true
 org.gradle.daemon=true
 kotlin.code.style=official
-version=11.4
+version=11.5-SNAPSHOT

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -86,8 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
-' "$PWD" ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -115,7 +114,7 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -206,7 +205,7 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
@@ -214,7 +213,7 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
         -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -70,11 +70,11 @@ goto fail
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

intermediate/src/prog8/intermediate/IRInstructions.kt

@@ -11,8 +11,10 @@ Intermediate Representation instructions for the IR Virtual machine.
 
 Specs of the virtual machine this will run on:
 Program to execute is not stored in the system memory, it's just a separate list of instructions.
-65536 virtual registers, 16 bits wide, can also be used as 8 bits. r0-r65535
-65536 virtual floating point registers (64 bits double precision)  fr0-fr65535
+100K virtual registers, 16 bits wide, can also be used as 8 bits. r0-r99999
+    reserved 99000 - 99099 : WORD registers for syscall arguments and response value(s)
+    reserved 99100 - 99199 : BYTE registers for syscall arguments and response value(s)
+100K virtual floating point registers (64 bits double precision)  fr0-fr99999
 65536 bytes of memory. Thus memory pointers (addresses) are limited to 16 bits.
 Value stack, max 128 entries of 1 byte each.
 Status flags: Carry, Zero, Negative.   NOTE: status flags are only affected by the CMP instruction or explicit CLC/SEC,

languageServer/build.gradle.kts

@@ -0,0 +1,103 @@
+plugins {
+    kotlin("jvm")
+    id("application")
+}
+
+val debugPort = 8000
+val debugArgs = "-agentlib:jdwp=transport=dt_socket,server=y,address=8000,suspend=n,quiet=y"
+
+val serverMainClassName = "prog8lsp.MainKt"
+val applicationName = "prog8-language-server"
+
+application {
+    mainClass.set(serverMainClassName)
+    description = "Code completions, diagnostics and more for Prog8"
+    // applicationDefaultJvmArgs = listOf("-DkotlinLanguageServer.version=$version")
+    applicationDistribution.into("bin") {
+        filePermissions {
+            user {
+                read=true
+                execute=true
+                write=true
+            }
+            other.execute = true
+            group.execute = true
+        }
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.eclipse.lsp4j:org.eclipse.lsp4j:0.24.0")
+    implementation("org.eclipse.lsp4j:org.eclipse.lsp4j.jsonrpc:0.24.0")
+}
+
+configurations.forEach { config ->
+    config.resolutionStrategy {
+        preferProjectModules()
+    }
+}
+
+sourceSets.main {
+    java.srcDir("src")
+    resources.srcDir("resources")
+}
+
+sourceSets.test {
+    java.srcDir("src")
+    resources.srcDir("resources")
+}
+
+tasks.startScripts {
+    applicationName = "prog8-language-server"
+}
+
+tasks.register<Exec>("fixFilePermissions") {
+    // When running on macOS or Linux the start script
+    // needs executable permissions to run.
+
+    onlyIf { !System.getProperty("os.name").lowercase().contains("windows") }
+    commandLine("chmod", "+x", "${tasks.installDist.get().destinationDir}/bin/prog8-language-server")
+}
+
+tasks.register<JavaExec>("debugRun") {
+    mainClass.set(serverMainClassName)
+    classpath(sourceSets.main.get().runtimeClasspath)
+    standardInput = System.`in`
+
+    jvmArgs(debugArgs)
+    doLast {
+        println("Using debug port $debugPort")
+    }
+}
+
+tasks.register<CreateStartScripts>("debugStartScripts") {
+    applicationName = "prog8-language-server"
+    mainClass.set(serverMainClassName)
+    outputDir = tasks.installDist.get().destinationDir.toPath().resolve("bin").toFile()
+    classpath = tasks.startScripts.get().classpath
+    defaultJvmOpts = listOf(debugArgs)
+}
+
+tasks.register<Sync>("installDebugDist") {
+    dependsOn("installDist")
+    finalizedBy("debugStartScripts")
+}
+
+tasks.withType<Test>() {
+    testLogging {
+        events("failed")
+        exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
+    }
+}
+
+tasks.installDist {
+    finalizedBy("fixFilePermissions")
+}
+
+tasks.build {
+    finalizedBy("installDist")
+}

languageServer/languageServer.iml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="eclipse.lsp4j" level="project" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

languageServer/src/prog8lsp/AsyncExecutor.kt

@@ -0,0 +1,34 @@
+package prog8lsp
+
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+import java.util.function.Supplier
+
+private var threadCount = 0
+
+class AsyncExecutor {
+    private val workerThread = Executors.newSingleThreadExecutor { Thread(it, "async${threadCount++}") }
+
+    fun execute(task: () -> Unit) =
+        CompletableFuture.runAsync(Runnable(task), workerThread)
+
+    fun <R> compute(task: () -> R) =
+        CompletableFuture.supplyAsync(Supplier(task), workerThread)
+
+    fun <R> computeOr(defaultValue: R, task: () -> R?) =
+        CompletableFuture.supplyAsync(Supplier {
+            try {
+                task() ?: defaultValue
+            } catch (e: Exception) {
+                defaultValue
+            }
+        }, workerThread)
+
+    fun shutdown(awaitTermination: Boolean) {
+        workerThread.shutdown()
+        if (awaitTermination) {
+            workerThread.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS)
+        }
+    }
+}

languageServer/src/prog8lsp/Main.kt

@@ -0,0 +1,19 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.launch.LSPLauncher
+import java.util.concurrent.Executors
+import java.util.logging.Level
+import java.util.logging.Logger
+
+fun main(args: Array<String>) {
+    Logger.getLogger("").level = Level.INFO
+
+    val inStream = System.`in`
+    val outStream = System.out
+    val server = Prog8LanguageServer()
+    val threads = Executors.newSingleThreadExecutor { Thread(it, "client") }
+    val launcher = LSPLauncher.createServerLauncher(server, inStream, outStream, threads) { it }
+
+    server.connect(launcher.remoteProxy)
+    launcher.startListening()
+}

languageServer/src/prog8lsp/Prog8LanguageServer.kt

@@ -0,0 +1,46 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.InitializeParams
+import org.eclipse.lsp4j.InitializeResult
+import org.eclipse.lsp4j.services.*
+import java.io.Closeable
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.CompletableFuture.completedFuture
+import java.util.logging.Logger
+
+class Prog8LanguageServer: LanguageServer, LanguageClientAware, Closeable {
+    private lateinit var client: LanguageClient
+    private val textDocuments = Prog8TextDocumentService()
+    private val workspaces = Prog8WorkspaceService()
+    private val async = AsyncExecutor()
+    private val logger = Logger.getLogger(Prog8LanguageServer::class.simpleName)
+
+    override fun initialize(params: InitializeParams): CompletableFuture<InitializeResult> = async.compute {
+        logger.info("Initializing LanguageServer")
+
+        InitializeResult()
+    }
+
+    override fun shutdown(): CompletableFuture<Any> {
+        close()
+        return completedFuture(null)
+    }
+
+    override fun exit() { }
+
+    override fun getTextDocumentService(): TextDocumentService = textDocuments
+
+    override fun getWorkspaceService(): WorkspaceService = workspaces
+
+    override fun connect(client: LanguageClient) {
+        logger.info("connecting to language client")
+        this.client = client
+        workspaces.connect(client)
+        textDocuments.connect(client)
+    }
+
+    override fun close() {
+        logger.info("closing down")
+        async.shutdown(awaitTermination = true)
+    }
+}

languageServer/src/prog8lsp/Prog8TextDocumentService.kt

@@ -0,0 +1,62 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.*
+import org.eclipse.lsp4j.jsonrpc.messages.Either
+import org.eclipse.lsp4j.services.LanguageClient
+import org.eclipse.lsp4j.services.TextDocumentService
+import java.util.concurrent.CompletableFuture
+import java.util.logging.Logger
+import kotlin.system.measureTimeMillis
+
+class Prog8TextDocumentService: TextDocumentService {
+    private var client: LanguageClient? = null
+    private val async = AsyncExecutor()
+    private val logger = Logger.getLogger(Prog8TextDocumentService::class.simpleName)
+
+    fun connect(client: LanguageClient) {
+        this.client = client
+    }
+
+    override fun didOpen(params: DidOpenTextDocumentParams) {
+        logger.info("didOpen: $params")
+    }
+
+    override fun didChange(params: DidChangeTextDocumentParams) {
+        logger.info("didChange: $params")
+    }
+
+    override fun didClose(params: DidCloseTextDocumentParams) {
+        logger.info("didClose: $params")
+    }
+
+    override fun didSave(params: DidSaveTextDocumentParams) {
+        logger.info("didSave: $params")
+    }
+
+    override fun documentSymbol(params: DocumentSymbolParams): CompletableFuture<MutableList<Either<SymbolInformation, DocumentSymbol>>> = async.compute {
+        logger.info("Find symbols in ${params.textDocument.uri}")
+        val result: MutableList<Either<SymbolInformation, DocumentSymbol>>
+        val time = measureTimeMillis {
+            result = mutableListOf()
+            val range = Range(Position(1,1), Position(1,5))
+            val selectionRange = Range(Position(1,2), Position(1,10))
+            val symbol = DocumentSymbol("test-symbolName", SymbolKind.Constant, range, selectionRange)
+            result.add(Either.forRight(symbol))
+        }
+        logger.info("Finished in $time ms")
+        result
+    }
+
+    override fun completion(position: CompletionParams): CompletableFuture<Either<MutableList<CompletionItem>, CompletionList>>  = async.compute{
+        logger.info("Completion for ${position}")
+        val result: Either<MutableList<CompletionItem>, CompletionList>
+        val time = measureTimeMillis {
+            val list = CompletionList(false, listOf(CompletionItem("test-completionItem")))
+            result = Either.forRight(list)
+        }
+        logger.info("Finished in $time ms")
+        result
+    }
+
+    // TODO add all other methods that get called.... :P
+}

languageServer/src/prog8lsp/Prog8WorkspaceService.kt

@@ -0,0 +1,80 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.*
+import org.eclipse.lsp4j.jsonrpc.messages.Either
+import org.eclipse.lsp4j.services.LanguageClient
+import org.eclipse.lsp4j.services.WorkspaceService
+import java.util.concurrent.CompletableFuture
+import java.util.logging.Logger
+
+class Prog8WorkspaceService: WorkspaceService {
+    private var client: LanguageClient? = null
+    private val logger = Logger.getLogger(Prog8WorkspaceService::class.simpleName)
+
+    fun connect(client: LanguageClient) {
+        this.client = client
+    }
+
+    override fun executeCommand(params: ExecuteCommandParams): CompletableFuture<Any> {
+        logger.info("executeCommand $params")
+        return super.executeCommand(params)
+    }
+
+    override fun symbol(params: WorkspaceSymbolParams): CompletableFuture<Either<MutableList<out SymbolInformation>, MutableList<out WorkspaceSymbol>>> {
+        logger.info("symbol $params")
+        return super.symbol(params)
+    }
+
+    override fun resolveWorkspaceSymbol(workspaceSymbol: WorkspaceSymbol): CompletableFuture<WorkspaceSymbol> {
+        logger.info("resolveWorkspaceSymbol $workspaceSymbol")
+        return super.resolveWorkspaceSymbol(workspaceSymbol)
+    }
+
+    override fun didChangeConfiguration(params: DidChangeConfigurationParams) {
+        logger.info("didChangeConfiguration: $params")
+    }
+
+    override fun didChangeWatchedFiles(params: DidChangeWatchedFilesParams) {
+        logger.info("didChangeWatchedFiles: $params")
+    }
+
+    override fun didChangeWorkspaceFolders(params: DidChangeWorkspaceFoldersParams) {
+        logger.info("didChangeWorkspaceFolders $params")
+        super.didChangeWorkspaceFolders(params)
+    }
+
+    override fun willCreateFiles(params: CreateFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willCreateFiles $params")
+        return super.willCreateFiles(params)
+    }
+
+    override fun didCreateFiles(params: CreateFilesParams) {
+        logger.info("didCreateFiles $params")
+        super.didCreateFiles(params)
+    }
+
+    override fun willRenameFiles(params: RenameFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willRenameFiles $params")
+        return super.willRenameFiles(params)
+    }
+
+    override fun didRenameFiles(params: RenameFilesParams) {
+        logger.info("didRenameFiles $params")
+        super.didRenameFiles(params)
+    }
+
+    override fun willDeleteFiles(params: DeleteFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willDeleteFiles $params")
+        return super.willDeleteFiles(params)
+    }
+
+    override fun didDeleteFiles(params: DeleteFilesParams) {
+        logger.info("didDeleteFiles $params")
+        super.didDeleteFiles(params)
+    }
+
+    override fun diagnostic(params: WorkspaceDiagnosticParams): CompletableFuture<WorkspaceDiagnosticReport> {
+        logger.info("diagnostic $params")
+        return super.diagnostic(params)
+    }
+}

settings.gradle

@@ -10,5 +10,6 @@ include(
     ':codeGenCpu6502',
     ':codeGenExperimental',
     ':compiler',
-    ':beanshell'
+    ':beanshell',
+    ':languageServer'
 )

simpleAst/src/prog8/code/SymbolTable.kt

@@ -200,7 +200,7 @@ class StStaticVariable(name: String,
         // Certain codegens might want to put them back into the variable directly.
         // For strings and arrays this doesn't occur - these are always already specced at creation time.
 
-        require(number!=0.0) { "variable should not be initialized with 0, it will already be zeroed as part of BSS clear" }
+        require(number!=0.0 || zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) { "non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear" }
         initializationNumericValue = number
     }