cleaned up some stuff, improved checking of asmsub statement body

compiler/src/prog8/ast/processing/AstIdentifiersChecker.kt

@@ -144,8 +144,7 @@ internal class AstIdentifiersChecker(private val program: Program) : IAstModifyi
             // NOTE:
             // - numeric types BYTE and WORD and FLOAT are passed by value;
             // - strings, arrays, matrices are passed by reference (their 16-bit address is passed as an uword parameter)
-            // - do NOT do this is the statement can be transformed into an asm subroutine later!
+            if(subroutine.asmAddress==null) {
-            if(subroutine.asmAddress==null && !subroutine.canBeAsmSubroutine) {
                 if(subroutine.asmParameterRegisters.isEmpty()) {
                     subroutine.parameters
                             .filter { it.name !in namesInSub }
@@ -157,6 +156,10 @@ internal class AstIdentifiersChecker(private val program: Program) : IAstModifyi
                             }
                 }
             }
+
+            if(subroutine.isAsmSubroutine && subroutine.statements.any{it !is InlineAssembly}) {
+                checkResult.add(SyntaxError("asmsub can only contain inline assembly (%asm)", subroutine.position))
+            }
         }
         return super.visit(subroutine)
     }

compiler/src/prog8/ast/processing/StatementReorderer.kt

@@ -1,10 +1,12 @@
 package prog8.ast.processing
 
-import prog8.ast.*
+import prog8.ast.Module
+import prog8.ast.Program
 import prog8.ast.base.DataType
 import prog8.ast.base.FatalAstException
 import prog8.ast.base.initvarsSubName
 import prog8.ast.expressions.*
+import prog8.ast.mangledStructMemberName
 import prog8.ast.statements.*
 
 

compiler/src/prog8/ast/processing/TypecastsAdder.kt

@@ -1,6 +1,8 @@
 package prog8.ast.processing
 
-import prog8.ast.*
+import prog8.ast.IFunctionCall
+import prog8.ast.INameScope
+import prog8.ast.Program
 import prog8.ast.base.DataType
 import prog8.ast.base.FatalAstException
 import prog8.ast.base.printWarning

compiler/src/prog8/ast/statements/AstStatements.kt

@@ -599,40 +599,6 @@ class Subroutine(override val name: String,
             .filter { it is InlineAssembly }
             .map { (it as InlineAssembly).assembly }
             .count { " rti" in it || "\trti" in it || " rts" in it || "\trts" in it || " jmp" in it || "\tjmp" in it }
-
-    val canBeAsmSubroutine =false // TODO disabled for now, see below about problem with converting to asm subroutine
-//            !isAsmSubroutine
-//                    && ((parameters.size == 1 && parameters[0].type in setOf(DataType.BYTE, DataType.UBYTE, DataType.WORD, DataType.UWORD))
-//                    || (parameters.size == 2 && parameters.map { it.type }.all { it == DataType.BYTE || it == DataType.UBYTE }))
-
-    fun intoAsmSubroutine(): Subroutine {
-        // TODO turn subroutine into asm calling convention.   Requires rethinking of how parameters are handled (conflicts with local vardefs now, see AstIdentifierChecker...)
-        return this // TODO
-
-//        println("TO ASM   $this")  // TODO
-//        val paramregs = if (parameters.size == 1 && parameters[0].type in setOf(DataType.BYTE, DataType.UBYTE))
-//            listOf(RegisterOrStatusflag(RegisterOrPair.Y, null, null))
-//        else if (parameters.size == 1 && parameters[0].type in setOf(DataType.WORD, DataType.UWORD))
-//            listOf(RegisterOrStatusflag(RegisterOrPair.AY, null, null))
-//        else if (parameters.size == 2 && parameters.map { it.type }.all { it == DataType.BYTE || it == DataType.UBYTE })
-//            listOf(RegisterOrStatusflag(RegisterOrPair.A, null, null), RegisterOrStatusflag(RegisterOrPair.Y, null, null))
-//        else throw FatalAstException("cannot convert subroutine to asm parameters")
-//
-//        val asmsub=Subroutine(
-//                name,
-//                parameters,
-//                returntypes,
-//                paramregs,
-//                emptyList(),
-//                emptySet(),
-//                null,
-//                true,
-//                statements,
-//                position
-//        )
-//        asmsub.linkParents(parent)
-//        return asmsub
-    }
 }
 
 open class SubroutineParameter(val name: String,

compiler/src/prog8/compiler/Main.kt

@@ -96,7 +96,7 @@ fun compileProgram(filepath: Path,
             programAst.checkValid(compilerOptions)          // check if final tree is valid
             programAst.checkRecursion()         // check if there are recursive subroutine calls
 
-            printAst(programAst)
+            // printAst(programAst)
 
             if(writeAssembly) {
                 // asm generation directly from the Ast, no need for intermediate code

compiler/src/prog8/optimizer/StatementOptimizer.kt

@@ -16,9 +16,7 @@ import kotlin.math.floor
 
 
 /*
-    todo: subroutines with 1 or 2 byte args or 1 word arg can be converted to asm sub calling convention (args in registers)
+    TODO: analyse for unreachable code and remove that (f.i. code after goto or return that has no label so can never be jumped to) + print warning about this
-    todo analyse for unreachable code and remove that (f.i. code after goto or return that has no label so can never be jumped to) + print warning about this
-
     TODO: proper inlining of small subroutines (correctly renaming/relocating all variables in them and refs to those as well, or restrict to subs without variables?)
 */
 
@@ -108,11 +106,6 @@ internal class StatementOptimizer(private val program: Program) : IAstModifyingV
             linesToRemove.reversed().forEach{subroutine.statements.removeAt(it)}
         }
 
-        if(subroutine.canBeAsmSubroutine) {
-            optimizationsDone++
-            return subroutine.intoAsmSubroutine()   // TODO this doesn't work yet due to parameter vardecl issue
-        }
-
         if(subroutine !in callgraph.usedSymbols && !forceOutput) {
             printWarning("removing unused subroutine '${subroutine.name}'", subroutine.position)
             optimizationsDone++

docs/source/todo.rst

@@ -19,17 +19,6 @@ these should call optimized pieces of assembly code, so they run as fast as poss
 
 For now, we have the ``memcopy``, ``memset`` and ``strlen`` builtin functions.
 
-Fixes
-^^^^^
-
-fix asmsub parameters so this works::
-
-      asmsub aa(byte arg @ Y) -> clobbers() -> () {
-          byte local = arg      ; @todo fix 'undefined symbol arg' that occurs here
-          A=44
-      }
-
-
 More optimizations
 ^^^^^^^^^^^^^^^^^^
 
@@ -38,11 +27,6 @@ Add more compiler optimizations to the existing ones.
 - on the language AST level
 - on the final assembly source level
 - can the parameter passing to subroutines be optimized to avoid copying?
-
-- subroutines with 1 or 2 byte args (or 1 word arg) should be converted to asm calling convention with the args in A/Y register
-  this requires rethinking the way parameters are represented, simply injecting vardecls to
-  declare local variables for them is not always correct anymore
-
 - working subroutine inlining (taking care of vars and identifier refs to them)
 
 Also some library routines and code patterns could perhaps be optimized further

examples/test.p8

@@ -27,4 +27,12 @@ main {
 ;        uw *= 2
 ;        ub *= 2
     }
+
+
+          asmsub aa(byte arg @ Y) clobbers() {
+            %asm {{
+            rts
+            }}
+          }
+
 }