fix auto-insertion of AddressOf expression in function call arguments

compiler/src/prog8/ast/AstChecker.kt

@@ -334,6 +334,7 @@ private class AstChecker(private val namespace: INameScope,
                 err("a return register is also in the clobber list")
         } else {
             // TODO: non-asm subroutines can only take numeric arguments for now. (not strings and arrays)
+            // TODO: AddressOf: can this be improved now that we have '&' ?
             // the way string params are treated is almost okay (their address is passed) but the receiving subroutine treats it as an integer rather than referring back to the original string.
             // the way array params are treated is buggy; it thinks the subroutine needs a byte parameter in place of a byte[] ...
             // This is not easy to fix because strings and arrays are treated a bit simplistic (a "virtual" pointer to the value on the heap)

compiler/src/prog8/ast/StmtReorderer.kt

@@ -214,7 +214,7 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
     // Also takes care to insert AddressOf (&) expression where required (string params to a UWORD function param etc).
 
 
-    private val vardeclsToAdd = mutableMapOf<INameScope, MutableList<VarDecl>>()
+    private val vardeclsToAdd = mutableMapOf<INameScope, MutableMap<String, VarDecl>>()
 
     override fun process(module: Module) {
         super.process(module)
@@ -222,8 +222,8 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
         // add any new vardecls to the various scopes
         for(decl in vardeclsToAdd)
             for(d in decl.value) {
-                d.linkParents(decl.key as Node)
-                decl.key.statements.add(0, d)
+                d.value.linkParents(decl.key as Node)
+                decl.key.statements.add(0, d.value)
             }
     }
 
@@ -234,9 +234,7 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
 
         if(decl.datatype in NumericDatatypes) {
             val scope = decl.definingScope()
-            if(scope !in vardeclsToAdd)
-                vardeclsToAdd[scope] = mutableListOf()
-            vardeclsToAdd.getValue(scope).add(decl.asDefaultValueDecl(null))
+            addVarDecl(scope, decl.asDefaultValueDecl(null))
             val declvalue = decl.value!!
             val value =
                     if(declvalue is LiteralValue) {
@@ -269,7 +267,6 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
         return functionCallStatement
     }
 
-    // TODO move this to StatementReorderer instead?
     private fun addAddressOfExprIfNeeded(subroutine: Subroutine, arglist: MutableList<IExpression>, parent: Node) {
         // functions that accept UWORD and are given an array type, or string, will receive the AddressOf (memory location) of that value instead.
         for(argparam in subroutine.parameters.withIndex().zip(arglist)) {
@@ -288,13 +285,15 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
                 }
                 else if(strvalue!=null) {
                     if(strvalue.isString) {
-                        println("WANTING TO INSERT  &  for $strvalue") // TODO
-                        // TODO why does this result later in "pointer-of operand must be the name of a heap variable"
-                        //    --> because the AstChecker runs before AstIdentifiersChecker which inserts the actual VarDecl?
-                        val autoHeapvarRef = IdentifierReference(listOf("$autoHeapValuePrefix${strvalue.heapId}"), strvalue.position)
+                        // replace the argument with &autovar
+                        val autoVarName = "$autoHeapValuePrefix${strvalue.heapId}"
+                        val autoHeapvarRef = IdentifierReference(listOf(autoVarName), strvalue.position)
                         val pointerExpr = AddressOf(autoHeapvarRef, strvalue.position)
                         pointerExpr.linkParents(arglist[argparam.first.index].parent)
                         arglist[argparam.first.index] = pointerExpr
+                        // add a vardecl so that the autovar can be resolved in later lookups
+                        val variable = VarDecl(VarDeclType.VAR, strvalue.type, false, null, autoVarName, strvalue, strvalue.position)
+                        addVarDecl(strvalue.definingScope(), variable)
                     }
                 }
                 else throw FatalAstException("expected either an identifier or a literal as argument to $subroutine")
@@ -302,4 +301,10 @@ private class VarInitValueAndAddressOfCreator(private val namespace: INameScope)
         }
     }
 
+    private fun addVarDecl(scope: INameScope, variable: VarDecl) {
+        if(scope !in vardeclsToAdd)
+            vardeclsToAdd[scope] = mutableMapOf()
+        vardeclsToAdd.getValue(scope)[variable.name]=variable
+    }
+
 }

compiler/src/prog8/optimizing/ConstantFolding.kt

@@ -553,7 +553,7 @@ class ConstantFolding(private val namespace: INameScope, private val heap: HeapV
         } else if(array.any {it is AddressOf}) {
             val arrayDt = DataType.UWORD
             val intArrayWithAddressOfs = mutableListOf<IntegerOrAddressOf>()
-            // TODO FILL THIS ARRAY
+            // TODO AddressOf: FILL THIS ARRAY
             val heapId = heap.addIntegerArray(DataType.UWORD, intArrayWithAddressOfs.toTypedArray())
             return LiteralValue(arrayDt, heapId = heapId, position = arraylit.position)
         } else {

compiler/src/prog8/optimizing/StatementOptimizer.kt

@@ -17,7 +17,8 @@ import kotlin.math.floor
         todo remove unused subroutines
         todo remove unused strings and arrays from the heap
         todo inline subroutines that are called exactly once (regardless of their size)
-        todo inline subroutines that are only called a few times (3?) and that are "sufficiently small" (0-3 statements)
+        todo inline subroutines that are only called a few times (max 3?)
+        todo inline subroutines that are "sufficiently small" (0-3 statements)
 
     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)
 */

examples/test.p8

@@ -16,23 +16,25 @@
     str string2="bye"
 
     uword pointer = &array1
+    uword pointer2
+    uword pointer3
     byte bt
 
-    pointer = &array2
-    pointer = &string1
+    pointer2 = &array2
+    pointer3 = &string1
 
-    ;uword[4] pointers = [&array1, &array2, &string1, &string2]   ; @todo make it possible to initialize array with pointers
+    ; uword[4] pointers = [&array1, &array2, &string1, &string2]   ; @todo make it possible to initialize array with pointers
 
 
-    ;ptrsubasm("moet werken")         ; @todo rewrite ast into pointer-of expression (and remove special cases from Compiler)
-    ;pointersub("moet werken")        ; @todo rewrite ast into pointer-of expression (and remove special cases from Compiler)
-
+    ptrsubasm("moet werken")
+    pointersub("moet werken")
     myprintasm(string1)
     myprintasm(string2)
     myprintasm("moet werken3")
     myprintasm("moet werken3")
     myprintasm("moet werken4")
 
+    c64scr.print("this print must work\n")
     c64.CHROUT('\n')
 
     ptrsubasm(&array1)

parser/antlr/prog8.g4

@@ -109,7 +109,7 @@ varinitializer : vardecl '=' expression ;
 
 constdecl: 'const' varinitializer ;
 
-memoryvardecl: 'memory' varinitializer;
+memoryvardecl: 'memory' varinitializer;         // TODO replace 'memory' by '&'
 
 datatype:  'ubyte' | 'byte' | 'uword' | 'word' | 'float' | 'str' | 'str_s' ;