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fixed wrong return value when calling other subroutines in the return expression

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This commit is contained in:
Irmen de Jong 2021-04-01 21:56:24 +02:00
parent 2ff04d2abd
commit 1fe4439395
1 changed files with 17 additions and 13 deletions
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30
compiler/src/prog8/optimizer/StatementOptimizer.kt
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@ -15,6 +15,8 @@ import prog8.compiler.target.ICompilationTarget
import java.nio.file.Path
import kotlin.math.floor
private const val retvalName = "prog8_retval"
internal class StatementOptimizer(private val program: Program,
private val errors: IErrorReporter,
@ -25,6 +27,7 @@ internal class StatementOptimizer(private val program: Program,
private val noModifications = emptyList<IAstModification>()
private val callgraph = CallGraph(program, asmFileLoader)
private val subsThatNeedReturnVariable = mutableSetOf<Triple<INameScope, DataType, Position>>()
override fun after(block: Block, parent: Node): Iterable<IAstModification> {
if("force_output" !in block.options()) {
@ -43,6 +46,12 @@ internal class StatementOptimizer(private val program: Program,
}
override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
for(returnvar in subsThatNeedReturnVariable) {
val decl = VarDecl(VarDeclType.VAR, returnvar.second, ZeropageWish.DONTCARE, null, retvalName, null, null, false, true, returnvar.third)
returnvar.first.statements.add(0, decl)
}
subsThatNeedReturnVariable.clear()
val forceOutput = "force_output" in subroutine.definingBlock().options()
if(subroutine.asmAddress==null && !forceOutput) {
if(subroutine.containsNoCodeNorVars() && !subroutine.inline) {
@ -436,18 +445,13 @@ internal class StatementOptimizer(private val program: Program,
}
override fun after(returnStmt: Return, parent: Node): Iterable<IAstModification> {
fun returnViaIntermediary(value: Expression): Iterable<IAstModification>? {
val returnDt = returnStmt.definingSubroutine()!!.returntypes.single()
fun returnViaIntermediaryVar(value: Expression): Iterable<IAstModification>? {
val subr = returnStmt.definingSubroutine()!!
val returnDt = subr.returntypes.single()
if (returnDt in IntegerDatatypes) {
// first assign to intermediary, then return that register
val returnValueIntermediary =
when(returnDt) {
DataType.UBYTE -> IdentifierReference(listOf("prog8_lib", "retval_interm_ub"), returnStmt.position)
DataType.BYTE -> IdentifierReference(listOf("prog8_lib", "retval_interm_b"), returnStmt.position)
DataType.UWORD -> IdentifierReference(listOf("prog8_lib", "retval_interm_uw"), returnStmt.position)
DataType.WORD -> IdentifierReference(listOf("prog8_lib", "retval_interm_w"), returnStmt.position)
else -> throw FatalAstException("weird return dt")
}
// first assign to intermediary variable, then return that
subsThatNeedReturnVariable.add(Triple(subr, returnDt, returnStmt.position))
val returnValueIntermediary = IdentifierReference(listOf(retvalName), returnStmt.position)
val tgt = AssignTarget(returnValueIntermediary, null, null, returnStmt.position)
val assign = Assignment(tgt, value, returnStmt.position)
val returnReplacement = Return(returnValueIntermediary, returnStmt.position)
@ -461,12 +465,12 @@ internal class StatementOptimizer(private val program: Program,
when(returnStmt.value) {
is PrefixExpression -> {
val mod = returnViaIntermediary(returnStmt.value!!)
val mod = returnViaIntermediaryVar(returnStmt.value!!)
if(mod!=null)
return mod
}
is BinaryExpression -> {
val mod = returnViaIntermediary(returnStmt.value!!)
val mod = returnViaIntermediaryVar(returnStmt.value!!)
if(mod!=null)
return mod
}