Apple-2-SW/prog8
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fix compiler crash with adding too many typecasts to args. useless lsb() and msb() are optimized away.

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This commit is contained in:
Irmen de Jong 2020-09-09 21:37:56 +02:00
parent 02e29e6990
commit 40071b1431
3 changed files with 44 additions and 3 deletions
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1
compiler/src/prog8/ast/processing/TypecastsAdder.kt
View File

@ -139,6 +139,7 @@ class TypecastsAdder(val program: Program, val errors: ErrorReporter) : AstWalke
call.args[arg.second.index],
TypecastExpression(arg.second.value, possibleType, true, arg.second.value.position),
call as Node)
break
}
}
}

43
compiler/src/prog8/optimizer/ExpressionSimplifier.kt
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@ -297,6 +297,49 @@ internal class ExpressionSimplifier(private val program: Program) : AstWalker()
return noModifications
}
override fun after(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
if(functionCall.target.nameInSource == listOf("lsb")) {
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
return listOf(IAstModification.ReplaceNode(functionCall, arg.expression, parent))
}
} else {
val argDt = arg.inferType(program)
if (argDt.istype(DataType.BYTE) || argDt.istype(DataType.UBYTE)) {
// useless lsb() of byte value
return listOf(IAstModification.ReplaceNode(functionCall, arg, parent))
}
}
}
else if(functionCall.target.nameInSource == listOf("msb")) {
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
return listOf(IAstModification.ReplaceNode(
functionCall,
NumericLiteralValue(valueDt.typeOrElse(DataType.UBYTE), 0, arg.expression.position),
parent))
}
} else {
val argDt = arg.inferType(program)
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),
parent))
}
}
}
return noModifications
}
private fun determineY(x: Expression, subBinExpr: BinaryExpression): Expression? {
return when {
subBinExpr.left isSameAs x -> subBinExpr.right

3
examples/test.p8
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@ -11,9 +11,6 @@ main {
c64.CHROUT('*')
uword value = lsb(rnd() & 31) ; TODO fix compiler crash
;asmsub clear_screen (ubyte char @ A, ubyte color @ Y) clobbers(A) { ...}
; TODO dont cause name conflict if we define sub or sub with param 'color' or even a var 'color' later.