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@initonce variable tag to skip variable reinitialization

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Irmen de Jong
2024-10-22 01:08:21 +02:00
parent 688dce6145
commit f89f1a84d0
15 changed files with 135 additions and 50 deletions
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codeOptimizers/src/prog8/optimizer/ConstantIdentifierReplacer.kt
+18 -3
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@@ -76,7 +76,7 @@ class VarConstantValueTypeAdjuster(
if (declValue != null) {
// variable is never written to, so it can be replaced with a constant, IF the value is a constant
errors.info("variable '${decl.name}' is never written to and was replaced by a constant", decl.position)
val const = VarDecl(VarDeclType.CONST, decl.origin, decl.datatype, decl.zeropage, decl.arraysize, decl.name, decl.names, declValue, decl.sharedWithAsm, decl.splitArray, decl.alignment, decl.position)
val const = VarDecl(VarDeclType.CONST, decl.origin, decl.datatype, decl.zeropage, decl.arraysize, decl.name, decl.names, declValue, decl.sharedWithAsm, decl.splitArray, decl.alignment, decl.initOnce, decl.position)
decl.value = null
return listOf(
IAstModification.ReplaceNode(decl, const, parent)
@@ -96,7 +96,7 @@ class VarConstantValueTypeAdjuster(
}
// variable only has a single write and it is the initialization value, so it can be replaced with a constant, IF the value is a constant
errors.info("variable '${decl.name}' is never written to and was replaced by a constant", decl.position)
val const = VarDecl(VarDeclType.CONST, decl.origin, decl.datatype, decl.zeropage, decl.arraysize, decl.name, decl.names, singleAssignment.value, decl.sharedWithAsm, decl.splitArray, decl.alignment, decl.position)
val const = VarDecl(VarDeclType.CONST, decl.origin, decl.datatype, decl.zeropage, decl.arraysize, decl.name, decl.names, singleAssignment.value, decl.sharedWithAsm, decl.splitArray, decl.alignment, decl.initOnce, decl.position)
return listOf(
IAstModification.ReplaceNode(decl, const, parent),
IAstModification.Remove(singleAssignment, singleAssignment.parent as IStatementContainer)
@@ -398,7 +398,7 @@ internal class ConstantIdentifierReplacer(
if(targetDatatype.isArray) {
val decl = VarDecl(VarDeclType.VAR, VarDeclOrigin.ARRAYLITERAL, targetDatatype.getOr(DataType.UNDEFINED),
ZeropageWish.DONTCARE, null, "dummy", emptyList(),
assignment.value, false, false, 0u, Position.DUMMY)
assignment.value, false, false, 0u, false, Position.DUMMY)
val replaceValue = createConstArrayInitializerValue(decl)
if(replaceValue!=null) {
return listOf(IAstModification.ReplaceNode(assignment.value, replaceValue, assignment))
@@ -419,6 +419,21 @@ internal class ConstantIdentifierReplacer(
return null
}
if (decl.isArray && decl.initOnce) {
if (decl.value == null) {
// initonce array without initialization value, make an array of just zeros
val size = decl.arraysize?.constIndex()
if(size!=null) {
val zeros = Array<Expression>(size) { decl.zeroElementValue() }
val initvalue = ArrayLiteral(InferredTypes.InferredType.known(decl.datatype), zeros, decl.position)
decl.value = initvalue
initvalue.linkParents(decl)
}
} else {
errors.err("arrays with an initialization value already are initialized only once by default", decl.position)
}
}
val rangeExpr = decl.value as? RangeExpression ?: return null
// convert the initializer range expression from a range, to an actual array literal.