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don't split expressions referencing the target variable wrongly

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This commit is contained in:
Irmen de Jong 2020-09-30 01:11:33 +02:00
parent 8d67056f84
commit 3cd32778bb
5 changed files with 41 additions and 44 deletions
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28
compiler/src/prog8/ast/expressions/AstExpressions.kt
View File

@ -23,7 +23,7 @@ sealed class Expression: Node {
abstract fun constValue(program: Program): NumericLiteralValue?
abstract fun accept(visitor: IAstVisitor)
abstract fun accept(visitor: AstWalker, parent: Node)
abstract fun referencesIdentifiers(vararg name: String): Boolean
abstract fun referencesIdentifier(vararg scopedName: String): Boolean
abstract fun inferType(program: Program): InferredTypes.InferredType
infix fun isSameAs(assigntarget: AssignTarget) = assigntarget.isSameAs(this)
@ -85,7 +85,7 @@ class PrefixExpression(val operator: String, var expression: Expression, overrid
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String) = expression.referencesIdentifiers(*name)
override fun referencesIdentifier(vararg scopedName: String) = expression.referencesIdentifier(*scopedName)
override fun inferType(program: Program): InferredTypes.InferredType {
val inferred = expression.inferType(program)
return when(operator) {
@ -142,7 +142,7 @@ class BinaryExpression(var left: Expression, var operator: String, var right: Ex
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String) = left.referencesIdentifiers(*name) || right.referencesIdentifiers(*name)
override fun referencesIdentifier(vararg scopedName: String) = left.referencesIdentifier(*scopedName) || right.referencesIdentifier(*scopedName)
override fun inferType(program: Program): InferredTypes.InferredType {
val leftDt = left.inferType(program)
val rightDt = right.inferType(program)
@ -255,7 +255,7 @@ class ArrayIndexedExpression(var identifier: IdentifierReference,
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String) = identifier.referencesIdentifiers(*name)
override fun referencesIdentifier(vararg scopedName: String) = identifier.referencesIdentifier(*scopedName)
override fun inferType(program: Program): InferredTypes.InferredType {
val target = identifier.targetStatement(program.namespace)
@ -291,7 +291,7 @@ class TypecastExpression(var expression: Expression, var type: DataType, val imp
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String) = expression.referencesIdentifiers(*name)
override fun referencesIdentifier(vararg scopedName: String) = expression.referencesIdentifier(*scopedName)
override fun inferType(program: Program): InferredTypes.InferredType = InferredTypes.knownFor(type)
override fun constValue(program: Program): NumericLiteralValue? {
val cv = expression.constValue(program) ?: return null
@ -322,7 +322,7 @@ data class AddressOf(var identifier: IdentifierReference, override val position:
}
override fun constValue(program: Program): NumericLiteralValue? = null
override fun referencesIdentifiers(vararg name: String) = false
override fun referencesIdentifier(vararg scopedName: String) = false
override fun inferType(program: Program): InferredTypes.InferredType = InferredTypes.knownFor(DataType.UWORD)
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
@ -345,7 +345,7 @@ class DirectMemoryRead(var addressExpression: Expression, override val position:
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String) = false
override fun referencesIdentifier(vararg scopedName: String) = false
override fun inferType(program: Program): InferredTypes.InferredType = InferredTypes.knownFor(DataType.UBYTE)
override fun constValue(program: Program): NumericLiteralValue? = null
@ -398,7 +398,7 @@ class NumericLiteralValue(val type: DataType, // only numerical types allowed
throw FatalAstException("can't replace here")
}
override fun referencesIdentifiers(vararg name: String) = false
override fun referencesIdentifier(vararg scopedName: String) = false
override fun constValue(program: Program) = this
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
@ -498,7 +498,7 @@ class StringLiteralValue(val value: String,
throw FatalAstException("can't replace here")
}
override fun referencesIdentifiers(vararg name: String) = false
override fun referencesIdentifier(vararg scopedName: String) = false
override fun constValue(program: Program): NumericLiteralValue? = null
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
@ -533,7 +533,7 @@ class ArrayLiteralValue(val type: InferredTypes.InferredType, // inferred be
replacement.parent = this
}
override fun referencesIdentifiers(vararg name: String) = value.any { it.referencesIdentifiers(*name) }
override fun referencesIdentifier(vararg scopedName: String) = value.any { it.referencesIdentifier(*scopedName) }
override fun constValue(program: Program): NumericLiteralValue? = null
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
@ -638,7 +638,7 @@ class RangeExpr(var from: Expression,
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String): Boolean = from.referencesIdentifiers(*name) || to.referencesIdentifiers(*name)
override fun referencesIdentifier(vararg scopedName: String): Boolean = from.referencesIdentifier(*scopedName) || to.referencesIdentifier(*scopedName)
override fun inferType(program: Program): InferredTypes.InferredType {
val fromDt=from.inferType(program)
val toDt=to.inferType(program)
@ -751,8 +751,8 @@ data class IdentifierReference(val nameInSource: List<String>, override val posi
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String): Boolean =
nameInSource.size==name.size && nameInSource.toTypedArray().contentEquals(name)
override fun referencesIdentifier(vararg scopedName: String): Boolean =
nameInSource.size==scopedName.size && nameInSource.toTypedArray().contentEquals(scopedName)
override fun inferType(program: Program): InferredTypes.InferredType {
return when (val targetStmt = targetStatement(program.namespace)) {
@ -840,7 +840,7 @@ class FunctionCall(override var target: IdentifierReference,
override fun accept(visitor: IAstVisitor) = visitor.visit(this)
override fun accept(visitor: AstWalker, parent: Node)= visitor.visit(this, parent)
override fun referencesIdentifiers(vararg name: String): Boolean = target.referencesIdentifiers(*name) || args.any{it.referencesIdentifiers(*name)}
override fun referencesIdentifier(vararg scopedName: String): Boolean = target.referencesIdentifier(*scopedName) || args.any{it.referencesIdentifier(*scopedName)}
override fun inferType(program: Program): InferredTypes.InferredType {
val constVal = constValue(program ,false)

2
compiler/src/prog8/ast/processing/AstChecker.kt
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@ -476,7 +476,7 @@ internal class AstChecker(private val program: Program,
fun err(msg: String, position: Position?=null) = errors.err(msg, position ?: decl.position)
// the initializer value can't refer to the variable itself (recursive definition)
if(decl.value?.referencesIdentifiers(decl.name) == true || decl.arraysize?.index?.referencesIdentifiers(decl.name) == true)
if(decl.value?.referencesIdentifier(decl.name) == true || decl.arraysize?.index?.referencesIdentifier(decl.name) == true)
err("recursive var declaration")
// CONST can only occur on simple types (byte, word, float)

27
compiler/src/prog8/compiler/BeforeAsmGenerationAstChanger.kt
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@ -26,16 +26,31 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: E
override fun after(assignment: Assignment, parent: Node): Iterable<IAstModification> {
// Try to replace A = B <operator> Something by A= B, A = A <operator> Something
// this triggers the more efficent augmented assignment code generation more often.
// But it can only be done if the target variable IS NOT OCCURRING AS AN OPERAND ITSELF.
if(!assignment.isAugmentable
&& assignment.target.identifier != null
&& assignment.target.isNotMemory(program.namespace)) {
val binExpr = assignment.value as? BinaryExpression
if(binExpr!=null && binExpr.operator !in comparisonOperators) {
if(binExpr.left !is BinaryExpression) {
val assignLeft = Assignment(assignment.target, binExpr.left, assignment.position)
return listOf(
IAstModification.InsertBefore(assignment, assignLeft, parent),
IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
if (binExpr != null && binExpr.operator !in comparisonOperators) {
if (binExpr.left !is BinaryExpression) {
if (binExpr.right.referencesIdentifier(*assignment.target.identifier!!.nameInSource.toTypedArray())) {
// the right part of the expression contains the target variable itself.
// we can't 'split' it trivially because the variable will be changed halfway through.
if(binExpr.operator in associativeOperators) {
// A = <something-without-A> <associativeoperator> <otherthing-with-A>
// use the other part of the expression to split.
val assignRight = Assignment(assignment.target, binExpr.right, assignment.position)
return listOf(
IAstModification.InsertBefore(assignment, assignRight, parent),
IAstModification.ReplaceNode(binExpr.right, binExpr.left, binExpr),
IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
}
} else {
val assignLeft = Assignment(assignment.target, binExpr.left, assignment.position)
return listOf(
IAstModification.InsertBefore(assignment, assignLeft, parent),
IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
}
}
}
}

2
compiler/src/prog8/optimizer/ConstantIdentifierReplacer.kt
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@ -58,7 +58,7 @@ internal class ConstantIdentifierReplacer(private val program: Program, private
override fun before(decl: VarDecl, parent: Node): Iterable<IAstModification> {
// the initializer value can't refer to the variable itself (recursive definition)
// TODO: use call graph for this?
if(decl.value?.referencesIdentifiers(decl.name) == true || decl.arraysize?.index?.referencesIdentifiers(decl.name) == true) {
if(decl.value?.referencesIdentifier(decl.name) == true || decl.arraysize?.index?.referencesIdentifier(decl.name) == true) {
errors.err("recursive var declaration", decl.position)
return noModifications
}

26
examples/test.p8
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@ -37,31 +37,13 @@ _saveX .byte 0
sub start() {
; byte bb = 100
; word ww = 30000
float ff1 = 12345
float ff2 = -99999
float ff1 = 1000
float ff2 = -1000
;ff = 1+((-ff) *3) ; TODO fix invalid splitting (can't split because it references ff itself)
;ff = 1+((-ff2) *3) ; TODO splitting should be okay here
testX()
floats.print_f(ff1) ; TODO if we remove this, the following calcuation is wrong
testX()
txt.chrout('\n')
testX()
ff1 = -ff2 * 3
testX()
ff1 = 1+((-ff1) *3) ; TODO why is splitting undone when OPTIMIZATION is ON?
floats.print_f(ff1)
testX()
txt.chrout('\n')
testX()
ff1 = -ff1 * 3
testX()
floats.print_f(ff1)
testX()
txt.chrout('\n')
ff1 = abs(ff2)
ff1 = 1+((-ff2) *3) ; TODO why is splitting undone when OPTIMIZATION is ON?
floats.print_f(ff1)
txt.chrout('\n')
testX()