/*
* Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
* that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.codegen.range.forLoop
import org.jetbrains.kotlin.codegen.ExpressionCodegen
import org.jetbrains.kotlin.codegen.StackValue
import org.jetbrains.kotlin.codegen.generateCallReceiver
import org.jetbrains.kotlin.descriptors.CallableDescriptor
import org.jetbrains.kotlin.psi.KtDestructuringDeclaration
import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Type
class CharSequenceWithIndexForLoopGenerator(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
loopParameter: KtDestructuringDeclaration,
rangeCall: ResolvedCall<out CallableDescriptor>,
private val canCacheLength: Boolean
) : AbstractWithIndexForLoopGenerator(codegen, forExpression, loopParameter, rangeCall) {
private val charSeqType = codegen.asmType(ExpressionCodegen.getExpectedReceiverType(rangeCall))
private var charSeqVar = -1
private var lengthVar = -1
private var indexVar = -1
private var indexType = Type.INT_TYPE
override fun beforeLoop() {
charSeqVar = createLoopTempVariable(charSeqType)
val charSeqValue = StackValue.local(charSeqVar, charSeqType)
charSeqValue.store(codegen.generateCallReceiver(rangeCall), v)
if (canCacheLength) {
lengthVar = createLoopTempVariable(Type.INT_TYPE)
evalCharSeqLengthOnStack()
v.store(lengthVar, Type.INT_TYPE)
}
indexVar = indexLoopComponent?.parameterVar ?: createLoopTempVariable(Type.INT_TYPE)
indexType = indexLoopComponent?.parameterType ?: Type.INT_TYPE
StackValue.local(indexVar, indexType).store(StackValue.constant(0), v)
}
private fun evalCharSeqLengthOnStack() {
v.load(charSeqVar, charSeqType)
v.invokeinterface("java/lang/CharSequence", "length", "()I")
}
override fun checkPreCondition(loopExit: Label) {
v.load(indexVar, Type.INT_TYPE)
if (canCacheLength) {
v.load(lengthVar, Type.INT_TYPE)
} else {
evalCharSeqLengthOnStack()
}
v.ificmpge(loopExit)
}
override fun assignLoopParametersNextValues() {
if (elementLoopComponent != null) {
v.load(charSeqVar, charSeqType)
v.load(indexVar, Type.INT_TYPE)
v.invokeinterface("java/lang/CharSequence", "charAt", "(I)C")
StackValue.local(elementLoopComponent.parameterVar, elementLoopComponent.parameterType)
.store(StackValue.onStack(Type.CHAR_TYPE), v)
}
}
override fun incrementAndCheckPostCondition(loopExit: Label) {
v.iinc(indexVar, 1)
}
}