/*
* 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.kotlin.resolve.jvm.AsmTypes
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Type
class IteratorWithIndexForLoopGenerator(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
loopParameter: KtDestructuringDeclaration,
rangeCall: ResolvedCall<out CallableDescriptor>,
private val iteratorOwnerType: Type
) : AbstractWithIndexForLoopGenerator(codegen, forExpression, loopParameter, rangeCall) {
private var iteratorVar = -1
private var indexVar = -1
private var indexType = Type.INT_TYPE
private val asmTypeForIterator = Type.getType(Iterator::class.java)
override fun beforeLoop() {
indexVar = indexLoopComponent?.parameterVar ?: createLoopTempVariable(Type.INT_TYPE)
indexType = indexLoopComponent?.parameterType ?: Type.INT_TYPE
StackValue.local(indexVar, indexType).store(StackValue.constant(0), v)
iteratorVar = createLoopTempVariable(asmTypeForIterator)
codegen.generateCallReceiver(rangeCall).put(iteratorOwnerType, v)
v.invokeinterface(iteratorOwnerType.internalName, "iterator", "()Ljava/util/Iterator;")
StackValue.local(iteratorVar, asmTypeForIterator).store(StackValue.onStack(asmTypeForIterator), v)
}
override fun checkPreCondition(loopExit: Label) {
v.load(iteratorVar, asmTypeForIterator)
v.invokeinterface("java/util/Iterator", "hasNext", "()Z")
v.ifeq(loopExit)
}
override fun assignLoopParametersNextValues() {
v.load(iteratorVar, asmTypeForIterator)
v.invokeinterface("java/util/Iterator", "next", "()Ljava/lang/Object;")
if (elementLoopComponent != null) {
StackValue.local(elementLoopComponent.parameterVar, elementLoopComponent.parameterType)
.store(StackValue.onStack(AsmTypes.OBJECT_TYPE), v)
} else {
v.pop()
}
}
override fun incrementAndCheckPostCondition(loopExit: Label) {
v.iinc(indexVar, 1)
}
}