org.jetbrains.kotlin.codegen.range.forLoop.ForInArrayLoopGenerator.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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package org.jetbrains.kotlin.codegen.range.forLoop
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.codegen.DescriptorAsmUtil
import org.jetbrains.kotlin.codegen.ExpressionCodegen
import org.jetbrains.kotlin.codegen.StackValue
import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.kotlin.resolve.jvm.AsmTypes.OBJECT_TYPE
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Type
class ForInArrayLoopGenerator(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
private val canCacheArrayLength: Boolean,
private val shouldAlwaysStoreArrayInNewVar: Boolean
) : AbstractForLoopGenerator(codegen, forExpression) {
private var indexVar: Int = 0
private var arrayVar: Int = 0
private var arrayLengthVar: Int = 0
private val loopRangeType: KotlinType = bindingContext.getType(forExpression.loopRange!!)!!
override fun beforeLoop() {
super.beforeLoop()
indexVar = createLoopTempVariable(Type.INT_TYPE)
val loopRange = forExpression.loopRange
val value = codegen.gen(loopRange)
val asmLoopRangeType = codegen.asmType(loopRangeType)
if (!shouldAlwaysStoreArrayInNewVar && value is StackValue.Local && value.type == asmLoopRangeType) {
arrayVar = value.index // no need to copy local variable into another variable
} else {
arrayVar = createLoopTempVariable(OBJECT_TYPE)
value.put(asmLoopRangeType, loopRangeType, v)
v.store(arrayVar, OBJECT_TYPE)
}
if (canCacheArrayLength) {
arrayLengthVar = createLoopTempVariable(Type.INT_TYPE)
v.load(arrayVar, OBJECT_TYPE)
v.arraylength()
v.store(arrayLengthVar, Type.INT_TYPE)
}
v.iconst(0)
v.store(indexVar, Type.INT_TYPE)
}
override fun checkEmptyLoop(loopExit: Label) {}
override fun checkPreCondition(loopExit: Label) {
v.load(indexVar, Type.INT_TYPE)
if (canCacheArrayLength) {
v.load(arrayLengthVar, Type.INT_TYPE)
} else {
v.load(arrayVar, OBJECT_TYPE)
v.arraylength()
}
v.ificmpge(loopExit)
}
override fun assignToLoopParameter() {
val arrayElParamType =
if (KotlinBuiltIns.isArray(loopRangeType)) DescriptorAsmUtil.boxType(asmElementType, elementType, codegen.state.typeMapper) else asmElementType
v.load(arrayVar, OBJECT_TYPE)
v.load(indexVar, Type.INT_TYPE)
v.aload(arrayElParamType)
StackValue.local(loopParameterVar, loopParameterType, loopParameterKotlinType)
.store(StackValue.onStack(arrayElParamType, elementType), v)
}
override fun checkPostConditionAndIncrement(loopExit: Label) {
v.iinc(indexVar, 1)
}
}