org.jetbrains.kotlin.codegen.range.forLoop.AbstractForInRangeLoopGenerator.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.
*/
package org.jetbrains.kotlin.codegen.range.forLoop
import org.jetbrains.kotlin.codegen.AsmUtil.genIncrement
import org.jetbrains.kotlin.codegen.ExpressionCodegen
import org.jetbrains.kotlin.codegen.StackValue
import org.jetbrains.kotlin.codegen.range.comparison.ComparisonGenerator
import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Type
abstract class AbstractForInRangeLoopGenerator(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
protected val step: Int,
protected val comparisonGenerator: ComparisonGenerator
) : AbstractForInProgressionOrRangeLoopGenerator(codegen, forExpression) {
override fun beforeLoop() {
super.beforeLoop()
storeRangeStartAndEnd()
}
protected abstract fun storeRangeStartAndEnd()
override fun checkEmptyLoop(loopExit: Label) {
loopParameter().put(asmElementType, elementType, v)
v.load(endVar, asmElementType)
if (step > 0) {
comparisonGenerator.jumpIfGreater(v, loopExit)
} else {
comparisonGenerator.jumpIfLess(v, loopExit)
}
}
override fun assignToLoopParameter() {}
override fun checkPostConditionAndIncrement(loopExit: Label) {
checkPostCondition(loopExit)
incrementLoopVariable()
}
protected fun incrementLoopVariable() {
if (loopParameterType === Type.INT_TYPE) {
v.iinc(loopParameterVar, step)
} else {
val loopParameter = loopParameter()
loopParameter.put(asmElementType, elementType, v)
genIncrement(asmElementType, step, v)
loopParameter.store(StackValue.onStack(asmElementType, elementType), v)
}
}
init {
assert(step == 1 || step == -1) { "'step' should be either 1 or -1: " + step }
}
}