org.jetbrains.kotlin.codegen.forLoop.AbstractForInRangeLoopGenerator.kt Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of kotlin-compiler Show documentation
the Kotlin compiler
There is a newer version: 2.0.20-RC
/*
 * 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.forLoop

import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.org.objectweb.asm.Label
import org.jetbrains.org.objectweb.asm.Type

import org.jetbrains.kotlin.codegen.AsmUtil.genIncrement
import org.jetbrains.kotlin.codegen.ExpressionCodegen
import org.jetbrains.kotlin.codegen.StackValue

abstract class AbstractForInRangeLoopGenerator : AbstractForInProgressionOrRangeLoopGenerator {
    private val step: Int

    constructor(codegen: ExpressionCodegen, forExpression: KtForExpression, step: Int) : super(codegen, forExpression) {
        assert(step == 1 || step == -1) { "'step' should be either 1 or -1: " + step }
        this.step = step        
    }

    constructor(codegen: ExpressionCodegen, forExpression: KtForExpression) : this(codegen, forExpression, 1)

    override fun beforeLoop() {
        super.beforeLoop()

        storeRangeStartAndEnd()
    }

    protected abstract fun storeRangeStartAndEnd()

    override fun checkEmptyLoop(loopExit: Label) {
        loopParameter().put(asmElementType, v)
        v.load(endVar, asmElementType)
        if (asmElementType.sort == Type.LONG) {
            v.lcmp()
            if (step > 0) {
                v.ifgt(loopExit)
            }
            else {
                v.iflt(loopExit)
            }
        }
        else {
            if (step > 0) {
                v.ificmpgt(loopExit)
            }
            else {
                v.ificmplt(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, v)
            genIncrement(asmElementType, step, v)
            loopParameter.store(StackValue.onStack(asmElementType), v)
        }
    }
}