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/*
* 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.ExpressionCodegen
import org.jetbrains.kotlin.codegen.StackValue
import org.jetbrains.kotlin.codegen.range.BoundedValue
import org.jetbrains.kotlin.codegen.range.comparison.ComparisonGenerator
import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.org.objectweb.asm.Label
class ForInSimpleProgressionLoopGenerator(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
private val startValue: StackValue,
private val isStartInclusive: Boolean,
private val endValue: StackValue,
private val isEndInclusive: Boolean,
private val inverseBoundsEvaluationOrder: Boolean,
comparisonGenerator: ComparisonGenerator,
step: Int
) : AbstractForInRangeLoopGenerator(codegen, forExpression, step, comparisonGenerator) {
constructor(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
boundedValue: BoundedValue,
inverseBoundsEvaluationOrder: Boolean,
comparisonGenerator: ComparisonGenerator,
step: Int
) : this(
codegen, forExpression,
startValue = if (step == 1) boundedValue.lowBound else boundedValue.highBound,
isStartInclusive = if (step == 1) boundedValue.isLowInclusive else boundedValue.isHighInclusive,
endValue = if (step == 1) boundedValue.highBound else boundedValue.lowBound,
isEndInclusive = if (step == 1) boundedValue.isHighInclusive else boundedValue.isLowInclusive,
inverseBoundsEvaluationOrder = inverseBoundsEvaluationOrder,
comparisonGenerator = comparisonGenerator,
step = step
)
companion object {
fun fromBoundedValueWithStep1(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
boundedValue: BoundedValue,
comparisonGenerator: ComparisonGenerator,
inverseBoundsEvaluationOrder: Boolean = false
) =
ForInSimpleProgressionLoopGenerator(codegen, forExpression, boundedValue, inverseBoundsEvaluationOrder, comparisonGenerator, 1)
fun fromBoundedValueWithStepMinus1(
codegen: ExpressionCodegen,
forExpression: KtForExpression,
boundedValue: BoundedValue,
comparisonGenerator: ComparisonGenerator,
inverseBoundsEvaluationOrder: Boolean = false
) =
ForInSimpleProgressionLoopGenerator(codegen, forExpression, boundedValue, inverseBoundsEvaluationOrder, comparisonGenerator, -1)
}
override fun storeRangeStartAndEnd() {
if (inverseBoundsEvaluationOrder) {
StackValue.local(endVar, asmElementType).store(endValue, v)
loopParameter().store(startValue, v)
} else {
loopParameter().store(startValue, v)
StackValue.local(endVar, asmElementType).store(endValue, v)
}
// Skip 1st element if start is not inclusive.
if (!isStartInclusive) incrementLoopVariable()
}
override fun checkEmptyLoop(loopExit: Label) {
// No check required if end is non-inclusive: loop is generated with pre-condition.
if (isEndInclusive) {
super.checkEmptyLoop(loopExit)
}
}
override fun checkPreCondition(loopExit: Label) {
// Generate pre-condition loop if end is not inclusive.
if (!isEndInclusive) {
loopParameter().put(asmElementType, elementType, v)
v.load(endVar, asmElementType)
if (step > 0)
comparisonGenerator.jumpIfGreaterOrEqual(v, loopExit)
else
comparisonGenerator.jumpIfLessOrEqual(v, loopExit)
}
}
override fun checkPostConditionAndIncrement(loopExit: Label) {
// Generate post-condition loop if end is inclusive.
// Otherwise, just increment the loop variable.
if (isEndInclusive) {
super.checkPostConditionAndIncrement(loopExit)
} else {
incrementLoopVariable()
}
}
}