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/*
* Copyright 2010-2015 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.cfg.pseudocode
import com.google.common.collect.*
import com.intellij.util.containers.BidirectionalMap
import org.jetbrains.kotlin.cfg.Label
import org.jetbrains.kotlin.cfg.pseudocode.instructions.*
import org.jetbrains.kotlin.cfg.pseudocode.instructions.eval.MagicInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.eval.MagicKind
import org.jetbrains.kotlin.cfg.pseudocode.instructions.eval.MergeInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.jumps.AbstractJumpInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.jumps.ConditionalJumpInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.jumps.NondeterministicJumpInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.special.LocalFunctionDeclarationInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.special.SubroutineEnterInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.special.SubroutineExitInstruction
import org.jetbrains.kotlin.cfg.pseudocode.instructions.special.SubroutineSinkInstruction
import org.jetbrains.kotlin.cfg.pseudocodeTraverser.*
import org.jetbrains.kotlin.cfg.pseudocodeTraverser.TraverseInstructionResult
import org.jetbrains.kotlin.psi.KtElement
import java.util.*
import org.jetbrains.kotlin.cfg.pseudocodeTraverser.TraversalOrder.BACKWARD
import org.jetbrains.kotlin.cfg.pseudocodeTraverser.TraversalOrder.FORWARD
class PseudocodeImpl(override val correspondingElement: KtElement) : Pseudocode {
inner class PseudocodeLabel internal constructor(private val name: String, private val comment: String?) : Label {
var targetInstructionIndex: Int? = null
private set
override fun getName(): String {
return name
}
override fun toString(): String {
return if (comment == null) name else "$name [$comment]"
}
fun setTargetInstructionIndex(targetInstructionIndex: Int) {
this.targetInstructionIndex = targetInstructionIndex
}
fun resolveToInstruction(): Instruction {
val index = targetInstructionIndex
if (index == null || index >= mutableInstructionList.size) {
error("resolveToInstruction: incorrect index $index for label $name " +
"in subroutine ${correspondingElement.text} with instructions $mutableInstructionList")
}
return mutableInstructionList[index]
}
fun copy(newLabelIndex: Int): PseudocodeLabel {
return PseudocodeLabel("L" + newLabelIndex, "copy of $name, $comment")
}
val pseudocode: PseudocodeImpl
get() = this@PseudocodeImpl
}
private val mutableInstructionList = ArrayList()
override val instructions = ArrayList()
private val elementsToValues = BidirectionalMap()
private val valueUsages = Maps.newHashMap>()
private val mergedValues = Maps.newHashMap>()
private val sideEffectFree = Sets.newHashSet()
override var parent: Pseudocode? = null
private set
override val localDeclarations: Set by lazy {
getLocalDeclarations(this)
}
//todo getters
private val representativeInstructions = HashMap()
private val labels = ArrayList()
private var internalExitInstruction: SubroutineExitInstruction? = null
override val exitInstruction: SubroutineExitInstruction
get() = internalExitInstruction ?: throw AssertionError("Exit instruction is read before initialization")
private var internalSinkInstruction: SubroutineSinkInstruction? = null
override val sinkInstruction: SubroutineSinkInstruction
get() = internalSinkInstruction ?: throw AssertionError("Sink instruction is read before initialization")
private var internalErrorInstruction: SubroutineExitInstruction? = null
private val errorInstruction: SubroutineExitInstruction
get() = internalErrorInstruction ?: throw AssertionError("Error instruction is read before initialization")
private var postPrecessed = false
private fun getLocalDeclarations(pseudocode: Pseudocode): Set {
val localDeclarations = Sets.newLinkedHashSet()
for (instruction in (pseudocode as PseudocodeImpl).mutableInstructionList) {
if (instruction is LocalFunctionDeclarationInstruction) {
localDeclarations.add(instruction)
localDeclarations.addAll(getLocalDeclarations(instruction.body))
}
}
return localDeclarations
}
val rootPseudocode: Pseudocode
get() {
var parent = parent
while (parent != null) {
if (parent.parent == null) return parent
parent = parent.parent
}
return this
}
fun createLabel(name: String, comment: String?): PseudocodeLabel {
val label = PseudocodeLabel(name, comment)
labels.add(label)
return label
}
override val reversedInstructions: List
get() {
val traversedInstructions = Sets.newLinkedHashSet()
traverseFollowingInstructions(sinkInstruction, traversedInstructions, BACKWARD, null)
if (traversedInstructions.size < instructions.size) {
val simplyReversedInstructions = Lists.newArrayList(instructions)
Collections.reverse(simplyReversedInstructions)
for (instruction in simplyReversedInstructions) {
if (!traversedInstructions.contains(instruction)) {
traverseFollowingInstructions(instruction, traversedInstructions, BACKWARD, null)
}
}
}
return Lists.newArrayList(traversedInstructions)
}
override val instructionsIncludingDeadCode: List
get() = mutableInstructionList
//for tests only
fun getLabels(): List {
return labels
}
fun addExitInstruction(exitInstruction: SubroutineExitInstruction) {
addInstruction(exitInstruction)
assert(internalExitInstruction == null) {
"Repeated initialization of exit instruction: $internalExitInstruction --> $exitInstruction"
}
internalExitInstruction = exitInstruction
}
fun addSinkInstruction(sinkInstruction: SubroutineSinkInstruction) {
addInstruction(sinkInstruction)
assert(internalSinkInstruction == null) {
"Repeated initialization of sink instruction: $internalSinkInstruction --> $sinkInstruction"
}
internalSinkInstruction = sinkInstruction
}
fun addErrorInstruction(errorInstruction: SubroutineExitInstruction) {
addInstruction(errorInstruction)
assert(internalErrorInstruction == null) {
"Repeated initialization of error instruction: $internalErrorInstruction --> $errorInstruction"
}
internalErrorInstruction = errorInstruction
}
fun addInstruction(instruction: Instruction) {
mutableInstructionList.add(instruction)
instruction.owner = this
if (instruction is KtElementInstruction) {
representativeInstructions.put(instruction.element, instruction)
}
if (instruction is MergeInstruction) {
addMergedValues(instruction)
}
for (inputValue in instruction.inputValues) {
addValueUsage(inputValue, instruction)
for (mergedValue in getMergedValues(inputValue)) {
addValueUsage(mergedValue, instruction)
}
}
if (instruction.calcSideEffectFree()) {
sideEffectFree.add(instruction)
}
}
override val enterInstruction: SubroutineEnterInstruction
get() = mutableInstructionList[0] as SubroutineEnterInstruction
override fun getElementValue(element: KtElement?) = elementsToValues[element]
override fun getValueElements(value: PseudoValue?) = elementsToValues.getKeysByValue(value) ?: emptyList()
override fun getUsages(value: PseudoValue?) = valueUsages[value] ?: mutableListOf()
override fun isSideEffectFree(instruction: Instruction) = sideEffectFree.contains(instruction)
fun bindElementToValue(element: KtElement, value: PseudoValue) {
elementsToValues.put(element, value)
}
fun bindLabel(label: Label) {
(label as PseudocodeLabel).setTargetInstructionIndex(mutableInstructionList.size)
}
private fun getMergedValues(value: PseudoValue) = mergedValues[value] ?: emptySet()
private fun addMergedValues(instruction: MergeInstruction) {
val result = LinkedHashSet()
for (value in instruction.inputValues) {
result.addAll(getMergedValues(value))
result.add(value)
}
mergedValues.put(instruction.outputValue, result)
}
private fun addValueUsage(value: PseudoValue, usage: Instruction) {
if (usage is MergeInstruction) return
valueUsages.getOrPut(
value
) { Lists.newArrayList() }.add(usage)
}
fun postProcess() {
if (postPrecessed) return
postPrecessed = true
errorInstruction.sink = sinkInstruction
exitInstruction.sink = sinkInstruction
var index = 0
for (instruction in mutableInstructionList) {
//recursively invokes 'postProcess' for local declarations
processInstruction(instruction, index)
index++
}
if (parent != null) return
// Collecting reachable instructions should be done after processing all instructions
// (including instructions in local declarations) to avoid being in incomplete state.
collectAndCacheReachableInstructions()
for (localFunctionDeclarationInstruction in localDeclarations) {
(localFunctionDeclarationInstruction.body as PseudocodeImpl).collectAndCacheReachableInstructions()
}
}
private fun collectAndCacheReachableInstructions() {
val reachableInstructions = collectReachableInstructions()
for (instruction in mutableInstructionList) {
if (reachableInstructions.contains(instruction)) {
instructions.add(instruction)
}
}
markDeadInstructions()
}
private fun processInstruction(instruction: Instruction, currentPosition: Int) {
instruction.accept(object : InstructionVisitor() {
override fun visitInstructionWithNext(instruction: InstructionWithNext) {
instruction.next = getNextPosition(currentPosition)
}
override fun visitJump(instruction: AbstractJumpInstruction) {
instruction.resolvedTarget = getJumpTarget(instruction.targetLabel)
}
override fun visitNondeterministicJump(instruction: NondeterministicJumpInstruction) {
instruction.next = getNextPosition(currentPosition)
val targetLabels = instruction.targetLabels
for (targetLabel in targetLabels) {
instruction.setResolvedTarget(targetLabel, getJumpTarget(targetLabel))
}
}
override fun visitConditionalJump(instruction: ConditionalJumpInstruction) {
val nextInstruction = getNextPosition(currentPosition)
val jumpTarget = getJumpTarget(instruction.targetLabel)
if (instruction.onTrue) {
instruction.nextOnFalse = nextInstruction
instruction.nextOnTrue = jumpTarget
}
else {
instruction.nextOnFalse = jumpTarget
instruction.nextOnTrue = nextInstruction
}
visitJump(instruction)
}
override fun visitLocalFunctionDeclarationInstruction(instruction: LocalFunctionDeclarationInstruction) {
val body = instruction.body as PseudocodeImpl
body.parent = this@PseudocodeImpl
body.postProcess()
instruction.next = sinkInstruction
}
override fun visitSubroutineExit(instruction: SubroutineExitInstruction) {
// Nothing
}
override fun visitSubroutineSink(instruction: SubroutineSinkInstruction) {
// Nothing
}
override fun visitInstruction(instruction: Instruction) {
throw UnsupportedOperationException(instruction.toString())
}
})
}
private fun collectReachableInstructions(): Set {
val visited = Sets.newHashSet()
traverseFollowingInstructions(enterInstruction, visited, FORWARD
) { instruction ->
if (instruction is MagicInstruction && instruction.kind === MagicKind.EXHAUSTIVE_WHEN_ELSE) {
return@traverseFollowingInstructions TraverseInstructionResult.SKIP
}
TraverseInstructionResult.CONTINUE
}
if (!visited.contains(exitInstruction)) {
visited.add(exitInstruction)
}
if (!visited.contains(errorInstruction)) {
visited.add(errorInstruction)
}
if (!visited.contains(sinkInstruction)) {
visited.add(sinkInstruction)
}
return visited
}
private fun markDeadInstructions() {
val instructionSet = Sets.newHashSet(instructions)
for (instruction in mutableInstructionList) {
if (!instructionSet.contains(instruction)) {
(instruction as? InstructionImpl)?.markedAsDead = true
for (nextInstruction in instruction.nextInstructions) {
(nextInstruction as? InstructionImpl)?.previousInstructions?.remove(instruction)
}
}
}
}
private fun getJumpTarget(targetLabel: Label): Instruction {
return (targetLabel as PseudocodeLabel).resolveToInstruction()
}
private fun getNextPosition(currentPosition: Int): Instruction {
val targetPosition = currentPosition + 1
assert(targetPosition < mutableInstructionList.size) { currentPosition }
return mutableInstructionList[targetPosition]
}
override fun copy(): PseudocodeImpl {
val result = PseudocodeImpl(correspondingElement)
result.repeatWhole(this)
return result
}
private fun repeatWhole(originalPseudocode: PseudocodeImpl) {
repeatInternal(originalPseudocode, null, null, 0)
parent = originalPseudocode.parent
}
fun repeatPart(startLabel: Label, finishLabel: Label, labelCount: Int): Int {
return repeatInternal((startLabel as PseudocodeLabel).pseudocode, startLabel, finishLabel, labelCount)
}
private fun repeatInternal(
originalPseudocode: PseudocodeImpl,
startLabel: Label?, finishLabel: Label?,
labelCountArg: Int): Int {
var labelCount = labelCountArg
val startIndex = (if (startLabel != null) (startLabel as PseudocodeLabel).targetInstructionIndex else Integer.valueOf(0))!!
val finishIndex = (if (finishLabel != null)
(finishLabel as PseudocodeLabel).targetInstructionIndex
else
Integer.valueOf(originalPseudocode.mutableInstructionList.size))!!
val originalToCopy = Maps.newLinkedHashMap()
val originalLabelsForInstruction = HashMultimap.create()
for (label in originalPseudocode.labels) {
val index = label.targetInstructionIndex ?: continue
//label is not bounded yet
if (label === startLabel || label === finishLabel) continue
if (startIndex <= index && index <= finishIndex) {
originalToCopy.put(label, label.copy(labelCount++))
originalLabelsForInstruction.put(getJumpTarget(label), label)
}
}
for (label in originalToCopy.values) {
labels.add(label as PseudocodeLabel)
}
for (index in startIndex..finishIndex - 1) {
val originalInstruction = originalPseudocode.mutableInstructionList[index]
repeatLabelsBindingForInstruction(originalInstruction, originalToCopy, originalLabelsForInstruction)
val copy = copyInstruction(originalInstruction, originalToCopy)
addInstruction(copy)
if (originalInstruction === originalPseudocode.internalErrorInstruction && copy is SubroutineExitInstruction) {
internalErrorInstruction = copy
}
if (originalInstruction === originalPseudocode.internalExitInstruction && copy is SubroutineExitInstruction) {
internalExitInstruction = copy
}
if (originalInstruction === originalPseudocode.internalSinkInstruction && copy is SubroutineSinkInstruction) {
internalSinkInstruction = copy
}
}
if (finishIndex < mutableInstructionList.size) {
repeatLabelsBindingForInstruction(originalPseudocode.mutableInstructionList[finishIndex],
originalToCopy,
originalLabelsForInstruction)
}
return labelCount
}
private fun repeatLabelsBindingForInstruction(
originalInstruction: Instruction,
originalToCopy: Map,
originalLabelsForInstruction: Multimap) {
for (originalLabel in originalLabelsForInstruction.get(originalInstruction)) {
bindLabel(originalToCopy[originalLabel]!!)
}
}
private fun copyInstruction(instruction: Instruction, originalToCopy: Map): Instruction {
if (instruction is AbstractJumpInstruction) {
val originalTarget = instruction.targetLabel
if (originalToCopy.containsKey(originalTarget)) {
return instruction.copy(originalToCopy[originalTarget]!!)
}
}
if (instruction is NondeterministicJumpInstruction) {
val originalTargets = instruction.targetLabels
val copyTargets = copyLabels(originalTargets, originalToCopy)
return instruction.copy(copyTargets)
}
return (instruction as InstructionImpl).copy()
}
private fun copyLabels(labels: Collection
