org.jetbrains.kotlin.js.dce.Context.kt Maven / Gradle / Ivy
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the Kotlin compiler embeddable
/*
* 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.js.dce
import com.google.common.collect.LinkedHashMultimap
import org.jetbrains.kotlin.js.backend.ast.*
import org.jetbrains.kotlin.js.backend.ast.metadata.SpecialFunction
import org.jetbrains.kotlin.js.backend.ast.metadata.specialFunction
import org.jetbrains.kotlin.js.translate.utils.JsAstUtils
import org.jetbrains.kotlin.js.translate.utils.jsAstUtils.array
import org.jetbrains.kotlin.js.translate.utils.jsAstUtils.index
class Context {
// Collections per Node consumes too much RAM
private val nodeDependencies = LinkedHashMultimap.create()
private val nodeExpressions = LinkedHashMultimap.create()
private val nodeFunctions = LinkedHashMultimap.create()
private val nodeUsedByAstNodes = LinkedHashMultimap.create()
val globalScope = Node()
val moduleExportsNode = globalScope.member("module").member("exports")
var currentModule = globalScope
val nodes = mutableMapOf()
var thisNode: Node? = globalScope
val namesOfLocalVars = mutableSetOf()
fun addNodesForLocalVars(names: Collection) {
nodes += names.filter { it !in nodes }.associate { it to Node(it) }
}
fun markSpecialFunctions(root: JsNode) {
val candidates = mutableMapOf()
val unsuitableNames = mutableSetOf()
val assignedNames = mutableSetOf()
root.accept(object : RecursiveJsVisitor() {
override fun visit(x: JsVars.JsVar) {
val name = x.name
if (!assignedNames.add(name)) {
unsuitableNames += name
}
val initializer = x.initExpression
if (initializer != null) {
val specialName = when {
isDefineInlineFunction(initializer) -> SpecialFunction.DEFINE_INLINE_FUNCTION
isWrapFunction(initializer) -> SpecialFunction.WRAP_FUNCTION
else -> null
}
specialName?.let { candidates[name] = specialName }
}
super.visit(x)
}
override fun visitBinaryExpression(x: JsBinaryOperation) {
JsAstUtils.decomposeAssignmentToVariable(x)?.let { (left, _) -> unsuitableNames += left }
}
override fun visitFunction(x: JsFunction) {
x.name?.let { unsuitableNames += it }
}
})
for ((name, function) in candidates) {
if (name !in unsuitableNames) {
name.specialFunction = function
}
}
}
fun extractNode(expression: JsExpression): Node? {
val node = extractNodeImpl(expression)?.original
return if (node != null && moduleExportsNode in generateSequence(node) { it.parent }) {
val path = node.pathFromRoot().drop(2)
path.fold(currentModule.original) { n, memberName -> n.member(memberName) }
}
else {
node
}
}
private fun extractNodeImpl(expression: JsExpression): Node? {
return when (expression) {
is JsNameRef -> {
val qualifier = expression.qualifier
if (qualifier == null) {
val name = expression.name
if (name != null) {
if (name in namesOfLocalVars) return null
nodes[name]?.original?.let { return it }
}
globalScope.member(expression.ident)
}
else {
extractNodeImpl(qualifier)?.member(expression.ident)
}
}
is JsArrayAccess -> {
val index = expression.index
if (index is JsStringLiteral) extractNodeImpl(expression.array)?.member(index.value) else null
}
is JsThisRef -> {
thisNode
}
is JsInvocation -> {
val qualifier = expression.qualifier
if (qualifier is JsNameRef && qualifier.qualifier == null && qualifier.ident == "require" &&
qualifier.name !in nodes && expression.arguments.size == 1
) {
val argument = expression.arguments[0]
if (argument is JsStringLiteral) {
return globalScope.member(argument.value)
}
}
null
}
else -> {
null
}
}
}
private var currentColor = 1.toByte()
fun clearVisited() {
currentColor++
}
fun visit(n: Node) = n.visit(currentColor)
inner class Node private constructor(val localName: JsName?, parent: Node?, val memberName: String?) {
private var _membersImpl: MutableMap? = null
private val membersImpl: MutableMap
get() = _membersImpl ?: mutableMapOf().also { _membersImpl = it }
private var rank = 0
private var hasSideEffectsImpl = false
private var reachableImpl = false
private var declarationReachableImpl = false
val dependencies: Set get() = nodeDependencies[original]
val expressions: Set get() = nodeExpressions[original]
val functions: Set get() = nodeFunctions[original]
val usedByAstNodes: Set get() = nodeUsedByAstNodes[original]
var hasSideEffects: Boolean
get() = original.hasSideEffectsImpl
set(value) {
original.hasSideEffectsImpl = value
}
var reachable: Boolean
get() = original.reachableImpl
set(value) {
original.reachableImpl = value
}
var declarationReachable: Boolean
get() = original.declarationReachableImpl
set(value) {
original.declarationReachableImpl = value
}
var parent: Node? = parent
private set
private var color: Byte = 0
fun visit(c: Byte): Boolean {
val result = color != c
color = c
return result
}
val memberNames: Set get() = original._membersImpl?.keys ?: emptySet()
constructor(localName: JsName? = null) : this(localName, null, null)
var original: Node = this
get() {
if (field != this) {
field = field.original
}
return field
}
private set
val members: Map get() = original._membersImpl ?: emptyMap()
fun addDependency(node: Node) {
nodeDependencies.put(original, node)
}
fun addFunction(function: JsFunction) {
nodeFunctions.put(original, function)
}
fun addExpression(expression: JsExpression) {
nodeExpressions.put(original, expression)
}
fun addUsedByAstNode(node: JsNode) {
nodeUsedByAstNodes.put(original, node)
}
fun member(name: String): Node = original.membersImpl.getOrPut(name) { Node(null, this, name) }.original
fun alias(other: Node) {
val a = original
val b = other.original
if (a == b) return
if (a.parent == null && b.parent == null) {
a.merge(b)
}
else if (a.parent == null) {
if (b.root() == a) a.makeDependencies(b) else b.evacuateFrom(a)
}
else if (b.parent == null) {
if (a.root() == b) a.makeDependencies(b) else a.evacuateFrom(b)
}
else {
a.makeDependencies(b)
}
}
private fun makeDependencies(other: Node) {
nodeDependencies.put(this, other)
nodeDependencies.put(other, this)
}
private fun evacuateFrom(other: Node) {
val (existingMembers, newMembers) = other.members.toList().partition { (name, _) -> name in membersImpl }
other.original = this
for ((name, member) in newMembers) {
membersImpl[name] = member
member.original.parent = this
}
for ((name, member) in existingMembers) {
membersImpl[name]!!.original.merge(member.original)
membersImpl[name] = member.original
member.original.parent = this
}
other.membersImpl.clear()
hasSideEffectsImpl = hasSideEffectsImpl || other.hasSideEffectsImpl
nodeExpressions.putAll(this, nodeExpressions[other])
nodeFunctions.putAll(this, nodeFunctions[other])
nodeDependencies.putAll(this, nodeDependencies[other])
nodeUsedByAstNodes.putAll(this, nodeUsedByAstNodes[other])
nodeExpressions.removeAll(other)
nodeFunctions.removeAll(other)
nodeDependencies.removeAll(other)
nodeUsedByAstNodes.removeAll(other)
}
private fun merge(other: Node) {
if (this == other) return
if (rank < other.rank) {
other.evacuateFrom(this)
}
else {
evacuateFrom(other)
}
if (rank == other.rank) {
rank++
}
}
fun root(): Node = generateSequence(original) { it.parent?.original }.last()
fun pathFromRoot(): List =
generateSequence(original) { it.parent?.original }.mapNotNull { it.memberName }
.toList().asReversed()
override fun toString(): String = (root().localName?.ident ?: "") + pathFromRoot().joinToString("") { ".$it" }
}
}