Prototyping DCE tool for JS

Author: Alexey Andreev

.idea/modules.xml

@@ -112,6 +112,7 @@
         <include name="js/js.inliner/src"/>
         <include name="js/js.parser/src"/>
         <include name="js/js.serializer/src"/>
+        <include name="js/js.dce/src"/>
         <include name="plugins/annotation-collector/src"/>
     </dirset>
 
@@ -152,6 +153,7 @@
         <include name="js.inliner/**"/>
         <include name="js.parser/**"/>
         <include name="js.serializer/**"/>
+        <include name="js.dce/**"/>
     </patternset>
 
     <path id="compilerSources.path">
@@ -265,6 +267,7 @@
             <fileset dir="js/js.inliner/src"/>
             <fileset dir="js/js.parser/src"/>
             <fileset dir="js/js.serializer/src"/>
+            <fileset dir="js/js.dce/src"/>
             <zipfileset file="${kotlin-home}/build.txt" prefix="META-INF"/>
 
             <manifest>

build.xml

@@ -24,5 +24,6 @@
     <orderEntry type="module" module-name="builtins-serializer" />
     <orderEntry type="module" module-name="frontend.script" />
     <orderEntry type="module" module-name="javac-wrapper" />
+    <orderEntry type="module" module-name="js.dce" />
   </component>
 </module>

compiler/cli/cli.iml

@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+
+@file:JvmName("K2JSDce")
+package org.jetbrains.kotlin.cli.js.dce
+
+import org.jetbrains.kotlin.js.dce.DeadCodeElimination
+import org.jetbrains.kotlin.js.dce.InputFile
+import org.jetbrains.kotlin.js.dce.extractRoots
+import org.jetbrains.kotlin.js.dce.printTree
+
+fun main(args: Array<String>) {
+    val files = args.map { InputFile(it) }
+    val nodes = DeadCodeElimination.run(files, emptySet()) { println(it) }
+
+    println()
+    for (node in nodes.extractRoots()) {
+        printTree(node, { println(it) }, printNestedMembers = false, showLocations = true)
+    }
+}

compiler/cli/src/org/jetbrains/kotlin/cli/js/dce/K2JSDce.kt

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="PROVIDED" name="intellij-core" level="project" />
+    <orderEntry type="module" module-name="js.ast" />
+    <orderEntry type="module" module-name="js.inliner" />
+    <orderEntry type="module" module-name="js.translator" />
+    <orderEntry type="module" module-name="util" />
+  </component>
+</module>

js/js.dce/js.dce.iml

@@ -0,0 +1,34 @@
+/*
+ * 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 org.jetbrains.kotlin.js.backend.ast.JsFunction
+import org.jetbrains.kotlin.js.backend.ast.JsInvocation
+import org.jetbrains.kotlin.js.backend.ast.JsNode
+import org.jetbrains.kotlin.js.dce.Context.Node
+
+interface AnalysisResult {
+    val nodeMap: Map<JsNode, Node>
+
+    val astNodesToEliminate: Set<JsNode>
+
+    val astNodesToSkip: Set<JsNode>
+
+    val functionsToEnter: Set<JsFunction>
+
+    val invocationsToSkip: Set<JsInvocation>
+}