Prototyping DCE tool for JS

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

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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.
+ */
+
+@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)
+    }
+}