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Support direct classpaths in javac-turbine
PiperOrigin-RevId: 167520688
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135
...ava_tools/buildjar/java/com/google/devtools/build/java/turbine/javac/JavacTransitive.java
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| // Copyright 2017 The Bazel Authors. All rights reserved. | ||
| // | ||
| // 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. | ||
|
|
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| package com.google.devtools.build.java.turbine.javac; | ||
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| import com.google.common.collect.ImmutableSet; | ||
| import com.google.common.io.ByteStreams; | ||
| import com.google.devtools.build.buildjar.javac.plugins.dependency.StrictJavaDepsPlugin; | ||
| import com.google.turbine.bytecode.ClassFile; | ||
| import com.google.turbine.bytecode.ClassReader; | ||
| import com.google.turbine.bytecode.ClassWriter; | ||
| import com.google.turbine.deps.Transitive; | ||
| import com.sun.tools.javac.code.Symbol; | ||
| import com.sun.tools.javac.code.Symbol.ClassSymbol; | ||
| import com.sun.tools.javac.code.Type; | ||
| import com.sun.tools.javac.comp.AttrContext; | ||
| import com.sun.tools.javac.comp.Env; | ||
| import com.sun.tools.javac.tree.JCTree.JCClassDecl; | ||
| import com.sun.tools.javac.tree.TreeScanner; | ||
| import java.io.IOError; | ||
| import java.io.IOException; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.LinkedHashSet; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import javax.tools.JavaCompiler; | ||
| import javax.tools.JavaFileObject; | ||
| import javax.tools.JavaFileObject.Kind; | ||
|
|
||
| /** | ||
| * Collects the minimal compile-time API for symbols in the supertype closure of compiled classes. | ||
| * This allows non-javac header compilations to be performed against a classpath containing only | ||
| * direct dependencies and no transitive dependencies. | ||
| * | ||
| * <p>See {@link Transitive} for the parallel implementation in non-javac turbine. | ||
| */ | ||
| public class JavacTransitive { | ||
|
|
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| private final ImmutableSet<String> platformJars; | ||
|
|
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| public JavacTransitive(ImmutableSet<String> platformJars) { | ||
| this.platformJars = platformJars; | ||
| } | ||
|
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| private final Set<ClassSymbol> closure = new LinkedHashSet<>(); | ||
| private Map<String, byte[]> transitive = new LinkedHashMap<>(); | ||
|
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| /** | ||
| * Collects re-packaged transitive dependencies, and reset shared state. (The instance may be | ||
| * re-used, e.g. after fall back from the reduced classpath optimization.) | ||
| */ | ||
| public Map<String, byte[]> collectTransitiveDependencies() { | ||
| Map<String, byte[]> result = transitive; | ||
| transitive = new LinkedHashMap<>(); | ||
| return result; | ||
| } | ||
|
|
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| /** | ||
| * Records the super type closure of all class declarations in the given compilation unit. Called | ||
| * after attribute is complete for a compilation unit. | ||
| */ | ||
| public void postAttribute(Env<AttrContext> result) { | ||
| result.toplevel.accept( | ||
| new TreeScanner() { | ||
| @Override | ||
| public void visitClassDef(JCClassDecl tree) { | ||
| recordSuperClosure(tree.sym); | ||
| super.visitClassDef(tree); | ||
| } | ||
| }); | ||
| } | ||
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|
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| /** | ||
| * Finish collecting and repackaging. Called while compilation state is still available (e.g. file | ||
| * objects are still open). This method should be idempotent, as {@link JavaCompiler}s sometimes | ||
| * get closed twice. | ||
| */ | ||
| public void finish() { | ||
| Set<ClassSymbol> directChildren = new LinkedHashSet<>(); | ||
| for (ClassSymbol sym : closure) { | ||
| for (Symbol member : sym.getEnclosedElements()) { | ||
| if (member instanceof ClassSymbol) { | ||
| directChildren.add((ClassSymbol) member); | ||
| } | ||
| } | ||
| } | ||
| closure.addAll(directChildren); | ||
| for (ClassSymbol sym : closure) { | ||
| String name = sym.flatName().toString().replace('.', '/'); | ||
| if (transitive.containsKey(name)) { | ||
| continue; | ||
| } | ||
| if (StrictJavaDepsPlugin.getJarName(sym, platformJars) == null) { | ||
| // Don't repackage symbols we wouldn't report in jdeps, e.g. because they're on the | ||
| // bootclasspath. | ||
| continue; | ||
| } | ||
| JavaFileObject jfo = sym.classfile; | ||
| if (jfo == null || jfo.getKind() != Kind.CLASS) { | ||
| continue; | ||
| } | ||
| ClassFile cf; | ||
| try { | ||
| cf = ClassReader.read(ByteStreams.toByteArray(jfo.openInputStream())); | ||
| } catch (IOException e) { | ||
| throw new IOError(e); | ||
| } | ||
| transitive.put(name, ClassWriter.writeClass(Transitive.trimClass(cf))); | ||
| } | ||
| closure.clear(); | ||
| } | ||
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| private void recordSuperClosure(Symbol bound) { | ||
| if (!(bound instanceof ClassSymbol)) { | ||
| return; | ||
| } | ||
| ClassSymbol info = (ClassSymbol) bound; | ||
| closure.add(info); | ||
| recordSuperClosure(info.getSuperclass().asElement()); | ||
| for (Type i : info.getInterfaces()) { | ||
| recordSuperClosure(i.asElement()); | ||
| } | ||
| } | ||
| } |
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