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// Copyright 2016 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.
package com.google.devtools.build.java.turbine.javac;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.jimfs.Configuration;
import com.google.common.jimfs.Jimfs;
import com.google.devtools.build.buildjar.javac.plugins.dependency.StrictJavaDepsPlugin;
import com.google.devtools.build.java.turbine.javac.JavacTurbineCompileResult.Status;
import com.sun.source.util.JavacTask;
import com.sun.tools.javac.api.ClientCodeWrapper.Trusted;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.file.CacheFSInfo;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.FileSystem;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import javax.annotation.Nullable;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
/** Performs a javac-based turbine compilation given a {@link JavacTurbineCompileRequest}. */
public class JavacTurbineCompiler {
static JavacTurbineCompileResult compile(JavacTurbineCompileRequest request) throws IOException {
Map<String, byte[]> files = new LinkedHashMap<>();
Status status;
StringWriter sw = new StringWriter();
ImmutableList.Builder<FormattedDiagnostic> diagnostics = ImmutableList.builder();
Context context = new Context();
try (PrintWriter pw = new PrintWriter(sw)) {
setupContext(context, request.strictJavaDepsPlugin(), request.transitivePlugin());
CacheFSInfo.preRegister(context);
try (FileSystem fs = Jimfs.newFileSystem(Configuration.forCurrentPlatform());
JavacFileManager fm = new ClassloaderMaskingFileManager()) {
JavacTask task =
JavacTool.create()
.getTask(
pw,
fm,
diagnostic -> diagnostics.add(formatDiagnostic(diagnostic)),
request.javacOptions(),
ImmutableList.of() /*classes*/,
fm.getJavaFileObjectsFromPaths(request.sources()),
context);
Path classes = fs.getPath("classes");
Files.createDirectories(classes);
Path sources = fs.getPath("sources");
Files.createDirectories(sources);
fm.setContext(context);
fm.setLocationFromPaths(StandardLocation.SOURCE_PATH, Collections.<Path>emptyList());
fm.setLocationFromPaths(StandardLocation.CLASS_PATH, request.classPath());
// The bootclasspath may legitimately be empty if --release is being used.
Collection<Path> bootClassPath = request.bootClassPath();
if (!bootClassPath.isEmpty()) {
fm.setLocationFromPaths(StandardLocation.PLATFORM_CLASS_PATH, bootClassPath);
}
fm.setLocationFromPaths(
StandardLocation.ANNOTATION_PROCESSOR_PATH, request.processorClassPath());
fm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, ImmutableList.of(classes));
fm.setLocationFromPaths(StandardLocation.SOURCE_OUTPUT, ImmutableList.of(sources));
status = task.call() ? Status.OK : Status.ERROR;
// collect class output
Files.walkFileTree(
classes,
new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path path, BasicFileAttributes attrs)
throws IOException {
files.put(classes.relativize(path).toString(), Files.readAllBytes(path));
return FileVisitResult.CONTINUE;
}
});
} catch (Throwable t) {
t.printStackTrace(pw);
status = Status.ERROR;
}
}
return new JavacTurbineCompileResult(
ImmutableMap.copyOf(files), status, sw.toString(), diagnostics.build(), context);
}
private static FormattedDiagnostic formatDiagnostic(
Diagnostic<? extends JavaFileObject> diagnostic) {
StringBuilder message = new StringBuilder();
if (diagnostic.getSource() != null) {
message.append(diagnostic.getSource().getName());
if (diagnostic.getLineNumber() != -1) {
message.append(':').append(diagnostic.getLineNumber());
}
message.append(": ");
}
message.append(diagnostic.getKind().toString().toLowerCase(Locale.getDefault()));
message.append(": ").append(diagnostic.getMessage(Locale.getDefault()));
return new FormattedDiagnostic(diagnostic, message.toString());
}
/** Mask the annotation processor classpath to avoid version skew. */
@Trusted
private static class ClassloaderMaskingFileManager extends JavacFileManager {
private static Context getContext() {
Context context = new Context();
CacheFSInfo.preRegister(context);
return context;
}
public ClassloaderMaskingFileManager() {
super(getContext(), false, UTF_8);
}
@Override
protected ClassLoader getClassLoader(URL[] urls) {
return new URLClassLoader(
urls,
new ClassLoader(null) {
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
Class<?> c = Class.forName(name);
if (name.startsWith("com.sun.source.") || name.startsWith("com.sun.tools.")) {
return c;
}
if (c.getClassLoader() == null
|| Objects.equals(getClassLoaderName(c.getClassLoader()), "platform")) {
return c;
}
throw new ClassNotFoundException(name);
}
});
}
}
// TODO(cushon): remove this use of reflection if Java 9 is released.
private static String getClassLoaderName(ClassLoader classLoader) {
Method method;
try {
method = ClassLoader.class.getMethod("getName");
} catch (NoSuchMethodException e) {
// ClassLoader#getName doesn't exist in JDK 8 and earlier.
return null;
}
try {
return (String) method.invoke(classLoader, new Object[] {});
} catch (ReflectiveOperationException e) {
throw new LinkageError(e.getMessage(), e);
}
}
static void setupContext(
Context context, @Nullable StrictJavaDepsPlugin sjd, JavacTransitive transitive) {
JavacTurbineJavaCompiler.preRegister(context, sjd, transitive);
}
}
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