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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.
package com.google.devtools.build.android.desugar;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.collect.Iterators;
import com.google.common.collect.UnmodifiableIterator;
import com.google.common.io.ByteStreams;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Test data generator for b/62456849. This class converts methods satisfying the following
* conditions to synthetic methods.
* <li>The name starts with "lambda$"
* <li>Not synthetic
*/
public class Bug62456849TestDataGenerator {
public static void main(String[] args) throws IOException {
checkArgument(
args.length == 2,
"Usage: %s <input-jar> <output-jar>",
Bug62456849TestDataGenerator.class.getName());
Path inputJar = Paths.get(args[0]);
checkArgument(Files.isRegularFile(inputJar), "The input jar %s is not a file", inputJar);
Path outputJar = Paths.get(args[1]);
try (ZipFile inputZip = new ZipFile(inputJar.toFile());
ZipOutputStream outZip =
new ZipOutputStream(new BufferedOutputStream(Files.newOutputStream(outputJar)))) {
for (UnmodifiableIterator<? extends ZipEntry> it =
Iterators.forEnumeration(inputZip.entries());
it.hasNext(); ) {
ZipEntry entry = it.next();
String entryName = entry.getName();
byte[] content =
entryName.endsWith(".class")
? convertClass(inputZip, entry)
: readEntry(inputZip, entry);
writeToZipFile(outZip, entryName, content);
}
}
}
private static void writeToZipFile(ZipOutputStream outZip, String entryName, byte[] content)
throws IOException {
ZipEntry result = new ZipEntry(entryName);
result.setTime(0L);
outZip.putNextEntry(result);
outZip.write(content);
outZip.closeEntry();
}
private static byte[] readEntry(ZipFile file, ZipEntry entry) throws IOException {
try (InputStream is = file.getInputStream(entry)) {
return ByteStreams.toByteArray(is);
}
}
private static byte[] convertClass(ZipFile file, ZipEntry entry) throws IOException {
try (InputStream content = file.getInputStream(entry)) {
ClassReader reader = new ClassReader(content);
ClassWriter writer = new ClassWriter(0);
ClassVisitor converter =
new ClassVisitor(Opcodes.ASM5, writer) {
@Override
public MethodVisitor visitMethod(
int access, String name, String desc, String signature, String[] exceptions) {
if (name.startsWith("lambda$") && (access & Opcodes.ACC_SYNTHETIC) == 0) {
access |= Opcodes.ACC_SYNTHETIC;
}
return super.visitMethod(access, name, desc, signature, exceptions);
}
};
reader.accept(converter, 0);
return writer.toByteArray();
}
}
}
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