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// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8;
import com.android.tools.r8.utils.ArchiveBuilder;
import com.android.tools.r8.utils.DescriptorUtils;
import com.android.tools.r8.utils.DirectoryBuilder;
import com.android.tools.r8.utils.OutputBuilder;
import com.android.tools.r8.utils.ZipUtils;
import com.google.common.io.Closer;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.List;
import java.util.Set;
import java.util.zip.ZipOutputStream;
/**
* Consumer for Java classfile encoded programs.
*
* <p>This consumer can only be provided to R8.
*/
@KeepForSubclassing
public interface ClassFileConsumer extends ProgramConsumer {
/**
* Callback to receive Java classfile data for a compilation output.
*
* <p>There is no guaranteed order and files might be written concurrently.
*
* <p>The consumer is expected not to throw, but instead report any errors via the diagnostics
* {@param handler}. If an error is reported via {@param handler} and no exceptions are thrown,
* then the compiler guaranties to exit with an error.
*
* <p>The {@link ByteDataView} {@param data} object can only be assumed valid during the duration
* of the accept. If the bytes are needed beyond that, a copy must be made elsewhere.
*
* @param data Java class-file encoded data.
* @param descriptor Class descriptor of the class the data pertains to.
* @param handler Diagnostics handler for reporting.
*/
void accept(ByteDataView data, String descriptor, DiagnosticsHandler handler);
/** Empty consumer to request the production of the resource but ignore its value. */
static ClassFileConsumer emptyConsumer() {
return ForwardingConsumer.EMPTY_CONSUMER;
}
/** Forwarding consumer to delegate to an optional existing consumer. */
@Keep
class ForwardingConsumer implements ClassFileConsumer {
private static final ClassFileConsumer EMPTY_CONSUMER = new ForwardingConsumer(null);
private final ClassFileConsumer consumer;
public ForwardingConsumer(ClassFileConsumer consumer) {
this.consumer = consumer;
}
@Override
public DataResourceConsumer getDataResourceConsumer() {
return consumer != null ? consumer.getDataResourceConsumer() : null;
}
@Override
public void accept(ByteDataView data, String descriptor, DiagnosticsHandler handler) {
if (consumer != null) {
consumer.accept(data, descriptor, handler);
}
}
@Override
public void finished(DiagnosticsHandler handler) {
if (consumer != null) {
consumer.finished(handler);
}
}
}
/** Consumer to write program resources to an output. */
@Keep
class ArchiveConsumer extends ForwardingConsumer
implements DataResourceConsumer, InternalProgramOutputPathConsumer {
private final OutputBuilder outputBuilder;
protected final boolean consumeDataResources;
public ArchiveConsumer(Path archive) {
this(archive, null, false);
}
public ArchiveConsumer(Path archive, boolean consumeDataResouces) {
this(archive, null, consumeDataResouces);
}
public ArchiveConsumer(Path archive, ClassFileConsumer consumer) {
this(archive, consumer, false);
}
public ArchiveConsumer(Path archive, ClassFileConsumer consumer, boolean consumeDataResouces) {
super(consumer);
this.outputBuilder = new ArchiveBuilder(archive);
this.consumeDataResources = consumeDataResouces;
this.outputBuilder.open();
if (getDataResourceConsumer() != null) {
this.outputBuilder.open();
}
}
@Override
public DataResourceConsumer getDataResourceConsumer() {
return consumeDataResources ? this : null;
}
@Override
public void accept(ByteDataView data, String descriptor, DiagnosticsHandler handler) {
super.accept(data, descriptor, handler);
outputBuilder.addFile(DescriptorUtils.getClassFileName(descriptor), data, handler);
}
@Override
public void accept(DataDirectoryResource directory, DiagnosticsHandler handler) {
outputBuilder.addDirectory(directory.getName(), handler);
}
@Override
public void accept(DataEntryResource file, DiagnosticsHandler handler) {
outputBuilder.addFile(file.getName(), file, handler);
}
@Override
public void finished(DiagnosticsHandler handler) {
super.finished(handler);
outputBuilder.close(handler);
}
@Override
public Path internalGetOutputPath() {
return outputBuilder.getPath();
}
public static void writeResources(
Path archive, List<ProgramResource> resources, Set<DataEntryResource> dataResources)
throws IOException, ResourceException {
OpenOption[] options =
new OpenOption[] {StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING};
try (Closer closer = Closer.create()) {
try (ZipOutputStream out =
new ZipOutputStream(
new BufferedOutputStream(Files.newOutputStream(archive, options)))) {
ZipUtils.writeResourcesToZip(resources, dataResources, closer, out);
}
}
}
}
/** Directory consumer to write program resources to a directory. */
@Keep
class DirectoryConsumer extends ForwardingConsumer implements InternalProgramOutputPathConsumer {
private final OutputBuilder outputBuilder;
protected final boolean consumeDataResouces;
public DirectoryConsumer(Path directory) {
this(directory, null, false);
}
public DirectoryConsumer(Path directory, boolean consumeDataResouces) {
this(directory, null, consumeDataResouces);
}
public DirectoryConsumer(Path directory, ClassFileConsumer consumer) {
this(directory, consumer, false);
}
public DirectoryConsumer(
Path directory, ClassFileConsumer consumer, boolean consumeDataResouces) {
super(consumer);
this.outputBuilder = new DirectoryBuilder(directory);
this.consumeDataResouces = consumeDataResouces;
}
@Override
public DataResourceConsumer getDataResourceConsumer() {
return consumeDataResouces ? this : null;
}
@Override
public void accept(ByteDataView data, String descriptor, DiagnosticsHandler handler) {
super.accept(data, descriptor, handler);
outputBuilder.addFile(DescriptorUtils.getClassFileName(descriptor), data, handler);
}
@Override
public void accept(DataDirectoryResource directory, DiagnosticsHandler handler) {
outputBuilder.addDirectory(directory.getName(), handler);
}
@Override
public void accept(DataEntryResource file, DiagnosticsHandler handler) {
outputBuilder.addFile(file.getName(), file, handler);
}
@Override
public void finished(DiagnosticsHandler handler) {
super.finished(handler);
}
@Override
public Path internalGetOutputPath() {
return outputBuilder.getPath();
}
}
}