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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.android.dexer;
import com.google.auto.value.AutoValue;
import com.google.common.annotations.VisibleForTesting;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionsBase;
import com.android.dx.cf.direct.DirectClassFile;
import com.android.dx.cf.direct.StdAttributeFactory;
import com.android.dx.command.DxConsole;
import com.android.dx.dex.DexOptions;
import com.android.dx.dex.cf.CfOptions;
import com.android.dx.dex.cf.CfTranslator;
import com.android.dx.dex.code.PositionList;
import com.android.dx.dex.file.ClassDefItem;
import com.android.dx.dex.file.DexFile;
import com.android.dx.util.ByteArray;
/**
* Common helper class that encodes Java classes into {@link DexFile}s.
*/
class Dexing {
/**
* Common command line options for use with {@link Dexing}.
*/
public static class DexingOptions extends OptionsBase {
@Option(name = "locals",
defaultValue = "true", // dx's default
category = "semantics",
allowMultiple = false,
help = "Whether to include local variable tables (useful for debugging).")
public boolean localInfo;
@Option(name = "optimize",
defaultValue = "true", // dx's default
category = "semantics",
allowMultiple = false,
help = "Whether to do SSA/register optimization.")
public boolean optimize;
@Option(name = "warning",
defaultValue = "true", // dx's default
category = "misc",
allowMultiple = false,
help = "Whether to print warnings.")
public boolean printWarnings;
public CfOptions toCfOptions() {
CfOptions result = new CfOptions();
result.localInfo = this.localInfo;
result.optimize = this.optimize;
result.warn = printWarnings ? DxConsole.err : DxConsole.noop;
// Use dx's defaults
result.optimizeListFile = null;
result.dontOptimizeListFile = null;
result.positionInfo = PositionList.LINES;
result.strictNameCheck = true;
result.statistics = false; // we're not supporting statistics anyways
return result;
}
public DexOptions toDexOptions() {
DexOptions result = new DexOptions();
result.forceJumbo = false; // dx's default
return result;
}
}
/**
* Class file and possible dexing options, to look up dexing results in caches.
*/
@AutoValue
abstract static class DexingKey {
static DexingKey create(boolean localInfo, boolean optimize, byte[] classfileContent) {
// TODO(bazel-team): Maybe we can use a minimal collision hash instead of full content
return new AutoValue_Dexing_DexingKey(localInfo, optimize, classfileContent);
}
/** Returns whether {@link CfOptions#localInfo local variable information} is included. */
abstract boolean localInfo();
/** Returns whether {@link CfOptions#optimize SSA/register optimization} is performed. */
abstract boolean optimize();
/** Returns the class file to dex, <b>not</b> the dexed class. Don't modify the return value! */
@SuppressWarnings("mutable") abstract byte[] classfileContent();
}
private final DexOptions dexOptions;
private final CfOptions cfOptions;
public Dexing(DexingOptions options) {
this(options.toDexOptions(), options.toCfOptions());
}
@VisibleForTesting
Dexing(DexOptions dexOptions, CfOptions cfOptions) {
this.dexOptions = dexOptions;
this.cfOptions = cfOptions;
}
public static DirectClassFile parseClassFile(byte[] classfile, String classfilePath) {
DirectClassFile result = new DirectClassFile(
new ByteArray(classfile), classfilePath, /*strictParse*/ false);
result.setAttributeFactory(StdAttributeFactory.THE_ONE);
result.getMagic(); // triggers the parsing
return result;
}
public DexFile newDexFile() {
return new DexFile(dexOptions);
}
public ClassDefItem addToDexFile(DexFile dest, DirectClassFile classFile) {
ClassDefItem result = CfTranslator.translate(classFile,
(byte[]) null /*ignored*/,
cfOptions,
dest.getDexOptions(),
dest);
dest.add(result);
return result;
}
public DexingKey getDexingKey(byte[] classfile) {
return DexingKey.create(cfOptions.localInfo, cfOptions.optimize, classfile);
}
}
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