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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 static com.google.common.base.Preconditions.checkState;
import com.android.dx.cf.direct.DirectClassFile;
import com.android.dx.dex.file.DexFile;
import java.io.IOException;
class MergingDexer {
// NB: The following two constants are copied from com.android.dx.command.dexer.Main
/**
* Maximum number of methods added during dexing:
* <ul>
* <li>Array.newInstance may be added by RopperMachine,
* <li>ArrayIndexOutOfBoundsException.<init> may be added by EscapeAnalysis
* </ul>
*/
private static final int MAX_METHOD_ADDED_DURING_DEX_CREATION = 2;
/** Maximum number of fields added during dexing: <primitive types box class>.TYPE. */
private static final int MAX_FIELD_ADDED_DURING_DEX_CREATION = 9;
private final int maxNumberOfIdxPerDex;
private final Dexing dexing;
private final DexFileAggregator dest;
private final boolean multidex;
private DexFile currentShard;
public MergingDexer(
Dexing dexing,
DexFileAggregator dest,
boolean multidex,
int maxNumberOfIdxPerDex) {
this.dexing = dexing;
this.dest = dest;
this.multidex = multidex;
this.maxNumberOfIdxPerDex = maxNumberOfIdxPerDex;
currentShard = dexing.newDexFile();
}
public MergingDexer add(DirectClassFile classFile) throws IOException {
if (multidex && !currentShard.isEmpty()) {
// NB: This code is copied from com.android.dx.command.dexer.Main
// Calculate max number of indices this class will add to the
// dex file.
// The possibility of overloading means that we can't easily
// know how many constant are needed for declared methods and
// fields. We therefore make the simplifying assumption that
// all constants are external method or field references.
int constantPoolSize = classFile.getConstantPool().size();
int maxMethodIdsInClass = constantPoolSize + classFile.getMethods().size()
+ MAX_METHOD_ADDED_DURING_DEX_CREATION;
int maxFieldIdsInClass = constantPoolSize + classFile.getFields().size()
+ MAX_FIELD_ADDED_DURING_DEX_CREATION;
if (maxNumberOfIdxPerDex < getCurrentShardFieldCount() + maxFieldIdsInClass
|| maxNumberOfIdxPerDex < getCurrentShardMethodCount() + maxMethodIdsInClass) {
// For simplicity just start a new shard to fit the given file
// Don't bother with waiting for a later file that might fit the old shard as in the extreme
// we'd have to wait until the end to write all shards.
rotateDexFile();
}
}
dexing.addToDexFile(currentShard, classFile);
return this;
}
public void finish() throws IOException {
if (currentShard != null && !currentShard.isEmpty()) {
dest.add(currentShard);
}
currentShard = null;
}
public void flush() throws IOException {
checkState(multidex);
if (!currentShard.isEmpty()) {
dest.add(currentShard);
}
currentShard = dexing.newDexFile();
}
private void rotateDexFile() throws IOException {
checkState(multidex);
checkState(!currentShard.isEmpty());
// We could take advantage here of knowing that currentShard is "full" and force dest to just
// write it out instead of it trying to merge currentShard with other .dex files.
// We're not doing that for the moment because that can cause problems when processing a
// main_dex_list: if dest's currentShard still contains classes from main_dex_list then writing
// our currentShard (with classes not from main dex list) separately would cause dest to write
// classes.dex with our currentShard and classes from main_dex_list to end up in classes2.dex or
// later, unless we prevent that case somehow (e.g., by knowing that order matters when writing
// the first shard).
dest.add(currentShard);
currentShard = dexing.newDexFile();
}
private int getCurrentShardMethodCount() {
return currentShard.getMethodIds().items().size();
}
private int getCurrentShardFieldCount() {
return currentShard.getFieldIds().items().size();
}
}
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