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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.dexer;
import com.android.dex.Dex;
import com.android.dex.FieldId;
import com.android.dex.MethodId;
import com.android.dex.ProtoId;
import com.android.dex.TypeList;
import com.google.auto.value.AutoValue;
import com.google.auto.value.extension.memoized.Memoized;
import com.google.common.collect.ImmutableList;
import java.util.HashSet;
/**
* Helper to track how many unique field and method references we've seen in a given set of .dex
* files.
*/
class DexLimitTracker {
private final HashSet<FieldDescriptor> fieldsSeen = new HashSet<>();
private final HashSet<MethodDescriptor> methodsSeen = new HashSet<>();
private final int maxNumberOfIdxPerDex;
public DexLimitTracker(int maxNumberOfIdxPerDex) {
this.maxNumberOfIdxPerDex = maxNumberOfIdxPerDex;
}
/**
* Tracks the field and method references in the given file and returns whether we're within
* limits.
*
* @return {@code true} if method or field references are outside limits, {@code false} both
* are within limits.
*/
public boolean track(Dex dexFile) {
trackFieldsAndMethods(dexFile);
return fieldsSeen.size() > maxNumberOfIdxPerDex
|| methodsSeen.size() > maxNumberOfIdxPerDex;
}
public void clear() {
fieldsSeen.clear();
methodsSeen.clear();
}
private void trackFieldsAndMethods(Dex dexFile) {
int fieldCount = dexFile.fieldIds().size();
for (int fieldIndex = 0; fieldIndex < fieldCount; ++fieldIndex) {
fieldsSeen.add(FieldDescriptor.fromDex(dexFile, fieldIndex));
}
int methodCount = dexFile.methodIds().size();
for (int methodIndex = 0; methodIndex < methodCount; ++methodIndex) {
methodsSeen.add(MethodDescriptor.fromDex(dexFile, methodIndex));
}
}
private static String typeName(Dex dex, int typeIndex) {
return dex.typeNames().get(typeIndex);
}
@AutoValue
abstract static class FieldDescriptor {
static FieldDescriptor fromDex(Dex dex, int fieldIndex) {
FieldId field = dex.fieldIds().get(fieldIndex);
String name = dex.strings().get(field.getNameIndex());
String declaringClass = typeName(dex, field.getDeclaringClassIndex());
String type = typeName(dex, field.getTypeIndex());
return new AutoValue_DexLimitTracker_FieldDescriptor(declaringClass, name, type);
}
abstract String declaringClass();
abstract String fieldName();
abstract String fieldType();
@Override
@Memoized
public abstract int hashCode();
}
@AutoValue
abstract static class MethodDescriptor {
static MethodDescriptor fromDex(Dex dex, int methodIndex) {
MethodId method = dex.methodIds().get(methodIndex);
ProtoId proto = dex.protoIds().get(method.getProtoIndex());
String name = dex.strings().get(method.getNameIndex());
String declaringClass = typeName(dex, method.getDeclaringClassIndex());
String returnType = typeName(dex, proto.getReturnTypeIndex());
TypeList parameterTypeIndices = dex.readTypeList(proto.getParametersOffset());
ImmutableList.Builder<String> parameterTypes = ImmutableList.builder();
for (short parameterTypeIndex : parameterTypeIndices.getTypes()) {
parameterTypes.add(typeName(dex, parameterTypeIndex & 0xFFFF));
}
return new AutoValue_DexLimitTracker_MethodDescriptor(
declaringClass, name, parameterTypes.build(), returnType);
}
abstract String declaringClass();
abstract String methodName();
abstract ImmutableList<String> parameterTypes();
abstract String returnType();
@Override
@Memoized
public abstract int hashCode();
}
}
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