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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.android.multidex;
import com.android.dx.cf.direct.DirectClassFile;
import com.android.dx.rop.cst.Constant;
import com.android.dx.rop.cst.ConstantPool;
import com.android.dx.rop.cst.CstFieldRef;
import com.android.dx.rop.cst.CstMethodRef;
import com.android.dx.rop.cst.CstType;
import com.android.dx.rop.type.Prototype;
import com.android.dx.rop.type.StdTypeList;
import com.android.dx.rop.type.Type;
import com.android.dx.rop.type.TypeList;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Tool to find direct class references to other classes.
*/
public class ClassReferenceListBuilder {
private static final String CLASS_EXTENSION = ".class";
private final Path path;
private final Set<String> classNames = new HashSet<String>();
public ClassReferenceListBuilder(Path path) {
this.path = path;
}
/**
* Kept for compatibility with the gradle integration, this method just forwards to
* {@link MainDexListBuilder#main(String[])}.
* @deprecated use {@link MainDexListBuilder#main(String[])} instead.
*/
@Deprecated
public static void main(String[] args) {
MainDexListBuilder.main(args);
}
/**
* @param jarOfRoots Archive containing the class files resulting of the tracing, typically
* this is the result of running ProGuard.
*/
public void addRoots(ZipFile jarOfRoots) throws IOException {
// keep roots
for (Enumeration<? extends ZipEntry> entries = jarOfRoots.entries();
entries.hasMoreElements();) {
ZipEntry entry = entries.nextElement();
String name = entry.getName();
if (name.endsWith(CLASS_EXTENSION)) {
classNames.add(name.substring(0, name.length() - CLASS_EXTENSION.length()));
}
}
// keep direct references of roots (+ direct references hierarchy)
for (Enumeration<? extends ZipEntry> entries = jarOfRoots.entries();
entries.hasMoreElements();) {
ZipEntry entry = entries.nextElement();
String name = entry.getName();
if (name.endsWith(CLASS_EXTENSION)) {
DirectClassFile classFile;
try {
classFile = path.getClass(name);
} catch (FileNotFoundException e) {
throw new IOException("Class " + name +
" is missing form original class path " + path, e);
}
addDependencies(classFile.getConstantPool());
}
}
}
Set<String> getClassNames() {
return classNames;
}
private void addDependencies(ConstantPool pool) {
for (Constant constant : pool.getEntries()) {
if (constant instanceof CstType) {
checkDescriptor(((CstType) constant).getClassType());
} else if (constant instanceof CstFieldRef) {
checkDescriptor(((CstFieldRef) constant).getType());
} else if (constant instanceof CstMethodRef) {
Prototype proto = ((CstMethodRef) constant).getPrototype();
checkDescriptor(proto.getReturnType());
StdTypeList args = proto.getParameterTypes();
for (int i = 0; i < args.size(); i++) {
checkDescriptor(args.get(i));
}
}
}
}
private void checkDescriptor(Type type) {
String descriptor = type.getDescriptor();
if (descriptor.endsWith(";")) {
int lastBrace = descriptor.lastIndexOf('[');
if (lastBrace < 0) {
addClassWithHierachy(descriptor.substring(1, descriptor.length()-1));
} else {
assert descriptor.length() > lastBrace + 3
&& descriptor.charAt(lastBrace + 1) == 'L';
addClassWithHierachy(descriptor.substring(lastBrace + 2,
descriptor.length() - 1));
}
}
}
private void addClassWithHierachy(String classBinaryName) {
if (classNames.contains(classBinaryName)) {
return;
}
try {
DirectClassFile classFile = path.getClass(classBinaryName + CLASS_EXTENSION);
classNames.add(classBinaryName);
CstType superClass = classFile.getSuperclass();
if (superClass != null) {
addClassWithHierachy(superClass.getClassType().getClassName());
}
TypeList interfaceList = classFile.getInterfaces();
int interfaceNumber = interfaceList.size();
for (int i = 0; i < interfaceNumber; i++) {
addClassWithHierachy(interfaceList.getType(i).getClassName());
}
} catch (FileNotFoundException e) {
// Ignore: The referenced type is not in the path it must be part of the libraries.
}
}
}
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