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/*
* Copyright (C) 2011 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.dx.command.findusages;
import com.android.dx.io.ClassData;
import com.android.dx.io.ClassDef;
import com.android.dx.io.CodeReader;
import com.android.dx.io.DecodedInstruction;
import com.android.dx.io.DexBuffer;
import com.android.dx.io.FieldId;
import com.android.dx.io.MethodId;
import com.android.dx.io.OpcodeInfo;
import java.io.PrintStream;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public final class FindUsages {
private final DexBuffer dex;
private final Set<Integer> methodIds;
private final Set<Integer> fieldIds;
private final CodeReader codeReader = new CodeReader();
private final PrintStream out;
private ClassDef currentClass;
private ClassData.Method currentMethod;
public FindUsages(DexBuffer dex, String declaredBy, String memberName, final PrintStream out) {
this.dex = dex;
this.out = out;
int typeStringIndex = Collections.binarySearch(dex.strings(), declaredBy);
int memberNameIndex = Collections.binarySearch(dex.strings(), memberName);
if (typeStringIndex < 0 || memberNameIndex < 0) {
methodIds = null;
fieldIds = null;
return; // these symbols are not mentioned in this dex
}
int typeIndex = Collections.binarySearch(dex.typeIds(), typeStringIndex);
if (typeIndex < 0) {
methodIds = null;
fieldIds = null;
return; // this type name isn't used as a type in this dex
}
methodIds = getMethodIds(dex, memberNameIndex, typeIndex);
fieldIds = getFieldIds(dex, memberNameIndex, typeIndex);
codeReader.setFieldVisitor(new CodeReader.Visitor() {
public void visit(DecodedInstruction[] all,
DecodedInstruction one) {
int fieldId = one.getIndex();
if (fieldIds.contains(fieldId)) {
out.println(location() + ": field reference ("
+ OpcodeInfo.getName(one.getOpcode()) + ")");
}
}
});
codeReader.setMethodVisitor(new CodeReader.Visitor() {
public void visit(DecodedInstruction[] all,
DecodedInstruction one) {
int methodId = one.getIndex();
if (methodIds.contains(methodId)) {
out.println(location() + ": method reference ("
+ OpcodeInfo.getName(one.getOpcode()) + ")");
}
}
});
}
private String location() {
String className = dex.typeNames().get(currentClass.getTypeIndex());
if (currentMethod != null) {
MethodId methodId = dex.methodIds().get(currentMethod.getMethodIndex());
return className + "." + dex.strings().get(methodId.getNameIndex());
} else {
return className;
}
}
/**
* Prints usages to out.
*/
public void findUsages() {
if (fieldIds == null || methodIds == null) {
return;
}
for (ClassDef classDef : dex.classDefs()) {
currentClass = classDef;
currentMethod = null;
if (classDef.getClassDataOffset() == 0) {
continue;
}
ClassData classData = dex.readClassData(classDef);
for (ClassData.Field field : classData.allFields()) {
if (fieldIds.contains(field.getFieldIndex())) {
out.println(location() + " field declared");
}
}
for (ClassData.Method method : classData.allMethods()) {
currentMethod = method;
if (methodIds.contains(method.getMethodIndex())) {
out.println(location() + " method declared");
}
if (method.getCodeOffset() != 0) {
codeReader.visitAll(dex.readCode(method).getInstructions());
}
}
}
currentClass = null;
currentMethod = null;
}
/**
* Returns the fields with {@code memberNameIndex} declared by {@code
* declaringType}.
*/
private Set<Integer> getFieldIds(DexBuffer dex, int memberNameIndex, int declaringType) {
Set<Integer> fields = new HashSet<Integer>();
int fieldIndex = 0;
for (FieldId fieldId : dex.fieldIds()) {
if (fieldId.getNameIndex() == memberNameIndex
&& declaringType == (int) fieldId.getDeclaringClassIndex()) {
fields.add(fieldIndex);
}
fieldIndex++;
}
return fields;
}
/**
* Returns the methods with {@code memberNameIndex} declared by {@code
* declaringType} and its subtypes.
*/
private Set<Integer> getMethodIds(DexBuffer dex, int memberNameIndex, int declaringType) {
Set<Integer> subtypes = findAssignableTypes(dex, declaringType);
Set<Integer> methods = new HashSet<Integer>();
int methodIndex = 0;
for (MethodId method : dex.methodIds()) {
if (method.getNameIndex() == memberNameIndex
&& subtypes.contains((int) method.getDeclaringClassIndex())) {
methods.add(methodIndex);
}
methodIndex++;
}
return methods;
}
/**
* Returns the set of types that can be assigned to {@code typeIndex}.
*/
private Set<Integer> findAssignableTypes(DexBuffer dex, int typeIndex) {
Set<Integer> assignableTypes = new HashSet<Integer>();
assignableTypes.add(typeIndex);
for (ClassDef classDef : dex.classDefs()) {
if (assignableTypes.contains(classDef.getSupertypeIndex())) {
assignableTypes.add(classDef.getTypeIndex());
continue;
}
for (int implemented : classDef.getInterfaces()) {
if (assignableTypes.contains(implemented)) {
assignableTypes.add(classDef.getTypeIndex());
break;
}
}
}
return assignableTypes;
}
}
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