/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.util.*;
import com.sun.tools.classfile.*;
import static com.sun.tools.classfile.ConstantPool.*;
import com.sun.tools.classfile.Instruction.TypeKind;
/**
* MethodFinder utility class to find references to the given methods.
*/
public abstract class MethodFinder {
final List<String> methods;
public MethodFinder(String... methods) {
this.methods = Arrays.asList(methods);
}
/**
* A callback method will be invoked when a method referencing
* any of the lookup methods.
*
* @param cf ClassFile
* @param m Method
* @param refs Set of constant pool indices that reference the methods
* matching the given lookup method names
*/
public abstract void referenceFound(ClassFile cf, Method m, Set<Integer> refs)
throws ConstantPoolException;
public String parse(ClassFile cf) throws ConstantPoolException {
List<Integer> cprefs = new ArrayList<Integer>();
int index = 1;
for (ConstantPool.CPInfo cpInfo : cf.constant_pool.entries()) {
if (cpInfo.accept(cpVisitor, null)) {
cprefs.add(index);
}
index += cpInfo.size();
}
if (!cprefs.isEmpty()) {
for (Method m : cf.methods) {
Set<Integer> refs = new HashSet<Integer>();
Code_attribute c_attr = (Code_attribute) m.attributes.get(Attribute.Code);
if (c_attr != null) {
for (Instruction instr : c_attr.getInstructions()) {
int idx = instr.accept(codeVisitor, cprefs);
if (idx > 0) {
refs.add(idx);
}
}
}
if (refs.size() > 0) {
referenceFound(cf, m, refs);
}
}
}
return cprefs.isEmpty() ? "" : cf.getName();
}
private ConstantPool.Visitor<Boolean,Void> cpVisitor =
new ConstantPool.Visitor<Boolean,Void>()
{
private boolean matches(CPRefInfo info) {
try {
CONSTANT_NameAndType_info nat = info.getNameAndTypeInfo();
return matches(info.getClassName(), nat.getName(), nat.getType());
} catch (ConstantPoolException ex) {
return false;
}
}
private boolean matches(String cn, String name, String type) {
return methods.contains(cn + "." + name);
}
public Boolean visitClass(CONSTANT_Class_info info, Void p) {
return false;
}
public Boolean visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
return matches(info);
}
public Boolean visitMethodref(CONSTANT_Methodref_info info, Void p) {
return matches(info);
}
public Boolean visitDouble(CONSTANT_Double_info info, Void p) {
return false;
}
public Boolean visitFieldref(CONSTANT_Fieldref_info info, Void p) {
return false;
}
public Boolean visitFloat(CONSTANT_Float_info info, Void p) {
return false;
}
public Boolean visitInteger(CONSTANT_Integer_info info, Void p) {
return false;
}
public Boolean visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) {
return false;
}
public Boolean visitLong(CONSTANT_Long_info info, Void p) {
return false;
}
public Boolean visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
return false;
}
public Boolean visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) {
return false;
}
public Boolean visitMethodType(CONSTANT_MethodType_info info, Void p) {
return false;
}
public Boolean visitString(CONSTANT_String_info info, Void p) {
return false;
}
public Boolean visitUtf8(CONSTANT_Utf8_info info, Void p) {
return false;
}
};
private Instruction.KindVisitor<Integer, List<Integer>> codeVisitor =
new Instruction.KindVisitor<Integer, List<Integer>>()
{
public Integer visitNoOperands(Instruction instr, List<Integer> p) {
return 0;
}
public Integer visitArrayType(Instruction instr, TypeKind kind, List<Integer> p) {
return 0;
}
public Integer visitBranch(Instruction instr, int offset, List<Integer> p) {
return 0;
}
public Integer visitConstantPoolRef(Instruction instr, int index, List<Integer> p) {
return p.contains(index) ? index : 0;
}
public Integer visitConstantPoolRefAndValue(Instruction instr, int index, int value, List<Integer> p) {
return p.contains(index) ? index : 0;
}
public Integer visitLocal(Instruction instr, int index, List<Integer> p) {
return 0;
}
public Integer visitLocalAndValue(Instruction instr, int index, int value, List<Integer> p) {
return 0;
}
public Integer visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, List<Integer> p) {
return 0;
}
public Integer visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, List<Integer> p) {
return 0;
}
public Integer visitValue(Instruction instr, int value, List<Integer> p) {
return 0;
}
public Integer visitUnknown(Instruction instr, List<Integer> p) {
return 0;
}
};
}