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/*
* Copyright 2010 Google Inc.
*
* 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.googlecode.gwt.test.internal.rewrite;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import java.util.HashMap;
import java.util.Map;
/**
* A general Class Visitor which will take any of the method calls in it's list and replace them
* with static calls to another method (the "mirrored" method) in another class (the "mirrored"
* class). This method should take the original object as it's first argument, followed by the rest
* of the arguments to the method. The "mirrored" class will not be rewritten, allowing the
* "mirrored" method to do whatever modifications are necessary before calling the original method
* (if desired). Methods which should be rewritten are listed in the mirroredMethods map below. Note
* that our mirroring process is not robust enough to rewrite methods on subtypes.
*/
public class UseMirroredClasses extends ClassVisitor {
private static class MethodInterceptor extends MethodVisitor {
private static HashMap> mirrorMap;
static {
// The list of mirrored methods
// TODO(unnurg): Find a better way to track methods that will get
// rewritten - possibly by using annotations
mirrorMap = new HashMap>();
HashMap logRecordMethods = new HashMap();
logRecordMethods.put("getLoggerName",
"com/google/gwt/logging/impl/DevModeLoggingFixes:getLoggerName");
mirrorMap.put("java/util/logging/LogRecord", logRecordMethods);
HashMap logManagerMethods = new HashMap();
logManagerMethods.put("getLogger",
"com/google/gwt/logging/impl/DevModeLoggingFixes:logManagerGetLogger");
logManagerMethods.put("getLoggerNames",
"com/google/gwt/logging/impl/DevModeLoggingFixes:logManagerGetLoggerNames");
mirrorMap.put("java/util/logging/LogManager", logManagerMethods);
HashMap loggerMethods = new HashMap();
loggerMethods.put("getName", "com/google/gwt/logging/impl/DevModeLoggingFixes:getName");
loggerMethods.put("getLogger",
"com/google/gwt/logging/impl/DevModeLoggingFixes:loggerGetLogger");
mirrorMap.put("java/util/logging/Logger", loggerMethods);
}
private String className;
protected MethodInterceptor(MethodVisitor mv, String className) {
super(Opcodes.ASM4, mv);
this.className = className;
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc) {
// Check if this method is in our list
Map mirroredMethods = mirrorMap.get(owner);
if (mirroredMethods == null) {
super.visitMethodInsn(opcode, owner, name, desc);
return;
}
String mirrorClassMethod = mirroredMethods.get(name);
if (mirrorClassMethod == null) {
super.visitMethodInsn(opcode, owner, name, desc);
return;
}
// Confirm that the replacement method string is correctly formatted
// and split it into a class and a method
String[] temp = mirrorClassMethod.split(":");
if (temp.length < 2) {
super.visitMethodInsn(opcode, owner, name, desc);
return;
}
String mirrorClass = temp[0];
String mirrorMethod = temp[1];
// Confirm that this is not the mirrored class itself (this would
// lead to infinite loops if the mirrored method wants to call
// the original method in it's implementation).
if (className.equals(mirrorClass.replace("/", "."))) {
super.visitMethodInsn(opcode, owner, name, desc);
return;
}
if (opcode == Opcodes.INVOKESTATIC) {
super.visitMethodInsn(opcode, mirrorClass, mirrorMethod, desc);
return;
}
// Get the types of the current method being invoked
// using the method descriptor string
final Type[] argTypes = Type.getArgumentTypes(desc);
// The new types for the new method
final Type[] newArgTypes = new Type[argTypes.length + 1];
// Make the first argument be the instance type (i.e. "this")
newArgTypes[0] = Type.getType("L" + owner + ";");
// Copy over all the other args
System.arraycopy(argTypes, 0, newArgTypes, 1, argTypes.length);
// Specify the new descriptor that includes the "this" arg.
String newDesc = Type.getMethodDescriptor(Type.getReturnType(desc), newArgTypes);
// Call the corresponding static method on the mirror class
super.visitMethodInsn(Opcodes.INVOKESTATIC, mirrorClass, mirrorMethod, newDesc);
return;
}
}
private String className;
public UseMirroredClasses(ClassVisitor cv, String className) {
super(Opcodes.ASM4, cv);
this.className = className;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature,
String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
if (mv == null) {
return null;
}
return new MethodInterceptor(mv, className);
}
}
