/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2007 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.gwt.dev.asm.commons;
import com.google.gwt.dev.asm.Label;
import com.google.gwt.dev.asm.MethodVisitor;
import com.google.gwt.dev.asm.Opcodes;
import com.google.gwt.dev.asm.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A {@link com.google.gwt.dev.asm.MethodAdapter} to insert before, after and around
* advices in methods and constructors. <p> The behavior for constructors is
* like this: <ol>
*
* <li>as long as the INVOKESPECIAL for the object initialization has not been
* reached, every bytecode instruction is dispatched in the ctor code visitor</li>
*
* <li>when this one is reached, it is only added in the ctor code visitor and
* a JP invoke is added</li>
*
* <li>after that, only the other code visitor receives the instructions</li>
*
* </ol>
*
* @author Eugene Kuleshov
* @author Eric Bruneton
*/
public abstract class AdviceAdapter extends GeneratorAdapter implements Opcodes
{
private static final Object THIS = new Object();
private static final Object OTHER = new Object();
protected int methodAccess;
protected String methodDesc;
private boolean constructor;
private boolean superInitialized;
private List stackFrame;
private Map branches;
/**
* Creates a new {@link AdviceAdapter}.
*
* @param mv the method visitor to which this adapter delegates calls.
* @param access the method's access flags (see {@link Opcodes}).
* @param name the method's name.
* @param desc the method's descriptor (see {@link Type Type}).
*/
protected AdviceAdapter(
final MethodVisitor mv,
final int access,
final String name,
final String desc)
{
super(mv, access, name, desc);
methodAccess = access;
methodDesc = desc;
constructor = "<init>".equals(name);
}
public void visitCode() {
mv.visitCode();
if (constructor) {
stackFrame = new ArrayList();
branches = new HashMap();
} else {
superInitialized = true;
onMethodEnter();
}
}
public void visitLabel(final Label label) {
mv.visitLabel(label);
if (constructor && branches != null) {
List frame = (List) branches.get(label);
if (frame != null) {
stackFrame = frame;
branches.remove(label);
}
}
}
public void visitInsn(final int opcode) {
if (constructor) {
int s;
switch (opcode) {
case RETURN: // empty stack
onMethodExit(opcode);
break;
case IRETURN: // 1 before n/a after
case FRETURN: // 1 before n/a after
case ARETURN: // 1 before n/a after
case ATHROW: // 1 before n/a after
popValue();
onMethodExit(opcode);
break;
case LRETURN: // 2 before n/a after
case DRETURN: // 2 before n/a after
popValue();
popValue();
onMethodExit(opcode);
break;
case NOP:
case LALOAD: // remove 2 add 2
case DALOAD: // remove 2 add 2
case LNEG:
case DNEG:
case FNEG:
case INEG:
case L2D:
case D2L:
case F2I:
case I2B:
case I2C:
case I2S:
case I2F:
case ARRAYLENGTH:
break;
case ACONST_NULL:
case ICONST_M1:
case ICONST_0:
case ICONST_1:
case ICONST_2:
case ICONST_3:
case ICONST_4:
case ICONST_5:
case FCONST_0:
case FCONST_1:
case FCONST_2:
case F2L: // 1 before 2 after
case F2D:
case I2L:
case I2D:
pushValue(OTHER);
break;
case LCONST_0:
case LCONST_1:
case DCONST_0:
case DCONST_1:
pushValue(OTHER);
pushValue(OTHER);
break;
case IALOAD: // remove 2 add 1
case FALOAD: // remove 2 add 1
case AALOAD: // remove 2 add 1
case BALOAD: // remove 2 add 1
case CALOAD: // remove 2 add 1
case SALOAD: // remove 2 add 1
case POP:
case IADD:
case FADD:
case ISUB:
case LSHL: // 3 before 2 after
case LSHR: // 3 before 2 after
case LUSHR: // 3 before 2 after
case L2I: // 2 before 1 after
case L2F: // 2 before 1 after
case D2I: // 2 before 1 after
case D2F: // 2 before 1 after
case FSUB:
case FMUL:
case FDIV:
case FREM:
case FCMPL: // 2 before 1 after
case FCMPG: // 2 before 1 after
case IMUL:
case IDIV:
case IREM:
case ISHL:
case ISHR:
case IUSHR:
case IAND:
case IOR:
case IXOR:
case MONITORENTER:
case MONITOREXIT:
popValue();
break;
case POP2:
case LSUB:
case LMUL:
case LDIV:
case LREM:
case LADD:
case LAND:
case LOR:
case LXOR:
case DADD:
case DMUL:
case DSUB:
case DDIV:
case DREM:
popValue();
popValue();
break;
case IASTORE:
case FASTORE:
case AASTORE:
case BASTORE:
case CASTORE:
case SASTORE:
case LCMP: // 4 before 1 after
case DCMPL:
case DCMPG:
popValue();
popValue();
popValue();
break;
case LASTORE:
case DASTORE:
popValue();
popValue();
popValue();
popValue();
break;
case DUP:
pushValue(peekValue());
break;
case DUP_X1:
s = stackFrame.size();
stackFrame.add(s - 2, stackFrame.get(s - 1));
break;
case DUP_X2:
s = stackFrame.size();
stackFrame.add(s - 3, stackFrame.get(s - 1));
break;
case DUP2:
s = stackFrame.size();
stackFrame.add(s - 2, stackFrame.get(s - 1));
stackFrame.add(s - 2, stackFrame.get(s - 1));
break;
case DUP2_X1:
s = stackFrame.size();
stackFrame.add(s - 3, stackFrame.get(s - 1));
stackFrame.add(s - 3, stackFrame.get(s - 1));
break;
case DUP2_X2:
s = stackFrame.size();
stackFrame.add(s - 4, stackFrame.get(s - 1));
stackFrame.add(s - 4, stackFrame.get(s - 1));
break;
case SWAP:
s = stackFrame.size();
stackFrame.add(s - 2, stackFrame.get(s - 1));
stackFrame.remove(s);
break;
}
} else {
switch (opcode) {
case RETURN:
case IRETURN:
case FRETURN:
case ARETURN:
case LRETURN:
case DRETURN:
case ATHROW:
onMethodExit(opcode);
break;
}
}
mv.visitInsn(opcode);
}
public void visitVarInsn(final int opcode, final int var) {
super.visitVarInsn(opcode, var);
if (constructor) {
switch (opcode) {
case ILOAD:
case FLOAD:
pushValue(OTHER);
break;
case LLOAD:
case DLOAD:
pushValue(OTHER);
pushValue(OTHER);
break;
case ALOAD:
pushValue(var == 0 ? THIS : OTHER);
break;
case ASTORE:
case ISTORE:
case FSTORE:
popValue();
break;
case LSTORE:
case DSTORE:
popValue();
popValue();
break;
}
}
}
public void visitFieldInsn(
final int opcode,
final String owner,
final String name,
final String desc)
{
mv.visitFieldInsn(opcode, owner, name, desc);
if (constructor) {
char c = desc.charAt(0);
boolean longOrDouble = c == 'J' || c == 'D';
switch (opcode) {
case GETSTATIC:
pushValue(OTHER);
if (longOrDouble) {
pushValue(OTHER);
}
break;
case PUTSTATIC:
popValue();
if (longOrDouble) {
popValue();
}
break;
case PUTFIELD:
popValue();
if (longOrDouble) {
popValue();
popValue();
}
break;
// case GETFIELD:
default:
if (longOrDouble) {
pushValue(OTHER);
}
}
}
}
public void visitIntInsn(final int opcode, final int operand) {
mv.visitIntInsn(opcode, operand);
if (constructor && opcode!=NEWARRAY) {
pushValue(OTHER);
}
}
public void visitLdcInsn(final Object cst) {
mv.visitLdcInsn(cst);
if (constructor) {
pushValue(OTHER);
if (cst instanceof Double || cst instanceof Long) {
pushValue(OTHER);
}
}
}
public void visitMultiANewArrayInsn(final String desc, final int dims) {
mv.visitMultiANewArrayInsn(desc, dims);
if (constructor) {
for (int i = 0; i < dims; i++) {
popValue();
}
pushValue(OTHER);
}
}
public void visitTypeInsn(final int opcode, final String type) {
mv.visitTypeInsn(opcode, type);
// ANEWARRAY, CHECKCAST or INSTANCEOF don't change stack
if (constructor && opcode == NEW) {
pushValue(OTHER);
}
}
public void visitMethodInsn(
final int opcode,
final String owner,
final String name,
final String desc)
{
mv.visitMethodInsn(opcode, owner, name, desc);
if (constructor) {
Type[] types = Type.getArgumentTypes(desc);
for (int i = 0; i < types.length; i++) {
popValue();
if (types[i].getSize() == 2) {
popValue();
}
}
switch (opcode) {
// case INVOKESTATIC:
// break;
case INVOKEINTERFACE:
case INVOKEVIRTUAL:
popValue(); // objectref
break;
case INVOKESPECIAL:
Object type = popValue(); // objectref
if (type == THIS && !superInitialized) {
onMethodEnter();
superInitialized = true;
// once super has been initialized it is no longer
// necessary to keep track of stack state
constructor = false;
}
break;
}
Type returnType = Type.getReturnType(desc);
if (returnType != Type.VOID_TYPE) {
pushValue(OTHER);
if (returnType.getSize() == 2) {
pushValue(OTHER);
}
}
}
}
public void visitJumpInsn(final int opcode, final Label label) {
mv.visitJumpInsn(opcode, label);
if (constructor) {
switch (opcode) {
case IFEQ:
case IFNE:
case IFLT:
case IFGE:
case IFGT:
case IFLE:
case IFNULL:
case IFNONNULL:
popValue();
break;
case IF_ICMPEQ:
case IF_ICMPNE:
case IF_ICMPLT:
case IF_ICMPGE:
case IF_ICMPGT:
case IF_ICMPLE:
case IF_ACMPEQ:
case IF_ACMPNE:
popValue();
popValue();
break;
case JSR:
pushValue(OTHER);
break;
}
addBranch(label);
}
}
public void visitLookupSwitchInsn(
final Label dflt,
final int[] keys,
final Label[] labels)
{
mv.visitLookupSwitchInsn(dflt, keys, labels);
if (constructor) {
popValue();
addBranches(dflt, labels);
}
}
public void visitTableSwitchInsn(
final int min,
final int max,
final Label dflt,
final Label[] labels)
{
mv.visitTableSwitchInsn(min, max, dflt, labels);
if (constructor) {
popValue();
addBranches(dflt, labels);
}
}
private void addBranches(final Label dflt, final Label[] labels) {
addBranch(dflt);
for (int i = 0; i < labels.length; i++) {
addBranch(labels[i]);
}
}
private void addBranch(final Label label) {
if (branches.containsKey(label)) {
return;
}
branches.put(label, new ArrayList(stackFrame));
}
private Object popValue() {
return stackFrame.remove(stackFrame.size() - 1);
}
private Object peekValue() {
return stackFrame.get(stackFrame.size() - 1);
}
private void pushValue(final Object o) {
stackFrame.add(o);
}
/**
* Called at the beginning of the method or after super class class call in
* the constructor. <br><br>
*
* <i>Custom code can use or change all the local variables, but should not
* change state of the stack.</i>
*/
protected void onMethodEnter() {
}
/**
* Called before explicit exit from the method using either return or throw.
* Top element on the stack contains the return value or exception instance.
* For example:
*
* <pre>
* public void onMethodExit(int opcode) {
* if(opcode==RETURN) {
* visitInsn(ACONST_NULL);
* } else if(opcode==ARETURN || opcode==ATHROW) {
* dup();
* } else {
* if(opcode==LRETURN || opcode==DRETURN) {
* dup2();
* } else {
* dup();
* }
* box(Type.getReturnType(this.methodDesc));
* }
* visitIntInsn(SIPUSH, opcode);
* visitMethodInsn(INVOKESTATIC, owner, "onExit", "(Ljava/lang/Object;I)V");
* }
*
* // an actual call back method
* public static void onExit(int opcode, Object param) {
* ...
* </pre>
*
* <br><br>
*
* <i>Custom code can use or change all the local variables, but should not
* change state of the stack.</i>
*
* @param opcode one of the RETURN, IRETURN, FRETURN, ARETURN, LRETURN,
* DRETURN or ATHROW
*
*/
protected void onMethodExit(int opcode) {
}
// TODO onException, onMethodCall
}