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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode.stackmap;
import javassist.bytecode.*;
public class TypedBlock extends BasicBlock {
public int stackTop, numLocals;
// localsTypes is set to non-null when this block is first visited by a MapMaker.
// see alreadySet().
public TypeData[] localsTypes;
public TypeData[] stackTypes;
/**
* Divides the method body into basic blocks.
* The type information of the first block is initialized.
*
* @param optimize if it is true and the method does not include
* branches, this method returns null.
*/
public static TypedBlock[] makeBlocks(MethodInfo minfo, CodeAttribute ca,
boolean optimize)
throws BadBytecode
{
TypedBlock[] blocks = (TypedBlock[])new Maker().make(minfo);
if (optimize && blocks.length < 2)
if (blocks.length == 0 || blocks[0].incoming == 0)
return null;
ConstPool pool = minfo.getConstPool();
boolean isStatic = (minfo.getAccessFlags() & AccessFlag.STATIC) != 0;
blocks[0].initFirstBlock(ca.getMaxStack(), ca.getMaxLocals(),
pool.getClassName(), minfo.getDescriptor(),
isStatic, minfo.isConstructor());
return blocks;
}
protected TypedBlock(int pos) {
super(pos);
localsTypes = null;
}
protected void toString2(StringBuffer sbuf) {
super.toString2(sbuf);
sbuf.append(",\n stack={");
printTypes(sbuf, stackTop, stackTypes);
sbuf.append("}, locals={");
printTypes(sbuf, numLocals, localsTypes);
sbuf.append('}');
}
private void printTypes(StringBuffer sbuf, int size,
TypeData[] types) {
if (types == null)
return;
for (int i = 0; i < size; i++) {
if (i > 0)
sbuf.append(", ");
TypeData td = types[i];
sbuf.append(td == null ? "<>" : td.toString());
}
}
public boolean alreadySet() {
return localsTypes != null;
}
public void setStackMap(int st, TypeData[] stack, int nl, TypeData[] locals)
throws BadBytecode
{
stackTop = st;
stackTypes = stack;
numLocals = nl;
localsTypes = locals;
}
/*
* Computes the correct value of numLocals.
*/
public void resetNumLocals() {
if (localsTypes != null) {
int nl = localsTypes.length;
while (nl > 0 && localsTypes[nl - 1].isBasicType() == TypeTag.TOP) {
if (nl > 1) {
if (localsTypes[nl - 2].is2WordType())
break;
}
--nl;
}
numLocals = nl;
}
}
public static class Maker extends BasicBlock.Maker {
protected BasicBlock makeBlock(int pos) {
return new TypedBlock(pos);
}
protected BasicBlock[] makeArray(int size) {
return new TypedBlock[size];
}
}
/**
* Initializes the first block by the given method descriptor.
*
* @param block the first basic block that this method initializes.
* @param className a dot-separated fully qualified class name.
* For example, javassist.bytecode.stackmap.BasicBlock.
* @param methodDesc method descriptor.
* @param isStatic true if the method is a static method.
* @param isConstructor true if the method is a constructor.
*/
void initFirstBlock(int maxStack, int maxLocals, String className,
String methodDesc, boolean isStatic, boolean isConstructor)
throws BadBytecode
{
if (methodDesc.charAt(0) != '(')
throw new BadBytecode("no method descriptor: " + methodDesc);
stackTop = 0;
stackTypes = TypeData.make(maxStack);
TypeData[] locals = TypeData.make(maxLocals);
if (isConstructor)
locals[0] = new TypeData.UninitThis(className);
else if (!isStatic)
locals[0] = new TypeData.ClassName(className);
int n = isStatic ? -1 : 0;
int i = 1;
try {
while ((i = descToTag(methodDesc, i, ++n, locals)) > 0)
if (locals[n].is2WordType())
locals[++n] = TypeTag.TOP;
}
catch (StringIndexOutOfBoundsException e) {
throw new BadBytecode("bad method descriptor: "
+ methodDesc);
}
numLocals = n;
localsTypes = locals;
}
private static int descToTag(String desc, int i,
int n, TypeData[] types)
throws BadBytecode
{
int i0 = i;
int arrayDim = 0;
char c = desc.charAt(i);
if (c == ')')
return 0;
while (c == '[') {
++arrayDim;
c = desc.charAt(++i);
}
if (c == 'L') {
int i2 = desc.indexOf(';', ++i);
if (arrayDim > 0)
types[n] = new TypeData.ClassName(desc.substring(i0, ++i2));
else
types[n] = new TypeData.ClassName(desc.substring(i0 + 1, ++i2 - 1)
.replace('/', '.'));
return i2;
}
else if (arrayDim > 0) {
types[n] = new TypeData.ClassName(desc.substring(i0, ++i));
return i;
}
else {
TypeData t = toPrimitiveTag(c);
if (t == null)
throw new BadBytecode("bad method descriptor: " + desc);
types[n] = t;
return i + 1;
}
}
private static TypeData toPrimitiveTag(char c) {
switch (c) {
case 'Z' :
case 'C' :
case 'B' :
case 'S' :
case 'I' :
return TypeTag.INTEGER;
case 'J' :
return TypeTag.LONG;
case 'F' :
return TypeTag.FLOAT;
case 'D' :
return TypeTag.DOUBLE;
case 'V' :
default :
return null;
}
}
public static String getRetType(String desc) {
int i = desc.indexOf(')');
if (i < 0)
return "java.lang.Object";
char c = desc.charAt(i + 1);
if (c == '[')
return desc.substring(i + 1);
else if (c == 'L')
return desc.substring(i + 2, desc.length() - 1).replace('/', '.');
else
return "java.lang.Object";
}
}
