Hi Abdullah,
> InstructionList il = new InstructionList(); Method
> theOldConstructor = cg.containsMethod("<>", "()V"); MethodGen
> theNewConstructor = new MethodGen(Constants.ACC_PUBLIC,
> Type.VOID, Type.NO_ARGS, NO_STRINGS, "<init>",
> cg.getClassName(), il, cpg);
> il.append(ifact.createInvoke(cg.getSuperclassName(),
> "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
> il.append(InstructionConstants.RETURN);
> cg.replaceMethod(theOldConstructor,
> theNewConstructor.getMethod()); il.dispose(); cg.setConstantPool(cpg);
Wouldn't this just 'delete' the old constructor, and create a new 'default' one?
What misses is to move the code that's inside the old constructor into an
ordinairy method. What I came up with so far was to:
/* look up the default constructor */
Method constructor_method = getConstructors().get(0);
ConstantPoolGen cpgen = new ConstantPoolGen(jc.getConstantPool());
MethodGen constructor = new MethodGen(constructor_method, jc.getClassName(),
new ConstantPoolGen(jc.getConstantPool()));
InstructionList constructor_code = constructor.getInstructionList();
/* a new method. Later I'd need to find a unique name.. I also copy the
constructor's instruction list*/
MethodGen newmethod = new MethodGen(Constants.ACC_PUBLIC, Type.VOID, new Type[]
{}, new String[] {}, "xaxaxa", jc.getClassName(), constructor_code.copy() ,
cpgen);
InstructionHandle[] newmethod_instructions =
newmethod.getInstructionList().getInstructionHandles();
/* remove the first two instructions (the one that loads the object variable
this,
And the invocation of the super-constructor... */
try {
newmethod.getInstructionList().delete(newmethod_instructions[0],
newmethod_instructions[1]);
} catch (TargetLostException e) {
/* not only the target is lost here.. But me too.. :-)
e.printStackTrace();
}
... Now I'd probably need to handle
* local variables
* exception handlers
..
What I don't really pick up is the instruction target exceptions (which in fact
get thrown by several LineNumberGen's in my tests..)
Felix
---------------------------------------------------------------------
To unsubscribe, e-mail: bcel-user-unsubscr...@jakarta.apache.org
For additional commands, e-mail: bcel-user-h...@jakarta.apache.org
