I'm trying to get the target of a branch instruction, but it always gives me
a null
instruction handle. The code is very simple:
int fnd = (-1);
JavaClass clazz = Repository.lookupClass("test");
Method[] methods = clazz.getMethods();
// find method "hello"
for(int i = 0;i < methods.length;i++) {
System.out.println("Method[" + i + "] = " + methods[i]);
String s = methods[i].getName();
System.out.println("Name is " + s);
if ( s.equals("hello") ) fnd = i;
}
if ( fnd >= 0 ) {
ConstantPool cp = clazz.getConstantPool();
methods[fnd].setConstantPool(cp); // try setting constant pool
Code c = methods[fnd].getCode();
c.setConstantPool(cp); // try again
byte[] b = c.getCode();
InstructionList il = new InstructionList(b);
il.setPositions(true);
Instruction ii[] = il.getInstructions();
for(int w=0;w<ii.length;w++) {
System.out.println("Instruction[" + w + "] = " + ii[w]);
if ( ii[w] instanceof BranchInstruction ) {
InstructionHandle ih =
((BranchInstruction)(ii[w])).getTarget();
if ( ih != null )
System.out.println(" Branch " + ih.getPosition());
}
}
}
and yet it fails every time. Clearly I am doing something wrong. Can someone
please
give me a clue?
Thanks,
Mark
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