Hi all,
I'm trying to insert some code in the constructor of certain classes. The code should
be getting the current singleton instance of a class 'MySingleton' and call a method
'myMethod' on this instance. My code is as follows :
InstructionList il = mg.getInstructionList();
il.insert(factory.createInvoke("MySingleTon", "getInstance", new
ObjectType("MySingleton"), Type.NO_ARGS, Constants.INVOKESTATIC));
il.insert(InstructionFactory.createLoad(Type.OBJECT, 0));
il.insert(factory.createInvoke("java.lang.Object", "getClass", new
ObjectType("java.lang.Class"), Type.NO_ARGS, Constants.INVOKEVIRTUAL));
il.insert(factory.createInvoke("java.lang.Class", "getName", Type.STRING,
Type.NO_ARGS, Constants.INVOKEVIRTUAL));
il.insert(InstructionConstants.ACONST_NULL);
il.insert(factory.createInvoke("MySingleton", "myMethod", Type.VOID, new Type[] {
Type.STRING, new ObjectType("MyObject") }, Constants.INVOKEVIRTUAL));
mg.setInstructionList(il);
mg.setMaxStack();
When I decompile the patched class the method to which I inserted the code has
dissapeared and the following line is added in place :
// JavaClassFileOutputException: Stack underflow
Does anybody has an idea of what I'm doing wrong? Can you provide me a code sample
doing something like I want to achieve?
Kind regards,
Johan,
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