/**
* Remove the local variable type table attribute (LVTT) from mg. Evidently some changes require
* this to be updated, but without BCEL support that would be hard to do. It should be safe to
* just delete it since it is optional and really only of use to a debugger.
*/
public static void remove_local_variable_type_tables(MethodGen mg) {
for (Attribute a : mg.getCodeAttributes()) {
if (is_local_variable_type_table(a, mg.getConstantPool())) {
mg.removeCodeAttribute(a);
}
}
}
/**
* Processes each method in cg replacing any specified calls with static user calls.
*
* @param fullClassName must be packageName.className
*/
private boolean map_calls(ClassGen cg, String fullClassName, ClassLoader loader) {
boolean transformed = false;
try {
pgen = cg.getConstantPool();
// Loop through each method in the class
Method[] methods = cg.getMethods();
for (int i = 0; i < methods.length; i++) {
MethodGen mg = new MethodGen(methods[i], cg.getClassName(), pgen);
// Get the instruction list and skip methods with no instructions
InstructionList il = mg.getInstructionList();
if (il == null) continue;
if (debug) out.format("Original code: %s%n", mg.getMethod().getCode());
instrument_method(methods[i], mg);
// Remove the Local variable type table attribute (if any).
// Evidently, some changes we make require this to be updated, but
// without BCEL support, that would be hard to do. Just delete it
// for now (since it is optional, and we are unlikely to be used by
// a debugger)
for (Attribute a : mg.getCodeAttributes()) {
if (is_local_variable_type_table(a)) {
mg.removeCodeAttribute(a);
}
}
// Update the instruction list
mg.setInstructionList(il);
mg.update();
// Update the max stack and Max Locals
mg.setMaxLocals();
mg.setMaxStack();
mg.update();
// Update the method in the class
cg.replaceMethod(methods[i], mg.getMethod());
if (debug) out.format("Modified code: %s%n", mg.getMethod().getCode());
// verify the new method
// StackVer stackver = new StackVer();
// VerificationResult vr = stackver.do_stack_ver (mg);
// log ("vr for method %s = %s%n", mg.getName(), vr);
// if (vr.getStatus() != VerificationResult.VERIFIED_OK) {
// System.out.printf ("Warning BCEL Verify failed for method %s: %s",
// mg.getName(), vr);
// System.out.printf ("Code: %n%s%n", mg.getMethod().getCode());
// System.exit(1);
// }
}
cg.update();
} catch (Exception e) {
out.format("Unexpected exception encountered: " + e);
e.printStackTrace();
}
return transformed;
}