ReturnOop LocationModifier::get_dup_rom_method(Method *in_rom_method) {
VMEventStream es;
VMEvent::Raw ep;
LocationModifier::Raw mod;
Method::Raw sm;
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
while(!ep.is_null()) {
mod = VMEvent::get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
if (!mod.is_null()) {
sm = mod().method();
if (!sm.is_null() && sm.obj() == in_rom_method->obj()) {
return mod().rom_debug_method();
}
}
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
}
return NULL;
}
void LocationModifier::find_and_set_rom_method_id(Method *debug_rom_method) {
VMEventStream es;
VMEvent::Raw ep;
LocationModifier::Raw mod;
Method::Raw dm;
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
while(!ep.is_null()) {
mod = VMEvent::get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
if (!mod.is_null()) {
dm = mod().rom_debug_method();
if (!dm.is_null() && dm.obj() == debug_rom_method->obj()) {
set_method_id(mod().method_id());
break;
}
}
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
}
}
address get_rom_debug_method(Thread *thread, OopDesc *md) {
(void)thread; // always passed from interpreter but not used here.
VMEventStream es;
Method::Raw m = md;
VMEvent::Raw ep;
LocationModifier::Raw mod;
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
while(!ep.is_null()) {
mod = VMEvent::get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
if (!mod.is_null() &&
mod().method_id() == JavaDebugger::get_method_id(&m)) {
Method::Raw dm = mod().rom_debug_method();
if (!dm.is_null()) {
return (address)((char *)dm.obj());
}
}
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
}
return (address)md;
}
void handle_single_step(Thread *thread)
{
UsingFastOops fast_oops;
julong offset;
bool sendEvent = false;
/* if the proxy has returned -1 it means that we have reached
* the end of a function and we must look up stack for the
* calling function
*
*/
JavaFrame frame(thread);
GUARANTEE(frame.is_java_frame(), "single step not in JavaFrame!");
#if !ENABLE_ROM_JAVA_DEBUGGER
// Don't allow step events if we are in a ROM method
GUARANTEE(UseROM, "Sanity");
Method::Raw m = frame.method();
if (ROM::in_any_loaded_bundle(m.obj())) {
return;
}
#endif
offset = frame.bci();
StepModifier::Fast sm = thread->step_info();
if (sm.is_null()) {
// Huh? this can't be. Turn off single stepping for this thread
thread->set_is_stepping(false);
return;
}
address starting_fp = DERIVED(address, sm().step_starting_fp(),
thread->stack_base());
if (sm().step_target_offset() == -1) {
/*
* Wait for the frame to change and that will mean we popped up to
* the calling frame. (Or we called down to another frame, maybe...
* should look into that possibility)
*/
if (starting_fp != frame.fp()) {
sendEvent = true;
/* the frame has changed but we don't know whether we
* have gone into a function or gone up one.
* if we look up the call stack and find the frame
* that originally set the request then we stepped
* into a function, otherwise we stepped out
*/
if (sm().step_depth() == JDWP_StepDepth_OVER ||
sm().step_depth() == JDWP_StepDepth_OUT) {
if (StepModifier::find_frame(starting_fp, &frame)) {
sendEvent = false;
}
}
}
} else {
switch (sm().step_size()) {
case JDWP_StepSize_LINE:
/* stepping by line can have two effects: we stay in the same
* frame or the frame changes
*/
if (starting_fp == frame.fp()) {
/* if the frame is the same and we are not running to the
* end of a function we need to see if we have reached
* the location we are looking for
*/
if (sm().step_depth() != JDWP_StepDepth_OUT) {
if (offset == sm().step_target_offset()) {
/* we reached the exact offset we were looking for */
sendEvent = true;
break;
} else if (offset < sm().step_starting_offset()) {
/* we ended up before the offset were the stepping
* request was initiated. we jumped back
*/
sendEvent = true;
break;
} else if (offset > sm().step_target_offset() &&
offset > sm().step_starting_offset()) {
if (sm().dup_current_line_offset() == -1) {
/* We stepped beyond the target and there's no
* duplicate offset information
* (like there would be in a for or while loop).
* Most likely a break in a switch case.
* However, we checked to see if our starting offset
* is equal to our current, if so don't issue
* an event otherwise we'll be in an infinite loop.
*/
sendEvent = true;
break;
} else if (offset >= sm().dup_current_line_offset()) {
/*
* We are after the location we were looking for;
* we jumped forward. However, we may be at the end
* of a for/while loop where we do the loop
* test. We check to see if we are in the line after
* the for/do end line. If not, we just continue.
*/
if (sm().post_dup_line_offset() != -1) {
/*
* There is a line after the duplicate line
* so check to see if we've past it. If
* post_dup_line_offset == -1 then there is no line
* after the duplicate so we continue until we
* either jump back or return from this method
*/
if (offset >= sm().post_dup_line_offset()) {
/* we were beyond the end of the loop */
sendEvent = true;
break;
}
}
}
}
}
} else {
/* the frame has changed but we don't know whether we
* have gone into a function or gone up one.
* if we look up the call stack and find the frame
* that originally set the request then we stepped
* into a function, otherwise we stepped out
*/
sendEvent = true;
if (sm().step_depth() == JDWP_StepDepth_OVER ||
sm().step_depth() == JDWP_StepDepth_OUT) {
if (StepModifier::find_frame(starting_fp, &frame)) {
sendEvent = false;
}
}
}
break;
/* stepping by bytecode */
case JDWP_StepSize_MIN:
if (sm().step_depth() == JDWP_StepDepth_OVER) {
// if we are stepping by bytecode then if we are in the
// same frame as we started in, send the event.
// if we are not in the same frame then see if we are deeper in the
// call stack. If so then don't send the event since we are in
// Step Over mode.
if (starting_fp == frame.fp()) {
sendEvent = true;
} else {
sendEvent = true;
/* If we are deeper in the call stack do not break... */
if (StepModifier::find_frame(starting_fp, &frame)) {
sendEvent = false;
}
}
} else if (sm().step_depth() == JDWP_StepDepth_OUT) {
// in this case, we want to send the event only if we've popped
// up one frame (i.e. to the caller of the starting frame)
if (starting_fp != frame.fp()) {
sendEvent = true;
/* If we are deeper in the call stack do not break... */
if (StepModifier::find_frame(starting_fp, &frame)) {
sendEvent = false;
}
}
} else {
sendEvent = true;
}
break;
}
}
if (sendEvent) {
UsingFastOops fast_oops_2;
Method::Fast m = frame.method();
InstanceClass::Fast ic = m().holder();
if (m().bytecode_at_raw(frame.bci()) == Bytecodes::_breakpoint) {
// Don't single step into a breakpoint
return;
}
if (JavaDebugger::get_method_id(&ic, &m) == -1) {
// Most likely this method was removed from the ROM because the
// ROM was built without MakeROMDebuggable. There's no sense in
// sending an event since we can't identify the method to the
// debugger
return;
}
DebuggerEvent d_event(JDWP_EventKind_SINGLE_STEP,
JavaDebugger::get_thread_id_by_ref(Thread::current()),
JavaDebugger::get_object_id_by_ref(&ic),
JavaDebugger::get_method_id(&ic, &m),
(jlong)frame.bci());
d_event.set_step_size(sm().step_size());
d_event.set_step_depth(sm().step_depth());
VMEvent::send_event(&d_event);
return;
} else {
return;
}
}
