Bytecodes::Code
VMEvent::get_verifier_breakpoint_opcode(const Method* this_method, int bci) {
UsingFastOops fast_oops;
InstanceClass::Fast cl;
// We may get called from Method::check_bytecodes() and the holder
// hasn't been set yet. Check for 0xFFFF class id which is illegal
if (this_method->holder_id() == 0xFFFF) {
// No class has been set yet, just return the breakpoint opcode
return Bytecodes::_breakpoint;
}
cl = this_method->holder(); /* point to class of method */
// We may get called during GC when stackmaps are generated and we are
// iterating over bytecodes. So, we can't allocate.
VMEvent::Raw ep =
find_breakpoint_event(JavaDebugger::get_object_id_by_ref(&cl),
JavaDebugger::get_method_id(this_method),
(jlong)bci, -1);
if (ep.is_null()) {
return Bytecodes::_illegal;
}
LocationModifier::Raw location = get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
GUARANTEE(!location.is_null(), "No location modifier for event");
return(location().save_opcode());
}
void VMEvent::clear_event_request(VMEvent *ep)
{
LocationModifier::Raw mod;
Thread::Raw thread;
VMEvent::remove_event_request(ep);
#ifdef AZZERT
if (TraceDebugger) {
tty->print_cr("VMEvent: clear 0x%x, id 0x%x", (int)ep->obj(), ep->event_id());
}
#endif
switch (ep->event_kind()) {
case JDWP_EventKind_BREAKPOINT:
mod = get_modifier(ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
GUARANTEE(!mod.is_null(), "No location modifier for breakpoint event");
if (!mod.is_null()) {
#if ENABLE_ISOLATES
// See if any other task already has a breakpoint here.
VMEvent::Raw epb = find_breakpoint_event(&mod);
if (!epb.is_null()) {
// Has to be some other task since we have unlinked this event
GUARANTEE(epb().task_id() != ep->task_id(),
"Duplicate breakpoint event for this task");
} else {
#endif
mod().set_method_opcode(mod().save_opcode(), false);
#if ENABLE_ISOLATES
}
#endif
}
break;
case JDWP_EventKind_SINGLE_STEP:
mod = get_modifier(ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_Step);
if (mod.not_null()) {
thread = JavaDebugger::get_thread_by_id(mod().thread_id());
if (thread.not_null())
thread().set_is_stepping(false);
JavaDebugger::set_stepping(false);
}
break;
}
// see if there are any other breakpoints in this method. If no other
// breakpoints and the compiler is active then clear the
// impossible_to_compile flag.
if (mod.not_null() && (ep->event_kind() == JDWP_EventKind_BREAKPOINT ||
ep->event_kind() == JDWP_EventKind_SINGLE_STEP)) {
clear_impossible_to_compile(&mod, ep);
}
}
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);
}
}
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;
}
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;
}
ReturnOop VMEvent::find_breakpoint_event(int class_id, jlong method_id,
jlong offset, int task_id)
{
// May be called during GC via GenerateStackMap::run().
VMEventStream es;
VMEvent::Raw ep;
LocationModifier::Raw loc;
while (!es.at_end()) {
ep = es.next_by_kind(JDWP_EventKind_BREAKPOINT);
if (ep.is_null()) {
return NULL;
}
#if ENABLE_ISOLATES
// If task_id == -1 && ep.task_id == -1 then we don't care
// which task this is we check the event otherwise we skip it
if (task_id != -1 && ep().task_id() != -1 &&
(ep().task_id() != task_id)) {
continue;
}
#else
(void)task_id;
#endif
loc = get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
if (loc.not_null()) {
if (loc().clazz_id() == class_id &&
loc().method_id() == method_id &&
loc().offset() == offset) {
return ep;
}
}
}
return (ReturnOop)NULL;
}
void VMEvent::replace_event_opcode(Method *method, Bytecodes::Code bcode,
int bci)
{
UsingFastOops fast_oops;
InstanceClass::Fast clazz = method->holder();
// find this breakpoint
VMEvent::Raw ep =
find_breakpoint_event(JavaDebugger::get_object_id_by_ref(&clazz),
JavaDebugger::get_method_id(method),
(jlong)bci, -1);
if (ep.is_null()) {
// if we didn't find the breakpoint event, then just replace the bytecode
method->bytecode_at_put_raw(bci, bcode);
} else {
// Set the saved opcode to the new fast opcode
LocationModifier::Raw location = get_modifier(&ep,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
GUARANTEE(!location.is_null(), "No location modifier for event");
location().set_save_opcode(bcode);
}
return;
}