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;
}
void VMEvent::create_event_request(PacketInputStream *in,
PacketOutputStream *out, jbyte event_kind)
{
UsingFastOops fast_oops;
VMEvent::Fast ep;
int i;
bool error = false;
VMEventModifier::Fast current_modifier_slot, new_modifier, event_modifier;
ep = create_vm_event_request();
ep().set_event_kind(event_kind);
ep().set_suspend_policy(in->read_byte());
ep().set_num_modifiers(in->read_int());
Transport *transport = in->transport();
ep().set_transport(transport);
#if ENABLE_ISOLATES
ep().set_task_id(transport->task_id());
TaskGCContext tmp(transport->task_id());
#endif
for (i=0; i < ep().num_modifiers(); i++) {
new_modifier = VMEventModifier::new_modifier(in, out, error);
if (error) {
// some sort of error happened
if (out->error() != 0) {
out->send_packet();
}
return;
}
if (new_modifier.is_null()) {
// Most likely we don't support this modifier
continue;
}
if (event_kind == JDWP_EventKind_BREAKPOINT &&
new_modifier().mod_kind() ==
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly) {
UsingFastOops fastoops2;
LocationModifier *lmp = (LocationModifier *)&new_modifier;
VMEvent::Fast epb = VMEvent::find_breakpoint_event(lmp,
transport->task_id());
if (epb.not_null()) {
out->write_int(epb().event_id());
out->send_packet();
// out->send_error(JDWP_Error_NOT_IMPLEMENTED);
// there's a breakpoint here already, don't bother installing another
return;
}
#if ENABLE_ISOLATES
InstanceClass::Raw ic = JavaDebugger::get_object_by_id(new_modifier().clazz_id());
if (ic().class_id() < ROM::number_of_system_classes()) {
// breakpoint in system class, allow in any task
ep().set_task_id(-1);
}
// See if any other task already has a breakpoint here.
epb = find_breakpoint_event(lmp);
if (!epb.is_null()) {
// Has to be some other task since we haven't linked in this event
GUARANTEE(epb().task_id() != transport->task_id(),
"Breakpoint already inserted");
LocationModifier::Raw lmod = get_modifier(&epb,
JDWP_EventRequest_Set_Out_modifiers_Modifier_LocationOnly);
GUARANTEE(!lmod.is_null(),"Breakpoint event has no location modifier");
lmp->set_save_opcode(lmod().save_opcode());
} else {
#endif
/* Return an error back to the debugger if
* the breakpoint could not be installed.
*/
lmp->unlink_method();
lmp->save_method_entry();
if (lmp->set_method_opcode(Bytecodes::_breakpoint, true) ==
false){
out->send_error(JDWP_Error_INVALID_LOCATION);
return;
}
#if ENABLE_ISOLATES
}
#endif
}
// insert the mod at the end of the list of modifiers
event_modifier = ep().mods();
if (event_modifier.is_null()) {
ep().set_mods(&new_modifier);
current_modifier_slot = ep().mods();
} else {
current_modifier_slot().set_next(&new_modifier);
current_modifier_slot = new_modifier;
}
}
#ifdef AZZERT
if (TraceDebugger) {
tty->print_cr("Create Event: xprt = 0x%x, ep = 0x%lx, id = 0x%x, kind = 0x%lx, suspend = 0x%lx, num mods = 0x%lx",
transport->obj(),
ep.obj(),
ep().event_id(),
ep().event_kind(),
ep().suspend_policy(),
ep().num_modifiers());
}
#endif
ep().set_next((VMEvent *)Universe::vmevent_request_head());
*Universe::vmevent_request_head() = ep;
out->write_int(ep().event_id());
out->send_packet();
VMEvent::add_notification(JDWP_eventkind_to_dbg_eventkind(event_kind));
}