Handle thread preemption in debugger

test/cctest/test-debug.cc

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 493 matching lines @@
 // Global variable to store the last function hit - used by some tests.
 char last_function_hit[80];
 
 // Debug event handler which counts the break points which have been hit.
 int break_point_hit_count = 0;
 static void DebugEventBreakPointHitCount(v8::DebugEvent event,
                                          v8::Handle<v8::Object> exec_state,
                                          v8::Handle<v8::Object> event_data,
                                          v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   // Count the number of breaks.
   if (event == v8::Break) {
     break_point_hit_count++;
     if (!frame_function_name.IsEmpty()) {
       // Get the name of the function.
       const int argc = 1;
       v8::Handle<v8::Value> argv[argc] = { exec_state };
       v8::Handle<v8::Value> result = frame_function_name->Call(exec_state,
                                                                argc, argv);
@@ skipping 19 matching lines @@
   break_point_hit_count = 0;
   exception_hit_count = 0;
   uncaught_exception_hit_count = 0;
 }
 
 static void DebugEventCounter(v8::DebugEvent event,
                               v8::Handle<v8::Object> exec_state,
                               v8::Handle<v8::Object> event_data,
                               v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   // Count the number of breaks.
   if (event == v8::Break) {
     break_point_hit_count++;
   } else if (event == v8::Exception) {
     exception_hit_count++;
 
     // Check whether the exception was uncaught.
     v8::Local<v8::String> fun_name = v8::String::New("uncaught");
     v8::Local<v8::Function> fun =
@@ skipping 37 matching lines @@
     "  return exec_state.frame(0).evaluate(expr).value() === expected;"
     "}";
 v8::Local<v8::Function> evaluate_check_function;
 
 // The actual debug event described by the longer comment above.
 static void DebugEventEvaluate(v8::DebugEvent event,
                                v8::Handle<v8::Object> exec_state,
                                v8::Handle<v8::Object> event_data,
                                v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   if (event == v8::Break) {
     for (int i = 0; checks[i].expr != NULL; i++) {
       const int argc = 3;
       v8::Handle<v8::Value> argv[argc] = { exec_state,
                                            v8::String::New(checks[i].expr),
                                            checks[i].expected };
       v8::Handle<v8::Value> result =
           evaluate_check_function->Call(exec_state, argc, argv);
       if (!result->IsTrue()) {
         v8::String::AsciiValue ascii(checks[i].expected->ToString());
         V8_Fatal(__FILE__, __LINE__, "%s != %s", checks[i].expr, *ascii);
       }
     }
   }
 }
 
 
 // This debug event listener removes a breakpoint in a function
 int debug_event_remove_break_point = 0;
 static void DebugEventRemoveBreakPoint(v8::DebugEvent event,
                                        v8::Handle<v8::Object> exec_state,
                                        v8::Handle<v8::Object> event_data,
                                        v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   if (event == v8::Break) {
     break_point_hit_count++;
     v8::Handle<v8::Function> fun = v8::Handle<v8::Function>::Cast(data);
     ClearBreakPoint(debug_event_remove_break_point);
   }
 }
 
 
 // Debug event handler which counts break points hit and performs a step
 // afterwards.
 StepAction step_action = StepIn;  // Step action to perform when stepping.
 static void DebugEventStep(v8::DebugEvent event,
                            v8::Handle<v8::Object> exec_state,
                            v8::Handle<v8::Object> event_data,
                            v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   if (event == v8::Break) {
     break_point_hit_count++;
     PrepareStep(step_action);
   }
 }
 
 
 // Debug event handler which counts break points hit and performs a step
 // afterwards. For each call the expected function is checked.
 // For this debug event handler to work the following two global varaibles
 // must be initialized.
 //   expected_step_sequence: An array of the expected function call sequence.
 //   frame_function_name: A JavaScript function (see below).
 
 // String containing the expected function call sequence. Note: this only works
 // if functions have name length of one.
 const char* expected_step_sequence = NULL;
 
 // The actual debug event described by the longer comment above.
 static void DebugEventStepSequence(v8::DebugEvent event,
                                    v8::Handle<v8::Object> exec_state,
                                    v8::Handle<v8::Object> event_data,
                                    v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   if (event == v8::Break || event == v8::Exception) {
     // Check that the current function is the expected.
     CHECK(break_point_hit_count <
           static_cast<int>(strlen(expected_step_sequence)));
     const int argc = 1;
     v8::Handle<v8::Value> argv[argc] = { exec_state };
     v8::Handle<v8::Value> result = frame_function_name->Call(exec_state,
                                                              argc, argv);
     CHECK(result->IsString());
     v8::String::AsciiValue function_name(result->ToString());
     CHECK_EQ(1, strlen(*function_name));
     CHECK_EQ((*function_name)[0],
               expected_step_sequence[break_point_hit_count]);
 
     // Perform step.
     break_point_hit_count++;
     PrepareStep(step_action);
   }
 }
 
 
 // Debug event handler which performs a garbage collection.
 static void DebugEventBreakPointCollectGarbage(
     v8::DebugEvent event,
     v8::Handle<v8::Object> exec_state,
     v8::Handle<v8::Object> event_data,
     v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   // Perform a garbage collection when break point is hit and continue. Based
   // on the number of break points hit either scavenge or mark compact
   // collector is used.
   if (event == v8::Break) {
     break_point_hit_count++;
     if (break_point_hit_count % 2 == 0) {
       // Scavenge.
       Heap::CollectGarbage(0, v8::internal::NEW_SPACE);
     } else {
       // Mark sweep (and perhaps compact).
       Heap::CollectAllGarbage();
     }
   }
 }
 
 
 // Debug event handler which re-issues a debug break and calls the garbage
 // collector to have the heap verified.
 static void DebugEventBreak(v8::DebugEvent event,
                             v8::Handle<v8::Object> exec_state,
                             v8::Handle<v8::Object> event_data,
                             v8::Handle<v8::Value> data) {
   // When hitting a debug event listener there must be a break set.
-  CHECK(v8::internal::Top::is_break());
+  CHECK(v8::internal::Debug::break_id() != 0);
 
   if (event == v8::Break) {
     // Count the number of breaks.
     break_point_hit_count++;
 
     // Run the garbage collector to enforce heap verification if option
     // --verify-heap is set.
     Heap::CollectGarbage(0, v8::internal::NEW_SPACE);
 
     // Set the break flag again to come back here as soon as possible.
@@ skipping 2940 matching lines @@
 
   // Fill a host dispatch and a continue command on the command queue before
   // generating a debug break.
   v8::Debug::SendHostDispatch(NULL);
   v8::Debug::SendCommand(buffer, AsciiToUtf16(command_continue, buffer));
   CompileRun("debugger");
 
   // The host dispatch callback should be called.
   CHECK_EQ(1, host_dispatch_hit_count);
 }
-