Trigger exception debug events on Promise reject.

src/debug.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_H_
 #define V8_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 317 matching lines @@
  private:
   Logger* logger_;
   CommandMessageQueue queue_;
   mutable base::Mutex mutex_;
   DISALLOW_COPY_AND_ASSIGN(LockingCommandMessageQueue);
 };
 
 
 class PromiseOnStack {
  public:
-  PromiseOnStack(Isolate* isolate,
-                 PromiseOnStack* prev,
-                 Handle<JSFunction> getter);
+  PromiseOnStack(Isolate* isolate, PromiseOnStack* prev,
+                 Handle<JSObject> getter);
   ~PromiseOnStack();
   StackHandler* handler() { return handler_; }
-  Handle<JSFunction> getter() { return getter_; }
+  Handle<JSObject> promise() { return promise_; }
   PromiseOnStack* prev() { return prev_; }
  private:
   Isolate* isolate_;
   StackHandler* handler_;
-  Handle<JSFunction> getter_;
+  Handle<JSObject> promise_;
   PromiseOnStack* prev_;
 };
 
 
 // This class contains the debugger support. The main purpose is to handle
 // setting break points in the code.
 //
 // This class controls the debug info for all functions which currently have
 // active breakpoints in them. This debug info is held in the heap root object
 // debug_info which is a FixedArray. Each entry in this list is of class
 // DebugInfo.
 class Debug {
  public:
   // Debug event triggers.
   void OnDebugBreak(Handle<Object> break_points_hit, bool auto_continue);
-  void OnException(Handle<Object> exception, bool uncaught);
+
+  void OnThrow(Handle<Object> exception, bool uncaught);
+  void OnPromiseReject(Handle<JSObject> promise, Handle<Object> value);
   void OnCompileError(Handle<Script> script);
   void OnBeforeCompile(Handle<Script> script);
   void OnAfterCompile(Handle<Script> script);
   void OnPromiseEvent(Handle<JSObject> data);
   void OnAsyncTaskEvent(Handle<JSObject> data);
 
   // API facing.
   void SetEventListener(Handle<Object> callback, Handle<Object> data);
   void SetMessageHandler(v8::Debug::MessageHandler handler);
   void EnqueueCommandMessage(Vector<const uint16_t> command,
@@ skipping 70 matching lines @@
       Handle<SharedFunctionInfo> shared,
       BreakPositionAlignment position_aligment);
 
   // Check whether a global object is the debug global object.
   bool IsDebugGlobal(GlobalObject* global);
 
   // Check whether this frame is just about to return.
   bool IsBreakAtReturn(JavaScriptFrame* frame);
 
   // Promise handling.
-  void PromiseHandlePrologue(Handle<JSFunction> promise_getter);
-  void PromiseHandleEpilogue();
+  // Push and pop a promise and the current try-catch handler.
+  void PushPromise(Handle<JSObject> promise);
+  void PopPromise();
 
   // Support for LiveEdit
   void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
                              LiveEdit::FrameDropMode mode,
                              Object** restarter_frame_function_pointer);
 
   // Passed to MakeWeak.
   static void HandleWeakDebugInfo(
       const v8::WeakCallbackData<v8::Value, void>& data);
 
@@ skipping 49 matching lines @@
   void UpdateState();
   void Unload();
   void SetNextBreakId() {
     thread_local_.break_id_ = ++thread_local_.break_count_;
   }
 
   // Check whether there are commands in the command queue.
   inline bool has_commands() const { return !command_queue_.IsEmpty(); }
   inline bool ignore_events() const { return is_suppressed_ || !is_active_; }
 
+  void OnException(Handle<Object> exception, bool uncaught,
+                   Handle<Object> promise);
+
   // Constructors for debug event objects.
   MUST_USE_RESULT MaybeHandle<Object> MakeJSObject(
       const char* constructor_name,
       int argc,
       Handle<Object> argv[]);
   MUST_USE_RESULT MaybeHandle<Object> MakeExecutionState();
   MUST_USE_RESULT MaybeHandle<Object> MakeBreakEvent(
       Handle<Object> break_points_hit);
   MUST_USE_RESULT MaybeHandle<Object> MakeExceptionEvent(
       Handle<Object> exception,
       bool uncaught,
       Handle<Object> promise);
   MUST_USE_RESULT MaybeHandle<Object> MakeCompileEvent(
       Handle<Script> script, v8::DebugEvent type);
   MUST_USE_RESULT MaybeHandle<Object> MakePromiseEvent(
       Handle<JSObject> promise_event);
   MUST_USE_RESULT MaybeHandle<Object> MakeAsyncTaskEvent(
       Handle<JSObject> task_event);
 
   // Mirror cache handling.
   void ClearMirrorCache();
 
-  // Returns a promise if it does not have a reject handler.
-  Handle<Object> GetPromiseForUncaughtException();
+  // Returns a promise if the pushed try-catch handler matches the current one.
+  Handle<Object> GetPromiseOnStackOnThrow();
+  bool PromiseHasRejectHandler(Handle<JSObject> promise);
 
   void CallEventCallback(v8::DebugEvent event,
                          Handle<Object> exec_state,
                          Handle<Object> event_data,
                          v8::Debug::ClientData* client_data);
   void ProcessDebugEvent(v8::DebugEvent event,
                          Handle<JSObject> event_data,
                          bool auto_continue);
   void NotifyMessageHandler(v8::DebugEvent event,
                             Handle<JSObject> exec_state,
@@ skipping 201 matching lines @@
   // several frames above.
   // There is no calling conventions here, because it never actually gets
   // called, it only gets returned to.
   static void GenerateFrameDropperLiveEdit(MacroAssembler* masm);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEBUG_H_