Simplify pending message object handling.

src/isolate.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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include "include/v8-debug.h"
 #include "src/allocation.h"
@@ skipping 264 matching lines @@
   Object* pending_exception_;
 
   // Communication channel between Isolate::FindHandler and the CEntryStub.
   Context* pending_handler_context_;
   Code* pending_handler_code_;
   intptr_t pending_handler_offset_;
   Address pending_handler_fp_;
   Address pending_handler_sp_;
 
   // Communication channel between Isolate::Throw and message consumers.
-  bool has_pending_message_;
   bool rethrowing_message_;
   Object* pending_message_obj_;
 
   // Use a separate value for scheduled exceptions to preserve the
   // invariants that hold about pending_exception.  We may want to
   // unify them later.
   Object* scheduled_exception_;
   bool external_caught_exception_;
   SaveContext* save_context_;
 
@@ skipping 301 matching lines @@
 
   THREAD_LOCAL_TOP_ADDRESS(Context*, pending_handler_context)
   THREAD_LOCAL_TOP_ADDRESS(Code*, pending_handler_code)
   THREAD_LOCAL_TOP_ADDRESS(intptr_t, pending_handler_offset)
   THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_fp)
   THREAD_LOCAL_TOP_ADDRESS(Address, pending_handler_sp)
 
   THREAD_LOCAL_TOP_ACCESSOR(bool, external_caught_exception)
 
   void clear_pending_message() {
-    thread_local_top_.has_pending_message_ = false;
     thread_local_top_.pending_message_obj_ = heap_.the_hole_value();
   }
   v8::TryCatch* try_catch_handler() {
     return thread_local_top_.try_catch_handler();
   }
   Address try_catch_handler_address() {
     return thread_local_top_.try_catch_handler_address();
   }
   bool* external_caught_exception_address() {
     return &thread_local_top_.external_caught_exception_;
   }
 
   THREAD_LOCAL_TOP_ADDRESS(Object*, scheduled_exception)
 
   Address pending_message_obj_address() {
     return reinterpret_cast<Address>(&thread_local_top_.pending_message_obj_);
   }
 
-  Address has_pending_message_address() {
-    return reinterpret_cast<Address>(&thread_local_top_.has_pending_message_);
-  }
-
   Object* scheduled_exception() {
     DCHECK(has_scheduled_exception());
     DCHECK(!thread_local_top_.scheduled_exception_->IsException());
     return thread_local_top_.scheduled_exception_;
   }
   bool has_scheduled_exception() {
     DCHECK(!thread_local_top_.scheduled_exception_->IsException());
     return thread_local_top_.scheduled_exception_ != heap_.the_hole_value();
   }
   void clear_scheduled_exception() {
@@ skipping 937 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_