Introduce exception object and remove some uses of MaybeObject::IsFailure().

src/isolate.h

 // Copyright 2012 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 570 matching lines @@
   Context** context_address() { return &thread_local_top_.context_; }
 
   THREAD_LOCAL_TOP_ACCESSOR(SaveContext*, save_context)
 
   // Access to current thread id.
   THREAD_LOCAL_TOP_ACCESSOR(ThreadId, thread_id)
 
   // Interface to pending exception.
   Object* pending_exception() {
     ASSERT(has_pending_exception());
-    ASSERT(!thread_local_top_.pending_exception_->IsFailure());
+    ASSERT(!thread_local_top_.pending_exception_->IsException());
     return thread_local_top_.pending_exception_;
   }
 
-  void set_pending_exception(Object* exception) {
-    ASSERT(!exception->IsFailure());
-    thread_local_top_.pending_exception_ = exception;
+  void set_pending_exception(Object* exception_obj) {
+    ASSERT(!exception_obj->IsException());
+    thread_local_top_.pending_exception_ = exception_obj;
   }
 
   void clear_pending_exception() {
-    ASSERT(!thread_local_top_.pending_exception_->IsFailure());
+    ASSERT(!thread_local_top_.pending_exception_->IsException());
     thread_local_top_.pending_exception_ = heap_.the_hole_value();
   }
 
   Object** pending_exception_address() {
     return &thread_local_top_.pending_exception_;
   }
 
   bool has_pending_exception() {
-    ASSERT(!thread_local_top_.pending_exception_->IsFailure());
+    ASSERT(!thread_local_top_.pending_exception_->IsException());
     return !thread_local_top_.pending_exception_->IsTheHole();
   }
 
   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();
     thread_local_top_.pending_message_script_ = heap_.the_hole_value();
   }
@@ skipping 21 matching lines @@
     return reinterpret_cast<Address>(&thread_local_top_.has_pending_message_);
   }
 
   Address pending_message_script_address() {
     return reinterpret_cast<Address>(
         &thread_local_top_.pending_message_script_);
   }
 
   Object* scheduled_exception() {
     ASSERT(has_scheduled_exception());
-    ASSERT(!thread_local_top_.scheduled_exception_->IsFailure());
+    ASSERT(!thread_local_top_.scheduled_exception_->IsException());
     return thread_local_top_.scheduled_exception_;
   }
   bool has_scheduled_exception() {
-    ASSERT(!thread_local_top_.scheduled_exception_->IsFailure());
+    ASSERT(!thread_local_top_.scheduled_exception_->IsException());
     return thread_local_top_.scheduled_exception_ != heap_.the_hole_value();
   }
   void clear_scheduled_exception() {
-    ASSERT(!thread_local_top_.scheduled_exception_->IsFailure());
+    ASSERT(!thread_local_top_.scheduled_exception_->IsException());
     thread_local_top_.scheduled_exception_ = heap_.the_hole_value();
   }
 
   bool IsExternallyCaught();
 
   bool is_catchable_by_javascript(Object* exception) {
     return exception != heap()->termination_exception();
   }
 
   // Serializer.
@@ skipping 873 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_