Add methods to allow resuming execution after calling TerminateExecution().

src/isolate.cc

 // 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 1038 matching lines @@
   return Failure::Exception();
 }
 
 
 Failure* Isolate::TerminateExecution() {
   DoThrow(heap_.termination_exception(), NULL);
   return Failure::Exception();
 }
 
 
+void Isolate::CancelTerminateExecution() {
+  if (try_catch_handler()) {
+    try_catch_handler()->has_terminated_ = false;
+  }
+  if (has_pending_exception() &&
+      pending_exception() == heap_.termination_exception()) {
+    thread_local_top()->external_caught_exception_ = false;
+    clear_pending_exception();
+  }
+  if (has_scheduled_exception() &&
+      scheduled_exception() == heap_.termination_exception()) {
+    thread_local_top()->external_caught_exception_ = false;
+    clear_scheduled_exception();
+  }
+}
+
+
 Failure* Isolate::Throw(Object* exception, MessageLocation* location) {
   DoThrow(exception, location);
   return Failure::Exception();
 }
 
 
 Failure* Isolate::ReThrow(MaybeObject* exception) {
   bool can_be_caught_externally = false;
   bool catchable_by_javascript = is_catchable_by_javascript(exception);
   ShouldReportException(&can_be_caught_externally, catchable_by_javascript);
@@ skipping 879 matching lines @@
   bool external_caught = IsExternallyCaught();
   thread_local_top_.external_caught_exception_ = external_caught;
 
   if (!external_caught) return;
 
   if (thread_local_top_.pending_exception_->IsOutOfMemory()) {
     // Do not propagate OOM exception: we should kill VM asap.
   } else if (thread_local_top_.pending_exception_ ==
              heap()->termination_exception()) {
     try_catch_handler()->can_continue_ = false;
+    try_catch_handler()->has_terminated_ = true;
     try_catch_handler()->exception_ = heap()->null_value();
   } else {
     // At this point all non-object (failure) exceptions have
     // been dealt with so this shouldn't fail.
     ASSERT(!pending_exception()->IsFailure());
     try_catch_handler()->can_continue_ = true;
+    try_catch_handler()->has_terminated_ = false;
     try_catch_handler()->exception_ = pending_exception();
     if (!thread_local_top_.pending_message_obj_->IsTheHole()) {
       try_catch_handler()->message_ = thread_local_top_.pending_message_obj_;
     }
   }
 }
 
 
 void Isolate::InitializeLoggingAndCounters() {
   if (logger_ == NULL) {
@@ skipping 391 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal