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

src/execution.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 402 matching lines @@
   set_interrupt_limits(access);
 }
 
 
 bool StackGuard::IsTerminateExecution() {
   ExecutionAccess access(isolate_);
   return (thread_local_.interrupt_flags_ & TERMINATE) != 0;
 }
 
 
+void StackGuard::ResumeExecution() {
+  ASSERT(thread_local_.interrupt_flags_ & TERMINATE);
+  ExecutionAccess access(isolate_);
+  thread_local_.interrupt_flags_ &= ~static_cast<int>(TERMINATE);

[Yang, 2012/12/07 15:03:48]

If I'm not mistaken, this is already being done in Execution::HandleStackGuard.
An ASSERT would be enough.

+  if (!should_postpone_interrupts(access) && !has_pending_interrupts(access)) {
+    reset_limits(access);
+  }
+  isolate_->ResumeExecution();
+}
+
+
 void StackGuard::TerminateExecution() {
   ExecutionAccess access(isolate_);
   thread_local_.interrupt_flags_ |= TERMINATE;
   set_interrupt_limits(access);
 }
 
 
 bool StackGuard::IsRuntimeProfilerTick() {
   ExecutionAccess access(isolate_);
   return (thread_local_.interrupt_flags_ & RUNTIME_PROFILER_TICK) != 0;
@@ skipping 528 matching lines @@
   }
   if (stack_guard->IsInterrupted()) {
     stack_guard->Continue(INTERRUPT);
     return isolate->StackOverflow();
   }
   return isolate->heap()->undefined_value();
 }
 
 
 } }  // namespace v8::internal