Check for GC interrupt in JSON parser.

src/execution.h

 // Copyright 2014 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_EXECUTION_H_
 #define V8_EXECUTION_H_
 
 #include "src/handles.h"
 
 namespace v8 {
@@ skipping 179 matching lines @@
     return reinterpret_cast<Address>(&thread_local_.jslimit_);
   }
   Address address_of_real_jslimit() {
     return reinterpret_cast<Address>(&thread_local_.real_jslimit_);
   }
 
   // If the stack guard is triggered, but it is not an actual
   // stack overflow, then handle the interruption accordingly.
   Object* HandleInterrupts();
 
+  bool InterruptRequested() { return GetCurrentStackPosition() < climit(); }
+
+  void CheckAndHandleGCInterrupt();
+
  private:
   StackGuard();
 
   bool CheckInterrupt(InterruptFlag flag);
   void RequestInterrupt(InterruptFlag flag);
   void ClearInterrupt(InterruptFlag flag);
   bool CheckAndClearInterrupt(InterruptFlag flag);
 
   // You should hold the ExecutionAccess lock when calling this method.
   bool has_pending_interrupts(const ExecutionAccess& lock) {
@@ skipping 58 matching lines @@
   friend class Isolate;
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_