expose AssertNoAllocation to api

src/heap.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 1458 matching lines @@
   // Given an address occupied by a live code object, return that object.
   Object* FindCodeObject(Address a);
 
   enum HeapState { NOT_IN_GC, SCAVENGE, MARK_COMPACT };
   inline HeapState gc_state() { return gc_state_; }
 
   inline bool IsInGCPostProcessing() { return gc_post_processing_depth_ > 0; }
 
 #ifdef DEBUG
   bool IsAllocationAllowed() { return allocation_allowed_; }
+  inline void set_allow_allocation(bool allocation_allowed);
   inline bool allow_allocation(bool enable);
 
   bool disallow_allocation_failure() {
     return disallow_allocation_failure_;
   }
 
   void TracePathToObjectFrom(Object* target, Object* root);
   void TracePathToObject(Object* target);
   void TracePathToGlobal();
 #endif
@@ skipping 1195 matching lines @@
 };
 
 
 // A helper class to document/test C++ scopes where we do not
 // expect a GC. Usage:
 //
 // /* Allocation not allowed: we cannot handle a GC in this scope. */
 // { AssertNoAllocation nogc;
 //   ...
 // }
+
+#ifdef DEBUG
+inline bool EnterAllocationScope(Isolate* isolate, bool allow_allocation);
+inline void ExitAllocationScope(Isolate* isolate, bool last_state);
+#endif
+
+
 class AssertNoAllocation {
  public:
   inline AssertNoAllocation();
   inline ~AssertNoAllocation();
 
 #ifdef DEBUG
  private:
-  bool old_state_;
-  bool active_;
+  bool last_state_;
 #endif
 };
 
 
 class DisableAssertNoAllocation {
  public:
   inline DisableAssertNoAllocation();
   inline ~DisableAssertNoAllocation();
 
 #ifdef DEBUG
  private:
-  bool old_state_;
-  bool active_;
+  bool last_state_;
 #endif
 };
 
 // GCTracer collects and prints ONE line after each garbage collector
 // invocation IFF --trace_gc is used.
 
 class GCTracer BASE_EMBEDDED {
  public:
   class Scope BASE_EMBEDDED {
    public:
@@ skipping 336 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_