Add a ResourceConstraint for the embedder to specify that V8 is running on a memory constrained dev…

include/v8.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 3740 matching lines @@
   ResourceConstraints();
   int max_young_space_size() const { return max_young_space_size_; }
   void set_max_young_space_size(int value) { max_young_space_size_ = value; }
   int max_old_space_size() const { return max_old_space_size_; }
   void set_max_old_space_size(int value) { max_old_space_size_ = value; }
   int max_executable_size() { return max_executable_size_; }
   void set_max_executable_size(int value) { max_executable_size_ = value; }
   uint32_t* stack_limit() const { return stack_limit_; }
   // Sets an address beyond which the VM's stack may not grow.
   void set_stack_limit(uint32_t* value) { stack_limit_ = value; }
+  Maybe<bool> is_memory_constrained() const { return is_memory_constrained_; }
+  // If set to true, V8 will limit it's memory usage, at the potential cost of
+  // lower performance.  Note, this option is a tentative addition to the API
+  // and may be removed or modified without warning.
+  void set_memory_constrained(bool value) {
+    is_memory_constrained_ = Maybe<bool>(value);
+  }
+
  private:
   int max_young_space_size_;
   int max_old_space_size_;
   int max_executable_size_;
   uint32_t* stack_limit_;
+  Maybe<bool> is_memory_constrained_;
 };
 
 
 bool V8_EXPORT SetResourceConstraints(ResourceConstraints* constraints);
 
 
 // --- Exceptions ---
 
 
 typedef void (*FatalErrorCallback)(const char* location, const char* message);
@@ skipping 2661 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_