Basic implementation of incremental marking.

src/execution.h

 // Copyright 2006-2008 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 21 matching lines @@
 namespace internal {
 
 
 // Flag used to set the interrupt causes.
 enum InterruptFlag {
   INTERRUPT = 1 << 0,
   DEBUGBREAK = 1 << 1,
   DEBUGCOMMAND = 1 << 2,
   PREEMPT = 1 << 3,
   TERMINATE = 1 << 4,
-  RUNTIME_PROFILER_TICK = 1 << 5
+  RUNTIME_PROFILER_TICK = 1 << 5,
+  GC_REQUEST = 1 << 6
 };
 
 class Execution : public AllStatic {
  public:
   // Call a function, the caller supplies a receiver and an array
   // of arguments. Arguments are Object* type. After function returns,
   // pointers in 'args' might be invalid.
   //
   // *pending_exception tells whether the invoke resulted in
   // a pending exception.
@@ skipping 124 matching lines @@
   static bool IsTerminateExecution();
   static void TerminateExecution();
   static bool IsRuntimeProfilerTick();
   static void RequestRuntimeProfilerTick();
 #ifdef ENABLE_DEBUGGER_SUPPORT
   static bool IsDebugBreak();
   static void DebugBreak();
   static bool IsDebugCommand();
   static void DebugCommand();
 #endif
+  static bool IsGCRequest();
+  static void RequestGC();
   static void Continue(InterruptFlag after_what);
 
   // This provides an asynchronous read of the stack limits for the current
   // thread.  There are no locks protecting this, but it is assumed that you
   // have the global V8 lock if you are using multiple V8 threads.
   static uintptr_t climit() {
     return thread_local_.climit_;
   }
   static uintptr_t real_climit() {
     return thread_local_.real_climit_;
@@ skipping 116 matching lines @@
   ~PostponeInterruptsScope() {
     if (--StackGuard::thread_local_.postpone_interrupts_nesting_ == 0) {
       StackGuard::EnableInterrupts();
     }
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_