Add memory pressure interrupt for memory pressure notification

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/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/handles.h"
@@ skipping 68 matching lines @@
   char* RestoreStackGuard(char* from);
   static int ArchiveSpacePerThread() { return sizeof(ThreadLocal); }
   void FreeThreadResources();
   // Sets up the default stack guard for this thread if it has not
   // already been set up.
   void InitThread(const ExecutionAccess& lock);
   // Clears the stack guard for this thread so it does not look as if
   // it has been set up.
   void ClearThread(const ExecutionAccess& lock);
 
-#define INTERRUPT_LIST(V)                                          \
-  V(DEBUGBREAK, DebugBreak, 0)                                     \
-  V(DEBUGCOMMAND, DebugCommand, 1)                                 \
-  V(TERMINATE_EXECUTION, TerminateExecution, 2)                    \
-  V(GC_REQUEST, GC, 3)                                             \
-  V(INSTALL_CODE, InstallCode, 4)                                  \
-  V(API_INTERRUPT, ApiInterrupt, 5)                                \
-  V(DEOPT_MARKED_ALLOCATION_SITES, DeoptMarkedAllocationSites, 6)
+#define INTERRUPT_LIST(V)                                         \
+  V(DEBUGBREAK, DebugBreak, 0)                                    \
+  V(DEBUGCOMMAND, DebugCommand, 1)                                \
+  V(TERMINATE_EXECUTION, TerminateExecution, 2)                   \
+  V(GC_REQUEST, GC, 3)                                            \
+  V(INSTALL_CODE, InstallCode, 4)                                 \
+  V(API_INTERRUPT, ApiInterrupt, 5)                               \
+  V(DEOPT_MARKED_ALLOCATION_SITES, DeoptMarkedAllocationSites, 6) \
+  V(MEMORY_PRESSURE_INTERRUPT, MemoryPressureInterrupt, 7)
 
 #define V(NAME, Name, id)                                          \
   inline bool Check##Name() { return CheckInterrupt(NAME); }  \
   inline void Request##Name() { RequestInterrupt(NAME); }     \
   inline void Clear##Name() { ClearInterrupt(NAME); }
   INTERRUPT_LIST(V)
 #undef V
 
   // Flag used to set the interrupt causes.
   enum InterruptFlag {
@@ skipping 21 matching lines @@
   }
   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();
   void HandleGCInterrupt();
 
+  bool NeedMemoryPressureGC();
+  void MemoryPressureGCDone();
+
  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 77 matching lines @@
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_EXECUTION_H_