Remove SafePointBarrier

third_party/WebKit/Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 1107 matching lines @@
 
   // 256 is as good an approximation as any else.
   const size_t bytesToCopy = sizeof(Address) * 256;
   if (static_cast<size_t>(start - end) < bytesToCopy)
     return start;
 
   return end + bytesToCopy;
 }
 #endif
 
+// TODO(haraken): The first void* pointer is unused. Remove it.
+using PushAllRegistersCallback = void (*)(void*, ThreadState*, intptr_t*);
+extern "C" void pushAllRegisters(void*, ThreadState*, PushAllRegistersCallback);
+
+static void enterSafePointAfterPushRegisters(void*,
+                                             ThreadState* state,
+                                             intptr_t* stackEnd) {
+  state->recordStackEnd(stackEnd);
+  state->copyStackUntilSafePointScope();
+}
+
 void ThreadState::enterSafePoint(BlinkGC::StackState stackState,
                                  void* scopeMarker) {
   ASSERT(checkThread());
 #ifdef ADDRESS_SANITIZER
   if (stackState == BlinkGC::HeapPointersOnStack)
     scopeMarker = adjustScopeMarkerForAdressSanitizer(scopeMarker);
 #endif
   ASSERT(stackState == BlinkGC::NoHeapPointersOnStack || scopeMarker);
   runScheduledGC(stackState);
   m_stackState = stackState;
   m_safePointScopeMarker = scopeMarker;
-  m_heap->enterSafePoint(this);
+  pushAllRegisters(nullptr, this, enterSafePointAfterPushRegisters);
 }
 
 void ThreadState::leaveSafePoint() {
   ASSERT(checkThread());
-  m_heap->leaveSafePoint();
   m_stackState = BlinkGC::HeapPointersOnStack;
   clearSafePointScopeMarker();
 }
 
 void ThreadState::reportMemoryToV8() {
   if (!m_isolate)
     return;
 
   size_t currentHeapSize = m_allocatedObjectSize + m_markedObjectSize;
   int64_t diff = static_cast<int64_t>(currentHeapSize) -
@@ skipping 391 matching lines @@
     collectGarbage(BlinkGC::NoHeapPointersOnStack, BlinkGC::GCWithSweep,
                    BlinkGC::ForcedGC);
     size_t liveObjects = heap().heapStats().markedObjectSize();
     if (liveObjects == previousLiveObjects)
       break;
     previousLiveObjects = liveObjects;
   }
 }
 
 }  // namespace blink