Remove GC prologue and epilogue callbacks.

runtime/vm/heap.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_HEAP_H_
 #define RUNTIME_VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 24 matching lines @@
 
   enum WeakSelector {
     kPeers = 0,
 #if !defined(HASH_IN_OBJECT_HEADER)
     kHashes,
 #endif
     kObjectIds,
     kNumWeakSelectors
   };
 
-  enum ApiCallbacks { kIgnoreApiCallbacks, kInvokeApiCallbacks };
-
   enum GCReason {
     kNewSpace,
     kPromotion,
     kOldSpace,
     kFull,
     kGCAtAlloc,
     kGCTestCase,
   };
 
   // Pattern for unused new space and swept old space.
@@ skipping 43 matching lines @@
   // point.
   // The 'visitor' function should return false if the object is not found,
   // traversal through the heap space continues.
   // Returns null object if nothing is found.
   RawInstructions* FindObjectInCodeSpace(FindObjectVisitor* visitor) const;
   RawObject* FindOldObject(FindObjectVisitor* visitor) const;
   RawObject* FindNewObject(FindObjectVisitor* visitor) const;
   RawObject* FindObject(FindObjectVisitor* visitor) const;
 
   void CollectGarbage(Space space);
-  void CollectGarbage(Space space, ApiCallbacks api_callbacks, GCReason reason);
+  void CollectGarbage(Space space, GCReason reason);
   void CollectAllGarbage();
   bool NeedsGarbageCollection() const {
     return old_space_.NeedsGarbageCollection();
   }
 
   void WaitForSweeperTasks(Thread* thread);
 
   // Enables growth control on the page space heaps.  This should be
   // called before any user code is executed.
   void InitGrowthControl();
@@ skipping 184 matching lines @@
   void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectsNoImagePages(ObjectVisitor* visitor) const;
   void VisitObjectsImagePages(ObjectVisitor* visitor) const;
 
   // Like Verify, but does not wait for concurrent sweeper, so caller must
   // ensure thread-safety.
   bool VerifyGC(MarkExpectation mark_expectation = kForbidMarked) const;
 
   // Helper functions for garbage collection.
   void CollectNewSpaceGarbage(Thread* thread,
-                              ApiCallbacks api_callbacks,
                               GCReason reason);
   void CollectOldSpaceGarbage(Thread* thread,
-                              ApiCallbacks api_callbacks,
                               GCReason reason);
   void EvacuateNewSpace(Thread* thread, GCReason reason);
 
   // GC stats collection.
   void RecordBeforeGC(Space space, GCReason reason);
   void RecordAfterGC(Space space);
   void PrintStats();
   void UpdateClassHeapStatsBeforeGC(Heap::Space space);
   void PrintStatsToTimeline(TimelineEventScope* event);
 
@@ skipping 78 matching lines @@
 // Note: During this scope, the code pages are non-executable.
 class WritableVMIsolateScope : StackResource {
  public:
   explicit WritableVMIsolateScope(Thread* thread);
   ~WritableVMIsolateScope();
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_HEAP_H_