Do not make heap iterable eagerly.

R=jarin@chromium.org
BUG=379740
LOG=Y

Review URL: https://codereview.chromium.org/318863004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21691 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.h

@@ -764,10 +764,6 @@ class Heap {
   // Check whether the heap is currently iterable.
   bool IsHeapIterable();
 
-  // Ensure that we have swept all spaces in such a way that we can iterate
-  // over all objects.  May cause a GC.
-  void MakeHeapIterable();
-
   // Notify the heap that a context has been disposed.
   int NotifyContextDisposed();
 
@@ -1707,6 +1703,10 @@ class Heap {
   // with the allocation memento of the object at the top
   void EnsureFillerObjectAtTop();
 
+  // Ensure that we have swept all spaces in such a way that we can iterate
+  // over all objects.  May cause a GC.
+  void MakeHeapIterable();
+
   // Performs garbage collection operation.
   // Returns whether there is a chance that another major GC could
   // collect more garbage.
@@ -2171,10 +2171,11 @@ class Heap {
 
   int gc_callbacks_depth_;
 
+  friend class AlwaysAllocateScope;
   friend class Factory;
+  friend class GCCallbacksScope;
   friend class GCTracer;
-  friend class AlwaysAllocateScope;
-  friend class Page;
+  friend class HeapIterator;
   friend class Isolate;
   friend class MarkCompactCollector;
   friend class MarkCompactMarkingVisitor;
@@ -2182,7 +2183,7 @@ class Heap {
 #ifdef VERIFY_HEAP
   friend class NoWeakObjectVerificationScope;
 #endif
-  friend class GCCallbacksScope;
+  friend class Page;
 
   DISALLOW_COPY_AND_ASSIGN(Heap);
 };

src/liveedit.cc

@@ -1188,8 +1188,6 @@ void LiveEdit::ReplaceFunctionCode(
 
   Handle<SharedFunctionInfo> shared_info = shared_info_wrapper.GetInfo();
 
-  isolate->heap()->MakeHeapIterable();
-
   if (IsJSFunctionCode(shared_info->code())) {
     Handle<Code> code = compile_info_wrapper.GetFunctionCode();
     ReplaceCodeObject(Handle<Code>(shared_info->code()), code);
@@ -1425,8 +1423,6 @@ void LiveEdit::PatchFunctionPositions(Handle<JSArray> shared_info_array,
   info->set_end_position(new_function_end);
   info->set_function_token_position(new_function_token_pos);
 
-  info->GetIsolate()->heap()->MakeHeapIterable();
-
   if (IsJSFunctionCode(info->code())) {
     // Patch relocation info section of the code.
     Handle<Code> patched_code = PatchPositionsInCode(Handle<Code>(info->code()),