[heap] Hide GCTracer inside the heap component.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index d4248079e72dbb1bc57f1c3af8b644ca86ea1900..da52d3ce8df7ef4ec29cc58239c3a709e8b1db87 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -12,7 +12,6 @@
 #include "src/assert-scope.h"
 #include "src/globals.h"
 #include "src/heap/gc-idle-time-handler.h"
-#include "src/heap/gc-tracer.h"
 #include "src/heap/incremental-marking.h"
 #include "src/heap/mark-compact.h"
 #include "src/heap/memory-reducer.h"
@@ -1344,7 +1343,7 @@ class Heap {
 
   void ClearNormalizedMapCaches();
 
-  GCTracer* tracer() { return &tracer_; }
+  GCTracer* tracer() { return tracer_; }

[Michael Lippautz, 2015/08/20 15:09:07]

Suggestion: GCTracer& ?

[Michael Starzinger, 2015/08/20 15:46:32]

Acknowledged. As discussed offline, let's do this in a separate CL, because
there are a gazillion call-site of this getter.

 
   // Returns the size of objects residing in non new spaces.
   intptr_t PromotedSpaceSizeOfObjects();
@@ -2097,7 +2096,7 @@ class Heap {
 
   int deferred_counters_[v8::Isolate::kUseCounterFeatureCount];
 
-  GCTracer tracer_;
+  GCTracer* tracer_;
 
   // Creates and installs the full-sized number string cache.
   int FullSizeNumberStringCacheLength();