[heap] Introduce enum of garbage collection reasons.

src/profiler/heap-snapshot-generator.cc

 // Copyright 2013 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.
 
 #include "src/profiler/heap-snapshot-generator.h"
 
 #include "src/code-stubs.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/objects-body-descriptors.h"
@@ skipping 458 matching lines @@
   time_intervals_.Clear();
 }
 
 
 void HeapObjectsMap::UpdateHeapObjectsMap() {
   if (FLAG_heap_profiler_trace_objects) {
     PrintF("Begin HeapObjectsMap::UpdateHeapObjectsMap. map has %d entries.\n",
            entries_map_.occupancy());
   }
   heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "HeapObjectsMap::UpdateHeapObjectsMap");
+                           GarbageCollectionReason::kHeapProfiler);
   HeapIterator iterator(heap_);
   for (HeapObject* obj = iterator.next();
        obj != NULL;
        obj = iterator.next()) {
     FindOrAddEntry(obj->address(), obj->Size());
     if (FLAG_heap_profiler_trace_objects) {
       PrintF("Update object      : %p %6d. Next address is %p\n",
              static_cast<void*>(obj->address()), obj->Size(),
              static_cast<void*>(obj->address() + obj->Size()));
     }
@@ skipping 2009 matching lines @@
 }
 
 
 bool HeapSnapshotGenerator::GenerateSnapshot() {
   v8_heap_explorer_.TagGlobalObjects();
 
   // TODO(1562) Profiler assumes that any object that is in the heap after
   // full GC is reachable from the root when computing dominators.
   // This is not true for weakly reachable objects.
   // As a temporary solution we call GC twice.
-  heap_->CollectAllGarbage(
-      Heap::kMakeHeapIterableMask,
-      "HeapSnapshotGenerator::GenerateSnapshot");
-  heap_->CollectAllGarbage(
-      Heap::kMakeHeapIterableMask,
-      "HeapSnapshotGenerator::GenerateSnapshot");
+  heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                           GarbageCollectionReason::kHeapProfiler);
+  heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                           GarbageCollectionReason::kHeapProfiler);
 
 #ifdef VERIFY_HEAP
   Heap* debug_heap = heap_;
   if (FLAG_verify_heap) {
     debug_heap->Verify();
   }
 #endif
 
   SetProgressTotal(2);  // 2 passes.
 
@@ skipping 598 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8