Report the reason for a garbage collection when verbose GC is enabled.

runtime/vm/heap.cc

 // 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.
 
 #include "vm/heap.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/compiler_stats.h"
 #include "vm/flags.h"
@@ skipping 159 matching lines @@
   RawObject* raw_obj = code_space_->FindObject(visitor);
   ASSERT((raw_obj == Object::null()) ||
          (raw_obj->GetClassId() == kInstructionsCid));
   return reinterpret_cast<RawInstructions*>(raw_obj);
 }
 
 
 void Heap::CollectGarbage(Space space, ApiCallbacks api_callbacks) {
   bool invoke_api_callbacks = (api_callbacks == kInvokeApiCallbacks);
   switch (space) {
-    case kNew:
-      new_space_->Scavenge(invoke_api_callbacks);
+    case kNew: {
+      new_space_->Scavenge(invoke_api_callbacks,
+                           GCReasonToString(kNewSpace));
       if (new_space_->HadPromotionFailure()) {
-        old_space_->MarkSweep(true);
+        old_space_->MarkSweep(true,
+                              GCReasonToString(kPromotionFailure));
       }
       break;
+    }
     case kOld:
-      old_space_->MarkSweep(invoke_api_callbacks);
+      old_space_->MarkSweep(invoke_api_callbacks,
+                            GCReasonToString(kOldSpace));
       break;
     case kCode:
       UNIMPLEMENTED();
-      code_space_->MarkSweep(invoke_api_callbacks);
+      code_space_->MarkSweep(invoke_api_callbacks,
+                             GCReasonToString(kCodeSpace));
       break;
     default:
       UNREACHABLE();
   }
   if (FLAG_verbose_gc) {
     PrintSizes();
   }
 }
 
 
 void Heap::CollectGarbage(Space space) {
   ApiCallbacks api_callbacks;
   if (space == kOld) {
     api_callbacks = kInvokeApiCallbacks;
   } else {
     api_callbacks = kIgnoreApiCallbacks;
   }
   CollectGarbage(space, api_callbacks);
 }
 
 
 void Heap::CollectAllGarbage() {
-  new_space_->Scavenge(kInvokeApiCallbacks);
-  old_space_->MarkSweep(kInvokeApiCallbacks);
+  const char* gc_reason = GCReasonToString(kFull);
+  new_space_->Scavenge(kInvokeApiCallbacks, gc_reason);
+  old_space_->MarkSweep(kInvokeApiCallbacks, gc_reason);
   // TODO(iposva): Merge old and code space.
-  // code_space_->MarkSweep(kInvokeApiCallbacks);
+  // code_space_->MarkSweep(kInvokeApiCallbacks, gc_reason);
   if (FLAG_verbose_gc) {
     PrintSizes();
   }
 }
 
 
 void Heap::EnableGrowthControl() {
   old_space_->EnableGrowthControl();
 }
 
@@ skipping 98 matching lines @@
   HeapProfilerWeakRootVisitor weak_root_visitor(&root_visitor);
   isolate->VisitWeakPersistentHandles(&weak_root_visitor, true);
 
   // Dump the current and VM isolate heaps.
   HeapProfilerObjectVisitor object_visitor(isolate, &profiler);
   isolate->heap()->IterateObjects(&object_visitor);
   vm_isolate->heap()->IterateObjects(&object_visitor);
 }
 
 
+const char* Heap::GCReasonToString(GCReason gc_reason) {
+  switch (gc_reason) {
+    case kNewSpace:
+      return "new space";
+    case kPromotionFailure:
+      return "promotion failure";
+    case kOldSpace:
+      return "old space";
+    case kCodeSpace:
+      return "code space";
+    case kFull:
+      return "full";
+    case kGCAtAlloc:
+      return "debugging";
+    case kGCTestCase:
+      return "test case";
+    default:
+      UNREACHABLE();
+      return "";
+  }
+}
+
+
 #if defined(DEBUG)
 NoGCScope::NoGCScope() : StackResource(Isolate::Current()) {
   isolate()->IncrementNoGCScopeDepth();
 }
 
 
 NoGCScope::~NoGCScope() {
   isolate()->DecrementNoGCScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart