Implement a heap profiler for the Dart managed heap.

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
diff --git a/runtime/vm/heap.cc b/runtime/vm/heap.cc
index afe85e85dde505a8970164f6c0bd7a891458677c..82c1f9c4e062fd782d0de0a1391e41270288f485 100644
--- a/runtime/vm/heap.cc
+++ b/runtime/vm/heap.cc
@@ -8,11 +8,13 @@
 #include "platform/utils.h"
 #include "vm/compiler_stats.h"
 #include "vm/flags.h"
+#include "vm/heap_profiler.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/pages.h"
 #include "vm/scavenger.h"
+#include "vm/stack_frame.h"
 #include "vm/verifier.h"
 #include "vm/virtual_memory.h"
 
@@ -220,6 +222,28 @@ void Heap::PrintSizes() const {
 }
 
 
+void Heap::Profile(Dart_HeapProfileWriteCallback callback, void* stream) const {
+  HeapProfiler profiler(callback, stream);
+
+  // Dump the root set.
+  HeapProfilerRootVisitor root_visitor(&profiler);
+  Isolate* isolate = Isolate::Current();
+  Isolate* vm_isolate = Dart::vm_isolate();
+  isolate->VisitObjectPointers(&root_visitor, false,
+                               StackFrameIterator::kDontValidateFrames);
+  HeapProfilerWeakRootVisitor weak_root_visitor(&root_visitor);
+  isolate->VisitWeakPersistentHandles(&weak_root_visitor, true);
+
+  // Dump the current and VM isolate heaps.
+  HeapProfilerObjectVisitor object_visitor(&profiler);
+  isolate->heap()->new_space_->VisitObjects(&object_visitor);
+  isolate->heap()->old_space_->VisitObjects(&object_visitor);
+  isolate->heap()->code_space_->VisitObjects(&object_visitor);
+  vm_isolate->heap()->new_space_->VisitObjects(&object_visitor);
+  vm_isolate->heap()->old_space_->VisitObjects(&object_visitor);
+}
+
+
 #if defined(DEBUG)
 NoGCScope::NoGCScope() : StackResource(Isolate::Current()) {
   isolate()->IncrementNoGCScopeDepth();