Introduce callback for resolving global object name while taking heap snapshot

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 //
 // Tests for heap profiler
 
 #include <ctype.h>
 
 #include "v8.h"
 
 #include "cctest.h"
 #include "hashmap.h"
@@ skipping 1209 matching lines @@
   const_cast<v8::HeapSnapshot*>(s2)->Delete();
   CHECK_EQ(1, v8::HeapProfiler::GetSnapshotsCount());
   CHECK_EQ(NULL, v8::HeapProfiler::FindSnapshot(uid2));
   CHECK_EQ(s3, v8::HeapProfiler::FindSnapshot(uid3));
   const_cast<v8::HeapSnapshot*>(s3)->Delete();
   CHECK_EQ(0, v8::HeapProfiler::GetSnapshotsCount());
   CHECK_EQ(NULL, v8::HeapProfiler::FindSnapshot(uid3));
 }
 
 
+class NameResolver : public v8::HeapProfiler::ObjectNameResolver {
+ public:
+  virtual const char* GetName(v8::Handle<v8::Object> object) {
+    return "Global object name";
+  }
+};
+
+TEST(GlobalObjectName) {
+  v8::HandleScope scope;
+  LocalContext env;
+
+  CompileRun("document = { URL:\"abcdefgh\" };");
+
+  NameResolver name_resolver;
+  const v8::HeapSnapshot* snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8_str("document"),
+      v8::HeapSnapshot::kFull,
+      NULL,
+      &name_resolver);
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  CHECK_NE(NULL, global);
+  CHECK_EQ("Object / Global object name" ,
+           const_cast<i::HeapEntry*>(
+               reinterpret_cast<const i::HeapEntry*>(global))->name());
+}
+
+
 TEST(DocumentURL) {
   v8::HandleScope scope;
   LocalContext env;
 
   CompileRun("document = { URL:\"abcdefgh\" };");
 
   const v8::HeapSnapshot* snapshot =
       v8::HeapProfiler::TakeSnapshot(v8_str("document"));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK_NE(NULL, global);
@@ skipping 433 matching lines @@
   const v8::HeapGraphNode* map =
       GetProperty(global_object, v8::HeapGraphEdge::kInternal, "map");
   CHECK_NE(NULL, map);
   const v8::HeapGraphNode* own_descriptors = GetProperty(
       map, v8::HeapGraphEdge::kInternal, "descriptors");
   CHECK_NE(NULL, own_descriptors);
   const v8::HeapGraphNode* own_transitions = GetProperty(
       map, v8::HeapGraphEdge::kInternal, "transitions");
   CHECK_EQ(NULL, own_transitions);
 }