Remove uid and title from HeapSnapshot

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 165 matching lines @@
   v8::HandleScope scope(env2->GetIsolate());
   v8::HeapProfiler* heap_profiler = env2->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function A2() {}\n"
       "function B2(x) { return function() { return typeof x; }; }\n"
       "function C2(x) { this.x1 = x; this.x2 = x; this[1] = x; }\n"
       "var a2 = new A2();\n"
       "var b2_1 = new B2(a2), b2_2 = new B2(a2);\n"
       "var c2 = new C2(a2);");
-  const v8::HeapSnapshot* snapshot_env2 =
-      heap_profiler->TakeHeapSnapshot(v8_str("env2"));
+  const v8::HeapSnapshot* snapshot_env2 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot_env2));
   const v8::HeapGraphNode* global_env2 = GetGlobalObject(snapshot_env2);
 
   // Verify, that JS global object of env2 has '..2' properties.
   const v8::HeapGraphNode* a2_node =
       GetProperty(global_env2, v8::HeapGraphEdge::kProperty, "a2");
   CHECK(a2_node);
   CHECK(GetProperty(global_env2, v8::HeapGraphEdge::kProperty, "b2_1"));
   CHECK(GetProperty(global_env2, v8::HeapGraphEdge::kProperty, "b2_2"));
   CHECK(GetProperty(global_env2, v8::HeapGraphEdge::kProperty, "c2"));
@@ skipping 12 matching lines @@
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   //   -a-> X1 --a
   // x -b-> X2 <-|
   CompileRun(
       "function X(a, b) { this.a = a; this.b = b; }\n"
       "x = new X(new X(), new X());\n"
       "dummy = new X();\n"
       "(function() { x.a.a = x.b; })();");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("sizes"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* x =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "x");
   CHECK(x);
   const v8::HeapGraphNode* x1 =
       GetProperty(x, v8::HeapGraphEdge::kProperty, "a");
   CHECK(x1);
   const v8::HeapGraphNode* x2 =
       GetProperty(x, v8::HeapGraphEdge::kProperty, "b");
   CHECK(x2);
 
   // Test sizes.
   CHECK_NE(0, static_cast<int>(x->GetShallowSize()));
   CHECK_NE(0, static_cast<int>(x1->GetShallowSize()));
   CHECK_NE(0, static_cast<int>(x2->GetShallowSize()));
 }
 
 
 TEST(BoundFunctionInSnapshot) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun(
       "function myFunction(a, b) { this.a = a; this.b = b; }\n"
       "function AAAAA() {}\n"
       "boundFunction = myFunction.bind(new AAAAA(), 20, new Number(12)); \n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("sizes"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* f =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "boundFunction");
   CHECK(f);
   CHECK(v8::String::NewFromUtf8(env->GetIsolate(), "native_bind")
             ->Equals(f->GetName()));
   const v8::HeapGraphNode* bindings =
       GetProperty(f, v8::HeapGraphEdge::kInternal, "bindings");
   CHECK(bindings);
@@ skipping 18 matching lines @@
 
 
 TEST(HeapSnapshotEntryChildren) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function A() { }\n"
       "a = new A;");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("children"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   for (int i = 0, count = global->GetChildrenCount(); i < count; ++i) {
     const v8::HeapGraphEdge* prop = global->GetChild(i);
     CHECK_EQ(global, prop->GetFromNode());
   }
   const v8::HeapGraphNode* a =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "a");
   CHECK(a);
   for (int i = 0, count = a->GetChildrenCount(); i < count; ++i) {
     const v8::HeapGraphEdge* prop = a->GetChild(i);
     CHECK_EQ(a, prop->GetFromNode());
   }
 }
 
 
 TEST(HeapSnapshotCodeObjects) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function lazy(x) { return x - 1; }\n"
       "function compiled(x) { return x + 1; }\n"
       "var anonymous = (function() { return function() { return 0; } })();\n"
       "compiled(1)");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("code"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* compiled =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "compiled");
   CHECK(compiled);
   CHECK_EQ(v8::HeapGraphNode::kClosure, compiled->GetType());
   const v8::HeapGraphNode* lazy =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "lazy");
   CHECK(lazy);
@@ skipping 51 matching lines @@
 }
 
 
 TEST(HeapSnapshotHeapNumbers) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun(
       "a = 1;    // a is Smi\n"
       "b = 2.5;  // b is HeapNumber");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("numbers"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(!GetProperty(global, v8::HeapGraphEdge::kProperty, "a"));
   const v8::HeapGraphNode* b =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "b");
   CHECK(b);
   CHECK_EQ(v8::HeapGraphNode::kHeapNumber, b->GetType());
 }
 
 
 TEST(HeapSnapshotSlicedString) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun(
       "parent_string = \"123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789."
       "123456789.123456789.123456789.123456789.123456789.\";"
       "child_string = parent_string.slice(100);");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("strings"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* parent_string =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "parent_string");
   CHECK(parent_string);
   const v8::HeapGraphNode* child_string =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "child_string");
   CHECK(child_string);
   CHECK_EQ(v8::HeapGraphNode::kSlicedString, child_string->GetType());
   const v8::HeapGraphNode* parent =
@@ skipping 16 matching lines @@
 
   i::Factory* factory = CcTest::i_isolate()->factory();
   i::Handle<i::String> first = factory->NewStringFromStaticChars("0123456789");
   i::Handle<i::String> second = factory->NewStringFromStaticChars("0123456789");
   i::Handle<i::String> cons_string =
       factory->NewConsString(first, second).ToHandleChecked();
 
   global->SetInternalField(0, v8::ToApiHandle<v8::String>(cons_string));
 
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("cons_strings"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global_node = GetGlobalObject(snapshot);
 
   const v8::HeapGraphNode* string_node =
       GetProperty(global_node, v8::HeapGraphEdge::kInternal, "0");
   CHECK(string_node);
   CHECK_EQ(v8::HeapGraphNode::kConsString, string_node->GetType());
 
   const v8::HeapGraphNode* first_node =
       GetProperty(string_node, v8::HeapGraphEdge::kInternal, "first");
   CHECK_EQ(v8::HeapGraphNode::kString, first_node->GetType());
 
   const v8::HeapGraphNode* second_node =
       GetProperty(string_node, v8::HeapGraphEdge::kInternal, "second");
   CHECK_EQ(v8::HeapGraphNode::kString, second_node->GetType());
 
   heap_profiler->DeleteAllHeapSnapshots();
 }
 
 
 TEST(HeapSnapshotSymbol) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("a = Symbol('mySymbol');\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("Symbol"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* a =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "a");
   CHECK(a);
   CHECK_EQ(a->GetType(), v8::HeapGraphNode::kSymbol);
   CHECK(v8_str("symbol")->Equals(a->GetName()));
   const v8::HeapGraphNode* name =
       GetProperty(a, v8::HeapGraphEdge::kInternal, "name");
   CHECK(name);
   CHECK(v8_str("mySymbol")->Equals(name->GetName()));
 }
 
 
 TEST(HeapSnapshotWeakCollection) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "k = {}; v = {}; s = 'str';\n"
       "ws = new WeakSet(); ws.add(k); ws.add(v); ws[s] = s;\n"
       "wm = new WeakMap(); wm.set(k, v); wm[s] = s;\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("WeakCollections"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* k =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "k");
   CHECK(k);
   const v8::HeapGraphNode* v =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "v");
   CHECK(v);
   const v8::HeapGraphNode* s =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "s");
@@ skipping 52 matching lines @@
 
 TEST(HeapSnapshotCollection) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "k = {}; v = {}; s = 'str';\n"
       "set = new Set(); set.add(k); set.add(v); set[s] = s;\n"
       "map = new Map(); map.set(k, v); map[s] = s;\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("Collections"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* k =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "k");
   CHECK(k);
   const v8::HeapGraphNode* v =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "v");
   CHECK(v);
   const v8::HeapGraphNode* s =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "s");
@@ skipping 56 matching lines @@
       v8::ObjectTemplate::New(isolate);
   global_template->SetInternalFieldCount(2);
   LocalContext env(NULL, global_template);
   v8::Handle<v8::Object> global_proxy = env->Global();
   v8::Handle<v8::Object> global = global_proxy->GetPrototype().As<v8::Object>();
   CHECK_EQ(2, global->InternalFieldCount());
   v8::Local<v8::Object> obj = v8::Object::New(isolate);
   global->SetInternalField(0, v8_num(17));
   global->SetInternalField(1, obj);
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("internals"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global_node = GetGlobalObject(snapshot);
   // The first reference will not present, because it's a Smi.
   CHECK(!GetProperty(global_node, v8::HeapGraphEdge::kInternal, "0"));
   // The second reference is to an object.
   CHECK(GetProperty(global_node, v8::HeapGraphEdge::kInternal, "1"));
 }
 
 
 TEST(HeapSnapshotAddressReuse) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function A() {}\n"
       "var a = [];\n"
       "for (var i = 0; i < 10000; ++i)\n"
       "  a[i] = new A();\n");
-  const v8::HeapSnapshot* snapshot1 =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot1"));
+  const v8::HeapSnapshot* snapshot1 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot1));
   v8::SnapshotObjectId maxId1 = snapshot1->GetMaxSnapshotJSObjectId();
 
   CompileRun(
       "for (var i = 0; i < 10000; ++i)\n"
       "  a[i] = new A();\n");
   CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
 
-  const v8::HeapSnapshot* snapshot2 =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot2"));
+  const v8::HeapSnapshot* snapshot2 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot2));
   const v8::HeapGraphNode* global2 = GetGlobalObject(snapshot2);
 
   const v8::HeapGraphNode* array_node =
       GetProperty(global2, v8::HeapGraphEdge::kProperty, "a");
   CHECK(array_node);
   int wrong_count = 0;
   for (int i = 0, count = array_node->GetChildrenCount(); i < count; ++i) {
     const v8::HeapGraphEdge* prop = array_node->GetChild(i);
     if (prop->GetType() != v8::HeapGraphEdge::kElement)
@@ skipping 12 matching lines @@
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function AnObject() {\n"
       "    this.first = 'first';\n"
       "    this.second = 'second';\n"
       "}\n"
       "var a = new Array();\n"
       "for (var i = 0; i < 10; ++i)\n"
       "  a.push(new AnObject());\n");
-  const v8::HeapSnapshot* snapshot1 =
-      heap_profiler->TakeHeapSnapshot(v8_str("s1"));
+  const v8::HeapSnapshot* snapshot1 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot1));
 
   CompileRun(
       "for (var i = 0; i < 1; ++i)\n"
       "  a.shift();\n");
 
   CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
 
-  const v8::HeapSnapshot* snapshot2 =
-      heap_profiler->TakeHeapSnapshot(v8_str("s2"));
+  const v8::HeapSnapshot* snapshot2 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot2));
 
   const v8::HeapGraphNode* global1 = GetGlobalObject(snapshot1);
   const v8::HeapGraphNode* global2 = GetGlobalObject(snapshot2);
   CHECK_NE(0u, global1->GetId());
   CHECK_EQ(global1->GetId(), global2->GetId());
 
   const v8::HeapGraphNode* a1 =
       GetProperty(global1, v8::HeapGraphEdge::kProperty, "a");
   CHECK(a1);
@@ skipping 15 matching lines @@
 TEST(HeapEntryIdsAndGC) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "function A() {}\n"
       "function B(x) { this.x = x; }\n"
       "var a = new A();\n"
       "var b = new B(a);");
-  v8::Local<v8::String> s1_str = v8_str("s1");
-  v8::Local<v8::String> s2_str = v8_str("s2");
-  const v8::HeapSnapshot* snapshot1 =
-      heap_profiler->TakeHeapSnapshot(s1_str);
+  const v8::HeapSnapshot* snapshot1 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot1));
 
   CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
 
-  const v8::HeapSnapshot* snapshot2 =
-      heap_profiler->TakeHeapSnapshot(s2_str);
+  const v8::HeapSnapshot* snapshot2 = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot2));
 
   CHECK_GT(snapshot1->GetMaxSnapshotJSObjectId(), 7000u);
   CHECK(snapshot1->GetMaxSnapshotJSObjectId() <=
         snapshot2->GetMaxSnapshotJSObjectId());
 
   const v8::HeapGraphNode* global1 = GetGlobalObject(snapshot1);
   const v8::HeapGraphNode* global2 = GetGlobalObject(snapshot2);
   CHECK_NE(0u, global1->GetId());
   CHECK_EQ(global1->GetId(), global2->GetId());
@@ skipping 29 matching lines @@
   CHECK(b2);
   CHECK_NE(0u, b1->GetId());
   CHECK_EQ(b1->GetId(), b2->GetId());
 }
 
 
 TEST(HeapSnapshotRootPreservedAfterSorting) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("s"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* root1 = snapshot->GetRoot();
   const_cast<i::HeapSnapshot*>(reinterpret_cast<const i::HeapSnapshot*>(
       snapshot))->GetSortedEntriesList();
   const v8::HeapGraphNode* root2 = snapshot->GetRoot();
   CHECK_EQ(root1, root2);
 }
 
 
 namespace {
@@ skipping 47 matching lines @@
   v8::HandleScope scope(isolate);
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
 
 #define STRING_LITERAL_FOR_TEST \
   "\"String \\n\\r\\u0008\\u0081\\u0101\\u0801\\u8001\""
   CompileRun(
       "function A(s) { this.s = s; }\n"
       "function B(x) { this.x = x; }\n"
       "var a = new A(" STRING_LITERAL_FOR_TEST ");\n"
       "var b = new B(a);");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("json"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   TestJSONStream stream;
   snapshot->Serialize(&stream, v8::HeapSnapshot::kJSON);
   CHECK_GT(stream.size(), 0);
   CHECK_EQ(1, stream.eos_signaled());
   i::ScopedVector<char> json(stream.size());
   stream.WriteTo(json);
 
   // Verify that snapshot string is valid JSON.
@@ skipping 78 matching lines @@
 #undef STRING_LITERAL_FOR_TEST
   CHECK_EQ(0, strcmp(*v8::String::Utf8Value(ref_string),
                      *v8::String::Utf8Value(string)));
 }
 
 
 TEST(HeapSnapshotJSONSerializationAborting) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("abort"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   TestJSONStream stream(5);
   snapshot->Serialize(&stream, v8::HeapSnapshot::kJSON);
   CHECK_GT(stream.size(), 0);
   CHECK_EQ(0, stream.eos_signaled());
 }
 
 namespace {
 
 class TestStatsStream : public v8::OutputStream {
@@ skipping 261 matching lines @@
     CheckChildrenIds(snapshot, child, level + 1, max_level);
   }
 }
 
 
 TEST(HeapSnapshotGetNodeById) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("id"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* root = snapshot->GetRoot();
   CheckChildrenIds(snapshot, root, 0, 3);
   // Check a big id, which should not exist yet.
   CHECK(!snapshot->GetNodeById(0x1000000UL));
 }
 
 
 TEST(HeapSnapshotGetSnapshotObjectId) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("globalObject = {};\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("get_snapshot_object_id"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* global_object =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "globalObject");
   CHECK(global_object);
 
   v8::Local<v8::Value> globalObjectHandle = env->Global()->Get(
       v8::String::NewFromUtf8(env->GetIsolate(), "globalObject"));
   CHECK(!globalObjectHandle.IsEmpty());
   CHECK(globalObjectHandle->IsObject());
 
   v8::SnapshotObjectId id = heap_profiler->GetObjectId(globalObjectHandle);
   CHECK_NE(v8::HeapProfiler::kUnknownObjectId, id);
   CHECK_EQ(id, global_object->GetId());
 }
 
 
 TEST(HeapSnapshotUnknownSnapshotObjectId) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("globalObject = {};\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("unknown_object_id"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* node =
       snapshot->GetNodeById(v8::HeapProfiler::kUnknownObjectId);
   CHECK(!node);
 }
 
 
 namespace {
 
 class TestActivityControl : public v8::ActivityControl {
@@ skipping 17 matching lines @@
 
 
 TEST(TakeHeapSnapshotAborting) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   const int snapshots_count = heap_profiler->GetSnapshotCount();
   TestActivityControl aborting_control(1);
   const v8::HeapSnapshot* no_snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("abort"),
-                                     &aborting_control);
+      heap_profiler->TakeHeapSnapshot(&aborting_control);
   CHECK(!no_snapshot);
   CHECK_EQ(snapshots_count, heap_profiler->GetSnapshotCount());
   CHECK_GT(aborting_control.total(), aborting_control.done());
 
   TestActivityControl control(-1);  // Don't abort.
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("full"),
-                                     &control);
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot(&control);
   CHECK(ValidateSnapshot(snapshot));
 
   CHECK(snapshot);
   CHECK_EQ(snapshots_count + 1, heap_profiler->GetSnapshotCount());
   CHECK_EQ(control.total(), control.done());
   CHECK_GT(control.total(), 0);
 }
 
 
 namespace {
@@ skipping 90 matching lines @@
       1, TestRetainedObjectInfo::WrapperInfoCallback);
   heap_profiler->SetWrapperClassInfoProvider(
       2, TestRetainedObjectInfo::WrapperInfoCallback);
   v8::Persistent<v8::String> p_AAA(isolate, v8_str("AAA"));
   p_AAA.SetWrapperClassId(1);
   v8::Persistent<v8::String> p_BBB(isolate, v8_str("BBB"));
   p_BBB.SetWrapperClassId(1);
   v8::Persistent<v8::String> p_CCC(isolate, v8_str("CCC"));
   p_CCC.SetWrapperClassId(2);
   CHECK_EQ(0, TestRetainedObjectInfo::instances.length());
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("retained"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   CHECK_EQ(3, TestRetainedObjectInfo::instances.length());
   for (int i = 0; i < TestRetainedObjectInfo::instances.length(); ++i) {
     CHECK(TestRetainedObjectInfo::instances[i]->disposed());
     delete TestRetainedObjectInfo::instances[i];
   }
 
   const v8::HeapGraphNode* native_group_aaa = GetNode(
       snapshot->GetRoot(), v8::HeapGraphNode::kSynthetic, "aaa-group");
@@ skipping 71 matching lines @@
 
 
 TEST(HeapSnapshotImplicitReferences) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   GraphWithImplicitRefs graph(&env);
   v8::V8::AddGCPrologueCallback(&GraphWithImplicitRefs::gcPrologue);
 
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("implicit_refs"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global_object = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* obj0 = GetProperty(
       global_object, v8::HeapGraphEdge::kProperty, "root_object");
   CHECK(obj0);
   CHECK_EQ(v8::HeapGraphNode::kObject, obj0->GetType());
   const v8::HeapGraphNode* obj1 = GetProperty(
       obj0, v8::HeapGraphEdge::kInternal, "native");
   CHECK(obj1);
@@ skipping 12 matching lines @@
 
 
 TEST(DeleteAllHeapSnapshots) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
   heap_profiler->DeleteAllHeapSnapshots();
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
-  CHECK(heap_profiler->TakeHeapSnapshot(v8_str("1")));
+  CHECK(heap_profiler->TakeHeapSnapshot());
   CHECK_EQ(1, heap_profiler->GetSnapshotCount());
   heap_profiler->DeleteAllHeapSnapshots();
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
-  CHECK(heap_profiler->TakeHeapSnapshot(v8_str("1")));
-  CHECK(heap_profiler->TakeHeapSnapshot(v8_str("2")));
+  CHECK(heap_profiler->TakeHeapSnapshot());
+  CHECK(heap_profiler->TakeHeapSnapshot());
   CHECK_EQ(2, heap_profiler->GetSnapshotCount());
   heap_profiler->DeleteAllHeapSnapshots();
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
 }
 
 
-static const v8::HeapSnapshot* FindHeapSnapshot(v8::HeapProfiler* profiler,
-                                                unsigned uid) {
+static bool FindHeapSnapshot(v8::HeapProfiler* profiler,
+                             const v8::HeapSnapshot* snapshot) {
   int length = profiler->GetSnapshotCount();
   for (int i = 0; i < length; i++) {
-    const v8::HeapSnapshot* snapshot = profiler->GetHeapSnapshot(i);
-    if (snapshot->GetUid() == uid) {
-      return snapshot;
-    }
+    if (snapshot == profiler->GetHeapSnapshot(i)) return true;
   }
-  return NULL;
+  return false;
 }
 
 
 TEST(DeleteHeapSnapshot) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
-  const v8::HeapSnapshot* s1 =
-      heap_profiler->TakeHeapSnapshot(v8_str("1"));
+  const v8::HeapSnapshot* s1 = heap_profiler->TakeHeapSnapshot();
 
   CHECK(s1);
   CHECK_EQ(1, heap_profiler->GetSnapshotCount());
-  unsigned uid1 = s1->GetUid();
-  CHECK_EQ(s1, FindHeapSnapshot(heap_profiler, uid1));
+  CHECK(FindHeapSnapshot(heap_profiler, s1));
   const_cast<v8::HeapSnapshot*>(s1)->Delete();
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
-  CHECK(!FindHeapSnapshot(heap_profiler, uid1));
+  CHECK(!FindHeapSnapshot(heap_profiler, s1));
 
-  const v8::HeapSnapshot* s2 =
-      heap_profiler->TakeHeapSnapshot(v8_str("2"));
+  const v8::HeapSnapshot* s2 = heap_profiler->TakeHeapSnapshot();
   CHECK(s2);
   CHECK_EQ(1, heap_profiler->GetSnapshotCount());
-  unsigned uid2 = s2->GetUid();
-  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid2));
-  CHECK_EQ(s2, FindHeapSnapshot(heap_profiler, uid2));
-  const v8::HeapSnapshot* s3 =
-      heap_profiler->TakeHeapSnapshot(v8_str("3"));
+  CHECK(FindHeapSnapshot(heap_profiler, s2));
+  const v8::HeapSnapshot* s3 = heap_profiler->TakeHeapSnapshot();
   CHECK(s3);
   CHECK_EQ(2, heap_profiler->GetSnapshotCount());
-  unsigned uid3 = s3->GetUid();
-  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid3));
-  CHECK_EQ(s3, FindHeapSnapshot(heap_profiler, uid3));
+  CHECK_NE(s2, s3);
+  CHECK(FindHeapSnapshot(heap_profiler, s3));
   const_cast<v8::HeapSnapshot*>(s2)->Delete();
   CHECK_EQ(1, heap_profiler->GetSnapshotCount());
-  CHECK(!FindHeapSnapshot(heap_profiler, uid2));
-  CHECK_EQ(s3, FindHeapSnapshot(heap_profiler, uid3));
+  CHECK(!FindHeapSnapshot(heap_profiler, s2));
+  CHECK(FindHeapSnapshot(heap_profiler, s3));
   const_cast<v8::HeapSnapshot*>(s3)->Delete();
   CHECK_EQ(0, heap_profiler->GetSnapshotCount());
-  CHECK(!FindHeapSnapshot(heap_profiler, uid3));
+  CHECK(!FindHeapSnapshot(heap_profiler, s3));
 }
 
 
 class NameResolver : public v8::HeapProfiler::ObjectNameResolver {
  public:
   virtual const char* GetName(v8::Handle<v8::Object> object) {
     return "Global object name";
   }
 };
 
 
 TEST(GlobalObjectName) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("document = { URL:\"abcdefgh\" };");
 
   NameResolver name_resolver;
   const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("document"),
-      NULL,
-      &name_resolver);
+      heap_profiler->TakeHeapSnapshot(NULL, &name_resolver);
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   CHECK_EQ(0,
            strcmp("Object / Global object name",
                   const_cast<i::HeapEntry*>(
                       reinterpret_cast<const i::HeapEntry*>(global))->name()));
 }
 
 
 TEST(GlobalObjectFields) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("obj = {};");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* builtins =
       GetProperty(global, v8::HeapGraphEdge::kInternal, "builtins");
   CHECK(builtins);
   const v8::HeapGraphNode* native_context =
       GetProperty(global, v8::HeapGraphEdge::kInternal, "native_context");
   CHECK(native_context);
   const v8::HeapGraphNode* global_proxy =
       GetProperty(global, v8::HeapGraphEdge::kInternal, "global_proxy");
   CHECK(global_proxy);
 }
 
 
 TEST(NoHandleLeaks) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("document = { URL:\"abcdefgh\" };");
 
-  v8::Handle<v8::String> name(v8_str("leakz"));
   i::Isolate* isolate = CcTest::i_isolate();
   int count_before = i::HandleScope::NumberOfHandles(isolate);
-  heap_profiler->TakeHeapSnapshot(name);
+  heap_profiler->TakeHeapSnapshot();
   int count_after = i::HandleScope::NumberOfHandles(isolate);
   CHECK_EQ(count_before, count_after);
 }
 
 
 TEST(NodesIteration) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("iteration"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   // Verify that we can find this object by iteration.
   const int nodes_count = snapshot->GetNodesCount();
   int count = 0;
   for (int i = 0; i < nodes_count; ++i) {
     if (snapshot->GetNode(i) == global)
       ++count;
   }
   CHECK_EQ(1, count);
 }
 
 
 TEST(GetHeapValueForNode) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("a = { s_prop: \'value\', n_prop: \'value2\' };");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("value"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(heap_profiler->FindObjectById(global->GetId())->IsObject());
   v8::Local<v8::Object> js_global =
       env->Global()->GetPrototype().As<v8::Object>();
   CHECK(js_global == heap_profiler->FindObjectById(global->GetId()));
   const v8::HeapGraphNode* obj = GetProperty(
       global, v8::HeapGraphEdge::kProperty, "a");
   CHECK(heap_profiler->FindObjectById(obj->GetId())->IsObject());
   v8::Local<v8::Object> js_obj = js_global->Get(v8_str("a")).As<v8::Object>();
@@ skipping 13 matching lines @@
 
 TEST(GetHeapValueForDeletedObject) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   // It is impossible to delete a global property, so we are about to delete a
   // property of the "a" object. Also, the "p" object can't be an empty one
   // because the empty object is static and isn't actually deleted.
   CompileRun("a = { p: { r: {} } };");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* obj = GetProperty(
       global, v8::HeapGraphEdge::kProperty, "a");
   const v8::HeapGraphNode* prop = GetProperty(
       obj, v8::HeapGraphEdge::kProperty, "p");
   {
     // Perform the check inside a nested local scope to avoid creating a
     // reference to the object we are deleting.
     v8::HandleScope scope(env->GetIsolate());
@@ skipping 69 matching lines @@
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("var obj1 = {};\n"
              "obj1.__defineGetter__('propWithGetter', function Y() {\n"
              "  return 42;\n"
              "});\n"
              "obj1.__defineSetter__('propWithSetter', function Z(value) {\n"
              "  return this.value_ = value;\n"
              "});\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("fastCaseAccessors"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* obj1 =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "obj1");
   CHECK(obj1);
   const v8::HeapGraphNode* func;
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "get propWithGetter");
   CHECK(func);
@@ skipping 24 matching lines @@
       "  set: function(value) { return this.prop_ = value; },\n"
       "  configurable: true,\n"
       "  enumerable: true,\n"
       "});\n");
   v8::Local<v8::Object> js_global =
       env->Global()->GetPrototype().As<v8::Object>();
   i::Handle<i::JSObject> js_obj1 =
       v8::Utils::OpenHandle(*js_global->Get(v8_str("obj1")).As<v8::Object>());
   USE(js_obj1);
 
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("fastCaseAccessors"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* obj1 =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "obj1");
   CHECK(obj1);
   const v8::HeapGraphNode* func;
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "get prop");
   CHECK(func);
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "set prop");
   CHECK(func);
 }
 
 
 TEST(SlowCaseAccessors) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("var obj1 = {};\n"
              "for (var i = 0; i < 100; ++i) obj1['z' + i] = {};"
              "obj1.__defineGetter__('propWithGetter', function Y() {\n"
              "  return 42;\n"
              "});\n"
              "obj1.__defineSetter__('propWithSetter', function Z(value) {\n"
              "  return this.value_ = value;\n"
              "});\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("slowCaseAccessors"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* obj1 =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "obj1");
   CHECK(obj1);
   const v8::HeapGraphNode* func;
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "get propWithGetter");
   CHECK(func);
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "set propWithGetter");
   CHECK(!func);
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "set propWithSetter");
   CHECK(func);
   func = GetProperty(obj1, v8::HeapGraphEdge::kProperty, "get propWithSetter");
   CHECK(!func);
 }
 
 
 TEST(HiddenPropertiesFastCase) {
   v8::Isolate* isolate = CcTest::isolate();
   LocalContext env;
   v8::HandleScope scope(isolate);
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
 
   CompileRun(
       "function C(x) { this.a = this; this.b = x; }\n"
       "c = new C(2012);\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("HiddenPropertiesFastCase1"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* c =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "c");
   CHECK(c);
   const v8::HeapGraphNode* hidden_props =
       GetProperty(c, v8::HeapGraphEdge::kInternal, "hidden_properties");
   CHECK(!hidden_props);
 
   v8::Handle<v8::Value> cHandle =
       env->Global()->Get(v8::String::NewFromUtf8(env->GetIsolate(), "c"));
   CHECK(!cHandle.IsEmpty() && cHandle->IsObject());
   cHandle->ToObject(isolate)->SetHiddenValue(v8_str("key"), v8_str("val"));
 
-  snapshot = heap_profiler->TakeHeapSnapshot(
-      v8_str("HiddenPropertiesFastCase2"));
+  snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   global = GetGlobalObject(snapshot);
   c = GetProperty(global, v8::HeapGraphEdge::kProperty, "c");
   CHECK(c);
   hidden_props = GetProperty(c, v8::HeapGraphEdge::kInternal,
       "hidden_properties");
   CHECK(hidden_props);
 }
 
 
 TEST(AccessorInfo) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("function foo(x) { }\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("AccessorInfoTest"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* foo =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "foo");
   CHECK(foo);
   const v8::HeapGraphNode* map =
       GetProperty(foo, v8::HeapGraphEdge::kInternal, "map");
   CHECK(map);
   const v8::HeapGraphNode* descriptors =
       GetProperty(map, v8::HeapGraphEdge::kInternal, "descriptors");
@@ skipping 24 matching lines @@
     const v8::HeapGraphEdge* handle_edge = node->GetChild(i);
     if (handle_edge->GetType() == v8::HeapGraphEdge::kWeak) return true;
   }
   return false;
 }
 
 
 bool HasWeakGlobalHandle() {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("weaks"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* gc_roots = GetNode(
       snapshot->GetRoot(), v8::HeapGraphNode::kSynthetic, "(GC roots)");
   CHECK(gc_roots);
   const v8::HeapGraphNode* global_handles = GetNode(
       gc_roots, v8::HeapGraphNode::kSynthetic, "(Global handles)");
   CHECK(global_handles);
   return HasWeakEdge(global_handles);
 }
 
@@ skipping 19 matching lines @@
 }
 
 
 TEST(SfiAndJsFunctionWeakRefs) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "fun = (function (x) { return function () { return x + 1; } })(1);");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("fun"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* fun =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "fun");
   CHECK(!HasWeakEdge(fun));
   const v8::HeapGraphNode* shared =
       GetProperty(fun, v8::HeapGraphEdge::kInternal, "shared");
   CHECK(!HasWeakEdge(shared));
 }
 
 
 TEST(NoDebugObjectInSnapshot) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CHECK(CcTest::i_isolate()->debug()->Load());
   CompileRun("foo = {};");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* root = snapshot->GetRoot();
   int globals_count = 0;
   for (int i = 0; i < root->GetChildrenCount(); ++i) {
     const v8::HeapGraphEdge* edge = root->GetChild(i);
     if (edge->GetType() == v8::HeapGraphEdge::kShortcut) {
       ++globals_count;
       const v8::HeapGraphNode* global = edge->GetToNode();
       const v8::HeapGraphNode* foo =
           GetProperty(global, v8::HeapGraphEdge::kProperty, "foo");
       CHECK(foo);
     }
   }
   CHECK_EQ(1, globals_count);
 }
 
 
 TEST(AllStrongGcRootsHaveNames) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun("foo = {};");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* gc_roots = GetNode(
       snapshot->GetRoot(), v8::HeapGraphNode::kSynthetic, "(GC roots)");
   CHECK(gc_roots);
   const v8::HeapGraphNode* strong_roots = GetNode(
       gc_roots, v8::HeapGraphNode::kSynthetic, "(Strong roots)");
   CHECK(strong_roots);
   for (int i = 0; i < strong_roots->GetChildrenCount(); ++i) {
     const v8::HeapGraphEdge* edge = strong_roots->GetChild(i);
     CHECK_EQ(v8::HeapGraphEdge::kInternal, edge->GetType());
     v8::String::Utf8Value name(edge->GetName());
     CHECK(isalpha(**name));
   }
 }
 
 
 TEST(NoRefsToNonEssentialEntries) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("global_object = {};\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* global_object =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "global_object");
   CHECK(global_object);
   const v8::HeapGraphNode* properties =
       GetProperty(global_object, v8::HeapGraphEdge::kInternal, "properties");
   CHECK(!properties);
   const v8::HeapGraphNode* elements =
       GetProperty(global_object, v8::HeapGraphEdge::kInternal, "elements");
   CHECK(!elements);
 }
 
 
 TEST(MapHasDescriptorsAndTransitions) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("obj = { a: 10 };\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* global_object =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "obj");
   CHECK(global_object);
 
   const v8::HeapGraphNode* map =
       GetProperty(global_object, v8::HeapGraphEdge::kInternal, "map");
   CHECK(map);
   const v8::HeapGraphNode* own_descriptors = GetProperty(
@@ skipping 17 matching lines @@
       "for (var i = 0; i < n; i++) {"
       "    var f = 'function f_' + i + '() { ';"
       "    if (i > 0)"
       "        f += 'f_' + (i - 1) + '();';"
       "    f += ' }';"
       "    result.push(f);"
       "}"
       "result.push('return f_' + (n - 1) + ';');"
       "result.push('})()');"
       "var ok = eval(result.join('\\n'));");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* ok_object =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "ok");
   CHECK(ok_object);
   const v8::HeapGraphNode* context_object =
       GetProperty(ok_object, v8::HeapGraphEdge::kInternal, "context");
   CHECK(context_object);
@@ skipping 13 matching lines @@
 
 
 TEST(AllocationSitesAreVisible) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();
   v8::HandleScope scope(isolate);
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
   CompileRun(
       "fun = function () { var a = [3, 2, 1]; return a; }\n"
       "fun();");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* fun_code =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "fun");
   CHECK(fun_code);
   const v8::HeapGraphNode* literals =
       GetProperty(fun_code, v8::HeapGraphEdge::kInternal, "literals");
   CHECK(literals);
@@ skipping 32 matching lines @@
   CHECK(v8::Integer::New(isolate, 1)
             ->Equals(array->Get(v8::Integer::New(isolate, 2))));
 }
 
 
 TEST(JSFunctionHasCodeLink) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("function foo(x, y) { return x + y; }\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* foo_func =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "foo");
   CHECK(foo_func);
   const v8::HeapGraphNode* code =
       GetProperty(foo_func, v8::HeapGraphEdge::kInternal, "code");
   CHECK(code);
 }
 
@@ skipping 20 matching lines @@
   }
   return node;
 }
 
 
 TEST(CheckCodeNames) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("var a = 1.1;");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("CheckCodeNames"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const char* stub_path[] = {
     "::(GC roots)",
     "::(Strong roots)",
     "code_stubs::",
     "::(ArraySingleArgumentConstructorStub code)"
   };
   const v8::HeapGraphNode* node = GetNodeByPath(snapshot,
       stub_path, arraysize(stub_path));
@@ skipping 237 matching lines @@
   CHECK_GE(node->allocation_size(), 4 * node->allocation_count());
   heap_profiler->StopTrackingHeapObjects();
 }
 
 
 TEST(ArrayBufferAndArrayBufferView) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun("arr1 = new Uint32Array(100);\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* arr1_obj =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "arr1");
   CHECK(arr1_obj);
   const v8::HeapGraphNode* arr1_buffer =
       GetProperty(arr1_obj, v8::HeapGraphEdge::kInternal, "buffer");
   CHECK(arr1_buffer);
   const v8::HeapGraphNode* first_view =
       GetProperty(arr1_buffer, v8::HeapGraphEdge::kWeak, "weak_first_view");
@@ skipping 37 matching lines @@
   DCHECK(data != NULL);
   v8::Local<v8::ArrayBuffer> ab2 =
       v8::ArrayBuffer::New(isolate, data, ab_contents.ByteLength());
   CHECK(ab2->IsExternal());
   env->Global()->Set(v8_str("ab1"), ab);
   env->Global()->Set(v8_str("ab2"), ab2);
 
   v8::Handle<v8::Value> result = CompileRun("ab2.byteLength");
   CHECK_EQ(1024, result->Int32Value());
 
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* ab1_node =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "ab1");
   CHECK(ab1_node);
   const v8::HeapGraphNode* ab1_data =
       GetProperty(ab1_node, v8::HeapGraphEdge::kInternal, "backing_store");
   CHECK(ab1_data);
   const v8::HeapGraphNode* ab2_node =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "ab2");
@@ skipping 13 matching lines @@
   LocalContext env;
   v8::Handle<v8::Object> global_proxy = env->Global();
   v8::Handle<v8::Object> global = global_proxy->GetPrototype().As<v8::Object>();
 
   i::Factory* factory = CcTest::i_isolate()->factory();
   i::Handle<i::String> string = factory->NewStringFromStaticChars("string");
   i::Handle<i::Object> box = factory->NewBox(string);
   global->Set(0, v8::ToApiHandle<v8::Object>(box));
 
   v8::HeapProfiler* heap_profiler = isolate->GetHeapProfiler();
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global_node = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* box_node =
       GetProperty(global_node, v8::HeapGraphEdge::kElement, "0");
   CHECK(box_node);
   v8::String::Utf8Value box_node_name(box_node->GetName());
   CHECK_EQ(0, strcmp("system / Box", *box_node_name));
   const v8::HeapGraphNode* box_value =
       GetProperty(box_node, v8::HeapGraphEdge::kInternal, "value");
   CHECK(box_value);
 }
 
 
 TEST(WeakContainers) {
   i::FLAG_allow_natives_syntax = true;
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   if (!CcTest::i_isolate()->use_crankshaft()) return;
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   CompileRun(
       "function foo(a) { return a.x; }\n"
       "obj = {x : 123};\n"
       "foo(obj);\n"
       "foo(obj);\n"
       "%OptimizeFunctionOnNextCall(foo);\n"
       "foo(obj);\n");
-  const v8::HeapSnapshot* snapshot =
-      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   const v8::HeapGraphNode* obj =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "obj");
   CHECK(obj);
   const v8::HeapGraphNode* map =
       GetProperty(obj, v8::HeapGraphEdge::kInternal, "map");
   CHECK(map);
   const v8::HeapGraphNode* dependent_code =
       GetProperty(map, v8::HeapGraphEdge::kInternal, "dependent_code");
@@ skipping 58 matching lines @@
   map.AddRange(ToAddress(0x180), 0x80, 6U);
   map.AddRange(ToAddress(0x180), 0x80, 7U);
   CHECK_EQ(7u, map.GetTraceNodeId(ToAddress(0x180)));
   CHECK_EQ(5u, map.GetTraceNodeId(ToAddress(0x200)));
   CHECK_EQ(3u, map.size());
 
   map.Clear();
   CHECK_EQ(0u, map.size());
   CHECK_EQ(0u, map.GetTraceNodeId(ToAddress(0x400)));
 }