Add FLAG_trace_maps

src/runtime/runtime-object.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/runtime/runtime.h"
@@ skipping 451 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_DisableAccessChecks) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(HeapObject, object, 0);
   Handle<Map> old_map(object->map());
   bool needs_access_checks = old_map->is_access_check_needed();
   if (needs_access_checks) {
     // Copy map so it won't interfere constructor's initial map.
-    Handle<Map> new_map = Map::Copy(old_map);
+    Handle<Map> new_map = Map::Copy(old_map, "DisableAccessChecks");
     new_map->set_is_access_check_needed(false);
     JSObject::MigrateToMap(Handle<JSObject>::cast(object), new_map);
   }
   return isolate->heap()->ToBoolean(needs_access_checks);
 }
 
 
 RUNTIME_FUNCTION(Runtime_EnableAccessChecks) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
   Handle<Map> old_map(object->map());
   RUNTIME_ASSERT(!old_map->is_access_check_needed());
   // Copy map so it won't interfere constructor's initial map.
-  Handle<Map> new_map = Map::Copy(old_map);
+  Handle<Map> new_map = Map::Copy(old_map, "EnableAccessChecks");
   new_map->set_is_access_check_needed(true);
   JSObject::MigrateToMap(object, new_map);
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
   CONVERT_SMI_ARG_CHECKED(properties, 1);
   // Conservative upper limit to prevent fuzz tests from going OOM.
   RUNTIME_ASSERT(properties <= 100000);
   if (object->HasFastProperties() && !object->IsJSGlobalProxy()) {
-    JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties);
+    JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties,
+                                  "OptimizeForAdding");
   }
   return *object;
 }
 
 
 RUNTIME_FUNCTION(Runtime_ObjectFreeze) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
 
@@ skipping 632 matching lines @@
   }
   return *isolate->factory()->NewJSArrayWithElements(copy);
 }
 
 
 RUNTIME_FUNCTION(Runtime_ToFastProperties) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   if (object->IsJSObject() && !object->IsGlobalObject()) {
-    JSObject::MigrateSlowToFast(Handle<JSObject>::cast(object), 0);
+    JSObject::MigrateSlowToFast(Handle<JSObject>::cast(object), 0,
+                                "RuntimeToFastProperties");
   }
   return *object;
 }
 
 
 RUNTIME_FUNCTION(Runtime_ToBool) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, object, 0);
 
@@ skipping 283 matching lines @@
   RUNTIME_ASSERT(IsValidAccessor(getter));
   CONVERT_ARG_HANDLE_CHECKED(Object, setter, 3);
   RUNTIME_ASSERT(IsValidAccessor(setter));
   CONVERT_SMI_ARG_CHECKED(unchecked, 4);
   RUNTIME_ASSERT((unchecked & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
   PropertyAttributes attr = static_cast<PropertyAttributes>(unchecked);
 
   bool fast = obj->HasFastProperties();
   RETURN_FAILURE_ON_EXCEPTION(
       isolate, JSObject::DefineAccessor(obj, name, getter, setter, attr));
-  if (fast) JSObject::MigrateSlowToFast(obj, 0);
+  if (fast) JSObject::MigrateSlowToFast(obj, 0, "RuntimeDefineAccessor");
   return isolate->heap()->undefined_value();
 }
 
 
 // Implements part of 8.12.9 DefineOwnProperty.
 // There are 3 cases that lead here:
 // Step 4a - define a new data property.
 // Steps 9b & 12 - replace an existing accessor property with a data property.
 // Step 12 - update an existing data property with a data or generic
 //           descriptor.
@@ skipping 108 matching lines @@
 
 RUNTIME_FUNCTION(RuntimeReference_ClassOf) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   if (!obj->IsJSReceiver()) return isolate->heap()->null_value();
   return JSReceiver::cast(obj)->class_name();
 }
 }
 }  // namespace v8::internal