Add FLAG_trace_maps

src/isolate.cc

 // Copyright 2012 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 <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 1632 matching lines @@
       serializer_enabled_(enable_serializer),
       has_fatal_error_(false),
       initialized_from_snapshot_(false),
       cpu_profiler_(NULL),
       heap_profiler_(NULL),
       function_entry_hook_(NULL),
       deferred_handles_head_(NULL),
       optimizing_compiler_thread_(NULL),
       stress_deopt_count_(0),
       next_optimization_id_(0),
+#if TRACE_MAPS
+      next_unique_sfi_id_(0),
+#endif
       use_counter_callback_(NULL),
       basic_block_profiler_(NULL) {
   {
     base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
     CHECK(thread_data_table_);
   }
   id_ = base::NoBarrier_AtomicIncrement(&isolate_counter_, 1);
   TRACE_ISOLATE(constructor);
 
   memset(isolate_addresses_, 0,
@@ skipping 686 matching lines @@
     Handle<Map> map = factory()->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
     Handle<JSObject> registry = factory()->NewJSObjectFromMap(map);
     heap()->set_symbol_registry(*registry);
 
     static const char* nested[] = {
       "for", "for_api", "for_intern", "keyFor", "private_api", "private_intern"
     };
     for (unsigned i = 0; i < arraysize(nested); ++i) {
       Handle<String> name = factory()->InternalizeUtf8String(nested[i]);
       Handle<JSObject> obj = factory()->NewJSObjectFromMap(map);
-      JSObject::NormalizeProperties(obj, KEEP_INOBJECT_PROPERTIES, 8);
+      JSObject::NormalizeProperties(obj, KEEP_INOBJECT_PROPERTIES, 8,
+                                    "SetupSymbolRegistry");
       JSObject::SetProperty(registry, name, obj, STRICT).Assert();
     }
   }
   return Handle<JSObject>::cast(factory()->symbol_registry());
 }
 
 
 void Isolate::AddCallCompletedCallback(CallCompletedCallback callback) {
   for (int i = 0; i < call_completed_callbacks_.length(); i++) {
     if (callback == call_completed_callbacks_.at(i)) return;
@@ skipping 166 matching lines @@
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal