Add FLAG_trace_maps

src/isolate.h

 // 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.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 1091 matching lines @@
   void SetUseCounterCallback(v8::Isolate::UseCounterCallback callback);
   void CountUsage(v8::Isolate::UseCounterFeature feature);
 
   BasicBlockProfiler* GetOrCreateBasicBlockProfiler();
   BasicBlockProfiler* basic_block_profiler() { return basic_block_profiler_; }
 
   static Isolate* NewForTesting() { return new Isolate(false); }
 
   std::string GetTurboCfgFileName();
 
+#if TRACE_MAPS
+  int GetNextUniqueSharedFunctionInfoId() { return next_unique_sfi_id_++; }
+#endif
+
  private:
   explicit Isolate(bool enable_serializer);
 
   friend struct GlobalState;
   friend struct InitializeGlobalState;
 
   // These fields are accessed through the API, offsets must be kept in sync
   // with v8::internal::Internals (in include/v8.h) constants. This is also
   // verified in Isolate::Init() using runtime checks.
   void* embedder_data_[Internals::kNumIsolateDataSlots];
@@ skipping 182 matching lines @@
 #endif
 
   DeferredHandles* deferred_handles_head_;
   OptimizingCompilerThread* optimizing_compiler_thread_;
 
   // Counts deopt points if deopt_every_n_times is enabled.
   unsigned int stress_deopt_count_;
 
   int next_optimization_id_;
 
+#if TRACE_MAPS
+  int next_unique_sfi_id_;
+#endif
+
   // List of callbacks when a Call completes.
   List<CallCompletedCallback> call_completed_callbacks_;
 
   v8::Isolate::UseCounterCallback use_counter_callback_;
   BasicBlockProfiler* basic_block_profiler_;
 
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class IsolateInitializer;
   friend class OptimizingCompilerThread;
@@ skipping 214 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_