Patch for allowing several V8 instances in process:...

src/v8-counters.h

 // Copyright 2007-2008 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 140 matching lines @@
   SC(reloc_info_count, V8.RelocInfoCount)                           \
   SC(reloc_info_size, V8.RelocInfoSize)                             \
   SC(zone_segment_bytes, V8.ZoneSegmentBytes)                       \
   SC(compute_entry_frame, V8.ComputeEntryFrame)                     \
   SC(generic_binary_stub_calls, V8.GenericBinaryStubCalls)          \
   SC(generic_binary_stub_calls_regs, V8.GenericBinaryStubCallsRegs) \
   SC(string_add_runtime, V8.StringAddRuntime)                       \
   SC(string_add_native, V8.StringAddNative)
 
 // This file contains all the v8 counters that are in use.
-class Counters : AllStatic {
+class Counters {
  public:
 #define HT(name, caption) \
-  static HistogramTimer name;
+  HistogramTimer name;
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define SC(name, caption) \
-  static StatsCounter name;
+  StatsCounter name;
   STATS_COUNTER_LIST_1(SC)
   STATS_COUNTER_LIST_2(SC)
 #undef SC
 
   enum Id {
 #define RATE_ID(name, caption) k_##name,
     HISTOGRAM_TIMER_LIST(RATE_ID)
 #undef RATE_ID
 #define COUNTER_ID(name, caption) k_##name,
   STATS_COUNTER_LIST_1(COUNTER_ID)
   STATS_COUNTER_LIST_2(COUNTER_ID)
 #undef COUNTER_ID
 #define COUNTER_ID(name) k_##name,
   STATE_TAG_LIST(COUNTER_ID)
 #undef COUNTER_ID
     stats_counter_count
   };
 
   // Sliding state window counters.
-  static StatsCounter state_counters[];
+  StatsCounter* const state_counters;
+ private:
+  Counters();
+  friend class V8Context;
+  DISALLOW_COPY_AND_ASSIGN(Counters);
 };
 
+#define COUNTER(name) v8::v8_context()->counters_.name
+#define INC_COUNTER(name) COUNTER(name).Increment()
+#define DEC_COUNTER(name) COUNTER(name).Decrement()
+#define INCREMENT_COUNTER(name, amount) COUNTER(name).Increment(amount)
+#define DECREMENT_COUNTER(name, amount) COUNTER(name).Decrement(amount)
 } }  // namespace v8::internal
 
 #endif  // V8_V8_COUNTERS_H_