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

src/usage-analyzer.cc

 // Copyright 2006-2008 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 401 matching lines @@
 WeightScaler::~WeightScaler() {
   uc_->weight_ = old_weight_;
 }
 
 
 // ----------------------------------------------------------------------------
 // Interface to variable usage analysis
 
 bool AnalyzeVariableUsage(FunctionLiteral* lit) {
   if (!FLAG_usage_computation) return true;
-  HistogramTimerScope timer(&Counters::usage_analysis);
+  HistogramTimerScope timer(&COUNTER(usage_analysis));
   return UsageComputer::Traverse(lit);
 }
 
 } }  // namespace v8::internal