Add a deoptimization count to each function to limit number of re-compilations.

src/runtime.cc

 // Copyright 2012 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 8446 matching lines @@
     has_other_activations = activations_finder.has_activations();
   }
 
   if (!has_other_activations) {
     if (FLAG_trace_deopt) {
       PrintF("[removing optimized code for: ");
       function->PrintName();
       PrintF("]\n");
     }
     function->ReplaceCode(function->shared()->code());
+
+    // Limit the number of times we re-compile a functions after deoptimization.
+    function->shared()->IncrementAndCheckDeoptCount();
   } else {
     Deoptimizer::DeoptimizeFunction(*function);
   }
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyOSR) {
   Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
   delete deoptimizer;
@@ skipping 42 matching lines @@
   }
   if (FLAG_always_opt) {
     return Smi::FromInt(3);  // 3 == "always".
   }
   CONVERT_ARG_CHECKED(JSFunction, function, 0);
   return function->IsOptimized() ? Smi::FromInt(1)   // 1 == "yes".
                                  : Smi::FromInt(2);  // 2 == "no".
 }
 
 
-RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOptimizationCount) {
+RUNTIME_FUNCTION(MaybeObject*, Runtime_GetDeoptimizationCount) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(JSFunction, function, 0);
-  return Smi::FromInt(function->shared()->opt_count());
+  return Smi::FromInt(function->shared()->deopt_count());
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(JSFunction, function, 0);
 
   // We're not prepared to handle a function with arguments object.
   ASSERT(!function->shared()->uses_arguments());
@@ skipping 5003 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags);
   }
 }
 
 
 } }  // namespace v8::internal