Optimize functions on a second thread.

src/v8.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 88 matching lines @@
   has_fatal_error_ = true;
 }
 
 
 void V8::TearDown() {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate->IsDefaultIsolate());
 
   if (!has_been_set_up_ || has_been_disposed_) return;
 
+  // The isolate has to be torn down before clearing the LOperand
+  // caches so that the optimizing compiler thread (if running)
+  // doesn't see an inconsistent view of the lithium instructions.
+  isolate->TearDown();
+  delete isolate;
+
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();
   RegisteredExtension::UnregisterAll();
 
-  isolate->TearDown();
-  delete isolate;
-
   is_running_ = false;
   has_been_disposed_ = true;
 
   delete call_completed_callbacks_;
   call_completed_callbacks_ = NULL;
 
   OS::TearDown();
 }
 
 
@@ skipping 153 matching lines @@
   SetUpJSCallerSavedCodeData();
   SamplerRegistry::SetUp();
   ExternalReference::SetUp();
 }
 
 void V8::InitializeOncePerProcess() {
   CallOnce(&init_once, &InitializeOncePerProcessImpl);
 }
 
 } }  // namespace v8::internal