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

src/log-inl.h

 // Copyright 2006-2009 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 51 matching lines @@
 
   disabled_ = false;
 #if !defined(ENABLE_HEAP_PROTECTION)
   // When not protecting the heap, there is no difference between
   // EXTERNAL and OTHER.  As an optimization in that case, we will not
   // perform EXTERNAL->OTHER transitions through the API.  We thus
   // compress the two states into one.
   if (state == EXTERNAL) state = OTHER;
 #endif
   state_ = state;
-  previous_ = Logger::current_state_;
-  Logger::current_state_ = this;
+  LoggerData& data = v8_context()->logger_data_;
+  previous_ = data.current_state_;
+  data.current_state_ = this;
 
   if (FLAG_log_state_changes) {
     LOG(UncheckedStringEvent("Entering", StateToString(state_)));
     if (previous_ != NULL) {
       LOG(UncheckedStringEvent("From", StateToString(previous_->state_)));
     }
   }
 
 #ifdef ENABLE_HEAP_PROTECTION
   if (FLAG_protect_heap && previous_ != NULL) {
     if (state_ == EXTERNAL) {
       // We are leaving V8.
       ASSERT(previous_->state_ != EXTERNAL);
       Heap::Protect();
     } else if (previous_->state_ == EXTERNAL) {
       // We are entering V8.
       Heap::Unprotect();
     }
   }
 #endif
 }
 
 
 VMState::~VMState() {
   if (disabled_) return;
-  Logger::current_state_ = previous_;
+  v8_context()->logger_data_.current_state_ = previous_;
 
   if (FLAG_log_state_changes) {
     LOG(UncheckedStringEvent("Leaving", StateToString(state_)));
     if (previous_ != NULL) {
       LOG(UncheckedStringEvent("To", StateToString(previous_->state_)));
     }
   }
 
 #ifdef ENABLE_HEAP_PROTECTION
   if (FLAG_protect_heap && previous_ != NULL) {
     if (state_ == EXTERNAL) {
       // We are reentering V8.
       ASSERT(previous_->state_ != EXTERNAL);
       Heap::Unprotect();
     } else if (previous_->state_ == EXTERNAL) {
       // We are leaving V8.
       Heap::Protect();
     }
   }
 #endif
 }
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_INL_H_