Continued fix for 351257. Reusing the feedback vector is too complex.

src/objects.cc

 // Copyright 2013 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 10622 matching lines @@
     if (target->is_inline_cache_stub()) {
       if (kind == NULL || *kind == target->kind()) {
         IC::Clear(this->GetIsolate(), info->pc(),
                   info->host()->constant_pool());
       }
     }
   }
 }
 
 
-void Code::ClearTypeFeedbackInfo(Heap* heap) {
-  if (kind() != FUNCTION) return;
-  Object* raw_info = type_feedback_info();
-  if (raw_info->IsTypeFeedbackInfo()) {
-    FixedArray* feedback_vector =
-        TypeFeedbackInfo::cast(raw_info)->feedback_vector();
-    for (int i = 0; i < feedback_vector->length(); i++) {
-      Object* obj = feedback_vector->get(i);
-      if (!obj->IsAllocationSite()) {
-        // TODO(mvstanton): Can't I avoid a write barrier for this sentinel?
-        feedback_vector->set(i,
-                             TypeFeedbackInfo::RawUninitializedSentinel(heap));
-      }
+void SharedFunctionInfo::ClearTypeFeedbackInfo(Heap* heap) {
+  FixedArray* vector = feedback_vector();
+  for (int i = 0; i < vector->length(); i++) {
+    Object* obj = vector->get(i);
+    if (!obj->IsAllocationSite()) {
+      // The assert verifies we can skip the write barrier.
+      ASSERT(heap->uninitialized_symbol() ==
+             TypeFeedbackInfo::RawUninitializedSentinel(heap));
+      vector->set(i, TypeFeedbackInfo::RawUninitializedSentinel(heap),
+                  SKIP_WRITE_BARRIER);
     }
   }
 }
 
 
 BailoutId Code::TranslatePcOffsetToAstId(uint32_t pc_offset) {
   DisallowHeapAllocation no_gc;
   ASSERT(kind() == FUNCTION);
   BackEdgeTable back_edges(this, &no_gc);
   for (uint32_t i = 0; i < back_edges.length(); i++) {
@@ skipping 5815 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal