Link type feedback vectors to the shared function info.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 2738 matching lines @@
   set_experimental_extra_natives_source_cache(
       *factory->NewFixedArray(ExperimentalExtraNatives::GetBuiltinsCount()));
 
   set_undefined_cell(*factory->NewCell(factory->undefined_value()));
 
   // Microtask queue uses the empty fixed array as a sentinel for "empty".
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
   set_microtask_queue(empty_fixed_array());
 
   {
-    // Create a canonical empty FeedbackVector, which is shared by all
-    // functions that don't need actual type feedback slots. Note however
-    // that all these functions will share the same invocation count, but
-    // that shouldn't matter since we only use the invocation count to
-    // relativize the absolute call counts, but we can only have call counts
-    // if we have actual feedback slots.
-    Handle<FixedArray> empty_feedback_vector =
-        factory->NewFixedArray(FeedbackVector::kReservedIndexCount, TENURED);
-    empty_feedback_vector->set(FeedbackVector::kMetadataIndex,
-                               empty_fixed_array());
-    empty_feedback_vector->set(FeedbackVector::kInvocationCountIndex,
-                               Smi::kZero);
-    empty_feedback_vector->set_map(feedback_vector_map());
-    set_empty_feedback_vector(*empty_feedback_vector);
-  }
-
-  {
     Handle<FixedArray> empty_sloppy_arguments_elements =
         factory->NewFixedArray(2, TENURED);
     empty_sloppy_arguments_elements->set_map(sloppy_arguments_elements_map());
     set_empty_sloppy_arguments_elements(*empty_sloppy_arguments_elements);
   }
 
   {
     Handle<WeakCell> cell = factory->NewWeakCell(factory->undefined_value());
     set_empty_weak_cell(*cell);
     cell->clear();
@@ skipping 145 matching lines @@
 #undef SMI_ENTRY
     // String table
     case kStringTableRootIndex:
       return true;
 
     default:
       return false;
   }
 }
 
-
 bool Heap::RootCanBeTreatedAsConstant(RootListIndex root_index) {
   return !RootCanBeWrittenAfterInitialization(root_index) &&
          !InNewSpace(root(root_index));
 }
 
 bool Heap::IsUnmodifiedHeapObject(Object** p) {
   Object* object = *p;
   if (object->IsSmi()) return false;
   HeapObject* heap_object = HeapObject::cast(object);
   if (!object->IsJSObject()) return false;
@@ skipping 3619 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8