src/v8/src/type-feedback-vector.h

   1 // Copyright 2014 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef V8_TYPE_FEEDBACK_VECTOR_H_
   6 #define V8_TYPE_FEEDBACK_VECTOR_H_
   7
   8 #include "src/checks.h"
   9 #include "src/elements-kind.h"
  10 #include "src/heap/heap.h"
  11 #include "src/isolate.h"
  12 #include "src/objects.h"
  13
  14 namespace v8 {
  15 namespace internal {
  16
  17 class TypeFeedbackVector : public FixedArray {
  18  public:
  19   // Casting.
  20   static TypeFeedbackVector* cast(Object* obj) {
  21     DCHECK(obj->IsTypeFeedbackVector());
  22     return reinterpret_cast<TypeFeedbackVector*>(obj);
  23   }
  24
  25   static Handle<TypeFeedbackVector> Copy(Isolate* isolate,
  26                                          Handle<TypeFeedbackVector> vector);
  27
  28   // The object that indicates an uninitialized cache.
  29   static inline Handle<Object> UninitializedSentinel(Isolate* isolate);
  30
  31   // The object that indicates a megamorphic state.
  32   static inline Handle<Object> MegamorphicSentinel(Isolate* isolate);
  33
  34   // The object that indicates a premonomorphic state.
  35   static inline Handle<Object> PremonomorphicSentinel(Isolate* isolate);
  36
  37   // The object that indicates a generic state.
  38   static inline Handle<Object> GenericSentinel(Isolate* isolate);
  39
  40   // The object that indicates a monomorphic state of Array with
  41   // ElementsKind
  42   static inline Handle<Object> MonomorphicArraySentinel(
  43       Isolate* isolate, ElementsKind elements_kind);
  44
  45   // A raw version of the uninitialized sentinel that's safe to read during
  46   // garbage collection (e.g., for patching the cache).
  47   static inline Object* RawUninitializedSentinel(Heap* heap);
  48
  49  private:
  50   DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackVector);
  51 };
  52 }
  53 }  // namespace v8::internal
  54
  55 #endif  // V8_TRANSITIONS_H_