Line data    Source code

       1             : // Copyright 2018 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_OBJECTS_FEEDBACK_CELL_H_
       6             : #define V8_OBJECTS_FEEDBACK_CELL_H_
       7             : 
       8             : #include "src/objects/struct.h"
       9             : 
      10             : // Has to be the last include (doesn't have include guards):
      11             : #include "src/objects/object-macros.h"
      12             : 
      13             : namespace v8 {
      14             : namespace internal {
      15             : 
      16             : // This is a special cell used to maintain both the link between a
      17             : // closure and it's feedback vector, as well as a way to count the
      18             : // number of closures created for a certain function per native
      19             : // context. There's at most one FeedbackCell for each function in
      20             : // a native context.
      21             : class FeedbackCell : public Struct {
      22             :  public:
      23             :   // [value]: value of the cell.
      24             :   DECL_ACCESSORS(value, HeapObject)
      25             : 
      26             :   DECL_CAST(FeedbackCell)
      27             : 
      28             :   // Dispatched behavior.
      29             :   DECL_PRINTER(FeedbackCell)
      30             :   DECL_VERIFIER(FeedbackCell)
      31             : 
      32             : // Layout description.
      33             : #define FEEDBACK_CELL_FIELDS(V) \
      34             :   V(kValueOffset, kTaggedSize)  \
      35             :   /* Total size. */             \
      36             :   V(kSize, 0)
      37             : 
      38             :   DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize, FEEDBACK_CELL_FIELDS)
      39             : #undef FEEDBACK_CELL_FIELDS
      40             : 
      41             :   typedef FixedBodyDescriptor<kValueOffset, kSize, kSize> BodyDescriptor;
      42             : 
      43     9452753 :   OBJECT_CONSTRUCTORS(FeedbackCell, Struct);
      44             : };
      45             : 
      46             : }  // namespace internal
      47             : }  // namespace v8
      48             : 
      49             : #include "src/objects/object-macros-undef.h"
      50             : 
      51             : #endif  // V8_OBJECTS_FEEDBACK_CELL_H_