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_FREE_SPACE_H_
6#define V8_OBJECTS_FREE_SPACE_H_
7
8#include "src/objects/heap-object.h"
9
10// Has to be the last include (doesn't have include guards):
11#include "src/objects/object-macros.h"
12
13namespace v8 {
14namespace internal {
15
16#include "torque-generated/src/objects/free-space-tq.inc"
17
18// FreeSpace are fixed-size free memory blocks used by the heap and GC.
19// They look like heap objects (are heap object tagged and have a map) so that
20// the heap remains iterable.  They have a size and a next pointer.
21// The next pointer is the raw address of the next FreeSpace object (or NULL)
22// in the free list.
23class FreeSpace : public TorqueGeneratedFreeSpace<FreeSpace, HeapObject> {
24 public:
25  // [size]: size of the free space including the header.
26  DECL_RELAXED_SMI_ACCESSORS(size)
27
28  inline int Size();
29
30  // Accessors for the next field.
31  inline FreeSpace next();
32  inline void set_next(FreeSpace next);
33
34  inline static FreeSpace cast(HeapObject obj);
35  inline static FreeSpace unchecked_cast(const Object obj);
36
37  // Dispatched behavior.
38  DECL_PRINTER(FreeSpace)
39
40  class BodyDescriptor;
41
42 private:
43  inline bool IsValid();
44
45  TQ_OBJECT_CONSTRUCTORS(FreeSpace)
46};
47
48}  // namespace internal
49}  // namespace v8
50
51#include "src/objects/object-macros-undef.h"
52
53#endif  // V8_OBJECTS_FREE_SPACE_H_
54