// Copyright 2018 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. #ifndef V8_OBJECTS_FREE_SPACE_H_ #define V8_OBJECTS_FREE_SPACE_H_ #include "src/objects/heap-object.h" #include "torque-generated/class-definitions-tq.h" // Has to be the last include (doesn't have include guards): #include "src/objects/object-macros.h" namespace v8 { namespace internal { // FreeSpace are fixed-size free memory blocks used by the heap and GC. // They look like heap objects (are heap object tagged and have a map) so that // the heap remains iterable. They have a size and a next pointer. // The next pointer is the raw address of the next FreeSpace object (or NULL) // in the free list. class FreeSpace : public TorqueGeneratedFreeSpace<FreeSpace, HeapObject> { public: // [size]: size of the free space including the header. inline int relaxed_read_size() const; inline void relaxed_write_size(int value); inline int Size(); // Accessors for the next field. inline FreeSpace next(); inline void set_next(FreeSpace next); inline static FreeSpace cast(HeapObject obj); inline static FreeSpace unchecked_cast(const Object obj); // Dispatched behavior. DECL_PRINTER(FreeSpace) private: inline bool IsValid(); TQ_OBJECT_CONSTRUCTORS(FreeSpace) }; } // namespace internal } // namespace v8 #include "src/objects/object-macros-undef.h" #endif // V8_OBJECTS_FREE_SPACE_H_