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Side by Side Diff: src/objects.h

Issue 882443004: Revert of Only use FreeSpace objects in the free list. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 11 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_OBJECTS_H_ 5 #ifndef V8_OBJECTS_H_
6 #define V8_OBJECTS_H_ 6 #define V8_OBJECTS_H_
7 7
8 #include <iosfwd> 8 #include <iosfwd>
9 9
10 #include "src/allocation.h" 10 #include "src/allocation.h"
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4441 // Maximal memory consumption for a single ByteArray. 4441 // Maximal memory consumption for a single ByteArray.
4442 static const int kMaxSize = 512 * MB; 4442 static const int kMaxSize = 512 * MB;
4443 // Maximal length of a single ByteArray. 4443 // Maximal length of a single ByteArray.
4444 static const int kMaxLength = kMaxSize - kHeaderSize; 4444 static const int kMaxLength = kMaxSize - kHeaderSize;
4445 4445
4446 private: 4446 private:
4447 DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray); 4447 DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray);
4448 }; 4448 };
4449 4449
4450 4450
4451 // FreeSpace are fixed-size free memory blocks used by the heap and GC. 4451 // FreeSpace represents fixed sized areas of the heap that are not currently in
4452 // They look like heap objects (are heap object tagged and have a map) so that 4452 // use. Used by the heap and GC.
4453 // the heap remains iterable. They have a size and a next pointer.
4454 // The next pointer is the raw address of the next FreeSpace object (or NULL)
4455 // in the free list.
4456 class FreeSpace: public HeapObject { 4453 class FreeSpace: public HeapObject {
4457 public: 4454 public:
4458 // [size]: size of the free space including the header. 4455 // [size]: size of the free space including the header.
4459 inline int size() const; 4456 inline int size() const;
4460 inline void set_size(int value); 4457 inline void set_size(int value);
4461 4458
4462 inline int nobarrier_size() const; 4459 inline int nobarrier_size() const;
4463 inline void nobarrier_set_size(int value); 4460 inline void nobarrier_set_size(int value);
4464 4461
4465 inline int Size() { return size(); } 4462 inline int Size() { return size(); }
4466 4463
4467 // Accessors for the next field. 4464 DECLARE_CAST(FreeSpace)
4468 inline FreeSpace* next();
4469 inline FreeSpace** next_address();
4470 inline void set_next(FreeSpace* next);
4471
4472 inline static FreeSpace* cast(HeapObject* obj);
4473 4465
4474 // Dispatched behavior. 4466 // Dispatched behavior.
4475 DECLARE_PRINTER(FreeSpace) 4467 DECLARE_PRINTER(FreeSpace)
4476 DECLARE_VERIFIER(FreeSpace) 4468 DECLARE_VERIFIER(FreeSpace)
4477 4469
4478 // Layout description. 4470 // Layout description.
4479 // Size is smi tagged when it is stored. 4471 // Size is smi tagged when it is stored.
4480 static const int kSizeOffset = HeapObject::kHeaderSize; 4472 static const int kSizeOffset = HeapObject::kHeaderSize;
4481 static const int kNextOffset = POINTER_SIZE_ALIGN(kSizeOffset + kPointerSize); 4473 static const int kHeaderSize = kSizeOffset + kPointerSize;
4474
4475 static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize);
4482 4476
4483 private: 4477 private:
4484 DISALLOW_IMPLICIT_CONSTRUCTORS(FreeSpace); 4478 DISALLOW_IMPLICIT_CONSTRUCTORS(FreeSpace);
4485 }; 4479 };
4486 4480
4487 4481
4488 // V has parameters (Type, type, TYPE, C type, element_size) 4482 // V has parameters (Type, type, TYPE, C type, element_size)
4489 #define TYPED_ARRAYS(V) \ 4483 #define TYPED_ARRAYS(V) \
4490 V(Uint8, uint8, UINT8, uint8_t, 1) \ 4484 V(Uint8, uint8, UINT8, uint8_t, 1) \
4491 V(Int8, int8, INT8, int8_t, 1) \ 4485 V(Int8, int8, INT8, int8_t, 1) \
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10939 } else { 10933 } else {
10940 value &= ~(1 << bit_position); 10934 value &= ~(1 << bit_position);
10941 } 10935 }
10942 return value; 10936 return value;
10943 } 10937 }
10944 }; 10938 };
10945 10939
10946 } } // namespace v8::internal 10940 } } // namespace v8::internal
10947 10941
10948 #endif // V8_OBJECTS_H_ 10942 #endif // V8_OBJECTS_H_
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