Source/core/platform/Arena.h - Issue 16896019: Replace RenderArena with PartitionAlloc.

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Issue 16896019: Replace RenderArena with PartitionAlloc. (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Created 7 years, 6 months ago

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1 /*

2 * Copyright (C) 1998-2000 Netscape Communications Corporation.

3 * Copyright (C) 2003-6 Apple Computer

4 * Copyright (C) Research In Motion Limited 2010. All rights reserved.

5 *

6 * Other contributors:

7 * Nick Blievers <nickb@adacel.com.au>

8 * Jeff Hostetler <jeff@nerdone.com>

9 * Tom Rini <trini@kernel.crashing.org>

10 * Raffaele Sena <raff@netwinder.org>

11 *

12 * This library is free software; you can redistribute it and/or

13 * modify it under the terms of the GNU Lesser General Public

14 * License as published by the Free Software Foundation; either

15 * version 2.1 of the License, or (at your option) any later version.

16 *

17 * This library is distributed in the hope that it will be useful,

18 * but WITHOUT ANY WARRANTY; without even the implied warranty of

19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

20 * Lesser General Public License for more details.

21 *

22 * You should have received a copy of the GNU Lesser General Public

23 * License along with this library; if not, write to the Free Software

24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 US A

25 *

26 * Alternatively, the contents of this file may be used under the terms

27 * of either the Mozilla Public License Version 1.1, found at

28 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public

29 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html

30 * (the "GPL"), in which case the provisions of the MPL or the GPL are

31 * applicable instead of those above. If you wish to allow use of your

32 * version of this file only under the terms of one of those two

33 * licenses (the MPL or the GPL) and not to allow others to use your

34 * version of this file under the LGPL, indicate your decision by

35 * deletingthe provisions above and replace them with the notice and

36 * other provisions required by the MPL or the GPL, as the case may be.

37 * If you do not delete the provisions above, a recipient may use your

38 * version of this file under any of the LGPL, the MPL or the GPL.

39 */

40

41 #ifndef Arena_h

42 #define Arena_h

43

44 // FIXME: We'd always like to use AllocAlignmentInteger for Arena alignment

45 // but there is concern over the memory growth this may cause.

46 #ifdef WTF_USE_ARENA_ALLOC_ALIGNMENT_INTEGER

47 #define ARENA_ALIGN_MASK (sizeof(WTF::AllocAlignmentInteger) - 1)

48 #else

49 #define ARENA_ALIGN_MASK 3

50 #endif

51

52 namespace WebCore {

53

54 typedef uintptr_t uword;

55

56 struct Arena {

57 Arena* next; // next arena

58 uword base; // aligned base address

59 uword limit; // end of arena (1+last byte)

60 uword avail; // points to next available byte in arena

61 };

62

63 struct ArenaPool {

64 Arena first; // first arena in pool list.

65 Arena* current; // current arena.

66 unsigned int arenasize;

67 uword mask; // Mask (power-of-2 - 1)

68 };

69

70 void InitArenaPool(ArenaPool, const char name, unsigned int size, unsigned int align);

71 void FinishArenaPool(ArenaPool*);

72 void* ArenaAllocate(ArenaPool*, unsigned int numBytes, unsigned int& bytesAlloca ted);

73

74 #define ARENA_ALIGN(n) (((uword)(n) + ARENA_ALIGN_MASK) & ~ARENA_ALIGN_MASK)

75 #define INIT_ARENA_POOL(pool, name, size) InitArenaPool(pool, name, size, ARENA_ ALIGN_MASK + 1)

76 #define ARENA_ALLOCATE(p, pool, nb, bytesAllocated) \

77 Arena* _a = (pool)->current; \

78 unsigned int _nb = ARENA_ALIGN(nb); \

79 uword _p = _a->avail; \

80 uword _q = _p + _nb; \

81 if (_q > _a->limit) \

82 _p = (uword)ArenaAllocate(pool, _nb, *bytesAllocated); \

83 else \

84 _a->avail = _q; \

85 p = (void*)_p;

86

87 }

88

89 #endif

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