1 /************************************************************************************

2

3 Filename : OVR_Allocator.cpp

4 Content : Installable memory allocator implementation

5 Created : September 19, 2012

6 Notes :

7

8 Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.

9

10 Use of this software is subject to the terms of the Oculus license

11 agreement provided at the time of installation or download, or which

12 otherwise accompanies this software in either electronic or hard copy form.

13

14 ************************************************************************************/

15

16 #include "OVR_Allocator.h"

17 #ifdef OVR_OS_MAC

18 #include <stdlib.h>

19 #else

20 #include <malloc.h>

21 #endif

22

23 namespace OVR {

24

25 //-----------------------------------------------------------------------------------

26 // ***** Allocator

27

28 Allocator* Allocator::pInstance = 0;

29

30 // Default AlignedAlloc implementation will delegate to Alloc/Free after doing rounding.

31 void* Allocator::AllocAligned(UPInt size, UPInt align)

32 {

33 OVR_ASSERT((align & (align-1)) == 0);

34 align = (align > sizeof(UPInt)) ? align : sizeof(UPInt);

35 UPInt p = (UPInt)Alloc(size+align);

36 UPInt aligned = 0;

37 if (p)

38 {

39 aligned = (UPInt(p) + align-1) & ~(align-1);

40 if (aligned == p)

41 aligned += align;

42 *(((UPInt*)aligned)-1) = aligned-p;

43 }

44 return (void*)aligned;

45 }

46

47 void Allocator::FreeAligned(void* p)

48 {

49 UPInt src = UPInt(p) - *(((UPInt*)p)-1);

50 Free((void*)src);

51 }

52

53

54 //------------------------------------------------------------------------

55 // ***** Default Allocator

56

57 // This allocator is created and used if no other allocator is installed.

58 // Default allocator delegates to system malloc.

59

60 void* DefaultAllocator::Alloc(UPInt size)

61 {

62 return malloc(size);

63 }

64 void* DefaultAllocator::AllocDebug(UPInt size, const char* file, unsigned line)

65 {

66 #if defined(OVR_CC_MSVC) && defined(_CRTDBG_MAP_ALLOC)

67 return _malloc_dbg(size, _NORMAL_BLOCK, file, line);

68 #else

69 OVR_UNUSED2(file, line);

70 return malloc(size);

71 #endif

72 }

73

74 void* DefaultAllocator::Realloc(void* p, UPInt newSize)

75 {

76 return realloc(p, newSize);

77 }

78 void DefaultAllocator::Free(void *p)

79 {

80 return free(p);

81 }

82

83

84 } // OVR