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

2

3 Filename : OVR_Allocator.cpp

4 Content : Installable memory allocator implementation

5 Created : September 19, 2012

6 Notes :

7

8 Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.

9

10 Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");

11 you may not use the Oculus VR Rift SDK except in compliance with the License,

12 which is provided at the time of installation or download, or which

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

14

15 You may obtain a copy of the License at

16

17 http://www.oculusvr.com/licenses/LICENSE-3.2

18

19 Unless required by applicable law or agreed to in writing, the Oculus VR SDK

20 distributed under the License is distributed on an "AS IS" BASIS,

21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

22 See the License for the specific language governing permissions and

23 limitations under the License.

24

25 ************************************************************************************/

26

27 #include "OVR_Allocator.h"

28 #ifdef OVR_OS_MAC

29 #include <stdlib.h>

30 #else

31 #include <malloc.h>

32 #endif

33

34 #if defined(OVR_OS_MS)

35 #include <Windows.h>

36 #elif defined(OVR_OS_MAC) || defined(OVR_OS_UNIX)

37 #include <unistd.h>

38 #include <sys/mman.h>

39 #endif

40

41

42 namespace OVR {

43

44 //-----------------------------------------------------------------------------------

45 // ***** Allocator

46

47 Allocator* Allocator::pInstance = 0;

48

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

50 void* Allocator::AllocAligned(size_t size, size_t align)

51 {

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

53 align = (align > sizeof(size_t)) ? align : sizeof(size_t);

54 size_t p = (size_t)Alloc(size+align);

55 size_t aligned = 0;

56 if (p)

57 {

58 aligned = (size_t(p) + align-1) & ~(align-1);

59 if (aligned == p)

60 aligned += align;

61 *(((size_t*)aligned)-1) = aligned-p;

62 }

63 return (void*)aligned;

64 }

65

66 void Allocator::FreeAligned(void* p)

67 {

68 size_t src = size_t(p) - *(((size_t*)p)-1);

69 Free((void*)src);

70 }

71

72

73 //------------------------------------------------------------------------

74 // ***** Default Allocator

75

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

77 // Default allocator delegates to system malloc.

78

79 void* DefaultAllocator::Alloc(size_t size)

80 {

81 return malloc(size);

82 }

83 void* DefaultAllocator::AllocDebug(size_t size, const char* file, unsigned line)

84 {

85 OVR_UNUSED2(file, line); // should be here for debugopt config

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

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

88 #else

89 return malloc(size);

90 #endif

91 }

92

93 void* DefaultAllocator::Realloc(void* p, size_t newSize)

94 {

95 return realloc(p, newSize);

96 }

97 void DefaultAllocator::Free(void *p)

98 {

99 return free(p);

100 }

101

102

103

104

105 void* MMapAlloc(size_t size)

106 {

107 #if defined(OVR_OS_MS)

108 return VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE); // size is rounded up to a page. // Returned memory is 0-filled.

109

110 #elif defined(OVR_OS_MAC) || defined(OVR_OS_UNIX)

111 #if !defined(MAP_FAILED)

112 #define MAP_FAILED ((void*)-1)

113 #endif

114

115 void* result = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); // Returned memory is 0-filled.

116 if(result == MAP_FAILED) // mmap returns MAP_FAILED (-1) upon failure.

117 result = NULL;

118 return result;

119 #endif

120 }

121

122

123

124

125 void MMapFree(void* memory, size_t size)

126 {

127 #if defined(OVR_OS_MS)

128 OVR_UNUSED(size);

129 VirtualFree(memory, 0, MEM_RELEASE);

130

131 #elif defined(OVR_OS_MAC) || defined(OVR_OS_UNIX)

132 size_t pageSize = getpagesize();

133 size = (((size + (pageSize - 1)) / pageSize) * pageSize);

134 munmap(memory, size); // Must supply the size to munmap.

135 #endif

136 }

137

138

139

140

141 } // OVR