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1 /************************************************************************************
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2
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3 Filename : OVR_Allocator.cpp
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4 Content : Installable memory allocator implementation
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5 Created : September 19, 2012
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6 Notes :
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7
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8 Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
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9
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10 Use of this software is subject to the terms of the Oculus license
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11 agreement provided at the time of installation or download, or which
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12 otherwise accompanies this software in either electronic or hard copy form.
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13
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14 ************************************************************************************/
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15
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16 #include "OVR_Allocator.h"
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17 #ifdef OVR_OS_MAC
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18 #include <stdlib.h>
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19 #else
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20 #include <malloc.h>
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21 #endif
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22
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23 namespace OVR {
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24
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25 //-----------------------------------------------------------------------------------
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26 // ***** Allocator
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27
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28 Allocator* Allocator::pInstance = 0;
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29
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30 // Default AlignedAlloc implementation will delegate to Alloc/Free after doing rounding.
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31 void* Allocator::AllocAligned(UPInt size, UPInt align)
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32 {
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33 OVR_ASSERT((align & (align-1)) == 0);
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34 align = (align > sizeof(UPInt)) ? align : sizeof(UPInt);
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35 UPInt p = (UPInt)Alloc(size+align);
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36 UPInt aligned = 0;
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37 if (p)
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38 {
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39 aligned = (UPInt(p) + align-1) & ~(align-1);
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40 if (aligned == p)
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41 aligned += align;
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42 *(((UPInt*)aligned)-1) = aligned-p;
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43 }
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44 return (void*)aligned;
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45 }
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46
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47 void Allocator::FreeAligned(void* p)
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48 {
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49 UPInt src = UPInt(p) - *(((UPInt*)p)-1);
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50 Free((void*)src);
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51 }
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52
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53
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54 //------------------------------------------------------------------------
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55 // ***** Default Allocator
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56
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57 // This allocator is created and used if no other allocator is installed.
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58 // Default allocator delegates to system malloc.
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59
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60 void* DefaultAllocator::Alloc(UPInt size)
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61 {
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62 return malloc(size);
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63 }
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64 void* DefaultAllocator::AllocDebug(UPInt size, const char* file, unsigned line)
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65 {
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66 #if defined(OVR_CC_MSVC) && defined(_CRTDBG_MAP_ALLOC)
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67 return _malloc_dbg(size, _NORMAL_BLOCK, file, line);
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68 #else
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69 OVR_UNUSED2(file, line);
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70 return malloc(size);
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71 #endif
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72 }
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73
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74 void* DefaultAllocator::Realloc(void* p, UPInt newSize)
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75 {
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76 return realloc(p, newSize);
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77 }
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78 void DefaultAllocator::Free(void *p)
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79 {
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80 return free(p);
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81 }
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82
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83
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84 } // OVR
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