nuclear@3: /************************************************************************************
nuclear@3: 
nuclear@3: Filename    :   OVR_Allocator.cpp
nuclear@3: Content     :   Installable memory allocator implementation
nuclear@3: Created     :   September 19, 2012
nuclear@3: Notes       : 
nuclear@3: 
nuclear@3: Copyright   :   Copyright 2012 Oculus VR, Inc. All Rights reserved.
nuclear@3: 
nuclear@3: Use of this software is subject to the terms of the Oculus license
nuclear@3: agreement provided at the time of installation or download, or which
nuclear@3: otherwise accompanies this software in either electronic or hard copy form.
nuclear@3: 
nuclear@3: ************************************************************************************/
nuclear@3: 
nuclear@3: #include "OVR_Allocator.h"
nuclear@3: #ifdef OVR_OS_MAC
nuclear@3:  #include <stdlib.h>
nuclear@3: #else
nuclear@3:  #include <malloc.h>
nuclear@3: #endif
nuclear@3: 
nuclear@3: namespace OVR {
nuclear@3: 
nuclear@3: //-----------------------------------------------------------------------------------
nuclear@3: // ***** Allocator
nuclear@3: 
nuclear@3: Allocator* Allocator::pInstance = 0;
nuclear@3: 
nuclear@3: // Default AlignedAlloc implementation will delegate to Alloc/Free after doing rounding.
nuclear@3: void* Allocator::AllocAligned(UPInt size, UPInt align)
nuclear@3: {
nuclear@3:     OVR_ASSERT((align & (align-1)) == 0);
nuclear@3:     align = (align > sizeof(UPInt)) ? align : sizeof(UPInt);
nuclear@3:     UPInt p = (UPInt)Alloc(size+align);
nuclear@3:     UPInt aligned = 0;
nuclear@3:     if (p)
nuclear@3:     {
nuclear@3:         aligned = (UPInt(p) + align-1) & ~(align-1);
nuclear@3:         if (aligned == p) 
nuclear@3:             aligned += align;
nuclear@3:         *(((UPInt*)aligned)-1) = aligned-p;
nuclear@3:     }
nuclear@3:     return (void*)aligned;
nuclear@3: }
nuclear@3: 
nuclear@3: void Allocator::FreeAligned(void* p)
nuclear@3: {
nuclear@3:     UPInt src = UPInt(p) - *(((UPInt*)p)-1);
nuclear@3:     Free((void*)src);
nuclear@3: }
nuclear@3: 
nuclear@3: 
nuclear@3: //------------------------------------------------------------------------
nuclear@3: // ***** Default Allocator
nuclear@3: 
nuclear@3: // This allocator is created and used if no other allocator is installed.
nuclear@3: // Default allocator delegates to system malloc.
nuclear@3: 
nuclear@3: void* DefaultAllocator::Alloc(UPInt size)
nuclear@3: {
nuclear@3:     return malloc(size);
nuclear@3: }
nuclear@3: void* DefaultAllocator::AllocDebug(UPInt size, const char* file, unsigned line)
nuclear@3: {
nuclear@3: #if defined(OVR_CC_MSVC) && defined(_CRTDBG_MAP_ALLOC)
nuclear@3:     return _malloc_dbg(size, _NORMAL_BLOCK, file, line);
nuclear@3: #else
nuclear@3:     OVR_UNUSED2(file, line);
nuclear@3:     return malloc(size);
nuclear@3: #endif
nuclear@3: }
nuclear@3: 
nuclear@3: void* DefaultAllocator::Realloc(void* p, UPInt newSize)
nuclear@3: {
nuclear@3:     return realloc(p, newSize);
nuclear@3: }
nuclear@3: void DefaultAllocator::Free(void *p)
nuclear@3: {
nuclear@3:     return free(p);
nuclear@3: }
nuclear@3: 
nuclear@3: 
nuclear@3: } // OVR