1 /*
2 Bullet Continuous Collision Detection and Physics Library
3 Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
4 
5 This software is provided 'as-is', without any express or implied warranty.
6 In no event will the authors be held liable for any damages arising from the use of this software.
7 Permission is granted to anyone to use this software for any purpose,
8 including commercial applications, and to alter it and redistribute it freely,
9 subject to the following restrictions:
10 
11 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
12 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
13 3. This notice may not be removed or altered from any source distribution.
14 */
15 
16 #ifndef BT_ALIGNED_ALLOCATOR
17 #define BT_ALIGNED_ALLOCATOR
18 
19 ///we probably replace this with our own aligned memory allocator
20 ///so we replace _aligned_malloc and _aligned_free with our own
21 ///that is better portable and more predictable
22 
23 #include "btScalar.h"
24 
25 ///BT_DEBUG_MEMORY_ALLOCATIONS preprocessor can be set in build system
26 ///for regression tests to detect memory leaks
27 ///#define BT_DEBUG_MEMORY_ALLOCATIONS 1
28 #ifdef BT_DEBUG_MEMORY_ALLOCATIONS
29 
30 int btDumpMemoryLeaks();
31 
32 #define btAlignedAlloc(a, b) \
33 	btAlignedAllocInternal(a, b, __LINE__, __FILE__)
34 
35 #define btAlignedFree(ptr) \
36 	btAlignedFreeInternal(ptr, __LINE__, __FILE__)
37 
38 void* btAlignedAllocInternal(size_t size, int alignment, int line, char* filename);
39 
40 void btAlignedFreeInternal(void* ptr, int line, char* filename);
41 
42 #else
43 void* btAlignedAllocInternal(size_t size, int alignment);
44 void btAlignedFreeInternal(void* ptr);
45 
46 #define btAlignedAlloc(size, alignment) btAlignedAllocInternal(size, alignment)
47 #define btAlignedFree(ptr) btAlignedFreeInternal(ptr)
48 
49 #endif
50 typedef int size_type;
51 
52 typedef void*(btAlignedAllocFunc)(size_t size, int alignment);
53 typedef void(btAlignedFreeFunc)(void* memblock);
54 typedef void*(btAllocFunc)(size_t size);
55 typedef void(btFreeFunc)(void* memblock);
56 
57 ///The developer can let all Bullet memory allocations go through a custom memory allocator, using btAlignedAllocSetCustom
58 void btAlignedAllocSetCustom(btAllocFunc* allocFunc, btFreeFunc* freeFunc);
59 ///If the developer has already an custom aligned allocator, then btAlignedAllocSetCustomAligned can be used. The default aligned allocator pre-allocates extra memory using the non-aligned allocator, and instruments it.
60 void btAlignedAllocSetCustomAligned(btAlignedAllocFunc* allocFunc, btAlignedFreeFunc* freeFunc);
61 
62 ///The btAlignedAllocator is a portable class for aligned memory allocations.
63 ///Default implementations for unaligned and aligned allocations can be overridden by a custom allocator using btAlignedAllocSetCustom and btAlignedAllocSetCustomAligned.
64 template <typename T, unsigned Alignment>
65 class btAlignedAllocator
66 {
67 	typedef btAlignedAllocator<T, Alignment> self_type;
68 
69 public:
70 	//just going down a list:
btAlignedAllocator()71 	btAlignedAllocator() {}
72 	/*
73 	btAlignedAllocator( const self_type & ) {}
74 	*/
75 
76 	template <typename Other>
btAlignedAllocator(const btAlignedAllocator<Other,Alignment> &)77 	btAlignedAllocator(const btAlignedAllocator<Other, Alignment>&)
78 	{
79 	}
80 
81 	typedef const T* const_pointer;
82 	typedef const T& const_reference;
83 	typedef T* pointer;
84 	typedef T& reference;
85 	typedef T value_type;
86 
address(reference ref)87 	pointer address(reference ref) const { return &ref; }
address(const_reference ref)88 	const_pointer address(const_reference ref) const { return &ref; }
89 	pointer allocate(size_type n, const_pointer* hint = 0)
90 	{
91 		(void)hint;
92 		return reinterpret_cast<pointer>(btAlignedAlloc(sizeof(value_type) * n, Alignment));
93 	}
construct(pointer ptr,const value_type & value)94 	void construct(pointer ptr, const value_type& value) { new (ptr) value_type(value); }
deallocate(pointer ptr)95 	void deallocate(pointer ptr)
96 	{
97 		btAlignedFree(reinterpret_cast<void*>(ptr));
98 	}
destroy(pointer ptr)99 	void destroy(pointer ptr) { ptr->~value_type(); }
100 
101 	template <typename O>
102 	struct rebind
103 	{
104 		typedef btAlignedAllocator<O, Alignment> other;
105 	};
106 	template <typename O>
107 	self_type& operator=(const btAlignedAllocator<O, Alignment>&)
108 	{
109 		return *this;
110 	}
111 
112 	friend bool operator==(const self_type&, const self_type&) { return true; }
113 };
114 
115 #endif  //BT_ALIGNED_ALLOCATOR
116