include/smalloc.h

   1 /*
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  38
  39 #ifndef _smalloc_h
  40 #define _smalloc_h
  41 #include "visibility.h"
  42 #include <stdlib.h>
  43
  44 /*
  45  * Memory allocation routines in gromacs:
  46  *
  47  * If an allocation fails, the program is halted by means of the
  48  * fatal_error routine, which outputs source file and line number
  49  * and the name of the variable involved.
  50  *
  51  * Macro's which can be used:
  52  *
  53  * snew(ptr,nelem)
  54  *    Allocates memory for nelem elements and returns this in ptr.
  55  *    The allocated memory is initialized to zeros.
  56  *
  57  * srenew(ptr,nelem)
  58  *    Reallocates memory for nelem elements and returns this in ptr.
  59  *
  60  * smalloc(ptr,size)
  61  *    Allocates memory for size bytes and returns this in ptr.
  62  *
  63  * scalloc(ptr,nelem,elsize)
  64  *    Allocates memory for nelem elements of size elsize and returns
  65  *    this in ptr.
  66  *
  67  * srealloc(ptr,size)
  68  *    Reallocates memory for size bytes and returns this in ptr.
  69  *
  70  * sfree(ptr)
  71  *    Frees memory referenced by ptr.
  72  *
  73  * snew_aligned(ptr,nelem,alignment)
  74  *    Allocates memory for nelem elements and returns this in ptr.
  75  *    The allocated memory is initialized to zeroes.
  76  *    alignment=n will constrain ptr to be n-byte aligned.
  77  *    This pointer should only be freed with sfree_aligned, since
  78  *    it may not be the value returned by the underlying malloc.
  79  *
  80  * sfree_aligned(ptr)
  81  *    Frees aligned memory referenced by ptr.
  82  *
  83  ****************************************************************************
  84  *
  85  * Functions which are used by the macro's:
  86  *
  87  * extern void *save_malloc(char *name,char *file,int line,int size);
  88  *    Like alloc, returns a pointer to the allocated space, uses name, file
  89  *    and line to generate an error message when allocation failed.
  90  *
  91  * extern void *save_calloc(char *name,char *file,int line,
  92  *                          size_t nelem,size_t elsize);
  93  *    Like calloc, returns a pointer to the allocated space, uses name, file
  94  *    and line to generate an error message when allocation failed.
  95  *
  96  * extern void *save_realloc(char *name,char *file,int line,
  97  *                           void *ptr,size_t size);
  98  *    Like realloc, returns a pointer to the allocated space, uses name, file
  99  *    and line to generate an error message when allocation failed.
 100  *    If ptr equals NULL, malloc is called in stead of realloc, in this way
 101  *    it is possible to combine first and later allocations.
 102  *
 103  * extern void save_free(char *name,char *file,int line, void *ptr);
 104  *    Like free, uses name, file and line to generate an error message when
 105  *    the free failed.
 106  *
 107  * extern size_t maxavail();
 108  *    Returns the maximum available allocation unit, by applying a binary
 109  *    search on the largest block of memory available. After allocation
 110  *    it invokes free to restore the original state. So it is important
 111  *    that free can undo the effect of a malloc.
 112  *
 113  * extern size_t memavail();
 114  *    Returns the total of available allocation unit, by applying maxavail
 115  *    until no space is left, it then frees all allocated space and returns
 116  *    the sum of the previously allocated space. As mentioned with maxavail,
 117  *    it is important that free can undo the effect of a malloc.
 118  *
 119  * extern void *save_malloc_aligned(char *name,char *file,int line,size_t size,size_t alignment);
 120  *    Like alloc, returns a pointer to the allocated space, uses name, file
 121  *    and line to generate an error message when allocation failed.
 122  *    The returned pointer will be n-byte aligned, where n=alignment.
 123  *    The pointer should only be freed with a call to save_free.
 124  *
 125  * extern void save_free_aligned(char *name,char *file,int line, void *ptr);
 126  *    Like free, uses name, file and line to generate an error message when
 127  *    the free failed. This function is intended to be called for
 128  *    pointers allocated with save_malloc_aligned, and may not work
 129  *    on normal pointers.
 130  */
 131
 132 #ifdef __cplusplus
 133 extern "C" {
 134 #endif
 135
 136 GMX_LIBGMX_EXPORT
 137 void *save_malloc(const char *name, const char *file, int line, size_t size);
 138 GMX_LIBGMX_EXPORT
 139 void *save_calloc(const char *name, const char *file, int line,
 140                   size_t nelem, size_t elsize);
 141 GMX_LIBGMX_EXPORT
 142 void *save_realloc(const char *name, const char *file, int line,
 143                    void *ptr, size_t nelem, size_t elsize);
 144 GMX_LIBGMX_EXPORT
 145 void save_free(const char *name, const char *file, int line, void *ptr);
 146 size_t maxavail(void);
 147 size_t memavail(void);
 148
 149 /* Aligned-memory counterparts */
 150
 151 GMX_LIBGMX_EXPORT
 152 void *save_malloc_aligned(const char *name, const char *file, int line,
 153                           unsigned nelem, size_t elsize, size_t alignment);
 154 GMX_LIBGMX_EXPORT
 155 void *save_calloc_aligned(const char *name, const char *file, int line,
 156                           unsigned nelem, size_t elsize, size_t alignment);
 157 GMX_LIBGMX_EXPORT
 158 void save_free_aligned(const char *name, const char *file, int line, void *ptr);
 159
 160 #ifdef __cplusplus
 161 }
 162
 163 /* Use of sizeof(T) in _snew() and _srenew() can cause obscure bugs if
 164  * several files define distinct data structures with identical names and
 165  * allocate memory for them using the macros below.
 166  * For this reason, the size of an element is passed as a parameter.
 167  *
 168  * The C versions work fine in such cases, but when compiled with a C++
 169  * compiler (and if the compiler does not inline the calls), the linker cannot
 170  * tell that data structures with identical names are actually different and
 171  * links calls to these template functions incorrectly, which can result in
 172  * allocation of an incorrect amount of memory if the element size is computed
 173  * within the function. Even with the size passed as a parameter, incorrect
 174  * linkage will occur, but as the type is now only present in the cast, it
 175  * should not cause problems.
 176  */
 177 template <typename T>
 178 void _snew(const char *name, const char *file, int line,
 179            T * &ptr, size_t nelem, size_t elsize)
 180 {
 181     ptr = (T *)save_calloc(name, file, line, nelem, elsize);
 182 }
 183 template <typename T>
 184 void _srenew(const char *name, const char *file, int line,
 185              T * &ptr, size_t nelem, size_t elsize)
 186 {
 187     ptr = (T *)save_realloc(name, file, line, ptr, nelem, elsize);
 188 }
 189 template <typename T>
 190 void _smalloc(const char *name, const char *file, int line, T * &ptr, size_t size)
 191 {
 192     ptr = (T *)save_malloc(name, file, line, size);
 193 }
 194 template <typename T>
 195 void _srealloc(const char *name, const char *file, int line, T * &ptr, size_t size)
 196 {
 197     ptr = (T *)save_realloc(name, file, line, ptr, size, sizeof(char));
 198 }
 199 template <typename T>
 200 void _snew_aligned(const char *name, const char *file, int line,
 201                    T * &ptr, size_t nelem, size_t elsize, size_t alignment)
 202 {
 203     ptr = (T *)save_calloc_aligned(name, file, line, nelem, elsize, alignment);
 204 }
 205
 206 #define snew(ptr, nelem) _snew(#ptr, __FILE__, __LINE__, (ptr), (nelem), sizeof(*(ptr)))
 207 #define srenew(ptr, nelem) _srenew(#ptr, __FILE__, __LINE__, (ptr), (nelem), sizeof(*(ptr)))
 208 #define smalloc(ptr, size) _smalloc(#ptr, __FILE__, __LINE__, (ptr), (size))
 209 #define srealloc(ptr, size) _srealloc(#ptr, __FILE__, __LINE__, (ptr), (size))
 210 #define snew_aligned(ptr, nelem, alignment) _snew_aligned(#ptr, __FILE__, __LINE__, (ptr), (nelem), sizeof(*(ptr)), alignment)
 211
 212 #else
 213
 214 /* These macros work in C, not in C++ */
 215 #define snew(ptr, nelem) (ptr) = save_calloc(#ptr, __FILE__, __LINE__, \
 216                                              (nelem), sizeof(*(ptr)))
 217 #define srenew(ptr, nelem) (ptr) = save_realloc(#ptr, __FILE__, __LINE__, \
 218                                                 (ptr), (nelem), sizeof(*(ptr)))
 219 #define smalloc(ptr, size) (ptr) = save_malloc(#ptr, __FILE__, __LINE__, size)
 220 #define scalloc(ptr, nelem, elsize) \
 221     (ptr) = save_calloc(#ptr, __FILE__, __LINE__, nelem, elsize)
 222 #define srealloc(ptr, size) (ptr) = save_realloc(#ptr, __FILE__, __LINE__, \
 223                                                  (ptr), size, 1)
 224 #define snew_aligned(ptr, nelem, alignment) (ptr) = save_calloc_aligned(#ptr, __FILE__, __LINE__, (nelem), sizeof(*(ptr)), alignment)
 225 #endif
 226
 227 #define sfree(ptr) save_free(#ptr, __FILE__, __LINE__, (ptr))
 228
 229 /* call this ONLY with a pointer obtained through snew_aligned or
 230    smalloc_aligned: */
 231 #define sfree_aligned(ptr) save_free_aligned(#ptr, __FILE__, __LINE__, (ptr))
 232
 233 #endif  /* _smalloc_h */