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stack_alloc.h (6798B)


      1 /* Copyright (C) 2002-2003 Jean-Marc Valin
      2   Copyright (C) 2007-2009 Xiph.Org Foundation */
      3 /**
      4   @file stack_alloc.h
      5   @brief Temporary memory allocation on stack
      6 */
      7 /*
      8   Redistribution and use in source and binary forms, with or without
      9   modification, are permitted provided that the following conditions
     10   are met:
     11 
     12   - Redistributions of source code must retain the above copyright
     13   notice, this list of conditions and the following disclaimer.
     14 
     15   - Redistributions in binary form must reproduce the above copyright
     16   notice, this list of conditions and the following disclaimer in the
     17   documentation and/or other materials provided with the distribution.
     18 
     19   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     23   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     24   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     25   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     26   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     27   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 */
     31 
     32 #ifndef STACK_ALLOC_H
     33 #define STACK_ALLOC_H
     34 
     35 #include "opus_types.h"
     36 #include "opus_defines.h"
     37 
     38 #if (!defined (VAR_ARRAYS) && !defined (USE_ALLOCA) && !defined (NONTHREADSAFE_PSEUDOSTACK))
     39 #error "Opus requires one of VAR_ARRAYS, USE_ALLOCA, or NONTHREADSAFE_PSEUDOSTACK be defined to select the temporary allocation mode."
     40 #endif
     41 
     42 #ifdef USE_ALLOCA
     43 # ifdef _WIN32
     44 #  include <malloc.h>
     45 # else
     46 #  ifdef HAVE_ALLOCA_H
     47 #   include <alloca.h>
     48 #  else
     49 #   include <stdlib.h>
     50 #  endif
     51 # endif
     52 #endif
     53 
     54 /**
     55 * @def ALIGN(stack, size)
     56 *
     57 * Aligns the stack to a 'size' boundary
     58 *
     59 * @param stack Stack
     60 * @param size  New size boundary
     61 */
     62 
     63 /**
     64 * @def PUSH(stack, size, type)
     65 *
     66 * Allocates 'size' elements of type 'type' on the stack
     67 *
     68 * @param stack Stack
     69 * @param size  Number of elements
     70 * @param type  Type of element
     71 */
     72 
     73 /**
     74 * @def VARDECL(var)
     75 *
     76 * Declare variable on stack
     77 *
     78 * @param var Variable to declare
     79 */
     80 
     81 /**
     82 * @def ALLOC(var, size, type)
     83 *
     84 * Allocate 'size' elements of 'type' on stack
     85 *
     86 * @param var  Name of variable to allocate
     87 * @param size Number of elements
     88 * @param type Type of element
     89 */
     90 
     91 #if defined(VAR_ARRAYS)
     92 
     93 #define VARDECL(type, var)
     94 #define ALLOC(var, size, type) type var[size]
     95 #define SAVE_STACK
     96 #define RESTORE_STACK
     97 #define ALLOC_STACK
     98 /* C99 does not allow VLAs of size zero */
     99 #define ALLOC_NONE 1
    100 
    101 #elif defined(USE_ALLOCA)
    102 
    103 #define VARDECL(type, var) type *var
    104 
    105 # ifdef _WIN32
    106 #  define ALLOC(var, size, type) var = ((type*)_alloca(sizeof(type)*(size)))
    107 # else
    108 #  define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))
    109 # endif
    110 
    111 #define SAVE_STACK
    112 #define RESTORE_STACK
    113 #define ALLOC_STACK
    114 #define ALLOC_NONE 0
    115 
    116 #else
    117 
    118 #ifdef CELT_C
    119 char *scratch_ptr=0;
    120 char *global_stack=0;
    121 #else
    122 extern char *global_stack;
    123 extern char *scratch_ptr;
    124 #endif /* CELT_C */
    125 
    126 #if __STDC_VERSION__ >= 201112L
    127 #  include <stdalign.h>
    128 #  define ALIGNOF(T) alignof(T)
    129 #elif defined(__GNUC__) || defined(__clang__)
    130 #  define ALIGNOF(T) __alignof__(T)
    131 #else
    132 # include <stddef.h>
    133 # ifdef __cplusplus
    134 template <typename T>
    135 struct alignment_helper {
    136    char c;
    137    T member;
    138 };
    139 # define ALIGNOF(T) (offsetof(alignment_helper<T>, member))
    140 # else
    141 # define ALIGNOF(T) (offsetof(struct { char c; T member; }, member))
    142 # endif
    143 #endif
    144 
    145 #ifdef ENABLE_VALGRIND
    146 
    147 #include <valgrind/memcheck.h>
    148 
    149 #ifdef CELT_C
    150 char *global_stack_top=0;
    151 #else
    152 extern char *global_stack_top;
    153 #endif /* CELT_C */
    154 
    155 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
    156 #define PUSH(stack, size, type) (VALGRIND_MAKE_MEM_NOACCESS(stack, global_stack_top-stack),ALIGN((stack),ALIGNOF(type)),VALGRIND_MAKE_MEM_UNDEFINED(stack, ((size)*sizeof(type)/sizeof(char))),(stack)+=(2*(size)*sizeof(type)/sizeof(char)),(type*)((stack)-(2*(size)*sizeof(type)/sizeof(char))))
    157 #define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack))
    158 #define ALLOC_STACK char *_saved_stack; ((global_stack = (global_stack==0) ? ((global_stack_top=(char*)opus_alloc_scratch(GLOBAL_STACK_SIZE*2)+(GLOBAL_STACK_SIZE*2))-(GLOBAL_STACK_SIZE*2)) : global_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack)); _saved_stack = global_stack;
    159 
    160 #else
    161 
    162 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
    163 #ifdef ENABLE_HARDENING
    164 #include "arch.h"
    165 #define PUSH(stack, size, type) (ALIGN((stack),ALIGNOF(type)),(void)(((int)((size)*(sizeof(type)/(sizeof(char)))) <= (scratch_ptr)+GLOBAL_STACK_SIZE-(stack))?0:CELT_FATAL("pseudostack overflow")),(stack)+=(size)*(sizeof(type)/(sizeof(char))),(type*)(void*)((stack)-(size)*(sizeof(type)/(sizeof(char)))))
    166 #else
    167 #define PUSH(stack, size, type) (ALIGN((stack),ALIGNOF(type)),(stack)+=(size)*(sizeof(type)/(sizeof(char))),(type*)(void*)((stack)-(size)*(sizeof(type)/(sizeof(char)))))
    168 #endif
    169 
    170 #if 0 /* Set this to 1 to instrument pseudostack usage */
    171 #define RESTORE_STACK (printf("%ld %s:%d\n", global_stack-scratch_ptr, __FILE__, __LINE__),global_stack = _saved_stack)
    172 #else
    173 #define RESTORE_STACK (global_stack = _saved_stack)
    174 #endif
    175 #define ALLOC_STACK char *_saved_stack; (global_stack = (global_stack==0) ? (scratch_ptr=(char*)opus_alloc_scratch(GLOBAL_STACK_SIZE)) : global_stack); _saved_stack = global_stack;
    176 
    177 #endif /* ENABLE_VALGRIND */
    178 
    179 #include "os_support.h"
    180 #define VARDECL(type, var) type *var
    181 #define ALLOC(var, size, type) var = PUSH(global_stack, size, type)
    182 #define SAVE_STACK char *_saved_stack = global_stack;
    183 #define ALLOC_NONE 0
    184 
    185 #endif /* VAR_ARRAYS */
    186 
    187 
    188 #ifdef ENABLE_VALGRIND
    189 
    190 #include <valgrind/memcheck.h>
    191 #define OPUS_CHECK_ARRAY(ptr, len) VALGRIND_CHECK_MEM_IS_DEFINED(ptr, len*sizeof(*ptr))
    192 #define OPUS_CHECK_VALUE(value) VALGRIND_CHECK_VALUE_IS_DEFINED(value)
    193 #define OPUS_CHECK_ARRAY_COND(ptr, len) VALGRIND_CHECK_MEM_IS_DEFINED(ptr, len*sizeof(*ptr))
    194 #define OPUS_CHECK_VALUE_COND(value) VALGRIND_CHECK_VALUE_IS_DEFINED(value)
    195 #define OPUS_PRINT_INT(value) do {fprintf(stderr, #value " = %d at %s:%d\n", value, __FILE__, __LINE__);}while(0)
    196 #define OPUS_FPRINTF fprintf
    197 
    198 #else
    199 
    200 static OPUS_INLINE int _opus_false(void) {return 0;}
    201 #define OPUS_CHECK_ARRAY(ptr, len) _opus_false()
    202 #define OPUS_CHECK_VALUE(value) _opus_false()
    203 #define OPUS_PRINT_INT(value) do{}while(0)
    204 #define OPUS_FPRINTF (void)
    205 
    206 #endif
    207 
    208 
    209 #endif /* STACK_ALLOC_H */