src/external/pcre2-10.32/src/pcre2_jit_misc.c

   1 /*************************************************
   2 *      Perl-Compatible Regular Expressions       *
   3 *************************************************/
   4
   5 /* PCRE is a library of functions to support regular expressions whose syntax
   6 and semantics are as close as possible to those of the Perl 5 language.
   7
   8                        Written by Philip Hazel
   9      Original API code Copyright (c) 1997-2012 University of Cambridge
  10          New API code Copyright (c) 2016 University of Cambridge
  11
  12 -----------------------------------------------------------------------------
  13 Redistribution and use in source and binary forms, with or without
  14 modification, are permitted provided that the following conditions are met:
  15
  16     * Redistributions of source code must retain the above copyright notice,
  17       this list of conditions and the following disclaimer.
  18
  19     * Redistributions in binary form must reproduce the above copyright
  20       notice, this list of conditions and the following disclaimer in the
  21       documentation and/or other materials provided with the distribution.
  22
  23     * Neither the name of the University of Cambridge nor the names of its
  24       contributors may be used to endorse or promote products derived from
  25       this software without specific prior written permission.
  26
  27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37 POSSIBILITY OF SUCH DAMAGE.
  38 -----------------------------------------------------------------------------
  39 */
  40
  41
  42 #ifndef INCLUDED_FROM_PCRE2_JIT_COMPILE
  43 #error This file must be included from pcre2_jit_compile.c.
  44 #endif
  45
  46
  47
  48 /*************************************************
  49 *           Free JIT read-only data              *
  50 *************************************************/
  51
  52 void
  53 PRIV(jit_free_rodata)(void *current, void *allocator_data)
  54 {
  55 #ifndef SUPPORT_JIT
  56 (void)current;
  57 (void)allocator_data;
  58 #else  /* SUPPORT_JIT */
  59 void *next;
  60
  61 SLJIT_UNUSED_ARG(allocator_data);
  62
  63 while (current != NULL)
  64   {
  65   next = *(void**)current;
  66   SLJIT_FREE(current, allocator_data);
  67   current = next;
  68   }
  69
  70 #endif /* SUPPORT_JIT */
  71 }
  72
  73 /*************************************************
  74 *           Free JIT compiled code               *
  75 *************************************************/
  76
  77 void
  78 PRIV(jit_free)(void *executable_jit, pcre2_memctl *memctl)
  79 {
  80 #ifndef SUPPORT_JIT
  81 (void)executable_jit;
  82 (void)memctl;
  83 #else  /* SUPPORT_JIT */
  84
  85 executable_functions *functions = (executable_functions *)executable_jit;
  86 void *allocator_data = memctl;
  87 int i;
  88
  89 for (i = 0; i < JIT_NUMBER_OF_COMPILE_MODES; i++)
  90   {
  91   if (functions->executable_funcs[i] != NULL)
  92     sljit_free_code(functions->executable_funcs[i]);
  93   PRIV(jit_free_rodata)(functions->read_only_data_heads[i], allocator_data);
  94   }
  95
  96 SLJIT_FREE(functions, allocator_data);
  97
  98 #endif /* SUPPORT_JIT */
  99 }
 100
 101
 102 /*************************************************
 103 *            Free unused JIT memory              *
 104 *************************************************/
 105
 106 PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
 107 pcre2_jit_free_unused_memory(pcre2_general_context *gcontext)
 108 {
 109 #ifndef SUPPORT_JIT
 110 (void)gcontext;     /* Suppress warning */
 111 #else  /* SUPPORT_JIT */
 112 SLJIT_UNUSED_ARG(gcontext);
 113 sljit_free_unused_memory_exec();
 114 #endif  /* SUPPORT_JIT */
 115 }
 116
 117
 118
 119 /*************************************************
 120 *            Allocate a JIT stack                *
 121 *************************************************/
 122
 123 PCRE2_EXP_DEFN pcre2_jit_stack * PCRE2_CALL_CONVENTION
 124 pcre2_jit_stack_create(size_t startsize, size_t maxsize,
 125   pcre2_general_context *gcontext)
 126 {
 127 #ifndef SUPPORT_JIT
 128
 129 (void)gcontext;
 130 (void)startsize;
 131 (void)maxsize;
 132 return NULL;
 133
 134 #else  /* SUPPORT_JIT */
 135
 136 pcre2_jit_stack *jit_stack;
 137
 138 if (startsize < 1 || maxsize < 1)
 139   return NULL;
 140 if (startsize > maxsize)
 141   startsize = maxsize;
 142 startsize = (startsize + STACK_GROWTH_RATE - 1) & ~(STACK_GROWTH_RATE - 1);
 143 maxsize = (maxsize + STACK_GROWTH_RATE - 1) & ~(STACK_GROWTH_RATE - 1);
 144
 145 jit_stack = PRIV(memctl_malloc)(sizeof(pcre2_real_jit_stack), (pcre2_memctl *)gcontext);
 146 if (jit_stack == NULL) return NULL;
 147 jit_stack->stack = sljit_allocate_stack(startsize, maxsize, &jit_stack->memctl);
 148 return jit_stack;
 149
 150 #endif
 151 }
 152
 153
 154 /*************************************************
 155 *         Assign a JIT stack to a pattern        *
 156 *************************************************/
 157
 158 PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
 159 pcre2_jit_stack_assign(pcre2_match_context *mcontext, pcre2_jit_callback callback,
 160   void *callback_data)
 161 {
 162 #ifndef SUPPORT_JIT
 163 (void)mcontext;
 164 (void)callback;
 165 (void)callback_data;
 166 #else  /* SUPPORT_JIT */
 167
 168 if (mcontext == NULL) return;
 169 mcontext->jit_callback = callback;
 170 mcontext->jit_callback_data = callback_data;
 171
 172 #endif  /* SUPPORT_JIT */
 173 }
 174
 175
 176 /*************************************************
 177 *               Free a JIT stack                 *
 178 *************************************************/
 179
 180 PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
 181 pcre2_jit_stack_free(pcre2_jit_stack *jit_stack)
 182 {
 183 #ifndef SUPPORT_JIT
 184 (void)jit_stack;
 185 #else  /* SUPPORT_JIT */
 186 if (jit_stack != NULL)
 187   {
 188   sljit_free_stack((struct sljit_stack *)(jit_stack->stack), &jit_stack->memctl);
 189   jit_stack->memctl.free(jit_stack, jit_stack->memctl.memory_data);
 190   }
 191 #endif  /* SUPPORT_JIT */
 192 }
 193
 194
 195 /*************************************************
 196 *               Get target CPU type              *
 197 *************************************************/
 198
 199 const char*
 200 PRIV(jit_get_target)(void)
 201 {
 202 #ifndef SUPPORT_JIT
 203 return "JIT is not supported";
 204 #else  /* SUPPORT_JIT */
 205 return sljit_get_platform_name();
 206 #endif  /* SUPPORT_JIT */
 207 }
 208
 209
 210 /*************************************************
 211 *              Get size of JIT code              *
 212 *************************************************/
 213
 214 size_t
 215 PRIV(jit_get_size)(void *executable_jit)
 216 {
 217 #ifndef SUPPORT_JIT
 218 (void)executable_jit;
 219 return 0;
 220 #else  /* SUPPORT_JIT */
 221 sljit_uw *executable_sizes = ((executable_functions *)executable_jit)->executable_sizes;
 222 SLJIT_COMPILE_ASSERT(JIT_NUMBER_OF_COMPILE_MODES == 3, number_of_compile_modes_changed);
 223 return executable_sizes[0] + executable_sizes[1] + executable_sizes[2];
 224 #endif
 225 }
 226
 227 /* End of pcre2_jit_misc.c */