src/gras/DataDesc/ddt_convert.c

   1 /* $Id$ */
   2
   3 /* ddt_remote - Stuff needed to get datadescs about remote hosts            */
   4
   5 /* Copyright (c) 2003 Olivier Aumage.                                       */
   6 /* Copyright (c) 2003, 2004 Martin Quinson.                                 */
   7 /* All rights reserved.                                                     */
   8
   9 /* This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the license (GNU LGPL) which comes with this package. */
  11
  12 /************************************************************************/
  13 /* C combines the power of assembler with the portability of assembler. */
  14 /************************************************************************/
  15
  16 #include "gras/DataDesc/datadesc_private.h"
  17
  18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_ddt_convert,gras_ddt,
  19                                  "Inter-architecture convertions");
  20
  21 /***
  22  *** Table of all known architectures:
  23  ***
  24   l_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=0; gras_arch_name=little32;;
  25   l_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=1; gras_arch_name=little32_4;;
  26
  27   l_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=2; gras_arch_name=little64;;
  28
  29   B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=3; gras_arch_name=big32;;
  30   B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=4; gras_arch_name=big32_8_4;;
  31   B_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=5; gras_arch_name=big32_4;;
  32   B_C:1/1:_I:2/2:4/2:4/2:8/2:_P:4/2:4/2:_D:4/2:8/2:) gras_arch=6; gras_arch_name=big32_2;;
  33
  34   B_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=7; gras_arch_name=big64;;
  35
  36  ***/
  37
  38 const gras_arch_desc_t gras_arches[gras_arch_count] = {
  39   {"little32",   0, {1,2,4,4,8,   4,4,   4,8}, /* win32 */
  40                     {1,2,4,4,8,   4,4,   4,8}},
  41
  42   {"little32_4", 0, {1,2,4,4,8,   4,4,   4,8}, /* linux x86 */
  43                     {1,2,4,4,4,   4,4,   4,4}},
  44
  45   {"little64",   0, {1,2,4,8,8,   8,8,   4,8}, /* alpha, ia64 */
  46                     {1,2,4,8,8,   8,8,   4,8}},
  47
  48   {"big32",      1, {1,2,4,4,8,   4,4,   4,8},
  49                     {1,2,4,4,8,   4,4,   4,8}},
  50
  51   {"big32_8_4",  1, {1,2,4,4,8,   4,4,   4,8}, /* AIX */
  52                     {1,2,4,4,8,   4,4,   4,4}},
  53
  54   {"big32_4",    1, {1,2,4,4,8,   4,4,   4,8}, /* G5 */
  55                     {1,2,4,4,4,   4,4,   4,4}},
  56
  57   {"big32_2",    1, {1,2,4,4,8,   4,4,   4,8}, /* ARM */
  58                     {1,2,2,2,2,   2,2,   2,2}},
  59
  60   {"big64",      1, {1,2,4,8,8,   8,8,   4,8}, /* sparc */
  61                     {1,2,4,8,8,   8,8,   4,8}},
  62
  63   {"big64_8_4",  1, {1,2,4,8,8,   8,8,   4,8}, /* aix with -maix64 */
  64                     {1,2,4,8,8,   8,8,   4,4}}
  65 };
  66
  67 const char *gras_datadesc_arch_name(int code) {
  68    if (code < 0 || code >= gras_arch_count)
  69      return "[unknown arch]";
  70    return gras_arches[code].name;
  71 }
  72
  73
  74 /**
  75  * Local function doing the grunt work
  76  */
  77 static void
  78 gras_dd_reverse_bytes(void *to,
  79                       const void *from,
  80                       size_t length);
  81
  82 /**
  83  * gras_dd_convert_elm:
  84  *
  85  * Convert the element described by @type comming from architecture @r_arch.
  86  * The data to be converted is stored in @src, and is to be stored in @dst.
  87  * Both pointers may be the same location if no resizing is needed.
  88  */
  89 void
  90 gras_dd_convert_elm(gras_datadesc_type_t type, int count,
  91                     int r_arch,
  92                     void *src, void *dst) {
  93   gras_dd_cat_scalar_t scal = type->category.scalar_data;
  94   int cpt;
  95   const void *r_data;
  96   void *l_data;
  97   unsigned long r_size, l_size;
  98   /* Hexadecimal displayer
  99   union {
 100     char c[sizeof(int)];
 101     int i;
 102   } tester;
 103   */
 104
 105   xbt_assert(type->category_code == e_gras_datadesc_type_cat_scalar);
 106   xbt_assert(r_arch != GRAS_THISARCH);
 107
 108   r_size = type->size[r_arch];
 109   l_size = type->size[GRAS_THISARCH];
 110   DEBUG4("r_size=%lu l_size=%lu,    src=%p dst=%p",
 111          r_size,l_size,src,dst);
 112
 113   DEBUG2("remote=%c local=%c", gras_arches[r_arch].endian?'B':'l',
 114          gras_arches[GRAS_THISARCH].endian?'B':'l');
 115
 116   if(r_size != l_size) {
 117     for(cpt = 0, r_data = src, l_data = dst;
 118         cpt < count;
 119         cpt++,
 120           r_data = (char *)r_data + r_size,
 121           l_data = (char *)l_data + l_size) {
 122
 123       /*
 124       fprintf(stderr,"r_data=");
 125       for (cpt=0; cpt<r_size; cpt++) {
 126         tester.i=0;
 127         tester.c[0]= ((char*)r_data)[cpt];
 128         fprintf(stderr,"\\%02x", tester.i);
 129       }
 130       fprintf(stderr,"\n");
 131       */
 132
 133       /* Resize that damn integer, pal */
 134
 135       unsigned char *l_sign, *r_sign;
 136       int padding;
 137       int sizeChange = l_size - r_size;
 138       int lowOrderFirst = !gras_arches[r_arch].endian ||
 139         gras_arches[r_arch].endian == gras_arches[GRAS_THISARCH].endian;
 140
 141       DEBUG5("Resize integer %d from %lu @%p to %lu @%p",
 142              cpt, r_size,r_data, l_size,l_data);
 143       xbt_assert0(r_data != l_data, "Impossible to resize in place");
 144
 145       if(sizeChange < 0) {
 146         DEBUG3("Truncate %d bytes (%s,%s)", -sizeChange,
 147                lowOrderFirst?"lowOrderFirst":"bigOrderFirst",
 148                scal.encoding == e_gras_dd_scalar_encoding_sint?"signed":"unsigned");
 149         /* Truncate high-order bytes. */
 150         memcpy(l_data,
 151                gras_arches[r_arch].endian ? ((char*)r_data-sizeChange)
 152                                           :         r_data,
 153                l_size);
 154
 155         if(scal.encoding == e_gras_dd_scalar_encoding_sint) {
 156           DEBUG0("This is signed");
 157           /* Make sure the high order bit of r_data and l_data are the same */
 158           l_sign = gras_arches[GRAS_THISARCH].endian
 159                  ? ((unsigned char*)l_data + l_size - 1)
 160                  :  (unsigned char*)l_data;
 161           r_sign = gras_arches[r_arch].endian
 162                  ? ((unsigned char*)r_data + r_size - 1)
 163                  :  (unsigned char*)r_data;
 164           DEBUG2("This is signed (r_sign=%c l_sign=%c", *r_sign,*l_sign);
 165
 166           if ((*r_sign > 127) != (*l_sign > 127)) {
 167             if(*r_sign > 127)
 168               *l_sign += 128;
 169             else
 170               *l_sign -= 128;
 171           }
 172         }
 173       } else {
 174         DEBUG1("Extend %d bytes", sizeChange);
 175         if (scal.encoding != e_gras_dd_scalar_encoding_sint) {
 176           DEBUG0("This is signed");
 177           padding = 0; /* pad unsigned with 0 */
 178         } else {
 179           /* extend sign */
 180           r_sign = gras_arches[r_arch].endian ? ((unsigned char*)r_data + r_size - 1)
 181                                               :  (unsigned char*)r_data;
 182           padding = (*r_sign > 127) ? 0xff : 0;
 183         }
 184
 185         memset(l_data, padding, l_size);
 186         memcpy(!gras_arches[r_arch].endian ? l_data : ((char *)l_data + sizeChange),
 187                r_data, r_size);
 188
 189         /*
 190         fprintf(stderr,"r_data=");
 191         for (cpt=0; cpt<r_size; cpt++) {
 192           tester.i=0;
 193           tester.c[0] = ((char*)r_data)[cpt];
 194           fprintf(stderr,"\\%02x", tester.i);
 195         }
 196         fprintf(stderr,"\n");
 197
 198         fprintf(stderr,"l_data=");
 199         for (cpt=0; cpt<l_size; cpt++) {
 200           tester.i=0;
 201           tester.c[0]= ((char*)l_data)[cpt];
 202           fprintf(stderr,"\\%02x", tester.i);
 203         } fprintf(stderr,"\n");
 204         */
 205       }
 206     }
 207   }
 208
 209   /* flip bytes if needed */
 210   if(gras_arches[r_arch].endian != gras_arches[GRAS_THISARCH].endian &&
 211      (l_size * count)  > 1) {
 212
 213     for(cpt = 0, r_data=dst, l_data=dst;
 214         cpt < count;
 215         cpt++,
 216           r_data = (char *)r_data + l_size, /* resizing already done */
 217           l_data = (char *)l_data + l_size) {
 218
 219       DEBUG1("Flip elm %d",cpt);
 220       gras_dd_reverse_bytes(l_data, r_data, l_size);
 221     }
 222   }
 223
 224 }
 225
 226 static void
 227 gras_dd_reverse_bytes(void *to,
 228                       const void *from,
 229                       size_t length) {
 230
 231   char charBegin;
 232   const char *fromBegin;
 233   const char *fromEnd;
 234   char *toBegin;
 235   char *toEnd;
 236
 237   for(fromBegin = (const char *)from,
 238         fromEnd = fromBegin + length - 1,
 239         toBegin = (char *)to,
 240         toEnd = toBegin + length - 1;
 241
 242       fromBegin <= fromEnd;
 243
 244       fromBegin++, fromEnd--,
 245         toBegin++, toEnd--) {
 246
 247     charBegin = *fromBegin;
 248     *toBegin = *fromEnd;
 249     *toEnd = charBegin;
 250   }
 251 }
 252
 253
 254 /**
 255  * gras_arch_selfid:
 256  *
 257  * returns the ID of the architecture the process is running on
 258  */
 259 int
 260 gras_arch_selfid(void) {
 261   return GRAS_THISARCH;
 262 }