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(ddt_convert,datadesc,
  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
  52   {"big32_8_4",  1, {1,2,4,4,8,   4,4,   4,8}, /* AIX */
  53                     {1,2,4,4,8,   4,4,   4,4}},
  54
  55   {"big32_4",    1, {1,2,4,4,8,   4,4,   4,8}, /* G5 */
  56                     {1,2,4,4,4,   4,4,   4,4}},
  57
  58   {"big32_2",    1, {1,2,4,4,8,   4,4,   4,8}, /* ARM */
  59                     {1,2,2,2,2,   2,2,   2,2}},
  60
  61   {"big64",      1, {1,2,4,8,8,   8,8,   4,8}, /* sparc */
  62                     {1,2,4,8,8,   8,8,   4,8}}
  63 };
  64
  65 const char *gras_datadesc_arch_name(int code) {
  66    if (code < 0 || code >= gras_arch_count)
  67      return "[unknown arch]";
  68    return gras_arches[code].name;
  69 }
  70
  71
  72 /**
  73  * Local function doing the grunt work
  74  */
  75 static void
  76 gras_dd_reverse_bytes(void *to,
  77                       const void *from,
  78                       size_t length);
  79
  80 /**
  81  * gras_dd_convert_elm:
  82  *
  83  * Convert the element described by @type comming from architecture @r_arch.
  84  * The data to be converted is stored in @src, and is to be stored in @dst.
  85  * Both pointers may be the same location if no resizing is needed.
  86  */
  87 xbt_error_t
  88 gras_dd_convert_elm(gras_datadesc_type_t type, int count,
  89                     int r_arch,
  90                     void *src, void *dst) {
  91   gras_dd_cat_scalar_t scal = type->category.scalar_data;
  92   int cpt;
  93   const void *r_data;
  94   void *l_data;
  95   unsigned long r_size, l_size;
  96   /* Hexadecimal displayer
  97   union {
  98     char c[sizeof(int)];
  99     int i;
 100   } tester;
 101   */
 102
 103   xbt_assert(type->category_code == e_gras_datadesc_type_cat_scalar);
 104   xbt_assert(r_arch != GRAS_THISARCH);
 105
 106   r_size = type->size[r_arch];
 107   l_size = type->size[GRAS_THISARCH];
 108   DEBUG4("r_size=%lu l_size=%lu,    src=%p dst=%p",
 109          r_size,l_size,src,dst);
 110
 111   DEBUG2("remote=%c local=%c", gras_arches[r_arch].endian?'B':'l',
 112          gras_arches[GRAS_THISARCH].endian?'B':'l');
 113
 114   if(r_size != l_size) {
 115     for(cpt = 0, r_data = src, l_data = dst;
 116         cpt < count;
 117         cpt++,
 118           r_data = (char *)r_data + r_size,
 119           l_data = (char *)l_data + l_size) {
 120
 121       /*
 122       fprintf(stderr,"r_data=");
 123       for (cpt=0; cpt<r_size; cpt++) {
 124         tester.i=0;
 125         tester.c[0]= ((char*)r_data)[cpt];
 126         fprintf(stderr,"\\%02x", tester.i);
 127       }
 128       fprintf(stderr,"\n");
 129       */
 130
 131       /* Resize that damn integer, pal */
 132
 133       unsigned char *l_sign, *r_sign;
 134       int padding;
 135       int sizeChange = l_size - r_size;
 136       int lowOrderFirst = !gras_arches[r_arch].endian ||
 137         gras_arches[r_arch].endian == gras_arches[GRAS_THISARCH].endian;
 138
 139       DEBUG5("Resize integer %d from %lu @%p to %lu @%p",
 140              cpt, r_size,r_data, l_size,l_data);
 141       xbt_assert0(r_data != l_data, "Impossible to resize in place");
 142
 143       if(sizeChange < 0) {
 144         DEBUG3("Truncate %d bytes (%s,%s)", -sizeChange,
 145                lowOrderFirst?"lowOrderFirst":"bigOrderFirst",
 146                scal.encoding == e_gras_dd_scalar_encoding_sint?"signed":"unsigned");
 147         /* Truncate high-order bytes. */
 148         memcpy(l_data,
 149                gras_arches[r_arch].endian ? ((char*)r_data-sizeChange)
 150                                           :         r_data,
 151                l_size);
 152
 153         if(scal.encoding == e_gras_dd_scalar_encoding_sint) {
 154           DEBUG0("This is signed");
 155           /* Make sure the high order bit of r_data and l_data are the same */
 156           l_sign = gras_arches[GRAS_THISARCH].endian
 157                  ? ((unsigned char*)l_data + l_size - 1)
 158                  :  (unsigned char*)l_data;
 159           r_sign = gras_arches[r_arch].endian
 160                  ? ((unsigned char*)r_data + r_size - 1)
 161                  :  (unsigned char*)r_data;
 162           DEBUG2("This is signed (r_sign=%c l_sign=%c", *r_sign,*l_sign);
 163
 164           if ((*r_sign > 127) != (*l_sign > 127)) {
 165             if(*r_sign > 127)
 166               *l_sign += 128;
 167             else
 168               *l_sign -= 128;
 169           }
 170         }
 171       } else {
 172         DEBUG1("Extend %d bytes", sizeChange);
 173         if (scal.encoding != e_gras_dd_scalar_encoding_sint) {
 174           DEBUG0("This is signed");
 175           padding = 0; /* pad unsigned with 0 */
 176         } else {
 177           /* extend sign */
 178           r_sign = gras_arches[r_arch].endian ? ((unsigned char*)r_data + r_size - 1)
 179                                               :  (unsigned char*)r_data;
 180           padding = (*r_sign > 127) ? 0xff : 0;
 181         }
 182
 183         memset(l_data, padding, l_size);
 184         memcpy(!gras_arches[r_arch].endian ? l_data : ((char *)l_data + sizeChange),
 185                r_data, r_size);
 186
 187         /*
 188         fprintf(stderr,"r_data=");
 189         for (cpt=0; cpt<r_size; cpt++) {
 190           tester.i=0;
 191           tester.c[0] = ((char*)r_data)[cpt];
 192           fprintf(stderr,"\\%02x", tester.i);
 193         }
 194         fprintf(stderr,"\n");
 195
 196         fprintf(stderr,"l_data=");
 197         for (cpt=0; cpt<l_size; cpt++) {
 198           tester.i=0;
 199           tester.c[0]= ((char*)l_data)[cpt];
 200           fprintf(stderr,"\\%02x", tester.i);
 201         } fprintf(stderr,"\n");
 202         */
 203       }
 204     }
 205   }
 206
 207   /* flip bytes if needed */
 208   if(gras_arches[r_arch].endian != gras_arches[GRAS_THISARCH].endian &&
 209      (l_size * count)  > 1) {
 210
 211     for(cpt = 0, r_data=dst, l_data=dst;
 212         cpt < count;
 213         cpt++,
 214           r_data = (char *)r_data + l_size, /* resizing already done */
 215           l_data = (char *)l_data + l_size) {
 216
 217       DEBUG1("Flip elm %d",cpt);
 218       gras_dd_reverse_bytes(l_data, r_data, l_size);
 219     }
 220   }
 221
 222   return no_error;
 223 }
 224
 225 static void
 226 gras_dd_reverse_bytes(void *to,
 227                       const void *from,
 228                       size_t length) {
 229
 230   char charBegin;
 231   const char *fromBegin;
 232   const char *fromEnd;
 233   char *toBegin;
 234   char *toEnd;
 235
 236   for(fromBegin = (const char *)from,
 237         fromEnd = fromBegin + length - 1,
 238         toBegin = (char *)to,
 239         toEnd = toBegin + length - 1;
 240
 241       fromBegin <= fromEnd;
 242
 243       fromBegin++, fromEnd--,
 244         toBegin++, toEnd--) {
 245
 246     charBegin = *fromBegin;
 247     *toBegin = *fromEnd;
 248     *toEnd = charBegin;
 249   }
 250 }
 251
 252
 253 /**
 254  * gras_arch_selfid:
 255  *
 256  * returns the ID of the architecture the process is running on
 257  */
 258 int
 259 gras_arch_selfid(void) {
 260   return GRAS_THISARCH;
 261 }