sys_funcs.cc

   1 /*
   2  * Copyright (c) 2004-2008 Stephen Williams (steve@icarus.com)
   3  *
   4  *    This source code is free software; you can redistribute it
   5  *    and/or modify it in source code form under the terms of the GNU
   6  *    General Public License as published by the Free Software
   7  *    Foundation; either version 2 of the License, or (at your option)
   8  *    any later version.
   9  *
  10  *    This program is distributed in the hope that it will be useful,
  11  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *    GNU General Public License for more details.
  14  *
  15  *    You should have received a copy of the GNU General Public License
  16  *    along with this program; if not, write to the Free Software
  17  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  18  */
  19
  20 # include  "config.h"
  21 # include  "compiler.h"
  22 # include  <stdio.h>
  23 # include  <cstring>
  24 # include  <cstdlib>
  25
  26 /*
  27  * Manage the information about system functions. This information is
  28  * collected from the sources before elaboration and made available
  29  * via the lookup_sys_func function.
  30  */
  31
  32 static const struct sfunc_return_type sfunc_table[] = {
  33       { "$realtime",   IVL_VT_REAL,   1, 0 },
  34       { "$bitstoreal", IVL_VT_REAL,   1, 0 },
  35       { "$itor",       IVL_VT_REAL,   1, 0 },
  36       { "$realtobits", IVL_VT_LOGIC, 64, 0 },
  37       { "$time",       IVL_VT_LOGIC, 64, 0 },
  38       { "$stime",      IVL_VT_LOGIC, 32, 0 },
  39       { "$simtime",    IVL_VT_LOGIC, 64, 0 },
  40       { 0,             IVL_VT_LOGIC, 32, 0 }
  41 };
  42
  43 struct sfunc_return_type_cell : sfunc_return_type {
  44       struct sfunc_return_type_cell*next;
  45 };
  46
  47 static struct sfunc_return_type_cell*sfunc_stack = 0;
  48
  49 const struct sfunc_return_type* lookup_sys_func(const char*name)
  50 {
  51         /* First, try to find then name in the function stack. */
  52       struct sfunc_return_type_cell*cur = sfunc_stack;
  53       while (cur) {
  54             if (strcmp(cur->name, name) == 0)
  55                   return cur;
  56
  57             cur = cur->next;
  58       }
  59
  60         /* Next, look in the core table. */
  61       unsigned idx = 0;
  62       while (sfunc_table[idx].name) {
  63
  64             if (strcmp(sfunc_table[idx].name, name) == 0)
  65                   return sfunc_table + idx;
  66
  67             idx += 1;
  68       }
  69
  70         /* No luck finding, so return the trailer, which give a
  71            default description. */
  72       return sfunc_table + idx;
  73 }
  74
  75 /*
  76  * This function loads a system functions descriptor file with the
  77  * format:
  78  *
  79  *    <name> <type> [<arguments>]
  80  */
  81 int load_sys_func_table(const char*path)
  82 {
  83       struct sfunc_return_type_cell*cell;
  84       FILE*fd = fopen(path, "r");
  85
  86       if (fd == 0) {
  87             if (verbose_flag) {
  88                   fprintf(stderr, "%s: Unable to open System Function Table file.\n", path);
  89             }
  90             return -1;
  91       }
  92
  93       if (verbose_flag) {
  94             fprintf(stderr, "%s: Processing System Function Table file.\n", path);
  95       }
  96
  97       char buf[256];
  98       while (fgets(buf, sizeof buf, fd)) {
  99             char*name = buf + strspn(buf, " \t\r\n");
 100
 101               /* Skip empty lines. */
 102             if (name[0] == 0)
 103                   continue;
 104               /* Skip comment lines. */
 105             if (name[0] == '#')
 106                   continue;
 107
 108             char*cp = name + strcspn(name, " \t\r\n");
 109             if (cp[0]) *cp++ = 0;
 110
 111             cp += strspn(cp, " \t\r\n");
 112
 113             char*stype = cp;
 114             if (stype[0] == 0) {
 115                   fprintf(stderr, "%s:%s: No function type?\n",
 116                           path, name);
 117                   continue;
 118             }
 119
 120             cp = stype + strcspn(stype, " \t\r\n");
 121             if (cp[0]) *cp++ = 0;
 122
 123             if (strcmp(stype,"vpiSysFuncReal") == 0) {
 124                   cell = new struct sfunc_return_type_cell;
 125                   cell->name = lex_strings.add(name);
 126                   cell->type = IVL_VT_REAL;
 127                   cell->wid  = 1;
 128                   cell->signed_flag = true;
 129                   cell->next = sfunc_stack;
 130                   sfunc_stack = cell;
 131                   continue;
 132             }
 133
 134             if (strcmp(stype,"vpiSysFuncInt") == 0) {
 135                   cell = new struct sfunc_return_type_cell;
 136                   cell->name = lex_strings.add(name);
 137                   cell->type = IVL_VT_LOGIC;
 138                   cell->wid  = 32;
 139                   cell->signed_flag = true;
 140                   cell->next = sfunc_stack;
 141                   sfunc_stack = cell;
 142                   continue;
 143             }
 144
 145               /* If this is a sized integer, then parse the additional
 146                  arguments, the width (decimal) and the optional
 147                  signed/unsigned flag. */
 148             if (strcmp(stype,"vpiSysFuncSized") == 0) {
 149                   cp += strspn(cp, " \t\r\n");
 150                   char*swidth = cp;
 151                   unsigned width = 32;
 152                   bool signed_flag = false;
 153
 154                   cp = swidth + strcspn(swidth, " \t\r\n");
 155                   if (cp[0]) *cp++ = 0;
 156
 157                   width = strtoul(swidth, 0, 10);
 158
 159                   cp += strspn(cp, " \t\r\n");
 160                   char*flag = cp;
 161
 162                   while (flag[0]) {
 163                         cp = flag + strcspn(flag, " \t\r\n");
 164                         if (cp[0]) *cp++ = 0;
 165
 166                         if (strcmp(flag,"signed") == 0) {
 167                               signed_flag = true;
 168
 169                         } else if (strcmp(flag,"unsigned") == 0) {
 170                               signed_flag = false;
 171                         }
 172
 173                         flag = cp + strspn(cp, " \t\r\n");
 174                   }
 175
 176                   cell = new struct sfunc_return_type_cell;
 177                   cell->name = lex_strings.add(name);
 178                   cell->type = IVL_VT_LOGIC;
 179                   cell->wid  = width;
 180                   cell->signed_flag = signed_flag;
 181                   cell->next = sfunc_stack;
 182                   sfunc_stack = cell;
 183                   continue;
 184             }
 185
 186             fprintf(stderr, "%s:%s: Unknown type: %s\n",
 187                     path, name, stype);
 188       }
 189
 190       return 0;
 191 }
 192