gdb/mi/mi-parse.c

   1 /* MI Command Set - MI parser.
   2
   3    Copyright (C) 2000, 2001, 2002, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Solutions (a Red Hat company).
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "mi-cmds.h"
  25 #include "mi-parse.h"
  26 #include "charset.h"
  27
  28 #include <ctype.h>
  29 #include "gdb_string.h"
  30
  31 /* Like parse_escape, but leave the results as a host char, not a
  32    target char.  */
  33
  34 static int
  35 mi_parse_escape (char **string_ptr)
  36 {
  37   int c = *(*string_ptr)++;
  38
  39   switch (c)
  40     {
  41       case '\n':
  42         return -2;
  43       case 0:
  44         (*string_ptr)--;
  45         return 0;
  46
  47       case '0':
  48       case '1':
  49       case '2':
  50       case '3':
  51       case '4':
  52       case '5':
  53       case '6':
  54       case '7':
  55         {
  56           int i = host_hex_value (c);
  57           int count = 0;
  58
  59           while (++count < 3)
  60             {
  61               c = (**string_ptr);
  62               if (isdigit (c) && c != '8' && c != '9')
  63                 {
  64                   (*string_ptr)++;
  65                   i *= 8;
  66                   i += host_hex_value (c);
  67                 }
  68               else
  69                 {
  70                   break;
  71                 }
  72             }
  73           return i;
  74         }
  75
  76     case 'a':
  77       c = '\a';
  78       break;
  79     case 'b':
  80       c = '\b';
  81       break;
  82     case 'f':
  83       c = '\f';
  84       break;
  85     case 'n':
  86       c = '\n';
  87       break;
  88     case 'r':
  89       c = '\r';
  90       break;
  91     case 't':
  92       c = '\t';
  93       break;
  94     case 'v':
  95       c = '\v';
  96       break;
  97
  98     default:
  99       break;
 100     }
 101
 102   return c;
 103 }
 104
 105 static void
 106 mi_parse_argv (char *args, struct mi_parse *parse)
 107 {
 108   char *chp = args;
 109   int argc = 0;
 110   char **argv = xmalloc ((argc + 1) * sizeof (char *));
 111
 112   argv[argc] = NULL;
 113   while (1)
 114     {
 115       char *arg;
 116
 117       /* skip leading white space */
 118       while (isspace (*chp))
 119         chp++;
 120       /* Three possibilities: EOF, quoted string, or other text. */
 121       switch (*chp)
 122         {
 123         case '\0':
 124           parse->argv = argv;
 125           parse->argc = argc;
 126           return;
 127         case '"':
 128           {
 129             /* A quoted string. */
 130             int len;
 131             char *start = chp + 1;
 132
 133             /* Determine the buffer size. */
 134             chp = start;
 135             len = 0;
 136             while (*chp != '\0' && *chp != '"')
 137               {
 138                 if (*chp == '\\')
 139                   {
 140                     chp++;
 141                     if (mi_parse_escape (&chp) <= 0)
 142                       {
 143                         /* Do not allow split lines or "\000" */
 144                         freeargv (argv);
 145                         return;
 146                       }
 147                   }
 148                 else
 149                   chp++;
 150                 len++;
 151               }
 152             /* Insist on a closing quote. */
 153             if (*chp != '"')
 154               {
 155                 freeargv (argv);
 156                 return;
 157               }
 158             /* Insist on trailing white space. */
 159             if (chp[1] != '\0' && !isspace (chp[1]))
 160               {
 161                 freeargv (argv);
 162                 return;
 163               }
 164             /* create the buffer. */
 165             arg = xmalloc ((len + 1) * sizeof (char));
 166             /* And copy the characters in. */
 167             chp = start;
 168             len = 0;
 169             while (*chp != '\0' && *chp != '"')
 170               {
 171                 if (*chp == '\\')
 172                   {
 173                     chp++;
 174                     arg[len] = mi_parse_escape (&chp);
 175                   }
 176                 else
 177                   arg[len] = *chp++;
 178                 len++;
 179               }
 180             arg[len] = '\0';
 181             chp++;              /* that closing quote. */
 182             break;
 183           }
 184         default:
 185           {
 186             /* An unquoted string.  Accumulate all non blank
 187                characters into a buffer. */
 188             int len;
 189             char *start = chp;
 190
 191             while (*chp != '\0' && !isspace (*chp))
 192               {
 193                 chp++;
 194               }
 195             len = chp - start;
 196             arg = xmalloc ((len + 1) * sizeof (char));
 197             strncpy (arg, start, len);
 198             arg[len] = '\0';
 199             break;
 200           }
 201         }
 202       /* Append arg to argv. */
 203       argv = xrealloc (argv, (argc + 2) * sizeof (char *));
 204       argv[argc++] = arg;
 205       argv[argc] = NULL;
 206     }
 207 }
 208
 209
 210 void
 211 mi_parse_free (struct mi_parse *parse)
 212 {
 213   if (parse == NULL)
 214     return;
 215   if (parse->command != NULL)
 216     xfree (parse->command);
 217   if (parse->token != NULL)
 218     xfree (parse->token);
 219   if (parse->args != NULL)
 220     xfree (parse->args);
 221   if (parse->argv != NULL)
 222     freeargv (parse->argv);
 223   xfree (parse);
 224 }
 225
 226 /* A cleanup that calls mi_parse_free.  */
 227
 228 static void
 229 mi_parse_cleanup (void *arg)
 230 {
 231   mi_parse_free (arg);
 232 }
 233
 234 struct mi_parse *
 235 mi_parse (char *cmd, char **token)
 236 {
 237   char *chp;
 238   struct mi_parse *parse = XMALLOC (struct mi_parse);
 239   struct cleanup *cleanup;
 240
 241   memset (parse, 0, sizeof (*parse));
 242   parse->all = 0;
 243   parse->thread_group = -1;
 244   parse->thread = -1;
 245   parse->frame = -1;
 246
 247   cleanup = make_cleanup (mi_parse_cleanup, parse);
 248
 249   /* Before starting, skip leading white space. */
 250   while (isspace (*cmd))
 251     cmd++;
 252
 253   /* Find/skip any token and then extract it. */
 254   for (chp = cmd; *chp >= '0' && *chp <= '9'; chp++)
 255     ;
 256   *token = xmalloc ((chp - cmd + 1) * sizeof (char *));
 257   memcpy (*token, cmd, (chp - cmd));
 258   (*token)[chp - cmd] = '\0';
 259
 260   /* This wasn't a real MI command.  Return it as a CLI_COMMAND. */
 261   if (*chp != '-')
 262     {
 263       while (isspace (*chp))
 264         chp++;
 265       parse->command = xstrdup (chp);
 266       parse->op = CLI_COMMAND;
 267
 268       discard_cleanups (cleanup);
 269
 270       return parse;
 271     }
 272
 273   /* Extract the command. */
 274   {
 275     char *tmp = chp + 1;        /* discard ``-'' */
 276
 277     for (; *chp && !isspace (*chp); chp++)
 278       ;
 279     parse->command = xmalloc ((chp - tmp + 1) * sizeof (char *));
 280     memcpy (parse->command, tmp, chp - tmp);
 281     parse->command[chp - tmp] = '\0';
 282   }
 283
 284   /* Find the command in the MI table. */
 285   parse->cmd = mi_lookup (parse->command);
 286   if (parse->cmd == NULL)
 287     error (_("Undefined MI command: %s"), parse->command);
 288
 289   /* Skip white space following the command. */
 290   while (isspace (*chp))
 291     chp++;
 292
 293   /* Parse the --thread and --frame options, if present.  At present,
 294      some important commands, like '-break-*' are implemented by forwarding
 295      to the CLI layer directly.  We want to parse --thread and --frame
 296      here, so as not to leave those option in the string that will be passed
 297      to CLI.  */
 298   for (;;)
 299     {
 300       char *start = chp;
 301       size_t as = sizeof ("--all ") - 1;
 302       size_t tgs = sizeof ("--thread-group ") - 1;
 303       size_t ts = sizeof ("--thread ") - 1;
 304       size_t fs = sizeof ("--frame ") - 1;
 305
 306       if (strncmp (chp, "--all ", as) == 0)
 307         {
 308           parse->all = 1;
 309           chp += as;
 310         }
 311       /* See if --all is the last token in the input.  */
 312       if (strcmp (chp, "--all") == 0)
 313         {
 314           parse->all = 1;
 315           chp += strlen (chp);
 316         }
 317       if (strncmp (chp, "--thread-group ", tgs) == 0)
 318         {
 319           if (parse->thread_group != -1)
 320             error (_("Duplicate '--thread-group' option"));
 321           chp += tgs;
 322           if (*chp != 'i')
 323             error (_("Invalid thread group id"));
 324           chp += 1;
 325           parse->thread_group = strtol (chp, &chp, 10);
 326         }
 327       else if (strncmp (chp, "--thread ", ts) == 0)
 328         {
 329           if (parse->thread != -1)
 330             error (_("Duplicate '--thread' option"));
 331           chp += ts;
 332           parse->thread = strtol (chp, &chp, 10);
 333         }
 334       else if (strncmp (chp, "--frame ", fs) == 0)
 335         {
 336           if (parse->frame != -1)
 337             error (_("Duplicate '--frame' option"));
 338           chp += fs;
 339           parse->frame = strtol (chp, &chp, 10);
 340         }
 341       else
 342         break;
 343
 344       if (*chp != '\0' && !isspace (*chp))
 345         error (_("Invalid value for the '%s' option"),
 346                start[2] == 't' ? "--thread" : "--frame");
 347       while (isspace (*chp))
 348         chp++;
 349     }
 350
 351   /* For new argv commands, attempt to return the parsed argument
 352      list. */
 353   if (parse->cmd->argv_func != NULL)
 354     {
 355       mi_parse_argv (chp, parse);
 356       if (parse->argv == NULL)
 357         error (_("Problem parsing arguments: %s %s"), parse->command, chp);
 358     }
 359
 360   /* FIXME: DELETE THIS */
 361   /* For CLI commands, also return the remainder of the
 362      command line as a single string. */
 363   if (parse->cmd->cli.cmd != NULL)
 364     parse->args = xstrdup (chp);
 365
 366   discard_cleanups (cleanup);
 367
 368   /* Fully parsed. */
 369   parse->op = MI_COMMAND;
 370   return parse;
 371 }