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
  27 #include <ctype.h>
  28 #include "gdb_string.h"
  29
  30 static void
  31 mi_parse_argv (char *args, struct mi_parse *parse)
  32 {
  33   char *chp = args;
  34   int argc = 0;
  35   char **argv = xmalloc ((argc + 1) * sizeof (char *));
  36   argv[argc] = NULL;
  37   while (1)
  38     {
  39       char *arg;
  40       /* skip leading white space */
  41       while (isspace (*chp))
  42         chp++;
  43       /* Three possibilities: EOF, quoted string, or other text. */
  44       switch (*chp)
  45         {
  46         case '\0':
  47           parse->argv = argv;
  48           parse->argc = argc;
  49           return;
  50         case '"':
  51           {
  52             /* A quoted string. */
  53             int len;
  54             char *start = chp + 1;
  55             /* Determine the buffer size. */
  56             chp = start;
  57             len = 0;
  58             while (*chp != '\0' && *chp != '"')
  59               {
  60                 if (*chp == '\\')
  61                   {
  62                     chp++;
  63                     if (parse_escape (&chp) <= 0)
  64                       {
  65                         /* Do not allow split lines or "\000" */
  66                         freeargv (argv);
  67                         return;
  68                       }
  69                   }
  70                 else
  71                   chp++;
  72                 len++;
  73               }
  74             /* Insist on a closing quote. */
  75             if (*chp != '"')
  76               {
  77                 freeargv (argv);
  78                 return;
  79               }
  80             /* Insist on trailing white space. */
  81             if (chp[1] != '\0' && !isspace (chp[1]))
  82               {
  83                 freeargv (argv);
  84                 return;
  85               }
  86             /* create the buffer. */
  87             arg = xmalloc ((len + 1) * sizeof (char));
  88             /* And copy the characters in. */
  89             chp = start;
  90             len = 0;
  91             while (*chp != '\0' && *chp != '"')
  92               {
  93                 if (*chp == '\\')
  94                   {
  95                     chp++;
  96                     arg[len] = parse_escape (&chp);
  97                   }
  98                 else
  99                   arg[len] = *chp++;
 100                 len++;
 101               }
 102             arg[len] = '\0';
 103             chp++;              /* that closing quote. */
 104             break;
 105           }
 106         default:
 107           {
 108             /* An unquoted string.  Accumulate all non blank
 109                characters into a buffer. */
 110             int len;
 111             char *start = chp;
 112             while (*chp != '\0' && !isspace (*chp))
 113               {
 114                 chp++;
 115               }
 116             len = chp - start;
 117             arg = xmalloc ((len + 1) * sizeof (char));
 118             strncpy (arg, start, len);
 119             arg[len] = '\0';
 120             break;
 121           }
 122         }
 123       /* Append arg to argv. */
 124       argv = xrealloc (argv, (argc + 2) * sizeof (char *));
 125       argv[argc++] = arg;
 126       argv[argc] = NULL;
 127     }
 128 }
 129
 130
 131 void
 132 mi_parse_free (struct mi_parse *parse)
 133 {
 134   if (parse == NULL)
 135     return;
 136   if (parse->command != NULL)
 137     xfree (parse->command);
 138   if (parse->token != NULL)
 139     xfree (parse->token);
 140   if (parse->args != NULL)
 141     xfree (parse->args);
 142   if (parse->argv != NULL)
 143     freeargv (parse->argv);
 144   xfree (parse);
 145 }
 146
 147
 148 struct mi_parse *
 149 mi_parse (char *cmd)
 150 {
 151   char *chp;
 152   struct mi_parse *parse = XMALLOC (struct mi_parse);
 153   memset (parse, 0, sizeof (*parse));
 154   parse->thread = -1;
 155   parse->frame = -1;
 156
 157   /* Before starting, skip leading white space. */
 158   while (isspace (*cmd))
 159     cmd++;
 160
 161   /* Find/skip any token and then extract it. */
 162   for (chp = cmd; *chp >= '0' && *chp <= '9'; chp++)
 163     ;
 164   parse->token = xmalloc ((chp - cmd + 1) * sizeof (char *));
 165   memcpy (parse->token, cmd, (chp - cmd));
 166   parse->token[chp - cmd] = '\0';
 167
 168   /* This wasn't a real MI command.  Return it as a CLI_COMMAND. */
 169   if (*chp != '-')
 170     {
 171       while (isspace (*chp))
 172         chp++;
 173       parse->command = xstrdup (chp);
 174       parse->op = CLI_COMMAND;
 175       return parse;
 176     }
 177
 178   /* Extract the command. */
 179   {
 180     char *tmp = chp + 1;        /* discard ``-'' */
 181     for (; *chp && !isspace (*chp); chp++)
 182       ;
 183     parse->command = xmalloc ((chp - tmp + 1) * sizeof (char *));
 184     memcpy (parse->command, tmp, chp - tmp);
 185     parse->command[chp - tmp] = '\0';
 186   }
 187
 188   /* Find the command in the MI table. */
 189   parse->cmd = mi_lookup (parse->command);
 190   if (parse->cmd == NULL)
 191     {
 192       /* FIXME: This should be a function call. */
 193       fprintf_unfiltered
 194         (raw_stdout,
 195          "%s^error,msg=\"Undefined MI command: %s\"\n",
 196          parse->token, parse->command);
 197       mi_parse_free (parse);
 198       return NULL;
 199     }
 200
 201   /* Skip white space following the command. */
 202   while (isspace (*chp))
 203     chp++;
 204
 205   /* Parse the --thread and --frame options, if present.  At present,
 206      some important commands, like '-break-*' are implemented by forwarding
 207      to the CLI layer directly.  We want to parse --thread and --frame
 208      here, so as not to leave those option in the string that will be passed
 209      to CLI.  */
 210   for (;;)
 211     {
 212       char *start = chp;
 213       size_t ts = sizeof ("--thread ") - 1;
 214       size_t fs = sizeof ("--frame ") - 1;
 215       if (strncmp (chp, "--thread ", ts) == 0)
 216         {
 217           if (parse->thread != -1)
 218             error ("Duplicate '--thread' option");
 219           chp += ts;
 220           parse->thread = strtol (chp, &chp, 10);
 221         }
 222       else if (strncmp (chp, "--frame ", fs) == 0)
 223         {
 224           if (parse->frame != -1)
 225             error ("Duplicate '--frame' option");
 226           chp += fs;
 227           parse->frame = strtol (chp, &chp, 10);
 228         }
 229       else
 230         break;
 231
 232       if (*chp != '\0' && !isspace (*chp))
 233         error ("Invalid value for the '%s' option",
 234                start[2] == 't' ? "--thread" : "--frame");
 235       while (isspace (*chp))
 236         chp++;
 237     }
 238
 239   /* For new argv commands, attempt to return the parsed argument
 240      list. */
 241   if (parse->cmd->argv_func != NULL)
 242     {
 243       mi_parse_argv (chp, parse);
 244       if (parse->argv == NULL)
 245         {
 246           /* FIXME: This should be a function call. */
 247           fprintf_unfiltered
 248             (raw_stdout,
 249              "%s^error,msg=\"Problem parsing arguments: %s %s\"\n",
 250              parse->token, parse->command, chp);
 251           mi_parse_free (parse);
 252           return NULL;
 253         }
 254     }
 255
 256   /* FIXME: DELETE THIS */
 257   /* For CLI commands, also return the remainder of the
 258      command line as a single string. */
 259   if (parse->cmd->cli.cmd != NULL)
 260     parse->args = xstrdup (chp);
 261
 262   /* Fully parsed. */
 263   parse->op = MI_COMMAND;
 264   return parse;
 265 }