sim-options.c

这个是LINUX下的GDB调度工具的源码

SIM_RC
sim_parse_args (sd, argv)
     SIM_DESC sd;
     char **argv;
{
  int c, i, argc, num_opts;
  char *p, *short_options;
  /* The `val' option struct entry is dynamically assigned for options that
     only come in the long form.  ORIG_VAL is used to get the original value
     back.  */
  int *orig_val;
  struct option *lp, *long_options;
  const struct option_list *ol;
  const OPTION *opt;
  OPTION_HANDLER **handlers;
  sim_cpu **opt_cpu;
  SIM_RC result = SIM_RC_OK;

  /* Count the number of arguments.  */
  for (argc = 0; argv[argc] != NULL; ++argc)
    continue;

  /* Count the number of options.  */
  num_opts = 0;
  for (ol = STATE_OPTIONS (sd); ol != NULL; ol = ol->next)
    for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
      ++num_opts;
  for (i = 0; i < MAX_NR_PROCESSORS; ++i)
    for (ol = CPU_OPTIONS (STATE_CPU (sd, i)); ol != NULL; ol = ol->next)
      for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
	++num_opts;

  /* Initialize duplicate argument checker.  */
  (void) dup_arg_p (NULL);

  /* Build the option table for getopt.  */

  long_options = NZALLOC (struct option, num_opts + 1);
  lp = long_options;
  short_options = NZALLOC (char, num_opts * 3 + 1);
  p = short_options;
  handlers = NZALLOC (OPTION_HANDLER *, OPTION_START + num_opts);
  orig_val = NZALLOC (int, OPTION_START + num_opts);
  opt_cpu = NZALLOC (sim_cpu *, OPTION_START + num_opts);

  /* Set '+' as first char so argument permutation isn't done.  This
     is done to stop getopt_long returning options that appear after
     the target program.  Such options should be passed unchanged into
     the program image. */
  *p++ = '+';

  for (i = OPTION_START, ol = STATE_OPTIONS (sd); ol != NULL; ol = ol->next)
    for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
      {
	if (dup_arg_p (opt->opt.name))
	  continue;
	if (opt->shortopt != 0)
	  {
	    *p++ = opt->shortopt;
	    if (opt->opt.has_arg == required_argument)
	      *p++ = ':';
	    else if (opt->opt.has_arg == optional_argument)
	      { *p++ = ':'; *p++ = ':'; }
	    handlers[(unsigned char) opt->shortopt] = opt->handler;
	    if (opt->opt.val != 0)
	      orig_val[(unsigned char) opt->shortopt] = opt->opt.val;
	    else
	      orig_val[(unsigned char) opt->shortopt] = opt->shortopt;
	  }
	if (opt->opt.name != NULL)
	  {
	    *lp = opt->opt;
	    /* Dynamically assign `val' numbers for long options. */
	    lp->val = i++;
	    handlers[lp->val] = opt->handler;
	    orig_val[lp->val] = opt->opt.val;
	    opt_cpu[lp->val] = NULL;
	    ++lp;
	  }
      }

  for (c = 0; c < MAX_NR_PROCESSORS; ++c)
    {
      sim_cpu *cpu = STATE_CPU (sd, c);
      for (ol = CPU_OPTIONS (cpu); ol != NULL; ol = ol->next)
	for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
	  {
#if 0 /* Each option is prepended with --<cpuname>- so this greatly cuts down
	 on the need for dup_arg_p checking.  Maybe in the future it'll be
	 needed so this is just commented out, and not deleted.  */
	    if (dup_arg_p (opt->opt.name))
	      continue;
#endif
	    /* Don't allow short versions of cpu specific options for now.  */
	    if (opt->shortopt != 0)
	      {
		sim_io_eprintf (sd, "internal error, short cpu specific option");
		result = SIM_RC_FAIL;
		break;
	      }
	    if (opt->opt.name != NULL)
	      {
		char *name;
		*lp = opt->opt;
		/* Prepend --<cpuname>- to the option.  */
		asprintf (&name, "%s-%s", CPU_NAME (cpu), lp->name);
		lp->name = name;
		/* Dynamically assign `val' numbers for long options. */
		lp->val = i++;
		handlers[lp->val] = opt->handler;
		orig_val[lp->val] = opt->opt.val;
		opt_cpu[lp->val] = cpu;
		++lp;
	      }
	  }
    }
	    
  /* Terminate the short and long option lists.  */
  *p = 0;
  lp->name = NULL;

  /* Ensure getopt is initialized.  */
  optind = 0;

  while (1)
    {
      int longind, optc;

      optc = getopt_long (argc, argv, short_options, long_options, &longind);
      if (optc == -1)
	{
	  if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
	    STATE_PROG_ARGV (sd) = dupargv (argv + optind);
	  break;
	}
      if (optc == '?')
	{
	  result = SIM_RC_FAIL;
	  break;
	}

      if ((*handlers[optc]) (sd, opt_cpu[optc], orig_val[optc], optarg, 0/*!is_command*/) == SIM_RC_FAIL)
	{
	  result = SIM_RC_FAIL;
	  break;
	}
    }

  zfree (long_options);
  zfree (short_options);
  zfree (handlers);
  zfree (opt_cpu);
  zfree (orig_val);
  return result;
}

/* Utility of sim_print_help to print a list of option tables.  */

static void
print_help (SIM_DESC sd, sim_cpu *cpu, const struct option_list *ol, int is_command)
{
  const OPTION *opt;

  for ( ; ol != NULL; ol = ol->next)
    for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
      {
	const int indent = 30;
	int comma, len;
	const OPTION *o;

	if (dup_arg_p (opt->opt.name))
	  continue;

	if (opt->doc == NULL)
	  continue;

	if (opt->doc_name != NULL && opt->doc_name [0] == '\0')
	  continue;

	sim_io_printf (sd, "  ");

	comma = 0;
	len = 2;

	/* list any short options (aliases) for the current OPT */
	if (!is_command)
	  {
	    o = opt;
	    do
	      {
		if (o->shortopt != '\0')
		  {
		    sim_io_printf (sd, "%s-%c", comma ? ", " : "", o->shortopt);
		    len += (comma ? 2 : 0) + 2;
		    if (o->arg != NULL)
		      {
			if (o->opt.has_arg == optional_argument)
			  {
			    sim_io_printf (sd, "[%s]", o->arg);
			    len += 1 + strlen (o->arg) + 1;
			  }
			else
			  {
			    sim_io_printf (sd, " %s", o->arg);
			    len += 1 + strlen (o->arg);
			  }
		      }
		    comma = 1;
		  }
		++o;
	      }
	    while (OPTION_VALID_P (o) && o->doc == NULL);
	  }
	
	/* list any long options (aliases) for the current OPT */
	o = opt;
	do
	  {
	    const char *name;
	    const char *cpu_prefix = cpu ? CPU_NAME (cpu) : NULL;
	    if (o->doc_name != NULL)
	      name = o->doc_name;
	    else
	      name = o->opt.name;
	    if (name != NULL)
	      {
		sim_io_printf (sd, "%s%s%s%s%s",
			       comma ? ", " : "",
			       is_command ? "" : "--",
			       cpu ? cpu_prefix : "",
			       cpu ? "-" : "",
			       name);
		len += ((comma ? 2 : 0)
			+ (is_command ? 0 : 2)
			+ strlen (name));
		if (o->arg != NULL)
		  {
		    if (o->opt.has_arg == optional_argument)
		      {
			sim_io_printf (sd, "[=%s]", o->arg);
			len += 2 + strlen (o->arg) + 1;
		      }
		    else
		      {
			sim_io_printf (sd, " %s", o->arg);
			len += 1 + strlen (o->arg);
		      }
		  }
		comma = 1;
	      }
	    ++o;
	  }
	while (OPTION_VALID_P (o) && o->doc == NULL);

	if (len >= indent)
	  {
	    sim_io_printf (sd, "\n%*s", indent, "");
	  }
	else
	  sim_io_printf (sd, "%*s", indent - len, "");

	/* print the description, word wrap long lines */
	{
	  const char *chp = opt->doc;
	  unsigned doc_width = 80 - indent;
	  while (strlen (chp) >= doc_width) /* some slack */
	    {
	      const char *end = chp + doc_width - 1;
	      while (end > chp && !isspace (*end))
		end --;
	      if (end == chp)
		end = chp + doc_width - 1;
	      /* The cast should be ok - its distances between to
                 points in a string.  */
	      sim_io_printf (sd, "%.*s\n%*s", (int) (end - chp), chp, indent,
			     "");
	      chp = end;
	      while (isspace (*chp) && *chp != '\0')
		chp++;
	    }
	  sim_io_printf (sd, "%s\n", chp);
	}
      }
}

/* Print help messages for the options.  */

void
sim_print_help (sd, is_command)
     SIM_DESC sd;
     int is_command;
{
  if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
    sim_io_printf (sd, "Usage: %s [options] program [program args]\n",
		   STATE_MY_NAME (sd));

  /* Initialize duplicate argument checker.  */
  (void) dup_arg_p (NULL);

  if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
    sim_io_printf (sd, "Options:\n");
  else
    sim_io_printf (sd, "Commands:\n");

  print_help (sd, NULL, STATE_OPTIONS (sd), is_command);
  sim_io_printf (sd, "\n");

  /* Print cpu-specific options.  */
  {
    int i;

    for (i = 0; i < MAX_NR_PROCESSORS; ++i)
      {
	sim_cpu *cpu = STATE_CPU (sd, i);
	if (CPU_OPTIONS (cpu) == NULL)
	  continue;
	sim_io_printf (sd, "CPU %s specific options:\n", CPU_NAME (cpu));
	print_help (sd, cpu, CPU_OPTIONS (cpu), is_command);
	sim_io_printf (sd, "\n");
      }
  }

  sim_io_printf (sd, "Note: Depending on the simulator configuration some %ss\n",
		 STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE ? "option" : "command");
  sim_io_printf (sd, "      may not be applicable\n");

  if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
    {
      sim_io_printf (sd, "\n");
      sim_io_printf (sd, "program args    Arguments to pass to simulated program.\n");
      sim_io_printf (sd, "                Note: Very few simulators support this.\n");
    }
}

/* Utility of sim_args_command to find the closest match for a command.
   Commands that have "-" in them can be specified as separate words.
   e.g. sim memory-region 0x800000,0x4000
   or   sim memory region 0x800000,0x4000
   If CPU is non-null, use its option table list, otherwise use the main one.
   *PARGI is where to start looking in ARGV.  It is updated to point past
   the found option.  */

static const OPTION *
find_match (SIM_DESC sd, sim_cpu *cpu, char *argv[], int *pargi)
{
  const struct option_list *ol;
  const OPTION *opt;
  /* most recent option match */
  const OPTION *matching_opt = NULL;
  int matching_argi = -1;

  if (cpu)
    ol = CPU_OPTIONS (cpu);
  else
    ol = STATE_OPTIONS (sd);

  /* Skip passed elements specified by *PARGI.  */
  argv += *pargi;

  for ( ; ol != NULL; ol = ol->next)
    for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
      {
	int argi = 0;
	const char *name = opt->opt.name;
	if (name == NULL)
	  continue;
	while (argv [argi] != NULL
	       && strncmp (name, argv [argi], strlen (argv [argi])) == 0)
	  {
	    name = &name [strlen (argv[argi])];
	    if (name [0] == '-')
	      {
		/* leading match ...<a-b-c>-d-e-f - continue search */
		name ++; /* skip `-' */
		argi ++;
		continue;
	      }
	    else if (name [0] == '\0')
	      {
		/* exact match ...<a-b-c-d-e-f> - better than before? */
		if (argi > matching_argi)
		  {
		    matching_argi = argi;
		    matching_opt = opt;
		  }
		break;
	      }
	    else
	      break;
	  }
      }

  *pargi = matching_argi;
  return matching_opt;
}

SIM_RC
sim_args_command (SIM_DESC sd, char *cmd)
{
  /* something to do? */
  if (cmd == NULL)
    return SIM_RC_OK; /* FIXME - perhaps help would be better */
  
  if (cmd [0] == '-')
    {
      /* user specified -<opt> ... form? */
      char **argv = buildargv (cmd);
      SIM_RC rc = sim_parse_args (sd, argv);
      freeargv (argv);
      return rc;
    }
  else
    {
      char **argv = buildargv (cmd);
      const OPTION *matching_opt = NULL;
      int matching_argi;
      sim_cpu *cpu;

      if (argv [0] == NULL)
	return SIM_RC_OK; /* FIXME - perhaps help would be better */

      /* First check for a cpu selector.  */
      {
	char *cpu_name = xstrdup (argv[0]);
	char *hyphen = strchr (cpu_name, '-');
	if (hyphen)
	  *hyphen = 0;
	cpu = sim_cpu_lookup (sd, cpu_name);
	if (cpu)
	  {
	    /* If <cpuname>-<command>, point argv[0] at <command>.  */
	    if (hyphen)
	      {
		matching_argi = 0;
		argv[0] += hyphen - cpu_name + 1;
	      }
	    else
	      matching_argi = 1;
	    matching_opt = find_match (sd, cpu, argv, &matching_argi);
	    /* If hyphen found restore argv[0].  */
	    if (hyphen)
	      argv[0] -= hyphen - cpu_name + 1;
	  }
	free (cpu_name);
      }

      /* If that failed, try the main table.  */
      if (matching_opt == NULL)
	{
	  matching_argi = 0;
	  matching_opt = find_match (sd, NULL, argv, &matching_argi);
	}

      if (matching_opt != NULL)
	{
	  switch (matching_opt->opt.has_arg)
	    {
	    case no_argument:
	      if (argv [matching_argi + 1] == NULL)
		matching_opt->handler (sd, cpu, matching_opt->opt.val,
				       NULL, 1/*is_command*/);
	      else
		sim_io_eprintf (sd, "Command `%s' takes no arguments\n",
				matching_opt->opt.name);
	      break;
	    case optional_argument:
	      if (argv [matching_argi + 1] == NULL)
		matching_opt->handler (sd, cpu, matching_opt->opt.val,
				       NULL, 1/*is_command*/);
	      else if (argv [matching_argi + 2] == NULL)
		matching_opt->handler (sd, cpu, matching_opt->opt.val,
				       argv [matching_argi + 1], 1/*is_command*/);
	      else
		sim_io_eprintf (sd, "Command `%s' requires no more than one argument\n",
				matching_opt->opt.name);
	      break;
	    case required_argument:
	      if (argv [matching_argi + 1] == NULL)
		sim_io_eprintf (sd, "Command `%s' requires an argument\n",
				matching_opt->opt.name);
	      else if (argv [matching_argi + 2] == NULL)
		matching_opt->handler (sd, cpu, matching_opt->opt.val,
				       argv [matching_argi + 1], 1/*is_command*/);
	      else
		sim_io_eprintf (sd, "Command `%s' requires only one argument\n",
				matching_opt->opt.name);
	    }
	  freeargv (argv);
	  return SIM_RC_OK;
	}

      freeargv (argv);
    }
      
  /* didn't find anything that remotly matched */
  return SIM_RC_FAIL;
}