238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
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/* Command line option handling.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "intl.h"
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#include "coretypes.h"
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#include "opts.h"
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/* Perform a binary search to find which option the command-line INPUT
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matches. Returns its index in the option array, and N_OPTS
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(cl_options_count) on failure.
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This routine is quite subtle. A normal binary search is not good
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enough because some options can be suffixed with an argument, and
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multiple sub-matches can occur, e.g. input of "-pedantic" matching
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the initial substring of "-pedantic-errors".
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A more complicated example is -gstabs. It should match "-g" with
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an argument of "stabs". Suppose, however, that the number and list
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of switches are such that the binary search tests "-gen-decls"
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before having tested "-g". This doesn't match, and as "-gen-decls"
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is less than "-gstabs", it will become the lower bound of the
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binary search range, and "-g" will never be seen. To resolve this
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issue, opts.sh makes "-gen-decls" point, via the back_chain member,
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to "-g" so that failed searches that end between "-gen-decls" and
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the lexicographically subsequent switch know to go back and see if
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"-g" causes a match (which it does in this example).
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This search is done in such a way that the longest match for the
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front end in question wins. If there is no match for the current
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front end, the longest match for a different front end is returned
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(or N_OPTS if none) and the caller emits an error message. */
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size_t
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find_opt (const char *input, int lang_mask)
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{
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size_t mn, mx, md, opt_len;
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size_t match_wrong_lang;
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int comp;
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mn = 0;
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mx = cl_options_count;
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/* Find mn such this lexicographical inequality holds:
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cl_options[mn] <= input < cl_options[mn + 1]. */
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while (mx - mn > 1)
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{
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md = (mn + mx) / 2;
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opt_len = cl_options[md].opt_len;
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comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
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if (comp < 0)
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mx = md;
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else
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mn = md;
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}
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/* This is the switch that is the best match but for a different
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front end, or cl_options_count if there is no match at all. */
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match_wrong_lang = cl_options_count;
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/* Backtrace the chain of possible matches, returning the longest
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one, if any, that fits best. With current GCC switches, this
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loop executes at most twice. */
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do
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{
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const struct cl_option *opt = &cl_options[mn];
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/* Is the input either an exact match or a prefix that takes a
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joined argument? */
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if (!strncmp (input, opt->opt_text + 1, opt->opt_len)
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&& (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
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{
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/* If language is OK, return it. */
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if (opt->flags & lang_mask)
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return mn;
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/* If we haven't remembered a prior match, remember this
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one. Any prior match is necessarily better. */
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if (match_wrong_lang == cl_options_count)
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match_wrong_lang = mn;
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}
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/* Try the next possibility. This is cl_options_count if there
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are no more. */
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mn = opt->back_chain;
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}
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while (mn != cl_options_count);
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/* Return the best wrong match, or cl_options_count if none. */
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return match_wrong_lang;
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}
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/* Return true if NEXT_OPT_IDX cancels OPT_IDX. Return false if the
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next one is the same as ORIG_NEXT_OPT_IDX. */
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static bool
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cancel_option (int opt_idx, int next_opt_idx, int orig_next_opt_idx)
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{
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/* An option can be canceled by the same option or an option with
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Negative. */
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if (cl_options [next_opt_idx].neg_index == opt_idx)
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return true;
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if (cl_options [next_opt_idx].neg_index != orig_next_opt_idx)
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return cancel_option (opt_idx, cl_options [next_opt_idx].neg_index,
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orig_next_opt_idx);
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return false;
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}
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/* Filter out options canceled by the ones after them. */
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void
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prune_options (int *argcp, char ***argvp)
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{
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int argc = *argcp;
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int *options = xmalloc (argc * sizeof (*options));
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char **argv = xmalloc (argc * sizeof (char *));
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int i, arg_count, need_prune = 0;
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const struct cl_option *option;
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size_t opt_index;
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/* Scan all arguments. */
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for (i = 1; i < argc; i++)
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{
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int value = 1;
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const char *opt = (*argvp) [i];
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opt_index = find_opt (opt + 1, -1);
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if (opt_index == cl_options_count
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&& (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
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&& opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
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{
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char *dup;
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/* Drop the "no-" from negative switches. */
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size_t len = strlen (opt) - 3;
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dup = XNEWVEC (char, len + 1);
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dup[0] = '-';
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dup[1] = opt[1];
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memcpy (dup + 2, opt + 5, len - 2 + 1);
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opt = dup;
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value = 0;
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opt_index = find_opt (opt + 1, -1);
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free (dup);
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}
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if (opt_index == cl_options_count)
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{
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cont:
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options [i] = 0;
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continue;
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}
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option = &cl_options[opt_index];
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if (option->neg_index < 0)
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goto cont;
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/* Skip joined switches. */
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if ((option->flags & CL_JOINED))
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goto cont;
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/* Reject negative form of switches that don't take negatives as
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unrecognized. */
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if (!value && (option->flags & CL_REJECT_NEGATIVE))
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goto cont;
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options [i] = (int) opt_index;
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need_prune |= options [i];
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}
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if (!need_prune)
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goto done;
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/* Remove arguments which are negated by others after them. */
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argv [0] = (*argvp) [0];
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arg_count = 1;
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for (i = 1; i < argc; i++)
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{
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int j, opt_idx;
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opt_idx = options [i];
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if (opt_idx)
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{
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int next_opt_idx;
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for (j = i + 1; j < argc; j++)
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{
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next_opt_idx = options [j];
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if (next_opt_idx
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&& cancel_option (opt_idx, next_opt_idx,
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next_opt_idx))
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break;
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}
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}
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else
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goto keep;
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if (j == argc)
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{
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keep:
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argv [arg_count] = (*argvp) [i];
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arg_count++;
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}
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}
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if (arg_count != argc)
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{
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*argcp = arg_count;
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*argvp = argv;
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}
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else
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{
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done:
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free (argv);
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}
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free (options);
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}
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