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3844e605e6
Completion routines that use a custom word point, and that then recurse into complete_line (e.g., if we make "thread apply" a custom word point completer, and complete on the command passed as argument), we stumble on this latent bug: (gdb) thread apply all pri[TAB] (gdb) thread apply all priprint The problem is that there's a spot in complete_line_internal_1 that rewinds the completion word but does not reflect that change in the custom word point in the tracker. This patch fixes it. gdb/ChangeLog: 2019-06-13 Pedro Alves <palves@redhat.com> * completer.c (complete_line_internal_1): Rewind completion word point. (completion_tracker::advance_custom_word_point_by): Change parameter type to int. * completer.h (completion_tracker::advance_custom_word_point_by): Likewise.
2910 lines
80 KiB
C
2910 lines
80 KiB
C
/* Line completion stuff for GDB, the GNU debugger.
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Copyright (C) 2000-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "filenames.h" /* For DOSish file names. */
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#include "language.h"
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#include "common/gdb_signals.h"
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#include "target.h"
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#include "reggroups.h"
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#include "user-regs.h"
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#include "arch-utils.h"
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#include "location.h"
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#include <algorithm>
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#include "linespec.h"
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#include "cli/cli-decode.h"
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/* FIXME: This is needed because of lookup_cmd_1 (). We should be
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calling a hook instead so we eliminate the CLI dependency. */
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#include "gdbcmd.h"
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/* Needed for rl_completer_word_break_characters() and for
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rl_filename_completion_function. */
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#include "readline/readline.h"
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/* readline defines this. */
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#undef savestring
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#include "completer.h"
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/* Misc state that needs to be tracked across several different
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readline completer entry point calls, all related to a single
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completion invocation. */
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struct gdb_completer_state
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{
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/* The current completion's completion tracker. This is a global
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because a tracker can be shared between the handle_brkchars and
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handle_completion phases, which involves different readline
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callbacks. */
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completion_tracker *tracker = NULL;
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/* Whether the current completion was aborted. */
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bool aborted = false;
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};
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/* The current completion state. */
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static gdb_completer_state current_completion;
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/* An enumeration of the various things a user might attempt to
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complete for a location. If you change this, remember to update
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the explicit_options array below too. */
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enum explicit_location_match_type
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{
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/* The filename of a source file. */
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MATCH_SOURCE,
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/* The name of a function or method. */
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MATCH_FUNCTION,
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/* The fully-qualified name of a function or method. */
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MATCH_QUALIFIED,
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/* A line number. */
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MATCH_LINE,
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/* The name of a label. */
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MATCH_LABEL
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};
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/* Prototypes for local functions. */
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/* readline uses the word breaks for two things:
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(1) In figuring out where to point the TEXT parameter to the
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rl_completion_entry_function. Since we don't use TEXT for much,
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it doesn't matter a lot what the word breaks are for this purpose,
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but it does affect how much stuff M-? lists.
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(2) If one of the matches contains a word break character, readline
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will quote it. That's why we switch between
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current_language->la_word_break_characters() and
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gdb_completer_command_word_break_characters. I'm not sure when
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we need this behavior (perhaps for funky characters in C++
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symbols?). */
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/* Variables which are necessary for fancy command line editing. */
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/* When completing on command names, we remove '-' from the list of
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word break characters, since we use it in command names. If the
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readline library sees one in any of the current completion strings,
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it thinks that the string needs to be quoted and automatically
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supplies a leading quote. */
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static const char gdb_completer_command_word_break_characters[] =
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" \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,";
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/* When completing on file names, we remove from the list of word
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break characters any characters that are commonly used in file
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names, such as '-', '+', '~', etc. Otherwise, readline displays
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incorrect completion candidates. */
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/* MS-DOS and MS-Windows use colon as part of the drive spec, and most
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programs support @foo style response files. */
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static const char gdb_completer_file_name_break_characters[] =
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#ifdef HAVE_DOS_BASED_FILE_SYSTEM
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" \t\n*|\"';?><@";
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#else
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" \t\n*|\"';:?><";
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#endif
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/* Characters that can be used to quote completion strings. Note that
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we can't include '"' because the gdb C parser treats such quoted
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sequences as strings. */
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static const char gdb_completer_quote_characters[] = "'";
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/* Accessor for some completer data that may interest other files. */
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const char *
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get_gdb_completer_quote_characters (void)
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{
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return gdb_completer_quote_characters;
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}
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/* This can be used for functions which don't want to complete on
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symbols but don't want to complete on anything else either. */
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void
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noop_completer (struct cmd_list_element *ignore,
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completion_tracker &tracker,
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const char *text, const char *prefix)
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{
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}
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/* Complete on filenames. */
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void
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filename_completer (struct cmd_list_element *ignore,
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completion_tracker &tracker,
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const char *text, const char *word)
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{
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int subsequent_name;
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subsequent_name = 0;
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while (1)
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{
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gdb::unique_xmalloc_ptr<char> p_rl
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(rl_filename_completion_function (text, subsequent_name));
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if (p_rl == NULL)
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break;
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/* We need to set subsequent_name to a non-zero value before the
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continue line below, because otherwise, if the first file
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seen by GDB is a backup file whose name ends in a `~', we
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will loop indefinitely. */
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subsequent_name = 1;
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/* Like emacs, don't complete on old versions. Especially
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useful in the "source" command. */
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const char *p = p_rl.get ();
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if (p[strlen (p) - 1] == '~')
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continue;
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tracker.add_completion
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(make_completion_match_str (std::move (p_rl), text, word));
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}
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#if 0
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/* There is no way to do this just long enough to affect quote
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inserting without also affecting the next completion. This
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should be fixed in readline. FIXME. */
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/* Ensure that readline does the right thing
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with respect to inserting quotes. */
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rl_completer_word_break_characters = "";
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#endif
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}
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/* The corresponding completer_handle_brkchars
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implementation. */
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static void
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filename_completer_handle_brkchars (struct cmd_list_element *ignore,
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completion_tracker &tracker,
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const char *text, const char *word)
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{
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set_rl_completer_word_break_characters
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(gdb_completer_file_name_break_characters);
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}
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/* Possible values for the found_quote flags word used by the completion
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functions. It says what kind of (shell-like) quoting we found anywhere
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in the line. */
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#define RL_QF_SINGLE_QUOTE 0x01
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#define RL_QF_DOUBLE_QUOTE 0x02
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#define RL_QF_BACKSLASH 0x04
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#define RL_QF_OTHER_QUOTE 0x08
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/* Find the bounds of the current word for completion purposes, and
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return a pointer to the end of the word. This mimics (and is a
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modified version of) readline's _rl_find_completion_word internal
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function.
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This function skips quoted substrings (characters between matched
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pairs of characters in rl_completer_quote_characters). We try to
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find an unclosed quoted substring on which to do matching. If one
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is not found, we use the word break characters to find the
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boundaries of the current word. QC, if non-null, is set to the
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opening quote character if we found an unclosed quoted substring,
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'\0' otherwise. DP, if non-null, is set to the value of the
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delimiter character that caused a word break. */
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struct gdb_rl_completion_word_info
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{
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const char *word_break_characters;
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const char *quote_characters;
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const char *basic_quote_characters;
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};
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static const char *
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gdb_rl_find_completion_word (struct gdb_rl_completion_word_info *info,
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int *qc, int *dp,
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const char *line_buffer)
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{
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int scan, end, found_quote, delimiter, pass_next, isbrk;
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char quote_char;
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const char *brkchars;
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int point = strlen (line_buffer);
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/* The algorithm below does '--point'. Avoid buffer underflow with
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the empty string. */
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if (point == 0)
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{
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if (qc != NULL)
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*qc = '\0';
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if (dp != NULL)
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*dp = '\0';
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return line_buffer;
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}
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end = point;
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found_quote = delimiter = 0;
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quote_char = '\0';
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brkchars = info->word_break_characters;
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if (info->quote_characters != NULL)
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{
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/* We have a list of characters which can be used in pairs to
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quote substrings for the completer. Try to find the start of
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an unclosed quoted substring. */
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/* FOUND_QUOTE is set so we know what kind of quotes we
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found. */
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for (scan = pass_next = 0;
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scan < end;
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scan++)
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{
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if (pass_next)
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{
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pass_next = 0;
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continue;
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}
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/* Shell-like semantics for single quotes -- don't allow
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backslash to quote anything in single quotes, especially
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not the closing quote. If you don't like this, take out
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the check on the value of quote_char. */
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if (quote_char != '\'' && line_buffer[scan] == '\\')
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{
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pass_next = 1;
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found_quote |= RL_QF_BACKSLASH;
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continue;
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}
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if (quote_char != '\0')
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{
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/* Ignore everything until the matching close quote
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char. */
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if (line_buffer[scan] == quote_char)
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{
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/* Found matching close. Abandon this
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substring. */
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quote_char = '\0';
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point = end;
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}
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}
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else if (strchr (info->quote_characters, line_buffer[scan]))
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{
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/* Found start of a quoted substring. */
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quote_char = line_buffer[scan];
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point = scan + 1;
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/* Shell-like quoting conventions. */
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if (quote_char == '\'')
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found_quote |= RL_QF_SINGLE_QUOTE;
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else if (quote_char == '"')
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found_quote |= RL_QF_DOUBLE_QUOTE;
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else
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found_quote |= RL_QF_OTHER_QUOTE;
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}
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}
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}
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if (point == end && quote_char == '\0')
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{
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/* We didn't find an unclosed quoted substring upon which to do
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completion, so use the word break characters to find the
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substring on which to complete. */
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while (--point)
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{
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scan = line_buffer[point];
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if (strchr (brkchars, scan) != 0)
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break;
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}
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}
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/* If we are at an unquoted word break, then advance past it. */
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scan = line_buffer[point];
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if (scan)
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{
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isbrk = strchr (brkchars, scan) != 0;
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if (isbrk)
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{
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/* If the character that caused the word break was a quoting
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character, then remember it as the delimiter. */
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if (info->basic_quote_characters
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&& strchr (info->basic_quote_characters, scan)
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&& (end - point) > 1)
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delimiter = scan;
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point++;
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}
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}
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if (qc != NULL)
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*qc = quote_char;
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if (dp != NULL)
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*dp = delimiter;
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return line_buffer + point;
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}
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/* See completer.h. */
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const char *
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advance_to_expression_complete_word_point (completion_tracker &tracker,
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const char *text)
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{
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gdb_rl_completion_word_info info;
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info.word_break_characters
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= current_language->la_word_break_characters ();
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info.quote_characters = gdb_completer_quote_characters;
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info.basic_quote_characters = rl_basic_quote_characters;
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int delimiter;
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const char *start
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= gdb_rl_find_completion_word (&info, NULL, &delimiter, text);
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tracker.advance_custom_word_point_by (start - text);
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if (delimiter)
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{
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tracker.set_quote_char (delimiter);
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tracker.set_suppress_append_ws (true);
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}
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return start;
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}
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/* See completer.h. */
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bool
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completion_tracker::completes_to_completion_word (const char *word)
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{
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if (m_lowest_common_denominator_unique)
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{
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const char *lcd = m_lowest_common_denominator;
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if (strncmp_iw (word, lcd, strlen (lcd)) == 0)
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{
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/* Maybe skip the function and complete on keywords. */
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size_t wordlen = strlen (word);
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if (word[wordlen - 1] == ' ')
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return true;
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}
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}
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return false;
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}
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/* Complete on linespecs, which might be of two possible forms:
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file:line
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or
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symbol+offset
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This is intended to be used in commands that set breakpoints
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etc. */
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static void
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complete_files_symbols (completion_tracker &tracker,
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const char *text, const char *word)
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{
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completion_list fn_list;
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const char *p;
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int quote_found = 0;
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int quoted = *text == '\'' || *text == '"';
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int quote_char = '\0';
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const char *colon = NULL;
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char *file_to_match = NULL;
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const char *symbol_start = text;
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const char *orig_text = text;
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/* Do we have an unquoted colon, as in "break foo.c:bar"? */
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for (p = text; *p != '\0'; ++p)
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{
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if (*p == '\\' && p[1] == '\'')
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p++;
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else if (*p == '\'' || *p == '"')
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{
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quote_found = *p;
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quote_char = *p++;
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while (*p != '\0' && *p != quote_found)
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{
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if (*p == '\\' && p[1] == quote_found)
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p++;
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p++;
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}
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if (*p == quote_found)
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quote_found = 0;
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else
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break; /* Hit the end of text. */
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}
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#if HAVE_DOS_BASED_FILE_SYSTEM
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/* If we have a DOS-style absolute file name at the beginning of
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TEXT, and the colon after the drive letter is the only colon
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we found, pretend the colon is not there. */
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else if (p < text + 3 && *p == ':' && p == text + 1 + quoted)
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;
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#endif
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else if (*p == ':' && !colon)
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{
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colon = p;
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symbol_start = p + 1;
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}
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else if (strchr (current_language->la_word_break_characters(), *p))
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symbol_start = p + 1;
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}
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if (quoted)
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text++;
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/* Where is the file name? */
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if (colon)
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{
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char *s;
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file_to_match = (char *) xmalloc (colon - text + 1);
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strncpy (file_to_match, text, colon - text);
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file_to_match[colon - text] = '\0';
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/* Remove trailing colons and quotes from the file name. */
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for (s = file_to_match + (colon - text);
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s > file_to_match;
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s--)
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if (*s == ':' || *s == quote_char)
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*s = '\0';
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}
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/* If the text includes a colon, they want completion only on a
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symbol name after the colon. Otherwise, we need to complete on
|
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symbols as well as on files. */
|
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if (colon)
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{
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collect_file_symbol_completion_matches (tracker,
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complete_symbol_mode::EXPRESSION,
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symbol_name_match_type::EXPRESSION,
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symbol_start, word,
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file_to_match);
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xfree (file_to_match);
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}
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||
else
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||
{
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||
size_t text_len = strlen (text);
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||
|
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collect_symbol_completion_matches (tracker,
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||
complete_symbol_mode::EXPRESSION,
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symbol_name_match_type::EXPRESSION,
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symbol_start, word);
|
||
/* If text includes characters which cannot appear in a file
|
||
name, they cannot be asking for completion on files. */
|
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if (strcspn (text,
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gdb_completer_file_name_break_characters) == text_len)
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fn_list = make_source_files_completion_list (text, text);
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}
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|
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if (!fn_list.empty () && !tracker.have_completions ())
|
||
{
|
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/* If we only have file names as possible completion, we should
|
||
bring them in sync with what rl_complete expects. The
|
||
problem is that if the user types "break /foo/b TAB", and the
|
||
possible completions are "/foo/bar" and "/foo/baz"
|
||
rl_complete expects us to return "bar" and "baz", without the
|
||
leading directories, as possible completions, because `word'
|
||
starts at the "b". But we ignore the value of `word' when we
|
||
call make_source_files_completion_list above (because that
|
||
would not DTRT when the completion results in both symbols
|
||
and file names), so make_source_files_completion_list returns
|
||
the full "/foo/bar" and "/foo/baz" strings. This produces
|
||
wrong results when, e.g., there's only one possible
|
||
completion, because rl_complete will prepend "/foo/" to each
|
||
candidate completion. The loop below removes that leading
|
||
part. */
|
||
for (const auto &fn_up: fn_list)
|
||
{
|
||
char *fn = fn_up.get ();
|
||
memmove (fn, fn + (word - text), strlen (fn) + 1 - (word - text));
|
||
}
|
||
}
|
||
|
||
tracker.add_completions (std::move (fn_list));
|
||
|
||
if (!tracker.have_completions ())
|
||
{
|
||
/* No completions at all. As the final resort, try completing
|
||
on the entire text as a symbol. */
|
||
collect_symbol_completion_matches (tracker,
|
||
complete_symbol_mode::EXPRESSION,
|
||
symbol_name_match_type::EXPRESSION,
|
||
orig_text, word);
|
||
}
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
completion_list
|
||
complete_source_filenames (const char *text)
|
||
{
|
||
size_t text_len = strlen (text);
|
||
|
||
/* If text includes characters which cannot appear in a file name,
|
||
the user cannot be asking for completion on files. */
|
||
if (strcspn (text,
|
||
gdb_completer_file_name_break_characters)
|
||
== text_len)
|
||
return make_source_files_completion_list (text, text);
|
||
|
||
return {};
|
||
}
|
||
|
||
/* Complete address and linespec locations. */
|
||
|
||
static void
|
||
complete_address_and_linespec_locations (completion_tracker &tracker,
|
||
const char *text,
|
||
symbol_name_match_type match_type)
|
||
{
|
||
if (*text == '*')
|
||
{
|
||
tracker.advance_custom_word_point_by (1);
|
||
text++;
|
||
const char *word
|
||
= advance_to_expression_complete_word_point (tracker, text);
|
||
complete_expression (tracker, text, word);
|
||
}
|
||
else
|
||
{
|
||
linespec_complete (tracker, text, match_type);
|
||
}
|
||
}
|
||
|
||
/* The explicit location options. Note that indexes into this array
|
||
must match the explicit_location_match_type enumerators. */
|
||
|
||
static const char *const explicit_options[] =
|
||
{
|
||
"-source",
|
||
"-function",
|
||
"-qualified",
|
||
"-line",
|
||
"-label",
|
||
NULL
|
||
};
|
||
|
||
/* The probe modifier options. These can appear before a location in
|
||
breakpoint commands. */
|
||
static const char *const probe_options[] =
|
||
{
|
||
"-probe",
|
||
"-probe-stap",
|
||
"-probe-dtrace",
|
||
NULL
|
||
};
|
||
|
||
/* Returns STRING if not NULL, the empty string otherwise. */
|
||
|
||
static const char *
|
||
string_or_empty (const char *string)
|
||
{
|
||
return string != NULL ? string : "";
|
||
}
|
||
|
||
/* A helper function to collect explicit location matches for the given
|
||
LOCATION, which is attempting to match on WORD. */
|
||
|
||
static void
|
||
collect_explicit_location_matches (completion_tracker &tracker,
|
||
struct event_location *location,
|
||
enum explicit_location_match_type what,
|
||
const char *word,
|
||
const struct language_defn *language)
|
||
{
|
||
const struct explicit_location *explicit_loc
|
||
= get_explicit_location (location);
|
||
|
||
/* True if the option expects an argument. */
|
||
bool needs_arg = true;
|
||
|
||
/* Note, in the various MATCH_* below, we complete on
|
||
explicit_loc->foo instead of WORD, because only the former will
|
||
have already skipped past any quote char. */
|
||
switch (what)
|
||
{
|
||
case MATCH_SOURCE:
|
||
{
|
||
const char *source = string_or_empty (explicit_loc->source_filename);
|
||
completion_list matches
|
||
= make_source_files_completion_list (source, source);
|
||
tracker.add_completions (std::move (matches));
|
||
}
|
||
break;
|
||
|
||
case MATCH_FUNCTION:
|
||
{
|
||
const char *function = string_or_empty (explicit_loc->function_name);
|
||
linespec_complete_function (tracker, function,
|
||
explicit_loc->func_name_match_type,
|
||
explicit_loc->source_filename);
|
||
}
|
||
break;
|
||
|
||
case MATCH_QUALIFIED:
|
||
needs_arg = false;
|
||
break;
|
||
case MATCH_LINE:
|
||
/* Nothing to offer. */
|
||
break;
|
||
|
||
case MATCH_LABEL:
|
||
{
|
||
const char *label = string_or_empty (explicit_loc->label_name);
|
||
linespec_complete_label (tracker, language,
|
||
explicit_loc->source_filename,
|
||
explicit_loc->function_name,
|
||
explicit_loc->func_name_match_type,
|
||
label);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
gdb_assert_not_reached ("unhandled explicit_location_match_type");
|
||
}
|
||
|
||
if (!needs_arg || tracker.completes_to_completion_word (word))
|
||
{
|
||
tracker.discard_completions ();
|
||
tracker.advance_custom_word_point_by (strlen (word));
|
||
complete_on_enum (tracker, explicit_options, "", "");
|
||
complete_on_enum (tracker, linespec_keywords, "", "");
|
||
}
|
||
else if (!tracker.have_completions ())
|
||
{
|
||
/* Maybe we have an unterminated linespec keyword at the tail of
|
||
the string. Try completing on that. */
|
||
size_t wordlen = strlen (word);
|
||
const char *keyword = word + wordlen;
|
||
|
||
if (wordlen > 0 && keyword[-1] != ' ')
|
||
{
|
||
while (keyword > word && *keyword != ' ')
|
||
keyword--;
|
||
/* Don't complete on keywords if we'd be completing on the
|
||
whole explicit linespec option. E.g., "b -function
|
||
thr<tab>" should not complete to the "thread"
|
||
keyword. */
|
||
if (keyword != word)
|
||
{
|
||
keyword = skip_spaces (keyword);
|
||
|
||
tracker.advance_custom_word_point_by (keyword - word);
|
||
complete_on_enum (tracker, linespec_keywords, keyword, keyword);
|
||
}
|
||
}
|
||
else if (wordlen > 0 && keyword[-1] == ' ')
|
||
{
|
||
/* Assume that we're maybe past the explicit location
|
||
argument, and we didn't manage to find any match because
|
||
the user wants to create a pending breakpoint. Offer the
|
||
keyword and explicit location options as possible
|
||
completions. */
|
||
tracker.advance_custom_word_point_by (keyword - word);
|
||
complete_on_enum (tracker, linespec_keywords, keyword, keyword);
|
||
complete_on_enum (tracker, explicit_options, keyword, keyword);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If the next word in *TEXT_P is any of the keywords in KEYWORDS,
|
||
then advance both TEXT_P and the word point in the tracker past the
|
||
keyword and return the (0-based) index in the KEYWORDS array that
|
||
matched. Otherwise, return -1. */
|
||
|
||
static int
|
||
skip_keyword (completion_tracker &tracker,
|
||
const char * const *keywords, const char **text_p)
|
||
{
|
||
const char *text = *text_p;
|
||
const char *after = skip_to_space (text);
|
||
size_t len = after - text;
|
||
|
||
if (text[len] != ' ')
|
||
return -1;
|
||
|
||
int found = -1;
|
||
for (int i = 0; keywords[i] != NULL; i++)
|
||
{
|
||
if (strncmp (keywords[i], text, len) == 0)
|
||
{
|
||
if (found == -1)
|
||
found = i;
|
||
else
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
if (found != -1)
|
||
{
|
||
tracker.advance_custom_word_point_by (len + 1);
|
||
text += len + 1;
|
||
*text_p = text;
|
||
return found;
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* A completer function for explicit locations. This function
|
||
completes both options ("-source", "-line", etc) and values. If
|
||
completing a quoted string, then QUOTED_ARG_START and
|
||
QUOTED_ARG_END point to the quote characters. LANGUAGE is the
|
||
current language. */
|
||
|
||
static void
|
||
complete_explicit_location (completion_tracker &tracker,
|
||
struct event_location *location,
|
||
const char *text,
|
||
const language_defn *language,
|
||
const char *quoted_arg_start,
|
||
const char *quoted_arg_end)
|
||
{
|
||
if (*text != '-')
|
||
return;
|
||
|
||
int keyword = skip_keyword (tracker, explicit_options, &text);
|
||
|
||
if (keyword == -1)
|
||
complete_on_enum (tracker, explicit_options, text, text);
|
||
else
|
||
{
|
||
/* Completing on value. */
|
||
enum explicit_location_match_type what
|
||
= (explicit_location_match_type) keyword;
|
||
|
||
if (quoted_arg_start != NULL && quoted_arg_end != NULL)
|
||
{
|
||
if (quoted_arg_end[1] == '\0')
|
||
{
|
||
/* If completing a quoted string with the cursor right
|
||
at the terminating quote char, complete the
|
||
completion word without interpretation, so that
|
||
readline advances the cursor one whitespace past the
|
||
quote, even if there's no match. This makes these
|
||
cases behave the same:
|
||
|
||
before: "b -function function()"
|
||
after: "b -function function() "
|
||
|
||
before: "b -function 'function()'"
|
||
after: "b -function 'function()' "
|
||
|
||
and trusts the user in this case:
|
||
|
||
before: "b -function 'not_loaded_function_yet()'"
|
||
after: "b -function 'not_loaded_function_yet()' "
|
||
*/
|
||
tracker.add_completion (make_unique_xstrdup (text));
|
||
}
|
||
else if (quoted_arg_end[1] == ' ')
|
||
{
|
||
/* We're maybe past the explicit location argument.
|
||
Skip the argument without interpretion, assuming the
|
||
user may want to create pending breakpoint. Offer
|
||
the keyword and explicit location options as possible
|
||
completions. */
|
||
tracker.advance_custom_word_point_by (strlen (text));
|
||
complete_on_enum (tracker, linespec_keywords, "", "");
|
||
complete_on_enum (tracker, explicit_options, "", "");
|
||
}
|
||
return;
|
||
}
|
||
|
||
/* Now gather matches */
|
||
collect_explicit_location_matches (tracker, location, what, text,
|
||
language);
|
||
}
|
||
}
|
||
|
||
/* A completer for locations. */
|
||
|
||
void
|
||
location_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char * /* word */)
|
||
{
|
||
int found_probe_option = -1;
|
||
|
||
/* If we have a probe modifier, skip it. This can only appear as
|
||
first argument. Until we have a specific completer for probes,
|
||
falling back to the linespec completer for the remainder of the
|
||
line is better than nothing. */
|
||
if (text[0] == '-' && text[1] == 'p')
|
||
found_probe_option = skip_keyword (tracker, probe_options, &text);
|
||
|
||
const char *option_text = text;
|
||
int saved_word_point = tracker.custom_word_point ();
|
||
|
||
const char *copy = text;
|
||
|
||
explicit_completion_info completion_info;
|
||
event_location_up location
|
||
= string_to_explicit_location (©, current_language,
|
||
&completion_info);
|
||
if (completion_info.quoted_arg_start != NULL
|
||
&& completion_info.quoted_arg_end == NULL)
|
||
{
|
||
/* Found an unbalanced quote. */
|
||
tracker.set_quote_char (*completion_info.quoted_arg_start);
|
||
tracker.advance_custom_word_point_by (1);
|
||
}
|
||
|
||
if (completion_info.saw_explicit_location_option)
|
||
{
|
||
if (*copy != '\0')
|
||
{
|
||
tracker.advance_custom_word_point_by (copy - text);
|
||
text = copy;
|
||
|
||
/* We found a terminator at the tail end of the string,
|
||
which means we're past the explicit location options. We
|
||
may have a keyword to complete on. If we have a whole
|
||
keyword, then complete whatever comes after as an
|
||
expression. This is mainly for the "if" keyword. If the
|
||
"thread" and "task" keywords gain their own completers,
|
||
they should be used here. */
|
||
int keyword = skip_keyword (tracker, linespec_keywords, &text);
|
||
|
||
if (keyword == -1)
|
||
{
|
||
complete_on_enum (tracker, linespec_keywords, text, text);
|
||
}
|
||
else
|
||
{
|
||
const char *word
|
||
= advance_to_expression_complete_word_point (tracker, text);
|
||
complete_expression (tracker, text, word);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
tracker.advance_custom_word_point_by (completion_info.last_option
|
||
- text);
|
||
text = completion_info.last_option;
|
||
|
||
complete_explicit_location (tracker, location.get (), text,
|
||
current_language,
|
||
completion_info.quoted_arg_start,
|
||
completion_info.quoted_arg_end);
|
||
|
||
}
|
||
}
|
||
/* This is an address or linespec location. */
|
||
else if (location != NULL)
|
||
{
|
||
/* Handle non-explicit location options. */
|
||
|
||
int keyword = skip_keyword (tracker, explicit_options, &text);
|
||
if (keyword == -1)
|
||
complete_on_enum (tracker, explicit_options, text, text);
|
||
else
|
||
{
|
||
tracker.advance_custom_word_point_by (copy - text);
|
||
text = copy;
|
||
|
||
symbol_name_match_type match_type
|
||
= get_explicit_location (location.get ())->func_name_match_type;
|
||
complete_address_and_linespec_locations (tracker, text, match_type);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* No options. */
|
||
complete_address_and_linespec_locations (tracker, text,
|
||
symbol_name_match_type::WILD);
|
||
}
|
||
|
||
/* Add matches for option names, if either:
|
||
|
||
- Some completer above found some matches, but the word point did
|
||
not advance (e.g., "b <tab>" finds all functions, or "b -<tab>"
|
||
matches all objc selectors), or;
|
||
|
||
- Some completer above advanced the word point, but found no
|
||
matches.
|
||
*/
|
||
if ((text[0] == '-' || text[0] == '\0')
|
||
&& (!tracker.have_completions ()
|
||
|| tracker.custom_word_point () == saved_word_point))
|
||
{
|
||
tracker.set_custom_word_point (saved_word_point);
|
||
text = option_text;
|
||
|
||
if (found_probe_option == -1)
|
||
complete_on_enum (tracker, probe_options, text, text);
|
||
complete_on_enum (tracker, explicit_options, text, text);
|
||
}
|
||
}
|
||
|
||
/* The corresponding completer_handle_brkchars
|
||
implementation. */
|
||
|
||
static void
|
||
location_completer_handle_brkchars (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text,
|
||
const char *word_ignored)
|
||
{
|
||
tracker.set_use_custom_word_point (true);
|
||
|
||
location_completer (ignore, tracker, text, NULL);
|
||
}
|
||
|
||
/* Helper for expression_completer which recursively adds field and
|
||
method names from TYPE, a struct or union type, to the OUTPUT
|
||
list. */
|
||
|
||
static void
|
||
add_struct_fields (struct type *type, completion_list &output,
|
||
const char *fieldname, int namelen)
|
||
{
|
||
int i;
|
||
int computed_type_name = 0;
|
||
const char *type_name = NULL;
|
||
|
||
type = check_typedef (type);
|
||
for (i = 0; i < TYPE_NFIELDS (type); ++i)
|
||
{
|
||
if (i < TYPE_N_BASECLASSES (type))
|
||
add_struct_fields (TYPE_BASECLASS (type, i),
|
||
output, fieldname, namelen);
|
||
else if (TYPE_FIELD_NAME (type, i))
|
||
{
|
||
if (TYPE_FIELD_NAME (type, i)[0] != '\0')
|
||
{
|
||
if (! strncmp (TYPE_FIELD_NAME (type, i),
|
||
fieldname, namelen))
|
||
output.emplace_back (xstrdup (TYPE_FIELD_NAME (type, i)));
|
||
}
|
||
else if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_UNION)
|
||
{
|
||
/* Recurse into anonymous unions. */
|
||
add_struct_fields (TYPE_FIELD_TYPE (type, i),
|
||
output, fieldname, namelen);
|
||
}
|
||
}
|
||
}
|
||
|
||
for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
|
||
{
|
||
const char *name = TYPE_FN_FIELDLIST_NAME (type, i);
|
||
|
||
if (name && ! strncmp (name, fieldname, namelen))
|
||
{
|
||
if (!computed_type_name)
|
||
{
|
||
type_name = TYPE_NAME (type);
|
||
computed_type_name = 1;
|
||
}
|
||
/* Omit constructors from the completion list. */
|
||
if (!type_name || strcmp (type_name, name))
|
||
output.emplace_back (xstrdup (name));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
complete_expression (completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
struct type *type = NULL;
|
||
gdb::unique_xmalloc_ptr<char> fieldname;
|
||
enum type_code code = TYPE_CODE_UNDEF;
|
||
|
||
/* Perform a tentative parse of the expression, to see whether a
|
||
field completion is required. */
|
||
try
|
||
{
|
||
type = parse_expression_for_completion (text, &fieldname, &code);
|
||
}
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
return;
|
||
}
|
||
|
||
if (fieldname != nullptr && type)
|
||
{
|
||
for (;;)
|
||
{
|
||
type = check_typedef (type);
|
||
if (TYPE_CODE (type) != TYPE_CODE_PTR && !TYPE_IS_REFERENCE (type))
|
||
break;
|
||
type = TYPE_TARGET_TYPE (type);
|
||
}
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_UNION
|
||
|| TYPE_CODE (type) == TYPE_CODE_STRUCT)
|
||
{
|
||
completion_list result;
|
||
|
||
add_struct_fields (type, result, fieldname.get (),
|
||
strlen (fieldname.get ()));
|
||
tracker.add_completions (std::move (result));
|
||
return;
|
||
}
|
||
}
|
||
else if (fieldname != nullptr && code != TYPE_CODE_UNDEF)
|
||
{
|
||
collect_symbol_completion_matches_type (tracker, fieldname.get (),
|
||
fieldname.get (), code);
|
||
return;
|
||
}
|
||
|
||
complete_files_symbols (tracker, text, word);
|
||
}
|
||
|
||
/* Complete on expressions. Often this means completing on symbol
|
||
names, but some language parsers also have support for completing
|
||
field names. */
|
||
|
||
void
|
||
expression_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
complete_expression (tracker, text, word);
|
||
}
|
||
|
||
/* See definition in completer.h. */
|
||
|
||
void
|
||
set_rl_completer_word_break_characters (const char *break_chars)
|
||
{
|
||
rl_completer_word_break_characters = (char *) break_chars;
|
||
}
|
||
|
||
/* See definition in completer.h. */
|
||
|
||
void
|
||
set_gdb_completion_word_break_characters (completer_ftype *fn)
|
||
{
|
||
const char *break_chars;
|
||
|
||
/* So far we are only interested in differentiating filename
|
||
completers from everything else. */
|
||
if (fn == filename_completer)
|
||
break_chars = gdb_completer_file_name_break_characters;
|
||
else
|
||
break_chars = gdb_completer_command_word_break_characters;
|
||
|
||
set_rl_completer_word_break_characters (break_chars);
|
||
}
|
||
|
||
/* Complete on symbols. */
|
||
|
||
void
|
||
symbol_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
collect_symbol_completion_matches (tracker, complete_symbol_mode::EXPRESSION,
|
||
symbol_name_match_type::EXPRESSION,
|
||
text, word);
|
||
}
|
||
|
||
/* Here are some useful test cases for completion. FIXME: These
|
||
should be put in the test suite. They should be tested with both
|
||
M-? and TAB.
|
||
|
||
"show output-" "radix"
|
||
"show output" "-radix"
|
||
"p" ambiguous (commands starting with p--path, print, printf, etc.)
|
||
"p " ambiguous (all symbols)
|
||
"info t foo" no completions
|
||
"info t " no completions
|
||
"info t" ambiguous ("info target", "info terminal", etc.)
|
||
"info ajksdlfk" no completions
|
||
"info ajksdlfk " no completions
|
||
"info" " "
|
||
"info " ambiguous (all info commands)
|
||
"p \"a" no completions (string constant)
|
||
"p 'a" ambiguous (all symbols starting with a)
|
||
"p b-a" ambiguous (all symbols starting with a)
|
||
"p b-" ambiguous (all symbols)
|
||
"file Make" "file" (word break hard to screw up here)
|
||
"file ../gdb.stabs/we" "ird" (needs to not break word at slash)
|
||
*/
|
||
|
||
enum complete_line_internal_reason
|
||
{
|
||
/* Preliminary phase, called by gdb_completion_word_break_characters
|
||
function, is used to either:
|
||
|
||
#1 - Determine the set of chars that are word delimiters
|
||
depending on the current command in line_buffer.
|
||
|
||
#2 - Manually advance RL_POINT to the "word break" point instead
|
||
of letting readline do it (based on too-simple character
|
||
matching).
|
||
|
||
Simpler completers that just pass a brkchars array to readline
|
||
(#1 above) must defer generating the completions to the main
|
||
phase (below). No completion list should be generated in this
|
||
phase.
|
||
|
||
OTOH, completers that manually advance the word point(#2 above)
|
||
must set "use_custom_word_point" in the tracker and generate
|
||
their completion in this phase. Note that this is the convenient
|
||
thing to do since they'll be parsing the input line anyway. */
|
||
handle_brkchars,
|
||
|
||
/* Main phase, called by complete_line function, is used to get the
|
||
list of possible completions. */
|
||
handle_completions,
|
||
|
||
/* Special case when completing a 'help' command. In this case,
|
||
once sub-command completions are exhausted, we simply return
|
||
NULL. */
|
||
handle_help,
|
||
};
|
||
|
||
/* Helper for complete_line_internal to simplify it. */
|
||
|
||
static void
|
||
complete_line_internal_normal_command (completion_tracker &tracker,
|
||
const char *command, const char *word,
|
||
const char *cmd_args,
|
||
complete_line_internal_reason reason,
|
||
struct cmd_list_element *c)
|
||
{
|
||
const char *p = cmd_args;
|
||
|
||
if (c->completer == filename_completer)
|
||
{
|
||
/* Many commands which want to complete on file names accept
|
||
several file names, as in "run foo bar >>baz". So we don't
|
||
want to complete the entire text after the command, just the
|
||
last word. To this end, we need to find the beginning of the
|
||
file name by starting at `word' and going backwards. */
|
||
for (p = word;
|
||
p > command
|
||
&& strchr (gdb_completer_file_name_break_characters,
|
||
p[-1]) == NULL;
|
||
p--)
|
||
;
|
||
}
|
||
|
||
if (reason == handle_brkchars)
|
||
{
|
||
completer_handle_brkchars_ftype *brkchars_fn;
|
||
|
||
if (c->completer_handle_brkchars != NULL)
|
||
brkchars_fn = c->completer_handle_brkchars;
|
||
else
|
||
{
|
||
brkchars_fn
|
||
= (completer_handle_brkchars_func_for_completer
|
||
(c->completer));
|
||
}
|
||
|
||
brkchars_fn (c, tracker, p, word);
|
||
}
|
||
|
||
if (reason != handle_brkchars && c->completer != NULL)
|
||
(*c->completer) (c, tracker, p, word);
|
||
}
|
||
|
||
/* Internal function used to handle completions.
|
||
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at.
|
||
|
||
LINE_BUFFER is available to be looked at; it contains the entire
|
||
text of the line. POINT is the offset in that line of the cursor.
|
||
You should pretend that the line ends at POINT.
|
||
|
||
See complete_line_internal_reason for description of REASON. */
|
||
|
||
static void
|
||
complete_line_internal_1 (completion_tracker &tracker,
|
||
const char *text,
|
||
const char *line_buffer, int point,
|
||
complete_line_internal_reason reason)
|
||
{
|
||
char *tmp_command;
|
||
const char *p;
|
||
int ignore_help_classes;
|
||
/* Pointer within tmp_command which corresponds to text. */
|
||
const char *word;
|
||
struct cmd_list_element *c, *result_list;
|
||
|
||
/* Choose the default set of word break characters to break
|
||
completions. If we later find out that we are doing completions
|
||
on command strings (as opposed to strings supplied by the
|
||
individual command completer functions, which can be any string)
|
||
then we will switch to the special word break set for command
|
||
strings, which leaves out the '-' character used in some
|
||
commands. */
|
||
set_rl_completer_word_break_characters
|
||
(current_language->la_word_break_characters());
|
||
|
||
/* Decide whether to complete on a list of gdb commands or on
|
||
symbols. */
|
||
tmp_command = (char *) alloca (point + 1);
|
||
p = tmp_command;
|
||
|
||
/* The help command should complete help aliases. */
|
||
ignore_help_classes = reason != handle_help;
|
||
|
||
strncpy (tmp_command, line_buffer, point);
|
||
tmp_command[point] = '\0';
|
||
if (reason == handle_brkchars)
|
||
{
|
||
gdb_assert (text == NULL);
|
||
word = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* Since text always contains some number of characters leading up
|
||
to point, we can find the equivalent position in tmp_command
|
||
by subtracting that many characters from the end of tmp_command. */
|
||
word = tmp_command + point - strlen (text);
|
||
}
|
||
|
||
/* Move P up to the start of the command. */
|
||
p = skip_spaces (p);
|
||
|
||
if (*p == '\0')
|
||
{
|
||
/* An empty line is ambiguous; that is, it could be any
|
||
command. */
|
||
c = CMD_LIST_AMBIGUOUS;
|
||
result_list = 0;
|
||
}
|
||
else
|
||
{
|
||
c = lookup_cmd_1 (&p, cmdlist, &result_list, ignore_help_classes);
|
||
}
|
||
|
||
/* Move p up to the next interesting thing. */
|
||
while (*p == ' ' || *p == '\t')
|
||
{
|
||
p++;
|
||
}
|
||
|
||
tracker.advance_custom_word_point_by (p - tmp_command);
|
||
|
||
if (!c)
|
||
{
|
||
/* It is an unrecognized command. So there are no
|
||
possible completions. */
|
||
}
|
||
else if (c == CMD_LIST_AMBIGUOUS)
|
||
{
|
||
const char *q;
|
||
|
||
/* lookup_cmd_1 advances p up to the first ambiguous thing, but
|
||
doesn't advance over that thing itself. Do so now. */
|
||
q = p;
|
||
while (*q && (isalnum (*q) || *q == '-' || *q == '_'))
|
||
++q;
|
||
if (q != tmp_command + point)
|
||
{
|
||
/* There is something beyond the ambiguous
|
||
command, so there are no possible completions. For
|
||
example, "info t " or "info t foo" does not complete
|
||
to anything, because "info t" can be "info target" or
|
||
"info terminal". */
|
||
}
|
||
else
|
||
{
|
||
/* We're trying to complete on the command which was ambiguous.
|
||
This we can deal with. */
|
||
if (result_list)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
complete_on_cmdlist (*result_list->prefixlist, tracker, p,
|
||
word, ignore_help_classes);
|
||
}
|
||
else
|
||
{
|
||
if (reason != handle_brkchars)
|
||
complete_on_cmdlist (cmdlist, tracker, p, word,
|
||
ignore_help_classes);
|
||
}
|
||
/* Ensure that readline does the right thing with respect to
|
||
inserting quotes. */
|
||
set_rl_completer_word_break_characters
|
||
(gdb_completer_command_word_break_characters);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We've recognized a full command. */
|
||
|
||
if (p == tmp_command + point)
|
||
{
|
||
/* There is no non-whitespace in the line beyond the
|
||
command. */
|
||
|
||
if (p[-1] == ' ' || p[-1] == '\t')
|
||
{
|
||
/* The command is followed by whitespace; we need to
|
||
complete on whatever comes after command. */
|
||
if (c->prefixlist)
|
||
{
|
||
/* It is a prefix command; what comes after it is
|
||
a subcommand (e.g. "info "). */
|
||
if (reason != handle_brkchars)
|
||
complete_on_cmdlist (*c->prefixlist, tracker, p, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
set_rl_completer_word_break_characters
|
||
(gdb_completer_command_word_break_characters);
|
||
}
|
||
else if (reason == handle_help)
|
||
;
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
complete_on_enum (tracker, c->enums, p, word);
|
||
set_rl_completer_word_break_characters
|
||
(gdb_completer_command_word_break_characters);
|
||
}
|
||
else
|
||
{
|
||
/* It is a normal command; what comes after it is
|
||
completed by the command's completer function. */
|
||
complete_line_internal_normal_command (tracker,
|
||
tmp_command, word, p,
|
||
reason, c);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* The command is not followed by whitespace; we need to
|
||
complete on the command itself, e.g. "p" which is a
|
||
command itself but also can complete to "print", "ptype"
|
||
etc. */
|
||
const char *q;
|
||
|
||
/* Find the command we are completing on. */
|
||
q = p;
|
||
while (q > tmp_command)
|
||
{
|
||
if (isalnum (q[-1]) || q[-1] == '-' || q[-1] == '_')
|
||
--q;
|
||
else
|
||
break;
|
||
}
|
||
|
||
/* Move the custom word point back too. */
|
||
tracker.advance_custom_word_point_by (q - p);
|
||
|
||
if (reason != handle_brkchars)
|
||
complete_on_cmdlist (result_list, tracker, q, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
set_rl_completer_word_break_characters
|
||
(gdb_completer_command_word_break_characters);
|
||
}
|
||
}
|
||
else if (reason == handle_help)
|
||
;
|
||
else
|
||
{
|
||
/* There is non-whitespace beyond the command. */
|
||
|
||
if (c->prefixlist && !c->allow_unknown)
|
||
{
|
||
/* It is an unrecognized subcommand of a prefix command,
|
||
e.g. "info adsfkdj". */
|
||
}
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
complete_on_enum (tracker, c->enums, p, word);
|
||
}
|
||
else
|
||
{
|
||
/* It is a normal command. */
|
||
complete_line_internal_normal_command (tracker,
|
||
tmp_command, word, p,
|
||
reason, c);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Wrapper around complete_line_internal_1 to handle
|
||
MAX_COMPLETIONS_REACHED_ERROR. */
|
||
|
||
static void
|
||
complete_line_internal (completion_tracker &tracker,
|
||
const char *text,
|
||
const char *line_buffer, int point,
|
||
complete_line_internal_reason reason)
|
||
{
|
||
try
|
||
{
|
||
complete_line_internal_1 (tracker, text, line_buffer, point, reason);
|
||
}
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
if (except.error != MAX_COMPLETIONS_REACHED_ERROR)
|
||
throw;
|
||
}
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
int max_completions = 200;
|
||
|
||
/* Initial size of the table. It automagically grows from here. */
|
||
#define INITIAL_COMPLETION_HTAB_SIZE 200
|
||
|
||
/* See completer.h. */
|
||
|
||
completion_tracker::completion_tracker ()
|
||
{
|
||
m_entries_hash = htab_create_alloc (INITIAL_COMPLETION_HTAB_SIZE,
|
||
htab_hash_string, streq_hash,
|
||
NULL, xcalloc, xfree);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
completion_tracker::discard_completions ()
|
||
{
|
||
xfree (m_lowest_common_denominator);
|
||
m_lowest_common_denominator = NULL;
|
||
|
||
m_lowest_common_denominator_unique = false;
|
||
|
||
m_entries_vec.clear ();
|
||
|
||
htab_delete (m_entries_hash);
|
||
m_entries_hash = htab_create_alloc (INITIAL_COMPLETION_HTAB_SIZE,
|
||
htab_hash_string, streq_hash,
|
||
NULL, xcalloc, xfree);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
completion_tracker::~completion_tracker ()
|
||
{
|
||
xfree (m_lowest_common_denominator);
|
||
htab_delete (m_entries_hash);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
bool
|
||
completion_tracker::maybe_add_completion
|
||
(gdb::unique_xmalloc_ptr<char> name,
|
||
completion_match_for_lcd *match_for_lcd,
|
||
const char *text, const char *word)
|
||
{
|
||
void **slot;
|
||
|
||
if (max_completions == 0)
|
||
return false;
|
||
|
||
if (htab_elements (m_entries_hash) >= max_completions)
|
||
return false;
|
||
|
||
slot = htab_find_slot (m_entries_hash, name.get (), INSERT);
|
||
if (*slot == HTAB_EMPTY_ENTRY)
|
||
{
|
||
const char *match_for_lcd_str = NULL;
|
||
|
||
if (match_for_lcd != NULL)
|
||
match_for_lcd_str = match_for_lcd->finish ();
|
||
|
||
if (match_for_lcd_str == NULL)
|
||
match_for_lcd_str = name.get ();
|
||
|
||
gdb::unique_xmalloc_ptr<char> lcd
|
||
= make_completion_match_str (match_for_lcd_str, text, word);
|
||
|
||
recompute_lowest_common_denominator (std::move (lcd));
|
||
|
||
*slot = name.get ();
|
||
m_entries_vec.push_back (std::move (name));
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
completion_tracker::add_completion (gdb::unique_xmalloc_ptr<char> name,
|
||
completion_match_for_lcd *match_for_lcd,
|
||
const char *text, const char *word)
|
||
{
|
||
if (!maybe_add_completion (std::move (name), match_for_lcd, text, word))
|
||
throw_error (MAX_COMPLETIONS_REACHED_ERROR, _("Max completions reached."));
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
completion_tracker::add_completions (completion_list &&list)
|
||
{
|
||
for (auto &candidate : list)
|
||
add_completion (std::move (candidate));
|
||
}
|
||
|
||
/* Helper for the make_completion_match_str overloads. Returns NULL
|
||
as an indication that we want MATCH_NAME exactly. It is up to the
|
||
caller to xstrdup that string if desired. */
|
||
|
||
static char *
|
||
make_completion_match_str_1 (const char *match_name,
|
||
const char *text, const char *word)
|
||
{
|
||
char *newobj;
|
||
|
||
if (word == text)
|
||
{
|
||
/* Return NULL as an indication that we want MATCH_NAME
|
||
exactly. */
|
||
return NULL;
|
||
}
|
||
else if (word > text)
|
||
{
|
||
/* Return some portion of MATCH_NAME. */
|
||
newobj = xstrdup (match_name + (word - text));
|
||
}
|
||
else
|
||
{
|
||
/* Return some of WORD plus MATCH_NAME. */
|
||
size_t len = strlen (match_name);
|
||
newobj = (char *) xmalloc (text - word + len + 1);
|
||
memcpy (newobj, word, text - word);
|
||
memcpy (newobj + (text - word), match_name, len + 1);
|
||
}
|
||
|
||
return newobj;
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
gdb::unique_xmalloc_ptr<char>
|
||
make_completion_match_str (const char *match_name,
|
||
const char *text, const char *word)
|
||
{
|
||
char *newobj = make_completion_match_str_1 (match_name, text, word);
|
||
if (newobj == NULL)
|
||
newobj = xstrdup (match_name);
|
||
return gdb::unique_xmalloc_ptr<char> (newobj);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
gdb::unique_xmalloc_ptr<char>
|
||
make_completion_match_str (gdb::unique_xmalloc_ptr<char> &&match_name,
|
||
const char *text, const char *word)
|
||
{
|
||
char *newobj = make_completion_match_str_1 (match_name.get (), text, word);
|
||
if (newobj == NULL)
|
||
return std::move (match_name);
|
||
return gdb::unique_xmalloc_ptr<char> (newobj);
|
||
}
|
||
|
||
/* See complete.h. */
|
||
|
||
completion_result
|
||
complete (const char *line, char const **word, int *quote_char)
|
||
{
|
||
completion_tracker tracker_handle_brkchars;
|
||
completion_tracker tracker_handle_completions;
|
||
completion_tracker *tracker;
|
||
|
||
/* The WORD should be set to the end of word to complete. We initialize
|
||
to the completion point which is assumed to be at the end of LINE.
|
||
This leaves WORD to be initialized to a sensible value in cases
|
||
completion_find_completion_word() fails i.e., throws an exception.
|
||
See bug 24587. */
|
||
*word = line + strlen (line);
|
||
|
||
try
|
||
{
|
||
*word = completion_find_completion_word (tracker_handle_brkchars,
|
||
line, quote_char);
|
||
|
||
/* Completers that provide a custom word point in the
|
||
handle_brkchars phase also compute their completions then.
|
||
Completers that leave the completion word handling to readline
|
||
must be called twice. */
|
||
if (tracker_handle_brkchars.use_custom_word_point ())
|
||
tracker = &tracker_handle_brkchars;
|
||
else
|
||
{
|
||
complete_line (tracker_handle_completions, *word, line, strlen (line));
|
||
tracker = &tracker_handle_completions;
|
||
}
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
return {};
|
||
}
|
||
|
||
return tracker->build_completion_result (*word, *word - line, strlen (line));
|
||
}
|
||
|
||
|
||
/* Generate completions all at once. Does nothing if max_completions
|
||
is 0. If max_completions is non-negative, this will collect at
|
||
most max_completions strings.
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at.
|
||
|
||
LINE_BUFFER is available to be looked at; it contains the entire
|
||
text of the line.
|
||
|
||
POINT is the offset in that line of the cursor. You
|
||
should pretend that the line ends at POINT. */
|
||
|
||
void
|
||
complete_line (completion_tracker &tracker,
|
||
const char *text, const char *line_buffer, int point)
|
||
{
|
||
if (max_completions == 0)
|
||
return;
|
||
complete_line_internal (tracker, text, line_buffer, point,
|
||
handle_completions);
|
||
}
|
||
|
||
/* Complete on command names. Used by "help". */
|
||
|
||
void
|
||
command_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
complete_line_internal (tracker, word, text,
|
||
strlen (text), handle_help);
|
||
}
|
||
|
||
/* The corresponding completer_handle_brkchars implementation. */
|
||
|
||
static void
|
||
command_completer_handle_brkchars (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
set_rl_completer_word_break_characters
|
||
(gdb_completer_command_word_break_characters);
|
||
}
|
||
|
||
/* Complete on signals. */
|
||
|
||
void
|
||
signal_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
size_t len = strlen (word);
|
||
int signum;
|
||
const char *signame;
|
||
|
||
for (signum = GDB_SIGNAL_FIRST; signum != GDB_SIGNAL_LAST; ++signum)
|
||
{
|
||
/* Can't handle this, so skip it. */
|
||
if (signum == GDB_SIGNAL_0)
|
||
continue;
|
||
|
||
signame = gdb_signal_to_name ((enum gdb_signal) signum);
|
||
|
||
/* Ignore the unknown signal case. */
|
||
if (!signame || strcmp (signame, "?") == 0)
|
||
continue;
|
||
|
||
if (strncasecmp (signame, word, len) == 0)
|
||
tracker.add_completion (make_unique_xstrdup (signame));
|
||
}
|
||
}
|
||
|
||
/* Bit-flags for selecting what the register and/or register-group
|
||
completer should complete on. */
|
||
|
||
enum reg_completer_target
|
||
{
|
||
complete_register_names = 0x1,
|
||
complete_reggroup_names = 0x2
|
||
};
|
||
DEF_ENUM_FLAGS_TYPE (enum reg_completer_target, reg_completer_targets);
|
||
|
||
/* Complete register names and/or reggroup names based on the value passed
|
||
in TARGETS. At least one bit in TARGETS must be set. */
|
||
|
||
static void
|
||
reg_or_group_completer_1 (completion_tracker &tracker,
|
||
const char *text, const char *word,
|
||
reg_completer_targets targets)
|
||
{
|
||
size_t len = strlen (word);
|
||
struct gdbarch *gdbarch;
|
||
const char *name;
|
||
|
||
gdb_assert ((targets & (complete_register_names
|
||
| complete_reggroup_names)) != 0);
|
||
gdbarch = get_current_arch ();
|
||
|
||
if ((targets & complete_register_names) != 0)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0;
|
||
(name = user_reg_map_regnum_to_name (gdbarch, i)) != NULL;
|
||
i++)
|
||
{
|
||
if (*name != '\0' && strncmp (word, name, len) == 0)
|
||
tracker.add_completion (make_unique_xstrdup (name));
|
||
}
|
||
}
|
||
|
||
if ((targets & complete_reggroup_names) != 0)
|
||
{
|
||
struct reggroup *group;
|
||
|
||
for (group = reggroup_next (gdbarch, NULL);
|
||
group != NULL;
|
||
group = reggroup_next (gdbarch, group))
|
||
{
|
||
name = reggroup_name (group);
|
||
if (strncmp (word, name, len) == 0)
|
||
tracker.add_completion (make_unique_xstrdup (name));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Perform completion on register and reggroup names. */
|
||
|
||
void
|
||
reg_or_group_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
reg_or_group_completer_1 (tracker, text, word,
|
||
(complete_register_names
|
||
| complete_reggroup_names));
|
||
}
|
||
|
||
/* Perform completion on reggroup names. */
|
||
|
||
void
|
||
reggroup_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
reg_or_group_completer_1 (tracker, text, word,
|
||
complete_reggroup_names);
|
||
}
|
||
|
||
/* The default completer_handle_brkchars implementation. */
|
||
|
||
static void
|
||
default_completer_handle_brkchars (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
set_rl_completer_word_break_characters
|
||
(current_language->la_word_break_characters ());
|
||
}
|
||
|
||
/* See definition in completer.h. */
|
||
|
||
completer_handle_brkchars_ftype *
|
||
completer_handle_brkchars_func_for_completer (completer_ftype *fn)
|
||
{
|
||
if (fn == filename_completer)
|
||
return filename_completer_handle_brkchars;
|
||
|
||
if (fn == location_completer)
|
||
return location_completer_handle_brkchars;
|
||
|
||
if (fn == command_completer)
|
||
return command_completer_handle_brkchars;
|
||
|
||
return default_completer_handle_brkchars;
|
||
}
|
||
|
||
/* Used as brkchars when we want to tell readline we have a custom
|
||
word point. We do that by making our rl_completion_word_break_hook
|
||
set RL_POINT to the desired word point, and return the character at
|
||
the word break point as the break char. This is two bytes in order
|
||
to fit one break character plus the terminating null. */
|
||
static char gdb_custom_word_point_brkchars[2];
|
||
|
||
/* Since rl_basic_quote_characters is not completer-specific, we save
|
||
its original value here, in order to be able to restore it in
|
||
gdb_rl_attempted_completion_function. */
|
||
static const char *gdb_org_rl_basic_quote_characters = rl_basic_quote_characters;
|
||
|
||
/* Get the list of chars that are considered as word breaks
|
||
for the current command. */
|
||
|
||
static char *
|
||
gdb_completion_word_break_characters_throw ()
|
||
{
|
||
/* New completion starting. Get rid of the previous tracker and
|
||
start afresh. */
|
||
delete current_completion.tracker;
|
||
current_completion.tracker = new completion_tracker ();
|
||
|
||
completion_tracker &tracker = *current_completion.tracker;
|
||
|
||
complete_line_internal (tracker, NULL, rl_line_buffer,
|
||
rl_point, handle_brkchars);
|
||
|
||
if (tracker.use_custom_word_point ())
|
||
{
|
||
gdb_assert (tracker.custom_word_point () > 0);
|
||
rl_point = tracker.custom_word_point () - 1;
|
||
gdb_custom_word_point_brkchars[0] = rl_line_buffer[rl_point];
|
||
rl_completer_word_break_characters = gdb_custom_word_point_brkchars;
|
||
rl_completer_quote_characters = NULL;
|
||
|
||
/* Clear this too, so that if we're completing a quoted string,
|
||
readline doesn't consider the quote character a delimiter.
|
||
If we didn't do this, readline would auto-complete {b
|
||
'fun<tab>} to {'b 'function()'}, i.e., add the terminating
|
||
\', but, it wouldn't append the separator space either, which
|
||
is not desirable. So instead we take care of appending the
|
||
quote character to the LCD ourselves, in
|
||
gdb_rl_attempted_completion_function. Since this global is
|
||
not just completer-specific, we'll restore it back to the
|
||
default in gdb_rl_attempted_completion_function. */
|
||
rl_basic_quote_characters = NULL;
|
||
}
|
||
|
||
return rl_completer_word_break_characters;
|
||
}
|
||
|
||
char *
|
||
gdb_completion_word_break_characters ()
|
||
{
|
||
/* New completion starting. */
|
||
current_completion.aborted = false;
|
||
|
||
try
|
||
{
|
||
return gdb_completion_word_break_characters_throw ();
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
/* Set this to that gdb_rl_attempted_completion_function knows
|
||
to abort early. */
|
||
current_completion.aborted = true;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
const char *
|
||
completion_find_completion_word (completion_tracker &tracker, const char *text,
|
||
int *quote_char)
|
||
{
|
||
size_t point = strlen (text);
|
||
|
||
complete_line_internal (tracker, NULL, text, point, handle_brkchars);
|
||
|
||
if (tracker.use_custom_word_point ())
|
||
{
|
||
gdb_assert (tracker.custom_word_point () > 0);
|
||
*quote_char = tracker.quote_char ();
|
||
return text + tracker.custom_word_point ();
|
||
}
|
||
|
||
gdb_rl_completion_word_info info;
|
||
|
||
info.word_break_characters = rl_completer_word_break_characters;
|
||
info.quote_characters = gdb_completer_quote_characters;
|
||
info.basic_quote_characters = rl_basic_quote_characters;
|
||
|
||
return gdb_rl_find_completion_word (&info, quote_char, NULL, text);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
completion_tracker::recompute_lowest_common_denominator
|
||
(gdb::unique_xmalloc_ptr<char> &&new_match_up)
|
||
{
|
||
if (m_lowest_common_denominator == NULL)
|
||
{
|
||
/* We don't have a lowest common denominator yet, so simply take
|
||
the whole NEW_MATCH_UP as being it. */
|
||
m_lowest_common_denominator = new_match_up.release ();
|
||
m_lowest_common_denominator_unique = true;
|
||
}
|
||
else
|
||
{
|
||
/* Find the common denominator between the currently-known
|
||
lowest common denominator and NEW_MATCH_UP. That becomes the
|
||
new lowest common denominator. */
|
||
size_t i;
|
||
const char *new_match = new_match_up.get ();
|
||
|
||
for (i = 0;
|
||
(new_match[i] != '\0'
|
||
&& new_match[i] == m_lowest_common_denominator[i]);
|
||
i++)
|
||
;
|
||
if (m_lowest_common_denominator[i] != new_match[i])
|
||
{
|
||
m_lowest_common_denominator[i] = '\0';
|
||
m_lowest_common_denominator_unique = false;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
void
|
||
completion_tracker::advance_custom_word_point_by (int len)
|
||
{
|
||
m_custom_word_point += len;
|
||
}
|
||
|
||
/* Build a new C string that is a copy of LCD with the whitespace of
|
||
ORIG/ORIG_LEN preserved.
|
||
|
||
Say the user is completing a symbol name, with spaces, like:
|
||
|
||
"foo ( i"
|
||
|
||
and the resulting completion match is:
|
||
|
||
"foo(int)"
|
||
|
||
we want to end up with an input line like:
|
||
|
||
"foo ( int)"
|
||
^^^^^^^ => text from LCD [1], whitespace from ORIG preserved.
|
||
^^ => new text from LCD
|
||
|
||
[1] - We must take characters from the LCD instead of the original
|
||
text, since some completions want to change upper/lowercase. E.g.:
|
||
|
||
"handle sig<>"
|
||
|
||
completes to:
|
||
|
||
"handle SIG[QUIT|etc.]"
|
||
*/
|
||
|
||
static char *
|
||
expand_preserving_ws (const char *orig, size_t orig_len,
|
||
const char *lcd)
|
||
{
|
||
const char *p_orig = orig;
|
||
const char *orig_end = orig + orig_len;
|
||
const char *p_lcd = lcd;
|
||
std::string res;
|
||
|
||
while (p_orig < orig_end)
|
||
{
|
||
if (*p_orig == ' ')
|
||
{
|
||
while (p_orig < orig_end && *p_orig == ' ')
|
||
res += *p_orig++;
|
||
p_lcd = skip_spaces (p_lcd);
|
||
}
|
||
else
|
||
{
|
||
/* Take characters from the LCD instead of the original
|
||
text, since some completions change upper/lowercase.
|
||
E.g.:
|
||
"handle sig<>"
|
||
completes to:
|
||
"handle SIG[QUIT|etc.]"
|
||
*/
|
||
res += *p_lcd;
|
||
p_orig++;
|
||
p_lcd++;
|
||
}
|
||
}
|
||
|
||
while (*p_lcd != '\0')
|
||
res += *p_lcd++;
|
||
|
||
return xstrdup (res.c_str ());
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
completion_result
|
||
completion_tracker::build_completion_result (const char *text,
|
||
int start, int end)
|
||
{
|
||
completion_list &list = m_entries_vec; /* The completions. */
|
||
|
||
if (list.empty ())
|
||
return {};
|
||
|
||
/* +1 for the LCD, and +1 for NULL termination. */
|
||
char **match_list = XNEWVEC (char *, 1 + list.size () + 1);
|
||
|
||
/* Build replacement word, based on the LCD. */
|
||
|
||
match_list[0]
|
||
= expand_preserving_ws (text, end - start,
|
||
m_lowest_common_denominator);
|
||
|
||
if (m_lowest_common_denominator_unique)
|
||
{
|
||
/* We don't rely on readline appending the quote char as
|
||
delimiter as then readline wouldn't append the ' ' after the
|
||
completion. */
|
||
char buf[2] = { (char) quote_char () };
|
||
|
||
match_list[0] = reconcat (match_list[0], match_list[0],
|
||
buf, (char *) NULL);
|
||
match_list[1] = NULL;
|
||
|
||
/* If the tracker wants to, or we already have a space at the
|
||
end of the match, tell readline to skip appending
|
||
another. */
|
||
bool completion_suppress_append
|
||
= (suppress_append_ws ()
|
||
|| match_list[0][strlen (match_list[0]) - 1] == ' ');
|
||
|
||
return completion_result (match_list, 1, completion_suppress_append);
|
||
}
|
||
else
|
||
{
|
||
int ix;
|
||
|
||
for (ix = 0; ix < list.size (); ++ix)
|
||
match_list[ix + 1] = list[ix].release ();
|
||
match_list[ix + 1] = NULL;
|
||
|
||
return completion_result (match_list, list.size (), false);
|
||
}
|
||
}
|
||
|
||
/* See completer.h */
|
||
|
||
completion_result::completion_result ()
|
||
: match_list (NULL), number_matches (0),
|
||
completion_suppress_append (false)
|
||
{}
|
||
|
||
/* See completer.h */
|
||
|
||
completion_result::completion_result (char **match_list_,
|
||
size_t number_matches_,
|
||
bool completion_suppress_append_)
|
||
: match_list (match_list_),
|
||
number_matches (number_matches_),
|
||
completion_suppress_append (completion_suppress_append_)
|
||
{}
|
||
|
||
/* See completer.h */
|
||
|
||
completion_result::~completion_result ()
|
||
{
|
||
reset_match_list ();
|
||
}
|
||
|
||
/* See completer.h */
|
||
|
||
completion_result::completion_result (completion_result &&rhs)
|
||
{
|
||
if (this == &rhs)
|
||
return;
|
||
|
||
reset_match_list ();
|
||
match_list = rhs.match_list;
|
||
rhs.match_list = NULL;
|
||
number_matches = rhs.number_matches;
|
||
rhs.number_matches = 0;
|
||
}
|
||
|
||
/* See completer.h */
|
||
|
||
char **
|
||
completion_result::release_match_list ()
|
||
{
|
||
char **ret = match_list;
|
||
match_list = NULL;
|
||
return ret;
|
||
}
|
||
|
||
/* See completer.h */
|
||
|
||
void
|
||
completion_result::sort_match_list ()
|
||
{
|
||
if (number_matches > 1)
|
||
{
|
||
/* Element 0 is special (it's the common prefix), leave it
|
||
be. */
|
||
std::sort (&match_list[1],
|
||
&match_list[number_matches + 1],
|
||
compare_cstrings);
|
||
}
|
||
}
|
||
|
||
/* See completer.h */
|
||
|
||
void
|
||
completion_result::reset_match_list ()
|
||
{
|
||
if (match_list != NULL)
|
||
{
|
||
for (char **p = match_list; *p != NULL; p++)
|
||
xfree (*p);
|
||
xfree (match_list);
|
||
match_list = NULL;
|
||
}
|
||
}
|
||
|
||
/* Helper for gdb_rl_attempted_completion_function, which does most of
|
||
the work. This is called by readline to build the match list array
|
||
and to determine the lowest common denominator. The real matches
|
||
list starts at match[1], while match[0] is the slot holding
|
||
readline's idea of the lowest common denominator of all matches,
|
||
which is what readline replaces the completion "word" with.
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at, as
|
||
computed in the handle_brkchars phase.
|
||
|
||
START is the offset from RL_LINE_BUFFER where TEXT starts. END is
|
||
the offset from RL_LINE_BUFFER where TEXT ends (i.e., where
|
||
rl_point is).
|
||
|
||
You should thus pretend that the line ends at END (relative to
|
||
RL_LINE_BUFFER).
|
||
|
||
RL_LINE_BUFFER contains the entire text of the line. RL_POINT is
|
||
the offset in that line of the cursor. You should pretend that the
|
||
line ends at POINT.
|
||
|
||
Returns NULL if there are no completions. */
|
||
|
||
static char **
|
||
gdb_rl_attempted_completion_function_throw (const char *text, int start, int end)
|
||
{
|
||
/* Completers that provide a custom word point in the
|
||
handle_brkchars phase also compute their completions then.
|
||
Completers that leave the completion word handling to readline
|
||
must be called twice. If rl_point (i.e., END) is at column 0,
|
||
then readline skips the handle_brkchars phase, and so we create a
|
||
tracker now in that case too. */
|
||
if (end == 0 || !current_completion.tracker->use_custom_word_point ())
|
||
{
|
||
delete current_completion.tracker;
|
||
current_completion.tracker = new completion_tracker ();
|
||
|
||
complete_line (*current_completion.tracker, text,
|
||
rl_line_buffer, rl_point);
|
||
}
|
||
|
||
completion_tracker &tracker = *current_completion.tracker;
|
||
|
||
completion_result result
|
||
= tracker.build_completion_result (text, start, end);
|
||
|
||
rl_completion_suppress_append = result.completion_suppress_append;
|
||
return result.release_match_list ();
|
||
}
|
||
|
||
/* Function installed as "rl_attempted_completion_function" readline
|
||
hook. Wrapper around gdb_rl_attempted_completion_function_throw
|
||
that catches C++ exceptions, which can't cross readline. */
|
||
|
||
char **
|
||
gdb_rl_attempted_completion_function (const char *text, int start, int end)
|
||
{
|
||
/* Restore globals that might have been tweaked in
|
||
gdb_completion_word_break_characters. */
|
||
rl_basic_quote_characters = gdb_org_rl_basic_quote_characters;
|
||
|
||
/* If we end up returning NULL, either on error, or simple because
|
||
there are no matches, inhibit readline's default filename
|
||
completer. */
|
||
rl_attempted_completion_over = 1;
|
||
|
||
/* If the handle_brkchars phase was aborted, don't try
|
||
completing. */
|
||
if (current_completion.aborted)
|
||
return NULL;
|
||
|
||
try
|
||
{
|
||
return gdb_rl_attempted_completion_function_throw (text, start, end);
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Skip over the possibly quoted word STR (as defined by the quote
|
||
characters QUOTECHARS and the word break characters BREAKCHARS).
|
||
Returns pointer to the location after the "word". If either
|
||
QUOTECHARS or BREAKCHARS is NULL, use the same values used by the
|
||
completer. */
|
||
|
||
const char *
|
||
skip_quoted_chars (const char *str, const char *quotechars,
|
||
const char *breakchars)
|
||
{
|
||
char quote_char = '\0';
|
||
const char *scan;
|
||
|
||
if (quotechars == NULL)
|
||
quotechars = gdb_completer_quote_characters;
|
||
|
||
if (breakchars == NULL)
|
||
breakchars = current_language->la_word_break_characters();
|
||
|
||
for (scan = str; *scan != '\0'; scan++)
|
||
{
|
||
if (quote_char != '\0')
|
||
{
|
||
/* Ignore everything until the matching close quote char. */
|
||
if (*scan == quote_char)
|
||
{
|
||
/* Found matching close quote. */
|
||
scan++;
|
||
break;
|
||
}
|
||
}
|
||
else if (strchr (quotechars, *scan))
|
||
{
|
||
/* Found start of a quoted string. */
|
||
quote_char = *scan;
|
||
}
|
||
else if (strchr (breakchars, *scan))
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
|
||
return (scan);
|
||
}
|
||
|
||
/* Skip over the possibly quoted word STR (as defined by the quote
|
||
characters and word break characters used by the completer).
|
||
Returns pointer to the location after the "word". */
|
||
|
||
const char *
|
||
skip_quoted (const char *str)
|
||
{
|
||
return skip_quoted_chars (str, NULL, NULL);
|
||
}
|
||
|
||
/* Return a message indicating that the maximum number of completions
|
||
has been reached and that there may be more. */
|
||
|
||
const char *
|
||
get_max_completions_reached_message (void)
|
||
{
|
||
return _("*** List may be truncated, max-completions reached. ***");
|
||
}
|
||
|
||
/* GDB replacement for rl_display_match_list.
|
||
Readline doesn't provide a clean interface for TUI(curses).
|
||
A hack previously used was to send readline's rl_outstream through a pipe
|
||
and read it from the event loop. Bleah. IWBN if readline abstracted
|
||
away all the necessary bits, and this is what this code does. It
|
||
replicates the parts of readline we need and then adds an abstraction
|
||
layer, currently implemented as struct match_list_displayer, so that both
|
||
CLI and TUI can use it. We copy all this readline code to minimize
|
||
GDB-specific mods to readline. Once this code performs as desired then
|
||
we can submit it to the readline maintainers.
|
||
|
||
N.B. A lot of the code is the way it is in order to minimize differences
|
||
from readline's copy. */
|
||
|
||
/* Not supported here. */
|
||
#undef VISIBLE_STATS
|
||
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
#define MB_INVALIDCH(x) ((x) == (size_t)-1 || (x) == (size_t)-2)
|
||
#define MB_NULLWCH(x) ((x) == 0)
|
||
#endif
|
||
|
||
#define ELLIPSIS_LEN 3
|
||
|
||
/* gdb version of readline/complete.c:get_y_or_n.
|
||
'y' -> returns 1, and 'n' -> returns 0.
|
||
Also supported: space == 'y', RUBOUT == 'n', ctrl-g == start over.
|
||
If FOR_PAGER is non-zero, then also supported are:
|
||
NEWLINE or RETURN -> returns 2, and 'q' -> returns 0. */
|
||
|
||
static int
|
||
gdb_get_y_or_n (int for_pager, const struct match_list_displayer *displayer)
|
||
{
|
||
int c;
|
||
|
||
for (;;)
|
||
{
|
||
RL_SETSTATE (RL_STATE_MOREINPUT);
|
||
c = displayer->read_key (displayer);
|
||
RL_UNSETSTATE (RL_STATE_MOREINPUT);
|
||
|
||
if (c == 'y' || c == 'Y' || c == ' ')
|
||
return 1;
|
||
if (c == 'n' || c == 'N' || c == RUBOUT)
|
||
return 0;
|
||
if (c == ABORT_CHAR || c < 0)
|
||
{
|
||
/* Readline doesn't erase_entire_line here, but without it the
|
||
--More-- prompt isn't erased and neither is the text entered
|
||
thus far redisplayed. */
|
||
displayer->erase_entire_line (displayer);
|
||
/* Note: The arguments to rl_abort are ignored. */
|
||
rl_abort (0, 0);
|
||
}
|
||
if (for_pager && (c == NEWLINE || c == RETURN))
|
||
return 2;
|
||
if (for_pager && (c == 'q' || c == 'Q'))
|
||
return 0;
|
||
displayer->beep (displayer);
|
||
}
|
||
}
|
||
|
||
/* Pager function for tab-completion.
|
||
This is based on readline/complete.c:_rl_internal_pager.
|
||
LINES is the number of lines of output displayed thus far.
|
||
Returns:
|
||
-1 -> user pressed 'n' or equivalent,
|
||
0 -> user pressed 'y' or equivalent,
|
||
N -> user pressed NEWLINE or equivalent and N is LINES - 1. */
|
||
|
||
static int
|
||
gdb_display_match_list_pager (int lines,
|
||
const struct match_list_displayer *displayer)
|
||
{
|
||
int i;
|
||
|
||
displayer->puts (displayer, "--More--");
|
||
displayer->flush (displayer);
|
||
i = gdb_get_y_or_n (1, displayer);
|
||
displayer->erase_entire_line (displayer);
|
||
if (i == 0)
|
||
return -1;
|
||
else if (i == 2)
|
||
return (lines - 1);
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
/* Return non-zero if FILENAME is a directory.
|
||
Based on readline/complete.c:path_isdir. */
|
||
|
||
static int
|
||
gdb_path_isdir (const char *filename)
|
||
{
|
||
struct stat finfo;
|
||
|
||
return (stat (filename, &finfo) == 0 && S_ISDIR (finfo.st_mode));
|
||
}
|
||
|
||
/* Return the portion of PATHNAME that should be output when listing
|
||
possible completions. If we are hacking filename completion, we
|
||
are only interested in the basename, the portion following the
|
||
final slash. Otherwise, we return what we were passed. Since
|
||
printing empty strings is not very informative, if we're doing
|
||
filename completion, and the basename is the empty string, we look
|
||
for the previous slash and return the portion following that. If
|
||
there's no previous slash, we just return what we were passed.
|
||
|
||
Based on readline/complete.c:printable_part. */
|
||
|
||
static char *
|
||
gdb_printable_part (char *pathname)
|
||
{
|
||
char *temp, *x;
|
||
|
||
if (rl_filename_completion_desired == 0) /* don't need to do anything */
|
||
return (pathname);
|
||
|
||
temp = strrchr (pathname, '/');
|
||
#if defined (__MSDOS__)
|
||
if (temp == 0 && ISALPHA ((unsigned char)pathname[0]) && pathname[1] == ':')
|
||
temp = pathname + 1;
|
||
#endif
|
||
|
||
if (temp == 0 || *temp == '\0')
|
||
return (pathname);
|
||
/* If the basename is NULL, we might have a pathname like '/usr/src/'.
|
||
Look for a previous slash and, if one is found, return the portion
|
||
following that slash. If there's no previous slash, just return the
|
||
pathname we were passed. */
|
||
else if (temp[1] == '\0')
|
||
{
|
||
for (x = temp - 1; x > pathname; x--)
|
||
if (*x == '/')
|
||
break;
|
||
return ((*x == '/') ? x + 1 : pathname);
|
||
}
|
||
else
|
||
return ++temp;
|
||
}
|
||
|
||
/* Compute width of STRING when displayed on screen by print_filename.
|
||
Based on readline/complete.c:fnwidth. */
|
||
|
||
static int
|
||
gdb_fnwidth (const char *string)
|
||
{
|
||
int width, pos;
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
mbstate_t ps;
|
||
int left, w;
|
||
size_t clen;
|
||
wchar_t wc;
|
||
|
||
left = strlen (string) + 1;
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
#endif
|
||
|
||
width = pos = 0;
|
||
while (string[pos])
|
||
{
|
||
if (CTRL_CHAR (string[pos]) || string[pos] == RUBOUT)
|
||
{
|
||
width += 2;
|
||
pos++;
|
||
}
|
||
else
|
||
{
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
clen = mbrtowc (&wc, string + pos, left - pos, &ps);
|
||
if (MB_INVALIDCH (clen))
|
||
{
|
||
width++;
|
||
pos++;
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
}
|
||
else if (MB_NULLWCH (clen))
|
||
break;
|
||
else
|
||
{
|
||
pos += clen;
|
||
w = wcwidth (wc);
|
||
width += (w >= 0) ? w : 1;
|
||
}
|
||
#else
|
||
width++;
|
||
pos++;
|
||
#endif
|
||
}
|
||
}
|
||
|
||
return width;
|
||
}
|
||
|
||
/* Print TO_PRINT, one matching completion.
|
||
PREFIX_BYTES is number of common prefix bytes.
|
||
Based on readline/complete.c:fnprint. */
|
||
|
||
static int
|
||
gdb_fnprint (const char *to_print, int prefix_bytes,
|
||
const struct match_list_displayer *displayer)
|
||
{
|
||
int printed_len, w;
|
||
const char *s;
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
mbstate_t ps;
|
||
const char *end;
|
||
size_t tlen;
|
||
int width;
|
||
wchar_t wc;
|
||
|
||
end = to_print + strlen (to_print) + 1;
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
#endif
|
||
|
||
printed_len = 0;
|
||
|
||
/* Don't print only the ellipsis if the common prefix is one of the
|
||
possible completions */
|
||
if (to_print[prefix_bytes] == '\0')
|
||
prefix_bytes = 0;
|
||
|
||
if (prefix_bytes)
|
||
{
|
||
char ellipsis;
|
||
|
||
ellipsis = (to_print[prefix_bytes] == '.') ? '_' : '.';
|
||
for (w = 0; w < ELLIPSIS_LEN; w++)
|
||
displayer->putch (displayer, ellipsis);
|
||
printed_len = ELLIPSIS_LEN;
|
||
}
|
||
|
||
s = to_print + prefix_bytes;
|
||
while (*s)
|
||
{
|
||
if (CTRL_CHAR (*s))
|
||
{
|
||
displayer->putch (displayer, '^');
|
||
displayer->putch (displayer, UNCTRL (*s));
|
||
printed_len += 2;
|
||
s++;
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
#endif
|
||
}
|
||
else if (*s == RUBOUT)
|
||
{
|
||
displayer->putch (displayer, '^');
|
||
displayer->putch (displayer, '?');
|
||
printed_len += 2;
|
||
s++;
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
#if defined (HANDLE_MULTIBYTE)
|
||
tlen = mbrtowc (&wc, s, end - s, &ps);
|
||
if (MB_INVALIDCH (tlen))
|
||
{
|
||
tlen = 1;
|
||
width = 1;
|
||
memset (&ps, 0, sizeof (mbstate_t));
|
||
}
|
||
else if (MB_NULLWCH (tlen))
|
||
break;
|
||
else
|
||
{
|
||
w = wcwidth (wc);
|
||
width = (w >= 0) ? w : 1;
|
||
}
|
||
for (w = 0; w < tlen; ++w)
|
||
displayer->putch (displayer, s[w]);
|
||
s += tlen;
|
||
printed_len += width;
|
||
#else
|
||
displayer->putch (displayer, *s);
|
||
s++;
|
||
printed_len++;
|
||
#endif
|
||
}
|
||
}
|
||
|
||
return printed_len;
|
||
}
|
||
|
||
/* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and we
|
||
are using it, check for and output a single character for `special'
|
||
filenames. Return the number of characters we output.
|
||
Based on readline/complete.c:print_filename. */
|
||
|
||
static int
|
||
gdb_print_filename (char *to_print, char *full_pathname, int prefix_bytes,
|
||
const struct match_list_displayer *displayer)
|
||
{
|
||
int printed_len, extension_char, slen, tlen;
|
||
char *s, c, *new_full_pathname;
|
||
const char *dn;
|
||
extern int _rl_complete_mark_directories;
|
||
|
||
extension_char = 0;
|
||
printed_len = gdb_fnprint (to_print, prefix_bytes, displayer);
|
||
|
||
#if defined (VISIBLE_STATS)
|
||
if (rl_filename_completion_desired && (rl_visible_stats || _rl_complete_mark_directories))
|
||
#else
|
||
if (rl_filename_completion_desired && _rl_complete_mark_directories)
|
||
#endif
|
||
{
|
||
/* If to_print != full_pathname, to_print is the basename of the
|
||
path passed. In this case, we try to expand the directory
|
||
name before checking for the stat character. */
|
||
if (to_print != full_pathname)
|
||
{
|
||
/* Terminate the directory name. */
|
||
c = to_print[-1];
|
||
to_print[-1] = '\0';
|
||
|
||
/* If setting the last slash in full_pathname to a NUL results in
|
||
full_pathname being the empty string, we are trying to complete
|
||
files in the root directory. If we pass a null string to the
|
||
bash directory completion hook, for example, it will expand it
|
||
to the current directory. We just want the `/'. */
|
||
if (full_pathname == 0 || *full_pathname == 0)
|
||
dn = "/";
|
||
else if (full_pathname[0] != '/')
|
||
dn = full_pathname;
|
||
else if (full_pathname[1] == 0)
|
||
dn = "//"; /* restore trailing slash to `//' */
|
||
else if (full_pathname[1] == '/' && full_pathname[2] == 0)
|
||
dn = "/"; /* don't turn /// into // */
|
||
else
|
||
dn = full_pathname;
|
||
s = tilde_expand (dn);
|
||
if (rl_directory_completion_hook)
|
||
(*rl_directory_completion_hook) (&s);
|
||
|
||
slen = strlen (s);
|
||
tlen = strlen (to_print);
|
||
new_full_pathname = (char *)xmalloc (slen + tlen + 2);
|
||
strcpy (new_full_pathname, s);
|
||
if (s[slen - 1] == '/')
|
||
slen--;
|
||
else
|
||
new_full_pathname[slen] = '/';
|
||
new_full_pathname[slen] = '/';
|
||
strcpy (new_full_pathname + slen + 1, to_print);
|
||
|
||
#if defined (VISIBLE_STATS)
|
||
if (rl_visible_stats)
|
||
extension_char = stat_char (new_full_pathname);
|
||
else
|
||
#endif
|
||
if (gdb_path_isdir (new_full_pathname))
|
||
extension_char = '/';
|
||
|
||
xfree (new_full_pathname);
|
||
to_print[-1] = c;
|
||
}
|
||
else
|
||
{
|
||
s = tilde_expand (full_pathname);
|
||
#if defined (VISIBLE_STATS)
|
||
if (rl_visible_stats)
|
||
extension_char = stat_char (s);
|
||
else
|
||
#endif
|
||
if (gdb_path_isdir (s))
|
||
extension_char = '/';
|
||
}
|
||
|
||
xfree (s);
|
||
if (extension_char)
|
||
{
|
||
displayer->putch (displayer, extension_char);
|
||
printed_len++;
|
||
}
|
||
}
|
||
|
||
return printed_len;
|
||
}
|
||
|
||
/* GDB version of readline/complete.c:complete_get_screenwidth. */
|
||
|
||
static int
|
||
gdb_complete_get_screenwidth (const struct match_list_displayer *displayer)
|
||
{
|
||
/* Readline has other stuff here which it's not clear we need. */
|
||
return displayer->width;
|
||
}
|
||
|
||
extern int _rl_completion_prefix_display_length;
|
||
extern int _rl_print_completions_horizontally;
|
||
|
||
EXTERN_C int _rl_qsort_string_compare (const void *, const void *);
|
||
typedef int QSFUNC (const void *, const void *);
|
||
|
||
/* GDB version of readline/complete.c:rl_display_match_list.
|
||
See gdb_display_match_list for a description of MATCHES, LEN, MAX.
|
||
Returns non-zero if all matches are displayed. */
|
||
|
||
static int
|
||
gdb_display_match_list_1 (char **matches, int len, int max,
|
||
const struct match_list_displayer *displayer)
|
||
{
|
||
int count, limit, printed_len, lines, cols;
|
||
int i, j, k, l, common_length, sind;
|
||
char *temp, *t;
|
||
int page_completions = displayer->height != INT_MAX && pagination_enabled;
|
||
|
||
/* Find the length of the prefix common to all items: length as displayed
|
||
characters (common_length) and as a byte index into the matches (sind) */
|
||
common_length = sind = 0;
|
||
if (_rl_completion_prefix_display_length > 0)
|
||
{
|
||
t = gdb_printable_part (matches[0]);
|
||
temp = strrchr (t, '/');
|
||
common_length = temp ? gdb_fnwidth (temp) : gdb_fnwidth (t);
|
||
sind = temp ? strlen (temp) : strlen (t);
|
||
|
||
if (common_length > _rl_completion_prefix_display_length && common_length > ELLIPSIS_LEN)
|
||
max -= common_length - ELLIPSIS_LEN;
|
||
else
|
||
common_length = sind = 0;
|
||
}
|
||
|
||
/* How many items of MAX length can we fit in the screen window? */
|
||
cols = gdb_complete_get_screenwidth (displayer);
|
||
max += 2;
|
||
limit = cols / max;
|
||
if (limit != 1 && (limit * max == cols))
|
||
limit--;
|
||
|
||
/* If cols == 0, limit will end up -1 */
|
||
if (cols < displayer->width && limit < 0)
|
||
limit = 1;
|
||
|
||
/* Avoid a possible floating exception. If max > cols,
|
||
limit will be 0 and a divide-by-zero fault will result. */
|
||
if (limit == 0)
|
||
limit = 1;
|
||
|
||
/* How many iterations of the printing loop? */
|
||
count = (len + (limit - 1)) / limit;
|
||
|
||
/* Watch out for special case. If LEN is less than LIMIT, then
|
||
just do the inner printing loop.
|
||
0 < len <= limit implies count = 1. */
|
||
|
||
/* Sort the items if they are not already sorted. */
|
||
if (rl_ignore_completion_duplicates == 0 && rl_sort_completion_matches)
|
||
qsort (matches + 1, len, sizeof (char *), (QSFUNC *)_rl_qsort_string_compare);
|
||
|
||
displayer->crlf (displayer);
|
||
|
||
lines = 0;
|
||
if (_rl_print_completions_horizontally == 0)
|
||
{
|
||
/* Print the sorted items, up-and-down alphabetically, like ls. */
|
||
for (i = 1; i <= count; i++)
|
||
{
|
||
for (j = 0, l = i; j < limit; j++)
|
||
{
|
||
if (l > len || matches[l] == 0)
|
||
break;
|
||
else
|
||
{
|
||
temp = gdb_printable_part (matches[l]);
|
||
printed_len = gdb_print_filename (temp, matches[l], sind,
|
||
displayer);
|
||
|
||
if (j + 1 < limit)
|
||
for (k = 0; k < max - printed_len; k++)
|
||
displayer->putch (displayer, ' ');
|
||
}
|
||
l += count;
|
||
}
|
||
displayer->crlf (displayer);
|
||
lines++;
|
||
if (page_completions && lines >= (displayer->height - 1) && i < count)
|
||
{
|
||
lines = gdb_display_match_list_pager (lines, displayer);
|
||
if (lines < 0)
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Print the sorted items, across alphabetically, like ls -x. */
|
||
for (i = 1; matches[i]; i++)
|
||
{
|
||
temp = gdb_printable_part (matches[i]);
|
||
printed_len = gdb_print_filename (temp, matches[i], sind, displayer);
|
||
/* Have we reached the end of this line? */
|
||
if (matches[i+1])
|
||
{
|
||
if (i && (limit > 1) && (i % limit) == 0)
|
||
{
|
||
displayer->crlf (displayer);
|
||
lines++;
|
||
if (page_completions && lines >= displayer->height - 1)
|
||
{
|
||
lines = gdb_display_match_list_pager (lines, displayer);
|
||
if (lines < 0)
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
for (k = 0; k < max - printed_len; k++)
|
||
displayer->putch (displayer, ' ');
|
||
}
|
||
}
|
||
displayer->crlf (displayer);
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Utility for displaying completion list matches, used by both CLI and TUI.
|
||
|
||
MATCHES is the list of strings, in argv format, LEN is the number of
|
||
strings in MATCHES, and MAX is the length of the longest string in
|
||
MATCHES. */
|
||
|
||
void
|
||
gdb_display_match_list (char **matches, int len, int max,
|
||
const struct match_list_displayer *displayer)
|
||
{
|
||
/* Readline will never call this if complete_line returned NULL. */
|
||
gdb_assert (max_completions != 0);
|
||
|
||
/* complete_line will never return more than this. */
|
||
if (max_completions > 0)
|
||
gdb_assert (len <= max_completions);
|
||
|
||
if (rl_completion_query_items > 0 && len >= rl_completion_query_items)
|
||
{
|
||
char msg[100];
|
||
|
||
/* We can't use *query here because they wait for <RET> which is
|
||
wrong here. This follows the readline version as closely as possible
|
||
for compatibility's sake. See readline/complete.c. */
|
||
|
||
displayer->crlf (displayer);
|
||
|
||
xsnprintf (msg, sizeof (msg),
|
||
"Display all %d possibilities? (y or n)", len);
|
||
displayer->puts (displayer, msg);
|
||
displayer->flush (displayer);
|
||
|
||
if (gdb_get_y_or_n (0, displayer) == 0)
|
||
{
|
||
displayer->crlf (displayer);
|
||
return;
|
||
}
|
||
}
|
||
|
||
if (gdb_display_match_list_1 (matches, len, max, displayer))
|
||
{
|
||
/* Note: MAX_COMPLETIONS may be -1 or zero, but LEN is always > 0. */
|
||
if (len == max_completions)
|
||
{
|
||
/* The maximum number of completions has been reached. Warn the user
|
||
that there may be more. */
|
||
const char *message = get_max_completions_reached_message ();
|
||
|
||
displayer->puts (displayer, message);
|
||
displayer->crlf (displayer);
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
_initialize_completer (void)
|
||
{
|
||
add_setshow_zuinteger_unlimited_cmd ("max-completions", no_class,
|
||
&max_completions, _("\
|
||
Set maximum number of completion candidates."), _("\
|
||
Show maximum number of completion candidates."), _("\
|
||
Use this to limit the number of candidates considered\n\
|
||
during completion. Specifying \"unlimited\" or -1\n\
|
||
disables limiting. Note that setting either no limit or\n\
|
||
a very large limit can make completion slow."),
|
||
NULL, NULL, &setlist, &showlist);
|
||
}
|