492d29ea1c
This patch splits the TRY_CATCH macro into three, so that we go from
this:
~~~
volatile gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
}
if (ex.reason < 0)
{
}
~~~
to this:
~~~
TRY
{
}
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
~~~
Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.
This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.
TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:
TRY
{
}
// some code here.
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
Just like it isn't valid to do that with C++'s native try/catch.
By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.
The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved. After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch]. The result was folded into this patch so that GDB
still builds at each incremental step.
END_CATCH is necessary for two reasons:
First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:
#define CATCH(EXCEPTION, mask) \
for (struct gdb_exception EXCEPTION; \
exceptions_state_mc_catch (&EXCEPTION, MASK); \
EXCEPTION = exception_none)
would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.
Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow. That will
be done in END_CATCH.
After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.
IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.
gdb/ChangeLog.
2015-03-07 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (struct catcher) <exception>: No
longer a pointer to volatile exception. Now an exception value.
<mask>: Delete field.
(exceptions_state_mc_init): Remove all parameters. Adjust.
(exceptions_state_mc): No longer pop the catcher here.
(exceptions_state_mc_catch): New function.
(throw_exception): Adjust.
* common/common-exceptions.h (exceptions_state_mc_init): Remove
all parameters.
(exceptions_state_mc_catch): Declare.
(TRY_CATCH): Rename to ...
(TRY): ... this. Remove EXCEPTION and MASK parameters.
(CATCH, END_CATCH): New.
All callers adjusted.
gdb/gdbserver/ChangeLog:
2015-03-07 Pedro Alves <palves@redhat.com>
Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
instead.
1751 lines
49 KiB
C
1751 lines
49 KiB
C
/* Line completion stuff for GDB, the GNU debugger.
|
||
Copyright (C) 2000-2015 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "expression.h"
|
||
#include "filenames.h" /* For DOSish file names. */
|
||
#include "language.h"
|
||
#include "gdb_signals.h"
|
||
#include "target.h"
|
||
#include "reggroups.h"
|
||
#include "user-regs.h"
|
||
|
||
#include "cli/cli-decode.h"
|
||
|
||
/* FIXME: This is needed because of lookup_cmd_1 (). We should be
|
||
calling a hook instead so we eliminate the CLI dependency. */
|
||
#include "gdbcmd.h"
|
||
|
||
/* Needed for rl_completer_word_break_characters() and for
|
||
rl_filename_completion_function. */
|
||
#include "readline/readline.h"
|
||
|
||
/* readline defines this. */
|
||
#undef savestring
|
||
|
||
#include "completer.h"
|
||
|
||
/* Prototypes for local functions. */
|
||
static
|
||
char *line_completion_function (const char *text, int matches,
|
||
char *line_buffer,
|
||
int point);
|
||
|
||
/* readline uses the word breaks for two things:
|
||
(1) In figuring out where to point the TEXT parameter to the
|
||
rl_completion_entry_function. Since we don't use TEXT for much,
|
||
it doesn't matter a lot what the word breaks are for this purpose,
|
||
but it does affect how much stuff M-? lists.
|
||
(2) If one of the matches contains a word break character, readline
|
||
will quote it. That's why we switch between
|
||
current_language->la_word_break_characters() and
|
||
gdb_completer_command_word_break_characters. I'm not sure when
|
||
we need this behavior (perhaps for funky characters in C++
|
||
symbols?). */
|
||
|
||
/* Variables which are necessary for fancy command line editing. */
|
||
|
||
/* When completing on command names, we remove '-' from the list of
|
||
word break characters, since we use it in command names. If the
|
||
readline library sees one in any of the current completion strings,
|
||
it thinks that the string needs to be quoted and automatically
|
||
supplies a leading quote. */
|
||
static char *gdb_completer_command_word_break_characters =
|
||
" \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,";
|
||
|
||
/* When completing on file names, we remove from the list of word
|
||
break characters any characters that are commonly used in file
|
||
names, such as '-', '+', '~', etc. Otherwise, readline displays
|
||
incorrect completion candidates. */
|
||
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
|
||
/* MS-DOS and MS-Windows use colon as part of the drive spec, and most
|
||
programs support @foo style response files. */
|
||
static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@";
|
||
#else
|
||
static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?><";
|
||
#endif
|
||
|
||
/* Characters that can be used to quote completion strings. Note that
|
||
we can't include '"' because the gdb C parser treats such quoted
|
||
sequences as strings. */
|
||
static char *gdb_completer_quote_characters = "'";
|
||
|
||
/* Accessor for some completer data that may interest other files. */
|
||
|
||
char *
|
||
get_gdb_completer_quote_characters (void)
|
||
{
|
||
return gdb_completer_quote_characters;
|
||
}
|
||
|
||
/* Line completion interface function for readline. */
|
||
|
||
char *
|
||
readline_line_completion_function (const char *text, int matches)
|
||
{
|
||
return line_completion_function (text, matches,
|
||
rl_line_buffer, rl_point);
|
||
}
|
||
|
||
/* This can be used for functions which don't want to complete on
|
||
symbols but don't want to complete on anything else either. */
|
||
VEC (char_ptr) *
|
||
noop_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *prefix)
|
||
{
|
||
return NULL;
|
||
}
|
||
|
||
/* Complete on filenames. */
|
||
VEC (char_ptr) *
|
||
filename_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
int subsequent_name;
|
||
VEC (char_ptr) *return_val = NULL;
|
||
|
||
subsequent_name = 0;
|
||
while (1)
|
||
{
|
||
char *p, *q;
|
||
|
||
p = rl_filename_completion_function (text, subsequent_name);
|
||
if (p == NULL)
|
||
break;
|
||
/* We need to set subsequent_name to a non-zero value before the
|
||
continue line below, because otherwise, if the first file
|
||
seen by GDB is a backup file whose name ends in a `~', we
|
||
will loop indefinitely. */
|
||
subsequent_name = 1;
|
||
/* Like emacs, don't complete on old versions. Especially
|
||
useful in the "source" command. */
|
||
if (p[strlen (p) - 1] == '~')
|
||
{
|
||
xfree (p);
|
||
continue;
|
||
}
|
||
|
||
if (word == text)
|
||
/* Return exactly p. */
|
||
q = p;
|
||
else if (word > text)
|
||
{
|
||
/* Return some portion of p. */
|
||
q = xmalloc (strlen (p) + 5);
|
||
strcpy (q, p + (word - text));
|
||
xfree (p);
|
||
}
|
||
else
|
||
{
|
||
/* Return some of TEXT plus p. */
|
||
q = xmalloc (strlen (p) + (text - word) + 5);
|
||
strncpy (q, word, text - word);
|
||
q[text - word] = '\0';
|
||
strcat (q, p);
|
||
xfree (p);
|
||
}
|
||
VEC_safe_push (char_ptr, return_val, q);
|
||
}
|
||
#if 0
|
||
/* There is no way to do this just long enough to affect quote
|
||
inserting without also affecting the next completion. This
|
||
should be fixed in readline. FIXME. */
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters = "";
|
||
#endif
|
||
return return_val;
|
||
}
|
||
|
||
/* Complete on locations, which might be of two possible forms:
|
||
|
||
file:line
|
||
or
|
||
symbol+offset
|
||
|
||
This is intended to be used in commands that set breakpoints
|
||
etc. */
|
||
|
||
VEC (char_ptr) *
|
||
location_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
int n_syms, n_files, ix;
|
||
VEC (char_ptr) *fn_list = NULL;
|
||
VEC (char_ptr) *list = NULL;
|
||
const char *p;
|
||
int quote_found = 0;
|
||
int quoted = *text == '\'' || *text == '"';
|
||
int quote_char = '\0';
|
||
const char *colon = NULL;
|
||
char *file_to_match = NULL;
|
||
const char *symbol_start = text;
|
||
const char *orig_text = text;
|
||
size_t text_len;
|
||
|
||
/* Do we have an unquoted colon, as in "break foo.c:bar"? */
|
||
for (p = text; *p != '\0'; ++p)
|
||
{
|
||
if (*p == '\\' && p[1] == '\'')
|
||
p++;
|
||
else if (*p == '\'' || *p == '"')
|
||
{
|
||
quote_found = *p;
|
||
quote_char = *p++;
|
||
while (*p != '\0' && *p != quote_found)
|
||
{
|
||
if (*p == '\\' && p[1] == quote_found)
|
||
p++;
|
||
p++;
|
||
}
|
||
|
||
if (*p == quote_found)
|
||
quote_found = 0;
|
||
else
|
||
break; /* Hit the end of text. */
|
||
}
|
||
#if HAVE_DOS_BASED_FILE_SYSTEM
|
||
/* If we have a DOS-style absolute file name at the beginning of
|
||
TEXT, and the colon after the drive letter is the only colon
|
||
we found, pretend the colon is not there. */
|
||
else if (p < text + 3 && *p == ':' && p == text + 1 + quoted)
|
||
;
|
||
#endif
|
||
else if (*p == ':' && !colon)
|
||
{
|
||
colon = p;
|
||
symbol_start = p + 1;
|
||
}
|
||
else if (strchr (current_language->la_word_break_characters(), *p))
|
||
symbol_start = p + 1;
|
||
}
|
||
|
||
if (quoted)
|
||
text++;
|
||
text_len = strlen (text);
|
||
|
||
/* Where is the file name? */
|
||
if (colon)
|
||
{
|
||
char *s;
|
||
|
||
file_to_match = (char *) xmalloc (colon - text + 1);
|
||
strncpy (file_to_match, text, colon - text + 1);
|
||
/* Remove trailing colons and quotes from the file name. */
|
||
for (s = file_to_match + (colon - text);
|
||
s > file_to_match;
|
||
s--)
|
||
if (*s == ':' || *s == quote_char)
|
||
*s = '\0';
|
||
}
|
||
/* If the text includes a colon, they want completion only on a
|
||
symbol name after the colon. Otherwise, we need to complete on
|
||
symbols as well as on files. */
|
||
if (colon)
|
||
{
|
||
list = make_file_symbol_completion_list (symbol_start, word,
|
||
file_to_match);
|
||
xfree (file_to_match);
|
||
}
|
||
else
|
||
{
|
||
list = make_symbol_completion_list (symbol_start, word);
|
||
/* If text includes characters which cannot appear in a file
|
||
name, they cannot be asking for completion on files. */
|
||
if (strcspn (text,
|
||
gdb_completer_file_name_break_characters) == text_len)
|
||
fn_list = make_source_files_completion_list (text, text);
|
||
}
|
||
|
||
n_syms = VEC_length (char_ptr, list);
|
||
n_files = VEC_length (char_ptr, fn_list);
|
||
|
||
/* Catenate fn_list[] onto the end of list[]. */
|
||
if (!n_syms)
|
||
{
|
||
VEC_free (char_ptr, list); /* Paranoia. */
|
||
list = fn_list;
|
||
fn_list = NULL;
|
||
}
|
||
else
|
||
{
|
||
char *fn;
|
||
|
||
for (ix = 0; VEC_iterate (char_ptr, fn_list, ix, fn); ++ix)
|
||
VEC_safe_push (char_ptr, list, fn);
|
||
VEC_free (char_ptr, fn_list);
|
||
}
|
||
|
||
if (n_syms && n_files)
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
else if (n_files)
|
||
{
|
||
char *fn;
|
||
|
||
/* 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 (ix = 0; VEC_iterate (char_ptr, list, ix, fn); ++ix)
|
||
{
|
||
memmove (fn, fn + (word - text),
|
||
strlen (fn) + 1 - (word - text));
|
||
}
|
||
}
|
||
else if (!n_syms)
|
||
{
|
||
/* No completions at all. As the final resort, try completing
|
||
on the entire text as a symbol. */
|
||
list = make_symbol_completion_list (orig_text, word);
|
||
}
|
||
|
||
return list;
|
||
}
|
||
|
||
/* Helper for expression_completer which recursively adds field and
|
||
method names from TYPE, a struct or union type, to the array
|
||
OUTPUT. */
|
||
static void
|
||
add_struct_fields (struct type *type, VEC (char_ptr) **output,
|
||
char *fieldname, int namelen)
|
||
{
|
||
int i;
|
||
int computed_type_name = 0;
|
||
const char *type_name = NULL;
|
||
|
||
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))
|
||
VEC_safe_push (char_ptr, *output,
|
||
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_no_tag (type);
|
||
computed_type_name = 1;
|
||
}
|
||
/* Omit constructors from the completion list. */
|
||
if (!type_name || strcmp (type_name, name))
|
||
VEC_safe_push (char_ptr, *output, xstrdup (name));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Complete on expressions. Often this means completing on symbol
|
||
names, but some language parsers also have support for completing
|
||
field names. */
|
||
VEC (char_ptr) *
|
||
expression_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
struct type *type = NULL;
|
||
char *fieldname;
|
||
const char *p;
|
||
enum type_code code = TYPE_CODE_UNDEF;
|
||
|
||
/* Perform a tentative parse of the expression, to see whether a
|
||
field completion is required. */
|
||
fieldname = NULL;
|
||
TRY
|
||
{
|
||
type = parse_expression_for_completion (text, &fieldname, &code);
|
||
}
|
||
CATCH (except, RETURN_MASK_ERROR)
|
||
{
|
||
return NULL;
|
||
}
|
||
END_CATCH
|
||
|
||
if (fieldname && type)
|
||
{
|
||
for (;;)
|
||
{
|
||
CHECK_TYPEDEF (type);
|
||
if (TYPE_CODE (type) != TYPE_CODE_PTR
|
||
&& TYPE_CODE (type) != TYPE_CODE_REF)
|
||
break;
|
||
type = TYPE_TARGET_TYPE (type);
|
||
}
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_UNION
|
||
|| TYPE_CODE (type) == TYPE_CODE_STRUCT)
|
||
{
|
||
int flen = strlen (fieldname);
|
||
VEC (char_ptr) *result = NULL;
|
||
|
||
add_struct_fields (type, &result, fieldname, flen);
|
||
xfree (fieldname);
|
||
return result;
|
||
}
|
||
}
|
||
else if (fieldname && code != TYPE_CODE_UNDEF)
|
||
{
|
||
VEC (char_ptr) *result;
|
||
struct cleanup *cleanup = make_cleanup (xfree, fieldname);
|
||
|
||
result = make_symbol_completion_type (fieldname, fieldname, code);
|
||
do_cleanups (cleanup);
|
||
return result;
|
||
}
|
||
xfree (fieldname);
|
||
|
||
/* Commands which complete on locations want to see the entire
|
||
argument. */
|
||
for (p = word;
|
||
p > text && p[-1] != ' ' && p[-1] != '\t';
|
||
p--)
|
||
;
|
||
|
||
/* Not ideal but it is what we used to do before... */
|
||
return location_completer (ignore, p, word);
|
||
}
|
||
|
||
/* See definition in completer.h. */
|
||
|
||
void
|
||
set_gdb_completion_word_break_characters (completer_ftype *fn)
|
||
{
|
||
/* So far we are only interested in differentiating filename
|
||
completers from everything else. */
|
||
if (fn == filename_completer)
|
||
rl_completer_word_break_characters
|
||
= gdb_completer_file_name_break_characters;
|
||
else
|
||
rl_completer_word_break_characters
|
||
= gdb_completer_command_word_break_characters;
|
||
}
|
||
|
||
/* 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)
|
||
*/
|
||
|
||
typedef enum
|
||
{
|
||
handle_brkchars,
|
||
handle_completions,
|
||
handle_help
|
||
}
|
||
complete_line_internal_reason;
|
||
|
||
|
||
/* 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.
|
||
|
||
REASON is of type complete_line_internal_reason.
|
||
|
||
If REASON is handle_brkchars:
|
||
Preliminary phase, called by gdb_completion_word_break_characters
|
||
function, is used to determine the correct set of chars that are
|
||
word delimiters depending on the current command in line_buffer.
|
||
No completion list should be generated; the return value should be
|
||
NULL. This is checked by an assertion in that function.
|
||
|
||
If REASON is handle_completions:
|
||
Main phase, called by complete_line function, is used to get the list
|
||
of posible completions.
|
||
|
||
If REASON is handle_help:
|
||
Special case when completing a 'help' command. In this case,
|
||
once sub-command completions are exhausted, we simply return NULL.
|
||
*/
|
||
|
||
static VEC (char_ptr) *
|
||
complete_line_internal (const char *text,
|
||
const char *line_buffer, int point,
|
||
complete_line_internal_reason reason)
|
||
{
|
||
VEC (char_ptr) *list = NULL;
|
||
char *tmp_command;
|
||
const char *p;
|
||
int ignore_help_classes;
|
||
/* Pointer within tmp_command which corresponds to text. */
|
||
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. */
|
||
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';
|
||
/* 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);
|
||
|
||
if (point == 0)
|
||
{
|
||
/* An empty line we want to consider 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++;
|
||
}
|
||
|
||
if (!c)
|
||
{
|
||
/* It is an unrecognized command. So there are no
|
||
possible completions. */
|
||
list = NULL;
|
||
}
|
||
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". */
|
||
list = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* We're trying to complete on the command which was ambiguous.
|
||
This we can deal with. */
|
||
if (result_list)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (*result_list->prefixlist, p,
|
||
word, ignore_help_classes);
|
||
}
|
||
else
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (cmdlist, p, word,
|
||
ignore_help_classes);
|
||
}
|
||
/* Ensure that readline does the right thing with respect to
|
||
inserting quotes. */
|
||
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)
|
||
list = complete_on_cmdlist (*c->prefixlist, p, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
else if (reason == handle_help)
|
||
list = NULL;
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_enum (c->enums, p, word);
|
||
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. */
|
||
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 > tmp_command
|
||
&& strchr (gdb_completer_file_name_break_characters, p[-1]) == NULL;
|
||
p--)
|
||
;
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
else if (c->completer == location_completer)
|
||
{
|
||
/* Commands which complete on locations want to
|
||
see the entire argument. */
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& p[-1] != ' ' && p[-1] != '\t';
|
||
p--)
|
||
;
|
||
}
|
||
if (reason == handle_brkchars
|
||
&& c->completer_handle_brkchars != NULL)
|
||
(*c->completer_handle_brkchars) (c, p, word);
|
||
if (reason != handle_brkchars && c->completer != NULL)
|
||
list = (*c->completer) (c, p, word);
|
||
}
|
||
}
|
||
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;
|
||
}
|
||
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_cmdlist (result_list, q, word,
|
||
ignore_help_classes);
|
||
|
||
/* Ensure that readline does the right thing
|
||
with respect to inserting quotes. */
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_command_word_break_characters;
|
||
}
|
||
}
|
||
else if (reason == handle_help)
|
||
list = NULL;
|
||
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". */
|
||
list = NULL;
|
||
}
|
||
else if (c->enums)
|
||
{
|
||
if (reason != handle_brkchars)
|
||
list = complete_on_enum (c->enums, p, word);
|
||
}
|
||
else
|
||
{
|
||
/* It is a normal command. */
|
||
if (c->completer == filename_completer)
|
||
{
|
||
/* See the commentary above about the specifics
|
||
of file-name completion. */
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& strchr (gdb_completer_file_name_break_characters,
|
||
p[-1]) == NULL;
|
||
p--)
|
||
;
|
||
rl_completer_word_break_characters =
|
||
gdb_completer_file_name_break_characters;
|
||
}
|
||
else if (c->completer == location_completer)
|
||
{
|
||
for (p = word;
|
||
p > tmp_command
|
||
&& p[-1] != ' ' && p[-1] != '\t';
|
||
p--)
|
||
;
|
||
}
|
||
if (reason == handle_brkchars
|
||
&& c->completer_handle_brkchars != NULL)
|
||
(*c->completer_handle_brkchars) (c, p, word);
|
||
if (reason != handle_brkchars && c->completer != NULL)
|
||
list = (*c->completer) (c, p, word);
|
||
}
|
||
}
|
||
}
|
||
|
||
return list;
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
int max_completions = 200;
|
||
|
||
/* See completer.h. */
|
||
|
||
completion_tracker_t
|
||
new_completion_tracker (void)
|
||
{
|
||
if (max_completions <= 0)
|
||
return NULL;
|
||
|
||
return htab_create_alloc (max_completions,
|
||
htab_hash_string, (htab_eq) streq,
|
||
NULL, xcalloc, xfree);
|
||
}
|
||
|
||
/* Cleanup routine to free a completion tracker and reset the pointer
|
||
to NULL. */
|
||
|
||
static void
|
||
free_completion_tracker (void *p)
|
||
{
|
||
completion_tracker_t *tracker_ptr = p;
|
||
|
||
htab_delete (*tracker_ptr);
|
||
*tracker_ptr = NULL;
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
struct cleanup *
|
||
make_cleanup_free_completion_tracker (completion_tracker_t *tracker_ptr)
|
||
{
|
||
if (*tracker_ptr == NULL)
|
||
return make_cleanup (null_cleanup, NULL);
|
||
|
||
return make_cleanup (free_completion_tracker, tracker_ptr);
|
||
}
|
||
|
||
/* See completer.h. */
|
||
|
||
enum maybe_add_completion_enum
|
||
maybe_add_completion (completion_tracker_t tracker, char *name)
|
||
{
|
||
void **slot;
|
||
|
||
if (max_completions < 0)
|
||
return MAYBE_ADD_COMPLETION_OK;
|
||
if (max_completions == 0)
|
||
return MAYBE_ADD_COMPLETION_MAX_REACHED;
|
||
|
||
gdb_assert (tracker != NULL);
|
||
|
||
if (htab_elements (tracker) >= max_completions)
|
||
return MAYBE_ADD_COMPLETION_MAX_REACHED;
|
||
|
||
slot = htab_find_slot (tracker, name, INSERT);
|
||
|
||
if (*slot != HTAB_EMPTY_ENTRY)
|
||
return MAYBE_ADD_COMPLETION_DUPLICATE;
|
||
|
||
*slot = name;
|
||
|
||
return (htab_elements (tracker) < max_completions
|
||
? MAYBE_ADD_COMPLETION_OK
|
||
: MAYBE_ADD_COMPLETION_OK_MAX_REACHED);
|
||
}
|
||
|
||
void
|
||
throw_max_completions_reached_error (void)
|
||
{
|
||
throw_error (MAX_COMPLETIONS_REACHED_ERROR, _("Max completions reached."));
|
||
}
|
||
|
||
/* Generate completions all at once. Returns a vector of unique strings
|
||
allocated with xmalloc. Returns NULL if there are no completions
|
||
or if max_completions is 0. If max_completions is non-negative, this will
|
||
return 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. */
|
||
|
||
VEC (char_ptr) *
|
||
complete_line (const char *text, const char *line_buffer, int point)
|
||
{
|
||
VEC (char_ptr) *list;
|
||
VEC (char_ptr) *result = NULL;
|
||
struct cleanup *cleanups;
|
||
completion_tracker_t tracker;
|
||
char *candidate;
|
||
int ix, max_reached;
|
||
|
||
if (max_completions == 0)
|
||
return NULL;
|
||
list = complete_line_internal (text, line_buffer, point,
|
||
handle_completions);
|
||
if (max_completions < 0)
|
||
return list;
|
||
|
||
tracker = new_completion_tracker ();
|
||
cleanups = make_cleanup_free_completion_tracker (&tracker);
|
||
make_cleanup_free_char_ptr_vec (list);
|
||
|
||
/* Do a final test for too many completions. Individual completers may
|
||
do some of this, but are not required to. Duplicates are also removed
|
||
here. Otherwise the user is left scratching his/her head: readline and
|
||
complete_command will remove duplicates, and if removal of duplicates
|
||
there brings the total under max_completions the user may think gdb quit
|
||
searching too early. */
|
||
|
||
for (ix = 0, max_reached = 0;
|
||
!max_reached && VEC_iterate (char_ptr, list, ix, candidate);
|
||
++ix)
|
||
{
|
||
enum maybe_add_completion_enum add_status;
|
||
|
||
add_status = maybe_add_completion (tracker, candidate);
|
||
|
||
switch (add_status)
|
||
{
|
||
case MAYBE_ADD_COMPLETION_OK:
|
||
VEC_safe_push (char_ptr, result, xstrdup (candidate));
|
||
break;
|
||
case MAYBE_ADD_COMPLETION_OK_MAX_REACHED:
|
||
VEC_safe_push (char_ptr, result, xstrdup (candidate));
|
||
max_reached = 1;
|
||
break;
|
||
case MAYBE_ADD_COMPLETION_MAX_REACHED:
|
||
gdb_assert_not_reached ("more than max completions reached");
|
||
case MAYBE_ADD_COMPLETION_DUPLICATE:
|
||
break;
|
||
}
|
||
}
|
||
|
||
do_cleanups (cleanups);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Complete on command names. Used by "help". */
|
||
VEC (char_ptr) *
|
||
command_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
return complete_line_internal (word, text,
|
||
strlen (text), handle_help);
|
||
}
|
||
|
||
/* Complete on signals. */
|
||
|
||
VEC (char_ptr) *
|
||
signal_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
VEC (char_ptr) *return_val = NULL;
|
||
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)
|
||
VEC_safe_push (char_ptr, return_val, xstrdup (signame));
|
||
}
|
||
|
||
return return_val;
|
||
}
|
||
|
||
/* Complete on a register or reggroup. */
|
||
|
||
VEC (char_ptr) *
|
||
reg_or_group_completer (struct cmd_list_element *ignore,
|
||
const char *text, const char *word)
|
||
{
|
||
VEC (char_ptr) *result = NULL;
|
||
size_t len = strlen (word);
|
||
struct gdbarch *gdbarch;
|
||
struct reggroup *group;
|
||
const char *name;
|
||
int i;
|
||
|
||
if (!target_has_registers)
|
||
return result;
|
||
|
||
gdbarch = get_frame_arch (get_selected_frame (NULL));
|
||
|
||
for (i = 0;
|
||
(name = user_reg_map_regnum_to_name (gdbarch, i)) != NULL;
|
||
i++)
|
||
{
|
||
if (*name != '\0' && strncmp (word, name, len) == 0)
|
||
VEC_safe_push (char_ptr, result, xstrdup (name));
|
||
}
|
||
|
||
for (group = reggroup_next (gdbarch, NULL);
|
||
group != NULL;
|
||
group = reggroup_next (gdbarch, group))
|
||
{
|
||
name = reggroup_name (group);
|
||
if (strncmp (word, name, len) == 0)
|
||
VEC_safe_push (char_ptr, result, xstrdup (name));
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Get the list of chars that are considered as word breaks
|
||
for the current command. */
|
||
|
||
char *
|
||
gdb_completion_word_break_characters (void)
|
||
{
|
||
VEC (char_ptr) *list;
|
||
|
||
list = complete_line_internal (rl_line_buffer, rl_line_buffer, rl_point,
|
||
handle_brkchars);
|
||
gdb_assert (list == NULL);
|
||
return rl_completer_word_break_characters;
|
||
}
|
||
|
||
/* Generate completions one by one for the completer. Each time we
|
||
are called return another potential completion to the caller.
|
||
line_completion just completes on commands or passes the buck to
|
||
the command's completer function, the stuff specific to symbol
|
||
completion is in make_symbol_completion_list.
|
||
|
||
TEXT is the caller's idea of the "word" we are looking at.
|
||
|
||
MATCHES is the number of matches that have currently been collected
|
||
from calling this completion function. When zero, then we need to
|
||
initialize, otherwise the initialization has already taken place
|
||
and we can just return the next potential completion string.
|
||
|
||
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.
|
||
|
||
Returns NULL if there are no more completions, else a pointer to a
|
||
string which is a possible completion, it is the caller's
|
||
responsibility to free the string. */
|
||
|
||
static char *
|
||
line_completion_function (const char *text, int matches,
|
||
char *line_buffer, int point)
|
||
{
|
||
static VEC (char_ptr) *list = NULL; /* Cache of completions. */
|
||
static int index; /* Next cached completion. */
|
||
char *output = NULL;
|
||
|
||
if (matches == 0)
|
||
{
|
||
/* The caller is beginning to accumulate a new set of
|
||
completions, so we need to find all of them now, and cache
|
||
them for returning one at a time on future calls. */
|
||
|
||
if (list)
|
||
{
|
||
/* Free the storage used by LIST, but not by the strings
|
||
inside. This is because rl_complete_internal () frees
|
||
the strings. As complete_line may abort by calling
|
||
`error' clear LIST now. */
|
||
VEC_free (char_ptr, list);
|
||
}
|
||
index = 0;
|
||
list = complete_line (text, line_buffer, point);
|
||
}
|
||
|
||
/* If we found a list of potential completions during initialization
|
||
then dole them out one at a time. After returning the last one,
|
||
return NULL (and continue to do so) each time we are called after
|
||
that, until a new list is available. */
|
||
|
||
if (list)
|
||
{
|
||
if (index < VEC_length (char_ptr, list))
|
||
{
|
||
output = VEC_index (char_ptr, list, index);
|
||
index++;
|
||
}
|
||
}
|
||
|
||
#if 0
|
||
/* Can't do this because readline hasn't yet checked the word breaks
|
||
for figuring out whether to insert a quote. */
|
||
if (output == NULL)
|
||
/* Make sure the word break characters are set back to normal for
|
||
the next time that readline tries to complete something. */
|
||
rl_completer_word_break_characters =
|
||
current_language->la_word_break_characters();
|
||
#endif
|
||
|
||
return (output);
|
||
}
|
||
|
||
/* 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, *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);
|
||
}
|
||
}
|
||
}
|
||
|
||
extern initialize_file_ftype _initialize_completer; /* -Wmissing-prototypes */
|
||
|
||
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);
|
||
}
|