286 lines
8.9 KiB
C
286 lines
8.9 KiB
C
/* Basic C++ demangling support for GDB.
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support.
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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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/* This file contains support code for C++ demangling that is common
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to a styles of demangling, and GDB specific. */
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#include "defs.h"
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#include "cli/cli-utils.h" /* for skip_to_space */
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#include "command.h"
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#include "gdbcmd.h"
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#include "demangle.h"
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#include "gdb-demangle.h"
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#include "language.h"
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/* Select the default C++ demangling style to use. The default is "auto",
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which allows gdb to attempt to pick an appropriate demangling style for
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the executable it has loaded. It can be set to a specific style ("gnu",
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"lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto
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selection of the style unless you do an explicit "set demangle auto".
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To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in
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the appropriate target configuration file. */
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#ifndef DEFAULT_DEMANGLING_STYLE
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#define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING
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#endif
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static void demangle_command (char *, int);
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/* See documentation in gdb-demangle.h. */
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int demangle = 1;
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static void
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show_demangle (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file,
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_("Demangling of encoded C++/ObjC names "
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"when displaying symbols is %s.\n"),
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value);
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}
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/* See documentation in gdb-demangle.h. */
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int asm_demangle = 0;
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static void
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show_asm_demangle (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file,
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_("Demangling of C++/ObjC names in "
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"disassembly listings is %s.\n"),
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value);
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}
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/* String name for the current demangling style. Set by the
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"set demangle-style" command, printed as part of the output by the
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"show demangle-style" command. */
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static const char *current_demangling_style_string;
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/* The array of names of the known demanglyng styles. Generated by
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_initialize_demangler from libiberty_demanglers[] array. */
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static const char **demangling_style_names;
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static void
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show_demangling_style_names(struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"),
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value);
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}
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/* Set current demangling style. Called by the "set demangle-style"
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command after it has updated the current_demangling_style_string to
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match what the user has entered.
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If the user has entered a string that matches a known demangling style
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name in the demanglers[] array then just leave the string alone and update
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the current_demangling_style enum value to match.
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If the user has entered a string that doesn't match, including an empty
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string, then print a list of the currently known styles and restore
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the current_demangling_style_string to match the current_demangling_style
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enum value.
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Note: Assumes that current_demangling_style_string always points to
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a malloc'd string, even if it is a null-string. */
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static void
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set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c)
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{
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const struct demangler_engine *dem;
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int i;
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/* First just try to match whatever style name the user supplied with
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one of the known ones. Don't bother special casing for an empty
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name, we just treat it as any other style name that doesn't match.
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If we match, update the current demangling style enum. */
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for (dem = libiberty_demanglers, i = 0;
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dem->demangling_style != unknown_demangling;
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dem++)
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{
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if (strcmp (current_demangling_style_string,
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dem->demangling_style_name) == 0)
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{
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current_demangling_style = dem->demangling_style;
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current_demangling_style_string = demangling_style_names[i];
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break;
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}
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i++;
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}
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/* We should have found a match, given we only add known styles to
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the enumeration list. */
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gdb_assert (dem->demangling_style != unknown_demangling);
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}
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/* G++ uses a special character to indicate certain internal names. Which
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character it is depends on the platform:
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- Usually '$' on systems where the assembler will accept that
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- Usually '.' otherwise (this includes most sysv4-like systems and most
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ELF targets)
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- Occasionally '_' if neither of the above is usable
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We check '$' first because it is the safest, and '.' often has another
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meaning. We don't currently try to handle '_' because the precise forms
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of the names are different on those targets. */
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static char cplus_markers[] = {'$', '.', '\0'};
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/* See documentation in gdb-demangle.h. */
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int
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is_cplus_marker (int c)
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{
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return c && strchr (cplus_markers, c) != NULL;
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}
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/* Demangle the given string in the current language. */
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static void
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demangle_command (char *args, int from_tty)
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{
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char *demangled, *name, *lang_name = NULL;
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char *arg_buf, *arg_start;
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int processing_args = 1;
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const struct language_defn *lang;
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struct cleanup *cleanups;
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arg_buf = xstrdup (args != NULL ? args : "");
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cleanups = make_cleanup (xfree, arg_buf);
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arg_start = arg_buf;
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while (processing_args
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&& *arg_start == '-')
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{
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char *p = skip_to_space (arg_start);
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if (strncmp (arg_start, "-l", p - arg_start) == 0)
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{
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char *lang_name_end;
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lang_name = skip_spaces (p);
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lang_name_end = skip_to_space (lang_name);
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lang_name = savestring (lang_name, lang_name_end - lang_name);
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make_cleanup (xfree, lang_name);
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p = lang_name_end;
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}
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else if (strncmp (arg_start, "--", p - arg_start) == 0)
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processing_args = 0;
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else
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{
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*p = '\0';
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error (_("Unrecognized option '%s' to demangle command. "
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"Try \"help demangle\"."), arg_start);
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}
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arg_start = skip_spaces (p);
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}
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name = arg_start;
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if (*name == '\0')
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error (_("Usage: demangle [-l language] [--] name"));
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if (lang_name != NULL)
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{
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enum language lang_enum;
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lang_enum = language_enum (lang_name);
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if (lang_enum == language_unknown)
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error (_("Unknown language \"%s\""), lang_name);
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lang = language_def (lang_enum);
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}
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else
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lang = current_language;
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demangled = language_demangle (lang, name, DMGL_ANSI | DMGL_PARAMS);
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if (demangled != NULL)
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{
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printf_filtered ("%s\n", demangled);
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xfree (demangled);
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}
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else
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error (_("Can't demangle \"%s\""), name);
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do_cleanups (cleanups);
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}
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extern initialize_file_ftype _initialize_demangler; /* -Wmissing-prototypes */
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void
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_initialize_demangler (void)
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{
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int i, ndems;
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/* Fill the demangling_style_names[] array, and set the default
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demangling style chosen at compilation time. */
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for (ndems = 0;
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libiberty_demanglers[ndems].demangling_style != unknown_demangling;
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ndems++)
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;
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demangling_style_names = XCNEWVEC (const char *, ndems + 1);
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for (i = 0;
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libiberty_demanglers[i].demangling_style != unknown_demangling;
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i++)
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{
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demangling_style_names[i]
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= xstrdup (libiberty_demanglers[i].demangling_style_name);
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if (current_demangling_style_string == NULL
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&& strcmp (DEFAULT_DEMANGLING_STYLE, demangling_style_names[i]) == 0)
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current_demangling_style_string = demangling_style_names[i];
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}
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add_setshow_boolean_cmd ("demangle", class_support, &demangle, _("\
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Set demangling of encoded C++/ObjC names when displaying symbols."), _("\
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Show demangling of encoded C++/ObjC names when displaying symbols."), NULL,
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NULL,
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show_demangle,
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&setprintlist, &showprintlist);
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add_setshow_boolean_cmd ("asm-demangle", class_support, &asm_demangle, _("\
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Set demangling of C++/ObjC names in disassembly listings."), _("\
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Show demangling of C++/ObjC names in disassembly listings."), NULL,
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NULL,
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show_asm_demangle,
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&setprintlist, &showprintlist);
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add_setshow_enum_cmd ("demangle-style", class_support,
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demangling_style_names,
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¤t_demangling_style_string, _("\
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Set the current C++ demangling style."), _("\
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Show the current C++ demangling style."), _("\
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Use `set demangle-style' without arguments for a list of demangling styles."),
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set_demangling_command,
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show_demangling_style_names,
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&setlist, &showlist);
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add_cmd ("demangle", class_support, demangle_command, _("\
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Demangle a mangled name.\n\
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Usage: demangle [-l language] [--] name\n\
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If LANGUAGE is not specified, NAME is demangled in the current language."),
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&cmdlist);
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}
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