/* Basic C++ demangling support for GDB. Copyright 1991, 1992, 1996, 1999 Free Software Foundation, Inc. Written by Fred Fish at Cygnus Support. 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This file contains support code for C++ demangling that is common to a styles of demangling, and GDB specific. */ #include "defs.h" #include "command.h" #include "gdbcmd.h" #include "demangle.h" #include "gdb_string.h" /* Select the default C++ demangling style to use. The default is "auto", which allows gdb to attempt to pick an appropriate demangling style for the executable it has loaded. It can be set to a specific style ("gnu", "lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto selection of the style unless you do an explicit "set demangle auto". To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in the appropriate target configuration file. */ #ifndef DEFAULT_DEMANGLING_STYLE #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING #endif extern void _initialize_demangler (void); /* String name for the current demangling style. Set by the "set demangle-style" command, printed as part of the output by the "show demangle-style" command. */ static char *current_demangling_style_string; /* List of supported demangling styles. Contains the name of the style as seen by the user, and the enum value that corresponds to that style. */ static const struct demangler { char *demangling_style_name; enum demangling_styles demangling_style; char *demangling_style_doc; } demanglers[] = { { AUTO_DEMANGLING_STYLE_STRING, auto_demangling, "Automatic selection based on executable" } , { GNU_DEMANGLING_STYLE_STRING, gnu_demangling, "GNU (g++) style demangling" } , { LUCID_DEMANGLING_STYLE_STRING, lucid_demangling, "Lucid (lcc) style demangling" } , { ARM_DEMANGLING_STYLE_STRING, arm_demangling, "ARM style demangling" } , { HP_DEMANGLING_STYLE_STRING, hp_demangling, "HP (aCC) style demangling" } , { EDG_DEMANGLING_STYLE_STRING, edg_demangling, "EDG style demangling" } , { NULL, unknown_demangling, NULL } }; static void set_demangling_command (char *, int, struct cmd_list_element *); /* Set current demangling style. Called by the "set demangle-style" command after it has updated the current_demangling_style_string to match what the user has entered. If the user has entered a string that matches a known demangling style name in the demanglers[] array then just leave the string alone and update the current_demangling_style enum value to match. If the user has entered a string that doesn't match, including an empty string, then print a list of the currently known styles and restore the current_demangling_style_string to match the current_demangling_style enum value. Note: Assumes that current_demangling_style_string always points to a malloc'd string, even if it is a null-string. */ static void set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c) { const struct demangler *dem; /* First just try to match whatever style name the user supplied with one of the known ones. Don't bother special casing for an empty name, we just treat it as any other style name that doesn't match. If we match, update the current demangling style enum. */ for (dem = demanglers; dem->demangling_style_name != NULL; dem++) { if (STREQ (current_demangling_style_string, dem->demangling_style_name)) { current_demangling_style = dem->demangling_style; break; } } /* Check to see if we found a match. If not, gripe about any non-empty style name and supply a list of valid ones. FIXME: This should probably be done with some sort of completion and with help. */ if (dem->demangling_style_name == NULL) { if (*current_demangling_style_string != '\0') { printf_unfiltered ("Unknown demangling style `%s'.\n", current_demangling_style_string); } printf_unfiltered ("The currently understood settings are:\n\n"); for (dem = demanglers; dem->demangling_style_name != NULL; dem++) { printf_unfiltered ("%-10s %s\n", dem->demangling_style_name, dem->demangling_style_doc); if (dem->demangling_style == current_demangling_style) { free (current_demangling_style_string); current_demangling_style_string = savestring (dem->demangling_style_name, strlen (dem->demangling_style_name)); } } if (current_demangling_style == unknown_demangling) { /* This can happen during initialization if gdb is compiled with a DEMANGLING_STYLE value that is unknown, so pick the first one as the default. */ current_demangling_style = demanglers[0].demangling_style; current_demangling_style_string = savestring (demanglers[0].demangling_style_name, strlen (demanglers[0].demangling_style_name)); warning ("`%s' style demangling chosen as the default.\n", current_demangling_style_string); } } } /* Fake a "set demangle-style" command. */ void set_demangling_style (char *style) { if (current_demangling_style_string != NULL) { free (current_demangling_style_string); } current_demangling_style_string = savestring (style, strlen (style)); set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL); } /* In order to allow a single demangler executable to demangle strings using various common values of CPLUS_MARKER, as well as any specific one set at compile time, we maintain a string containing all the commonly used ones, and check to see if the marker we are looking for is in that string. CPLUS_MARKER is usually '$' on systems where the assembler can deal with that. Where the assembler can't, it's usually '.' (but on many systems '.' is used for other things). We put the current defined CPLUS_MARKER first (which defaults to '$'), followed by the next most common value, followed by an explicit '$' in case the value of CPLUS_MARKER is not '$'. We could avoid this if we could just get g++ to tell us what the actual cplus marker character is as part of the debug information, perhaps by ensuring that it is the character that terminates the gcc<n>_compiled marker symbol (FIXME). */ static char cplus_markers[] = {CPLUS_MARKER, '.', '$', '\0'}; int is_cplus_marker (int c) { return c && strchr (cplus_markers, c) != NULL; } void _initialize_demangler (void) { struct cmd_list_element *set, *show; set = add_set_cmd ("demangle-style", class_support, var_string_noescape, (char *) ¤t_demangling_style_string, "Set the current C++ demangling style.\n\ Use `set demangle-style' without arguments for a list of demangling styles.", &setlist); show = add_show_from_set (set, &showlist); set->function.sfunc = set_demangling_command; /* Set the default demangling style chosen at compilation time. */ set_demangling_style (DEFAULT_DEMANGLING_STYLE); set_cplus_marker_for_demangling (CPLUS_MARKER); }