279 lines
8.5 KiB
C
279 lines
8.5 KiB
C
/* C preprocessor macro expansion commands for GDB.
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Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.
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Contributed by Red Hat, 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 "macrotab.h"
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#include "macroexp.h"
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#include "macroscope.h"
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#include "command.h"
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#include "gdbcmd.h"
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/* The `macro' prefix command. */
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static struct cmd_list_element *macrolist;
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static void
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macro_command (char *arg, int from_tty)
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{
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printf_unfiltered
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("\"macro\" must be followed by the name of a macro command.\n");
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help_list (macrolist, "macro ", -1, gdb_stdout);
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}
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/* Macro expansion commands. */
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static void
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macro_expand_command (char *exp, int from_tty)
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{
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struct macro_scope *ms = NULL;
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char *expanded = NULL;
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struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms);
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make_cleanup (free_current_contents, &expanded);
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/* You know, when the user doesn't specify any expression, it would be
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really cool if this defaulted to the last expression evaluated.
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Then it would be easy to ask, "Hey, what did I just evaluate?" But
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at the moment, the `print' commands don't save the last expression
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evaluated, just its value. */
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if (! exp || ! *exp)
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error (_("You must follow the `macro expand' command with the"
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" expression you\n"
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"want to expand."));
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ms = default_macro_scope ();
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if (ms)
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{
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expanded = macro_expand (exp, standard_macro_lookup, ms);
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fputs_filtered ("expands to: ", gdb_stdout);
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fputs_filtered (expanded, gdb_stdout);
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fputs_filtered ("\n", gdb_stdout);
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}
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else
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fputs_filtered ("GDB has no preprocessor macro information for "
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"that code.\n",
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gdb_stdout);
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do_cleanups (cleanup_chain);
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return;
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}
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static void
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macro_expand_once_command (char *exp, int from_tty)
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{
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struct macro_scope *ms = NULL;
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char *expanded = NULL;
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struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms);
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make_cleanup (free_current_contents, &expanded);
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/* You know, when the user doesn't specify any expression, it would be
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really cool if this defaulted to the last expression evaluated.
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And it should set the once-expanded text as the new `last
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expression'. That way, you could just hit return over and over and
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see the expression expanded one level at a time. */
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if (! exp || ! *exp)
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error (_("You must follow the `macro expand-once' command with"
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" the expression\n"
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"you want to expand."));
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ms = default_macro_scope ();
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if (ms)
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{
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expanded = macro_expand_once (exp, standard_macro_lookup, ms);
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fputs_filtered ("expands to: ", gdb_stdout);
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fputs_filtered (expanded, gdb_stdout);
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fputs_filtered ("\n", gdb_stdout);
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}
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else
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fputs_filtered ("GDB has no preprocessor macro information for "
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"that code.\n",
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gdb_stdout);
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do_cleanups (cleanup_chain);
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return;
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}
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static void
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show_pp_source_pos (struct ui_file *stream,
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struct macro_source_file *file,
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int line)
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{
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fprintf_filtered (stream, "%s:%d\n", file->filename, line);
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while (file->included_by)
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{
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fprintf_filtered (gdb_stdout, " included at %s:%d\n",
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file->included_by->filename,
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file->included_at_line);
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file = file->included_by;
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}
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}
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static void
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info_macro_command (char *name, int from_tty)
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{
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struct macro_scope *ms = NULL;
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struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms);
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struct macro_definition *d;
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if (! name || ! *name)
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error (_("You must follow the `info macro' command with the name"
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" of the macro\n"
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"whose definition you want to see."));
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ms = default_macro_scope ();
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if (! ms)
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error (_("GDB has no preprocessor macro information for that code."));
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d = macro_lookup_definition (ms->file, ms->line, name);
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if (d)
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{
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int line;
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struct macro_source_file *file
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= macro_definition_location (ms->file, ms->line, name, &line);
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fprintf_filtered (gdb_stdout, "Defined at ");
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show_pp_source_pos (gdb_stdout, file, line);
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fprintf_filtered (gdb_stdout, "#define %s", name);
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if (d->kind == macro_function_like)
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{
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int i;
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fputs_filtered ("(", gdb_stdout);
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for (i = 0; i < d->argc; i++)
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{
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fputs_filtered (d->argv[i], gdb_stdout);
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if (i + 1 < d->argc)
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fputs_filtered (", ", gdb_stdout);
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}
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fputs_filtered (")", gdb_stdout);
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}
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fprintf_filtered (gdb_stdout, " %s\n", d->replacement);
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}
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else
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{
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fprintf_filtered (gdb_stdout,
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"The symbol `%s' has no definition as a C/C++"
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" preprocessor macro\n"
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"at ", name);
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show_pp_source_pos (gdb_stdout, ms->file, ms->line);
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}
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do_cleanups (cleanup_chain);
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}
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/* User-defined macros. */
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/* A table of user-defined macros. Unlike the macro tables used for
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symtabs, this one uses xmalloc for all its allocation, not an
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obstack, and it doesn't bcache anything; it just xmallocs things. So
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it's perfectly possible to remove things from this, or redefine
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things. */
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static struct macro_table *user_macros;
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static void
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macro_define_command (char *exp, int from_tty)
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{
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error (_("Command not implemented yet."));
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}
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static void
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macro_undef_command (char *exp, int from_tty)
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{
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error (_("Command not implemented yet."));
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}
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static void
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macro_list_command (char *exp, int from_tty)
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{
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error (_("Command not implemented yet."));
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}
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/* Initializing the `macrocmd' module. */
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extern initialize_file_ftype _initialize_macrocmd; /* -Wmissing-prototypes */
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void
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_initialize_macrocmd (void)
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{
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struct cmd_list_element *c;
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/* We introduce a new command prefix, `macro', under which we'll put
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the various commands for working with preprocessor macros. */
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add_prefix_cmd ("macro", class_info, macro_command,
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_("Prefix for commands dealing with C preprocessor macros."),
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¯olist, "macro ", 0, &cmdlist);
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add_cmd ("expand", no_class, macro_expand_command, _("\
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Fully expand any C/C++ preprocessor macro invocations in EXPRESSION.\n\
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Show the expanded expression."),
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¯olist);
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add_alias_cmd ("exp", "expand", no_class, 1, ¯olist);
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add_cmd ("expand-once", no_class, macro_expand_once_command, _("\
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Expand C/C++ preprocessor macro invocations appearing directly in EXPRESSION.\n\
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Show the expanded expression.\n\
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\n\
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This command differs from `macro expand' in that it only expands macro\n\
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invocations that appear directly in EXPRESSION; if expanding a macro\n\
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introduces further macro invocations, those are left unexpanded.\n\
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\n\
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`macro expand-once' helps you see how a particular macro expands,\n\
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whereas `macro expand' shows you how all the macros involved in an\n\
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expression work together to yield a pre-processed expression."),
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¯olist);
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add_alias_cmd ("exp1", "expand-once", no_class, 1, ¯olist);
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add_cmd ("macro", no_class, info_macro_command,
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_("Show the definition of MACRO, and its source location."),
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&infolist);
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add_cmd ("define", no_class, macro_define_command, _("\
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Define a new C/C++ preprocessor macro.\n\
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The GDB command `macro define DEFINITION' is equivalent to placing a\n\
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preprocessor directive of the form `#define DEFINITION' such that the\n\
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definition is visible in all the inferior's source files.\n\
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For example:\n\
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(gdb) macro define PI (3.1415926)\n\
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(gdb) macro define MIN(x,y) ((x) < (y) ? (x) : (y))"),
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¯olist);
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add_cmd ("undef", no_class, macro_undef_command, _("\
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Remove the definition of the C/C++ preprocessor macro with the given name."),
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¯olist);
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add_cmd ("list", no_class, macro_list_command,
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_("List all the macros defined using the `macro define' command."),
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¯olist);
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user_macros = new_macro_table (0, 0);
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}
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