From 6821892ed4f6f609e09b137d7163c712ded7a0be Mon Sep 17 00:00:00 2001 From: Jim Blandy Date: Thu, 16 May 2002 21:15:53 +0000 Subject: Add commands for manually expanding macros and showing their definitions. * macrocmd.c, macroscope.c, macroscope.h: New files. * Makefile.in (SFILES): Add macrocmd.c, macroscope.c. (macroscope_h): New variable. (HFILES_NO_SRCDIR): Add macroscope.h. (COMMON_OBS): Add macrocmd.o, macroscope.o. (macroscope.o, macrocmd.o): New rules. --- gdb/macrocmd.c | 287 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 287 insertions(+) create mode 100644 gdb/macrocmd.c (limited to 'gdb/macrocmd.c') diff --git a/gdb/macrocmd.c b/gdb/macrocmd.c new file mode 100644 index 0000000..1d14735 --- /dev/null +++ b/gdb/macrocmd.c @@ -0,0 +1,287 @@ +/* C preprocessor macro expansion commands for GDB. + Copyright 2002 Free Software Foundation, Inc. + Contributed by Red Hat, 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 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. */ + + +#include "defs.h" +#include "macrotab.h" +#include "macroexp.h" +#include "macroscope.h" +#include "command.h" +#include "gdbcmd.h" + + +/* The `macro' prefix command. */ + +static struct cmd_list_element *macrolist; + +static void +macro_command (char *arg, int from_tty) +{ + printf_unfiltered + ("\"macro\" must be followed by the name of a macro command.\n"); + help_list (macrolist, "macro ", -1, gdb_stdout); +} + + + +/* Macro expansion commands. */ + + +static void +macro_expand_command (char *exp, int from_tty) +{ + struct macro_scope *ms = NULL; + char *expanded = NULL; + struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); + make_cleanup (free_current_contents, &expanded); + + /* You know, when the user doesn't specify any expression, it would be + really cool if this defaulted to the last expression evaluated. + Then it would be easy to ask, "Hey, what did I just evaluate?" But + at the moment, the `print' commands don't save the last expression + evaluated, just its value. */ + if (! exp || ! *exp) + error ("You must follow the `macro expand' command with the" + " expression you\n" + "want to expand."); + + ms = default_macro_scope (); + if (ms) + { + expanded = macro_expand (exp, standard_macro_lookup, ms); + fputs_filtered ("expands to: ", gdb_stdout); + fputs_filtered (expanded, gdb_stdout); + fputs_filtered ("\n", gdb_stdout); + } + else + fputs_filtered ("GDB has no preprocessor macro information for " + "that code.\n", + gdb_stdout); + + do_cleanups (cleanup_chain); + return; +} + + +static void +macro_expand_once_command (char *exp, int from_tty) +{ + struct macro_scope *ms = NULL; + char *expanded = NULL; + struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); + make_cleanup (free_current_contents, &expanded); + + /* You know, when the user doesn't specify any expression, it would be + really cool if this defaulted to the last expression evaluated. + And it should set the once-expanded text as the new `last + expression'. That way, you could just hit return over and over and + see the expression expanded one level at a time. */ + if (! exp || ! *exp) + error ("You must follow the `macro expand-once' command with" + " the expression\n" + "you want to expand."); + + ms = default_macro_scope (); + if (ms) + { + expanded = macro_expand_once (exp, standard_macro_lookup, ms); + fputs_filtered ("expands to: ", gdb_stdout); + fputs_filtered (expanded, gdb_stdout); + fputs_filtered ("\n", gdb_stdout); + } + else + fputs_filtered ("GDB has no preprocessor macro information for " + "that code.\n", + gdb_stdout); + + do_cleanups (cleanup_chain); + return; +} + + +static void +show_pp_source_pos (struct ui_file *stream, + struct macro_source_file *file, + int line) +{ + fprintf_filtered (stream, "%s:%d\n", file->filename, line); + + while (file->included_by) + { + fprintf_filtered (gdb_stdout, " included at %s:%d\n", + file->included_by->filename, + file->included_at_line); + file = file->included_by; + } +} + + +static void +show_macro_command (char *name, int from_tty) +{ + struct macro_scope *ms = NULL; + struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); + struct macro_definition *d; + + if (! name || ! *name) + error ("You must follow the `show macro' command with the name" + " of the macro\n" + "whose definition you want to see."); + + ms = default_macro_scope (); + if (! ms) + error ("GDB has no preprocessor macro information for that code.\n"); + + d = macro_lookup_definition (ms->file, ms->line, name); + if (d) + { + int line; + struct macro_source_file *file + = macro_definition_location (ms->file, ms->line, name, &line); + + fprintf_filtered (gdb_stdout, "Defined at "); + show_pp_source_pos (gdb_stdout, file, line); + fprintf_filtered (gdb_stdout, "#define %s", name); + if (d->kind == macro_function_like) + { + int i; + + fputs_filtered ("(", gdb_stdout); + for (i = 0; i < d->argc; i++) + { + fputs_filtered (d->argv[i], gdb_stdout); + if (i + 1 < d->argc) + fputs_filtered (", ", gdb_stdout); + } + fputs_filtered (")", gdb_stdout); + } + fprintf_filtered (gdb_stdout, " %s\n", d->replacement); + } + else + { + fprintf_filtered (gdb_stdout, + "The symbol `%s' has no definition as a C/C++" + " preprocessor macro\n" + "at ", name); + show_pp_source_pos (gdb_stdout, ms->file, ms->line); + } + + do_cleanups (cleanup_chain); +} + + + +/* User-defined macros. */ + +/* A table of user-defined macros. Unlike the macro tables used for + symtabs, this one uses xmalloc for all its allocation, not an + obstack, and it doesn't bcache anything; it just xmallocs things. So + it's perfectly possible to remove things from this, or redefine + things. */ +static struct macro_table *user_macros; + +static void +macro_define_command (char *exp, int from_tty) +{ + error ("Command not implemented yet."); +} + + +static void +macro_undef_command (char *exp, int from_tty) +{ + error ("Command not implemented yet."); +} + + +static void +macro_list_command (char *exp, int from_tty) +{ + error ("Command not implemented yet."); +} + + + +/* Initializing the `macrocmd' module. */ + +void +_initialize_macrocmd (void) +{ + struct cmd_list_element *c; + + /* We introduce a new command prefix, `macro', under which we'll put + the various commands for working with preprocessor macros. */ + add_prefix_cmd + ("macro", class_info, macro_command, + "Prefix for commands dealing with C preprocessor macros.", + ¯olist, "macro ", 0, &cmdlist); + + add_cmd + ("expand", no_class, macro_expand_command, + "Fully expand any C/C++ preprocessor macro invocations in EXPRESSION.\n" + "Show the expanded expression.", + ¯olist); + add_alias_cmd ("exp", "expand", no_class, 1, ¯olist); + add_cmd + ("expand-once", no_class, macro_expand_once_command, + "Expand C/C++ preprocessor macro invocations appearing directly in" + " EXPRESSION.\n" + "Show the expanded expression.\n" + "\n" + "This command differs from `macro expand' in that it only expands macro\n" + "invocations that appear directly in EXPRESSION; if expanding a macro\n" + "introduces further macro invocations, those are left unexpanded.\n" + "\n" + "`macro expand-once' helps you see how a particular macro expands,\n" + "whereas `macro expand' shows you how all the macros involved in an\n" + "expression work together to yield a pre-processed expression.", + ¯olist); + add_alias_cmd ("exp1", "expand-once", no_class, 1, ¯olist); + + add_cmd + ("macro", no_class, show_macro_command, + "Show the definition of MACRO, and its source location.", + &showlist); + + add_cmd + ("define", no_class, macro_define_command, + "Define a new C/C++ preprocessor macro.\n" + "The GDB command `macro define DEFINITION' is equivalent to placing a\n" + "preprocessor directive of the form `#define DEFINITION' such that the\n" + "definition is visible in all the inferior's source files.\n" + "For example:\n" + " (gdb) macro define PI (3.1415926)\n" + " (gdb) macro define MIN(x,y) ((x) < (y) ? (x) : (y))", + ¯olist); + + add_cmd + ("undef", no_class, macro_undef_command, + "Remove the definition of the C/C++ preprocessor macro with the" + " given name.", + ¯olist); + + add_cmd + ("list", no_class, macro_list_command, + "List all the macros defined using the `macro define' command.", + ¯olist); + + user_macros = new_macro_table (0, 0); +} -- cgit v1.1