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Add commands for manually expanding macros and showing their

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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.
This commit is contained in:
Jim Blandy 2002-05-16 21:15:53 +00:00
parent 2e2761252b
commit 6821892ed4
5 changed files with 475 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
gdb/ChangeLog
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@ -1,5 +1,14 @@
2002-05-16 Jim Blandy <jimb@redhat.com>
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.
Teach the Dwarf 2 reader to read macro information.
* dwarf2read.c: #include "macrotab.h".
(dwarf_macinfo_buffer): New variable.

12
gdb/Makefile.in
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@ -539,7 +539,7 @@ SFILES = ax-general.c ax-gdb.c bcache.c blockframe.c breakpoint.c \
m2-exp.y m2-lang.c m2-typeprint.c m2-valprint.c main.c maint.c \
memattr.c mem-break.c minsyms.c mipsread.c nlmread.c objfiles.c \
p-exp.y p-lang.c p-typeprint.c p-valprint.c parse.c \
macrotab.c macroexp.c \
macrotab.c macroexp.c macrocmd.c macroscope.c \
printcmd.c remote.c remote-nrom.c scm-exp.c scm-lang.c \
scm-valprint.c source.c stabsread.c stack.c symfile.c \
symmisc.c symtab.c linespec.c target.c thread.c top.c tracepoint.c \
@ -639,6 +639,7 @@ language_h = language.h
linespec_h = linespec.h
macroexp_h = macroexp.h
macrotab_h = macrotab.h $(obstack_h) $(bcache_h)
macroscope_h = macroscope.h $(macrotab_h) $(symtab_h)
memattr_h = memattr.h
monitor_h = monitor.h
objfiles_h = objfiles.h
@ -677,7 +678,7 @@ HFILES_NO_SRCDIR = bcache.h buildsym.h call-cmds.h coff-solib.h defs.h \
gdb-stabs.h $(inferior_h) language.h minimon.h monitor.h \
objfiles.h parser-defs.h serial.h solib.h \
symfile.h stabsread.h target.h terminal.h typeprint.h xcoffsolib.h \
macrotab.h macroexp.h \
macrotab.h macroexp.h macroscope.h \
c-lang.h ch-lang.h f-lang.h \
jv-lang.h \
m2-lang.h p-lang.h \
@ -720,7 +721,7 @@ COMMON_OBS = version.o blockframe.o breakpoint.o findvar.o regcache.o \
source.o values.o eval.o valops.o valarith.o valprint.o printcmd.o \
symtab.o symfile.o symmisc.o linespec.o infcmd.o infrun.o \
expprint.o environ.o stack.o thread.o \
macrotab.o macroexp.o \
macrotab.o macrocmd.o macroexp.o macroscope.o \
event-loop.o event-top.o inf-loop.o completer.o \
gdbarch.o arch-utils.o gdbtypes.o copying.o $(DEPFILES) \
memattr.o mem-break.o target.o parse.o language.o $(YYOBJ) buildsym.o \
@ -2142,6 +2143,11 @@ macroexp.o: macroexp.c $(defs_h) $(macrotab_h)
macrotab.o: macrotab.c $(defs_h) $(obstack_h) $(objfiles_h) $(symtab_h) \
$(macrotab_h) $(splay_tree_h) gdb_assert.h $(bcache_h)
macroscope.o: macroscope.c $(defs_h) $(macroscope_h)
macrocmd.o: macrocmd.c $(defs_h) $(macrotab_h) $(macroexp_h) \
$(macroscope_h) $(command_h) $(gdbcmd_h)
target.o: target.c $(bfd_h) $(defs_h) $(gdbcmd_h) $(inferior_h) \
$(objfiles_h) $(symfile_h) $(target_h) $(gdb_string_h) $(regcache_h)

287
gdb/macrocmd.c Normal file
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/* 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.",
&macrolist, "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.",
&macrolist);
add_alias_cmd ("exp", "expand", no_class, 1, &macrolist);
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.",
&macrolist);
add_alias_cmd ("exp1", "expand-once", no_class, 1, &macrolist);
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))",
&macrolist);
add_cmd
("undef", no_class, macro_undef_command,
"Remove the definition of the C/C++ preprocessor macro with the"
" given name.",
&macrolist);
add_cmd
("list", no_class, macro_list_command,
"List all the macros defined using the `macro define' command.",
&macrolist);
user_macros = new_macro_table (0, 0);
}

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gdb/macroscope.c Normal file
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/* Functions for deciding which macros are currently in scope.
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 "macroscope.h"
#include "symtab.h"
#include "target.h"
#include "frame.h"
#include "inferior.h"
struct macro_scope *
sal_macro_scope (struct symtab_and_line sal)
{
struct macro_source_file *main;
struct macro_scope *ms;
if (! sal.symtab
|| ! sal.symtab->macro_table)
return 0;
ms = (struct macro_scope *) xmalloc (sizeof (*ms));
main = macro_main (sal.symtab->macro_table);
ms->file = macro_lookup_inclusion (main, sal.symtab->filename);
if (! ms->file)
internal_error
(__FILE__, __LINE__,
"\n"
"the symtab `%s' refers to a preprocessor macro table which doesn't\n"
"have any record of processing a file by that name.\n",
sal.symtab->filename);
ms->line = sal.line;
return ms;
}
struct macro_scope *
default_macro_scope ()
{
struct symtab_and_line sal;
struct macro_source_file *main;
struct macro_scope *ms;
/* If there's a selected frame, use its PC. */
if (selected_frame)
sal = find_pc_line (selected_frame->pc, 0);
/* If the target has any registers at all, then use its PC. Why we
would have registers but no stack, I'm not sure. */
else if (target_has_registers)
sal = find_pc_line (read_pc (), 0);
/* If all else fails, fall back to the current listing position. */
else
{
/* Don't call select_source_symtab here. That can raise an
error if symbols aren't loaded, but GDB calls the expression
evaluator in all sorts of contexts.
For example, commands like `set width' call the expression
evaluator to evaluate their numeric arguments. If the
current language is C, then that may call this function to
choose a scope for macro expansion. If you don't have any
symbol files loaded, then select_source_symtab will raise an
error. But `set width' shouldn't raise an error just because
it can't decide which scope to macro-expand its argument in. */
sal.symtab = current_source_symtab;
sal.line = current_source_line;
}
return sal_macro_scope (sal);
}
/* Look up the definition of the macro named NAME in scope at the source
location given by BATON, which must be a pointer to a `struct
macro_scope' structure. */
struct macro_definition *
standard_macro_lookup (const char *name, void *baton)
{
struct macro_scope *ms = (struct macro_scope *) baton;
return macro_lookup_definition (ms->file, ms->line, name);
}

63
gdb/macroscope.h Normal file
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/* Interface to functions for deciding which macros are currently in scope.
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. */
#ifndef MACROSCOPE_H
#define MACROSCOPE_H
#include "macrotab.h"
#include "symtab.h"
/* All the information we need to decide which macro definitions are
in scope: a source file (either a main source file or an
#inclusion), and a line number in that file. */
struct macro_scope {
struct macro_source_file *file;
int line;
};
/* Return a `struct macro_scope' object corresponding to the symtab
and line given in SAL. If we have no macro information for that
location, or if SAL's pc is zero, return zero. */
struct macro_scope *sal_macro_scope (struct symtab_and_line sal);
/* Return a `struct macro_scope' object describing the scope the `macro
expand' and `macro expand-once' commands should use for looking up
macros. If we have a selected frame, this is the source location of
its PC; otherwise, this is the last listing position.
If we have no macro information for the current location, return zero.
The object returned is allocated using xmalloc; the caller is
responsible for freeing it. */
struct macro_scope *default_macro_scope (void);
/* Look up the definition of the macro named NAME in scope at the source
location given by BATON, which must be a pointer to a `struct
macro_scope' structure. This function is suitable for use as
a macro_lookup_ftype function. */
struct macro_definition *standard_macro_lookup (const char *name, void *baton);
#endif /* MACROSCOPE_H */