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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 "source.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 (void)
{
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 get_current_or_default would 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. */
struct symtab_and_line cursal =
get_current_source_symtab_and_line ();
sal.symtab = cursal.symtab;
sal.line = cursal.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);
}
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