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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [macroscope.c] - Blame information for rev 258

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1 24 jeremybenn
/* Functions for deciding which macros are currently in scope.
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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 "macroscope.h"
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#include "symtab.h"
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#include "source.h"
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#include "target.h"
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#include "frame.h"
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#include "inferior.h"
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#include "complaints.h"
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struct macro_scope *
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sal_macro_scope (struct symtab_and_line sal)
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{
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  struct macro_source_file *main_file, *inclusion;
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  struct macro_scope *ms;
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  if (! sal.symtab
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      || ! sal.symtab->macro_table)
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    return 0;
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  ms = (struct macro_scope *) xmalloc (sizeof (*ms));
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  main_file = macro_main (sal.symtab->macro_table);
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  inclusion = macro_lookup_inclusion (main_file, sal.symtab->filename);
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  if (inclusion)
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    {
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      ms->file = inclusion;
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      ms->line = sal.line;
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    }
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  else
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    {
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      /* There are, unfortunately, cases where a compilation unit can
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         have a symtab for a source file that doesn't appear in the
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         macro table.  For example, at the moment, Dwarf doesn't have
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         any way in the .debug_macinfo section to describe the effect
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         of #line directives, so if you debug a YACC parser you'll get
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         a macro table which only mentions the .c files generated by
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         YACC, but symtabs that mention the .y files consumed by YACC.
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         In the long run, we should extend the Dwarf macro info
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         representation to handle #line directives, and get GCC to
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         emit it.
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         For the time being, though, we'll just treat these as
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         occurring at the end of the main source file.  */
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      ms->file = main_file;
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      ms->line = -1;
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      complaint (&symfile_complaints,
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                 _("symtab found for `%s', but that file\n"
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                 "is not covered in the compilation unit's macro information"),
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                 sal.symtab->filename);
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    }
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  return ms;
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}
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struct macro_scope *
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default_macro_scope (void)
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{
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  struct symtab_and_line sal;
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  struct macro_scope *ms;
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  struct frame_info *frame;
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  /* If there's a selected frame, use its PC.  */
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  frame = deprecated_safe_get_selected_frame ();
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  if (frame)
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    sal = find_pc_line (get_frame_pc (frame), 0);
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  /* Fall back to the current listing position.  */
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  else
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    {
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      /* Don't call select_source_symtab here.  That can raise an
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         error if symbols aren't loaded, but GDB calls the expression
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         evaluator in all sorts of contexts.
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         For example, commands like `set width' call the expression
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         evaluator to evaluate their numeric arguments.  If the
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         current language is C, then that may call this function to
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         choose a scope for macro expansion.  If you don't have any
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         symbol files loaded, then get_current_or_default would raise an
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         error.  But `set width' shouldn't raise an error just because
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         it can't decide which scope to macro-expand its argument in.  */
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      struct symtab_and_line cursal =
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                        get_current_source_symtab_and_line ();
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      sal.symtab = cursal.symtab;
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      sal.line = cursal.line;
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    }
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  return sal_macro_scope (sal);
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}
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/* Look up the definition of the macro named NAME in scope at the source
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   location given by BATON, which must be a pointer to a `struct
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   macro_scope' structure.  */
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struct macro_definition *
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standard_macro_lookup (const char *name, void *baton)
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{
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  struct macro_scope *ms = (struct macro_scope *) baton;
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  return macro_lookup_definition (ms->file, ms->line, name);
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}

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