| /* Functions for deciding which macros are currently in scope. |
| Copyright (C) 2002, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| |
| #include "macroscope.h" |
| #include "symtab.h" |
| #include "source.h" |
| #include "target.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "complaints.h" |
| |
| |
| struct macro_scope * |
| sal_macro_scope (struct symtab_and_line sal) |
| { |
| struct macro_source_file *main_file, *inclusion; |
| struct macro_scope *ms; |
| |
| if (! sal.symtab |
| || ! sal.symtab->macro_table) |
| return 0; |
| |
| ms = (struct macro_scope *) xmalloc (sizeof (*ms)); |
| |
| main_file = macro_main (sal.symtab->macro_table); |
| inclusion = macro_lookup_inclusion (main_file, sal.symtab->filename); |
| |
| if (inclusion) |
| { |
| ms->file = inclusion; |
| ms->line = sal.line; |
| } |
| else |
| { |
| /* There are, unfortunately, cases where a compilation unit can |
| have a symtab for a source file that doesn't appear in the |
| macro table. For example, at the moment, Dwarf doesn't have |
| any way in the .debug_macinfo section to describe the effect |
| of #line directives, so if you debug a YACC parser you'll get |
| a macro table which only mentions the .c files generated by |
| YACC, but symtabs that mention the .y files consumed by YACC. |
| |
| In the long run, we should extend the Dwarf macro info |
| representation to handle #line directives, and get GCC to |
| emit it. |
| |
| For the time being, though, we'll just treat these as |
| occurring at the end of the main source file. */ |
| ms->file = main_file; |
| ms->line = -1; |
| |
| complaint (&symfile_complaints, |
| _("symtab found for `%s', but that file\n" |
| "is not covered in the compilation unit's macro information"), |
| sal.symtab->filename); |
| } |
| |
| return ms; |
| } |
| |
| |
| struct macro_scope * |
| default_macro_scope (void) |
| { |
| struct symtab_and_line sal; |
| struct macro_scope *ms; |
| struct frame_info *frame; |
| |
| /* If there's a selected frame, use its PC. */ |
| frame = deprecated_safe_get_selected_frame (); |
| if (frame) |
| sal = find_pc_line (get_frame_pc (frame), 0); |
| |
| /* 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); |
| } |