1 /* Functions for deciding which macros are currently in scope.
2 Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.
3 Contributed by Red Hat, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "macroscope.h"
28 #include "complaints.h"
32 sal_macro_scope (struct symtab_and_line sal
)
34 struct macro_source_file
*main_file
, *inclusion
;
35 struct macro_scope
*ms
;
38 || ! sal
.symtab
->macro_table
)
41 ms
= (struct macro_scope
*) xmalloc (sizeof (*ms
));
43 main_file
= macro_main (sal
.symtab
->macro_table
);
44 inclusion
= macro_lookup_inclusion (main_file
, sal
.symtab
->filename
);
53 /* There are, unfortunately, cases where a compilation unit can
54 have a symtab for a source file that doesn't appear in the
55 macro table. For example, at the moment, Dwarf doesn't have
56 any way in the .debug_macinfo section to describe the effect
57 of #line directives, so if you debug a YACC parser you'll get
58 a macro table which only mentions the .c files generated by
59 YACC, but symtabs that mention the .y files consumed by YACC.
61 In the long run, we should extend the Dwarf macro info
62 representation to handle #line directives, and get GCC to
65 For the time being, though, we'll just treat these as
66 occurring at the end of the main source file. */
70 complaint (&symfile_complaints
,
71 _("symtab found for `%s', but that file\n"
72 "is not covered in the compilation unit's macro information"),
73 sal
.symtab
->filename
);
81 default_macro_scope (void)
83 struct symtab_and_line sal
;
84 struct macro_scope
*ms
;
85 struct frame_info
*frame
;
87 /* If there's a selected frame, use its PC. */
88 frame
= deprecated_safe_get_selected_frame ();
90 sal
= find_pc_line (get_frame_pc (frame
), 0);
92 /* Fall back to the current listing position. */
95 /* Don't call select_source_symtab here. That can raise an
96 error if symbols aren't loaded, but GDB calls the expression
97 evaluator in all sorts of contexts.
99 For example, commands like `set width' call the expression
100 evaluator to evaluate their numeric arguments. If the
101 current language is C, then that may call this function to
102 choose a scope for macro expansion. If you don't have any
103 symbol files loaded, then get_current_or_default would raise an
104 error. But `set width' shouldn't raise an error just because
105 it can't decide which scope to macro-expand its argument in. */
106 struct symtab_and_line cursal
=
107 get_current_source_symtab_and_line ();
109 sal
.symtab
= cursal
.symtab
;
110 sal
.line
= cursal
.line
;
113 return sal_macro_scope (sal
);
117 /* Look up the definition of the macro named NAME in scope at the source
118 location given by BATON, which must be a pointer to a `struct
119 macro_scope' structure. */
120 struct macro_definition
*
121 standard_macro_lookup (const char *name
, void *baton
)
123 struct macro_scope
*ms
= (struct macro_scope
*) baton
;
125 return macro_lookup_definition (ms
->file
, ms
->line
, name
);
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