1 /* Functions for deciding which macros are currently in scope.
2 Copyright (C) 2002-2018 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"
30 /* A table of user-defined macros. Unlike the macro tables used for
31 symtabs, this one uses xmalloc for all its allocation, not an
32 obstack, and it doesn't bcache anything; it just xmallocs things. So
33 it's perfectly possible to remove things from this, or redefine
35 struct macro_table
*macro_user_macros
;
39 sal_macro_scope (struct symtab_and_line sal
)
41 struct macro_source_file
*main_file
, *inclusion
;
42 struct macro_scope
*ms
;
43 struct compunit_symtab
*cust
;
45 if (sal
.symtab
== NULL
)
47 cust
= SYMTAB_COMPUNIT (sal
.symtab
);
48 if (COMPUNIT_MACRO_TABLE (cust
) == NULL
)
51 ms
= XNEW (struct macro_scope
);
53 main_file
= macro_main (COMPUNIT_MACRO_TABLE (cust
));
54 inclusion
= macro_lookup_inclusion (main_file
, sal
.symtab
->filename
);
63 /* There are, unfortunately, cases where a compilation unit can
64 have a symtab for a source file that doesn't appear in the
65 macro table. For example, at the moment, Dwarf doesn't have
66 any way in the .debug_macinfo section to describe the effect
67 of #line directives, so if you debug a YACC parser you'll get
68 a macro table which only mentions the .c files generated by
69 YACC, but symtabs that mention the .y files consumed by YACC.
71 In the long run, we should extend the Dwarf macro info
72 representation to handle #line directives, and get GCC to
75 For the time being, though, we'll just treat these as
76 occurring at the end of the main source file. */
80 complaint (&symfile_complaints
,
81 _("symtab found for `%s', but that file\n"
82 "is not covered in the compilation unit's macro information"),
83 symtab_to_filename_for_display (sal
.symtab
));
91 user_macro_scope (void)
93 struct macro_scope
*ms
;
95 ms
= XNEW (struct macro_scope
);
96 ms
->file
= macro_main (macro_user_macros
);
102 default_macro_scope (void)
104 struct symtab_and_line sal
;
105 struct macro_scope
*ms
;
106 struct frame_info
*frame
;
109 /* If there's a selected frame, use its PC. */
110 frame
= deprecated_safe_get_selected_frame ();
111 if (frame
&& get_frame_pc_if_available (frame
, &pc
))
112 sal
= find_pc_line (pc
, 0);
114 /* Fall back to the current listing position. */
117 /* Don't call select_source_symtab here. That can raise an
118 error if symbols aren't loaded, but GDB calls the expression
119 evaluator in all sorts of contexts.
121 For example, commands like `set width' call the expression
122 evaluator to evaluate their numeric arguments. If the
123 current language is C, then that may call this function to
124 choose a scope for macro expansion. If you don't have any
125 symbol files loaded, then get_current_or_default would raise an
126 error. But `set width' shouldn't raise an error just because
127 it can't decide which scope to macro-expand its argument in. */
128 struct symtab_and_line cursal
=
129 get_current_source_symtab_and_line ();
131 sal
.symtab
= cursal
.symtab
;
132 sal
.line
= cursal
.line
;
135 ms
= sal_macro_scope (sal
);
137 ms
= user_macro_scope ();
143 /* Look up the definition of the macro named NAME in scope at the source
144 location given by BATON, which must be a pointer to a `struct
145 macro_scope' structure. */
146 struct macro_definition
*
147 standard_macro_lookup (const char *name
, void *baton
)
149 struct macro_scope
*ms
= (struct macro_scope
*) baton
;
150 struct macro_definition
*result
;
152 /* Give user-defined macros priority over all others. */
153 result
= macro_lookup_definition (macro_main (macro_user_macros
), -1, name
);
155 result
= macro_lookup_definition (ms
->file
, ms
->line
, name
);
160 _initialize_macroscope (void)
162 macro_user_macros
= new_macro_table (NULL
, NULL
, NULL
);
163 macro_set_main (macro_user_macros
, "<user-defined>");
164 macro_allow_redefinitions (macro_user_macros
);
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