1 | /* Specific flags and argument handling of the C preprocessor. |
2 | Copyright (C) 1999-2023 Free Software Foundation, Inc. |
3 | |
4 | This file is part of GCC. |
5 | |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free |
8 | Software Foundation; either version 3, or (at your option) any later |
9 | version. |
10 | |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
14 | for more details. |
15 | |
16 | You should have received a copy of the GNU General Public License |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include "config.h" |
21 | #include "system.h" |
22 | #include "coretypes.h" |
23 | #include "tm.h" |
24 | #include "opt-suggestions.h" |
25 | #include "gcc.h" |
26 | #include "opts.h" |
27 | |
28 | /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir) |
29 | is a customized version of the gcc driver. It forces -E; -S and -c |
30 | are errors. It defaults to -x c for files with unrecognized |
31 | extensions, unless -x options appear in argv, in which case we |
32 | assume the user knows what they're doing. If no explicit input is |
33 | mentioned, it will read stdin. */ |
34 | |
35 | /* Suffixes for known sorts of input files. Note that we do not list |
36 | files which are normally considered to have been preprocessed already, |
37 | since the user's expectation is that `cpp' always preprocesses. */ |
38 | static const char *const known_suffixes[] = |
39 | { |
40 | ".c" , ".C" , ".S" , ".m" , |
41 | ".cc" , ".cxx" , ".cpp" , ".cp" , ".c++" , |
42 | ".sx" , |
43 | NULL |
44 | }; |
45 | |
46 | /* Filter the command line before processing by the gcc driver proper. */ |
47 | void |
48 | lang_specific_driver (struct cl_decoded_option **in_decoded_options, |
49 | unsigned int *in_decoded_options_count, |
50 | int *in_added_libraries ATTRIBUTE_UNUSED) |
51 | { |
52 | struct cl_decoded_option *decoded_options = *in_decoded_options; |
53 | unsigned int argc = *in_decoded_options_count; |
54 | |
55 | /* Do we need to read stdin? */ |
56 | int read_stdin = 1; |
57 | |
58 | /* Do we need to insert -E? */ |
59 | int need_E = 1; |
60 | |
61 | /* Have we seen an input file? */ |
62 | int seen_input = 0; |
63 | |
64 | /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary. |
65 | 0 means unnecessary. */ |
66 | unsigned int lang_c_here = 0; |
67 | unsigned int lang_S_here = 0; |
68 | unsigned int o_here = 0; |
69 | |
70 | /* Do we need to fix up an input file with an unrecognized suffix? */ |
71 | int need_fixups = 1; |
72 | |
73 | unsigned int i, j; |
74 | struct cl_decoded_option *new_decoded_options; |
75 | unsigned int new_argc; |
76 | extern int is_cpp_driver; |
77 | |
78 | is_cpp_driver = 1; |
79 | |
80 | /* First pass. If we see an -S or -c, barf. If we see an input file, |
81 | turn off read_stdin. If we see a second input file, it is actually |
82 | the output file. If we see a third input file, barf. */ |
83 | for (i = 1; i < argc; i++) |
84 | { |
85 | switch (decoded_options[i].opt_index) |
86 | { |
87 | case OPT_E: |
88 | need_E = 0; |
89 | break; |
90 | |
91 | case OPT_S: |
92 | case OPT_c: |
93 | fatal_error (input_location, |
94 | "%qs is not a valid option to the preprocessor" , |
95 | decoded_options[i].orig_option_with_args_text); |
96 | return; |
97 | |
98 | case OPT_x: |
99 | need_fixups = 0; |
100 | break; |
101 | |
102 | case OPT_SPECIAL_input_file: |
103 | { |
104 | const char *file = decoded_options[i].arg; |
105 | |
106 | if (strcmp (s1: file, s2: "-" ) == 0) |
107 | read_stdin = 0; |
108 | else |
109 | { |
110 | seen_input++; |
111 | if (seen_input == 3) |
112 | { |
113 | fatal_error (input_location, "too many input files" ); |
114 | return; |
115 | } |
116 | else if (seen_input == 2) |
117 | { |
118 | o_here = i; |
119 | } |
120 | else |
121 | { |
122 | read_stdin = 0; |
123 | if (need_fixups) |
124 | { |
125 | int l = strlen (s: file); |
126 | int known = 0; |
127 | const char *const *suff; |
128 | |
129 | for (suff = known_suffixes; *suff; suff++) |
130 | if (!strcmp (s1: *suff, s2: &file[l - strlen(s: *suff)])) |
131 | { |
132 | known = 1; |
133 | break; |
134 | } |
135 | |
136 | if (! known) |
137 | { |
138 | /* .s files are a special case; we have to |
139 | treat them like .S files so |
140 | -D__ASSEMBLER__ will be in effect. */ |
141 | if (!strcmp (s1: ".s" , s2: &file[l - 2])) |
142 | lang_S_here = i; |
143 | else |
144 | lang_c_here = i; |
145 | } |
146 | } |
147 | } |
148 | } |
149 | } |
150 | break; |
151 | } |
152 | } |
153 | |
154 | /* If we don't need to edit the command line, we can bail early. */ |
155 | |
156 | new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here; |
157 | |
158 | if (new_argc == argc && !o_here) |
159 | return; |
160 | |
161 | new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc); |
162 | |
163 | new_decoded_options[0] = decoded_options[0]; |
164 | j = 1; |
165 | |
166 | if (need_E) |
167 | generate_option (opt_index: OPT_E, NULL, value: 1, CL_DRIVER, decoded: &new_decoded_options[j++]); |
168 | |
169 | for (i = 1; i < argc; i++, j++) |
170 | { |
171 | if (i == lang_c_here) |
172 | generate_option (opt_index: OPT_x, arg: "c" , value: 1, CL_DRIVER, decoded: &new_decoded_options[j++]); |
173 | else if (i == lang_S_here) |
174 | generate_option (opt_index: OPT_x, arg: "assembler-with-cpp" , value: 1, CL_DRIVER, |
175 | decoded: &new_decoded_options[j++]); |
176 | else if (i == o_here) |
177 | { |
178 | generate_option (opt_index: OPT_o, arg: decoded_options[i].arg, value: 1, CL_DRIVER, |
179 | decoded: &new_decoded_options[j]); |
180 | continue; |
181 | } |
182 | |
183 | new_decoded_options[j] = decoded_options[i]; |
184 | } |
185 | |
186 | if (read_stdin) |
187 | generate_option_input_file (file: "-" , decoded: &new_decoded_options[j++]); |
188 | |
189 | *in_decoded_options_count = new_argc; |
190 | *in_decoded_options = new_decoded_options; |
191 | } |
192 | |
193 | /* Called before linking. Returns 0 on success and -1 on failure. */ |
194 | int lang_specific_pre_link (void) |
195 | { |
196 | return 0; /* Not used for cpp. */ |
197 | } |
198 | |
199 | /* Number of extra output files that lang_specific_pre_link may generate. */ |
200 | int = 0; /* Not used for cpp. */ |
201 | |