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7936052f | 1 | /* scan-decls.c - Extracts declarations from cpp output. |
081f5e7e | 2 | Copyright (C) 1993, 1995, 1997, 1998 Free Software Foundation, Inc. |
7936052f PB |
3 | |
4 | This program is free software; you can redistribute it and/or modify it | |
5 | under the terms of the GNU General Public License as published by the | |
6 | Free Software Foundation; either version 2, or (at your option) any | |
7 | later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
95d83698 | 16 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
7936052f | 17 | |
ba7ff9f9 | 18 | Written by Per Bothner <bothner@cygnus.com>, July 1993. */ |
7936052f | 19 | |
ffde73b0 | 20 | #include "hconfig.h" |
b04cd507 | 21 | #include "system.h" |
b3ca463c | 22 | #include "cpplib.h" |
d6f4ec51 | 23 | #include "scan.h" |
7936052f PB |
24 | |
25 | int brace_nesting = 0; | |
26 | ||
27 | /* The first extern_C_braces_length elements of extern_C_braces | |
28 | indicate the (brace nesting levels of) left braces that were | |
e174accc | 29 | prefixed by extern "C". */ |
7936052f PB |
30 | int extern_C_braces_length = 0; |
31 | char extern_C_braces[20]; | |
32 | #define in_extern_C_brace (extern_C_braces_length>0) | |
33 | ||
34 | /* True if the function declaration currently being scanned is | |
e174accc | 35 | prefixed by extern "C". */ |
7936052f PB |
36 | int current_extern_C = 0; |
37 | ||
e9cd0b25 | 38 | static void |
b3ca463c PB |
39 | skip_to_closing_brace (pfile) |
40 | cpp_reader *pfile; | |
e9cd0b25 PB |
41 | { |
42 | int nesting = 1; | |
43 | for (;;) | |
44 | { | |
b3ca463c PB |
45 | enum cpp_token token = cpp_get_token (pfile); |
46 | if (token == CPP_EOF) | |
e9cd0b25 | 47 | break; |
b3ca463c | 48 | if (token == CPP_LBRACE) |
e9cd0b25 | 49 | nesting++; |
b3ca463c | 50 | if (token == CPP_RBRACE && --nesting == 0) |
e9cd0b25 PB |
51 | break; |
52 | } | |
53 | } | |
54 | ||
ba7ff9f9 | 55 | /* This function scans a C source file (actually, the output of cpp), |
7a208c0b RK |
56 | reading from FP. It looks for function declarations, and |
57 | external variable declarations. | |
58 | ||
59 | The following grammar (as well as some extra stuff) is recognized: | |
60 | ||
61 | declaration: | |
62 | (decl-specifier)* declarator ("," declarator)* ";" | |
63 | decl-specifier: | |
64 | identifier | |
65 | keyword | |
66 | extern "C" | |
67 | declarator: | |
68 | (ptr-operator)* dname [ "(" argument-declaration-list ")" ] | |
69 | ptr-operator: | |
70 | ("*" | "&") ("const" | "volatile")* | |
71 | dname: | |
72 | identifier | |
73 | ||
74 | Here dname is the actual name being declared. | |
75 | */ | |
ba7ff9f9 | 76 | |
7936052f | 77 | int |
b3ca463c PB |
78 | scan_decls (pfile, argc, argv) |
79 | cpp_reader *pfile; | |
80 | int argc; | |
0f41302f | 81 | char **argv; |
7936052f | 82 | { |
e9cd0b25 | 83 | int saw_extern, saw_inline; |
1d300e19 | 84 | int start_written; |
7a208c0b RK |
85 | /* If declarator_start is non-zero, it marks the start of the current |
86 | declarator. If it is zero, we are either still parsing the | |
0f41302f | 87 | decl-specs, or prev_id_start marks the start of the declarator. */ |
7a208c0b | 88 | int declarator_start; |
b3ca463c PB |
89 | int prev_id_start, prev_id_end; |
90 | enum cpp_token token; | |
91 | ||
7936052f | 92 | new_statement: |
b3ca463c | 93 | CPP_SET_WRITTEN (pfile, 0); |
1d300e19 | 94 | start_written = 0; |
b3ca463c PB |
95 | token = cpp_get_token (pfile); |
96 | ||
7936052f PB |
97 | handle_statement: |
98 | current_extern_C = 0; | |
99 | saw_extern = 0; | |
e9cd0b25 | 100 | saw_inline = 0; |
b3ca463c | 101 | if (token == CPP_RBRACE) |
7936052f | 102 | { |
e174accc | 103 | /* Pop an 'extern "C"' nesting level, if appropriate. */ |
7936052f PB |
104 | if (extern_C_braces_length |
105 | && extern_C_braces[extern_C_braces_length - 1] == brace_nesting) | |
106 | extern_C_braces_length--; | |
107 | brace_nesting--; | |
108 | goto new_statement; | |
109 | } | |
b3ca463c | 110 | if (token == CPP_LBRACE) |
7936052f PB |
111 | { |
112 | brace_nesting++; | |
113 | goto new_statement; | |
114 | } | |
b3ca463c | 115 | if (token == CPP_EOF) |
7936052f | 116 | return 0; |
b3ca463c | 117 | if (token == CPP_SEMICOLON) |
7936052f | 118 | goto new_statement; |
b3ca463c | 119 | if (token != CPP_NAME) |
7936052f | 120 | goto new_statement; |
7a208c0b RK |
121 | |
122 | prev_id_start = 0; | |
123 | declarator_start = 0; | |
7936052f PB |
124 | for (;;) |
125 | { | |
b3ca463c | 126 | switch (token) |
7936052f | 127 | { |
b3ca463c | 128 | case CPP_LPAREN: |
0f41302f | 129 | /* Looks like this is the start of a formal parameter list. */ |
b3ca463c | 130 | if (prev_id_start) |
7936052f PB |
131 | { |
132 | int nesting = 1; | |
b3ca463c PB |
133 | int have_arg_list = 0; |
134 | cpp_buffer *fbuf = cpp_file_buffer (pfile); | |
135 | long func_lineno; | |
136 | cpp_buf_line_and_col (fbuf, &func_lineno, NULL); | |
7936052f PB |
137 | for (;;) |
138 | { | |
b3ca463c PB |
139 | token = cpp_get_token (pfile); |
140 | if (token == CPP_LPAREN) | |
7936052f | 141 | nesting++; |
b3ca463c | 142 | else if (token == CPP_RPAREN) |
e174accc | 143 | { |
b3ca463c PB |
144 | nesting--; |
145 | if (nesting == 0) | |
146 | break; | |
e174accc | 147 | } |
b3ca463c PB |
148 | else if (token == CPP_EOF) |
149 | break; | |
150 | else if (token == CPP_NAME || token == CPP_3DOTS) | |
151 | have_arg_list = 1; | |
7936052f | 152 | } |
b3ca463c PB |
153 | recognized_function (pfile->token_buffer + prev_id_start, |
154 | prev_id_end - prev_id_start, | |
e174accc RS |
155 | (saw_inline ? 'I' |
156 | : in_extern_C_brace || current_extern_C | |
157 | ? 'F' : 'f'), | |
b3ca463c PB |
158 | pfile->token_buffer, prev_id_start, |
159 | have_arg_list, | |
160 | fbuf->nominal_fname, func_lineno); | |
161 | token = cpp_get_non_space_token (pfile); | |
162 | if (token == CPP_LBRACE) | |
e9cd0b25 PB |
163 | { |
164 | /* skip body of (normally) inline function */ | |
b3ca463c | 165 | skip_to_closing_brace (pfile); |
e9cd0b25 PB |
166 | goto new_statement; |
167 | } | |
7a208c0b | 168 | goto maybe_handle_comma; |
7936052f | 169 | } |
b3ca463c | 170 | break; |
7a208c0b RK |
171 | case CPP_OTHER: |
172 | if (CPP_WRITTEN (pfile) == start_written + 1 | |
173 | && (CPP_PWRITTEN (pfile)[-1] == '*' | |
174 | || CPP_PWRITTEN (pfile)[-1] == '&')) | |
175 | declarator_start = start_written; | |
176 | else | |
177 | goto handle_statement; | |
178 | break; | |
179 | case CPP_COMMA: | |
b3ca463c PB |
180 | case CPP_SEMICOLON: |
181 | if (prev_id_start && saw_extern) | |
7936052f | 182 | { |
b3ca463c PB |
183 | recognized_extern (pfile->token_buffer + prev_id_start, |
184 | prev_id_end - prev_id_start, | |
185 | pfile->token_buffer, | |
186 | prev_id_start); | |
7936052f | 187 | } |
0f41302f | 188 | /* ... fall through ... */ |
7a208c0b RK |
189 | maybe_handle_comma: |
190 | if (token != CPP_COMMA) | |
191 | goto new_statement; | |
192 | handle_comma: | |
193 | /* Handle multiple declarators in a single declaration, | |
194 | as in: extern char *strcpy (), *strcat (), ... ; */ | |
195 | if (declarator_start == 0) | |
196 | declarator_start = prev_id_start; | |
197 | CPP_SET_WRITTEN (pfile, declarator_start); | |
198 | break; | |
b3ca463c | 199 | case CPP_NAME: |
7a208c0b RK |
200 | /* "inline" and "extern" are recognized but skipped */ |
201 | if (strcmp (pfile->token_buffer, "inline") == 0) | |
202 | { | |
203 | saw_inline = 1; | |
204 | CPP_SET_WRITTEN (pfile, start_written); | |
205 | } | |
206 | if (strcmp (pfile->token_buffer, "extern") == 0) | |
207 | { | |
208 | saw_extern = 1; | |
209 | CPP_SET_WRITTEN (pfile, start_written); | |
210 | token = cpp_get_non_space_token (pfile); | |
211 | if (token == CPP_STRING | |
212 | && strcmp (pfile->token_buffer, "\"C\"") == 0) | |
213 | { | |
214 | CPP_SET_WRITTEN (pfile, start_written); | |
215 | current_extern_C = 1; | |
216 | token = cpp_get_non_space_token (pfile); | |
217 | if (token == CPP_LBRACE) | |
218 | { | |
219 | brace_nesting++; | |
220 | extern_C_braces[extern_C_braces_length++] | |
221 | = brace_nesting; | |
222 | goto new_statement; | |
223 | } | |
224 | } | |
225 | else | |
1d300e19 | 226 | continue; |
7a208c0b RK |
227 | break; |
228 | } | |
0f41302f | 229 | /* This may be the name of a variable or function. */ |
b3ca463c PB |
230 | prev_id_start = start_written; |
231 | prev_id_end = CPP_WRITTEN (pfile); | |
232 | break; | |
233 | ||
234 | case CPP_EOF: | |
1d300e19 | 235 | return 0; |
b3ca463c PB |
236 | |
237 | case CPP_LBRACE: case CPP_RBRACE: case CPP_DIRECTIVE: | |
238 | goto new_statement; /* handle_statement? */ | |
239 | ||
240 | case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT: case CPP_POP: | |
0f41302f | 241 | /* Skip initial white space. */ |
7a208c0b RK |
242 | if (start_written == 0) |
243 | CPP_SET_WRITTEN (pfile, 0); | |
b3ca463c PB |
244 | break; |
245 | ||
246 | default: | |
7b15e61e | 247 | prev_id_start = 0; |
7936052f | 248 | } |
1d300e19 KG |
249 | |
250 | start_written = CPP_WRITTEN (pfile); | |
251 | token = cpp_get_token (pfile); | |
7936052f PB |
252 | } |
253 | } |