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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" |
487a6e06 | 22 | #include "gansidecl.h" |
b3ca463c | 23 | #include "cpplib.h" |
d6f4ec51 | 24 | #include "scan.h" |
7936052f PB |
25 | |
26 | int brace_nesting = 0; | |
27 | ||
28 | /* The first extern_C_braces_length elements of extern_C_braces | |
29 | indicate the (brace nesting levels of) left braces that were | |
e174accc | 30 | prefixed by extern "C". */ |
7936052f PB |
31 | int extern_C_braces_length = 0; |
32 | char extern_C_braces[20]; | |
33 | #define in_extern_C_brace (extern_C_braces_length>0) | |
34 | ||
35 | /* True if the function declaration currently being scanned is | |
e174accc | 36 | prefixed by extern "C". */ |
7936052f PB |
37 | int current_extern_C = 0; |
38 | ||
e9cd0b25 | 39 | static void |
b3ca463c PB |
40 | skip_to_closing_brace (pfile) |
41 | cpp_reader *pfile; | |
e9cd0b25 PB |
42 | { |
43 | int nesting = 1; | |
44 | for (;;) | |
45 | { | |
b3ca463c PB |
46 | enum cpp_token token = cpp_get_token (pfile); |
47 | if (token == CPP_EOF) | |
e9cd0b25 | 48 | break; |
b3ca463c | 49 | if (token == CPP_LBRACE) |
e9cd0b25 | 50 | nesting++; |
b3ca463c | 51 | if (token == CPP_RBRACE && --nesting == 0) |
e9cd0b25 PB |
52 | break; |
53 | } | |
54 | } | |
55 | ||
ba7ff9f9 | 56 | /* This function scans a C source file (actually, the output of cpp), |
7a208c0b RK |
57 | reading from FP. It looks for function declarations, and |
58 | external variable declarations. | |
59 | ||
60 | The following grammar (as well as some extra stuff) is recognized: | |
61 | ||
62 | declaration: | |
63 | (decl-specifier)* declarator ("," declarator)* ";" | |
64 | decl-specifier: | |
65 | identifier | |
66 | keyword | |
67 | extern "C" | |
68 | declarator: | |
69 | (ptr-operator)* dname [ "(" argument-declaration-list ")" ] | |
70 | ptr-operator: | |
71 | ("*" | "&") ("const" | "volatile")* | |
72 | dname: | |
73 | identifier | |
74 | ||
75 | Here dname is the actual name being declared. | |
76 | */ | |
ba7ff9f9 | 77 | |
7936052f | 78 | int |
b3ca463c PB |
79 | scan_decls (pfile, argc, argv) |
80 | cpp_reader *pfile; | |
81 | int argc; | |
0f41302f | 82 | char **argv; |
7936052f | 83 | { |
e9cd0b25 | 84 | int saw_extern, saw_inline; |
1d300e19 | 85 | int start_written; |
7a208c0b RK |
86 | /* If declarator_start is non-zero, it marks the start of the current |
87 | declarator. If it is zero, we are either still parsing the | |
0f41302f | 88 | decl-specs, or prev_id_start marks the start of the declarator. */ |
7a208c0b | 89 | int declarator_start; |
b3ca463c PB |
90 | int prev_id_start, prev_id_end; |
91 | enum cpp_token token; | |
92 | ||
7936052f | 93 | new_statement: |
b3ca463c | 94 | CPP_SET_WRITTEN (pfile, 0); |
1d300e19 | 95 | start_written = 0; |
b3ca463c PB |
96 | token = cpp_get_token (pfile); |
97 | ||
7936052f PB |
98 | handle_statement: |
99 | current_extern_C = 0; | |
100 | saw_extern = 0; | |
e9cd0b25 | 101 | saw_inline = 0; |
b3ca463c | 102 | if (token == CPP_RBRACE) |
7936052f | 103 | { |
e174accc | 104 | /* Pop an 'extern "C"' nesting level, if appropriate. */ |
7936052f PB |
105 | if (extern_C_braces_length |
106 | && extern_C_braces[extern_C_braces_length - 1] == brace_nesting) | |
107 | extern_C_braces_length--; | |
108 | brace_nesting--; | |
109 | goto new_statement; | |
110 | } | |
b3ca463c | 111 | if (token == CPP_LBRACE) |
7936052f PB |
112 | { |
113 | brace_nesting++; | |
114 | goto new_statement; | |
115 | } | |
b3ca463c | 116 | if (token == CPP_EOF) |
7936052f | 117 | return 0; |
b3ca463c | 118 | if (token == CPP_SEMICOLON) |
7936052f | 119 | goto new_statement; |
b3ca463c | 120 | if (token != CPP_NAME) |
7936052f | 121 | goto new_statement; |
7a208c0b RK |
122 | |
123 | prev_id_start = 0; | |
124 | declarator_start = 0; | |
7936052f PB |
125 | for (;;) |
126 | { | |
b3ca463c | 127 | switch (token) |
7936052f | 128 | { |
b3ca463c | 129 | case CPP_LPAREN: |
0f41302f | 130 | /* Looks like this is the start of a formal parameter list. */ |
b3ca463c | 131 | if (prev_id_start) |
7936052f PB |
132 | { |
133 | int nesting = 1; | |
b3ca463c PB |
134 | int have_arg_list = 0; |
135 | cpp_buffer *fbuf = cpp_file_buffer (pfile); | |
136 | long func_lineno; | |
137 | cpp_buf_line_and_col (fbuf, &func_lineno, NULL); | |
7936052f PB |
138 | for (;;) |
139 | { | |
b3ca463c PB |
140 | token = cpp_get_token (pfile); |
141 | if (token == CPP_LPAREN) | |
7936052f | 142 | nesting++; |
b3ca463c | 143 | else if (token == CPP_RPAREN) |
e174accc | 144 | { |
b3ca463c PB |
145 | nesting--; |
146 | if (nesting == 0) | |
147 | break; | |
e174accc | 148 | } |
b3ca463c PB |
149 | else if (token == CPP_EOF) |
150 | break; | |
151 | else if (token == CPP_NAME || token == CPP_3DOTS) | |
152 | have_arg_list = 1; | |
7936052f | 153 | } |
b3ca463c PB |
154 | recognized_function (pfile->token_buffer + prev_id_start, |
155 | prev_id_end - prev_id_start, | |
e174accc RS |
156 | (saw_inline ? 'I' |
157 | : in_extern_C_brace || current_extern_C | |
158 | ? 'F' : 'f'), | |
b3ca463c PB |
159 | pfile->token_buffer, prev_id_start, |
160 | have_arg_list, | |
161 | fbuf->nominal_fname, func_lineno); | |
162 | token = cpp_get_non_space_token (pfile); | |
163 | if (token == CPP_LBRACE) | |
e9cd0b25 PB |
164 | { |
165 | /* skip body of (normally) inline function */ | |
b3ca463c | 166 | skip_to_closing_brace (pfile); |
e9cd0b25 PB |
167 | goto new_statement; |
168 | } | |
7a208c0b | 169 | goto maybe_handle_comma; |
7936052f | 170 | } |
b3ca463c | 171 | break; |
7a208c0b RK |
172 | case CPP_OTHER: |
173 | if (CPP_WRITTEN (pfile) == start_written + 1 | |
174 | && (CPP_PWRITTEN (pfile)[-1] == '*' | |
175 | || CPP_PWRITTEN (pfile)[-1] == '&')) | |
176 | declarator_start = start_written; | |
177 | else | |
178 | goto handle_statement; | |
179 | break; | |
180 | case CPP_COMMA: | |
b3ca463c PB |
181 | case CPP_SEMICOLON: |
182 | if (prev_id_start && saw_extern) | |
7936052f | 183 | { |
b3ca463c PB |
184 | recognized_extern (pfile->token_buffer + prev_id_start, |
185 | prev_id_end - prev_id_start, | |
186 | pfile->token_buffer, | |
187 | prev_id_start); | |
7936052f | 188 | } |
0f41302f | 189 | /* ... fall through ... */ |
7a208c0b RK |
190 | maybe_handle_comma: |
191 | if (token != CPP_COMMA) | |
192 | goto new_statement; | |
193 | handle_comma: | |
194 | /* Handle multiple declarators in a single declaration, | |
195 | as in: extern char *strcpy (), *strcat (), ... ; */ | |
196 | if (declarator_start == 0) | |
197 | declarator_start = prev_id_start; | |
198 | CPP_SET_WRITTEN (pfile, declarator_start); | |
199 | break; | |
b3ca463c | 200 | case CPP_NAME: |
7a208c0b RK |
201 | /* "inline" and "extern" are recognized but skipped */ |
202 | if (strcmp (pfile->token_buffer, "inline") == 0) | |
203 | { | |
204 | saw_inline = 1; | |
205 | CPP_SET_WRITTEN (pfile, start_written); | |
206 | } | |
207 | if (strcmp (pfile->token_buffer, "extern") == 0) | |
208 | { | |
209 | saw_extern = 1; | |
210 | CPP_SET_WRITTEN (pfile, start_written); | |
211 | token = cpp_get_non_space_token (pfile); | |
212 | if (token == CPP_STRING | |
213 | && strcmp (pfile->token_buffer, "\"C\"") == 0) | |
214 | { | |
215 | CPP_SET_WRITTEN (pfile, start_written); | |
216 | current_extern_C = 1; | |
217 | token = cpp_get_non_space_token (pfile); | |
218 | if (token == CPP_LBRACE) | |
219 | { | |
220 | brace_nesting++; | |
221 | extern_C_braces[extern_C_braces_length++] | |
222 | = brace_nesting; | |
223 | goto new_statement; | |
224 | } | |
225 | } | |
226 | else | |
1d300e19 | 227 | continue; |
7a208c0b RK |
228 | break; |
229 | } | |
0f41302f | 230 | /* This may be the name of a variable or function. */ |
b3ca463c PB |
231 | prev_id_start = start_written; |
232 | prev_id_end = CPP_WRITTEN (pfile); | |
233 | break; | |
234 | ||
235 | case CPP_EOF: | |
1d300e19 | 236 | return 0; |
b3ca463c PB |
237 | |
238 | case CPP_LBRACE: case CPP_RBRACE: case CPP_DIRECTIVE: | |
239 | goto new_statement; /* handle_statement? */ | |
240 | ||
241 | case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT: case CPP_POP: | |
0f41302f | 242 | /* Skip initial white space. */ |
7a208c0b RK |
243 | if (start_written == 0) |
244 | CPP_SET_WRITTEN (pfile, 0); | |
b3ca463c PB |
245 | break; |
246 | ||
247 | default: | |
7b15e61e | 248 | prev_id_start = 0; |
7936052f | 249 | } |
1d300e19 KG |
250 | |
251 | start_written = CPP_WRITTEN (pfile); | |
252 | token = cpp_get_token (pfile); | |
7936052f PB |
253 | } |
254 | } |