1 /* scan-decls.c - Extracts declarations from cpp output.
2 Copyright (C) 1993, 1995, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 Written by Per Bothner <bothner@cygnus.com>, July 1993. */
26 static void skip_to_closing_brace PARAMS ((cpp_reader *));
28 int brace_nesting = 0;
30 /* The first extern_C_braces_length elements of extern_C_braces
31 indicate the (brace nesting levels of) left braces that were
32 prefixed by extern "C". */
33 int extern_C_braces_length = 0;
34 char extern_C_braces[20];
35 #define in_extern_C_brace (extern_C_braces_length>0)
37 /* True if the function declaration currently being scanned is
38 prefixed by extern "C". */
39 int current_extern_C = 0;
42 skip_to_closing_brace (pfile)
48 enum cpp_ttype token = cpp_get_token (pfile);
51 if (token == CPP_OPEN_BRACE)
53 if (token == CPP_CLOSE_BRACE && --nesting == 0)
58 /* This function scans a C source file (actually, the output of cpp),
59 reading from FP. It looks for function declarations, and
60 external variable declarations.
62 The following grammar (as well as some extra stuff) is recognized:
65 (decl-specifier)* declarator ("," declarator)* ";"
71 (ptr-operator)* dname [ "(" argument-declaration-list ")" ]
73 ("*" | "&") ("const" | "volatile")*
77 Here dname is the actual name being declared.
81 scan_decls (pfile, argc, argv)
83 int argc ATTRIBUTE_UNUSED;
84 char **argv ATTRIBUTE_UNUSED;
86 int saw_extern, saw_inline;
88 /* If declarator_start is non-zero, it marks the start of the current
89 declarator. If it is zero, we are either still parsing the
90 decl-specs, or prev_id_start marks the start of the declarator. */
92 int prev_id_start, prev_id_end = 0;
96 CPP_SET_WRITTEN (pfile, 0);
98 token = cpp_get_token (pfile);
101 current_extern_C = 0;
104 if (token == CPP_OPEN_BRACE)
106 /* Pop an 'extern "C"' nesting level, if appropriate. */
107 if (extern_C_braces_length
108 && extern_C_braces[extern_C_braces_length - 1] == brace_nesting)
109 extern_C_braces_length--;
113 if (token == CPP_OPEN_BRACE)
118 if (token == CPP_EOF)
120 if (CPP_BUFFER (pfile) == NULL)
125 if (token == CPP_SEMICOLON)
127 if (token != CPP_NAME)
131 declarator_start = 0;
137 /* Looks like this is the start of a formal parameter list. */
141 int have_arg_list = 0;
142 cpp_buffer *fbuf = cpp_file_buffer (pfile);
143 unsigned int func_lineno = CPP_BUF_LINE (fbuf);
146 token = cpp_get_token (pfile);
147 if (token == CPP_OPEN_PAREN)
149 else if (token == CPP_CLOSE_PAREN)
155 else if (token == CPP_EOF)
157 else if (token == CPP_NAME || token == CPP_ELLIPSIS)
160 recognized_function (pfile->token_buffer + prev_id_start,
161 prev_id_end - prev_id_start,
163 : in_extern_C_brace || current_extern_C
165 pfile->token_buffer, prev_id_start,
167 fbuf->nominal_fname, func_lineno);
168 token = cpp_get_non_space_token (pfile);
169 if (token == CPP_OPEN_BRACE)
171 /* skip body of (normally) inline function */
172 skip_to_closing_brace (pfile);
175 goto maybe_handle_comma;
179 if (CPP_WRITTEN (pfile) == (size_t) start_written + 1
180 && (CPP_PWRITTEN (pfile)[-1] == '*'
181 || CPP_PWRITTEN (pfile)[-1] == '&'))
182 declarator_start = start_written;
184 goto handle_statement;
188 if (prev_id_start && saw_extern)
190 recognized_extern (pfile->token_buffer + prev_id_start,
191 prev_id_end - prev_id_start,
195 /* ... fall through ... */
197 if (token != CPP_COMMA)
200 /* Handle multiple declarators in a single declaration,
201 as in: extern char *strcpy (), *strcat (), ... ; */
202 if (declarator_start == 0)
203 declarator_start = prev_id_start;
204 CPP_SET_WRITTEN (pfile, declarator_start);
207 /* "inline" and "extern" are recognized but skipped */
208 if (!cpp_idcmp (pfile->token_buffer,
209 CPP_WRITTEN (pfile), "inline"))
212 CPP_SET_WRITTEN (pfile, start_written);
214 else if (!cpp_idcmp (pfile->token_buffer,
215 CPP_WRITTEN (pfile), "extern"))
218 CPP_SET_WRITTEN (pfile, start_written);
219 token = cpp_get_non_space_token (pfile);
220 if (token == CPP_STRING
221 && strcmp (pfile->token_buffer, "\"C\"") == 0)
223 CPP_SET_WRITTEN (pfile, start_written);
224 current_extern_C = 1;
225 token = cpp_get_non_space_token (pfile);
226 if (token == CPP_OPEN_BRACE)
229 extern_C_braces[extern_C_braces_length++]
238 /* This may be the name of a variable or function. */
239 prev_id_start = start_written;
240 prev_id_end = CPP_WRITTEN (pfile);
243 case CPP_OPEN_BRACE: case CPP_CLOSE_BRACE: case CPP_DIRECTIVE:
244 goto new_statement; /* handle_statement? */
247 if (CPP_BUFFER (pfile) == NULL)
249 /* else fall through */
251 case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT:
252 /* Skip initial white space. */
253 if (start_written == 0)
254 CPP_SET_WRITTEN (pfile, 0);
261 start_written = CPP_WRITTEN (pfile);
262 token = cpp_get_token (pfile);