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)
51 cpp_get_token (pfile, &tok);
55 if (token == CPP_OPEN_BRACE)
57 if (token == CPP_CLOSE_BRACE && --nesting == 0)
62 /* This function scans a C source file (actually, the output of cpp),
63 reading from FP. It looks for function declarations, and
64 external variable declarations.
66 The following grammar (as well as some extra stuff) is recognized:
69 (decl-specifier)* declarator ("," declarator)* ";"
75 (ptr-operator)* dname [ "(" argument-declaration-list ")" ]
77 ("*" | "&") ("const" | "volatile")*
81 Here dname is the actual name being declared.
85 scan_decls (pfile, argc, argv)
87 int argc ATTRIBUTE_UNUSED;
88 char **argv ATTRIBUTE_UNUSED;
90 int saw_extern, saw_inline;
91 cpp_token token, prev_id;
94 cpp_get_token (pfile, &token);
100 if (token.type == CPP_OPEN_BRACE)
102 /* Pop an 'extern "C"' nesting level, if appropriate. */
103 if (extern_C_braces_length
104 && extern_C_braces[extern_C_braces_length - 1] == brace_nesting)
105 extern_C_braces_length--;
109 if (token.type == CPP_OPEN_BRACE)
114 if (token.type == CPP_EOF)
116 cpp_pop_buffer (pfile);
117 if (CPP_BUFFER (pfile) == NULL)
122 if (token.type == CPP_SEMICOLON)
124 if (token.type != CPP_NAME)
127 prev_id.type = CPP_EOF;
133 goto handle_statement;
136 case CPP_PLACEMARKER:
142 if (prev_id.type != CPP_EOF && saw_extern)
144 recognized_extern (&prev_id);
146 if (token.type == CPP_COMMA)
148 /* ... fall through ... */
149 case CPP_OPEN_BRACE: case CPP_CLOSE_BRACE:
153 cpp_pop_buffer (pfile);
154 if (CPP_BUFFER (pfile) == NULL)
159 /* Looks like this is the start of a formal parameter list. */
160 if (prev_id.type != CPP_EOF)
163 int have_arg_list = 0;
166 cpp_get_token (pfile, &token);
167 if (token.type == CPP_OPEN_PAREN)
169 else if (token.type == CPP_CLOSE_PAREN)
175 else if (token.type == CPP_EOF)
177 else if (token.type == CPP_NAME
178 || token.type == CPP_ELLIPSIS)
181 recognized_function (&prev_id,
182 cpp_get_line (pfile)->line,
184 : in_extern_C_brace || current_extern_C
185 ? 'F' : 'f'), have_arg_list,
186 CPP_BUFFER (pfile)->nominal_fname);
187 cpp_get_token (pfile, &token);
188 if (token.type == CPP_OPEN_BRACE)
190 /* skip body of (normally) inline function */
191 skip_to_closing_brace (pfile);
194 if (token.type == CPP_SEMICOLON)
199 /* "inline" and "extern" are recognized but skipped */
200 if (cpp_ideq (&token, "inline"))
204 else if (cpp_ideq (&token, "extern"))
207 cpp_get_token (pfile, &token);
208 if (token.type == CPP_STRING
209 && token.val.str.len == 1
210 && token.val.str.text[0] == 'C')
212 current_extern_C = 1;
213 cpp_get_token (pfile, &token);
214 if (token.type == CPP_OPEN_BRACE)
217 extern_C_braces[extern_C_braces_length++]
226 /* This may be the name of a variable or function. */
230 cpp_get_token (pfile, &token);