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git.ipfire.org Git - thirdparty/gcc.git/blob - gcc/scan-decls.c
1 /* scan-decls.c - Extracts declarations from cpp output.
2 Copyright (C) 1993, 1995, 1997, 1998 Free Software Foundation, Inc.
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
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.
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
16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 Written by Per Bothner <bothner@cygnus.com>, July 1993. */
25 int brace_nesting
= 0;
27 /* The first extern_C_braces_length elements of extern_C_braces
28 indicate the (brace nesting levels of) left braces that were
29 prefixed by extern "C". */
30 int extern_C_braces_length
= 0;
31 char extern_C_braces
[20];
32 #define in_extern_C_brace (extern_C_braces_length>0)
34 /* True if the function declaration currently being scanned is
35 prefixed by extern "C". */
36 int current_extern_C
= 0;
39 skip_to_closing_brace (pfile
)
45 enum cpp_token token
= cpp_get_token (pfile
);
48 if (token
== CPP_LBRACE
)
50 if (token
== CPP_RBRACE
&& --nesting
== 0)
55 /* This function scans a C source file (actually, the output of cpp),
56 reading from FP. It looks for function declarations, and
57 external variable declarations.
59 The following grammar (as well as some extra stuff) is recognized:
62 (decl-specifier)* declarator ("," declarator)* ";"
68 (ptr-operator)* dname [ "(" argument-declaration-list ")" ]
70 ("*" | "&") ("const" | "volatile")*
74 Here dname is the actual name being declared.
78 scan_decls (pfile
, argc
, argv
)
83 int saw_extern
, saw_inline
;
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
87 decl-specs, or prev_id_start marks the start of the declarator. */
89 int prev_id_start
, prev_id_end
;
93 CPP_SET_WRITTEN (pfile
, 0);
95 token
= cpp_get_token (pfile
);
101 if (token
== CPP_RBRACE
)
103 /* Pop an 'extern "C"' nesting level, if appropriate. */
104 if (extern_C_braces_length
105 && extern_C_braces
[extern_C_braces_length
- 1] == brace_nesting
)
106 extern_C_braces_length
--;
110 if (token
== CPP_LBRACE
)
115 if (token
== CPP_EOF
)
117 if (token
== CPP_SEMICOLON
)
119 if (token
!= CPP_NAME
)
123 declarator_start
= 0;
129 /* Looks like this is the start of a formal parameter list. */
133 int have_arg_list
= 0;
134 cpp_buffer
*fbuf
= cpp_file_buffer (pfile
);
136 cpp_buf_line_and_col (fbuf
, &func_lineno
, NULL
);
139 token
= cpp_get_token (pfile
);
140 if (token
== CPP_LPAREN
)
142 else if (token
== CPP_RPAREN
)
148 else if (token
== CPP_EOF
)
150 else if (token
== CPP_NAME
|| token
== CPP_3DOTS
)
153 recognized_function (pfile
->token_buffer
+ prev_id_start
,
154 prev_id_end
- prev_id_start
,
156 : in_extern_C_brace
|| current_extern_C
158 pfile
->token_buffer
, prev_id_start
,
160 fbuf
->nominal_fname
, func_lineno
);
161 token
= cpp_get_non_space_token (pfile
);
162 if (token
== CPP_LBRACE
)
164 /* skip body of (normally) inline function */
165 skip_to_closing_brace (pfile
);
168 goto maybe_handle_comma
;
172 if (CPP_WRITTEN (pfile
) == start_written
+ 1
173 && (CPP_PWRITTEN (pfile
)[-1] == '*'
174 || CPP_PWRITTEN (pfile
)[-1] == '&'))
175 declarator_start
= start_written
;
177 goto handle_statement
;
181 if (prev_id_start
&& saw_extern
)
183 recognized_extern (pfile
->token_buffer
+ prev_id_start
,
184 prev_id_end
- prev_id_start
,
188 /* ... fall through ... */
190 if (token
!= CPP_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
);
200 /* "inline" and "extern" are recognized but skipped */
201 if (strcmp (pfile
->token_buffer
, "inline") == 0)
204 CPP_SET_WRITTEN (pfile
, start_written
);
206 if (strcmp (pfile
->token_buffer
, "extern") == 0)
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)
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
)
220 extern_C_braces
[extern_C_braces_length
++]
229 /* This may be the name of a variable or function. */
230 prev_id_start
= start_written
;
231 prev_id_end
= CPP_WRITTEN (pfile
);
237 case CPP_LBRACE
: case CPP_RBRACE
: case CPP_DIRECTIVE
:
238 goto new_statement
; /* handle_statement? */
240 case CPP_HSPACE
: case CPP_VSPACE
: case CPP_COMMENT
: case CPP_POP
:
241 /* Skip initial white space. */
242 if (start_written
== 0)
243 CPP_SET_WRITTEN (pfile
, 0);
250 start_written
= CPP_WRITTEN (pfile
);
251 token
= cpp_get_token (pfile
);