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. */
22 #include "gansidecl.h"
26 int brace_nesting
= 0;
28 /* The first extern_C_braces_length elements of extern_C_braces
29 indicate the (brace nesting levels of) left braces that were
30 prefixed by extern "C". */
31 int extern_C_braces_length
= 0;
32 char extern_C_braces
[20];
33 #define in_extern_C_brace (extern_C_braces_length>0)
35 /* True if the function declaration currently being scanned is
36 prefixed by extern "C". */
37 int current_extern_C
= 0;
40 skip_to_closing_brace (pfile
)
46 enum cpp_token token
= cpp_get_token (pfile
);
49 if (token
== CPP_LBRACE
)
51 if (token
== CPP_RBRACE
&& --nesting
== 0)
56 /* This function scans a C source file (actually, the output of cpp),
57 reading from FP. It looks for function declarations, and
58 external variable declarations.
60 The following grammar (as well as some extra stuff) is recognized:
63 (decl-specifier)* declarator ("," declarator)* ";"
69 (ptr-operator)* dname [ "(" argument-declaration-list ")" ]
71 ("*" | "&") ("const" | "volatile")*
75 Here dname is the actual name being declared.
79 scan_decls (pfile
, argc
, argv
)
84 int saw_extern
, saw_inline
;
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
88 decl-specs, or prev_id_start marks the start of the declarator. */
90 int prev_id_start
, prev_id_end
;
94 CPP_SET_WRITTEN (pfile
, 0);
96 token
= cpp_get_token (pfile
);
102 if (token
== CPP_RBRACE
)
104 /* Pop an 'extern "C"' nesting level, if appropriate. */
105 if (extern_C_braces_length
106 && extern_C_braces
[extern_C_braces_length
- 1] == brace_nesting
)
107 extern_C_braces_length
--;
111 if (token
== CPP_LBRACE
)
116 if (token
== CPP_EOF
)
118 if (token
== CPP_SEMICOLON
)
120 if (token
!= CPP_NAME
)
124 declarator_start
= 0;
130 /* Looks like this is the start of a formal parameter list. */
134 int have_arg_list
= 0;
135 cpp_buffer
*fbuf
= cpp_file_buffer (pfile
);
137 cpp_buf_line_and_col (fbuf
, &func_lineno
, NULL
);
140 token
= cpp_get_token (pfile
);
141 if (token
== CPP_LPAREN
)
143 else if (token
== CPP_RPAREN
)
149 else if (token
== CPP_EOF
)
151 else if (token
== CPP_NAME
|| token
== CPP_3DOTS
)
154 recognized_function (pfile
->token_buffer
+ prev_id_start
,
155 prev_id_end
- prev_id_start
,
157 : in_extern_C_brace
|| current_extern_C
159 pfile
->token_buffer
, prev_id_start
,
161 fbuf
->nominal_fname
, func_lineno
);
162 token
= cpp_get_non_space_token (pfile
);
163 if (token
== CPP_LBRACE
)
165 /* skip body of (normally) inline function */
166 skip_to_closing_brace (pfile
);
169 goto maybe_handle_comma
;
173 if (CPP_WRITTEN (pfile
) == start_written
+ 1
174 && (CPP_PWRITTEN (pfile
)[-1] == '*'
175 || CPP_PWRITTEN (pfile
)[-1] == '&'))
176 declarator_start
= start_written
;
178 goto handle_statement
;
182 if (prev_id_start
&& saw_extern
)
184 recognized_extern (pfile
->token_buffer
+ prev_id_start
,
185 prev_id_end
- prev_id_start
,
189 /* ... fall through ... */
191 if (token
!= CPP_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
);
201 /* "inline" and "extern" are recognized but skipped */
202 if (strcmp (pfile
->token_buffer
, "inline") == 0)
205 CPP_SET_WRITTEN (pfile
, start_written
);
207 if (strcmp (pfile
->token_buffer
, "extern") == 0)
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)
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
)
221 extern_C_braces
[extern_C_braces_length
++]
230 /* This may be the name of a variable or function. */
231 prev_id_start
= start_written
;
232 prev_id_end
= CPP_WRITTEN (pfile
);
238 case CPP_LBRACE
: case CPP_RBRACE
: case CPP_DIRECTIVE
:
239 goto new_statement
; /* handle_statement? */
241 case CPP_HSPACE
: case CPP_VSPACE
: case CPP_COMMENT
: case CPP_POP
:
242 /* Skip initial white space. */
243 if (start_written
== 0)
244 CPP_SET_WRITTEN (pfile
, 0);
251 start_written
= CPP_WRITTEN (pfile
);
252 token
= cpp_get_token (pfile
);