1 /* Precompiled header implementation for the C languages.
2 Copyright (C) 2000, 2002 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 #include "coretypes.h"
33 #include "langhooks.h"
37 unsigned char debug_info_type
;
42 unsigned long asm_size
;
45 #define IDENT_LENGTH 8
47 static FILE *pch_outfile
;
49 static long asm_file_startpos
;
51 static const char * get_ident
PARAMS((void));
53 /* Compute an appropriate 8-byte magic number for the PCH file, so that
54 utilities like file(1) can identify it, and so that GCC can quickly
55 ignore non-PCH files and PCH files that are of a completely different
61 static char result
[IDENT_LENGTH
];
62 static const char template[IDENT_LENGTH
] = "gpch.011";
64 memcpy (result
, template, IDENT_LENGTH
);
65 if (c_language
== clk_c
)
66 result
[4] = flag_objc
? 'o' : 'C';
67 else if (c_language
== clk_cplusplus
)
68 result
[4] = flag_objc
? 'O' : '+';
74 /* Prepare to write a PCH file. This is called at the start of
81 struct c_pch_validity v
;
86 f
= fopen (pch_file
, "w+b");
88 fatal_error ("can't open %s: %m", pch_file
);
91 v
.debug_info_type
= write_symbols
;
92 if (fwrite (get_ident(), IDENT_LENGTH
, 1, f
) != 1
93 || fwrite (&v
, sizeof (v
), 1, f
) != 1)
94 fatal_error ("can't write to %s: %m", pch_file
);
96 /* We need to be able to re-read the output. */
97 /* The driver always provides a valid -o option. */
98 if (asm_file_name
== NULL
99 || strcmp (asm_file_name
, "-") == 0)
100 fatal_error ("`%s' is not a valid output file", asm_file_name
);
102 asm_file_startpos
= ftell (asm_out_file
);
104 /* Let the debugging format deal with the PCHness. */
105 (*debug_hooks
->handle_pch
) (0);
107 cpp_save_state (parse_in
, f
);
110 /* Write the PCH file. This is called at the end of a compilation which
111 will produce a PCH file. */
114 c_common_write_pch ()
119 struct c_pch_header h
;
121 (*debug_hooks
->handle_pch
) (1);
123 cpp_write_pch_deps (parse_in
, pch_outfile
);
125 asm_file_end
= ftell (asm_out_file
);
126 h
.asm_size
= asm_file_end
- asm_file_startpos
;
128 if (fwrite (&h
, sizeof (h
), 1, pch_outfile
) != 1)
129 fatal_error ("can't write %s: %m", pch_file
);
131 buf
= xmalloc (16384);
132 fflush (asm_out_file
);
134 if (fseek (asm_out_file
, asm_file_startpos
, SEEK_SET
) != 0)
135 fatal_error ("can't seek in %s: %m", asm_file_name
);
137 for (written
= asm_file_startpos
; written
< asm_file_end
; )
139 long size
= asm_file_end
- written
;
142 if (fread (buf
, size
, 1, asm_out_file
) != 1)
143 fatal_error ("can't read %s: %m", asm_file_name
);
144 if (fwrite (buf
, size
, 1, pch_outfile
) != 1)
145 fatal_error ("can't write %s: %m", pch_file
);
150 gt_pch_save (pch_outfile
);
151 cpp_write_pch_state (parse_in
, pch_outfile
);
153 fclose (pch_outfile
);
156 /* Check the PCH file called NAME, open on FD, to see if it can be used
157 in this compilation. */
160 c_common_valid_pch (pfile
, name
, fd
)
167 char ident
[IDENT_LENGTH
];
168 const char *pch_ident
;
169 struct c_pch_validity v
;
174 /* Perform a quick test of whether this is a valid
175 precompiled header for the current language. */
177 sizeread
= read (fd
, ident
, IDENT_LENGTH
);
179 fatal_error ("can't read %s: %m", name
);
180 else if (sizeread
!= IDENT_LENGTH
)
183 pch_ident
= get_ident();
184 if (memcmp (ident
, pch_ident
, IDENT_LENGTH
) != 0)
186 if (cpp_get_options (pfile
)->warn_invalid_pch
)
188 if (memcmp (ident
, pch_ident
, 5) == 0)
189 /* It's a PCH, for the right language, but has the wrong version.
191 cpp_error (pfile
, DL_WARNING
,
192 "%s: not compatible with this GCC version", name
);
193 else if (memcmp (ident
, pch_ident
, 4) == 0)
194 /* It's a PCH for the wrong language. */
195 cpp_error (pfile
, DL_WARNING
, "%s: not for %s", name
,
198 /* Not any kind of PCH. */
199 cpp_error (pfile
, DL_WARNING
, "%s: not a PCH file", name
);
204 if (read (fd
, &v
, sizeof (v
)) != sizeof (v
))
205 fatal_error ("can't read %s: %m", name
);
207 /* The allowable debug info combinations are that either the PCH file
208 was built with the same as is being used now, or the PCH file was
209 built for some kind of debug info but now none is in use. */
210 if (v
.debug_info_type
!= write_symbols
211 && write_symbols
!= NO_DEBUG
)
213 if (cpp_get_options (pfile
)->warn_invalid_pch
)
214 cpp_error (pfile
, DL_WARNING
,
215 "%s: created with -g%s, but used with -g%s", name
,
216 debug_type_names
[v
.debug_info_type
],
217 debug_type_names
[write_symbols
]);
221 /* Check the preprocessor macros are the same as when the PCH was
224 result
= cpp_valid_state (pfile
, name
, fd
);
231 /* Load in the PCH file NAME, open on FD. It was originally searched for
235 c_common_read_pch (pfile
, name
, fd
, orig_name
)
239 const char *orig_name ATTRIBUTE_UNUSED
;
242 struct c_pch_header h
;
244 unsigned long written
;
245 struct save_macro_data
*smd
;
247 f
= fdopen (fd
, "rb");
250 cpp_errno (pfile
, DL_ERROR
, "calling fdopen");
256 if (fread (&h
, sizeof (h
), 1, f
) != 1)
258 cpp_errno (pfile
, DL_ERROR
, "reading");
262 buf
= xmalloc (16384);
263 for (written
= 0; written
< h
.asm_size
; )
265 long size
= h
.asm_size
- written
;
268 if (fread (buf
, size
, 1, f
) != 1
269 || fwrite (buf
, size
, 1, asm_out_file
) != 1)
270 cpp_errno (pfile
, DL_ERROR
, "reading");
275 cpp_prepare_state (pfile
, &smd
);
279 if (cpp_read_state (pfile
, name
, f
, smd
) != 0)