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comparison libiberty/simple-object-common.h @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
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children 04ced10e8804
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67:f6334be47118 68:561a7518be6b
1 /* simple-object-common.h -- common structs for object file manipulation.
2 Copyright (C) 2010 Free Software Foundation, Inc.
3
4 This file is part of the libiberty library.
5 Libiberty is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 Libiberty 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 GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with libiberty; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA. */
19
20 /* Forward reference. */
21 struct simple_object_functions;
22
23 /* An object file opened for reading. */
24
25 struct simple_object_read_struct
26 {
27 /* The file descriptor. */
28 int descriptor;
29 /* The offset within the file. */
30 off_t offset;
31 /* The functions which do the actual work. */
32 const struct simple_object_functions *functions;
33 /* Private data for the object file format. */
34 void *data;
35 };
36
37 /* Object file attributes. */
38
39 struct simple_object_attributes_struct
40 {
41 /* The functions which do the actual work. */
42 const struct simple_object_functions *functions;
43 /* Private data for the object file format. */
44 void *data;
45 };
46
47 /* An object file being created. */
48
49 struct simple_object_write_struct
50 {
51 /* The functions which do the actual work. */
52 const struct simple_object_functions *functions;
53 /* The segment_name argument from the user. */
54 char *segment_name;
55 /* The start of the list of sections. */
56 simple_object_write_section *sections;
57 /* The last entry in the list of sections. */
58 simple_object_write_section *last_section;
59 /* Private data for the object file format. */
60 void *data;
61 };
62
63 /* A section in an object file being created. */
64
65 struct simple_object_write_section_struct
66 {
67 /* Next in the list of sections attached to an
68 simple_object_write. */
69 simple_object_write_section *next;
70 /* The name of this section. */
71 char *name;
72 /* The required alignment. */
73 unsigned int align;
74 /* The first data attached to this section. */
75 struct simple_object_write_section_buffer *buffers;
76 /* The last data attached to this section. */
77 struct simple_object_write_section_buffer *last_buffer;
78 };
79
80 /* Data attached to a section. */
81
82 struct simple_object_write_section_buffer
83 {
84 /* The next data for this section. */
85 struct simple_object_write_section_buffer *next;
86 /* The size of the buffer. */
87 size_t size;
88 /* The actual bytes. */
89 const void *buffer;
90 /* A buffer to free, or NULL. */
91 void *free_buffer;
92 };
93
94 /* The number of bytes we read from the start of the file to pass to
95 the match function. */
96 #define SIMPLE_OBJECT_MATCH_HEADER_LEN (16)
97
98 /* Format-specific object file functions. */
99
100 struct simple_object_functions
101 {
102 /* If this file matches these functions, return a new value for the
103 private data for an simple_object_read. HEADER is the first 16
104 bytes of the file. DESCRIPTOR, OFFSET, SEGMENT_NAME, ERRMSG, and
105 ERR are as for simple_object_open_read. If this file does not
106 match, this function should return NULL with *ERRMSG set to
107 NULL. */
108 void *(*match) (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
109 int descriptor, off_t offset, const char *segment_name,
110 const char **errmsg, int *err);
111
112 /* Implement simple_object_find_sections. */
113 const char *(*find_sections) (simple_object_read *,
114 int (*pfn) (void *, const char *,
115 off_t offset, off_t length),
116 void *data,
117 int *err);
118
119 /* Return the private data for the attributes for SOBJ. */
120 void *(*fetch_attributes) (simple_object_read *sobj, const char **errmsg,
121 int *err);
122
123 /* Release the private data for an simple_object_read. */
124 void (*release_read) (void *);
125
126 /* Merge the private data for the attributes of two files. If they
127 could be linked together, return NULL. Otherwise return an error
128 message. */
129 const char *(*attributes_merge) (void *, void *, int *err);
130
131 /* Release the private data for an simple_object_attributes. */
132 void (*release_attributes) (void *);
133
134 /* Start creating an object file. */
135 void *(*start_write) (void *attributes_data, const char **errmsg,
136 int *err);
137
138 /* Write the complete object file. */
139 const char *(*write_to_file) (simple_object_write *sobj, int descriptor,
140 int *err);
141
142 /* Release the private data for an simple_object_write. */
143 void (*release_write) (void *);
144 };
145
146 /* The known object file formats. */
147
148 extern const struct simple_object_functions simple_object_coff_functions;
149 extern const struct simple_object_functions simple_object_elf_functions;
150 extern const struct simple_object_functions simple_object_mach_o_functions;
151
152 /* Read SIZE bytes from DESCRIPTOR at file offset OFFSET into BUFFER.
153 Return non-zero on success. On failure return 0 and set *ERRMSG
154 and *ERR. */
155
156 extern int
157 simple_object_internal_read (int descriptor, off_t offset,
158 unsigned char *buffer, size_t size,
159 const char **errmsg, int *err);
160
161 /* Write SIZE bytes from BUFFER to DESCRIPTOR at file offset OFFSET.
162 Return non-zero on success. On failure return 0 and set *ERRMSG
163 and *ERR. */
164
165 extern int
166 simple_object_internal_write (int descriptor, off_t offset,
167 const unsigned char *buffer, size_t size,
168 const char **errmsg, int *err);
169
170 /* Define ulong_type as an unsigned 64-bit type if available.
171 Otherwise just make it unsigned long. */
172
173 #ifdef UNSIGNED_64BIT_TYPE
174 __extension__ typedef UNSIGNED_64BIT_TYPE ulong_type;
175 #else
176 typedef unsigned long ulong_type;
177 #endif
178
179 /* Fetch a big-endian 16-bit value. */
180
181 static inline unsigned short
182 simple_object_fetch_big_16 (const unsigned char *buf)
183 {
184 return ((unsigned short) buf[0] << 8) | (unsigned short) buf[1];
185 }
186
187 /* Fetch a little-endian 16-bit value. */
188
189 static inline unsigned short
190 simple_object_fetch_little_16 (const unsigned char *buf)
191 {
192 return ((unsigned short) buf[1] << 8) | (unsigned short) buf[0];
193 }
194
195 /* Fetch a big-endian 32-bit value. */
196
197 static inline unsigned int
198 simple_object_fetch_big_32 (const unsigned char *buf)
199 {
200 return (((unsigned int) buf[0] << 24)
201 | ((unsigned int) buf[1] << 16)
202 | ((unsigned int) buf[2] << 8)
203 | (unsigned int) buf[3]);
204 }
205
206 /* Fetch a little-endian 32-bit value. */
207
208 static inline unsigned int
209 simple_object_fetch_little_32 (const unsigned char *buf)
210 {
211 return (((unsigned int) buf[3] << 24)
212 | ((unsigned int) buf[2] << 16)
213 | ((unsigned int) buf[1] << 8)
214 | (unsigned int) buf[0]);
215 }
216
217 /* Fetch a big-endian 32-bit value as a ulong_type. */
218
219 static inline ulong_type
220 simple_object_fetch_big_32_ulong (const unsigned char *buf)
221 {
222 return (ulong_type) simple_object_fetch_big_32 (buf);
223 }
224
225 /* Fetch a little-endian 32-bit value as a ulong_type. */
226
227 static inline ulong_type
228 simple_object_fetch_little_32_ulong (const unsigned char *buf)
229 {
230 return (ulong_type) simple_object_fetch_little_32 (buf);
231 }
232
233 #ifdef UNSIGNED_64BIT_TYPE
234
235 /* Fetch a big-endian 64-bit value. */
236
237 static inline ulong_type
238 simple_object_fetch_big_64 (const unsigned char *buf)
239 {
240 return (((ulong_type) buf[0] << 56)
241 | ((ulong_type) buf[1] << 48)
242 | ((ulong_type) buf[2] << 40)
243 | ((ulong_type) buf[3] << 32)
244 | ((ulong_type) buf[4] << 24)
245 | ((ulong_type) buf[5] << 16)
246 | ((ulong_type) buf[6] << 8)
247 | (ulong_type) buf[7]);
248 }
249
250 /* Fetch a little-endian 64-bit value. */
251
252 static inline ulong_type
253 simple_object_fetch_little_64 (const unsigned char *buf)
254 {
255 return (((ulong_type) buf[7] << 56)
256 | ((ulong_type) buf[6] << 48)
257 | ((ulong_type) buf[5] << 40)
258 | ((ulong_type) buf[4] << 32)
259 | ((ulong_type) buf[3] << 24)
260 | ((ulong_type) buf[2] << 16)
261 | ((ulong_type) buf[1] << 8)
262 | (ulong_type) buf[0]);
263 }
264
265 #endif
266
267 /* Store a big-endian 16-bit value. */
268
269 static inline void
270 simple_object_set_big_16 (unsigned char *buf, unsigned short val)
271 {
272 buf[0] = (val >> 8) & 0xff;
273 buf[1] = val & 0xff;
274 }
275
276 /* Store a little-endian 16-bit value. */
277
278 static inline void
279 simple_object_set_little_16 (unsigned char *buf, unsigned short val)
280 {
281 buf[1] = (val >> 8) & 0xff;
282 buf[0] = val & 0xff;
283 }
284
285 /* Store a big-endian 32-bit value. */
286
287 static inline void
288 simple_object_set_big_32 (unsigned char *buf, unsigned int val)
289 {
290 buf[0] = (val >> 24) & 0xff;
291 buf[1] = (val >> 16) & 0xff;
292 buf[2] = (val >> 8) & 0xff;
293 buf[3] = val & 0xff;
294 }
295
296 /* Store a little-endian 32-bit value. */
297
298 static inline void
299 simple_object_set_little_32 (unsigned char *buf, unsigned int val)
300 {
301 buf[3] = (val >> 24) & 0xff;
302 buf[2] = (val >> 16) & 0xff;
303 buf[1] = (val >> 8) & 0xff;
304 buf[0] = val & 0xff;
305 }
306
307 /* Store a big-endian 32-bit value coming in as a ulong_type. */
308
309 static inline void
310 simple_object_set_big_32_ulong (unsigned char *buf, ulong_type val)
311 {
312 simple_object_set_big_32 (buf, val);
313 }
314
315 /* Store a little-endian 32-bit value coming in as a ulong_type. */
316
317 static inline void
318 simple_object_set_little_32_ulong (unsigned char *buf, ulong_type val)
319 {
320 simple_object_set_little_32 (buf, val);
321 }
322
323 #ifdef UNSIGNED_64BIT_TYPE
324
325 /* Store a big-endian 64-bit value. */
326
327 static inline void
328 simple_object_set_big_64 (unsigned char *buf, ulong_type val)
329 {
330 buf[0] = (val >> 56) & 0xff;
331 buf[1] = (val >> 48) & 0xff;
332 buf[2] = (val >> 40) & 0xff;
333 buf[3] = (val >> 32) & 0xff;
334 buf[4] = (val >> 24) & 0xff;
335 buf[5] = (val >> 16) & 0xff;
336 buf[6] = (val >> 8) & 0xff;
337 buf[7] = val & 0xff;
338 }
339
340 /* Store a little-endian 64-bit value. */
341
342 static inline void
343 simple_object_set_little_64 (unsigned char *buf, ulong_type val)
344 {
345 buf[7] = (val >> 56) & 0xff;
346 buf[6] = (val >> 48) & 0xff;
347 buf[5] = (val >> 40) & 0xff;
348 buf[4] = (val >> 32) & 0xff;
349 buf[3] = (val >> 24) & 0xff;
350 buf[2] = (val >> 16) & 0xff;
351 buf[1] = (val >> 8) & 0xff;
352 buf[0] = val & 0xff;
353 }
354
355 #endif