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1ab3bf1b JG |
1 | /* GDB routines for manipulating objfiles. |
2 | Copyright 1992 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support, using pieces from other GDB modules. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | /* This file contains support routines for creating, manipulating, and | |
22 | destroying objfile structures. */ | |
23 | ||
24 | #include <stdio.h> | |
25 | #include "defs.h" | |
26 | #include "bfd.h" /* Binary File Description */ | |
27 | #include "symtab.h" | |
28 | #include "symfile.h" | |
29 | ||
30 | #include <obstack.h> | |
31 | ||
32 | /* Externally visible variables that are owned by this module. */ | |
33 | ||
34 | struct objfile *object_files; /* Linked list of all objfiles */ | |
35 | ||
36 | /* Allocate a new objfile struct, fill it in as best we can, and return it. | |
37 | It is also linked into the list of all known object files. */ | |
38 | ||
39 | struct objfile * | |
40 | allocate_objfile (abfd, filename, dumpable) | |
41 | bfd *abfd; | |
42 | char *filename; | |
43 | int dumpable; | |
44 | { | |
45 | struct objfile *objfile; | |
46 | ||
47 | /* First, if the objfile is to be dumpable, we must malloc the structure | |
48 | itself using the mmap version, and arrange that all memory allocation | |
49 | for the objfile uses the mmap routines. Otherwise, just use the | |
50 | old sbrk'd malloc routines. */ | |
51 | ||
52 | if (dumpable) | |
53 | { | |
54 | objfile = (struct objfile *) mmap_xmalloc (sizeof (struct objfile)); | |
55 | (void) memset (objfile, 0, sizeof (struct objfile)); | |
56 | objfile -> malloc = mmap_malloc; | |
57 | objfile -> realloc = mmap_realloc; | |
58 | objfile -> xmalloc = mmap_xmalloc; | |
59 | objfile -> xrealloc = mmap_xrealloc; | |
60 | objfile -> free = mmap_free; | |
61 | objfile -> flags |= OBJF_DUMPABLE; | |
62 | } | |
63 | else | |
64 | { | |
65 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
66 | (void) memset (objfile, 0, sizeof (struct objfile)); | |
67 | objfile -> malloc = malloc; | |
68 | objfile -> realloc = realloc; | |
69 | objfile -> xmalloc = xmalloc; | |
70 | objfile -> xrealloc = xrealloc; | |
71 | objfile -> free = free; | |
72 | } | |
73 | ||
74 | /* Now, malloc a fresh copy of the filename string using the malloc | |
75 | specified as appropriate for the objfile. */ | |
76 | ||
77 | objfile -> name = (*objfile -> xmalloc) (strlen (filename) + 1); | |
78 | strcpy (objfile -> name, filename); | |
79 | ||
80 | objfile -> obfd = abfd; | |
81 | ||
82 | objfile -> mtime = bfd_get_mtime (abfd); | |
83 | ||
84 | /* Set up the various obstacks to use the memory allocation/free | |
85 | functions that are appropriate for this objfile. */ | |
86 | ||
87 | obstack_full_begin (&objfile -> psymbol_obstack, 0, 0, | |
88 | objfile -> xmalloc, objfile -> free); | |
89 | obstack_full_begin (&objfile -> symbol_obstack, 0, 0, | |
90 | objfile -> xmalloc, objfile -> free); | |
91 | obstack_full_begin (&objfile -> type_obstack, 0, 0, | |
92 | objfile -> xmalloc, objfile -> free); | |
93 | ||
94 | /* Push this file onto the head of the linked list of other such files. */ | |
95 | ||
96 | objfile -> next = object_files; | |
97 | object_files = objfile; | |
98 | ||
99 | return (objfile); | |
100 | } | |
101 | ||
102 | ||
103 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
104 | that as much as possible is allocated on the symbol_obstack and | |
105 | psymbol_obstack, so that the memory can be efficiently freed. */ | |
106 | ||
107 | void | |
108 | free_objfile (objfile) | |
109 | struct objfile *objfile; | |
110 | { | |
111 | struct objfile *ofp; | |
112 | ||
113 | if (objfile -> name) | |
114 | { | |
115 | (*objfile -> free) (objfile -> name); | |
116 | } | |
117 | if (objfile -> obfd) | |
118 | { | |
119 | bfd_close (objfile -> obfd); | |
120 | } | |
121 | ||
122 | /* Remove it from the chain of all objfiles. */ | |
123 | ||
124 | if (object_files == objfile) | |
125 | { | |
126 | object_files = objfile -> next; | |
127 | } | |
128 | else | |
129 | { | |
130 | for (ofp = object_files; ofp; ofp = ofp -> next) | |
131 | { | |
132 | if (ofp -> next == objfile) | |
133 | { | |
134 | ofp -> next = objfile -> next; | |
135 | } | |
136 | } | |
137 | } | |
138 | ||
139 | obstack_free (&objfile -> psymbol_obstack, 0); | |
140 | obstack_free (&objfile -> symbol_obstack, 0); | |
141 | obstack_free (&objfile -> type_obstack, 0); | |
142 | ||
143 | #if 0 /* FIXME!! */ | |
144 | ||
145 | /* Before the symbol table code was redone to make it easier to | |
146 | selectively load and remove information particular to a specific | |
147 | linkage unit, gdb used to do these things whenever the monolithic | |
148 | symbol table was blown away. How much still needs to be done | |
149 | is unknown, but we play it safe for now and keep each action until | |
150 | it is shown to be no longer needed. */ | |
151 | ||
152 | clear_symtab_users_once (); | |
153 | #if defined (CLEAR_SOLIB) | |
154 | CLEAR_SOLIB (); | |
155 | #endif | |
156 | clear_pc_function_cache (); | |
157 | ||
158 | #endif | |
159 | ||
160 | /* The last thing we do is free the objfile struct itself, using the | |
161 | free() that is appropriate for the objfile. */ | |
162 | ||
163 | (*objfile -> free) (objfile); | |
164 | } | |
165 | ||
166 | /* Many places in gdb want to test just to see if we have any partial | |
167 | symbols available. This function returns zero if none are currently | |
168 | available, nonzero otherwise. */ | |
169 | ||
170 | int | |
171 | have_partial_symbols () | |
172 | { | |
173 | struct objfile *ofp; | |
174 | int havethem = 0; | |
175 | ||
176 | for (ofp = object_files; ofp; ofp = ofp -> next) | |
177 | { | |
178 | if (ofp -> psymtabs != NULL) | |
179 | { | |
180 | havethem++; | |
181 | break; | |
182 | } | |
183 | } | |
184 | return (havethem); | |
185 | } | |
186 | ||
187 | /* Many places in gdb want to test just to see if we have any full | |
188 | symbols available. This function returns zero if none are currently | |
189 | available, nonzero otherwise. */ | |
190 | ||
191 | int | |
192 | have_full_symbols () | |
193 | { | |
194 | struct objfile *ofp; | |
195 | int havethem = 0; | |
196 | ||
197 | for (ofp = object_files; ofp; ofp = ofp -> next) | |
198 | { | |
199 | if (ofp -> symtabs != NULL) | |
200 | { | |
201 | havethem++; | |
202 | break; | |
203 | } | |
204 | } | |
205 | return (havethem); | |
206 | } | |
207 | ||
208 | /* Many places in gdb want to test just to see if we have any minimal | |
209 | symbols available. This function returns zero if none are currently | |
210 | available, nonzero otherwise. */ | |
211 | ||
212 | int | |
213 | have_minimal_symbols () | |
214 | { | |
215 | struct objfile *ofp; | |
216 | int havethem = 0; | |
217 | ||
218 | for (ofp = object_files; ofp; ofp = ofp -> next) | |
219 | { | |
220 | if (ofp -> msymbols != NULL) | |
221 | { | |
222 | havethem++; | |
223 | break; | |
224 | } | |
225 | } | |
226 | return (havethem); | |
227 | } | |
228 | ||
229 | /* Call the function specified by FUNC for each currently available objfile, | |
230 | for as long as this function continues to return NULL. If the function | |
231 | ever returns non-NULL, then the iteration over the objfiles is terminated, | |
232 | and the result is returned to the caller. The function called has full | |
233 | control over the form and content of the information returned via the | |
234 | non-NULL result, which may be as simple as a pointer to the objfile that | |
235 | the iteration terminated on, or as complex as a pointer to a private | |
236 | structure containing multiple results. */ | |
237 | ||
238 | PTR | |
239 | iterate_over_objfiles (func, arg1, arg2, arg3) | |
240 | PTR (*func) PARAMS ((struct objfile *, PTR, PTR, PTR)); | |
241 | PTR arg1; | |
242 | PTR arg2; | |
243 | PTR arg3; | |
244 | { | |
245 | register struct objfile *objfile; | |
246 | PTR result = NULL; | |
247 | ||
248 | for (objfile = object_files; | |
249 | objfile != NULL && result == NULL; | |
250 | objfile = objfile -> next) | |
251 | { | |
252 | result = (*func)(objfile, arg1, arg2, arg3); | |
253 | } | |
254 | return (result); | |
255 | } | |
256 | ||
257 | /* Call the function specified by FUNC for each currently available symbol | |
258 | table, for as long as this function continues to return NULL. If the | |
259 | function ever returns non-NULL, then the iteration over the symbol tables | |
260 | is terminated, and the result is returned to the caller. The function | |
261 | called has full control over the form and content of the information | |
262 | returned via the non-NULL result, which may be as simple as a pointer | |
263 | to the symtab that the iteration terminated on, or as complex as a | |
264 | pointer to a private structure containing multiple results. */ | |
265 | ||
266 | PTR | |
267 | iterate_over_symtabs (func, arg1, arg2, arg3) | |
268 | PTR (*func) PARAMS ((struct objfile *, struct symtab *, PTR, PTR, PTR)); | |
269 | PTR arg1; | |
270 | PTR arg2; | |
271 | PTR arg3; | |
272 | { | |
273 | register struct objfile *objfile; | |
274 | register struct symtab *symtab; | |
275 | PTR result = NULL; | |
276 | ||
277 | for (objfile = object_files; | |
278 | objfile != NULL && result == NULL; | |
279 | objfile = objfile -> next) | |
280 | { | |
281 | for (symtab = objfile -> symtabs; | |
282 | symtab != NULL && result == NULL; | |
283 | symtab = symtab -> next) | |
284 | { | |
285 | result = (*func)(objfile, symtab, arg1, arg2, arg3); | |
286 | } | |
287 | } | |
288 | return (result); | |
289 | } | |
290 | ||
291 | /* Call the function specified by FUNC for each currently available partial | |
292 | symbol table, for as long as this function continues to return NULL. If | |
293 | the function ever returns non-NULL, then the iteration over the partial | |
294 | symbol tables is terminated, and the result is returned to the caller. | |
295 | ||
296 | The function called has full control over the form and content of the | |
297 | information returned via the non-NULL result, which may be as simple as a | |
298 | pointer to the partial symbol table that the iteration terminated on, or | |
299 | as complex as a pointer to a private structure containing multiple | |
300 | results. */ | |
301 | ||
302 | PTR | |
303 | iterate_over_psymtabs (func, arg1, arg2, arg3) | |
304 | PTR (*func) PARAMS ((struct objfile *, struct partial_symtab *, | |
305 | PTR, PTR, PTR)); | |
306 | PTR arg1; | |
307 | PTR arg2; | |
308 | PTR arg3; | |
309 | { | |
310 | register struct objfile *objfile; | |
311 | register struct partial_symtab *psymtab; | |
312 | PTR result = NULL; | |
313 | ||
314 | for (objfile = object_files; | |
315 | objfile != NULL && result == NULL; | |
316 | objfile = objfile -> next) | |
317 | { | |
318 | for (psymtab = objfile -> psymtabs; | |
319 | psymtab != NULL && result == NULL; | |
320 | psymtab = psymtab -> next) | |
321 | { | |
322 | result = (*func)(objfile, psymtab, arg1, arg2, arg3); | |
323 | } | |
324 | } | |
325 | return (result); | |
326 | } |