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c7743d02 HWN |
1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 Free Software Foundation, Inc. |
2 | * | |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
c7743d02 | 7 | * |
73be1d9e | 8 | * This library is distributed in the hope that it will be useful, |
c7743d02 | 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
c7743d02 | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
c7743d02 HWN |
17 | |
18 | ||
19 | \f | |
132fa21f RB |
20 | #if HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
23 | ||
c7743d02 HWN |
24 | #include <stdio.h> |
25 | #include <errno.h> | |
26 | #include <string.h> | |
27 | ||
28 | #ifdef __ia64__ | |
29 | #include <ucontext.h> | |
30 | extern unsigned long * __libc_ia64_register_backing_store_base; | |
31 | #endif | |
32 | ||
33 | #include "libguile/_scm.h" | |
34 | #include "libguile/eval.h" | |
35 | #include "libguile/stime.h" | |
36 | #include "libguile/stackchk.h" | |
37 | #include "libguile/struct.h" | |
38 | #include "libguile/smob.h" | |
39 | #include "libguile/unif.h" | |
40 | #include "libguile/async.h" | |
41 | #include "libguile/ports.h" | |
42 | #include "libguile/root.h" | |
43 | #include "libguile/strings.h" | |
44 | #include "libguile/vectors.h" | |
45 | #include "libguile/weaks.h" | |
46 | #include "libguile/hashtab.h" | |
47 | #include "libguile/tags.h" | |
48 | ||
49 | #include "libguile/validate.h" | |
50 | #include "libguile/deprecation.h" | |
51 | #include "libguile/gc.h" | |
52 | ||
53 | #include "libguile/private-gc.h" | |
54 | ||
55 | #ifdef GUILE_DEBUG_MALLOC | |
56 | #include "libguile/debug-malloc.h" | |
57 | #endif | |
58 | ||
59 | #ifdef HAVE_MALLOC_H | |
60 | #include <malloc.h> | |
61 | #endif | |
62 | ||
63 | #ifdef HAVE_UNISTD_H | |
64 | #include <unistd.h> | |
65 | #endif | |
66 | ||
67 | /* | |
68 | INIT_MALLOC_LIMIT is the initial amount of malloc usage which will | |
69 | trigger a GC. | |
70 | ||
71 | After startup (at the guile> prompt), we have approximately 100k of | |
72 | alloced memory, which won't go away on GC. Let's set the init such | |
73 | that we get a nice yield on the next allocation: | |
74 | */ | |
c2cbcc57 | 75 | #define SCM_DEFAULT_INIT_MALLOC_LIMIT 200*1024 |
c7743d02 HWN |
76 | #define SCM_DEFAULT_MALLOC_MINYIELD 40 |
77 | ||
61ef9c1f | 78 | /* #define DEBUGINFO */ |
c7743d02 HWN |
79 | |
80 | static int scm_i_minyield_malloc; | |
81 | ||
82 | void | |
83 | scm_gc_init_malloc (void) | |
84 | { | |
85 | scm_mtrigger = scm_getenv_int ("GUILE_INIT_MALLOC_LIMIT", | |
86 | SCM_DEFAULT_INIT_MALLOC_LIMIT); | |
87 | scm_i_minyield_malloc = scm_getenv_int ("GUILE_MIN_YIELD_MALLOC", | |
88 | SCM_DEFAULT_MALLOC_MINYIELD); | |
dac04e9f HWN |
89 | |
90 | if (scm_i_minyield_malloc >= 100) | |
91 | scm_i_minyield_malloc = 99; | |
92 | if (scm_i_minyield_malloc < 1) | |
93 | scm_i_minyield_malloc = 1; | |
94 | ||
95 | if (scm_mtrigger < 0) | |
96 | scm_mtrigger = SCM_DEFAULT_INIT_MALLOC_LIMIT; | |
c7743d02 HWN |
97 | } |
98 | ||
99 | ||
100 | \f | |
101 | /* Function for non-cell memory management. | |
102 | */ | |
103 | ||
c7743d02 HWN |
104 | void * |
105 | scm_realloc (void *mem, size_t size) | |
106 | { | |
107 | void *ptr; | |
108 | ||
109 | SCM_SYSCALL (ptr = realloc (mem, size)); | |
110 | if (ptr) | |
111 | return ptr; | |
112 | ||
fb50ef08 | 113 | scm_rec_mutex_lock (&scm_i_sweep_mutex); |
9bc4701c | 114 | |
c7743d02 HWN |
115 | scm_i_sweep_all_segments ("realloc"); |
116 | ||
117 | SCM_SYSCALL (ptr = realloc (mem, size)); | |
118 | if (ptr) | |
9bc4701c | 119 | { |
fb50ef08 | 120 | scm_rec_mutex_unlock (&scm_i_sweep_mutex); |
9bc4701c MD |
121 | return ptr; |
122 | } | |
c7743d02 HWN |
123 | |
124 | scm_igc ("realloc"); | |
125 | scm_i_sweep_all_segments ("realloc"); | |
126 | ||
fb50ef08 | 127 | scm_rec_mutex_unlock (&scm_i_sweep_mutex); |
9bc4701c | 128 | |
c7743d02 HWN |
129 | SCM_SYSCALL (ptr = realloc (mem, size)); |
130 | if (ptr) | |
131 | return ptr; | |
132 | ||
133 | scm_memory_error ("realloc"); | |
134 | } | |
135 | ||
39e8f371 HWN |
136 | void * |
137 | scm_malloc (size_t sz) | |
138 | { | |
139 | return scm_realloc (NULL, sz); | |
140 | } | |
ba1b2226 HWN |
141 | |
142 | /* | |
143 | Hmm. Should we use the C convention for arguments (i.e. N_ELTS, | |
144 | SIZEOF_ELT)? --hwn | |
145 | */ | |
146 | void * | |
147 | scm_calloc (size_t sz) | |
148 | { | |
1383773b HWN |
149 | void * ptr; |
150 | ||
151 | /* | |
152 | By default, try to use calloc, as it is likely more efficient than | |
153 | calling memset by hand. | |
154 | */ | |
fb50ef08 | 155 | SCM_SYSCALL (ptr = calloc (sz, 1)); |
1383773b HWN |
156 | if (ptr) |
157 | return ptr; | |
158 | ||
159 | ptr = scm_realloc (NULL, sz); | |
ba1b2226 HWN |
160 | memset (ptr, 0x0, sz); |
161 | return ptr; | |
162 | } | |
163 | ||
39e8f371 | 164 | |
c7743d02 HWN |
165 | char * |
166 | scm_strndup (const char *str, size_t n) | |
167 | { | |
fb50ef08 | 168 | char *dst = scm_malloc (n + 1); |
c7743d02 HWN |
169 | memcpy (dst, str, n); |
170 | dst[n] = 0; | |
171 | return dst; | |
172 | } | |
173 | ||
174 | char * | |
175 | scm_strdup (const char *str) | |
176 | { | |
177 | return scm_strndup (str, strlen (str)); | |
178 | } | |
179 | ||
180 | void | |
181 | scm_gc_register_collectable_memory (void *mem, size_t size, const char *what) | |
182 | { | |
183 | scm_mallocated += size; | |
184 | ||
185 | /* | |
186 | we could finish the full sweep (without mark) here, but in | |
187 | practice this turns out to be ineffective. | |
188 | */ | |
189 | ||
190 | /* | |
191 | A program that uses a lot of malloced collectable memory (vectors, | |
192 | strings), will use a lot of memory off the cell-heap; it needs to | |
193 | do GC more often (before cells are exhausted), otherwise swapping | |
194 | and malloc management will tie it down. | |
195 | */ | |
196 | if (scm_mallocated > scm_mtrigger) | |
197 | { | |
9bc4701c | 198 | unsigned long prev_alloced; |
c7743d02 HWN |
199 | float yield; |
200 | ||
fb50ef08 | 201 | scm_rec_mutex_lock (&scm_i_sweep_mutex); |
9bc4701c MD |
202 | |
203 | prev_alloced = scm_mallocated; | |
c7743d02 | 204 | scm_igc (what); |
9bc4701c | 205 | scm_i_sweep_all_segments ("mtrigger"); |
c7743d02 | 206 | |
fb50ef08 MD |
207 | yield = (((float) prev_alloced - (float) scm_mallocated) |
208 | / (float) prev_alloced); | |
ffd72400 | 209 | |
c2cbcc57 | 210 | scm_gc_malloc_yield_percentage = (int) (100 * yield); |
61ef9c1f HWN |
211 | |
212 | #ifdef DEBUGINFO | |
c7743d02 | 213 | fprintf (stderr, "prev %lud , now %lud, yield %4.2lf, want %d", |
fb50ef08 MD |
214 | prev_alloced, |
215 | scm_mallocated, | |
216 | 100.0 * yield, | |
217 | scm_i_minyield_malloc); | |
61ef9c1f HWN |
218 | #endif |
219 | ||
c7743d02 HWN |
220 | if (yield < scm_i_minyield_malloc / 100.0) |
221 | { | |
222 | /* | |
223 | We make the trigger a little larger, even; If you have a | |
224 | program that builds up a lot of data in strings, then the | |
225 | desired yield will never be satisfied. | |
226 | ||
227 | Instead of getting bogged down, we let the mtrigger grow | |
228 | strongly with it. | |
229 | */ | |
e88e4f2e | 230 | float no_overflow_trigger = scm_mallocated * 110.0; |
dac04e9f | 231 | |
e88e4f2e | 232 | no_overflow_trigger /= (float) (100.0 - scm_i_minyield_malloc); |
dac04e9f | 233 | scm_mtrigger = (unsigned long) no_overflow_trigger; |
c7743d02 | 234 | |
61ef9c1f | 235 | #ifdef DEBUGINFO |
fb50ef08 MD |
236 | fprintf (stderr, "Mtrigger sweep: ineffective. New trigger %d\n", |
237 | scm_mtrigger); | |
61ef9c1f | 238 | #endif |
c7743d02 | 239 | } |
9bc4701c | 240 | |
fb50ef08 | 241 | scm_rec_mutex_unlock (&scm_i_sweep_mutex); |
c7743d02 HWN |
242 | } |
243 | ||
244 | #ifdef GUILE_DEBUG_MALLOC | |
245 | if (mem) | |
246 | scm_malloc_register (mem, what); | |
247 | #endif | |
248 | } | |
249 | ||
250 | void | |
251 | scm_gc_unregister_collectable_memory (void *mem, size_t size, const char *what) | |
252 | { | |
253 | scm_mallocated -= size; | |
254 | scm_gc_malloc_collected += size; | |
255 | ||
256 | #ifdef GUILE_DEBUG_MALLOC | |
257 | if (mem) | |
258 | scm_malloc_unregister (mem); | |
259 | #endif | |
260 | } | |
261 | ||
262 | void * | |
263 | scm_gc_malloc (size_t size, const char *what) | |
264 | { | |
265 | /* | |
266 | The straightforward implementation below has the problem | |
267 | that it might call the GC twice, once in scm_malloc and then | |
268 | again in scm_gc_register_collectable_memory. We don't really | |
269 | want the second GC since it will not find new garbage. | |
270 | ||
271 | ||
272 | Note: this is a theoretical peeve. In reality, malloc() never | |
273 | returns NULL. Usually, memory is overcommitted, and when you try | |
274 | to write it the program is killed with signal 11. --hwn | |
275 | */ | |
276 | ||
277 | void *ptr = scm_malloc (size); | |
278 | scm_gc_register_collectable_memory (ptr, size, what); | |
279 | return ptr; | |
280 | } | |
281 | ||
39e8f371 HWN |
282 | void * |
283 | scm_gc_calloc (size_t size, const char *what) | |
284 | { | |
285 | void *ptr = scm_gc_malloc (size, what); | |
286 | memset (ptr, 0x0, size); | |
287 | return ptr; | |
288 | } | |
289 | ||
290 | ||
c7743d02 HWN |
291 | void * |
292 | scm_gc_realloc (void *mem, size_t old_size, size_t new_size, const char *what) | |
293 | { | |
294 | /* XXX - see scm_gc_malloc. */ | |
295 | ||
296 | void *ptr = scm_realloc (mem, new_size); | |
297 | scm_gc_unregister_collectable_memory (mem, old_size, what); | |
298 | scm_gc_register_collectable_memory (ptr, new_size, what); | |
299 | return ptr; | |
300 | } | |
301 | ||
302 | void | |
303 | scm_gc_free (void *mem, size_t size, const char *what) | |
304 | { | |
305 | scm_gc_unregister_collectable_memory (mem, size, what); | |
306 | free (mem); | |
307 | } | |
308 | ||
309 | char * | |
310 | scm_gc_strndup (const char *str, size_t n, const char *what) | |
311 | { | |
312 | char *dst = scm_gc_malloc (n+1, what); | |
313 | memcpy (dst, str, n); | |
314 | dst[n] = 0; | |
315 | return dst; | |
316 | } | |
317 | ||
318 | char * | |
319 | scm_gc_strdup (const char *str, const char *what) | |
320 | { | |
321 | return scm_gc_strndup (str, strlen (str), what); | |
322 | } | |
323 | ||
324 | #if SCM_ENABLE_DEPRECATED == 1 | |
325 | ||
326 | /* {Deprecated front end to malloc} | |
327 | * | |
328 | * scm_must_malloc, scm_must_realloc, scm_must_free, scm_done_malloc, | |
329 | * scm_done_free | |
330 | * | |
331 | * These functions provide services comparable to malloc, realloc, and | |
332 | * free. They should be used when allocating memory that will be under | |
333 | * control of the garbage collector, i.e., if the memory may be freed | |
334 | * during garbage collection. | |
335 | * | |
336 | * They are deprecated because they weren't really used the way | |
337 | * outlined above, and making sure to return the right amount from | |
338 | * smob free routines was sometimes difficult when dealing with nested | |
339 | * data structures. We basically want everybody to review their code | |
340 | * and use the more symmetrical scm_gc_malloc/scm_gc_free functions | |
341 | * instead. In some cases, where scm_must_malloc has been used | |
342 | * incorrectly (i.e. for non-GC-able memory), use scm_malloc/free. | |
343 | */ | |
344 | ||
345 | void * | |
346 | scm_must_malloc (size_t size, const char *what) | |
347 | { | |
348 | scm_c_issue_deprecation_warning | |
349 | ("scm_must_malloc is deprecated. " | |
350 | "Use scm_gc_malloc and scm_gc_free instead."); | |
351 | ||
352 | return scm_gc_malloc (size, what); | |
353 | } | |
354 | ||
355 | void * | |
356 | scm_must_realloc (void *where, | |
357 | size_t old_size, | |
358 | size_t size, | |
359 | const char *what) | |
360 | { | |
361 | scm_c_issue_deprecation_warning | |
362 | ("scm_must_realloc is deprecated. " | |
363 | "Use scm_gc_realloc and scm_gc_free instead."); | |
364 | ||
365 | return scm_gc_realloc (where, old_size, size, what); | |
366 | } | |
367 | ||
368 | char * | |
369 | scm_must_strndup (const char *str, size_t length) | |
370 | { | |
371 | scm_c_issue_deprecation_warning | |
372 | ("scm_must_strndup is deprecated. " | |
373 | "Use scm_gc_strndup and scm_gc_free instead."); | |
374 | ||
375 | return scm_gc_strndup (str, length, "string"); | |
376 | } | |
377 | ||
378 | char * | |
379 | scm_must_strdup (const char *str) | |
380 | { | |
381 | scm_c_issue_deprecation_warning | |
382 | ("scm_must_strdup is deprecated. " | |
383 | "Use scm_gc_strdup and scm_gc_free instead."); | |
384 | ||
385 | return scm_gc_strdup (str, "string"); | |
386 | } | |
387 | ||
388 | void | |
389 | scm_must_free (void *obj) | |
390 | #define FUNC_NAME "scm_must_free" | |
391 | { | |
392 | scm_c_issue_deprecation_warning | |
393 | ("scm_must_free is deprecated. " | |
394 | "Use scm_gc_malloc and scm_gc_free instead."); | |
395 | ||
396 | #ifdef GUILE_DEBUG_MALLOC | |
397 | scm_malloc_unregister (obj); | |
398 | #endif | |
399 | if (obj) | |
400 | free (obj); | |
401 | else | |
be3ff021 HWN |
402 | { |
403 | fprintf (stderr,"freeing NULL pointer"); | |
404 | abort (); | |
405 | } | |
c7743d02 HWN |
406 | } |
407 | #undef FUNC_NAME | |
408 | ||
409 | ||
410 | void | |
411 | scm_done_malloc (long size) | |
412 | { | |
413 | scm_c_issue_deprecation_warning | |
414 | ("scm_done_malloc is deprecated. " | |
415 | "Use scm_gc_register_collectable_memory instead."); | |
416 | ||
417 | scm_gc_register_collectable_memory (NULL, size, "foreign mallocs"); | |
418 | } | |
419 | ||
420 | void | |
421 | scm_done_free (long size) | |
422 | { | |
423 | scm_c_issue_deprecation_warning | |
424 | ("scm_done_free is deprecated. " | |
425 | "Use scm_gc_unregister_collectable_memory instead."); | |
426 | ||
427 | scm_gc_unregister_collectable_memory (NULL, size, "foreign mallocs"); | |
428 | } | |
429 | ||
430 | #endif /* SCM_ENABLE_DEPRECATED == 1 */ |