Mercurial > hg > CbC > CbC_gcc
annotate gcc/ggc-common.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | f6334be47118 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* Simple garbage collection for the GNU compiler. |
| 111 | 2 Copyright (C) 1999-2017 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 /* Generic garbage collection (GC) functions and data, not specific to | |
| 21 any particular GC implementation. */ | |
| 22 | |
| 23 #include "config.h" | |
| 24 #include "system.h" | |
| 25 #include "coretypes.h" | |
| 111 | 26 #include "timevar.h" |
| 27 #include "diagnostic-core.h" | |
|
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28 #include "ggc-internal.h" |
| 0 | 29 #include "params.h" |
| 30 #include "hosthooks.h" | |
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31 #include "plugin.h" |
| 0 | 32 |
| 33 /* When set, ggc_collect will do collection. */ | |
| 34 bool ggc_force_collect; | |
| 35 | |
| 36 /* When true, protect the contents of the identifier hash table. */ | |
| 37 bool ggc_protect_identifiers = true; | |
| 38 | |
| 39 /* Statistics about the allocation. */ | |
| 40 static ggc_statistics *ggc_stats; | |
| 41 | |
| 42 struct traversal_state; | |
| 43 | |
| 44 static int compare_ptr_data (const void *, const void *); | |
| 45 static void relocate_ptrs (void *, void *); | |
| 46 static void write_pch_globals (const struct ggc_root_tab * const *tab, | |
| 47 struct traversal_state *state); | |
| 48 | |
| 49 /* Maintain global roots that are preserved during GC. */ | |
| 50 | |
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51 /* This extra vector of dynamically registered root_tab-s is used by |
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52 ggc_mark_roots and gives the ability to dynamically add new GGC root |
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53 tables, for instance from some plugins; this vector is on the heap |
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54 since it is used by GGC internally. */ |
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55 typedef const struct ggc_root_tab *const_ggc_root_tab_t; |
| 111 | 56 static vec<const_ggc_root_tab_t> extra_root_vec; |
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57 |
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58 /* Dynamically register a new GGC root table RT. This is useful for |
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59 plugins. */ |
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60 |
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61 void |
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62 ggc_register_root_tab (const struct ggc_root_tab* rt) |
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63 { |
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64 if (rt) |
| 111 | 65 extra_root_vec.safe_push (rt); |
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66 } |
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67 |
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68 /* Mark all the roots in the table RT. */ |
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69 |
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70 static void |
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71 ggc_mark_root_tab (const_ggc_root_tab_t rt) |
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72 { |
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73 size_t i; |
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74 |
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75 for ( ; rt->base != NULL; rt++) |
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76 for (i = 0; i < rt->nelt; i++) |
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77 (*rt->cb) (*(void **) ((char *)rt->base + rt->stride * i)); |
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78 } |
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79 |
| 0 | 80 /* Iterate through all registered roots and mark each element. */ |
| 81 | |
| 82 void | |
| 83 ggc_mark_roots (void) | |
| 84 { | |
| 85 const struct ggc_root_tab *const *rt; | |
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86 const_ggc_root_tab_t rtp, rti; |
| 0 | 87 size_t i; |
| 88 | |
| 89 for (rt = gt_ggc_deletable_rtab; *rt; rt++) | |
| 90 for (rti = *rt; rti->base != NULL; rti++) | |
| 91 memset (rti->base, 0, rti->stride); | |
| 92 | |
| 93 for (rt = gt_ggc_rtab; *rt; rt++) | |
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94 ggc_mark_root_tab (*rt); |
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95 |
| 111 | 96 FOR_EACH_VEC_ELT (extra_root_vec, i, rtp) |
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97 ggc_mark_root_tab (rtp); |
| 0 | 98 |
| 99 if (ggc_protect_identifiers) | |
| 100 ggc_mark_stringpool (); | |
| 101 | |
| 111 | 102 gt_clear_caches (); |
| 0 | 103 |
| 104 if (! ggc_protect_identifiers) | |
| 105 ggc_purge_stringpool (); | |
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106 |
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107 /* Some plugins may call ggc_set_mark from here. */ |
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108 invoke_plugin_callbacks (PLUGIN_GGC_MARKING, NULL); |
| 0 | 109 } |
| 110 | |
| 111 /* Allocate a block of memory, then clear it. */ | |
| 112 void * | |
| 111 | 113 ggc_internal_cleared_alloc (size_t size, void (*f)(void *), size_t s, size_t n |
| 114 MEM_STAT_DECL) | |
| 0 | 115 { |
| 111 | 116 void *buf = ggc_internal_alloc (size, f, s, n PASS_MEM_STAT); |
| 0 | 117 memset (buf, 0, size); |
| 118 return buf; | |
| 119 } | |
| 120 | |
| 121 /* Resize a block of memory, possibly re-allocating it. */ | |
| 122 void * | |
| 111 | 123 ggc_realloc (void *x, size_t size MEM_STAT_DECL) |
| 0 | 124 { |
| 125 void *r; | |
| 126 size_t old_size; | |
| 127 | |
| 128 if (x == NULL) | |
| 111 | 129 return ggc_internal_alloc (size PASS_MEM_STAT); |
| 0 | 130 |
| 131 old_size = ggc_get_size (x); | |
| 132 | |
| 133 if (size <= old_size) | |
| 134 { | |
| 135 /* Mark the unwanted memory as unaccessible. We also need to make | |
| 136 the "new" size accessible, since ggc_get_size returns the size of | |
| 137 the pool, not the size of the individually allocated object, the | |
| 138 size which was previously made accessible. Unfortunately, we | |
| 139 don't know that previously allocated size. Without that | |
| 140 knowledge we have to lose some initialization-tracking for the | |
| 141 old parts of the object. An alternative is to mark the whole | |
| 142 old_size as reachable, but that would lose tracking of writes | |
| 143 after the end of the object (by small offsets). Discard the | |
| 144 handle to avoid handle leak. */ | |
| 145 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS ((char *) x + size, | |
| 146 old_size - size)); | |
| 147 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (x, size)); | |
| 148 return x; | |
| 149 } | |
| 150 | |
| 111 | 151 r = ggc_internal_alloc (size PASS_MEM_STAT); |
| 0 | 152 |
| 153 /* Since ggc_get_size returns the size of the pool, not the size of the | |
| 154 individually allocated object, we'd access parts of the old object | |
| 155 that were marked invalid with the memcpy below. We lose a bit of the | |
| 156 initialization-tracking since some of it may be uninitialized. */ | |
| 157 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (x, old_size)); | |
| 158 | |
| 159 memcpy (r, x, old_size); | |
| 160 | |
| 161 /* The old object is not supposed to be used anymore. */ | |
| 162 ggc_free (x); | |
| 163 | |
| 164 return r; | |
| 165 } | |
| 166 | |
| 167 void * | |
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168 ggc_cleared_alloc_htab_ignore_args (size_t c ATTRIBUTE_UNUSED, |
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169 size_t n ATTRIBUTE_UNUSED) |
| 0 | 170 { |
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171 gcc_assert (c * n == sizeof (struct htab)); |
| 111 | 172 return ggc_cleared_alloc<htab> (); |
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173 } |
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174 |
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175 /* TODO: once we actually use type information in GGC, create a new tag |
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176 gt_gcc_ptr_array and use it for pointer arrays. */ |
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177 void * |
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178 ggc_cleared_alloc_ptr_array_two_args (size_t c, size_t n) |
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179 { |
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180 gcc_assert (sizeof (PTR *) == n); |
| 111 | 181 return ggc_cleared_vec_alloc<PTR *> (c); |
| 0 | 182 } |
| 183 | |
| 184 /* These are for splay_tree_new_ggc. */ | |
| 185 void * | |
| 111 | 186 ggc_splay_alloc (int sz, void *nl) |
| 0 | 187 { |
| 188 gcc_assert (!nl); | |
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189 return ggc_internal_alloc (sz); |
| 0 | 190 } |
| 191 | |
| 192 void | |
| 193 ggc_splay_dont_free (void * x ATTRIBUTE_UNUSED, void *nl) | |
| 194 { | |
| 195 gcc_assert (!nl); | |
| 196 } | |
| 197 | |
| 198 /* Print statistics that are independent of the collector in use. */ | |
| 199 #define SCALE(x) ((unsigned long) ((x) < 1024*10 \ | |
| 200 ? (x) \ | |
| 201 : ((x) < 1024*1024*10 \ | |
| 202 ? (x) / 1024 \ | |
| 203 : (x) / (1024*1024)))) | |
| 204 #define LABEL(x) ((x) < 1024*10 ? ' ' : ((x) < 1024*1024*10 ? 'k' : 'M')) | |
| 205 | |
| 206 void | |
| 207 ggc_print_common_statistics (FILE *stream ATTRIBUTE_UNUSED, | |
| 208 ggc_statistics *stats) | |
| 209 { | |
| 210 /* Set the pointer so that during collection we will actually gather | |
| 211 the statistics. */ | |
| 212 ggc_stats = stats; | |
| 213 | |
| 214 /* Then do one collection to fill in the statistics. */ | |
| 215 ggc_collect (); | |
| 216 | |
| 217 /* At present, we don't really gather any interesting statistics. */ | |
| 218 | |
| 219 /* Don't gather statistics any more. */ | |
| 220 ggc_stats = NULL; | |
| 221 } | |
| 222 | |
| 223 /* Functions for saving and restoring GCable memory to disk. */ | |
| 224 | |
| 225 struct ptr_data | |
| 226 { | |
| 227 void *obj; | |
| 228 void *note_ptr_cookie; | |
| 229 gt_note_pointers note_ptr_fn; | |
| 230 gt_handle_reorder reorder_fn; | |
| 231 size_t size; | |
| 232 void *new_addr; | |
| 111 | 233 }; |
| 234 | |
| 235 #define POINTER_HASH(x) (hashval_t)((intptr_t)x >> 3) | |
| 236 | |
| 237 /* Helper for hashing saving_htab. */ | |
| 238 | |
| 239 struct saving_hasher : free_ptr_hash <ptr_data> | |
| 240 { | |
| 241 typedef void *compare_type; | |
| 242 static inline hashval_t hash (const ptr_data *); | |
| 243 static inline bool equal (const ptr_data *, const void *); | |
| 0 | 244 }; |
| 245 | |
| 111 | 246 inline hashval_t |
| 247 saving_hasher::hash (const ptr_data *p) | |
| 248 { | |
| 249 return POINTER_HASH (p->obj); | |
| 250 } | |
| 251 | |
| 252 inline bool | |
| 253 saving_hasher::equal (const ptr_data *p1, const void *p2) | |
| 254 { | |
| 255 return p1->obj == p2; | |
| 256 } | |
| 257 | |
| 258 static hash_table<saving_hasher> *saving_htab; | |
| 0 | 259 |
| 260 /* Register an object in the hash table. */ | |
| 261 | |
| 262 int | |
| 263 gt_pch_note_object (void *obj, void *note_ptr_cookie, | |
| 111 | 264 gt_note_pointers note_ptr_fn) |
| 0 | 265 { |
| 266 struct ptr_data **slot; | |
| 267 | |
| 268 if (obj == NULL || obj == (void *) 1) | |
| 269 return 0; | |
| 270 | |
| 271 slot = (struct ptr_data **) | |
| 111 | 272 saving_htab->find_slot_with_hash (obj, POINTER_HASH (obj), INSERT); |
| 0 | 273 if (*slot != NULL) |
| 274 { | |
| 275 gcc_assert ((*slot)->note_ptr_fn == note_ptr_fn | |
| 276 && (*slot)->note_ptr_cookie == note_ptr_cookie); | |
| 277 return 0; | |
| 278 } | |
| 279 | |
| 280 *slot = XCNEW (struct ptr_data); | |
| 281 (*slot)->obj = obj; | |
| 282 (*slot)->note_ptr_fn = note_ptr_fn; | |
| 283 (*slot)->note_ptr_cookie = note_ptr_cookie; | |
| 284 if (note_ptr_fn == gt_pch_p_S) | |
| 285 (*slot)->size = strlen ((const char *)obj) + 1; | |
| 286 else | |
| 287 (*slot)->size = ggc_get_size (obj); | |
| 288 return 1; | |
| 289 } | |
| 290 | |
| 291 /* Register an object in the hash table. */ | |
| 292 | |
| 293 void | |
| 294 gt_pch_note_reorder (void *obj, void *note_ptr_cookie, | |
| 295 gt_handle_reorder reorder_fn) | |
| 296 { | |
| 297 struct ptr_data *data; | |
| 298 | |
| 299 if (obj == NULL || obj == (void *) 1) | |
| 300 return; | |
| 301 | |
| 302 data = (struct ptr_data *) | |
| 111 | 303 saving_htab->find_with_hash (obj, POINTER_HASH (obj)); |
| 0 | 304 gcc_assert (data && data->note_ptr_cookie == note_ptr_cookie); |
| 305 | |
| 306 data->reorder_fn = reorder_fn; | |
| 307 } | |
| 308 | |
| 309 /* Handy state for the traversal functions. */ | |
| 310 | |
| 311 struct traversal_state | |
| 312 { | |
| 313 FILE *f; | |
| 314 struct ggc_pch_data *d; | |
| 315 size_t count; | |
| 316 struct ptr_data **ptrs; | |
| 317 size_t ptrs_i; | |
| 318 }; | |
| 319 | |
| 320 /* Callbacks for htab_traverse. */ | |
| 321 | |
| 111 | 322 int |
| 323 ggc_call_count (ptr_data **slot, traversal_state *state) | |
| 0 | 324 { |
| 111 | 325 struct ptr_data *d = *slot; |
| 0 | 326 |
| 327 ggc_pch_count_object (state->d, d->obj, d->size, | |
| 111 | 328 d->note_ptr_fn == gt_pch_p_S); |
| 0 | 329 state->count++; |
| 330 return 1; | |
| 331 } | |
| 332 | |
| 111 | 333 int |
| 334 ggc_call_alloc (ptr_data **slot, traversal_state *state) | |
| 0 | 335 { |
| 111 | 336 struct ptr_data *d = *slot; |
| 0 | 337 |
| 338 d->new_addr = ggc_pch_alloc_object (state->d, d->obj, d->size, | |
| 111 | 339 d->note_ptr_fn == gt_pch_p_S); |
| 0 | 340 state->ptrs[state->ptrs_i++] = d; |
| 341 return 1; | |
| 342 } | |
| 343 | |
| 344 /* Callback for qsort. */ | |
| 345 | |
| 346 static int | |
| 347 compare_ptr_data (const void *p1_p, const void *p2_p) | |
| 348 { | |
| 349 const struct ptr_data *const p1 = *(const struct ptr_data *const *)p1_p; | |
| 350 const struct ptr_data *const p2 = *(const struct ptr_data *const *)p2_p; | |
| 351 return (((size_t)p1->new_addr > (size_t)p2->new_addr) | |
| 352 - ((size_t)p1->new_addr < (size_t)p2->new_addr)); | |
| 353 } | |
| 354 | |
| 355 /* Callbacks for note_ptr_fn. */ | |
| 356 | |
| 357 static void | |
| 358 relocate_ptrs (void *ptr_p, void *state_p) | |
| 359 { | |
| 360 void **ptr = (void **)ptr_p; | |
| 361 struct traversal_state *state ATTRIBUTE_UNUSED | |
| 362 = (struct traversal_state *)state_p; | |
| 363 struct ptr_data *result; | |
| 364 | |
| 365 if (*ptr == NULL || *ptr == (void *)1) | |
| 366 return; | |
| 367 | |
| 368 result = (struct ptr_data *) | |
| 111 | 369 saving_htab->find_with_hash (*ptr, POINTER_HASH (*ptr)); |
| 0 | 370 gcc_assert (result); |
| 371 *ptr = result->new_addr; | |
| 372 } | |
| 373 | |
| 374 /* Write out, after relocation, the pointers in TAB. */ | |
| 375 static void | |
| 376 write_pch_globals (const struct ggc_root_tab * const *tab, | |
| 377 struct traversal_state *state) | |
| 378 { | |
| 379 const struct ggc_root_tab *const *rt; | |
| 380 const struct ggc_root_tab *rti; | |
| 381 size_t i; | |
| 382 | |
| 383 for (rt = tab; *rt; rt++) | |
| 384 for (rti = *rt; rti->base != NULL; rti++) | |
| 385 for (i = 0; i < rti->nelt; i++) | |
| 386 { | |
| 387 void *ptr = *(void **)((char *)rti->base + rti->stride * i); | |
| 388 struct ptr_data *new_ptr; | |
| 389 if (ptr == NULL || ptr == (void *)1) | |
| 390 { | |
| 391 if (fwrite (&ptr, sizeof (void *), 1, state->f) | |
| 392 != 1) | |
| 111 | 393 fatal_error (input_location, "can%'t write PCH file: %m"); |
| 0 | 394 } |
| 395 else | |
| 396 { | |
| 397 new_ptr = (struct ptr_data *) | |
| 111 | 398 saving_htab->find_with_hash (ptr, POINTER_HASH (ptr)); |
| 0 | 399 if (fwrite (&new_ptr->new_addr, sizeof (void *), 1, state->f) |
| 400 != 1) | |
| 111 | 401 fatal_error (input_location, "can%'t write PCH file: %m"); |
| 0 | 402 } |
| 403 } | |
| 404 } | |
| 405 | |
| 406 /* Hold the information we need to mmap the file back in. */ | |
| 407 | |
| 408 struct mmap_info | |
| 409 { | |
| 410 size_t offset; | |
| 411 size_t size; | |
| 412 void *preferred_base; | |
| 413 }; | |
| 414 | |
| 415 /* Write out the state of the compiler to F. */ | |
| 416 | |
| 417 void | |
| 418 gt_pch_save (FILE *f) | |
| 419 { | |
| 420 const struct ggc_root_tab *const *rt; | |
| 421 const struct ggc_root_tab *rti; | |
| 422 size_t i; | |
| 423 struct traversal_state state; | |
| 424 char *this_object = NULL; | |
| 425 size_t this_object_size = 0; | |
| 426 struct mmap_info mmi; | |
| 111 | 427 const size_t mmap_offset_alignment = host_hooks.gt_pch_alloc_granularity (); |
| 0 | 428 |
| 429 gt_pch_save_stringpool (); | |
| 430 | |
|
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431 timevar_push (TV_PCH_PTR_REALLOC); |
| 111 | 432 saving_htab = new hash_table<saving_hasher> (50000); |
| 0 | 433 |
| 434 for (rt = gt_ggc_rtab; *rt; rt++) | |
| 435 for (rti = *rt; rti->base != NULL; rti++) | |
| 436 for (i = 0; i < rti->nelt; i++) | |
| 437 (*rti->pchw)(*(void **)((char *)rti->base + rti->stride * i)); | |
| 438 | |
| 439 /* Prepare the objects for writing, determine addresses and such. */ | |
| 440 state.f = f; | |
|
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441 state.d = init_ggc_pch (); |
| 0 | 442 state.count = 0; |
| 111 | 443 saving_htab->traverse <traversal_state *, ggc_call_count> (&state); |
| 0 | 444 |
| 445 mmi.size = ggc_pch_total_size (state.d); | |
| 446 | |
| 447 /* Try to arrange things so that no relocation is necessary, but | |
| 448 don't try very hard. On most platforms, this will always work, | |
|
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449 and on the rest it's a lot of work to do better. |
| 0 | 450 (The extra work goes in HOST_HOOKS_GT_PCH_GET_ADDRESS and |
| 451 HOST_HOOKS_GT_PCH_USE_ADDRESS.) */ | |
| 452 mmi.preferred_base = host_hooks.gt_pch_get_address (mmi.size, fileno (f)); | |
|
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453 |
| 0 | 454 ggc_pch_this_base (state.d, mmi.preferred_base); |
| 455 | |
| 456 state.ptrs = XNEWVEC (struct ptr_data *, state.count); | |
| 457 state.ptrs_i = 0; | |
|
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458 |
| 111 | 459 saving_htab->traverse <traversal_state *, ggc_call_alloc> (&state); |
|
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460 timevar_pop (TV_PCH_PTR_REALLOC); |
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461 |
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462 timevar_push (TV_PCH_PTR_SORT); |
| 0 | 463 qsort (state.ptrs, state.count, sizeof (*state.ptrs), compare_ptr_data); |
|
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464 timevar_pop (TV_PCH_PTR_SORT); |
| 0 | 465 |
| 466 /* Write out all the scalar variables. */ | |
| 467 for (rt = gt_pch_scalar_rtab; *rt; rt++) | |
| 468 for (rti = *rt; rti->base != NULL; rti++) | |
| 469 if (fwrite (rti->base, rti->stride, 1, f) != 1) | |
| 111 | 470 fatal_error (input_location, "can%'t write PCH file: %m"); |
| 0 | 471 |
| 472 /* Write out all the global pointers, after translation. */ | |
| 473 write_pch_globals (gt_ggc_rtab, &state); | |
| 474 | |
| 475 /* Pad the PCH file so that the mmapped area starts on an allocation | |
| 476 granularity (usually page) boundary. */ | |
| 477 { | |
| 478 long o; | |
| 479 o = ftell (state.f) + sizeof (mmi); | |
| 480 if (o == -1) | |
| 111 | 481 fatal_error (input_location, "can%'t get position in PCH file: %m"); |
| 0 | 482 mmi.offset = mmap_offset_alignment - o % mmap_offset_alignment; |
| 483 if (mmi.offset == mmap_offset_alignment) | |
| 484 mmi.offset = 0; | |
| 485 mmi.offset += o; | |
| 486 } | |
| 487 if (fwrite (&mmi, sizeof (mmi), 1, state.f) != 1) | |
| 111 | 488 fatal_error (input_location, "can%'t write PCH file: %m"); |
| 0 | 489 if (mmi.offset != 0 |
| 490 && fseek (state.f, mmi.offset, SEEK_SET) != 0) | |
| 111 | 491 fatal_error (input_location, "can%'t write padding to PCH file: %m"); |
| 0 | 492 |
| 493 ggc_pch_prepare_write (state.d, state.f); | |
| 494 | |
| 111 | 495 #if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS |
| 496 vec<char> vbits = vNULL; | |
| 497 #endif | |
| 498 | |
| 0 | 499 /* Actually write out the objects. */ |
| 500 for (i = 0; i < state.count; i++) | |
| 501 { | |
| 502 if (this_object_size < state.ptrs[i]->size) | |
| 503 { | |
| 504 this_object_size = state.ptrs[i]->size; | |
| 505 this_object = XRESIZEVAR (char, this_object, this_object_size); | |
| 506 } | |
| 111 | 507 #if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS |
| 508 /* obj might contain uninitialized bytes, e.g. in the trailing | |
| 509 padding of the object. Avoid warnings by making the memory | |
| 510 temporarily defined and then restoring previous state. */ | |
| 511 int get_vbits = 0; | |
| 512 size_t valid_size = state.ptrs[i]->size; | |
| 513 if (__builtin_expect (RUNNING_ON_VALGRIND, 0)) | |
| 514 { | |
| 515 if (vbits.length () < valid_size) | |
| 516 vbits.safe_grow (valid_size); | |
| 517 get_vbits = VALGRIND_GET_VBITS (state.ptrs[i]->obj, | |
| 518 vbits.address (), valid_size); | |
| 519 if (get_vbits == 3) | |
| 520 { | |
| 521 /* We assume that first part of obj is addressable, and | |
| 522 the rest is unaddressable. Find out where the boundary is | |
| 523 using binary search. */ | |
| 524 size_t lo = 0, hi = valid_size; | |
| 525 while (hi > lo) | |
| 526 { | |
| 527 size_t mid = (lo + hi) / 2; | |
| 528 get_vbits = VALGRIND_GET_VBITS ((char *) state.ptrs[i]->obj | |
| 529 + mid, vbits.address (), | |
| 530 1); | |
| 531 if (get_vbits == 3) | |
| 532 hi = mid; | |
| 533 else if (get_vbits == 1) | |
| 534 lo = mid + 1; | |
| 535 else | |
| 536 break; | |
| 537 } | |
| 538 if (get_vbits == 1 || get_vbits == 3) | |
| 539 { | |
| 540 valid_size = lo; | |
| 541 get_vbits = VALGRIND_GET_VBITS (state.ptrs[i]->obj, | |
| 542 vbits.address (), | |
| 543 valid_size); | |
| 544 } | |
| 545 } | |
| 546 if (get_vbits == 1) | |
| 547 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (state.ptrs[i]->obj, | |
| 548 state.ptrs[i]->size)); | |
| 549 } | |
| 550 #endif | |
| 0 | 551 memcpy (this_object, state.ptrs[i]->obj, state.ptrs[i]->size); |
| 552 if (state.ptrs[i]->reorder_fn != NULL) | |
| 553 state.ptrs[i]->reorder_fn (state.ptrs[i]->obj, | |
| 554 state.ptrs[i]->note_ptr_cookie, | |
| 555 relocate_ptrs, &state); | |
| 556 state.ptrs[i]->note_ptr_fn (state.ptrs[i]->obj, | |
| 557 state.ptrs[i]->note_ptr_cookie, | |
| 558 relocate_ptrs, &state); | |
| 559 ggc_pch_write_object (state.d, state.f, state.ptrs[i]->obj, | |
| 560 state.ptrs[i]->new_addr, state.ptrs[i]->size, | |
| 561 state.ptrs[i]->note_ptr_fn == gt_pch_p_S); | |
| 562 if (state.ptrs[i]->note_ptr_fn != gt_pch_p_S) | |
| 563 memcpy (state.ptrs[i]->obj, this_object, state.ptrs[i]->size); | |
| 111 | 564 #if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS |
| 565 if (__builtin_expect (get_vbits == 1, 0)) | |
| 566 { | |
| 567 (void) VALGRIND_SET_VBITS (state.ptrs[i]->obj, vbits.address (), | |
| 568 valid_size); | |
| 569 if (valid_size != state.ptrs[i]->size) | |
| 570 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS ((char *) | |
| 571 state.ptrs[i]->obj | |
| 572 + valid_size, | |
| 573 state.ptrs[i]->size | |
| 574 - valid_size)); | |
| 575 } | |
| 576 #endif | |
| 0 | 577 } |
| 111 | 578 #if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS |
| 579 vbits.release (); | |
| 580 #endif | |
| 581 | |
| 0 | 582 ggc_pch_finish (state.d, state.f); |
| 583 gt_pch_fixup_stringpool (); | |
| 584 | |
| 111 | 585 XDELETE (state.ptrs); |
| 586 XDELETE (this_object); | |
| 587 delete saving_htab; | |
| 588 saving_htab = NULL; | |
| 0 | 589 } |
| 590 | |
| 591 /* Read the state of the compiler back in from F. */ | |
| 592 | |
| 593 void | |
| 594 gt_pch_restore (FILE *f) | |
| 595 { | |
| 596 const struct ggc_root_tab *const *rt; | |
| 597 const struct ggc_root_tab *rti; | |
| 598 size_t i; | |
| 599 struct mmap_info mmi; | |
| 600 int result; | |
| 601 | |
| 602 /* Delete any deletable objects. This makes ggc_pch_read much | |
| 603 faster, as it can be sure that no GCable objects remain other | |
| 604 than the ones just read in. */ | |
| 605 for (rt = gt_ggc_deletable_rtab; *rt; rt++) | |
| 606 for (rti = *rt; rti->base != NULL; rti++) | |
| 607 memset (rti->base, 0, rti->stride); | |
| 608 | |
| 609 /* Read in all the scalar variables. */ | |
| 610 for (rt = gt_pch_scalar_rtab; *rt; rt++) | |
| 611 for (rti = *rt; rti->base != NULL; rti++) | |
| 612 if (fread (rti->base, rti->stride, 1, f) != 1) | |
| 111 | 613 fatal_error (input_location, "can%'t read PCH file: %m"); |
| 0 | 614 |
| 615 /* Read in all the global pointers, in 6 easy loops. */ | |
| 616 for (rt = gt_ggc_rtab; *rt; rt++) | |
| 617 for (rti = *rt; rti->base != NULL; rti++) | |
| 618 for (i = 0; i < rti->nelt; i++) | |
| 619 if (fread ((char *)rti->base + rti->stride * i, | |
| 620 sizeof (void *), 1, f) != 1) | |
| 111 | 621 fatal_error (input_location, "can%'t read PCH file: %m"); |
| 0 | 622 |
| 623 if (fread (&mmi, sizeof (mmi), 1, f) != 1) | |
| 111 | 624 fatal_error (input_location, "can%'t read PCH file: %m"); |
| 0 | 625 |
| 626 result = host_hooks.gt_pch_use_address (mmi.preferred_base, mmi.size, | |
| 627 fileno (f), mmi.offset); | |
| 628 if (result < 0) | |
| 111 | 629 fatal_error (input_location, "had to relocate PCH"); |
| 0 | 630 if (result == 0) |
| 631 { | |
| 632 if (fseek (f, mmi.offset, SEEK_SET) != 0 | |
| 633 || fread (mmi.preferred_base, mmi.size, 1, f) != 1) | |
| 111 | 634 fatal_error (input_location, "can%'t read PCH file: %m"); |
| 0 | 635 } |
| 636 else if (fseek (f, mmi.offset + mmi.size, SEEK_SET) != 0) | |
| 111 | 637 fatal_error (input_location, "can%'t read PCH file: %m"); |
| 0 | 638 |
| 639 ggc_pch_read (f, mmi.preferred_base); | |
| 640 | |
| 641 gt_pch_restore_stringpool (); | |
| 642 } | |
| 643 | |
| 644 /* Default version of HOST_HOOKS_GT_PCH_GET_ADDRESS when mmap is not present. | |
| 645 Select no address whatsoever, and let gt_pch_save choose what it will with | |
| 646 malloc, presumably. */ | |
| 647 | |
| 648 void * | |
| 649 default_gt_pch_get_address (size_t size ATTRIBUTE_UNUSED, | |
| 650 int fd ATTRIBUTE_UNUSED) | |
| 651 { | |
| 652 return NULL; | |
| 653 } | |
| 654 | |
| 655 /* Default version of HOST_HOOKS_GT_PCH_USE_ADDRESS when mmap is not present. | |
| 656 Allocate SIZE bytes with malloc. Return 0 if the address we got is the | |
| 657 same as base, indicating that the memory has been allocated but needs to | |
| 658 be read in from the file. Return -1 if the address differs, to relocation | |
| 659 of the PCH file would be required. */ | |
| 660 | |
| 661 int | |
| 662 default_gt_pch_use_address (void *base, size_t size, int fd ATTRIBUTE_UNUSED, | |
| 663 size_t offset ATTRIBUTE_UNUSED) | |
| 664 { | |
| 665 void *addr = xmalloc (size); | |
| 666 return (addr == base) - 1; | |
| 667 } | |
| 668 | |
| 669 /* Default version of HOST_HOOKS_GT_PCH_GET_ADDRESS. Return the | |
| 670 alignment required for allocating virtual memory. Usually this is the | |
| 671 same as pagesize. */ | |
| 672 | |
| 673 size_t | |
| 674 default_gt_pch_alloc_granularity (void) | |
| 675 { | |
| 111 | 676 return getpagesize (); |
| 0 | 677 } |
| 678 | |
| 679 #if HAVE_MMAP_FILE | |
| 680 /* Default version of HOST_HOOKS_GT_PCH_GET_ADDRESS when mmap is present. | |
| 681 We temporarily allocate SIZE bytes, and let the kernel place the data | |
| 682 wherever it will. If it worked, that's our spot, if not we're likely | |
| 683 to be in trouble. */ | |
| 684 | |
| 685 void * | |
| 686 mmap_gt_pch_get_address (size_t size, int fd) | |
| 687 { | |
| 688 void *ret; | |
| 689 | |
| 690 ret = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); | |
| 691 if (ret == (void *) MAP_FAILED) | |
| 692 ret = NULL; | |
| 693 else | |
| 694 munmap ((caddr_t) ret, size); | |
| 695 | |
| 696 return ret; | |
| 697 } | |
| 698 | |
| 699 /* Default version of HOST_HOOKS_GT_PCH_USE_ADDRESS when mmap is present. | |
|
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700 Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at |
| 0 | 701 mapping the data at BASE, -1 if we couldn't. |
| 702 | |
| 703 This version assumes that the kernel honors the START operand of mmap | |
| 704 even without MAP_FIXED if START through START+SIZE are not currently | |
| 705 mapped with something. */ | |
| 706 | |
| 707 int | |
| 708 mmap_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) | |
| 709 { | |
| 710 void *addr; | |
| 711 | |
| 712 /* We're called with size == 0 if we're not planning to load a PCH | |
| 713 file at all. This allows the hook to free any static space that | |
| 714 we might have allocated at link time. */ | |
| 715 if (size == 0) | |
| 716 return -1; | |
| 717 | |
| 718 addr = mmap ((caddr_t) base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, | |
| 719 fd, offset); | |
| 720 | |
| 721 return addr == base ? 1 : -1; | |
| 722 } | |
| 723 #endif /* HAVE_MMAP_FILE */ | |
| 724 | |
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725 #if !defined ENABLE_GC_CHECKING && !defined ENABLE_GC_ALWAYS_COLLECT |
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726 |
| 0 | 727 /* Modify the bound based on rlimits. */ |
| 728 static double | |
| 729 ggc_rlimit_bound (double limit) | |
| 730 { | |
| 731 #if defined(HAVE_GETRLIMIT) | |
| 732 struct rlimit rlim; | |
| 733 # if defined (RLIMIT_AS) | |
| 734 /* RLIMIT_AS is what POSIX says is the limit on mmap. Presumably | |
| 735 any OS which has RLIMIT_AS also has a working mmap that GCC will use. */ | |
| 736 if (getrlimit (RLIMIT_AS, &rlim) == 0 | |
| 737 && rlim.rlim_cur != (rlim_t) RLIM_INFINITY | |
| 738 && rlim.rlim_cur < limit) | |
| 739 limit = rlim.rlim_cur; | |
| 740 # elif defined (RLIMIT_DATA) | |
| 741 /* ... but some older OSs bound mmap based on RLIMIT_DATA, or we | |
| 742 might be on an OS that has a broken mmap. (Others don't bound | |
| 743 mmap at all, apparently.) */ | |
| 744 if (getrlimit (RLIMIT_DATA, &rlim) == 0 | |
| 745 && rlim.rlim_cur != (rlim_t) RLIM_INFINITY | |
| 746 && rlim.rlim_cur < limit | |
| 747 /* Darwin has this horribly bogus default setting of | |
| 748 RLIMIT_DATA, to 6144Kb. No-one notices because RLIMIT_DATA | |
| 749 appears to be ignored. Ignore such silliness. If a limit | |
| 750 this small was actually effective for mmap, GCC wouldn't even | |
| 751 start up. */ | |
| 752 && rlim.rlim_cur >= 8 * 1024 * 1024) | |
| 753 limit = rlim.rlim_cur; | |
| 754 # endif /* RLIMIT_AS or RLIMIT_DATA */ | |
| 755 #endif /* HAVE_GETRLIMIT */ | |
| 756 | |
| 757 return limit; | |
| 758 } | |
| 759 | |
| 760 /* Heuristic to set a default for GGC_MIN_EXPAND. */ | |
|
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761 static int |
| 0 | 762 ggc_min_expand_heuristic (void) |
| 763 { | |
| 111 | 764 double min_expand = physmem_total (); |
| 0 | 765 |
| 766 /* Adjust for rlimits. */ | |
| 767 min_expand = ggc_rlimit_bound (min_expand); | |
| 768 | |
| 769 /* The heuristic is a percentage equal to 30% + 70%*(RAM/1GB), yielding | |
| 770 a lower bound of 30% and an upper bound of 100% (when RAM >= 1GB). */ | |
| 771 min_expand /= 1024*1024*1024; | |
| 772 min_expand *= 70; | |
| 773 min_expand = MIN (min_expand, 70); | |
| 774 min_expand += 30; | |
| 775 | |
| 776 return min_expand; | |
| 777 } | |
| 778 | |
| 779 /* Heuristic to set a default for GGC_MIN_HEAPSIZE. */ | |
|
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780 static int |
| 0 | 781 ggc_min_heapsize_heuristic (void) |
| 782 { | |
| 111 | 783 double phys_kbytes = physmem_total (); |
| 0 | 784 double limit_kbytes = ggc_rlimit_bound (phys_kbytes * 2); |
| 785 | |
| 786 phys_kbytes /= 1024; /* Convert to Kbytes. */ | |
| 787 limit_kbytes /= 1024; | |
| 788 | |
| 789 /* The heuristic is RAM/8, with a lower bound of 4M and an upper | |
| 790 bound of 128M (when RAM >= 1GB). */ | |
| 791 phys_kbytes /= 8; | |
| 792 | |
| 793 #if defined(HAVE_GETRLIMIT) && defined (RLIMIT_RSS) | |
|
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794 /* Try not to overrun the RSS limit while doing garbage collection. |
| 0 | 795 The RSS limit is only advisory, so no margin is subtracted. */ |
| 796 { | |
| 797 struct rlimit rlim; | |
| 798 if (getrlimit (RLIMIT_RSS, &rlim) == 0 | |
| 799 && rlim.rlim_cur != (rlim_t) RLIM_INFINITY) | |
| 800 phys_kbytes = MIN (phys_kbytes, rlim.rlim_cur / 1024); | |
| 801 } | |
| 802 # endif | |
| 803 | |
| 804 /* Don't blindly run over our data limit; do GC at least when the | |
| 805 *next* GC would be within 20Mb of the limit or within a quarter of | |
| 806 the limit, whichever is larger. If GCC does hit the data limit, | |
| 807 compilation will fail, so this tries to be conservative. */ | |
| 808 limit_kbytes = MAX (0, limit_kbytes - MAX (limit_kbytes / 4, 20 * 1024)); | |
|
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809 limit_kbytes = (limit_kbytes * 100) / (110 + ggc_min_expand_heuristic ()); |
| 0 | 810 phys_kbytes = MIN (phys_kbytes, limit_kbytes); |
| 811 | |
| 812 phys_kbytes = MAX (phys_kbytes, 4 * 1024); | |
| 813 phys_kbytes = MIN (phys_kbytes, 128 * 1024); | |
| 814 | |
| 815 return phys_kbytes; | |
| 816 } | |
|
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817 #endif |
| 0 | 818 |
| 819 void | |
| 820 init_ggc_heuristics (void) | |
| 821 { | |
| 822 #if !defined ENABLE_GC_CHECKING && !defined ENABLE_GC_ALWAYS_COLLECT | |
|
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823 set_default_param_value (GGC_MIN_EXPAND, ggc_min_expand_heuristic ()); |
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824 set_default_param_value (GGC_MIN_HEAPSIZE, ggc_min_heapsize_heuristic ()); |
| 0 | 825 #endif |
| 826 } | |
| 827 | |
| 111 | 828 /* GGC memory usage. */ |
| 829 struct ggc_usage: public mem_usage | |
| 0 | 830 { |
| 111 | 831 /* Default constructor. */ |
| 832 ggc_usage (): m_freed (0), m_collected (0), m_overhead (0) {} | |
| 833 /* Constructor. */ | |
| 834 ggc_usage (size_t allocated, size_t times, size_t peak, | |
| 835 size_t freed, size_t collected, size_t overhead) | |
| 836 : mem_usage (allocated, times, peak), | |
| 837 m_freed (freed), m_collected (collected), m_overhead (overhead) {} | |
| 838 | |
| 839 /* Comparison operator. */ | |
| 840 inline bool | |
| 841 operator< (const ggc_usage &second) const | |
| 842 { | |
| 843 return (get_balance () == second.get_balance () ? | |
| 844 (m_peak == second.m_peak ? m_times < second.m_times | |
| 845 : m_peak < second.m_peak) | |
| 846 : get_balance () < second.get_balance ()); | |
| 847 } | |
| 848 | |
| 849 /* Register overhead of ALLOCATED and OVERHEAD bytes. */ | |
| 850 inline void | |
| 851 register_overhead (size_t allocated, size_t overhead) | |
| 852 { | |
| 853 m_allocated += allocated; | |
| 854 m_overhead += overhead; | |
| 855 m_times++; | |
| 856 } | |
| 857 | |
| 858 /* Release overhead of SIZE bytes. */ | |
| 859 inline void | |
| 860 release_overhead (size_t size) | |
| 861 { | |
| 862 m_freed += size; | |
| 863 } | |
| 864 | |
| 865 /* Sum the usage with SECOND usage. */ | |
| 866 ggc_usage | |
| 867 operator+ (const ggc_usage &second) | |
| 868 { | |
| 869 return ggc_usage (m_allocated + second.m_allocated, | |
| 870 m_times + second.m_times, | |
| 871 m_peak + second.m_peak, | |
| 872 m_freed + second.m_freed, | |
| 873 m_collected + second.m_collected, | |
| 874 m_overhead + second.m_overhead); | |
| 875 } | |
| 876 | |
| 877 /* Dump usage with PREFIX, where TOTAL is sum of all rows. */ | |
| 878 inline void | |
| 879 dump (const char *prefix, ggc_usage &total) const | |
| 880 { | |
| 881 long balance = get_balance (); | |
| 882 fprintf (stderr, | |
| 883 "%-48s %10li:%5.1f%%%10li:%5.1f%%" | |
| 884 "%10li:%5.1f%%%10li:%5.1f%%%10li\n", | |
| 885 prefix, (long)m_collected, | |
| 886 get_percent (m_collected, total.m_collected), | |
| 887 (long)m_freed, get_percent (m_freed, total.m_freed), | |
| 888 (long)balance, get_percent (balance, total.get_balance ()), | |
| 889 (long)m_overhead, get_percent (m_overhead, total.m_overhead), | |
| 890 (long)m_times); | |
| 891 } | |
| 892 | |
| 893 /* Dump usage coupled to LOC location, where TOTAL is sum of all rows. */ | |
| 894 inline void | |
| 895 dump (mem_location *loc, ggc_usage &total) const | |
| 896 { | |
| 897 char *location_string = loc->to_string (); | |
| 898 | |
| 899 dump (location_string, total); | |
| 900 | |
| 901 free (location_string); | |
| 902 } | |
| 903 | |
| 904 /* Dump footer. */ | |
| 905 inline void | |
| 906 dump_footer () | |
| 907 { | |
| 908 print_dash_line (); | |
| 909 dump ("Total", *this); | |
| 910 print_dash_line (); | |
| 911 } | |
| 912 | |
| 913 /* Get balance which is GGC allocation leak. */ | |
| 914 inline long | |
| 915 get_balance () const | |
| 916 { | |
| 917 return m_allocated + m_overhead - m_collected - m_freed; | |
| 918 } | |
| 919 | |
| 920 typedef std::pair<mem_location *, ggc_usage *> mem_pair_t; | |
| 921 | |
| 922 /* Compare wrapper used by qsort method. */ | |
| 923 static int | |
| 924 compare (const void *first, const void *second) | |
| 925 { | |
| 926 const mem_pair_t f = *(const mem_pair_t *)first; | |
| 927 const mem_pair_t s = *(const mem_pair_t *)second; | |
| 928 | |
| 929 return (*f.second) < (*s.second); | |
| 930 } | |
| 931 | |
| 932 /* Compare rows in final GGC summary dump. */ | |
| 933 static int | |
| 934 compare_final (const void *first, const void *second) | |
| 935 { | |
| 936 typedef std::pair<mem_location *, ggc_usage *> mem_pair_t; | |
| 937 | |
| 938 const ggc_usage *f = ((const mem_pair_t *)first)->second; | |
| 939 const ggc_usage *s = ((const mem_pair_t *)second)->second; | |
| 940 | |
| 941 size_t a = f->m_allocated + f->m_overhead - f->m_freed; | |
| 942 size_t b = s->m_allocated + s->m_overhead - s->m_freed; | |
| 943 | |
| 944 return a == b ? 0 : (a < b ? 1 : -1); | |
| 945 } | |
| 946 | |
| 947 /* Dump header with NAME. */ | |
| 948 static inline void | |
| 949 dump_header (const char *name) | |
| 950 { | |
| 951 fprintf (stderr, "%-48s %11s%17s%17s%16s%17s\n", name, "Garbage", "Freed", | |
| 952 "Leak", "Overhead", "Times"); | |
| 953 print_dash_line (); | |
| 954 } | |
| 955 | |
| 956 /* Freed memory in bytes. */ | |
| 957 size_t m_freed; | |
| 958 /* Collected memory in bytes. */ | |
| 959 size_t m_collected; | |
| 960 /* Overhead memory in bytes. */ | |
| 961 size_t m_overhead; | |
| 0 | 962 }; |
| 963 | |
| 111 | 964 /* GCC memory description. */ |
| 965 static mem_alloc_description<ggc_usage> ggc_mem_desc; | |
| 0 | 966 |
| 111 | 967 /* Dump per-site memory statistics. */ |
| 0 | 968 |
| 111 | 969 void |
| 970 dump_ggc_loc_statistics (bool final) | |
| 0 | 971 { |
| 111 | 972 if (! GATHER_STATISTICS) |
| 973 return; | |
| 0 | 974 |
| 111 | 975 ggc_force_collect = true; |
| 976 ggc_collect (); | |
| 0 | 977 |
| 111 | 978 ggc_mem_desc.dump (GGC_ORIGIN, final ? ggc_usage::compare_final : NULL); |
| 0 | 979 |
| 111 | 980 ggc_force_collect = false; |
| 0 | 981 } |
| 982 | |
| 983 /* Record ALLOCATED and OVERHEAD bytes to descriptor NAME:LINE (FUNCTION). */ | |
| 984 void | |
| 111 | 985 ggc_record_overhead (size_t allocated, size_t overhead, void *ptr MEM_STAT_DECL) |
| 0 | 986 { |
| 111 | 987 ggc_usage *usage = ggc_mem_desc.register_descriptor (ptr, GGC_ORIGIN, false |
| 988 FINAL_PASS_MEM_STAT); | |
| 0 | 989 |
| 111 | 990 ggc_mem_desc.register_object_overhead (usage, allocated + overhead, ptr); |
| 991 usage->register_overhead (allocated, overhead); | |
| 0 | 992 } |
| 993 | |
| 111 | 994 /* Notice that the pointer has been freed. */ |
| 995 void | |
| 996 ggc_free_overhead (void *ptr) | |
| 0 | 997 { |
| 111 | 998 ggc_mem_desc.release_object_overhead (ptr); |
| 0 | 999 } |
| 1000 | |
| 1001 /* After live values has been marked, walk all recorded pointers and see if | |
| 1002 they are still live. */ | |
| 1003 void | |
| 1004 ggc_prune_overhead_list (void) | |
| 1005 { | |
| 111 | 1006 typedef hash_map<const void *, std::pair<ggc_usage *, size_t > > map_t; |
| 0 | 1007 |
| 111 | 1008 map_t::iterator it = ggc_mem_desc.m_reverse_object_map->begin (); |
| 0 | 1009 |
| 111 | 1010 for (; it != ggc_mem_desc.m_reverse_object_map->end (); ++it) |
| 1011 if (!ggc_marked_p ((*it).first)) | |
| 1012 (*it).second.first->m_collected += (*it).second.second; | |
| 0 | 1013 |
| 111 | 1014 delete ggc_mem_desc.m_reverse_object_map; |
| 1015 ggc_mem_desc.m_reverse_object_map = new map_t (13, false, false); | |
| 0 | 1016 } |