Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.cpp @ 1563:1a5913bf5e19
6951083: oops and relocations should part of nmethod not CodeBlob
Summary: This moves the oops from Codeblob to nmethod.
Reviewed-by: kvn, never
| author | twisti |
|---|---|
| date | Thu, 20 May 2010 06:34:23 -0700 |
| parents | bfe29ec02863 |
| children | e9ff18c4ace7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_codeCache.cpp.incl" | |
| 27 | |
| 28 // Helper class for printing in CodeCache | |
| 29 | |
| 30 class CodeBlob_sizes { | |
| 31 private: | |
| 32 int count; | |
| 33 int total_size; | |
| 34 int header_size; | |
| 35 int code_size; | |
| 36 int stub_size; | |
| 37 int relocation_size; | |
| 38 int scopes_oop_size; | |
| 39 int scopes_data_size; | |
| 40 int scopes_pcs_size; | |
| 41 | |
| 42 public: | |
| 43 CodeBlob_sizes() { | |
| 44 count = 0; | |
| 45 total_size = 0; | |
| 46 header_size = 0; | |
| 47 code_size = 0; | |
| 48 stub_size = 0; | |
| 49 relocation_size = 0; | |
| 50 scopes_oop_size = 0; | |
| 51 scopes_data_size = 0; | |
| 52 scopes_pcs_size = 0; | |
| 53 } | |
| 54 | |
| 55 int total() { return total_size; } | |
| 56 bool is_empty() { return count == 0; } | |
| 57 | |
| 58 void print(const char* title) { | |
| 59 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", | |
| 60 count, | |
| 61 title, | |
| 62 total() / K, | |
| 63 header_size * 100 / total_size, | |
| 64 relocation_size * 100 / total_size, | |
| 65 code_size * 100 / total_size, | |
| 66 stub_size * 100 / total_size, | |
| 67 scopes_oop_size * 100 / total_size, | |
| 68 scopes_data_size * 100 / total_size, | |
| 69 scopes_pcs_size * 100 / total_size); | |
| 70 } | |
| 71 | |
| 72 void add(CodeBlob* cb) { | |
| 73 count++; | |
| 74 total_size += cb->size(); | |
| 75 header_size += cb->header_size(); | |
| 76 relocation_size += cb->relocation_size(); | |
| 77 if (cb->is_nmethod()) { | |
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78 nmethod* nm = cb->as_nmethod_or_null(); |
| 0 | 79 code_size += nm->code_size(); |
| 80 stub_size += nm->stub_size(); | |
| 81 | |
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82 scopes_oop_size += nm->oops_size(); |
| 0 | 83 scopes_data_size += nm->scopes_data_size(); |
| 84 scopes_pcs_size += nm->scopes_pcs_size(); | |
| 85 } else { | |
| 86 code_size += cb->instructions_size(); | |
| 87 } | |
| 88 } | |
| 89 }; | |
| 90 | |
| 91 | |
| 92 // CodeCache implementation | |
| 93 | |
| 94 CodeHeap * CodeCache::_heap = new CodeHeap(); | |
| 95 int CodeCache::_number_of_blobs = 0; | |
| 96 int CodeCache::_number_of_nmethods_with_dependencies = 0; | |
| 97 bool CodeCache::_needs_cache_clean = false; | |
| 989 | 98 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
| 1202 | 99 nmethod* CodeCache::_saved_nmethods = NULL; |
| 0 | 100 |
| 101 | |
| 102 CodeBlob* CodeCache::first() { | |
| 103 assert_locked_or_safepoint(CodeCache_lock); | |
| 104 return (CodeBlob*)_heap->first(); | |
| 105 } | |
| 106 | |
| 107 | |
| 108 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
| 109 assert_locked_or_safepoint(CodeCache_lock); | |
| 110 return (CodeBlob*)_heap->next(cb); | |
| 111 } | |
| 112 | |
| 113 | |
| 114 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
| 115 assert_locked_or_safepoint(CodeCache_lock); | |
| 116 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
| 117 return cb; | |
| 118 } | |
| 119 | |
| 120 | |
| 121 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
| 122 assert_locked_or_safepoint(CodeCache_lock); | |
| 123 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
| 124 return (nmethod*)cb; | |
| 125 } | |
| 126 | |
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127 nmethod* CodeCache::first_nmethod() { |
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128 assert_locked_or_safepoint(CodeCache_lock); |
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129 CodeBlob* cb = first(); |
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130 while (cb != NULL && !cb->is_nmethod()) { |
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131 cb = next(cb); |
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132 } |
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133 return (nmethod*)cb; |
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134 } |
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135 |
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136 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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137 assert_locked_or_safepoint(CodeCache_lock); |
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138 cb = next(cb); |
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139 while (cb != NULL && !cb->is_nmethod()) { |
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140 cb = next(cb); |
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141 } |
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142 return (nmethod*)cb; |
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143 } |
| 0 | 144 |
| 145 CodeBlob* CodeCache::allocate(int size) { | |
| 146 // Do not seize the CodeCache lock here--if the caller has not | |
| 147 // already done so, we are going to lose bigtime, since the code | |
| 148 // cache will contain a garbage CodeBlob until the caller can | |
| 149 // run the constructor for the CodeBlob subclass he is busy | |
| 150 // instantiating. | |
| 151 guarantee(size >= 0, "allocation request must be reasonable"); | |
| 152 assert_locked_or_safepoint(CodeCache_lock); | |
| 153 CodeBlob* cb = NULL; | |
| 154 _number_of_blobs++; | |
| 155 while (true) { | |
| 156 cb = (CodeBlob*)_heap->allocate(size); | |
| 157 if (cb != NULL) break; | |
| 158 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
| 159 // Expansion failed | |
| 160 return NULL; | |
| 161 } | |
| 162 if (PrintCodeCacheExtension) { | |
| 163 ResourceMark rm; | |
| 164 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", | |
| 165 (intptr_t)_heap->begin(), (intptr_t)_heap->end(), | |
| 166 (address)_heap->end() - (address)_heap->begin()); | |
| 167 } | |
| 168 } | |
| 169 verify_if_often(); | |
| 989 | 170 print_trace("allocation", cb, size); |
| 0 | 171 return cb; |
| 172 } | |
| 173 | |
| 174 void CodeCache::free(CodeBlob* cb) { | |
| 175 assert_locked_or_safepoint(CodeCache_lock); | |
| 176 verify_if_often(); | |
| 177 | |
| 989 | 178 print_trace("free", cb); |
| 0 | 179 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) { |
| 180 _number_of_nmethods_with_dependencies--; | |
| 181 } | |
| 182 _number_of_blobs--; | |
| 183 | |
| 184 _heap->deallocate(cb); | |
| 185 | |
| 186 verify_if_often(); | |
| 187 assert(_number_of_blobs >= 0, "sanity check"); | |
| 188 } | |
| 189 | |
| 190 | |
| 191 void CodeCache::commit(CodeBlob* cb) { | |
| 192 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
| 193 assert_locked_or_safepoint(CodeCache_lock); | |
| 194 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) { | |
| 195 _number_of_nmethods_with_dependencies++; | |
| 196 } | |
| 197 // flush the hardware I-cache | |
| 198 ICache::invalidate_range(cb->instructions_begin(), cb->instructions_size()); | |
| 199 } | |
| 200 | |
| 201 | |
| 202 void CodeCache::flush() { | |
| 203 assert_locked_or_safepoint(CodeCache_lock); | |
| 204 Unimplemented(); | |
| 205 } | |
| 206 | |
| 207 | |
| 208 // Iteration over CodeBlobs | |
| 209 | |
| 210 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
| 211 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
| 212 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
| 213 | |
| 214 | |
| 215 bool CodeCache::contains(void *p) { | |
| 216 // It should be ok to call contains without holding a lock | |
| 217 return _heap->contains(p); | |
| 218 } | |
| 219 | |
| 220 | |
| 221 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
| 222 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
| 223 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
| 224 CodeBlob* CodeCache::find_blob(void* start) { | |
| 225 CodeBlob* result = find_blob_unsafe(start); | |
| 226 if (result == NULL) return NULL; | |
| 227 // We could potientially look up non_entrant methods | |
| 228 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
| 229 return result; | |
| 230 } | |
| 231 | |
| 232 nmethod* CodeCache::find_nmethod(void* start) { | |
| 233 CodeBlob *cb = find_blob(start); | |
| 234 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
| 235 return (nmethod*)cb; | |
| 236 } | |
| 237 | |
| 238 | |
| 239 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
| 240 assert_locked_or_safepoint(CodeCache_lock); | |
| 241 FOR_ALL_BLOBS(p) { | |
| 242 f(p); | |
| 243 } | |
| 244 } | |
| 245 | |
| 246 | |
| 247 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
| 248 assert_locked_or_safepoint(CodeCache_lock); | |
| 249 FOR_ALL_BLOBS(nm) { | |
| 250 if (nm->is_nmethod()) f((nmethod*)nm); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 | |
| 255 int CodeCache::alignment_unit() { | |
| 256 return (int)_heap->alignment_unit(); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 int CodeCache::alignment_offset() { | |
| 261 return (int)_heap->alignment_offset(); | |
| 262 } | |
| 263 | |
| 264 | |
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265 // Mark nmethods for unloading if they contain otherwise unreachable |
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266 // oops. |
| 0 | 267 void CodeCache::do_unloading(BoolObjectClosure* is_alive, |
| 268 OopClosure* keep_alive, | |
| 269 bool unloading_occurred) { | |
| 270 assert_locked_or_safepoint(CodeCache_lock); | |
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271 FOR_ALL_ALIVE_NMETHODS(nm) { |
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272 nm->do_unloading(is_alive, keep_alive, unloading_occurred); |
| 0 | 273 } |
| 274 } | |
| 275 | |
| 989 | 276 void CodeCache::blobs_do(CodeBlobClosure* f) { |
| 0 | 277 assert_locked_or_safepoint(CodeCache_lock); |
| 278 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 989 | 279 f->do_code_blob(cb); |
| 280 | |
| 281 #ifdef ASSERT | |
| 282 if (cb->is_nmethod()) | |
| 283 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
| 284 #endif //ASSERT | |
| 0 | 285 } |
| 286 } | |
| 287 | |
| 989 | 288 // Walk the list of methods which might contain non-perm oops. |
| 289 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
| 290 assert_locked_or_safepoint(CodeCache_lock); | |
| 291 debug_only(mark_scavenge_root_nmethods()); | |
| 292 | |
| 293 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 294 debug_only(cur->clear_scavenge_root_marked()); | |
| 295 assert(cur->scavenge_root_not_marked(), ""); | |
| 296 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 297 | |
| 298 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
| 299 #ifndef PRODUCT | |
| 300 if (TraceScavenge) { | |
| 301 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
| 302 } | |
| 303 #endif //PRODUCT | |
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304 if (is_live) { |
| 989 | 305 // Perform cur->oops_do(f), maybe just once per nmethod. |
| 306 f->do_code_blob(cur); | |
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307 cur->fix_oop_relocations(); |
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308 } |
| 989 | 309 } |
| 310 | |
| 311 // Check for stray marks. | |
| 312 debug_only(verify_perm_nmethods(NULL)); | |
| 313 } | |
| 314 | |
| 315 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
| 316 assert_locked_or_safepoint(CodeCache_lock); | |
| 317 nm->set_on_scavenge_root_list(); | |
| 318 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
| 319 set_scavenge_root_nmethods(nm); | |
| 320 print_trace("add_scavenge_root", nm); | |
| 321 } | |
| 322 | |
| 323 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
| 324 assert_locked_or_safepoint(CodeCache_lock); | |
| 325 print_trace("drop_scavenge_root", nm); | |
| 326 nmethod* last = NULL; | |
| 327 nmethod* cur = scavenge_root_nmethods(); | |
| 328 while (cur != NULL) { | |
| 329 nmethod* next = cur->scavenge_root_link(); | |
| 330 if (cur == nm) { | |
| 331 if (last != NULL) | |
| 332 last->set_scavenge_root_link(next); | |
| 333 else set_scavenge_root_nmethods(next); | |
| 334 nm->set_scavenge_root_link(NULL); | |
| 335 nm->clear_on_scavenge_root_list(); | |
| 336 return; | |
| 337 } | |
| 338 last = cur; | |
| 339 cur = next; | |
| 340 } | |
| 341 assert(false, "should have been on list"); | |
| 342 } | |
| 343 | |
| 344 void CodeCache::prune_scavenge_root_nmethods() { | |
| 345 assert_locked_or_safepoint(CodeCache_lock); | |
| 346 debug_only(mark_scavenge_root_nmethods()); | |
| 347 | |
| 348 nmethod* last = NULL; | |
| 349 nmethod* cur = scavenge_root_nmethods(); | |
| 350 while (cur != NULL) { | |
| 351 nmethod* next = cur->scavenge_root_link(); | |
| 352 debug_only(cur->clear_scavenge_root_marked()); | |
| 353 assert(cur->scavenge_root_not_marked(), ""); | |
| 354 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 355 | |
| 356 if (!cur->is_zombie() && !cur->is_unloaded() | |
| 357 && cur->detect_scavenge_root_oops()) { | |
| 358 // Keep it. Advance 'last' to prevent deletion. | |
| 359 last = cur; | |
| 360 } else { | |
| 361 // Prune it from the list, so we don't have to look at it any more. | |
| 362 print_trace("prune_scavenge_root", cur); | |
| 363 cur->set_scavenge_root_link(NULL); | |
| 364 cur->clear_on_scavenge_root_list(); | |
| 365 if (last != NULL) | |
| 366 last->set_scavenge_root_link(next); | |
| 367 else set_scavenge_root_nmethods(next); | |
| 368 } | |
| 369 cur = next; | |
| 370 } | |
| 371 | |
| 372 // Check for stray marks. | |
| 373 debug_only(verify_perm_nmethods(NULL)); | |
| 374 } | |
| 375 | |
| 376 #ifndef PRODUCT | |
| 377 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
| 378 // While we are here, verify the integrity of the list. | |
| 379 mark_scavenge_root_nmethods(); | |
| 380 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 381 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 382 cur->clear_scavenge_root_marked(); | |
| 383 } | |
| 384 verify_perm_nmethods(f); | |
| 385 } | |
| 386 | |
| 387 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
| 388 void CodeCache::mark_scavenge_root_nmethods() { | |
| 389 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 390 if (cb->is_nmethod()) { | |
| 391 nmethod *nm = (nmethod*)cb; | |
| 392 assert(nm->scavenge_root_not_marked(), "clean state"); | |
| 393 if (nm->on_scavenge_root_list()) | |
| 394 nm->set_scavenge_root_marked(); | |
| 395 } | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 // If the closure is given, run it on the unlisted nmethods. | |
| 400 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
| 401 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
| 402 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 403 bool call_f = (f_or_null != NULL); | |
| 404 if (cb->is_nmethod()) { | |
| 405 nmethod *nm = (nmethod*)cb; | |
| 406 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
| 407 if (nm->on_scavenge_root_list()) | |
| 408 call_f = false; // don't show this one to the client | |
| 409 nm->verify_scavenge_root_oops(); | |
| 410 } else { | |
| 411 call_f = false; // not an nmethod | |
| 412 } | |
| 413 if (call_f) f_or_null->do_code_blob(cb); | |
| 414 } | |
| 415 } | |
| 416 #endif //PRODUCT | |
| 417 | |
| 1202 | 418 |
| 419 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) { | |
| 420 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 421 nmethod* saved = _saved_nmethods; | |
| 422 nmethod* prev = NULL; | |
| 423 while (saved != NULL) { | |
| 424 if (saved->is_in_use() && saved->method() == m) { | |
| 425 if (prev != NULL) { | |
| 426 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 427 } else { | |
| 428 _saved_nmethods = saved->saved_nmethod_link(); | |
| 429 } | |
| 430 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
| 431 saved->set_speculatively_disconnected(false); | |
| 432 saved->set_saved_nmethod_link(NULL); | |
| 433 if (PrintMethodFlushing) { | |
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434 saved->print_on(tty, " ### nmethod is reconnected\n"); |
| 1202 | 435 } |
| 436 if (LogCompilation && (xtty != NULL)) { | |
| 437 ttyLocker ttyl; | |
| 438 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
| 439 xtty->method(methodOop(m)); | |
| 440 xtty->stamp(); | |
| 441 xtty->end_elem(); | |
| 442 } | |
| 443 return saved; | |
| 444 } | |
| 445 prev = saved; | |
| 446 saved = saved->saved_nmethod_link(); | |
| 447 } | |
| 448 return NULL; | |
| 449 } | |
| 450 | |
| 451 void CodeCache::remove_saved_code(nmethod* nm) { | |
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452 // For conc swpr this will be called with CodeCache_lock taken by caller |
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453 assert_locked_or_safepoint(CodeCache_lock); |
| 1202 | 454 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
| 455 nmethod* saved = _saved_nmethods; | |
| 456 nmethod* prev = NULL; | |
| 457 while (saved != NULL) { | |
| 458 if (saved == nm) { | |
| 459 if (prev != NULL) { | |
| 460 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 461 } else { | |
| 462 _saved_nmethods = saved->saved_nmethod_link(); | |
| 463 } | |
| 464 if (LogCompilation && (xtty != NULL)) { | |
| 465 ttyLocker ttyl; | |
| 466 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
| 467 xtty->stamp(); | |
| 468 xtty->end_elem(); | |
| 469 } | |
| 470 return; | |
| 471 } | |
| 472 prev = saved; | |
| 473 saved = saved->saved_nmethod_link(); | |
| 474 } | |
| 475 ShouldNotReachHere(); | |
| 476 } | |
| 477 | |
| 478 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
| 479 assert_locked_or_safepoint(CodeCache_lock); | |
| 480 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
| 481 nm->set_saved_nmethod_link(_saved_nmethods); | |
| 482 _saved_nmethods = nm; | |
| 483 if (PrintMethodFlushing) { | |
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484 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
| 1202 | 485 } |
| 486 if (LogCompilation && (xtty != NULL)) { | |
| 487 ttyLocker ttyl; | |
| 488 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
| 489 xtty->method(methodOop(nm->method())); | |
| 490 xtty->stamp(); | |
| 491 xtty->end_elem(); | |
| 492 } | |
| 493 nm->method()->clear_code(); | |
| 494 nm->set_speculatively_disconnected(true); | |
| 495 } | |
| 496 | |
| 497 | |
| 0 | 498 void CodeCache::gc_prologue() { |
| 989 | 499 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
| 0 | 500 } |
| 501 | |
| 502 | |
| 503 void CodeCache::gc_epilogue() { | |
| 504 assert_locked_or_safepoint(CodeCache_lock); | |
| 505 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 506 if (cb->is_nmethod()) { | |
| 507 nmethod *nm = (nmethod*)cb; | |
| 508 assert(!nm->is_unloaded(), "Tautology"); | |
| 509 if (needs_cache_clean()) { | |
| 510 nm->cleanup_inline_caches(); | |
| 511 } | |
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512 DEBUG_ONLY(nm->verify()); |
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513 nm->fix_oop_relocations(); |
| 0 | 514 } |
| 515 } | |
| 516 set_needs_cache_clean(false); | |
| 989 | 517 prune_scavenge_root_nmethods(); |
| 518 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
| 0 | 519 } |
| 520 | |
| 521 | |
| 522 address CodeCache::first_address() { | |
| 523 assert_locked_or_safepoint(CodeCache_lock); | |
| 524 return (address)_heap->begin(); | |
| 525 } | |
| 526 | |
| 527 | |
| 528 address CodeCache::last_address() { | |
| 529 assert_locked_or_safepoint(CodeCache_lock); | |
| 530 return (address)_heap->end(); | |
| 531 } | |
| 532 | |
| 533 | |
| 534 void icache_init(); | |
| 535 | |
| 536 void CodeCache::initialize() { | |
| 537 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
| 538 #ifdef COMPILER2 | |
| 539 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
| 540 #endif | |
| 541 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
| 542 // This was originally just a check of the alignment, causing failure, instead, round | |
| 543 // the code cache to the page size. In particular, Solaris is moving to a larger | |
| 544 // default page size. | |
| 545 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
| 546 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
| 547 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
| 548 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
| 549 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
| 550 } | |
| 551 | |
| 552 MemoryService::add_code_heap_memory_pool(_heap); | |
| 553 | |
| 554 // Initialize ICache flush mechanism | |
| 555 // This service is needed for os::register_code_area | |
| 556 icache_init(); | |
| 557 | |
| 558 // Give OS a chance to register generated code area. | |
| 559 // This is used on Windows 64 bit platforms to register | |
| 560 // Structured Exception Handlers for our generated code. | |
| 561 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
| 562 } | |
| 563 | |
| 564 | |
| 565 void codeCache_init() { | |
| 566 CodeCache::initialize(); | |
| 567 } | |
| 568 | |
| 569 //------------------------------------------------------------------------------------------------ | |
| 570 | |
| 571 int CodeCache::number_of_nmethods_with_dependencies() { | |
| 572 return _number_of_nmethods_with_dependencies; | |
| 573 } | |
| 574 | |
| 575 void CodeCache::clear_inline_caches() { | |
| 576 assert_locked_or_safepoint(CodeCache_lock); | |
| 577 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 578 nm->clear_inline_caches(); | |
| 579 } | |
| 580 } | |
| 581 | |
| 582 #ifndef PRODUCT | |
| 583 // used to keep track of how much time is spent in mark_for_deoptimization | |
| 584 static elapsedTimer dependentCheckTime; | |
| 585 static int dependentCheckCount = 0; | |
| 586 #endif // PRODUCT | |
| 587 | |
| 588 | |
| 589 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
| 590 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 591 | |
| 592 #ifndef PRODUCT | |
| 593 dependentCheckTime.start(); | |
| 594 dependentCheckCount++; | |
| 595 #endif // PRODUCT | |
| 596 | |
| 597 int number_of_marked_CodeBlobs = 0; | |
| 598 | |
| 599 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
| 600 | |
| 601 // then search the interfaces this class implements looking for nmethods | |
| 602 // which might be dependent of the fact that an interface only had one | |
| 603 // implementor. | |
| 604 | |
| 605 { No_Safepoint_Verifier nsv; | |
| 606 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
| 607 klassOop d = str.klass(); | |
| 608 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes); | |
| 609 } | |
| 610 } | |
| 611 | |
| 612 if (VerifyDependencies) { | |
| 613 // Turn off dependency tracing while actually testing deps. | |
| 614 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
| 615 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 616 if (!nm->is_marked_for_deoptimization() && | |
| 617 nm->check_all_dependencies()) { | |
| 618 ResourceMark rm; | |
| 619 tty->print_cr("Should have been marked for deoptimization:"); | |
| 620 changes.print(); | |
| 621 nm->print(); | |
| 622 nm->print_dependencies(); | |
| 623 } | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 #ifndef PRODUCT | |
| 628 dependentCheckTime.stop(); | |
| 629 #endif // PRODUCT | |
| 630 | |
| 631 return number_of_marked_CodeBlobs; | |
| 632 } | |
| 633 | |
| 634 | |
| 635 #ifdef HOTSWAP | |
| 636 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
| 637 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 638 int number_of_marked_CodeBlobs = 0; | |
| 639 | |
| 640 // Deoptimize all methods of the evolving class itself | |
| 641 objArrayOop old_methods = dependee->methods(); | |
| 642 for (int i = 0; i < old_methods->length(); i++) { | |
| 643 ResourceMark rm; | |
| 644 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 645 nmethod *nm = old_method->code(); | |
| 646 if (nm != NULL) { | |
| 647 nm->mark_for_deoptimization(); | |
| 648 number_of_marked_CodeBlobs++; | |
| 649 } | |
| 650 } | |
| 651 | |
| 652 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 653 if (nm->is_marked_for_deoptimization()) { | |
| 654 // ...Already marked in the previous pass; don't count it again. | |
| 655 } else if (nm->is_evol_dependent_on(dependee())) { | |
| 656 ResourceMark rm; | |
| 657 nm->mark_for_deoptimization(); | |
| 658 number_of_marked_CodeBlobs++; | |
| 659 } else { | |
| 660 // flush caches in case they refer to a redefined methodOop | |
| 661 nm->clear_inline_caches(); | |
| 662 } | |
| 663 } | |
| 664 | |
| 665 return number_of_marked_CodeBlobs; | |
| 666 } | |
| 667 #endif // HOTSWAP | |
| 668 | |
| 669 | |
| 670 // Deoptimize all methods | |
| 671 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
| 672 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 673 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 674 nm->mark_for_deoptimization(); | |
| 675 } | |
| 676 } | |
| 677 | |
| 678 | |
| 679 int CodeCache::mark_for_deoptimization(methodOop dependee) { | |
| 680 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 681 int number_of_marked_CodeBlobs = 0; | |
| 682 | |
| 683 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 684 if (nm->is_dependent_on_method(dependee)) { | |
| 685 ResourceMark rm; | |
| 686 nm->mark_for_deoptimization(); | |
| 687 number_of_marked_CodeBlobs++; | |
| 688 } | |
| 689 } | |
| 690 | |
| 691 return number_of_marked_CodeBlobs; | |
| 692 } | |
| 693 | |
| 694 void CodeCache::make_marked_nmethods_zombies() { | |
| 695 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 696 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 697 if (nm->is_marked_for_deoptimization()) { | |
| 698 | |
| 699 // If the nmethod has already been made non-entrant and it can be converted | |
| 700 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
| 701 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
| 702 // might be "entrant" and not on the stack and so could be zombied immediately | |
| 703 // but we can't tell because we don't track it on stack until it becomes | |
| 704 // non-entrant. | |
| 705 | |
| 706 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
| 707 nm->make_zombie(); | |
| 708 } else { | |
| 709 nm->make_not_entrant(); | |
| 710 } | |
| 711 } | |
| 712 } | |
| 713 } | |
| 714 | |
| 715 void CodeCache::make_marked_nmethods_not_entrant() { | |
| 716 assert_locked_or_safepoint(CodeCache_lock); | |
| 717 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 718 if (nm->is_marked_for_deoptimization()) { | |
| 719 nm->make_not_entrant(); | |
| 720 } | |
| 721 } | |
| 722 } | |
| 723 | |
| 724 void CodeCache::verify() { | |
| 725 _heap->verify(); | |
| 726 FOR_ALL_ALIVE_BLOBS(p) { | |
| 727 p->verify(); | |
| 728 } | |
| 729 } | |
| 730 | |
| 731 //------------------------------------------------------------------------------------------------ | |
| 732 // Non-product version | |
| 733 | |
| 734 #ifndef PRODUCT | |
| 735 | |
| 736 void CodeCache::verify_if_often() { | |
| 737 if (VerifyCodeCacheOften) { | |
| 738 _heap->verify(); | |
| 739 } | |
| 740 } | |
| 741 | |
| 989 | 742 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
| 743 if (PrintCodeCache2) { // Need to add a new flag | |
| 744 ResourceMark rm; | |
| 745 if (size == 0) size = cb->size(); | |
| 746 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
| 747 } | |
| 748 } | |
| 749 | |
| 0 | 750 void CodeCache::print_internals() { |
| 751 int nmethodCount = 0; | |
| 752 int runtimeStubCount = 0; | |
| 753 int adapterCount = 0; | |
| 754 int deoptimizationStubCount = 0; | |
| 755 int uncommonTrapStubCount = 0; | |
| 756 int bufferBlobCount = 0; | |
| 757 int total = 0; | |
| 758 int nmethodAlive = 0; | |
| 759 int nmethodNotEntrant = 0; | |
| 760 int nmethodZombie = 0; | |
| 761 int nmethodUnloaded = 0; | |
| 762 int nmethodJava = 0; | |
| 763 int nmethodNative = 0; | |
| 764 int maxCodeSize = 0; | |
| 765 ResourceMark rm; | |
| 766 | |
| 767 CodeBlob *cb; | |
| 768 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 769 total++; | |
| 770 if (cb->is_nmethod()) { | |
| 771 nmethod* nm = (nmethod*)cb; | |
| 772 | |
| 773 if (Verbose && nm->method() != NULL) { | |
| 774 ResourceMark rm; | |
| 775 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
| 776 tty->print("%s", method_name); | |
| 777 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
| 778 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
| 779 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
| 780 } | |
| 781 | |
| 782 nmethodCount++; | |
| 783 | |
| 784 if(nm->is_alive()) { nmethodAlive++; } | |
| 785 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
| 786 if(nm->is_zombie()) { nmethodZombie++; } | |
| 787 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
| 788 if(nm->is_native_method()) { nmethodNative++; } | |
| 789 | |
| 790 if(nm->method() != NULL && nm->is_java_method()) { | |
| 791 nmethodJava++; | |
| 792 if(nm->code_size() > maxCodeSize) { | |
| 793 maxCodeSize = nm->code_size(); | |
| 794 } | |
| 795 } | |
| 796 } else if (cb->is_runtime_stub()) { | |
| 797 runtimeStubCount++; | |
| 798 } else if (cb->is_deoptimization_stub()) { | |
| 799 deoptimizationStubCount++; | |
| 800 } else if (cb->is_uncommon_trap_stub()) { | |
| 801 uncommonTrapStubCount++; | |
| 802 } else if (cb->is_adapter_blob()) { | |
| 803 adapterCount++; | |
| 804 } else if (cb->is_buffer_blob()) { | |
| 805 bufferBlobCount++; | |
| 806 } | |
| 807 } | |
| 808 | |
| 809 int bucketSize = 512; | |
| 810 int bucketLimit = maxCodeSize / bucketSize + 1; | |
| 811 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit); | |
| 812 memset(buckets,0,sizeof(int) * bucketLimit); | |
| 813 | |
| 814 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 815 if (cb->is_nmethod()) { | |
| 816 nmethod* nm = (nmethod*)cb; | |
| 817 if(nm->is_java_method()) { | |
| 818 buckets[nm->code_size() / bucketSize]++; | |
| 819 } | |
| 820 } | |
| 821 } | |
| 822 tty->print_cr("Code Cache Entries (total of %d)",total); | |
| 823 tty->print_cr("-------------------------------------------------"); | |
| 824 tty->print_cr("nmethods: %d",nmethodCount); | |
| 825 tty->print_cr("\talive: %d",nmethodAlive); | |
| 826 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
| 827 tty->print_cr("\tzombie: %d",nmethodZombie); | |
| 828 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
| 829 tty->print_cr("\tjava: %d",nmethodJava); | |
| 830 tty->print_cr("\tnative: %d",nmethodNative); | |
| 831 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
| 832 tty->print_cr("adapters: %d",adapterCount); | |
| 833 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
| 834 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
| 835 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
| 836 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
| 837 tty->print_cr("-------------------------------------------------"); | |
| 838 | |
| 839 for(int i=0; i<bucketLimit; i++) { | |
| 840 if(buckets[i] != 0) { | |
| 841 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
| 842 tty->fill_to(40); | |
| 843 tty->print_cr("%d",buckets[i]); | |
| 844 } | |
| 845 } | |
| 846 | |
| 847 FREE_C_HEAP_ARRAY(int, buckets); | |
| 848 } | |
| 849 | |
| 850 void CodeCache::print() { | |
| 851 CodeBlob_sizes live; | |
| 852 CodeBlob_sizes dead; | |
| 853 | |
| 854 FOR_ALL_BLOBS(p) { | |
| 855 if (!p->is_alive()) { | |
| 856 dead.add(p); | |
| 857 } else { | |
| 858 live.add(p); | |
| 859 } | |
| 860 } | |
| 861 | |
| 862 tty->print_cr("CodeCache:"); | |
| 863 | |
| 864 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
| 865 dependentCheckTime.seconds() / dependentCheckCount); | |
| 866 | |
| 867 if (!live.is_empty()) { | |
| 868 live.print("live"); | |
| 869 } | |
| 870 if (!dead.is_empty()) { | |
| 871 dead.print("dead"); | |
| 872 } | |
| 873 | |
| 874 | |
| 875 if (Verbose) { | |
| 876 // print the oop_map usage | |
| 877 int code_size = 0; | |
| 878 int number_of_blobs = 0; | |
| 879 int number_of_oop_maps = 0; | |
| 880 int map_size = 0; | |
| 881 FOR_ALL_BLOBS(p) { | |
| 882 if (p->is_alive()) { | |
| 883 number_of_blobs++; | |
| 884 code_size += p->instructions_size(); | |
| 885 OopMapSet* set = p->oop_maps(); | |
| 886 if (set != NULL) { | |
| 887 number_of_oop_maps += set->size(); | |
| 888 map_size += set->heap_size(); | |
| 889 } | |
| 890 } | |
| 891 } | |
| 892 tty->print_cr("OopMaps"); | |
| 893 tty->print_cr(" #blobs = %d", number_of_blobs); | |
| 894 tty->print_cr(" code size = %d", code_size); | |
| 895 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
| 896 tty->print_cr(" map size = %d", map_size); | |
| 897 } | |
| 898 | |
| 899 } | |
| 900 | |
| 901 #endif // PRODUCT |