Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.cpp @ 1644:2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn
| author | never |
|---|---|
| date | Thu, 08 Jul 2010 14:29:44 -0700 |
| parents | e9ff18c4ace7 |
| children | 3e8fbc61cee8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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; | |
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96 int CodeCache::_number_of_adapters = 0; |
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97 int CodeCache::_number_of_nmethods = 0; |
| 0 | 98 int CodeCache::_number_of_nmethods_with_dependencies = 0; |
| 99 bool CodeCache::_needs_cache_clean = false; | |
| 989 | 100 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
| 1202 | 101 nmethod* CodeCache::_saved_nmethods = NULL; |
| 0 | 102 |
| 103 | |
| 104 CodeBlob* CodeCache::first() { | |
| 105 assert_locked_or_safepoint(CodeCache_lock); | |
| 106 return (CodeBlob*)_heap->first(); | |
| 107 } | |
| 108 | |
| 109 | |
| 110 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
| 111 assert_locked_or_safepoint(CodeCache_lock); | |
| 112 return (CodeBlob*)_heap->next(cb); | |
| 113 } | |
| 114 | |
| 115 | |
| 116 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
| 117 assert_locked_or_safepoint(CodeCache_lock); | |
| 118 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
| 119 return cb; | |
| 120 } | |
| 121 | |
| 122 | |
| 123 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
| 124 assert_locked_or_safepoint(CodeCache_lock); | |
| 125 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
| 126 return (nmethod*)cb; | |
| 127 } | |
| 128 | |
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129 nmethod* CodeCache::first_nmethod() { |
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130 assert_locked_or_safepoint(CodeCache_lock); |
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131 CodeBlob* cb = first(); |
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132 while (cb != NULL && !cb->is_nmethod()) { |
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133 cb = next(cb); |
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134 } |
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135 return (nmethod*)cb; |
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136 } |
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137 |
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138 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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139 assert_locked_or_safepoint(CodeCache_lock); |
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140 cb = next(cb); |
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141 while (cb != NULL && !cb->is_nmethod()) { |
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142 cb = next(cb); |
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143 } |
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144 return (nmethod*)cb; |
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145 } |
| 0 | 146 |
| 147 CodeBlob* CodeCache::allocate(int size) { | |
| 148 // Do not seize the CodeCache lock here--if the caller has not | |
| 149 // already done so, we are going to lose bigtime, since the code | |
| 150 // cache will contain a garbage CodeBlob until the caller can | |
| 151 // run the constructor for the CodeBlob subclass he is busy | |
| 152 // instantiating. | |
| 153 guarantee(size >= 0, "allocation request must be reasonable"); | |
| 154 assert_locked_or_safepoint(CodeCache_lock); | |
| 155 CodeBlob* cb = NULL; | |
| 156 _number_of_blobs++; | |
| 157 while (true) { | |
| 158 cb = (CodeBlob*)_heap->allocate(size); | |
| 159 if (cb != NULL) break; | |
| 160 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
| 161 // Expansion failed | |
| 162 return NULL; | |
| 163 } | |
| 164 if (PrintCodeCacheExtension) { | |
| 165 ResourceMark rm; | |
| 166 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", | |
| 167 (intptr_t)_heap->begin(), (intptr_t)_heap->end(), | |
| 168 (address)_heap->end() - (address)_heap->begin()); | |
| 169 } | |
| 170 } | |
| 171 verify_if_often(); | |
| 989 | 172 print_trace("allocation", cb, size); |
| 0 | 173 return cb; |
| 174 } | |
| 175 | |
| 176 void CodeCache::free(CodeBlob* cb) { | |
| 177 assert_locked_or_safepoint(CodeCache_lock); | |
| 178 verify_if_often(); | |
| 179 | |
| 989 | 180 print_trace("free", cb); |
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181 if (cb->is_nmethod()) { |
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182 _number_of_nmethods--; |
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183 if (((nmethod *)cb)->has_dependencies()) { |
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184 _number_of_nmethods_with_dependencies--; |
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185 } |
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186 } |
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187 if (cb->is_adapter_blob()) { |
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188 _number_of_adapters--; |
| 0 | 189 } |
| 190 _number_of_blobs--; | |
| 191 | |
| 192 _heap->deallocate(cb); | |
| 193 | |
| 194 verify_if_often(); | |
| 195 assert(_number_of_blobs >= 0, "sanity check"); | |
| 196 } | |
| 197 | |
| 198 | |
| 199 void CodeCache::commit(CodeBlob* cb) { | |
| 200 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
| 201 assert_locked_or_safepoint(CodeCache_lock); | |
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202 if (cb->is_nmethod()) { |
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203 _number_of_nmethods++; |
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204 if (((nmethod *)cb)->has_dependencies()) { |
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205 _number_of_nmethods_with_dependencies++; |
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206 } |
| 0 | 207 } |
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208 if (cb->is_adapter_blob()) { |
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209 _number_of_adapters++; |
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210 } |
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211 |
| 0 | 212 // flush the hardware I-cache |
| 213 ICache::invalidate_range(cb->instructions_begin(), cb->instructions_size()); | |
| 214 } | |
| 215 | |
| 216 | |
| 217 void CodeCache::flush() { | |
| 218 assert_locked_or_safepoint(CodeCache_lock); | |
| 219 Unimplemented(); | |
| 220 } | |
| 221 | |
| 222 | |
| 223 // Iteration over CodeBlobs | |
| 224 | |
| 225 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
| 226 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
| 227 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
| 228 | |
| 229 | |
| 230 bool CodeCache::contains(void *p) { | |
| 231 // It should be ok to call contains without holding a lock | |
| 232 return _heap->contains(p); | |
| 233 } | |
| 234 | |
| 235 | |
| 236 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
| 237 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
| 238 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
| 239 CodeBlob* CodeCache::find_blob(void* start) { | |
| 240 CodeBlob* result = find_blob_unsafe(start); | |
| 241 if (result == NULL) return NULL; | |
| 242 // We could potientially look up non_entrant methods | |
| 243 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
| 244 return result; | |
| 245 } | |
| 246 | |
| 247 nmethod* CodeCache::find_nmethod(void* start) { | |
| 248 CodeBlob *cb = find_blob(start); | |
| 249 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
| 250 return (nmethod*)cb; | |
| 251 } | |
| 252 | |
| 253 | |
| 254 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
| 255 assert_locked_or_safepoint(CodeCache_lock); | |
| 256 FOR_ALL_BLOBS(p) { | |
| 257 f(p); | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 | |
| 262 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
| 263 assert_locked_or_safepoint(CodeCache_lock); | |
| 264 FOR_ALL_BLOBS(nm) { | |
| 265 if (nm->is_nmethod()) f((nmethod*)nm); | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 | |
| 270 int CodeCache::alignment_unit() { | |
| 271 return (int)_heap->alignment_unit(); | |
| 272 } | |
| 273 | |
| 274 | |
| 275 int CodeCache::alignment_offset() { | |
| 276 return (int)_heap->alignment_offset(); | |
| 277 } | |
| 278 | |
| 279 | |
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280 // Mark nmethods for unloading if they contain otherwise unreachable |
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281 // oops. |
| 0 | 282 void CodeCache::do_unloading(BoolObjectClosure* is_alive, |
| 283 OopClosure* keep_alive, | |
| 284 bool unloading_occurred) { | |
| 285 assert_locked_or_safepoint(CodeCache_lock); | |
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286 FOR_ALL_ALIVE_NMETHODS(nm) { |
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287 nm->do_unloading(is_alive, keep_alive, unloading_occurred); |
| 0 | 288 } |
| 289 } | |
| 290 | |
| 989 | 291 void CodeCache::blobs_do(CodeBlobClosure* f) { |
| 0 | 292 assert_locked_or_safepoint(CodeCache_lock); |
| 293 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 989 | 294 f->do_code_blob(cb); |
| 295 | |
| 296 #ifdef ASSERT | |
| 297 if (cb->is_nmethod()) | |
| 298 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
| 299 #endif //ASSERT | |
| 0 | 300 } |
| 301 } | |
| 302 | |
| 989 | 303 // Walk the list of methods which might contain non-perm oops. |
| 304 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
| 305 assert_locked_or_safepoint(CodeCache_lock); | |
| 306 debug_only(mark_scavenge_root_nmethods()); | |
| 307 | |
| 308 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 309 debug_only(cur->clear_scavenge_root_marked()); | |
| 310 assert(cur->scavenge_root_not_marked(), ""); | |
| 311 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 312 | |
| 313 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
| 314 #ifndef PRODUCT | |
| 315 if (TraceScavenge) { | |
| 316 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
| 317 } | |
| 318 #endif //PRODUCT | |
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319 if (is_live) { |
| 989 | 320 // Perform cur->oops_do(f), maybe just once per nmethod. |
| 321 f->do_code_blob(cur); | |
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322 cur->fix_oop_relocations(); |
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323 } |
| 989 | 324 } |
| 325 | |
| 326 // Check for stray marks. | |
| 327 debug_only(verify_perm_nmethods(NULL)); | |
| 328 } | |
| 329 | |
| 330 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
| 331 assert_locked_or_safepoint(CodeCache_lock); | |
| 332 nm->set_on_scavenge_root_list(); | |
| 333 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
| 334 set_scavenge_root_nmethods(nm); | |
| 335 print_trace("add_scavenge_root", nm); | |
| 336 } | |
| 337 | |
| 338 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
| 339 assert_locked_or_safepoint(CodeCache_lock); | |
| 340 print_trace("drop_scavenge_root", nm); | |
| 341 nmethod* last = NULL; | |
| 342 nmethod* cur = scavenge_root_nmethods(); | |
| 343 while (cur != NULL) { | |
| 344 nmethod* next = cur->scavenge_root_link(); | |
| 345 if (cur == nm) { | |
| 346 if (last != NULL) | |
| 347 last->set_scavenge_root_link(next); | |
| 348 else set_scavenge_root_nmethods(next); | |
| 349 nm->set_scavenge_root_link(NULL); | |
| 350 nm->clear_on_scavenge_root_list(); | |
| 351 return; | |
| 352 } | |
| 353 last = cur; | |
| 354 cur = next; | |
| 355 } | |
| 356 assert(false, "should have been on list"); | |
| 357 } | |
| 358 | |
| 359 void CodeCache::prune_scavenge_root_nmethods() { | |
| 360 assert_locked_or_safepoint(CodeCache_lock); | |
| 361 debug_only(mark_scavenge_root_nmethods()); | |
| 362 | |
| 363 nmethod* last = NULL; | |
| 364 nmethod* cur = scavenge_root_nmethods(); | |
| 365 while (cur != NULL) { | |
| 366 nmethod* next = cur->scavenge_root_link(); | |
| 367 debug_only(cur->clear_scavenge_root_marked()); | |
| 368 assert(cur->scavenge_root_not_marked(), ""); | |
| 369 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 370 | |
| 371 if (!cur->is_zombie() && !cur->is_unloaded() | |
| 372 && cur->detect_scavenge_root_oops()) { | |
| 373 // Keep it. Advance 'last' to prevent deletion. | |
| 374 last = cur; | |
| 375 } else { | |
| 376 // Prune it from the list, so we don't have to look at it any more. | |
| 377 print_trace("prune_scavenge_root", cur); | |
| 378 cur->set_scavenge_root_link(NULL); | |
| 379 cur->clear_on_scavenge_root_list(); | |
| 380 if (last != NULL) | |
| 381 last->set_scavenge_root_link(next); | |
| 382 else set_scavenge_root_nmethods(next); | |
| 383 } | |
| 384 cur = next; | |
| 385 } | |
| 386 | |
| 387 // Check for stray marks. | |
| 388 debug_only(verify_perm_nmethods(NULL)); | |
| 389 } | |
| 390 | |
| 391 #ifndef PRODUCT | |
| 392 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
| 393 // While we are here, verify the integrity of the list. | |
| 394 mark_scavenge_root_nmethods(); | |
| 395 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 396 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 397 cur->clear_scavenge_root_marked(); | |
| 398 } | |
| 399 verify_perm_nmethods(f); | |
| 400 } | |
| 401 | |
| 402 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
| 403 void CodeCache::mark_scavenge_root_nmethods() { | |
| 404 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 405 if (cb->is_nmethod()) { | |
| 406 nmethod *nm = (nmethod*)cb; | |
| 407 assert(nm->scavenge_root_not_marked(), "clean state"); | |
| 408 if (nm->on_scavenge_root_list()) | |
| 409 nm->set_scavenge_root_marked(); | |
| 410 } | |
| 411 } | |
| 412 } | |
| 413 | |
| 414 // If the closure is given, run it on the unlisted nmethods. | |
| 415 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
| 416 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
| 417 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 418 bool call_f = (f_or_null != NULL); | |
| 419 if (cb->is_nmethod()) { | |
| 420 nmethod *nm = (nmethod*)cb; | |
| 421 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
| 422 if (nm->on_scavenge_root_list()) | |
| 423 call_f = false; // don't show this one to the client | |
| 424 nm->verify_scavenge_root_oops(); | |
| 425 } else { | |
| 426 call_f = false; // not an nmethod | |
| 427 } | |
| 428 if (call_f) f_or_null->do_code_blob(cb); | |
| 429 } | |
| 430 } | |
| 431 #endif //PRODUCT | |
| 432 | |
| 1202 | 433 |
| 434 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) { | |
| 435 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 436 nmethod* saved = _saved_nmethods; | |
| 437 nmethod* prev = NULL; | |
| 438 while (saved != NULL) { | |
| 439 if (saved->is_in_use() && saved->method() == m) { | |
| 440 if (prev != NULL) { | |
| 441 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 442 } else { | |
| 443 _saved_nmethods = saved->saved_nmethod_link(); | |
| 444 } | |
| 445 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
| 446 saved->set_speculatively_disconnected(false); | |
| 447 saved->set_saved_nmethod_link(NULL); | |
| 448 if (PrintMethodFlushing) { | |
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449 saved->print_on(tty, " ### nmethod is reconnected\n"); |
| 1202 | 450 } |
| 451 if (LogCompilation && (xtty != NULL)) { | |
| 452 ttyLocker ttyl; | |
| 453 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
| 454 xtty->method(methodOop(m)); | |
| 455 xtty->stamp(); | |
| 456 xtty->end_elem(); | |
| 457 } | |
| 458 return saved; | |
| 459 } | |
| 460 prev = saved; | |
| 461 saved = saved->saved_nmethod_link(); | |
| 462 } | |
| 463 return NULL; | |
| 464 } | |
| 465 | |
| 466 void CodeCache::remove_saved_code(nmethod* nm) { | |
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467 // For conc swpr this will be called with CodeCache_lock taken by caller |
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468 assert_locked_or_safepoint(CodeCache_lock); |
| 1202 | 469 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
| 470 nmethod* saved = _saved_nmethods; | |
| 471 nmethod* prev = NULL; | |
| 472 while (saved != NULL) { | |
| 473 if (saved == nm) { | |
| 474 if (prev != NULL) { | |
| 475 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 476 } else { | |
| 477 _saved_nmethods = saved->saved_nmethod_link(); | |
| 478 } | |
| 479 if (LogCompilation && (xtty != NULL)) { | |
| 480 ttyLocker ttyl; | |
| 481 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
| 482 xtty->stamp(); | |
| 483 xtty->end_elem(); | |
| 484 } | |
| 485 return; | |
| 486 } | |
| 487 prev = saved; | |
| 488 saved = saved->saved_nmethod_link(); | |
| 489 } | |
| 490 ShouldNotReachHere(); | |
| 491 } | |
| 492 | |
| 493 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
| 494 assert_locked_or_safepoint(CodeCache_lock); | |
| 495 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
| 496 nm->set_saved_nmethod_link(_saved_nmethods); | |
| 497 _saved_nmethods = nm; | |
| 498 if (PrintMethodFlushing) { | |
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499 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
| 1202 | 500 } |
| 501 if (LogCompilation && (xtty != NULL)) { | |
| 502 ttyLocker ttyl; | |
| 503 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
| 504 xtty->method(methodOop(nm->method())); | |
| 505 xtty->stamp(); | |
| 506 xtty->end_elem(); | |
| 507 } | |
| 508 nm->method()->clear_code(); | |
| 509 nm->set_speculatively_disconnected(true); | |
| 510 } | |
| 511 | |
| 512 | |
| 0 | 513 void CodeCache::gc_prologue() { |
| 989 | 514 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
| 0 | 515 } |
| 516 | |
| 517 | |
| 518 void CodeCache::gc_epilogue() { | |
| 519 assert_locked_or_safepoint(CodeCache_lock); | |
| 520 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 521 if (cb->is_nmethod()) { | |
| 522 nmethod *nm = (nmethod*)cb; | |
| 523 assert(!nm->is_unloaded(), "Tautology"); | |
| 524 if (needs_cache_clean()) { | |
| 525 nm->cleanup_inline_caches(); | |
| 526 } | |
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527 DEBUG_ONLY(nm->verify()); |
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528 nm->fix_oop_relocations(); |
| 0 | 529 } |
| 530 } | |
| 531 set_needs_cache_clean(false); | |
| 989 | 532 prune_scavenge_root_nmethods(); |
| 533 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
| 0 | 534 } |
| 535 | |
| 536 | |
| 537 address CodeCache::first_address() { | |
| 538 assert_locked_or_safepoint(CodeCache_lock); | |
| 539 return (address)_heap->begin(); | |
| 540 } | |
| 541 | |
| 542 | |
| 543 address CodeCache::last_address() { | |
| 544 assert_locked_or_safepoint(CodeCache_lock); | |
| 545 return (address)_heap->end(); | |
| 546 } | |
| 547 | |
| 548 | |
| 549 void icache_init(); | |
| 550 | |
| 551 void CodeCache::initialize() { | |
| 552 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
| 553 #ifdef COMPILER2 | |
| 554 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
| 555 #endif | |
| 556 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
| 557 // This was originally just a check of the alignment, causing failure, instead, round | |
| 558 // the code cache to the page size. In particular, Solaris is moving to a larger | |
| 559 // default page size. | |
| 560 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
| 561 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
| 562 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
| 563 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
| 564 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
| 565 } | |
| 566 | |
| 567 MemoryService::add_code_heap_memory_pool(_heap); | |
| 568 | |
| 569 // Initialize ICache flush mechanism | |
| 570 // This service is needed for os::register_code_area | |
| 571 icache_init(); | |
| 572 | |
| 573 // Give OS a chance to register generated code area. | |
| 574 // This is used on Windows 64 bit platforms to register | |
| 575 // Structured Exception Handlers for our generated code. | |
| 576 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
| 577 } | |
| 578 | |
| 579 | |
| 580 void codeCache_init() { | |
| 581 CodeCache::initialize(); | |
| 582 } | |
| 583 | |
| 584 //------------------------------------------------------------------------------------------------ | |
| 585 | |
| 586 int CodeCache::number_of_nmethods_with_dependencies() { | |
| 587 return _number_of_nmethods_with_dependencies; | |
| 588 } | |
| 589 | |
| 590 void CodeCache::clear_inline_caches() { | |
| 591 assert_locked_or_safepoint(CodeCache_lock); | |
| 592 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 593 nm->clear_inline_caches(); | |
| 594 } | |
| 595 } | |
| 596 | |
| 597 #ifndef PRODUCT | |
| 598 // used to keep track of how much time is spent in mark_for_deoptimization | |
| 599 static elapsedTimer dependentCheckTime; | |
| 600 static int dependentCheckCount = 0; | |
| 601 #endif // PRODUCT | |
| 602 | |
| 603 | |
| 604 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
| 605 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 606 | |
| 607 #ifndef PRODUCT | |
| 608 dependentCheckTime.start(); | |
| 609 dependentCheckCount++; | |
| 610 #endif // PRODUCT | |
| 611 | |
| 612 int number_of_marked_CodeBlobs = 0; | |
| 613 | |
| 614 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
| 615 | |
| 616 // then search the interfaces this class implements looking for nmethods | |
| 617 // which might be dependent of the fact that an interface only had one | |
| 618 // implementor. | |
| 619 | |
| 620 { No_Safepoint_Verifier nsv; | |
| 621 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
| 622 klassOop d = str.klass(); | |
| 623 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes); | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 if (VerifyDependencies) { | |
| 628 // Turn off dependency tracing while actually testing deps. | |
| 629 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
| 630 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 631 if (!nm->is_marked_for_deoptimization() && | |
| 632 nm->check_all_dependencies()) { | |
| 633 ResourceMark rm; | |
| 634 tty->print_cr("Should have been marked for deoptimization:"); | |
| 635 changes.print(); | |
| 636 nm->print(); | |
| 637 nm->print_dependencies(); | |
| 638 } | |
| 639 } | |
| 640 } | |
| 641 | |
| 642 #ifndef PRODUCT | |
| 643 dependentCheckTime.stop(); | |
| 644 #endif // PRODUCT | |
| 645 | |
| 646 return number_of_marked_CodeBlobs; | |
| 647 } | |
| 648 | |
| 649 | |
| 650 #ifdef HOTSWAP | |
| 651 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
| 652 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 653 int number_of_marked_CodeBlobs = 0; | |
| 654 | |
| 655 // Deoptimize all methods of the evolving class itself | |
| 656 objArrayOop old_methods = dependee->methods(); | |
| 657 for (int i = 0; i < old_methods->length(); i++) { | |
| 658 ResourceMark rm; | |
| 659 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 660 nmethod *nm = old_method->code(); | |
| 661 if (nm != NULL) { | |
| 662 nm->mark_for_deoptimization(); | |
| 663 number_of_marked_CodeBlobs++; | |
| 664 } | |
| 665 } | |
| 666 | |
| 667 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 668 if (nm->is_marked_for_deoptimization()) { | |
| 669 // ...Already marked in the previous pass; don't count it again. | |
| 670 } else if (nm->is_evol_dependent_on(dependee())) { | |
| 671 ResourceMark rm; | |
| 672 nm->mark_for_deoptimization(); | |
| 673 number_of_marked_CodeBlobs++; | |
| 674 } else { | |
| 675 // flush caches in case they refer to a redefined methodOop | |
| 676 nm->clear_inline_caches(); | |
| 677 } | |
| 678 } | |
| 679 | |
| 680 return number_of_marked_CodeBlobs; | |
| 681 } | |
| 682 #endif // HOTSWAP | |
| 683 | |
| 684 | |
| 685 // Deoptimize all methods | |
| 686 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
| 687 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 688 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 689 nm->mark_for_deoptimization(); | |
| 690 } | |
| 691 } | |
| 692 | |
| 693 | |
| 694 int CodeCache::mark_for_deoptimization(methodOop dependee) { | |
| 695 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 696 int number_of_marked_CodeBlobs = 0; | |
| 697 | |
| 698 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 699 if (nm->is_dependent_on_method(dependee)) { | |
| 700 ResourceMark rm; | |
| 701 nm->mark_for_deoptimization(); | |
| 702 number_of_marked_CodeBlobs++; | |
| 703 } | |
| 704 } | |
| 705 | |
| 706 return number_of_marked_CodeBlobs; | |
| 707 } | |
| 708 | |
| 709 void CodeCache::make_marked_nmethods_zombies() { | |
| 710 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 711 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 712 if (nm->is_marked_for_deoptimization()) { | |
| 713 | |
| 714 // If the nmethod has already been made non-entrant and it can be converted | |
| 715 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
| 716 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
| 717 // might be "entrant" and not on the stack and so could be zombied immediately | |
| 718 // but we can't tell because we don't track it on stack until it becomes | |
| 719 // non-entrant. | |
| 720 | |
| 721 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
| 722 nm->make_zombie(); | |
| 723 } else { | |
| 724 nm->make_not_entrant(); | |
| 725 } | |
| 726 } | |
| 727 } | |
| 728 } | |
| 729 | |
| 730 void CodeCache::make_marked_nmethods_not_entrant() { | |
| 731 assert_locked_or_safepoint(CodeCache_lock); | |
| 732 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 733 if (nm->is_marked_for_deoptimization()) { | |
| 734 nm->make_not_entrant(); | |
| 735 } | |
| 736 } | |
| 737 } | |
| 738 | |
| 739 void CodeCache::verify() { | |
| 740 _heap->verify(); | |
| 741 FOR_ALL_ALIVE_BLOBS(p) { | |
| 742 p->verify(); | |
| 743 } | |
| 744 } | |
| 745 | |
| 746 //------------------------------------------------------------------------------------------------ | |
| 747 // Non-product version | |
| 748 | |
| 749 #ifndef PRODUCT | |
| 750 | |
| 751 void CodeCache::verify_if_often() { | |
| 752 if (VerifyCodeCacheOften) { | |
| 753 _heap->verify(); | |
| 754 } | |
| 755 } | |
| 756 | |
| 989 | 757 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
| 758 if (PrintCodeCache2) { // Need to add a new flag | |
| 759 ResourceMark rm; | |
| 760 if (size == 0) size = cb->size(); | |
| 761 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
| 762 } | |
| 763 } | |
| 764 | |
| 0 | 765 void CodeCache::print_internals() { |
| 766 int nmethodCount = 0; | |
| 767 int runtimeStubCount = 0; | |
| 768 int adapterCount = 0; | |
| 769 int deoptimizationStubCount = 0; | |
| 770 int uncommonTrapStubCount = 0; | |
| 771 int bufferBlobCount = 0; | |
| 772 int total = 0; | |
| 773 int nmethodAlive = 0; | |
| 774 int nmethodNotEntrant = 0; | |
| 775 int nmethodZombie = 0; | |
| 776 int nmethodUnloaded = 0; | |
| 777 int nmethodJava = 0; | |
| 778 int nmethodNative = 0; | |
| 779 int maxCodeSize = 0; | |
| 780 ResourceMark rm; | |
| 781 | |
| 782 CodeBlob *cb; | |
| 783 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 784 total++; | |
| 785 if (cb->is_nmethod()) { | |
| 786 nmethod* nm = (nmethod*)cb; | |
| 787 | |
| 788 if (Verbose && nm->method() != NULL) { | |
| 789 ResourceMark rm; | |
| 790 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
| 791 tty->print("%s", method_name); | |
| 792 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
| 793 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
| 794 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
| 795 } | |
| 796 | |
| 797 nmethodCount++; | |
| 798 | |
| 799 if(nm->is_alive()) { nmethodAlive++; } | |
| 800 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
| 801 if(nm->is_zombie()) { nmethodZombie++; } | |
| 802 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
| 803 if(nm->is_native_method()) { nmethodNative++; } | |
| 804 | |
| 805 if(nm->method() != NULL && nm->is_java_method()) { | |
| 806 nmethodJava++; | |
| 807 if(nm->code_size() > maxCodeSize) { | |
| 808 maxCodeSize = nm->code_size(); | |
| 809 } | |
| 810 } | |
| 811 } else if (cb->is_runtime_stub()) { | |
| 812 runtimeStubCount++; | |
| 813 } else if (cb->is_deoptimization_stub()) { | |
| 814 deoptimizationStubCount++; | |
| 815 } else if (cb->is_uncommon_trap_stub()) { | |
| 816 uncommonTrapStubCount++; | |
| 817 } else if (cb->is_adapter_blob()) { | |
| 818 adapterCount++; | |
| 819 } else if (cb->is_buffer_blob()) { | |
| 820 bufferBlobCount++; | |
| 821 } | |
| 822 } | |
| 823 | |
| 824 int bucketSize = 512; | |
| 825 int bucketLimit = maxCodeSize / bucketSize + 1; | |
| 826 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit); | |
| 827 memset(buckets,0,sizeof(int) * bucketLimit); | |
| 828 | |
| 829 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 830 if (cb->is_nmethod()) { | |
| 831 nmethod* nm = (nmethod*)cb; | |
| 832 if(nm->is_java_method()) { | |
| 833 buckets[nm->code_size() / bucketSize]++; | |
| 834 } | |
| 835 } | |
| 836 } | |
| 837 tty->print_cr("Code Cache Entries (total of %d)",total); | |
| 838 tty->print_cr("-------------------------------------------------"); | |
| 839 tty->print_cr("nmethods: %d",nmethodCount); | |
| 840 tty->print_cr("\talive: %d",nmethodAlive); | |
| 841 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
| 842 tty->print_cr("\tzombie: %d",nmethodZombie); | |
| 843 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
| 844 tty->print_cr("\tjava: %d",nmethodJava); | |
| 845 tty->print_cr("\tnative: %d",nmethodNative); | |
| 846 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
| 847 tty->print_cr("adapters: %d",adapterCount); | |
| 848 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
| 849 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
| 850 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
| 851 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
| 852 tty->print_cr("-------------------------------------------------"); | |
| 853 | |
| 854 for(int i=0; i<bucketLimit; i++) { | |
| 855 if(buckets[i] != 0) { | |
| 856 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
| 857 tty->fill_to(40); | |
| 858 tty->print_cr("%d",buckets[i]); | |
| 859 } | |
| 860 } | |
| 861 | |
| 862 FREE_C_HEAP_ARRAY(int, buckets); | |
| 863 } | |
| 864 | |
| 865 void CodeCache::print() { | |
| 866 CodeBlob_sizes live; | |
| 867 CodeBlob_sizes dead; | |
| 868 | |
| 869 FOR_ALL_BLOBS(p) { | |
| 870 if (!p->is_alive()) { | |
| 871 dead.add(p); | |
| 872 } else { | |
| 873 live.add(p); | |
| 874 } | |
| 875 } | |
| 876 | |
| 877 tty->print_cr("CodeCache:"); | |
| 878 | |
| 879 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
| 880 dependentCheckTime.seconds() / dependentCheckCount); | |
| 881 | |
| 882 if (!live.is_empty()) { | |
| 883 live.print("live"); | |
| 884 } | |
| 885 if (!dead.is_empty()) { | |
| 886 dead.print("dead"); | |
| 887 } | |
| 888 | |
| 889 | |
| 890 if (Verbose) { | |
| 891 // print the oop_map usage | |
| 892 int code_size = 0; | |
| 893 int number_of_blobs = 0; | |
| 894 int number_of_oop_maps = 0; | |
| 895 int map_size = 0; | |
| 896 FOR_ALL_BLOBS(p) { | |
| 897 if (p->is_alive()) { | |
| 898 number_of_blobs++; | |
| 899 code_size += p->instructions_size(); | |
| 900 OopMapSet* set = p->oop_maps(); | |
| 901 if (set != NULL) { | |
| 902 number_of_oop_maps += set->size(); | |
| 903 map_size += set->heap_size(); | |
| 904 } | |
| 905 } | |
| 906 } | |
| 907 tty->print_cr("OopMaps"); | |
| 908 tty->print_cr(" #blobs = %d", number_of_blobs); | |
| 909 tty->print_cr(" code size = %d", code_size); | |
| 910 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
| 911 tty->print_cr(" map size = %d", map_size); | |
| 912 } | |
| 913 | |
| 914 } | |
| 915 | |
| 916 #endif // PRODUCT |