1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "code/codeBlob.hpp"
  27 #include "code/codeCache.hpp"
  28 #include "code/compiledIC.hpp"
  29 #include "code/dependencies.hpp"
  30 #include "code/icBuffer.hpp"
  31 #include "code/nmethod.hpp"
  32 #include "code/pcDesc.hpp"
  33 #include "compiler/compileBroker.hpp"
  34 #include "gc_implementation/shared/markSweep.hpp"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/gcLocker.hpp"
  37 #include "memory/iterator.hpp"
  38 #include "memory/resourceArea.hpp"
  39 #include "oops/method.hpp"
  40 #include "oops/objArrayOop.hpp"
  41 #include "oops/oop.inline.hpp"
  42 #include "runtime/handles.inline.hpp"
  43 #include "runtime/arguments.hpp"
  44 #include "runtime/icache.hpp"
  45 #include "runtime/java.hpp"
  46 #include "runtime/mutexLocker.hpp"
  47 #include "services/memoryService.hpp"
  48 #include "utilities/xmlstream.hpp"
  49 
  50 // Helper class for printing in CodeCache
  51 
  52 class CodeBlob_sizes {
  53  private:
  54   int count;
  55   int total_size;
  56   int header_size;
  57   int code_size;
  58   int stub_size;
  59   int relocation_size;
  60   int scopes_oop_size;
  61   int scopes_metadata_size;
  62   int scopes_data_size;
  63   int scopes_pcs_size;
  64 
  65  public:
  66   CodeBlob_sizes() {
  67     count            = 0;
  68     total_size       = 0;
  69     header_size      = 0;
  70     code_size        = 0;
  71     stub_size        = 0;
  72     relocation_size  = 0;
  73     scopes_oop_size  = 0;
  74     scopes_metadata_size  = 0;
  75     scopes_data_size = 0;
  76     scopes_pcs_size  = 0;
  77   }
  78 
  79   int total()                                    { return total_size; }
  80   bool is_empty()                                { return count == 0; }
  81 
  82   void print(const char* title) {
  83     tty->print_cr(" #%d %s = %dK (hdr %d%%,  loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",
  84                   count,
  85                   title,
  86                   total() / K,
  87                   header_size             * 100 / total_size,
  88                   relocation_size         * 100 / total_size,
  89                   code_size               * 100 / total_size,
  90                   stub_size               * 100 / total_size,
  91                   scopes_oop_size         * 100 / total_size,
  92                   scopes_metadata_size    * 100 / total_size,
  93                   scopes_data_size        * 100 / total_size,
  94                   scopes_pcs_size         * 100 / total_size);
  95   }
  96 
  97   void add(CodeBlob* cb) {
  98     count++;
  99     total_size       += cb->size();
 100     header_size      += cb->header_size();
 101     relocation_size  += cb->relocation_size();
 102     if (cb->is_nmethod()) {
 103       nmethod* nm = cb->as_nmethod_or_null();
 104       code_size        += nm->insts_size();
 105       stub_size        += nm->stub_size();
 106 
 107       scopes_oop_size  += nm->oops_size();
 108       scopes_metadata_size  += nm->metadata_size();
 109       scopes_data_size += nm->scopes_data_size();
 110       scopes_pcs_size  += nm->scopes_pcs_size();
 111     } else {
 112       code_size        += cb->code_size();
 113     }
 114   }
 115 };
 116 
 117 
 118 // CodeCache implementation
 119 
 120 CodeHeap * CodeCache::_heap = new CodeHeap();
 121 int CodeCache::_number_of_blobs = 0;
 122 int CodeCache::_number_of_adapters = 0;
 123 int CodeCache::_number_of_nmethods = 0;
 124 int CodeCache::_number_of_nmethods_with_dependencies = 0;
 125 bool CodeCache::_needs_cache_clean = false;
 126 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
 127 nmethod* CodeCache::_saved_nmethods = NULL;
 128 
 129 
 130 CodeBlob* CodeCache::first() {
 131   assert_locked_or_safepoint(CodeCache_lock);
 132   return (CodeBlob*)_heap->first();
 133 }
 134 
 135 
 136 CodeBlob* CodeCache::next(CodeBlob* cb) {
 137   assert_locked_or_safepoint(CodeCache_lock);
 138   return (CodeBlob*)_heap->next(cb);
 139 }
 140 
 141 
 142 CodeBlob* CodeCache::alive(CodeBlob *cb) {
 143   assert_locked_or_safepoint(CodeCache_lock);
 144   while (cb != NULL && !cb->is_alive()) cb = next(cb);
 145   return cb;
 146 }
 147 
 148 
 149 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
 150   assert_locked_or_safepoint(CodeCache_lock);
 151   while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
 152   return (nmethod*)cb;
 153 }
 154 
 155 nmethod* CodeCache::first_nmethod() {
 156   assert_locked_or_safepoint(CodeCache_lock);
 157   CodeBlob* cb = first();
 158   while (cb != NULL && !cb->is_nmethod()) {
 159     cb = next(cb);
 160   }
 161   return (nmethod*)cb;
 162 }
 163 
 164 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
 165   assert_locked_or_safepoint(CodeCache_lock);
 166   cb = next(cb);
 167   while (cb != NULL && !cb->is_nmethod()) {
 168     cb = next(cb);
 169   }
 170   return (nmethod*)cb;
 171 }
 172 
 173 static size_t maxCodeCacheUsed = 0;
 174 
 175 CodeBlob* CodeCache::allocate(int size, bool is_critical) {
 176   // Do not seize the CodeCache lock here--if the caller has not
 177   // already done so, we are going to lose bigtime, since the code
 178   // cache will contain a garbage CodeBlob until the caller can
 179   // run the constructor for the CodeBlob subclass he is busy
 180   // instantiating.
 181   guarantee(size >= 0, "allocation request must be reasonable");
 182   assert_locked_or_safepoint(CodeCache_lock);
 183   CodeBlob* cb = NULL;
 184   _number_of_blobs++;
 185   while (true) {
 186     cb = (CodeBlob*)_heap->allocate(size, is_critical);
 187     if (cb != NULL) break;
 188     if (!_heap->expand_by(CodeCacheExpansionSize)) {
 189       // Expansion failed
 190       return NULL;
 191     }
 192     if (PrintCodeCacheExtension) {
 193       ResourceMark rm;
 194       tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
 195                     (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
 196                     (address)_heap->high() - (address)_heap->low_boundary());
 197     }
 198   }
 199   maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
 200                           (address)_heap->low_boundary()) - unallocated_capacity());
 201   verify_if_often();
 202   print_trace("allocation", cb, size);
 203   return cb;
 204 }
 205 
 206 void CodeCache::free(CodeBlob* cb) {
 207   assert_locked_or_safepoint(CodeCache_lock);
 208   verify_if_often();
 209 
 210   print_trace("free", cb);
 211   if (cb->is_nmethod()) {
 212     _number_of_nmethods--;
 213     if (((nmethod *)cb)->has_dependencies()) {
 214       _number_of_nmethods_with_dependencies--;
 215     }
 216   }
 217   if (cb->is_adapter_blob()) {
 218     _number_of_adapters--;
 219   }
 220   _number_of_blobs--;
 221 
 222   _heap->deallocate(cb);
 223 
 224   verify_if_often();
 225   assert(_number_of_blobs >= 0, "sanity check");
 226 }
 227 
 228 
 229 void CodeCache::commit(CodeBlob* cb) {
 230   // this is called by nmethod::nmethod, which must already own CodeCache_lock
 231   assert_locked_or_safepoint(CodeCache_lock);
 232   if (cb->is_nmethod()) {
 233     _number_of_nmethods++;
 234     if (((nmethod *)cb)->has_dependencies()) {
 235       _number_of_nmethods_with_dependencies++;
 236     }
 237   }
 238   if (cb->is_adapter_blob()) {
 239     _number_of_adapters++;
 240   }
 241 
 242   // flush the hardware I-cache
 243   ICache::invalidate_range(cb->content_begin(), cb->content_size());
 244 }
 245 
 246 
 247 void CodeCache::flush() {
 248   assert_locked_or_safepoint(CodeCache_lock);
 249   Unimplemented();
 250 }
 251 
 252 
 253 // Iteration over CodeBlobs
 254 
 255 #define FOR_ALL_BLOBS(var)       for (CodeBlob *var =       first() ; var != NULL; var =       next(var) )
 256 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
 257 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
 258 
 259 
 260 bool CodeCache::contains(void *p) {
 261   // It should be ok to call contains without holding a lock
 262   return _heap->contains(p);
 263 }
 264 
 265 
 266 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
 267 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
 268 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
 269 CodeBlob* CodeCache::find_blob(void* start) {
 270   CodeBlob* result = find_blob_unsafe(start);
 271   if (result == NULL) return NULL;
 272   // We could potientially look up non_entrant methods
 273   guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
 274   return result;
 275 }
 276 
 277 nmethod* CodeCache::find_nmethod(void* start) {
 278   CodeBlob *cb = find_blob(start);
 279   assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
 280   return (nmethod*)cb;
 281 }
 282 
 283 
 284 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
 285   assert_locked_or_safepoint(CodeCache_lock);
 286   FOR_ALL_BLOBS(p) {
 287     f(p);
 288   }
 289 }
 290 
 291 
 292 void CodeCache::nmethods_do(void f(nmethod* nm)) {
 293   assert_locked_or_safepoint(CodeCache_lock);
 294   FOR_ALL_BLOBS(nm) {
 295     if (nm->is_nmethod()) f((nmethod*)nm);
 296   }
 297 }
 298 
 299 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
 300   assert_locked_or_safepoint(CodeCache_lock);
 301   FOR_ALL_ALIVE_NMETHODS(nm) {
 302     f(nm);
 303   }
 304 }
 305 
 306 int CodeCache::alignment_unit() {
 307   return (int)_heap->alignment_unit();
 308 }
 309 
 310 
 311 int CodeCache::alignment_offset() {
 312   return (int)_heap->alignment_offset();
 313 }
 314 
 315 
 316 // Mark nmethods for unloading if they contain otherwise unreachable
 317 // oops.
 318 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
 319   assert_locked_or_safepoint(CodeCache_lock);
 320   FOR_ALL_ALIVE_NMETHODS(nm) {
 321     nm->do_unloading(is_alive, unloading_occurred);
 322   }
 323 }
 324 
 325 void CodeCache::blobs_do(CodeBlobClosure* f) {
 326   assert_locked_or_safepoint(CodeCache_lock);
 327   FOR_ALL_ALIVE_BLOBS(cb) {
 328     f->do_code_blob(cb);
 329 
 330 #ifdef ASSERT
 331     if (cb->is_nmethod())
 332       ((nmethod*)cb)->verify_scavenge_root_oops();
 333 #endif //ASSERT
 334   }
 335 }
 336 
 337 // Walk the list of methods which might contain non-perm oops.
 338 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
 339   assert_locked_or_safepoint(CodeCache_lock);
 340   debug_only(mark_scavenge_root_nmethods());
 341 
 342   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 343     debug_only(cur->clear_scavenge_root_marked());
 344     assert(cur->scavenge_root_not_marked(), "");
 345     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 346 
 347     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
 348 #ifndef PRODUCT
 349     if (TraceScavenge) {
 350       cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
 351     }
 352 #endif //PRODUCT
 353     if (is_live) {
 354       // Perform cur->oops_do(f), maybe just once per nmethod.
 355       f->do_code_blob(cur);
 356     }
 357   }
 358 
 359   // Check for stray marks.
 360   debug_only(verify_perm_nmethods(NULL));
 361 }
 362 
 363 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
 364   assert_locked_or_safepoint(CodeCache_lock);
 365   nm->set_on_scavenge_root_list();
 366   nm->set_scavenge_root_link(_scavenge_root_nmethods);
 367   set_scavenge_root_nmethods(nm);
 368   print_trace("add_scavenge_root", nm);
 369 }
 370 
 371 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
 372   assert_locked_or_safepoint(CodeCache_lock);
 373   print_trace("drop_scavenge_root", nm);
 374   nmethod* last = NULL;
 375   nmethod* cur = scavenge_root_nmethods();
 376   while (cur != NULL) {
 377     nmethod* next = cur->scavenge_root_link();
 378     if (cur == nm) {
 379       if (last != NULL)
 380             last->set_scavenge_root_link(next);
 381       else  set_scavenge_root_nmethods(next);
 382       nm->set_scavenge_root_link(NULL);
 383       nm->clear_on_scavenge_root_list();
 384       return;
 385     }
 386     last = cur;
 387     cur = next;
 388   }
 389   assert(false, "should have been on list");
 390 }
 391 
 392 void CodeCache::prune_scavenge_root_nmethods() {
 393   assert_locked_or_safepoint(CodeCache_lock);
 394   debug_only(mark_scavenge_root_nmethods());
 395 
 396   nmethod* last = NULL;
 397   nmethod* cur = scavenge_root_nmethods();
 398   while (cur != NULL) {
 399     nmethod* next = cur->scavenge_root_link();
 400     debug_only(cur->clear_scavenge_root_marked());
 401     assert(cur->scavenge_root_not_marked(), "");
 402     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 403 
 404     if (!cur->is_zombie() && !cur->is_unloaded()
 405         && cur->detect_scavenge_root_oops()) {
 406       // Keep it.  Advance 'last' to prevent deletion.
 407       last = cur;
 408     } else {
 409       // Prune it from the list, so we don't have to look at it any more.
 410       print_trace("prune_scavenge_root", cur);
 411       cur->set_scavenge_root_link(NULL);
 412       cur->clear_on_scavenge_root_list();
 413       if (last != NULL)
 414             last->set_scavenge_root_link(next);
 415       else  set_scavenge_root_nmethods(next);
 416     }
 417     cur = next;
 418   }
 419 
 420   // Check for stray marks.
 421   debug_only(verify_perm_nmethods(NULL));
 422 }
 423 
 424 #ifndef PRODUCT
 425 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
 426   // While we are here, verify the integrity of the list.
 427   mark_scavenge_root_nmethods();
 428   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 429     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 430     cur->clear_scavenge_root_marked();
 431   }
 432   verify_perm_nmethods(f);
 433 }
 434 
 435 // Temporarily mark nmethods that are claimed to be on the non-perm list.
 436 void CodeCache::mark_scavenge_root_nmethods() {
 437   FOR_ALL_ALIVE_BLOBS(cb) {
 438     if (cb->is_nmethod()) {
 439       nmethod *nm = (nmethod*)cb;
 440       assert(nm->scavenge_root_not_marked(), "clean state");
 441       if (nm->on_scavenge_root_list())
 442         nm->set_scavenge_root_marked();
 443     }
 444   }
 445 }
 446 
 447 // If the closure is given, run it on the unlisted nmethods.
 448 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
 449 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
 450   FOR_ALL_ALIVE_BLOBS(cb) {
 451     bool call_f = (f_or_null != NULL);
 452     if (cb->is_nmethod()) {
 453       nmethod *nm = (nmethod*)cb;
 454       assert(nm->scavenge_root_not_marked(), "must be already processed");
 455       if (nm->on_scavenge_root_list())
 456         call_f = false;  // don't show this one to the client
 457       nm->verify_scavenge_root_oops();
 458     } else {
 459       call_f = false;   // not an nmethod
 460     }
 461     if (call_f)  f_or_null->do_code_blob(cb);
 462   }
 463 }
 464 #endif //PRODUCT
 465 
 466 /**
 467  * Remove and return nmethod from the saved code list in order to reanimate it.
 468  */
 469 nmethod* CodeCache::reanimate_saved_code(Method* m) {
 470   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 471   nmethod* saved = _saved_nmethods;
 472   nmethod* prev = NULL;
 473   while (saved != NULL) {
 474     if (saved->is_in_use() && saved->method() == m) {
 475       if (prev != NULL) {
 476         prev->set_saved_nmethod_link(saved->saved_nmethod_link());
 477       } else {
 478         _saved_nmethods = saved->saved_nmethod_link();
 479       }
 480       assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
 481       saved->set_speculatively_disconnected(false);
 482       saved->set_saved_nmethod_link(NULL);
 483       if (PrintMethodFlushing) {
 484         saved->print_on(tty, " ### nmethod is reconnected");
 485       }
 486       if (LogCompilation && (xtty != NULL)) {
 487         ttyLocker ttyl;
 488         xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
 489         xtty->method(m);
 490         xtty->stamp();
 491         xtty->end_elem();
 492       }
 493       return saved;
 494     }
 495     prev = saved;
 496     saved = saved->saved_nmethod_link();
 497   }
 498   return NULL;
 499 }
 500 
 501 /**
 502  * Remove nmethod from the saved code list in order to discard it permanently
 503  */
 504 void CodeCache::remove_saved_code(nmethod* nm) {
 505   // For conc swpr this will be called with CodeCache_lock taken by caller
 506   assert_locked_or_safepoint(CodeCache_lock);
 507   assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
 508   nmethod* saved = _saved_nmethods;
 509   nmethod* prev = NULL;
 510   while (saved != NULL) {
 511     if (saved == nm) {
 512       if (prev != NULL) {
 513         prev->set_saved_nmethod_link(saved->saved_nmethod_link());
 514       } else {
 515         _saved_nmethods = saved->saved_nmethod_link();
 516       }
 517       if (LogCompilation && (xtty != NULL)) {
 518         ttyLocker ttyl;
 519         xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
 520         xtty->stamp();
 521         xtty->end_elem();
 522       }
 523       return;
 524     }
 525     prev = saved;
 526     saved = saved->saved_nmethod_link();
 527   }
 528   ShouldNotReachHere();
 529 }
 530 
 531 void CodeCache::speculatively_disconnect(nmethod* nm) {
 532   assert_locked_or_safepoint(CodeCache_lock);
 533   assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
 534   nm->set_saved_nmethod_link(_saved_nmethods);
 535   _saved_nmethods = nm;
 536   if (PrintMethodFlushing) {
 537     nm->print_on(tty, " ### nmethod is speculatively disconnected");
 538   }
 539   if (LogCompilation && (xtty != NULL)) {
 540     ttyLocker ttyl;
 541     xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
 542     xtty->method(nm->method());
 543     xtty->stamp();
 544     xtty->end_elem();
 545   }
 546   nm->method()->clear_code();
 547   nm->set_speculatively_disconnected(true);
 548 }
 549 
 550 
 551 void CodeCache::gc_prologue() {
 552   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
 553 }
 554 
 555 
 556 void CodeCache::gc_epilogue() {
 557   assert_locked_or_safepoint(CodeCache_lock);
 558   FOR_ALL_ALIVE_BLOBS(cb) {
 559     if (cb->is_nmethod()) {
 560       nmethod *nm = (nmethod*)cb;
 561       assert(!nm->is_unloaded(), "Tautology");
 562       if (needs_cache_clean()) {
 563         nm->cleanup_inline_caches();
 564       }
 565       DEBUG_ONLY(nm->verify());
 566       nm->fix_oop_relocations();
 567     }
 568   }
 569   set_needs_cache_clean(false);
 570   prune_scavenge_root_nmethods();
 571   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
 572 
 573 #ifdef ASSERT
 574   // make sure that we aren't leaking icholders
 575   int count = 0;
 576   FOR_ALL_BLOBS(cb) {
 577     if (cb->is_nmethod()) {
 578       RelocIterator iter((nmethod*)cb);
 579       while(iter.next()) {
 580         if (iter.type() == relocInfo::virtual_call_type) {
 581           if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
 582             CompiledIC *ic = CompiledIC_at(iter.reloc());
 583             if (TraceCompiledIC) {
 584               tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder());
 585               ic->print();
 586             }
 587             assert(ic->cached_icholder() != NULL, "must be non-NULL");
 588             count++;
 589           }
 590         }
 591       }
 592     }
 593   }
 594 
 595   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
 596          CompiledICHolder::live_count(), "must agree");
 597 #endif
 598 }
 599 
 600 
 601 void CodeCache::verify_oops() {
 602   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 603   VerifyOopClosure voc;
 604   FOR_ALL_ALIVE_BLOBS(cb) {
 605     if (cb->is_nmethod()) {
 606       nmethod *nm = (nmethod*)cb;
 607       nm->oops_do(&voc);
 608       nm->verify_oop_relocations();
 609     }
 610   }
 611 }
 612 
 613 
 614 address CodeCache::first_address() {
 615   assert_locked_or_safepoint(CodeCache_lock);
 616   return (address)_heap->low_boundary();
 617 }
 618 
 619 
 620 address CodeCache::last_address() {
 621   assert_locked_or_safepoint(CodeCache_lock);
 622   return (address)_heap->high();
 623 }
 624 
 625 /**
 626  * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
 627  * is free, reverse_free_ratio() returns 4.
 628  */
 629 double CodeCache::reverse_free_ratio() {
 630   double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
 631   double max_capacity = (double)CodeCache::max_capacity();
 632   return max_capacity / unallocated_capacity;
 633 }
 634 
 635 void icache_init();
 636 
 637 void CodeCache::initialize() {
 638   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
 639 #ifdef COMPILER2
 640   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");
 641 #endif
 642   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");
 643   // This was originally just a check of the alignment, causing failure, instead, round
 644   // the code cache to the page size.  In particular, Solaris is moving to a larger
 645   // default page size.
 646   CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
 647   InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
 648   ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
 649   if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
 650     vm_exit_during_initialization("Could not reserve enough space for code cache");
 651   }
 652 
 653   MemoryService::add_code_heap_memory_pool(_heap);
 654 
 655   // Initialize ICache flush mechanism
 656   // This service is needed for os::register_code_area
 657   icache_init();
 658 
 659   // Give OS a chance to register generated code area.
 660   // This is used on Windows 64 bit platforms to register
 661   // Structured Exception Handlers for our generated code.
 662   os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
 663 }
 664 
 665 
 666 void codeCache_init() {
 667   CodeCache::initialize();
 668 }
 669 
 670 //------------------------------------------------------------------------------------------------
 671 
 672 int CodeCache::number_of_nmethods_with_dependencies() {
 673   return _number_of_nmethods_with_dependencies;
 674 }
 675 
 676 void CodeCache::clear_inline_caches() {
 677   assert_locked_or_safepoint(CodeCache_lock);
 678   FOR_ALL_ALIVE_NMETHODS(nm) {
 679     nm->clear_inline_caches();
 680   }
 681 }
 682 
 683 #ifndef PRODUCT
 684 // used to keep track of how much time is spent in mark_for_deoptimization
 685 static elapsedTimer dependentCheckTime;
 686 static int dependentCheckCount = 0;
 687 #endif // PRODUCT
 688 
 689 
 690 int CodeCache::mark_for_deoptimization(DepChange& changes) {
 691   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 692 
 693 #ifndef PRODUCT
 694   dependentCheckTime.start();
 695   dependentCheckCount++;
 696 #endif // PRODUCT
 697 
 698   int number_of_marked_CodeBlobs = 0;
 699 
 700   // search the hierarchy looking for nmethods which are affected by the loading of this class
 701 
 702   // then search the interfaces this class implements looking for nmethods
 703   // which might be dependent of the fact that an interface only had one
 704   // implementor.
 705 
 706   { No_Safepoint_Verifier nsv;
 707     for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
 708       Klass* d = str.klass();
 709       number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
 710     }
 711   }
 712 
 713   if (VerifyDependencies) {
 714     // Turn off dependency tracing while actually testing deps.
 715     NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
 716     FOR_ALL_ALIVE_NMETHODS(nm) {
 717       if (!nm->is_marked_for_deoptimization() &&
 718           nm->check_all_dependencies()) {
 719         ResourceMark rm;
 720         tty->print_cr("Should have been marked for deoptimization:");
 721         changes.print();
 722         nm->print();
 723         nm->print_dependencies();
 724       }
 725     }
 726   }
 727 
 728 #ifndef PRODUCT
 729   dependentCheckTime.stop();
 730 #endif // PRODUCT
 731 
 732   return number_of_marked_CodeBlobs;
 733 }
 734 
 735 
 736 #ifdef HOTSWAP
 737 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
 738   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 739   int number_of_marked_CodeBlobs = 0;
 740 
 741   // Deoptimize all methods of the evolving class itself
 742   Array<Method*>* old_methods = dependee->methods();
 743   for (int i = 0; i < old_methods->length(); i++) {
 744     ResourceMark rm;
 745     Method* old_method = old_methods->at(i);
 746     nmethod *nm = old_method->code();
 747     if (nm != NULL) {
 748       nm->mark_for_deoptimization();
 749       number_of_marked_CodeBlobs++;
 750     }
 751   }
 752 
 753   FOR_ALL_ALIVE_NMETHODS(nm) {
 754     if (nm->is_marked_for_deoptimization()) {
 755       // ...Already marked in the previous pass; don't count it again.
 756     } else if (nm->is_evol_dependent_on(dependee())) {
 757       ResourceMark rm;
 758       nm->mark_for_deoptimization();
 759       number_of_marked_CodeBlobs++;
 760     } else  {
 761       // flush caches in case they refer to a redefined Method*
 762       nm->clear_inline_caches();
 763     }
 764   }
 765 
 766   return number_of_marked_CodeBlobs;
 767 }
 768 #endif // HOTSWAP
 769 
 770 
 771 // Deoptimize all methods
 772 void CodeCache::mark_all_nmethods_for_deoptimization() {
 773   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 774   FOR_ALL_ALIVE_NMETHODS(nm) {
 775     nm->mark_for_deoptimization();
 776   }
 777 }
 778 
 779 
 780 int CodeCache::mark_for_deoptimization(Method* dependee) {
 781   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 782   int number_of_marked_CodeBlobs = 0;
 783 
 784   FOR_ALL_ALIVE_NMETHODS(nm) {
 785     if (nm->is_dependent_on_method(dependee)) {
 786       ResourceMark rm;
 787       nm->mark_for_deoptimization();
 788       number_of_marked_CodeBlobs++;
 789     }
 790   }
 791 
 792   return number_of_marked_CodeBlobs;
 793 }
 794 
 795 void CodeCache::make_marked_nmethods_zombies() {
 796   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 797   FOR_ALL_ALIVE_NMETHODS(nm) {
 798     if (nm->is_marked_for_deoptimization()) {
 799 
 800       // If the nmethod has already been made non-entrant and it can be converted
 801       // then zombie it now. Otherwise make it non-entrant and it will eventually
 802       // be zombied when it is no longer seen on the stack. Note that the nmethod
 803       // might be "entrant" and not on the stack and so could be zombied immediately
 804       // but we can't tell because we don't track it on stack until it becomes
 805       // non-entrant.
 806 
 807       if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
 808         nm->make_zombie();
 809       } else {
 810         nm->make_not_entrant();
 811       }
 812     }
 813   }
 814 }
 815 
 816 void CodeCache::make_marked_nmethods_not_entrant() {
 817   assert_locked_or_safepoint(CodeCache_lock);
 818   FOR_ALL_ALIVE_NMETHODS(nm) {
 819     if (nm->is_marked_for_deoptimization()) {
 820       nm->make_not_entrant();
 821     }
 822   }
 823 }
 824 
 825 void CodeCache::verify() {
 826   _heap->verify();
 827   FOR_ALL_ALIVE_BLOBS(p) {
 828     p->verify();
 829   }
 830 }
 831 
 832 //------------------------------------------------------------------------------------------------
 833 // Non-product version
 834 
 835 #ifndef PRODUCT
 836 
 837 void CodeCache::verify_if_often() {
 838   if (VerifyCodeCacheOften) {
 839     _heap->verify();
 840   }
 841 }
 842 
 843 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
 844   if (PrintCodeCache2) {  // Need to add a new flag
 845     ResourceMark rm;
 846     if (size == 0)  size = cb->size();
 847     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
 848   }
 849 }
 850 
 851 void CodeCache::print_internals() {
 852   int nmethodCount = 0;
 853   int runtimeStubCount = 0;
 854   int adapterCount = 0;
 855   int deoptimizationStubCount = 0;
 856   int uncommonTrapStubCount = 0;
 857   int bufferBlobCount = 0;
 858   int total = 0;
 859   int nmethodAlive = 0;
 860   int nmethodNotEntrant = 0;
 861   int nmethodZombie = 0;
 862   int nmethodUnloaded = 0;
 863   int nmethodJava = 0;
 864   int nmethodNative = 0;
 865   int maxCodeSize = 0;
 866   ResourceMark rm;
 867 
 868   CodeBlob *cb;
 869   for (cb = first(); cb != NULL; cb = next(cb)) {
 870     total++;
 871     if (cb->is_nmethod()) {
 872       nmethod* nm = (nmethod*)cb;
 873 
 874       if (Verbose && nm->method() != NULL) {
 875         ResourceMark rm;
 876         char *method_name = nm->method()->name_and_sig_as_C_string();
 877         tty->print("%s", method_name);
 878         if(nm->is_alive()) { tty->print_cr(" alive"); }
 879         if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
 880         if(nm->is_zombie()) { tty->print_cr(" zombie"); }
 881       }
 882 
 883       nmethodCount++;
 884 
 885       if(nm->is_alive()) { nmethodAlive++; }
 886       if(nm->is_not_entrant()) { nmethodNotEntrant++; }
 887       if(nm->is_zombie()) { nmethodZombie++; }
 888       if(nm->is_unloaded()) { nmethodUnloaded++; }
 889       if(nm->is_native_method()) { nmethodNative++; }
 890 
 891       if(nm->method() != NULL && nm->is_java_method()) {
 892         nmethodJava++;
 893         if (nm->insts_size() > maxCodeSize) {
 894           maxCodeSize = nm->insts_size();
 895         }
 896       }
 897     } else if (cb->is_runtime_stub()) {
 898       runtimeStubCount++;
 899     } else if (cb->is_deoptimization_stub()) {
 900       deoptimizationStubCount++;
 901     } else if (cb->is_uncommon_trap_stub()) {
 902       uncommonTrapStubCount++;
 903     } else if (cb->is_adapter_blob()) {
 904       adapterCount++;
 905     } else if (cb->is_buffer_blob()) {
 906       bufferBlobCount++;
 907     }
 908   }
 909 
 910   int bucketSize = 512;
 911   int bucketLimit = maxCodeSize / bucketSize + 1;
 912   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
 913   memset(buckets,0,sizeof(int) * bucketLimit);
 914 
 915   for (cb = first(); cb != NULL; cb = next(cb)) {
 916     if (cb->is_nmethod()) {
 917       nmethod* nm = (nmethod*)cb;
 918       if(nm->is_java_method()) {
 919         buckets[nm->insts_size() / bucketSize]++;
 920       }
 921     }
 922   }
 923   tty->print_cr("Code Cache Entries (total of %d)",total);
 924   tty->print_cr("-------------------------------------------------");
 925   tty->print_cr("nmethods: %d",nmethodCount);
 926   tty->print_cr("\talive: %d",nmethodAlive);
 927   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
 928   tty->print_cr("\tzombie: %d",nmethodZombie);
 929   tty->print_cr("\tunloaded: %d",nmethodUnloaded);
 930   tty->print_cr("\tjava: %d",nmethodJava);
 931   tty->print_cr("\tnative: %d",nmethodNative);
 932   tty->print_cr("runtime_stubs: %d",runtimeStubCount);
 933   tty->print_cr("adapters: %d",adapterCount);
 934   tty->print_cr("buffer blobs: %d",bufferBlobCount);
 935   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
 936   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
 937   tty->print_cr("\nnmethod size distribution (non-zombie java)");
 938   tty->print_cr("-------------------------------------------------");
 939 
 940   for(int i=0; i<bucketLimit; i++) {
 941     if(buckets[i] != 0) {
 942       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
 943       tty->fill_to(40);
 944       tty->print_cr("%d",buckets[i]);
 945     }
 946   }
 947 
 948   FREE_C_HEAP_ARRAY(int, buckets, mtCode);
 949 }
 950 
 951 #endif // !PRODUCT
 952 
 953 void CodeCache::print() {
 954   print_summary(tty);
 955 
 956 #ifndef PRODUCT
 957   if (!Verbose) return;
 958 
 959   CodeBlob_sizes live;
 960   CodeBlob_sizes dead;
 961 
 962   FOR_ALL_BLOBS(p) {
 963     if (!p->is_alive()) {
 964       dead.add(p);
 965     } else {
 966       live.add(p);
 967     }
 968   }
 969 
 970   tty->print_cr("CodeCache:");
 971 
 972   tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
 973                 dependentCheckTime.seconds() / dependentCheckCount);
 974 
 975   if (!live.is_empty()) {
 976     live.print("live");
 977   }
 978   if (!dead.is_empty()) {
 979     dead.print("dead");
 980   }
 981 
 982 
 983   if (WizardMode) {
 984      // print the oop_map usage
 985     int code_size = 0;
 986     int number_of_blobs = 0;
 987     int number_of_oop_maps = 0;
 988     int map_size = 0;
 989     FOR_ALL_BLOBS(p) {
 990       if (p->is_alive()) {
 991         number_of_blobs++;
 992         code_size += p->code_size();
 993         OopMapSet* set = p->oop_maps();
 994         if (set != NULL) {
 995           number_of_oop_maps += set->size();
 996           map_size           += set->heap_size();
 997         }
 998       }
 999     }
1000     tty->print_cr("OopMaps");
1001     tty->print_cr("  #blobs    = %d", number_of_blobs);
1002     tty->print_cr("  code size = %d", code_size);
1003     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);
1004     tty->print_cr("  map size  = %d", map_size);
1005   }
1006 
1007 #endif // !PRODUCT
1008 }
1009 
1010 void CodeCache::print_summary(outputStream* st, bool detailed) {
1011   size_t total = (_heap->high_boundary() - _heap->low_boundary());
1012   st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
1013                "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
1014                total/K, (total - unallocated_capacity())/K,
1015                maxCodeCacheUsed/K, unallocated_capacity()/K);
1016 
1017   if (detailed) {
1018     st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
1019                  _heap->low_boundary(),
1020                  _heap->high(),
1021                  _heap->high_boundary());
1022     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
1023                  " adapters=" UINT32_FORMAT,
1024                  nof_blobs(), nof_nmethods(), nof_adapters());
1025     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
1026                  "enabled" : Arguments::mode() == Arguments::_int ?
1027                  "disabled (interpreter mode)" :
1028                  "disabled (not enough contiguous free space left)");
1029   }
1030 }
1031 
1032 void CodeCache::log_state(outputStream* st) {
1033   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1034             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
1035             nof_blobs(), nof_nmethods(), nof_adapters(),
1036             unallocated_capacity());
1037 }
1038