1 /*
   2  * Copyright (c) 1997, 2014, 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 "runtime/compilationPolicy.hpp"
  48 #include "services/memoryService.hpp"
  49 #include "trace/tracing.hpp"
  50 #include "utilities/xmlstream.hpp"
  51 #ifdef COMPILER1
  52 #include "c1/c1_Compilation.hpp"
  53 #include "c1/c1_Compiler.hpp"
  54 #endif
  55 #ifdef COMPILER2
  56 #include "opto/c2compiler.hpp"
  57 #include "opto/compile.hpp"
  58 #include "opto/node.hpp"
  59 #endif
  60 
  61 // Helper class for printing in CodeCache
  62 class CodeBlob_sizes {
  63  private:
  64   int count;
  65   int total_size;
  66   int header_size;
  67   int code_size;
  68   int stub_size;
  69   int relocation_size;
  70   int scopes_oop_size;
  71   int scopes_metadata_size;
  72   int scopes_data_size;
  73   int scopes_pcs_size;
  74 
  75  public:
  76   CodeBlob_sizes() {
  77     count            = 0;
  78     total_size       = 0;
  79     header_size      = 0;
  80     code_size        = 0;
  81     stub_size        = 0;
  82     relocation_size  = 0;
  83     scopes_oop_size  = 0;
  84     scopes_metadata_size  = 0;
  85     scopes_data_size = 0;
  86     scopes_pcs_size  = 0;
  87   }
  88 
  89   int total()                                    { return total_size; }
  90   bool is_empty()                                { return count == 0; }
  91 
  92   void print(const char* title) {
  93     tty->print_cr(" #%d %s = %dK (hdr %d%%,  loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])",
  94                   count,
  95                   title,
  96                   (int)(total() / K),
  97                   header_size             * 100 / total_size,
  98                   relocation_size         * 100 / total_size,
  99                   code_size               * 100 / total_size,
 100                   stub_size               * 100 / total_size,
 101                   scopes_oop_size         * 100 / total_size,
 102                   scopes_metadata_size    * 100 / total_size,
 103                   scopes_data_size        * 100 / total_size,
 104                   scopes_pcs_size         * 100 / total_size);
 105   }
 106 
 107   void add(CodeBlob* cb) {
 108     count++;
 109     total_size       += cb->size();
 110     header_size      += cb->header_size();
 111     relocation_size  += cb->relocation_size();
 112     if (cb->is_nmethod()) {
 113       nmethod* nm = cb->as_nmethod_or_null();
 114       code_size        += nm->insts_size();
 115       stub_size        += nm->stub_size();
 116 
 117       scopes_oop_size  += nm->oops_size();
 118       scopes_metadata_size  += nm->metadata_size();
 119       scopes_data_size += nm->scopes_data_size();
 120       scopes_pcs_size  += nm->scopes_pcs_size();
 121     } else {
 122       code_size        += cb->code_size();
 123     }
 124   }
 125 };
 126 
 127 // Iterate over all CodeHeaps
 128 #define FOR_ALL_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _heaps->begin(); heap != _heaps->end(); ++heap)
 129 // Iterate over all CodeBlobs (cb) on the given CodeHeap
 130 #define FOR_ALL_BLOBS(cb, heap) for (CodeBlob* cb = first_blob(heap); cb != NULL; cb = next_blob(heap, cb))
 131 
 132 address CodeCache::_low_bound = 0;
 133 address CodeCache::_high_bound = 0;
 134 int CodeCache::_number_of_blobs = 0;
 135 int CodeCache::_number_of_adapters = 0;
 136 int CodeCache::_number_of_nmethods = 0;
 137 int CodeCache::_number_of_nmethods_with_dependencies = 0;
 138 bool CodeCache::_needs_cache_clean = false;
 139 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
 140 int CodeCache::_codemem_full_count = 0;
 141 
 142 // Initialize array of CodeHeaps
 143 GrowableArray<CodeHeap*>* CodeCache::_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);
 144 
 145 void CodeCache::initialize_heaps() {
 146   // Determine size of compiler buffers
 147   size_t code_buffers_size = 0;
 148 #ifdef COMPILER1
 149   // C1 temporary code buffers (see Compiler::init_buffer_blob())
 150   const int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 151   code_buffers_size += c1_count * Compiler::code_buffer_size();
 152 #endif
 153 #ifdef COMPILER2
 154   // C2 scratch buffers (see Compile::init_scratch_buffer_blob())
 155   const int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 156   // Initial size of constant table (this may be increased if a compiled method needs more space)
 157   code_buffers_size += c2_count * C2Compiler::initial_code_buffer_size();
 158 #endif
 159 
 160   // Calculate default CodeHeap sizes if not set by user
 161   if (!FLAG_IS_CMDLINE(NonNMethodCodeHeapSize) && !FLAG_IS_CMDLINE(ProfiledCodeHeapSize)
 162       && !FLAG_IS_CMDLINE(NonProfiledCodeHeapSize)) {
 163     // Increase default NonNMethodCodeHeapSize to account for compiler buffers
 164     FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, NonNMethodCodeHeapSize + code_buffers_size);
 165 
 166     // Check if we have enough space for the non-nmethod code heap
 167     if (ReservedCodeCacheSize > NonNMethodCodeHeapSize) {
 168       // Use the default value for NonNMethodCodeHeapSize and one half of the
 169       // remaining size for non-profiled methods and one half for profiled methods
 170       size_t remaining_size = ReservedCodeCacheSize - NonNMethodCodeHeapSize;
 171       size_t profiled_size = remaining_size / 2;
 172       size_t non_profiled_size = remaining_size - profiled_size;
 173       FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, profiled_size);
 174       FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, non_profiled_size);
 175     } else {
 176       // Use all space for the non-nmethod heap and set other heaps to minimal size
 177       FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, ReservedCodeCacheSize - os::vm_page_size() * 2);
 178       FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, os::vm_page_size());
 179       FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, os::vm_page_size());
 180     }
 181   }
 182 
 183   // We do not need the profiled CodeHeap, use all space for the non-profiled CodeHeap
 184   if(!heap_available(CodeBlobType::MethodProfiled)) {
 185     FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize + ProfiledCodeHeapSize);
 186     FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, 0);
 187   }
 188   // We do not need the non-profiled CodeHeap, use all space for the non-nmethod CodeHeap
 189   if(!heap_available(CodeBlobType::MethodNonProfiled)) {
 190     FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, NonNMethodCodeHeapSize + NonProfiledCodeHeapSize);
 191     FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, 0);
 192   }
 193 
 194   // Make sure we have enough space for VM internal code
 195   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
 196   if (NonNMethodCodeHeapSize < (min_code_cache_size + code_buffers_size)) {
 197     vm_exit_during_initialization("Not enough space in non-nmethod code heap to run VM.");
 198   }
 199   guarantee(NonProfiledCodeHeapSize + ProfiledCodeHeapSize + NonNMethodCodeHeapSize <= ReservedCodeCacheSize, "Size check");
 200 
 201   // Align reserved sizes of CodeHeaps
 202   size_t non_method_size    = ReservedCodeSpace::allocation_align_size_up(NonNMethodCodeHeapSize);
 203   size_t profiled_size      = ReservedCodeSpace::allocation_align_size_up(ProfiledCodeHeapSize);
 204   size_t non_profiled_size  = ReservedCodeSpace::allocation_align_size_up(NonProfiledCodeHeapSize);
 205 
 206   // Compute initial sizes of CodeHeaps
 207   size_t init_non_method_size   = MIN2(InitialCodeCacheSize, non_method_size);
 208   size_t init_profiled_size     = MIN2(InitialCodeCacheSize, profiled_size);
 209   size_t init_non_profiled_size = MIN2(InitialCodeCacheSize, non_profiled_size);
 210 
 211   // Reserve one continuous chunk of memory for CodeHeaps and split it into
 212   // parts for the individual heaps. The memory layout looks like this:
 213   // ---------- high -----------
 214   //    Non-profiled nmethods
 215   //      Profiled nmethods
 216   //         Non-nmethods
 217   // ---------- low ------------
 218   ReservedCodeSpace rs = reserve_heap_memory(non_profiled_size + profiled_size + non_method_size);
 219   ReservedSpace non_method_space    = rs.first_part(non_method_size);
 220   ReservedSpace rest                = rs.last_part(non_method_size);
 221   ReservedSpace profiled_space      = rest.first_part(profiled_size);
 222   ReservedSpace non_profiled_space  = rest.last_part(profiled_size);
 223 
 224   // Non-nmethods (stubs, adapters, ...)
 225   add_heap(non_method_space, "CodeHeap 'non-nmethods'", init_non_method_size, CodeBlobType::NonNMethod);
 226   // Tier 2 and tier 3 (profiled) methods
 227   add_heap(profiled_space, "CodeHeap 'profiled nmethods'", init_profiled_size, CodeBlobType::MethodProfiled);
 228   // Tier 1 and tier 4 (non-profiled) methods and native methods
 229   add_heap(non_profiled_space, "CodeHeap 'non-profiled nmethods'", init_non_profiled_size, CodeBlobType::MethodNonProfiled);
 230 }
 231 
 232 ReservedCodeSpace CodeCache::reserve_heap_memory(size_t size) {
 233   // Determine alignment
 234   const size_t page_size = os::can_execute_large_page_memory() ?
 235           MIN2(os::page_size_for_region(InitialCodeCacheSize, 8),
 236                os::page_size_for_region(size, 8)) :
 237           os::vm_page_size();
 238   const size_t granularity = os::vm_allocation_granularity();
 239   const size_t r_align = MAX2(page_size, granularity);
 240   const size_t r_size = align_size_up(size, r_align);
 241   const size_t rs_align = page_size == (size_t) os::vm_page_size() ? 0 :
 242     MAX2(page_size, granularity);
 243 
 244   ReservedCodeSpace rs(r_size, rs_align, rs_align > 0);
 245 
 246   // Initialize bounds
 247   _low_bound = (address)rs.base();
 248   _high_bound = _low_bound + rs.size();
 249 
 250   return rs;
 251 }
 252 
 253 bool CodeCache::heap_available(int code_blob_type) {
 254   if (!SegmentedCodeCache) {
 255     // No segmentation: use a single code heap
 256     return (code_blob_type == CodeBlobType::All);
 257   } else if (Arguments::mode() == Arguments::_int) {
 258     // Interpreter only: we don't need any method code heaps
 259     return (code_blob_type == CodeBlobType::NonNMethod);
 260   } else if (TieredCompilation && (TieredStopAtLevel > CompLevel_simple)) {
 261     // Tiered compilation: use all code heaps
 262     return (code_blob_type < CodeBlobType::All);
 263   } else {
 264     // No TieredCompilation: we only need the non-nmethod and non-profiled code heap
 265     return (code_blob_type == CodeBlobType::NonNMethod) ||
 266            (code_blob_type == CodeBlobType::MethodNonProfiled);
 267   }
 268 }
 269 
 270 void CodeCache::add_heap(ReservedSpace rs, const char* name, size_t size_initial, int code_blob_type) {
 271   // Check if heap is needed
 272   if (!heap_available(code_blob_type)) {
 273     return;
 274   }
 275 
 276   // Create CodeHeap
 277   CodeHeap* heap = new CodeHeap(name, code_blob_type);
 278   _heaps->append(heap);
 279 
 280   // Reserve Space
 281   size_initial = round_to(size_initial, os::vm_page_size());
 282 
 283   if (!heap->reserve(rs, size_initial, CodeCacheSegmentSize)) {
 284     vm_exit_during_initialization("Could not reserve enough space for code cache");
 285   }
 286 
 287   // Register the CodeHeap
 288   MemoryService::add_code_heap_memory_pool(heap, name);
 289 }
 290 
 291 CodeHeap* CodeCache::get_code_heap(CodeBlob* cb) {
 292   assert(cb != NULL, "CodeBlob is null");
 293   FOR_ALL_HEAPS(heap) {
 294     if ((*heap)->contains(cb)) {
 295       return *heap;
 296     }
 297   }
 298   ShouldNotReachHere();
 299   return NULL;
 300 }
 301 
 302 CodeHeap* CodeCache::get_code_heap(int code_blob_type) {
 303   FOR_ALL_HEAPS(heap) {
 304     if ((*heap)->accepts(code_blob_type)) {
 305       return *heap;
 306     }
 307   }
 308   return NULL;
 309 }
 310 
 311 CodeBlob* CodeCache::first_blob(CodeHeap* heap) {
 312   assert_locked_or_safepoint(CodeCache_lock);
 313   assert(heap != NULL, "heap is null");
 314   return (CodeBlob*)heap->first();
 315 }
 316 
 317 CodeBlob* CodeCache::first_blob(int code_blob_type) {
 318   if (heap_available(code_blob_type)) {
 319     return first_blob(get_code_heap(code_blob_type));
 320   } else {
 321     return NULL;
 322   }
 323 }
 324 
 325 CodeBlob* CodeCache::next_blob(CodeHeap* heap, CodeBlob* cb) {
 326   assert_locked_or_safepoint(CodeCache_lock);
 327   assert(heap != NULL, "heap is null");
 328   return (CodeBlob*)heap->next(cb);
 329 }
 330 
 331 CodeBlob* CodeCache::next_blob(CodeBlob* cb) {
 332   return next_blob(get_code_heap(cb), cb);
 333 }
 334 
 335 CodeBlob* CodeCache::allocate(int size, int code_blob_type, bool is_critical) {
 336   // Do not seize the CodeCache lock here--if the caller has not
 337   // already done so, we are going to lose bigtime, since the code
 338   // cache will contain a garbage CodeBlob until the caller can
 339   // run the constructor for the CodeBlob subclass he is busy
 340   // instantiating.
 341   assert_locked_or_safepoint(CodeCache_lock);
 342   assert(size > 0, "allocation request must be reasonable");
 343   if (size <= 0) {
 344     return NULL;
 345   }
 346   CodeBlob* cb = NULL;
 347 
 348   // Get CodeHeap for the given CodeBlobType
 349   CodeHeap* heap = get_code_heap(code_blob_type);
 350   assert(heap != NULL, "heap is null");
 351 
 352   while (true) {
 353     cb = (CodeBlob*)heap->allocate(size, is_critical);
 354     if (cb != NULL) break;
 355     if (!heap->expand_by(CodeCacheExpansionSize)) {
 356       // Expansion failed
 357       if (SegmentedCodeCache && (code_blob_type == CodeBlobType::NonNMethod)) {
 358         // Fallback solution: Store non-nmethod code in the non-profiled code heap
 359         return allocate(size, CodeBlobType::MethodNonProfiled, is_critical);
 360       }
 361       return NULL;
 362     }
 363     if (PrintCodeCacheExtension) {
 364       ResourceMark rm;
 365       if (SegmentedCodeCache) {
 366         tty->print("%s", heap->name());
 367       } else {
 368         tty->print("CodeCache");
 369       }
 370       tty->print_cr(" extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",
 371                     (intptr_t)heap->low_boundary(), (intptr_t)heap->high(),
 372                     (address)heap->high() - (address)heap->low_boundary());
 373     }
 374   }
 375   print_trace("allocation", cb, size);
 376   _number_of_blobs++;
 377   return cb;
 378 }
 379 
 380 void CodeCache::free(CodeBlob* cb) {
 381   assert_locked_or_safepoint(CodeCache_lock);
 382 
 383   print_trace("free", cb);
 384   if (cb->is_nmethod()) {
 385     _number_of_nmethods--;
 386     if (((nmethod *)cb)->has_dependencies()) {
 387       _number_of_nmethods_with_dependencies--;
 388     }
 389   }
 390   if (cb->is_adapter_blob()) {
 391     _number_of_adapters--;
 392   }
 393   _number_of_blobs--;
 394 
 395   // Get heap for given CodeBlob and deallocate
 396   get_code_heap(cb)->deallocate(cb);
 397 
 398   assert(_number_of_blobs >= 0, "sanity check");
 399 }
 400 
 401 void CodeCache::commit(CodeBlob* cb) {
 402   // this is called by nmethod::nmethod, which must already own CodeCache_lock
 403   assert_locked_or_safepoint(CodeCache_lock);
 404   if (cb->is_nmethod()) {
 405     _number_of_nmethods++;
 406     if (((nmethod *)cb)->has_dependencies()) {
 407       _number_of_nmethods_with_dependencies++;
 408     }
 409   }
 410   if (cb->is_adapter_blob()) {
 411     _number_of_adapters++;
 412   }
 413 
 414   // flush the hardware I-cache
 415   ICache::invalidate_range(cb->content_begin(), cb->content_size());
 416 }
 417 
 418 bool CodeCache::contains(void *p) {
 419   // It should be ok to call contains without holding a lock
 420   FOR_ALL_HEAPS(heap) {
 421     if ((*heap)->contains(p)) {
 422       return true;
 423     }
 424   }
 425   return false;
 426 }
 427 
 428 // This method is safe to call without holding the CodeCache_lock, as long as a dead CodeBlob is not
 429 // looked up (i.e., one that has been marked for deletion). It only depends on the _segmap to contain
 430 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
 431 CodeBlob* CodeCache::find_blob(void* start) {
 432   CodeBlob* result = find_blob_unsafe(start);
 433   // We could potentially look up non_entrant methods
 434   guarantee(result == NULL || !result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
 435   return result;
 436 }
 437 
 438 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
 439 // what you are doing)
 440 CodeBlob* CodeCache::find_blob_unsafe(void* start) {
 441   // NMT can walk the stack before code cache is created
 442   if (_heaps == NULL || _heaps->is_empty()) return NULL;
 443 
 444   FOR_ALL_HEAPS(heap) {
 445     CodeBlob* result = (CodeBlob*) (*heap)->find_start(start);
 446     if (result != NULL && result->blob_contains((address)start)) {
 447       return result;
 448     }
 449   }
 450   return NULL;
 451 }
 452 
 453 nmethod* CodeCache::find_nmethod(void* start) {
 454   CodeBlob* cb = find_blob(start);
 455   assert(cb->is_nmethod(), "did not find an nmethod");
 456   return (nmethod*)cb;
 457 }
 458 
 459 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
 460   assert_locked_or_safepoint(CodeCache_lock);
 461   FOR_ALL_HEAPS(heap) {
 462     FOR_ALL_BLOBS(cb, *heap) {
 463       f(cb);
 464     }
 465   }
 466 }
 467 
 468 void CodeCache::nmethods_do(void f(nmethod* nm)) {
 469   assert_locked_or_safepoint(CodeCache_lock);
 470   NMethodIterator iter;
 471   while(iter.next()) {
 472     f(iter.method());
 473   }
 474 }
 475 
 476 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
 477   assert_locked_or_safepoint(CodeCache_lock);
 478   NMethodIterator iter;
 479   while(iter.next_alive()) {
 480     f(iter.method());
 481   }
 482 }
 483 
 484 int CodeCache::alignment_unit() {
 485   return (int)_heaps->first()->alignment_unit();
 486 }
 487 
 488 int CodeCache::alignment_offset() {
 489   return (int)_heaps->first()->alignment_offset();
 490 }
 491 
 492 // Mark nmethods for unloading if they contain otherwise unreachable oops.
 493 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
 494   assert_locked_or_safepoint(CodeCache_lock);
 495   NMethodIterator iter;
 496   while(iter.next_alive()) {
 497     iter.method()->do_unloading(is_alive, unloading_occurred);
 498   }
 499 }
 500 
 501 void CodeCache::blobs_do(CodeBlobClosure* f) {
 502   assert_locked_or_safepoint(CodeCache_lock);
 503   FOR_ALL_HEAPS(heap) {
 504     FOR_ALL_BLOBS(cb, *heap) {
 505       if (cb->is_alive()) {
 506         f->do_code_blob(cb);
 507 
 508 #ifdef ASSERT
 509         if (cb->is_nmethod())
 510         ((nmethod*)cb)->verify_scavenge_root_oops();
 511 #endif //ASSERT
 512       }
 513     }
 514   }
 515 }
 516 
 517 // Walk the list of methods which might contain non-perm oops.
 518 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
 519   assert_locked_or_safepoint(CodeCache_lock);
 520 
 521   if (UseG1GC) {
 522     return;
 523   }
 524 
 525   debug_only(mark_scavenge_root_nmethods());
 526 
 527   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 528     debug_only(cur->clear_scavenge_root_marked());
 529     assert(cur->scavenge_root_not_marked(), "");
 530     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 531 
 532     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
 533 #ifndef PRODUCT
 534     if (TraceScavenge) {
 535       cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
 536     }
 537 #endif //PRODUCT
 538     if (is_live) {
 539       // Perform cur->oops_do(f), maybe just once per nmethod.
 540       f->do_code_blob(cur);
 541     }
 542   }
 543 
 544   // Check for stray marks.
 545   debug_only(verify_perm_nmethods(NULL));
 546 }
 547 
 548 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
 549   assert_locked_or_safepoint(CodeCache_lock);
 550 
 551   if (UseG1GC) {
 552     return;
 553   }
 554 
 555   nm->set_on_scavenge_root_list();
 556   nm->set_scavenge_root_link(_scavenge_root_nmethods);
 557   set_scavenge_root_nmethods(nm);
 558   print_trace("add_scavenge_root", nm);
 559 }
 560 
 561 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
 562   assert_locked_or_safepoint(CodeCache_lock);
 563 
 564   if (UseG1GC) {
 565     return;
 566   }
 567 
 568   print_trace("drop_scavenge_root", nm);
 569   nmethod* last = NULL;
 570   nmethod* cur = scavenge_root_nmethods();
 571   while (cur != NULL) {
 572     nmethod* next = cur->scavenge_root_link();
 573     if (cur == nm) {
 574       if (last != NULL)
 575             last->set_scavenge_root_link(next);
 576       else  set_scavenge_root_nmethods(next);
 577       nm->set_scavenge_root_link(NULL);
 578       nm->clear_on_scavenge_root_list();
 579       return;
 580     }
 581     last = cur;
 582     cur = next;
 583   }
 584   assert(false, "should have been on list");
 585 }
 586 
 587 void CodeCache::prune_scavenge_root_nmethods() {
 588   assert_locked_or_safepoint(CodeCache_lock);
 589 
 590   if (UseG1GC) {
 591     return;
 592   }
 593 
 594   debug_only(mark_scavenge_root_nmethods());
 595 
 596   nmethod* last = NULL;
 597   nmethod* cur = scavenge_root_nmethods();
 598   while (cur != NULL) {
 599     nmethod* next = cur->scavenge_root_link();
 600     debug_only(cur->clear_scavenge_root_marked());
 601     assert(cur->scavenge_root_not_marked(), "");
 602     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 603 
 604     if (!cur->is_zombie() && !cur->is_unloaded()
 605         && cur->detect_scavenge_root_oops()) {
 606       // Keep it.  Advance 'last' to prevent deletion.
 607       last = cur;
 608     } else {
 609       // Prune it from the list, so we don't have to look at it any more.
 610       print_trace("prune_scavenge_root", cur);
 611       cur->set_scavenge_root_link(NULL);
 612       cur->clear_on_scavenge_root_list();
 613       if (last != NULL)
 614             last->set_scavenge_root_link(next);
 615       else  set_scavenge_root_nmethods(next);
 616     }
 617     cur = next;
 618   }
 619 
 620   // Check for stray marks.
 621   debug_only(verify_perm_nmethods(NULL));
 622 }
 623 
 624 #ifndef PRODUCT
 625 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
 626   if (UseG1GC) {
 627     return;
 628   }
 629 
 630   // While we are here, verify the integrity of the list.
 631   mark_scavenge_root_nmethods();
 632   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 633     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 634     cur->clear_scavenge_root_marked();
 635   }
 636   verify_perm_nmethods(f);
 637 }
 638 
 639 // Temporarily mark nmethods that are claimed to be on the non-perm list.
 640 void CodeCache::mark_scavenge_root_nmethods() {
 641   NMethodIterator iter;
 642   while(iter.next_alive()) {
 643     nmethod* nm = iter.method();
 644     assert(nm->scavenge_root_not_marked(), "clean state");
 645     if (nm->on_scavenge_root_list())
 646       nm->set_scavenge_root_marked();
 647   }
 648 }
 649 
 650 // If the closure is given, run it on the unlisted nmethods.
 651 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
 652 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
 653   NMethodIterator iter;
 654   while(iter.next_alive()) {
 655     nmethod* nm = iter.method();
 656     bool call_f = (f_or_null != NULL);
 657     assert(nm->scavenge_root_not_marked(), "must be already processed");
 658     if (nm->on_scavenge_root_list())
 659       call_f = false;  // don't show this one to the client
 660     nm->verify_scavenge_root_oops();
 661     if (call_f)  f_or_null->do_code_blob(nm);
 662   }
 663 }
 664 #endif //PRODUCT
 665 
 666 void CodeCache::verify_clean_inline_caches() {
 667 #ifdef ASSERT
 668   NMethodIterator iter;
 669   while(iter.next_alive()) {
 670     nmethod* nm = iter.method();
 671     assert(!nm->is_unloaded(), "Tautology");
 672     nm->verify_clean_inline_caches();
 673     nm->verify();
 674   }
 675 #endif
 676 }
 677 
 678 void CodeCache::verify_icholder_relocations() {
 679 #ifdef ASSERT
 680   // make sure that we aren't leaking icholders
 681   int count = 0;
 682   FOR_ALL_HEAPS(heap) {
 683     FOR_ALL_BLOBS(cb, *heap) {
 684       if (cb->is_nmethod()) {
 685         nmethod* nm = (nmethod*)cb;
 686         count += nm->verify_icholder_relocations();
 687       }
 688     }
 689   }
 690 
 691   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
 692          CompiledICHolder::live_count(), "must agree");
 693 #endif
 694 }
 695 
 696 void CodeCache::gc_prologue() {
 697 }
 698 
 699 void CodeCache::gc_epilogue() {
 700   assert_locked_or_safepoint(CodeCache_lock);
 701   NMethodIterator iter;
 702   while(iter.next_alive()) {
 703     nmethod* nm = iter.method();
 704     assert(!nm->is_unloaded(), "Tautology");
 705     if (needs_cache_clean()) {
 706       nm->cleanup_inline_caches();
 707     }
 708     DEBUG_ONLY(nm->verify());
 709     DEBUG_ONLY(nm->verify_oop_relocations());
 710   }
 711   set_needs_cache_clean(false);
 712   prune_scavenge_root_nmethods();
 713 
 714   verify_icholder_relocations();
 715 }
 716 
 717 void CodeCache::verify_oops() {
 718   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 719   VerifyOopClosure voc;
 720   NMethodIterator iter;
 721   while(iter.next_alive()) {
 722     nmethod* nm = iter.method();
 723     nm->oops_do(&voc);
 724     nm->verify_oop_relocations();
 725   }
 726 }
 727 
 728 size_t CodeCache::capacity() {
 729   size_t cap = 0;
 730   FOR_ALL_HEAPS(heap) {
 731     cap += (*heap)->capacity();
 732   }
 733   return cap;
 734 }
 735 
 736 size_t CodeCache::unallocated_capacity(int code_blob_type) {
 737   CodeHeap* heap = get_code_heap(code_blob_type);
 738   return (heap != NULL) ? heap->unallocated_capacity() : 0;
 739 }
 740 
 741 size_t CodeCache::unallocated_capacity() {
 742   size_t unallocated_cap = 0;
 743   FOR_ALL_HEAPS(heap) {
 744     unallocated_cap += (*heap)->unallocated_capacity();
 745   }
 746   return unallocated_cap;
 747 }
 748 
 749 size_t CodeCache::max_capacity() {
 750   size_t max_cap = 0;
 751   FOR_ALL_HEAPS(heap) {
 752     max_cap += (*heap)->max_capacity();
 753   }
 754   return max_cap;
 755 }
 756 
 757 /**
 758  * Returns true if a CodeHeap is full and sets code_blob_type accordingly.
 759  */
 760 bool CodeCache::is_full(int* code_blob_type) {
 761   FOR_ALL_HEAPS(heap_iterator) {
 762     CodeHeap* heap = *heap_iterator;
 763     // Do not check the non-nmethod code heap because we can store
 764     // non-nmethod code in the non-profiled code heap (see comment
 765     // 'fallback solution' in CodeCache::allocate).
 766     if (heap->code_blob_type() != CodeBlobType::NonNMethod &&
 767         heap->unallocated_capacity() < CodeCacheMinimumFreeSpace) {
 768       *code_blob_type = heap->code_blob_type();
 769       return true;
 770     }
 771   }
 772   return false;
 773 }
 774 
 775 /**
 776  * Returns the reverse free ratio. E.g., if 25% (1/4) of the code heap
 777  * is free, reverse_free_ratio() returns 4.
 778  */
 779 double CodeCache::reverse_free_ratio(int code_blob_type) {
 780   CodeHeap* heap = get_code_heap(code_blob_type);
 781   if (heap == NULL) {
 782     return 0;
 783   }
 784   double unallocated_capacity = (double)(heap->unallocated_capacity() - CodeCacheMinimumFreeSpace);
 785   double max_capacity = (double)heap->max_capacity();
 786   return max_capacity / unallocated_capacity;
 787 }
 788 
 789 size_t CodeCache::bytes_allocated_in_freelists() {
 790   size_t allocated_bytes = 0;
 791   FOR_ALL_HEAPS(heap) {
 792     allocated_bytes += (*heap)->allocated_in_freelist();
 793   }
 794   return allocated_bytes;
 795 }
 796 
 797 int CodeCache::allocated_segments() {
 798   int number_of_segments = 0;
 799   FOR_ALL_HEAPS(heap) {
 800     number_of_segments += (*heap)->allocated_segments();
 801   }
 802   return number_of_segments;
 803 }
 804 
 805 size_t CodeCache::freelists_length() {
 806   size_t length = 0;
 807   FOR_ALL_HEAPS(heap) {
 808     length += (*heap)->freelist_length();
 809   }
 810   return length;
 811 }
 812 
 813 void icache_init();
 814 
 815 void CodeCache::initialize() {
 816   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
 817 #ifdef COMPILER2
 818   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");
 819 #endif
 820   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");
 821   // This was originally just a check of the alignment, causing failure, instead, round
 822   // the code cache to the page size.  In particular, Solaris is moving to a larger
 823   // default page size.
 824   CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
 825 
 826   if (SegmentedCodeCache) {
 827     // Use multiple code heaps
 828     initialize_heaps();
 829   } else {
 830     // Use a single code heap
 831     ReservedCodeSpace rs = reserve_heap_memory(ReservedCodeCacheSize);
 832     add_heap(rs, "CodeCache", InitialCodeCacheSize, CodeBlobType::All);
 833   }
 834 
 835   // Initialize ICache flush mechanism
 836   // This service is needed for os::register_code_area
 837   icache_init();
 838 
 839   // Give OS a chance to register generated code area.
 840   // This is used on Windows 64 bit platforms to register
 841   // Structured Exception Handlers for our generated code.
 842   os::register_code_area((char*)low_bound(), (char*)high_bound());
 843 }
 844 
 845 void codeCache_init() {
 846   CodeCache::initialize();
 847 }
 848 
 849 //------------------------------------------------------------------------------------------------
 850 
 851 int CodeCache::number_of_nmethods_with_dependencies() {
 852   return _number_of_nmethods_with_dependencies;
 853 }
 854 
 855 void CodeCache::clear_inline_caches() {
 856   assert_locked_or_safepoint(CodeCache_lock);
 857   NMethodIterator iter;
 858   while(iter.next_alive()) {
 859     iter.method()->clear_inline_caches();
 860   }
 861 }
 862 
 863 // Keeps track of time spent for checking dependencies
 864 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
 865 
 866 int CodeCache::mark_for_deoptimization(DepChange& changes) {
 867   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 868   int number_of_marked_CodeBlobs = 0;
 869 
 870   // search the hierarchy looking for nmethods which are affected by the loading of this class
 871 
 872   // then search the interfaces this class implements looking for nmethods
 873   // which might be dependent of the fact that an interface only had one
 874   // implementor.
 875   // nmethod::check_all_dependencies works only correctly, if no safepoint
 876   // can happen
 877   No_Safepoint_Verifier nsv;
 878   for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
 879     Klass* d = str.klass();
 880     number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
 881   }
 882 
 883 #ifndef PRODUCT
 884   if (VerifyDependencies) {
 885     // Object pointers are used as unique identifiers for dependency arguments. This
 886     // is only possible if no safepoint, i.e., GC occurs during the verification code.
 887     dependentCheckTime.start();
 888     nmethod::check_all_dependencies(changes);
 889     dependentCheckTime.stop();
 890   }
 891 #endif
 892 
 893   return number_of_marked_CodeBlobs;
 894 }
 895 
 896 
 897 #ifdef HOTSWAP
 898 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
 899   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 900   int number_of_marked_CodeBlobs = 0;
 901 
 902   // Deoptimize all methods of the evolving class itself
 903   Array<Method*>* old_methods = dependee->methods();
 904   for (int i = 0; i < old_methods->length(); i++) {
 905     ResourceMark rm;
 906     Method* old_method = old_methods->at(i);
 907     nmethod *nm = old_method->code();
 908     if (nm != NULL) {
 909       nm->mark_for_deoptimization();
 910       number_of_marked_CodeBlobs++;
 911     }
 912   }
 913 
 914   NMethodIterator iter;
 915   while(iter.next_alive()) {
 916     nmethod* nm = iter.method();
 917     if (nm->is_marked_for_deoptimization()) {
 918       // ...Already marked in the previous pass; don't count it again.
 919     } else if (nm->is_evol_dependent_on(dependee())) {
 920       ResourceMark rm;
 921       nm->mark_for_deoptimization();
 922       number_of_marked_CodeBlobs++;
 923     } else  {
 924       // flush caches in case they refer to a redefined Method*
 925       nm->clear_inline_caches();
 926     }
 927   }
 928 
 929   return number_of_marked_CodeBlobs;
 930 }
 931 #endif // HOTSWAP
 932 
 933 
 934 // Deoptimize all methods
 935 void CodeCache::mark_all_nmethods_for_deoptimization() {
 936   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 937   NMethodIterator iter;
 938   while(iter.next_alive()) {
 939     nmethod* nm = iter.method();
 940     if (!nm->method()->is_method_handle_intrinsic()) {
 941       nm->mark_for_deoptimization();
 942     }
 943   }
 944 }
 945 
 946 int CodeCache::mark_for_deoptimization(Method* dependee) {
 947   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 948   int number_of_marked_CodeBlobs = 0;
 949 
 950   NMethodIterator iter;
 951   while(iter.next_alive()) {
 952     nmethod* nm = iter.method();
 953     if (nm->is_dependent_on_method(dependee)) {
 954       ResourceMark rm;
 955       nm->mark_for_deoptimization();
 956       number_of_marked_CodeBlobs++;
 957     }
 958   }
 959 
 960   return number_of_marked_CodeBlobs;
 961 }
 962 
 963 void CodeCache::make_marked_nmethods_zombies() {
 964   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 965   NMethodIterator iter;
 966   while(iter.next_alive()) {
 967     nmethod* nm = iter.method();
 968     if (nm->is_marked_for_deoptimization()) {
 969 
 970       // If the nmethod has already been made non-entrant and it can be converted
 971       // then zombie it now. Otherwise make it non-entrant and it will eventually
 972       // be zombied when it is no longer seen on the stack. Note that the nmethod
 973       // might be "entrant" and not on the stack and so could be zombied immediately
 974       // but we can't tell because we don't track it on stack until it becomes
 975       // non-entrant.
 976 
 977       if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
 978         nm->make_zombie();
 979       } else {
 980         nm->make_not_entrant();
 981       }
 982     }
 983   }
 984 }
 985 
 986 void CodeCache::make_marked_nmethods_not_entrant() {
 987   assert_locked_or_safepoint(CodeCache_lock);
 988   NMethodIterator iter;
 989   while(iter.next_alive()) {
 990     nmethod* nm = iter.method();
 991     if (nm->is_marked_for_deoptimization()) {
 992       nm->make_not_entrant();
 993     }
 994   }
 995 }
 996 
 997 void CodeCache::verify() {
 998   assert_locked_or_safepoint(CodeCache_lock);
 999   FOR_ALL_HEAPS(heap) {
1000     (*heap)->verify();
1001     FOR_ALL_BLOBS(cb, *heap) {
1002       if (cb->is_alive()) {
1003         cb->verify();
1004       }
1005     }
1006   }
1007 }
1008 
1009 // A CodeHeap is full. Print out warning and report event.
1010 void CodeCache::report_codemem_full(int code_blob_type, bool print) {
1011   // Get nmethod heap for the given CodeBlobType and build CodeCacheFull event
1012   CodeHeap* heap = get_code_heap(code_blob_type);
1013   assert(heap != NULL, "heap is null");
1014 
1015   if (!heap->was_full() || print) {
1016     // Not yet reported for this heap, report
1017     heap->report_full();
1018     if (SegmentedCodeCache) {
1019       warning("%s is full. Compiler has been disabled.", CodeCache::get_code_heap_name(code_blob_type));
1020       warning("Try increasing the code heap size using -XX:%s=",
1021           (code_blob_type == CodeBlobType::MethodProfiled) ? "ProfiledCodeHeapSize" : "NonProfiledCodeHeapSize");
1022     } else {
1023       warning("CodeCache is full. Compiler has been disabled.");
1024       warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1025     }
1026     ResourceMark rm;
1027     stringStream s;
1028     // Dump code cache  into a buffer before locking the tty,
1029     {
1030       MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1031       print_summary(&s);
1032     }
1033     ttyLocker ttyl;
1034     tty->print("%s", s.as_string());
1035   }
1036 
1037   _codemem_full_count++;
1038   EventCodeCacheFull event;
1039   if (event.should_commit()) {
1040     event.set_codeBlobType((u1)code_blob_type);
1041     event.set_startAddress((u8)heap->low_boundary());
1042     event.set_commitedTopAddress((u8)heap->high());
1043     event.set_reservedTopAddress((u8)heap->high_boundary());
1044     event.set_entryCount(nof_blobs());
1045     event.set_methodCount(nof_nmethods());
1046     event.set_adaptorCount(nof_adapters());
1047     event.set_unallocatedCapacity(heap->unallocated_capacity()/K);
1048     event.set_fullCount(_codemem_full_count);
1049     event.commit();
1050   }
1051 }
1052 
1053 void CodeCache::print_memory_overhead() {
1054   size_t wasted_bytes = 0;
1055   FOR_ALL_HEAPS(heap) {
1056       CodeHeap* curr_heap = *heap;
1057       for (CodeBlob* cb = (CodeBlob*)curr_heap->first(); cb != NULL; cb = (CodeBlob*)curr_heap->next(cb)) {
1058         HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
1059         wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
1060       }
1061   }
1062   // Print bytes that are allocated in the freelist
1063   ttyLocker ttl;
1064   tty->print_cr("Number of elements in freelist: " SSIZE_FORMAT,       freelists_length());
1065   tty->print_cr("Allocated in freelist:          " SSIZE_FORMAT "kB",  bytes_allocated_in_freelists()/K);
1066   tty->print_cr("Unused bytes in CodeBlobs:      " SSIZE_FORMAT "kB",  (wasted_bytes/K));
1067   tty->print_cr("Segment map size:               " SSIZE_FORMAT "kB",  allocated_segments()/K); // 1 byte per segment
1068 }
1069 
1070 //------------------------------------------------------------------------------------------------
1071 // Non-product version
1072 
1073 #ifndef PRODUCT
1074 
1075 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
1076   if (PrintCodeCache2) {  // Need to add a new flag
1077     ResourceMark rm;
1078     if (size == 0)  size = cb->size();
1079     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
1080   }
1081 }
1082 
1083 void CodeCache::print_internals() {
1084   int nmethodCount = 0;
1085   int runtimeStubCount = 0;
1086   int adapterCount = 0;
1087   int deoptimizationStubCount = 0;
1088   int uncommonTrapStubCount = 0;
1089   int bufferBlobCount = 0;
1090   int total = 0;
1091   int nmethodAlive = 0;
1092   int nmethodNotEntrant = 0;
1093   int nmethodZombie = 0;
1094   int nmethodUnloaded = 0;
1095   int nmethodJava = 0;
1096   int nmethodNative = 0;
1097   int max_nm_size = 0;
1098   ResourceMark rm;
1099 
1100   int i = 0;
1101   FOR_ALL_HEAPS(heap) {
1102     if (SegmentedCodeCache && Verbose) {
1103       tty->print_cr("-- %s --", (*heap)->name());
1104     }
1105     FOR_ALL_BLOBS(cb, *heap) {
1106       total++;
1107       if (cb->is_nmethod()) {
1108         nmethod* nm = (nmethod*)cb;
1109 
1110         if (Verbose && nm->method() != NULL) {
1111           ResourceMark rm;
1112           char *method_name = nm->method()->name_and_sig_as_C_string();
1113           tty->print("%s", method_name);
1114           if(nm->is_alive()) { tty->print_cr(" alive"); }
1115           if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
1116           if(nm->is_zombie()) { tty->print_cr(" zombie"); }
1117         }
1118 
1119         nmethodCount++;
1120 
1121         if(nm->is_alive()) { nmethodAlive++; }
1122         if(nm->is_not_entrant()) { nmethodNotEntrant++; }
1123         if(nm->is_zombie()) { nmethodZombie++; }
1124         if(nm->is_unloaded()) { nmethodUnloaded++; }
1125         if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }
1126 
1127         if(nm->method() != NULL && nm->is_java_method()) {
1128           nmethodJava++;
1129           max_nm_size = MAX2(max_nm_size, nm->size());
1130         }
1131       } else if (cb->is_runtime_stub()) {
1132         runtimeStubCount++;
1133       } else if (cb->is_deoptimization_stub()) {
1134         deoptimizationStubCount++;
1135       } else if (cb->is_uncommon_trap_stub()) {
1136         uncommonTrapStubCount++;
1137       } else if (cb->is_adapter_blob()) {
1138         adapterCount++;
1139       } else if (cb->is_buffer_blob()) {
1140         bufferBlobCount++;
1141       }
1142     }
1143   }
1144 
1145   int bucketSize = 512;
1146   int bucketLimit = max_nm_size / bucketSize + 1;
1147   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
1148   memset(buckets, 0, sizeof(int) * bucketLimit);
1149 
1150   NMethodIterator iter;
1151   while(iter.next()) {
1152     nmethod* nm = iter.method();
1153     if(nm->method() != NULL && nm->is_java_method()) {
1154       buckets[nm->size() / bucketSize]++;
1155     }
1156   }
1157 
1158   tty->print_cr("Code Cache Entries (total of %d)",total);
1159   tty->print_cr("-------------------------------------------------");
1160   tty->print_cr("nmethods: %d",nmethodCount);
1161   tty->print_cr("\talive: %d",nmethodAlive);
1162   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
1163   tty->print_cr("\tzombie: %d",nmethodZombie);
1164   tty->print_cr("\tunloaded: %d",nmethodUnloaded);
1165   tty->print_cr("\tjava: %d",nmethodJava);
1166   tty->print_cr("\tnative: %d",nmethodNative);
1167   tty->print_cr("runtime_stubs: %d",runtimeStubCount);
1168   tty->print_cr("adapters: %d",adapterCount);
1169   tty->print_cr("buffer blobs: %d",bufferBlobCount);
1170   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
1171   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
1172   tty->print_cr("\nnmethod size distribution (non-zombie java)");
1173   tty->print_cr("-------------------------------------------------");
1174 
1175   for(int i=0; i<bucketLimit; i++) {
1176     if(buckets[i] != 0) {
1177       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
1178       tty->fill_to(40);
1179       tty->print_cr("%d",buckets[i]);
1180     }
1181   }
1182 
1183   FREE_C_HEAP_ARRAY(int, buckets, mtCode);
1184   print_memory_overhead();
1185 }
1186 
1187 #endif // !PRODUCT
1188 
1189 void CodeCache::print() {
1190   print_summary(tty);
1191 
1192 #ifndef PRODUCT
1193   if (!Verbose) return;
1194 
1195   CodeBlob_sizes live;
1196   CodeBlob_sizes dead;
1197 
1198   FOR_ALL_HEAPS(heap) {
1199     FOR_ALL_BLOBS(cb, *heap) {
1200       if (!cb->is_alive()) {
1201         dead.add(cb);
1202       } else {
1203         live.add(cb);
1204       }
1205     }
1206   }
1207 
1208   tty->print_cr("CodeCache:");
1209   tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
1210 
1211   if (!live.is_empty()) {
1212     live.print("live");
1213   }
1214   if (!dead.is_empty()) {
1215     dead.print("dead");
1216   }
1217 
1218   if (WizardMode) {
1219      // print the oop_map usage
1220     int code_size = 0;
1221     int number_of_blobs = 0;
1222     int number_of_oop_maps = 0;
1223     int map_size = 0;
1224     FOR_ALL_HEAPS(heap) {
1225       FOR_ALL_BLOBS(cb, *heap) {
1226         if (cb->is_alive()) {
1227           number_of_blobs++;
1228           code_size += cb->code_size();
1229           OopMapSet* set = cb->oop_maps();
1230           if (set != NULL) {
1231             number_of_oop_maps += set->size();
1232             map_size           += set->heap_size();
1233           }
1234         }
1235       }
1236     }
1237     tty->print_cr("OopMaps");
1238     tty->print_cr("  #blobs    = %d", number_of_blobs);
1239     tty->print_cr("  code size = %d", code_size);
1240     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);
1241     tty->print_cr("  map size  = %d", map_size);
1242   }
1243 
1244 #endif // !PRODUCT
1245 }
1246 
1247 void CodeCache::print_summary(outputStream* st, bool detailed) {
1248   FOR_ALL_HEAPS(heap_iterator) {
1249     CodeHeap* heap = (*heap_iterator);
1250     size_t total = (heap->high_boundary() - heap->low_boundary());
1251     if (SegmentedCodeCache) {
1252       st->print("%s:", heap->name());
1253     } else {
1254       st->print("CodeCache:");
1255     }
1256     st->print_cr(" size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
1257                  "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
1258                  total/K, (total - heap->unallocated_capacity())/K,
1259                  heap->max_allocated_capacity()/K, heap->unallocated_capacity()/K);
1260 
1261     if (detailed) {
1262       st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
1263                    p2i(heap->low_boundary()),
1264                    p2i(heap->high()),
1265                    p2i(heap->high_boundary()));
1266     }
1267   }
1268 
1269   if (detailed) {
1270     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
1271                        " adapters=" UINT32_FORMAT,
1272                        nof_blobs(), nof_nmethods(), nof_adapters());
1273     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
1274                  "enabled" : Arguments::mode() == Arguments::_int ?
1275                  "disabled (interpreter mode)" :
1276                  "disabled (not enough contiguous free space left)");
1277   }
1278 }
1279 
1280 void CodeCache::print_codelist(outputStream* st) {
1281   assert_locked_or_safepoint(CodeCache_lock);
1282 
1283   NMethodIterator iter;
1284   while(iter.next_alive()) {
1285     nmethod* nm = iter.method();
1286     ResourceMark rm;
1287     char *method_name = nm->method()->name_and_sig_as_C_string();
1288     st->print_cr("%d %d %s ["INTPTR_FORMAT", "INTPTR_FORMAT" - "INTPTR_FORMAT"]",
1289                  nm->compile_id(), nm->comp_level(), method_name, (intptr_t)nm->header_begin(),
1290                  (intptr_t)nm->code_begin(), (intptr_t)nm->code_end());
1291   }
1292 }
1293 
1294 void CodeCache::print_layout(outputStream* st) {
1295   assert_locked_or_safepoint(CodeCache_lock);
1296   ResourceMark rm;
1297 
1298   print_summary(st, true);
1299 }
1300 
1301 void CodeCache::log_state(outputStream* st) {
1302   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1303             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
1304             nof_blobs(), nof_nmethods(), nof_adapters(),
1305             unallocated_capacity());
1306 }
--- EOF ---