1 /*
   2  * Copyright (c) 1997, 2019, 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 "jvm.h"
  27 #include "code/codeCache.hpp"
  28 #include "code/compiledIC.hpp"
  29 #include "code/compiledMethod.inline.hpp"
  30 #include "code/dependencies.hpp"
  31 #include "code/nativeInst.hpp"
  32 #include "code/nmethod.hpp"
  33 #include "code/scopeDesc.hpp"
  34 #include "compiler/abstractCompiler.hpp"
  35 #include "compiler/compileBroker.hpp"
  36 #include "compiler/compileLog.hpp"
  37 #include "compiler/compilerDirectives.hpp"
  38 #include "compiler/directivesParser.hpp"
  39 #include "compiler/disassembler.hpp"
  40 #include "interpreter/bytecode.hpp"
  41 #include "logging/log.hpp"
  42 #include "logging/logStream.hpp"
  43 #include "memory/allocation.inline.hpp"
  44 #include "memory/resourceArea.hpp"
  45 #include "oops/access.inline.hpp"
  46 #include "oops/method.inline.hpp"
  47 #include "oops/methodData.hpp"
  48 #include "oops/oop.inline.hpp"
  49 #include "prims/jvmtiImpl.hpp"
  50 #include "runtime/atomic.hpp"
  51 #include "runtime/flags/flagSetting.hpp"
  52 #include "runtime/frame.inline.hpp"
  53 #include "runtime/handles.inline.hpp"
  54 #include "runtime/jniHandles.inline.hpp"
  55 #include "runtime/orderAccess.hpp"
  56 #include "runtime/os.hpp"
  57 #include "runtime/safepointVerifiers.hpp"
  58 #include "runtime/sharedRuntime.hpp"
  59 #include "runtime/sweeper.hpp"
  60 #include "runtime/vmThread.hpp"
  61 #include "utilities/align.hpp"
  62 #include "utilities/dtrace.hpp"
  63 #include "utilities/events.hpp"
  64 #include "utilities/resourceHash.hpp"
  65 #include "utilities/xmlstream.hpp"
  66 #if INCLUDE_JVMCI
  67 #include "jvmci/jvmciJavaClasses.hpp"
  68 #endif
  69 
  70 #ifdef DTRACE_ENABLED
  71 
  72 // Only bother with this argument setup if dtrace is available
  73 
  74 #define DTRACE_METHOD_UNLOAD_PROBE(method)                                \
  75   {                                                                       \
  76     Method* m = (method);                                                 \
  77     if (m != NULL) {                                                      \
  78       Symbol* klass_name = m->klass_name();                               \
  79       Symbol* name = m->name();                                           \
  80       Symbol* signature = m->signature();                                 \
  81       HOTSPOT_COMPILED_METHOD_UNLOAD(                                     \
  82         (char *) klass_name->bytes(), klass_name->utf8_length(),                   \
  83         (char *) name->bytes(), name->utf8_length(),                               \
  84         (char *) signature->bytes(), signature->utf8_length());                    \
  85     }                                                                     \
  86   }
  87 
  88 #else //  ndef DTRACE_ENABLED
  89 
  90 #define DTRACE_METHOD_UNLOAD_PROBE(method)
  91 
  92 #endif
  93 
  94 //---------------------------------------------------------------------------------
  95 // NMethod statistics
  96 // They are printed under various flags, including:
  97 //   PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
  98 // (In the latter two cases, they like other stats are printed to the log only.)
  99 
 100 #ifndef PRODUCT
 101 // These variables are put into one block to reduce relocations
 102 // and make it simpler to print from the debugger.
 103 struct java_nmethod_stats_struct {
 104   int nmethod_count;
 105   int total_size;
 106   int relocation_size;
 107   int consts_size;
 108   int insts_size;
 109   int stub_size;
 110   int scopes_data_size;
 111   int scopes_pcs_size;
 112   int dependencies_size;
 113   int handler_table_size;
 114   int nul_chk_table_size;
 115   int oops_size;
 116   int metadata_size;
 117 
 118   void note_nmethod(nmethod* nm) {
 119     nmethod_count += 1;
 120     total_size          += nm->size();
 121     relocation_size     += nm->relocation_size();
 122     consts_size         += nm->consts_size();
 123     insts_size          += nm->insts_size();
 124     stub_size           += nm->stub_size();
 125     oops_size           += nm->oops_size();
 126     metadata_size       += nm->metadata_size();
 127     scopes_data_size    += nm->scopes_data_size();
 128     scopes_pcs_size     += nm->scopes_pcs_size();
 129     dependencies_size   += nm->dependencies_size();
 130     handler_table_size  += nm->handler_table_size();
 131     nul_chk_table_size  += nm->nul_chk_table_size();
 132   }
 133   void print_nmethod_stats(const char* name) {
 134     if (nmethod_count == 0)  return;
 135     tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
 136     if (total_size != 0)          tty->print_cr(" total in heap  = %d", total_size);
 137     if (nmethod_count != 0)       tty->print_cr(" header         = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
 138     if (relocation_size != 0)     tty->print_cr(" relocation     = %d", relocation_size);
 139     if (consts_size != 0)         tty->print_cr(" constants      = %d", consts_size);
 140     if (insts_size != 0)          tty->print_cr(" main code      = %d", insts_size);
 141     if (stub_size != 0)           tty->print_cr(" stub code      = %d", stub_size);
 142     if (oops_size != 0)           tty->print_cr(" oops           = %d", oops_size);
 143     if (metadata_size != 0)       tty->print_cr(" metadata       = %d", metadata_size);
 144     if (scopes_data_size != 0)    tty->print_cr(" scopes data    = %d", scopes_data_size);
 145     if (scopes_pcs_size != 0)     tty->print_cr(" scopes pcs     = %d", scopes_pcs_size);
 146     if (dependencies_size != 0)   tty->print_cr(" dependencies   = %d", dependencies_size);
 147     if (handler_table_size != 0)  tty->print_cr(" handler table  = %d", handler_table_size);
 148     if (nul_chk_table_size != 0)  tty->print_cr(" nul chk table  = %d", nul_chk_table_size);
 149   }
 150 };
 151 
 152 struct native_nmethod_stats_struct {
 153   int native_nmethod_count;
 154   int native_total_size;
 155   int native_relocation_size;
 156   int native_insts_size;
 157   int native_oops_size;
 158   int native_metadata_size;
 159   void note_native_nmethod(nmethod* nm) {
 160     native_nmethod_count += 1;
 161     native_total_size       += nm->size();
 162     native_relocation_size  += nm->relocation_size();
 163     native_insts_size       += nm->insts_size();
 164     native_oops_size        += nm->oops_size();
 165     native_metadata_size    += nm->metadata_size();
 166   }
 167   void print_native_nmethod_stats() {
 168     if (native_nmethod_count == 0)  return;
 169     tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
 170     if (native_total_size != 0)       tty->print_cr(" N. total size  = %d", native_total_size);
 171     if (native_relocation_size != 0)  tty->print_cr(" N. relocation  = %d", native_relocation_size);
 172     if (native_insts_size != 0)       tty->print_cr(" N. main code   = %d", native_insts_size);
 173     if (native_oops_size != 0)        tty->print_cr(" N. oops        = %d", native_oops_size);
 174     if (native_metadata_size != 0)    tty->print_cr(" N. metadata    = %d", native_metadata_size);
 175   }
 176 };
 177 
 178 struct pc_nmethod_stats_struct {
 179   int pc_desc_resets;   // number of resets (= number of caches)
 180   int pc_desc_queries;  // queries to nmethod::find_pc_desc
 181   int pc_desc_approx;   // number of those which have approximate true
 182   int pc_desc_repeats;  // number of _pc_descs[0] hits
 183   int pc_desc_hits;     // number of LRU cache hits
 184   int pc_desc_tests;    // total number of PcDesc examinations
 185   int pc_desc_searches; // total number of quasi-binary search steps
 186   int pc_desc_adds;     // number of LUR cache insertions
 187 
 188   void print_pc_stats() {
 189     tty->print_cr("PcDesc Statistics:  %d queries, %.2f comparisons per query",
 190                   pc_desc_queries,
 191                   (double)(pc_desc_tests + pc_desc_searches)
 192                   / pc_desc_queries);
 193     tty->print_cr("  caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
 194                   pc_desc_resets,
 195                   pc_desc_queries, pc_desc_approx,
 196                   pc_desc_repeats, pc_desc_hits,
 197                   pc_desc_tests, pc_desc_searches, pc_desc_adds);
 198   }
 199 };
 200 
 201 #ifdef COMPILER1
 202 static java_nmethod_stats_struct c1_java_nmethod_stats;
 203 #endif
 204 #ifdef COMPILER2
 205 static java_nmethod_stats_struct c2_java_nmethod_stats;
 206 #endif
 207 #if INCLUDE_JVMCI
 208 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
 209 #endif
 210 static java_nmethod_stats_struct unknown_java_nmethod_stats;
 211 
 212 static native_nmethod_stats_struct native_nmethod_stats;
 213 static pc_nmethod_stats_struct pc_nmethod_stats;
 214 
 215 static void note_java_nmethod(nmethod* nm) {
 216 #ifdef COMPILER1
 217   if (nm->is_compiled_by_c1()) {
 218     c1_java_nmethod_stats.note_nmethod(nm);
 219   } else
 220 #endif
 221 #ifdef COMPILER2
 222   if (nm->is_compiled_by_c2()) {
 223     c2_java_nmethod_stats.note_nmethod(nm);
 224   } else
 225 #endif
 226 #if INCLUDE_JVMCI
 227   if (nm->is_compiled_by_jvmci()) {
 228     jvmci_java_nmethod_stats.note_nmethod(nm);
 229   } else
 230 #endif
 231   {
 232     unknown_java_nmethod_stats.note_nmethod(nm);
 233   }
 234 }
 235 #endif // !PRODUCT
 236 
 237 //---------------------------------------------------------------------------------
 238 
 239 
 240 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
 241   assert(pc != NULL, "Must be non null");
 242   assert(exception.not_null(), "Must be non null");
 243   assert(handler != NULL, "Must be non null");
 244 
 245   _count = 0;
 246   _exception_type = exception->klass();
 247   _next = NULL;
 248   _purge_list_next = NULL;
 249 
 250   add_address_and_handler(pc,handler);
 251 }
 252 
 253 
 254 address ExceptionCache::match(Handle exception, address pc) {
 255   assert(pc != NULL,"Must be non null");
 256   assert(exception.not_null(),"Must be non null");
 257   if (exception->klass() == exception_type()) {
 258     return (test_address(pc));
 259   }
 260 
 261   return NULL;
 262 }
 263 
 264 
 265 bool ExceptionCache::match_exception_with_space(Handle exception) {
 266   assert(exception.not_null(),"Must be non null");
 267   if (exception->klass() == exception_type() && count() < cache_size) {
 268     return true;
 269   }
 270   return false;
 271 }
 272 
 273 
 274 address ExceptionCache::test_address(address addr) {
 275   int limit = count();
 276   for (int i = 0; i < limit; i++) {
 277     if (pc_at(i) == addr) {
 278       return handler_at(i);
 279     }
 280   }
 281   return NULL;
 282 }
 283 
 284 
 285 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
 286   if (test_address(addr) == handler) return true;
 287 
 288   int index = count();
 289   if (index < cache_size) {
 290     set_pc_at(index, addr);
 291     set_handler_at(index, handler);
 292     increment_count();
 293     return true;
 294   }
 295   return false;
 296 }
 297 
 298 ExceptionCache* ExceptionCache::next() {
 299   return Atomic::load(&_next);
 300 }
 301 
 302 void ExceptionCache::set_next(ExceptionCache *ec) {
 303   Atomic::store(ec, &_next);
 304 }
 305 
 306 //-----------------------------------------------------------------------------
 307 
 308 
 309 // Helper used by both find_pc_desc methods.
 310 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
 311   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
 312   if (!approximate)
 313     return pc->pc_offset() == pc_offset;
 314   else
 315     return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
 316 }
 317 
 318 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
 319   if (initial_pc_desc == NULL) {
 320     _pc_descs[0] = NULL; // native method; no PcDescs at all
 321     return;
 322   }
 323   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
 324   // reset the cache by filling it with benign (non-null) values
 325   assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
 326   for (int i = 0; i < cache_size; i++)
 327     _pc_descs[i] = initial_pc_desc;
 328 }
 329 
 330 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
 331   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
 332   NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
 333 
 334   // Note: one might think that caching the most recently
 335   // read value separately would be a win, but one would be
 336   // wrong.  When many threads are updating it, the cache
 337   // line it's in would bounce between caches, negating
 338   // any benefit.
 339 
 340   // In order to prevent race conditions do not load cache elements
 341   // repeatedly, but use a local copy:
 342   PcDesc* res;
 343 
 344   // Step one:  Check the most recently added value.
 345   res = _pc_descs[0];
 346   if (res == NULL) return NULL;  // native method; no PcDescs at all
 347   if (match_desc(res, pc_offset, approximate)) {
 348     NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
 349     return res;
 350   }
 351 
 352   // Step two:  Check the rest of the LRU cache.
 353   for (int i = 1; i < cache_size; ++i) {
 354     res = _pc_descs[i];
 355     if (res->pc_offset() < 0) break;  // optimization: skip empty cache
 356     if (match_desc(res, pc_offset, approximate)) {
 357       NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
 358       return res;
 359     }
 360   }
 361 
 362   // Report failure.
 363   return NULL;
 364 }
 365 
 366 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
 367   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
 368   // Update the LRU cache by shifting pc_desc forward.
 369   for (int i = 0; i < cache_size; i++)  {
 370     PcDesc* next = _pc_descs[i];
 371     _pc_descs[i] = pc_desc;
 372     pc_desc = next;
 373   }
 374 }
 375 
 376 // adjust pcs_size so that it is a multiple of both oopSize and
 377 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
 378 // of oopSize, then 2*sizeof(PcDesc) is)
 379 static int adjust_pcs_size(int pcs_size) {
 380   int nsize = align_up(pcs_size,   oopSize);
 381   if ((nsize % sizeof(PcDesc)) != 0) {
 382     nsize = pcs_size + sizeof(PcDesc);
 383   }
 384   assert((nsize % oopSize) == 0, "correct alignment");
 385   return nsize;
 386 }
 387 
 388 
 389 int nmethod::total_size() const {
 390   return
 391     consts_size()        +
 392     insts_size()         +
 393     stub_size()          +
 394     scopes_data_size()   +
 395     scopes_pcs_size()    +
 396     handler_table_size() +
 397     nul_chk_table_size();
 398 }
 399 
 400 address* nmethod::orig_pc_addr(const frame* fr) {
 401   return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
 402 }
 403 
 404 const char* nmethod::compile_kind() const {
 405   if (is_osr_method())     return "osr";
 406   if (method() != NULL && is_native_method())  return "c2n";
 407   return NULL;
 408 }
 409 
 410 // Fill in default values for various flag fields
 411 void nmethod::init_defaults() {
 412   _state                      = not_installed;
 413   _has_flushed_dependencies   = 0;
 414   _lock_count                 = 0;
 415   _stack_traversal_mark       = 0;
 416   _unload_reported            = false; // jvmti state
 417   _is_far_code                = false; // nmethods are located in CodeCache
 418 
 419 #ifdef ASSERT
 420   _oops_are_stale             = false;
 421 #endif
 422 
 423   _oops_do_mark_link       = NULL;
 424   _jmethod_id              = NULL;
 425   _osr_link                = NULL;
 426   _scavenge_root_link      = NULL;
 427   _scavenge_root_state     = 0;
 428 #if INCLUDE_RTM_OPT
 429   _rtm_state               = NoRTM;
 430 #endif
 431 #if INCLUDE_JVMCI
 432   _jvmci_installed_code   = NULL;
 433   _speculation_log        = NULL;
 434   _jvmci_installed_code_triggers_invalidation = false;
 435 #endif
 436 }
 437 
 438 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
 439   int compile_id,
 440   CodeBuffer *code_buffer,
 441   int vep_offset,
 442   int frame_complete,
 443   int frame_size,
 444   ByteSize basic_lock_owner_sp_offset,
 445   ByteSize basic_lock_sp_offset,
 446   OopMapSet* oop_maps) {
 447   code_buffer->finalize_oop_references(method);
 448   // create nmethod
 449   nmethod* nm = NULL;
 450   {
 451     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 452     int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
 453     CodeOffsets offsets;
 454     offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
 455     offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
 456     nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
 457                                             compile_id, &offsets,
 458                                             code_buffer, frame_size,
 459                                             basic_lock_owner_sp_offset,
 460                                             basic_lock_sp_offset, oop_maps);
 461     NOT_PRODUCT(if (nm != NULL)  native_nmethod_stats.note_native_nmethod(nm));
 462   }
 463 
 464   if (nm != NULL) {
 465     // verify nmethod
 466     debug_only(nm->verify();) // might block
 467 
 468     nm->log_new_nmethod();
 469     nm->make_in_use();
 470   }
 471   return nm;
 472 }
 473 
 474 nmethod* nmethod::new_nmethod(const methodHandle& method,
 475   int compile_id,
 476   int entry_bci,
 477   CodeOffsets* offsets,
 478   int orig_pc_offset,
 479   DebugInformationRecorder* debug_info,
 480   Dependencies* dependencies,
 481   CodeBuffer* code_buffer, int frame_size,
 482   OopMapSet* oop_maps,
 483   ExceptionHandlerTable* handler_table,
 484   ImplicitExceptionTable* nul_chk_table,
 485   AbstractCompiler* compiler,
 486   int comp_level
 487 #if INCLUDE_JVMCI
 488   , jweak installed_code,
 489   jweak speculationLog
 490 #endif
 491 )
 492 {
 493   assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
 494   code_buffer->finalize_oop_references(method);
 495   // create nmethod
 496   nmethod* nm = NULL;
 497   { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 498     int nmethod_size =
 499       CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
 500       + adjust_pcs_size(debug_info->pcs_size())
 501       + align_up((int)dependencies->size_in_bytes(), oopSize)
 502       + align_up(handler_table->size_in_bytes()    , oopSize)
 503       + align_up(nul_chk_table->size_in_bytes()    , oopSize)
 504       + align_up(debug_info->data_size()           , oopSize);
 505 
 506     nm = new (nmethod_size, comp_level)
 507     nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
 508             orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
 509             oop_maps,
 510             handler_table,
 511             nul_chk_table,
 512             compiler,
 513             comp_level
 514 #if INCLUDE_JVMCI
 515             , installed_code,
 516             speculationLog
 517 #endif
 518             );
 519 
 520     if (nm != NULL) {
 521       // To make dependency checking during class loading fast, record
 522       // the nmethod dependencies in the classes it is dependent on.
 523       // This allows the dependency checking code to simply walk the
 524       // class hierarchy above the loaded class, checking only nmethods
 525       // which are dependent on those classes.  The slow way is to
 526       // check every nmethod for dependencies which makes it linear in
 527       // the number of methods compiled.  For applications with a lot
 528       // classes the slow way is too slow.
 529       for (Dependencies::DepStream deps(nm); deps.next(); ) {
 530         if (deps.type() == Dependencies::call_site_target_value) {
 531           // CallSite dependencies are managed on per-CallSite instance basis.
 532           oop call_site = deps.argument_oop(0);
 533           MethodHandles::add_dependent_nmethod(call_site, nm);
 534         } else {
 535           Klass* klass = deps.context_type();
 536           if (klass == NULL) {
 537             continue;  // ignore things like evol_method
 538           }
 539           // record this nmethod as dependent on this klass
 540           InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
 541         }
 542       }
 543       NOT_PRODUCT(if (nm != NULL)  note_java_nmethod(nm));
 544     }
 545   }
 546   // Do verification and logging outside CodeCache_lock.
 547   if (nm != NULL) {
 548     // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
 549     DEBUG_ONLY(nm->verify();)
 550     nm->log_new_nmethod();
 551   }
 552   return nm;
 553 }
 554 
 555 // For native wrappers
 556 nmethod::nmethod(
 557   Method* method,
 558   CompilerType type,
 559   int nmethod_size,
 560   int compile_id,
 561   CodeOffsets* offsets,
 562   CodeBuffer* code_buffer,
 563   int frame_size,
 564   ByteSize basic_lock_owner_sp_offset,
 565   ByteSize basic_lock_sp_offset,
 566   OopMapSet* oop_maps )
 567   : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
 568   _is_unloading_state(0),
 569   _native_receiver_sp_offset(basic_lock_owner_sp_offset),
 570   _native_basic_lock_sp_offset(basic_lock_sp_offset)
 571 {
 572   {
 573     int scopes_data_offset = 0;
 574     int deoptimize_offset       = 0;
 575     int deoptimize_mh_offset    = 0;
 576 
 577     debug_only(NoSafepointVerifier nsv;)
 578     assert_locked_or_safepoint(CodeCache_lock);
 579 
 580     init_defaults();
 581     _entry_bci               = InvocationEntryBci;
 582     // We have no exception handler or deopt handler make the
 583     // values something that will never match a pc like the nmethod vtable entry
 584     _exception_offset        = 0;
 585     _orig_pc_offset          = 0;
 586 
 587     _consts_offset           = data_offset();
 588     _stub_offset             = data_offset();
 589     _oops_offset             = data_offset();
 590     _metadata_offset         = _oops_offset         + align_up(code_buffer->total_oop_size(), oopSize);
 591     scopes_data_offset       = _metadata_offset     + align_up(code_buffer->total_metadata_size(), wordSize);
 592     _scopes_pcs_offset       = scopes_data_offset;
 593     _dependencies_offset     = _scopes_pcs_offset;
 594     _handler_table_offset    = _dependencies_offset;
 595     _nul_chk_table_offset    = _handler_table_offset;
 596     _nmethod_end_offset      = _nul_chk_table_offset;
 597     _compile_id              = compile_id;
 598     _comp_level              = CompLevel_none;
 599     _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
 600     _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
 601     _osr_entry_point         = NULL;
 602     _exception_cache         = NULL;
 603     _pc_desc_container.reset_to(NULL);
 604     _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
 605 
 606     _scopes_data_begin = (address) this + scopes_data_offset;
 607     _deopt_handler_begin = (address) this + deoptimize_offset;
 608     _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
 609 
 610     code_buffer->copy_code_and_locs_to(this);
 611     code_buffer->copy_values_to(this);
 612 
 613     clear_unloading_state();
 614     if (ScavengeRootsInCode) {
 615       Universe::heap()->register_nmethod(this);
 616     }
 617     debug_only(Universe::heap()->verify_nmethod(this));
 618     CodeCache::commit(this);
 619   }
 620 
 621   if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
 622     ttyLocker ttyl;  // keep the following output all in one block
 623     // This output goes directly to the tty, not the compiler log.
 624     // To enable tools to match it up with the compilation activity,
 625     // be sure to tag this tty output with the compile ID.
 626     if (xtty != NULL) {
 627       xtty->begin_head("print_native_nmethod");
 628       xtty->method(_method);
 629       xtty->stamp();
 630       xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
 631     }
 632     // print the header part first
 633     print();
 634     // then print the requested information
 635     if (PrintNativeNMethods) {
 636       print_code();
 637       if (oop_maps != NULL) {
 638         oop_maps->print();
 639       }
 640     }
 641     if (PrintRelocations) {
 642       print_relocations();
 643     }
 644     if (xtty != NULL) {
 645       xtty->tail("print_native_nmethod");
 646     }
 647   }
 648 }
 649 
 650 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
 651   return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
 652 }
 653 
 654 nmethod::nmethod(
 655   Method* method,
 656   CompilerType type,
 657   int nmethod_size,
 658   int compile_id,
 659   int entry_bci,
 660   CodeOffsets* offsets,
 661   int orig_pc_offset,
 662   DebugInformationRecorder* debug_info,
 663   Dependencies* dependencies,
 664   CodeBuffer *code_buffer,
 665   int frame_size,
 666   OopMapSet* oop_maps,
 667   ExceptionHandlerTable* handler_table,
 668   ImplicitExceptionTable* nul_chk_table,
 669   AbstractCompiler* compiler,
 670   int comp_level
 671 #if INCLUDE_JVMCI
 672   , jweak installed_code,
 673   jweak speculation_log
 674 #endif
 675   )
 676   : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
 677   _is_unloading_state(0),
 678   _native_receiver_sp_offset(in_ByteSize(-1)),
 679   _native_basic_lock_sp_offset(in_ByteSize(-1))
 680 {
 681   assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
 682   {
 683     debug_only(NoSafepointVerifier nsv;)
 684     assert_locked_or_safepoint(CodeCache_lock);
 685 
 686     _deopt_handler_begin = (address) this;
 687     _deopt_mh_handler_begin = (address) this;
 688 
 689     init_defaults();
 690     _entry_bci               = entry_bci;
 691     _compile_id              = compile_id;
 692     _comp_level              = comp_level;
 693     _orig_pc_offset          = orig_pc_offset;
 694     _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
 695 
 696     // Section offsets
 697     _consts_offset           = content_offset()      + code_buffer->total_offset_of(code_buffer->consts());
 698     _stub_offset             = content_offset()      + code_buffer->total_offset_of(code_buffer->stubs());
 699     set_ctable_begin(header_begin() + _consts_offset);
 700 
 701 #if INCLUDE_JVMCI
 702     _jvmci_installed_code = installed_code;
 703     _speculation_log = speculation_log;
 704     oop obj = JNIHandles::resolve(installed_code);
 705     if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
 706       _jvmci_installed_code_triggers_invalidation = false;
 707     } else {
 708       _jvmci_installed_code_triggers_invalidation = true;
 709     }
 710 
 711     if (compiler->is_jvmci()) {
 712       // JVMCI might not produce any stub sections
 713       if (offsets->value(CodeOffsets::Exceptions) != -1) {
 714         _exception_offset        = code_offset()          + offsets->value(CodeOffsets::Exceptions);
 715       } else {
 716         _exception_offset = -1;
 717       }
 718       if (offsets->value(CodeOffsets::Deopt) != -1) {
 719         _deopt_handler_begin       = (address) this + code_offset()          + offsets->value(CodeOffsets::Deopt);
 720       } else {
 721         _deopt_handler_begin = NULL;
 722       }
 723       if (offsets->value(CodeOffsets::DeoptMH) != -1) {
 724         _deopt_mh_handler_begin  = (address) this + code_offset()          + offsets->value(CodeOffsets::DeoptMH);
 725       } else {
 726         _deopt_mh_handler_begin = NULL;
 727       }
 728     } else {
 729 #endif
 730     // Exception handler and deopt handler are in the stub section
 731     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
 732     assert(offsets->value(CodeOffsets::Deopt     ) != -1, "must be set");
 733 
 734     _exception_offset       = _stub_offset          + offsets->value(CodeOffsets::Exceptions);
 735     _deopt_handler_begin    = (address) this + _stub_offset          + offsets->value(CodeOffsets::Deopt);
 736     if (offsets->value(CodeOffsets::DeoptMH) != -1) {
 737       _deopt_mh_handler_begin  = (address) this + _stub_offset          + offsets->value(CodeOffsets::DeoptMH);
 738     } else {
 739       _deopt_mh_handler_begin  = NULL;
 740 #if INCLUDE_JVMCI
 741     }
 742 #endif
 743     }
 744     if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
 745       _unwind_handler_offset = code_offset()         + offsets->value(CodeOffsets::UnwindHandler);
 746     } else {
 747       _unwind_handler_offset = -1;
 748     }
 749 
 750     _oops_offset             = data_offset();
 751     _metadata_offset         = _oops_offset          + align_up(code_buffer->total_oop_size(), oopSize);
 752     int scopes_data_offset   = _metadata_offset      + align_up(code_buffer->total_metadata_size(), wordSize);
 753 
 754     _scopes_pcs_offset       = scopes_data_offset    + align_up(debug_info->data_size       (), oopSize);
 755     _dependencies_offset     = _scopes_pcs_offset    + adjust_pcs_size(debug_info->pcs_size());
 756     _handler_table_offset    = _dependencies_offset  + align_up((int)dependencies->size_in_bytes (), oopSize);
 757     _nul_chk_table_offset    = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
 758     _nmethod_end_offset      = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
 759     _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
 760     _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
 761     _osr_entry_point         = code_begin()          + offsets->value(CodeOffsets::OSR_Entry);
 762     _exception_cache         = NULL;
 763 
 764     _scopes_data_begin = (address) this + scopes_data_offset;
 765 
 766     _pc_desc_container.reset_to(scopes_pcs_begin());
 767 
 768     code_buffer->copy_code_and_locs_to(this);
 769     // Copy contents of ScopeDescRecorder to nmethod
 770     code_buffer->copy_values_to(this);
 771     debug_info->copy_to(this);
 772     dependencies->copy_to(this);
 773     clear_unloading_state();
 774     if (ScavengeRootsInCode) {
 775       Universe::heap()->register_nmethod(this);
 776     }
 777     debug_only(Universe::heap()->verify_nmethod(this));
 778 
 779     CodeCache::commit(this);
 780 
 781     // Copy contents of ExceptionHandlerTable to nmethod
 782     handler_table->copy_to(this);
 783     nul_chk_table->copy_to(this);
 784 
 785     // we use the information of entry points to find out if a method is
 786     // static or non static
 787     assert(compiler->is_c2() || compiler->is_jvmci() ||
 788            _method->is_static() == (entry_point() == _verified_entry_point),
 789            " entry points must be same for static methods and vice versa");
 790   }
 791 }
 792 
 793 // Print a short set of xml attributes to identify this nmethod.  The
 794 // output should be embedded in some other element.
 795 void nmethod::log_identity(xmlStream* log) const {
 796   log->print(" compile_id='%d'", compile_id());
 797   const char* nm_kind = compile_kind();
 798   if (nm_kind != NULL)  log->print(" compile_kind='%s'", nm_kind);
 799   log->print(" compiler='%s'", compiler_name());
 800   if (TieredCompilation) {
 801     log->print(" level='%d'", comp_level());
 802   }
 803 #if INCLUDE_JVMCI
 804     char buffer[O_BUFLEN];
 805     char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN);
 806     if (jvmci_name != NULL) {
 807       log->print(" jvmci_installed_code_name='");
 808       log->text("%s", jvmci_name);
 809       log->print("'");
 810     }
 811 #endif
 812 }
 813 
 814 
 815 #define LOG_OFFSET(log, name)                    \
 816   if (p2i(name##_end()) - p2i(name##_begin())) \
 817     log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'"    , \
 818                p2i(name##_begin()) - p2i(this))
 819 
 820 
 821 void nmethod::log_new_nmethod() const {
 822   if (LogCompilation && xtty != NULL) {
 823     ttyLocker ttyl;
 824     HandleMark hm;
 825     xtty->begin_elem("nmethod");
 826     log_identity(xtty);
 827     xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
 828     xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
 829 
 830     LOG_OFFSET(xtty, relocation);
 831     LOG_OFFSET(xtty, consts);
 832     LOG_OFFSET(xtty, insts);
 833     LOG_OFFSET(xtty, stub);
 834     LOG_OFFSET(xtty, scopes_data);
 835     LOG_OFFSET(xtty, scopes_pcs);
 836     LOG_OFFSET(xtty, dependencies);
 837     LOG_OFFSET(xtty, handler_table);
 838     LOG_OFFSET(xtty, nul_chk_table);
 839     LOG_OFFSET(xtty, oops);
 840     LOG_OFFSET(xtty, metadata);
 841 
 842     xtty->method(method());
 843     xtty->stamp();
 844     xtty->end_elem();
 845   }
 846 }
 847 
 848 #undef LOG_OFFSET
 849 
 850 
 851 // Print out more verbose output usually for a newly created nmethod.
 852 void nmethod::print_on(outputStream* st, const char* msg) const {
 853   if (st != NULL) {
 854     ttyLocker ttyl;
 855     if (WizardMode) {
 856       CompileTask::print(st, this, msg, /*short_form:*/ true);
 857       st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
 858     } else {
 859       CompileTask::print(st, this, msg, /*short_form:*/ false);
 860     }
 861   }
 862 }
 863 
 864 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
 865   bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
 866   if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
 867     print_nmethod(printnmethods);
 868   }
 869 }
 870 
 871 void nmethod::print_nmethod(bool printmethod) {
 872   ttyLocker ttyl;  // keep the following output all in one block
 873   if (xtty != NULL) {
 874     xtty->begin_head("print_nmethod");
 875     xtty->stamp();
 876     xtty->end_head();
 877   }
 878   // print the header part first
 879   print();
 880   // then print the requested information
 881   if (printmethod) {
 882     print_code();
 883     print_pcs();
 884     if (oop_maps()) {
 885       oop_maps()->print();
 886     }
 887   }
 888   if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
 889     print_scopes();
 890   }
 891   if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
 892     print_relocations();
 893   }
 894   if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
 895     print_dependencies();
 896   }
 897   if (printmethod || PrintExceptionHandlers) {
 898     print_handler_table();
 899     print_nul_chk_table();
 900   }
 901   if (printmethod) {
 902     print_recorded_oops();
 903     print_recorded_metadata();
 904   }
 905   if (xtty != NULL) {
 906     xtty->tail("print_nmethod");
 907   }
 908 }
 909 
 910 
 911 // Promote one word from an assembly-time handle to a live embedded oop.
 912 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
 913   if (handle == NULL ||
 914       // As a special case, IC oops are initialized to 1 or -1.
 915       handle == (jobject) Universe::non_oop_word()) {
 916     (*dest) = (oop) handle;
 917   } else {
 918     (*dest) = JNIHandles::resolve_non_null(handle);
 919   }
 920 }
 921 
 922 
 923 // Have to have the same name because it's called by a template
 924 void nmethod::copy_values(GrowableArray<jobject>* array) {
 925   int length = array->length();
 926   assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
 927   oop* dest = oops_begin();
 928   for (int index = 0 ; index < length; index++) {
 929     initialize_immediate_oop(&dest[index], array->at(index));
 930   }
 931 
 932   // Now we can fix up all the oops in the code.  We need to do this
 933   // in the code because the assembler uses jobjects as placeholders.
 934   // The code and relocations have already been initialized by the
 935   // CodeBlob constructor, so it is valid even at this early point to
 936   // iterate over relocations and patch the code.
 937   fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
 938 }
 939 
 940 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
 941   int length = array->length();
 942   assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
 943   Metadata** dest = metadata_begin();
 944   for (int index = 0 ; index < length; index++) {
 945     dest[index] = array->at(index);
 946   }
 947 }
 948 
 949 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
 950   // re-patch all oop-bearing instructions, just in case some oops moved
 951   RelocIterator iter(this, begin, end);
 952   while (iter.next()) {
 953     if (iter.type() == relocInfo::oop_type) {
 954       oop_Relocation* reloc = iter.oop_reloc();
 955       if (initialize_immediates && reloc->oop_is_immediate()) {
 956         oop* dest = reloc->oop_addr();
 957         initialize_immediate_oop(dest, (jobject) *dest);
 958       }
 959       // Refresh the oop-related bits of this instruction.
 960       reloc->fix_oop_relocation();
 961     } else if (iter.type() == relocInfo::metadata_type) {
 962       metadata_Relocation* reloc = iter.metadata_reloc();
 963       reloc->fix_metadata_relocation();
 964     }
 965   }
 966 }
 967 
 968 
 969 void nmethod::verify_clean_inline_caches() {
 970   assert(CompiledICLocker::is_safe(this), "mt unsafe call");
 971 
 972   ResourceMark rm;
 973   RelocIterator iter(this, oops_reloc_begin());
 974   while(iter.next()) {
 975     switch(iter.type()) {
 976       case relocInfo::virtual_call_type:
 977       case relocInfo::opt_virtual_call_type: {
 978         CompiledIC *ic = CompiledIC_at(&iter);
 979         // Ok, to lookup references to zombies here
 980         CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
 981         assert(cb != NULL, "destination not in CodeBlob?");
 982         nmethod* nm = cb->as_nmethod_or_null();
 983         if( nm != NULL ) {
 984           // Verify that inline caches pointing to both zombie and not_entrant methods are clean
 985           if (!nm->is_in_use() || (nm->method()->code() != nm)) {
 986             assert(ic->is_clean(), "IC should be clean");
 987           }
 988         }
 989         break;
 990       }
 991       case relocInfo::static_call_type: {
 992         CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
 993         CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
 994         assert(cb != NULL, "destination not in CodeBlob?");
 995         nmethod* nm = cb->as_nmethod_or_null();
 996         if( nm != NULL ) {
 997           // Verify that inline caches pointing to both zombie and not_entrant methods are clean
 998           if (!nm->is_in_use() || (nm->method()->code() != nm)) {
 999             assert(csc->is_clean(), "IC should be clean");
1000           }
1001         }
1002         break;
1003       }
1004       default:
1005         break;
1006     }
1007   }
1008 }
1009 
1010 // This is a private interface with the sweeper.
1011 void nmethod::mark_as_seen_on_stack() {
1012   assert(is_alive(), "Must be an alive method");
1013   // Set the traversal mark to ensure that the sweeper does 2
1014   // cleaning passes before moving to zombie.
1015   set_stack_traversal_mark(NMethodSweeper::traversal_count());
1016 }
1017 
1018 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1019 // there are no activations on the stack, not in use by the VM,
1020 // and not in use by the ServiceThread)
1021 bool nmethod::can_convert_to_zombie() {
1022   // Note that this is called when the sweeper has observed the nmethod to be
1023   // not_entrant. However, with concurrent code cache unloading, the state
1024   // might have moved on to unloaded if it is_unloading(), due to racing
1025   // concurrent GC threads.
1026   assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1027 
1028   // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1029   // count can be greater than the stack traversal count before it hits the
1030   // nmethod for the second time.
1031   // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1032   // convert it to zombie due to GC unloading interactions. However, if it
1033   // has become unloaded, then it is okay to convert such nmethods to zombie.
1034   return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1035          !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1036 }
1037 
1038 void nmethod::inc_decompile_count() {
1039   if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1040   // Could be gated by ProfileTraps, but do not bother...
1041   Method* m = method();
1042   if (m == NULL)  return;
1043   MethodData* mdo = m->method_data();
1044   if (mdo == NULL)  return;
1045   // There is a benign race here.  See comments in methodData.hpp.
1046   mdo->inc_decompile_count();
1047 }
1048 
1049 void nmethod::make_unloaded() {
1050   post_compiled_method_unload();
1051 
1052   // This nmethod is being unloaded, make sure that dependencies
1053   // recorded in instanceKlasses get flushed.
1054   // Since this work is being done during a GC, defer deleting dependencies from the
1055   // InstanceKlass.
1056   assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1057          "should only be called during gc");
1058   flush_dependencies(/*delete_immediately*/false);
1059 
1060   // Break cycle between nmethod & method
1061   LogTarget(Trace, class, unload, nmethod) lt;
1062   if (lt.is_enabled()) {
1063     LogStream ls(lt);
1064     ls.print("making nmethod " INTPTR_FORMAT
1065              " unloadable, Method*(" INTPTR_FORMAT
1066              ") ",
1067              p2i(this), p2i(_method));
1068      ls.cr();
1069   }
1070   // Unlink the osr method, so we do not look this up again
1071   if (is_osr_method()) {
1072     // Invalidate the osr nmethod only once
1073     if (is_in_use()) {
1074       invalidate_osr_method();
1075     }
1076 #ifdef ASSERT
1077     if (method() != NULL) {
1078       // Make sure osr nmethod is invalidated, i.e. not on the list
1079       bool found = method()->method_holder()->remove_osr_nmethod(this);
1080       assert(!found, "osr nmethod should have been invalidated");
1081     }
1082 #endif
1083   }
1084 
1085   // If _method is already NULL the Method* is about to be unloaded,
1086   // so we don't have to break the cycle. Note that it is possible to
1087   // have the Method* live here, in case we unload the nmethod because
1088   // it is pointing to some oop (other than the Method*) being unloaded.
1089   if (_method != NULL) {
1090     // OSR methods point to the Method*, but the Method* does not
1091     // point back!
1092     if (_method->code() == this) {
1093       _method->clear_code(); // Break a cycle
1094     }
1095     _method = NULL;            // Clear the method of this dead nmethod
1096   }
1097 
1098   // Make the class unloaded - i.e., change state and notify sweeper
1099   assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1100          "must be at safepoint");
1101 
1102   {
1103     // Clear ICStubs and release any CompiledICHolders.
1104     CompiledICLocker ml(this);
1105     clear_ic_callsites();
1106   }
1107 
1108   // Unregister must be done before the state change
1109   {
1110     MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1111                      Mutex::_no_safepoint_check_flag);
1112     Universe::heap()->unregister_nmethod(this);
1113   }
1114 
1115   // Log the unloading.
1116   log_state_change();
1117 
1118 #if INCLUDE_JVMCI
1119   // The method can only be unloaded after the pointer to the installed code
1120   // Java wrapper is no longer alive. Here we need to clear out this weak
1121   // reference to the dead object.
1122   maybe_invalidate_installed_code();
1123 #endif
1124 
1125   // The Method* is gone at this point
1126   assert(_method == NULL, "Tautology");
1127 
1128   set_osr_link(NULL);
1129   NMethodSweeper::report_state_change(this);
1130 
1131   // The release is only needed for compile-time ordering, as accesses
1132   // into the nmethod after the store are not safe due to the sweeper
1133   // being allowed to free it when the store is observed, during
1134   // concurrent nmethod unloading. Therefore, there is no need for
1135   // acquire on the loader side.
1136   OrderAccess::release_store(&_state, (signed char)unloaded);
1137 }
1138 
1139 void nmethod::invalidate_osr_method() {
1140   assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1141   // Remove from list of active nmethods
1142   if (method() != NULL) {
1143     method()->method_holder()->remove_osr_nmethod(this);
1144   }
1145 }
1146 
1147 void nmethod::log_state_change() const {
1148   if (LogCompilation) {
1149     if (xtty != NULL) {
1150       ttyLocker ttyl;  // keep the following output all in one block
1151       if (_state == unloaded) {
1152         xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1153                          os::current_thread_id());
1154       } else {
1155         xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1156                          os::current_thread_id(),
1157                          (_state == zombie ? " zombie='1'" : ""));
1158       }
1159       log_identity(xtty);
1160       xtty->stamp();
1161       xtty->end_elem();
1162     }
1163   }
1164 
1165   const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1166   CompileTask::print_ul(this, state_msg);
1167   if (PrintCompilation && _state != unloaded) {
1168     print_on(tty, state_msg);
1169   }
1170 }
1171 
1172 void nmethod::unlink_from_method(bool acquire_lock) {
1173   // We need to check if both the _code and _from_compiled_code_entry_point
1174   // refer to this nmethod because there is a race in setting these two fields
1175   // in Method* as seen in bugid 4947125.
1176   // If the vep() points to the zombie nmethod, the memory for the nmethod
1177   // could be flushed and the compiler and vtable stubs could still call
1178   // through it.
1179   if (method() != NULL && (method()->code() == this ||
1180                            method()->from_compiled_entry() == verified_entry_point())) {
1181     method()->clear_code(acquire_lock);
1182   }
1183 }
1184 
1185 /**
1186  * Common functionality for both make_not_entrant and make_zombie
1187  */
1188 bool nmethod::make_not_entrant_or_zombie(int state) {
1189   assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1190   assert(!is_zombie(), "should not already be a zombie");
1191 
1192   if (_state == state) {
1193     // Avoid taking the lock if already in required state.
1194     // This is safe from races because the state is an end-state,
1195     // which the nmethod cannot back out of once entered.
1196     // No need for fencing either.
1197     return false;
1198   }
1199 
1200   // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1201   nmethodLocker nml(this);
1202   methodHandle the_method(method());
1203   // This can be called while the system is already at a safepoint which is ok
1204   NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1205 
1206   // during patching, depending on the nmethod state we must notify the GC that
1207   // code has been unloaded, unregistering it. We cannot do this right while
1208   // holding the Patching_lock because we need to use the CodeCache_lock. This
1209   // would be prone to deadlocks.
1210   // This flag is used to remember whether we need to later lock and unregister.
1211   bool nmethod_needs_unregister = false;
1212 
1213   {
1214     // invalidate osr nmethod before acquiring the patching lock since
1215     // they both acquire leaf locks and we don't want a deadlock.
1216     // This logic is equivalent to the logic below for patching the
1217     // verified entry point of regular methods. We check that the
1218     // nmethod is in use to ensure that it is invalidated only once.
1219     if (is_osr_method() && is_in_use()) {
1220       // this effectively makes the osr nmethod not entrant
1221       invalidate_osr_method();
1222     }
1223 
1224     // Enter critical section.  Does not block for safepoint.
1225     MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1226 
1227     if (_state == state) {
1228       // another thread already performed this transition so nothing
1229       // to do, but return false to indicate this.
1230       return false;
1231     }
1232 
1233     // The caller can be calling the method statically or through an inline
1234     // cache call.
1235     if (!is_osr_method() && !is_not_entrant()) {
1236       NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1237                   SharedRuntime::get_handle_wrong_method_stub());
1238     }
1239 
1240     if (is_in_use() && update_recompile_counts()) {
1241       // It's a true state change, so mark the method as decompiled.
1242       // Do it only for transition from alive.
1243       inc_decompile_count();
1244     }
1245 
1246     // If the state is becoming a zombie, signal to unregister the nmethod with
1247     // the heap.
1248     // This nmethod may have already been unloaded during a full GC.
1249     if ((state == zombie) && !is_unloaded()) {
1250       nmethod_needs_unregister = true;
1251     }
1252 
1253     // Must happen before state change. Otherwise we have a race condition in
1254     // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1255     // transition its state from 'not_entrant' to 'zombie' without having to wait
1256     // for stack scanning.
1257     if (state == not_entrant) {
1258       mark_as_seen_on_stack();
1259       OrderAccess::storestore(); // _stack_traversal_mark and _state
1260     }
1261 
1262     // Change state
1263     _state = state;
1264 
1265     // Log the transition once
1266     log_state_change();
1267 
1268     // Invalidate while holding the patching lock
1269     JVMCI_ONLY(maybe_invalidate_installed_code());
1270 
1271     // Remove nmethod from method.
1272     unlink_from_method(false /* already owns Patching_lock */);
1273   } // leave critical region under Patching_lock
1274 
1275 #ifdef ASSERT
1276   if (is_osr_method() && method() != NULL) {
1277     // Make sure osr nmethod is invalidated, i.e. not on the list
1278     bool found = method()->method_holder()->remove_osr_nmethod(this);
1279     assert(!found, "osr nmethod should have been invalidated");
1280   }
1281 #endif
1282 
1283   // When the nmethod becomes zombie it is no longer alive so the
1284   // dependencies must be flushed.  nmethods in the not_entrant
1285   // state will be flushed later when the transition to zombie
1286   // happens or they get unloaded.
1287   if (state == zombie) {
1288     {
1289       // Flushing dependencies must be done before any possible
1290       // safepoint can sneak in, otherwise the oops used by the
1291       // dependency logic could have become stale.
1292       MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1293       if (nmethod_needs_unregister) {
1294         Universe::heap()->unregister_nmethod(this);
1295       }
1296       flush_dependencies(/*delete_immediately*/true);
1297     }
1298 
1299     // Clear ICStubs to prevent back patching stubs of zombie or flushed
1300     // nmethods during the next safepoint (see ICStub::finalize), as well
1301     // as to free up CompiledICHolder resources.
1302     {
1303       CompiledICLocker ml(this);
1304       clear_ic_callsites();
1305     }
1306 
1307     // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1308     // event and it hasn't already been reported for this nmethod then
1309     // report it now. The event may have been reported earlier if the GC
1310     // marked it for unloading). JvmtiDeferredEventQueue support means
1311     // we no longer go to a safepoint here.
1312     post_compiled_method_unload();
1313 
1314 #ifdef ASSERT
1315     // It's no longer safe to access the oops section since zombie
1316     // nmethods aren't scanned for GC.
1317     _oops_are_stale = true;
1318 #endif
1319      // the Method may be reclaimed by class unloading now that the
1320      // nmethod is in zombie state
1321     set_method(NULL);
1322   } else {
1323     assert(state == not_entrant, "other cases may need to be handled differently");
1324   }
1325 
1326   if (TraceCreateZombies) {
1327     ResourceMark m;
1328     tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1329   }
1330 
1331   NMethodSweeper::report_state_change(this);
1332   return true;
1333 }
1334 
1335 void nmethod::flush() {
1336   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1337   // Note that there are no valid oops in the nmethod anymore.
1338   assert(!is_osr_method() || is_unloaded() || is_zombie(),
1339          "osr nmethod must be unloaded or zombie before flushing");
1340   assert(is_zombie() || is_osr_method(), "must be a zombie method");
1341   assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1342   assert_locked_or_safepoint(CodeCache_lock);
1343 
1344   // completely deallocate this method
1345   Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1346   if (PrintMethodFlushing) {
1347     tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1348                   "/Free CodeCache:" SIZE_FORMAT "Kb",
1349                   is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1350                   CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1351   }
1352 
1353   // We need to deallocate any ExceptionCache data.
1354   // Note that we do not need to grab the nmethod lock for this, it
1355   // better be thread safe if we're disposing of it!
1356   ExceptionCache* ec = exception_cache();
1357   set_exception_cache(NULL);
1358   while(ec != NULL) {
1359     ExceptionCache* next = ec->next();
1360     delete ec;
1361     ec = next;
1362   }
1363 
1364   if (on_scavenge_root_list()) {
1365     CodeCache::drop_scavenge_root_nmethod(this);
1366   }
1367 
1368 #if INCLUDE_JVMCI
1369   if (_jvmci_installed_code != NULL) {
1370     JNIHandles::destroy_weak_global(_jvmci_installed_code);
1371     _jvmci_installed_code = NULL;
1372   }
1373 
1374   if (_speculation_log != NULL) {
1375     JNIHandles::destroy_weak_global(_speculation_log);
1376     _speculation_log = NULL;
1377   }
1378 #endif
1379 
1380   CodeBlob::flush();
1381   CodeCache::free(this);
1382 }
1383 
1384 oop nmethod::oop_at(int index) const {
1385   if (index == 0) {
1386     return NULL;
1387   }
1388   return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1389 }
1390 
1391 //
1392 // Notify all classes this nmethod is dependent on that it is no
1393 // longer dependent. This should only be called in two situations.
1394 // First, when a nmethod transitions to a zombie all dependents need
1395 // to be clear.  Since zombification happens at a safepoint there's no
1396 // synchronization issues.  The second place is a little more tricky.
1397 // During phase 1 of mark sweep class unloading may happen and as a
1398 // result some nmethods may get unloaded.  In this case the flushing
1399 // of dependencies must happen during phase 1 since after GC any
1400 // dependencies in the unloaded nmethod won't be updated, so
1401 // traversing the dependency information in unsafe.  In that case this
1402 // function is called with a boolean argument and this function only
1403 // notifies instanceKlasses that are reachable
1404 
1405 void nmethod::flush_dependencies(bool delete_immediately) {
1406   DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1407   assert(called_by_gc != delete_immediately,
1408   "delete_immediately is false if and only if we are called during GC");
1409   if (!has_flushed_dependencies()) {
1410     set_has_flushed_dependencies();
1411     for (Dependencies::DepStream deps(this); deps.next(); ) {
1412       if (deps.type() == Dependencies::call_site_target_value) {
1413         // CallSite dependencies are managed on per-CallSite instance basis.
1414         oop call_site = deps.argument_oop(0);
1415         if (delete_immediately) {
1416           assert_locked_or_safepoint(CodeCache_lock);
1417           MethodHandles::remove_dependent_nmethod(call_site, this);
1418         } else {
1419           MethodHandles::clean_dependency_context(call_site);
1420         }
1421       } else {
1422         Klass* klass = deps.context_type();
1423         if (klass == NULL) {
1424           continue;  // ignore things like evol_method
1425         }
1426         // During GC delete_immediately is false, and liveness
1427         // of dependee determines class that needs to be updated.
1428         if (delete_immediately) {
1429           assert_locked_or_safepoint(CodeCache_lock);
1430           InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1431         } else if (klass->is_loader_alive()) {
1432           // The GC may clean dependency contexts concurrently and in parallel.
1433           InstanceKlass::cast(klass)->clean_dependency_context();
1434         }
1435       }
1436     }
1437   }
1438 }
1439 
1440 // ------------------------------------------------------------------
1441 // post_compiled_method_load_event
1442 // new method for install_code() path
1443 // Transfer information from compilation to jvmti
1444 void nmethod::post_compiled_method_load_event() {
1445 
1446   Method* moop = method();
1447   HOTSPOT_COMPILED_METHOD_LOAD(
1448       (char *) moop->klass_name()->bytes(),
1449       moop->klass_name()->utf8_length(),
1450       (char *) moop->name()->bytes(),
1451       moop->name()->utf8_length(),
1452       (char *) moop->signature()->bytes(),
1453       moop->signature()->utf8_length(),
1454       insts_begin(), insts_size());
1455 
1456   if (JvmtiExport::should_post_compiled_method_load() ||
1457       JvmtiExport::should_post_compiled_method_unload()) {
1458     get_and_cache_jmethod_id();
1459   }
1460 
1461   if (JvmtiExport::should_post_compiled_method_load()) {
1462     // Let the Service thread (which is a real Java thread) post the event
1463     MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1464     JvmtiDeferredEventQueue::enqueue(
1465       JvmtiDeferredEvent::compiled_method_load_event(this));
1466   }
1467 }
1468 
1469 jmethodID nmethod::get_and_cache_jmethod_id() {
1470   if (_jmethod_id == NULL) {
1471     // Cache the jmethod_id since it can no longer be looked up once the
1472     // method itself has been marked for unloading.
1473     _jmethod_id = method()->jmethod_id();
1474   }
1475   return _jmethod_id;
1476 }
1477 
1478 void nmethod::post_compiled_method_unload() {
1479   if (unload_reported()) {
1480     // During unloading we transition to unloaded and then to zombie
1481     // and the unloading is reported during the first transition.
1482     return;
1483   }
1484 
1485   assert(_method != NULL && !is_unloaded(), "just checking");
1486   DTRACE_METHOD_UNLOAD_PROBE(method());
1487 
1488   // If a JVMTI agent has enabled the CompiledMethodUnload event then
1489   // post the event. Sometime later this nmethod will be made a zombie
1490   // by the sweeper but the Method* will not be valid at that point.
1491   // If the _jmethod_id is null then no load event was ever requested
1492   // so don't bother posting the unload.  The main reason for this is
1493   // that the jmethodID is a weak reference to the Method* so if
1494   // it's being unloaded there's no way to look it up since the weak
1495   // ref will have been cleared.
1496   if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1497     assert(!unload_reported(), "already unloaded");
1498     JvmtiDeferredEvent event =
1499       JvmtiDeferredEvent::compiled_method_unload_event(this,
1500           _jmethod_id, insts_begin());
1501     MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1502     JvmtiDeferredEventQueue::enqueue(event);
1503   }
1504 
1505   // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1506   // any time. As the nmethod is being unloaded now we mark it has
1507   // having the unload event reported - this will ensure that we don't
1508   // attempt to report the event in the unlikely scenario where the
1509   // event is enabled at the time the nmethod is made a zombie.
1510   set_unload_reported();
1511 }
1512 
1513 // Iterate over metadata calling this function.   Used by RedefineClasses
1514 void nmethod::metadata_do(void f(Metadata*)) {
1515   {
1516     // Visit all immediate references that are embedded in the instruction stream.
1517     RelocIterator iter(this, oops_reloc_begin());
1518     while (iter.next()) {
1519       if (iter.type() == relocInfo::metadata_type ) {
1520         metadata_Relocation* r = iter.metadata_reloc();
1521         // In this metadata, we must only follow those metadatas directly embedded in
1522         // the code.  Other metadatas (oop_index>0) are seen as part of
1523         // the metadata section below.
1524         assert(1 == (r->metadata_is_immediate()) +
1525                (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1526                "metadata must be found in exactly one place");
1527         if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1528           Metadata* md = r->metadata_value();
1529           if (md != _method) f(md);
1530         }
1531       } else if (iter.type() == relocInfo::virtual_call_type) {
1532         // Check compiledIC holders associated with this nmethod
1533         ResourceMark rm;
1534         CompiledIC *ic = CompiledIC_at(&iter);
1535         if (ic->is_icholder_call()) {
1536           CompiledICHolder* cichk = ic->cached_icholder();
1537           f(cichk->holder_metadata());
1538           f(cichk->holder_klass());
1539         } else {
1540           Metadata* ic_oop = ic->cached_metadata();
1541           if (ic_oop != NULL) {
1542             f(ic_oop);
1543           }
1544         }
1545       }
1546     }
1547   }
1548 
1549   // Visit the metadata section
1550   for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1551     if (*p == Universe::non_oop_word() || *p == NULL)  continue;  // skip non-oops
1552     Metadata* md = *p;
1553     f(md);
1554   }
1555 
1556   // Visit metadata not embedded in the other places.
1557   if (_method != NULL) f(_method);
1558 }
1559 
1560 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1561 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1562 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1563 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1564 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1565 
1566 class IsUnloadingState: public AllStatic {
1567   static const uint8_t _is_unloading_mask = 1;
1568   static const uint8_t _is_unloading_shift = 0;
1569   static const uint8_t _unloading_cycle_mask = 6;
1570   static const uint8_t _unloading_cycle_shift = 1;
1571 
1572   static uint8_t set_is_unloading(uint8_t state, bool value) {
1573     state &= ~_is_unloading_mask;
1574     if (value) {
1575       state |= 1 << _is_unloading_shift;
1576     }
1577     assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1578     return state;
1579   }
1580 
1581   static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1582     state &= ~_unloading_cycle_mask;
1583     state |= value << _unloading_cycle_shift;
1584     assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1585     return state;
1586   }
1587 
1588 public:
1589   static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1590   static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1591 
1592   static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1593     uint8_t state = 0;
1594     state = set_is_unloading(state, is_unloading);
1595     state = set_unloading_cycle(state, unloading_cycle);
1596     return state;
1597   }
1598 };
1599 
1600 bool nmethod::is_unloading() {
1601   uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1602   bool state_is_unloading = IsUnloadingState::is_unloading(state);
1603   uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1604   if (state_is_unloading) {
1605     return true;
1606   }
1607   uint8_t current_cycle = CodeCache::unloading_cycle();
1608   if (state_unloading_cycle == current_cycle) {
1609     return false;
1610   }
1611 
1612   // The IsUnloadingBehaviour is responsible for checking if there are any dead
1613   // oops in the CompiledMethod, by calling oops_do on it.
1614   state_unloading_cycle = current_cycle;
1615 
1616   if (is_zombie()) {
1617     // Zombies without calculated unloading epoch are never unloading due to GC.
1618 
1619     // There are no races where a previously observed is_unloading() nmethod
1620     // suddenly becomes not is_unloading() due to here being observed as zombie.
1621 
1622     // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1623     // and unloaded in the safepoint. That makes races where an nmethod is first
1624     // observed as is_alive() && is_unloading() and subsequently observed as
1625     // is_zombie() impossible.
1626 
1627     // With concurrent unloading, all references to is_unloading() nmethods are
1628     // first unlinked (e.g. IC caches and dependency contexts). Then a global
1629     // handshake operation is performed with all JavaThreads before finally
1630     // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1631     // nmethods to zombies; it waits for them to become is_unloaded(). So before
1632     // the global handshake, it is impossible for is_unloading() nmethods to
1633     // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1634     // nmethods before taking that global handshake, meaning that it will never
1635     // be recalculated after the handshake.
1636 
1637     // After that global handshake, is_unloading() nmethods are only observable
1638     // to the iterators, and they will never trigger recomputation of the cached
1639     // is_unloading_state, and hence may not suffer from such races.
1640 
1641     state_is_unloading = false;
1642   } else {
1643     state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1644   }
1645 
1646   state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1647 
1648   RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1649 
1650   return state_is_unloading;
1651 }
1652 
1653 void nmethod::clear_unloading_state() {
1654   uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1655   RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1656 }
1657 
1658 
1659 // This is called at the end of the strong tracing/marking phase of a
1660 // GC to unload an nmethod if it contains otherwise unreachable
1661 // oops.
1662 
1663 void nmethod::do_unloading(bool unloading_occurred) {
1664   // Make sure the oop's ready to receive visitors
1665   assert(!is_zombie() && !is_unloaded(),
1666          "should not call follow on zombie or unloaded nmethod");
1667 
1668   if (is_unloading()) {
1669     make_unloaded();
1670   } else {
1671 #if INCLUDE_JVMCI
1672     if (_jvmci_installed_code != NULL &&
1673         JNIHandles::is_global_weak_cleared(_jvmci_installed_code) &&
1674         _jvmci_installed_code_triggers_invalidation) {
1675       make_not_entrant();
1676     }
1677 #endif
1678 
1679     guarantee(unload_nmethod_caches(unloading_occurred),
1680               "Should not need transition stubs");
1681   }
1682 }
1683 
1684 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1685   // make sure the oops ready to receive visitors
1686   assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1687   assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1688 
1689   // Prevent extra code cache walk for platforms that don't have immediate oops.
1690   if (relocInfo::mustIterateImmediateOopsInCode()) {
1691     RelocIterator iter(this, oops_reloc_begin());
1692 
1693     while (iter.next()) {
1694       if (iter.type() == relocInfo::oop_type ) {
1695         oop_Relocation* r = iter.oop_reloc();
1696         // In this loop, we must only follow those oops directly embedded in
1697         // the code.  Other oops (oop_index>0) are seen as part of scopes_oops.
1698         assert(1 == (r->oop_is_immediate()) +
1699                (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1700                "oop must be found in exactly one place");
1701         if (r->oop_is_immediate() && r->oop_value() != NULL) {
1702           f->do_oop(r->oop_addr());
1703         }
1704       }
1705     }
1706   }
1707 
1708   // Scopes
1709   // This includes oop constants not inlined in the code stream.
1710   for (oop* p = oops_begin(); p < oops_end(); p++) {
1711     if (*p == Universe::non_oop_word())  continue;  // skip non-oops
1712     f->do_oop(p);
1713   }
1714 }
1715 
1716 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1717 
1718 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1719 
1720 // An nmethod is "marked" if its _mark_link is set non-null.
1721 // Even if it is the end of the linked list, it will have a non-null link value,
1722 // as long as it is on the list.
1723 // This code must be MP safe, because it is used from parallel GC passes.
1724 bool nmethod::test_set_oops_do_mark() {
1725   assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1726   if (_oops_do_mark_link == NULL) {
1727     // Claim this nmethod for this thread to mark.
1728     if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1729       // Atomically append this nmethod (now claimed) to the head of the list:
1730       nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1731       for (;;) {
1732         nmethod* required_mark_nmethods = observed_mark_nmethods;
1733         _oops_do_mark_link = required_mark_nmethods;
1734         observed_mark_nmethods =
1735           Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1736         if (observed_mark_nmethods == required_mark_nmethods)
1737           break;
1738       }
1739       // Mark was clear when we first saw this guy.
1740       LogTarget(Trace, gc, nmethod) lt;
1741       if (lt.is_enabled()) {
1742         LogStream ls(lt);
1743         CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1744       }
1745       return false;
1746     }
1747   }
1748   // On fall through, another racing thread marked this nmethod before we did.
1749   return true;
1750 }
1751 
1752 void nmethod::oops_do_marking_prologue() {
1753   log_trace(gc, nmethod)("oops_do_marking_prologue");
1754   assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1755   // We use cmpxchg instead of regular assignment here because the user
1756   // may fork a bunch of threads, and we need them all to see the same state.
1757   nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1758   guarantee(observed == NULL, "no races in this sequential code");
1759 }
1760 
1761 void nmethod::oops_do_marking_epilogue() {
1762   assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1763   nmethod* cur = _oops_do_mark_nmethods;
1764   while (cur != NMETHOD_SENTINEL) {
1765     assert(cur != NULL, "not NULL-terminated");
1766     nmethod* next = cur->_oops_do_mark_link;
1767     cur->_oops_do_mark_link = NULL;
1768     DEBUG_ONLY(cur->verify_oop_relocations());
1769 
1770     LogTarget(Trace, gc, nmethod) lt;
1771     if (lt.is_enabled()) {
1772       LogStream ls(lt);
1773       CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1774     }
1775     cur = next;
1776   }
1777   nmethod* required = _oops_do_mark_nmethods;
1778   nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1779   guarantee(observed == required, "no races in this sequential code");
1780   log_trace(gc, nmethod)("oops_do_marking_epilogue");
1781 }
1782 
1783 class DetectScavengeRoot: public OopClosure {
1784   bool     _detected_scavenge_root;
1785   nmethod* _print_nm;
1786 public:
1787   DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1788 
1789   bool detected_scavenge_root() { return _detected_scavenge_root; }
1790   virtual void do_oop(oop* p) {
1791     if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1792       NOT_PRODUCT(maybe_print(p));
1793       _detected_scavenge_root = true;
1794     }
1795   }
1796   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1797 
1798 #ifndef PRODUCT
1799   void maybe_print(oop* p) {
1800     LogTarget(Trace, gc, nmethod) lt;
1801     if (lt.is_enabled()) {
1802       LogStream ls(lt);
1803       if (!_detected_scavenge_root) {
1804         CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1805       }
1806       ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1807                p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1808                p2i(*p), p2i(p));
1809       ls.cr();
1810     }
1811   }
1812 #endif //PRODUCT
1813 };
1814 
1815 bool nmethod::detect_scavenge_root_oops() {
1816   DetectScavengeRoot detect_scavenge_root(this);
1817   oops_do(&detect_scavenge_root);
1818   return detect_scavenge_root.detected_scavenge_root();
1819 }
1820 
1821 inline bool includes(void* p, void* from, void* to) {
1822   return from <= p && p < to;
1823 }
1824 
1825 
1826 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1827   assert(count >= 2, "must be sentinel values, at least");
1828 
1829 #ifdef ASSERT
1830   // must be sorted and unique; we do a binary search in find_pc_desc()
1831   int prev_offset = pcs[0].pc_offset();
1832   assert(prev_offset == PcDesc::lower_offset_limit,
1833          "must start with a sentinel");
1834   for (int i = 1; i < count; i++) {
1835     int this_offset = pcs[i].pc_offset();
1836     assert(this_offset > prev_offset, "offsets must be sorted");
1837     prev_offset = this_offset;
1838   }
1839   assert(prev_offset == PcDesc::upper_offset_limit,
1840          "must end with a sentinel");
1841 #endif //ASSERT
1842 
1843   // Search for MethodHandle invokes and tag the nmethod.
1844   for (int i = 0; i < count; i++) {
1845     if (pcs[i].is_method_handle_invoke()) {
1846       set_has_method_handle_invokes(true);
1847       break;
1848     }
1849   }
1850   assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1851 
1852   int size = count * sizeof(PcDesc);
1853   assert(scopes_pcs_size() >= size, "oob");
1854   memcpy(scopes_pcs_begin(), pcs, size);
1855 
1856   // Adjust the final sentinel downward.
1857   PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1858   assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1859   last_pc->set_pc_offset(content_size() + 1);
1860   for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1861     // Fill any rounding gaps with copies of the last record.
1862     last_pc[1] = last_pc[0];
1863   }
1864   // The following assert could fail if sizeof(PcDesc) is not
1865   // an integral multiple of oopSize (the rounding term).
1866   // If it fails, change the logic to always allocate a multiple
1867   // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1868   assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1869 }
1870 
1871 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1872   assert(scopes_data_size() >= size, "oob");
1873   memcpy(scopes_data_begin(), buffer, size);
1874 }
1875 
1876 #ifdef ASSERT
1877 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1878   PcDesc* lower = search.scopes_pcs_begin();
1879   PcDesc* upper = search.scopes_pcs_end();
1880   lower += 1; // exclude initial sentinel
1881   PcDesc* res = NULL;
1882   for (PcDesc* p = lower; p < upper; p++) {
1883     NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests);  // don't count this call to match_desc
1884     if (match_desc(p, pc_offset, approximate)) {
1885       if (res == NULL)
1886         res = p;
1887       else
1888         res = (PcDesc*) badAddress;
1889     }
1890   }
1891   return res;
1892 }
1893 #endif
1894 
1895 
1896 // Finds a PcDesc with real-pc equal to "pc"
1897 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1898   address base_address = search.code_begin();
1899   if ((pc < base_address) ||
1900       (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1901     return NULL;  // PC is wildly out of range
1902   }
1903   int pc_offset = (int) (pc - base_address);
1904 
1905   // Check the PcDesc cache if it contains the desired PcDesc
1906   // (This as an almost 100% hit rate.)
1907   PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1908   if (res != NULL) {
1909     assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1910     return res;
1911   }
1912 
1913   // Fallback algorithm: quasi-linear search for the PcDesc
1914   // Find the last pc_offset less than the given offset.
1915   // The successor must be the required match, if there is a match at all.
1916   // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1917   PcDesc* lower = search.scopes_pcs_begin();
1918   PcDesc* upper = search.scopes_pcs_end();
1919   upper -= 1; // exclude final sentinel
1920   if (lower >= upper)  return NULL;  // native method; no PcDescs at all
1921 
1922 #define assert_LU_OK \
1923   /* invariant on lower..upper during the following search: */ \
1924   assert(lower->pc_offset() <  pc_offset, "sanity"); \
1925   assert(upper->pc_offset() >= pc_offset, "sanity")
1926   assert_LU_OK;
1927 
1928   // Use the last successful return as a split point.
1929   PcDesc* mid = _pc_desc_cache.last_pc_desc();
1930   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1931   if (mid->pc_offset() < pc_offset) {
1932     lower = mid;
1933   } else {
1934     upper = mid;
1935   }
1936 
1937   // Take giant steps at first (4096, then 256, then 16, then 1)
1938   const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1939   const int RADIX = (1 << LOG2_RADIX);
1940   for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1941     while ((mid = lower + step) < upper) {
1942       assert_LU_OK;
1943       NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1944       if (mid->pc_offset() < pc_offset) {
1945         lower = mid;
1946       } else {
1947         upper = mid;
1948         break;
1949       }
1950     }
1951     assert_LU_OK;
1952   }
1953 
1954   // Sneak up on the value with a linear search of length ~16.
1955   while (true) {
1956     assert_LU_OK;
1957     mid = lower + 1;
1958     NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1959     if (mid->pc_offset() < pc_offset) {
1960       lower = mid;
1961     } else {
1962       upper = mid;
1963       break;
1964     }
1965   }
1966 #undef assert_LU_OK
1967 
1968   if (match_desc(upper, pc_offset, approximate)) {
1969     assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1970     _pc_desc_cache.add_pc_desc(upper);
1971     return upper;
1972   } else {
1973     assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1974     return NULL;
1975   }
1976 }
1977 
1978 
1979 void nmethod::check_all_dependencies(DepChange& changes) {
1980   // Checked dependencies are allocated into this ResourceMark
1981   ResourceMark rm;
1982 
1983   // Turn off dependency tracing while actually testing dependencies.
1984   NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1985 
1986   typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1987                             &DependencySignature::equals, 11027> DepTable;
1988 
1989   DepTable* table = new DepTable();
1990 
1991   // Iterate over live nmethods and check dependencies of all nmethods that are not
1992   // marked for deoptimization. A particular dependency is only checked once.
1993   NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1994   while(iter.next()) {
1995     nmethod* nm = iter.method();
1996     // Only notify for live nmethods
1997     if (!nm->is_marked_for_deoptimization()) {
1998       for (Dependencies::DepStream deps(nm); deps.next(); ) {
1999         // Construct abstraction of a dependency.
2000         DependencySignature* current_sig = new DependencySignature(deps);
2001 
2002         // Determine if dependency is already checked. table->put(...) returns
2003         // 'true' if the dependency is added (i.e., was not in the hashtable).
2004         if (table->put(*current_sig, 1)) {
2005           if (deps.check_dependency() != NULL) {
2006             // Dependency checking failed. Print out information about the failed
2007             // dependency and finally fail with an assert. We can fail here, since
2008             // dependency checking is never done in a product build.
2009             tty->print_cr("Failed dependency:");
2010             changes.print();
2011             nm->print();
2012             nm->print_dependencies();
2013             assert(false, "Should have been marked for deoptimization");
2014           }
2015         }
2016       }
2017     }
2018   }
2019 }
2020 
2021 bool nmethod::check_dependency_on(DepChange& changes) {
2022   // What has happened:
2023   // 1) a new class dependee has been added
2024   // 2) dependee and all its super classes have been marked
2025   bool found_check = false;  // set true if we are upset
2026   for (Dependencies::DepStream deps(this); deps.next(); ) {
2027     // Evaluate only relevant dependencies.
2028     if (deps.spot_check_dependency_at(changes) != NULL) {
2029       found_check = true;
2030       NOT_DEBUG(break);
2031     }
2032   }
2033   return found_check;
2034 }
2035 
2036 bool nmethod::is_evol_dependent() {
2037   for (Dependencies::DepStream deps(this); deps.next(); ) {
2038     if (deps.type() == Dependencies::evol_method) {
2039       Method* method = deps.method_argument(0);
2040       if (method->is_old()) {
2041         if (log_is_enabled(Debug, redefine, class, nmethod)) {
2042           ResourceMark rm;
2043           log_debug(redefine, class, nmethod)
2044             ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2045              _method->method_holder()->external_name(),
2046              _method->name()->as_C_string(),
2047              _method->signature()->as_C_string(),
2048              compile_id(),
2049              method->method_holder()->external_name(),
2050              method->name()->as_C_string(),
2051              method->signature()->as_C_string());
2052         }
2053         if (TraceDependencies || LogCompilation)
2054           deps.log_dependency(method->method_holder());
2055         return true;
2056       }
2057     }
2058   }
2059   return false;
2060 }
2061 
2062 // Called from mark_for_deoptimization, when dependee is invalidated.
2063 bool nmethod::is_dependent_on_method(Method* dependee) {
2064   for (Dependencies::DepStream deps(this); deps.next(); ) {
2065     if (deps.type() != Dependencies::evol_method)
2066       continue;
2067     Method* method = deps.method_argument(0);
2068     if (method == dependee) return true;
2069   }
2070   return false;
2071 }
2072 
2073 
2074 bool nmethod::is_patchable_at(address instr_addr) {
2075   assert(insts_contains(instr_addr), "wrong nmethod used");
2076   if (is_zombie()) {
2077     // a zombie may never be patched
2078     return false;
2079   }
2080   return true;
2081 }
2082 
2083 
2084 address nmethod::continuation_for_implicit_exception(address pc) {
2085   // Exception happened outside inline-cache check code => we are inside
2086   // an active nmethod => use cpc to determine a return address
2087   int exception_offset = pc - code_begin();
2088   int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2089 #ifdef ASSERT
2090   if (cont_offset == 0) {
2091     Thread* thread = Thread::current();
2092     ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2093     HandleMark hm(thread);
2094     ResourceMark rm(thread);
2095     CodeBlob* cb = CodeCache::find_blob(pc);
2096     assert(cb != NULL && cb == this, "");
2097     ttyLocker ttyl;
2098     tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2099     print();
2100     method()->print_codes();
2101     print_code();
2102     print_pcs();
2103   }
2104 #endif
2105   if (cont_offset == 0) {
2106     // Let the normal error handling report the exception
2107     return NULL;
2108   }
2109   return code_begin() + cont_offset;
2110 }
2111 
2112 
2113 
2114 void nmethod_init() {
2115   // make sure you didn't forget to adjust the filler fields
2116   assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2117 }
2118 
2119 
2120 //-------------------------------------------------------------------------------------------
2121 
2122 
2123 // QQQ might we make this work from a frame??
2124 nmethodLocker::nmethodLocker(address pc) {
2125   CodeBlob* cb = CodeCache::find_blob(pc);
2126   guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2127   _nm = cb->as_compiled_method();
2128   lock_nmethod(_nm);
2129 }
2130 
2131 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2132 // should pass zombie_ok == true.
2133 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2134   if (cm == NULL)  return;
2135   if (cm->is_aot()) return;  // FIXME: Revisit once _lock_count is added to aot_method
2136   nmethod* nm = cm->as_nmethod();
2137   Atomic::inc(&nm->_lock_count);
2138   assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2139 }
2140 
2141 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2142   if (cm == NULL)  return;
2143   if (cm->is_aot()) return;  // FIXME: Revisit once _lock_count is added to aot_method
2144   nmethod* nm = cm->as_nmethod();
2145   Atomic::dec(&nm->_lock_count);
2146   assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2147 }
2148 
2149 
2150 // -----------------------------------------------------------------------------
2151 // Verification
2152 
2153 class VerifyOopsClosure: public OopClosure {
2154   nmethod* _nm;
2155   bool     _ok;
2156 public:
2157   VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2158   bool ok() { return _ok; }
2159   virtual void do_oop(oop* p) {
2160     if (oopDesc::is_oop_or_null(*p)) return;
2161     if (_ok) {
2162       _nm->print_nmethod(true);
2163       _ok = false;
2164     }
2165     tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2166                   p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2167   }
2168   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2169 };
2170 
2171 void nmethod::verify() {
2172 
2173   // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2174   // seems odd.
2175 
2176   if (is_zombie() || is_not_entrant() || is_unloaded())
2177     return;
2178 
2179   // Make sure all the entry points are correctly aligned for patching.
2180   NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2181 
2182   // assert(oopDesc::is_oop(method()), "must be valid");
2183 
2184   ResourceMark rm;
2185 
2186   if (!CodeCache::contains(this)) {
2187     fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2188   }
2189 
2190   if(is_native_method() )
2191     return;
2192 
2193   nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2194   if (nm != this) {
2195     fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2196   }
2197 
2198   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2199     if (! p->verify(this)) {
2200       tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2201     }
2202   }
2203 
2204   VerifyOopsClosure voc(this);
2205   oops_do(&voc);
2206   assert(voc.ok(), "embedded oops must be OK");
2207   Universe::heap()->verify_nmethod(this);
2208 
2209   verify_scopes();
2210 }
2211 
2212 
2213 void nmethod::verify_interrupt_point(address call_site) {
2214   // Verify IC only when nmethod installation is finished.
2215   if (!is_not_installed()) {
2216     if (CompiledICLocker::is_safe(this)) {
2217       CompiledIC_at(this, call_site);
2218       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2219     } else {
2220       CompiledICLocker ml_verify(this);
2221       CompiledIC_at(this, call_site);
2222     }
2223   }
2224 
2225   PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2226   assert(pd != NULL, "PcDesc must exist");
2227   for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2228                                      pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2229                                      pd->return_oop());
2230        !sd->is_top(); sd = sd->sender()) {
2231     sd->verify();
2232   }
2233 }
2234 
2235 void nmethod::verify_scopes() {
2236   if( !method() ) return;       // Runtime stubs have no scope
2237   if (method()->is_native()) return; // Ignore stub methods.
2238   // iterate through all interrupt point
2239   // and verify the debug information is valid.
2240   RelocIterator iter((nmethod*)this);
2241   while (iter.next()) {
2242     address stub = NULL;
2243     switch (iter.type()) {
2244       case relocInfo::virtual_call_type:
2245         verify_interrupt_point(iter.addr());
2246         break;
2247       case relocInfo::opt_virtual_call_type:
2248         stub = iter.opt_virtual_call_reloc()->static_stub(false);
2249         verify_interrupt_point(iter.addr());
2250         break;
2251       case relocInfo::static_call_type:
2252         stub = iter.static_call_reloc()->static_stub(false);
2253         //verify_interrupt_point(iter.addr());
2254         break;
2255       case relocInfo::runtime_call_type:
2256       case relocInfo::runtime_call_w_cp_type: {
2257         address destination = iter.reloc()->value();
2258         // Right now there is no way to find out which entries support
2259         // an interrupt point.  It would be nice if we had this
2260         // information in a table.
2261         break;
2262       }
2263       default:
2264         break;
2265     }
2266     assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2267   }
2268 }
2269 
2270 
2271 // -----------------------------------------------------------------------------
2272 // Non-product code
2273 #ifndef PRODUCT
2274 
2275 class DebugScavengeRoot: public OopClosure {
2276   nmethod* _nm;
2277   bool     _ok;
2278 public:
2279   DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2280   bool ok() { return _ok; }
2281   virtual void do_oop(oop* p) {
2282     if ((*p) == NULL || !Universe::heap()->is_scavengable(*p))  return;
2283     if (_ok) {
2284       _nm->print_nmethod(true);
2285       _ok = false;
2286     }
2287     tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2288                   p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2289     (*p)->print();
2290   }
2291   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2292 };
2293 
2294 void nmethod::verify_scavenge_root_oops() {
2295   if (!on_scavenge_root_list()) {
2296     // Actually look inside, to verify the claim that it's clean.
2297     DebugScavengeRoot debug_scavenge_root(this);
2298     oops_do(&debug_scavenge_root);
2299     if (!debug_scavenge_root.ok())
2300       fatal("found an unadvertised bad scavengable oop in the code cache");
2301   }
2302   assert(scavenge_root_not_marked(), "");
2303 }
2304 
2305 #endif // PRODUCT
2306 
2307 // Printing operations
2308 
2309 void nmethod::print() const {
2310   ResourceMark rm;
2311   ttyLocker ttyl;   // keep the following output all in one block
2312 
2313   tty->print("Compiled method ");
2314 
2315   if (is_compiled_by_c1()) {
2316     tty->print("(c1) ");
2317   } else if (is_compiled_by_c2()) {
2318     tty->print("(c2) ");
2319   } else if (is_compiled_by_jvmci()) {
2320     tty->print("(JVMCI) ");
2321   } else {
2322     tty->print("(nm) ");
2323   }
2324 
2325   print_on(tty, NULL);
2326 
2327   if (WizardMode) {
2328     tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2329     tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2330     tty->print(" { ");
2331     tty->print_cr("%s ", state());
2332     if (on_scavenge_root_list())  tty->print("scavenge_root ");
2333     tty->print_cr("}:");
2334   }
2335   if (size              () > 0) tty->print_cr(" total in heap  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2336                                               p2i(this),
2337                                               p2i(this) + size(),
2338                                               size());
2339   if (relocation_size   () > 0) tty->print_cr(" relocation     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2340                                               p2i(relocation_begin()),
2341                                               p2i(relocation_end()),
2342                                               relocation_size());
2343   if (consts_size       () > 0) tty->print_cr(" constants      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2344                                               p2i(consts_begin()),
2345                                               p2i(consts_end()),
2346                                               consts_size());
2347   if (insts_size        () > 0) tty->print_cr(" main code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2348                                               p2i(insts_begin()),
2349                                               p2i(insts_end()),
2350                                               insts_size());
2351   if (stub_size         () > 0) tty->print_cr(" stub code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2352                                               p2i(stub_begin()),
2353                                               p2i(stub_end()),
2354                                               stub_size());
2355   if (oops_size         () > 0) tty->print_cr(" oops           [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2356                                               p2i(oops_begin()),
2357                                               p2i(oops_end()),
2358                                               oops_size());
2359   if (metadata_size      () > 0) tty->print_cr(" metadata       [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2360                                               p2i(metadata_begin()),
2361                                               p2i(metadata_end()),
2362                                               metadata_size());
2363   if (scopes_data_size  () > 0) tty->print_cr(" scopes data    [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2364                                               p2i(scopes_data_begin()),
2365                                               p2i(scopes_data_end()),
2366                                               scopes_data_size());
2367   if (scopes_pcs_size   () > 0) tty->print_cr(" scopes pcs     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2368                                               p2i(scopes_pcs_begin()),
2369                                               p2i(scopes_pcs_end()),
2370                                               scopes_pcs_size());
2371   if (dependencies_size () > 0) tty->print_cr(" dependencies   [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2372                                               p2i(dependencies_begin()),
2373                                               p2i(dependencies_end()),
2374                                               dependencies_size());
2375   if (handler_table_size() > 0) tty->print_cr(" handler table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2376                                               p2i(handler_table_begin()),
2377                                               p2i(handler_table_end()),
2378                                               handler_table_size());
2379   if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2380                                               p2i(nul_chk_table_begin()),
2381                                               p2i(nul_chk_table_end()),
2382                                               nul_chk_table_size());
2383 }
2384 
2385 #ifndef PRODUCT
2386 
2387 void nmethod::print_scopes() {
2388   // Find the first pc desc for all scopes in the code and print it.
2389   ResourceMark rm;
2390   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2391     if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2392       continue;
2393 
2394     ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2395     while (sd != NULL) {
2396       sd->print_on(tty, p);
2397       sd = sd->sender();
2398     }
2399   }
2400 }
2401 
2402 void nmethod::print_dependencies() {
2403   ResourceMark rm;
2404   ttyLocker ttyl;   // keep the following output all in one block
2405   tty->print_cr("Dependencies:");
2406   for (Dependencies::DepStream deps(this); deps.next(); ) {
2407     deps.print_dependency();
2408     Klass* ctxk = deps.context_type();
2409     if (ctxk != NULL) {
2410       if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2411         tty->print_cr("   [nmethod<=klass]%s", ctxk->external_name());
2412       }
2413     }
2414     deps.log_dependency();  // put it into the xml log also
2415   }
2416 }
2417 
2418 
2419 void nmethod::print_relocations() {
2420   ResourceMark m;       // in case methods get printed via the debugger
2421   tty->print_cr("relocations:");
2422   RelocIterator iter(this);
2423   iter.print();
2424 }
2425 
2426 
2427 void nmethod::print_pcs() {
2428   ResourceMark m;       // in case methods get printed via debugger
2429   tty->print_cr("pc-bytecode offsets:");
2430   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2431     p->print(this);
2432   }
2433 }
2434 
2435 void nmethod::print_recorded_oops() {
2436   tty->print_cr("Recorded oops:");
2437   for (int i = 0; i < oops_count(); i++) {
2438     oop o = oop_at(i);
2439     tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2440     if (o == Universe::non_oop_word()) {
2441       tty->print("non-oop word");
2442     } else {
2443       if (o != NULL) {
2444         o->print_value();
2445       } else {
2446         tty->print_cr("NULL");
2447       }
2448     }
2449     tty->cr();
2450   }
2451 }
2452 
2453 void nmethod::print_recorded_metadata() {
2454   tty->print_cr("Recorded metadata:");
2455   for (int i = 0; i < metadata_count(); i++) {
2456     Metadata* m = metadata_at(i);
2457     tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2458     if (m == (Metadata*)Universe::non_oop_word()) {
2459       tty->print("non-metadata word");
2460     } else {
2461       Metadata::print_value_on_maybe_null(tty, m);
2462     }
2463     tty->cr();
2464   }
2465 }
2466 
2467 #endif // PRODUCT
2468 
2469 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2470   RelocIterator iter(this, begin, end);
2471   bool have_one = false;
2472   while (iter.next()) {
2473     have_one = true;
2474     switch (iter.type()) {
2475         case relocInfo::none:                  return "no_reloc";
2476         case relocInfo::oop_type: {
2477           stringStream st;
2478           oop_Relocation* r = iter.oop_reloc();
2479           oop obj = r->oop_value();
2480           st.print("oop(");
2481           if (obj == NULL) st.print("NULL");
2482           else obj->print_value_on(&st);
2483           st.print(")");
2484           return st.as_string();
2485         }
2486         case relocInfo::metadata_type: {
2487           stringStream st;
2488           metadata_Relocation* r = iter.metadata_reloc();
2489           Metadata* obj = r->metadata_value();
2490           st.print("metadata(");
2491           if (obj == NULL) st.print("NULL");
2492           else obj->print_value_on(&st);
2493           st.print(")");
2494           return st.as_string();
2495         }
2496         case relocInfo::runtime_call_type:
2497         case relocInfo::runtime_call_w_cp_type: {
2498           stringStream st;
2499           st.print("runtime_call");
2500           CallRelocation* r = (CallRelocation*)iter.reloc();
2501           address dest = r->destination();
2502           CodeBlob* cb = CodeCache::find_blob(dest);
2503           if (cb != NULL) {
2504             st.print(" %s", cb->name());
2505           } else {
2506             ResourceMark rm;
2507             const int buflen = 1024;
2508             char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2509             int offset;
2510             if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2511               st.print(" %s", buf);
2512               if (offset != 0) {
2513                 st.print("+%d", offset);
2514               }
2515             }
2516           }
2517           return st.as_string();
2518         }
2519         case relocInfo::virtual_call_type: {
2520           stringStream st;
2521           st.print_raw("virtual_call");
2522           virtual_call_Relocation* r = iter.virtual_call_reloc();
2523           Method* m = r->method_value();
2524           if (m != NULL) {
2525             assert(m->is_method(), "");
2526             m->print_short_name(&st);
2527           }
2528           return st.as_string();
2529         }
2530         case relocInfo::opt_virtual_call_type: {
2531           stringStream st;
2532           st.print_raw("optimized virtual_call");
2533           opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2534           Method* m = r->method_value();
2535           if (m != NULL) {
2536             assert(m->is_method(), "");
2537             m->print_short_name(&st);
2538           }
2539           return st.as_string();
2540         }
2541         case relocInfo::static_call_type: {
2542           stringStream st;
2543           st.print_raw("static_call");
2544           static_call_Relocation* r = iter.static_call_reloc();
2545           Method* m = r->method_value();
2546           if (m != NULL) {
2547             assert(m->is_method(), "");
2548             m->print_short_name(&st);
2549           }
2550           return st.as_string();
2551         }
2552         case relocInfo::static_stub_type:      return "static_stub";
2553         case relocInfo::external_word_type:    return "external_word";
2554         case relocInfo::internal_word_type:    return "internal_word";
2555         case relocInfo::section_word_type:     return "section_word";
2556         case relocInfo::poll_type:             return "poll";
2557         case relocInfo::poll_return_type:      return "poll_return";
2558         case relocInfo::trampoline_stub_type:  return "trampoline_stub";
2559         case relocInfo::type_mask:             return "type_bit_mask";
2560 
2561         default:
2562           break;
2563     }
2564   }
2565   return have_one ? "other" : NULL;
2566 }
2567 
2568 // Return a the last scope in (begin..end]
2569 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2570   PcDesc* p = pc_desc_near(begin+1);
2571   if (p != NULL && p->real_pc(this) <= end) {
2572     return new ScopeDesc(this, p->scope_decode_offset(),
2573                          p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2574                          p->return_oop());
2575   }
2576   return NULL;
2577 }
2578 
2579 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2580   if (block_begin == entry_point())             stream->print_cr("[Entry Point]");
2581   if (block_begin == verified_entry_point())    stream->print_cr("[Verified Entry Point]");
2582   if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin())         stream->print_cr("[Exception Handler]");
2583   if (block_begin == stub_begin())              stream->print_cr("[Stub Code]");
2584   if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin())     stream->print_cr("[Deopt Handler Code]");
2585 
2586   if (has_method_handle_invokes())
2587     if (block_begin == deopt_mh_handler_begin())  stream->print_cr("[Deopt MH Handler Code]");
2588 
2589   if (block_begin == consts_begin())            stream->print_cr("[Constants]");
2590 
2591   if (block_begin == entry_point()) {
2592     methodHandle m = method();
2593     if (m.not_null()) {
2594       stream->print("  # ");
2595       m->print_value_on(stream);
2596       stream->cr();
2597     }
2598     if (m.not_null() && !is_osr_method()) {
2599       ResourceMark rm;
2600       int sizeargs = m->size_of_parameters();
2601       BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2602       VMRegPair* regs   = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2603       {
2604         int sig_index = 0;
2605         if (!m->is_static())
2606           sig_bt[sig_index++] = T_OBJECT; // 'this'
2607         for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2608           BasicType t = ss.type();
2609           sig_bt[sig_index++] = t;
2610           if (type2size[t] == 2) {
2611             sig_bt[sig_index++] = T_VOID;
2612           } else {
2613             assert(type2size[t] == 1, "size is 1 or 2");
2614           }
2615         }
2616         assert(sig_index == sizeargs, "");
2617       }
2618       const char* spname = "sp"; // make arch-specific?
2619       intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2620       int stack_slot_offset = this->frame_size() * wordSize;
2621       int tab1 = 14, tab2 = 24;
2622       int sig_index = 0;
2623       int arg_index = (m->is_static() ? 0 : -1);
2624       bool did_old_sp = false;
2625       for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2626         bool at_this = (arg_index == -1);
2627         bool at_old_sp = false;
2628         BasicType t = (at_this ? T_OBJECT : ss.type());
2629         assert(t == sig_bt[sig_index], "sigs in sync");
2630         if (at_this)
2631           stream->print("  # this: ");
2632         else
2633           stream->print("  # parm%d: ", arg_index);
2634         stream->move_to(tab1);
2635         VMReg fst = regs[sig_index].first();
2636         VMReg snd = regs[sig_index].second();
2637         if (fst->is_reg()) {
2638           stream->print("%s", fst->name());
2639           if (snd->is_valid())  {
2640             stream->print(":%s", snd->name());
2641           }
2642         } else if (fst->is_stack()) {
2643           int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2644           if (offset == stack_slot_offset)  at_old_sp = true;
2645           stream->print("[%s+0x%x]", spname, offset);
2646         } else {
2647           stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2648         }
2649         stream->print(" ");
2650         stream->move_to(tab2);
2651         stream->print("= ");
2652         if (at_this) {
2653           m->method_holder()->print_value_on(stream);
2654         } else {
2655           bool did_name = false;
2656           if (!at_this && ss.is_object()) {
2657             Symbol* name = ss.as_symbol_or_null();
2658             if (name != NULL) {
2659               name->print_value_on(stream);
2660               did_name = true;
2661             }
2662           }
2663           if (!did_name)
2664             stream->print("%s", type2name(t));
2665         }
2666         if (at_old_sp) {
2667           stream->print("  (%s of caller)", spname);
2668           did_old_sp = true;
2669         }
2670         stream->cr();
2671         sig_index += type2size[t];
2672         arg_index += 1;
2673         if (!at_this)  ss.next();
2674       }
2675       if (!did_old_sp) {
2676         stream->print("  # ");
2677         stream->move_to(tab1);
2678         stream->print("[%s+0x%x]", spname, stack_slot_offset);
2679         stream->print("  (%s of caller)", spname);
2680         stream->cr();
2681       }
2682     }
2683   }
2684 }
2685 
2686 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2687   // First, find an oopmap in (begin, end].
2688   // We use the odd half-closed interval so that oop maps and scope descs
2689   // which are tied to the byte after a call are printed with the call itself.
2690   address base = code_begin();
2691   ImmutableOopMapSet* oms = oop_maps();
2692   if (oms != NULL) {
2693     for (int i = 0, imax = oms->count(); i < imax; i++) {
2694       const ImmutableOopMapPair* pair = oms->pair_at(i);
2695       const ImmutableOopMap* om = pair->get_from(oms);
2696       address pc = base + pair->pc_offset();
2697       if (pc > begin) {
2698         if (pc <= end) {
2699           st->move_to(column);
2700           st->print("; ");
2701           om->print_on(st);
2702         }
2703         break;
2704       }
2705     }
2706   }
2707 
2708   // Print any debug info present at this pc.
2709   ScopeDesc* sd  = scope_desc_in(begin, end);
2710   if (sd != NULL) {
2711     st->move_to(column);
2712     if (sd->bci() == SynchronizationEntryBCI) {
2713       st->print(";*synchronization entry");
2714     } else if (sd->bci() == AfterBci) {
2715       st->print(";* method exit (unlocked if synchronized)");
2716     } else if (sd->bci() == UnwindBci) {
2717       st->print(";* unwind (locked if synchronized)");
2718     } else if (sd->bci() == AfterExceptionBci) {
2719       st->print(";* unwind (unlocked if synchronized)");
2720     } else if (sd->bci() == UnknownBci) {
2721       st->print(";* unknown");
2722     } else if (sd->bci() == InvalidFrameStateBci) {
2723       st->print(";* invalid frame state");
2724     } else {
2725       if (sd->method() == NULL) {
2726         st->print("method is NULL");
2727       } else if (sd->method()->is_native()) {
2728         st->print("method is native");
2729       } else {
2730         Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2731         st->print(";*%s", Bytecodes::name(bc));
2732         switch (bc) {
2733         case Bytecodes::_invokevirtual:
2734         case Bytecodes::_invokespecial:
2735         case Bytecodes::_invokestatic:
2736         case Bytecodes::_invokeinterface:
2737           {
2738             Bytecode_invoke invoke(sd->method(), sd->bci());
2739             st->print(" ");
2740             if (invoke.name() != NULL)
2741               invoke.name()->print_symbol_on(st);
2742             else
2743               st->print("<UNKNOWN>");
2744             break;
2745           }
2746         case Bytecodes::_getfield:
2747         case Bytecodes::_putfield:
2748         case Bytecodes::_getstatic:
2749         case Bytecodes::_putstatic:
2750           {
2751             Bytecode_field field(sd->method(), sd->bci());
2752             st->print(" ");
2753             if (field.name() != NULL)
2754               field.name()->print_symbol_on(st);
2755             else
2756               st->print("<UNKNOWN>");
2757           }
2758         default:
2759           break;
2760         }
2761       }
2762       st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2763     }
2764 
2765     // Print all scopes
2766     for (;sd != NULL; sd = sd->sender()) {
2767       st->move_to(column);
2768       st->print("; -");
2769       if (sd->method() == NULL) {
2770         st->print("method is NULL");
2771       } else {
2772         sd->method()->print_short_name(st);
2773       }
2774       int lineno = sd->method()->line_number_from_bci(sd->bci());
2775       if (lineno != -1) {
2776         st->print("@%d (line %d)", sd->bci(), lineno);
2777       } else {
2778         st->print("@%d", sd->bci());
2779       }
2780       st->cr();
2781     }
2782   }
2783 
2784   // Print relocation information
2785   const char* str = reloc_string_for(begin, end);
2786   if (str != NULL) {
2787     if (sd != NULL) st->cr();
2788     st->move_to(column);
2789     st->print(";   {%s}", str);
2790   }
2791   int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2792   if (cont_offset != 0) {
2793     st->move_to(column);
2794     st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2795   }
2796 
2797 }
2798 
2799 class DirectNativeCallWrapper: public NativeCallWrapper {
2800 private:
2801   NativeCall* _call;
2802 
2803 public:
2804   DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2805 
2806   virtual address destination() const { return _call->destination(); }
2807   virtual address instruction_address() const { return _call->instruction_address(); }
2808   virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2809   virtual address return_address() const { return _call->return_address(); }
2810 
2811   virtual address get_resolve_call_stub(bool is_optimized) const {
2812     if (is_optimized) {
2813       return SharedRuntime::get_resolve_opt_virtual_call_stub();
2814     }
2815     return SharedRuntime::get_resolve_virtual_call_stub();
2816   }
2817 
2818   virtual void set_destination_mt_safe(address dest) {
2819 #if INCLUDE_AOT
2820     if (UseAOT) {
2821       CodeBlob* callee = CodeCache::find_blob(dest);
2822       CompiledMethod* cm = callee->as_compiled_method_or_null();
2823       if (cm != NULL && cm->is_far_code()) {
2824         // Temporary fix, see JDK-8143106
2825         CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2826         csc->set_to_far(methodHandle(cm->method()), dest);
2827         return;
2828       }
2829     }
2830 #endif
2831     _call->set_destination_mt_safe(dest);
2832   }
2833 
2834   virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2835     CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2836 #if INCLUDE_AOT
2837     if (info.to_aot()) {
2838       csc->set_to_far(method, info.entry());
2839     } else
2840 #endif
2841     {
2842       csc->set_to_interpreted(method, info.entry());
2843     }
2844   }
2845 
2846   virtual void verify() const {
2847     // make sure code pattern is actually a call imm32 instruction
2848     _call->verify();
2849     _call->verify_alignment();
2850   }
2851 
2852   virtual void verify_resolve_call(address dest) const {
2853     CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2854     assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2855   }
2856 
2857   virtual bool is_call_to_interpreted(address dest) const {
2858     CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2859     return cb->contains(dest);
2860   }
2861 
2862   virtual bool is_safe_for_patching() const { return false; }
2863 
2864   virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2865     return nativeMovConstReg_at(r->cached_value());
2866   }
2867 
2868   virtual void *get_data(NativeInstruction* instruction) const {
2869     return (void*)((NativeMovConstReg*) instruction)->data();
2870   }
2871 
2872   virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2873     ((NativeMovConstReg*) instruction)->set_data(data);
2874   }
2875 };
2876 
2877 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2878   return new DirectNativeCallWrapper((NativeCall*) call);
2879 }
2880 
2881 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2882   return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2883 }
2884 
2885 address nmethod::call_instruction_address(address pc) const {
2886   if (NativeCall::is_call_before(pc)) {
2887     NativeCall *ncall = nativeCall_before(pc);
2888     return ncall->instruction_address();
2889   }
2890   return NULL;
2891 }
2892 
2893 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2894   return CompiledDirectStaticCall::at(call_site);
2895 }
2896 
2897 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2898   return CompiledDirectStaticCall::at(call_site);
2899 }
2900 
2901 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2902   return CompiledDirectStaticCall::before(return_addr);
2903 }
2904 
2905 #ifndef PRODUCT
2906 
2907 void nmethod::print_value_on(outputStream* st) const {
2908   st->print("nmethod");
2909   print_on(st, NULL);
2910 }
2911 
2912 void nmethod::print_calls(outputStream* st) {
2913   RelocIterator iter(this);
2914   while (iter.next()) {
2915     switch (iter.type()) {
2916     case relocInfo::virtual_call_type:
2917     case relocInfo::opt_virtual_call_type: {
2918       CompiledICLocker ml_verify(this);
2919       CompiledIC_at(&iter)->print();
2920       break;
2921     }
2922     case relocInfo::static_call_type:
2923       st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2924       CompiledDirectStaticCall::at(iter.reloc())->print();
2925       break;
2926     default:
2927       break;
2928     }
2929   }
2930 }
2931 
2932 void nmethod::print_handler_table() {
2933   ExceptionHandlerTable(this).print();
2934 }
2935 
2936 void nmethod::print_nul_chk_table() {
2937   ImplicitExceptionTable(this).print(code_begin());
2938 }
2939 
2940 void nmethod::print_statistics() {
2941   ttyLocker ttyl;
2942   if (xtty != NULL)  xtty->head("statistics type='nmethod'");
2943   native_nmethod_stats.print_native_nmethod_stats();
2944 #ifdef COMPILER1
2945   c1_java_nmethod_stats.print_nmethod_stats("C1");
2946 #endif
2947 #ifdef COMPILER2
2948   c2_java_nmethod_stats.print_nmethod_stats("C2");
2949 #endif
2950 #if INCLUDE_JVMCI
2951   jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2952 #endif
2953   unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2954   DebugInformationRecorder::print_statistics();
2955 #ifndef PRODUCT
2956   pc_nmethod_stats.print_pc_stats();
2957 #endif
2958   Dependencies::print_statistics();
2959   if (xtty != NULL)  xtty->tail("statistics");
2960 }
2961 
2962 #endif // !PRODUCT
2963 
2964 #if INCLUDE_JVMCI
2965 void nmethod::maybe_invalidate_installed_code() {
2966   if (!is_compiled_by_jvmci()) {
2967     return;
2968   }
2969 
2970   assert(Patching_lock->is_locked() ||
2971          SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2972   oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2973   if (installed_code != NULL) {
2974     // Update the values in the InstalledCode instance if it still refers to this nmethod
2975     nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2976     if (nm == this) {
2977       if (!is_alive() || is_unloading()) {
2978         // Break the link between nmethod and InstalledCode such that the nmethod
2979         // can subsequently be flushed safely.  The link must be maintained while
2980         // the method could have live activations since invalidateInstalledCode
2981         // might want to invalidate all existing activations.
2982         InstalledCode::set_address(installed_code, 0);
2983         InstalledCode::set_entryPoint(installed_code, 0);
2984       } else if (is_not_entrant()) {
2985         // Remove the entry point so any invocation will fail but keep
2986         // the address link around that so that existing activations can
2987         // be invalidated.
2988         InstalledCode::set_entryPoint(installed_code, 0);
2989       }
2990     }
2991   }
2992 }
2993 
2994 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2995   if (installedCode() == NULL) {
2996     THROW(vmSymbols::java_lang_NullPointerException());
2997   }
2998   jlong nativeMethod = InstalledCode::address(installedCode);
2999   nmethod* nm = (nmethod*)nativeMethod;
3000   if (nm == NULL) {
3001     // Nothing to do
3002     return;
3003   }
3004 
3005   nmethodLocker nml(nm);
3006 #ifdef ASSERT
3007   {
3008     MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3009     // This relationship can only be checked safely under a lock
3010     assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3011   }
3012 #endif
3013 
3014   if (nm->is_alive()) {
3015     // Invalidating the InstalledCode means we want the nmethod
3016     // to be deoptimized.
3017     nm->mark_for_deoptimization();
3018     VM_Deoptimize op;
3019     VMThread::execute(&op);
3020   }
3021 
3022   // Multiple threads could reach this point so we now need to
3023   // lock and re-check the link to the nmethod so that only one
3024   // thread clears it.
3025   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3026   if (InstalledCode::address(installedCode) == nativeMethod) {
3027       InstalledCode::set_address(installedCode, 0);
3028   }
3029 }
3030 
3031 oop nmethod::jvmci_installed_code() {
3032   return JNIHandles::resolve(_jvmci_installed_code);
3033 }
3034 
3035 oop nmethod::speculation_log() {
3036   return JNIHandles::resolve(_speculation_log);
3037 }
3038 
3039 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
3040   if (!this->is_compiled_by_jvmci()) {
3041     return NULL;
3042   }
3043   oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3044   if (installed_code != NULL) {
3045     oop installed_code_name = NULL;
3046     if (installed_code->is_a(InstalledCode::klass())) {
3047       installed_code_name = InstalledCode::name(installed_code);
3048     }
3049     if (installed_code_name != NULL) {
3050       return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
3051     }
3052   }
3053   return NULL;
3054 }
3055 #endif