rev 47445 : 8171853: Remove Shark compiler

   1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "code/codeCache.hpp"
  27 #include "code/compiledIC.hpp"
  28 #include "code/dependencies.hpp"
  29 #include "code/nativeInst.hpp"
  30 #include "code/nmethod.hpp"
  31 #include "code/scopeDesc.hpp"
  32 #include "compiler/abstractCompiler.hpp"
  33 #include "compiler/compileBroker.hpp"
  34 #include "compiler/compileLog.hpp"
  35 #include "compiler/compilerDirectives.hpp"
  36 #include "compiler/directivesParser.hpp"
  37 #include "compiler/disassembler.hpp"
  38 #include "interpreter/bytecode.hpp"
  39 #include "logging/log.hpp"
  40 #include "logging/logStream.hpp"
  41 #include "memory/resourceArea.hpp"
  42 #include "oops/methodData.hpp"
  43 #include "oops/oop.inline.hpp"
  44 #include "prims/jvm.h"
  45 #include "prims/jvmtiImpl.hpp"
  46 #include "runtime/atomic.hpp"
  47 #include "runtime/orderAccess.inline.hpp"
  48 #include "runtime/os.hpp"
  49 #include "runtime/sharedRuntime.hpp"
  50 #include "runtime/sweeper.hpp"
  51 #include "utilities/align.hpp"
  52 #include "utilities/dtrace.hpp"
  53 #include "utilities/events.hpp"
  54 #include "utilities/resourceHash.hpp"
  55 #include "utilities/xmlstream.hpp"
  56 #ifdef SHARK
  57 #include "shark/sharkCompiler.hpp"
  58 #endif
  59 #if INCLUDE_JVMCI
  60 #include "jvmci/jvmciJavaClasses.hpp"
  61 #endif
  62 
  63 #ifdef DTRACE_ENABLED
  64 
  65 // Only bother with this argument setup if dtrace is available
  66 
  67 #define DTRACE_METHOD_UNLOAD_PROBE(method)                                \
  68   {                                                                       \
  69     Method* m = (method);                                                 \
  70     if (m != NULL) {                                                      \
  71       Symbol* klass_name = m->klass_name();                               \
  72       Symbol* name = m->name();                                           \
  73       Symbol* signature = m->signature();                                 \
  74       HOTSPOT_COMPILED_METHOD_UNLOAD(                                     \
  75         (char *) klass_name->bytes(), klass_name->utf8_length(),                   \
  76         (char *) name->bytes(), name->utf8_length(),                               \
  77         (char *) signature->bytes(), signature->utf8_length());                    \
  78     }                                                                     \
  79   }
  80 
  81 #else //  ndef DTRACE_ENABLED
  82 
  83 #define DTRACE_METHOD_UNLOAD_PROBE(method)
  84 
  85 #endif
  86 
  87 //---------------------------------------------------------------------------------
  88 // NMethod statistics
  89 // They are printed under various flags, including:
  90 //   PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
  91 // (In the latter two cases, they like other stats are printed to the log only.)
  92 
  93 #ifndef PRODUCT
  94 // These variables are put into one block to reduce relocations
  95 // and make it simpler to print from the debugger.
  96 struct java_nmethod_stats_struct {
  97   int nmethod_count;
  98   int total_size;
  99   int relocation_size;
 100   int consts_size;
 101   int insts_size;
 102   int stub_size;
 103   int scopes_data_size;
 104   int scopes_pcs_size;
 105   int dependencies_size;
 106   int handler_table_size;
 107   int nul_chk_table_size;
 108   int oops_size;
 109   int metadata_size;
 110 
 111   void note_nmethod(nmethod* nm) {
 112     nmethod_count += 1;
 113     total_size          += nm->size();
 114     relocation_size     += nm->relocation_size();
 115     consts_size         += nm->consts_size();
 116     insts_size          += nm->insts_size();
 117     stub_size           += nm->stub_size();
 118     oops_size           += nm->oops_size();
 119     metadata_size       += nm->metadata_size();
 120     scopes_data_size    += nm->scopes_data_size();
 121     scopes_pcs_size     += nm->scopes_pcs_size();
 122     dependencies_size   += nm->dependencies_size();
 123     handler_table_size  += nm->handler_table_size();
 124     nul_chk_table_size  += nm->nul_chk_table_size();
 125   }
 126   void print_nmethod_stats(const char* name) {
 127     if (nmethod_count == 0)  return;
 128     tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
 129     if (total_size != 0)          tty->print_cr(" total in heap  = %d", total_size);
 130     if (nmethod_count != 0)       tty->print_cr(" header         = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
 131     if (relocation_size != 0)     tty->print_cr(" relocation     = %d", relocation_size);
 132     if (consts_size != 0)         tty->print_cr(" constants      = %d", consts_size);
 133     if (insts_size != 0)          tty->print_cr(" main code      = %d", insts_size);
 134     if (stub_size != 0)           tty->print_cr(" stub code      = %d", stub_size);
 135     if (oops_size != 0)           tty->print_cr(" oops           = %d", oops_size);
 136     if (metadata_size != 0)       tty->print_cr(" metadata       = %d", metadata_size);
 137     if (scopes_data_size != 0)    tty->print_cr(" scopes data    = %d", scopes_data_size);
 138     if (scopes_pcs_size != 0)     tty->print_cr(" scopes pcs     = %d", scopes_pcs_size);
 139     if (dependencies_size != 0)   tty->print_cr(" dependencies   = %d", dependencies_size);
 140     if (handler_table_size != 0)  tty->print_cr(" handler table  = %d", handler_table_size);
 141     if (nul_chk_table_size != 0)  tty->print_cr(" nul chk table  = %d", nul_chk_table_size);
 142   }
 143 };
 144 
 145 struct native_nmethod_stats_struct {
 146   int native_nmethod_count;
 147   int native_total_size;
 148   int native_relocation_size;
 149   int native_insts_size;
 150   int native_oops_size;
 151   int native_metadata_size;
 152   void note_native_nmethod(nmethod* nm) {
 153     native_nmethod_count += 1;
 154     native_total_size       += nm->size();
 155     native_relocation_size  += nm->relocation_size();
 156     native_insts_size       += nm->insts_size();
 157     native_oops_size        += nm->oops_size();
 158     native_metadata_size    += nm->metadata_size();
 159   }
 160   void print_native_nmethod_stats() {
 161     if (native_nmethod_count == 0)  return;
 162     tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
 163     if (native_total_size != 0)       tty->print_cr(" N. total size  = %d", native_total_size);
 164     if (native_relocation_size != 0)  tty->print_cr(" N. relocation  = %d", native_relocation_size);
 165     if (native_insts_size != 0)       tty->print_cr(" N. main code   = %d", native_insts_size);
 166     if (native_oops_size != 0)        tty->print_cr(" N. oops        = %d", native_oops_size);
 167     if (native_metadata_size != 0)    tty->print_cr(" N. metadata    = %d", native_metadata_size);
 168   }
 169 };
 170 
 171 struct pc_nmethod_stats_struct {
 172   int pc_desc_resets;   // number of resets (= number of caches)
 173   int pc_desc_queries;  // queries to nmethod::find_pc_desc
 174   int pc_desc_approx;   // number of those which have approximate true
 175   int pc_desc_repeats;  // number of _pc_descs[0] hits
 176   int pc_desc_hits;     // number of LRU cache hits
 177   int pc_desc_tests;    // total number of PcDesc examinations
 178   int pc_desc_searches; // total number of quasi-binary search steps
 179   int pc_desc_adds;     // number of LUR cache insertions
 180 
 181   void print_pc_stats() {
 182     tty->print_cr("PcDesc Statistics:  %d queries, %.2f comparisons per query",
 183                   pc_desc_queries,
 184                   (double)(pc_desc_tests + pc_desc_searches)
 185                   / pc_desc_queries);
 186     tty->print_cr("  caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
 187                   pc_desc_resets,
 188                   pc_desc_queries, pc_desc_approx,
 189                   pc_desc_repeats, pc_desc_hits,
 190                   pc_desc_tests, pc_desc_searches, pc_desc_adds);
 191   }
 192 };
 193 
 194 #ifdef COMPILER1
 195 static java_nmethod_stats_struct c1_java_nmethod_stats;
 196 #endif
 197 #ifdef COMPILER2
 198 static java_nmethod_stats_struct c2_java_nmethod_stats;
 199 #endif
 200 #if INCLUDE_JVMCI
 201 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
 202 #endif
 203 #ifdef SHARK
 204 static java_nmethod_stats_struct shark_java_nmethod_stats;
 205 #endif
 206 static java_nmethod_stats_struct unknown_java_nmethod_stats;
 207 
 208 static native_nmethod_stats_struct native_nmethod_stats;
 209 static pc_nmethod_stats_struct pc_nmethod_stats;
 210 
 211 static void note_java_nmethod(nmethod* nm) {
 212 #ifdef COMPILER1
 213   if (nm->is_compiled_by_c1()) {
 214     c1_java_nmethod_stats.note_nmethod(nm);
 215   } else
 216 #endif
 217 #ifdef COMPILER2
 218   if (nm->is_compiled_by_c2()) {
 219     c2_java_nmethod_stats.note_nmethod(nm);
 220   } else
 221 #endif
 222 #if INCLUDE_JVMCI
 223   if (nm->is_compiled_by_jvmci()) {
 224     jvmci_java_nmethod_stats.note_nmethod(nm);
 225   } else
 226 #endif
 227 #ifdef SHARK
 228   if (nm->is_compiled_by_shark()) {
 229     shark_java_nmethod_stats.note_nmethod(nm);
 230   } else
 231 #endif
 232   {
 233     unknown_java_nmethod_stats.note_nmethod(nm);
 234   }
 235 }
 236 #endif // !PRODUCT
 237 
 238 //---------------------------------------------------------------------------------
 239 
 240 
 241 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
 242   assert(pc != NULL, "Must be non null");
 243   assert(exception.not_null(), "Must be non null");
 244   assert(handler != NULL, "Must be non null");
 245 
 246   _count = 0;
 247   _exception_type = exception->klass();
 248   _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 //-----------------------------------------------------------------------------
 299 
 300 
 301 // Helper used by both find_pc_desc methods.
 302 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
 303   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
 304   if (!approximate)
 305     return pc->pc_offset() == pc_offset;
 306   else
 307     return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
 308 }
 309 
 310 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
 311   if (initial_pc_desc == NULL) {
 312     _pc_descs[0] = NULL; // native method; no PcDescs at all
 313     return;
 314   }
 315   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
 316   // reset the cache by filling it with benign (non-null) values
 317   assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
 318   for (int i = 0; i < cache_size; i++)
 319     _pc_descs[i] = initial_pc_desc;
 320 }
 321 
 322 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
 323   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
 324   NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
 325 
 326   // Note: one might think that caching the most recently
 327   // read value separately would be a win, but one would be
 328   // wrong.  When many threads are updating it, the cache
 329   // line it's in would bounce between caches, negating
 330   // any benefit.
 331 
 332   // In order to prevent race conditions do not load cache elements
 333   // repeatedly, but use a local copy:
 334   PcDesc* res;
 335 
 336   // Step one:  Check the most recently added value.
 337   res = _pc_descs[0];
 338   if (res == NULL) return NULL;  // native method; no PcDescs at all
 339   if (match_desc(res, pc_offset, approximate)) {
 340     NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
 341     return res;
 342   }
 343 
 344   // Step two:  Check the rest of the LRU cache.
 345   for (int i = 1; i < cache_size; ++i) {
 346     res = _pc_descs[i];
 347     if (res->pc_offset() < 0) break;  // optimization: skip empty cache
 348     if (match_desc(res, pc_offset, approximate)) {
 349       NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
 350       return res;
 351     }
 352   }
 353 
 354   // Report failure.
 355   return NULL;
 356 }
 357 
 358 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
 359   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
 360   // Update the LRU cache by shifting pc_desc forward.
 361   for (int i = 0; i < cache_size; i++)  {
 362     PcDesc* next = _pc_descs[i];
 363     _pc_descs[i] = pc_desc;
 364     pc_desc = next;
 365   }
 366 }
 367 
 368 // adjust pcs_size so that it is a multiple of both oopSize and
 369 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
 370 // of oopSize, then 2*sizeof(PcDesc) is)
 371 static int adjust_pcs_size(int pcs_size) {
 372   int nsize = align_up(pcs_size,   oopSize);
 373   if ((nsize % sizeof(PcDesc)) != 0) {
 374     nsize = pcs_size + sizeof(PcDesc);
 375   }
 376   assert((nsize % oopSize) == 0, "correct alignment");
 377   return nsize;
 378 }
 379 
 380 
 381 int nmethod::total_size() const {
 382   return
 383     consts_size()        +
 384     insts_size()         +
 385     stub_size()          +
 386     scopes_data_size()   +
 387     scopes_pcs_size()    +
 388     handler_table_size() +
 389     nul_chk_table_size();
 390 }
 391 
 392 const char* nmethod::compile_kind() const {
 393   if (is_osr_method())     return "osr";
 394   if (method() != NULL && is_native_method())  return "c2n";
 395   return NULL;
 396 }
 397 
 398 // Fill in default values for various flag fields
 399 void nmethod::init_defaults() {
 400   _state                      = in_use;
 401   _has_flushed_dependencies   = 0;
 402   _lock_count                 = 0;
 403   _stack_traversal_mark       = 0;
 404   _unload_reported            = false; // jvmti state
 405   _is_far_code                = false; // nmethods are located in CodeCache
 406 
 407 #ifdef ASSERT
 408   _oops_are_stale             = false;
 409 #endif
 410 
 411   _oops_do_mark_link       = NULL;
 412   _jmethod_id              = NULL;
 413   _osr_link                = NULL;
 414   _unloading_next          = NULL;
 415   _scavenge_root_link      = NULL;
 416   _scavenge_root_state     = 0;
 417 #if INCLUDE_RTM_OPT
 418   _rtm_state               = NoRTM;
 419 #endif
 420 #if INCLUDE_JVMCI
 421   _jvmci_installed_code   = NULL;
 422   _speculation_log        = NULL;
 423 #endif
 424 }
 425 
 426 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
 427   int compile_id,
 428   CodeBuffer *code_buffer,
 429   int vep_offset,
 430   int frame_complete,
 431   int frame_size,
 432   ByteSize basic_lock_owner_sp_offset,
 433   ByteSize basic_lock_sp_offset,
 434   OopMapSet* oop_maps) {
 435   code_buffer->finalize_oop_references(method);
 436   // create nmethod
 437   nmethod* nm = NULL;
 438   {
 439     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 440     int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
 441     CodeOffsets offsets;
 442     offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
 443     offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
 444     nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
 445                                             compile_id, &offsets,
 446                                             code_buffer, frame_size,
 447                                             basic_lock_owner_sp_offset,
 448                                             basic_lock_sp_offset, oop_maps);
 449     NOT_PRODUCT(if (nm != NULL)  native_nmethod_stats.note_native_nmethod(nm));
 450   }
 451   // verify nmethod
 452   debug_only(if (nm) nm->verify();) // might block
 453 
 454   if (nm != NULL) {
 455     nm->log_new_nmethod();
 456   }
 457 
 458   return nm;
 459 }
 460 
 461 nmethod* nmethod::new_nmethod(const methodHandle& method,
 462   int compile_id,
 463   int entry_bci,
 464   CodeOffsets* offsets,
 465   int orig_pc_offset,
 466   DebugInformationRecorder* debug_info,
 467   Dependencies* dependencies,
 468   CodeBuffer* code_buffer, int frame_size,
 469   OopMapSet* oop_maps,
 470   ExceptionHandlerTable* handler_table,
 471   ImplicitExceptionTable* nul_chk_table,
 472   AbstractCompiler* compiler,
 473   int comp_level
 474 #if INCLUDE_JVMCI
 475   , Handle installed_code,
 476   Handle speculationLog
 477 #endif
 478 )
 479 {
 480   assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
 481   code_buffer->finalize_oop_references(method);
 482   // create nmethod
 483   nmethod* nm = NULL;
 484   { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 485     int nmethod_size =
 486       CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
 487       + adjust_pcs_size(debug_info->pcs_size())
 488       + align_up((int)dependencies->size_in_bytes(), oopSize)
 489       + align_up(handler_table->size_in_bytes()    , oopSize)
 490       + align_up(nul_chk_table->size_in_bytes()    , oopSize)
 491       + align_up(debug_info->data_size()           , oopSize);
 492 
 493     nm = new (nmethod_size, comp_level)
 494     nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
 495             orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
 496             oop_maps,
 497             handler_table,
 498             nul_chk_table,
 499             compiler,
 500             comp_level
 501 #if INCLUDE_JVMCI
 502             , installed_code,
 503             speculationLog
 504 #endif
 505             );
 506 
 507     if (nm != NULL) {
 508       // To make dependency checking during class loading fast, record
 509       // the nmethod dependencies in the classes it is dependent on.
 510       // This allows the dependency checking code to simply walk the
 511       // class hierarchy above the loaded class, checking only nmethods
 512       // which are dependent on those classes.  The slow way is to
 513       // check every nmethod for dependencies which makes it linear in
 514       // the number of methods compiled.  For applications with a lot
 515       // classes the slow way is too slow.
 516       for (Dependencies::DepStream deps(nm); deps.next(); ) {
 517         if (deps.type() == Dependencies::call_site_target_value) {
 518           // CallSite dependencies are managed on per-CallSite instance basis.
 519           oop call_site = deps.argument_oop(0);
 520           MethodHandles::add_dependent_nmethod(call_site, nm);
 521         } else {
 522           Klass* klass = deps.context_type();
 523           if (klass == NULL) {
 524             continue;  // ignore things like evol_method
 525           }
 526           // record this nmethod as dependent on this klass
 527           InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
 528         }
 529       }
 530       NOT_PRODUCT(if (nm != NULL)  note_java_nmethod(nm));
 531     }
 532   }
 533   // Do verification and logging outside CodeCache_lock.
 534   if (nm != NULL) {
 535     // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
 536     DEBUG_ONLY(nm->verify();)
 537     nm->log_new_nmethod();
 538   }
 539   return nm;
 540 }
 541 
 542 // For native wrappers
 543 nmethod::nmethod(
 544   Method* method,
 545   CompilerType type,
 546   int nmethod_size,
 547   int compile_id,
 548   CodeOffsets* offsets,
 549   CodeBuffer* code_buffer,
 550   int frame_size,
 551   ByteSize basic_lock_owner_sp_offset,
 552   ByteSize basic_lock_sp_offset,
 553   OopMapSet* oop_maps )
 554   : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
 555   _native_receiver_sp_offset(basic_lock_owner_sp_offset),
 556   _native_basic_lock_sp_offset(basic_lock_sp_offset)
 557 {
 558   {
 559     int scopes_data_offset = 0;
 560     int deoptimize_offset       = 0;
 561     int deoptimize_mh_offset    = 0;
 562 
 563     debug_only(NoSafepointVerifier nsv;)
 564     assert_locked_or_safepoint(CodeCache_lock);
 565 
 566     init_defaults();
 567     _entry_bci               = InvocationEntryBci;
 568     // We have no exception handler or deopt handler make the
 569     // values something that will never match a pc like the nmethod vtable entry
 570     _exception_offset        = 0;
 571     _orig_pc_offset          = 0;
 572 
 573     _consts_offset           = data_offset();
 574     _stub_offset             = data_offset();
 575     _oops_offset             = data_offset();
 576     _metadata_offset         = _oops_offset         + align_up(code_buffer->total_oop_size(), oopSize);
 577     scopes_data_offset       = _metadata_offset     + align_up(code_buffer->total_metadata_size(), wordSize);
 578     _scopes_pcs_offset       = scopes_data_offset;
 579     _dependencies_offset     = _scopes_pcs_offset;
 580     _handler_table_offset    = _dependencies_offset;
 581     _nul_chk_table_offset    = _handler_table_offset;
 582     _nmethod_end_offset      = _nul_chk_table_offset;
 583     _compile_id              = compile_id;
 584     _comp_level              = CompLevel_none;
 585     _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
 586     _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
 587     _osr_entry_point         = NULL;
 588     _exception_cache         = NULL;
 589     _pc_desc_container.reset_to(NULL);
 590     _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
 591 
 592     _scopes_data_begin = (address) this + scopes_data_offset;
 593     _deopt_handler_begin = (address) this + deoptimize_offset;
 594     _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
 595 
 596     code_buffer->copy_code_and_locs_to(this);
 597     code_buffer->copy_values_to(this);
 598     if (ScavengeRootsInCode) {
 599       Universe::heap()->register_nmethod(this);
 600     }
 601     debug_only(Universe::heap()->verify_nmethod(this));
 602     CodeCache::commit(this);
 603   }
 604 
 605   if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
 606     ttyLocker ttyl;  // keep the following output all in one block
 607     // This output goes directly to the tty, not the compiler log.
 608     // To enable tools to match it up with the compilation activity,
 609     // be sure to tag this tty output with the compile ID.
 610     if (xtty != NULL) {
 611       xtty->begin_head("print_native_nmethod");
 612       xtty->method(_method);
 613       xtty->stamp();
 614       xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
 615     }
 616     // print the header part first
 617     print();
 618     // then print the requested information
 619     if (PrintNativeNMethods) {
 620       print_code();
 621       if (oop_maps != NULL) {
 622         oop_maps->print();
 623       }
 624     }
 625     if (PrintRelocations) {
 626       print_relocations();
 627     }
 628     if (xtty != NULL) {
 629       xtty->tail("print_native_nmethod");
 630     }
 631   }
 632 }
 633 
 634 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
 635   return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
 636 }
 637 
 638 nmethod::nmethod(
 639   Method* method,
 640   CompilerType type,
 641   int nmethod_size,
 642   int compile_id,
 643   int entry_bci,
 644   CodeOffsets* offsets,
 645   int orig_pc_offset,
 646   DebugInformationRecorder* debug_info,
 647   Dependencies* dependencies,
 648   CodeBuffer *code_buffer,
 649   int frame_size,
 650   OopMapSet* oop_maps,
 651   ExceptionHandlerTable* handler_table,
 652   ImplicitExceptionTable* nul_chk_table,
 653   AbstractCompiler* compiler,
 654   int comp_level
 655 #if INCLUDE_JVMCI
 656   , Handle installed_code,
 657   Handle speculation_log
 658 #endif
 659   )
 660   : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
 661   _native_receiver_sp_offset(in_ByteSize(-1)),
 662   _native_basic_lock_sp_offset(in_ByteSize(-1))
 663 {
 664   assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
 665   {
 666     debug_only(NoSafepointVerifier nsv;)
 667     assert_locked_or_safepoint(CodeCache_lock);
 668 
 669     _deopt_handler_begin = (address) this;
 670     _deopt_mh_handler_begin = (address) this;
 671 
 672     init_defaults();
 673     _entry_bci               = entry_bci;
 674     _compile_id              = compile_id;
 675     _comp_level              = comp_level;
 676     _orig_pc_offset          = orig_pc_offset;
 677     _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
 678 
 679     // Section offsets
 680     _consts_offset           = content_offset()      + code_buffer->total_offset_of(code_buffer->consts());
 681     _stub_offset             = content_offset()      + code_buffer->total_offset_of(code_buffer->stubs());
 682     set_ctable_begin(header_begin() + _consts_offset);
 683 
 684 #if INCLUDE_JVMCI
 685     _jvmci_installed_code = installed_code();
 686     _speculation_log = (instanceOop)speculation_log();
 687 
 688     if (compiler->is_jvmci()) {
 689       // JVMCI might not produce any stub sections
 690       if (offsets->value(CodeOffsets::Exceptions) != -1) {
 691         _exception_offset        = code_offset()          + offsets->value(CodeOffsets::Exceptions);
 692       } else {
 693         _exception_offset = -1;
 694       }
 695       if (offsets->value(CodeOffsets::Deopt) != -1) {
 696         _deopt_handler_begin       = (address) this + code_offset()          + offsets->value(CodeOffsets::Deopt);
 697       } else {
 698         _deopt_handler_begin = NULL;
 699       }
 700       if (offsets->value(CodeOffsets::DeoptMH) != -1) {
 701         _deopt_mh_handler_begin  = (address) this + code_offset()          + offsets->value(CodeOffsets::DeoptMH);
 702       } else {
 703         _deopt_mh_handler_begin = NULL;
 704       }
 705     } else {
 706 #endif
 707     // Exception handler and deopt handler are in the stub section
 708     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
 709     assert(offsets->value(CodeOffsets::Deopt     ) != -1, "must be set");
 710 
 711     _exception_offset       = _stub_offset          + offsets->value(CodeOffsets::Exceptions);
 712     _deopt_handler_begin    = (address) this + _stub_offset          + offsets->value(CodeOffsets::Deopt);
 713     if (offsets->value(CodeOffsets::DeoptMH) != -1) {
 714       _deopt_mh_handler_begin  = (address) this + _stub_offset          + offsets->value(CodeOffsets::DeoptMH);
 715     } else {
 716       _deopt_mh_handler_begin  = NULL;
 717 #if INCLUDE_JVMCI
 718     }
 719 #endif
 720     }
 721     if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
 722       _unwind_handler_offset = code_offset()         + offsets->value(CodeOffsets::UnwindHandler);
 723     } else {
 724       _unwind_handler_offset = -1;
 725     }
 726 
 727     _oops_offset             = data_offset();
 728     _metadata_offset         = _oops_offset          + align_up(code_buffer->total_oop_size(), oopSize);
 729     int scopes_data_offset   = _metadata_offset      + align_up(code_buffer->total_metadata_size(), wordSize);
 730 
 731     _scopes_pcs_offset       = scopes_data_offset    + align_up(debug_info->data_size       (), oopSize);
 732     _dependencies_offset     = _scopes_pcs_offset    + adjust_pcs_size(debug_info->pcs_size());
 733     _handler_table_offset    = _dependencies_offset  + align_up((int)dependencies->size_in_bytes (), oopSize);
 734     _nul_chk_table_offset    = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
 735     _nmethod_end_offset      = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
 736     _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
 737     _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
 738     _osr_entry_point         = code_begin()          + offsets->value(CodeOffsets::OSR_Entry);
 739     _exception_cache         = NULL;
 740 
 741     _scopes_data_begin = (address) this + scopes_data_offset;
 742 
 743     _pc_desc_container.reset_to(scopes_pcs_begin());
 744 
 745     code_buffer->copy_code_and_locs_to(this);
 746     // Copy contents of ScopeDescRecorder to nmethod
 747     code_buffer->copy_values_to(this);
 748     debug_info->copy_to(this);
 749     dependencies->copy_to(this);
 750     if (ScavengeRootsInCode) {
 751       Universe::heap()->register_nmethod(this);
 752     }
 753     debug_only(Universe::heap()->verify_nmethod(this));
 754 
 755     CodeCache::commit(this);
 756 
 757     // Copy contents of ExceptionHandlerTable to nmethod
 758     handler_table->copy_to(this);
 759     nul_chk_table->copy_to(this);
 760 
 761     // we use the information of entry points to find out if a method is
 762     // static or non static
 763     assert(compiler->is_c2() || compiler->is_jvmci() ||
 764            _method->is_static() == (entry_point() == _verified_entry_point),
 765            " entry points must be same for static methods and vice versa");
 766   }
 767 }
 768 
 769 // Print a short set of xml attributes to identify this nmethod.  The
 770 // output should be embedded in some other element.
 771 void nmethod::log_identity(xmlStream* log) const {
 772   log->print(" compile_id='%d'", compile_id());
 773   const char* nm_kind = compile_kind();
 774   if (nm_kind != NULL)  log->print(" compile_kind='%s'", nm_kind);
 775   log->print(" compiler='%s'", compiler_name());
 776   if (TieredCompilation) {
 777     log->print(" level='%d'", comp_level());
 778   }
 779 }
 780 
 781 
 782 #define LOG_OFFSET(log, name)                    \
 783   if (p2i(name##_end()) - p2i(name##_begin())) \
 784     log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'"    , \
 785                p2i(name##_begin()) - p2i(this))
 786 
 787 
 788 void nmethod::log_new_nmethod() const {
 789   if (LogCompilation && xtty != NULL) {
 790     ttyLocker ttyl;
 791     HandleMark hm;
 792     xtty->begin_elem("nmethod");
 793     log_identity(xtty);
 794     xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
 795     xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
 796 
 797     LOG_OFFSET(xtty, relocation);
 798     LOG_OFFSET(xtty, consts);
 799     LOG_OFFSET(xtty, insts);
 800     LOG_OFFSET(xtty, stub);
 801     LOG_OFFSET(xtty, scopes_data);
 802     LOG_OFFSET(xtty, scopes_pcs);
 803     LOG_OFFSET(xtty, dependencies);
 804     LOG_OFFSET(xtty, handler_table);
 805     LOG_OFFSET(xtty, nul_chk_table);
 806     LOG_OFFSET(xtty, oops);
 807     LOG_OFFSET(xtty, metadata);
 808 
 809     xtty->method(method());
 810     xtty->stamp();
 811     xtty->end_elem();
 812   }
 813 }
 814 
 815 #undef LOG_OFFSET
 816 
 817 
 818 // Print out more verbose output usually for a newly created nmethod.
 819 void nmethod::print_on(outputStream* st, const char* msg) const {
 820   if (st != NULL) {
 821     ttyLocker ttyl;
 822     if (WizardMode) {
 823       CompileTask::print(st, this, msg, /*short_form:*/ true);
 824       st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
 825     } else {
 826       CompileTask::print(st, this, msg, /*short_form:*/ false);
 827     }
 828   }
 829 }
 830 
 831 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
 832   bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
 833   if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
 834     print_nmethod(printnmethods);
 835   }
 836 }
 837 
 838 void nmethod::print_nmethod(bool printmethod) {
 839   ttyLocker ttyl;  // keep the following output all in one block
 840   if (xtty != NULL) {
 841     xtty->begin_head("print_nmethod");
 842     xtty->stamp();
 843     xtty->end_head();
 844   }
 845   // print the header part first
 846   print();
 847   // then print the requested information
 848   if (printmethod) {
 849     print_code();
 850     print_pcs();
 851     if (oop_maps()) {
 852       oop_maps()->print();
 853     }
 854   }
 855   if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
 856     print_scopes();
 857   }
 858   if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
 859     print_relocations();
 860   }
 861   if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
 862     print_dependencies();
 863   }
 864   if (printmethod || PrintExceptionHandlers) {
 865     print_handler_table();
 866     print_nul_chk_table();
 867   }
 868   if (printmethod) {
 869     print_recorded_oops();
 870     print_recorded_metadata();
 871   }
 872   if (xtty != NULL) {
 873     xtty->tail("print_nmethod");
 874   }
 875 }
 876 
 877 
 878 // Promote one word from an assembly-time handle to a live embedded oop.
 879 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
 880   if (handle == NULL ||
 881       // As a special case, IC oops are initialized to 1 or -1.
 882       handle == (jobject) Universe::non_oop_word()) {
 883     (*dest) = (oop) handle;
 884   } else {
 885     (*dest) = JNIHandles::resolve_non_null(handle);
 886   }
 887 }
 888 
 889 
 890 // Have to have the same name because it's called by a template
 891 void nmethod::copy_values(GrowableArray<jobject>* array) {
 892   int length = array->length();
 893   assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
 894   oop* dest = oops_begin();
 895   for (int index = 0 ; index < length; index++) {
 896     initialize_immediate_oop(&dest[index], array->at(index));
 897   }
 898 
 899   // Now we can fix up all the oops in the code.  We need to do this
 900   // in the code because the assembler uses jobjects as placeholders.
 901   // The code and relocations have already been initialized by the
 902   // CodeBlob constructor, so it is valid even at this early point to
 903   // iterate over relocations and patch the code.
 904   fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
 905 }
 906 
 907 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
 908   int length = array->length();
 909   assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
 910   Metadata** dest = metadata_begin();
 911   for (int index = 0 ; index < length; index++) {
 912     dest[index] = array->at(index);
 913   }
 914 }
 915 
 916 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
 917   // re-patch all oop-bearing instructions, just in case some oops moved
 918   RelocIterator iter(this, begin, end);
 919   while (iter.next()) {
 920     if (iter.type() == relocInfo::oop_type) {
 921       oop_Relocation* reloc = iter.oop_reloc();
 922       if (initialize_immediates && reloc->oop_is_immediate()) {
 923         oop* dest = reloc->oop_addr();
 924         initialize_immediate_oop(dest, (jobject) *dest);
 925       }
 926       // Refresh the oop-related bits of this instruction.
 927       reloc->fix_oop_relocation();
 928     } else if (iter.type() == relocInfo::metadata_type) {
 929       metadata_Relocation* reloc = iter.metadata_reloc();
 930       reloc->fix_metadata_relocation();
 931     }
 932   }
 933 }
 934 
 935 
 936 void nmethod::verify_clean_inline_caches() {
 937   assert_locked_or_safepoint(CompiledIC_lock);
 938 
 939   // If the method is not entrant or zombie then a JMP is plastered over the
 940   // first few bytes.  If an oop in the old code was there, that oop
 941   // should not get GC'd.  Skip the first few bytes of oops on
 942   // not-entrant methods.
 943   address low_boundary = verified_entry_point();
 944   if (!is_in_use()) {
 945     low_boundary += NativeJump::instruction_size;
 946     // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
 947     // This means that the low_boundary is going to be a little too high.
 948     // This shouldn't matter, since oops of non-entrant methods are never used.
 949     // In fact, why are we bothering to look at oops in a non-entrant method??
 950   }
 951 
 952   ResourceMark rm;
 953   RelocIterator iter(this, low_boundary);
 954   while(iter.next()) {
 955     switch(iter.type()) {
 956       case relocInfo::virtual_call_type:
 957       case relocInfo::opt_virtual_call_type: {
 958         CompiledIC *ic = CompiledIC_at(&iter);
 959         // Ok, to lookup references to zombies here
 960         CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
 961         nmethod* nm = cb->as_nmethod_or_null();
 962         if( nm != NULL ) {
 963           // Verify that inline caches pointing to both zombie and not_entrant methods are clean
 964           if (!nm->is_in_use() || (nm->method()->code() != nm)) {
 965             assert(ic->is_clean(), "IC should be clean");
 966           }
 967         }
 968         break;
 969       }
 970       case relocInfo::static_call_type: {
 971         CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
 972         CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
 973         nmethod* nm = cb->as_nmethod_or_null();
 974         if( nm != NULL ) {
 975           // Verify that inline caches pointing to both zombie and not_entrant methods are clean
 976           if (!nm->is_in_use() || (nm->method()->code() != nm)) {
 977             assert(csc->is_clean(), "IC should be clean");
 978           }
 979         }
 980         break;
 981       }
 982       default:
 983         break;
 984     }
 985   }
 986 }
 987 
 988 // This is a private interface with the sweeper.
 989 void nmethod::mark_as_seen_on_stack() {
 990   assert(is_alive(), "Must be an alive method");
 991   // Set the traversal mark to ensure that the sweeper does 2
 992   // cleaning passes before moving to zombie.
 993   set_stack_traversal_mark(NMethodSweeper::traversal_count());
 994 }
 995 
 996 // Tell if a non-entrant method can be converted to a zombie (i.e.,
 997 // there are no activations on the stack, not in use by the VM,
 998 // and not in use by the ServiceThread)
 999 bool nmethod::can_convert_to_zombie() {
1000   assert(is_not_entrant(), "must be a non-entrant method");
1001 
1002   // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1003   // count can be greater than the stack traversal count before it hits the
1004   // nmethod for the second time.
1005   return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1006          !is_locked_by_vm();
1007 }
1008 
1009 void nmethod::inc_decompile_count() {
1010   if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1011   // Could be gated by ProfileTraps, but do not bother...
1012   Method* m = method();
1013   if (m == NULL)  return;
1014   MethodData* mdo = m->method_data();
1015   if (mdo == NULL)  return;
1016   // There is a benign race here.  See comments in methodData.hpp.
1017   mdo->inc_decompile_count();
1018 }
1019 
1020 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1021 
1022   post_compiled_method_unload();
1023 
1024   // Since this nmethod is being unloaded, make sure that dependencies
1025   // recorded in instanceKlasses get flushed and pass non-NULL closure to
1026   // indicate that this work is being done during a GC.
1027   assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1028   assert(is_alive != NULL, "Should be non-NULL");
1029   // A non-NULL is_alive closure indicates that this is being called during GC.
1030   flush_dependencies(is_alive);
1031 
1032   // Break cycle between nmethod & method
1033   LogTarget(Trace, class, unload) lt;
1034   if (lt.is_enabled()) {
1035     LogStream ls(lt);
1036     ls.print_cr("making nmethod " INTPTR_FORMAT
1037                   " unloadable, Method*(" INTPTR_FORMAT
1038                   "), cause(" INTPTR_FORMAT ")",
1039                   p2i(this), p2i(_method), p2i(cause));
1040     if (!Universe::heap()->is_gc_active())
1041       cause->klass()->print_on(&ls);
1042   }
1043   // Unlink the osr method, so we do not look this up again
1044   if (is_osr_method()) {
1045     // Invalidate the osr nmethod only once
1046     if (is_in_use()) {
1047       invalidate_osr_method();
1048     }
1049 #ifdef ASSERT
1050     if (method() != NULL) {
1051       // Make sure osr nmethod is invalidated, i.e. not on the list
1052       bool found = method()->method_holder()->remove_osr_nmethod(this);
1053       assert(!found, "osr nmethod should have been invalidated");
1054     }
1055 #endif
1056   }
1057 
1058   // If _method is already NULL the Method* is about to be unloaded,
1059   // so we don't have to break the cycle. Note that it is possible to
1060   // have the Method* live here, in case we unload the nmethod because
1061   // it is pointing to some oop (other than the Method*) being unloaded.
1062   if (_method != NULL) {
1063     // OSR methods point to the Method*, but the Method* does not
1064     // point back!
1065     if (_method->code() == this) {
1066       _method->clear_code(); // Break a cycle
1067     }
1068     _method = NULL;            // Clear the method of this dead nmethod
1069   }
1070 
1071   // Make the class unloaded - i.e., change state and notify sweeper
1072   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1073   if (is_in_use()) {
1074     // Transitioning directly from live to unloaded -- so
1075     // we need to force a cache clean-up; remember this
1076     // for later on.
1077     CodeCache::set_needs_cache_clean(true);
1078   }
1079 
1080   // Unregister must be done before the state change
1081   Universe::heap()->unregister_nmethod(this);
1082 
1083   _state = unloaded;
1084 
1085   // Log the unloading.
1086   log_state_change();
1087 
1088 #if INCLUDE_JVMCI
1089   // The method can only be unloaded after the pointer to the installed code
1090   // Java wrapper is no longer alive. Here we need to clear out this weak
1091   // reference to the dead object. Nulling out the reference has to happen
1092   // after the method is unregistered since the original value may be still
1093   // tracked by the rset.
1094   maybe_invalidate_installed_code();
1095   // Clear these out after the nmethod has been unregistered and any
1096   // updates to the InstalledCode instance have been performed.
1097   _jvmci_installed_code = NULL;
1098   _speculation_log = NULL;
1099 #endif
1100 
1101   // The Method* is gone at this point
1102   assert(_method == NULL, "Tautology");
1103 
1104   set_osr_link(NULL);
1105   NMethodSweeper::report_state_change(this);
1106 }
1107 
1108 void nmethod::invalidate_osr_method() {
1109   assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1110   // Remove from list of active nmethods
1111   if (method() != NULL) {
1112     method()->method_holder()->remove_osr_nmethod(this);
1113   }
1114 }
1115 
1116 void nmethod::log_state_change() const {
1117   if (LogCompilation) {
1118     if (xtty != NULL) {
1119       ttyLocker ttyl;  // keep the following output all in one block
1120       if (_state == unloaded) {
1121         xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1122                          os::current_thread_id());
1123       } else {
1124         xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1125                          os::current_thread_id(),
1126                          (_state == zombie ? " zombie='1'" : ""));
1127       }
1128       log_identity(xtty);
1129       xtty->stamp();
1130       xtty->end_elem();
1131     }
1132   }
1133 
1134   const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1135   CompileTask::print_ul(this, state_msg);
1136   if (PrintCompilation && _state != unloaded) {
1137     print_on(tty, state_msg);
1138   }
1139 }
1140 
1141 /**
1142  * Common functionality for both make_not_entrant and make_zombie
1143  */
1144 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1145   assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1146   assert(!is_zombie(), "should not already be a zombie");
1147 
1148   if (_state == state) {
1149     // Avoid taking the lock if already in required state.
1150     // This is safe from races because the state is an end-state,
1151     // which the nmethod cannot back out of once entered.
1152     // No need for fencing either.
1153     return false;
1154   }
1155 
1156   // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1157   nmethodLocker nml(this);
1158   methodHandle the_method(method());
1159   NoSafepointVerifier nsv;
1160 
1161   // during patching, depending on the nmethod state we must notify the GC that
1162   // code has been unloaded, unregistering it. We cannot do this right while
1163   // holding the Patching_lock because we need to use the CodeCache_lock. This
1164   // would be prone to deadlocks.
1165   // This flag is used to remember whether we need to later lock and unregister.
1166   bool nmethod_needs_unregister = false;
1167 
1168   {
1169     // invalidate osr nmethod before acquiring the patching lock since
1170     // they both acquire leaf locks and we don't want a deadlock.
1171     // This logic is equivalent to the logic below for patching the
1172     // verified entry point of regular methods. We check that the
1173     // nmethod is in use to ensure that it is invalidated only once.
1174     if (is_osr_method() && is_in_use()) {
1175       // this effectively makes the osr nmethod not entrant
1176       invalidate_osr_method();
1177     }
1178 
1179     // Enter critical section.  Does not block for safepoint.
1180     MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1181 
1182     if (_state == state) {
1183       // another thread already performed this transition so nothing
1184       // to do, but return false to indicate this.
1185       return false;
1186     }
1187 
1188     // The caller can be calling the method statically or through an inline
1189     // cache call.
1190     if (!is_osr_method() && !is_not_entrant()) {
1191       NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1192                   SharedRuntime::get_handle_wrong_method_stub());
1193     }
1194 
1195     if (is_in_use() && update_recompile_counts()) {
1196       // It's a true state change, so mark the method as decompiled.
1197       // Do it only for transition from alive.
1198       inc_decompile_count();
1199     }
1200 
1201     // If the state is becoming a zombie, signal to unregister the nmethod with
1202     // the heap.
1203     // This nmethod may have already been unloaded during a full GC.
1204     if ((state == zombie) && !is_unloaded()) {
1205       nmethod_needs_unregister = true;
1206     }
1207 
1208     // Must happen before state change. Otherwise we have a race condition in
1209     // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1210     // transition its state from 'not_entrant' to 'zombie' without having to wait
1211     // for stack scanning.
1212     if (state == not_entrant) {
1213       mark_as_seen_on_stack();
1214       OrderAccess::storestore(); // _stack_traversal_mark and _state
1215     }
1216 
1217     // Change state
1218     _state = state;
1219 
1220     // Log the transition once
1221     log_state_change();
1222 
1223     // Invalidate while holding the patching lock
1224     JVMCI_ONLY(maybe_invalidate_installed_code());
1225 
1226     // Remove nmethod from method.
1227     // We need to check if both the _code and _from_compiled_code_entry_point
1228     // refer to this nmethod because there is a race in setting these two fields
1229     // in Method* as seen in bugid 4947125.
1230     // If the vep() points to the zombie nmethod, the memory for the nmethod
1231     // could be flushed and the compiler and vtable stubs could still call
1232     // through it.
1233     if (method() != NULL && (method()->code() == this ||
1234                              method()->from_compiled_entry() == verified_entry_point())) {
1235       HandleMark hm;
1236       method()->clear_code(false /* already owns Patching_lock */);
1237     }
1238   } // leave critical region under Patching_lock
1239 
1240 #ifdef ASSERT
1241   if (is_osr_method() && method() != NULL) {
1242     // Make sure osr nmethod is invalidated, i.e. not on the list
1243     bool found = method()->method_holder()->remove_osr_nmethod(this);
1244     assert(!found, "osr nmethod should have been invalidated");
1245   }
1246 #endif
1247 
1248   // When the nmethod becomes zombie it is no longer alive so the
1249   // dependencies must be flushed.  nmethods in the not_entrant
1250   // state will be flushed later when the transition to zombie
1251   // happens or they get unloaded.
1252   if (state == zombie) {
1253     {
1254       // Flushing dependencies must be done before any possible
1255       // safepoint can sneak in, otherwise the oops used by the
1256       // dependency logic could have become stale.
1257       MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1258       if (nmethod_needs_unregister) {
1259         Universe::heap()->unregister_nmethod(this);
1260 #ifdef JVMCI
1261         _jvmci_installed_code = NULL;
1262         _speculation_log = NULL;
1263 #endif
1264       }
1265       flush_dependencies(NULL);
1266     }
1267 
1268     // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1269     // event and it hasn't already been reported for this nmethod then
1270     // report it now. The event may have been reported earlier if the GC
1271     // marked it for unloading). JvmtiDeferredEventQueue support means
1272     // we no longer go to a safepoint here.
1273     post_compiled_method_unload();
1274 
1275 #ifdef ASSERT
1276     // It's no longer safe to access the oops section since zombie
1277     // nmethods aren't scanned for GC.
1278     _oops_are_stale = true;
1279 #endif
1280      // the Method may be reclaimed by class unloading now that the
1281      // nmethod is in zombie state
1282     set_method(NULL);
1283   } else {
1284     assert(state == not_entrant, "other cases may need to be handled differently");
1285   }
1286 
1287   if (TraceCreateZombies) {
1288     ResourceMark m;
1289     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");
1290   }
1291 
1292   NMethodSweeper::report_state_change(this);
1293   return true;
1294 }
1295 
1296 void nmethod::flush() {
1297   // Note that there are no valid oops in the nmethod anymore.
1298   assert(!is_osr_method() || is_unloaded() || is_zombie(),
1299          "osr nmethod must be unloaded or zombie before flushing");
1300   assert(is_zombie() || is_osr_method(), "must be a zombie method");
1301   assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1302   assert_locked_or_safepoint(CodeCache_lock);
1303 
1304   // completely deallocate this method
1305   Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1306   if (PrintMethodFlushing) {
1307     tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1308                   "/Free CodeCache:" SIZE_FORMAT "Kb",
1309                   is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1310                   CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1311   }
1312 
1313   // We need to deallocate any ExceptionCache data.
1314   // Note that we do not need to grab the nmethod lock for this, it
1315   // better be thread safe if we're disposing of it!
1316   ExceptionCache* ec = exception_cache();
1317   set_exception_cache(NULL);
1318   while(ec != NULL) {
1319     ExceptionCache* next = ec->next();
1320     delete ec;
1321     ec = next;
1322   }
1323 
1324   if (on_scavenge_root_list()) {
1325     CodeCache::drop_scavenge_root_nmethod(this);
1326   }
1327 
1328 #ifdef SHARK
1329   ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1330 #endif // SHARK
1331 
1332   CodeBlob::flush();
1333   CodeCache::free(this);
1334 }
1335 
1336 //
1337 // Notify all classes this nmethod is dependent on that it is no
1338 // longer dependent. This should only be called in two situations.
1339 // First, when a nmethod transitions to a zombie all dependents need
1340 // to be clear.  Since zombification happens at a safepoint there's no
1341 // synchronization issues.  The second place is a little more tricky.
1342 // During phase 1 of mark sweep class unloading may happen and as a
1343 // result some nmethods may get unloaded.  In this case the flushing
1344 // of dependencies must happen during phase 1 since after GC any
1345 // dependencies in the unloaded nmethod won't be updated, so
1346 // traversing the dependency information in unsafe.  In that case this
1347 // function is called with a non-NULL argument and this function only
1348 // notifies instanceKlasses that are reachable
1349 
1350 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1351   assert_locked_or_safepoint(CodeCache_lock);
1352   assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1353   "is_alive is non-NULL if and only if we are called during GC");
1354   if (!has_flushed_dependencies()) {
1355     set_has_flushed_dependencies();
1356     for (Dependencies::DepStream deps(this); deps.next(); ) {
1357       if (deps.type() == Dependencies::call_site_target_value) {
1358         // CallSite dependencies are managed on per-CallSite instance basis.
1359         oop call_site = deps.argument_oop(0);
1360         MethodHandles::remove_dependent_nmethod(call_site, this);
1361       } else {
1362         Klass* klass = deps.context_type();
1363         if (klass == NULL) {
1364           continue;  // ignore things like evol_method
1365         }
1366         // During GC the is_alive closure is non-NULL, and is used to
1367         // determine liveness of dependees that need to be updated.
1368         if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1369           // The GC defers deletion of this entry, since there might be multiple threads
1370           // iterating over the _dependencies graph. Other call paths are single-threaded
1371           // and may delete it immediately.
1372           bool delete_immediately = is_alive == NULL;
1373           InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1374         }
1375       }
1376     }
1377   }
1378 }
1379 
1380 
1381 // If this oop is not live, the nmethod can be unloaded.
1382 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1383   assert(root != NULL, "just checking");
1384   oop obj = *root;
1385   if (obj == NULL || is_alive->do_object_b(obj)) {
1386       return false;
1387   }
1388 
1389   // If ScavengeRootsInCode is true, an nmethod might be unloaded
1390   // simply because one of its constant oops has gone dead.
1391   // No actual classes need to be unloaded in order for this to occur.
1392   assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1393   make_unloaded(is_alive, obj);
1394   return true;
1395 }
1396 
1397 // ------------------------------------------------------------------
1398 // post_compiled_method_load_event
1399 // new method for install_code() path
1400 // Transfer information from compilation to jvmti
1401 void nmethod::post_compiled_method_load_event() {
1402 
1403   Method* moop = method();
1404   HOTSPOT_COMPILED_METHOD_LOAD(
1405       (char *) moop->klass_name()->bytes(),
1406       moop->klass_name()->utf8_length(),
1407       (char *) moop->name()->bytes(),
1408       moop->name()->utf8_length(),
1409       (char *) moop->signature()->bytes(),
1410       moop->signature()->utf8_length(),
1411       insts_begin(), insts_size());
1412 
1413   if (JvmtiExport::should_post_compiled_method_load() ||
1414       JvmtiExport::should_post_compiled_method_unload()) {
1415     get_and_cache_jmethod_id();
1416   }
1417 
1418   if (JvmtiExport::should_post_compiled_method_load()) {
1419     // Let the Service thread (which is a real Java thread) post the event
1420     MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1421     JvmtiDeferredEventQueue::enqueue(
1422       JvmtiDeferredEvent::compiled_method_load_event(this));
1423   }
1424 }
1425 
1426 jmethodID nmethod::get_and_cache_jmethod_id() {
1427   if (_jmethod_id == NULL) {
1428     // Cache the jmethod_id since it can no longer be looked up once the
1429     // method itself has been marked for unloading.
1430     _jmethod_id = method()->jmethod_id();
1431   }
1432   return _jmethod_id;
1433 }
1434 
1435 void nmethod::post_compiled_method_unload() {
1436   if (unload_reported()) {
1437     // During unloading we transition to unloaded and then to zombie
1438     // and the unloading is reported during the first transition.
1439     return;
1440   }
1441 
1442   assert(_method != NULL && !is_unloaded(), "just checking");
1443   DTRACE_METHOD_UNLOAD_PROBE(method());
1444 
1445   // If a JVMTI agent has enabled the CompiledMethodUnload event then
1446   // post the event. Sometime later this nmethod will be made a zombie
1447   // by the sweeper but the Method* will not be valid at that point.
1448   // If the _jmethod_id is null then no load event was ever requested
1449   // so don't bother posting the unload.  The main reason for this is
1450   // that the jmethodID is a weak reference to the Method* so if
1451   // it's being unloaded there's no way to look it up since the weak
1452   // ref will have been cleared.
1453   if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1454     assert(!unload_reported(), "already unloaded");
1455     JvmtiDeferredEvent event =
1456       JvmtiDeferredEvent::compiled_method_unload_event(this,
1457           _jmethod_id, insts_begin());
1458     MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1459     JvmtiDeferredEventQueue::enqueue(event);
1460   }
1461 
1462   // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1463   // any time. As the nmethod is being unloaded now we mark it has
1464   // having the unload event reported - this will ensure that we don't
1465   // attempt to report the event in the unlikely scenario where the
1466   // event is enabled at the time the nmethod is made a zombie.
1467   set_unload_reported();
1468 }
1469 
1470 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1471   assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1472 
1473   oop_Relocation* r = iter_at_oop->oop_reloc();
1474   // Traverse those oops directly embedded in the code.
1475   // Other oops (oop_index>0) are seen as part of scopes_oops.
1476   assert(1 == (r->oop_is_immediate()) +
1477          (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1478          "oop must be found in exactly one place");
1479   if (r->oop_is_immediate() && r->oop_value() != NULL) {
1480     // Unload this nmethod if the oop is dead.
1481     if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1482       return true;;
1483     }
1484   }
1485 
1486   return false;
1487 }
1488 
1489 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1490   // Scopes
1491   for (oop* p = oops_begin(); p < oops_end(); p++) {
1492     if (*p == Universe::non_oop_word())  continue;  // skip non-oops
1493     if (can_unload(is_alive, p, unloading_occurred)) {
1494       return true;
1495     }
1496   }
1497   return false;
1498 }
1499 
1500 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1501   // Compiled code
1502   {
1503   RelocIterator iter(this, low_boundary);
1504   while (iter.next()) {
1505     if (iter.type() == relocInfo::oop_type) {
1506       if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1507         return true;
1508       }
1509     }
1510   }
1511   }
1512 
1513   return do_unloading_scopes(is_alive, unloading_occurred);
1514 }
1515 
1516 #if INCLUDE_JVMCI
1517 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1518   bool is_unloaded = false;
1519   // Follow JVMCI method
1520   BarrierSet* bs = Universe::heap()->barrier_set();
1521   if (_jvmci_installed_code != NULL) {
1522     if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1523       if (!is_alive->do_object_b(_jvmci_installed_code)) {
1524         clear_jvmci_installed_code();
1525       }
1526     } else {
1527       if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1528         return true;
1529       }
1530     }
1531   }
1532 
1533   if (_speculation_log != NULL) {
1534     if (!is_alive->do_object_b(_speculation_log)) {
1535       bs->write_ref_nmethod_pre(&_speculation_log, this);
1536       _speculation_log = NULL;
1537       bs->write_ref_nmethod_post(&_speculation_log, this);
1538     }
1539   }
1540   return is_unloaded;
1541 }
1542 #endif
1543 
1544 // Iterate over metadata calling this function.   Used by RedefineClasses
1545 void nmethod::metadata_do(void f(Metadata*)) {
1546   address low_boundary = verified_entry_point();
1547   if (is_not_entrant()) {
1548     low_boundary += NativeJump::instruction_size;
1549     // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
1550     // (See comment above.)
1551   }
1552   {
1553     // Visit all immediate references that are embedded in the instruction stream.
1554     RelocIterator iter(this, low_boundary);
1555     while (iter.next()) {
1556       if (iter.type() == relocInfo::metadata_type ) {
1557         metadata_Relocation* r = iter.metadata_reloc();
1558         // In this metadata, we must only follow those metadatas directly embedded in
1559         // the code.  Other metadatas (oop_index>0) are seen as part of
1560         // the metadata section below.
1561         assert(1 == (r->metadata_is_immediate()) +
1562                (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1563                "metadata must be found in exactly one place");
1564         if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1565           Metadata* md = r->metadata_value();
1566           if (md != _method) f(md);
1567         }
1568       } else if (iter.type() == relocInfo::virtual_call_type) {
1569         // Check compiledIC holders associated with this nmethod
1570         CompiledIC *ic = CompiledIC_at(&iter);
1571         if (ic->is_icholder_call()) {
1572           CompiledICHolder* cichk = ic->cached_icholder();
1573           f(cichk->holder_method());
1574           f(cichk->holder_klass());
1575         } else {
1576           Metadata* ic_oop = ic->cached_metadata();
1577           if (ic_oop != NULL) {
1578             f(ic_oop);
1579           }
1580         }
1581       }
1582     }
1583   }
1584 
1585   // Visit the metadata section
1586   for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1587     if (*p == Universe::non_oop_word() || *p == NULL)  continue;  // skip non-oops
1588     Metadata* md = *p;
1589     f(md);
1590   }
1591 
1592   // Visit metadata not embedded in the other places.
1593   if (_method != NULL) f(_method);
1594 }
1595 
1596 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1597   // make sure the oops ready to receive visitors
1598   assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1599   assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1600 
1601   // If the method is not entrant or zombie then a JMP is plastered over the
1602   // first few bytes.  If an oop in the old code was there, that oop
1603   // should not get GC'd.  Skip the first few bytes of oops on
1604   // not-entrant methods.
1605   address low_boundary = verified_entry_point();
1606   if (is_not_entrant()) {
1607     low_boundary += NativeJump::instruction_size;
1608     // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
1609     // (See comment above.)
1610   }
1611 
1612 #if INCLUDE_JVMCI
1613   if (_jvmci_installed_code != NULL) {
1614     f->do_oop((oop*) &_jvmci_installed_code);
1615   }
1616   if (_speculation_log != NULL) {
1617     f->do_oop((oop*) &_speculation_log);
1618   }
1619 #endif
1620 
1621   RelocIterator iter(this, low_boundary);
1622 
1623   while (iter.next()) {
1624     if (iter.type() == relocInfo::oop_type ) {
1625       oop_Relocation* r = iter.oop_reloc();
1626       // In this loop, we must only follow those oops directly embedded in
1627       // the code.  Other oops (oop_index>0) are seen as part of scopes_oops.
1628       assert(1 == (r->oop_is_immediate()) +
1629                    (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1630              "oop must be found in exactly one place");
1631       if (r->oop_is_immediate() && r->oop_value() != NULL) {
1632         f->do_oop(r->oop_addr());
1633       }
1634     }
1635   }
1636 
1637   // Scopes
1638   // This includes oop constants not inlined in the code stream.
1639   for (oop* p = oops_begin(); p < oops_end(); p++) {
1640     if (*p == Universe::non_oop_word())  continue;  // skip non-oops
1641     f->do_oop(p);
1642   }
1643 }
1644 
1645 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1646 
1647 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1648 
1649 // An nmethod is "marked" if its _mark_link is set non-null.
1650 // Even if it is the end of the linked list, it will have a non-null link value,
1651 // as long as it is on the list.
1652 // This code must be MP safe, because it is used from parallel GC passes.
1653 bool nmethod::test_set_oops_do_mark() {
1654   assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1655   nmethod* observed_mark_link = _oops_do_mark_link;
1656   if (observed_mark_link == NULL) {
1657     // Claim this nmethod for this thread to mark.
1658     observed_mark_link = (nmethod*)
1659       Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1660     if (observed_mark_link == NULL) {
1661 
1662       // Atomically append this nmethod (now claimed) to the head of the list:
1663       nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1664       for (;;) {
1665         nmethod* required_mark_nmethods = observed_mark_nmethods;
1666         _oops_do_mark_link = required_mark_nmethods;
1667         observed_mark_nmethods = (nmethod*)
1668           Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1669         if (observed_mark_nmethods == required_mark_nmethods)
1670           break;
1671       }
1672       // Mark was clear when we first saw this guy.
1673       if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1674       return false;
1675     }
1676   }
1677   // On fall through, another racing thread marked this nmethod before we did.
1678   return true;
1679 }
1680 
1681 void nmethod::oops_do_marking_prologue() {
1682   if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1683   assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1684   // We use cmpxchg_ptr instead of regular assignment here because the user
1685   // may fork a bunch of threads, and we need them all to see the same state.
1686   void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1687   guarantee(observed == NULL, "no races in this sequential code");
1688 }
1689 
1690 void nmethod::oops_do_marking_epilogue() {
1691   assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1692   nmethod* cur = _oops_do_mark_nmethods;
1693   while (cur != NMETHOD_SENTINEL) {
1694     assert(cur != NULL, "not NULL-terminated");
1695     nmethod* next = cur->_oops_do_mark_link;
1696     cur->_oops_do_mark_link = NULL;
1697     DEBUG_ONLY(cur->verify_oop_relocations());
1698     NOT_PRODUCT(if (TraceScavenge)  cur->print_on(tty, "oops_do, unmark"));
1699     cur = next;
1700   }
1701   void* required = _oops_do_mark_nmethods;
1702   void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1703   guarantee(observed == required, "no races in this sequential code");
1704   if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1705 }
1706 
1707 class DetectScavengeRoot: public OopClosure {
1708   bool     _detected_scavenge_root;
1709 public:
1710   DetectScavengeRoot() : _detected_scavenge_root(false)
1711   { NOT_PRODUCT(_print_nm = NULL); }
1712   bool detected_scavenge_root() { return _detected_scavenge_root; }
1713   virtual void do_oop(oop* p) {
1714     if ((*p) != NULL && (*p)->is_scavengable()) {
1715       NOT_PRODUCT(maybe_print(p));
1716       _detected_scavenge_root = true;
1717     }
1718   }
1719   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1720 
1721 #ifndef PRODUCT
1722   nmethod* _print_nm;
1723   void maybe_print(oop* p) {
1724     if (_print_nm == NULL)  return;
1725     if (!_detected_scavenge_root)  _print_nm->print_on(tty, "new scavenge root");
1726     tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1727                   p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1728                   p2i(*p), p2i(p));
1729     (*p)->print();
1730   }
1731 #endif //PRODUCT
1732 };
1733 
1734 bool nmethod::detect_scavenge_root_oops() {
1735   DetectScavengeRoot detect_scavenge_root;
1736   NOT_PRODUCT(if (TraceScavenge)  detect_scavenge_root._print_nm = this);
1737   oops_do(&detect_scavenge_root);
1738   return detect_scavenge_root.detected_scavenge_root();
1739 }
1740 
1741 inline bool includes(void* p, void* from, void* to) {
1742   return from <= p && p < to;
1743 }
1744 
1745 
1746 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1747   assert(count >= 2, "must be sentinel values, at least");
1748 
1749 #ifdef ASSERT
1750   // must be sorted and unique; we do a binary search in find_pc_desc()
1751   int prev_offset = pcs[0].pc_offset();
1752   assert(prev_offset == PcDesc::lower_offset_limit,
1753          "must start with a sentinel");
1754   for (int i = 1; i < count; i++) {
1755     int this_offset = pcs[i].pc_offset();
1756     assert(this_offset > prev_offset, "offsets must be sorted");
1757     prev_offset = this_offset;
1758   }
1759   assert(prev_offset == PcDesc::upper_offset_limit,
1760          "must end with a sentinel");
1761 #endif //ASSERT
1762 
1763   // Search for MethodHandle invokes and tag the nmethod.
1764   for (int i = 0; i < count; i++) {
1765     if (pcs[i].is_method_handle_invoke()) {
1766       set_has_method_handle_invokes(true);
1767       break;
1768     }
1769   }
1770   assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1771 
1772   int size = count * sizeof(PcDesc);
1773   assert(scopes_pcs_size() >= size, "oob");
1774   memcpy(scopes_pcs_begin(), pcs, size);
1775 
1776   // Adjust the final sentinel downward.
1777   PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1778   assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1779   last_pc->set_pc_offset(content_size() + 1);
1780   for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1781     // Fill any rounding gaps with copies of the last record.
1782     last_pc[1] = last_pc[0];
1783   }
1784   // The following assert could fail if sizeof(PcDesc) is not
1785   // an integral multiple of oopSize (the rounding term).
1786   // If it fails, change the logic to always allocate a multiple
1787   // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1788   assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1789 }
1790 
1791 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1792   assert(scopes_data_size() >= size, "oob");
1793   memcpy(scopes_data_begin(), buffer, size);
1794 }
1795 
1796 #ifdef ASSERT
1797 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1798   PcDesc* lower = search.scopes_pcs_begin();
1799   PcDesc* upper = search.scopes_pcs_end();
1800   lower += 1; // exclude initial sentinel
1801   PcDesc* res = NULL;
1802   for (PcDesc* p = lower; p < upper; p++) {
1803     NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests);  // don't count this call to match_desc
1804     if (match_desc(p, pc_offset, approximate)) {
1805       if (res == NULL)
1806         res = p;
1807       else
1808         res = (PcDesc*) badAddress;
1809     }
1810   }
1811   return res;
1812 }
1813 #endif
1814 
1815 
1816 // Finds a PcDesc with real-pc equal to "pc"
1817 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1818   address base_address = search.code_begin();
1819   if ((pc < base_address) ||
1820       (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1821     return NULL;  // PC is wildly out of range
1822   }
1823   int pc_offset = (int) (pc - base_address);
1824 
1825   // Check the PcDesc cache if it contains the desired PcDesc
1826   // (This as an almost 100% hit rate.)
1827   PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1828   if (res != NULL) {
1829     assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1830     return res;
1831   }
1832 
1833   // Fallback algorithm: quasi-linear search for the PcDesc
1834   // Find the last pc_offset less than the given offset.
1835   // The successor must be the required match, if there is a match at all.
1836   // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1837   PcDesc* lower = search.scopes_pcs_begin();
1838   PcDesc* upper = search.scopes_pcs_end();
1839   upper -= 1; // exclude final sentinel
1840   if (lower >= upper)  return NULL;  // native method; no PcDescs at all
1841 
1842 #define assert_LU_OK \
1843   /* invariant on lower..upper during the following search: */ \
1844   assert(lower->pc_offset() <  pc_offset, "sanity"); \
1845   assert(upper->pc_offset() >= pc_offset, "sanity")
1846   assert_LU_OK;
1847 
1848   // Use the last successful return as a split point.
1849   PcDesc* mid = _pc_desc_cache.last_pc_desc();
1850   NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1851   if (mid->pc_offset() < pc_offset) {
1852     lower = mid;
1853   } else {
1854     upper = mid;
1855   }
1856 
1857   // Take giant steps at first (4096, then 256, then 16, then 1)
1858   const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1859   const int RADIX = (1 << LOG2_RADIX);
1860   for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1861     while ((mid = lower + step) < upper) {
1862       assert_LU_OK;
1863       NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1864       if (mid->pc_offset() < pc_offset) {
1865         lower = mid;
1866       } else {
1867         upper = mid;
1868         break;
1869       }
1870     }
1871     assert_LU_OK;
1872   }
1873 
1874   // Sneak up on the value with a linear search of length ~16.
1875   while (true) {
1876     assert_LU_OK;
1877     mid = lower + 1;
1878     NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1879     if (mid->pc_offset() < pc_offset) {
1880       lower = mid;
1881     } else {
1882       upper = mid;
1883       break;
1884     }
1885   }
1886 #undef assert_LU_OK
1887 
1888   if (match_desc(upper, pc_offset, approximate)) {
1889     assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1890     _pc_desc_cache.add_pc_desc(upper);
1891     return upper;
1892   } else {
1893     assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1894     return NULL;
1895   }
1896 }
1897 
1898 
1899 void nmethod::check_all_dependencies(DepChange& changes) {
1900   // Checked dependencies are allocated into this ResourceMark
1901   ResourceMark rm;
1902 
1903   // Turn off dependency tracing while actually testing dependencies.
1904   NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1905 
1906   typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1907                             &DependencySignature::equals, 11027> DepTable;
1908 
1909   DepTable* table = new DepTable();
1910 
1911   // Iterate over live nmethods and check dependencies of all nmethods that are not
1912   // marked for deoptimization. A particular dependency is only checked once.
1913   NMethodIterator iter;
1914   while(iter.next()) {
1915     nmethod* nm = iter.method();
1916     // Only notify for live nmethods
1917     if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1918       for (Dependencies::DepStream deps(nm); deps.next(); ) {
1919         // Construct abstraction of a dependency.
1920         DependencySignature* current_sig = new DependencySignature(deps);
1921 
1922         // Determine if dependency is already checked. table->put(...) returns
1923         // 'true' if the dependency is added (i.e., was not in the hashtable).
1924         if (table->put(*current_sig, 1)) {
1925           if (deps.check_dependency() != NULL) {
1926             // Dependency checking failed. Print out information about the failed
1927             // dependency and finally fail with an assert. We can fail here, since
1928             // dependency checking is never done in a product build.
1929             tty->print_cr("Failed dependency:");
1930             changes.print();
1931             nm->print();
1932             nm->print_dependencies();
1933             assert(false, "Should have been marked for deoptimization");
1934           }
1935         }
1936       }
1937     }
1938   }
1939 }
1940 
1941 bool nmethod::check_dependency_on(DepChange& changes) {
1942   // What has happened:
1943   // 1) a new class dependee has been added
1944   // 2) dependee and all its super classes have been marked
1945   bool found_check = false;  // set true if we are upset
1946   for (Dependencies::DepStream deps(this); deps.next(); ) {
1947     // Evaluate only relevant dependencies.
1948     if (deps.spot_check_dependency_at(changes) != NULL) {
1949       found_check = true;
1950       NOT_DEBUG(break);
1951     }
1952   }
1953   return found_check;
1954 }
1955 
1956 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1957   InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1958   Array<Method*>* dependee_methods = dependee_ik->methods();
1959   for (Dependencies::DepStream deps(this); deps.next(); ) {
1960     if (deps.type() == Dependencies::evol_method) {
1961       Method* method = deps.method_argument(0);
1962       for (int j = 0; j < dependee_methods->length(); j++) {
1963         if (dependee_methods->at(j) == method) {
1964           if (log_is_enabled(Debug, redefine, class, nmethod)) {
1965             ResourceMark rm;
1966             log_debug(redefine, class, nmethod)
1967               ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1968                _method->method_holder()->external_name(),
1969                _method->name()->as_C_string(),
1970                _method->signature()->as_C_string(),
1971                compile_id(),
1972                method->method_holder()->external_name(),
1973                method->name()->as_C_string(),
1974                method->signature()->as_C_string());
1975           }
1976           if (TraceDependencies || LogCompilation)
1977             deps.log_dependency(dependee);
1978           return true;
1979         }
1980       }
1981     }
1982   }
1983   return false;
1984 }
1985 
1986 // Called from mark_for_deoptimization, when dependee is invalidated.
1987 bool nmethod::is_dependent_on_method(Method* dependee) {
1988   for (Dependencies::DepStream deps(this); deps.next(); ) {
1989     if (deps.type() != Dependencies::evol_method)
1990       continue;
1991     Method* method = deps.method_argument(0);
1992     if (method == dependee) return true;
1993   }
1994   return false;
1995 }
1996 
1997 
1998 bool nmethod::is_patchable_at(address instr_addr) {
1999   assert(insts_contains(instr_addr), "wrong nmethod used");
2000   if (is_zombie()) {
2001     // a zombie may never be patched
2002     return false;
2003   }
2004   return true;
2005 }
2006 
2007 
2008 address nmethod::continuation_for_implicit_exception(address pc) {
2009   // Exception happened outside inline-cache check code => we are inside
2010   // an active nmethod => use cpc to determine a return address
2011   int exception_offset = pc - code_begin();
2012   int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2013 #ifdef ASSERT
2014   if (cont_offset == 0) {
2015     Thread* thread = Thread::current();
2016     ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2017     HandleMark hm(thread);
2018     ResourceMark rm(thread);
2019     CodeBlob* cb = CodeCache::find_blob(pc);
2020     assert(cb != NULL && cb == this, "");
2021     ttyLocker ttyl;
2022     tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2023     print();
2024     method()->print_codes();
2025     print_code();
2026     print_pcs();
2027   }
2028 #endif
2029   if (cont_offset == 0) {
2030     // Let the normal error handling report the exception
2031     return NULL;
2032   }
2033   return code_begin() + cont_offset;
2034 }
2035 
2036 
2037 
2038 void nmethod_init() {
2039   // make sure you didn't forget to adjust the filler fields
2040   assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2041 }
2042 
2043 
2044 //-------------------------------------------------------------------------------------------
2045 
2046 
2047 // QQQ might we make this work from a frame??
2048 nmethodLocker::nmethodLocker(address pc) {
2049   CodeBlob* cb = CodeCache::find_blob(pc);
2050   guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2051   _nm = cb->as_compiled_method();
2052   lock_nmethod(_nm);
2053 }
2054 
2055 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2056 // should pass zombie_ok == true.
2057 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2058   if (cm == NULL)  return;
2059   if (cm->is_aot()) return;  // FIXME: Revisit once _lock_count is added to aot_method
2060   nmethod* nm = cm->as_nmethod();
2061   Atomic::inc(&nm->_lock_count);
2062   assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2063 }
2064 
2065 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2066   if (cm == NULL)  return;
2067   if (cm->is_aot()) return;  // FIXME: Revisit once _lock_count is added to aot_method
2068   nmethod* nm = cm->as_nmethod();
2069   Atomic::dec(&nm->_lock_count);
2070   assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2071 }
2072 
2073 
2074 // -----------------------------------------------------------------------------
2075 // Verification
2076 
2077 class VerifyOopsClosure: public OopClosure {
2078   nmethod* _nm;
2079   bool     _ok;
2080 public:
2081   VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2082   bool ok() { return _ok; }
2083   virtual void do_oop(oop* p) {
2084     if (oopDesc::is_oop_or_null(*p)) return;
2085     if (_ok) {
2086       _nm->print_nmethod(true);
2087       _ok = false;
2088     }
2089     tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2090                   p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2091   }
2092   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2093 };
2094 
2095 void nmethod::verify() {
2096 
2097   // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2098   // seems odd.
2099 
2100   if (is_zombie() || is_not_entrant() || is_unloaded())
2101     return;
2102 
2103   // Make sure all the entry points are correctly aligned for patching.
2104   NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2105 
2106   // assert(oopDesc::is_oop(method()), "must be valid");
2107 
2108   ResourceMark rm;
2109 
2110   if (!CodeCache::contains(this)) {
2111     fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2112   }
2113 
2114   if(is_native_method() )
2115     return;
2116 
2117   nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2118   if (nm != this) {
2119     fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2120   }
2121 
2122   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2123     if (! p->verify(this)) {
2124       tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2125     }
2126   }
2127 
2128   VerifyOopsClosure voc(this);
2129   oops_do(&voc);
2130   assert(voc.ok(), "embedded oops must be OK");
2131   Universe::heap()->verify_nmethod(this);
2132 
2133   verify_scopes();
2134 }
2135 
2136 
2137 void nmethod::verify_interrupt_point(address call_site) {
2138   // Verify IC only when nmethod installation is finished.
2139   bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2140                       || !this->is_in_use();     // nmethod is installed, but not in 'in_use' state
2141   if (is_installed) {
2142     Thread *cur = Thread::current();
2143     if (CompiledIC_lock->owner() == cur ||
2144         ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2145          SafepointSynchronize::is_at_safepoint())) {
2146       CompiledIC_at(this, call_site);
2147       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2148     } else {
2149       MutexLocker ml_verify (CompiledIC_lock);
2150       CompiledIC_at(this, call_site);
2151     }
2152   }
2153 
2154   PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2155   assert(pd != NULL, "PcDesc must exist");
2156   for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2157                                      pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2158                                      pd->return_oop());
2159        !sd->is_top(); sd = sd->sender()) {
2160     sd->verify();
2161   }
2162 }
2163 
2164 void nmethod::verify_scopes() {
2165   if( !method() ) return;       // Runtime stubs have no scope
2166   if (method()->is_native()) return; // Ignore stub methods.
2167   // iterate through all interrupt point
2168   // and verify the debug information is valid.
2169   RelocIterator iter((nmethod*)this);
2170   while (iter.next()) {
2171     address stub = NULL;
2172     switch (iter.type()) {
2173       case relocInfo::virtual_call_type:
2174         verify_interrupt_point(iter.addr());
2175         break;
2176       case relocInfo::opt_virtual_call_type:
2177         stub = iter.opt_virtual_call_reloc()->static_stub(false);
2178         verify_interrupt_point(iter.addr());
2179         break;
2180       case relocInfo::static_call_type:
2181         stub = iter.static_call_reloc()->static_stub(false);
2182         //verify_interrupt_point(iter.addr());
2183         break;
2184       case relocInfo::runtime_call_type:
2185       case relocInfo::runtime_call_w_cp_type: {
2186         address destination = iter.reloc()->value();
2187         // Right now there is no way to find out which entries support
2188         // an interrupt point.  It would be nice if we had this
2189         // information in a table.
2190         break;
2191       }
2192       default:
2193         break;
2194     }
2195     assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2196   }
2197 }
2198 
2199 
2200 // -----------------------------------------------------------------------------
2201 // Non-product code
2202 #ifndef PRODUCT
2203 
2204 class DebugScavengeRoot: public OopClosure {
2205   nmethod* _nm;
2206   bool     _ok;
2207 public:
2208   DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2209   bool ok() { return _ok; }
2210   virtual void do_oop(oop* p) {
2211     if ((*p) == NULL || !(*p)->is_scavengable())  return;
2212     if (_ok) {
2213       _nm->print_nmethod(true);
2214       _ok = false;
2215     }
2216     tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2217                   p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2218     (*p)->print();
2219   }
2220   virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2221 };
2222 
2223 void nmethod::verify_scavenge_root_oops() {
2224   if (!on_scavenge_root_list()) {
2225     // Actually look inside, to verify the claim that it's clean.
2226     DebugScavengeRoot debug_scavenge_root(this);
2227     oops_do(&debug_scavenge_root);
2228     if (!debug_scavenge_root.ok())
2229       fatal("found an unadvertised bad scavengable oop in the code cache");
2230   }
2231   assert(scavenge_root_not_marked(), "");
2232 }
2233 
2234 #endif // PRODUCT
2235 
2236 // Printing operations
2237 
2238 void nmethod::print() const {
2239   ResourceMark rm;
2240   ttyLocker ttyl;   // keep the following output all in one block
2241 
2242   tty->print("Compiled method ");
2243 
2244   if (is_compiled_by_c1()) {
2245     tty->print("(c1) ");
2246   } else if (is_compiled_by_c2()) {
2247     tty->print("(c2) ");
2248   } else if (is_compiled_by_shark()) {
2249     tty->print("(shark) ");
2250   } else if (is_compiled_by_jvmci()) {
2251     tty->print("(JVMCI) ");
2252   } else {
2253     tty->print("(nm) ");
2254   }
2255 
2256   print_on(tty, NULL);
2257 
2258   if (WizardMode) {
2259     tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2260     tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2261     tty->print(" { ");
2262     tty->print_cr("%s ", state());
2263     if (on_scavenge_root_list())  tty->print("scavenge_root ");
2264     tty->print_cr("}:");
2265   }
2266   if (size              () > 0) tty->print_cr(" total in heap  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2267                                               p2i(this),
2268                                               p2i(this) + size(),
2269                                               size());
2270   if (relocation_size   () > 0) tty->print_cr(" relocation     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2271                                               p2i(relocation_begin()),
2272                                               p2i(relocation_end()),
2273                                               relocation_size());
2274   if (consts_size       () > 0) tty->print_cr(" constants      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2275                                               p2i(consts_begin()),
2276                                               p2i(consts_end()),
2277                                               consts_size());
2278   if (insts_size        () > 0) tty->print_cr(" main code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2279                                               p2i(insts_begin()),
2280                                               p2i(insts_end()),
2281                                               insts_size());
2282   if (stub_size         () > 0) tty->print_cr(" stub code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2283                                               p2i(stub_begin()),
2284                                               p2i(stub_end()),
2285                                               stub_size());
2286   if (oops_size         () > 0) tty->print_cr(" oops           [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2287                                               p2i(oops_begin()),
2288                                               p2i(oops_end()),
2289                                               oops_size());
2290   if (metadata_size      () > 0) tty->print_cr(" metadata       [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2291                                               p2i(metadata_begin()),
2292                                               p2i(metadata_end()),
2293                                               metadata_size());
2294   if (scopes_data_size  () > 0) tty->print_cr(" scopes data    [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2295                                               p2i(scopes_data_begin()),
2296                                               p2i(scopes_data_end()),
2297                                               scopes_data_size());
2298   if (scopes_pcs_size   () > 0) tty->print_cr(" scopes pcs     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2299                                               p2i(scopes_pcs_begin()),
2300                                               p2i(scopes_pcs_end()),
2301                                               scopes_pcs_size());
2302   if (dependencies_size () > 0) tty->print_cr(" dependencies   [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2303                                               p2i(dependencies_begin()),
2304                                               p2i(dependencies_end()),
2305                                               dependencies_size());
2306   if (handler_table_size() > 0) tty->print_cr(" handler table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2307                                               p2i(handler_table_begin()),
2308                                               p2i(handler_table_end()),
2309                                               handler_table_size());
2310   if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2311                                               p2i(nul_chk_table_begin()),
2312                                               p2i(nul_chk_table_end()),
2313                                               nul_chk_table_size());
2314 }
2315 
2316 #ifndef PRODUCT
2317 
2318 void nmethod::print_scopes() {
2319   // Find the first pc desc for all scopes in the code and print it.
2320   ResourceMark rm;
2321   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2322     if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2323       continue;
2324 
2325     ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2326     while (sd != NULL) {
2327       sd->print_on(tty, p);
2328       sd = sd->sender();
2329     }
2330   }
2331 }
2332 
2333 void nmethod::print_dependencies() {
2334   ResourceMark rm;
2335   ttyLocker ttyl;   // keep the following output all in one block
2336   tty->print_cr("Dependencies:");
2337   for (Dependencies::DepStream deps(this); deps.next(); ) {
2338     deps.print_dependency();
2339     Klass* ctxk = deps.context_type();
2340     if (ctxk != NULL) {
2341       if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2342         tty->print_cr("   [nmethod<=klass]%s", ctxk->external_name());
2343       }
2344     }
2345     deps.log_dependency();  // put it into the xml log also
2346   }
2347 }
2348 
2349 
2350 void nmethod::print_relocations() {
2351   ResourceMark m;       // in case methods get printed via the debugger
2352   tty->print_cr("relocations:");
2353   RelocIterator iter(this);
2354   iter.print();
2355 }
2356 
2357 
2358 void nmethod::print_pcs() {
2359   ResourceMark m;       // in case methods get printed via debugger
2360   tty->print_cr("pc-bytecode offsets:");
2361   for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2362     p->print(this);
2363   }
2364 }
2365 
2366 void nmethod::print_recorded_oops() {
2367   tty->print_cr("Recorded oops:");
2368   for (int i = 0; i < oops_count(); i++) {
2369     oop o = oop_at(i);
2370     tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2371     if (o == (oop)Universe::non_oop_word()) {
2372       tty->print("non-oop word");
2373     } else {
2374       o->print_value();
2375     }
2376     tty->cr();
2377   }
2378 }
2379 
2380 void nmethod::print_recorded_metadata() {
2381   tty->print_cr("Recorded metadata:");
2382   for (int i = 0; i < metadata_count(); i++) {
2383     Metadata* m = metadata_at(i);
2384     tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2385     if (m == (Metadata*)Universe::non_oop_word()) {
2386       tty->print("non-metadata word");
2387     } else {
2388       m->print_value_on_maybe_null(tty);
2389     }
2390     tty->cr();
2391   }
2392 }
2393 
2394 #endif // PRODUCT
2395 
2396 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2397   RelocIterator iter(this, begin, end);
2398   bool have_one = false;
2399   while (iter.next()) {
2400     have_one = true;
2401     switch (iter.type()) {
2402         case relocInfo::none:                  return "no_reloc";
2403         case relocInfo::oop_type: {
2404           stringStream st;
2405           oop_Relocation* r = iter.oop_reloc();
2406           oop obj = r->oop_value();
2407           st.print("oop(");
2408           if (obj == NULL) st.print("NULL");
2409           else obj->print_value_on(&st);
2410           st.print(")");
2411           return st.as_string();
2412         }
2413         case relocInfo::metadata_type: {
2414           stringStream st;
2415           metadata_Relocation* r = iter.metadata_reloc();
2416           Metadata* obj = r->metadata_value();
2417           st.print("metadata(");
2418           if (obj == NULL) st.print("NULL");
2419           else obj->print_value_on(&st);
2420           st.print(")");
2421           return st.as_string();
2422         }
2423         case relocInfo::runtime_call_type:
2424         case relocInfo::runtime_call_w_cp_type: {
2425           stringStream st;
2426           st.print("runtime_call");
2427           CallRelocation* r = (CallRelocation*)iter.reloc();
2428           address dest = r->destination();
2429           CodeBlob* cb = CodeCache::find_blob(dest);
2430           if (cb != NULL) {
2431             st.print(" %s", cb->name());
2432           } else {
2433             ResourceMark rm;
2434             const int buflen = 1024;
2435             char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2436             int offset;
2437             if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2438               st.print(" %s", buf);
2439               if (offset != 0) {
2440                 st.print("+%d", offset);
2441               }
2442             }
2443           }
2444           return st.as_string();
2445         }
2446         case relocInfo::virtual_call_type: {
2447           stringStream st;
2448           st.print_raw("virtual_call");
2449           virtual_call_Relocation* r = iter.virtual_call_reloc();
2450           Method* m = r->method_value();
2451           if (m != NULL) {
2452             assert(m->is_method(), "");
2453             m->print_short_name(&st);
2454           }
2455           return st.as_string();
2456         }
2457         case relocInfo::opt_virtual_call_type: {
2458           stringStream st;
2459           st.print_raw("optimized virtual_call");
2460           opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2461           Method* m = r->method_value();
2462           if (m != NULL) {
2463             assert(m->is_method(), "");
2464             m->print_short_name(&st);
2465           }
2466           return st.as_string();
2467         }
2468         case relocInfo::static_call_type: {
2469           stringStream st;
2470           st.print_raw("static_call");
2471           static_call_Relocation* r = iter.static_call_reloc();
2472           Method* m = r->method_value();
2473           if (m != NULL) {
2474             assert(m->is_method(), "");
2475             m->print_short_name(&st);
2476           }
2477           return st.as_string();
2478         }
2479         case relocInfo::static_stub_type:      return "static_stub";
2480         case relocInfo::external_word_type:    return "external_word";
2481         case relocInfo::internal_word_type:    return "internal_word";
2482         case relocInfo::section_word_type:     return "section_word";
2483         case relocInfo::poll_type:             return "poll";
2484         case relocInfo::poll_return_type:      return "poll_return";
2485         case relocInfo::type_mask:             return "type_bit_mask";
2486 
2487         default:
2488           break;
2489     }
2490   }
2491   return have_one ? "other" : NULL;
2492 }
2493 
2494 // Return a the last scope in (begin..end]
2495 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2496   PcDesc* p = pc_desc_near(begin+1);
2497   if (p != NULL && p->real_pc(this) <= end) {
2498     return new ScopeDesc(this, p->scope_decode_offset(),
2499                          p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2500                          p->return_oop());
2501   }
2502   return NULL;
2503 }
2504 
2505 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2506   if (block_begin == entry_point())             stream->print_cr("[Entry Point]");
2507   if (block_begin == verified_entry_point())    stream->print_cr("[Verified Entry Point]");
2508   if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin())         stream->print_cr("[Exception Handler]");
2509   if (block_begin == stub_begin())              stream->print_cr("[Stub Code]");
2510   if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin())     stream->print_cr("[Deopt Handler Code]");
2511 
2512   if (has_method_handle_invokes())
2513     if (block_begin == deopt_mh_handler_begin())  stream->print_cr("[Deopt MH Handler Code]");
2514 
2515   if (block_begin == consts_begin())            stream->print_cr("[Constants]");
2516 
2517   if (block_begin == entry_point()) {
2518     methodHandle m = method();
2519     if (m.not_null()) {
2520       stream->print("  # ");
2521       m->print_value_on(stream);
2522       stream->cr();
2523     }
2524     if (m.not_null() && !is_osr_method()) {
2525       ResourceMark rm;
2526       int sizeargs = m->size_of_parameters();
2527       BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2528       VMRegPair* regs   = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2529       {
2530         int sig_index = 0;
2531         if (!m->is_static())
2532           sig_bt[sig_index++] = T_OBJECT; // 'this'
2533         for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2534           BasicType t = ss.type();
2535           sig_bt[sig_index++] = t;
2536           if (type2size[t] == 2) {
2537             sig_bt[sig_index++] = T_VOID;
2538           } else {
2539             assert(type2size[t] == 1, "size is 1 or 2");
2540           }
2541         }
2542         assert(sig_index == sizeargs, "");
2543       }
2544       const char* spname = "sp"; // make arch-specific?
2545       intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2546       int stack_slot_offset = this->frame_size() * wordSize;
2547       int tab1 = 14, tab2 = 24;
2548       int sig_index = 0;
2549       int arg_index = (m->is_static() ? 0 : -1);
2550       bool did_old_sp = false;
2551       for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2552         bool at_this = (arg_index == -1);
2553         bool at_old_sp = false;
2554         BasicType t = (at_this ? T_OBJECT : ss.type());
2555         assert(t == sig_bt[sig_index], "sigs in sync");
2556         if (at_this)
2557           stream->print("  # this: ");
2558         else
2559           stream->print("  # parm%d: ", arg_index);
2560         stream->move_to(tab1);
2561         VMReg fst = regs[sig_index].first();
2562         VMReg snd = regs[sig_index].second();
2563         if (fst->is_reg()) {
2564           stream->print("%s", fst->name());
2565           if (snd->is_valid())  {
2566             stream->print(":%s", snd->name());
2567           }
2568         } else if (fst->is_stack()) {
2569           int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2570           if (offset == stack_slot_offset)  at_old_sp = true;
2571           stream->print("[%s+0x%x]", spname, offset);
2572         } else {
2573           stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2574         }
2575         stream->print(" ");
2576         stream->move_to(tab2);
2577         stream->print("= ");
2578         if (at_this) {
2579           m->method_holder()->print_value_on(stream);
2580         } else {
2581           bool did_name = false;
2582           if (!at_this && ss.is_object()) {
2583             Symbol* name = ss.as_symbol_or_null();
2584             if (name != NULL) {
2585               name->print_value_on(stream);
2586               did_name = true;
2587             }
2588           }
2589           if (!did_name)
2590             stream->print("%s", type2name(t));
2591         }
2592         if (at_old_sp) {
2593           stream->print("  (%s of caller)", spname);
2594           did_old_sp = true;
2595         }
2596         stream->cr();
2597         sig_index += type2size[t];
2598         arg_index += 1;
2599         if (!at_this)  ss.next();
2600       }
2601       if (!did_old_sp) {
2602         stream->print("  # ");
2603         stream->move_to(tab1);
2604         stream->print("[%s+0x%x]", spname, stack_slot_offset);
2605         stream->print("  (%s of caller)", spname);
2606         stream->cr();
2607       }
2608     }
2609   }
2610 }
2611 
2612 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2613   // First, find an oopmap in (begin, end].
2614   // We use the odd half-closed interval so that oop maps and scope descs
2615   // which are tied to the byte after a call are printed with the call itself.
2616   address base = code_begin();
2617   ImmutableOopMapSet* oms = oop_maps();
2618   if (oms != NULL) {
2619     for (int i = 0, imax = oms->count(); i < imax; i++) {
2620       const ImmutableOopMapPair* pair = oms->pair_at(i);
2621       const ImmutableOopMap* om = pair->get_from(oms);
2622       address pc = base + pair->pc_offset();
2623       if (pc > begin) {
2624         if (pc <= end) {
2625           st->move_to(column);
2626           st->print("; ");
2627           om->print_on(st);
2628         }
2629         break;
2630       }
2631     }
2632   }
2633 
2634   // Print any debug info present at this pc.
2635   ScopeDesc* sd  = scope_desc_in(begin, end);
2636   if (sd != NULL) {
2637     st->move_to(column);
2638     if (sd->bci() == SynchronizationEntryBCI) {
2639       st->print(";*synchronization entry");
2640     } else {
2641       if (sd->method() == NULL) {
2642         st->print("method is NULL");
2643       } else if (sd->method()->is_native()) {
2644         st->print("method is native");
2645       } else {
2646         Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2647         st->print(";*%s", Bytecodes::name(bc));
2648         switch (bc) {
2649         case Bytecodes::_invokevirtual:
2650         case Bytecodes::_invokespecial:
2651         case Bytecodes::_invokestatic:
2652         case Bytecodes::_invokeinterface:
2653           {
2654             Bytecode_invoke invoke(sd->method(), sd->bci());
2655             st->print(" ");
2656             if (invoke.name() != NULL)
2657               invoke.name()->print_symbol_on(st);
2658             else
2659               st->print("<UNKNOWN>");
2660             break;
2661           }
2662         case Bytecodes::_getfield:
2663         case Bytecodes::_putfield:
2664         case Bytecodes::_getstatic:
2665         case Bytecodes::_putstatic:
2666           {
2667             Bytecode_field field(sd->method(), sd->bci());
2668             st->print(" ");
2669             if (field.name() != NULL)
2670               field.name()->print_symbol_on(st);
2671             else
2672               st->print("<UNKNOWN>");
2673           }
2674         default:
2675           break;
2676         }
2677       }
2678       st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2679     }
2680 
2681     // Print all scopes
2682     for (;sd != NULL; sd = sd->sender()) {
2683       st->move_to(column);
2684       st->print("; -");
2685       if (sd->method() == NULL) {
2686         st->print("method is NULL");
2687       } else {
2688         sd->method()->print_short_name(st);
2689       }
2690       int lineno = sd->method()->line_number_from_bci(sd->bci());
2691       if (lineno != -1) {
2692         st->print("@%d (line %d)", sd->bci(), lineno);
2693       } else {
2694         st->print("@%d", sd->bci());
2695       }
2696       st->cr();
2697     }
2698   }
2699 
2700   // Print relocation information
2701   const char* str = reloc_string_for(begin, end);
2702   if (str != NULL) {
2703     if (sd != NULL) st->cr();
2704     st->move_to(column);
2705     st->print(";   {%s}", str);
2706   }
2707   int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2708   if (cont_offset != 0) {
2709     st->move_to(column);
2710     st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2711   }
2712 
2713 }
2714 
2715 class DirectNativeCallWrapper: public NativeCallWrapper {
2716 private:
2717   NativeCall* _call;
2718 
2719 public:
2720   DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2721 
2722   virtual address destination() const { return _call->destination(); }
2723   virtual address instruction_address() const { return _call->instruction_address(); }
2724   virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2725   virtual address return_address() const { return _call->return_address(); }
2726 
2727   virtual address get_resolve_call_stub(bool is_optimized) const {
2728     if (is_optimized) {
2729       return SharedRuntime::get_resolve_opt_virtual_call_stub();
2730     }
2731     return SharedRuntime::get_resolve_virtual_call_stub();
2732   }
2733 
2734   virtual void set_destination_mt_safe(address dest) {
2735 #if INCLUDE_AOT
2736     if (UseAOT) {
2737       CodeBlob* callee = CodeCache::find_blob(dest);
2738       CompiledMethod* cm = callee->as_compiled_method_or_null();
2739       if (cm != NULL && cm->is_far_code()) {
2740         // Temporary fix, see JDK-8143106
2741         CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2742         csc->set_to_far(methodHandle(cm->method()), dest);
2743         return;
2744       }
2745     }
2746 #endif
2747     _call->set_destination_mt_safe(dest);
2748   }
2749 
2750   virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2751     CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2752 #if INCLUDE_AOT
2753     if (info.to_aot()) {
2754       csc->set_to_far(method, info.entry());
2755     } else
2756 #endif
2757     {
2758       csc->set_to_interpreted(method, info.entry());
2759     }
2760   }
2761 
2762   virtual void verify() const {
2763     // make sure code pattern is actually a call imm32 instruction
2764     _call->verify();
2765     if (os::is_MP()) {
2766       _call->verify_alignment();
2767     }
2768   }
2769 
2770   virtual void verify_resolve_call(address dest) const {
2771     CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2772     assert(!db->is_adapter_blob(), "must use stub!");
2773   }
2774 
2775   virtual bool is_call_to_interpreted(address dest) const {
2776     CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2777     return cb->contains(dest);
2778   }
2779 
2780   virtual bool is_safe_for_patching() const { return false; }
2781 
2782   virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2783     return nativeMovConstReg_at(r->cached_value());
2784   }
2785 
2786   virtual void *get_data(NativeInstruction* instruction) const {
2787     return (void*)((NativeMovConstReg*) instruction)->data();
2788   }
2789 
2790   virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2791     ((NativeMovConstReg*) instruction)->set_data(data);
2792   }
2793 };
2794 
2795 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2796   return new DirectNativeCallWrapper((NativeCall*) call);
2797 }
2798 
2799 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2800   return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2801 }
2802 
2803 address nmethod::call_instruction_address(address pc) const {
2804   if (NativeCall::is_call_before(pc)) {
2805     NativeCall *ncall = nativeCall_before(pc);
2806     return ncall->instruction_address();
2807   }
2808   return NULL;
2809 }
2810 
2811 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2812   return CompiledDirectStaticCall::at(call_site);
2813 }
2814 
2815 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2816   return CompiledDirectStaticCall::at(call_site);
2817 }
2818 
2819 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2820   return CompiledDirectStaticCall::before(return_addr);
2821 }
2822 
2823 #ifndef PRODUCT
2824 
2825 void nmethod::print_value_on(outputStream* st) const {
2826   st->print("nmethod");
2827   print_on(st, NULL);
2828 }
2829 
2830 void nmethod::print_calls(outputStream* st) {
2831   RelocIterator iter(this);
2832   while (iter.next()) {
2833     switch (iter.type()) {
2834     case relocInfo::virtual_call_type:
2835     case relocInfo::opt_virtual_call_type: {
2836       VerifyMutexLocker mc(CompiledIC_lock);
2837       CompiledIC_at(&iter)->print();
2838       break;
2839     }
2840     case relocInfo::static_call_type:
2841       st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2842       CompiledDirectStaticCall::at(iter.reloc())->print();
2843       break;
2844     default:
2845       break;
2846     }
2847   }
2848 }
2849 
2850 void nmethod::print_handler_table() {
2851   ExceptionHandlerTable(this).print();
2852 }
2853 
2854 void nmethod::print_nul_chk_table() {
2855   ImplicitExceptionTable(this).print(code_begin());
2856 }
2857 
2858 void nmethod::print_statistics() {
2859   ttyLocker ttyl;
2860   if (xtty != NULL)  xtty->head("statistics type='nmethod'");
2861   native_nmethod_stats.print_native_nmethod_stats();
2862 #ifdef COMPILER1
2863   c1_java_nmethod_stats.print_nmethod_stats("C1");
2864 #endif
2865 #ifdef COMPILER2
2866   c2_java_nmethod_stats.print_nmethod_stats("C2");
2867 #endif
2868 #if INCLUDE_JVMCI
2869   jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2870 #endif
2871 #ifdef SHARK
2872   shark_java_nmethod_stats.print_nmethod_stats("Shark");
2873 #endif
2874   unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2875   DebugInformationRecorder::print_statistics();
2876 #ifndef PRODUCT
2877   pc_nmethod_stats.print_pc_stats();
2878 #endif
2879   Dependencies::print_statistics();
2880   if (xtty != NULL)  xtty->tail("statistics");
2881 }
2882 
2883 #endif // !PRODUCT
2884 
2885 #if INCLUDE_JVMCI
2886 void nmethod::clear_jvmci_installed_code() {
2887   // write_ref_method_pre/post can only be safely called at a
2888   // safepoint or while holding the CodeCache_lock
2889   assert(CodeCache_lock->is_locked() ||
2890          SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2891   if (_jvmci_installed_code != NULL) {
2892     // This must be done carefully to maintain nmethod remembered sets properly
2893     BarrierSet* bs = Universe::heap()->barrier_set();
2894     bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2895     _jvmci_installed_code = NULL;
2896     bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2897   }
2898 }
2899 
2900 void nmethod::maybe_invalidate_installed_code() {
2901   assert(Patching_lock->is_locked() ||
2902          SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2903   oop installed_code = jvmci_installed_code();
2904   if (installed_code != NULL) {
2905     nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2906     if (nm == NULL || nm != this) {
2907       // The link has been broken or the InstalledCode instance is
2908       // associated with another nmethod so do nothing.
2909       return;
2910     }
2911     if (!is_alive()) {
2912       // Break the link between nmethod and InstalledCode such that the nmethod
2913       // can subsequently be flushed safely.  The link must be maintained while
2914       // the method could have live activations since invalidateInstalledCode
2915       // might want to invalidate all existing activations.
2916       InstalledCode::set_address(installed_code, 0);
2917       InstalledCode::set_entryPoint(installed_code, 0);
2918     } else if (is_not_entrant()) {
2919       // Remove the entry point so any invocation will fail but keep
2920       // the address link around that so that existing activations can
2921       // be invalidated.
2922       InstalledCode::set_entryPoint(installed_code, 0);
2923     }
2924   }
2925 }
2926 
2927 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2928   if (installedCode() == NULL) {
2929     THROW(vmSymbols::java_lang_NullPointerException());
2930   }
2931   jlong nativeMethod = InstalledCode::address(installedCode);
2932   nmethod* nm = (nmethod*)nativeMethod;
2933   if (nm == NULL) {
2934     // Nothing to do
2935     return;
2936   }
2937 
2938   nmethodLocker nml(nm);
2939 #ifdef ASSERT
2940   {
2941     MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2942     // This relationship can only be checked safely under a lock
2943     assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2944   }
2945 #endif
2946 
2947   if (nm->is_alive()) {
2948     // The nmethod state machinery maintains the link between the
2949     // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2950     // alive assume there is work to do and deoptimize the nmethod.
2951     nm->mark_for_deoptimization();
2952     VM_Deoptimize op;
2953     VMThread::execute(&op);
2954   }
2955 
2956   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2957   // Check that it's still associated with the same nmethod and break
2958   // the link if it is.
2959   if (InstalledCode::address(installedCode) == nativeMethod) {
2960     InstalledCode::set_address(installedCode, 0);
2961   }
2962 }
2963 
2964 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2965   if (!this->is_compiled_by_jvmci()) {
2966     return NULL;
2967   }
2968   oop installedCode = this->jvmci_installed_code();
2969   if (installedCode != NULL) {
2970     oop installedCodeName = NULL;
2971     if (installedCode->is_a(InstalledCode::klass())) {
2972       installedCodeName = InstalledCode::name(installedCode);
2973     }
2974     if (installedCodeName != NULL) {
2975       return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2976     } else {
2977       jio_snprintf(buf, buflen, "null");
2978       return buf;
2979     }
2980   }
2981   jio_snprintf(buf, buflen, "noInstalledCode");
2982   return buf;
2983 }
2984 #endif
--- EOF ---