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 "classfile/metadataOnStackMark.hpp"
  27 #include "classfile/systemDictionary.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "code/debugInfoRec.hpp"
  30 #include "gc/shared/collectedHeap.inline.hpp"
  31 #include "gc/shared/gcLocker.hpp"
  32 #include "gc/shared/generation.hpp"
  33 #include "interpreter/bytecodeStream.hpp"
  34 #include "interpreter/bytecodeTracer.hpp"
  35 #include "interpreter/bytecodes.hpp"
  36 #include "interpreter/interpreter.hpp"
  37 #include "interpreter/oopMapCache.hpp"
  38 #include "memory/heapInspection.hpp"
  39 #include "memory/metadataFactory.hpp"
  40 #include "memory/metaspaceShared.hpp"
  41 #include "memory/oopFactory.hpp"
  42 #include "memory/resourceArea.hpp"
  43 #include "oops/constMethod.hpp"
  44 #include "oops/method.hpp"
  45 #include "oops/methodData.hpp"
  46 #include "oops/objArrayOop.inline.hpp"
  47 #include "oops/oop.inline.hpp"
  48 #include "oops/symbol.hpp"
  49 #include "prims/jvmtiExport.hpp"
  50 #include "prims/methodHandles.hpp"
  51 #include "prims/nativeLookup.hpp"
  52 #include "runtime/arguments.hpp"
  53 #include "runtime/compilationPolicy.hpp"
  54 #include "runtime/frame.inline.hpp"
  55 #include "runtime/handles.inline.hpp"
  56 #include "runtime/init.hpp"
  57 #include "runtime/orderAccess.inline.hpp"
  58 #include "runtime/relocator.hpp"
  59 #include "runtime/sharedRuntime.hpp"
  60 #include "runtime/signature.hpp"
  61 #include "utilities/quickSort.hpp"
  62 #include "utilities/xmlstream.hpp"
  63 
  64 // Implementation of Method
  65 
  66 Method* Method::allocate(ClassLoaderData* loader_data,
  67                          int byte_code_size,
  68                          AccessFlags access_flags,
  69                          InlineTableSizes* sizes,
  70                          ConstMethod::MethodType method_type,
  71                          TRAPS) {
  72   assert(!access_flags.is_native() || byte_code_size == 0,
  73          "native methods should not contain byte codes");
  74   ConstMethod* cm = ConstMethod::allocate(loader_data,
  75                                           byte_code_size,
  76                                           sizes,
  77                                           method_type,
  78                                           CHECK_NULL);
  79   int size = Method::size(access_flags.is_native());
  80   return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
  81 }
  82 
  83 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
  84   NoSafepointVerifier no_safepoint;
  85   set_constMethod(xconst);
  86   set_access_flags(access_flags);
  87   set_intrinsic_id(vmIntrinsics::_none);
  88   set_force_inline(false);
  89   set_hidden(false);
  90   set_dont_inline(false);
  91   set_has_injected_profile(false);
  92   set_method_data(NULL);
  93   clear_method_counters();
  94   set_vtable_index(Method::garbage_vtable_index);
  95 
  96   // Fix and bury in Method*
  97   set_interpreter_entry(NULL); // sets i2i entry and from_int
  98   set_adapter_entry(NULL);
  99   clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
 100 
 101   if (access_flags.is_native()) {
 102     clear_native_function();
 103     set_signature_handler(NULL);
 104   }
 105 
 106   NOT_PRODUCT(set_compiled_invocation_count(0);)
 107 }
 108 
 109 // Release Method*.  The nmethod will be gone when we get here because
 110 // we've walked the code cache.
 111 void Method::deallocate_contents(ClassLoaderData* loader_data) {
 112   MetadataFactory::free_metadata(loader_data, constMethod());
 113   set_constMethod(NULL);
 114   MetadataFactory::free_metadata(loader_data, method_data());
 115   set_method_data(NULL);
 116   MetadataFactory::free_metadata(loader_data, method_counters());
 117   clear_method_counters();
 118   // The nmethod will be gone when we get here.
 119   if (code() != NULL) _code = NULL;
 120 }
 121 
 122 address Method::get_i2c_entry() {
 123   assert(adapter() != NULL, "must have");
 124   return adapter()->get_i2c_entry();
 125 }
 126 
 127 address Method::get_c2i_entry() {
 128   assert(adapter() != NULL, "must have");
 129   return adapter()->get_c2i_entry();
 130 }
 131 
 132 address Method::get_c2i_unverified_entry() {
 133   assert(adapter() != NULL, "must have");
 134   return adapter()->get_c2i_unverified_entry();
 135 }
 136 
 137 char* Method::name_and_sig_as_C_string() const {
 138   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
 139 }
 140 
 141 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
 142   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
 143 }
 144 
 145 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
 146   const char* klass_name = klass->external_name();
 147   int klass_name_len  = (int)strlen(klass_name);
 148   int method_name_len = method_name->utf8_length();
 149   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();
 150   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);
 151   strcpy(dest, klass_name);
 152   dest[klass_name_len] = '.';
 153   strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
 154   strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
 155   dest[len] = 0;
 156   return dest;
 157 }
 158 
 159 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
 160   Symbol* klass_name = klass->name();
 161   klass_name->as_klass_external_name(buf, size);
 162   int len = (int)strlen(buf);
 163 
 164   if (len < size - 1) {
 165     buf[len++] = '.';
 166 
 167     method_name->as_C_string(&(buf[len]), size - len);
 168     len = (int)strlen(buf);
 169 
 170     signature->as_C_string(&(buf[len]), size - len);
 171   }
 172 
 173   return buf;
 174 }
 175 
 176 int Method::fast_exception_handler_bci_for(methodHandle mh, Klass* ex_klass, int throw_bci, TRAPS) {
 177   // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
 178   // access exception table
 179   ExceptionTable table(mh());
 180   int length = table.length();
 181   // iterate through all entries sequentially
 182   constantPoolHandle pool(THREAD, mh->constants());
 183   for (int i = 0; i < length; i ++) {
 184     //reacquire the table in case a GC happened
 185     ExceptionTable table(mh());
 186     int beg_bci = table.start_pc(i);
 187     int end_bci = table.end_pc(i);
 188     assert(beg_bci <= end_bci, "inconsistent exception table");
 189     if (beg_bci <= throw_bci && throw_bci < end_bci) {
 190       // exception handler bci range covers throw_bci => investigate further
 191       int handler_bci = table.handler_pc(i);
 192       int klass_index = table.catch_type_index(i);
 193       if (klass_index == 0) {
 194         return handler_bci;
 195       } else if (ex_klass == NULL) {
 196         return handler_bci;
 197       } else {
 198         // we know the exception class => get the constraint class
 199         // this may require loading of the constraint class; if verification
 200         // fails or some other exception occurs, return handler_bci
 201         Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
 202         assert(k != NULL, "klass not loaded");
 203         if (ex_klass->is_subtype_of(k)) {
 204           return handler_bci;
 205         }
 206       }
 207     }
 208   }
 209 
 210   return -1;
 211 }
 212 
 213 void Method::mask_for(int bci, InterpreterOopMap* mask) {
 214 
 215   Thread* myThread    = Thread::current();
 216   methodHandle h_this(myThread, this);
 217 #if defined(ASSERT) && !INCLUDE_JVMCI
 218   bool has_capability = myThread->is_VM_thread() ||
 219                         myThread->is_ConcurrentGC_thread() ||
 220                         myThread->is_GC_task_thread();
 221 
 222   if (!has_capability) {
 223     if (!VerifyStack && !VerifyLastFrame) {
 224       // verify stack calls this outside VM thread
 225       warning("oopmap should only be accessed by the "
 226               "VM, GC task or CMS threads (or during debugging)");
 227       InterpreterOopMap local_mask;
 228       method_holder()->mask_for(h_this, bci, &local_mask);
 229       local_mask.print();
 230     }
 231   }
 232 #endif
 233   method_holder()->mask_for(h_this, bci, mask);
 234   return;
 235 }
 236 
 237 
 238 int Method::bci_from(address bcp) const {
 239   if (is_native() && bcp == 0) {
 240     return 0;
 241   }
 242 #ifdef ASSERT
 243   {
 244     ResourceMark rm;
 245     assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
 246            "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
 247            p2i(bcp), name_and_sig_as_C_string());
 248   }
 249 #endif
 250   return bcp - code_base();
 251 }
 252 
 253 
 254 int Method::validate_bci(int bci) const {
 255   return (bci == 0 || bci < code_size()) ? bci : -1;
 256 }
 257 
 258 // Return bci if it appears to be a valid bcp
 259 // Return -1 otherwise.
 260 // Used by profiling code, when invalid data is a possibility.
 261 // The caller is responsible for validating the Method* itself.
 262 int Method::validate_bci_from_bcp(address bcp) const {
 263   // keep bci as -1 if not a valid bci
 264   int bci = -1;
 265   if (bcp == 0 || bcp == code_base()) {
 266     // code_size() may return 0 and we allow 0 here
 267     // the method may be native
 268     bci = 0;
 269   } else if (contains(bcp)) {
 270     bci = bcp - code_base();
 271   }
 272   // Assert that if we have dodged any asserts, bci is negative.
 273   assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
 274   return bci;
 275 }
 276 
 277 address Method::bcp_from(int bci) const {
 278   assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
 279          "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
 280   address bcp = code_base() + bci;
 281   assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
 282   return bcp;
 283 }
 284 
 285 address Method::bcp_from(address bcp) const {
 286   if (is_native() && bcp == NULL) {
 287     return code_base();
 288   } else {
 289     return bcp;
 290   }
 291 }
 292 
 293 int Method::size(bool is_native) {
 294   // If native, then include pointers for native_function and signature_handler
 295   int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
 296   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
 297   return align_metadata_size(header_size() + extra_words);
 298 }
 299 
 300 
 301 Symbol* Method::klass_name() const {
 302   return method_holder()->name();
 303 }
 304 
 305 
 306 // Attempt to return method oop to original state.  Clear any pointers
 307 // (to objects outside the shared spaces).  We won't be able to predict
 308 // where they should point in a new JVM.  Further initialize some
 309 // entries now in order allow them to be write protected later.
 310 
 311 void Method::remove_unshareable_info() {
 312   unlink_method();
 313 }
 314 
 315 void Method::set_vtable_index(int index) {
 316   if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
 317     // At runtime initialize_vtable is rerun as part of link_class_impl()
 318     // for a shared class loaded by the non-boot loader to obtain the loader
 319     // constraints based on the runtime classloaders' context.
 320     return; // don't write into the shared class
 321   } else {
 322     _vtable_index = index;
 323   }
 324 }
 325 
 326 void Method::set_itable_index(int index) {
 327   if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
 328     // At runtime initialize_itable is rerun as part of link_class_impl()
 329     // for a shared class loaded by the non-boot loader to obtain the loader
 330     // constraints based on the runtime classloaders' context. The dumptime
 331     // itable index should be the same as the runtime index.
 332     assert(_vtable_index == itable_index_max - index,
 333            "archived itable index is different from runtime index");
 334     return; // don’t write into the shared class
 335   } else {
 336     _vtable_index = itable_index_max - index;
 337   }
 338   assert(valid_itable_index(), "");
 339 }
 340 
 341 
 342 
 343 bool Method::was_executed_more_than(int n) {
 344   // Invocation counter is reset when the Method* is compiled.
 345   // If the method has compiled code we therefore assume it has
 346   // be excuted more than n times.
 347   if (is_accessor() || is_empty_method() || (code() != NULL)) {
 348     // interpreter doesn't bump invocation counter of trivial methods
 349     // compiler does not bump invocation counter of compiled methods
 350     return true;
 351   }
 352   else if ((method_counters() != NULL &&
 353             method_counters()->invocation_counter()->carry()) ||
 354            (method_data() != NULL &&
 355             method_data()->invocation_counter()->carry())) {
 356     // The carry bit is set when the counter overflows and causes
 357     // a compilation to occur.  We don't know how many times
 358     // the counter has been reset, so we simply assume it has
 359     // been executed more than n times.
 360     return true;
 361   } else {
 362     return invocation_count() > n;
 363   }
 364 }
 365 
 366 void Method::print_invocation_count() {
 367   if (is_static()) tty->print("static ");
 368   if (is_final()) tty->print("final ");
 369   if (is_synchronized()) tty->print("synchronized ");
 370   if (is_native()) tty->print("native ");
 371   tty->print("%s::", method_holder()->external_name());
 372   name()->print_symbol_on(tty);
 373   signature()->print_symbol_on(tty);
 374 
 375   if (WizardMode) {
 376     // dump the size of the byte codes
 377     tty->print(" {%d}", code_size());
 378   }
 379   tty->cr();
 380 
 381   tty->print_cr ("  interpreter_invocation_count: %8d ", interpreter_invocation_count());
 382   tty->print_cr ("  invocation_counter:           %8d ", invocation_count());
 383   tty->print_cr ("  backedge_counter:             %8d ", backedge_count());
 384 #ifndef PRODUCT
 385   if (CountCompiledCalls) {
 386     tty->print_cr ("  compiled_invocation_count: %8d ", compiled_invocation_count());
 387   }
 388 #endif
 389 }
 390 
 391 // Build a MethodData* object to hold information about this method
 392 // collected in the interpreter.
 393 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
 394   // Do not profile the method if metaspace has hit an OOM previously
 395   // allocating profiling data. Callers clear pending exception so don't
 396   // add one here.
 397   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 398     return;
 399   }
 400 
 401   // Grab a lock here to prevent multiple
 402   // MethodData*s from being created.
 403   MutexLocker ml(MethodData_lock, THREAD);
 404   if (method->method_data() == NULL) {
 405     ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
 406     MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
 407     if (HAS_PENDING_EXCEPTION) {
 408       CompileBroker::log_metaspace_failure();
 409       ClassLoaderDataGraph::set_metaspace_oom(true);
 410       return;   // return the exception (which is cleared)
 411     }
 412 
 413     method->set_method_data(method_data);
 414     if (PrintMethodData && (Verbose || WizardMode)) {
 415       ResourceMark rm(THREAD);
 416       tty->print("build_interpreter_method_data for ");
 417       method->print_name(tty);
 418       tty->cr();
 419       // At the end of the run, the MDO, full of data, will be dumped.
 420     }
 421   }
 422 }
 423 
 424 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
 425   // Do not profile the method if metaspace has hit an OOM previously
 426   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 427     return NULL;
 428   }
 429 
 430   methodHandle mh(m);
 431   MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
 432   if (HAS_PENDING_EXCEPTION) {
 433     CompileBroker::log_metaspace_failure();
 434     ClassLoaderDataGraph::set_metaspace_oom(true);
 435     return NULL;   // return the exception (which is cleared)
 436   }
 437   if (!mh->init_method_counters(counters)) {
 438     MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
 439   }
 440 
 441   if (LogTouchedMethods) {
 442     mh->log_touched(CHECK_NULL);
 443   }
 444 
 445   return mh->method_counters();
 446 }
 447 
 448 void Method::cleanup_inline_caches() {
 449   // The current system doesn't use inline caches in the interpreter
 450   // => nothing to do (keep this method around for future use)
 451 }
 452 
 453 
 454 int Method::extra_stack_words() {
 455   // not an inline function, to avoid a header dependency on Interpreter
 456   return extra_stack_entries() * Interpreter::stackElementSize;
 457 }
 458 
 459 
 460 void Method::compute_size_of_parameters(Thread *thread) {
 461   ArgumentSizeComputer asc(signature());
 462   set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
 463 }
 464 
 465 BasicType Method::result_type() const {
 466   ResultTypeFinder rtf(signature());
 467   return rtf.type();
 468 }
 469 
 470 
 471 bool Method::is_empty_method() const {
 472   return  code_size() == 1
 473       && *code_base() == Bytecodes::_return;
 474 }
 475 
 476 
 477 bool Method::is_vanilla_constructor() const {
 478   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
 479   // which only calls the superclass vanilla constructor and possibly does stores of
 480   // zero constants to local fields:
 481   //
 482   //   aload_0
 483   //   invokespecial
 484   //   indexbyte1
 485   //   indexbyte2
 486   //
 487   // followed by an (optional) sequence of:
 488   //
 489   //   aload_0
 490   //   aconst_null / iconst_0 / fconst_0 / dconst_0
 491   //   putfield
 492   //   indexbyte1
 493   //   indexbyte2
 494   //
 495   // followed by:
 496   //
 497   //   return
 498 
 499   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
 500   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
 501   int size = code_size();
 502   // Check if size match
 503   if (size == 0 || size % 5 != 0) return false;
 504   address cb = code_base();
 505   int last = size - 1;
 506   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
 507     // Does not call superclass default constructor
 508     return false;
 509   }
 510   // Check optional sequence
 511   for (int i = 4; i < last; i += 5) {
 512     if (cb[i] != Bytecodes::_aload_0) return false;
 513     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
 514     if (cb[i+2] != Bytecodes::_putfield) return false;
 515   }
 516   return true;
 517 }
 518 
 519 
 520 bool Method::compute_has_loops_flag() {
 521   BytecodeStream bcs(this);
 522   Bytecodes::Code bc;
 523 
 524   while ((bc = bcs.next()) >= 0) {
 525     switch( bc ) {
 526       case Bytecodes::_ifeq:
 527       case Bytecodes::_ifnull:
 528       case Bytecodes::_iflt:
 529       case Bytecodes::_ifle:
 530       case Bytecodes::_ifne:
 531       case Bytecodes::_ifnonnull:
 532       case Bytecodes::_ifgt:
 533       case Bytecodes::_ifge:
 534       case Bytecodes::_if_icmpeq:
 535       case Bytecodes::_if_icmpne:
 536       case Bytecodes::_if_icmplt:
 537       case Bytecodes::_if_icmpgt:
 538       case Bytecodes::_if_icmple:
 539       case Bytecodes::_if_icmpge:
 540       case Bytecodes::_if_acmpeq:
 541       case Bytecodes::_if_acmpne:
 542       case Bytecodes::_goto:
 543       case Bytecodes::_jsr:
 544         if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
 545         break;
 546 
 547       case Bytecodes::_goto_w:
 548       case Bytecodes::_jsr_w:
 549         if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
 550         break;
 551     }
 552   }
 553   _access_flags.set_loops_flag_init();
 554   return _access_flags.has_loops();
 555 }
 556 
 557 bool Method::is_final_method(AccessFlags class_access_flags) const {
 558   // or "does_not_require_vtable_entry"
 559   // default method or overpass can occur, is not final (reuses vtable entry)
 560   // private methods in classes get vtable entries for backward class compatibility.
 561   if (is_overpass() || is_default_method())  return false;
 562   return is_final() || class_access_flags.is_final();
 563 }
 564 
 565 bool Method::is_final_method() const {
 566   return is_final_method(method_holder()->access_flags());
 567 }
 568 
 569 bool Method::is_default_method() const {
 570   if (method_holder() != NULL &&
 571       method_holder()->is_interface() &&
 572       !is_abstract() && !is_private()) {
 573     return true;
 574   } else {
 575     return false;
 576   }
 577 }
 578 
 579 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
 580   if (is_final_method(class_access_flags))  return true;
 581 #ifdef ASSERT
 582   ResourceMark rm;
 583   bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
 584   if (class_access_flags.is_interface()) {
 585       assert(is_nonv == is_static() || is_nonv == is_private(),
 586              "nonvirtual unexpected for non-static, non-private: %s",
 587              name_and_sig_as_C_string());
 588   }
 589 #endif
 590   assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
 591   return vtable_index() == nonvirtual_vtable_index;
 592 }
 593 
 594 bool Method::can_be_statically_bound() const {
 595   return can_be_statically_bound(method_holder()->access_flags());
 596 }
 597 
 598 bool Method::is_accessor() const {
 599   return is_getter() || is_setter();
 600 }
 601 
 602 bool Method::is_getter() const {
 603   if (code_size() != 5) return false;
 604   if (size_of_parameters() != 1) return false;
 605   if (java_code_at(0) != Bytecodes::_aload_0)  return false;
 606   if (java_code_at(1) != Bytecodes::_getfield) return false;
 607   switch (java_code_at(4)) {
 608     case Bytecodes::_ireturn:
 609     case Bytecodes::_lreturn:
 610     case Bytecodes::_freturn:
 611     case Bytecodes::_dreturn:
 612     case Bytecodes::_areturn:
 613       break;
 614     default:
 615       return false;
 616   }
 617   return true;
 618 }
 619 
 620 bool Method::is_setter() const {
 621   if (code_size() != 6) return false;
 622   if (java_code_at(0) != Bytecodes::_aload_0) return false;
 623   switch (java_code_at(1)) {
 624     case Bytecodes::_iload_1:
 625     case Bytecodes::_aload_1:
 626     case Bytecodes::_fload_1:
 627       if (size_of_parameters() != 2) return false;
 628       break;
 629     case Bytecodes::_dload_1:
 630     case Bytecodes::_lload_1:
 631       if (size_of_parameters() != 3) return false;
 632       break;
 633     default:
 634       return false;
 635   }
 636   if (java_code_at(2) != Bytecodes::_putfield) return false;
 637   if (java_code_at(5) != Bytecodes::_return)   return false;
 638   return true;
 639 }
 640 
 641 bool Method::is_constant_getter() const {
 642   int last_index = code_size() - 1;
 643   // Check if the first 1-3 bytecodes are a constant push
 644   // and the last bytecode is a return.
 645   return (2 <= code_size() && code_size() <= 4 &&
 646           Bytecodes::is_const(java_code_at(0)) &&
 647           Bytecodes::length_for(java_code_at(0)) == last_index &&
 648           Bytecodes::is_return(java_code_at(last_index)));
 649 }
 650 
 651 bool Method::is_initializer() const {
 652   return is_object_initializer() || is_static_initializer();
 653 }
 654 
 655 bool Method::has_valid_initializer_flags() const {
 656   return (is_static() ||
 657           method_holder()->major_version() < 51);
 658 }
 659 
 660 bool Method::is_static_initializer() const {
 661   // For classfiles version 51 or greater, ensure that the clinit method is
 662   // static.  Non-static methods with the name "<clinit>" are not static
 663   // initializers. (older classfiles exempted for backward compatibility)
 664   return name() == vmSymbols::class_initializer_name() &&
 665          has_valid_initializer_flags();
 666 }
 667 
 668 bool Method::is_object_initializer() const {
 669    return name() == vmSymbols::object_initializer_name();
 670 }
 671 
 672 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
 673   int length = method->checked_exceptions_length();
 674   if (length == 0) {  // common case
 675     return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
 676   } else {
 677     methodHandle h_this(THREAD, method);
 678     objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
 679     objArrayHandle mirrors (THREAD, m_oop);
 680     for (int i = 0; i < length; i++) {
 681       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
 682       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
 683       assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
 684       mirrors->obj_at_put(i, k->java_mirror());
 685     }
 686     return mirrors;
 687   }
 688 };
 689 
 690 
 691 int Method::line_number_from_bci(int bci) const {
 692   if (bci == SynchronizationEntryBCI) bci = 0;
 693   assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
 694   int best_bci  =  0;
 695   int best_line = -1;
 696 
 697   if (has_linenumber_table()) {
 698     // The line numbers are a short array of 2-tuples [start_pc, line_number].
 699     // Not necessarily sorted and not necessarily one-to-one.
 700     CompressedLineNumberReadStream stream(compressed_linenumber_table());
 701     while (stream.read_pair()) {
 702       if (stream.bci() == bci) {
 703         // perfect match
 704         return stream.line();
 705       } else {
 706         // update best_bci/line
 707         if (stream.bci() < bci && stream.bci() >= best_bci) {
 708           best_bci  = stream.bci();
 709           best_line = stream.line();
 710         }
 711       }
 712     }
 713   }
 714   return best_line;
 715 }
 716 
 717 
 718 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
 719   if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
 720     Thread *thread = Thread::current();
 721     Symbol* klass_name = constants()->klass_name_at(klass_index);
 722     Handle loader(thread, method_holder()->class_loader());
 723     Handle prot  (thread, method_holder()->protection_domain());
 724     return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
 725   } else {
 726     return true;
 727   }
 728 }
 729 
 730 
 731 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
 732   int klass_index = constants()->klass_ref_index_at(refinfo_index);
 733   if (must_be_resolved) {
 734     // Make sure klass is resolved in constantpool.
 735     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
 736   }
 737   return is_klass_loaded_by_klass_index(klass_index);
 738 }
 739 
 740 
 741 void Method::set_native_function(address function, bool post_event_flag) {
 742   assert(function != NULL, "use clear_native_function to unregister natives");
 743   assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
 744   address* native_function = native_function_addr();
 745 
 746   // We can see racers trying to place the same native function into place. Once
 747   // is plenty.
 748   address current = *native_function;
 749   if (current == function) return;
 750   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
 751       function != NULL) {
 752     // native_method_throw_unsatisfied_link_error_entry() should only
 753     // be passed when post_event_flag is false.
 754     assert(function !=
 755       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 756       "post_event_flag mis-match");
 757 
 758     // post the bind event, and possible change the bind function
 759     JvmtiExport::post_native_method_bind(this, &function);
 760   }
 761   *native_function = function;
 762   // This function can be called more than once. We must make sure that we always
 763   // use the latest registered method -> check if a stub already has been generated.
 764   // If so, we have to make it not_entrant.
 765   CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
 766   if (nm != NULL) {
 767     nm->make_not_entrant();
 768   }
 769 }
 770 
 771 
 772 bool Method::has_native_function() const {
 773   if (is_method_handle_intrinsic())
 774     return false;  // special-cased in SharedRuntime::generate_native_wrapper
 775   address func = native_function();
 776   return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
 777 }
 778 
 779 
 780 void Method::clear_native_function() {
 781   // Note: is_method_handle_intrinsic() is allowed here.
 782   set_native_function(
 783     SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 784     !native_bind_event_is_interesting);
 785   clear_code();
 786 }
 787 
 788 address Method::critical_native_function() {
 789   methodHandle mh(this);
 790   return NativeLookup::lookup_critical_entry(mh);
 791 }
 792 
 793 
 794 void Method::set_signature_handler(address handler) {
 795   address* signature_handler =  signature_handler_addr();
 796   *signature_handler = handler;
 797 }
 798 
 799 
 800 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
 801   if (PrintCompilation && report) {
 802     ttyLocker ttyl;
 803     tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
 804     if (comp_level == CompLevel_all) {
 805       tty->print("all levels ");
 806     } else {
 807       tty->print("levels ");
 808       for (int i = (int)CompLevel_none; i <= comp_level; i++) {
 809         tty->print("%d ", i);
 810       }
 811     }
 812     this->print_short_name(tty);
 813     int size = this->code_size();
 814     if (size > 0) {
 815       tty->print(" (%d bytes)", size);
 816     }
 817     if (reason != NULL) {
 818       tty->print("   %s", reason);
 819     }
 820     tty->cr();
 821   }
 822   if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
 823     ttyLocker ttyl;
 824     xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
 825                      os::current_thread_id(), is_osr, comp_level);
 826     if (reason != NULL) {
 827       xtty->print(" reason=\'%s\'", reason);
 828     }
 829     xtty->method(this);
 830     xtty->stamp();
 831     xtty->end_elem();
 832   }
 833 }
 834 
 835 bool Method::is_always_compilable() const {
 836   // Generated adapters must be compiled
 837   if (is_method_handle_intrinsic() && is_synthetic()) {
 838     assert(!is_not_c1_compilable(), "sanity check");
 839     assert(!is_not_c2_compilable(), "sanity check");
 840     return true;
 841   }
 842 
 843   return false;
 844 }
 845 
 846 bool Method::is_not_compilable(int comp_level) const {
 847   if (number_of_breakpoints() > 0)
 848     return true;
 849   if (is_always_compilable())
 850     return false;
 851   if (comp_level == CompLevel_any)
 852     return is_not_c1_compilable() || is_not_c2_compilable();
 853   if (is_c1_compile(comp_level))
 854     return is_not_c1_compilable();
 855   if (is_c2_compile(comp_level))
 856     return is_not_c2_compilable();
 857   return false;
 858 }
 859 
 860 // call this when compiler finds that this method is not compilable
 861 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
 862   if (is_always_compilable()) {
 863     // Don't mark a method which should be always compilable
 864     return;
 865   }
 866   print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
 867   if (comp_level == CompLevel_all) {
 868     set_not_c1_compilable();
 869     set_not_c2_compilable();
 870   } else {
 871     if (is_c1_compile(comp_level))
 872       set_not_c1_compilable();
 873     if (is_c2_compile(comp_level))
 874       set_not_c2_compilable();
 875   }
 876   CompilationPolicy::policy()->disable_compilation(this);
 877   assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
 878 }
 879 
 880 bool Method::is_not_osr_compilable(int comp_level) const {
 881   if (is_not_compilable(comp_level))
 882     return true;
 883   if (comp_level == CompLevel_any)
 884     return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
 885   if (is_c1_compile(comp_level))
 886     return is_not_c1_osr_compilable();
 887   if (is_c2_compile(comp_level))
 888     return is_not_c2_osr_compilable();
 889   return false;
 890 }
 891 
 892 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
 893   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
 894   if (comp_level == CompLevel_all) {
 895     set_not_c1_osr_compilable();
 896     set_not_c2_osr_compilable();
 897   } else {
 898     if (is_c1_compile(comp_level))
 899       set_not_c1_osr_compilable();
 900     if (is_c2_compile(comp_level))
 901       set_not_c2_osr_compilable();
 902   }
 903   CompilationPolicy::policy()->disable_compilation(this);
 904   assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
 905 }
 906 
 907 // Revert to using the interpreter and clear out the nmethod
 908 void Method::clear_code(bool acquire_lock /* = true */) {
 909   MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
 910   // this may be NULL if c2i adapters have not been made yet
 911   // Only should happen at allocate time.
 912   if (adapter() == NULL) {
 913     _from_compiled_entry    = NULL;
 914   } else {
 915     _from_compiled_entry    = adapter()->get_c2i_entry();
 916   }
 917   OrderAccess::storestore();
 918   _from_interpreted_entry = _i2i_entry;
 919   OrderAccess::storestore();
 920   _code = NULL;
 921 }
 922 
 923 #if INCLUDE_CDS
 924 // Called by class data sharing to remove any entry points (which are not shared)
 925 void Method::unlink_method() {
 926   _code = NULL;
 927 
 928   assert(DumpSharedSpaces, "dump time only");
 929   // Set the values to what they should be at run time. Note that
 930   // this Method can no longer be executed during dump time.
 931   _i2i_entry = Interpreter::entry_for_cds_method(this);
 932   _from_interpreted_entry = _i2i_entry;
 933 
 934   if (is_native()) {
 935     *native_function_addr() = NULL;
 936     set_signature_handler(NULL);
 937   }
 938   NOT_PRODUCT(set_compiled_invocation_count(0);)
 939 
 940   CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
 941   constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
 942   _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
 943   assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
 944 
 945 
 946   // In case of DumpSharedSpaces, _method_data should always be NULL.
 947   assert(_method_data == NULL, "unexpected method data?");
 948 
 949   set_method_data(NULL);
 950   clear_method_counters();
 951 }
 952 #endif
 953 
 954 /****************************************************************************
 955 // The following illustrates how the entries work for CDS shared Methods:
 956 //
 957 // Our goal is to delay writing into a shared Method until it's compiled.
 958 // Hence, we want to determine the initial values for _i2i_entry,
 959 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
 960 //
 961 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
 962 // They also have similar signatures so that they will share the same
 963 // AdapterHandlerEntry.
 964 //
 965 // _adapter_trampoline points to a fixed location in the RW section of
 966 // the CDS archive. This location initially contains a NULL pointer. When the
 967 // first of method A or B is linked, an AdapterHandlerEntry is allocated
 968 // dynamically, and its c2i/i2c entries are generated.
 969 //
 970 // _i2i_entry and _from_interpreted_entry initially points to the same
 971 // (fixed) location in the CODE section of the CDS archive. This contains
 972 // an unconditional branch to the actual entry for "zero_locals", which is
 973 // generated at run time and may be on an arbitrary address. Thus, the
 974 // unconditional branch is also generated at run time to jump to the correct
 975 // address.
 976 //
 977 // Similarly, _from_compiled_entry points to a fixed address in the CODE
 978 // section. This address has enough space for an unconditional branch
 979 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
 980 // initialized, and the address for the actual c2i_entry is known, we emit a
 981 // branch instruction here to branch to the actual c2i_entry.
 982 //
 983 // The effect of the extra branch on the i2i and c2i entries is negligible.
 984 //
 985 // The reason for putting _adapter_trampoline in RO is many shared Methods
 986 // share the same AdapterHandlerEntry, so we can save space in the RW section
 987 // by having the extra indirection.
 988 
 989 
 990 [Method A: RW]
 991   _constMethod ----> [ConstMethod: RO]
 992                        _adapter_trampoline -----------+
 993                                                       |
 994   _i2i_entry              (same value as method B)    |
 995   _from_interpreted_entry (same value as method B)    |
 996   _from_compiled_entry    (same value as method B)    |
 997                                                       |
 998                                                       |
 999 [Method B: RW]                               +--------+
1000   _constMethod ----> [ConstMethod: RO]       |
1001                        _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1002                                                                                  |
1003                                                  +-------------------------------+
1004                                                  |
1005                                                  +----> [AdapterHandlerEntry] (allocated at run time)
1006                                                               _fingerprint
1007                                                               _c2i_entry ---------------------------------+->[c2i entry..]
1008  _i2i_entry  -------------+                                   _i2c_entry ---------------+-> [i2c entry..] |
1009  _from_interpreted_entry  |                                   _c2i_unverified_entry     |                 |
1010          |                |                                                             |                 |
1011          |                |  (_cds_entry_table: CODE)                                   |                 |
1012          |                +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") |                 |
1013          |                |                               (allocated at run time)       |                 |
1014          |                |  ...                           [asm code ...]               |                 |
1015          +-[not compiled]-+  [n]: jmp _entry_table[n]                                   |                 |
1016          |                                                                              |                 |
1017          |                                                                              |                 |
1018          +-[compiled]-------------------------------------------------------------------+                 |
1019                                                                                                           |
1020  _from_compiled_entry------------>  (_c2i_entry_trampoline: CODE)                                         |
1021                                     [jmp c2i_entry] ------------------------------------------------------+
1022 
1023 ***/
1024 
1025 // Called when the method_holder is getting linked. Setup entrypoints so the method
1026 // is ready to be called from interpreter, compiler, and vtables.
1027 void Method::link_method(const methodHandle& h_method, TRAPS) {
1028   // If the code cache is full, we may reenter this function for the
1029   // leftover methods that weren't linked.
1030   if (is_shared()) {
1031     address entry = Interpreter::entry_for_cds_method(h_method);
1032     assert(entry != NULL && entry == _i2i_entry,
1033            "should be correctly set during dump time");
1034     if (adapter() != NULL) {
1035       return;
1036     }
1037     assert(entry == _from_interpreted_entry,
1038            "should be correctly set during dump time");
1039   } else if (_i2i_entry != NULL) {
1040     return;
1041   }
1042   assert( _code == NULL, "nothing compiled yet" );
1043 
1044   // Setup interpreter entrypoint
1045   assert(this == h_method(), "wrong h_method()" );
1046 
1047   if (!is_shared()) {
1048     assert(adapter() == NULL, "init'd to NULL");
1049     address entry = Interpreter::entry_for_method(h_method);
1050     assert(entry != NULL, "interpreter entry must be non-null");
1051     // Sets both _i2i_entry and _from_interpreted_entry
1052     set_interpreter_entry(entry);
1053   }
1054 
1055   // Don't overwrite already registered native entries.
1056   if (is_native() && !has_native_function()) {
1057     set_native_function(
1058       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1059       !native_bind_event_is_interesting);
1060   }
1061 
1062   // Setup compiler entrypoint.  This is made eagerly, so we do not need
1063   // special handling of vtables.  An alternative is to make adapters more
1064   // lazily by calling make_adapter() from from_compiled_entry() for the
1065   // normal calls.  For vtable calls life gets more complicated.  When a
1066   // call-site goes mega-morphic we need adapters in all methods which can be
1067   // called from the vtable.  We need adapters on such methods that get loaded
1068   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
1069   // problem we'll make these lazily later.
1070   (void) make_adapters(h_method, CHECK);
1071 
1072   // ONLY USE the h_method now as make_adapter may have blocked
1073 
1074 }
1075 
1076 address Method::make_adapters(methodHandle mh, TRAPS) {
1077   // Adapters for compiled code are made eagerly here.  They are fairly
1078   // small (generally < 100 bytes) and quick to make (and cached and shared)
1079   // so making them eagerly shouldn't be too expensive.
1080   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1081   if (adapter == NULL ) {
1082     if (!is_init_completed()) {
1083       // Don't throw exceptions during VM initialization because java.lang.* classes
1084       // might not have been initialized, causing problems when constructing the
1085       // Java exception object.
1086       vm_exit_during_initialization("Out of space in CodeCache for adapters");
1087     } else {
1088       THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1089     }
1090   }
1091 
1092   if (mh->is_shared()) {
1093     assert(mh->adapter() == adapter, "must be");
1094     assert(mh->_from_compiled_entry != NULL, "must be");
1095   } else {
1096     mh->set_adapter_entry(adapter);
1097     mh->_from_compiled_entry = adapter->get_c2i_entry();
1098   }
1099   return adapter->get_c2i_entry();
1100 }
1101 
1102 void Method::restore_unshareable_info(TRAPS) {
1103   assert(is_method() && is_valid_method(), "ensure C++ vtable is restored");
1104 
1105   // Since restore_unshareable_info can be called more than once for a method, don't
1106   // redo any work.
1107   if (adapter() == NULL) {
1108     methodHandle mh(THREAD, this);
1109     link_method(mh, CHECK);
1110   }
1111 }
1112 
1113 volatile address Method::from_compiled_entry_no_trampoline() const {
1114   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1115   if (code) {
1116     return code->verified_entry_point();
1117   } else {
1118     return adapter()->get_c2i_entry();
1119   }
1120 }
1121 
1122 // The verified_code_entry() must be called when a invoke is resolved
1123 // on this method.
1124 
1125 // It returns the compiled code entry point, after asserting not null.
1126 // This function is called after potential safepoints so that nmethod
1127 // or adapter that it points to is still live and valid.
1128 // This function must not hit a safepoint!
1129 address Method::verified_code_entry() {
1130   debug_only(NoSafepointVerifier nsv;)
1131   assert(_from_compiled_entry != NULL, "must be set");
1132   return _from_compiled_entry;
1133 }
1134 
1135 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1136 // (could be racing a deopt).
1137 // Not inline to avoid circular ref.
1138 bool Method::check_code() const {
1139   // cached in a register or local.  There's a race on the value of the field.
1140   CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1141   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1142 }
1143 
1144 // Install compiled code.  Instantly it can execute.
1145 void Method::set_code(methodHandle mh, CompiledMethod *code) {
1146   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1147   assert( code, "use clear_code to remove code" );
1148   assert( mh->check_code(), "" );
1149 
1150   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1151 
1152   // These writes must happen in this order, because the interpreter will
1153   // directly jump to from_interpreted_entry which jumps to an i2c adapter
1154   // which jumps to _from_compiled_entry.
1155   mh->_code = code;             // Assign before allowing compiled code to exec
1156 
1157   int comp_level = code->comp_level();
1158   // In theory there could be a race here. In practice it is unlikely
1159   // and not worth worrying about.
1160   if (comp_level > mh->highest_comp_level()) {
1161     mh->set_highest_comp_level(comp_level);
1162   }
1163 
1164   OrderAccess::storestore();
1165 #ifdef SHARK
1166   mh->_from_interpreted_entry = code->insts_begin();
1167 #else //!SHARK
1168   mh->_from_compiled_entry = code->verified_entry_point();
1169   OrderAccess::storestore();
1170   // Instantly compiled code can execute.
1171   if (!mh->is_method_handle_intrinsic())
1172     mh->_from_interpreted_entry = mh->get_i2c_entry();
1173 #endif //!SHARK
1174 }
1175 
1176 
1177 bool Method::is_overridden_in(Klass* k) const {
1178   InstanceKlass* ik = InstanceKlass::cast(k);
1179 
1180   if (ik->is_interface()) return false;
1181 
1182   // If method is an interface, we skip it - except if it
1183   // is a miranda method
1184   if (method_holder()->is_interface()) {
1185     // Check that method is not a miranda method
1186     if (ik->lookup_method(name(), signature()) == NULL) {
1187       // No implementation exist - so miranda method
1188       return false;
1189     }
1190     return true;
1191   }
1192 
1193   assert(ik->is_subclass_of(method_holder()), "should be subklass");
1194   if (!has_vtable_index()) {
1195     return false;
1196   } else {
1197     Method* vt_m = ik->method_at_vtable(vtable_index());
1198     return vt_m != this;
1199   }
1200 }
1201 
1202 
1203 // give advice about whether this Method* should be cached or not
1204 bool Method::should_not_be_cached() const {
1205   if (is_old()) {
1206     // This method has been redefined. It is either EMCP or obsolete
1207     // and we don't want to cache it because that would pin the method
1208     // down and prevent it from being collectible if and when it
1209     // finishes executing.
1210     return true;
1211   }
1212 
1213   // caching this method should be just fine
1214   return false;
1215 }
1216 
1217 
1218 /**
1219  *  Returns true if this is one of the specially treated methods for
1220  *  security related stack walks (like Reflection.getCallerClass).
1221  */
1222 bool Method::is_ignored_by_security_stack_walk() const {
1223   if (intrinsic_id() == vmIntrinsics::_invoke) {
1224     // This is Method.invoke() -- ignore it
1225     return true;
1226   }
1227   if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1228     // This is an auxilary frame -- ignore it
1229     return true;
1230   }
1231   if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1232     // This is an internal adapter frame for method handles -- ignore it
1233     return true;
1234   }
1235   return false;
1236 }
1237 
1238 
1239 // Constant pool structure for invoke methods:
1240 enum {
1241   _imcp_invoke_name = 1,        // utf8: 'invokeExact', etc.
1242   _imcp_invoke_signature,       // utf8: (variable Symbol*)
1243   _imcp_limit
1244 };
1245 
1246 // Test if this method is an MH adapter frame generated by Java code.
1247 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1248 bool Method::is_compiled_lambda_form() const {
1249   return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1250 }
1251 
1252 // Test if this method is an internal MH primitive method.
1253 bool Method::is_method_handle_intrinsic() const {
1254   vmIntrinsics::ID iid = intrinsic_id();
1255   return (MethodHandles::is_signature_polymorphic(iid) &&
1256           MethodHandles::is_signature_polymorphic_intrinsic(iid));
1257 }
1258 
1259 bool Method::has_member_arg() const {
1260   vmIntrinsics::ID iid = intrinsic_id();
1261   return (MethodHandles::is_signature_polymorphic(iid) &&
1262           MethodHandles::has_member_arg(iid));
1263 }
1264 
1265 // Make an instance of a signature-polymorphic internal MH primitive.
1266 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1267                                                          Symbol* signature,
1268                                                          TRAPS) {
1269   ResourceMark rm;
1270   methodHandle empty;
1271 
1272   InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1273   Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1274   assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1275   if (TraceMethodHandles) {
1276     tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1277   }
1278 
1279   // invariant:   cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1280   name->increment_refcount();
1281   signature->increment_refcount();
1282 
1283   int cp_length = _imcp_limit;
1284   ClassLoaderData* loader_data = holder->class_loader_data();
1285   constantPoolHandle cp;
1286   {
1287     ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1288     cp = constantPoolHandle(THREAD, cp_oop);
1289   }
1290   cp->set_pool_holder(holder);
1291   cp->symbol_at_put(_imcp_invoke_name,       name);
1292   cp->symbol_at_put(_imcp_invoke_signature,  signature);
1293   cp->set_has_preresolution();
1294 
1295   // decide on access bits:  public or not?
1296   int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1297   bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1298   if (must_be_static)  flags_bits |= JVM_ACC_STATIC;
1299   assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1300 
1301   methodHandle m;
1302   {
1303     InlineTableSizes sizes;
1304     Method* m_oop = Method::allocate(loader_data, 0,
1305                                      accessFlags_from(flags_bits), &sizes,
1306                                      ConstMethod::NORMAL, CHECK_(empty));
1307     m = methodHandle(THREAD, m_oop);
1308   }
1309   m->set_constants(cp());
1310   m->set_name_index(_imcp_invoke_name);
1311   m->set_signature_index(_imcp_invoke_signature);
1312   assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1313   assert(m->signature() == signature, "");
1314   ResultTypeFinder rtf(signature);
1315   m->constMethod()->set_result_type(rtf.type());
1316   m->compute_size_of_parameters(THREAD);
1317   m->init_intrinsic_id();
1318   assert(m->is_method_handle_intrinsic(), "");
1319 #ifdef ASSERT
1320   if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id()))  m->print();
1321   assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1322   assert(m->intrinsic_id() == iid, "correctly predicted iid");
1323 #endif //ASSERT
1324 
1325   // Finally, set up its entry points.
1326   assert(m->can_be_statically_bound(), "");
1327   m->set_vtable_index(Method::nonvirtual_vtable_index);
1328   m->link_method(m, CHECK_(empty));
1329 
1330   if (TraceMethodHandles && (Verbose || WizardMode)) {
1331     ttyLocker ttyl;
1332     m->print_on(tty);
1333   }
1334 
1335   return m;
1336 }
1337 
1338 Klass* Method::check_non_bcp_klass(Klass* klass) {
1339   if (klass != NULL && klass->class_loader() != NULL) {
1340     if (klass->is_objArray_klass())
1341       klass = ObjArrayKlass::cast(klass)->bottom_klass();
1342     return klass;
1343   }
1344   return NULL;
1345 }
1346 
1347 
1348 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1349                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1350   // Code below does not work for native methods - they should never get rewritten anyway
1351   assert(!m->is_native(), "cannot rewrite native methods");
1352   // Allocate new Method*
1353   AccessFlags flags = m->access_flags();
1354 
1355   ConstMethod* cm = m->constMethod();
1356   int checked_exceptions_len = cm->checked_exceptions_length();
1357   int localvariable_len = cm->localvariable_table_length();
1358   int exception_table_len = cm->exception_table_length();
1359   int method_parameters_len = cm->method_parameters_length();
1360   int method_annotations_len = cm->method_annotations_length();
1361   int parameter_annotations_len = cm->parameter_annotations_length();
1362   int type_annotations_len = cm->type_annotations_length();
1363   int default_annotations_len = cm->default_annotations_length();
1364 
1365   InlineTableSizes sizes(
1366       localvariable_len,
1367       new_compressed_linenumber_size,
1368       exception_table_len,
1369       checked_exceptions_len,
1370       method_parameters_len,
1371       cm->generic_signature_index(),
1372       method_annotations_len,
1373       parameter_annotations_len,
1374       type_annotations_len,
1375       default_annotations_len,
1376       0);
1377 
1378   ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1379   Method* newm_oop = Method::allocate(loader_data,
1380                                       new_code_length,
1381                                       flags,
1382                                       &sizes,
1383                                       m->method_type(),
1384                                       CHECK_(methodHandle()));
1385   methodHandle newm (THREAD, newm_oop);
1386 
1387   // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1388   ConstMethod* newcm = newm->constMethod();
1389   int new_const_method_size = newm->constMethod()->size();
1390 
1391   memcpy(newm(), m(), sizeof(Method));
1392 
1393   // Create shallow copy of ConstMethod.
1394   memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1395 
1396   // Reset correct method/const method, method size, and parameter info
1397   newm->set_constMethod(newcm);
1398   newm->constMethod()->set_code_size(new_code_length);
1399   newm->constMethod()->set_constMethod_size(new_const_method_size);
1400   assert(newm->code_size() == new_code_length, "check");
1401   assert(newm->method_parameters_length() == method_parameters_len, "check");
1402   assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1403   assert(newm->exception_table_length() == exception_table_len, "check");
1404   assert(newm->localvariable_table_length() == localvariable_len, "check");
1405   // Copy new byte codes
1406   memcpy(newm->code_base(), new_code, new_code_length);
1407   // Copy line number table
1408   if (new_compressed_linenumber_size > 0) {
1409     memcpy(newm->compressed_linenumber_table(),
1410            new_compressed_linenumber_table,
1411            new_compressed_linenumber_size);
1412   }
1413   // Copy method_parameters
1414   if (method_parameters_len > 0) {
1415     memcpy(newm->method_parameters_start(),
1416            m->method_parameters_start(),
1417            method_parameters_len * sizeof(MethodParametersElement));
1418   }
1419   // Copy checked_exceptions
1420   if (checked_exceptions_len > 0) {
1421     memcpy(newm->checked_exceptions_start(),
1422            m->checked_exceptions_start(),
1423            checked_exceptions_len * sizeof(CheckedExceptionElement));
1424   }
1425   // Copy exception table
1426   if (exception_table_len > 0) {
1427     memcpy(newm->exception_table_start(),
1428            m->exception_table_start(),
1429            exception_table_len * sizeof(ExceptionTableElement));
1430   }
1431   // Copy local variable number table
1432   if (localvariable_len > 0) {
1433     memcpy(newm->localvariable_table_start(),
1434            m->localvariable_table_start(),
1435            localvariable_len * sizeof(LocalVariableTableElement));
1436   }
1437   // Copy stackmap table
1438   if (m->has_stackmap_table()) {
1439     int code_attribute_length = m->stackmap_data()->length();
1440     Array<u1>* stackmap_data =
1441       MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1442     memcpy((void*)stackmap_data->adr_at(0),
1443            (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1444     newm->set_stackmap_data(stackmap_data);
1445   }
1446 
1447   // copy annotations over to new method
1448   newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1449   return newm;
1450 }
1451 
1452 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1453   // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1454   // because we are not loading from core libraries
1455   // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1456   // which does not use the class default class loader so we check for its loader here
1457   const InstanceKlass* ik = InstanceKlass::cast(holder);
1458   if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1459     return vmSymbols::NO_SID;   // regardless of name, no intrinsics here
1460   }
1461 
1462   // see if the klass name is well-known:
1463   Symbol* klass_name = ik->name();
1464   return vmSymbols::find_sid(klass_name);
1465 }
1466 
1467 void Method::init_intrinsic_id() {
1468   assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1469   const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1470   assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1471   assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1472 
1473   // the klass name is well-known:
1474   vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1475   assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1476 
1477   // ditto for method and signature:
1478   vmSymbols::SID  name_id = vmSymbols::find_sid(name());
1479   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1480       && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1481       && name_id == vmSymbols::NO_SID) {
1482     return;
1483   }
1484   vmSymbols::SID   sig_id = vmSymbols::find_sid(signature());
1485   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1486       && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1487       && sig_id == vmSymbols::NO_SID) {
1488     return;
1489   }
1490   jshort flags = access_flags().as_short();
1491 
1492   vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1493   if (id != vmIntrinsics::_none) {
1494     set_intrinsic_id(id);
1495     if (id == vmIntrinsics::_Class_cast) {
1496       // Even if the intrinsic is rejected, we want to inline this simple method.
1497       set_force_inline(true);
1498     }
1499     return;
1500   }
1501 
1502   // A few slightly irregular cases:
1503   switch (klass_id) {
1504   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1505     // Second chance: check in regular Math.
1506     switch (name_id) {
1507     case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1508     case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1509     case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1510       // pretend it is the corresponding method in the non-strict class:
1511       klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1512       id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1513       break;
1514     }
1515     break;
1516 
1517   // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1518   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1519   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1520     if (!is_native())  break;
1521     id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1522     if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1523       id = vmIntrinsics::_none;
1524     break;
1525   }
1526 
1527   if (id != vmIntrinsics::_none) {
1528     // Set up its iid.  It is an alias method.
1529     set_intrinsic_id(id);
1530     return;
1531   }
1532 }
1533 
1534 // These two methods are static since a GC may move the Method
1535 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1536   if (!THREAD->can_call_java()) {
1537     // There is nothing useful this routine can do from within the Compile thread.
1538     // Hopefully, the signature contains only well-known classes.
1539     // We could scan for this and return true/false, but the caller won't care.
1540     return false;
1541   }
1542   bool sig_is_loaded = true;
1543   Handle class_loader(THREAD, m->method_holder()->class_loader());
1544   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1545   ResourceMark rm(THREAD);
1546   Symbol*  signature = m->signature();
1547   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1548     if (ss.is_object()) {
1549       Symbol* sym = ss.as_symbol(CHECK_(false));
1550       Symbol*  name  = sym;
1551       Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1552                                              protection_domain, THREAD);
1553       // We are loading classes eagerly. If a ClassNotFoundException or
1554       // a LinkageError was generated, be sure to ignore it.
1555       if (HAS_PENDING_EXCEPTION) {
1556         if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1557             PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1558           CLEAR_PENDING_EXCEPTION;
1559         } else {
1560           return false;
1561         }
1562       }
1563       if( klass == NULL) { sig_is_loaded = false; }
1564     }
1565   }
1566   return sig_is_loaded;
1567 }
1568 
1569 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1570   Handle class_loader(THREAD, m->method_holder()->class_loader());
1571   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1572   ResourceMark rm(THREAD);
1573   Symbol*  signature = m->signature();
1574   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1575     if (ss.type() == T_OBJECT) {
1576       Symbol* name = ss.as_symbol_or_null();
1577       if (name == NULL) return true;
1578       Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1579       if (klass == NULL) return true;
1580     }
1581   }
1582   return false;
1583 }
1584 
1585 // Exposed so field engineers can debug VM
1586 void Method::print_short_name(outputStream* st) {
1587   ResourceMark rm;
1588 #ifdef PRODUCT
1589   st->print(" %s::", method_holder()->external_name());
1590 #else
1591   st->print(" %s::", method_holder()->internal_name());
1592 #endif
1593   name()->print_symbol_on(st);
1594   if (WizardMode) signature()->print_symbol_on(st);
1595   else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1596     MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1597 }
1598 
1599 // Comparer for sorting an object array containing
1600 // Method*s.
1601 static int method_comparator(Method* a, Method* b) {
1602   return a->name()->fast_compare(b->name());
1603 }
1604 
1605 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1606 // default_methods also uses this without the ordering for fast find_method
1607 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1608   int length = methods->length();
1609   if (length > 1) {
1610     {
1611       NoSafepointVerifier nsv;
1612       QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1613     }
1614     // Reset method ordering
1615     if (set_idnums) {
1616       for (int i = 0; i < length; i++) {
1617         Method* m = methods->at(i);
1618         m->set_method_idnum(i);
1619         m->set_orig_method_idnum(i);
1620       }
1621     }
1622   }
1623 }
1624 
1625 //-----------------------------------------------------------------------------------
1626 // Non-product code unless JVM/TI needs it
1627 
1628 #if !defined(PRODUCT) || INCLUDE_JVMTI
1629 class SignatureTypePrinter : public SignatureTypeNames {
1630  private:
1631   outputStream* _st;
1632   bool _use_separator;
1633 
1634   void type_name(const char* name) {
1635     if (_use_separator) _st->print(", ");
1636     _st->print("%s", name);
1637     _use_separator = true;
1638   }
1639 
1640  public:
1641   SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1642     _st = st;
1643     _use_separator = false;
1644   }
1645 
1646   void print_parameters()              { _use_separator = false; iterate_parameters(); }
1647   void print_returntype()              { _use_separator = false; iterate_returntype(); }
1648 };
1649 
1650 
1651 void Method::print_name(outputStream* st) {
1652   Thread *thread = Thread::current();
1653   ResourceMark rm(thread);
1654   st->print("%s ", is_static() ? "static" : "virtual");
1655   if (WizardMode) {
1656     st->print("%s.", method_holder()->internal_name());
1657     name()->print_symbol_on(st);
1658     signature()->print_symbol_on(st);
1659   } else {
1660     SignatureTypePrinter sig(signature(), st);
1661     sig.print_returntype();
1662     st->print(" %s.", method_holder()->internal_name());
1663     name()->print_symbol_on(st);
1664     st->print("(");
1665     sig.print_parameters();
1666     st->print(")");
1667   }
1668 }
1669 #endif // !PRODUCT || INCLUDE_JVMTI
1670 
1671 
1672 void Method::print_codes_on(outputStream* st) const {
1673   print_codes_on(0, code_size(), st);
1674 }
1675 
1676 void Method::print_codes_on(int from, int to, outputStream* st) const {
1677   Thread *thread = Thread::current();
1678   ResourceMark rm(thread);
1679   methodHandle mh (thread, (Method*)this);
1680   BytecodeStream s(mh);
1681   s.set_interval(from, to);
1682   BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1683   while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1684 }
1685 
1686 
1687 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1688 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1689 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1690 // as end-of-stream terminator.
1691 
1692 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1693   // bci and line number does not compress into single byte.
1694   // Write out escape character and use regular compression for bci and line number.
1695   write_byte((jubyte)0xFF);
1696   write_signed_int(bci_delta);
1697   write_signed_int(line_delta);
1698 }
1699 
1700 // See comment in method.hpp which explains why this exists.
1701 #if defined(_M_AMD64) && _MSC_VER >= 1400
1702 #pragma optimize("", off)
1703 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1704   write_pair_inline(bci, line);
1705 }
1706 #pragma optimize("", on)
1707 #endif
1708 
1709 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1710   _bci = 0;
1711   _line = 0;
1712 };
1713 
1714 
1715 bool CompressedLineNumberReadStream::read_pair() {
1716   jubyte next = read_byte();
1717   // Check for terminator
1718   if (next == 0) return false;
1719   if (next == 0xFF) {
1720     // Escape character, regular compression used
1721     _bci  += read_signed_int();
1722     _line += read_signed_int();
1723   } else {
1724     // Single byte compression used
1725     _bci  += next >> 3;
1726     _line += next & 0x7;
1727   }
1728   return true;
1729 }
1730 
1731 #if INCLUDE_JVMTI
1732 
1733 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1734   BreakpointInfo* bp = method_holder()->breakpoints();
1735   for (; bp != NULL; bp = bp->next()) {
1736     if (bp->match(this, bci)) {
1737       return bp->orig_bytecode();
1738     }
1739   }
1740   {
1741     ResourceMark rm;
1742     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1743   }
1744   return Bytecodes::_shouldnotreachhere;
1745 }
1746 
1747 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1748   assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1749   BreakpointInfo* bp = method_holder()->breakpoints();
1750   for (; bp != NULL; bp = bp->next()) {
1751     if (bp->match(this, bci)) {
1752       bp->set_orig_bytecode(code);
1753       // and continue, in case there is more than one
1754     }
1755   }
1756 }
1757 
1758 void Method::set_breakpoint(int bci) {
1759   InstanceKlass* ik = method_holder();
1760   BreakpointInfo *bp = new BreakpointInfo(this, bci);
1761   bp->set_next(ik->breakpoints());
1762   ik->set_breakpoints(bp);
1763   // do this last:
1764   bp->set(this);
1765 }
1766 
1767 static void clear_matches(Method* m, int bci) {
1768   InstanceKlass* ik = m->method_holder();
1769   BreakpointInfo* prev_bp = NULL;
1770   BreakpointInfo* next_bp;
1771   for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1772     next_bp = bp->next();
1773     // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1774     if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1775       // do this first:
1776       bp->clear(m);
1777       // unhook it
1778       if (prev_bp != NULL)
1779         prev_bp->set_next(next_bp);
1780       else
1781         ik->set_breakpoints(next_bp);
1782       delete bp;
1783       // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1784       // at same location. So we have multiple matching (method_index and bci)
1785       // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1786       // breakpoint for clear_breakpoint request and keep all other method versions
1787       // BreakpointInfo for future clear_breakpoint request.
1788       // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1789       // which is being called when class is unloaded. We delete all the Breakpoint
1790       // information for all versions of method. We may not correctly restore the original
1791       // bytecode in all method versions, but that is ok. Because the class is being unloaded
1792       // so these methods won't be used anymore.
1793       if (bci >= 0) {
1794         break;
1795       }
1796     } else {
1797       // This one is a keeper.
1798       prev_bp = bp;
1799     }
1800   }
1801 }
1802 
1803 void Method::clear_breakpoint(int bci) {
1804   assert(bci >= 0, "");
1805   clear_matches(this, bci);
1806 }
1807 
1808 void Method::clear_all_breakpoints() {
1809   clear_matches(this, -1);
1810 }
1811 
1812 #endif // INCLUDE_JVMTI
1813 
1814 int Method::invocation_count() {
1815   MethodCounters *mcs = method_counters();
1816   if (TieredCompilation) {
1817     MethodData* const mdo = method_data();
1818     if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1819         ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1820       return InvocationCounter::count_limit;
1821     } else {
1822       return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1823              ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1824     }
1825   } else {
1826     return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1827   }
1828 }
1829 
1830 int Method::backedge_count() {
1831   MethodCounters *mcs = method_counters();
1832   if (TieredCompilation) {
1833     MethodData* const mdo = method_data();
1834     if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1835         ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1836       return InvocationCounter::count_limit;
1837     } else {
1838       return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1839              ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1840     }
1841   } else {
1842     return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1843   }
1844 }
1845 
1846 int Method::highest_comp_level() const {
1847   const MethodCounters* mcs = method_counters();
1848   if (mcs != NULL) {
1849     return mcs->highest_comp_level();
1850   } else {
1851     return CompLevel_none;
1852   }
1853 }
1854 
1855 int Method::highest_osr_comp_level() const {
1856   const MethodCounters* mcs = method_counters();
1857   if (mcs != NULL) {
1858     return mcs->highest_osr_comp_level();
1859   } else {
1860     return CompLevel_none;
1861   }
1862 }
1863 
1864 void Method::set_highest_comp_level(int level) {
1865   MethodCounters* mcs = method_counters();
1866   if (mcs != NULL) {
1867     mcs->set_highest_comp_level(level);
1868   }
1869 }
1870 
1871 void Method::set_highest_osr_comp_level(int level) {
1872   MethodCounters* mcs = method_counters();
1873   if (mcs != NULL) {
1874     mcs->set_highest_osr_comp_level(level);
1875   }
1876 }
1877 
1878 #if INCLUDE_JVMTI
1879 
1880 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1881   _bci = bci;
1882   _name_index = m->name_index();
1883   _signature_index = m->signature_index();
1884   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1885   if (_orig_bytecode == Bytecodes::_breakpoint)
1886     _orig_bytecode = m->orig_bytecode_at(_bci);
1887   _next = NULL;
1888 }
1889 
1890 void BreakpointInfo::set(Method* method) {
1891 #ifdef ASSERT
1892   {
1893     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1894     if (code == Bytecodes::_breakpoint)
1895       code = method->orig_bytecode_at(_bci);
1896     assert(orig_bytecode() == code, "original bytecode must be the same");
1897   }
1898 #endif
1899   Thread *thread = Thread::current();
1900   *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1901   method->incr_number_of_breakpoints(thread);
1902   SystemDictionary::notice_modification();
1903   {
1904     // Deoptimize all dependents on this method
1905     HandleMark hm(thread);
1906     methodHandle mh(thread, method);
1907     CodeCache::flush_dependents_on_method(mh);
1908   }
1909 }
1910 
1911 void BreakpointInfo::clear(Method* method) {
1912   *method->bcp_from(_bci) = orig_bytecode();
1913   assert(method->number_of_breakpoints() > 0, "must not go negative");
1914   method->decr_number_of_breakpoints(Thread::current());
1915 }
1916 
1917 #endif // INCLUDE_JVMTI
1918 
1919 // jmethodID handling
1920 
1921 // This is a block allocating object, sort of like JNIHandleBlock, only a
1922 // lot simpler.
1923 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1924 // never get rid of it.
1925 
1926 static const int min_block_size = 8;
1927 
1928 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1929   friend class JNIMethodBlock;
1930   Method**        _methods;
1931   int             _number_of_methods;
1932   int             _top;
1933   JNIMethodBlockNode* _next;
1934 
1935  public:
1936 
1937   JNIMethodBlockNode(int num_methods = min_block_size);
1938 
1939   ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1940 
1941   void ensure_methods(int num_addl_methods) {
1942     if (_top < _number_of_methods) {
1943       num_addl_methods -= _number_of_methods - _top;
1944       if (num_addl_methods <= 0) {
1945         return;
1946       }
1947     }
1948     if (_next == NULL) {
1949       _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1950     } else {
1951       _next->ensure_methods(num_addl_methods);
1952     }
1953   }
1954 };
1955 
1956 class JNIMethodBlock : public CHeapObj<mtClass> {
1957   JNIMethodBlockNode _head;
1958   JNIMethodBlockNode *_last_free;
1959  public:
1960   static Method* const _free_method;
1961 
1962   JNIMethodBlock(int initial_capacity = min_block_size)
1963       : _head(initial_capacity), _last_free(&_head) {}
1964 
1965   void ensure_methods(int num_addl_methods) {
1966     _last_free->ensure_methods(num_addl_methods);
1967   }
1968 
1969   Method** add_method(Method* m) {
1970     for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1971       if (b->_top < b->_number_of_methods) {
1972         // top points to the next free entry.
1973         int i = b->_top;
1974         b->_methods[i] = m;
1975         b->_top++;
1976         _last_free = b;
1977         return &(b->_methods[i]);
1978       } else if (b->_top == b->_number_of_methods) {
1979         // if the next free entry ran off the block see if there's a free entry
1980         for (int i = 0; i < b->_number_of_methods; i++) {
1981           if (b->_methods[i] == _free_method) {
1982             b->_methods[i] = m;
1983             _last_free = b;
1984             return &(b->_methods[i]);
1985           }
1986         }
1987         // Only check each block once for frees.  They're very unlikely.
1988         // Increment top past the end of the block.
1989         b->_top++;
1990       }
1991       // need to allocate a next block.
1992       if (b->_next == NULL) {
1993         b->_next = _last_free = new JNIMethodBlockNode();
1994       }
1995     }
1996     guarantee(false, "Should always allocate a free block");
1997     return NULL;
1998   }
1999 
2000   bool contains(Method** m) {
2001     if (m == NULL) return false;
2002     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2003       if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2004         // This is a bit of extra checking, for two reasons.  One is
2005         // that contains() deals with pointers that are passed in by
2006         // JNI code, so making sure that the pointer is aligned
2007         // correctly is valuable.  The other is that <= and > are
2008         // technically not defined on pointers, so the if guard can
2009         // pass spuriously; no modern compiler is likely to make that
2010         // a problem, though (and if one did, the guard could also
2011         // fail spuriously, which would be bad).
2012         ptrdiff_t idx = m - b->_methods;
2013         if (b->_methods + idx == m) {
2014           return true;
2015         }
2016       }
2017     }
2018     return false;  // not found
2019   }
2020 
2021   // Doesn't really destroy it, just marks it as free so it can be reused.
2022   void destroy_method(Method** m) {
2023 #ifdef ASSERT
2024     assert(contains(m), "should be a methodID");
2025 #endif // ASSERT
2026     *m = _free_method;
2027   }
2028 
2029   // During class unloading the methods are cleared, which is different
2030   // than freed.
2031   void clear_all_methods() {
2032     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2033       for (int i = 0; i< b->_number_of_methods; i++) {
2034         b->_methods[i] = NULL;
2035       }
2036     }
2037   }
2038 #ifndef PRODUCT
2039   int count_methods() {
2040     // count all allocated methods
2041     int count = 0;
2042     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2043       for (int i = 0; i< b->_number_of_methods; i++) {
2044         if (b->_methods[i] != _free_method) count++;
2045       }
2046     }
2047     return count;
2048   }
2049 #endif // PRODUCT
2050 };
2051 
2052 // Something that can't be mistaken for an address or a markOop
2053 Method* const JNIMethodBlock::_free_method = (Method*)55;
2054 
2055 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2056   _number_of_methods = MAX2(num_methods, min_block_size);
2057   _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2058   for (int i = 0; i < _number_of_methods; i++) {
2059     _methods[i] = JNIMethodBlock::_free_method;
2060   }
2061 }
2062 
2063 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2064   ClassLoaderData* cld = loader_data;
2065   if (!SafepointSynchronize::is_at_safepoint()) {
2066     // Have to add jmethod_ids() to class loader data thread-safely.
2067     // Also have to add the method to the list safely, which the cld lock
2068     // protects as well.
2069     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2070     if (cld->jmethod_ids() == NULL) {
2071       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2072     } else {
2073       cld->jmethod_ids()->ensure_methods(capacity);
2074     }
2075   } else {
2076     // At safepoint, we are single threaded and can set this.
2077     if (cld->jmethod_ids() == NULL) {
2078       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2079     } else {
2080       cld->jmethod_ids()->ensure_methods(capacity);
2081     }
2082   }
2083 }
2084 
2085 // Add a method id to the jmethod_ids
2086 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2087   ClassLoaderData* cld = loader_data;
2088 
2089   if (!SafepointSynchronize::is_at_safepoint()) {
2090     // Have to add jmethod_ids() to class loader data thread-safely.
2091     // Also have to add the method to the list safely, which the cld lock
2092     // protects as well.
2093     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2094     if (cld->jmethod_ids() == NULL) {
2095       cld->set_jmethod_ids(new JNIMethodBlock());
2096     }
2097     // jmethodID is a pointer to Method*
2098     return (jmethodID)cld->jmethod_ids()->add_method(m);
2099   } else {
2100     // At safepoint, we are single threaded and can set this.
2101     if (cld->jmethod_ids() == NULL) {
2102       cld->set_jmethod_ids(new JNIMethodBlock());
2103     }
2104     // jmethodID is a pointer to Method*
2105     return (jmethodID)cld->jmethod_ids()->add_method(m);
2106   }
2107 }
2108 
2109 // Mark a jmethodID as free.  This is called when there is a data race in
2110 // InstanceKlass while creating the jmethodID cache.
2111 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2112   ClassLoaderData* cld = loader_data;
2113   Method** ptr = (Method**)m;
2114   assert(cld->jmethod_ids() != NULL, "should have method handles");
2115   cld->jmethod_ids()->destroy_method(ptr);
2116 }
2117 
2118 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2119   // Can't assert the method_holder is the same because the new method has the
2120   // scratch method holder.
2121   assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2122            == new_method->method_holder()->class_loader(),
2123          "changing to a different class loader");
2124   // Just change the method in place, jmethodID pointer doesn't change.
2125   *((Method**)jmid) = new_method;
2126 }
2127 
2128 bool Method::is_method_id(jmethodID mid) {
2129   Method* m = resolve_jmethod_id(mid);
2130   assert(m != NULL, "should be called with non-null method");
2131   InstanceKlass* ik = m->method_holder();
2132   ClassLoaderData* cld = ik->class_loader_data();
2133   if (cld->jmethod_ids() == NULL) return false;
2134   return (cld->jmethod_ids()->contains((Method**)mid));
2135 }
2136 
2137 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2138   if (mid == NULL) return NULL;
2139   Method* o = resolve_jmethod_id(mid);
2140   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2141     return NULL;
2142   }
2143   return o;
2144 };
2145 
2146 void Method::set_on_stack(const bool value) {
2147   // Set both the method itself and its constant pool.  The constant pool
2148   // on stack means some method referring to it is also on the stack.
2149   constants()->set_on_stack(value);
2150 
2151   bool already_set = on_stack();
2152   _access_flags.set_on_stack(value);
2153   if (value && !already_set) {
2154     MetadataOnStackMark::record(this);
2155   }
2156 }
2157 
2158 // Called when the class loader is unloaded to make all methods weak.
2159 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2160   loader_data->jmethod_ids()->clear_all_methods();
2161 }
2162 
2163 bool Method::has_method_vptr(const void* ptr) {
2164   Method m;
2165   // This assumes that the vtbl pointer is the first word of a C++ object.
2166   return dereference_vptr(&m) == dereference_vptr(ptr);
2167 }
2168 
2169 // Check that this pointer is valid by checking that the vtbl pointer matches
2170 bool Method::is_valid_method() const {
2171   if (this == NULL) {
2172     return false;
2173   } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2174     // Quick sanity check on pointer.
2175     return false;
2176   } else if (MetaspaceShared::is_in_shared_space(this)) {
2177     return MetaspaceShared::is_valid_shared_method(this);
2178   } else if (Metaspace::contains_non_shared(this)) {
2179     return has_method_vptr((const void*)this);
2180   } else {
2181     return false;
2182   }
2183 }
2184 
2185 #ifndef PRODUCT
2186 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2187   out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2188 }
2189 #endif // PRODUCT
2190 
2191 
2192 // Printing
2193 
2194 #ifndef PRODUCT
2195 
2196 void Method::print_on(outputStream* st) const {
2197   ResourceMark rm;
2198   assert(is_method(), "must be method");
2199   st->print_cr("%s", internal_name());
2200   st->print_cr(" - this oop:          " INTPTR_FORMAT, p2i(this));
2201   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
2202   st->print   (" - constants:         " INTPTR_FORMAT " ", p2i(constants()));
2203   constants()->print_value_on(st); st->cr();
2204   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2205   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
2206   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
2207   st->print_cr(" - max stack:         %d",   max_stack());
2208   st->print_cr(" - max locals:        %d",   max_locals());
2209   st->print_cr(" - size of params:    %d",   size_of_parameters());
2210   st->print_cr(" - method size:       %d",   method_size());
2211   if (intrinsic_id() != vmIntrinsics::_none)
2212     st->print_cr(" - intrinsic id:      %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2213   if (highest_comp_level() != CompLevel_none)
2214     st->print_cr(" - highest level:     %d", highest_comp_level());
2215   st->print_cr(" - vtable index:      %d",   _vtable_index);
2216   st->print_cr(" - i2i entry:         " INTPTR_FORMAT, p2i(interpreter_entry()));
2217   st->print(   " - adapters:          ");
2218   AdapterHandlerEntry* a = ((Method*)this)->adapter();
2219   if (a == NULL)
2220     st->print_cr(INTPTR_FORMAT, p2i(a));
2221   else
2222     a->print_adapter_on(st);
2223   st->print_cr(" - compiled entry     " INTPTR_FORMAT, p2i(from_compiled_entry()));
2224   st->print_cr(" - code size:         %d",   code_size());
2225   if (code_size() != 0) {
2226     st->print_cr(" - code start:        " INTPTR_FORMAT, p2i(code_base()));
2227     st->print_cr(" - code end (excl):   " INTPTR_FORMAT, p2i(code_base() + code_size()));
2228   }
2229   if (method_data() != NULL) {
2230     st->print_cr(" - method data:       " INTPTR_FORMAT, p2i(method_data()));
2231   }
2232   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
2233   if (checked_exceptions_length() > 0) {
2234     CheckedExceptionElement* table = checked_exceptions_start();
2235     st->print_cr(" - checked ex start:  " INTPTR_FORMAT, p2i(table));
2236     if (Verbose) {
2237       for (int i = 0; i < checked_exceptions_length(); i++) {
2238         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2239       }
2240     }
2241   }
2242   if (has_linenumber_table()) {
2243     u_char* table = compressed_linenumber_table();
2244     st->print_cr(" - linenumber start:  " INTPTR_FORMAT, p2i(table));
2245     if (Verbose) {
2246       CompressedLineNumberReadStream stream(table);
2247       while (stream.read_pair()) {
2248         st->print_cr("   - line %d: %d", stream.line(), stream.bci());
2249       }
2250     }
2251   }
2252   st->print_cr(" - localvar length:   %d",   localvariable_table_length());
2253   if (localvariable_table_length() > 0) {
2254     LocalVariableTableElement* table = localvariable_table_start();
2255     st->print_cr(" - localvar start:    " INTPTR_FORMAT, p2i(table));
2256     if (Verbose) {
2257       for (int i = 0; i < localvariable_table_length(); i++) {
2258         int bci = table[i].start_bci;
2259         int len = table[i].length;
2260         const char* name = constants()->printable_name_at(table[i].name_cp_index);
2261         const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2262         int slot = table[i].slot;
2263         st->print_cr("   - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2264       }
2265     }
2266   }
2267   if (code() != NULL) {
2268     st->print   (" - compiled code: ");
2269     code()->print_value_on(st);
2270   }
2271   if (is_native()) {
2272     st->print_cr(" - native function:   " INTPTR_FORMAT, p2i(native_function()));
2273     st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2274   }
2275 }
2276 
2277 void Method::print_linkage_flags(outputStream* st) {
2278   access_flags().print_on(st);
2279   if (is_default_method()) {
2280     st->print("default ");
2281   }
2282   if (is_overpass()) {
2283     st->print("overpass ");
2284   }
2285 }
2286 #endif //PRODUCT
2287 
2288 void Method::print_value_on(outputStream* st) const {
2289   assert(is_method(), "must be method");
2290   st->print("%s", internal_name());
2291   print_address_on(st);
2292   st->print(" ");
2293   name()->print_value_on(st);
2294   st->print(" ");
2295   signature()->print_value_on(st);
2296   st->print(" in ");
2297   method_holder()->print_value_on(st);
2298   if (WizardMode) st->print("#%d", _vtable_index);
2299   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2300   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2301 }
2302 
2303 #if INCLUDE_SERVICES
2304 // Size Statistics
2305 void Method::collect_statistics(KlassSizeStats *sz) const {
2306   int mysize = sz->count(this);
2307   sz->_method_bytes += mysize;
2308   sz->_method_all_bytes += mysize;
2309   sz->_rw_bytes += mysize;
2310 
2311   if (constMethod()) {
2312     constMethod()->collect_statistics(sz);
2313   }
2314   if (method_data()) {
2315     method_data()->collect_statistics(sz);
2316   }
2317 }
2318 #endif // INCLUDE_SERVICES
2319 
2320 // LogTouchedMethods and PrintTouchedMethods
2321 
2322 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2323 // the Method may be garbage collected. Let's roll our own hash table.
2324 class TouchedMethodRecord : CHeapObj<mtTracing> {
2325 public:
2326   // It's OK to store Symbols here because they will NOT be GC'ed if
2327   // LogTouchedMethods is enabled.
2328   TouchedMethodRecord* _next;
2329   Symbol* _class_name;
2330   Symbol* _method_name;
2331   Symbol* _method_signature;
2332 };
2333 
2334 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2335 static TouchedMethodRecord** _touched_method_table = NULL;
2336 
2337 void Method::log_touched(TRAPS) {
2338 
2339   const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2340   Symbol* my_class = klass_name();
2341   Symbol* my_name  = name();
2342   Symbol* my_sig   = signature();
2343 
2344   unsigned int hash = my_class->identity_hash() +
2345                       my_name->identity_hash() +
2346                       my_sig->identity_hash();
2347   juint index = juint(hash) % table_size;
2348 
2349   MutexLocker ml(TouchedMethodLog_lock, THREAD);
2350   if (_touched_method_table == NULL) {
2351     _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2352                                               mtTracing, CURRENT_PC);
2353     memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2354   }
2355 
2356   TouchedMethodRecord* ptr = _touched_method_table[index];
2357   while (ptr) {
2358     if (ptr->_class_name       == my_class &&
2359         ptr->_method_name      == my_name &&
2360         ptr->_method_signature == my_sig) {
2361       return;
2362     }
2363     if (ptr->_next == NULL) break;
2364     ptr = ptr->_next;
2365   }
2366   TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2367   my_class->set_permanent();  // prevent reclaimed by GC
2368   my_name->set_permanent();
2369   my_sig->set_permanent();
2370   nptr->_class_name         = my_class;
2371   nptr->_method_name        = my_name;
2372   nptr->_method_signature   = my_sig;
2373   nptr->_next               = NULL;
2374 
2375   if (ptr == NULL) {
2376     // first
2377     _touched_method_table[index] = nptr;
2378   } else {
2379     ptr->_next = nptr;
2380   }
2381 }
2382 
2383 void Method::print_touched_methods(outputStream* out) {
2384   MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2385   out->print_cr("# Method::print_touched_methods version 1");
2386   if (_touched_method_table) {
2387     for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2388       TouchedMethodRecord* ptr = _touched_method_table[i];
2389       while(ptr) {
2390         ptr->_class_name->print_symbol_on(out);       out->print(".");
2391         ptr->_method_name->print_symbol_on(out);      out->print(":");
2392         ptr->_method_signature->print_symbol_on(out); out->cr();
2393         ptr = ptr->_next;
2394       }
2395     }
2396   }
2397 }
2398 
2399 // Verification
2400 
2401 void Method::verify_on(outputStream* st) {
2402   guarantee(is_method(), "object must be method");
2403   guarantee(constants()->is_constantPool(), "should be constant pool");
2404   guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2405   MethodData* md = method_data();
2406   guarantee(md == NULL ||
2407       md->is_methodData(), "should be method data");
2408 }