1 /*
   2  * Copyright (c) 1997, 2015, 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/oopFactory.hpp"
  41 #include "oops/constMethod.hpp"
  42 #include "oops/method.hpp"
  43 #include "oops/methodData.hpp"
  44 #include "oops/oop.inline.hpp"
  45 #include "oops/symbol.hpp"
  46 #include "prims/jvmtiExport.hpp"
  47 #include "prims/methodHandles.hpp"
  48 #include "prims/nativeLookup.hpp"
  49 #include "runtime/arguments.hpp"
  50 #include "runtime/compilationPolicy.hpp"
  51 #include "runtime/frame.inline.hpp"
  52 #include "runtime/handles.inline.hpp"
  53 #include "runtime/orderAccess.inline.hpp"
  54 #include "runtime/relocator.hpp"
  55 #include "runtime/sharedRuntime.hpp"
  56 #include "runtime/signature.hpp"
  57 #include "utilities/quickSort.hpp"
  58 #include "utilities/xmlstream.hpp"
  59 
  60 // Implementation of Method
  61 
  62 Method* Method::allocate(ClassLoaderData* loader_data,
  63                          int byte_code_size,
  64                          AccessFlags access_flags,
  65                          InlineTableSizes* sizes,
  66                          ConstMethod::MethodType method_type,
  67                          TRAPS) {
  68   assert(!access_flags.is_native() || byte_code_size == 0,
  69          "native methods should not contain byte codes");
  70   ConstMethod* cm = ConstMethod::allocate(loader_data,
  71                                           byte_code_size,
  72                                           sizes,
  73                                           method_type,
  74                                           CHECK_NULL);
  75   int size = Method::size(access_flags.is_native());
  76   return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
  77 }
  78 
  79 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
  80   No_Safepoint_Verifier no_safepoint;
  81   set_constMethod(xconst);
  82   set_access_flags(access_flags);
  83 #ifdef CC_INTERP
  84   set_result_index(T_VOID);
  85 #endif
  86   set_intrinsic_id(vmIntrinsics::_none);
  87   set_jfr_towrite(false);
  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(); // 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, KlassHandle 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.is_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         KlassHandle klass = KlassHandle(THREAD, k);
 203         assert(klass.not_null(), "klass not loaded");
 204         if (ex_klass->is_subtype_of(klass())) {
 205           return handler_bci;
 206         }
 207       }
 208     }
 209   }
 210 
 211   return -1;
 212 }
 213 
 214 void Method::mask_for(int bci, InterpreterOopMap* mask) {
 215 
 216   Thread* myThread    = Thread::current();
 217   methodHandle h_this(myThread, this);
 218 #if defined(ASSERT) && !INCLUDE_JVMCI
 219   bool has_capability = myThread->is_VM_thread() ||
 220                         myThread->is_ConcurrentGC_thread() ||
 221                         myThread->is_GC_task_thread();
 222 
 223   if (!has_capability) {
 224     if (!VerifyStack && !VerifyLastFrame) {
 225       // verify stack calls this outside VM thread
 226       warning("oopmap should only be accessed by the "
 227               "VM, GC task or CMS threads (or during debugging)");
 228       InterpreterOopMap local_mask;
 229       method_holder()->mask_for(h_this, bci, &local_mask);
 230       local_mask.print();
 231     }
 232   }
 233 #endif
 234   method_holder()->mask_for(h_this, bci, mask);
 235   return;
 236 }
 237 
 238 
 239 int Method::bci_from(address bcp) const {
 240   if (is_native() && bcp == 0) {
 241     return 0;
 242   }
 243 #ifdef ASSERT
 244   {
 245     ResourceMark rm;
 246     assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
 247            "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
 248            p2i(bcp), name_and_sig_as_C_string());
 249   }
 250 #endif
 251   return bcp - code_base();
 252 }
 253 
 254 
 255 int Method::validate_bci(int bci) const {
 256   return (bci == 0 || bci < code_size()) ? bci : -1;
 257 }
 258 
 259 // Return bci if it appears to be a valid bcp
 260 // Return -1 otherwise.
 261 // Used by profiling code, when invalid data is a possibility.
 262 // The caller is responsible for validating the Method* itself.
 263 int Method::validate_bci_from_bcp(address bcp) const {
 264   // keep bci as -1 if not a valid bci
 265   int bci = -1;
 266   if (bcp == 0 || bcp == code_base()) {
 267     // code_size() may return 0 and we allow 0 here
 268     // the method may be native
 269     bci = 0;
 270   } else if (contains(bcp)) {
 271     bci = bcp - code_base();
 272   }
 273   // Assert that if we have dodged any asserts, bci is negative.
 274   assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
 275   return bci;
 276 }
 277 
 278 address Method::bcp_from(int bci) const {
 279   assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci: %d", bci);
 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_object_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 
 316 bool Method::was_executed_more_than(int n) {
 317   // Invocation counter is reset when the Method* is compiled.
 318   // If the method has compiled code we therefore assume it has
 319   // be excuted more than n times.
 320   if (is_accessor() || is_empty_method() || (code() != NULL)) {
 321     // interpreter doesn't bump invocation counter of trivial methods
 322     // compiler does not bump invocation counter of compiled methods
 323     return true;
 324   }
 325   else if ((method_counters() != NULL &&
 326             method_counters()->invocation_counter()->carry()) ||
 327            (method_data() != NULL &&
 328             method_data()->invocation_counter()->carry())) {
 329     // The carry bit is set when the counter overflows and causes
 330     // a compilation to occur.  We don't know how many times
 331     // the counter has been reset, so we simply assume it has
 332     // been executed more than n times.
 333     return true;
 334   } else {
 335     return invocation_count() > n;
 336   }
 337 }
 338 
 339 void Method::print_invocation_count() {
 340   if (is_static()) tty->print("static ");
 341   if (is_final()) tty->print("final ");
 342   if (is_synchronized()) tty->print("synchronized ");
 343   if (is_native()) tty->print("native ");
 344   tty->print("%s::", method_holder()->external_name());
 345   name()->print_symbol_on(tty);
 346   signature()->print_symbol_on(tty);
 347 
 348   if (WizardMode) {
 349     // dump the size of the byte codes
 350     tty->print(" {%d}", code_size());
 351   }
 352   tty->cr();
 353 
 354   tty->print_cr ("  interpreter_invocation_count: %8d ", interpreter_invocation_count());
 355   tty->print_cr ("  invocation_counter:           %8d ", invocation_count());
 356   tty->print_cr ("  backedge_counter:             %8d ", backedge_count());
 357 #ifndef PRODUCT
 358   if (CountCompiledCalls) {
 359     tty->print_cr ("  compiled_invocation_count: %8d ", compiled_invocation_count());
 360   }
 361 #endif
 362 }
 363 
 364 // Build a MethodData* object to hold information about this method
 365 // collected in the interpreter.
 366 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
 367   // Do not profile the method if metaspace has hit an OOM previously
 368   // allocating profiling data. Callers clear pending exception so don't
 369   // add one here.
 370   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 371     return;
 372   }
 373 
 374   // Do not profile method if current thread holds the pending list lock,
 375   // which avoids deadlock for acquiring the MethodData_lock.
 376   if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
 377     return;
 378   }
 379 
 380   // Grab a lock here to prevent multiple
 381   // MethodData*s from being created.
 382   MutexLocker ml(MethodData_lock, THREAD);
 383   if (method->method_data() == NULL) {
 384     ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
 385     MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
 386     if (HAS_PENDING_EXCEPTION) {
 387       CompileBroker::log_metaspace_failure();
 388       ClassLoaderDataGraph::set_metaspace_oom(true);
 389       return;   // return the exception (which is cleared)
 390     }
 391 
 392     method->set_method_data(method_data);
 393     if (PrintMethodData && (Verbose || WizardMode)) {
 394       ResourceMark rm(THREAD);
 395       tty->print("build_interpreter_method_data for ");
 396       method->print_name(tty);
 397       tty->cr();
 398       // At the end of the run, the MDO, full of data, will be dumped.
 399     }
 400   }
 401 }
 402 
 403 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
 404   // Do not profile the method if metaspace has hit an OOM previously
 405   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 406     return NULL;
 407   }
 408 
 409   methodHandle mh(m);
 410   MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
 411   if (HAS_PENDING_EXCEPTION) {
 412     CompileBroker::log_metaspace_failure();
 413     ClassLoaderDataGraph::set_metaspace_oom(true);
 414     return NULL;   // return the exception (which is cleared)
 415   }
 416   if (!mh->init_method_counters(counters)) {
 417     MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
 418   }
 419 
 420   if (LogTouchedMethods) {
 421     mh->log_touched(CHECK_NULL);
 422   }
 423 
 424   return mh->method_counters();
 425 }
 426 
 427 void Method::cleanup_inline_caches() {
 428   // The current system doesn't use inline caches in the interpreter
 429   // => nothing to do (keep this method around for future use)
 430 }
 431 
 432 
 433 int Method::extra_stack_words() {
 434   // not an inline function, to avoid a header dependency on Interpreter
 435   return extra_stack_entries() * Interpreter::stackElementSize;
 436 }
 437 
 438 
 439 void Method::compute_size_of_parameters(Thread *thread) {
 440   ArgumentSizeComputer asc(signature());
 441   set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
 442 }
 443 
 444 #ifdef CC_INTERP
 445 void Method::set_result_index(BasicType type)          {
 446   _result_index = Interpreter::BasicType_as_index(type);
 447 }
 448 #endif
 449 
 450 BasicType Method::result_type() const {
 451   ResultTypeFinder rtf(signature());
 452   return rtf.type();
 453 }
 454 
 455 
 456 bool Method::is_empty_method() const {
 457   return  code_size() == 1
 458       && *code_base() == Bytecodes::_return;
 459 }
 460 
 461 
 462 bool Method::is_vanilla_constructor() const {
 463   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
 464   // which only calls the superclass vanilla constructor and possibly does stores of
 465   // zero constants to local fields:
 466   //
 467   //   aload_0
 468   //   invokespecial
 469   //   indexbyte1
 470   //   indexbyte2
 471   //
 472   // followed by an (optional) sequence of:
 473   //
 474   //   aload_0
 475   //   aconst_null / iconst_0 / fconst_0 / dconst_0
 476   //   putfield
 477   //   indexbyte1
 478   //   indexbyte2
 479   //
 480   // followed by:
 481   //
 482   //   return
 483 
 484   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
 485   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
 486   int size = code_size();
 487   // Check if size match
 488   if (size == 0 || size % 5 != 0) return false;
 489   address cb = code_base();
 490   int last = size - 1;
 491   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
 492     // Does not call superclass default constructor
 493     return false;
 494   }
 495   // Check optional sequence
 496   for (int i = 4; i < last; i += 5) {
 497     if (cb[i] != Bytecodes::_aload_0) return false;
 498     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
 499     if (cb[i+2] != Bytecodes::_putfield) return false;
 500   }
 501   return true;
 502 }
 503 
 504 
 505 bool Method::compute_has_loops_flag() {
 506   BytecodeStream bcs(this);
 507   Bytecodes::Code bc;
 508 
 509   while ((bc = bcs.next()) >= 0) {
 510     switch( bc ) {
 511       case Bytecodes::_ifeq:
 512       case Bytecodes::_ifnull:
 513       case Bytecodes::_iflt:
 514       case Bytecodes::_ifle:
 515       case Bytecodes::_ifne:
 516       case Bytecodes::_ifnonnull:
 517       case Bytecodes::_ifgt:
 518       case Bytecodes::_ifge:
 519       case Bytecodes::_if_icmpeq:
 520       case Bytecodes::_if_icmpne:
 521       case Bytecodes::_if_icmplt:
 522       case Bytecodes::_if_icmpgt:
 523       case Bytecodes::_if_icmple:
 524       case Bytecodes::_if_icmpge:
 525       case Bytecodes::_if_acmpeq:
 526       case Bytecodes::_if_acmpne:
 527       case Bytecodes::_goto:
 528       case Bytecodes::_jsr:
 529         if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
 530         break;
 531 
 532       case Bytecodes::_goto_w:
 533       case Bytecodes::_jsr_w:
 534         if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
 535         break;
 536     }
 537   }
 538   _access_flags.set_loops_flag_init();
 539   return _access_flags.has_loops();
 540 }
 541 
 542 bool Method::is_final_method(AccessFlags class_access_flags) const {
 543   // or "does_not_require_vtable_entry"
 544   // default method or overpass can occur, is not final (reuses vtable entry)
 545   // private methods get vtable entries for backward class compatibility.
 546   if (is_overpass() || is_default_method())  return false;
 547   return is_final() || class_access_flags.is_final();
 548 }
 549 
 550 bool Method::is_final_method() const {
 551   return is_final_method(method_holder()->access_flags());
 552 }
 553 
 554 bool Method::is_default_method() const {
 555   if (method_holder() != NULL &&
 556       method_holder()->is_interface() &&
 557       !is_abstract()) {
 558     return true;
 559   } else {
 560     return false;
 561   }
 562 }
 563 
 564 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
 565   if (is_final_method(class_access_flags))  return true;
 566 #ifdef ASSERT
 567   ResourceMark rm;
 568   bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
 569   if (class_access_flags.is_interface()) {
 570     assert(is_nonv == is_static(), "is_nonv=%s", name_and_sig_as_C_string());
 571   }
 572 #endif
 573   assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
 574   return vtable_index() == nonvirtual_vtable_index;
 575 }
 576 
 577 bool Method::can_be_statically_bound() const {
 578   return can_be_statically_bound(method_holder()->access_flags());
 579 }
 580 
 581 bool Method::is_accessor() const {
 582   return is_getter() || is_setter();
 583 }
 584 
 585 bool Method::is_getter() const {
 586   if (code_size() != 5) return false;
 587   if (size_of_parameters() != 1) return false;
 588   if (java_code_at(0) != Bytecodes::_aload_0)  return false;
 589   if (java_code_at(1) != Bytecodes::_getfield) return false;
 590   switch (java_code_at(4)) {
 591     case Bytecodes::_ireturn:
 592     case Bytecodes::_lreturn:
 593     case Bytecodes::_freturn:
 594     case Bytecodes::_dreturn:
 595     case Bytecodes::_areturn:
 596       break;
 597     default:
 598       return false;
 599   }
 600   return true;
 601 }
 602 
 603 bool Method::is_setter() const {
 604   if (code_size() != 6) return false;
 605   if (java_code_at(0) != Bytecodes::_aload_0) return false;
 606   switch (java_code_at(1)) {
 607     case Bytecodes::_iload_1:
 608     case Bytecodes::_aload_1:
 609     case Bytecodes::_fload_1:
 610       if (size_of_parameters() != 2) return false;
 611       break;
 612     case Bytecodes::_dload_1:
 613     case Bytecodes::_lload_1:
 614       if (size_of_parameters() != 3) return false;
 615       break;
 616     default:
 617       return false;
 618   }
 619   if (java_code_at(2) != Bytecodes::_putfield) return false;
 620   if (java_code_at(5) != Bytecodes::_return)   return false;
 621   return true;
 622 }
 623 
 624 bool Method::is_constant_getter() const {
 625   int last_index = code_size() - 1;
 626   // Check if the first 1-3 bytecodes are a constant push
 627   // and the last bytecode is a return.
 628   return (2 <= code_size() && code_size() <= 4 &&
 629           Bytecodes::is_const(java_code_at(0)) &&
 630           Bytecodes::length_for(java_code_at(0)) == last_index &&
 631           Bytecodes::is_return(java_code_at(last_index)));
 632 }
 633 
 634 bool Method::is_initializer() const {
 635   return name() == vmSymbols::object_initializer_name() || is_static_initializer();
 636 }
 637 
 638 bool Method::has_valid_initializer_flags() const {
 639   return (is_static() ||
 640           method_holder()->major_version() < 51);
 641 }
 642 
 643 bool Method::is_static_initializer() const {
 644   // For classfiles version 51 or greater, ensure that the clinit method is
 645   // static.  Non-static methods with the name "<clinit>" are not static
 646   // initializers. (older classfiles exempted for backward compatibility)
 647   return name() == vmSymbols::class_initializer_name() &&
 648          has_valid_initializer_flags();
 649 }
 650 
 651 
 652 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
 653   int length = method->checked_exceptions_length();
 654   if (length == 0) {  // common case
 655     return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
 656   } else {
 657     methodHandle h_this(THREAD, method);
 658     objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
 659     objArrayHandle mirrors (THREAD, m_oop);
 660     for (int i = 0; i < length; i++) {
 661       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
 662       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
 663       assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
 664       mirrors->obj_at_put(i, k->java_mirror());
 665     }
 666     return mirrors;
 667   }
 668 };
 669 
 670 
 671 int Method::line_number_from_bci(int bci) const {
 672   if (bci == SynchronizationEntryBCI) bci = 0;
 673   assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
 674   int best_bci  =  0;
 675   int best_line = -1;
 676 
 677   if (has_linenumber_table()) {
 678     // The line numbers are a short array of 2-tuples [start_pc, line_number].
 679     // Not necessarily sorted and not necessarily one-to-one.
 680     CompressedLineNumberReadStream stream(compressed_linenumber_table());
 681     while (stream.read_pair()) {
 682       if (stream.bci() == bci) {
 683         // perfect match
 684         return stream.line();
 685       } else {
 686         // update best_bci/line
 687         if (stream.bci() < bci && stream.bci() >= best_bci) {
 688           best_bci  = stream.bci();
 689           best_line = stream.line();
 690         }
 691       }
 692     }
 693   }
 694   return best_line;
 695 }
 696 
 697 
 698 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
 699   if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
 700     Thread *thread = Thread::current();
 701     Symbol* klass_name = constants()->klass_name_at(klass_index);
 702     Handle loader(thread, method_holder()->class_loader());
 703     Handle prot  (thread, method_holder()->protection_domain());
 704     return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
 705   } else {
 706     return true;
 707   }
 708 }
 709 
 710 
 711 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
 712   int klass_index = constants()->klass_ref_index_at(refinfo_index);
 713   if (must_be_resolved) {
 714     // Make sure klass is resolved in constantpool.
 715     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
 716   }
 717   return is_klass_loaded_by_klass_index(klass_index);
 718 }
 719 
 720 
 721 void Method::set_native_function(address function, bool post_event_flag) {
 722   assert(function != NULL, "use clear_native_function to unregister natives");
 723   assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
 724   address* native_function = native_function_addr();
 725 
 726   // We can see racers trying to place the same native function into place. Once
 727   // is plenty.
 728   address current = *native_function;
 729   if (current == function) return;
 730   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
 731       function != NULL) {
 732     // native_method_throw_unsatisfied_link_error_entry() should only
 733     // be passed when post_event_flag is false.
 734     assert(function !=
 735       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 736       "post_event_flag mis-match");
 737 
 738     // post the bind event, and possible change the bind function
 739     JvmtiExport::post_native_method_bind(this, &function);
 740   }
 741   *native_function = function;
 742   // This function can be called more than once. We must make sure that we always
 743   // use the latest registered method -> check if a stub already has been generated.
 744   // If so, we have to make it not_entrant.
 745   nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
 746   if (nm != NULL) {
 747     nm->make_not_entrant();
 748   }
 749 }
 750 
 751 
 752 bool Method::has_native_function() const {
 753   if (is_method_handle_intrinsic())
 754     return false;  // special-cased in SharedRuntime::generate_native_wrapper
 755   address func = native_function();
 756   return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
 757 }
 758 
 759 
 760 void Method::clear_native_function() {
 761   // Note: is_method_handle_intrinsic() is allowed here.
 762   set_native_function(
 763     SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 764     !native_bind_event_is_interesting);
 765   clear_code();
 766 }
 767 
 768 address Method::critical_native_function() {
 769   methodHandle mh(this);
 770   return NativeLookup::lookup_critical_entry(mh);
 771 }
 772 
 773 
 774 void Method::set_signature_handler(address handler) {
 775   address* signature_handler =  signature_handler_addr();
 776   *signature_handler = handler;
 777 }
 778 
 779 
 780 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
 781   if (PrintCompilation && report) {
 782     ttyLocker ttyl;
 783     tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
 784     if (comp_level == CompLevel_all) {
 785       tty->print("all levels ");
 786     } else {
 787       tty->print("levels ");
 788       for (int i = (int)CompLevel_none; i <= comp_level; i++) {
 789         tty->print("%d ", i);
 790       }
 791     }
 792     this->print_short_name(tty);
 793     int size = this->code_size();
 794     if (size > 0) {
 795       tty->print(" (%d bytes)", size);
 796     }
 797     if (reason != NULL) {
 798       tty->print("   %s", reason);
 799     }
 800     tty->cr();
 801   }
 802   if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
 803     ttyLocker ttyl;
 804     xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
 805                      os::current_thread_id(), is_osr, comp_level);
 806     if (reason != NULL) {
 807       xtty->print(" reason=\'%s\'", reason);
 808     }
 809     xtty->method(this);
 810     xtty->stamp();
 811     xtty->end_elem();
 812   }
 813 }
 814 
 815 bool Method::is_always_compilable() const {
 816   // Generated adapters must be compiled
 817   if (is_method_handle_intrinsic() && is_synthetic()) {
 818     assert(!is_not_c1_compilable(), "sanity check");
 819     assert(!is_not_c2_compilable(), "sanity check");
 820     return true;
 821   }
 822 
 823   return false;
 824 }
 825 
 826 bool Method::is_not_compilable(int comp_level) const {
 827   if (number_of_breakpoints() > 0)
 828     return true;
 829   if (is_always_compilable())
 830     return false;
 831   if (comp_level == CompLevel_any)
 832     return is_not_c1_compilable() || is_not_c2_compilable();
 833   if (is_c1_compile(comp_level))
 834     return is_not_c1_compilable();
 835   if (is_c2_compile(comp_level))
 836     return is_not_c2_compilable();
 837   return false;
 838 }
 839 
 840 // call this when compiler finds that this method is not compilable
 841 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
 842   if (is_always_compilable()) {
 843     // Don't mark a method which should be always compilable
 844     return;
 845   }
 846   print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
 847   if (comp_level == CompLevel_all) {
 848     set_not_c1_compilable();
 849     set_not_c2_compilable();
 850   } else {
 851     if (is_c1_compile(comp_level))
 852       set_not_c1_compilable();
 853     if (is_c2_compile(comp_level))
 854       set_not_c2_compilable();
 855   }
 856   CompilationPolicy::policy()->disable_compilation(this);
 857   assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
 858 }
 859 
 860 bool Method::is_not_osr_compilable(int comp_level) const {
 861   if (is_not_compilable(comp_level))
 862     return true;
 863   if (comp_level == CompLevel_any)
 864     return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
 865   if (is_c1_compile(comp_level))
 866     return is_not_c1_osr_compilable();
 867   if (is_c2_compile(comp_level))
 868     return is_not_c2_osr_compilable();
 869   return false;
 870 }
 871 
 872 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
 873   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
 874   if (comp_level == CompLevel_all) {
 875     set_not_c1_osr_compilable();
 876     set_not_c2_osr_compilable();
 877   } else {
 878     if (is_c1_compile(comp_level))
 879       set_not_c1_osr_compilable();
 880     if (is_c2_compile(comp_level))
 881       set_not_c2_osr_compilable();
 882   }
 883   CompilationPolicy::policy()->disable_compilation(this);
 884   assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
 885 }
 886 
 887 // Revert to using the interpreter and clear out the nmethod
 888 void Method::clear_code() {
 889 
 890   // this may be NULL if c2i adapters have not been made yet
 891   // Only should happen at allocate time.
 892   if (_adapter == NULL) {
 893     _from_compiled_entry    = NULL;
 894   } else {
 895     _from_compiled_entry    = _adapter->get_c2i_entry();
 896   }
 897   OrderAccess::storestore();
 898   _from_interpreted_entry = _i2i_entry;
 899   OrderAccess::storestore();
 900   _code = NULL;
 901 }
 902 
 903 // Called by class data sharing to remove any entry points (which are not shared)
 904 void Method::unlink_method() {
 905   _code = NULL;
 906   _i2i_entry = NULL;
 907   _from_interpreted_entry = NULL;
 908   if (is_native()) {
 909     *native_function_addr() = NULL;
 910     set_signature_handler(NULL);
 911   }
 912   NOT_PRODUCT(set_compiled_invocation_count(0);)
 913   _adapter = NULL;
 914   _from_compiled_entry = NULL;
 915 
 916   // In case of DumpSharedSpaces, _method_data should always be NULL.
 917   //
 918   // During runtime (!DumpSharedSpaces), when we are cleaning a
 919   // shared class that failed to load, this->link_method() may
 920   // have already been called (before an exception happened), so
 921   // this->_method_data may not be NULL.
 922   assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
 923 
 924   set_method_data(NULL);
 925   clear_method_counters();
 926 }
 927 
 928 // Called when the method_holder is getting linked. Setup entrypoints so the method
 929 // is ready to be called from interpreter, compiler, and vtables.
 930 void Method::link_method(const methodHandle& h_method, TRAPS) {
 931   // If the code cache is full, we may reenter this function for the
 932   // leftover methods that weren't linked.
 933   if (_i2i_entry != NULL) return;
 934 
 935   assert(_adapter == NULL, "init'd to NULL" );
 936   assert( _code == NULL, "nothing compiled yet" );
 937 
 938   // Setup interpreter entrypoint
 939   assert(this == h_method(), "wrong h_method()" );
 940   address entry = Interpreter::entry_for_method(h_method);
 941   assert(entry != NULL, "interpreter entry must be non-null");
 942   // Sets both _i2i_entry and _from_interpreted_entry
 943   set_interpreter_entry(entry);
 944 
 945   // Don't overwrite already registered native entries.
 946   if (is_native() && !has_native_function()) {
 947     set_native_function(
 948       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 949       !native_bind_event_is_interesting);
 950   }
 951 
 952   // Setup compiler entrypoint.  This is made eagerly, so we do not need
 953   // special handling of vtables.  An alternative is to make adapters more
 954   // lazily by calling make_adapter() from from_compiled_entry() for the
 955   // normal calls.  For vtable calls life gets more complicated.  When a
 956   // call-site goes mega-morphic we need adapters in all methods which can be
 957   // called from the vtable.  We need adapters on such methods that get loaded
 958   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
 959   // problem we'll make these lazily later.
 960   (void) make_adapters(h_method, CHECK);
 961 
 962   // ONLY USE the h_method now as make_adapter may have blocked
 963 
 964 }
 965 
 966 address Method::make_adapters(methodHandle mh, TRAPS) {
 967   // Adapters for compiled code are made eagerly here.  They are fairly
 968   // small (generally < 100 bytes) and quick to make (and cached and shared)
 969   // so making them eagerly shouldn't be too expensive.
 970   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
 971   if (adapter == NULL ) {
 972     THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
 973   }
 974 
 975   mh->set_adapter_entry(adapter);
 976   mh->_from_compiled_entry = adapter->get_c2i_entry();
 977   return adapter->get_c2i_entry();
 978 }
 979 
 980 void Method::restore_unshareable_info(TRAPS) {
 981   // Since restore_unshareable_info can be called more than once for a method, don't
 982   // redo any work.   If this field is restored, there is nothing to do.
 983   if (_from_compiled_entry == NULL) {
 984     // restore method's vtable by calling a virtual function
 985     restore_vtable();
 986 
 987     methodHandle mh(THREAD, this);
 988     link_method(mh, CHECK);
 989   }
 990 }
 991 
 992 
 993 // The verified_code_entry() must be called when a invoke is resolved
 994 // on this method.
 995 
 996 // It returns the compiled code entry point, after asserting not null.
 997 // This function is called after potential safepoints so that nmethod
 998 // or adapter that it points to is still live and valid.
 999 // This function must not hit a safepoint!
1000 address Method::verified_code_entry() {
1001   debug_only(No_Safepoint_Verifier nsv;)
1002   assert(_from_compiled_entry != NULL, "must be set");
1003   return _from_compiled_entry;
1004 }
1005 
1006 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1007 // (could be racing a deopt).
1008 // Not inline to avoid circular ref.
1009 bool Method::check_code() const {
1010   // cached in a register or local.  There's a race on the value of the field.
1011   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1012   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1013 }
1014 
1015 // Install compiled code.  Instantly it can execute.
1016 void Method::set_code(methodHandle mh, nmethod *code) {
1017   assert( code, "use clear_code to remove code" );
1018   assert( mh->check_code(), "" );
1019 
1020   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1021 
1022   // These writes must happen in this order, because the interpreter will
1023   // directly jump to from_interpreted_entry which jumps to an i2c adapter
1024   // which jumps to _from_compiled_entry.
1025   mh->_code = code;             // Assign before allowing compiled code to exec
1026 
1027   int comp_level = code->comp_level();
1028   // In theory there could be a race here. In practice it is unlikely
1029   // and not worth worrying about.
1030   if (comp_level > mh->highest_comp_level()) {
1031     mh->set_highest_comp_level(comp_level);
1032   }
1033 
1034   OrderAccess::storestore();
1035 #ifdef SHARK
1036   mh->_from_interpreted_entry = code->insts_begin();
1037 #else //!SHARK
1038   mh->_from_compiled_entry = code->verified_entry_point();
1039   OrderAccess::storestore();
1040   // Instantly compiled code can execute.
1041   if (!mh->is_method_handle_intrinsic())
1042     mh->_from_interpreted_entry = mh->get_i2c_entry();
1043 #endif //!SHARK
1044 }
1045 
1046 
1047 bool Method::is_overridden_in(Klass* k) const {
1048   InstanceKlass* ik = InstanceKlass::cast(k);
1049 
1050   if (ik->is_interface()) return false;
1051 
1052   // If method is an interface, we skip it - except if it
1053   // is a miranda method
1054   if (method_holder()->is_interface()) {
1055     // Check that method is not a miranda method
1056     if (ik->lookup_method(name(), signature()) == NULL) {
1057       // No implementation exist - so miranda method
1058       return false;
1059     }
1060     return true;
1061   }
1062 
1063   assert(ik->is_subclass_of(method_holder()), "should be subklass");
1064   assert(ik->vtable() != NULL, "vtable should exist");
1065   if (!has_vtable_index()) {
1066     return false;
1067   } else {
1068     Method* vt_m = ik->method_at_vtable(vtable_index());
1069     return vt_m != this;
1070   }
1071 }
1072 
1073 
1074 // give advice about whether this Method* should be cached or not
1075 bool Method::should_not_be_cached() const {
1076   if (is_old()) {
1077     // This method has been redefined. It is either EMCP or obsolete
1078     // and we don't want to cache it because that would pin the method
1079     // down and prevent it from being collectible if and when it
1080     // finishes executing.
1081     return true;
1082   }
1083 
1084   // caching this method should be just fine
1085   return false;
1086 }
1087 
1088 
1089 /**
1090  *  Returns true if this is one of the specially treated methods for
1091  *  security related stack walks (like Reflection.getCallerClass).
1092  */
1093 bool Method::is_ignored_by_security_stack_walk() const {
1094   if (intrinsic_id() == vmIntrinsics::_invoke) {
1095     // This is Method.invoke() -- ignore it
1096     return true;
1097   }
1098   if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1099     // This is an auxilary frame -- ignore it
1100     return true;
1101   }
1102   if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1103     // This is an internal adapter frame for method handles -- ignore it
1104     return true;
1105   }
1106   return false;
1107 }
1108 
1109 
1110 // Constant pool structure for invoke methods:
1111 enum {
1112   _imcp_invoke_name = 1,        // utf8: 'invokeExact', etc.
1113   _imcp_invoke_signature,       // utf8: (variable Symbol*)
1114   _imcp_limit
1115 };
1116 
1117 // Test if this method is an MH adapter frame generated by Java code.
1118 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1119 bool Method::is_compiled_lambda_form() const {
1120   return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1121 }
1122 
1123 // Test if this method is an internal MH primitive method.
1124 bool Method::is_method_handle_intrinsic() const {
1125   vmIntrinsics::ID iid = intrinsic_id();
1126   return (MethodHandles::is_signature_polymorphic(iid) &&
1127           MethodHandles::is_signature_polymorphic_intrinsic(iid));
1128 }
1129 
1130 bool Method::has_member_arg() const {
1131   vmIntrinsics::ID iid = intrinsic_id();
1132   return (MethodHandles::is_signature_polymorphic(iid) &&
1133           MethodHandles::has_member_arg(iid));
1134 }
1135 
1136 // Make an instance of a signature-polymorphic internal MH primitive.
1137 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1138                                                          Symbol* signature,
1139                                                          TRAPS) {
1140   ResourceMark rm;
1141   methodHandle empty;
1142 
1143   KlassHandle holder = SystemDictionary::MethodHandle_klass();
1144   Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1145   assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1146   if (TraceMethodHandles) {
1147     tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1148   }
1149 
1150   // invariant:   cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1151   name->increment_refcount();
1152   signature->increment_refcount();
1153 
1154   int cp_length = _imcp_limit;
1155   ClassLoaderData* loader_data = holder->class_loader_data();
1156   constantPoolHandle cp;
1157   {
1158     ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1159     cp = constantPoolHandle(THREAD, cp_oop);
1160   }
1161   cp->set_pool_holder(InstanceKlass::cast(holder()));
1162   cp->symbol_at_put(_imcp_invoke_name,       name);
1163   cp->symbol_at_put(_imcp_invoke_signature,  signature);
1164   cp->set_has_preresolution();
1165 
1166   // decide on access bits:  public or not?
1167   int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1168   bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1169   if (must_be_static)  flags_bits |= JVM_ACC_STATIC;
1170   assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1171 
1172   methodHandle m;
1173   {
1174     InlineTableSizes sizes;
1175     Method* m_oop = Method::allocate(loader_data, 0,
1176                                      accessFlags_from(flags_bits), &sizes,
1177                                      ConstMethod::NORMAL, CHECK_(empty));
1178     m = methodHandle(THREAD, m_oop);
1179   }
1180   m->set_constants(cp());
1181   m->set_name_index(_imcp_invoke_name);
1182   m->set_signature_index(_imcp_invoke_signature);
1183   assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1184   assert(m->signature() == signature, "");
1185 #ifdef CC_INTERP
1186   ResultTypeFinder rtf(signature);
1187   m->set_result_index(rtf.type());
1188 #endif
1189   m->compute_size_of_parameters(THREAD);
1190   m->init_intrinsic_id();
1191   assert(m->is_method_handle_intrinsic(), "");
1192 #ifdef ASSERT
1193   if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id()))  m->print();
1194   assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1195   assert(m->intrinsic_id() == iid, "correctly predicted iid");
1196 #endif //ASSERT
1197 
1198   // Finally, set up its entry points.
1199   assert(m->can_be_statically_bound(), "");
1200   m->set_vtable_index(Method::nonvirtual_vtable_index);
1201   m->link_method(m, CHECK_(empty));
1202 
1203   if (TraceMethodHandles && (Verbose || WizardMode))
1204     m->print_on(tty);
1205 
1206   return m;
1207 }
1208 
1209 Klass* Method::check_non_bcp_klass(Klass* klass) {
1210   if (klass != NULL && klass->class_loader() != NULL) {
1211     if (klass->is_objArray_klass())
1212       klass = ObjArrayKlass::cast(klass)->bottom_klass();
1213     return klass;
1214   }
1215   return NULL;
1216 }
1217 
1218 
1219 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
1220                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1221   // Code below does not work for native methods - they should never get rewritten anyway
1222   assert(!m->is_native(), "cannot rewrite native methods");
1223   // Allocate new Method*
1224   AccessFlags flags = m->access_flags();
1225 
1226   ConstMethod* cm = m->constMethod();
1227   int checked_exceptions_len = cm->checked_exceptions_length();
1228   int localvariable_len = cm->localvariable_table_length();
1229   int exception_table_len = cm->exception_table_length();
1230   int method_parameters_len = cm->method_parameters_length();
1231   int method_annotations_len = cm->method_annotations_length();
1232   int parameter_annotations_len = cm->parameter_annotations_length();
1233   int type_annotations_len = cm->type_annotations_length();
1234   int default_annotations_len = cm->default_annotations_length();
1235 
1236   InlineTableSizes sizes(
1237       localvariable_len,
1238       new_compressed_linenumber_size,
1239       exception_table_len,
1240       checked_exceptions_len,
1241       method_parameters_len,
1242       cm->generic_signature_index(),
1243       method_annotations_len,
1244       parameter_annotations_len,
1245       type_annotations_len,
1246       default_annotations_len,
1247       0);
1248 
1249   ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1250   Method* newm_oop = Method::allocate(loader_data,
1251                                       new_code_length,
1252                                       flags,
1253                                       &sizes,
1254                                       m->method_type(),
1255                                       CHECK_(methodHandle()));
1256   methodHandle newm (THREAD, newm_oop);
1257 
1258   // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1259   ConstMethod* newcm = newm->constMethod();
1260   int new_const_method_size = newm->constMethod()->size();
1261 
1262   memcpy(newm(), m(), sizeof(Method));
1263 
1264   // Create shallow copy of ConstMethod.
1265   memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1266 
1267   // Reset correct method/const method, method size, and parameter info
1268   newm->set_constMethod(newcm);
1269   newm->constMethod()->set_code_size(new_code_length);
1270   newm->constMethod()->set_constMethod_size(new_const_method_size);
1271   assert(newm->code_size() == new_code_length, "check");
1272   assert(newm->method_parameters_length() == method_parameters_len, "check");
1273   assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1274   assert(newm->exception_table_length() == exception_table_len, "check");
1275   assert(newm->localvariable_table_length() == localvariable_len, "check");
1276   // Copy new byte codes
1277   memcpy(newm->code_base(), new_code, new_code_length);
1278   // Copy line number table
1279   if (new_compressed_linenumber_size > 0) {
1280     memcpy(newm->compressed_linenumber_table(),
1281            new_compressed_linenumber_table,
1282            new_compressed_linenumber_size);
1283   }
1284   // Copy method_parameters
1285   if (method_parameters_len > 0) {
1286     memcpy(newm->method_parameters_start(),
1287            m->method_parameters_start(),
1288            method_parameters_len * sizeof(MethodParametersElement));
1289   }
1290   // Copy checked_exceptions
1291   if (checked_exceptions_len > 0) {
1292     memcpy(newm->checked_exceptions_start(),
1293            m->checked_exceptions_start(),
1294            checked_exceptions_len * sizeof(CheckedExceptionElement));
1295   }
1296   // Copy exception table
1297   if (exception_table_len > 0) {
1298     memcpy(newm->exception_table_start(),
1299            m->exception_table_start(),
1300            exception_table_len * sizeof(ExceptionTableElement));
1301   }
1302   // Copy local variable number table
1303   if (localvariable_len > 0) {
1304     memcpy(newm->localvariable_table_start(),
1305            m->localvariable_table_start(),
1306            localvariable_len * sizeof(LocalVariableTableElement));
1307   }
1308   // Copy stackmap table
1309   if (m->has_stackmap_table()) {
1310     int code_attribute_length = m->stackmap_data()->length();
1311     Array<u1>* stackmap_data =
1312       MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1313     memcpy((void*)stackmap_data->adr_at(0),
1314            (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1315     newm->set_stackmap_data(stackmap_data);
1316   }
1317 
1318   // copy annotations over to new method
1319   newcm->copy_annotations_from(cm);
1320   return newm;
1321 }
1322 
1323 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1324   // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1325   // because we are not loading from core libraries
1326   // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1327   // which does not use the class default class loader so we check for its loader here
1328   const InstanceKlass* ik = InstanceKlass::cast(holder);
1329   if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
1330     return vmSymbols::NO_SID;   // regardless of name, no intrinsics here
1331   }
1332 
1333   // see if the klass name is well-known:
1334   Symbol* klass_name = ik->name();
1335   return vmSymbols::find_sid(klass_name);
1336 }
1337 
1338 static bool is_unsafe_alias(vmSymbols::SID name_id) {
1339   // All 70 intrinsic candidate methods from sun.misc.Unsafe in 1.8.
1340   // Some have the same method name but different signature, e.g.
1341   // getByte(long), getByte(Object,long)
1342   switch (name_id) {
1343     case vmSymbols::VM_SYMBOL_ENUM_NAME(allocateInstance_name):
1344     case vmSymbols::VM_SYMBOL_ENUM_NAME(copyMemory_name):
1345     case vmSymbols::VM_SYMBOL_ENUM_NAME(loadFence_name):
1346     case vmSymbols::VM_SYMBOL_ENUM_NAME(storeFence_name):
1347     case vmSymbols::VM_SYMBOL_ENUM_NAME(fullFence_name):
1348     case vmSymbols::VM_SYMBOL_ENUM_NAME(getObject_name):
1349     case vmSymbols::VM_SYMBOL_ENUM_NAME(getBoolean_name):
1350     case vmSymbols::VM_SYMBOL_ENUM_NAME(getByte_name):
1351     case vmSymbols::VM_SYMBOL_ENUM_NAME(getShort_name):
1352     case vmSymbols::VM_SYMBOL_ENUM_NAME(getChar_name):
1353     case vmSymbols::VM_SYMBOL_ENUM_NAME(getInt_name):
1354     case vmSymbols::VM_SYMBOL_ENUM_NAME(getLong_name):
1355     case vmSymbols::VM_SYMBOL_ENUM_NAME(getFloat_name):
1356     case vmSymbols::VM_SYMBOL_ENUM_NAME(getDouble_name):
1357     case vmSymbols::VM_SYMBOL_ENUM_NAME(putObject_name):
1358     case vmSymbols::VM_SYMBOL_ENUM_NAME(putBoolean_name):
1359     case vmSymbols::VM_SYMBOL_ENUM_NAME(putByte_name):
1360     case vmSymbols::VM_SYMBOL_ENUM_NAME(putShort_name):
1361     case vmSymbols::VM_SYMBOL_ENUM_NAME(putChar_name):
1362     case vmSymbols::VM_SYMBOL_ENUM_NAME(putInt_name):
1363     case vmSymbols::VM_SYMBOL_ENUM_NAME(putLong_name):
1364     case vmSymbols::VM_SYMBOL_ENUM_NAME(putFloat_name):
1365     case vmSymbols::VM_SYMBOL_ENUM_NAME(putDouble_name):
1366     case vmSymbols::VM_SYMBOL_ENUM_NAME(getObjectVolatile_name):
1367     case vmSymbols::VM_SYMBOL_ENUM_NAME(getBooleanVolatile_name):
1368     case vmSymbols::VM_SYMBOL_ENUM_NAME(getByteVolatile_name):
1369     case vmSymbols::VM_SYMBOL_ENUM_NAME(getShortVolatile_name):
1370     case vmSymbols::VM_SYMBOL_ENUM_NAME(getCharVolatile_name):
1371     case vmSymbols::VM_SYMBOL_ENUM_NAME(getIntVolatile_name):
1372     case vmSymbols::VM_SYMBOL_ENUM_NAME(getLongVolatile_name):
1373     case vmSymbols::VM_SYMBOL_ENUM_NAME(getFloatVolatile_name):
1374     case vmSymbols::VM_SYMBOL_ENUM_NAME(getDoubleVolatile_name):
1375     case vmSymbols::VM_SYMBOL_ENUM_NAME(putObjectVolatile_name):
1376     case vmSymbols::VM_SYMBOL_ENUM_NAME(putBooleanVolatile_name):
1377     case vmSymbols::VM_SYMBOL_ENUM_NAME(putByteVolatile_name):
1378     case vmSymbols::VM_SYMBOL_ENUM_NAME(putShortVolatile_name):
1379     case vmSymbols::VM_SYMBOL_ENUM_NAME(putCharVolatile_name):
1380     case vmSymbols::VM_SYMBOL_ENUM_NAME(putIntVolatile_name):
1381     case vmSymbols::VM_SYMBOL_ENUM_NAME(putLongVolatile_name):
1382     case vmSymbols::VM_SYMBOL_ENUM_NAME(putFloatVolatile_name):
1383     case vmSymbols::VM_SYMBOL_ENUM_NAME(putDoubleVolatile_name):
1384     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAddress_name):
1385     case vmSymbols::VM_SYMBOL_ENUM_NAME(putAddress_name):
1386     case vmSymbols::VM_SYMBOL_ENUM_NAME(compareAndSwapObject_name):
1387     case vmSymbols::VM_SYMBOL_ENUM_NAME(compareAndSwapLong_name):
1388     case vmSymbols::VM_SYMBOL_ENUM_NAME(compareAndSwapInt_name):
1389     case vmSymbols::VM_SYMBOL_ENUM_NAME(putOrderedObject_name):
1390     case vmSymbols::VM_SYMBOL_ENUM_NAME(putOrderedLong_name):
1391     case vmSymbols::VM_SYMBOL_ENUM_NAME(putOrderedInt_name):
1392     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAndAddInt_name):
1393     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAndAddLong_name):
1394     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAndSetInt_name):
1395     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAndSetLong_name):
1396     case vmSymbols::VM_SYMBOL_ENUM_NAME(getAndSetObject_name):
1397     case vmSymbols::VM_SYMBOL_ENUM_NAME(park_name):
1398     case vmSymbols::VM_SYMBOL_ENUM_NAME(unpark_name):
1399       return true;
1400   }
1401 
1402   return false;
1403 }
1404 
1405 void Method::init_intrinsic_id() {
1406   assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1407   const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1408   assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1409   assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1410 
1411   // the klass name is well-known:
1412   vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1413   assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1414 
1415   // ditto for method and signature:
1416   vmSymbols::SID  name_id = vmSymbols::find_sid(name());
1417   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1418       && name_id == vmSymbols::NO_SID)
1419     return;
1420   vmSymbols::SID   sig_id = vmSymbols::find_sid(signature());
1421   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1422       && sig_id == vmSymbols::NO_SID)  return;
1423   jshort flags = access_flags().as_short();
1424 
1425   vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1426   if (id != vmIntrinsics::_none) {
1427     set_intrinsic_id(id);
1428     if (id == vmIntrinsics::_Class_cast) {
1429       // Even if the intrinsic is rejected, we want to inline this simple method.
1430       set_force_inline(true);
1431     }
1432     return;
1433   }
1434 
1435   // A few slightly irregular cases:
1436   switch (klass_id) {
1437   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1438     // Second chance: check in regular Math.
1439     switch (name_id) {
1440     case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1441     case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1442     case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1443       // pretend it is the corresponding method in the non-strict class:
1444       klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1445       id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1446       break;
1447     }
1448     break;
1449 
1450   // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
1451   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1452     if (!is_native())  break;
1453     id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1454     if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1455       id = vmIntrinsics::_none;
1456     break;
1457 
1458   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Unsafe):
1459     // Map sun.misc.Unsafe to jdk.internal.misc.Unsafe
1460     if (!is_unsafe_alias(name_id))  break;
1461     // pretend it is the corresponding method in the internal Unsafe class:
1462     klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Unsafe);
1463     id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1464     break;
1465   }
1466 
1467   if (id != vmIntrinsics::_none) {
1468     // Set up its iid.  It is an alias method.
1469     set_intrinsic_id(id);
1470     return;
1471   }
1472 }
1473 
1474 // These two methods are static since a GC may move the Method
1475 bool Method::load_signature_classes(methodHandle m, TRAPS) {
1476   if (!THREAD->can_call_java()) {
1477     // There is nothing useful this routine can do from within the Compile thread.
1478     // Hopefully, the signature contains only well-known classes.
1479     // We could scan for this and return true/false, but the caller won't care.
1480     return false;
1481   }
1482   bool sig_is_loaded = true;
1483   Handle class_loader(THREAD, m->method_holder()->class_loader());
1484   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1485   ResourceMark rm(THREAD);
1486   Symbol*  signature = m->signature();
1487   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1488     if (ss.is_object()) {
1489       Symbol* sym = ss.as_symbol(CHECK_(false));
1490       Symbol*  name  = sym;
1491       Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1492                                              protection_domain, THREAD);
1493       // We are loading classes eagerly. If a ClassNotFoundException or
1494       // a LinkageError was generated, be sure to ignore it.
1495       if (HAS_PENDING_EXCEPTION) {
1496         if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1497             PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1498           CLEAR_PENDING_EXCEPTION;
1499         } else {
1500           return false;
1501         }
1502       }
1503       if( klass == NULL) { sig_is_loaded = false; }
1504     }
1505   }
1506   return sig_is_loaded;
1507 }
1508 
1509 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
1510   Handle class_loader(THREAD, m->method_holder()->class_loader());
1511   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1512   ResourceMark rm(THREAD);
1513   Symbol*  signature = m->signature();
1514   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1515     if (ss.type() == T_OBJECT) {
1516       Symbol* name = ss.as_symbol_or_null();
1517       if (name == NULL) return true;
1518       Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1519       if (klass == NULL) return true;
1520     }
1521   }
1522   return false;
1523 }
1524 
1525 // Exposed so field engineers can debug VM
1526 void Method::print_short_name(outputStream* st) {
1527   ResourceMark rm;
1528 #ifdef PRODUCT
1529   st->print(" %s::", method_holder()->external_name());
1530 #else
1531   st->print(" %s::", method_holder()->internal_name());
1532 #endif
1533   name()->print_symbol_on(st);
1534   if (WizardMode) signature()->print_symbol_on(st);
1535   else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1536     MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1537 }
1538 
1539 // Comparer for sorting an object array containing
1540 // Method*s.
1541 static int method_comparator(Method* a, Method* b) {
1542   return a->name()->fast_compare(b->name());
1543 }
1544 
1545 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1546 // default_methods also uses this without the ordering for fast find_method
1547 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1548   int length = methods->length();
1549   if (length > 1) {
1550     {
1551       No_Safepoint_Verifier nsv;
1552       QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
1553     }
1554     // Reset method ordering
1555     if (set_idnums) {
1556       for (int i = 0; i < length; i++) {
1557         Method* m = methods->at(i);
1558         m->set_method_idnum(i);
1559         m->set_orig_method_idnum(i);
1560       }
1561     }
1562   }
1563 }
1564 
1565 //-----------------------------------------------------------------------------------
1566 // Non-product code unless JVM/TI needs it
1567 
1568 #if !defined(PRODUCT) || INCLUDE_JVMTI
1569 class SignatureTypePrinter : public SignatureTypeNames {
1570  private:
1571   outputStream* _st;
1572   bool _use_separator;
1573 
1574   void type_name(const char* name) {
1575     if (_use_separator) _st->print(", ");
1576     _st->print("%s", name);
1577     _use_separator = true;
1578   }
1579 
1580  public:
1581   SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1582     _st = st;
1583     _use_separator = false;
1584   }
1585 
1586   void print_parameters()              { _use_separator = false; iterate_parameters(); }
1587   void print_returntype()              { _use_separator = false; iterate_returntype(); }
1588 };
1589 
1590 
1591 void Method::print_name(outputStream* st) {
1592   Thread *thread = Thread::current();
1593   ResourceMark rm(thread);
1594   st->print("%s ", is_static() ? "static" : "virtual");
1595   if (WizardMode) {
1596     st->print("%s.", method_holder()->internal_name());
1597     name()->print_symbol_on(st);
1598     signature()->print_symbol_on(st);
1599   } else {
1600     SignatureTypePrinter sig(signature(), st);
1601     sig.print_returntype();
1602     st->print(" %s.", method_holder()->internal_name());
1603     name()->print_symbol_on(st);
1604     st->print("(");
1605     sig.print_parameters();
1606     st->print(")");
1607   }
1608 }
1609 #endif // !PRODUCT || INCLUDE_JVMTI
1610 
1611 
1612 void Method::print_codes_on(outputStream* st) const {
1613   print_codes_on(0, code_size(), st);
1614 }
1615 
1616 void Method::print_codes_on(int from, int to, outputStream* st) const {
1617   Thread *thread = Thread::current();
1618   ResourceMark rm(thread);
1619   methodHandle mh (thread, (Method*)this);
1620   BytecodeStream s(mh);
1621   s.set_interval(from, to);
1622   BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1623   while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1624 }
1625 
1626 
1627 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1628 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1629 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1630 // as end-of-stream terminator.
1631 
1632 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1633   // bci and line number does not compress into single byte.
1634   // Write out escape character and use regular compression for bci and line number.
1635   write_byte((jubyte)0xFF);
1636   write_signed_int(bci_delta);
1637   write_signed_int(line_delta);
1638 }
1639 
1640 // See comment in method.hpp which explains why this exists.
1641 #if defined(_M_AMD64) && _MSC_VER >= 1400
1642 #pragma optimize("", off)
1643 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1644   write_pair_inline(bci, line);
1645 }
1646 #pragma optimize("", on)
1647 #endif
1648 
1649 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1650   _bci = 0;
1651   _line = 0;
1652 };
1653 
1654 
1655 bool CompressedLineNumberReadStream::read_pair() {
1656   jubyte next = read_byte();
1657   // Check for terminator
1658   if (next == 0) return false;
1659   if (next == 0xFF) {
1660     // Escape character, regular compression used
1661     _bci  += read_signed_int();
1662     _line += read_signed_int();
1663   } else {
1664     // Single byte compression used
1665     _bci  += next >> 3;
1666     _line += next & 0x7;
1667   }
1668   return true;
1669 }
1670 
1671 
1672 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1673   BreakpointInfo* bp = method_holder()->breakpoints();
1674   for (; bp != NULL; bp = bp->next()) {
1675     if (bp->match(this, bci)) {
1676       return bp->orig_bytecode();
1677     }
1678   }
1679   {
1680     ResourceMark rm;
1681     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1682   }
1683   return Bytecodes::_shouldnotreachhere;
1684 }
1685 
1686 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1687   assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1688   BreakpointInfo* bp = method_holder()->breakpoints();
1689   for (; bp != NULL; bp = bp->next()) {
1690     if (bp->match(this, bci)) {
1691       bp->set_orig_bytecode(code);
1692       // and continue, in case there is more than one
1693     }
1694   }
1695 }
1696 
1697 void Method::set_breakpoint(int bci) {
1698   InstanceKlass* ik = method_holder();
1699   BreakpointInfo *bp = new BreakpointInfo(this, bci);
1700   bp->set_next(ik->breakpoints());
1701   ik->set_breakpoints(bp);
1702   // do this last:
1703   bp->set(this);
1704 }
1705 
1706 static void clear_matches(Method* m, int bci) {
1707   InstanceKlass* ik = m->method_holder();
1708   BreakpointInfo* prev_bp = NULL;
1709   BreakpointInfo* next_bp;
1710   for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1711     next_bp = bp->next();
1712     // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1713     if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1714       // do this first:
1715       bp->clear(m);
1716       // unhook it
1717       if (prev_bp != NULL)
1718         prev_bp->set_next(next_bp);
1719       else
1720         ik->set_breakpoints(next_bp);
1721       delete bp;
1722       // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1723       // at same location. So we have multiple matching (method_index and bci)
1724       // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1725       // breakpoint for clear_breakpoint request and keep all other method versions
1726       // BreakpointInfo for future clear_breakpoint request.
1727       // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1728       // which is being called when class is unloaded. We delete all the Breakpoint
1729       // information for all versions of method. We may not correctly restore the original
1730       // bytecode in all method versions, but that is ok. Because the class is being unloaded
1731       // so these methods won't be used anymore.
1732       if (bci >= 0) {
1733         break;
1734       }
1735     } else {
1736       // This one is a keeper.
1737       prev_bp = bp;
1738     }
1739   }
1740 }
1741 
1742 void Method::clear_breakpoint(int bci) {
1743   assert(bci >= 0, "");
1744   clear_matches(this, bci);
1745 }
1746 
1747 void Method::clear_all_breakpoints() {
1748   clear_matches(this, -1);
1749 }
1750 
1751 
1752 int Method::invocation_count() {
1753   MethodCounters *mcs = method_counters();
1754   if (TieredCompilation) {
1755     MethodData* const mdo = method_data();
1756     if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1757         ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1758       return InvocationCounter::count_limit;
1759     } else {
1760       return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1761              ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1762     }
1763   } else {
1764     return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1765   }
1766 }
1767 
1768 int Method::backedge_count() {
1769   MethodCounters *mcs = method_counters();
1770   if (TieredCompilation) {
1771     MethodData* const mdo = method_data();
1772     if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1773         ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1774       return InvocationCounter::count_limit;
1775     } else {
1776       return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1777              ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1778     }
1779   } else {
1780     return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1781   }
1782 }
1783 
1784 int Method::highest_comp_level() const {
1785   const MethodCounters* mcs = method_counters();
1786   if (mcs != NULL) {
1787     return mcs->highest_comp_level();
1788   } else {
1789     return CompLevel_none;
1790   }
1791 }
1792 
1793 int Method::highest_osr_comp_level() const {
1794   const MethodCounters* mcs = method_counters();
1795   if (mcs != NULL) {
1796     return mcs->highest_osr_comp_level();
1797   } else {
1798     return CompLevel_none;
1799   }
1800 }
1801 
1802 void Method::set_highest_comp_level(int level) {
1803   MethodCounters* mcs = method_counters();
1804   if (mcs != NULL) {
1805     mcs->set_highest_comp_level(level);
1806   }
1807 }
1808 
1809 void Method::set_highest_osr_comp_level(int level) {
1810   MethodCounters* mcs = method_counters();
1811   if (mcs != NULL) {
1812     mcs->set_highest_osr_comp_level(level);
1813   }
1814 }
1815 
1816 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1817   _bci = bci;
1818   _name_index = m->name_index();
1819   _signature_index = m->signature_index();
1820   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1821   if (_orig_bytecode == Bytecodes::_breakpoint)
1822     _orig_bytecode = m->orig_bytecode_at(_bci);
1823   _next = NULL;
1824 }
1825 
1826 void BreakpointInfo::set(Method* method) {
1827 #ifdef ASSERT
1828   {
1829     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1830     if (code == Bytecodes::_breakpoint)
1831       code = method->orig_bytecode_at(_bci);
1832     assert(orig_bytecode() == code, "original bytecode must be the same");
1833   }
1834 #endif
1835   Thread *thread = Thread::current();
1836   *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1837   method->incr_number_of_breakpoints(thread);
1838   SystemDictionary::notice_modification();
1839   {
1840     // Deoptimize all dependents on this method
1841     HandleMark hm(thread);
1842     methodHandle mh(thread, method);
1843     CodeCache::flush_dependents_on_method(mh);
1844   }
1845 }
1846 
1847 void BreakpointInfo::clear(Method* method) {
1848   *method->bcp_from(_bci) = orig_bytecode();
1849   assert(method->number_of_breakpoints() > 0, "must not go negative");
1850   method->decr_number_of_breakpoints(Thread::current());
1851 }
1852 
1853 // jmethodID handling
1854 
1855 // This is a block allocating object, sort of like JNIHandleBlock, only a
1856 // lot simpler.
1857 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1858 // never get rid of it.
1859 
1860 static const int min_block_size = 8;
1861 
1862 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1863   friend class JNIMethodBlock;
1864   Method**        _methods;
1865   int             _number_of_methods;
1866   int             _top;
1867   JNIMethodBlockNode* _next;
1868 
1869  public:
1870 
1871   JNIMethodBlockNode(int num_methods = min_block_size);
1872 
1873   ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1874 
1875   void ensure_methods(int num_addl_methods) {
1876     if (_top < _number_of_methods) {
1877       num_addl_methods -= _number_of_methods - _top;
1878       if (num_addl_methods <= 0) {
1879         return;
1880       }
1881     }
1882     if (_next == NULL) {
1883       _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1884     } else {
1885       _next->ensure_methods(num_addl_methods);
1886     }
1887   }
1888 };
1889 
1890 class JNIMethodBlock : public CHeapObj<mtClass> {
1891   JNIMethodBlockNode _head;
1892   JNIMethodBlockNode *_last_free;
1893  public:
1894   static Method* const _free_method;
1895 
1896   JNIMethodBlock(int initial_capacity = min_block_size)
1897       : _head(initial_capacity), _last_free(&_head) {}
1898 
1899   void ensure_methods(int num_addl_methods) {
1900     _last_free->ensure_methods(num_addl_methods);
1901   }
1902 
1903   Method** add_method(Method* m) {
1904     for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1905       if (b->_top < b->_number_of_methods) {
1906         // top points to the next free entry.
1907         int i = b->_top;
1908         b->_methods[i] = m;
1909         b->_top++;
1910         _last_free = b;
1911         return &(b->_methods[i]);
1912       } else if (b->_top == b->_number_of_methods) {
1913         // if the next free entry ran off the block see if there's a free entry
1914         for (int i = 0; i < b->_number_of_methods; i++) {
1915           if (b->_methods[i] == _free_method) {
1916             b->_methods[i] = m;
1917             _last_free = b;
1918             return &(b->_methods[i]);
1919           }
1920         }
1921         // Only check each block once for frees.  They're very unlikely.
1922         // Increment top past the end of the block.
1923         b->_top++;
1924       }
1925       // need to allocate a next block.
1926       if (b->_next == NULL) {
1927         b->_next = _last_free = new JNIMethodBlockNode();
1928       }
1929     }
1930     guarantee(false, "Should always allocate a free block");
1931     return NULL;
1932   }
1933 
1934   bool contains(Method** m) {
1935     if (m == NULL) return false;
1936     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1937       if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
1938         // This is a bit of extra checking, for two reasons.  One is
1939         // that contains() deals with pointers that are passed in by
1940         // JNI code, so making sure that the pointer is aligned
1941         // correctly is valuable.  The other is that <= and > are
1942         // technically not defined on pointers, so the if guard can
1943         // pass spuriously; no modern compiler is likely to make that
1944         // a problem, though (and if one did, the guard could also
1945         // fail spuriously, which would be bad).
1946         ptrdiff_t idx = m - b->_methods;
1947         if (b->_methods + idx == m) {
1948           return true;
1949         }
1950       }
1951     }
1952     return false;  // not found
1953   }
1954 
1955   // Doesn't really destroy it, just marks it as free so it can be reused.
1956   void destroy_method(Method** m) {
1957 #ifdef ASSERT
1958     assert(contains(m), "should be a methodID");
1959 #endif // ASSERT
1960     *m = _free_method;
1961   }
1962 
1963   // During class unloading the methods are cleared, which is different
1964   // than freed.
1965   void clear_all_methods() {
1966     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1967       for (int i = 0; i< b->_number_of_methods; i++) {
1968         b->_methods[i] = NULL;
1969       }
1970     }
1971   }
1972 #ifndef PRODUCT
1973   int count_methods() {
1974     // count all allocated methods
1975     int count = 0;
1976     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
1977       for (int i = 0; i< b->_number_of_methods; i++) {
1978         if (b->_methods[i] != _free_method) count++;
1979       }
1980     }
1981     return count;
1982   }
1983 #endif // PRODUCT
1984 };
1985 
1986 // Something that can't be mistaken for an address or a markOop
1987 Method* const JNIMethodBlock::_free_method = (Method*)55;
1988 
1989 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
1990   _number_of_methods = MAX2(num_methods, min_block_size);
1991   _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
1992   for (int i = 0; i < _number_of_methods; i++) {
1993     _methods[i] = JNIMethodBlock::_free_method;
1994   }
1995 }
1996 
1997 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
1998   ClassLoaderData* cld = loader_data;
1999   if (!SafepointSynchronize::is_at_safepoint()) {
2000     // Have to add jmethod_ids() to class loader data thread-safely.
2001     // Also have to add the method to the list safely, which the cld lock
2002     // protects as well.
2003     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2004     if (cld->jmethod_ids() == NULL) {
2005       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2006     } else {
2007       cld->jmethod_ids()->ensure_methods(capacity);
2008     }
2009   } else {
2010     // At safepoint, we are single threaded and can set this.
2011     if (cld->jmethod_ids() == NULL) {
2012       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2013     } else {
2014       cld->jmethod_ids()->ensure_methods(capacity);
2015     }
2016   }
2017 }
2018 
2019 // Add a method id to the jmethod_ids
2020 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2021   ClassLoaderData* cld = loader_data;
2022 
2023   if (!SafepointSynchronize::is_at_safepoint()) {
2024     // Have to add jmethod_ids() to class loader data thread-safely.
2025     // Also have to add the method to the list safely, which the cld lock
2026     // protects as well.
2027     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2028     if (cld->jmethod_ids() == NULL) {
2029       cld->set_jmethod_ids(new JNIMethodBlock());
2030     }
2031     // jmethodID is a pointer to Method*
2032     return (jmethodID)cld->jmethod_ids()->add_method(m);
2033   } else {
2034     // At safepoint, we are single threaded and can set this.
2035     if (cld->jmethod_ids() == NULL) {
2036       cld->set_jmethod_ids(new JNIMethodBlock());
2037     }
2038     // jmethodID is a pointer to Method*
2039     return (jmethodID)cld->jmethod_ids()->add_method(m);
2040   }
2041 }
2042 
2043 // Mark a jmethodID as free.  This is called when there is a data race in
2044 // InstanceKlass while creating the jmethodID cache.
2045 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2046   ClassLoaderData* cld = loader_data;
2047   Method** ptr = (Method**)m;
2048   assert(cld->jmethod_ids() != NULL, "should have method handles");
2049   cld->jmethod_ids()->destroy_method(ptr);
2050 }
2051 
2052 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2053   // Can't assert the method_holder is the same because the new method has the
2054   // scratch method holder.
2055   assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2056            == new_method->method_holder()->class_loader(),
2057          "changing to a different class loader");
2058   // Just change the method in place, jmethodID pointer doesn't change.
2059   *((Method**)jmid) = new_method;
2060 }
2061 
2062 bool Method::is_method_id(jmethodID mid) {
2063   Method* m = resolve_jmethod_id(mid);
2064   assert(m != NULL, "should be called with non-null method");
2065   InstanceKlass* ik = m->method_holder();
2066   ClassLoaderData* cld = ik->class_loader_data();
2067   if (cld->jmethod_ids() == NULL) return false;
2068   return (cld->jmethod_ids()->contains((Method**)mid));
2069 }
2070 
2071 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2072   if (mid == NULL) return NULL;
2073   Method* o = resolve_jmethod_id(mid);
2074   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2075     return NULL;
2076   }
2077   return o;
2078 };
2079 
2080 void Method::set_on_stack(const bool value) {
2081   // Set both the method itself and its constant pool.  The constant pool
2082   // on stack means some method referring to it is also on the stack.
2083   constants()->set_on_stack(value);
2084 
2085   bool already_set = on_stack();
2086   _access_flags.set_on_stack(value);
2087   if (value && !already_set) {
2088     MetadataOnStackMark::record(this);
2089   }
2090 }
2091 
2092 // Called when the class loader is unloaded to make all methods weak.
2093 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2094   loader_data->jmethod_ids()->clear_all_methods();
2095 }
2096 
2097 bool Method::has_method_vptr(const void* ptr) {
2098   Method m;
2099   // This assumes that the vtbl pointer is the first word of a C++ object.
2100   // This assumption is also in universe.cpp patch_klass_vtble
2101   void* vtbl2 = dereference_vptr((const void*)&m);
2102   void* this_vtbl = dereference_vptr(ptr);
2103   return vtbl2 == this_vtbl;
2104 }
2105 
2106 // Check that this pointer is valid by checking that the vtbl pointer matches
2107 bool Method::is_valid_method() const {
2108   if (this == NULL) {
2109     return false;
2110   } else if (!is_metaspace_object()) {
2111     return false;
2112   } else {
2113     return has_method_vptr((const void*)this);
2114   }
2115 }
2116 
2117 #ifndef PRODUCT
2118 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2119   out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2120 }
2121 #endif // PRODUCT
2122 
2123 
2124 // Printing
2125 
2126 #ifndef PRODUCT
2127 
2128 void Method::print_on(outputStream* st) const {
2129   ResourceMark rm;
2130   assert(is_method(), "must be method");
2131   st->print_cr("%s", internal_name());
2132   // get the effect of PrintOopAddress, always, for methods:
2133   st->print_cr(" - this oop:          " INTPTR_FORMAT, p2i(this));
2134   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
2135   st->print   (" - constants:         " INTPTR_FORMAT " ", p2i(constants()));
2136   constants()->print_value_on(st); st->cr();
2137   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2138   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
2139   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
2140   st->print_cr(" - max stack:         %d",   max_stack());
2141   st->print_cr(" - max locals:        %d",   max_locals());
2142   st->print_cr(" - size of params:    %d",   size_of_parameters());
2143   st->print_cr(" - method size:       %d",   method_size());
2144   if (intrinsic_id() != vmIntrinsics::_none)
2145     st->print_cr(" - intrinsic id:      %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2146   if (highest_comp_level() != CompLevel_none)
2147     st->print_cr(" - highest level:     %d", highest_comp_level());
2148   st->print_cr(" - vtable index:      %d",   _vtable_index);
2149   st->print_cr(" - i2i entry:         " INTPTR_FORMAT, p2i(interpreter_entry()));
2150   st->print(   " - adapters:          ");
2151   AdapterHandlerEntry* a = ((Method*)this)->adapter();
2152   if (a == NULL)
2153     st->print_cr(INTPTR_FORMAT, p2i(a));
2154   else
2155     a->print_adapter_on(st);
2156   st->print_cr(" - compiled entry     " INTPTR_FORMAT, p2i(from_compiled_entry()));
2157   st->print_cr(" - code size:         %d",   code_size());
2158   if (code_size() != 0) {
2159     st->print_cr(" - code start:        " INTPTR_FORMAT, p2i(code_base()));
2160     st->print_cr(" - code end (excl):   " INTPTR_FORMAT, p2i(code_base() + code_size()));
2161   }
2162   if (method_data() != NULL) {
2163     st->print_cr(" - method data:       " INTPTR_FORMAT, p2i(method_data()));
2164   }
2165   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
2166   if (checked_exceptions_length() > 0) {
2167     CheckedExceptionElement* table = checked_exceptions_start();
2168     st->print_cr(" - checked ex start:  " INTPTR_FORMAT, p2i(table));
2169     if (Verbose) {
2170       for (int i = 0; i < checked_exceptions_length(); i++) {
2171         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2172       }
2173     }
2174   }
2175   if (has_linenumber_table()) {
2176     u_char* table = compressed_linenumber_table();
2177     st->print_cr(" - linenumber start:  " INTPTR_FORMAT, p2i(table));
2178     if (Verbose) {
2179       CompressedLineNumberReadStream stream(table);
2180       while (stream.read_pair()) {
2181         st->print_cr("   - line %d: %d", stream.line(), stream.bci());
2182       }
2183     }
2184   }
2185   st->print_cr(" - localvar length:   %d",   localvariable_table_length());
2186   if (localvariable_table_length() > 0) {
2187     LocalVariableTableElement* table = localvariable_table_start();
2188     st->print_cr(" - localvar start:    " INTPTR_FORMAT, p2i(table));
2189     if (Verbose) {
2190       for (int i = 0; i < localvariable_table_length(); i++) {
2191         int bci = table[i].start_bci;
2192         int len = table[i].length;
2193         const char* name = constants()->printable_name_at(table[i].name_cp_index);
2194         const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2195         int slot = table[i].slot;
2196         st->print_cr("   - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2197       }
2198     }
2199   }
2200   if (code() != NULL) {
2201     st->print   (" - compiled code: ");
2202     code()->print_value_on(st);
2203   }
2204   if (is_native()) {
2205     st->print_cr(" - native function:   " INTPTR_FORMAT, p2i(native_function()));
2206     st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2207   }
2208 }
2209 
2210 void Method::print_linkage_flags(outputStream* st) {
2211   access_flags().print_on(st);
2212   if (is_default_method()) {
2213     st->print("default ");
2214   }
2215   if (is_overpass()) {
2216     st->print("overpass ");
2217   }
2218 }
2219 #endif //PRODUCT
2220 
2221 void Method::print_value_on(outputStream* st) const {
2222   assert(is_method(), "must be method");
2223   st->print("%s", internal_name());
2224   print_address_on(st);
2225   st->print(" ");
2226   name()->print_value_on(st);
2227   st->print(" ");
2228   signature()->print_value_on(st);
2229   st->print(" in ");
2230   method_holder()->print_value_on(st);
2231   if (WizardMode) st->print("#%d", _vtable_index);
2232   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2233   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2234 }
2235 
2236 #if INCLUDE_SERVICES
2237 // Size Statistics
2238 void Method::collect_statistics(KlassSizeStats *sz) const {
2239   int mysize = sz->count(this);
2240   sz->_method_bytes += mysize;
2241   sz->_method_all_bytes += mysize;
2242   sz->_rw_bytes += mysize;
2243 
2244   if (constMethod()) {
2245     constMethod()->collect_statistics(sz);
2246   }
2247   if (method_data()) {
2248     method_data()->collect_statistics(sz);
2249   }
2250 }
2251 #endif // INCLUDE_SERVICES
2252 
2253 // LogTouchedMethods and PrintTouchedMethods
2254 
2255 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2256 // the Method may be garbage collected. Let's roll our own hash table.
2257 class TouchedMethodRecord : CHeapObj<mtTracing> {
2258 public:
2259   // It's OK to store Symbols here because they will NOT be GC'ed if
2260   // LogTouchedMethods is enabled.
2261   TouchedMethodRecord* _next;
2262   Symbol* _class_name;
2263   Symbol* _method_name;
2264   Symbol* _method_signature;
2265 };
2266 
2267 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2268 static TouchedMethodRecord** _touched_method_table = NULL;
2269 
2270 void Method::log_touched(TRAPS) {
2271 
2272   const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2273   Symbol* my_class = klass_name();
2274   Symbol* my_name  = name();
2275   Symbol* my_sig   = signature();
2276 
2277   unsigned int hash = my_class->identity_hash() +
2278                       my_name->identity_hash() +
2279                       my_sig->identity_hash();
2280   juint index = juint(hash) % table_size;
2281 
2282   MutexLocker ml(TouchedMethodLog_lock, THREAD);
2283   if (_touched_method_table == NULL) {
2284     _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2285                                               mtTracing, CURRENT_PC);
2286     memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2287   }
2288 
2289   TouchedMethodRecord* ptr = _touched_method_table[index];
2290   while (ptr) {
2291     if (ptr->_class_name       == my_class &&
2292         ptr->_method_name      == my_name &&
2293         ptr->_method_signature == my_sig) {
2294       return;
2295     }
2296     if (ptr->_next == NULL) break;
2297     ptr = ptr->_next;
2298   }
2299   TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2300   my_class->set_permanent();  // prevent reclaimed by GC
2301   my_name->set_permanent();
2302   my_sig->set_permanent();
2303   nptr->_class_name         = my_class;
2304   nptr->_method_name        = my_name;
2305   nptr->_method_signature   = my_sig;
2306   nptr->_next               = NULL;
2307 
2308   if (ptr == NULL) {
2309     // first
2310     _touched_method_table[index] = nptr;
2311   } else {
2312     ptr->_next = nptr;
2313   }
2314 }
2315 
2316 void Method::print_touched_methods(outputStream* out) {
2317   MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2318   out->print_cr("# Method::print_touched_methods version 1");
2319   if (_touched_method_table) {
2320     for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2321       TouchedMethodRecord* ptr = _touched_method_table[i];
2322       while(ptr) {
2323         ptr->_class_name->print_symbol_on(out);       out->print(".");
2324         ptr->_method_name->print_symbol_on(out);      out->print(":");
2325         ptr->_method_signature->print_symbol_on(out); out->cr();
2326         ptr = ptr->_next;
2327       }
2328     }
2329   }
2330 }
2331 
2332 // Verification
2333 
2334 void Method::verify_on(outputStream* st) {
2335   guarantee(is_method(), "object must be method");
2336   guarantee(constants()->is_constantPool(), "should be constant pool");
2337   guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2338   MethodData* md = method_data();
2339   guarantee(md == NULL ||
2340       md->is_methodData(), "should be method data");
2341 }