1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/metadataOnStackMark.hpp"
  27 #include "classfile/systemDictionary.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "code/debugInfoRec.hpp"
  30 #include "gc/shared/collectedHeap.inline.hpp"
  31 #include "gc/shared/gcLocker.hpp"
  32 #include "gc/shared/generation.hpp"
  33 #include "interpreter/bytecodeStream.hpp"
  34 #include "interpreter/bytecodeTracer.hpp"
  35 #include "interpreter/bytecodes.hpp"
  36 #include "interpreter/interpreter.hpp"
  37 #include "interpreter/oopMapCache.hpp"
  38 #include "memory/heapInspection.hpp"
  39 #include "memory/metadataFactory.hpp"
  40 #include "memory/metaspaceClosure.hpp"
  41 #include "memory/metaspaceShared.hpp"
  42 #include "memory/oopFactory.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "oops/constMethod.hpp"
  45 #include "oops/method.hpp"
  46 #include "oops/methodData.hpp"
  47 #include "oops/objArrayOop.inline.hpp"
  48 #include "oops/oop.inline.hpp"
  49 #include "oops/symbol.hpp"
  50 #include "prims/jvmtiExport.hpp"
  51 #include "prims/methodHandles.hpp"
  52 #include "prims/nativeLookup.hpp"
  53 #include "runtime/arguments.hpp"
  54 #include "runtime/compilationPolicy.hpp"
  55 #include "runtime/frame.inline.hpp"
  56 #include "runtime/handles.inline.hpp"
  57 #include "runtime/init.hpp"
  58 #include "runtime/orderAccess.inline.hpp"
  59 #include "runtime/relocator.hpp"
  60 #include "runtime/sharedRuntime.hpp"
  61 #include "runtime/signature.hpp"
  62 #include "utilities/align.hpp"
  63 #include "utilities/quickSort.hpp"
  64 #include "utilities/vmError.hpp"
  65 #include "utilities/xmlstream.hpp"
  66 
  67 // Implementation of Method
  68 
  69 Method* Method::allocate(ClassLoaderData* loader_data,
  70                          int byte_code_size,
  71                          AccessFlags access_flags,
  72                          InlineTableSizes* sizes,
  73                          ConstMethod::MethodType method_type,
  74                          TRAPS) {
  75   assert(!access_flags.is_native() || byte_code_size == 0,
  76          "native methods should not contain byte codes");
  77   ConstMethod* cm = ConstMethod::allocate(loader_data,
  78                                           byte_code_size,
  79                                           sizes,
  80                                           method_type,
  81                                           CHECK_NULL);
  82   int size = Method::size(access_flags.is_native());
  83   return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
  84 }
  85 
  86 Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
  87   NoSafepointVerifier no_safepoint;
  88   set_constMethod(xconst);
  89   set_access_flags(access_flags);
  90   set_intrinsic_id(vmIntrinsics::_none);
  91   set_force_inline(false);
  92   set_hidden(false);
  93   set_dont_inline(false);
  94   set_has_injected_profile(false);
  95   set_method_data(NULL);
  96   clear_method_counters();
  97   set_vtable_index(Method::garbage_vtable_index);
  98 
  99   // Fix and bury in Method*
 100   set_interpreter_entry(NULL); // sets i2i entry and from_int
 101   set_adapter_entry(NULL);
 102   clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i
 103 
 104   if (access_flags.is_native()) {
 105     clear_native_function();
 106     set_signature_handler(NULL);
 107   }
 108 
 109   NOT_PRODUCT(set_compiled_invocation_count(0);)
 110 }
 111 
 112 // Release Method*.  The nmethod will be gone when we get here because
 113 // we've walked the code cache.
 114 void Method::deallocate_contents(ClassLoaderData* loader_data) {
 115   MetadataFactory::free_metadata(loader_data, constMethod());
 116   set_constMethod(NULL);
 117   MetadataFactory::free_metadata(loader_data, method_data());
 118   set_method_data(NULL);
 119   MetadataFactory::free_metadata(loader_data, method_counters());
 120   clear_method_counters();
 121   // The nmethod will be gone when we get here.
 122   if (code() != NULL) _code = NULL;
 123 }
 124 
 125 address Method::get_i2c_entry() {
 126   assert(adapter() != NULL, "must have");
 127   return adapter()->get_i2c_entry();
 128 }
 129 
 130 address Method::get_c2i_entry() {
 131   assert(adapter() != NULL, "must have");
 132   return adapter()->get_c2i_entry();
 133 }
 134 
 135 address Method::get_c2i_unverified_entry() {
 136   assert(adapter() != NULL, "must have");
 137   return adapter()->get_c2i_unverified_entry();
 138 }
 139 
 140 char* Method::name_and_sig_as_C_string() const {
 141   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
 142 }
 143 
 144 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
 145   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
 146 }
 147 
 148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
 149   const char* klass_name = klass->external_name();
 150   int klass_name_len  = (int)strlen(klass_name);
 151   int method_name_len = method_name->utf8_length();
 152   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();
 153   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);
 154   strcpy(dest, klass_name);
 155   dest[klass_name_len] = '.';
 156   strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
 157   strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
 158   dest[len] = 0;
 159   return dest;
 160 }
 161 
 162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
 163   Symbol* klass_name = klass->name();
 164   klass_name->as_klass_external_name(buf, size);
 165   int len = (int)strlen(buf);
 166 
 167   if (len < size - 1) {
 168     buf[len++] = '.';
 169 
 170     method_name->as_C_string(&(buf[len]), size - len);
 171     len = (int)strlen(buf);
 172 
 173     signature->as_C_string(&(buf[len]), size - len);
 174   }
 175 
 176   return buf;
 177 }
 178 
 179 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) {
 180   // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
 181   // access exception table
 182   ExceptionTable table(mh());
 183   int length = table.length();
 184   // iterate through all entries sequentially
 185   constantPoolHandle pool(THREAD, mh->constants());
 186   for (int i = 0; i < length; i ++) {
 187     //reacquire the table in case a GC happened
 188     ExceptionTable table(mh());
 189     int beg_bci = table.start_pc(i);
 190     int end_bci = table.end_pc(i);
 191     assert(beg_bci <= end_bci, "inconsistent exception table");
 192     if (beg_bci <= throw_bci && throw_bci < end_bci) {
 193       // exception handler bci range covers throw_bci => investigate further
 194       int handler_bci = table.handler_pc(i);
 195       int klass_index = table.catch_type_index(i);
 196       if (klass_index == 0) {
 197         return handler_bci;
 198       } else if (ex_klass == NULL) {
 199         return handler_bci;
 200       } else {
 201         // we know the exception class => get the constraint class
 202         // this may require loading of the constraint class; if verification
 203         // fails or some other exception occurs, return handler_bci
 204         Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
 205         assert(k != NULL, "klass not loaded");
 206         if (ex_klass->is_subtype_of(k)) {
 207           return handler_bci;
 208         }
 209       }
 210     }
 211   }
 212 
 213   return -1;
 214 }
 215 
 216 void Method::mask_for(int bci, InterpreterOopMap* mask) {
 217   methodHandle h_this(Thread::current(), this);
 218   // Only GC uses the OopMapCache during thread stack root scanning
 219   // any other uses generate an oopmap but do not save it in the cache.
 220   if (Universe::heap()->is_gc_active()) {
 221     method_holder()->mask_for(h_this, bci, mask);
 222   } else {
 223     OopMapCache::compute_one_oop_map(h_this, bci, mask);
 224   }
 225   return;
 226 }
 227 
 228 
 229 int Method::bci_from(address bcp) const {
 230   if (is_native() && bcp == 0) {
 231     return 0;
 232   }
 233 #ifdef ASSERT
 234   {
 235     ResourceMark rm;
 236     if (!((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported()))
 237       tty->print("Oops!");
 238     assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(),
 239            "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s",
 240            p2i(bcp), name_and_sig_as_C_string());
 241   }
 242 #endif
 243   return bcp - code_base();
 244 }
 245 
 246 
 247 int Method::validate_bci(int bci) const {
 248   return (bci == 0 || bci < code_size()) ? bci : -1;
 249 }
 250 
 251 // Return bci if it appears to be a valid bcp
 252 // Return -1 otherwise.
 253 // Used by profiling code, when invalid data is a possibility.
 254 // The caller is responsible for validating the Method* itself.
 255 int Method::validate_bci_from_bcp(address bcp) const {
 256   // keep bci as -1 if not a valid bci
 257   int bci = -1;
 258   if (bcp == 0 || bcp == code_base()) {
 259     // code_size() may return 0 and we allow 0 here
 260     // the method may be native
 261     bci = 0;
 262   } else if (contains(bcp)) {
 263     bci = bcp - code_base();
 264   }
 265   // Assert that if we have dodged any asserts, bci is negative.
 266   assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
 267   return bci;
 268 }
 269 
 270 address Method::bcp_from(int bci) const {
 271   assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()),
 272          "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native");
 273   address bcp = code_base() + bci;
 274   assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
 275   return bcp;
 276 }
 277 
 278 address Method::bcp_from(address bcp) const {
 279   if (is_native() && bcp == NULL) {
 280     return code_base();
 281   } else {
 282     return bcp;
 283   }
 284 }
 285 
 286 int Method::size(bool is_native) {
 287   // If native, then include pointers for native_function and signature_handler
 288   int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
 289   int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
 290   return align_metadata_size(header_size() + extra_words);
 291 }
 292 
 293 
 294 Symbol* Method::klass_name() const {
 295   return method_holder()->name();
 296 }
 297 
 298 
 299 void Method::metaspace_pointers_do(MetaspaceClosure* it) {
 300   log_trace(cds)("Iter(Method): %p", this);
 301 
 302   it->push(&_constMethod);
 303   it->push(&_method_data);
 304   it->push(&_method_counters);
 305 }
 306 
 307 // Attempt to return method oop to original state.  Clear any pointers
 308 // (to objects outside the shared spaces).  We won't be able to predict
 309 // where they should point in a new JVM.  Further initialize some
 310 // entries now in order allow them to be write protected later.
 311 
 312 void Method::remove_unshareable_info() {
 313   unlink_method();
 314 }
 315 
 316 void Method::set_vtable_index(int index) {
 317   if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
 318     // At runtime initialize_vtable is rerun as part of link_class_impl()
 319     // for a shared class loaded by the non-boot loader to obtain the loader
 320     // constraints based on the runtime classloaders' context.
 321     return; // don't write into the shared class
 322   } else {
 323     _vtable_index = index;
 324   }
 325 }
 326 
 327 void Method::set_itable_index(int index) {
 328   if (is_shared() && !MetaspaceShared::remapped_readwrite()) {
 329     // At runtime initialize_itable is rerun as part of link_class_impl()
 330     // for a shared class loaded by the non-boot loader to obtain the loader
 331     // constraints based on the runtime classloaders' context. The dumptime
 332     // itable index should be the same as the runtime index.
 333     assert(_vtable_index == itable_index_max - index,
 334            "archived itable index is different from runtime index");
 335     return; // don’t write into the shared class
 336   } else {
 337     _vtable_index = itable_index_max - index;
 338   }
 339   assert(valid_itable_index(), "");
 340 }
 341 
 342 
 343 
 344 bool Method::was_executed_more_than(int n) {
 345   // Invocation counter is reset when the Method* is compiled.
 346   // If the method has compiled code we therefore assume it has
 347   // be excuted more than n times.
 348   if (is_accessor() || is_empty_method() || (code() != NULL)) {
 349     // interpreter doesn't bump invocation counter of trivial methods
 350     // compiler does not bump invocation counter of compiled methods
 351     return true;
 352   }
 353   else if ((method_counters() != NULL &&
 354             method_counters()->invocation_counter()->carry()) ||
 355            (method_data() != NULL &&
 356             method_data()->invocation_counter()->carry())) {
 357     // The carry bit is set when the counter overflows and causes
 358     // a compilation to occur.  We don't know how many times
 359     // the counter has been reset, so we simply assume it has
 360     // been executed more than n times.
 361     return true;
 362   } else {
 363     return invocation_count() > n;
 364   }
 365 }
 366 
 367 void Method::print_invocation_count() {
 368   if (is_static()) tty->print("static ");
 369   if (is_final()) tty->print("final ");
 370   if (is_synchronized()) tty->print("synchronized ");
 371   if (is_native()) tty->print("native ");
 372   tty->print("%s::", method_holder()->external_name());
 373   name()->print_symbol_on(tty);
 374   signature()->print_symbol_on(tty);
 375 
 376   if (WizardMode) {
 377     // dump the size of the byte codes
 378     tty->print(" {%d}", code_size());
 379   }
 380   tty->cr();
 381 
 382   tty->print_cr ("  interpreter_invocation_count: %8d ", interpreter_invocation_count());
 383   tty->print_cr ("  invocation_counter:           %8d ", invocation_count());
 384   tty->print_cr ("  backedge_counter:             %8d ", backedge_count());
 385 #ifndef PRODUCT
 386   if (CountCompiledCalls) {
 387     tty->print_cr ("  compiled_invocation_count: %8d ", compiled_invocation_count());
 388   }
 389 #endif
 390 }
 391 
 392 // Build a MethodData* object to hold information about this method
 393 // collected in the interpreter.
 394 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) {
 395   // Do not profile the method if metaspace has hit an OOM previously
 396   // allocating profiling data. Callers clear pending exception so don't
 397   // add one here.
 398   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 399     return;
 400   }
 401 
 402   // Grab a lock here to prevent multiple
 403   // MethodData*s from being created.
 404   MutexLocker ml(MethodData_lock, THREAD);
 405   if (method->method_data() == NULL) {
 406     ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
 407     MethodData* method_data = MethodData::allocate(loader_data, method, THREAD);
 408     if (HAS_PENDING_EXCEPTION) {
 409       CompileBroker::log_metaspace_failure();
 410       ClassLoaderDataGraph::set_metaspace_oom(true);
 411       return;   // return the exception (which is cleared)
 412     }
 413 
 414     method->set_method_data(method_data);
 415     if (PrintMethodData && (Verbose || WizardMode)) {
 416       ResourceMark rm(THREAD);
 417       tty->print("build_interpreter_method_data for ");
 418       method->print_name(tty);
 419       tty->cr();
 420       // At the end of the run, the MDO, full of data, will be dumped.
 421     }
 422   }
 423 }
 424 
 425 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
 426   // Do not profile the method if metaspace has hit an OOM previously
 427   if (ClassLoaderDataGraph::has_metaspace_oom()) {
 428     return NULL;
 429   }
 430 
 431   methodHandle mh(m);
 432   MethodCounters* counters = MethodCounters::allocate(mh, THREAD);
 433   if (HAS_PENDING_EXCEPTION) {
 434     CompileBroker::log_metaspace_failure();
 435     ClassLoaderDataGraph::set_metaspace_oom(true);
 436     return NULL;   // return the exception (which is cleared)
 437   }
 438   if (!mh->init_method_counters(counters)) {
 439     MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters);
 440   }
 441 
 442   if (LogTouchedMethods) {
 443     mh->log_touched(CHECK_NULL);
 444   }
 445 
 446   return mh->method_counters();
 447 }
 448 
 449 void Method::cleanup_inline_caches() {
 450   // The current system doesn't use inline caches in the interpreter
 451   // => nothing to do (keep this method around for future use)
 452 }
 453 
 454 
 455 int Method::extra_stack_words() {
 456   // not an inline function, to avoid a header dependency on Interpreter
 457   return extra_stack_entries() * Interpreter::stackElementSize;
 458 }
 459 
 460 
 461 void Method::compute_size_of_parameters(Thread *thread) {
 462   ArgumentSizeComputer asc(signature());
 463   set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
 464 }
 465 
 466 BasicType Method::result_type() const {
 467   ResultTypeFinder rtf(signature());
 468   return rtf.type();
 469 }
 470 
 471 
 472 bool Method::is_empty_method() const {
 473   return  code_size() == 1
 474       && *code_base() == Bytecodes::_return;
 475 }
 476 
 477 
 478 bool Method::is_vanilla_constructor() const {
 479   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
 480   // which only calls the superclass vanilla constructor and possibly does stores of
 481   // zero constants to local fields:
 482   //
 483   //   aload_0
 484   //   invokespecial
 485   //   indexbyte1
 486   //   indexbyte2
 487   //
 488   // followed by an (optional) sequence of:
 489   //
 490   //   aload_0
 491   //   aconst_null / iconst_0 / fconst_0 / dconst_0
 492   //   putfield
 493   //   indexbyte1
 494   //   indexbyte2
 495   //
 496   // followed by:
 497   //
 498   //   return
 499 
 500   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
 501   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
 502   int size = code_size();
 503   // Check if size match
 504   if (size == 0 || size % 5 != 0) return false;
 505   address cb = code_base();
 506   int last = size - 1;
 507   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
 508     // Does not call superclass default constructor
 509     return false;
 510   }
 511   // Check optional sequence
 512   for (int i = 4; i < last; i += 5) {
 513     if (cb[i] != Bytecodes::_aload_0) return false;
 514     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
 515     if (cb[i+2] != Bytecodes::_putfield) return false;
 516   }
 517   return true;
 518 }
 519 
 520 
 521 bool Method::compute_has_loops_flag() {
 522   BytecodeStream bcs(this);
 523   Bytecodes::Code bc;
 524 
 525   while ((bc = bcs.next()) >= 0) {
 526     switch( bc ) {
 527       case Bytecodes::_ifeq:
 528       case Bytecodes::_ifnull:
 529       case Bytecodes::_iflt:
 530       case Bytecodes::_ifle:
 531       case Bytecodes::_ifne:
 532       case Bytecodes::_ifnonnull:
 533       case Bytecodes::_ifgt:
 534       case Bytecodes::_ifge:
 535       case Bytecodes::_if_icmpeq:
 536       case Bytecodes::_if_icmpne:
 537       case Bytecodes::_if_icmplt:
 538       case Bytecodes::_if_icmpgt:
 539       case Bytecodes::_if_icmple:
 540       case Bytecodes::_if_icmpge:
 541       case Bytecodes::_if_acmpeq:
 542       case Bytecodes::_if_acmpne:
 543       case Bytecodes::_goto:
 544       case Bytecodes::_jsr:
 545         if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
 546         break;
 547 
 548       case Bytecodes::_goto_w:
 549       case Bytecodes::_jsr_w:
 550         if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
 551         break;
 552 
 553       default:
 554         break;
 555     }
 556   }
 557   _access_flags.set_loops_flag_init();
 558   return _access_flags.has_loops();
 559 }
 560 
 561 bool Method::is_final_method(AccessFlags class_access_flags) const {
 562   // or "does_not_require_vtable_entry"
 563   // default method or overpass can occur, is not final (reuses vtable entry)
 564   // private methods in classes get vtable entries for backward class compatibility.
 565   if (is_overpass() || is_default_method())  return false;
 566   return is_final() || class_access_flags.is_final();
 567 }
 568 
 569 bool Method::is_final_method() const {
 570   return is_final_method(method_holder()->access_flags());
 571 }
 572 
 573 bool Method::is_default_method() const {
 574   if (method_holder() != NULL &&
 575       method_holder()->is_interface() &&
 576       !is_abstract() && !is_private()) {
 577     return true;
 578   } else {
 579     return false;
 580   }
 581 }
 582 
 583 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
 584   if (is_final_method(class_access_flags))  return true;
 585 #ifdef ASSERT
 586   ResourceMark rm;
 587   bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
 588   if (class_access_flags.is_interface()) {
 589       assert(is_nonv == is_static() || is_nonv == is_private(),
 590              "nonvirtual unexpected for non-static, non-private: %s",
 591              name_and_sig_as_C_string());
 592   }
 593 #endif
 594   assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
 595   return vtable_index() == nonvirtual_vtable_index;
 596 }
 597 
 598 bool Method::can_be_statically_bound() const {
 599   return can_be_statically_bound(method_holder()->access_flags());
 600 }
 601 
 602 bool Method::is_accessor() const {
 603   return is_getter() || is_setter();
 604 }
 605 
 606 bool Method::is_getter() const {
 607   if (code_size() != 5) return false;
 608   if (size_of_parameters() != 1) return false;
 609   if (java_code_at(0) != Bytecodes::_aload_0)  return false;
 610   if (java_code_at(1) != Bytecodes::_getfield) return false;
 611   switch (java_code_at(4)) {
 612     case Bytecodes::_ireturn:
 613     case Bytecodes::_lreturn:
 614     case Bytecodes::_freturn:
 615     case Bytecodes::_dreturn:
 616     case Bytecodes::_areturn:
 617       break;
 618     default:
 619       return false;
 620   }
 621   return true;
 622 }
 623 
 624 bool Method::is_setter() const {
 625   if (code_size() != 6) return false;
 626   if (java_code_at(0) != Bytecodes::_aload_0) return false;
 627   switch (java_code_at(1)) {
 628     case Bytecodes::_iload_1:
 629     case Bytecodes::_aload_1:
 630     case Bytecodes::_fload_1:
 631       if (size_of_parameters() != 2) return false;
 632       break;
 633     case Bytecodes::_dload_1:
 634     case Bytecodes::_lload_1:
 635       if (size_of_parameters() != 3) return false;
 636       break;
 637     default:
 638       return false;
 639   }
 640   if (java_code_at(2) != Bytecodes::_putfield) return false;
 641   if (java_code_at(5) != Bytecodes::_return)   return false;
 642   return true;
 643 }
 644 
 645 bool Method::is_constant_getter() const {
 646   int last_index = code_size() - 1;
 647   // Check if the first 1-3 bytecodes are a constant push
 648   // and the last bytecode is a return.
 649   return (2 <= code_size() && code_size() <= 4 &&
 650           Bytecodes::is_const(java_code_at(0)) &&
 651           Bytecodes::length_for(java_code_at(0)) == last_index &&
 652           Bytecodes::is_return(java_code_at(last_index)));
 653 }
 654 
 655 bool Method::is_initializer() const {
 656   return is_object_initializer() || is_static_initializer();
 657 }
 658 
 659 bool Method::has_valid_initializer_flags() const {
 660   return (is_static() ||
 661           method_holder()->major_version() < 51);
 662 }
 663 
 664 bool Method::is_static_initializer() const {
 665   // For classfiles version 51 or greater, ensure that the clinit method is
 666   // static.  Non-static methods with the name "<clinit>" are not static
 667   // initializers. (older classfiles exempted for backward compatibility)
 668   return name() == vmSymbols::class_initializer_name() &&
 669          has_valid_initializer_flags();
 670 }
 671 
 672 bool Method::is_object_initializer() const {
 673    return name() == vmSymbols::object_initializer_name();
 674 }
 675 
 676 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
 677   int length = method->checked_exceptions_length();
 678   if (length == 0) {  // common case
 679     return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
 680   } else {
 681     methodHandle h_this(THREAD, method);
 682     objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
 683     objArrayHandle mirrors (THREAD, m_oop);
 684     for (int i = 0; i < length; i++) {
 685       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
 686       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
 687       assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
 688       mirrors->obj_at_put(i, k->java_mirror());
 689     }
 690     return mirrors;
 691   }
 692 };
 693 
 694 
 695 int Method::line_number_from_bci(int bci) const {
 696   if (bci == SynchronizationEntryBCI) bci = 0;
 697   assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
 698   int best_bci  =  0;
 699   int best_line = -1;
 700 
 701   if (has_linenumber_table()) {
 702     // The line numbers are a short array of 2-tuples [start_pc, line_number].
 703     // Not necessarily sorted and not necessarily one-to-one.
 704     CompressedLineNumberReadStream stream(compressed_linenumber_table());
 705     while (stream.read_pair()) {
 706       if (stream.bci() == bci) {
 707         // perfect match
 708         return stream.line();
 709       } else {
 710         // update best_bci/line
 711         if (stream.bci() < bci && stream.bci() >= best_bci) {
 712           best_bci  = stream.bci();
 713           best_line = stream.line();
 714         }
 715       }
 716     }
 717   }
 718   return best_line;
 719 }
 720 
 721 
 722 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
 723   if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
 724     Thread *thread = Thread::current();
 725     Symbol* klass_name = constants()->klass_name_at(klass_index);
 726     Handle loader(thread, method_holder()->class_loader());
 727     Handle prot  (thread, method_holder()->protection_domain());
 728     return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
 729   } else {
 730     return true;
 731   }
 732 }
 733 
 734 
 735 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
 736   int klass_index = constants()->klass_ref_index_at(refinfo_index);
 737   if (must_be_resolved) {
 738     // Make sure klass is resolved in constantpool.
 739     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
 740   }
 741   return is_klass_loaded_by_klass_index(klass_index);
 742 }
 743 
 744 
 745 void Method::set_native_function(address function, bool post_event_flag) {
 746   assert(function != NULL, "use clear_native_function to unregister natives");
 747   assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
 748   address* native_function = native_function_addr();
 749 
 750   // We can see racers trying to place the same native function into place. Once
 751   // is plenty.
 752   address current = *native_function;
 753   if (current == function) return;
 754   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
 755       function != NULL) {
 756     // native_method_throw_unsatisfied_link_error_entry() should only
 757     // be passed when post_event_flag is false.
 758     assert(function !=
 759       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 760       "post_event_flag mis-match");
 761 
 762     // post the bind event, and possible change the bind function
 763     JvmtiExport::post_native_method_bind(this, &function);
 764   }
 765   *native_function = function;
 766   // This function can be called more than once. We must make sure that we always
 767   // use the latest registered method -> check if a stub already has been generated.
 768   // If so, we have to make it not_entrant.
 769   CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates
 770   if (nm != NULL) {
 771     nm->make_not_entrant();
 772   }
 773 }
 774 
 775 
 776 bool Method::has_native_function() const {
 777   if (is_method_handle_intrinsic())
 778     return false;  // special-cased in SharedRuntime::generate_native_wrapper
 779   address func = native_function();
 780   return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
 781 }
 782 
 783 
 784 void Method::clear_native_function() {
 785   // Note: is_method_handle_intrinsic() is allowed here.
 786   set_native_function(
 787     SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
 788     !native_bind_event_is_interesting);
 789   clear_code();
 790 }
 791 
 792 address Method::critical_native_function() {
 793   methodHandle mh(this);
 794   return NativeLookup::lookup_critical_entry(mh);
 795 }
 796 
 797 
 798 void Method::set_signature_handler(address handler) {
 799   address* signature_handler =  signature_handler_addr();
 800   *signature_handler = handler;
 801 }
 802 
 803 
 804 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
 805   if (PrintCompilation && report) {
 806     ttyLocker ttyl;
 807     tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
 808     if (comp_level == CompLevel_all) {
 809       tty->print("all levels ");
 810     } else {
 811       tty->print("levels ");
 812       for (int i = (int)CompLevel_none; i <= comp_level; i++) {
 813         tty->print("%d ", i);
 814       }
 815     }
 816     this->print_short_name(tty);
 817     int size = this->code_size();
 818     if (size > 0) {
 819       tty->print(" (%d bytes)", size);
 820     }
 821     if (reason != NULL) {
 822       tty->print("   %s", reason);
 823     }
 824     tty->cr();
 825   }
 826   if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
 827     ttyLocker ttyl;
 828     xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'",
 829                      os::current_thread_id(), is_osr, comp_level);
 830     if (reason != NULL) {
 831       xtty->print(" reason=\'%s\'", reason);
 832     }
 833     xtty->method(this);
 834     xtty->stamp();
 835     xtty->end_elem();
 836   }
 837 }
 838 
 839 bool Method::is_always_compilable() const {
 840   // Generated adapters must be compiled
 841   if (is_method_handle_intrinsic() && is_synthetic()) {
 842     assert(!is_not_c1_compilable(), "sanity check");
 843     assert(!is_not_c2_compilable(), "sanity check");
 844     return true;
 845   }
 846 
 847   return false;
 848 }
 849 
 850 bool Method::is_not_compilable(int comp_level) const {
 851   if (number_of_breakpoints() > 0)
 852     return true;
 853   if (is_always_compilable())
 854     return false;
 855   if (comp_level == CompLevel_any)
 856     return is_not_c1_compilable() || is_not_c2_compilable();
 857   if (is_c1_compile(comp_level))
 858     return is_not_c1_compilable();
 859   if (is_c2_compile(comp_level))
 860     return is_not_c2_compilable();
 861   return false;
 862 }
 863 
 864 // call this when compiler finds that this method is not compilable
 865 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
 866   if (is_always_compilable()) {
 867     // Don't mark a method which should be always compilable
 868     return;
 869   }
 870   print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
 871   if (comp_level == CompLevel_all) {
 872     set_not_c1_compilable();
 873     set_not_c2_compilable();
 874   } else {
 875     if (is_c1_compile(comp_level))
 876       set_not_c1_compilable();
 877     if (is_c2_compile(comp_level))
 878       set_not_c2_compilable();
 879   }
 880   CompilationPolicy::policy()->disable_compilation(this);
 881   assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
 882 }
 883 
 884 bool Method::is_not_osr_compilable(int comp_level) const {
 885   if (is_not_compilable(comp_level))
 886     return true;
 887   if (comp_level == CompLevel_any)
 888     return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
 889   if (is_c1_compile(comp_level))
 890     return is_not_c1_osr_compilable();
 891   if (is_c2_compile(comp_level))
 892     return is_not_c2_osr_compilable();
 893   return false;
 894 }
 895 
 896 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
 897   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
 898   if (comp_level == CompLevel_all) {
 899     set_not_c1_osr_compilable();
 900     set_not_c2_osr_compilable();
 901   } else {
 902     if (is_c1_compile(comp_level))
 903       set_not_c1_osr_compilable();
 904     if (is_c2_compile(comp_level))
 905       set_not_c2_osr_compilable();
 906   }
 907   CompilationPolicy::policy()->disable_compilation(this);
 908   assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
 909 }
 910 
 911 // Revert to using the interpreter and clear out the nmethod
 912 void Method::clear_code(bool acquire_lock /* = true */) {
 913   MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag);
 914   // this may be NULL if c2i adapters have not been made yet
 915   // Only should happen at allocate time.
 916   if (adapter() == NULL) {
 917     _from_compiled_entry    = NULL;
 918   } else {
 919     _from_compiled_entry    = adapter()->get_c2i_entry();
 920   }
 921   OrderAccess::storestore();
 922   _from_interpreted_entry = _i2i_entry;
 923   OrderAccess::storestore();
 924   _code = NULL;
 925 }
 926 
 927 #if INCLUDE_CDS
 928 // Called by class data sharing to remove any entry points (which are not shared)
 929 void Method::unlink_method() {
 930   _code = NULL;
 931 
 932   assert(DumpSharedSpaces, "dump time only");
 933   // Set the values to what they should be at run time. Note that
 934   // this Method can no longer be executed during dump time.
 935   _i2i_entry = Interpreter::entry_for_cds_method(this);
 936   _from_interpreted_entry = _i2i_entry;
 937 
 938   if (is_native()) {
 939     *native_function_addr() = NULL;
 940     set_signature_handler(NULL);
 941   }
 942   NOT_PRODUCT(set_compiled_invocation_count(0);)
 943 
 944   CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter();
 945   constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline());
 946   _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline();
 947   assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time");
 948 
 949   set_method_data(NULL);
 950   clear_method_counters();
 951 }
 952 #endif
 953 
 954 /****************************************************************************
 955 // The following illustrates how the entries work for CDS shared Methods:
 956 //
 957 // Our goal is to delay writing into a shared Method until it's compiled.
 958 // Hence, we want to determine the initial values for _i2i_entry,
 959 // _from_interpreted_entry and _from_compiled_entry during CDS dump time.
 960 //
 961 // In this example, both Methods A and B have the _i2i_entry of "zero_locals".
 962 // They also have similar signatures so that they will share the same
 963 // AdapterHandlerEntry.
 964 //
 965 // _adapter_trampoline points to a fixed location in the RW section of
 966 // the CDS archive. This location initially contains a NULL pointer. When the
 967 // first of method A or B is linked, an AdapterHandlerEntry is allocated
 968 // dynamically, and its c2i/i2c entries are generated.
 969 //
 970 // _i2i_entry and _from_interpreted_entry initially points to the same
 971 // (fixed) location in the CODE section of the CDS archive. This contains
 972 // an unconditional branch to the actual entry for "zero_locals", which is
 973 // generated at run time and may be on an arbitrary address. Thus, the
 974 // unconditional branch is also generated at run time to jump to the correct
 975 // address.
 976 //
 977 // Similarly, _from_compiled_entry points to a fixed address in the CODE
 978 // section. This address has enough space for an unconditional branch
 979 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is
 980 // initialized, and the address for the actual c2i_entry is known, we emit a
 981 // branch instruction here to branch to the actual c2i_entry.
 982 //
 983 // The effect of the extra branch on the i2i and c2i entries is negligible.
 984 //
 985 // The reason for putting _adapter_trampoline in RO is many shared Methods
 986 // share the same AdapterHandlerEntry, so we can save space in the RW section
 987 // by having the extra indirection.
 988 
 989 
 990 [Method A: RW]
 991   _constMethod ----> [ConstMethod: RO]
 992                        _adapter_trampoline -----------+
 993                                                       |
 994   _i2i_entry              (same value as method B)    |
 995   _from_interpreted_entry (same value as method B)    |
 996   _from_compiled_entry    (same value as method B)    |
 997                                                       |
 998                                                       |
 999 [Method B: RW]                               +--------+
1000   _constMethod ----> [ConstMethod: RO]       |
1001                        _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+
1002                                                                                  |
1003                                                  +-------------------------------+
1004                                                  |
1005                                                  +----> [AdapterHandlerEntry] (allocated at run time)
1006                                                               _fingerprint
1007                                                               _c2i_entry ---------------------------------+->[c2i entry..]
1008  _i2i_entry  -------------+                                   _i2c_entry ---------------+-> [i2c entry..] |
1009  _from_interpreted_entry  |                                   _c2i_unverified_entry     |                 |
1010          |                |                                                             |                 |
1011          |                |  (_cds_entry_table: CODE)                                   |                 |
1012          |                +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") |                 |
1013          |                |                               (allocated at run time)       |                 |
1014          |                |  ...                           [asm code ...]               |                 |
1015          +-[not compiled]-+  [n]: jmp _entry_table[n]                                   |                 |
1016          |                                                                              |                 |
1017          |                                                                              |                 |
1018          +-[compiled]-------------------------------------------------------------------+                 |
1019                                                                                                           |
1020  _from_compiled_entry------------>  (_c2i_entry_trampoline: CODE)                                         |
1021                                     [jmp c2i_entry] ------------------------------------------------------+
1022 
1023 ***/
1024 
1025 // Called when the method_holder is getting linked. Setup entrypoints so the method
1026 // is ready to be called from interpreter, compiler, and vtables.
1027 void Method::link_method(const methodHandle& h_method, TRAPS) {
1028   // If the code cache is full, we may reenter this function for the
1029   // leftover methods that weren't linked.
1030   if (is_shared()) {
1031     address entry = Interpreter::entry_for_cds_method(h_method);
1032     assert(entry != NULL && entry == _i2i_entry,
1033            "should be correctly set during dump time");
1034     if (adapter() != NULL) {
1035       return;
1036     }
1037     assert(entry == _from_interpreted_entry,
1038            "should be correctly set during dump time");
1039   } else if (_i2i_entry != NULL) {
1040     return;
1041   }
1042   assert( _code == NULL, "nothing compiled yet" );
1043 
1044   // Setup interpreter entrypoint
1045   assert(this == h_method(), "wrong h_method()" );
1046 
1047   if (!is_shared()) {
1048     assert(adapter() == NULL, "init'd to NULL");
1049     address entry = Interpreter::entry_for_method(h_method);
1050     assert(entry != NULL, "interpreter entry must be non-null");
1051     // Sets both _i2i_entry and _from_interpreted_entry
1052     set_interpreter_entry(entry);
1053   }
1054 
1055   // Don't overwrite already registered native entries.
1056   if (is_native() && !has_native_function()) {
1057     set_native_function(
1058       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1059       !native_bind_event_is_interesting);
1060   }
1061 
1062   // Setup compiler entrypoint.  This is made eagerly, so we do not need
1063   // special handling of vtables.  An alternative is to make adapters more
1064   // lazily by calling make_adapter() from from_compiled_entry() for the
1065   // normal calls.  For vtable calls life gets more complicated.  When a
1066   // call-site goes mega-morphic we need adapters in all methods which can be
1067   // called from the vtable.  We need adapters on such methods that get loaded
1068   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
1069   // problem we'll make these lazily later.
1070   (void) make_adapters(h_method, CHECK);
1071 
1072   // ONLY USE the h_method now as make_adapter may have blocked
1073 
1074 }
1075 
1076 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1077   // Adapters for compiled code are made eagerly here.  They are fairly
1078   // small (generally < 100 bytes) and quick to make (and cached and shared)
1079   // so making them eagerly shouldn't be too expensive.
1080   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1081   if (adapter == NULL ) {
1082     if (!is_init_completed()) {
1083       // Don't throw exceptions during VM initialization because java.lang.* classes
1084       // might not have been initialized, causing problems when constructing the
1085       // Java exception object.
1086       vm_exit_during_initialization("Out of space in CodeCache for adapters");
1087     } else {
1088       THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1089     }
1090   }
1091 
1092   if (mh->is_shared()) {
1093     assert(mh->adapter() == adapter, "must be");
1094     assert(mh->_from_compiled_entry != NULL, "must be");
1095   } else {
1096     mh->set_adapter_entry(adapter);
1097     mh->_from_compiled_entry = adapter->get_c2i_entry();
1098   }
1099   return adapter->get_c2i_entry();
1100 }
1101 
1102 void Method::restore_unshareable_info(TRAPS) {
1103   assert(is_method() && is_valid_method(), "ensure C++ vtable is restored");
1104 
1105   // Since restore_unshareable_info can be called more than once for a method, don't
1106   // redo any work.
1107   if (adapter() == NULL) {
1108     methodHandle mh(THREAD, this);
1109     link_method(mh, CHECK);
1110   }
1111 }
1112 
1113 volatile address Method::from_compiled_entry_no_trampoline() const {
1114   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
1115   if (code) {
1116     return code->verified_entry_point();
1117   } else {
1118     return adapter()->get_c2i_entry();
1119   }
1120 }
1121 
1122 // The verified_code_entry() must be called when a invoke is resolved
1123 // on this method.
1124 
1125 // It returns the compiled code entry point, after asserting not null.
1126 // This function is called after potential safepoints so that nmethod
1127 // or adapter that it points to is still live and valid.
1128 // This function must not hit a safepoint!
1129 address Method::verified_code_entry() {
1130   debug_only(NoSafepointVerifier nsv;)
1131   assert(_from_compiled_entry != NULL, "must be set");
1132   return _from_compiled_entry;
1133 }
1134 
1135 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1136 // (could be racing a deopt).
1137 // Not inline to avoid circular ref.
1138 bool Method::check_code() const {
1139   // cached in a register or local.  There's a race on the value of the field.
1140   CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
1141   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1142 }
1143 
1144 // Install compiled code.  Instantly it can execute.
1145 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1146   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1147   assert( code, "use clear_code to remove code" );
1148   assert( mh->check_code(), "" );
1149 
1150   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1151 
1152   // These writes must happen in this order, because the interpreter will
1153   // directly jump to from_interpreted_entry which jumps to an i2c adapter
1154   // which jumps to _from_compiled_entry.
1155   mh->_code = code;             // Assign before allowing compiled code to exec
1156 
1157   int comp_level = code->comp_level();
1158   // In theory there could be a race here. In practice it is unlikely
1159   // and not worth worrying about.
1160   if (comp_level > mh->highest_comp_level()) {
1161     mh->set_highest_comp_level(comp_level);
1162   }
1163 
1164   OrderAccess::storestore();
1165 #ifdef SHARK
1166   mh->_from_interpreted_entry = code->insts_begin();
1167 #else //!SHARK
1168   mh->_from_compiled_entry = code->verified_entry_point();
1169   OrderAccess::storestore();
1170   // Instantly compiled code can execute.
1171   if (!mh->is_method_handle_intrinsic())
1172     mh->_from_interpreted_entry = mh->get_i2c_entry();
1173 #endif //!SHARK
1174 }
1175 
1176 
1177 bool Method::is_overridden_in(Klass* k) const {
1178   InstanceKlass* ik = InstanceKlass::cast(k);
1179 
1180   if (ik->is_interface()) return false;
1181 
1182   // If method is an interface, we skip it - except if it
1183   // is a miranda method
1184   if (method_holder()->is_interface()) {
1185     // Check that method is not a miranda method
1186     if (ik->lookup_method(name(), signature()) == NULL) {
1187       // No implementation exist - so miranda method
1188       return false;
1189     }
1190     return true;
1191   }
1192 
1193   assert(ik->is_subclass_of(method_holder()), "should be subklass");
1194   if (!has_vtable_index()) {
1195     return false;
1196   } else {
1197     Method* vt_m = ik->method_at_vtable(vtable_index());
1198     return vt_m != this;
1199   }
1200 }
1201 
1202 
1203 // give advice about whether this Method* should be cached or not
1204 bool Method::should_not_be_cached() const {
1205   if (is_old()) {
1206     // This method has been redefined. It is either EMCP or obsolete
1207     // and we don't want to cache it because that would pin the method
1208     // down and prevent it from being collectible if and when it
1209     // finishes executing.
1210     return true;
1211   }
1212 
1213   // caching this method should be just fine
1214   return false;
1215 }
1216 
1217 
1218 /**
1219  *  Returns true if this is one of the specially treated methods for
1220  *  security related stack walks (like Reflection.getCallerClass).
1221  */
1222 bool Method::is_ignored_by_security_stack_walk() const {
1223   if (intrinsic_id() == vmIntrinsics::_invoke) {
1224     // This is Method.invoke() -- ignore it
1225     return true;
1226   }
1227   if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
1228     // This is an auxilary frame -- ignore it
1229     return true;
1230   }
1231   if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
1232     // This is an internal adapter frame for method handles -- ignore it
1233     return true;
1234   }
1235   return false;
1236 }
1237 
1238 
1239 // Constant pool structure for invoke methods:
1240 enum {
1241   _imcp_invoke_name = 1,        // utf8: 'invokeExact', etc.
1242   _imcp_invoke_signature,       // utf8: (variable Symbol*)
1243   _imcp_limit
1244 };
1245 
1246 // Test if this method is an MH adapter frame generated by Java code.
1247 // Cf. java/lang/invoke/InvokerBytecodeGenerator
1248 bool Method::is_compiled_lambda_form() const {
1249   return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
1250 }
1251 
1252 // Test if this method is an internal MH primitive method.
1253 bool Method::is_method_handle_intrinsic() const {
1254   vmIntrinsics::ID iid = intrinsic_id();
1255   return (MethodHandles::is_signature_polymorphic(iid) &&
1256           MethodHandles::is_signature_polymorphic_intrinsic(iid));
1257 }
1258 
1259 bool Method::has_member_arg() const {
1260   vmIntrinsics::ID iid = intrinsic_id();
1261   return (MethodHandles::is_signature_polymorphic(iid) &&
1262           MethodHandles::has_member_arg(iid));
1263 }
1264 
1265 // Make an instance of a signature-polymorphic internal MH primitive.
1266 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
1267                                                          Symbol* signature,
1268                                                          TRAPS) {
1269   ResourceMark rm;
1270   methodHandle empty;
1271 
1272   InstanceKlass* holder = SystemDictionary::MethodHandle_klass();
1273   Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
1274   assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
1275   if (TraceMethodHandles) {
1276     tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
1277   }
1278 
1279   // invariant:   cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
1280   name->increment_refcount();
1281   signature->increment_refcount();
1282 
1283   int cp_length = _imcp_limit;
1284   ClassLoaderData* loader_data = holder->class_loader_data();
1285   constantPoolHandle cp;
1286   {
1287     ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
1288     cp = constantPoolHandle(THREAD, cp_oop);
1289   }
1290   cp->set_pool_holder(holder);
1291   cp->symbol_at_put(_imcp_invoke_name,       name);
1292   cp->symbol_at_put(_imcp_invoke_signature,  signature);
1293   cp->set_has_preresolution();
1294 
1295   // decide on access bits:  public or not?
1296   int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
1297   bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
1298   if (must_be_static)  flags_bits |= JVM_ACC_STATIC;
1299   assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
1300 
1301   methodHandle m;
1302   {
1303     InlineTableSizes sizes;
1304     Method* m_oop = Method::allocate(loader_data, 0,
1305                                      accessFlags_from(flags_bits), &sizes,
1306                                      ConstMethod::NORMAL, CHECK_(empty));
1307     m = methodHandle(THREAD, m_oop);
1308   }
1309   m->set_constants(cp());
1310   m->set_name_index(_imcp_invoke_name);
1311   m->set_signature_index(_imcp_invoke_signature);
1312   assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
1313   assert(m->signature() == signature, "");
1314   ResultTypeFinder rtf(signature);
1315   m->constMethod()->set_result_type(rtf.type());
1316   m->compute_size_of_parameters(THREAD);
1317   m->init_intrinsic_id();
1318   assert(m->is_method_handle_intrinsic(), "");
1319 #ifdef ASSERT
1320   if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id()))  m->print();
1321   assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
1322   assert(m->intrinsic_id() == iid, "correctly predicted iid");
1323 #endif //ASSERT
1324 
1325   // Finally, set up its entry points.
1326   assert(m->can_be_statically_bound(), "");
1327   m->set_vtable_index(Method::nonvirtual_vtable_index);
1328   m->link_method(m, CHECK_(empty));
1329 
1330   if (TraceMethodHandles && (Verbose || WizardMode)) {
1331     ttyLocker ttyl;
1332     m->print_on(tty);
1333   }
1334 
1335   return m;
1336 }
1337 
1338 Klass* Method::check_non_bcp_klass(Klass* klass) {
1339   if (klass != NULL && klass->class_loader() != NULL) {
1340     if (klass->is_objArray_klass())
1341       klass = ObjArrayKlass::cast(klass)->bottom_klass();
1342     return klass;
1343   }
1344   return NULL;
1345 }
1346 
1347 
1348 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
1349                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
1350   // Code below does not work for native methods - they should never get rewritten anyway
1351   assert(!m->is_native(), "cannot rewrite native methods");
1352   // Allocate new Method*
1353   AccessFlags flags = m->access_flags();
1354 
1355   ConstMethod* cm = m->constMethod();
1356   int checked_exceptions_len = cm->checked_exceptions_length();
1357   int localvariable_len = cm->localvariable_table_length();
1358   int exception_table_len = cm->exception_table_length();
1359   int method_parameters_len = cm->method_parameters_length();
1360   int method_annotations_len = cm->method_annotations_length();
1361   int parameter_annotations_len = cm->parameter_annotations_length();
1362   int type_annotations_len = cm->type_annotations_length();
1363   int default_annotations_len = cm->default_annotations_length();
1364 
1365   InlineTableSizes sizes(
1366       localvariable_len,
1367       new_compressed_linenumber_size,
1368       exception_table_len,
1369       checked_exceptions_len,
1370       method_parameters_len,
1371       cm->generic_signature_index(),
1372       method_annotations_len,
1373       parameter_annotations_len,
1374       type_annotations_len,
1375       default_annotations_len,
1376       0);
1377 
1378   ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
1379   Method* newm_oop = Method::allocate(loader_data,
1380                                       new_code_length,
1381                                       flags,
1382                                       &sizes,
1383                                       m->method_type(),
1384                                       CHECK_(methodHandle()));
1385   methodHandle newm (THREAD, newm_oop);
1386 
1387   // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
1388   ConstMethod* newcm = newm->constMethod();
1389   int new_const_method_size = newm->constMethod()->size();
1390 
1391   // This works because the source and target are both Methods. Some compilers
1392   // (e.g., clang) complain that the target vtable pointer will be stomped,
1393   // so cast away newm()'s and m()'s Methodness.
1394   memcpy((void*)newm(), (void*)m(), sizeof(Method));
1395 
1396   // Create shallow copy of ConstMethod.
1397   memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
1398 
1399   // Reset correct method/const method, method size, and parameter info
1400   newm->set_constMethod(newcm);
1401   newm->constMethod()->set_code_size(new_code_length);
1402   newm->constMethod()->set_constMethod_size(new_const_method_size);
1403   assert(newm->code_size() == new_code_length, "check");
1404   assert(newm->method_parameters_length() == method_parameters_len, "check");
1405   assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
1406   assert(newm->exception_table_length() == exception_table_len, "check");
1407   assert(newm->localvariable_table_length() == localvariable_len, "check");
1408   // Copy new byte codes
1409   memcpy(newm->code_base(), new_code, new_code_length);
1410   // Copy line number table
1411   if (new_compressed_linenumber_size > 0) {
1412     memcpy(newm->compressed_linenumber_table(),
1413            new_compressed_linenumber_table,
1414            new_compressed_linenumber_size);
1415   }
1416   // Copy method_parameters
1417   if (method_parameters_len > 0) {
1418     memcpy(newm->method_parameters_start(),
1419            m->method_parameters_start(),
1420            method_parameters_len * sizeof(MethodParametersElement));
1421   }
1422   // Copy checked_exceptions
1423   if (checked_exceptions_len > 0) {
1424     memcpy(newm->checked_exceptions_start(),
1425            m->checked_exceptions_start(),
1426            checked_exceptions_len * sizeof(CheckedExceptionElement));
1427   }
1428   // Copy exception table
1429   if (exception_table_len > 0) {
1430     memcpy(newm->exception_table_start(),
1431            m->exception_table_start(),
1432            exception_table_len * sizeof(ExceptionTableElement));
1433   }
1434   // Copy local variable number table
1435   if (localvariable_len > 0) {
1436     memcpy(newm->localvariable_table_start(),
1437            m->localvariable_table_start(),
1438            localvariable_len * sizeof(LocalVariableTableElement));
1439   }
1440   // Copy stackmap table
1441   if (m->has_stackmap_table()) {
1442     int code_attribute_length = m->stackmap_data()->length();
1443     Array<u1>* stackmap_data =
1444       MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
1445     memcpy((void*)stackmap_data->adr_at(0),
1446            (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
1447     newm->set_stackmap_data(stackmap_data);
1448   }
1449 
1450   // copy annotations over to new method
1451   newcm->copy_annotations_from(loader_data, cm, CHECK_NULL);
1452   return newm;
1453 }
1454 
1455 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) {
1456   // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
1457   // because we are not loading from core libraries
1458   // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
1459   // which does not use the class default class loader so we check for its loader here
1460   const InstanceKlass* ik = InstanceKlass::cast(holder);
1461   if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) {
1462     return vmSymbols::NO_SID;   // regardless of name, no intrinsics here
1463   }
1464 
1465   // see if the klass name is well-known:
1466   Symbol* klass_name = ik->name();
1467   return vmSymbols::find_sid(klass_name);
1468 }
1469 
1470 void Method::init_intrinsic_id() {
1471   assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
1472   const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
1473   assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
1474   assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
1475 
1476   // the klass name is well-known:
1477   vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
1478   assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
1479 
1480   // ditto for method and signature:
1481   vmSymbols::SID  name_id = vmSymbols::find_sid(name());
1482   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1483       && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1484       && name_id == vmSymbols::NO_SID) {
1485     return;
1486   }
1487   vmSymbols::SID   sig_id = vmSymbols::find_sid(signature());
1488   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
1489       && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle)
1490       && sig_id == vmSymbols::NO_SID) {
1491     return;
1492   }
1493   jshort flags = access_flags().as_short();
1494 
1495   vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1496   if (id != vmIntrinsics::_none) {
1497     set_intrinsic_id(id);
1498     if (id == vmIntrinsics::_Class_cast) {
1499       // Even if the intrinsic is rejected, we want to inline this simple method.
1500       set_force_inline(true);
1501     }
1502     return;
1503   }
1504 
1505   // A few slightly irregular cases:
1506   switch (klass_id) {
1507   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
1508     // Second chance: check in regular Math.
1509     switch (name_id) {
1510     case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
1511     case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
1512     case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
1513       // pretend it is the corresponding method in the non-strict class:
1514       klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
1515       id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
1516       break;
1517     default:
1518       break;
1519     }
1520     break;
1521 
1522   // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle
1523   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
1524   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle):
1525     if (!is_native())  break;
1526     id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
1527     if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
1528       id = vmIntrinsics::_none;
1529     break;
1530 
1531   default:
1532     break;
1533   }
1534 
1535   if (id != vmIntrinsics::_none) {
1536     // Set up its iid.  It is an alias method.
1537     set_intrinsic_id(id);
1538     return;
1539   }
1540 }
1541 
1542 // These two methods are static since a GC may move the Method
1543 bool Method::load_signature_classes(const methodHandle& m, TRAPS) {
1544   if (!THREAD->can_call_java()) {
1545     // There is nothing useful this routine can do from within the Compile thread.
1546     // Hopefully, the signature contains only well-known classes.
1547     // We could scan for this and return true/false, but the caller won't care.
1548     return false;
1549   }
1550   bool sig_is_loaded = true;
1551   Handle class_loader(THREAD, m->method_holder()->class_loader());
1552   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1553   ResourceMark rm(THREAD);
1554   Symbol*  signature = m->signature();
1555   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1556     if (ss.is_object()) {
1557       Symbol* sym = ss.as_symbol(CHECK_(false));
1558       Symbol*  name  = sym;
1559       Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
1560                                              protection_domain, THREAD);
1561       // We are loading classes eagerly. If a ClassNotFoundException or
1562       // a LinkageError was generated, be sure to ignore it.
1563       if (HAS_PENDING_EXCEPTION) {
1564         if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
1565             PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
1566           CLEAR_PENDING_EXCEPTION;
1567         } else {
1568           return false;
1569         }
1570       }
1571       if( klass == NULL) { sig_is_loaded = false; }
1572     }
1573   }
1574   return sig_is_loaded;
1575 }
1576 
1577 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) {
1578   Handle class_loader(THREAD, m->method_holder()->class_loader());
1579   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
1580   ResourceMark rm(THREAD);
1581   Symbol*  signature = m->signature();
1582   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
1583     if (ss.type() == T_OBJECT) {
1584       Symbol* name = ss.as_symbol_or_null();
1585       if (name == NULL) return true;
1586       Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
1587       if (klass == NULL) return true;
1588     }
1589   }
1590   return false;
1591 }
1592 
1593 // Exposed so field engineers can debug VM
1594 void Method::print_short_name(outputStream* st) {
1595   ResourceMark rm;
1596 #ifdef PRODUCT
1597   st->print(" %s::", method_holder()->external_name());
1598 #else
1599   st->print(" %s::", method_holder()->internal_name());
1600 #endif
1601   name()->print_symbol_on(st);
1602   if (WizardMode) signature()->print_symbol_on(st);
1603   else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
1604     MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
1605 }
1606 
1607 // Comparer for sorting an object array containing
1608 // Method*s.
1609 static int method_comparator(Method* a, Method* b) {
1610   return a->name()->fast_compare(b->name());
1611 }
1612 
1613 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
1614 // default_methods also uses this without the ordering for fast find_method
1615 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
1616   int length = methods->length();
1617   if (length > 1) {
1618     {
1619       NoSafepointVerifier nsv;
1620       QuickSort::sort(methods->data(), length, method_comparator, idempotent);
1621     }
1622     // Reset method ordering
1623     if (set_idnums) {
1624       for (int i = 0; i < length; i++) {
1625         Method* m = methods->at(i);
1626         m->set_method_idnum(i);
1627         m->set_orig_method_idnum(i);
1628       }
1629     }
1630   }
1631 }
1632 
1633 //-----------------------------------------------------------------------------------
1634 // Non-product code unless JVM/TI needs it
1635 
1636 #if !defined(PRODUCT) || INCLUDE_JVMTI
1637 class SignatureTypePrinter : public SignatureTypeNames {
1638  private:
1639   outputStream* _st;
1640   bool _use_separator;
1641 
1642   void type_name(const char* name) {
1643     if (_use_separator) _st->print(", ");
1644     _st->print("%s", name);
1645     _use_separator = true;
1646   }
1647 
1648  public:
1649   SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
1650     _st = st;
1651     _use_separator = false;
1652   }
1653 
1654   void print_parameters()              { _use_separator = false; iterate_parameters(); }
1655   void print_returntype()              { _use_separator = false; iterate_returntype(); }
1656 };
1657 
1658 
1659 void Method::print_name(outputStream* st) {
1660   Thread *thread = Thread::current();
1661   ResourceMark rm(thread);
1662   st->print("%s ", is_static() ? "static" : "virtual");
1663   if (WizardMode) {
1664     st->print("%s.", method_holder()->internal_name());
1665     name()->print_symbol_on(st);
1666     signature()->print_symbol_on(st);
1667   } else {
1668     SignatureTypePrinter sig(signature(), st);
1669     sig.print_returntype();
1670     st->print(" %s.", method_holder()->internal_name());
1671     name()->print_symbol_on(st);
1672     st->print("(");
1673     sig.print_parameters();
1674     st->print(")");
1675   }
1676 }
1677 #endif // !PRODUCT || INCLUDE_JVMTI
1678 
1679 
1680 void Method::print_codes_on(outputStream* st) const {
1681   print_codes_on(0, code_size(), st);
1682 }
1683 
1684 void Method::print_codes_on(int from, int to, outputStream* st) const {
1685   Thread *thread = Thread::current();
1686   ResourceMark rm(thread);
1687   methodHandle mh (thread, (Method*)this);
1688   BytecodeStream s(mh);
1689   s.set_interval(from, to);
1690   BytecodeTracer::set_closure(BytecodeTracer::std_closure());
1691   while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
1692 }
1693 
1694 
1695 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
1696 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1697 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
1698 // as end-of-stream terminator.
1699 
1700 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
1701   // bci and line number does not compress into single byte.
1702   // Write out escape character and use regular compression for bci and line number.
1703   write_byte((jubyte)0xFF);
1704   write_signed_int(bci_delta);
1705   write_signed_int(line_delta);
1706 }
1707 
1708 // See comment in method.hpp which explains why this exists.
1709 #if defined(_M_AMD64) && _MSC_VER >= 1400
1710 #pragma optimize("", off)
1711 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
1712   write_pair_inline(bci, line);
1713 }
1714 #pragma optimize("", on)
1715 #endif
1716 
1717 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
1718   _bci = 0;
1719   _line = 0;
1720 };
1721 
1722 
1723 bool CompressedLineNumberReadStream::read_pair() {
1724   jubyte next = read_byte();
1725   // Check for terminator
1726   if (next == 0) return false;
1727   if (next == 0xFF) {
1728     // Escape character, regular compression used
1729     _bci  += read_signed_int();
1730     _line += read_signed_int();
1731   } else {
1732     // Single byte compression used
1733     _bci  += next >> 3;
1734     _line += next & 0x7;
1735   }
1736   return true;
1737 }
1738 
1739 #if INCLUDE_JVMTI
1740 
1741 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
1742   BreakpointInfo* bp = method_holder()->breakpoints();
1743   for (; bp != NULL; bp = bp->next()) {
1744     if (bp->match(this, bci)) {
1745       return bp->orig_bytecode();
1746     }
1747   }
1748   {
1749     ResourceMark rm;
1750     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
1751   }
1752   return Bytecodes::_shouldnotreachhere;
1753 }
1754 
1755 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
1756   assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
1757   BreakpointInfo* bp = method_holder()->breakpoints();
1758   for (; bp != NULL; bp = bp->next()) {
1759     if (bp->match(this, bci)) {
1760       bp->set_orig_bytecode(code);
1761       // and continue, in case there is more than one
1762     }
1763   }
1764 }
1765 
1766 void Method::set_breakpoint(int bci) {
1767   InstanceKlass* ik = method_holder();
1768   BreakpointInfo *bp = new BreakpointInfo(this, bci);
1769   bp->set_next(ik->breakpoints());
1770   ik->set_breakpoints(bp);
1771   // do this last:
1772   bp->set(this);
1773 }
1774 
1775 static void clear_matches(Method* m, int bci) {
1776   InstanceKlass* ik = m->method_holder();
1777   BreakpointInfo* prev_bp = NULL;
1778   BreakpointInfo* next_bp;
1779   for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
1780     next_bp = bp->next();
1781     // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
1782     if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
1783       // do this first:
1784       bp->clear(m);
1785       // unhook it
1786       if (prev_bp != NULL)
1787         prev_bp->set_next(next_bp);
1788       else
1789         ik->set_breakpoints(next_bp);
1790       delete bp;
1791       // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
1792       // at same location. So we have multiple matching (method_index and bci)
1793       // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
1794       // breakpoint for clear_breakpoint request and keep all other method versions
1795       // BreakpointInfo for future clear_breakpoint request.
1796       // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
1797       // which is being called when class is unloaded. We delete all the Breakpoint
1798       // information for all versions of method. We may not correctly restore the original
1799       // bytecode in all method versions, but that is ok. Because the class is being unloaded
1800       // so these methods won't be used anymore.
1801       if (bci >= 0) {
1802         break;
1803       }
1804     } else {
1805       // This one is a keeper.
1806       prev_bp = bp;
1807     }
1808   }
1809 }
1810 
1811 void Method::clear_breakpoint(int bci) {
1812   assert(bci >= 0, "");
1813   clear_matches(this, bci);
1814 }
1815 
1816 void Method::clear_all_breakpoints() {
1817   clear_matches(this, -1);
1818 }
1819 
1820 #endif // INCLUDE_JVMTI
1821 
1822 int Method::invocation_count() {
1823   MethodCounters *mcs = method_counters();
1824   if (TieredCompilation) {
1825     MethodData* const mdo = method_data();
1826     if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
1827         ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
1828       return InvocationCounter::count_limit;
1829     } else {
1830       return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
1831              ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
1832     }
1833   } else {
1834     return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
1835   }
1836 }
1837 
1838 int Method::backedge_count() {
1839   MethodCounters *mcs = method_counters();
1840   if (TieredCompilation) {
1841     MethodData* const mdo = method_data();
1842     if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
1843         ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
1844       return InvocationCounter::count_limit;
1845     } else {
1846       return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
1847              ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
1848     }
1849   } else {
1850     return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
1851   }
1852 }
1853 
1854 int Method::highest_comp_level() const {
1855   const MethodCounters* mcs = method_counters();
1856   if (mcs != NULL) {
1857     return mcs->highest_comp_level();
1858   } else {
1859     return CompLevel_none;
1860   }
1861 }
1862 
1863 int Method::highest_osr_comp_level() const {
1864   const MethodCounters* mcs = method_counters();
1865   if (mcs != NULL) {
1866     return mcs->highest_osr_comp_level();
1867   } else {
1868     return CompLevel_none;
1869   }
1870 }
1871 
1872 void Method::set_highest_comp_level(int level) {
1873   MethodCounters* mcs = method_counters();
1874   if (mcs != NULL) {
1875     mcs->set_highest_comp_level(level);
1876   }
1877 }
1878 
1879 void Method::set_highest_osr_comp_level(int level) {
1880   MethodCounters* mcs = method_counters();
1881   if (mcs != NULL) {
1882     mcs->set_highest_osr_comp_level(level);
1883   }
1884 }
1885 
1886 #if INCLUDE_JVMTI
1887 
1888 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
1889   _bci = bci;
1890   _name_index = m->name_index();
1891   _signature_index = m->signature_index();
1892   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
1893   if (_orig_bytecode == Bytecodes::_breakpoint)
1894     _orig_bytecode = m->orig_bytecode_at(_bci);
1895   _next = NULL;
1896 }
1897 
1898 void BreakpointInfo::set(Method* method) {
1899 #ifdef ASSERT
1900   {
1901     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
1902     if (code == Bytecodes::_breakpoint)
1903       code = method->orig_bytecode_at(_bci);
1904     assert(orig_bytecode() == code, "original bytecode must be the same");
1905   }
1906 #endif
1907   Thread *thread = Thread::current();
1908   *method->bcp_from(_bci) = Bytecodes::_breakpoint;
1909   method->incr_number_of_breakpoints(thread);
1910   SystemDictionary::notice_modification();
1911   {
1912     // Deoptimize all dependents on this method
1913     HandleMark hm(thread);
1914     methodHandle mh(thread, method);
1915     CodeCache::flush_dependents_on_method(mh);
1916   }
1917 }
1918 
1919 void BreakpointInfo::clear(Method* method) {
1920   *method->bcp_from(_bci) = orig_bytecode();
1921   assert(method->number_of_breakpoints() > 0, "must not go negative");
1922   method->decr_number_of_breakpoints(Thread::current());
1923 }
1924 
1925 #endif // INCLUDE_JVMTI
1926 
1927 // jmethodID handling
1928 
1929 // This is a block allocating object, sort of like JNIHandleBlock, only a
1930 // lot simpler.
1931 // It's allocated on the CHeap because once we allocate a jmethodID, we can
1932 // never get rid of it.
1933 
1934 static const int min_block_size = 8;
1935 
1936 class JNIMethodBlockNode : public CHeapObj<mtClass> {
1937   friend class JNIMethodBlock;
1938   Method**        _methods;
1939   int             _number_of_methods;
1940   int             _top;
1941   JNIMethodBlockNode* _next;
1942 
1943  public:
1944 
1945   JNIMethodBlockNode(int num_methods = min_block_size);
1946 
1947   ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); }
1948 
1949   void ensure_methods(int num_addl_methods) {
1950     if (_top < _number_of_methods) {
1951       num_addl_methods -= _number_of_methods - _top;
1952       if (num_addl_methods <= 0) {
1953         return;
1954       }
1955     }
1956     if (_next == NULL) {
1957       _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size));
1958     } else {
1959       _next->ensure_methods(num_addl_methods);
1960     }
1961   }
1962 };
1963 
1964 class JNIMethodBlock : public CHeapObj<mtClass> {
1965   JNIMethodBlockNode _head;
1966   JNIMethodBlockNode *_last_free;
1967  public:
1968   static Method* const _free_method;
1969 
1970   JNIMethodBlock(int initial_capacity = min_block_size)
1971       : _head(initial_capacity), _last_free(&_head) {}
1972 
1973   void ensure_methods(int num_addl_methods) {
1974     _last_free->ensure_methods(num_addl_methods);
1975   }
1976 
1977   Method** add_method(Method* m) {
1978     for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) {
1979       if (b->_top < b->_number_of_methods) {
1980         // top points to the next free entry.
1981         int i = b->_top;
1982         b->_methods[i] = m;
1983         b->_top++;
1984         _last_free = b;
1985         return &(b->_methods[i]);
1986       } else if (b->_top == b->_number_of_methods) {
1987         // if the next free entry ran off the block see if there's a free entry
1988         for (int i = 0; i < b->_number_of_methods; i++) {
1989           if (b->_methods[i] == _free_method) {
1990             b->_methods[i] = m;
1991             _last_free = b;
1992             return &(b->_methods[i]);
1993           }
1994         }
1995         // Only check each block once for frees.  They're very unlikely.
1996         // Increment top past the end of the block.
1997         b->_top++;
1998       }
1999       // need to allocate a next block.
2000       if (b->_next == NULL) {
2001         b->_next = _last_free = new JNIMethodBlockNode();
2002       }
2003     }
2004     guarantee(false, "Should always allocate a free block");
2005     return NULL;
2006   }
2007 
2008   bool contains(Method** m) {
2009     if (m == NULL) return false;
2010     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2011       if (b->_methods <= m && m < b->_methods + b->_number_of_methods) {
2012         // This is a bit of extra checking, for two reasons.  One is
2013         // that contains() deals with pointers that are passed in by
2014         // JNI code, so making sure that the pointer is aligned
2015         // correctly is valuable.  The other is that <= and > are
2016         // technically not defined on pointers, so the if guard can
2017         // pass spuriously; no modern compiler is likely to make that
2018         // a problem, though (and if one did, the guard could also
2019         // fail spuriously, which would be bad).
2020         ptrdiff_t idx = m - b->_methods;
2021         if (b->_methods + idx == m) {
2022           return true;
2023         }
2024       }
2025     }
2026     return false;  // not found
2027   }
2028 
2029   // Doesn't really destroy it, just marks it as free so it can be reused.
2030   void destroy_method(Method** m) {
2031 #ifdef ASSERT
2032     assert(contains(m), "should be a methodID");
2033 #endif // ASSERT
2034     *m = _free_method;
2035   }
2036 
2037   // During class unloading the methods are cleared, which is different
2038   // than freed.
2039   void clear_all_methods() {
2040     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2041       for (int i = 0; i< b->_number_of_methods; i++) {
2042         b->_methods[i] = NULL;
2043       }
2044     }
2045   }
2046 #ifndef PRODUCT
2047   int count_methods() {
2048     // count all allocated methods
2049     int count = 0;
2050     for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) {
2051       for (int i = 0; i< b->_number_of_methods; i++) {
2052         if (b->_methods[i] != _free_method) count++;
2053       }
2054     }
2055     return count;
2056   }
2057 #endif // PRODUCT
2058 };
2059 
2060 // Something that can't be mistaken for an address or a markOop
2061 Method* const JNIMethodBlock::_free_method = (Method*)55;
2062 
2063 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) {
2064   _number_of_methods = MAX2(num_methods, min_block_size);
2065   _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal);
2066   for (int i = 0; i < _number_of_methods; i++) {
2067     _methods[i] = JNIMethodBlock::_free_method;
2068   }
2069 }
2070 
2071 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
2072   ClassLoaderData* cld = loader_data;
2073   if (!SafepointSynchronize::is_at_safepoint()) {
2074     // Have to add jmethod_ids() to class loader data thread-safely.
2075     // Also have to add the method to the list safely, which the cld lock
2076     // protects as well.
2077     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2078     if (cld->jmethod_ids() == NULL) {
2079       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2080     } else {
2081       cld->jmethod_ids()->ensure_methods(capacity);
2082     }
2083   } else {
2084     // At safepoint, we are single threaded and can set this.
2085     if (cld->jmethod_ids() == NULL) {
2086       cld->set_jmethod_ids(new JNIMethodBlock(capacity));
2087     } else {
2088       cld->jmethod_ids()->ensure_methods(capacity);
2089     }
2090   }
2091 }
2092 
2093 // Add a method id to the jmethod_ids
2094 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
2095   ClassLoaderData* cld = loader_data;
2096 
2097   if (!SafepointSynchronize::is_at_safepoint()) {
2098     // Have to add jmethod_ids() to class loader data thread-safely.
2099     // Also have to add the method to the list safely, which the cld lock
2100     // protects as well.
2101     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
2102     if (cld->jmethod_ids() == NULL) {
2103       cld->set_jmethod_ids(new JNIMethodBlock());
2104     }
2105     // jmethodID is a pointer to Method*
2106     return (jmethodID)cld->jmethod_ids()->add_method(m);
2107   } else {
2108     // At safepoint, we are single threaded and can set this.
2109     if (cld->jmethod_ids() == NULL) {
2110       cld->set_jmethod_ids(new JNIMethodBlock());
2111     }
2112     // jmethodID is a pointer to Method*
2113     return (jmethodID)cld->jmethod_ids()->add_method(m);
2114   }
2115 }
2116 
2117 // Mark a jmethodID as free.  This is called when there is a data race in
2118 // InstanceKlass while creating the jmethodID cache.
2119 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
2120   ClassLoaderData* cld = loader_data;
2121   Method** ptr = (Method**)m;
2122   assert(cld->jmethod_ids() != NULL, "should have method handles");
2123   cld->jmethod_ids()->destroy_method(ptr);
2124 }
2125 
2126 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
2127   // Can't assert the method_holder is the same because the new method has the
2128   // scratch method holder.
2129   assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
2130            == new_method->method_holder()->class_loader(),
2131          "changing to a different class loader");
2132   // Just change the method in place, jmethodID pointer doesn't change.
2133   *((Method**)jmid) = new_method;
2134 }
2135 
2136 bool Method::is_method_id(jmethodID mid) {
2137   Method* m = resolve_jmethod_id(mid);
2138   assert(m != NULL, "should be called with non-null method");
2139   InstanceKlass* ik = m->method_holder();
2140   ClassLoaderData* cld = ik->class_loader_data();
2141   if (cld->jmethod_ids() == NULL) return false;
2142   return (cld->jmethod_ids()->contains((Method**)mid));
2143 }
2144 
2145 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
2146   if (mid == NULL) return NULL;
2147   Method* o = resolve_jmethod_id(mid);
2148   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
2149     return NULL;
2150   }
2151   return o;
2152 };
2153 
2154 void Method::set_on_stack(const bool value) {
2155   // Set both the method itself and its constant pool.  The constant pool
2156   // on stack means some method referring to it is also on the stack.
2157   constants()->set_on_stack(value);
2158 
2159   bool already_set = on_stack();
2160   _access_flags.set_on_stack(value);
2161   if (value && !already_set) {
2162     MetadataOnStackMark::record(this);
2163   }
2164 }
2165 
2166 // Called when the class loader is unloaded to make all methods weak.
2167 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
2168   loader_data->jmethod_ids()->clear_all_methods();
2169 }
2170 
2171 bool Method::has_method_vptr(const void* ptr) {
2172   Method m;
2173   // This assumes that the vtbl pointer is the first word of a C++ object.
2174   return dereference_vptr(&m) == dereference_vptr(ptr);
2175 }
2176 
2177 // Check that this pointer is valid by checking that the vtbl pointer matches
2178 bool Method::is_valid_method() const {
2179   if (this == NULL) {
2180     return false;
2181   } else if ((intptr_t(this) & (wordSize-1)) != 0) {
2182     // Quick sanity check on pointer.
2183     return false;
2184   } else if (MetaspaceShared::is_in_shared_space(this)) {
2185     return MetaspaceShared::is_valid_shared_method(this);
2186   } else if (Metaspace::contains_non_shared(this)) {
2187     return has_method_vptr((const void*)this);
2188   } else {
2189     return false;
2190   }
2191 }
2192 
2193 #ifndef PRODUCT
2194 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
2195   out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
2196 }
2197 #endif // PRODUCT
2198 
2199 
2200 // Printing
2201 
2202 #ifndef PRODUCT
2203 
2204 void Method::print_on(outputStream* st) const {
2205   ResourceMark rm;
2206   assert(is_method(), "must be method");
2207   st->print_cr("%s", internal_name());
2208   st->print_cr(" - this oop:          " INTPTR_FORMAT, p2i(this));
2209   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
2210   st->print   (" - constants:         " INTPTR_FORMAT " ", p2i(constants()));
2211   constants()->print_value_on(st); st->cr();
2212   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2213   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
2214   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
2215   st->print_cr(" - max stack:         %d",   max_stack());
2216   st->print_cr(" - max locals:        %d",   max_locals());
2217   st->print_cr(" - size of params:    %d",   size_of_parameters());
2218   st->print_cr(" - method size:       %d",   method_size());
2219   if (intrinsic_id() != vmIntrinsics::_none)
2220     st->print_cr(" - intrinsic id:      %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
2221   if (highest_comp_level() != CompLevel_none)
2222     st->print_cr(" - highest level:     %d", highest_comp_level());
2223   st->print_cr(" - vtable index:      %d",   _vtable_index);
2224   st->print_cr(" - i2i entry:         " INTPTR_FORMAT, p2i(interpreter_entry()));
2225   st->print(   " - adapters:          ");
2226   AdapterHandlerEntry* a = ((Method*)this)->adapter();
2227   if (a == NULL)
2228     st->print_cr(INTPTR_FORMAT, p2i(a));
2229   else
2230     a->print_adapter_on(st);
2231   st->print_cr(" - compiled entry     " INTPTR_FORMAT, p2i(from_compiled_entry()));
2232   st->print_cr(" - code size:         %d",   code_size());
2233   if (code_size() != 0) {
2234     st->print_cr(" - code start:        " INTPTR_FORMAT, p2i(code_base()));
2235     st->print_cr(" - code end (excl):   " INTPTR_FORMAT, p2i(code_base() + code_size()));
2236   }
2237   if (method_data() != NULL) {
2238     st->print_cr(" - method data:       " INTPTR_FORMAT, p2i(method_data()));
2239   }
2240   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
2241   if (checked_exceptions_length() > 0) {
2242     CheckedExceptionElement* table = checked_exceptions_start();
2243     st->print_cr(" - checked ex start:  " INTPTR_FORMAT, p2i(table));
2244     if (Verbose) {
2245       for (int i = 0; i < checked_exceptions_length(); i++) {
2246         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2247       }
2248     }
2249   }
2250   if (has_linenumber_table()) {
2251     u_char* table = compressed_linenumber_table();
2252     st->print_cr(" - linenumber start:  " INTPTR_FORMAT, p2i(table));
2253     if (Verbose) {
2254       CompressedLineNumberReadStream stream(table);
2255       while (stream.read_pair()) {
2256         st->print_cr("   - line %d: %d", stream.line(), stream.bci());
2257       }
2258     }
2259   }
2260   st->print_cr(" - localvar length:   %d",   localvariable_table_length());
2261   if (localvariable_table_length() > 0) {
2262     LocalVariableTableElement* table = localvariable_table_start();
2263     st->print_cr(" - localvar start:    " INTPTR_FORMAT, p2i(table));
2264     if (Verbose) {
2265       for (int i = 0; i < localvariable_table_length(); i++) {
2266         int bci = table[i].start_bci;
2267         int len = table[i].length;
2268         const char* name = constants()->printable_name_at(table[i].name_cp_index);
2269         const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
2270         int slot = table[i].slot;
2271         st->print_cr("   - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
2272       }
2273     }
2274   }
2275   if (code() != NULL) {
2276     st->print   (" - compiled code: ");
2277     code()->print_value_on(st);
2278   }
2279   if (is_native()) {
2280     st->print_cr(" - native function:   " INTPTR_FORMAT, p2i(native_function()));
2281     st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler()));
2282   }
2283 }
2284 
2285 void Method::print_linkage_flags(outputStream* st) {
2286   access_flags().print_on(st);
2287   if (is_default_method()) {
2288     st->print("default ");
2289   }
2290   if (is_overpass()) {
2291     st->print("overpass ");
2292   }
2293 }
2294 #endif //PRODUCT
2295 
2296 void Method::print_value_on(outputStream* st) const {
2297   assert(is_method(), "must be method");
2298   st->print("%s", internal_name());
2299   print_address_on(st);
2300   st->print(" ");
2301   name()->print_value_on(st);
2302   st->print(" ");
2303   signature()->print_value_on(st);
2304   st->print(" in ");
2305   method_holder()->print_value_on(st);
2306   if (WizardMode) st->print("#%d", _vtable_index);
2307   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2308   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2309 }
2310 
2311 #if INCLUDE_SERVICES
2312 // Size Statistics
2313 void Method::collect_statistics(KlassSizeStats *sz) const {
2314   int mysize = sz->count(this);
2315   sz->_method_bytes += mysize;
2316   sz->_method_all_bytes += mysize;
2317   sz->_rw_bytes += mysize;
2318 
2319   if (constMethod()) {
2320     constMethod()->collect_statistics(sz);
2321   }
2322   if (method_data()) {
2323     method_data()->collect_statistics(sz);
2324   }
2325 }
2326 #endif // INCLUDE_SERVICES
2327 
2328 // LogTouchedMethods and PrintTouchedMethods
2329 
2330 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because
2331 // the Method may be garbage collected. Let's roll our own hash table.
2332 class TouchedMethodRecord : CHeapObj<mtTracing> {
2333 public:
2334   // It's OK to store Symbols here because they will NOT be GC'ed if
2335   // LogTouchedMethods is enabled.
2336   TouchedMethodRecord* _next;
2337   Symbol* _class_name;
2338   Symbol* _method_name;
2339   Symbol* _method_signature;
2340 };
2341 
2342 static const int TOUCHED_METHOD_TABLE_SIZE = 20011;
2343 static TouchedMethodRecord** _touched_method_table = NULL;
2344 
2345 void Method::log_touched(TRAPS) {
2346 
2347   const int table_size = TOUCHED_METHOD_TABLE_SIZE;
2348   Symbol* my_class = klass_name();
2349   Symbol* my_name  = name();
2350   Symbol* my_sig   = signature();
2351 
2352   unsigned int hash = my_class->identity_hash() +
2353                       my_name->identity_hash() +
2354                       my_sig->identity_hash();
2355   juint index = juint(hash) % table_size;
2356 
2357   MutexLocker ml(TouchedMethodLog_lock, THREAD);
2358   if (_touched_method_table == NULL) {
2359     _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size,
2360                                               mtTracing, CURRENT_PC);
2361     memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size);
2362   }
2363 
2364   TouchedMethodRecord* ptr = _touched_method_table[index];
2365   while (ptr) {
2366     if (ptr->_class_name       == my_class &&
2367         ptr->_method_name      == my_name &&
2368         ptr->_method_signature == my_sig) {
2369       return;
2370     }
2371     if (ptr->_next == NULL) break;
2372     ptr = ptr->_next;
2373   }
2374   TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing);
2375   my_class->set_permanent();  // prevent reclaimed by GC
2376   my_name->set_permanent();
2377   my_sig->set_permanent();
2378   nptr->_class_name         = my_class;
2379   nptr->_method_name        = my_name;
2380   nptr->_method_signature   = my_sig;
2381   nptr->_next               = NULL;
2382 
2383   if (ptr == NULL) {
2384     // first
2385     _touched_method_table[index] = nptr;
2386   } else {
2387     ptr->_next = nptr;
2388   }
2389 }
2390 
2391 void Method::print_touched_methods(outputStream* out) {
2392   MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock);
2393   out->print_cr("# Method::print_touched_methods version 1");
2394   if (_touched_method_table) {
2395     for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) {
2396       TouchedMethodRecord* ptr = _touched_method_table[i];
2397       while(ptr) {
2398         ptr->_class_name->print_symbol_on(out);       out->print(".");
2399         ptr->_method_name->print_symbol_on(out);      out->print(":");
2400         ptr->_method_signature->print_symbol_on(out); out->cr();
2401         ptr = ptr->_next;
2402       }
2403     }
2404   }
2405 }
2406 
2407 // Verification
2408 
2409 void Method::verify_on(outputStream* st) {
2410   guarantee(is_method(), "object must be method");
2411   guarantee(constants()->is_constantPool(), "should be constant pool");
2412   guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
2413   MethodData* md = method_data();
2414   guarantee(md == NULL ||
2415       md->is_methodData(), "should be method data");
2416 }
--- EOF ---