1 /*
   2  * Copyright (c) 1997, 2018, 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 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
  26 #define SHARE_VM_OOPS_METHODOOP_HPP
  27 
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/compressedStream.hpp"
  30 #include "compiler/compilerDefinitions.hpp"
  31 #include "compiler/oopMap.hpp"
  32 #include "interpreter/invocationCounter.hpp"
  33 #include "oops/annotations.hpp"
  34 #include "oops/constantPool.hpp"
  35 #include "oops/methodCounters.hpp"
  36 #include "oops/instanceKlass.hpp"
  37 #include "oops/oop.hpp"
  38 #include "oops/typeArrayOop.hpp"
  39 #include "utilities/accessFlags.hpp"
  40 #include "utilities/align.hpp"
  41 #include "utilities/growableArray.hpp"
  42 #include "utilities/macros.hpp"
  43 #if INCLUDE_JFR
  44 #include "jfr/support/jfrTraceIdExtension.hpp"
  45 #endif
  46 
  47 
  48 // A Method represents a Java method.
  49 //
  50 // Note that most applications load thousands of methods, so keeping the size of this
  51 // class small has a big impact on footprint.
  52 //
  53 // Note that native_function and signature_handler have to be at fixed offsets
  54 // (required by the interpreter)
  55 //
  56 //  Method embedded field layout (after declared fields):
  57 //   [EMBEDDED native_function       (present only if native) ]
  58 //   [EMBEDDED signature_handler     (present only if native) ]
  59 
  60 class CheckedExceptionElement;
  61 class LocalVariableTableElement;
  62 class AdapterHandlerEntry;
  63 class MethodData;
  64 class MethodCounters;
  65 class ConstMethod;
  66 class InlineTableSizes;
  67 class KlassSizeStats;
  68 class CompiledMethod;
  69 
  70 class Method : public Metadata {
  71  friend class VMStructs;
  72  friend class JVMCIVMStructs;
  73  private:
  74   // If you add a new field that points to any metaspace object, you
  75   // must add this field to Method::metaspace_pointers_do().
  76   ConstMethod*      _constMethod;                // Method read-only data.
  77   MethodData*       _method_data;
  78   MethodCounters*   _method_counters;
  79   AccessFlags       _access_flags;               // Access flags
  80   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  81                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  82   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  83 
  84   // Flags
  85   enum Flags {
  86     _caller_sensitive      = 1 << 0,
  87     _force_inline          = 1 << 1,
  88     _dont_inline           = 1 << 2,
  89     _hidden                = 1 << 3,
  90     _has_injected_profile  = 1 << 4,
  91     _running_emcp          = 1 << 5,
  92     _intrinsic_candidate   = 1 << 6,
  93     _reserved_stack_access = 1 << 7
  94   };
  95   mutable u2 _flags;
  96 
  97   JFR_ONLY(DEFINE_TRACE_FLAG;)
  98 
  99 #ifndef PRODUCT
 100   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 101 #endif
 102   // Entry point for calling both from and to the interpreter.
 103   address _i2i_entry;           // All-args-on-stack calling convention
 104   // Entry point for calling from compiled code, to compiled code if it exists
 105   // or else the interpreter.
 106   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 107   volatile address _from_compiled_value_entry;  // Cache of: _code ? _code->value_entry_point() : _adapter->c2i_value_entry()
 108   // The entry point for calling both from and to compiled code is
 109   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 110   // field can come and go.  It can transition from NULL to not-null at any
 111   // time (whenever a compile completes).  It can transition from not-null to
 112   // NULL only at safepoints (because of a de-opt).
 113   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 114   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 115   int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
 116 
 117 #if INCLUDE_AOT && defined(TIERED)
 118   CompiledMethod* _aot_code;
 119 #endif
 120 
 121   // Constructor
 122   Method(ConstMethod* xconst, AccessFlags access_flags);
 123  public:
 124 
 125   static Method* allocate(ClassLoaderData* loader_data,
 126                           int byte_code_size,
 127                           AccessFlags access_flags,
 128                           InlineTableSizes* sizes,
 129                           ConstMethod::MethodType method_type,
 130                           TRAPS);
 131 
 132   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 133   Method(){}
 134 
 135   bool is_method() const volatile { return true; }
 136 
 137   void restore_unshareable_info(TRAPS);
 138 
 139   // accessors for instance variables
 140 
 141   ConstMethod* constMethod() const             { return _constMethod; }
 142   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 143 
 144 
 145   static address make_adapters(const methodHandle& mh, TRAPS);
 146   address from_compiled_entry() const;
 147   address from_compiled_entry_no_trampoline() const;
 148   address from_interpreted_entry() const;
 149 
 150   // access flag
 151   AccessFlags access_flags() const               { return _access_flags;  }
 152   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 153 
 154   // name
 155   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 156   int name_index() const                         { return constMethod()->name_index();         }
 157   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 158 
 159   // signature
 160   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 161   int signature_index() const                    { return constMethod()->signature_index();         }
 162   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 163 
 164   // generics support
 165   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 166   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 167   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 168 
 169   // annotations support
 170   AnnotationArray* annotations() const           {
 171     return constMethod()->method_annotations();
 172   }
 173   AnnotationArray* parameter_annotations() const {
 174     return constMethod()->parameter_annotations();
 175   }
 176   AnnotationArray* annotation_default() const    {
 177     return constMethod()->default_annotations();
 178   }
 179   AnnotationArray* type_annotations() const      {
 180     return constMethod()->type_annotations();
 181   }
 182 
 183   // Helper routine: get klass name + "." + method name + signature as
 184   // C string, for the purpose of providing more useful NoSuchMethodErrors
 185   // and fatal error handling. The string is allocated in resource
 186   // area if a buffer is not provided by the caller.
 187   char* name_and_sig_as_C_string() const;
 188   char* name_and_sig_as_C_string(char* buf, int size) const;
 189 
 190   // Static routine in the situations we don't have a Method*
 191   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 192   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 193 
 194   Bytecodes::Code java_code_at(int bci) const {
 195     return Bytecodes::java_code_at(this, bcp_from(bci));
 196   }
 197   Bytecodes::Code code_at(int bci) const {
 198     return Bytecodes::code_at(this, bcp_from(bci));
 199   }
 200 
 201   // JVMTI breakpoints
 202 #if !INCLUDE_JVMTI
 203   Bytecodes::Code orig_bytecode_at(int bci) const {
 204     ShouldNotReachHere();
 205     return Bytecodes::_shouldnotreachhere;
 206   }
 207   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 208     ShouldNotReachHere();
 209   };
 210   u2   number_of_breakpoints() const {return 0;}
 211 #else // !INCLUDE_JVMTI
 212   Bytecodes::Code orig_bytecode_at(int bci) const;
 213   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 214   void set_breakpoint(int bci);
 215   void clear_breakpoint(int bci);
 216   void clear_all_breakpoints();
 217   // Tracking number of breakpoints, for fullspeed debugging.
 218   // Only mutated by VM thread.
 219   u2   number_of_breakpoints()             const {
 220     MethodCounters* mcs = method_counters();
 221     if (mcs == NULL) {
 222       return 0;
 223     } else {
 224       return mcs->number_of_breakpoints();
 225     }
 226   }
 227   void incr_number_of_breakpoints(TRAPS)         {
 228     MethodCounters* mcs = get_method_counters(CHECK);
 229     if (mcs != NULL) {
 230       mcs->incr_number_of_breakpoints();
 231     }
 232   }
 233   void decr_number_of_breakpoints(TRAPS)         {
 234     MethodCounters* mcs = get_method_counters(CHECK);
 235     if (mcs != NULL) {
 236       mcs->decr_number_of_breakpoints();
 237     }
 238   }
 239   // Initialization only
 240   void clear_number_of_breakpoints()             {
 241     MethodCounters* mcs = method_counters();
 242     if (mcs != NULL) {
 243       mcs->clear_number_of_breakpoints();
 244     }
 245   }
 246 #endif // !INCLUDE_JVMTI
 247 
 248   // index into InstanceKlass methods() array
 249   // note: also used by jfr
 250   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 251   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 252 
 253   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 254   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 255 
 256   // code size
 257   int code_size() const                  { return constMethod()->code_size(); }
 258 
 259   // method size in words
 260   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 261 
 262   // constant pool for Klass* holding this method
 263   ConstantPool* constants() const              { return constMethod()->constants(); }
 264   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 265 
 266   // max stack
 267   // return original max stack size for method verification
 268   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 269   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 270   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 271 
 272   // max locals
 273   int  max_locals() const                        { return constMethod()->max_locals(); }
 274   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 275 
 276   int highest_comp_level() const;
 277   void set_highest_comp_level(int level);
 278   int highest_osr_comp_level() const;
 279   void set_highest_osr_comp_level(int level);
 280 
 281 #if COMPILER2_OR_JVMCI
 282   // Count of times method was exited via exception while interpreting
 283   void interpreter_throwout_increment(TRAPS) {
 284     MethodCounters* mcs = get_method_counters(CHECK);
 285     if (mcs != NULL) {
 286       mcs->interpreter_throwout_increment();
 287     }
 288   }
 289 #endif
 290 
 291   int  interpreter_throwout_count() const        {
 292     MethodCounters* mcs = method_counters();
 293     if (mcs == NULL) {
 294       return 0;
 295     } else {
 296       return mcs->interpreter_throwout_count();
 297     }
 298   }
 299 
 300   // size of parameters
 301   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 302   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 303 
 304   bool has_stackmap_table() const {
 305     return constMethod()->has_stackmap_table();
 306   }
 307 
 308   Array<u1>* stackmap_data() const {
 309     return constMethod()->stackmap_data();
 310   }
 311 
 312   void set_stackmap_data(Array<u1>* sd) {
 313     constMethod()->set_stackmap_data(sd);
 314   }
 315 
 316   // exception handler table
 317   bool has_exception_handler() const
 318                              { return constMethod()->has_exception_handler(); }
 319   int exception_table_length() const
 320                              { return constMethod()->exception_table_length(); }
 321   ExceptionTableElement* exception_table_start() const
 322                              { return constMethod()->exception_table_start(); }
 323 
 324   // Finds the first entry point bci of an exception handler for an
 325   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 326   // for ex_klass indicates that the exception klass is not known; in
 327   // this case it matches any constraint class. Returns -1 if the
 328   // exception cannot be handled in this method. The handler
 329   // constraint classes are loaded if necessary. Note that this may
 330   // throw an exception if loading of the constraint classes causes
 331   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 332   // If an exception is thrown, returns the bci of the
 333   // exception handler which caused the exception to be thrown, which
 334   // is needed for proper retries. See, for example,
 335   // InterpreterRuntime::exception_handler_for_exception.
 336   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 337 
 338   // method data access
 339   MethodData* method_data() const              {
 340     return _method_data;
 341   }
 342 
 343   void set_method_data(MethodData* data);
 344 
 345   MethodCounters* method_counters() const {
 346     return _method_counters;
 347   }
 348 
 349   void clear_method_counters() {
 350     _method_counters = NULL;
 351   }
 352 
 353   bool init_method_counters(MethodCounters* counters);
 354 
 355 #ifdef TIERED
 356   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 357   // We can do that since interpreter_invocation_count is not used in tiered.
 358   int prev_event_count() const                   {
 359     if (method_counters() == NULL) {
 360       return 0;
 361     } else {
 362       return method_counters()->interpreter_invocation_count();
 363     }
 364   }
 365   void set_prev_event_count(int count) {
 366     MethodCounters* mcs = method_counters();
 367     if (mcs != NULL) {
 368       mcs->set_interpreter_invocation_count(count);
 369     }
 370   }
 371   jlong prev_time() const                        {
 372     MethodCounters* mcs = method_counters();
 373     return mcs == NULL ? 0 : mcs->prev_time();
 374   }
 375   void set_prev_time(jlong time) {
 376     MethodCounters* mcs = method_counters();
 377     if (mcs != NULL) {
 378       mcs->set_prev_time(time);
 379     }
 380   }
 381   float rate() const                             {
 382     MethodCounters* mcs = method_counters();
 383     return mcs == NULL ? 0 : mcs->rate();
 384   }
 385   void set_rate(float rate) {
 386     MethodCounters* mcs = method_counters();
 387     if (mcs != NULL) {
 388       mcs->set_rate(rate);
 389     }
 390   }
 391 
 392 #if INCLUDE_AOT
 393   void set_aot_code(CompiledMethod* aot_code) {
 394     _aot_code = aot_code;
 395   }
 396 
 397   CompiledMethod* aot_code() const {
 398     return _aot_code;
 399   }
 400 #else
 401   CompiledMethod* aot_code() const { return NULL; }
 402 #endif // INCLUDE_AOT
 403 #endif // TIERED
 404 
 405   int nmethod_age() const {
 406     if (method_counters() == NULL) {
 407       return INT_MAX;
 408     } else {
 409       return method_counters()->nmethod_age();
 410     }
 411   }
 412 
 413   int invocation_count();
 414   int backedge_count();
 415 
 416   bool was_executed_more_than(int n);
 417   bool was_never_executed()                      { return !was_executed_more_than(0); }
 418 
 419   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 420 
 421   static MethodCounters* build_method_counters(Method* m, TRAPS);
 422 
 423   int interpreter_invocation_count() {
 424     if (TieredCompilation) {
 425       return invocation_count();
 426     } else {
 427       MethodCounters* mcs = method_counters();
 428       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 429     }
 430   }
 431 #if COMPILER2_OR_JVMCI
 432   int increment_interpreter_invocation_count(TRAPS) {
 433     if (TieredCompilation) ShouldNotReachHere();
 434     MethodCounters* mcs = get_method_counters(CHECK_0);
 435     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 436   }
 437 #endif
 438 
 439 #ifndef PRODUCT
 440   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 441   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 442 #else
 443   // for PrintMethodData in a product build
 444   int  compiled_invocation_count() const         { return 0;  }
 445 #endif // not PRODUCT
 446 
 447   // Clear (non-shared space) pointers which could not be relevant
 448   // if this (shared) method were mapped into another JVM.
 449   void remove_unshareable_info();
 450 
 451   // nmethod/verified compiler entry
 452   address verified_code_entry();
 453   bool check_code() const;      // Not inline to avoid circular ref
 454   CompiledMethod* volatile code() const;
 455   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 456   static void set_code(const methodHandle& mh, CompiledMethod* code);
 457   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 458     constMethod()->set_adapter_entry(adapter);
 459   }
 460   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 461     constMethod()->update_adapter_trampoline(adapter);
 462   }
 463 
 464   address get_i2c_entry();
 465   address get_c2i_entry();
 466   address get_c2i_unverified_entry();
 467   AdapterHandlerEntry* adapter() const {
 468     return constMethod()->adapter();
 469   }
 470   // setup entry points
 471   void link_method(const methodHandle& method, TRAPS);
 472   // clear entry points. Used by sharing code during dump time
 473   void unlink_method() NOT_CDS_RETURN;
 474 
 475   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 476   virtual MetaspaceObj::Type type() const { return MethodType; }
 477 
 478   // vtable index
 479   enum VtableIndexFlag {
 480     // Valid vtable indexes are non-negative (>= 0).
 481     // These few negative values are used as sentinels.
 482     itable_index_max        = -10, // first itable index, growing downward
 483     pending_itable_index    = -9,  // itable index will be assigned
 484     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 485     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 486     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 487     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 488   };
 489   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 490   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 491   int  vtable_index() const                      { return _vtable_index; }
 492   void set_vtable_index(int index);
 493   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 494   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 495   int  itable_index() const                      { assert(valid_itable_index(), "");
 496                                                    return itable_index_max - _vtable_index; }
 497   void set_itable_index(int index);
 498 
 499   // interpreter entry
 500   address interpreter_entry() const              { return _i2i_entry; }
 501   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 502   void set_interpreter_entry(address entry) {
 503     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 504     if (_i2i_entry != entry) {
 505       _i2i_entry = entry;
 506     }
 507     if (_from_interpreted_entry != entry) {
 508       _from_interpreted_entry = entry;
 509     }
 510   }
 511 
 512   // native function (used for native methods only)
 513   enum {
 514     native_bind_event_is_interesting = true
 515   };
 516   address native_function() const                { return *(native_function_addr()); }
 517   address critical_native_function();
 518 
 519   // Must specify a real function (not NULL).
 520   // Use clear_native_function() to unregister.
 521   void set_native_function(address function, bool post_event_flag);
 522   bool has_native_function() const;
 523   void clear_native_function();
 524 
 525   // signature handler (used for native methods only)
 526   address signature_handler() const              { return *(signature_handler_addr()); }
 527   void set_signature_handler(address handler);
 528 
 529   // Interpreter oopmap support
 530   void mask_for(int bci, InterpreterOopMap* mask);
 531 
 532   // operations on invocation counter
 533   void print_invocation_count();
 534 
 535   // byte codes
 536   void    set_code(address code)      { return constMethod()->set_code(code); }
 537   address code_base() const           { return constMethod()->code_base(); }
 538   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 539 
 540   // prints byte codes
 541   void print_codes() const            { print_codes_on(tty); }
 542   void print_codes_on(outputStream* st) const;
 543   void print_codes_on(int from, int to, outputStream* st) const;
 544 
 545   // method parameters
 546   bool has_method_parameters() const
 547                          { return constMethod()->has_method_parameters(); }
 548   int method_parameters_length() const
 549                          { return constMethod()->method_parameters_length(); }
 550   MethodParametersElement* method_parameters_start() const
 551                           { return constMethod()->method_parameters_start(); }
 552 
 553   // checked exceptions
 554   int checked_exceptions_length() const
 555                          { return constMethod()->checked_exceptions_length(); }
 556   CheckedExceptionElement* checked_exceptions_start() const
 557                           { return constMethod()->checked_exceptions_start(); }
 558 
 559   // localvariable table
 560   bool has_localvariable_table() const
 561                           { return constMethod()->has_localvariable_table(); }
 562   int localvariable_table_length() const
 563                         { return constMethod()->localvariable_table_length(); }
 564   LocalVariableTableElement* localvariable_table_start() const
 565                          { return constMethod()->localvariable_table_start(); }
 566 
 567   bool has_linenumber_table() const
 568                               { return constMethod()->has_linenumber_table(); }
 569   u_char* compressed_linenumber_table() const
 570                        { return constMethod()->compressed_linenumber_table(); }
 571 
 572   // method holder (the Klass* holding this method)
 573   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 574 
 575   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 576   Symbol* klass_name() const;                    // returns the name of the method holder
 577   BasicType result_type() const;                 // type of the method result
 578   bool may_return_oop() const                    { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY ||  r == T_VALUETYPE); }
 579 #ifdef ASSERT
 580   ValueKlass* returned_value_type(Thread* thread) const;
 581 #endif
 582 
 583   // Support for scalarized value type calling convention
 584   bool has_scalarized_args() const;
 585   bool needs_stack_repair() const;
 586   SigEntry get_res_entry() const;
 587 
 588   // Checked exceptions thrown by this method (resolved to mirrors)
 589   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 590 
 591   // Access flags
 592   bool is_public() const                         { return access_flags().is_public();      }
 593   bool is_private() const                        { return access_flags().is_private();     }
 594   bool is_protected() const                      { return access_flags().is_protected();   }
 595   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 596   bool is_static() const                         { return access_flags().is_static();      }
 597   bool is_final() const                          { return access_flags().is_final();       }
 598   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 599   bool is_native() const                         { return access_flags().is_native();      }
 600   bool is_abstract() const                       { return access_flags().is_abstract();    }
 601   bool is_strict() const                         { return access_flags().is_strict();      }
 602   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 603 
 604   // returns true if contains only return operation
 605   bool is_empty_method() const;
 606 
 607   // returns true if this is a vanilla constructor
 608   bool is_vanilla_constructor() const;
 609 
 610   // checks method and its method holder
 611   bool is_final_method() const;
 612   bool is_final_method(AccessFlags class_access_flags) const;
 613   // interface method declared with 'default' - excludes private interface methods
 614   bool is_default_method() const;
 615 
 616   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 617   bool can_be_statically_bound() const;
 618   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 619 
 620   // returns true if the method has any backward branches.
 621   bool has_loops() {
 622     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 623   };
 624 
 625   bool compute_has_loops_flag();
 626 
 627   bool has_jsrs() {
 628     return access_flags().has_jsrs();
 629   };
 630   void set_has_jsrs() {
 631     _access_flags.set_has_jsrs();
 632   }
 633 
 634   // returns true if the method has any monitors.
 635   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 636   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 637 
 638   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 639 
 640   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 641   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 642   // has not been computed yet.
 643   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 644   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 645 
 646   // returns true if the method is an accessor function (setter/getter).
 647   bool is_accessor() const;
 648 
 649   // returns true if the method is a getter
 650   bool is_getter() const;
 651 
 652   // returns true if the method is a setter
 653   bool is_setter() const;
 654 
 655   // returns true if the method does nothing but return a constant of primitive type
 656   bool is_constant_getter() const;
 657 
 658   // returns true if the method is an initializer (<init> or <clinit>).
 659   bool is_initializer() const;
 660 
 661   // returns true if the method is static OR if the classfile version < 51
 662   bool has_valid_initializer_flags() const;
 663 
 664   // returns true if the method name is <clinit> and the method has
 665   // valid static initializer flags.
 666   bool is_static_initializer() const;
 667 
 668   // returns true if the method name is <init>
 669   bool is_object_initializer() const;
 670 
 671   // compiled code support
 672   // NOTE: code() is inherently racy as deopt can be clearing code
 673   // simultaneously. Use with caution.
 674   bool has_compiled_code() const;
 675 
 676 #ifdef TIERED
 677   bool has_aot_code() const                      { return aot_code() != NULL; }
 678 #endif
 679 
 680   // sizing
 681   static int header_size()                       {
 682     return align_up((int)sizeof(Method), wordSize) / wordSize;
 683   }
 684   static int size(bool is_native);
 685   int size() const                               { return method_size(); }
 686 #if INCLUDE_SERVICES
 687   void collect_statistics(KlassSizeStats *sz) const;
 688 #endif
 689   void log_touched(TRAPS);
 690   static void print_touched_methods(outputStream* out);
 691 
 692   // interpreter support
 693   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 694   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 695   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 696   static ByteSize from_compiled_value_offset()   { return byte_offset_of(Method, _from_compiled_value_entry); }
 697   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 698   static ByteSize flags_offset()                 { return byte_offset_of(Method, _flags); }
 699   static ByteSize method_data_offset()           {
 700     return byte_offset_of(Method, _method_data);
 701   }
 702   static ByteSize method_counters_offset()       {
 703     return byte_offset_of(Method, _method_counters);
 704   }
 705 #ifndef PRODUCT
 706   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 707 #endif // not PRODUCT
 708   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 709   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 710   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 711   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 712   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 713 
 714   // for code generation
 715   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 716   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 717   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 718 
 719   static ByteSize max_vt_buffer_offset()         { return byte_offset_of(Method, _max_vt_buffer); }
 720 
 721   // Static methods that are used to implement member methods where an exposed this pointer
 722   // is needed due to possible GCs
 723   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 724 
 725   // Returns the byte code index from the byte code pointer
 726   int     bci_from(address bcp) const;
 727   address bcp_from(int bci) const;
 728   address bcp_from(address bcp) const;
 729   int validate_bci_from_bcp(address bcp) const;
 730   int validate_bci(int bci) const;
 731 
 732   // Returns the line number for a bci if debugging information for the method is prowided,
 733   // -1 is returned otherwise.
 734   int line_number_from_bci(int bci) const;
 735 
 736   // Reflection support
 737   bool is_overridden_in(Klass* k) const;
 738 
 739   // Stack walking support
 740   bool is_ignored_by_security_stack_walk() const;
 741 
 742   // JSR 292 support
 743   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 744   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 745   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 746   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 747                                                    Symbol* signature, //anything at all
 748                                                    TRAPS);
 749   static Klass* check_non_bcp_klass(Klass* klass);
 750 
 751   enum {
 752     // How many extra stack entries for invokedynamic
 753     extra_stack_entries_for_jsr292 = 1
 754   };
 755 
 756   // this operates only on invoke methods:
 757   // presize interpreter frames for extra interpreter stack entries, if needed
 758   // Account for the extra appendix argument for invokehandle/invokedynamic
 759   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 760   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 761 
 762   // RedefineClasses() support:
 763   bool is_old() const                               { return access_flags().is_old(); }
 764   void set_is_old()                                 { _access_flags.set_is_old(); }
 765   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 766   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 767   bool is_deleted() const                           { return access_flags().is_deleted(); }
 768   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 769 
 770   bool is_running_emcp() const {
 771     // EMCP methods are old but not obsolete or deleted. Equivalent
 772     // Modulo Constant Pool means the method is equivalent except
 773     // the constant pool and instructions that access the constant
 774     // pool might be different.
 775     // If a breakpoint is set in a redefined method, its EMCP methods that are
 776     // still running must have a breakpoint also.
 777     return (_flags & _running_emcp) != 0;
 778   }
 779 
 780   void set_running_emcp(bool x) {
 781     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 782   }
 783 
 784   bool on_stack() const                             { return access_flags().on_stack(); }
 785   void set_on_stack(const bool value);
 786 
 787   // see the definition in Method*.cpp for the gory details
 788   bool should_not_be_cached() const;
 789 
 790   // JVMTI Native method prefixing support:
 791   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 792   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 793 
 794   // Rewriting support
 795   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 796                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 797 
 798   // jmethodID handling
 799   // Because the useful life-span of a jmethodID cannot be determined,
 800   // once created they are never reclaimed.  The methods to which they refer,
 801   // however, can be GC'ed away if the class is unloaded or if the method is
 802   // made obsolete or deleted -- in these cases, the jmethodID
 803   // refers to NULL (as is the case for any weak reference).
 804   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 805   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 806 
 807   // Ensure there is enough capacity in the internal tracking data
 808   // structures to hold the number of jmethodIDs you plan to generate.
 809   // This saves substantial time doing allocations.
 810   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 811 
 812   // Use resolve_jmethod_id() in situations where the caller is expected
 813   // to provide a valid jmethodID; the only sanity checks are in asserts;
 814   // result guaranteed not to be NULL.
 815   inline static Method* resolve_jmethod_id(jmethodID mid) {
 816     assert(mid != NULL, "JNI method id should not be null");
 817     return *((Method**)mid);
 818   }
 819 
 820   // Use checked_resolve_jmethod_id() in situations where the caller
 821   // should provide a valid jmethodID, but might not. NULL is returned
 822   // when the jmethodID does not refer to a valid method.
 823   static Method* checked_resolve_jmethod_id(jmethodID mid);
 824 
 825   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 826   static bool is_method_id(jmethodID mid);
 827 
 828   // Clear methods
 829   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 830   static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 831 
 832   // Get this method's jmethodID -- allocate if it doesn't exist
 833   jmethodID jmethod_id()                            { return method_holder()->get_jmethod_id(this); }
 834 
 835   // Lookup the jmethodID for this method.  Return NULL if not found.
 836   // NOTE that this function can be called from a signal handler
 837   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 838   // needs to be async-safe. No allocation should be done and
 839   // so handles are not used to avoid deadlock.
 840   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 841 
 842   // Support for inlining of intrinsic methods
 843   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 844   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 845 
 846   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 847   void init_intrinsic_id();     // updates from _none if a match
 848   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 849 
 850   bool caller_sensitive() {
 851     return (_flags & _caller_sensitive) != 0;
 852   }
 853   void set_caller_sensitive(bool x) {
 854     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 855   }
 856 
 857   bool force_inline() {
 858     return (_flags & _force_inline) != 0;
 859   }
 860   void set_force_inline(bool x) {
 861     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 862   }
 863 
 864   bool dont_inline() {
 865     return (_flags & _dont_inline) != 0;
 866   }
 867   void set_dont_inline(bool x) {
 868     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 869   }
 870 
 871   bool is_hidden() {
 872     return (_flags & _hidden) != 0;
 873   }
 874   void set_hidden(bool x) {
 875     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 876   }
 877 
 878   bool intrinsic_candidate() {
 879     return (_flags & _intrinsic_candidate) != 0;
 880   }
 881   void set_intrinsic_candidate(bool x) {
 882     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 883   }
 884 
 885   bool has_injected_profile() {
 886     return (_flags & _has_injected_profile) != 0;
 887   }
 888   void set_has_injected_profile(bool x) {
 889     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 890   }
 891 
 892   bool has_reserved_stack_access() {
 893     return (_flags & _reserved_stack_access) != 0;
 894   }
 895 
 896   void set_has_reserved_stack_access(bool x) {
 897     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 898   }
 899 
 900   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 901 
 902   ConstMethod::MethodType method_type() const {
 903       return _constMethod->method_type();
 904   }
 905   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 906 
 907   // On-stack replacement support
 908   bool has_osr_nmethod(int level, bool match_level) {
 909    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 910   }
 911 
 912   int mark_osr_nmethods() {
 913     return method_holder()->mark_osr_nmethods(this);
 914   }
 915 
 916   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 917     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 918   }
 919 
 920   // Find if klass for method is loaded
 921   bool is_klass_loaded_by_klass_index(int klass_index) const;
 922   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 923 
 924   // Indicates whether compilation failed earlier for this method, or
 925   // whether it is not compilable for another reason like having a
 926   // breakpoint set in it.
 927   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 928   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 929   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 930     set_not_compilable(comp_level, false);
 931   }
 932   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 933   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 934   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 935     set_not_osr_compilable(comp_level, false);
 936   }
 937   bool is_always_compilable() const;
 938 
 939  private:
 940   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 941 
 942  public:
 943   MethodCounters* get_method_counters(TRAPS) {
 944     if (_method_counters == NULL) {
 945       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 946     }
 947     return _method_counters;
 948   }
 949 
 950   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 951   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 952   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 953   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 954   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 955   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 956 
 957   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 958   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 959   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 960   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 961   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 962   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 963 
 964   // Background compilation support
 965   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 966   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 967   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 968 
 969   // Resolve all classes in signature, return 'true' if successful
 970   static bool load_signature_classes(const methodHandle& m, TRAPS);
 971 
 972   // Return if true if not all classes references in signature, including return type, has been loaded
 973   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 974 
 975   // Printing
 976   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 977 #if INCLUDE_JVMTI
 978   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 979 #else
 980   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 981 #endif
 982 
 983   // Helper routine used for method sorting
 984   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 985 
 986   // Deallocation function for redefine classes or if an error occurs
 987   void deallocate_contents(ClassLoaderData* loader_data);
 988 
 989   // Printing
 990 #ifndef PRODUCT
 991   void print_on(outputStream* st) const;
 992 #endif
 993   void print_value_on(outputStream* st) const;
 994   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
 995 
 996   const char* internal_name() const { return "{method}"; }
 997 
 998   // Check for valid method pointer
 999   static bool has_method_vptr(const void* ptr);
1000   static bool is_valid_method(const Method* m);
1001 
1002   // Verify
1003   void verify() { verify_on(tty); }
1004   void verify_on(outputStream* st);
1005 
1006  private:
1007 
1008   // Inlined elements
1009   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1010   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1011 };
1012 
1013 
1014 // Utility class for compressing line number tables
1015 
1016 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1017  private:
1018   int _bci;
1019   int _line;
1020  public:
1021   // Constructor
1022   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1023   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1024 
1025   // Write (bci, line number) pair to stream
1026   void write_pair_regular(int bci_delta, int line_delta);
1027 
1028   inline void write_pair_inline(int bci, int line) {
1029     int bci_delta = bci - _bci;
1030     int line_delta = line - _line;
1031     _bci = bci;
1032     _line = line;
1033     // Skip (0,0) deltas - they do not add information and conflict with terminator.
1034     if (bci_delta == 0 && line_delta == 0) return;
1035     // Check if bci is 5-bit and line number 3-bit unsigned.
1036     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1037       // Compress into single byte.
1038       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1039       // Check that value doesn't match escape character.
1040       if (value != 0xFF) {
1041         write_byte(value);
1042         return;
1043       }
1044     }
1045     write_pair_regular(bci_delta, line_delta);
1046   }
1047 
1048 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1049 // Disabling optimization doesn't work for methods in header files
1050 // so we force it to call through the non-optimized version in the .cpp.
1051 // It's gross, but it's the only way we can ensure that all callers are
1052 // fixed.  _MSC_VER is defined by the windows compiler
1053 #if defined(_M_AMD64) && _MSC_VER >= 1400
1054   void write_pair(int bci, int line);
1055 #else
1056   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1057 #endif
1058 
1059   // Write end-of-stream marker
1060   void write_terminator()                        { write_byte(0); }
1061 };
1062 
1063 
1064 // Utility class for decompressing line number tables
1065 
1066 class CompressedLineNumberReadStream: public CompressedReadStream {
1067  private:
1068   int _bci;
1069   int _line;
1070  public:
1071   // Constructor
1072   CompressedLineNumberReadStream(u_char* buffer);
1073   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1074   bool read_pair();
1075   // Accessing bci and line number (after calling read_pair)
1076   int bci() const                               { return _bci; }
1077   int line() const                              { return _line; }
1078 };
1079 
1080 
1081 #if INCLUDE_JVMTI
1082 
1083 /// Fast Breakpoints.
1084 
1085 // If this structure gets more complicated (because bpts get numerous),
1086 // move it into its own header.
1087 
1088 // There is presently no provision for concurrent access
1089 // to breakpoint lists, which is only OK for JVMTI because
1090 // breakpoints are written only at safepoints, and are read
1091 // concurrently only outside of safepoints.
1092 
1093 class BreakpointInfo : public CHeapObj<mtClass> {
1094   friend class VMStructs;
1095  private:
1096   Bytecodes::Code  _orig_bytecode;
1097   int              _bci;
1098   u2               _name_index;       // of method
1099   u2               _signature_index;  // of method
1100   BreakpointInfo*  _next;             // simple storage allocation
1101 
1102  public:
1103   BreakpointInfo(Method* m, int bci);
1104 
1105   // accessors
1106   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1107   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1108   int         bci()                                   { return _bci; }
1109 
1110   BreakpointInfo*          next() const               { return _next; }
1111   void                 set_next(BreakpointInfo* n)    { _next = n; }
1112 
1113   // helps for searchers
1114   bool match(const Method* m, int bci) {
1115     return bci == _bci && match(m);
1116   }
1117 
1118   bool match(const Method* m) {
1119     return _name_index == m->name_index() &&
1120       _signature_index == m->signature_index();
1121   }
1122 
1123   void set(Method* method);
1124   void clear(Method* method);
1125 };
1126 
1127 #endif // INCLUDE_JVMTI
1128 
1129 // Utility class for access exception handlers
1130 class ExceptionTable : public StackObj {
1131  private:
1132   ExceptionTableElement* _table;
1133   u2  _length;
1134 
1135  public:
1136   ExceptionTable(const Method* m) {
1137     if (m->has_exception_handler()) {
1138       _table = m->exception_table_start();
1139       _length = m->exception_table_length();
1140     } else {
1141       _table = NULL;
1142       _length = 0;
1143     }
1144   }
1145 
1146   int length() const {
1147     return _length;
1148   }
1149 
1150   u2 start_pc(int idx) const {
1151     assert(idx < _length, "out of bounds");
1152     return _table[idx].start_pc;
1153   }
1154 
1155   void set_start_pc(int idx, u2 value) {
1156     assert(idx < _length, "out of bounds");
1157     _table[idx].start_pc = value;
1158   }
1159 
1160   u2 end_pc(int idx) const {
1161     assert(idx < _length, "out of bounds");
1162     return _table[idx].end_pc;
1163   }
1164 
1165   void set_end_pc(int idx, u2 value) {
1166     assert(idx < _length, "out of bounds");
1167     _table[idx].end_pc = value;
1168   }
1169 
1170   u2 handler_pc(int idx) const {
1171     assert(idx < _length, "out of bounds");
1172     return _table[idx].handler_pc;
1173   }
1174 
1175   void set_handler_pc(int idx, u2 value) {
1176     assert(idx < _length, "out of bounds");
1177     _table[idx].handler_pc = value;
1178   }
1179 
1180   u2 catch_type_index(int idx) const {
1181     assert(idx < _length, "out of bounds");
1182     return _table[idx].catch_type_index;
1183   }
1184 
1185   void set_catch_type_index(int idx, u2 value) {
1186     assert(idx < _length, "out of bounds");
1187     _table[idx].catch_type_index = value;
1188   }
1189 };
1190 
1191 #endif // SHARE_VM_OOPS_METHODOOP_HPP