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     _is_returning_vt       = 1 << 8
  95   };
  96   mutable u2 _flags;
  97 
  98   JFR_ONLY(DEFINE_TRACE_FLAG;)
  99 
 100 #ifndef PRODUCT
 101   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 102 #endif
 103   // Entry point for calling both from and to the interpreter.
 104   address _i2i_entry;           // All-args-on-stack calling convention
 105   // Entry point for calling from compiled code, to compiled code if it exists
 106   // or else the interpreter.
 107   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 108   volatile address _from_compiled_value_entry;  // Cache of: _code ? _code->value_entry_point() : _adapter->c2i_entry()
 109   // The entry point for calling both from and to compiled code is
 110   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 111   // field can come and go.  It can transition from NULL to not-null at any
 112   // time (whenever a compile completes).  It can transition from not-null to
 113   // NULL only at safepoints (because of a de-opt).
 114   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 115   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 116   int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
 117 
 118 #if INCLUDE_AOT && defined(TIERED)
 119   CompiledMethod* _aot_code;
 120 #endif
 121 
 122   // Constructor
 123   Method(ConstMethod* xconst, AccessFlags access_flags);
 124  public:
 125 
 126   static Method* allocate(ClassLoaderData* loader_data,
 127                           int byte_code_size,
 128                           AccessFlags access_flags,
 129                           InlineTableSizes* sizes,
 130                           ConstMethod::MethodType method_type,
 131                           TRAPS);
 132 
 133   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 134   Method(){}
 135 
 136   bool is_method() const volatile { return true; }
 137 
 138   void restore_unshareable_info(TRAPS);
 139 
 140   // accessors for instance variables
 141 
 142   ConstMethod* constMethod() const             { return _constMethod; }
 143   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 144 
 145 
 146   static address make_adapters(const methodHandle& mh, TRAPS);
 147   address from_compiled_entry() const;
 148   address from_compiled_entry_no_trampoline() const;
 149   address from_interpreted_entry() const;
 150 
 151   // access flag
 152   AccessFlags access_flags() const               { return _access_flags;  }
 153   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 154 
 155   // name
 156   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 157   int name_index() const                         { return constMethod()->name_index();         }
 158   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 159 
 160   // signature
 161   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 162   int signature_index() const                    { return constMethod()->signature_index();         }
 163   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 164 
 165   // generics support
 166   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 167   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 168   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 169 
 170   // annotations support
 171   AnnotationArray* annotations() const           {
 172     return constMethod()->method_annotations();
 173   }
 174   AnnotationArray* parameter_annotations() const {
 175     return constMethod()->parameter_annotations();
 176   }
 177   AnnotationArray* annotation_default() const    {
 178     return constMethod()->default_annotations();
 179   }
 180   AnnotationArray* type_annotations() const      {
 181     return constMethod()->type_annotations();
 182   }
 183 
 184   // Helper routine: get klass name + "." + method name + signature as
 185   // C string, for the purpose of providing more useful NoSuchMethodErrors
 186   // and fatal error handling. The string is allocated in resource
 187   // area if a buffer is not provided by the caller.
 188   char* name_and_sig_as_C_string() const;
 189   char* name_and_sig_as_C_string(char* buf, int size) const;
 190 
 191   // Static routine in the situations we don't have a Method*
 192   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 193   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 194 
 195   Bytecodes::Code java_code_at(int bci) const {
 196     return Bytecodes::java_code_at(this, bcp_from(bci));
 197   }
 198   Bytecodes::Code code_at(int bci) const {
 199     return Bytecodes::code_at(this, bcp_from(bci));
 200   }
 201 
 202   // JVMTI breakpoints
 203 #if !INCLUDE_JVMTI
 204   Bytecodes::Code orig_bytecode_at(int bci) const {
 205     ShouldNotReachHere();
 206     return Bytecodes::_shouldnotreachhere;
 207   }
 208   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 209     ShouldNotReachHere();
 210   };
 211   u2   number_of_breakpoints() const {return 0;}
 212 #else // !INCLUDE_JVMTI
 213   Bytecodes::Code orig_bytecode_at(int bci) const;
 214   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 215   void set_breakpoint(int bci);
 216   void clear_breakpoint(int bci);
 217   void clear_all_breakpoints();
 218   // Tracking number of breakpoints, for fullspeed debugging.
 219   // Only mutated by VM thread.
 220   u2   number_of_breakpoints()             const {
 221     MethodCounters* mcs = method_counters();
 222     if (mcs == NULL) {
 223       return 0;
 224     } else {
 225       return mcs->number_of_breakpoints();
 226     }
 227   }
 228   void incr_number_of_breakpoints(TRAPS)         {
 229     MethodCounters* mcs = get_method_counters(CHECK);
 230     if (mcs != NULL) {
 231       mcs->incr_number_of_breakpoints();
 232     }
 233   }
 234   void decr_number_of_breakpoints(TRAPS)         {
 235     MethodCounters* mcs = get_method_counters(CHECK);
 236     if (mcs != NULL) {
 237       mcs->decr_number_of_breakpoints();
 238     }
 239   }
 240   // Initialization only
 241   void clear_number_of_breakpoints()             {
 242     MethodCounters* mcs = method_counters();
 243     if (mcs != NULL) {
 244       mcs->clear_number_of_breakpoints();
 245     }
 246   }
 247 #endif // !INCLUDE_JVMTI
 248 
 249   // index into InstanceKlass methods() array
 250   // note: also used by jfr
 251   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 252   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 253 
 254   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 255   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 256 
 257   // code size
 258   int code_size() const                  { return constMethod()->code_size(); }
 259 
 260   // method size in words
 261   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 262 
 263   // constant pool for Klass* holding this method
 264   ConstantPool* constants() const              { return constMethod()->constants(); }
 265   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 266 
 267   // max stack
 268   // return original max stack size for method verification
 269   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 270   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 271   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 272 
 273   // max locals
 274   int  max_locals() const                        { return constMethod()->max_locals(); }
 275   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 276 
 277   int highest_comp_level() const;
 278   void set_highest_comp_level(int level);
 279   int highest_osr_comp_level() const;
 280   void set_highest_osr_comp_level(int level);
 281 
 282 #if COMPILER2_OR_JVMCI
 283   // Count of times method was exited via exception while interpreting
 284   void interpreter_throwout_increment(TRAPS) {
 285     MethodCounters* mcs = get_method_counters(CHECK);
 286     if (mcs != NULL) {
 287       mcs->interpreter_throwout_increment();
 288     }
 289   }
 290 #endif
 291 
 292   int  interpreter_throwout_count() const        {
 293     MethodCounters* mcs = method_counters();
 294     if (mcs == NULL) {
 295       return 0;
 296     } else {
 297       return mcs->interpreter_throwout_count();
 298     }
 299   }
 300 
 301   // size of parameters
 302   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 303   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 304 
 305   bool has_stackmap_table() const {
 306     return constMethod()->has_stackmap_table();
 307   }
 308 
 309   Array<u1>* stackmap_data() const {
 310     return constMethod()->stackmap_data();
 311   }
 312 
 313   void set_stackmap_data(Array<u1>* sd) {
 314     constMethod()->set_stackmap_data(sd);
 315   }
 316 
 317   // exception handler table
 318   bool has_exception_handler() const
 319                              { return constMethod()->has_exception_handler(); }
 320   int exception_table_length() const
 321                              { return constMethod()->exception_table_length(); }
 322   ExceptionTableElement* exception_table_start() const
 323                              { return constMethod()->exception_table_start(); }
 324 
 325   // Finds the first entry point bci of an exception handler for an
 326   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 327   // for ex_klass indicates that the exception klass is not known; in
 328   // this case it matches any constraint class. Returns -1 if the
 329   // exception cannot be handled in this method. The handler
 330   // constraint classes are loaded if necessary. Note that this may
 331   // throw an exception if loading of the constraint classes causes
 332   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 333   // If an exception is thrown, returns the bci of the
 334   // exception handler which caused the exception to be thrown, which
 335   // is needed for proper retries. See, for example,
 336   // InterpreterRuntime::exception_handler_for_exception.
 337   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 338 
 339   // method data access
 340   MethodData* method_data() const              {
 341     return _method_data;
 342   }
 343 
 344   void set_method_data(MethodData* data);
 345 
 346   MethodCounters* method_counters() const {
 347     return _method_counters;
 348   }
 349 
 350   void clear_method_counters() {
 351     _method_counters = NULL;
 352   }
 353 
 354   bool init_method_counters(MethodCounters* counters);
 355 
 356 #ifdef TIERED
 357   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 358   // We can do that since interpreter_invocation_count is not used in tiered.
 359   int prev_event_count() const                   {
 360     if (method_counters() == NULL) {
 361       return 0;
 362     } else {
 363       return method_counters()->interpreter_invocation_count();
 364     }
 365   }
 366   void set_prev_event_count(int count) {
 367     MethodCounters* mcs = method_counters();
 368     if (mcs != NULL) {
 369       mcs->set_interpreter_invocation_count(count);
 370     }
 371   }
 372   jlong prev_time() const                        {
 373     MethodCounters* mcs = method_counters();
 374     return mcs == NULL ? 0 : mcs->prev_time();
 375   }
 376   void set_prev_time(jlong time) {
 377     MethodCounters* mcs = method_counters();
 378     if (mcs != NULL) {
 379       mcs->set_prev_time(time);
 380     }
 381   }
 382   float rate() const                             {
 383     MethodCounters* mcs = method_counters();
 384     return mcs == NULL ? 0 : mcs->rate();
 385   }
 386   void set_rate(float rate) {
 387     MethodCounters* mcs = method_counters();
 388     if (mcs != NULL) {
 389       mcs->set_rate(rate);
 390     }
 391   }
 392 
 393 #if INCLUDE_AOT
 394   void set_aot_code(CompiledMethod* aot_code) {
 395     _aot_code = aot_code;
 396   }
 397 
 398   CompiledMethod* aot_code() const {
 399     return _aot_code;
 400   }
 401 #else
 402   CompiledMethod* aot_code() const { return NULL; }
 403 #endif // INCLUDE_AOT
 404 #endif // TIERED
 405 
 406   int nmethod_age() const {
 407     if (method_counters() == NULL) {
 408       return INT_MAX;
 409     } else {
 410       return method_counters()->nmethod_age();
 411     }
 412   }
 413 
 414   int invocation_count();
 415   int backedge_count();
 416 
 417   bool was_executed_more_than(int n);
 418   bool was_never_executed()                      { return !was_executed_more_than(0); }
 419 
 420   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 421 
 422   static MethodCounters* build_method_counters(Method* m, TRAPS);
 423 
 424   int interpreter_invocation_count() {
 425     if (TieredCompilation) {
 426       return invocation_count();
 427     } else {
 428       MethodCounters* mcs = method_counters();
 429       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 430     }
 431   }
 432 #if COMPILER2_OR_JVMCI
 433   int increment_interpreter_invocation_count(TRAPS) {
 434     if (TieredCompilation) ShouldNotReachHere();
 435     MethodCounters* mcs = get_method_counters(CHECK_0);
 436     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 437   }
 438 #endif
 439 
 440 #ifndef PRODUCT
 441   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 442   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 443 #else
 444   // for PrintMethodData in a product build
 445   int  compiled_invocation_count() const         { return 0;  }
 446 #endif // not PRODUCT
 447 
 448   // Clear (non-shared space) pointers which could not be relevant
 449   // if this (shared) method were mapped into another JVM.
 450   void remove_unshareable_info();
 451 
 452   // nmethod/verified compiler entry
 453   address verified_code_entry();
 454   bool check_code() const;      // Not inline to avoid circular ref
 455   CompiledMethod* volatile code() const;
 456   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 457   static void set_code(const methodHandle& mh, CompiledMethod* code);
 458   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 459     constMethod()->set_adapter_entry(adapter);
 460   }
 461   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 462     constMethod()->update_adapter_trampoline(adapter);
 463   }
 464 
 465   address get_i2c_entry();
 466   address get_c2i_entry();
 467   address get_c2i_unverified_entry();
 468   AdapterHandlerEntry* adapter() const {
 469     return constMethod()->adapter();
 470   }
 471   // setup entry points
 472   void link_method(const methodHandle& method, TRAPS);
 473   // clear entry points. Used by sharing code during dump time
 474   void unlink_method() NOT_CDS_RETURN;
 475 
 476   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 477   virtual MetaspaceObj::Type type() const { return MethodType; }
 478 
 479   // vtable index
 480   enum VtableIndexFlag {
 481     // Valid vtable indexes are non-negative (>= 0).
 482     // These few negative values are used as sentinels.
 483     itable_index_max        = -10, // first itable index, growing downward
 484     pending_itable_index    = -9,  // itable index will be assigned
 485     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 486     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 487     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 488     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 489   };
 490   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 491   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 492   int  vtable_index() const                      { return _vtable_index; }
 493   void set_vtable_index(int index);
 494   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 495   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 496   int  itable_index() const                      { assert(valid_itable_index(), "");
 497                                                    return itable_index_max - _vtable_index; }
 498   void set_itable_index(int index);
 499 
 500   // interpreter entry
 501   address interpreter_entry() const              { return _i2i_entry; }
 502   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 503   void set_interpreter_entry(address entry) {
 504     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 505     if (_i2i_entry != entry) {
 506       _i2i_entry = entry;
 507     }
 508     if (_from_interpreted_entry != entry) {
 509       _from_interpreted_entry = entry;
 510     }
 511   }
 512 
 513   // native function (used for native methods only)
 514   enum {
 515     native_bind_event_is_interesting = true
 516   };
 517   address native_function() const                { return *(native_function_addr()); }
 518   address critical_native_function();
 519 
 520   // Must specify a real function (not NULL).
 521   // Use clear_native_function() to unregister.
 522   void set_native_function(address function, bool post_event_flag);
 523   bool has_native_function() const;
 524   void clear_native_function();
 525 
 526   // signature handler (used for native methods only)
 527   address signature_handler() const              { return *(signature_handler_addr()); }
 528   void set_signature_handler(address handler);
 529 
 530   // Interpreter oopmap support
 531   void mask_for(int bci, InterpreterOopMap* mask);
 532 
 533   // operations on invocation counter
 534   void print_invocation_count();
 535 
 536   // byte codes
 537   void    set_code(address code)      { return constMethod()->set_code(code); }
 538   address code_base() const           { return constMethod()->code_base(); }
 539   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 540 
 541   // prints byte codes
 542   void print_codes() const            { print_codes_on(tty); }
 543   void print_codes_on(outputStream* st) const;
 544   void print_codes_on(int from, int to, outputStream* st) const;
 545 
 546   // method parameters
 547   bool has_method_parameters() const
 548                          { return constMethod()->has_method_parameters(); }
 549   int method_parameters_length() const
 550                          { return constMethod()->method_parameters_length(); }
 551   MethodParametersElement* method_parameters_start() const
 552                           { return constMethod()->method_parameters_start(); }
 553 
 554   // checked exceptions
 555   int checked_exceptions_length() const
 556                          { return constMethod()->checked_exceptions_length(); }
 557   CheckedExceptionElement* checked_exceptions_start() const
 558                           { return constMethod()->checked_exceptions_start(); }
 559 
 560   // localvariable table
 561   bool has_localvariable_table() const
 562                           { return constMethod()->has_localvariable_table(); }
 563   int localvariable_table_length() const
 564                         { return constMethod()->localvariable_table_length(); }
 565   LocalVariableTableElement* localvariable_table_start() const
 566                          { return constMethod()->localvariable_table_start(); }
 567 
 568   bool has_linenumber_table() const
 569                               { return constMethod()->has_linenumber_table(); }
 570   u_char* compressed_linenumber_table() const
 571                        { return constMethod()->compressed_linenumber_table(); }
 572 
 573   // method holder (the Klass* holding this method)
 574   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 575 
 576   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 577   Symbol* klass_name() const;                    // returns the name of the method holder
 578   BasicType result_type() const;                 // type of the method result
 579   bool may_return_oop() const                    { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY ||  r == T_VALUETYPE); }
 580 #ifdef ASSERT
 581   ValueKlass* returned_value_type(Thread* thread) const;
 582 #endif
 583   bool has_value_args() const;
 584 
 585   // Checked exceptions thrown by this method (resolved to mirrors)
 586   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 587 
 588   // Access flags
 589   bool is_public() const                         { return access_flags().is_public();      }
 590   bool is_private() const                        { return access_flags().is_private();     }
 591   bool is_protected() const                      { return access_flags().is_protected();   }
 592   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 593   bool is_static() const                         { return access_flags().is_static();      }
 594   bool is_final() const                          { return access_flags().is_final();       }
 595   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 596   bool is_native() const                         { return access_flags().is_native();      }
 597   bool is_abstract() const                       { return access_flags().is_abstract();    }
 598   bool is_strict() const                         { return access_flags().is_strict();      }
 599   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 600 
 601   // returns true if contains only return operation
 602   bool is_empty_method() const;
 603 
 604   // returns true if this is a vanilla constructor
 605   bool is_vanilla_constructor() const;
 606 
 607   // checks method and its method holder
 608   bool is_final_method() const;
 609   bool is_final_method(AccessFlags class_access_flags) const;
 610   // interface method declared with 'default' - excludes private interface methods
 611   bool is_default_method() const;
 612 
 613   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 614   bool can_be_statically_bound() const;
 615   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 616 
 617   // returns true if the method has any backward branches.
 618   bool has_loops() {
 619     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 620   };
 621 
 622   bool compute_has_loops_flag();
 623 
 624   bool has_jsrs() {
 625     return access_flags().has_jsrs();
 626   };
 627   void set_has_jsrs() {
 628     _access_flags.set_has_jsrs();
 629   }
 630 
 631   // returns true if the method has any monitors.
 632   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 633   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 634 
 635   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 636 
 637   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 638   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 639   // has not been computed yet.
 640   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 641   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 642 
 643   // returns true if the method is an accessor function (setter/getter).
 644   bool is_accessor() const;
 645 
 646   // returns true if the method is a getter
 647   bool is_getter() const;
 648 
 649   // returns true if the method is a setter
 650   bool is_setter() const;
 651 
 652   // returns true if the method does nothing but return a constant of primitive type
 653   bool is_constant_getter() const;
 654 
 655   // returns true if the method is an initializer (<init> or <clinit>).
 656   bool is_initializer() const;
 657 
 658   // returns true if the method is static OR if the classfile version < 51
 659   bool has_valid_initializer_flags() const;
 660 
 661   // returns true if the method name is <clinit> and the method has
 662   // valid static initializer flags.
 663   bool is_static_initializer() const;
 664 
 665   // returns true if the method name is <init>
 666   bool is_object_initializer() const;
 667 
 668   // compiled code support
 669   // NOTE: code() is inherently racy as deopt can be clearing code
 670   // simultaneously. Use with caution.
 671   bool has_compiled_code() const;
 672 
 673 #ifdef TIERED
 674   bool has_aot_code() const                      { return aot_code() != NULL; }
 675 #endif
 676 
 677   // sizing
 678   static int header_size()                       {
 679     return align_up((int)sizeof(Method), wordSize) / wordSize;
 680   }
 681   static int size(bool is_native);
 682   int size() const                               { return method_size(); }
 683 #if INCLUDE_SERVICES
 684   void collect_statistics(KlassSizeStats *sz) const;
 685 #endif
 686   void log_touched(TRAPS);
 687   static void print_touched_methods(outputStream* out);
 688 
 689   // interpreter support
 690   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 691   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 692   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 693   static ByteSize from_compiled_value_offset()   { return byte_offset_of(Method, _from_compiled_value_entry); }
 694   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 695   static ByteSize flags_offset()                 { return byte_offset_of(Method, _flags); }
 696   static ByteSize method_data_offset()           {
 697     return byte_offset_of(Method, _method_data);
 698   }
 699   static ByteSize method_counters_offset()       {
 700     return byte_offset_of(Method, _method_counters);
 701   }
 702 #ifndef PRODUCT
 703   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 704 #endif // not PRODUCT
 705   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 706   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 707   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 708   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 709   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 710 
 711   // for code generation
 712   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 713   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 714   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 715 
 716   static ByteSize max_vt_buffer_offset()         { return byte_offset_of(Method, _max_vt_buffer); }
 717 
 718   // Static methods that are used to implement member methods where an exposed this pointer
 719   // is needed due to possible GCs
 720   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 721 
 722   // Returns the byte code index from the byte code pointer
 723   int     bci_from(address bcp) const;
 724   address bcp_from(int bci) const;
 725   address bcp_from(address bcp) const;
 726   int validate_bci_from_bcp(address bcp) const;
 727   int validate_bci(int bci) const;
 728 
 729   // Returns the line number for a bci if debugging information for the method is prowided,
 730   // -1 is returned otherwise.
 731   int line_number_from_bci(int bci) const;
 732 
 733   // Reflection support
 734   bool is_overridden_in(Klass* k) const;
 735 
 736   // Stack walking support
 737   bool is_ignored_by_security_stack_walk() const;
 738 
 739   // JSR 292 support
 740   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 741   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 742   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 743   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 744                                                    Symbol* signature, //anything at all
 745                                                    TRAPS);
 746   static Klass* check_non_bcp_klass(Klass* klass);
 747 
 748   enum {
 749     // How many extra stack entries for invokedynamic
 750     extra_stack_entries_for_jsr292 = 1
 751   };
 752 
 753   // this operates only on invoke methods:
 754   // presize interpreter frames for extra interpreter stack entries, if needed
 755   // Account for the extra appendix argument for invokehandle/invokedynamic
 756   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 757   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 758 
 759   // RedefineClasses() support:
 760   bool is_old() const                               { return access_flags().is_old(); }
 761   void set_is_old()                                 { _access_flags.set_is_old(); }
 762   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 763   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 764   bool is_deleted() const                           { return access_flags().is_deleted(); }
 765   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 766 
 767   bool is_running_emcp() const {
 768     // EMCP methods are old but not obsolete or deleted. Equivalent
 769     // Modulo Constant Pool means the method is equivalent except
 770     // the constant pool and instructions that access the constant
 771     // pool might be different.
 772     // If a breakpoint is set in a redefined method, its EMCP methods that are
 773     // still running must have a breakpoint also.
 774     return (_flags & _running_emcp) != 0;
 775   }
 776 
 777   void set_running_emcp(bool x) {
 778     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 779   }
 780 
 781   bool on_stack() const                             { return access_flags().on_stack(); }
 782   void set_on_stack(const bool value);
 783 
 784   // see the definition in Method*.cpp for the gory details
 785   bool should_not_be_cached() const;
 786 
 787   // JVMTI Native method prefixing support:
 788   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 789   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 790 
 791   // Rewriting support
 792   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 793                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 794 
 795   // jmethodID handling
 796   // Because the useful life-span of a jmethodID cannot be determined,
 797   // once created they are never reclaimed.  The methods to which they refer,
 798   // however, can be GC'ed away if the class is unloaded or if the method is
 799   // made obsolete or deleted -- in these cases, the jmethodID
 800   // refers to NULL (as is the case for any weak reference).
 801   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 802   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 803 
 804   // Ensure there is enough capacity in the internal tracking data
 805   // structures to hold the number of jmethodIDs you plan to generate.
 806   // This saves substantial time doing allocations.
 807   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 808 
 809   // Use resolve_jmethod_id() in situations where the caller is expected
 810   // to provide a valid jmethodID; the only sanity checks are in asserts;
 811   // result guaranteed not to be NULL.
 812   inline static Method* resolve_jmethod_id(jmethodID mid) {
 813     assert(mid != NULL, "JNI method id should not be null");
 814     return *((Method**)mid);
 815   }
 816 
 817   // Use checked_resolve_jmethod_id() in situations where the caller
 818   // should provide a valid jmethodID, but might not. NULL is returned
 819   // when the jmethodID does not refer to a valid method.
 820   static Method* checked_resolve_jmethod_id(jmethodID mid);
 821 
 822   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 823   static bool is_method_id(jmethodID mid);
 824 
 825   // Clear methods
 826   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 827   static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 828 
 829   // Get this method's jmethodID -- allocate if it doesn't exist
 830   jmethodID jmethod_id()                            { return method_holder()->get_jmethod_id(this); }
 831 
 832   // Lookup the jmethodID for this method.  Return NULL if not found.
 833   // NOTE that this function can be called from a signal handler
 834   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 835   // needs to be async-safe. No allocation should be done and
 836   // so handles are not used to avoid deadlock.
 837   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 838 
 839   // Support for inlining of intrinsic methods
 840   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 841   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 842 
 843   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 844   void init_intrinsic_id();     // updates from _none if a match
 845   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 846 
 847   bool caller_sensitive() {
 848     return (_flags & _caller_sensitive) != 0;
 849   }
 850   void set_caller_sensitive(bool x) {
 851     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 852   }
 853 
 854   bool force_inline() {
 855     return (_flags & _force_inline) != 0;
 856   }
 857   void set_force_inline(bool x) {
 858     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 859   }
 860 
 861   bool dont_inline() {
 862     return (_flags & _dont_inline) != 0;
 863   }
 864   void set_dont_inline(bool x) {
 865     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 866   }
 867 
 868   bool is_hidden() {
 869     return (_flags & _hidden) != 0;
 870   }
 871   void set_hidden(bool x) {
 872     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 873   }
 874 
 875   bool intrinsic_candidate() {
 876     return (_flags & _intrinsic_candidate) != 0;
 877   }
 878   void set_intrinsic_candidate(bool x) {
 879     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 880   }
 881 
 882   bool has_injected_profile() {
 883     return (_flags & _has_injected_profile) != 0;
 884   }
 885   void set_has_injected_profile(bool x) {
 886     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 887   }
 888 
 889   bool has_reserved_stack_access() {
 890     return (_flags & _reserved_stack_access) != 0;
 891   }
 892 
 893   void set_has_reserved_stack_access(bool x) {
 894     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 895   }
 896 
 897   static int is_returning_vt_mask() {
 898     return _is_returning_vt;
 899   }
 900 
 901   bool is_returning_vt() const {
 902     return (_flags & _is_returning_vt) != 0;
 903   }
 904 
 905   void set_is_returning_vt() {
 906     _flags |= _is_returning_vt;
 907   }
 908 
 909   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 910 
 911   ConstMethod::MethodType method_type() const {
 912       return _constMethod->method_type();
 913   }
 914   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 915 
 916   // On-stack replacement support
 917   bool has_osr_nmethod(int level, bool match_level) {
 918    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 919   }
 920 
 921   int mark_osr_nmethods() {
 922     return method_holder()->mark_osr_nmethods(this);
 923   }
 924 
 925   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 926     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 927   }
 928 
 929   // Find if klass for method is loaded
 930   bool is_klass_loaded_by_klass_index(int klass_index) const;
 931   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 932 
 933   // Indicates whether compilation failed earlier for this method, or
 934   // whether it is not compilable for another reason like having a
 935   // breakpoint set in it.
 936   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 937   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 938   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 939     set_not_compilable(comp_level, false);
 940   }
 941   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 942   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 943   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 944     set_not_osr_compilable(comp_level, false);
 945   }
 946   bool is_always_compilable() const;
 947 
 948  private:
 949   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 950 
 951  public:
 952   MethodCounters* get_method_counters(TRAPS) {
 953     if (_method_counters == NULL) {
 954       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 955     }
 956     return _method_counters;
 957   }
 958 
 959   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 960   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 961   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 962   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 963   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 964   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 965 
 966   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 967   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 968   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 969   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 970   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 971   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 972 
 973   // Background compilation support
 974   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 975   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 976   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 977 
 978   // Resolve all classes in signature, return 'true' if successful
 979   static bool load_signature_classes(const methodHandle& m, TRAPS);
 980 
 981   // Return if true if not all classes references in signature, including return type, has been loaded
 982   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 983 
 984   // Printing
 985   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 986 #if INCLUDE_JVMTI
 987   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 988 #else
 989   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 990 #endif
 991 
 992   // Helper routine used for method sorting
 993   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 994 
 995   // Deallocation function for redefine classes or if an error occurs
 996   void deallocate_contents(ClassLoaderData* loader_data);
 997 
 998   // Printing
 999 #ifndef PRODUCT
1000   void print_on(outputStream* st) const;
1001 #endif
1002   void print_value_on(outputStream* st) const;
1003   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1004 
1005   const char* internal_name() const { return "{method}"; }
1006 
1007   // Check for valid method pointer
1008   static bool has_method_vptr(const void* ptr);
1009   static bool is_valid_method(const Method* m);
1010 
1011   // Verify
1012   void verify() { verify_on(tty); }
1013   void verify_on(outputStream* st);
1014 
1015  private:
1016 
1017   // Inlined elements
1018   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1019   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1020 };
1021 
1022 
1023 // Utility class for compressing line number tables
1024 
1025 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1026  private:
1027   int _bci;
1028   int _line;
1029  public:
1030   // Constructor
1031   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1032   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1033 
1034   // Write (bci, line number) pair to stream
1035   void write_pair_regular(int bci_delta, int line_delta);
1036 
1037   inline void write_pair_inline(int bci, int line) {
1038     int bci_delta = bci - _bci;
1039     int line_delta = line - _line;
1040     _bci = bci;
1041     _line = line;
1042     // Skip (0,0) deltas - they do not add information and conflict with terminator.
1043     if (bci_delta == 0 && line_delta == 0) return;
1044     // Check if bci is 5-bit and line number 3-bit unsigned.
1045     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1046       // Compress into single byte.
1047       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1048       // Check that value doesn't match escape character.
1049       if (value != 0xFF) {
1050         write_byte(value);
1051         return;
1052       }
1053     }
1054     write_pair_regular(bci_delta, line_delta);
1055   }
1056 
1057 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1058 // Disabling optimization doesn't work for methods in header files
1059 // so we force it to call through the non-optimized version in the .cpp.
1060 // It's gross, but it's the only way we can ensure that all callers are
1061 // fixed.  _MSC_VER is defined by the windows compiler
1062 #if defined(_M_AMD64) && _MSC_VER >= 1400
1063   void write_pair(int bci, int line);
1064 #else
1065   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1066 #endif
1067 
1068   // Write end-of-stream marker
1069   void write_terminator()                        { write_byte(0); }
1070 };
1071 
1072 
1073 // Utility class for decompressing line number tables
1074 
1075 class CompressedLineNumberReadStream: public CompressedReadStream {
1076  private:
1077   int _bci;
1078   int _line;
1079  public:
1080   // Constructor
1081   CompressedLineNumberReadStream(u_char* buffer);
1082   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1083   bool read_pair();
1084   // Accessing bci and line number (after calling read_pair)
1085   int bci() const                               { return _bci; }
1086   int line() const                              { return _line; }
1087 };
1088 
1089 
1090 #if INCLUDE_JVMTI
1091 
1092 /// Fast Breakpoints.
1093 
1094 // If this structure gets more complicated (because bpts get numerous),
1095 // move it into its own header.
1096 
1097 // There is presently no provision for concurrent access
1098 // to breakpoint lists, which is only OK for JVMTI because
1099 // breakpoints are written only at safepoints, and are read
1100 // concurrently only outside of safepoints.
1101 
1102 class BreakpointInfo : public CHeapObj<mtClass> {
1103   friend class VMStructs;
1104  private:
1105   Bytecodes::Code  _orig_bytecode;
1106   int              _bci;
1107   u2               _name_index;       // of method
1108   u2               _signature_index;  // of method
1109   BreakpointInfo*  _next;             // simple storage allocation
1110 
1111  public:
1112   BreakpointInfo(Method* m, int bci);
1113 
1114   // accessors
1115   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1116   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1117   int         bci()                                   { return _bci; }
1118 
1119   BreakpointInfo*          next() const               { return _next; }
1120   void                 set_next(BreakpointInfo* n)    { _next = n; }
1121 
1122   // helps for searchers
1123   bool match(const Method* m, int bci) {
1124     return bci == _bci && match(m);
1125   }
1126 
1127   bool match(const Method* m) {
1128     return _name_index == m->name_index() &&
1129       _signature_index == m->signature_index();
1130   }
1131 
1132   void set(Method* method);
1133   void clear(Method* method);
1134 };
1135 
1136 #endif // INCLUDE_JVMTI
1137 
1138 // Utility class for access exception handlers
1139 class ExceptionTable : public StackObj {
1140  private:
1141   ExceptionTableElement* _table;
1142   u2  _length;
1143 
1144  public:
1145   ExceptionTable(const Method* m) {
1146     if (m->has_exception_handler()) {
1147       _table = m->exception_table_start();
1148       _length = m->exception_table_length();
1149     } else {
1150       _table = NULL;
1151       _length = 0;
1152     }
1153   }
1154 
1155   int length() const {
1156     return _length;
1157   }
1158 
1159   u2 start_pc(int idx) const {
1160     assert(idx < _length, "out of bounds");
1161     return _table[idx].start_pc;
1162   }
1163 
1164   void set_start_pc(int idx, u2 value) {
1165     assert(idx < _length, "out of bounds");
1166     _table[idx].start_pc = value;
1167   }
1168 
1169   u2 end_pc(int idx) const {
1170     assert(idx < _length, "out of bounds");
1171     return _table[idx].end_pc;
1172   }
1173 
1174   void set_end_pc(int idx, u2 value) {
1175     assert(idx < _length, "out of bounds");
1176     _table[idx].end_pc = value;
1177   }
1178 
1179   u2 handler_pc(int idx) const {
1180     assert(idx < _length, "out of bounds");
1181     return _table[idx].handler_pc;
1182   }
1183 
1184   void set_handler_pc(int idx, u2 value) {
1185     assert(idx < _length, "out of bounds");
1186     _table[idx].handler_pc = value;
1187   }
1188 
1189   u2 catch_type_index(int idx) const {
1190     assert(idx < _length, "out of bounds");
1191     return _table[idx].catch_type_index;
1192   }
1193 
1194   void set_catch_type_index(int idx, u2 value) {
1195     assert(idx < _length, "out of bounds");
1196     _table[idx].catch_type_index = value;
1197   }
1198 };
1199 
1200 #endif // SHARE_VM_OOPS_METHODOOP_HPP