1 /*
   2  * Copyright (c) 1997, 2022, 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_OOPS_METHOD_HPP
  26 #define SHARE_OOPS_METHOD_HPP
  27 
  28 #include "code/compressedStream.hpp"
  29 #include "compiler/compilerDefinitions.hpp"
  30 #include "interpreter/invocationCounter.hpp"
  31 #include "oops/annotations.hpp"
  32 #include "oops/constantPool.hpp"
  33 #include "oops/methodCounters.hpp"
  34 #include "oops/instanceKlass.hpp"
  35 #include "oops/oop.hpp"
  36 #include "oops/typeArrayOop.hpp"
  37 #include "utilities/accessFlags.hpp"
  38 #include "utilities/align.hpp"
  39 #include "utilities/growableArray.hpp"
  40 #include "utilities/macros.hpp"
  41 #include "utilities/vmEnums.hpp"
  42 #if INCLUDE_JFR
  43 #include "jfr/support/jfrTraceIdExtension.hpp"
  44 #endif
  45 
  46 
  47 // A Method represents a Java method.
  48 //
  49 // Note that most applications load thousands of methods, so keeping the size of this
  50 // class small has a big impact on footprint.
  51 //
  52 // Note that native_function and signature_handler have to be at fixed offsets
  53 // (required by the interpreter)
  54 //
  55 //  Method embedded field layout (after declared fields):
  56 //   [EMBEDDED native_function       (present only if native) ]
  57 //   [EMBEDDED signature_handler     (present only if native) ]
  58 
  59 class CheckedExceptionElement;
  60 class LocalVariableTableElement;
  61 class AdapterHandlerEntry;
  62 class MethodData;
  63 class MethodCounters;
  64 class ConstMethod;
  65 class InlineTableSizes;
  66 class CompiledMethod;
  67 class InterpreterOopMap;
  68 
  69 class Method : public Metadata {
  70  friend class VMStructs;
  71  friend class JVMCIVMStructs;
  72  friend class MethodTest;
  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   AdapterHandlerEntry* _adapter;
  80   AccessFlags       _access_flags;               // Access flags
  81   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  82                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  83   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  84 
  85   // Flags
  86   enum Flags {
  87     _caller_sensitive      = 1 << 0,
  88     _force_inline          = 1 << 1,
  89     _dont_inline           = 1 << 2,
  90     _hidden                = 1 << 3,
  91     _has_injected_profile  = 1 << 4,
  92     _intrinsic_candidate   = 1 << 5,
  93     _reserved_stack_access = 1 << 6,
  94     _scalarized_args       = 1 << 7,
  95     _c1_needs_stack_repair = 1 << 8,
  96     _c2_needs_stack_repair = 1 << 9,
  97     _scoped                = 1 << 10
  98   };
  99   mutable u2 _flags;
 100 
 101   JFR_ONLY(DEFINE_TRACE_FLAG;)
 102 
 103 #ifndef PRODUCT
 104   int64_t _compiled_invocation_count;
 105 
 106   Symbol* _name;
 107 #endif
 108   // Entry point for calling both from and to the interpreter.
 109   address _i2i_entry;           // All-args-on-stack calling convention
 110   // Entry point for calling from compiled code, to compiled code if it exists
 111   // or else the interpreter.
 112   volatile address _from_compiled_entry;           // Cache of: _code ? _code->verified_entry_point()           : _adapter->c2i_entry()
 113   volatile address _from_compiled_inline_ro_entry; // Cache of: _code ? _code->verified_inline_ro_entry_point() : _adapter->c2i_inline_ro_entry()
 114   volatile address _from_compiled_inline_entry;    // Cache of: _code ? _code->verified_inline_entry_point()    : _adapter->c2i_inline_entry()
 115   // The entry point for calling both from and to compiled code is
 116   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 117   // field can come and go.  It can transition from NULL to not-null at any
 118   // time (whenever a compile completes).  It can transition from not-null to
 119   // NULL only at safepoints (because of a de-opt).
 120   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 121   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 122 
 123   // Constructor
 124   Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name);
 125  public:
 126 
 127   static Method* allocate(ClassLoaderData* loader_data,
 128                           int byte_code_size,
 129                           AccessFlags access_flags,
 130                           InlineTableSizes* sizes,
 131                           ConstMethod::MethodType method_type,
 132                           Symbol* name,
 133                           TRAPS);
 134 
 135   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 136   Method(){}
 137 
 138   virtual bool is_method() const { return true; }
 139 
 140   void restore_unshareable_info(TRAPS);
 141 
 142   // accessors for instance variables
 143 
 144   ConstMethod* constMethod() const             { return _constMethod; }
 145   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 146 
 147 
 148   static address make_adapters(const methodHandle& mh, TRAPS);
 149   address from_compiled_entry() const;
 150   address from_compiled_inline_ro_entry() const;
 151   address from_compiled_inline_entry() const;
 152   address from_compiled_entry_no_trampoline(bool caller_is_c1) const;
 153   address from_interpreted_entry() const;
 154 
 155   // access flag
 156   AccessFlags access_flags() const               { return _access_flags;  }
 157   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 158 
 159   // name
 160   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 161   int name_index() const                         { return constMethod()->name_index();         }
 162   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 163 
 164   // signature
 165   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 166   int signature_index() const                    { return constMethod()->signature_index();         }
 167   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 168 
 169   // generics support
 170   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 171   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 172   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 173 
 174   // annotations support
 175   AnnotationArray* annotations() const           {
 176     return constMethod()->method_annotations();
 177   }
 178   AnnotationArray* parameter_annotations() const {
 179     return constMethod()->parameter_annotations();
 180   }
 181   AnnotationArray* annotation_default() const    {
 182     return constMethod()->default_annotations();
 183   }
 184   AnnotationArray* type_annotations() const      {
 185     return constMethod()->type_annotations();
 186   }
 187 
 188   // Helper routine: get klass name + "." + method name + signature as
 189   // C string, for the purpose of providing more useful
 190   // fatal error handling. The string is allocated in resource
 191   // area if a buffer is not provided by the caller.
 192   char* name_and_sig_as_C_string() const;
 193   char* name_and_sig_as_C_string(char* buf, int size) const;
 194 
 195   // Static routine in the situations we don't have a Method*
 196   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 197   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 198 
 199   // Get return type + klass name + "." + method name + ( parameters types )
 200   // as a C string or print it to an outputStream.
 201   // This is to be used to assemble strings passed to Java, so that
 202   // the text more resembles Java code. Used in exception messages.
 203   // Memory is allocated in the resource area; the caller needs
 204   // a ResourceMark.
 205   const char* external_name() const;
 206   void  print_external_name(outputStream *os) const;
 207 
 208   static const char* external_name(                  Klass* klass, Symbol* method_name, Symbol* signature);
 209   static void  print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
 210 
 211   Bytecodes::Code java_code_at(int bci) const {
 212     return Bytecodes::java_code_at(this, bcp_from(bci));
 213   }
 214   Bytecodes::Code code_at(int bci) const {
 215     return Bytecodes::code_at(this, bcp_from(bci));
 216   }
 217 
 218   // JVMTI breakpoints
 219 #if !INCLUDE_JVMTI
 220   Bytecodes::Code orig_bytecode_at(int bci) const {
 221     ShouldNotReachHere();
 222     return Bytecodes::_shouldnotreachhere;
 223   }
 224   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 225     ShouldNotReachHere();
 226   };
 227   u2   number_of_breakpoints() const {return 0;}
 228 #else // !INCLUDE_JVMTI
 229   Bytecodes::Code orig_bytecode_at(int bci) const;
 230   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 231   void set_breakpoint(int bci);
 232   void clear_breakpoint(int bci);
 233   void clear_all_breakpoints();
 234   // Tracking number of breakpoints, for fullspeed debugging.
 235   // Only mutated by VM thread.
 236   u2   number_of_breakpoints() const {
 237     MethodCounters* mcs = method_counters();
 238     if (mcs == NULL) {
 239       return 0;
 240     } else {
 241       return mcs->number_of_breakpoints();
 242     }
 243   }
 244   void incr_number_of_breakpoints(Thread* current) {
 245     MethodCounters* mcs = get_method_counters(current);
 246     if (mcs != NULL) {
 247       mcs->incr_number_of_breakpoints();
 248     }
 249   }
 250   void decr_number_of_breakpoints(Thread* current) {
 251     MethodCounters* mcs = get_method_counters(current);
 252     if (mcs != NULL) {
 253       mcs->decr_number_of_breakpoints();
 254     }
 255   }
 256   // Initialization only
 257   void clear_number_of_breakpoints() {
 258     MethodCounters* mcs = method_counters();
 259     if (mcs != NULL) {
 260       mcs->clear_number_of_breakpoints();
 261     }
 262   }
 263 #endif // !INCLUDE_JVMTI
 264 
 265   // index into InstanceKlass methods() array
 266   // note: also used by jfr
 267   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 268   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 269 
 270   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 271   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 272 
 273   // code size
 274   int code_size() const                  { return constMethod()->code_size(); }
 275 
 276   // method size in words
 277   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 278 
 279   // constant pool for Klass* holding this method
 280   ConstantPool* constants() const              { return constMethod()->constants(); }
 281   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 282 
 283   // max stack
 284   // return original max stack size for method verification
 285   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 286   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 287   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 288 
 289   // max locals
 290   int  max_locals() const                        { return constMethod()->max_locals(); }
 291   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 292 
 293   int highest_comp_level() const;
 294   void set_highest_comp_level(int level);
 295   int highest_osr_comp_level() const;
 296   void set_highest_osr_comp_level(int level);
 297 
 298 #if COMPILER2_OR_JVMCI
 299   // Count of times method was exited via exception while interpreting
 300   void interpreter_throwout_increment(Thread* current) {
 301     MethodCounters* mcs = get_method_counters(current);
 302     if (mcs != NULL) {
 303       mcs->interpreter_throwout_increment();
 304     }
 305   }
 306 #endif
 307 
 308   int  interpreter_throwout_count() const        {
 309     MethodCounters* mcs = method_counters();
 310     if (mcs == NULL) {
 311       return 0;
 312     } else {
 313       return mcs->interpreter_throwout_count();
 314     }
 315   }
 316 
 317   // Derive stuff from the signature at load time.
 318   void compute_from_signature(Symbol* sig);
 319 
 320   // size of parameters (receiver if any + arguments)
 321   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 322   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 323 
 324   bool has_stackmap_table() const {
 325     return constMethod()->has_stackmap_table();
 326   }
 327 
 328   Array<u1>* stackmap_data() const {
 329     return constMethod()->stackmap_data();
 330   }
 331 
 332   void set_stackmap_data(Array<u1>* sd) {
 333     constMethod()->set_stackmap_data(sd);
 334   }
 335 
 336   // exception handler table
 337   bool has_exception_handler() const
 338                              { return constMethod()->has_exception_handler(); }
 339   int exception_table_length() const
 340                              { return constMethod()->exception_table_length(); }
 341   ExceptionTableElement* exception_table_start() const
 342                              { return constMethod()->exception_table_start(); }
 343 
 344   // Finds the first entry point bci of an exception handler for an
 345   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 346   // for ex_klass indicates that the exception klass is not known; in
 347   // this case it matches any constraint class. Returns -1 if the
 348   // exception cannot be handled in this method. The handler
 349   // constraint classes are loaded if necessary. Note that this may
 350   // throw an exception if loading of the constraint classes causes
 351   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 352   // If an exception is thrown, returns the bci of the
 353   // exception handler which caused the exception to be thrown, which
 354   // is needed for proper retries. See, for example,
 355   // InterpreterRuntime::exception_handler_for_exception.
 356   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 357 
 358   static bool register_native(Klass* k,
 359                               Symbol* name,
 360                               Symbol* signature,
 361                               address entry,
 362                               TRAPS);
 363 
 364   // method data access
 365   MethodData* method_data() const              {
 366     return _method_data;
 367   }
 368 
 369   void set_method_data(MethodData* data);
 370 
 371   MethodCounters* method_counters() const {
 372     return _method_counters;
 373   }
 374 
 375   void clear_method_counters() {
 376     _method_counters = NULL;
 377   }
 378 
 379   bool init_method_counters(MethodCounters* counters);
 380 
 381   int prev_event_count() const {
 382     MethodCounters* mcs = method_counters();
 383     return mcs == NULL ? 0 : mcs->prev_event_count();
 384   }
 385   void set_prev_event_count(int count) {
 386     MethodCounters* mcs = method_counters();
 387     if (mcs != NULL) {
 388       mcs->set_prev_event_count(count);
 389     }
 390   }
 391   jlong prev_time() const {
 392     MethodCounters* mcs = method_counters();
 393     return mcs == NULL ? 0 : mcs->prev_time();
 394   }
 395   void set_prev_time(jlong time) {
 396     MethodCounters* mcs = method_counters();
 397     if (mcs != NULL) {
 398       mcs->set_prev_time(time);
 399     }
 400   }
 401   float rate() const {
 402     MethodCounters* mcs = method_counters();
 403     return mcs == NULL ? 0 : mcs->rate();
 404   }
 405   void set_rate(float rate) {
 406     MethodCounters* mcs = method_counters();
 407     if (mcs != NULL) {
 408       mcs->set_rate(rate);
 409     }
 410   }
 411 
 412   int nmethod_age() const {
 413     if (method_counters() == NULL) {
 414       return INT_MAX;
 415     } else {
 416       return method_counters()->nmethod_age();
 417     }
 418   }
 419 
 420   int invocation_count() const;
 421   int backedge_count() const;
 422 
 423   bool was_executed_more_than(int n);
 424   bool was_never_executed()                     { return !was_executed_more_than(0);  }
 425 
 426   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 427 
 428   static MethodCounters* build_method_counters(Thread* current, Method* m);
 429 
 430   int interpreter_invocation_count()            { return invocation_count();          }
 431 
 432 #ifndef PRODUCT
 433   int64_t  compiled_invocation_count() const    { return _compiled_invocation_count;}
 434   void set_compiled_invocation_count(int count) { _compiled_invocation_count = (int64_t)count; }
 435 #else
 436   // for PrintMethodData in a product build
 437   int64_t  compiled_invocation_count() const    { return 0; }
 438 #endif // not PRODUCT
 439 
 440   // Clear (non-shared space) pointers which could not be relevant
 441   // if this (shared) method were mapped into another JVM.
 442   void remove_unshareable_info();
 443 
 444   // nmethod/verified compiler entry
 445   address verified_code_entry();
 446   address verified_inline_code_entry();
 447   address verified_inline_ro_code_entry();
 448   bool check_code() const;      // Not inline to avoid circular ref
 449   CompiledMethod* volatile code() const;
 450 
 451   // Locks CompiledMethod_lock if not held.
 452   void unlink_code(CompiledMethod *compare);
 453   // Locks CompiledMethod_lock if not held.
 454   void unlink_code();
 455 
 456 private:
 457   // Either called with CompiledMethod_lock held or from constructor.
 458   void clear_code();
 459 
 460 public:
 461   static void set_code(const methodHandle& mh, CompiledMethod* code);
 462   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 463     _adapter = adapter;
 464   }
 465   void set_from_compiled_entry(address entry) {
 466     _from_compiled_entry = entry;
 467   }
 468   void set_from_compiled_inline_ro_entry(address entry) {
 469     _from_compiled_inline_ro_entry = entry;
 470   }
 471   void set_from_compiled_inline_entry(address entry) {
 472     _from_compiled_inline_entry = entry;
 473   }
 474 
 475   address get_i2c_entry();
 476   address get_c2i_entry();
 477   address get_c2i_inline_entry();
 478   address get_c2i_unverified_entry();
 479   address get_c2i_unverified_inline_entry();
 480   address get_c2i_no_clinit_check_entry();
 481   AdapterHandlerEntry* adapter() const {
 482     return _adapter;
 483   }
 484   // setup entry points
 485   void link_method(const methodHandle& method, TRAPS);
 486   // clear entry points. Used by sharing code during dump time
 487   void unlink_method() NOT_CDS_RETURN;
 488 
 489   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 490   virtual MetaspaceObj::Type type() const { return MethodType; }
 491 
 492   // vtable index
 493   enum VtableIndexFlag {
 494     // Valid vtable indexes are non-negative (>= 0).
 495     // These few negative values are used as sentinels.
 496     itable_index_max        = -10, // first itable index, growing downward
 497     pending_itable_index    = -9,  // itable index will be assigned
 498     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 499     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 500     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 501     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 502   };
 503   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 504   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 505   int  vtable_index() const                      { return _vtable_index; }
 506   void set_vtable_index(int index);
 507   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 508   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 509   int  itable_index() const                      { assert(valid_itable_index(), "");
 510                                                    return itable_index_max - _vtable_index; }
 511   void set_itable_index(int index);
 512 
 513   // interpreter entry
 514   address interpreter_entry() const              { return _i2i_entry; }
 515   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 516   void set_interpreter_entry(address entry) {
 517     if (_i2i_entry != entry) {
 518       _i2i_entry = entry;
 519     }
 520     if (_from_interpreted_entry != entry) {
 521       _from_interpreted_entry = entry;
 522     }
 523   }
 524 
 525   // native function (used for native methods only)
 526   enum {
 527     native_bind_event_is_interesting = true
 528   };
 529   address native_function() const                { return *(native_function_addr()); }
 530 
 531   // Must specify a real function (not NULL).
 532   // Use clear_native_function() to unregister.
 533   void set_native_function(address function, bool post_event_flag);
 534   bool has_native_function() const;
 535   void clear_native_function();
 536 
 537   // signature handler (used for native methods only)
 538   address signature_handler() const              { return *(signature_handler_addr()); }
 539   void set_signature_handler(address handler);
 540 
 541   // Interpreter oopmap support
 542   void mask_for(int bci, InterpreterOopMap* mask);
 543 
 544   // operations on invocation counter
 545   void print_invocation_count();
 546 
 547   // byte codes
 548   void    set_code(address code)      { return constMethod()->set_code(code); }
 549   address code_base() const           { return constMethod()->code_base(); }
 550   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 551 
 552   // prints byte codes
 553   void print_codes() const            { print_codes_on(tty); }
 554   void print_codes_on(outputStream* st) const;
 555   void print_codes_on(int from, int to, outputStream* st) const;
 556 
 557   // method parameters
 558   bool has_method_parameters() const
 559                          { return constMethod()->has_method_parameters(); }
 560   int method_parameters_length() const
 561                          { return constMethod()->method_parameters_length(); }
 562   MethodParametersElement* method_parameters_start() const
 563                           { return constMethod()->method_parameters_start(); }
 564 
 565   // checked exceptions
 566   int checked_exceptions_length() const
 567                          { return constMethod()->checked_exceptions_length(); }
 568   CheckedExceptionElement* checked_exceptions_start() const
 569                           { return constMethod()->checked_exceptions_start(); }
 570 
 571   // localvariable table
 572   bool has_localvariable_table() const
 573                           { return constMethod()->has_localvariable_table(); }
 574   int localvariable_table_length() const
 575                         { return constMethod()->localvariable_table_length(); }
 576   LocalVariableTableElement* localvariable_table_start() const
 577                          { return constMethod()->localvariable_table_start(); }
 578 
 579   bool has_linenumber_table() const
 580                               { return constMethod()->has_linenumber_table(); }
 581   u_char* compressed_linenumber_table() const
 582                        { return constMethod()->compressed_linenumber_table(); }
 583 
 584   // method holder (the Klass* holding this method)
 585   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 586 
 587   Symbol* klass_name() const;                    // returns the name of the method holder
 588   BasicType result_type() const                  { return constMethod()->result_type(); }
 589   bool is_returning_oop() const                  { BasicType r = result_type(); return is_reference_type(r); }
 590   InlineKlass* returns_inline_type(Thread* thread) const;
 591 
 592   // Checked exceptions thrown by this method (resolved to mirrors)
 593   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 594 
 595   // Access flags
 596   bool is_public() const                         { return access_flags().is_public();      }
 597   bool is_private() const                        { return access_flags().is_private();     }
 598   bool is_protected() const                      { return access_flags().is_protected();   }
 599   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 600   bool is_static() const                         { return access_flags().is_static();      }
 601   bool is_final() const                          { return access_flags().is_final();       }
 602   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 603   bool is_native() const                         { return access_flags().is_native();      }
 604   bool is_abstract() const                       { return access_flags().is_abstract();    }
 605   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 606 
 607   // returns true if contains only return operation
 608   bool is_empty_method() const;
 609 
 610   // returns true if this is a vanilla constructor
 611   bool is_vanilla_constructor() const;
 612 
 613   // checks method and its method holder
 614   bool is_final_method() const;
 615   bool is_final_method(AccessFlags class_access_flags) const;
 616   // interface method declared with 'default' - excludes private interface methods
 617   bool is_default_method() const;
 618 
 619   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 620   bool can_be_statically_bound() const;
 621   bool can_be_statically_bound(InstanceKlass* context) const;
 622   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 623 
 624   // true if method can omit stack trace in throw in compiled code.
 625   bool can_omit_stack_trace();
 626 
 627   // returns true if the method has any backward branches.
 628   bool has_loops() {
 629     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 630   };
 631 
 632   bool compute_has_loops_flag();
 633 
 634   bool has_jsrs() {
 635     return access_flags().has_jsrs();
 636   };
 637   void set_has_jsrs() {
 638     _access_flags.set_has_jsrs();
 639   }
 640 
 641   // returns true if the method has any monitors.
 642   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 643   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 644 
 645   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 646 
 647   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 648   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 649   // has not been computed yet.
 650   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 651   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 652 
 653   // returns true if the method is an accessor function (setter/getter).
 654   bool is_accessor() const;
 655 
 656   // returns true if the method is a getter
 657   bool is_getter() const;
 658 
 659   // returns true if the method is a setter
 660   bool is_setter() const;
 661 
 662   // returns true if the method does nothing but return a constant of primitive type
 663   bool is_constant_getter() const;
 664 
 665   // returns true if the method name is <clinit> and the method has
 666   // valid static initializer flags.
 667   bool is_class_initializer() const;
 668 
 669   // returns true if the method name is <init> and the method is not a static factory
 670   bool is_object_constructor() const;
 671 
 672   // returns true if the method is an object constructor or class initializer
 673   // (non-static <init> or <clinit>), but false for factories (static <init>).
 674   bool is_object_constructor_or_class_initializer() const;
 675 
 676   // returns true if the method name is <init> and the method is static
 677   bool is_static_init_factory() const;
 678 
 679   // compiled code support
 680   // NOTE: code() is inherently racy as deopt can be clearing code
 681   // simultaneously. Use with caution.
 682   bool has_compiled_code() const;
 683 
 684   bool needs_clinit_barrier() const;
 685 
 686   // sizing
 687   static int header_size()                       {
 688     return align_up((int)sizeof(Method), wordSize) / wordSize;
 689   }
 690   static int size(bool is_native);
 691   int size() const                               { return method_size(); }
 692   void log_touched(Thread* current);
 693   static void print_touched_methods(outputStream* out);
 694 
 695   // interpreter support
 696   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 697   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 698   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 699   static ByteSize from_compiled_inline_offset()  { return byte_offset_of(Method, _from_compiled_inline_entry); }
 700   static ByteSize from_compiled_inline_ro_offset(){ return byte_offset_of(Method, _from_compiled_inline_ro_entry); }
 701   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 702   static ByteSize flags_offset()                 { return byte_offset_of(Method, _flags); }
 703   static ByteSize method_data_offset()           {
 704     return byte_offset_of(Method, _method_data);
 705   }
 706   static ByteSize method_counters_offset()       {
 707     return byte_offset_of(Method, _method_counters);
 708   }
 709 #ifndef PRODUCT
 710   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 711 #endif // not PRODUCT
 712   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 713   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 714   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 715   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 716   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 717 
 718   // for code generation
 719   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 720   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 721   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 722 
 723   // Static methods that are used to implement member methods where an exposed this pointer
 724   // is needed due to possible GCs
 725   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 726 
 727   // Returns the byte code index from the byte code pointer
 728   int     bci_from(address bcp) const;
 729   address bcp_from(int bci) const;
 730   address bcp_from(address bcp) const;
 731   int validate_bci_from_bcp(address bcp) const;
 732   int validate_bci(int bci) const;
 733 
 734   // Returns the line number for a bci if debugging information for the method is prowided,
 735   // -1 is returned otherwise.
 736   int line_number_from_bci(int bci) const;
 737 
 738   // Reflection support
 739   bool is_overridden_in(Klass* k) const;
 740 
 741   // Stack walking support
 742   bool is_ignored_by_security_stack_walk() const;
 743 
 744   // JSR 292 support
 745   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 746   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 747   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 748   static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
 749                                                    Symbol* signature, //anything at all
 750                                                    TRAPS);
 751   static Klass* check_non_bcp_klass(Klass* klass);
 752 
 753   enum {
 754     // How many extra stack entries for invokedynamic
 755     extra_stack_entries_for_jsr292 = 1
 756   };
 757 
 758   // this operates only on invoke methods:
 759   // presize interpreter frames for extra interpreter stack entries, if needed
 760   // Account for the extra appendix argument for invokehandle/invokedynamic
 761   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 762   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 763 
 764   // RedefineClasses() support:
 765   bool is_old() const                               { return access_flags().is_old(); }
 766   void set_is_old()                                 { _access_flags.set_is_old(); }
 767   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 768   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 769   bool is_deleted() const                           { return access_flags().is_deleted(); }
 770   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 771 
 772   bool on_stack() const                             { return access_flags().on_stack(); }
 773   void set_on_stack(const bool value);
 774 
 775   // see the definition in Method*.cpp for the gory details
 776   bool should_not_be_cached() const;
 777 
 778   // JVMTI Native method prefixing support:
 779   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 780   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 781 
 782   // Rewriting support
 783   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 784                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 785 
 786   // jmethodID handling
 787   // Because the useful life-span of a jmethodID cannot be determined,
 788   // once created they are never reclaimed.  The methods to which they refer,
 789   // however, can be GC'ed away if the class is unloaded or if the method is
 790   // made obsolete or deleted -- in these cases, the jmethodID
 791   // refers to NULL (as is the case for any weak reference).
 792   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 793   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 794 
 795   // Ensure there is enough capacity in the internal tracking data
 796   // structures to hold the number of jmethodIDs you plan to generate.
 797   // This saves substantial time doing allocations.
 798   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 799 
 800   // Use resolve_jmethod_id() in situations where the caller is expected
 801   // to provide a valid jmethodID; the only sanity checks are in asserts;
 802   // result guaranteed not to be NULL.
 803   inline static Method* resolve_jmethod_id(jmethodID mid) {
 804     assert(mid != NULL, "JNI method id should not be null");
 805     return *((Method**)mid);
 806   }
 807 
 808   // Use checked_resolve_jmethod_id() in situations where the caller
 809   // should provide a valid jmethodID, but might not. NULL is returned
 810   // when the jmethodID does not refer to a valid method.
 811   static Method* checked_resolve_jmethod_id(jmethodID mid);
 812 
 813   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 814   static bool is_method_id(jmethodID mid);
 815 
 816   // Clear methods
 817   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 818   static void print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 819 
 820   // Get this method's jmethodID -- allocate if it doesn't exist
 821   jmethodID jmethod_id();
 822 
 823   // Lookup the jmethodID for this method.  Return NULL if not found.
 824   // NOTE that this function can be called from a signal handler
 825   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 826   // needs to be async-safe. No allocation should be done and
 827   // so handles are not used to avoid deadlock.
 828   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 829 
 830   // Support for inlining of intrinsic methods
 831   vmIntrinsicID intrinsic_id() const          { return (vmIntrinsicID) _intrinsic_id;           }
 832   void     set_intrinsic_id(vmIntrinsicID id) {                           _intrinsic_id = (u2) id; }
 833 
 834   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 835   void init_intrinsic_id(vmSymbolID klass_id);     // updates from _none if a match
 836   static vmSymbolID klass_id_for_intrinsics(const Klass* holder);
 837 
 838   bool caller_sensitive() {
 839     return (_flags & _caller_sensitive) != 0;
 840   }
 841   void set_caller_sensitive(bool x) {
 842     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 843   }
 844 
 845   bool force_inline() {
 846     return (_flags & _force_inline) != 0;
 847   }
 848   void set_force_inline(bool x) {
 849     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 850   }
 851 
 852   bool dont_inline() {
 853     return (_flags & _dont_inline) != 0;
 854   }
 855   void set_dont_inline(bool x) {
 856     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 857   }
 858 
 859   bool is_hidden() const {
 860     return (_flags & _hidden) != 0;
 861   }
 862 
 863   void set_hidden(bool x) {
 864     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 865   }
 866 
 867   bool is_scoped() const {
 868     return (_flags & _scoped) != 0;
 869   }
 870 
 871   void set_scoped(bool x) {
 872     _flags = x ? (_flags | _scoped) : (_flags & ~_scoped);
 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   bool has_scalarized_args() const {
 898     return (_flags & _scalarized_args) != 0;
 899   }
 900 
 901   void set_has_scalarized_args(bool x) {
 902     _flags = x ? (_flags | _scalarized_args) : (_flags & ~_scalarized_args);
 903   }
 904 
 905   bool is_scalarized_arg(int idx) const;
 906 
 907   bool c1_needs_stack_repair() {
 908     return (_flags & _c1_needs_stack_repair) != 0;
 909   }
 910 
 911   bool c2_needs_stack_repair() {
 912     return (_flags & _c2_needs_stack_repair) != 0;
 913   }
 914 
 915   void set_c1_needs_stack_repair(bool x) {
 916     _flags = x ? (_flags | _c1_needs_stack_repair) : (_flags & ~_c1_needs_stack_repair);
 917   }
 918 
 919   void set_c2_needs_stack_repair(bool x) {
 920     _flags = x ? (_flags | _c2_needs_stack_repair) : (_flags & ~_c2_needs_stack_repair);
 921   }
 922 
 923   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 924 
 925   ConstMethod::MethodType method_type() const {
 926       return _constMethod->method_type();
 927   }
 928   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 929 
 930   // On-stack replacement support
 931   bool has_osr_nmethod(int level, bool match_level) {
 932    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 933   }
 934 
 935   int mark_osr_nmethods() {
 936     return method_holder()->mark_osr_nmethods(this);
 937   }
 938 
 939   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 940     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 941   }
 942 
 943   // Find if klass for method is loaded
 944   bool is_klass_loaded_by_klass_index(int klass_index) const;
 945   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 946 
 947   // Indicates whether compilation failed earlier for this method, or
 948   // whether it is not compilable for another reason like having a
 949   // breakpoint set in it.
 950   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 951   void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 952   void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 953     set_not_compilable(reason, comp_level, false);
 954   }
 955   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 956   void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 957   void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 958     set_not_osr_compilable(reason, comp_level, false);
 959   }
 960   bool is_always_compilable() const;
 961 
 962  private:
 963   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 964 
 965  public:
 966   MethodCounters* get_method_counters(Thread* current) {
 967     if (_method_counters == NULL) {
 968       build_method_counters(current, this);
 969     }
 970     return _method_counters;
 971   }
 972 
 973   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 974   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 975   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 976   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 977   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 978   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 979 
 980   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 981   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 982   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 983   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 984   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 985   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 986 
 987   // Background compilation support
 988   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 989   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 990   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 991 
 992   // Resolve all classes in signature, return 'true' if successful
 993   static bool load_signature_classes(const methodHandle& m, TRAPS);
 994 
 995   // Return if true if not all classes references in signature, including return type, has been loaded
 996   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 997 
 998   // Printing
 999   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
1000 #if INCLUDE_JVMTI
1001   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
1002 #else
1003   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
1004 #endif
1005 
1006   typedef int (*method_comparator_func)(Method* a, Method* b);
1007 
1008   // Helper routine used for method sorting
1009   static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = NULL);
1010 
1011   // Deallocation function for redefine classes or if an error occurs
1012   void deallocate_contents(ClassLoaderData* loader_data);
1013 
1014   void release_C_heap_structures();
1015 
1016   Method* get_new_method() const {
1017     InstanceKlass* holder = method_holder();
1018     Method* new_method = holder->method_with_idnum(orig_method_idnum());
1019 
1020     assert(new_method != NULL, "method_with_idnum() should not be NULL");
1021     assert(this != new_method, "sanity check");
1022     return new_method;
1023   }
1024 
1025   // Printing
1026 #ifndef PRODUCT
1027   void print_on(outputStream* st) const;
1028 #endif
1029   void print_value_on(outputStream* st) const;
1030   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1031 
1032   const char* internal_name() const { return "{method}"; }
1033 
1034   // Check for valid method pointer
1035   static bool has_method_vptr(const void* ptr);
1036   static bool is_valid_method(const Method* m);
1037 
1038   // Verify
1039   void verify() { verify_on(tty); }
1040   void verify_on(outputStream* st);
1041 
1042  private:
1043 
1044   // Inlined elements
1045   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1046   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1047 };
1048 
1049 
1050 // Utility class for compressing line number tables
1051 
1052 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1053  private:
1054   int _bci;
1055   int _line;
1056  public:
1057   // Constructor
1058   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1059   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1060 
1061   // Write (bci, line number) pair to stream
1062   void write_pair_regular(int bci_delta, int line_delta);
1063 
1064   // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1065   // we save it as one byte, otherwise we write a 0xFF escape character
1066   // and use regular compression. 0x0 is used as end-of-stream terminator.
1067   void write_pair_inline(int bci, int line);
1068 
1069   void write_pair(int bci, int line);
1070 
1071   // Write end-of-stream marker
1072   void write_terminator()                        { write_byte(0); }
1073 };
1074 
1075 
1076 // Utility class for decompressing line number tables
1077 
1078 class CompressedLineNumberReadStream: public CompressedReadStream {
1079  private:
1080   int _bci;
1081   int _line;
1082  public:
1083   // Constructor
1084   CompressedLineNumberReadStream(u_char* buffer);
1085   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1086   bool read_pair();
1087   // Accessing bci and line number (after calling read_pair)
1088   int bci() const                               { return _bci; }
1089   int line() const                              { return _line; }
1090 };
1091 
1092 
1093 #if INCLUDE_JVMTI
1094 
1095 /// Fast Breakpoints.
1096 
1097 // If this structure gets more complicated (because bpts get numerous),
1098 // move it into its own header.
1099 
1100 // There is presently no provision for concurrent access
1101 // to breakpoint lists, which is only OK for JVMTI because
1102 // breakpoints are written only at safepoints, and are read
1103 // concurrently only outside of safepoints.
1104 
1105 class BreakpointInfo : public CHeapObj<mtClass> {
1106   friend class VMStructs;
1107  private:
1108   Bytecodes::Code  _orig_bytecode;
1109   int              _bci;
1110   u2               _name_index;       // of method
1111   u2               _signature_index;  // of method
1112   BreakpointInfo*  _next;             // simple storage allocation
1113 
1114  public:
1115   BreakpointInfo(Method* m, int bci);
1116 
1117   // accessors
1118   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1119   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1120   int         bci()                                   { return _bci; }
1121 
1122   BreakpointInfo*          next() const               { return _next; }
1123   void                 set_next(BreakpointInfo* n)    { _next = n; }
1124 
1125   // helps for searchers
1126   bool match(const Method* m, int bci) {
1127     return bci == _bci && match(m);
1128   }
1129 
1130   bool match(const Method* m) {
1131     return _name_index == m->name_index() &&
1132       _signature_index == m->signature_index();
1133   }
1134 
1135   void set(Method* method);
1136   void clear(Method* method);
1137 };
1138 
1139 #endif // INCLUDE_JVMTI
1140 
1141 // Utility class for access exception handlers
1142 class ExceptionTable : public StackObj {
1143  private:
1144   ExceptionTableElement* _table;
1145   u2  _length;
1146 
1147  public:
1148   ExceptionTable(const Method* m) {
1149     if (m->has_exception_handler()) {
1150       _table = m->exception_table_start();
1151       _length = m->exception_table_length();
1152     } else {
1153       _table = NULL;
1154       _length = 0;
1155     }
1156   }
1157 
1158   int length() const {
1159     return _length;
1160   }
1161 
1162   u2 start_pc(int idx) const {
1163     assert(idx < _length, "out of bounds");
1164     return _table[idx].start_pc;
1165   }
1166 
1167   void set_start_pc(int idx, u2 value) {
1168     assert(idx < _length, "out of bounds");
1169     _table[idx].start_pc = value;
1170   }
1171 
1172   u2 end_pc(int idx) const {
1173     assert(idx < _length, "out of bounds");
1174     return _table[idx].end_pc;
1175   }
1176 
1177   void set_end_pc(int idx, u2 value) {
1178     assert(idx < _length, "out of bounds");
1179     _table[idx].end_pc = value;
1180   }
1181 
1182   u2 handler_pc(int idx) const {
1183     assert(idx < _length, "out of bounds");
1184     return _table[idx].handler_pc;
1185   }
1186 
1187   void set_handler_pc(int idx, u2 value) {
1188     assert(idx < _length, "out of bounds");
1189     _table[idx].handler_pc = value;
1190   }
1191 
1192   u2 catch_type_index(int idx) const {
1193     assert(idx < _length, "out of bounds");
1194     return _table[idx].catch_type_index;
1195   }
1196 
1197   void set_catch_type_index(int idx, u2 value) {
1198     assert(idx < _length, "out of bounds");
1199     _table[idx].catch_type_index = value;
1200   }
1201 };
1202 
1203 #endif // SHARE_OOPS_METHOD_HPP