1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #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/growableArray.hpp"
  41 
  42 // A Method represents a Java method.
  43 //
  44 // Note that most applications load thousands of methods, so keeping the size of this
  45 // class small has a big impact on footprint.
  46 //
  47 // Note that native_function and signature_handler have to be at fixed offsets
  48 // (required by the interpreter)
  49 //
  50 //  Method embedded field layout (after declared fields):
  51 //   [EMBEDDED native_function       (present only if native) ]
  52 //   [EMBEDDED signature_handler     (present only if native) ]
  53 
  54 class CheckedExceptionElement;
  55 class LocalVariableTableElement;
  56 class AdapterHandlerEntry;
  57 class MethodData;
  58 class MethodCounters;
  59 class ConstMethod;
  60 class InlineTableSizes;
  61 class KlassSizeStats;
  62 class CompiledMethod;
  63 
  64 class Method : public Metadata {
  65  friend class VMStructs;
  66  friend class JVMCIVMStructs;
  67  private:
  68   ConstMethod*      _constMethod;                // Method read-only data.
  69   MethodData*       _method_data;
  70   MethodCounters*   _method_counters;
  71   AccessFlags       _access_flags;               // Access flags
  72   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  73                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  74   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  75 
  76   // Flags
  77   enum Flags {
  78     _caller_sensitive      = 1 << 0,
  79     _force_inline          = 1 << 1,
  80     _dont_inline           = 1 << 2,
  81     _hidden                = 1 << 3,
  82     _has_injected_profile  = 1 << 4,
  83     _running_emcp          = 1 << 5,
  84     _intrinsic_candidate   = 1 << 6,
  85     _reserved_stack_access = 1 << 7
  86   };
  87   mutable u2 _flags;
  88 
  89   TRACE_DEFINE_FLAG;
  90 
  91 #ifndef PRODUCT
  92   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
  93 #endif
  94   // Entry point for calling both from and to the interpreter.
  95   address _i2i_entry;           // All-args-on-stack calling convention
  96   // Entry point for calling from compiled code, to compiled code if it exists
  97   // or else the interpreter.
  98   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
  99   // The entry point for calling both from and to compiled code is
 100   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 101   // field can come and go.  It can transition from NULL to not-null at any
 102   // time (whenever a compile completes).  It can transition from not-null to
 103   // NULL only at safepoints (because of a de-opt).
 104   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 105   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 106   int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
 107 
 108 #if INCLUDE_AOT && defined(TIERED)
 109   CompiledMethod* _aot_code;
 110 #endif
 111 
 112   // Constructor
 113   Method(ConstMethod* xconst, AccessFlags access_flags);
 114  public:
 115 
 116   static Method* allocate(ClassLoaderData* loader_data,
 117                           int byte_code_size,
 118                           AccessFlags access_flags,
 119                           InlineTableSizes* sizes,
 120                           ConstMethod::MethodType method_type,
 121                           TRAPS);
 122 
 123   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 124   Method(){}
 125 
 126   bool is_method() const volatile { return true; }
 127 
 128   void restore_unshareable_info(TRAPS);
 129 
 130   // accessors for instance variables
 131 
 132   ConstMethod* constMethod() const             { return _constMethod; }
 133   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 134 
 135 
 136   static address make_adapters(methodHandle mh, TRAPS);
 137   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 138   volatile address from_compiled_entry_no_trampoline() const;
 139   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 140 
 141   // access flag
 142   AccessFlags access_flags() const               { return _access_flags;  }
 143   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 144 
 145   // name
 146   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 147   int name_index() const                         { return constMethod()->name_index();         }
 148   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 149 
 150   // signature
 151   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 152   int signature_index() const                    { return constMethod()->signature_index();         }
 153   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 154 
 155   // generics support
 156   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 157   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 158   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 159 
 160   // annotations support
 161   AnnotationArray* annotations() const           {
 162     return constMethod()->method_annotations();
 163   }
 164   AnnotationArray* parameter_annotations() const {
 165     return constMethod()->parameter_annotations();
 166   }
 167   AnnotationArray* annotation_default() const    {
 168     return constMethod()->default_annotations();
 169   }
 170   AnnotationArray* type_annotations() const      {
 171     return constMethod()->type_annotations();
 172   }
 173 
 174   // Helper routine: get klass name + "." + method name + signature as
 175   // C string, for the purpose of providing more useful NoSuchMethodErrors
 176   // and fatal error handling. The string is allocated in resource
 177   // area if a buffer is not provided by the caller.
 178   char* name_and_sig_as_C_string() const;
 179   char* name_and_sig_as_C_string(char* buf, int size) const;
 180 
 181   // Static routine in the situations we don't have a Method*
 182   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 183   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 184 
 185   Bytecodes::Code java_code_at(int bci) const {
 186     return Bytecodes::java_code_at(this, bcp_from(bci));
 187   }
 188   Bytecodes::Code code_at(int bci) const {
 189     return Bytecodes::code_at(this, bcp_from(bci));
 190   }
 191 
 192   // JVMTI breakpoints
 193 #if !INCLUDE_JVMTI
 194   Bytecodes::Code orig_bytecode_at(int bci) const {
 195     ShouldNotReachHere();
 196     return Bytecodes::_shouldnotreachhere;
 197   }
 198   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 199     ShouldNotReachHere();
 200   };
 201   u2   number_of_breakpoints() const {return 0;}
 202 #else // !INCLUDE_JVMTI
 203   Bytecodes::Code orig_bytecode_at(int bci) const;
 204   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 205   void set_breakpoint(int bci);
 206   void clear_breakpoint(int bci);
 207   void clear_all_breakpoints();
 208   // Tracking number of breakpoints, for fullspeed debugging.
 209   // Only mutated by VM thread.
 210   u2   number_of_breakpoints()             const {
 211     MethodCounters* mcs = method_counters();
 212     if (mcs == NULL) {
 213       return 0;
 214     } else {
 215       return mcs->number_of_breakpoints();
 216     }
 217   }
 218   void incr_number_of_breakpoints(TRAPS)         {
 219     MethodCounters* mcs = get_method_counters(CHECK);
 220     if (mcs != NULL) {
 221       mcs->incr_number_of_breakpoints();
 222     }
 223   }
 224   void decr_number_of_breakpoints(TRAPS)         {
 225     MethodCounters* mcs = get_method_counters(CHECK);
 226     if (mcs != NULL) {
 227       mcs->decr_number_of_breakpoints();
 228     }
 229   }
 230   // Initialization only
 231   void clear_number_of_breakpoints()             {
 232     MethodCounters* mcs = method_counters();
 233     if (mcs != NULL) {
 234       mcs->clear_number_of_breakpoints();
 235     }
 236   }
 237 #endif // !INCLUDE_JVMTI
 238 
 239   // index into InstanceKlass methods() array
 240   // note: also used by jfr
 241   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 242   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 243 
 244   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 245   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 246 
 247   // code size
 248   int code_size() const                  { return constMethod()->code_size(); }
 249 
 250   // method size in words
 251   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 252 
 253   // constant pool for Klass* holding this method
 254   ConstantPool* constants() const              { return constMethod()->constants(); }
 255   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 256 
 257   // max stack
 258   // return original max stack size for method verification
 259   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 260   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 261   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 262 
 263   // max locals
 264   int  max_locals() const                        { return constMethod()->max_locals(); }
 265   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 266 
 267   // value type buffering
 268   void initialize_max_vt_buffer();
 269   int max_vt_buffer() const                      { return _max_vt_buffer; }
 270   void set_max_vt_buffer(int size)               { _max_vt_buffer = size; }
 271 
 272 
 273   int highest_comp_level() const;
 274   void set_highest_comp_level(int level);
 275   int highest_osr_comp_level() const;
 276   void set_highest_osr_comp_level(int level);
 277 
 278 #if defined(COMPILER2) || INCLUDE_JVMCI
 279   // Count of times method was exited via exception while interpreting
 280   void interpreter_throwout_increment(TRAPS) {
 281     MethodCounters* mcs = get_method_counters(CHECK);
 282     if (mcs != NULL) {
 283       mcs->interpreter_throwout_increment();
 284     }
 285   }
 286 #endif
 287 
 288   int  interpreter_throwout_count() const        {
 289     MethodCounters* mcs = method_counters();
 290     if (mcs == NULL) {
 291       return 0;
 292     } else {
 293       return mcs->interpreter_throwout_count();
 294     }
 295   }
 296 
 297   // size of parameters
 298   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 299   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 300 
 301   bool has_stackmap_table() const {
 302     return constMethod()->has_stackmap_table();
 303   }
 304 
 305   Array<u1>* stackmap_data() const {
 306     return constMethod()->stackmap_data();
 307   }
 308 
 309   void set_stackmap_data(Array<u1>* sd) {
 310     constMethod()->set_stackmap_data(sd);
 311   }
 312 
 313   // exception handler table
 314   bool has_exception_handler() const
 315                              { return constMethod()->has_exception_handler(); }
 316   int exception_table_length() const
 317                              { return constMethod()->exception_table_length(); }
 318   ExceptionTableElement* exception_table_start() const
 319                              { return constMethod()->exception_table_start(); }
 320 
 321   // Finds the first entry point bci of an exception handler for an
 322   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 323   // for ex_klass indicates that the exception klass is not known; in
 324   // this case it matches any constraint class. Returns -1 if the
 325   // exception cannot be handled in this method. The handler
 326   // constraint classes are loaded if necessary. Note that this may
 327   // throw an exception if loading of the constraint classes causes
 328   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 329   // If an exception is thrown, returns the bci of the
 330   // exception handler which caused the exception to be thrown, which
 331   // is needed for proper retries. See, for example,
 332   // InterpreterRuntime::exception_handler_for_exception.
 333   static int fast_exception_handler_bci_for(methodHandle mh, Klass* ex_klass, int throw_bci, TRAPS);
 334 
 335   // method data access
 336   MethodData* method_data() const              {
 337     return _method_data;
 338   }
 339 
 340   void set_method_data(MethodData* data)       {
 341     // The store into method must be released. On platforms without
 342     // total store order (TSO) the reference may become visible before
 343     // the initialization of data otherwise.
 344     OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
 345   }
 346 
 347   MethodCounters* method_counters() const {
 348     return _method_counters;
 349   }
 350 
 351   void clear_method_counters() {
 352     _method_counters = NULL;
 353   }
 354 
 355   bool init_method_counters(MethodCounters* counters) {
 356     // Try to install a pointer to MethodCounters, return true on success.
 357     return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
 358   }
 359 
 360 #ifdef TIERED
 361   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 362   // We can do that since interpreter_invocation_count is not used in tiered.
 363   int prev_event_count() const                   {
 364     if (method_counters() == NULL) {
 365       return 0;
 366     } else {
 367       return method_counters()->interpreter_invocation_count();
 368     }
 369   }
 370   void set_prev_event_count(int count) {
 371     MethodCounters* mcs = method_counters();
 372     if (mcs != NULL) {
 373       mcs->set_interpreter_invocation_count(count);
 374     }
 375   }
 376   jlong prev_time() const                        {
 377     MethodCounters* mcs = method_counters();
 378     return mcs == NULL ? 0 : mcs->prev_time();
 379   }
 380   void set_prev_time(jlong time) {
 381     MethodCounters* mcs = method_counters();
 382     if (mcs != NULL) {
 383       mcs->set_prev_time(time);
 384     }
 385   }
 386   float rate() const                             {
 387     MethodCounters* mcs = method_counters();
 388     return mcs == NULL ? 0 : mcs->rate();
 389   }
 390   void set_rate(float rate) {
 391     MethodCounters* mcs = method_counters();
 392     if (mcs != NULL) {
 393       mcs->set_rate(rate);
 394     }
 395   }
 396 
 397 #if INCLUDE_AOT
 398   void set_aot_code(CompiledMethod* aot_code) {
 399     _aot_code = aot_code;
 400   }
 401 
 402   CompiledMethod* aot_code() const {
 403     return _aot_code;
 404   }
 405 #else
 406   CompiledMethod* aot_code() const { return NULL; }
 407 #endif // INCLUDE_AOT
 408 #endif // TIERED
 409 
 410   int nmethod_age() const {
 411     if (method_counters() == NULL) {
 412       return INT_MAX;
 413     } else {
 414       return method_counters()->nmethod_age();
 415     }
 416   }
 417 
 418   int invocation_count();
 419   int backedge_count();
 420 
 421   bool was_executed_more_than(int n);
 422   bool was_never_executed()                      { return !was_executed_more_than(0); }
 423 
 424   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 425 
 426   static MethodCounters* build_method_counters(Method* m, TRAPS);
 427 
 428   int interpreter_invocation_count() {
 429     if (TieredCompilation) {
 430       return invocation_count();
 431     } else {
 432       MethodCounters* mcs = method_counters();
 433       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 434     }
 435   }
 436 #if defined(COMPILER2) || INCLUDE_JVMCI
 437   int increment_interpreter_invocation_count(TRAPS) {
 438     if (TieredCompilation) ShouldNotReachHere();
 439     MethodCounters* mcs = get_method_counters(CHECK_0);
 440     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 441   }
 442 #endif
 443 
 444 #ifndef PRODUCT
 445   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 446   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 447 #else
 448   // for PrintMethodData in a product build
 449   int  compiled_invocation_count() const         { return 0;  }
 450 #endif // not PRODUCT
 451 
 452   // Clear (non-shared space) pointers which could not be relevant
 453   // if this (shared) method were mapped into another JVM.
 454   void remove_unshareable_info();
 455 
 456   // nmethod/verified compiler entry
 457   address verified_code_entry();
 458   bool check_code() const;      // Not inline to avoid circular ref
 459   CompiledMethod* volatile code() const                 { assert( check_code(), "" ); return (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); }
 460   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 461   static void set_code(methodHandle mh, CompiledMethod* code);
 462   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 463     constMethod()->set_adapter_entry(adapter);
 464   }
 465   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 466     constMethod()->update_adapter_trampoline(adapter);
 467   }
 468 
 469   address get_i2c_entry();
 470   address get_c2i_entry();
 471   address get_c2i_unverified_entry();
 472   AdapterHandlerEntry* adapter() const {
 473     return constMethod()->adapter();
 474   }
 475   // setup entry points
 476   void link_method(const methodHandle& method, TRAPS);
 477   // clear entry points. Used by sharing code during dump time
 478   void unlink_method() NOT_CDS_RETURN;
 479 
 480   // vtable index
 481   enum VtableIndexFlag {
 482     // Valid vtable indexes are non-negative (>= 0).
 483     // These few negative values are used as sentinels.
 484     itable_index_max        = -10, // first itable index, growing downward
 485     pending_itable_index    = -9,  // itable index will be assigned
 486     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 487     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 488     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 489     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 490   };
 491   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 492   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 493   int  vtable_index() const                      { return _vtable_index; }
 494   void set_vtable_index(int index);
 495   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 496   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 497   int  itable_index() const                      { assert(valid_itable_index(), "");
 498                                                    return itable_index_max - _vtable_index; }
 499   void set_itable_index(int index);
 500 
 501   // interpreter entry
 502   address interpreter_entry() const              { return _i2i_entry; }
 503   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 504   void set_interpreter_entry(address entry) {
 505     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 506     if (_i2i_entry != entry) {
 507       _i2i_entry = entry;
 508     }
 509     if (_from_interpreted_entry != entry) {
 510       _from_interpreted_entry = entry;
 511     }
 512   }
 513 
 514   // native function (used for native methods only)
 515   enum {
 516     native_bind_event_is_interesting = true
 517   };
 518   address native_function() const                { return *(native_function_addr()); }
 519   address critical_native_function();
 520 
 521   // Must specify a real function (not NULL).
 522   // Use clear_native_function() to unregister.
 523   void set_native_function(address function, bool post_event_flag);
 524   bool has_native_function() const;
 525   void clear_native_function();
 526 
 527   // signature handler (used for native methods only)
 528   address signature_handler() const              { return *(signature_handler_addr()); }
 529   void set_signature_handler(address handler);
 530 
 531   // Interpreter oopmap support
 532   void mask_for(int bci, InterpreterOopMap* mask);
 533 
 534   // operations on invocation counter
 535   void print_invocation_count();
 536 
 537   // byte codes
 538   void    set_code(address code)      { return constMethod()->set_code(code); }
 539   address code_base() const           { return constMethod()->code_base(); }
 540   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 541 
 542   // prints byte codes
 543   void print_codes() const            { print_codes_on(tty); }
 544   void print_codes_on(outputStream* st) const;
 545   void print_codes_on(int from, int to, outputStream* st) const;
 546 
 547   // method parameters
 548   bool has_method_parameters() const
 549                          { return constMethod()->has_method_parameters(); }
 550   int method_parameters_length() const
 551                          { return constMethod()->method_parameters_length(); }
 552   MethodParametersElement* method_parameters_start() const
 553                           { return constMethod()->method_parameters_start(); }
 554 
 555   // checked exceptions
 556   int checked_exceptions_length() const
 557                          { return constMethod()->checked_exceptions_length(); }
 558   CheckedExceptionElement* checked_exceptions_start() const
 559                           { return constMethod()->checked_exceptions_start(); }
 560 
 561   // localvariable table
 562   bool has_localvariable_table() const
 563                           { return constMethod()->has_localvariable_table(); }
 564   int localvariable_table_length() const
 565                         { return constMethod()->localvariable_table_length(); }
 566   LocalVariableTableElement* localvariable_table_start() const
 567                          { return constMethod()->localvariable_table_start(); }
 568 
 569   bool has_linenumber_table() const
 570                               { return constMethod()->has_linenumber_table(); }
 571   u_char* compressed_linenumber_table() const
 572                        { return constMethod()->compressed_linenumber_table(); }
 573 
 574   // method holder (the Klass* holding this method)
 575   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 576 
 577   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 578   Symbol* klass_name() const;                    // returns the name of the method holder
 579   BasicType result_type() const;                 // type of the method result
 580   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 581   bool is_returning_vt() const                   { BasicType r = result_type(); return r == T_VALUETYPE; }
 582   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 583 #ifdef ASSERT
 584   ValueKlass* returned_value_type(Thread* thread) const;
 585 #endif
 586 
 587   // Checked exceptions thrown by this method (resolved to mirrors)
 588   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 589 
 590   // Access flags
 591   bool is_public() const                         { return access_flags().is_public();      }
 592   bool is_private() const                        { return access_flags().is_private();     }
 593   bool is_protected() const                      { return access_flags().is_protected();   }
 594   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 595   bool is_static() const                         { return access_flags().is_static();      }
 596   bool is_final() const                          { return access_flags().is_final();       }
 597   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 598   bool is_native() const                         { return access_flags().is_native();      }
 599   bool is_abstract() const                       { return access_flags().is_abstract();    }
 600   bool is_strict() const                         { return access_flags().is_strict();      }
 601   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 602 
 603   // returns true if contains only return operation
 604   bool is_empty_method() const;
 605 
 606   // returns true if this is a vanilla constructor
 607   bool is_vanilla_constructor() const;
 608 
 609   // checks method and its method holder
 610   bool is_final_method() const;
 611   bool is_final_method(AccessFlags class_access_flags) const;
 612   // interface method declared with 'default' - excludes private interface methods
 613   bool is_default_method() const;
 614 
 615   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 616   bool can_be_statically_bound() const;
 617   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 618 
 619   // returns true if the method has any backward branches.
 620   bool has_loops() {
 621     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 622   };
 623 
 624   bool compute_has_loops_flag();
 625 
 626   bool has_jsrs() {
 627     return access_flags().has_jsrs();
 628   };
 629   void set_has_jsrs() {
 630     _access_flags.set_has_jsrs();
 631   }
 632 
 633   // returns true if the method has any monitors.
 634   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 635   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 636 
 637   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 638 
 639   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 640   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 641   // has not been computed yet.
 642   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 643   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 644 
 645   // returns true if the method is an accessor function (setter/getter).
 646   bool is_accessor() const;
 647 
 648   // returns true if the method is a getter
 649   bool is_getter() const;
 650 
 651   // returns true if the method is a setter
 652   bool is_setter() const;
 653 
 654   // returns true if the method does nothing but return a constant of primitive type
 655   bool is_constant_getter() const;
 656 
 657   // returns true if the method is an initializer (<init> or <clinit>).
 658   bool is_initializer() const;
 659 
 660   // returns true if the method is static OR if the classfile version < 51
 661   bool has_valid_initializer_flags() const;
 662 
 663   // returns true if the method name is <clinit> and the method has
 664   // valid static initializer flags.
 665   bool is_static_initializer() const;
 666 
 667   // returns true if the method name is <init>
 668   bool is_object_initializer() const;
 669 
 670   // compiled code support
 671   // NOTE: code() is inherently racy as deopt can be clearing code
 672   // simultaneously. Use with caution.
 673   bool has_compiled_code() const                 { return code() != NULL; }
 674 
 675 #ifdef TIERED
 676   bool has_aot_code() const                      { return aot_code() != NULL; }
 677 #endif
 678 
 679   // sizing
 680   static int header_size()                       {
 681     return align_size_up(sizeof(Method), wordSize) / wordSize;
 682   }
 683   static int size(bool is_native);
 684   int size() const                               { return method_size(); }
 685 #if INCLUDE_SERVICES
 686   void collect_statistics(KlassSizeStats *sz) const;
 687 #endif
 688   void log_touched(TRAPS);
 689   static void print_touched_methods(outputStream* out);
 690 
 691   // interpreter support
 692   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 693   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 694   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 695   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 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 
 710   // for code generation
 711   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 712   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 713   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 714 
 715   static ByteSize max_vt_buffer_offset()         { return byte_offset_of(Method, _max_vt_buffer); }
 716 
 717   // Static methods that are used to implement member methods where an exposed this pointer
 718   // is needed due to possible GCs
 719   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 720 
 721   // Returns the byte code index from the byte code pointer
 722   int     bci_from(address bcp) const;
 723   address bcp_from(int bci) const;
 724   address bcp_from(address bcp) const;
 725   int validate_bci_from_bcp(address bcp) const;
 726   int validate_bci(int bci) const;
 727 
 728   // Returns the line number for a bci if debugging information for the method is prowided,
 729   // -1 is returned otherwise.
 730   int line_number_from_bci(int bci) const;
 731 
 732   // Reflection support
 733   bool is_overridden_in(Klass* k) const;
 734 
 735   // Stack walking support
 736   bool is_ignored_by_security_stack_walk() const;
 737 
 738   // JSR 292 support
 739   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 740   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 741   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 742   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 743                                                    Symbol* signature, //anything at all
 744                                                    TRAPS);
 745   static Klass* check_non_bcp_klass(Klass* klass);
 746 
 747   enum {
 748     // How many extra stack entries for invokedynamic
 749     extra_stack_entries_for_jsr292 = 1
 750   };
 751 
 752   // this operates only on invoke methods:
 753   // presize interpreter frames for extra interpreter stack entries, if needed
 754   // Account for the extra appendix argument for invokehandle/invokedynamic
 755   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 756   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 757 
 758   // RedefineClasses() support:
 759   bool is_old() const                               { return access_flags().is_old(); }
 760   void set_is_old()                                 { _access_flags.set_is_old(); }
 761   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 762   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 763   bool is_deleted() const                           { return access_flags().is_deleted(); }
 764   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 765 
 766   bool is_running_emcp() const {
 767     // EMCP methods are old but not obsolete or deleted. Equivalent
 768     // Modulo Constant Pool means the method is equivalent except
 769     // the constant pool and instructions that access the constant
 770     // pool might be different.
 771     // If a breakpoint is set in a redefined method, its EMCP methods that are
 772     // still running must have a breakpoint also.
 773     return (_flags & _running_emcp) != 0;
 774   }
 775 
 776   void set_running_emcp(bool x) {
 777     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 778   }
 779 
 780   bool on_stack() const                             { return access_flags().on_stack(); }
 781   void set_on_stack(const bool value);
 782 
 783   // see the definition in Method*.cpp for the gory details
 784   bool should_not_be_cached() const;
 785 
 786   // JVMTI Native method prefixing support:
 787   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 788   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 789 
 790   // Rewriting support
 791   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 792                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 793 
 794   // jmethodID handling
 795   // Because the useful life-span of a jmethodID cannot be determined,
 796   // once created they are never reclaimed.  The methods to which they refer,
 797   // however, can be GC'ed away if the class is unloaded or if the method is
 798   // made obsolete or deleted -- in these cases, the jmethodID
 799   // refers to NULL (as is the case for any weak reference).
 800   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 801   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 802 
 803   // Ensure there is enough capacity in the internal tracking data
 804   // structures to hold the number of jmethodIDs you plan to generate.
 805   // This saves substantial time doing allocations.
 806   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 807 
 808   // Use resolve_jmethod_id() in situations where the caller is expected
 809   // to provide a valid jmethodID; the only sanity checks are in asserts;
 810   // result guaranteed not to be NULL.
 811   inline static Method* resolve_jmethod_id(jmethodID mid) {
 812     assert(mid != NULL, "JNI method id should not be null");
 813     return *((Method**)mid);
 814   }
 815 
 816   // Use checked_resolve_jmethod_id() in situations where the caller
 817   // should provide a valid jmethodID, but might not. NULL is returned
 818   // when the jmethodID does not refer to a valid method.
 819   static Method* checked_resolve_jmethod_id(jmethodID mid);
 820 
 821   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 822   static bool is_method_id(jmethodID mid);
 823 
 824   // Clear methods
 825   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 826   static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 827 
 828   // Get this method's jmethodID -- allocate if it doesn't exist
 829   jmethodID jmethod_id()                            { return method_holder()->get_jmethod_id(this); }
 830 
 831   // Lookup the jmethodID for this method.  Return NULL if not found.
 832   // NOTE that this function can be called from a signal handler
 833   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 834   // needs to be async-safe. No allocation should be done and
 835   // so handles are not used to avoid deadlock.
 836   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 837 
 838   // Support for inlining of intrinsic methods
 839   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 840   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 841 
 842   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 843   void init_intrinsic_id();     // updates from _none if a match
 844   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 845 
 846   bool caller_sensitive() {
 847     return (_flags & _caller_sensitive) != 0;
 848   }
 849   void set_caller_sensitive(bool x) {
 850     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 851   }
 852 
 853   bool force_inline() {
 854     return (_flags & _force_inline) != 0;
 855   }
 856   void set_force_inline(bool x) {
 857     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 858   }
 859 
 860   bool dont_inline() {
 861     return (_flags & _dont_inline) != 0;
 862   }
 863   void set_dont_inline(bool x) {
 864     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 865   }
 866 
 867   bool is_hidden() {
 868     return (_flags & _hidden) != 0;
 869   }
 870   void set_hidden(bool x) {
 871     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 872   }
 873 
 874   bool intrinsic_candidate() {
 875     return (_flags & _intrinsic_candidate) != 0;
 876   }
 877   void set_intrinsic_candidate(bool x) {
 878     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 879   }
 880 
 881   bool has_injected_profile() {
 882     return (_flags & _has_injected_profile) != 0;
 883   }
 884   void set_has_injected_profile(bool x) {
 885     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 886   }
 887 
 888   bool has_reserved_stack_access() {
 889     return (_flags & _reserved_stack_access) != 0;
 890   }
 891 
 892   void set_has_reserved_stack_access(bool x) {
 893     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 894   }
 895 
 896   TRACE_DEFINE_FLAG_ACCESSOR;
 897 
 898   ConstMethod::MethodType method_type() const {
 899       return _constMethod->method_type();
 900   }
 901   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 902 
 903   // On-stack replacement support
 904   bool has_osr_nmethod(int level, bool match_level) {
 905    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 906   }
 907 
 908   int mark_osr_nmethods() {
 909     return method_holder()->mark_osr_nmethods(this);
 910   }
 911 
 912   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 913     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 914   }
 915 
 916   // Inline cache support
 917   void cleanup_inline_caches();
 918 
 919   // Find if klass for method is loaded
 920   bool is_klass_loaded_by_klass_index(int klass_index) const;
 921   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 922 
 923   // Indicates whether compilation failed earlier for this method, or
 924   // whether it is not compilable for another reason like having a
 925   // breakpoint set in it.
 926   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 927   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 928   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 929     set_not_compilable(comp_level, false);
 930   }
 931   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 932   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 933   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 934     set_not_osr_compilable(comp_level, false);
 935   }
 936   bool is_always_compilable() const;
 937 
 938  private:
 939   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 940 
 941  public:
 942   MethodCounters* get_method_counters(TRAPS) {
 943     if (_method_counters == NULL) {
 944       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 945     }
 946     return _method_counters;
 947   }
 948 
 949   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 950   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 951   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 952   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 953   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 954   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 955 
 956   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 957   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 958   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 959   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 960   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 961   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 962 
 963   // Background compilation support
 964   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 965   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 966   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 967 
 968   // Resolve all classes in signature, return 'true' if successful
 969   static bool load_signature_classes(methodHandle m, TRAPS);
 970 
 971   // Return if true if not all classes references in signature, including return type, has been loaded
 972   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 973 
 974   // Printing
 975   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 976 #if INCLUDE_JVMTI
 977   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 978 #else
 979   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 980 #endif
 981 
 982   // Helper routine used for method sorting
 983   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 984 
 985   // Deallocation function for redefine classes or if an error occurs
 986   void deallocate_contents(ClassLoaderData* loader_data);
 987 
 988   // Printing
 989 #ifndef PRODUCT
 990   void print_on(outputStream* st) const;
 991 #endif
 992   void print_value_on(outputStream* st) const;
 993   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
 994 
 995   const char* internal_name() const { return "{method}"; }
 996 
 997   // Check for valid method pointer
 998   static bool has_method_vptr(const void* ptr);
 999   bool is_valid_method() const;
1000 
1001   // Verify
1002   void verify() { verify_on(tty); }
1003   void verify_on(outputStream* st);
1004 
1005  private:
1006 
1007   // Inlined elements
1008   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1009   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1010 };
1011 
1012 
1013 // Utility class for compressing line number tables
1014 
1015 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1016  private:
1017   int _bci;
1018   int _line;
1019  public:
1020   // Constructor
1021   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1022   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1023 
1024   // Write (bci, line number) pair to stream
1025   void write_pair_regular(int bci_delta, int line_delta);
1026 
1027   inline void write_pair_inline(int bci, int line) {
1028     int bci_delta = bci - _bci;
1029     int line_delta = line - _line;
1030     _bci = bci;
1031     _line = line;
1032     // Skip (0,0) deltas - they do not add information and conflict with terminator.
1033     if (bci_delta == 0 && line_delta == 0) return;
1034     // Check if bci is 5-bit and line number 3-bit unsigned.
1035     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1036       // Compress into single byte.
1037       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1038       // Check that value doesn't match escape character.
1039       if (value != 0xFF) {
1040         write_byte(value);
1041         return;
1042       }
1043     }
1044     write_pair_regular(bci_delta, line_delta);
1045   }
1046 
1047 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1048 // Disabling optimization doesn't work for methods in header files
1049 // so we force it to call through the non-optimized version in the .cpp.
1050 // It's gross, but it's the only way we can ensure that all callers are
1051 // fixed.  _MSC_VER is defined by the windows compiler
1052 #if defined(_M_AMD64) && _MSC_VER >= 1400
1053   void write_pair(int bci, int line);
1054 #else
1055   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1056 #endif
1057 
1058   // Write end-of-stream marker
1059   void write_terminator()                        { write_byte(0); }
1060 };
1061 
1062 
1063 // Utility class for decompressing line number tables
1064 
1065 class CompressedLineNumberReadStream: public CompressedReadStream {
1066  private:
1067   int _bci;
1068   int _line;
1069  public:
1070   // Constructor
1071   CompressedLineNumberReadStream(u_char* buffer);
1072   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1073   bool read_pair();
1074   // Accessing bci and line number (after calling read_pair)
1075   int bci() const                               { return _bci; }
1076   int line() const                              { return _line; }
1077 };
1078 
1079 
1080 #if INCLUDE_JVMTI
1081 
1082 /// Fast Breakpoints.
1083 
1084 // If this structure gets more complicated (because bpts get numerous),
1085 // move it into its own header.
1086 
1087 // There is presently no provision for concurrent access
1088 // to breakpoint lists, which is only OK for JVMTI because
1089 // breakpoints are written only at safepoints, and are read
1090 // concurrently only outside of safepoints.
1091 
1092 class BreakpointInfo : public CHeapObj<mtClass> {
1093   friend class VMStructs;
1094  private:
1095   Bytecodes::Code  _orig_bytecode;
1096   int              _bci;
1097   u2               _name_index;       // of method
1098   u2               _signature_index;  // of method
1099   BreakpointInfo*  _next;             // simple storage allocation
1100 
1101  public:
1102   BreakpointInfo(Method* m, int bci);
1103 
1104   // accessors
1105   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1106   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1107   int         bci()                                   { return _bci; }
1108 
1109   BreakpointInfo*          next() const               { return _next; }
1110   void                 set_next(BreakpointInfo* n)    { _next = n; }
1111 
1112   // helps for searchers
1113   bool match(const Method* m, int bci) {
1114     return bci == _bci && match(m);
1115   }
1116 
1117   bool match(const Method* m) {
1118     return _name_index == m->name_index() &&
1119       _signature_index == m->signature_index();
1120   }
1121 
1122   void set(Method* method);
1123   void clear(Method* method);
1124 };
1125 
1126 #endif // INCLUDE_JVMTI
1127 
1128 // Utility class for access exception handlers
1129 class ExceptionTable : public StackObj {
1130  private:
1131   ExceptionTableElement* _table;
1132   u2  _length;
1133 
1134  public:
1135   ExceptionTable(const Method* m) {
1136     if (m->has_exception_handler()) {
1137       _table = m->exception_table_start();
1138       _length = m->exception_table_length();
1139     } else {
1140       _table = NULL;
1141       _length = 0;
1142     }
1143   }
1144 
1145   int length() const {
1146     return _length;
1147   }
1148 
1149   u2 start_pc(int idx) const {
1150     assert(idx < _length, "out of bounds");
1151     return _table[idx].start_pc;
1152   }
1153 
1154   void set_start_pc(int idx, u2 value) {
1155     assert(idx < _length, "out of bounds");
1156     _table[idx].start_pc = value;
1157   }
1158 
1159   u2 end_pc(int idx) const {
1160     assert(idx < _length, "out of bounds");
1161     return _table[idx].end_pc;
1162   }
1163 
1164   void set_end_pc(int idx, u2 value) {
1165     assert(idx < _length, "out of bounds");
1166     _table[idx].end_pc = value;
1167   }
1168 
1169   u2 handler_pc(int idx) const {
1170     assert(idx < _length, "out of bounds");
1171     return _table[idx].handler_pc;
1172   }
1173 
1174   void set_handler_pc(int idx, u2 value) {
1175     assert(idx < _length, "out of bounds");
1176     _table[idx].handler_pc = value;
1177   }
1178 
1179   u2 catch_type_index(int idx) const {
1180     assert(idx < _length, "out of bounds");
1181     return _table[idx].catch_type_index;
1182   }
1183 
1184   void set_catch_type_index(int idx, u2 value) {
1185     assert(idx < _length, "out of bounds");
1186     _table[idx].catch_type_index = value;
1187   }
1188 };
1189 
1190 #endif // SHARE_VM_OOPS_METHODOOP_HPP