1 /*
   2  * Copyright (c) 1997, 2021, 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 "classfile/vmSymbols.hpp"
  29 #include "code/compressedStream.hpp"
  30 #include "compiler/compilerDefinitions.hpp"
  31 #include "interpreter/invocationCounter.hpp"
  32 #include "oops/annotations.hpp"
  33 #include "oops/constantPool.hpp"
  34 #include "oops/methodCounters.hpp"
  35 #include "oops/instanceKlass.hpp"
  36 #include "oops/oop.hpp"
  37 #include "oops/typeArrayOop.hpp"
  38 #include "utilities/accessFlags.hpp"
  39 #include "utilities/align.hpp"
  40 #include "utilities/growableArray.hpp"
  41 #include "utilities/macros.hpp"
  42 #include "utilities/vmEnums.hpp"
  43 #if INCLUDE_JFR
  44 #include "jfr/support/jfrTraceIdExtension.hpp"
  45 #endif
  46 
  47 
  48 // A Method represents a Java method.
  49 //
  50 // Note that most applications load thousands of methods, so keeping the size of this
  51 // class small has a big impact on footprint.
  52 //
  53 // Note that native_function and signature_handler have to be at fixed offsets
  54 // (required by the interpreter)
  55 //
  56 //  Method embedded field layout (after declared fields):
  57 //   [EMBEDDED native_function       (present only if native) ]
  58 //   [EMBEDDED signature_handler     (present only if native) ]
  59 
  60 class CheckedExceptionElement;
  61 class LocalVariableTableElement;
  62 class AdapterHandlerEntry;
  63 class MethodData;
  64 class MethodCounters;
  65 class ConstMethod;
  66 class InlineTableSizes;
  67 class CompiledMethod;
  68 class InterpreterOopMap;
  69 
  70 class Method : public Metadata {
  71  friend class VMStructs;
  72  friend class JVMCIVMStructs;
  73  private:
  74   // If you add a new field that points to any metaspace object, you
  75   // must add this field to Method::metaspace_pointers_do().
  76   ConstMethod*      _constMethod;                // Method read-only data.
  77   MethodData*       _method_data;
  78   MethodCounters*   _method_counters;
  79   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     _scoped                = 1 << 7,
  95     _changes_current_thread = 1 << 8,
  96     _jvmti_mount_transition = 1 << 9,
  97   };
  98   mutable u2 _flags;
  99 
 100   JFR_ONLY(DEFINE_TRACE_FLAG;)
 101 
 102 #ifndef PRODUCT
 103   int64_t _compiled_invocation_count;
 104 #endif
 105   // Entry point for calling both from and to the interpreter.
 106   address _i2i_entry;           // All-args-on-stack calling convention
 107   // Entry point for calling from compiled code, to compiled code if it exists
 108   // or else the interpreter.
 109   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 110   // The entry point for calling both from and to compiled code is
 111   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 112   // field can come and go.  It can transition from NULL to not-null at any
 113   // time (whenever a compile completes).  It can transition from not-null to
 114   // NULL only at safepoints (because of a de-opt).
 115   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 116   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 117 
 118   int _num_stack_arg_slots;
 119 
 120   // Constructor
 121   Method(ConstMethod* xconst, AccessFlags access_flags);
 122  public:
 123 
 124   static Method* allocate(ClassLoaderData* loader_data,
 125                           int byte_code_size,
 126                           AccessFlags access_flags,
 127                           InlineTableSizes* sizes,
 128                           ConstMethod::MethodType method_type,
 129                           TRAPS);
 130 
 131   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 132   Method(){}
 133 
 134   virtual bool is_method() const { return true; }
 135 
 136   void restore_unshareable_info(TRAPS);
 137 
 138   // accessors for instance variables
 139 
 140   ConstMethod* constMethod() const             { return _constMethod; }
 141   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 142 
 143 
 144   static address make_adapters(const methodHandle& mh, TRAPS);
 145   address from_compiled_entry() const;
 146   address from_compiled_entry_no_trampoline() const;
 147   address from_interpreted_entry() const;
 148 
 149   // access flag
 150   AccessFlags access_flags() const               { return _access_flags;  }
 151   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 152 
 153   // name
 154   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 155   int name_index() const                         { return constMethod()->name_index();         }
 156   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 157 
 158   // signature
 159   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 160   int signature_index() const                    { return constMethod()->signature_index();         }
 161   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 162 
 163   // generics support
 164   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 165   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 166   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 167 
 168   // annotations support
 169   AnnotationArray* annotations() const           {
 170     return constMethod()->method_annotations();
 171   }
 172   AnnotationArray* parameter_annotations() const {
 173     return constMethod()->parameter_annotations();
 174   }
 175   AnnotationArray* annotation_default() const    {
 176     return constMethod()->default_annotations();
 177   }
 178   AnnotationArray* type_annotations() const      {
 179     return constMethod()->type_annotations();
 180   }
 181 
 182   // Helper routine: get klass name + "." + method name + signature as
 183   // C string, for the purpose of providing more useful
 184   // fatal error handling. The string is allocated in resource
 185   // area if a buffer is not provided by the caller.
 186   char* name_and_sig_as_C_string() const;
 187   char* name_and_sig_as_C_string(char* buf, int size) const;
 188 
 189   // Static routine in the situations we don't have a Method*
 190   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 191   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 192 
 193   // Get return type + klass name + "." + method name + ( parameters types )
 194   // as a C string or print it to an outputStream.
 195   // This is to be used to assemble strings passed to Java, so that
 196   // the text more resembles Java code. Used in exception messages.
 197   // Memory is allocated in the resource area; the caller needs
 198   // a ResourceMark.
 199   const char* external_name() const;
 200   void  print_external_name(outputStream *os) const;
 201 
 202   static const char* external_name(                  Klass* klass, Symbol* method_name, Symbol* signature);
 203   static void  print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
 204 
 205   Bytecodes::Code java_code_at(int bci) const {
 206     return Bytecodes::java_code_at(this, bcp_from(bci));
 207   }
 208   Bytecodes::Code code_at(int bci) const {
 209     return Bytecodes::code_at(this, bcp_from(bci));
 210   }
 211 
 212   // JVMTI breakpoints
 213 #if !INCLUDE_JVMTI
 214   Bytecodes::Code orig_bytecode_at(int bci) const {
 215     ShouldNotReachHere();
 216     return Bytecodes::_shouldnotreachhere;
 217   }
 218   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 219     ShouldNotReachHere();
 220   };
 221   u2   number_of_breakpoints() const {return 0;}
 222 #else // !INCLUDE_JVMTI
 223   Bytecodes::Code orig_bytecode_at(int bci) const;
 224   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 225   void set_breakpoint(int bci);
 226   void clear_breakpoint(int bci);
 227   void clear_all_breakpoints();
 228   // Tracking number of breakpoints, for fullspeed debugging.
 229   // Only mutated by VM thread.
 230   u2   number_of_breakpoints() const {
 231     MethodCounters* mcs = method_counters();
 232     if (mcs == NULL) {
 233       return 0;
 234     } else {
 235       return mcs->number_of_breakpoints();
 236     }
 237   }
 238   void incr_number_of_breakpoints(Thread* current) {
 239     MethodCounters* mcs = get_method_counters(current);
 240     if (mcs != NULL) {
 241       mcs->incr_number_of_breakpoints();
 242     }
 243   }
 244   void decr_number_of_breakpoints(Thread* current) {
 245     MethodCounters* mcs = get_method_counters(current);
 246     if (mcs != NULL) {
 247       mcs->decr_number_of_breakpoints();
 248     }
 249   }
 250   // Initialization only
 251   void clear_number_of_breakpoints() {
 252     MethodCounters* mcs = method_counters();
 253     if (mcs != NULL) {
 254       mcs->clear_number_of_breakpoints();
 255     }
 256   }
 257 #endif // !INCLUDE_JVMTI
 258 
 259   // index into InstanceKlass methods() array
 260   // note: also used by jfr
 261   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 262   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 263 
 264   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 265   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 266 
 267   // code size
 268   int code_size() const                  { return constMethod()->code_size(); }
 269 
 270   // method size in words
 271   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 272 
 273   // constant pool for Klass* holding this method
 274   ConstantPool* constants() const              { return constMethod()->constants(); }
 275   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 276 
 277   // max stack
 278   // return original max stack size for method verification
 279   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 280   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 281   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 282 
 283   // max locals
 284   int  max_locals() const                        { return constMethod()->max_locals(); }
 285   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 286 
 287   int highest_comp_level() const;
 288   void set_highest_comp_level(int level);
 289   int highest_osr_comp_level() const;
 290   void set_highest_osr_comp_level(int level);
 291 
 292 #if COMPILER2_OR_JVMCI
 293   // Count of times method was exited via exception while interpreting
 294   void interpreter_throwout_increment(Thread* current) {
 295     MethodCounters* mcs = get_method_counters(current);
 296     if (mcs != NULL) {
 297       mcs->interpreter_throwout_increment();
 298     }
 299   }
 300 #endif
 301 
 302   int  interpreter_throwout_count() const        {
 303     MethodCounters* mcs = method_counters();
 304     if (mcs == NULL) {
 305       return 0;
 306     } else {
 307       return mcs->interpreter_throwout_count();
 308     }
 309   }
 310 
 311   // Derive stuff from the signature at load time.
 312   void compute_from_signature(Symbol* sig);
 313 
 314   // size of parameters (receiver if any + arguments)
 315   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 316   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 317 
 318   bool has_stackmap_table() const {
 319     return constMethod()->has_stackmap_table();
 320   }
 321 
 322   Array<u1>* stackmap_data() const {
 323     return constMethod()->stackmap_data();
 324   }
 325 
 326   void set_stackmap_data(Array<u1>* sd) {
 327     constMethod()->set_stackmap_data(sd);
 328   }
 329 
 330   // exception handler table
 331   bool has_exception_handler() const
 332                              { return constMethod()->has_exception_handler(); }
 333   int exception_table_length() const
 334                              { return constMethod()->exception_table_length(); }
 335   ExceptionTableElement* exception_table_start() const
 336                              { return constMethod()->exception_table_start(); }
 337 
 338   // Finds the first entry point bci of an exception handler for an
 339   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 340   // for ex_klass indicates that the exception klass is not known; in
 341   // this case it matches any constraint class. Returns -1 if the
 342   // exception cannot be handled in this method. The handler
 343   // constraint classes are loaded if necessary. Note that this may
 344   // throw an exception if loading of the constraint classes causes
 345   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 346   // If an exception is thrown, returns the bci of the
 347   // exception handler which caused the exception to be thrown, which
 348   // is needed for proper retries. See, for example,
 349   // InterpreterRuntime::exception_handler_for_exception.
 350   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 351 
 352   static bool register_native(Klass* k,
 353                               Symbol* name,
 354                               Symbol* signature,
 355                               address entry,
 356                               TRAPS);
 357 
 358   // method data access
 359   MethodData* method_data() const              {
 360     return _method_data;
 361   }
 362 
 363   void set_method_data(MethodData* data);
 364 
 365   MethodCounters* method_counters() const {
 366     return _method_counters;
 367   }
 368 
 369   void clear_method_counters() {
 370     _method_counters = NULL;
 371   }
 372 
 373   bool init_method_counters(MethodCounters* counters);
 374 
 375   int prev_event_count() const {
 376     MethodCounters* mcs = method_counters();
 377     return mcs == NULL ? 0 : mcs->prev_event_count();
 378   }
 379   void set_prev_event_count(int count) {
 380     MethodCounters* mcs = method_counters();
 381     if (mcs != NULL) {
 382       mcs->set_prev_event_count(count);
 383     }
 384   }
 385   jlong prev_time() const {
 386     MethodCounters* mcs = method_counters();
 387     return mcs == NULL ? 0 : mcs->prev_time();
 388   }
 389   void set_prev_time(jlong time) {
 390     MethodCounters* mcs = method_counters();
 391     if (mcs != NULL) {
 392       mcs->set_prev_time(time);
 393     }
 394   }
 395   float rate() const {
 396     MethodCounters* mcs = method_counters();
 397     return mcs == NULL ? 0 : mcs->rate();
 398   }
 399   void set_rate(float rate) {
 400     MethodCounters* mcs = method_counters();
 401     if (mcs != NULL) {
 402       mcs->set_rate(rate);
 403     }
 404   }
 405 
 406   int nmethod_age() const {
 407     if (method_counters() == NULL) {
 408       return INT_MAX;
 409     } else {
 410       return method_counters()->nmethod_age();
 411     }
 412   }
 413 
 414   int invocation_count() const;
 415   int backedge_count() const;
 416 
 417   bool was_executed_more_than(int n);
 418   bool was_never_executed()                     { return !was_executed_more_than(0);  }
 419 
 420   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 421 
 422   static MethodCounters* build_method_counters(Thread* current, Method* m);
 423 
 424   int interpreter_invocation_count()            { return invocation_count();          }
 425 
 426 #ifndef PRODUCT
 427   int64_t  compiled_invocation_count() const    { return _compiled_invocation_count;}
 428   void set_compiled_invocation_count(int count) { _compiled_invocation_count = (int64_t)count; }
 429 #else
 430   // for PrintMethodData in a product build
 431   int64_t  compiled_invocation_count() const    { return 0; }
 432 #endif // not PRODUCT
 433 
 434   // Clear (non-shared space) pointers which could not be relevant
 435   // if this (shared) method were mapped into another JVM.
 436   void remove_unshareable_info();
 437 
 438   // nmethod/verified compiler entry
 439   address verified_code_entry();
 440   bool check_code() const;      // Not inline to avoid circular ref
 441   CompiledMethod* volatile code() const;
 442 
 443   // Locks CompiledMethod_lock if not held.
 444   void unlink_code(CompiledMethod *compare);
 445   // Locks CompiledMethod_lock if not held.
 446   void unlink_code();
 447 
 448 private:
 449   // Either called with CompiledMethod_lock held or from constructor.
 450   void clear_code();
 451 
 452 public:
 453   static void set_code(const methodHandle& mh, CompiledMethod* code);
 454   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 455     _adapter = adapter;
 456   }
 457   void set_from_compiled_entry(address entry) {
 458     _from_compiled_entry =  entry;
 459   }
 460 
 461   address get_i2c_entry();
 462   address get_c2i_entry();
 463   address get_c2i_unverified_entry();
 464   address get_c2i_no_clinit_check_entry();
 465   AdapterHandlerEntry* adapter() const {
 466     return _adapter;
 467   }
 468   // setup entry points
 469   void link_method(const methodHandle& method, TRAPS);
 470   // clear entry points. Used by sharing code during dump time
 471   void unlink_method() NOT_CDS_RETURN;
 472 
 473   // the number of argument reg slots that the compiled method uses on the stack.
 474   int num_stack_arg_slots() const { return _num_stack_arg_slots;  };
 475 
 476   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 477   virtual MetaspaceObj::Type type() const { return MethodType; }
 478 
 479   // vtable index
 480   enum VtableIndexFlag {
 481     // Valid vtable indexes are non-negative (>= 0).
 482     // These few negative values are used as sentinels.
 483     itable_index_max        = -10, // first itable index, growing downward
 484     pending_itable_index    = -9,  // itable index will be assigned
 485     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 486     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 487     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 488     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 489   };
 490   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 491   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 492   int  vtable_index() const                      { return _vtable_index; }
 493   void set_vtable_index(int index);
 494   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 495   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 496   int  itable_index() const                      { assert(valid_itable_index(), "");
 497                                                    return itable_index_max - _vtable_index; }
 498   void set_itable_index(int index);
 499 
 500   // interpreter entry
 501   address interpreter_entry() const              { return _i2i_entry; }
 502   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 503   void set_interpreter_entry(address entry) {
 504     if (_i2i_entry != entry) {
 505       _i2i_entry = entry;
 506     }
 507     if (_from_interpreted_entry != entry) {
 508       _from_interpreted_entry = entry;
 509     }
 510   }
 511 
 512   // native function (used for native methods only)
 513   enum {
 514     native_bind_event_is_interesting = true
 515   };
 516   address native_function() const                { return *(native_function_addr()); }
 517 
 518   // Must specify a real function (not NULL).
 519   // Use clear_native_function() to unregister.
 520   void set_native_function(address function, bool post_event_flag);
 521   bool has_native_function() const;
 522   void clear_native_function();
 523 
 524   // signature handler (used for native methods only)
 525   address signature_handler() const              { return *(signature_handler_addr()); }
 526   void set_signature_handler(address handler);
 527 
 528   // Interpreter oopmap support
 529   void mask_for(int bci, InterpreterOopMap* mask);
 530 
 531   // operations on invocation counter
 532   void print_invocation_count();
 533 
 534   // byte codes
 535   void    set_code(address code)      { return constMethod()->set_code(code); }
 536   address code_base() const           { return constMethod()->code_base(); }
 537   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 538 
 539   // prints byte codes
 540   void print_codes() const            { print_codes_on(tty); }
 541   void print_codes_on(outputStream* st) const;
 542   void print_codes_on(int from, int to, outputStream* st) const;
 543 
 544   // method parameters
 545   bool has_method_parameters() const
 546                          { return constMethod()->has_method_parameters(); }
 547   int method_parameters_length() const
 548                          { return constMethod()->method_parameters_length(); }
 549   MethodParametersElement* method_parameters_start() const
 550                           { return constMethod()->method_parameters_start(); }
 551 
 552   // checked exceptions
 553   int checked_exceptions_length() const
 554                          { return constMethod()->checked_exceptions_length(); }
 555   CheckedExceptionElement* checked_exceptions_start() const
 556                           { return constMethod()->checked_exceptions_start(); }
 557 
 558   // localvariable table
 559   bool has_localvariable_table() const
 560                           { return constMethod()->has_localvariable_table(); }
 561   int localvariable_table_length() const
 562                         { return constMethod()->localvariable_table_length(); }
 563   LocalVariableTableElement* localvariable_table_start() const
 564                          { return constMethod()->localvariable_table_start(); }
 565 
 566   bool has_linenumber_table() const
 567                               { return constMethod()->has_linenumber_table(); }
 568   u_char* compressed_linenumber_table() const
 569                        { return constMethod()->compressed_linenumber_table(); }
 570 
 571   // method holder (the Klass* holding this method)
 572   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 573 
 574   Symbol* klass_name() const;                    // returns the name of the method holder
 575   BasicType result_type() const                  { return constMethod()->result_type(); }
 576   bool is_returning_oop() const                  { BasicType r = result_type(); return is_reference_type(r); }
 577   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 578 
 579   // Checked exceptions thrown by this method (resolved to mirrors)
 580   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 581 
 582   // Access flags
 583   bool is_public() const                         { return access_flags().is_public();      }
 584   bool is_private() const                        { return access_flags().is_private();     }
 585   bool is_protected() const                      { return access_flags().is_protected();   }
 586   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 587   bool is_static() const                         { return access_flags().is_static();      }
 588   bool is_final() const                          { return access_flags().is_final();       }
 589   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 590   bool is_native() const                         { return access_flags().is_native();      }
 591   bool is_abstract() const                       { return access_flags().is_abstract();    }
 592   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 593 
 594   // returns true if contains only return operation
 595   bool is_empty_method() const;
 596 
 597   // returns true if this is a vanilla constructor
 598   bool is_vanilla_constructor() const;
 599 
 600   // checks method and its method holder
 601   bool is_final_method() const;
 602   bool is_final_method(AccessFlags class_access_flags) const;
 603   // interface method declared with 'default' - excludes private interface methods
 604   bool is_default_method() const;
 605 
 606   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 607   bool can_be_statically_bound() const;
 608   bool can_be_statically_bound(InstanceKlass* context) const;
 609   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 610 
 611   // returns true if the method has any backward branches.
 612   bool has_loops() {
 613     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 614   };
 615 
 616   bool compute_has_loops_flag();
 617 
 618   bool has_jsrs() {
 619     return access_flags().has_jsrs();
 620   };
 621   void set_has_jsrs() {
 622     _access_flags.set_has_jsrs();
 623   }
 624 
 625   // returns true if the method has any monitors.
 626   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 627   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 628 
 629   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 630 
 631   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 632   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 633   // has not been computed yet.
 634   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 635   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 636 
 637   // returns true if the method is an accessor function (setter/getter).
 638   bool is_accessor() const;
 639 
 640   // returns true if the method is a getter
 641   bool is_getter() const;
 642 
 643   // returns true if the method is a setter
 644   bool is_setter() const;
 645 
 646   // returns true if the method does nothing but return a constant of primitive type
 647   bool is_constant_getter() const;
 648 
 649   // returns true if the method is an initializer (<init> or <clinit>).
 650   bool is_initializer() const;
 651 
 652   // returns true if the method is static OR if the classfile version < 51
 653   bool has_valid_initializer_flags() const;
 654 
 655   // returns true if the method name is <clinit> and the method has
 656   // valid static initializer flags.
 657   bool is_static_initializer() const;
 658 
 659   // returns true if the method name is <init>
 660   bool is_object_initializer() const;
 661 
 662   // compiled code support
 663   // NOTE: code() is inherently racy as deopt can be clearing code
 664   // simultaneously. Use with caution.
 665   bool has_compiled_code() const;
 666 
 667   bool needs_clinit_barrier() const;
 668 
 669   // sizing
 670   static int header_size()                       {
 671     return align_up((int)sizeof(Method), wordSize) / wordSize;
 672   }
 673   static int size(bool is_native);
 674   int size() const                               { return method_size(); }
 675   void log_touched(Thread* current);
 676   static void print_touched_methods(outputStream* out);
 677 
 678   // interpreter support
 679   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 680   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 681   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 682   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 683   static ByteSize method_data_offset()           {
 684     return byte_offset_of(Method, _method_data);
 685   }
 686   static ByteSize method_counters_offset()       {
 687     return byte_offset_of(Method, _method_counters);
 688   }
 689 #ifndef PRODUCT
 690   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 691 #endif // not PRODUCT
 692   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 693   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 694   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 695   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 696   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 697 
 698   // for code generation
 699   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 700   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 701   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 702 
 703   // Static methods that are used to implement member methods where an exposed this pointer
 704   // is needed due to possible GCs
 705   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 706 
 707   // Returns the byte code index from the byte code pointer
 708   int     bci_from(address bcp) const;
 709   address bcp_from(int bci) const;
 710   address bcp_from(address bcp) const;
 711   int validate_bci_from_bcp(address bcp) const;
 712   int validate_bci(int bci) const;
 713 
 714   // Returns the line number for a bci if debugging information for the method is prowided,
 715   // -1 is returned otherwise.
 716   int line_number_from_bci(int bci) const;
 717 
 718   // Reflection support
 719   bool is_overridden_in(Klass* k) const;
 720 
 721   // Stack walking support
 722   bool is_ignored_by_security_stack_walk() const;
 723 
 724   // JSR 292 support
 725   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 726   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 727   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 728   static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
 729                                                    Symbol* signature, //anything at all
 730                                                    TRAPS);
 731 
 732 
 733   // Continuation
 734   bool is_continuation_enter_intrinsic() const { return intrinsic_id() == vmIntrinsics::_Continuation_enterSpecial; }
 735 
 736   bool is_special_native_intrinsic() const { return is_method_handle_intrinsic() || is_continuation_enter_intrinsic(); }
 737 
 738   static Klass* check_non_bcp_klass(Klass* klass);
 739 
 740   enum {
 741     // How many extra stack entries for invokedynamic
 742     extra_stack_entries_for_jsr292 = 1
 743   };
 744 
 745   // this operates only on invoke methods:
 746   // presize interpreter frames for extra interpreter stack entries, if needed
 747   // Account for the extra appendix argument for invokehandle/invokedynamic
 748   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 749   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 750 
 751   // RedefineClasses() support:
 752   bool is_old() const                               { return access_flags().is_old(); }
 753   void set_is_old()                                 { _access_flags.set_is_old(); }
 754   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 755   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 756   bool is_deleted() const                           { return access_flags().is_deleted(); }
 757   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 758 
 759   bool on_stack() const                             { return access_flags().on_stack(); }
 760   void set_on_stack(const bool value);
 761 
 762   void record_marking_cycle();
 763 
 764   // see the definition in Method*.cpp for the gory details
 765   bool should_not_be_cached() const;
 766 
 767   // JVMTI Native method prefixing support:
 768   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 769   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 770 
 771   // Rewriting support
 772   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 773                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 774 
 775   // jmethodID handling
 776   // Because the useful life-span of a jmethodID cannot be determined,
 777   // once created they are never reclaimed.  The methods to which they refer,
 778   // however, can be GC'ed away if the class is unloaded or if the method is
 779   // made obsolete or deleted -- in these cases, the jmethodID
 780   // refers to NULL (as is the case for any weak reference).
 781   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 782   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 783 
 784   // Ensure there is enough capacity in the internal tracking data
 785   // structures to hold the number of jmethodIDs you plan to generate.
 786   // This saves substantial time doing allocations.
 787   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 788 
 789   // Use resolve_jmethod_id() in situations where the caller is expected
 790   // to provide a valid jmethodID; the only sanity checks are in asserts;
 791   // result guaranteed not to be NULL.
 792   inline static Method* resolve_jmethod_id(jmethodID mid) {
 793     assert(mid != NULL, "JNI method id should not be null");
 794     return *((Method**)mid);
 795   }
 796 
 797   // Use checked_resolve_jmethod_id() in situations where the caller
 798   // should provide a valid jmethodID, but might not. NULL is returned
 799   // when the jmethodID does not refer to a valid method.
 800   static Method* checked_resolve_jmethod_id(jmethodID mid);
 801 
 802   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 803   static bool is_method_id(jmethodID mid);
 804 
 805   // Clear methods
 806   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 807   static void print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 808 
 809   // Get this method's jmethodID -- allocate if it doesn't exist
 810   jmethodID jmethod_id();
 811 
 812   // Lookup the jmethodID for this method.  Return NULL if not found.
 813   // NOTE that this function can be called from a signal handler
 814   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 815   // needs to be async-safe. No allocation should be done and
 816   // so handles are not used to avoid deadlock.
 817   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 818 
 819   // Support for inlining of intrinsic methods
 820   vmIntrinsicID intrinsic_id() const          { return (vmIntrinsicID) _intrinsic_id;           }
 821   void     set_intrinsic_id(vmIntrinsicID id) {                           _intrinsic_id = (u2) id; }
 822 
 823   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 824   void init_intrinsic_id(vmSymbolID klass_id);     // updates from _none if a match
 825   static vmSymbolID klass_id_for_intrinsics(const Klass* holder);
 826 
 827   bool caller_sensitive() {
 828     return (_flags & _caller_sensitive) != 0;
 829   }
 830   void set_caller_sensitive(bool x) {
 831     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 832   }
 833 
 834   bool force_inline() {
 835     return (_flags & _force_inline) != 0;
 836   }
 837   void set_force_inline(bool x) {
 838     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 839   }
 840 
 841   bool dont_inline() {
 842     return (_flags & _dont_inline) != 0;
 843   }
 844   void set_dont_inline(bool x) {
 845     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 846   }
 847 
 848   bool changes_current_thread() {
 849     return (_flags & _changes_current_thread) != 0;
 850   }
 851   void set_changes_current_thread(bool x) {
 852     _flags = x ? (_flags | _changes_current_thread) : (_flags & ~_changes_current_thread);
 853   }
 854 
 855   bool jvmti_mount_transition() {
 856     return (_flags & _jvmti_mount_transition) != 0;
 857   }
 858   void set_jvmti_mount_transition(bool x) {
 859     _flags = x ? (_flags | _jvmti_mount_transition) : (_flags & ~_jvmti_mount_transition);
 860   }
 861 
 862   bool is_hidden() const {
 863     return (_flags & _hidden) != 0;
 864   }
 865 
 866   void set_hidden(bool x) {
 867     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 868   }
 869 
 870   bool is_scoped() const {
 871     return (_flags & _scoped) != 0;
 872   }
 873 
 874   void set_scoped(bool x) {
 875     _flags = x ? (_flags | _scoped) : (_flags & ~_scoped);
 876   }
 877 
 878   bool intrinsic_candidate() {
 879     return (_flags & _intrinsic_candidate) != 0;
 880   }
 881   void set_intrinsic_candidate(bool x) {
 882     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 883   }
 884 
 885   bool has_injected_profile() {
 886     return (_flags & _has_injected_profile) != 0;
 887   }
 888   void set_has_injected_profile(bool x) {
 889     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 890   }
 891 
 892   bool has_reserved_stack_access() {
 893     return (_flags & _reserved_stack_access) != 0;
 894   }
 895 
 896   void set_has_reserved_stack_access(bool x) {
 897     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 898   }
 899 
 900   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 901 
 902   ConstMethod::MethodType method_type() const {
 903       return _constMethod->method_type();
 904   }
 905   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 906 
 907   // On-stack replacement support
 908   bool has_osr_nmethod(int level, bool match_level) {
 909    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 910   }
 911 
 912   int mark_osr_nmethods() {
 913     return method_holder()->mark_osr_nmethods(this);
 914   }
 915 
 916   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 917     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 918   }
 919 
 920   // Find if klass for method is loaded
 921   bool is_klass_loaded_by_klass_index(int klass_index) const;
 922   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 923 
 924   // Indicates whether compilation failed earlier for this method, or
 925   // whether it is not compilable for another reason like having a
 926   // breakpoint set in it.
 927   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 928   void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 929   void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 930     set_not_compilable(reason, comp_level, false);
 931   }
 932   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 933   void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 934   void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 935     set_not_osr_compilable(reason, comp_level, false);
 936   }
 937   bool is_always_compilable() const;
 938 
 939  private:
 940   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 941 
 942  public:
 943   MethodCounters* get_method_counters(Thread* current) {
 944     if (_method_counters == NULL) {
 945       build_method_counters(current, this);
 946     }
 947     return _method_counters;
 948   }
 949 
 950   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 951   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 952   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 953   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 954   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 955   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 956 
 957   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 958   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 959   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 960   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 961   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 962   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 963 
 964   // Background compilation support
 965   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 966   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 967   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 968 
 969   // Resolve all classes in signature, return 'true' if successful
 970   static bool load_signature_classes(const methodHandle& m, TRAPS);
 971 
 972   // Return if true if not all classes references in signature, including return type, has been loaded
 973   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 974 
 975   // Printing
 976   void print_short_name(outputStream* st = tty) const; // prints as klassname::methodname; Exposed so field engineers can debug VM
 977 #if INCLUDE_JVMTI
 978   void print_name(outputStream* st = tty) const; // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
 979 #else
 980   void print_name(outputStream* st = tty) const  PRODUCT_RETURN; // prints as "virtual void foo(int)"
 981 #endif
 982 
 983   typedef int (*method_comparator_func)(Method* a, Method* b);
 984 
 985   // Helper routine used for method sorting
 986   static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = NULL);
 987 
 988   // Deallocation function for redefine classes or if an error occurs
 989   void deallocate_contents(ClassLoaderData* loader_data);
 990 
 991   void release_C_heap_structures();
 992 
 993   Method* get_new_method() const {
 994     InstanceKlass* holder = method_holder();
 995     Method* new_method = holder->method_with_idnum(orig_method_idnum());
 996 
 997     assert(new_method != NULL, "method_with_idnum() should not be NULL");
 998     assert(this != new_method, "sanity check");
 999     return new_method;
1000   }
1001 
1002   // Printing
1003 #ifndef PRODUCT
1004   void print_on(outputStream* st) const;
1005 #endif
1006   void print_value_on(outputStream* st) const;
1007   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1008 
1009   const char* internal_name() const { return "{method}"; }
1010 
1011   // Check for valid method pointer
1012   static bool has_method_vptr(const void* ptr);
1013   static bool is_valid_method(const Method* m);
1014 
1015   // Verify
1016   void verify() { verify_on(tty); }
1017   void verify_on(outputStream* st);
1018 
1019  private:
1020 
1021   // Inlined elements
1022   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1023   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1024 
1025   void set_num_stack_arg_slots();
1026 };
1027 
1028 
1029 // Utility class for compressing line number tables
1030 
1031 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1032  private:
1033   int _bci;
1034   int _line;
1035  public:
1036   // Constructor
1037   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1038   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1039 
1040   // Write (bci, line number) pair to stream
1041   void write_pair_regular(int bci_delta, int line_delta);
1042 
1043   // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1044   // we save it as one byte, otherwise we write a 0xFF escape character
1045   // and use regular compression. 0x0 is used as end-of-stream terminator.
1046   void write_pair_inline(int bci, int line);
1047 
1048   void write_pair(int bci, int line);
1049 
1050   // Write end-of-stream marker
1051   void write_terminator()                        { write_byte(0); }
1052 };
1053 
1054 
1055 // Utility class for decompressing line number tables
1056 
1057 class CompressedLineNumberReadStream: public CompressedReadStream {
1058  private:
1059   int _bci;
1060   int _line;
1061  public:
1062   // Constructor
1063   CompressedLineNumberReadStream(u_char* buffer);
1064   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1065   bool read_pair();
1066   // Accessing bci and line number (after calling read_pair)
1067   int bci() const                               { return _bci; }
1068   int line() const                              { return _line; }
1069 };
1070 
1071 
1072 #if INCLUDE_JVMTI
1073 
1074 /// Fast Breakpoints.
1075 
1076 // If this structure gets more complicated (because bpts get numerous),
1077 // move it into its own header.
1078 
1079 // There is presently no provision for concurrent access
1080 // to breakpoint lists, which is only OK for JVMTI because
1081 // breakpoints are written only at safepoints, and are read
1082 // concurrently only outside of safepoints.
1083 
1084 class BreakpointInfo : public CHeapObj<mtClass> {
1085   friend class VMStructs;
1086  private:
1087   Bytecodes::Code  _orig_bytecode;
1088   int              _bci;
1089   u2               _name_index;       // of method
1090   u2               _signature_index;  // of method
1091   BreakpointInfo*  _next;             // simple storage allocation
1092 
1093  public:
1094   BreakpointInfo(Method* m, int bci);
1095 
1096   // accessors
1097   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1098   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1099   int         bci()                                   { return _bci; }
1100 
1101   BreakpointInfo*          next() const               { return _next; }
1102   void                 set_next(BreakpointInfo* n)    { _next = n; }
1103 
1104   // helps for searchers
1105   bool match(const Method* m, int bci) {
1106     return bci == _bci && match(m);
1107   }
1108 
1109   bool match(const Method* m) {
1110     return _name_index == m->name_index() &&
1111       _signature_index == m->signature_index();
1112   }
1113 
1114   void set(Method* method);
1115   void clear(Method* method);
1116 };
1117 
1118 #endif // INCLUDE_JVMTI
1119 
1120 // Utility class for access exception handlers
1121 class ExceptionTable : public StackObj {
1122  private:
1123   ExceptionTableElement* _table;
1124   u2  _length;
1125 
1126  public:
1127   ExceptionTable(const Method* m) {
1128     if (m->has_exception_handler()) {
1129       _table = m->exception_table_start();
1130       _length = m->exception_table_length();
1131     } else {
1132       _table = NULL;
1133       _length = 0;
1134     }
1135   }
1136 
1137   int length() const {
1138     return _length;
1139   }
1140 
1141   u2 start_pc(int idx) const {
1142     assert(idx < _length, "out of bounds");
1143     return _table[idx].start_pc;
1144   }
1145 
1146   void set_start_pc(int idx, u2 value) {
1147     assert(idx < _length, "out of bounds");
1148     _table[idx].start_pc = value;
1149   }
1150 
1151   u2 end_pc(int idx) const {
1152     assert(idx < _length, "out of bounds");
1153     return _table[idx].end_pc;
1154   }
1155 
1156   void set_end_pc(int idx, u2 value) {
1157     assert(idx < _length, "out of bounds");
1158     _table[idx].end_pc = value;
1159   }
1160 
1161   u2 handler_pc(int idx) const {
1162     assert(idx < _length, "out of bounds");
1163     return _table[idx].handler_pc;
1164   }
1165 
1166   void set_handler_pc(int idx, u2 value) {
1167     assert(idx < _length, "out of bounds");
1168     _table[idx].handler_pc = value;
1169   }
1170 
1171   u2 catch_type_index(int idx) const {
1172     assert(idx < _length, "out of bounds");
1173     return _table[idx].catch_type_index;
1174   }
1175 
1176   void set_catch_type_index(int idx, u2 value) {
1177     assert(idx < _length, "out of bounds");
1178     _table[idx].catch_type_index = value;
1179   }
1180 };
1181 
1182 #endif // SHARE_OOPS_METHOD_HPP