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   // true if method can omit stack trace in throw in compiled code.
 612   bool can_omit_stack_trace();
 613 
 614   // returns true if the method has any backward branches.
 615   bool has_loops() {
 616     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 617   };
 618 
 619   bool compute_has_loops_flag();
 620 
 621   bool has_jsrs() {
 622     return access_flags().has_jsrs();
 623   };
 624   void set_has_jsrs() {
 625     _access_flags.set_has_jsrs();
 626   }
 627 
 628   // returns true if the method has any monitors.
 629   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 630   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 631 
 632   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 633 
 634   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 635   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 636   // has not been computed yet.
 637   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 638   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 639 
 640   // returns true if the method is an accessor function (setter/getter).
 641   bool is_accessor() const;
 642 
 643   // returns true if the method is a getter
 644   bool is_getter() const;
 645 
 646   // returns true if the method is a setter
 647   bool is_setter() const;
 648 
 649   // returns true if the method does nothing but return a constant of primitive type
 650   bool is_constant_getter() const;
 651 
 652   // returns true if the method is an initializer (<init> or <clinit>).
 653   bool is_initializer() const;
 654 
 655   // returns true if the method is static OR if the classfile version < 51
 656   bool has_valid_initializer_flags() const;
 657 
 658   // returns true if the method name is <clinit> and the method has
 659   // valid static initializer flags.
 660   bool is_static_initializer() const;
 661 
 662   // returns true if the method name is <init>
 663   bool is_object_initializer() const;
 664 
 665   // compiled code support
 666   // NOTE: code() is inherently racy as deopt can be clearing code
 667   // simultaneously. Use with caution.
 668   bool has_compiled_code() const;
 669 
 670   bool needs_clinit_barrier() const;
 671 
 672   // sizing
 673   static int header_size()                       {
 674     return align_up((int)sizeof(Method), wordSize) / wordSize;
 675   }
 676   static int size(bool is_native);
 677   int size() const                               { return method_size(); }
 678   void log_touched(Thread* current);
 679   static void print_touched_methods(outputStream* out);
 680 
 681   // interpreter support
 682   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 683   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 684   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 685   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 686   static ByteSize method_data_offset()           {
 687     return byte_offset_of(Method, _method_data);
 688   }
 689   static ByteSize method_counters_offset()       {
 690     return byte_offset_of(Method, _method_counters);
 691   }
 692 #ifndef PRODUCT
 693   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 694 #endif // not PRODUCT
 695   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 696   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 697   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 698   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 699   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 700 
 701   // for code generation
 702   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 703   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 704   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 705 
 706   // Static methods that are used to implement member methods where an exposed this pointer
 707   // is needed due to possible GCs
 708   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 709 
 710   // Returns the byte code index from the byte code pointer
 711   int     bci_from(address bcp) const;
 712   address bcp_from(int bci) const;
 713   address bcp_from(address bcp) const;
 714   int validate_bci_from_bcp(address bcp) const;
 715   int validate_bci(int bci) const;
 716 
 717   // Returns the line number for a bci if debugging information for the method is prowided,
 718   // -1 is returned otherwise.
 719   int line_number_from_bci(int bci) const;
 720 
 721   // Reflection support
 722   bool is_overridden_in(Klass* k) const;
 723 
 724   // Stack walking support
 725   bool is_ignored_by_security_stack_walk() const;
 726 
 727   // JSR 292 support
 728   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 729   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 730   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 731   static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
 732                                                    Symbol* signature, //anything at all
 733                                                    TRAPS);
 734 
 735 
 736   // Continuation
 737   bool is_continuation_enter_intrinsic() const { return intrinsic_id() == vmIntrinsics::_Continuation_enterSpecial; }
 738 
 739   bool is_special_native_intrinsic() const { return is_method_handle_intrinsic() || is_continuation_enter_intrinsic(); }
 740 
 741   static Klass* check_non_bcp_klass(Klass* klass);
 742 
 743   enum {
 744     // How many extra stack entries for invokedynamic
 745     extra_stack_entries_for_jsr292 = 1
 746   };
 747 
 748   // this operates only on invoke methods:
 749   // presize interpreter frames for extra interpreter stack entries, if needed
 750   // Account for the extra appendix argument for invokehandle/invokedynamic
 751   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 752   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 753 
 754   // RedefineClasses() support:
 755   bool is_old() const                               { return access_flags().is_old(); }
 756   void set_is_old()                                 { _access_flags.set_is_old(); }
 757   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 758   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 759   bool is_deleted() const                           { return access_flags().is_deleted(); }
 760   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 761 
 762   bool on_stack() const                             { return access_flags().on_stack(); }
 763   void set_on_stack(const bool value);
 764 
 765   void record_marking_cycle();
 766 
 767   // see the definition in Method*.cpp for the gory details
 768   bool should_not_be_cached() const;
 769 
 770   // JVMTI Native method prefixing support:
 771   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 772   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 773 
 774   // Rewriting support
 775   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 776                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 777 
 778   // jmethodID handling
 779   // Because the useful life-span of a jmethodID cannot be determined,
 780   // once created they are never reclaimed.  The methods to which they refer,
 781   // however, can be GC'ed away if the class is unloaded or if the method is
 782   // made obsolete or deleted -- in these cases, the jmethodID
 783   // refers to NULL (as is the case for any weak reference).
 784   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 785   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 786 
 787   // Ensure there is enough capacity in the internal tracking data
 788   // structures to hold the number of jmethodIDs you plan to generate.
 789   // This saves substantial time doing allocations.
 790   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 791 
 792   // Use resolve_jmethod_id() in situations where the caller is expected
 793   // to provide a valid jmethodID; the only sanity checks are in asserts;
 794   // result guaranteed not to be NULL.
 795   inline static Method* resolve_jmethod_id(jmethodID mid) {
 796     assert(mid != NULL, "JNI method id should not be null");
 797     return *((Method**)mid);
 798   }
 799 
 800   // Use checked_resolve_jmethod_id() in situations where the caller
 801   // should provide a valid jmethodID, but might not. NULL is returned
 802   // when the jmethodID does not refer to a valid method.
 803   static Method* checked_resolve_jmethod_id(jmethodID mid);
 804 
 805   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 806   static bool is_method_id(jmethodID mid);
 807 
 808   // Clear methods
 809   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 810   static void print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 811 
 812   // Get this method's jmethodID -- allocate if it doesn't exist
 813   jmethodID jmethod_id();
 814 
 815   // Lookup the jmethodID for this method.  Return NULL if not found.
 816   // NOTE that this function can be called from a signal handler
 817   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 818   // needs to be async-safe. No allocation should be done and
 819   // so handles are not used to avoid deadlock.
 820   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 821 
 822   // Support for inlining of intrinsic methods
 823   vmIntrinsicID intrinsic_id() const          { return (vmIntrinsicID) _intrinsic_id;           }
 824   void     set_intrinsic_id(vmIntrinsicID id) {                           _intrinsic_id = (u2) id; }
 825 
 826   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 827   void init_intrinsic_id(vmSymbolID klass_id);     // updates from _none if a match
 828   static vmSymbolID klass_id_for_intrinsics(const Klass* holder);
 829 
 830   bool caller_sensitive() {
 831     return (_flags & _caller_sensitive) != 0;
 832   }
 833   void set_caller_sensitive(bool x) {
 834     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 835   }
 836 
 837   bool force_inline() {
 838     return (_flags & _force_inline) != 0;
 839   }
 840   void set_force_inline(bool x) {
 841     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 842   }
 843 
 844   bool dont_inline() {
 845     return (_flags & _dont_inline) != 0;
 846   }
 847   void set_dont_inline(bool x) {
 848     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 849   }
 850 
 851   bool changes_current_thread() {
 852     return (_flags & _changes_current_thread) != 0;
 853   }
 854   void set_changes_current_thread(bool x) {
 855     _flags = x ? (_flags | _changes_current_thread) : (_flags & ~_changes_current_thread);
 856   }
 857 
 858   bool jvmti_mount_transition() {
 859     return (_flags & _jvmti_mount_transition) != 0;
 860   }
 861   void set_jvmti_mount_transition(bool x) {
 862     _flags = x ? (_flags | _jvmti_mount_transition) : (_flags & ~_jvmti_mount_transition);
 863   }
 864 
 865   bool is_hidden() const {
 866     return (_flags & _hidden) != 0;
 867   }
 868 
 869   void set_hidden(bool x) {
 870     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 871   }
 872 
 873   bool is_scoped() const {
 874     return (_flags & _scoped) != 0;
 875   }
 876 
 877   void set_scoped(bool x) {
 878     _flags = x ? (_flags | _scoped) : (_flags & ~_scoped);
 879   }
 880 
 881   bool intrinsic_candidate() {
 882     return (_flags & _intrinsic_candidate) != 0;
 883   }
 884   void set_intrinsic_candidate(bool x) {
 885     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 886   }
 887 
 888   bool has_injected_profile() {
 889     return (_flags & _has_injected_profile) != 0;
 890   }
 891   void set_has_injected_profile(bool x) {
 892     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 893   }
 894 
 895   bool has_reserved_stack_access() {
 896     return (_flags & _reserved_stack_access) != 0;
 897   }
 898 
 899   void set_has_reserved_stack_access(bool x) {
 900     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 901   }
 902 
 903   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 904 
 905   ConstMethod::MethodType method_type() const {
 906       return _constMethod->method_type();
 907   }
 908   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 909 
 910   // On-stack replacement support
 911   bool has_osr_nmethod(int level, bool match_level) {
 912    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 913   }
 914 
 915   int mark_osr_nmethods() {
 916     return method_holder()->mark_osr_nmethods(this);
 917   }
 918 
 919   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 920     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 921   }
 922 
 923   // Find if klass for method is loaded
 924   bool is_klass_loaded_by_klass_index(int klass_index) const;
 925   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 926 
 927   // Indicates whether compilation failed earlier for this method, or
 928   // whether it is not compilable for another reason like having a
 929   // breakpoint set in it.
 930   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 931   void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 932   void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 933     set_not_compilable(reason, comp_level, false);
 934   }
 935   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 936   void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
 937   void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
 938     set_not_osr_compilable(reason, comp_level, false);
 939   }
 940   bool is_always_compilable() const;
 941 
 942  private:
 943   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 944 
 945  public:
 946   MethodCounters* get_method_counters(Thread* current) {
 947     if (_method_counters == NULL) {
 948       build_method_counters(current, this);
 949     }
 950     return _method_counters;
 951   }
 952 
 953   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 954   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 955   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 956   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 957   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 958   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 959 
 960   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 961   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 962   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 963   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 964   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 965   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 966 
 967   // Background compilation support
 968   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 969   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 970   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 971 
 972   // Resolve all classes in signature, return 'true' if successful
 973   static bool load_signature_classes(const methodHandle& m, TRAPS);
 974 
 975   // Return if true if not all classes references in signature, including return type, has been loaded
 976   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 977 
 978   // Printing
 979   void print_short_name(outputStream* st = tty) const; // prints as klassname::methodname; Exposed so field engineers can debug VM
 980 #if INCLUDE_JVMTI
 981   void print_name(outputStream* st = tty) const; // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
 982 #else
 983   void print_name(outputStream* st = tty) const  PRODUCT_RETURN; // prints as "virtual void foo(int)"
 984 #endif
 985 
 986   typedef int (*method_comparator_func)(Method* a, Method* b);
 987 
 988   // Helper routine used for method sorting
 989   static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = NULL);
 990 
 991   // Deallocation function for redefine classes or if an error occurs
 992   void deallocate_contents(ClassLoaderData* loader_data);
 993 
 994   void release_C_heap_structures();
 995 
 996   Method* get_new_method() const {
 997     InstanceKlass* holder = method_holder();
 998     Method* new_method = holder->method_with_idnum(orig_method_idnum());
 999 
1000     assert(new_method != NULL, "method_with_idnum() should not be NULL");
1001     assert(this != new_method, "sanity check");
1002     return new_method;
1003   }
1004 
1005   // Printing
1006 #ifndef PRODUCT
1007   void print_on(outputStream* st) const;
1008 #endif
1009   void print_value_on(outputStream* st) const;
1010   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1011 
1012   const char* internal_name() const { return "{method}"; }
1013 
1014   // Check for valid method pointer
1015   static bool has_method_vptr(const void* ptr);
1016   static bool is_valid_method(const Method* m);
1017 
1018   // Verify
1019   void verify() { verify_on(tty); }
1020   void verify_on(outputStream* st);
1021 
1022  private:
1023 
1024   // Inlined elements
1025   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1026   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1027 
1028   void set_num_stack_arg_slots();
1029 };
1030 
1031 
1032 // Utility class for compressing line number tables
1033 
1034 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1035  private:
1036   int _bci;
1037   int _line;
1038  public:
1039   // Constructor
1040   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1041   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1042 
1043   // Write (bci, line number) pair to stream
1044   void write_pair_regular(int bci_delta, int line_delta);
1045 
1046   // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1047   // we save it as one byte, otherwise we write a 0xFF escape character
1048   // and use regular compression. 0x0 is used as end-of-stream terminator.
1049   void write_pair_inline(int bci, int line);
1050 
1051   void write_pair(int bci, int line);
1052 
1053   // Write end-of-stream marker
1054   void write_terminator()                        { write_byte(0); }
1055 };
1056 
1057 
1058 // Utility class for decompressing line number tables
1059 
1060 class CompressedLineNumberReadStream: public CompressedReadStream {
1061  private:
1062   int _bci;
1063   int _line;
1064  public:
1065   // Constructor
1066   CompressedLineNumberReadStream(u_char* buffer);
1067   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1068   bool read_pair();
1069   // Accessing bci and line number (after calling read_pair)
1070   int bci() const                               { return _bci; }
1071   int line() const                              { return _line; }
1072 };
1073 
1074 
1075 #if INCLUDE_JVMTI
1076 
1077 /// Fast Breakpoints.
1078 
1079 // If this structure gets more complicated (because bpts get numerous),
1080 // move it into its own header.
1081 
1082 // There is presently no provision for concurrent access
1083 // to breakpoint lists, which is only OK for JVMTI because
1084 // breakpoints are written only at safepoints, and are read
1085 // concurrently only outside of safepoints.
1086 
1087 class BreakpointInfo : public CHeapObj<mtClass> {
1088   friend class VMStructs;
1089  private:
1090   Bytecodes::Code  _orig_bytecode;
1091   int              _bci;
1092   u2               _name_index;       // of method
1093   u2               _signature_index;  // of method
1094   BreakpointInfo*  _next;             // simple storage allocation
1095 
1096  public:
1097   BreakpointInfo(Method* m, int bci);
1098 
1099   // accessors
1100   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1101   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1102   int         bci()                                   { return _bci; }
1103 
1104   BreakpointInfo*          next() const               { return _next; }
1105   void                 set_next(BreakpointInfo* n)    { _next = n; }
1106 
1107   // helps for searchers
1108   bool match(const Method* m, int bci) {
1109     return bci == _bci && match(m);
1110   }
1111 
1112   bool match(const Method* m) {
1113     return _name_index == m->name_index() &&
1114       _signature_index == m->signature_index();
1115   }
1116 
1117   void set(Method* method);
1118   void clear(Method* method);
1119 };
1120 
1121 #endif // INCLUDE_JVMTI
1122 
1123 // Utility class for access exception handlers
1124 class ExceptionTable : public StackObj {
1125  private:
1126   ExceptionTableElement* _table;
1127   u2  _length;
1128 
1129  public:
1130   ExceptionTable(const Method* m) {
1131     if (m->has_exception_handler()) {
1132       _table = m->exception_table_start();
1133       _length = m->exception_table_length();
1134     } else {
1135       _table = NULL;
1136       _length = 0;
1137     }
1138   }
1139 
1140   int length() const {
1141     return _length;
1142   }
1143 
1144   u2 start_pc(int idx) const {
1145     assert(idx < _length, "out of bounds");
1146     return _table[idx].start_pc;
1147   }
1148 
1149   void set_start_pc(int idx, u2 value) {
1150     assert(idx < _length, "out of bounds");
1151     _table[idx].start_pc = value;
1152   }
1153 
1154   u2 end_pc(int idx) const {
1155     assert(idx < _length, "out of bounds");
1156     return _table[idx].end_pc;
1157   }
1158 
1159   void set_end_pc(int idx, u2 value) {
1160     assert(idx < _length, "out of bounds");
1161     _table[idx].end_pc = value;
1162   }
1163 
1164   u2 handler_pc(int idx) const {
1165     assert(idx < _length, "out of bounds");
1166     return _table[idx].handler_pc;
1167   }
1168 
1169   void set_handler_pc(int idx, u2 value) {
1170     assert(idx < _length, "out of bounds");
1171     _table[idx].handler_pc = value;
1172   }
1173 
1174   u2 catch_type_index(int idx) const {
1175     assert(idx < _length, "out of bounds");
1176     return _table[idx].catch_type_index;
1177   }
1178 
1179   void set_catch_type_index(int idx, u2 value) {
1180     assert(idx < _length, "out of bounds");
1181     _table[idx].catch_type_index = value;
1182   }
1183 };
1184 
1185 #endif // SHARE_OOPS_METHOD_HPP