1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
  26 #define SHARE_VM_OOPS_METHODOOP_HPP
  27 
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/compressedStream.hpp"
  30 #include "compiler/oopMap.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/growableArray.hpp"
  40 
  41 // A Method represents a Java method.
  42 //
  43 // Note that most applications load thousands of methods, so keeping the size of this
  44 // class small has a big impact on footprint.
  45 //
  46 // Note that native_function and signature_handler have to be at fixed offsets
  47 // (required by the interpreter)
  48 //
  49 //  Method embedded field layout (after declared fields):
  50 //   [EMBEDDED native_function       (present only if native) ]
  51 //   [EMBEDDED signature_handler     (present only if native) ]
  52 
  53 class CheckedExceptionElement;
  54 class LocalVariableTableElement;
  55 class AdapterHandlerEntry;
  56 class MethodData;
  57 class MethodCounters;
  58 class ConstMethod;
  59 class InlineTableSizes;
  60 class KlassSizeStats;
  61 
  62 class Method : public Metadata {
  63  friend class VMStructs;
  64  friend class JVMCIVMStructs;
  65  private:
  66   ConstMethod*      _constMethod;                // Method read-only data.
  67   MethodData*       _method_data;
  68   MethodCounters*   _method_counters;
  69   AccessFlags       _access_flags;               // Access flags
  70   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  71                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  72 #ifdef CC_INTERP
  73   int               _result_index;               // C++ interpreter needs for converting results to/from stack
  74 #endif
  75   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  76 
  77   // Flags
  78   enum Flags {
  79     _jfr_towrite           = 1 << 0,
  80     _caller_sensitive      = 1 << 1,
  81     _force_inline          = 1 << 2,
  82     _dont_inline           = 1 << 3,
  83     _hidden                = 1 << 4,
  84     _has_injected_profile  = 1 << 5,
  85     _running_emcp          = 1 << 6,
  86     _intrinsic_candidate   = 1 << 7,
  87     _reserved_stack_access = 1 << 8
  88   };
  89   mutable u2 _flags;
  90 
  91 #ifndef PRODUCT
  92   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
  93 #endif
  94   // Entry point for calling both from and to the interpreter.
  95   address _i2i_entry;           // All-args-on-stack calling convention
  96   // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
  97   AdapterHandlerEntry* _adapter;
  98   // Entry point for calling from compiled code, to compiled code if it exists
  99   // or else the interpreter.
 100   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 101   // The entry point for calling both from and to compiled code is
 102   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 103   // field can come and go.  It can transition from NULL to not-null at any
 104   // time (whenever a compile completes).  It can transition from not-null to
 105   // NULL only at safepoints (because of a de-opt).
 106   nmethod* volatile _code;                       // Points to the corresponding piece of native code
 107   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 108 
 109   // Constructor
 110   Method(ConstMethod* xconst, AccessFlags access_flags);
 111  public:
 112 
 113   static Method* allocate(ClassLoaderData* loader_data,
 114                           int byte_code_size,
 115                           AccessFlags access_flags,
 116                           InlineTableSizes* sizes,
 117                           ConstMethod::MethodType method_type,
 118                           TRAPS);
 119 
 120   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 121   Method(){}
 122 
 123   // The Method vtable is restored by this call when the Method is in the
 124   // shared archive.  See patch_klass_vtables() in metaspaceShared.cpp for
 125   // all the gory details.  SA, dtrace and pstack helpers distinguish metadata
 126   // by their vtable.
 127   void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
 128   bool is_method() const volatile { return true; }
 129 
 130   void restore_unshareable_info(TRAPS);
 131 
 132   // accessors for instance variables
 133 
 134   ConstMethod* constMethod() const             { return _constMethod; }
 135   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 136 
 137 
 138   static address make_adapters(methodHandle mh, TRAPS);
 139   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 140   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 141 
 142   // access flag
 143   AccessFlags access_flags() const               { return _access_flags;  }
 144   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 145 
 146   // name
 147   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 148   int name_index() const                         { return constMethod()->name_index();         }
 149   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 150 
 151   // signature
 152   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 153   int signature_index() const                    { return constMethod()->signature_index();         }
 154   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 155 
 156   // generics support
 157   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 158   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 159   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 160 
 161   // annotations support
 162   AnnotationArray* annotations() const           {
 163     return constMethod()->method_annotations();
 164   }
 165   AnnotationArray* parameter_annotations() const {
 166     return constMethod()->parameter_annotations();
 167   }
 168   AnnotationArray* annotation_default() const    {
 169     return constMethod()->default_annotations();
 170   }
 171   AnnotationArray* type_annotations() const      {
 172     return constMethod()->type_annotations();
 173   }
 174 
 175 #ifdef CC_INTERP
 176   void set_result_index(BasicType type);
 177   int  result_index()                            { return _result_index; }
 178 #endif
 179 
 180   // Helper routine: get klass name + "." + method name + signature as
 181   // C string, for the purpose of providing more useful NoSuchMethodErrors
 182   // and fatal error handling. The string is allocated in resource
 183   // area if a buffer is not provided by the caller.
 184   char* name_and_sig_as_C_string() const;
 185   char* name_and_sig_as_C_string(char* buf, int size) const;
 186 
 187   // Static routine in the situations we don't have a Method*
 188   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 189   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 190 
 191   Bytecodes::Code java_code_at(int bci) const {
 192     return Bytecodes::java_code_at(this, bcp_from(bci));
 193   }
 194   Bytecodes::Code code_at(int bci) const {
 195     return Bytecodes::code_at(this, bcp_from(bci));
 196   }
 197 
 198   // JVMTI breakpoints
 199   Bytecodes::Code orig_bytecode_at(int bci) const;
 200   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
 201   void set_breakpoint(int bci);
 202   void clear_breakpoint(int bci);
 203   void clear_all_breakpoints();
 204   // Tracking number of breakpoints, for fullspeed debugging.
 205   // Only mutated by VM thread.
 206   u2   number_of_breakpoints()             const {
 207     MethodCounters* mcs = method_counters();
 208     if (mcs == NULL) {
 209       return 0;
 210     } else {
 211       return mcs->number_of_breakpoints();
 212     }
 213   }
 214   void incr_number_of_breakpoints(TRAPS)         {
 215     MethodCounters* mcs = get_method_counters(CHECK);
 216     if (mcs != NULL) {
 217       mcs->incr_number_of_breakpoints();
 218     }
 219   }
 220   void decr_number_of_breakpoints(TRAPS)         {
 221     MethodCounters* mcs = get_method_counters(CHECK);
 222     if (mcs != NULL) {
 223       mcs->decr_number_of_breakpoints();
 224     }
 225   }
 226   // Initialization only
 227   void clear_number_of_breakpoints()             {
 228     MethodCounters* mcs = method_counters();
 229     if (mcs != NULL) {
 230       mcs->clear_number_of_breakpoints();
 231     }
 232   }
 233 
 234   // index into InstanceKlass methods() array
 235   // note: also used by jfr
 236   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 237   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 238 
 239   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 240   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 241 
 242   // code size
 243   int code_size() const                  { return constMethod()->code_size(); }
 244 
 245   // method size in words
 246   int method_size() const                { return sizeof(Method)/wordSize + is_native() ? 2 : 0; }
 247 
 248   // constant pool for Klass* holding this method
 249   ConstantPool* constants() const              { return constMethod()->constants(); }
 250   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 251 
 252   // max stack
 253   // return original max stack size for method verification
 254   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 255   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 256   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 257 
 258   // max locals
 259   int  max_locals() const                        { return constMethod()->max_locals(); }
 260   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 261 
 262   int highest_comp_level() const;
 263   void set_highest_comp_level(int level);
 264   int highest_osr_comp_level() const;
 265   void set_highest_osr_comp_level(int level);
 266 
 267 #if defined(COMPILER2) || INCLUDE_JVMCI
 268   // Count of times method was exited via exception while interpreting
 269   void interpreter_throwout_increment(TRAPS) {
 270     MethodCounters* mcs = get_method_counters(CHECK);
 271     if (mcs != NULL) {
 272       mcs->interpreter_throwout_increment();
 273     }
 274   }
 275 #endif
 276 
 277   int  interpreter_throwout_count() const        {
 278     MethodCounters* mcs = method_counters();
 279     if (mcs == NULL) {
 280       return 0;
 281     } else {
 282       return mcs->interpreter_throwout_count();
 283     }
 284   }
 285 
 286   // size of parameters
 287   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 288   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 289 
 290   bool has_stackmap_table() const {
 291     return constMethod()->has_stackmap_table();
 292   }
 293 
 294   Array<u1>* stackmap_data() const {
 295     return constMethod()->stackmap_data();
 296   }
 297 
 298   void set_stackmap_data(Array<u1>* sd) {
 299     constMethod()->set_stackmap_data(sd);
 300   }
 301 
 302   // exception handler table
 303   bool has_exception_handler() const
 304                              { return constMethod()->has_exception_handler(); }
 305   int exception_table_length() const
 306                              { return constMethod()->exception_table_length(); }
 307   ExceptionTableElement* exception_table_start() const
 308                              { return constMethod()->exception_table_start(); }
 309 
 310   // Finds the first entry point bci of an exception handler for an
 311   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 312   // for ex_klass indicates that the exception klass is not known; in
 313   // this case it matches any constraint class. Returns -1 if the
 314   // exception cannot be handled in this method. The handler
 315   // constraint classes are loaded if necessary. Note that this may
 316   // throw an exception if loading of the constraint classes causes
 317   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 318   // If an exception is thrown, returns the bci of the
 319   // exception handler which caused the exception to be thrown, which
 320   // is needed for proper retries. See, for example,
 321   // InterpreterRuntime::exception_handler_for_exception.
 322   static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
 323 
 324   // method data access
 325   MethodData* method_data() const              {
 326     return _method_data;
 327   }
 328 
 329   void set_method_data(MethodData* data)       {
 330     // The store into method must be released. On platforms without
 331     // total store order (TSO) the reference may become visible before
 332     // the initialization of data otherwise.
 333     OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
 334   }
 335 
 336   MethodCounters* method_counters() const {
 337     return _method_counters;
 338   }
 339 
 340   void clear_method_counters() {
 341     _method_counters = NULL;
 342   }
 343 
 344   bool init_method_counters(MethodCounters* counters) {
 345     // Try to install a pointer to MethodCounters, return true on success.
 346     return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
 347   }
 348 
 349 #ifdef TIERED
 350   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 351   // We can do that since interpreter_invocation_count is not used in tiered.
 352   int prev_event_count() const                   {
 353     if (method_counters() == NULL) {
 354       return 0;
 355     } else {
 356       return method_counters()->interpreter_invocation_count();
 357     }
 358   }
 359   void set_prev_event_count(int count) {
 360     MethodCounters* mcs = method_counters();
 361     if (mcs != NULL) {
 362       mcs->set_interpreter_invocation_count(count);
 363     }
 364   }
 365   jlong prev_time() const                        {
 366     MethodCounters* mcs = method_counters();
 367     return mcs == NULL ? 0 : mcs->prev_time();
 368   }
 369   void set_prev_time(jlong time) {
 370     MethodCounters* mcs = method_counters();
 371     if (mcs != NULL) {
 372       mcs->set_prev_time(time);
 373     }
 374   }
 375   float rate() const                             {
 376     MethodCounters* mcs = method_counters();
 377     return mcs == NULL ? 0 : mcs->rate();
 378   }
 379   void set_rate(float rate) {
 380     MethodCounters* mcs = method_counters();
 381     if (mcs != NULL) {
 382       mcs->set_rate(rate);
 383     }
 384   }
 385 #endif
 386   int nmethod_age() const {
 387     if (method_counters() == NULL) {
 388       return INT_MAX;
 389     } else {
 390       return method_counters()->nmethod_age();
 391     }
 392   }
 393 
 394   int invocation_count();
 395   int backedge_count();
 396 
 397   bool was_executed_more_than(int n);
 398   bool was_never_executed()                      { return !was_executed_more_than(0); }
 399 
 400   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 401 
 402   static MethodCounters* build_method_counters(Method* m, TRAPS);
 403 
 404   int interpreter_invocation_count() {
 405     if (TieredCompilation) {
 406       return invocation_count();
 407     } else {
 408       MethodCounters* mcs = method_counters();
 409       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 410     }
 411   }
 412 #if defined(COMPILER2) || INCLUDE_JVMCI
 413   int increment_interpreter_invocation_count(TRAPS) {
 414     if (TieredCompilation) ShouldNotReachHere();
 415     MethodCounters* mcs = get_method_counters(CHECK_0);
 416     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 417   }
 418 #endif
 419 
 420 #ifndef PRODUCT
 421   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 422   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 423 #else
 424   // for PrintMethodData in a product build
 425   int  compiled_invocation_count() const         { return 0;  }
 426 #endif // not PRODUCT
 427 
 428   // Clear (non-shared space) pointers which could not be relevant
 429   // if this (shared) method were mapped into another JVM.
 430   void remove_unshareable_info();
 431 
 432   // nmethod/verified compiler entry
 433   address verified_code_entry();
 434   bool check_code() const;      // Not inline to avoid circular ref
 435   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
 436   void clear_code();            // Clear out any compiled code
 437   static void set_code(methodHandle mh, nmethod* code);
 438   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
 439   address get_i2c_entry();
 440   address get_c2i_entry();
 441   address get_c2i_unverified_entry();
 442   AdapterHandlerEntry* adapter() {  return _adapter; }
 443   // setup entry points
 444   void link_method(const methodHandle& method, TRAPS);
 445   // clear entry points. Used by sharing code
 446   void unlink_method();
 447 
 448   // vtable index
 449   enum VtableIndexFlag {
 450     // Valid vtable indexes are non-negative (>= 0).
 451     // These few negative values are used as sentinels.
 452     itable_index_max        = -10, // first itable index, growing downward
 453     pending_itable_index    = -9,  // itable index will be assigned
 454     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 455     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 456     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 457     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 458   };
 459   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 460   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 461   int  vtable_index() const                      { return _vtable_index; }
 462   void set_vtable_index(int index)               { _vtable_index = index; }
 463   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 464   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 465   int  itable_index() const                      { assert(valid_itable_index(), "");
 466                                                    return itable_index_max - _vtable_index; }
 467   void set_itable_index(int index)               { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); }
 468 
 469   // interpreter entry
 470   address interpreter_entry() const              { return _i2i_entry; }
 471   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 472   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
 473 
 474   // native function (used for native methods only)
 475   enum {
 476     native_bind_event_is_interesting = true
 477   };
 478   address native_function() const                { return *(native_function_addr()); }
 479   address critical_native_function();
 480 
 481   // Must specify a real function (not NULL).
 482   // Use clear_native_function() to unregister.
 483   void set_native_function(address function, bool post_event_flag);
 484   bool has_native_function() const;
 485   void clear_native_function();
 486 
 487   // signature handler (used for native methods only)
 488   address signature_handler() const              { return *(signature_handler_addr()); }
 489   void set_signature_handler(address handler);
 490 
 491   // Interpreter oopmap support
 492   void mask_for(int bci, InterpreterOopMap* mask);
 493 
 494   // operations on invocation counter
 495   void print_invocation_count();
 496 
 497   // byte codes
 498   void    set_code(address code)      { return constMethod()->set_code(code); }
 499   address code_base() const           { return constMethod()->code_base(); }
 500   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 501 
 502   // prints byte codes
 503   void print_codes() const            { print_codes_on(tty); }
 504   void print_codes_on(outputStream* st) const;
 505   void print_codes_on(int from, int to, outputStream* st) const;
 506 
 507   // method parameters
 508   bool has_method_parameters() const
 509                          { return constMethod()->has_method_parameters(); }
 510   int method_parameters_length() const
 511                          { return constMethod()->method_parameters_length(); }
 512   MethodParametersElement* method_parameters_start() const
 513                           { return constMethod()->method_parameters_start(); }
 514 
 515   // checked exceptions
 516   int checked_exceptions_length() const
 517                          { return constMethod()->checked_exceptions_length(); }
 518   CheckedExceptionElement* checked_exceptions_start() const
 519                           { return constMethod()->checked_exceptions_start(); }
 520 
 521   // localvariable table
 522   bool has_localvariable_table() const
 523                           { return constMethod()->has_localvariable_table(); }
 524   int localvariable_table_length() const
 525                         { return constMethod()->localvariable_table_length(); }
 526   LocalVariableTableElement* localvariable_table_start() const
 527                          { return constMethod()->localvariable_table_start(); }
 528 
 529   bool has_linenumber_table() const
 530                               { return constMethod()->has_linenumber_table(); }
 531   u_char* compressed_linenumber_table() const
 532                        { return constMethod()->compressed_linenumber_table(); }
 533 
 534   // method holder (the Klass* holding this method)
 535   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 536 
 537   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 538   Symbol* klass_name() const;                    // returns the name of the method holder
 539   BasicType result_type() const;                 // type of the method result
 540   int result_type_index() const;                 // type index of the method result
 541   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 542   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 543 
 544   // Checked exceptions thrown by this method (resolved to mirrors)
 545   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 546 
 547   // Access flags
 548   bool is_public() const                         { return access_flags().is_public();      }
 549   bool is_private() const                        { return access_flags().is_private();     }
 550   bool is_protected() const                      { return access_flags().is_protected();   }
 551   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 552   bool is_static() const                         { return access_flags().is_static();      }
 553   bool is_final() const                          { return access_flags().is_final();       }
 554   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 555   bool is_native() const                         { return access_flags().is_native();      }
 556   bool is_abstract() const                       { return access_flags().is_abstract();    }
 557   bool is_strict() const                         { return access_flags().is_strict();      }
 558   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 559 
 560   // returns true if contains only return operation
 561   bool is_empty_method() const;
 562 
 563   // returns true if this is a vanilla constructor
 564   bool is_vanilla_constructor() const;
 565 
 566   // checks method and its method holder
 567   bool is_final_method() const;
 568   bool is_final_method(AccessFlags class_access_flags) const;
 569   bool is_default_method() const;
 570 
 571   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 572   bool can_be_statically_bound() const;
 573   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 574 
 575   // returns true if the method has any backward branches.
 576   bool has_loops() {
 577     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 578   };
 579 
 580   bool compute_has_loops_flag();
 581 
 582   bool has_jsrs() {
 583     return access_flags().has_jsrs();
 584   };
 585   void set_has_jsrs() {
 586     _access_flags.set_has_jsrs();
 587   }
 588 
 589   // returns true if the method has any monitors.
 590   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 591   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 592 
 593   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 594 
 595   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 596   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 597   // has not been computed yet.
 598   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 599   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 600 
 601   // returns true if the method is an accessor function (setter/getter).
 602   bool is_accessor() const;
 603 
 604   // returns true if the method is a getter
 605   bool is_getter() const;
 606 
 607   // returns true if the method is a setter
 608   bool is_setter() const;
 609 
 610   // returns true if the method does nothing but return a constant of primitive type
 611   bool is_constant_getter() const;
 612 
 613   // returns true if the method is an initializer (<init> or <clinit>).
 614   bool is_initializer() const;
 615 
 616   // returns true if the method is static OR if the classfile version < 51
 617   bool has_valid_initializer_flags() const;
 618 
 619   // returns true if the method name is <clinit> and the method has
 620   // valid static initializer flags.
 621   bool is_static_initializer() const;
 622 
 623   // compiled code support
 624   // NOTE: code() is inherently racy as deopt can be clearing code
 625   // simultaneously. Use with caution.
 626   bool has_compiled_code() const                 { return code() != NULL; }
 627 
 628   // sizing
 629   static int header_size()                       { return sizeof(Method)/wordSize; }
 630   static int size(bool is_native);
 631   int size() const                               { return method_size(); }
 632 #if INCLUDE_SERVICES
 633   void collect_statistics(KlassSizeStats *sz) const;
 634 #endif
 635   void log_touched(TRAPS);
 636   static void print_touched_methods(outputStream* out);
 637 
 638   // interpreter support
 639   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 640   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 641 #ifdef CC_INTERP
 642   static ByteSize result_index_offset()          { return byte_offset_of(Method, _result_index ); }
 643 #endif /* CC_INTERP */
 644   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 645   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 646   static ByteSize method_data_offset()           {
 647     return byte_offset_of(Method, _method_data);
 648   }
 649   static ByteSize method_counters_offset()       {
 650     return byte_offset_of(Method, _method_counters);
 651   }
 652 #ifndef PRODUCT
 653   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 654 #endif // not PRODUCT
 655   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 656   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 657   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 658   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 659 
 660   // for code generation
 661   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 662   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 663   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 664 
 665   // Static methods that are used to implement member methods where an exposed this pointer
 666   // is needed due to possible GCs
 667   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 668 
 669   // Returns the byte code index from the byte code pointer
 670   int     bci_from(address bcp) const;
 671   address bcp_from(int bci) const;
 672   address bcp_from(address bcp) const;
 673   int validate_bci_from_bcp(address bcp) const;
 674   int validate_bci(int bci) const;
 675 
 676   // Returns the line number for a bci if debugging information for the method is prowided,
 677   // -1 is returned otherwise.
 678   int line_number_from_bci(int bci) const;
 679 
 680   // Reflection support
 681   bool is_overridden_in(Klass* k) const;
 682 
 683   // Stack walking support
 684   bool is_ignored_by_security_stack_walk() const;
 685 
 686   // JSR 292 support
 687   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 688   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 689   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 690   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 691                                                    Symbol* signature, //anything at all
 692                                                    TRAPS);
 693   static Klass* check_non_bcp_klass(Klass* klass);
 694 
 695   enum {
 696     // How many extra stack entries for invokedynamic
 697     extra_stack_entries_for_jsr292 = 1
 698   };
 699 
 700   // this operates only on invoke methods:
 701   // presize interpreter frames for extra interpreter stack entries, if needed
 702   // Account for the extra appendix argument for invokehandle/invokedynamic
 703   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 704   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 705 
 706   // RedefineClasses() support:
 707   bool is_old() const                               { return access_flags().is_old(); }
 708   void set_is_old()                                 { _access_flags.set_is_old(); }
 709   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 710   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 711   bool is_deleted() const                           { return access_flags().is_deleted(); }
 712   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 713 
 714   bool is_running_emcp() const {
 715     // EMCP methods are old but not obsolete or deleted. Equivalent
 716     // Modulo Constant Pool means the method is equivalent except
 717     // the constant pool and instructions that access the constant
 718     // pool might be different.
 719     // If a breakpoint is set in a redefined method, its EMCP methods that are
 720     // still running must have a breakpoint also.
 721     return (_flags & _running_emcp) != 0;
 722   }
 723 
 724   void set_running_emcp(bool x) {
 725     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 726   }
 727 
 728   bool on_stack() const                             { return access_flags().on_stack(); }
 729   void set_on_stack(const bool value);
 730 
 731   // see the definition in Method*.cpp for the gory details
 732   bool should_not_be_cached() const;
 733 
 734   // JVMTI Native method prefixing support:
 735   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 736   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 737 
 738   // Rewriting support
 739   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 740                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 741 
 742   // jmethodID handling
 743   // Because the useful life-span of a jmethodID cannot be determined,
 744   // once created they are never reclaimed.  The methods to which they refer,
 745   // however, can be GC'ed away if the class is unloaded or if the method is
 746   // made obsolete or deleted -- in these cases, the jmethodID
 747   // refers to NULL (as is the case for any weak reference).
 748   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 749   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 750 
 751   // Ensure there is enough capacity in the internal tracking data
 752   // structures to hold the number of jmethodIDs you plan to generate.
 753   // This saves substantial time doing allocations.
 754   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 755 
 756   // Use resolve_jmethod_id() in situations where the caller is expected
 757   // to provide a valid jmethodID; the only sanity checks are in asserts;
 758   // result guaranteed not to be NULL.
 759   inline static Method* resolve_jmethod_id(jmethodID mid) {
 760     assert(mid != NULL, "JNI method id should not be null");
 761     return *((Method**)mid);
 762   }
 763 
 764   // Use checked_resolve_jmethod_id() in situations where the caller
 765   // should provide a valid jmethodID, but might not. NULL is returned
 766   // when the jmethodID does not refer to a valid method.
 767   static Method* checked_resolve_jmethod_id(jmethodID mid);
 768 
 769   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 770   static bool is_method_id(jmethodID mid);
 771 
 772   // Clear methods
 773   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 774   static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 775 
 776   // Get this method's jmethodID -- allocate if it doesn't exist
 777   jmethodID jmethod_id()                            { methodHandle this_h(this);
 778                                                       return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
 779 
 780   // Lookup the jmethodID for this method.  Return NULL if not found.
 781   // NOTE that this function can be called from a signal handler
 782   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 783   // needs to be async-safe. No allocation should be done and
 784   // so handles are not used to avoid deadlock.
 785   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 786 
 787   // Support for inlining of intrinsic methods
 788   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 789   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 790 
 791   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 792   void init_intrinsic_id();     // updates from _none if a match
 793   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 794 
 795   bool jfr_towrite() const {
 796     return (_flags & _jfr_towrite) != 0;
 797   }
 798   void set_jfr_towrite(bool x) const {
 799     _flags = x ? (_flags | _jfr_towrite) : (_flags & ~_jfr_towrite);
 800   }
 801 
 802   bool caller_sensitive() {
 803     return (_flags & _caller_sensitive) != 0;
 804   }
 805   void set_caller_sensitive(bool x) {
 806     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 807   }
 808 
 809   bool force_inline() {
 810     return (_flags & _force_inline) != 0;
 811   }
 812   void set_force_inline(bool x) {
 813     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 814   }
 815 
 816   bool dont_inline() {
 817     return (_flags & _dont_inline) != 0;
 818   }
 819   void set_dont_inline(bool x) {
 820     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 821   }
 822 
 823   bool is_hidden() {
 824     return (_flags & _hidden) != 0;
 825   }
 826   void set_hidden(bool x) {
 827     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 828   }
 829 
 830   bool intrinsic_candidate() {
 831     return (_flags & _intrinsic_candidate) != 0;
 832   }
 833   void set_intrinsic_candidate(bool x) {
 834     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 835   }
 836 
 837   bool has_injected_profile() {
 838     return (_flags & _has_injected_profile) != 0;
 839   }
 840   void set_has_injected_profile(bool x) {
 841     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 842   }
 843 
 844   bool has_reserved_stack_access() {
 845     return (_flags & _reserved_stack_access) != 0;
 846   }
 847 
 848   void set_has_reserved_stack_access(bool x) {
 849     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 850   }
 851 
 852   ConstMethod::MethodType method_type() const {
 853       return _constMethod->method_type();
 854   }
 855   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 856 
 857   // On-stack replacement support
 858   bool has_osr_nmethod(int level, bool match_level) {
 859    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 860   }
 861 
 862   int mark_osr_nmethods() {
 863     return method_holder()->mark_osr_nmethods(this);
 864   }
 865 
 866   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 867     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 868   }
 869 
 870   // Inline cache support
 871   void cleanup_inline_caches();
 872 
 873   // Find if klass for method is loaded
 874   bool is_klass_loaded_by_klass_index(int klass_index) const;
 875   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 876 
 877   // Indicates whether compilation failed earlier for this method, or
 878   // whether it is not compilable for another reason like having a
 879   // breakpoint set in it.
 880   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 881   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 882   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 883     set_not_compilable(comp_level, false);
 884   }
 885   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 886   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 887   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 888     set_not_osr_compilable(comp_level, false);
 889   }
 890   bool is_always_compilable() const;
 891 
 892  private:
 893   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 894 
 895  public:
 896   MethodCounters* get_method_counters(TRAPS) {
 897     if (_method_counters == NULL) {
 898       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 899     }
 900     return _method_counters;
 901   }
 902 
 903   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 904   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 905   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 906   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 907   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 908   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 909 
 910   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 911   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 912   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 913   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 914   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 915   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 916 
 917   // Background compilation support
 918   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 919   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 920   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 921 
 922   // Resolve all classes in signature, return 'true' if successful
 923   static bool load_signature_classes(methodHandle m, TRAPS);
 924 
 925   // Return if true if not all classes references in signature, including return type, has been loaded
 926   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 927 
 928   // Printing
 929   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 930 #if INCLUDE_JVMTI
 931   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 932 #else
 933   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 934 #endif
 935 
 936   // Helper routine used for method sorting
 937   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 938 
 939   // Deallocation function for redefine classes or if an error occurs
 940   void deallocate_contents(ClassLoaderData* loader_data);
 941 
 942   // Printing
 943 #ifndef PRODUCT
 944   void print_on(outputStream* st) const;
 945 #endif
 946   void print_value_on(outputStream* st) const;
 947   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
 948 
 949   const char* internal_name() const { return "{method}"; }
 950 
 951   // Check for valid method pointer
 952   static bool has_method_vptr(const void* ptr);
 953   bool is_valid_method() const;
 954 
 955   // Verify
 956   void verify() { verify_on(tty); }
 957   void verify_on(outputStream* st);
 958 
 959  private:
 960 
 961   // Inlined elements
 962   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 963   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 964 };
 965 
 966 
 967 // Utility class for compressing line number tables
 968 
 969 class CompressedLineNumberWriteStream: public CompressedWriteStream {
 970  private:
 971   int _bci;
 972   int _line;
 973  public:
 974   // Constructor
 975   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
 976   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
 977 
 978   // Write (bci, line number) pair to stream
 979   void write_pair_regular(int bci_delta, int line_delta);
 980 
 981   inline void write_pair_inline(int bci, int line) {
 982     int bci_delta = bci - _bci;
 983     int line_delta = line - _line;
 984     _bci = bci;
 985     _line = line;
 986     // Skip (0,0) deltas - they do not add information and conflict with terminator.
 987     if (bci_delta == 0 && line_delta == 0) return;
 988     // Check if bci is 5-bit and line number 3-bit unsigned.
 989     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 990       // Compress into single byte.
 991       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 992       // Check that value doesn't match escape character.
 993       if (value != 0xFF) {
 994         write_byte(value);
 995         return;
 996       }
 997     }
 998     write_pair_regular(bci_delta, line_delta);
 999   }
1000 
1001 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1002 // Disabling optimization doesn't work for methods in header files
1003 // so we force it to call through the non-optimized version in the .cpp.
1004 // It's gross, but it's the only way we can ensure that all callers are
1005 // fixed.  _MSC_VER is defined by the windows compiler
1006 #if defined(_M_AMD64) && _MSC_VER >= 1400
1007   void write_pair(int bci, int line);
1008 #else
1009   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1010 #endif
1011 
1012   // Write end-of-stream marker
1013   void write_terminator()                        { write_byte(0); }
1014 };
1015 
1016 
1017 // Utility class for decompressing line number tables
1018 
1019 class CompressedLineNumberReadStream: public CompressedReadStream {
1020  private:
1021   int _bci;
1022   int _line;
1023  public:
1024   // Constructor
1025   CompressedLineNumberReadStream(u_char* buffer);
1026   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1027   bool read_pair();
1028   // Accessing bci and line number (after calling read_pair)
1029   int bci() const                               { return _bci; }
1030   int line() const                              { return _line; }
1031 };
1032 
1033 
1034 /// Fast Breakpoints.
1035 
1036 // If this structure gets more complicated (because bpts get numerous),
1037 // move it into its own header.
1038 
1039 // There is presently no provision for concurrent access
1040 // to breakpoint lists, which is only OK for JVMTI because
1041 // breakpoints are written only at safepoints, and are read
1042 // concurrently only outside of safepoints.
1043 
1044 class BreakpointInfo : public CHeapObj<mtClass> {
1045   friend class VMStructs;
1046  private:
1047   Bytecodes::Code  _orig_bytecode;
1048   int              _bci;
1049   u2               _name_index;       // of method
1050   u2               _signature_index;  // of method
1051   BreakpointInfo*  _next;             // simple storage allocation
1052 
1053  public:
1054   BreakpointInfo(Method* m, int bci);
1055 
1056   // accessors
1057   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1058   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1059   int         bci()                                   { return _bci; }
1060 
1061   BreakpointInfo*          next() const               { return _next; }
1062   void                 set_next(BreakpointInfo* n)    { _next = n; }
1063 
1064   // helps for searchers
1065   bool match(const Method* m, int bci) {
1066     return bci == _bci && match(m);
1067   }
1068 
1069   bool match(const Method* m) {
1070     return _name_index == m->name_index() &&
1071       _signature_index == m->signature_index();
1072   }
1073 
1074   void set(Method* method);
1075   void clear(Method* method);
1076 };
1077 
1078 // Utility class for access exception handlers
1079 class ExceptionTable : public StackObj {
1080  private:
1081   ExceptionTableElement* _table;
1082   u2  _length;
1083 
1084  public:
1085   ExceptionTable(const Method* m) {
1086     if (m->has_exception_handler()) {
1087       _table = m->exception_table_start();
1088       _length = m->exception_table_length();
1089     } else {
1090       _table = NULL;
1091       _length = 0;
1092     }
1093   }
1094 
1095   int length() const {
1096     return _length;
1097   }
1098 
1099   u2 start_pc(int idx) const {
1100     assert(idx < _length, "out of bounds");
1101     return _table[idx].start_pc;
1102   }
1103 
1104   void set_start_pc(int idx, u2 value) {
1105     assert(idx < _length, "out of bounds");
1106     _table[idx].start_pc = value;
1107   }
1108 
1109   u2 end_pc(int idx) const {
1110     assert(idx < _length, "out of bounds");
1111     return _table[idx].end_pc;
1112   }
1113 
1114   void set_end_pc(int idx, u2 value) {
1115     assert(idx < _length, "out of bounds");
1116     _table[idx].end_pc = value;
1117   }
1118 
1119   u2 handler_pc(int idx) const {
1120     assert(idx < _length, "out of bounds");
1121     return _table[idx].handler_pc;
1122   }
1123 
1124   void set_handler_pc(int idx, u2 value) {
1125     assert(idx < _length, "out of bounds");
1126     _table[idx].handler_pc = value;
1127   }
1128 
1129   u2 catch_type_index(int idx) const {
1130     assert(idx < _length, "out of bounds");
1131     return _table[idx].catch_type_index;
1132   }
1133 
1134   void set_catch_type_index(int idx, u2 value) {
1135     assert(idx < _length, "out of bounds");
1136     _table[idx].catch_type_index = value;
1137   }
1138 };
1139 
1140 #endif // SHARE_VM_OOPS_METHODOOP_HPP