1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
  26 #define SHARE_VM_OOPS_METHODOOP_HPP
  27 
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/compressedStream.hpp"
  30 #include "compiler/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 #include "utilities/macros.hpp"
  41 #if INCLUDE_JFR
  42 #include "jfr/support/jfrTraceIdExtension.hpp"
  43 #endif
  44 
  45 // A Method* represents a Java method.
  46 //
  47 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
  48 // so keeping the size of this structure small has a big impact on footprint.
  49 //
  50 // We put all oops and method_size first for better gc cache locality.
  51 //
  52 // The actual bytecodes are inlined after the end of the Method struct.
  53 //
  54 // There are bits in the access_flags telling whether inlined tables are present.
  55 // Note that accessing the line number and local variable tables is not performance critical at all.
  56 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
  57 // to it fast.
  58 //
  59 // The line number table is compressed and inlined following the byte codes. It is found as the first
  60 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
  61 // after the line number table, and indexed from the end of the method. We do not compress the checked
  62 // exceptions table since the average length is less than 2, and do not bother to compress the local
  63 // variable table either since it is mostly absent.
  64 //
  65 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
  66 //
  67 // |------------------------------------------------------|
  68 // | header                                               |
  69 // | klass                                                |
  70 // |------------------------------------------------------|
  71 // | ConstMethod*                   (oop)                 |
  72 // |------------------------------------------------------|
  73 // | methodData                     (oop)                 |
  74 // | methodCounters                                       |
  75 // |------------------------------------------------------|
  76 // | access_flags                                         |
  77 // | vtable_index                                         |
  78 // |------------------------------------------------------|
  79 // | result_index (C++ interpreter only)                  |
  80 // |------------------------------------------------------|
  81 // | method_size             |   intrinsic_id|   flags    |
  82 // |------------------------------------------------------|
  83 // | code                           (pointer)             |
  84 // | i2i                            (pointer)             |
  85 // | adapter                        (pointer)             |
  86 // | from_compiled_entry            (pointer)             |
  87 // | from_interpreted_entry         (pointer)             |
  88 // |------------------------------------------------------|
  89 // | native_function       (present only if native)       |
  90 // | signature_handler     (present only if native)       |
  91 // |------------------------------------------------------|
  92 
  93 
  94 class CheckedExceptionElement;
  95 class LocalVariableTableElement;
  96 class AdapterHandlerEntry;
  97 class MethodData;
  98 class MethodCounters;
  99 class ConstMethod;
 100 class InlineTableSizes;
 101 class KlassSizeStats;
 102 
 103 class Method : public Metadata {
 104  friend class VMStructs;
 105  private:
 106   ConstMethod*      _constMethod;                // Method read-only data.
 107   MethodData*       _method_data;
 108   MethodCounters*   _method_counters;
 109   AccessFlags       _access_flags;               // Access flags
 110   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
 111                                                  // note: can have vtables with >2**16 elements (because of inheritance)
 112   u2                _method_size;                // size of this object
 113   u1                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
 114   u1                _jfr_towrite          : 1,   // Flags
 115                     _caller_sensitive     : 1,
 116                     _force_inline         : 1,
 117                     _hidden               : 1,
 118                     _running_emcp         : 1,
 119                     _dont_inline          : 1,
 120                     _has_injected_profile : 1,
 121                                           : 2;
 122 
 123   JFR_ONLY(DEFINE_TRACE_FLAG;)
 124 
 125 #ifndef PRODUCT
 126   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 127 #endif
 128   // Entry point for calling both from and to the interpreter.
 129   address _i2i_entry;           // All-args-on-stack calling convention
 130   // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
 131   AdapterHandlerEntry* _adapter;
 132   // Entry point for calling from compiled code, to compiled code if it exists
 133   // or else the interpreter.
 134   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 135   // The entry point for calling both from and to compiled code is
 136   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 137   // field can come and go.  It can transition from NULL to not-null at any
 138   // time (whenever a compile completes).  It can transition from not-null to
 139   // NULL only at safepoints (because of a de-opt).
 140   nmethod* volatile _code;                       // Points to the corresponding piece of native code
 141   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 142 
 143   // Constructor
 144   Method(ConstMethod* xconst, AccessFlags access_flags, int size);
 145  public:
 146 
 147   static Method* allocate(ClassLoaderData* loader_data,
 148                           int byte_code_size,
 149                           AccessFlags access_flags,
 150                           InlineTableSizes* sizes,
 151                           ConstMethod::MethodType method_type,
 152                           TRAPS);
 153 
 154   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 155   Method(){}
 156 
 157   // The Method vtable is restored by this call when the Method is in the
 158   // shared archive.  See patch_klass_vtables() in metaspaceShared.cpp for
 159   // all the gory details.  SA, dtrace and pstack helpers distinguish metadata
 160   // by their vtable.
 161   void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
 162   bool is_method() const volatile { return true; }
 163 
 164   void restore_unshareable_info(TRAPS);
 165 
 166   // accessors for instance variables
 167 
 168   ConstMethod* constMethod() const             { return _constMethod; }
 169   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 170 
 171 
 172   static address make_adapters(methodHandle mh, TRAPS);
 173   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 174   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 175 
 176   // access flag
 177   AccessFlags access_flags() const               { return _access_flags;  }
 178   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 179 
 180   // name
 181   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 182   int name_index() const                         { return constMethod()->name_index();         }
 183   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 184 
 185   // signature
 186   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 187   int signature_index() const                    { return constMethod()->signature_index();         }
 188   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 189 
 190   // generics support
 191   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 192   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 193   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 194 
 195   // annotations support
 196   AnnotationArray* annotations() const           {
 197     return constMethod()->method_annotations();
 198   }
 199   AnnotationArray* parameter_annotations() const {
 200     return constMethod()->parameter_annotations();
 201   }
 202   AnnotationArray* annotation_default() const    {
 203     return constMethod()->default_annotations();
 204   }
 205   AnnotationArray* type_annotations() const      {
 206     return constMethod()->type_annotations();
 207   }
 208 
 209   // Helper routine: get klass name + "." + method name + signature as
 210   // C string, for the purpose of providing more useful NoSuchMethodErrors
 211   // and fatal error handling. The string is allocated in resource
 212   // area if a buffer is not provided by the caller.
 213   char* name_and_sig_as_C_string() const;
 214   char* name_and_sig_as_C_string(char* buf, int size) const;
 215 
 216   // Static routine in the situations we don't have a Method*
 217   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 218   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 219 
 220   Bytecodes::Code java_code_at(int bci) const {
 221     return Bytecodes::java_code_at(this, bcp_from(bci));
 222   }
 223   Bytecodes::Code code_at(int bci) const {
 224     return Bytecodes::code_at(this, bcp_from(bci));
 225   }
 226 
 227   // JVMTI breakpoints
 228   Bytecodes::Code orig_bytecode_at(int bci) const;
 229   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
 230   void set_breakpoint(int bci);
 231   void clear_breakpoint(int bci);
 232   void clear_all_breakpoints();
 233   // Tracking number of breakpoints, for fullspeed debugging.
 234   // Only mutated by VM thread.
 235   u2   number_of_breakpoints()             const {
 236     MethodCounters* mcs = method_counters();
 237     if (mcs == NULL) {
 238       return 0;
 239     } else {
 240       return mcs->number_of_breakpoints();
 241     }
 242   }
 243   void incr_number_of_breakpoints(TRAPS)         {
 244     MethodCounters* mcs = get_method_counters(CHECK);
 245     if (mcs != NULL) {
 246       mcs->incr_number_of_breakpoints();
 247     }
 248   }
 249   void decr_number_of_breakpoints(TRAPS)         {
 250     MethodCounters* mcs = get_method_counters(CHECK);
 251     if (mcs != NULL) {
 252       mcs->decr_number_of_breakpoints();
 253     }
 254   }
 255   // Initialization only
 256   void clear_number_of_breakpoints()             {
 257     MethodCounters* mcs = method_counters();
 258     if (mcs != NULL) {
 259       mcs->clear_number_of_breakpoints();
 260     }
 261   }
 262 
 263   // index into InstanceKlass methods() array
 264   // note: also used by jfr
 265   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 266   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 267 
 268   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 269   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 270 
 271   // code size
 272   int code_size() const                  { return constMethod()->code_size(); }
 273 
 274   // method size
 275   int method_size() const                        { return _method_size; }
 276   void set_method_size(int size) {
 277     assert(0 <= size && size < (1 << 16), "invalid method size");
 278     _method_size = size;
 279   }
 280 
 281   // constant pool for Klass* holding this method
 282   ConstantPool* constants() const              { return constMethod()->constants(); }
 283   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 284 
 285   // max stack
 286   // return original max stack size for method verification
 287   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 288   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 289   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 290 
 291   // max locals
 292   int  max_locals() const                        { return constMethod()->max_locals(); }
 293   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 294 
 295   int highest_comp_level() const;
 296   void set_highest_comp_level(int level);
 297   int highest_osr_comp_level() const;
 298   void set_highest_osr_comp_level(int level);
 299 
 300   // Count of times method was exited via exception while interpreting
 301   void interpreter_throwout_increment(TRAPS) {
 302     MethodCounters* mcs = get_method_counters(CHECK);
 303     if (mcs != NULL) {
 304       mcs->interpreter_throwout_increment();
 305     }
 306   }
 307 
 308   int  interpreter_throwout_count() const        {
 309     MethodCounters* mcs = method_counters();
 310     if (mcs == NULL) {
 311       return 0;
 312     } else {
 313       return mcs->interpreter_throwout_count();
 314     }
 315   }
 316 
 317   // size of parameters
 318   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 319   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 320 
 321   bool has_stackmap_table() const {
 322     return constMethod()->has_stackmap_table();
 323   }
 324 
 325   Array<u1>* stackmap_data() const {
 326     return constMethod()->stackmap_data();
 327   }
 328 
 329   void set_stackmap_data(Array<u1>* sd) {
 330     constMethod()->set_stackmap_data(sd);
 331   }
 332 
 333   // exception handler table
 334   bool has_exception_handler() const
 335                              { return constMethod()->has_exception_handler(); }
 336   int exception_table_length() const
 337                              { return constMethod()->exception_table_length(); }
 338   ExceptionTableElement* exception_table_start() const
 339                              { return constMethod()->exception_table_start(); }
 340 
 341   // Finds the first entry point bci of an exception handler for an
 342   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 343   // for ex_klass indicates that the exception klass is not known; in
 344   // this case it matches any constraint class. Returns -1 if the
 345   // exception cannot be handled in this method. The handler
 346   // constraint classes are loaded if necessary. Note that this may
 347   // throw an exception if loading of the constraint classes causes
 348   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 349   // If an exception is thrown, returns the bci of the
 350   // exception handler which caused the exception to be thrown, which
 351   // is needed for proper retries. See, for example,
 352   // InterpreterRuntime::exception_handler_for_exception.
 353   static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
 354 
 355   // method data access
 356   MethodData* method_data() const              {
 357     return _method_data;
 358   }
 359 
 360   void set_method_data(MethodData* data)       {
 361     // The store into method must be released. On platforms without
 362     // total store order (TSO) the reference may become visible before
 363     // the initialization of data otherwise.
 364     OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
 365   }
 366 
 367   MethodCounters* method_counters() const {
 368     return _method_counters;
 369   }
 370 
 371   void clear_method_counters() {
 372     _method_counters = NULL;
 373   }
 374 
 375   bool init_method_counters(MethodCounters* counters) {
 376     // Try to install a pointer to MethodCounters, return true on success.
 377     return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
 378   }
 379 
 380 #ifdef TIERED
 381   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 382   // We can do that since interpreter_invocation_count is not used in tiered.
 383   int prev_event_count() const                   {
 384     if (method_counters() == NULL) {
 385       return 0;
 386     } else {
 387       return method_counters()->interpreter_invocation_count();
 388     }
 389   }
 390   void set_prev_event_count(int count) {
 391     MethodCounters* mcs = method_counters();
 392     if (mcs != NULL) {
 393       mcs->set_interpreter_invocation_count(count);
 394     }
 395   }
 396   jlong prev_time() const                        {
 397     MethodCounters* mcs = method_counters();
 398     return mcs == NULL ? 0 : mcs->prev_time();
 399   }
 400   void set_prev_time(jlong time) {
 401     MethodCounters* mcs = method_counters();
 402     if (mcs != NULL) {
 403       mcs->set_prev_time(time);
 404     }
 405   }
 406   float rate() const                             {
 407     MethodCounters* mcs = method_counters();
 408     return mcs == NULL ? 0 : mcs->rate();
 409   }
 410   void set_rate(float rate) {
 411     MethodCounters* mcs = method_counters();
 412     if (mcs != NULL) {
 413       mcs->set_rate(rate);
 414     }
 415   }
 416 #endif
 417 
 418   int invocation_count();
 419   int backedge_count();
 420 
 421   bool was_executed_more_than(int n);
 422   bool was_never_executed()                      { return !was_executed_more_than(0); }
 423 
 424   static void build_interpreter_method_data(methodHandle method, TRAPS);
 425 
 426   static MethodCounters* build_method_counters(Method* m, TRAPS);
 427 
 428   int interpreter_invocation_count() {
 429     if (TieredCompilation) {
 430       return invocation_count();
 431     } else {
 432       MethodCounters* mcs = method_counters();
 433       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 434     }
 435   }
 436   int increment_interpreter_invocation_count(TRAPS) {
 437     if (TieredCompilation) ShouldNotReachHere();
 438     MethodCounters* mcs = get_method_counters(CHECK_0);
 439     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 440   }
 441 
 442 #ifndef PRODUCT
 443   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 444   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 445 #endif // not PRODUCT
 446 
 447   // Clear (non-shared space) pointers which could not be relevant
 448   // if this (shared) method were mapped into another JVM.
 449   void remove_unshareable_info();
 450 
 451   // nmethod/verified compiler entry
 452   address verified_code_entry();
 453   bool check_code() const;      // Not inline to avoid circular ref
 454   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
 455   void clear_code(bool acquire_lock = true);            // Clear out any compiled code
 456   static void set_code(methodHandle mh, nmethod* code);
 457   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
 458   address get_i2c_entry();
 459   address get_c2i_entry();
 460   address get_c2i_unverified_entry();
 461   AdapterHandlerEntry* adapter() {  return _adapter; }
 462   // setup entry points
 463   void link_method(methodHandle method, TRAPS);
 464   // clear entry points. Used by sharing code
 465   void unlink_method();
 466 
 467   // vtable index
 468   enum VtableIndexFlag {
 469     // Valid vtable indexes are non-negative (>= 0).
 470     // These few negative values are used as sentinels.
 471     itable_index_max        = -10, // first itable index, growing downward
 472     pending_itable_index    = -9,  // itable index will be assigned
 473     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 474     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 475     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 476     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 477   };
 478   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 479   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 480   int  vtable_index() const                      { return _vtable_index; }
 481   void set_vtable_index(int index);
 482   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 483   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 484   int  itable_index() const                      { assert(valid_itable_index(), "");
 485                                                    return itable_index_max - _vtable_index; }
 486   void set_itable_index(int index);
 487 
 488   // interpreter entry
 489   address interpreter_entry() const              { return _i2i_entry; }
 490   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 491   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
 492 
 493   // native function (used for native methods only)
 494   enum {
 495     native_bind_event_is_interesting = true
 496   };
 497   address native_function() const                { return *(native_function_addr()); }
 498   address critical_native_function();
 499 
 500   // Must specify a real function (not NULL).
 501   // Use clear_native_function() to unregister.
 502   void set_native_function(address function, bool post_event_flag);
 503   bool has_native_function() const;
 504   void clear_native_function();
 505 
 506   // signature handler (used for native methods only)
 507   address signature_handler() const              { return *(signature_handler_addr()); }
 508   void set_signature_handler(address handler);
 509 
 510   // Interpreter oopmap support
 511   void mask_for(int bci, InterpreterOopMap* mask);
 512 
 513 #ifndef PRODUCT
 514   // operations on invocation counter
 515   void print_invocation_count();
 516 #endif
 517 
 518   // byte codes
 519   void    set_code(address code)      { return constMethod()->set_code(code); }
 520   address code_base() const           { return constMethod()->code_base(); }
 521   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 522 
 523   // prints byte codes
 524   void print_codes() const            { print_codes_on(tty); }
 525   void print_codes_on(outputStream* st) const                      PRODUCT_RETURN;
 526   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
 527 
 528   // method parameters
 529   bool has_method_parameters() const
 530                          { return constMethod()->has_method_parameters(); }
 531   int method_parameters_length() const
 532                          { return constMethod()->method_parameters_length(); }
 533   MethodParametersElement* method_parameters_start() const
 534                           { return constMethod()->method_parameters_start(); }
 535 
 536   // checked exceptions
 537   int checked_exceptions_length() const
 538                          { return constMethod()->checked_exceptions_length(); }
 539   CheckedExceptionElement* checked_exceptions_start() const
 540                           { return constMethod()->checked_exceptions_start(); }
 541 
 542   // localvariable table
 543   bool has_localvariable_table() const
 544                           { return constMethod()->has_localvariable_table(); }
 545   int localvariable_table_length() const
 546                         { return constMethod()->localvariable_table_length(); }
 547   LocalVariableTableElement* localvariable_table_start() const
 548                          { return constMethod()->localvariable_table_start(); }
 549 
 550   bool has_linenumber_table() const
 551                               { return constMethod()->has_linenumber_table(); }
 552   u_char* compressed_linenumber_table() const
 553                        { return constMethod()->compressed_linenumber_table(); }
 554 
 555   // method holder (the Klass* holding this method)
 556   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 557 
 558   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 559   Symbol* klass_name() const;                    // returns the name of the method holder
 560   BasicType result_type() const;                 // type of the method result
 561   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 562   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 563 
 564   // Checked exceptions thrown by this method (resolved to mirrors)
 565   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 566 
 567   // Access flags
 568   bool is_public() const                         { return access_flags().is_public();      }
 569   bool is_private() const                        { return access_flags().is_private();     }
 570   bool is_protected() const                      { return access_flags().is_protected();   }
 571   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 572   bool is_static() const                         { return access_flags().is_static();      }
 573   bool is_final() const                          { return access_flags().is_final();       }
 574   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 575   bool is_native() const                         { return access_flags().is_native();      }
 576   bool is_abstract() const                       { return access_flags().is_abstract();    }
 577   bool is_strict() const                         { return access_flags().is_strict();      }
 578   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 579 
 580   // returns true if contains only return operation
 581   bool is_empty_method() const;
 582 
 583   // returns true if this is a vanilla constructor
 584   bool is_vanilla_constructor() const;
 585 
 586   // checks method and its method holder
 587   bool is_final_method() const;
 588   bool is_final_method(AccessFlags class_access_flags) const;
 589   bool is_default_method() const;
 590 
 591   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 592   bool can_be_statically_bound() const;
 593   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 594 
 595   // returns true if the method has any backward branches.
 596   bool has_loops() {
 597     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 598   };
 599 
 600   bool compute_has_loops_flag();
 601 
 602   bool has_jsrs() {
 603     return access_flags().has_jsrs();
 604   };
 605   void set_has_jsrs() {
 606     _access_flags.set_has_jsrs();
 607   }
 608 
 609   // returns true if the method has any monitors.
 610   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 611   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 612 
 613   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 614 
 615   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 616   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 617   // has not been computed yet.
 618   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 619   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 620 
 621   // returns true if the method is an accessor function (setter/getter).
 622   bool is_accessor() const;
 623 
 624   // returns true if the method does nothing but return a constant of primitive type
 625   bool is_constant_getter() const;
 626 
 627   // returns true if the method is an initializer (<init> or <clinit>).
 628   bool is_initializer() const;
 629 
 630   // returns true if the method is static OR if the classfile version < 51
 631   bool has_valid_initializer_flags() const;
 632 
 633   // returns true if the method name is <clinit> and the method has
 634   // valid static initializer flags.
 635   bool is_static_initializer() const;
 636 
 637   // returns true if the method name is <init>
 638   bool is_object_initializer() const;
 639 
 640   // compiled code support
 641   // NOTE: code() is inherently racy as deopt can be clearing code
 642   // simultaneously. Use with caution.
 643   bool has_compiled_code() const                 { return code() != NULL; }
 644 
 645   // sizing
 646   static int header_size()                       { return sizeof(Method)/HeapWordSize; }
 647   static int size(bool is_native);
 648   int size() const                               { return method_size(); }
 649 #if INCLUDE_SERVICES
 650   void collect_statistics(KlassSizeStats *sz) const;
 651 #endif
 652 
 653   // interpreter support
 654   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 655   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 656   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 657   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 658   static ByteSize method_data_offset()           {
 659     return byte_offset_of(Method, _method_data);
 660   }
 661   static ByteSize method_counters_offset()       {
 662     return byte_offset_of(Method, _method_counters);
 663   }
 664 #ifndef PRODUCT
 665   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 666 #endif // not PRODUCT
 667   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 668   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 669   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 670   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 671   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 672 
 673   // for code generation
 674   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 675   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 676   static int intrinsic_id_size_in_bytes()        { return sizeof(u1); }
 677 
 678   // Static methods that are used to implement member methods where an exposed this pointer
 679   // is needed due to possible GCs
 680   static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
 681 
 682   // Returns the byte code index from the byte code pointer
 683   int     bci_from(address bcp) const;
 684   address bcp_from(int     bci) const;
 685   int validate_bci_from_bcx(intptr_t bcx) const;
 686 
 687   // Returns the line number for a bci if debugging information for the method is prowided,
 688   // -1 is returned otherwise.
 689   int line_number_from_bci(int bci) const;
 690 
 691   // Reflection support
 692   bool is_overridden_in(Klass* k) const;
 693 
 694   // Stack walking support
 695   bool is_ignored_by_security_stack_walk() const;
 696 
 697   // JSR 292 support
 698   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 699   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 700   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 701   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 702                                                    Symbol* signature, //anything at all
 703                                                    TRAPS);
 704   static Klass* check_non_bcp_klass(Klass* klass);
 705 
 706   // How many extra stack entries for invokedynamic when it's enabled
 707   static const int extra_stack_entries_for_jsr292 = 1;
 708 
 709   // this operates only on invoke methods:
 710   // presize interpreter frames for extra interpreter stack entries, if needed
 711   // Account for the extra appendix argument for invokehandle/invokedynamic
 712   static int extra_stack_entries() { return EnableInvokeDynamic ? extra_stack_entries_for_jsr292 : 0; }
 713   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 714 
 715   // RedefineClasses() support:
 716   bool is_old() const                               { return access_flags().is_old(); }
 717   void set_is_old()                                 { _access_flags.set_is_old(); }
 718   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 719   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 720   bool is_deleted() const                           { return access_flags().is_deleted(); }
 721   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 722 
 723   bool is_running_emcp() const {
 724     // EMCP methods are old but not obsolete or deleted. Equivalent
 725     // Modulo Constant Pool means the method is equivalent except
 726     // the constant pool and instructions that access the constant
 727     // pool might be different.
 728     // If a breakpoint is set in a redefined method, its EMCP methods that are
 729     // still running must have a breakpoint also.
 730     return _running_emcp;
 731   }
 732 
 733   void set_running_emcp(bool x) {
 734     _running_emcp = x;
 735   }
 736 
 737   bool on_stack() const                             { return access_flags().on_stack(); }
 738   void set_on_stack(const bool value);
 739 
 740   // see the definition in Method*.cpp for the gory details
 741   bool should_not_be_cached() const;
 742 
 743   // JVMTI Native method prefixing support:
 744   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 745   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 746 
 747   // Rewriting support
 748   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 749                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 750 
 751   // jmethodID handling
 752   // Because the useful life-span of a jmethodID cannot be determined,
 753   // once created they are never reclaimed.  The methods to which they refer,
 754   // however, can be GC'ed away if the class is unloaded or if the method is
 755   // made obsolete or deleted -- in these cases, the jmethodID
 756   // refers to NULL (as is the case for any weak reference).
 757   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 758   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 759 
 760   // Use resolve_jmethod_id() in situations where the caller is expected
 761   // to provide a valid jmethodID; the only sanity checks are in asserts;
 762   // result guaranteed not to be NULL.
 763   inline static Method* resolve_jmethod_id(jmethodID mid) {
 764     assert(mid != NULL, "JNI method id should not be null");
 765     return *((Method**)mid);
 766   }
 767 
 768   // Use checked_resolve_jmethod_id() in situations where the caller
 769   // should provide a valid jmethodID, but might not. NULL is returned
 770   // when the jmethodID does not refer to a valid method.
 771   static Method* checked_resolve_jmethod_id(jmethodID mid);
 772 
 773   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 774   static bool is_method_id(jmethodID mid);
 775 
 776   // Clear methods
 777   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 778   static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 779 
 780   // Get this method's jmethodID -- allocate if it doesn't exist
 781   jmethodID jmethod_id()                            { methodHandle this_h(this);
 782                                                       return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
 783 
 784   // Lookup the jmethodID for this method.  Return NULL if not found.
 785   // NOTE that this function can be called from a signal handler
 786   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 787   // needs to be async-safe. No allocation should be done and
 788   // so handles are not used to avoid deadlock.
 789   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 790 
 791   // Support for inlining of intrinsic methods
 792   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 793   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u1) id; }
 794 
 795   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 796   void init_intrinsic_id();     // updates from _none if a match
 797   void clear_jmethod_id(ClassLoaderData* loader_data);
 798 
 799   static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
 800 
 801   bool     jfr_towrite()                { return _jfr_towrite;              }
 802   void set_jfr_towrite(bool x)          {        _jfr_towrite = x;          }
 803   bool     caller_sensitive()           { return _caller_sensitive;         }
 804   void set_caller_sensitive(bool x)     {        _caller_sensitive = x;     }
 805   bool     force_inline()               { return _force_inline;             }
 806   void set_force_inline(bool x)         {        _force_inline = x;         }
 807   bool     dont_inline()                { return _dont_inline;              }
 808   void set_dont_inline(bool x)          {        _dont_inline = x;          }
 809   bool  is_hidden()                     { return _hidden;                   }
 810   void set_hidden(bool x)               {        _hidden = x;               }
 811   bool     has_injected_profile()       { return _has_injected_profile;     }
 812   void set_has_injected_profile(bool x) {        _has_injected_profile = x; }
 813 
 814   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 815 
 816   ConstMethod::MethodType method_type() const {
 817       return _constMethod->method_type();
 818   }
 819   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 820 
 821   // On-stack replacement support
 822   bool has_osr_nmethod(int level, bool match_level) {
 823    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 824   }
 825 
 826   int mark_osr_nmethods() {
 827     return method_holder()->mark_osr_nmethods(this);
 828   }
 829 
 830   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 831     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 832   }
 833 
 834   // Inline cache support
 835   void cleanup_inline_caches();
 836 
 837   // Find if klass for method is loaded
 838   bool is_klass_loaded_by_klass_index(int klass_index) const;
 839   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 840 
 841   // Indicates whether compilation failed earlier for this method, or
 842   // whether it is not compilable for another reason like having a
 843   // breakpoint set in it.
 844   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 845   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 846   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 847     set_not_compilable(comp_level, false);
 848   }
 849   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 850   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 851   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 852     set_not_osr_compilable(comp_level, false);
 853   }
 854   bool is_always_compilable() const;
 855 
 856  private:
 857   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 858 
 859  public:
 860   MethodCounters* get_method_counters(TRAPS) {
 861     if (_method_counters == NULL) {
 862       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 863     }
 864     return _method_counters;
 865   }
 866 
 867   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 868   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 869   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 870   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 871   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 872   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 873 
 874   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 875   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 876   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 877   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 878   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 879   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 880 
 881   // Background compilation support
 882   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 883   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 884   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 885 
 886   // Resolve all classes in signature, return 'true' if successful
 887   static bool load_signature_classes(methodHandle m, TRAPS);
 888 
 889   // Return if true if not all classes references in signature, including return type, has been loaded
 890   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 891 
 892   // Printing
 893   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 894 #if INCLUDE_JVMTI
 895   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 896 #else
 897   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 898 #endif
 899 
 900   // Helper routine used for method sorting
 901   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 902 
 903   // Deallocation function for redefine classes or if an error occurs
 904   void deallocate_contents(ClassLoaderData* loader_data);
 905 
 906   // Printing
 907 #ifndef PRODUCT
 908   void print_on(outputStream* st) const;
 909 #endif
 910   void print_value_on(outputStream* st) const;
 911 
 912   const char* internal_name() const { return "{method}"; }
 913 
 914   // Check for valid method pointer
 915   static bool has_method_vptr(const void* ptr);
 916   bool is_valid_method() const;
 917 
 918   // Verify
 919   void verify() { verify_on(tty); }
 920   void verify_on(outputStream* st);
 921 
 922  private:
 923 
 924   // Inlined elements
 925   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 926   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 927 };
 928 
 929 
 930 // Utility class for compressing line number tables
 931 
 932 class CompressedLineNumberWriteStream: public CompressedWriteStream {
 933  private:
 934   int _bci;
 935   int _line;
 936  public:
 937   // Constructor
 938   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
 939   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
 940 
 941   // Write (bci, line number) pair to stream
 942   void write_pair_regular(int bci_delta, int line_delta);
 943 
 944   inline void write_pair_inline(int bci, int line) {
 945     int bci_delta = bci - _bci;
 946     int line_delta = line - _line;
 947     _bci = bci;
 948     _line = line;
 949     // Skip (0,0) deltas - they do not add information and conflict with terminator.
 950     if (bci_delta == 0 && line_delta == 0) return;
 951     // Check if bci is 5-bit and line number 3-bit unsigned.
 952     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 953       // Compress into single byte.
 954       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 955       // Check that value doesn't match escape character.
 956       if (value != 0xFF) {
 957         write_byte(value);
 958         return;
 959       }
 960     }
 961     write_pair_regular(bci_delta, line_delta);
 962   }
 963 
 964 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
 965 // Disabling optimization doesn't work for methods in header files
 966 // so we force it to call through the non-optimized version in the .cpp.
 967 // It's gross, but it's the only way we can ensure that all callers are
 968 // fixed.  _MSC_VER is defined by the windows compiler
 969 #if defined(_M_AMD64) && _MSC_VER >= 1400
 970   void write_pair(int bci, int line);
 971 #else
 972   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
 973 #endif
 974 
 975   // Write end-of-stream marker
 976   void write_terminator()                        { write_byte(0); }
 977 };
 978 
 979 
 980 // Utility class for decompressing line number tables
 981 
 982 class CompressedLineNumberReadStream: public CompressedReadStream {
 983  private:
 984   int _bci;
 985   int _line;
 986  public:
 987   // Constructor
 988   CompressedLineNumberReadStream(u_char* buffer);
 989   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
 990   bool read_pair();
 991   // Accessing bci and line number (after calling read_pair)
 992   int bci() const                               { return _bci; }
 993   int line() const                              { return _line; }
 994 };
 995 
 996 
 997 /// Fast Breakpoints.
 998 
 999 // If this structure gets more complicated (because bpts get numerous),
1000 // move it into its own header.
1001 
1002 // There is presently no provision for concurrent access
1003 // to breakpoint lists, which is only OK for JVMTI because
1004 // breakpoints are written only at safepoints, and are read
1005 // concurrently only outside of safepoints.
1006 
1007 class BreakpointInfo : public CHeapObj<mtClass> {
1008   friend class VMStructs;
1009  private:
1010   Bytecodes::Code  _orig_bytecode;
1011   int              _bci;
1012   u2               _name_index;       // of method
1013   u2               _signature_index;  // of method
1014   BreakpointInfo*  _next;             // simple storage allocation
1015 
1016  public:
1017   BreakpointInfo(Method* m, int bci);
1018 
1019   // accessors
1020   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1021   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1022   int         bci()                                   { return _bci; }
1023 
1024   BreakpointInfo*          next() const               { return _next; }
1025   void                 set_next(BreakpointInfo* n)    { _next = n; }
1026 
1027   // helps for searchers
1028   bool match(const Method* m, int bci) {
1029     return bci == _bci && match(m);
1030   }
1031 
1032   bool match(const Method* m) {
1033     return _name_index == m->name_index() &&
1034       _signature_index == m->signature_index();
1035   }
1036 
1037   void set(Method* method);
1038   void clear(Method* method);
1039 };
1040 
1041 // Utility class for access exception handlers
1042 class ExceptionTable : public StackObj {
1043  private:
1044   ExceptionTableElement* _table;
1045   u2  _length;
1046 
1047  public:
1048   ExceptionTable(const Method* m) {
1049     if (m->has_exception_handler()) {
1050       _table = m->exception_table_start();
1051       _length = m->exception_table_length();
1052     } else {
1053       _table = NULL;
1054       _length = 0;
1055     }
1056   }
1057 
1058   int length() const {
1059     return _length;
1060   }
1061 
1062   u2 start_pc(int idx) const {
1063     assert(idx < _length, "out of bounds");
1064     return _table[idx].start_pc;
1065   }
1066 
1067   void set_start_pc(int idx, u2 value) {
1068     assert(idx < _length, "out of bounds");
1069     _table[idx].start_pc = value;
1070   }
1071 
1072   u2 end_pc(int idx) const {
1073     assert(idx < _length, "out of bounds");
1074     return _table[idx].end_pc;
1075   }
1076 
1077   void set_end_pc(int idx, u2 value) {
1078     assert(idx < _length, "out of bounds");
1079     _table[idx].end_pc = value;
1080   }
1081 
1082   u2 handler_pc(int idx) const {
1083     assert(idx < _length, "out of bounds");
1084     return _table[idx].handler_pc;
1085   }
1086 
1087   void set_handler_pc(int idx, u2 value) {
1088     assert(idx < _length, "out of bounds");
1089     _table[idx].handler_pc = value;
1090   }
1091 
1092   u2 catch_type_index(int idx) const {
1093     assert(idx < _length, "out of bounds");
1094     return _table[idx].catch_type_index;
1095   }
1096 
1097   void set_catch_type_index(int idx, u2 value) {
1098     assert(idx < _length, "out of bounds");
1099     _table[idx].catch_type_index = value;
1100   }
1101 };
1102 
1103 #endif // SHARE_VM_OOPS_METHODOOP_HPP