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