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