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/compilerDefinitions.hpp"
  31 #include "compiler/oopMap.hpp"
  32 #include "interpreter/invocationCounter.hpp"
  33 #include "oops/annotations.hpp"
  34 #include "oops/constantPool.hpp"
  35 #include "oops/methodCounters.hpp"
  36 #include "oops/instanceKlass.hpp"
  37 #include "oops/oop.hpp"
  38 #include "oops/typeArrayOop.hpp"
  39 #include "utilities/accessFlags.hpp"
  40 #include "utilities/growableArray.hpp"
  41 
  42 // A Method represents a Java method.
  43 //
  44 // Note that most applications load thousands of methods, so keeping the size of this
  45 // class small has a big impact on footprint.
  46 //
  47 // Note that native_function and signature_handler have to be at fixed offsets
  48 // (required by the interpreter)
  49 //
  50 //  Method embedded field layout (after declared fields):
  51 //   [EMBEDDED native_function       (present only if native) ]
  52 //   [EMBEDDED signature_handler     (present only if native) ]
  53 
  54 class CheckedExceptionElement;
  55 class LocalVariableTableElement;
  56 class AdapterHandlerEntry;
  57 class MethodData;
  58 class MethodCounters;
  59 class ConstMethod;
  60 class InlineTableSizes;
  61 class KlassSizeStats;
  62 class CompiledMethod;
  63 
  64 class Method : public Metadata {
  65  friend class VMStructs;
  66  friend class JVMCIVMStructs;
  67  private:
  68   ConstMethod*      _constMethod;                // Method read-only data.
  69   MethodData*       _method_data;
  70   MethodCounters*   _method_counters;
  71   AccessFlags       _access_flags;               // Access flags
  72   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  73                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  74   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  75 
  76   // Flags
  77   enum Flags {
  78     _caller_sensitive      = 1 << 0,
  79     _force_inline          = 1 << 1,
  80     _dont_inline           = 1 << 2,
  81     _hidden                = 1 << 3,
  82     _has_injected_profile  = 1 << 4,
  83     _running_emcp          = 1 << 5,
  84     _intrinsic_candidate   = 1 << 6,
  85     _reserved_stack_access = 1 << 7
  86   };
  87   mutable u2 _flags;
  88 
  89   TRACE_DEFINE_FLAG;
  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   // Entry point for calling from compiled code, to compiled code if it exists
  97   // or else the interpreter.
  98   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
  99   // The entry point for calling both from and to compiled code is
 100   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 101   // field can come and go.  It can transition from NULL to not-null at any
 102   // time (whenever a compile completes).  It can transition from not-null to
 103   // NULL only at safepoints (because of a de-opt).
 104   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 105   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 106 
 107 #if INCLUDE_AOT && defined(TIERED)
 108   CompiledMethod* _aot_code;
 109 #endif
 110 
 111   // Constructor
 112   Method(ConstMethod* xconst, AccessFlags access_flags);
 113  public:
 114 
 115   static Method* allocate(ClassLoaderData* loader_data,
 116                           int byte_code_size,
 117                           AccessFlags access_flags,
 118                           InlineTableSizes* sizes,
 119                           ConstMethod::MethodType method_type,
 120                           TRAPS);
 121 
 122   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 123   Method(){}
 124 
 125   // The Method vtable is restored by this call when the Method is in the
 126   // shared archive.  See patch_klass_vtables() in metaspaceShared.cpp for
 127   // all the gory details.  SA, dtrace and pstack helpers distinguish metadata
 128   // by their vtable.
 129   void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
 130   bool is_method() const volatile { return true; }
 131 
 132   void restore_unshareable_info(TRAPS);
 133 
 134   // accessors for instance variables
 135 
 136   ConstMethod* constMethod() const             { return _constMethod; }
 137   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 138 
 139 
 140   static address make_adapters(methodHandle mh, TRAPS);
 141   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 142   volatile address from_compiled_entry_no_trampoline() const;
 143   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 144 
 145   // access flag
 146   AccessFlags access_flags() const               { return _access_flags;  }
 147   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 148 
 149   // name
 150   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 151   int name_index() const                         { return constMethod()->name_index();         }
 152   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 153 
 154   // signature
 155   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 156   int signature_index() const                    { return constMethod()->signature_index();         }
 157   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 158 
 159   // generics support
 160   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 161   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 162   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 163 
 164   // annotations support
 165   AnnotationArray* annotations() const           {
 166     return constMethod()->method_annotations();
 167   }
 168   AnnotationArray* parameter_annotations() const {
 169     return constMethod()->parameter_annotations();
 170   }
 171   AnnotationArray* annotation_default() const    {
 172     return constMethod()->default_annotations();
 173   }
 174   AnnotationArray* type_annotations() const      {
 175     return constMethod()->type_annotations();
 176   }
 177 
 178   // Helper routine: get klass name + "." + method name + signature as
 179   // C string, for the purpose of providing more useful NoSuchMethodErrors
 180   // and fatal error handling. The string is allocated in resource
 181   // area if a buffer is not provided by the caller.
 182   char* name_and_sig_as_C_string() const;
 183   char* name_and_sig_as_C_string(char* buf, int size) const;
 184 
 185   // Static routine in the situations we don't have a Method*
 186   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 187   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 188 
 189   Bytecodes::Code java_code_at(int bci) const {
 190     return Bytecodes::java_code_at(this, bcp_from(bci));
 191   }
 192   Bytecodes::Code code_at(int bci) const {
 193     return Bytecodes::code_at(this, bcp_from(bci));
 194   }
 195 
 196   // JVMTI breakpoints
 197 #if !INCLUDE_JVMTI
 198   Bytecodes::Code orig_bytecode_at(int bci) const {
 199     ShouldNotReachHere();
 200     return Bytecodes::_shouldnotreachhere;
 201   }
 202   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 203     ShouldNotReachHere();
 204   };
 205   u2   number_of_breakpoints() const {return 0;}
 206 #else // !INCLUDE_JVMTI
 207   Bytecodes::Code orig_bytecode_at(int bci) const;
 208   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 209   void set_breakpoint(int bci);
 210   void clear_breakpoint(int bci);
 211   void clear_all_breakpoints();
 212   // Tracking number of breakpoints, for fullspeed debugging.
 213   // Only mutated by VM thread.
 214   u2   number_of_breakpoints()             const {
 215     MethodCounters* mcs = method_counters();
 216     if (mcs == NULL) {
 217       return 0;
 218     } else {
 219       return mcs->number_of_breakpoints();
 220     }
 221   }
 222   void incr_number_of_breakpoints(TRAPS)         {
 223     MethodCounters* mcs = get_method_counters(CHECK);
 224     if (mcs != NULL) {
 225       mcs->incr_number_of_breakpoints();
 226     }
 227   }
 228   void decr_number_of_breakpoints(TRAPS)         {
 229     MethodCounters* mcs = get_method_counters(CHECK);
 230     if (mcs != NULL) {
 231       mcs->decr_number_of_breakpoints();
 232     }
 233   }
 234   // Initialization only
 235   void clear_number_of_breakpoints()             {
 236     MethodCounters* mcs = method_counters();
 237     if (mcs != NULL) {
 238       mcs->clear_number_of_breakpoints();
 239     }
 240   }
 241 #endif // !INCLUDE_JVMTI
 242 
 243   // index into InstanceKlass methods() array
 244   // note: also used by jfr
 245   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 246   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 247 
 248   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 249   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 250 
 251   // code size
 252   int code_size() const                  { return constMethod()->code_size(); }
 253 
 254   // method size in words
 255   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 256 
 257   // constant pool for Klass* holding this method
 258   ConstantPool* constants() const              { return constMethod()->constants(); }
 259   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 260 
 261   // max stack
 262   // return original max stack size for method verification
 263   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 264   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 265   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 266 
 267   // max locals
 268   int  max_locals() const                        { return constMethod()->max_locals(); }
 269   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 270 
 271   int highest_comp_level() const;
 272   void set_highest_comp_level(int level);
 273   int highest_osr_comp_level() const;
 274   void set_highest_osr_comp_level(int level);
 275 
 276 #if defined(COMPILER2) || INCLUDE_JVMCI
 277   // Count of times method was exited via exception while interpreting
 278   void interpreter_throwout_increment(TRAPS) {
 279     MethodCounters* mcs = get_method_counters(CHECK);
 280     if (mcs != NULL) {
 281       mcs->interpreter_throwout_increment();
 282     }
 283   }
 284 #endif
 285 
 286   int  interpreter_throwout_count() const        {
 287     MethodCounters* mcs = method_counters();
 288     if (mcs == NULL) {
 289       return 0;
 290     } else {
 291       return mcs->interpreter_throwout_count();
 292     }
 293   }
 294 
 295   // size of parameters
 296   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 297   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 298 
 299   bool has_stackmap_table() const {
 300     return constMethod()->has_stackmap_table();
 301   }
 302 
 303   Array<u1>* stackmap_data() const {
 304     return constMethod()->stackmap_data();
 305   }
 306 
 307   void set_stackmap_data(Array<u1>* sd) {
 308     constMethod()->set_stackmap_data(sd);
 309   }
 310 
 311   // exception handler table
 312   bool has_exception_handler() const
 313                              { return constMethod()->has_exception_handler(); }
 314   int exception_table_length() const
 315                              { return constMethod()->exception_table_length(); }
 316   ExceptionTableElement* exception_table_start() const
 317                              { return constMethod()->exception_table_start(); }
 318 
 319   // Finds the first entry point bci of an exception handler for an
 320   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 321   // for ex_klass indicates that the exception klass is not known; in
 322   // this case it matches any constraint class. Returns -1 if the
 323   // exception cannot be handled in this method. The handler
 324   // constraint classes are loaded if necessary. Note that this may
 325   // throw an exception if loading of the constraint classes causes
 326   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 327   // If an exception is thrown, returns the bci of the
 328   // exception handler which caused the exception to be thrown, which
 329   // is needed for proper retries. See, for example,
 330   // InterpreterRuntime::exception_handler_for_exception.
 331   static int fast_exception_handler_bci_for(methodHandle mh, Klass* ex_klass, int throw_bci, TRAPS);
 332 
 333   // method data access
 334   MethodData* method_data() const              {
 335     return _method_data;
 336   }
 337 
 338   void set_method_data(MethodData* data)       {
 339     // The store into method must be released. On platforms without
 340     // total store order (TSO) the reference may become visible before
 341     // the initialization of data otherwise.
 342     OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
 343   }
 344 
 345   MethodCounters* method_counters() const {
 346     return _method_counters;
 347   }
 348 
 349   void clear_method_counters() {
 350     _method_counters = NULL;
 351   }
 352 
 353   bool init_method_counters(MethodCounters* counters) {
 354     // Try to install a pointer to MethodCounters, return true on success.
 355     return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
 356   }
 357 
 358 #ifdef TIERED
 359   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 360   // We can do that since interpreter_invocation_count is not used in tiered.
 361   int prev_event_count() const                   {
 362     if (method_counters() == NULL) {
 363       return 0;
 364     } else {
 365       return method_counters()->interpreter_invocation_count();
 366     }
 367   }
 368   void set_prev_event_count(int count) {
 369     MethodCounters* mcs = method_counters();
 370     if (mcs != NULL) {
 371       mcs->set_interpreter_invocation_count(count);
 372     }
 373   }
 374   jlong prev_time() const                        {
 375     MethodCounters* mcs = method_counters();
 376     return mcs == NULL ? 0 : mcs->prev_time();
 377   }
 378   void set_prev_time(jlong time) {
 379     MethodCounters* mcs = method_counters();
 380     if (mcs != NULL) {
 381       mcs->set_prev_time(time);
 382     }
 383   }
 384   float rate() const                             {
 385     MethodCounters* mcs = method_counters();
 386     return mcs == NULL ? 0 : mcs->rate();
 387   }
 388   void set_rate(float rate) {
 389     MethodCounters* mcs = method_counters();
 390     if (mcs != NULL) {
 391       mcs->set_rate(rate);
 392     }
 393   }
 394 
 395 #if INCLUDE_AOT
 396   void set_aot_code(CompiledMethod* aot_code) {
 397     _aot_code = aot_code;
 398   }
 399 
 400   CompiledMethod* aot_code() const {
 401     return _aot_code;
 402   }
 403 #else
 404   CompiledMethod* aot_code() const { return NULL; }
 405 #endif // INCLUDE_AOT
 406 #endif // TIERED
 407 
 408   int nmethod_age() const {
 409     if (method_counters() == NULL) {
 410       return INT_MAX;
 411     } else {
 412       return method_counters()->nmethod_age();
 413     }
 414   }
 415 
 416   int invocation_count();
 417   int backedge_count();
 418 
 419   bool was_executed_more_than(int n);
 420   bool was_never_executed()                      { return !was_executed_more_than(0); }
 421 
 422   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 423 
 424   static MethodCounters* build_method_counters(Method* m, TRAPS);
 425 
 426   int interpreter_invocation_count() {
 427     if (TieredCompilation) {
 428       return invocation_count();
 429     } else {
 430       MethodCounters* mcs = method_counters();
 431       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 432     }
 433   }
 434 #if defined(COMPILER2) || INCLUDE_JVMCI
 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 #endif
 441 
 442 #ifndef PRODUCT
 443   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 444   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 445 #else
 446   // for PrintMethodData in a product build
 447   int  compiled_invocation_count() const         { return 0;  }
 448 #endif // not PRODUCT
 449 
 450   // Clear (non-shared space) pointers which could not be relevant
 451   // if this (shared) method were mapped into another JVM.
 452   void remove_unshareable_info();
 453 
 454   // nmethod/verified compiler entry
 455   address verified_code_entry();
 456   bool check_code() const;      // Not inline to avoid circular ref
 457   CompiledMethod* volatile code() const                 { assert( check_code(), "" ); return (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); }
 458   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 459   static void set_code(methodHandle mh, CompiledMethod* code);
 460   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 461     constMethod()->set_adapter_entry(adapter);
 462   }
 463   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 464     constMethod()->update_adapter_trampoline(adapter);
 465   }
 466 
 467   address get_i2c_entry();
 468   address get_c2i_entry();
 469   address get_c2i_unverified_entry();
 470   AdapterHandlerEntry* adapter() const {
 471     return constMethod()->adapter();
 472   }
 473   // setup entry points
 474   void link_method(const methodHandle& method, TRAPS);
 475   // clear entry points. Used by sharing code during dump time
 476   void unlink_method() NOT_CDS_RETURN;
 477 
 478   // vtable index
 479   enum VtableIndexFlag {
 480     // Valid vtable indexes are non-negative (>= 0).
 481     // These few negative values are used as sentinels.
 482     itable_index_max        = -10, // first itable index, growing downward
 483     pending_itable_index    = -9,  // itable index will be assigned
 484     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 485     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 486     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 487     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 488   };
 489   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 490   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 491   int  vtable_index() const                      { return _vtable_index; }
 492   void set_vtable_index(int index);
 493   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 494   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 495   int  itable_index() const                      { assert(valid_itable_index(), "");
 496                                                    return itable_index_max - _vtable_index; }
 497   void set_itable_index(int index);
 498 
 499   // interpreter entry
 500   address interpreter_entry() const              { return _i2i_entry; }
 501   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 502   void set_interpreter_entry(address entry) {
 503     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 504     if (_i2i_entry != entry) {
 505       _i2i_entry = entry;
 506     }
 507     if (_from_interpreted_entry != entry) {
 508       _from_interpreted_entry = entry;
 509     }
 510   }
 511 
 512   // native function (used for native methods only)
 513   enum {
 514     native_bind_event_is_interesting = true
 515   };
 516   address native_function() const                { return *(native_function_addr()); }
 517   address critical_native_function();
 518 
 519   // Must specify a real function (not NULL).
 520   // Use clear_native_function() to unregister.
 521   void set_native_function(address function, bool post_event_flag);
 522   bool has_native_function() const;
 523   void clear_native_function();
 524 
 525   // signature handler (used for native methods only)
 526   address signature_handler() const              { return *(signature_handler_addr()); }
 527   void set_signature_handler(address handler);
 528 
 529   // Interpreter oopmap support
 530   void mask_for(int bci, InterpreterOopMap* mask);
 531 
 532   // operations on invocation counter
 533   void print_invocation_count();
 534 
 535   // byte codes
 536   void    set_code(address code)      { return constMethod()->set_code(code); }
 537   address code_base() const           { return constMethod()->code_base(); }
 538   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 539 
 540   // prints byte codes
 541   void print_codes() const            { print_codes_on(tty); }
 542   void print_codes_on(outputStream* st) const;
 543   void print_codes_on(int from, int to, outputStream* st) const;
 544 
 545   // method parameters
 546   bool has_method_parameters() const
 547                          { return constMethod()->has_method_parameters(); }
 548   int method_parameters_length() const
 549                          { return constMethod()->method_parameters_length(); }
 550   MethodParametersElement* method_parameters_start() const
 551                           { return constMethod()->method_parameters_start(); }
 552 
 553   // checked exceptions
 554   int checked_exceptions_length() const
 555                          { return constMethod()->checked_exceptions_length(); }
 556   CheckedExceptionElement* checked_exceptions_start() const
 557                           { return constMethod()->checked_exceptions_start(); }
 558 
 559   // localvariable table
 560   bool has_localvariable_table() const
 561                           { return constMethod()->has_localvariable_table(); }
 562   int localvariable_table_length() const
 563                         { return constMethod()->localvariable_table_length(); }
 564   LocalVariableTableElement* localvariable_table_start() const
 565                          { return constMethod()->localvariable_table_start(); }
 566 
 567   bool has_linenumber_table() const
 568                               { return constMethod()->has_linenumber_table(); }
 569   u_char* compressed_linenumber_table() const
 570                        { return constMethod()->compressed_linenumber_table(); }
 571 
 572   // method holder (the Klass* holding this method)
 573   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 574 
 575   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 576   Symbol* klass_name() const;                    // returns the name of the method holder
 577   BasicType result_type() const;                 // type of the method result
 578   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 579   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 580 
 581   // Checked exceptions thrown by this method (resolved to mirrors)
 582   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 583 
 584   // Access flags
 585   bool is_public() const                         { return access_flags().is_public();      }
 586   bool is_private() const                        { return access_flags().is_private();     }
 587   bool is_protected() const                      { return access_flags().is_protected();   }
 588   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 589   bool is_static() const                         { return access_flags().is_static();      }
 590   bool is_final() const                          { return access_flags().is_final();       }
 591   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 592   bool is_native() const                         { return access_flags().is_native();      }
 593   bool is_abstract() const                       { return access_flags().is_abstract();    }
 594   bool is_strict() const                         { return access_flags().is_strict();      }
 595   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 596 
 597   // returns true if contains only return operation
 598   bool is_empty_method() const;
 599 
 600   // returns true if this is a vanilla constructor
 601   bool is_vanilla_constructor() const;
 602 
 603   // checks method and its method holder
 604   bool is_final_method() const;
 605   bool is_final_method(AccessFlags class_access_flags) const;
 606   // interface method declared with 'default' - excludes private interface methods
 607   bool is_default_method() const;
 608 
 609   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 610   bool can_be_statically_bound() const;
 611   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 612 
 613   // returns true if the method has any backward branches.
 614   bool has_loops() {
 615     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 616   };
 617 
 618   bool compute_has_loops_flag();
 619 
 620   bool has_jsrs() {
 621     return access_flags().has_jsrs();
 622   };
 623   void set_has_jsrs() {
 624     _access_flags.set_has_jsrs();
 625   }
 626 
 627   // returns true if the method has any monitors.
 628   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 629   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 630 
 631   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 632 
 633   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 634   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 635   // has not been computed yet.
 636   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 637   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 638 
 639   // returns true if the method is an accessor function (setter/getter).
 640   bool is_accessor() const;
 641 
 642   // returns true if the method is a getter
 643   bool is_getter() const;
 644 
 645   // returns true if the method is a setter
 646   bool is_setter() const;
 647 
 648   // returns true if the method does nothing but return a constant of primitive type
 649   bool is_constant_getter() const;
 650 
 651   // returns true if the method is an initializer (<init> or <clinit>).
 652   bool is_initializer() const;
 653 
 654   // returns true if the method is static OR if the classfile version < 51
 655   bool has_valid_initializer_flags() const;
 656 
 657   // returns true if the method name is <clinit> and the method has
 658   // valid static initializer flags.
 659   bool is_static_initializer() const;
 660 
 661   // returns true if the method name is <init>
 662   bool is_object_initializer() const;
 663 
 664   // compiled code support
 665   // NOTE: code() is inherently racy as deopt can be clearing code
 666   // simultaneously. Use with caution.
 667   bool has_compiled_code() const                 { return code() != NULL; }
 668 
 669 #ifdef TIERED
 670   bool has_aot_code() const                      { return aot_code() != NULL; }
 671 #endif
 672 
 673   // sizing
 674   static int header_size()                       { return sizeof(Method)/wordSize; }
 675   static int size(bool is_native);
 676   int size() const                               { return method_size(); }
 677 #if INCLUDE_SERVICES
 678   void collect_statistics(KlassSizeStats *sz) const;
 679 #endif
 680   void log_touched(TRAPS);
 681   static void print_touched_methods(outputStream* out);
 682 
 683   // interpreter support
 684   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 685   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 686   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 687   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 688   static ByteSize method_data_offset()           {
 689     return byte_offset_of(Method, _method_data);
 690   }
 691   static ByteSize method_counters_offset()       {
 692     return byte_offset_of(Method, _method_counters);
 693   }
 694 #ifndef PRODUCT
 695   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 696 #endif // not PRODUCT
 697   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 698   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 699   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 700   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 701 
 702   // for code generation
 703   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 704   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 705   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 706 
 707   // Static methods that are used to implement member methods where an exposed this pointer
 708   // is needed due to possible GCs
 709   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 710 
 711   // Returns the byte code index from the byte code pointer
 712   int     bci_from(address bcp) const;
 713   address bcp_from(int bci) const;
 714   address bcp_from(address bcp) const;
 715   int validate_bci_from_bcp(address bcp) const;
 716   int validate_bci(int bci) const;
 717 
 718   // Returns the line number for a bci if debugging information for the method is prowided,
 719   // -1 is returned otherwise.
 720   int line_number_from_bci(int bci) const;
 721 
 722   // Reflection support
 723   bool is_overridden_in(Klass* k) const;
 724 
 725   // Stack walking support
 726   bool is_ignored_by_security_stack_walk() const;
 727 
 728   // JSR 292 support
 729   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 730   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 731   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 732   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 733                                                    Symbol* signature, //anything at all
 734                                                    TRAPS);
 735   static Klass* check_non_bcp_klass(Klass* klass);
 736 
 737   enum {
 738     // How many extra stack entries for invokedynamic
 739     extra_stack_entries_for_jsr292 = 1
 740   };
 741 
 742   // this operates only on invoke methods:
 743   // presize interpreter frames for extra interpreter stack entries, if needed
 744   // Account for the extra appendix argument for invokehandle/invokedynamic
 745   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 746   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 747 
 748   // RedefineClasses() support:
 749   bool is_old() const                               { return access_flags().is_old(); }
 750   void set_is_old()                                 { _access_flags.set_is_old(); }
 751   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 752   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 753   bool is_deleted() const                           { return access_flags().is_deleted(); }
 754   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 755 
 756   bool is_running_emcp() const {
 757     // EMCP methods are old but not obsolete or deleted. Equivalent
 758     // Modulo Constant Pool means the method is equivalent except
 759     // the constant pool and instructions that access the constant
 760     // pool might be different.
 761     // If a breakpoint is set in a redefined method, its EMCP methods that are
 762     // still running must have a breakpoint also.
 763     return (_flags & _running_emcp) != 0;
 764   }
 765 
 766   void set_running_emcp(bool x) {
 767     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 768   }
 769 
 770   bool on_stack() const                             { return access_flags().on_stack(); }
 771   void set_on_stack(const bool value);
 772 
 773   // see the definition in Method*.cpp for the gory details
 774   bool should_not_be_cached() const;
 775 
 776   // JVMTI Native method prefixing support:
 777   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 778   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 779 
 780   // Rewriting support
 781   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 782                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 783 
 784   // jmethodID handling
 785   // Because the useful life-span of a jmethodID cannot be determined,
 786   // once created they are never reclaimed.  The methods to which they refer,
 787   // however, can be GC'ed away if the class is unloaded or if the method is
 788   // made obsolete or deleted -- in these cases, the jmethodID
 789   // refers to NULL (as is the case for any weak reference).
 790   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 791   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 792 
 793   // Ensure there is enough capacity in the internal tracking data
 794   // structures to hold the number of jmethodIDs you plan to generate.
 795   // This saves substantial time doing allocations.
 796   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 797 
 798   // Use resolve_jmethod_id() in situations where the caller is expected
 799   // to provide a valid jmethodID; the only sanity checks are in asserts;
 800   // result guaranteed not to be NULL.
 801   inline static Method* resolve_jmethod_id(jmethodID mid) {
 802     assert(mid != NULL, "JNI method id should not be null");
 803     return *((Method**)mid);
 804   }
 805 
 806   // Use checked_resolve_jmethod_id() in situations where the caller
 807   // should provide a valid jmethodID, but might not. NULL is returned
 808   // when the jmethodID does not refer to a valid method.
 809   static Method* checked_resolve_jmethod_id(jmethodID mid);
 810 
 811   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 812   static bool is_method_id(jmethodID mid);
 813 
 814   // Clear methods
 815   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 816   static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 817 
 818   // Get this method's jmethodID -- allocate if it doesn't exist
 819   jmethodID jmethod_id()                            { return InstanceKlass::get_jmethod_id(method_holder(), this); }

 820 
 821   // Lookup the jmethodID for this method.  Return NULL if not found.
 822   // NOTE that this function can be called from a signal handler
 823   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 824   // needs to be async-safe. No allocation should be done and
 825   // so handles are not used to avoid deadlock.
 826   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 827 
 828   // Support for inlining of intrinsic methods
 829   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 830   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 831 
 832   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 833   void init_intrinsic_id();     // updates from _none if a match
 834   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 835 
 836   bool caller_sensitive() {
 837     return (_flags & _caller_sensitive) != 0;
 838   }
 839   void set_caller_sensitive(bool x) {
 840     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 841   }
 842 
 843   bool force_inline() {
 844     return (_flags & _force_inline) != 0;
 845   }
 846   void set_force_inline(bool x) {
 847     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 848   }
 849 
 850   bool dont_inline() {
 851     return (_flags & _dont_inline) != 0;
 852   }
 853   void set_dont_inline(bool x) {
 854     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 855   }
 856 
 857   bool is_hidden() {
 858     return (_flags & _hidden) != 0;
 859   }
 860   void set_hidden(bool x) {
 861     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 862   }
 863 
 864   bool intrinsic_candidate() {
 865     return (_flags & _intrinsic_candidate) != 0;
 866   }
 867   void set_intrinsic_candidate(bool x) {
 868     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 869   }
 870 
 871   bool has_injected_profile() {
 872     return (_flags & _has_injected_profile) != 0;
 873   }
 874   void set_has_injected_profile(bool x) {
 875     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 876   }
 877 
 878   bool has_reserved_stack_access() {
 879     return (_flags & _reserved_stack_access) != 0;
 880   }
 881 
 882   void set_has_reserved_stack_access(bool x) {
 883     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 884   }
 885 
 886   TRACE_DEFINE_FLAG_ACCESSOR;
 887 
 888   ConstMethod::MethodType method_type() const {
 889       return _constMethod->method_type();
 890   }
 891   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 892 
 893   // On-stack replacement support
 894   bool has_osr_nmethod(int level, bool match_level) {
 895    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 896   }
 897 
 898   int mark_osr_nmethods() {
 899     return method_holder()->mark_osr_nmethods(this);
 900   }
 901 
 902   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 903     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 904   }
 905 
 906   // Inline cache support
 907   void cleanup_inline_caches();
 908 
 909   // Find if klass for method is loaded
 910   bool is_klass_loaded_by_klass_index(int klass_index) const;
 911   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 912 
 913   // Indicates whether compilation failed earlier for this method, or
 914   // whether it is not compilable for another reason like having a
 915   // breakpoint set in it.
 916   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 917   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 918   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 919     set_not_compilable(comp_level, false);
 920   }
 921   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 922   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 923   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 924     set_not_osr_compilable(comp_level, false);
 925   }
 926   bool is_always_compilable() const;
 927 
 928  private:
 929   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 930 
 931  public:
 932   MethodCounters* get_method_counters(TRAPS) {
 933     if (_method_counters == NULL) {
 934       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 935     }
 936     return _method_counters;
 937   }
 938 
 939   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 940   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 941   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 942   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 943   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 944   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 945 
 946   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 947   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 948   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 949   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 950   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 951   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 952 
 953   // Background compilation support
 954   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 955   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 956   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 957 
 958   // Resolve all classes in signature, return 'true' if successful
 959   static bool load_signature_classes(methodHandle m, TRAPS);
 960 
 961   // Return if true if not all classes references in signature, including return type, has been loaded
 962   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 963 
 964   // Printing
 965   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 966 #if INCLUDE_JVMTI
 967   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 968 #else
 969   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 970 #endif
 971 
 972   // Helper routine used for method sorting
 973   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
 974 
 975   // Deallocation function for redefine classes or if an error occurs
 976   void deallocate_contents(ClassLoaderData* loader_data);
 977 
 978   // Printing
 979 #ifndef PRODUCT
 980   void print_on(outputStream* st) const;
 981 #endif
 982   void print_value_on(outputStream* st) const;
 983   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
 984 
 985   const char* internal_name() const { return "{method}"; }
 986 
 987   // Check for valid method pointer
 988   static bool has_method_vptr(const void* ptr);
 989   bool is_valid_method() const;
 990 
 991   // Verify
 992   void verify() { verify_on(tty); }
 993   void verify_on(outputStream* st);
 994 
 995  private:
 996 
 997   // Inlined elements
 998   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 999   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1000 };
1001 
1002 
1003 // Utility class for compressing line number tables
1004 
1005 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1006  private:
1007   int _bci;
1008   int _line;
1009  public:
1010   // Constructor
1011   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1012   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1013 
1014   // Write (bci, line number) pair to stream
1015   void write_pair_regular(int bci_delta, int line_delta);
1016 
1017   inline void write_pair_inline(int bci, int line) {
1018     int bci_delta = bci - _bci;
1019     int line_delta = line - _line;
1020     _bci = bci;
1021     _line = line;
1022     // Skip (0,0) deltas - they do not add information and conflict with terminator.
1023     if (bci_delta == 0 && line_delta == 0) return;
1024     // Check if bci is 5-bit and line number 3-bit unsigned.
1025     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1026       // Compress into single byte.
1027       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1028       // Check that value doesn't match escape character.
1029       if (value != 0xFF) {
1030         write_byte(value);
1031         return;
1032       }
1033     }
1034     write_pair_regular(bci_delta, line_delta);
1035   }
1036 
1037 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1038 // Disabling optimization doesn't work for methods in header files
1039 // so we force it to call through the non-optimized version in the .cpp.
1040 // It's gross, but it's the only way we can ensure that all callers are
1041 // fixed.  _MSC_VER is defined by the windows compiler
1042 #if defined(_M_AMD64) && _MSC_VER >= 1400
1043   void write_pair(int bci, int line);
1044 #else
1045   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1046 #endif
1047 
1048   // Write end-of-stream marker
1049   void write_terminator()                        { write_byte(0); }
1050 };
1051 
1052 
1053 // Utility class for decompressing line number tables
1054 
1055 class CompressedLineNumberReadStream: public CompressedReadStream {
1056  private:
1057   int _bci;
1058   int _line;
1059  public:
1060   // Constructor
1061   CompressedLineNumberReadStream(u_char* buffer);
1062   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1063   bool read_pair();
1064   // Accessing bci and line number (after calling read_pair)
1065   int bci() const                               { return _bci; }
1066   int line() const                              { return _line; }
1067 };
1068 
1069 
1070 #if INCLUDE_JVMTI
1071 
1072 /// Fast Breakpoints.
1073 
1074 // If this structure gets more complicated (because bpts get numerous),
1075 // move it into its own header.
1076 
1077 // There is presently no provision for concurrent access
1078 // to breakpoint lists, which is only OK for JVMTI because
1079 // breakpoints are written only at safepoints, and are read
1080 // concurrently only outside of safepoints.
1081 
1082 class BreakpointInfo : public CHeapObj<mtClass> {
1083   friend class VMStructs;
1084  private:
1085   Bytecodes::Code  _orig_bytecode;
1086   int              _bci;
1087   u2               _name_index;       // of method
1088   u2               _signature_index;  // of method
1089   BreakpointInfo*  _next;             // simple storage allocation
1090 
1091  public:
1092   BreakpointInfo(Method* m, int bci);
1093 
1094   // accessors
1095   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1096   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1097   int         bci()                                   { return _bci; }
1098 
1099   BreakpointInfo*          next() const               { return _next; }
1100   void                 set_next(BreakpointInfo* n)    { _next = n; }
1101 
1102   // helps for searchers
1103   bool match(const Method* m, int bci) {
1104     return bci == _bci && match(m);
1105   }
1106 
1107   bool match(const Method* m) {
1108     return _name_index == m->name_index() &&
1109       _signature_index == m->signature_index();
1110   }
1111 
1112   void set(Method* method);
1113   void clear(Method* method);
1114 };
1115 
1116 #endif // INCLUDE_JVMTI
1117 
1118 // Utility class for access exception handlers
1119 class ExceptionTable : public StackObj {
1120  private:
1121   ExceptionTableElement* _table;
1122   u2  _length;
1123 
1124  public:
1125   ExceptionTable(const Method* m) {
1126     if (m->has_exception_handler()) {
1127       _table = m->exception_table_start();
1128       _length = m->exception_table_length();
1129     } else {
1130       _table = NULL;
1131       _length = 0;
1132     }
1133   }
1134 
1135   int length() const {
1136     return _length;
1137   }
1138 
1139   u2 start_pc(int idx) const {
1140     assert(idx < _length, "out of bounds");
1141     return _table[idx].start_pc;
1142   }
1143 
1144   void set_start_pc(int idx, u2 value) {
1145     assert(idx < _length, "out of bounds");
1146     _table[idx].start_pc = value;
1147   }
1148 
1149   u2 end_pc(int idx) const {
1150     assert(idx < _length, "out of bounds");
1151     return _table[idx].end_pc;
1152   }
1153 
1154   void set_end_pc(int idx, u2 value) {
1155     assert(idx < _length, "out of bounds");
1156     _table[idx].end_pc = value;
1157   }
1158 
1159   u2 handler_pc(int idx) const {
1160     assert(idx < _length, "out of bounds");
1161     return _table[idx].handler_pc;
1162   }
1163 
1164   void set_handler_pc(int idx, u2 value) {
1165     assert(idx < _length, "out of bounds");
1166     _table[idx].handler_pc = value;
1167   }
1168 
1169   u2 catch_type_index(int idx) const {
1170     assert(idx < _length, "out of bounds");
1171     return _table[idx].catch_type_index;
1172   }
1173 
1174   void set_catch_type_index(int idx, u2 value) {
1175     assert(idx < _length, "out of bounds");
1176     _table[idx].catch_type_index = value;
1177   }
1178 };
1179 
1180 #endif // SHARE_VM_OOPS_METHODOOP_HPP
--- EOF ---