1 /*
   2  * Copyright (c) 1997, 2018, 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/align.hpp"
  41 #include "utilities/growableArray.hpp"
  42 #include "utilities/macros.hpp"
  43 #if INCLUDE_JFR
  44 #include "jfr/support/jfrTraceIdExtension.hpp"
  45 #endif
  46 
  47 
  48 // A Method represents a Java method.
  49 //
  50 // Note that most applications load thousands of methods, so keeping the size of this
  51 // class small has a big impact on footprint.
  52 //
  53 // Note that native_function and signature_handler have to be at fixed offsets
  54 // (required by the interpreter)
  55 //
  56 //  Method embedded field layout (after declared fields):
  57 //   [EMBEDDED native_function       (present only if native) ]
  58 //   [EMBEDDED signature_handler     (present only if native) ]
  59 
  60 class CheckedExceptionElement;
  61 class LocalVariableTableElement;
  62 class AdapterHandlerEntry;
  63 class MethodData;
  64 class MethodCounters;
  65 class ConstMethod;
  66 class InlineTableSizes;
  67 class KlassSizeStats;
  68 class CompiledMethod;
  69 
  70 class Method : public Metadata {
  71  friend class VMStructs;
  72  friend class JVMCIVMStructs;
  73  private:
  74   // If you add a new field that points to any metaspace object, you
  75   // must add this field to Method::metaspace_pointers_do().
  76   ConstMethod*      _constMethod;                // Method read-only data.
  77   MethodData*       _method_data;
  78   MethodCounters*   _method_counters;
  79   AccessFlags       _access_flags;               // Access flags
  80   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  81                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  82   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  83 
  84   // Flags
  85   enum Flags {
  86     _caller_sensitive      = 1 << 0,
  87     _force_inline          = 1 << 1,
  88     _dont_inline           = 1 << 2,
  89     _hidden                = 1 << 3,
  90     _has_injected_profile  = 1 << 4,
  91     _running_emcp          = 1 << 5,
  92     _intrinsic_candidate   = 1 << 6,
  93     _reserved_stack_access = 1 << 7,
  94     _is_returning_vt       = 1 << 8
  95   };
  96   mutable u2 _flags;
  97 
  98   JFR_ONLY(DEFINE_TRACE_FLAG;)
  99 
 100 #ifndef PRODUCT
 101   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 102 #endif
 103   // Entry point for calling both from and to the interpreter.
 104   address _i2i_entry;           // All-args-on-stack calling convention
 105   // Entry point for calling from compiled code, to compiled code if it exists
 106   // or else the interpreter.
 107   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 108   volatile address _from_compiled_value_entry;  // Cache of: _code ? _code->value_entry_point() : _adapter->c2i_entry()
 109   // The entry point for calling both from and to compiled code is
 110   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 111   // field can come and go.  It can transition from NULL to not-null at any
 112   // time (whenever a compile completes).  It can transition from not-null to
 113   // NULL only at safepoints (because of a de-opt).
 114   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 115   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 116   int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
 117 
 118 #if INCLUDE_AOT && defined(TIERED)
 119   CompiledMethod* _aot_code;
 120 #endif
 121 
 122   // Constructor
 123   Method(ConstMethod* xconst, AccessFlags access_flags);
 124  public:
 125 
 126   static Method* allocate(ClassLoaderData* loader_data,
 127                           int byte_code_size,
 128                           AccessFlags access_flags,
 129                           InlineTableSizes* sizes,
 130                           ConstMethod::MethodType method_type,
 131                           TRAPS);
 132 
 133   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 134   Method(){}
 135 
 136   bool is_method() const volatile { return true; }
 137 
 138   void restore_unshareable_info(TRAPS);
 139 
 140   // accessors for instance variables
 141 
 142   ConstMethod* constMethod() const             { return _constMethod; }
 143   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 144 
 145 
 146   static address make_adapters(const methodHandle& mh, TRAPS);
 147   address from_compiled_entry() const;
 148   address from_compiled_entry_no_trampoline() const;
 149   address from_interpreted_entry() const;
 150 
 151   // access flag
 152   AccessFlags access_flags() const               { return _access_flags;  }
 153   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 154 
 155   // name
 156   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 157   int name_index() const                         { return constMethod()->name_index();         }
 158   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 159 
 160   // signature
 161   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 162   int signature_index() const                    { return constMethod()->signature_index();         }
 163   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 164 
 165   // generics support
 166   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 167   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 168   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 169 
 170   // annotations support
 171   AnnotationArray* annotations() const           {
 172     return constMethod()->method_annotations();
 173   }
 174   AnnotationArray* parameter_annotations() const {
 175     return constMethod()->parameter_annotations();
 176   }
 177   AnnotationArray* annotation_default() const    {
 178     return constMethod()->default_annotations();
 179   }
 180   AnnotationArray* type_annotations() const      {
 181     return constMethod()->type_annotations();
 182   }
 183 
 184   // Helper routine: get klass name + "." + method name + signature as
 185   // C string, for the purpose of providing more useful NoSuchMethodErrors
 186   // and fatal error handling. The string is allocated in resource
 187   // area if a buffer is not provided by the caller.
 188   char* name_and_sig_as_C_string() const;
 189   char* name_and_sig_as_C_string(char* buf, int size) const;
 190 
 191   // Static routine in the situations we don't have a Method*
 192   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 193   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 194 
 195   Bytecodes::Code java_code_at(int bci) const {
 196     return Bytecodes::java_code_at(this, bcp_from(bci));
 197   }
 198   Bytecodes::Code code_at(int bci) const {
 199     return Bytecodes::code_at(this, bcp_from(bci));
 200   }
 201 
 202   // JVMTI breakpoints
 203 #if !INCLUDE_JVMTI
 204   Bytecodes::Code orig_bytecode_at(int bci) const {
 205     ShouldNotReachHere();
 206     return Bytecodes::_shouldnotreachhere;
 207   }
 208   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 209     ShouldNotReachHere();
 210   };
 211   u2   number_of_breakpoints() const {return 0;}
 212 #else // !INCLUDE_JVMTI
 213   Bytecodes::Code orig_bytecode_at(int bci) const;
 214   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 215   void set_breakpoint(int bci);
 216   void clear_breakpoint(int bci);
 217   void clear_all_breakpoints();
 218   // Tracking number of breakpoints, for fullspeed debugging.
 219   // Only mutated by VM thread.
 220   u2   number_of_breakpoints()             const {
 221     MethodCounters* mcs = method_counters();
 222     if (mcs == NULL) {
 223       return 0;
 224     } else {
 225       return mcs->number_of_breakpoints();
 226     }
 227   }
 228   void incr_number_of_breakpoints(TRAPS)         {
 229     MethodCounters* mcs = get_method_counters(CHECK);
 230     if (mcs != NULL) {
 231       mcs->incr_number_of_breakpoints();
 232     }
 233   }
 234   void decr_number_of_breakpoints(TRAPS)         {
 235     MethodCounters* mcs = get_method_counters(CHECK);
 236     if (mcs != NULL) {
 237       mcs->decr_number_of_breakpoints();
 238     }
 239   }
 240   // Initialization only
 241   void clear_number_of_breakpoints()             {
 242     MethodCounters* mcs = method_counters();
 243     if (mcs != NULL) {
 244       mcs->clear_number_of_breakpoints();
 245     }
 246   }
 247 #endif // !INCLUDE_JVMTI
 248 
 249   // index into InstanceKlass methods() array
 250   // note: also used by jfr
 251   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 252   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 253 
 254   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 255   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 256 
 257   // code size
 258   int code_size() const                  { return constMethod()->code_size(); }
 259 
 260   // method size in words
 261   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 262 
 263   // constant pool for Klass* holding this method
 264   ConstantPool* constants() const              { return constMethod()->constants(); }
 265   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 266 
 267   // max stack
 268   // return original max stack size for method verification
 269   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 270   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 271   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 272 
 273   // max locals
 274   int  max_locals() const                        { return constMethod()->max_locals(); }
 275   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 276 
 277   // value type buffering
 278   void initialize_max_vt_buffer();
 279   int max_vt_buffer() const                      { return _max_vt_buffer; }
 280   void set_max_vt_buffer(int size)               { _max_vt_buffer = size; }
 281 
 282 
 283   int highest_comp_level() const;
 284   void set_highest_comp_level(int level);
 285   int highest_osr_comp_level() const;
 286   void set_highest_osr_comp_level(int level);
 287 
 288 #if COMPILER2_OR_JVMCI
 289   // Count of times method was exited via exception while interpreting
 290   void interpreter_throwout_increment(TRAPS) {
 291     MethodCounters* mcs = get_method_counters(CHECK);
 292     if (mcs != NULL) {
 293       mcs->interpreter_throwout_increment();
 294     }
 295   }
 296 #endif
 297 
 298   int  interpreter_throwout_count() const        {
 299     MethodCounters* mcs = method_counters();
 300     if (mcs == NULL) {
 301       return 0;
 302     } else {
 303       return mcs->interpreter_throwout_count();
 304     }
 305   }
 306 
 307   // size of parameters
 308   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 309   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 310 
 311   bool has_stackmap_table() const {
 312     return constMethod()->has_stackmap_table();
 313   }
 314 
 315   Array<u1>* stackmap_data() const {
 316     return constMethod()->stackmap_data();
 317   }
 318 
 319   void set_stackmap_data(Array<u1>* sd) {
 320     constMethod()->set_stackmap_data(sd);
 321   }
 322 
 323   // exception handler table
 324   bool has_exception_handler() const
 325                              { return constMethod()->has_exception_handler(); }
 326   int exception_table_length() const
 327                              { return constMethod()->exception_table_length(); }
 328   ExceptionTableElement* exception_table_start() const
 329                              { return constMethod()->exception_table_start(); }
 330 
 331   // Finds the first entry point bci of an exception handler for an
 332   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 333   // for ex_klass indicates that the exception klass is not known; in
 334   // this case it matches any constraint class. Returns -1 if the
 335   // exception cannot be handled in this method. The handler
 336   // constraint classes are loaded if necessary. Note that this may
 337   // throw an exception if loading of the constraint classes causes
 338   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 339   // If an exception is thrown, returns the bci of the
 340   // exception handler which caused the exception to be thrown, which
 341   // is needed for proper retries. See, for example,
 342   // InterpreterRuntime::exception_handler_for_exception.
 343   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 344 
 345   // method data access
 346   MethodData* method_data() const              {
 347     return _method_data;
 348   }
 349 
 350   void set_method_data(MethodData* data);
 351 
 352   MethodCounters* method_counters() const {
 353     return _method_counters;
 354   }
 355 
 356   void clear_method_counters() {
 357     _method_counters = NULL;
 358   }
 359 
 360   bool init_method_counters(MethodCounters* counters);
 361 
 362 #ifdef TIERED
 363   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 364   // We can do that since interpreter_invocation_count is not used in tiered.
 365   int prev_event_count() const                   {
 366     if (method_counters() == NULL) {
 367       return 0;
 368     } else {
 369       return method_counters()->interpreter_invocation_count();
 370     }
 371   }
 372   void set_prev_event_count(int count) {
 373     MethodCounters* mcs = method_counters();
 374     if (mcs != NULL) {
 375       mcs->set_interpreter_invocation_count(count);
 376     }
 377   }
 378   jlong prev_time() const                        {
 379     MethodCounters* mcs = method_counters();
 380     return mcs == NULL ? 0 : mcs->prev_time();
 381   }
 382   void set_prev_time(jlong time) {
 383     MethodCounters* mcs = method_counters();
 384     if (mcs != NULL) {
 385       mcs->set_prev_time(time);
 386     }
 387   }
 388   float rate() const                             {
 389     MethodCounters* mcs = method_counters();
 390     return mcs == NULL ? 0 : mcs->rate();
 391   }
 392   void set_rate(float rate) {
 393     MethodCounters* mcs = method_counters();
 394     if (mcs != NULL) {
 395       mcs->set_rate(rate);
 396     }
 397   }
 398 
 399 #if INCLUDE_AOT
 400   void set_aot_code(CompiledMethod* aot_code) {
 401     _aot_code = aot_code;
 402   }
 403 
 404   CompiledMethod* aot_code() const {
 405     return _aot_code;
 406   }
 407 #else
 408   CompiledMethod* aot_code() const { return NULL; }
 409 #endif // INCLUDE_AOT
 410 #endif // TIERED
 411 
 412   int nmethod_age() const {
 413     if (method_counters() == NULL) {
 414       return INT_MAX;
 415     } else {
 416       return method_counters()->nmethod_age();
 417     }
 418   }
 419 
 420   int invocation_count();
 421   int backedge_count();
 422 
 423   bool was_executed_more_than(int n);
 424   bool was_never_executed()                      { return !was_executed_more_than(0); }
 425 
 426   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 427 
 428   static MethodCounters* build_method_counters(Method* m, TRAPS);
 429 
 430   int interpreter_invocation_count() {
 431     if (TieredCompilation) {
 432       return invocation_count();
 433     } else {
 434       MethodCounters* mcs = method_counters();
 435       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 436     }
 437   }
 438 #if COMPILER2_OR_JVMCI
 439   int increment_interpreter_invocation_count(TRAPS) {
 440     if (TieredCompilation) ShouldNotReachHere();
 441     MethodCounters* mcs = get_method_counters(CHECK_0);
 442     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 443   }
 444 #endif
 445 
 446 #ifndef PRODUCT
 447   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 448   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 449 #else
 450   // for PrintMethodData in a product build
 451   int  compiled_invocation_count() const         { return 0;  }
 452 #endif // not PRODUCT
 453 
 454   // Clear (non-shared space) pointers which could not be relevant
 455   // if this (shared) method were mapped into another JVM.
 456   void remove_unshareable_info();
 457 
 458   // nmethod/verified compiler entry
 459   address verified_code_entry();
 460   bool check_code() const;      // Not inline to avoid circular ref
 461   CompiledMethod* volatile code() const;
 462   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 463   static void set_code(const methodHandle& mh, CompiledMethod* code);
 464   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 465     constMethod()->set_adapter_entry(adapter);
 466   }
 467   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 468     constMethod()->update_adapter_trampoline(adapter);
 469   }
 470 
 471   address get_i2c_entry();
 472   address get_c2i_entry();
 473   address get_c2i_unverified_entry();
 474   AdapterHandlerEntry* adapter() const {
 475     return constMethod()->adapter();
 476   }
 477   // setup entry points
 478   void link_method(const methodHandle& method, TRAPS);
 479   // clear entry points. Used by sharing code during dump time
 480   void unlink_method() NOT_CDS_RETURN;
 481 
 482   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 483   virtual MetaspaceObj::Type type() const { return MethodType; }
 484 
 485   // vtable index
 486   enum VtableIndexFlag {
 487     // Valid vtable indexes are non-negative (>= 0).
 488     // These few negative values are used as sentinels.
 489     itable_index_max        = -10, // first itable index, growing downward
 490     pending_itable_index    = -9,  // itable index will be assigned
 491     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 492     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 493     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 494     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 495   };
 496   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 497   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 498   int  vtable_index() const                      { return _vtable_index; }
 499   void set_vtable_index(int index);
 500   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 501   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 502   int  itable_index() const                      { assert(valid_itable_index(), "");
 503                                                    return itable_index_max - _vtable_index; }
 504   void set_itable_index(int index);
 505 
 506   // interpreter entry
 507   address interpreter_entry() const              { return _i2i_entry; }
 508   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 509   void set_interpreter_entry(address entry) {
 510     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 511     if (_i2i_entry != entry) {
 512       _i2i_entry = entry;
 513     }
 514     if (_from_interpreted_entry != entry) {
 515       _from_interpreted_entry = entry;
 516     }
 517   }
 518 
 519   // native function (used for native methods only)
 520   enum {
 521     native_bind_event_is_interesting = true
 522   };
 523   address native_function() const                { return *(native_function_addr()); }
 524   address critical_native_function();
 525 
 526   // Must specify a real function (not NULL).
 527   // Use clear_native_function() to unregister.
 528   void set_native_function(address function, bool post_event_flag);
 529   bool has_native_function() const;
 530   void clear_native_function();
 531 
 532   // signature handler (used for native methods only)
 533   address signature_handler() const              { return *(signature_handler_addr()); }
 534   void set_signature_handler(address handler);
 535 
 536   // Interpreter oopmap support
 537   void mask_for(int bci, InterpreterOopMap* mask);
 538 
 539   // operations on invocation counter
 540   void print_invocation_count();
 541 
 542   // byte codes
 543   void    set_code(address code)      { return constMethod()->set_code(code); }
 544   address code_base() const           { return constMethod()->code_base(); }
 545   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 546 
 547   // prints byte codes
 548   void print_codes() const            { print_codes_on(tty); }
 549   void print_codes_on(outputStream* st) const;
 550   void print_codes_on(int from, int to, outputStream* st) const;
 551 
 552   // method parameters
 553   bool has_method_parameters() const
 554                          { return constMethod()->has_method_parameters(); }
 555   int method_parameters_length() const
 556                          { return constMethod()->method_parameters_length(); }
 557   MethodParametersElement* method_parameters_start() const
 558                           { return constMethod()->method_parameters_start(); }
 559 
 560   // checked exceptions
 561   int checked_exceptions_length() const
 562                          { return constMethod()->checked_exceptions_length(); }
 563   CheckedExceptionElement* checked_exceptions_start() const
 564                           { return constMethod()->checked_exceptions_start(); }
 565 
 566   // localvariable table
 567   bool has_localvariable_table() const
 568                           { return constMethod()->has_localvariable_table(); }
 569   int localvariable_table_length() const
 570                         { return constMethod()->localvariable_table_length(); }
 571   LocalVariableTableElement* localvariable_table_start() const
 572                          { return constMethod()->localvariable_table_start(); }
 573 
 574   bool has_linenumber_table() const
 575                               { return constMethod()->has_linenumber_table(); }
 576   u_char* compressed_linenumber_table() const
 577                        { return constMethod()->compressed_linenumber_table(); }
 578 
 579   // method holder (the Klass* holding this method)
 580   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 581 
 582   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 583   Symbol* klass_name() const;                    // returns the name of the method holder
 584   BasicType result_type() const;                 // type of the method result
 585   bool may_return_oop() const                    { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY ||  r == T_VALUETYPE); }
 586 #ifdef ASSERT
 587   ValueKlass* returned_value_type(Thread* thread) const;
 588 #endif
 589   bool has_value_args() const;
 590 
 591   // Checked exceptions thrown by this method (resolved to mirrors)
 592   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 593 
 594   // Access flags
 595   bool is_public() const                         { return access_flags().is_public();      }
 596   bool is_private() const                        { return access_flags().is_private();     }
 597   bool is_protected() const                      { return access_flags().is_protected();   }
 598   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 599   bool is_static() const                         { return access_flags().is_static();      }
 600   bool is_final() const                          { return access_flags().is_final();       }
 601   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 602   bool is_native() const                         { return access_flags().is_native();      }
 603   bool is_abstract() const                       { return access_flags().is_abstract();    }
 604   bool is_strict() const                         { return access_flags().is_strict();      }
 605   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 606 
 607   // returns true if contains only return operation
 608   bool is_empty_method() const;
 609 
 610   // returns true if this is a vanilla constructor
 611   bool is_vanilla_constructor() const;
 612 
 613   // checks method and its method holder
 614   bool is_final_method() const;
 615   bool is_final_method(AccessFlags class_access_flags) const;
 616   // interface method declared with 'default' - excludes private interface methods
 617   bool is_default_method() const;
 618 
 619   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 620   bool can_be_statically_bound() const;
 621   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 622 
 623   // returns true if the method has any backward branches.
 624   bool has_loops() {
 625     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 626   };
 627 
 628   bool compute_has_loops_flag();
 629 
 630   bool has_jsrs() {
 631     return access_flags().has_jsrs();
 632   };
 633   void set_has_jsrs() {
 634     _access_flags.set_has_jsrs();
 635   }
 636 
 637   // returns true if the method has any monitors.
 638   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 639   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 640 
 641   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 642 
 643   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 644   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 645   // has not been computed yet.
 646   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 647   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 648 
 649   // returns true if the method is an accessor function (setter/getter).
 650   bool is_accessor() const;
 651 
 652   // returns true if the method is a getter
 653   bool is_getter() const;
 654 
 655   // returns true if the method is a setter
 656   bool is_setter() const;
 657 
 658   // returns true if the method does nothing but return a constant of primitive type
 659   bool is_constant_getter() const;
 660 
 661   // returns true if the method is an initializer (<init> or <clinit>).
 662   bool is_initializer() const;
 663 
 664   // returns true if the method is static OR if the classfile version < 51
 665   bool has_valid_initializer_flags() const;
 666 
 667   // returns true if the method name is <clinit> and the method has
 668   // valid static initializer flags.
 669   bool is_static_initializer() const;
 670 
 671   // returns true if the method name is <init>
 672   bool is_object_initializer() const;
 673 
 674   // compiled code support
 675   // NOTE: code() is inherently racy as deopt can be clearing code
 676   // simultaneously. Use with caution.
 677   bool has_compiled_code() const;
 678 
 679 #ifdef TIERED
 680   bool has_aot_code() const                      { return aot_code() != NULL; }
 681 #endif
 682 
 683   // sizing
 684   static int header_size()                       {
 685     return align_up((int)sizeof(Method), wordSize) / wordSize;
 686   }
 687   static int size(bool is_native);
 688   int size() const                               { return method_size(); }
 689 #if INCLUDE_SERVICES
 690   void collect_statistics(KlassSizeStats *sz) const;
 691 #endif
 692   void log_touched(TRAPS);
 693   static void print_touched_methods(outputStream* out);
 694 
 695   // interpreter support
 696   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 697   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 698   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 699   static ByteSize from_compiled_value_offset()   { return byte_offset_of(Method, _from_compiled_value_entry); }
 700   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 701   static ByteSize flags_offset()                 { return byte_offset_of(Method, _flags); }
 702   static ByteSize method_data_offset()           {
 703     return byte_offset_of(Method, _method_data);
 704   }
 705   static ByteSize method_counters_offset()       {
 706     return byte_offset_of(Method, _method_counters);
 707   }
 708 #ifndef PRODUCT
 709   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 710 #endif // not PRODUCT
 711   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 712   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 713   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 714   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 715   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 716 
 717   // for code generation
 718   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 719   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 720   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 721 
 722   static ByteSize max_vt_buffer_offset()         { return byte_offset_of(Method, _max_vt_buffer); }
 723 
 724   // Static methods that are used to implement member methods where an exposed this pointer
 725   // is needed due to possible GCs
 726   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 727 
 728   // Returns the byte code index from the byte code pointer
 729   int     bci_from(address bcp) const;
 730   address bcp_from(int bci) const;
 731   address bcp_from(address bcp) const;
 732   int validate_bci_from_bcp(address bcp) const;
 733   int validate_bci(int bci) const;
 734 
 735   // Returns the line number for a bci if debugging information for the method is prowided,
 736   // -1 is returned otherwise.
 737   int line_number_from_bci(int bci) const;
 738 
 739   // Reflection support
 740   bool is_overridden_in(Klass* k) const;
 741 
 742   // Stack walking support
 743   bool is_ignored_by_security_stack_walk() const;
 744 
 745   // JSR 292 support
 746   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 747   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 748   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 749   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 750                                                    Symbol* signature, //anything at all
 751                                                    TRAPS);
 752   static Klass* check_non_bcp_klass(Klass* klass);
 753 
 754   enum {
 755     // How many extra stack entries for invokedynamic
 756     extra_stack_entries_for_jsr292 = 1
 757   };
 758 
 759   // this operates only on invoke methods:
 760   // presize interpreter frames for extra interpreter stack entries, if needed
 761   // Account for the extra appendix argument for invokehandle/invokedynamic
 762   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 763   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 764 
 765   // RedefineClasses() support:
 766   bool is_old() const                               { return access_flags().is_old(); }
 767   void set_is_old()                                 { _access_flags.set_is_old(); }
 768   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 769   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 770   bool is_deleted() const                           { return access_flags().is_deleted(); }
 771   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 772 
 773   bool is_running_emcp() const {
 774     // EMCP methods are old but not obsolete or deleted. Equivalent
 775     // Modulo Constant Pool means the method is equivalent except
 776     // the constant pool and instructions that access the constant
 777     // pool might be different.
 778     // If a breakpoint is set in a redefined method, its EMCP methods that are
 779     // still running must have a breakpoint also.
 780     return (_flags & _running_emcp) != 0;
 781   }
 782 
 783   void set_running_emcp(bool x) {
 784     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 785   }
 786 
 787   bool on_stack() const                             { return access_flags().on_stack(); }
 788   void set_on_stack(const bool value);
 789 
 790   // see the definition in Method*.cpp for the gory details
 791   bool should_not_be_cached() const;
 792 
 793   // JVMTI Native method prefixing support:
 794   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 795   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 796 
 797   // Rewriting support
 798   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 799                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 800 
 801   // jmethodID handling
 802   // Because the useful life-span of a jmethodID cannot be determined,
 803   // once created they are never reclaimed.  The methods to which they refer,
 804   // however, can be GC'ed away if the class is unloaded or if the method is
 805   // made obsolete or deleted -- in these cases, the jmethodID
 806   // refers to NULL (as is the case for any weak reference).
 807   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 808   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 809 
 810   // Ensure there is enough capacity in the internal tracking data
 811   // structures to hold the number of jmethodIDs you plan to generate.
 812   // This saves substantial time doing allocations.
 813   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 814 
 815   // Use resolve_jmethod_id() in situations where the caller is expected
 816   // to provide a valid jmethodID; the only sanity checks are in asserts;
 817   // result guaranteed not to be NULL.
 818   inline static Method* resolve_jmethod_id(jmethodID mid) {
 819     assert(mid != NULL, "JNI method id should not be null");
 820     return *((Method**)mid);
 821   }
 822 
 823   // Use checked_resolve_jmethod_id() in situations where the caller
 824   // should provide a valid jmethodID, but might not. NULL is returned
 825   // when the jmethodID does not refer to a valid method.
 826   static Method* checked_resolve_jmethod_id(jmethodID mid);
 827 
 828   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 829   static bool is_method_id(jmethodID mid);
 830 
 831   // Clear methods
 832   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 833   static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 834 
 835   // Get this method's jmethodID -- allocate if it doesn't exist
 836   jmethodID jmethod_id()                            { return method_holder()->get_jmethod_id(this); }
 837 
 838   // Lookup the jmethodID for this method.  Return NULL if not found.
 839   // NOTE that this function can be called from a signal handler
 840   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 841   // needs to be async-safe. No allocation should be done and
 842   // so handles are not used to avoid deadlock.
 843   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 844 
 845   // Support for inlining of intrinsic methods
 846   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 847   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 848 
 849   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 850   void init_intrinsic_id();     // updates from _none if a match
 851   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 852 
 853   bool caller_sensitive() {
 854     return (_flags & _caller_sensitive) != 0;
 855   }
 856   void set_caller_sensitive(bool x) {
 857     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 858   }
 859 
 860   bool force_inline() {
 861     return (_flags & _force_inline) != 0;
 862   }
 863   void set_force_inline(bool x) {
 864     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 865   }
 866 
 867   bool dont_inline() {
 868     return (_flags & _dont_inline) != 0;
 869   }
 870   void set_dont_inline(bool x) {
 871     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 872   }
 873 
 874   bool is_hidden() {
 875     return (_flags & _hidden) != 0;
 876   }
 877   void set_hidden(bool x) {
 878     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 879   }
 880 
 881   bool intrinsic_candidate() {
 882     return (_flags & _intrinsic_candidate) != 0;
 883   }
 884   void set_intrinsic_candidate(bool x) {
 885     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 886   }
 887 
 888   bool has_injected_profile() {
 889     return (_flags & _has_injected_profile) != 0;
 890   }
 891   void set_has_injected_profile(bool x) {
 892     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 893   }
 894 
 895   bool has_reserved_stack_access() {
 896     return (_flags & _reserved_stack_access) != 0;
 897   }
 898 
 899   void set_has_reserved_stack_access(bool x) {
 900     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 901   }
 902 
 903   static int is_returning_vt_mask() {
 904     return _is_returning_vt;
 905   }
 906 
 907   bool is_returning_vt() const {
 908     return (_flags & _is_returning_vt) != 0;
 909   }
 910 
 911   void set_is_returning_vt() {
 912     _flags |= _is_returning_vt;
 913   }
 914 
 915   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 916 
 917   ConstMethod::MethodType method_type() const {
 918       return _constMethod->method_type();
 919   }
 920   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 921 
 922   // On-stack replacement support
 923   bool has_osr_nmethod(int level, bool match_level) {
 924    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 925   }
 926 
 927   int mark_osr_nmethods() {
 928     return method_holder()->mark_osr_nmethods(this);
 929   }
 930 
 931   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 932     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 933   }
 934 
 935   // Find if klass for method is loaded
 936   bool is_klass_loaded_by_klass_index(int klass_index) const;
 937   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 938 
 939   // Indicates whether compilation failed earlier for this method, or
 940   // whether it is not compilable for another reason like having a
 941   // breakpoint set in it.
 942   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 943   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 944   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 945     set_not_compilable(comp_level, false);
 946   }
 947   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 948   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 949   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 950     set_not_osr_compilable(comp_level, false);
 951   }
 952   bool is_always_compilable() const;
 953 
 954  private:
 955   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 956 
 957  public:
 958   MethodCounters* get_method_counters(TRAPS) {
 959     if (_method_counters == NULL) {
 960       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 961     }
 962     return _method_counters;
 963   }
 964 
 965   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 966   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 967   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 968   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 969   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 970   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 971 
 972   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 973   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 974   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 975   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 976   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 977   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 978 
 979   // Background compilation support
 980   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 981   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 982   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 983 
 984   // Resolve all classes in signature, return 'true' if successful
 985   static bool load_signature_classes(const methodHandle& m, TRAPS);
 986 
 987   // Return if true if not all classes references in signature, including return type, has been loaded
 988   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
 989 
 990   // Printing
 991   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 992 #if INCLUDE_JVMTI
 993   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 994 #else
 995   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 996 #endif
 997 
 998   // Helper routine used for method sorting
 999   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
1000 
1001   // Deallocation function for redefine classes or if an error occurs
1002   void deallocate_contents(ClassLoaderData* loader_data);
1003 
1004   // Printing
1005 #ifndef PRODUCT
1006   void print_on(outputStream* st) const;
1007 #endif
1008   void print_value_on(outputStream* st) const;
1009   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1010 
1011   const char* internal_name() const { return "{method}"; }
1012 
1013   // Check for valid method pointer
1014   static bool has_method_vptr(const void* ptr);
1015   static bool is_valid_method(const Method* m);
1016 
1017   // Verify
1018   void verify() { verify_on(tty); }
1019   void verify_on(outputStream* st);
1020 
1021  private:
1022 
1023   // Inlined elements
1024   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1025   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1026 };
1027 
1028 
1029 // Utility class for compressing line number tables
1030 
1031 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1032  private:
1033   int _bci;
1034   int _line;
1035  public:
1036   // Constructor
1037   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1038   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1039 
1040   // Write (bci, line number) pair to stream
1041   void write_pair_regular(int bci_delta, int line_delta);
1042 
1043   inline void write_pair_inline(int bci, int line) {
1044     int bci_delta = bci - _bci;
1045     int line_delta = line - _line;
1046     _bci = bci;
1047     _line = line;
1048     // Skip (0,0) deltas - they do not add information and conflict with terminator.
1049     if (bci_delta == 0 && line_delta == 0) return;
1050     // Check if bci is 5-bit and line number 3-bit unsigned.
1051     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1052       // Compress into single byte.
1053       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1054       // Check that value doesn't match escape character.
1055       if (value != 0xFF) {
1056         write_byte(value);
1057         return;
1058       }
1059     }
1060     write_pair_regular(bci_delta, line_delta);
1061   }
1062 
1063 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1064 // Disabling optimization doesn't work for methods in header files
1065 // so we force it to call through the non-optimized version in the .cpp.
1066 // It's gross, but it's the only way we can ensure that all callers are
1067 // fixed.  _MSC_VER is defined by the windows compiler
1068 #if defined(_M_AMD64) && _MSC_VER >= 1400
1069   void write_pair(int bci, int line);
1070 #else
1071   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1072 #endif
1073 
1074   // Write end-of-stream marker
1075   void write_terminator()                        { write_byte(0); }
1076 };
1077 
1078 
1079 // Utility class for decompressing line number tables
1080 
1081 class CompressedLineNumberReadStream: public CompressedReadStream {
1082  private:
1083   int _bci;
1084   int _line;
1085  public:
1086   // Constructor
1087   CompressedLineNumberReadStream(u_char* buffer);
1088   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1089   bool read_pair();
1090   // Accessing bci and line number (after calling read_pair)
1091   int bci() const                               { return _bci; }
1092   int line() const                              { return _line; }
1093 };
1094 
1095 
1096 #if INCLUDE_JVMTI
1097 
1098 /// Fast Breakpoints.
1099 
1100 // If this structure gets more complicated (because bpts get numerous),
1101 // move it into its own header.
1102 
1103 // There is presently no provision for concurrent access
1104 // to breakpoint lists, which is only OK for JVMTI because
1105 // breakpoints are written only at safepoints, and are read
1106 // concurrently only outside of safepoints.
1107 
1108 class BreakpointInfo : public CHeapObj<mtClass> {
1109   friend class VMStructs;
1110  private:
1111   Bytecodes::Code  _orig_bytecode;
1112   int              _bci;
1113   u2               _name_index;       // of method
1114   u2               _signature_index;  // of method
1115   BreakpointInfo*  _next;             // simple storage allocation
1116 
1117  public:
1118   BreakpointInfo(Method* m, int bci);
1119 
1120   // accessors
1121   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1122   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1123   int         bci()                                   { return _bci; }
1124 
1125   BreakpointInfo*          next() const               { return _next; }
1126   void                 set_next(BreakpointInfo* n)    { _next = n; }
1127 
1128   // helps for searchers
1129   bool match(const Method* m, int bci) {
1130     return bci == _bci && match(m);
1131   }
1132 
1133   bool match(const Method* m) {
1134     return _name_index == m->name_index() &&
1135       _signature_index == m->signature_index();
1136   }
1137 
1138   void set(Method* method);
1139   void clear(Method* method);
1140 };
1141 
1142 #endif // INCLUDE_JVMTI
1143 
1144 // Utility class for access exception handlers
1145 class ExceptionTable : public StackObj {
1146  private:
1147   ExceptionTableElement* _table;
1148   u2  _length;
1149 
1150  public:
1151   ExceptionTable(const Method* m) {
1152     if (m->has_exception_handler()) {
1153       _table = m->exception_table_start();
1154       _length = m->exception_table_length();
1155     } else {
1156       _table = NULL;
1157       _length = 0;
1158     }
1159   }
1160 
1161   int length() const {
1162     return _length;
1163   }
1164 
1165   u2 start_pc(int idx) const {
1166     assert(idx < _length, "out of bounds");
1167     return _table[idx].start_pc;
1168   }
1169 
1170   void set_start_pc(int idx, u2 value) {
1171     assert(idx < _length, "out of bounds");
1172     _table[idx].start_pc = value;
1173   }
1174 
1175   u2 end_pc(int idx) const {
1176     assert(idx < _length, "out of bounds");
1177     return _table[idx].end_pc;
1178   }
1179 
1180   void set_end_pc(int idx, u2 value) {
1181     assert(idx < _length, "out of bounds");
1182     _table[idx].end_pc = value;
1183   }
1184 
1185   u2 handler_pc(int idx) const {
1186     assert(idx < _length, "out of bounds");
1187     return _table[idx].handler_pc;
1188   }
1189 
1190   void set_handler_pc(int idx, u2 value) {
1191     assert(idx < _length, "out of bounds");
1192     _table[idx].handler_pc = value;
1193   }
1194 
1195   u2 catch_type_index(int idx) const {
1196     assert(idx < _length, "out of bounds");
1197     return _table[idx].catch_type_index;
1198   }
1199 
1200   void set_catch_type_index(int idx, u2 value) {
1201     assert(idx < _length, "out of bounds");
1202     _table[idx].catch_type_index = value;
1203   }
1204 };
1205 
1206 #endif // SHARE_VM_OOPS_METHODOOP_HPP