1 /*
   2  * Copyright (c) 1997, 2019, 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_OOPS_METHOD_HPP
  26 #define SHARE_OOPS_METHOD_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 class InterpreterOopMap;
  70 
  71 class Method : public Metadata {
  72  friend class VMStructs;
  73  friend class JVMCIVMStructs;
  74  private:
  75   // If you add a new field that points to any metaspace object, you
  76   // must add this field to Method::metaspace_pointers_do().
  77   ConstMethod*      _constMethod;                // Method read-only data.
  78   MethodData*       _method_data;
  79   MethodCounters*   _method_counters;
  80   AccessFlags       _access_flags;               // Access flags
  81   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
  82                                                  // note: can have vtables with >2**16 elements (because of inheritance)
  83   u2                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
  84 
  85   // Flags
  86   enum Flags {
  87     _caller_sensitive      = 1 << 0,
  88     _force_inline          = 1 << 1,
  89     _dont_inline           = 1 << 2,
  90     _hidden                = 1 << 3,
  91     _has_injected_profile  = 1 << 4,
  92     _running_emcp          = 1 << 5,
  93     _intrinsic_candidate   = 1 << 6,
  94     _reserved_stack_access = 1 << 7,
  95     _scalarized_args       = 1 << 8,
  96     _needs_stack_repair    = 1 << 9
  97   };
  98   mutable u2 _flags;
  99 
 100   JFR_ONLY(DEFINE_TRACE_FLAG;)
 101 
 102 #ifndef PRODUCT
 103   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 104 #endif
 105   // Entry point for calling both from and to the interpreter.
 106   address _i2i_entry;           // All-args-on-stack calling convention
 107   // Entry point for calling from compiled code, to compiled code if it exists
 108   // or else the interpreter.
 109   volatile address _from_compiled_entry;          // Cache of: _code ? _code->verified_entry_point()          : _adapter->c2i_entry()
 110   volatile address _from_compiled_value_ro_entry; // Cache of: _code ? _code->verified_value_ro_entry_point() : _adapter->c2i_value_ro_entry()
 111   volatile address _from_compiled_value_entry;    // Cache of: _code ? _code->verified_value_entry_point()    : _adapter->c2i_value_entry()
 112   // The entry point for calling both from and to compiled code is
 113   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 114   // field can come and go.  It can transition from NULL to not-null at any
 115   // time (whenever a compile completes).  It can transition from not-null to
 116   // NULL only at safepoints (because of a de-opt).
 117   CompiledMethod* volatile _code;                       // Points to the corresponding piece of native code
 118   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 119   int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
 120 
 121 #if INCLUDE_AOT && defined(TIERED)
 122   CompiledMethod* _aot_code;
 123 #endif
 124 
 125   // Constructor
 126   Method(ConstMethod* xconst, AccessFlags access_flags);
 127  public:
 128 
 129   static Method* allocate(ClassLoaderData* loader_data,
 130                           int byte_code_size,
 131                           AccessFlags access_flags,
 132                           InlineTableSizes* sizes,
 133                           ConstMethod::MethodType method_type,
 134                           TRAPS);
 135 
 136   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
 137   Method(){}
 138 
 139   bool is_method() const volatile { return true; }
 140 
 141   void restore_unshareable_info(TRAPS);
 142 
 143   // accessors for instance variables
 144 
 145   ConstMethod* constMethod() const             { return _constMethod; }
 146   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
 147 
 148 
 149   static address make_adapters(const methodHandle& mh, TRAPS);
 150   address from_compiled_entry() const;
 151   address from_compiled_entry_no_trampoline() const;
 152   address from_interpreted_entry() const;
 153 
 154   // access flag
 155   AccessFlags access_flags() const               { return _access_flags;  }
 156   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 157 
 158   // name
 159   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
 160   int name_index() const                         { return constMethod()->name_index();         }
 161   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 162 
 163   // signature
 164   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
 165   int signature_index() const                    { return constMethod()->signature_index();         }
 166   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 167 
 168   // generics support
 169   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
 170   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 171   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 172 
 173   // annotations support
 174   AnnotationArray* annotations() const           {
 175     return constMethod()->method_annotations();
 176   }
 177   AnnotationArray* parameter_annotations() const {
 178     return constMethod()->parameter_annotations();
 179   }
 180   AnnotationArray* annotation_default() const    {
 181     return constMethod()->default_annotations();
 182   }
 183   AnnotationArray* type_annotations() const      {
 184     return constMethod()->type_annotations();
 185   }
 186 
 187   // Helper routine: get klass name + "." + method name + signature as
 188   // C string, for the purpose of providing more useful
 189   // fatal error handling. The string is allocated in resource
 190   // area if a buffer is not provided by the caller.
 191   char* name_and_sig_as_C_string() const;
 192   char* name_and_sig_as_C_string(char* buf, int size) const;
 193 
 194   // Static routine in the situations we don't have a Method*
 195   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 196   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 197 
 198   // Get return type + klass name + "." + method name + ( parameters types )
 199   // as a C string or print it to an outputStream.
 200   // This is to be used to assemble strings passed to Java, so that
 201   // the text more resembles Java code. Used in exception messages.
 202   // Memory is allocated in the resource area; the caller needs
 203   // a ResourceMark.
 204   const char* external_name() const;
 205   void  print_external_name(outputStream *os) const;
 206 
 207   static const char* external_name(                  Klass* klass, Symbol* method_name, Symbol* signature);
 208   static void  print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
 209 
 210   Bytecodes::Code java_code_at(int bci) const {
 211     return Bytecodes::java_code_at(this, bcp_from(bci));
 212   }
 213   Bytecodes::Code code_at(int bci) const {
 214     return Bytecodes::code_at(this, bcp_from(bci));
 215   }
 216 
 217   // JVMTI breakpoints
 218 #if !INCLUDE_JVMTI
 219   Bytecodes::Code orig_bytecode_at(int bci) const {
 220     ShouldNotReachHere();
 221     return Bytecodes::_shouldnotreachhere;
 222   }
 223   void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
 224     ShouldNotReachHere();
 225   };
 226   u2   number_of_breakpoints() const {return 0;}
 227 #else // !INCLUDE_JVMTI
 228   Bytecodes::Code orig_bytecode_at(int bci) const;
 229   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
 230   void set_breakpoint(int bci);
 231   void clear_breakpoint(int bci);
 232   void clear_all_breakpoints();
 233   // Tracking number of breakpoints, for fullspeed debugging.
 234   // Only mutated by VM thread.
 235   u2   number_of_breakpoints()             const {
 236     MethodCounters* mcs = method_counters();
 237     if (mcs == NULL) {
 238       return 0;
 239     } else {
 240       return mcs->number_of_breakpoints();
 241     }
 242   }
 243   void incr_number_of_breakpoints(TRAPS)         {
 244     MethodCounters* mcs = get_method_counters(CHECK);
 245     if (mcs != NULL) {
 246       mcs->incr_number_of_breakpoints();
 247     }
 248   }
 249   void decr_number_of_breakpoints(TRAPS)         {
 250     MethodCounters* mcs = get_method_counters(CHECK);
 251     if (mcs != NULL) {
 252       mcs->decr_number_of_breakpoints();
 253     }
 254   }
 255   // Initialization only
 256   void clear_number_of_breakpoints()             {
 257     MethodCounters* mcs = method_counters();
 258     if (mcs != NULL) {
 259       mcs->clear_number_of_breakpoints();
 260     }
 261   }
 262 #endif // !INCLUDE_JVMTI
 263 
 264   // index into InstanceKlass methods() array
 265   // note: also used by jfr
 266   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 267   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 268 
 269   u2 orig_method_idnum() const           { return constMethod()->orig_method_idnum(); }
 270   void set_orig_method_idnum(u2 idnum)   { constMethod()->set_orig_method_idnum(idnum); }
 271 
 272   // code size
 273   int code_size() const                  { return constMethod()->code_size(); }
 274 
 275   // method size in words
 276   int method_size() const                { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
 277 
 278   // constant pool for Klass* holding this method
 279   ConstantPool* constants() const              { return constMethod()->constants(); }
 280   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
 281 
 282   // max stack
 283   // return original max stack size for method verification
 284   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
 285   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
 286   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
 287 
 288   // max locals
 289   int  max_locals() const                        { return constMethod()->max_locals(); }
 290   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
 291 
 292   int highest_comp_level() const;
 293   void set_highest_comp_level(int level);
 294   int highest_osr_comp_level() const;
 295   void set_highest_osr_comp_level(int level);
 296 
 297 #if COMPILER2_OR_JVMCI
 298   // Count of times method was exited via exception while interpreting
 299   void interpreter_throwout_increment(TRAPS) {
 300     MethodCounters* mcs = get_method_counters(CHECK);
 301     if (mcs != NULL) {
 302       mcs->interpreter_throwout_increment();
 303     }
 304   }
 305 #endif
 306 
 307   int  interpreter_throwout_count() const        {
 308     MethodCounters* mcs = method_counters();
 309     if (mcs == NULL) {
 310       return 0;
 311     } else {
 312       return mcs->interpreter_throwout_count();
 313     }
 314   }
 315 
 316   // size of parameters
 317   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
 318   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
 319 
 320   bool has_stackmap_table() const {
 321     return constMethod()->has_stackmap_table();
 322   }
 323 
 324   Array<u1>* stackmap_data() const {
 325     return constMethod()->stackmap_data();
 326   }
 327 
 328   void set_stackmap_data(Array<u1>* sd) {
 329     constMethod()->set_stackmap_data(sd);
 330   }
 331 
 332   // exception handler table
 333   bool has_exception_handler() const
 334                              { return constMethod()->has_exception_handler(); }
 335   int exception_table_length() const
 336                              { return constMethod()->exception_table_length(); }
 337   ExceptionTableElement* exception_table_start() const
 338                              { return constMethod()->exception_table_start(); }
 339 
 340   // Finds the first entry point bci of an exception handler for an
 341   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 342   // for ex_klass indicates that the exception klass is not known; in
 343   // this case it matches any constraint class. Returns -1 if the
 344   // exception cannot be handled in this method. The handler
 345   // constraint classes are loaded if necessary. Note that this may
 346   // throw an exception if loading of the constraint classes causes
 347   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 348   // If an exception is thrown, returns the bci of the
 349   // exception handler which caused the exception to be thrown, which
 350   // is needed for proper retries. See, for example,
 351   // InterpreterRuntime::exception_handler_for_exception.
 352   static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
 353 
 354   // method data access
 355   MethodData* method_data() const              {
 356     return _method_data;
 357   }
 358 
 359   void set_method_data(MethodData* data);
 360 
 361   MethodCounters* method_counters() const {
 362     return _method_counters;
 363   }
 364 
 365   void clear_method_counters() {
 366     _method_counters = NULL;
 367   }
 368 
 369   bool init_method_counters(MethodCounters* counters);
 370 
 371 #ifdef TIERED
 372   // We are reusing interpreter_invocation_count as a holder for the previous event count!
 373   // We can do that since interpreter_invocation_count is not used in tiered.
 374   int prev_event_count() const                   {
 375     if (method_counters() == NULL) {
 376       return 0;
 377     } else {
 378       return method_counters()->interpreter_invocation_count();
 379     }
 380   }
 381   void set_prev_event_count(int count) {
 382     MethodCounters* mcs = method_counters();
 383     if (mcs != NULL) {
 384       mcs->set_interpreter_invocation_count(count);
 385     }
 386   }
 387   jlong prev_time() const                        {
 388     MethodCounters* mcs = method_counters();
 389     return mcs == NULL ? 0 : mcs->prev_time();
 390   }
 391   void set_prev_time(jlong time) {
 392     MethodCounters* mcs = method_counters();
 393     if (mcs != NULL) {
 394       mcs->set_prev_time(time);
 395     }
 396   }
 397   float rate() const                             {
 398     MethodCounters* mcs = method_counters();
 399     return mcs == NULL ? 0 : mcs->rate();
 400   }
 401   void set_rate(float rate) {
 402     MethodCounters* mcs = method_counters();
 403     if (mcs != NULL) {
 404       mcs->set_rate(rate);
 405     }
 406   }
 407 
 408 #if INCLUDE_AOT
 409   void set_aot_code(CompiledMethod* aot_code) {
 410     _aot_code = aot_code;
 411   }
 412 
 413   CompiledMethod* aot_code() const {
 414     return _aot_code;
 415   }
 416 #else
 417   CompiledMethod* aot_code() const { return NULL; }
 418 #endif // INCLUDE_AOT
 419 #endif // TIERED
 420 
 421   int nmethod_age() const {
 422     if (method_counters() == NULL) {
 423       return INT_MAX;
 424     } else {
 425       return method_counters()->nmethod_age();
 426     }
 427   }
 428 
 429   int invocation_count();
 430   int backedge_count();
 431 
 432   bool was_executed_more_than(int n);
 433   bool was_never_executed()                      { return !was_executed_more_than(0); }
 434 
 435   static void build_interpreter_method_data(const methodHandle& method, TRAPS);
 436 
 437   static MethodCounters* build_method_counters(Method* m, TRAPS);
 438 
 439   int interpreter_invocation_count() {
 440     if (TieredCompilation) {
 441       return invocation_count();
 442     } else {
 443       MethodCounters* mcs = method_counters();
 444       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
 445     }
 446   }
 447 #if COMPILER2_OR_JVMCI
 448   int increment_interpreter_invocation_count(TRAPS) {
 449     if (TieredCompilation) ShouldNotReachHere();
 450     MethodCounters* mcs = get_method_counters(CHECK_0);
 451     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
 452   }
 453 #endif
 454 
 455 #ifndef PRODUCT
 456   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 457   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 458 #else
 459   // for PrintMethodData in a product build
 460   int  compiled_invocation_count() const         { return 0;  }
 461 #endif // not PRODUCT
 462 
 463   // Clear (non-shared space) pointers which could not be relevant
 464   // if this (shared) method were mapped into another JVM.
 465   void remove_unshareable_info();
 466 
 467   // nmethod/verified compiler entry
 468   address verified_code_entry();
 469   address verified_value_code_entry();
 470   address verified_value_ro_code_entry();
 471   bool check_code() const;      // Not inline to avoid circular ref
 472   CompiledMethod* volatile code() const;
 473   void clear_code(bool acquire_lock = true);    // Clear out any compiled code
 474   static void set_code(const methodHandle& mh, CompiledMethod* code);
 475   void set_adapter_entry(AdapterHandlerEntry* adapter) {
 476     constMethod()->set_adapter_entry(adapter);
 477   }
 478   void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
 479     constMethod()->update_adapter_trampoline(adapter);
 480   }
 481 
 482   address get_i2c_entry();
 483   address get_c2i_entry();
 484   address get_c2i_value_entry();
 485   address get_c2i_unverified_entry();
 486   AdapterHandlerEntry* adapter() const {
 487     return constMethod()->adapter();
 488   }
 489   // setup entry points
 490   void link_method(const methodHandle& method, TRAPS);
 491   // clear entry points. Used by sharing code during dump time
 492   void unlink_method() NOT_CDS_RETURN;
 493 
 494   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
 495   virtual MetaspaceObj::Type type() const { return MethodType; }
 496 
 497   // vtable index
 498   enum VtableIndexFlag {
 499     // Valid vtable indexes are non-negative (>= 0).
 500     // These few negative values are used as sentinels.
 501     itable_index_max        = -10, // first itable index, growing downward
 502     pending_itable_index    = -9,  // itable index will be assigned
 503     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 504     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 505     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 506     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 507   };
 508   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 509   bool has_vtable_index() const                  { return _vtable_index >= 0; }
 510   int  vtable_index() const                      { return _vtable_index; }
 511   void set_vtable_index(int index);
 512   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
 513   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
 514   int  itable_index() const                      { assert(valid_itable_index(), "");
 515                                                    return itable_index_max - _vtable_index; }
 516   void set_itable_index(int index);
 517 
 518   // interpreter entry
 519   address interpreter_entry() const              { return _i2i_entry; }
 520   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 521   void set_interpreter_entry(address entry) {
 522     assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
 523     if (_i2i_entry != entry) {
 524       _i2i_entry = entry;
 525     }
 526     if (_from_interpreted_entry != entry) {
 527       _from_interpreted_entry = entry;
 528     }
 529   }
 530 
 531   // native function (used for native methods only)
 532   enum {
 533     native_bind_event_is_interesting = true
 534   };
 535   address native_function() const                { return *(native_function_addr()); }
 536   address critical_native_function();
 537 
 538   // Must specify a real function (not NULL).
 539   // Use clear_native_function() to unregister.
 540   void set_native_function(address function, bool post_event_flag);
 541   bool has_native_function() const;
 542   void clear_native_function();
 543 
 544   // signature handler (used for native methods only)
 545   address signature_handler() const              { return *(signature_handler_addr()); }
 546   void set_signature_handler(address handler);
 547 
 548   // Interpreter oopmap support
 549   void mask_for(int bci, InterpreterOopMap* mask);
 550 
 551   // operations on invocation counter
 552   void print_invocation_count();
 553 
 554   // byte codes
 555   void    set_code(address code)      { return constMethod()->set_code(code); }
 556   address code_base() const           { return constMethod()->code_base(); }
 557   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 558 
 559   // prints byte codes
 560   void print_codes() const            { print_codes_on(tty); }
 561   void print_codes_on(outputStream* st) const;
 562   void print_codes_on(int from, int to, outputStream* st) const;
 563 
 564   // method parameters
 565   bool has_method_parameters() const
 566                          { return constMethod()->has_method_parameters(); }
 567   int method_parameters_length() const
 568                          { return constMethod()->method_parameters_length(); }
 569   MethodParametersElement* method_parameters_start() const
 570                           { return constMethod()->method_parameters_start(); }
 571 
 572   // checked exceptions
 573   int checked_exceptions_length() const
 574                          { return constMethod()->checked_exceptions_length(); }
 575   CheckedExceptionElement* checked_exceptions_start() const
 576                           { return constMethod()->checked_exceptions_start(); }
 577 
 578   // localvariable table
 579   bool has_localvariable_table() const
 580                           { return constMethod()->has_localvariable_table(); }
 581   int localvariable_table_length() const
 582                         { return constMethod()->localvariable_table_length(); }
 583   LocalVariableTableElement* localvariable_table_start() const
 584                          { return constMethod()->localvariable_table_start(); }
 585 
 586   bool has_linenumber_table() const
 587                               { return constMethod()->has_linenumber_table(); }
 588   u_char* compressed_linenumber_table() const
 589                        { return constMethod()->compressed_linenumber_table(); }
 590 
 591   // method holder (the Klass* holding this method)
 592   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
 593 
 594   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 595   Symbol* klass_name() const;                    // returns the name of the method holder
 596   BasicType result_type() const;                 // type of the method result
 597   bool may_return_oop() const                    { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY ||  r == T_VALUETYPE); }
 598 #ifdef ASSERT
 599   ValueKlass* returned_value_type(Thread* thread) const;
 600 #endif
 601 
 602   // Checked exceptions thrown by this method (resolved to mirrors)
 603   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 604 
 605   // Access flags
 606   bool is_public() const                         { return access_flags().is_public();      }
 607   bool is_private() const                        { return access_flags().is_private();     }
 608   bool is_protected() const                      { return access_flags().is_protected();   }
 609   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 610   bool is_static() const                         { return access_flags().is_static();      }
 611   bool is_final() const                          { return access_flags().is_final();       }
 612   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 613   bool is_native() const                         { return access_flags().is_native();      }
 614   bool is_abstract() const                       { return access_flags().is_abstract();    }
 615   bool is_strict() const                         { return access_flags().is_strict();      }
 616   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 617 
 618   // returns true if contains only return operation
 619   bool is_empty_method() const;
 620 
 621   // returns true if this is a vanilla constructor
 622   bool is_vanilla_constructor() const;
 623 
 624   // checks method and its method holder
 625   bool is_final_method() const;
 626   bool is_final_method(AccessFlags class_access_flags) const;
 627   // interface method declared with 'default' - excludes private interface methods
 628   bool is_default_method() const;
 629 
 630   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 631   bool can_be_statically_bound() const;
 632   bool can_be_statically_bound(AccessFlags class_access_flags) const;
 633 
 634   // returns true if the method has any backward branches.
 635   bool has_loops() {
 636     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 637   };
 638 
 639   bool compute_has_loops_flag();
 640 
 641   bool has_jsrs() {
 642     return access_flags().has_jsrs();
 643   };
 644   void set_has_jsrs() {
 645     _access_flags.set_has_jsrs();
 646   }
 647 
 648   // returns true if the method has any monitors.
 649   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 650   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 651 
 652   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 653 
 654   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 655   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 656   // has not been computed yet.
 657   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 658   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 659 
 660   // returns true if the method is an accessor function (setter/getter).
 661   bool is_accessor() const;
 662 
 663   // returns true if the method is a getter
 664   bool is_getter() const;
 665 
 666   // returns true if the method is a setter
 667   bool is_setter() const;
 668 
 669   // returns true if the method does nothing but return a constant of primitive type
 670   bool is_constant_getter() const;
 671 
 672   // returns true if the method is an initializer (<init> or <clinit>).
 673   bool is_initializer() const;
 674 
 675   // returns true if the method is static OR if the classfile version < 51
 676   bool has_valid_initializer_flags() const;
 677 
 678   // returns true if the method name is <clinit> and the method has
 679   // valid static initializer flags.
 680   bool is_static_initializer() const;
 681 
 682   // returns true if the method name is <init>
 683   bool is_object_initializer() const;
 684 
 685   // compiled code support
 686   // NOTE: code() is inherently racy as deopt can be clearing code
 687   // simultaneously. Use with caution.
 688   bool has_compiled_code() const;
 689 
 690 #ifdef TIERED
 691   bool has_aot_code() const                      { return aot_code() != NULL; }
 692 #endif
 693 
 694   // sizing
 695   static int header_size()                       {
 696     return align_up((int)sizeof(Method), wordSize) / wordSize;
 697   }
 698   static int size(bool is_native);
 699   int size() const                               { return method_size(); }
 700 #if INCLUDE_SERVICES
 701   void collect_statistics(KlassSizeStats *sz) const;
 702 #endif
 703   void log_touched(TRAPS);
 704   static void print_touched_methods(outputStream* out);
 705 
 706   // interpreter support
 707   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
 708   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 709   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
 710   static ByteSize from_compiled_value_offset()   { return byte_offset_of(Method, _from_compiled_value_entry); }
 711   static ByteSize from_compiled_value_ro_offset(){ return byte_offset_of(Method, _from_compiled_value_ro_entry); }
 712   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
 713   static ByteSize flags_offset()                 { return byte_offset_of(Method, _flags); }
 714   static ByteSize method_data_offset()           {
 715     return byte_offset_of(Method, _method_data);
 716   }
 717   static ByteSize method_counters_offset()       {
 718     return byte_offset_of(Method, _method_counters);
 719   }
 720 #ifndef PRODUCT
 721   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 722 #endif // not PRODUCT
 723   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
 724   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
 725   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
 726   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
 727   static ByteSize itable_index_offset()          { return byte_offset_of(Method, _vtable_index ); }
 728 
 729   // for code generation
 730   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
 731   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
 732   static int intrinsic_id_size_in_bytes()        { return sizeof(u2); }
 733 
 734   static ByteSize max_vt_buffer_offset()         { return byte_offset_of(Method, _max_vt_buffer); }
 735 
 736   // Static methods that are used to implement member methods where an exposed this pointer
 737   // is needed due to possible GCs
 738   static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
 739 
 740   // Returns the byte code index from the byte code pointer
 741   int     bci_from(address bcp) const;
 742   address bcp_from(int bci) const;
 743   address bcp_from(address bcp) const;
 744   int validate_bci_from_bcp(address bcp) const;
 745   int validate_bci(int bci) const;
 746 
 747   // Returns the line number for a bci if debugging information for the method is prowided,
 748   // -1 is returned otherwise.
 749   int line_number_from_bci(int bci) const;
 750 
 751   // Reflection support
 752   bool is_overridden_in(Klass* k) const;
 753 
 754   // Stack walking support
 755   bool is_ignored_by_security_stack_walk() const;
 756 
 757   // JSR 292 support
 758   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
 759   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
 760   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
 761   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
 762                                                    Symbol* signature, //anything at all
 763                                                    TRAPS);
 764   static Klass* check_non_bcp_klass(Klass* klass);
 765 
 766   enum {
 767     // How many extra stack entries for invokedynamic
 768     extra_stack_entries_for_jsr292 = 1
 769   };
 770 
 771   // this operates only on invoke methods:
 772   // presize interpreter frames for extra interpreter stack entries, if needed
 773   // Account for the extra appendix argument for invokehandle/invokedynamic
 774   static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
 775   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
 776 
 777   // RedefineClasses() support:
 778   bool is_old() const                               { return access_flags().is_old(); }
 779   void set_is_old()                                 { _access_flags.set_is_old(); }
 780   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 781   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 782   bool is_deleted() const                           { return access_flags().is_deleted(); }
 783   void set_is_deleted()                             { _access_flags.set_is_deleted(); }
 784 
 785   bool is_running_emcp() const {
 786     // EMCP methods are old but not obsolete or deleted. Equivalent
 787     // Modulo Constant Pool means the method is equivalent except
 788     // the constant pool and instructions that access the constant
 789     // pool might be different.
 790     // If a breakpoint is set in a redefined method, its EMCP methods that are
 791     // still running must have a breakpoint also.
 792     return (_flags & _running_emcp) != 0;
 793   }
 794 
 795   void set_running_emcp(bool x) {
 796     _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
 797   }
 798 
 799   bool on_stack() const                             { return access_flags().on_stack(); }
 800   void set_on_stack(const bool value);
 801 
 802   // see the definition in Method*.cpp for the gory details
 803   bool should_not_be_cached() const;
 804 
 805   // JVMTI Native method prefixing support:
 806   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 807   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 808 
 809   // Rewriting support
 810   static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
 811                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 812 
 813   // jmethodID handling
 814   // Because the useful life-span of a jmethodID cannot be determined,
 815   // once created they are never reclaimed.  The methods to which they refer,
 816   // however, can be GC'ed away if the class is unloaded or if the method is
 817   // made obsolete or deleted -- in these cases, the jmethodID
 818   // refers to NULL (as is the case for any weak reference).
 819   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
 820   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
 821 
 822   // Ensure there is enough capacity in the internal tracking data
 823   // structures to hold the number of jmethodIDs you plan to generate.
 824   // This saves substantial time doing allocations.
 825   static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
 826 
 827   // Use resolve_jmethod_id() in situations where the caller is expected
 828   // to provide a valid jmethodID; the only sanity checks are in asserts;
 829   // result guaranteed not to be NULL.
 830   inline static Method* resolve_jmethod_id(jmethodID mid) {
 831     assert(mid != NULL, "JNI method id should not be null");
 832     return *((Method**)mid);
 833   }
 834 
 835   // Use checked_resolve_jmethod_id() in situations where the caller
 836   // should provide a valid jmethodID, but might not. NULL is returned
 837   // when the jmethodID does not refer to a valid method.
 838   static Method* checked_resolve_jmethod_id(jmethodID mid);
 839 
 840   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
 841   static bool is_method_id(jmethodID mid);
 842 
 843   // Clear methods
 844   static void clear_jmethod_ids(ClassLoaderData* loader_data);
 845   static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
 846 
 847   // Get this method's jmethodID -- allocate if it doesn't exist
 848   jmethodID jmethod_id()                            { return method_holder()->get_jmethod_id(this); }
 849 
 850   // Lookup the jmethodID for this method.  Return NULL if not found.
 851   // NOTE that this function can be called from a signal handler
 852   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 853   // needs to be async-safe. No allocation should be done and
 854   // so handles are not used to avoid deadlock.
 855   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
 856 
 857   // Support for inlining of intrinsic methods
 858   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 859   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u2) id; }
 860 
 861   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 862   void init_intrinsic_id();     // updates from _none if a match
 863   static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
 864 
 865   bool caller_sensitive() {
 866     return (_flags & _caller_sensitive) != 0;
 867   }
 868   void set_caller_sensitive(bool x) {
 869     _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
 870   }
 871 
 872   bool force_inline() {
 873     return (_flags & _force_inline) != 0;
 874   }
 875   void set_force_inline(bool x) {
 876     _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
 877   }
 878 
 879   bool dont_inline() {
 880     return (_flags & _dont_inline) != 0;
 881   }
 882   void set_dont_inline(bool x) {
 883     _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
 884   }
 885 
 886   bool is_hidden() {
 887     return (_flags & _hidden) != 0;
 888   }
 889   void set_hidden(bool x) {
 890     _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
 891   }
 892 
 893   bool intrinsic_candidate() {
 894     return (_flags & _intrinsic_candidate) != 0;
 895   }
 896   void set_intrinsic_candidate(bool x) {
 897     _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
 898   }
 899 
 900   bool has_injected_profile() {
 901     return (_flags & _has_injected_profile) != 0;
 902   }
 903   void set_has_injected_profile(bool x) {
 904     _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
 905   }
 906 
 907   bool has_reserved_stack_access() {
 908     return (_flags & _reserved_stack_access) != 0;
 909   }
 910 
 911   void set_has_reserved_stack_access(bool x) {
 912     _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
 913   }
 914 
 915   bool has_scalarized_args() {
 916     return (_flags & _scalarized_args) != 0;
 917   }
 918 
 919   void set_has_scalarized_args(bool x) {
 920     _flags = x ? (_flags | _scalarized_args) : (_flags & ~_scalarized_args);
 921   }
 922 
 923   bool needs_stack_repair() {
 924     return (_flags & _needs_stack_repair) != 0;
 925   }
 926 
 927   void set_needs_stack_repair(bool x) {
 928     _flags = x ? (_flags | _needs_stack_repair) : (_flags & ~_needs_stack_repair);
 929   }
 930 
 931   JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
 932 
 933   ConstMethod::MethodType method_type() const {
 934       return _constMethod->method_type();
 935   }
 936   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
 937 
 938   // On-stack replacement support
 939   bool has_osr_nmethod(int level, bool match_level) {
 940    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 941   }
 942 
 943   int mark_osr_nmethods() {
 944     return method_holder()->mark_osr_nmethods(this);
 945   }
 946 
 947   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 948     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
 949   }
 950 
 951   // Find if klass for method is loaded
 952   bool is_klass_loaded_by_klass_index(int klass_index) const;
 953   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 954 
 955   // Indicates whether compilation failed earlier for this method, or
 956   // whether it is not compilable for another reason like having a
 957   // breakpoint set in it.
 958   bool  is_not_compilable(int comp_level = CompLevel_any) const;
 959   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 960   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 961     set_not_compilable(comp_level, false);
 962   }
 963   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
 964   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
 965   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
 966     set_not_osr_compilable(comp_level, false);
 967   }
 968   bool is_always_compilable() const;
 969 
 970  private:
 971   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
 972 
 973  public:
 974   MethodCounters* get_method_counters(TRAPS) {
 975     if (_method_counters == NULL) {
 976       build_method_counters(this, CHECK_AND_CLEAR_NULL);
 977     }
 978     return _method_counters;
 979   }
 980 
 981   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
 982   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
 983   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
 984   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
 985   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
 986   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
 987 
 988   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
 989   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
 990   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
 991   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
 992   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
 993   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
 994 
 995   // Background compilation support
 996   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 997   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 998   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 999 
1000   // Resolve all classes in signature, return 'true' if successful
1001   static bool load_signature_classes(const methodHandle& m, TRAPS);
1002 
1003   // Return if true if not all classes references in signature, including return type, has been loaded
1004   static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
1005 
1006   // Printing
1007   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
1008 #if INCLUDE_JVMTI
1009   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
1010 #else
1011   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
1012 #endif
1013 
1014   // Helper routine used for method sorting
1015   static void sort_methods(Array<Method*>* methods, bool set_idnums = true);
1016 
1017   // Deallocation function for redefine classes or if an error occurs
1018   void deallocate_contents(ClassLoaderData* loader_data);
1019 
1020   Method* get_new_method() const {
1021     InstanceKlass* holder = method_holder();
1022     Method* new_method = holder->method_with_idnum(orig_method_idnum());
1023 
1024     assert(new_method != NULL, "method_with_idnum() should not be NULL");
1025     assert(this != new_method, "sanity check");
1026     return new_method;
1027   }
1028 
1029   // Printing
1030 #ifndef PRODUCT
1031   void print_on(outputStream* st) const;
1032 #endif
1033   void print_value_on(outputStream* st) const;
1034   void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1035 
1036   const char* internal_name() const { return "{method}"; }
1037 
1038   // Check for valid method pointer
1039   static bool has_method_vptr(const void* ptr);
1040   static bool is_valid_method(const Method* m);
1041 
1042   // Verify
1043   void verify() { verify_on(tty); }
1044   void verify_on(outputStream* st);
1045 
1046  private:
1047 
1048   // Inlined elements
1049   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
1050   address* signature_handler_addr() const        { return native_function_addr() + 1; }
1051 };
1052 
1053 
1054 // Utility class for compressing line number tables
1055 
1056 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1057  private:
1058   int _bci;
1059   int _line;
1060  public:
1061   // Constructor
1062   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1063   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1064 
1065   // Write (bci, line number) pair to stream
1066   void write_pair_regular(int bci_delta, int line_delta);
1067 
1068   // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1069   // we save it as one byte, otherwise we write a 0xFF escape character
1070   // and use regular compression. 0x0 is used as end-of-stream terminator.
1071   void write_pair_inline(int bci, int line);
1072 
1073   void write_pair(int bci, int line);
1074 
1075   // Write end-of-stream marker
1076   void write_terminator()                        { write_byte(0); }
1077 };
1078 
1079 
1080 // Utility class for decompressing line number tables
1081 
1082 class CompressedLineNumberReadStream: public CompressedReadStream {
1083  private:
1084   int _bci;
1085   int _line;
1086  public:
1087   // Constructor
1088   CompressedLineNumberReadStream(u_char* buffer);
1089   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1090   bool read_pair();
1091   // Accessing bci and line number (after calling read_pair)
1092   int bci() const                               { return _bci; }
1093   int line() const                              { return _line; }
1094 };
1095 
1096 
1097 #if INCLUDE_JVMTI
1098 
1099 /// Fast Breakpoints.
1100 
1101 // If this structure gets more complicated (because bpts get numerous),
1102 // move it into its own header.
1103 
1104 // There is presently no provision for concurrent access
1105 // to breakpoint lists, which is only OK for JVMTI because
1106 // breakpoints are written only at safepoints, and are read
1107 // concurrently only outside of safepoints.
1108 
1109 class BreakpointInfo : public CHeapObj<mtClass> {
1110   friend class VMStructs;
1111  private:
1112   Bytecodes::Code  _orig_bytecode;
1113   int              _bci;
1114   u2               _name_index;       // of method
1115   u2               _signature_index;  // of method
1116   BreakpointInfo*  _next;             // simple storage allocation
1117 
1118  public:
1119   BreakpointInfo(Method* m, int bci);
1120 
1121   // accessors
1122   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
1123   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1124   int         bci()                                   { return _bci; }
1125 
1126   BreakpointInfo*          next() const               { return _next; }
1127   void                 set_next(BreakpointInfo* n)    { _next = n; }
1128 
1129   // helps for searchers
1130   bool match(const Method* m, int bci) {
1131     return bci == _bci && match(m);
1132   }
1133 
1134   bool match(const Method* m) {
1135     return _name_index == m->name_index() &&
1136       _signature_index == m->signature_index();
1137   }
1138 
1139   void set(Method* method);
1140   void clear(Method* method);
1141 };
1142 
1143 #endif // INCLUDE_JVMTI
1144 
1145 // Utility class for access exception handlers
1146 class ExceptionTable : public StackObj {
1147  private:
1148   ExceptionTableElement* _table;
1149   u2  _length;
1150 
1151  public:
1152   ExceptionTable(const Method* m) {
1153     if (m->has_exception_handler()) {
1154       _table = m->exception_table_start();
1155       _length = m->exception_table_length();
1156     } else {
1157       _table = NULL;
1158       _length = 0;
1159     }
1160   }
1161 
1162   int length() const {
1163     return _length;
1164   }
1165 
1166   u2 start_pc(int idx) const {
1167     assert(idx < _length, "out of bounds");
1168     return _table[idx].start_pc;
1169   }
1170 
1171   void set_start_pc(int idx, u2 value) {
1172     assert(idx < _length, "out of bounds");
1173     _table[idx].start_pc = value;
1174   }
1175 
1176   u2 end_pc(int idx) const {
1177     assert(idx < _length, "out of bounds");
1178     return _table[idx].end_pc;
1179   }
1180 
1181   void set_end_pc(int idx, u2 value) {
1182     assert(idx < _length, "out of bounds");
1183     _table[idx].end_pc = value;
1184   }
1185 
1186   u2 handler_pc(int idx) const {
1187     assert(idx < _length, "out of bounds");
1188     return _table[idx].handler_pc;
1189   }
1190 
1191   void set_handler_pc(int idx, u2 value) {
1192     assert(idx < _length, "out of bounds");
1193     _table[idx].handler_pc = value;
1194   }
1195 
1196   u2 catch_type_index(int idx) const {
1197     assert(idx < _length, "out of bounds");
1198     return _table[idx].catch_type_index;
1199   }
1200 
1201   void set_catch_type_index(int idx, u2 value) {
1202     assert(idx < _length, "out of bounds");
1203     _table[idx].catch_type_index = value;
1204   }
1205 };
1206 
1207 #endif // SHARE_OOPS_METHOD_HPP