1 /*
   2  * Copyright (c) 1997, 2015, 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_INSTANCEKLASS_HPP
  26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
  27 
  28 #include "classfile/classLoaderData.hpp"
  29 #include "memory/referenceType.hpp"
  30 #include "oops/annotations.hpp"
  31 #include "oops/constMethod.hpp"
  32 #include "oops/fieldInfo.hpp"
  33 #include "oops/instanceOop.hpp"
  34 #include "oops/klassVtable.hpp"
  35 #include "runtime/handles.hpp"
  36 #include "runtime/os.hpp"
  37 #include "utilities/accessFlags.hpp"
  38 #include "utilities/bitMap.inline.hpp"
  39 #include "utilities/macros.hpp"
  40 #include "trace/traceMacros.hpp"
  41 
  42 // An InstanceKlass is the VM level representation of a Java class.
  43 // It contains all information needed for at class at execution runtime.
  44 
  45 //  InstanceKlass embedded field layout (after declared fields):
  46 //    [EMBEDDED Java vtable             ] size in words = vtable_len
  47 //    [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
  48 //      The embedded nonstatic oop-map blocks are short pairs (offset, length)
  49 //      indicating where oops are located in instances of this klass.
  50 //    [EMBEDDED implementor of the interface] only exist for interface
  51 //    [EMBEDDED host klass        ] only exist for an anonymous class (JSR 292 enabled)
  52 
  53 
  54 // forward declaration for class -- see below for definition
  55 class SuperTypeClosure;
  56 class JNIid;
  57 class jniIdMapBase;
  58 class BreakpointInfo;
  59 class fieldDescriptor;
  60 class DepChange;
  61 class nmethodBucket;
  62 class JvmtiCachedClassFieldMap;
  63 class MemberNameTable;
  64 
  65 // This is used in iterators below.
  66 class FieldClosure: public StackObj {
  67 public:
  68   virtual void do_field(fieldDescriptor* fd) = 0;
  69 };
  70 
  71 #ifndef PRODUCT
  72 // Print fields.
  73 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
  74 class FieldPrinter: public FieldClosure {
  75    oop _obj;
  76    outputStream* _st;
  77  public:
  78    FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
  79    void do_field(fieldDescriptor* fd);
  80 };
  81 #endif  // !PRODUCT
  82 
  83 // ValueObjs embedded in klass. Describes where oops are located in instances of
  84 // this klass.
  85 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
  86  public:
  87   // Byte offset of the first oop mapped by this block.
  88   int offset() const          { return _offset; }
  89   void set_offset(int offset) { _offset = offset; }
  90 
  91   // Number of oops in this block.
  92   uint count() const         { return _count; }
  93   void set_count(uint count) { _count = count; }
  94 
  95   // sizeof(OopMapBlock) in HeapWords.
  96   static const int size_in_words() {
  97     return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
  98       LogHeapWordSize;
  99   }
 100 
 101  private:
 102   int  _offset;
 103   uint _count;
 104 };
 105 
 106 struct JvmtiCachedClassFileData;
 107 
 108 class InstanceKlass: public Klass {
 109   friend class VMStructs;
 110   friend class ClassFileParser;
 111   friend class CompileReplay;
 112 
 113  protected:
 114   // Constructor
 115   InstanceKlass(int vtable_len,
 116                 int itable_len,
 117                 int static_field_size,
 118                 int nonstatic_oop_map_size,
 119                 ReferenceType rt,
 120                 AccessFlags access_flags,
 121                 bool is_anonymous);
 122  public:
 123   static InstanceKlass* allocate_instance_klass(
 124                                           ClassLoaderData* loader_data,
 125                                           int vtable_len,
 126                                           int itable_len,
 127                                           int static_field_size,
 128                                           int nonstatic_oop_map_size,
 129                                           ReferenceType rt,
 130                                           AccessFlags access_flags,
 131                                           Symbol* name,
 132                                           Klass* super_klass,
 133                                           bool is_anonymous,
 134                                           TRAPS);
 135 
 136   InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
 137 
 138   // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
 139   // of the class loading & initialization procedure, and the use of the states.
 140   enum ClassState {
 141     allocated,                          // allocated (but not yet linked)
 142     loaded,                             // loaded and inserted in class hierarchy (but not linked yet)
 143     linked,                             // successfully linked/verified (but not initialized yet)
 144     being_initialized,                  // currently running class initializer
 145     fully_initialized,                  // initialized (successfull final state)
 146     initialization_error                // error happened during initialization
 147   };
 148 
 149   static int number_of_instance_classes() { return _total_instanceKlass_count; }
 150 
 151  private:
 152   static volatile int _total_instanceKlass_count;
 153 
 154  protected:
 155   // Annotations for this class
 156   Annotations*    _annotations;
 157   // Array classes holding elements of this class.
 158   Klass*          _array_klasses;
 159   // Constant pool for this class.
 160   ConstantPool* _constants;
 161   // The InnerClasses attribute and EnclosingMethod attribute. The
 162   // _inner_classes is an array of shorts. If the class has InnerClasses
 163   // attribute, then the _inner_classes array begins with 4-tuples of shorts
 164   // [inner_class_info_index, outer_class_info_index,
 165   // inner_name_index, inner_class_access_flags] for the InnerClasses
 166   // attribute. If the EnclosingMethod attribute exists, it occupies the
 167   // last two shorts [class_index, method_index] of the array. If only
 168   // the InnerClasses attribute exists, the _inner_classes array length is
 169   // number_of_inner_classes * 4. If the class has both InnerClasses
 170   // and EnclosingMethod attributes the _inner_classes array length is
 171   // number_of_inner_classes * 4 + enclosing_method_attribute_size.
 172   Array<jushort>* _inner_classes;
 173 
 174   // the source debug extension for this klass, NULL if not specified.
 175   // Specified as UTF-8 string without terminating zero byte in the classfile,
 176   // it is stored in the instanceklass as a NULL-terminated UTF-8 string
 177   char*           _source_debug_extension;
 178   // Array name derived from this class which needs unreferencing
 179   // if this class is unloaded.
 180   Symbol*         _array_name;
 181 
 182   // Number of heapOopSize words used by non-static fields in this klass
 183   // (including inherited fields but after header_size()).
 184   int             _nonstatic_field_size;
 185   int             _static_field_size;    // number words used by static fields (oop and non-oop) in this klass
 186   // Constant pool index to the utf8 entry of the Generic signature,
 187   // or 0 if none.
 188   u2              _generic_signature_index;
 189   // Constant pool index to the utf8 entry for the name of source file
 190   // containing this klass, 0 if not specified.
 191   u2              _source_file_name_index;
 192   u2              _static_oop_field_count;// number of static oop fields in this klass
 193   u2              _java_fields_count;    // The number of declared Java fields
 194   int             _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
 195 
 196   // _is_marked_dependent can be set concurrently, thus cannot be part of the
 197   // _misc_flags.
 198   bool            _is_marked_dependent;  // used for marking during flushing and deoptimization
 199   bool            _has_unloaded_dependent;
 200 
 201   enum {
 202     _misc_rewritten                = 1 << 0, // methods rewritten.
 203     _misc_has_nonstatic_fields     = 1 << 1, // for sizing with UseCompressedOops
 204     _misc_should_verify_class      = 1 << 2, // allow caching of preverification
 205     _misc_is_anonymous             = 1 << 3, // has embedded _host_klass field
 206     _misc_is_contended             = 1 << 4, // marked with contended annotation
 207     _misc_has_default_methods      = 1 << 5, // class/superclass/implemented interfaces has default methods
 208     _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
 209     _misc_has_been_redefined       = 1 << 7  // class has been redefined
 210   };
 211   u2              _misc_flags;
 212   u2              _minor_version;        // minor version number of class file
 213   u2              _major_version;        // major version number of class file
 214   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
 215   int             _vtable_len;           // length of Java vtable (in words)
 216   int             _itable_len;           // length of Java itable (in words)
 217   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
 218   MemberNameTable* _member_names;        // Member names
 219   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
 220   jmethodID*      _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
 221   nmethodBucket*  _dependencies;         // list of dependent nmethods
 222   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
 223   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
 224   // Linked instanceKlasses of previous versions
 225   InstanceKlass* _previous_versions;
 226   // JVMTI fields can be moved to their own structure - see 6315920
 227   // JVMTI: cached class file, before retransformable agent modified it in CFLH
 228   JvmtiCachedClassFileData* _cached_class_file;
 229 
 230   volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
 231 
 232   // Class states are defined as ClassState (see above).
 233   // Place the _init_state here to utilize the unused 2-byte after
 234   // _idnum_allocated_count.
 235   u1              _init_state;                    // state of class
 236   u1              _reference_type;                // reference type
 237 
 238   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
 239 
 240   NOT_PRODUCT(int _verify_count;)  // to avoid redundant verifies
 241 
 242   // Method array.
 243   Array<Method*>* _methods;
 244   // Default Method Array, concrete methods inherited from interfaces
 245   Array<Method*>* _default_methods;
 246   // Interface (Klass*s) this class declares locally to implement.
 247   Array<Klass*>* _local_interfaces;
 248   // Interface (Klass*s) this class implements transitively.
 249   Array<Klass*>* _transitive_interfaces;
 250   // Int array containing the original order of method in the class file (for JVMTI).
 251   Array<int>*     _method_ordering;
 252   // Int array containing the vtable_indices for default_methods
 253   // offset matches _default_methods offset
 254   Array<int>*     _default_vtable_indices;
 255 
 256   // Instance and static variable information, starts with 6-tuples of shorts
 257   // [access, name index, sig index, initval index, low_offset, high_offset]
 258   // for all fields, followed by the generic signature data at the end of
 259   // the array. Only fields with generic signature attributes have the generic
 260   // signature data set in the array. The fields array looks like following:
 261   //
 262   // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
 263   // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
 264   //      ...
 265   // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
 266   //     [generic signature index]
 267   //     [generic signature index]
 268   //     ...
 269   Array<u2>*      _fields;
 270 
 271   // embedded Java vtable follows here
 272   // embedded Java itables follows here
 273   // embedded static fields follows here
 274   // embedded nonstatic oop-map blocks follows here
 275   // embedded implementor of this interface follows here
 276   //   The embedded implementor only exists if the current klass is an
 277   //   iterface. The possible values of the implementor fall into following
 278   //   three cases:
 279   //     NULL: no implementor.
 280   //     A Klass* that's not itself: one implementor.
 281   //     Itself: more than one implementors.
 282   // embedded host klass follows here
 283   //   The embedded host klass only exists in an anonymous class for
 284   //   dynamic language support (JSR 292 enabled). The host class grants
 285   //   its access privileges to this class also. The host class is either
 286   //   named, or a previously loaded anonymous class. A non-anonymous class
 287   //   or an anonymous class loaded through normal classloading does not
 288   //   have this embedded field.
 289   //
 290 
 291   friend class SystemDictionary;
 292 
 293  public:
 294   bool has_nonstatic_fields() const        {
 295     return (_misc_flags & _misc_has_nonstatic_fields) != 0;
 296   }
 297   void set_has_nonstatic_fields(bool b)    {
 298     if (b) {
 299       _misc_flags |= _misc_has_nonstatic_fields;
 300     } else {
 301       _misc_flags &= ~_misc_has_nonstatic_fields;
 302     }
 303   }
 304 
 305   // field sizes
 306   int nonstatic_field_size() const         { return _nonstatic_field_size; }
 307   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
 308 
 309   int static_field_size() const            { return _static_field_size; }
 310   void set_static_field_size(int size)     { _static_field_size = size; }
 311 
 312   int static_oop_field_count() const       { return (int)_static_oop_field_count; }
 313   void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
 314 
 315   // Java vtable
 316   int  vtable_length() const               { return _vtable_len; }
 317   void set_vtable_length(int len)          { _vtable_len = len; }
 318 
 319   // Java itable
 320   int  itable_length() const               { return _itable_len; }
 321   void set_itable_length(int len)          { _itable_len = len; }
 322 
 323   // array klasses
 324   Klass* array_klasses() const             { return _array_klasses; }
 325   void set_array_klasses(Klass* k)         { _array_klasses = k; }
 326 
 327   // methods
 328   Array<Method*>* methods() const          { return _methods; }
 329   void set_methods(Array<Method*>* a)      { _methods = a; }
 330   Method* method_with_idnum(int idnum);
 331 
 332   // method ordering
 333   Array<int>* method_ordering() const     { return _method_ordering; }
 334   void set_method_ordering(Array<int>* m) { _method_ordering = m; }
 335   void copy_method_ordering(intArray* m, TRAPS);
 336 
 337   // default_methods
 338   Array<Method*>* default_methods() const  { return _default_methods; }
 339   void set_default_methods(Array<Method*>* a) { _default_methods = a; }
 340 
 341   // default method vtable_indices
 342   Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
 343   void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
 344   Array<int>* create_new_default_vtable_indices(int len, TRAPS);
 345 
 346   // interfaces
 347   Array<Klass*>* local_interfaces() const          { return _local_interfaces; }
 348   void set_local_interfaces(Array<Klass*>* a)      {
 349     guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
 350     _local_interfaces = a; }
 351 
 352   Array<Klass*>* transitive_interfaces() const     { return _transitive_interfaces; }
 353   void set_transitive_interfaces(Array<Klass*>* a) {
 354     guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
 355     _transitive_interfaces = a;
 356   }
 357 
 358  private:
 359   friend class fieldDescriptor;
 360   FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
 361 
 362  public:
 363   int     field_offset      (int index) const { return field(index)->offset(); }
 364   int     field_access_flags(int index) const { return field(index)->access_flags(); }
 365   Symbol* field_name        (int index) const { return field(index)->name(constants()); }
 366   Symbol* field_signature   (int index) const { return field(index)->signature(constants()); }
 367 
 368   // Number of Java declared fields
 369   int java_fields_count() const           { return (int)_java_fields_count; }
 370 
 371   Array<u2>* fields() const            { return _fields; }
 372   void set_fields(Array<u2>* f, u2 java_fields_count) {
 373     guarantee(_fields == NULL || f == NULL, "Just checking");
 374     _fields = f;
 375     _java_fields_count = java_fields_count;
 376   }
 377 
 378   // inner classes
 379   Array<u2>* inner_classes() const       { return _inner_classes; }
 380   void set_inner_classes(Array<u2>* f)   { _inner_classes = f; }
 381 
 382   enum InnerClassAttributeOffset {
 383     // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
 384     inner_class_inner_class_info_offset = 0,
 385     inner_class_outer_class_info_offset = 1,
 386     inner_class_inner_name_offset = 2,
 387     inner_class_access_flags_offset = 3,
 388     inner_class_next_offset = 4
 389   };
 390 
 391   enum EnclosingMethodAttributeOffset {
 392     enclosing_method_class_index_offset = 0,
 393     enclosing_method_method_index_offset = 1,
 394     enclosing_method_attribute_size = 2
 395   };
 396 
 397   // method override check
 398   bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
 399 
 400   // package
 401   bool is_same_class_package(Klass* class2);
 402   bool is_same_class_package(oop classloader2, Symbol* classname2);
 403   static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
 404 
 405   // find an enclosing class (defined where original code was, in jvm.cpp!)
 406   Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
 407     instanceKlassHandle self(THREAD, this);
 408     return compute_enclosing_class_impl(self, inner_is_member, THREAD);
 409   }
 410   static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
 411                                                bool* inner_is_member, TRAPS);
 412 
 413   // tell if two classes have the same enclosing class (at package level)
 414   bool is_same_package_member(Klass* class2, TRAPS) {
 415     instanceKlassHandle self(THREAD, this);
 416     return is_same_package_member_impl(self, class2, THREAD);
 417   }
 418   static bool is_same_package_member_impl(instanceKlassHandle self,
 419                                           Klass* class2, TRAPS);
 420 
 421   // initialization state
 422   bool is_loaded() const                   { return _init_state >= loaded; }
 423   bool is_linked() const                   { return _init_state >= linked; }
 424   bool is_initialized() const              { return _init_state == fully_initialized; }
 425   bool is_not_initialized() const          { return _init_state <  being_initialized; }
 426   bool is_being_initialized() const        { return _init_state == being_initialized; }
 427   bool is_in_error_state() const           { return _init_state == initialization_error; }
 428   bool is_reentrant_initialization(Thread *thread)  { return thread == _init_thread; }
 429   ClassState  init_state()                 { return (ClassState)_init_state; }
 430   bool is_rewritten() const                { return (_misc_flags & _misc_rewritten) != 0; }
 431 
 432   // defineClass specified verification
 433   bool should_verify_class() const         {
 434     return (_misc_flags & _misc_should_verify_class) != 0;
 435   }
 436   void set_should_verify_class(bool value) {
 437     if (value) {
 438       _misc_flags |= _misc_should_verify_class;
 439     } else {
 440       _misc_flags &= ~_misc_should_verify_class;
 441     }
 442   }
 443 
 444   // marking
 445   bool is_marked_dependent() const         { return _is_marked_dependent; }
 446   void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
 447 
 448   bool has_unloaded_dependent() const         { return _has_unloaded_dependent; }
 449   void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
 450 
 451   // initialization (virtuals from Klass)
 452   bool should_be_initialized() const;  // means that initialize should be called
 453   void initialize(TRAPS);
 454   void link_class(TRAPS);
 455   bool link_class_or_fail(TRAPS); // returns false on failure
 456   void unlink_class();
 457   void rewrite_class(TRAPS);
 458   void link_methods(TRAPS);
 459   Method* class_initializer();
 460 
 461   // set the class to initialized if no static initializer is present
 462   void eager_initialize(Thread *thread);
 463 
 464   // reference type
 465   ReferenceType reference_type() const     { return (ReferenceType)_reference_type; }
 466   void set_reference_type(ReferenceType t) {
 467     assert(t == (u1)t, "overflow");
 468     _reference_type = (u1)t;
 469   }
 470 
 471   static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
 472 
 473   // find local field, returns true if found
 474   bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 475   // find field in direct superinterfaces, returns the interface in which the field is defined
 476   Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 477   // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 478   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 479   // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 480   Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
 481 
 482   // find a non-static or static field given its offset within the class.
 483   bool contains_field_offset(int offset) {
 484     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 485   }
 486 
 487   bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 488   bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 489 
 490   // find a local method (returns NULL if not found)
 491   Method* find_method(Symbol* name, Symbol* signature) const;
 492   static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
 493 
 494   // find a local method, but skip static methods
 495   Method* find_instance_method(Symbol* name, Symbol* signature);
 496   static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
 497 
 498   // true if method matches signature and conforms to skipping_X conditions.
 499   static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static);
 500 
 501   // find a local method index in default_methods (returns -1 if not found)
 502   static int find_method_index(Array<Method*>* methods, Symbol* name, Symbol* signature,
 503                                OverpassLookupMode overpass_mode, StaticLookupMode static_mode);
 504 
 505   // lookup operation (returns NULL if not found)
 506   Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
 507 
 508   // lookup a method in all the interfaces that this class implements
 509   // (returns NULL if not found)
 510   Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
 511 
 512   // lookup a method in local defaults then in all interfaces
 513   // (returns NULL if not found)
 514   Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
 515 
 516   // Find method indices by name.  If a method with the specified name is
 517   // found the index to the first method is returned, and 'end' is filled in
 518   // with the index of first non-name-matching method.  If no method is found
 519   // -1 is returned.
 520   int find_method_by_name(Symbol* name, int* end);
 521   static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
 522 
 523   // constant pool
 524   ConstantPool* constants() const        { return _constants; }
 525   void set_constants(ConstantPool* c)    { _constants = c; }
 526 
 527   // protection domain
 528   oop protection_domain() const;
 529 
 530   // signers
 531   objArrayOop signers() const;
 532 
 533   // host class
 534   Klass* host_klass() const              {
 535     Klass** hk = (Klass**)adr_host_klass();
 536     if (hk == NULL) {
 537       return NULL;
 538     } else {
 539       assert(*hk != NULL, "host klass should always be set if the address is not null");
 540       return *hk;
 541     }
 542   }
 543   void set_host_klass(Klass* host)            {
 544     assert(is_anonymous(), "not anonymous");
 545     Klass** addr = (Klass**)adr_host_klass();
 546     assert(addr != NULL, "no reversed space");
 547     if (addr != NULL) {
 548       *addr = host;
 549     }
 550   }
 551   bool is_anonymous() const                {
 552     return (_misc_flags & _misc_is_anonymous) != 0;
 553   }
 554   void set_is_anonymous(bool value)        {
 555     if (value) {
 556       _misc_flags |= _misc_is_anonymous;
 557     } else {
 558       _misc_flags &= ~_misc_is_anonymous;
 559     }
 560   }
 561 
 562   // Oop that keeps the metadata for this class from being unloaded
 563   // in places where the metadata is stored in other places, like nmethods
 564   oop klass_holder() const {
 565     return is_anonymous() ? java_mirror() : class_loader();
 566   }
 567 
 568   bool is_contended() const                {
 569     return (_misc_flags & _misc_is_contended) != 0;
 570   }
 571   void set_is_contended(bool value)        {
 572     if (value) {
 573       _misc_flags |= _misc_is_contended;
 574     } else {
 575       _misc_flags &= ~_misc_is_contended;
 576     }
 577   }
 578 
 579   // source file name
 580   Symbol* source_file_name() const               {
 581     return (_source_file_name_index == 0) ?
 582       (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
 583   }
 584   u2 source_file_name_index() const              {
 585     return _source_file_name_index;
 586   }
 587   void set_source_file_name_index(u2 sourcefile_index) {
 588     _source_file_name_index = sourcefile_index;
 589   }
 590 
 591   // minor and major version numbers of class file
 592   u2 minor_version() const                 { return _minor_version; }
 593   void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
 594   u2 major_version() const                 { return _major_version; }
 595   void set_major_version(u2 major_version) { _major_version = major_version; }
 596 
 597   // source debug extension
 598   char* source_debug_extension() const     { return _source_debug_extension; }
 599   void set_source_debug_extension(char* array, int length);
 600 
 601   // symbol unloading support (refcount already added)
 602   Symbol* array_name()                     { return _array_name; }
 603   void set_array_name(Symbol* name)        { assert(_array_name == NULL  || name == NULL, "name already created"); _array_name = name; }
 604 
 605   // nonstatic oop-map blocks
 606   static int nonstatic_oop_map_size(unsigned int oop_map_count) {
 607     return oop_map_count * OopMapBlock::size_in_words();
 608   }
 609   unsigned int nonstatic_oop_map_count() const {
 610     return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
 611   }
 612   int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
 613   void set_nonstatic_oop_map_size(int words) {
 614     _nonstatic_oop_map_size = words;
 615   }
 616 
 617   // RedefineClasses() support for previous versions:
 618   void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
 619 
 620   InstanceKlass* previous_versions() const { return _previous_versions; }
 621 
 622   bool has_been_redefined() const {
 623     return (_misc_flags & _misc_has_been_redefined) != 0;
 624   }
 625   void set_has_been_redefined() {
 626     _misc_flags |= _misc_has_been_redefined;
 627   }
 628 
 629   void init_previous_versions() {
 630     _previous_versions = NULL;
 631   }
 632 
 633   static void purge_previous_versions(InstanceKlass* ik);
 634 
 635   // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
 636   void set_cached_class_file(JvmtiCachedClassFileData *data) {
 637     _cached_class_file = data;
 638   }
 639   JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
 640   jint get_cached_class_file_len();
 641   unsigned char * get_cached_class_file_bytes();
 642 
 643   // JVMTI: Support for caching of field indices, types, and offsets
 644   void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
 645     _jvmti_cached_class_field_map = descriptor;
 646   }
 647   JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
 648     return _jvmti_cached_class_field_map;
 649   }
 650 
 651   bool has_default_methods() const {
 652     return (_misc_flags & _misc_has_default_methods) != 0;
 653   }
 654   void set_has_default_methods(bool b) {
 655     if (b) {
 656       _misc_flags |= _misc_has_default_methods;
 657     } else {
 658       _misc_flags &= ~_misc_has_default_methods;
 659     }
 660   }
 661 
 662   bool declares_default_methods() const {
 663     return (_misc_flags & _misc_declares_default_methods) != 0;
 664   }
 665   void set_declares_default_methods(bool b) {
 666     if (b) {
 667       _misc_flags |= _misc_declares_default_methods;
 668     } else {
 669       _misc_flags &= ~_misc_declares_default_methods;
 670     }
 671   }
 672 
 673   // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
 674   inline u2 next_method_idnum();
 675   void set_initial_method_idnum(u2 value)             { _idnum_allocated_count = value; }
 676 
 677   // generics support
 678   Symbol* generic_signature() const                   {
 679     return (_generic_signature_index == 0) ?
 680       (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
 681   }
 682   u2 generic_signature_index() const                  {
 683     return _generic_signature_index;
 684   }
 685   void set_generic_signature_index(u2 sig_index)      {
 686     _generic_signature_index = sig_index;
 687   }
 688 
 689   u2 enclosing_method_data(int offset);
 690   u2 enclosing_method_class_index() {
 691     return enclosing_method_data(enclosing_method_class_index_offset);
 692   }
 693   u2 enclosing_method_method_index() {
 694     return enclosing_method_data(enclosing_method_method_index_offset);
 695   }
 696   void set_enclosing_method_indices(u2 class_index,
 697                                     u2 method_index);
 698 
 699   // jmethodID support
 700   static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
 701                      methodHandle method_h);
 702   static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
 703                      size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
 704                      jmethodID* to_dealloc_id_p,
 705                      jmethodID** to_dealloc_jmeths_p);
 706   static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
 707                 size_t *length_p, jmethodID* id_p);
 708   void ensure_space_for_methodids(int start_offset = 0);
 709   jmethodID jmethod_id_or_null(Method* method);
 710 
 711   // annotations support
 712   Annotations* annotations() const          { return _annotations; }
 713   void set_annotations(Annotations* anno)   { _annotations = anno; }
 714 
 715   AnnotationArray* class_annotations() const {
 716     return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
 717   }
 718   Array<AnnotationArray*>* fields_annotations() const {
 719     return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
 720   }
 721   AnnotationArray* class_type_annotations() const {
 722     return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
 723   }
 724   Array<AnnotationArray*>* fields_type_annotations() const {
 725     return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
 726   }
 727   // allocation
 728   instanceOop allocate_instance(TRAPS);
 729 
 730   // additional member function to return a handle
 731   instanceHandle allocate_instance_handle(TRAPS)      { return instanceHandle(THREAD, allocate_instance(THREAD)); }
 732 
 733   objArrayOop allocate_objArray(int n, int length, TRAPS);
 734   // Helper function
 735   static instanceOop register_finalizer(instanceOop i, TRAPS);
 736 
 737   // Check whether reflection/jni/jvm code is allowed to instantiate this class;
 738   // if not, throw either an Error or an Exception.
 739   virtual void check_valid_for_instantiation(bool throwError, TRAPS);
 740 
 741   // initialization
 742   void call_class_initializer(TRAPS);
 743   void set_initialization_state_and_notify(ClassState state, TRAPS);
 744 
 745   // OopMapCache support
 746   OopMapCache* oop_map_cache()               { return _oop_map_cache; }
 747   void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
 748   void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
 749 
 750   // JNI identifier support (for static fields - for jni performance)
 751   JNIid* jni_ids()                               { return _jni_ids; }
 752   void set_jni_ids(JNIid* ids)                   { _jni_ids = ids; }
 753   JNIid* jni_id_for(int offset);
 754 
 755   // maintenance of deoptimization dependencies
 756   int mark_dependent_nmethods(DepChange& changes);
 757   void add_dependent_nmethod(nmethod* nm);
 758   void remove_dependent_nmethod(nmethod* nm);
 759 
 760   // On-stack replacement support
 761   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
 762   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
 763   void add_osr_nmethod(nmethod* n);
 764   void remove_osr_nmethod(nmethod* n);
 765   int mark_osr_nmethods(const Method* m);
 766   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
 767 
 768   // Breakpoint support (see methods on Method* for details)
 769   BreakpointInfo* breakpoints() const       { return _breakpoints; };
 770   void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
 771 
 772   // support for stub routines
 773   static ByteSize init_state_offset()  { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
 774   TRACE_DEFINE_OFFSET;
 775   static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
 776 
 777   // subclass/subinterface checks
 778   bool implements_interface(Klass* k) const;
 779   bool is_same_or_direct_interface(Klass* k) const;
 780 
 781 #ifdef ASSERT
 782   // check whether this class or one of its superclasses was redefined
 783   bool has_redefined_this_or_super() const;
 784 #endif
 785 
 786   // Access to the implementor of an interface.
 787   Klass* implementor() const
 788   {
 789     Klass** k = adr_implementor();
 790     if (k == NULL) {
 791       return NULL;
 792     } else {
 793       return *k;
 794     }
 795   }
 796 
 797   void set_implementor(Klass* k) {
 798     assert(is_interface(), "not interface");
 799     Klass** addr = adr_implementor();
 800     assert(addr != NULL, "null addr");
 801     if (addr != NULL) {
 802       *addr = k;
 803     }
 804   }
 805 
 806   int  nof_implementors() const       {
 807     Klass* k = implementor();
 808     if (k == NULL) {
 809       return 0;
 810     } else if (k != this) {
 811       return 1;
 812     } else {
 813       return 2;
 814     }
 815   }
 816 
 817   void add_implementor(Klass* k);  // k is a new class that implements this interface
 818   void init_implementor();           // initialize
 819 
 820   // link this class into the implementors list of every interface it implements
 821   void process_interfaces(Thread *thread);
 822 
 823   // virtual operations from Klass
 824   bool is_leaf_class() const               { return _subklass == NULL; }
 825   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
 826   bool compute_is_subtype_of(Klass* k);
 827   bool can_be_primary_super_slow() const;
 828   int oop_size(oop obj)  const             { return size_helper(); }
 829   bool oop_is_instance_slow() const        { return true; }
 830 
 831   // Iterators
 832   void do_local_static_fields(FieldClosure* cl);
 833   void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
 834   void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
 835 
 836   void methods_do(void f(Method* method));
 837   void array_klasses_do(void f(Klass* k));
 838   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
 839   bool super_types_do(SuperTypeClosure* blk);
 840 
 841   // Casting from Klass*
 842   static InstanceKlass* cast(Klass* k) {
 843     assert(k == NULL || k->is_klass(), "must be");
 844     assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
 845     return (InstanceKlass*) k;
 846   }
 847 
 848   InstanceKlass* java_super() const {
 849     return (super() == NULL) ? NULL : cast(super());
 850   }
 851 
 852   // Sizing (in words)
 853   static int header_size()            { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
 854 
 855   static int size(int vtable_length, int itable_length,
 856                   int nonstatic_oop_map_size,
 857                   bool is_interface, bool is_anonymous) {
 858     return align_object_size(header_size() +
 859            align_object_offset(vtable_length) +
 860            align_object_offset(itable_length) +
 861            ((is_interface || is_anonymous) ?
 862              align_object_offset(nonstatic_oop_map_size) :
 863              nonstatic_oop_map_size) +
 864            (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
 865            (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
 866   }
 867   int size() const                    { return size(vtable_length(),
 868                                                itable_length(),
 869                                                nonstatic_oop_map_size(),
 870                                                is_interface(),
 871                                                is_anonymous());
 872   }
 873 #if INCLUDE_SERVICES
 874   virtual void collect_statistics(KlassSizeStats *sz) const;
 875 #endif
 876 
 877   static int vtable_start_offset()    { return header_size(); }
 878   static int vtable_length_offset()   { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
 879 
 880   intptr_t* start_of_vtable() const        { return ((intptr_t*)this) + vtable_start_offset(); }
 881   intptr_t* start_of_itable() const        { return start_of_vtable() + align_object_offset(vtable_length()); }
 882   int  itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
 883 
 884   intptr_t* end_of_itable() const          { return start_of_itable() + itable_length(); }
 885 
 886   address static_field_addr(int offset);
 887 
 888   OopMapBlock* start_of_nonstatic_oop_maps() const {
 889     return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
 890   }
 891 
 892   Klass** end_of_nonstatic_oop_maps() const {
 893     return (Klass**)(start_of_nonstatic_oop_maps() +
 894                      nonstatic_oop_map_count());
 895   }
 896 
 897   Klass** adr_implementor() const {
 898     if (is_interface()) {
 899       return (Klass**)end_of_nonstatic_oop_maps();
 900     } else {
 901       return NULL;
 902     }
 903   };
 904 
 905   Klass** adr_host_klass() const {
 906     if (is_anonymous()) {
 907       Klass** adr_impl = adr_implementor();
 908       if (adr_impl != NULL) {
 909         return adr_impl + 1;
 910       } else {
 911         return end_of_nonstatic_oop_maps();
 912       }
 913     } else {
 914       return NULL;
 915     }
 916   }
 917 
 918   // Use this to return the size of an instance in heap words:
 919   int size_helper() const {
 920     return layout_helper_to_size_helper(layout_helper());
 921   }
 922 
 923   // This bit is initialized in classFileParser.cpp.
 924   // It is false under any of the following conditions:
 925   //  - the class is abstract (including any interface)
 926   //  - the class has a finalizer (if !RegisterFinalizersAtInit)
 927   //  - the class size is larger than FastAllocateSizeLimit
 928   //  - the class is java/lang/Class, which cannot be allocated directly
 929   bool can_be_fastpath_allocated() const {
 930     return !layout_helper_needs_slow_path(layout_helper());
 931   }
 932 
 933   // Java vtable/itable
 934   klassVtable* vtable() const;        // return new klassVtable wrapper
 935   inline Method* method_at_vtable(int index);
 936   klassItable* itable() const;        // return new klassItable wrapper
 937   Method* method_at_itable(Klass* holder, int index, TRAPS);
 938 
 939 #if INCLUDE_JVMTI
 940   void adjust_default_methods(Method** old_methods, Method** new_methods,
 941                               int methods_length, bool* trace_name_printed);
 942 #endif // INCLUDE_JVMTI
 943 
 944   // Garbage collection
 945   void oop_follow_contents(oop obj);
 946   int  oop_adjust_pointers(oop obj);
 947 
 948   void clean_implementors_list(BoolObjectClosure* is_alive);
 949   void clean_method_data(BoolObjectClosure* is_alive);
 950   void clean_dependent_nmethods();
 951 
 952   // Explicit metaspace deallocation of fields
 953   // For RedefineClasses and class file parsing errors, we need to deallocate
 954   // instanceKlasses and the metadata they point to.
 955   void deallocate_contents(ClassLoaderData* loader_data);
 956   static void deallocate_methods(ClassLoaderData* loader_data,
 957                                  Array<Method*>* methods);
 958   void static deallocate_interfaces(ClassLoaderData* loader_data,
 959                                     Klass* super_klass,
 960                                     Array<Klass*>* local_interfaces,
 961                                     Array<Klass*>* transitive_interfaces);
 962 
 963   // The constant pool is on stack if any of the methods are executing or
 964   // referenced by handles.
 965   bool on_stack() const { return _constants->on_stack(); }
 966 
 967   // callbacks for actions during class unloading
 968   static void notify_unload_class(InstanceKlass* ik);
 969   static void release_C_heap_structures(InstanceKlass* ik);
 970 
 971   // Parallel Scavenge and Parallel Old
 972   PARALLEL_GC_DECLS
 973 
 974   // Naming
 975   const char* signature_name() const;
 976 
 977   // Iterators
 978   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
 979     return oop_oop_iterate_v(obj, blk);
 980   }
 981 
 982   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
 983     return oop_oop_iterate_v_m(obj, blk, mr);
 984   }
 985 
 986 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)      \
 987   int  oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);           \
 988   int  oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk,        \
 989                                       MemRegion mr);
 990 
 991   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
 992   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
 993 
 994 #if INCLUDE_ALL_GCS
 995 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
 996   int  oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
 997 
 998   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
 999   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1000 #endif // INCLUDE_ALL_GCS
1001 
1002   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
1003 
1004 public:
1005   void set_in_error_state() {
1006     assert(DumpSharedSpaces, "only call this when dumping archive");
1007     _init_state = initialization_error;
1008   }
1009   bool check_sharing_error_state();
1010 
1011 private:
1012   // initialization state
1013 #ifdef ASSERT
1014   void set_init_state(ClassState state);
1015 #else
1016   void set_init_state(ClassState state) { _init_state = (u1)state; }
1017 #endif
1018   void set_rewritten()                  { _misc_flags |= _misc_rewritten; }
1019   void set_init_thread(Thread *thread)  { _init_thread = thread; }
1020 
1021   // The RedefineClasses() API can cause new method idnums to be needed
1022   // which will cause the caches to grow. Safety requires different
1023   // cache management logic if the caches can grow instead of just
1024   // going from NULL to non-NULL.
1025   bool idnum_can_increment() const      { return has_been_redefined(); }
1026   jmethodID* methods_jmethod_ids_acquire() const
1027          { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1028   void release_set_methods_jmethod_ids(jmethodID* jmeths)
1029          { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1030 
1031   // Lock during initialization
1032 public:
1033   // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1034   // Must be one per class and it has to be a VM internal object so java code
1035   // cannot lock it (like the mirror).
1036   // It has to be an object not a Mutex because it's held through java calls.
1037   oop init_lock() const;
1038 private:
1039   void fence_and_clear_init_lock();
1040 
1041   // Static methods that are used to implement member methods where an exposed this pointer
1042   // is needed due to possible GCs
1043   static bool link_class_impl                           (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1044   static bool verify_code                               (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1045   static void initialize_impl                           (instanceKlassHandle this_k, TRAPS);
1046   static void initialize_super_interfaces               (instanceKlassHandle this_k, TRAPS);
1047   static void eager_initialize_impl                     (instanceKlassHandle this_k);
1048   static void set_initialization_state_and_notify_impl  (instanceKlassHandle this_k, ClassState state, TRAPS);
1049   static void call_class_initializer_impl               (instanceKlassHandle this_k, TRAPS);
1050   static Klass* array_klass_impl                        (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1051   static void do_local_static_fields_impl               (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1052   /* jni_id_for_impl for jfieldID only */
1053   static JNIid* jni_id_for_impl                         (instanceKlassHandle this_k, int offset);
1054 
1055   // Returns the array class for the n'th dimension
1056   Klass* array_klass_impl(bool or_null, int n, TRAPS);
1057 
1058   // Returns the array class with this class as element type
1059   Klass* array_klass_impl(bool or_null, TRAPS);
1060 
1061   // find a local method (returns NULL if not found)
1062   Method* find_method_impl(Symbol* name, Symbol* signature,
1063                            OverpassLookupMode overpass_mode, StaticLookupMode static_mode) const;
1064   static Method* find_method_impl(Array<Method*>* methods, Symbol* name, Symbol* signature,
1065                                   OverpassLookupMode overpass_mode, StaticLookupMode static_mode);
1066 
1067   // Free CHeap allocated fields.
1068   void release_C_heap_structures();
1069 
1070   // RedefineClasses support
1071   void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1072   void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1073 public:
1074   // CDS support - remove and restore oops from metadata. Oops are not shared.
1075   virtual void remove_unshareable_info();
1076   virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1077 
1078   // jvm support
1079   jint compute_modifier_flags(TRAPS) const;
1080 
1081   // JSR-292 support
1082   MemberNameTable* member_names() { return _member_names; }
1083   void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1084   bool add_member_name(Handle member_name);
1085 
1086 public:
1087   // JVMTI support
1088   jint jvmti_class_status() const;
1089 
1090  public:
1091   // Printing
1092 #ifndef PRODUCT
1093   void print_on(outputStream* st) const;
1094 #endif
1095   void print_value_on(outputStream* st) const;
1096 
1097   void oop_print_value_on(oop obj, outputStream* st);
1098 
1099 #ifndef PRODUCT
1100   void oop_print_on      (oop obj, outputStream* st);
1101 
1102   void print_dependent_nmethods(bool verbose = false);
1103   bool is_dependent_nmethod(nmethod* nm);
1104 #endif
1105 
1106   const char* internal_name() const;
1107 
1108   // Verification
1109   void verify_on(outputStream* st);
1110 
1111   void oop_verify_on(oop obj, outputStream* st);
1112 };
1113 
1114 inline Method* InstanceKlass::method_at_vtable(int index)  {
1115 #ifndef PRODUCT
1116   assert(index >= 0, "valid vtable index");
1117   if (DebugVtables) {
1118     verify_vtable_index(index);
1119   }
1120 #endif
1121   vtableEntry* ve = (vtableEntry*)start_of_vtable();
1122   return ve[index].method();
1123 }
1124 
1125 // for adding methods
1126 // UNSET_IDNUM return means no more ids available
1127 inline u2 InstanceKlass::next_method_idnum() {
1128   if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1129     return ConstMethod::UNSET_IDNUM; // no more ids available
1130   } else {
1131     return _idnum_allocated_count++;
1132   }
1133 }
1134 
1135 
1136 /* JNIid class for jfieldIDs only */
1137 class JNIid: public CHeapObj<mtClass> {
1138   friend class VMStructs;
1139  private:
1140   Klass*             _holder;
1141   JNIid*             _next;
1142   int                _offset;
1143 #ifdef ASSERT
1144   bool               _is_static_field_id;
1145 #endif
1146 
1147  public:
1148   // Accessors
1149   Klass* holder() const           { return _holder; }
1150   int offset() const              { return _offset; }
1151   JNIid* next()                   { return _next; }
1152   // Constructor
1153   JNIid(Klass* holder, int offset, JNIid* next);
1154   // Identifier lookup
1155   JNIid* find(int offset);
1156 
1157   bool find_local_field(fieldDescriptor* fd) {
1158     return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1159   }
1160 
1161   static void deallocate(JNIid* id);
1162   // Debugging
1163 #ifdef ASSERT
1164   bool is_static_field_id() const { return _is_static_field_id; }
1165   void set_is_static_field_id()   { _is_static_field_id = true; }
1166 #endif
1167   void verify(Klass* holder);
1168 };
1169 
1170 
1171 //
1172 // nmethodBucket is used to record dependent nmethods for
1173 // deoptimization.  nmethod dependencies are actually <klass, method>
1174 // pairs but we really only care about the klass part for purposes of
1175 // finding nmethods which might need to be deoptimized.  Instead of
1176 // recording the method, a count of how many times a particular nmethod
1177 // was recorded is kept.  This ensures that any recording errors are
1178 // noticed since an nmethod should be removed as many times are it's
1179 // added.
1180 //
1181 class nmethodBucket: public CHeapObj<mtClass> {
1182   friend class VMStructs;
1183  private:
1184   nmethod*       _nmethod;
1185   int            _count;
1186   nmethodBucket* _next;
1187 
1188  public:
1189   nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1190     _nmethod = nmethod;
1191     _next = next;
1192     _count = 1;
1193   }
1194   int count()                             { return _count; }
1195   int increment()                         { _count += 1; return _count; }
1196   int decrement();
1197   nmethodBucket* next()                   { return _next; }
1198   void set_next(nmethodBucket* b)         { _next = b; }
1199   nmethod* get_nmethod()                  { return _nmethod; }
1200 };
1201 
1202 // An iterator that's used to access the inner classes indices in the
1203 // InstanceKlass::_inner_classes array.
1204 class InnerClassesIterator : public StackObj {
1205  private:
1206   Array<jushort>* _inner_classes;
1207   int _length;
1208   int _idx;
1209  public:
1210 
1211   InnerClassesIterator(instanceKlassHandle k) {
1212     _inner_classes = k->inner_classes();
1213     if (k->inner_classes() != NULL) {
1214       _length = _inner_classes->length();
1215       // The inner class array's length should be the multiple of
1216       // inner_class_next_offset if it only contains the InnerClasses
1217       // attribute data, or it should be
1218       // n*inner_class_next_offset+enclosing_method_attribute_size
1219       // if it also contains the EnclosingMethod data.
1220       assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1221               _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1222              "just checking");
1223       // Remove the enclosing_method portion if exists.
1224       if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1225         _length -= InstanceKlass::enclosing_method_attribute_size;
1226       }
1227     } else {
1228       _length = 0;
1229     }
1230     _idx = 0;
1231   }
1232 
1233   int length() const {
1234     return _length;
1235   }
1236 
1237   void next() {
1238     _idx += InstanceKlass::inner_class_next_offset;
1239   }
1240 
1241   bool done() const {
1242     return (_idx >= _length);
1243   }
1244 
1245   u2 inner_class_info_index() const {
1246     return _inner_classes->at(
1247                _idx + InstanceKlass::inner_class_inner_class_info_offset);
1248   }
1249 
1250   void set_inner_class_info_index(u2 index) {
1251     _inner_classes->at_put(
1252                _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1253   }
1254 
1255   u2 outer_class_info_index() const {
1256     return _inner_classes->at(
1257                _idx + InstanceKlass::inner_class_outer_class_info_offset);
1258   }
1259 
1260   void set_outer_class_info_index(u2 index) {
1261     _inner_classes->at_put(
1262                _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1263   }
1264 
1265   u2 inner_name_index() const {
1266     return _inner_classes->at(
1267                _idx + InstanceKlass::inner_class_inner_name_offset);
1268   }
1269 
1270   void set_inner_name_index(u2 index) {
1271     _inner_classes->at_put(
1272                _idx + InstanceKlass::inner_class_inner_name_offset, index);
1273   }
1274 
1275   u2 inner_access_flags() const {
1276     return _inner_classes->at(
1277                _idx + InstanceKlass::inner_class_access_flags_offset);
1278   }
1279 };
1280 
1281 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP