1 /*
   2  * Copyright (c) 1997, 2017, 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/atomic.hpp"
  36 #include "runtime/handles.hpp"
  37 #include "runtime/os.hpp"
  38 #include "utilities/accessFlags.hpp"
  39 #include "utilities/bitMap.inline.hpp"
  40 #include "utilities/macros.hpp"
  41 #include "trace/traceMacros.hpp"
  42 
  43 // An InstanceKlass is the VM level representation of a Java class.
  44 // It contains all information needed for at class at execution runtime.
  45 
  46 //  InstanceKlass layout:
  47 //    [C++ vtbl pointer           ] Klass
  48 //    [subtype cache              ] Klass
  49 //    [instance size              ] Klass
  50 //    [java mirror                ] Klass
  51 //    [super                      ] Klass
  52 //    [access_flags               ] Klass
  53 //    [name                       ] Klass
  54 //    [first subklass             ] Klass
  55 //    [next sibling               ] Klass
  56 //    [array klasses              ]
  57 //    [methods                    ]
  58 //    [local interfaces           ]
  59 //    [transitive interfaces      ]
  60 //    [fields                     ]
  61 //    [constants                  ]
  62 //    [class loader               ]
  63 //    [source file name           ]
  64 //    [inner classes              ]
  65 //    [static field size          ]
  66 //    [nonstatic field size       ]
  67 //    [static oop fields size     ]
  68 //    [nonstatic oop maps size    ]
  69 //    [has finalize method        ]
  70 //    [deoptimization mark bit    ]
  71 //    [initialization state       ]
  72 //    [initializing thread        ]
  73 //    [Java vtable length         ]
  74 //    [oop map cache (stack maps) ]
  75 //    [EMBEDDED Java vtable             ] size in words = vtable_len
  76 //    [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
  77 //      The embedded nonstatic oop-map blocks are short pairs (offset, length)
  78 //      indicating where oops are located in instances of this klass.
  79 //    [EMBEDDED implementor of the interface] only exist for interface
  80 //    [EMBEDDED host klass        ] only exist for an anonymous class (JSR 292 enabled)
  81 
  82 
  83 // forward declaration for class -- see below for definition
  84 class SuperTypeClosure;
  85 class JNIid;
  86 class jniIdMapBase;
  87 class BreakpointInfo;
  88 class fieldDescriptor;
  89 class DepChange;
  90 class nmethodBucket;
  91 class JvmtiCachedClassFieldMap;
  92 class MemberNameTable;
  93 
  94 // This is used in iterators below.
  95 class FieldClosure: public StackObj {
  96 public:
  97   virtual void do_field(fieldDescriptor* fd) = 0;
  98 };
  99 
 100 #ifndef PRODUCT
 101 // Print fields.
 102 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
 103 class FieldPrinter: public FieldClosure {
 104    oop _obj;
 105    outputStream* _st;
 106  public:
 107    FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
 108    void do_field(fieldDescriptor* fd);
 109 };
 110 #endif  // !PRODUCT
 111 
 112 // ValueObjs embedded in klass. Describes where oops are located in instances of
 113 // this klass.
 114 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
 115  public:
 116   // Byte offset of the first oop mapped by this block.
 117   int offset() const          { return _offset; }
 118   void set_offset(int offset) { _offset = offset; }
 119 
 120   // Number of oops in this block.
 121   uint count() const         { return _count; }
 122   void set_count(uint count) { _count = count; }
 123 
 124   // sizeof(OopMapBlock) in HeapWords.
 125   static const int size_in_words() {
 126     return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
 127       LogHeapWordSize;
 128   }
 129 
 130  private:
 131   int  _offset;
 132   uint _count;
 133 };
 134 
 135 struct JvmtiCachedClassFileData;
 136 
 137 class InstanceKlass: public Klass {
 138   friend class VMStructs;
 139   friend class ClassFileParser;
 140   friend class CompileReplay;
 141 
 142  protected:
 143   // Constructor
 144   InstanceKlass(int vtable_len,
 145                 int itable_len,
 146                 int static_field_size,
 147                 int nonstatic_oop_map_size,
 148                 ReferenceType rt,
 149                 AccessFlags access_flags,
 150                 bool is_anonymous);
 151  public:
 152   static InstanceKlass* allocate_instance_klass(
 153                                           ClassLoaderData* loader_data,
 154                                           int vtable_len,
 155                                           int itable_len,
 156                                           int static_field_size,
 157                                           int nonstatic_oop_map_size,
 158                                           ReferenceType rt,
 159                                           AccessFlags access_flags,
 160                                           Symbol* name,
 161                                           Klass* super_klass,
 162                                           bool is_anonymous,
 163                                           TRAPS);
 164 
 165   InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
 166 
 167   // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
 168   // of the class loading & initialization procedure, and the use of the states.
 169   enum ClassState {
 170     allocated,                          // allocated (but not yet linked)
 171     loaded,                             // loaded and inserted in class hierarchy (but not linked yet)
 172     linked,                             // successfully linked/verified (but not initialized yet)
 173     being_initialized,                  // currently running class initializer
 174     fully_initialized,                  // initialized (successfull final state)
 175     initialization_error                // error happened during initialization
 176   };
 177 
 178   static int number_of_instance_classes() { return _total_instanceKlass_count; }
 179 
 180  private:
 181   static volatile int _total_instanceKlass_count;
 182 
 183  protected:
 184   // Annotations for this class
 185   Annotations*    _annotations;
 186   // Array classes holding elements of this class.
 187   Klass*          _array_klasses;
 188   // Constant pool for this class.
 189   ConstantPool* _constants;
 190   // The InnerClasses attribute and EnclosingMethod attribute. The
 191   // _inner_classes is an array of shorts. If the class has InnerClasses
 192   // attribute, then the _inner_classes array begins with 4-tuples of shorts
 193   // [inner_class_info_index, outer_class_info_index,
 194   // inner_name_index, inner_class_access_flags] for the InnerClasses
 195   // attribute. If the EnclosingMethod attribute exists, it occupies the
 196   // last two shorts [class_index, method_index] of the array. If only
 197   // the InnerClasses attribute exists, the _inner_classes array length is
 198   // number_of_inner_classes * 4. If the class has both InnerClasses
 199   // and EnclosingMethod attributes the _inner_classes array length is
 200   // number_of_inner_classes * 4 + enclosing_method_attribute_size.
 201   Array<jushort>* _inner_classes;
 202 
 203   // the source debug extension for this klass, NULL if not specified.
 204   // Specified as UTF-8 string without terminating zero byte in the classfile,
 205   // it is stored in the instanceklass as a NULL-terminated UTF-8 string
 206   char*           _source_debug_extension;
 207   // Array name derived from this class which needs unreferencing
 208   // if this class is unloaded.
 209   Symbol*         _array_name;
 210 
 211   // Number of heapOopSize words used by non-static fields in this klass
 212   // (including inherited fields but after header_size()).
 213   int             _nonstatic_field_size;
 214   int             _static_field_size;    // number words used by static fields (oop and non-oop) in this klass
 215   // Constant pool index to the utf8 entry of the Generic signature,
 216   // or 0 if none.
 217   u2              _generic_signature_index;
 218   // Constant pool index to the utf8 entry for the name of source file
 219   // containing this klass, 0 if not specified.
 220   u2              _source_file_name_index;
 221   u2              _static_oop_field_count;// number of static oop fields in this klass
 222   u2              _java_fields_count;    // The number of declared Java fields
 223   int             _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
 224 
 225   // _is_marked_dependent can be set concurrently, thus cannot be part of the
 226   // _misc_flags.
 227   bool            _is_marked_dependent;  // used for marking during flushing and deoptimization
 228   bool            _has_unloaded_dependent;
 229 
 230   enum {
 231     _misc_rewritten                = 1 << 0, // methods rewritten.
 232     _misc_has_nonstatic_fields     = 1 << 1, // for sizing with UseCompressedOops
 233     _misc_should_verify_class      = 1 << 2, // allow caching of preverification
 234     _misc_is_anonymous             = 1 << 3, // has embedded _host_klass field
 235     _misc_is_contended             = 1 << 4, // marked with contended annotation
 236     _misc_has_default_methods      = 1 << 5, // class/superclass/implemented interfaces has default methods
 237     _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
 238     _misc_has_been_redefined       = 1 << 7  // class has been redefined
 239   };
 240   u2              _misc_flags;
 241   u2              _minor_version;        // minor version number of class file
 242   u2              _major_version;        // major version number of class file
 243   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
 244   int             _vtable_len;           // length of Java vtable (in words)
 245   int             _itable_len;           // length of Java itable (in words)
 246   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
 247   MemberNameTable* _member_names;        // Member names
 248   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
 249   jmethodID*      _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
 250   nmethodBucket*  _dependencies;         // list of dependent nmethods
 251   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
 252   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
 253   // Linked instanceKlasses of previous versions
 254   InstanceKlass* _previous_versions;
 255   // JVMTI fields can be moved to their own structure - see 6315920
 256   // JVMTI: cached class file, before retransformable agent modified it in CFLH
 257   JvmtiCachedClassFileData* _cached_class_file;
 258 
 259   volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
 260 
 261   // Class states are defined as ClassState (see above).
 262   // Place the _init_state here to utilize the unused 2-byte after
 263   // _idnum_allocated_count.
 264   u1              _init_state;                    // state of class
 265   u1              _reference_type;                // reference type
 266 
 267   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
 268 
 269   NOT_PRODUCT(int _verify_count;)  // to avoid redundant verifies
 270 
 271   // Method array.
 272   Array<Method*>* _methods;
 273   // Default Method Array, concrete methods inherited from interfaces
 274   Array<Method*>* _default_methods;
 275   // Interface (Klass*s) this class declares locally to implement.
 276   Array<Klass*>* _local_interfaces;
 277   // Interface (Klass*s) this class implements transitively.
 278   Array<Klass*>* _transitive_interfaces;
 279   // Int array containing the original order of method in the class file (for JVMTI).
 280   Array<int>*     _method_ordering;
 281   // Int array containing the vtable_indices for default_methods
 282   // offset matches _default_methods offset
 283   Array<int>*     _default_vtable_indices;
 284 
 285   // Instance and static variable information, starts with 6-tuples of shorts
 286   // [access, name index, sig index, initval index, low_offset, high_offset]
 287   // for all fields, followed by the generic signature data at the end of
 288   // the array. Only fields with generic signature attributes have the generic
 289   // signature data set in the array. The fields array looks like following:
 290   //
 291   // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
 292   // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
 293   //      ...
 294   // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
 295   //     [generic signature index]
 296   //     [generic signature index]
 297   //     ...
 298   Array<u2>*      _fields;
 299 
 300   // embedded Java vtable follows here
 301   // embedded Java itables follows here
 302   // embedded static fields follows here
 303   // embedded nonstatic oop-map blocks follows here
 304   // embedded implementor of this interface follows here
 305   //   The embedded implementor only exists if the current klass is an
 306   //   iterface. The possible values of the implementor fall into following
 307   //   three cases:
 308   //     NULL: no implementor.
 309   //     A Klass* that's not itself: one implementor.
 310   //     Itself: more than one implementors.
 311   // embedded host klass follows here
 312   //   The embedded host klass only exists in an anonymous class for
 313   //   dynamic language support (JSR 292 enabled). The host class grants
 314   //   its access privileges to this class also. The host class is either
 315   //   named, or a previously loaded anonymous class. A non-anonymous class
 316   //   or an anonymous class loaded through normal classloading does not
 317   //   have this embedded field.
 318   //
 319 
 320   friend class SystemDictionary;
 321 
 322  public:
 323   bool has_nonstatic_fields() const        {
 324     return (_misc_flags & _misc_has_nonstatic_fields) != 0;
 325   }
 326   void set_has_nonstatic_fields(bool b)    {
 327     if (b) {
 328       _misc_flags |= _misc_has_nonstatic_fields;
 329     } else {
 330       _misc_flags &= ~_misc_has_nonstatic_fields;
 331     }
 332   }
 333 
 334   // field sizes
 335   int nonstatic_field_size() const         { return _nonstatic_field_size; }
 336   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
 337 
 338   int static_field_size() const            { return _static_field_size; }
 339   void set_static_field_size(int size)     { _static_field_size = size; }
 340 
 341   int static_oop_field_count() const       { return (int)_static_oop_field_count; }
 342   void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
 343 
 344   // Java vtable
 345   int  vtable_length() const               { return _vtable_len; }
 346   void set_vtable_length(int len)          { _vtable_len = len; }
 347 
 348   // Java itable
 349   int  itable_length() const               { return _itable_len; }
 350   void set_itable_length(int len)          { _itable_len = len; }
 351 
 352   // array klasses
 353   Klass* array_klasses() const             { return _array_klasses; }
 354   void set_array_klasses(Klass* k)         { _array_klasses = k; }
 355 
 356   // methods
 357   Array<Method*>* methods() const          { return _methods; }
 358   void set_methods(Array<Method*>* a)      { _methods = a; }
 359   Method* method_with_idnum(int idnum);
 360   Method* method_with_orig_idnum(int idnum);
 361   Method* method_with_orig_idnum(int idnum, int version);
 362 
 363   // method ordering
 364   Array<int>* method_ordering() const     { return _method_ordering; }
 365   void set_method_ordering(Array<int>* m) { _method_ordering = m; }
 366   void copy_method_ordering(intArray* m, TRAPS);
 367 
 368   // default_methods
 369   Array<Method*>* default_methods() const  { return _default_methods; }
 370   void set_default_methods(Array<Method*>* a) { _default_methods = a; }
 371 
 372   // default method vtable_indices
 373   Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
 374   void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
 375   Array<int>* create_new_default_vtable_indices(int len, TRAPS);
 376 
 377   // interfaces
 378   Array<Klass*>* local_interfaces() const          { return _local_interfaces; }
 379   void set_local_interfaces(Array<Klass*>* a)      {
 380     guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
 381     _local_interfaces = a; }
 382 
 383   Array<Klass*>* transitive_interfaces() const     { return _transitive_interfaces; }
 384   void set_transitive_interfaces(Array<Klass*>* a) {
 385     guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
 386     _transitive_interfaces = a;
 387   }
 388 
 389  private:
 390   friend class fieldDescriptor;
 391   FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
 392 
 393  public:
 394   int     field_offset      (int index) const { return field(index)->offset(); }
 395   int     field_access_flags(int index) const { return field(index)->access_flags(); }
 396   Symbol* field_name        (int index) const { return field(index)->name(constants()); }
 397   Symbol* field_signature   (int index) const { return field(index)->signature(constants()); }
 398 
 399   // Number of Java declared fields
 400   int java_fields_count() const           { return (int)_java_fields_count; }
 401 
 402   Array<u2>* fields() const            { return _fields; }
 403   void set_fields(Array<u2>* f, u2 java_fields_count) {
 404     guarantee(_fields == NULL || f == NULL, "Just checking");
 405     _fields = f;
 406     _java_fields_count = java_fields_count;
 407   }
 408 
 409   // inner classes
 410   Array<u2>* inner_classes() const       { return _inner_classes; }
 411   void set_inner_classes(Array<u2>* f)   { _inner_classes = f; }
 412 
 413   enum InnerClassAttributeOffset {
 414     // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
 415     inner_class_inner_class_info_offset = 0,
 416     inner_class_outer_class_info_offset = 1,
 417     inner_class_inner_name_offset = 2,
 418     inner_class_access_flags_offset = 3,
 419     inner_class_next_offset = 4
 420   };
 421 
 422   enum EnclosingMethodAttributeOffset {
 423     enclosing_method_class_index_offset = 0,
 424     enclosing_method_method_index_offset = 1,
 425     enclosing_method_attribute_size = 2
 426   };
 427 
 428   // method override check
 429   bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
 430 
 431   // package
 432   bool is_same_class_package(Klass* class2);
 433   bool is_same_class_package(oop classloader2, Symbol* classname2);
 434   static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
 435 
 436   // find an enclosing class (defined where original code was, in jvm.cpp!)
 437   Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
 438     instanceKlassHandle self(THREAD, this);
 439     return compute_enclosing_class_impl(self, inner_is_member, THREAD);
 440   }
 441   static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
 442                                                bool* inner_is_member, TRAPS);
 443 
 444   // tell if two classes have the same enclosing class (at package level)
 445   bool is_same_package_member(Klass* class2, TRAPS) {
 446     instanceKlassHandle self(THREAD, this);
 447     return is_same_package_member_impl(self, class2, THREAD);
 448   }
 449   static bool is_same_package_member_impl(instanceKlassHandle self,
 450                                           Klass* class2, TRAPS);
 451 
 452   // initialization state
 453   bool is_loaded() const                   { return _init_state >= loaded; }
 454   bool is_linked() const                   { return _init_state >= linked; }
 455   bool is_initialized() const              { return _init_state == fully_initialized; }
 456   bool is_not_initialized() const          { return _init_state <  being_initialized; }
 457   bool is_being_initialized() const        { return _init_state == being_initialized; }
 458   bool is_in_error_state() const           { return _init_state == initialization_error; }
 459   bool is_reentrant_initialization(Thread *thread)  { return thread == _init_thread; }
 460   ClassState  init_state()                 { return (ClassState)_init_state; }
 461   bool is_rewritten() const                { return (_misc_flags & _misc_rewritten) != 0; }
 462 
 463   // defineClass specified verification
 464   bool should_verify_class() const         {
 465     return (_misc_flags & _misc_should_verify_class) != 0;
 466   }
 467   void set_should_verify_class(bool value) {
 468     if (value) {
 469       _misc_flags |= _misc_should_verify_class;
 470     } else {
 471       _misc_flags &= ~_misc_should_verify_class;
 472     }
 473   }
 474 
 475   // marking
 476   bool is_marked_dependent() const         { return _is_marked_dependent; }
 477   void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
 478 
 479   bool has_unloaded_dependent() const         { return _has_unloaded_dependent; }
 480   void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
 481 
 482   // initialization (virtuals from Klass)
 483   bool should_be_initialized() const;  // means that initialize should be called
 484   void initialize(TRAPS);
 485   void link_class(TRAPS);
 486   bool link_class_or_fail(TRAPS); // returns false on failure
 487   void unlink_class();
 488   void rewrite_class(TRAPS);
 489   void link_methods(TRAPS);
 490   Method* class_initializer();
 491 
 492   // set the class to initialized if no static initializer is present
 493   void eager_initialize(Thread *thread);
 494 
 495   // reference type
 496   ReferenceType reference_type() const     { return (ReferenceType)_reference_type; }
 497   void set_reference_type(ReferenceType t) {
 498     assert(t == (u1)t, "overflow");
 499     _reference_type = (u1)t;
 500   }
 501 
 502   static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
 503 
 504   // find local field, returns true if found
 505   bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 506   // find field in direct superinterfaces, returns the interface in which the field is defined
 507   Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 508   // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 509   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 510   // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 511   Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
 512 
 513   // find a non-static or static field given its offset within the class.
 514   bool contains_field_offset(int offset) {
 515     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 516   }
 517 
 518   bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 519   bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 520 
 521   // find a local method (returns NULL if not found)
 522   Method* find_method(Symbol* name, Symbol* signature) const;
 523   static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
 524 
 525   // find a local method, but skip static methods
 526   Method* find_instance_method(Symbol* name, Symbol* signature);
 527   static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
 528 
 529   // find a local method (returns NULL if not found)
 530   Method* find_local_method(Symbol* name, Symbol* signature,
 531                            OverpassLookupMode overpass_mode,
 532                            StaticLookupMode static_mode,
 533                            PrivateLookupMode private_mode) const;
 534 
 535   // find a local method from given methods array (returns NULL if not found)
 536   static Method* find_local_method(Array<Method*>* methods,
 537                            Symbol* name, Symbol* signature,
 538                            OverpassLookupMode overpass_mode,
 539                            StaticLookupMode static_mode,
 540                            PrivateLookupMode private_mode);
 541 
 542   // true if method matches signature and conforms to skipping_X conditions.
 543   static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
 544 
 545   // find a local method index in methods or default_methods (returns -1 if not found)
 546   static int find_method_index(Array<Method*>* methods,
 547                                Symbol* name, Symbol* signature,
 548                                OverpassLookupMode overpass_mode,
 549                                StaticLookupMode static_mode,
 550                                PrivateLookupMode private_mode);
 551 
 552 
 553   // lookup operation (returns NULL if not found)
 554   Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
 555 
 556   // lookup a method in all the interfaces that this class implements
 557   // (returns NULL if not found)
 558   Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
 559 
 560   // lookup a method in local defaults then in all interfaces
 561   // (returns NULL if not found)
 562   Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
 563 
 564   // Find method indices by name.  If a method with the specified name is
 565   // found the index to the first method is returned, and 'end' is filled in
 566   // with the index of first non-name-matching method.  If no method is found
 567   // -1 is returned.
 568   int find_method_by_name(Symbol* name, int* end);
 569   static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
 570 
 571   // constant pool
 572   ConstantPool* constants() const        { return _constants; }
 573   void set_constants(ConstantPool* c)    { _constants = c; }
 574 
 575   // protection domain
 576   oop protection_domain() const;
 577 
 578   // signers
 579   objArrayOop signers() const;
 580 
 581   // host class
 582   Klass* host_klass() const              {
 583     Klass** hk = (Klass**)adr_host_klass();
 584     if (hk == NULL) {
 585       assert(!is_anonymous(), "Anonymous classes have host klasses");
 586       return NULL;
 587     } else {
 588       assert(*hk != NULL, "host klass should always be set if the address is not null");
 589       assert(is_anonymous(), "Only anonymous classes have host klasses");
 590       return *hk;
 591     }
 592   }
 593   void set_host_klass(Klass* host)            {
 594     assert(is_anonymous(), "not anonymous");
 595     Klass** addr = (Klass**)adr_host_klass();
 596     assert(addr != NULL, "no reversed space");
 597     if (addr != NULL) {
 598       *addr = host;
 599     }
 600   }
 601   bool has_host_klass() const              {
 602     return adr_host_klass() != NULL;
 603   }
 604   bool is_anonymous() const                {
 605     return (_misc_flags & _misc_is_anonymous) != 0;
 606   }
 607   void set_is_anonymous(bool value)        {
 608     if (value) {
 609       _misc_flags |= _misc_is_anonymous;
 610     } else {
 611       _misc_flags &= ~_misc_is_anonymous;
 612     }
 613   }
 614 
 615   // Oop that keeps the metadata for this class from being unloaded
 616   // in places where the metadata is stored in other places, like nmethods
 617   oop klass_holder() const {
 618     return is_anonymous() ? java_mirror() : class_loader();
 619   }
 620 
 621   bool is_contended() const                {
 622     return (_misc_flags & _misc_is_contended) != 0;
 623   }
 624   void set_is_contended(bool value)        {
 625     if (value) {
 626       _misc_flags |= _misc_is_contended;
 627     } else {
 628       _misc_flags &= ~_misc_is_contended;
 629     }
 630   }
 631 
 632   // source file name
 633   Symbol* source_file_name() const               {
 634     return (_source_file_name_index == 0) ?
 635       (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
 636   }
 637   u2 source_file_name_index() const              {
 638     return _source_file_name_index;
 639   }
 640   void set_source_file_name_index(u2 sourcefile_index) {
 641     _source_file_name_index = sourcefile_index;
 642   }
 643 
 644   // minor and major version numbers of class file
 645   u2 minor_version() const                 { return _minor_version; }
 646   void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
 647   u2 major_version() const                 { return _major_version; }
 648   void set_major_version(u2 major_version) { _major_version = major_version; }
 649 
 650   // source debug extension
 651   char* source_debug_extension() const     { return _source_debug_extension; }
 652   void set_source_debug_extension(char* array, int length);
 653 
 654   // symbol unloading support (refcount already added)
 655   Symbol* array_name()                     { return _array_name; }
 656   void set_array_name(Symbol* name)        { assert(_array_name == NULL  || name == NULL, "name already created"); _array_name = name; }
 657 
 658   // nonstatic oop-map blocks
 659   static int nonstatic_oop_map_size(unsigned int oop_map_count) {
 660     return oop_map_count * OopMapBlock::size_in_words();
 661   }
 662   unsigned int nonstatic_oop_map_count() const {
 663     return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
 664   }
 665   int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
 666   void set_nonstatic_oop_map_size(int words) {
 667     _nonstatic_oop_map_size = words;
 668   }
 669 
 670   // RedefineClasses() support for previous versions:
 671   void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
 672 
 673   InstanceKlass* previous_versions() const { return _previous_versions; }
 674 
 675   bool has_been_redefined() const {
 676     return (_misc_flags & _misc_has_been_redefined) != 0;
 677   }
 678   void set_has_been_redefined() {
 679     _misc_flags |= _misc_has_been_redefined;
 680   }
 681 
 682   void init_previous_versions() {
 683     _previous_versions = NULL;
 684   }
 685 
 686 
 687   InstanceKlass* get_klass_version(int version) {
 688     for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
 689       if (ik->constants()->version() == version) {
 690         return ik;
 691       }
 692     }
 693     return NULL;
 694   }
 695 
 696   static void purge_previous_versions(InstanceKlass* ik);
 697 
 698   // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
 699   void set_cached_class_file(JvmtiCachedClassFileData *data) {
 700     _cached_class_file = data;
 701   }
 702   JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
 703   jint get_cached_class_file_len();
 704   unsigned char * get_cached_class_file_bytes();
 705 
 706   // JVMTI: Support for caching of field indices, types, and offsets
 707   void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
 708     _jvmti_cached_class_field_map = descriptor;
 709   }
 710   JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
 711     return _jvmti_cached_class_field_map;
 712   }
 713 
 714   bool has_default_methods() const {
 715     return (_misc_flags & _misc_has_default_methods) != 0;
 716   }
 717   void set_has_default_methods(bool b) {
 718     if (b) {
 719       _misc_flags |= _misc_has_default_methods;
 720     } else {
 721       _misc_flags &= ~_misc_has_default_methods;
 722     }
 723   }
 724 
 725   bool declares_default_methods() const {
 726     return (_misc_flags & _misc_declares_default_methods) != 0;
 727   }
 728   void set_declares_default_methods(bool b) {
 729     if (b) {
 730       _misc_flags |= _misc_declares_default_methods;
 731     } else {
 732       _misc_flags &= ~_misc_declares_default_methods;
 733     }
 734   }
 735 
 736   // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
 737   inline u2 next_method_idnum();
 738   void set_initial_method_idnum(u2 value)             { _idnum_allocated_count = value; }
 739 
 740   // generics support
 741   Symbol* generic_signature() const                   {
 742     return (_generic_signature_index == 0) ?
 743       (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
 744   }
 745   u2 generic_signature_index() const                  {
 746     return _generic_signature_index;
 747   }
 748   void set_generic_signature_index(u2 sig_index)      {
 749     _generic_signature_index = sig_index;
 750   }
 751 
 752   u2 enclosing_method_data(int offset);
 753   u2 enclosing_method_class_index() {
 754     return enclosing_method_data(enclosing_method_class_index_offset);
 755   }
 756   u2 enclosing_method_method_index() {
 757     return enclosing_method_data(enclosing_method_method_index_offset);
 758   }
 759   void set_enclosing_method_indices(u2 class_index,
 760                                     u2 method_index);
 761 
 762   // jmethodID support
 763   static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
 764                      methodHandle method_h);
 765   static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
 766                      size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
 767                      jmethodID* to_dealloc_id_p,
 768                      jmethodID** to_dealloc_jmeths_p);
 769   static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
 770                 size_t *length_p, jmethodID* id_p);
 771   jmethodID jmethod_id_or_null(Method* method);
 772 
 773   // annotations support
 774   Annotations* annotations() const          { return _annotations; }
 775   void set_annotations(Annotations* anno)   { _annotations = anno; }
 776 
 777   AnnotationArray* class_annotations() const {
 778     return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
 779   }
 780   Array<AnnotationArray*>* fields_annotations() const {
 781     return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
 782   }
 783   AnnotationArray* class_type_annotations() const {
 784     return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
 785   }
 786   Array<AnnotationArray*>* fields_type_annotations() const {
 787     return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
 788   }
 789   // allocation
 790   instanceOop allocate_instance(TRAPS);
 791 
 792   // additional member function to return a handle
 793   instanceHandle allocate_instance_handle(TRAPS)      { return instanceHandle(THREAD, allocate_instance(THREAD)); }
 794 
 795   objArrayOop allocate_objArray(int n, int length, TRAPS);
 796   // Helper function
 797   static instanceOop register_finalizer(instanceOop i, TRAPS);
 798 
 799   // Check whether reflection/jni/jvm code is allowed to instantiate this class;
 800   // if not, throw either an Error or an Exception.
 801   virtual void check_valid_for_instantiation(bool throwError, TRAPS);
 802 
 803   // initialization
 804   void call_class_initializer(TRAPS);
 805   void set_initialization_state_and_notify(ClassState state, TRAPS);
 806 
 807   // OopMapCache support
 808   OopMapCache* oop_map_cache()               { return _oop_map_cache; }
 809   void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
 810   void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
 811 
 812   // JNI identifier support (for static fields - for jni performance)
 813   JNIid* jni_ids()                               { return _jni_ids; }
 814   void set_jni_ids(JNIid* ids)                   { _jni_ids = ids; }
 815   JNIid* jni_id_for(int offset);
 816 
 817   // maintenance of deoptimization dependencies
 818   int mark_dependent_nmethods(DepChange& changes);
 819   void add_dependent_nmethod(nmethod* nm);
 820   void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
 821 
 822   // On-stack replacement support
 823   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
 824   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
 825   void add_osr_nmethod(nmethod* n);
 826   void remove_osr_nmethod(nmethod* n);
 827   int mark_osr_nmethods(const Method* m);
 828   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
 829 
 830   // Breakpoint support (see methods on Method* for details)
 831   BreakpointInfo* breakpoints() const       { return _breakpoints; };
 832   void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
 833 
 834   // support for stub routines
 835   static ByteSize init_state_offset()  { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
 836   TRACE_DEFINE_OFFSET;
 837   static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
 838 
 839   // subclass/subinterface checks
 840   bool implements_interface(Klass* k) const;
 841   bool is_same_or_direct_interface(Klass* k) const;
 842 
 843 #ifdef ASSERT
 844   // check whether this class or one of its superclasses was redefined
 845   bool has_redefined_this_or_super() const;
 846 #endif
 847 
 848   // Access to the implementor of an interface.
 849   Klass* implementor() const
 850   {
 851     Klass** k = adr_implementor();
 852     if (k == NULL) {
 853       return NULL;
 854     } else {
 855       return *k;
 856     }
 857   }
 858 
 859   void set_implementor(Klass* k) {
 860     assert(is_interface(), "not interface");
 861     Klass** addr = adr_implementor();
 862     assert(addr != NULL, "null addr");
 863     if (addr != NULL) {
 864       *addr = k;
 865     }
 866   }
 867 
 868   int  nof_implementors() const       {
 869     Klass* k = implementor();
 870     if (k == NULL) {
 871       return 0;
 872     } else if (k != this) {
 873       return 1;
 874     } else {
 875       return 2;
 876     }
 877   }
 878 
 879   void add_implementor(Klass* k);  // k is a new class that implements this interface
 880   void init_implementor();           // initialize
 881 
 882   // link this class into the implementors list of every interface it implements
 883   void process_interfaces(Thread *thread);
 884 
 885   // virtual operations from Klass
 886   bool is_leaf_class() const               { return _subklass == NULL; }
 887   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
 888   bool compute_is_subtype_of(Klass* k);
 889   bool can_be_primary_super_slow() const;
 890   int oop_size(oop obj)  const             { return size_helper(); }
 891   bool oop_is_instance_slow() const        { return true; }
 892 
 893   // Iterators
 894   void do_local_static_fields(FieldClosure* cl);
 895   void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
 896   void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
 897 
 898   void methods_do(void f(Method* method));
 899   void array_klasses_do(void f(Klass* k));
 900   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
 901   bool super_types_do(SuperTypeClosure* blk);
 902 
 903   // Casting from Klass*
 904   static InstanceKlass* cast(Klass* k) {
 905     assert(k == NULL || k->is_klass(), "must be");
 906     assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
 907     return (InstanceKlass*) k;
 908   }
 909 
 910   InstanceKlass* java_super() const {
 911     return (super() == NULL) ? NULL : cast(super());
 912   }
 913 
 914   // Sizing (in words)
 915   static int header_size()            { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
 916 
 917   static int size(int vtable_length, int itable_length,
 918                   int nonstatic_oop_map_size,
 919                   bool is_interface, bool is_anonymous) {
 920     return align_object_size(header_size() +
 921            align_object_offset(vtable_length) +
 922            align_object_offset(itable_length) +
 923            ((is_interface || is_anonymous) ?
 924              align_object_offset(nonstatic_oop_map_size) :
 925              nonstatic_oop_map_size) +
 926            (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
 927            (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
 928   }
 929   int size() const                    { return size(vtable_length(),
 930                                                itable_length(),
 931                                                nonstatic_oop_map_size(),
 932                                                is_interface(),
 933                                                is_anonymous());
 934   }
 935 #if INCLUDE_SERVICES
 936   virtual void collect_statistics(KlassSizeStats *sz) const;
 937 #endif
 938 
 939   static int vtable_start_offset()    { return header_size(); }
 940   static int vtable_length_offset()   { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
 941 
 942   intptr_t* start_of_vtable() const        { return ((intptr_t*)this) + vtable_start_offset(); }
 943   intptr_t* start_of_itable() const        { return start_of_vtable() + align_object_offset(vtable_length()); }
 944   int  itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
 945 
 946   intptr_t* end_of_itable() const          { return start_of_itable() + itable_length(); }
 947 
 948   address static_field_addr(int offset);
 949 
 950   OopMapBlock* start_of_nonstatic_oop_maps() const {
 951     return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
 952   }
 953 
 954   Klass** end_of_nonstatic_oop_maps() const {
 955     return (Klass**)(start_of_nonstatic_oop_maps() +
 956                      nonstatic_oop_map_count());
 957   }
 958 
 959   Klass** adr_implementor() const {
 960     if (is_interface()) {
 961       return (Klass**)end_of_nonstatic_oop_maps();
 962     } else {
 963       return NULL;
 964     }
 965   };
 966 
 967   Klass** adr_host_klass() const {
 968     if (is_anonymous()) {
 969       Klass** adr_impl = adr_implementor();
 970       if (adr_impl != NULL) {
 971         return adr_impl + 1;
 972       } else {
 973         return end_of_nonstatic_oop_maps();
 974       }
 975     } else {
 976       return NULL;
 977     }
 978   }
 979 
 980   // Use this to return the size of an instance in heap words:
 981   int size_helper() const {
 982     return layout_helper_to_size_helper(layout_helper());
 983   }
 984 
 985   // This bit is initialized in classFileParser.cpp.
 986   // It is false under any of the following conditions:
 987   //  - the class is abstract (including any interface)
 988   //  - the class has a finalizer (if !RegisterFinalizersAtInit)
 989   //  - the class size is larger than FastAllocateSizeLimit
 990   //  - the class is java/lang/Class, which cannot be allocated directly
 991   bool can_be_fastpath_allocated() const {
 992     return !layout_helper_needs_slow_path(layout_helper());
 993   }
 994 
 995   // Java vtable/itable
 996   klassVtable* vtable() const;        // return new klassVtable wrapper
 997   inline Method* method_at_vtable(int index);
 998   klassItable* itable() const;        // return new klassItable wrapper
 999   Method* method_at_itable(Klass* holder, int index, TRAPS);
1000 
1001 #if INCLUDE_JVMTI
1002   void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1003 #endif // INCLUDE_JVMTI
1004 
1005   // Garbage collection
1006   void oop_follow_contents(oop obj);
1007   int  oop_adjust_pointers(oop obj);
1008 
1009   void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1010   void clean_implementors_list(BoolObjectClosure* is_alive);
1011   void clean_method_data(BoolObjectClosure* is_alive);
1012   void clean_dependent_nmethods();
1013 
1014   // Explicit metaspace deallocation of fields
1015   // For RedefineClasses and class file parsing errors, we need to deallocate
1016   // instanceKlasses and the metadata they point to.
1017   void deallocate_contents(ClassLoaderData* loader_data);
1018   static void deallocate_methods(ClassLoaderData* loader_data,
1019                                  Array<Method*>* methods);
1020   void static deallocate_interfaces(ClassLoaderData* loader_data,
1021                                     Klass* super_klass,
1022                                     Array<Klass*>* local_interfaces,
1023                                     Array<Klass*>* transitive_interfaces);
1024 
1025   // The constant pool is on stack if any of the methods are executing or
1026   // referenced by handles.
1027   bool on_stack() const { return _constants->on_stack(); }
1028 
1029   // callbacks for actions during class unloading
1030   static void notify_unload_class(InstanceKlass* ik);
1031   static void release_C_heap_structures(InstanceKlass* ik);
1032 
1033   // Parallel Scavenge and Parallel Old
1034   PARALLEL_GC_DECLS
1035 
1036   // Naming
1037   const char* signature_name() const;
1038 
1039   // Iterators
1040   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1041     return oop_oop_iterate_v(obj, blk);
1042   }
1043 
1044   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1045     return oop_oop_iterate_v_m(obj, blk, mr);
1046   }
1047 
1048 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)      \
1049   int  oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);           \
1050   int  oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk,        \
1051                                       MemRegion mr);
1052 
1053   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
1054   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
1055 
1056 #if INCLUDE_ALL_GCS
1057 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1058   int  oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1059 
1060   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1061   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1062 #endif // INCLUDE_ALL_GCS
1063 
1064   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
1065 
1066 public:
1067   void set_in_error_state() {
1068     assert(DumpSharedSpaces, "only call this when dumping archive");
1069     _init_state = initialization_error;
1070   }
1071   bool check_sharing_error_state();
1072 
1073 private:
1074   // initialization state
1075 #ifdef ASSERT
1076   void set_init_state(ClassState state);
1077 #else
1078   void set_init_state(ClassState state) { _init_state = (u1)state; }
1079 #endif
1080   void set_rewritten()                  { _misc_flags |= _misc_rewritten; }
1081   void set_init_thread(Thread *thread)  { _init_thread = thread; }
1082 
1083   // The RedefineClasses() API can cause new method idnums to be needed
1084   // which will cause the caches to grow. Safety requires different
1085   // cache management logic if the caches can grow instead of just
1086   // going from NULL to non-NULL.
1087   bool idnum_can_increment() const      { return has_been_redefined(); }
1088   jmethodID* methods_jmethod_ids_acquire() const
1089          { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1090   void release_set_methods_jmethod_ids(jmethodID* jmeths)
1091          { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1092 
1093   // Lock during initialization
1094 public:
1095   // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1096   // Must be one per class and it has to be a VM internal object so java code
1097   // cannot lock it (like the mirror).
1098   // It has to be an object not a Mutex because it's held through java calls.
1099   oop init_lock() const;
1100 private:
1101   void fence_and_clear_init_lock();
1102 
1103   // Static methods that are used to implement member methods where an exposed this pointer
1104   // is needed due to possible GCs
1105   static bool link_class_impl                           (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1106   static bool verify_code                               (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1107   static void initialize_impl                           (instanceKlassHandle this_oop, TRAPS);
1108   static void initialize_super_interfaces               (instanceKlassHandle this_oop, TRAPS);
1109   static void eager_initialize_impl                     (instanceKlassHandle this_oop);
1110   static void set_initialization_state_and_notify_impl  (instanceKlassHandle this_oop, ClassState state, TRAPS);
1111   static void call_class_initializer_impl               (instanceKlassHandle this_oop, TRAPS);
1112   static Klass* array_klass_impl                      (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1113   static void do_local_static_fields_impl               (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1114   /* jni_id_for_impl for jfieldID only */
1115   static JNIid* jni_id_for_impl                         (instanceKlassHandle this_oop, int offset);
1116 
1117   // Returns the array class for the n'th dimension
1118   Klass* array_klass_impl(bool or_null, int n, TRAPS);
1119 
1120   // Returns the array class with this class as element type
1121   Klass* array_klass_impl(bool or_null, TRAPS);
1122 
1123   // find a local method (returns NULL if not found)
1124   Method* find_method_impl(Symbol* name, Symbol* signature,
1125                            OverpassLookupMode overpass_mode,
1126                            StaticLookupMode static_mode,
1127                            PrivateLookupMode private_mode) const;
1128   static Method* find_method_impl(Array<Method*>* methods,
1129                                   Symbol* name, Symbol* signature,
1130                                   OverpassLookupMode overpass_mode,
1131                                   StaticLookupMode static_mode,
1132                                   PrivateLookupMode private_mode);
1133 
1134   // Free CHeap allocated fields.
1135   void release_C_heap_structures();
1136 
1137   // RedefineClasses support
1138   void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1139   void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1140 public:
1141   // CDS support - remove and restore oops from metadata. Oops are not shared.
1142   virtual void remove_unshareable_info();
1143   virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1144 
1145   // jvm support
1146   jint compute_modifier_flags(TRAPS) const;
1147 
1148   // JSR-292 support
1149   MemberNameTable* member_names() { return _member_names; }
1150   void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1151   oop add_member_name(Handle member_name, bool intern);
1152 
1153 public:
1154   // JVMTI support
1155   jint jvmti_class_status() const;
1156 
1157  public:
1158   // Printing
1159 #ifndef PRODUCT
1160   void print_on(outputStream* st) const;
1161 #endif
1162   void print_value_on(outputStream* st) const;
1163 
1164   void oop_print_value_on(oop obj, outputStream* st);
1165 
1166 #ifndef PRODUCT
1167   void oop_print_on      (oop obj, outputStream* st);
1168 
1169   void print_dependent_nmethods(bool verbose = false);
1170   bool is_dependent_nmethod(nmethod* nm);
1171 #endif
1172 
1173   const char* internal_name() const;
1174 
1175   // Verification
1176   void verify_on(outputStream* st);
1177 
1178   void oop_verify_on(oop obj, outputStream* st);
1179 };
1180 
1181 inline Method* InstanceKlass::method_at_vtable(int index)  {
1182 #ifndef PRODUCT
1183   assert(index >= 0, "valid vtable index");
1184   if (DebugVtables) {
1185     verify_vtable_index(index);
1186   }
1187 #endif
1188   vtableEntry* ve = (vtableEntry*)start_of_vtable();
1189   return ve[index].method();
1190 }
1191 
1192 // for adding methods
1193 // UNSET_IDNUM return means no more ids available
1194 inline u2 InstanceKlass::next_method_idnum() {
1195   if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1196     return ConstMethod::UNSET_IDNUM; // no more ids available
1197   } else {
1198     return _idnum_allocated_count++;
1199   }
1200 }
1201 
1202 
1203 /* JNIid class for jfieldIDs only */
1204 class JNIid: public CHeapObj<mtClass> {
1205   friend class VMStructs;
1206  private:
1207   Klass*             _holder;
1208   JNIid*             _next;
1209   int                _offset;
1210 #ifdef ASSERT
1211   bool               _is_static_field_id;
1212 #endif
1213 
1214  public:
1215   // Accessors
1216   Klass* holder() const           { return _holder; }
1217   int offset() const              { return _offset; }
1218   JNIid* next()                   { return _next; }
1219   // Constructor
1220   JNIid(Klass* holder, int offset, JNIid* next);
1221   // Identifier lookup
1222   JNIid* find(int offset);
1223 
1224   bool find_local_field(fieldDescriptor* fd) {
1225     return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1226   }
1227 
1228   static void deallocate(JNIid* id);
1229   // Debugging
1230 #ifdef ASSERT
1231   bool is_static_field_id() const { return _is_static_field_id; }
1232   void set_is_static_field_id()   { _is_static_field_id = true; }
1233 #endif
1234   void verify(Klass* holder);
1235 };
1236 
1237 
1238 //
1239 // nmethodBucket is used to record dependent nmethods for
1240 // deoptimization.  nmethod dependencies are actually <klass, method>
1241 // pairs but we really only care about the klass part for purposes of
1242 // finding nmethods which might need to be deoptimized.  Instead of
1243 // recording the method, a count of how many times a particular nmethod
1244 // was recorded is kept.  This ensures that any recording errors are
1245 // noticed since an nmethod should be removed as many times are it's
1246 // added.
1247 //
1248 class nmethodBucket: public CHeapObj<mtClass> {
1249   friend class VMStructs;
1250  private:
1251   nmethod*       _nmethod;
1252   int            _count;
1253   nmethodBucket* _next;
1254 
1255  public:
1256   nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1257     _nmethod = nmethod;
1258     _next = next;
1259     _count = 1;
1260   }
1261   int count()                             { return _count; }
1262   int increment()                         { _count += 1; return _count; }
1263   int decrement();
1264   nmethodBucket* next()                   { return _next; }
1265   void set_next(nmethodBucket* b)         { _next = b; }
1266   nmethod* get_nmethod()                  { return _nmethod; }
1267 };
1268 
1269 // An iterator that's used to access the inner classes indices in the
1270 // InstanceKlass::_inner_classes array.
1271 class InnerClassesIterator : public StackObj {
1272  private:
1273   Array<jushort>* _inner_classes;
1274   int _length;
1275   int _idx;
1276  public:
1277 
1278   InnerClassesIterator(instanceKlassHandle k) {
1279     _inner_classes = k->inner_classes();
1280     if (k->inner_classes() != NULL) {
1281       _length = _inner_classes->length();
1282       // The inner class array's length should be the multiple of
1283       // inner_class_next_offset if it only contains the InnerClasses
1284       // attribute data, or it should be
1285       // n*inner_class_next_offset+enclosing_method_attribute_size
1286       // if it also contains the EnclosingMethod data.
1287       assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1288               _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1289              "just checking");
1290       // Remove the enclosing_method portion if exists.
1291       if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1292         _length -= InstanceKlass::enclosing_method_attribute_size;
1293       }
1294     } else {
1295       _length = 0;
1296     }
1297     _idx = 0;
1298   }
1299 
1300   int length() const {
1301     return _length;
1302   }
1303 
1304   void next() {
1305     _idx += InstanceKlass::inner_class_next_offset;
1306   }
1307 
1308   bool done() const {
1309     return (_idx >= _length);
1310   }
1311 
1312   u2 inner_class_info_index() const {
1313     return _inner_classes->at(
1314                _idx + InstanceKlass::inner_class_inner_class_info_offset);
1315   }
1316 
1317   void set_inner_class_info_index(u2 index) {
1318     _inner_classes->at_put(
1319                _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1320   }
1321 
1322   u2 outer_class_info_index() const {
1323     return _inner_classes->at(
1324                _idx + InstanceKlass::inner_class_outer_class_info_offset);
1325   }
1326 
1327   void set_outer_class_info_index(u2 index) {
1328     _inner_classes->at_put(
1329                _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1330   }
1331 
1332   u2 inner_name_index() const {
1333     return _inner_classes->at(
1334                _idx + InstanceKlass::inner_class_inner_name_offset);
1335   }
1336 
1337   void set_inner_name_index(u2 index) {
1338     _inner_classes->at_put(
1339                _idx + InstanceKlass::inner_class_inner_name_offset, index);
1340   }
1341 
1342   u2 inner_access_flags() const {
1343     return _inner_classes->at(
1344                _idx + InstanceKlass::inner_class_access_flags_offset);
1345   }
1346 };
1347 
1348 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP