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 "gc/shared/specialized_oop_closures.hpp"
  30 #include "memory/referenceType.hpp"
  31 #include "oops/annotations.hpp"
  32 #include "oops/constMethod.hpp"
  33 #include "oops/fieldInfo.hpp"
  34 #include "oops/instanceOop.hpp"
  35 #include "oops/klassVtable.hpp"
  36 #include "runtime/handles.hpp"
  37 #include "runtime/os.hpp"
  38 #include "trace/traceMacros.hpp"
  39 #include "utilities/accessFlags.hpp"
  40 #include "utilities/bitMap.inline.hpp"
  41 #include "utilities/macros.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 embedded field layout (after declared fields):
  47 //    [EMBEDDED Java vtable             ] size in words = vtable_len
  48 //    [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
  49 //      The embedded nonstatic oop-map blocks are short pairs (offset, length)
  50 //      indicating where oops are located in instances of this klass.
  51 //    [EMBEDDED implementor of the interface] only exist for interface
  52 //    [EMBEDDED host klass        ] only exist for an anonymous class (JSR 292 enabled)
  53 
  54 
  55 // forward declaration for class -- see below for definition
  56 class BreakpointInfo;
  57 class ClassFileParser;
  58 class DepChange;
  59 class DependencyContext;
  60 class fieldDescriptor;
  61 class jniIdMapBase;
  62 class JNIid;
  63 class JvmtiCachedClassFieldMap;
  64 class MemberNameTable;
  65 class SuperTypeClosure;
  66 
  67 // This is used in iterators below.
  68 class FieldClosure: public StackObj {
  69 public:
  70   virtual void do_field(fieldDescriptor* fd) = 0;
  71 };
  72 
  73 #ifndef PRODUCT
  74 // Print fields.
  75 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
  76 class FieldPrinter: public FieldClosure {
  77    oop _obj;
  78    outputStream* _st;
  79  public:
  80    FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
  81    void do_field(fieldDescriptor* fd);
  82 };
  83 #endif  // !PRODUCT
  84 
  85 // ValueObjs embedded in klass. Describes where oops are located in instances of
  86 // this klass.
  87 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
  88  public:
  89   // Byte offset of the first oop mapped by this block.
  90   int offset() const          { return _offset; }
  91   void set_offset(int offset) { _offset = offset; }
  92 
  93   // Number of oops in this block.
  94   uint count() const         { return _count; }
  95   void set_count(uint count) { _count = count; }
  96 
  97   // sizeof(OopMapBlock) in HeapWords.
  98   static const int size_in_words() {
  99     return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
 100       LogHeapWordSize;
 101   }
 102 
 103  private:
 104   int  _offset;
 105   uint _count;
 106 };
 107 
 108 struct JvmtiCachedClassFileData;
 109 
 110 class InstanceKlass: public Klass {
 111   friend class VMStructs;
 112   friend class JVMCIVMStructs;
 113   friend class ClassFileParser;
 114   friend class CompileReplay;
 115 
 116  protected:
 117   InstanceKlass(const ClassFileParser& parser, unsigned kind);
 118 
 119  public:
 120   InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
 121 
 122   // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
 123   // of the class loading & initialization procedure, and the use of the states.
 124   enum ClassState {
 125     allocated,                          // allocated (but not yet linked)
 126     loaded,                             // loaded and inserted in class hierarchy (but not linked yet)
 127     linked,                             // successfully linked/verified (but not initialized yet)
 128     being_initialized,                  // currently running class initializer
 129     fully_initialized,                  // initialized (successfull final state)
 130     initialization_error                // error happened during initialization
 131   };
 132 
 133   static int number_of_instance_classes() { return _total_instanceKlass_count; }
 134 
 135  private:
 136   static volatile int _total_instanceKlass_count;
 137   static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
 138 
 139  protected:
 140   // Annotations for this class
 141   Annotations*    _annotations;
 142   // Array classes holding elements of this class.
 143   Klass*          _array_klasses;
 144   // Constant pool for this class.
 145   ConstantPool* _constants;
 146   // The InnerClasses attribute and EnclosingMethod attribute. The
 147   // _inner_classes is an array of shorts. If the class has InnerClasses
 148   // attribute, then the _inner_classes array begins with 4-tuples of shorts
 149   // [inner_class_info_index, outer_class_info_index,
 150   // inner_name_index, inner_class_access_flags] for the InnerClasses
 151   // attribute. If the EnclosingMethod attribute exists, it occupies the
 152   // last two shorts [class_index, method_index] of the array. If only
 153   // the InnerClasses attribute exists, the _inner_classes array length is
 154   // number_of_inner_classes * 4. If the class has both InnerClasses
 155   // and EnclosingMethod attributes the _inner_classes array length is
 156   // number_of_inner_classes * 4 + enclosing_method_attribute_size.
 157   Array<jushort>* _inner_classes;
 158 
 159   // the source debug extension for this klass, NULL if not specified.
 160   // Specified as UTF-8 string without terminating zero byte in the classfile,
 161   // it is stored in the instanceklass as a NULL-terminated UTF-8 string
 162   const char*     _source_debug_extension;
 163   // Array name derived from this class which needs unreferencing
 164   // if this class is unloaded.
 165   Symbol*         _array_name;
 166 
 167   // Number of heapOopSize words used by non-static fields in this klass
 168   // (including inherited fields but after header_size()).
 169   int             _nonstatic_field_size;
 170   int             _static_field_size;    // number words used by static fields (oop and non-oop) in this klass
 171   // Constant pool index to the utf8 entry of the Generic signature,
 172   // or 0 if none.
 173   u2              _generic_signature_index;
 174   // Constant pool index to the utf8 entry for the name of source file
 175   // containing this klass, 0 if not specified.
 176   u2              _source_file_name_index;
 177   u2              _static_oop_field_count;// number of static oop fields in this klass
 178   u2              _java_fields_count;    // The number of declared Java fields
 179   int             _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
 180 
 181   // _is_marked_dependent can be set concurrently, thus cannot be part of the
 182   // _misc_flags.
 183   bool            _is_marked_dependent;  // used for marking during flushing and deoptimization
 184 
 185   // The low two bits of _misc_flags contains the kind field.
 186   // This can be used to quickly discriminate among the four kinds of
 187   // InstanceKlass.
 188 
 189   static const unsigned _misc_kind_field_size = 2;
 190   static const unsigned _misc_kind_field_pos  = 0;
 191   static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
 192 
 193   static const unsigned _misc_kind_other        = 0; // concrete InstanceKlass
 194   static const unsigned _misc_kind_reference    = 1; // InstanceRefKlass
 195   static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
 196   static const unsigned _misc_kind_mirror       = 3; // InstanceMirrorKlass
 197 
 198   // Start after _misc_kind field.
 199   enum {
 200     _misc_rewritten                = 1 << 2, // methods rewritten.
 201     _misc_has_nonstatic_fields     = 1 << 3, // for sizing with UseCompressedOops
 202     _misc_should_verify_class      = 1 << 4, // allow caching of preverification
 203     _misc_is_anonymous             = 1 << 5, // has embedded _host_klass field
 204     _misc_is_contended             = 1 << 6, // marked with contended annotation
 205     _misc_has_default_methods      = 1 << 7, // class/superclass/implemented interfaces has default methods
 206     _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
 207     _misc_has_been_redefined       = 1 << 9, // class has been redefined
 208     _misc_is_scratch_class         = 1 << 10 // class is the redefined scratch class
 209   };
 210   u2              _misc_flags;
 211   u2              _minor_version;        // minor version number of class file
 212   u2              _major_version;        // major version number of class file
 213   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
 214   int             _vtable_len;           // length of Java vtable (in words)
 215   int             _itable_len;           // length of Java itable (in words)
 216   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
 217   MemberNameTable* _member_names;        // Member names
 218   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
 219   jmethodID*      _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
 220   intptr_t        _dep_context;          // packed DependencyContext structure
 221   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
 222   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
 223   // Linked instanceKlasses of previous versions
 224   InstanceKlass* _previous_versions;
 225   // JVMTI fields can be moved to their own structure - see 6315920
 226   // JVMTI: cached class file, before retransformable agent modified it in CFLH
 227   JvmtiCachedClassFileData* _cached_class_file;
 228 
 229   volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
 230 
 231   // Class states are defined as ClassState (see above).
 232   // Place the _init_state here to utilize the unused 2-byte after
 233   // _idnum_allocated_count.
 234   u1              _init_state;                    // state of class
 235   u1              _reference_type;                // reference type
 236 
 237   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
 238 
 239   NOT_PRODUCT(int _verify_count;)  // to avoid redundant verifies
 240 
 241   // Method array.
 242   Array<Method*>* _methods;
 243   // Default Method Array, concrete methods inherited from interfaces
 244   Array<Method*>* _default_methods;
 245   // Interface (Klass*s) this class declares locally to implement.
 246   Array<Klass*>* _local_interfaces;
 247   // Interface (Klass*s) this class implements transitively.
 248   Array<Klass*>* _transitive_interfaces;
 249   // Int array containing the original order of method in the class file (for JVMTI).
 250   Array<int>*     _method_ordering;
 251   // Int array containing the vtable_indices for default_methods
 252   // offset matches _default_methods offset
 253   Array<int>*     _default_vtable_indices;
 254 
 255   // Instance and static variable information, starts with 6-tuples of shorts
 256   // [access, name index, sig index, initval index, low_offset, high_offset]
 257   // for all fields, followed by the generic signature data at the end of
 258   // the array. Only fields with generic signature attributes have the generic
 259   // signature data set in the array. The fields array looks like following:
 260   //
 261   // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
 262   // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
 263   //      ...
 264   // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
 265   //     [generic signature index]
 266   //     [generic signature index]
 267   //     ...
 268   Array<u2>*      _fields;
 269 
 270   // embedded Java vtable follows here
 271   // embedded Java itables follows here
 272   // embedded static fields follows here
 273   // embedded nonstatic oop-map blocks follows here
 274   // embedded implementor of this interface follows here
 275   //   The embedded implementor only exists if the current klass is an
 276   //   iterface. The possible values of the implementor fall into following
 277   //   three cases:
 278   //     NULL: no implementor.
 279   //     A Klass* that's not itself: one implementor.
 280   //     Itself: more than one implementors.
 281   // embedded host klass follows here
 282   //   The embedded host klass only exists in an anonymous class for
 283   //   dynamic language support (JSR 292 enabled). The host class grants
 284   //   its access privileges to this class also. The host class is either
 285   //   named, or a previously loaded anonymous class. A non-anonymous class
 286   //   or an anonymous class loaded through normal classloading does not
 287   //   have this embedded field.
 288   //
 289 
 290   friend class SystemDictionary;
 291 
 292  public:
 293   bool has_nonstatic_fields() const        {
 294     return (_misc_flags & _misc_has_nonstatic_fields) != 0;
 295   }
 296   void set_has_nonstatic_fields(bool b)    {
 297     if (b) {
 298       _misc_flags |= _misc_has_nonstatic_fields;
 299     } else {
 300       _misc_flags &= ~_misc_has_nonstatic_fields;
 301     }
 302   }
 303 
 304   // field sizes
 305   int nonstatic_field_size() const         { return _nonstatic_field_size; }
 306   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
 307 
 308   int static_field_size() const            { return _static_field_size; }
 309   void set_static_field_size(int size)     { _static_field_size = size; }
 310 
 311   int static_oop_field_count() const       { return (int)_static_oop_field_count; }
 312   void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
 313 
 314   // Java vtable
 315   int  vtable_length() const               { return _vtable_len; }
 316   void set_vtable_length(int len)          { _vtable_len = len; }
 317 
 318   // Java itable
 319   int  itable_length() const               { return _itable_len; }
 320   void set_itable_length(int len)          { _itable_len = len; }
 321 
 322   // array klasses
 323   Klass* array_klasses() const             { return _array_klasses; }
 324   void set_array_klasses(Klass* k)         { _array_klasses = k; }
 325 
 326   // methods
 327   Array<Method*>* methods() const          { return _methods; }
 328   void set_methods(Array<Method*>* a)      { _methods = a; }
 329   Method* method_with_idnum(int idnum);
 330   Method* method_with_orig_idnum(int idnum);
 331   Method* method_with_orig_idnum(int idnum, int version);
 332 
 333   // method ordering
 334   Array<int>* method_ordering() const     { return _method_ordering; }
 335   void set_method_ordering(Array<int>* m) { _method_ordering = m; }
 336   void copy_method_ordering(const intArray* m, TRAPS);
 337 
 338   // default_methods
 339   Array<Method*>* default_methods() const  { return _default_methods; }
 340   void set_default_methods(Array<Method*>* a) { _default_methods = a; }
 341 
 342   // default method vtable_indices
 343   Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
 344   void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
 345   Array<int>* create_new_default_vtable_indices(int len, TRAPS);
 346 
 347   // interfaces
 348   Array<Klass*>* local_interfaces() const          { return _local_interfaces; }
 349   void set_local_interfaces(Array<Klass*>* a)      {
 350     guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
 351     _local_interfaces = a; }
 352 
 353   Array<Klass*>* transitive_interfaces() const     { return _transitive_interfaces; }
 354   void set_transitive_interfaces(Array<Klass*>* a) {
 355     guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
 356     _transitive_interfaces = a;
 357   }
 358 
 359  private:
 360   friend class fieldDescriptor;
 361   FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
 362 
 363  public:
 364   int     field_offset      (int index) const { return field(index)->offset(); }
 365   int     field_access_flags(int index) const { return field(index)->access_flags(); }
 366   Symbol* field_name        (int index) const { return field(index)->name(constants()); }
 367   Symbol* field_signature   (int index) const { return field(index)->signature(constants()); }
 368 
 369   // Number of Java declared fields
 370   int java_fields_count() const           { return (int)_java_fields_count; }
 371 
 372   Array<u2>* fields() const            { return _fields; }
 373   void set_fields(Array<u2>* f, u2 java_fields_count) {
 374     guarantee(_fields == NULL || f == NULL, "Just checking");
 375     _fields = f;
 376     _java_fields_count = java_fields_count;
 377   }
 378 
 379   // inner classes
 380   Array<u2>* inner_classes() const       { return _inner_classes; }
 381   void set_inner_classes(Array<u2>* f)   { _inner_classes = f; }
 382 
 383   enum InnerClassAttributeOffset {
 384     // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
 385     inner_class_inner_class_info_offset = 0,
 386     inner_class_outer_class_info_offset = 1,
 387     inner_class_inner_name_offset = 2,
 388     inner_class_access_flags_offset = 3,
 389     inner_class_next_offset = 4
 390   };
 391 
 392   enum EnclosingMethodAttributeOffset {
 393     enclosing_method_class_index_offset = 0,
 394     enclosing_method_method_index_offset = 1,
 395     enclosing_method_attribute_size = 2
 396   };
 397 
 398   // method override check
 399   bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
 400 
 401   // package
 402   bool is_same_class_package(const Klass* class2) const;
 403   bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
 404   static bool is_same_class_package(oop class_loader1,
 405                                     const Symbol* class_name1,
 406                                     oop class_loader2,
 407                                     const Symbol* class_name2);
 408 
 409   // find an enclosing class
 410   InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const {
 411     return compute_enclosing_class_impl(this, inner_is_member, THREAD);
 412   }
 413   static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self,
 414                                                      bool* inner_is_member,
 415                                                      TRAPS);
 416 
 417   // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
 418   static bool find_inner_classes_attr(instanceKlassHandle k,
 419                                       int* ooff, int* noff, TRAPS);
 420 
 421   // tell if two classes have the same enclosing class (at package level)
 422   bool is_same_package_member(const Klass* class2, TRAPS) const {
 423     return is_same_package_member_impl(this, class2, THREAD);
 424   }
 425   static bool is_same_package_member_impl(const InstanceKlass* self,
 426                                           const Klass* class2,
 427                                           TRAPS);
 428 
 429   // initialization state
 430   bool is_loaded() const                   { return _init_state >= loaded; }
 431   bool is_linked() const                   { return _init_state >= linked; }
 432   bool is_initialized() const              { return _init_state == fully_initialized; }
 433   bool is_not_initialized() const          { return _init_state <  being_initialized; }
 434   bool is_being_initialized() const        { return _init_state == being_initialized; }
 435   bool is_in_error_state() const           { return _init_state == initialization_error; }
 436   bool is_reentrant_initialization(Thread *thread)  { return thread == _init_thread; }
 437   ClassState  init_state()                 { return (ClassState)_init_state; }
 438   bool is_rewritten() const                { return (_misc_flags & _misc_rewritten) != 0; }
 439 
 440   // defineClass specified verification
 441   bool should_verify_class() const         {
 442     return (_misc_flags & _misc_should_verify_class) != 0;
 443   }
 444   void set_should_verify_class(bool value) {
 445     if (value) {
 446       _misc_flags |= _misc_should_verify_class;
 447     } else {
 448       _misc_flags &= ~_misc_should_verify_class;
 449     }
 450   }
 451 
 452   // marking
 453   bool is_marked_dependent() const         { return _is_marked_dependent; }
 454   void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
 455 
 456   // initialization (virtuals from Klass)
 457   bool should_be_initialized() const;  // means that initialize should be called
 458   void initialize(TRAPS);
 459   void link_class(TRAPS);
 460   bool link_class_or_fail(TRAPS); // returns false on failure
 461   void unlink_class();
 462   void rewrite_class(TRAPS);
 463   void link_methods(TRAPS);
 464   Method* class_initializer();
 465 
 466   // set the class to initialized if no static initializer is present
 467   void eager_initialize(Thread *thread);
 468 
 469   // reference type
 470   ReferenceType reference_type() const     { return (ReferenceType)_reference_type; }
 471   void set_reference_type(ReferenceType t) {
 472     assert(t == (u1)t, "overflow");
 473     _reference_type = (u1)t;
 474   }
 475 
 476   static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
 477 
 478   // find local field, returns true if found
 479   bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 480   // find field in direct superinterfaces, returns the interface in which the field is defined
 481   Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 482   // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 483   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 484   // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 485   Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
 486 
 487   // find a non-static or static field given its offset within the class.
 488   bool contains_field_offset(int offset) {
 489     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 490   }
 491 
 492   bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 493   bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 494 
 495   // find a local method (returns NULL if not found)
 496   Method* find_method(const Symbol* name, const Symbol* signature) const;
 497   static Method* find_method(const Array<Method*>* methods,
 498                              const Symbol* name,
 499                              const Symbol* signature);
 500 
 501   // find a local method, but skip static methods
 502   Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
 503   static Method* find_instance_method(const Array<Method*>* methods,
 504                                       const Symbol* name,
 505                                       const Symbol* signature);
 506 
 507   // find a local method (returns NULL if not found)
 508   Method* find_local_method(const Symbol* name,
 509                             const Symbol* signature,
 510                             OverpassLookupMode overpass_mode,
 511                             StaticLookupMode static_mode,
 512                             PrivateLookupMode private_mode) const;
 513 
 514   // find a local method from given methods array (returns NULL if not found)
 515   static Method* find_local_method(const Array<Method*>* methods,
 516                                    const Symbol* name,
 517                                    const Symbol* signature,
 518                                    OverpassLookupMode overpass_mode,
 519                                    StaticLookupMode static_mode,
 520                                    PrivateLookupMode private_mode);
 521 
 522   // find a local method index in methods or default_methods (returns -1 if not found)
 523   static int find_method_index(const Array<Method*>* methods,
 524                                const Symbol* name,
 525                                const Symbol* signature,
 526                                OverpassLookupMode overpass_mode,
 527                                StaticLookupMode static_mode,
 528                                PrivateLookupMode private_mode);
 529 
 530   // lookup operation (returns NULL if not found)
 531   Method* uncached_lookup_method(const Symbol* name,
 532                                  const Symbol* signature,
 533                                  OverpassLookupMode overpass_mode) const;
 534 
 535   // lookup a method in all the interfaces that this class implements
 536   // (returns NULL if not found)
 537   Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
 538 
 539   // lookup a method in local defaults then in all interfaces
 540   // (returns NULL if not found)
 541   Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
 542 
 543   // Find method indices by name.  If a method with the specified name is
 544   // found the index to the first method is returned, and 'end' is filled in
 545   // with the index of first non-name-matching method.  If no method is found
 546   // -1 is returned.
 547   int find_method_by_name(const Symbol* name, int* end) const;
 548   static int find_method_by_name(const Array<Method*>* methods,
 549                                  const Symbol* name, int* end);
 550 
 551   // constant pool
 552   ConstantPool* constants() const        { return _constants; }
 553   void set_constants(ConstantPool* c)    { _constants = c; }
 554 
 555   // protection domain
 556   oop protection_domain() const;
 557 
 558   // signers
 559   objArrayOop signers() const;
 560 
 561   // host class
 562   Klass* host_klass() const              {
 563     Klass** hk = (Klass**)adr_host_klass();
 564     if (hk == NULL) {
 565       return NULL;
 566     } else {
 567       assert(*hk != NULL, "host klass should always be set if the address is not null");
 568       return *hk;
 569     }
 570   }
 571   void set_host_klass(const Klass* host) {
 572     assert(is_anonymous(), "not anonymous");
 573     const Klass** addr = (const Klass**)adr_host_klass();
 574     assert(addr != NULL, "no reversed space");
 575     if (addr != NULL) {
 576       *addr = host;
 577     }
 578   }
 579   bool is_anonymous() const                {
 580     return (_misc_flags & _misc_is_anonymous) != 0;
 581   }
 582   void set_is_anonymous(bool value)        {
 583     if (value) {
 584       _misc_flags |= _misc_is_anonymous;
 585     } else {
 586       _misc_flags &= ~_misc_is_anonymous;
 587     }
 588   }
 589 
 590   // Oop that keeps the metadata for this class from being unloaded
 591   // in places where the metadata is stored in other places, like nmethods
 592   oop klass_holder() const {
 593     return is_anonymous() ? java_mirror() : class_loader();
 594   }
 595 
 596   bool is_contended() const                {
 597     return (_misc_flags & _misc_is_contended) != 0;
 598   }
 599   void set_is_contended(bool value)        {
 600     if (value) {
 601       _misc_flags |= _misc_is_contended;
 602     } else {
 603       _misc_flags &= ~_misc_is_contended;
 604     }
 605   }
 606 
 607   // source file name
 608   Symbol* source_file_name() const               {
 609     return (_source_file_name_index == 0) ?
 610       (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
 611   }
 612   u2 source_file_name_index() const              {
 613     return _source_file_name_index;
 614   }
 615   void set_source_file_name_index(u2 sourcefile_index) {
 616     _source_file_name_index = sourcefile_index;
 617   }
 618 
 619   // minor and major version numbers of class file
 620   u2 minor_version() const                 { return _minor_version; }
 621   void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
 622   u2 major_version() const                 { return _major_version; }
 623   void set_major_version(u2 major_version) { _major_version = major_version; }
 624 
 625   // source debug extension
 626   const char* source_debug_extension() const { return _source_debug_extension; }
 627   void set_source_debug_extension(const char* array, int length);
 628 
 629   // symbol unloading support (refcount already added)
 630   Symbol* array_name()                     { return _array_name; }
 631   void set_array_name(Symbol* name)        { assert(_array_name == NULL  || name == NULL, "name already created"); _array_name = name; }
 632 
 633   // nonstatic oop-map blocks
 634   static int nonstatic_oop_map_size(unsigned int oop_map_count) {
 635     return oop_map_count * OopMapBlock::size_in_words();
 636   }
 637   unsigned int nonstatic_oop_map_count() const {
 638     return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
 639   }
 640   int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
 641   void set_nonstatic_oop_map_size(int words) {
 642     _nonstatic_oop_map_size = words;
 643   }
 644 
 645   // RedefineClasses() support for previous versions:
 646   void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
 647 
 648   InstanceKlass* previous_versions() const { return _previous_versions; }
 649 
 650   InstanceKlass* get_klass_version(int version) {
 651     for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
 652       if (ik->constants()->version() == version) {
 653         return ik;
 654       }
 655     }
 656     return NULL;
 657   }
 658 
 659   bool has_been_redefined() const {
 660     return (_misc_flags & _misc_has_been_redefined) != 0;
 661   }
 662   void set_has_been_redefined() {
 663     _misc_flags |= _misc_has_been_redefined;
 664   }
 665 
 666   bool is_scratch_class() const {
 667     return (_misc_flags & _misc_is_scratch_class) != 0;
 668   }
 669 
 670   void set_is_scratch_class() {
 671     _misc_flags |= _misc_is_scratch_class;
 672   }
 673 
 674 private:
 675 
 676   void set_kind(unsigned kind) {
 677     assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
 678     unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
 679     unsigned flags = _misc_flags & ~fmask;
 680     _misc_flags = (flags | (kind << _misc_kind_field_pos));
 681   }
 682 
 683   bool is_kind(unsigned desired) const {
 684     unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
 685     return kind == desired;
 686   }
 687 
 688 public:
 689 
 690   // Other is anything that is not one of the more specialized kinds of InstanceKlass.
 691   bool is_other_instance_klass() const        { return is_kind(_misc_kind_other); }
 692   bool is_reference_instance_klass() const    { return is_kind(_misc_kind_reference); }
 693   bool is_mirror_instance_klass() const       { return is_kind(_misc_kind_mirror); }
 694   bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
 695 
 696   void init_previous_versions() {
 697     _previous_versions = NULL;
 698   }
 699 
 700  private:
 701   static int  _previous_version_count;
 702  public:
 703   static void purge_previous_versions(InstanceKlass* ik);
 704   static bool has_previous_versions() { return _previous_version_count > 0; }
 705 
 706   // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
 707   void set_cached_class_file(JvmtiCachedClassFileData *data) {
 708     _cached_class_file = data;
 709   }
 710   JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
 711   jint get_cached_class_file_len();
 712   unsigned char * get_cached_class_file_bytes();
 713 
 714   // JVMTI: Support for caching of field indices, types, and offsets
 715   void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
 716     _jvmti_cached_class_field_map = descriptor;
 717   }
 718   JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
 719     return _jvmti_cached_class_field_map;
 720   }
 721 
 722   bool has_default_methods() const {
 723     return (_misc_flags & _misc_has_default_methods) != 0;
 724   }
 725   void set_has_default_methods(bool b) {
 726     if (b) {
 727       _misc_flags |= _misc_has_default_methods;
 728     } else {
 729       _misc_flags &= ~_misc_has_default_methods;
 730     }
 731   }
 732 
 733   bool declares_default_methods() const {
 734     return (_misc_flags & _misc_declares_default_methods) != 0;
 735   }
 736   void set_declares_default_methods(bool b) {
 737     if (b) {
 738       _misc_flags |= _misc_declares_default_methods;
 739     } else {
 740       _misc_flags &= ~_misc_declares_default_methods;
 741     }
 742   }
 743 
 744   // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
 745   inline u2 next_method_idnum();
 746   void set_initial_method_idnum(u2 value)             { _idnum_allocated_count = value; }
 747 
 748   // generics support
 749   Symbol* generic_signature() const                   {
 750     return (_generic_signature_index == 0) ?
 751       (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
 752   }
 753   u2 generic_signature_index() const                  {
 754     return _generic_signature_index;
 755   }
 756   void set_generic_signature_index(u2 sig_index)      {
 757     _generic_signature_index = sig_index;
 758   }
 759 
 760   u2 enclosing_method_data(int offset) const;
 761   u2 enclosing_method_class_index() const {
 762     return enclosing_method_data(enclosing_method_class_index_offset);
 763   }
 764   u2 enclosing_method_method_index() {
 765     return enclosing_method_data(enclosing_method_method_index_offset);
 766   }
 767   void set_enclosing_method_indices(u2 class_index,
 768                                     u2 method_index);
 769 
 770   // jmethodID support
 771   static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
 772                      const methodHandle& method_h);
 773   static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
 774                      size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
 775                      jmethodID* to_dealloc_id_p,
 776                      jmethodID** to_dealloc_jmeths_p);
 777   static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
 778                 size_t *length_p, jmethodID* id_p);
 779   void ensure_space_for_methodids(int start_offset = 0);
 780   jmethodID jmethod_id_or_null(Method* method);
 781 
 782   // annotations support
 783   Annotations* annotations() const          { return _annotations; }
 784   void set_annotations(Annotations* anno)   { _annotations = anno; }
 785 
 786   AnnotationArray* class_annotations() const {
 787     return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
 788   }
 789   Array<AnnotationArray*>* fields_annotations() const {
 790     return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
 791   }
 792   AnnotationArray* class_type_annotations() const {
 793     return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
 794   }
 795   Array<AnnotationArray*>* fields_type_annotations() const {
 796     return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
 797   }
 798   // allocation
 799   instanceOop allocate_instance(TRAPS);
 800 
 801   // additional member function to return a handle
 802   instanceHandle allocate_instance_handle(TRAPS)      { return instanceHandle(THREAD, allocate_instance(THREAD)); }
 803 
 804   objArrayOop allocate_objArray(int n, int length, TRAPS);
 805   // Helper function
 806   static instanceOop register_finalizer(instanceOop i, TRAPS);
 807 
 808   // Check whether reflection/jni/jvm code is allowed to instantiate this class;
 809   // if not, throw either an Error or an Exception.
 810   virtual void check_valid_for_instantiation(bool throwError, TRAPS);
 811 
 812   // initialization
 813   void call_class_initializer(TRAPS);
 814   void set_initialization_state_and_notify(ClassState state, TRAPS);
 815 
 816   // OopMapCache support
 817   OopMapCache* oop_map_cache()               { return _oop_map_cache; }
 818   void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
 819   void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
 820 
 821   // JNI identifier support (for static fields - for jni performance)
 822   JNIid* jni_ids()                               { return _jni_ids; }
 823   void set_jni_ids(JNIid* ids)                   { _jni_ids = ids; }
 824   JNIid* jni_id_for(int offset);
 825 
 826   // maintenance of deoptimization dependencies
 827   inline DependencyContext dependencies();
 828   int  mark_dependent_nmethods(DepChange& changes);
 829   void add_dependent_nmethod(nmethod* nm);
 830   void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
 831 
 832   // On-stack replacement support
 833   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
 834   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
 835   void add_osr_nmethod(nmethod* n);
 836   void remove_osr_nmethod(nmethod* n);
 837   int mark_osr_nmethods(const Method* m);
 838   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
 839 
 840   // Breakpoint support (see methods on Method* for details)
 841   BreakpointInfo* breakpoints() const       { return _breakpoints; };
 842   void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
 843 
 844   // support for stub routines
 845   static ByteSize init_state_offset()  { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
 846   TRACE_DEFINE_OFFSET;
 847   static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
 848 
 849   // subclass/subinterface checks
 850   bool implements_interface(Klass* k) const;
 851   bool is_same_or_direct_interface(Klass* k) const;
 852 
 853 #ifdef ASSERT
 854   // check whether this class or one of its superclasses was redefined
 855   bool has_redefined_this_or_super() const;
 856 #endif
 857 
 858   // Access to the implementor of an interface.
 859   Klass* implementor() const
 860   {
 861     Klass** k = adr_implementor();
 862     if (k == NULL) {
 863       return NULL;
 864     } else {
 865       return *k;
 866     }
 867   }
 868 
 869   void set_implementor(Klass* k) {
 870     assert(is_interface(), "not interface");
 871     Klass** addr = adr_implementor();
 872     assert(addr != NULL, "null addr");
 873     if (addr != NULL) {
 874       *addr = k;
 875     }
 876   }
 877 
 878   int  nof_implementors() const       {
 879     Klass* k = implementor();
 880     if (k == NULL) {
 881       return 0;
 882     } else if (k != this) {
 883       return 1;
 884     } else {
 885       return 2;
 886     }
 887   }
 888 
 889   void add_implementor(Klass* k);  // k is a new class that implements this interface
 890   void init_implementor();           // initialize
 891 
 892   // link this class into the implementors list of every interface it implements
 893   void process_interfaces(Thread *thread);
 894 
 895   // virtual operations from Klass
 896   bool is_leaf_class() const               { return _subklass == NULL; }
 897   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
 898   bool compute_is_subtype_of(Klass* k);
 899   bool can_be_primary_super_slow() const;
 900   int oop_size(oop obj)  const             { return size_helper(); }
 901   // slow because it's a virtual call and used for verifying the layout_helper.
 902   // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
 903   DEBUG_ONLY(bool is_instance_klass_slow() const      { return true; })
 904 
 905   // Iterators
 906   void do_local_static_fields(FieldClosure* cl);
 907   void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
 908   void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
 909 
 910   void methods_do(void f(Method* method));
 911   void array_klasses_do(void f(Klass* k));
 912   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
 913   bool super_types_do(SuperTypeClosure* blk);
 914 
 915   static InstanceKlass* cast(Klass* k) {
 916     return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
 917   }
 918 
 919   static const InstanceKlass* cast(const Klass* k) {
 920     assert(k != NULL, "k should not be null");
 921     assert(k->is_instance_klass(), "cast to InstanceKlass");
 922     return static_cast<const InstanceKlass*>(k);
 923   }
 924 
 925   InstanceKlass* java_super() const {
 926     return (super() == NULL) ? NULL : cast(super());
 927   }
 928 
 929   // Sizing (in words)
 930   static int header_size()            { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
 931 
 932   static int size(int vtable_length, int itable_length,
 933                   int nonstatic_oop_map_size,
 934                   bool is_interface, bool is_anonymous) {
 935     return align_object_size(header_size() +
 936            align_object_offset(vtable_length) +
 937            align_object_offset(itable_length) +
 938            ((is_interface || is_anonymous) ?
 939              align_object_offset(nonstatic_oop_map_size) :
 940              nonstatic_oop_map_size) +
 941            (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
 942            (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
 943   }
 944   int size() const                    { return size(vtable_length(),
 945                                                itable_length(),
 946                                                nonstatic_oop_map_size(),
 947                                                is_interface(),
 948                                                is_anonymous());
 949   }
 950 #if INCLUDE_SERVICES
 951   virtual void collect_statistics(KlassSizeStats *sz) const;
 952 #endif
 953 
 954   static int vtable_start_offset()    { return header_size(); }
 955   static int vtable_length_offset()   { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
 956 
 957   intptr_t* start_of_vtable() const        { return ((intptr_t*)this) + vtable_start_offset(); }
 958   intptr_t* start_of_itable() const        { return start_of_vtable() + align_object_offset(vtable_length()); }
 959   int  itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
 960 
 961   intptr_t* end_of_itable() const          { return start_of_itable() + itable_length(); }
 962 
 963   address static_field_addr(int offset);
 964 
 965   OopMapBlock* start_of_nonstatic_oop_maps() const {
 966     return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
 967   }
 968 
 969   Klass** end_of_nonstatic_oop_maps() const {
 970     return (Klass**)(start_of_nonstatic_oop_maps() +
 971                      nonstatic_oop_map_count());
 972   }
 973 
 974   Klass** adr_implementor() const {
 975     if (is_interface()) {
 976       return (Klass**)end_of_nonstatic_oop_maps();
 977     } else {
 978       return NULL;
 979     }
 980   };
 981 
 982   Klass** adr_host_klass() const {
 983     if (is_anonymous()) {
 984       Klass** adr_impl = adr_implementor();
 985       if (adr_impl != NULL) {
 986         return adr_impl + 1;
 987       } else {
 988         return end_of_nonstatic_oop_maps();
 989       }
 990     } else {
 991       return NULL;
 992     }
 993   }
 994 
 995   // Use this to return the size of an instance in heap words:
 996   int size_helper() const {
 997     return layout_helper_to_size_helper(layout_helper());
 998   }
 999 
1000   // This bit is initialized in classFileParser.cpp.
1001   // It is false under any of the following conditions:
1002   //  - the class is abstract (including any interface)
1003   //  - the class has a finalizer (if !RegisterFinalizersAtInit)
1004   //  - the class size is larger than FastAllocateSizeLimit
1005   //  - the class is java/lang/Class, which cannot be allocated directly
1006   bool can_be_fastpath_allocated() const {
1007     return !layout_helper_needs_slow_path(layout_helper());
1008   }
1009 
1010   // Java vtable/itable
1011   klassVtable* vtable() const;        // return new klassVtable wrapper
1012   inline Method* method_at_vtable(int index);
1013   klassItable* itable() const;        // return new klassItable wrapper
1014   Method* method_at_itable(Klass* holder, int index, TRAPS);
1015 
1016 #if INCLUDE_JVMTI
1017   void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1018 #endif // INCLUDE_JVMTI
1019 
1020   void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1021   void clean_implementors_list(BoolObjectClosure* is_alive);
1022   void clean_method_data(BoolObjectClosure* is_alive);
1023 
1024   // Explicit metaspace deallocation of fields
1025   // For RedefineClasses and class file parsing errors, we need to deallocate
1026   // instanceKlasses and the metadata they point to.
1027   void deallocate_contents(ClassLoaderData* loader_data);
1028   static void deallocate_methods(ClassLoaderData* loader_data,
1029                                  Array<Method*>* methods);
1030   void static deallocate_interfaces(ClassLoaderData* loader_data,
1031                                     const Klass* super_klass,
1032                                     Array<Klass*>* local_interfaces,
1033                                     Array<Klass*>* transitive_interfaces);
1034 
1035   // The constant pool is on stack if any of the methods are executing or
1036   // referenced by handles.
1037   bool on_stack() const { return _constants->on_stack(); }
1038 
1039   // callbacks for actions during class unloading
1040   static void notify_unload_class(InstanceKlass* ik);
1041   static void release_C_heap_structures(InstanceKlass* ik);
1042 
1043   // Naming
1044   const char* signature_name() const;
1045 
1046   // GC specific object visitors
1047   //
1048   // Mark Sweep
1049   int  oop_ms_adjust_pointers(oop obj);
1050 #if INCLUDE_ALL_GCS
1051   // Parallel Scavenge
1052   void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);
1053   // Parallel Compact
1054   void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1055   void oop_pc_update_pointers(oop obj);
1056 #endif
1057 
1058   // Oop fields (and metadata) iterators
1059   //  [nv = true]  Use non-virtual calls to do_oop_nv.
1060   //  [nv = false] Use virtual calls to do_oop.
1061   //
1062   // The InstanceKlass iterators also visits the Object's klass.
1063 
1064   // Forward iteration
1065  public:
1066   // Iterate over all oop fields in the oop maps.
1067   template <bool nv, class OopClosureType>
1068   inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1069 
1070  protected:
1071   // Iterate over all oop fields and metadata.
1072   template <bool nv, class OopClosureType>
1073   inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1074 
1075  private:
1076   // Iterate over all oop fields in the oop maps.
1077   // Specialized for [T = oop] or [T = narrowOop].
1078   template <bool nv, typename T, class OopClosureType>
1079   inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1080 
1081   // Iterate over all oop fields in one oop map.
1082   template <bool nv, typename T, class OopClosureType>
1083   inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1084 
1085 
1086   // Reverse iteration
1087 #if INCLUDE_ALL_GCS
1088  public:
1089   // Iterate over all oop fields in the oop maps.
1090   template <bool nv, class OopClosureType>
1091   inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1092 
1093  protected:
1094   // Iterate over all oop fields and metadata.
1095   template <bool nv, class OopClosureType>
1096   inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1097 
1098  private:
1099   // Iterate over all oop fields in the oop maps.
1100   // Specialized for [T = oop] or [T = narrowOop].
1101   template <bool nv, typename T, class OopClosureType>
1102   inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1103 
1104   // Iterate over all oop fields in one oop map.
1105   template <bool nv, typename T, class OopClosureType>
1106   inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1107 #endif
1108 
1109 
1110   // Bounded range iteration
1111  public:
1112   // Iterate over all oop fields in the oop maps.
1113   template <bool nv, class OopClosureType>
1114   inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1115 
1116  protected:
1117   // Iterate over all oop fields and metadata.
1118   template <bool nv, class OopClosureType>
1119   inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1120 
1121  private:
1122   // Iterate over all oop fields in the oop maps.
1123   // Specialized for [T = oop] or [T = narrowOop].
1124   template <bool nv, typename T, class OopClosureType>
1125   inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1126 
1127   // Iterate over all oop fields in one oop map.
1128   template <bool nv, typename T, class OopClosureType>
1129   inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1130 
1131 
1132  public:
1133 
1134   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1135   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1136 
1137 #if INCLUDE_ALL_GCS
1138   ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1139   ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1140 #endif // INCLUDE_ALL_GCS
1141 
1142   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
1143 
1144 public:
1145   void set_in_error_state() {
1146     assert(DumpSharedSpaces, "only call this when dumping archive");
1147     _init_state = initialization_error;
1148   }
1149   bool check_sharing_error_state();
1150 
1151 private:
1152   // initialization state
1153 #ifdef ASSERT
1154   void set_init_state(ClassState state);
1155 #else
1156   void set_init_state(ClassState state) { _init_state = (u1)state; }
1157 #endif
1158   void set_rewritten()                  { _misc_flags |= _misc_rewritten; }
1159   void set_init_thread(Thread *thread)  { _init_thread = thread; }
1160 
1161   // The RedefineClasses() API can cause new method idnums to be needed
1162   // which will cause the caches to grow. Safety requires different
1163   // cache management logic if the caches can grow instead of just
1164   // going from NULL to non-NULL.
1165   bool idnum_can_increment() const      { return has_been_redefined(); }
1166   jmethodID* methods_jmethod_ids_acquire() const
1167          { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1168   void release_set_methods_jmethod_ids(jmethodID* jmeths)
1169          { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1170 
1171   // Lock during initialization
1172 public:
1173   // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1174   // Must be one per class and it has to be a VM internal object so java code
1175   // cannot lock it (like the mirror).
1176   // It has to be an object not a Mutex because it's held through java calls.
1177   oop init_lock() const;
1178 private:
1179   void fence_and_clear_init_lock();
1180 
1181   // Static methods that are used to implement member methods where an exposed this pointer
1182   // is needed due to possible GCs
1183   static bool link_class_impl                           (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1184   static bool verify_code                               (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1185   static void initialize_impl                           (instanceKlassHandle this_k, TRAPS);
1186   static void initialize_super_interfaces               (instanceKlassHandle this_k, TRAPS);
1187   static void eager_initialize_impl                     (instanceKlassHandle this_k);
1188   static void set_initialization_state_and_notify_impl  (instanceKlassHandle this_k, ClassState state, TRAPS);
1189   static void call_class_initializer_impl               (instanceKlassHandle this_k, TRAPS);
1190   static Klass* array_klass_impl                        (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1191   static void do_local_static_fields_impl               (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1192   /* jni_id_for_impl for jfieldID only */
1193   static JNIid* jni_id_for_impl                         (instanceKlassHandle this_k, int offset);
1194 
1195   // Returns the array class for the n'th dimension
1196   Klass* array_klass_impl(bool or_null, int n, TRAPS);
1197 
1198   // Returns the array class with this class as element type
1199   Klass* array_klass_impl(bool or_null, TRAPS);
1200 
1201   // find a local method (returns NULL if not found)
1202   Method* find_method_impl(const Symbol* name,
1203                            const Symbol* signature,
1204                            OverpassLookupMode overpass_mode,
1205                            StaticLookupMode static_mode,
1206                            PrivateLookupMode private_mode) const;
1207 
1208   static Method* find_method_impl(const Array<Method*>* methods,
1209                                   const Symbol* name,
1210                                   const Symbol* signature,
1211                                   OverpassLookupMode overpass_mode,
1212                                   StaticLookupMode static_mode,
1213                                   PrivateLookupMode private_mode);
1214 
1215   // Free CHeap allocated fields.
1216   void release_C_heap_structures();
1217 
1218   // RedefineClasses support
1219   void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1220   void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1221 public:
1222   // CDS support - remove and restore oops from metadata. Oops are not shared.
1223   virtual void remove_unshareable_info();
1224   virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1225 
1226   // jvm support
1227   jint compute_modifier_flags(TRAPS) const;
1228 
1229   // JSR-292 support
1230   MemberNameTable* member_names() { return _member_names; }
1231   void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1232   bool add_member_name(Handle member_name);
1233 
1234 public:
1235   // JVMTI support
1236   jint jvmti_class_status() const;
1237 
1238  public:
1239   // Printing
1240 #ifndef PRODUCT
1241   void print_on(outputStream* st) const;
1242 #endif
1243   void print_value_on(outputStream* st) const;
1244 
1245   void oop_print_value_on(oop obj, outputStream* st);
1246 
1247 #ifndef PRODUCT
1248   void oop_print_on      (oop obj, outputStream* st);
1249 
1250   void print_dependent_nmethods(bool verbose = false);
1251   bool is_dependent_nmethod(nmethod* nm);
1252 #endif
1253 
1254   const char* internal_name() const;
1255 
1256   // Verification
1257   void verify_on(outputStream* st);
1258 
1259   void oop_verify_on(oop obj, outputStream* st);
1260 };
1261 
1262 inline Method* InstanceKlass::method_at_vtable(int index)  {
1263 #ifndef PRODUCT
1264   assert(index >= 0, "valid vtable index");
1265   if (DebugVtables) {
1266     verify_vtable_index(index);
1267   }
1268 #endif
1269   vtableEntry* ve = (vtableEntry*)start_of_vtable();
1270   return ve[index].method();
1271 }
1272 
1273 // for adding methods
1274 // UNSET_IDNUM return means no more ids available
1275 inline u2 InstanceKlass::next_method_idnum() {
1276   if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1277     return ConstMethod::UNSET_IDNUM; // no more ids available
1278   } else {
1279     return _idnum_allocated_count++;
1280   }
1281 }
1282 
1283 
1284 /* JNIid class for jfieldIDs only */
1285 class JNIid: public CHeapObj<mtClass> {
1286   friend class VMStructs;
1287  private:
1288   Klass*             _holder;
1289   JNIid*             _next;
1290   int                _offset;
1291 #ifdef ASSERT
1292   bool               _is_static_field_id;
1293 #endif
1294 
1295  public:
1296   // Accessors
1297   Klass* holder() const           { return _holder; }
1298   int offset() const              { return _offset; }
1299   JNIid* next()                   { return _next; }
1300   // Constructor
1301   JNIid(Klass* holder, int offset, JNIid* next);
1302   // Identifier lookup
1303   JNIid* find(int offset);
1304 
1305   bool find_local_field(fieldDescriptor* fd) {
1306     return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1307   }
1308 
1309   static void deallocate(JNIid* id);
1310   // Debugging
1311 #ifdef ASSERT
1312   bool is_static_field_id() const { return _is_static_field_id; }
1313   void set_is_static_field_id()   { _is_static_field_id = true; }
1314 #endif
1315   void verify(Klass* holder);
1316 };
1317 
1318 // An iterator that's used to access the inner classes indices in the
1319 // InstanceKlass::_inner_classes array.
1320 class InnerClassesIterator : public StackObj {
1321  private:
1322   Array<jushort>* _inner_classes;
1323   int _length;
1324   int _idx;
1325  public:
1326 
1327   InnerClassesIterator(instanceKlassHandle k) {
1328     _inner_classes = k->inner_classes();
1329     if (k->inner_classes() != NULL) {
1330       _length = _inner_classes->length();
1331       // The inner class array's length should be the multiple of
1332       // inner_class_next_offset if it only contains the InnerClasses
1333       // attribute data, or it should be
1334       // n*inner_class_next_offset+enclosing_method_attribute_size
1335       // if it also contains the EnclosingMethod data.
1336       assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1337               _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1338              "just checking");
1339       // Remove the enclosing_method portion if exists.
1340       if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1341         _length -= InstanceKlass::enclosing_method_attribute_size;
1342       }
1343     } else {
1344       _length = 0;
1345     }
1346     _idx = 0;
1347   }
1348 
1349   int length() const {
1350     return _length;
1351   }
1352 
1353   void next() {
1354     _idx += InstanceKlass::inner_class_next_offset;
1355   }
1356 
1357   bool done() const {
1358     return (_idx >= _length);
1359   }
1360 
1361   u2 inner_class_info_index() const {
1362     return _inner_classes->at(
1363                _idx + InstanceKlass::inner_class_inner_class_info_offset);
1364   }
1365 
1366   void set_inner_class_info_index(u2 index) {
1367     _inner_classes->at_put(
1368                _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1369   }
1370 
1371   u2 outer_class_info_index() const {
1372     return _inner_classes->at(
1373                _idx + InstanceKlass::inner_class_outer_class_info_offset);
1374   }
1375 
1376   void set_outer_class_info_index(u2 index) {
1377     _inner_classes->at_put(
1378                _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1379   }
1380 
1381   u2 inner_name_index() const {
1382     return _inner_classes->at(
1383                _idx + InstanceKlass::inner_class_inner_name_offset);
1384   }
1385 
1386   void set_inner_name_index(u2 index) {
1387     _inner_classes->at_put(
1388                _idx + InstanceKlass::inner_class_inner_name_offset, index);
1389   }
1390 
1391   u2 inner_access_flags() const {
1392     return _inner_classes->at(
1393                _idx + InstanceKlass::inner_class_access_flags_offset);
1394   }
1395 };
1396 
1397 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP