1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_OOPS_INSTANCEKLASS_HPP
  26 #define SHARE_OOPS_INSTANCEKLASS_HPP
  27 
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.hpp"
  30 #include "classfile/moduleEntry.hpp"
  31 #include "classfile/packageEntry.hpp"
  32 #include "memory/referenceType.hpp"
  33 #include "oops/annotations.hpp"
  34 #include "oops/constMethod.hpp"
  35 #include "oops/fieldInfo.hpp"
  36 #include "oops/instanceOop.hpp"
  37 #include "oops/klassVtable.hpp"
  38 #include "oops/recordParamInfo.hpp"
  39 #include "runtime/handles.hpp"
  40 #include "runtime/os.hpp"
  41 #include "utilities/accessFlags.hpp"
  42 #include "utilities/align.hpp"
  43 #include "utilities/macros.hpp"
  44 #if INCLUDE_JFR
  45 #include "jfr/support/jfrKlassExtension.hpp"
  46 #endif
  47 
  48 
  49 // An InstanceKlass is the VM level representation of a Java class.
  50 // It contains all information needed for at class at execution runtime.
  51 
  52 //  InstanceKlass embedded field layout (after declared fields):
  53 //    [EMBEDDED Java vtable             ] size in words = vtable_len
  54 //    [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
  55 //      The embedded nonstatic oop-map blocks are short pairs (offset, length)
  56 //      indicating where oops are located in instances of this klass.
  57 //    [EMBEDDED implementor of the interface] only exist for interface
  58 //    [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
  59 //    [EMBEDDED fingerprint       ] only if should_store_fingerprint()==true
  60 
  61 
  62 // forward declaration for class -- see below for definition
  63 #if INCLUDE_JVMTI
  64 class BreakpointInfo;
  65 #endif
  66 class ClassFileParser;
  67 class KlassDepChange;
  68 class DependencyContext;
  69 class fieldDescriptor;
  70 class jniIdMapBase;
  71 class JNIid;
  72 class JvmtiCachedClassFieldMap;
  73 class nmethodBucket;
  74 class SuperTypeClosure;
  75 class OopMapCache;
  76 class InterpreterOopMap;
  77 
  78 // This is used in iterators below.
  79 class FieldClosure: public StackObj {
  80 public:
  81   virtual void do_field(fieldDescriptor* fd) = 0;
  82 };
  83 
  84 #ifndef PRODUCT
  85 // Print fields.
  86 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
  87 class FieldPrinter: public FieldClosure {
  88    oop _obj;
  89    outputStream* _st;
  90  public:
  91    FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
  92    void do_field(fieldDescriptor* fd);
  93 };
  94 #endif  // !PRODUCT
  95 
  96 // Describes where oops are located in instances of this klass.
  97 class OopMapBlock {
  98  public:
  99   // Byte offset of the first oop mapped by this block.
 100   int offset() const          { return _offset; }
 101   void set_offset(int offset) { _offset = offset; }
 102 
 103   // Number of oops in this block.
 104   uint count() const         { return _count; }
 105   void set_count(uint count) { _count = count; }
 106 
 107   // sizeof(OopMapBlock) in words.
 108   static const int size_in_words() {
 109     return align_up((int)sizeof(OopMapBlock), wordSize) >>
 110       LogBytesPerWord;
 111   }
 112 
 113  private:
 114   int  _offset;
 115   uint _count;
 116 };
 117 
 118 struct JvmtiCachedClassFileData;
 119 
 120 class InstanceKlass: public Klass {
 121   friend class VMStructs;
 122   friend class JVMCIVMStructs;
 123   friend class ClassFileParser;
 124   friend class CompileReplay;
 125 
 126  public:
 127   static const KlassID ID = InstanceKlassID;
 128 
 129  protected:
 130   InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
 131 
 132  public:
 133   InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
 134 
 135   // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
 136   // of the class loading & initialization procedure, and the use of the states.
 137   enum ClassState {
 138     allocated,                          // allocated (but not yet linked)
 139     loaded,                             // loaded and inserted in class hierarchy (but not linked yet)
 140     linked,                             // successfully linked/verified (but not initialized yet)
 141     being_initialized,                  // currently running class initializer
 142     fully_initialized,                  // initialized (successfull final state)
 143     initialization_error                // error happened during initialization
 144   };
 145 
 146  private:
 147   static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
 148 
 149  protected:
 150   // If you add a new field that points to any metaspace object, you
 151   // must add this field to InstanceKlass::metaspace_pointers_do().
 152 
 153   // Annotations for this class
 154   Annotations*    _annotations;
 155   // Package this class is defined in
 156   PackageEntry*   _package_entry;
 157   // Array classes holding elements of this class.
 158   Klass* volatile _array_klasses;
 159   // Constant pool for this class.
 160   ConstantPool* _constants;
 161   // The InnerClasses attribute and EnclosingMethod attribute. The
 162   // _inner_classes is an array of shorts. If the class has InnerClasses
 163   // attribute, then the _inner_classes array begins with 4-tuples of shorts
 164   // [inner_class_info_index, outer_class_info_index,
 165   // inner_name_index, inner_class_access_flags] for the InnerClasses
 166   // attribute. If the EnclosingMethod attribute exists, it occupies the
 167   // last two shorts [class_index, method_index] of the array. If only
 168   // the InnerClasses attribute exists, the _inner_classes array length is
 169   // number_of_inner_classes * 4. If the class has both InnerClasses
 170   // and EnclosingMethod attributes the _inner_classes array length is
 171   // number_of_inner_classes * 4 + enclosing_method_attribute_size.
 172   Array<jushort>* _inner_classes;
 173 
 174   // The NestMembers attribute. An array of shorts, where each is a
 175   // class info index for the class that is a nest member. This data
 176   // has not been validated.
 177   Array<jushort>* _nest_members;
 178 
 179   // The NestHost attribute. The class info index for the class
 180   // that is the nest-host of this class. This data has not been validated.
 181   jushort _nest_host_index;
 182 
 183   // Resolved nest-host klass: either true nest-host or self if we are not nested.
 184   // By always being set it makes nest-member access checks simpler.
 185   InstanceKlass* _nest_host;
 186 
 187   // the source debug extension for this klass, NULL if not specified.
 188   // Specified as UTF-8 string without terminating zero byte in the classfile,
 189   // it is stored in the instanceklass as a NULL-terminated UTF-8 string
 190   const char*     _source_debug_extension;
 191   // Array name derived from this class which needs unreferencing
 192   // if this class is unloaded.
 193   Symbol*         _array_name;
 194 
 195   Array<u2>*      _record_params;
 196 
 197   // Number of heapOopSize words used by non-static fields in this klass
 198   // (including inherited fields but after header_size()).
 199   int             _nonstatic_field_size;
 200   int             _static_field_size;    // number words used by static fields (oop and non-oop) in this klass
 201   // Constant pool index to the utf8 entry of the Generic signature,
 202   // or 0 if none.
 203   u2              _generic_signature_index;
 204   // Constant pool index to the utf8 entry for the name of source file
 205   // containing this klass, 0 if not specified.
 206   u2              _source_file_name_index;
 207   u2              _static_oop_field_count;// number of static oop fields in this klass
 208   u2              _java_fields_count;    // The number of declared Java fields
 209   u2              _record_params_count;  // The number of record parameters
 210   int             _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
 211 
 212   int             _itable_len;           // length of Java itable (in words)
 213   // _is_marked_dependent can be set concurrently, thus cannot be part of the
 214   // _misc_flags.
 215   bool            _is_marked_dependent;  // used for marking during flushing and deoptimization
 216   bool            _is_being_redefined;   // used for locking redefinition
 217 
 218   // The low two bits of _misc_flags contains the kind field.
 219   // This can be used to quickly discriminate among the four kinds of
 220   // InstanceKlass.
 221 
 222   static const unsigned _misc_kind_field_size = 2;
 223   static const unsigned _misc_kind_field_pos  = 0;
 224   static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
 225 
 226   static const unsigned _misc_kind_other        = 0; // concrete InstanceKlass
 227   static const unsigned _misc_kind_reference    = 1; // InstanceRefKlass
 228   static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
 229   static const unsigned _misc_kind_mirror       = 3; // InstanceMirrorKlass
 230 
 231   // Start after _misc_kind field.
 232   enum {
 233     _misc_rewritten                           = 1 << 2,  // methods rewritten.
 234     _misc_has_nonstatic_fields                = 1 << 3,  // for sizing with UseCompressedOops
 235     _misc_should_verify_class                 = 1 << 4,  // allow caching of preverification
 236     _misc_is_unsafe_anonymous                 = 1 << 5,  // has embedded _unsafe_anonymous_host field
 237     _misc_is_contended                        = 1 << 6,  // marked with contended annotation
 238     _misc_has_nonstatic_concrete_methods      = 1 << 7,  // class/superclass/implemented interfaces has non-static, concrete methods
 239     _misc_declares_nonstatic_concrete_methods = 1 << 8,  // directly declares non-static, concrete methods
 240     _misc_has_been_redefined                  = 1 << 9,  // class has been redefined
 241     _misc_has_passed_fingerprint_check        = 1 << 10, // when this class was loaded, the fingerprint computed from its
 242                                                          // code source was found to be matching the value recorded by AOT.
 243     _misc_is_scratch_class                    = 1 << 11, // class is the redefined scratch class
 244     _misc_is_shared_boot_class                = 1 << 12, // defining class loader is boot class loader
 245     _misc_is_shared_platform_class            = 1 << 13, // defining class loader is platform class loader
 246     _misc_is_shared_app_class                 = 1 << 14, // defining class loader is app class loader
 247     _misc_has_resolved_methods                = 1 << 15  // resolved methods table entries added for this class
 248   };
 249   u2 loader_type_bits() {
 250     return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
 251   }
 252   u2              _misc_flags;
 253   u2              _minor_version;        // minor version number of class file
 254   u2              _major_version;        // major version number of class file
 255   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
 256   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
 257   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
 258   jmethodID*      volatile _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
 259   nmethodBucket*  volatile _dep_context;          // packed DependencyContext structure
 260   uint64_t        volatile _dep_context_last_cleaned;
 261   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
 262 #if INCLUDE_JVMTI
 263   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
 264   // Linked instanceKlasses of previous versions
 265   InstanceKlass* _previous_versions;
 266   // JVMTI fields can be moved to their own structure - see 6315920
 267   // JVMTI: cached class file, before retransformable agent modified it in CFLH
 268   JvmtiCachedClassFileData* _cached_class_file;
 269 #endif
 270 
 271   volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
 272 
 273   // Class states are defined as ClassState (see above).
 274   // Place the _init_state here to utilize the unused 2-byte after
 275   // _idnum_allocated_count.
 276   u1              _init_state;                    // state of class
 277   u1              _reference_type;                // reference type
 278 
 279   u2              _this_class_index;              // constant pool entry
 280 #if INCLUDE_JVMTI
 281   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
 282 #endif
 283 
 284   NOT_PRODUCT(int _verify_count;)  // to avoid redundant verifies
 285 
 286   // Method array.
 287   Array<Method*>* _methods;
 288   // Default Method Array, concrete methods inherited from interfaces
 289   Array<Method*>* _default_methods;
 290   // Interfaces (InstanceKlass*s) this class declares locally to implement.
 291   Array<InstanceKlass*>* _local_interfaces;
 292   // Interfaces (InstanceKlass*s) this class implements transitively.
 293   Array<InstanceKlass*>* _transitive_interfaces;
 294   // Int array containing the original order of method in the class file (for JVMTI).
 295   Array<int>*     _method_ordering;
 296   // Int array containing the vtable_indices for default_methods
 297   // offset matches _default_methods offset
 298   Array<int>*     _default_vtable_indices;
 299 
 300   // Instance and static variable information, starts with 6-tuples of shorts
 301   // [access, name index, sig index, initval index, low_offset, high_offset]
 302   // for all fields, followed by the generic signature data at the end of
 303   // the array. Only fields with generic signature attributes have the generic
 304   // signature data set in the array. The fields array looks like following:
 305   //
 306   // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
 307   // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
 308   //      ...
 309   // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
 310   //     [generic signature index]
 311   //     [generic signature index]
 312   //     ...
 313   Array<u2>*      _fields;
 314 
 315   // embedded Java vtable follows here
 316   // embedded Java itables follows here
 317   // embedded static fields follows here
 318   // embedded nonstatic oop-map blocks follows here
 319   // embedded implementor of this interface follows here
 320   //   The embedded implementor only exists if the current klass is an
 321   //   iterface. The possible values of the implementor fall into following
 322   //   three cases:
 323   //     NULL: no implementor.
 324   //     A Klass* that's not itself: one implementor.
 325   //     Itself: more than one implementors.
 326   // embedded unsafe_anonymous_host klass follows here
 327   //   The embedded host klass only exists in an unsafe anonymous class for
 328   //   dynamic language support (JSR 292 enabled). The host class grants
 329   //   its access privileges to this class also. The host class is either
 330   //   named, or a previously loaded unsafe anonymous class. A non-anonymous class
 331   //   or an anonymous class loaded through normal classloading does not
 332   //   have this embedded field.
 333   //
 334 
 335   friend class SystemDictionary;
 336 
 337  public:
 338   u2 loader_type() {
 339     return _misc_flags & loader_type_bits();
 340   }
 341 
 342   bool is_shared_boot_class() const {
 343     return (_misc_flags & _misc_is_shared_boot_class) != 0;
 344   }
 345   bool is_shared_platform_class() const {
 346     return (_misc_flags & _misc_is_shared_platform_class) != 0;
 347   }
 348   bool is_shared_app_class() const {
 349     return (_misc_flags & _misc_is_shared_app_class) != 0;
 350   }
 351 
 352   void clear_class_loader_type() {
 353     _misc_flags &= ~loader_type_bits();
 354   }
 355 
 356   void set_class_loader_type(s2 loader_type) {
 357     switch (loader_type) {
 358     case ClassLoader::BOOT_LOADER:
 359       _misc_flags |= _misc_is_shared_boot_class;
 360        break;
 361     case ClassLoader::PLATFORM_LOADER:
 362       _misc_flags |= _misc_is_shared_platform_class;
 363       break;
 364     case ClassLoader::APP_LOADER:
 365       _misc_flags |= _misc_is_shared_app_class;
 366       break;
 367     default:
 368       ShouldNotReachHere();
 369       break;
 370     }
 371   }
 372 
 373   bool has_nonstatic_fields() const        {
 374     return (_misc_flags & _misc_has_nonstatic_fields) != 0;
 375   }
 376   void set_has_nonstatic_fields(bool b)    {
 377     if (b) {
 378       _misc_flags |= _misc_has_nonstatic_fields;
 379     } else {
 380       _misc_flags &= ~_misc_has_nonstatic_fields;
 381     }
 382   }
 383 
 384   // field sizes
 385   int nonstatic_field_size() const         { return _nonstatic_field_size; }
 386   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
 387 
 388   int static_field_size() const            { return _static_field_size; }
 389   void set_static_field_size(int size)     { _static_field_size = size; }
 390 
 391   int static_oop_field_count() const       { return (int)_static_oop_field_count; }
 392   void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
 393 
 394   // Java itable
 395   int  itable_length() const               { return _itable_len; }
 396   void set_itable_length(int len)          { _itable_len = len; }
 397 
 398   // array klasses
 399   Klass* array_klasses() const             { return _array_klasses; }
 400   inline Klass* array_klasses_acquire() const; // load with acquire semantics
 401   void set_array_klasses(Klass* k)         { _array_klasses = k; }
 402   inline void release_set_array_klasses(Klass* k); // store with release semantics
 403 
 404   // methods
 405   Array<Method*>* methods() const          { return _methods; }
 406   void set_methods(Array<Method*>* a)      { _methods = a; }
 407   Method* method_with_idnum(int idnum);
 408   Method* method_with_orig_idnum(int idnum);
 409   Method* method_with_orig_idnum(int idnum, int version);
 410 
 411   // method ordering
 412   Array<int>* method_ordering() const     { return _method_ordering; }
 413   void set_method_ordering(Array<int>* m) { _method_ordering = m; }
 414   void copy_method_ordering(const intArray* m, TRAPS);
 415 
 416   // default_methods
 417   Array<Method*>* default_methods() const  { return _default_methods; }
 418   void set_default_methods(Array<Method*>* a) { _default_methods = a; }
 419 
 420   // default method vtable_indices
 421   Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
 422   void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
 423   Array<int>* create_new_default_vtable_indices(int len, TRAPS);
 424 
 425   // interfaces
 426   Array<InstanceKlass*>* local_interfaces() const          { return _local_interfaces; }
 427   void set_local_interfaces(Array<InstanceKlass*>* a)      {
 428     guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
 429     _local_interfaces = a; }
 430 
 431   Array<InstanceKlass*>* transitive_interfaces() const     { return _transitive_interfaces; }
 432   void set_transitive_interfaces(Array<InstanceKlass*>* a) {
 433     guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
 434     _transitive_interfaces = a;
 435   }
 436 
 437  private:
 438   friend class fieldDescriptor;
 439   FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
 440 
 441   RecordParamInfo* record_param(int index) const { return RecordParamInfo::from_record_params_array(_record_params, index); }
 442 
 443  public:
 444   int     field_offset      (int index) const { return field(index)->offset(); }
 445   int     field_access_flags(int index) const { return field(index)->access_flags(); }
 446   Symbol* field_name        (int index) const { return field(index)->name(constants()); }
 447   Symbol* field_signature   (int index) const { return field(index)->signature(constants()); }
 448 
 449   // Number of Java declared fields
 450   int java_fields_count() const           { return (int)_java_fields_count; }
 451 
 452   Array<u2>* fields() const            { return _fields; }
 453   void set_fields(Array<u2>* f, u2 java_fields_count) {
 454     guarantee(_fields == NULL || f == NULL, "Just checking");
 455     _fields = f;
 456     _java_fields_count = java_fields_count;
 457   }
 458 
 459   // inner classes
 460   Array<u2>* inner_classes() const       { return _inner_classes; }
 461   void set_inner_classes(Array<u2>* f)   { _inner_classes = f; }
 462 
 463   // nest members
 464   Array<u2>* nest_members() const     { return _nest_members; }
 465   void set_nest_members(Array<u2>* m) { _nest_members = m; }
 466 
 467   // nest-host index
 468   jushort nest_host_index() const { return _nest_host_index; }
 469   void set_nest_host_index(u2 i)  { _nest_host_index = i; }
 470 
 471   // record parameters
 472   int     record_param_access_flags(int index) const { return record_param(index)->access_flags(); }
 473   Symbol* record_param_name(int index) const { return record_param(index)->name(constants()); }
 474   Symbol* record_param_signature(int index) const { return record_param(index)->signature(constants()); }
 475   Symbol* record_param_descriptor(int index) const { return record_param(index)->signature(constants()); }
 476 
 477   int record_params_count() const       { return (int)_record_params_count; }
 478 
 479   Array<u2>* record_params() const       { return _record_params; }
 480   void set_record_params(Array<u2>* record_params, u2 record_params_count) {
 481     guarantee(_record_params == NULL || record_params == NULL, "Just checking");
 482     _record_params = record_params;
 483     _record_params_count = record_params_count;
 484   }
 485 
 486 private:
 487   // Called to verify that k is a member of this nest - does not look at k's nest-host
 488   bool has_nest_member(InstanceKlass* k, TRAPS) const;
 489 public:
 490   // Returns nest-host class, resolving and validating it if needed
 491   // Returns NULL if an exception occurs during loading, or validation fails
 492   InstanceKlass* nest_host(Symbol* validationException, TRAPS);
 493   // Check if this klass is a nestmate of k - resolves this nest-host and k's
 494   bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
 495 
 496   enum InnerClassAttributeOffset {
 497     // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
 498     inner_class_inner_class_info_offset = 0,
 499     inner_class_outer_class_info_offset = 1,
 500     inner_class_inner_name_offset = 2,
 501     inner_class_access_flags_offset = 3,
 502     inner_class_next_offset = 4
 503   };
 504 
 505   enum EnclosingMethodAttributeOffset {
 506     enclosing_method_class_index_offset = 0,
 507     enclosing_method_method_index_offset = 1,
 508     enclosing_method_attribute_size = 2
 509   };
 510 
 511   // method override check
 512   bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
 513 
 514   // package
 515   PackageEntry* package() const     { return _package_entry; }
 516   ModuleEntry* module() const;
 517   bool in_unnamed_package() const   { return (_package_entry == NULL); }
 518   void set_package(PackageEntry* p) { _package_entry = p; }
 519   void set_package(ClassLoaderData* loader_data, TRAPS);
 520   bool is_same_class_package(const Klass* class2) const;
 521   bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
 522 
 523   // find an enclosing class
 524   InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
 525 
 526   // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
 527   bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
 528 
 529  private:
 530   // Check prohibited package ("java/" only loadable by boot or platform loaders)
 531   static void check_prohibited_package(Symbol* class_name,
 532                                        ClassLoaderData* loader_data,
 533                                        TRAPS);
 534  public:
 535   // initialization state
 536   bool is_loaded() const                   { return _init_state >= loaded; }
 537   bool is_linked() const                   { return _init_state >= linked; }
 538   bool is_initialized() const              { return _init_state == fully_initialized; }
 539   bool is_not_initialized() const          { return _init_state <  being_initialized; }
 540   bool is_being_initialized() const        { return _init_state == being_initialized; }
 541   bool is_in_error_state() const           { return _init_state == initialization_error; }
 542   bool is_reentrant_initialization(Thread *thread)  { return thread == _init_thread; }
 543   ClassState  init_state()                 { return (ClassState)_init_state; }
 544   bool is_rewritten() const                { return (_misc_flags & _misc_rewritten) != 0; }
 545 
 546   // defineClass specified verification
 547   bool should_verify_class() const         {
 548     return (_misc_flags & _misc_should_verify_class) != 0;
 549   }
 550   void set_should_verify_class(bool value) {
 551     if (value) {
 552       _misc_flags |= _misc_should_verify_class;
 553     } else {
 554       _misc_flags &= ~_misc_should_verify_class;
 555     }
 556   }
 557 
 558   // marking
 559   bool is_marked_dependent() const         { return _is_marked_dependent; }
 560   void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
 561 
 562   // initialization (virtuals from Klass)
 563   bool should_be_initialized() const;  // means that initialize should be called
 564   void initialize(TRAPS);
 565   void link_class(TRAPS);
 566   bool link_class_or_fail(TRAPS); // returns false on failure
 567   void rewrite_class(TRAPS);
 568   void link_methods(TRAPS);
 569   Method* class_initializer() const;
 570 
 571   // set the class to initialized if no static initializer is present
 572   void eager_initialize(Thread *thread);
 573 
 574   // reference type
 575   ReferenceType reference_type() const     { return (ReferenceType)_reference_type; }
 576   void set_reference_type(ReferenceType t) {
 577     assert(t == (u1)t, "overflow");
 578     _reference_type = (u1)t;
 579   }
 580 
 581   // this class cp index
 582   u2 this_class_index() const             { return _this_class_index; }
 583   void set_this_class_index(u2 index)     { _this_class_index = index; }
 584 
 585   static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
 586 
 587   // find local field, returns true if found
 588   bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 589   // find field in direct superinterfaces, returns the interface in which the field is defined
 590   Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 591   // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 592   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 593   // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
 594   Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
 595 
 596   // find a non-static or static field given its offset within the class.
 597   bool contains_field_offset(int offset) {
 598     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 599   }
 600 
 601   bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 602   bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
 603 
 604   // find a local method (returns NULL if not found)
 605   Method* find_method(const Symbol* name, const Symbol* signature) const;
 606   static Method* find_method(const Array<Method*>* methods,
 607                              const Symbol* name,
 608                              const Symbol* signature);
 609 
 610   // find a local method, but skip static methods
 611   Method* find_instance_method(const Symbol* name, const Symbol* signature,
 612                                PrivateLookupMode private_mode = find_private) const;
 613   static Method* find_instance_method(const Array<Method*>* methods,
 614                                       const Symbol* name,
 615                                       const Symbol* signature,
 616                                       PrivateLookupMode private_mode = find_private);
 617 
 618   // find a local method (returns NULL if not found)
 619   Method* find_local_method(const Symbol* name,
 620                             const Symbol* signature,
 621                             OverpassLookupMode overpass_mode,
 622                             StaticLookupMode static_mode,
 623                             PrivateLookupMode private_mode) const;
 624 
 625   // find a local method from given methods array (returns NULL if not found)
 626   static Method* find_local_method(const Array<Method*>* methods,
 627                                    const Symbol* name,
 628                                    const Symbol* signature,
 629                                    OverpassLookupMode overpass_mode,
 630                                    StaticLookupMode static_mode,
 631                                    PrivateLookupMode private_mode);
 632 
 633   // find a local method index in methods or default_methods (returns -1 if not found)
 634   static int find_method_index(const Array<Method*>* methods,
 635                                const Symbol* name,
 636                                const Symbol* signature,
 637                                OverpassLookupMode overpass_mode,
 638                                StaticLookupMode static_mode,
 639                                PrivateLookupMode private_mode);
 640 
 641   // lookup operation (returns NULL if not found)
 642   Method* uncached_lookup_method(const Symbol* name,
 643                                  const Symbol* signature,
 644                                  OverpassLookupMode overpass_mode,
 645                                  PrivateLookupMode private_mode = find_private) const;
 646 
 647   // lookup a method in all the interfaces that this class implements
 648   // (returns NULL if not found)
 649   Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
 650 
 651   // lookup a method in local defaults then in all interfaces
 652   // (returns NULL if not found)
 653   Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
 654 
 655   // Find method indices by name.  If a method with the specified name is
 656   // found the index to the first method is returned, and 'end' is filled in
 657   // with the index of first non-name-matching method.  If no method is found
 658   // -1 is returned.
 659   int find_method_by_name(const Symbol* name, int* end) const;
 660   static int find_method_by_name(const Array<Method*>* methods,
 661                                  const Symbol* name, int* end);
 662 
 663   // constant pool
 664   ConstantPool* constants() const        { return _constants; }
 665   void set_constants(ConstantPool* c)    { _constants = c; }
 666 
 667   // protection domain
 668   oop protection_domain() const;
 669 
 670   // signers
 671   objArrayOop signers() const;
 672 
 673   // host class
 674   InstanceKlass* unsafe_anonymous_host() const {
 675     InstanceKlass** hk = adr_unsafe_anonymous_host();
 676     if (hk == NULL) {
 677       assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
 678       return NULL;
 679     } else {
 680       assert(*hk != NULL, "host klass should always be set if the address is not null");
 681       assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
 682       return *hk;
 683     }
 684   }
 685   void set_unsafe_anonymous_host(const InstanceKlass* host) {
 686     assert(is_unsafe_anonymous(), "not unsafe anonymous");
 687     const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
 688     assert(addr != NULL, "no reversed space");
 689     if (addr != NULL) {
 690       *addr = host;
 691     }
 692   }
 693   bool is_unsafe_anonymous() const                {
 694     return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
 695   }
 696   void set_is_unsafe_anonymous(bool value)        {
 697     if (value) {
 698       _misc_flags |= _misc_is_unsafe_anonymous;
 699     } else {
 700       _misc_flags &= ~_misc_is_unsafe_anonymous;
 701     }
 702   }
 703 
 704   bool is_contended() const                {
 705     return (_misc_flags & _misc_is_contended) != 0;
 706   }
 707   void set_is_contended(bool value)        {
 708     if (value) {
 709       _misc_flags |= _misc_is_contended;
 710     } else {
 711       _misc_flags &= ~_misc_is_contended;
 712     }
 713   }
 714 
 715   // source file name
 716   Symbol* source_file_name() const               {
 717     return (_source_file_name_index == 0) ?
 718       (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
 719   }
 720   u2 source_file_name_index() const              {
 721     return _source_file_name_index;
 722   }
 723   void set_source_file_name_index(u2 sourcefile_index) {
 724     _source_file_name_index = sourcefile_index;
 725   }
 726 
 727   // minor and major version numbers of class file
 728   u2 minor_version() const                 { return _minor_version; }
 729   void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
 730   u2 major_version() const                 { return _major_version; }
 731   void set_major_version(u2 major_version) { _major_version = major_version; }
 732 
 733   // source debug extension
 734   const char* source_debug_extension() const { return _source_debug_extension; }
 735   void set_source_debug_extension(const char* array, int length);
 736 
 737   // symbol unloading support (refcount already added)
 738   Symbol* array_name()                     { return _array_name; }
 739   void set_array_name(Symbol* name)        { assert(_array_name == NULL  || name == NULL, "name already created"); _array_name = name; }
 740 
 741   // nonstatic oop-map blocks
 742   static int nonstatic_oop_map_size(unsigned int oop_map_count) {
 743     return oop_map_count * OopMapBlock::size_in_words();
 744   }
 745   unsigned int nonstatic_oop_map_count() const {
 746     return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
 747   }
 748   int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
 749   void set_nonstatic_oop_map_size(int words) {
 750     _nonstatic_oop_map_size = words;
 751   }
 752 
 753 #if INCLUDE_JVMTI
 754   // Redefinition locking.  Class can only be redefined by one thread at a time.
 755   bool is_being_redefined() const          { return _is_being_redefined; }
 756   void set_is_being_redefined(bool value)  { _is_being_redefined = value; }
 757 
 758   // RedefineClasses() support for previous versions:
 759   void add_previous_version(InstanceKlass* ik, int emcp_method_count);
 760   void purge_previous_version_list();
 761 
 762   InstanceKlass* previous_versions() const { return _previous_versions; }
 763 #else
 764   InstanceKlass* previous_versions() const { return NULL; }
 765 #endif
 766 
 767   InstanceKlass* get_klass_version(int version) {
 768     for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
 769       if (ik->constants()->version() == version) {
 770         return ik;
 771       }
 772     }
 773     return NULL;
 774   }
 775 
 776   bool has_been_redefined() const {
 777     return (_misc_flags & _misc_has_been_redefined) != 0;
 778   }
 779   void set_has_been_redefined() {
 780     _misc_flags |= _misc_has_been_redefined;
 781   }
 782 
 783   bool has_passed_fingerprint_check() const {
 784     return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
 785   }
 786   void set_has_passed_fingerprint_check(bool b) {
 787     if (b) {
 788       _misc_flags |= _misc_has_passed_fingerprint_check;
 789     } else {
 790       _misc_flags &= ~_misc_has_passed_fingerprint_check;
 791     }
 792   }
 793   bool supers_have_passed_fingerprint_checks();
 794 
 795   static bool should_store_fingerprint(bool is_unsafe_anonymous);
 796   bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
 797   bool has_stored_fingerprint() const;
 798   uint64_t get_stored_fingerprint() const;
 799   void store_fingerprint(uint64_t fingerprint);
 800 
 801   bool is_scratch_class() const {
 802     return (_misc_flags & _misc_is_scratch_class) != 0;
 803   }
 804 
 805   void set_is_scratch_class() {
 806     _misc_flags |= _misc_is_scratch_class;
 807   }
 808 
 809   bool has_resolved_methods() const {
 810     return (_misc_flags & _misc_has_resolved_methods) != 0;
 811   }
 812 
 813   void set_has_resolved_methods() {
 814     _misc_flags |= _misc_has_resolved_methods;
 815   }
 816 private:
 817 
 818   void set_kind(unsigned kind) {
 819     assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
 820     unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
 821     unsigned flags = _misc_flags & ~fmask;
 822     _misc_flags = (flags | (kind << _misc_kind_field_pos));
 823   }
 824 
 825   bool is_kind(unsigned desired) const {
 826     unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
 827     return kind == desired;
 828   }
 829 
 830 public:
 831 
 832   // Other is anything that is not one of the more specialized kinds of InstanceKlass.
 833   bool is_other_instance_klass() const        { return is_kind(_misc_kind_other); }
 834   bool is_reference_instance_klass() const    { return is_kind(_misc_kind_reference); }
 835   bool is_mirror_instance_klass() const       { return is_kind(_misc_kind_mirror); }
 836   bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
 837 
 838 #if INCLUDE_JVMTI
 839 
 840   void init_previous_versions() {
 841     _previous_versions = NULL;
 842   }
 843 
 844  private:
 845   static bool  _has_previous_versions;
 846  public:
 847   static void purge_previous_versions(InstanceKlass* ik) {
 848     if (ik->has_been_redefined()) {
 849       ik->purge_previous_version_list();
 850     }
 851   }
 852 
 853   static bool has_previous_versions_and_reset();
 854   static bool has_previous_versions() { return _has_previous_versions; }
 855 
 856   // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
 857   void set_cached_class_file(JvmtiCachedClassFileData *data) {
 858     _cached_class_file = data;
 859   }
 860   JvmtiCachedClassFileData * get_cached_class_file();
 861   jint get_cached_class_file_len();
 862   unsigned char * get_cached_class_file_bytes();
 863 
 864   // JVMTI: Support for caching of field indices, types, and offsets
 865   void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
 866     _jvmti_cached_class_field_map = descriptor;
 867   }
 868   JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
 869     return _jvmti_cached_class_field_map;
 870   }
 871 #else // INCLUDE_JVMTI
 872 
 873   static void purge_previous_versions(InstanceKlass* ik) { return; };
 874   static bool has_previous_versions_and_reset() { return false; }
 875 
 876   void set_cached_class_file(JvmtiCachedClassFileData *data) {
 877     assert(data == NULL, "unexpected call with JVMTI disabled");
 878   }
 879   JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
 880 
 881 #endif // INCLUDE_JVMTI
 882 
 883   bool has_nonstatic_concrete_methods() const {
 884     return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
 885   }
 886   void set_has_nonstatic_concrete_methods(bool b) {
 887     if (b) {
 888       _misc_flags |= _misc_has_nonstatic_concrete_methods;
 889     } else {
 890       _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
 891     }
 892   }
 893 
 894   bool declares_nonstatic_concrete_methods() const {
 895     return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
 896   }
 897   void set_declares_nonstatic_concrete_methods(bool b) {
 898     if (b) {
 899       _misc_flags |= _misc_declares_nonstatic_concrete_methods;
 900     } else {
 901       _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
 902     }
 903   }
 904 
 905   // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
 906   inline u2 next_method_idnum();
 907   void set_initial_method_idnum(u2 value)             { _idnum_allocated_count = value; }
 908 
 909   // generics support
 910   Symbol* generic_signature() const                   {
 911     return (_generic_signature_index == 0) ?
 912       (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
 913   }
 914   u2 generic_signature_index() const                  {
 915     return _generic_signature_index;
 916   }
 917   void set_generic_signature_index(u2 sig_index)      {
 918     _generic_signature_index = sig_index;
 919   }
 920 
 921   u2 enclosing_method_data(int offset) const;
 922   u2 enclosing_method_class_index() const {
 923     return enclosing_method_data(enclosing_method_class_index_offset);
 924   }
 925   u2 enclosing_method_method_index() {
 926     return enclosing_method_data(enclosing_method_method_index_offset);
 927   }
 928   void set_enclosing_method_indices(u2 class_index,
 929                                     u2 method_index);
 930 
 931   // jmethodID support
 932   jmethodID get_jmethod_id(const methodHandle& method_h);
 933   jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
 934                      jmethodID new_id, jmethodID* new_jmeths,
 935                      jmethodID* to_dealloc_id_p,
 936                      jmethodID** to_dealloc_jmeths_p);
 937   static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
 938                 size_t *length_p, jmethodID* id_p);
 939   void ensure_space_for_methodids(int start_offset = 0);
 940   jmethodID jmethod_id_or_null(Method* method);
 941 
 942   // annotations support
 943   Annotations* annotations() const          { return _annotations; }
 944   void set_annotations(Annotations* anno)   { _annotations = anno; }
 945 
 946   AnnotationArray* class_annotations() const {
 947     return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
 948   }
 949   Array<AnnotationArray*>* fields_annotations() const {
 950     return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
 951   }
 952   AnnotationArray* class_type_annotations() const {
 953     return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
 954   }
 955   Array<AnnotationArray*>* fields_type_annotations() const {
 956     return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
 957   }
 958   // allocation
 959   instanceOop allocate_instance(TRAPS);
 960 
 961   // additional member function to return a handle
 962   instanceHandle allocate_instance_handle(TRAPS);
 963 
 964   objArrayOop allocate_objArray(int n, int length, TRAPS);
 965   // Helper function
 966   static instanceOop register_finalizer(instanceOop i, TRAPS);
 967 
 968   // Check whether reflection/jni/jvm code is allowed to instantiate this class;
 969   // if not, throw either an Error or an Exception.
 970   virtual void check_valid_for_instantiation(bool throwError, TRAPS);
 971 
 972   // initialization
 973   void call_class_initializer(TRAPS);
 974   void set_initialization_state_and_notify(ClassState state, TRAPS);
 975 
 976   // OopMapCache support
 977   OopMapCache* oop_map_cache()               { return _oop_map_cache; }
 978   void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
 979   void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
 980 
 981   // JNI identifier support (for static fields - for jni performance)
 982   JNIid* jni_ids()                               { return _jni_ids; }
 983   void set_jni_ids(JNIid* ids)                   { _jni_ids = ids; }
 984   JNIid* jni_id_for(int offset);
 985 
 986   // maintenance of deoptimization dependencies
 987   inline DependencyContext dependencies();
 988   int  mark_dependent_nmethods(KlassDepChange& changes);
 989   void add_dependent_nmethod(nmethod* nm);
 990   void remove_dependent_nmethod(nmethod* nm);
 991   void clean_dependency_context();
 992 
 993   // On-stack replacement support
 994   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
 995   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
 996   void add_osr_nmethod(nmethod* n);
 997   bool remove_osr_nmethod(nmethod* n);
 998   int mark_osr_nmethods(const Method* m);
 999   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1000 
1001 #if INCLUDE_JVMTI
1002   // Breakpoint support (see methods on Method* for details)
1003   BreakpointInfo* breakpoints() const       { return _breakpoints; };
1004   void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1005 #endif
1006 
1007   // support for stub routines
1008   static ByteSize init_state_offset()  { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1009   JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1010   static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1011 
1012   // subclass/subinterface checks
1013   bool implements_interface(Klass* k) const;
1014   bool is_same_or_direct_interface(Klass* k) const;
1015 
1016 #ifdef ASSERT
1017   // check whether this class or one of its superclasses was redefined
1018   bool has_redefined_this_or_super() const;
1019 #endif
1020 
1021   // Access to the implementor of an interface.
1022   Klass* implementor() const;
1023   void set_implementor(Klass* k);
1024   int  nof_implementors() const;
1025   void add_implementor(Klass* k);  // k is a new class that implements this interface
1026   void init_implementor();           // initialize
1027 
1028   // link this class into the implementors list of every interface it implements
1029   void process_interfaces(Thread *thread);
1030 
1031   // virtual operations from Klass
1032   bool is_leaf_class() const               { return _subklass == NULL; }
1033   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1034                                                   Array<InstanceKlass*>* transitive_interfaces);
1035   bool can_be_primary_super_slow() const;
1036   int oop_size(oop obj)  const             { return size_helper(); }
1037   // slow because it's a virtual call and used for verifying the layout_helper.
1038   // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1039   DEBUG_ONLY(bool is_instance_klass_slow() const      { return true; })
1040 
1041   // Iterators
1042   void do_local_static_fields(FieldClosure* cl);
1043   void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1044   void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1045 
1046   void methods_do(void f(Method* method));
1047   void array_klasses_do(void f(Klass* k));
1048   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1049   bool super_types_do(SuperTypeClosure* blk);
1050 
1051   static InstanceKlass* cast(Klass* k) {
1052     return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1053   }
1054 
1055   static const InstanceKlass* cast(const Klass* k) {
1056     assert(k != NULL, "k should not be null");
1057     assert(k->is_instance_klass(), "cast to InstanceKlass");
1058     return static_cast<const InstanceKlass*>(k);
1059   }
1060 
1061   virtual InstanceKlass* java_super() const {
1062     return (super() == NULL) ? NULL : cast(super());
1063   }
1064 
1065   // Sizing (in words)
1066   static int header_size()            { return sizeof(InstanceKlass)/wordSize; }
1067 
1068   static int size(int vtable_length, int itable_length,
1069                   int nonstatic_oop_map_size,
1070                   bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1071     return align_metadata_size(header_size() +
1072            vtable_length +
1073            itable_length +
1074            nonstatic_oop_map_size +
1075            (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1076            (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1077            (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1078   }
1079   int size() const                    { return size(vtable_length(),
1080                                                itable_length(),
1081                                                nonstatic_oop_map_size(),
1082                                                is_interface(),
1083                                                is_unsafe_anonymous(),
1084                                                has_stored_fingerprint());
1085   }
1086 #if INCLUDE_SERVICES
1087   virtual void collect_statistics(KlassSizeStats *sz) const;
1088 #endif
1089 
1090   intptr_t* start_of_itable()   const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1091   intptr_t* end_of_itable()     const { return start_of_itable() + itable_length(); }
1092 
1093   int  itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1094 
1095   oop static_field_base_raw() { return java_mirror(); }
1096 
1097   OopMapBlock* start_of_nonstatic_oop_maps() const {
1098     return (OopMapBlock*)(start_of_itable() + itable_length());
1099   }
1100 
1101   Klass** end_of_nonstatic_oop_maps() const {
1102     return (Klass**)(start_of_nonstatic_oop_maps() +
1103                      nonstatic_oop_map_count());
1104   }
1105 
1106   Klass* volatile* adr_implementor() const {
1107     if (is_interface()) {
1108       return (Klass* volatile*)end_of_nonstatic_oop_maps();
1109     } else {
1110       return NULL;
1111     }
1112   };
1113 
1114   InstanceKlass** adr_unsafe_anonymous_host() const {
1115     if (is_unsafe_anonymous()) {
1116       InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1117       if (adr_impl != NULL) {
1118         return adr_impl + 1;
1119       } else {
1120         return (InstanceKlass **)end_of_nonstatic_oop_maps();
1121       }
1122     } else {
1123       return NULL;
1124     }
1125   }
1126 
1127   address adr_fingerprint() const {
1128     if (has_stored_fingerprint()) {
1129       InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1130       if (adr_host != NULL) {
1131         return (address)(adr_host + 1);
1132       }
1133 
1134       Klass* volatile* adr_impl = adr_implementor();
1135       if (adr_impl != NULL) {
1136         return (address)(adr_impl + 1);
1137       }
1138 
1139       return (address)end_of_nonstatic_oop_maps();
1140     } else {
1141       return NULL;
1142     }
1143   }
1144 
1145   // Use this to return the size of an instance in heap words:
1146   int size_helper() const {
1147     return layout_helper_to_size_helper(layout_helper());
1148   }
1149 
1150   // This bit is initialized in classFileParser.cpp.
1151   // It is false under any of the following conditions:
1152   //  - the class is abstract (including any interface)
1153   //  - the class has a finalizer (if !RegisterFinalizersAtInit)
1154   //  - the class size is larger than FastAllocateSizeLimit
1155   //  - the class is java/lang/Class, which cannot be allocated directly
1156   bool can_be_fastpath_allocated() const {
1157     return !layout_helper_needs_slow_path(layout_helper());
1158   }
1159 
1160   // Java itable
1161   klassItable itable() const;        // return klassItable wrapper
1162   Method* method_at_itable(Klass* holder, int index, TRAPS);
1163 
1164 #if INCLUDE_JVMTI
1165   void adjust_default_methods(bool* trace_name_printed);
1166 #endif // INCLUDE_JVMTI
1167 
1168   void clean_weak_instanceklass_links();
1169  private:
1170   void clean_implementors_list();
1171   void clean_method_data();
1172 
1173  public:
1174   // Explicit metaspace deallocation of fields
1175   // For RedefineClasses and class file parsing errors, we need to deallocate
1176   // instanceKlasses and the metadata they point to.
1177   void deallocate_contents(ClassLoaderData* loader_data);
1178   static void deallocate_methods(ClassLoaderData* loader_data,
1179                                  Array<Method*>* methods);
1180   void static deallocate_interfaces(ClassLoaderData* loader_data,
1181                                     const Klass* super_klass,
1182                                     Array<InstanceKlass*>* local_interfaces,
1183                                     Array<InstanceKlass*>* transitive_interfaces);
1184 
1185   // The constant pool is on stack if any of the methods are executing or
1186   // referenced by handles.
1187   bool on_stack() const { return _constants->on_stack(); }
1188 
1189   // callbacks for actions during class unloading
1190   static void unload_class(InstanceKlass* ik);
1191   static void release_C_heap_structures(InstanceKlass* ik);
1192 
1193   // Naming
1194   const char* signature_name() const;
1195   static Symbol* package_from_name(const Symbol* name, TRAPS);
1196 
1197   // Oop fields (and metadata) iterators
1198   //
1199   // The InstanceKlass iterators also visits the Object's klass.
1200 
1201   // Forward iteration
1202  public:
1203   // Iterate over all oop fields in the oop maps.
1204   template <typename T, class OopClosureType>
1205   inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1206 
1207   // Iterate over all oop fields and metadata.
1208   template <typename T, class OopClosureType>
1209   inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1210 
1211   // Iterate over all oop fields in one oop map.
1212   template <typename T, class OopClosureType>
1213   inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1214 
1215 
1216   // Reverse iteration
1217   // Iterate over all oop fields and metadata.
1218   template <typename T, class OopClosureType>
1219   inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1220 
1221  private:
1222   // Iterate over all oop fields in the oop maps.
1223   template <typename T, class OopClosureType>
1224   inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1225 
1226   // Iterate over all oop fields in one oop map.
1227   template <typename T, class OopClosureType>
1228   inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1229 
1230 
1231   // Bounded range iteration
1232  public:
1233   // Iterate over all oop fields in the oop maps.
1234   template <typename T, class OopClosureType>
1235   inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1236 
1237   // Iterate over all oop fields and metadata.
1238   template <typename T, class OopClosureType>
1239   inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1240 
1241  private:
1242   // Iterate over all oop fields in one oop map.
1243   template <typename T, class OopClosureType>
1244   inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1245 
1246 
1247  public:
1248   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
1249 
1250 public:
1251   void set_in_error_state() {
1252     assert(DumpSharedSpaces, "only call this when dumping archive");
1253     _init_state = initialization_error;
1254   }
1255   bool check_sharing_error_state();
1256 
1257 private:
1258   // initialization state
1259   void set_init_state(ClassState state);
1260   void set_rewritten()                  { _misc_flags |= _misc_rewritten; }
1261   void set_init_thread(Thread *thread)  { _init_thread = thread; }
1262 
1263   // The RedefineClasses() API can cause new method idnums to be needed
1264   // which will cause the caches to grow. Safety requires different
1265   // cache management logic if the caches can grow instead of just
1266   // going from NULL to non-NULL.
1267   bool idnum_can_increment() const      { return has_been_redefined(); }
1268   inline jmethodID* methods_jmethod_ids_acquire() const;
1269   inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1270 
1271   // Lock during initialization
1272 public:
1273   // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1274   // Must be one per class and it has to be a VM internal object so java code
1275   // cannot lock it (like the mirror).
1276   // It has to be an object not a Mutex because it's held through java calls.
1277   oop init_lock() const;
1278 private:
1279   void fence_and_clear_init_lock();
1280 
1281   bool link_class_impl                           (TRAPS);
1282   bool verify_code                               (TRAPS);
1283   void initialize_impl                           (TRAPS);
1284   void initialize_super_interfaces               (TRAPS);
1285   void eager_initialize_impl                     ();
1286   /* jni_id_for_impl for jfieldID only */
1287   JNIid* jni_id_for_impl                         (int offset);
1288 
1289   // Returns the array class for the n'th dimension
1290   Klass* array_klass_impl(bool or_null, int n, TRAPS);
1291 
1292   // Returns the array class with this class as element type
1293   Klass* array_klass_impl(bool or_null, TRAPS);
1294 
1295   // find a local method (returns NULL if not found)
1296   Method* find_method_impl(const Symbol* name,
1297                            const Symbol* signature,
1298                            OverpassLookupMode overpass_mode,
1299                            StaticLookupMode static_mode,
1300                            PrivateLookupMode private_mode) const;
1301 
1302   static Method* find_method_impl(const Array<Method*>* methods,
1303                                   const Symbol* name,
1304                                   const Symbol* signature,
1305                                   OverpassLookupMode overpass_mode,
1306                                   StaticLookupMode static_mode,
1307                                   PrivateLookupMode private_mode);
1308 
1309   // Free CHeap allocated fields.
1310   void release_C_heap_structures();
1311 
1312 #if INCLUDE_JVMTI
1313   // RedefineClasses support
1314   void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1315   void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1316 #endif
1317 public:
1318   // CDS support - remove and restore oops from metadata. Oops are not shared.
1319   virtual void remove_unshareable_info();
1320   virtual void remove_java_mirror();
1321   virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1322 
1323   // jvm support
1324   jint compute_modifier_flags(TRAPS) const;
1325 
1326 public:
1327   // JVMTI support
1328   jint jvmti_class_status() const;
1329 
1330   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1331 
1332  public:
1333   // Printing
1334 #ifndef PRODUCT
1335   void print_on(outputStream* st) const;
1336 #endif
1337   void print_value_on(outputStream* st) const;
1338 
1339   void oop_print_value_on(oop obj, outputStream* st);
1340 
1341 #ifndef PRODUCT
1342   void oop_print_on      (oop obj, outputStream* st);
1343 
1344   void print_dependent_nmethods(bool verbose = false);
1345   bool is_dependent_nmethod(nmethod* nm);
1346   bool verify_itable_index(int index);
1347 #endif
1348 
1349   const char* internal_name() const;
1350 
1351   // Verification
1352   void verify_on(outputStream* st);
1353 
1354   void oop_verify_on(oop obj, outputStream* st);
1355 
1356   // Logging
1357   void print_class_load_logging(ClassLoaderData* loader_data,
1358                                 const char* module_name,
1359                                 const ClassFileStream* cfs) const;
1360 };
1361 
1362 // for adding methods
1363 // UNSET_IDNUM return means no more ids available
1364 inline u2 InstanceKlass::next_method_idnum() {
1365   if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1366     return ConstMethod::UNSET_IDNUM; // no more ids available
1367   } else {
1368     return _idnum_allocated_count++;
1369   }
1370 }
1371 
1372 
1373 /* JNIid class for jfieldIDs only */
1374 class JNIid: public CHeapObj<mtClass> {
1375   friend class VMStructs;
1376  private:
1377   Klass*             _holder;
1378   JNIid*             _next;
1379   int                _offset;
1380 #ifdef ASSERT
1381   bool               _is_static_field_id;
1382 #endif
1383 
1384  public:
1385   // Accessors
1386   Klass* holder() const           { return _holder; }
1387   int offset() const              { return _offset; }
1388   JNIid* next()                   { return _next; }
1389   // Constructor
1390   JNIid(Klass* holder, int offset, JNIid* next);
1391   // Identifier lookup
1392   JNIid* find(int offset);
1393 
1394   bool find_local_field(fieldDescriptor* fd) {
1395     return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1396   }
1397 
1398   static void deallocate(JNIid* id);
1399   // Debugging
1400 #ifdef ASSERT
1401   bool is_static_field_id() const { return _is_static_field_id; }
1402   void set_is_static_field_id()   { _is_static_field_id = true; }
1403 #endif
1404   void verify(Klass* holder);
1405 };
1406 
1407 // An iterator that's used to access the inner classes indices in the
1408 // InstanceKlass::_inner_classes array.
1409 class InnerClassesIterator : public StackObj {
1410  private:
1411   Array<jushort>* _inner_classes;
1412   int _length;
1413   int _idx;
1414  public:
1415 
1416   InnerClassesIterator(const InstanceKlass* k) {
1417     _inner_classes = k->inner_classes();
1418     if (k->inner_classes() != NULL) {
1419       _length = _inner_classes->length();
1420       // The inner class array's length should be the multiple of
1421       // inner_class_next_offset if it only contains the InnerClasses
1422       // attribute data, or it should be
1423       // n*inner_class_next_offset+enclosing_method_attribute_size
1424       // if it also contains the EnclosingMethod data.
1425       assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1426               _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1427              "just checking");
1428       // Remove the enclosing_method portion if exists.
1429       if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1430         _length -= InstanceKlass::enclosing_method_attribute_size;
1431       }
1432     } else {
1433       _length = 0;
1434     }
1435     _idx = 0;
1436   }
1437 
1438   int length() const {
1439     return _length;
1440   }
1441 
1442   void next() {
1443     _idx += InstanceKlass::inner_class_next_offset;
1444   }
1445 
1446   bool done() const {
1447     return (_idx >= _length);
1448   }
1449 
1450   u2 inner_class_info_index() const {
1451     return _inner_classes->at(
1452                _idx + InstanceKlass::inner_class_inner_class_info_offset);
1453   }
1454 
1455   void set_inner_class_info_index(u2 index) {
1456     _inner_classes->at_put(
1457                _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1458   }
1459 
1460   u2 outer_class_info_index() const {
1461     return _inner_classes->at(
1462                _idx + InstanceKlass::inner_class_outer_class_info_offset);
1463   }
1464 
1465   void set_outer_class_info_index(u2 index) {
1466     _inner_classes->at_put(
1467                _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1468   }
1469 
1470   u2 inner_name_index() const {
1471     return _inner_classes->at(
1472                _idx + InstanceKlass::inner_class_inner_name_offset);
1473   }
1474 
1475   void set_inner_name_index(u2 index) {
1476     _inner_classes->at_put(
1477                _idx + InstanceKlass::inner_class_inner_name_offset, index);
1478   }
1479 
1480   u2 inner_access_flags() const {
1481     return _inner_classes->at(
1482                _idx + InstanceKlass::inner_class_access_flags_offset);
1483   }
1484 };
1485 
1486 #endif // SHARE_OOPS_INSTANCEKLASS_HPP