jdk8-mips64-public/hotspot: src/share/vm/oops/instanceKlass.hpp@ac27a9c85bea (annotated)

src/share/vm/oops/instanceKlass.hpp@ac27a9c85bea (annotated)

src/share/vm/oops/instanceKlass.hpp

Thu, 24 May 2018 18:41:44 +0800

author: aoqi
date: Thu, 24 May 2018 18:41:44 +0800
changeset 8856: ac27a9c85bea
parent 8721: 575f637864df
parent 8604: 04d83ba48607
child 9041: 95a08233f46c
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
 #include "classfile/classLoaderData.hpp"
 #include "memory/referenceType.hpp"
 #include "oops/annotations.hpp"
 #include "oops/constMethod.hpp"
 #include "oops/fieldInfo.hpp"
 #include "oops/instanceOop.hpp"
 #include "oops/klassVtable.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/os.hpp"
 #include "utilities/accessFlags.hpp"
 #include "utilities/bitMap.inline.hpp"
 #include "utilities/macros.hpp"
 #include "trace/traceMacros.hpp"
 // An InstanceKlass is the VM level representation of a Java class.
 // It contains all information needed for at class at execution runtime.
 //  InstanceKlass layout:
 //    [C++ vtbl pointer           ] Klass
 //    [subtype cache              ] Klass
 //    [instance size              ] Klass
 //    [java mirror                ] Klass
 //    [super                      ] Klass
 //    [access_flags               ] Klass
 //    [name                       ] Klass
 //    [first subklass             ] Klass
 //    [next sibling               ] Klass
 //    [array klasses              ]
 //    [methods                    ]
 //    [local interfaces           ]
 //    [transitive interfaces      ]
 //    [fields                     ]
 //    [constants                  ]
 //    [class loader               ]
 //    [source file name           ]
 //    [inner classes              ]
 //    [static field size          ]
 //    [nonstatic field size       ]
 //    [static oop fields size     ]
 //    [nonstatic oop maps size    ]
 //    [has finalize method        ]
 //    [deoptimization mark bit    ]
 //    [initialization state       ]
 //    [initializing thread        ]
 //    [Java vtable length         ]
 //    [oop map cache (stack maps) ]
 //    [EMBEDDED Java vtable             ] size in words = vtable_len
 //    [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
 //      The embedded nonstatic oop-map blocks are short pairs (offset, length)
 //      indicating where oops are located in instances of this klass.
 //    [EMBEDDED implementor of the interface] only exist for interface
 //    [EMBEDDED host klass        ] only exist for an anonymous class (JSR 292 enabled)
 // forward declaration for class -- see below for definition
 class SuperTypeClosure;
 class JNIid;
 class jniIdMapBase;
 class BreakpointInfo;
 class fieldDescriptor;
 class DepChange;
 class nmethodBucket;
 class PreviousVersionNode;
 class JvmtiCachedClassFieldMap;
 class MemberNameTable;
 // This is used in iterators below.
 class FieldClosure: public StackObj {
 public:
   virtual void do_field(fieldDescriptor* fd) = 0;
 };
 #ifndef PRODUCT
 // Print fields.
 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
 class FieldPrinter: public FieldClosure {
    oop _obj;
    outputStream* _st;
  public:
    FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
    void do_field(fieldDescriptor* fd);
 };
 #endif  // !PRODUCT
 // ValueObjs embedded in klass. Describes where oops are located in instances of
 // this klass.
 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
  public:
   // Byte offset of the first oop mapped by this block.
   int offset() const          { return _offset; }
   void set_offset(int offset) { _offset = offset; }
   // Number of oops in this block.
   uint count() const         { return _count; }
   void set_count(uint count) { _count = count; }
   // sizeof(OopMapBlock) in HeapWords.
   static const int size_in_words() {
     return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
       LogHeapWordSize;
   }
  private:
   int  _offset;
   uint _count;
 };
 struct JvmtiCachedClassFileData;
 class InstanceKlass: public Klass {
   friend class VMStructs;
   friend class ClassFileParser;
   friend class CompileReplay;
  protected:
   // Constructor
   InstanceKlass(int vtable_len,
                 int itable_len,
                 int static_field_size,
                 int nonstatic_oop_map_size,
                 ReferenceType rt,
                 AccessFlags access_flags,
                 bool is_anonymous);
  public:
   static InstanceKlass* allocate_instance_klass(
                                           ClassLoaderData* loader_data,
                                           int vtable_len,
                                           int itable_len,
                                           int static_field_size,
                                           int nonstatic_oop_map_size,
                                           ReferenceType rt,
                                           AccessFlags access_flags,
                                           Symbol* name,
                                           Klass* super_klass,
                                           bool is_anonymous,
                                           TRAPS);
   InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
   // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
   // of the class loading & initialization procedure, and the use of the states.
   enum ClassState {
     allocated,                          // allocated (but not yet linked)
     loaded,                             // loaded and inserted in class hierarchy (but not linked yet)
     linked,                             // successfully linked/verified (but not initialized yet)
     being_initialized,                  // currently running class initializer
     fully_initialized,                  // initialized (successfull final state)
     initialization_error                // error happened during initialization
   };
   static int number_of_instance_classes() { return _total_instanceKlass_count; }
  private:
   static volatile int _total_instanceKlass_count;
  protected:
   // Annotations for this class
   Annotations*    _annotations;
   // Array classes holding elements of this class.
   Klass*          _array_klasses;
   // Constant pool for this class.
   ConstantPool* _constants;
   // The InnerClasses attribute and EnclosingMethod attribute. The
   // _inner_classes is an array of shorts. If the class has InnerClasses
   // attribute, then the _inner_classes array begins with 4-tuples of shorts
   // [inner_class_info_index, outer_class_info_index,
   // inner_name_index, inner_class_access_flags] for the InnerClasses
   // attribute. If the EnclosingMethod attribute exists, it occupies the
   // last two shorts [class_index, method_index] of the array. If only
   // the InnerClasses attribute exists, the _inner_classes array length is
   // number_of_inner_classes * 4. If the class has both InnerClasses
   // and EnclosingMethod attributes the _inner_classes array length is
   // number_of_inner_classes * 4 + enclosing_method_attribute_size.
   Array<jushort>* _inner_classes;
   // the source debug extension for this klass, NULL if not specified.
   // Specified as UTF-8 string without terminating zero byte in the classfile,
   // it is stored in the instanceklass as a NULL-terminated UTF-8 string
   char*           _source_debug_extension;
   // Array name derived from this class which needs unreferencing
   // if this class is unloaded.
   Symbol*         _array_name;
   // Number of heapOopSize words used by non-static fields in this klass
   // (including inherited fields but after header_size()).
   int             _nonstatic_field_size;
   int             _static_field_size;    // number words used by static fields (oop and non-oop) in this klass
   // Constant pool index to the utf8 entry of the Generic signature,
   // or 0 if none.
   u2              _generic_signature_index;
   // Constant pool index to the utf8 entry for the name of source file
   // containing this klass, 0 if not specified.
   u2              _source_file_name_index;
   u2              _static_oop_field_count;// number of static oop fields in this klass
   u2              _java_fields_count;    // The number of declared Java fields
   int             _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
   // _is_marked_dependent can be set concurrently, thus cannot be part of the
   // _misc_flags.
   bool            _is_marked_dependent;  // used for marking during flushing and deoptimization
   bool            _has_unloaded_dependent;
   enum {
     _misc_rewritten                = 1 << 0, // methods rewritten.
     _misc_has_nonstatic_fields     = 1 << 1, // for sizing with UseCompressedOops
     _misc_should_verify_class      = 1 << 2, // allow caching of preverification
     _misc_is_anonymous             = 1 << 3, // has embedded _host_klass field
     _misc_is_contended             = 1 << 4, // marked with contended annotation
     _misc_has_default_methods      = 1 << 5, // class/superclass/implemented interfaces has default methods
     _misc_declares_default_methods = 1 << 6  // directly declares default methods (any access)
   };
   u2              _misc_flags;
   u2              _minor_version;        // minor version number of class file
   u2              _major_version;        // major version number of class file
   Thread*         _init_thread;          // Pointer to current thread doing initialization (to handle recusive initialization)
   int             _vtable_len;           // length of Java vtable (in words)
   int             _itable_len;           // length of Java itable (in words)
   OopMapCache*    volatile _oop_map_cache;   // OopMapCache for all methods in the klass (allocated lazily)
   MemberNameTable* _member_names;        // Member names
   JNIid*          _jni_ids;              // First JNI identifier for static fields in this class
   jmethodID*      _methods_jmethod_ids;  // jmethodIDs corresponding to method_idnum, or NULL if none
   nmethodBucket*  _dependencies;         // list of dependent nmethods
   nmethod*        _osr_nmethods_head;    // Head of list of on-stack replacement nmethods for this class
   BreakpointInfo* _breakpoints;          // bpt lists, managed by Method*
   // Array of interesting part(s) of the previous version(s) of this
   // InstanceKlass. See PreviousVersionWalker below.
   GrowableArray<PreviousVersionNode *>* _previous_versions;
   // JVMTI fields can be moved to their own structure - see 6315920
   // JVMTI: cached class file, before retransformable agent modified it in CFLH
   JvmtiCachedClassFileData* _cached_class_file;
   volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
   // Class states are defined as ClassState (see above).
   // Place the _init_state here to utilize the unused 2-byte after
   // _idnum_allocated_count.
   u1              _init_state;                    // state of class
   u1              _reference_type;                // reference type
   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
   NOT_PRODUCT(int _verify_count;)  // to avoid redundant verifies
   // Method array.
   Array<Method*>* _methods;
   // Default Method Array, concrete methods inherited from interfaces
   Array<Method*>* _default_methods;
   // Interface (Klass*s) this class declares locally to implement.
   Array<Klass*>* _local_interfaces;
   // Interface (Klass*s) this class implements transitively.
   Array<Klass*>* _transitive_interfaces;
   // Int array containing the original order of method in the class file (for JVMTI).
   Array<int>*     _method_ordering;
   // Int array containing the vtable_indices for default_methods
   // offset matches _default_methods offset
   Array<int>*     _default_vtable_indices;
   // Instance and static variable information, starts with 6-tuples of shorts
   // [access, name index, sig index, initval index, low_offset, high_offset]
   // for all fields, followed by the generic signature data at the end of
   // the array. Only fields with generic signature attributes have the generic
   // signature data set in the array. The fields array looks like following:
   //
   // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
   // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
   //      ...
   // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
   //     [generic signature index]
   //     [generic signature index]
   //     ...
   Array<u2>*      _fields;
   // embedded Java vtable follows here
   // embedded Java itables follows here
   // embedded static fields follows here
   // embedded nonstatic oop-map blocks follows here
   // embedded implementor of this interface follows here
   //   The embedded implementor only exists if the current klass is an
   //   iterface. The possible values of the implementor fall into following
   //   three cases:
   //     NULL: no implementor.
   //     A Klass* that's not itself: one implementor.
   //     Itself: more than one implementors.
   // embedded host klass follows here
   //   The embedded host klass only exists in an anonymous class for
   //   dynamic language support (JSR 292 enabled). The host class grants
   //   its access privileges to this class also. The host class is either
   //   named, or a previously loaded anonymous class. A non-anonymous class
   //   or an anonymous class loaded through normal classloading does not
   //   have this embedded field.
   //
   friend class SystemDictionary;
  public:
   bool has_nonstatic_fields() const        {
     return (_misc_flags & _misc_has_nonstatic_fields) != 0;
   }
   void set_has_nonstatic_fields(bool b)    {
     if (b) {
       _misc_flags |= _misc_has_nonstatic_fields;
     } else {
       _misc_flags &= ~_misc_has_nonstatic_fields;
     }
   }
   // field sizes
   int nonstatic_field_size() const         { return _nonstatic_field_size; }
   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
   int static_field_size() const            { return _static_field_size; }
   void set_static_field_size(int size)     { _static_field_size = size; }
   int static_oop_field_count() const       { return (int)_static_oop_field_count; }
   void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
   // Java vtable
   int  vtable_length() const               { return _vtable_len; }
   void set_vtable_length(int len)          { _vtable_len = len; }
   // Java itable
   int  itable_length() const               { return _itable_len; }
   void set_itable_length(int len)          { _itable_len = len; }
   // array klasses
   Klass* array_klasses() const             { return _array_klasses; }
   void set_array_klasses(Klass* k)         { _array_klasses = k; }
   // methods
   Array<Method*>* methods() const          { return _methods; }
   void set_methods(Array<Method*>* a)      { _methods = a; }
   Method* method_with_idnum(int idnum);
   Method* method_with_orig_idnum(int idnum);
   Method* method_with_orig_idnum(int idnum, int version);
   // method ordering
   Array<int>* method_ordering() const     { return _method_ordering; }
   void set_method_ordering(Array<int>* m) { _method_ordering = m; }
   void copy_method_ordering(intArray* m, TRAPS);
   // default_methods
   Array<Method*>* default_methods() const  { return _default_methods; }
   void set_default_methods(Array<Method*>* a) { _default_methods = a; }
   // default method vtable_indices
   Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
   void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
   Array<int>* create_new_default_vtable_indices(int len, TRAPS);
   // interfaces
   Array<Klass*>* local_interfaces() const          { return _local_interfaces; }
   void set_local_interfaces(Array<Klass*>* a)      {
     guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
     _local_interfaces = a; }
   Array<Klass*>* transitive_interfaces() const     { return _transitive_interfaces; }
   void set_transitive_interfaces(Array<Klass*>* a) {
     guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
     _transitive_interfaces = a;
   }
  private:
   friend class fieldDescriptor;
   FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
  public:
   int     field_offset      (int index) const { return field(index)->offset(); }
   int     field_access_flags(int index) const { return field(index)->access_flags(); }
   Symbol* field_name        (int index) const { return field(index)->name(constants()); }
   Symbol* field_signature   (int index) const { return field(index)->signature(constants()); }
   // Number of Java declared fields
   int java_fields_count() const           { return (int)_java_fields_count; }
   Array<u2>* fields() const            { return _fields; }
   void set_fields(Array<u2>* f, u2 java_fields_count) {
     guarantee(_fields == NULL || f == NULL, "Just checking");
     _fields = f;
     _java_fields_count = java_fields_count;
   }
   // inner classes
   Array<u2>* inner_classes() const       { return _inner_classes; }
   void set_inner_classes(Array<u2>* f)   { _inner_classes = f; }
   enum InnerClassAttributeOffset {
     // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
     inner_class_inner_class_info_offset = 0,
     inner_class_outer_class_info_offset = 1,
     inner_class_inner_name_offset = 2,
     inner_class_access_flags_offset = 3,
     inner_class_next_offset = 4
   };
   enum EnclosingMethodAttributeOffset {
     enclosing_method_class_index_offset = 0,
     enclosing_method_method_index_offset = 1,
     enclosing_method_attribute_size = 2
   };
   // method override check
   bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
   // package
   bool is_same_class_package(Klass* class2);
   bool is_same_class_package(oop classloader2, Symbol* classname2);
   static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
   // find an enclosing class (defined where original code was, in jvm.cpp!)
   Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
     instanceKlassHandle self(THREAD, this);
     return compute_enclosing_class_impl(self, inner_is_member, THREAD);
   }
   static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
                                                bool* inner_is_member, TRAPS);
   // tell if two classes have the same enclosing class (at package level)
   bool is_same_package_member(Klass* class2, TRAPS) {
     instanceKlassHandle self(THREAD, this);
     return is_same_package_member_impl(self, class2, THREAD);
   }
   static bool is_same_package_member_impl(instanceKlassHandle self,
                                           Klass* class2, TRAPS);
   // initialization state
   bool is_loaded() const                   { return _init_state >= loaded; }
   bool is_linked() const                   { return _init_state >= linked; }
   bool is_initialized() const              { return _init_state == fully_initialized; }
   bool is_not_initialized() const          { return _init_state <  being_initialized; }
   bool is_being_initialized() const        { return _init_state == being_initialized; }
   bool is_in_error_state() const           { return _init_state == initialization_error; }
   bool is_reentrant_initialization(Thread *thread)  { return thread == _init_thread; }
   ClassState  init_state()                 { return (ClassState)_init_state; }
   bool is_rewritten() const                { return (_misc_flags & _misc_rewritten) != 0; }
   // defineClass specified verification
   bool should_verify_class() const         {
     return (_misc_flags & _misc_should_verify_class) != 0;
   }
   void set_should_verify_class(bool value) {
     if (value) {
       _misc_flags |= _misc_should_verify_class;
     } else {
       _misc_flags &= ~_misc_should_verify_class;
     }
   }
   // marking
   bool is_marked_dependent() const         { return _is_marked_dependent; }
   void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
   bool has_unloaded_dependent() const         { return _has_unloaded_dependent; }
   void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
   // initialization (virtuals from Klass)
   bool should_be_initialized() const;  // means that initialize should be called
   void initialize(TRAPS);
   void link_class(TRAPS);
   bool link_class_or_fail(TRAPS); // returns false on failure
   void unlink_class();
   void rewrite_class(TRAPS);
   void link_methods(TRAPS);
   Method* class_initializer();
   // set the class to initialized if no static initializer is present
   void eager_initialize(Thread *thread);
   // reference type
   ReferenceType reference_type() const     { return (ReferenceType)_reference_type; }
   void set_reference_type(ReferenceType t) {
     assert(t == (u1)t, "overflow");
     _reference_type = (u1)t;
   }
   static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
   // find local field, returns true if found
   bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
   // find field in direct superinterfaces, returns the interface in which the field is defined
   Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
   // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
   // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
   Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
   // find a non-static or static field given its offset within the class.
   bool contains_field_offset(int offset) {
     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
   }
   bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
   bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
   // find a local method (returns NULL if not found)
   Method* find_method(Symbol* name, Symbol* signature) const;
   static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
   // find a local method, but skip static methods
   Method* find_instance_method(Symbol* name, Symbol* signature);
   static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
   // find a local method (returns NULL if not found)
   Method* find_local_method(Symbol* name, Symbol* signature,
                            OverpassLookupMode overpass_mode,
                            StaticLookupMode static_mode,
                            PrivateLookupMode private_mode) const;
   // find a local method from given methods array (returns NULL if not found)
   static Method* find_local_method(Array<Method*>* methods,
                            Symbol* name, Symbol* signature,
                            OverpassLookupMode overpass_mode,
                            StaticLookupMode static_mode,
                            PrivateLookupMode private_mode);
   // true if method matches signature and conforms to skipping_X conditions.
   static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
   // find a local method index in methods or default_methods (returns -1 if not found)
   static int find_method_index(Array<Method*>* methods,
                                Symbol* name, Symbol* signature,
                                OverpassLookupMode overpass_mode,
                                StaticLookupMode static_mode,
                                PrivateLookupMode private_mode);
   // lookup operation (returns NULL if not found)
   Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
   // lookup a method in all the interfaces that this class implements
   // (returns NULL if not found)
   Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
   // lookup a method in local defaults then in all interfaces
   // (returns NULL if not found)
   Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
   // Find method indices by name.  If a method with the specified name is
   // found the index to the first method is returned, and 'end' is filled in
   // with the index of first non-name-matching method.  If no method is found
   // -1 is returned.
   int find_method_by_name(Symbol* name, int* end);
   static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
   // constant pool
   ConstantPool* constants() const        { return _constants; }
   void set_constants(ConstantPool* c)    { _constants = c; }
   // protection domain
   oop protection_domain() const;
   // signers
   objArrayOop signers() const;
   // host class
   Klass* host_klass() const              {
     Klass** hk = (Klass**)adr_host_klass();
     if (hk == NULL) {
       return NULL;
     } else {
       assert(*hk != NULL, "host klass should always be set if the address is not null");
       return *hk;
     }
   }
   void set_host_klass(Klass* host)            {
     assert(is_anonymous(), "not anonymous");
     Klass** addr = (Klass**)adr_host_klass();
     assert(addr != NULL, "no reversed space");
     if (addr != NULL) {
       *addr = host;
     }
   }
   bool is_anonymous() const                {
     return (_misc_flags & _misc_is_anonymous) != 0;
   }
   void set_is_anonymous(bool value)        {
     if (value) {
       _misc_flags |= _misc_is_anonymous;
     } else {
       _misc_flags &= ~_misc_is_anonymous;
     }
   }
   // Oop that keeps the metadata for this class from being unloaded
   // in places where the metadata is stored in other places, like nmethods
   oop klass_holder() const {
     return is_anonymous() ? java_mirror() : class_loader();
   }
   bool is_contended() const                {
     return (_misc_flags & _misc_is_contended) != 0;
   }
   void set_is_contended(bool value)        {
     if (value) {
       _misc_flags |= _misc_is_contended;
     } else {
       _misc_flags &= ~_misc_is_contended;
     }
   }
   // source file name
   Symbol* source_file_name() const               {
     return (_source_file_name_index == 0) ?
       (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
   }
   u2 source_file_name_index() const              {
     return _source_file_name_index;
   }
   void set_source_file_name_index(u2 sourcefile_index) {
     _source_file_name_index = sourcefile_index;
   }
   // minor and major version numbers of class file
   u2 minor_version() const                 { return _minor_version; }
   void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
   u2 major_version() const                 { return _major_version; }
   void set_major_version(u2 major_version) { _major_version = major_version; }
   // source debug extension
   char* source_debug_extension() const     { return _source_debug_extension; }
   void set_source_debug_extension(char* array, int length);
   // symbol unloading support (refcount already added)
   Symbol* array_name()                     { return _array_name; }
   void set_array_name(Symbol* name)        { assert(_array_name == NULL  || name == NULL, "name already created"); _array_name = name; }
   // nonstatic oop-map blocks
   static int nonstatic_oop_map_size(unsigned int oop_map_count) {
     return oop_map_count * OopMapBlock::size_in_words();
   }
   unsigned int nonstatic_oop_map_count() const {
     return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
   }
   int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
   void set_nonstatic_oop_map_size(int words) {
     _nonstatic_oop_map_size = words;
   }
   // RedefineClasses() support for previous versions:
   void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
          int emcp_method_count);
   // If the _previous_versions array is non-NULL, then this klass
   // has been redefined at least once even if we aren't currently
   // tracking a previous version.
   bool has_been_redefined() const { return _previous_versions != NULL; }
   bool has_previous_version() const;
   void init_previous_versions() {
     _previous_versions = NULL;
   }
   GrowableArray<PreviousVersionNode *>* previous_versions() const {
     return _previous_versions;
   }
   InstanceKlass* get_klass_version(int version);
   static void purge_previous_versions(InstanceKlass* ik);
   // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
   void set_cached_class_file(JvmtiCachedClassFileData *data) {
     _cached_class_file = data;
   }
   JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
   jint get_cached_class_file_len();
   unsigned char * get_cached_class_file_bytes();
   // JVMTI: Support for caching of field indices, types, and offsets
   void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
     _jvmti_cached_class_field_map = descriptor;
   }
   JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
     return _jvmti_cached_class_field_map;
   }
   bool has_default_methods() const {
     return (_misc_flags & _misc_has_default_methods) != 0;
   }
   void set_has_default_methods(bool b) {
     if (b) {
       _misc_flags |= _misc_has_default_methods;
     } else {
       _misc_flags &= ~_misc_has_default_methods;
     }
   }
   bool declares_default_methods() const {
     return (_misc_flags & _misc_declares_default_methods) != 0;
   }
   void set_declares_default_methods(bool b) {
     if (b) {
       _misc_flags |= _misc_declares_default_methods;
     } else {
       _misc_flags &= ~_misc_declares_default_methods;
     }
   }
   // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
   inline u2 next_method_idnum();
   void set_initial_method_idnum(u2 value)             { _idnum_allocated_count = value; }
   // generics support
   Symbol* generic_signature() const                   {
     return (_generic_signature_index == 0) ?
       (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
   }
   u2 generic_signature_index() const                  {
     return _generic_signature_index;
   }
   void set_generic_signature_index(u2 sig_index)      {
     _generic_signature_index = sig_index;
   }
   u2 enclosing_method_data(int offset);
   u2 enclosing_method_class_index() {
     return enclosing_method_data(enclosing_method_class_index_offset);
   }
   u2 enclosing_method_method_index() {
     return enclosing_method_data(enclosing_method_method_index_offset);
   }
   void set_enclosing_method_indices(u2 class_index,
                                     u2 method_index);
   // jmethodID support
   static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
                      methodHandle method_h);
   static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
                      size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
                      jmethodID* to_dealloc_id_p,
                      jmethodID** to_dealloc_jmeths_p);
   static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
                 size_t *length_p, jmethodID* id_p);
   jmethodID jmethod_id_or_null(Method* method);
   // annotations support
   Annotations* annotations() const          { return _annotations; }
   void set_annotations(Annotations* anno)   { _annotations = anno; }
   AnnotationArray* class_annotations() const {
     return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
   }
   Array<AnnotationArray*>* fields_annotations() const {
     return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
   }
   AnnotationArray* class_type_annotations() const {
     return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
   }
   Array<AnnotationArray*>* fields_type_annotations() const {
     return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
   }
   // allocation
   instanceOop allocate_instance(TRAPS);
   // additional member function to return a handle
   instanceHandle allocate_instance_handle(TRAPS)      { return instanceHandle(THREAD, allocate_instance(THREAD)); }
   objArrayOop allocate_objArray(int n, int length, TRAPS);
   // Helper function
   static instanceOop register_finalizer(instanceOop i, TRAPS);
   // Check whether reflection/jni/jvm code is allowed to instantiate this class;
   // if not, throw either an Error or an Exception.
   virtual void check_valid_for_instantiation(bool throwError, TRAPS);
   // initialization
   void call_class_initializer(TRAPS);
   void set_initialization_state_and_notify(ClassState state, TRAPS);
   // OopMapCache support
   OopMapCache* oop_map_cache()               { return _oop_map_cache; }
   void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
   void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
   // JNI identifier support (for static fields - for jni performance)
   JNIid* jni_ids()                               { return _jni_ids; }
   void set_jni_ids(JNIid* ids)                   { _jni_ids = ids; }
   JNIid* jni_id_for(int offset);
   // maintenance of deoptimization dependencies
   int mark_dependent_nmethods(DepChange& changes);
   void add_dependent_nmethod(nmethod* nm);
   void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
   // On-stack replacement support
   nmethod* osr_nmethods_head() const         { return _osr_nmethods_head; };
   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
   void add_osr_nmethod(nmethod* n);
   void remove_osr_nmethod(nmethod* n);
   int mark_osr_nmethods(const Method* m);
   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
   // Breakpoint support (see methods on Method* for details)
   BreakpointInfo* breakpoints() const       { return _breakpoints; };
   void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
   // support for stub routines
   static ByteSize init_state_offset()  { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
   TRACE_DEFINE_OFFSET;
   static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
   // subclass/subinterface checks
   bool implements_interface(Klass* k) const;
   bool is_same_or_direct_interface(Klass* k) const;
 #ifdef ASSERT
   // check whether this class or one of its superclasses was redefined
   bool has_redefined_this_or_super() const;
 #endif
   // Access to the implementor of an interface.
   Klass* implementor() const
   {
     Klass** k = adr_implementor();
     if (k == NULL) {
       return NULL;
     } else {
       return *k;
     }
   }
   void set_implementor(Klass* k) {
     assert(is_interface(), "not interface");
     Klass** addr = adr_implementor();
     assert(addr != NULL, "null addr");
     if (addr != NULL) {
       *addr = k;
     }
   }
   int  nof_implementors() const       {
     Klass* k = implementor();
     if (k == NULL) {
       return 0;
     } else if (k != this) {
       return 1;
     } else {
       return 2;
     }
   }
   void add_implementor(Klass* k);  // k is a new class that implements this interface
   void init_implementor();           // initialize
   // link this class into the implementors list of every interface it implements
   void process_interfaces(Thread *thread);
   // virtual operations from Klass
   bool is_leaf_class() const               { return _subklass == NULL; }
   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
   bool compute_is_subtype_of(Klass* k);
   bool can_be_primary_super_slow() const;
   int oop_size(oop obj)  const             { return size_helper(); }
   bool oop_is_instance_slow() const        { return true; }
   // Iterators
   void do_local_static_fields(FieldClosure* cl);
   void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
   void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
   void methods_do(void f(Method* method));
   void array_klasses_do(void f(Klass* k));
   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
   bool super_types_do(SuperTypeClosure* blk);
   // Casting from Klass*
   static InstanceKlass* cast(Klass* k) {
     assert(k == NULL || k->is_klass(), "must be");
     assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
     return (InstanceKlass*) k;
   }
   InstanceKlass* java_super() const {
     return (super() == NULL) ? NULL : cast(super());
   }
   // Sizing (in words)
   static int header_size()            { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
   static int size(int vtable_length, int itable_length,
                   int nonstatic_oop_map_size,
                   bool is_interface, bool is_anonymous) {
     return align_object_size(header_size() +
            align_object_offset(vtable_length) +
            align_object_offset(itable_length) +
            ((is_interface || is_anonymous) ?
              align_object_offset(nonstatic_oop_map_size) :
              nonstatic_oop_map_size) +
            (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
            (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
   }
   int size() const                    { return size(vtable_length(),
                                                itable_length(),
                                                nonstatic_oop_map_size(),
                                                is_interface(),
                                                is_anonymous());
   }
 #if INCLUDE_SERVICES
   virtual void collect_statistics(KlassSizeStats *sz) const;
 #endif
   static int vtable_start_offset()    { return header_size(); }
   static int vtable_length_offset()   { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
   intptr_t* start_of_vtable() const        { return ((intptr_t*)this) + vtable_start_offset(); }
   intptr_t* start_of_itable() const        { return start_of_vtable() + align_object_offset(vtable_length()); }
   int  itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
   intptr_t* end_of_itable() const          { return start_of_itable() + itable_length(); }
   address static_field_addr(int offset);
   OopMapBlock* start_of_nonstatic_oop_maps() const {
     return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
   }
   Klass** end_of_nonstatic_oop_maps() const {
     return (Klass**)(start_of_nonstatic_oop_maps() +
                      nonstatic_oop_map_count());
   }
   Klass** adr_implementor() const {
     if (is_interface()) {
       return (Klass**)end_of_nonstatic_oop_maps();
     } else {
       return NULL;
     }
   };
   Klass** adr_host_klass() const {
     if (is_anonymous()) {
       Klass** adr_impl = adr_implementor();
       if (adr_impl != NULL) {
         return adr_impl + 1;
       } else {
         return end_of_nonstatic_oop_maps();
       }
     } else {
       return NULL;
     }
   }
   // Use this to return the size of an instance in heap words:
   int size_helper() const {
     return layout_helper_to_size_helper(layout_helper());
   }
   // This bit is initialized in classFileParser.cpp.
   // It is false under any of the following conditions:
   //  - the class is abstract (including any interface)
   //  - the class has a finalizer (if !RegisterFinalizersAtInit)
   //  - the class size is larger than FastAllocateSizeLimit
   //  - the class is java/lang/Class, which cannot be allocated directly
   bool can_be_fastpath_allocated() const {
     return !layout_helper_needs_slow_path(layout_helper());
   }
   // Java vtable/itable
   klassVtable* vtable() const;        // return new klassVtable wrapper
   inline Method* method_at_vtable(int index);
   klassItable* itable() const;        // return new klassItable wrapper
   Method* method_at_itable(Klass* holder, int index, TRAPS);
 #if INCLUDE_JVMTI
   void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
 #endif // INCLUDE_JVMTI
   // Garbage collection
   void oop_follow_contents(oop obj);
   int  oop_adjust_pointers(oop obj);
   void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
   void clean_implementors_list(BoolObjectClosure* is_alive);
   void clean_method_data(BoolObjectClosure* is_alive);
   void clean_dependent_nmethods();
   // Explicit metaspace deallocation of fields
   // For RedefineClasses and class file parsing errors, we need to deallocate
   // instanceKlasses and the metadata they point to.
   void deallocate_contents(ClassLoaderData* loader_data);
   static void deallocate_methods(ClassLoaderData* loader_data,
                                  Array<Method*>* methods);
   void static deallocate_interfaces(ClassLoaderData* loader_data,
                                     Klass* super_klass,
                                     Array<Klass*>* local_interfaces,
                                     Array<Klass*>* transitive_interfaces);
   // The constant pool is on stack if any of the methods are executing or
   // referenced by handles.
   bool on_stack() const { return _constants->on_stack(); }
   // callbacks for actions during class unloading
   static void notify_unload_class(InstanceKlass* ik);
   static void release_C_heap_structures(InstanceKlass* ik);
   // Parallel Scavenge and Parallel Old
   PARALLEL_GC_DECLS
   // Naming
   const char* signature_name() const;
   // Iterators
   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
     return oop_oop_iterate_v(obj, blk);
   }
   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
     return oop_oop_iterate_v_m(obj, blk, mr);
   }
 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)      \
   int  oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);           \
   int  oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk,        \
                                       MemRegion mr);
   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
 #if INCLUDE_ALL_GCS
 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
   int  oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
 #endif // INCLUDE_ALL_GCS
   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
 public:
   void set_in_error_state() {
     assert(DumpSharedSpaces, "only call this when dumping archive");
     _init_state = initialization_error;
   }
   bool check_sharing_error_state();
 private:
   // initialization state
 #ifdef ASSERT
   void set_init_state(ClassState state);
 #else
   void set_init_state(ClassState state) { _init_state = (u1)state; }
 #endif
   void set_rewritten()                  { _misc_flags |= _misc_rewritten; }
   void set_init_thread(Thread *thread)  { _init_thread = thread; }
   // The RedefineClasses() API can cause new method idnums to be needed
   // which will cause the caches to grow. Safety requires different
   // cache management logic if the caches can grow instead of just
   // going from NULL to non-NULL.
   bool idnum_can_increment() const      { return has_been_redefined(); }
   jmethodID* methods_jmethod_ids_acquire() const
          { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
   void release_set_methods_jmethod_ids(jmethodID* jmeths)
          { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
   // Lock during initialization
 public:
   // Lock for (1) initialization; (2) access to the ConstantPool of this class.
   // Must be one per class and it has to be a VM internal object so java code
   // cannot lock it (like the mirror).
   // It has to be an object not a Mutex because it's held through java calls.
   oop init_lock() const;
 private:
   void fence_and_clear_init_lock();
   // Static methods that are used to implement member methods where an exposed this pointer
   // is needed due to possible GCs
   static bool link_class_impl                           (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
   static bool verify_code                               (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
   static void initialize_impl                           (instanceKlassHandle this_oop, TRAPS);
   static void initialize_super_interfaces               (instanceKlassHandle this_oop, TRAPS);
   static void eager_initialize_impl                     (instanceKlassHandle this_oop);
   static void set_initialization_state_and_notify_impl  (instanceKlassHandle this_oop, ClassState state, TRAPS);
   static void call_class_initializer_impl               (instanceKlassHandle this_oop, TRAPS);
   static Klass* array_klass_impl                      (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
   static void do_local_static_fields_impl               (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
   /* jni_id_for_impl for jfieldID only */
   static JNIid* jni_id_for_impl                         (instanceKlassHandle this_oop, int offset);
   // Returns the array class for the n'th dimension
   Klass* array_klass_impl(bool or_null, int n, TRAPS);
   // Returns the array class with this class as element type
   Klass* array_klass_impl(bool or_null, TRAPS);
   // find a local method (returns NULL if not found)
   Method* find_method_impl(Symbol* name, Symbol* signature,
                            OverpassLookupMode overpass_mode,
                            StaticLookupMode static_mode,
                            PrivateLookupMode private_mode) const;
   static Method* find_method_impl(Array<Method*>* methods,
                                   Symbol* name, Symbol* signature,
                                   OverpassLookupMode overpass_mode,
                                   StaticLookupMode static_mode,
                                   PrivateLookupMode private_mode);
   // Free CHeap allocated fields.
   void release_C_heap_structures();
 public:
   // CDS support - remove and restore oops from metadata. Oops are not shared.
   virtual void remove_unshareable_info();
   virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
   // jvm support
   jint compute_modifier_flags(TRAPS) const;
   // JSR-292 support
   MemberNameTable* member_names() { return _member_names; }
   void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
   oop add_member_name(Handle member_name, bool intern);
 public:
   // JVMTI support
   jint jvmti_class_status() const;
  public:
   // Printing
 #ifndef PRODUCT
   void print_on(outputStream* st) const;
 #endif
   void print_value_on(outputStream* st) const;
   void oop_print_value_on(oop obj, outputStream* st);
 #ifndef PRODUCT
   void oop_print_on      (oop obj, outputStream* st);
   void print_dependent_nmethods(bool verbose = false);
   bool is_dependent_nmethod(nmethod* nm);
 #endif
   const char* internal_name() const;
   // Verification
   void verify_on(outputStream* st);
   void oop_verify_on(oop obj, outputStream* st);
 };
 inline Method* InstanceKlass::method_at_vtable(int index)  {
 #ifndef PRODUCT
   assert(index >= 0, "valid vtable index");
   if (DebugVtables) {
     verify_vtable_index(index);
   }
 #endif
   vtableEntry* ve = (vtableEntry*)start_of_vtable();
   return ve[index].method();
 }
 // for adding methods
 // UNSET_IDNUM return means no more ids available
 inline u2 InstanceKlass::next_method_idnum() {
   if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
     return ConstMethod::UNSET_IDNUM; // no more ids available
   } else {
     return _idnum_allocated_count++;
   }
 }
 /* JNIid class for jfieldIDs only */
 class JNIid: public CHeapObj<mtClass> {
   friend class VMStructs;
  private:
   Klass*             _holder;
   JNIid*             _next;
   int                _offset;
 #ifdef ASSERT
   bool               _is_static_field_id;
 #endif
  public:
   // Accessors
   Klass* holder() const           { return _holder; }
   int offset() const              { return _offset; }
   JNIid* next()                   { return _next; }
   // Constructor
   JNIid(Klass* holder, int offset, JNIid* next);
   // Identifier lookup
   JNIid* find(int offset);
   bool find_local_field(fieldDescriptor* fd) {
     return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
   }
   static void deallocate(JNIid* id);
   // Debugging
 #ifdef ASSERT
   bool is_static_field_id() const { return _is_static_field_id; }
   void set_is_static_field_id()   { _is_static_field_id = true; }
 #endif
   void verify(Klass* holder);
 };
 // If breakpoints are more numerous than just JVMTI breakpoints,
 // consider compressing this data structure.
 // It is currently a simple linked list defined in method.hpp.
 class BreakpointInfo;
 // A collection point for interesting information about the previous
 // version(s) of an InstanceKlass.  A GrowableArray of PreviousVersionNodes
 // is attached to the InstanceKlass as needed. See PreviousVersionWalker below.
 class PreviousVersionNode : public CHeapObj<mtClass> {
  private:
   ConstantPool*    _prev_constant_pool;
   // If the previous version of the InstanceKlass doesn't have any
   // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
   // EMCP methods have been collected, then _prev_EMCP_methods can
   // have a length of zero.
   GrowableArray<Method*>* _prev_EMCP_methods;
 public:
   PreviousVersionNode(ConstantPool* prev_constant_pool,
                       GrowableArray<Method*>* prev_EMCP_methods);
   ~PreviousVersionNode();
   ConstantPool* prev_constant_pool() const {
     return _prev_constant_pool;
   }
   GrowableArray<Method*>* prev_EMCP_methods() const {
     return _prev_EMCP_methods;
   }
 };
 // Helper object for walking previous versions.
 class PreviousVersionWalker : public StackObj {
  private:
   Thread*                               _thread;
   GrowableArray<PreviousVersionNode *>* _previous_versions;
   int                                   _current_index;
   // A pointer to the current node object so we can handle the deletes.
   PreviousVersionNode*                  _current_p;
   // The constant pool handle keeps all the methods in this class from being
   // deallocated from the metaspace during class unloading.
   constantPoolHandle                    _current_constant_pool_handle;
  public:
   PreviousVersionWalker(Thread* thread, InstanceKlass *ik);
   // Return the interesting information for the next previous version
   // of the klass. Returns NULL if there are no more previous versions.
   PreviousVersionNode* next_previous_version();
 };
 //
 // nmethodBucket is used to record dependent nmethods for
 // deoptimization.  nmethod dependencies are actually <klass, method>
 // pairs but we really only care about the klass part for purposes of
 // finding nmethods which might need to be deoptimized.  Instead of
 // recording the method, a count of how many times a particular nmethod
 // was recorded is kept.  This ensures that any recording errors are
 // noticed since an nmethod should be removed as many times are it's
 // added.
 //
 class nmethodBucket: public CHeapObj<mtClass> {
   friend class VMStructs;
  private:
   nmethod*       _nmethod;
   int            _count;
   nmethodBucket* _next;
  public:
   nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
     _nmethod = nmethod;
     _next = next;
     _count = 1;
   }
   int count()                             { return _count; }
   int increment()                         { _count += 1; return _count; }
   int decrement();
   nmethodBucket* next()                   { return _next; }
   void set_next(nmethodBucket* b)         { _next = b; }
   nmethod* get_nmethod()                  { return _nmethod; }
 };
 // An iterator that's used to access the inner classes indices in the
 // InstanceKlass::_inner_classes array.
 class InnerClassesIterator : public StackObj {
  private:
   Array<jushort>* _inner_classes;
   int _length;
   int _idx;
  public:
   InnerClassesIterator(instanceKlassHandle k) {
     _inner_classes = k->inner_classes();
     if (k->inner_classes() != NULL) {
       _length = _inner_classes->length();
       // The inner class array's length should be the multiple of
       // inner_class_next_offset if it only contains the InnerClasses
       // attribute data, or it should be
       // n*inner_class_next_offset+enclosing_method_attribute_size
       // if it also contains the EnclosingMethod data.
       assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
               _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
              "just checking");
       // Remove the enclosing_method portion if exists.
       if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
         _length -= InstanceKlass::enclosing_method_attribute_size;
       }
     } else {
       _length = 0;
     }
     _idx = 0;
   }
   int length() const {
     return _length;
   }
   void next() {
     _idx += InstanceKlass::inner_class_next_offset;
   }
   bool done() const {
     return (_idx >= _length);
   }
   u2 inner_class_info_index() const {
     return _inner_classes->at(
                _idx + InstanceKlass::inner_class_inner_class_info_offset);
   }
   void set_inner_class_info_index(u2 index) {
     _inner_classes->at_put(
                _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
   }
   u2 outer_class_info_index() const {
     return _inner_classes->at(
                _idx + InstanceKlass::inner_class_outer_class_info_offset);
   }
   void set_outer_class_info_index(u2 index) {
     _inner_classes->at_put(
                _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
   }
   u2 inner_name_index() const {
     return _inner_classes->at(
                _idx + InstanceKlass::inner_class_inner_name_offset);
   }
   void set_inner_name_index(u2 index) {
     _inner_classes->at_put(
                _idx + InstanceKlass::inner_class_inner_name_offset, index);
   }
   u2 inner_access_flags() const {
     return _inner_classes->at(
                _idx + InstanceKlass::inner_class_access_flags_offset);
   }
 };
 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/instanceKlass.hpp@ac27a9c85bea (annotated)

src/share/vm/oops/instanceKlass.hpp