graal-jvmci-8: src/share/vm/oops/klass.hpp comparison

comparison src/share/vm/oops/klass.hpp @ 6725:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

author	coleenp
date	Sat, 01 Sep 2012 13:25:18 -0400
parents	b632e80fc9dc
children	e522a00b91aa 070d523b96a7

comparison

equal deleted inserted replaced

-:36d1d483d5d6
+:da91efe96a93
 #include "memory/genOopClosures.hpp"
 #include "memory/iterator.hpp"
 #include "memory/memRegion.hpp"
 #include "memory/specialized_oop_closures.hpp"
-#include "oops/klassOop.hpp"
 #include "oops/klassPS.hpp"
+#include "oops/metadata.hpp"
 #include "oops/oop.hpp"
 #include "runtime/orderAccess.hpp"
 #include "trace/traceMacros.hpp"
 #include "utilities/accessFlags.hpp"
 #ifndef SERIALGC
 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp"
 #include "gc_implementation/g1/g1OopClosures.hpp"
 #include "gc_implementation/parNew/parOopClosures.hpp"
 #endif
-// A Klass is the part of the klassOop that provides:
+//
+// A Klass provides:
 //  1: language level class object (method dictionary etc.)
 //  2: provide vm dispatch behavior for the object
-// Both functions are combined into one C++ class. The toplevel class "Klass"
+// Both functions are combined into one C++ class.
-// implements purpose 1 whereas all subclasses provide extra virtual functions
-// for purpose 2.
 // One reason for the oop/klass dichotomy in the implementation is
 // that we don't want a C++ vtbl pointer in every object.  Thus,
 // normal oops don't have any virtual functions.  Instead, they
 // forward all "virtual" functions to their klass, which does have
 // a vtbl and does the C++ dispatch depending on the object's
 // actual type.  (See oop.inline.hpp for some of the forwarding code.)
 // ALL FUNCTIONS IMPLEMENTING THIS DISPATCH ARE PREFIXED WITH "oop_"!
 //  Klass layout:
-//    [header        ] klassOop
+//    [C++ vtbl ptr  ] (contained in Metadata)
-//    [klass pointer ] klassOop
-//    [C++ vtbl ptr  ] (contained in Klass_vtbl)
 //    [layout_helper ]
 //    [super_check_offset   ] for fast subtype checks
+//    [name          ]
 //    [secondary_super_cache] for fast subtype checks
 //    [secondary_supers     ] array of 2ndary supertypes
 //    [primary_supers 0]
 //    [primary_supers 1]
 //    [primary_supers 2]
 //    ...
 //    [primary_supers 7]
 //    [java_mirror   ]
 //    [super         ]
-//    [name          ]
+//    [subklass      ] first subclass
-//    [first subklass]
 //    [next_sibling  ] link to chain additional subklasses
+//    [next_link     ]
+//    [class_loader_data]
 //    [modifier_flags]
 //    [access_flags  ]
 //    [verify_count  ] - not in product
 //    [alloc_count   ]
 //    [last_biased_lock_bulk_revocation_time] (64 bits)
 //    [prototype_header]
 //    [biased_lock_revocation_count]
+//    [_modified_oops]
+//    [_accumulated_modified_oops]
 //    [trace_id]
 // Forward declarations.
+template <class T> class Array;
+template <class T> class GrowableArray;
+class ClassLoaderData;
 class klassVtable;
-class KlassHandle;
+class ParCompactionManager;
-class OrderAccess;
+class Klass : public Metadata {
-// Holder (or cage) for the C++ vtable of each kind of Klass.
-// We want to tightly constrain the location of the C++ vtable in the overall layout.
-class Klass_vtbl {
-protected:
-// The following virtual exists only to force creation of a C++ vtable,
-// so that this class truly is the location of the vtable of all Klasses.
-virtual void unused_initial_virtual() { }
-public:
-// The following virtual makes Klass_vtbl play a second role as a
-// factory protocol for subclasses of Klass ("sub-Klasses").
-// Here's how it works....
-//
-// This VM uses metaobjects as factories for their instances.
-//
-// In order to initialize the C++ vtable of a new instance, its
-// metaobject is forced to use the C++ placed new operator to
-// allocate the instance.  In a typical C++-based system, each
-// sub-class would have its own factory routine which
-// directly uses the placed new operator on the desired class,
-// and then calls the appropriate chain of C++ constructors.
-//
-// However, this system uses shared code to performs the first
-// allocation and initialization steps for all sub-Klasses.
-// (See base_create_klass() and base_create_array_klass().)
-// This does not factor neatly into a hierarchy of C++ constructors.
-// Each caller of these shared "base_create" routines knows
-// exactly which sub-Klass it is creating, but the shared routine
-// does not, even though it must perform the actual allocation.
-//
-// Therefore, the caller of the shared "base_create" must wrap
-// the specific placed new call in a virtual function which
-// performs the actual allocation and vtable set-up.  That
-// virtual function is here, Klass_vtbl::allocate_permanent.
-//
-// The arguments to Universe::allocate_permanent() are passed
-// straight through the placed new operator, which in turn
-// obtains them directly from this virtual call.
-//
-// This virtual is called on a temporary "example instance" of the
-// sub-Klass being instantiated, a C++ auto variable.  The "real"
-// instance created by this virtual is on the VM heap, where it is
-// equipped with a klassOopDesc header.
-//
-// It is merely an accident of implementation that we use "example
-// instances", but that is why the virtual function which implements
-// each sub-Klass factory happens to be defined by the same sub-Klass
-// for which it creates instances.
-//
-// The vtbl_value() call (see below) is used to strip away the
-// accidental Klass-ness from an "example instance" and present it as
-// a factory.  Think of each factory object as a mere container of the
-// C++ vtable for the desired sub-Klass.  Since C++ does not allow
-// direct references to vtables, the factory must also be delegated
-// the task of allocating the instance, but the essential point is
-// that the factory knows how to initialize the C++ vtable with the
-// right pointer value.  All other common initializations are handled
-// by the shared "base_create" subroutines.
-//
-virtual void* allocate_permanent(KlassHandle& klass, int size, TRAPS) const = 0;
-void post_new_init_klass(KlassHandle& klass, klassOop obj) const;
-// Every subclass on which vtbl_value is called must include this macro.
-// Delay the installation of the klassKlass pointer until after the
-// the vtable for a new klass has been installed (after the call to new()).
-#define DEFINE_ALLOCATE_PERMANENT(thisKlass)                                  \
-void* allocate_permanent(KlassHandle& klass_klass, int size, TRAPS) const { \
-void* result = new(klass_klass, size, THREAD) thisKlass();                \
-if (HAS_PENDING_EXCEPTION) return NULL;                                   \
-klassOop new_klass = ((Klass*) result)->as_klassOop();                    \
-OrderAccess::storestore();                                                \
-post_new_init_klass(klass_klass, new_klass);                              \
-return result;                                                            \
-}
-bool null_vtbl() { return *(intptr_t*)this == 0; }
-protected:
-void* operator new(size_t ignored, KlassHandle& klass, int size, TRAPS);
-};
-class Klass : public Klass_vtbl {
 friend class VMStructs;
 protected:
 // note: put frequently-used fields together at start of klass structure
 // for better cache behavior (may not make much of a difference but sure won't hurt)
 enum { _primary_super_limit = 8 };
 // The esz bits can be used directly by a SLL instruction, without masking.
 //
 // Note that the array-kind tag looks like 0x00 for instance klasses,
 // since their length in bytes is always less than 24Mb.
 //
-// Final note:  This comes first, immediately after Klass_vtbl,
+// Final note:  This comes first, immediately after C++ vtable,
 // because it is frequently queried.
 jint        _layout_helper;
 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers
 // and _primary_supers all help make fast subtype checks.  See big discussion
 // Class name.  Instance classes: java/lang/String, etc.  Array classes: [I,
 // [Ljava/lang/String;, etc.  Set to zero for all other kinds of classes.
 Symbol*     _name;
-public:
-oop* oop_block_beg() const { return adr_secondary_super_cache(); }
-oop* oop_block_end() const { return adr_next_sibling() + 1; }
-protected:
-//
-// The oop block.  All oop fields must be declared here and only oop fields
-// may be declared here.  In addition, the first and last fields in this block
-// must remain first and last, unless oop_block_beg() and/or oop_block_end()
-// are updated.  Grouping the oop fields in a single block simplifies oop
-// iteration.
-//
 // Cache of last observed secondary supertype
-klassOop    _secondary_super_cache;
+Klass*      _secondary_super_cache;
 // Array of all secondary supertypes
-objArrayOop _secondary_supers;
+Array<Klass*>* _secondary_supers;
 // Ordered list of all primary supertypes
-klassOop    _primary_supers[_primary_super_limit];
+Klass*      _primary_supers[_primary_super_limit];
 // java/lang/Class instance mirroring this class
 oop       _java_mirror;
 // Superclass
-klassOop  _super;
+Klass*      _super;
 // First subclass (NULL if none); _subklass->next_sibling() is next one
-klassOop _subklass;
+Klass*      _subklass;
 // Sibling link (or NULL); links all subklasses of a klass
-klassOop _next_sibling;
+Klass*      _next_sibling;
-//
+// All klasses loaded by a class loader are chained through these links
-// End of the oop block.
+Klass*      _next_link;
-//
+// The VM's representation of the ClassLoader used to load this class.
+// Provide access the corresponding instance java.lang.ClassLoader.
+ClassLoaderData* _class_loader_data;
 jint        _modifier_flags;  // Processed access flags, for use by Class.getModifiers.
 AccessFlags _access_flags;    // Access flags. The class/interface distinction is stored here.
 #ifndef PRODUCT
 int           _verify_count;  // to avoid redundant verifies
 #endif
-juint    _alloc_count;        // allocation profiling support - update klass_size_in_bytes() if moved/deleted
+juint    _alloc_count;        // allocation profiling support
 // Biased locking implementation and statistics
 // (the 64-bit chunk goes first, to avoid some fragmentation)
 jlong    _last_biased_lock_bulk_revocation_time;
 markOop  _prototype_header;   // Used when biased locking is both enabled and disabled for this type
 jint     _biased_lock_revocation_count;
 TRACE_DEFINE_KLASS_TRACE_ID;
-public:
+// Remembered sets support for the oops in the klasses.
-// returns the enclosing klassOop
+jbyte _modified_oops;             // Card Table Equivalent (YC/CMS support)
-klassOop as_klassOop() const {
+jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support)
-// see klassOop.hpp for layout.
-return (klassOop) (((char*) this) - sizeof(klassOopDesc));
+// Constructor
-}
+Klass();
-public:
+void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS);
-// Allocation
-const Klass_vtbl& vtbl_value() const { return *this; }  // used only on "example instances"
+public:
-static KlassHandle base_create_klass(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS);
+bool is_klass() const volatile { return true; }
-static klassOop base_create_klass_oop(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS);
 // super
-klassOop super() const               { return _super; }
+Klass* super() const               { return _super; }
-void set_super(klassOop k)           { oop_store_without_check((oop*) &_super, (oop) k); }
+void set_super(Klass* k)           { _super = k; }
 // initializes _super link, _primary_supers & _secondary_supers arrays
-void initialize_supers(klassOop k, TRAPS);
+void initialize_supers(Klass* k, TRAPS);
-void initialize_supers_impl1(klassOop k);
+void initialize_supers_impl1(Klass* k);
-void initialize_supers_impl2(klassOop k);
+void initialize_supers_impl2(Klass* k);
 // klass-specific helper for initializing _secondary_supers
-virtual objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
+virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
 // java_super is the Java-level super type as specified by Class.getSuperClass.
-virtual klassOop java_super() const  { return NULL; }
+virtual Klass* java_super() const  { return NULL; }
 juint    super_check_offset() const  { return _super_check_offset; }
 void set_super_check_offset(juint o) { _super_check_offset = o; }
-klassOop secondary_super_cache() const     { return _secondary_super_cache; }
+Klass* secondary_super_cache() const     { return _secondary_super_cache; }
-void set_secondary_super_cache(klassOop k) { oop_store_without_check((oop*) &_secondary_super_cache, (oop) k); }
+void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; }
-objArrayOop secondary_supers() const { return _secondary_supers; }
+Array<Klass*>* secondary_supers() const { return _secondary_supers; }
-void set_secondary_supers(objArrayOop k) { oop_store_without_check((oop*) &_secondary_supers, (oop) k); }
+void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; }
 // Return the element of the _super chain of the given depth.
 // If there is no such element, return either NULL or this.
-klassOop primary_super_of_depth(juint i) const {
+Klass* primary_super_of_depth(juint i) const {
 assert(i < primary_super_limit(), "oob");
-klassOop super = _primary_supers[i];
+Klass* super = _primary_supers[i];
-assert(super == NULL || super->klass_part()->super_depth() == i, "correct display");
+assert(super == NULL || super->super_depth() == i, "correct display");
 return super;
 }
 // Can this klass be a primary super?  False for interfaces and arrays of
 // interfaces.  False also for arrays or classes with long super chains.
 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit].
 juint super_depth() const {
 if (!can_be_primary_super()) {
 return primary_super_limit();
 } else {
-juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(klassOop);
+juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*);
 assert(d < primary_super_limit(), "oob");
-assert(_primary_supers[d] == as_klassOop(), "proper init");
+assert(_primary_supers[d] == this, "proper init");
 return d;
 }
 }
+// store an oop into a field of a Klass
+void klass_oop_store(oop* p, oop v);
+void klass_oop_store(volatile oop* p, oop v);
 // java mirror
 oop java_mirror() const              { return _java_mirror; }
-void set_java_mirror(oop m)          { oop_store((oop*) &_java_mirror, m); }
+void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); }
 // modifier flags
 jint modifier_flags() const          { return _modifier_flags; }
 void set_modifier_flags(jint flags)  { _modifier_flags = flags; }
 // size helper
 int layout_helper() const            { return _layout_helper; }
 void set_layout_helper(int lh)       { _layout_helper = lh; }
 // Note: for instances layout_helper() may include padding.
-// Use instanceKlass::contains_field_offset to classify field offsets.
+// Use InstanceKlass::contains_field_offset to classify field offsets.
 // sub/superklass links
-instanceKlass* superklass() const;
+InstanceKlass* superklass() const;
 Klass* subklass() const;
 Klass* next_sibling() const;
 void append_to_sibling_list();           // add newly created receiver to superklass' subklass list
 void remove_from_sibling_list();         // remove receiver from sibling list
+void set_next_link(Klass* k) { _next_link = k; }
+Klass* next_link() const { return _next_link; }   // The next klass defined by the class loader.
+// class loader data
+ClassLoaderData* class_loader_data() const               { return _class_loader_data; }
+void set_class_loader_data(ClassLoaderData* loader_data) {  _class_loader_data = loader_data; }
+// The Klasses are not placed in the Heap, so the Card Table or
+// the Mod Union Table can't be used to mark when klasses have modified oops.
+// The CT and MUT bits saves this information for the individual Klasses.
+void record_modified_oops()            { _modified_oops = 1; }
+void clear_modified_oops()             { _modified_oops = 0; }
+bool has_modified_oops()               { return _modified_oops == 1; }
+void accumulate_modified_oops()        { if (has_modified_oops()) _accumulated_modified_oops = 1; }
+void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; }
+bool has_accumulated_modified_oops()   { return _accumulated_modified_oops == 1; }
 protected:                                // internal accessors
-klassOop subklass_oop() const            { return _subklass; }
+Klass* subklass_oop() const            { return _subklass; }
-klassOop next_sibling_oop() const        { return _next_sibling; }
+Klass* next_sibling_oop() const        { return _next_sibling; }
-void     set_subklass(klassOop s);
+void     set_subklass(Klass* s);
-void     set_next_sibling(klassOop s);
+void     set_next_sibling(Klass* s);
-oop* adr_super()           const { return (oop*)&_super;             }
-oop* adr_primary_supers()  const { return (oop*)&_primary_supers[0]; }
-oop* adr_secondary_super_cache() const { return (oop*)&_secondary_super_cache; }
-oop* adr_secondary_supers()const { return (oop*)&_secondary_supers;  }
-oop* adr_java_mirror()     const { return (oop*)&_java_mirror;       }
-oop* adr_subklass()        const { return (oop*)&_subklass;          }
-oop* adr_next_sibling()    const { return (oop*)&_next_sibling;      }
 public:
 // Allocation profiling support
 juint alloc_count() const          { return _alloc_count; }
 void set_alloc_count(juint n)      { _alloc_count = n; }
 virtual juint alloc_size() const = 0;
 virtual void set_alloc_size(juint n) = 0;
 // Compiler support
-static ByteSize super_offset()                 { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _super)); }
+static ByteSize super_offset()                 { return in_ByteSize(offset_of(Klass, _super)); }
-static ByteSize super_check_offset_offset()    { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _super_check_offset)); }
+static ByteSize super_check_offset_offset()    { return in_ByteSize(offset_of(Klass, _super_check_offset)); }
-static ByteSize primary_supers_offset()        { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _primary_supers)); }
+static ByteSize primary_supers_offset()        { return in_ByteSize(offset_of(Klass, _primary_supers)); }
-static ByteSize secondary_super_cache_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _secondary_super_cache)); }
+static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); }
-static ByteSize secondary_supers_offset()      { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _secondary_supers)); }
+static ByteSize secondary_supers_offset()      { return in_ByteSize(offset_of(Klass, _secondary_supers)); }
-static ByteSize java_mirror_offset()           { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _java_mirror)); }
+static ByteSize java_mirror_offset()           { return in_ByteSize(offset_of(Klass, _java_mirror)); }
-static ByteSize modifier_flags_offset()        { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _modifier_flags)); }
+static ByteSize modifier_flags_offset()        { return in_ByteSize(offset_of(Klass, _modifier_flags)); }
-static ByteSize layout_helper_offset()         { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _layout_helper)); }
+static ByteSize layout_helper_offset()         { return in_ByteSize(offset_of(Klass, _layout_helper)); }
-static ByteSize access_flags_offset()          { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _access_flags)); }
+static ByteSize access_flags_offset()          { return in_ByteSize(offset_of(Klass, _access_flags)); }
 // Unpacking layout_helper:
 enum {
 _lh_neutral_value           = 0,  // neutral non-array non-instance value
 _lh_instance_slow_path_bit  = 0x01,
 return (lh & _lh_instance_slow_path_bit) != 0;
 }
 static bool layout_helper_is_instance(jint lh) {
 return (jint)lh > (jint)_lh_neutral_value;
 }
-static bool layout_helper_is_javaArray(jint lh) {
+static bool layout_helper_is_array(jint lh) {
 return (jint)lh < (jint)_lh_neutral_value;
 }
 static bool layout_helper_is_typeArray(jint lh) {
 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift);
 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift);
 #endif
 // vtables
 virtual klassVtable* vtable() const        { return NULL; }
-static int klass_size_in_bytes()           { return offset_of(Klass, _alloc_count) + sizeof(juint); }  // all "visible" fields
 // subclass check
-bool is_subclass_of(klassOop k) const;
+bool is_subclass_of(Klass* k) const;
 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it
-bool is_subtype_of(klassOop k) const {
+bool is_subtype_of(Klass* k) const {
-juint    off = k->klass_part()->super_check_offset();
+juint    off = k->super_check_offset();
-klassOop sup = *(klassOop*)( (address)as_klassOop() + off );
+Klass* sup = *(Klass**)( (address)this + off );
 const juint secondary_offset = in_bytes(secondary_super_cache_offset());
 if (sup == k) {
 return true;
 } else if (off != secondary_offset) {
 return false;
 } else {
 return search_secondary_supers(k);
 }
 }
-bool search_secondary_supers(klassOop k) const;
+bool search_secondary_supers(Klass* k) const;
 // Find LCA in class hierarchy
 Klass *LCA( Klass *k );
 // 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);
 // Casting
-static Klass* cast(klassOop k) {
+static Klass* cast(Klass* k) {
 assert(k->is_klass(), "cast to Klass");
-return k->klass_part();
+return k;
 }
 // array copying
 virtual void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
 virtual bool should_be_initialized() const    { return false; }
 // initializes the klass
 virtual void initialize(TRAPS);
 // lookup operation for MethodLookupCache
 friend class MethodLookupCache;
-virtual methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const;
+virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
 public:
-methodOop lookup_method(Symbol* name, Symbol* signature) const {
+Method* lookup_method(Symbol* name, Symbol* signature) const {
 return uncached_lookup_method(name, signature);
 }
 // array class with specific rank
-klassOop array_klass(int rank, TRAPS)         {  return array_klass_impl(false, rank, THREAD); }
+Klass* array_klass(int rank, TRAPS)         {  return array_klass_impl(false, rank, THREAD); }
 // array class with this klass as element type
-klassOop array_klass(TRAPS)                   {  return array_klass_impl(false, THREAD); }
+Klass* array_klass(TRAPS)                   {  return array_klass_impl(false, THREAD); }
 // These will return NULL instead of allocating on the heap:
 // NB: these can block for a mutex, like other functions with TRAPS arg.
-klassOop array_klass_or_null(int rank);
+Klass* array_klass_or_null(int rank);
-klassOop array_klass_or_null();
+Klass* array_klass_or_null();
 virtual oop protection_domain()       { return NULL; }
-virtual oop class_loader()  const     { return NULL; }
+oop class_loader() const;
 protected:
-virtual klassOop array_klass_impl(bool or_null, int rank, TRAPS);
+virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS);
-virtual klassOop array_klass_impl(bool or_null, TRAPS);
+virtual Klass* array_klass_impl(bool or_null, TRAPS);
 public:
+// CDS support - remove and restore oops from metadata. Oops are not shared.
 virtual void remove_unshareable_info();
-virtual void shared_symbols_iterate(SymbolClosure* closure);
+virtual void restore_unshareable_info(TRAPS);
 protected:
 // computes the subtype relationship
-virtual bool compute_is_subtype_of(klassOop k);
+virtual bool compute_is_subtype_of(Klass* k);
 public:
 // subclass accessor (here for convenience; undefined for non-klass objects)
 virtual bool is_leaf_class() const { fatal("not a class"); return false; }
 public:
 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP
 // These functions describe behavior for the oop not the KLASS.
 // actual oop size of obj in memory
 virtual int oop_size(oop obj) const = 0;
-// actual oop size of this klass in memory
+// Size of klass in word size.
-virtual int klass_oop_size() const = 0;
+virtual int size() const = 0;
 // Returns the Java name for a class (Resource allocated)
 // For arrays, this returns the name of the element with a leading '['.
 // For classes, this returns the name with the package separators
 //     turned into '.'s.
 virtual int  oop_adjust_pointers(oop obj) = 0;
 // Parallel Scavenge and Parallel Old
 PARALLEL_GC_DECLS_PV
-public:
 // type testing operations
+protected:
 virtual bool oop_is_instance_slow()       const { return false; }
+virtual bool oop_is_array_slow()          const { return false; }
+virtual bool oop_is_objArray_slow()       const { return false; }
+virtual bool oop_is_typeArray_slow()      const { return false; }
+public:
 virtual bool oop_is_instanceMirror()      const { return false; }
 virtual bool oop_is_instanceRef()         const { return false; }
-virtual bool oop_is_array()               const { return false; }
-virtual bool oop_is_objArray_slow()       const { return false; }
+// Fast non-virtual versions
-virtual bool oop_is_klass()               const { return false; }
-virtual bool oop_is_thread()              const { return false; }
-virtual bool oop_is_method()              const { return false; }
-virtual bool oop_is_constMethod()         const { return false; }
-virtual bool oop_is_methodData()          const { return false; }
-virtual bool oop_is_constantPool()        const { return false; }
-virtual bool oop_is_constantPoolCache()   const { return false; }
-virtual bool oop_is_typeArray_slow()      const { return false; }
-virtual bool oop_is_arrayKlass()          const { return false; }
-virtual bool oop_is_objArrayKlass()       const { return false; }
-virtual bool oop_is_typeArrayKlass()      const { return false; }
-virtual bool oop_is_compiledICHolder()    const { return false; }
-virtual bool oop_is_instanceKlass()       const { return false; }
-bool oop_is_javaArray_slow() const {
-return oop_is_objArray_slow() || oop_is_typeArray_slow();
-}
-// Fast non-virtual versions, used by oop.inline.hpp and elsewhere:
 #ifndef ASSERT
 #define assert_same_query(xval, xcheck) xval
 #else
 private:
 static bool assert_same_query(bool xval, bool xslow) {
 public:
 #endif
 inline  bool oop_is_instance()            const { return assert_same_query(
 layout_helper_is_instance(layout_helper()),
 oop_is_instance_slow()); }
-inline  bool oop_is_javaArray()           const { return assert_same_query(
+inline  bool oop_is_array()               const { return assert_same_query(
-layout_helper_is_javaArray(layout_helper()),
+layout_helper_is_array(layout_helper()),
-oop_is_javaArray_slow()); }
+oop_is_array_slow()); }
 inline  bool oop_is_objArray()            const { return assert_same_query(
 layout_helper_is_objArray(layout_helper()),
 oop_is_objArray_slow()); }
 inline  bool oop_is_typeArray()           const { return assert_same_query(
 layout_helper_is_typeArray(layout_helper()),
 oop_is_typeArray_slow()); }
 #undef assert_same_query
-// Unless overridden, oop is parsable if it has a klass pointer.
-// Parsability of an object is object specific.
-virtual bool oop_is_parsable(oop obj) const { return true; }
-// Unless overridden, oop is safe for concurrent GC processing
-// after its allocation is complete.  The exception to
-// this is the case where objects are changed after allocation.
-// Class redefinition is one of the known exceptions. During
-// class redefinition, an allocated class can changed in order
-// order to create a merged class (the combiniation of the
-// old class definition that has to be perserved and the new class
-// definition which is being created.
-virtual bool oop_is_conc_safe(oop obj) const { return true; }
 // Access flags
 AccessFlags access_flags() const         { return _access_flags;  }
 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
 // reason why it could not be done for arrayKlasses aside from
 // wanting to reduce the initial scope of this optimization. There
 // are potential problems in setting the bias pattern for
 // JVM-internal oops.
 inline void set_prototype_header(markOop header);
-static ByteSize prototype_header_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _prototype_header)); }
+static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); }
 int  biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; }
 // Atomically increments biased_lock_revocation_count and returns updated value
 int atomic_incr_biased_lock_revocation_count();
 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; }
 void  set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; }
 TRACE_DEFINE_KLASS_METHODS;
 // garbage collection support
-virtual void follow_weak_klass_links(
+virtual void oops_do(OopClosure* cl);
-BoolObjectClosure* is_alive, OopClosure* keep_alive);
+// Checks if the class loader is alive.
+// Iff the class loader is alive the Klass is considered alive.
+// The is_alive closure passed in depends on the Garbage Collector used.
+bool is_loader_alive(BoolObjectClosure* is_alive);
+static void clean_weak_klass_links(BoolObjectClosure* is_alive);
 // Prefetch within oop iterators.  This is a macro because we
 // can't guarantee that the compiler will inline it.  In 64-bit
 // it generally doesn't.  Signature is
 //
 }                                                  \
 }                                                    \
 }
 // iterators
-virtual int oop_oop_iterate(oop obj, OopClosure* blk) = 0;
+virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0;
-virtual int oop_oop_iterate_v(oop obj, OopClosure* blk) {
+virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) {
 return oop_oop_iterate(obj, blk);
 }
 #ifndef SERIALGC
 // In case we don't have a specialized backward scanner use forward
 // iteration.
-virtual int oop_oop_iterate_backwards_v(oop obj, OopClosure* blk) {
+virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) {
 return oop_oop_iterate_v(obj, blk);
 }
 #endif // !SERIALGC
 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr".
 // (I don't see why the _m should be required, but without it the Solaris
 // C++ gives warning messages about overridings of the "oop_oop_iterate"
 // defined above "hiding" this virtual function.  (DLD, 6/20/00)) */
-virtual int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) = 0;
+virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0;
-virtual int oop_oop_iterate_v_m(oop obj, OopClosure* blk, MemRegion mr) {
+virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
 return oop_oop_iterate_m(obj, blk, mr);
 }
 // Versions of the above iterators specialized to particular subtypes
 // of OopClosure, to avoid closure virtual calls.
 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL)
 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL)
 #endif // !SERIALGC
-virtual void array_klasses_do(void f(klassOop k)) {}
+virtual void array_klasses_do(void f(Klass* k)) {}
-virtual void with_array_klasses_do(void f(klassOop k));
+virtual void with_array_klasses_do(void f(Klass* k));
 // Return self, except for abstract classes with exactly 1
 // implementor.  Then return the 1 concrete implementation.
 Klass *up_cast_abstract();
 // klass name
 Symbol* name() const                   { return _name; }
 void set_name(Symbol* n);
-friend class klassKlass;
 public:
 // jvm support
 virtual jint compute_modifier_flags(TRAPS) const;
 // JVMTI support
 virtual jint jvmti_class_status() const;
 // Printing
+virtual void print_on(outputStream* st) const;
 virtual void oop_print_value_on(oop obj, outputStream* st);
 virtual void oop_print_on      (oop obj, outputStream* st);
+virtual const char* internal_name() const = 0;
 // Verification
-virtual const char* internal_name() const = 0;
+virtual void verify_on(outputStream* st);
-virtual void oop_verify_on(oop obj, outputStream* st);
+void verify() { verify_on(tty); }
-// tells whether obj is partially constructed (gc during class loading)
-virtual bool oop_partially_loaded(oop obj) const { return false; }
-virtual void oop_set_partially_loaded(oop obj) {};
 #ifndef PRODUCT
 void verify_vtable_index(int index);
 #endif
+virtual void oop_verify_on(oop obj, outputStream* st);
+private:
+// barriers used by klass_oop_store
+void klass_update_barrier_set(oop v);
+void klass_update_barrier_set_pre(void* p, oop v);
 };
-inline oop klassOopDesc::java_mirror() const                        { return klass_part()->java_mirror(); }
 #endif // SHARE_VM_OOPS_KLASS_HPP

Mercurial > hg > graal-jvmci-8

comparison src/share/vm/oops/klass.hpp @ 6725:da91efe96a93