/* * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // An instanceKlass is the VM level representation of a Java class. // It contains all information needed for at class at execution runtime. // instanceKlass layout: // [header ] klassOop // [klass pointer ] klassOop // [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 ] // [number of implementors ] // [implementors ] klassOop[2] // [fields ] // [constants ] // [class loader ] // [protection domain ] // [signers ] // [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 static oop fields ] size in words = static_oop_fields_size // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size // [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. // 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; // 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; }; class instanceKlass: public Klass { friend class VMStructs; public: // 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 { unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. 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 }; public: oop* oop_block_beg() const { return adr_array_klasses(); } oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } enum { implementors_limit = 2 // how many implems can we track? }; protected: // // The oop block. See comment in klass.hpp before making changes. // // Array classes holding elements of this class. klassOop _array_klasses; // Method array. objArrayOop _methods; // Int array containing the original order of method in the class file (for // JVMTI). typeArrayOop _method_ordering; // Interface (klassOops) this class declares locally to implement. objArrayOop _local_interfaces; // Interface (klassOops) this class implements transitively. objArrayOop _transitive_interfaces; // Instance and static variable information, 5-tuples of shorts [access, name // index, sig index, initval index, offset]. typeArrayOop _fields; // Constant pool for this class. constantPoolOop _constants; // Class loader used to load this class, NULL if VM loader used. oop _class_loader; // Protection domain. oop _protection_domain; // Host class, which grants its access privileges to this class also. // This is only non-null for an anonymous class (AnonymousClasses enabled). // The host class is either named, or a previously loaded anonymous class. klassOop _host_klass; // Class signers. objArrayOop _signers; // Name of source file containing this klass, NULL if not specified. symbolOop _source_file_name; // the source debug extension for this klass, NULL if not specified. symbolOop _source_debug_extension; // inner_classes attribute. typeArrayOop _inner_classes; // Implementors of this interface (not valid if it overflows) klassOop _implementors[implementors_limit]; // Generic signature, or null if none. symbolOop _generic_signature; // invokedynamic bootstrap method (a java.dyn.MethodHandle) oop _bootstrap_method; // Annotations for this class, or null if none. typeArrayOop _class_annotations; // Annotation objects (byte arrays) for fields, or null if no annotations. // Indices correspond to entries (not indices) in fields array. objArrayOop _fields_annotations; // Annotation objects (byte arrays) for methods, or null if no annotations. // Index is the idnum, which is initially the same as the methods array index. objArrayOop _methods_annotations; // Annotation objects (byte arrays) for methods' parameters, or null if no // such annotations. // Index is the idnum, which is initially the same as the methods array index. objArrayOop _methods_parameter_annotations; // Annotation objects (byte arrays) for methods' default values, or null if no // such annotations. // Index is the idnum, which is initially the same as the methods array index. objArrayOop _methods_default_annotations; // // End of the oop block. // // 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 int _static_oop_field_size;// number of static oop fields in this klass int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks bool _is_marked_dependent; // used for marking during flushing and deoptimization bool _rewritten; // methods rewritten. bool _has_nonstatic_fields; // for sizing with UseCompressedOops bool _should_verify_class; // allow caching of preverification u2 _minor_version; // minor version number of class file u2 _major_version; // major version number of class file ClassState _init_state; // state of class 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) ReferenceType _reference_type; // reference type OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 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 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 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 methodOop int _nof_implementors; // No of implementors of this interface (zero if not an interface) // Array of interesting part(s) of the previous version(s) of this // instanceKlass. See PreviousVersionWalker below. GrowableArray* _previous_versions; u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none // JVMTI fields can be moved to their own structure - see 6315920 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH jint _cached_class_file_len; // JVMTI: length of above JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change // embedded Java vtable follows here // embedded Java itables follows here // embedded static fields follows here // embedded nonstatic oop-map blocks follows here friend class instanceKlassKlass; friend class SystemDictionary; public: bool has_nonstatic_fields() const { return _has_nonstatic_fields; } void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } // 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_size() const { return _static_oop_field_size; } void set_static_oop_field_size(int size) { _static_oop_field_size = 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 klassOop array_klasses() const { return _array_klasses; } void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } // methods objArrayOop methods() const { return _methods; } void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } methodOop method_with_idnum(int idnum); // method ordering typeArrayOop method_ordering() const { return _method_ordering; } void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } // interfaces objArrayOop local_interfaces() const { return _local_interfaces; } void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } objArrayOop transitive_interfaces() const { return _transitive_interfaces; } void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } // fields // Field info extracted from the class file and stored // as an array of 7 shorts enum FieldOffset { access_flags_offset = 0, name_index_offset = 1, signature_index_offset = 2, initval_index_offset = 3, low_offset = 4, high_offset = 5, generic_signature_offset = 6, next_offset = 7 }; typeArrayOop fields() const { return _fields; } int offset_from_fields( int index ) const { return build_int_from_shorts( fields()->ushort_at(index + low_offset), fields()->ushort_at(index + high_offset) ); } void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } // inner classes typeArrayOop inner_classes() const { return _inner_classes; } void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) 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 }; // method override check bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS); // package bool is_same_class_package(klassOop class2); bool is_same_class_package(oop classloader2, symbolOop classname2); static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); // find an enclosing class (defined where original code was, in jvm.cpp!) klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { instanceKlassHandle self(THREAD, this->as_klassOop()); return compute_enclosing_class_impl(self, inner_is_member, THREAD); } static klassOop 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(klassOop class2, TRAPS) { instanceKlassHandle self(THREAD, this->as_klassOop()); return is_same_package_member_impl(self, class2, THREAD); } static bool is_same_package_member_impl(instanceKlassHandle self, klassOop 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; } int get_init_state() { return _init_state; } // Useful for debugging bool is_rewritten() const { return _rewritten; } // defineClass specified verification bool should_verify_class() const { return _should_verify_class; } void set_should_verify_class(bool value) { _should_verify_class = value; } // marking bool is_marked_dependent() const { return _is_marked_dependent; } void set_is_marked_dependent(bool value) { _is_marked_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); methodOop 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 _reference_type; } void set_reference_type(ReferenceType t) { _reference_type = t; } // find local field, returns true if found bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; // find field in direct superinterfaces, returns the interface in which the field is defined klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined klassOop find_field(symbolOop name, symbolOop 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 klassOop find_field(symbolOop name, symbolOop 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) methodOop find_method(symbolOop name, symbolOop signature) const; static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); // lookup operation (returns NULL if not found) methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; // lookup a method in all the interfaces that this class implements // (returns NULL if not found) methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; // constant pool constantPoolOop constants() const { return _constants; } void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } // class loader oop class_loader() const { return _class_loader; } void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } // protection domain oop protection_domain() { return _protection_domain; } void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } // host class oop host_klass() const { return _host_klass; } void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } bool is_anonymous() const { return _host_klass != NULL; } // signers objArrayOop signers() const { return _signers; } void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } // source file name symbolOop source_file_name() const { return _source_file_name; } void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } // 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 symbolOop source_debug_extension() const { return _source_debug_extension; } void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } // 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* previous_versions() const { return _previous_versions; } // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation void set_cached_class_file(unsigned char *class_file_bytes, jint class_file_len) { _cached_class_file_len = class_file_len; _cached_class_file_bytes = class_file_bytes; } jint get_cached_class_file_len() { return _cached_class_file_len; } unsigned char * get_cached_class_file_bytes() { return _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; } // for adding methods, constMethodOopDesc::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 symbolOop generic_signature() const { return _generic_signature; } void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } void set_enclosing_method_indices(u2 class_index, u2 method_index) { _enclosing_method_class_index = class_index; _enclosing_method_method_index = method_index; } // JSR 292 support oop bootstrap_method() const { return _bootstrap_method; } void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); } // 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(methodOop method); // cached itable index support void set_cached_itable_index(size_t idnum, int index); int cached_itable_index(size_t idnum); // annotations support typeArrayOop class_annotations() const { return _class_annotations; } objArrayOop fields_annotations() const { return _fields_annotations; } objArrayOop methods_annotations() const { return _methods_annotations; } objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } objArrayOop methods_default_annotations() const { return _methods_default_annotations; } void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } typeArrayOop get_method_annotations_of(int idnum) { return get_method_annotations_from(idnum, _methods_annotations); } typeArrayOop get_method_parameter_annotations_of(int idnum) { return get_method_annotations_from(idnum, _methods_parameter_annotations); } typeArrayOop get_method_default_annotations_of(int idnum) { return get_method_annotations_from(idnum, _methods_default_annotations); } void set_method_annotations_of(int idnum, typeArrayOop anno) { set_methods_annotations_of(idnum, anno, &_methods_annotations); } void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) { set_methods_annotations_of(idnum, anno, &_methods_annotations); } void set_method_default_annotations_of(int idnum, typeArrayOop anno) { set_methods_annotations_of(idnum, anno, &_methods_annotations); } // allocation DEFINE_ALLOCATE_PERMANENT(instanceKlass); instanceOop allocate_instance(TRAPS); instanceOop allocate_permanent_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); // 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); nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; // Breakpoint support (see methods on methodOop for details) BreakpointInfo* breakpoints() const { return _breakpoints; }; void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; // support for stub routines static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } // subclass/subinterface checks bool implements_interface(klassOop k) const; // Access to implementors of an interface. We only store the count // of implementors, and in case, there are only a few // implementors, we store them in a short list. // This accessor returns NULL if we walk off the end of the list. klassOop implementor(int i) const { return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; } int nof_implementors() const { return _nof_implementors; } void add_implementor(klassOop 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; } objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); bool compute_is_subtype_of(klassOop k); bool can_be_primary_super_slow() const; klassOop java_super() const { return super(); } int oop_size(oop obj) const { return size_helper(); } int klass_oop_size() const { return object_size(); } 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*, TRAPS), TRAPS); void methods_do(void f(methodOop method)); void array_klasses_do(void f(klassOop k)); void with_array_klasses_do(void f(klassOop k)); bool super_types_do(SuperTypeClosure* blk); // Casting from klassOop static instanceKlass* cast(klassOop k) { Klass* kp = k->klass_part(); assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); return (instanceKlass*) kp; } // Sizing (in words) static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } static int vtable_start_offset() { return header_size(); } static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } static int object_size(int extra) { return align_object_size(header_size() + extra); } intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + 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*)as_klassOop(); } // Static field offset is an offset into the Heap, should be converted by // based on UseCompressedOop for traversal HeapWord* start_of_static_fields() const { return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); } intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } int offset_of_static_fields() const { return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); } OopMapBlock* start_of_nonstatic_oop_maps() const { return (OopMapBlock*) (start_of_static_fields() + static_field_size()); } // Allocation profiling support juint alloc_size() const { return _alloc_count * size_helper(); } void set_alloc_size(juint n) {} // 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 methodOop method_at_vtable(int index); klassItable* itable() const; // return new klassItable wrapper methodOop method_at_itable(klassOop holder, int index, TRAPS); // Garbage collection void oop_follow_contents(oop obj); void follow_static_fields(); void adjust_static_fields(); int oop_adjust_pointers(oop obj); bool object_is_parsable() const { return _init_state != unparsable_by_gc; } // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. void follow_weak_klass_links( BoolObjectClosure* is_alive, OopClosure* keep_alive); void release_C_heap_structures(); // Parallel Scavenge and Parallel Old PARALLEL_GC_DECLS #ifndef SERIALGC // Parallel Scavenge void copy_static_fields(PSPromotionManager* pm); void push_static_fields(PSPromotionManager* pm); // Parallel Old void follow_static_fields(ParCompactionManager* cm); void copy_static_fields(ParCompactionManager* cm); void update_static_fields(); void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); #endif // SERIALGC // Naming const char* signature_name() const; // Iterators int oop_oop_iterate(oop obj, OopClosure* blk) { return oop_oop_iterate_v(obj, blk); } int oop_oop_iterate_m(oop obj, OopClosure* 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) #ifndef SERIALGC #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 // !SERIALGC void iterate_static_fields(OopClosure* closure); void iterate_static_fields(OopClosure* closure, MemRegion mr); private: // initialization state #ifdef ASSERT void set_init_state(ClassState state); #else void set_init_state(ClassState state) { _init_state = state; } #endif void set_rewritten() { _rewritten = true; } void set_init_thread(Thread *thread) { _init_thread = thread; } u2 idnum_allocated_count() const { return _idnum_allocated_count; } // 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); } int* methods_cached_itable_indices_acquire() const { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } void release_set_methods_cached_itable_indices(int* indices) { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); // Offsets for memory management oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} oop* adr_methods() const { return (oop*)&this->_methods;} oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} oop* adr_fields() const { return (oop*)&this->_fields;} oop* adr_constants() const { return (oop*)&this->_constants;} oop* adr_class_loader() const { return (oop*)&this->_class_loader;} oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} oop* adr_host_klass() const { return (oop*)&this->_host_klass;} oop* adr_signers() const { return (oop*)&this->_signers;} oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} oop* adr_implementors() const { return (oop*)&this->_implementors[0];} oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} // 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 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 klassOop 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, TRAPS), 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 klassOop array_klass_impl(bool or_null, int n, TRAPS); // Returns the array class with this class as element type klassOop array_klass_impl(bool or_null, TRAPS); public: // sharing support virtual void remove_unshareable_info(); void field_names_and_sigs_iterate(OopClosure* closure); // jvm support jint compute_modifier_flags(TRAPS) const; public: // JVMTI support jint jvmti_class_status() const; #ifndef PRODUCT public: // Printing void oop_print_on (oop obj, outputStream* st); void oop_print_value_on(oop obj, outputStream* st); void print_dependent_nmethods(bool verbose = false); bool is_dependent_nmethod(nmethod* nm); #endif public: // Verification const char* internal_name() const; void oop_verify_on(oop obj, outputStream* st); #ifndef PRODUCT static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; #endif }; inline methodOop 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(); } inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { if (annos == NULL || annos->length() <= idnum) { return NULL; } return typeArrayOop(annos->obj_at(idnum)); } // for adding methods // UNSET_IDNUM return means no more ids available inline u2 instanceKlass::next_method_idnum() { if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { return constMethodOopDesc::UNSET_IDNUM; // no more ids available } else { return _idnum_allocated_count++; } } /* JNIid class for jfieldIDs only */ class JNIid: public CHeapObj { friend class VMStructs; private: klassOop _holder; JNIid* _next; int _offset; #ifdef ASSERT bool _is_static_field_id; #endif public: // Accessors klassOop holder() const { return _holder; } int offset() const { return _offset; } JNIid* next() { return _next; } // Constructor JNIid(klassOop holder, int offset, JNIid* next); // Identifier lookup JNIid* find(int offset); // Garbage collection support oop* holder_addr() { return (oop*)&_holder; } void oops_do(OopClosure* f); 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(klassOop holder); }; // If breakpoints are more numerous than just JVMTI breakpoints, // consider compressing this data structure. // It is currently a simple linked list defined in methodOop.hpp. class BreakpointInfo; // A collection point for interesting information about the previous // version(s) of an instanceKlass. This class uses weak references to // the information so that the information may be collected as needed // by the system. If the information is shared, then a regular // reference must be used because a weak reference would be seen as // collectible. A GrowableArray of PreviousVersionNodes is attached // to the instanceKlass as needed. See PreviousVersionWalker below. class PreviousVersionNode : public CHeapObj { private: // A shared ConstantPool is never collected so we'll always have // a reference to it so we can update items in the cache. We'll // have a weak reference to a non-shared ConstantPool until all // of the methods (EMCP or obsolete) have been collected; the // non-shared ConstantPool becomes collectible at that point. jobject _prev_constant_pool; // regular or weak reference bool _prev_cp_is_weak; // true if not a shared ConstantPool // 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* _prev_EMCP_methods; public: PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, GrowableArray* prev_EMCP_methods); ~PreviousVersionNode(); jobject prev_constant_pool() const { return _prev_constant_pool; } GrowableArray* prev_EMCP_methods() const { return _prev_EMCP_methods; } }; // A Handle-ized version of PreviousVersionNode. class PreviousVersionInfo : public ResourceObj { private: constantPoolHandle _prev_constant_pool_handle; // If the previous version of the instanceKlass doesn't have any // EMCP methods, then _prev_EMCP_methods will be NULL. Since the // methods cannot be collected while we hold a handle, // _prev_EMCP_methods should never have a length of zero. GrowableArray* _prev_EMCP_method_handles; public: PreviousVersionInfo(PreviousVersionNode *pv_node); ~PreviousVersionInfo(); constantPoolHandle prev_constant_pool_handle() const { return _prev_constant_pool_handle; } GrowableArray* prev_EMCP_method_handles() const { return _prev_EMCP_method_handles; } }; // Helper object for walking previous versions. This helper cleans up // the Handles that it allocates when the helper object is destroyed. // The PreviousVersionInfo object returned by next_previous_version() // is only valid until a subsequent call to next_previous_version() or // the helper object is destroyed. class PreviousVersionWalker : public StackObj { private: GrowableArray* _previous_versions; int _current_index; // Fields for cleaning up when we are done walking the previous versions: // A HandleMark for the PreviousVersionInfo handles: HandleMark _hm; // It would be nice to have a ResourceMark field in this helper also, // but the ResourceMark code says to be careful to delete handles held // in GrowableArrays _before_ deleting the GrowableArray. Since we // can't guarantee the order in which the fields are destroyed, we // have to let the creator of the PreviousVersionWalker object do // the right thing. Also, adding a ResourceMark here causes an // include loop. // A pointer to the current info object so we can handle the deletes. PreviousVersionInfo * _current_p; public: PreviousVersionWalker(instanceKlass *ik); ~PreviousVersionWalker(); // Return the interesting information for the next previous version // of the klass. Returns NULL if there are no more previous versions. PreviousVersionInfo* next_previous_version(); };