/* * Copyright (c) 1997, 2013, 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* _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 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 }; 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 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 Method* // Array of interesting part(s) of the previous version(s) of this // InstanceKlass. See PreviousVersionWalker below. GrowableArray* _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* _methods; // Interface (Klass*s) this class declares locally to implement. Array* _local_interfaces; // Interface (Klass*s) this class implements transitively. Array* _transitive_interfaces; // Int array containing the original order of method in the class file (for JVMTI). Array* _method_ordering; // 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* _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. // Itsef: 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* methods() const { return _methods; } void set_methods(Array* a) { _methods = a; } Method* method_with_idnum(int idnum); // method ordering Array* method_ordering() const { return _method_ordering; } void set_method_ordering(Array* m) { _method_ordering = m; } void copy_method_ordering(intArray* m, TRAPS); // interfaces Array* local_interfaces() const { return _local_interfaces; } void set_local_interfaces(Array* a) { guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); _local_interfaces = a; } Array* transitive_interfaces() const { return _transitive_interfaces; } void set_transitive_interfaces(Array* 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* fields() const { return _fields; } void set_fields(Array* f, u2 java_fields_count) { guarantee(_fields == NULL || f == NULL, "Just checking"); _fields = f; _java_fields_count = java_fields_count; } // inner classes Array* inner_classes() const { return _inner_classes; } void set_inner_classes(Array* 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; } // 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* methods, Symbol* name, Symbol* signature); // lookup operation (returns NULL if not found) Method* uncached_lookup_method(Symbol* name, Symbol* signature) 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) 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* 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 { 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* previous_versions() const { return _previous_versions; } 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; } } // 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); // cached itable index support void set_cached_itable_index(size_t idnum, int index); int cached_itable_index(size_t idnum); // 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* fields_annotations() const { return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; } AnnotationArray* class_type_annotations() const { return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; } Array* 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); // 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 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; // 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* 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*, TRAPS), 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->is_klass(), "must be"); assert(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); // Garbage collection void oop_follow_contents(oop obj); int oop_adjust_pointers(oop obj); void clean_implementors_list(BoolObjectClosure* is_alive); void clean_method_data(BoolObjectClosure* is_alive); // 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* methods); void static deallocate_interfaces(ClassLoaderData* loader_data, Klass* super_klass, Array* local_interfaces, Array* 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; } 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); } 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); } // 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. volatile oop init_lock() const; private: // 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 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, 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 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); // 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(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; } void add_member_name(int index, Handle member_name); oop get_member_name(int index); 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, bool check_dictionary); 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 { 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. 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. ConstantPool* _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(ConstantPool* prev_constant_pool, bool prev_cp_is_weak, GrowableArray* prev_EMCP_methods); ~PreviousVersionNode(); ConstantPool* 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(); }; // // nmethodBucket is used to record dependent nmethods for // deoptimization. nmethod dependencies are actually // 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 { 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() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 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* _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