| /* |
| * 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 OopMapBlock; |
| 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 |
| |
| 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;// number of nonstatic oop-map blocks allocated at end of this klass |
| bool _is_marked_dependent; // used for marking during flushing and deoptimization |
| bool _rewritten; // methods rewritten. |
| bool _has_nonstatic_fields; // for sizing with UseCompressedOops |
| 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<PreviousVersionNode *>* _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(symbolOop& simple_name_result, TRAPS) { |
| instanceKlassHandle self(THREAD, this->as_klassOop()); |
| return compute_enclosing_class_impl(self, simple_name_result, THREAD); |
| } |
| static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
| symbolOop& simple_name_result, 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; } |
| |
| // 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 |
| int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } |
| void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; } |
| |
| // RedefineClasses() support for previous versions: |
| void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, |
| int emcp_method_count); |
| bool has_previous_version() const; |
| void init_previous_versions() { |
| _previous_versions = NULL; |
| } |
| GrowableArray<PreviousVersionNode *>* 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, size_t idnum, |
| jmethodID new_id, jmethodID* new_jmeths); |
| static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); |
| 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 |
| 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; } |
| 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++; |
| } |
| } |
| |
| |
| // ValueObjs embedded in klass. Describes where oops are located in instances of this klass. |
| |
| class OopMapBlock VALUE_OBJ_CLASS_SPEC { |
| private: |
| jushort _offset; // Offset of first oop in oop-map block |
| jushort _length; // Length of oop-map block |
| public: |
| // Accessors |
| jushort offset() const { return _offset; } |
| void set_offset(jushort offset) { _offset = offset; } |
| |
| jushort length() const { return _length; } |
| void set_length(jushort length) { _length = length; } |
| }; |
| |
| /* 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<jweak>* _prev_EMCP_methods; |
| |
| public: |
| PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
| GrowableArray<jweak>* prev_EMCP_methods); |
| ~PreviousVersionNode(); |
| jobject prev_constant_pool() const { |
| return _prev_constant_pool; |
| } |
| GrowableArray<jweak>* 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<methodHandle>* _prev_EMCP_method_handles; |
| |
| public: |
| PreviousVersionInfo(PreviousVersionNode *pv_node); |
| ~PreviousVersionInfo(); |
| constantPoolHandle prev_constant_pool_handle() const { |
| return _prev_constant_pool_handle; |
| } |
| GrowableArray<methodHandle>* 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<PreviousVersionNode *>* _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(); |
| }; |
