duke@435: /* stefank@2534: * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: stefank@2314: #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP stefank@2314: #define SHARE_VM_OOPS_INSTANCEKLASS_HPP stefank@2314: stefank@2314: #include "oops/constMethodOop.hpp" stefank@2314: #include "oops/constantPoolOop.hpp" stefank@2314: #include "oops/instanceOop.hpp" stefank@2314: #include "oops/klassOop.hpp" stefank@2314: #include "oops/klassVtable.hpp" stefank@2314: #include "oops/objArrayOop.hpp" stefank@2314: #include "runtime/handles.hpp" stefank@2314: #include "runtime/os.hpp" stefank@2314: #include "utilities/accessFlags.hpp" stefank@2314: #include "utilities/bitMap.inline.hpp" stefank@2314: duke@435: // An instanceKlass is the VM level representation of a Java class. duke@435: // It contains all information needed for at class at execution runtime. duke@435: duke@435: // instanceKlass layout: duke@435: // [header ] klassOop duke@435: // [klass pointer ] klassOop duke@435: // [C++ vtbl pointer ] Klass duke@435: // [subtype cache ] Klass duke@435: // [instance size ] Klass duke@435: // [java mirror ] Klass duke@435: // [super ] Klass duke@435: // [access_flags ] Klass duke@435: // [name ] Klass duke@435: // [first subklass ] Klass duke@435: // [next sibling ] Klass duke@435: // [array klasses ] duke@435: // [methods ] duke@435: // [local interfaces ] duke@435: // [transitive interfaces ] duke@435: // [number of implementors ] duke@435: // [implementors ] klassOop[2] duke@435: // [fields ] duke@435: // [constants ] duke@435: // [class loader ] duke@435: // [protection domain ] duke@435: // [signers ] duke@435: // [source file name ] duke@435: // [inner classes ] duke@435: // [static field size ] duke@435: // [nonstatic field size ] duke@435: // [static oop fields size ] duke@435: // [nonstatic oop maps size ] duke@435: // [has finalize method ] duke@435: // [deoptimization mark bit ] duke@435: // [initialization state ] duke@435: // [initializing thread ] duke@435: // [Java vtable length ] duke@435: // [oop map cache (stack maps) ] duke@435: // [EMBEDDED Java vtable ] size in words = vtable_len duke@435: // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size duke@435: // duke@435: // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating duke@435: // where oops are located in instances of this klass. duke@435: duke@435: duke@435: // forward declaration for class -- see below for definition duke@435: class SuperTypeClosure; duke@435: class JNIid; duke@435: class jniIdMapBase; duke@435: class BreakpointInfo; duke@435: class fieldDescriptor; duke@435: class DepChange; duke@435: class nmethodBucket; duke@435: class PreviousVersionNode; duke@435: class JvmtiCachedClassFieldMap; duke@435: duke@435: // This is used in iterators below. duke@435: class FieldClosure: public StackObj { duke@435: public: duke@435: virtual void do_field(fieldDescriptor* fd) = 0; duke@435: }; duke@435: duke@435: #ifndef PRODUCT duke@435: // Print fields. duke@435: // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. duke@435: class FieldPrinter: public FieldClosure { duke@435: oop _obj; duke@435: outputStream* _st; duke@435: public: duke@435: FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} duke@435: void do_field(fieldDescriptor* fd); duke@435: }; duke@435: #endif // !PRODUCT duke@435: jcoomes@1373: // ValueObjs embedded in klass. Describes where oops are located in instances of jcoomes@1373: // this klass. jcoomes@1373: class OopMapBlock VALUE_OBJ_CLASS_SPEC { jcoomes@1373: public: jcoomes@1373: // Byte offset of the first oop mapped by this block. jcoomes@1374: int offset() const { return _offset; } jcoomes@1374: void set_offset(int offset) { _offset = offset; } jcoomes@1373: jcoomes@1373: // Number of oops in this block. jcoomes@1374: uint count() const { return _count; } jcoomes@1374: void set_count(uint count) { _count = count; } jcoomes@1373: jcoomes@1373: // sizeof(OopMapBlock) in HeapWords. jcoomes@1373: static const int size_in_words() { jcoomes@1373: return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> jcoomes@1373: LogHeapWordSize; jcoomes@1373: } jcoomes@1373: jcoomes@1373: private: jcoomes@1374: int _offset; jcoomes@1374: uint _count; jcoomes@1373: }; jcoomes@1373: duke@435: class instanceKlass: public Klass { duke@435: friend class VMStructs; duke@435: public: duke@435: // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description duke@435: // of the class loading & initialization procedure, and the use of the states. duke@435: enum ClassState { duke@435: unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. duke@435: allocated, // allocated (but not yet linked) duke@435: loaded, // loaded and inserted in class hierarchy (but not linked yet) duke@435: linked, // successfully linked/verified (but not initialized yet) duke@435: being_initialized, // currently running class initializer duke@435: fully_initialized, // initialized (successfull final state) duke@435: initialization_error // error happened during initialization duke@435: }; duke@435: duke@435: public: duke@435: oop* oop_block_beg() const { return adr_array_klasses(); } duke@435: oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } duke@435: duke@435: enum { duke@435: implementors_limit = 2 // how many implems can we track? duke@435: }; duke@435: duke@435: protected: duke@435: // duke@435: // The oop block. See comment in klass.hpp before making changes. duke@435: // duke@435: duke@435: // Array classes holding elements of this class. duke@435: klassOop _array_klasses; duke@435: // Method array. duke@435: objArrayOop _methods; duke@435: // Int array containing the original order of method in the class file (for duke@435: // JVMTI). duke@435: typeArrayOop _method_ordering; duke@435: // Interface (klassOops) this class declares locally to implement. duke@435: objArrayOop _local_interfaces; duke@435: // Interface (klassOops) this class implements transitively. duke@435: objArrayOop _transitive_interfaces; duke@435: // Instance and static variable information, 5-tuples of shorts [access, name duke@435: // index, sig index, initval index, offset]. duke@435: typeArrayOop _fields; duke@435: // Constant pool for this class. duke@435: constantPoolOop _constants; duke@435: // Class loader used to load this class, NULL if VM loader used. duke@435: oop _class_loader; duke@435: // Protection domain. duke@435: oop _protection_domain; jrose@866: // Host class, which grants its access privileges to this class also. jrose@866: // This is only non-null for an anonymous class (AnonymousClasses enabled). jrose@866: // The host class is either named, or a previously loaded anonymous class. jrose@866: klassOop _host_klass; duke@435: // Class signers. duke@435: objArrayOop _signers; duke@435: // inner_classes attribute. duke@435: typeArrayOop _inner_classes; duke@435: // Implementors of this interface (not valid if it overflows) duke@435: klassOop _implementors[implementors_limit]; jrose@2639: // invokedynamic bootstrap method (a java.lang.invoke.MethodHandle) jrose@2638: oop _bootstrap_method; // AllowTransitionalJSR292 ONLY duke@435: // Annotations for this class, or null if none. duke@435: typeArrayOop _class_annotations; duke@435: // Annotation objects (byte arrays) for fields, or null if no annotations. duke@435: // Indices correspond to entries (not indices) in fields array. duke@435: objArrayOop _fields_annotations; duke@435: // Annotation objects (byte arrays) for methods, or null if no annotations. duke@435: // Index is the idnum, which is initially the same as the methods array index. duke@435: objArrayOop _methods_annotations; duke@435: // Annotation objects (byte arrays) for methods' parameters, or null if no duke@435: // such annotations. duke@435: // Index is the idnum, which is initially the same as the methods array index. duke@435: objArrayOop _methods_parameter_annotations; duke@435: // Annotation objects (byte arrays) for methods' default values, or null if no duke@435: // such annotations. duke@435: // Index is the idnum, which is initially the same as the methods array index. duke@435: objArrayOop _methods_default_annotations; duke@435: duke@435: // duke@435: // End of the oop block. duke@435: // duke@435: coleenp@2497: // Name of source file containing this klass, NULL if not specified. coleenp@2497: Symbol* _source_file_name; coleenp@2497: // the source debug extension for this klass, NULL if not specified. coleenp@2497: Symbol* _source_debug_extension; coleenp@2497: // Generic signature, or null if none. coleenp@2497: Symbol* _generic_signature; coleenp@2497: // Array name derived from this class which needs unreferencing coleenp@2497: // if this class is unloaded. coleenp@2497: Symbol* _array_name; coleenp@2497: kvn@600: // Number of heapOopSize words used by non-static fields in this klass kvn@600: // (including inherited fields but after header_size()). coleenp@548: int _nonstatic_field_size; coleenp@548: int _static_field_size; // number words used by static fields (oop and non-oop) in this klass never@2658: int _static_oop_field_count;// number of static oop fields in this klass jcoomes@1373: int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks acorn@1410: bool _is_marked_dependent; // used for marking during flushing and deoptimization acorn@1410: bool _rewritten; // methods rewritten. acorn@1410: bool _has_nonstatic_fields; // for sizing with UseCompressedOops acorn@1410: bool _should_verify_class; // allow caching of preverification duke@435: u2 _minor_version; // minor version number of class file duke@435: u2 _major_version; // major version number of class file duke@435: ClassState _init_state; // state of class duke@435: Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) duke@435: int _vtable_len; // length of Java vtable (in words) duke@435: int _itable_len; // length of Java itable (in words) duke@435: ReferenceType _reference_type; // reference type duke@435: OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) duke@435: JNIid* _jni_ids; // First JNI identifier for static fields in this class duke@435: jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none duke@435: int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL duke@435: nmethodBucket* _dependencies; // list of dependent nmethods duke@435: nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class duke@435: BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop duke@435: int _nof_implementors; // No of implementors of this interface (zero if not an interface) duke@435: // Array of interesting part(s) of the previous version(s) of this duke@435: // instanceKlass. See PreviousVersionWalker below. duke@435: GrowableArray* _previous_versions; duke@435: u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none duke@435: u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none duke@435: // JVMTI fields can be moved to their own structure - see 6315920 duke@435: unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH duke@435: jint _cached_class_file_len; // JVMTI: length of above duke@435: JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration duke@435: volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change duke@435: duke@435: // embedded Java vtable follows here duke@435: // embedded Java itables follows here duke@435: // embedded static fields follows here duke@435: // embedded nonstatic oop-map blocks follows here duke@435: duke@435: friend class instanceKlassKlass; duke@435: friend class SystemDictionary; duke@435: duke@435: public: acorn@1410: bool has_nonstatic_fields() const { return _has_nonstatic_fields; } acorn@1410: void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } coleenp@548: duke@435: // field sizes duke@435: int nonstatic_field_size() const { return _nonstatic_field_size; } duke@435: void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } duke@435: duke@435: int static_field_size() const { return _static_field_size; } duke@435: void set_static_field_size(int size) { _static_field_size = size; } duke@435: never@2658: int static_oop_field_count() const { return _static_oop_field_count; } never@2658: void set_static_oop_field_count(int size) { _static_oop_field_count = size; } duke@435: duke@435: // Java vtable duke@435: int vtable_length() const { return _vtable_len; } duke@435: void set_vtable_length(int len) { _vtable_len = len; } duke@435: duke@435: // Java itable duke@435: int itable_length() const { return _itable_len; } duke@435: void set_itable_length(int len) { _itable_len = len; } duke@435: duke@435: // array klasses duke@435: klassOop array_klasses() const { return _array_klasses; } duke@435: void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } duke@435: duke@435: // methods duke@435: objArrayOop methods() const { return _methods; } duke@435: void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } duke@435: methodOop method_with_idnum(int idnum); duke@435: duke@435: // method ordering duke@435: typeArrayOop method_ordering() const { return _method_ordering; } duke@435: void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } duke@435: duke@435: // interfaces duke@435: objArrayOop local_interfaces() const { return _local_interfaces; } duke@435: void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } duke@435: objArrayOop transitive_interfaces() const { return _transitive_interfaces; } duke@435: void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } duke@435: duke@435: // fields duke@435: // Field info extracted from the class file and stored duke@435: // as an array of 7 shorts duke@435: enum FieldOffset { duke@435: access_flags_offset = 0, duke@435: name_index_offset = 1, duke@435: signature_index_offset = 2, duke@435: initval_index_offset = 3, duke@435: low_offset = 4, duke@435: high_offset = 5, duke@435: generic_signature_offset = 6, duke@435: next_offset = 7 duke@435: }; duke@435: duke@435: typeArrayOop fields() const { return _fields; } duke@435: int offset_from_fields( int index ) const { duke@435: return build_int_from_shorts( fields()->ushort_at(index + low_offset), duke@435: fields()->ushort_at(index + high_offset) ); duke@435: } duke@435: duke@435: void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } duke@435: duke@435: // inner classes duke@435: typeArrayOop inner_classes() const { return _inner_classes; } duke@435: void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } duke@435: duke@435: enum InnerClassAttributeOffset { duke@435: // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 duke@435: inner_class_inner_class_info_offset = 0, duke@435: inner_class_outer_class_info_offset = 1, duke@435: inner_class_inner_name_offset = 2, duke@435: inner_class_access_flags_offset = 3, duke@435: inner_class_next_offset = 4 duke@435: }; duke@435: acorn@1087: // method override check coleenp@2497: bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); acorn@1087: duke@435: // package duke@435: bool is_same_class_package(klassOop class2); coleenp@2497: bool is_same_class_package(oop classloader2, Symbol* classname2); coleenp@2497: static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); duke@435: jrose@1100: // find an enclosing class (defined where original code was, in jvm.cpp!) xlu@1561: klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { jrose@1100: instanceKlassHandle self(THREAD, this->as_klassOop()); xlu@1561: return compute_enclosing_class_impl(self, inner_is_member, THREAD); jrose@1100: } jrose@1100: static klassOop compute_enclosing_class_impl(instanceKlassHandle self, xlu@1561: bool* inner_is_member, TRAPS); jrose@1100: jrose@1100: // tell if two classes have the same enclosing class (at package level) jrose@1100: bool is_same_package_member(klassOop class2, TRAPS) { jrose@1100: instanceKlassHandle self(THREAD, this->as_klassOop()); jrose@1100: return is_same_package_member_impl(self, class2, THREAD); jrose@1100: } jrose@1100: static bool is_same_package_member_impl(instanceKlassHandle self, jrose@1100: klassOop class2, TRAPS); jrose@1100: duke@435: // initialization state duke@435: bool is_loaded() const { return _init_state >= loaded; } duke@435: bool is_linked() const { return _init_state >= linked; } duke@435: bool is_initialized() const { return _init_state == fully_initialized; } duke@435: bool is_not_initialized() const { return _init_state < being_initialized; } duke@435: bool is_being_initialized() const { return _init_state == being_initialized; } duke@435: bool is_in_error_state() const { return _init_state == initialization_error; } duke@435: bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } duke@435: int get_init_state() { return _init_state; } // Useful for debugging acorn@1410: bool is_rewritten() const { return _rewritten; } acorn@1408: acorn@1408: // defineClass specified verification acorn@1410: bool should_verify_class() const { return _should_verify_class; } acorn@1410: void set_should_verify_class(bool value) { _should_verify_class = value; } duke@435: duke@435: // marking acorn@1410: bool is_marked_dependent() const { return _is_marked_dependent; } acorn@1410: void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } duke@435: duke@435: // initialization (virtuals from Klass) duke@435: bool should_be_initialized() const; // means that initialize should be called duke@435: void initialize(TRAPS); duke@435: void link_class(TRAPS); duke@435: bool link_class_or_fail(TRAPS); // returns false on failure duke@435: void unlink_class(); duke@435: void rewrite_class(TRAPS); duke@435: methodOop class_initializer(); duke@435: duke@435: // set the class to initialized if no static initializer is present duke@435: void eager_initialize(Thread *thread); duke@435: duke@435: // reference type duke@435: ReferenceType reference_type() const { return _reference_type; } duke@435: void set_reference_type(ReferenceType t) { _reference_type = t; } duke@435: johnc@2781: static int reference_type_offset_in_bytes() { return offset_of(instanceKlass, _reference_type); } johnc@2781: duke@435: // find local field, returns true if found coleenp@2497: bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; duke@435: // find field in direct superinterfaces, returns the interface in which the field is defined coleenp@2497: klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; duke@435: // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined coleenp@2497: klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; duke@435: // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined coleenp@2497: klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; duke@435: duke@435: // find a non-static or static field given its offset within the class. duke@435: bool contains_field_offset(int offset) { coleenp@548: return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); duke@435: } duke@435: duke@435: bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; duke@435: bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; duke@435: duke@435: // find a local method (returns NULL if not found) coleenp@2497: methodOop find_method(Symbol* name, Symbol* signature) const; coleenp@2497: static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); duke@435: duke@435: // lookup operation (returns NULL if not found) coleenp@2497: methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; duke@435: duke@435: // lookup a method in all the interfaces that this class implements duke@435: // (returns NULL if not found) coleenp@2497: methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; duke@435: duke@435: // constant pool duke@435: constantPoolOop constants() const { return _constants; } duke@435: void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } duke@435: duke@435: // class loader duke@435: oop class_loader() const { return _class_loader; } duke@435: void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } duke@435: duke@435: // protection domain duke@435: oop protection_domain() { return _protection_domain; } duke@435: void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } duke@435: jrose@866: // host class jrose@866: oop host_klass() const { return _host_klass; } jrose@866: void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } jrose@866: bool is_anonymous() const { return _host_klass != NULL; } jrose@866: duke@435: // signers duke@435: objArrayOop signers() const { return _signers; } duke@435: void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } duke@435: duke@435: // source file name coleenp@2497: Symbol* source_file_name() const { return _source_file_name; } coleenp@2497: void set_source_file_name(Symbol* n); duke@435: duke@435: // minor and major version numbers of class file duke@435: u2 minor_version() const { return _minor_version; } duke@435: void set_minor_version(u2 minor_version) { _minor_version = minor_version; } duke@435: u2 major_version() const { return _major_version; } duke@435: void set_major_version(u2 major_version) { _major_version = major_version; } duke@435: duke@435: // source debug extension coleenp@2497: Symbol* source_debug_extension() const { return _source_debug_extension; } coleenp@2497: void set_source_debug_extension(Symbol* n); coleenp@2497: coleenp@2497: // symbol unloading support (refcount already added) coleenp@2497: Symbol* array_name() { return _array_name; } coleenp@2497: void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } duke@435: duke@435: // nonstatic oop-map blocks jcoomes@1374: static int nonstatic_oop_map_size(unsigned int oop_map_count) { jcoomes@1373: return oop_map_count * OopMapBlock::size_in_words(); jcoomes@1373: } jcoomes@1374: unsigned int nonstatic_oop_map_count() const { jcoomes@1373: return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); jcoomes@1373: } jcoomes@1373: int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } jcoomes@1373: void set_nonstatic_oop_map_size(int words) { jcoomes@1373: _nonstatic_oop_map_size = words; jcoomes@1373: } duke@435: duke@435: // RedefineClasses() support for previous versions: duke@435: void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, duke@435: int emcp_method_count); dcubed@1412: // If the _previous_versions array is non-NULL, then this klass dcubed@1412: // has been redefined at least once even if we aren't currently dcubed@1412: // tracking a previous version. dcubed@1412: bool has_been_redefined() const { return _previous_versions != NULL; } duke@435: bool has_previous_version() const; duke@435: void init_previous_versions() { duke@435: _previous_versions = NULL; duke@435: } duke@435: GrowableArray* previous_versions() const { duke@435: return _previous_versions; duke@435: } duke@435: duke@435: // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation duke@435: void set_cached_class_file(unsigned char *class_file_bytes, duke@435: jint class_file_len) { _cached_class_file_len = class_file_len; duke@435: _cached_class_file_bytes = class_file_bytes; } duke@435: jint get_cached_class_file_len() { return _cached_class_file_len; } duke@435: unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } duke@435: duke@435: // JVMTI: Support for caching of field indices, types, and offsets duke@435: void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { duke@435: _jvmti_cached_class_field_map = descriptor; duke@435: } duke@435: JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { duke@435: return _jvmti_cached_class_field_map; duke@435: } duke@435: duke@435: // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available duke@435: inline u2 next_method_idnum(); duke@435: void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } duke@435: duke@435: // generics support coleenp@2497: Symbol* generic_signature() const { return _generic_signature; } coleenp@2497: void set_generic_signature(Symbol* sig) { _generic_signature = sig; } coleenp@2497: duke@435: u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } duke@435: u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } duke@435: void set_enclosing_method_indices(u2 class_index, duke@435: u2 method_index) { _enclosing_method_class_index = class_index; duke@435: _enclosing_method_method_index = method_index; } duke@435: jrose@1161: // JSR 292 support jrose@2638: oop bootstrap_method() const { return _bootstrap_method; } // AllowTransitionalJSR292 ONLY jrose@1161: void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); } jrose@1161: duke@435: // jmethodID support dcubed@1412: static jmethodID get_jmethod_id(instanceKlassHandle ik_h, dcubed@1412: methodHandle method_h); dcubed@1412: static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, dcubed@1412: size_t idnum, jmethodID new_id, jmethodID* new_jmeths, dcubed@1412: jmethodID* to_dealloc_id_p, dcubed@1412: jmethodID** to_dealloc_jmeths_p); dcubed@1412: static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, dcubed@1412: size_t *length_p, jmethodID* id_p); duke@435: jmethodID jmethod_id_or_null(methodOop method); duke@435: duke@435: // cached itable index support duke@435: void set_cached_itable_index(size_t idnum, int index); duke@435: int cached_itable_index(size_t idnum); duke@435: duke@435: // annotations support duke@435: typeArrayOop class_annotations() const { return _class_annotations; } duke@435: objArrayOop fields_annotations() const { return _fields_annotations; } duke@435: objArrayOop methods_annotations() const { return _methods_annotations; } duke@435: objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } duke@435: objArrayOop methods_default_annotations() const { return _methods_default_annotations; } duke@435: void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } duke@435: void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } duke@435: void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } duke@435: void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } duke@435: void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } duke@435: typeArrayOop get_method_annotations_of(int idnum) duke@435: { return get_method_annotations_from(idnum, _methods_annotations); } duke@435: typeArrayOop get_method_parameter_annotations_of(int idnum) duke@435: { return get_method_annotations_from(idnum, _methods_parameter_annotations); } duke@435: typeArrayOop get_method_default_annotations_of(int idnum) duke@435: { return get_method_annotations_from(idnum, _methods_default_annotations); } duke@435: void set_method_annotations_of(int idnum, typeArrayOop anno) duke@435: { set_methods_annotations_of(idnum, anno, &_methods_annotations); } duke@435: void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) duke@435: { set_methods_annotations_of(idnum, anno, &_methods_annotations); } duke@435: void set_method_default_annotations_of(int idnum, typeArrayOop anno) duke@435: { set_methods_annotations_of(idnum, anno, &_methods_annotations); } duke@435: duke@435: // allocation duke@435: DEFINE_ALLOCATE_PERMANENT(instanceKlass); duke@435: instanceOop allocate_instance(TRAPS); duke@435: instanceOop allocate_permanent_instance(TRAPS); duke@435: duke@435: // additional member function to return a handle duke@435: instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } duke@435: duke@435: objArrayOop allocate_objArray(int n, int length, TRAPS); duke@435: // Helper function duke@435: static instanceOop register_finalizer(instanceOop i, TRAPS); duke@435: duke@435: // Check whether reflection/jni/jvm code is allowed to instantiate this class; duke@435: // if not, throw either an Error or an Exception. duke@435: virtual void check_valid_for_instantiation(bool throwError, TRAPS); duke@435: duke@435: // initialization duke@435: void call_class_initializer(TRAPS); duke@435: void set_initialization_state_and_notify(ClassState state, TRAPS); duke@435: duke@435: // OopMapCache support duke@435: OopMapCache* oop_map_cache() { return _oop_map_cache; } duke@435: void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } duke@435: void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); duke@435: duke@435: // JNI identifier support (for static fields - for jni performance) duke@435: JNIid* jni_ids() { return _jni_ids; } duke@435: void set_jni_ids(JNIid* ids) { _jni_ids = ids; } duke@435: JNIid* jni_id_for(int offset); duke@435: duke@435: // maintenance of deoptimization dependencies duke@435: int mark_dependent_nmethods(DepChange& changes); duke@435: void add_dependent_nmethod(nmethod* nm); duke@435: void remove_dependent_nmethod(nmethod* nm); duke@435: duke@435: // On-stack replacement support duke@435: nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; duke@435: void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; duke@435: void add_osr_nmethod(nmethod* n); duke@435: void remove_osr_nmethod(nmethod* n); iveresov@2138: nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; duke@435: duke@435: // Breakpoint support (see methods on methodOop for details) duke@435: BreakpointInfo* breakpoints() const { return _breakpoints; }; duke@435: void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; duke@435: duke@435: // support for stub routines duke@435: static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } duke@435: static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } duke@435: duke@435: // subclass/subinterface checks duke@435: bool implements_interface(klassOop k) const; duke@435: duke@435: // Access to implementors of an interface. We only store the count duke@435: // of implementors, and in case, there are only a few duke@435: // implementors, we store them in a short list. duke@435: // This accessor returns NULL if we walk off the end of the list. duke@435: klassOop implementor(int i) const { duke@435: return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; duke@435: } duke@435: int nof_implementors() const { return _nof_implementors; } duke@435: void add_implementor(klassOop k); // k is a new class that implements this interface duke@435: void init_implementor(); // initialize duke@435: duke@435: // link this class into the implementors list of every interface it implements duke@435: void process_interfaces(Thread *thread); duke@435: duke@435: // virtual operations from Klass duke@435: bool is_leaf_class() const { return _subklass == NULL; } duke@435: objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); duke@435: bool compute_is_subtype_of(klassOop k); duke@435: bool can_be_primary_super_slow() const; duke@435: klassOop java_super() const { return super(); } duke@435: int oop_size(oop obj) const { return size_helper(); } duke@435: int klass_oop_size() const { return object_size(); } duke@435: bool oop_is_instance_slow() const { return true; } duke@435: duke@435: // Iterators duke@435: void do_local_static_fields(FieldClosure* cl); duke@435: void do_nonstatic_fields(FieldClosure* cl); // including inherited fields duke@435: void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); duke@435: duke@435: void methods_do(void f(methodOop method)); duke@435: void array_klasses_do(void f(klassOop k)); duke@435: void with_array_klasses_do(void f(klassOop k)); duke@435: bool super_types_do(SuperTypeClosure* blk); duke@435: duke@435: // Casting from klassOop duke@435: static instanceKlass* cast(klassOop k) { never@2658: assert(k->is_klass(), "must be"); duke@435: Klass* kp = k->klass_part(); duke@435: assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); duke@435: return (instanceKlass*) kp; duke@435: } duke@435: duke@435: // Sizing (in words) duke@435: static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } never@2658: int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } duke@435: static int vtable_start_offset() { return header_size(); } duke@435: static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } duke@435: static int object_size(int extra) { return align_object_size(header_size() + extra); } duke@435: duke@435: intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } duke@435: intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } duke@435: int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } duke@435: duke@435: intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } duke@435: never@2658: address static_field_addr(int offset); coleenp@548: coleenp@548: OopMapBlock* start_of_nonstatic_oop_maps() const { never@2658: return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); coleenp@548: } duke@435: duke@435: // Allocation profiling support duke@435: juint alloc_size() const { return _alloc_count * size_helper(); } duke@435: void set_alloc_size(juint n) {} duke@435: duke@435: // Use this to return the size of an instance in heap words: duke@435: int size_helper() const { duke@435: return layout_helper_to_size_helper(layout_helper()); duke@435: } duke@435: duke@435: // This bit is initialized in classFileParser.cpp. duke@435: // It is false under any of the following conditions: duke@435: // - the class is abstract (including any interface) duke@435: // - the class has a finalizer (if !RegisterFinalizersAtInit) duke@435: // - the class size is larger than FastAllocateSizeLimit duke@435: // - the class is java/lang/Class, which cannot be allocated directly duke@435: bool can_be_fastpath_allocated() const { duke@435: return !layout_helper_needs_slow_path(layout_helper()); duke@435: } duke@435: duke@435: // Java vtable/itable duke@435: klassVtable* vtable() const; // return new klassVtable wrapper duke@435: inline methodOop method_at_vtable(int index); duke@435: klassItable* itable() const; // return new klassItable wrapper duke@435: methodOop method_at_itable(klassOop holder, int index, TRAPS); duke@435: duke@435: // Garbage collection duke@435: void oop_follow_contents(oop obj); duke@435: int oop_adjust_pointers(oop obj); duke@435: bool object_is_parsable() const { return _init_state != unparsable_by_gc; } duke@435: // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. duke@435: duke@435: void follow_weak_klass_links( duke@435: BoolObjectClosure* is_alive, OopClosure* keep_alive); duke@435: void release_C_heap_structures(); duke@435: duke@435: // Parallel Scavenge and Parallel Old duke@435: PARALLEL_GC_DECLS duke@435: duke@435: // Naming jrose@1474: const char* signature_name() const; duke@435: duke@435: // Iterators duke@435: int oop_oop_iterate(oop obj, OopClosure* blk) { duke@435: return oop_oop_iterate_v(obj, blk); duke@435: } duke@435: duke@435: int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { duke@435: return oop_oop_iterate_v_m(obj, blk, mr); duke@435: } duke@435: ysr@777: #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ ysr@777: int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ ysr@777: int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ duke@435: MemRegion mr); duke@435: duke@435: ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) ysr@777: ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) ysr@777: ysr@777: #ifndef SERIALGC ysr@777: #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ ysr@777: int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); ysr@777: ysr@777: ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) ysr@777: ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) ysr@777: #endif // !SERIALGC duke@435: duke@435: private: duke@435: // initialization state duke@435: #ifdef ASSERT duke@435: void set_init_state(ClassState state); duke@435: #else duke@435: void set_init_state(ClassState state) { _init_state = state; } duke@435: #endif acorn@1410: void set_rewritten() { _rewritten = true; } duke@435: void set_init_thread(Thread *thread) { _init_thread = thread; } duke@435: duke@435: u2 idnum_allocated_count() const { return _idnum_allocated_count; } dcubed@1412: // The RedefineClasses() API can cause new method idnums to be needed dcubed@1412: // which will cause the caches to grow. Safety requires different dcubed@1412: // cache management logic if the caches can grow instead of just dcubed@1412: // going from NULL to non-NULL. dcubed@1412: bool idnum_can_increment() const { return has_been_redefined(); } duke@435: jmethodID* methods_jmethod_ids_acquire() const duke@435: { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } duke@435: void release_set_methods_jmethod_ids(jmethodID* jmeths) duke@435: { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } duke@435: duke@435: int* methods_cached_itable_indices_acquire() const duke@435: { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } duke@435: void release_set_methods_cached_itable_indices(int* indices) duke@435: { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } duke@435: duke@435: inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); duke@435: void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } duke@435: void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); duke@435: duke@435: // Offsets for memory management duke@435: oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} duke@435: oop* adr_methods() const { return (oop*)&this->_methods;} duke@435: oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} duke@435: oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} duke@435: oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} duke@435: oop* adr_fields() const { return (oop*)&this->_fields;} duke@435: oop* adr_constants() const { return (oop*)&this->_constants;} duke@435: oop* adr_class_loader() const { return (oop*)&this->_class_loader;} duke@435: oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} jrose@866: oop* adr_host_klass() const { return (oop*)&this->_host_klass;} duke@435: oop* adr_signers() const { return (oop*)&this->_signers;} duke@435: oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} duke@435: oop* adr_implementors() const { return (oop*)&this->_implementors[0];} jrose@2638: oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} // AllowTransitionalJSR292 ONLY duke@435: oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} duke@435: oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} duke@435: oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} duke@435: oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} duke@435: oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} duke@435: oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} duke@435: oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} duke@435: duke@435: // Static methods that are used to implement member methods where an exposed this pointer duke@435: // is needed due to possible GCs duke@435: static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); duke@435: static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); duke@435: static void initialize_impl (instanceKlassHandle this_oop, TRAPS); duke@435: static void eager_initialize_impl (instanceKlassHandle this_oop); duke@435: static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); duke@435: static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); duke@435: static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); duke@435: static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); duke@435: /* jni_id_for_impl for jfieldID only */ duke@435: static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); duke@435: duke@435: // Returns the array class for the n'th dimension duke@435: klassOop array_klass_impl(bool or_null, int n, TRAPS); duke@435: duke@435: // Returns the array class with this class as element type duke@435: klassOop array_klass_impl(bool or_null, TRAPS); duke@435: duke@435: public: duke@435: // sharing support duke@435: virtual void remove_unshareable_info(); coleenp@2497: virtual void shared_symbols_iterate(SymbolClosure* closure); duke@435: duke@435: // jvm support duke@435: jint compute_modifier_flags(TRAPS) const; duke@435: duke@435: public: duke@435: // JVMTI support duke@435: jint jvmti_class_status() const; duke@435: duke@435: public: duke@435: // Printing jrose@1590: void oop_print_value_on(oop obj, outputStream* st); jrose@1590: #ifndef PRODUCT duke@435: void oop_print_on (oop obj, outputStream* st); duke@435: duke@435: void print_dependent_nmethods(bool verbose = false); duke@435: bool is_dependent_nmethod(nmethod* nm); duke@435: #endif duke@435: duke@435: // Verification duke@435: const char* internal_name() const; duke@435: void oop_verify_on(oop obj, outputStream* st); duke@435: duke@435: #ifndef PRODUCT duke@435: static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; duke@435: #endif duke@435: }; duke@435: duke@435: inline methodOop instanceKlass::method_at_vtable(int index) { duke@435: #ifndef PRODUCT duke@435: assert(index >= 0, "valid vtable index"); duke@435: if (DebugVtables) { duke@435: verify_vtable_index(index); duke@435: } duke@435: #endif duke@435: vtableEntry* ve = (vtableEntry*)start_of_vtable(); duke@435: return ve[index].method(); duke@435: } duke@435: duke@435: inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { duke@435: if (annos == NULL || annos->length() <= idnum) { duke@435: return NULL; duke@435: } duke@435: return typeArrayOop(annos->obj_at(idnum)); duke@435: } duke@435: duke@435: // for adding methods duke@435: // UNSET_IDNUM return means no more ids available duke@435: inline u2 instanceKlass::next_method_idnum() { duke@435: if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { duke@435: return constMethodOopDesc::UNSET_IDNUM; // no more ids available duke@435: } else { duke@435: return _idnum_allocated_count++; duke@435: } duke@435: } duke@435: duke@435: duke@435: /* JNIid class for jfieldIDs only */ duke@435: class JNIid: public CHeapObj { duke@435: friend class VMStructs; duke@435: private: duke@435: klassOop _holder; duke@435: JNIid* _next; duke@435: int _offset; duke@435: #ifdef ASSERT duke@435: bool _is_static_field_id; duke@435: #endif duke@435: duke@435: public: duke@435: // Accessors duke@435: klassOop holder() const { return _holder; } duke@435: int offset() const { return _offset; } duke@435: JNIid* next() { return _next; } duke@435: // Constructor duke@435: JNIid(klassOop holder, int offset, JNIid* next); duke@435: // Identifier lookup duke@435: JNIid* find(int offset); duke@435: never@2658: bool find_local_field(fieldDescriptor* fd) { never@2658: return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); never@2658: } never@2658: duke@435: // Garbage collection support duke@435: oop* holder_addr() { return (oop*)&_holder; } duke@435: void oops_do(OopClosure* f); duke@435: static void deallocate(JNIid* id); duke@435: // Debugging duke@435: #ifdef ASSERT duke@435: bool is_static_field_id() const { return _is_static_field_id; } duke@435: void set_is_static_field_id() { _is_static_field_id = true; } duke@435: #endif duke@435: void verify(klassOop holder); duke@435: }; duke@435: duke@435: duke@435: // If breakpoints are more numerous than just JVMTI breakpoints, duke@435: // consider compressing this data structure. duke@435: // It is currently a simple linked list defined in methodOop.hpp. duke@435: duke@435: class BreakpointInfo; duke@435: duke@435: duke@435: // A collection point for interesting information about the previous duke@435: // version(s) of an instanceKlass. This class uses weak references to duke@435: // the information so that the information may be collected as needed dcubed@482: // by the system. If the information is shared, then a regular dcubed@482: // reference must be used because a weak reference would be seen as dcubed@482: // collectible. A GrowableArray of PreviousVersionNodes is attached duke@435: // to the instanceKlass as needed. See PreviousVersionWalker below. duke@435: class PreviousVersionNode : public CHeapObj { duke@435: private: dcubed@482: // A shared ConstantPool is never collected so we'll always have dcubed@482: // a reference to it so we can update items in the cache. We'll dcubed@482: // have a weak reference to a non-shared ConstantPool until all dcubed@482: // of the methods (EMCP or obsolete) have been collected; the dcubed@482: // non-shared ConstantPool becomes collectible at that point. dcubed@482: jobject _prev_constant_pool; // regular or weak reference dcubed@482: bool _prev_cp_is_weak; // true if not a shared ConstantPool dcubed@482: duke@435: // If the previous version of the instanceKlass doesn't have any duke@435: // EMCP methods, then _prev_EMCP_methods will be NULL. If all the duke@435: // EMCP methods have been collected, then _prev_EMCP_methods can duke@435: // have a length of zero. duke@435: GrowableArray* _prev_EMCP_methods; duke@435: duke@435: public: dcubed@482: PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, duke@435: GrowableArray* prev_EMCP_methods); duke@435: ~PreviousVersionNode(); dcubed@482: jobject prev_constant_pool() const { duke@435: return _prev_constant_pool; duke@435: } duke@435: GrowableArray* prev_EMCP_methods() const { duke@435: return _prev_EMCP_methods; duke@435: } duke@435: }; duke@435: duke@435: duke@435: // A Handle-ized version of PreviousVersionNode. duke@435: class PreviousVersionInfo : public ResourceObj { duke@435: private: duke@435: constantPoolHandle _prev_constant_pool_handle; duke@435: // If the previous version of the instanceKlass doesn't have any duke@435: // EMCP methods, then _prev_EMCP_methods will be NULL. Since the duke@435: // methods cannot be collected while we hold a handle, duke@435: // _prev_EMCP_methods should never have a length of zero. duke@435: GrowableArray* _prev_EMCP_method_handles; duke@435: duke@435: public: duke@435: PreviousVersionInfo(PreviousVersionNode *pv_node); duke@435: ~PreviousVersionInfo(); duke@435: constantPoolHandle prev_constant_pool_handle() const { duke@435: return _prev_constant_pool_handle; duke@435: } duke@435: GrowableArray* prev_EMCP_method_handles() const { duke@435: return _prev_EMCP_method_handles; duke@435: } duke@435: }; duke@435: duke@435: duke@435: // Helper object for walking previous versions. This helper cleans up duke@435: // the Handles that it allocates when the helper object is destroyed. duke@435: // The PreviousVersionInfo object returned by next_previous_version() duke@435: // is only valid until a subsequent call to next_previous_version() or duke@435: // the helper object is destroyed. duke@435: class PreviousVersionWalker : public StackObj { duke@435: private: duke@435: GrowableArray* _previous_versions; duke@435: int _current_index; duke@435: // Fields for cleaning up when we are done walking the previous versions: duke@435: // A HandleMark for the PreviousVersionInfo handles: duke@435: HandleMark _hm; duke@435: duke@435: // It would be nice to have a ResourceMark field in this helper also, duke@435: // but the ResourceMark code says to be careful to delete handles held duke@435: // in GrowableArrays _before_ deleting the GrowableArray. Since we duke@435: // can't guarantee the order in which the fields are destroyed, we duke@435: // have to let the creator of the PreviousVersionWalker object do duke@435: // the right thing. Also, adding a ResourceMark here causes an duke@435: // include loop. duke@435: duke@435: // A pointer to the current info object so we can handle the deletes. duke@435: PreviousVersionInfo * _current_p; duke@435: duke@435: public: duke@435: PreviousVersionWalker(instanceKlass *ik); duke@435: ~PreviousVersionWalker(); duke@435: duke@435: // Return the interesting information for the next previous version duke@435: // of the klass. Returns NULL if there are no more previous versions. duke@435: PreviousVersionInfo* next_previous_version(); duke@435: }; stefank@2314: stefank@2314: #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP