--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/oops/instanceKlass.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,918 @@
+/*
+ * Copyright 1997-2007 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;
+ // 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;
+ // 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.
+ //
+
+ int _nonstatic_field_size; // number of non-static fields in this klass (including inherited fields)
+ int _static_field_size; // number of 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.
+ 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:
+ // 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
+ };
+
+ // 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);
+
+ // 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 ((offset/wordSize) >= instanceOopDesc::header_size() &&
+ (offset/wordSize)-instanceOopDesc::header_size() < 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); }
+
+ // 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; }
+
+ // jmethodID support
+ 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(); }
+
+ oop* start_of_static_fields() const { return (oop*)(start_of_itable() + align_object_offset(itable_length())); }
+ intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
+ oop* end_of_static_fields() const { return start_of_static_fields() + static_field_size(); }
+ 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_3(InstanceKlass_OOP_OOP_ITERATE_DECL)
+
+ 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_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_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. A GrowableArray of PreviousVersionNodes is attached
+// to the instanceKlass as needed. See PreviousVersionWalker below.
+class PreviousVersionNode : public CHeapObj {
+ private:
+ jweak _prev_constant_pool;
+ // 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(jweak prev_constant_pool,
+ GrowableArray<jweak>* prev_EMCP_methods);
+ ~PreviousVersionNode();
+ jweak 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();
+};