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src/share/vm/oops/instanceKlass.hpp@f8236e79048a (annotated)

src/share/vm/oops/instanceKlass.hpp

Wed, 05 Dec 2007 09:00:00 -0800

author

dcubed

date

Wed, 05 Dec 2007 09:00:00 -0800

changeset 451

f8236e79048a

parent 435

a61af66fc99e

child 482

2c106685d6d0

permissions

-rw-r--r--

6664627: Merge changes made only in hotspot 11 forward to jdk 7
Reviewed-by: jcoomes

duke@435	1	/*
duke@435	2	* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// An instanceKlass is the VM level representation of a Java class.
duke@435	26	// It contains all information needed for at class at execution runtime.
duke@435	27
duke@435	28	// instanceKlass layout:
duke@435	29	// [header ] klassOop
duke@435	30	// [klass pointer ] klassOop
duke@435	31	// [C++ vtbl pointer ] Klass
duke@435	32	// [subtype cache ] Klass
duke@435	33	// [instance size ] Klass
duke@435	34	// [java mirror ] Klass
duke@435	35	// [super ] Klass
duke@435	36	// [access_flags ] Klass
duke@435	37	// [name ] Klass
duke@435	38	// [first subklass ] Klass
duke@435	39	// [next sibling ] Klass
duke@435	40	// [array klasses ]
duke@435	41	// [methods ]
duke@435	42	// [local interfaces ]
duke@435	43	// [transitive interfaces ]
duke@435	44	// [number of implementors ]
duke@435	45	// [implementors ] klassOop[2]
duke@435	46	// [fields ]
duke@435	47	// [constants ]
duke@435	48	// [class loader ]
duke@435	49	// [protection domain ]
duke@435	50	// [signers ]
duke@435	51	// [source file name ]
duke@435	52	// [inner classes ]
duke@435	53	// [static field size ]
duke@435	54	// [nonstatic field size ]
duke@435	55	// [static oop fields size ]
duke@435	56	// [nonstatic oop maps size ]
duke@435	57	// [has finalize method ]
duke@435	58	// [deoptimization mark bit ]
duke@435	59	// [initialization state ]
duke@435	60	// [initializing thread ]
duke@435	61	// [Java vtable length ]
duke@435	62	// [oop map cache (stack maps) ]
duke@435	63	// [EMBEDDED Java vtable ] size in words = vtable_len
duke@435	64	// [EMBEDDED static oop fields ] size in words = static_oop_fields_size
duke@435	65	// [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
duke@435	66	// [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
duke@435	67	//
duke@435	68	// The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
duke@435	69	// where oops are located in instances of this klass.
duke@435	70
duke@435	71
duke@435	72	// forward declaration for class -- see below for definition
duke@435	73	class SuperTypeClosure;
duke@435	74	class OopMapBlock;
duke@435	75	class JNIid;
duke@435	76	class jniIdMapBase;
duke@435	77	class BreakpointInfo;
duke@435	78	class fieldDescriptor;
duke@435	79	class DepChange;
duke@435	80	class nmethodBucket;
duke@435	81	class PreviousVersionNode;
duke@435	82	class JvmtiCachedClassFieldMap;
duke@435	83
duke@435	84	// This is used in iterators below.
duke@435	85	class FieldClosure: public StackObj {
duke@435	86	public:
duke@435	87	virtual void do_field(fieldDescriptor* fd) = 0;
duke@435	88	};
duke@435	89
duke@435	90	#ifndef PRODUCT
duke@435	91	// Print fields.
duke@435	92	// If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
duke@435	93	class FieldPrinter: public FieldClosure {
duke@435	94	oop _obj;
duke@435	95	outputStream* _st;
duke@435	96	public:
duke@435	97	FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
duke@435	98	void do_field(fieldDescriptor* fd);
duke@435	99	};
duke@435	100	#endif // !PRODUCT
duke@435	101
duke@435	102	class instanceKlass: public Klass {
duke@435	103	friend class VMStructs;
duke@435	104	public:
duke@435	105	// See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
duke@435	106	// of the class loading & initialization procedure, and the use of the states.
duke@435	107	enum ClassState {
duke@435	108	unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
duke@435	109	allocated, // allocated (but not yet linked)
duke@435	110	loaded, // loaded and inserted in class hierarchy (but not linked yet)
duke@435	111	linked, // successfully linked/verified (but not initialized yet)
duke@435	112	being_initialized, // currently running class initializer
duke@435	113	fully_initialized, // initialized (successfull final state)
duke@435	114	initialization_error // error happened during initialization
duke@435	115	};
duke@435	116
duke@435	117	public:
duke@435	118	oop* oop_block_beg() const { return adr_array_klasses(); }
duke@435	119	oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
duke@435	120
duke@435	121	enum {
duke@435	122	implementors_limit = 2 // how many implems can we track?
duke@435	123	};
duke@435	124
duke@435	125	protected:
duke@435	126	//
duke@435	127	// The oop block. See comment in klass.hpp before making changes.
duke@435	128	//
duke@435	129
duke@435	130	// Array classes holding elements of this class.
duke@435	131	klassOop _array_klasses;
duke@435	132	// Method array.
duke@435	133	objArrayOop _methods;
duke@435	134	// Int array containing the original order of method in the class file (for
duke@435	135	// JVMTI).
duke@435	136	typeArrayOop _method_ordering;
duke@435	137	// Interface (klassOops) this class declares locally to implement.
duke@435	138	objArrayOop _local_interfaces;
duke@435	139	// Interface (klassOops) this class implements transitively.
duke@435	140	objArrayOop _transitive_interfaces;
duke@435	141	// Instance and static variable information, 5-tuples of shorts [access, name
duke@435	142	// index, sig index, initval index, offset].
duke@435	143	typeArrayOop _fields;
duke@435	144	// Constant pool for this class.
duke@435	145	constantPoolOop _constants;
duke@435	146	// Class loader used to load this class, NULL if VM loader used.
duke@435	147	oop _class_loader;
duke@435	148	// Protection domain.
duke@435	149	oop _protection_domain;
duke@435	150	// Class signers.
duke@435	151	objArrayOop _signers;
duke@435	152	// Name of source file containing this klass, NULL if not specified.
duke@435	153	symbolOop _source_file_name;
duke@435	154	// the source debug extension for this klass, NULL if not specified.
duke@435	155	symbolOop _source_debug_extension;
duke@435	156	// inner_classes attribute.
duke@435	157	typeArrayOop _inner_classes;
duke@435	158	// Implementors of this interface (not valid if it overflows)
duke@435	159	klassOop _implementors[implementors_limit];
duke@435	160	// Generic signature, or null if none.
duke@435	161	symbolOop _generic_signature;
duke@435	162	// Annotations for this class, or null if none.
duke@435	163	typeArrayOop _class_annotations;
duke@435	164	// Annotation objects (byte arrays) for fields, or null if no annotations.
duke@435	165	// Indices correspond to entries (not indices) in fields array.
duke@435	166	objArrayOop _fields_annotations;
duke@435	167	// Annotation objects (byte arrays) for methods, or null if no annotations.
duke@435	168	// Index is the idnum, which is initially the same as the methods array index.
duke@435	169	objArrayOop _methods_annotations;
duke@435	170	// Annotation objects (byte arrays) for methods' parameters, or null if no
duke@435	171	// such annotations.
duke@435	172	// Index is the idnum, which is initially the same as the methods array index.
duke@435	173	objArrayOop _methods_parameter_annotations;
duke@435	174	// Annotation objects (byte arrays) for methods' default values, or null if no
duke@435	175	// such annotations.
duke@435	176	// Index is the idnum, which is initially the same as the methods array index.
duke@435	177	objArrayOop _methods_default_annotations;
duke@435	178
duke@435	179	//
duke@435	180	// End of the oop block.
duke@435	181	//
duke@435	182
duke@435	183	int _nonstatic_field_size; // number of non-static fields in this klass (including inherited fields)
duke@435	184	int _static_field_size; // number of static fields (oop and non-oop) in this klass
duke@435	185	int _static_oop_field_size;// number of static oop fields in this klass
duke@435	186	int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
duke@435	187	bool _is_marked_dependent; // used for marking during flushing and deoptimization
duke@435	188	bool _rewritten; // methods rewritten.
duke@435	189	u2 _minor_version; // minor version number of class file
duke@435	190	u2 _major_version; // major version number of class file
duke@435	191	ClassState _init_state; // state of class
duke@435	192	Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
duke@435	193	int _vtable_len; // length of Java vtable (in words)
duke@435	194	int _itable_len; // length of Java itable (in words)
duke@435	195	ReferenceType _reference_type; // reference type
duke@435	196	OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
duke@435	197	JNIid* _jni_ids; // First JNI identifier for static fields in this class
duke@435	198	jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
duke@435	199	int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
duke@435	200	nmethodBucket* _dependencies; // list of dependent nmethods
duke@435	201	nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
duke@435	202	BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
duke@435	203	int _nof_implementors; // No of implementors of this interface (zero if not an interface)
duke@435	204	// Array of interesting part(s) of the previous version(s) of this
duke@435	205	// instanceKlass. See PreviousVersionWalker below.
duke@435	206	GrowableArray<PreviousVersionNode *>* _previous_versions;
duke@435	207	u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
duke@435	208	u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
duke@435	209	// JVMTI fields can be moved to their own structure - see 6315920
duke@435	210	unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
duke@435	211	jint _cached_class_file_len; // JVMTI: length of above
duke@435	212	JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
duke@435	213	volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
duke@435	214
duke@435	215	// embedded Java vtable follows here
duke@435	216	// embedded Java itables follows here
duke@435	217	// embedded static fields follows here
duke@435	218	// embedded nonstatic oop-map blocks follows here
duke@435	219
duke@435	220	friend class instanceKlassKlass;
duke@435	221	friend class SystemDictionary;
duke@435	222
duke@435	223	public:
duke@435	224	// field sizes
duke@435	225	int nonstatic_field_size() const { return _nonstatic_field_size; }
duke@435	226	void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
duke@435	227
duke@435	228	int static_field_size() const { return _static_field_size; }
duke@435	229	void set_static_field_size(int size) { _static_field_size = size; }
duke@435	230
duke@435	231	int static_oop_field_size() const { return _static_oop_field_size; }
duke@435	232	void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
duke@435	233
duke@435	234	// Java vtable
duke@435	235	int vtable_length() const { return _vtable_len; }
duke@435	236	void set_vtable_length(int len) { _vtable_len = len; }
duke@435	237
duke@435	238	// Java itable
duke@435	239	int itable_length() const { return _itable_len; }
duke@435	240	void set_itable_length(int len) { _itable_len = len; }
duke@435	241
duke@435	242	// array klasses
duke@435	243	klassOop array_klasses() const { return _array_klasses; }
duke@435	244	void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
duke@435	245
duke@435	246	// methods
duke@435	247	objArrayOop methods() const { return _methods; }
duke@435	248	void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
duke@435	249	methodOop method_with_idnum(int idnum);
duke@435	250
duke@435	251	// method ordering
duke@435	252	typeArrayOop method_ordering() const { return _method_ordering; }
duke@435	253	void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
duke@435	254
duke@435	255	// interfaces
duke@435	256	objArrayOop local_interfaces() const { return _local_interfaces; }
duke@435	257	void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
duke@435	258	objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
duke@435	259	void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
duke@435	260
duke@435	261	// fields
duke@435	262	// Field info extracted from the class file and stored
duke@435	263	// as an array of 7 shorts
duke@435	264	enum FieldOffset {
duke@435	265	access_flags_offset = 0,
duke@435	266	name_index_offset = 1,
duke@435	267	signature_index_offset = 2,
duke@435	268	initval_index_offset = 3,
duke@435	269	low_offset = 4,
duke@435	270	high_offset = 5,
duke@435	271	generic_signature_offset = 6,
duke@435	272	next_offset = 7
duke@435	273	};
duke@435	274
duke@435	275	typeArrayOop fields() const { return _fields; }
duke@435	276	int offset_from_fields( int index ) const {
duke@435	277	return build_int_from_shorts( fields()->ushort_at(index + low_offset),
duke@435	278	fields()->ushort_at(index + high_offset) );
duke@435	279	}
duke@435	280
duke@435	281	void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
duke@435	282
duke@435	283	// inner classes
duke@435	284	typeArrayOop inner_classes() const { return _inner_classes; }
duke@435	285	void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
duke@435	286
duke@435	287	enum InnerClassAttributeOffset {
duke@435	288	// From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
duke@435	289	inner_class_inner_class_info_offset = 0,
duke@435	290	inner_class_outer_class_info_offset = 1,
duke@435	291	inner_class_inner_name_offset = 2,
duke@435	292	inner_class_access_flags_offset = 3,
duke@435	293	inner_class_next_offset = 4
duke@435	294	};
duke@435	295
duke@435	296	// package
duke@435	297	bool is_same_class_package(klassOop class2);
duke@435	298	bool is_same_class_package(oop classloader2, symbolOop classname2);
duke@435	299	static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
duke@435	300
duke@435	301	// initialization state
duke@435	302	bool is_loaded() const { return _init_state >= loaded; }
duke@435	303	bool is_linked() const { return _init_state >= linked; }
duke@435	304	bool is_initialized() const { return _init_state == fully_initialized; }
duke@435	305	bool is_not_initialized() const { return _init_state < being_initialized; }
duke@435	306	bool is_being_initialized() const { return _init_state == being_initialized; }
duke@435	307	bool is_in_error_state() const { return _init_state == initialization_error; }
duke@435	308	bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
duke@435	309	int get_init_state() { return _init_state; } // Useful for debugging
duke@435	310	bool is_rewritten() const { return _rewritten; }
duke@435	311
duke@435	312	// marking
duke@435	313	bool is_marked_dependent() const { return _is_marked_dependent; }
duke@435	314	void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
duke@435	315
duke@435	316	// initialization (virtuals from Klass)
duke@435	317	bool should_be_initialized() const; // means that initialize should be called
duke@435	318	void initialize(TRAPS);
duke@435	319	void link_class(TRAPS);
duke@435	320	bool link_class_or_fail(TRAPS); // returns false on failure
duke@435	321	void unlink_class();
duke@435	322	void rewrite_class(TRAPS);
duke@435	323	methodOop class_initializer();
duke@435	324
duke@435	325	// set the class to initialized if no static initializer is present
duke@435	326	void eager_initialize(Thread *thread);
duke@435	327
duke@435	328	// reference type
duke@435	329	ReferenceType reference_type() const { return _reference_type; }
duke@435	330	void set_reference_type(ReferenceType t) { _reference_type = t; }
duke@435	331
duke@435	332	// find local field, returns true if found
duke@435	333	bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	334	// find field in direct superinterfaces, returns the interface in which the field is defined
duke@435	335	klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	336	// find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
duke@435	337	klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	338	// find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
duke@435	339	klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
duke@435	340
duke@435	341	// find a non-static or static field given its offset within the class.
duke@435	342	bool contains_field_offset(int offset) {
duke@435	343	return ((offset/wordSize) >= instanceOopDesc::header_size() &&
duke@435	344	(offset/wordSize)-instanceOopDesc::header_size() < nonstatic_field_size());
duke@435	345	}
duke@435	346
duke@435	347	bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
duke@435	348	bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
duke@435	349
duke@435	350	// find a local method (returns NULL if not found)
duke@435	351	methodOop find_method(symbolOop name, symbolOop signature) const;
duke@435	352	static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
duke@435	353
duke@435	354	// lookup operation (returns NULL if not found)
duke@435	355	methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
duke@435	356
duke@435	357	// lookup a method in all the interfaces that this class implements
duke@435	358	// (returns NULL if not found)
duke@435	359	methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
duke@435	360
duke@435	361	// constant pool
duke@435	362	constantPoolOop constants() const { return _constants; }
duke@435	363	void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
duke@435	364
duke@435	365	// class loader
duke@435	366	oop class_loader() const { return _class_loader; }
duke@435	367	void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
duke@435	368
duke@435	369	// protection domain
duke@435	370	oop protection_domain() { return _protection_domain; }
duke@435	371	void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
duke@435	372
duke@435	373	// signers
duke@435	374	objArrayOop signers() const { return _signers; }
duke@435	375	void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
duke@435	376
duke@435	377	// source file name
duke@435	378	symbolOop source_file_name() const { return _source_file_name; }
duke@435	379	void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
duke@435	380
duke@435	381	// minor and major version numbers of class file
duke@435	382	u2 minor_version() const { return _minor_version; }
duke@435	383	void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
duke@435	384	u2 major_version() const { return _major_version; }
duke@435	385	void set_major_version(u2 major_version) { _major_version = major_version; }
duke@435	386
duke@435	387	// source debug extension
duke@435	388	symbolOop source_debug_extension() const { return _source_debug_extension; }
duke@435	389	void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
duke@435	390
duke@435	391	// nonstatic oop-map blocks
duke@435	392	int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
duke@435	393	void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
duke@435	394
duke@435	395	// RedefineClasses() support for previous versions:
duke@435	396	void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
duke@435	397	int emcp_method_count);
duke@435	398	bool has_previous_version() const;
duke@435	399	void init_previous_versions() {
duke@435	400	_previous_versions = NULL;
duke@435	401	}
duke@435	402	GrowableArray<PreviousVersionNode *>* previous_versions() const {
duke@435	403	return _previous_versions;
duke@435	404	}
duke@435	405
duke@435	406	// JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
duke@435	407	void set_cached_class_file(unsigned char *class_file_bytes,
duke@435	408	jint class_file_len) { _cached_class_file_len = class_file_len;
duke@435	409	_cached_class_file_bytes = class_file_bytes; }
duke@435	410	jint get_cached_class_file_len() { return _cached_class_file_len; }
duke@435	411	unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
duke@435	412
duke@435	413	// JVMTI: Support for caching of field indices, types, and offsets
duke@435	414	void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
duke@435	415	_jvmti_cached_class_field_map = descriptor;
duke@435	416	}
duke@435	417	JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
duke@435	418	return _jvmti_cached_class_field_map;
duke@435	419	}
duke@435	420
duke@435	421	// for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
duke@435	422	inline u2 next_method_idnum();
duke@435	423	void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
duke@435	424
duke@435	425	// generics support
duke@435	426	symbolOop generic_signature() const { return _generic_signature; }
duke@435	427	void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
duke@435	428	u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
duke@435	429	u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
duke@435	430	void set_enclosing_method_indices(u2 class_index,
duke@435	431	u2 method_index) { _enclosing_method_class_index = class_index;
duke@435	432	_enclosing_method_method_index = method_index; }
duke@435	433
duke@435	434	// jmethodID support
duke@435	435	static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
duke@435	436	jmethodID jmethod_id_or_null(methodOop method);
duke@435	437
duke@435	438	// cached itable index support
duke@435	439	void set_cached_itable_index(size_t idnum, int index);
duke@435	440	int cached_itable_index(size_t idnum);
duke@435	441
duke@435	442	// annotations support
duke@435	443	typeArrayOop class_annotations() const { return _class_annotations; }
duke@435	444	objArrayOop fields_annotations() const { return _fields_annotations; }
duke@435	445	objArrayOop methods_annotations() const { return _methods_annotations; }
duke@435	446	objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
duke@435	447	objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
duke@435	448	void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
duke@435	449	void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
duke@435	450	void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
duke@435	451	void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
duke@435	452	void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
duke@435	453	typeArrayOop get_method_annotations_of(int idnum)
duke@435	454	{ return get_method_annotations_from(idnum, _methods_annotations); }
duke@435	455	typeArrayOop get_method_parameter_annotations_of(int idnum)
duke@435	456	{ return get_method_annotations_from(idnum, _methods_parameter_annotations); }
duke@435	457	typeArrayOop get_method_default_annotations_of(int idnum)
duke@435	458	{ return get_method_annotations_from(idnum, _methods_default_annotations); }
duke@435	459	void set_method_annotations_of(int idnum, typeArrayOop anno)
duke@435	460	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	461	void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
duke@435	462	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	463	void set_method_default_annotations_of(int idnum, typeArrayOop anno)
duke@435	464	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	465
duke@435	466	// allocation
duke@435	467	DEFINE_ALLOCATE_PERMANENT(instanceKlass);
duke@435	468	instanceOop allocate_instance(TRAPS);
duke@435	469	instanceOop allocate_permanent_instance(TRAPS);
duke@435	470
duke@435	471	// additional member function to return a handle
duke@435	472	instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
duke@435	473
duke@435	474	objArrayOop allocate_objArray(int n, int length, TRAPS);
duke@435	475	// Helper function
duke@435	476	static instanceOop register_finalizer(instanceOop i, TRAPS);
duke@435	477
duke@435	478	// Check whether reflection/jni/jvm code is allowed to instantiate this class;
duke@435	479	// if not, throw either an Error or an Exception.
duke@435	480	virtual void check_valid_for_instantiation(bool throwError, TRAPS);
duke@435	481
duke@435	482	// initialization
duke@435	483	void call_class_initializer(TRAPS);
duke@435	484	void set_initialization_state_and_notify(ClassState state, TRAPS);
duke@435	485
duke@435	486	// OopMapCache support
duke@435	487	OopMapCache* oop_map_cache() { return _oop_map_cache; }
duke@435	488	void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
duke@435	489	void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
duke@435	490
duke@435	491	// JNI identifier support (for static fields - for jni performance)
duke@435	492	JNIid* jni_ids() { return _jni_ids; }
duke@435	493	void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
duke@435	494	JNIid* jni_id_for(int offset);
duke@435	495
duke@435	496	// maintenance of deoptimization dependencies
duke@435	497	int mark_dependent_nmethods(DepChange& changes);
duke@435	498	void add_dependent_nmethod(nmethod* nm);
duke@435	499	void remove_dependent_nmethod(nmethod* nm);
duke@435	500
duke@435	501	// On-stack replacement support
duke@435	502	nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
duke@435	503	void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
duke@435	504	void add_osr_nmethod(nmethod* n);
duke@435	505	void remove_osr_nmethod(nmethod* n);
duke@435	506	nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
duke@435	507
duke@435	508	// Breakpoint support (see methods on methodOop for details)
duke@435	509	BreakpointInfo* breakpoints() const { return _breakpoints; };
duke@435	510	void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
duke@435	511
duke@435	512	// support for stub routines
duke@435	513	static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
duke@435	514	static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
duke@435	515
duke@435	516	// subclass/subinterface checks
duke@435	517	bool implements_interface(klassOop k) const;
duke@435	518
duke@435	519	// Access to implementors of an interface. We only store the count
duke@435	520	// of implementors, and in case, there are only a few
duke@435	521	// implementors, we store them in a short list.
duke@435	522	// This accessor returns NULL if we walk off the end of the list.
duke@435	523	klassOop implementor(int i) const {
duke@435	524	return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
duke@435	525	}
duke@435	526	int nof_implementors() const { return _nof_implementors; }
duke@435	527	void add_implementor(klassOop k); // k is a new class that implements this interface
duke@435	528	void init_implementor(); // initialize
duke@435	529
duke@435	530	// link this class into the implementors list of every interface it implements
duke@435	531	void process_interfaces(Thread *thread);
duke@435	532
duke@435	533	// virtual operations from Klass
duke@435	534	bool is_leaf_class() const { return _subklass == NULL; }
duke@435	535	objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
duke@435	536	bool compute_is_subtype_of(klassOop k);
duke@435	537	bool can_be_primary_super_slow() const;
duke@435	538	klassOop java_super() const { return super(); }
duke@435	539	int oop_size(oop obj) const { return size_helper(); }
duke@435	540	int klass_oop_size() const { return object_size(); }
duke@435	541	bool oop_is_instance_slow() const { return true; }
duke@435	542
duke@435	543	// Iterators
duke@435	544	void do_local_static_fields(FieldClosure* cl);
duke@435	545	void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
duke@435	546	void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
duke@435	547
duke@435	548	void methods_do(void f(methodOop method));
duke@435	549	void array_klasses_do(void f(klassOop k));
duke@435	550	void with_array_klasses_do(void f(klassOop k));
duke@435	551	bool super_types_do(SuperTypeClosure* blk);
duke@435	552
duke@435	553	// Casting from klassOop
duke@435	554	static instanceKlass* cast(klassOop k) {
duke@435	555	Klass* kp = k->klass_part();
duke@435	556	assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
duke@435	557	return (instanceKlass*) kp;
duke@435	558	}
duke@435	559
duke@435	560	// Sizing (in words)
duke@435	561	static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
duke@435	562	int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
duke@435	563	static int vtable_start_offset() { return header_size(); }
duke@435	564	static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
duke@435	565	static int object_size(int extra) { return align_object_size(header_size() + extra); }
duke@435	566
duke@435	567	intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
duke@435	568	intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
duke@435	569	int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
duke@435	570
duke@435	571	oop* start_of_static_fields() const { return (oop*)(start_of_itable() + align_object_offset(itable_length())); }
duke@435	572	intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
duke@435	573	oop* end_of_static_fields() const { return start_of_static_fields() + static_field_size(); }
duke@435	574	int offset_of_static_fields() const { return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); }
duke@435	575
duke@435	576	OopMapBlock* start_of_nonstatic_oop_maps() const { return (OopMapBlock*) (start_of_static_fields() + static_field_size()); }
duke@435	577
duke@435	578	// Allocation profiling support
duke@435	579	juint alloc_size() const { return _alloc_count * size_helper(); }
duke@435	580	void set_alloc_size(juint n) {}
duke@435	581
duke@435	582	// Use this to return the size of an instance in heap words:
duke@435	583	int size_helper() const {
duke@435	584	return layout_helper_to_size_helper(layout_helper());
duke@435	585	}
duke@435	586
duke@435	587	// This bit is initialized in classFileParser.cpp.
duke@435	588	// It is false under any of the following conditions:
duke@435	589	// - the class is abstract (including any interface)
duke@435	590	// - the class has a finalizer (if !RegisterFinalizersAtInit)
duke@435	591	// - the class size is larger than FastAllocateSizeLimit
duke@435	592	// - the class is java/lang/Class, which cannot be allocated directly
duke@435	593	bool can_be_fastpath_allocated() const {
duke@435	594	return !layout_helper_needs_slow_path(layout_helper());
duke@435	595	}
duke@435	596
duke@435	597	// Java vtable/itable
duke@435	598	klassVtable* vtable() const; // return new klassVtable wrapper
duke@435	599	inline methodOop method_at_vtable(int index);
duke@435	600	klassItable* itable() const; // return new klassItable wrapper
duke@435	601	methodOop method_at_itable(klassOop holder, int index, TRAPS);
duke@435	602
duke@435	603	// Garbage collection
duke@435	604	void oop_follow_contents(oop obj);
duke@435	605	void follow_static_fields();
duke@435	606	void adjust_static_fields();
duke@435	607	int oop_adjust_pointers(oop obj);
duke@435	608	bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
duke@435	609	// Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
duke@435	610
duke@435	611	void follow_weak_klass_links(
duke@435	612	BoolObjectClosure* is_alive, OopClosure* keep_alive);
duke@435	613	void release_C_heap_structures();
duke@435	614
duke@435	615	// Parallel Scavenge and Parallel Old
duke@435	616	PARALLEL_GC_DECLS
duke@435	617
duke@435	618	#ifndef SERIALGC
duke@435	619	// Parallel Scavenge
duke@435	620	void copy_static_fields(PSPromotionManager* pm);
duke@435	621	void push_static_fields(PSPromotionManager* pm);
duke@435	622
duke@435	623	// Parallel Old
duke@435	624	void follow_static_fields(ParCompactionManager* cm);
duke@435	625	void copy_static_fields(ParCompactionManager* cm);
duke@435	626	void update_static_fields();
duke@435	627	void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
duke@435	628	#endif // SERIALGC
duke@435	629
duke@435	630	// Naming
duke@435	631	char* signature_name() const;
duke@435	632
duke@435	633	// Iterators
duke@435	634	int oop_oop_iterate(oop obj, OopClosure* blk) {
duke@435	635	return oop_oop_iterate_v(obj, blk);
duke@435	636	}
duke@435	637
duke@435	638	int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
duke@435	639	return oop_oop_iterate_v_m(obj, blk, mr);
duke@435	640	}
duke@435	641
duke@435	642	#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
duke@435	643	int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
duke@435	644	int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
duke@435	645	MemRegion mr);
duke@435	646
duke@435	647	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
duke@435	648	ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceKlass_OOP_OOP_ITERATE_DECL)
duke@435	649
duke@435	650	void iterate_static_fields(OopClosure* closure);
duke@435	651	void iterate_static_fields(OopClosure* closure, MemRegion mr);
duke@435	652
duke@435	653	private:
duke@435	654	// initialization state
duke@435	655	#ifdef ASSERT
duke@435	656	void set_init_state(ClassState state);
duke@435	657	#else
duke@435	658	void set_init_state(ClassState state) { _init_state = state; }
duke@435	659	#endif
duke@435	660	void set_rewritten() { _rewritten = true; }
duke@435	661	void set_init_thread(Thread *thread) { _init_thread = thread; }
duke@435	662
duke@435	663	u2 idnum_allocated_count() const { return _idnum_allocated_count; }
duke@435	664	jmethodID* methods_jmethod_ids_acquire() const
duke@435	665	{ return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
duke@435	666	void release_set_methods_jmethod_ids(jmethodID* jmeths)
duke@435	667	{ OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
duke@435	668
duke@435	669	int* methods_cached_itable_indices_acquire() const
duke@435	670	{ return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
duke@435	671	void release_set_methods_cached_itable_indices(int* indices)
duke@435	672	{ OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
duke@435	673
duke@435	674	inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
duke@435	675	void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
duke@435	676	void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
duke@435	677
duke@435	678	// Offsets for memory management
duke@435	679	oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
duke@435	680	oop* adr_methods() const { return (oop*)&this->_methods;}
duke@435	681	oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
duke@435	682	oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
duke@435	683	oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
duke@435	684	oop* adr_fields() const { return (oop*)&this->_fields;}
duke@435	685	oop* adr_constants() const { return (oop*)&this->_constants;}
duke@435	686	oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
duke@435	687	oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
duke@435	688	oop* adr_signers() const { return (oop*)&this->_signers;}
duke@435	689	oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
duke@435	690	oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
duke@435	691	oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
duke@435	692	oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
duke@435	693	oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
duke@435	694	oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
duke@435	695	oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
duke@435	696	oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
duke@435	697	oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
duke@435	698	oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
duke@435	699	oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
duke@435	700	oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
duke@435	701
duke@435	702	// Static methods that are used to implement member methods where an exposed this pointer
duke@435	703	// is needed due to possible GCs
duke@435	704	static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
duke@435	705	static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
duke@435	706	static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
duke@435	707	static void eager_initialize_impl (instanceKlassHandle this_oop);
duke@435	708	static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
duke@435	709	static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
duke@435	710	static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
duke@435	711	static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
duke@435	712	/* jni_id_for_impl for jfieldID only */
duke@435	713	static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
duke@435	714
duke@435	715	// Returns the array class for the n'th dimension
duke@435	716	klassOop array_klass_impl(bool or_null, int n, TRAPS);
duke@435	717
duke@435	718	// Returns the array class with this class as element type
duke@435	719	klassOop array_klass_impl(bool or_null, TRAPS);
duke@435	720
duke@435	721	public:
duke@435	722	// sharing support
duke@435	723	virtual void remove_unshareable_info();
duke@435	724	void field_names_and_sigs_iterate(OopClosure* closure);
duke@435	725
duke@435	726	// jvm support
duke@435	727	jint compute_modifier_flags(TRAPS) const;
duke@435	728
duke@435	729	public:
duke@435	730	// JVMTI support
duke@435	731	jint jvmti_class_status() const;
duke@435	732
duke@435	733	#ifndef PRODUCT
duke@435	734	public:
duke@435	735	// Printing
duke@435	736	void oop_print_on (oop obj, outputStream* st);
duke@435	737	void oop_print_value_on(oop obj, outputStream* st);
duke@435	738
duke@435	739	void print_dependent_nmethods(bool verbose = false);
duke@435	740	bool is_dependent_nmethod(nmethod* nm);
duke@435	741	#endif
duke@435	742
duke@435	743	public:
duke@435	744	// Verification
duke@435	745	const char* internal_name() const;
duke@435	746	void oop_verify_on(oop obj, outputStream* st);
duke@435	747
duke@435	748	#ifndef PRODUCT
duke@435	749	static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
duke@435	750	#endif
duke@435	751	};
duke@435	752
duke@435	753	inline methodOop instanceKlass::method_at_vtable(int index) {
duke@435	754	#ifndef PRODUCT
duke@435	755	assert(index >= 0, "valid vtable index");
duke@435	756	if (DebugVtables) {
duke@435	757	verify_vtable_index(index);
duke@435	758	}
duke@435	759	#endif
duke@435	760	vtableEntry* ve = (vtableEntry*)start_of_vtable();
duke@435	761	return ve[index].method();
duke@435	762	}
duke@435	763
duke@435	764	inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
duke@435	765	if (annos == NULL || annos->length() <= idnum) {
duke@435	766	return NULL;
duke@435	767	}
duke@435	768	return typeArrayOop(annos->obj_at(idnum));
duke@435	769	}
duke@435	770
duke@435	771	// for adding methods
duke@435	772	// UNSET_IDNUM return means no more ids available
duke@435	773	inline u2 instanceKlass::next_method_idnum() {
duke@435	774	if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
duke@435	775	return constMethodOopDesc::UNSET_IDNUM; // no more ids available
duke@435	776	} else {
duke@435	777	return _idnum_allocated_count++;
duke@435	778	}
duke@435	779	}
duke@435	780
duke@435	781
duke@435	782	// ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
duke@435	783
duke@435	784	class OopMapBlock VALUE_OBJ_CLASS_SPEC {
duke@435	785	private:
duke@435	786	jushort _offset; // Offset of first oop in oop-map block
duke@435	787	jushort _length; // Length of oop-map block
duke@435	788	public:
duke@435	789	// Accessors
duke@435	790	jushort offset() const { return _offset; }
duke@435	791	void set_offset(jushort offset) { _offset = offset; }
duke@435	792
duke@435	793	jushort length() const { return _length; }
duke@435	794	void set_length(jushort length) { _length = length; }
duke@435	795	};
duke@435	796
duke@435	797	/* JNIid class for jfieldIDs only */
duke@435	798	class JNIid: public CHeapObj {
duke@435	799	friend class VMStructs;
duke@435	800	private:
duke@435	801	klassOop _holder;
duke@435	802	JNIid* _next;
duke@435	803	int _offset;
duke@435	804	#ifdef ASSERT
duke@435	805	bool _is_static_field_id;
duke@435	806	#endif
duke@435	807
duke@435	808	public:
duke@435	809	// Accessors
duke@435	810	klassOop holder() const { return _holder; }
duke@435	811	int offset() const { return _offset; }
duke@435	812	JNIid* next() { return _next; }
duke@435	813	// Constructor
duke@435	814	JNIid(klassOop holder, int offset, JNIid* next);
duke@435	815	// Identifier lookup
duke@435	816	JNIid* find(int offset);
duke@435	817
duke@435	818	// Garbage collection support
duke@435	819	oop* holder_addr() { return (oop*)&_holder; }
duke@435	820	void oops_do(OopClosure* f);
duke@435	821	static void deallocate(JNIid* id);
duke@435	822	// Debugging
duke@435	823	#ifdef ASSERT
duke@435	824	bool is_static_field_id() const { return _is_static_field_id; }
duke@435	825	void set_is_static_field_id() { _is_static_field_id = true; }
duke@435	826	#endif
duke@435	827	void verify(klassOop holder);
duke@435	828	};
duke@435	829
duke@435	830
duke@435	831	// If breakpoints are more numerous than just JVMTI breakpoints,
duke@435	832	// consider compressing this data structure.
duke@435	833	// It is currently a simple linked list defined in methodOop.hpp.
duke@435	834
duke@435	835	class BreakpointInfo;
duke@435	836
duke@435	837
duke@435	838	// A collection point for interesting information about the previous
duke@435	839	// version(s) of an instanceKlass. This class uses weak references to
duke@435	840	// the information so that the information may be collected as needed
duke@435	841	// by the system. A GrowableArray of PreviousVersionNodes is attached
duke@435	842	// to the instanceKlass as needed. See PreviousVersionWalker below.
duke@435	843	class PreviousVersionNode : public CHeapObj {
duke@435	844	private:
duke@435	845	jweak _prev_constant_pool;
duke@435	846	// If the previous version of the instanceKlass doesn't have any
duke@435	847	// EMCP methods, then _prev_EMCP_methods will be NULL. If all the
duke@435	848	// EMCP methods have been collected, then _prev_EMCP_methods can
duke@435	849	// have a length of zero.
duke@435	850	GrowableArray<jweak>* _prev_EMCP_methods;
duke@435	851
duke@435	852	public:
duke@435	853	PreviousVersionNode(jweak prev_constant_pool,
duke@435	854	GrowableArray<jweak>* prev_EMCP_methods);
duke@435	855	~PreviousVersionNode();
duke@435	856	jweak prev_constant_pool() const {
duke@435	857	return _prev_constant_pool;
duke@435	858	}
duke@435	859	GrowableArray<jweak>* prev_EMCP_methods() const {
duke@435	860	return _prev_EMCP_methods;
duke@435	861	}
duke@435	862	};
duke@435	863
duke@435	864
duke@435	865	// A Handle-ized version of PreviousVersionNode.
duke@435	866	class PreviousVersionInfo : public ResourceObj {
duke@435	867	private:
duke@435	868	constantPoolHandle _prev_constant_pool_handle;
duke@435	869	// If the previous version of the instanceKlass doesn't have any
duke@435	870	// EMCP methods, then _prev_EMCP_methods will be NULL. Since the
duke@435	871	// methods cannot be collected while we hold a handle,
duke@435	872	// _prev_EMCP_methods should never have a length of zero.
duke@435	873	GrowableArray<methodHandle>* _prev_EMCP_method_handles;
duke@435	874
duke@435	875	public:
duke@435	876	PreviousVersionInfo(PreviousVersionNode *pv_node);
duke@435	877	~PreviousVersionInfo();
duke@435	878	constantPoolHandle prev_constant_pool_handle() const {
duke@435	879	return _prev_constant_pool_handle;
duke@435	880	}
duke@435	881	GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
duke@435	882	return _prev_EMCP_method_handles;
duke@435	883	}
duke@435	884	};
duke@435	885
duke@435	886
duke@435	887	// Helper object for walking previous versions. This helper cleans up
duke@435	888	// the Handles that it allocates when the helper object is destroyed.
duke@435	889	// The PreviousVersionInfo object returned by next_previous_version()
duke@435	890	// is only valid until a subsequent call to next_previous_version() or
duke@435	891	// the helper object is destroyed.
duke@435	892	class PreviousVersionWalker : public StackObj {
duke@435	893	private:
duke@435	894	GrowableArray<PreviousVersionNode *>* _previous_versions;
duke@435	895	int _current_index;
duke@435	896	// Fields for cleaning up when we are done walking the previous versions:
duke@435	897	// A HandleMark for the PreviousVersionInfo handles:
duke@435	898	HandleMark _hm;
duke@435	899
duke@435	900	// It would be nice to have a ResourceMark field in this helper also,
duke@435	901	// but the ResourceMark code says to be careful to delete handles held
duke@435	902	// in GrowableArrays _before_ deleting the GrowableArray. Since we
duke@435	903	// can't guarantee the order in which the fields are destroyed, we
duke@435	904	// have to let the creator of the PreviousVersionWalker object do
duke@435	905	// the right thing. Also, adding a ResourceMark here causes an
duke@435	906	// include loop.
duke@435	907
duke@435	908	// A pointer to the current info object so we can handle the deletes.
duke@435	909	PreviousVersionInfo * _current_p;
duke@435	910
duke@435	911	public:
duke@435	912	PreviousVersionWalker(instanceKlass *ik);
duke@435	913	~PreviousVersionWalker();
duke@435	914
duke@435	915	// Return the interesting information for the next previous version
duke@435	916	// of the klass. Returns NULL if there are no more previous versions.
duke@435	917	PreviousVersionInfo* next_previous_version();
duke@435	918	};