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src/share/vm/oops/instanceKlass.hpp@7bb995fbd3c0 (annotated)

src/share/vm/oops/instanceKlass.hpp

Thu, 12 Mar 2009 18:16:36 -0700

author

trims

date

Thu, 12 Mar 2009 18:16:36 -0700

changeset 1063

7bb995fbd3c0

parent 866

a45484ea312d

child 1087

4aaa9f5e02a8

child 1100

c89f86385056

permissions

-rw-r--r--

Merge

duke@435	1	/*
xdono@631	2	* Copyright 1997-2008 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;
jrose@866	150	// Host class, which grants its access privileges to this class also.
jrose@866	151	// This is only non-null for an anonymous class (AnonymousClasses enabled).
jrose@866	152	// The host class is either named, or a previously loaded anonymous class.
jrose@866	153	klassOop _host_klass;
duke@435	154	// Class signers.
duke@435	155	objArrayOop _signers;
duke@435	156	// Name of source file containing this klass, NULL if not specified.
duke@435	157	symbolOop _source_file_name;
duke@435	158	// the source debug extension for this klass, NULL if not specified.
duke@435	159	symbolOop _source_debug_extension;
duke@435	160	// inner_classes attribute.
duke@435	161	typeArrayOop _inner_classes;
duke@435	162	// Implementors of this interface (not valid if it overflows)
duke@435	163	klassOop _implementors[implementors_limit];
duke@435	164	// Generic signature, or null if none.
duke@435	165	symbolOop _generic_signature;
duke@435	166	// Annotations for this class, or null if none.
duke@435	167	typeArrayOop _class_annotations;
duke@435	168	// Annotation objects (byte arrays) for fields, or null if no annotations.
duke@435	169	// Indices correspond to entries (not indices) in fields array.
duke@435	170	objArrayOop _fields_annotations;
duke@435	171	// Annotation objects (byte arrays) for methods, or null if no annotations.
duke@435	172	// Index is the idnum, which is initially the same as the methods array index.
duke@435	173	objArrayOop _methods_annotations;
duke@435	174	// Annotation objects (byte arrays) for methods' parameters, 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_parameter_annotations;
duke@435	178	// Annotation objects (byte arrays) for methods' default values, or null if no
duke@435	179	// such annotations.
duke@435	180	// Index is the idnum, which is initially the same as the methods array index.
duke@435	181	objArrayOop _methods_default_annotations;
duke@435	182
duke@435	183	//
duke@435	184	// End of the oop block.
duke@435	185	//
duke@435	186
kvn@600	187	// Number of heapOopSize words used by non-static fields in this klass
kvn@600	188	// (including inherited fields but after header_size()).
coleenp@548	189	int _nonstatic_field_size;
coleenp@548	190	int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
duke@435	191	int _static_oop_field_size;// number of static oop fields in this klass
duke@435	192	int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
duke@435	193	bool _is_marked_dependent; // used for marking during flushing and deoptimization
duke@435	194	bool _rewritten; // methods rewritten.
coleenp@548	195	bool _has_nonstatic_fields; // for sizing with UseCompressedOops
duke@435	196	u2 _minor_version; // minor version number of class file
duke@435	197	u2 _major_version; // major version number of class file
duke@435	198	ClassState _init_state; // state of class
duke@435	199	Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
duke@435	200	int _vtable_len; // length of Java vtable (in words)
duke@435	201	int _itable_len; // length of Java itable (in words)
duke@435	202	ReferenceType _reference_type; // reference type
duke@435	203	OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
duke@435	204	JNIid* _jni_ids; // First JNI identifier for static fields in this class
duke@435	205	jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
duke@435	206	int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
duke@435	207	nmethodBucket* _dependencies; // list of dependent nmethods
duke@435	208	nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
duke@435	209	BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
duke@435	210	int _nof_implementors; // No of implementors of this interface (zero if not an interface)
duke@435	211	// Array of interesting part(s) of the previous version(s) of this
duke@435	212	// instanceKlass. See PreviousVersionWalker below.
duke@435	213	GrowableArray<PreviousVersionNode *>* _previous_versions;
duke@435	214	u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
duke@435	215	u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
duke@435	216	// JVMTI fields can be moved to their own structure - see 6315920
duke@435	217	unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
duke@435	218	jint _cached_class_file_len; // JVMTI: length of above
duke@435	219	JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
duke@435	220	volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
duke@435	221
duke@435	222	// embedded Java vtable follows here
duke@435	223	// embedded Java itables follows here
duke@435	224	// embedded static fields follows here
duke@435	225	// embedded nonstatic oop-map blocks follows here
duke@435	226
duke@435	227	friend class instanceKlassKlass;
duke@435	228	friend class SystemDictionary;
duke@435	229
duke@435	230	public:
coleenp@548	231	bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
coleenp@548	232	void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
coleenp@548	233
duke@435	234	// field sizes
duke@435	235	int nonstatic_field_size() const { return _nonstatic_field_size; }
duke@435	236	void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
duke@435	237
duke@435	238	int static_field_size() const { return _static_field_size; }
duke@435	239	void set_static_field_size(int size) { _static_field_size = size; }
duke@435	240
duke@435	241	int static_oop_field_size() const { return _static_oop_field_size; }
duke@435	242	void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
duke@435	243
duke@435	244	// Java vtable
duke@435	245	int vtable_length() const { return _vtable_len; }
duke@435	246	void set_vtable_length(int len) { _vtable_len = len; }
duke@435	247
duke@435	248	// Java itable
duke@435	249	int itable_length() const { return _itable_len; }
duke@435	250	void set_itable_length(int len) { _itable_len = len; }
duke@435	251
duke@435	252	// array klasses
duke@435	253	klassOop array_klasses() const { return _array_klasses; }
duke@435	254	void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
duke@435	255
duke@435	256	// methods
duke@435	257	objArrayOop methods() const { return _methods; }
duke@435	258	void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
duke@435	259	methodOop method_with_idnum(int idnum);
duke@435	260
duke@435	261	// method ordering
duke@435	262	typeArrayOop method_ordering() const { return _method_ordering; }
duke@435	263	void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
duke@435	264
duke@435	265	// interfaces
duke@435	266	objArrayOop local_interfaces() const { return _local_interfaces; }
duke@435	267	void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
duke@435	268	objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
duke@435	269	void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
duke@435	270
duke@435	271	// fields
duke@435	272	// Field info extracted from the class file and stored
duke@435	273	// as an array of 7 shorts
duke@435	274	enum FieldOffset {
duke@435	275	access_flags_offset = 0,
duke@435	276	name_index_offset = 1,
duke@435	277	signature_index_offset = 2,
duke@435	278	initval_index_offset = 3,
duke@435	279	low_offset = 4,
duke@435	280	high_offset = 5,
duke@435	281	generic_signature_offset = 6,
duke@435	282	next_offset = 7
duke@435	283	};
duke@435	284
duke@435	285	typeArrayOop fields() const { return _fields; }
duke@435	286	int offset_from_fields( int index ) const {
duke@435	287	return build_int_from_shorts( fields()->ushort_at(index + low_offset),
duke@435	288	fields()->ushort_at(index + high_offset) );
duke@435	289	}
duke@435	290
duke@435	291	void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
duke@435	292
duke@435	293	// inner classes
duke@435	294	typeArrayOop inner_classes() const { return _inner_classes; }
duke@435	295	void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
duke@435	296
duke@435	297	enum InnerClassAttributeOffset {
duke@435	298	// From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
duke@435	299	inner_class_inner_class_info_offset = 0,
duke@435	300	inner_class_outer_class_info_offset = 1,
duke@435	301	inner_class_inner_name_offset = 2,
duke@435	302	inner_class_access_flags_offset = 3,
duke@435	303	inner_class_next_offset = 4
duke@435	304	};
duke@435	305
duke@435	306	// package
duke@435	307	bool is_same_class_package(klassOop class2);
duke@435	308	bool is_same_class_package(oop classloader2, symbolOop classname2);
duke@435	309	static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
duke@435	310
duke@435	311	// initialization state
duke@435	312	bool is_loaded() const { return _init_state >= loaded; }
duke@435	313	bool is_linked() const { return _init_state >= linked; }
duke@435	314	bool is_initialized() const { return _init_state == fully_initialized; }
duke@435	315	bool is_not_initialized() const { return _init_state < being_initialized; }
duke@435	316	bool is_being_initialized() const { return _init_state == being_initialized; }
duke@435	317	bool is_in_error_state() const { return _init_state == initialization_error; }
duke@435	318	bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
duke@435	319	int get_init_state() { return _init_state; } // Useful for debugging
duke@435	320	bool is_rewritten() const { return _rewritten; }
duke@435	321
duke@435	322	// marking
duke@435	323	bool is_marked_dependent() const { return _is_marked_dependent; }
duke@435	324	void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
duke@435	325
duke@435	326	// initialization (virtuals from Klass)
duke@435	327	bool should_be_initialized() const; // means that initialize should be called
duke@435	328	void initialize(TRAPS);
duke@435	329	void link_class(TRAPS);
duke@435	330	bool link_class_or_fail(TRAPS); // returns false on failure
duke@435	331	void unlink_class();
duke@435	332	void rewrite_class(TRAPS);
duke@435	333	methodOop class_initializer();
duke@435	334
duke@435	335	// set the class to initialized if no static initializer is present
duke@435	336	void eager_initialize(Thread *thread);
duke@435	337
duke@435	338	// reference type
duke@435	339	ReferenceType reference_type() const { return _reference_type; }
duke@435	340	void set_reference_type(ReferenceType t) { _reference_type = t; }
duke@435	341
duke@435	342	// find local field, returns true if found
duke@435	343	bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	344	// find field in direct superinterfaces, returns the interface in which the field is defined
duke@435	345	klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	346	// find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
duke@435	347	klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
duke@435	348	// find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
duke@435	349	klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
duke@435	350
duke@435	351	// find a non-static or static field given its offset within the class.
duke@435	352	bool contains_field_offset(int offset) {
coleenp@548	353	return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
duke@435	354	}
duke@435	355
duke@435	356	bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
duke@435	357	bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
duke@435	358
duke@435	359	// find a local method (returns NULL if not found)
duke@435	360	methodOop find_method(symbolOop name, symbolOop signature) const;
duke@435	361	static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
duke@435	362
duke@435	363	// lookup operation (returns NULL if not found)
duke@435	364	methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
duke@435	365
duke@435	366	// lookup a method in all the interfaces that this class implements
duke@435	367	// (returns NULL if not found)
duke@435	368	methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
duke@435	369
duke@435	370	// constant pool
duke@435	371	constantPoolOop constants() const { return _constants; }
duke@435	372	void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
duke@435	373
duke@435	374	// class loader
duke@435	375	oop class_loader() const { return _class_loader; }
duke@435	376	void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
duke@435	377
duke@435	378	// protection domain
duke@435	379	oop protection_domain() { return _protection_domain; }
duke@435	380	void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
duke@435	381
jrose@866	382	// host class
jrose@866	383	oop host_klass() const { return _host_klass; }
jrose@866	384	void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
jrose@866	385	bool is_anonymous() const { return _host_klass != NULL; }
jrose@866	386
duke@435	387	// signers
duke@435	388	objArrayOop signers() const { return _signers; }
duke@435	389	void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
duke@435	390
duke@435	391	// source file name
duke@435	392	symbolOop source_file_name() const { return _source_file_name; }
duke@435	393	void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
duke@435	394
duke@435	395	// minor and major version numbers of class file
duke@435	396	u2 minor_version() const { return _minor_version; }
duke@435	397	void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
duke@435	398	u2 major_version() const { return _major_version; }
duke@435	399	void set_major_version(u2 major_version) { _major_version = major_version; }
duke@435	400
duke@435	401	// source debug extension
duke@435	402	symbolOop source_debug_extension() const { return _source_debug_extension; }
duke@435	403	void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
duke@435	404
duke@435	405	// nonstatic oop-map blocks
duke@435	406	int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
duke@435	407	void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
duke@435	408
duke@435	409	// RedefineClasses() support for previous versions:
duke@435	410	void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
duke@435	411	int emcp_method_count);
duke@435	412	bool has_previous_version() const;
duke@435	413	void init_previous_versions() {
duke@435	414	_previous_versions = NULL;
duke@435	415	}
duke@435	416	GrowableArray<PreviousVersionNode *>* previous_versions() const {
duke@435	417	return _previous_versions;
duke@435	418	}
duke@435	419
duke@435	420	// JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
duke@435	421	void set_cached_class_file(unsigned char *class_file_bytes,
duke@435	422	jint class_file_len) { _cached_class_file_len = class_file_len;
duke@435	423	_cached_class_file_bytes = class_file_bytes; }
duke@435	424	jint get_cached_class_file_len() { return _cached_class_file_len; }
duke@435	425	unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
duke@435	426
duke@435	427	// JVMTI: Support for caching of field indices, types, and offsets
duke@435	428	void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
duke@435	429	_jvmti_cached_class_field_map = descriptor;
duke@435	430	}
duke@435	431	JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
duke@435	432	return _jvmti_cached_class_field_map;
duke@435	433	}
duke@435	434
duke@435	435	// for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
duke@435	436	inline u2 next_method_idnum();
duke@435	437	void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
duke@435	438
duke@435	439	// generics support
duke@435	440	symbolOop generic_signature() const { return _generic_signature; }
duke@435	441	void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
duke@435	442	u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
duke@435	443	u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
duke@435	444	void set_enclosing_method_indices(u2 class_index,
duke@435	445	u2 method_index) { _enclosing_method_class_index = class_index;
duke@435	446	_enclosing_method_method_index = method_index; }
duke@435	447
duke@435	448	// jmethodID support
dcubed@484	449	static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum,
dcubed@484	450	jmethodID new_id, jmethodID* new_jmeths);
duke@435	451	static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
duke@435	452	jmethodID jmethod_id_or_null(methodOop method);
duke@435	453
duke@435	454	// cached itable index support
duke@435	455	void set_cached_itable_index(size_t idnum, int index);
duke@435	456	int cached_itable_index(size_t idnum);
duke@435	457
duke@435	458	// annotations support
duke@435	459	typeArrayOop class_annotations() const { return _class_annotations; }
duke@435	460	objArrayOop fields_annotations() const { return _fields_annotations; }
duke@435	461	objArrayOop methods_annotations() const { return _methods_annotations; }
duke@435	462	objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
duke@435	463	objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
duke@435	464	void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
duke@435	465	void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
duke@435	466	void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
duke@435	467	void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
duke@435	468	void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
duke@435	469	typeArrayOop get_method_annotations_of(int idnum)
duke@435	470	{ return get_method_annotations_from(idnum, _methods_annotations); }
duke@435	471	typeArrayOop get_method_parameter_annotations_of(int idnum)
duke@435	472	{ return get_method_annotations_from(idnum, _methods_parameter_annotations); }
duke@435	473	typeArrayOop get_method_default_annotations_of(int idnum)
duke@435	474	{ return get_method_annotations_from(idnum, _methods_default_annotations); }
duke@435	475	void set_method_annotations_of(int idnum, typeArrayOop anno)
duke@435	476	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	477	void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
duke@435	478	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	479	void set_method_default_annotations_of(int idnum, typeArrayOop anno)
duke@435	480	{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
duke@435	481
duke@435	482	// allocation
duke@435	483	DEFINE_ALLOCATE_PERMANENT(instanceKlass);
duke@435	484	instanceOop allocate_instance(TRAPS);
duke@435	485	instanceOop allocate_permanent_instance(TRAPS);
duke@435	486
duke@435	487	// additional member function to return a handle
duke@435	488	instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
duke@435	489
duke@435	490	objArrayOop allocate_objArray(int n, int length, TRAPS);
duke@435	491	// Helper function
duke@435	492	static instanceOop register_finalizer(instanceOop i, TRAPS);
duke@435	493
duke@435	494	// Check whether reflection/jni/jvm code is allowed to instantiate this class;
duke@435	495	// if not, throw either an Error or an Exception.
duke@435	496	virtual void check_valid_for_instantiation(bool throwError, TRAPS);
duke@435	497
duke@435	498	// initialization
duke@435	499	void call_class_initializer(TRAPS);
duke@435	500	void set_initialization_state_and_notify(ClassState state, TRAPS);
duke@435	501
duke@435	502	// OopMapCache support
duke@435	503	OopMapCache* oop_map_cache() { return _oop_map_cache; }
duke@435	504	void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
duke@435	505	void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
duke@435	506
duke@435	507	// JNI identifier support (for static fields - for jni performance)
duke@435	508	JNIid* jni_ids() { return _jni_ids; }
duke@435	509	void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
duke@435	510	JNIid* jni_id_for(int offset);
duke@435	511
duke@435	512	// maintenance of deoptimization dependencies
duke@435	513	int mark_dependent_nmethods(DepChange& changes);
duke@435	514	void add_dependent_nmethod(nmethod* nm);
duke@435	515	void remove_dependent_nmethod(nmethod* nm);
duke@435	516
duke@435	517	// On-stack replacement support
duke@435	518	nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
duke@435	519	void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
duke@435	520	void add_osr_nmethod(nmethod* n);
duke@435	521	void remove_osr_nmethod(nmethod* n);
duke@435	522	nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
duke@435	523
duke@435	524	// Breakpoint support (see methods on methodOop for details)
duke@435	525	BreakpointInfo* breakpoints() const { return _breakpoints; };
duke@435	526	void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
duke@435	527
duke@435	528	// support for stub routines
duke@435	529	static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
duke@435	530	static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
duke@435	531
duke@435	532	// subclass/subinterface checks
duke@435	533	bool implements_interface(klassOop k) const;
duke@435	534
duke@435	535	// Access to implementors of an interface. We only store the count
duke@435	536	// of implementors, and in case, there are only a few
duke@435	537	// implementors, we store them in a short list.
duke@435	538	// This accessor returns NULL if we walk off the end of the list.
duke@435	539	klassOop implementor(int i) const {
duke@435	540	return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
duke@435	541	}
duke@435	542	int nof_implementors() const { return _nof_implementors; }
duke@435	543	void add_implementor(klassOop k); // k is a new class that implements this interface
duke@435	544	void init_implementor(); // initialize
duke@435	545
duke@435	546	// link this class into the implementors list of every interface it implements
duke@435	547	void process_interfaces(Thread *thread);
duke@435	548
duke@435	549	// virtual operations from Klass
duke@435	550	bool is_leaf_class() const { return _subklass == NULL; }
duke@435	551	objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
duke@435	552	bool compute_is_subtype_of(klassOop k);
duke@435	553	bool can_be_primary_super_slow() const;
duke@435	554	klassOop java_super() const { return super(); }
duke@435	555	int oop_size(oop obj) const { return size_helper(); }
duke@435	556	int klass_oop_size() const { return object_size(); }
duke@435	557	bool oop_is_instance_slow() const { return true; }
duke@435	558
duke@435	559	// Iterators
duke@435	560	void do_local_static_fields(FieldClosure* cl);
duke@435	561	void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
duke@435	562	void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
duke@435	563
duke@435	564	void methods_do(void f(methodOop method));
duke@435	565	void array_klasses_do(void f(klassOop k));
duke@435	566	void with_array_klasses_do(void f(klassOop k));
duke@435	567	bool super_types_do(SuperTypeClosure* blk);
duke@435	568
duke@435	569	// Casting from klassOop
duke@435	570	static instanceKlass* cast(klassOop k) {
duke@435	571	Klass* kp = k->klass_part();
duke@435	572	assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
duke@435	573	return (instanceKlass*) kp;
duke@435	574	}
duke@435	575
duke@435	576	// Sizing (in words)
duke@435	577	static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
duke@435	578	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	579	static int vtable_start_offset() { return header_size(); }
duke@435	580	static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
duke@435	581	static int object_size(int extra) { return align_object_size(header_size() + extra); }
duke@435	582
duke@435	583	intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
duke@435	584	intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
duke@435	585	int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
duke@435	586
coleenp@548	587	// Static field offset is an offset into the Heap, should be converted by
coleenp@548	588	// based on UseCompressedOop for traversal
coleenp@548	589	HeapWord* start_of_static_fields() const {
coleenp@548	590	return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
coleenp@548	591	}
coleenp@548	592
duke@435	593	intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
duke@435	594
coleenp@548	595	int offset_of_static_fields() const {
coleenp@548	596	return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
coleenp@548	597	}
coleenp@548	598
coleenp@548	599	OopMapBlock* start_of_nonstatic_oop_maps() const {
coleenp@548	600	return (OopMapBlock*) (start_of_static_fields() + static_field_size());
coleenp@548	601	}
duke@435	602
duke@435	603	// Allocation profiling support
duke@435	604	juint alloc_size() const { return _alloc_count * size_helper(); }
duke@435	605	void set_alloc_size(juint n) {}
duke@435	606
duke@435	607	// Use this to return the size of an instance in heap words:
duke@435	608	int size_helper() const {
duke@435	609	return layout_helper_to_size_helper(layout_helper());
duke@435	610	}
duke@435	611
duke@435	612	// This bit is initialized in classFileParser.cpp.
duke@435	613	// It is false under any of the following conditions:
duke@435	614	// - the class is abstract (including any interface)
duke@435	615	// - the class has a finalizer (if !RegisterFinalizersAtInit)
duke@435	616	// - the class size is larger than FastAllocateSizeLimit
duke@435	617	// - the class is java/lang/Class, which cannot be allocated directly
duke@435	618	bool can_be_fastpath_allocated() const {
duke@435	619	return !layout_helper_needs_slow_path(layout_helper());
duke@435	620	}
duke@435	621
duke@435	622	// Java vtable/itable
duke@435	623	klassVtable* vtable() const; // return new klassVtable wrapper
duke@435	624	inline methodOop method_at_vtable(int index);
duke@435	625	klassItable* itable() const; // return new klassItable wrapper
duke@435	626	methodOop method_at_itable(klassOop holder, int index, TRAPS);
duke@435	627
duke@435	628	// Garbage collection
duke@435	629	void oop_follow_contents(oop obj);
duke@435	630	void follow_static_fields();
duke@435	631	void adjust_static_fields();
duke@435	632	int oop_adjust_pointers(oop obj);
duke@435	633	bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
duke@435	634	// Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
duke@435	635
duke@435	636	void follow_weak_klass_links(
duke@435	637	BoolObjectClosure* is_alive, OopClosure* keep_alive);
duke@435	638	void release_C_heap_structures();
duke@435	639
duke@435	640	// Parallel Scavenge and Parallel Old
duke@435	641	PARALLEL_GC_DECLS
duke@435	642
duke@435	643	#ifndef SERIALGC
duke@435	644	// Parallel Scavenge
duke@435	645	void copy_static_fields(PSPromotionManager* pm);
duke@435	646	void push_static_fields(PSPromotionManager* pm);
duke@435	647
duke@435	648	// Parallel Old
duke@435	649	void follow_static_fields(ParCompactionManager* cm);
duke@435	650	void copy_static_fields(ParCompactionManager* cm);
duke@435	651	void update_static_fields();
duke@435	652	void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
duke@435	653	#endif // SERIALGC
duke@435	654
duke@435	655	// Naming
duke@435	656	char* signature_name() const;
duke@435	657
duke@435	658	// Iterators
duke@435	659	int oop_oop_iterate(oop obj, OopClosure* blk) {
duke@435	660	return oop_oop_iterate_v(obj, blk);
duke@435	661	}
duke@435	662
duke@435	663	int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
duke@435	664	return oop_oop_iterate_v_m(obj, blk, mr);
duke@435	665	}
duke@435	666
ysr@777	667	#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
ysr@777	668	int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
ysr@777	669	int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
duke@435	670	MemRegion mr);
duke@435	671
duke@435	672	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
ysr@777	673	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
ysr@777	674
ysr@777	675	#ifndef SERIALGC
ysr@777	676	#define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
ysr@777	677	int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
ysr@777	678
ysr@777	679	ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
ysr@777	680	ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
ysr@777	681	#endif // !SERIALGC
duke@435	682
duke@435	683	void iterate_static_fields(OopClosure* closure);
duke@435	684	void iterate_static_fields(OopClosure* closure, MemRegion mr);
duke@435	685
duke@435	686	private:
duke@435	687	// initialization state
duke@435	688	#ifdef ASSERT
duke@435	689	void set_init_state(ClassState state);
duke@435	690	#else
duke@435	691	void set_init_state(ClassState state) { _init_state = state; }
duke@435	692	#endif
duke@435	693	void set_rewritten() { _rewritten = true; }
duke@435	694	void set_init_thread(Thread *thread) { _init_thread = thread; }
duke@435	695
duke@435	696	u2 idnum_allocated_count() const { return _idnum_allocated_count; }
duke@435	697	jmethodID* methods_jmethod_ids_acquire() const
duke@435	698	{ return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
duke@435	699	void release_set_methods_jmethod_ids(jmethodID* jmeths)
duke@435	700	{ OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
duke@435	701
duke@435	702	int* methods_cached_itable_indices_acquire() const
duke@435	703	{ return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
duke@435	704	void release_set_methods_cached_itable_indices(int* indices)
duke@435	705	{ OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
duke@435	706
duke@435	707	inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
duke@435	708	void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
duke@435	709	void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
duke@435	710
duke@435	711	// Offsets for memory management
duke@435	712	oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
duke@435	713	oop* adr_methods() const { return (oop*)&this->_methods;}
duke@435	714	oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
duke@435	715	oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
duke@435	716	oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
duke@435	717	oop* adr_fields() const { return (oop*)&this->_fields;}
duke@435	718	oop* adr_constants() const { return (oop*)&this->_constants;}
duke@435	719	oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
duke@435	720	oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
jrose@866	721	oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
duke@435	722	oop* adr_signers() const { return (oop*)&this->_signers;}
duke@435	723	oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
duke@435	724	oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
duke@435	725	oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
duke@435	726	oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
duke@435	727	oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
duke@435	728	oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
duke@435	729	oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
duke@435	730	oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
duke@435	731	oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
duke@435	732	oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
duke@435	733	oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
duke@435	734	oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
duke@435	735
duke@435	736	// Static methods that are used to implement member methods where an exposed this pointer
duke@435	737	// is needed due to possible GCs
duke@435	738	static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
duke@435	739	static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
duke@435	740	static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
duke@435	741	static void eager_initialize_impl (instanceKlassHandle this_oop);
duke@435	742	static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
duke@435	743	static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
duke@435	744	static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
duke@435	745	static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
duke@435	746	/* jni_id_for_impl for jfieldID only */
duke@435	747	static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
duke@435	748
duke@435	749	// Returns the array class for the n'th dimension
duke@435	750	klassOop array_klass_impl(bool or_null, int n, TRAPS);
duke@435	751
duke@435	752	// Returns the array class with this class as element type
duke@435	753	klassOop array_klass_impl(bool or_null, TRAPS);
duke@435	754
duke@435	755	public:
duke@435	756	// sharing support
duke@435	757	virtual void remove_unshareable_info();
duke@435	758	void field_names_and_sigs_iterate(OopClosure* closure);
duke@435	759
duke@435	760	// jvm support
duke@435	761	jint compute_modifier_flags(TRAPS) const;
duke@435	762
duke@435	763	public:
duke@435	764	// JVMTI support
duke@435	765	jint jvmti_class_status() const;
duke@435	766
duke@435	767	#ifndef PRODUCT
duke@435	768	public:
duke@435	769	// Printing
duke@435	770	void oop_print_on (oop obj, outputStream* st);
duke@435	771	void oop_print_value_on(oop obj, outputStream* st);
duke@435	772
duke@435	773	void print_dependent_nmethods(bool verbose = false);
duke@435	774	bool is_dependent_nmethod(nmethod* nm);
duke@435	775	#endif
duke@435	776
duke@435	777	public:
duke@435	778	// Verification
duke@435	779	const char* internal_name() const;
duke@435	780	void oop_verify_on(oop obj, outputStream* st);
duke@435	781
duke@435	782	#ifndef PRODUCT
duke@435	783	static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
duke@435	784	#endif
duke@435	785	};
duke@435	786
duke@435	787	inline methodOop instanceKlass::method_at_vtable(int index) {
duke@435	788	#ifndef PRODUCT
duke@435	789	assert(index >= 0, "valid vtable index");
duke@435	790	if (DebugVtables) {
duke@435	791	verify_vtable_index(index);
duke@435	792	}
duke@435	793	#endif
duke@435	794	vtableEntry* ve = (vtableEntry*)start_of_vtable();
duke@435	795	return ve[index].method();
duke@435	796	}
duke@435	797
duke@435	798	inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
duke@435	799	if (annos == NULL || annos->length() <= idnum) {
duke@435	800	return NULL;
duke@435	801	}
duke@435	802	return typeArrayOop(annos->obj_at(idnum));
duke@435	803	}
duke@435	804
duke@435	805	// for adding methods
duke@435	806	// UNSET_IDNUM return means no more ids available
duke@435	807	inline u2 instanceKlass::next_method_idnum() {
duke@435	808	if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
duke@435	809	return constMethodOopDesc::UNSET_IDNUM; // no more ids available
duke@435	810	} else {
duke@435	811	return _idnum_allocated_count++;
duke@435	812	}
duke@435	813	}
duke@435	814
duke@435	815
duke@435	816	// ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
duke@435	817
duke@435	818	class OopMapBlock VALUE_OBJ_CLASS_SPEC {
duke@435	819	private:
duke@435	820	jushort _offset; // Offset of first oop in oop-map block
duke@435	821	jushort _length; // Length of oop-map block
duke@435	822	public:
duke@435	823	// Accessors
duke@435	824	jushort offset() const { return _offset; }
duke@435	825	void set_offset(jushort offset) { _offset = offset; }
duke@435	826
duke@435	827	jushort length() const { return _length; }
duke@435	828	void set_length(jushort length) { _length = length; }
duke@435	829	};
duke@435	830
duke@435	831	/* JNIid class for jfieldIDs only */
duke@435	832	class JNIid: public CHeapObj {
duke@435	833	friend class VMStructs;
duke@435	834	private:
duke@435	835	klassOop _holder;
duke@435	836	JNIid* _next;
duke@435	837	int _offset;
duke@435	838	#ifdef ASSERT
duke@435	839	bool _is_static_field_id;
duke@435	840	#endif
duke@435	841
duke@435	842	public:
duke@435	843	// Accessors
duke@435	844	klassOop holder() const { return _holder; }
duke@435	845	int offset() const { return _offset; }
duke@435	846	JNIid* next() { return _next; }
duke@435	847	// Constructor
duke@435	848	JNIid(klassOop holder, int offset, JNIid* next);
duke@435	849	// Identifier lookup
duke@435	850	JNIid* find(int offset);
duke@435	851
duke@435	852	// Garbage collection support
duke@435	853	oop* holder_addr() { return (oop*)&_holder; }
duke@435	854	void oops_do(OopClosure* f);
duke@435	855	static void deallocate(JNIid* id);
duke@435	856	// Debugging
duke@435	857	#ifdef ASSERT
duke@435	858	bool is_static_field_id() const { return _is_static_field_id; }
duke@435	859	void set_is_static_field_id() { _is_static_field_id = true; }
duke@435	860	#endif
duke@435	861	void verify(klassOop holder);
duke@435	862	};
duke@435	863
duke@435	864
duke@435	865	// If breakpoints are more numerous than just JVMTI breakpoints,
duke@435	866	// consider compressing this data structure.
duke@435	867	// It is currently a simple linked list defined in methodOop.hpp.
duke@435	868
duke@435	869	class BreakpointInfo;
duke@435	870
duke@435	871
duke@435	872	// A collection point for interesting information about the previous
duke@435	873	// version(s) of an instanceKlass. This class uses weak references to
duke@435	874	// the information so that the information may be collected as needed
dcubed@482	875	// by the system. If the information is shared, then a regular
dcubed@482	876	// reference must be used because a weak reference would be seen as
dcubed@482	877	// collectible. A GrowableArray of PreviousVersionNodes is attached
duke@435	878	// to the instanceKlass as needed. See PreviousVersionWalker below.
duke@435	879	class PreviousVersionNode : public CHeapObj {
duke@435	880	private:
dcubed@482	881	// A shared ConstantPool is never collected so we'll always have
dcubed@482	882	// a reference to it so we can update items in the cache. We'll
dcubed@482	883	// have a weak reference to a non-shared ConstantPool until all
dcubed@482	884	// of the methods (EMCP or obsolete) have been collected; the
dcubed@482	885	// non-shared ConstantPool becomes collectible at that point.
dcubed@482	886	jobject _prev_constant_pool; // regular or weak reference
dcubed@482	887	bool _prev_cp_is_weak; // true if not a shared ConstantPool
dcubed@482	888
duke@435	889	// If the previous version of the instanceKlass doesn't have any
duke@435	890	// EMCP methods, then _prev_EMCP_methods will be NULL. If all the
duke@435	891	// EMCP methods have been collected, then _prev_EMCP_methods can
duke@435	892	// have a length of zero.
duke@435	893	GrowableArray<jweak>* _prev_EMCP_methods;
duke@435	894
duke@435	895	public:
dcubed@482	896	PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
duke@435	897	GrowableArray<jweak>* prev_EMCP_methods);
duke@435	898	~PreviousVersionNode();
dcubed@482	899	jobject prev_constant_pool() const {
duke@435	900	return _prev_constant_pool;
duke@435	901	}
duke@435	902	GrowableArray<jweak>* prev_EMCP_methods() const {
duke@435	903	return _prev_EMCP_methods;
duke@435	904	}
duke@435	905	};
duke@435	906
duke@435	907
duke@435	908	// A Handle-ized version of PreviousVersionNode.
duke@435	909	class PreviousVersionInfo : public ResourceObj {
duke@435	910	private:
duke@435	911	constantPoolHandle _prev_constant_pool_handle;
duke@435	912	// If the previous version of the instanceKlass doesn't have any
duke@435	913	// EMCP methods, then _prev_EMCP_methods will be NULL. Since the
duke@435	914	// methods cannot be collected while we hold a handle,
duke@435	915	// _prev_EMCP_methods should never have a length of zero.
duke@435	916	GrowableArray<methodHandle>* _prev_EMCP_method_handles;
duke@435	917
duke@435	918	public:
duke@435	919	PreviousVersionInfo(PreviousVersionNode *pv_node);
duke@435	920	~PreviousVersionInfo();
duke@435	921	constantPoolHandle prev_constant_pool_handle() const {
duke@435	922	return _prev_constant_pool_handle;
duke@435	923	}
duke@435	924	GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
duke@435	925	return _prev_EMCP_method_handles;
duke@435	926	}
duke@435	927	};
duke@435	928
duke@435	929
duke@435	930	// Helper object for walking previous versions. This helper cleans up
duke@435	931	// the Handles that it allocates when the helper object is destroyed.
duke@435	932	// The PreviousVersionInfo object returned by next_previous_version()
duke@435	933	// is only valid until a subsequent call to next_previous_version() or
duke@435	934	// the helper object is destroyed.
duke@435	935	class PreviousVersionWalker : public StackObj {
duke@435	936	private:
duke@435	937	GrowableArray<PreviousVersionNode *>* _previous_versions;
duke@435	938	int _current_index;
duke@435	939	// Fields for cleaning up when we are done walking the previous versions:
duke@435	940	// A HandleMark for the PreviousVersionInfo handles:
duke@435	941	HandleMark _hm;
duke@435	942
duke@435	943	// It would be nice to have a ResourceMark field in this helper also,
duke@435	944	// but the ResourceMark code says to be careful to delete handles held
duke@435	945	// in GrowableArrays _before_ deleting the GrowableArray. Since we
duke@435	946	// can't guarantee the order in which the fields are destroyed, we
duke@435	947	// have to let the creator of the PreviousVersionWalker object do
duke@435	948	// the right thing. Also, adding a ResourceMark here causes an
duke@435	949	// include loop.
duke@435	950
duke@435	951	// A pointer to the current info object so we can handle the deletes.
duke@435	952	PreviousVersionInfo * _current_p;
duke@435	953
duke@435	954	public:
duke@435	955	PreviousVersionWalker(instanceKlass *ik);
duke@435	956	~PreviousVersionWalker();
duke@435	957
duke@435	958	// Return the interesting information for the next previous version
duke@435	959	// of the klass. Returns NULL if there are no more previous versions.
duke@435	960	PreviousVersionInfo* next_previous_version();
duke@435	961	};