Fri, 20 Mar 2009 23:19:36 -0700
6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // An instanceKlass is the VM level representation of a Java class.
26 // It contains all information needed for at class at execution runtime.
28 // instanceKlass layout:
29 // [header ] klassOop
30 // [klass pointer ] klassOop
31 // [C++ vtbl pointer ] Klass
32 // [subtype cache ] Klass
33 // [instance size ] Klass
34 // [java mirror ] Klass
35 // [super ] Klass
36 // [access_flags ] Klass
37 // [name ] Klass
38 // [first subklass ] Klass
39 // [next sibling ] Klass
40 // [array klasses ]
41 // [methods ]
42 // [local interfaces ]
43 // [transitive interfaces ]
44 // [number of implementors ]
45 // [implementors ] klassOop[2]
46 // [fields ]
47 // [constants ]
48 // [class loader ]
49 // [protection domain ]
50 // [signers ]
51 // [source file name ]
52 // [inner classes ]
53 // [static field size ]
54 // [nonstatic field size ]
55 // [static oop fields size ]
56 // [nonstatic oop maps size ]
57 // [has finalize method ]
58 // [deoptimization mark bit ]
59 // [initialization state ]
60 // [initializing thread ]
61 // [Java vtable length ]
62 // [oop map cache (stack maps) ]
63 // [EMBEDDED Java vtable ] size in words = vtable_len
64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size
65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
67 //
68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
69 // where oops are located in instances of this klass.
72 // forward declaration for class -- see below for definition
73 class SuperTypeClosure;
74 class OopMapBlock;
75 class JNIid;
76 class jniIdMapBase;
77 class BreakpointInfo;
78 class fieldDescriptor;
79 class DepChange;
80 class nmethodBucket;
81 class PreviousVersionNode;
82 class JvmtiCachedClassFieldMap;
84 // This is used in iterators below.
85 class FieldClosure: public StackObj {
86 public:
87 virtual void do_field(fieldDescriptor* fd) = 0;
88 };
90 #ifndef PRODUCT
91 // Print fields.
92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
93 class FieldPrinter: public FieldClosure {
94 oop _obj;
95 outputStream* _st;
96 public:
97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
98 void do_field(fieldDescriptor* fd);
99 };
100 #endif // !PRODUCT
102 class instanceKlass: public Klass {
103 friend class VMStructs;
104 public:
105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
106 // of the class loading & initialization procedure, and the use of the states.
107 enum ClassState {
108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
109 allocated, // allocated (but not yet linked)
110 loaded, // loaded and inserted in class hierarchy (but not linked yet)
111 linked, // successfully linked/verified (but not initialized yet)
112 being_initialized, // currently running class initializer
113 fully_initialized, // initialized (successfull final state)
114 initialization_error // error happened during initialization
115 };
117 public:
118 oop* oop_block_beg() const { return adr_array_klasses(); }
119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
121 enum {
122 implementors_limit = 2 // how many implems can we track?
123 };
125 protected:
126 //
127 // The oop block. See comment in klass.hpp before making changes.
128 //
130 // Array classes holding elements of this class.
131 klassOop _array_klasses;
132 // Method array.
133 objArrayOop _methods;
134 // Int array containing the original order of method in the class file (for
135 // JVMTI).
136 typeArrayOop _method_ordering;
137 // Interface (klassOops) this class declares locally to implement.
138 objArrayOop _local_interfaces;
139 // Interface (klassOops) this class implements transitively.
140 objArrayOop _transitive_interfaces;
141 // Instance and static variable information, 5-tuples of shorts [access, name
142 // index, sig index, initval index, offset].
143 typeArrayOop _fields;
144 // Constant pool for this class.
145 constantPoolOop _constants;
146 // Class loader used to load this class, NULL if VM loader used.
147 oop _class_loader;
148 // Protection domain.
149 oop _protection_domain;
150 // Host class, which grants its access privileges to this class also.
151 // This is only non-null for an anonymous class (AnonymousClasses enabled).
152 // The host class is either named, or a previously loaded anonymous class.
153 klassOop _host_klass;
154 // Class signers.
155 objArrayOop _signers;
156 // Name of source file containing this klass, NULL if not specified.
157 symbolOop _source_file_name;
158 // the source debug extension for this klass, NULL if not specified.
159 symbolOop _source_debug_extension;
160 // inner_classes attribute.
161 typeArrayOop _inner_classes;
162 // Implementors of this interface (not valid if it overflows)
163 klassOop _implementors[implementors_limit];
164 // Generic signature, or null if none.
165 symbolOop _generic_signature;
166 // Annotations for this class, or null if none.
167 typeArrayOop _class_annotations;
168 // Annotation objects (byte arrays) for fields, or null if no annotations.
169 // Indices correspond to entries (not indices) in fields array.
170 objArrayOop _fields_annotations;
171 // Annotation objects (byte arrays) for methods, or null if no annotations.
172 // Index is the idnum, which is initially the same as the methods array index.
173 objArrayOop _methods_annotations;
174 // Annotation objects (byte arrays) for methods' parameters, or null if no
175 // such annotations.
176 // Index is the idnum, which is initially the same as the methods array index.
177 objArrayOop _methods_parameter_annotations;
178 // Annotation objects (byte arrays) for methods' default values, or null if no
179 // such annotations.
180 // Index is the idnum, which is initially the same as the methods array index.
181 objArrayOop _methods_default_annotations;
183 //
184 // End of the oop block.
185 //
187 // Number of heapOopSize words used by non-static fields in this klass
188 // (including inherited fields but after header_size()).
189 int _nonstatic_field_size;
190 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
191 int _static_oop_field_size;// number of static oop fields in this klass
192 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
193 bool _is_marked_dependent; // used for marking during flushing and deoptimization
194 bool _rewritten; // methods rewritten.
195 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
196 u2 _minor_version; // minor version number of class file
197 u2 _major_version; // major version number of class file
198 ClassState _init_state; // state of class
199 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
200 int _vtable_len; // length of Java vtable (in words)
201 int _itable_len; // length of Java itable (in words)
202 ReferenceType _reference_type; // reference type
203 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
204 JNIid* _jni_ids; // First JNI identifier for static fields in this class
205 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
206 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
207 nmethodBucket* _dependencies; // list of dependent nmethods
208 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
209 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
210 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
211 // Array of interesting part(s) of the previous version(s) of this
212 // instanceKlass. See PreviousVersionWalker below.
213 GrowableArray<PreviousVersionNode *>* _previous_versions;
214 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
215 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
216 // JVMTI fields can be moved to their own structure - see 6315920
217 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
218 jint _cached_class_file_len; // JVMTI: length of above
219 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
220 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
222 // embedded Java vtable follows here
223 // embedded Java itables follows here
224 // embedded static fields follows here
225 // embedded nonstatic oop-map blocks follows here
227 friend class instanceKlassKlass;
228 friend class SystemDictionary;
230 public:
231 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
232 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
234 // field sizes
235 int nonstatic_field_size() const { return _nonstatic_field_size; }
236 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
238 int static_field_size() const { return _static_field_size; }
239 void set_static_field_size(int size) { _static_field_size = size; }
241 int static_oop_field_size() const { return _static_oop_field_size; }
242 void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
244 // Java vtable
245 int vtable_length() const { return _vtable_len; }
246 void set_vtable_length(int len) { _vtable_len = len; }
248 // Java itable
249 int itable_length() const { return _itable_len; }
250 void set_itable_length(int len) { _itable_len = len; }
252 // array klasses
253 klassOop array_klasses() const { return _array_klasses; }
254 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
256 // methods
257 objArrayOop methods() const { return _methods; }
258 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
259 methodOop method_with_idnum(int idnum);
261 // method ordering
262 typeArrayOop method_ordering() const { return _method_ordering; }
263 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
265 // interfaces
266 objArrayOop local_interfaces() const { return _local_interfaces; }
267 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
268 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
269 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
271 // fields
272 // Field info extracted from the class file and stored
273 // as an array of 7 shorts
274 enum FieldOffset {
275 access_flags_offset = 0,
276 name_index_offset = 1,
277 signature_index_offset = 2,
278 initval_index_offset = 3,
279 low_offset = 4,
280 high_offset = 5,
281 generic_signature_offset = 6,
282 next_offset = 7
283 };
285 typeArrayOop fields() const { return _fields; }
286 int offset_from_fields( int index ) const {
287 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
288 fields()->ushort_at(index + high_offset) );
289 }
291 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
293 // inner classes
294 typeArrayOop inner_classes() const { return _inner_classes; }
295 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
297 enum InnerClassAttributeOffset {
298 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
299 inner_class_inner_class_info_offset = 0,
300 inner_class_outer_class_info_offset = 1,
301 inner_class_inner_name_offset = 2,
302 inner_class_access_flags_offset = 3,
303 inner_class_next_offset = 4
304 };
306 // package
307 bool is_same_class_package(klassOop class2);
308 bool is_same_class_package(oop classloader2, symbolOop classname2);
309 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
311 // find an enclosing class (defined where original code was, in jvm.cpp!)
312 klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) {
313 instanceKlassHandle self(THREAD, this->as_klassOop());
314 return compute_enclosing_class_impl(self, simple_name_result, THREAD);
315 }
316 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
317 symbolOop& simple_name_result, TRAPS);
319 // tell if two classes have the same enclosing class (at package level)
320 bool is_same_package_member(klassOop class2, TRAPS) {
321 instanceKlassHandle self(THREAD, this->as_klassOop());
322 return is_same_package_member_impl(self, class2, THREAD);
323 }
324 static bool is_same_package_member_impl(instanceKlassHandle self,
325 klassOop class2, TRAPS);
327 // initialization state
328 bool is_loaded() const { return _init_state >= loaded; }
329 bool is_linked() const { return _init_state >= linked; }
330 bool is_initialized() const { return _init_state == fully_initialized; }
331 bool is_not_initialized() const { return _init_state < being_initialized; }
332 bool is_being_initialized() const { return _init_state == being_initialized; }
333 bool is_in_error_state() const { return _init_state == initialization_error; }
334 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
335 int get_init_state() { return _init_state; } // Useful for debugging
336 bool is_rewritten() const { return _rewritten; }
338 // marking
339 bool is_marked_dependent() const { return _is_marked_dependent; }
340 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
342 // initialization (virtuals from Klass)
343 bool should_be_initialized() const; // means that initialize should be called
344 void initialize(TRAPS);
345 void link_class(TRAPS);
346 bool link_class_or_fail(TRAPS); // returns false on failure
347 void unlink_class();
348 void rewrite_class(TRAPS);
349 methodOop class_initializer();
351 // set the class to initialized if no static initializer is present
352 void eager_initialize(Thread *thread);
354 // reference type
355 ReferenceType reference_type() const { return _reference_type; }
356 void set_reference_type(ReferenceType t) { _reference_type = t; }
358 // find local field, returns true if found
359 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
360 // find field in direct superinterfaces, returns the interface in which the field is defined
361 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
362 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
363 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
364 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
365 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
367 // find a non-static or static field given its offset within the class.
368 bool contains_field_offset(int offset) {
369 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
370 }
372 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
373 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
375 // find a local method (returns NULL if not found)
376 methodOop find_method(symbolOop name, symbolOop signature) const;
377 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
379 // lookup operation (returns NULL if not found)
380 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
382 // lookup a method in all the interfaces that this class implements
383 // (returns NULL if not found)
384 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
386 // constant pool
387 constantPoolOop constants() const { return _constants; }
388 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
390 // class loader
391 oop class_loader() const { return _class_loader; }
392 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
394 // protection domain
395 oop protection_domain() { return _protection_domain; }
396 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
398 // host class
399 oop host_klass() const { return _host_klass; }
400 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
401 bool is_anonymous() const { return _host_klass != NULL; }
403 // signers
404 objArrayOop signers() const { return _signers; }
405 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
407 // source file name
408 symbolOop source_file_name() const { return _source_file_name; }
409 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
411 // minor and major version numbers of class file
412 u2 minor_version() const { return _minor_version; }
413 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
414 u2 major_version() const { return _major_version; }
415 void set_major_version(u2 major_version) { _major_version = major_version; }
417 // source debug extension
418 symbolOop source_debug_extension() const { return _source_debug_extension; }
419 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
421 // nonstatic oop-map blocks
422 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
423 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
425 // RedefineClasses() support for previous versions:
426 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
427 int emcp_method_count);
428 bool has_previous_version() const;
429 void init_previous_versions() {
430 _previous_versions = NULL;
431 }
432 GrowableArray<PreviousVersionNode *>* previous_versions() const {
433 return _previous_versions;
434 }
436 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
437 void set_cached_class_file(unsigned char *class_file_bytes,
438 jint class_file_len) { _cached_class_file_len = class_file_len;
439 _cached_class_file_bytes = class_file_bytes; }
440 jint get_cached_class_file_len() { return _cached_class_file_len; }
441 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
443 // JVMTI: Support for caching of field indices, types, and offsets
444 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
445 _jvmti_cached_class_field_map = descriptor;
446 }
447 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
448 return _jvmti_cached_class_field_map;
449 }
451 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
452 inline u2 next_method_idnum();
453 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
455 // generics support
456 symbolOop generic_signature() const { return _generic_signature; }
457 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
458 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
459 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
460 void set_enclosing_method_indices(u2 class_index,
461 u2 method_index) { _enclosing_method_class_index = class_index;
462 _enclosing_method_method_index = method_index; }
464 // jmethodID support
465 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum,
466 jmethodID new_id, jmethodID* new_jmeths);
467 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
468 jmethodID jmethod_id_or_null(methodOop method);
470 // cached itable index support
471 void set_cached_itable_index(size_t idnum, int index);
472 int cached_itable_index(size_t idnum);
474 // annotations support
475 typeArrayOop class_annotations() const { return _class_annotations; }
476 objArrayOop fields_annotations() const { return _fields_annotations; }
477 objArrayOop methods_annotations() const { return _methods_annotations; }
478 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
479 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
480 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
481 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
482 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
483 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
484 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
485 typeArrayOop get_method_annotations_of(int idnum)
486 { return get_method_annotations_from(idnum, _methods_annotations); }
487 typeArrayOop get_method_parameter_annotations_of(int idnum)
488 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
489 typeArrayOop get_method_default_annotations_of(int idnum)
490 { return get_method_annotations_from(idnum, _methods_default_annotations); }
491 void set_method_annotations_of(int idnum, typeArrayOop anno)
492 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
493 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
494 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
495 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
496 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
498 // allocation
499 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
500 instanceOop allocate_instance(TRAPS);
501 instanceOop allocate_permanent_instance(TRAPS);
503 // additional member function to return a handle
504 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
506 objArrayOop allocate_objArray(int n, int length, TRAPS);
507 // Helper function
508 static instanceOop register_finalizer(instanceOop i, TRAPS);
510 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
511 // if not, throw either an Error or an Exception.
512 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
514 // initialization
515 void call_class_initializer(TRAPS);
516 void set_initialization_state_and_notify(ClassState state, TRAPS);
518 // OopMapCache support
519 OopMapCache* oop_map_cache() { return _oop_map_cache; }
520 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
521 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
523 // JNI identifier support (for static fields - for jni performance)
524 JNIid* jni_ids() { return _jni_ids; }
525 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
526 JNIid* jni_id_for(int offset);
528 // maintenance of deoptimization dependencies
529 int mark_dependent_nmethods(DepChange& changes);
530 void add_dependent_nmethod(nmethod* nm);
531 void remove_dependent_nmethod(nmethod* nm);
533 // On-stack replacement support
534 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
535 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
536 void add_osr_nmethod(nmethod* n);
537 void remove_osr_nmethod(nmethod* n);
538 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
540 // Breakpoint support (see methods on methodOop for details)
541 BreakpointInfo* breakpoints() const { return _breakpoints; };
542 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
544 // support for stub routines
545 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
546 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
548 // subclass/subinterface checks
549 bool implements_interface(klassOop k) const;
551 // Access to implementors of an interface. We only store the count
552 // of implementors, and in case, there are only a few
553 // implementors, we store them in a short list.
554 // This accessor returns NULL if we walk off the end of the list.
555 klassOop implementor(int i) const {
556 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
557 }
558 int nof_implementors() const { return _nof_implementors; }
559 void add_implementor(klassOop k); // k is a new class that implements this interface
560 void init_implementor(); // initialize
562 // link this class into the implementors list of every interface it implements
563 void process_interfaces(Thread *thread);
565 // virtual operations from Klass
566 bool is_leaf_class() const { return _subklass == NULL; }
567 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
568 bool compute_is_subtype_of(klassOop k);
569 bool can_be_primary_super_slow() const;
570 klassOop java_super() const { return super(); }
571 int oop_size(oop obj) const { return size_helper(); }
572 int klass_oop_size() const { return object_size(); }
573 bool oop_is_instance_slow() const { return true; }
575 // Iterators
576 void do_local_static_fields(FieldClosure* cl);
577 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
578 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
580 void methods_do(void f(methodOop method));
581 void array_klasses_do(void f(klassOop k));
582 void with_array_klasses_do(void f(klassOop k));
583 bool super_types_do(SuperTypeClosure* blk);
585 // Casting from klassOop
586 static instanceKlass* cast(klassOop k) {
587 Klass* kp = k->klass_part();
588 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
589 return (instanceKlass*) kp;
590 }
592 // Sizing (in words)
593 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
594 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
595 static int vtable_start_offset() { return header_size(); }
596 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
597 static int object_size(int extra) { return align_object_size(header_size() + extra); }
599 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
600 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
601 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
603 // Static field offset is an offset into the Heap, should be converted by
604 // based on UseCompressedOop for traversal
605 HeapWord* start_of_static_fields() const {
606 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
607 }
609 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
611 int offset_of_static_fields() const {
612 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
613 }
615 OopMapBlock* start_of_nonstatic_oop_maps() const {
616 return (OopMapBlock*) (start_of_static_fields() + static_field_size());
617 }
619 // Allocation profiling support
620 juint alloc_size() const { return _alloc_count * size_helper(); }
621 void set_alloc_size(juint n) {}
623 // Use this to return the size of an instance in heap words:
624 int size_helper() const {
625 return layout_helper_to_size_helper(layout_helper());
626 }
628 // This bit is initialized in classFileParser.cpp.
629 // It is false under any of the following conditions:
630 // - the class is abstract (including any interface)
631 // - the class has a finalizer (if !RegisterFinalizersAtInit)
632 // - the class size is larger than FastAllocateSizeLimit
633 // - the class is java/lang/Class, which cannot be allocated directly
634 bool can_be_fastpath_allocated() const {
635 return !layout_helper_needs_slow_path(layout_helper());
636 }
638 // Java vtable/itable
639 klassVtable* vtable() const; // return new klassVtable wrapper
640 inline methodOop method_at_vtable(int index);
641 klassItable* itable() const; // return new klassItable wrapper
642 methodOop method_at_itable(klassOop holder, int index, TRAPS);
644 // Garbage collection
645 void oop_follow_contents(oop obj);
646 void follow_static_fields();
647 void adjust_static_fields();
648 int oop_adjust_pointers(oop obj);
649 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
650 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
652 void follow_weak_klass_links(
653 BoolObjectClosure* is_alive, OopClosure* keep_alive);
654 void release_C_heap_structures();
656 // Parallel Scavenge and Parallel Old
657 PARALLEL_GC_DECLS
659 #ifndef SERIALGC
660 // Parallel Scavenge
661 void copy_static_fields(PSPromotionManager* pm);
662 void push_static_fields(PSPromotionManager* pm);
664 // Parallel Old
665 void follow_static_fields(ParCompactionManager* cm);
666 void copy_static_fields(ParCompactionManager* cm);
667 void update_static_fields();
668 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
669 #endif // SERIALGC
671 // Naming
672 char* signature_name() const;
674 // Iterators
675 int oop_oop_iterate(oop obj, OopClosure* blk) {
676 return oop_oop_iterate_v(obj, blk);
677 }
679 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
680 return oop_oop_iterate_v_m(obj, blk, mr);
681 }
683 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
684 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
685 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
686 MemRegion mr);
688 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
689 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
691 #ifndef SERIALGC
692 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
693 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
695 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
696 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
697 #endif // !SERIALGC
699 void iterate_static_fields(OopClosure* closure);
700 void iterate_static_fields(OopClosure* closure, MemRegion mr);
702 private:
703 // initialization state
704 #ifdef ASSERT
705 void set_init_state(ClassState state);
706 #else
707 void set_init_state(ClassState state) { _init_state = state; }
708 #endif
709 void set_rewritten() { _rewritten = true; }
710 void set_init_thread(Thread *thread) { _init_thread = thread; }
712 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
713 jmethodID* methods_jmethod_ids_acquire() const
714 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
715 void release_set_methods_jmethod_ids(jmethodID* jmeths)
716 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
718 int* methods_cached_itable_indices_acquire() const
719 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
720 void release_set_methods_cached_itable_indices(int* indices)
721 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
723 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
724 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
725 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
727 // Offsets for memory management
728 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
729 oop* adr_methods() const { return (oop*)&this->_methods;}
730 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
731 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
732 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
733 oop* adr_fields() const { return (oop*)&this->_fields;}
734 oop* adr_constants() const { return (oop*)&this->_constants;}
735 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
736 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
737 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
738 oop* adr_signers() const { return (oop*)&this->_signers;}
739 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
740 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
741 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
742 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
743 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
744 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
745 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
746 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
747 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
748 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
749 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
750 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
752 // Static methods that are used to implement member methods where an exposed this pointer
753 // is needed due to possible GCs
754 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
755 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
756 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
757 static void eager_initialize_impl (instanceKlassHandle this_oop);
758 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
759 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
760 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
761 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
762 /* jni_id_for_impl for jfieldID only */
763 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
765 // Returns the array class for the n'th dimension
766 klassOop array_klass_impl(bool or_null, int n, TRAPS);
768 // Returns the array class with this class as element type
769 klassOop array_klass_impl(bool or_null, TRAPS);
771 public:
772 // sharing support
773 virtual void remove_unshareable_info();
774 void field_names_and_sigs_iterate(OopClosure* closure);
776 // jvm support
777 jint compute_modifier_flags(TRAPS) const;
779 public:
780 // JVMTI support
781 jint jvmti_class_status() const;
783 #ifndef PRODUCT
784 public:
785 // Printing
786 void oop_print_on (oop obj, outputStream* st);
787 void oop_print_value_on(oop obj, outputStream* st);
789 void print_dependent_nmethods(bool verbose = false);
790 bool is_dependent_nmethod(nmethod* nm);
791 #endif
793 public:
794 // Verification
795 const char* internal_name() const;
796 void oop_verify_on(oop obj, outputStream* st);
798 #ifndef PRODUCT
799 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
800 #endif
801 };
803 inline methodOop instanceKlass::method_at_vtable(int index) {
804 #ifndef PRODUCT
805 assert(index >= 0, "valid vtable index");
806 if (DebugVtables) {
807 verify_vtable_index(index);
808 }
809 #endif
810 vtableEntry* ve = (vtableEntry*)start_of_vtable();
811 return ve[index].method();
812 }
814 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
815 if (annos == NULL || annos->length() <= idnum) {
816 return NULL;
817 }
818 return typeArrayOop(annos->obj_at(idnum));
819 }
821 // for adding methods
822 // UNSET_IDNUM return means no more ids available
823 inline u2 instanceKlass::next_method_idnum() {
824 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
825 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
826 } else {
827 return _idnum_allocated_count++;
828 }
829 }
832 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
834 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
835 private:
836 jushort _offset; // Offset of first oop in oop-map block
837 jushort _length; // Length of oop-map block
838 public:
839 // Accessors
840 jushort offset() const { return _offset; }
841 void set_offset(jushort offset) { _offset = offset; }
843 jushort length() const { return _length; }
844 void set_length(jushort length) { _length = length; }
845 };
847 /* JNIid class for jfieldIDs only */
848 class JNIid: public CHeapObj {
849 friend class VMStructs;
850 private:
851 klassOop _holder;
852 JNIid* _next;
853 int _offset;
854 #ifdef ASSERT
855 bool _is_static_field_id;
856 #endif
858 public:
859 // Accessors
860 klassOop holder() const { return _holder; }
861 int offset() const { return _offset; }
862 JNIid* next() { return _next; }
863 // Constructor
864 JNIid(klassOop holder, int offset, JNIid* next);
865 // Identifier lookup
866 JNIid* find(int offset);
868 // Garbage collection support
869 oop* holder_addr() { return (oop*)&_holder; }
870 void oops_do(OopClosure* f);
871 static void deallocate(JNIid* id);
872 // Debugging
873 #ifdef ASSERT
874 bool is_static_field_id() const { return _is_static_field_id; }
875 void set_is_static_field_id() { _is_static_field_id = true; }
876 #endif
877 void verify(klassOop holder);
878 };
881 // If breakpoints are more numerous than just JVMTI breakpoints,
882 // consider compressing this data structure.
883 // It is currently a simple linked list defined in methodOop.hpp.
885 class BreakpointInfo;
888 // A collection point for interesting information about the previous
889 // version(s) of an instanceKlass. This class uses weak references to
890 // the information so that the information may be collected as needed
891 // by the system. If the information is shared, then a regular
892 // reference must be used because a weak reference would be seen as
893 // collectible. A GrowableArray of PreviousVersionNodes is attached
894 // to the instanceKlass as needed. See PreviousVersionWalker below.
895 class PreviousVersionNode : public CHeapObj {
896 private:
897 // A shared ConstantPool is never collected so we'll always have
898 // a reference to it so we can update items in the cache. We'll
899 // have a weak reference to a non-shared ConstantPool until all
900 // of the methods (EMCP or obsolete) have been collected; the
901 // non-shared ConstantPool becomes collectible at that point.
902 jobject _prev_constant_pool; // regular or weak reference
903 bool _prev_cp_is_weak; // true if not a shared ConstantPool
905 // If the previous version of the instanceKlass doesn't have any
906 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
907 // EMCP methods have been collected, then _prev_EMCP_methods can
908 // have a length of zero.
909 GrowableArray<jweak>* _prev_EMCP_methods;
911 public:
912 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
913 GrowableArray<jweak>* prev_EMCP_methods);
914 ~PreviousVersionNode();
915 jobject prev_constant_pool() const {
916 return _prev_constant_pool;
917 }
918 GrowableArray<jweak>* prev_EMCP_methods() const {
919 return _prev_EMCP_methods;
920 }
921 };
924 // A Handle-ized version of PreviousVersionNode.
925 class PreviousVersionInfo : public ResourceObj {
926 private:
927 constantPoolHandle _prev_constant_pool_handle;
928 // If the previous version of the instanceKlass doesn't have any
929 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
930 // methods cannot be collected while we hold a handle,
931 // _prev_EMCP_methods should never have a length of zero.
932 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
934 public:
935 PreviousVersionInfo(PreviousVersionNode *pv_node);
936 ~PreviousVersionInfo();
937 constantPoolHandle prev_constant_pool_handle() const {
938 return _prev_constant_pool_handle;
939 }
940 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
941 return _prev_EMCP_method_handles;
942 }
943 };
946 // Helper object for walking previous versions. This helper cleans up
947 // the Handles that it allocates when the helper object is destroyed.
948 // The PreviousVersionInfo object returned by next_previous_version()
949 // is only valid until a subsequent call to next_previous_version() or
950 // the helper object is destroyed.
951 class PreviousVersionWalker : public StackObj {
952 private:
953 GrowableArray<PreviousVersionNode *>* _previous_versions;
954 int _current_index;
955 // Fields for cleaning up when we are done walking the previous versions:
956 // A HandleMark for the PreviousVersionInfo handles:
957 HandleMark _hm;
959 // It would be nice to have a ResourceMark field in this helper also,
960 // but the ResourceMark code says to be careful to delete handles held
961 // in GrowableArrays _before_ deleting the GrowableArray. Since we
962 // can't guarantee the order in which the fields are destroyed, we
963 // have to let the creator of the PreviousVersionWalker object do
964 // the right thing. Also, adding a ResourceMark here causes an
965 // include loop.
967 // A pointer to the current info object so we can handle the deletes.
968 PreviousVersionInfo * _current_p;
970 public:
971 PreviousVersionWalker(instanceKlass *ik);
972 ~PreviousVersionWalker();
974 // Return the interesting information for the next previous version
975 // of the klass. Returns NULL if there are no more previous versions.
976 PreviousVersionInfo* next_previous_version();
977 };