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