Fri, 18 Mar 2011 16:00:34 -0700
7017732: move static fields into Class to prepare for perm gen removal
Reviewed-by: kvn, coleenp, twisti, stefank
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "oops/constMethodOop.hpp"
29 #include "oops/constantPoolOop.hpp"
30 #include "oops/instanceOop.hpp"
31 #include "oops/klassOop.hpp"
32 #include "oops/klassVtable.hpp"
33 #include "oops/objArrayOop.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/os.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/bitMap.inline.hpp"
39 // An instanceKlass is the VM level representation of a Java class.
40 // It contains all information needed for at class at execution runtime.
42 // instanceKlass layout:
43 // [header ] klassOop
44 // [klass pointer ] klassOop
45 // [C++ vtbl pointer ] Klass
46 // [subtype cache ] Klass
47 // [instance size ] Klass
48 // [java mirror ] Klass
49 // [super ] Klass
50 // [access_flags ] Klass
51 // [name ] Klass
52 // [first subklass ] Klass
53 // [next sibling ] Klass
54 // [array klasses ]
55 // [methods ]
56 // [local interfaces ]
57 // [transitive interfaces ]
58 // [number of implementors ]
59 // [implementors ] klassOop[2]
60 // [fields ]
61 // [constants ]
62 // [class loader ]
63 // [protection domain ]
64 // [signers ]
65 // [source file name ]
66 // [inner classes ]
67 // [static field size ]
68 // [nonstatic field size ]
69 // [static oop fields size ]
70 // [nonstatic oop maps size ]
71 // [has finalize method ]
72 // [deoptimization mark bit ]
73 // [initialization state ]
74 // [initializing thread ]
75 // [Java vtable length ]
76 // [oop map cache (stack maps) ]
77 // [EMBEDDED Java vtable ] size in words = vtable_len
78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
79 //
80 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
81 // where oops are located in instances of this klass.
84 // forward declaration for class -- see below for definition
85 class SuperTypeClosure;
86 class JNIid;
87 class jniIdMapBase;
88 class BreakpointInfo;
89 class fieldDescriptor;
90 class DepChange;
91 class nmethodBucket;
92 class PreviousVersionNode;
93 class JvmtiCachedClassFieldMap;
95 // This is used in iterators below.
96 class FieldClosure: public StackObj {
97 public:
98 virtual void do_field(fieldDescriptor* fd) = 0;
99 };
101 #ifndef PRODUCT
102 // Print fields.
103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 class FieldPrinter: public FieldClosure {
105 oop _obj;
106 outputStream* _st;
107 public:
108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 void do_field(fieldDescriptor* fd);
110 };
111 #endif // !PRODUCT
113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 // this klass.
115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 public:
117 // Byte offset of the first oop mapped by this block.
118 int offset() const { return _offset; }
119 void set_offset(int offset) { _offset = offset; }
121 // Number of oops in this block.
122 uint count() const { return _count; }
123 void set_count(uint count) { _count = count; }
125 // sizeof(OopMapBlock) in HeapWords.
126 static const int size_in_words() {
127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 LogHeapWordSize;
129 }
131 private:
132 int _offset;
133 uint _count;
134 };
136 class instanceKlass: public Klass {
137 friend class VMStructs;
138 public:
139 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
140 // of the class loading & initialization procedure, and the use of the states.
141 enum ClassState {
142 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
143 allocated, // allocated (but not yet linked)
144 loaded, // loaded and inserted in class hierarchy (but not linked yet)
145 linked, // successfully linked/verified (but not initialized yet)
146 being_initialized, // currently running class initializer
147 fully_initialized, // initialized (successfull final state)
148 initialization_error // error happened during initialization
149 };
151 public:
152 oop* oop_block_beg() const { return adr_array_klasses(); }
153 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
155 enum {
156 implementors_limit = 2 // how many implems can we track?
157 };
159 protected:
160 //
161 // The oop block. See comment in klass.hpp before making changes.
162 //
164 // Array classes holding elements of this class.
165 klassOop _array_klasses;
166 // Method array.
167 objArrayOop _methods;
168 // Int array containing the original order of method in the class file (for
169 // JVMTI).
170 typeArrayOop _method_ordering;
171 // Interface (klassOops) this class declares locally to implement.
172 objArrayOop _local_interfaces;
173 // Interface (klassOops) this class implements transitively.
174 objArrayOop _transitive_interfaces;
175 // Instance and static variable information, 5-tuples of shorts [access, name
176 // index, sig index, initval index, offset].
177 typeArrayOop _fields;
178 // Constant pool for this class.
179 constantPoolOop _constants;
180 // Class loader used to load this class, NULL if VM loader used.
181 oop _class_loader;
182 // Protection domain.
183 oop _protection_domain;
184 // Host class, which grants its access privileges to this class also.
185 // This is only non-null for an anonymous class (AnonymousClasses enabled).
186 // The host class is either named, or a previously loaded anonymous class.
187 klassOop _host_klass;
188 // Class signers.
189 objArrayOop _signers;
190 // inner_classes attribute.
191 typeArrayOop _inner_classes;
192 // Implementors of this interface (not valid if it overflows)
193 klassOop _implementors[implementors_limit];
194 // invokedynamic bootstrap method (a java.lang.invoke.MethodHandle)
195 oop _bootstrap_method; // AllowTransitionalJSR292 ONLY
196 // Annotations for this class, or null if none.
197 typeArrayOop _class_annotations;
198 // Annotation objects (byte arrays) for fields, or null if no annotations.
199 // Indices correspond to entries (not indices) in fields array.
200 objArrayOop _fields_annotations;
201 // Annotation objects (byte arrays) for methods, or null if no annotations.
202 // Index is the idnum, which is initially the same as the methods array index.
203 objArrayOop _methods_annotations;
204 // Annotation objects (byte arrays) for methods' parameters, or null if no
205 // such annotations.
206 // Index is the idnum, which is initially the same as the methods array index.
207 objArrayOop _methods_parameter_annotations;
208 // Annotation objects (byte arrays) for methods' default values, or null if no
209 // such annotations.
210 // Index is the idnum, which is initially the same as the methods array index.
211 objArrayOop _methods_default_annotations;
213 //
214 // End of the oop block.
215 //
217 // Name of source file containing this klass, NULL if not specified.
218 Symbol* _source_file_name;
219 // the source debug extension for this klass, NULL if not specified.
220 Symbol* _source_debug_extension;
221 // Generic signature, or null if none.
222 Symbol* _generic_signature;
223 // Array name derived from this class which needs unreferencing
224 // if this class is unloaded.
225 Symbol* _array_name;
227 // Number of heapOopSize words used by non-static fields in this klass
228 // (including inherited fields but after header_size()).
229 int _nonstatic_field_size;
230 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
231 int _static_oop_field_count;// number of static oop fields in this klass
232 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
233 bool _is_marked_dependent; // used for marking during flushing and deoptimization
234 bool _rewritten; // methods rewritten.
235 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
236 bool _should_verify_class; // allow caching of preverification
237 u2 _minor_version; // minor version number of class file
238 u2 _major_version; // major version number of class file
239 ClassState _init_state; // state of class
240 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
241 int _vtable_len; // length of Java vtable (in words)
242 int _itable_len; // length of Java itable (in words)
243 ReferenceType _reference_type; // reference type
244 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
245 JNIid* _jni_ids; // First JNI identifier for static fields in this class
246 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
247 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
248 nmethodBucket* _dependencies; // list of dependent nmethods
249 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
250 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
251 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
252 // Array of interesting part(s) of the previous version(s) of this
253 // instanceKlass. See PreviousVersionWalker below.
254 GrowableArray<PreviousVersionNode *>* _previous_versions;
255 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
256 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
257 // JVMTI fields can be moved to their own structure - see 6315920
258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
259 jint _cached_class_file_len; // JVMTI: length of above
260 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
263 // embedded Java vtable follows here
264 // embedded Java itables follows here
265 // embedded static fields follows here
266 // embedded nonstatic oop-map blocks follows here
268 friend class instanceKlassKlass;
269 friend class SystemDictionary;
271 public:
272 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
273 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
275 // field sizes
276 int nonstatic_field_size() const { return _nonstatic_field_size; }
277 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
279 int static_field_size() const { return _static_field_size; }
280 void set_static_field_size(int size) { _static_field_size = size; }
282 int static_oop_field_count() const { return _static_oop_field_count; }
283 void set_static_oop_field_count(int size) { _static_oop_field_count = size; }
285 // Java vtable
286 int vtable_length() const { return _vtable_len; }
287 void set_vtable_length(int len) { _vtable_len = len; }
289 // Java itable
290 int itable_length() const { return _itable_len; }
291 void set_itable_length(int len) { _itable_len = len; }
293 // array klasses
294 klassOop array_klasses() const { return _array_klasses; }
295 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
297 // methods
298 objArrayOop methods() const { return _methods; }
299 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
300 methodOop method_with_idnum(int idnum);
302 // method ordering
303 typeArrayOop method_ordering() const { return _method_ordering; }
304 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
306 // interfaces
307 objArrayOop local_interfaces() const { return _local_interfaces; }
308 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
309 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
310 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
312 // fields
313 // Field info extracted from the class file and stored
314 // as an array of 7 shorts
315 enum FieldOffset {
316 access_flags_offset = 0,
317 name_index_offset = 1,
318 signature_index_offset = 2,
319 initval_index_offset = 3,
320 low_offset = 4,
321 high_offset = 5,
322 generic_signature_offset = 6,
323 next_offset = 7
324 };
326 typeArrayOop fields() const { return _fields; }
327 int offset_from_fields( int index ) const {
328 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
329 fields()->ushort_at(index + high_offset) );
330 }
332 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
334 // inner classes
335 typeArrayOop inner_classes() const { return _inner_classes; }
336 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
338 enum InnerClassAttributeOffset {
339 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
340 inner_class_inner_class_info_offset = 0,
341 inner_class_outer_class_info_offset = 1,
342 inner_class_inner_name_offset = 2,
343 inner_class_access_flags_offset = 3,
344 inner_class_next_offset = 4
345 };
347 // method override check
348 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
350 // package
351 bool is_same_class_package(klassOop class2);
352 bool is_same_class_package(oop classloader2, Symbol* classname2);
353 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
355 // find an enclosing class (defined where original code was, in jvm.cpp!)
356 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) {
357 instanceKlassHandle self(THREAD, this->as_klassOop());
358 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
359 }
360 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
361 bool* inner_is_member, TRAPS);
363 // tell if two classes have the same enclosing class (at package level)
364 bool is_same_package_member(klassOop class2, TRAPS) {
365 instanceKlassHandle self(THREAD, this->as_klassOop());
366 return is_same_package_member_impl(self, class2, THREAD);
367 }
368 static bool is_same_package_member_impl(instanceKlassHandle self,
369 klassOop class2, TRAPS);
371 // initialization state
372 bool is_loaded() const { return _init_state >= loaded; }
373 bool is_linked() const { return _init_state >= linked; }
374 bool is_initialized() const { return _init_state == fully_initialized; }
375 bool is_not_initialized() const { return _init_state < being_initialized; }
376 bool is_being_initialized() const { return _init_state == being_initialized; }
377 bool is_in_error_state() const { return _init_state == initialization_error; }
378 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
379 int get_init_state() { return _init_state; } // Useful for debugging
380 bool is_rewritten() const { return _rewritten; }
382 // defineClass specified verification
383 bool should_verify_class() const { return _should_verify_class; }
384 void set_should_verify_class(bool value) { _should_verify_class = value; }
386 // marking
387 bool is_marked_dependent() const { return _is_marked_dependent; }
388 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
390 // initialization (virtuals from Klass)
391 bool should_be_initialized() const; // means that initialize should be called
392 void initialize(TRAPS);
393 void link_class(TRAPS);
394 bool link_class_or_fail(TRAPS); // returns false on failure
395 void unlink_class();
396 void rewrite_class(TRAPS);
397 methodOop class_initializer();
399 // set the class to initialized if no static initializer is present
400 void eager_initialize(Thread *thread);
402 // reference type
403 ReferenceType reference_type() const { return _reference_type; }
404 void set_reference_type(ReferenceType t) { _reference_type = t; }
406 // find local field, returns true if found
407 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
408 // find field in direct superinterfaces, returns the interface in which the field is defined
409 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
410 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
411 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
412 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
413 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
415 // find a non-static or static field given its offset within the class.
416 bool contains_field_offset(int offset) {
417 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
418 }
420 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
421 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
423 // find a local method (returns NULL if not found)
424 methodOop find_method(Symbol* name, Symbol* signature) const;
425 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature);
427 // lookup operation (returns NULL if not found)
428 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const;
430 // lookup a method in all the interfaces that this class implements
431 // (returns NULL if not found)
432 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
434 // constant pool
435 constantPoolOop constants() const { return _constants; }
436 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
438 // class loader
439 oop class_loader() const { return _class_loader; }
440 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
442 // protection domain
443 oop protection_domain() { return _protection_domain; }
444 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
446 // host class
447 oop host_klass() const { return _host_klass; }
448 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
449 bool is_anonymous() const { return _host_klass != NULL; }
451 // signers
452 objArrayOop signers() const { return _signers; }
453 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
455 // source file name
456 Symbol* source_file_name() const { return _source_file_name; }
457 void set_source_file_name(Symbol* n);
459 // minor and major version numbers of class file
460 u2 minor_version() const { return _minor_version; }
461 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
462 u2 major_version() const { return _major_version; }
463 void set_major_version(u2 major_version) { _major_version = major_version; }
465 // source debug extension
466 Symbol* source_debug_extension() const { return _source_debug_extension; }
467 void set_source_debug_extension(Symbol* n);
469 // symbol unloading support (refcount already added)
470 Symbol* array_name() { return _array_name; }
471 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
473 // nonstatic oop-map blocks
474 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
475 return oop_map_count * OopMapBlock::size_in_words();
476 }
477 unsigned int nonstatic_oop_map_count() const {
478 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
479 }
480 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
481 void set_nonstatic_oop_map_size(int words) {
482 _nonstatic_oop_map_size = words;
483 }
485 // RedefineClasses() support for previous versions:
486 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
487 int emcp_method_count);
488 // If the _previous_versions array is non-NULL, then this klass
489 // has been redefined at least once even if we aren't currently
490 // tracking a previous version.
491 bool has_been_redefined() const { return _previous_versions != NULL; }
492 bool has_previous_version() const;
493 void init_previous_versions() {
494 _previous_versions = NULL;
495 }
496 GrowableArray<PreviousVersionNode *>* previous_versions() const {
497 return _previous_versions;
498 }
500 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
501 void set_cached_class_file(unsigned char *class_file_bytes,
502 jint class_file_len) { _cached_class_file_len = class_file_len;
503 _cached_class_file_bytes = class_file_bytes; }
504 jint get_cached_class_file_len() { return _cached_class_file_len; }
505 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
507 // JVMTI: Support for caching of field indices, types, and offsets
508 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
509 _jvmti_cached_class_field_map = descriptor;
510 }
511 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
512 return _jvmti_cached_class_field_map;
513 }
515 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
516 inline u2 next_method_idnum();
517 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
519 // generics support
520 Symbol* generic_signature() const { return _generic_signature; }
521 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
523 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
524 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
525 void set_enclosing_method_indices(u2 class_index,
526 u2 method_index) { _enclosing_method_class_index = class_index;
527 _enclosing_method_method_index = method_index; }
529 // JSR 292 support
530 oop bootstrap_method() const { return _bootstrap_method; } // AllowTransitionalJSR292 ONLY
531 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); }
533 // jmethodID support
534 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
535 methodHandle method_h);
536 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
537 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
538 jmethodID* to_dealloc_id_p,
539 jmethodID** to_dealloc_jmeths_p);
540 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
541 size_t *length_p, jmethodID* id_p);
542 jmethodID jmethod_id_or_null(methodOop method);
544 // cached itable index support
545 void set_cached_itable_index(size_t idnum, int index);
546 int cached_itable_index(size_t idnum);
548 // annotations support
549 typeArrayOop class_annotations() const { return _class_annotations; }
550 objArrayOop fields_annotations() const { return _fields_annotations; }
551 objArrayOop methods_annotations() const { return _methods_annotations; }
552 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
553 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
554 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
555 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
556 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
557 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
558 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
559 typeArrayOop get_method_annotations_of(int idnum)
560 { return get_method_annotations_from(idnum, _methods_annotations); }
561 typeArrayOop get_method_parameter_annotations_of(int idnum)
562 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
563 typeArrayOop get_method_default_annotations_of(int idnum)
564 { return get_method_annotations_from(idnum, _methods_default_annotations); }
565 void set_method_annotations_of(int idnum, typeArrayOop anno)
566 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
567 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
568 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
569 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
570 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
572 // allocation
573 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
574 instanceOop allocate_instance(TRAPS);
575 instanceOop allocate_permanent_instance(TRAPS);
577 // additional member function to return a handle
578 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
580 objArrayOop allocate_objArray(int n, int length, TRAPS);
581 // Helper function
582 static instanceOop register_finalizer(instanceOop i, TRAPS);
584 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
585 // if not, throw either an Error or an Exception.
586 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
588 // initialization
589 void call_class_initializer(TRAPS);
590 void set_initialization_state_and_notify(ClassState state, TRAPS);
592 // OopMapCache support
593 OopMapCache* oop_map_cache() { return _oop_map_cache; }
594 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
595 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
597 // JNI identifier support (for static fields - for jni performance)
598 JNIid* jni_ids() { return _jni_ids; }
599 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
600 JNIid* jni_id_for(int offset);
602 // maintenance of deoptimization dependencies
603 int mark_dependent_nmethods(DepChange& changes);
604 void add_dependent_nmethod(nmethod* nm);
605 void remove_dependent_nmethod(nmethod* nm);
607 // On-stack replacement support
608 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
609 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
610 void add_osr_nmethod(nmethod* n);
611 void remove_osr_nmethod(nmethod* n);
612 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const;
614 // Breakpoint support (see methods on methodOop for details)
615 BreakpointInfo* breakpoints() const { return _breakpoints; };
616 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
618 // support for stub routines
619 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
620 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
622 // subclass/subinterface checks
623 bool implements_interface(klassOop k) const;
625 // Access to implementors of an interface. We only store the count
626 // of implementors, and in case, there are only a few
627 // implementors, we store them in a short list.
628 // This accessor returns NULL if we walk off the end of the list.
629 klassOop implementor(int i) const {
630 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
631 }
632 int nof_implementors() const { return _nof_implementors; }
633 void add_implementor(klassOop k); // k is a new class that implements this interface
634 void init_implementor(); // initialize
636 // link this class into the implementors list of every interface it implements
637 void process_interfaces(Thread *thread);
639 // virtual operations from Klass
640 bool is_leaf_class() const { return _subklass == NULL; }
641 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
642 bool compute_is_subtype_of(klassOop k);
643 bool can_be_primary_super_slow() const;
644 klassOop java_super() const { return super(); }
645 int oop_size(oop obj) const { return size_helper(); }
646 int klass_oop_size() const { return object_size(); }
647 bool oop_is_instance_slow() const { return true; }
649 // Iterators
650 void do_local_static_fields(FieldClosure* cl);
651 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
652 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
654 void methods_do(void f(methodOop method));
655 void array_klasses_do(void f(klassOop k));
656 void with_array_klasses_do(void f(klassOop k));
657 bool super_types_do(SuperTypeClosure* blk);
659 // Casting from klassOop
660 static instanceKlass* cast(klassOop k) {
661 assert(k->is_klass(), "must be");
662 Klass* kp = k->klass_part();
663 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
664 return (instanceKlass*) kp;
665 }
667 // Sizing (in words)
668 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
669 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); }
670 static int vtable_start_offset() { return header_size(); }
671 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
672 static int object_size(int extra) { return align_object_size(header_size() + extra); }
674 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
675 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
676 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
678 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
680 address static_field_addr(int offset);
682 OopMapBlock* start_of_nonstatic_oop_maps() const {
683 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
684 }
686 // Allocation profiling support
687 juint alloc_size() const { return _alloc_count * size_helper(); }
688 void set_alloc_size(juint n) {}
690 // Use this to return the size of an instance in heap words:
691 int size_helper() const {
692 return layout_helper_to_size_helper(layout_helper());
693 }
695 // This bit is initialized in classFileParser.cpp.
696 // It is false under any of the following conditions:
697 // - the class is abstract (including any interface)
698 // - the class has a finalizer (if !RegisterFinalizersAtInit)
699 // - the class size is larger than FastAllocateSizeLimit
700 // - the class is java/lang/Class, which cannot be allocated directly
701 bool can_be_fastpath_allocated() const {
702 return !layout_helper_needs_slow_path(layout_helper());
703 }
705 // Java vtable/itable
706 klassVtable* vtable() const; // return new klassVtable wrapper
707 inline methodOop method_at_vtable(int index);
708 klassItable* itable() const; // return new klassItable wrapper
709 methodOop method_at_itable(klassOop holder, int index, TRAPS);
711 // Garbage collection
712 void oop_follow_contents(oop obj);
713 int oop_adjust_pointers(oop obj);
714 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
715 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
717 void follow_weak_klass_links(
718 BoolObjectClosure* is_alive, OopClosure* keep_alive);
719 void release_C_heap_structures();
721 // Parallel Scavenge and Parallel Old
722 PARALLEL_GC_DECLS
724 // Naming
725 const char* signature_name() const;
727 // Iterators
728 int oop_oop_iterate(oop obj, OopClosure* blk) {
729 return oop_oop_iterate_v(obj, blk);
730 }
732 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
733 return oop_oop_iterate_v_m(obj, blk, mr);
734 }
736 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
737 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
738 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
739 MemRegion mr);
741 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
742 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
744 #ifndef SERIALGC
745 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
746 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
748 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
749 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
750 #endif // !SERIALGC
752 private:
753 // initialization state
754 #ifdef ASSERT
755 void set_init_state(ClassState state);
756 #else
757 void set_init_state(ClassState state) { _init_state = state; }
758 #endif
759 void set_rewritten() { _rewritten = true; }
760 void set_init_thread(Thread *thread) { _init_thread = thread; }
762 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
763 // The RedefineClasses() API can cause new method idnums to be needed
764 // which will cause the caches to grow. Safety requires different
765 // cache management logic if the caches can grow instead of just
766 // going from NULL to non-NULL.
767 bool idnum_can_increment() const { return has_been_redefined(); }
768 jmethodID* methods_jmethod_ids_acquire() const
769 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
770 void release_set_methods_jmethod_ids(jmethodID* jmeths)
771 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
773 int* methods_cached_itable_indices_acquire() const
774 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
775 void release_set_methods_cached_itable_indices(int* indices)
776 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
778 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
779 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
780 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
782 // Offsets for memory management
783 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
784 oop* adr_methods() const { return (oop*)&this->_methods;}
785 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
786 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
787 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
788 oop* adr_fields() const { return (oop*)&this->_fields;}
789 oop* adr_constants() const { return (oop*)&this->_constants;}
790 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
791 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
792 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
793 oop* adr_signers() const { return (oop*)&this->_signers;}
794 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
795 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
796 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} // AllowTransitionalJSR292 ONLY
797 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
798 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
799 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
800 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
801 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
802 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
803 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
805 // Static methods that are used to implement member methods where an exposed this pointer
806 // is needed due to possible GCs
807 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
808 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
809 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
810 static void eager_initialize_impl (instanceKlassHandle this_oop);
811 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
812 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
813 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
814 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
815 /* jni_id_for_impl for jfieldID only */
816 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
818 // Returns the array class for the n'th dimension
819 klassOop array_klass_impl(bool or_null, int n, TRAPS);
821 // Returns the array class with this class as element type
822 klassOop array_klass_impl(bool or_null, TRAPS);
824 public:
825 // sharing support
826 virtual void remove_unshareable_info();
827 virtual void shared_symbols_iterate(SymbolClosure* closure);
829 // jvm support
830 jint compute_modifier_flags(TRAPS) const;
832 public:
833 // JVMTI support
834 jint jvmti_class_status() const;
836 public:
837 // Printing
838 void oop_print_value_on(oop obj, outputStream* st);
839 #ifndef PRODUCT
840 void oop_print_on (oop obj, outputStream* st);
842 void print_dependent_nmethods(bool verbose = false);
843 bool is_dependent_nmethod(nmethod* nm);
844 #endif
846 // Verification
847 const char* internal_name() const;
848 void oop_verify_on(oop obj, outputStream* st);
850 #ifndef PRODUCT
851 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
852 #endif
853 };
855 inline methodOop instanceKlass::method_at_vtable(int index) {
856 #ifndef PRODUCT
857 assert(index >= 0, "valid vtable index");
858 if (DebugVtables) {
859 verify_vtable_index(index);
860 }
861 #endif
862 vtableEntry* ve = (vtableEntry*)start_of_vtable();
863 return ve[index].method();
864 }
866 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
867 if (annos == NULL || annos->length() <= idnum) {
868 return NULL;
869 }
870 return typeArrayOop(annos->obj_at(idnum));
871 }
873 // for adding methods
874 // UNSET_IDNUM return means no more ids available
875 inline u2 instanceKlass::next_method_idnum() {
876 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
877 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
878 } else {
879 return _idnum_allocated_count++;
880 }
881 }
884 /* JNIid class for jfieldIDs only */
885 class JNIid: public CHeapObj {
886 friend class VMStructs;
887 private:
888 klassOop _holder;
889 JNIid* _next;
890 int _offset;
891 #ifdef ASSERT
892 bool _is_static_field_id;
893 #endif
895 public:
896 // Accessors
897 klassOop holder() const { return _holder; }
898 int offset() const { return _offset; }
899 JNIid* next() { return _next; }
900 // Constructor
901 JNIid(klassOop holder, int offset, JNIid* next);
902 // Identifier lookup
903 JNIid* find(int offset);
905 bool find_local_field(fieldDescriptor* fd) {
906 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
907 }
909 // Garbage collection support
910 oop* holder_addr() { return (oop*)&_holder; }
911 void oops_do(OopClosure* f);
912 static void deallocate(JNIid* id);
913 // Debugging
914 #ifdef ASSERT
915 bool is_static_field_id() const { return _is_static_field_id; }
916 void set_is_static_field_id() { _is_static_field_id = true; }
917 #endif
918 void verify(klassOop holder);
919 };
922 // If breakpoints are more numerous than just JVMTI breakpoints,
923 // consider compressing this data structure.
924 // It is currently a simple linked list defined in methodOop.hpp.
926 class BreakpointInfo;
929 // A collection point for interesting information about the previous
930 // version(s) of an instanceKlass. This class uses weak references to
931 // the information so that the information may be collected as needed
932 // by the system. If the information is shared, then a regular
933 // reference must be used because a weak reference would be seen as
934 // collectible. A GrowableArray of PreviousVersionNodes is attached
935 // to the instanceKlass as needed. See PreviousVersionWalker below.
936 class PreviousVersionNode : public CHeapObj {
937 private:
938 // A shared ConstantPool is never collected so we'll always have
939 // a reference to it so we can update items in the cache. We'll
940 // have a weak reference to a non-shared ConstantPool until all
941 // of the methods (EMCP or obsolete) have been collected; the
942 // non-shared ConstantPool becomes collectible at that point.
943 jobject _prev_constant_pool; // regular or weak reference
944 bool _prev_cp_is_weak; // true if not a shared ConstantPool
946 // If the previous version of the instanceKlass doesn't have any
947 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
948 // EMCP methods have been collected, then _prev_EMCP_methods can
949 // have a length of zero.
950 GrowableArray<jweak>* _prev_EMCP_methods;
952 public:
953 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
954 GrowableArray<jweak>* prev_EMCP_methods);
955 ~PreviousVersionNode();
956 jobject prev_constant_pool() const {
957 return _prev_constant_pool;
958 }
959 GrowableArray<jweak>* prev_EMCP_methods() const {
960 return _prev_EMCP_methods;
961 }
962 };
965 // A Handle-ized version of PreviousVersionNode.
966 class PreviousVersionInfo : public ResourceObj {
967 private:
968 constantPoolHandle _prev_constant_pool_handle;
969 // If the previous version of the instanceKlass doesn't have any
970 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
971 // methods cannot be collected while we hold a handle,
972 // _prev_EMCP_methods should never have a length of zero.
973 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
975 public:
976 PreviousVersionInfo(PreviousVersionNode *pv_node);
977 ~PreviousVersionInfo();
978 constantPoolHandle prev_constant_pool_handle() const {
979 return _prev_constant_pool_handle;
980 }
981 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
982 return _prev_EMCP_method_handles;
983 }
984 };
987 // Helper object for walking previous versions. This helper cleans up
988 // the Handles that it allocates when the helper object is destroyed.
989 // The PreviousVersionInfo object returned by next_previous_version()
990 // is only valid until a subsequent call to next_previous_version() or
991 // the helper object is destroyed.
992 class PreviousVersionWalker : public StackObj {
993 private:
994 GrowableArray<PreviousVersionNode *>* _previous_versions;
995 int _current_index;
996 // Fields for cleaning up when we are done walking the previous versions:
997 // A HandleMark for the PreviousVersionInfo handles:
998 HandleMark _hm;
1000 // It would be nice to have a ResourceMark field in this helper also,
1001 // but the ResourceMark code says to be careful to delete handles held
1002 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1003 // can't guarantee the order in which the fields are destroyed, we
1004 // have to let the creator of the PreviousVersionWalker object do
1005 // the right thing. Also, adding a ResourceMark here causes an
1006 // include loop.
1008 // A pointer to the current info object so we can handle the deletes.
1009 PreviousVersionInfo * _current_p;
1011 public:
1012 PreviousVersionWalker(instanceKlass *ik);
1013 ~PreviousVersionWalker();
1015 // Return the interesting information for the next previous version
1016 // of the klass. Returns NULL if there are no more previous versions.
1017 PreviousVersionInfo* next_previous_version();
1018 };
1020 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP