Tue, 21 Apr 2009 23:21:04 -0700
6655646: dynamic languages need dynamically linked call sites
Summary: invokedynamic instruction (JSR 292 RI)
Reviewed-by: twisti, 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 // invokedynamic bootstrap method (a java.dyn.MethodHandle)
167 oop _bootstrap_method;
168 // Annotations for this class, or null if none.
169 typeArrayOop _class_annotations;
170 // Annotation objects (byte arrays) for fields, or null if no annotations.
171 // Indices correspond to entries (not indices) in fields array.
172 objArrayOop _fields_annotations;
173 // Annotation objects (byte arrays) for methods, or null if no annotations.
174 // Index is the idnum, which is initially the same as the methods array index.
175 objArrayOop _methods_annotations;
176 // Annotation objects (byte arrays) for methods' parameters, or null if no
177 // such annotations.
178 // Index is the idnum, which is initially the same as the methods array index.
179 objArrayOop _methods_parameter_annotations;
180 // Annotation objects (byte arrays) for methods' default values, or null if no
181 // such annotations.
182 // Index is the idnum, which is initially the same as the methods array index.
183 objArrayOop _methods_default_annotations;
185 //
186 // End of the oop block.
187 //
189 // Number of heapOopSize words used by non-static fields in this klass
190 // (including inherited fields but after header_size()).
191 int _nonstatic_field_size;
192 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
193 int _static_oop_field_size;// number of static oop fields in this klass
194 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
195 bool _is_marked_dependent; // used for marking during flushing and deoptimization
196 bool _rewritten; // methods rewritten.
197 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
198 u2 _minor_version; // minor version number of class file
199 u2 _major_version; // major version number of class file
200 ClassState _init_state; // state of class
201 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
202 int _vtable_len; // length of Java vtable (in words)
203 int _itable_len; // length of Java itable (in words)
204 ReferenceType _reference_type; // reference type
205 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
206 JNIid* _jni_ids; // First JNI identifier for static fields in this class
207 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
208 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
209 nmethodBucket* _dependencies; // list of dependent nmethods
210 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
211 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
212 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
213 // Array of interesting part(s) of the previous version(s) of this
214 // instanceKlass. See PreviousVersionWalker below.
215 GrowableArray<PreviousVersionNode *>* _previous_versions;
216 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
217 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
218 // JVMTI fields can be moved to their own structure - see 6315920
219 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
220 jint _cached_class_file_len; // JVMTI: length of above
221 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
222 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
224 // embedded Java vtable follows here
225 // embedded Java itables follows here
226 // embedded static fields follows here
227 // embedded nonstatic oop-map blocks follows here
229 friend class instanceKlassKlass;
230 friend class SystemDictionary;
232 public:
233 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
234 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
236 // field sizes
237 int nonstatic_field_size() const { return _nonstatic_field_size; }
238 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
240 int static_field_size() const { return _static_field_size; }
241 void set_static_field_size(int size) { _static_field_size = size; }
243 int static_oop_field_size() const { return _static_oop_field_size; }
244 void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
246 // Java vtable
247 int vtable_length() const { return _vtable_len; }
248 void set_vtable_length(int len) { _vtable_len = len; }
250 // Java itable
251 int itable_length() const { return _itable_len; }
252 void set_itable_length(int len) { _itable_len = len; }
254 // array klasses
255 klassOop array_klasses() const { return _array_klasses; }
256 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
258 // methods
259 objArrayOop methods() const { return _methods; }
260 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
261 methodOop method_with_idnum(int idnum);
263 // method ordering
264 typeArrayOop method_ordering() const { return _method_ordering; }
265 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
267 // interfaces
268 objArrayOop local_interfaces() const { return _local_interfaces; }
269 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
270 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
271 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
273 // fields
274 // Field info extracted from the class file and stored
275 // as an array of 7 shorts
276 enum FieldOffset {
277 access_flags_offset = 0,
278 name_index_offset = 1,
279 signature_index_offset = 2,
280 initval_index_offset = 3,
281 low_offset = 4,
282 high_offset = 5,
283 generic_signature_offset = 6,
284 next_offset = 7
285 };
287 typeArrayOop fields() const { return _fields; }
288 int offset_from_fields( int index ) const {
289 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
290 fields()->ushort_at(index + high_offset) );
291 }
293 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
295 // inner classes
296 typeArrayOop inner_classes() const { return _inner_classes; }
297 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
299 enum InnerClassAttributeOffset {
300 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
301 inner_class_inner_class_info_offset = 0,
302 inner_class_outer_class_info_offset = 1,
303 inner_class_inner_name_offset = 2,
304 inner_class_access_flags_offset = 3,
305 inner_class_next_offset = 4
306 };
308 // method override check
309 bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS);
311 // package
312 bool is_same_class_package(klassOop class2);
313 bool is_same_class_package(oop classloader2, symbolOop classname2);
314 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
316 // find an enclosing class (defined where original code was, in jvm.cpp!)
317 klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) {
318 instanceKlassHandle self(THREAD, this->as_klassOop());
319 return compute_enclosing_class_impl(self, simple_name_result, THREAD);
320 }
321 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
322 symbolOop& simple_name_result, TRAPS);
324 // tell if two classes have the same enclosing class (at package level)
325 bool is_same_package_member(klassOop class2, TRAPS) {
326 instanceKlassHandle self(THREAD, this->as_klassOop());
327 return is_same_package_member_impl(self, class2, THREAD);
328 }
329 static bool is_same_package_member_impl(instanceKlassHandle self,
330 klassOop class2, TRAPS);
332 // initialization state
333 bool is_loaded() const { return _init_state >= loaded; }
334 bool is_linked() const { return _init_state >= linked; }
335 bool is_initialized() const { return _init_state == fully_initialized; }
336 bool is_not_initialized() const { return _init_state < being_initialized; }
337 bool is_being_initialized() const { return _init_state == being_initialized; }
338 bool is_in_error_state() const { return _init_state == initialization_error; }
339 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
340 int get_init_state() { return _init_state; } // Useful for debugging
341 bool is_rewritten() const { return _rewritten; }
343 // marking
344 bool is_marked_dependent() const { return _is_marked_dependent; }
345 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
347 // initialization (virtuals from Klass)
348 bool should_be_initialized() const; // means that initialize should be called
349 void initialize(TRAPS);
350 void link_class(TRAPS);
351 bool link_class_or_fail(TRAPS); // returns false on failure
352 void unlink_class();
353 void rewrite_class(TRAPS);
354 methodOop class_initializer();
356 // set the class to initialized if no static initializer is present
357 void eager_initialize(Thread *thread);
359 // reference type
360 ReferenceType reference_type() const { return _reference_type; }
361 void set_reference_type(ReferenceType t) { _reference_type = t; }
363 // find local field, returns true if found
364 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
365 // find field in direct superinterfaces, returns the interface in which the field is defined
366 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
367 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
368 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
369 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
370 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
372 // find a non-static or static field given its offset within the class.
373 bool contains_field_offset(int offset) {
374 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
375 }
377 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
378 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
380 // find a local method (returns NULL if not found)
381 methodOop find_method(symbolOop name, symbolOop signature) const;
382 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
384 // lookup operation (returns NULL if not found)
385 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
387 // lookup a method in all the interfaces that this class implements
388 // (returns NULL if not found)
389 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
391 // constant pool
392 constantPoolOop constants() const { return _constants; }
393 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
395 // class loader
396 oop class_loader() const { return _class_loader; }
397 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
399 // protection domain
400 oop protection_domain() { return _protection_domain; }
401 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
403 // host class
404 oop host_klass() const { return _host_klass; }
405 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
406 bool is_anonymous() const { return _host_klass != NULL; }
408 // signers
409 objArrayOop signers() const { return _signers; }
410 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
412 // source file name
413 symbolOop source_file_name() const { return _source_file_name; }
414 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
416 // minor and major version numbers of class file
417 u2 minor_version() const { return _minor_version; }
418 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
419 u2 major_version() const { return _major_version; }
420 void set_major_version(u2 major_version) { _major_version = major_version; }
422 // source debug extension
423 symbolOop source_debug_extension() const { return _source_debug_extension; }
424 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
426 // nonstatic oop-map blocks
427 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
428 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
430 // RedefineClasses() support for previous versions:
431 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
432 int emcp_method_count);
433 bool has_previous_version() const;
434 void init_previous_versions() {
435 _previous_versions = NULL;
436 }
437 GrowableArray<PreviousVersionNode *>* previous_versions() const {
438 return _previous_versions;
439 }
441 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
442 void set_cached_class_file(unsigned char *class_file_bytes,
443 jint class_file_len) { _cached_class_file_len = class_file_len;
444 _cached_class_file_bytes = class_file_bytes; }
445 jint get_cached_class_file_len() { return _cached_class_file_len; }
446 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
448 // JVMTI: Support for caching of field indices, types, and offsets
449 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
450 _jvmti_cached_class_field_map = descriptor;
451 }
452 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
453 return _jvmti_cached_class_field_map;
454 }
456 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
457 inline u2 next_method_idnum();
458 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
460 // generics support
461 symbolOop generic_signature() const { return _generic_signature; }
462 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
463 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
464 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
465 void set_enclosing_method_indices(u2 class_index,
466 u2 method_index) { _enclosing_method_class_index = class_index;
467 _enclosing_method_method_index = method_index; }
469 // JSR 292 support
470 oop bootstrap_method() const { return _bootstrap_method; }
471 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); }
473 // jmethodID support
474 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum,
475 jmethodID new_id, jmethodID* new_jmeths);
476 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
477 jmethodID jmethod_id_or_null(methodOop method);
479 // cached itable index support
480 void set_cached_itable_index(size_t idnum, int index);
481 int cached_itable_index(size_t idnum);
483 // annotations support
484 typeArrayOop class_annotations() const { return _class_annotations; }
485 objArrayOop fields_annotations() const { return _fields_annotations; }
486 objArrayOop methods_annotations() const { return _methods_annotations; }
487 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
488 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
489 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
490 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
491 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
492 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
493 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
494 typeArrayOop get_method_annotations_of(int idnum)
495 { return get_method_annotations_from(idnum, _methods_annotations); }
496 typeArrayOop get_method_parameter_annotations_of(int idnum)
497 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
498 typeArrayOop get_method_default_annotations_of(int idnum)
499 { return get_method_annotations_from(idnum, _methods_default_annotations); }
500 void set_method_annotations_of(int idnum, typeArrayOop anno)
501 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
502 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
503 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
504 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
505 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
507 // allocation
508 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
509 instanceOop allocate_instance(TRAPS);
510 instanceOop allocate_permanent_instance(TRAPS);
512 // additional member function to return a handle
513 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
515 objArrayOop allocate_objArray(int n, int length, TRAPS);
516 // Helper function
517 static instanceOop register_finalizer(instanceOop i, TRAPS);
519 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
520 // if not, throw either an Error or an Exception.
521 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
523 // initialization
524 void call_class_initializer(TRAPS);
525 void set_initialization_state_and_notify(ClassState state, TRAPS);
527 // OopMapCache support
528 OopMapCache* oop_map_cache() { return _oop_map_cache; }
529 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
530 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
532 // JNI identifier support (for static fields - for jni performance)
533 JNIid* jni_ids() { return _jni_ids; }
534 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
535 JNIid* jni_id_for(int offset);
537 // maintenance of deoptimization dependencies
538 int mark_dependent_nmethods(DepChange& changes);
539 void add_dependent_nmethod(nmethod* nm);
540 void remove_dependent_nmethod(nmethod* nm);
542 // On-stack replacement support
543 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
544 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
545 void add_osr_nmethod(nmethod* n);
546 void remove_osr_nmethod(nmethod* n);
547 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
549 // Breakpoint support (see methods on methodOop for details)
550 BreakpointInfo* breakpoints() const { return _breakpoints; };
551 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
553 // support for stub routines
554 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
555 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
557 // subclass/subinterface checks
558 bool implements_interface(klassOop k) const;
560 // Access to implementors of an interface. We only store the count
561 // of implementors, and in case, there are only a few
562 // implementors, we store them in a short list.
563 // This accessor returns NULL if we walk off the end of the list.
564 klassOop implementor(int i) const {
565 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
566 }
567 int nof_implementors() const { return _nof_implementors; }
568 void add_implementor(klassOop k); // k is a new class that implements this interface
569 void init_implementor(); // initialize
571 // link this class into the implementors list of every interface it implements
572 void process_interfaces(Thread *thread);
574 // virtual operations from Klass
575 bool is_leaf_class() const { return _subklass == NULL; }
576 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
577 bool compute_is_subtype_of(klassOop k);
578 bool can_be_primary_super_slow() const;
579 klassOop java_super() const { return super(); }
580 int oop_size(oop obj) const { return size_helper(); }
581 int klass_oop_size() const { return object_size(); }
582 bool oop_is_instance_slow() const { return true; }
584 // Iterators
585 void do_local_static_fields(FieldClosure* cl);
586 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
587 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
589 void methods_do(void f(methodOop method));
590 void array_klasses_do(void f(klassOop k));
591 void with_array_klasses_do(void f(klassOop k));
592 bool super_types_do(SuperTypeClosure* blk);
594 // Casting from klassOop
595 static instanceKlass* cast(klassOop k) {
596 Klass* kp = k->klass_part();
597 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
598 return (instanceKlass*) kp;
599 }
601 // Sizing (in words)
602 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
603 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
604 static int vtable_start_offset() { return header_size(); }
605 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
606 static int object_size(int extra) { return align_object_size(header_size() + extra); }
608 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
609 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
610 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
612 // Static field offset is an offset into the Heap, should be converted by
613 // based on UseCompressedOop for traversal
614 HeapWord* start_of_static_fields() const {
615 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
616 }
618 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
620 int offset_of_static_fields() const {
621 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
622 }
624 OopMapBlock* start_of_nonstatic_oop_maps() const {
625 return (OopMapBlock*) (start_of_static_fields() + static_field_size());
626 }
628 // Allocation profiling support
629 juint alloc_size() const { return _alloc_count * size_helper(); }
630 void set_alloc_size(juint n) {}
632 // Use this to return the size of an instance in heap words:
633 int size_helper() const {
634 return layout_helper_to_size_helper(layout_helper());
635 }
637 // This bit is initialized in classFileParser.cpp.
638 // It is false under any of the following conditions:
639 // - the class is abstract (including any interface)
640 // - the class has a finalizer (if !RegisterFinalizersAtInit)
641 // - the class size is larger than FastAllocateSizeLimit
642 // - the class is java/lang/Class, which cannot be allocated directly
643 bool can_be_fastpath_allocated() const {
644 return !layout_helper_needs_slow_path(layout_helper());
645 }
647 // Java vtable/itable
648 klassVtable* vtable() const; // return new klassVtable wrapper
649 inline methodOop method_at_vtable(int index);
650 klassItable* itable() const; // return new klassItable wrapper
651 methodOop method_at_itable(klassOop holder, int index, TRAPS);
653 // Garbage collection
654 void oop_follow_contents(oop obj);
655 void follow_static_fields();
656 void adjust_static_fields();
657 int oop_adjust_pointers(oop obj);
658 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
659 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
661 void follow_weak_klass_links(
662 BoolObjectClosure* is_alive, OopClosure* keep_alive);
663 void release_C_heap_structures();
665 // Parallel Scavenge and Parallel Old
666 PARALLEL_GC_DECLS
668 #ifndef SERIALGC
669 // Parallel Scavenge
670 void copy_static_fields(PSPromotionManager* pm);
671 void push_static_fields(PSPromotionManager* pm);
673 // Parallel Old
674 void follow_static_fields(ParCompactionManager* cm);
675 void copy_static_fields(ParCompactionManager* cm);
676 void update_static_fields();
677 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
678 #endif // SERIALGC
680 // Naming
681 char* signature_name() const;
683 // Iterators
684 int oop_oop_iterate(oop obj, OopClosure* blk) {
685 return oop_oop_iterate_v(obj, blk);
686 }
688 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
689 return oop_oop_iterate_v_m(obj, blk, mr);
690 }
692 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
693 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
694 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
695 MemRegion mr);
697 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
698 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
700 #ifndef SERIALGC
701 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
702 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
704 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
705 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
706 #endif // !SERIALGC
708 void iterate_static_fields(OopClosure* closure);
709 void iterate_static_fields(OopClosure* closure, MemRegion mr);
711 private:
712 // initialization state
713 #ifdef ASSERT
714 void set_init_state(ClassState state);
715 #else
716 void set_init_state(ClassState state) { _init_state = state; }
717 #endif
718 void set_rewritten() { _rewritten = true; }
719 void set_init_thread(Thread *thread) { _init_thread = thread; }
721 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
722 jmethodID* methods_jmethod_ids_acquire() const
723 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
724 void release_set_methods_jmethod_ids(jmethodID* jmeths)
725 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
727 int* methods_cached_itable_indices_acquire() const
728 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
729 void release_set_methods_cached_itable_indices(int* indices)
730 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
732 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
733 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
734 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
736 // Offsets for memory management
737 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
738 oop* adr_methods() const { return (oop*)&this->_methods;}
739 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
740 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
741 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
742 oop* adr_fields() const { return (oop*)&this->_fields;}
743 oop* adr_constants() const { return (oop*)&this->_constants;}
744 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
745 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
746 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
747 oop* adr_signers() const { return (oop*)&this->_signers;}
748 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
749 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
750 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
751 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
752 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
753 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;}
754 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
755 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
756 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
757 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
758 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
759 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
760 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
762 // Static methods that are used to implement member methods where an exposed this pointer
763 // is needed due to possible GCs
764 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
765 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
766 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
767 static void eager_initialize_impl (instanceKlassHandle this_oop);
768 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
769 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
770 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
771 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
772 /* jni_id_for_impl for jfieldID only */
773 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
775 // Returns the array class for the n'th dimension
776 klassOop array_klass_impl(bool or_null, int n, TRAPS);
778 // Returns the array class with this class as element type
779 klassOop array_klass_impl(bool or_null, TRAPS);
781 public:
782 // sharing support
783 virtual void remove_unshareable_info();
784 void field_names_and_sigs_iterate(OopClosure* closure);
786 // jvm support
787 jint compute_modifier_flags(TRAPS) const;
789 public:
790 // JVMTI support
791 jint jvmti_class_status() const;
793 #ifndef PRODUCT
794 public:
795 // Printing
796 void oop_print_on (oop obj, outputStream* st);
797 void oop_print_value_on(oop obj, outputStream* st);
799 void print_dependent_nmethods(bool verbose = false);
800 bool is_dependent_nmethod(nmethod* nm);
801 #endif
803 public:
804 // Verification
805 const char* internal_name() const;
806 void oop_verify_on(oop obj, outputStream* st);
808 #ifndef PRODUCT
809 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
810 #endif
811 };
813 inline methodOop instanceKlass::method_at_vtable(int index) {
814 #ifndef PRODUCT
815 assert(index >= 0, "valid vtable index");
816 if (DebugVtables) {
817 verify_vtable_index(index);
818 }
819 #endif
820 vtableEntry* ve = (vtableEntry*)start_of_vtable();
821 return ve[index].method();
822 }
824 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
825 if (annos == NULL || annos->length() <= idnum) {
826 return NULL;
827 }
828 return typeArrayOop(annos->obj_at(idnum));
829 }
831 // for adding methods
832 // UNSET_IDNUM return means no more ids available
833 inline u2 instanceKlass::next_method_idnum() {
834 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
835 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
836 } else {
837 return _idnum_allocated_count++;
838 }
839 }
842 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
844 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
845 private:
846 jushort _offset; // Offset of first oop in oop-map block
847 jushort _length; // Length of oop-map block
848 public:
849 // Accessors
850 jushort offset() const { return _offset; }
851 void set_offset(jushort offset) { _offset = offset; }
853 jushort length() const { return _length; }
854 void set_length(jushort length) { _length = length; }
855 };
857 /* JNIid class for jfieldIDs only */
858 class JNIid: public CHeapObj {
859 friend class VMStructs;
860 private:
861 klassOop _holder;
862 JNIid* _next;
863 int _offset;
864 #ifdef ASSERT
865 bool _is_static_field_id;
866 #endif
868 public:
869 // Accessors
870 klassOop holder() const { return _holder; }
871 int offset() const { return _offset; }
872 JNIid* next() { return _next; }
873 // Constructor
874 JNIid(klassOop holder, int offset, JNIid* next);
875 // Identifier lookup
876 JNIid* find(int offset);
878 // Garbage collection support
879 oop* holder_addr() { return (oop*)&_holder; }
880 void oops_do(OopClosure* f);
881 static void deallocate(JNIid* id);
882 // Debugging
883 #ifdef ASSERT
884 bool is_static_field_id() const { return _is_static_field_id; }
885 void set_is_static_field_id() { _is_static_field_id = true; }
886 #endif
887 void verify(klassOop holder);
888 };
891 // If breakpoints are more numerous than just JVMTI breakpoints,
892 // consider compressing this data structure.
893 // It is currently a simple linked list defined in methodOop.hpp.
895 class BreakpointInfo;
898 // A collection point for interesting information about the previous
899 // version(s) of an instanceKlass. This class uses weak references to
900 // the information so that the information may be collected as needed
901 // by the system. If the information is shared, then a regular
902 // reference must be used because a weak reference would be seen as
903 // collectible. A GrowableArray of PreviousVersionNodes is attached
904 // to the instanceKlass as needed. See PreviousVersionWalker below.
905 class PreviousVersionNode : public CHeapObj {
906 private:
907 // A shared ConstantPool is never collected so we'll always have
908 // a reference to it so we can update items in the cache. We'll
909 // have a weak reference to a non-shared ConstantPool until all
910 // of the methods (EMCP or obsolete) have been collected; the
911 // non-shared ConstantPool becomes collectible at that point.
912 jobject _prev_constant_pool; // regular or weak reference
913 bool _prev_cp_is_weak; // true if not a shared ConstantPool
915 // If the previous version of the instanceKlass doesn't have any
916 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
917 // EMCP methods have been collected, then _prev_EMCP_methods can
918 // have a length of zero.
919 GrowableArray<jweak>* _prev_EMCP_methods;
921 public:
922 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
923 GrowableArray<jweak>* prev_EMCP_methods);
924 ~PreviousVersionNode();
925 jobject prev_constant_pool() const {
926 return _prev_constant_pool;
927 }
928 GrowableArray<jweak>* prev_EMCP_methods() const {
929 return _prev_EMCP_methods;
930 }
931 };
934 // A Handle-ized version of PreviousVersionNode.
935 class PreviousVersionInfo : public ResourceObj {
936 private:
937 constantPoolHandle _prev_constant_pool_handle;
938 // If the previous version of the instanceKlass doesn't have any
939 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
940 // methods cannot be collected while we hold a handle,
941 // _prev_EMCP_methods should never have a length of zero.
942 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
944 public:
945 PreviousVersionInfo(PreviousVersionNode *pv_node);
946 ~PreviousVersionInfo();
947 constantPoolHandle prev_constant_pool_handle() const {
948 return _prev_constant_pool_handle;
949 }
950 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
951 return _prev_EMCP_method_handles;
952 }
953 };
956 // Helper object for walking previous versions. This helper cleans up
957 // the Handles that it allocates when the helper object is destroyed.
958 // The PreviousVersionInfo object returned by next_previous_version()
959 // is only valid until a subsequent call to next_previous_version() or
960 // the helper object is destroyed.
961 class PreviousVersionWalker : public StackObj {
962 private:
963 GrowableArray<PreviousVersionNode *>* _previous_versions;
964 int _current_index;
965 // Fields for cleaning up when we are done walking the previous versions:
966 // A HandleMark for the PreviousVersionInfo handles:
967 HandleMark _hm;
969 // It would be nice to have a ResourceMark field in this helper also,
970 // but the ResourceMark code says to be careful to delete handles held
971 // in GrowableArrays _before_ deleting the GrowableArray. Since we
972 // can't guarantee the order in which the fields are destroyed, we
973 // have to let the creator of the PreviousVersionWalker object do
974 // the right thing. Also, adding a ResourceMark here causes an
975 // include loop.
977 // A pointer to the current info object so we can handle the deletes.
978 PreviousVersionInfo * _current_p;
980 public:
981 PreviousVersionWalker(instanceKlass *ik);
982 ~PreviousVersionWalker();
984 // Return the interesting information for the next previous version
985 // of the klass. Returns NULL if there are no more previous versions.
986 PreviousVersionInfo* next_previous_version();
987 };