Tue, 11 Nov 2014 11:05:41 +0100
8056071: compiler/whitebox/IsMethodCompilableTest.java fails with 'method() is not compilable after 3 iterations'
Summary: Always use MDO if valid and always compile trivial methods with C1 if available.
Reviewed-by: kvn, iveresov
1 /*
2 * Copyright (c) 1997, 2014, 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.
18 *
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.
22 *
23 */
25 #ifndef SHARE_VM_OOPS_KLASS_HPP
26 #define SHARE_VM_OOPS_KLASS_HPP
28 #include "memory/genOopClosures.hpp"
29 #include "memory/iterator.hpp"
30 #include "memory/memRegion.hpp"
31 #include "memory/specialized_oop_closures.hpp"
32 #include "oops/klassPS.hpp"
33 #include "oops/metadata.hpp"
34 #include "oops/oop.hpp"
35 #include "trace/traceMacros.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/macros.hpp"
38 #if INCLUDE_ALL_GCS
39 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp"
40 #include "gc_implementation/g1/g1OopClosures.hpp"
41 #include "gc_implementation/parNew/parOopClosures.hpp"
42 #endif // INCLUDE_ALL_GCS
44 //
45 // A Klass provides:
46 // 1: language level class object (method dictionary etc.)
47 // 2: provide vm dispatch behavior for the object
48 // Both functions are combined into one C++ class.
50 // One reason for the oop/klass dichotomy in the implementation is
51 // that we don't want a C++ vtbl pointer in every object. Thus,
52 // normal oops don't have any virtual functions. Instead, they
53 // forward all "virtual" functions to their klass, which does have
54 // a vtbl and does the C++ dispatch depending on the object's
55 // actual type. (See oop.inline.hpp for some of the forwarding code.)
56 // ALL FUNCTIONS IMPLEMENTING THIS DISPATCH ARE PREFIXED WITH "oop_"!
58 // Klass layout:
59 // [C++ vtbl ptr ] (contained in Metadata)
60 // [layout_helper ]
61 // [super_check_offset ] for fast subtype checks
62 // [name ]
63 // [secondary_super_cache] for fast subtype checks
64 // [secondary_supers ] array of 2ndary supertypes
65 // [primary_supers 0]
66 // [primary_supers 1]
67 // [primary_supers 2]
68 // ...
69 // [primary_supers 7]
70 // [java_mirror ]
71 // [super ]
72 // [subklass ] first subclass
73 // [next_sibling ] link to chain additional subklasses
74 // [next_link ]
75 // [class_loader_data]
76 // [modifier_flags]
77 // [access_flags ]
78 // [last_biased_lock_bulk_revocation_time] (64 bits)
79 // [prototype_header]
80 // [biased_lock_revocation_count]
81 // [_modified_oops]
82 // [_accumulated_modified_oops]
83 // [trace_id]
86 // Forward declarations.
87 template <class T> class Array;
88 template <class T> class GrowableArray;
89 class ClassLoaderData;
90 class klassVtable;
91 class ParCompactionManager;
92 class KlassSizeStats;
93 class fieldDescriptor;
95 class Klass : public Metadata {
96 friend class VMStructs;
97 protected:
98 // note: put frequently-used fields together at start of klass structure
99 // for better cache behavior (may not make much of a difference but sure won't hurt)
100 enum { _primary_super_limit = 8 };
102 // The "layout helper" is a combined descriptor of object layout.
103 // For klasses which are neither instance nor array, the value is zero.
104 //
105 // For instances, layout helper is a positive number, the instance size.
106 // This size is already passed through align_object_size and scaled to bytes.
107 // The low order bit is set if instances of this class cannot be
108 // allocated using the fastpath.
109 //
110 // For arrays, layout helper is a negative number, containing four
111 // distinct bytes, as follows:
112 // MSB:[tag, hsz, ebt, log2(esz)]:LSB
113 // where:
114 // tag is 0x80 if the elements are oops, 0xC0 if non-oops
115 // hsz is array header size in bytes (i.e., offset of first element)
116 // ebt is the BasicType of the elements
117 // esz is the element size in bytes
118 // This packed word is arranged so as to be quickly unpacked by the
119 // various fast paths that use the various subfields.
120 //
121 // The esz bits can be used directly by a SLL instruction, without masking.
122 //
123 // Note that the array-kind tag looks like 0x00 for instance klasses,
124 // since their length in bytes is always less than 24Mb.
125 //
126 // Final note: This comes first, immediately after C++ vtable,
127 // because it is frequently queried.
128 jint _layout_helper;
130 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers
131 // and _primary_supers all help make fast subtype checks. See big discussion
132 // in doc/server_compiler/checktype.txt
133 //
134 // Where to look to observe a supertype (it is &_secondary_super_cache for
135 // secondary supers, else is &_primary_supers[depth()].
136 juint _super_check_offset;
138 // Class name. Instance classes: java/lang/String, etc. Array classes: [I,
139 // [Ljava/lang/String;, etc. Set to zero for all other kinds of classes.
140 Symbol* _name;
142 // Cache of last observed secondary supertype
143 Klass* _secondary_super_cache;
144 // Array of all secondary supertypes
145 Array<Klass*>* _secondary_supers;
146 // Ordered list of all primary supertypes
147 Klass* _primary_supers[_primary_super_limit];
148 // java/lang/Class instance mirroring this class
149 oop _java_mirror;
150 // Superclass
151 Klass* _super;
152 // First subclass (NULL if none); _subklass->next_sibling() is next one
153 Klass* _subklass;
154 // Sibling link (or NULL); links all subklasses of a klass
155 Klass* _next_sibling;
157 // All klasses loaded by a class loader are chained through these links
158 Klass* _next_link;
160 // The VM's representation of the ClassLoader used to load this class.
161 // Provide access the corresponding instance java.lang.ClassLoader.
162 ClassLoaderData* _class_loader_data;
164 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers.
165 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
167 // Biased locking implementation and statistics
168 // (the 64-bit chunk goes first, to avoid some fragmentation)
169 jlong _last_biased_lock_bulk_revocation_time;
170 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type
171 jint _biased_lock_revocation_count;
173 TRACE_DEFINE_KLASS_TRACE_ID;
175 // Remembered sets support for the oops in the klasses.
176 jbyte _modified_oops; // Card Table Equivalent (YC/CMS support)
177 jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support)
179 private:
180 // This is an index into FileMapHeader::_classpath_entry_table[], to
181 // associate this class with the JAR file where it's loaded from during
182 // dump time. If a class is not loaded from the shared archive, this field is
183 // -1.
184 jshort _shared_class_path_index;
186 friend class SharedClassUtil;
187 protected:
189 // Constructor
190 Klass();
192 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw();
194 public:
195 enum MethodLookupMode { normal, skip_overpass, skip_defaults };
197 bool is_klass() const volatile { return true; }
199 // super
200 Klass* super() const { return _super; }
201 void set_super(Klass* k) { _super = k; }
203 // initializes _super link, _primary_supers & _secondary_supers arrays
204 void initialize_supers(Klass* k, TRAPS);
205 void initialize_supers_impl1(Klass* k);
206 void initialize_supers_impl2(Klass* k);
208 // klass-specific helper for initializing _secondary_supers
209 virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
211 // java_super is the Java-level super type as specified by Class.getSuperClass.
212 virtual Klass* java_super() const { return NULL; }
214 juint super_check_offset() const { return _super_check_offset; }
215 void set_super_check_offset(juint o) { _super_check_offset = o; }
217 Klass* secondary_super_cache() const { return _secondary_super_cache; }
218 void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; }
220 Array<Klass*>* secondary_supers() const { return _secondary_supers; }
221 void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; }
223 // Return the element of the _super chain of the given depth.
224 // If there is no such element, return either NULL or this.
225 Klass* primary_super_of_depth(juint i) const {
226 assert(i < primary_super_limit(), "oob");
227 Klass* super = _primary_supers[i];
228 assert(super == NULL || super->super_depth() == i, "correct display");
229 return super;
230 }
232 // Can this klass be a primary super? False for interfaces and arrays of
233 // interfaces. False also for arrays or classes with long super chains.
234 bool can_be_primary_super() const {
235 const juint secondary_offset = in_bytes(secondary_super_cache_offset());
236 return super_check_offset() != secondary_offset;
237 }
238 virtual bool can_be_primary_super_slow() const;
240 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit].
241 juint super_depth() const {
242 if (!can_be_primary_super()) {
243 return primary_super_limit();
244 } else {
245 juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*);
246 assert(d < primary_super_limit(), "oob");
247 assert(_primary_supers[d] == this, "proper init");
248 return d;
249 }
250 }
252 // store an oop into a field of a Klass
253 void klass_oop_store(oop* p, oop v);
254 void klass_oop_store(volatile oop* p, oop v);
256 // java mirror
257 oop java_mirror() const { return _java_mirror; }
258 void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); }
260 // modifier flags
261 jint modifier_flags() const { return _modifier_flags; }
262 void set_modifier_flags(jint flags) { _modifier_flags = flags; }
264 // size helper
265 int layout_helper() const { return _layout_helper; }
266 void set_layout_helper(int lh) { _layout_helper = lh; }
268 // Note: for instances layout_helper() may include padding.
269 // Use InstanceKlass::contains_field_offset to classify field offsets.
271 // sub/superklass links
272 InstanceKlass* superklass() const;
273 Klass* subklass() const;
274 Klass* next_sibling() const;
275 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list
277 void set_next_link(Klass* k) { _next_link = k; }
278 Klass* next_link() const { return _next_link; } // The next klass defined by the class loader.
280 // class loader data
281 ClassLoaderData* class_loader_data() const { return _class_loader_data; }
282 void set_class_loader_data(ClassLoaderData* loader_data) { _class_loader_data = loader_data; }
284 // The Klasses are not placed in the Heap, so the Card Table or
285 // the Mod Union Table can't be used to mark when klasses have modified oops.
286 // The CT and MUT bits saves this information for the individual Klasses.
287 void record_modified_oops() { _modified_oops = 1; }
288 void clear_modified_oops() { _modified_oops = 0; }
289 bool has_modified_oops() { return _modified_oops == 1; }
291 void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = 1; }
292 void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; }
293 bool has_accumulated_modified_oops() { return _accumulated_modified_oops == 1; }
295 int shared_classpath_index() const {
296 return _shared_class_path_index;
297 };
299 void set_shared_classpath_index(int index) {
300 _shared_class_path_index = index;
301 };
304 protected: // internal accessors
305 Klass* subklass_oop() const { return _subklass; }
306 Klass* next_sibling_oop() const { return _next_sibling; }
307 void set_subklass(Klass* s);
308 void set_next_sibling(Klass* s);
310 public:
312 // Compiler support
313 static ByteSize super_offset() { return in_ByteSize(offset_of(Klass, _super)); }
314 static ByteSize super_check_offset_offset() { return in_ByteSize(offset_of(Klass, _super_check_offset)); }
315 static ByteSize primary_supers_offset() { return in_ByteSize(offset_of(Klass, _primary_supers)); }
316 static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); }
317 static ByteSize secondary_supers_offset() { return in_ByteSize(offset_of(Klass, _secondary_supers)); }
318 static ByteSize java_mirror_offset() { return in_ByteSize(offset_of(Klass, _java_mirror)); }
319 static ByteSize modifier_flags_offset() { return in_ByteSize(offset_of(Klass, _modifier_flags)); }
320 static ByteSize layout_helper_offset() { return in_ByteSize(offset_of(Klass, _layout_helper)); }
321 static ByteSize access_flags_offset() { return in_ByteSize(offset_of(Klass, _access_flags)); }
323 // Unpacking layout_helper:
324 enum {
325 _lh_neutral_value = 0, // neutral non-array non-instance value
326 _lh_instance_slow_path_bit = 0x01,
327 _lh_log2_element_size_shift = BitsPerByte*0,
328 _lh_log2_element_size_mask = BitsPerLong-1,
329 _lh_element_type_shift = BitsPerByte*1,
330 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask
331 _lh_header_size_shift = BitsPerByte*2,
332 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask
333 _lh_array_tag_bits = 2,
334 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits,
335 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30
336 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30
337 };
339 static int layout_helper_size_in_bytes(jint lh) {
340 assert(lh > (jint)_lh_neutral_value, "must be instance");
341 return (int) lh & ~_lh_instance_slow_path_bit;
342 }
343 static bool layout_helper_needs_slow_path(jint lh) {
344 assert(lh > (jint)_lh_neutral_value, "must be instance");
345 return (lh & _lh_instance_slow_path_bit) != 0;
346 }
347 static bool layout_helper_is_instance(jint lh) {
348 return (jint)lh > (jint)_lh_neutral_value;
349 }
350 static bool layout_helper_is_array(jint lh) {
351 return (jint)lh < (jint)_lh_neutral_value;
352 }
353 static bool layout_helper_is_typeArray(jint lh) {
354 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift);
355 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift);
356 }
357 static bool layout_helper_is_objArray(jint lh) {
358 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);
359 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift);
360 }
361 static int layout_helper_header_size(jint lh) {
362 assert(lh < (jint)_lh_neutral_value, "must be array");
363 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask;
364 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity");
365 return hsize;
366 }
367 static BasicType layout_helper_element_type(jint lh) {
368 assert(lh < (jint)_lh_neutral_value, "must be array");
369 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask;
370 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity");
371 return (BasicType) btvalue;
372 }
373 static int layout_helper_log2_element_size(jint lh) {
374 assert(lh < (jint)_lh_neutral_value, "must be array");
375 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
376 assert(l2esz <= LogBitsPerLong,
377 err_msg("sanity. l2esz: 0x%x for lh: 0x%x", (uint)l2esz, (uint)lh));
378 return l2esz;
379 }
380 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) {
381 return (tag << _lh_array_tag_shift)
382 | (hsize << _lh_header_size_shift)
383 | ((int)etype << _lh_element_type_shift)
384 | (log2_esize << _lh_log2_element_size_shift);
385 }
386 static jint instance_layout_helper(jint size, bool slow_path_flag) {
387 return (size << LogHeapWordSize)
388 | (slow_path_flag ? _lh_instance_slow_path_bit : 0);
389 }
390 static int layout_helper_to_size_helper(jint lh) {
391 assert(lh > (jint)_lh_neutral_value, "must be instance");
392 // Note that the following expression discards _lh_instance_slow_path_bit.
393 return lh >> LogHeapWordSize;
394 }
395 // Out-of-line version computes everything based on the etype:
396 static jint array_layout_helper(BasicType etype);
398 // What is the maximum number of primary superclasses any klass can have?
399 #ifdef PRODUCT
400 static juint primary_super_limit() { return _primary_super_limit; }
401 #else
402 static juint primary_super_limit() {
403 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob");
404 return FastSuperclassLimit;
405 }
406 #endif
408 // vtables
409 virtual klassVtable* vtable() const { return NULL; }
410 virtual int vtable_length() const { return 0; }
412 // subclass check
413 bool is_subclass_of(const Klass* k) const;
414 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it
415 bool is_subtype_of(Klass* k) const {
416 juint off = k->super_check_offset();
417 Klass* sup = *(Klass**)( (address)this + off );
418 const juint secondary_offset = in_bytes(secondary_super_cache_offset());
419 if (sup == k) {
420 return true;
421 } else if (off != secondary_offset) {
422 return false;
423 } else {
424 return search_secondary_supers(k);
425 }
426 }
427 bool search_secondary_supers(Klass* k) const;
429 // Find LCA in class hierarchy
430 Klass *LCA( Klass *k );
432 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
433 // if not, throw either an Error or an Exception.
434 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
436 // array copying
437 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
439 // tells if the class should be initialized
440 virtual bool should_be_initialized() const { return false; }
441 // initializes the klass
442 virtual void initialize(TRAPS);
443 // lookup operation for MethodLookupCache
444 friend class MethodLookupCache;
445 virtual Klass* find_field(Symbol* name, Symbol* signature, fieldDescriptor* fd) const;
446 virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const;
447 public:
448 Method* lookup_method(Symbol* name, Symbol* signature) const {
449 return uncached_lookup_method(name, signature, normal);
450 }
452 // array class with specific rank
453 Klass* array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); }
455 // array class with this klass as element type
456 Klass* array_klass(TRAPS) { return array_klass_impl(false, THREAD); }
458 // These will return NULL instead of allocating on the heap:
459 // NB: these can block for a mutex, like other functions with TRAPS arg.
460 Klass* array_klass_or_null(int rank);
461 Klass* array_klass_or_null();
463 virtual oop protection_domain() const = 0;
465 oop class_loader() const;
467 virtual oop klass_holder() const { return class_loader(); }
469 protected:
470 virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS);
471 virtual Klass* array_klass_impl(bool or_null, TRAPS);
473 public:
474 // CDS support - remove and restore oops from metadata. Oops are not shared.
475 virtual void remove_unshareable_info();
476 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
478 protected:
479 // computes the subtype relationship
480 virtual bool compute_is_subtype_of(Klass* k);
481 public:
482 // subclass accessor (here for convenience; undefined for non-klass objects)
483 virtual bool is_leaf_class() const { fatal("not a class"); return false; }
484 public:
485 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP
486 // These functions describe behavior for the oop not the KLASS.
488 // actual oop size of obj in memory
489 virtual int oop_size(oop obj) const = 0;
491 // Size of klass in word size.
492 virtual int size() const = 0;
493 #if INCLUDE_SERVICES
494 virtual void collect_statistics(KlassSizeStats *sz) const;
495 #endif
497 // Returns the Java name for a class (Resource allocated)
498 // For arrays, this returns the name of the element with a leading '['.
499 // For classes, this returns the name with the package separators
500 // turned into '.'s.
501 const char* external_name() const;
502 // Returns the name for a class (Resource allocated) as the class
503 // would appear in a signature.
504 // For arrays, this returns the name of the element with a leading '['.
505 // For classes, this returns the name with a leading 'L' and a trailing ';'
506 // and the package separators as '/'.
507 virtual const char* signature_name() const;
509 // garbage collection support
510 virtual void oop_follow_contents(oop obj) = 0;
511 virtual int oop_adjust_pointers(oop obj) = 0;
513 // Parallel Scavenge and Parallel Old
514 PARALLEL_GC_DECLS_PV
516 // type testing operations
517 protected:
518 virtual bool oop_is_instance_slow() const { return false; }
519 virtual bool oop_is_array_slow() const { return false; }
520 virtual bool oop_is_objArray_slow() const { return false; }
521 virtual bool oop_is_typeArray_slow() const { return false; }
522 public:
523 virtual bool oop_is_instanceClassLoader() const { return false; }
524 virtual bool oop_is_instanceMirror() const { return false; }
525 virtual bool oop_is_instanceRef() const { return false; }
527 // Fast non-virtual versions
528 #ifndef ASSERT
529 #define assert_same_query(xval, xcheck) xval
530 #else
531 private:
532 static bool assert_same_query(bool xval, bool xslow) {
533 assert(xval == xslow, "slow and fast queries agree");
534 return xval;
535 }
536 public:
537 #endif
538 inline bool oop_is_instance() const { return assert_same_query(
539 layout_helper_is_instance(layout_helper()),
540 oop_is_instance_slow()); }
541 inline bool oop_is_array() const { return assert_same_query(
542 layout_helper_is_array(layout_helper()),
543 oop_is_array_slow()); }
544 inline bool oop_is_objArray() const { return assert_same_query(
545 layout_helper_is_objArray(layout_helper()),
546 oop_is_objArray_slow()); }
547 inline bool oop_is_typeArray() const { return assert_same_query(
548 layout_helper_is_typeArray(layout_helper()),
549 oop_is_typeArray_slow()); }
550 #undef assert_same_query
552 // Access flags
553 AccessFlags access_flags() const { return _access_flags; }
554 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
556 bool is_public() const { return _access_flags.is_public(); }
557 bool is_final() const { return _access_flags.is_final(); }
558 bool is_interface() const { return _access_flags.is_interface(); }
559 bool is_abstract() const { return _access_flags.is_abstract(); }
560 bool is_super() const { return _access_flags.is_super(); }
561 bool is_synthetic() const { return _access_flags.is_synthetic(); }
562 void set_is_synthetic() { _access_flags.set_is_synthetic(); }
563 bool has_finalizer() const { return _access_flags.has_finalizer(); }
564 bool has_final_method() const { return _access_flags.has_final_method(); }
565 void set_has_finalizer() { _access_flags.set_has_finalizer(); }
566 void set_has_final_method() { _access_flags.set_has_final_method(); }
567 bool is_cloneable() const { return _access_flags.is_cloneable(); }
568 void set_is_cloneable() { _access_flags.set_is_cloneable(); }
569 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); }
570 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); }
571 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); }
572 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); }
574 // Biased locking support
575 // Note: the prototype header is always set up to be at least the
576 // prototype markOop. If biased locking is enabled it may further be
577 // biasable and have an epoch.
578 markOop prototype_header() const { return _prototype_header; }
579 // NOTE: once instances of this klass are floating around in the
580 // system, this header must only be updated at a safepoint.
581 // NOTE 2: currently we only ever set the prototype header to the
582 // biasable prototype for instanceKlasses. There is no technical
583 // reason why it could not be done for arrayKlasses aside from
584 // wanting to reduce the initial scope of this optimization. There
585 // are potential problems in setting the bias pattern for
586 // JVM-internal oops.
587 inline void set_prototype_header(markOop header);
588 static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); }
590 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; }
591 // Atomically increments biased_lock_revocation_count and returns updated value
592 int atomic_incr_biased_lock_revocation_count();
593 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; }
594 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; }
595 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; }
597 TRACE_DEFINE_KLASS_METHODS;
599 // garbage collection support
600 virtual void oops_do(OopClosure* cl);
602 // Iff the class loader (or mirror for anonymous classes) is alive the
603 // Klass is considered alive.
604 // The is_alive closure passed in depends on the Garbage Collector used.
605 bool is_loader_alive(BoolObjectClosure* is_alive);
607 static void clean_weak_klass_links(BoolObjectClosure* is_alive, bool clean_alive_klasses = true);
608 static void clean_subklass_tree(BoolObjectClosure* is_alive) {
609 clean_weak_klass_links(is_alive, false /* clean_alive_klasses */);
610 }
612 // iterators
613 virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0;
614 virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) {
615 return oop_oop_iterate(obj, blk);
616 }
618 #if INCLUDE_ALL_GCS
619 // In case we don't have a specialized backward scanner use forward
620 // iteration.
621 virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) {
622 return oop_oop_iterate_v(obj, blk);
623 }
624 #endif // INCLUDE_ALL_GCS
626 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr".
627 // (I don't see why the _m should be required, but without it the Solaris
628 // C++ gives warning messages about overridings of the "oop_oop_iterate"
629 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */
630 virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0;
631 virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
632 return oop_oop_iterate_m(obj, blk, mr);
633 }
635 // Versions of the above iterators specialized to particular subtypes
636 // of OopClosure, to avoid closure virtual calls.
637 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
638 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \
639 /* Default implementation reverts to general version. */ \
640 return oop_oop_iterate(obj, blk); \
641 } \
642 \
643 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \
644 (I don't see why the _m should be required, but without it the Solaris \
645 C++ gives warning messages about overridings of the "oop_oop_iterate" \
646 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \
647 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \
648 OopClosureType* blk, \
649 MemRegion mr) { \
650 return oop_oop_iterate_m(obj, blk, mr); \
651 }
653 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL)
654 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL)
656 #if INCLUDE_ALL_GCS
657 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
658 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \
659 OopClosureType* blk) { \
660 /* Default implementation reverts to general version. */ \
661 return oop_oop_iterate_backwards_v(obj, blk); \
662 }
664 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL)
665 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL)
666 #endif // INCLUDE_ALL_GCS
668 virtual void array_klasses_do(void f(Klass* k)) {}
670 // Return self, except for abstract classes with exactly 1
671 // implementor. Then return the 1 concrete implementation.
672 Klass *up_cast_abstract();
674 // klass name
675 Symbol* name() const { return _name; }
676 void set_name(Symbol* n);
678 public:
679 // jvm support
680 virtual jint compute_modifier_flags(TRAPS) const;
682 // JVMTI support
683 virtual jint jvmti_class_status() const;
685 // Printing
686 virtual void print_on(outputStream* st) const;
688 virtual void oop_print_value_on(oop obj, outputStream* st);
689 virtual void oop_print_on (oop obj, outputStream* st);
691 virtual const char* internal_name() const = 0;
693 // Verification
694 virtual void verify_on(outputStream* st);
695 void verify() { verify_on(tty); }
697 #ifndef PRODUCT
698 bool verify_vtable_index(int index);
699 bool verify_itable_index(int index);
700 #endif
702 virtual void oop_verify_on(oop obj, outputStream* st);
704 static bool is_null(narrowKlass obj);
705 static bool is_null(Klass* obj);
707 // klass encoding for klass pointer in objects.
708 static narrowKlass encode_klass_not_null(Klass* v);
709 static narrowKlass encode_klass(Klass* v);
711 static Klass* decode_klass_not_null(narrowKlass v);
712 static Klass* decode_klass(narrowKlass v);
714 private:
715 // barriers used by klass_oop_store
716 void klass_update_barrier_set(oop v);
717 void klass_update_barrier_set_pre(oop* p, oop v);
718 };
720 #endif // SHARE_VM_OOPS_KLASS_HPP