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annotate src/share/vm/oops/klass.hpp @ 3758:e2ce15aa3daf
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_KLASS_HPP |
26 #define SHARE_VM_OOPS_KLASS_HPP | |
27 | |
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/klassOop.hpp" | |
33 #include "oops/klassPS.hpp" | |
34 #include "oops/oop.hpp" | |
35 #include "runtime/orderAccess.hpp" | |
36 #include "utilities/accessFlags.hpp" | |
37 #ifndef SERIALGC | |
38 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp" | |
39 #include "gc_implementation/g1/g1OopClosures.hpp" | |
40 #include "gc_implementation/parNew/parOopClosures.hpp" | |
41 #endif | |
42 | |
0 | 43 // A Klass is the part of the klassOop that provides: |
44 // 1: language level class object (method dictionary etc.) | |
45 // 2: provide vm dispatch behavior for the object | |
46 // Both functions are combined into one C++ class. The toplevel class "Klass" | |
47 // implements purpose 1 whereas all subclasses provide extra virtual functions | |
48 // for purpose 2. | |
49 | |
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_"! | |
57 | |
58 // Klass layout: | |
59 // [header ] klassOop | |
60 // [klass pointer ] klassOop | |
61 // [C++ vtbl ptr ] (contained in Klass_vtbl) | |
62 // [layout_helper ] | |
63 // [super_check_offset ] for fast subtype checks | |
64 // [secondary_super_cache] for fast subtype checks | |
65 // [secondary_supers ] array of 2ndary supertypes | |
66 // [primary_supers 0] | |
67 // [primary_supers 1] | |
68 // [primary_supers 2] | |
69 // ... | |
70 // [primary_supers 7] | |
71 // [java_mirror ] | |
72 // [super ] | |
73 // [name ] | |
74 // [first subklass] | |
75 // [next_sibling ] link to chain additional subklasses | |
76 // [modifier_flags] | |
77 // [access_flags ] | |
78 // [verify_count ] - not in product | |
79 // [alloc_count ] | |
80 // [last_biased_lock_bulk_revocation_time] (64 bits) | |
81 // [prototype_header] | |
82 // [biased_lock_revocation_count] | |
83 | |
84 | |
85 // Forward declarations. | |
86 class klassVtable; | |
87 class KlassHandle; | |
88 class OrderAccess; | |
89 | |
90 // Holder (or cage) for the C++ vtable of each kind of Klass. | |
91 // We want to tightly constrain the location of the C++ vtable in the overall layout. | |
92 class Klass_vtbl { | |
93 protected: | |
94 // The following virtual exists only to force creation of a C++ vtable, | |
95 // so that this class truly is the location of the vtable of all Klasses. | |
96 virtual void unused_initial_virtual() { } | |
97 | |
98 public: | |
99 // The following virtual makes Klass_vtbl play a second role as a | |
100 // factory protocol for subclasses of Klass ("sub-Klasses"). | |
101 // Here's how it works.... | |
102 // | |
103 // This VM uses metaobjects as factories for their instances. | |
104 // | |
105 // In order to initialize the C++ vtable of a new instance, its | |
106 // metaobject is forced to use the C++ placed new operator to | |
107 // allocate the instance. In a typical C++-based system, each | |
108 // sub-class would have its own factory routine which | |
109 // directly uses the placed new operator on the desired class, | |
110 // and then calls the appropriate chain of C++ constructors. | |
111 // | |
112 // However, this system uses shared code to performs the first | |
113 // allocation and initialization steps for all sub-Klasses. | |
114 // (See base_create_klass() and base_create_array_klass().) | |
115 // This does not factor neatly into a hierarchy of C++ constructors. | |
116 // Each caller of these shared "base_create" routines knows | |
117 // exactly which sub-Klass it is creating, but the shared routine | |
118 // does not, even though it must perform the actual allocation. | |
119 // | |
120 // Therefore, the caller of the shared "base_create" must wrap | |
121 // the specific placed new call in a virtual function which | |
122 // performs the actual allocation and vtable set-up. That | |
123 // virtual function is here, Klass_vtbl::allocate_permanent. | |
124 // | |
125 // The arguments to Universe::allocate_permanent() are passed | |
126 // straight through the placed new operator, which in turn | |
127 // obtains them directly from this virtual call. | |
128 // | |
129 // This virtual is called on a temporary "example instance" of the | |
130 // sub-Klass being instantiated, a C++ auto variable. The "real" | |
131 // instance created by this virtual is on the VM heap, where it is | |
132 // equipped with a klassOopDesc header. | |
133 // | |
134 // It is merely an accident of implementation that we use "example | |
135 // instances", but that is why the virtual function which implements | |
136 // each sub-Klass factory happens to be defined by the same sub-Klass | |
137 // for which it creates instances. | |
138 // | |
139 // The vtbl_value() call (see below) is used to strip away the | |
140 // accidental Klass-ness from an "example instance" and present it as | |
141 // a factory. Think of each factory object as a mere container of the | |
142 // C++ vtable for the desired sub-Klass. Since C++ does not allow | |
143 // direct references to vtables, the factory must also be delegated | |
144 // the task of allocating the instance, but the essential point is | |
145 // that the factory knows how to initialize the C++ vtable with the | |
146 // right pointer value. All other common initializations are handled | |
147 // by the shared "base_create" subroutines. | |
148 // | |
149 virtual void* allocate_permanent(KlassHandle& klass, int size, TRAPS) const = 0; | |
150 void post_new_init_klass(KlassHandle& klass, klassOop obj, int size) const; | |
151 | |
152 // Every subclass on which vtbl_value is called must include this macro. | |
153 // Delay the installation of the klassKlass pointer until after the | |
154 // the vtable for a new klass has been installed (after the call to new()). | |
342
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155 #define DEFINE_ALLOCATE_PERMANENT(thisKlass) \ |
0 | 156 void* allocate_permanent(KlassHandle& klass_klass, int size, TRAPS) const { \ |
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157 void* result = new(klass_klass, size, THREAD) thisKlass(); \ |
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158 if (HAS_PENDING_EXCEPTION) return NULL; \ |
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159 klassOop new_klass = ((Klass*) result)->as_klassOop(); \ |
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160 OrderAccess::storestore(); \ |
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161 post_new_init_klass(klass_klass, new_klass, size); \ |
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162 return result; \ |
0 | 163 } |
164 | |
165 bool null_vtbl() { return *(intptr_t*)this == 0; } | |
166 | |
167 protected: | |
168 void* operator new(size_t ignored, KlassHandle& klass, int size, TRAPS); | |
169 }; | |
170 | |
171 | |
172 class Klass : public Klass_vtbl { | |
173 friend class VMStructs; | |
174 protected: | |
175 // note: put frequently-used fields together at start of klass structure | |
176 // for better cache behavior (may not make much of a difference but sure won't hurt) | |
177 enum { _primary_super_limit = 8 }; | |
178 | |
179 // The "layout helper" is a combined descriptor of object layout. | |
180 // For klasses which are neither instance nor array, the value is zero. | |
181 // | |
182 // For instances, layout helper is a positive number, the instance size. | |
183 // This size is already passed through align_object_size and scaled to bytes. | |
184 // The low order bit is set if instances of this class cannot be | |
185 // allocated using the fastpath. | |
186 // | |
187 // For arrays, layout helper is a negative number, containing four | |
188 // distinct bytes, as follows: | |
189 // MSB:[tag, hsz, ebt, log2(esz)]:LSB | |
190 // where: | |
191 // tag is 0x80 if the elements are oops, 0xC0 if non-oops | |
192 // hsz is array header size in bytes (i.e., offset of first element) | |
193 // ebt is the BasicType of the elements | |
194 // esz is the element size in bytes | |
195 // This packed word is arranged so as to be quickly unpacked by the | |
196 // various fast paths that use the various subfields. | |
197 // | |
198 // The esz bits can be used directly by a SLL instruction, without masking. | |
199 // | |
200 // Note that the array-kind tag looks like 0x00 for instance klasses, | |
201 // since their length in bytes is always less than 24Mb. | |
202 // | |
203 // Final note: This comes first, immediately after Klass_vtbl, | |
204 // because it is frequently queried. | |
205 jint _layout_helper; | |
206 | |
207 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers | |
208 // and _primary_supers all help make fast subtype checks. See big discussion | |
209 // in doc/server_compiler/checktype.txt | |
210 // | |
211 // Where to look to observe a supertype (it is &_secondary_super_cache for | |
212 // secondary supers, else is &_primary_supers[depth()]. | |
213 juint _super_check_offset; | |
214 | |
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215 // Class name. Instance classes: java/lang/String, etc. Array classes: [I, |
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216 // [Ljava/lang/String;, etc. Set to zero for all other kinds of classes. |
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217 Symbol* _name; |
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218 |
0 | 219 public: |
220 oop* oop_block_beg() const { return adr_secondary_super_cache(); } | |
221 oop* oop_block_end() const { return adr_next_sibling() + 1; } | |
222 | |
223 protected: | |
224 // | |
225 // The oop block. All oop fields must be declared here and only oop fields | |
226 // may be declared here. In addition, the first and last fields in this block | |
227 // must remain first and last, unless oop_block_beg() and/or oop_block_end() | |
228 // are updated. Grouping the oop fields in a single block simplifies oop | |
229 // iteration. | |
230 // | |
231 | |
232 // Cache of last observed secondary supertype | |
233 klassOop _secondary_super_cache; | |
234 // Array of all secondary supertypes | |
235 objArrayOop _secondary_supers; | |
236 // Ordered list of all primary supertypes | |
237 klassOop _primary_supers[_primary_super_limit]; | |
238 // java/lang/Class instance mirroring this class | |
239 oop _java_mirror; | |
240 // Superclass | |
241 klassOop _super; | |
242 // First subclass (NULL if none); _subklass->next_sibling() is next one | |
243 klassOop _subklass; | |
244 // Sibling link (or NULL); links all subklasses of a klass | |
245 klassOop _next_sibling; | |
246 | |
247 // | |
248 // End of the oop block. | |
249 // | |
250 | |
251 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers. | |
252 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here. | |
253 | |
254 #ifndef PRODUCT | |
255 int _verify_count; // to avoid redundant verifies | |
256 #endif | |
257 | |
258 juint _alloc_count; // allocation profiling support - update klass_size_in_bytes() if moved/deleted | |
259 | |
260 // Biased locking implementation and statistics | |
261 // (the 64-bit chunk goes first, to avoid some fragmentation) | |
262 jlong _last_biased_lock_bulk_revocation_time; | |
263 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type | |
264 jint _biased_lock_revocation_count; | |
265 | |
266 public: | |
267 | |
268 // returns the enclosing klassOop | |
269 klassOop as_klassOop() const { | |
270 // see klassOop.hpp for layout. | |
271 return (klassOop) (((char*) this) - sizeof(klassOopDesc)); | |
272 } | |
273 | |
274 public: | |
275 // Allocation | |
276 const Klass_vtbl& vtbl_value() const { return *this; } // used only on "example instances" | |
277 static KlassHandle base_create_klass(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS); | |
278 static klassOop base_create_klass_oop(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS); | |
279 | |
280 // super | |
281 klassOop super() const { return _super; } | |
282 void set_super(klassOop k) { oop_store_without_check((oop*) &_super, (oop) k); } | |
283 | |
284 // initializes _super link, _primary_supers & _secondary_supers arrays | |
285 void initialize_supers(klassOop k, TRAPS); | |
286 void initialize_supers_impl1(klassOop k); | |
287 void initialize_supers_impl2(klassOop k); | |
288 | |
289 // klass-specific helper for initializing _secondary_supers | |
290 virtual objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
291 | |
292 // java_super is the Java-level super type as specified by Class.getSuperClass. | |
293 virtual klassOop java_super() const { return NULL; } | |
294 | |
295 juint super_check_offset() const { return _super_check_offset; } | |
296 void set_super_check_offset(juint o) { _super_check_offset = o; } | |
297 | |
298 klassOop secondary_super_cache() const { return _secondary_super_cache; } | |
299 void set_secondary_super_cache(klassOop k) { oop_store_without_check((oop*) &_secondary_super_cache, (oop) k); } | |
300 | |
301 objArrayOop secondary_supers() const { return _secondary_supers; } | |
302 void set_secondary_supers(objArrayOop k) { oop_store_without_check((oop*) &_secondary_supers, (oop) k); } | |
303 | |
304 // Return the element of the _super chain of the given depth. | |
305 // If there is no such element, return either NULL or this. | |
306 klassOop primary_super_of_depth(juint i) const { | |
307 assert(i < primary_super_limit(), "oob"); | |
308 klassOop super = _primary_supers[i]; | |
309 assert(super == NULL || super->klass_part()->super_depth() == i, "correct display"); | |
310 return super; | |
311 } | |
312 | |
313 // Can this klass be a primary super? False for interfaces and arrays of | |
314 // interfaces. False also for arrays or classes with long super chains. | |
315 bool can_be_primary_super() const { | |
316 const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc); | |
317 return super_check_offset() != secondary_offset; | |
318 } | |
319 virtual bool can_be_primary_super_slow() const; | |
320 | |
321 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit]. | |
322 juint super_depth() const { | |
323 if (!can_be_primary_super()) { | |
324 return primary_super_limit(); | |
325 } else { | |
326 juint d = (super_check_offset() - (primary_supers_offset_in_bytes() + sizeof(oopDesc))) / sizeof(klassOop); | |
327 assert(d < primary_super_limit(), "oob"); | |
328 assert(_primary_supers[d] == as_klassOop(), "proper init"); | |
329 return d; | |
330 } | |
331 } | |
332 | |
333 // java mirror | |
334 oop java_mirror() const { return _java_mirror; } | |
335 void set_java_mirror(oop m) { oop_store((oop*) &_java_mirror, m); } | |
336 | |
337 // modifier flags | |
338 jint modifier_flags() const { return _modifier_flags; } | |
339 void set_modifier_flags(jint flags) { _modifier_flags = flags; } | |
340 | |
341 // size helper | |
342 int layout_helper() const { return _layout_helper; } | |
343 void set_layout_helper(int lh) { _layout_helper = lh; } | |
344 | |
345 // Note: for instances layout_helper() may include padding. | |
346 // Use instanceKlass::contains_field_offset to classify field offsets. | |
347 | |
348 // sub/superklass links | |
349 instanceKlass* superklass() const; | |
350 Klass* subklass() const; | |
351 Klass* next_sibling() const; | |
352 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list | |
353 void remove_from_sibling_list(); // remove receiver from sibling list | |
354 protected: // internal accessors | |
355 klassOop subklass_oop() const { return _subklass; } | |
356 klassOop next_sibling_oop() const { return _next_sibling; } | |
357 void set_subklass(klassOop s); | |
358 void set_next_sibling(klassOop s); | |
359 | |
360 oop* adr_super() const { return (oop*)&_super; } | |
361 oop* adr_primary_supers() const { return (oop*)&_primary_supers[0]; } | |
362 oop* adr_secondary_super_cache() const { return (oop*)&_secondary_super_cache; } | |
363 oop* adr_secondary_supers()const { return (oop*)&_secondary_supers; } | |
364 oop* adr_java_mirror() const { return (oop*)&_java_mirror; } | |
365 oop* adr_subklass() const { return (oop*)&_subklass; } | |
366 oop* adr_next_sibling() const { return (oop*)&_next_sibling; } | |
367 | |
368 public: | |
369 // Allocation profiling support | |
370 juint alloc_count() const { return _alloc_count; } | |
371 void set_alloc_count(juint n) { _alloc_count = n; } | |
372 virtual juint alloc_size() const = 0; | |
373 virtual void set_alloc_size(juint n) = 0; | |
374 | |
375 // Compiler support | |
376 static int super_offset_in_bytes() { return offset_of(Klass, _super); } | |
377 static int super_check_offset_offset_in_bytes() { return offset_of(Klass, _super_check_offset); } | |
378 static int primary_supers_offset_in_bytes(){ return offset_of(Klass, _primary_supers); } | |
379 static int secondary_super_cache_offset_in_bytes() { return offset_of(Klass, _secondary_super_cache); } | |
380 static int secondary_supers_offset_in_bytes() { return offset_of(Klass, _secondary_supers); } | |
381 static int java_mirror_offset_in_bytes() { return offset_of(Klass, _java_mirror); } | |
382 static int modifier_flags_offset_in_bytes(){ return offset_of(Klass, _modifier_flags); } | |
383 static int layout_helper_offset_in_bytes() { return offset_of(Klass, _layout_helper); } | |
384 static int access_flags_offset_in_bytes() { return offset_of(Klass, _access_flags); } | |
385 | |
386 // Unpacking layout_helper: | |
387 enum { | |
388 _lh_neutral_value = 0, // neutral non-array non-instance value | |
389 _lh_instance_slow_path_bit = 0x01, | |
390 _lh_log2_element_size_shift = BitsPerByte*0, | |
391 _lh_log2_element_size_mask = BitsPerLong-1, | |
392 _lh_element_type_shift = BitsPerByte*1, | |
393 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask | |
394 _lh_header_size_shift = BitsPerByte*2, | |
395 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask | |
396 _lh_array_tag_bits = 2, | |
397 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits, | |
398 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30 | |
399 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30 | |
400 }; | |
401 | |
402 static int layout_helper_size_in_bytes(jint lh) { | |
403 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
404 return (int) lh & ~_lh_instance_slow_path_bit; | |
405 } | |
406 static bool layout_helper_needs_slow_path(jint lh) { | |
407 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
408 return (lh & _lh_instance_slow_path_bit) != 0; | |
409 } | |
410 static bool layout_helper_is_instance(jint lh) { | |
411 return (jint)lh > (jint)_lh_neutral_value; | |
412 } | |
413 static bool layout_helper_is_javaArray(jint lh) { | |
414 return (jint)lh < (jint)_lh_neutral_value; | |
415 } | |
416 static bool layout_helper_is_typeArray(jint lh) { | |
417 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift); | |
418 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
419 } | |
420 static bool layout_helper_is_objArray(jint lh) { | |
421 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift); | |
422 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
423 } | |
424 static int layout_helper_header_size(jint lh) { | |
425 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
426 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask; | |
427 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity"); | |
428 return hsize; | |
429 } | |
430 static BasicType layout_helper_element_type(jint lh) { | |
431 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
432 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask; | |
433 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity"); | |
434 return (BasicType) btvalue; | |
435 } | |
436 static int layout_helper_log2_element_size(jint lh) { | |
437 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
438 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask; | |
439 assert(l2esz <= LogBitsPerLong, "sanity"); | |
440 return l2esz; | |
441 } | |
442 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) { | |
443 return (tag << _lh_array_tag_shift) | |
444 | (hsize << _lh_header_size_shift) | |
445 | ((int)etype << _lh_element_type_shift) | |
446 | (log2_esize << _lh_log2_element_size_shift); | |
447 } | |
448 static jint instance_layout_helper(jint size, bool slow_path_flag) { | |
449 return (size << LogHeapWordSize) | |
450 | (slow_path_flag ? _lh_instance_slow_path_bit : 0); | |
451 } | |
452 static int layout_helper_to_size_helper(jint lh) { | |
453 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
454 // Note that the following expression discards _lh_instance_slow_path_bit. | |
455 return lh >> LogHeapWordSize; | |
456 } | |
457 // Out-of-line version computes everything based on the etype: | |
458 static jint array_layout_helper(BasicType etype); | |
459 | |
460 // What is the maximum number of primary superclasses any klass can have? | |
461 #ifdef PRODUCT | |
462 static juint primary_super_limit() { return _primary_super_limit; } | |
463 #else | |
464 static juint primary_super_limit() { | |
465 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob"); | |
466 return FastSuperclassLimit; | |
467 } | |
468 #endif | |
469 | |
470 // vtables | |
471 virtual klassVtable* vtable() const { return NULL; } | |
472 | |
473 static int klass_size_in_bytes() { return offset_of(Klass, _alloc_count) + sizeof(juint); } // all "visible" fields | |
474 | |
475 // subclass check | |
476 bool is_subclass_of(klassOop k) const; | |
477 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it | |
478 bool is_subtype_of(klassOop k) const { | |
479 juint off = k->klass_part()->super_check_offset(); | |
480 klassOop sup = *(klassOop*)( (address)as_klassOop() + off ); | |
481 const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc); | |
482 if (sup == k) { | |
483 return true; | |
484 } else if (off != secondary_offset) { | |
485 return false; | |
486 } else { | |
487 return search_secondary_supers(k); | |
488 } | |
489 } | |
490 bool search_secondary_supers(klassOop k) const; | |
491 | |
605 | 492 // Find LCA in class hierarchy |
0 | 493 Klass *LCA( Klass *k ); |
494 | |
495 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
496 // if not, throw either an Error or an Exception. | |
497 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
498 | |
499 // Casting | |
500 static Klass* cast(klassOop k) { | |
501 assert(k->is_klass(), "cast to Klass"); | |
502 return k->klass_part(); | |
503 } | |
504 | |
505 // array copying | |
506 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); | |
507 | |
508 // tells if the class should be initialized | |
509 virtual bool should_be_initialized() const { return false; } | |
510 // initializes the klass | |
511 virtual void initialize(TRAPS); | |
512 // lookup operation for MethodLookupCache | |
513 friend class MethodLookupCache; | |
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514 virtual methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 515 public: |
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516 methodOop lookup_method(Symbol* name, Symbol* signature) const { |
0 | 517 return uncached_lookup_method(name, signature); |
518 } | |
519 | |
520 // array class with specific rank | |
521 klassOop array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); } | |
522 | |
523 // array class with this klass as element type | |
524 klassOop array_klass(TRAPS) { return array_klass_impl(false, THREAD); } | |
525 | |
526 // These will return NULL instead of allocating on the heap: | |
527 // NB: these can block for a mutex, like other functions with TRAPS arg. | |
528 klassOop array_klass_or_null(int rank); | |
529 klassOop array_klass_or_null(); | |
530 | |
531 virtual oop protection_domain() { return NULL; } | |
532 virtual oop class_loader() const { return NULL; } | |
533 | |
534 protected: | |
535 virtual klassOop array_klass_impl(bool or_null, int rank, TRAPS); | |
536 virtual klassOop array_klass_impl(bool or_null, TRAPS); | |
537 | |
538 public: | |
539 virtual void remove_unshareable_info(); | |
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540 virtual void shared_symbols_iterate(SymbolClosure* closure); |
0 | 541 |
542 protected: | |
543 // computes the subtype relationship | |
544 virtual bool compute_is_subtype_of(klassOop k); | |
545 public: | |
546 // subclass accessor (here for convenience; undefined for non-klass objects) | |
547 virtual bool is_leaf_class() const { fatal("not a class"); return false; } | |
548 public: | |
549 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP | |
550 // These functions describe behavior for the oop not the KLASS. | |
551 | |
552 // actual oop size of obj in memory | |
553 virtual int oop_size(oop obj) const = 0; | |
554 | |
555 // actual oop size of this klass in memory | |
556 virtual int klass_oop_size() const = 0; | |
557 | |
558 // Returns the Java name for a class (Resource allocated) | |
559 // For arrays, this returns the name of the element with a leading '['. | |
560 // For classes, this returns the name with the package separators | |
561 // turned into '.'s. | |
562 const char* external_name() const; | |
563 // Returns the name for a class (Resource allocated) as the class | |
564 // would appear in a signature. | |
565 // For arrays, this returns the name of the element with a leading '['. | |
566 // For classes, this returns the name with a leading 'L' and a trailing ';' | |
567 // and the package separators as '/'. | |
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568 virtual const char* signature_name() const; |
0 | 569 |
570 // garbage collection support | |
571 virtual void oop_follow_contents(oop obj) = 0; | |
572 virtual int oop_adjust_pointers(oop obj) = 0; | |
573 | |
574 // Parallel Scavenge and Parallel Old | |
575 PARALLEL_GC_DECLS_PV | |
576 | |
577 public: | |
578 // type testing operations | |
579 virtual bool oop_is_instance_slow() const { return false; } | |
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580 virtual bool oop_is_instanceMirror() const { return false; } |
0 | 581 virtual bool oop_is_instanceRef() const { return false; } |
582 virtual bool oop_is_array() const { return false; } | |
583 virtual bool oop_is_objArray_slow() const { return false; } | |
584 virtual bool oop_is_klass() const { return false; } | |
585 virtual bool oop_is_thread() const { return false; } | |
586 virtual bool oop_is_method() const { return false; } | |
587 virtual bool oop_is_constMethod() const { return false; } | |
588 virtual bool oop_is_methodData() const { return false; } | |
589 virtual bool oop_is_constantPool() const { return false; } | |
590 virtual bool oop_is_constantPoolCache() const { return false; } | |
591 virtual bool oop_is_typeArray_slow() const { return false; } | |
592 virtual bool oop_is_arrayKlass() const { return false; } | |
593 virtual bool oop_is_objArrayKlass() const { return false; } | |
594 virtual bool oop_is_typeArrayKlass() const { return false; } | |
595 virtual bool oop_is_compiledICHolder() const { return false; } | |
596 virtual bool oop_is_instanceKlass() const { return false; } | |
597 | |
598 bool oop_is_javaArray_slow() const { | |
599 return oop_is_objArray_slow() || oop_is_typeArray_slow(); | |
600 } | |
601 | |
602 // Fast non-virtual versions, used by oop.inline.hpp and elsewhere: | |
603 #ifndef ASSERT | |
604 #define assert_same_query(xval, xcheck) xval | |
605 #else | |
606 private: | |
607 static bool assert_same_query(bool xval, bool xslow) { | |
608 assert(xval == xslow, "slow and fast queries agree"); | |
609 return xval; | |
610 } | |
611 public: | |
612 #endif | |
613 inline bool oop_is_instance() const { return assert_same_query( | |
614 layout_helper_is_instance(layout_helper()), | |
615 oop_is_instance_slow()); } | |
616 inline bool oop_is_javaArray() const { return assert_same_query( | |
617 layout_helper_is_javaArray(layout_helper()), | |
618 oop_is_javaArray_slow()); } | |
619 inline bool oop_is_objArray() const { return assert_same_query( | |
620 layout_helper_is_objArray(layout_helper()), | |
621 oop_is_objArray_slow()); } | |
622 inline bool oop_is_typeArray() const { return assert_same_query( | |
623 layout_helper_is_typeArray(layout_helper()), | |
624 oop_is_typeArray_slow()); } | |
625 #undef assert_same_query | |
626 | |
627 // Unless overridden, oop is parsable if it has a klass pointer. | |
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628 // Parsability of an object is object specific. |
0 | 629 virtual bool oop_is_parsable(oop obj) const { return true; } |
630 | |
518
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631 // Unless overridden, oop is safe for concurrent GC processing |
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632 // after its allocation is complete. The exception to |
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633 // this is the case where objects are changed after allocation. |
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634 // Class redefinition is one of the known exceptions. During |
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635 // class redefinition, an allocated class can changed in order |
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636 // order to create a merged class (the combiniation of the |
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637 // old class definition that has to be perserved and the new class |
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638 // definition which is being created. |
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639 virtual bool oop_is_conc_safe(oop obj) const { return true; } |
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640 |
0 | 641 // Access flags |
642 AccessFlags access_flags() const { return _access_flags; } | |
643 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
644 | |
645 bool is_public() const { return _access_flags.is_public(); } | |
646 bool is_final() const { return _access_flags.is_final(); } | |
647 bool is_interface() const { return _access_flags.is_interface(); } | |
648 bool is_abstract() const { return _access_flags.is_abstract(); } | |
649 bool is_super() const { return _access_flags.is_super(); } | |
650 bool is_synthetic() const { return _access_flags.is_synthetic(); } | |
651 void set_is_synthetic() { _access_flags.set_is_synthetic(); } | |
652 bool has_finalizer() const { return _access_flags.has_finalizer(); } | |
653 bool has_final_method() const { return _access_flags.has_final_method(); } | |
654 void set_has_finalizer() { _access_flags.set_has_finalizer(); } | |
655 void set_has_final_method() { _access_flags.set_has_final_method(); } | |
656 bool is_cloneable() const { return _access_flags.is_cloneable(); } | |
657 void set_is_cloneable() { _access_flags.set_is_cloneable(); } | |
658 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); } | |
659 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); } | |
660 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); } | |
661 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); } | |
662 | |
663 // Biased locking support | |
664 // Note: the prototype header is always set up to be at least the | |
665 // prototype markOop. If biased locking is enabled it may further be | |
666 // biasable and have an epoch. | |
667 markOop prototype_header() const { return _prototype_header; } | |
668 // NOTE: once instances of this klass are floating around in the | |
669 // system, this header must only be updated at a safepoint. | |
670 // NOTE 2: currently we only ever set the prototype header to the | |
671 // biasable prototype for instanceKlasses. There is no technical | |
672 // reason why it could not be done for arrayKlasses aside from | |
673 // wanting to reduce the initial scope of this optimization. There | |
674 // are potential problems in setting the bias pattern for | |
675 // JVM-internal oops. | |
676 inline void set_prototype_header(markOop header); | |
677 static int prototype_header_offset_in_bytes() { return offset_of(Klass, _prototype_header); } | |
678 | |
679 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; } | |
680 // Atomically increments biased_lock_revocation_count and returns updated value | |
681 int atomic_incr_biased_lock_revocation_count(); | |
682 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; } | |
683 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; } | |
684 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; } | |
685 | |
686 | |
687 // garbage collection support | |
688 virtual void follow_weak_klass_links( | |
689 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
690 | |
691 // Prefetch within oop iterators. This is a macro because we | |
692 // can't guarantee that the compiler will inline it. In 64-bit | |
693 // it generally doesn't. Signature is | |
694 // | |
695 // static void prefetch_beyond(oop* const start, | |
696 // oop* const end, | |
697 // const intx foffset, | |
698 // const Prefetch::style pstyle); | |
699 #define prefetch_beyond(start, end, foffset, pstyle) { \ | |
700 const intx foffset_ = (foffset); \ | |
701 const Prefetch::style pstyle_ = (pstyle); \ | |
702 assert(foffset_ > 0, "prefetch beyond, not behind"); \ | |
703 if (pstyle_ != Prefetch::do_none) { \ | |
704 oop* ref = (start); \ | |
705 if (ref < (end)) { \ | |
706 switch (pstyle_) { \ | |
707 case Prefetch::do_read: \ | |
708 Prefetch::read(*ref, foffset_); \ | |
709 break; \ | |
710 case Prefetch::do_write: \ | |
711 Prefetch::write(*ref, foffset_); \ | |
712 break; \ | |
713 default: \ | |
714 ShouldNotReachHere(); \ | |
715 break; \ | |
716 } \ | |
717 } \ | |
718 } \ | |
719 } | |
720 | |
721 // iterators | |
722 virtual int oop_oop_iterate(oop obj, OopClosure* blk) = 0; | |
723 virtual int oop_oop_iterate_v(oop obj, OopClosure* blk) { | |
724 return oop_oop_iterate(obj, blk); | |
725 } | |
726 | |
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727 #ifndef SERIALGC |
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728 // In case we don't have a specialized backward scanner use forward |
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729 // iteration. |
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730 virtual int oop_oop_iterate_backwards_v(oop obj, OopClosure* blk) { |
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731 return oop_oop_iterate_v(obj, blk); |
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732 } |
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733 #endif // !SERIALGC |
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734 |
0 | 735 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr". |
736 // (I don't see why the _m should be required, but without it the Solaris | |
737 // C++ gives warning messages about overridings of the "oop_oop_iterate" | |
738 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */ | |
739 virtual int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) = 0; | |
740 virtual int oop_oop_iterate_v_m(oop obj, OopClosure* blk, MemRegion mr) { | |
741 return oop_oop_iterate_m(obj, blk, mr); | |
742 } | |
743 | |
744 // Versions of the above iterators specialized to particular subtypes | |
745 // of OopClosure, to avoid closure virtual calls. | |
746 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
747 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \ | |
748 /* Default implementation reverts to general version. */ \ | |
749 return oop_oop_iterate(obj, blk); \ | |
750 } \ | |
751 \ | |
752 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \ | |
753 (I don't see why the _m should be required, but without it the Solaris \ | |
754 C++ gives warning messages about overridings of the "oop_oop_iterate" \ | |
755 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \ | |
756 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \ | |
757 OopClosureType* blk, \ | |
758 MemRegion mr) { \ | |
759 return oop_oop_iterate_m(obj, blk, mr); \ | |
760 } | |
761 | |
762 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL) | |
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763 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL) |
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764 |
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765 #ifndef SERIALGC |
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766 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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767 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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768 OopClosureType* blk) { \ |
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769 /* Default implementation reverts to general version. */ \ |
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770 return oop_oop_iterate_backwards_v(obj, blk); \ |
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771 } |
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772 |
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773 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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774 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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775 #endif // !SERIALGC |
0 | 776 |
777 virtual void array_klasses_do(void f(klassOop k)) {} | |
778 virtual void with_array_klasses_do(void f(klassOop k)); | |
779 | |
780 // Return self, except for abstract classes with exactly 1 | |
781 // implementor. Then return the 1 concrete implementation. | |
782 Klass *up_cast_abstract(); | |
783 | |
784 // klass name | |
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785 Symbol* name() const { return _name; } |
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786 void set_name(Symbol* n); |
0 | 787 |
788 friend class klassKlass; | |
789 | |
790 public: | |
791 // jvm support | |
792 virtual jint compute_modifier_flags(TRAPS) const; | |
793 | |
794 // JVMTI support | |
795 virtual jint jvmti_class_status() const; | |
796 | |
797 // Printing | |
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798 virtual void oop_print_value_on(oop obj, outputStream* st); |
0 | 799 virtual void oop_print_on (oop obj, outputStream* st); |
800 | |
801 // Verification | |
802 virtual const char* internal_name() const = 0; | |
803 virtual void oop_verify_on(oop obj, outputStream* st); | |
804 virtual void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty); | |
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805 virtual void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty); |
0 | 806 // tells whether obj is partially constructed (gc during class loading) |
807 virtual bool oop_partially_loaded(oop obj) const { return false; } | |
808 virtual void oop_set_partially_loaded(oop obj) {}; | |
809 | |
810 #ifndef PRODUCT | |
811 void verify_vtable_index(int index); | |
812 #endif | |
813 }; | |
1972 | 814 |
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815 |
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816 inline oop klassOopDesc::java_mirror() const { return klass_part()->java_mirror(); } |
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817 |
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818 |
1972 | 819 #endif // SHARE_VM_OOPS_KLASS_HPP |