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annotate src/share/vm/oops/instanceKlass.hpp @ 4771:22cee0ee8927
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date | Fri, 06 Jan 2012 20:09:20 -0800 |
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0 | 1 /* |
2227 | 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_INSTANCEKLASS_HPP |
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP | |
27 | |
28 #include "oops/constMethodOop.hpp" | |
29 #include "oops/constantPoolOop.hpp" | |
3938 | 30 #include "oops/fieldInfo.hpp" |
1972 | 31 #include "oops/instanceOop.hpp" |
32 #include "oops/klassOop.hpp" | |
33 #include "oops/klassVtable.hpp" | |
34 #include "oops/objArrayOop.hpp" | |
35 #include "runtime/handles.hpp" | |
36 #include "runtime/os.hpp" | |
37 #include "utilities/accessFlags.hpp" | |
38 #include "utilities/bitMap.inline.hpp" | |
39 | |
0 | 40 // An instanceKlass is the VM level representation of a Java class. |
41 // It contains all information needed for at class at execution runtime. | |
42 | |
43 // instanceKlass layout: | |
44 // [header ] klassOop | |
45 // [klass pointer ] klassOop | |
46 // [C++ vtbl pointer ] Klass | |
47 // [subtype cache ] Klass | |
48 // [instance size ] Klass | |
49 // [java mirror ] Klass | |
50 // [super ] Klass | |
51 // [access_flags ] Klass | |
52 // [name ] Klass | |
53 // [first subklass ] Klass | |
54 // [next sibling ] Klass | |
55 // [array klasses ] | |
56 // [methods ] | |
57 // [local interfaces ] | |
58 // [transitive interfaces ] | |
59 // [number of implementors ] | |
60 // [implementors ] klassOop[2] | |
61 // [fields ] | |
62 // [constants ] | |
63 // [class loader ] | |
64 // [protection domain ] | |
65 // [signers ] | |
66 // [source file name ] | |
67 // [inner classes ] | |
68 // [static field size ] | |
69 // [nonstatic field size ] | |
70 // [static oop fields size ] | |
71 // [nonstatic oop maps size ] | |
72 // [has finalize method ] | |
73 // [deoptimization mark bit ] | |
74 // [initialization state ] | |
75 // [initializing thread ] | |
76 // [Java vtable length ] | |
77 // [oop map cache (stack maps) ] | |
78 // [EMBEDDED Java vtable ] size in words = vtable_len | |
79 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
80 // | |
81 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating | |
82 // where oops are located in instances of this klass. | |
83 | |
84 | |
85 // forward declaration for class -- see below for definition | |
86 class SuperTypeClosure; | |
87 class JNIid; | |
88 class jniIdMapBase; | |
89 class BreakpointInfo; | |
90 class fieldDescriptor; | |
91 class DepChange; | |
92 class nmethodBucket; | |
93 class PreviousVersionNode; | |
94 class JvmtiCachedClassFieldMap; | |
95 | |
96 // This is used in iterators below. | |
97 class FieldClosure: public StackObj { | |
98 public: | |
99 virtual void do_field(fieldDescriptor* fd) = 0; | |
100 }; | |
101 | |
102 #ifndef PRODUCT | |
103 // Print fields. | |
104 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
105 class FieldPrinter: public FieldClosure { | |
106 oop _obj; | |
107 outputStream* _st; | |
108 public: | |
109 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
110 void do_field(fieldDescriptor* fd); | |
111 }; | |
112 #endif // !PRODUCT | |
113 | |
938 | 114 // ValueObjs embedded in klass. Describes where oops are located in instances of |
115 // this klass. | |
116 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
117 public: | |
118 // Byte offset of the first oop mapped by this block. | |
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119 int offset() const { return _offset; } |
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120 void set_offset(int offset) { _offset = offset; } |
938 | 121 |
122 // Number of oops in this block. | |
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123 uint count() const { return _count; } |
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124 void set_count(uint count) { _count = count; } |
938 | 125 |
126 // sizeof(OopMapBlock) in HeapWords. | |
127 static const int size_in_words() { | |
128 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> | |
129 LogHeapWordSize; | |
130 } | |
131 | |
132 private: | |
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133 int _offset; |
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134 uint _count; |
938 | 135 }; |
136 | |
0 | 137 class instanceKlass: public Klass { |
138 friend class VMStructs; | |
139 public: | |
140 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
141 // of the class loading & initialization procedure, and the use of the states. | |
142 enum ClassState { | |
143 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
144 allocated, // allocated (but not yet linked) | |
145 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
146 linked, // successfully linked/verified (but not initialized yet) | |
147 being_initialized, // currently running class initializer | |
148 fully_initialized, // initialized (successfull final state) | |
149 initialization_error // error happened during initialization | |
150 }; | |
151 | |
152 public: | |
153 oop* oop_block_beg() const { return adr_array_klasses(); } | |
154 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
155 | |
156 enum { | |
157 implementors_limit = 2 // how many implems can we track? | |
158 }; | |
159 | |
160 protected: | |
161 // | |
162 // The oop block. See comment in klass.hpp before making changes. | |
163 // | |
164 | |
165 // Array classes holding elements of this class. | |
166 klassOop _array_klasses; | |
167 // Method array. | |
168 objArrayOop _methods; | |
169 // Int array containing the original order of method in the class file (for | |
170 // JVMTI). | |
171 typeArrayOop _method_ordering; | |
172 // Interface (klassOops) this class declares locally to implement. | |
173 objArrayOop _local_interfaces; | |
174 // Interface (klassOops) this class implements transitively. | |
175 objArrayOop _transitive_interfaces; | |
176 // Instance and static variable information, 5-tuples of shorts [access, name | |
177 // index, sig index, initval index, offset]. | |
178 typeArrayOop _fields; | |
179 // Constant pool for this class. | |
180 constantPoolOop _constants; | |
181 // Class loader used to load this class, NULL if VM loader used. | |
182 oop _class_loader; | |
183 // Protection domain. | |
184 oop _protection_domain; | |
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185 // Host class, which grants its access privileges to this class also. |
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186 // This is only non-null for an anonymous class (JSR 292 enabled). |
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187 // The host class is either named, or a previously loaded anonymous class. |
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188 klassOop _host_klass; |
0 | 189 // Class signers. |
190 objArrayOop _signers; | |
191 // inner_classes attribute. | |
192 typeArrayOop _inner_classes; | |
193 // Implementors of this interface (not valid if it overflows) | |
194 klassOop _implementors[implementors_limit]; | |
195 // Annotations for this class, or null if none. | |
196 typeArrayOop _class_annotations; | |
197 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
198 // Indices correspond to entries (not indices) in fields array. | |
199 objArrayOop _fields_annotations; | |
200 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
201 // Index is the idnum, which is initially the same as the methods array index. | |
202 objArrayOop _methods_annotations; | |
203 // Annotation objects (byte arrays) for methods' parameters, or null if no | |
204 // such annotations. | |
205 // Index is the idnum, which is initially the same as the methods array index. | |
206 objArrayOop _methods_parameter_annotations; | |
207 // Annotation objects (byte arrays) for methods' default values, or null if no | |
208 // such annotations. | |
209 // Index is the idnum, which is initially the same as the methods array index. | |
210 objArrayOop _methods_default_annotations; | |
211 | |
212 // | |
213 // End of the oop block. | |
214 // | |
215 | |
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216 // Name of source file containing this klass, NULL if not specified. |
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217 Symbol* _source_file_name; |
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218 // the source debug extension for this klass, NULL if not specified. |
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219 Symbol* _source_debug_extension; |
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220 // Generic signature, or null if none. |
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221 Symbol* _generic_signature; |
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222 // Array name derived from this class which needs unreferencing |
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223 // if this class is unloaded. |
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224 Symbol* _array_name; |
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225 |
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226 // Number of heapOopSize words used by non-static fields in this klass |
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227 // (including inherited fields but after header_size()). |
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228 int _nonstatic_field_size; |
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229 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
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230 u2 _static_oop_field_count;// number of static oop fields in this klass |
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231 u2 _java_fields_count; // The number of declared Java fields |
938 | 232 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks |
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233 |
0 | 234 u2 _minor_version; // minor version number of class file |
235 u2 _major_version; // major version number of class file | |
236 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
237 int _vtable_len; // length of Java vtable (in words) | |
238 int _itable_len; // length of Java itable (in words) | |
239 ReferenceType _reference_type; // reference type | |
240 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
241 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
242 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
243 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
244 nmethodBucket* _dependencies; // list of dependent nmethods | |
245 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
246 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
247 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
248 // Array of interesting part(s) of the previous version(s) of this | |
249 // instanceKlass. See PreviousVersionWalker below. | |
250 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
251 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
252 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
253 // JVMTI fields can be moved to their own structure - see 6315920 | |
254 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
255 jint _cached_class_file_len; // JVMTI: length of above | |
256 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
257 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
258 | |
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259 // Class states are defined as ClassState (see above). |
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260 // Place the _init_state here to utilize the unused 2-byte after |
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261 // _idnum_allocated_count. |
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262 u1 _init_state; // state of class |
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263 |
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264 // Compact the following four boolean flags into 1-bit each. These four flags |
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265 // were defined as separate boolean fields and each was 1-byte before. Since |
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266 // there are 2 bytes unused after the _idnum_allocated_count field, place the |
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267 // _misc_flags field after _idnum_allocated_count to utilize the unused bits |
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268 // and save total 4-bytes. |
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269 enum { |
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270 IS_MARKED_DEPENDENT = 0x1, // used for marking during flushing and deoptimization |
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271 REWRITTEN = 0x2, // methods rewritten. |
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272 HAS_NONSTATIC_FIELDS = 0x4, // for sizing with UseCompressedOops |
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273 SHOULD_VERIFY_CLASS = 0x8 // allow caching of preverification |
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274 }; |
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275 u1 _misc_flags; |
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276 |
0 | 277 // embedded Java vtable follows here |
278 // embedded Java itables follows here | |
279 // embedded static fields follows here | |
280 // embedded nonstatic oop-map blocks follows here | |
281 | |
282 friend class instanceKlassKlass; | |
283 friend class SystemDictionary; | |
284 | |
285 public: | |
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286 bool has_nonstatic_fields() const { return (_misc_flags & HAS_NONSTATIC_FIELDS) != 0; } |
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287 void set_has_nonstatic_fields(bool b) { |
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288 if (b) { |
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289 _misc_flags |= HAS_NONSTATIC_FIELDS; |
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290 } else { |
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291 _misc_flags &= ~HAS_NONSTATIC_FIELDS; |
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292 } |
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293 } |
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294 |
0 | 295 // field sizes |
296 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
297 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
298 | |
299 int static_field_size() const { return _static_field_size; } | |
300 void set_static_field_size(int size) { _static_field_size = size; } | |
301 | |
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302 int static_oop_field_count() const { return (int)_static_oop_field_count; } |
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303 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } |
0 | 304 |
305 // Java vtable | |
306 int vtable_length() const { return _vtable_len; } | |
307 void set_vtable_length(int len) { _vtable_len = len; } | |
308 | |
309 // Java itable | |
310 int itable_length() const { return _itable_len; } | |
311 void set_itable_length(int len) { _itable_len = len; } | |
312 | |
313 // array klasses | |
314 klassOop array_klasses() const { return _array_klasses; } | |
315 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
316 | |
317 // methods | |
318 objArrayOop methods() const { return _methods; } | |
319 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
320 methodOop method_with_idnum(int idnum); | |
321 | |
322 // method ordering | |
323 typeArrayOop method_ordering() const { return _method_ordering; } | |
324 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
325 | |
326 // interfaces | |
327 objArrayOop local_interfaces() const { return _local_interfaces; } | |
328 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
329 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
330 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
331 | |
3938 | 332 private: |
333 friend class fieldDescriptor; | |
334 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } | |
335 | |
336 public: | |
337 int field_offset (int index) const { return field(index)->offset(); } | |
338 int field_access_flags(int index) const { return field(index)->access_flags(); } | |
339 Symbol* field_name (int index) const { return field(index)->name(constants()); } | |
340 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } | |
341 | |
342 // Number of Java declared fields | |
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343 int java_fields_count() const { return (int)_java_fields_count; } |
3938 | 344 |
345 // Number of fields including any injected fields | |
346 int all_fields_count() const { return _fields->length() / sizeof(FieldInfo::field_slots); } | |
0 | 347 |
348 typeArrayOop fields() const { return _fields; } | |
3938 | 349 |
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350 void set_fields(typeArrayOop f, u2 java_fields_count) { |
3938 | 351 oop_store_without_check((oop*) &_fields, (oop) f); |
352 _java_fields_count = java_fields_count; | |
0 | 353 } |
354 | |
355 // inner classes | |
356 typeArrayOop inner_classes() const { return _inner_classes; } | |
357 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
358 | |
359 enum InnerClassAttributeOffset { | |
360 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
361 inner_class_inner_class_info_offset = 0, | |
362 inner_class_outer_class_info_offset = 1, | |
363 inner_class_inner_name_offset = 2, | |
364 inner_class_access_flags_offset = 3, | |
365 inner_class_next_offset = 4 | |
366 }; | |
367 | |
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368 // method override check |
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369 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); |
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370 |
0 | 371 // package |
372 bool is_same_class_package(klassOop class2); | |
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373 bool is_same_class_package(oop classloader2, Symbol* classname2); |
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374 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); |
0 | 375 |
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376 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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377 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { |
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378 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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379 return compute_enclosing_class_impl(self, inner_is_member, THREAD); |
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380 } |
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381 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
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382 bool* inner_is_member, TRAPS); |
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383 |
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384 // tell if two classes have the same enclosing class (at package level) |
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385 bool is_same_package_member(klassOop class2, TRAPS) { |
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386 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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387 return is_same_package_member_impl(self, class2, THREAD); |
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388 } |
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389 static bool is_same_package_member_impl(instanceKlassHandle self, |
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390 klassOop class2, TRAPS); |
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391 |
0 | 392 // initialization state |
393 bool is_loaded() const { return _init_state >= loaded; } | |
394 bool is_linked() const { return _init_state >= linked; } | |
395 bool is_initialized() const { return _init_state == fully_initialized; } | |
396 bool is_not_initialized() const { return _init_state < being_initialized; } | |
397 bool is_being_initialized() const { return _init_state == being_initialized; } | |
398 bool is_in_error_state() const { return _init_state == initialization_error; } | |
399 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
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400 ClassState init_state() { return (ClassState)_init_state; } |
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401 bool is_rewritten() const { return (_misc_flags & REWRITTEN) != 0; } |
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402 |
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403 // defineClass specified verification |
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404 bool should_verify_class() const { return (_misc_flags & SHOULD_VERIFY_CLASS) != 0; } |
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405 void set_should_verify_class(bool value) { |
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406 if (value) { |
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407 _misc_flags |= SHOULD_VERIFY_CLASS; |
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408 } else { |
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409 _misc_flags &= ~SHOULD_VERIFY_CLASS; |
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410 } |
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411 } |
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412 |
0 | 413 |
414 // marking | |
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415 bool is_marked_dependent() const { return (_misc_flags & IS_MARKED_DEPENDENT) != 0; } |
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416 void set_is_marked_dependent() { _misc_flags |= IS_MARKED_DEPENDENT; } |
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417 void clear_is_marked_dependent() { _misc_flags &= ~IS_MARKED_DEPENDENT; } |
0 | 418 |
419 // initialization (virtuals from Klass) | |
420 bool should_be_initialized() const; // means that initialize should be called | |
421 void initialize(TRAPS); | |
422 void link_class(TRAPS); | |
423 bool link_class_or_fail(TRAPS); // returns false on failure | |
424 void unlink_class(); | |
425 void rewrite_class(TRAPS); | |
3748 | 426 void relocate_and_link_methods(TRAPS); |
0 | 427 methodOop class_initializer(); |
428 | |
429 // set the class to initialized if no static initializer is present | |
430 void eager_initialize(Thread *thread); | |
431 | |
432 // reference type | |
433 ReferenceType reference_type() const { return _reference_type; } | |
434 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
435 | |
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436 static ByteSize reference_type_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _reference_type)); } |
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437 |
0 | 438 // find local field, returns true if found |
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439 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 440 // find field in direct superinterfaces, returns the interface in which the field is defined |
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441 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 442 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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443 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
0 | 444 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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445 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; |
0 | 446 |
447 // find a non-static or static field given its offset within the class. | |
448 bool contains_field_offset(int offset) { | |
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449 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
0 | 450 } |
451 | |
452 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
453 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
454 | |
455 // find a local method (returns NULL if not found) | |
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456 methodOop find_method(Symbol* name, Symbol* signature) const; |
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457 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); |
0 | 458 |
459 // lookup operation (returns NULL if not found) | |
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460 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; |
0 | 461 |
462 // lookup a method in all the interfaces that this class implements | |
463 // (returns NULL if not found) | |
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464 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; |
0 | 465 |
466 // constant pool | |
467 constantPoolOop constants() const { return _constants; } | |
468 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
469 | |
470 // class loader | |
471 oop class_loader() const { return _class_loader; } | |
472 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
473 | |
474 // protection domain | |
475 oop protection_domain() { return _protection_domain; } | |
476 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
477 | |
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478 // host class |
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479 oop host_klass() const { return _host_klass; } |
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480 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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481 bool is_anonymous() const { return _host_klass != NULL; } |
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482 |
0 | 483 // signers |
484 objArrayOop signers() const { return _signers; } | |
485 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
486 | |
487 // source file name | |
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488 Symbol* source_file_name() const { return _source_file_name; } |
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489 void set_source_file_name(Symbol* n); |
0 | 490 |
491 // minor and major version numbers of class file | |
492 u2 minor_version() const { return _minor_version; } | |
493 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
494 u2 major_version() const { return _major_version; } | |
495 void set_major_version(u2 major_version) { _major_version = major_version; } | |
496 | |
497 // source debug extension | |
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498 Symbol* source_debug_extension() const { return _source_debug_extension; } |
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499 void set_source_debug_extension(Symbol* n); |
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500 |
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501 // symbol unloading support (refcount already added) |
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502 Symbol* array_name() { return _array_name; } |
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503 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } |
0 | 504 |
505 // nonstatic oop-map blocks | |
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506 static int nonstatic_oop_map_size(unsigned int oop_map_count) { |
938 | 507 return oop_map_count * OopMapBlock::size_in_words(); |
508 } | |
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509 unsigned int nonstatic_oop_map_count() const { |
938 | 510 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); |
511 } | |
512 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
513 void set_nonstatic_oop_map_size(int words) { | |
514 _nonstatic_oop_map_size = words; | |
515 } | |
0 | 516 |
517 // RedefineClasses() support for previous versions: | |
518 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
519 int emcp_method_count); | |
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520 // If the _previous_versions array is non-NULL, then this klass |
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521 // has been redefined at least once even if we aren't currently |
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522 // tracking a previous version. |
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523 bool has_been_redefined() const { return _previous_versions != NULL; } |
0 | 524 bool has_previous_version() const; |
525 void init_previous_versions() { | |
526 _previous_versions = NULL; | |
527 } | |
528 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
529 return _previous_versions; | |
530 } | |
531 | |
532 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
533 void set_cached_class_file(unsigned char *class_file_bytes, | |
534 jint class_file_len) { _cached_class_file_len = class_file_len; | |
535 _cached_class_file_bytes = class_file_bytes; } | |
536 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
537 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
538 | |
539 // JVMTI: Support for caching of field indices, types, and offsets | |
540 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
541 _jvmti_cached_class_field_map = descriptor; | |
542 } | |
543 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
544 return _jvmti_cached_class_field_map; | |
545 } | |
546 | |
547 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
548 inline u2 next_method_idnum(); | |
549 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
550 | |
551 // generics support | |
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552 Symbol* generic_signature() const { return _generic_signature; } |
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553 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } |
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554 |
0 | 555 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } |
556 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
557 void set_enclosing_method_indices(u2 class_index, | |
558 u2 method_index) { _enclosing_method_class_index = class_index; | |
559 _enclosing_method_method_index = method_index; } | |
560 | |
561 // jmethodID support | |
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562 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, |
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563 methodHandle method_h); |
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564 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, |
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565 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, |
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566 jmethodID* to_dealloc_id_p, |
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567 jmethodID** to_dealloc_jmeths_p); |
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568 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, |
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569 size_t *length_p, jmethodID* id_p); |
0 | 570 jmethodID jmethod_id_or_null(methodOop method); |
571 | |
572 // cached itable index support | |
573 void set_cached_itable_index(size_t idnum, int index); | |
574 int cached_itable_index(size_t idnum); | |
575 | |
576 // annotations support | |
577 typeArrayOop class_annotations() const { return _class_annotations; } | |
578 objArrayOop fields_annotations() const { return _fields_annotations; } | |
579 objArrayOop methods_annotations() const { return _methods_annotations; } | |
580 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
581 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
582 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
583 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
584 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
585 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
586 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
587 typeArrayOop get_method_annotations_of(int idnum) | |
588 { return get_method_annotations_from(idnum, _methods_annotations); } | |
589 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
590 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
591 typeArrayOop get_method_default_annotations_of(int idnum) | |
592 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
593 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
594 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
595 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
596 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
597 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
598 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
599 | |
600 // allocation | |
601 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
602 instanceOop allocate_instance(TRAPS); | |
603 instanceOop allocate_permanent_instance(TRAPS); | |
604 | |
605 // additional member function to return a handle | |
606 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
607 | |
608 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
609 // Helper function | |
610 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
611 | |
612 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
613 // if not, throw either an Error or an Exception. | |
614 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
615 | |
616 // initialization | |
617 void call_class_initializer(TRAPS); | |
618 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
619 | |
620 // OopMapCache support | |
621 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
622 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
623 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
624 | |
625 // JNI identifier support (for static fields - for jni performance) | |
626 JNIid* jni_ids() { return _jni_ids; } | |
627 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
628 JNIid* jni_id_for(int offset); | |
629 | |
630 // maintenance of deoptimization dependencies | |
631 int mark_dependent_nmethods(DepChange& changes); | |
632 void add_dependent_nmethod(nmethod* nm); | |
633 void remove_dependent_nmethod(nmethod* nm); | |
634 | |
635 // On-stack replacement support | |
636 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
637 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
638 void add_osr_nmethod(nmethod* n); | |
639 void remove_osr_nmethod(nmethod* n); | |
1783 | 640 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; |
0 | 641 |
642 // Breakpoint support (see methods on methodOop for details) | |
643 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
644 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
645 | |
646 // support for stub routines | |
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647 static ByteSize init_state_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_state)); } |
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648 static ByteSize init_thread_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_thread)); } |
0 | 649 |
650 // subclass/subinterface checks | |
651 bool implements_interface(klassOop k) const; | |
652 | |
653 // Access to implementors of an interface. We only store the count | |
654 // of implementors, and in case, there are only a few | |
655 // implementors, we store them in a short list. | |
656 // This accessor returns NULL if we walk off the end of the list. | |
657 klassOop implementor(int i) const { | |
658 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
659 } | |
660 int nof_implementors() const { return _nof_implementors; } | |
661 void add_implementor(klassOop k); // k is a new class that implements this interface | |
662 void init_implementor(); // initialize | |
663 | |
664 // link this class into the implementors list of every interface it implements | |
665 void process_interfaces(Thread *thread); | |
666 | |
667 // virtual operations from Klass | |
668 bool is_leaf_class() const { return _subklass == NULL; } | |
669 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
670 bool compute_is_subtype_of(klassOop k); | |
671 bool can_be_primary_super_slow() const; | |
672 klassOop java_super() const { return super(); } | |
673 int oop_size(oop obj) const { return size_helper(); } | |
674 int klass_oop_size() const { return object_size(); } | |
675 bool oop_is_instance_slow() const { return true; } | |
676 | |
677 // Iterators | |
678 void do_local_static_fields(FieldClosure* cl); | |
679 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
680 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
681 | |
682 void methods_do(void f(methodOop method)); | |
683 void array_klasses_do(void f(klassOop k)); | |
684 void with_array_klasses_do(void f(klassOop k)); | |
685 bool super_types_do(SuperTypeClosure* blk); | |
686 | |
687 // Casting from klassOop | |
688 static instanceKlass* cast(klassOop k) { | |
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689 assert(k->is_klass(), "must be"); |
0 | 690 Klass* kp = k->klass_part(); |
691 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
692 return (instanceKlass*) kp; | |
693 } | |
694 | |
695 // Sizing (in words) | |
696 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
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697 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } |
0 | 698 static int vtable_start_offset() { return header_size(); } |
699 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
700 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
701 | |
702 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
703 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
704 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
705 | |
706 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } | |
707 | |
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708 address static_field_addr(int offset); |
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709 |
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710 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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711 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); |
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712 } |
0 | 713 |
714 // Allocation profiling support | |
715 juint alloc_size() const { return _alloc_count * size_helper(); } | |
716 void set_alloc_size(juint n) {} | |
717 | |
718 // Use this to return the size of an instance in heap words: | |
719 int size_helper() const { | |
720 return layout_helper_to_size_helper(layout_helper()); | |
721 } | |
722 | |
723 // This bit is initialized in classFileParser.cpp. | |
724 // It is false under any of the following conditions: | |
725 // - the class is abstract (including any interface) | |
726 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
727 // - the class size is larger than FastAllocateSizeLimit | |
728 // - the class is java/lang/Class, which cannot be allocated directly | |
729 bool can_be_fastpath_allocated() const { | |
730 return !layout_helper_needs_slow_path(layout_helper()); | |
731 } | |
732 | |
733 // Java vtable/itable | |
734 klassVtable* vtable() const; // return new klassVtable wrapper | |
735 inline methodOop method_at_vtable(int index); | |
736 klassItable* itable() const; // return new klassItable wrapper | |
737 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
738 | |
739 // Garbage collection | |
740 void oop_follow_contents(oop obj); | |
741 int oop_adjust_pointers(oop obj); | |
742 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
743 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
744 | |
745 void follow_weak_klass_links( | |
746 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
747 void release_C_heap_structures(); | |
748 | |
749 // Parallel Scavenge and Parallel Old | |
750 PARALLEL_GC_DECLS | |
751 | |
752 // Naming | |
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753 const char* signature_name() const; |
0 | 754 |
755 // Iterators | |
756 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
757 return oop_oop_iterate_v(obj, blk); | |
758 } | |
759 | |
760 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
761 return oop_oop_iterate_v_m(obj, blk, mr); | |
762 } | |
763 | |
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764 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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765 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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766 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
0 | 767 MemRegion mr); |
768 | |
769 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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770 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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771 |
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772 #ifndef SERIALGC |
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773 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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774 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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775 |
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776 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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777 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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778 #endif // !SERIALGC |
0 | 779 |
780 private: | |
781 // initialization state | |
782 #ifdef ASSERT | |
783 void set_init_state(ClassState state); | |
784 #else | |
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785 void set_init_state(ClassState state) { _init_state = (u1)state; } |
0 | 786 #endif |
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787 void set_rewritten() { _misc_flags |= REWRITTEN; } |
0 | 788 void set_init_thread(Thread *thread) { _init_thread = thread; } |
789 | |
790 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
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791 // The RedefineClasses() API can cause new method idnums to be needed |
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792 // which will cause the caches to grow. Safety requires different |
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793 // cache management logic if the caches can grow instead of just |
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794 // going from NULL to non-NULL. |
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795 bool idnum_can_increment() const { return has_been_redefined(); } |
0 | 796 jmethodID* methods_jmethod_ids_acquire() const |
797 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
798 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
799 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
800 | |
801 int* methods_cached_itable_indices_acquire() const | |
802 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
803 void release_set_methods_cached_itable_indices(int* indices) | |
804 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
805 | |
806 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
807 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
808 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
809 | |
810 // Offsets for memory management | |
811 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
812 oop* adr_methods() const { return (oop*)&this->_methods;} | |
813 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
814 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
815 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
816 oop* adr_fields() const { return (oop*)&this->_fields;} | |
817 oop* adr_constants() const { return (oop*)&this->_constants;} | |
818 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
819 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
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820 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
0 | 821 oop* adr_signers() const { return (oop*)&this->_signers;} |
822 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
823 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
824 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} | |
825 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
826 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
827 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
828 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
829 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
830 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
831 | |
832 // Static methods that are used to implement member methods where an exposed this pointer | |
833 // is needed due to possible GCs | |
834 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
835 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
836 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
837 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
838 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
839 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
840 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
841 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
842 /* jni_id_for_impl for jfieldID only */ | |
843 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
844 | |
845 // Returns the array class for the n'th dimension | |
846 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
847 | |
848 // Returns the array class with this class as element type | |
849 klassOop array_klass_impl(bool or_null, TRAPS); | |
850 | |
851 public: | |
852 // sharing support | |
853 virtual void remove_unshareable_info(); | |
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854 virtual void shared_symbols_iterate(SymbolClosure* closure); |
0 | 855 |
856 // jvm support | |
857 jint compute_modifier_flags(TRAPS) const; | |
858 | |
859 public: | |
860 // JVMTI support | |
861 jint jvmti_class_status() const; | |
862 | |
863 public: | |
864 // Printing | |
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865 void oop_print_value_on(oop obj, outputStream* st); |
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866 #ifndef PRODUCT |
0 | 867 void oop_print_on (oop obj, outputStream* st); |
868 | |
869 void print_dependent_nmethods(bool verbose = false); | |
870 bool is_dependent_nmethod(nmethod* nm); | |
871 #endif | |
872 | |
873 // Verification | |
874 const char* internal_name() const; | |
875 void oop_verify_on(oop obj, outputStream* st); | |
876 }; | |
877 | |
878 inline methodOop instanceKlass::method_at_vtable(int index) { | |
879 #ifndef PRODUCT | |
880 assert(index >= 0, "valid vtable index"); | |
881 if (DebugVtables) { | |
882 verify_vtable_index(index); | |
883 } | |
884 #endif | |
885 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
886 return ve[index].method(); | |
887 } | |
888 | |
889 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
890 if (annos == NULL || annos->length() <= idnum) { | |
891 return NULL; | |
892 } | |
893 return typeArrayOop(annos->obj_at(idnum)); | |
894 } | |
895 | |
896 // for adding methods | |
897 // UNSET_IDNUM return means no more ids available | |
898 inline u2 instanceKlass::next_method_idnum() { | |
899 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
900 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
901 } else { | |
902 return _idnum_allocated_count++; | |
903 } | |
904 } | |
905 | |
906 | |
907 /* JNIid class for jfieldIDs only */ | |
908 class JNIid: public CHeapObj { | |
909 friend class VMStructs; | |
910 private: | |
911 klassOop _holder; | |
912 JNIid* _next; | |
913 int _offset; | |
914 #ifdef ASSERT | |
915 bool _is_static_field_id; | |
916 #endif | |
917 | |
918 public: | |
919 // Accessors | |
920 klassOop holder() const { return _holder; } | |
921 int offset() const { return _offset; } | |
922 JNIid* next() { return _next; } | |
923 // Constructor | |
924 JNIid(klassOop holder, int offset, JNIid* next); | |
925 // Identifier lookup | |
926 JNIid* find(int offset); | |
927 | |
2376
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928 bool find_local_field(fieldDescriptor* fd) { |
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929 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); |
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930 } |
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931 |
0 | 932 // Garbage collection support |
933 oop* holder_addr() { return (oop*)&_holder; } | |
934 void oops_do(OopClosure* f); | |
935 static void deallocate(JNIid* id); | |
936 // Debugging | |
937 #ifdef ASSERT | |
938 bool is_static_field_id() const { return _is_static_field_id; } | |
939 void set_is_static_field_id() { _is_static_field_id = true; } | |
940 #endif | |
941 void verify(klassOop holder); | |
942 }; | |
943 | |
944 | |
945 // If breakpoints are more numerous than just JVMTI breakpoints, | |
946 // consider compressing this data structure. | |
947 // It is currently a simple linked list defined in methodOop.hpp. | |
948 | |
949 class BreakpointInfo; | |
950 | |
951 | |
952 // A collection point for interesting information about the previous | |
953 // version(s) of an instanceKlass. This class uses weak references to | |
954 // the information so that the information may be collected as needed | |
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955 // by the system. If the information is shared, then a regular |
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956 // reference must be used because a weak reference would be seen as |
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957 // collectible. A GrowableArray of PreviousVersionNodes is attached |
0 | 958 // to the instanceKlass as needed. See PreviousVersionWalker below. |
959 class PreviousVersionNode : public CHeapObj { | |
960 private: | |
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961 // A shared ConstantPool is never collected so we'll always have |
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962 // a reference to it so we can update items in the cache. We'll |
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963 // have a weak reference to a non-shared ConstantPool until all |
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964 // of the methods (EMCP or obsolete) have been collected; the |
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965 // non-shared ConstantPool becomes collectible at that point. |
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966 jobject _prev_constant_pool; // regular or weak reference |
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967 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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968 |
0 | 969 // If the previous version of the instanceKlass doesn't have any |
970 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
971 // EMCP methods have been collected, then _prev_EMCP_methods can | |
972 // have a length of zero. | |
973 GrowableArray<jweak>* _prev_EMCP_methods; | |
974 | |
975 public: | |
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976 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
0 | 977 GrowableArray<jweak>* prev_EMCP_methods); |
978 ~PreviousVersionNode(); | |
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979 jobject prev_constant_pool() const { |
0 | 980 return _prev_constant_pool; |
981 } | |
982 GrowableArray<jweak>* prev_EMCP_methods() const { | |
983 return _prev_EMCP_methods; | |
984 } | |
985 }; | |
986 | |
987 | |
988 // A Handle-ized version of PreviousVersionNode. | |
989 class PreviousVersionInfo : public ResourceObj { | |
990 private: | |
991 constantPoolHandle _prev_constant_pool_handle; | |
992 // If the previous version of the instanceKlass doesn't have any | |
993 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
994 // methods cannot be collected while we hold a handle, | |
995 // _prev_EMCP_methods should never have a length of zero. | |
996 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
997 | |
998 public: | |
999 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
1000 ~PreviousVersionInfo(); | |
1001 constantPoolHandle prev_constant_pool_handle() const { | |
1002 return _prev_constant_pool_handle; | |
1003 } | |
1004 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
1005 return _prev_EMCP_method_handles; | |
1006 } | |
1007 }; | |
1008 | |
1009 | |
1010 // Helper object for walking previous versions. This helper cleans up | |
1011 // the Handles that it allocates when the helper object is destroyed. | |
1012 // The PreviousVersionInfo object returned by next_previous_version() | |
1013 // is only valid until a subsequent call to next_previous_version() or | |
1014 // the helper object is destroyed. | |
1015 class PreviousVersionWalker : public StackObj { | |
1016 private: | |
1017 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
1018 int _current_index; | |
1019 // Fields for cleaning up when we are done walking the previous versions: | |
1020 // A HandleMark for the PreviousVersionInfo handles: | |
1021 HandleMark _hm; | |
1022 | |
1023 // It would be nice to have a ResourceMark field in this helper also, | |
1024 // but the ResourceMark code says to be careful to delete handles held | |
1025 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
1026 // can't guarantee the order in which the fields are destroyed, we | |
1027 // have to let the creator of the PreviousVersionWalker object do | |
1028 // the right thing. Also, adding a ResourceMark here causes an | |
1029 // include loop. | |
1030 | |
1031 // A pointer to the current info object so we can handle the deletes. | |
1032 PreviousVersionInfo * _current_p; | |
1033 | |
1034 public: | |
1035 PreviousVersionWalker(instanceKlass *ik); | |
1036 ~PreviousVersionWalker(); | |
1037 | |
1038 // Return the interesting information for the next previous version | |
1039 // of the klass. Returns NULL if there are no more previous versions. | |
1040 PreviousVersionInfo* next_previous_version(); | |
1041 }; | |
1972 | 1042 |
3939 | 1043 |
1044 // | |
1045 // nmethodBucket is used to record dependent nmethods for | |
1046 // deoptimization. nmethod dependencies are actually <klass, method> | |
1047 // pairs but we really only care about the klass part for purposes of | |
1048 // finding nmethods which might need to be deoptimized. Instead of | |
1049 // recording the method, a count of how many times a particular nmethod | |
1050 // was recorded is kept. This ensures that any recording errors are | |
1051 // noticed since an nmethod should be removed as many times are it's | |
1052 // added. | |
1053 // | |
1054 class nmethodBucket: public CHeapObj { | |
1055 friend class VMStructs; | |
1056 private: | |
1057 nmethod* _nmethod; | |
1058 int _count; | |
1059 nmethodBucket* _next; | |
1060 | |
1061 public: | |
1062 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { | |
1063 _nmethod = nmethod; | |
1064 _next = next; | |
1065 _count = 1; | |
1066 } | |
1067 int count() { return _count; } | |
1068 int increment() { _count += 1; return _count; } | |
1069 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } | |
1070 nmethodBucket* next() { return _next; } | |
1071 void set_next(nmethodBucket* b) { _next = b; } | |
1072 nmethod* get_nmethod() { return _nmethod; } | |
1073 }; | |
1074 | |
1972 | 1075 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP |