Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.hpp @ 973:ad6585fd4087
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Reviewed-by: kamg, phh
author | acorn |
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date | Fri, 04 Sep 2009 12:53:02 -0400 |
parents | be93aad57795 |
children | 26b774d693aa |
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0 | 1 /* |
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2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An instanceKlass is the VM level representation of a Java class. | |
26 // It contains all information needed for at class at execution runtime. | |
27 | |
28 // instanceKlass layout: | |
29 // [header ] klassOop | |
30 // [klass pointer ] klassOop | |
31 // [C++ vtbl pointer ] Klass | |
32 // [subtype cache ] Klass | |
33 // [instance size ] Klass | |
34 // [java mirror ] Klass | |
35 // [super ] Klass | |
36 // [access_flags ] Klass | |
37 // [name ] Klass | |
38 // [first subklass ] Klass | |
39 // [next sibling ] Klass | |
40 // [array klasses ] | |
41 // [methods ] | |
42 // [local interfaces ] | |
43 // [transitive interfaces ] | |
44 // [number of implementors ] | |
45 // [implementors ] klassOop[2] | |
46 // [fields ] | |
47 // [constants ] | |
48 // [class loader ] | |
49 // [protection domain ] | |
50 // [signers ] | |
51 // [source file name ] | |
52 // [inner classes ] | |
53 // [static field size ] | |
54 // [nonstatic field size ] | |
55 // [static oop fields size ] | |
56 // [nonstatic oop maps size ] | |
57 // [has finalize method ] | |
58 // [deoptimization mark bit ] | |
59 // [initialization state ] | |
60 // [initializing thread ] | |
61 // [Java vtable length ] | |
62 // [oop map cache (stack maps) ] | |
63 // [EMBEDDED Java vtable ] size in words = vtable_len | |
64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size | |
65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size | |
66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
67 // | |
68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating | |
69 // where oops are located in instances of this klass. | |
70 | |
71 | |
72 // forward declaration for class -- see below for definition | |
73 class SuperTypeClosure; | |
74 class OopMapBlock; | |
75 class JNIid; | |
76 class jniIdMapBase; | |
77 class BreakpointInfo; | |
78 class fieldDescriptor; | |
79 class DepChange; | |
80 class nmethodBucket; | |
81 class PreviousVersionNode; | |
82 class JvmtiCachedClassFieldMap; | |
83 | |
84 // This is used in iterators below. | |
85 class FieldClosure: public StackObj { | |
86 public: | |
87 virtual void do_field(fieldDescriptor* fd) = 0; | |
88 }; | |
89 | |
90 #ifndef PRODUCT | |
91 // Print fields. | |
92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
93 class FieldPrinter: public FieldClosure { | |
94 oop _obj; | |
95 outputStream* _st; | |
96 public: | |
97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
98 void do_field(fieldDescriptor* fd); | |
99 }; | |
100 #endif // !PRODUCT | |
101 | |
102 class instanceKlass: public Klass { | |
103 friend class VMStructs; | |
104 public: | |
105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
106 // of the class loading & initialization procedure, and the use of the states. | |
107 enum ClassState { | |
108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
109 allocated, // allocated (but not yet linked) | |
110 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
111 linked, // successfully linked/verified (but not initialized yet) | |
112 being_initialized, // currently running class initializer | |
113 fully_initialized, // initialized (successfull final state) | |
114 initialization_error // error happened during initialization | |
115 }; | |
116 | |
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117 // smaller footprint for boolean flags |
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118 enum ClassFlags { |
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119 _noflags = 0, // initial value |
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120 _rewritten = 0x00000001U, // rewritten |
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121 _should_verify = 0x00000002U, // defineClass specified conditional verification |
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122 _has_nonstatic_fields = 0x00000004U, // for sizing with UseCompressedOops |
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123 _is_marked_dependent = 0x00000008U // used for marking during flushing and deoptimization |
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124 }; |
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125 |
0 | 126 public: |
127 oop* oop_block_beg() const { return adr_array_klasses(); } | |
128 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
129 | |
130 enum { | |
131 implementors_limit = 2 // how many implems can we track? | |
132 }; | |
133 | |
134 protected: | |
135 // | |
136 // The oop block. See comment in klass.hpp before making changes. | |
137 // | |
138 | |
139 // Array classes holding elements of this class. | |
140 klassOop _array_klasses; | |
141 // Method array. | |
142 objArrayOop _methods; | |
143 // Int array containing the original order of method in the class file (for | |
144 // JVMTI). | |
145 typeArrayOop _method_ordering; | |
146 // Interface (klassOops) this class declares locally to implement. | |
147 objArrayOop _local_interfaces; | |
148 // Interface (klassOops) this class implements transitively. | |
149 objArrayOop _transitive_interfaces; | |
150 // Instance and static variable information, 5-tuples of shorts [access, name | |
151 // index, sig index, initval index, offset]. | |
152 typeArrayOop _fields; | |
153 // Constant pool for this class. | |
154 constantPoolOop _constants; | |
155 // Class loader used to load this class, NULL if VM loader used. | |
156 oop _class_loader; | |
157 // Protection domain. | |
158 oop _protection_domain; | |
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159 // Host class, which grants its access privileges to this class also. |
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160 // This is only non-null for an anonymous class (AnonymousClasses enabled). |
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161 // The host class is either named, or a previously loaded anonymous class. |
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162 klassOop _host_klass; |
0 | 163 // Class signers. |
164 objArrayOop _signers; | |
165 // Name of source file containing this klass, NULL if not specified. | |
166 symbolOop _source_file_name; | |
167 // the source debug extension for this klass, NULL if not specified. | |
168 symbolOop _source_debug_extension; | |
169 // inner_classes attribute. | |
170 typeArrayOop _inner_classes; | |
171 // Implementors of this interface (not valid if it overflows) | |
172 klassOop _implementors[implementors_limit]; | |
173 // Generic signature, or null if none. | |
174 symbolOop _generic_signature; | |
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175 // invokedynamic bootstrap method (a java.dyn.MethodHandle) |
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176 oop _bootstrap_method; |
0 | 177 // Annotations for this class, or null if none. |
178 typeArrayOop _class_annotations; | |
179 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
180 // Indices correspond to entries (not indices) in fields array. | |
181 objArrayOop _fields_annotations; | |
182 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
183 // Index is the idnum, which is initially the same as the methods array index. | |
184 objArrayOop _methods_annotations; | |
185 // Annotation objects (byte arrays) for methods' parameters, or null if no | |
186 // such annotations. | |
187 // Index is the idnum, which is initially the same as the methods array index. | |
188 objArrayOop _methods_parameter_annotations; | |
189 // Annotation objects (byte arrays) for methods' default values, or null if no | |
190 // such annotations. | |
191 // Index is the idnum, which is initially the same as the methods array index. | |
192 objArrayOop _methods_default_annotations; | |
193 | |
194 // | |
195 // End of the oop block. | |
196 // | |
197 | |
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198 // Number of heapOopSize words used by non-static fields in this klass |
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199 // (including inherited fields but after header_size()). |
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200 int _nonstatic_field_size; |
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201 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
0 | 202 int _static_oop_field_size;// number of static oop fields in this klass |
203 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass | |
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204 int _class_flags; // internal class state flags |
0 | 205 u2 _minor_version; // minor version number of class file |
206 u2 _major_version; // major version number of class file | |
207 ClassState _init_state; // state of class | |
208 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
209 int _vtable_len; // length of Java vtable (in words) | |
210 int _itable_len; // length of Java itable (in words) | |
211 ReferenceType _reference_type; // reference type | |
212 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
213 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
214 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
215 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
216 nmethodBucket* _dependencies; // list of dependent nmethods | |
217 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
218 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
219 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
220 // Array of interesting part(s) of the previous version(s) of this | |
221 // instanceKlass. See PreviousVersionWalker below. | |
222 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
223 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
224 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
225 // JVMTI fields can be moved to their own structure - see 6315920 | |
226 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
227 jint _cached_class_file_len; // JVMTI: length of above | |
228 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
229 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
230 | |
231 // embedded Java vtable follows here | |
232 // embedded Java itables follows here | |
233 // embedded static fields follows here | |
234 // embedded nonstatic oop-map blocks follows here | |
235 | |
236 friend class instanceKlassKlass; | |
237 friend class SystemDictionary; | |
238 | |
239 public: | |
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240 bool has_nonstatic_fields() const { return (_class_flags & _has_nonstatic_fields) != 0; } |
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241 void set_has_nonstatic_fields() { _class_flags |= _has_nonstatic_fields; } |
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242 |
0 | 243 // field sizes |
244 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
245 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
246 | |
247 int static_field_size() const { return _static_field_size; } | |
248 void set_static_field_size(int size) { _static_field_size = size; } | |
249 | |
250 int static_oop_field_size() const { return _static_oop_field_size; } | |
251 void set_static_oop_field_size(int size) { _static_oop_field_size = size; } | |
252 | |
253 // Java vtable | |
254 int vtable_length() const { return _vtable_len; } | |
255 void set_vtable_length(int len) { _vtable_len = len; } | |
256 | |
257 // Java itable | |
258 int itable_length() const { return _itable_len; } | |
259 void set_itable_length(int len) { _itable_len = len; } | |
260 | |
261 // array klasses | |
262 klassOop array_klasses() const { return _array_klasses; } | |
263 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
264 | |
265 // methods | |
266 objArrayOop methods() const { return _methods; } | |
267 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
268 methodOop method_with_idnum(int idnum); | |
269 | |
270 // method ordering | |
271 typeArrayOop method_ordering() const { return _method_ordering; } | |
272 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
273 | |
274 // interfaces | |
275 objArrayOop local_interfaces() const { return _local_interfaces; } | |
276 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
277 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
278 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
279 | |
280 // fields | |
281 // Field info extracted from the class file and stored | |
282 // as an array of 7 shorts | |
283 enum FieldOffset { | |
284 access_flags_offset = 0, | |
285 name_index_offset = 1, | |
286 signature_index_offset = 2, | |
287 initval_index_offset = 3, | |
288 low_offset = 4, | |
289 high_offset = 5, | |
290 generic_signature_offset = 6, | |
291 next_offset = 7 | |
292 }; | |
293 | |
294 typeArrayOop fields() const { return _fields; } | |
295 int offset_from_fields( int index ) const { | |
296 return build_int_from_shorts( fields()->ushort_at(index + low_offset), | |
297 fields()->ushort_at(index + high_offset) ); | |
298 } | |
299 | |
300 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } | |
301 | |
302 // inner classes | |
303 typeArrayOop inner_classes() const { return _inner_classes; } | |
304 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
305 | |
306 enum InnerClassAttributeOffset { | |
307 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
308 inner_class_inner_class_info_offset = 0, | |
309 inner_class_outer_class_info_offset = 1, | |
310 inner_class_inner_name_offset = 2, | |
311 inner_class_access_flags_offset = 3, | |
312 inner_class_next_offset = 4 | |
313 }; | |
314 | |
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315 // method override check |
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316 bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS); |
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317 |
0 | 318 // package |
319 bool is_same_class_package(klassOop class2); | |
320 bool is_same_class_package(oop classloader2, symbolOop classname2); | |
321 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); | |
322 | |
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323 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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324 klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) { |
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325 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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326 return compute_enclosing_class_impl(self, simple_name_result, THREAD); |
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327 } |
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328 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
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329 symbolOop& simple_name_result, TRAPS); |
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330 |
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331 // tell if two classes have the same enclosing class (at package level) |
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332 bool is_same_package_member(klassOop class2, TRAPS) { |
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333 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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334 return is_same_package_member_impl(self, class2, THREAD); |
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335 } |
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336 static bool is_same_package_member_impl(instanceKlassHandle self, |
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337 klassOop class2, TRAPS); |
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338 |
0 | 339 // initialization state |
340 bool is_loaded() const { return _init_state >= loaded; } | |
341 bool is_linked() const { return _init_state >= linked; } | |
342 bool is_initialized() const { return _init_state == fully_initialized; } | |
343 bool is_not_initialized() const { return _init_state < being_initialized; } | |
344 bool is_being_initialized() const { return _init_state == being_initialized; } | |
345 bool is_in_error_state() const { return _init_state == initialization_error; } | |
346 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
347 int get_init_state() { return _init_state; } // Useful for debugging | |
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348 bool is_rewritten() const { return (_class_flags & _rewritten) != 0; } |
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349 |
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350 // defineClass specified verification |
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351 bool should_verify_class() const { return (_class_flags & _should_verify) != 0; } |
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352 void set_should_verify_class() { _class_flags |= _should_verify; } |
0 | 353 |
354 // marking | |
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355 bool is_marked_dependent() const { return (_class_flags & _is_marked_dependent) != 0; } |
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356 void set_is_marked_dependent() { _class_flags |= _is_marked_dependent; } |
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357 void clear_is_marked_dependent() { _class_flags &= ~_is_marked_dependent; } |
0 | 358 |
359 // initialization (virtuals from Klass) | |
360 bool should_be_initialized() const; // means that initialize should be called | |
361 void initialize(TRAPS); | |
362 void link_class(TRAPS); | |
363 bool link_class_or_fail(TRAPS); // returns false on failure | |
364 void unlink_class(); | |
365 void rewrite_class(TRAPS); | |
366 methodOop class_initializer(); | |
367 | |
368 // set the class to initialized if no static initializer is present | |
369 void eager_initialize(Thread *thread); | |
370 | |
371 // reference type | |
372 ReferenceType reference_type() const { return _reference_type; } | |
373 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
374 | |
375 // find local field, returns true if found | |
376 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
377 // find field in direct superinterfaces, returns the interface in which the field is defined | |
378 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
379 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
380 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
381 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
382 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const; | |
383 | |
384 // find a non-static or static field given its offset within the class. | |
385 bool contains_field_offset(int offset) { | |
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386 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
0 | 387 } |
388 | |
389 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
390 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
391 | |
392 // find a local method (returns NULL if not found) | |
393 methodOop find_method(symbolOop name, symbolOop signature) const; | |
394 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); | |
395 | |
396 // lookup operation (returns NULL if not found) | |
397 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; | |
398 | |
399 // lookup a method in all the interfaces that this class implements | |
400 // (returns NULL if not found) | |
401 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; | |
402 | |
403 // constant pool | |
404 constantPoolOop constants() const { return _constants; } | |
405 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
406 | |
407 // class loader | |
408 oop class_loader() const { return _class_loader; } | |
409 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
410 | |
411 // protection domain | |
412 oop protection_domain() { return _protection_domain; } | |
413 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
414 | |
431
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415 // host class |
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416 oop host_klass() const { return _host_klass; } |
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417 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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418 bool is_anonymous() const { return _host_klass != NULL; } |
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419 |
0 | 420 // signers |
421 objArrayOop signers() const { return _signers; } | |
422 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
423 | |
424 // source file name | |
425 symbolOop source_file_name() const { return _source_file_name; } | |
426 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } | |
427 | |
428 // minor and major version numbers of class file | |
429 u2 minor_version() const { return _minor_version; } | |
430 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
431 u2 major_version() const { return _major_version; } | |
432 void set_major_version(u2 major_version) { _major_version = major_version; } | |
433 | |
434 // source debug extension | |
435 symbolOop source_debug_extension() const { return _source_debug_extension; } | |
436 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } | |
437 | |
438 // nonstatic oop-map blocks | |
439 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
440 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; } | |
441 | |
442 // RedefineClasses() support for previous versions: | |
443 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
444 int emcp_method_count); | |
445 bool has_previous_version() const; | |
446 void init_previous_versions() { | |
447 _previous_versions = NULL; | |
448 } | |
449 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
450 return _previous_versions; | |
451 } | |
452 | |
453 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
454 void set_cached_class_file(unsigned char *class_file_bytes, | |
455 jint class_file_len) { _cached_class_file_len = class_file_len; | |
456 _cached_class_file_bytes = class_file_bytes; } | |
457 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
458 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
459 | |
460 // JVMTI: Support for caching of field indices, types, and offsets | |
461 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
462 _jvmti_cached_class_field_map = descriptor; | |
463 } | |
464 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
465 return _jvmti_cached_class_field_map; | |
466 } | |
467 | |
468 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
469 inline u2 next_method_idnum(); | |
470 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
471 | |
472 // generics support | |
473 symbolOop generic_signature() const { return _generic_signature; } | |
474 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } | |
475 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } | |
476 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
477 void set_enclosing_method_indices(u2 class_index, | |
478 u2 method_index) { _enclosing_method_class_index = class_index; | |
479 _enclosing_method_method_index = method_index; } | |
480 | |
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481 // JSR 292 support |
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482 oop bootstrap_method() const { return _bootstrap_method; } |
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483 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); } |
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484 |
0 | 485 // jmethodID support |
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486 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, |
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487 jmethodID new_id, jmethodID* new_jmeths); |
0 | 488 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); |
489 jmethodID jmethod_id_or_null(methodOop method); | |
490 | |
491 // cached itable index support | |
492 void set_cached_itable_index(size_t idnum, int index); | |
493 int cached_itable_index(size_t idnum); | |
494 | |
495 // annotations support | |
496 typeArrayOop class_annotations() const { return _class_annotations; } | |
497 objArrayOop fields_annotations() const { return _fields_annotations; } | |
498 objArrayOop methods_annotations() const { return _methods_annotations; } | |
499 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
500 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
501 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
502 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
503 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
504 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
505 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
506 typeArrayOop get_method_annotations_of(int idnum) | |
507 { return get_method_annotations_from(idnum, _methods_annotations); } | |
508 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
509 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
510 typeArrayOop get_method_default_annotations_of(int idnum) | |
511 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
512 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
513 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
514 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
515 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
516 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
517 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
518 | |
519 // allocation | |
520 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
521 instanceOop allocate_instance(TRAPS); | |
522 instanceOop allocate_permanent_instance(TRAPS); | |
523 | |
524 // additional member function to return a handle | |
525 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
526 | |
527 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
528 // Helper function | |
529 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
530 | |
531 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
532 // if not, throw either an Error or an Exception. | |
533 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
534 | |
535 // initialization | |
536 void call_class_initializer(TRAPS); | |
537 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
538 | |
539 // OopMapCache support | |
540 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
541 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
542 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
543 | |
544 // JNI identifier support (for static fields - for jni performance) | |
545 JNIid* jni_ids() { return _jni_ids; } | |
546 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
547 JNIid* jni_id_for(int offset); | |
548 | |
549 // maintenance of deoptimization dependencies | |
550 int mark_dependent_nmethods(DepChange& changes); | |
551 void add_dependent_nmethod(nmethod* nm); | |
552 void remove_dependent_nmethod(nmethod* nm); | |
553 | |
554 // On-stack replacement support | |
555 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
556 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
557 void add_osr_nmethod(nmethod* n); | |
558 void remove_osr_nmethod(nmethod* n); | |
559 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; | |
560 | |
561 // Breakpoint support (see methods on methodOop for details) | |
562 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
563 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
564 | |
565 // support for stub routines | |
566 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } | |
567 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } | |
568 | |
569 // subclass/subinterface checks | |
570 bool implements_interface(klassOop k) const; | |
571 | |
572 // Access to implementors of an interface. We only store the count | |
573 // of implementors, and in case, there are only a few | |
574 // implementors, we store them in a short list. | |
575 // This accessor returns NULL if we walk off the end of the list. | |
576 klassOop implementor(int i) const { | |
577 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
578 } | |
579 int nof_implementors() const { return _nof_implementors; } | |
580 void add_implementor(klassOop k); // k is a new class that implements this interface | |
581 void init_implementor(); // initialize | |
582 | |
583 // link this class into the implementors list of every interface it implements | |
584 void process_interfaces(Thread *thread); | |
585 | |
586 // virtual operations from Klass | |
587 bool is_leaf_class() const { return _subklass == NULL; } | |
588 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
589 bool compute_is_subtype_of(klassOop k); | |
590 bool can_be_primary_super_slow() const; | |
591 klassOop java_super() const { return super(); } | |
592 int oop_size(oop obj) const { return size_helper(); } | |
593 int klass_oop_size() const { return object_size(); } | |
594 bool oop_is_instance_slow() const { return true; } | |
595 | |
596 // Iterators | |
597 void do_local_static_fields(FieldClosure* cl); | |
598 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
599 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
600 | |
601 void methods_do(void f(methodOop method)); | |
602 void array_klasses_do(void f(klassOop k)); | |
603 void with_array_klasses_do(void f(klassOop k)); | |
604 bool super_types_do(SuperTypeClosure* blk); | |
605 | |
606 // Casting from klassOop | |
607 static instanceKlass* cast(klassOop k) { | |
608 Klass* kp = k->klass_part(); | |
609 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
610 return (instanceKlass*) kp; | |
611 } | |
612 | |
613 // Sizing (in words) | |
614 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
615 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } | |
616 static int vtable_start_offset() { return header_size(); } | |
617 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
618 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
619 | |
620 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
621 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
622 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
623 | |
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624 // Static field offset is an offset into the Heap, should be converted by |
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625 // based on UseCompressedOop for traversal |
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626 HeapWord* start_of_static_fields() const { |
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627 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); |
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628 } |
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629 |
0 | 630 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } |
631 | |
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632 int offset_of_static_fields() const { |
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633 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); |
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634 } |
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635 |
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636 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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637 return (OopMapBlock*) (start_of_static_fields() + static_field_size()); |
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638 } |
0 | 639 |
640 // Allocation profiling support | |
641 juint alloc_size() const { return _alloc_count * size_helper(); } | |
642 void set_alloc_size(juint n) {} | |
643 | |
644 // Use this to return the size of an instance in heap words: | |
645 int size_helper() const { | |
646 return layout_helper_to_size_helper(layout_helper()); | |
647 } | |
648 | |
649 // This bit is initialized in classFileParser.cpp. | |
650 // It is false under any of the following conditions: | |
651 // - the class is abstract (including any interface) | |
652 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
653 // - the class size is larger than FastAllocateSizeLimit | |
654 // - the class is java/lang/Class, which cannot be allocated directly | |
655 bool can_be_fastpath_allocated() const { | |
656 return !layout_helper_needs_slow_path(layout_helper()); | |
657 } | |
658 | |
659 // Java vtable/itable | |
660 klassVtable* vtable() const; // return new klassVtable wrapper | |
661 inline methodOop method_at_vtable(int index); | |
662 klassItable* itable() const; // return new klassItable wrapper | |
663 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
664 | |
665 // Garbage collection | |
666 void oop_follow_contents(oop obj); | |
667 void follow_static_fields(); | |
668 void adjust_static_fields(); | |
669 int oop_adjust_pointers(oop obj); | |
670 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
671 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
672 | |
673 void follow_weak_klass_links( | |
674 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
675 void release_C_heap_structures(); | |
676 | |
677 // Parallel Scavenge and Parallel Old | |
678 PARALLEL_GC_DECLS | |
679 | |
680 #ifndef SERIALGC | |
681 // Parallel Scavenge | |
682 void copy_static_fields(PSPromotionManager* pm); | |
683 void push_static_fields(PSPromotionManager* pm); | |
684 | |
685 // Parallel Old | |
686 void follow_static_fields(ParCompactionManager* cm); | |
687 void copy_static_fields(ParCompactionManager* cm); | |
688 void update_static_fields(); | |
689 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); | |
690 #endif // SERIALGC | |
691 | |
692 // Naming | |
693 char* signature_name() const; | |
694 | |
695 // Iterators | |
696 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
697 return oop_oop_iterate_v(obj, blk); | |
698 } | |
699 | |
700 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
701 return oop_oop_iterate_v_m(obj, blk, mr); | |
702 } | |
703 | |
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704 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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705 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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706 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
0 | 707 MemRegion mr); |
708 | |
709 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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710 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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711 |
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712 #ifndef SERIALGC |
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713 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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714 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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715 |
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716 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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717 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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718 #endif // !SERIALGC |
0 | 719 |
720 void iterate_static_fields(OopClosure* closure); | |
721 void iterate_static_fields(OopClosure* closure, MemRegion mr); | |
722 | |
723 private: | |
724 // initialization state | |
725 #ifdef ASSERT | |
726 void set_init_state(ClassState state); | |
727 #else | |
728 void set_init_state(ClassState state) { _init_state = state; } | |
729 #endif | |
973
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730 void clear_class_flags() { _class_flags = _noflags; } |
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731 void set_rewritten() { _class_flags |= _rewritten; } |
0 | 732 void set_init_thread(Thread *thread) { _init_thread = thread; } |
733 | |
734 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
735 jmethodID* methods_jmethod_ids_acquire() const | |
736 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
737 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
738 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
739 | |
740 int* methods_cached_itable_indices_acquire() const | |
741 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
742 void release_set_methods_cached_itable_indices(int* indices) | |
743 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
744 | |
745 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
746 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
747 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
748 | |
749 // Offsets for memory management | |
750 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
751 oop* adr_methods() const { return (oop*)&this->_methods;} | |
752 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
753 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
754 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
755 oop* adr_fields() const { return (oop*)&this->_fields;} | |
756 oop* adr_constants() const { return (oop*)&this->_constants;} | |
757 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
758 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
431
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759 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
0 | 760 oop* adr_signers() const { return (oop*)&this->_signers;} |
761 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} | |
762 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} | |
763 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
764 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
765 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} | |
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766 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} |
0 | 767 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} |
768 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
769 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
770 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
771 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
772 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
773 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
774 | |
775 // Static methods that are used to implement member methods where an exposed this pointer | |
776 // is needed due to possible GCs | |
777 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
778 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
779 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
780 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
781 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
782 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
783 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
784 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
785 /* jni_id_for_impl for jfieldID only */ | |
786 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
787 | |
788 // Returns the array class for the n'th dimension | |
789 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
790 | |
791 // Returns the array class with this class as element type | |
792 klassOop array_klass_impl(bool or_null, TRAPS); | |
793 | |
794 public: | |
795 // sharing support | |
796 virtual void remove_unshareable_info(); | |
797 void field_names_and_sigs_iterate(OopClosure* closure); | |
798 | |
799 // jvm support | |
800 jint compute_modifier_flags(TRAPS) const; | |
801 | |
802 public: | |
803 // JVMTI support | |
804 jint jvmti_class_status() const; | |
805 | |
806 #ifndef PRODUCT | |
807 public: | |
808 // Printing | |
809 void oop_print_on (oop obj, outputStream* st); | |
810 void oop_print_value_on(oop obj, outputStream* st); | |
811 | |
812 void print_dependent_nmethods(bool verbose = false); | |
813 bool is_dependent_nmethod(nmethod* nm); | |
814 #endif | |
815 | |
816 public: | |
817 // Verification | |
818 const char* internal_name() const; | |
819 void oop_verify_on(oop obj, outputStream* st); | |
820 | |
821 #ifndef PRODUCT | |
822 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; | |
823 #endif | |
824 }; | |
825 | |
826 inline methodOop instanceKlass::method_at_vtable(int index) { | |
827 #ifndef PRODUCT | |
828 assert(index >= 0, "valid vtable index"); | |
829 if (DebugVtables) { | |
830 verify_vtable_index(index); | |
831 } | |
832 #endif | |
833 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
834 return ve[index].method(); | |
835 } | |
836 | |
837 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
838 if (annos == NULL || annos->length() <= idnum) { | |
839 return NULL; | |
840 } | |
841 return typeArrayOop(annos->obj_at(idnum)); | |
842 } | |
843 | |
844 // for adding methods | |
845 // UNSET_IDNUM return means no more ids available | |
846 inline u2 instanceKlass::next_method_idnum() { | |
847 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
848 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
849 } else { | |
850 return _idnum_allocated_count++; | |
851 } | |
852 } | |
853 | |
854 | |
855 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass. | |
856 | |
857 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
858 private: | |
859 jushort _offset; // Offset of first oop in oop-map block | |
860 jushort _length; // Length of oop-map block | |
861 public: | |
862 // Accessors | |
863 jushort offset() const { return _offset; } | |
864 void set_offset(jushort offset) { _offset = offset; } | |
865 | |
866 jushort length() const { return _length; } | |
867 void set_length(jushort length) { _length = length; } | |
868 }; | |
869 | |
870 /* JNIid class for jfieldIDs only */ | |
871 class JNIid: public CHeapObj { | |
872 friend class VMStructs; | |
873 private: | |
874 klassOop _holder; | |
875 JNIid* _next; | |
876 int _offset; | |
877 #ifdef ASSERT | |
878 bool _is_static_field_id; | |
879 #endif | |
880 | |
881 public: | |
882 // Accessors | |
883 klassOop holder() const { return _holder; } | |
884 int offset() const { return _offset; } | |
885 JNIid* next() { return _next; } | |
886 // Constructor | |
887 JNIid(klassOop holder, int offset, JNIid* next); | |
888 // Identifier lookup | |
889 JNIid* find(int offset); | |
890 | |
891 // Garbage collection support | |
892 oop* holder_addr() { return (oop*)&_holder; } | |
893 void oops_do(OopClosure* f); | |
894 static void deallocate(JNIid* id); | |
895 // Debugging | |
896 #ifdef ASSERT | |
897 bool is_static_field_id() const { return _is_static_field_id; } | |
898 void set_is_static_field_id() { _is_static_field_id = true; } | |
899 #endif | |
900 void verify(klassOop holder); | |
901 }; | |
902 | |
903 | |
904 // If breakpoints are more numerous than just JVMTI breakpoints, | |
905 // consider compressing this data structure. | |
906 // It is currently a simple linked list defined in methodOop.hpp. | |
907 | |
908 class BreakpointInfo; | |
909 | |
910 | |
911 // A collection point for interesting information about the previous | |
912 // version(s) of an instanceKlass. This class uses weak references to | |
913 // the information so that the information may be collected as needed | |
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914 // by the system. If the information is shared, then a regular |
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915 // reference must be used because a weak reference would be seen as |
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916 // collectible. A GrowableArray of PreviousVersionNodes is attached |
0 | 917 // to the instanceKlass as needed. See PreviousVersionWalker below. |
918 class PreviousVersionNode : public CHeapObj { | |
919 private: | |
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920 // A shared ConstantPool is never collected so we'll always have |
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921 // a reference to it so we can update items in the cache. We'll |
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922 // have a weak reference to a non-shared ConstantPool until all |
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923 // of the methods (EMCP or obsolete) have been collected; the |
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924 // non-shared ConstantPool becomes collectible at that point. |
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925 jobject _prev_constant_pool; // regular or weak reference |
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926 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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927 |
0 | 928 // If the previous version of the instanceKlass doesn't have any |
929 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
930 // EMCP methods have been collected, then _prev_EMCP_methods can | |
931 // have a length of zero. | |
932 GrowableArray<jweak>* _prev_EMCP_methods; | |
933 | |
934 public: | |
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935 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
0 | 936 GrowableArray<jweak>* prev_EMCP_methods); |
937 ~PreviousVersionNode(); | |
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938 jobject prev_constant_pool() const { |
0 | 939 return _prev_constant_pool; |
940 } | |
941 GrowableArray<jweak>* prev_EMCP_methods() const { | |
942 return _prev_EMCP_methods; | |
943 } | |
944 }; | |
945 | |
946 | |
947 // A Handle-ized version of PreviousVersionNode. | |
948 class PreviousVersionInfo : public ResourceObj { | |
949 private: | |
950 constantPoolHandle _prev_constant_pool_handle; | |
951 // If the previous version of the instanceKlass doesn't have any | |
952 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
953 // methods cannot be collected while we hold a handle, | |
954 // _prev_EMCP_methods should never have a length of zero. | |
955 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
956 | |
957 public: | |
958 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
959 ~PreviousVersionInfo(); | |
960 constantPoolHandle prev_constant_pool_handle() const { | |
961 return _prev_constant_pool_handle; | |
962 } | |
963 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
964 return _prev_EMCP_method_handles; | |
965 } | |
966 }; | |
967 | |
968 | |
969 // Helper object for walking previous versions. This helper cleans up | |
970 // the Handles that it allocates when the helper object is destroyed. | |
971 // The PreviousVersionInfo object returned by next_previous_version() | |
972 // is only valid until a subsequent call to next_previous_version() or | |
973 // the helper object is destroyed. | |
974 class PreviousVersionWalker : public StackObj { | |
975 private: | |
976 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
977 int _current_index; | |
978 // Fields for cleaning up when we are done walking the previous versions: | |
979 // A HandleMark for the PreviousVersionInfo handles: | |
980 HandleMark _hm; | |
981 | |
982 // It would be nice to have a ResourceMark field in this helper also, | |
983 // but the ResourceMark code says to be careful to delete handles held | |
984 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
985 // can't guarantee the order in which the fields are destroyed, we | |
986 // have to let the creator of the PreviousVersionWalker object do | |
987 // the right thing. Also, adding a ResourceMark here causes an | |
988 // include loop. | |
989 | |
990 // A pointer to the current info object so we can handle the deletes. | |
991 PreviousVersionInfo * _current_p; | |
992 | |
993 public: | |
994 PreviousVersionWalker(instanceKlass *ik); | |
995 ~PreviousVersionWalker(); | |
996 | |
997 // Return the interesting information for the next previous version | |
998 // of the klass. Returns NULL if there are no more previous versions. | |
999 PreviousVersionInfo* next_previous_version(); | |
1000 }; |