Fri, 10 Jan 2014 12:11:04 -0500
8031059: invokestatic: ICCE trying to invoke static method when it clashes with an abstract method inherited from an interface
Summary: Do not create AME overpass if there is a matching static method
Reviewed-by: lfoltan, coleenp, kamg
1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
26 #define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP
28 #include "memory/allocation.hpp"
29 #include "memory/memRegion.hpp"
30 #include "memory/metaspace.hpp"
31 #include "memory/metaspaceCounters.hpp"
32 #include "runtime/mutex.hpp"
33 #include "utilities/growableArray.hpp"
35 #if INCLUDE_TRACE
36 # include "utilities/ticks.hpp"
37 #endif
39 //
40 // A class loader represents a linkset. Conceptually, a linkset identifies
41 // the complete transitive closure of resolved links that a dynamic linker can
42 // produce.
43 //
44 // A ClassLoaderData also encapsulates the allocation space, called a metaspace,
45 // used by the dynamic linker to allocate the runtime representation of all
46 // the types it defines.
47 //
48 // ClassLoaderData are stored in the runtime representation of classes and the
49 // system dictionary, are roots of garbage collection, and provides iterators
50 // for root tracing and other GC operations.
52 class ClassLoaderData;
53 class JNIMethodBlock;
54 class JNIHandleBlock;
55 class Metadebug;
57 // GC root for walking class loader data created
59 class ClassLoaderDataGraph : public AllStatic {
60 friend class ClassLoaderData;
61 friend class ClassLoaderDataGraphMetaspaceIterator;
62 friend class VMStructs;
63 private:
64 // All CLDs (except the null CLD) can be reached by walking _head->_next->...
65 static ClassLoaderData* _head;
66 static ClassLoaderData* _unloading;
67 // CMS support.
68 static ClassLoaderData* _saved_head;
70 static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS);
71 static void post_class_unload_events(void);
72 public:
73 static ClassLoaderData* find_or_create(Handle class_loader, TRAPS);
74 static void purge();
75 static void clear_claimed_marks();
76 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
77 static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
78 static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
79 static void classes_do(KlassClosure* klass_closure);
80 static void classes_do(void f(Klass* const));
81 static void loaded_classes_do(KlassClosure* klass_closure);
82 static void classes_unloading_do(void f(Klass* const));
83 static bool do_unloading(BoolObjectClosure* is_alive);
85 // CMS support.
86 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
87 static GrowableArray<ClassLoaderData*>* new_clds();
89 static void dump_on(outputStream * const out) PRODUCT_RETURN;
90 static void dump() { dump_on(tty); }
91 static void verify();
93 #ifndef PRODUCT
94 // expensive test for pointer in metaspace for debugging
95 static bool contains(address x);
96 static bool contains_loader_data(ClassLoaderData* loader_data);
97 #endif
99 #if INCLUDE_TRACE
100 private:
101 static Ticks _class_unload_time;
102 static void class_unload_event(Klass* const k);
103 #endif
104 };
106 // ClassLoaderData class
108 class ClassLoaderData : public CHeapObj<mtClass> {
109 friend class VMStructs;
110 private:
111 class Dependencies VALUE_OBJ_CLASS_SPEC {
112 objArrayOop _list_head;
113 void locked_add(objArrayHandle last,
114 objArrayHandle new_dependency,
115 Thread* THREAD);
116 public:
117 Dependencies() : _list_head(NULL) {}
118 Dependencies(TRAPS) : _list_head(NULL) {
119 init(CHECK);
120 }
121 void add(Handle dependency, TRAPS);
122 void init(TRAPS);
123 void oops_do(OopClosure* f);
124 };
126 friend class ClassLoaderDataGraph;
127 friend class ClassLoaderDataGraphMetaspaceIterator;
128 friend class MetaDataFactory;
129 friend class Method;
131 static ClassLoaderData * _the_null_class_loader_data;
133 oop _class_loader; // oop used to uniquely identify a class loader
134 // class loader or a canonical class path
135 Dependencies _dependencies; // holds dependencies from this class loader
136 // data to others.
138 Metaspace * _metaspace; // Meta-space where meta-data defined by the
139 // classes in the class loader are allocated.
140 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup.
141 bool _unloading; // true if this class loader goes away
142 bool _keep_alive; // if this CLD can be unloaded for anonymous loaders
143 bool _is_anonymous; // if this CLD is for an anonymous class
144 volatile int _claimed; // true if claimed, for example during GC traces.
145 // To avoid applying oop closure more than once.
146 // Has to be an int because we cas it.
147 Klass* _klasses; // The classes defined by the class loader.
149 JNIHandleBlock* _handles; // Handles to constant pool arrays
151 // These method IDs are created for the class loader and set to NULL when the
152 // class loader is unloaded. They are rarely freed, only for redefine classes
153 // and if they lose a data race in InstanceKlass.
154 JNIMethodBlock* _jmethod_ids;
156 // Metadata to be deallocated when it's safe at class unloading, when
157 // this class loader isn't unloaded itself.
158 GrowableArray<Metadata*>* _deallocate_list;
160 // Support for walking class loader data objects
161 ClassLoaderData* _next; /// Next loader_datas created
163 // ReadOnly and ReadWrite metaspaces (static because only on the null
164 // class loader for now).
165 static Metaspace* _ro_metaspace;
166 static Metaspace* _rw_metaspace;
168 void set_next(ClassLoaderData* next) { _next = next; }
169 ClassLoaderData* next() const { return _next; }
171 ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies);
172 ~ClassLoaderData();
174 void set_metaspace(Metaspace* m) { _metaspace = m; }
176 JNIHandleBlock* handles() const;
177 void set_handles(JNIHandleBlock* handles);
179 Mutex* metaspace_lock() const { return _metaspace_lock; }
181 // GC interface.
182 void clear_claimed() { _claimed = 0; }
183 bool claimed() const { return _claimed == 1; }
184 bool claim();
186 void unload();
187 bool keep_alive() const { return _keep_alive; }
188 bool is_alive(BoolObjectClosure* is_alive_closure) const;
189 void classes_do(void f(Klass*));
190 void loaded_classes_do(KlassClosure* klass_closure);
191 void classes_do(void f(InstanceKlass*));
193 // Deallocate free list during class unloading.
194 void free_deallocate_list();
196 // Allocate out of this class loader data
197 MetaWord* allocate(size_t size);
199 public:
200 // Accessors
201 Metaspace* metaspace_or_null() const { return _metaspace; }
203 static ClassLoaderData* the_null_class_loader_data() {
204 return _the_null_class_loader_data;
205 }
207 bool is_anonymous() const { return _is_anonymous; }
209 static void init_null_class_loader_data() {
210 assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
211 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
213 // We explicitly initialize the Dependencies object at a later phase in the initialization
214 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies());
215 ClassLoaderDataGraph::_head = _the_null_class_loader_data;
216 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be");
217 if (DumpSharedSpaces) {
218 _the_null_class_loader_data->initialize_shared_metaspaces();
219 }
220 }
222 bool is_the_null_class_loader_data() const {
223 return this == _the_null_class_loader_data;
224 }
225 bool is_ext_class_loader_data() const;
227 // The Metaspace is created lazily so may be NULL. This
228 // method will allocate a Metaspace if needed.
229 Metaspace* metaspace_non_null();
231 oop class_loader() const { return _class_loader; }
233 // Returns true if this class loader data is for a loader going away.
234 bool is_unloading() const {
235 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
236 return _unloading;
237 }
238 // Anonymous class loader data doesn't have anything to keep them from
239 // being unloaded during parsing the anonymous class.
240 void set_keep_alive(bool value) { _keep_alive = value; }
242 unsigned int identity_hash() {
243 return _class_loader == NULL ? 0 : _class_loader->identity_hash();
244 }
246 // Used when tracing from klasses.
247 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
249 void classes_do(KlassClosure* klass_closure);
251 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
252 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
254 void print_value() { print_value_on(tty); }
255 void print_value_on(outputStream* out) const;
256 void dump(outputStream * const out) PRODUCT_RETURN;
257 void verify();
258 const char* loader_name();
260 jobject add_handle(Handle h);
261 void add_class(Klass* k);
262 void remove_class(Klass* k);
263 void record_dependency(Klass* to, TRAPS);
264 void init_dependencies(TRAPS);
266 void add_to_deallocate_list(Metadata* m);
268 static ClassLoaderData* class_loader_data(oop loader);
269 static ClassLoaderData* class_loader_data_or_null(oop loader);
270 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS);
271 static void print_loader(ClassLoaderData *loader_data, outputStream *out);
273 // CDS support
274 Metaspace* ro_metaspace();
275 Metaspace* rw_metaspace();
276 void initialize_shared_metaspaces();
277 };
279 class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
280 ClassLoaderData* _data;
281 public:
282 ClassLoaderDataGraphMetaspaceIterator();
283 ~ClassLoaderDataGraphMetaspaceIterator();
284 bool repeat() { return _data != NULL; }
285 Metaspace* get_next() {
286 assert(_data != NULL, "Should not be NULL in call to the iterator");
287 Metaspace* result = _data->metaspace_or_null();
288 _data = _data->next();
289 // This result might be NULL for class loaders without metaspace
290 // yet. It would be nice to return only non-null results but
291 // there is no guarantee that there will be a non-null result
292 // down the list so the caller is going to have to check.
293 return result;
294 }
295 };
296 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP