Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klassVtable.hpp @ 1649:a528509c992b
6968336: VM crash guarantee(!nm->is_zombie()) failed: cannot lock a zombie method
Reviewed-by: twisti
author | never |
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date | Thu, 15 Jul 2010 08:54:48 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
25 // A klassVtable abstracts the variable-length vtable that is embedded in instanceKlass | |
26 // and arrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, | |
27 // not to actually hold the vtable data. | |
28 // Note: the klassVtable should not be accessed before the class has been verified | |
29 // (until that point, the vtable is uninitialized). | |
30 | |
31 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore | |
32 // not preserved across GCs. | |
33 | |
34 class vtableEntry; | |
35 | |
36 class klassVtable : public ResourceObj { | |
37 KlassHandle _klass; // my klass | |
38 int _tableOffset; // offset of start of vtable data within klass | |
39 int _length; // length of vtable (number of entries) | |
40 #ifndef PRODUCT | |
41 int _verify_count; // to make verify faster | |
42 #endif | |
43 | |
44 // Ordering important, so greater_than (>) can be used as an merge operator. | |
45 enum AccessType { | |
46 acc_private = 0, | |
47 acc_package_private = 1, | |
48 acc_publicprotected = 2 | |
49 }; | |
50 | |
51 public: | |
52 klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) { | |
53 _tableOffset = (address)base - (address)h_klass(); _length = length; | |
54 } | |
55 | |
56 // accessors | |
57 vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); } | |
58 KlassHandle klass() const { return _klass; } | |
59 int length() const { return _length; } | |
60 inline methodOop method_at(int i) const; | |
61 inline methodOop unchecked_method_at(int i) const; | |
62 inline oop* adr_method_at(int i) const; | |
63 | |
64 // searching; all methods return -1 if not found | |
65 int index_of(methodOop m) const { return index_of(m, _length); } | |
66 int index_of_miranda(symbolOop name, symbolOop signature); | |
67 | |
68 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass | |
69 | |
70 // conputes vtable length (in words) and the number of miranda methods | |
71 static void compute_vtable_size_and_num_mirandas(int &vtable_length, int &num_miranda_methods, | |
72 klassOop super, objArrayOop methods, | |
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73 AccessFlags class_flags, Handle classloader, |
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74 symbolHandle classname, objArrayOop local_interfaces, |
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75 TRAPS); |
0 | 76 |
77 // RedefineClasses() API support: | |
78 // If any entry of this vtable points to any of old_methods, | |
79 // replace it with the corresponding new_method. | |
80 // trace_name_printed is set to true if the current call has | |
81 // printed the klass name so that other routines in the adjust_* | |
82 // group don't print the klass name. | |
83 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
84 int methods_length, bool * trace_name_printed); | |
85 | |
86 // Garbage collection | |
87 void oop_follow_contents(); | |
88 void oop_adjust_pointers(); | |
89 | |
90 #ifndef SERIALGC | |
91 // Parallel Old | |
92 void oop_follow_contents(ParCompactionManager* cm); | |
93 void oop_update_pointers(ParCompactionManager* cm); | |
94 void oop_update_pointers(ParCompactionManager* cm, | |
95 HeapWord* beg_addr, HeapWord* end_addr); | |
96 #endif // SERIALGC | |
97 | |
98 // Iterators | |
99 void oop_oop_iterate(OopClosure* blk); | |
100 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); | |
101 | |
102 // Debugging code | |
103 void print() PRODUCT_RETURN; | |
104 void verify(outputStream* st, bool force = false); | |
105 static void print_statistics() PRODUCT_RETURN; | |
106 | |
107 #ifndef PRODUCT | |
108 bool check_no_old_entries(); | |
109 void dump_vtable(); | |
110 #endif | |
111 | |
112 protected: | |
113 friend class vtableEntry; | |
114 private: | |
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115 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ; |
0 | 116 void copy_vtable_to(vtableEntry* start); |
117 int initialize_from_super(KlassHandle super); | |
118 int index_of(methodOop m, int len) const; // same as index_of, but search only up to len | |
119 void put_method_at(methodOop m, int index); | |
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120 static bool needs_new_vtable_entry(methodHandle m, klassOop super, Handle classloader, symbolHandle classname, AccessFlags access_flags, TRAPS); |
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122 bool update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS); |
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123 instanceKlass* find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, int vtable_index, |
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124 Handle target_loader, symbolHandle target_classname, Thread* THREAD); |
0 | 125 |
126 // support for miranda methods | |
127 bool is_miranda_entry_at(int i); | |
128 void fill_in_mirandas(int& initialized); | |
129 static bool is_miranda(methodOop m, objArrayOop class_methods, klassOop super); | |
130 static void add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, objArrayOop current_interface_methods, objArrayOop class_methods, klassOop super); | |
131 static void get_mirandas(GrowableArray<methodOop>* mirandas, klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); | |
132 static int get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); | |
133 | |
134 | |
135 void verify_against(outputStream* st, klassVtable* vt, int index); | |
136 inline instanceKlass* ik() const; | |
137 }; | |
138 | |
139 | |
140 // private helper class for klassVtable | |
141 // description of entry points: | |
142 // destination is interpreted: | |
143 // from_compiled_code_entry_point -> c2iadapter | |
144 // from_interpreter_entry_point -> interpreter entry point | |
145 // destination is compiled: | |
146 // from_compiled_code_entry_point -> nmethod entry point | |
147 // from_interpreter_entry_point -> i2cadapter | |
148 class vtableEntry VALUE_OBJ_CLASS_SPEC { | |
149 public: | |
150 // size in words | |
151 static int size() { | |
152 return sizeof(vtableEntry) / sizeof(HeapWord); | |
153 } | |
154 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } | |
155 methodOop method() const { return _method; } | |
156 | |
157 private: | |
158 methodOop _method; | |
159 void set(methodOop method) { assert(method != NULL, "use clear"); _method = method; } | |
160 void clear() { _method = NULL; } | |
161 void print() PRODUCT_RETURN; | |
162 void verify(klassVtable* vt, outputStream* st); | |
163 | |
164 friend class klassVtable; | |
165 }; | |
166 | |
167 | |
168 inline methodOop klassVtable::method_at(int i) const { | |
169 assert(i >= 0 && i < _length, "index out of bounds"); | |
170 assert(table()[i].method() != NULL, "should not be null"); | |
171 assert(oop(table()[i].method())->is_method(), "should be method"); | |
172 return table()[i].method(); | |
173 } | |
174 | |
175 inline methodOop klassVtable::unchecked_method_at(int i) const { | |
176 assert(i >= 0 && i < _length, "index out of bounds"); | |
177 return table()[i].method(); | |
178 } | |
179 | |
180 inline oop* klassVtable::adr_method_at(int i) const { | |
181 // Allow one past the last entry to be referenced; useful for loop bounds. | |
182 assert(i >= 0 && i <= _length, "index out of bounds"); | |
183 return (oop*)(address(table() + i) + vtableEntry::method_offset_in_bytes()); | |
184 } | |
185 | |
186 // -------------------------------------------------------------------------------- | |
187 class klassItable; | |
188 class itableMethodEntry; | |
189 | |
190 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
191 private: | |
192 klassOop _interface; | |
193 int _offset; | |
194 public: | |
195 klassOop interface_klass() const { return _interface; } | |
196 int offset() const { return _offset; } | |
197 | |
198 static itableMethodEntry* method_entry(klassOop k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } | |
199 itableMethodEntry* first_method_entry(klassOop k) { return method_entry(k, _offset); } | |
200 | |
201 void initialize(klassOop interf, int offset) { _interface = interf; _offset = offset; } | |
202 | |
203 // Static size and offset accessors | |
204 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words | |
205 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } | |
206 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } | |
207 | |
208 friend class klassItable; | |
209 }; | |
210 | |
211 | |
212 class itableMethodEntry VALUE_OBJ_CLASS_SPEC { | |
213 private: | |
214 methodOop _method; | |
215 | |
216 public: | |
217 methodOop method() const { return _method; } | |
218 | |
219 void clear() { _method = NULL; } | |
220 | |
221 void initialize(methodOop method); | |
222 | |
223 // Static size and offset accessors | |
224 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words | |
225 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } | |
226 | |
227 friend class klassItable; | |
228 }; | |
229 | |
230 // | |
231 // Format of an itable | |
232 // | |
233 // ---- offset table --- | |
234 // klassOop of interface 1 \ | |
235 // offset to vtable from start of oop / offset table entry | |
236 // ... | |
237 // klassOop of interface n \ | |
238 // offset to vtable from start of oop / offset table entry | |
239 // --- vtable for interface 1 --- | |
240 // methodOop \ | |
241 // compiler entry point / method table entry | |
242 // ... | |
243 // methodOop \ | |
244 // compiler entry point / method table entry | |
245 // -- vtable for interface 2 --- | |
246 // ... | |
247 // | |
248 class klassItable : public ResourceObj { | |
249 private: | |
250 instanceKlassHandle _klass; // my klass | |
251 int _table_offset; // offset of start of itable data within klass (in words) | |
252 int _size_offset_table; // size of offset table (in itableOffset entries) | |
253 int _size_method_table; // size of methodtable (in itableMethodEntry entries) | |
254 | |
255 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); | |
256 public: | |
257 klassItable(instanceKlassHandle klass); | |
258 | |
259 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); | |
260 return &((itableOffsetEntry*)vtable_start())[i]; } | |
261 | |
262 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); | |
263 return &((itableMethodEntry*)method_start())[i]; } | |
264 | |
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265 int size_offset_table() { return _size_offset_table; } |
0 | 266 |
267 // Initialization | |
268 void initialize_itable(bool checkconstraints, TRAPS); | |
269 | |
270 // Updates | |
271 void initialize_with_method(methodOop m); | |
272 | |
273 // RedefineClasses() API support: | |
274 // if any entry of this itable points to any of old_methods, | |
275 // replace it with the corresponding new_method. | |
276 // trace_name_printed is set to true if the current call has | |
277 // printed the klass name so that other routines in the adjust_* | |
278 // group don't print the klass name. | |
279 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
280 int methods_length, bool * trace_name_printed); | |
281 | |
282 // Garbage collection | |
283 void oop_follow_contents(); | |
284 void oop_adjust_pointers(); | |
285 | |
286 #ifndef SERIALGC | |
287 // Parallel Old | |
288 void oop_follow_contents(ParCompactionManager* cm); | |
289 void oop_update_pointers(ParCompactionManager* cm); | |
290 void oop_update_pointers(ParCompactionManager* cm, | |
291 HeapWord* beg_addr, HeapWord* end_addr); | |
292 #endif // SERIALGC | |
293 | |
294 // Iterators | |
295 void oop_oop_iterate(OopClosure* blk); | |
296 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); | |
297 | |
298 // Setup of itable | |
299 static int compute_itable_size(objArrayHandle transitive_interfaces); | |
300 static void setup_itable_offset_table(instanceKlassHandle klass); | |
301 | |
302 // Resolving of method to index | |
303 static int compute_itable_index(methodOop m); | |
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304 // ...and back again: |
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305 static methodOop method_for_itable_index(klassOop klass, int itable_index); |
0 | 306 |
307 // Debugging/Statistics | |
308 static void print_statistics() PRODUCT_RETURN; | |
309 private: | |
310 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
311 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
312 | |
313 // Helper methods | |
314 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
315 | |
316 // Statistics | |
317 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
318 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
319 | |
320 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
321 }; |