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annotate src/share/vm/oops/klassVtable.hpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | 8ce625481709 |
children | da91efe96a93 |
rev | line source |
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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_KLASSVTABLE_HPP |
26 #define SHARE_VM_OOPS_KLASSVTABLE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "oops/oopsHierarchy.hpp" | |
30 #include "runtime/handles.hpp" | |
31 #include "utilities/growableArray.hpp" | |
32 | |
0 | 33 // A klassVtable abstracts the variable-length vtable that is embedded in instanceKlass |
34 // and arrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, | |
35 // not to actually hold the vtable data. | |
36 // Note: the klassVtable should not be accessed before the class has been verified | |
37 // (until that point, the vtable is uninitialized). | |
38 | |
39 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore | |
40 // not preserved across GCs. | |
41 | |
42 class vtableEntry; | |
43 | |
44 class klassVtable : public ResourceObj { | |
45 KlassHandle _klass; // my klass | |
46 int _tableOffset; // offset of start of vtable data within klass | |
47 int _length; // length of vtable (number of entries) | |
48 #ifndef PRODUCT | |
49 int _verify_count; // to make verify faster | |
50 #endif | |
51 | |
52 // Ordering important, so greater_than (>) can be used as an merge operator. | |
53 enum AccessType { | |
54 acc_private = 0, | |
55 acc_package_private = 1, | |
56 acc_publicprotected = 2 | |
57 }; | |
58 | |
59 public: | |
60 klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) { | |
61 _tableOffset = (address)base - (address)h_klass(); _length = length; | |
62 } | |
63 | |
64 // accessors | |
65 vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); } | |
66 KlassHandle klass() const { return _klass; } | |
67 int length() const { return _length; } | |
68 inline methodOop method_at(int i) const; | |
69 inline methodOop unchecked_method_at(int i) const; | |
70 inline oop* adr_method_at(int i) const; | |
71 | |
72 // searching; all methods return -1 if not found | |
73 int index_of(methodOop m) const { return index_of(m, _length); } | |
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74 int index_of_miranda(Symbol* name, Symbol* signature); |
0 | 75 |
76 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass | |
77 | |
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78 // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
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79 // at dump time. Clearing gives us an easy way to tell if the vtable has |
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80 // already been reinitialized at dump time (see dump.cpp). Vtables can |
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81 // be initialized at run time by RedefineClasses so dumping the right order |
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82 // is necessary. |
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83 void clear_vtable(); |
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84 bool is_initialized(); |
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85 |
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86 // computes vtable length (in words) and the number of miranda methods |
0 | 87 static void compute_vtable_size_and_num_mirandas(int &vtable_length, int &num_miranda_methods, |
88 klassOop super, objArrayOop methods, | |
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89 AccessFlags class_flags, Handle classloader, |
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90 Symbol* classname, objArrayOop local_interfaces, |
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91 TRAPS); |
0 | 92 |
93 // RedefineClasses() API support: | |
94 // If any entry of this vtable points to any of old_methods, | |
95 // replace it with the corresponding new_method. | |
96 // trace_name_printed is set to true if the current call has | |
97 // printed the klass name so that other routines in the adjust_* | |
98 // group don't print the klass name. | |
99 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
100 int methods_length, bool * trace_name_printed); | |
101 | |
102 // Garbage collection | |
103 void oop_follow_contents(); | |
104 void oop_adjust_pointers(); | |
105 | |
106 #ifndef SERIALGC | |
107 // Parallel Old | |
108 void oop_follow_contents(ParCompactionManager* cm); | |
109 void oop_update_pointers(ParCompactionManager* cm); | |
110 #endif // SERIALGC | |
111 | |
112 // Iterators | |
113 void oop_oop_iterate(OopClosure* blk); | |
114 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); | |
115 | |
116 // Debugging code | |
117 void print() PRODUCT_RETURN; | |
118 void verify(outputStream* st, bool force = false); | |
119 static void print_statistics() PRODUCT_RETURN; | |
120 | |
121 #ifndef PRODUCT | |
122 bool check_no_old_entries(); | |
123 void dump_vtable(); | |
124 #endif | |
125 | |
126 protected: | |
127 friend class vtableEntry; | |
128 private: | |
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129 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ; |
0 | 130 void copy_vtable_to(vtableEntry* start); |
131 int initialize_from_super(KlassHandle super); | |
132 int index_of(methodOop m, int len) const; // same as index_of, but search only up to len | |
133 void put_method_at(methodOop m, int index); | |
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134 static bool needs_new_vtable_entry(methodHandle m, klassOop super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS); |
0 | 135 |
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136 bool update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS); |
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137 instanceKlass* find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, int vtable_index, |
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138 Handle target_loader, Symbol* target_classname, Thread* THREAD); |
0 | 139 |
140 // support for miranda methods | |
141 bool is_miranda_entry_at(int i); | |
142 void fill_in_mirandas(int& initialized); | |
143 static bool is_miranda(methodOop m, objArrayOop class_methods, klassOop super); | |
144 static void add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, objArrayOop current_interface_methods, objArrayOop class_methods, klassOop super); | |
145 static void get_mirandas(GrowableArray<methodOop>* mirandas, klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); | |
146 static int get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); | |
147 | |
148 | |
149 void verify_against(outputStream* st, klassVtable* vt, int index); | |
150 inline instanceKlass* ik() const; | |
151 }; | |
152 | |
153 | |
154 // private helper class for klassVtable | |
155 // description of entry points: | |
156 // destination is interpreted: | |
157 // from_compiled_code_entry_point -> c2iadapter | |
158 // from_interpreter_entry_point -> interpreter entry point | |
159 // destination is compiled: | |
160 // from_compiled_code_entry_point -> nmethod entry point | |
161 // from_interpreter_entry_point -> i2cadapter | |
162 class vtableEntry VALUE_OBJ_CLASS_SPEC { | |
163 public: | |
164 // size in words | |
165 static int size() { | |
166 return sizeof(vtableEntry) / sizeof(HeapWord); | |
167 } | |
168 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } | |
169 methodOop method() const { return _method; } | |
170 | |
171 private: | |
172 methodOop _method; | |
173 void set(methodOop method) { assert(method != NULL, "use clear"); _method = method; } | |
174 void clear() { _method = NULL; } | |
175 void print() PRODUCT_RETURN; | |
176 void verify(klassVtable* vt, outputStream* st); | |
177 | |
178 friend class klassVtable; | |
179 }; | |
180 | |
181 | |
182 inline methodOop klassVtable::method_at(int i) const { | |
183 assert(i >= 0 && i < _length, "index out of bounds"); | |
184 assert(table()[i].method() != NULL, "should not be null"); | |
185 assert(oop(table()[i].method())->is_method(), "should be method"); | |
186 return table()[i].method(); | |
187 } | |
188 | |
189 inline methodOop klassVtable::unchecked_method_at(int i) const { | |
190 assert(i >= 0 && i < _length, "index out of bounds"); | |
191 return table()[i].method(); | |
192 } | |
193 | |
194 inline oop* klassVtable::adr_method_at(int i) const { | |
195 // Allow one past the last entry to be referenced; useful for loop bounds. | |
196 assert(i >= 0 && i <= _length, "index out of bounds"); | |
197 return (oop*)(address(table() + i) + vtableEntry::method_offset_in_bytes()); | |
198 } | |
199 | |
200 // -------------------------------------------------------------------------------- | |
201 class klassItable; | |
202 class itableMethodEntry; | |
203 | |
204 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
205 private: | |
206 klassOop _interface; | |
207 int _offset; | |
208 public: | |
209 klassOop interface_klass() const { return _interface; } | |
210 int offset() const { return _offset; } | |
211 | |
212 static itableMethodEntry* method_entry(klassOop k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } | |
213 itableMethodEntry* first_method_entry(klassOop k) { return method_entry(k, _offset); } | |
214 | |
215 void initialize(klassOop interf, int offset) { _interface = interf; _offset = offset; } | |
216 | |
217 // Static size and offset accessors | |
218 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words | |
219 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } | |
220 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } | |
221 | |
222 friend class klassItable; | |
223 }; | |
224 | |
225 | |
226 class itableMethodEntry VALUE_OBJ_CLASS_SPEC { | |
227 private: | |
228 methodOop _method; | |
229 | |
230 public: | |
231 methodOop method() const { return _method; } | |
232 | |
233 void clear() { _method = NULL; } | |
234 | |
235 void initialize(methodOop method); | |
236 | |
237 // Static size and offset accessors | |
238 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words | |
239 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } | |
240 | |
241 friend class klassItable; | |
242 }; | |
243 | |
244 // | |
245 // Format of an itable | |
246 // | |
247 // ---- offset table --- | |
248 // klassOop of interface 1 \ | |
249 // offset to vtable from start of oop / offset table entry | |
250 // ... | |
251 // klassOop of interface n \ | |
252 // offset to vtable from start of oop / offset table entry | |
253 // --- vtable for interface 1 --- | |
254 // methodOop \ | |
255 // compiler entry point / method table entry | |
256 // ... | |
257 // methodOop \ | |
258 // compiler entry point / method table entry | |
259 // -- vtable for interface 2 --- | |
260 // ... | |
261 // | |
262 class klassItable : public ResourceObj { | |
263 private: | |
264 instanceKlassHandle _klass; // my klass | |
265 int _table_offset; // offset of start of itable data within klass (in words) | |
266 int _size_offset_table; // size of offset table (in itableOffset entries) | |
267 int _size_method_table; // size of methodtable (in itableMethodEntry entries) | |
268 | |
269 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); | |
270 public: | |
271 klassItable(instanceKlassHandle klass); | |
272 | |
273 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); | |
274 return &((itableOffsetEntry*)vtable_start())[i]; } | |
275 | |
276 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); | |
277 return &((itableMethodEntry*)method_start())[i]; } | |
278 | |
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279 int size_offset_table() { return _size_offset_table; } |
0 | 280 |
281 // Initialization | |
282 void initialize_itable(bool checkconstraints, TRAPS); | |
283 | |
284 // Updates | |
285 void initialize_with_method(methodOop m); | |
286 | |
287 // RedefineClasses() API support: | |
288 // if any entry of this itable points to any of old_methods, | |
289 // replace it with the corresponding new_method. | |
290 // trace_name_printed is set to true if the current call has | |
291 // printed the klass name so that other routines in the adjust_* | |
292 // group don't print the klass name. | |
293 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
294 int methods_length, bool * trace_name_printed); | |
295 | |
296 // Garbage collection | |
297 void oop_follow_contents(); | |
298 void oop_adjust_pointers(); | |
299 | |
300 #ifndef SERIALGC | |
301 // Parallel Old | |
302 void oop_follow_contents(ParCompactionManager* cm); | |
303 void oop_update_pointers(ParCompactionManager* cm); | |
304 #endif // SERIALGC | |
305 | |
306 // Iterators | |
307 void oop_oop_iterate(OopClosure* blk); | |
308 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); | |
309 | |
310 // Setup of itable | |
311 static int compute_itable_size(objArrayHandle transitive_interfaces); | |
312 static void setup_itable_offset_table(instanceKlassHandle klass); | |
313 | |
314 // Resolving of method to index | |
315 static int compute_itable_index(methodOop m); | |
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316 // ...and back again: |
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317 static methodOop method_for_itable_index(klassOop klass, int itable_index); |
0 | 318 |
319 // Debugging/Statistics | |
320 static void print_statistics() PRODUCT_RETURN; | |
321 private: | |
322 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
323 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
324 | |
325 // Helper methods | |
326 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
327 | |
328 // Statistics | |
329 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
330 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
331 | |
332 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
333 }; | |
1972 | 334 |
335 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |