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comparison src/share/vm/oops/klassVtable.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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 // 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,
73 AccessFlags class_flags, oop classloader,
74 symbolOop classname, objArrayOop local_interfaces);
75
76 // RedefineClasses() API support:
77 // If any entry of this vtable points to any of old_methods,
78 // replace it with the corresponding new_method.
79 // trace_name_printed is set to true if the current call has
80 // printed the klass name so that other routines in the adjust_*
81 // group don't print the klass name.
82 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
83 int methods_length, bool * trace_name_printed);
84
85 // Garbage collection
86 void oop_follow_contents();
87 void oop_adjust_pointers();
88
89 #ifndef SERIALGC
90 // Parallel Old
91 void oop_follow_contents(ParCompactionManager* cm);
92 void oop_update_pointers(ParCompactionManager* cm);
93 void oop_update_pointers(ParCompactionManager* cm,
94 HeapWord* beg_addr, HeapWord* end_addr);
95 #endif // SERIALGC
96
97 // Iterators
98 void oop_oop_iterate(OopClosure* blk);
99 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr);
100
101 // Debugging code
102 void print() PRODUCT_RETURN;
103 void verify(outputStream* st, bool force = false);
104 static void print_statistics() PRODUCT_RETURN;
105
106 #ifndef PRODUCT
107 bool check_no_old_entries();
108 void dump_vtable();
109 #endif
110
111 protected:
112 friend class vtableEntry;
113 private:
114 void copy_vtable_to(vtableEntry* start);
115 int initialize_from_super(KlassHandle super);
116 int index_of(methodOop m, int len) const; // same as index_of, but search only up to len
117 void put_method_at(methodOop m, int index);
118 static bool needs_new_vtable_entry(methodOop m, klassOop super, oop classloader, symbolOop classname, AccessFlags access_flags);
119 AccessType vtable_accessibility_at(int i);
120
121 bool update_super_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS);
122
123 // support for miranda methods
124 bool is_miranda_entry_at(int i);
125 void fill_in_mirandas(int& initialized);
126 static bool is_miranda(methodOop m, objArrayOop class_methods, klassOop super);
127 static void add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, objArrayOop current_interface_methods, objArrayOop class_methods, klassOop super);
128 static void get_mirandas(GrowableArray<methodOop>* mirandas, klassOop super, objArrayOop class_methods, objArrayOop local_interfaces);
129 static int get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces);
130
131
132 void verify_against(outputStream* st, klassVtable* vt, int index);
133 inline instanceKlass* ik() const;
134 };
135
136
137 // private helper class for klassVtable
138 // description of entry points:
139 // destination is interpreted:
140 // from_compiled_code_entry_point -> c2iadapter
141 // from_interpreter_entry_point -> interpreter entry point
142 // destination is compiled:
143 // from_compiled_code_entry_point -> nmethod entry point
144 // from_interpreter_entry_point -> i2cadapter
145 class vtableEntry VALUE_OBJ_CLASS_SPEC {
146 public:
147 // size in words
148 static int size() {
149 return sizeof(vtableEntry) / sizeof(HeapWord);
150 }
151 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); }
152 methodOop method() const { return _method; }
153
154 private:
155 methodOop _method;
156 void set(methodOop method) { assert(method != NULL, "use clear"); _method = method; }
157 void clear() { _method = NULL; }
158 void print() PRODUCT_RETURN;
159 void verify(klassVtable* vt, outputStream* st);
160
161 friend class klassVtable;
162 };
163
164
165 inline methodOop klassVtable::method_at(int i) const {
166 assert(i >= 0 && i < _length, "index out of bounds");
167 assert(table()[i].method() != NULL, "should not be null");
168 assert(oop(table()[i].method())->is_method(), "should be method");
169 return table()[i].method();
170 }
171
172 inline methodOop klassVtable::unchecked_method_at(int i) const {
173 assert(i >= 0 && i < _length, "index out of bounds");
174 return table()[i].method();
175 }
176
177 inline oop* klassVtable::adr_method_at(int i) const {
178 // Allow one past the last entry to be referenced; useful for loop bounds.
179 assert(i >= 0 && i <= _length, "index out of bounds");
180 return (oop*)(address(table() + i) + vtableEntry::method_offset_in_bytes());
181 }
182
183 // --------------------------------------------------------------------------------
184 class klassItable;
185 class itableMethodEntry;
186
187 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC {
188 private:
189 klassOop _interface;
190 int _offset;
191 public:
192 klassOop interface_klass() const { return _interface; }
193 int offset() const { return _offset; }
194
195 static itableMethodEntry* method_entry(klassOop k, int offset) { return (itableMethodEntry*)(((address)k) + offset); }
196 itableMethodEntry* first_method_entry(klassOop k) { return method_entry(k, _offset); }
197
198 void initialize(klassOop interf, int offset) { _interface = interf; _offset = offset; }
199
200 // Static size and offset accessors
201 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words
202 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); }
203 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); }
204
205 friend class klassItable;
206 };
207
208
209 class itableMethodEntry VALUE_OBJ_CLASS_SPEC {
210 private:
211 methodOop _method;
212
213 public:
214 methodOop method() const { return _method; }
215
216 void clear() { _method = NULL; }
217
218 void initialize(methodOop method);
219
220 // Static size and offset accessors
221 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words
222 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); }
223
224 friend class klassItable;
225 };
226
227 //
228 // Format of an itable
229 //
230 // ---- offset table ---
231 // klassOop of interface 1 \
232 // offset to vtable from start of oop / offset table entry
233 // ...
234 // klassOop of interface n \
235 // offset to vtable from start of oop / offset table entry
236 // --- vtable for interface 1 ---
237 // methodOop \
238 // compiler entry point / method table entry
239 // ...
240 // methodOop \
241 // compiler entry point / method table entry
242 // -- vtable for interface 2 ---
243 // ...
244 //
245 class klassItable : public ResourceObj {
246 private:
247 instanceKlassHandle _klass; // my klass
248 int _table_offset; // offset of start of itable data within klass (in words)
249 int _size_offset_table; // size of offset table (in itableOffset entries)
250 int _size_method_table; // size of methodtable (in itableMethodEntry entries)
251
252 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS);
253 public:
254 klassItable(instanceKlassHandle klass);
255
256 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
257 return &((itableOffsetEntry*)vtable_start())[i]; }
258
259 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
260 return &((itableMethodEntry*)method_start())[i]; }
261
262 int nof_interfaces() { return _size_offset_table; }
263
264 // Initialization
265 void initialize_itable(bool checkconstraints, TRAPS);
266
267 // Updates
268 void initialize_with_method(methodOop m);
269
270 // RedefineClasses() API support:
271 // if any entry of this itable points to any of old_methods,
272 // replace it with the corresponding new_method.
273 // trace_name_printed is set to true if the current call has
274 // printed the klass name so that other routines in the adjust_*
275 // group don't print the klass name.
276 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
277 int methods_length, bool * trace_name_printed);
278
279 // Garbage collection
280 void oop_follow_contents();
281 void oop_adjust_pointers();
282
283 #ifndef SERIALGC
284 // Parallel Old
285 void oop_follow_contents(ParCompactionManager* cm);
286 void oop_update_pointers(ParCompactionManager* cm);
287 void oop_update_pointers(ParCompactionManager* cm,
288 HeapWord* beg_addr, HeapWord* end_addr);
289 #endif // SERIALGC
290
291 // Iterators
292 void oop_oop_iterate(OopClosure* blk);
293 void oop_oop_iterate_m(OopClosure* blk, MemRegion mr);
294
295 // Setup of itable
296 static int compute_itable_size(objArrayHandle transitive_interfaces);
297 static void setup_itable_offset_table(instanceKlassHandle klass);
298
299 // Resolving of method to index
300 static int compute_itable_index(methodOop m);
301
302 // Debugging/Statistics
303 static void print_statistics() PRODUCT_RETURN;
304 private:
305 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; }
306 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
307
308 // Helper methods
309 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
310
311 // Statistics
312 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables
313 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables
314
315 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
316 };