Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klassVtable.hpp @ 7168:73e64867adb7
8003690: Example code in JVMTI GetStackTrace documentation is broken
Summary: Fixed to minor errors in example code
Reviewed-by: sspitsyn, dholmes
author | mikael |
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date | Wed, 21 Nov 2012 09:02:13 -0800 |
parents | 4735d2c84362 |
children | 8d9fc28831cc |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 | |
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33 // A klassVtable abstracts the variable-length vtable that is embedded in InstanceKlass |
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34 // and ArrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, |
0 | 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; } | |
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68 inline Method* method_at(int i) const; |
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69 inline Method* unchecked_method_at(int i) const; |
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70 inline Method** adr_method_at(int i) const; |
0 | 71 |
72 // searching; all methods return -1 if not found | |
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73 int index_of(Method* 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 |
6934 | 87 static void compute_vtable_size_and_num_mirandas( |
88 int* vtable_length, int* num_new_mirandas, | |
89 GrowableArray<Method*>* all_mirandas, Klass* super, | |
90 Array<Method*>* methods, AccessFlags class_flags, Handle classloader, | |
91 Symbol* classname, Array<Klass*>* local_interfaces, 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. | |
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99 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 100 int methods_length, bool * trace_name_printed); |
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); | |
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118 int index_of(Method* m, int len) const; // same as index_of, but search only up to len |
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119 void put_method_at(Method* m, int index); |
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120 static bool needs_new_vtable_entry(methodHandle m, Klass* super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS); |
0 | 121 |
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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, Symbol* target_classname, Thread* THREAD); |
0 | 125 |
126 // support for miranda methods | |
127 bool is_miranda_entry_at(int i); | |
6934 | 128 void fill_in_mirandas(int* initialized); |
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129 static bool is_miranda(Method* m, Array<Method*>* class_methods, Klass* super); |
6934 | 130 static void add_new_mirandas_to_lists( |
131 GrowableArray<Method*>* new_mirandas, | |
132 GrowableArray<Method*>* all_mirandas, | |
133 Array<Method*>* current_interface_methods, Array<Method*>* class_methods, | |
134 Klass* super); | |
135 static void get_mirandas( | |
136 GrowableArray<Method*>* new_mirandas, | |
137 GrowableArray<Method*>* all_mirandas, Klass* super, | |
138 Array<Method*>* class_methods, Array<Klass*>* local_interfaces); | |
0 | 139 |
140 void verify_against(outputStream* st, klassVtable* vt, int index); | |
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141 inline InstanceKlass* ik() const; |
0 | 142 }; |
143 | |
144 | |
145 // private helper class for klassVtable | |
146 // description of entry points: | |
147 // destination is interpreted: | |
148 // from_compiled_code_entry_point -> c2iadapter | |
149 // from_interpreter_entry_point -> interpreter entry point | |
150 // destination is compiled: | |
151 // from_compiled_code_entry_point -> nmethod entry point | |
152 // from_interpreter_entry_point -> i2cadapter | |
153 class vtableEntry VALUE_OBJ_CLASS_SPEC { | |
154 public: | |
155 // size in words | |
156 static int size() { | |
157 return sizeof(vtableEntry) / sizeof(HeapWord); | |
158 } | |
159 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } | |
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160 Method* method() const { return _method; } |
0 | 161 |
162 private: | |
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163 Method* _method; |
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164 void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
0 | 165 void clear() { _method = NULL; } |
166 void print() PRODUCT_RETURN; | |
167 void verify(klassVtable* vt, outputStream* st); | |
168 | |
169 friend class klassVtable; | |
170 }; | |
171 | |
172 | |
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173 inline Method* klassVtable::method_at(int i) const { |
0 | 174 assert(i >= 0 && i < _length, "index out of bounds"); |
175 assert(table()[i].method() != NULL, "should not be null"); | |
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176 assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
0 | 177 return table()[i].method(); |
178 } | |
179 | |
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180 inline Method* klassVtable::unchecked_method_at(int i) const { |
0 | 181 assert(i >= 0 && i < _length, "index out of bounds"); |
182 return table()[i].method(); | |
183 } | |
184 | |
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185 inline Method** klassVtable::adr_method_at(int i) const { |
0 | 186 // Allow one past the last entry to be referenced; useful for loop bounds. |
187 assert(i >= 0 && i <= _length, "index out of bounds"); | |
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188 return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
0 | 189 } |
190 | |
191 // -------------------------------------------------------------------------------- | |
192 class klassItable; | |
193 class itableMethodEntry; | |
194 | |
195 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
196 private: | |
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197 Klass* _interface; |
0 | 198 int _offset; |
199 public: | |
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200 Klass* interface_klass() const { return _interface; } |
0 | 201 int offset() const { return _offset; } |
202 | |
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203 static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
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204 itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
0 | 205 |
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206 void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
0 | 207 |
208 // Static size and offset accessors | |
209 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words | |
210 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } | |
211 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } | |
212 | |
213 friend class klassItable; | |
214 }; | |
215 | |
216 | |
217 class itableMethodEntry VALUE_OBJ_CLASS_SPEC { | |
218 private: | |
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219 Method* _method; |
0 | 220 |
221 public: | |
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222 Method* method() const { return _method; } |
0 | 223 |
224 void clear() { _method = NULL; } | |
225 | |
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226 void initialize(Method* method); |
0 | 227 |
228 // Static size and offset accessors | |
229 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words | |
230 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } | |
231 | |
232 friend class klassItable; | |
233 }; | |
234 | |
235 // | |
236 // Format of an itable | |
237 // | |
238 // ---- offset table --- | |
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239 // Klass* of interface 1 \ |
0 | 240 // offset to vtable from start of oop / offset table entry |
241 // ... | |
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242 // Klass* of interface n \ |
0 | 243 // offset to vtable from start of oop / offset table entry |
244 // --- vtable for interface 1 --- | |
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245 // Method* \ |
0 | 246 // compiler entry point / method table entry |
247 // ... | |
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248 // Method* \ |
0 | 249 // compiler entry point / method table entry |
250 // -- vtable for interface 2 --- | |
251 // ... | |
252 // | |
253 class klassItable : public ResourceObj { | |
254 private: | |
255 instanceKlassHandle _klass; // my klass | |
256 int _table_offset; // offset of start of itable data within klass (in words) | |
257 int _size_offset_table; // size of offset table (in itableOffset entries) | |
258 int _size_method_table; // size of methodtable (in itableMethodEntry entries) | |
259 | |
260 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); | |
261 public: | |
262 klassItable(instanceKlassHandle klass); | |
263 | |
264 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); | |
265 return &((itableOffsetEntry*)vtable_start())[i]; } | |
266 | |
267 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); | |
268 return &((itableMethodEntry*)method_start())[i]; } | |
269 | |
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270 int size_offset_table() { return _size_offset_table; } |
0 | 271 |
272 // Initialization | |
273 void initialize_itable(bool checkconstraints, TRAPS); | |
274 | |
275 // Updates | |
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276 void initialize_with_method(Method* m); |
0 | 277 |
278 // RedefineClasses() API support: | |
279 // if any entry of this itable points to any of old_methods, | |
280 // replace it with the corresponding new_method. | |
281 // trace_name_printed is set to true if the current call has | |
282 // printed the klass name so that other routines in the adjust_* | |
283 // group don't print the klass name. | |
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284 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 285 int methods_length, bool * trace_name_printed); |
286 | |
287 // Setup of itable | |
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288 static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
0 | 289 static void setup_itable_offset_table(instanceKlassHandle klass); |
290 | |
291 // Resolving of method to index | |
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292 static int compute_itable_index(Method* m); |
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293 // ...and back again: |
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294 static Method* method_for_itable_index(Klass* klass, int itable_index); |
0 | 295 |
296 // Debugging/Statistics | |
297 static void print_statistics() PRODUCT_RETURN; | |
298 private: | |
299 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
300 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
301 | |
302 // Helper methods | |
303 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
304 | |
305 // Statistics | |
306 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
307 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
308 | |
309 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
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310 |
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311 public: |
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312 #ifndef PRODUCT |
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313 bool check_no_old_entries(); |
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314 #endif |
0 | 315 }; |
1972 | 316 |
317 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |