Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.hpp @ 3245:8ce625481709
7032407: Crash in LinkResolver::runtime_resolve_virtual_method()
Summary: Make CDS reorder vtables so that dump time vtables match run time order, so when redefine classes reinitializes them, they aren't in the wrong order.
Reviewed-by: dcubed, acorn
| author | coleenp |
|---|---|
| date | Fri, 15 Apr 2011 09:36:28 -0400 |
| parents | e5383553fd4e |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 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 |