Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klassVtable.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 8ce625481709 |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 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 |
| 0 | 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; } | |
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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 |
| 0 | 87 static void compute_vtable_size_and_num_mirandas(int &vtable_length, int &num_miranda_methods, |
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88 Klass* super, Array<Method*>* methods, |
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89 AccessFlags class_flags, Handle classloader, |
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90 Symbol* classname, Array<Klass*>* 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. | |
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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); | |
| 128 void fill_in_mirandas(int& initialized); | |
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129 static bool is_miranda(Method* m, Array<Method*>* class_methods, Klass* super); |
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130 static void add_new_mirandas_to_list(GrowableArray<Method*>* list_of_current_mirandas, Array<Method*>* current_interface_methods, Array<Method*>* class_methods, Klass* super); |
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131 static void get_mirandas(GrowableArray<Method*>* mirandas, Klass* super, Array<Method*>* class_methods, Array<Klass*>* local_interfaces); |
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132 static int get_num_mirandas(Klass* super, Array<Method*>* class_methods, Array<Klass*>* local_interfaces); |
| 0 | 133 |
| 134 | |
| 135 void verify_against(outputStream* st, klassVtable* vt, int index); | |
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136 inline InstanceKlass* ik() const; |
| 0 | 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); } | |
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155 Method* method() const { return _method; } |
| 0 | 156 |
| 157 private: | |
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158 Method* _method; |
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159 void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
| 0 | 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 | |
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168 inline Method* klassVtable::method_at(int i) const { |
| 0 | 169 assert(i >= 0 && i < _length, "index out of bounds"); |
| 170 assert(table()[i].method() != NULL, "should not be null"); | |
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171 assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
| 0 | 172 return table()[i].method(); |
| 173 } | |
| 174 | |
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175 inline Method* klassVtable::unchecked_method_at(int i) const { |
| 0 | 176 assert(i >= 0 && i < _length, "index out of bounds"); |
| 177 return table()[i].method(); | |
| 178 } | |
| 179 | |
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180 inline Method** klassVtable::adr_method_at(int i) const { |
| 0 | 181 // Allow one past the last entry to be referenced; useful for loop bounds. |
| 182 assert(i >= 0 && i <= _length, "index out of bounds"); | |
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183 return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
| 0 | 184 } |
| 185 | |
| 186 // -------------------------------------------------------------------------------- | |
| 187 class klassItable; | |
| 188 class itableMethodEntry; | |
| 189 | |
| 190 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
| 191 private: | |
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192 Klass* _interface; |
| 0 | 193 int _offset; |
| 194 public: | |
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195 Klass* interface_klass() const { return _interface; } |
| 0 | 196 int offset() const { return _offset; } |
| 197 | |
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198 static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
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199 itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
| 0 | 200 |
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201 void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
| 0 | 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: | |
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214 Method* _method; |
| 0 | 215 |
| 216 public: | |
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217 Method* method() const { return _method; } |
| 0 | 218 |
| 219 void clear() { _method = NULL; } | |
| 220 | |
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221 void initialize(Method* method); |
| 0 | 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 --- | |
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234 // Klass* of interface 1 \ |
| 0 | 235 // offset to vtable from start of oop / offset table entry |
| 236 // ... | |
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237 // Klass* of interface n \ |
| 0 | 238 // offset to vtable from start of oop / offset table entry |
| 239 // --- vtable for interface 1 --- | |
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240 // Method* \ |
| 0 | 241 // compiler entry point / method table entry |
| 242 // ... | |
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243 // Method* \ |
| 0 | 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 | |
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271 void initialize_with_method(Method* m); |
| 0 | 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. | |
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279 void adjust_method_entries(Method** old_methods, Method** new_methods, |
| 0 | 280 int methods_length, bool * trace_name_printed); |
| 281 | |
| 282 // Setup of itable | |
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283 static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
| 0 | 284 static void setup_itable_offset_table(instanceKlassHandle klass); |
| 285 | |
| 286 // Resolving of method to index | |
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287 static int compute_itable_index(Method* m); |
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288 // ...and back again: |
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289 static Method* method_for_itable_index(Klass* klass, int itable_index); |
| 0 | 290 |
| 291 // Debugging/Statistics | |
| 292 static void print_statistics() PRODUCT_RETURN; | |
| 293 private: | |
| 294 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
| 295 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
| 296 | |
| 297 // Helper methods | |
| 298 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
| 299 | |
| 300 // Statistics | |
| 301 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
| 302 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
| 303 | |
| 304 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
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305 |
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306 public: |
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307 #ifndef PRODUCT |
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308 bool check_no_old_entries(); |
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309 #endif |
| 0 | 310 }; |
| 1972 | 311 |
| 312 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |