Wed, 03 Sep 2014 09:25:44 +0200
Merge
duke@435 | 1 | /* |
dcubed@4562 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_OOPS_KLASSVTABLE_HPP |
stefank@2314 | 26 | #define SHARE_VM_OOPS_KLASSVTABLE_HPP |
stefank@2314 | 27 | |
stefank@2314 | 28 | #include "memory/allocation.hpp" |
stefank@2314 | 29 | #include "oops/oopsHierarchy.hpp" |
stefank@2314 | 30 | #include "runtime/handles.hpp" |
stefank@2314 | 31 | #include "utilities/growableArray.hpp" |
stefank@2314 | 32 | |
coleenp@4037 | 33 | // A klassVtable abstracts the variable-length vtable that is embedded in InstanceKlass |
coleenp@4142 | 34 | // and ArrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, |
duke@435 | 35 | // not to actually hold the vtable data. |
duke@435 | 36 | // Note: the klassVtable should not be accessed before the class has been verified |
duke@435 | 37 | // (until that point, the vtable is uninitialized). |
duke@435 | 38 | |
duke@435 | 39 | // Currently a klassVtable contains a direct reference to the vtable data, and is therefore |
duke@435 | 40 | // not preserved across GCs. |
duke@435 | 41 | |
duke@435 | 42 | class vtableEntry; |
duke@435 | 43 | |
duke@435 | 44 | class klassVtable : public ResourceObj { |
duke@435 | 45 | KlassHandle _klass; // my klass |
duke@435 | 46 | int _tableOffset; // offset of start of vtable data within klass |
duke@435 | 47 | int _length; // length of vtable (number of entries) |
duke@435 | 48 | #ifndef PRODUCT |
duke@435 | 49 | int _verify_count; // to make verify faster |
duke@435 | 50 | #endif |
duke@435 | 51 | |
duke@435 | 52 | // Ordering important, so greater_than (>) can be used as an merge operator. |
duke@435 | 53 | enum AccessType { |
duke@435 | 54 | acc_private = 0, |
duke@435 | 55 | acc_package_private = 1, |
duke@435 | 56 | acc_publicprotected = 2 |
duke@435 | 57 | }; |
duke@435 | 58 | |
duke@435 | 59 | public: |
duke@435 | 60 | klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) { |
duke@435 | 61 | _tableOffset = (address)base - (address)h_klass(); _length = length; |
duke@435 | 62 | } |
duke@435 | 63 | |
duke@435 | 64 | // accessors |
duke@435 | 65 | vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); } |
duke@435 | 66 | KlassHandle klass() const { return _klass; } |
duke@435 | 67 | int length() const { return _length; } |
coleenp@4037 | 68 | inline Method* method_at(int i) const; |
coleenp@4037 | 69 | inline Method* unchecked_method_at(int i) const; |
coleenp@4037 | 70 | inline Method** adr_method_at(int i) const; |
duke@435 | 71 | |
duke@435 | 72 | // searching; all methods return -1 if not found |
coleenp@4037 | 73 | int index_of(Method* m) const { return index_of(m, _length); } |
coleenp@2497 | 74 | int index_of_miranda(Symbol* name, Symbol* signature); |
duke@435 | 75 | |
duke@435 | 76 | void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass |
duke@435 | 77 | |
coleenp@2777 | 78 | // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
coleenp@2777 | 79 | // at dump time. Clearing gives us an easy way to tell if the vtable has |
coleenp@2777 | 80 | // already been reinitialized at dump time (see dump.cpp). Vtables can |
coleenp@2777 | 81 | // be initialized at run time by RedefineClasses so dumping the right order |
coleenp@2777 | 82 | // is necessary. |
coleenp@2777 | 83 | void clear_vtable(); |
coleenp@2777 | 84 | bool is_initialized(); |
coleenp@2777 | 85 | |
coleenp@2777 | 86 | // computes vtable length (in words) and the number of miranda methods |
kamg@4245 | 87 | static void compute_vtable_size_and_num_mirandas( |
kamg@4245 | 88 | int* vtable_length, int* num_new_mirandas, |
kamg@4245 | 89 | GrowableArray<Method*>* all_mirandas, Klass* super, |
kamg@4245 | 90 | Array<Method*>* methods, AccessFlags class_flags, Handle classloader, |
kamg@4245 | 91 | Symbol* classname, Array<Klass*>* local_interfaces, TRAPS); |
duke@435 | 92 | |
dcubed@4562 | 93 | #if INCLUDE_JVMTI |
duke@435 | 94 | // RedefineClasses() API support: |
duke@435 | 95 | // If any entry of this vtable points to any of old_methods, |
duke@435 | 96 | // replace it with the corresponding new_method. |
duke@435 | 97 | // trace_name_printed is set to true if the current call has |
duke@435 | 98 | // printed the klass name so that other routines in the adjust_* |
duke@435 | 99 | // group don't print the klass name. |
acorn@5848 | 100 | bool adjust_default_method(int vtable_index, Method* old_method, Method* new_method); |
coleenp@4037 | 101 | void adjust_method_entries(Method** old_methods, Method** new_methods, |
duke@435 | 102 | int methods_length, bool * trace_name_printed); |
dcubed@4562 | 103 | bool check_no_old_or_obsolete_entries(); |
dcubed@4562 | 104 | void dump_vtable(); |
dcubed@4562 | 105 | #endif // INCLUDE_JVMTI |
duke@435 | 106 | |
duke@435 | 107 | // Debugging code |
duke@435 | 108 | void print() PRODUCT_RETURN; |
duke@435 | 109 | void verify(outputStream* st, bool force = false); |
duke@435 | 110 | static void print_statistics() PRODUCT_RETURN; |
duke@435 | 111 | |
duke@435 | 112 | protected: |
duke@435 | 113 | friend class vtableEntry; |
duke@435 | 114 | private: |
acorn@1087 | 115 | enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ; |
duke@435 | 116 | void copy_vtable_to(vtableEntry* start); |
duke@435 | 117 | int initialize_from_super(KlassHandle super); |
coleenp@4037 | 118 | int index_of(Method* m, int len) const; // same as index_of, but search only up to len |
coleenp@4037 | 119 | void put_method_at(Method* m, int index); |
coleenp@4037 | 120 | static bool needs_new_vtable_entry(methodHandle m, Klass* super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS); |
duke@435 | 121 | |
acorn@5848 | 122 | bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, int default_index, bool checkconstraints, TRAPS); |
coleenp@4037 | 123 | InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index, |
coleenp@2497 | 124 | Handle target_loader, Symbol* target_classname, Thread* THREAD); |
duke@435 | 125 | |
duke@435 | 126 | // support for miranda methods |
duke@435 | 127 | bool is_miranda_entry_at(int i); |
drchase@5732 | 128 | int fill_in_mirandas(int initialized); |
acorn@5848 | 129 | static bool is_miranda(Method* m, Array<Method*>* class_methods, |
acorn@5848 | 130 | Array<Method*>* default_methods, Klass* super); |
kamg@4245 | 131 | static void add_new_mirandas_to_lists( |
kamg@4245 | 132 | GrowableArray<Method*>* new_mirandas, |
kamg@4245 | 133 | GrowableArray<Method*>* all_mirandas, |
acorn@5848 | 134 | Array<Method*>* current_interface_methods, |
acorn@5848 | 135 | Array<Method*>* class_methods, |
acorn@5848 | 136 | Array<Method*>* default_methods, |
kamg@4245 | 137 | Klass* super); |
kamg@4245 | 138 | static void get_mirandas( |
kamg@4245 | 139 | GrowableArray<Method*>* new_mirandas, |
kamg@4245 | 140 | GrowableArray<Method*>* all_mirandas, Klass* super, |
acorn@5848 | 141 | Array<Method*>* class_methods, |
acorn@5848 | 142 | Array<Method*>* default_methods, |
acorn@5848 | 143 | Array<Klass*>* local_interfaces); |
duke@435 | 144 | void verify_against(outputStream* st, klassVtable* vt, int index); |
coleenp@4037 | 145 | inline InstanceKlass* ik() const; |
duke@435 | 146 | }; |
duke@435 | 147 | |
duke@435 | 148 | |
duke@435 | 149 | // private helper class for klassVtable |
duke@435 | 150 | // description of entry points: |
duke@435 | 151 | // destination is interpreted: |
duke@435 | 152 | // from_compiled_code_entry_point -> c2iadapter |
duke@435 | 153 | // from_interpreter_entry_point -> interpreter entry point |
duke@435 | 154 | // destination is compiled: |
duke@435 | 155 | // from_compiled_code_entry_point -> nmethod entry point |
duke@435 | 156 | // from_interpreter_entry_point -> i2cadapter |
duke@435 | 157 | class vtableEntry VALUE_OBJ_CLASS_SPEC { |
twisti@5726 | 158 | friend class VMStructs; |
twisti@5726 | 159 | |
duke@435 | 160 | public: |
duke@435 | 161 | // size in words |
duke@435 | 162 | static int size() { |
duke@435 | 163 | return sizeof(vtableEntry) / sizeof(HeapWord); |
duke@435 | 164 | } |
duke@435 | 165 | static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } |
coleenp@4037 | 166 | Method* method() const { return _method; } |
duke@435 | 167 | |
duke@435 | 168 | private: |
coleenp@4037 | 169 | Method* _method; |
coleenp@4037 | 170 | void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
duke@435 | 171 | void clear() { _method = NULL; } |
duke@435 | 172 | void print() PRODUCT_RETURN; |
duke@435 | 173 | void verify(klassVtable* vt, outputStream* st); |
duke@435 | 174 | |
duke@435 | 175 | friend class klassVtable; |
duke@435 | 176 | }; |
duke@435 | 177 | |
duke@435 | 178 | |
coleenp@4037 | 179 | inline Method* klassVtable::method_at(int i) const { |
duke@435 | 180 | assert(i >= 0 && i < _length, "index out of bounds"); |
duke@435 | 181 | assert(table()[i].method() != NULL, "should not be null"); |
coleenp@4037 | 182 | assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
duke@435 | 183 | return table()[i].method(); |
duke@435 | 184 | } |
duke@435 | 185 | |
coleenp@4037 | 186 | inline Method* klassVtable::unchecked_method_at(int i) const { |
duke@435 | 187 | assert(i >= 0 && i < _length, "index out of bounds"); |
duke@435 | 188 | return table()[i].method(); |
duke@435 | 189 | } |
duke@435 | 190 | |
coleenp@4037 | 191 | inline Method** klassVtable::adr_method_at(int i) const { |
duke@435 | 192 | // Allow one past the last entry to be referenced; useful for loop bounds. |
duke@435 | 193 | assert(i >= 0 && i <= _length, "index out of bounds"); |
coleenp@4037 | 194 | return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
duke@435 | 195 | } |
duke@435 | 196 | |
duke@435 | 197 | // -------------------------------------------------------------------------------- |
duke@435 | 198 | class klassItable; |
duke@435 | 199 | class itableMethodEntry; |
duke@435 | 200 | |
duke@435 | 201 | class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { |
duke@435 | 202 | private: |
coleenp@4037 | 203 | Klass* _interface; |
duke@435 | 204 | int _offset; |
duke@435 | 205 | public: |
coleenp@4037 | 206 | Klass* interface_klass() const { return _interface; } |
duke@435 | 207 | int offset() const { return _offset; } |
duke@435 | 208 | |
coleenp@4037 | 209 | static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
coleenp@4037 | 210 | itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
duke@435 | 211 | |
coleenp@4037 | 212 | void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
duke@435 | 213 | |
duke@435 | 214 | // Static size and offset accessors |
duke@435 | 215 | static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words |
duke@435 | 216 | static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } |
duke@435 | 217 | static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } |
duke@435 | 218 | |
duke@435 | 219 | friend class klassItable; |
duke@435 | 220 | }; |
duke@435 | 221 | |
duke@435 | 222 | |
duke@435 | 223 | class itableMethodEntry VALUE_OBJ_CLASS_SPEC { |
duke@435 | 224 | private: |
coleenp@4037 | 225 | Method* _method; |
duke@435 | 226 | |
duke@435 | 227 | public: |
coleenp@4037 | 228 | Method* method() const { return _method; } |
duke@435 | 229 | |
duke@435 | 230 | void clear() { _method = NULL; } |
duke@435 | 231 | |
coleenp@4037 | 232 | void initialize(Method* method); |
duke@435 | 233 | |
duke@435 | 234 | // Static size and offset accessors |
duke@435 | 235 | static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words |
duke@435 | 236 | static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } |
duke@435 | 237 | |
duke@435 | 238 | friend class klassItable; |
duke@435 | 239 | }; |
duke@435 | 240 | |
duke@435 | 241 | // |
duke@435 | 242 | // Format of an itable |
duke@435 | 243 | // |
duke@435 | 244 | // ---- offset table --- |
coleenp@4037 | 245 | // Klass* of interface 1 \ |
duke@435 | 246 | // offset to vtable from start of oop / offset table entry |
duke@435 | 247 | // ... |
coleenp@4037 | 248 | // Klass* of interface n \ |
duke@435 | 249 | // offset to vtable from start of oop / offset table entry |
duke@435 | 250 | // --- vtable for interface 1 --- |
coleenp@4037 | 251 | // Method* \ |
duke@435 | 252 | // compiler entry point / method table entry |
duke@435 | 253 | // ... |
coleenp@4037 | 254 | // Method* \ |
duke@435 | 255 | // compiler entry point / method table entry |
duke@435 | 256 | // -- vtable for interface 2 --- |
duke@435 | 257 | // ... |
duke@435 | 258 | // |
duke@435 | 259 | class klassItable : public ResourceObj { |
duke@435 | 260 | private: |
duke@435 | 261 | instanceKlassHandle _klass; // my klass |
duke@435 | 262 | int _table_offset; // offset of start of itable data within klass (in words) |
duke@435 | 263 | int _size_offset_table; // size of offset table (in itableOffset entries) |
duke@435 | 264 | int _size_method_table; // size of methodtable (in itableMethodEntry entries) |
duke@435 | 265 | |
duke@435 | 266 | void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); |
duke@435 | 267 | public: |
duke@435 | 268 | klassItable(instanceKlassHandle klass); |
duke@435 | 269 | |
duke@435 | 270 | itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); |
duke@435 | 271 | return &((itableOffsetEntry*)vtable_start())[i]; } |
duke@435 | 272 | |
duke@435 | 273 | itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); |
duke@435 | 274 | return &((itableMethodEntry*)method_start())[i]; } |
duke@435 | 275 | |
dcubed@451 | 276 | int size_offset_table() { return _size_offset_table; } |
duke@435 | 277 | |
duke@435 | 278 | // Initialization |
duke@435 | 279 | void initialize_itable(bool checkconstraints, TRAPS); |
duke@435 | 280 | |
duke@435 | 281 | // Updates |
coleenp@4037 | 282 | void initialize_with_method(Method* m); |
duke@435 | 283 | |
dcubed@4562 | 284 | #if INCLUDE_JVMTI |
duke@435 | 285 | // RedefineClasses() API support: |
duke@435 | 286 | // if any entry of this itable points to any of old_methods, |
duke@435 | 287 | // replace it with the corresponding new_method. |
duke@435 | 288 | // trace_name_printed is set to true if the current call has |
duke@435 | 289 | // printed the klass name so that other routines in the adjust_* |
duke@435 | 290 | // group don't print the klass name. |
coleenp@4037 | 291 | void adjust_method_entries(Method** old_methods, Method** new_methods, |
duke@435 | 292 | int methods_length, bool * trace_name_printed); |
dcubed@4562 | 293 | bool check_no_old_or_obsolete_entries(); |
dcubed@4562 | 294 | void dump_itable(); |
dcubed@4562 | 295 | #endif // INCLUDE_JVMTI |
duke@435 | 296 | |
duke@435 | 297 | // Setup of itable |
acorn@5848 | 298 | static int assign_itable_indices_for_interface(Klass* klass); |
drchase@5732 | 299 | static int method_count_for_interface(Klass* klass); |
coleenp@4037 | 300 | static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
duke@435 | 301 | static void setup_itable_offset_table(instanceKlassHandle klass); |
duke@435 | 302 | |
duke@435 | 303 | // Resolving of method to index |
coleenp@4037 | 304 | static Method* method_for_itable_index(Klass* klass, int itable_index); |
duke@435 | 305 | |
duke@435 | 306 | // Debugging/Statistics |
duke@435 | 307 | static void print_statistics() PRODUCT_RETURN; |
duke@435 | 308 | private: |
duke@435 | 309 | intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } |
duke@435 | 310 | intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } |
duke@435 | 311 | |
duke@435 | 312 | // Helper methods |
duke@435 | 313 | static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } |
duke@435 | 314 | |
duke@435 | 315 | // Statistics |
duke@435 | 316 | NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables |
duke@435 | 317 | NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables |
duke@435 | 318 | |
duke@435 | 319 | static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) |
duke@435 | 320 | }; |
stefank@2314 | 321 | |
stefank@2314 | 322 | #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |