Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.hpp @ 12873:4e7f99b70d9d
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author | adlertz |
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date | Wed, 09 Oct 2013 05:03:34 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 |
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93 #if INCLUDE_JVMTI |
0 | 94 // RedefineClasses() API support: |
95 // If any entry of this vtable points to any of old_methods, | |
96 // replace it with the corresponding new_method. | |
97 // trace_name_printed is set to true if the current call has | |
98 // printed the klass name so that other routines in the adjust_* | |
99 // group don't print the klass name. | |
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100 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 101 int methods_length, bool * trace_name_printed); |
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102 bool check_no_old_or_obsolete_entries(); |
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103 void dump_vtable(); |
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104 #endif // INCLUDE_JVMTI |
0 | 105 |
106 // Debugging code | |
107 void print() PRODUCT_RETURN; | |
108 void verify(outputStream* st, bool force = false); | |
109 static void print_statistics() PRODUCT_RETURN; | |
110 | |
111 protected: | |
112 friend class vtableEntry; | |
113 private: | |
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114 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ; |
0 | 115 void copy_vtable_to(vtableEntry* start); |
116 int initialize_from_super(KlassHandle super); | |
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117 int index_of(Method* m, int len) const; // same as index_of, but search only up to len |
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118 void put_method_at(Method* m, int index); |
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119 static bool needs_new_vtable_entry(methodHandle m, Klass* super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS); |
0 | 120 |
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121 bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS); |
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122 InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index, |
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123 Handle target_loader, Symbol* target_classname, Thread* THREAD); |
0 | 124 |
125 // support for miranda methods | |
126 bool is_miranda_entry_at(int i); | |
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127 int fill_in_mirandas(int initialized); |
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128 static bool is_miranda(Method* m, Array<Method*>* class_methods, Klass* super); |
6934 | 129 static void add_new_mirandas_to_lists( |
130 GrowableArray<Method*>* new_mirandas, | |
131 GrowableArray<Method*>* all_mirandas, | |
132 Array<Method*>* current_interface_methods, Array<Method*>* class_methods, | |
133 Klass* super); | |
134 static void get_mirandas( | |
135 GrowableArray<Method*>* new_mirandas, | |
136 GrowableArray<Method*>* all_mirandas, Klass* super, | |
137 Array<Method*>* class_methods, Array<Klass*>* local_interfaces); | |
0 | 138 |
139 void verify_against(outputStream* st, klassVtable* vt, int index); | |
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140 inline InstanceKlass* ik() const; |
0 | 141 }; |
142 | |
143 | |
144 // private helper class for klassVtable | |
145 // description of entry points: | |
146 // destination is interpreted: | |
147 // from_compiled_code_entry_point -> c2iadapter | |
148 // from_interpreter_entry_point -> interpreter entry point | |
149 // destination is compiled: | |
150 // from_compiled_code_entry_point -> nmethod entry point | |
151 // from_interpreter_entry_point -> i2cadapter | |
152 class vtableEntry VALUE_OBJ_CLASS_SPEC { | |
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153 friend class VMStructs; |
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154 |
0 | 155 public: |
156 // size in words | |
157 static int size() { | |
158 return sizeof(vtableEntry) / sizeof(HeapWord); | |
159 } | |
160 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } | |
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161 Method* method() const { return _method; } |
0 | 162 |
163 private: | |
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164 Method* _method; |
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165 void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
0 | 166 void clear() { _method = NULL; } |
167 void print() PRODUCT_RETURN; | |
168 void verify(klassVtable* vt, outputStream* st); | |
169 | |
170 friend class klassVtable; | |
171 }; | |
172 | |
173 | |
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174 inline Method* klassVtable::method_at(int i) const { |
0 | 175 assert(i >= 0 && i < _length, "index out of bounds"); |
176 assert(table()[i].method() != NULL, "should not be null"); | |
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177 assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
0 | 178 return table()[i].method(); |
179 } | |
180 | |
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181 inline Method* klassVtable::unchecked_method_at(int i) const { |
0 | 182 assert(i >= 0 && i < _length, "index out of bounds"); |
183 return table()[i].method(); | |
184 } | |
185 | |
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186 inline Method** klassVtable::adr_method_at(int i) const { |
0 | 187 // Allow one past the last entry to be referenced; useful for loop bounds. |
188 assert(i >= 0 && i <= _length, "index out of bounds"); | |
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189 return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
0 | 190 } |
191 | |
192 // -------------------------------------------------------------------------------- | |
193 class klassItable; | |
194 class itableMethodEntry; | |
195 | |
196 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
197 private: | |
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198 Klass* _interface; |
0 | 199 int _offset; |
200 public: | |
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201 Klass* interface_klass() const { return _interface; } |
0 | 202 int offset() const { return _offset; } |
203 | |
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204 static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
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205 itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
0 | 206 |
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207 void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
0 | 208 |
209 // Static size and offset accessors | |
210 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words | |
211 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } | |
212 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } | |
213 | |
214 friend class klassItable; | |
215 }; | |
216 | |
217 | |
218 class itableMethodEntry VALUE_OBJ_CLASS_SPEC { | |
219 private: | |
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220 Method* _method; |
0 | 221 |
222 public: | |
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223 Method* method() const { return _method; } |
0 | 224 |
225 void clear() { _method = NULL; } | |
226 | |
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227 void initialize(Method* method); |
0 | 228 |
229 // Static size and offset accessors | |
230 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words | |
231 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } | |
232 | |
233 friend class klassItable; | |
234 }; | |
235 | |
236 // | |
237 // Format of an itable | |
238 // | |
239 // ---- offset table --- | |
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240 // Klass* of interface 1 \ |
0 | 241 // offset to vtable from start of oop / offset table entry |
242 // ... | |
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243 // Klass* of interface n \ |
0 | 244 // offset to vtable from start of oop / offset table entry |
245 // --- vtable for interface 1 --- | |
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246 // Method* \ |
0 | 247 // compiler entry point / method table entry |
248 // ... | |
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249 // Method* \ |
0 | 250 // compiler entry point / method table entry |
251 // -- vtable for interface 2 --- | |
252 // ... | |
253 // | |
254 class klassItable : public ResourceObj { | |
255 private: | |
256 instanceKlassHandle _klass; // my klass | |
257 int _table_offset; // offset of start of itable data within klass (in words) | |
258 int _size_offset_table; // size of offset table (in itableOffset entries) | |
259 int _size_method_table; // size of methodtable (in itableMethodEntry entries) | |
260 | |
261 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); | |
262 public: | |
263 klassItable(instanceKlassHandle klass); | |
264 | |
265 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); | |
266 return &((itableOffsetEntry*)vtable_start())[i]; } | |
267 | |
268 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); | |
269 return &((itableMethodEntry*)method_start())[i]; } | |
270 | |
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271 int size_offset_table() { return _size_offset_table; } |
0 | 272 |
273 // Initialization | |
274 void initialize_itable(bool checkconstraints, TRAPS); | |
275 | |
276 // Updates | |
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277 void initialize_with_method(Method* m); |
0 | 278 |
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279 #if INCLUDE_JVMTI |
0 | 280 // RedefineClasses() API support: |
281 // if any entry of this itable points to any of old_methods, | |
282 // replace it with the corresponding new_method. | |
283 // trace_name_printed is set to true if the current call has | |
284 // printed the klass name so that other routines in the adjust_* | |
285 // group don't print the klass name. | |
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286 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 287 int methods_length, bool * trace_name_printed); |
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288 bool check_no_old_or_obsolete_entries(); |
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289 void dump_itable(); |
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290 #endif // INCLUDE_JVMTI |
0 | 291 |
292 // Setup of itable | |
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293 static int assign_itable_indexes_for_interface(Klass* klass); |
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294 static int method_count_for_interface(Klass* klass); |
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295 static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
0 | 296 static void setup_itable_offset_table(instanceKlassHandle klass); |
297 | |
298 // Resolving of method to index | |
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299 static Method* method_for_itable_index(Klass* klass, int itable_index); |
0 | 300 |
301 // Debugging/Statistics | |
302 static void print_statistics() PRODUCT_RETURN; | |
303 private: | |
304 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
305 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
306 | |
307 // Helper methods | |
308 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
309 | |
310 // Statistics | |
311 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
312 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
313 | |
314 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
315 }; | |
1972 | 316 |
317 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |