Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.hpp @ 17716:cdb71841f4bc
6498581: ThreadInterruptTest3 produces wrong output on Windows
Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author | minqi |
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date | Wed, 26 Feb 2014 15:20:41 -0800 |
parents | ac9cb1d5a202 |
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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 bool adjust_default_method(int vtable_index, Method* old_method, Method* new_method); |
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101 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 102 int methods_length, bool * trace_name_printed); |
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103 bool check_no_old_or_obsolete_entries(); |
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104 void dump_vtable(); |
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105 #endif // INCLUDE_JVMTI |
0 | 106 |
107 // Debugging code | |
108 void print() PRODUCT_RETURN; | |
109 void verify(outputStream* st, bool force = false); | |
110 static void print_statistics() PRODUCT_RETURN; | |
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, int default_index, 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); | |
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128 int fill_in_mirandas(int initialized); |
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129 static bool is_miranda(Method* m, Array<Method*>* class_methods, |
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130 Array<Method*>* default_methods, Klass* super); |
6934 | 131 static void add_new_mirandas_to_lists( |
132 GrowableArray<Method*>* new_mirandas, | |
133 GrowableArray<Method*>* all_mirandas, | |
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134 Array<Method*>* current_interface_methods, |
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135 Array<Method*>* class_methods, |
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136 Array<Method*>* default_methods, |
6934 | 137 Klass* super); |
138 static void get_mirandas( | |
139 GrowableArray<Method*>* new_mirandas, | |
140 GrowableArray<Method*>* all_mirandas, Klass* super, | |
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141 Array<Method*>* class_methods, |
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142 Array<Method*>* default_methods, |
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143 Array<Klass*>* local_interfaces); |
0 | 144 void verify_against(outputStream* st, klassVtable* vt, int index); |
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145 inline InstanceKlass* ik() const; |
0 | 146 }; |
147 | |
148 | |
149 // private helper class for klassVtable | |
150 // description of entry points: | |
151 // destination is interpreted: | |
152 // from_compiled_code_entry_point -> c2iadapter | |
153 // from_interpreter_entry_point -> interpreter entry point | |
154 // destination is compiled: | |
155 // from_compiled_code_entry_point -> nmethod entry point | |
156 // from_interpreter_entry_point -> i2cadapter | |
157 class vtableEntry VALUE_OBJ_CLASS_SPEC { | |
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158 friend class VMStructs; |
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159 |
0 | 160 public: |
161 // size in words | |
162 static int size() { | |
163 return sizeof(vtableEntry) / sizeof(HeapWord); | |
164 } | |
165 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } | |
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166 Method* method() const { return _method; } |
0 | 167 |
168 private: | |
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169 Method* _method; |
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170 void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
0 | 171 void clear() { _method = NULL; } |
172 void print() PRODUCT_RETURN; | |
173 void verify(klassVtable* vt, outputStream* st); | |
174 | |
175 friend class klassVtable; | |
176 }; | |
177 | |
178 | |
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179 inline Method* klassVtable::method_at(int i) const { |
0 | 180 assert(i >= 0 && i < _length, "index out of bounds"); |
181 assert(table()[i].method() != NULL, "should not be null"); | |
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182 assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
0 | 183 return table()[i].method(); |
184 } | |
185 | |
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186 inline Method* klassVtable::unchecked_method_at(int i) const { |
0 | 187 assert(i >= 0 && i < _length, "index out of bounds"); |
188 return table()[i].method(); | |
189 } | |
190 | |
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191 inline Method** klassVtable::adr_method_at(int i) const { |
0 | 192 // Allow one past the last entry to be referenced; useful for loop bounds. |
193 assert(i >= 0 && i <= _length, "index out of bounds"); | |
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194 return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
0 | 195 } |
196 | |
197 // -------------------------------------------------------------------------------- | |
198 class klassItable; | |
199 class itableMethodEntry; | |
200 | |
201 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { | |
202 private: | |
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203 Klass* _interface; |
0 | 204 int _offset; |
205 public: | |
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206 Klass* interface_klass() const { return _interface; } |
0 | 207 int offset() const { return _offset; } |
208 | |
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209 static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
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210 itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
0 | 211 |
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212 void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
0 | 213 |
214 // Static size and offset accessors | |
215 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words | |
216 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } | |
217 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } | |
218 | |
219 friend class klassItable; | |
220 }; | |
221 | |
222 | |
223 class itableMethodEntry VALUE_OBJ_CLASS_SPEC { | |
224 private: | |
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225 Method* _method; |
0 | 226 |
227 public: | |
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228 Method* method() const { return _method; } |
0 | 229 |
230 void clear() { _method = NULL; } | |
231 | |
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232 void initialize(Method* method); |
0 | 233 |
234 // Static size and offset accessors | |
235 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words | |
236 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } | |
237 | |
238 friend class klassItable; | |
239 }; | |
240 | |
241 // | |
242 // Format of an itable | |
243 // | |
244 // ---- offset table --- | |
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245 // Klass* of interface 1 \ |
0 | 246 // offset to vtable from start of oop / offset table entry |
247 // ... | |
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248 // Klass* of interface n \ |
0 | 249 // offset to vtable from start of oop / offset table entry |
250 // --- vtable for interface 1 --- | |
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251 // Method* \ |
0 | 252 // compiler entry point / method table entry |
253 // ... | |
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254 // Method* \ |
0 | 255 // compiler entry point / method table entry |
256 // -- vtable for interface 2 --- | |
257 // ... | |
258 // | |
259 class klassItable : public ResourceObj { | |
260 private: | |
261 instanceKlassHandle _klass; // my klass | |
262 int _table_offset; // offset of start of itable data within klass (in words) | |
263 int _size_offset_table; // size of offset table (in itableOffset entries) | |
264 int _size_method_table; // size of methodtable (in itableMethodEntry entries) | |
265 | |
266 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); | |
267 public: | |
268 klassItable(instanceKlassHandle klass); | |
269 | |
270 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); | |
271 return &((itableOffsetEntry*)vtable_start())[i]; } | |
272 | |
273 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); | |
274 return &((itableMethodEntry*)method_start())[i]; } | |
275 | |
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276 int size_offset_table() { return _size_offset_table; } |
0 | 277 |
278 // Initialization | |
279 void initialize_itable(bool checkconstraints, TRAPS); | |
280 | |
281 // Updates | |
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282 void initialize_with_method(Method* m); |
0 | 283 |
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284 #if INCLUDE_JVMTI |
0 | 285 // RedefineClasses() API support: |
286 // if any entry of this itable points to any of old_methods, | |
287 // replace it with the corresponding new_method. | |
288 // trace_name_printed is set to true if the current call has | |
289 // printed the klass name so that other routines in the adjust_* | |
290 // group don't print the klass name. | |
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291 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 292 int methods_length, bool * trace_name_printed); |
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293 bool check_no_old_or_obsolete_entries(); |
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294 void dump_itable(); |
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295 #endif // INCLUDE_JVMTI |
0 | 296 |
297 // Setup of itable | |
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298 static int assign_itable_indices_for_interface(Klass* klass); |
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299 static int method_count_for_interface(Klass* klass); |
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300 static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
0 | 301 static void setup_itable_offset_table(instanceKlassHandle klass); |
302 | |
303 // Resolving of method to index | |
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304 static Method* method_for_itable_index(Klass* klass, int itable_index); |
0 | 305 |
306 // Debugging/Statistics | |
307 static void print_statistics() PRODUCT_RETURN; | |
308 private: | |
309 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } | |
310 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } | |
311 | |
312 // Helper methods | |
313 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } | |
314 | |
315 // Statistics | |
316 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables | |
317 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables | |
318 | |
319 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) | |
320 }; | |
1972 | 321 |
322 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |