Mercurial > hg > graal-compiler
annotate src/share/vm/oops/symbolKlass.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | 9d7a8ab3736b |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2006, 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 | |
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7 * published by the Free Software Foundation. | |
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_symbolKlass.cpp.incl" | |
27 | |
28 symbolOop symbolKlass::allocate_symbol(u1* name, int len, TRAPS) { | |
29 // Don't allow symbol oops to be created which cannot fit in a symbolOop. | |
30 if (len > symbolOopDesc::max_length()) { | |
31 THROW_MSG_0(vmSymbols::java_lang_InternalError(), | |
32 "name is too long to represent"); | |
33 } | |
34 int size = symbolOopDesc::object_size(len); | |
35 symbolKlassHandle h_k(THREAD, as_klassOop()); | |
36 symbolOop sym = (symbolOop) | |
37 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); | |
38 assert(!sym->is_parsable(), "not expecting parsability yet."); | |
39 No_Safepoint_Verifier no_safepoint; | |
40 sym->set_utf8_length(len); | |
41 for (int i = 0; i < len; i++) { | |
42 sym->byte_at_put(i, name[i]); | |
43 } | |
44 // Let the first emptySymbol be created and | |
45 // ensure only one is ever created. | |
46 assert(sym->is_parsable() || Universe::emptySymbol() == NULL, | |
47 "should be parsable here."); | |
48 return sym; | |
49 } | |
50 | |
51 bool symbolKlass::allocate_symbols(int names_count, const char** names, | |
52 int* lengths, symbolOop* sym_oops, TRAPS) { | |
53 if (UseConcMarkSweepGC || UseParallelGC) { | |
54 // Concurrent GC needs to mark all the allocated symbol oops after | |
55 // the remark phase which isn't done below (except the first symbol oop). | |
56 // So return false which will let the symbols be allocated one by one. | |
57 // The parallel collector uses an object start array to find the | |
58 // start of objects on a dirty card. The object start array is not | |
59 // updated for the start of each symbol so is not precise. During | |
60 // object array verification this causes a verification failure. | |
61 // In a product build this causes extra searching for the start of | |
62 // a symbol. As with the concurrent collector a return of false will | |
63 // cause each symbol to be allocated separately and in the case | |
64 // of the parallel collector will cause the object | |
65 // start array to be updated. | |
66 return false; | |
67 } | |
68 | |
69 assert(names_count > 0, "can't allocate 0 symbols"); | |
70 | |
71 int total_size = 0; | |
72 int i, sizes[SymbolTable::symbol_alloc_batch_size]; | |
73 for (i=0; i<names_count; i++) { | |
74 int len = lengths[i]; | |
75 if (len > symbolOopDesc::max_length()) { | |
76 return false; | |
77 } | |
78 int sz = symbolOopDesc::object_size(len); | |
79 sizes[i] = sz * HeapWordSize; | |
80 total_size += sz; | |
81 } | |
82 symbolKlassHandle h_k(THREAD, as_klassOop()); | |
83 HeapWord* base = Universe::heap()->permanent_mem_allocate(total_size); | |
84 if (base == NULL) { | |
85 return false; | |
86 } | |
87 | |
88 // CAN'T take any safepoint during the initialization of the symbol oops ! | |
89 No_Safepoint_Verifier nosafepoint; | |
90 | |
91 klassOop sk = h_k(); | |
92 int pos = 0; | |
93 for (i=0; i<names_count; i++) { | |
94 symbolOop s = (symbolOop) (((char*)base) + pos); | |
95 s->set_mark(markOopDesc::prototype()); | |
96 s->set_klass(sk); | |
97 s->set_utf8_length(lengths[i]); | |
98 const char* name = names[i]; | |
99 for (int j=0; j<lengths[i]; j++) { | |
100 s->byte_at_put(j, name[j]); | |
101 } | |
102 | |
103 assert(s->is_parsable(), "should be parsable here."); | |
104 | |
105 sym_oops[i] = s; | |
106 pos += sizes[i]; | |
107 } | |
108 return true; | |
109 } | |
110 | |
111 klassOop symbolKlass::create_klass(TRAPS) { | |
112 symbolKlass o; | |
113 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj()); | |
114 KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL); | |
115 // Make sure size calculation is right | |
116 assert(k()->size() == align_object_size(header_size()), "wrong size for object"); | |
117 // java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror | |
118 return k(); | |
119 } | |
120 | |
121 int symbolKlass::oop_size(oop obj) const { | |
122 assert(obj->is_symbol(),"must be a symbol"); | |
123 symbolOop s = symbolOop(obj); | |
124 int size = s->object_size(); | |
125 return size; | |
126 } | |
127 | |
128 bool symbolKlass::oop_is_parsable(oop obj) const { | |
129 assert(obj->is_symbol(),"must be a symbol"); | |
130 symbolOop s = symbolOop(obj); | |
131 return s->object_is_parsable(); | |
132 } | |
133 | |
134 void symbolKlass::oop_follow_contents(oop obj) { | |
135 assert (obj->is_symbol(), "object must be symbol"); | |
136 // Performance tweak: We skip iterating over the klass pointer since we | |
137 // know that Universe::symbolKlassObj never moves. | |
138 // Note: do not follow next link here (see SymbolTable::follow_contents) | |
139 } | |
140 | |
141 #ifndef SERIALGC | |
142 void symbolKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) { | |
143 assert (obj->is_symbol(), "object must be symbol"); | |
144 // Performance tweak: We skip iterating over the klass pointer since we | |
145 // know that Universe::symbolKlassObj never moves. | |
146 // Note: do not follow next link here (see SymbolTable::follow_contents) | |
147 } | |
148 #endif // SERIALGC | |
149 | |
150 int symbolKlass::oop_oop_iterate(oop obj, OopClosure* blk) { | |
151 assert(obj->is_symbol(), "object must be symbol"); | |
152 symbolOop s = symbolOop(obj); | |
153 // Get size before changing pointers. | |
154 // Don't call size() or oop_size() since that is a virtual call. | |
155 int size = s->object_size(); | |
156 // Performance tweak: We skip iterating over the klass pointer since we | |
157 // know that Universe::symbolKlassObj never moves. | |
158 return size; | |
159 } | |
160 | |
161 | |
162 int symbolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
163 assert(obj->is_symbol(), "object must be symbol"); | |
164 symbolOop s = symbolOop(obj); | |
165 // Get size before changing pointers. | |
166 // Don't call size() or oop_size() since that is a virtual call. | |
167 int size = s->object_size(); | |
168 // Performance tweak: We skip iterating over the klass pointer since we | |
169 // know that Universe::symbolKlassObj never moves. | |
170 return size; | |
171 } | |
172 | |
173 | |
174 int symbolKlass::oop_adjust_pointers(oop obj) { | |
175 assert(obj->is_symbol(), "should be symbol"); | |
176 symbolOop s = symbolOop(obj); | |
177 // Get size before changing pointers. | |
178 // Don't call size() or oop_size() since that is a virtual call. | |
179 int size = s->object_size(); | |
180 // Performance tweak: We skip iterating over the klass pointer since we | |
181 // know that Universe::symbolKlassObj never moves. | |
182 return size; | |
183 } | |
184 | |
185 | |
186 #ifndef SERIALGC | |
187 void symbolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
188 assert(obj->is_symbol(), "should be symbol"); | |
189 } | |
190 | |
191 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
192 assert(obj->is_symbol(), "should be symbol"); | |
193 return symbolOop(obj)->object_size(); | |
194 } | |
195 | |
196 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj, | |
197 HeapWord* beg_addr, HeapWord* end_addr) { | |
198 assert(obj->is_symbol(), "should be symbol"); | |
199 return symbolOop(obj)->object_size(); | |
200 } | |
201 #endif // SERIALGC | |
202 | |
203 #ifndef PRODUCT | |
204 // Printing | |
205 | |
206 void symbolKlass::oop_print_on(oop obj, outputStream* st) { | |
207 st->print("Symbol: '"); | |
222 | 208 symbolOop(obj)->print_symbol_on(st); |
0 | 209 st->print("'"); |
210 } | |
211 | |
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212 #endif //PRODUCT |
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213 |
0 | 214 void symbolKlass::oop_print_value_on(oop obj, outputStream* st) { |
215 symbolOop sym = symbolOop(obj); | |
216 st->print("'"); | |
217 for (int i = 0; i < sym->utf8_length(); i++) { | |
218 st->print("%c", sym->byte_at(i)); | |
219 } | |
220 st->print("'"); | |
221 } | |
222 | |
223 const char* symbolKlass::internal_name() const { | |
224 return "{symbol}"; | |
225 } |