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annotate src/share/vm/oops/symbolKlass.cpp @ 1978:2ca799d83d3c
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author | ohair |
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date | Tue, 30 Nov 2010 18:10:20 -0800 |
parents | f95d63e2154a |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "memory/gcLocker.hpp" | |
28 #include "oops/oop.inline.hpp" | |
29 #include "oops/symbolKlass.hpp" | |
30 #include "oops/symbolOop.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
0 | 32 |
33 symbolOop symbolKlass::allocate_symbol(u1* name, int len, TRAPS) { | |
34 // Don't allow symbol oops to be created which cannot fit in a symbolOop. | |
35 if (len > symbolOopDesc::max_length()) { | |
36 THROW_MSG_0(vmSymbols::java_lang_InternalError(), | |
37 "name is too long to represent"); | |
38 } | |
39 int size = symbolOopDesc::object_size(len); | |
40 symbolKlassHandle h_k(THREAD, as_klassOop()); | |
41 symbolOop sym = (symbolOop) | |
42 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); | |
43 assert(!sym->is_parsable(), "not expecting parsability yet."); | |
44 No_Safepoint_Verifier no_safepoint; | |
45 sym->set_utf8_length(len); | |
46 for (int i = 0; i < len; i++) { | |
47 sym->byte_at_put(i, name[i]); | |
48 } | |
49 // Let the first emptySymbol be created and | |
50 // ensure only one is ever created. | |
51 assert(sym->is_parsable() || Universe::emptySymbol() == NULL, | |
52 "should be parsable here."); | |
53 return sym; | |
54 } | |
55 | |
56 bool symbolKlass::allocate_symbols(int names_count, const char** names, | |
57 int* lengths, symbolOop* sym_oops, TRAPS) { | |
58 if (UseConcMarkSweepGC || UseParallelGC) { | |
59 // Concurrent GC needs to mark all the allocated symbol oops after | |
60 // the remark phase which isn't done below (except the first symbol oop). | |
61 // So return false which will let the symbols be allocated one by one. | |
62 // The parallel collector uses an object start array to find the | |
63 // start of objects on a dirty card. The object start array is not | |
64 // updated for the start of each symbol so is not precise. During | |
65 // object array verification this causes a verification failure. | |
66 // In a product build this causes extra searching for the start of | |
67 // a symbol. As with the concurrent collector a return of false will | |
68 // cause each symbol to be allocated separately and in the case | |
69 // of the parallel collector will cause the object | |
70 // start array to be updated. | |
71 return false; | |
72 } | |
73 | |
74 assert(names_count > 0, "can't allocate 0 symbols"); | |
75 | |
76 int total_size = 0; | |
77 int i, sizes[SymbolTable::symbol_alloc_batch_size]; | |
78 for (i=0; i<names_count; i++) { | |
79 int len = lengths[i]; | |
80 if (len > symbolOopDesc::max_length()) { | |
81 return false; | |
82 } | |
83 int sz = symbolOopDesc::object_size(len); | |
84 sizes[i] = sz * HeapWordSize; | |
85 total_size += sz; | |
86 } | |
87 symbolKlassHandle h_k(THREAD, as_klassOop()); | |
88 HeapWord* base = Universe::heap()->permanent_mem_allocate(total_size); | |
89 if (base == NULL) { | |
90 return false; | |
91 } | |
92 | |
93 // CAN'T take any safepoint during the initialization of the symbol oops ! | |
94 No_Safepoint_Verifier nosafepoint; | |
95 | |
96 klassOop sk = h_k(); | |
97 int pos = 0; | |
98 for (i=0; i<names_count; i++) { | |
99 symbolOop s = (symbolOop) (((char*)base) + pos); | |
100 s->set_mark(markOopDesc::prototype()); | |
101 s->set_klass(sk); | |
102 s->set_utf8_length(lengths[i]); | |
103 const char* name = names[i]; | |
104 for (int j=0; j<lengths[i]; j++) { | |
105 s->byte_at_put(j, name[j]); | |
106 } | |
107 | |
108 assert(s->is_parsable(), "should be parsable here."); | |
109 | |
110 sym_oops[i] = s; | |
111 pos += sizes[i]; | |
112 } | |
113 return true; | |
114 } | |
115 | |
116 klassOop symbolKlass::create_klass(TRAPS) { | |
117 symbolKlass o; | |
118 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj()); | |
119 KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL); | |
120 // Make sure size calculation is right | |
121 assert(k()->size() == align_object_size(header_size()), "wrong size for object"); | |
122 // java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror | |
123 return k(); | |
124 } | |
125 | |
126 int symbolKlass::oop_size(oop obj) const { | |
127 assert(obj->is_symbol(),"must be a symbol"); | |
128 symbolOop s = symbolOop(obj); | |
129 int size = s->object_size(); | |
130 return size; | |
131 } | |
132 | |
133 bool symbolKlass::oop_is_parsable(oop obj) const { | |
134 assert(obj->is_symbol(),"must be a symbol"); | |
135 symbolOop s = symbolOop(obj); | |
136 return s->object_is_parsable(); | |
137 } | |
138 | |
139 void symbolKlass::oop_follow_contents(oop obj) { | |
140 assert (obj->is_symbol(), "object must be symbol"); | |
141 // Performance tweak: We skip iterating over the klass pointer since we | |
142 // know that Universe::symbolKlassObj never moves. | |
143 // Note: do not follow next link here (see SymbolTable::follow_contents) | |
144 } | |
145 | |
146 #ifndef SERIALGC | |
147 void symbolKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) { | |
148 assert (obj->is_symbol(), "object must be symbol"); | |
149 // Performance tweak: We skip iterating over the klass pointer since we | |
150 // know that Universe::symbolKlassObj never moves. | |
151 // Note: do not follow next link here (see SymbolTable::follow_contents) | |
152 } | |
153 #endif // SERIALGC | |
154 | |
155 int symbolKlass::oop_oop_iterate(oop obj, OopClosure* blk) { | |
156 assert(obj->is_symbol(), "object must be symbol"); | |
157 symbolOop s = symbolOop(obj); | |
158 // Get size before changing pointers. | |
159 // Don't call size() or oop_size() since that is a virtual call. | |
160 int size = s->object_size(); | |
161 // Performance tweak: We skip iterating over the klass pointer since we | |
162 // know that Universe::symbolKlassObj never moves. | |
163 return size; | |
164 } | |
165 | |
166 | |
167 int symbolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
168 assert(obj->is_symbol(), "object must be symbol"); | |
169 symbolOop s = symbolOop(obj); | |
170 // Get size before changing pointers. | |
171 // Don't call size() or oop_size() since that is a virtual call. | |
172 int size = s->object_size(); | |
173 // Performance tweak: We skip iterating over the klass pointer since we | |
174 // know that Universe::symbolKlassObj never moves. | |
175 return size; | |
176 } | |
177 | |
178 | |
179 int symbolKlass::oop_adjust_pointers(oop obj) { | |
180 assert(obj->is_symbol(), "should be symbol"); | |
181 symbolOop s = symbolOop(obj); | |
182 // Get size before changing pointers. | |
183 // Don't call size() or oop_size() since that is a virtual call. | |
184 int size = s->object_size(); | |
185 // Performance tweak: We skip iterating over the klass pointer since we | |
186 // know that Universe::symbolKlassObj never moves. | |
187 return size; | |
188 } | |
189 | |
190 | |
191 #ifndef SERIALGC | |
192 void symbolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
193 assert(obj->is_symbol(), "should be symbol"); | |
194 } | |
195 | |
196 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
197 assert(obj->is_symbol(), "should be symbol"); | |
198 return symbolOop(obj)->object_size(); | |
199 } | |
200 | |
201 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj, | |
202 HeapWord* beg_addr, HeapWord* end_addr) { | |
203 assert(obj->is_symbol(), "should be symbol"); | |
204 return symbolOop(obj)->object_size(); | |
205 } | |
206 #endif // SERIALGC | |
207 | |
208 #ifndef PRODUCT | |
209 // Printing | |
210 | |
211 void symbolKlass::oop_print_on(oop obj, outputStream* st) { | |
212 st->print("Symbol: '"); | |
222 | 213 symbolOop(obj)->print_symbol_on(st); |
0 | 214 st->print("'"); |
215 } | |
216 | |
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217 #endif //PRODUCT |
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218 |
0 | 219 void symbolKlass::oop_print_value_on(oop obj, outputStream* st) { |
220 symbolOop sym = symbolOop(obj); | |
221 st->print("'"); | |
222 for (int i = 0; i < sym->utf8_length(); i++) { | |
223 st->print("%c", sym->byte_at(i)); | |
224 } | |
225 st->print("'"); | |
226 } | |
227 | |
228 const char* symbolKlass::internal_name() const { | |
229 return "{symbol}"; | |
230 } |