Mercurial > hg > truffle
annotate src/share/vm/classfile/symbolTable.cpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | 94ec88ca68e2 |
children | fc9d8850ab8b |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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/javaClasses.hpp" | |
27 #include "classfile/symbolTable.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "memory/filemap.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "oops/oop.inline.hpp" | |
33 #include "oops/oop.inline2.hpp" | |
34 #include "runtime/mutexLocker.hpp" | |
35 #include "utilities/hashtable.inline.hpp" | |
0 | 36 |
37 // -------------------------------------------------------------------------- | |
38 | |
39 SymbolTable* SymbolTable::_the_table = NULL; | |
40 | |
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41 Symbol* SymbolTable::allocate_symbol(const u1* name, int len, TRAPS) { |
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42 // Don't allow symbols to be created which cannot fit in a Symbol*. |
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43 if (len > Symbol::max_length()) { |
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44 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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45 "name is too long to represent"); |
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46 } |
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47 Symbol* sym = new (len) Symbol(name, len); |
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48 assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted"); |
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49 return sym; |
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50 } |
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51 |
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52 bool SymbolTable::allocate_symbols(int names_count, const u1** names, |
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53 int* lengths, Symbol** syms, TRAPS) { |
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54 for (int i = 0; i< names_count; i++) { |
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55 if (lengths[i] > Symbol::max_length()) { |
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56 THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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57 "name is too long to represent"); |
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58 } |
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59 } |
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60 |
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61 for (int i = 0; i< names_count; i++) { |
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62 int len = lengths[i]; |
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63 syms[i] = new (len) Symbol(names[i], len); |
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64 assert(syms[i] != NULL, "new should call vm_exit_out_of_memory if " |
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65 "C_HEAP is exhausted"); |
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66 } |
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67 return true; |
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68 } |
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69 |
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70 // Call function for all symbols in the symbol table. |
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71 void SymbolTable::symbols_do(SymbolClosure *cl) { |
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72 const int n = the_table()->table_size(); |
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73 for (int i = 0; i < n; i++) { |
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74 for (HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
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75 p != NULL; |
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76 p = p->next()) { |
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77 cl->do_symbol(p->literal_addr()); |
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78 } |
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79 } |
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80 } |
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81 |
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82 int SymbolTable::symbols_removed = 0; |
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83 int SymbolTable::symbols_counted = 0; |
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84 |
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85 // Remove unreferenced symbols from the symbol table |
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86 // This is done late during GC. This doesn't use the hash table unlink because |
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87 // it assumes that the literals are oops. |
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88 void SymbolTable::unlink() { |
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89 int removed = 0; |
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90 int total = 0; |
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91 size_t memory_total = 0; |
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92 for (int i = 0; i < the_table()->table_size(); ++i) { |
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93 for (HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i); *p != NULL; ) { |
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94 HashtableEntry<Symbol*>* entry = *p; |
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95 if (entry->is_shared()) { |
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96 break; |
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97 } |
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98 Symbol* s = entry->literal(); |
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99 memory_total += s->object_size(); |
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100 total++; |
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101 assert(s != NULL, "just checking"); |
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102 // If reference count is zero, remove. |
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103 if (s->refcount() == 0) { |
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104 delete s; |
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105 removed++; |
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106 *p = entry->next(); |
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107 the_table()->free_entry(entry); |
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108 } else { |
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109 p = entry->next_addr(); |
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110 } |
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111 } |
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112 } |
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113 symbols_removed += removed; |
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114 symbols_counted += total; |
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115 // Exclude printing for normal PrintGCDetails because people parse |
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116 // this output. |
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117 if (PrintGCDetails && Verbose && WizardMode) { |
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118 gclog_or_tty->print(" [Symbols=%d size=" SIZE_FORMAT "K] ", total, |
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119 (memory_total*HeapWordSize)/1024); |
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120 } |
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121 } |
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122 |
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123 |
0 | 124 // Lookup a symbol in a bucket. |
125 | |
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126 Symbol* SymbolTable::lookup(int index, const char* name, |
0 | 127 int len, unsigned int hash) { |
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128 for (HashtableEntry<Symbol*>* e = bucket(index); e != NULL; e = e->next()) { |
0 | 129 if (e->hash() == hash) { |
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130 Symbol* sym = e->literal(); |
0 | 131 if (sym->equals(name, len)) { |
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132 // something is referencing this symbol now. |
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133 sym->increment_refcount(); |
0 | 134 return sym; |
135 } | |
136 } | |
137 } | |
138 return NULL; | |
139 } | |
140 | |
141 | |
142 // We take care not to be blocking while holding the | |
143 // SymbolTable_lock. Otherwise, the system might deadlock, since the | |
144 // symboltable is used during compilation (VM_thread) The lock free | |
145 // synchronization is simplified by the fact that we do not delete | |
146 // entries in the symbol table during normal execution (only during | |
147 // safepoints). | |
148 | |
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149 Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) { |
0 | 150 unsigned int hashValue = hash_symbol(name, len); |
151 int index = the_table()->hash_to_index(hashValue); | |
152 | |
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153 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
0 | 154 |
155 // Found | |
156 if (s != NULL) return s; | |
157 | |
158 // Otherwise, add to symbol to table | |
159 return the_table()->basic_add(index, (u1*)name, len, hashValue, CHECK_NULL); | |
160 } | |
161 | |
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162 Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) { |
0 | 163 char* buffer; |
164 int index, len; | |
165 unsigned int hashValue; | |
166 char* name; | |
167 { | |
168 debug_only(No_Safepoint_Verifier nsv;) | |
169 | |
170 name = (char*)sym->base() + begin; | |
171 len = end - begin; | |
172 hashValue = hash_symbol(name, len); | |
173 index = the_table()->hash_to_index(hashValue); | |
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174 Symbol* s = the_table()->lookup(index, name, len, hashValue); |
0 | 175 |
176 // Found | |
177 if (s != NULL) return s; | |
178 } | |
179 | |
180 // Otherwise, add to symbol to table. Copy to a C string first. | |
181 char stack_buf[128]; | |
182 ResourceMark rm(THREAD); | |
183 if (len <= 128) { | |
184 buffer = stack_buf; | |
185 } else { | |
186 buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); | |
187 } | |
188 for (int i=0; i<len; i++) { | |
189 buffer[i] = name[i]; | |
190 } | |
191 // Make sure there is no safepoint in the code above since name can't move. | |
192 // We can't include the code in No_Safepoint_Verifier because of the | |
193 // ResourceMark. | |
194 | |
195 return the_table()->basic_add(index, (u1*)buffer, len, hashValue, CHECK_NULL); | |
196 } | |
197 | |
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198 Symbol* SymbolTable::lookup_only(const char* name, int len, |
0 | 199 unsigned int& hash) { |
200 hash = hash_symbol(name, len); | |
201 int index = the_table()->hash_to_index(hash); | |
202 | |
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203 Symbol* s = the_table()->lookup(index, name, len, hash); |
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204 return s; |
0 | 205 } |
206 | |
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207 // Look up the address of the literal in the SymbolTable for this Symbol* |
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208 // Do not create any new symbols |
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209 // Do not increment the reference count to keep this alive |
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210 Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){ |
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211 unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length()); |
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212 int index = the_table()->hash_to_index(hash); |
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213 |
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214 for (HashtableEntry<Symbol*>* e = the_table()->bucket(index); e != NULL; e = e->next()) { |
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215 if (e->hash() == hash) { |
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216 Symbol* literal_sym = e->literal(); |
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217 if (sym == literal_sym) { |
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218 return e->literal_addr(); |
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219 } |
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220 } |
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221 } |
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222 return NULL; |
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223 } |
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224 |
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225 // Suggestion: Push unicode-based lookup all the way into the hashing |
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226 // and probing logic, so there is no need for convert_to_utf8 until |
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227 // an actual new Symbol* is created. |
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228 Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) { |
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229 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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230 char stack_buf[128]; |
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231 if (utf8_length < (int) sizeof(stack_buf)) { |
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232 char* chars = stack_buf; |
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233 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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234 return lookup(chars, utf8_length, THREAD); |
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235 } else { |
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236 ResourceMark rm(THREAD); |
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237 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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238 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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239 return lookup(chars, utf8_length, THREAD); |
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240 } |
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241 } |
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242 |
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243 Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length, |
665
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244 unsigned int& hash) { |
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245 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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246 char stack_buf[128]; |
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247 if (utf8_length < (int) sizeof(stack_buf)) { |
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248 char* chars = stack_buf; |
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249 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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250 return lookup_only(chars, utf8_length, hash); |
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251 } else { |
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252 ResourceMark rm; |
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253 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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254 UNICODE::convert_to_utf8(name, utf16_length, chars); |
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255 return lookup_only(chars, utf8_length, hash); |
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256 } |
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257 } |
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258 |
0 | 259 void SymbolTable::add(constantPoolHandle cp, int names_count, |
260 const char** names, int* lengths, int* cp_indices, | |
261 unsigned int* hashValues, TRAPS) { | |
262 SymbolTable* table = the_table(); | |
263 bool added = table->basic_add(cp, names_count, names, lengths, | |
264 cp_indices, hashValues, CHECK); | |
265 if (!added) { | |
266 // do it the hard way | |
267 for (int i=0; i<names_count; i++) { | |
268 int index = table->hash_to_index(hashValues[i]); | |
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269 Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i], |
0 | 270 hashValues[i], CHECK); |
271 cp->symbol_at_put(cp_indices[i], sym); | |
272 } | |
273 } | |
274 } | |
275 | |
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276 Symbol* SymbolTable::basic_add(int index, u1 *name, int len, |
0 | 277 unsigned int hashValue, TRAPS) { |
278 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), | |
279 "proposed name of symbol must be stable"); | |
280 | |
281 // We assume that lookup() has been called already, that it failed, | |
282 // and symbol was not found. We create the symbol here. | |
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283 Symbol* sym = allocate_symbol(name, len, CHECK_NULL); |
0 | 284 |
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285 // Allocation must be done before grabbing the SymbolTable_lock lock |
0 | 286 MutexLocker ml(SymbolTable_lock, THREAD); |
287 | |
288 assert(sym->equals((char*)name, len), "symbol must be properly initialized"); | |
289 | |
290 // Since look-up was done lock-free, we need to check if another | |
291 // thread beat us in the race to insert the symbol. | |
292 | |
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293 Symbol* test = lookup(index, (char*)name, len, hashValue); |
0 | 294 if (test != NULL) { |
605 | 295 // A race occurred and another thread introduced the symbol, this one |
0 | 296 // will be dropped and collected. |
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297 delete sym; |
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298 assert(test->refcount() != 0, "lookup should have incremented the count"); |
0 | 299 return test; |
300 } | |
301 | |
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302 HashtableEntry<Symbol*>* entry = new_entry(hashValue, sym); |
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303 sym->increment_refcount(); |
0 | 304 add_entry(index, entry); |
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305 return sym; |
0 | 306 } |
307 | |
308 bool SymbolTable::basic_add(constantPoolHandle cp, int names_count, | |
309 const char** names, int* lengths, | |
310 int* cp_indices, unsigned int* hashValues, | |
311 TRAPS) { | |
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312 Symbol* syms[symbol_alloc_batch_size]; |
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313 bool allocated = allocate_symbols(names_count, (const u1**)names, lengths, |
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314 syms, CHECK_false); |
0 | 315 if (!allocated) { |
316 return false; | |
317 } | |
318 | |
319 // Allocation must be done before grabbing the SymbolTable_lock lock | |
320 MutexLocker ml(SymbolTable_lock, THREAD); | |
321 | |
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322 for (int i=0; i<names_count; i++) { |
0 | 323 assert(syms[i]->equals(names[i], lengths[i]), "symbol must be properly initialized"); |
324 // Since look-up was done lock-free, we need to check if another | |
325 // thread beat us in the race to insert the symbol. | |
326 int index = hash_to_index(hashValues[i]); | |
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327 Symbol* test = lookup(index, names[i], lengths[i], hashValues[i]); |
0 | 328 if (test != NULL) { |
605 | 329 // A race occurred and another thread introduced the symbol, this one |
0 | 330 // will be dropped and collected. Use test instead. |
331 cp->symbol_at_put(cp_indices[i], test); | |
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332 assert(test->refcount() != 0, "lookup should have incremented the count"); |
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333 delete syms[i]; |
0 | 334 } else { |
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335 Symbol* sym = syms[i]; |
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336 HashtableEntry<Symbol*>* entry = new_entry(hashValues[i], sym); |
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337 sym->increment_refcount(); // increment refcount in external hashtable |
0 | 338 add_entry(index, entry); |
339 cp->symbol_at_put(cp_indices[i], sym); | |
340 } | |
341 } | |
342 | |
343 return true; | |
344 } | |
345 | |
346 | |
347 void SymbolTable::verify() { | |
348 for (int i = 0; i < the_table()->table_size(); ++i) { | |
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349 HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
0 | 350 for ( ; p != NULL; p = p->next()) { |
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351 Symbol* s = (Symbol*)(p->literal()); |
0 | 352 guarantee(s != NULL, "symbol is NULL"); |
353 unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length()); | |
354 guarantee(p->hash() == h, "broken hash in symbol table entry"); | |
355 guarantee(the_table()->hash_to_index(h) == i, | |
356 "wrong index in symbol table"); | |
357 } | |
358 } | |
359 } | |
360 | |
361 | |
362 //--------------------------------------------------------------------------- | |
363 // Non-product code | |
364 | |
365 #ifndef PRODUCT | |
366 | |
367 void SymbolTable::print_histogram() { | |
368 MutexLocker ml(SymbolTable_lock); | |
369 const int results_length = 100; | |
370 int results[results_length]; | |
371 int i,j; | |
372 | |
373 // initialize results to zero | |
374 for (j = 0; j < results_length; j++) { | |
375 results[j] = 0; | |
376 } | |
377 | |
378 int total = 0; | |
379 int max_symbols = 0; | |
380 int out_of_range = 0; | |
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381 int memory_total = 0; |
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382 int count = 0; |
0 | 383 for (i = 0; i < the_table()->table_size(); i++) { |
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384 HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
0 | 385 for ( ; p != NULL; p = p->next()) { |
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386 memory_total += p->literal()->object_size(); |
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387 count++; |
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388 int counter = p->literal()->utf8_length(); |
0 | 389 total += counter; |
390 if (counter < results_length) { | |
391 results[counter]++; | |
392 } else { | |
393 out_of_range++; | |
394 } | |
395 max_symbols = MAX2(max_symbols, counter); | |
396 } | |
397 } | |
398 tty->print_cr("Symbol Table:"); | |
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399 tty->print_cr("Total number of symbols %5d", count); |
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400 tty->print_cr("Total size in memory %5dK", |
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401 (memory_total*HeapWordSize)/1024); |
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402 tty->print_cr("Total counted %5d", symbols_counted); |
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403 tty->print_cr("Total removed %5d", symbols_removed); |
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404 if (symbols_counted > 0) { |
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405 tty->print_cr("Percent removed %3.2f", |
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406 ((float)symbols_removed/(float)symbols_counted)* 100); |
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407 } |
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408 tty->print_cr("Reference counts %5d", Symbol::_total_count); |
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409 tty->print_cr("Histogram of symbol length:"); |
0 | 410 tty->print_cr("%8s %5d", "Total ", total); |
411 tty->print_cr("%8s %5d", "Maximum", max_symbols); | |
412 tty->print_cr("%8s %3.2f", "Average", | |
413 ((float) total / (float) the_table()->table_size())); | |
414 tty->print_cr("%s", "Histogram:"); | |
415 tty->print_cr(" %s %29s", "Length", "Number chains that length"); | |
416 for (i = 0; i < results_length; i++) { | |
417 if (results[i] > 0) { | |
418 tty->print_cr("%6d %10d", i, results[i]); | |
419 } | |
420 } | |
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421 if (Verbose) { |
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422 int line_length = 70; |
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423 tty->print_cr("%s %30s", " Length", "Number chains that length"); |
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424 for (i = 0; i < results_length; i++) { |
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425 if (results[i] > 0) { |
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426 tty->print("%4d", i); |
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427 for (j = 0; (j < results[i]) && (j < line_length); j++) { |
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428 tty->print("%1s", "*"); |
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429 } |
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430 if (j == line_length) { |
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431 tty->print("%1s", "+"); |
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432 } |
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433 tty->cr(); |
0 | 434 } |
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435 } |
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436 } |
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437 tty->print_cr(" %s %d: %d\n", "Number chains longer than", |
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438 results_length, out_of_range); |
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439 } |
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440 |
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441 void SymbolTable::print() { |
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442 for (int i = 0; i < the_table()->table_size(); ++i) { |
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443 HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i); |
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444 HashtableEntry<Symbol*>* entry = the_table()->bucket(i); |
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445 if (entry != NULL) { |
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446 while (entry != NULL) { |
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447 tty->print(PTR_FORMAT " ", entry->literal()); |
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448 entry->literal()->print(); |
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449 tty->print(" %d", entry->literal()->refcount()); |
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450 p = entry->next_addr(); |
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451 entry = (HashtableEntry<Symbol*>*)HashtableEntry<Symbol*>::make_ptr(*p); |
0 | 452 } |
453 tty->cr(); | |
454 } | |
455 } | |
456 } | |
457 | |
458 #endif // PRODUCT | |
459 | |
460 // -------------------------------------------------------------------------- | |
461 | |
462 #ifdef ASSERT | |
463 class StableMemoryChecker : public StackObj { | |
464 enum { _bufsize = wordSize*4 }; | |
465 | |
466 address _region; | |
467 jint _size; | |
468 u1 _save_buf[_bufsize]; | |
469 | |
470 int sample(u1* save_buf) { | |
471 if (_size <= _bufsize) { | |
472 memcpy(save_buf, _region, _size); | |
473 return _size; | |
474 } else { | |
475 // copy head and tail | |
476 memcpy(&save_buf[0], _region, _bufsize/2); | |
477 memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2); | |
478 return (_bufsize/2)*2; | |
479 } | |
480 } | |
481 | |
482 public: | |
483 StableMemoryChecker(const void* region, jint size) { | |
484 _region = (address) region; | |
485 _size = size; | |
486 sample(_save_buf); | |
487 } | |
488 | |
489 bool verify() { | |
490 u1 check_buf[sizeof(_save_buf)]; | |
491 int check_size = sample(check_buf); | |
492 return (0 == memcmp(_save_buf, check_buf, check_size)); | |
493 } | |
494 | |
495 void set_region(const void* region) { _region = (address) region; } | |
496 }; | |
497 #endif | |
498 | |
499 | |
500 // -------------------------------------------------------------------------- | |
501 StringTable* StringTable::_the_table = NULL; | |
502 | |
503 oop StringTable::lookup(int index, jchar* name, | |
504 int len, unsigned int hash) { | |
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505 for (HashtableEntry<oop>* l = bucket(index); l != NULL; l = l->next()) { |
0 | 506 if (l->hash() == hash) { |
507 if (java_lang_String::equals(l->literal(), name, len)) { | |
508 return l->literal(); | |
509 } | |
510 } | |
511 } | |
512 return NULL; | |
513 } | |
514 | |
515 | |
516 oop StringTable::basic_add(int index, Handle string_or_null, jchar* name, | |
517 int len, unsigned int hashValue, TRAPS) { | |
518 debug_only(StableMemoryChecker smc(name, len * sizeof(name[0]))); | |
519 assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), | |
520 "proposed name of symbol must be stable"); | |
521 | |
522 Handle string; | |
523 // try to reuse the string if possible | |
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524 if (!string_or_null.is_null() && (!JavaObjectsInPerm || string_or_null()->is_perm())) { |
0 | 525 string = string_or_null; |
526 } else { | |
527 string = java_lang_String::create_tenured_from_unicode(name, len, CHECK_NULL); | |
528 } | |
529 | |
530 // Allocation must be done before grapping the SymbolTable_lock lock | |
531 MutexLocker ml(StringTable_lock, THREAD); | |
532 | |
533 assert(java_lang_String::equals(string(), name, len), | |
534 "string must be properly initialized"); | |
535 | |
536 // Since look-up was done lock-free, we need to check if another | |
537 // thread beat us in the race to insert the symbol. | |
538 | |
539 oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int) | |
540 if (test != NULL) { | |
541 // Entry already added | |
542 return test; | |
543 } | |
544 | |
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545 HashtableEntry<oop>* entry = new_entry(hashValue, string()); |
0 | 546 add_entry(index, entry); |
547 return string(); | |
548 } | |
549 | |
550 | |
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551 oop StringTable::lookup(Symbol* symbol) { |
0 | 552 ResourceMark rm; |
553 int length; | |
554 jchar* chars = symbol->as_unicode(length); | |
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555 unsigned int hashValue = java_lang_String::hash_string(chars, length); |
0 | 556 int index = the_table()->hash_to_index(hashValue); |
557 return the_table()->lookup(index, chars, length, hashValue); | |
558 } | |
559 | |
560 | |
561 oop StringTable::intern(Handle string_or_null, jchar* name, | |
562 int len, TRAPS) { | |
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563 unsigned int hashValue = java_lang_String::hash_string(name, len); |
0 | 564 int index = the_table()->hash_to_index(hashValue); |
565 oop string = the_table()->lookup(index, name, len, hashValue); | |
566 | |
567 // Found | |
568 if (string != NULL) return string; | |
569 | |
570 // Otherwise, add to symbol to table | |
571 return the_table()->basic_add(index, string_or_null, name, len, | |
572 hashValue, CHECK_NULL); | |
573 } | |
574 | |
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575 oop StringTable::intern(Symbol* symbol, TRAPS) { |
0 | 576 if (symbol == NULL) return NULL; |
577 ResourceMark rm(THREAD); | |
578 int length; | |
579 jchar* chars = symbol->as_unicode(length); | |
580 Handle string; | |
581 oop result = intern(string, chars, length, CHECK_NULL); | |
582 return result; | |
583 } | |
584 | |
585 | |
586 oop StringTable::intern(oop string, TRAPS) | |
587 { | |
588 if (string == NULL) return NULL; | |
589 ResourceMark rm(THREAD); | |
590 int length; | |
591 Handle h_string (THREAD, string); | |
592 jchar* chars = java_lang_String::as_unicode_string(string, length); | |
593 oop result = intern(h_string, chars, length, CHECK_NULL); | |
594 return result; | |
595 } | |
596 | |
597 | |
598 oop StringTable::intern(const char* utf8_string, TRAPS) { | |
599 if (utf8_string == NULL) return NULL; | |
600 ResourceMark rm(THREAD); | |
601 int length = UTF8::unicode_length(utf8_string); | |
602 jchar* chars = NEW_RESOURCE_ARRAY(jchar, length); | |
603 UTF8::convert_to_unicode(utf8_string, chars, length); | |
604 Handle string; | |
605 oop result = intern(string, chars, length, CHECK_NULL); | |
606 return result; | |
607 } | |
608 | |
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609 void StringTable::unlink(BoolObjectClosure* is_alive) { |
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610 // Readers of the table are unlocked, so we should only be removing |
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611 // entries at a safepoint. |
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612 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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613 for (int i = 0; i < the_table()->table_size(); ++i) { |
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614 for (HashtableEntry<oop>** p = the_table()->bucket_addr(i); *p != NULL; ) { |
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615 HashtableEntry<oop>* entry = *p; |
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616 if (entry->is_shared()) { |
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617 break; |
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618 } |
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619 assert(entry->literal() != NULL, "just checking"); |
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620 if (is_alive->do_object_b(entry->literal())) { |
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621 p = entry->next_addr(); |
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622 } else { |
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623 *p = entry->next(); |
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624 the_table()->free_entry(entry); |
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625 } |
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626 } |
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627 } |
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628 } |
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629 |
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630 void StringTable::oops_do(OopClosure* f) { |
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631 for (int i = 0; i < the_table()->table_size(); ++i) { |
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632 HashtableEntry<oop>** p = the_table()->bucket_addr(i); |
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633 HashtableEntry<oop>* entry = the_table()->bucket(i); |
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634 while (entry != NULL) { |
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635 f->do_oop((oop*)entry->literal_addr()); |
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636 |
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637 // Did the closure remove the literal from the table? |
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638 if (entry->literal() == NULL) { |
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639 assert(!entry->is_shared(), "immutable hashtable entry?"); |
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640 *p = entry->next(); |
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641 the_table()->free_entry(entry); |
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642 } else { |
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643 p = entry->next_addr(); |
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644 } |
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645 entry = (HashtableEntry<oop>*)HashtableEntry<oop>::make_ptr(*p); |
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646 } |
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647 } |
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648 } |
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649 |
0 | 650 void StringTable::verify() { |
651 for (int i = 0; i < the_table()->table_size(); ++i) { | |
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652 HashtableEntry<oop>* p = the_table()->bucket(i); |
0 | 653 for ( ; p != NULL; p = p->next()) { |
654 oop s = p->literal(); | |
655 guarantee(s != NULL, "interned string is NULL"); | |
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656 guarantee(s->is_perm() || !JavaObjectsInPerm, "interned string not in permspace"); |
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657 unsigned int h = java_lang_String::hash_string(s); |
0 | 658 guarantee(p->hash() == h, "broken hash in string table entry"); |
659 guarantee(the_table()->hash_to_index(h) == i, | |
660 "wrong index in string table"); | |
661 } | |
662 } | |
663 } |