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annotate src/share/vm/classfile/symbolTable.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 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 #ifndef SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |
| 26 #define SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP | |
| 27 | |
| 28 #include "memory/allocation.inline.hpp" | |
| 29 #include "oops/symbolOop.hpp" | |
| 30 #include "utilities/hashtable.hpp" | |
| 31 | |
| 0 | 32 // The symbol table holds all symbolOops and corresponding interned strings. |
| 33 // symbolOops and literal strings should be canonicalized. | |
| 34 // | |
| 35 // The interned strings are created lazily. | |
| 36 // | |
| 37 // It is implemented as an open hash table with a fixed number of buckets. | |
| 38 // | |
| 39 // %note: | |
| 40 // - symbolTableEntrys are allocated in blocks to reduce the space overhead. | |
| 41 | |
| 42 class BoolObjectClosure; | |
| 43 | |
| 44 | |
| 45 class SymbolTable : public Hashtable { | |
| 46 friend class VMStructs; | |
| 47 | |
| 48 private: | |
| 49 // The symbol table | |
| 50 static SymbolTable* _the_table; | |
| 51 | |
| 52 // Adding elements | |
| 53 symbolOop basic_add(int index, u1* name, int len, | |
| 54 unsigned int hashValue, TRAPS); | |
| 55 bool basic_add(constantPoolHandle cp, int names_count, | |
| 56 const char** names, int* lengths, int* cp_indices, | |
| 57 unsigned int* hashValues, TRAPS); | |
| 58 | |
| 59 // Table size | |
| 60 enum { | |
| 61 symbol_table_size = 20011 | |
| 62 }; | |
| 63 | |
| 64 symbolOop lookup(int index, const char* name, int len, unsigned int hash); | |
| 65 | |
| 66 SymbolTable() | |
| 67 : Hashtable(symbol_table_size, sizeof (HashtableEntry)) {} | |
| 68 | |
| 69 SymbolTable(HashtableBucket* t, int number_of_entries) | |
| 70 : Hashtable(symbol_table_size, sizeof (HashtableEntry), t, | |
| 71 number_of_entries) {} | |
| 72 | |
| 73 | |
| 74 public: | |
| 75 enum { | |
| 76 symbol_alloc_batch_size = 8 | |
| 77 }; | |
| 78 | |
| 79 // The symbol table | |
| 80 static SymbolTable* the_table() { return _the_table; } | |
| 81 | |
| 82 static void create_table() { | |
| 83 assert(_the_table == NULL, "One symbol table allowed."); | |
| 84 _the_table = new SymbolTable(); | |
| 85 } | |
| 86 | |
| 87 static void create_table(HashtableBucket* t, int length, | |
| 88 int number_of_entries) { | |
| 89 assert(_the_table == NULL, "One symbol table allowed."); | |
| 90 assert(length == symbol_table_size * sizeof(HashtableBucket), | |
| 91 "bad shared symbol size."); | |
| 92 _the_table = new SymbolTable(t, number_of_entries); | |
| 93 } | |
| 94 | |
| 95 static symbolOop lookup(const char* name, int len, TRAPS); | |
| 96 // lookup only, won't add. Also calculate hash. | |
| 97 static symbolOop lookup_only(const char* name, int len, unsigned int& hash); | |
| 98 // Only copy to C string to be added if lookup failed. | |
| 99 static symbolOop lookup(symbolHandle sym, int begin, int end, TRAPS); | |
| 100 | |
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101 // jchar (utf16) version of lookups |
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102 static symbolOop lookup_unicode(const jchar* name, int len, TRAPS); |
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103 static symbolOop lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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104 |
| 0 | 105 static void add(constantPoolHandle cp, int names_count, |
| 106 const char** names, int* lengths, int* cp_indices, | |
| 107 unsigned int* hashValues, TRAPS); | |
| 108 | |
| 109 // GC support | |
| 110 // Delete pointers to otherwise-unreachable objects. | |
| 111 static void unlink(BoolObjectClosure* cl) { | |
| 112 the_table()->Hashtable::unlink(cl); | |
| 113 } | |
| 114 | |
| 115 // Invoke "f->do_oop" on the locations of all oops in the table. | |
| 116 static void oops_do(OopClosure* f) { | |
| 117 the_table()->Hashtable::oops_do(f); | |
| 118 } | |
| 119 | |
| 120 // Symbol lookup | |
| 121 static symbolOop lookup(int index, const char* name, int len, TRAPS); | |
| 122 | |
| 123 // Needed for preloading classes in signatures when compiling. | |
| 124 // Returns the symbol is already present in symbol table, otherwise | |
| 125 // NULL. NO ALLOCATION IS GUARANTEED! | |
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126 static symbolOop probe(const char* name, int len) { |
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127 unsigned int ignore_hash; |
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128 return lookup_only(name, len, ignore_hash); |
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129 } |
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130 static symbolOop probe_unicode(const jchar* name, int len) { |
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131 unsigned int ignore_hash; |
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132 return lookup_only_unicode(name, len, ignore_hash); |
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133 } |
| 0 | 134 |
| 135 // Histogram | |
| 136 static void print_histogram() PRODUCT_RETURN; | |
| 137 | |
| 138 // Debugging | |
| 139 static void verify(); | |
| 140 | |
| 141 // Sharing | |
| 142 static void copy_buckets(char** top, char*end) { | |
| 143 the_table()->Hashtable::copy_buckets(top, end); | |
| 144 } | |
| 145 static void copy_table(char** top, char*end) { | |
| 146 the_table()->Hashtable::copy_table(top, end); | |
| 147 } | |
| 148 static void reverse(void* boundary = NULL) { | |
| 149 ((Hashtable*)the_table())->reverse(boundary); | |
| 150 } | |
| 151 }; | |
| 152 | |
| 153 | |
| 154 class StringTable : public Hashtable { | |
| 155 friend class VMStructs; | |
| 156 | |
| 157 private: | |
| 158 // The string table | |
| 159 static StringTable* _the_table; | |
| 160 | |
| 161 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS); | |
| 162 oop basic_add(int index, Handle string_or_null, jchar* name, int len, | |
| 163 unsigned int hashValue, TRAPS); | |
| 164 | |
| 165 // Table size | |
| 166 enum { | |
| 167 string_table_size = 1009 | |
| 168 }; | |
| 169 | |
| 170 oop lookup(int index, jchar* chars, int length, unsigned int hashValue); | |
| 171 | |
| 172 StringTable() : Hashtable(string_table_size, sizeof (HashtableEntry)) {} | |
| 173 | |
| 174 StringTable(HashtableBucket* t, int number_of_entries) | |
| 175 : Hashtable(string_table_size, sizeof (HashtableEntry), t, | |
| 176 number_of_entries) {} | |
| 177 | |
| 178 public: | |
| 179 // The string table | |
| 180 static StringTable* the_table() { return _the_table; } | |
| 181 | |
| 182 static void create_table() { | |
| 183 assert(_the_table == NULL, "One string table allowed."); | |
| 184 _the_table = new StringTable(); | |
| 185 } | |
| 186 | |
| 187 static void create_table(HashtableBucket* t, int length, | |
| 188 int number_of_entries) { | |
| 189 assert(_the_table == NULL, "One string table allowed."); | |
| 190 assert(length == string_table_size * sizeof(HashtableBucket), | |
| 191 "bad shared string size."); | |
| 192 _the_table = new StringTable(t, number_of_entries); | |
| 193 } | |
| 194 | |
| 195 | |
| 196 static int hash_string(jchar* s, int len); | |
| 197 | |
| 198 | |
| 199 // GC support | |
| 200 // Delete pointers to otherwise-unreachable objects. | |
| 201 static void unlink(BoolObjectClosure* cl) { | |
| 202 the_table()->Hashtable::unlink(cl); | |
| 203 } | |
| 204 | |
| 205 // Invoke "f->do_oop" on the locations of all oops in the table. | |
| 206 static void oops_do(OopClosure* f) { | |
| 207 the_table()->Hashtable::oops_do(f); | |
| 208 } | |
| 209 | |
| 210 // Probing | |
| 211 static oop lookup(symbolOop symbol); | |
| 212 | |
| 213 // Interning | |
| 214 static oop intern(symbolOop symbol, TRAPS); | |
| 215 static oop intern(oop string, TRAPS); | |
| 216 static oop intern(const char *utf8_string, TRAPS); | |
| 217 | |
| 218 // Debugging | |
| 219 static void verify(); | |
| 220 | |
| 221 // Sharing | |
| 222 static void copy_buckets(char** top, char*end) { | |
| 223 the_table()->Hashtable::copy_buckets(top, end); | |
| 224 } | |
| 225 static void copy_table(char** top, char*end) { | |
| 226 the_table()->Hashtable::copy_table(top, end); | |
| 227 } | |
| 228 static void reverse() { | |
| 229 ((BasicHashtable*)the_table())->reverse(); | |
| 230 } | |
| 231 }; | |
| 1972 | 232 |
| 233 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |