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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The symbol table holds all symbolOops and corresponding interned strings.
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26 // symbolOops and literal strings should be canonicalized.
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27 //
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28 // The interned strings are created lazily.
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29 //
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30 // It is implemented as an open hash table with a fixed number of buckets.
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31 //
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32 // %note:
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33 // - symbolTableEntrys are allocated in blocks to reduce the space overhead.
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34
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35 class BoolObjectClosure;
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36
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37
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38 class SymbolTable : public Hashtable {
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39 friend class VMStructs;
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40
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41 private:
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42 // The symbol table
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43 static SymbolTable* _the_table;
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44
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45 // Adding elements
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46 symbolOop basic_add(int index, u1* name, int len,
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47 unsigned int hashValue, TRAPS);
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48 bool basic_add(constantPoolHandle cp, int names_count,
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49 const char** names, int* lengths, int* cp_indices,
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50 unsigned int* hashValues, TRAPS);
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51
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52 // Table size
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53 enum {
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54 symbol_table_size = 20011
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55 };
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56
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57 symbolOop lookup(int index, const char* name, int len, unsigned int hash);
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58
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59 SymbolTable()
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60 : Hashtable(symbol_table_size, sizeof (HashtableEntry)) {}
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61
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62 SymbolTable(HashtableBucket* t, int number_of_entries)
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63 : Hashtable(symbol_table_size, sizeof (HashtableEntry), t,
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64 number_of_entries) {}
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65
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66
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67 public:
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68 enum {
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69 symbol_alloc_batch_size = 8
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70 };
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71
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72 // The symbol table
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73 static SymbolTable* the_table() { return _the_table; }
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74
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75 static void create_table() {
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76 assert(_the_table == NULL, "One symbol table allowed.");
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77 _the_table = new SymbolTable();
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78 }
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79
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80 static void create_table(HashtableBucket* t, int length,
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81 int number_of_entries) {
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82 assert(_the_table == NULL, "One symbol table allowed.");
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83 assert(length == symbol_table_size * sizeof(HashtableBucket),
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84 "bad shared symbol size.");
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85 _the_table = new SymbolTable(t, number_of_entries);
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86 }
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87
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88 static symbolOop lookup(const char* name, int len, TRAPS);
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89 // lookup only, won't add. Also calculate hash.
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90 static symbolOop lookup_only(const char* name, int len, unsigned int& hash);
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91 // Only copy to C string to be added if lookup failed.
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92 static symbolOop lookup(symbolHandle sym, int begin, int end, TRAPS);
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93
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94 static void add(constantPoolHandle cp, int names_count,
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95 const char** names, int* lengths, int* cp_indices,
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96 unsigned int* hashValues, TRAPS);
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97
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98 // GC support
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99 // Delete pointers to otherwise-unreachable objects.
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100 static void unlink(BoolObjectClosure* cl) {
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101 the_table()->Hashtable::unlink(cl);
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102 }
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103
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104 // Invoke "f->do_oop" on the locations of all oops in the table.
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105 static void oops_do(OopClosure* f) {
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106 the_table()->Hashtable::oops_do(f);
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107 }
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108
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109 // Symbol lookup
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110 static symbolOop lookup(int index, const char* name, int len, TRAPS);
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111
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112 // Needed for preloading classes in signatures when compiling.
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113 // Returns the symbol is already present in symbol table, otherwise
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114 // NULL. NO ALLOCATION IS GUARANTEED!
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115 static symbolOop probe(const char* name, int len);
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116
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117 // Histogram
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118 static void print_histogram() PRODUCT_RETURN;
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119
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120 // Debugging
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121 static void verify();
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122
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123 // Sharing
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124 static void copy_buckets(char** top, char*end) {
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125 the_table()->Hashtable::copy_buckets(top, end);
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126 }
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127 static void copy_table(char** top, char*end) {
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128 the_table()->Hashtable::copy_table(top, end);
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129 }
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130 static void reverse(void* boundary = NULL) {
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131 ((Hashtable*)the_table())->reverse(boundary);
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132 }
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133 };
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134
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135
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136 class StringTable : public Hashtable {
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137 friend class VMStructs;
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138
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139 private:
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140 // The string table
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141 static StringTable* _the_table;
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142
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143 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS);
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144 oop basic_add(int index, Handle string_or_null, jchar* name, int len,
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145 unsigned int hashValue, TRAPS);
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146
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147 // Table size
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148 enum {
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149 string_table_size = 1009
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150 };
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151
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152 oop lookup(int index, jchar* chars, int length, unsigned int hashValue);
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153
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154 StringTable() : Hashtable(string_table_size, sizeof (HashtableEntry)) {}
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155
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156 StringTable(HashtableBucket* t, int number_of_entries)
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157 : Hashtable(string_table_size, sizeof (HashtableEntry), t,
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158 number_of_entries) {}
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159
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160 public:
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161 // The string table
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162 static StringTable* the_table() { return _the_table; }
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163
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164 static void create_table() {
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165 assert(_the_table == NULL, "One string table allowed.");
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166 _the_table = new StringTable();
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167 }
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168
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169 static void create_table(HashtableBucket* t, int length,
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170 int number_of_entries) {
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171 assert(_the_table == NULL, "One string table allowed.");
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172 assert(length == string_table_size * sizeof(HashtableBucket),
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173 "bad shared string size.");
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174 _the_table = new StringTable(t, number_of_entries);
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175 }
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176
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177
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178 static int hash_string(jchar* s, int len);
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179
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180
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181 // GC support
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182 // Delete pointers to otherwise-unreachable objects.
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183 static void unlink(BoolObjectClosure* cl) {
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184 the_table()->Hashtable::unlink(cl);
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185 }
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186
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187 // Invoke "f->do_oop" on the locations of all oops in the table.
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188 static void oops_do(OopClosure* f) {
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189 the_table()->Hashtable::oops_do(f);
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190 }
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191
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192 // Probing
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193 static oop lookup(symbolOop symbol);
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194
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195 // Interning
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196 static oop intern(symbolOop symbol, TRAPS);
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197 static oop intern(oop string, TRAPS);
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198 static oop intern(const char *utf8_string, TRAPS);
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199
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200 // Debugging
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201 static void verify();
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202
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203 // Sharing
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204 static void copy_buckets(char** top, char*end) {
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205 the_table()->Hashtable::copy_buckets(top, end);
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206 }
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207 static void copy_table(char** top, char*end) {
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208 the_table()->Hashtable::copy_table(top, end);
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209 }
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210 static void reverse() {
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211 ((BasicHashtable*)the_table())->reverse();
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212 }
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213 };
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