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1 /*
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2 * Copyright 1997-2007 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 // A constantPool is an array containing class constants as described in the
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26 // class file.
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27 //
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28 // Most of the constant pool entries are written during class parsing, which
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29 // is safe. For klass and string types, the constant pool entry is
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30 // modified when the entry is resolved. If a klass or string constant pool
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31 // entry is read without a lock, only the resolved state guarantees that
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32 // the entry in the constant pool is a klass or String object and
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33 // not a symbolOop.
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34
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35 class SymbolHashMap;
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36
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37 class constantPoolOopDesc : public arrayOopDesc {
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38 friend class VMStructs;
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39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
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40 private:
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41 typeArrayOop _tags; // the tag array describing the constant pool's contents
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42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information
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43 klassOop _pool_holder; // the corresponding class
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44 // only set to non-zero if constant pool is merged by RedefineClasses
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45 int _orig_length;
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46
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47 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); }
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48 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); }
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49 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); }
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50
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51 private:
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52 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); }
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53 oop* tags_addr() { return (oop*)&_tags; }
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54 oop* cache_addr() { return (oop*)&_cache; }
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55
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56 oop* obj_at_addr(int which) const {
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57 assert(is_within_bounds(which), "index out of bounds");
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58 return (oop*) &base()[which];
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59 }
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60
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61 jint* int_at_addr(int which) const {
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62 assert(is_within_bounds(which), "index out of bounds");
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63 return (jint*) &base()[which];
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64 }
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65
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66 jlong* long_at_addr(int which) const {
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67 assert(is_within_bounds(which), "index out of bounds");
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68 return (jlong*) &base()[which];
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69 }
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70
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71 jfloat* float_at_addr(int which) const {
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72 assert(is_within_bounds(which), "index out of bounds");
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73 return (jfloat*) &base()[which];
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74 }
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75
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76 jdouble* double_at_addr(int which) const {
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77 assert(is_within_bounds(which), "index out of bounds");
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78 return (jdouble*) &base()[which];
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79 }
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80
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81 public:
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82 typeArrayOop tags() const { return _tags; }
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83
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84 // Klass holding pool
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85 klassOop pool_holder() const { return _pool_holder; }
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86 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); }
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87 oop* pool_holder_addr() { return (oop*)&_pool_holder; }
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88
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89 // Interpreter runtime support
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90 constantPoolCacheOop cache() const { return _cache; }
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91 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); }
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92
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93 // Assembly code support
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94 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); }
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95 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); }
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96 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); }
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97
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98 // Storing constants
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99
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100 void klass_at_put(int which, klassOop k) {
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101 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
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102 // The interpreter assumes when the tag is stored, the klass is resolved
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103 // and the klassOop is a klass rather than a symbolOop, so we need
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104 // hardware store ordering here.
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105 release_tag_at_put(which, JVM_CONSTANT_Class);
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106 if (UseConcMarkSweepGC) {
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107 // In case the earlier card-mark was consumed by a concurrent
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108 // marking thread before the tag was updated, redirty the card.
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109 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
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110 }
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111 }
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112
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113 // For temporary use while constructing constant pool
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114 void klass_index_at_put(int which, int name_index) {
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115 tag_at_put(which, JVM_CONSTANT_ClassIndex);
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116 *int_at_addr(which) = name_index;
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117 }
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118
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119 // Temporary until actual use
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120 void unresolved_klass_at_put(int which, symbolOop s) {
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121 // Overwrite the old index with a GC friendly value so
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122 // that if GC looks during the transition it won't try
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123 // to treat a small integer as oop.
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124 *obj_at_addr(which) = NULL;
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125 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
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126 oop_store_without_check(obj_at_addr(which), oop(s));
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127 }
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128
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129 // Temporary until actual use
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130 void unresolved_string_at_put(int which, symbolOop s) {
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131 *obj_at_addr(which) = NULL;
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132 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString);
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133 oop_store_without_check(obj_at_addr(which), oop(s));
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134 }
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135
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136 void int_at_put(int which, jint i) {
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137 tag_at_put(which, JVM_CONSTANT_Integer);
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138 *int_at_addr(which) = i;
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139 }
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140
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141 void long_at_put(int which, jlong l) {
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142 tag_at_put(which, JVM_CONSTANT_Long);
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143 // *long_at_addr(which) = l;
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144 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
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145 }
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146
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147 void float_at_put(int which, jfloat f) {
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148 tag_at_put(which, JVM_CONSTANT_Float);
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149 *float_at_addr(which) = f;
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150 }
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151
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152 void double_at_put(int which, jdouble d) {
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153 tag_at_put(which, JVM_CONSTANT_Double);
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154 // *double_at_addr(which) = d;
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155 // u8 temp = *(u8*) &d;
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156 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
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157 }
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158
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159 void symbol_at_put(int which, symbolOop s) {
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160 tag_at_put(which, JVM_CONSTANT_Utf8);
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161 oop_store_without_check(obj_at_addr(which), oop(s));
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162 }
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163
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164 void string_at_put(int which, oop str) {
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165 oop_store((volatile oop*)obj_at_addr(which), str);
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166 release_tag_at_put(which, JVM_CONSTANT_String);
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167 if (UseConcMarkSweepGC) {
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168 // In case the earlier card-mark was consumed by a concurrent
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169 // marking thread before the tag was updated, redirty the card.
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170 oop_store_without_check((volatile oop *)obj_at_addr(which), str);
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171 }
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172 }
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173
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174 // For temporary use while constructing constant pool
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175 void string_index_at_put(int which, int string_index) {
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176 tag_at_put(which, JVM_CONSTANT_StringIndex);
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177 *int_at_addr(which) = string_index;
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178 }
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179
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180 void field_at_put(int which, int class_index, int name_and_type_index) {
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181 tag_at_put(which, JVM_CONSTANT_Fieldref);
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182 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
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183 }
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184
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185 void method_at_put(int which, int class_index, int name_and_type_index) {
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186 tag_at_put(which, JVM_CONSTANT_Methodref);
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187 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
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188 }
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189
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190 void interface_method_at_put(int which, int class_index, int name_and_type_index) {
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191 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
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192 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice
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193 }
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194
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195 void name_and_type_at_put(int which, int name_index, int signature_index) {
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196 tag_at_put(which, JVM_CONSTANT_NameAndType);
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197 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice
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198 }
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199
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200 // Tag query
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201
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202 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); }
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203
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204 // Whether the entry is a pointer that must be GC'd.
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205 bool is_pointer_entry(int which) {
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206 constantTag tag = tag_at(which);
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207 return tag.is_klass() ||
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208 tag.is_unresolved_klass() ||
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209 tag.is_symbol() ||
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210 tag.is_unresolved_string() ||
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211 tag.is_string();
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212 }
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213
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214 // Fetching constants
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215
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216 klassOop klass_at(int which, TRAPS) {
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217 constantPoolHandle h_this(THREAD, this);
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218 return klass_at_impl(h_this, which, CHECK_NULL);
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219 }
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220
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221 symbolOop klass_name_at(int which); // Returns the name, w/o resolving.
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222
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223 klassOop resolved_klass_at(int which) { // Used by Compiler
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224 guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
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225 // Must do an acquire here in case another thread resolved the klass
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226 // behind our back, lest we later load stale values thru the oop.
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227 return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
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228 }
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229
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230 // This method should only be used with a cpool lock or during parsing or gc
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231 symbolOop unresolved_klass_at(int which) { // Temporary until actual use
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232 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
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233 // check that the klass is still unresolved.
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234 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
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235 return s;
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236 }
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237
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238 // RedefineClasses() API support:
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239 symbolOop klass_at_noresolve(int which) { return klass_name_at(which); }
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240
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241 jint int_at(int which) {
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242 assert(tag_at(which).is_int(), "Corrupted constant pool");
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243 return *int_at_addr(which);
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244 }
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245
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246 jlong long_at(int which) {
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247 assert(tag_at(which).is_long(), "Corrupted constant pool");
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248 // return *long_at_addr(which);
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249 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
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250 return *((jlong*)&tmp);
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251 }
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252
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253 jfloat float_at(int which) {
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254 assert(tag_at(which).is_float(), "Corrupted constant pool");
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255 return *float_at_addr(which);
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256 }
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257
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258 jdouble double_at(int which) {
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259 assert(tag_at(which).is_double(), "Corrupted constant pool");
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260 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
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261 return *((jdouble*)&tmp);
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262 }
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263
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264 symbolOop symbol_at(int which) {
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265 assert(tag_at(which).is_utf8(), "Corrupted constant pool");
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266 return symbolOop(*obj_at_addr(which));
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267 }
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268
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269 oop string_at(int which, TRAPS) {
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270 constantPoolHandle h_this(THREAD, this);
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271 return string_at_impl(h_this, which, CHECK_NULL);
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272 }
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273
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274 // only called when we are sure a string entry is already resolved (via an
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275 // earlier string_at call.
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276 oop resolved_string_at(int which) {
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277 assert(tag_at(which).is_string(), "Corrupted constant pool");
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278 // Must do an acquire here in case another thread resolved the klass
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279 // behind our back, lest we later load stale values thru the oop.
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280 return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which));
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281 }
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282
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283 // This method should only be used with a cpool lock or during parsing or gc
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284 symbolOop unresolved_string_at(int which) { // Temporary until actual use
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285 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
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286 // check that the string is still unresolved.
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287 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool");
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288 return s;
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289 }
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290
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291 // Returns an UTF8 for a CONSTANT_String entry at a given index.
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292 // UTF8 char* representation was chosen to avoid conversion of
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293 // java_lang_Strings at resolved entries into symbolOops
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294 // or vice versa.
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295 char* string_at_noresolve(int which);
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296
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297 jint name_and_type_at(int which) {
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298 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
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299 return *int_at_addr(which);
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300 }
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301
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302 // The following methods (klass_ref_at, klass_ref_at_noresolve, name_ref_at,
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303 // signature_ref_at, klass_ref_index_at, name_and_type_ref_index_at,
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304 // name_ref_index_at, signature_ref_index_at) all expect constant pool indices
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305 // from the bytecodes to be passed in, which are actually potentially byte-swapped
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306 // contstant pool cache indices. See field_or_method_at.
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307
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308 // Lookup for entries consisting of (klass_index, name_and_type index)
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309 klassOop klass_ref_at(int which, TRAPS);
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310 symbolOop klass_ref_at_noresolve(int which);
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311 symbolOop name_ref_at(int which);
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312 symbolOop signature_ref_at(int which); // the type descriptor
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313
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314 int klass_ref_index_at(int which);
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315 int name_and_type_ref_index_at(int which);
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316
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317 // Lookup for entries consisting of (name_index, signature_index)
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318 int name_ref_index_at(int which);
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319 int signature_ref_index_at(int which);
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320
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321 BasicType basic_type_for_signature_at(int which);
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322
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323 // Resolve string constants (to prevent allocation during compilation)
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324 void resolve_string_constants(TRAPS) {
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325 constantPoolHandle h_this(THREAD, this);
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326 resolve_string_constants_impl(h_this, CHECK);
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327 }
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328
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329 // Klass name matches name at offset
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330 bool klass_name_at_matches(instanceKlassHandle k, int which);
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331
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332 // Sizing
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333 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; }
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334 static int object_size(int length) { return align_object_size(header_size() + length); }
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335 int object_size() { return object_size(length()); }
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336
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337 friend class constantPoolKlass;
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338 friend class ClassFileParser;
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339 friend class SystemDictionary;
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340
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341 // Used by compiler to prevent classloading.
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342 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which);
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343 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which);
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344 // Same as above - but does LinkResolving.
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345 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS);
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346
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347 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
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348 // future by other Java code. These take constant pool indices rather than possibly-byte-swapped
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349 // constant pool cache indices as do the peer methods above.
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350 symbolOop uncached_name_ref_at(int which);
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351 symbolOop uncached_signature_ref_at(int which);
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352 int uncached_klass_ref_index_at(int which);
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353 int uncached_name_and_type_ref_index_at(int which);
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354
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355 // Sharing
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356 int pre_resolve_shared_klasses(TRAPS);
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357 void shared_symbols_iterate(OopClosure* closure0);
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358 void shared_tags_iterate(OopClosure* closure0);
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359 void shared_strings_iterate(OopClosure* closure0);
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360
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361 // Debugging
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362 const char* printable_name_at(int which) PRODUCT_RETURN0;
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363
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364 private:
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365
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366 // Takes either a constant pool cache index in possibly byte-swapped
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367 // byte order (which comes from the bytecodes after rewriting) or,
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368 // if "uncached" is true, a vanilla constant pool index
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369 jint field_or_method_at(int which, bool uncached) {
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370 int i = -1;
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371 if (uncached || cache() == NULL) {
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372 i = which;
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373 } else {
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374 // change byte-ordering and go via cache
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375 i = cache()->entry_at(Bytes::swap_u2(which))->constant_pool_index();
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376 }
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377 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
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378 return *int_at_addr(i);
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379 }
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380
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381 // Used while constructing constant pool (only by ClassFileParser)
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382 jint klass_index_at(int which) {
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383 assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
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384 return *int_at_addr(which);
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385 }
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386
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387 jint string_index_at(int which) {
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388 assert(tag_at(which).is_string_index(), "Corrupted constant pool");
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389 return *int_at_addr(which);
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390 }
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391
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392 // Performs the LinkResolver checks
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393 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
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394
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395 // Implementation of methods that needs an exposed 'this' pointer, in order to
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396 // handle GC while executing the method
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397 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
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398 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS);
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399
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400 // Resolve string constants (to prevent allocation during compilation)
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401 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
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402
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403 public:
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404 // Merging constantPoolOop support:
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405 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
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406 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i,
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407 TRAPS);
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408 void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
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409 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
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410 int orig_length() const { return _orig_length; }
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411 void set_orig_length(int orig_length) { _orig_length = orig_length; }
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412
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413
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414 // JVMTI accesss - GetConstantPool, RetransformClasses, ...
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415 friend class JvmtiConstantPoolReconstituter;
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416
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417 private:
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418 jint cpool_entry_size(jint idx);
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419 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
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420
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421 // Copy cpool bytes into byte array.
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422 // Returns:
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423 // int > 0, count of the raw cpool bytes that have been copied
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424 // 0, OutOfMemory error
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425 // -1, Internal error
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426 int copy_cpool_bytes(int cpool_size,
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427 SymbolHashMap* tbl,
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428 unsigned char *bytes);
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429 };
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430
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431 class SymbolHashMapEntry : public CHeapObj {
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432 private:
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433 unsigned int _hash; // 32-bit hash for item
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434 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket
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435 symbolOop _symbol; // 1-st part of the mapping: symbol => value
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436 u2 _value; // 2-nd part of the mapping: symbol => value
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437
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438 public:
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439 unsigned int hash() const { return _hash; }
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440 void set_hash(unsigned int hash) { _hash = hash; }
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441
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442 SymbolHashMapEntry* next() const { return _next; }
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443 void set_next(SymbolHashMapEntry* next) { _next = next; }
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444
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445 symbolOop symbol() const { return _symbol; }
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446 void set_symbol(symbolOop sym) { _symbol = sym; }
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447
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448 u2 value() const { return _value; }
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449 void set_value(u2 value) { _value = value; }
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450
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451 SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value)
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452 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
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453
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454 }; // End SymbolHashMapEntry class
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455
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456
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457 class SymbolHashMapBucket : public CHeapObj {
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458
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459 private:
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460 SymbolHashMapEntry* _entry;
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461
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462 public:
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463 SymbolHashMapEntry* entry() const { return _entry; }
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464 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
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465 void clear() { _entry = NULL; }
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466
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467 }; // End SymbolHashMapBucket class
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468
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469
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470 class SymbolHashMap: public CHeapObj {
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471
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472 private:
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473 // Default number of entries in the table
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474 enum SymbolHashMap_Constants {
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475 _Def_HashMap_Size = 256
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476 };
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477
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478 int _table_size;
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479 SymbolHashMapBucket* _buckets;
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480
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481 void initialize_table(int table_size) {
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482 _table_size = table_size;
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483 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size);
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484 for (int index = 0; index < table_size; index++) {
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485 _buckets[index].clear();
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486 }
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487 }
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488
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489 public:
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490
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491 int table_size() const { return _table_size; }
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492
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493 SymbolHashMap() { initialize_table(_Def_HashMap_Size); }
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494 SymbolHashMap(int table_size) { initialize_table(table_size); }
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495
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496 // hash P(31) from Kernighan & Ritchie
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497 static unsigned int compute_hash(const char* str, int len) {
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498 unsigned int hash = 0;
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499 while (len-- > 0) {
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500 hash = 31*hash + (unsigned) *str;
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501 str++;
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502 }
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503 return hash;
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504 }
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505
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506 SymbolHashMapEntry* bucket(int i) {
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507 return _buckets[i].entry();
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508 }
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509
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510 void add_entry(symbolOop sym, u2 value);
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511 SymbolHashMapEntry* find_entry(symbolOop sym);
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512
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513 u2 symbol_to_value(symbolOop sym) {
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514 SymbolHashMapEntry *entry = find_entry(sym);
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515 return (entry == NULL) ? 0 : entry->value();
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516 }
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517
|
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518 ~SymbolHashMap() {
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519 SymbolHashMapEntry* next;
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520 for (int i = 0; i < _table_size; i++) {
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521 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
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522 next = cur->next();
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523 delete(cur);
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524 }
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525 }
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526 delete _buckets;
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527 }
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528 }; // End SymbolHashMap class
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