Mercurial > hg > truffle
annotate src/share/vm/oops/constantPoolOop.hpp @ 2379:b099aaf51bf8
6962931: move interned strings out of the perm gen
Reviewed-by: never, coleenp, ysr, jwilhelm
| author | jcoomes |
|---|---|
| date | Tue, 22 Mar 2011 13:36:33 -0700 |
| parents | b92c45f2bc75 |
| children | 38fea01eb669 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1579 | 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_OOPS_CONSTANTPOOLOOP_HPP |
| 26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP | |
| 27 | |
| 28 #include "oops/arrayOop.hpp" | |
| 29 #include "oops/cpCacheOop.hpp" | |
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30 #include "oops/symbol.hpp" |
| 1972 | 31 #include "oops/typeArrayOop.hpp" |
| 32 #include "utilities/constantTag.hpp" | |
| 33 #ifdef TARGET_ARCH_x86 | |
| 34 # include "bytes_x86.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_ARCH_sparc | |
| 37 # include "bytes_sparc.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_ARCH_zero | |
| 40 # include "bytes_zero.hpp" | |
| 41 #endif | |
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42 #ifdef TARGET_ARCH_arm |
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43 # include "bytes_arm.hpp" |
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44 #endif |
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45 #ifdef TARGET_ARCH_ppc |
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46 # include "bytes_ppc.hpp" |
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47 #endif |
| 1972 | 48 |
| 0 | 49 // A constantPool is an array containing class constants as described in the |
| 50 // class file. | |
| 51 // | |
| 52 // Most of the constant pool entries are written during class parsing, which | |
| 53 // is safe. For klass and string types, the constant pool entry is | |
| 54 // modified when the entry is resolved. If a klass or string constant pool | |
| 55 // entry is read without a lock, only the resolved state guarantees that | |
| 56 // the entry in the constant pool is a klass or String object and | |
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57 // not a Symbol*. |
| 0 | 58 |
| 59 class SymbolHashMap; | |
| 60 | |
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61 class CPSlot VALUE_OBJ_CLASS_SPEC { |
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62 intptr_t _ptr; |
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63 public: |
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64 CPSlot(intptr_t ptr): _ptr(ptr) {} |
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65 CPSlot(void* ptr): _ptr((intptr_t)ptr) {} |
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66 CPSlot(oop ptr): _ptr((intptr_t)ptr) {} |
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67 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {} |
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68 |
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69 intptr_t value() { return _ptr; } |
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70 bool is_oop() { return (_ptr & 1) == 0; } |
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71 bool is_metadata() { return (_ptr & 1) == 1; } |
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72 |
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73 oop get_oop() { |
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74 assert(is_oop(), "bad call"); |
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75 return oop(_ptr); |
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76 } |
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77 Symbol* get_symbol() { |
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78 assert(is_metadata(), "bad call"); |
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79 return (Symbol*)(_ptr & ~1); |
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80 } |
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81 }; |
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82 |
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83 class constantPoolOopDesc : public oopDesc { |
| 0 | 84 friend class VMStructs; |
| 85 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
| 86 private: | |
| 87 typeArrayOop _tags; // the tag array describing the constant pool's contents | |
| 88 constantPoolCacheOop _cache; // the cache holding interpreter runtime information | |
| 89 klassOop _pool_holder; // the corresponding class | |
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90 typeArrayOop _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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91 int _flags; // a few header bits to describe contents for GC |
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92 int _length; // number of elements in the array |
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93 volatile bool _is_conc_safe; // if true, safe for concurrent |
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94 // GC processing |
| 0 | 95 // only set to non-zero if constant pool is merged by RedefineClasses |
| 96 int _orig_length; | |
| 97 | |
| 98 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } | |
| 99 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } | |
| 100 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); } | |
| 101 | |
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102 void set_operands(typeArrayOop operands) { oop_store_without_check((oop*)&_operands, operands); } |
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103 |
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104 enum FlagBit { |
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105 FB_has_invokedynamic = 1, |
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106 FB_has_pseudo_string = 2 |
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107 }; |
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108 |
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109 int flags() const { return _flags; } |
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110 void set_flags(int f) { _flags = f; } |
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111 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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112 void set_flag_at(FlagBit fb); |
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113 // no clear_flag_at function; they only increase |
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114 |
| 0 | 115 private: |
| 116 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
| 117 oop* tags_addr() { return (oop*)&_tags; } | |
| 118 oop* cache_addr() { return (oop*)&_cache; } | |
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119 oop* operands_addr() { return (oop*)&_operands; } |
| 0 | 120 |
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121 CPSlot slot_at(int which) { |
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122 assert(is_within_bounds(which), "index out of bounds"); |
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123 // There's a transitional value of zero when converting from |
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124 // Symbol->0->Klass for G1 when resolving classes and strings. |
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125 // wait for the value to be non-zero (this is temporary) |
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126 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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127 if (adr == 0 && which != 0) { |
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128 constantTag t = tag_at(which); |
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129 if (t.is_unresolved_klass() || t.is_klass() || |
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130 t.is_unresolved_string() || t.is_string()) { |
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131 while ((adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))) == 0); |
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132 } |
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133 } |
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134 return CPSlot(adr); |
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135 } |
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136 |
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137 void slot_at_put(int which, CPSlot s) const { |
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138 assert(is_within_bounds(which), "index out of bounds"); |
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139 *(intptr_t*)&base()[which] = s.value(); |
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140 } |
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141 oop* obj_at_addr_raw(int which) const { |
| 0 | 142 assert(is_within_bounds(which), "index out of bounds"); |
| 143 return (oop*) &base()[which]; | |
| 144 } | |
| 145 | |
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146 void obj_at_put_without_check(int which, oop o) { |
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147 assert(is_within_bounds(which), "index out of bounds"); |
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148 oop_store_without_check((volatile oop *)obj_at_addr_raw(which), o); |
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149 } |
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150 |
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151 void obj_at_put(int which, oop o) const { |
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152 assert(is_within_bounds(which), "index out of bounds"); |
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153 oop_store((volatile oop*)obj_at_addr_raw(which), o); |
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154 } |
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155 |
| 0 | 156 jint* int_at_addr(int which) const { |
| 157 assert(is_within_bounds(which), "index out of bounds"); | |
| 158 return (jint*) &base()[which]; | |
| 159 } | |
| 160 | |
| 161 jlong* long_at_addr(int which) const { | |
| 162 assert(is_within_bounds(which), "index out of bounds"); | |
| 163 return (jlong*) &base()[which]; | |
| 164 } | |
| 165 | |
| 166 jfloat* float_at_addr(int which) const { | |
| 167 assert(is_within_bounds(which), "index out of bounds"); | |
| 168 return (jfloat*) &base()[which]; | |
| 169 } | |
| 170 | |
| 171 jdouble* double_at_addr(int which) const { | |
| 172 assert(is_within_bounds(which), "index out of bounds"); | |
| 173 return (jdouble*) &base()[which]; | |
| 174 } | |
| 175 | |
| 176 public: | |
| 177 typeArrayOop tags() const { return _tags; } | |
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178 typeArrayOop operands() const { return _operands; } |
| 0 | 179 |
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180 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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181 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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182 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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183 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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184 |
| 0 | 185 // Klass holding pool |
| 186 klassOop pool_holder() const { return _pool_holder; } | |
| 187 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
| 188 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
| 189 | |
| 190 // Interpreter runtime support | |
| 191 constantPoolCacheOop cache() const { return _cache; } | |
| 192 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
| 193 | |
| 194 // Assembly code support | |
| 195 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
| 196 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
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197 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); } |
| 0 | 198 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } |
| 199 | |
| 200 // Storing constants | |
| 201 | |
| 202 void klass_at_put(int which, klassOop k) { | |
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203 // Overwrite the old index with a GC friendly value so |
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204 // that if G1 looks during the transition during oop_store it won't |
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205 // assert the symbol is not an oop. |
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206 *obj_at_addr_raw(which) = NULL; |
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207 assert(k != NULL, "resolved class shouldn't be null"); |
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208 obj_at_put_without_check(which, k); |
| 0 | 209 // The interpreter assumes when the tag is stored, the klass is resolved |
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210 // and the klassOop is a klass rather than a Symbol*, so we need |
| 0 | 211 // hardware store ordering here. |
| 212 release_tag_at_put(which, JVM_CONSTANT_Class); | |
| 213 if (UseConcMarkSweepGC) { | |
| 214 // In case the earlier card-mark was consumed by a concurrent | |
| 215 // marking thread before the tag was updated, redirty the card. | |
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216 obj_at_put_without_check(which, k); |
| 0 | 217 } |
| 218 } | |
| 219 | |
| 220 // For temporary use while constructing constant pool | |
| 221 void klass_index_at_put(int which, int name_index) { | |
| 222 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
| 223 *int_at_addr(which) = name_index; | |
| 224 } | |
| 225 | |
| 226 // Temporary until actual use | |
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227 void unresolved_klass_at_put(int which, Symbol* s) { |
| 0 | 228 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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229 slot_at_put(which, s); |
| 0 | 230 } |
| 231 | |
| 1602 | 232 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
| 233 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
| 234 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
| 235 } | |
| 236 | |
| 237 void method_type_index_at_put(int which, int ref_index) { | |
| 238 tag_at_put(which, JVM_CONSTANT_MethodType); | |
| 239 *int_at_addr(which) = ref_index; | |
| 240 } | |
| 241 | |
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242 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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243 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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244 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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245 } |
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246 |
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247 void invoke_dynamic_trans_at_put(int which, int bootstrap_method_index, int name_and_type_index) { |
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248 tag_at_put(which, JVM_CONSTANT_InvokeDynamicTrans); |
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249 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_method_index; |
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250 assert(AllowTransitionalJSR292, ""); |
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251 } |
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252 |
| 0 | 253 // Temporary until actual use |
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254 void unresolved_string_at_put(int which, Symbol* s) { |
| 0 | 255 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); |
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256 slot_at_put(which, s); |
| 0 | 257 } |
| 258 | |
| 259 void int_at_put(int which, jint i) { | |
| 260 tag_at_put(which, JVM_CONSTANT_Integer); | |
| 261 *int_at_addr(which) = i; | |
| 262 } | |
| 263 | |
| 264 void long_at_put(int which, jlong l) { | |
| 265 tag_at_put(which, JVM_CONSTANT_Long); | |
| 266 // *long_at_addr(which) = l; | |
| 267 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
| 268 } | |
| 269 | |
| 270 void float_at_put(int which, jfloat f) { | |
| 271 tag_at_put(which, JVM_CONSTANT_Float); | |
| 272 *float_at_addr(which) = f; | |
| 273 } | |
| 274 | |
| 275 void double_at_put(int which, jdouble d) { | |
| 276 tag_at_put(which, JVM_CONSTANT_Double); | |
| 277 // *double_at_addr(which) = d; | |
| 278 // u8 temp = *(u8*) &d; | |
| 279 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
| 280 } | |
| 281 | |
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282 Symbol** symbol_at_addr(int which) const { |
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283 assert(is_within_bounds(which), "index out of bounds"); |
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284 return (Symbol**) &base()[which]; |
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285 } |
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286 |
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287 void symbol_at_put(int which, Symbol* s) { |
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288 assert(s->refcount() != 0, "should have nonzero refcount"); |
| 0 | 289 tag_at_put(which, JVM_CONSTANT_Utf8); |
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290 slot_at_put(which, s); |
| 0 | 291 } |
| 292 | |
| 293 void string_at_put(int which, oop str) { | |
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294 // Overwrite the old index with a GC friendly value so |
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295 // that if G1 looks during the transition during oop_store it won't |
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296 // assert the symbol is not an oop. |
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297 *obj_at_addr_raw(which) = NULL; |
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298 assert(str != NULL, "resolved string shouldn't be null"); |
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299 obj_at_put(which, str); |
| 0 | 300 release_tag_at_put(which, JVM_CONSTANT_String); |
| 301 if (UseConcMarkSweepGC) { | |
| 302 // In case the earlier card-mark was consumed by a concurrent | |
| 303 // marking thread before the tag was updated, redirty the card. | |
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304 obj_at_put_without_check(which, str); |
| 0 | 305 } |
| 306 } | |
| 307 | |
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308 void object_at_put(int which, oop str) { |
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309 obj_at_put(which, str); |
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310 release_tag_at_put(which, JVM_CONSTANT_Object); |
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311 if (UseConcMarkSweepGC) { |
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312 // In case the earlier card-mark was consumed by a concurrent |
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313 // marking thread before the tag was updated, redirty the card. |
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314 obj_at_put_without_check(which, str); |
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315 } |
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316 } |
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317 |
| 0 | 318 // For temporary use while constructing constant pool |
| 319 void string_index_at_put(int which, int string_index) { | |
| 320 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
| 321 *int_at_addr(which) = string_index; | |
| 322 } | |
| 323 | |
| 324 void field_at_put(int which, int class_index, int name_and_type_index) { | |
| 325 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
| 326 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 327 } | |
| 328 | |
| 329 void method_at_put(int which, int class_index, int name_and_type_index) { | |
| 330 tag_at_put(which, JVM_CONSTANT_Methodref); | |
| 331 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 332 } | |
| 333 | |
| 334 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
| 335 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
| 336 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
| 337 } | |
| 338 | |
| 339 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
| 340 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
| 341 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
| 342 } | |
| 343 | |
| 344 // Tag query | |
| 345 | |
| 346 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
| 347 | |
| 348 // Whether the entry is a pointer that must be GC'd. | |
| 349 bool is_pointer_entry(int which) { | |
| 350 constantTag tag = tag_at(which); | |
| 351 return tag.is_klass() || | |
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352 tag.is_string() || |
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353 tag.is_object(); |
| 0 | 354 } |
| 355 | |
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356 // Whether the entry points to an object for ldc (resolved or not) |
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357 bool is_object_entry(int which) { |
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358 constantTag tag = tag_at(which); |
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359 return is_pointer_entry(which) || |
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360 tag.is_unresolved_klass() || |
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361 tag.is_unresolved_string() || |
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362 tag.is_symbol(); |
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363 } |
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364 |
| 0 | 365 // Fetching constants |
| 366 | |
| 367 klassOop klass_at(int which, TRAPS) { | |
| 368 constantPoolHandle h_this(THREAD, this); | |
| 369 return klass_at_impl(h_this, which, CHECK_NULL); | |
| 370 } | |
| 371 | |
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372 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
| 0 | 373 |
| 374 klassOop resolved_klass_at(int which) { // Used by Compiler | |
| 375 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
| 376 // Must do an acquire here in case another thread resolved the klass | |
| 377 // behind our back, lest we later load stale values thru the oop. | |
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378 return klassOop(CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop()); |
| 0 | 379 } |
| 380 | |
| 381 // This method should only be used with a cpool lock or during parsing or gc | |
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382 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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383 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
| 0 | 384 // check that the klass is still unresolved. |
| 385 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
| 386 return s; | |
| 387 } | |
| 388 | |
| 389 // RedefineClasses() API support: | |
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390 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
| 0 | 391 |
| 392 jint int_at(int which) { | |
| 393 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
| 394 return *int_at_addr(which); | |
| 395 } | |
| 396 | |
| 397 jlong long_at(int which) { | |
| 398 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
| 399 // return *long_at_addr(which); | |
| 400 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 401 return *((jlong*)&tmp); | |
| 402 } | |
| 403 | |
| 404 jfloat float_at(int which) { | |
| 405 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
| 406 return *float_at_addr(which); | |
| 407 } | |
| 408 | |
| 409 jdouble double_at(int which) { | |
| 410 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
| 411 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 412 return *((jdouble*)&tmp); | |
| 413 } | |
| 414 | |
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415 Symbol* symbol_at(int which) { |
| 0 | 416 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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417 return slot_at(which).get_symbol(); |
| 0 | 418 } |
| 419 | |
| 420 oop string_at(int which, TRAPS) { | |
| 421 constantPoolHandle h_this(THREAD, this); | |
| 422 return string_at_impl(h_this, which, CHECK_NULL); | |
| 423 } | |
| 424 | |
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425 oop object_at(int which) { |
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426 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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427 return slot_at(which).get_oop(); |
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428 } |
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429 |
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430 // A "pseudo-string" is an non-string oop that has found is way into |
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431 // a String entry. |
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432 // Under AnonymousClasses this can happen if the user patches a live |
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433 // object into a CONSTANT_String entry of an anonymous class. |
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434 // Method oops internally created for method handles may also |
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435 // use pseudo-strings to link themselves to related metaobjects. |
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436 |
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437 bool is_pseudo_string_at(int which); |
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438 |
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439 oop pseudo_string_at(int which) { |
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440 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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441 return slot_at(which).get_oop(); |
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442 } |
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443 |
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444 void pseudo_string_at_put(int which, oop x) { |
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445 assert(AnonymousClasses, ""); |
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446 set_pseudo_string(); // mark header |
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447 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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448 string_at_put(which, x); // this works just fine |
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449 } |
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450 |
| 0 | 451 // only called when we are sure a string entry is already resolved (via an |
| 452 // earlier string_at call. | |
| 453 oop resolved_string_at(int which) { | |
| 454 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 455 // Must do an acquire here in case another thread resolved the klass | |
| 456 // behind our back, lest we later load stale values thru the oop. | |
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457 return CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop(); |
| 0 | 458 } |
| 459 | |
| 460 // This method should only be used with a cpool lock or during parsing or gc | |
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461 Symbol* unresolved_string_at(int which) { // Temporary until actual use |
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462 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
| 0 | 463 // check that the string is still unresolved. |
| 464 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
| 465 return s; | |
| 466 } | |
| 467 | |
| 468 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
| 469 // UTF8 char* representation was chosen to avoid conversion of | |
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470 // java_lang_Strings at resolved entries into Symbol*s |
| 0 | 471 // or vice versa. |
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472 // Caller is responsible for checking for pseudo-strings. |
| 0 | 473 char* string_at_noresolve(int which); |
| 474 | |
| 475 jint name_and_type_at(int which) { | |
| 476 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
| 477 return *int_at_addr(which); | |
| 478 } | |
| 479 | |
| 1602 | 480 int method_handle_ref_kind_at(int which) { |
| 481 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 482 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
| 483 } | |
| 484 int method_handle_index_at(int which) { | |
| 485 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 486 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
| 487 } | |
| 488 int method_type_index_at(int which) { | |
| 489 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
| 490 return *int_at_addr(which); | |
| 491 } | |
| 492 // Derived queries: | |
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493 Symbol* method_handle_name_ref_at(int which) { |
| 1602 | 494 int member = method_handle_index_at(which); |
| 495 return impl_name_ref_at(member, true); | |
| 496 } | |
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497 Symbol* method_handle_signature_ref_at(int which) { |
| 1602 | 498 int member = method_handle_index_at(which); |
| 499 return impl_signature_ref_at(member, true); | |
| 500 } | |
| 501 int method_handle_klass_index_at(int which) { | |
| 502 int member = method_handle_index_at(which); | |
| 503 return impl_klass_ref_index_at(member, true); | |
| 504 } | |
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505 Symbol* method_type_signature_at(int which) { |
| 1602 | 506 int sym = method_type_index_at(which); |
| 507 return symbol_at(sym); | |
| 508 } | |
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509 |
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510 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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511 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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512 return extract_high_short_from_int(*int_at_addr(which)); |
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513 } |
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514 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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515 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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516 return extract_low_short_from_int(*int_at_addr(which)); |
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517 } |
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518 int invoke_dynamic_operand_base(int which) { |
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519 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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520 return operand_offset_at(operands(), bootstrap_specifier_index); |
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521 } |
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522 // The first part of the operands array consists of an index into the second part. |
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523 // Extract a 32-bit index value from the first part. |
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524 static int operand_offset_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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525 int n = (bootstrap_specifier_index * 2); |
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526 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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527 // The first 32-bit index points to the beginning of the second part |
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528 // of the operands array. Make sure this index is in the first part. |
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529 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->short_at(0), |
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530 operands->short_at(1))); |
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531 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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532 int offset = build_int_from_shorts(operands->short_at(n+0), |
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533 operands->short_at(n+1)); |
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534 // The offset itself must point into the second part of the array. |
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535 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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536 return offset; |
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537 } |
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538 static void operand_offset_at_put(typeArrayOop operands, int bootstrap_specifier_index, int offset) { |
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539 int n = bootstrap_specifier_index * 2; |
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540 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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541 operands->short_at_put(n+0, extract_low_short_from_int(offset)); |
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542 operands->short_at_put(n+1, extract_high_short_from_int(offset)); |
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543 } |
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544 static int operand_array_length(typeArrayOop operands) { |
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545 if (operands == NULL || operands->length() == 0) return 0; |
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546 int second_part = operand_offset_at(operands, 0); |
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547 return (second_part / 2); |
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548 } |
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549 |
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550 #ifdef ASSERT |
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551 // operand tuples fit together exactly, end to end |
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552 static int operand_limit_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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553 int nextidx = bootstrap_specifier_index + 1; |
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554 if (nextidx == operand_array_length(operands)) |
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555 return operands->length(); |
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556 else |
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557 return operand_offset_at(operands, nextidx); |
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558 } |
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559 int invoke_dynamic_operand_limit(int which) { |
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560 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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561 return operand_limit_at(operands(), bootstrap_specifier_index); |
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562 } |
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563 #endif //ASSERT |
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564 |
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565 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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566 enum { |
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567 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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568 _indy_argc_offset = 1, // u2 argc |
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569 _indy_argv_offset = 2 // u2 argv[argc] |
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570 }; |
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571 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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572 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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573 if (tag_at(which).value() == JVM_CONSTANT_InvokeDynamicTrans) |
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574 return extract_low_short_from_int(*int_at_addr(which)); |
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575 int op_base = invoke_dynamic_operand_base(which); |
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576 return operands()->short_at(op_base + _indy_bsm_offset); |
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577 } |
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578 int invoke_dynamic_argument_count_at(int which) { |
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579 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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580 if (tag_at(which).value() == JVM_CONSTANT_InvokeDynamicTrans) |
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581 return 0; |
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582 int op_base = invoke_dynamic_operand_base(which); |
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583 int argc = operands()->short_at(op_base + _indy_argc_offset); |
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584 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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585 int next_offset = invoke_dynamic_operand_limit(which)); |
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586 assert(end_offset == next_offset, "matched ending"); |
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587 return argc; |
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588 } |
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589 int invoke_dynamic_argument_index_at(int which, int j) { |
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590 int op_base = invoke_dynamic_operand_base(which); |
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591 DEBUG_ONLY(int argc = operands()->short_at(op_base + _indy_argc_offset)); |
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592 assert((uint)j < (uint)argc, "oob"); |
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593 return operands()->short_at(op_base + _indy_argv_offset + j); |
|
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594 } |
| 1602 | 595 |
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596 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
|
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597 // name_and_type_ref_index_at) all expect to be passed indices obtained |
|
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598 // directly from the bytecode. |
|
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599 // If the indices are meant to refer to fields or methods, they are |
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600 // actually rewritten constant pool cache indices. |
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601 // The routine remap_instruction_operand_from_cache manages the adjustment |
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602 // of these values back to constant pool indices. |
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603 |
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604 // There are also "uncached" versions which do not adjust the operand index; see below. |
| 0 | 605 |
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606 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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607 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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608 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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609 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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610 |
| 0 | 611 // Lookup for entries consisting of (klass_index, name_and_type index) |
| 612 klassOop klass_ref_at(int which, TRAPS); | |
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613 Symbol* klass_ref_at_noresolve(int which); |
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614 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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615 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
| 0 | 616 |
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617 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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618 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
| 0 | 619 |
| 620 // Lookup for entries consisting of (name_index, signature_index) | |
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621 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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622 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
| 0 | 623 |
| 624 BasicType basic_type_for_signature_at(int which); | |
| 625 | |
| 626 // Resolve string constants (to prevent allocation during compilation) | |
| 627 void resolve_string_constants(TRAPS) { | |
| 628 constantPoolHandle h_this(THREAD, this); | |
| 629 resolve_string_constants_impl(h_this, CHECK); | |
| 630 } | |
| 631 | |
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632 private: |
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633 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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634 public: |
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635 |
| 1602 | 636 // Resolve late bound constants. |
| 637 oop resolve_constant_at(int index, TRAPS) { | |
| 638 constantPoolHandle h_this(THREAD, this); | |
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639 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
| 1602 | 640 } |
| 641 | |
| 642 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
| 643 constantPoolHandle h_this(THREAD, this); | |
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644 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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645 } |
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646 |
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647 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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648 constantPoolHandle h_this(THREAD, this); |
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649 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
| 1602 | 650 } |
| 651 | |
| 0 | 652 // Klass name matches name at offset |
| 653 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
| 654 | |
| 655 // Sizing | |
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656 int length() const { return _length; } |
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657 void set_length(int length) { _length = length; } |
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658 |
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659 // Tells whether index is within bounds. |
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660 bool is_within_bounds(int index) const { |
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661 return 0 <= index && index < length(); |
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662 } |
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663 |
| 0 | 664 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
| 665 static int object_size(int length) { return align_object_size(header_size() + length); } | |
| 666 int object_size() { return object_size(length()); } | |
| 667 | |
|
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668 bool is_conc_safe() { return _is_conc_safe; } |
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669 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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670 |
| 0 | 671 friend class constantPoolKlass; |
| 672 friend class ClassFileParser; | |
| 673 friend class SystemDictionary; | |
| 674 | |
| 675 // Used by compiler to prevent classloading. | |
| 676 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 677 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 678 // Same as above - but does LinkResolving. | |
| 679 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
| 680 | |
| 681 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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682 // future by other Java code. These take constant pool indices rather than |
| 0 | 683 // constant pool cache indices as do the peer methods above. |
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684 Symbol* uncached_klass_ref_at_noresolve(int which); |
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685 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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686 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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687 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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688 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
| 0 | 689 |
| 690 // Sharing | |
| 691 int pre_resolve_shared_klasses(TRAPS); | |
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692 void shared_symbols_iterate(SymbolClosure* closure0); |
| 0 | 693 void shared_tags_iterate(OopClosure* closure0); |
| 694 void shared_strings_iterate(OopClosure* closure0); | |
| 695 | |
| 696 // Debugging | |
| 697 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
| 698 | |
| 1565 | 699 #ifdef ASSERT |
| 700 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
| 1602 | 701 #else |
| 702 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
| 1565 | 703 #endif //ASSERT |
| 704 | |
| 0 | 705 private: |
| 706 | |
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707 Symbol* impl_name_ref_at(int which, bool uncached); |
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708 Symbol* impl_signature_ref_at(int which, bool uncached); |
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709 int impl_klass_ref_index_at(int which, bool uncached); |
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710 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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711 |
| 1565 | 712 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
| 0 | 713 |
| 714 // Used while constructing constant pool (only by ClassFileParser) | |
| 715 jint klass_index_at(int which) { | |
| 716 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
| 717 return *int_at_addr(which); | |
| 718 } | |
| 719 | |
| 720 jint string_index_at(int which) { | |
| 721 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
| 722 return *int_at_addr(which); | |
| 723 } | |
| 724 | |
| 725 // Performs the LinkResolver checks | |
| 726 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
| 727 | |
| 728 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
| 729 // handle GC while executing the method | |
| 730 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 731 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 732 | |
| 733 // Resolve string constants (to prevent allocation during compilation) | |
| 734 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
| 735 | |
| 1602 | 736 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
| 737 | |
| 0 | 738 public: |
| 739 // Merging constantPoolOop support: | |
| 740 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
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741 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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742 constantPoolHandle h_this(THREAD, this); |
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743 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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744 } |
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745 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS); |
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746 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
| 0 | 747 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
| 748 int orig_length() const { return _orig_length; } | |
| 749 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
| 750 | |
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751 // Decrease ref counts of symbols that are in the constant pool |
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752 // when the holder class is unloaded |
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753 void unreference_symbols(); |
| 0 | 754 |
| 755 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
| 756 friend class JvmtiConstantPoolReconstituter; | |
| 757 | |
| 758 private: | |
| 759 jint cpool_entry_size(jint idx); | |
| 760 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
| 761 | |
| 762 // Copy cpool bytes into byte array. | |
| 763 // Returns: | |
| 764 // int > 0, count of the raw cpool bytes that have been copied | |
| 765 // 0, OutOfMemory error | |
| 766 // -1, Internal error | |
| 767 int copy_cpool_bytes(int cpool_size, | |
| 768 SymbolHashMap* tbl, | |
| 769 unsigned char *bytes); | |
| 770 }; | |
| 771 | |
| 772 class SymbolHashMapEntry : public CHeapObj { | |
| 773 private: | |
| 774 unsigned int _hash; // 32-bit hash for item | |
| 775 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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776 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
| 0 | 777 u2 _value; // 2-nd part of the mapping: symbol => value |
| 778 | |
| 779 public: | |
| 780 unsigned int hash() const { return _hash; } | |
| 781 void set_hash(unsigned int hash) { _hash = hash; } | |
| 782 | |
| 783 SymbolHashMapEntry* next() const { return _next; } | |
| 784 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
| 785 | |
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786 Symbol* symbol() const { return _symbol; } |
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787 void set_symbol(Symbol* sym) { _symbol = sym; } |
| 0 | 788 |
| 789 u2 value() const { return _value; } | |
| 790 void set_value(u2 value) { _value = value; } | |
| 791 | |
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792 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
| 0 | 793 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
| 794 | |
| 795 }; // End SymbolHashMapEntry class | |
| 796 | |
| 797 | |
| 798 class SymbolHashMapBucket : public CHeapObj { | |
| 799 | |
| 800 private: | |
| 801 SymbolHashMapEntry* _entry; | |
| 802 | |
| 803 public: | |
| 804 SymbolHashMapEntry* entry() const { return _entry; } | |
| 805 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
| 806 void clear() { _entry = NULL; } | |
| 807 | |
| 808 }; // End SymbolHashMapBucket class | |
| 809 | |
| 810 | |
| 811 class SymbolHashMap: public CHeapObj { | |
| 812 | |
| 813 private: | |
| 814 // Default number of entries in the table | |
| 815 enum SymbolHashMap_Constants { | |
| 816 _Def_HashMap_Size = 256 | |
| 817 }; | |
| 818 | |
| 819 int _table_size; | |
| 820 SymbolHashMapBucket* _buckets; | |
| 821 | |
| 822 void initialize_table(int table_size) { | |
| 823 _table_size = table_size; | |
| 824 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
| 825 for (int index = 0; index < table_size; index++) { | |
| 826 _buckets[index].clear(); | |
| 827 } | |
| 828 } | |
| 829 | |
| 830 public: | |
| 831 | |
| 832 int table_size() const { return _table_size; } | |
| 833 | |
| 834 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
| 835 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
| 836 | |
| 837 // hash P(31) from Kernighan & Ritchie | |
| 838 static unsigned int compute_hash(const char* str, int len) { | |
| 839 unsigned int hash = 0; | |
| 840 while (len-- > 0) { | |
| 841 hash = 31*hash + (unsigned) *str; | |
| 842 str++; | |
| 843 } | |
| 844 return hash; | |
| 845 } | |
| 846 | |
| 847 SymbolHashMapEntry* bucket(int i) { | |
| 848 return _buckets[i].entry(); | |
| 849 } | |
| 850 | |
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851 void add_entry(Symbol* sym, u2 value); |
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852 SymbolHashMapEntry* find_entry(Symbol* sym); |
| 0 | 853 |
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854 u2 symbol_to_value(Symbol* sym) { |
| 0 | 855 SymbolHashMapEntry *entry = find_entry(sym); |
| 856 return (entry == NULL) ? 0 : entry->value(); | |
| 857 } | |
| 858 | |
| 859 ~SymbolHashMap() { | |
| 860 SymbolHashMapEntry* next; | |
| 861 for (int i = 0; i < _table_size; i++) { | |
| 862 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
| 863 next = cur->next(); | |
| 864 delete(cur); | |
| 865 } | |
| 866 } | |
| 867 delete _buckets; | |
| 868 } | |
| 869 }; // End SymbolHashMap class | |
| 1972 | 870 |
| 871 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |