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annotate src/share/vm/oops/constantPoolOop.hpp @ 1972:f95d63e2154a
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Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 3b2dea75431e |
| children | dad31fc330cd |
| 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" | |
| 30 #include "oops/typeArrayOop.hpp" | |
| 31 #include "utilities/constantTag.hpp" | |
| 32 #ifdef TARGET_ARCH_x86 | |
| 33 # include "bytes_x86.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_ARCH_sparc | |
| 36 # include "bytes_sparc.hpp" | |
| 37 #endif | |
| 38 #ifdef TARGET_ARCH_zero | |
| 39 # include "bytes_zero.hpp" | |
| 40 #endif | |
| 41 | |
| 0 | 42 // A constantPool is an array containing class constants as described in the |
| 43 // class file. | |
| 44 // | |
| 45 // Most of the constant pool entries are written during class parsing, which | |
| 46 // is safe. For klass and string types, the constant pool entry is | |
| 47 // modified when the entry is resolved. If a klass or string constant pool | |
| 48 // entry is read without a lock, only the resolved state guarantees that | |
| 49 // the entry in the constant pool is a klass or String object and | |
| 50 // not a symbolOop. | |
| 51 | |
| 52 class SymbolHashMap; | |
| 53 | |
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54 class constantPoolOopDesc : public oopDesc { |
| 0 | 55 friend class VMStructs; |
| 56 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
| 57 private: | |
| 58 typeArrayOop _tags; // the tag array describing the constant pool's contents | |
| 59 constantPoolCacheOop _cache; // the cache holding interpreter runtime information | |
| 60 klassOop _pool_holder; // the corresponding class | |
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61 typeArrayOop _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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62 int _flags; // a few header bits to describe contents for GC |
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63 int _length; // number of elements in the array |
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64 volatile bool _is_conc_safe; // if true, safe for concurrent |
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65 // GC processing |
| 0 | 66 // only set to non-zero if constant pool is merged by RedefineClasses |
| 67 int _orig_length; | |
| 68 | |
| 69 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } | |
| 70 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } | |
| 71 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); } | |
| 72 | |
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73 void set_operands(typeArrayOop operands) { oop_store_without_check((oop*)&_operands, operands); } |
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74 |
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75 enum FlagBit { |
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76 FB_has_invokedynamic = 1, |
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77 FB_has_pseudo_string = 2 |
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78 }; |
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79 |
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80 int flags() const { return _flags; } |
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81 void set_flags(int f) { _flags = f; } |
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82 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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83 void set_flag_at(FlagBit fb); |
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84 // no clear_flag_at function; they only increase |
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85 |
| 0 | 86 private: |
| 87 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
| 88 oop* tags_addr() { return (oop*)&_tags; } | |
| 89 oop* cache_addr() { return (oop*)&_cache; } | |
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90 oop* operands_addr() { return (oop*)&_operands; } |
| 0 | 91 |
| 92 oop* obj_at_addr(int which) const { | |
| 93 assert(is_within_bounds(which), "index out of bounds"); | |
| 94 return (oop*) &base()[which]; | |
| 95 } | |
| 96 | |
| 97 jint* int_at_addr(int which) const { | |
| 98 assert(is_within_bounds(which), "index out of bounds"); | |
| 99 return (jint*) &base()[which]; | |
| 100 } | |
| 101 | |
| 102 jlong* long_at_addr(int which) const { | |
| 103 assert(is_within_bounds(which), "index out of bounds"); | |
| 104 return (jlong*) &base()[which]; | |
| 105 } | |
| 106 | |
| 107 jfloat* float_at_addr(int which) const { | |
| 108 assert(is_within_bounds(which), "index out of bounds"); | |
| 109 return (jfloat*) &base()[which]; | |
| 110 } | |
| 111 | |
| 112 jdouble* double_at_addr(int which) const { | |
| 113 assert(is_within_bounds(which), "index out of bounds"); | |
| 114 return (jdouble*) &base()[which]; | |
| 115 } | |
| 116 | |
| 117 public: | |
| 118 typeArrayOop tags() const { return _tags; } | |
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119 typeArrayOop operands() const { return _operands; } |
| 0 | 120 |
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121 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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122 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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123 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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124 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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125 |
| 0 | 126 // Klass holding pool |
| 127 klassOop pool_holder() const { return _pool_holder; } | |
| 128 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
| 129 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
| 130 | |
| 131 // Interpreter runtime support | |
| 132 constantPoolCacheOop cache() const { return _cache; } | |
| 133 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
| 134 | |
| 135 // Assembly code support | |
| 136 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
| 137 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
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138 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); } |
| 0 | 139 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } |
| 140 | |
| 141 // Storing constants | |
| 142 | |
| 143 void klass_at_put(int which, klassOop k) { | |
| 144 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 145 // The interpreter assumes when the tag is stored, the klass is resolved | |
| 146 // and the klassOop is a klass rather than a symbolOop, so we need | |
| 147 // hardware store ordering here. | |
| 148 release_tag_at_put(which, JVM_CONSTANT_Class); | |
| 149 if (UseConcMarkSweepGC) { | |
| 150 // In case the earlier card-mark was consumed by a concurrent | |
| 151 // marking thread before the tag was updated, redirty the card. | |
| 152 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 // For temporary use while constructing constant pool | |
| 157 void klass_index_at_put(int which, int name_index) { | |
| 158 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
| 159 *int_at_addr(which) = name_index; | |
| 160 } | |
| 161 | |
| 162 // Temporary until actual use | |
| 163 void unresolved_klass_at_put(int which, symbolOop s) { | |
| 164 // Overwrite the old index with a GC friendly value so | |
| 165 // that if GC looks during the transition it won't try | |
| 166 // to treat a small integer as oop. | |
| 167 *obj_at_addr(which) = NULL; | |
| 168 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); | |
| 169 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 170 } | |
| 171 | |
| 1602 | 172 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
| 173 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
| 174 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
| 175 } | |
| 176 | |
| 177 void method_type_index_at_put(int which, int ref_index) { | |
| 178 tag_at_put(which, JVM_CONSTANT_MethodType); | |
| 179 *int_at_addr(which) = ref_index; | |
| 180 } | |
| 181 | |
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182 void invoke_dynamic_at_put(int which, int operand_base, int operand_count) { |
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183 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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184 *int_at_addr(which) = operand_base; // this is the real information |
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185 } |
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186 #ifdef ASSERT |
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187 bool check_invoke_dynamic_at(int which, |
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188 int bootstrap_method_index, |
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189 int name_and_type_index, |
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190 int argument_count) { |
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191 assert(invoke_dynamic_bootstrap_method_ref_index_at(which) == bootstrap_method_index, |
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192 "already stored by caller"); |
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193 assert(invoke_dynamic_name_and_type_ref_index_at(which) == name_and_type_index, |
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194 "already stored by caller"); |
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195 assert(invoke_dynamic_argument_count_at(which) == argument_count, |
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196 "consistent argument count"); |
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197 if (argument_count != 0) { |
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198 invoke_dynamic_argument_index_at(which, 0); |
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199 invoke_dynamic_argument_index_at(which, argument_count - 1); |
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200 } |
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201 return true; |
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202 } |
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203 #endif //ASSERT |
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204 |
| 0 | 205 // Temporary until actual use |
| 206 void unresolved_string_at_put(int which, symbolOop s) { | |
| 207 *obj_at_addr(which) = NULL; | |
| 208 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); | |
| 209 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 210 } | |
| 211 | |
| 212 void int_at_put(int which, jint i) { | |
| 213 tag_at_put(which, JVM_CONSTANT_Integer); | |
| 214 *int_at_addr(which) = i; | |
| 215 } | |
| 216 | |
| 217 void long_at_put(int which, jlong l) { | |
| 218 tag_at_put(which, JVM_CONSTANT_Long); | |
| 219 // *long_at_addr(which) = l; | |
| 220 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
| 221 } | |
| 222 | |
| 223 void float_at_put(int which, jfloat f) { | |
| 224 tag_at_put(which, JVM_CONSTANT_Float); | |
| 225 *float_at_addr(which) = f; | |
| 226 } | |
| 227 | |
| 228 void double_at_put(int which, jdouble d) { | |
| 229 tag_at_put(which, JVM_CONSTANT_Double); | |
| 230 // *double_at_addr(which) = d; | |
| 231 // u8 temp = *(u8*) &d; | |
| 232 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
| 233 } | |
| 234 | |
| 235 void symbol_at_put(int which, symbolOop s) { | |
| 236 tag_at_put(which, JVM_CONSTANT_Utf8); | |
| 237 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 238 } | |
| 239 | |
| 240 void string_at_put(int which, oop str) { | |
| 241 oop_store((volatile oop*)obj_at_addr(which), str); | |
| 242 release_tag_at_put(which, JVM_CONSTANT_String); | |
| 243 if (UseConcMarkSweepGC) { | |
| 244 // In case the earlier card-mark was consumed by a concurrent | |
| 245 // marking thread before the tag was updated, redirty the card. | |
| 246 oop_store_without_check((volatile oop *)obj_at_addr(which), str); | |
| 247 } | |
| 248 } | |
| 249 | |
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250 void object_at_put(int which, oop str) { |
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251 oop_store((volatile oop*) obj_at_addr(which), str); |
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252 release_tag_at_put(which, JVM_CONSTANT_Object); |
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253 if (UseConcMarkSweepGC) { |
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254 // In case the earlier card-mark was consumed by a concurrent |
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255 // marking thread before the tag was updated, redirty the card. |
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256 oop_store_without_check((volatile oop*) obj_at_addr(which), str); |
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257 } |
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258 } |
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259 |
| 0 | 260 // For temporary use while constructing constant pool |
| 261 void string_index_at_put(int which, int string_index) { | |
| 262 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
| 263 *int_at_addr(which) = string_index; | |
| 264 } | |
| 265 | |
| 266 void field_at_put(int which, int class_index, int name_and_type_index) { | |
| 267 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
| 268 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 269 } | |
| 270 | |
| 271 void method_at_put(int which, int class_index, int name_and_type_index) { | |
| 272 tag_at_put(which, JVM_CONSTANT_Methodref); | |
| 273 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 274 } | |
| 275 | |
| 276 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
| 277 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
| 278 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
| 279 } | |
| 280 | |
| 281 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
| 282 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
| 283 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
| 284 } | |
| 285 | |
| 286 // Tag query | |
| 287 | |
| 288 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
| 289 | |
| 290 // Whether the entry is a pointer that must be GC'd. | |
| 291 bool is_pointer_entry(int which) { | |
| 292 constantTag tag = tag_at(which); | |
| 293 return tag.is_klass() || | |
| 294 tag.is_unresolved_klass() || | |
| 295 tag.is_symbol() || | |
| 296 tag.is_unresolved_string() || | |
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297 tag.is_string() || |
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298 tag.is_object(); |
| 0 | 299 } |
| 300 | |
| 301 // Fetching constants | |
| 302 | |
| 303 klassOop klass_at(int which, TRAPS) { | |
| 304 constantPoolHandle h_this(THREAD, this); | |
| 305 return klass_at_impl(h_this, which, CHECK_NULL); | |
| 306 } | |
| 307 | |
| 308 symbolOop klass_name_at(int which); // Returns the name, w/o resolving. | |
| 309 | |
| 310 klassOop resolved_klass_at(int which) { // Used by Compiler | |
| 311 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
| 312 // Must do an acquire here in case another thread resolved the klass | |
| 313 // behind our back, lest we later load stale values thru the oop. | |
| 314 return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 315 } | |
| 316 | |
| 317 // This method should only be used with a cpool lock or during parsing or gc | |
| 318 symbolOop unresolved_klass_at(int which) { // Temporary until actual use | |
| 319 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 320 // check that the klass is still unresolved. | |
| 321 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
| 322 return s; | |
| 323 } | |
| 324 | |
| 325 // RedefineClasses() API support: | |
| 326 symbolOop klass_at_noresolve(int which) { return klass_name_at(which); } | |
| 327 | |
| 328 jint int_at(int which) { | |
| 329 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
| 330 return *int_at_addr(which); | |
| 331 } | |
| 332 | |
| 333 jlong long_at(int which) { | |
| 334 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
| 335 // return *long_at_addr(which); | |
| 336 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 337 return *((jlong*)&tmp); | |
| 338 } | |
| 339 | |
| 340 jfloat float_at(int which) { | |
| 341 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
| 342 return *float_at_addr(which); | |
| 343 } | |
| 344 | |
| 345 jdouble double_at(int which) { | |
| 346 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
| 347 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 348 return *((jdouble*)&tmp); | |
| 349 } | |
| 350 | |
| 351 symbolOop symbol_at(int which) { | |
| 352 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); | |
| 353 return symbolOop(*obj_at_addr(which)); | |
| 354 } | |
| 355 | |
| 356 oop string_at(int which, TRAPS) { | |
| 357 constantPoolHandle h_this(THREAD, this); | |
| 358 return string_at_impl(h_this, which, CHECK_NULL); | |
| 359 } | |
| 360 | |
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361 oop object_at(int which) { |
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362 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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363 return *obj_at_addr(which); |
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364 } |
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365 |
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366 // A "pseudo-string" is an non-string oop that has found is way into |
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367 // a String entry. |
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368 // Under AnonymousClasses this can happen if the user patches a live |
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369 // object into a CONSTANT_String entry of an anonymous class. |
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370 // Method oops internally created for method handles may also |
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371 // use pseudo-strings to link themselves to related metaobjects. |
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372 |
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373 bool is_pseudo_string_at(int which); |
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374 |
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375 oop pseudo_string_at(int which) { |
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376 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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377 return *obj_at_addr(which); |
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378 } |
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379 |
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380 void pseudo_string_at_put(int which, oop x) { |
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381 assert(AnonymousClasses, ""); |
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382 set_pseudo_string(); // mark header |
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383 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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384 string_at_put(which, x); // this works just fine |
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385 } |
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386 |
| 0 | 387 // only called when we are sure a string entry is already resolved (via an |
| 388 // earlier string_at call. | |
| 389 oop resolved_string_at(int which) { | |
| 390 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 391 // Must do an acquire here in case another thread resolved the klass | |
| 392 // behind our back, lest we later load stale values thru the oop. | |
| 393 return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)); | |
| 394 } | |
| 395 | |
| 396 // This method should only be used with a cpool lock or during parsing or gc | |
| 397 symbolOop unresolved_string_at(int which) { // Temporary until actual use | |
| 398 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 399 // check that the string is still unresolved. | |
| 400 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
| 401 return s; | |
| 402 } | |
| 403 | |
| 404 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
| 405 // UTF8 char* representation was chosen to avoid conversion of | |
| 406 // java_lang_Strings at resolved entries into symbolOops | |
| 407 // or vice versa. | |
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408 // Caller is responsible for checking for pseudo-strings. |
| 0 | 409 char* string_at_noresolve(int which); |
| 410 | |
| 411 jint name_and_type_at(int which) { | |
| 412 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
| 413 return *int_at_addr(which); | |
| 414 } | |
| 415 | |
| 1602 | 416 int method_handle_ref_kind_at(int which) { |
| 417 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 418 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
| 419 } | |
| 420 int method_handle_index_at(int which) { | |
| 421 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 422 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
| 423 } | |
| 424 int method_type_index_at(int which) { | |
| 425 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
| 426 return *int_at_addr(which); | |
| 427 } | |
| 428 // Derived queries: | |
| 429 symbolOop method_handle_name_ref_at(int which) { | |
| 430 int member = method_handle_index_at(which); | |
| 431 return impl_name_ref_at(member, true); | |
| 432 } | |
| 433 symbolOop method_handle_signature_ref_at(int which) { | |
| 434 int member = method_handle_index_at(which); | |
| 435 return impl_signature_ref_at(member, true); | |
| 436 } | |
| 437 int method_handle_klass_index_at(int which) { | |
| 438 int member = method_handle_index_at(which); | |
| 439 return impl_klass_ref_index_at(member, true); | |
| 440 } | |
| 441 symbolOop method_type_signature_at(int which) { | |
| 442 int sym = method_type_index_at(which); | |
| 443 return symbol_at(sym); | |
| 444 } | |
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445 |
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446 private: |
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447 // some nodes (InvokeDynamic) have a variable number of operands, each a u2 value |
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448 enum { _multi_operand_count_offset = -1, |
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449 _multi_operand_base_offset = 0, |
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450 _multi_operand_buffer_fill_pointer_offset = 0 // shared at front of operands array |
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451 }; |
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452 int multi_operand_buffer_length() { |
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453 return operands() == NULL ? 0 : operands()->length(); |
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454 } |
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455 int multi_operand_buffer_fill_pointer() { |
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456 return operands() == NULL |
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457 ? _multi_operand_buffer_fill_pointer_offset + 1 |
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458 : operands()->int_at(_multi_operand_buffer_fill_pointer_offset); |
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459 } |
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460 void multi_operand_buffer_grow(int min_length, TRAPS); |
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461 void set_multi_operand_buffer_fill_pointer(int fillp) { |
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462 assert(operands() != NULL, ""); |
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463 operands()->int_at_put(_multi_operand_buffer_fill_pointer_offset, fillp); |
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464 } |
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465 int multi_operand_base_at(int which) { |
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466 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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467 int op_base = *int_at_addr(which); |
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468 assert(op_base > _multi_operand_buffer_fill_pointer_offset, "Corrupted operand base"); |
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469 return op_base; |
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470 } |
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471 int multi_operand_count_at(int which) { |
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472 int op_base = multi_operand_base_at(which); |
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473 assert((uint)(op_base + _multi_operand_count_offset) < (uint)operands()->length(), "oob"); |
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474 int count = operands()->int_at(op_base + _multi_operand_count_offset); |
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475 return count; |
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476 } |
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477 int multi_operand_ref_at(int which, int i) { |
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478 int op_base = multi_operand_base_at(which); |
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479 assert((uint)i < (uint)multi_operand_count_at(which), "oob"); |
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480 assert((uint)(op_base + _multi_operand_base_offset + i) < (uint)operands()->length(), "oob"); |
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481 return operands()->int_at(op_base + _multi_operand_base_offset + i); |
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482 } |
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483 void set_multi_operand_ref_at(int which, int i, int ref) { |
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484 DEBUG_ONLY(multi_operand_ref_at(which, i)); // trigger asserts |
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485 int op_base = multi_operand_base_at(which); |
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486 operands()->int_at_put(op_base + _multi_operand_base_offset + i, ref); |
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487 } |
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488 |
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489 public: |
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490 // layout of InvokeDynamic: |
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491 enum { |
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492 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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493 _indy_nt_offset = 1, // CONSTANT_NameAndType descr |
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494 _indy_argc_offset = 2, // u2 argc |
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495 _indy_argv_offset = 3 // u2 argv[argc] |
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496 }; |
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497 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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498 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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499 return multi_operand_ref_at(which, _indy_bsm_offset); |
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500 } |
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501 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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502 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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503 return multi_operand_ref_at(which, _indy_nt_offset); |
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504 } |
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505 int invoke_dynamic_argument_count_at(int which) { |
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506 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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507 int argc = multi_operand_ref_at(which, _indy_argc_offset); |
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508 DEBUG_ONLY(int op_count = multi_operand_count_at(which)); |
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509 assert(_indy_argv_offset + argc == op_count, "consistent inner and outer counts"); |
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510 return argc; |
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511 } |
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512 int invoke_dynamic_argument_index_at(int which, int j) { |
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513 assert((uint)j < (uint)invoke_dynamic_argument_count_at(which), "oob"); |
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514 return multi_operand_ref_at(which, _indy_argv_offset + j); |
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515 } |
| 1602 | 516 |
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517 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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518 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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519 // directly from the bytecode. |
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520 // If the indices are meant to refer to fields or methods, they are |
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521 // actually rewritten constant pool cache indices. |
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522 // The routine remap_instruction_operand_from_cache manages the adjustment |
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523 // of these values back to constant pool indices. |
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524 |
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525 // There are also "uncached" versions which do not adjust the operand index; see below. |
| 0 | 526 |
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527 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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528 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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529 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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530 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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531 |
| 0 | 532 // Lookup for entries consisting of (klass_index, name_and_type index) |
| 533 klassOop klass_ref_at(int which, TRAPS); | |
| 534 symbolOop klass_ref_at_noresolve(int which); | |
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535 symbolOop name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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536 symbolOop signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
| 0 | 537 |
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538 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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539 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
| 0 | 540 |
| 541 // Lookup for entries consisting of (name_index, signature_index) | |
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542 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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543 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
| 0 | 544 |
| 545 BasicType basic_type_for_signature_at(int which); | |
| 546 | |
| 547 // Resolve string constants (to prevent allocation during compilation) | |
| 548 void resolve_string_constants(TRAPS) { | |
| 549 constantPoolHandle h_this(THREAD, this); | |
| 550 resolve_string_constants_impl(h_this, CHECK); | |
| 551 } | |
| 552 | |
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553 private: |
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554 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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555 public: |
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556 |
| 1602 | 557 // Resolve late bound constants. |
| 558 oop resolve_constant_at(int index, TRAPS) { | |
| 559 constantPoolHandle h_this(THREAD, this); | |
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560 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
| 1602 | 561 } |
| 562 | |
| 563 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
| 564 constantPoolHandle h_this(THREAD, this); | |
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565 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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566 } |
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567 |
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568 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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569 constantPoolHandle h_this(THREAD, this); |
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570 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
| 1602 | 571 } |
| 572 | |
| 0 | 573 // Klass name matches name at offset |
| 574 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
| 575 | |
| 576 // Sizing | |
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577 int length() const { return _length; } |
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578 void set_length(int length) { _length = length; } |
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579 |
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580 // Tells whether index is within bounds. |
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581 bool is_within_bounds(int index) const { |
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582 return 0 <= index && index < length(); |
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583 } |
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584 |
| 0 | 585 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
| 586 static int object_size(int length) { return align_object_size(header_size() + length); } | |
| 587 int object_size() { return object_size(length()); } | |
| 588 | |
|
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589 bool is_conc_safe() { return _is_conc_safe; } |
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590 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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591 |
| 0 | 592 friend class constantPoolKlass; |
| 593 friend class ClassFileParser; | |
| 594 friend class SystemDictionary; | |
| 595 | |
| 596 // Used by compiler to prevent classloading. | |
| 597 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 598 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 599 // Same as above - but does LinkResolving. | |
| 600 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
| 601 | |
| 602 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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603 // future by other Java code. These take constant pool indices rather than |
| 0 | 604 // constant pool cache indices as do the peer methods above. |
| 1602 | 605 symbolOop uncached_klass_ref_at_noresolve(int which); |
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606 symbolOop uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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607 symbolOop uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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608 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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609 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
| 0 | 610 |
| 611 // Sharing | |
| 612 int pre_resolve_shared_klasses(TRAPS); | |
| 613 void shared_symbols_iterate(OopClosure* closure0); | |
| 614 void shared_tags_iterate(OopClosure* closure0); | |
| 615 void shared_strings_iterate(OopClosure* closure0); | |
| 616 | |
| 617 // Debugging | |
| 618 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
| 619 | |
| 1565 | 620 #ifdef ASSERT |
| 621 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
| 1602 | 622 #else |
| 623 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
| 1565 | 624 #endif //ASSERT |
| 625 | |
| 0 | 626 private: |
| 627 | |
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628 symbolOop impl_name_ref_at(int which, bool uncached); |
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629 symbolOop impl_signature_ref_at(int which, bool uncached); |
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630 int impl_klass_ref_index_at(int which, bool uncached); |
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631 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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632 |
| 1565 | 633 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
| 0 | 634 |
| 635 // Used while constructing constant pool (only by ClassFileParser) | |
| 636 jint klass_index_at(int which) { | |
| 637 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
| 638 return *int_at_addr(which); | |
| 639 } | |
| 640 | |
| 641 jint string_index_at(int which) { | |
| 642 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
| 643 return *int_at_addr(which); | |
| 644 } | |
| 645 | |
| 646 // Performs the LinkResolver checks | |
| 647 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
| 648 | |
| 649 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
| 650 // handle GC while executing the method | |
| 651 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 652 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 653 | |
| 654 // Resolve string constants (to prevent allocation during compilation) | |
| 655 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
| 656 | |
| 1602 | 657 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
| 658 | |
| 0 | 659 public: |
| 660 // Merging constantPoolOop support: | |
| 661 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
| 662 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, | |
| 663 TRAPS); | |
| 664 void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS); | |
| 665 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); | |
| 666 int orig_length() const { return _orig_length; } | |
| 667 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
| 668 | |
| 669 | |
| 670 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
| 671 friend class JvmtiConstantPoolReconstituter; | |
| 672 | |
| 673 private: | |
| 674 jint cpool_entry_size(jint idx); | |
| 675 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
| 676 | |
| 677 // Copy cpool bytes into byte array. | |
| 678 // Returns: | |
| 679 // int > 0, count of the raw cpool bytes that have been copied | |
| 680 // 0, OutOfMemory error | |
| 681 // -1, Internal error | |
| 682 int copy_cpool_bytes(int cpool_size, | |
| 683 SymbolHashMap* tbl, | |
| 684 unsigned char *bytes); | |
| 685 }; | |
| 686 | |
| 687 class SymbolHashMapEntry : public CHeapObj { | |
| 688 private: | |
| 689 unsigned int _hash; // 32-bit hash for item | |
| 690 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
| 691 symbolOop _symbol; // 1-st part of the mapping: symbol => value | |
| 692 u2 _value; // 2-nd part of the mapping: symbol => value | |
| 693 | |
| 694 public: | |
| 695 unsigned int hash() const { return _hash; } | |
| 696 void set_hash(unsigned int hash) { _hash = hash; } | |
| 697 | |
| 698 SymbolHashMapEntry* next() const { return _next; } | |
| 699 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
| 700 | |
| 701 symbolOop symbol() const { return _symbol; } | |
| 702 void set_symbol(symbolOop sym) { _symbol = sym; } | |
| 703 | |
| 704 u2 value() const { return _value; } | |
| 705 void set_value(u2 value) { _value = value; } | |
| 706 | |
| 707 SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value) | |
| 708 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} | |
| 709 | |
| 710 }; // End SymbolHashMapEntry class | |
| 711 | |
| 712 | |
| 713 class SymbolHashMapBucket : public CHeapObj { | |
| 714 | |
| 715 private: | |
| 716 SymbolHashMapEntry* _entry; | |
| 717 | |
| 718 public: | |
| 719 SymbolHashMapEntry* entry() const { return _entry; } | |
| 720 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
| 721 void clear() { _entry = NULL; } | |
| 722 | |
| 723 }; // End SymbolHashMapBucket class | |
| 724 | |
| 725 | |
| 726 class SymbolHashMap: public CHeapObj { | |
| 727 | |
| 728 private: | |
| 729 // Default number of entries in the table | |
| 730 enum SymbolHashMap_Constants { | |
| 731 _Def_HashMap_Size = 256 | |
| 732 }; | |
| 733 | |
| 734 int _table_size; | |
| 735 SymbolHashMapBucket* _buckets; | |
| 736 | |
| 737 void initialize_table(int table_size) { | |
| 738 _table_size = table_size; | |
| 739 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
| 740 for (int index = 0; index < table_size; index++) { | |
| 741 _buckets[index].clear(); | |
| 742 } | |
| 743 } | |
| 744 | |
| 745 public: | |
| 746 | |
| 747 int table_size() const { return _table_size; } | |
| 748 | |
| 749 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
| 750 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
| 751 | |
| 752 // hash P(31) from Kernighan & Ritchie | |
| 753 static unsigned int compute_hash(const char* str, int len) { | |
| 754 unsigned int hash = 0; | |
| 755 while (len-- > 0) { | |
| 756 hash = 31*hash + (unsigned) *str; | |
| 757 str++; | |
| 758 } | |
| 759 return hash; | |
| 760 } | |
| 761 | |
| 762 SymbolHashMapEntry* bucket(int i) { | |
| 763 return _buckets[i].entry(); | |
| 764 } | |
| 765 | |
| 766 void add_entry(symbolOop sym, u2 value); | |
| 767 SymbolHashMapEntry* find_entry(symbolOop sym); | |
| 768 | |
| 769 u2 symbol_to_value(symbolOop sym) { | |
| 770 SymbolHashMapEntry *entry = find_entry(sym); | |
| 771 return (entry == NULL) ? 0 : entry->value(); | |
| 772 } | |
| 773 | |
| 774 ~SymbolHashMap() { | |
| 775 SymbolHashMapEntry* next; | |
| 776 for (int i = 0; i < _table_size; i++) { | |
| 777 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
| 778 next = cur->next(); | |
| 779 delete(cur); | |
| 780 } | |
| 781 } | |
| 782 delete _buckets; | |
| 783 } | |
| 784 }; // End SymbolHashMap class | |
| 1972 | 785 |
| 786 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |