Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constantPoolOop.hpp @ 1552:c18cbe5936b8
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Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | dd57230ba8fe |
| children | e9ff18c4ace7 |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
| 25 // A constantPool is an array containing class constants as described in the | |
| 26 // class file. | |
| 27 // | |
| 28 // Most of the constant pool entries are written during class parsing, which | |
| 29 // is safe. For klass and string types, the constant pool entry is | |
| 30 // modified when the entry is resolved. If a klass or string constant pool | |
| 31 // entry is read without a lock, only the resolved state guarantees that | |
| 32 // the entry in the constant pool is a klass or String object and | |
| 33 // not a symbolOop. | |
| 34 | |
| 35 class SymbolHashMap; | |
| 36 | |
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37 class constantPoolOopDesc : public oopDesc { |
| 0 | 38 friend class VMStructs; |
| 39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
| 40 private: | |
| 41 typeArrayOop _tags; // the tag array describing the constant pool's contents | |
| 42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information | |
| 43 klassOop _pool_holder; // the corresponding class | |
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44 int _flags; // a few header bits to describe contents for GC |
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45 int _length; // number of elements in the array |
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46 volatile bool _is_conc_safe; // if true, safe for concurrent |
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47 // GC processing |
| 0 | 48 // only set to non-zero if constant pool is merged by RedefineClasses |
| 49 int _orig_length; | |
| 50 | |
| 51 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } | |
| 52 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } | |
| 53 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); } | |
| 54 | |
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55 enum FlagBit { |
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56 FB_has_invokedynamic = 1, |
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57 FB_has_pseudo_string = 2 |
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58 }; |
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59 |
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60 int flags() const { return _flags; } |
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61 void set_flags(int f) { _flags = f; } |
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62 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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63 void set_flag_at(FlagBit fb); |
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64 // no clear_flag_at function; they only increase |
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65 |
| 0 | 66 private: |
| 67 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
| 68 oop* tags_addr() { return (oop*)&_tags; } | |
| 69 oop* cache_addr() { return (oop*)&_cache; } | |
| 70 | |
| 71 oop* obj_at_addr(int which) const { | |
| 72 assert(is_within_bounds(which), "index out of bounds"); | |
| 73 return (oop*) &base()[which]; | |
| 74 } | |
| 75 | |
| 76 jint* int_at_addr(int which) const { | |
| 77 assert(is_within_bounds(which), "index out of bounds"); | |
| 78 return (jint*) &base()[which]; | |
| 79 } | |
| 80 | |
| 81 jlong* long_at_addr(int which) const { | |
| 82 assert(is_within_bounds(which), "index out of bounds"); | |
| 83 return (jlong*) &base()[which]; | |
| 84 } | |
| 85 | |
| 86 jfloat* float_at_addr(int which) const { | |
| 87 assert(is_within_bounds(which), "index out of bounds"); | |
| 88 return (jfloat*) &base()[which]; | |
| 89 } | |
| 90 | |
| 91 jdouble* double_at_addr(int which) const { | |
| 92 assert(is_within_bounds(which), "index out of bounds"); | |
| 93 return (jdouble*) &base()[which]; | |
| 94 } | |
| 95 | |
| 96 public: | |
| 97 typeArrayOop tags() const { return _tags; } | |
| 98 | |
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99 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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100 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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101 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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102 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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103 |
| 0 | 104 // Klass holding pool |
| 105 klassOop pool_holder() const { return _pool_holder; } | |
| 106 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
| 107 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
| 108 | |
| 109 // Interpreter runtime support | |
| 110 constantPoolCacheOop cache() const { return _cache; } | |
| 111 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
| 112 | |
| 113 // Assembly code support | |
| 114 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
| 115 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
| 116 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } | |
| 117 | |
| 118 // Storing constants | |
| 119 | |
| 120 void klass_at_put(int which, klassOop k) { | |
| 121 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 122 // The interpreter assumes when the tag is stored, the klass is resolved | |
| 123 // and the klassOop is a klass rather than a symbolOop, so we need | |
| 124 // hardware store ordering here. | |
| 125 release_tag_at_put(which, JVM_CONSTANT_Class); | |
| 126 if (UseConcMarkSweepGC) { | |
| 127 // In case the earlier card-mark was consumed by a concurrent | |
| 128 // marking thread before the tag was updated, redirty the card. | |
| 129 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 // For temporary use while constructing constant pool | |
| 134 void klass_index_at_put(int which, int name_index) { | |
| 135 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
| 136 *int_at_addr(which) = name_index; | |
| 137 } | |
| 138 | |
| 139 // Temporary until actual use | |
| 140 void unresolved_klass_at_put(int which, symbolOop s) { | |
| 141 // Overwrite the old index with a GC friendly value so | |
| 142 // that if GC looks during the transition it won't try | |
| 143 // to treat a small integer as oop. | |
| 144 *obj_at_addr(which) = NULL; | |
| 145 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); | |
| 146 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 147 } | |
| 148 | |
| 149 // Temporary until actual use | |
| 150 void unresolved_string_at_put(int which, symbolOop s) { | |
| 151 *obj_at_addr(which) = NULL; | |
| 152 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); | |
| 153 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 154 } | |
| 155 | |
| 156 void int_at_put(int which, jint i) { | |
| 157 tag_at_put(which, JVM_CONSTANT_Integer); | |
| 158 *int_at_addr(which) = i; | |
| 159 } | |
| 160 | |
| 161 void long_at_put(int which, jlong l) { | |
| 162 tag_at_put(which, JVM_CONSTANT_Long); | |
| 163 // *long_at_addr(which) = l; | |
| 164 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
| 165 } | |
| 166 | |
| 167 void float_at_put(int which, jfloat f) { | |
| 168 tag_at_put(which, JVM_CONSTANT_Float); | |
| 169 *float_at_addr(which) = f; | |
| 170 } | |
| 171 | |
| 172 void double_at_put(int which, jdouble d) { | |
| 173 tag_at_put(which, JVM_CONSTANT_Double); | |
| 174 // *double_at_addr(which) = d; | |
| 175 // u8 temp = *(u8*) &d; | |
| 176 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
| 177 } | |
| 178 | |
| 179 void symbol_at_put(int which, symbolOop s) { | |
| 180 tag_at_put(which, JVM_CONSTANT_Utf8); | |
| 181 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 182 } | |
| 183 | |
| 184 void string_at_put(int which, oop str) { | |
| 185 oop_store((volatile oop*)obj_at_addr(which), str); | |
| 186 release_tag_at_put(which, JVM_CONSTANT_String); | |
| 187 if (UseConcMarkSweepGC) { | |
| 188 // In case the earlier card-mark was consumed by a concurrent | |
| 189 // marking thread before the tag was updated, redirty the card. | |
| 190 oop_store_without_check((volatile oop *)obj_at_addr(which), str); | |
| 191 } | |
| 192 } | |
| 193 | |
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194 void object_at_put(int which, oop str) { |
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195 oop_store((volatile oop*) obj_at_addr(which), str); |
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196 release_tag_at_put(which, JVM_CONSTANT_Object); |
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197 if (UseConcMarkSweepGC) { |
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198 // In case the earlier card-mark was consumed by a concurrent |
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199 // marking thread before the tag was updated, redirty the card. |
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200 oop_store_without_check((volatile oop*) obj_at_addr(which), str); |
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201 } |
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202 } |
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203 |
| 0 | 204 // For temporary use while constructing constant pool |
| 205 void string_index_at_put(int which, int string_index) { | |
| 206 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
| 207 *int_at_addr(which) = string_index; | |
| 208 } | |
| 209 | |
| 210 void field_at_put(int which, int class_index, int name_and_type_index) { | |
| 211 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
| 212 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 213 } | |
| 214 | |
| 215 void method_at_put(int which, int class_index, int name_and_type_index) { | |
| 216 tag_at_put(which, JVM_CONSTANT_Methodref); | |
| 217 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 218 } | |
| 219 | |
| 220 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
| 221 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
| 222 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
| 223 } | |
| 224 | |
| 225 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
| 226 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
| 227 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
| 228 } | |
| 229 | |
| 230 // Tag query | |
| 231 | |
| 232 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
| 233 | |
| 234 // Whether the entry is a pointer that must be GC'd. | |
| 235 bool is_pointer_entry(int which) { | |
| 236 constantTag tag = tag_at(which); | |
| 237 return tag.is_klass() || | |
| 238 tag.is_unresolved_klass() || | |
| 239 tag.is_symbol() || | |
| 240 tag.is_unresolved_string() || | |
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241 tag.is_string() || |
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242 tag.is_object(); |
| 0 | 243 } |
| 244 | |
| 245 // Fetching constants | |
| 246 | |
| 247 klassOop klass_at(int which, TRAPS) { | |
| 248 constantPoolHandle h_this(THREAD, this); | |
| 249 return klass_at_impl(h_this, which, CHECK_NULL); | |
| 250 } | |
| 251 | |
| 252 symbolOop klass_name_at(int which); // Returns the name, w/o resolving. | |
| 253 | |
| 254 klassOop resolved_klass_at(int which) { // Used by Compiler | |
| 255 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
| 256 // Must do an acquire here in case another thread resolved the klass | |
| 257 // behind our back, lest we later load stale values thru the oop. | |
| 258 return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 259 } | |
| 260 | |
| 261 // This method should only be used with a cpool lock or during parsing or gc | |
| 262 symbolOop unresolved_klass_at(int which) { // Temporary until actual use | |
| 263 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 264 // check that the klass is still unresolved. | |
| 265 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
| 266 return s; | |
| 267 } | |
| 268 | |
| 269 // RedefineClasses() API support: | |
| 270 symbolOop klass_at_noresolve(int which) { return klass_name_at(which); } | |
| 271 | |
| 272 jint int_at(int which) { | |
| 273 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
| 274 return *int_at_addr(which); | |
| 275 } | |
| 276 | |
| 277 jlong long_at(int which) { | |
| 278 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
| 279 // return *long_at_addr(which); | |
| 280 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 281 return *((jlong*)&tmp); | |
| 282 } | |
| 283 | |
| 284 jfloat float_at(int which) { | |
| 285 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
| 286 return *float_at_addr(which); | |
| 287 } | |
| 288 | |
| 289 jdouble double_at(int which) { | |
| 290 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
| 291 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 292 return *((jdouble*)&tmp); | |
| 293 } | |
| 294 | |
| 295 symbolOop symbol_at(int which) { | |
| 296 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); | |
| 297 return symbolOop(*obj_at_addr(which)); | |
| 298 } | |
| 299 | |
| 300 oop string_at(int which, TRAPS) { | |
| 301 constantPoolHandle h_this(THREAD, this); | |
| 302 return string_at_impl(h_this, which, CHECK_NULL); | |
| 303 } | |
| 304 | |
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305 oop object_at(int which) { |
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306 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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307 return *obj_at_addr(which); |
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308 } |
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309 |
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310 // A "pseudo-string" is an non-string oop that has found is way into |
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311 // a String entry. |
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312 // Under AnonymousClasses this can happen if the user patches a live |
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313 // object into a CONSTANT_String entry of an anonymous class. |
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314 // Method oops internally created for method handles may also |
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315 // use pseudo-strings to link themselves to related metaobjects. |
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316 |
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317 bool is_pseudo_string_at(int which); |
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318 |
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319 oop pseudo_string_at(int which) { |
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320 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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321 return *obj_at_addr(which); |
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322 } |
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323 |
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324 void pseudo_string_at_put(int which, oop x) { |
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325 assert(AnonymousClasses, ""); |
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326 set_pseudo_string(); // mark header |
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327 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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328 string_at_put(which, x); // this works just fine |
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329 } |
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330 |
| 0 | 331 // only called when we are sure a string entry is already resolved (via an |
| 332 // earlier string_at call. | |
| 333 oop resolved_string_at(int which) { | |
| 334 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 335 // Must do an acquire here in case another thread resolved the klass | |
| 336 // behind our back, lest we later load stale values thru the oop. | |
| 337 return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)); | |
| 338 } | |
| 339 | |
| 340 // This method should only be used with a cpool lock or during parsing or gc | |
| 341 symbolOop unresolved_string_at(int which) { // Temporary until actual use | |
| 342 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 343 // check that the string is still unresolved. | |
| 344 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
| 345 return s; | |
| 346 } | |
| 347 | |
| 348 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
| 349 // UTF8 char* representation was chosen to avoid conversion of | |
| 350 // java_lang_Strings at resolved entries into symbolOops | |
| 351 // or vice versa. | |
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352 // Caller is responsible for checking for pseudo-strings. |
| 0 | 353 char* string_at_noresolve(int which); |
| 354 | |
| 355 jint name_and_type_at(int which) { | |
| 356 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
| 357 return *int_at_addr(which); | |
| 358 } | |
| 359 | |
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360 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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361 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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362 // directly from the bytecode, and extracted according to java byte order. |
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363 // If the indices are meant to refer to fields or methods, they are |
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364 // actually potentially byte-swapped, rewritten constant pool cache indices. |
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365 // The routine remap_instruction_operand_from_cache manages the adjustment |
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366 // of these values back to constant pool indices. |
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367 |
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368 // There are also "uncached" versions which do not adjust the operand index; see below. |
| 0 | 369 |
| 370 // Lookup for entries consisting of (klass_index, name_and_type index) | |
| 371 klassOop klass_ref_at(int which, TRAPS); | |
| 372 symbolOop klass_ref_at_noresolve(int which); | |
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373 symbolOop name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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374 symbolOop signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
| 0 | 375 |
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376 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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377 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
| 0 | 378 |
| 379 // Lookup for entries consisting of (name_index, signature_index) | |
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380 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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381 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
| 0 | 382 |
| 383 BasicType basic_type_for_signature_at(int which); | |
| 384 | |
| 385 // Resolve string constants (to prevent allocation during compilation) | |
| 386 void resolve_string_constants(TRAPS) { | |
| 387 constantPoolHandle h_this(THREAD, this); | |
| 388 resolve_string_constants_impl(h_this, CHECK); | |
| 389 } | |
| 390 | |
| 391 // Klass name matches name at offset | |
| 392 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
| 393 | |
| 394 // Sizing | |
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395 int length() const { return _length; } |
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396 void set_length(int length) { _length = length; } |
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397 |
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398 // Tells whether index is within bounds. |
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399 bool is_within_bounds(int index) const { |
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400 return 0 <= index && index < length(); |
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401 } |
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402 |
| 0 | 403 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
| 404 static int object_size(int length) { return align_object_size(header_size() + length); } | |
| 405 int object_size() { return object_size(length()); } | |
| 406 | |
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407 bool is_conc_safe() { return _is_conc_safe; } |
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408 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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409 |
| 0 | 410 friend class constantPoolKlass; |
| 411 friend class ClassFileParser; | |
| 412 friend class SystemDictionary; | |
| 413 | |
| 414 // Used by compiler to prevent classloading. | |
| 415 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 416 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 417 // Same as above - but does LinkResolving. | |
| 418 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
| 419 | |
| 420 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
| 421 // future by other Java code. These take constant pool indices rather than possibly-byte-swapped | |
| 422 // constant pool cache indices as do the peer methods above. | |
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423 symbolOop uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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424 symbolOop uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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425 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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426 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
| 0 | 427 |
| 428 // Sharing | |
| 429 int pre_resolve_shared_klasses(TRAPS); | |
| 430 void shared_symbols_iterate(OopClosure* closure0); | |
| 431 void shared_tags_iterate(OopClosure* closure0); | |
| 432 void shared_strings_iterate(OopClosure* closure0); | |
| 433 | |
| 434 // Debugging | |
| 435 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
| 436 | |
| 437 private: | |
| 438 | |
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439 symbolOop impl_name_ref_at(int which, bool uncached); |
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440 symbolOop impl_signature_ref_at(int which, bool uncached); |
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441 int impl_klass_ref_index_at(int which, bool uncached); |
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442 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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443 |
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444 int remap_instruction_operand_from_cache(int operand); |
| 0 | 445 |
| 446 // Used while constructing constant pool (only by ClassFileParser) | |
| 447 jint klass_index_at(int which) { | |
| 448 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
| 449 return *int_at_addr(which); | |
| 450 } | |
| 451 | |
| 452 jint string_index_at(int which) { | |
| 453 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
| 454 return *int_at_addr(which); | |
| 455 } | |
| 456 | |
| 457 // Performs the LinkResolver checks | |
| 458 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
| 459 | |
| 460 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
| 461 // handle GC while executing the method | |
| 462 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 463 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 464 | |
| 465 // Resolve string constants (to prevent allocation during compilation) | |
| 466 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
| 467 | |
| 468 public: | |
| 469 // Merging constantPoolOop support: | |
| 470 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
| 471 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, | |
| 472 TRAPS); | |
| 473 void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS); | |
| 474 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); | |
| 475 int orig_length() const { return _orig_length; } | |
| 476 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
| 477 | |
| 478 | |
| 479 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
| 480 friend class JvmtiConstantPoolReconstituter; | |
| 481 | |
| 482 private: | |
| 483 jint cpool_entry_size(jint idx); | |
| 484 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
| 485 | |
| 486 // Copy cpool bytes into byte array. | |
| 487 // Returns: | |
| 488 // int > 0, count of the raw cpool bytes that have been copied | |
| 489 // 0, OutOfMemory error | |
| 490 // -1, Internal error | |
| 491 int copy_cpool_bytes(int cpool_size, | |
| 492 SymbolHashMap* tbl, | |
| 493 unsigned char *bytes); | |
| 494 }; | |
| 495 | |
| 496 class SymbolHashMapEntry : public CHeapObj { | |
| 497 private: | |
| 498 unsigned int _hash; // 32-bit hash for item | |
| 499 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
| 500 symbolOop _symbol; // 1-st part of the mapping: symbol => value | |
| 501 u2 _value; // 2-nd part of the mapping: symbol => value | |
| 502 | |
| 503 public: | |
| 504 unsigned int hash() const { return _hash; } | |
| 505 void set_hash(unsigned int hash) { _hash = hash; } | |
| 506 | |
| 507 SymbolHashMapEntry* next() const { return _next; } | |
| 508 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
| 509 | |
| 510 symbolOop symbol() const { return _symbol; } | |
| 511 void set_symbol(symbolOop sym) { _symbol = sym; } | |
| 512 | |
| 513 u2 value() const { return _value; } | |
| 514 void set_value(u2 value) { _value = value; } | |
| 515 | |
| 516 SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value) | |
| 517 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} | |
| 518 | |
| 519 }; // End SymbolHashMapEntry class | |
| 520 | |
| 521 | |
| 522 class SymbolHashMapBucket : public CHeapObj { | |
| 523 | |
| 524 private: | |
| 525 SymbolHashMapEntry* _entry; | |
| 526 | |
| 527 public: | |
| 528 SymbolHashMapEntry* entry() const { return _entry; } | |
| 529 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
| 530 void clear() { _entry = NULL; } | |
| 531 | |
| 532 }; // End SymbolHashMapBucket class | |
| 533 | |
| 534 | |
| 535 class SymbolHashMap: public CHeapObj { | |
| 536 | |
| 537 private: | |
| 538 // Default number of entries in the table | |
| 539 enum SymbolHashMap_Constants { | |
| 540 _Def_HashMap_Size = 256 | |
| 541 }; | |
| 542 | |
| 543 int _table_size; | |
| 544 SymbolHashMapBucket* _buckets; | |
| 545 | |
| 546 void initialize_table(int table_size) { | |
| 547 _table_size = table_size; | |
| 548 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
| 549 for (int index = 0; index < table_size; index++) { | |
| 550 _buckets[index].clear(); | |
| 551 } | |
| 552 } | |
| 553 | |
| 554 public: | |
| 555 | |
| 556 int table_size() const { return _table_size; } | |
| 557 | |
| 558 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
| 559 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
| 560 | |
| 561 // hash P(31) from Kernighan & Ritchie | |
| 562 static unsigned int compute_hash(const char* str, int len) { | |
| 563 unsigned int hash = 0; | |
| 564 while (len-- > 0) { | |
| 565 hash = 31*hash + (unsigned) *str; | |
| 566 str++; | |
| 567 } | |
| 568 return hash; | |
| 569 } | |
| 570 | |
| 571 SymbolHashMapEntry* bucket(int i) { | |
| 572 return _buckets[i].entry(); | |
| 573 } | |
| 574 | |
| 575 void add_entry(symbolOop sym, u2 value); | |
| 576 SymbolHashMapEntry* find_entry(symbolOop sym); | |
| 577 | |
| 578 u2 symbol_to_value(symbolOop sym) { | |
| 579 SymbolHashMapEntry *entry = find_entry(sym); | |
| 580 return (entry == NULL) ? 0 : entry->value(); | |
| 581 } | |
| 582 | |
| 583 ~SymbolHashMap() { | |
| 584 SymbolHashMapEntry* next; | |
| 585 for (int i = 0; i < _table_size; i++) { | |
| 586 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
| 587 next = cur->next(); | |
| 588 delete(cur); | |
| 589 } | |
| 590 } | |
| 591 delete _buckets; | |
| 592 } | |
| 593 }; // End SymbolHashMap class |