Mercurial > hg > truffle
annotate src/share/vm/oops/constantPoolOop.cpp @ 1660:083fde3b838e
6964498: JSR 292 invokedynamic sites need local bootstrap methods
Summary: Add JVM_CONSTANT_InvokeDynamic records to constant pool to determine per-instruction BSMs.
Reviewed-by: twisti
| author | jrose |
|---|---|
| date | Thu, 15 Jul 2010 18:40:45 -0700 |
| parents | 136b78722a08 |
| children | d257356e35f0 |
| 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 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_constantPoolOop.cpp.incl" | |
| 27 | |
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28 void constantPoolOopDesc::set_flag_at(FlagBit fb) { |
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29 const int MAX_STATE_CHANGES = 2; |
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30 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) { |
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31 int oflags = _flags; |
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32 int nflags = oflags | (1 << (int)fb); |
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33 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags) |
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34 return; |
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35 } |
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36 assert(false, "failed to cmpxchg flags"); |
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37 _flags |= (1 << (int)fb); // better than nothing |
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38 } |
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39 |
| 0 | 40 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
| 41 // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop. | |
| 42 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and | |
| 43 // tag is not updated atomicly. | |
| 44 oop entry = *(this_oop->obj_at_addr(which)); | |
| 45 if (entry->is_klass()) { | |
| 46 // Already resolved - return entry. | |
| 47 return (klassOop)entry; | |
| 48 } | |
| 49 | |
| 50 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
| 51 // already has updated the object | |
| 52 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
| 53 bool do_resolve = false; | |
| 54 bool in_error = false; | |
| 55 | |
| 56 symbolHandle name; | |
| 57 Handle loader; | |
| 58 { ObjectLocker ol(this_oop, THREAD); | |
| 59 | |
| 60 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
| 61 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
| 62 in_error = true; | |
| 63 } else { | |
| 64 do_resolve = true; | |
| 65 name = symbolHandle(THREAD, this_oop->unresolved_klass_at(which)); | |
| 66 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader()); | |
| 67 } | |
| 68 } | |
| 69 } // unlocking constantPool | |
| 70 | |
| 71 | |
| 72 // The original attempt to resolve this constant pool entry failed so find the | |
| 73 // original error and throw it again (JVMS 5.4.3). | |
| 74 if (in_error) { | |
| 75 symbolOop error = SystemDictionary::find_resolution_error(this_oop, which); | |
| 76 guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table"); | |
| 77 ResourceMark rm; | |
| 78 // exception text will be the class name | |
| 79 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
| 80 THROW_MSG_0(error, className); | |
| 81 } | |
| 82 | |
| 83 if (do_resolve) { | |
| 84 // this_oop must be unlocked during resolve_or_fail | |
| 85 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); | |
| 86 Handle h_prot (THREAD, protection_domain); | |
| 87 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); | |
| 88 KlassHandle k; | |
| 89 if (!HAS_PENDING_EXCEPTION) { | |
| 90 k = KlassHandle(THREAD, k_oop); | |
| 91 // Do access check for klasses | |
| 92 verify_constant_pool_resolve(this_oop, k, THREAD); | |
| 93 } | |
| 94 | |
| 95 // Failed to resolve class. We must record the errors so that subsequent attempts | |
| 96 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
| 97 if (HAS_PENDING_EXCEPTION) { | |
| 98 ResourceMark rm; | |
| 99 symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name()); | |
| 100 | |
| 101 bool throw_orig_error = false; | |
| 102 { | |
| 103 ObjectLocker ol (this_oop, THREAD); | |
| 104 | |
| 105 // some other thread has beaten us and has resolved the class. | |
| 106 if (this_oop->tag_at(which).is_klass()) { | |
| 107 CLEAR_PENDING_EXCEPTION; | |
| 108 entry = this_oop->resolved_klass_at(which); | |
| 109 return (klassOop)entry; | |
| 110 } | |
| 111 | |
| 112 if (!PENDING_EXCEPTION-> | |
| 1142 | 113 is_a(SystemDictionary::LinkageError_klass())) { |
| 0 | 114 // Just throw the exception and don't prevent these classes from |
| 115 // being loaded due to virtual machine errors like StackOverflow | |
| 116 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
| 117 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
| 118 } | |
| 119 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
| 120 SystemDictionary::add_resolution_error(this_oop, which, error); | |
| 121 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
| 122 } else { | |
| 123 // some other thread has put the class in error state. | |
| 124 error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which)); | |
| 125 assert(!error.is_null(), "checking"); | |
| 126 throw_orig_error = true; | |
| 127 } | |
| 128 } // unlocked | |
| 129 | |
| 130 if (throw_orig_error) { | |
| 131 CLEAR_PENDING_EXCEPTION; | |
| 132 ResourceMark rm; | |
| 133 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
| 134 THROW_MSG_0(error, className); | |
| 135 } | |
| 136 | |
| 137 return 0; | |
| 138 } | |
| 139 | |
| 140 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) { | |
| 141 // skip resolving the constant pool so that this code get's | |
| 142 // called the next time some bytecodes refer to this class. | |
| 143 ResourceMark rm; | |
| 144 int line_number = -1; | |
| 145 const char * source_file = NULL; | |
| 146 if (JavaThread::current()->has_last_Java_frame()) { | |
| 147 // try to identify the method which called this function. | |
| 148 vframeStream vfst(JavaThread::current()); | |
| 149 if (!vfst.at_end()) { | |
| 150 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
| 151 symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name(); | |
| 152 if (s != NULL) { | |
| 153 source_file = s->as_C_string(); | |
| 154 } | |
| 155 } | |
| 156 } | |
| 157 if (k() != this_oop->pool_holder()) { | |
| 158 // only print something if the classes are different | |
| 159 if (source_file != NULL) { | |
| 160 tty->print("RESOLVE %s %s %s:%d\n", | |
| 161 instanceKlass::cast(this_oop->pool_holder())->external_name(), | |
| 162 instanceKlass::cast(k())->external_name(), source_file, line_number); | |
| 163 } else { | |
| 164 tty->print("RESOLVE %s %s\n", | |
| 165 instanceKlass::cast(this_oop->pool_holder())->external_name(), | |
| 166 instanceKlass::cast(k())->external_name()); | |
| 167 } | |
| 168 } | |
| 169 return k(); | |
| 170 } else { | |
| 171 ObjectLocker ol (this_oop, THREAD); | |
| 172 // Only updated constant pool - if it is resolved. | |
| 173 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
| 174 if (do_resolve) { | |
| 175 this_oop->klass_at_put(which, k()); | |
| 176 } | |
| 177 } | |
| 178 } | |
| 179 | |
| 180 entry = this_oop->resolved_klass_at(which); | |
| 181 assert(entry->is_klass(), "must be resolved at this point"); | |
| 182 return (klassOop)entry; | |
| 183 } | |
| 184 | |
| 185 | |
| 186 // Does not update constantPoolOop - to avoid any exception throwing. Used | |
| 187 // by compiler and exception handling. Also used to avoid classloads for | |
| 188 // instanceof operations. Returns NULL if the class has not been loaded or | |
| 189 // if the verification of constant pool failed | |
| 190 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) { | |
| 191 oop entry = *this_oop->obj_at_addr(which); | |
| 192 if (entry->is_klass()) { | |
| 193 return (klassOop)entry; | |
| 194 } else { | |
| 195 assert(entry->is_symbol(), "must be either symbol or klass"); | |
| 196 Thread *thread = Thread::current(); | |
| 197 symbolHandle name (thread, (symbolOop)entry); | |
| 198 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader(); | |
| 199 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); | |
| 200 Handle h_prot (thread, protection_domain); | |
| 201 Handle h_loader (thread, loader); | |
| 202 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread); | |
| 203 | |
| 204 if (k != NULL) { | |
| 205 // Make sure that resolving is legal | |
| 206 EXCEPTION_MARK; | |
| 207 KlassHandle klass(THREAD, k); | |
| 208 // return NULL if verification fails | |
| 209 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
| 210 if (HAS_PENDING_EXCEPTION) { | |
| 211 CLEAR_PENDING_EXCEPTION; | |
| 212 return NULL; | |
| 213 } | |
| 214 return klass(); | |
| 215 } else { | |
| 216 return k; | |
| 217 } | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 | |
| 222 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { | |
| 223 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 // This is an interface for the compiler that allows accessing non-resolved entries | |
| 228 // in the constant pool - but still performs the validations tests. Must be used | |
| 229 // in a pre-parse of the compiler - to determine what it can do and not do. | |
| 230 // Note: We cannot update the ConstantPool from the vm_thread. | |
| 231 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { | |
| 232 int which = this_oop->klass_ref_index_at(index); | |
| 233 oop entry = *this_oop->obj_at_addr(which); | |
| 234 if (entry->is_klass()) { | |
| 235 return (klassOop)entry; | |
| 236 } else { | |
| 237 assert(entry->is_symbol(), "must be either symbol or klass"); | |
| 238 symbolHandle name (THREAD, (symbolOop)entry); | |
| 239 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader(); | |
| 240 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); | |
| 241 Handle h_loader(THREAD, loader); | |
| 242 Handle h_prot (THREAD, protection_domain); | |
| 243 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
| 244 | |
| 245 // Do access check for klasses | |
| 246 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
| 247 return k(); | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 | |
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252 symbolOop constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) { |
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253 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
| 0 | 254 return symbol_at(name_index); |
| 255 } | |
| 256 | |
| 257 | |
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258 symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) { |
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259 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
| 0 | 260 return symbol_at(signature_index); |
| 261 } | |
| 262 | |
| 263 | |
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264 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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265 int i = which; |
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266 if (!uncached && cache() != NULL) { |
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267 if (constantPoolCacheOopDesc::is_secondary_index(which)) { |
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268 // Invokedynamic indexes are always processed in native order |
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269 // so there is no question of reading a native u2 in Java order here. |
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270 int pool_index = cache()->main_entry_at(which)->constant_pool_index(); |
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271 if (tag_at(pool_index).is_invoke_dynamic()) |
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272 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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273 assert(tag_at(pool_index).is_name_and_type(), ""); |
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274 return pool_index; |
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275 } |
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276 // change byte-ordering and go via cache |
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277 i = remap_instruction_operand_from_cache(which); |
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278 } else { |
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279 if (tag_at(which).is_name_and_type()) |
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280 // invokedynamic index is a simple name-and-type |
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281 return which; |
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282 } |
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283 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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284 jint ref_index = *int_at_addr(i); |
| 0 | 285 return extract_high_short_from_int(ref_index); |
| 286 } | |
| 287 | |
| 288 | |
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289 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) { |
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290 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which), |
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291 "an invokedynamic instruction does not have a klass"); |
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292 int i = which; |
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293 if (!uncached && cache() != NULL) { |
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294 // change byte-ordering and go via cache |
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295 i = remap_instruction_operand_from_cache(which); |
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296 } |
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297 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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298 jint ref_index = *int_at_addr(i); |
| 0 | 299 return extract_low_short_from_int(ref_index); |
| 300 } | |
| 301 | |
| 302 | |
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303 |
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304 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) { |
| 1565 | 305 int cpc_index = operand; |
| 306 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
| 307 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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308 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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309 return member_index; |
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310 } |
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311 |
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312 |
| 0 | 313 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
| 314 if (k->oop_is_instance() || k->oop_is_objArray()) { | |
| 315 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
| 316 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass(); | |
| 317 KlassHandle element (THREAD, elem_oop); | |
| 318 | |
| 319 // The element type could be a typeArray - we only need the access check if it is | |
| 320 // an reference to another class | |
| 321 if (element->oop_is_instance()) { | |
| 322 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
| 323 } | |
| 324 } | |
| 325 } | |
| 326 | |
| 327 | |
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328 int constantPoolOopDesc::name_ref_index_at(int which_nt) { |
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329 jint ref_index = name_and_type_at(which_nt); |
| 0 | 330 return extract_low_short_from_int(ref_index); |
| 331 } | |
| 332 | |
| 333 | |
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334 int constantPoolOopDesc::signature_ref_index_at(int which_nt) { |
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335 jint ref_index = name_and_type_at(which_nt); |
| 0 | 336 return extract_high_short_from_int(ref_index); |
| 337 } | |
| 338 | |
| 339 | |
| 340 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) { | |
| 341 return klass_at(klass_ref_index_at(which), CHECK_NULL); | |
| 342 } | |
| 343 | |
| 344 | |
| 345 symbolOop constantPoolOopDesc::klass_name_at(int which) { | |
| 346 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), | |
| 347 "Corrupted constant pool"); | |
| 348 // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop. | |
| 349 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and | |
| 350 // tag is not updated atomicly. | |
| 351 oop entry = *(obj_at_addr(which)); | |
| 352 if (entry->is_klass()) { | |
| 353 // Already resolved - return entry's name. | |
| 354 return klassOop(entry)->klass_part()->name(); | |
| 355 } else { | |
| 356 assert(entry->is_symbol(), "must be either symbol or klass"); | |
| 357 return (symbolOop)entry; | |
| 358 } | |
| 359 } | |
| 360 | |
| 361 symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) { | |
| 362 jint ref_index = klass_ref_index_at(which); | |
| 363 return klass_at_noresolve(ref_index); | |
| 364 } | |
| 365 | |
| 1602 | 366 symbolOop constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) { |
| 367 jint ref_index = uncached_klass_ref_index_at(which); | |
| 368 return klass_at_noresolve(ref_index); | |
| 369 } | |
| 370 | |
| 0 | 371 char* constantPoolOopDesc::string_at_noresolve(int which) { |
| 372 // Test entry type in case string is resolved while in here. | |
| 373 oop entry = *(obj_at_addr(which)); | |
| 374 if (entry->is_symbol()) { | |
| 375 return ((symbolOop)entry)->as_C_string(); | |
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376 } else if (java_lang_String::is_instance(entry)) { |
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377 return java_lang_String::as_utf8_string(entry); |
| 0 | 378 } else { |
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379 return (char*)"<pseudo-string>"; |
| 0 | 380 } |
| 381 } | |
| 382 | |
| 383 | |
| 384 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) { | |
| 385 return FieldType::basic_type(symbol_at(which)); | |
| 386 } | |
| 387 | |
| 388 | |
| 389 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { | |
| 390 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused | |
| 391 if (this_oop->tag_at(index).is_unresolved_string()) { | |
| 392 this_oop->string_at(index, CHECK); | |
| 393 } | |
| 394 } | |
| 395 } | |
| 396 | |
| 1602 | 397 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
| 398 oop result_oop = NULL; | |
| 399 if (cache_index >= 0) { | |
| 400 assert(index < 0, "only one kind of index at a time"); | |
| 401 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index); | |
| 402 result_oop = cpc_entry->f1(); | |
| 403 if (result_oop != NULL) { | |
| 404 return result_oop; // that was easy... | |
| 405 } | |
| 406 index = cpc_entry->constant_pool_index(); | |
| 407 } | |
| 408 | |
| 409 int tag_value = this_oop->tag_at(index).value(); | |
| 410 switch (tag_value) { | |
| 411 | |
| 412 case JVM_CONSTANT_UnresolvedClass: | |
| 413 case JVM_CONSTANT_UnresolvedClassInError: | |
| 414 case JVM_CONSTANT_Class: | |
| 415 { | |
| 416 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL); | |
| 417 // ldc wants the java mirror. | |
| 418 result_oop = resolved->klass_part()->java_mirror(); | |
| 419 break; | |
| 420 } | |
| 421 | |
| 422 case JVM_CONSTANT_String: | |
| 423 case JVM_CONSTANT_UnresolvedString: | |
| 424 if (this_oop->is_pseudo_string_at(index)) { | |
| 425 result_oop = this_oop->pseudo_string_at(index); | |
| 426 break; | |
| 427 } | |
| 428 result_oop = string_at_impl(this_oop, index, CHECK_NULL); | |
| 429 break; | |
| 430 | |
| 431 case JVM_CONSTANT_Object: | |
| 432 result_oop = this_oop->object_at(index); | |
| 433 break; | |
| 434 | |
| 435 case JVM_CONSTANT_MethodHandle: | |
| 436 { | |
| 437 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
| 438 int callee_index = this_oop->method_handle_klass_index_at(index); | |
| 439 symbolHandle name(THREAD, this_oop->method_handle_name_ref_at(index)); | |
| 440 symbolHandle signature(THREAD, this_oop->method_handle_signature_ref_at(index)); | |
| 441 if (PrintMiscellaneous) | |
| 442 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
| 443 ref_kind, index, this_oop->method_handle_index_at(index), | |
| 444 callee_index, name->as_C_string(), signature->as_C_string()); | |
| 445 KlassHandle callee; | |
| 446 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL); | |
| 447 callee = KlassHandle(THREAD, k); | |
| 448 } | |
| 449 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
| 450 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
| 451 callee, name, signature, | |
| 452 CHECK_NULL); | |
| 453 result_oop = value(); | |
| 454 // FIXME: Uniquify errors, using SystemDictionary::find_resolution_error. | |
| 455 break; | |
| 456 } | |
| 457 | |
| 458 case JVM_CONSTANT_MethodType: | |
| 459 { | |
| 460 symbolHandle signature(THREAD, this_oop->method_type_signature_at(index)); | |
| 461 if (PrintMiscellaneous) | |
| 462 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
| 463 index, this_oop->method_type_index_at(index), | |
| 464 signature->as_C_string()); | |
| 465 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
| 466 bool ignore_is_on_bcp = false; | |
| 467 Handle value = SystemDictionary::find_method_handle_type(signature, | |
| 468 klass, | |
| 469 ignore_is_on_bcp, | |
| 470 CHECK_NULL); | |
| 471 result_oop = value(); | |
| 472 // FIXME: Uniquify errors, using SystemDictionary::find_resolution_error. | |
| 473 break; | |
| 474 } | |
| 475 | |
| 476 /* maybe some day | |
| 477 case JVM_CONSTANT_Integer: | |
| 478 case JVM_CONSTANT_Float: | |
| 479 case JVM_CONSTANT_Long: | |
| 480 case JVM_CONSTANT_Double: | |
| 481 result_oop = java_lang_boxing_object::create(...); | |
| 482 break; | |
| 483 */ | |
| 484 | |
| 485 default: | |
| 486 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
| 487 this_oop(), index, cache_index, tag_value) ); | |
| 488 assert(false, "unexpected constant tag"); | |
| 489 break; | |
| 490 } | |
| 491 | |
| 492 if (cache_index >= 0) { | |
| 493 // Cache the oop here also. | |
| 494 Handle result(THREAD, result_oop); | |
| 495 result_oop = NULL; // safety | |
| 496 ObjectLocker ol(this_oop, THREAD); | |
| 497 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index); | |
| 498 oop result_oop2 = cpc_entry->f1(); | |
| 499 if (result_oop2 != NULL) { | |
| 500 // Race condition: May already be filled in while we were trying to lock. | |
| 501 return result_oop2; | |
| 502 } | |
| 503 cpc_entry->set_f1(result()); | |
| 504 return result(); | |
| 505 } else { | |
| 506 return result_oop; | |
| 507 } | |
| 508 } | |
| 509 | |
| 0 | 510 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
| 511 oop entry = *(this_oop->obj_at_addr(which)); | |
| 512 if (entry->is_symbol()) { | |
| 513 ObjectLocker ol(this_oop, THREAD); | |
| 514 if (this_oop->tag_at(which).is_unresolved_string()) { | |
| 515 // Intern string | |
| 516 symbolOop sym = this_oop->unresolved_string_at(which); | |
| 517 entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL))); | |
| 518 this_oop->string_at_put(which, entry); | |
| 519 } else { | |
| 520 // Another thread beat us and interned string, read string from constant pool | |
| 521 entry = this_oop->resolved_string_at(which); | |
| 522 } | |
| 523 } | |
| 524 assert(java_lang_String::is_instance(entry), "must be string"); | |
| 525 return entry; | |
| 526 } | |
| 527 | |
| 528 | |
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529 bool constantPoolOopDesc::is_pseudo_string_at(int which) { |
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530 oop entry = *(obj_at_addr(which)); |
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531 if (entry->is_symbol()) |
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532 // Not yet resolved, but it will resolve to a string. |
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533 return false; |
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534 else if (java_lang_String::is_instance(entry)) |
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535 return false; // actually, it might be a non-interned or non-perm string |
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536 else |
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537 // truly pseudo |
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538 return true; |
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539 } |
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540 |
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541 |
| 0 | 542 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k, |
| 543 int which) { | |
| 544 // Names are interned, so we can compare symbolOops directly | |
| 545 symbolOop cp_name = klass_name_at(which); | |
| 546 return (cp_name == k->name()); | |
| 547 } | |
| 548 | |
| 549 | |
| 550 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) { | |
| 551 ResourceMark rm; | |
| 552 int count = 0; | |
| 553 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused | |
| 554 if (tag_at(index).is_unresolved_string()) { | |
| 555 // Intern string | |
| 556 symbolOop sym = unresolved_string_at(index); | |
| 557 oop entry = StringTable::intern(sym, CHECK_(-1)); | |
| 558 string_at_put(index, entry); | |
| 559 } | |
| 560 } | |
| 561 return count; | |
| 562 } | |
| 563 | |
| 564 | |
| 565 // Iterate over symbols which are used as class, field, method names and | |
| 566 // signatures (in preparation for writing to the shared archive). | |
| 567 | |
| 568 void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) { | |
| 569 for (int index = 1; index < length(); index++) { // Index 0 is unused | |
| 570 switch (tag_at(index).value()) { | |
| 571 | |
| 572 case JVM_CONSTANT_UnresolvedClass: | |
| 573 closure->do_oop(obj_at_addr(index)); | |
| 574 break; | |
| 575 | |
| 576 case JVM_CONSTANT_NameAndType: | |
| 577 { | |
| 578 int i = *int_at_addr(index); | |
| 579 closure->do_oop(obj_at_addr((unsigned)i >> 16)); | |
| 580 closure->do_oop(obj_at_addr((unsigned)i & 0xffff)); | |
| 581 } | |
| 582 break; | |
| 583 | |
| 584 case JVM_CONSTANT_Class: | |
| 585 case JVM_CONSTANT_InterfaceMethodref: | |
| 586 case JVM_CONSTANT_Fieldref: | |
| 587 case JVM_CONSTANT_Methodref: | |
| 588 case JVM_CONSTANT_Integer: | |
| 589 case JVM_CONSTANT_Float: | |
| 590 // Do nothing! Not an oop. | |
| 591 // These constant types do not reference symbols at this point. | |
| 592 break; | |
| 593 | |
| 594 case JVM_CONSTANT_String: | |
| 595 // Do nothing! Not a symbol. | |
| 596 break; | |
| 597 | |
| 598 case JVM_CONSTANT_UnresolvedString: | |
| 599 case JVM_CONSTANT_Utf8: | |
| 600 // These constants are symbols, but unless these symbols are | |
| 601 // actually to be used for something, we don't want to mark them. | |
| 602 break; | |
| 603 | |
| 604 case JVM_CONSTANT_Long: | |
| 605 case JVM_CONSTANT_Double: | |
| 606 // Do nothing! Not an oop. (But takes two pool entries.) | |
| 607 ++index; | |
| 608 break; | |
| 609 | |
| 610 default: | |
| 611 ShouldNotReachHere(); | |
| 612 break; | |
| 613 } | |
| 614 } | |
| 615 } | |
| 616 | |
| 617 | |
| 618 // Iterate over the [one] tags array (in preparation for writing to the | |
| 619 // shared archive). | |
| 620 | |
| 621 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) { | |
| 622 closure->do_oop(tags_addr()); | |
| 623 } | |
| 624 | |
| 625 | |
| 626 // Iterate over String objects (in preparation for writing to the shared | |
| 627 // archive). | |
| 628 | |
| 629 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) { | |
| 630 for (int index = 1; index < length(); index++) { // Index 0 is unused | |
| 631 switch (tag_at(index).value()) { | |
| 632 | |
| 633 case JVM_CONSTANT_UnresolvedClass: | |
| 634 case JVM_CONSTANT_NameAndType: | |
| 635 // Do nothing! Not a String. | |
| 636 break; | |
| 637 | |
| 638 case JVM_CONSTANT_Class: | |
| 639 case JVM_CONSTANT_InterfaceMethodref: | |
| 640 case JVM_CONSTANT_Fieldref: | |
| 641 case JVM_CONSTANT_Methodref: | |
| 642 case JVM_CONSTANT_Integer: | |
| 643 case JVM_CONSTANT_Float: | |
| 644 // Do nothing! Not an oop. | |
| 645 // These constant types do not reference symbols at this point. | |
| 646 break; | |
| 647 | |
| 648 case JVM_CONSTANT_String: | |
| 649 closure->do_oop(obj_at_addr(index)); | |
| 650 break; | |
| 651 | |
| 652 case JVM_CONSTANT_UnresolvedString: | |
| 653 case JVM_CONSTANT_Utf8: | |
| 654 // These constants are symbols, but unless these symbols are | |
| 655 // actually to be used for something, we don't want to mark them. | |
| 656 break; | |
| 657 | |
| 658 case JVM_CONSTANT_Long: | |
| 659 case JVM_CONSTANT_Double: | |
| 660 // Do nothing! Not an oop. (But takes two pool entries.) | |
| 661 ++index; | |
| 662 break; | |
| 663 | |
| 664 default: | |
| 665 ShouldNotReachHere(); | |
| 666 break; | |
| 667 } | |
| 668 } | |
| 669 } | |
| 670 | |
| 671 | |
| 672 // Compare this constant pool's entry at index1 to the constant pool | |
| 673 // cp2's entry at index2. | |
| 674 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2, | |
| 675 int index2, TRAPS) { | |
| 676 | |
| 677 jbyte t1 = tag_at(index1).value(); | |
| 678 jbyte t2 = cp2->tag_at(index2).value(); | |
| 679 | |
| 680 | |
| 681 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
| 682 // when comparing | |
| 683 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
| 684 t1 = JVM_CONSTANT_UnresolvedClass; | |
| 685 } | |
| 686 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
| 687 t2 = JVM_CONSTANT_UnresolvedClass; | |
| 688 } | |
| 689 | |
| 690 if (t1 != t2) { | |
| 691 // Not the same entry type so there is nothing else to check. Note | |
| 692 // that this style of checking will consider resolved/unresolved | |
| 693 // class pairs and resolved/unresolved string pairs as different. | |
| 694 // From the constantPoolOop API point of view, this is correct | |
| 695 // behavior. See constantPoolKlass::merge() to see how this plays | |
| 696 // out in the context of constantPoolOop merging. | |
| 697 return false; | |
| 698 } | |
| 699 | |
| 700 switch (t1) { | |
| 701 case JVM_CONSTANT_Class: | |
| 702 { | |
| 703 klassOop k1 = klass_at(index1, CHECK_false); | |
| 704 klassOop k2 = cp2->klass_at(index2, CHECK_false); | |
| 705 if (k1 == k2) { | |
| 706 return true; | |
| 707 } | |
| 708 } break; | |
| 709 | |
| 710 case JVM_CONSTANT_ClassIndex: | |
| 711 { | |
| 712 int recur1 = klass_index_at(index1); | |
| 713 int recur2 = cp2->klass_index_at(index2); | |
| 714 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 715 if (match) { | |
| 716 return true; | |
| 717 } | |
| 718 } break; | |
| 719 | |
| 720 case JVM_CONSTANT_Double: | |
| 721 { | |
| 722 jdouble d1 = double_at(index1); | |
| 723 jdouble d2 = cp2->double_at(index2); | |
| 724 if (d1 == d2) { | |
| 725 return true; | |
| 726 } | |
| 727 } break; | |
| 728 | |
| 729 case JVM_CONSTANT_Fieldref: | |
| 730 case JVM_CONSTANT_InterfaceMethodref: | |
| 731 case JVM_CONSTANT_Methodref: | |
| 732 { | |
| 733 int recur1 = uncached_klass_ref_index_at(index1); | |
| 734 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
| 735 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 736 if (match) { | |
| 737 recur1 = uncached_name_and_type_ref_index_at(index1); | |
| 738 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
| 739 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 740 if (match) { | |
| 741 return true; | |
| 742 } | |
| 743 } | |
| 744 } break; | |
| 745 | |
| 746 case JVM_CONSTANT_Float: | |
| 747 { | |
| 748 jfloat f1 = float_at(index1); | |
| 749 jfloat f2 = cp2->float_at(index2); | |
| 750 if (f1 == f2) { | |
| 751 return true; | |
| 752 } | |
| 753 } break; | |
| 754 | |
| 755 case JVM_CONSTANT_Integer: | |
| 756 { | |
| 757 jint i1 = int_at(index1); | |
| 758 jint i2 = cp2->int_at(index2); | |
| 759 if (i1 == i2) { | |
| 760 return true; | |
| 761 } | |
| 762 } break; | |
| 763 | |
| 764 case JVM_CONSTANT_Long: | |
| 765 { | |
| 766 jlong l1 = long_at(index1); | |
| 767 jlong l2 = cp2->long_at(index2); | |
| 768 if (l1 == l2) { | |
| 769 return true; | |
| 770 } | |
| 771 } break; | |
| 772 | |
| 773 case JVM_CONSTANT_NameAndType: | |
| 774 { | |
| 775 int recur1 = name_ref_index_at(index1); | |
| 776 int recur2 = cp2->name_ref_index_at(index2); | |
| 777 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 778 if (match) { | |
| 779 recur1 = signature_ref_index_at(index1); | |
| 780 recur2 = cp2->signature_ref_index_at(index2); | |
| 781 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 782 if (match) { | |
| 783 return true; | |
| 784 } | |
| 785 } | |
| 786 } break; | |
| 787 | |
| 788 case JVM_CONSTANT_String: | |
| 789 { | |
| 790 oop s1 = string_at(index1, CHECK_false); | |
| 791 oop s2 = cp2->string_at(index2, CHECK_false); | |
| 792 if (s1 == s2) { | |
| 793 return true; | |
| 794 } | |
| 795 } break; | |
| 796 | |
| 797 case JVM_CONSTANT_StringIndex: | |
| 798 { | |
| 799 int recur1 = string_index_at(index1); | |
| 800 int recur2 = cp2->string_index_at(index2); | |
| 801 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
| 802 if (match) { | |
| 803 return true; | |
| 804 } | |
| 805 } break; | |
| 806 | |
| 807 case JVM_CONSTANT_UnresolvedClass: | |
| 808 { | |
| 809 symbolOop k1 = unresolved_klass_at(index1); | |
| 810 symbolOop k2 = cp2->unresolved_klass_at(index2); | |
| 811 if (k1 == k2) { | |
| 812 return true; | |
| 813 } | |
| 814 } break; | |
| 815 | |
| 1602 | 816 case JVM_CONSTANT_MethodType: |
| 817 { | |
| 818 int k1 = method_type_index_at(index1); | |
| 819 int k2 = cp2->method_type_index_at(index2); | |
| 820 if (k1 == k2) { | |
| 821 return true; | |
| 822 } | |
| 823 } break; | |
| 824 | |
| 825 case JVM_CONSTANT_MethodHandle: | |
| 826 { | |
| 827 int k1 = method_handle_ref_kind_at(index1); | |
| 828 int k2 = cp2->method_handle_ref_kind_at(index2); | |
| 829 if (k1 == k2) { | |
| 830 int i1 = method_handle_index_at(index1); | |
| 831 int i2 = cp2->method_handle_index_at(index2); | |
| 832 if (i1 == i2) { | |
| 833 return true; | |
| 834 } | |
| 835 } | |
| 836 } break; | |
| 837 | |
|
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838 case JVM_CONSTANT_InvokeDynamic: |
|
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839 { |
|
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840 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1); |
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841 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2); |
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842 if (k1 == k2) { |
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843 int i1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
|
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844 int i2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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845 if (i1 == i2) { |
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846 return true; |
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847 } |
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848 } |
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849 } break; |
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850 |
| 0 | 851 case JVM_CONSTANT_UnresolvedString: |
| 852 { | |
| 853 symbolOop s1 = unresolved_string_at(index1); | |
| 854 symbolOop s2 = cp2->unresolved_string_at(index2); | |
| 855 if (s1 == s2) { | |
| 856 return true; | |
| 857 } | |
| 858 } break; | |
| 859 | |
| 860 case JVM_CONSTANT_Utf8: | |
| 861 { | |
| 862 symbolOop s1 = symbol_at(index1); | |
| 863 symbolOop s2 = cp2->symbol_at(index2); | |
| 864 if (s1 == s2) { | |
| 865 return true; | |
| 866 } | |
| 867 } break; | |
| 868 | |
| 869 // Invalid is used as the tag for the second constant pool entry | |
| 870 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
| 871 // not be seen by itself. | |
| 872 case JVM_CONSTANT_Invalid: // fall through | |
| 873 | |
| 874 default: | |
| 875 ShouldNotReachHere(); | |
| 876 break; | |
| 877 } | |
| 878 | |
| 879 return false; | |
| 880 } // end compare_entry_to() | |
| 881 | |
| 882 | |
| 883 // Copy this constant pool's entries at start_i to end_i (inclusive) | |
| 884 // to the constant pool to_cp's entries starting at to_i. A total of | |
| 885 // (end_i - start_i) + 1 entries are copied. | |
| 886 void constantPoolOopDesc::copy_cp_to(int start_i, int end_i, | |
| 887 constantPoolHandle to_cp, int to_i, TRAPS) { | |
| 888 | |
| 889 int dest_i = to_i; // leave original alone for debug purposes | |
| 890 | |
| 891 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { | |
| 892 copy_entry_to(src_i, to_cp, dest_i, CHECK); | |
| 893 | |
| 894 switch (tag_at(src_i).value()) { | |
| 895 case JVM_CONSTANT_Double: | |
| 896 case JVM_CONSTANT_Long: | |
| 897 // double and long take two constant pool entries | |
| 898 src_i += 2; | |
| 899 dest_i += 2; | |
| 900 break; | |
| 901 | |
| 902 default: | |
| 903 // all others take one constant pool entry | |
| 904 src_i++; | |
| 905 dest_i++; | |
| 906 break; | |
| 907 } | |
| 908 } | |
| 909 } // end copy_cp_to() | |
| 910 | |
| 911 | |
| 912 // Copy this constant pool's entry at from_i to the constant pool | |
| 913 // to_cp's entry at to_i. | |
| 914 void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp, | |
| 915 int to_i, TRAPS) { | |
| 916 | |
| 917 switch (tag_at(from_i).value()) { | |
| 918 case JVM_CONSTANT_Class: | |
| 919 { | |
| 920 klassOop k = klass_at(from_i, CHECK); | |
| 921 to_cp->klass_at_put(to_i, k); | |
| 922 } break; | |
| 923 | |
| 924 case JVM_CONSTANT_ClassIndex: | |
| 925 { | |
| 926 jint ki = klass_index_at(from_i); | |
| 927 to_cp->klass_index_at_put(to_i, ki); | |
| 928 } break; | |
| 929 | |
| 930 case JVM_CONSTANT_Double: | |
| 931 { | |
| 932 jdouble d = double_at(from_i); | |
| 933 to_cp->double_at_put(to_i, d); | |
| 934 // double takes two constant pool entries so init second entry's tag | |
| 935 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
| 936 } break; | |
| 937 | |
| 938 case JVM_CONSTANT_Fieldref: | |
| 939 { | |
| 940 int class_index = uncached_klass_ref_index_at(from_i); | |
| 941 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i); | |
| 942 to_cp->field_at_put(to_i, class_index, name_and_type_index); | |
| 943 } break; | |
| 944 | |
| 945 case JVM_CONSTANT_Float: | |
| 946 { | |
| 947 jfloat f = float_at(from_i); | |
| 948 to_cp->float_at_put(to_i, f); | |
| 949 } break; | |
| 950 | |
| 951 case JVM_CONSTANT_Integer: | |
| 952 { | |
| 953 jint i = int_at(from_i); | |
| 954 to_cp->int_at_put(to_i, i); | |
| 955 } break; | |
| 956 | |
| 957 case JVM_CONSTANT_InterfaceMethodref: | |
| 958 { | |
| 959 int class_index = uncached_klass_ref_index_at(from_i); | |
| 960 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i); | |
| 961 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); | |
| 962 } break; | |
| 963 | |
| 964 case JVM_CONSTANT_Long: | |
| 965 { | |
| 966 jlong l = long_at(from_i); | |
| 967 to_cp->long_at_put(to_i, l); | |
| 968 // long takes two constant pool entries so init second entry's tag | |
| 969 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
| 970 } break; | |
| 971 | |
| 972 case JVM_CONSTANT_Methodref: | |
| 973 { | |
| 974 int class_index = uncached_klass_ref_index_at(from_i); | |
| 975 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i); | |
| 976 to_cp->method_at_put(to_i, class_index, name_and_type_index); | |
| 977 } break; | |
| 978 | |
| 979 case JVM_CONSTANT_NameAndType: | |
| 980 { | |
| 981 int name_ref_index = name_ref_index_at(from_i); | |
| 982 int signature_ref_index = signature_ref_index_at(from_i); | |
| 983 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); | |
| 984 } break; | |
| 985 | |
| 986 case JVM_CONSTANT_String: | |
| 987 { | |
| 988 oop s = string_at(from_i, CHECK); | |
| 989 to_cp->string_at_put(to_i, s); | |
| 990 } break; | |
| 991 | |
| 992 case JVM_CONSTANT_StringIndex: | |
| 993 { | |
| 994 jint si = string_index_at(from_i); | |
| 995 to_cp->string_index_at_put(to_i, si); | |
| 996 } break; | |
| 997 | |
| 998 case JVM_CONSTANT_UnresolvedClass: | |
| 999 { | |
| 1000 symbolOop k = unresolved_klass_at(from_i); | |
| 1001 to_cp->unresolved_klass_at_put(to_i, k); | |
| 1002 } break; | |
| 1003 | |
| 1004 case JVM_CONSTANT_UnresolvedClassInError: | |
| 1005 { | |
| 1006 symbolOop k = unresolved_klass_at(from_i); | |
| 1007 to_cp->unresolved_klass_at_put(to_i, k); | |
| 1008 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
| 1009 } break; | |
| 1010 | |
| 1011 | |
| 1012 case JVM_CONSTANT_UnresolvedString: | |
| 1013 { | |
| 1014 symbolOop s = unresolved_string_at(from_i); | |
| 1015 to_cp->unresolved_string_at_put(to_i, s); | |
| 1016 } break; | |
| 1017 | |
| 1018 case JVM_CONSTANT_Utf8: | |
| 1019 { | |
| 1020 symbolOop s = symbol_at(from_i); | |
| 1021 to_cp->symbol_at_put(to_i, s); | |
| 1022 } break; | |
| 1023 | |
| 1602 | 1024 case JVM_CONSTANT_MethodType: |
| 1025 { | |
| 1026 jint k = method_type_index_at(from_i); | |
| 1027 to_cp->method_type_index_at_put(to_i, k); | |
| 1028 } break; | |
| 1029 | |
| 1030 case JVM_CONSTANT_MethodHandle: | |
| 1031 { | |
| 1032 int k1 = method_handle_ref_kind_at(from_i); | |
| 1033 int k2 = method_handle_index_at(from_i); | |
| 1034 to_cp->method_handle_index_at_put(to_i, k1, k2); | |
| 1035 } break; | |
| 1036 | |
|
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1037 case JVM_CONSTANT_InvokeDynamic: |
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1038 { |
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1039 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(from_i); |
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1040 int k2 = invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1041 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
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1042 } break; |
|
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1043 |
| 0 | 1044 // Invalid is used as the tag for the second constant pool entry |
| 1045 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
| 1046 // not be seen by itself. | |
| 1047 case JVM_CONSTANT_Invalid: // fall through | |
| 1048 | |
| 1049 default: | |
| 1050 { | |
| 1051 jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb | |
| 1052 ShouldNotReachHere(); | |
| 1053 } break; | |
| 1054 } | |
| 1055 } // end copy_entry_to() | |
| 1056 | |
| 1057 | |
| 1058 // Search constant pool search_cp for an entry that matches this | |
| 1059 // constant pool's entry at pattern_i. Returns the index of a | |
| 1060 // matching entry or zero (0) if there is no matching entry. | |
| 1061 int constantPoolOopDesc::find_matching_entry(int pattern_i, | |
| 1062 constantPoolHandle search_cp, TRAPS) { | |
| 1063 | |
| 1064 // index zero (0) is not used | |
| 1065 for (int i = 1; i < search_cp->length(); i++) { | |
| 1066 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
| 1067 if (found) { | |
| 1068 return i; | |
| 1069 } | |
| 1070 } | |
| 1071 | |
| 1072 return 0; // entry not found; return unused index zero (0) | |
| 1073 } // end find_matching_entry() | |
| 1074 | |
| 1075 | |
| 1076 #ifndef PRODUCT | |
| 1077 | |
| 1078 const char* constantPoolOopDesc::printable_name_at(int which) { | |
| 1079 | |
| 1080 constantTag tag = tag_at(which); | |
| 1081 | |
| 1082 if (tag.is_unresolved_string() || tag.is_string()) { | |
| 1083 return string_at_noresolve(which); | |
| 1084 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
| 1085 return klass_name_at(which)->as_C_string(); | |
| 1086 } else if (tag.is_symbol()) { | |
| 1087 return symbol_at(which)->as_C_string(); | |
| 1088 } | |
| 1089 return ""; | |
| 1090 } | |
| 1091 | |
| 1092 #endif // PRODUCT | |
| 1093 | |
| 1094 | |
| 1095 // JVMTI GetConstantPool support | |
| 1096 | |
| 1097 // For temporary use until code is stable. | |
| 1098 #define DBG(code) | |
| 1099 | |
| 1100 static const char* WARN_MSG = "Must not be such entry!"; | |
| 1101 | |
| 1102 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
| 1103 jint size = 0; | |
| 1104 u2 idx1, idx2; | |
| 1105 | |
| 1106 for (jint idx = 1; idx < cnt; idx++) { | |
| 1107 jint ent_size = 0; | |
| 1108 u1 tag = *bytes++; | |
| 1109 size++; // count tag | |
| 1110 | |
| 1111 printf("const #%03d, tag: %02d ", idx, tag); | |
| 1112 switch(tag) { | |
| 1113 case JVM_CONSTANT_Invalid: { | |
| 1114 printf("Invalid"); | |
| 1115 break; | |
| 1116 } | |
| 1117 case JVM_CONSTANT_Unicode: { | |
| 1118 printf("Unicode %s", WARN_MSG); | |
| 1119 break; | |
| 1120 } | |
| 1121 case JVM_CONSTANT_Utf8: { | |
| 1122 u2 len = Bytes::get_Java_u2(bytes); | |
| 1123 char str[128]; | |
| 1124 if (len > 127) { | |
| 1125 len = 127; | |
| 1126 } | |
| 1127 strncpy(str, (char *) (bytes+2), len); | |
| 1128 str[len] = '\0'; | |
| 1129 printf("Utf8 \"%s\"", str); | |
| 1130 ent_size = 2 + len; | |
| 1131 break; | |
| 1132 } | |
| 1133 case JVM_CONSTANT_Integer: { | |
| 1134 u4 val = Bytes::get_Java_u4(bytes); | |
| 1135 printf("int %d", *(int *) &val); | |
| 1136 ent_size = 4; | |
| 1137 break; | |
| 1138 } | |
| 1139 case JVM_CONSTANT_Float: { | |
| 1140 u4 val = Bytes::get_Java_u4(bytes); | |
| 1141 printf("float %5.3ff", *(float *) &val); | |
| 1142 ent_size = 4; | |
| 1143 break; | |
| 1144 } | |
| 1145 case JVM_CONSTANT_Long: { | |
| 1146 u8 val = Bytes::get_Java_u8(bytes); | |
|
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1147 printf("long "INT64_FORMAT, *(jlong *) &val); |
| 0 | 1148 ent_size = 8; |
| 1149 idx++; // Long takes two cpool slots | |
| 1150 break; | |
| 1151 } | |
| 1152 case JVM_CONSTANT_Double: { | |
| 1153 u8 val = Bytes::get_Java_u8(bytes); | |
| 1154 printf("double %5.3fd", *(jdouble *)&val); | |
| 1155 ent_size = 8; | |
| 1156 idx++; // Double takes two cpool slots | |
| 1157 break; | |
| 1158 } | |
| 1159 case JVM_CONSTANT_Class: { | |
| 1160 idx1 = Bytes::get_Java_u2(bytes); | |
| 1161 printf("class #%03d", idx1); | |
| 1162 ent_size = 2; | |
| 1163 break; | |
| 1164 } | |
| 1165 case JVM_CONSTANT_String: { | |
| 1166 idx1 = Bytes::get_Java_u2(bytes); | |
| 1167 printf("String #%03d", idx1); | |
| 1168 ent_size = 2; | |
| 1169 break; | |
| 1170 } | |
| 1171 case JVM_CONSTANT_Fieldref: { | |
| 1172 idx1 = Bytes::get_Java_u2(bytes); | |
| 1173 idx2 = Bytes::get_Java_u2(bytes+2); | |
| 1174 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
| 1175 ent_size = 4; | |
| 1176 break; | |
| 1177 } | |
| 1178 case JVM_CONSTANT_Methodref: { | |
| 1179 idx1 = Bytes::get_Java_u2(bytes); | |
| 1180 idx2 = Bytes::get_Java_u2(bytes+2); | |
| 1181 printf("Method #%03d, #%03d", idx1, idx2); | |
| 1182 ent_size = 4; | |
| 1183 break; | |
| 1184 } | |
| 1185 case JVM_CONSTANT_InterfaceMethodref: { | |
| 1186 idx1 = Bytes::get_Java_u2(bytes); | |
| 1187 idx2 = Bytes::get_Java_u2(bytes+2); | |
| 1188 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
| 1189 ent_size = 4; | |
| 1190 break; | |
| 1191 } | |
| 1192 case JVM_CONSTANT_NameAndType: { | |
| 1193 idx1 = Bytes::get_Java_u2(bytes); | |
| 1194 idx2 = Bytes::get_Java_u2(bytes+2); | |
| 1195 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
| 1196 ent_size = 4; | |
| 1197 break; | |
| 1198 } | |
| 1199 case JVM_CONSTANT_ClassIndex: { | |
| 1200 printf("ClassIndex %s", WARN_MSG); | |
| 1201 break; | |
| 1202 } | |
| 1203 case JVM_CONSTANT_UnresolvedClass: { | |
| 1204 printf("UnresolvedClass: %s", WARN_MSG); | |
| 1205 break; | |
| 1206 } | |
| 1207 case JVM_CONSTANT_UnresolvedClassInError: { | |
| 1208 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
| 1209 break; | |
| 1210 } | |
| 1211 case JVM_CONSTANT_StringIndex: { | |
| 1212 printf("StringIndex: %s", WARN_MSG); | |
| 1213 break; | |
| 1214 } | |
| 1215 case JVM_CONSTANT_UnresolvedString: { | |
| 1216 printf("UnresolvedString: %s", WARN_MSG); | |
| 1217 break; | |
| 1218 } | |
| 1219 } | |
| 1220 printf(";\n"); | |
| 1221 bytes += ent_size; | |
| 1222 size += ent_size; | |
| 1223 } | |
| 1224 printf("Cpool size: %d\n", size); | |
| 1225 fflush(0); | |
| 1226 return; | |
| 1227 } /* end print_cpool_bytes */ | |
| 1228 | |
| 1229 | |
| 1230 // Returns size of constant pool entry. | |
| 1231 jint constantPoolOopDesc::cpool_entry_size(jint idx) { | |
| 1232 switch(tag_at(idx).value()) { | |
| 1233 case JVM_CONSTANT_Invalid: | |
| 1234 case JVM_CONSTANT_Unicode: | |
| 1235 return 1; | |
| 1236 | |
| 1237 case JVM_CONSTANT_Utf8: | |
| 1238 return 3 + symbol_at(idx)->utf8_length(); | |
| 1239 | |
| 1240 case JVM_CONSTANT_Class: | |
| 1241 case JVM_CONSTANT_String: | |
| 1242 case JVM_CONSTANT_ClassIndex: | |
| 1243 case JVM_CONSTANT_UnresolvedClass: | |
| 1244 case JVM_CONSTANT_UnresolvedClassInError: | |
| 1245 case JVM_CONSTANT_StringIndex: | |
| 1246 case JVM_CONSTANT_UnresolvedString: | |
| 1602 | 1247 case JVM_CONSTANT_MethodType: |
| 0 | 1248 return 3; |
| 1249 | |
| 1602 | 1250 case JVM_CONSTANT_MethodHandle: |
| 1251 return 4; //tag, ref_kind, ref_index | |
| 1252 | |
| 0 | 1253 case JVM_CONSTANT_Integer: |
| 1254 case JVM_CONSTANT_Float: | |
| 1255 case JVM_CONSTANT_Fieldref: | |
| 1256 case JVM_CONSTANT_Methodref: | |
| 1257 case JVM_CONSTANT_InterfaceMethodref: | |
| 1258 case JVM_CONSTANT_NameAndType: | |
|
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1259 case JVM_CONSTANT_InvokeDynamic: |
| 0 | 1260 return 5; |
| 1261 | |
| 1262 case JVM_CONSTANT_Long: | |
| 1263 case JVM_CONSTANT_Double: | |
| 1264 return 9; | |
| 1265 } | |
| 1266 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
| 1267 return 1; | |
| 1268 } /* end cpool_entry_size */ | |
| 1269 | |
| 1270 | |
| 1271 // SymbolHashMap is used to find a constant pool index from a string. | |
| 1272 // This function fills in SymbolHashMaps, one for utf8s and one for | |
| 1273 // class names, returns size of the cpool raw bytes. | |
| 1274 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap, | |
| 1275 SymbolHashMap *classmap) { | |
| 1276 jint size = 0; | |
| 1277 | |
| 1278 for (u2 idx = 1; idx < length(); idx++) { | |
| 1279 u2 tag = tag_at(idx).value(); | |
| 1280 size += cpool_entry_size(idx); | |
| 1281 | |
| 1282 switch(tag) { | |
| 1283 case JVM_CONSTANT_Utf8: { | |
| 1284 symbolOop sym = symbol_at(idx); | |
| 1285 symmap->add_entry(sym, idx); | |
| 1286 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
| 1287 break; | |
| 1288 } | |
| 1289 case JVM_CONSTANT_Class: | |
| 1290 case JVM_CONSTANT_UnresolvedClass: | |
| 1291 case JVM_CONSTANT_UnresolvedClassInError: { | |
| 1292 symbolOop sym = klass_name_at(idx); | |
| 1293 classmap->add_entry(sym, idx); | |
| 1294 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
| 1295 break; | |
| 1296 } | |
| 1297 case JVM_CONSTANT_Long: | |
| 1298 case JVM_CONSTANT_Double: { | |
| 1299 idx++; // Both Long and Double take two cpool slots | |
| 1300 break; | |
| 1301 } | |
| 1302 } | |
| 1303 } | |
| 1304 return size; | |
| 1305 } /* end hash_utf8_entries_to */ | |
| 1306 | |
| 1307 | |
| 1308 // Copy cpool bytes. | |
| 1309 // Returns: | |
| 1310 // 0, in case of OutOfMemoryError | |
| 1311 // -1, in case of internal error | |
| 1312 // > 0, count of the raw cpool bytes that have been copied | |
| 1313 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size, | |
| 1314 SymbolHashMap* tbl, | |
| 1315 unsigned char *bytes) { | |
| 1316 u2 idx1, idx2; | |
| 1317 jint size = 0; | |
| 1318 jint cnt = length(); | |
| 1319 unsigned char *start_bytes = bytes; | |
| 1320 | |
| 1321 for (jint idx = 1; idx < cnt; idx++) { | |
| 1322 u1 tag = tag_at(idx).value(); | |
| 1323 jint ent_size = cpool_entry_size(idx); | |
| 1324 | |
| 1325 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
| 1326 | |
| 1327 *bytes = tag; | |
| 1328 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
| 1329 switch(tag) { | |
| 1330 case JVM_CONSTANT_Invalid: { | |
| 1331 DBG(printf("JVM_CONSTANT_Invalid")); | |
| 1332 break; | |
| 1333 } | |
| 1334 case JVM_CONSTANT_Unicode: { | |
| 1335 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
| 1336 DBG(printf("JVM_CONSTANT_Unicode")); | |
| 1337 break; | |
| 1338 } | |
| 1339 case JVM_CONSTANT_Utf8: { | |
| 1340 symbolOop sym = symbol_at(idx); | |
| 1341 char* str = sym->as_utf8(); | |
| 1342 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
| 1343 int len = (int) strlen(str); | |
| 1344 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
| 1345 for (int i = 0; i < len; i++) { | |
| 1346 bytes[3+i] = (u1) str[i]; | |
| 1347 } | |
| 1348 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
| 1349 break; | |
| 1350 } | |
| 1351 case JVM_CONSTANT_Integer: { | |
| 1352 jint val = int_at(idx); | |
| 1353 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
| 1354 break; | |
| 1355 } | |
| 1356 case JVM_CONSTANT_Float: { | |
| 1357 jfloat val = float_at(idx); | |
| 1358 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
| 1359 break; | |
| 1360 } | |
| 1361 case JVM_CONSTANT_Long: { | |
| 1362 jlong val = long_at(idx); | |
| 1363 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
| 1364 idx++; // Long takes two cpool slots | |
| 1365 break; | |
| 1366 } | |
| 1367 case JVM_CONSTANT_Double: { | |
| 1368 jdouble val = double_at(idx); | |
| 1369 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
| 1370 idx++; // Double takes two cpool slots | |
| 1371 break; | |
| 1372 } | |
| 1373 case JVM_CONSTANT_Class: | |
| 1374 case JVM_CONSTANT_UnresolvedClass: | |
| 1375 case JVM_CONSTANT_UnresolvedClassInError: { | |
| 1376 *bytes = JVM_CONSTANT_Class; | |
| 1377 symbolOop sym = klass_name_at(idx); | |
| 1378 idx1 = tbl->symbol_to_value(sym); | |
| 1379 assert(idx1 != 0, "Have not found a hashtable entry"); | |
| 1380 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1381 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
| 1382 break; | |
| 1383 } | |
| 1384 case JVM_CONSTANT_String: { | |
| 1385 unsigned int hash; | |
| 1386 char *str = string_at_noresolve(idx); | |
| 1387 symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash); | |
|
773
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1388 if (sym == NULL) { |
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1389 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8 |
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1390 // this can happen with JVM TI; see CR 6839599 for more details |
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1391 oop string = *(obj_at_addr(idx)); |
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1392 assert(java_lang_String::is_instance(string),"Not a String"); |
|
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1393 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag)); |
|
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1394 idx1 = 0; |
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1395 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) { |
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1396 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) { |
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1397 int length; |
|
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1398 sym = cur->symbol(); |
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1399 jchar* chars = sym->as_unicode(length); |
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1400 if (java_lang_String::equals(string, chars, length)) { |
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1401 idx1 = cur->value(); |
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1402 DBG(printf("Index found: %d\n",idx1)); |
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1403 break; |
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1404 } |
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1405 } |
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1406 } |
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1407 } else { |
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1408 idx1 = tbl->symbol_to_value(sym); |
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1409 } |
| 0 | 1410 assert(idx1 != 0, "Have not found a hashtable entry"); |
| 1411 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1412 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str)); | |
| 1413 break; | |
| 1414 } | |
| 1415 case JVM_CONSTANT_UnresolvedString: { | |
| 1416 *bytes = JVM_CONSTANT_String; | |
| 1417 symbolOop sym = unresolved_string_at(idx); | |
| 1418 idx1 = tbl->symbol_to_value(sym); | |
| 1419 assert(idx1 != 0, "Have not found a hashtable entry"); | |
| 1420 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1421 DBG(char *str = sym->as_utf8()); | |
| 1422 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str)); | |
| 1423 break; | |
| 1424 } | |
| 1425 case JVM_CONSTANT_Fieldref: | |
| 1426 case JVM_CONSTANT_Methodref: | |
| 1427 case JVM_CONSTANT_InterfaceMethodref: { | |
| 1428 idx1 = uncached_klass_ref_index_at(idx); | |
| 1429 idx2 = uncached_name_and_type_ref_index_at(idx); | |
| 1430 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1431 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
| 1432 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
| 1433 break; | |
| 1434 } | |
| 1435 case JVM_CONSTANT_NameAndType: { | |
| 1436 idx1 = name_ref_index_at(idx); | |
| 1437 idx2 = signature_ref_index_at(idx); | |
| 1438 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1439 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
| 1440 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
| 1441 break; | |
| 1442 } | |
| 1443 case JVM_CONSTANT_ClassIndex: { | |
| 1444 *bytes = JVM_CONSTANT_Class; | |
| 1445 idx1 = klass_index_at(idx); | |
| 1446 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1447 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
| 1448 break; | |
| 1449 } | |
| 1450 case JVM_CONSTANT_StringIndex: { | |
| 1451 *bytes = JVM_CONSTANT_String; | |
| 1452 idx1 = string_index_at(idx); | |
| 1453 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1454 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
| 1455 break; | |
| 1456 } | |
| 1602 | 1457 case JVM_CONSTANT_MethodHandle: { |
| 1458 *bytes = JVM_CONSTANT_MethodHandle; | |
| 1459 int kind = method_handle_ref_kind_at(idx); | |
| 1460 idx1 = method_handle_index_at(idx); | |
| 1461 *(bytes+1) = (unsigned char) kind; | |
| 1462 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
| 1463 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
| 1464 break; | |
| 1465 } | |
| 1466 case JVM_CONSTANT_MethodType: { | |
| 1467 *bytes = JVM_CONSTANT_MethodType; | |
| 1468 idx1 = method_type_index_at(idx); | |
| 1469 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
| 1470 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
| 1471 break; | |
| 1472 } | |
|
1660
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1473 case JVM_CONSTANT_InvokeDynamic: { |
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1474 *bytes = JVM_CONSTANT_InvokeDynamic; |
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1475 idx1 = invoke_dynamic_bootstrap_method_ref_index_at(idx); |
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1476 idx2 = invoke_dynamic_name_and_type_ref_index_at(idx); |
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1477 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1478 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1479 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
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1480 break; |
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1481 } |
| 0 | 1482 } |
| 1483 DBG(printf("\n")); | |
| 1484 bytes += ent_size; | |
| 1485 size += ent_size; | |
| 1486 } | |
| 1487 assert(size == cpool_size, "Size mismatch"); | |
| 1488 | |
| 1489 // Keep temorarily for debugging until it's stable. | |
| 1490 DBG(print_cpool_bytes(cnt, start_bytes)); | |
| 1491 return (int)(bytes - start_bytes); | |
| 1492 } /* end copy_cpool_bytes */ | |
| 1493 | |
| 1494 | |
| 1495 void SymbolHashMap::add_entry(symbolOop sym, u2 value) { | |
| 1496 char *str = sym->as_utf8(); | |
| 1497 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
| 1498 unsigned int index = hash % table_size(); | |
| 1499 | |
| 1500 // check if already in map | |
| 1501 // we prefer the first entry since it is more likely to be what was used in | |
| 1502 // the class file | |
| 1503 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
| 1504 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
| 1505 if (en->hash() == hash && en->symbol() == sym) { | |
| 1506 return; // already there | |
| 1507 } | |
| 1508 } | |
| 1509 | |
| 1510 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
| 1511 entry->set_next(bucket(index)); | |
| 1512 _buckets[index].set_entry(entry); | |
| 1513 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
| 1514 } | |
| 1515 | |
| 1516 SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) { | |
| 1517 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); | |
| 1518 char *str = sym->as_utf8(); | |
| 1519 int len = sym->utf8_length(); | |
| 1520 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
| 1521 unsigned int index = hash % table_size(); | |
| 1522 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
| 1523 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
| 1524 if (en->hash() == hash && en->symbol() == sym) { | |
| 1525 return en; | |
| 1526 } | |
| 1527 } | |
| 1528 return NULL; | |
| 1529 } |