annotate src/share/vm/oops/constantPool.cpp @ 5435:7c29904fdfa2

8014956: nashorn/api/javaaccess/MethodAccessTest.java test fails on sparc-solaris 64 Summary: reference_map[] array had uninitialized junk that was causing a bogus bootstrap method to be found. Reviewed-by: hseigel, dcubed, sspitsyn
author coleenp
date Fri, 20 Sep 2013 18:34:00 -0400
parents e0c9a1d29eb4
children a7609ec351d6
rev   line source
duke@0 1 /*
coleenp@4108 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
trims@1472 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1472 20 * or visit www.oracle.com if you need additional information or have any
trims@1472 21 * questions.
duke@0 22 *
duke@0 23 */
duke@0 24
stefank@1885 25 #include "precompiled.hpp"
coleenp@3656 26 #include "classfile/classLoaderData.hpp"
stefank@1885 27 #include "classfile/javaClasses.hpp"
coleenp@4132 28 #include "classfile/metadataOnStackMark.hpp"
stefank@1885 29 #include "classfile/symbolTable.hpp"
stefank@1885 30 #include "classfile/systemDictionary.hpp"
stefank@1885 31 #include "classfile/vmSymbols.hpp"
stefank@1885 32 #include "interpreter/linkResolver.hpp"
acorn@4139 33 #include "memory/heapInspection.hpp"
coleenp@3656 34 #include "memory/metadataFactory.hpp"
stefank@1885 35 #include "memory/oopFactory.hpp"
coleenp@3656 36 #include "oops/constantPool.hpp"
stefank@1885 37 #include "oops/instanceKlass.hpp"
stefank@1885 38 #include "oops/objArrayKlass.hpp"
stefank@1885 39 #include "runtime/fieldType.hpp"
stefank@1885 40 #include "runtime/init.hpp"
coleenp@3656 41 #include "runtime/javaCalls.hpp"
stefank@1885 42 #include "runtime/signature.hpp"
iklam@4645 43 #include "runtime/synchronizer.hpp"
stefank@1885 44 #include "runtime/vframe.hpp"
duke@0 45
coleenp@3656 46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
coleenp@3656 47 // Tags are RW but comment below applies to tags also.
coleenp@3656 48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
coleenp@3656 49
coleenp@3656 50 int size = ConstantPool::size(length);
coleenp@3656 51
coleenp@3656 52 // CDS considerations:
coleenp@3656 53 // Allocate read-write but may be able to move to read-only at dumping time
coleenp@3656 54 // if all the klasses are resolved. The only other field that is writable is
coleenp@3656 55 // the resolved_references array, which is recreated at startup time.
coleenp@3656 56 // But that could be moved to InstanceKlass (although a pain to access from
coleenp@3656 57 // assembly code). Maybe it could be moved to the cpCache which is RW.
iklam@4873 58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags);
coleenp@3656 59 }
coleenp@3656 60
coleenp@3656 61 ConstantPool::ConstantPool(Array<u1>* tags) {
coleenp@3656 62 set_length(tags->length());
coleenp@3656 63 set_tags(NULL);
coleenp@3656 64 set_cache(NULL);
coleenp@3656 65 set_reference_map(NULL);
coleenp@3656 66 set_resolved_references(NULL);
coleenp@3656 67 set_operands(NULL);
coleenp@3656 68 set_pool_holder(NULL);
coleenp@3656 69 set_flags(0);
coleenp@4132 70
coleenp@3656 71 // only set to non-zero if constant pool is merged by RedefineClasses
coleenp@4108 72 set_version(0);
coleenp@3656 73
coleenp@3656 74 // initialize tag array
coleenp@3656 75 int length = tags->length();
coleenp@3656 76 for (int index = 0; index < length; index++) {
coleenp@3656 77 tags->at_put(index, JVM_CONSTANT_Invalid);
coleenp@3656 78 }
coleenp@3656 79 set_tags(tags);
coleenp@3656 80 }
coleenp@3656 81
coleenp@3656 82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
coleenp@3656 83 MetadataFactory::free_metadata(loader_data, cache());
coleenp@3656 84 set_cache(NULL);
coleenp@3656 85 MetadataFactory::free_array<jushort>(loader_data, operands());
coleenp@3656 86 set_operands(NULL);
coleenp@3656 87
coleenp@3656 88 release_C_heap_structures();
coleenp@3656 89
coleenp@3656 90 // free tag array
coleenp@3656 91 MetadataFactory::free_array<u1>(loader_data, tags());
coleenp@3656 92 set_tags(NULL);
coleenp@3656 93 }
coleenp@3656 94
coleenp@3656 95 void ConstantPool::release_C_heap_structures() {
coleenp@3656 96 // walk constant pool and decrement symbol reference counts
coleenp@3656 97 unreference_symbols();
coleenp@3656 98 }
coleenp@3656 99
coleenp@3656 100 objArrayOop ConstantPool::resolved_references() const {
coleenp@3656 101 return (objArrayOop)JNIHandles::resolve(_resolved_references);
coleenp@3656 102 }
coleenp@3656 103
coleenp@3656 104 // Create resolved_references array and mapping array for original cp indexes
coleenp@3656 105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
coleenp@3656 106 // to map it back for resolving and some unlikely miscellaneous uses.
coleenp@3656 107 // The objects created by invokedynamic are appended to this list.
coleenp@3656 108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
coleenp@3656 109 intStack reference_map,
coleenp@3656 110 int constant_pool_map_length,
coleenp@5435 111 TRAPS) {
coleenp@3656 112 // Initialized the resolved object cache.
coleenp@3656 113 int map_length = reference_map.length();
coleenp@3656 114 if (map_length > 0) {
coleenp@3656 115 // Only need mapping back to constant pool entries. The map isn't used for
coleenp@5435 116 // invokedynamic resolved_reference entries. For invokedynamic entries,
coleenp@5435 117 // the constant pool cache index has the mapping back to both the constant
coleenp@5435 118 // pool and to the resolved reference index.
coleenp@3656 119 if (constant_pool_map_length > 0) {
coleenp@5435 120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK);
coleenp@3656 121
coleenp@3656 122 for (int i = 0; i < constant_pool_map_length; i++) {
coleenp@3656 123 int x = reference_map.at(i);
coleenp@3656 124 assert(x == (int)(jushort) x, "klass index is too big");
coleenp@3656 125 om->at_put(i, (jushort)x);
coleenp@3656 126 }
coleenp@3656 127 set_reference_map(om);
coleenp@3656 128 }
coleenp@3656 129
coleenp@3656 130 // Create Java array for holding resolved strings, methodHandles,
coleenp@3656 131 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
coleenp@3656 132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
coleenp@3656 133 Handle refs_handle (THREAD, (oop)stom); // must handleize.
coleenp@3656 134 set_resolved_references(loader_data->add_handle(refs_handle));
coleenp@3656 135 }
coleenp@3656 136 }
coleenp@3656 137
coleenp@3656 138 // CDS support. Create a new resolved_references array.
coleenp@3656 139 void ConstantPool::restore_unshareable_info(TRAPS) {
coleenp@3664 140
coleenp@3664 141 // restore the C++ vtable from the shared archive
coleenp@3664 142 restore_vtable();
coleenp@3664 143
coleenp@3656 144 if (SystemDictionary::Object_klass_loaded()) {
coleenp@3656 145 // Recreate the object array and add to ClassLoaderData.
coleenp@3656 146 int map_length = resolved_reference_length();
coleenp@3656 147 if (map_length > 0) {
coleenp@3656 148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
coleenp@3656 149 Handle refs_handle (THREAD, (oop)stom); // must handleize.
coleenp@3656 150
coleenp@3656 151 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
coleenp@3656 152 set_resolved_references(loader_data->add_handle(refs_handle));
coleenp@3656 153 }
coleenp@3656 154 }
coleenp@3656 155 }
coleenp@3656 156
coleenp@3656 157 void ConstantPool::remove_unshareable_info() {
coleenp@3656 158 // Resolved references are not in the shared archive.
coleenp@3656 159 // Save the length for restoration. It is not necessarily the same length
coleenp@3656 160 // as reference_map.length() if invokedynamic is saved.
coleenp@3656 161 set_resolved_reference_length(
coleenp@3656 162 resolved_references() != NULL ? resolved_references()->length() : 0);
coleenp@3656 163 set_resolved_references(NULL);
iklam@4645 164 }
iklam@4645 165
iklam@4645 166 oop ConstantPool::lock() {
iklam@4645 167 if (_pool_holder) {
iklam@4645 168 // We re-use the _pool_holder's init_lock to reduce footprint.
iklam@4645 169 // Notes on deadlocks:
iklam@4645 170 // [1] This lock is a Java oop, so it can be recursively locked by
iklam@4645 171 // the same thread without self-deadlocks.
iklam@4645 172 // [2] Deadlock will happen if there is circular dependency between
iklam@4645 173 // the <clinit> of two Java classes. However, in this case,
iklam@4645 174 // the deadlock would have happened long before we reach
iklam@4645 175 // ConstantPool::lock(), so reusing init_lock does not
iklam@4645 176 // increase the possibility of deadlock.
iklam@4645 177 return _pool_holder->init_lock();
iklam@4645 178 } else {
iklam@4645 179 return NULL;
iklam@4645 180 }
coleenp@3656 181 }
coleenp@3656 182
coleenp@3656 183 int ConstantPool::cp_to_object_index(int cp_index) {
coleenp@3656 184 // this is harder don't do this so much.
coleenp@5435 185 int i = reference_map()->find(cp_index);
coleenp@5435 186 // We might not find the index for jsr292 call.
coleenp@5435 187 return (i < 0) ? _no_index_sentinel : i;
coleenp@3656 188 }
coleenp@3656 189
coleenp@3656 190 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
coleenp@3656 191 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
duke@0 192 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
duke@0 193 // tag is not updated atomicly.
coleenp@3656 194
coleenp@2069 195 CPSlot entry = this_oop->slot_at(which);
coleenp@3656 196 if (entry.is_resolved()) {
coleenp@3656 197 assert(entry.get_klass()->is_klass(), "must be");
duke@0 198 // Already resolved - return entry.
coleenp@3656 199 return entry.get_klass();
duke@0 200 }
duke@0 201
duke@0 202 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
duke@0 203 // already has updated the object
duke@0 204 assert(THREAD->is_Java_thread(), "must be a Java thread");
duke@0 205 bool do_resolve = false;
duke@0 206 bool in_error = false;
duke@0 207
coleenp@3656 208 // Create a handle for the mirror. This will preserve the resolved class
coleenp@3656 209 // until the loader_data is registered.
coleenp@3656 210 Handle mirror_handle;
coleenp@3656 211
coleenp@2069 212 Symbol* name = NULL;
duke@0 213 Handle loader;
iklam@4645 214 {
iklam@4645 215 oop cplock = this_oop->lock();
iklam@4645 216 ObjectLocker ol(cplock , THREAD, cplock != NULL);
duke@0 217
duke@0 218 if (this_oop->tag_at(which).is_unresolved_klass()) {
duke@0 219 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
duke@0 220 in_error = true;
duke@0 221 } else {
duke@0 222 do_resolve = true;
coleenp@2069 223 name = this_oop->unresolved_klass_at(which);
coleenp@3880 224 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
duke@0 225 }
duke@0 226 }
duke@0 227 } // unlocking constantPool
duke@0 228
duke@0 229
duke@0 230 // The original attempt to resolve this constant pool entry failed so find the
duke@0 231 // original error and throw it again (JVMS 5.4.3).
duke@0 232 if (in_error) {
coleenp@2069 233 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
coleenp@2069 234 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
duke@0 235 ResourceMark rm;
duke@0 236 // exception text will be the class name
duke@0 237 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
duke@0 238 THROW_MSG_0(error, className);
duke@0 239 }
duke@0 240
duke@0 241 if (do_resolve) {
duke@0 242 // this_oop must be unlocked during resolve_or_fail
coleenp@3880 243 oop protection_domain = this_oop->pool_holder()->protection_domain();
duke@0 244 Handle h_prot (THREAD, protection_domain);
coleenp@3656 245 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
duke@0 246 KlassHandle k;
duke@0 247 if (!HAS_PENDING_EXCEPTION) {
duke@0 248 k = KlassHandle(THREAD, k_oop);
coleenp@3656 249 // preserve the resolved klass.
coleenp@3656 250 mirror_handle = Handle(THREAD, k_oop->java_mirror());
duke@0 251 // Do access check for klasses
duke@0 252 verify_constant_pool_resolve(this_oop, k, THREAD);
duke@0 253 }
duke@0 254
duke@0 255 // Failed to resolve class. We must record the errors so that subsequent attempts
duke@0 256 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
duke@0 257 if (HAS_PENDING_EXCEPTION) {
duke@0 258 ResourceMark rm;
coleenp@3656 259 Symbol* error = PENDING_EXCEPTION->klass()->name();
duke@0 260
duke@0 261 bool throw_orig_error = false;
duke@0 262 {
iklam@4645 263 oop cplock = this_oop->lock();
iklam@4645 264 ObjectLocker ol(cplock, THREAD, cplock != NULL);
duke@0 265
duke@0 266 // some other thread has beaten us and has resolved the class.
duke@0 267 if (this_oop->tag_at(which).is_klass()) {
duke@0 268 CLEAR_PENDING_EXCEPTION;
duke@0 269 entry = this_oop->resolved_klass_at(which);
coleenp@3656 270 return entry.get_klass();
duke@0 271 }
duke@0 272
duke@0 273 if (!PENDING_EXCEPTION->
never@1142 274 is_a(SystemDictionary::LinkageError_klass())) {
duke@0 275 // Just throw the exception and don't prevent these classes from
duke@0 276 // being loaded due to virtual machine errors like StackOverflow
duke@0 277 // and OutOfMemoryError, etc, or if the thread was hit by stop()
duke@0 278 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
duke@0 279 }
duke@0 280 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
duke@0 281 SystemDictionary::add_resolution_error(this_oop, which, error);
duke@0 282 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
duke@0 283 } else {
duke@0 284 // some other thread has put the class in error state.
coleenp@2069 285 error = SystemDictionary::find_resolution_error(this_oop, which);
coleenp@2069 286 assert(error != NULL, "checking");
duke@0 287 throw_orig_error = true;
duke@0 288 }
duke@0 289 } // unlocked
duke@0 290
duke@0 291 if (throw_orig_error) {
duke@0 292 CLEAR_PENDING_EXCEPTION;
duke@0 293 ResourceMark rm;
duke@0 294 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
duke@0 295 THROW_MSG_0(error, className);
duke@0 296 }
duke@0 297
duke@0 298 return 0;
duke@0 299 }
duke@0 300
coleenp@3656 301 if (TraceClassResolution && !k()->oop_is_array()) {
duke@0 302 // skip resolving the constant pool so that this code get's
duke@0 303 // called the next time some bytecodes refer to this class.
duke@0 304 ResourceMark rm;
duke@0 305 int line_number = -1;
duke@0 306 const char * source_file = NULL;
duke@0 307 if (JavaThread::current()->has_last_Java_frame()) {
duke@0 308 // try to identify the method which called this function.
duke@0 309 vframeStream vfst(JavaThread::current());
duke@0 310 if (!vfst.at_end()) {
duke@0 311 line_number = vfst.method()->line_number_from_bci(vfst.bci());
coleenp@3880 312 Symbol* s = vfst.method()->method_holder()->source_file_name();
duke@0 313 if (s != NULL) {
duke@0 314 source_file = s->as_C_string();
duke@0 315 }
duke@0 316 }
duke@0 317 }
duke@0 318 if (k() != this_oop->pool_holder()) {
duke@0 319 // only print something if the classes are different
duke@0 320 if (source_file != NULL) {
duke@0 321 tty->print("RESOLVE %s %s %s:%d\n",
coleenp@3880 322 this_oop->pool_holder()->external_name(),
coleenp@3656 323 InstanceKlass::cast(k())->external_name(), source_file, line_number);
duke@0 324 } else {
duke@0 325 tty->print("RESOLVE %s %s\n",
coleenp@3880 326 this_oop->pool_holder()->external_name(),
coleenp@3656 327 InstanceKlass::cast(k())->external_name());
duke@0 328 }
duke@0 329 }
duke@0 330 return k();
duke@0 331 } else {
iklam@4645 332 oop cplock = this_oop->lock();
iklam@4645 333 ObjectLocker ol(cplock, THREAD, cplock != NULL);
duke@0 334 // Only updated constant pool - if it is resolved.
duke@0 335 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
duke@0 336 if (do_resolve) {
coleenp@3880 337 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
coleenp@3936 338 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
duke@0 339 this_oop->klass_at_put(which, k());
duke@0 340 }
duke@0 341 }
duke@0 342 }
duke@0 343
duke@0 344 entry = this_oop->resolved_klass_at(which);
coleenp@3656 345 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
coleenp@3656 346 return entry.get_klass();
duke@0 347 }
duke@0 348
duke@0 349
coleenp@3656 350 // Does not update ConstantPool* - to avoid any exception throwing. Used
duke@0 351 // by compiler and exception handling. Also used to avoid classloads for
duke@0 352 // instanceof operations. Returns NULL if the class has not been loaded or
duke@0 353 // if the verification of constant pool failed
coleenp@3656 354 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
coleenp@2069 355 CPSlot entry = this_oop->slot_at(which);
coleenp@3656 356 if (entry.is_resolved()) {
coleenp@3656 357 assert(entry.get_klass()->is_klass(), "must be");
coleenp@3656 358 return entry.get_klass();
duke@0 359 } else {
coleenp@3656 360 assert(entry.is_unresolved(), "must be either symbol or klass");
duke@0 361 Thread *thread = Thread::current();
coleenp@2069 362 Symbol* name = entry.get_symbol();
coleenp@3880 363 oop loader = this_oop->pool_holder()->class_loader();
coleenp@3880 364 oop protection_domain = this_oop->pool_holder()->protection_domain();
duke@0 365 Handle h_prot (thread, protection_domain);
duke@0 366 Handle h_loader (thread, loader);
coleenp@3656 367 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
duke@0 368
duke@0 369 if (k != NULL) {
duke@0 370 // Make sure that resolving is legal
duke@0 371 EXCEPTION_MARK;
duke@0 372 KlassHandle klass(THREAD, k);
duke@0 373 // return NULL if verification fails
duke@0 374 verify_constant_pool_resolve(this_oop, klass, THREAD);
duke@0 375 if (HAS_PENDING_EXCEPTION) {
duke@0 376 CLEAR_PENDING_EXCEPTION;
duke@0 377 return NULL;
duke@0 378 }
duke@0 379 return klass();
duke@0 380 } else {
duke@0 381 return k;
duke@0 382 }
duke@0 383 }
duke@0 384 }
duke@0 385
duke@0 386
coleenp@3656 387 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
duke@0 388 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
duke@0 389 }
duke@0 390
duke@0 391
duke@0 392 // This is an interface for the compiler that allows accessing non-resolved entries
duke@0 393 // in the constant pool - but still performs the validations tests. Must be used
duke@0 394 // in a pre-parse of the compiler - to determine what it can do and not do.
duke@0 395 // Note: We cannot update the ConstantPool from the vm_thread.
coleenp@3656 396 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
duke@0 397 int which = this_oop->klass_ref_index_at(index);
coleenp@2069 398 CPSlot entry = this_oop->slot_at(which);
coleenp@3656 399 if (entry.is_resolved()) {
coleenp@3656 400 assert(entry.get_klass()->is_klass(), "must be");
coleenp@3656 401 return entry.get_klass();
duke@0 402 } else {
coleenp@3656 403 assert(entry.is_unresolved(), "must be either symbol or klass");
coleenp@2069 404 Symbol* name = entry.get_symbol();
coleenp@3880 405 oop loader = this_oop->pool_holder()->class_loader();
coleenp@3880 406 oop protection_domain = this_oop->pool_holder()->protection_domain();
duke@0 407 Handle h_loader(THREAD, loader);
duke@0 408 Handle h_prot (THREAD, protection_domain);
duke@0 409 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
duke@0 410
duke@0 411 // Do access check for klasses
duke@0 412 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
duke@0 413 return k();
duke@0 414 }
duke@0 415 }
duke@0 416
duke@0 417
coleenp@3656 418 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
twisti@3582 419 int which) {
brutisso@3067 420 if (cpool->cache() == NULL) return NULL; // nothing to load yet
coleenp@3656 421 int cache_index = decode_cpcache_index(which, true);
jrose@2557 422 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
coleenp@3656 423 // FIXME: should be an assert
jrose@2557 424 if (PrintMiscellaneous && (Verbose||WizardMode)) {
twisti@3582 425 tty->print_cr("bad operand %d in:", which); cpool->print();
jrose@2557 426 }
jrose@2557 427 return NULL;
jrose@2557 428 }
jrose@2557 429 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
twisti@3582 430 return e->method_if_resolved(cpool);
twisti@3582 431 }
twisti@3582 432
twisti@3582 433
coleenp@3656 434 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
twisti@3582 435 if (cpool->cache() == NULL) return false; // nothing to load yet
coleenp@3656 436 int cache_index = decode_cpcache_index(which, true);
coleenp@3656 437 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
twisti@3582 438 return e->has_appendix();
twisti@3582 439 }
twisti@3582 440
coleenp@3656 441 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
twisti@3582 442 if (cpool->cache() == NULL) return NULL; // nothing to load yet
coleenp@3656 443 int cache_index = decode_cpcache_index(which, true);
coleenp@3656 444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
coleenp@3656 445 return e->appendix_if_resolved(cpool);
jrose@2557 446 }
jrose@2557 447
jrose@2557 448
twisti@3753 449 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
twisti@3753 450 if (cpool->cache() == NULL) return false; // nothing to load yet
twisti@3753 451 int cache_index = decode_cpcache_index(which, true);
twisti@3753 452 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
twisti@3753 453 return e->has_method_type();
twisti@3753 454 }
twisti@3753 455
twisti@3753 456 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
twisti@3753 457 if (cpool->cache() == NULL) return NULL; // nothing to load yet
twisti@3753 458 int cache_index = decode_cpcache_index(which, true);
twisti@3753 459 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
twisti@3753 460 return e->method_type_if_resolved(cpool);
twisti@3753 461 }
twisti@3753 462
twisti@3753 463
coleenp@3656 464 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
jrose@726 465 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
duke@0 466 return symbol_at(name_index);
duke@0 467 }
duke@0 468
duke@0 469
coleenp@3656 470 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
jrose@726 471 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
duke@0 472 return symbol_at(signature_index);
duke@0 473 }
duke@0 474
duke@0 475
coleenp@3656 476 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
jrose@1059 477 int i = which;
jrose@1059 478 if (!uncached && cache() != NULL) {
coleenp@3656 479 if (ConstantPool::is_invokedynamic_index(which)) {
coleenp@3656 480 // Invokedynamic index is index into resolved_references
coleenp@3656 481 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
jrose@2316 482 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
jrose@1583 483 assert(tag_at(pool_index).is_name_and_type(), "");
jrose@1583 484 return pool_index;
jrose@1583 485 }
jrose@1059 486 // change byte-ordering and go via cache
jrose@1059 487 i = remap_instruction_operand_from_cache(which);
jrose@1059 488 } else {
jrose@1838 489 if (tag_at(which).is_invoke_dynamic()) {
jrose@1838 490 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
jrose@1838 491 assert(tag_at(pool_index).is_name_and_type(), "");
jrose@1838 492 return pool_index;
jrose@1838 493 }
jrose@1059 494 }
jrose@1059 495 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
jrose@1838 496 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
jrose@1059 497 jint ref_index = *int_at_addr(i);
duke@0 498 return extract_high_short_from_int(ref_index);
duke@0 499 }
duke@0 500
duke@0 501
coleenp@3656 502 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
coleenp@3656 503 guarantee(!ConstantPool::is_invokedynamic_index(which),
jrose@1059 504 "an invokedynamic instruction does not have a klass");
jrose@1059 505 int i = which;
jrose@1059 506 if (!uncached && cache() != NULL) {
jrose@1059 507 // change byte-ordering and go via cache
jrose@1059 508 i = remap_instruction_operand_from_cache(which);
jrose@1059 509 }
jrose@1059 510 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
jrose@1059 511 jint ref_index = *int_at_addr(i);
duke@0 512 return extract_low_short_from_int(ref_index);
duke@0 513 }
duke@0 514
duke@0 515
jrose@726 516
coleenp@3656 517 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
jrose@1486 518 int cpc_index = operand;
jrose@1486 519 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
jrose@1486 520 assert((int)(u2)cpc_index == cpc_index, "clean u2");
jrose@1059 521 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
jrose@1059 522 return member_index;
jrose@726 523 }
jrose@726 524
jrose@726 525
coleenp@3656 526 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
duke@0 527 if (k->oop_is_instance() || k->oop_is_objArray()) {
duke@0 528 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
coleenp@3764 529 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
duke@0 530 KlassHandle element (THREAD, elem_oop);
duke@0 531
duke@0 532 // The element type could be a typeArray - we only need the access check if it is
duke@0 533 // an reference to another class
duke@0 534 if (element->oop_is_instance()) {
duke@0 535 LinkResolver::check_klass_accessability(holder, element, CHECK);
duke@0 536 }
duke@0 537 }
duke@0 538 }
duke@0 539
duke@0 540
coleenp@3656 541 int ConstantPool::name_ref_index_at(int which_nt) {
jrose@726 542 jint ref_index = name_and_type_at(which_nt);
duke@0 543 return extract_low_short_from_int(ref_index);
duke@0 544 }
duke@0 545
duke@0 546
coleenp@3656 547 int ConstantPool::signature_ref_index_at(int which_nt) {
jrose@726 548 jint ref_index = name_and_type_at(which_nt);
duke@0 549 return extract_high_short_from_int(ref_index);
duke@0 550 }
duke@0 551
duke@0 552
coleenp@3656 553 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
duke@0 554 return klass_at(klass_ref_index_at(which), CHECK_NULL);
duke@0 555 }
duke@0 556
duke@0 557
coleenp@3656 558 Symbol* ConstantPool::klass_name_at(int which) {
duke@0 559 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
duke@0 560 "Corrupted constant pool");
coleenp@3656 561 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
duke@0 562 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
duke@0 563 // tag is not updated atomicly.
coleenp@2069 564 CPSlot entry = slot_at(which);
coleenp@3656 565 if (entry.is_resolved()) {
duke@0 566 // Already resolved - return entry's name.
coleenp@3656 567 assert(entry.get_klass()->is_klass(), "must be");
coleenp@3656 568 return entry.get_klass()->name();
duke@0 569 } else {
coleenp@3656 570 assert(entry.is_unresolved(), "must be either symbol or klass");
coleenp@2069 571 return entry.get_symbol();
duke@0 572 }
duke@0 573 }
duke@0 574
coleenp@3656 575 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
duke@0 576 jint ref_index = klass_ref_index_at(which);
duke@0 577 return klass_at_noresolve(ref_index);
duke@0 578 }
duke@0 579
coleenp@3656 580 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
jrose@1524 581 jint ref_index = uncached_klass_ref_index_at(which);
jrose@1524 582 return klass_at_noresolve(ref_index);
jrose@1524 583 }
jrose@1524 584
coleenp@3656 585 char* ConstantPool::string_at_noresolve(int which) {
coleenp@3656 586 Symbol* s = unresolved_string_at(which);
coleenp@3656 587 if (s == NULL) {
coleenp@3656 588 return (char*)"<pseudo-string>";
duke@0 589 } else {
coleenp@3656 590 return unresolved_string_at(which)->as_C_string();
duke@0 591 }
duke@0 592 }
duke@0 593
coleenp@3656 594 BasicType ConstantPool::basic_type_for_signature_at(int which) {
duke@0 595 return FieldType::basic_type(symbol_at(which));
duke@0 596 }
duke@0 597
duke@0 598
coleenp@3656 599 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
duke@0 600 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
coleenp@3656 601 if (this_oop->tag_at(index).is_string()) {
duke@0 602 this_oop->string_at(index, CHECK);
duke@0 603 }
duke@0 604 }
duke@0 605 }
duke@0 606
coleenp@3656 607 // Resolve all the classes in the constant pool. If they are all resolved,
coleenp@3656 608 // the constant pool is read-only. Enhancement: allocate cp entries to
coleenp@3656 609 // another metaspace, and copy to read-only or read-write space if this
coleenp@3656 610 // bit is set.
coleenp@3656 611 bool ConstantPool::resolve_class_constants(TRAPS) {
coleenp@3656 612 constantPoolHandle cp(THREAD, this);
coleenp@3656 613 for (int index = 1; index < length(); index++) { // Index 0 is unused
coleenp@3656 614 if (tag_at(index).is_unresolved_klass() &&
coleenp@3656 615 klass_at_if_loaded(cp, index) == NULL) {
coleenp@3656 616 return false;
jrose@1838 617 }
coleenp@3656 618 }
coleenp@3656 619 // set_preresolution(); or some bit for future use
coleenp@3656 620 return true;
jrose@1838 621 }
jrose@1838 622
coleenp@3656 623 // If resolution for MethodHandle or MethodType fails, save the exception
coleenp@3656 624 // in the resolution error table, so that the same exception is thrown again.
coleenp@3656 625 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
coleenp@3656 626 int tag, TRAPS) {
coleenp@3656 627 ResourceMark rm;
coleenp@3656 628 Symbol* error = PENDING_EXCEPTION->klass()->name();
iklam@4645 629 oop cplock = this_oop->lock();
iklam@4645 630 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag.
coleenp@3656 631
coleenp@3656 632 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
coleenp@3656 633 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
coleenp@3656 634
coleenp@3656 635 if (!PENDING_EXCEPTION->
coleenp@3656 636 is_a(SystemDictionary::LinkageError_klass())) {
coleenp@3656 637 // Just throw the exception and don't prevent these classes from
coleenp@3656 638 // being loaded due to virtual machine errors like StackOverflow
coleenp@3656 639 // and OutOfMemoryError, etc, or if the thread was hit by stop()
coleenp@3656 640 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
coleenp@3656 641
coleenp@3656 642 } else if (this_oop->tag_at(which).value() != error_tag) {
coleenp@3656 643 SystemDictionary::add_resolution_error(this_oop, which, error);
coleenp@3656 644 this_oop->tag_at_put(which, error_tag);
coleenp@3656 645 } else {
coleenp@3656 646 // some other thread has put the class in error state.
coleenp@3656 647 error = SystemDictionary::find_resolution_error(this_oop, which);
coleenp@3656 648 assert(error != NULL, "checking");
coleenp@3656 649 CLEAR_PENDING_EXCEPTION;
coleenp@3656 650 THROW_MSG(error, "");
coleenp@3656 651 }
coleenp@3656 652 }
coleenp@3656 653
coleenp@3656 654
coleenp@3656 655 // Called to resolve constants in the constant pool and return an oop.
coleenp@3656 656 // Some constant pool entries cache their resolved oop. This is also
coleenp@3656 657 // called to create oops from constants to use in arguments for invokedynamic
coleenp@3656 658 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
jrose@1524 659 oop result_oop = NULL;
jrose@1838 660 Handle throw_exception;
jrose@1838 661
jrose@1838 662 if (cache_index == _possible_index_sentinel) {
coleenp@3656 663 // It is possible that this constant is one which is cached in the objects.
jrose@1838 664 // We'll do a linear search. This should be OK because this usage is rare.
jrose@1838 665 assert(index > 0, "valid index");
coleenp@3656 666 cache_index = this_oop->cp_to_object_index(index);
jrose@1838 667 }
jrose@1838 668 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
jrose@1838 669 assert(index == _no_index_sentinel || index >= 0, "");
jrose@1838 670
jrose@1524 671 if (cache_index >= 0) {
coleenp@3656 672 result_oop = this_oop->resolved_references()->obj_at(cache_index);
jrose@1524 673 if (result_oop != NULL) {
coleenp@3656 674 return result_oop;
jrose@1838 675 // That was easy...
jrose@1524 676 }
coleenp@3656 677 index = this_oop->object_to_cp_index(cache_index);
jrose@1524 678 }
jrose@1524 679
jrose@1838 680 jvalue prim_value; // temp used only in a few cases below
jrose@1838 681
jrose@1524 682 int tag_value = this_oop->tag_at(index).value();
coleenp@3656 683
jrose@1524 684 switch (tag_value) {
jrose@1524 685
jrose@1524 686 case JVM_CONSTANT_UnresolvedClass:
jrose@1524 687 case JVM_CONSTANT_UnresolvedClassInError:
jrose@1524 688 case JVM_CONSTANT_Class:
jrose@1524 689 {
coleenp@3656 690 assert(cache_index == _no_index_sentinel, "should not have been set");
coleenp@3656 691 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
jrose@1524 692 // ldc wants the java mirror.
never@2231 693 result_oop = resolved->java_mirror();
jrose@1524 694 break;
jrose@1524 695 }
jrose@1524 696
jrose@1524 697 case JVM_CONSTANT_String:
coleenp@3656 698 assert(cache_index != _no_index_sentinel, "should have been set");
jrose@1524 699 if (this_oop->is_pseudo_string_at(index)) {
coleenp@3656 700 result_oop = this_oop->pseudo_string_at(index, cache_index);
jrose@1524 701 break;
jrose@1524 702 }
coleenp@3656 703 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
jrose@1524 704 break;
jrose@1524 705
coleenp@3656 706 case JVM_CONSTANT_MethodHandleInError:
coleenp@3656 707 case JVM_CONSTANT_MethodTypeInError:
coleenp@3656 708 {
coleenp@3656 709 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
coleenp@3656 710 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
coleenp@3656 711 ResourceMark rm;
coleenp@3656 712 THROW_MSG_0(error, "");
coleenp@3656 713 break;
coleenp@3656 714 }
coleenp@3656 715
jrose@1524 716 case JVM_CONSTANT_MethodHandle:
jrose@1524 717 {
jrose@1524 718 int ref_kind = this_oop->method_handle_ref_kind_at(index);
jrose@1524 719 int callee_index = this_oop->method_handle_klass_index_at(index);
coleenp@2069 720 Symbol* name = this_oop->method_handle_name_ref_at(index);
coleenp@2069 721 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
jrose@1524 722 if (PrintMiscellaneous)
jrose@1524 723 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
jrose@1524 724 ref_kind, index, this_oop->method_handle_index_at(index),
jrose@1524 725 callee_index, name->as_C_string(), signature->as_C_string());
jrose@1524 726 KlassHandle callee;
coleenp@3656 727 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
jrose@1524 728 callee = KlassHandle(THREAD, k);
jrose@1524 729 }
jrose@1524 730 KlassHandle klass(THREAD, this_oop->pool_holder());
jrose@1524 731 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
jrose@1524 732 callee, name, signature,
jrose@1838 733 THREAD);
coleenp@3656 734 result_oop = value();
jrose@1838 735 if (HAS_PENDING_EXCEPTION) {
coleenp@3656 736 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
jrose@1838 737 }
jrose@1524 738 break;
jrose@1524 739 }
jrose@1524 740
jrose@1524 741 case JVM_CONSTANT_MethodType:
jrose@1524 742 {
coleenp@2069 743 Symbol* signature = this_oop->method_type_signature_at(index);
jrose@1524 744 if (PrintMiscellaneous)
jrose@1524 745 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
jrose@1524 746 index, this_oop->method_type_index_at(index),
jrose@1524 747 signature->as_C_string());
jrose@1524 748 KlassHandle klass(THREAD, this_oop->pool_holder());
twisti@3582 749 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
coleenp@3656 750 result_oop = value();
jrose@1838 751 if (HAS_PENDING_EXCEPTION) {
coleenp@3656 752 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
jrose@1838 753 }
jrose@1524 754 break;
jrose@1524 755 }
jrose@1524 756
jrose@1524 757 case JVM_CONSTANT_Integer:
coleenp@3656 758 assert(cache_index == _no_index_sentinel, "should not have been set");
jrose@1838 759 prim_value.i = this_oop->int_at(index);
jrose@1838 760 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
jrose@1838 761 break;
jrose@1838 762
jrose@1524 763 case JVM_CONSTANT_Float:
coleenp@3656 764 assert(cache_index == _no_index_sentinel, "should not have been set");
jrose@1838 765 prim_value.f = this_oop->float_at(index);
jrose@1838 766 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
jrose@1838 767 break;
jrose@1838 768
jrose@1524 769 case JVM_CONSTANT_Long:
coleenp@3656 770 assert(cache_index == _no_index_sentinel, "should not have been set");
jrose@1838 771 prim_value.j = this_oop->long_at(index);
jrose@1838 772 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
jrose@1838 773 break;
jrose@1838 774
jrose@1524 775 case JVM_CONSTANT_Double:
coleenp@3656 776 assert(cache_index == _no_index_sentinel, "should not have been set");
jrose@1838 777 prim_value.d = this_oop->double_at(index);
jrose@1838 778 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
jrose@1524 779 break;
jrose@1524 780
jrose@1524 781 default:
jrose@1524 782 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
jrose@1524 783 this_oop(), index, cache_index, tag_value) );
jrose@1524 784 assert(false, "unexpected constant tag");
jrose@1524 785 break;
jrose@1524 786 }
jrose@1524 787
jrose@1524 788 if (cache_index >= 0) {
jrose@1524 789 // Cache the oop here also.
jrose@1838 790 Handle result_handle(THREAD, result_oop);
iklam@4645 791 oop cplock = this_oop->lock();
iklam@4645 792 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this
coleenp@3656 793 oop result = this_oop->resolved_references()->obj_at(cache_index);
coleenp@3656 794 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
jrose@1838 795 // The important thing here is that all threads pick up the same result.
jrose@1838 796 // It doesn't matter which racing thread wins, as long as only one
jrose@1838 797 // result is used by all threads, and all future queries.
jrose@1838 798 // That result may be either a resolved constant or a failure exception.
coleenp@3656 799 if (result == NULL) {
coleenp@3656 800 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
coleenp@3656 801 return result_handle();
coleenp@3656 802 } else {
coleenp@3656 803 // Return the winning thread's result. This can be different than
coleenp@3656 804 // result_handle() for MethodHandles.
coleenp@3656 805 return result;
jrose@1524 806 }
jrose@1524 807 } else {
jrose@1524 808 return result_oop;
jrose@1524 809 }
jrose@1524 810 }
jrose@1524 811
coleenp@3656 812 oop ConstantPool::uncached_string_at(int which, TRAPS) {
coleenp@3656 813 Symbol* sym = unresolved_string_at(which);
coleenp@3656 814 oop str = StringTable::intern(sym, CHECK_(NULL));
coleenp@3656 815 assert(java_lang_String::is_instance(str), "must be string");
coleenp@3656 816 return str;
coleenp@3656 817 }
twisti@3582 818
coleenp@3656 819
coleenp@3656 820 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
twisti@3582 821 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
twisti@3582 822
twisti@3582 823 Handle bsm;
twisti@3582 824 int argc;
twisti@3582 825 {
twisti@3582 826 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
twisti@3582 827 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
twisti@3582 828 // It is accompanied by the optional arguments.
twisti@3582 829 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
twisti@3582 830 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
twisti@3582 831 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
twisti@3582 832 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
twisti@3582 833 }
twisti@3582 834
twisti@3582 835 // Extract the optional static arguments.
twisti@3582 836 argc = this_oop->invoke_dynamic_argument_count_at(index);
twisti@3582 837 if (argc == 0) return bsm_oop;
twisti@3582 838
twisti@3582 839 bsm = Handle(THREAD, bsm_oop);
twisti@3582 840 }
twisti@3582 841
twisti@3582 842 objArrayHandle info;
twisti@3582 843 {
twisti@3582 844 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
twisti@3582 845 info = objArrayHandle(THREAD, info_oop);
twisti@3582 846 }
twisti@3582 847
twisti@3582 848 info->obj_at_put(0, bsm());
twisti@3582 849 for (int i = 0; i < argc; i++) {
twisti@3582 850 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
twisti@3582 851 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
twisti@3582 852 info->obj_at_put(1+i, arg_oop);
twisti@3582 853 }
twisti@3582 854
twisti@3582 855 return info();
twisti@3582 856 }
twisti@3582 857
coleenp@3656 858 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
coleenp@3656 859 // If the string has already been interned, this entry will be non-null
coleenp@3656 860 oop str = this_oop->resolved_references()->obj_at(obj_index);
coleenp@3656 861 if (str != NULL) return str;
coleenp@5435 862 Symbol* sym = this_oop->unresolved_string_at(which);
coleenp@3656 863 str = StringTable::intern(sym, CHECK_(NULL));
coleenp@3656 864 this_oop->string_at_put(which, obj_index, str);
coleenp@2069 865 assert(java_lang_String::is_instance(str), "must be string");
coleenp@2069 866 return str;
duke@0 867 }
duke@0 868
duke@0 869
coleenp@3656 870 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
duke@0 871 int which) {
coleenp@2069 872 // Names are interned, so we can compare Symbol*s directly
coleenp@2069 873 Symbol* cp_name = klass_name_at(which);
duke@0 874 return (cp_name == k->name());
duke@0 875 }
duke@0 876
duke@0 877
coleenp@2069 878 // Iterate over symbols and decrement ones which are Symbol*s.
coleenp@2069 879 // This is done during GC so do not need to lock constantPool unless we
coleenp@2069 880 // have per-thread safepoints.
coleenp@2069 881 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
coleenp@2069 882 // these symbols but didn't increment the reference count.
coleenp@3656 883 void ConstantPool::unreference_symbols() {
coleenp@2069 884 for (int index = 1; index < length(); index++) { // Index 0 is unused
coleenp@2069 885 constantTag tag = tag_at(index);
coleenp@2069 886 if (tag.is_symbol()) {
coleenp@2069 887 symbol_at(index)->decrement_refcount();
coleenp@2069 888 }
coleenp@2069 889 }
coleenp@2069 890 }
duke@0 891
duke@0 892
duke@0 893 // Compare this constant pool's entry at index1 to the constant pool
duke@0 894 // cp2's entry at index2.
coleenp@3656 895 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
duke@0 896 int index2, TRAPS) {
duke@0 897
duke@0 898 jbyte t1 = tag_at(index1).value();
duke@0 899 jbyte t2 = cp2->tag_at(index2).value();
duke@0 900
duke@0 901
duke@0 902 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
duke@0 903 // when comparing
duke@0 904 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
duke@0 905 t1 = JVM_CONSTANT_UnresolvedClass;
duke@0 906 }
duke@0 907 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
duke@0 908 t2 = JVM_CONSTANT_UnresolvedClass;
duke@0 909 }
duke@0 910
duke@0 911 if (t1 != t2) {
duke@0 912 // Not the same entry type so there is nothing else to check. Note
duke@0 913 // that this style of checking will consider resolved/unresolved
coleenp@3656 914 // class pairs as different.
coleenp@3656 915 // From the ConstantPool* API point of view, this is correct
coleenp@3656 916 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
coleenp@3656 917 // plays out in the context of ConstantPool* merging.
duke@0 918 return false;
duke@0 919 }
duke@0 920
duke@0 921 switch (t1) {
duke@0 922 case JVM_CONSTANT_Class:
duke@0 923 {
coleenp@3656 924 Klass* k1 = klass_at(index1, CHECK_false);
coleenp@3656 925 Klass* k2 = cp2->klass_at(index2, CHECK_false);
duke@0 926 if (k1 == k2) {
duke@0 927 return true;
duke@0 928 }
duke@0 929 } break;
duke@0 930
duke@0 931 case JVM_CONSTANT_ClassIndex:
duke@0 932 {
duke@0 933 int recur1 = klass_index_at(index1);
duke@0 934 int recur2 = cp2->klass_index_at(index2);
duke@0 935 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 936 if (match) {
duke@0 937 return true;
duke@0 938 }
duke@0 939 } break;
duke@0 940
duke@0 941 case JVM_CONSTANT_Double:
duke@0 942 {
duke@0 943 jdouble d1 = double_at(index1);
duke@0 944 jdouble d2 = cp2->double_at(index2);
duke@0 945 if (d1 == d2) {
duke@0 946 return true;
duke@0 947 }
duke@0 948 } break;
duke@0 949
duke@0 950 case JVM_CONSTANT_Fieldref:
duke@0 951 case JVM_CONSTANT_InterfaceMethodref:
duke@0 952 case JVM_CONSTANT_Methodref:
duke@0 953 {
duke@0 954 int recur1 = uncached_klass_ref_index_at(index1);
duke@0 955 int recur2 = cp2->uncached_klass_ref_index_at(index2);
duke@0 956 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 957 if (match) {
duke@0 958 recur1 = uncached_name_and_type_ref_index_at(index1);
duke@0 959 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
duke@0 960 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 961 if (match) {
duke@0 962 return true;
duke@0 963 }
duke@0 964 }
duke@0 965 } break;
duke@0 966
duke@0 967 case JVM_CONSTANT_Float:
duke@0 968 {
duke@0 969 jfloat f1 = float_at(index1);
duke@0 970 jfloat f2 = cp2->float_at(index2);
duke@0 971 if (f1 == f2) {
duke@0 972 return true;
duke@0 973 }
duke@0 974 } break;
duke@0 975
duke@0 976 case JVM_CONSTANT_Integer:
duke@0 977 {
duke@0 978 jint i1 = int_at(index1);
duke@0 979 jint i2 = cp2->int_at(index2);
duke@0 980 if (i1 == i2) {
duke@0 981 return true;
duke@0 982 }
duke@0 983 } break;
duke@0 984
duke@0 985 case JVM_CONSTANT_Long:
duke@0 986 {
duke@0 987 jlong l1 = long_at(index1);
duke@0 988 jlong l2 = cp2->long_at(index2);
duke@0 989 if (l1 == l2) {
duke@0 990 return true;
duke@0 991 }
duke@0 992 } break;
duke@0 993
duke@0 994 case JVM_CONSTANT_NameAndType:
duke@0 995 {
duke@0 996 int recur1 = name_ref_index_at(index1);
duke@0 997 int recur2 = cp2->name_ref_index_at(index2);
duke@0 998 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 999 if (match) {
duke@0 1000 recur1 = signature_ref_index_at(index1);
duke@0 1001 recur2 = cp2->signature_ref_index_at(index2);
duke@0 1002 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 1003 if (match) {
duke@0 1004 return true;
duke@0 1005 }
duke@0 1006 }
duke@0 1007 } break;
duke@0 1008
duke@0 1009 case JVM_CONSTANT_StringIndex:
duke@0 1010 {
duke@0 1011 int recur1 = string_index_at(index1);
duke@0 1012 int recur2 = cp2->string_index_at(index2);
duke@0 1013 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@0 1014 if (match) {
duke@0 1015 return true;
duke@0 1016 }
duke@0 1017 } break;
duke@0 1018
duke@0 1019 case JVM_CONSTANT_UnresolvedClass:
duke@0 1020 {
coleenp@2069 1021 Symbol* k1 = unresolved_klass_at(index1);
coleenp@2069 1022 Symbol* k2 = cp2->unresolved_klass_at(index2);
duke@0 1023 if (k1 == k2) {
duke@0 1024 return true;
duke@0 1025 }
duke@0 1026 } break;
duke@0 1027
jrose@1524 1028 case JVM_CONSTANT_MethodType:
jrose@1524 1029 {
jrose@1524 1030 int k1 = method_type_index_at(index1);
jrose@1524 1031 int k2 = cp2->method_type_index_at(index2);
jrose@1924 1032 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
jrose@1924 1033 if (match) {
jrose@1524 1034 return true;
jrose@1524 1035 }
jrose@1524 1036 } break;
jrose@1524 1037
jrose@1524 1038 case JVM_CONSTANT_MethodHandle:
jrose@1524 1039 {
jrose@1524 1040 int k1 = method_handle_ref_kind_at(index1);
jrose@1524 1041 int k2 = cp2->method_handle_ref_kind_at(index2);
jrose@1524 1042 if (k1 == k2) {
jrose@1524 1043 int i1 = method_handle_index_at(index1);
jrose@1524 1044 int i2 = cp2->method_handle_index_at(index2);
jrose@1924 1045 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
jrose@1924 1046 if (match) {
jrose@1524 1047 return true;
jrose@1524 1048 }
jrose@1524 1049 }
jrose@1524 1050 } break;
jrose@1524 1051
jrose@1583 1052 case JVM_CONSTANT_InvokeDynamic:
jrose@1583 1053 {
sspitsyn@4644 1054 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
sspitsyn@4644 1055 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
sspitsyn@4644 1056 int i1 = invoke_dynamic_bootstrap_specifier_index(index1);
sspitsyn@4644 1057 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2);
ccheung@4848 1058 // separate statements and variables because CHECK_false is used
ccheung@4848 1059 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false);
ccheung@4848 1060 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false);
ccheung@4848 1061 return (match_entry && match_operand);
jrose@1583 1062 } break;
jrose@1583 1063
coleenp@3656 1064 case JVM_CONSTANT_String:
duke@0 1065 {
coleenp@2069 1066 Symbol* s1 = unresolved_string_at(index1);
coleenp@2069 1067 Symbol* s2 = cp2->unresolved_string_at(index2);
duke@0 1068 if (s1 == s2) {
duke@0 1069 return true;
duke@0 1070 }
duke@0 1071 } break;
duke@0 1072
duke@0 1073 case JVM_CONSTANT_Utf8:
duke@0 1074 {
coleenp@2069 1075 Symbol* s1 = symbol_at(index1);
coleenp@2069 1076 Symbol* s2 = cp2->symbol_at(index2);
duke@0 1077 if (s1 == s2) {
duke@0 1078 return true;
duke@0 1079 }
duke@0 1080 } break;
duke@0 1081
duke@0 1082 // Invalid is used as the tag for the second constant pool entry
duke@0 1083 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
duke@0 1084 // not be seen by itself.
duke@0 1085 case JVM_CONSTANT_Invalid: // fall through
duke@0 1086
duke@0 1087 default:
duke@0 1088 ShouldNotReachHere();
duke@0 1089 break;
duke@0 1090 }
duke@0 1091
duke@0 1092 return false;
duke@0 1093 } // end compare_entry_to()
duke@0 1094
duke@0 1095
sspitsyn@4644 1096 // Resize the operands array with delta_len and delta_size.
sspitsyn@4644 1097 // Used in RedefineClasses for CP merge.
sspitsyn@4644 1098 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) {
sspitsyn@4644 1099 int old_len = operand_array_length(operands());
sspitsyn@4644 1100 int new_len = old_len + delta_len;
sspitsyn@4644 1101 int min_len = (delta_len > 0) ? old_len : new_len;
sspitsyn@4644 1102
sspitsyn@4644 1103 int old_size = operands()->length();
sspitsyn@4644 1104 int new_size = old_size + delta_size;
sspitsyn@4644 1105 int min_size = (delta_size > 0) ? old_size : new_size;
sspitsyn@4644 1106
sspitsyn@4644 1107 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
sspitsyn@4644 1108 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK);
sspitsyn@4644 1109
sspitsyn@4644 1110 // Set index in the resized array for existing elements only
sspitsyn@4644 1111 for (int idx = 0; idx < min_len; idx++) {
sspitsyn@4644 1112 int offset = operand_offset_at(idx); // offset in original array
sspitsyn@4644 1113 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array
sspitsyn@4644 1114 }
sspitsyn@4644 1115 // Copy the bootstrap specifiers only
sspitsyn@4644 1116 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len),
sspitsyn@4644 1117 new_ops->adr_at(2*new_len),
sspitsyn@4644 1118 (min_size - 2*min_len) * sizeof(u2));
sspitsyn@4644 1119 // Explicitly deallocate old operands array.
sspitsyn@4644 1120 // Note, it is not needed for 7u backport.
sspitsyn@4644 1121 if ( operands() != NULL) { // the safety check
sspitsyn@4644 1122 MetadataFactory::free_array<u2>(loader_data, operands());
sspitsyn@4644 1123 }
sspitsyn@4644 1124 set_operands(new_ops);
sspitsyn@4644 1125 } // end resize_operands()
sspitsyn@4644 1126
sspitsyn@4644 1127
sspitsyn@4644 1128 // Extend the operands array with the length and size of the ext_cp operands.
sspitsyn@4644 1129 // Used in RedefineClasses for CP merge.
sspitsyn@4644 1130 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) {
sspitsyn@4644 1131 int delta_len = operand_array_length(ext_cp->operands());
sspitsyn@4644 1132 if (delta_len == 0) {
sspitsyn@4644 1133 return; // nothing to do
sspitsyn@4644 1134 }
sspitsyn@4644 1135 int delta_size = ext_cp->operands()->length();
sspitsyn@4644 1136
sspitsyn@4644 1137 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger");
sspitsyn@4644 1138
sspitsyn@4644 1139 if (operand_array_length(operands()) == 0) {
sspitsyn@4644 1140 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
sspitsyn@4644 1141 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK);
sspitsyn@4644 1142 // The first element index defines the offset of second part
sspitsyn@4644 1143 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array
sspitsyn@4644 1144 set_operands(new_ops);
sspitsyn@4644 1145 } else {
sspitsyn@4644 1146 resize_operands(delta_len, delta_size, CHECK);
sspitsyn@4644 1147 }
sspitsyn@4644 1148
sspitsyn@4644 1149 } // end extend_operands()
sspitsyn@4644 1150
sspitsyn@4644 1151
sspitsyn@4644 1152 // Shrink the operands array to a smaller array with new_len length.
sspitsyn@4644 1153 // Used in RedefineClasses for CP merge.
sspitsyn@4644 1154 void ConstantPool::shrink_operands(int new_len, TRAPS) {
sspitsyn@4644 1155 int old_len = operand_array_length(operands());
sspitsyn@4644 1156 if (new_len == old_len) {
sspitsyn@4644 1157 return; // nothing to do
sspitsyn@4644 1158 }
sspitsyn@4644 1159 assert(new_len < old_len, "shrunken operands array must be smaller");
sspitsyn@4644 1160
sspitsyn@4644 1161 int free_base = operand_next_offset_at(new_len - 1);
sspitsyn@4644 1162 int delta_len = new_len - old_len;
sspitsyn@4644 1163 int delta_size = 2*delta_len + free_base - operands()->length();
sspitsyn@4644 1164
sspitsyn@4644 1165 resize_operands(delta_len, delta_size, CHECK);
sspitsyn@4644 1166
sspitsyn@4644 1167 } // end shrink_operands()
sspitsyn@4644 1168
sspitsyn@4644 1169
sspitsyn@4135 1170 void ConstantPool::copy_operands(constantPoolHandle from_cp,
sspitsyn@4135 1171 constantPoolHandle to_cp,
sspitsyn@4135 1172 TRAPS) {
jrose@1924 1173
jrose@1924 1174 int from_oplen = operand_array_length(from_cp->operands());
jrose@1924 1175 int old_oplen = operand_array_length(to_cp->operands());
jrose@1924 1176 if (from_oplen != 0) {
kamg@3874 1177 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
jrose@1924 1178 // append my operands to the target's operands array
jrose@1924 1179 if (old_oplen == 0) {
kamg@3874 1180 // Can't just reuse from_cp's operand list because of deallocation issues
kamg@3874 1181 int len = from_cp->operands()->length();
kamg@3874 1182 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
kamg@3874 1183 Copy::conjoint_memory_atomic(
kamg@3874 1184 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
kamg@3874 1185 to_cp->set_operands(new_ops);
jrose@1924 1186 } else {
jrose@1924 1187 int old_len = to_cp->operands()->length();
jrose@1924 1188 int from_len = from_cp->operands()->length();
jrose@1924 1189 int old_off = old_oplen * sizeof(u2);
jrose@1924 1190 int from_off = from_oplen * sizeof(u2);
coleenp@3656 1191 // Use the metaspace for the destination constant pool
coleenp@3656 1192 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
jrose@1924 1193 int fillp = 0, len = 0;
jrose@1924 1194 // first part of dest
coleenp@3656 1195 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
coleenp@3656 1196 new_operands->adr_at(fillp),
jrose@1924 1197 (len = old_off) * sizeof(u2));
jrose@1924 1198 fillp += len;
jrose@1924 1199 // first part of src
sspitsyn@4147 1200 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
coleenp@3656 1201 new_operands->adr_at(fillp),
jrose@1924 1202 (len = from_off) * sizeof(u2));
jrose@1924 1203 fillp += len;
jrose@1924 1204 // second part of dest
coleenp@3656 1205 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
coleenp@3656 1206 new_operands->adr_at(fillp),
jrose@1924 1207 (len = old_len - old_off) * sizeof(u2));
jrose@1924 1208 fillp += len;
jrose@1924 1209 // second part of src
sspitsyn@4147 1210 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
coleenp@3656 1211 new_operands->adr_at(fillp),
jrose@1924 1212 (len = from_len - from_off) * sizeof(u2));
jrose@1924 1213 fillp += len;
jrose@1924 1214 assert(fillp == new_operands->length(), "");
jrose@1924 1215
jrose@1924 1216 // Adjust indexes in the first part of the copied operands array.
jrose@1924 1217 for (int j = 0; j < from_oplen; j++) {
coleenp@3656 1218 int offset = operand_offset_at(new_operands, old_oplen + j);
jrose@1924 1219 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
jrose@1924 1220 offset += old_len; // every new tuple is preceded by old_len extra u2's
coleenp@3656 1221 operand_offset_at_put(new_operands, old_oplen + j, offset);
jrose@1924 1222 }
jrose@1924 1223
jrose@1924 1224 // replace target operands array with combined array
coleenp@3656 1225 to_cp->set_operands(new_operands);
jrose@1924 1226 }
jrose@1924 1227 }
sspitsyn@4135 1228 } // end copy_operands()
jrose@1924 1229
sspitsyn@4135 1230
sspitsyn@4135 1231 // Copy this constant pool's entries at start_i to end_i (inclusive)
sspitsyn@4135 1232 // to the constant pool to_cp's entries starting at to_i. A total of
sspitsyn@4135 1233 // (end_i - start_i) + 1 entries are copied.
sspitsyn@4135 1234 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
sspitsyn@4135 1235 constantPoolHandle to_cp, int to_i, TRAPS) {
sspitsyn@4135 1236
sspitsyn@4135 1237
sspitsyn@4135 1238 int dest_i = to_i; // leave original alone for debug purposes
sspitsyn@4135 1239
sspitsyn@4135 1240 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
sspitsyn@4135 1241 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
sspitsyn@4135 1242
sspitsyn@4135 1243 switch (from_cp->tag_at(src_i).value()) {
sspitsyn@4135 1244 case JVM_CONSTANT_Double:
sspitsyn@4135 1245 case JVM_CONSTANT_Long:
sspitsyn@4135 1246 // double and long take two constant pool entries
sspitsyn@4135 1247 src_i += 2;
sspitsyn@4135 1248 dest_i += 2;
sspitsyn@4135 1249 break;
sspitsyn@4135 1250
sspitsyn@4135 1251 default:
sspitsyn@4135 1252 // all others take one constant pool entry
sspitsyn@4135 1253 src_i++;
sspitsyn@4135 1254 dest_i++;
sspitsyn@4135 1255 break;
sspitsyn@4135 1256 }
sspitsyn@4135 1257 }
sspitsyn@4135 1258 copy_operands(from_cp, to_cp, CHECK);
sspitsyn@4135 1259
sspitsyn@4135 1260 } // end copy_cp_to_impl()
duke@0 1261
duke@0 1262
duke@0 1263 // Copy this constant pool's entry at from_i to the constant pool
duke@0 1264 // to_cp's entry at to_i.
coleenp@3656 1265 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
jrose@1924 1266 constantPoolHandle to_cp, int to_i,
jrose@1924 1267 TRAPS) {
duke@0 1268
jrose@1924 1269 int tag = from_cp->tag_at(from_i).value();
jrose@1924 1270 switch (tag) {
duke@0 1271 case JVM_CONSTANT_Class:
duke@0 1272 {
coleenp@3656 1273 Klass* k = from_cp->klass_at(from_i, CHECK);
duke@0 1274 to_cp->klass_at_put(to_i, k);
duke@0 1275 } break;
duke@0 1276
duke@0 1277 case JVM_CONSTANT_ClassIndex:
duke@0 1278 {
jrose@1924 1279 jint ki = from_cp->klass_index_at(from_i);
duke@0 1280 to_cp->klass_index_at_put(to_i, ki);
duke@0 1281 } break;
duke@0 1282
duke@0 1283 case JVM_CONSTANT_Double:
duke@0 1284 {
jrose@1924 1285 jdouble d = from_cp->double_at(from_i);
duke@0 1286 to_cp->double_at_put(to_i, d);
duke@0 1287 // double takes two constant pool entries so init second entry's tag
duke@0 1288 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
duke@0 1289 } break;
duke@0 1290
duke@0 1291 case JVM_CONSTANT_Fieldref:
duke@0 1292 {
jrose@1924 1293 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
jrose@1924 1294 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
duke@0 1295 to_cp->field_at_put(to_i, class_index, name_and_type_index);
duke@0 1296 } break;
duke@0 1297
duke@0 1298 case JVM_CONSTANT_Float:
duke@0 1299 {
jrose@1924 1300 jfloat f = from_cp->float_at(from_i);
duke@0 1301 to_cp->float_at_put(to_i, f);
duke@0 1302 } break;
duke@0 1303
duke@0 1304 case JVM_CONSTANT_Integer:
duke@0 1305 {
jrose@1924 1306 jint i = from_cp->int_at(from_i);
duke@0 1307 to_cp->int_at_put(to_i, i);
duke@0 1308 } break;
duke@0 1309
duke@0 1310 case JVM_CONSTANT_InterfaceMethodref:
duke@0 1311 {
jrose@1924 1312 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
jrose@1924 1313 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
duke@0 1314 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
duke@0 1315 } break;
duke@0 1316
duke@0 1317 case JVM_CONSTANT_Long:
duke@0 1318 {
jrose@1924 1319 jlong l = from_cp->long_at(from_i);
duke@0 1320 to_cp->long_at_put(to_i, l);
duke@0 1321 // long takes two constant pool entries so init second entry's tag
duke@0 1322 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
duke@0 1323 } break;
duke@0 1324
duke@0 1325 case JVM_CONSTANT_Methodref:
duke@0 1326 {
jrose@1924 1327 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
jrose@1924 1328 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
duke@0 1329 to_cp->method_at_put(to_i, class_index, name_and_type_index);
duke@0 1330 } break;
duke@0 1331
duke@0 1332 case JVM_CONSTANT_NameAndType:
duke@0 1333 {
jrose@1924 1334 int name_ref_index = from_cp->name_ref_index_at(from_i);
jrose@1924 1335 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
duke@0 1336 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
duke@0 1337 } break;
duke@0 1338
duke@0 1339 case JVM_CONSTANT_StringIndex:
duke@0 1340 {
jrose@1924 1341 jint si = from_cp->string_index_at(from_i);
duke@0 1342 to_cp->string_index_at_put(to_i, si);
duke@0 1343 } break;
duke@0 1344
duke@0 1345 case JVM_CONSTANT_UnresolvedClass:
duke@0 1346 {
coleenp@2187 1347 // Can be resolved after checking tag, so check the slot first.
coleenp@2187 1348 CPSlot entry = from_cp->slot_at(from_i);
coleenp@3656 1349 if (entry.is_resolved()) {
coleenp@3656 1350 assert(entry.get_klass()->is_klass(), "must be");
coleenp@2187 1351 // Already resolved
coleenp@3656 1352 to_cp->klass_at_put(to_i, entry.get_klass());
coleenp@2187 1353 } else {
coleenp@2187 1354 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
coleenp@2187 1355 }
duke@0 1356 } break;
duke@0 1357
duke@0 1358 case JVM_CONSTANT_UnresolvedClassInError:
duke@0 1359 {
coleenp@2069 1360 Symbol* k = from_cp->unresolved_klass_at(from_i);
duke@0 1361 to_cp->unresolved_klass_at_put(to_i, k);
duke@0 1362 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
duke@0 1363 } break;
duke@0 1364
duke@0 1365
coleenp@3656 1366 case JVM_CONSTANT_String:
duke@0 1367 {
coleenp@3656 1368 Symbol* s = from_cp->unresolved_string_at(from_i);
coleenp@3656 1369 to_cp->unresolved_string_at_put(to_i, s);
duke@0 1370 } break;
duke@0 1371
duke@0 1372 case JVM_CONSTANT_Utf8:
duke@0 1373 {
coleenp@2069 1374 Symbol* s = from_cp->symbol_at(from_i);
coleenp@3656 1375 // Need to increase refcount, the old one will be thrown away and deferenced
coleenp@3656 1376 s->increment_refcount();
duke@0 1377 to_cp->symbol_at_put(to_i, s);
duke@0 1378 } break;
duke@0 1379
jrose@1524 1380 case JVM_CONSTANT_MethodType:
jrose@1524 1381 {
jrose@1924 1382 jint k = from_cp->method_type_index_at(from_i);
jrose@1524 1383 to_cp->method_type_index_at_put(to_i, k);
jrose@1524 1384 } break;
jrose@1524 1385
jrose@1524 1386 case JVM_CONSTANT_MethodHandle:
jrose@1524 1387 {
jrose@1924 1388 int k1 = from_cp->method_handle_ref_kind_at(from_i);
jrose@1924 1389 int k2 = from_cp->method_handle_index_at(from_i);
jrose@1524 1390 to_cp->method_handle_index_at_put(to_i, k1, k2);
jrose@1524 1391 } break;
jrose@1524 1392
jrose@1583 1393 case JVM_CONSTANT_InvokeDynamic:
jrose@1583 1394 {
jrose@1924 1395 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
jrose@1924 1396 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
jrose@1924 1397 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
jrose@1924 1398 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
jrose@1583 1399 } break;
jrose@1583 1400
duke@0 1401 // Invalid is used as the tag for the second constant pool entry
duke@0 1402 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
duke@0 1403 // not be seen by itself.
duke@0 1404 case JVM_CONSTANT_Invalid: // fall through
duke@0 1405
duke@0 1406 default:
duke@0 1407 {
duke@0 1408 ShouldNotReachHere();
duke@0 1409 } break;
duke@0 1410 }
duke@0 1411 } // end copy_entry_to()
duke@0 1412
duke@0 1413
duke@0 1414 // Search constant pool search_cp for an entry that matches this
duke@0 1415 // constant pool's entry at pattern_i. Returns the index of a
duke@0 1416 // matching entry or zero (0) if there is no matching entry.
coleenp@3656 1417 int ConstantPool::find_matching_entry(int pattern_i,
duke@0 1418 constantPoolHandle search_cp, TRAPS) {
duke@0 1419
duke@0 1420 // index zero (0) is not used
duke@0 1421 for (int i = 1; i < search_cp->length(); i++) {
duke@0 1422 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
duke@0 1423 if (found) {
duke@0 1424 return i;
duke@0 1425 }
duke@0 1426 }
duke@0 1427
duke@0 1428 return 0; // entry not found; return unused index zero (0)
duke@0 1429 } // end find_matching_entry()
duke@0 1430
duke@0 1431
sspitsyn@4644 1432 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool
sspitsyn@4644 1433 // cp2's bootstrap specifier at idx2.
sspitsyn@4644 1434 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) {
sspitsyn@4644 1435 int k1 = operand_bootstrap_method_ref_index_at(idx1);
sspitsyn@4644 1436 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2);
sspitsyn@4644 1437 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
sspitsyn@4644 1438
sspitsyn@4644 1439 if (!match) {
sspitsyn@4644 1440 return false;
sspitsyn@4644 1441 }
sspitsyn@4644 1442 int argc = operand_argument_count_at(idx1);
sspitsyn@4644 1443 if (argc == cp2->operand_argument_count_at(idx2)) {
sspitsyn@4644 1444 for (int j = 0; j < argc; j++) {
sspitsyn@4644 1445 k1 = operand_argument_index_at(idx1, j);
sspitsyn@4644 1446 k2 = cp2->operand_argument_index_at(idx2, j);
sspitsyn@4644 1447 match = compare_entry_to(k1, cp2, k2, CHECK_false);
sspitsyn@4644 1448 if (!match) {
sspitsyn@4644 1449 return false;
sspitsyn@4644 1450 }
sspitsyn@4644 1451 }
sspitsyn@4644 1452 return true; // got through loop; all elements equal
sspitsyn@4644 1453 }
sspitsyn@4644 1454 return false;
sspitsyn@4644 1455 } // end compare_operand_to()
sspitsyn@4644 1456
sspitsyn@4644 1457 // Search constant pool search_cp for a bootstrap specifier that matches
sspitsyn@4644 1458 // this constant pool's bootstrap specifier at pattern_i index.
sspitsyn@4644 1459 // Return the index of a matching bootstrap specifier or (-1) if there is no match.
sspitsyn@4644 1460 int ConstantPool::find_matching_operand(int pattern_i,
sspitsyn@4644 1461 constantPoolHandle search_cp, int search_len, TRAPS) {
sspitsyn@4644 1462 for (int i = 0; i < search_len; i++) {
sspitsyn@4644 1463 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1));
sspitsyn@4644 1464 if (found) {
sspitsyn@4644 1465 return i;
sspitsyn@4644 1466 }
sspitsyn@4644 1467 }
sspitsyn@4644 1468 return -1; // bootstrap specifier not found; return unused index (-1)
sspitsyn@4644 1469 } // end find_matching_operand()
sspitsyn@4644 1470
sspitsyn@4644 1471
duke@0 1472 #ifndef PRODUCT
duke@0 1473
coleenp@3656 1474 const char* ConstantPool::printable_name_at(int which) {
duke@0 1475
duke@0 1476 constantTag tag = tag_at(which);
duke@0 1477
coleenp@3656 1478 if (tag.is_string()) {
duke@0 1479 return string_at_noresolve(which);
duke@0 1480 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
duke@0 1481 return klass_name_at(which)->as_C_string();
duke@0 1482 } else if (tag.is_symbol()) {
duke@0 1483 return symbol_at(which)->as_C_string();
duke@0 1484 }
duke@0 1485 return "";
duke@0 1486 }
duke@0 1487
duke@0 1488 #endif // PRODUCT
duke@0 1489
duke@0 1490
duke@0 1491 // JVMTI GetConstantPool support
duke@0 1492
mikael@4540 1493 // For debugging of constant pool
mikael@4540 1494 const bool debug_cpool = false;
duke@0 1495
mikael@4540 1496 #define DBG(code) do { if (debug_cpool) { (code); } } while(0)
duke@0 1497
duke@0 1498 static void print_cpool_bytes(jint cnt, u1 *bytes) {
mikael@4540 1499 const char* WARN_MSG = "Must not be such entry!";
duke@0 1500 jint size = 0;
duke@0 1501 u2 idx1, idx2;
duke@0 1502
duke@0 1503 for (jint idx = 1; idx < cnt; idx++) {
duke@0 1504 jint ent_size = 0;
duke@0 1505 u1 tag = *bytes++;
duke@0 1506 size++; // count tag
duke@0 1507
duke@0 1508 printf("const #%03d, tag: %02d ", idx, tag);
duke@0 1509 switch(tag) {
duke@0 1510 case JVM_CONSTANT_Invalid: {
duke@0 1511 printf("Invalid");
duke@0 1512 break;
duke@0 1513 }
duke@0 1514 case JVM_CONSTANT_Unicode: {
duke@0 1515 printf("Unicode %s", WARN_MSG);
duke@0 1516 break;
duke@0 1517 }
duke@0 1518 case JVM_CONSTANT_Utf8: {
duke@0 1519 u2 len = Bytes::get_Java_u2(bytes);
duke@0 1520 char str[128];
duke@0 1521 if (len > 127) {
duke@0 1522 len = 127;
duke@0 1523 }
duke@0 1524 strncpy(str, (char *) (bytes+2), len);
duke@0 1525 str[len] = '\0';
duke@0 1526 printf("Utf8 \"%s\"", str);
duke@0 1527 ent_size = 2 + len;
duke@0 1528 break;
duke@0 1529 }
duke@0 1530 case JVM_CONSTANT_Integer: {
duke@0 1531 u4 val = Bytes::get_Java_u4(bytes);
duke@0 1532 printf("int %d", *(int *) &val);
duke@0 1533 ent_size = 4;
duke@0 1534 break;
duke@0 1535 }
duke@0 1536 case JVM_CONSTANT_Float: {
duke@0 1537 u4 val = Bytes::get_Java_u4(bytes);
duke@0 1538 printf("float %5.3ff", *(float *) &val);
duke@0 1539 ent_size = 4;
duke@0 1540 break;
duke@0 1541 }
duke@0 1542 case JVM_CONSTANT_Long: {
duke@0 1543 u8 val = Bytes::get_Java_u8(bytes);
never@2731 1544 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
duke@0 1545 ent_size = 8;
duke@0 1546 idx++; // Long takes two cpool slots
duke@0 1547 break;
duke@0 1548 }
duke@0 1549 case JVM_CONSTANT_Double: {
duke@0 1550 u8 val = Bytes::get_Java_u8(bytes);
duke@0 1551 printf("double %5.3fd", *(jdouble *)&val);
duke@0 1552 ent_size = 8;
duke@0 1553 idx++; // Double takes two cpool slots
duke@0 1554 break;
duke@0 1555 }
duke@0 1556 case JVM_CONSTANT_Class: {
duke@0 1557 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1558 printf("class #%03d", idx1);
duke@0 1559 ent_size = 2;
duke@0 1560 break;
duke@0 1561 }
duke@0 1562 case JVM_CONSTANT_String: {
duke@0 1563 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1564 printf("String #%03d", idx1);
duke@0 1565 ent_size = 2;
duke@0 1566 break;
duke@0 1567 }
duke@0 1568 case JVM_CONSTANT_Fieldref: {
duke@0 1569 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1570 idx2 = Bytes::get_Java_u2(bytes+2);
duke@0 1571 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
duke@0 1572 ent_size = 4;
duke@0 1573 break;
duke@0 1574 }
duke@0 1575 case JVM_CONSTANT_Methodref: {
duke@0 1576 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1577 idx2 = Bytes::get_Java_u2(bytes+2);
duke@0 1578 printf("Method #%03d, #%03d", idx1, idx2);
duke@0 1579 ent_size = 4;
duke@0 1580 break;
duke@0 1581 }
duke@0 1582 case JVM_CONSTANT_InterfaceMethodref: {
duke@0 1583 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1584 idx2 = Bytes::get_Java_u2(bytes+2);
duke@0 1585 printf("InterfMethod #%03d, #%03d", idx1, idx2);
duke@0 1586 ent_size = 4;
duke@0 1587 break;
duke@0 1588 }
duke@0 1589 case JVM_CONSTANT_NameAndType: {
duke@0 1590 idx1 = Bytes::get_Java_u2(bytes);
duke@0 1591 idx2 = Bytes::get_Java_u2(bytes+2);
duke@0 1592 printf("NameAndType #%03d, #%03d", idx1, idx2);
duke@0 1593 ent_size = 4;
duke@0 1594 break;
duke@0 1595 }
duke@0 1596 case JVM_CONSTANT_ClassIndex: {
duke@0 1597 printf("ClassIndex %s", WARN_MSG);
duke@0 1598 break;
duke@0 1599 }
duke@0 1600 case JVM_CONSTANT_UnresolvedClass: {
duke@0 1601 printf("UnresolvedClass: %s", WARN_MSG);
duke@0 1602 break;
duke@0 1603 }
duke@0 1604 case JVM_CONSTANT_UnresolvedClassInError: {
duke@0 1605 printf("UnresolvedClassInErr: %s", WARN_MSG);
duke@0 1606 break;
duke@0 1607 }
duke@0 1608 case JVM_CONSTANT_StringIndex: {
duke@0 1609 printf("StringIndex: %s", WARN_MSG);
duke@0 1610 break;
duke@0 1611 }
duke@0 1612 }
duke@0 1613 printf(";\n");
duke@0 1614 bytes += ent_size;
duke@0 1615 size += ent_size;
duke@0 1616 }
duke@0 1617 printf("Cpool size: %d\n", size);
duke@0 1618 fflush(0);
duke@0 1619 return;
duke@0 1620 } /* end print_cpool_bytes */
duke@0 1621
duke@0 1622
duke@0 1623 // Returns size of constant pool entry.
coleenp@3656 1624 jint ConstantPool::cpool_entry_size(jint idx) {
duke@0 1625 switch(tag_at(idx).value()) {
duke@0 1626 case JVM_CONSTANT_Invalid:
duke@0 1627 case JVM_CONSTANT_Unicode:
duke@0 1628 return 1;
duke@0 1629
duke@0 1630 case JVM_CONSTANT_Utf8:
duke@0 1631 return 3 + symbol_at(idx)->utf8_length();
duke@0 1632
duke@0 1633 case JVM_CONSTANT_Class:
duke@0 1634 case JVM_CONSTANT_String:
duke@0 1635 case JVM_CONSTANT_ClassIndex:
duke@0 1636 case JVM_CONSTANT_UnresolvedClass:
duke@0 1637 case JVM_CONSTANT_UnresolvedClassInError:
duke@0 1638 case JVM_CONSTANT_StringIndex:
jrose@1524 1639 case JVM_CONSTANT_MethodType:
duke@0 1640 return 3;
duke@0 1641
jrose@1524 1642 case JVM_CONSTANT_MethodHandle:
jrose@1524 1643 return 4; //tag, ref_kind, ref_index
jrose@1524 1644
duke@0 1645 case JVM_CONSTANT_Integer:
duke@0 1646 case JVM_CONSTANT_Float:
duke@0 1647 case JVM_CONSTANT_Fieldref:
duke@0 1648 case JVM_CONSTANT_Methodref:
duke@0 1649 case JVM_CONSTANT_InterfaceMethodref:
duke@0 1650 case JVM_CONSTANT_NameAndType:
jrose@1838 1651 return 5;
jrose@1838 1652
jrose@1583 1653 case JVM_CONSTANT_InvokeDynamic:
jrose@1924 1654 // u1 tag, u2 bsm, u2 nt
jrose@1924 1655 return 5;
duke@0 1656
duke@0 1657 case JVM_CONSTANT_Long:
duke@0 1658 case JVM_CONSTANT_Double:
duke@0 1659 return 9;
duke@0 1660 }
duke@0 1661 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
duke@0 1662 return 1;
duke@0 1663 } /* end cpool_entry_size */
duke@0 1664
duke@0 1665
duke@0 1666 // SymbolHashMap is used to find a constant pool index from a string.
duke@0 1667 // This function fills in SymbolHashMaps, one for utf8s and one for
duke@0 1668 // class names, returns size of the cpool raw bytes.
coleenp@3656 1669 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
duke@0 1670 SymbolHashMap *classmap) {
duke@0 1671 jint size = 0;
duke@0 1672
duke@0 1673 for (u2 idx = 1; idx < length(); idx++) {
duke@0 1674 u2 tag = tag_at(idx).value();
duke@0 1675 size += cpool_entry_size(idx);
duke@0 1676
duke@0 1677 switch(tag) {
duke@0 1678 case JVM_CONSTANT_Utf8: {
coleenp@2069 1679 Symbol* sym = symbol_at(idx);
duke@0 1680 symmap->add_entry(sym, idx);
duke@0 1681 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
duke@0 1682 break;
duke@0 1683 }
duke@0 1684 case JVM_CONSTANT_Class:
duke@0 1685 case JVM_CONSTANT_UnresolvedClass:
duke@0 1686 case JVM_CONSTANT_UnresolvedClassInError: {
coleenp@2069 1687 Symbol* sym = klass_name_at(idx);
duke@0 1688 classmap->add_entry(sym, idx);
duke@0 1689 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
duke@0 1690 break;
duke@0 1691 }
duke@0 1692 case JVM_CONSTANT_Long:
duke@0 1693 case JVM_CONSTANT_Double: {
duke@0 1694 idx++; // Both Long and Double take two cpool slots
duke@0 1695 break;
duke@0 1696 }
duke@0 1697 }
duke@0 1698 }
duke@0 1699 return size;
duke@0 1700 } /* end hash_utf8_entries_to */
duke@0 1701
duke@0 1702
duke@0 1703 // Copy cpool bytes.
duke@0 1704 // Returns:
duke@0 1705 // 0, in case of OutOfMemoryError
duke@0 1706 // -1, in case of internal error
duke@0 1707 // > 0, count of the raw cpool bytes that have been copied
coleenp@3656 1708 int ConstantPool::copy_cpool_bytes(int cpool_size,
duke@0 1709 SymbolHashMap* tbl,
duke@0 1710 unsigned char *bytes) {
duke@0 1711 u2 idx1, idx2;
duke@0 1712 jint size = 0;
duke@0 1713 jint cnt = length();
duke@0 1714 unsigned char *start_bytes = bytes;
duke@0 1715
duke@0 1716 for (jint idx = 1; idx < cnt; idx++) {
duke@0 1717 u1 tag = tag_at(idx).value();
duke@0 1718 jint ent_size = cpool_entry_size(idx);
duke@0 1719
duke@0 1720 assert(size + ent_size <= cpool_size, "Size mismatch");
duke@0 1721
duke@0 1722 *bytes = tag;
duke@0 1723 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
duke@0 1724 switch(tag) {
duke@0 1725 case JVM_CONSTANT_Invalid: {
duke@0 1726 DBG(printf("JVM_CONSTANT_Invalid"));
duke@0 1727 break;
duke@0 1728 }
duke@0 1729 case JVM_CONSTANT_Unicode: {
duke@0 1730 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
duke@0 1731 DBG(printf("JVM_CONSTANT_Unicode"));
duke@0 1732 break;
duke@0 1733 }
duke@0 1734 case JVM_CONSTANT_Utf8: {
coleenp@2069 1735 Symbol* sym = symbol_at(idx);
duke@0 1736 char* str = sym->as_utf8();
duke@0 1737 // Warning! It's crashing on x86 with len = sym->utf8_length()
duke@0 1738 int len = (int) strlen(str);
duke@0 1739 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
duke@0 1740 for (int i = 0; i < len; i++) {
duke@0 1741 bytes[3+i] = (u1) str[i];
duke@0 1742 }
duke@0 1743 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
duke@0 1744 break;
duke@0 1745 }
duke@0 1746 case JVM_CONSTANT_Integer: {
duke@0 1747 jint val = int_at(idx);
duke@0 1748 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
duke@0 1749 break;
duke@0 1750 }
duke@0 1751 case JVM_CONSTANT_Float: {
duke@0 1752 jfloat val = float_at(idx);
duke@0 1753 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
duke@0 1754 break;
duke@0 1755 }
duke@0 1756 case JVM_CONSTANT_Long: {
duke@0 1757 jlong val = long_at(idx);
duke@0 1758 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
duke@0 1759 idx++; // Long takes two cpool slots
duke@0 1760 break;
duke@0 1761 }
duke@0 1762 case JVM_CONSTANT_Double: {
duke@0 1763 jdouble val = double_at(idx);
duke@0 1764 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
duke@0 1765 idx++; // Double takes two cpool slots
duke@0 1766 break;
duke@0 1767 }
duke@0 1768 case JVM_CONSTANT_Class:
duke@0 1769 case JVM_CONSTANT_UnresolvedClass:
duke@0 1770 case JVM_CONSTANT_UnresolvedClassInError: {
duke@0 1771 *bytes = JVM_CONSTANT_Class;
coleenp@2069 1772 Symbol* sym = klass_name_at(idx);
duke@0 1773 idx1 = tbl->symbol_to_value(sym);
duke@0 1774 assert(idx1 != 0, "Have not found a hashtable entry");
duke@0 1775 Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@0 1776 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
duke@0 1777 break;
duke@0 1778 }
duke@0 1779 case JVM_CONSTANT_String: {
duke@0 1780 *bytes = JVM_CONSTANT_String;
coleenp@2069 1781 Symbol* sym = unresolved_string_at(idx);
duke@0 1782 idx1 = tbl->symbol_to_value(sym);
duke@0 1783 assert(idx1 != 0, "Have not found a hashtable entry");
duke@0 1784 Bytes::put_Java_u2((address) (bytes+1), idx1);
mikael@4540 1785 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8()));
duke@0 1786 break;
duke@0 1787 }
duke@0 1788 case JVM_CONSTANT_Fieldref:
duke@0 1789 case JVM_CONSTANT_Methodref:
duke@0 1790 case JVM_CONSTANT_InterfaceMethodref: {
duke@0 1791 idx1 = uncached_klass_ref_index_at(idx);
duke@0 1792 idx2 = uncached_name_and_type_ref_index_at(idx);
duke@0 1793 Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@0 1794 Bytes::put_Java_u2((address) (bytes+3), idx2);
duke@0 1795 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
duke@0 1796 break;
duke@0 1797 }
duke@0 1798 case JVM_CONSTANT_NameAndType: {
duke@0 1799 idx1 = name_ref_index_at(idx);
duke@0 1800 idx2 = signature_ref_index_at(idx);
duke@0 1801 Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@0 1802 Bytes::put_Java_u2((address) (bytes+3), idx2);
duke@0 1803 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
duke@0 1804 break;
duke@0 1805 }
duke@0 1806 case JVM_CONSTANT_ClassIndex: {
duke@0 1807 *bytes = JVM_CONSTANT_Class;
duke@0 1808 idx1 = klass_index_at(idx);
duke@0 1809 Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@0 1810 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
duke@0 1811 break;
duke@0 1812 }
duke@0 1813 case JVM_CONSTANT_StringIndex: {
duke@0 1814 *bytes = JVM_CONSTANT_String;
duke@0 1815 idx1 = string_index_at(idx);
duke@0 1816 Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@0 1817 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
duke@0 1818 break;
duke@0 1819 }
coleenp@3656 1820 case JVM_CONSTANT_MethodHandle:
coleenp@3656 1821 case JVM_CONSTANT_MethodHandleInError: {
jrose@1524 1822 *bytes = JVM_CONSTANT_MethodHandle;
jrose@1524 1823 int kind = method_handle_ref_kind_at(idx);
jrose@1524 1824 idx1 = method_handle_index_at(idx);
jrose@1524 1825 *(bytes+1) = (unsigned char) kind;
jrose@1524 1826 Bytes::put_Java_u2((address) (bytes+2), idx1);
jrose@1524 1827 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
jrose@1524 1828 break;
jrose@1524 1829 }
coleenp@3656 1830 case JVM_CONSTANT_MethodType:
coleenp@3656 1831 case JVM_CONSTANT_MethodTypeInError: {
jrose@1524 1832 *bytes = JVM_CONSTANT_MethodType;
jrose@1524 1833 idx1 = method_type_index_at(idx);
jrose@1524 1834 Bytes::put_Java_u2((address) (bytes+1), idx1);
jrose@1524 1835 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
jrose@1524 1836 break;
jrose@1524 1837 }
jrose@1583 1838 case JVM_CONSTANT_InvokeDynamic: {
jrose@1924 1839 *bytes = tag;
jrose@1924 1840 idx1 = extract_low_short_from_int(*int_at_addr(idx));
jrose@1924 1841 idx2 = extract_high_short_from_int(*int_at_addr(idx));
jrose@1924 1842 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
jrose@1583 1843 Bytes::put_Java_u2((address) (bytes+1), idx1);
jrose@1583 1844 Bytes::put_Java_u2((address) (bytes+3), idx2);
jrose@1924 1845 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
jrose@1583 1846 break;
jrose@1583 1847 }
duke@0 1848 }
duke@0 1849 DBG(printf("\n"));
duke@0 1850 bytes += ent_size;
duke@0 1851 size += ent_size;
duke@0 1852 }
duke@0 1853 assert(size == cpool_size, "Size mismatch");
duke@0 1854
duke@0 1855 // Keep temorarily for debugging until it's stable.
duke@0 1856 DBG(print_cpool_bytes(cnt, start_bytes));
duke@0 1857 return (int)(bytes - start_bytes);
duke@0 1858 } /* end copy_cpool_bytes */
duke@0 1859
mikael@4540 1860 #undef DBG
mikael@4540 1861
duke@0 1862
coleenp@3656 1863 void ConstantPool::set_on_stack(const bool value) {
coleenp@4132 1864 if (value) {
coleenp@4132 1865 _flags |= _on_stack;
coleenp@4132 1866 } else {
coleenp@4132 1867 _flags &= ~_on_stack;
coleenp@4132 1868 }
coleenp@3656 1869 if (value) MetadataOnStackMark::record(this);
coleenp@3656 1870 }
coleenp@3656 1871
coleenp@3656 1872 // JSR 292 support for patching constant pool oops after the class is linked and
coleenp@3656 1873 // the oop array for resolved references are created.
coleenp@3656 1874 // We can't do this during classfile parsing, which is how the other indexes are
coleenp@3656 1875 // patched. The other patches are applied early for some error checking
coleenp@3656 1876 // so only defer the pseudo_strings.
coleenp@3656 1877 void ConstantPool::patch_resolved_references(
coleenp@3656 1878 GrowableArray<Handle>* cp_patches) {
coleenp@3656 1879 assert(EnableInvokeDynamic, "");
coleenp@3656 1880 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
coleenp@3656 1881 Handle patch = cp_patches->at(index);
coleenp@3656 1882 if (patch.not_null()) {
coleenp@3656 1883 assert (tag_at(index).is_string(), "should only be string left");
coleenp@3656 1884 // Patching a string means pre-resolving it.
coleenp@3656 1885 // The spelling in the constant pool is ignored.
coleenp@3656 1886 // The constant reference may be any object whatever.
coleenp@3656 1887 // If it is not a real interned string, the constant is referred
coleenp@3656 1888 // to as a "pseudo-string", and must be presented to the CP
coleenp@3656 1889 // explicitly, because it may require scavenging.
coleenp@3656 1890 int obj_index = cp_to_object_index(index);
coleenp@3656 1891 pseudo_string_at_put(index, obj_index, patch());
coleenp@3656 1892 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
coleenp@3656 1893 }
coleenp@3656 1894 }
coleenp@3656 1895 #ifdef ASSERT
coleenp@3656 1896 // Ensure that all the patches have been used.
coleenp@3656 1897 for (int index = 0; index < cp_patches->length(); index++) {
coleenp@3656 1898 assert(cp_patches->at(index).is_null(),
coleenp@3656 1899 err_msg("Unused constant pool patch at %d in class file %s",
coleenp@3656 1900 index,
coleenp@3880 1901 pool_holder()->external_name()));
coleenp@3656 1902 }
coleenp@3656 1903 #endif // ASSERT
coleenp@3656 1904 }
coleenp@3656 1905
coleenp@3656 1906 #ifndef PRODUCT
coleenp@3656 1907
coleenp@3656 1908 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
coleenp@3656 1909 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
coleenp@3656 1910 guarantee(obj->is_constantPool(), "object must be constant pool");
coleenp@3656 1911 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
coleenp@3656 1912 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
coleenp@3656 1913
coleenp@3656 1914 for (int i = 0; i< cp->length(); i++) {
coleenp@3656 1915 if (cp->tag_at(i).is_unresolved_klass()) {
coleenp@3656 1916 // This will force loading of the class
coleenp@3656 1917 Klass* klass = cp->klass_at(i, CHECK);
coleenp@3656 1918 if (klass->oop_is_instance()) {
coleenp@3656 1919 // Force initialization of class
coleenp@3656 1920 InstanceKlass::cast(klass)->initialize(CHECK);
coleenp@3656 1921 }
coleenp@3656 1922 }
coleenp@3656 1923 }
coleenp@3656 1924 }
coleenp@3656 1925
coleenp@3656 1926 #endif
coleenp@3656 1927
coleenp@3656 1928
coleenp@3656 1929 // Printing
coleenp@3656 1930
coleenp@3656 1931 void ConstantPool::print_on(outputStream* st) const {
coleenp@3656 1932 EXCEPTION_MARK;
coleenp@3656 1933 assert(is_constantPool(), "must be constantPool");
coleenp@3656 1934 st->print_cr(internal_name());
coleenp@3656 1935 if (flags() != 0) {
coleenp@3656 1936 st->print(" - flags: 0x%x", flags());
coleenp@3656 1937 if (has_preresolution()) st->print(" has_preresolution");
coleenp@4132 1938 if (on_stack()) st->print(" on_stack");
coleenp@3656 1939 st->cr();
coleenp@3656 1940 }
coleenp@3656 1941 if (pool_holder() != NULL) {
coleenp@3656 1942 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
coleenp@3656 1943 }
coleenp@3656 1944 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
coleenp@3656 1945 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
coleenp@3656 1946 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
coleenp@3656 1947
coleenp@3656 1948 for (int index = 1; index < length(); index++) { // Index 0 is unused
coleenp@3656 1949 ((ConstantPool*)this)->print_entry_on(index, st);
coleenp@3656 1950 switch (tag_at(index).value()) {
coleenp@3656 1951 case JVM_CONSTANT_Long :
coleenp@3656 1952 case JVM_CONSTANT_Double :
coleenp@3656 1953 index++; // Skip entry following eigth-byte constant
coleenp@3656 1954 }
coleenp@3656 1955
coleenp@3656 1956 }
coleenp@3656 1957 st->cr();
coleenp@3656 1958 }
coleenp@3656 1959
coleenp@3656 1960 // Print one constant pool entry
coleenp@3656 1961 void ConstantPool::print_entry_on(const int index, outputStream* st) {
coleenp@3656 1962 EXCEPTION_MARK;
coleenp@3656 1963 st->print(" - %3d : ", index);
coleenp@3656 1964 tag_at(index).print_on(st);
coleenp@3656 1965 st->print(" : ");
coleenp@3656 1966 switch (tag_at(index).value()) {
coleenp@3656 1967 case JVM_CONSTANT_Class :
coleenp@3656 1968 { Klass* k = klass_at(index, CATCH);
morris@4430 1969 guarantee(k != NULL, "need klass");
coleenp@3656 1970 k->print_value_on(st);
coleenp@3656 1971 st->print(" {0x%lx}", (address)k);
coleenp@3656 1972 }
coleenp@3656 1973 break;
coleenp@3656 1974 case JVM_CONSTANT_Fieldref :
coleenp@3656 1975 case JVM_CONSTANT_Methodref :
coleenp@3656 1976 case JVM_CONSTANT_InterfaceMethodref :
coleenp@3656 1977 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
coleenp@3656 1978 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
coleenp@3656 1979 break;
coleenp@3656 1980 case JVM_CONSTANT_String :
coleenp@4288 1981 if (is_pseudo_string_at(index)) {
coleenp@4288 1982 oop anObj = pseudo_string_at(index);
coleenp@4288 1983 anObj->print_value_on(st);
coleenp@4288 1984 st->print(" {0x%lx}", (address)anObj);
coleenp@4288 1985 } else {
coleenp@4288 1986 unresolved_string_at(index)->print_value_on(st);
coleenp@4288 1987 }
coleenp@3656 1988 break;
coleenp@3656 1989 case JVM_CONSTANT_Integer :
coleenp@3656 1990 st->print("%d", int_at(index));
coleenp@3656 1991 break;
coleenp@3656 1992 case JVM_CONSTANT_Float :
coleenp@3656 1993 st->print("%f", float_at(index));
coleenp@3656 1994 break;
coleenp@3656 1995 case JVM_CONSTANT_Long :
coleenp@3656 1996 st->print_jlong(long_at(index));
coleenp@3656 1997 break;
coleenp@3656 1998 case JVM_CONSTANT_Double :
coleenp@3656 1999 st->print("%lf", double_at(index));
coleenp@3656 2000 break;
coleenp@3656 2001 case JVM_CONSTANT_NameAndType :
coleenp@3656 2002 st->print("name_index=%d", name_ref_index_at(index));
coleenp@3656 2003 st->print(" signature_index=%d", signature_ref_index_at(index));
coleenp@3656 2004 break;
coleenp@3656 2005 case JVM_CONSTANT_Utf8 :
coleenp@3656 2006 symbol_at(index)->print_value_on(st);
coleenp@3656 2007 break;
coleenp@3656 2008 case JVM_CONSTANT_UnresolvedClass : // fall-through
coleenp@3656 2009 case JVM_CONSTANT_UnresolvedClassInError: {
coleenp@3656 2010 // unresolved_klass_at requires lock or safe world.
coleenp@3656 2011 CPSlot entry = slot_at(index);
coleenp@3656 2012 if (entry.is_resolved()) {
coleenp@3656 2013 entry.get_klass()->print_value_on(st);
coleenp@3656 2014 } else {
coleenp@3656 2015 entry.get_symbol()->print_value_on(st);
coleenp@3656 2016 }
coleenp@3656 2017 }
coleenp@3656 2018 break;
coleenp@3656 2019 case JVM_CONSTANT_MethodHandle :
coleenp@3656 2020 case JVM_CONSTANT_MethodHandleInError :
coleenp@3656 2021 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
coleenp@3656 2022 st->print(" ref_index=%d", method_handle_index_at(index));
coleenp@3656 2023 break;
coleenp@3656 2024 case JVM_CONSTANT_MethodType :
coleenp@3656 2025 case JVM_CONSTANT_MethodTypeInError :
coleenp@3656 2026 st->print("signature_index=%d", method_type_index_at(index));
coleenp@3656 2027 break;
coleenp@3656 2028 case JVM_CONSTANT_InvokeDynamic :
coleenp@3656 2029 {
coleenp@3656 2030 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
coleenp@3656 2031 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
coleenp@3656 2032 int argc = invoke_dynamic_argument_count_at(index);
coleenp@3656 2033 if (argc > 0) {
coleenp@3656 2034 for (int arg_i = 0; arg_i < argc; arg_i++) {
coleenp@3656 2035 int arg = invoke_dynamic_argument_index_at(index, arg_i);
coleenp@3656 2036 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
coleenp@3656 2037 }
coleenp@3656 2038 st->print("}");
coleenp@3656 2039 }
coleenp@3656 2040 }
coleenp@3656 2041 break;
coleenp@3656 2042 default:
coleenp@3656 2043 ShouldNotReachHere();
coleenp@3656 2044 break;
coleenp@3656 2045 }
coleenp@3656 2046 st->cr();
coleenp@3656 2047 }
coleenp@3656 2048
coleenp@3656 2049 void ConstantPool::print_value_on(outputStream* st) const {
coleenp@3656 2050 assert(is_constantPool(), "must be constantPool");
coleenp@3656 2051 st->print("constant pool [%d]", length());
coleenp@3656 2052 if (has_preresolution()) st->print("/preresolution");
coleenp@3656 2053 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
coleenp@3656 2054 print_address_on(st);
coleenp@3656 2055 st->print(" for ");
coleenp@3656 2056 pool_holder()->print_value_on(st);
coleenp@3656 2057 if (pool_holder() != NULL) {
coleenp@3880 2058 bool extra = (pool_holder()->constants() != this);
coleenp@3656 2059 if (extra) st->print(" (extra)");
coleenp@3656 2060 }
coleenp@3656 2061 if (cache() != NULL) {
coleenp@3656 2062 st->print(" cache=" PTR_FORMAT, cache());
coleenp@3656 2063 }
coleenp@3656 2064 }
coleenp@3656 2065
acorn@4139 2066 #if INCLUDE_SERVICES
acorn@4139 2067 // Size Statistics
acorn@4139 2068 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
acorn@4139 2069 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
acorn@4139 2070 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
acorn@4139 2071 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
acorn@4139 2072 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
acorn@4139 2073 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
acorn@4139 2074
acorn@4139 2075 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
acorn@4139 2076 sz->_cp_refmap_bytes;
acorn@4139 2077 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
acorn@4139 2078 }
acorn@4139 2079 #endif // INCLUDE_SERVICES
coleenp@3656 2080
coleenp@3656 2081 // Verification
coleenp@3656 2082
coleenp@3656 2083 void ConstantPool::verify_on(outputStream* st) {
coleenp@3656 2084 guarantee(is_constantPool(), "object must be constant pool");
coleenp@3656 2085 for (int i = 0; i< length(); i++) {
coleenp@3656 2086 constantTag tag = tag_at(i);
coleenp@3656 2087 CPSlot entry = slot_at(i);
coleenp@3656 2088 if (tag.is_klass()) {
coleenp@3656 2089 if (entry.is_resolved()) {
coleenp@3656 2090 guarantee(entry.get_klass()->is_klass(), "should be klass");
coleenp@3656 2091 }
coleenp@3656 2092 } else if (tag.is_unresolved_klass()) {
coleenp@3656 2093 if (entry.is_resolved()) {
coleenp@3656 2094 guarantee(entry.get_klass()->is_klass(), "should be klass");
coleenp@3656 2095 }
coleenp@3656 2096 } else if (tag.is_symbol()) {
coleenp@3656 2097 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
coleenp@3656 2098 } else if (tag.is_string()) {
coleenp@3656 2099 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
coleenp@3656 2100 }
coleenp@3656 2101 }
coleenp@3656 2102 if (cache() != NULL) {
coleenp@3656 2103 // Note: cache() can be NULL before a class is completely setup or
coleenp@3656 2104 // in temporary constant pools used during constant pool merging
coleenp@3656 2105 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
coleenp@3656 2106 }
coleenp@3656 2107 if (pool_holder() != NULL) {
coleenp@3656 2108 // Note: pool_holder() can be NULL in temporary constant pools
coleenp@3656 2109 // used during constant pool merging
coleenp@3656 2110 guarantee(pool_holder()->is_klass(), "should be klass");
coleenp@3656 2111 }
coleenp@3656 2112 }
coleenp@3656 2113
coleenp@3656 2114
coleenp@2069 2115 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
duke@0 2116 char *str = sym->as_utf8();
duke@0 2117 unsigned int hash = compute_hash(str, sym->utf8_length());
duke@0 2118 unsigned int index = hash % table_size();
duke@0 2119
duke@0 2120 // check if already in map
duke@0 2121 // we prefer the first entry since it is more likely to be what was used in
duke@0 2122 // the class file
duke@0 2123 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
duke@0 2124 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@0 2125 if (en->hash() == hash && en->symbol() == sym) {
duke@0 2126 return; // already there
duke@0 2127 }
duke@0 2128 }
duke@0 2129
duke@0 2130 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
duke@0 2131 entry->set_next(bucket(index));
duke@0 2132 _buckets[index].set_entry(entry);
duke@0 2133 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@0 2134 }
duke@0 2135
coleenp@2069 2136 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
duke@0 2137 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
duke@0 2138 char *str = sym->as_utf8();
duke@0 2139 int len = sym->utf8_length();
duke@0 2140 unsigned int hash = SymbolHashMap::compute_hash(str, len);
duke@0 2141 unsigned int index = hash % table_size();
duke@0 2142 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
duke@0 2143 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@0 2144 if (en->hash() == hash && en->symbol() == sym) {
duke@0 2145 return en;
duke@0 2146 }
duke@0 2147 }
duke@0 2148 return NULL;
duke@0 2149 }