Mercurial > hg > graal-jvmci-8
comparison src/share/vm/oops/constantPool.cpp @ 6948:e522a00b91aa
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/ after NPG - C++ build works
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 12 Nov 2012 23:14:12 +0100 |
parents | src/share/vm/oops/constantPoolOop.cpp@957c266d8bc5 src/share/vm/oops/constantPoolOop.cpp@18fb7da42534 |
children | 291ffc492eb6 |
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1 /* | |
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "classfile/classLoaderData.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/symbolTable.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "classfile/vmSymbols.hpp" | |
31 #include "interpreter/linkResolver.hpp" | |
32 #include "memory/metadataFactory.hpp" | |
33 #include "memory/oopFactory.hpp" | |
34 #include "oops/constantPool.hpp" | |
35 #include "oops/instanceKlass.hpp" | |
36 #include "oops/objArrayKlass.hpp" | |
37 #include "prims/jvmtiRedefineClasses.hpp" | |
38 #include "runtime/fieldType.hpp" | |
39 #include "runtime/init.hpp" | |
40 #include "runtime/javaCalls.hpp" | |
41 #include "runtime/signature.hpp" | |
42 #include "runtime/vframe.hpp" | |
43 | |
44 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { | |
45 // Tags are RW but comment below applies to tags also. | |
46 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); | |
47 | |
48 int size = ConstantPool::size(length); | |
49 | |
50 // CDS considerations: | |
51 // Allocate read-write but may be able to move to read-only at dumping time | |
52 // if all the klasses are resolved. The only other field that is writable is | |
53 // the resolved_references array, which is recreated at startup time. | |
54 // But that could be moved to InstanceKlass (although a pain to access from | |
55 // assembly code). Maybe it could be moved to the cpCache which is RW. | |
56 return new (loader_data, size, false, THREAD) ConstantPool(tags); | |
57 } | |
58 | |
59 ConstantPool::ConstantPool(Array<u1>* tags) { | |
60 set_length(tags->length()); | |
61 set_tags(NULL); | |
62 set_cache(NULL); | |
63 set_reference_map(NULL); | |
64 set_resolved_references(NULL); | |
65 set_operands(NULL); | |
66 set_pool_holder(NULL); | |
67 set_flags(0); | |
68 // only set to non-zero if constant pool is merged by RedefineClasses | |
69 set_orig_length(0); | |
70 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); | |
71 // all fields are initialized; needed for GC | |
72 set_on_stack(false); | |
73 | |
74 // initialize tag array | |
75 int length = tags->length(); | |
76 for (int index = 0; index < length; index++) { | |
77 tags->at_put(index, JVM_CONSTANT_Invalid); | |
78 } | |
79 set_tags(tags); | |
80 } | |
81 | |
82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { | |
83 MetadataFactory::free_metadata(loader_data, cache()); | |
84 set_cache(NULL); | |
85 MetadataFactory::free_array<jushort>(loader_data, operands()); | |
86 set_operands(NULL); | |
87 | |
88 release_C_heap_structures(); | |
89 | |
90 // free tag array | |
91 MetadataFactory::free_array<u1>(loader_data, tags()); | |
92 set_tags(NULL); | |
93 } | |
94 | |
95 void ConstantPool::release_C_heap_structures() { | |
96 // walk constant pool and decrement symbol reference counts | |
97 unreference_symbols(); | |
98 | |
99 delete _lock; | |
100 set_lock(NULL); | |
101 } | |
102 | |
103 void ConstantPool::set_flag_at(FlagBit fb) { | |
104 const int MAX_STATE_CHANGES = 2; | |
105 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) { | |
106 int oflags = _flags; | |
107 int nflags = oflags | (1 << (int)fb); | |
108 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags) | |
109 return; | |
110 } | |
111 assert(false, "failed to cmpxchg flags"); | |
112 _flags |= (1 << (int)fb); // better than nothing | |
113 } | |
114 | |
115 objArrayOop ConstantPool::resolved_references() const { | |
116 return (objArrayOop)JNIHandles::resolve(_resolved_references); | |
117 } | |
118 | |
119 // Create resolved_references array and mapping array for original cp indexes | |
120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way | |
121 // to map it back for resolving and some unlikely miscellaneous uses. | |
122 // The objects created by invokedynamic are appended to this list. | |
123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, | |
124 intStack reference_map, | |
125 int constant_pool_map_length, | |
126 TRAPS) { | |
127 // Initialized the resolved object cache. | |
128 int map_length = reference_map.length(); | |
129 if (map_length > 0) { | |
130 // Only need mapping back to constant pool entries. The map isn't used for | |
131 // invokedynamic resolved_reference entries. The constant pool cache index | |
132 // has the mapping back to both the constant pool and to the resolved | |
133 // reference index. | |
134 if (constant_pool_map_length > 0) { | |
135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); | |
136 | |
137 for (int i = 0; i < constant_pool_map_length; i++) { | |
138 int x = reference_map.at(i); | |
139 assert(x == (int)(jushort) x, "klass index is too big"); | |
140 om->at_put(i, (jushort)x); | |
141 } | |
142 set_reference_map(om); | |
143 } | |
144 | |
145 // Create Java array for holding resolved strings, methodHandles, | |
146 // methodTypes, invokedynamic and invokehandle appendix objects, etc. | |
147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); | |
148 Handle refs_handle (THREAD, (oop)stom); // must handleize. | |
149 set_resolved_references(loader_data->add_handle(refs_handle)); | |
150 } | |
151 } | |
152 | |
153 // CDS support. Create a new resolved_references array. | |
154 void ConstantPool::restore_unshareable_info(TRAPS) { | |
155 | |
156 // restore the C++ vtable from the shared archive | |
157 restore_vtable(); | |
158 | |
159 if (SystemDictionary::Object_klass_loaded()) { | |
160 // Recreate the object array and add to ClassLoaderData. | |
161 int map_length = resolved_reference_length(); | |
162 if (map_length > 0) { | |
163 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); | |
164 Handle refs_handle (THREAD, (oop)stom); // must handleize. | |
165 | |
166 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); | |
167 set_resolved_references(loader_data->add_handle(refs_handle)); | |
168 } | |
169 | |
170 // Also need to recreate the mutex. Make sure this matches the constructor | |
171 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); | |
172 } | |
173 } | |
174 | |
175 void ConstantPool::remove_unshareable_info() { | |
176 // Resolved references are not in the shared archive. | |
177 // Save the length for restoration. It is not necessarily the same length | |
178 // as reference_map.length() if invokedynamic is saved. | |
179 set_resolved_reference_length( | |
180 resolved_references() != NULL ? resolved_references()->length() : 0); | |
181 set_resolved_references(NULL); | |
182 set_lock(NULL); | |
183 } | |
184 | |
185 int ConstantPool::cp_to_object_index(int cp_index) { | |
186 // this is harder don't do this so much. | |
187 for (int i = 0; i< reference_map()->length(); i++) { | |
188 if (reference_map()->at(i) == cp_index) return i; | |
189 // Zero entry is divider between constant pool indices for strings, | |
190 // method handles and method types. After that the index is a constant | |
191 // pool cache index for invokedynamic. Stop when zero (which can never | |
192 // be a constant pool index) | |
193 if (reference_map()->at(i) == 0) break; | |
194 } | |
195 // We might not find the index. | |
196 return _no_index_sentinel; | |
197 } | |
198 | |
199 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { | |
200 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. | |
201 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and | |
202 // tag is not updated atomicly. | |
203 | |
204 CPSlot entry = this_oop->slot_at(which); | |
205 if (entry.is_resolved()) { | |
206 assert(entry.get_klass()->is_klass(), "must be"); | |
207 // Already resolved - return entry. | |
208 return entry.get_klass(); | |
209 } | |
210 | |
211 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
212 // already has updated the object | |
213 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
214 bool do_resolve = false; | |
215 bool in_error = false; | |
216 | |
217 // Create a handle for the mirror. This will preserve the resolved class | |
218 // until the loader_data is registered. | |
219 Handle mirror_handle; | |
220 | |
221 Symbol* name = NULL; | |
222 Handle loader; | |
223 { MonitorLockerEx ml(this_oop->lock()); | |
224 | |
225 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
227 in_error = true; | |
228 } else { | |
229 do_resolve = true; | |
230 name = this_oop->unresolved_klass_at(which); | |
231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); | |
232 } | |
233 } | |
234 } // unlocking constantPool | |
235 | |
236 | |
237 // The original attempt to resolve this constant pool entry failed so find the | |
238 // original error and throw it again (JVMS 5.4.3). | |
239 if (in_error) { | |
240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); | |
241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); | |
242 ResourceMark rm; | |
243 // exception text will be the class name | |
244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
245 THROW_MSG_0(error, className); | |
246 } | |
247 | |
248 if (do_resolve) { | |
249 // this_oop must be unlocked during resolve_or_fail | |
250 oop protection_domain = this_oop->pool_holder()->protection_domain(); | |
251 Handle h_prot (THREAD, protection_domain); | |
252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); | |
253 KlassHandle k; | |
254 if (!HAS_PENDING_EXCEPTION) { | |
255 k = KlassHandle(THREAD, k_oop); | |
256 // preserve the resolved klass. | |
257 mirror_handle = Handle(THREAD, k_oop->java_mirror()); | |
258 // Do access check for klasses | |
259 verify_constant_pool_resolve(this_oop, k, THREAD); | |
260 } | |
261 | |
262 // Failed to resolve class. We must record the errors so that subsequent attempts | |
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
264 if (HAS_PENDING_EXCEPTION) { | |
265 ResourceMark rm; | |
266 Symbol* error = PENDING_EXCEPTION->klass()->name(); | |
267 | |
268 bool throw_orig_error = false; | |
269 { | |
270 MonitorLockerEx ml(this_oop->lock()); | |
271 | |
272 // some other thread has beaten us and has resolved the class. | |
273 if (this_oop->tag_at(which).is_klass()) { | |
274 CLEAR_PENDING_EXCEPTION; | |
275 entry = this_oop->resolved_klass_at(which); | |
276 return entry.get_klass(); | |
277 } | |
278 | |
279 if (!PENDING_EXCEPTION-> | |
280 is_a(SystemDictionary::LinkageError_klass())) { | |
281 // Just throw the exception and don't prevent these classes from | |
282 // being loaded due to virtual machine errors like StackOverflow | |
283 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
284 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
285 } | |
286 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
287 SystemDictionary::add_resolution_error(this_oop, which, error); | |
288 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
289 } else { | |
290 // some other thread has put the class in error state. | |
291 error = SystemDictionary::find_resolution_error(this_oop, which); | |
292 assert(error != NULL, "checking"); | |
293 throw_orig_error = true; | |
294 } | |
295 } // unlocked | |
296 | |
297 if (throw_orig_error) { | |
298 CLEAR_PENDING_EXCEPTION; | |
299 ResourceMark rm; | |
300 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
301 THROW_MSG_0(error, className); | |
302 } | |
303 | |
304 return 0; | |
305 } | |
306 | |
307 if (TraceClassResolution && !k()->oop_is_array()) { | |
308 // skip resolving the constant pool so that this code get's | |
309 // called the next time some bytecodes refer to this class. | |
310 ResourceMark rm; | |
311 int line_number = -1; | |
312 const char * source_file = NULL; | |
313 if (JavaThread::current()->has_last_Java_frame()) { | |
314 // try to identify the method which called this function. | |
315 vframeStream vfst(JavaThread::current()); | |
316 if (!vfst.at_end()) { | |
317 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
318 Symbol* s = vfst.method()->method_holder()->source_file_name(); | |
319 if (s != NULL) { | |
320 source_file = s->as_C_string(); | |
321 } | |
322 } | |
323 } | |
324 if (k() != this_oop->pool_holder()) { | |
325 // only print something if the classes are different | |
326 if (source_file != NULL) { | |
327 tty->print("RESOLVE %s %s %s:%d\n", | |
328 this_oop->pool_holder()->external_name(), | |
329 InstanceKlass::cast(k())->external_name(), source_file, line_number); | |
330 } else { | |
331 tty->print("RESOLVE %s %s\n", | |
332 this_oop->pool_holder()->external_name(), | |
333 InstanceKlass::cast(k())->external_name()); | |
334 } | |
335 } | |
336 return k(); | |
337 } else { | |
338 MonitorLockerEx ml(this_oop->lock()); | |
339 // Only updated constant pool - if it is resolved. | |
340 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
341 if (do_resolve) { | |
342 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); | |
343 if (!this_key->is_the_null_class_loader_data()) { | |
344 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM | |
345 } | |
346 this_oop->klass_at_put(which, k()); | |
347 } | |
348 } | |
349 } | |
350 | |
351 entry = this_oop->resolved_klass_at(which); | |
352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); | |
353 return entry.get_klass(); | |
354 } | |
355 | |
356 | |
357 // Does not update ConstantPool* - to avoid any exception throwing. Used | |
358 // by compiler and exception handling. Also used to avoid classloads for | |
359 // instanceof operations. Returns NULL if the class has not been loaded or | |
360 // if the verification of constant pool failed | |
361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { | |
362 CPSlot entry = this_oop->slot_at(which); | |
363 if (entry.is_resolved()) { | |
364 assert(entry.get_klass()->is_klass(), "must be"); | |
365 return entry.get_klass(); | |
366 } else { | |
367 assert(entry.is_unresolved(), "must be either symbol or klass"); | |
368 Thread *thread = Thread::current(); | |
369 Symbol* name = entry.get_symbol(); | |
370 oop loader = this_oop->pool_holder()->class_loader(); | |
371 oop protection_domain = this_oop->pool_holder()->protection_domain(); | |
372 Handle h_prot (thread, protection_domain); | |
373 Handle h_loader (thread, loader); | |
374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); | |
375 | |
376 if (k != NULL) { | |
377 // Make sure that resolving is legal | |
378 EXCEPTION_MARK; | |
379 KlassHandle klass(THREAD, k); | |
380 // return NULL if verification fails | |
381 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
382 if (HAS_PENDING_EXCEPTION) { | |
383 CLEAR_PENDING_EXCEPTION; | |
384 return NULL; | |
385 } | |
386 return klass(); | |
387 } else { | |
388 return k; | |
389 } | |
390 } | |
391 } | |
392 | |
393 | |
394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { | |
395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); | |
396 } | |
397 | |
398 | |
399 // This is an interface for the compiler that allows accessing non-resolved entries | |
400 // in the constant pool - but still performs the validations tests. Must be used | |
401 // in a pre-parse of the compiler - to determine what it can do and not do. | |
402 // Note: We cannot update the ConstantPool from the vm_thread. | |
403 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { | |
404 int which = this_oop->klass_ref_index_at(index); | |
405 CPSlot entry = this_oop->slot_at(which); | |
406 if (entry.is_resolved()) { | |
407 assert(entry.get_klass()->is_klass(), "must be"); | |
408 return entry.get_klass(); | |
409 } else { | |
410 assert(entry.is_unresolved(), "must be either symbol or klass"); | |
411 Symbol* name = entry.get_symbol(); | |
412 oop loader = this_oop->pool_holder()->class_loader(); | |
413 oop protection_domain = this_oop->pool_holder()->protection_domain(); | |
414 Handle h_loader(THREAD, loader); | |
415 Handle h_prot (THREAD, protection_domain); | |
416 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
417 | |
418 // Do access check for klasses | |
419 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
420 return k(); | |
421 } | |
422 } | |
423 | |
424 | |
425 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, | |
426 int which) { | |
427 if (cpool->cache() == NULL) return NULL; // nothing to load yet | |
428 int cache_index = decode_cpcache_index(which, true); | |
429 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { | |
430 // FIXME: should be an assert | |
431 if (PrintMiscellaneous && (Verbose||WizardMode)) { | |
432 tty->print_cr("bad operand %d in:", which); cpool->print(); | |
433 } | |
434 return NULL; | |
435 } | |
436 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); | |
437 return e->method_if_resolved(cpool); | |
438 } | |
439 | |
440 | |
441 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { | |
442 if (cpool->cache() == NULL) return false; // nothing to load yet | |
443 int cache_index = decode_cpcache_index(which, true); | |
444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); | |
445 return e->has_appendix(); | |
446 } | |
447 | |
448 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { | |
449 if (cpool->cache() == NULL) return NULL; // nothing to load yet | |
450 int cache_index = decode_cpcache_index(which, true); | |
451 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); | |
452 return e->appendix_if_resolved(cpool); | |
453 } | |
454 | |
455 | |
456 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { | |
457 if (cpool->cache() == NULL) return false; // nothing to load yet | |
458 int cache_index = decode_cpcache_index(which, true); | |
459 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); | |
460 return e->has_method_type(); | |
461 } | |
462 | |
463 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { | |
464 if (cpool->cache() == NULL) return NULL; // nothing to load yet | |
465 int cache_index = decode_cpcache_index(which, true); | |
466 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); | |
467 return e->method_type_if_resolved(cpool); | |
468 } | |
469 | |
470 | |
471 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { | |
472 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); | |
473 return symbol_at(name_index); | |
474 } | |
475 | |
476 | |
477 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { | |
478 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); | |
479 return symbol_at(signature_index); | |
480 } | |
481 | |
482 | |
483 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { | |
484 int i = which; | |
485 if (!uncached && cache() != NULL) { | |
486 if (ConstantPool::is_invokedynamic_index(which)) { | |
487 // Invokedynamic index is index into resolved_references | |
488 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); | |
489 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); | |
490 assert(tag_at(pool_index).is_name_and_type(), ""); | |
491 return pool_index; | |
492 } | |
493 // change byte-ordering and go via cache | |
494 i = remap_instruction_operand_from_cache(which); | |
495 } else { | |
496 if (tag_at(which).is_invoke_dynamic()) { | |
497 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); | |
498 assert(tag_at(pool_index).is_name_and_type(), ""); | |
499 return pool_index; | |
500 } | |
501 } | |
502 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); | |
503 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); | |
504 jint ref_index = *int_at_addr(i); | |
505 return extract_high_short_from_int(ref_index); | |
506 } | |
507 | |
508 | |
509 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { | |
510 guarantee(!ConstantPool::is_invokedynamic_index(which), | |
511 "an invokedynamic instruction does not have a klass"); | |
512 int i = which; | |
513 if (!uncached && cache() != NULL) { | |
514 // change byte-ordering and go via cache | |
515 i = remap_instruction_operand_from_cache(which); | |
516 } | |
517 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); | |
518 jint ref_index = *int_at_addr(i); | |
519 return extract_low_short_from_int(ref_index); | |
520 } | |
521 | |
522 | |
523 | |
524 int ConstantPool::remap_instruction_operand_from_cache(int operand) { | |
525 int cpc_index = operand; | |
526 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
527 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
528 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); | |
529 return member_index; | |
530 } | |
531 | |
532 | |
533 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { | |
534 if (k->oop_is_instance() || k->oop_is_objArray()) { | |
535 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
536 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); | |
537 KlassHandle element (THREAD, elem_oop); | |
538 | |
539 // The element type could be a typeArray - we only need the access check if it is | |
540 // an reference to another class | |
541 if (element->oop_is_instance()) { | |
542 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
543 } | |
544 } | |
545 } | |
546 | |
547 | |
548 int ConstantPool::name_ref_index_at(int which_nt) { | |
549 jint ref_index = name_and_type_at(which_nt); | |
550 return extract_low_short_from_int(ref_index); | |
551 } | |
552 | |
553 | |
554 int ConstantPool::signature_ref_index_at(int which_nt) { | |
555 jint ref_index = name_and_type_at(which_nt); | |
556 return extract_high_short_from_int(ref_index); | |
557 } | |
558 | |
559 | |
560 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { | |
561 return klass_at(klass_ref_index_at(which), CHECK_NULL); | |
562 } | |
563 | |
564 | |
565 Symbol* ConstantPool::klass_name_at(int which) { | |
566 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), | |
567 "Corrupted constant pool"); | |
568 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. | |
569 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and | |
570 // tag is not updated atomicly. | |
571 CPSlot entry = slot_at(which); | |
572 if (entry.is_resolved()) { | |
573 // Already resolved - return entry's name. | |
574 assert(entry.get_klass()->is_klass(), "must be"); | |
575 return entry.get_klass()->name(); | |
576 } else { | |
577 assert(entry.is_unresolved(), "must be either symbol or klass"); | |
578 return entry.get_symbol(); | |
579 } | |
580 } | |
581 | |
582 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { | |
583 jint ref_index = klass_ref_index_at(which); | |
584 return klass_at_noresolve(ref_index); | |
585 } | |
586 | |
587 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { | |
588 jint ref_index = uncached_klass_ref_index_at(which); | |
589 return klass_at_noresolve(ref_index); | |
590 } | |
591 | |
592 char* ConstantPool::string_at_noresolve(int which) { | |
593 Symbol* s = unresolved_string_at(which); | |
594 if (s == NULL) { | |
595 return (char*)"<pseudo-string>"; | |
596 } else { | |
597 return unresolved_string_at(which)->as_C_string(); | |
598 } | |
599 } | |
600 | |
601 BasicType ConstantPool::basic_type_for_signature_at(int which) { | |
602 return FieldType::basic_type(symbol_at(which)); | |
603 } | |
604 | |
605 | |
606 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { | |
607 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused | |
608 if (this_oop->tag_at(index).is_string()) { | |
609 this_oop->string_at(index, CHECK); | |
610 } | |
611 } | |
612 } | |
613 | |
614 // Resolve all the classes in the constant pool. If they are all resolved, | |
615 // the constant pool is read-only. Enhancement: allocate cp entries to | |
616 // another metaspace, and copy to read-only or read-write space if this | |
617 // bit is set. | |
618 bool ConstantPool::resolve_class_constants(TRAPS) { | |
619 constantPoolHandle cp(THREAD, this); | |
620 for (int index = 1; index < length(); index++) { // Index 0 is unused | |
621 if (tag_at(index).is_unresolved_klass() && | |
622 klass_at_if_loaded(cp, index) == NULL) { | |
623 return false; | |
624 } | |
625 } | |
626 // set_preresolution(); or some bit for future use | |
627 return true; | |
628 } | |
629 | |
630 // If resolution for MethodHandle or MethodType fails, save the exception | |
631 // in the resolution error table, so that the same exception is thrown again. | |
632 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, | |
633 int tag, TRAPS) { | |
634 ResourceMark rm; | |
635 Symbol* error = PENDING_EXCEPTION->klass()->name(); | |
636 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. | |
637 | |
638 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? | |
639 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; | |
640 | |
641 if (!PENDING_EXCEPTION-> | |
642 is_a(SystemDictionary::LinkageError_klass())) { | |
643 // Just throw the exception and don't prevent these classes from | |
644 // being loaded due to virtual machine errors like StackOverflow | |
645 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
646 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
647 | |
648 } else if (this_oop->tag_at(which).value() != error_tag) { | |
649 SystemDictionary::add_resolution_error(this_oop, which, error); | |
650 this_oop->tag_at_put(which, error_tag); | |
651 } else { | |
652 // some other thread has put the class in error state. | |
653 error = SystemDictionary::find_resolution_error(this_oop, which); | |
654 assert(error != NULL, "checking"); | |
655 CLEAR_PENDING_EXCEPTION; | |
656 THROW_MSG(error, ""); | |
657 } | |
658 } | |
659 | |
660 | |
661 // Called to resolve constants in the constant pool and return an oop. | |
662 // Some constant pool entries cache their resolved oop. This is also | |
663 // called to create oops from constants to use in arguments for invokedynamic | |
664 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { | |
665 oop result_oop = NULL; | |
666 Handle throw_exception; | |
667 | |
668 if (cache_index == _possible_index_sentinel) { | |
669 // It is possible that this constant is one which is cached in the objects. | |
670 // We'll do a linear search. This should be OK because this usage is rare. | |
671 assert(index > 0, "valid index"); | |
672 cache_index = this_oop->cp_to_object_index(index); | |
673 } | |
674 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); | |
675 assert(index == _no_index_sentinel || index >= 0, ""); | |
676 | |
677 if (cache_index >= 0) { | |
678 result_oop = this_oop->resolved_references()->obj_at(cache_index); | |
679 if (result_oop != NULL) { | |
680 return result_oop; | |
681 // That was easy... | |
682 } | |
683 index = this_oop->object_to_cp_index(cache_index); | |
684 } | |
685 | |
686 jvalue prim_value; // temp used only in a few cases below | |
687 | |
688 int tag_value = this_oop->tag_at(index).value(); | |
689 | |
690 switch (tag_value) { | |
691 | |
692 case JVM_CONSTANT_UnresolvedClass: | |
693 case JVM_CONSTANT_UnresolvedClassInError: | |
694 case JVM_CONSTANT_Class: | |
695 { | |
696 assert(cache_index == _no_index_sentinel, "should not have been set"); | |
697 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); | |
698 // ldc wants the java mirror. | |
699 result_oop = resolved->java_mirror(); | |
700 break; | |
701 } | |
702 | |
703 case JVM_CONSTANT_String: | |
704 assert(cache_index != _no_index_sentinel, "should have been set"); | |
705 if (this_oop->is_pseudo_string_at(index)) { | |
706 result_oop = this_oop->pseudo_string_at(index, cache_index); | |
707 break; | |
708 } | |
709 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); | |
710 break; | |
711 | |
712 case JVM_CONSTANT_Object: | |
713 result_oop = this_oop->object_at(index); | |
714 break; | |
715 | |
716 case JVM_CONSTANT_MethodHandleInError: | |
717 case JVM_CONSTANT_MethodTypeInError: | |
718 { | |
719 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); | |
720 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); | |
721 ResourceMark rm; | |
722 THROW_MSG_0(error, ""); | |
723 break; | |
724 } | |
725 | |
726 case JVM_CONSTANT_MethodHandle: | |
727 { | |
728 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
729 int callee_index = this_oop->method_handle_klass_index_at(index); | |
730 Symbol* name = this_oop->method_handle_name_ref_at(index); | |
731 Symbol* signature = this_oop->method_handle_signature_ref_at(index); | |
732 if (PrintMiscellaneous) | |
733 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
734 ref_kind, index, this_oop->method_handle_index_at(index), | |
735 callee_index, name->as_C_string(), signature->as_C_string()); | |
736 KlassHandle callee; | |
737 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); | |
738 callee = KlassHandle(THREAD, k); | |
739 } | |
740 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
741 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
742 callee, name, signature, | |
743 THREAD); | |
744 result_oop = value(); | |
745 if (HAS_PENDING_EXCEPTION) { | |
746 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); | |
747 } | |
748 break; | |
749 } | |
750 | |
751 case JVM_CONSTANT_MethodType: | |
752 { | |
753 Symbol* signature = this_oop->method_type_signature_at(index); | |
754 if (PrintMiscellaneous) | |
755 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
756 index, this_oop->method_type_index_at(index), | |
757 signature->as_C_string()); | |
758 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
759 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); | |
760 result_oop = value(); | |
761 if (HAS_PENDING_EXCEPTION) { | |
762 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); | |
763 } | |
764 break; | |
765 } | |
766 | |
767 case JVM_CONSTANT_Integer: | |
768 assert(cache_index == _no_index_sentinel, "should not have been set"); | |
769 prim_value.i = this_oop->int_at(index); | |
770 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); | |
771 break; | |
772 | |
773 case JVM_CONSTANT_Float: | |
774 assert(cache_index == _no_index_sentinel, "should not have been set"); | |
775 prim_value.f = this_oop->float_at(index); | |
776 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); | |
777 break; | |
778 | |
779 case JVM_CONSTANT_Long: | |
780 assert(cache_index == _no_index_sentinel, "should not have been set"); | |
781 prim_value.j = this_oop->long_at(index); | |
782 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); | |
783 break; | |
784 | |
785 case JVM_CONSTANT_Double: | |
786 assert(cache_index == _no_index_sentinel, "should not have been set"); | |
787 prim_value.d = this_oop->double_at(index); | |
788 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); | |
789 break; | |
790 | |
791 default: | |
792 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
793 this_oop(), index, cache_index, tag_value) ); | |
794 assert(false, "unexpected constant tag"); | |
795 break; | |
796 } | |
797 | |
798 if (cache_index >= 0) { | |
799 // Cache the oop here also. | |
800 Handle result_handle(THREAD, result_oop); | |
801 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this | |
802 oop result = this_oop->resolved_references()->obj_at(cache_index); | |
803 // Benign race condition: resolved_references may already be filled in while we were trying to lock. | |
804 // The important thing here is that all threads pick up the same result. | |
805 // It doesn't matter which racing thread wins, as long as only one | |
806 // result is used by all threads, and all future queries. | |
807 // That result may be either a resolved constant or a failure exception. | |
808 if (result == NULL) { | |
809 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); | |
810 return result_handle(); | |
811 } else { | |
812 // Return the winning thread's result. This can be different than | |
813 // result_handle() for MethodHandles. | |
814 return result; | |
815 } | |
816 } else { | |
817 return result_oop; | |
818 } | |
819 } | |
820 | |
821 oop ConstantPool::uncached_string_at(int which, TRAPS) { | |
822 Symbol* sym = unresolved_string_at(which); | |
823 oop str = StringTable::intern(sym, CHECK_(NULL)); | |
824 assert(java_lang_String::is_instance(str), "must be string"); | |
825 return str; | |
826 } | |
827 | |
828 | |
829 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { | |
830 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); | |
831 | |
832 Handle bsm; | |
833 int argc; | |
834 { | |
835 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments | |
836 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. | |
837 // It is accompanied by the optional arguments. | |
838 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); | |
839 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); | |
840 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { | |
841 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); | |
842 } | |
843 | |
844 // Extract the optional static arguments. | |
845 argc = this_oop->invoke_dynamic_argument_count_at(index); | |
846 if (argc == 0) return bsm_oop; | |
847 | |
848 bsm = Handle(THREAD, bsm_oop); | |
849 } | |
850 | |
851 objArrayHandle info; | |
852 { | |
853 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); | |
854 info = objArrayHandle(THREAD, info_oop); | |
855 } | |
856 | |
857 info->obj_at_put(0, bsm()); | |
858 for (int i = 0; i < argc; i++) { | |
859 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); | |
860 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); | |
861 info->obj_at_put(1+i, arg_oop); | |
862 } | |
863 | |
864 return info(); | |
865 } | |
866 | |
867 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { | |
868 // If the string has already been interned, this entry will be non-null | |
869 oop str = this_oop->resolved_references()->obj_at(obj_index); | |
870 if (str != NULL) return str; | |
871 | |
872 Symbol* sym = this_oop->unresolved_string_at(which); | |
873 str = StringTable::intern(sym, CHECK_(NULL)); | |
874 this_oop->string_at_put(which, obj_index, str); | |
875 assert(java_lang_String::is_instance(str), "must be string"); | |
876 return str; | |
877 } | |
878 | |
879 | |
880 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, | |
881 int which) { | |
882 // Names are interned, so we can compare Symbol*s directly | |
883 Symbol* cp_name = klass_name_at(which); | |
884 return (cp_name == k->name()); | |
885 } | |
886 | |
887 | |
888 // Iterate over symbols and decrement ones which are Symbol*s. | |
889 // This is done during GC so do not need to lock constantPool unless we | |
890 // have per-thread safepoints. | |
891 // Only decrement the UTF8 symbols. Unresolved classes and strings point to | |
892 // these symbols but didn't increment the reference count. | |
893 void ConstantPool::unreference_symbols() { | |
894 for (int index = 1; index < length(); index++) { // Index 0 is unused | |
895 constantTag tag = tag_at(index); | |
896 if (tag.is_symbol()) { | |
897 symbol_at(index)->decrement_refcount(); | |
898 } | |
899 } | |
900 } | |
901 | |
902 | |
903 // Compare this constant pool's entry at index1 to the constant pool | |
904 // cp2's entry at index2. | |
905 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, | |
906 int index2, TRAPS) { | |
907 | |
908 jbyte t1 = tag_at(index1).value(); | |
909 jbyte t2 = cp2->tag_at(index2).value(); | |
910 | |
911 | |
912 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
913 // when comparing | |
914 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
915 t1 = JVM_CONSTANT_UnresolvedClass; | |
916 } | |
917 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
918 t2 = JVM_CONSTANT_UnresolvedClass; | |
919 } | |
920 | |
921 if (t1 != t2) { | |
922 // Not the same entry type so there is nothing else to check. Note | |
923 // that this style of checking will consider resolved/unresolved | |
924 // class pairs as different. | |
925 // From the ConstantPool* API point of view, this is correct | |
926 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this | |
927 // plays out in the context of ConstantPool* merging. | |
928 return false; | |
929 } | |
930 | |
931 switch (t1) { | |
932 case JVM_CONSTANT_Class: | |
933 { | |
934 Klass* k1 = klass_at(index1, CHECK_false); | |
935 Klass* k2 = cp2->klass_at(index2, CHECK_false); | |
936 if (k1 == k2) { | |
937 return true; | |
938 } | |
939 } break; | |
940 | |
941 case JVM_CONSTANT_ClassIndex: | |
942 { | |
943 int recur1 = klass_index_at(index1); | |
944 int recur2 = cp2->klass_index_at(index2); | |
945 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
946 if (match) { | |
947 return true; | |
948 } | |
949 } break; | |
950 | |
951 case JVM_CONSTANT_Double: | |
952 { | |
953 jdouble d1 = double_at(index1); | |
954 jdouble d2 = cp2->double_at(index2); | |
955 if (d1 == d2) { | |
956 return true; | |
957 } | |
958 } break; | |
959 | |
960 case JVM_CONSTANT_Fieldref: | |
961 case JVM_CONSTANT_InterfaceMethodref: | |
962 case JVM_CONSTANT_Methodref: | |
963 { | |
964 int recur1 = uncached_klass_ref_index_at(index1); | |
965 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
966 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
967 if (match) { | |
968 recur1 = uncached_name_and_type_ref_index_at(index1); | |
969 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
970 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
971 if (match) { | |
972 return true; | |
973 } | |
974 } | |
975 } break; | |
976 | |
977 case JVM_CONSTANT_Float: | |
978 { | |
979 jfloat f1 = float_at(index1); | |
980 jfloat f2 = cp2->float_at(index2); | |
981 if (f1 == f2) { | |
982 return true; | |
983 } | |
984 } break; | |
985 | |
986 case JVM_CONSTANT_Integer: | |
987 { | |
988 jint i1 = int_at(index1); | |
989 jint i2 = cp2->int_at(index2); | |
990 if (i1 == i2) { | |
991 return true; | |
992 } | |
993 } break; | |
994 | |
995 case JVM_CONSTANT_Long: | |
996 { | |
997 jlong l1 = long_at(index1); | |
998 jlong l2 = cp2->long_at(index2); | |
999 if (l1 == l2) { | |
1000 return true; | |
1001 } | |
1002 } break; | |
1003 | |
1004 case JVM_CONSTANT_NameAndType: | |
1005 { | |
1006 int recur1 = name_ref_index_at(index1); | |
1007 int recur2 = cp2->name_ref_index_at(index2); | |
1008 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1009 if (match) { | |
1010 recur1 = signature_ref_index_at(index1); | |
1011 recur2 = cp2->signature_ref_index_at(index2); | |
1012 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1013 if (match) { | |
1014 return true; | |
1015 } | |
1016 } | |
1017 } break; | |
1018 | |
1019 case JVM_CONSTANT_StringIndex: | |
1020 { | |
1021 int recur1 = string_index_at(index1); | |
1022 int recur2 = cp2->string_index_at(index2); | |
1023 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1024 if (match) { | |
1025 return true; | |
1026 } | |
1027 } break; | |
1028 | |
1029 case JVM_CONSTANT_UnresolvedClass: | |
1030 { | |
1031 Symbol* k1 = unresolved_klass_at(index1); | |
1032 Symbol* k2 = cp2->unresolved_klass_at(index2); | |
1033 if (k1 == k2) { | |
1034 return true; | |
1035 } | |
1036 } break; | |
1037 | |
1038 case JVM_CONSTANT_MethodType: | |
1039 { | |
1040 int k1 = method_type_index_at(index1); | |
1041 int k2 = cp2->method_type_index_at(index2); | |
1042 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1043 if (match) { | |
1044 return true; | |
1045 } | |
1046 } break; | |
1047 | |
1048 case JVM_CONSTANT_MethodHandle: | |
1049 { | |
1050 int k1 = method_handle_ref_kind_at(index1); | |
1051 int k2 = cp2->method_handle_ref_kind_at(index2); | |
1052 if (k1 == k2) { | |
1053 int i1 = method_handle_index_at(index1); | |
1054 int i2 = cp2->method_handle_index_at(index2); | |
1055 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); | |
1056 if (match) { | |
1057 return true; | |
1058 } | |
1059 } | |
1060 } break; | |
1061 | |
1062 case JVM_CONSTANT_InvokeDynamic: | |
1063 { | |
1064 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1); | |
1065 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2); | |
1066 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1067 if (!match) return false; | |
1068 k1 = invoke_dynamic_name_and_type_ref_index_at(index1); | |
1069 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); | |
1070 match = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1071 if (!match) return false; | |
1072 int argc = invoke_dynamic_argument_count_at(index1); | |
1073 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) { | |
1074 for (int j = 0; j < argc; j++) { | |
1075 k1 = invoke_dynamic_argument_index_at(index1, j); | |
1076 k2 = cp2->invoke_dynamic_argument_index_at(index2, j); | |
1077 match = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1078 if (!match) return false; | |
1079 } | |
1080 return true; // got through loop; all elements equal | |
1081 } | |
1082 } break; | |
1083 | |
1084 case JVM_CONSTANT_String: | |
1085 { | |
1086 Symbol* s1 = unresolved_string_at(index1); | |
1087 Symbol* s2 = cp2->unresolved_string_at(index2); | |
1088 if (s1 == s2) { | |
1089 return true; | |
1090 } | |
1091 } break; | |
1092 | |
1093 case JVM_CONSTANT_Utf8: | |
1094 { | |
1095 Symbol* s1 = symbol_at(index1); | |
1096 Symbol* s2 = cp2->symbol_at(index2); | |
1097 if (s1 == s2) { | |
1098 return true; | |
1099 } | |
1100 } break; | |
1101 | |
1102 // Invalid is used as the tag for the second constant pool entry | |
1103 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1104 // not be seen by itself. | |
1105 case JVM_CONSTANT_Invalid: // fall through | |
1106 | |
1107 default: | |
1108 ShouldNotReachHere(); | |
1109 break; | |
1110 } | |
1111 | |
1112 return false; | |
1113 } // end compare_entry_to() | |
1114 | |
1115 | |
1116 // Copy this constant pool's entries at start_i to end_i (inclusive) | |
1117 // to the constant pool to_cp's entries starting at to_i. A total of | |
1118 // (end_i - start_i) + 1 entries are copied. | |
1119 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, | |
1120 constantPoolHandle to_cp, int to_i, TRAPS) { | |
1121 | |
1122 int dest_i = to_i; // leave original alone for debug purposes | |
1123 | |
1124 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { | |
1125 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); | |
1126 | |
1127 switch (from_cp->tag_at(src_i).value()) { | |
1128 case JVM_CONSTANT_Double: | |
1129 case JVM_CONSTANT_Long: | |
1130 // double and long take two constant pool entries | |
1131 src_i += 2; | |
1132 dest_i += 2; | |
1133 break; | |
1134 | |
1135 default: | |
1136 // all others take one constant pool entry | |
1137 src_i++; | |
1138 dest_i++; | |
1139 break; | |
1140 } | |
1141 } | |
1142 | |
1143 int from_oplen = operand_array_length(from_cp->operands()); | |
1144 int old_oplen = operand_array_length(to_cp->operands()); | |
1145 if (from_oplen != 0) { | |
1146 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); | |
1147 // append my operands to the target's operands array | |
1148 if (old_oplen == 0) { | |
1149 // Can't just reuse from_cp's operand list because of deallocation issues | |
1150 int len = from_cp->operands()->length(); | |
1151 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1152 Copy::conjoint_memory_atomic( | |
1153 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1154 to_cp->set_operands(new_ops); | |
1155 } else { | |
1156 int old_len = to_cp->operands()->length(); | |
1157 int from_len = from_cp->operands()->length(); | |
1158 int old_off = old_oplen * sizeof(u2); | |
1159 int from_off = from_oplen * sizeof(u2); | |
1160 // Use the metaspace for the destination constant pool | |
1161 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); | |
1162 int fillp = 0, len = 0; | |
1163 // first part of dest | |
1164 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), | |
1165 new_operands->adr_at(fillp), | |
1166 (len = old_off) * sizeof(u2)); | |
1167 fillp += len; | |
1168 // first part of src | |
1169 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), | |
1170 new_operands->adr_at(fillp), | |
1171 (len = from_off) * sizeof(u2)); | |
1172 fillp += len; | |
1173 // second part of dest | |
1174 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), | |
1175 new_operands->adr_at(fillp), | |
1176 (len = old_len - old_off) * sizeof(u2)); | |
1177 fillp += len; | |
1178 // second part of src | |
1179 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off), | |
1180 new_operands->adr_at(fillp), | |
1181 (len = from_len - from_off) * sizeof(u2)); | |
1182 fillp += len; | |
1183 assert(fillp == new_operands->length(), ""); | |
1184 | |
1185 // Adjust indexes in the first part of the copied operands array. | |
1186 for (int j = 0; j < from_oplen; j++) { | |
1187 int offset = operand_offset_at(new_operands, old_oplen + j); | |
1188 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); | |
1189 offset += old_len; // every new tuple is preceded by old_len extra u2's | |
1190 operand_offset_at_put(new_operands, old_oplen + j, offset); | |
1191 } | |
1192 | |
1193 // replace target operands array with combined array | |
1194 to_cp->set_operands(new_operands); | |
1195 } | |
1196 } | |
1197 | |
1198 } // end copy_cp_to() | |
1199 | |
1200 | |
1201 // Copy this constant pool's entry at from_i to the constant pool | |
1202 // to_cp's entry at to_i. | |
1203 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, | |
1204 constantPoolHandle to_cp, int to_i, | |
1205 TRAPS) { | |
1206 | |
1207 int tag = from_cp->tag_at(from_i).value(); | |
1208 switch (tag) { | |
1209 case JVM_CONSTANT_Class: | |
1210 { | |
1211 Klass* k = from_cp->klass_at(from_i, CHECK); | |
1212 to_cp->klass_at_put(to_i, k); | |
1213 } break; | |
1214 | |
1215 case JVM_CONSTANT_ClassIndex: | |
1216 { | |
1217 jint ki = from_cp->klass_index_at(from_i); | |
1218 to_cp->klass_index_at_put(to_i, ki); | |
1219 } break; | |
1220 | |
1221 case JVM_CONSTANT_Double: | |
1222 { | |
1223 jdouble d = from_cp->double_at(from_i); | |
1224 to_cp->double_at_put(to_i, d); | |
1225 // double takes two constant pool entries so init second entry's tag | |
1226 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1227 } break; | |
1228 | |
1229 case JVM_CONSTANT_Fieldref: | |
1230 { | |
1231 int class_index = from_cp->uncached_klass_ref_index_at(from_i); | |
1232 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); | |
1233 to_cp->field_at_put(to_i, class_index, name_and_type_index); | |
1234 } break; | |
1235 | |
1236 case JVM_CONSTANT_Float: | |
1237 { | |
1238 jfloat f = from_cp->float_at(from_i); | |
1239 to_cp->float_at_put(to_i, f); | |
1240 } break; | |
1241 | |
1242 case JVM_CONSTANT_Integer: | |
1243 { | |
1244 jint i = from_cp->int_at(from_i); | |
1245 to_cp->int_at_put(to_i, i); | |
1246 } break; | |
1247 | |
1248 case JVM_CONSTANT_InterfaceMethodref: | |
1249 { | |
1250 int class_index = from_cp->uncached_klass_ref_index_at(from_i); | |
1251 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); | |
1252 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); | |
1253 } break; | |
1254 | |
1255 case JVM_CONSTANT_Long: | |
1256 { | |
1257 jlong l = from_cp->long_at(from_i); | |
1258 to_cp->long_at_put(to_i, l); | |
1259 // long takes two constant pool entries so init second entry's tag | |
1260 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1261 } break; | |
1262 | |
1263 case JVM_CONSTANT_Methodref: | |
1264 { | |
1265 int class_index = from_cp->uncached_klass_ref_index_at(from_i); | |
1266 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); | |
1267 to_cp->method_at_put(to_i, class_index, name_and_type_index); | |
1268 } break; | |
1269 | |
1270 case JVM_CONSTANT_NameAndType: | |
1271 { | |
1272 int name_ref_index = from_cp->name_ref_index_at(from_i); | |
1273 int signature_ref_index = from_cp->signature_ref_index_at(from_i); | |
1274 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); | |
1275 } break; | |
1276 | |
1277 case JVM_CONSTANT_StringIndex: | |
1278 { | |
1279 jint si = from_cp->string_index_at(from_i); | |
1280 to_cp->string_index_at_put(to_i, si); | |
1281 } break; | |
1282 | |
1283 case JVM_CONSTANT_UnresolvedClass: | |
1284 { | |
1285 // Can be resolved after checking tag, so check the slot first. | |
1286 CPSlot entry = from_cp->slot_at(from_i); | |
1287 if (entry.is_resolved()) { | |
1288 assert(entry.get_klass()->is_klass(), "must be"); | |
1289 // Already resolved | |
1290 to_cp->klass_at_put(to_i, entry.get_klass()); | |
1291 } else { | |
1292 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); | |
1293 } | |
1294 } break; | |
1295 | |
1296 case JVM_CONSTANT_UnresolvedClassInError: | |
1297 { | |
1298 Symbol* k = from_cp->unresolved_klass_at(from_i); | |
1299 to_cp->unresolved_klass_at_put(to_i, k); | |
1300 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1301 } break; | |
1302 | |
1303 | |
1304 case JVM_CONSTANT_String: | |
1305 { | |
1306 Symbol* s = from_cp->unresolved_string_at(from_i); | |
1307 to_cp->unresolved_string_at_put(to_i, s); | |
1308 } break; | |
1309 | |
1310 case JVM_CONSTANT_Utf8: | |
1311 { | |
1312 Symbol* s = from_cp->symbol_at(from_i); | |
1313 // Need to increase refcount, the old one will be thrown away and deferenced | |
1314 s->increment_refcount(); | |
1315 to_cp->symbol_at_put(to_i, s); | |
1316 } break; | |
1317 | |
1318 case JVM_CONSTANT_MethodType: | |
1319 { | |
1320 jint k = from_cp->method_type_index_at(from_i); | |
1321 to_cp->method_type_index_at_put(to_i, k); | |
1322 } break; | |
1323 | |
1324 case JVM_CONSTANT_MethodHandle: | |
1325 { | |
1326 int k1 = from_cp->method_handle_ref_kind_at(from_i); | |
1327 int k2 = from_cp->method_handle_index_at(from_i); | |
1328 to_cp->method_handle_index_at_put(to_i, k1, k2); | |
1329 } break; | |
1330 | |
1331 case JVM_CONSTANT_InvokeDynamic: | |
1332 { | |
1333 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); | |
1334 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); | |
1335 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands | |
1336 to_cp->invoke_dynamic_at_put(to_i, k1, k2); | |
1337 } break; | |
1338 | |
1339 // Invalid is used as the tag for the second constant pool entry | |
1340 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1341 // not be seen by itself. | |
1342 case JVM_CONSTANT_Invalid: // fall through | |
1343 | |
1344 default: | |
1345 { | |
1346 ShouldNotReachHere(); | |
1347 } break; | |
1348 } | |
1349 } // end copy_entry_to() | |
1350 | |
1351 | |
1352 // Search constant pool search_cp for an entry that matches this | |
1353 // constant pool's entry at pattern_i. Returns the index of a | |
1354 // matching entry or zero (0) if there is no matching entry. | |
1355 int ConstantPool::find_matching_entry(int pattern_i, | |
1356 constantPoolHandle search_cp, TRAPS) { | |
1357 | |
1358 // index zero (0) is not used | |
1359 for (int i = 1; i < search_cp->length(); i++) { | |
1360 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1361 if (found) { | |
1362 return i; | |
1363 } | |
1364 } | |
1365 | |
1366 return 0; // entry not found; return unused index zero (0) | |
1367 } // end find_matching_entry() | |
1368 | |
1369 | |
1370 #ifndef PRODUCT | |
1371 | |
1372 const char* ConstantPool::printable_name_at(int which) { | |
1373 | |
1374 constantTag tag = tag_at(which); | |
1375 | |
1376 if (tag.is_string()) { | |
1377 return string_at_noresolve(which); | |
1378 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1379 return klass_name_at(which)->as_C_string(); | |
1380 } else if (tag.is_symbol()) { | |
1381 return symbol_at(which)->as_C_string(); | |
1382 } | |
1383 return ""; | |
1384 } | |
1385 | |
1386 #endif // PRODUCT | |
1387 | |
1388 | |
1389 // JVMTI GetConstantPool support | |
1390 | |
1391 // For temporary use until code is stable. | |
1392 #define DBG(code) | |
1393 | |
1394 static const char* WARN_MSG = "Must not be such entry!"; | |
1395 | |
1396 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
1397 jint size = 0; | |
1398 u2 idx1, idx2; | |
1399 | |
1400 for (jint idx = 1; idx < cnt; idx++) { | |
1401 jint ent_size = 0; | |
1402 u1 tag = *bytes++; | |
1403 size++; // count tag | |
1404 | |
1405 printf("const #%03d, tag: %02d ", idx, tag); | |
1406 switch(tag) { | |
1407 case JVM_CONSTANT_Invalid: { | |
1408 printf("Invalid"); | |
1409 break; | |
1410 } | |
1411 case JVM_CONSTANT_Unicode: { | |
1412 printf("Unicode %s", WARN_MSG); | |
1413 break; | |
1414 } | |
1415 case JVM_CONSTANT_Utf8: { | |
1416 u2 len = Bytes::get_Java_u2(bytes); | |
1417 char str[128]; | |
1418 if (len > 127) { | |
1419 len = 127; | |
1420 } | |
1421 strncpy(str, (char *) (bytes+2), len); | |
1422 str[len] = '\0'; | |
1423 printf("Utf8 \"%s\"", str); | |
1424 ent_size = 2 + len; | |
1425 break; | |
1426 } | |
1427 case JVM_CONSTANT_Integer: { | |
1428 u4 val = Bytes::get_Java_u4(bytes); | |
1429 printf("int %d", *(int *) &val); | |
1430 ent_size = 4; | |
1431 break; | |
1432 } | |
1433 case JVM_CONSTANT_Float: { | |
1434 u4 val = Bytes::get_Java_u4(bytes); | |
1435 printf("float %5.3ff", *(float *) &val); | |
1436 ent_size = 4; | |
1437 break; | |
1438 } | |
1439 case JVM_CONSTANT_Long: { | |
1440 u8 val = Bytes::get_Java_u8(bytes); | |
1441 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); | |
1442 ent_size = 8; | |
1443 idx++; // Long takes two cpool slots | |
1444 break; | |
1445 } | |
1446 case JVM_CONSTANT_Double: { | |
1447 u8 val = Bytes::get_Java_u8(bytes); | |
1448 printf("double %5.3fd", *(jdouble *)&val); | |
1449 ent_size = 8; | |
1450 idx++; // Double takes two cpool slots | |
1451 break; | |
1452 } | |
1453 case JVM_CONSTANT_Class: { | |
1454 idx1 = Bytes::get_Java_u2(bytes); | |
1455 printf("class #%03d", idx1); | |
1456 ent_size = 2; | |
1457 break; | |
1458 } | |
1459 case JVM_CONSTANT_String: { | |
1460 idx1 = Bytes::get_Java_u2(bytes); | |
1461 printf("String #%03d", idx1); | |
1462 ent_size = 2; | |
1463 break; | |
1464 } | |
1465 case JVM_CONSTANT_Fieldref: { | |
1466 idx1 = Bytes::get_Java_u2(bytes); | |
1467 idx2 = Bytes::get_Java_u2(bytes+2); | |
1468 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1469 ent_size = 4; | |
1470 break; | |
1471 } | |
1472 case JVM_CONSTANT_Methodref: { | |
1473 idx1 = Bytes::get_Java_u2(bytes); | |
1474 idx2 = Bytes::get_Java_u2(bytes+2); | |
1475 printf("Method #%03d, #%03d", idx1, idx2); | |
1476 ent_size = 4; | |
1477 break; | |
1478 } | |
1479 case JVM_CONSTANT_InterfaceMethodref: { | |
1480 idx1 = Bytes::get_Java_u2(bytes); | |
1481 idx2 = Bytes::get_Java_u2(bytes+2); | |
1482 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1483 ent_size = 4; | |
1484 break; | |
1485 } | |
1486 case JVM_CONSTANT_NameAndType: { | |
1487 idx1 = Bytes::get_Java_u2(bytes); | |
1488 idx2 = Bytes::get_Java_u2(bytes+2); | |
1489 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1490 ent_size = 4; | |
1491 break; | |
1492 } | |
1493 case JVM_CONSTANT_ClassIndex: { | |
1494 printf("ClassIndex %s", WARN_MSG); | |
1495 break; | |
1496 } | |
1497 case JVM_CONSTANT_UnresolvedClass: { | |
1498 printf("UnresolvedClass: %s", WARN_MSG); | |
1499 break; | |
1500 } | |
1501 case JVM_CONSTANT_UnresolvedClassInError: { | |
1502 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1503 break; | |
1504 } | |
1505 case JVM_CONSTANT_StringIndex: { | |
1506 printf("StringIndex: %s", WARN_MSG); | |
1507 break; | |
1508 } | |
1509 } | |
1510 printf(";\n"); | |
1511 bytes += ent_size; | |
1512 size += ent_size; | |
1513 } | |
1514 printf("Cpool size: %d\n", size); | |
1515 fflush(0); | |
1516 return; | |
1517 } /* end print_cpool_bytes */ | |
1518 | |
1519 | |
1520 // Returns size of constant pool entry. | |
1521 jint ConstantPool::cpool_entry_size(jint idx) { | |
1522 switch(tag_at(idx).value()) { | |
1523 case JVM_CONSTANT_Invalid: | |
1524 case JVM_CONSTANT_Unicode: | |
1525 return 1; | |
1526 | |
1527 case JVM_CONSTANT_Utf8: | |
1528 return 3 + symbol_at(idx)->utf8_length(); | |
1529 | |
1530 case JVM_CONSTANT_Class: | |
1531 case JVM_CONSTANT_String: | |
1532 case JVM_CONSTANT_ClassIndex: | |
1533 case JVM_CONSTANT_UnresolvedClass: | |
1534 case JVM_CONSTANT_UnresolvedClassInError: | |
1535 case JVM_CONSTANT_StringIndex: | |
1536 case JVM_CONSTANT_MethodType: | |
1537 return 3; | |
1538 | |
1539 case JVM_CONSTANT_MethodHandle: | |
1540 return 4; //tag, ref_kind, ref_index | |
1541 | |
1542 case JVM_CONSTANT_Integer: | |
1543 case JVM_CONSTANT_Float: | |
1544 case JVM_CONSTANT_Fieldref: | |
1545 case JVM_CONSTANT_Methodref: | |
1546 case JVM_CONSTANT_InterfaceMethodref: | |
1547 case JVM_CONSTANT_NameAndType: | |
1548 return 5; | |
1549 | |
1550 case JVM_CONSTANT_InvokeDynamic: | |
1551 // u1 tag, u2 bsm, u2 nt | |
1552 return 5; | |
1553 | |
1554 case JVM_CONSTANT_Long: | |
1555 case JVM_CONSTANT_Double: | |
1556 return 9; | |
1557 } | |
1558 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1559 return 1; | |
1560 } /* end cpool_entry_size */ | |
1561 | |
1562 | |
1563 // SymbolHashMap is used to find a constant pool index from a string. | |
1564 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1565 // class names, returns size of the cpool raw bytes. | |
1566 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, | |
1567 SymbolHashMap *classmap) { | |
1568 jint size = 0; | |
1569 | |
1570 for (u2 idx = 1; idx < length(); idx++) { | |
1571 u2 tag = tag_at(idx).value(); | |
1572 size += cpool_entry_size(idx); | |
1573 | |
1574 switch(tag) { | |
1575 case JVM_CONSTANT_Utf8: { | |
1576 Symbol* sym = symbol_at(idx); | |
1577 symmap->add_entry(sym, idx); | |
1578 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1579 break; | |
1580 } | |
1581 case JVM_CONSTANT_Class: | |
1582 case JVM_CONSTANT_UnresolvedClass: | |
1583 case JVM_CONSTANT_UnresolvedClassInError: { | |
1584 Symbol* sym = klass_name_at(idx); | |
1585 classmap->add_entry(sym, idx); | |
1586 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1587 break; | |
1588 } | |
1589 case JVM_CONSTANT_Long: | |
1590 case JVM_CONSTANT_Double: { | |
1591 idx++; // Both Long and Double take two cpool slots | |
1592 break; | |
1593 } | |
1594 } | |
1595 } | |
1596 return size; | |
1597 } /* end hash_utf8_entries_to */ | |
1598 | |
1599 | |
1600 // Copy cpool bytes. | |
1601 // Returns: | |
1602 // 0, in case of OutOfMemoryError | |
1603 // -1, in case of internal error | |
1604 // > 0, count of the raw cpool bytes that have been copied | |
1605 int ConstantPool::copy_cpool_bytes(int cpool_size, | |
1606 SymbolHashMap* tbl, | |
1607 unsigned char *bytes) { | |
1608 u2 idx1, idx2; | |
1609 jint size = 0; | |
1610 jint cnt = length(); | |
1611 unsigned char *start_bytes = bytes; | |
1612 | |
1613 for (jint idx = 1; idx < cnt; idx++) { | |
1614 u1 tag = tag_at(idx).value(); | |
1615 jint ent_size = cpool_entry_size(idx); | |
1616 | |
1617 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1618 | |
1619 *bytes = tag; | |
1620 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1621 switch(tag) { | |
1622 case JVM_CONSTANT_Invalid: { | |
1623 DBG(printf("JVM_CONSTANT_Invalid")); | |
1624 break; | |
1625 } | |
1626 case JVM_CONSTANT_Unicode: { | |
1627 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1628 DBG(printf("JVM_CONSTANT_Unicode")); | |
1629 break; | |
1630 } | |
1631 case JVM_CONSTANT_Utf8: { | |
1632 Symbol* sym = symbol_at(idx); | |
1633 char* str = sym->as_utf8(); | |
1634 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1635 int len = (int) strlen(str); | |
1636 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1637 for (int i = 0; i < len; i++) { | |
1638 bytes[3+i] = (u1) str[i]; | |
1639 } | |
1640 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1641 break; | |
1642 } | |
1643 case JVM_CONSTANT_Integer: { | |
1644 jint val = int_at(idx); | |
1645 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1646 break; | |
1647 } | |
1648 case JVM_CONSTANT_Float: { | |
1649 jfloat val = float_at(idx); | |
1650 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1651 break; | |
1652 } | |
1653 case JVM_CONSTANT_Long: { | |
1654 jlong val = long_at(idx); | |
1655 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1656 idx++; // Long takes two cpool slots | |
1657 break; | |
1658 } | |
1659 case JVM_CONSTANT_Double: { | |
1660 jdouble val = double_at(idx); | |
1661 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1662 idx++; // Double takes two cpool slots | |
1663 break; | |
1664 } | |
1665 case JVM_CONSTANT_Class: | |
1666 case JVM_CONSTANT_UnresolvedClass: | |
1667 case JVM_CONSTANT_UnresolvedClassInError: { | |
1668 *bytes = JVM_CONSTANT_Class; | |
1669 Symbol* sym = klass_name_at(idx); | |
1670 idx1 = tbl->symbol_to_value(sym); | |
1671 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1672 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1673 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1674 break; | |
1675 } | |
1676 case JVM_CONSTANT_String: { | |
1677 *bytes = JVM_CONSTANT_String; | |
1678 Symbol* sym = unresolved_string_at(idx); | |
1679 idx1 = tbl->symbol_to_value(sym); | |
1680 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1681 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1682 DBG(char *str = sym->as_utf8()); | |
1683 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str)); | |
1684 break; | |
1685 } | |
1686 case JVM_CONSTANT_Fieldref: | |
1687 case JVM_CONSTANT_Methodref: | |
1688 case JVM_CONSTANT_InterfaceMethodref: { | |
1689 idx1 = uncached_klass_ref_index_at(idx); | |
1690 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1691 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1692 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1693 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1694 break; | |
1695 } | |
1696 case JVM_CONSTANT_NameAndType: { | |
1697 idx1 = name_ref_index_at(idx); | |
1698 idx2 = signature_ref_index_at(idx); | |
1699 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1700 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1701 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1702 break; | |
1703 } | |
1704 case JVM_CONSTANT_ClassIndex: { | |
1705 *bytes = JVM_CONSTANT_Class; | |
1706 idx1 = klass_index_at(idx); | |
1707 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1708 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1709 break; | |
1710 } | |
1711 case JVM_CONSTANT_StringIndex: { | |
1712 *bytes = JVM_CONSTANT_String; | |
1713 idx1 = string_index_at(idx); | |
1714 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1715 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1716 break; | |
1717 } | |
1718 case JVM_CONSTANT_MethodHandle: | |
1719 case JVM_CONSTANT_MethodHandleInError: { | |
1720 *bytes = JVM_CONSTANT_MethodHandle; | |
1721 int kind = method_handle_ref_kind_at(idx); | |
1722 idx1 = method_handle_index_at(idx); | |
1723 *(bytes+1) = (unsigned char) kind; | |
1724 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1725 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1726 break; | |
1727 } | |
1728 case JVM_CONSTANT_MethodType: | |
1729 case JVM_CONSTANT_MethodTypeInError: { | |
1730 *bytes = JVM_CONSTANT_MethodType; | |
1731 idx1 = method_type_index_at(idx); | |
1732 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1733 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1734 break; | |
1735 } | |
1736 case JVM_CONSTANT_InvokeDynamic: { | |
1737 *bytes = tag; | |
1738 idx1 = extract_low_short_from_int(*int_at_addr(idx)); | |
1739 idx2 = extract_high_short_from_int(*int_at_addr(idx)); | |
1740 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); | |
1741 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1742 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1743 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); | |
1744 break; | |
1745 } | |
1746 } | |
1747 DBG(printf("\n")); | |
1748 bytes += ent_size; | |
1749 size += ent_size; | |
1750 } | |
1751 assert(size == cpool_size, "Size mismatch"); | |
1752 | |
1753 // Keep temorarily for debugging until it's stable. | |
1754 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1755 return (int)(bytes - start_bytes); | |
1756 } /* end copy_cpool_bytes */ | |
1757 | |
1758 | |
1759 void ConstantPool::set_on_stack(const bool value) { | |
1760 _on_stack = value; | |
1761 if (value) MetadataOnStackMark::record(this); | |
1762 } | |
1763 | |
1764 // JSR 292 support for patching constant pool oops after the class is linked and | |
1765 // the oop array for resolved references are created. | |
1766 // We can't do this during classfile parsing, which is how the other indexes are | |
1767 // patched. The other patches are applied early for some error checking | |
1768 // so only defer the pseudo_strings. | |
1769 void ConstantPool::patch_resolved_references( | |
1770 GrowableArray<Handle>* cp_patches) { | |
1771 assert(EnableInvokeDynamic, ""); | |
1772 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused | |
1773 Handle patch = cp_patches->at(index); | |
1774 if (patch.not_null()) { | |
1775 assert (tag_at(index).is_string(), "should only be string left"); | |
1776 // Patching a string means pre-resolving it. | |
1777 // The spelling in the constant pool is ignored. | |
1778 // The constant reference may be any object whatever. | |
1779 // If it is not a real interned string, the constant is referred | |
1780 // to as a "pseudo-string", and must be presented to the CP | |
1781 // explicitly, because it may require scavenging. | |
1782 int obj_index = cp_to_object_index(index); | |
1783 pseudo_string_at_put(index, obj_index, patch()); | |
1784 DEBUG_ONLY(cp_patches->at_put(index, Handle());) | |
1785 } | |
1786 } | |
1787 #ifdef ASSERT | |
1788 // Ensure that all the patches have been used. | |
1789 for (int index = 0; index < cp_patches->length(); index++) { | |
1790 assert(cp_patches->at(index).is_null(), | |
1791 err_msg("Unused constant pool patch at %d in class file %s", | |
1792 index, | |
1793 pool_holder()->external_name())); | |
1794 } | |
1795 #endif // ASSERT | |
1796 } | |
1797 | |
1798 #ifndef PRODUCT | |
1799 | |
1800 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool | |
1801 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { | |
1802 guarantee(obj->is_constantPool(), "object must be constant pool"); | |
1803 constantPoolHandle cp(THREAD, (ConstantPool*)obj); | |
1804 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); | |
1805 | |
1806 for (int i = 0; i< cp->length(); i++) { | |
1807 if (cp->tag_at(i).is_unresolved_klass()) { | |
1808 // This will force loading of the class | |
1809 Klass* klass = cp->klass_at(i, CHECK); | |
1810 if (klass->oop_is_instance()) { | |
1811 // Force initialization of class | |
1812 InstanceKlass::cast(klass)->initialize(CHECK); | |
1813 } | |
1814 } | |
1815 } | |
1816 } | |
1817 | |
1818 #endif | |
1819 | |
1820 | |
1821 // Printing | |
1822 | |
1823 void ConstantPool::print_on(outputStream* st) const { | |
1824 EXCEPTION_MARK; | |
1825 assert(is_constantPool(), "must be constantPool"); | |
1826 st->print_cr(internal_name()); | |
1827 if (flags() != 0) { | |
1828 st->print(" - flags: 0x%x", flags()); | |
1829 if (has_pseudo_string()) st->print(" has_pseudo_string"); | |
1830 if (has_invokedynamic()) st->print(" has_invokedynamic"); | |
1831 if (has_preresolution()) st->print(" has_preresolution"); | |
1832 st->cr(); | |
1833 } | |
1834 if (pool_holder() != NULL) { | |
1835 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); | |
1836 } | |
1837 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); | |
1838 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); | |
1839 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); | |
1840 | |
1841 for (int index = 1; index < length(); index++) { // Index 0 is unused | |
1842 ((ConstantPool*)this)->print_entry_on(index, st); | |
1843 switch (tag_at(index).value()) { | |
1844 case JVM_CONSTANT_Long : | |
1845 case JVM_CONSTANT_Double : | |
1846 index++; // Skip entry following eigth-byte constant | |
1847 } | |
1848 | |
1849 } | |
1850 st->cr(); | |
1851 } | |
1852 | |
1853 // Print one constant pool entry | |
1854 void ConstantPool::print_entry_on(const int index, outputStream* st) { | |
1855 EXCEPTION_MARK; | |
1856 st->print(" - %3d : ", index); | |
1857 tag_at(index).print_on(st); | |
1858 st->print(" : "); | |
1859 switch (tag_at(index).value()) { | |
1860 case JVM_CONSTANT_Class : | |
1861 { Klass* k = klass_at(index, CATCH); | |
1862 k->print_value_on(st); | |
1863 st->print(" {0x%lx}", (address)k); | |
1864 } | |
1865 break; | |
1866 case JVM_CONSTANT_Fieldref : | |
1867 case JVM_CONSTANT_Methodref : | |
1868 case JVM_CONSTANT_InterfaceMethodref : | |
1869 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); | |
1870 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); | |
1871 break; | |
1872 case JVM_CONSTANT_String : | |
1873 unresolved_string_at(index)->print_value_on(st); | |
1874 break; | |
1875 case JVM_CONSTANT_Object : { | |
1876 oop anObj = object_at(index); | |
1877 anObj->print_value_on(st); | |
1878 st->print(" {0x%lx}", (address)anObj); | |
1879 } break; | |
1880 case JVM_CONSTANT_Integer : | |
1881 st->print("%d", int_at(index)); | |
1882 break; | |
1883 case JVM_CONSTANT_Float : | |
1884 st->print("%f", float_at(index)); | |
1885 break; | |
1886 case JVM_CONSTANT_Long : | |
1887 st->print_jlong(long_at(index)); | |
1888 break; | |
1889 case JVM_CONSTANT_Double : | |
1890 st->print("%lf", double_at(index)); | |
1891 break; | |
1892 case JVM_CONSTANT_NameAndType : | |
1893 st->print("name_index=%d", name_ref_index_at(index)); | |
1894 st->print(" signature_index=%d", signature_ref_index_at(index)); | |
1895 break; | |
1896 case JVM_CONSTANT_Utf8 : | |
1897 symbol_at(index)->print_value_on(st); | |
1898 break; | |
1899 case JVM_CONSTANT_UnresolvedClass : // fall-through | |
1900 case JVM_CONSTANT_UnresolvedClassInError: { | |
1901 // unresolved_klass_at requires lock or safe world. | |
1902 CPSlot entry = slot_at(index); | |
1903 if (entry.is_resolved()) { | |
1904 entry.get_klass()->print_value_on(st); | |
1905 } else { | |
1906 entry.get_symbol()->print_value_on(st); | |
1907 } | |
1908 } | |
1909 break; | |
1910 case JVM_CONSTANT_MethodHandle : | |
1911 case JVM_CONSTANT_MethodHandleInError : | |
1912 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); | |
1913 st->print(" ref_index=%d", method_handle_index_at(index)); | |
1914 break; | |
1915 case JVM_CONSTANT_MethodType : | |
1916 case JVM_CONSTANT_MethodTypeInError : | |
1917 st->print("signature_index=%d", method_type_index_at(index)); | |
1918 break; | |
1919 case JVM_CONSTANT_InvokeDynamic : | |
1920 { | |
1921 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); | |
1922 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); | |
1923 int argc = invoke_dynamic_argument_count_at(index); | |
1924 if (argc > 0) { | |
1925 for (int arg_i = 0; arg_i < argc; arg_i++) { | |
1926 int arg = invoke_dynamic_argument_index_at(index, arg_i); | |
1927 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); | |
1928 } | |
1929 st->print("}"); | |
1930 } | |
1931 } | |
1932 break; | |
1933 default: | |
1934 ShouldNotReachHere(); | |
1935 break; | |
1936 } | |
1937 st->cr(); | |
1938 } | |
1939 | |
1940 void ConstantPool::print_value_on(outputStream* st) const { | |
1941 assert(is_constantPool(), "must be constantPool"); | |
1942 st->print("constant pool [%d]", length()); | |
1943 if (has_pseudo_string()) st->print("/pseudo_string"); | |
1944 if (has_invokedynamic()) st->print("/invokedynamic"); | |
1945 if (has_preresolution()) st->print("/preresolution"); | |
1946 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); | |
1947 print_address_on(st); | |
1948 st->print(" for "); | |
1949 pool_holder()->print_value_on(st); | |
1950 if (pool_holder() != NULL) { | |
1951 bool extra = (pool_holder()->constants() != this); | |
1952 if (extra) st->print(" (extra)"); | |
1953 } | |
1954 if (cache() != NULL) { | |
1955 st->print(" cache=" PTR_FORMAT, cache()); | |
1956 } | |
1957 } | |
1958 | |
1959 | |
1960 // Verification | |
1961 | |
1962 void ConstantPool::verify_on(outputStream* st) { | |
1963 guarantee(is_constantPool(), "object must be constant pool"); | |
1964 for (int i = 0; i< length(); i++) { | |
1965 constantTag tag = tag_at(i); | |
1966 CPSlot entry = slot_at(i); | |
1967 if (tag.is_klass()) { | |
1968 if (entry.is_resolved()) { | |
1969 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); | |
1970 guarantee(entry.get_klass()->is_klass(), "should be klass"); | |
1971 } | |
1972 } else if (tag.is_unresolved_klass()) { | |
1973 if (entry.is_resolved()) { | |
1974 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); | |
1975 guarantee(entry.get_klass()->is_klass(), "should be klass"); | |
1976 } | |
1977 } else if (tag.is_symbol()) { | |
1978 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); | |
1979 } else if (tag.is_string()) { | |
1980 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); | |
1981 } | |
1982 } | |
1983 if (cache() != NULL) { | |
1984 // Note: cache() can be NULL before a class is completely setup or | |
1985 // in temporary constant pools used during constant pool merging | |
1986 guarantee(cache()->is_metadata(), "should be metadata"); | |
1987 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); | |
1988 } | |
1989 if (pool_holder() != NULL) { | |
1990 // Note: pool_holder() can be NULL in temporary constant pools | |
1991 // used during constant pool merging | |
1992 guarantee(pool_holder()->is_metadata(), "should be metadata"); | |
1993 guarantee(pool_holder()->is_klass(), "should be klass"); | |
1994 } | |
1995 } | |
1996 | |
1997 | |
1998 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { | |
1999 char *str = sym->as_utf8(); | |
2000 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2001 unsigned int index = hash % table_size(); | |
2002 | |
2003 // check if already in map | |
2004 // we prefer the first entry since it is more likely to be what was used in | |
2005 // the class file | |
2006 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2007 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2008 if (en->hash() == hash && en->symbol() == sym) { | |
2009 return; // already there | |
2010 } | |
2011 } | |
2012 | |
2013 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2014 entry->set_next(bucket(index)); | |
2015 _buckets[index].set_entry(entry); | |
2016 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2017 } | |
2018 | |
2019 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { | |
2020 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); | |
2021 char *str = sym->as_utf8(); | |
2022 int len = sym->utf8_length(); | |
2023 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2024 unsigned int index = hash % table_size(); | |
2025 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2026 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2027 if (en->hash() == hash && en->symbol() == sym) { | |
2028 return en; | |
2029 } | |
2030 } | |
2031 return NULL; | |
2032 } |