Thu, 07 Apr 2011 17:02:30 -0700
6981791: remove experimental code for JSR 292
Reviewed-by: twisti
1 /*
2 * Copyright (c) 1997, 2011, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/constantPoolOop.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/objArrayKlass.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "runtime/fieldType.hpp"
38 #include "runtime/init.hpp"
39 #include "runtime/signature.hpp"
40 #include "runtime/vframe.hpp"
42 void constantPoolOopDesc::set_flag_at(FlagBit fb) {
43 const int MAX_STATE_CHANGES = 2;
44 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
45 int oflags = _flags;
46 int nflags = oflags | (1 << (int)fb);
47 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
48 return;
49 }
50 assert(false, "failed to cmpxchg flags");
51 _flags |= (1 << (int)fb); // better than nothing
52 }
54 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
55 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
56 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
57 // tag is not updated atomicly.
58 CPSlot entry = this_oop->slot_at(which);
59 if (entry.is_oop()) {
60 assert(entry.get_oop()->is_klass(), "must be");
61 // Already resolved - return entry.
62 return (klassOop)entry.get_oop();
63 }
65 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
66 // already has updated the object
67 assert(THREAD->is_Java_thread(), "must be a Java thread");
68 bool do_resolve = false;
69 bool in_error = false;
71 Symbol* name = NULL;
72 Handle loader;
73 { ObjectLocker ol(this_oop, THREAD);
75 if (this_oop->tag_at(which).is_unresolved_klass()) {
76 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
77 in_error = true;
78 } else {
79 do_resolve = true;
80 name = this_oop->unresolved_klass_at(which);
81 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
82 }
83 }
84 } // unlocking constantPool
87 // The original attempt to resolve this constant pool entry failed so find the
88 // original error and throw it again (JVMS 5.4.3).
89 if (in_error) {
90 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
91 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
92 ResourceMark rm;
93 // exception text will be the class name
94 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
95 THROW_MSG_0(error, className);
96 }
98 if (do_resolve) {
99 // this_oop must be unlocked during resolve_or_fail
100 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
101 Handle h_prot (THREAD, protection_domain);
102 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
103 KlassHandle k;
104 if (!HAS_PENDING_EXCEPTION) {
105 k = KlassHandle(THREAD, k_oop);
106 // Do access check for klasses
107 verify_constant_pool_resolve(this_oop, k, THREAD);
108 }
110 // Failed to resolve class. We must record the errors so that subsequent attempts
111 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
112 if (HAS_PENDING_EXCEPTION) {
113 ResourceMark rm;
114 Symbol* error = PENDING_EXCEPTION->klass()->klass_part()->name();
116 bool throw_orig_error = false;
117 {
118 ObjectLocker ol (this_oop, THREAD);
120 // some other thread has beaten us and has resolved the class.
121 if (this_oop->tag_at(which).is_klass()) {
122 CLEAR_PENDING_EXCEPTION;
123 entry = this_oop->resolved_klass_at(which);
124 return (klassOop)entry.get_oop();
125 }
127 if (!PENDING_EXCEPTION->
128 is_a(SystemDictionary::LinkageError_klass())) {
129 // Just throw the exception and don't prevent these classes from
130 // being loaded due to virtual machine errors like StackOverflow
131 // and OutOfMemoryError, etc, or if the thread was hit by stop()
132 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
133 }
134 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
135 SystemDictionary::add_resolution_error(this_oop, which, error);
136 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
137 } else {
138 // some other thread has put the class in error state.
139 error = SystemDictionary::find_resolution_error(this_oop, which);
140 assert(error != NULL, "checking");
141 throw_orig_error = true;
142 }
143 } // unlocked
145 if (throw_orig_error) {
146 CLEAR_PENDING_EXCEPTION;
147 ResourceMark rm;
148 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
149 THROW_MSG_0(error, className);
150 }
152 return 0;
153 }
155 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
156 // skip resolving the constant pool so that this code get's
157 // called the next time some bytecodes refer to this class.
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = NULL;
161 if (JavaThread::current()->has_last_Java_frame()) {
162 // try to identify the method which called this function.
163 vframeStream vfst(JavaThread::current());
164 if (!vfst.at_end()) {
165 line_number = vfst.method()->line_number_from_bci(vfst.bci());
166 Symbol* s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
167 if (s != NULL) {
168 source_file = s->as_C_string();
169 }
170 }
171 }
172 if (k() != this_oop->pool_holder()) {
173 // only print something if the classes are different
174 if (source_file != NULL) {
175 tty->print("RESOLVE %s %s %s:%d\n",
176 instanceKlass::cast(this_oop->pool_holder())->external_name(),
177 instanceKlass::cast(k())->external_name(), source_file, line_number);
178 } else {
179 tty->print("RESOLVE %s %s\n",
180 instanceKlass::cast(this_oop->pool_holder())->external_name(),
181 instanceKlass::cast(k())->external_name());
182 }
183 }
184 return k();
185 } else {
186 ObjectLocker ol (this_oop, THREAD);
187 // Only updated constant pool - if it is resolved.
188 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
189 if (do_resolve) {
190 this_oop->klass_at_put(which, k());
191 }
192 }
193 }
195 entry = this_oop->resolved_klass_at(which);
196 assert(entry.is_oop() && entry.get_oop()->is_klass(), "must be resolved at this point");
197 return (klassOop)entry.get_oop();
198 }
201 // Does not update constantPoolOop - to avoid any exception throwing. Used
202 // by compiler and exception handling. Also used to avoid classloads for
203 // instanceof operations. Returns NULL if the class has not been loaded or
204 // if the verification of constant pool failed
205 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
206 CPSlot entry = this_oop->slot_at(which);
207 if (entry.is_oop()) {
208 assert(entry.get_oop()->is_klass(), "must be");
209 return (klassOop)entry.get_oop();
210 } else {
211 assert(entry.is_metadata(), "must be either symbol or klass");
212 Thread *thread = Thread::current();
213 Symbol* name = entry.get_symbol();
214 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
215 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
216 Handle h_prot (thread, protection_domain);
217 Handle h_loader (thread, loader);
218 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
220 if (k != NULL) {
221 // Make sure that resolving is legal
222 EXCEPTION_MARK;
223 KlassHandle klass(THREAD, k);
224 // return NULL if verification fails
225 verify_constant_pool_resolve(this_oop, klass, THREAD);
226 if (HAS_PENDING_EXCEPTION) {
227 CLEAR_PENDING_EXCEPTION;
228 return NULL;
229 }
230 return klass();
231 } else {
232 return k;
233 }
234 }
235 }
238 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
239 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
240 }
243 // This is an interface for the compiler that allows accessing non-resolved entries
244 // in the constant pool - but still performs the validations tests. Must be used
245 // in a pre-parse of the compiler - to determine what it can do and not do.
246 // Note: We cannot update the ConstantPool from the vm_thread.
247 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
248 int which = this_oop->klass_ref_index_at(index);
249 CPSlot entry = this_oop->slot_at(which);
250 if (entry.is_oop()) {
251 assert(entry.get_oop()->is_klass(), "must be");
252 return (klassOop)entry.get_oop();
253 } else {
254 assert(entry.is_metadata(), "must be either symbol or klass");
255 Symbol* name = entry.get_symbol();
256 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
257 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
258 Handle h_loader(THREAD, loader);
259 Handle h_prot (THREAD, protection_domain);
260 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
262 // Do access check for klasses
263 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
264 return k();
265 }
266 }
269 Symbol* constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
270 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
271 return symbol_at(name_index);
272 }
275 Symbol* constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
276 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
277 return symbol_at(signature_index);
278 }
281 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
282 int i = which;
283 if (!uncached && cache() != NULL) {
284 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
285 // Invokedynamic index.
286 int pool_index = cache()->main_entry_at(which)->constant_pool_index();
287 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
288 assert(tag_at(pool_index).is_name_and_type(), "");
289 return pool_index;
290 }
291 // change byte-ordering and go via cache
292 i = remap_instruction_operand_from_cache(which);
293 } else {
294 if (tag_at(which).is_invoke_dynamic()) {
295 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
296 assert(tag_at(pool_index).is_name_and_type(), "");
297 return pool_index;
298 }
299 }
300 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
301 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
302 jint ref_index = *int_at_addr(i);
303 return extract_high_short_from_int(ref_index);
304 }
307 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
308 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
309 "an invokedynamic instruction does not have a klass");
310 int i = which;
311 if (!uncached && cache() != NULL) {
312 // change byte-ordering and go via cache
313 i = remap_instruction_operand_from_cache(which);
314 }
315 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
316 jint ref_index = *int_at_addr(i);
317 return extract_low_short_from_int(ref_index);
318 }
322 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
323 int cpc_index = operand;
324 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
325 assert((int)(u2)cpc_index == cpc_index, "clean u2");
326 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
327 return member_index;
328 }
331 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
332 if (k->oop_is_instance() || k->oop_is_objArray()) {
333 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
334 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
335 KlassHandle element (THREAD, elem_oop);
337 // The element type could be a typeArray - we only need the access check if it is
338 // an reference to another class
339 if (element->oop_is_instance()) {
340 LinkResolver::check_klass_accessability(holder, element, CHECK);
341 }
342 }
343 }
346 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
347 jint ref_index = name_and_type_at(which_nt);
348 return extract_low_short_from_int(ref_index);
349 }
352 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
353 jint ref_index = name_and_type_at(which_nt);
354 return extract_high_short_from_int(ref_index);
355 }
358 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
359 return klass_at(klass_ref_index_at(which), CHECK_NULL);
360 }
363 Symbol* constantPoolOopDesc::klass_name_at(int which) {
364 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
365 "Corrupted constant pool");
366 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
367 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
368 // tag is not updated atomicly.
369 CPSlot entry = slot_at(which);
370 if (entry.is_oop()) {
371 // Already resolved - return entry's name.
372 assert(entry.get_oop()->is_klass(), "must be");
373 return klassOop(entry.get_oop())->klass_part()->name();
374 } else {
375 assert(entry.is_metadata(), "must be either symbol or klass");
376 return entry.get_symbol();
377 }
378 }
380 Symbol* constantPoolOopDesc::klass_ref_at_noresolve(int which) {
381 jint ref_index = klass_ref_index_at(which);
382 return klass_at_noresolve(ref_index);
383 }
385 Symbol* constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) {
386 jint ref_index = uncached_klass_ref_index_at(which);
387 return klass_at_noresolve(ref_index);
388 }
390 char* constantPoolOopDesc::string_at_noresolve(int which) {
391 // Test entry type in case string is resolved while in here.
392 CPSlot entry = slot_at(which);
393 if (entry.is_metadata()) {
394 return (entry.get_symbol())->as_C_string();
395 } else if (java_lang_String::is_instance(entry.get_oop())) {
396 return java_lang_String::as_utf8_string(entry.get_oop());
397 } else {
398 return (char*)"<pseudo-string>";
399 }
400 }
403 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
404 return FieldType::basic_type(symbol_at(which));
405 }
408 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
409 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
410 if (this_oop->tag_at(index).is_unresolved_string()) {
411 this_oop->string_at(index, CHECK);
412 }
413 }
414 }
416 // A resolved constant value in the CP cache is represented as a non-null
417 // value. As a special case, this value can be a 'systemObjArray'
418 // which masks an exception object to throw.
419 // This allows a MethodHandle constant reference to throw a consistent
420 // exception every time, if it fails to resolve.
421 static oop decode_exception_from_f1(oop result_oop, TRAPS) {
422 if (result_oop->klass() != Universe::systemObjArrayKlassObj())
423 return result_oop;
425 // Special cases here: Masked null, saved exception.
426 objArrayOop sys_array = (objArrayOop) result_oop;
427 assert(sys_array->length() == 1, "bad system array");
428 if (sys_array->length() == 1) {
429 THROW_OOP_(sys_array->obj_at(0), NULL);
430 }
431 return NULL;
432 }
434 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
435 oop result_oop = NULL;
436 Handle throw_exception;
438 if (cache_index == _possible_index_sentinel) {
439 // It is possible that this constant is one which is cached in the CP cache.
440 // We'll do a linear search. This should be OK because this usage is rare.
441 assert(index > 0, "valid index");
442 constantPoolCacheOop cache = this_oop()->cache();
443 for (int i = 0, len = cache->length(); i < len; i++) {
444 ConstantPoolCacheEntry* cpc_entry = cache->entry_at(i);
445 if (!cpc_entry->is_secondary_entry() && cpc_entry->constant_pool_index() == index) {
446 // Switch the query to use this CPC entry.
447 cache_index = i;
448 index = _no_index_sentinel;
449 break;
450 }
451 }
452 if (cache_index == _possible_index_sentinel)
453 cache_index = _no_index_sentinel; // not found
454 }
455 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
456 assert(index == _no_index_sentinel || index >= 0, "");
458 if (cache_index >= 0) {
459 assert(index == _no_index_sentinel, "only one kind of index at a time");
460 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
461 result_oop = cpc_entry->f1();
462 if (result_oop != NULL) {
463 return decode_exception_from_f1(result_oop, THREAD);
464 // That was easy...
465 }
466 index = cpc_entry->constant_pool_index();
467 }
469 jvalue prim_value; // temp used only in a few cases below
471 int tag_value = this_oop->tag_at(index).value();
472 switch (tag_value) {
474 case JVM_CONSTANT_UnresolvedClass:
475 case JVM_CONSTANT_UnresolvedClassInError:
476 case JVM_CONSTANT_Class:
477 {
478 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL);
479 // ldc wants the java mirror.
480 result_oop = resolved->java_mirror();
481 break;
482 }
484 case JVM_CONSTANT_String:
485 case JVM_CONSTANT_UnresolvedString:
486 if (this_oop->is_pseudo_string_at(index)) {
487 result_oop = this_oop->pseudo_string_at(index);
488 break;
489 }
490 result_oop = string_at_impl(this_oop, index, CHECK_NULL);
491 break;
493 case JVM_CONSTANT_Object:
494 result_oop = this_oop->object_at(index);
495 break;
497 case JVM_CONSTANT_MethodHandle:
498 {
499 int ref_kind = this_oop->method_handle_ref_kind_at(index);
500 int callee_index = this_oop->method_handle_klass_index_at(index);
501 Symbol* name = this_oop->method_handle_name_ref_at(index);
502 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
503 if (PrintMiscellaneous)
504 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
505 ref_kind, index, this_oop->method_handle_index_at(index),
506 callee_index, name->as_C_string(), signature->as_C_string());
507 KlassHandle callee;
508 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
509 callee = KlassHandle(THREAD, k);
510 }
511 KlassHandle klass(THREAD, this_oop->pool_holder());
512 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
513 callee, name, signature,
514 THREAD);
515 if (HAS_PENDING_EXCEPTION) {
516 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
517 CLEAR_PENDING_EXCEPTION;
518 break;
519 }
520 result_oop = value();
521 assert(result_oop != NULL, "");
522 break;
523 }
525 case JVM_CONSTANT_MethodType:
526 {
527 Symbol* signature = this_oop->method_type_signature_at(index);
528 if (PrintMiscellaneous)
529 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
530 index, this_oop->method_type_index_at(index),
531 signature->as_C_string());
532 KlassHandle klass(THREAD, this_oop->pool_holder());
533 bool ignore_is_on_bcp = false;
534 Handle value = SystemDictionary::find_method_handle_type(signature,
535 klass,
536 false,
537 ignore_is_on_bcp,
538 THREAD);
539 if (HAS_PENDING_EXCEPTION) {
540 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
541 CLEAR_PENDING_EXCEPTION;
542 break;
543 }
544 result_oop = value();
545 assert(result_oop != NULL, "");
546 break;
547 }
549 case JVM_CONSTANT_Integer:
550 prim_value.i = this_oop->int_at(index);
551 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
552 break;
554 case JVM_CONSTANT_Float:
555 prim_value.f = this_oop->float_at(index);
556 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
557 break;
559 case JVM_CONSTANT_Long:
560 prim_value.j = this_oop->long_at(index);
561 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
562 break;
564 case JVM_CONSTANT_Double:
565 prim_value.d = this_oop->double_at(index);
566 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
567 break;
569 default:
570 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
571 this_oop(), index, cache_index, tag_value) );
572 assert(false, "unexpected constant tag");
573 break;
574 }
576 if (cache_index >= 0) {
577 // Cache the oop here also.
578 if (throw_exception.not_null()) {
579 objArrayOop sys_array = oopFactory::new_system_objArray(1, CHECK_NULL);
580 sys_array->obj_at_put(0, throw_exception());
581 result_oop = sys_array;
582 throw_exception = Handle(); // be tidy
583 }
584 Handle result_handle(THREAD, result_oop);
585 result_oop = NULL; // safety
586 ObjectLocker ol(this_oop, THREAD);
587 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
588 result_oop = cpc_entry->f1();
589 // Benign race condition: f1 may already be filled in while we were trying to lock.
590 // The important thing here is that all threads pick up the same result.
591 // It doesn't matter which racing thread wins, as long as only one
592 // result is used by all threads, and all future queries.
593 // That result may be either a resolved constant or a failure exception.
594 if (result_oop == NULL) {
595 result_oop = result_handle();
596 cpc_entry->set_f1(result_oop);
597 }
598 return decode_exception_from_f1(result_oop, THREAD);
599 } else {
600 if (throw_exception.not_null()) {
601 THROW_HANDLE_(throw_exception, NULL);
602 }
603 return result_oop;
604 }
605 }
607 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
608 oop str = NULL;
609 CPSlot entry = this_oop->slot_at(which);
610 if (entry.is_metadata()) {
611 ObjectLocker ol(this_oop, THREAD);
612 if (this_oop->tag_at(which).is_unresolved_string()) {
613 // Intern string
614 Symbol* sym = this_oop->unresolved_string_at(which);
615 str = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
616 this_oop->string_at_put(which, str);
617 } else {
618 // Another thread beat us and interned string, read string from constant pool
619 str = this_oop->resolved_string_at(which);
620 }
621 } else {
622 str = entry.get_oop();
623 }
624 assert(java_lang_String::is_instance(str), "must be string");
625 return str;
626 }
629 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
630 CPSlot entry = slot_at(which);
631 if (entry.is_metadata())
632 // Not yet resolved, but it will resolve to a string.
633 return false;
634 else if (java_lang_String::is_instance(entry.get_oop()))
635 return false; // actually, it might be a non-interned or non-perm string
636 else
637 // truly pseudo
638 return true;
639 }
642 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
643 int which) {
644 // Names are interned, so we can compare Symbol*s directly
645 Symbol* cp_name = klass_name_at(which);
646 return (cp_name == k->name());
647 }
650 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
651 ResourceMark rm;
652 int count = 0;
653 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
654 if (tag_at(index).is_unresolved_string()) {
655 // Intern string
656 Symbol* sym = unresolved_string_at(index);
657 oop entry = StringTable::intern(sym, CHECK_(-1));
658 string_at_put(index, entry);
659 }
660 }
661 return count;
662 }
664 // Iterate over symbols and decrement ones which are Symbol*s.
665 // This is done during GC so do not need to lock constantPool unless we
666 // have per-thread safepoints.
667 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
668 // these symbols but didn't increment the reference count.
669 void constantPoolOopDesc::unreference_symbols() {
670 for (int index = 1; index < length(); index++) { // Index 0 is unused
671 constantTag tag = tag_at(index);
672 if (tag.is_symbol()) {
673 symbol_at(index)->decrement_refcount();
674 }
675 }
676 }
678 // Iterate over symbols which are used as class, field, method names and
679 // signatures (in preparation for writing to the shared archive).
681 void constantPoolOopDesc::shared_symbols_iterate(SymbolClosure* closure) {
682 for (int index = 1; index < length(); index++) { // Index 0 is unused
683 switch (tag_at(index).value()) {
685 case JVM_CONSTANT_UnresolvedClass:
686 case JVM_CONSTANT_UnresolvedString:
687 case JVM_CONSTANT_Utf8:
688 assert(slot_at(index).is_metadata(), "must be symbol");
689 closure->do_symbol(symbol_at_addr(index));
690 break;
692 case JVM_CONSTANT_NameAndType:
693 {
694 int i = *int_at_addr(index);
695 closure->do_symbol(symbol_at_addr((unsigned)i >> 16));
696 closure->do_symbol(symbol_at_addr((unsigned)i & 0xffff));
697 }
698 break;
700 case JVM_CONSTANT_Class:
701 case JVM_CONSTANT_InterfaceMethodref:
702 case JVM_CONSTANT_Fieldref:
703 case JVM_CONSTANT_Methodref:
704 case JVM_CONSTANT_Integer:
705 case JVM_CONSTANT_Float:
706 // Do nothing! Not an oop.
707 // These constant types do not reference symbols at this point.
708 break;
710 case JVM_CONSTANT_String:
711 // Do nothing! Not a symbol.
712 break;
714 case JVM_CONSTANT_Long:
715 case JVM_CONSTANT_Double:
716 // Do nothing! Not an oop. (But takes two pool entries.)
717 ++index;
718 break;
720 default:
721 ShouldNotReachHere();
722 break;
723 }
724 }
725 }
728 // Iterate over the [one] tags array (in preparation for writing to the
729 // shared archive).
731 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
732 closure->do_oop(tags_addr());
733 closure->do_oop(operands_addr());
734 }
737 // Iterate over String objects (in preparation for writing to the shared
738 // archive).
740 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
741 for (int index = 1; index < length(); index++) { // Index 0 is unused
742 switch (tag_at(index).value()) {
744 case JVM_CONSTANT_UnresolvedClass:
745 case JVM_CONSTANT_NameAndType:
746 // Do nothing! Not a String.
747 break;
749 case JVM_CONSTANT_Class:
750 case JVM_CONSTANT_InterfaceMethodref:
751 case JVM_CONSTANT_Fieldref:
752 case JVM_CONSTANT_Methodref:
753 case JVM_CONSTANT_Integer:
754 case JVM_CONSTANT_Float:
755 // Do nothing! Not an oop.
756 // These constant types do not reference symbols at this point.
757 break;
759 case JVM_CONSTANT_String:
760 closure->do_oop(obj_at_addr_raw(index));
761 break;
763 case JVM_CONSTANT_UnresolvedString:
764 case JVM_CONSTANT_Utf8:
765 // These constants are symbols, but unless these symbols are
766 // actually to be used for something, we don't want to mark them.
767 break;
769 case JVM_CONSTANT_Long:
770 case JVM_CONSTANT_Double:
771 // Do nothing! Not an oop. (But takes two pool entries.)
772 ++index;
773 break;
775 default:
776 ShouldNotReachHere();
777 break;
778 }
779 }
780 }
783 // Compare this constant pool's entry at index1 to the constant pool
784 // cp2's entry at index2.
785 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
786 int index2, TRAPS) {
788 jbyte t1 = tag_at(index1).value();
789 jbyte t2 = cp2->tag_at(index2).value();
792 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
793 // when comparing
794 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
795 t1 = JVM_CONSTANT_UnresolvedClass;
796 }
797 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
798 t2 = JVM_CONSTANT_UnresolvedClass;
799 }
801 if (t1 != t2) {
802 // Not the same entry type so there is nothing else to check. Note
803 // that this style of checking will consider resolved/unresolved
804 // class pairs and resolved/unresolved string pairs as different.
805 // From the constantPoolOop API point of view, this is correct
806 // behavior. See constantPoolKlass::merge() to see how this plays
807 // out in the context of constantPoolOop merging.
808 return false;
809 }
811 switch (t1) {
812 case JVM_CONSTANT_Class:
813 {
814 klassOop k1 = klass_at(index1, CHECK_false);
815 klassOop k2 = cp2->klass_at(index2, CHECK_false);
816 if (k1 == k2) {
817 return true;
818 }
819 } break;
821 case JVM_CONSTANT_ClassIndex:
822 {
823 int recur1 = klass_index_at(index1);
824 int recur2 = cp2->klass_index_at(index2);
825 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
826 if (match) {
827 return true;
828 }
829 } break;
831 case JVM_CONSTANT_Double:
832 {
833 jdouble d1 = double_at(index1);
834 jdouble d2 = cp2->double_at(index2);
835 if (d1 == d2) {
836 return true;
837 }
838 } break;
840 case JVM_CONSTANT_Fieldref:
841 case JVM_CONSTANT_InterfaceMethodref:
842 case JVM_CONSTANT_Methodref:
843 {
844 int recur1 = uncached_klass_ref_index_at(index1);
845 int recur2 = cp2->uncached_klass_ref_index_at(index2);
846 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
847 if (match) {
848 recur1 = uncached_name_and_type_ref_index_at(index1);
849 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
850 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
851 if (match) {
852 return true;
853 }
854 }
855 } break;
857 case JVM_CONSTANT_Float:
858 {
859 jfloat f1 = float_at(index1);
860 jfloat f2 = cp2->float_at(index2);
861 if (f1 == f2) {
862 return true;
863 }
864 } break;
866 case JVM_CONSTANT_Integer:
867 {
868 jint i1 = int_at(index1);
869 jint i2 = cp2->int_at(index2);
870 if (i1 == i2) {
871 return true;
872 }
873 } break;
875 case JVM_CONSTANT_Long:
876 {
877 jlong l1 = long_at(index1);
878 jlong l2 = cp2->long_at(index2);
879 if (l1 == l2) {
880 return true;
881 }
882 } break;
884 case JVM_CONSTANT_NameAndType:
885 {
886 int recur1 = name_ref_index_at(index1);
887 int recur2 = cp2->name_ref_index_at(index2);
888 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
889 if (match) {
890 recur1 = signature_ref_index_at(index1);
891 recur2 = cp2->signature_ref_index_at(index2);
892 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
893 if (match) {
894 return true;
895 }
896 }
897 } break;
899 case JVM_CONSTANT_String:
900 {
901 oop s1 = string_at(index1, CHECK_false);
902 oop s2 = cp2->string_at(index2, CHECK_false);
903 if (s1 == s2) {
904 return true;
905 }
906 } break;
908 case JVM_CONSTANT_StringIndex:
909 {
910 int recur1 = string_index_at(index1);
911 int recur2 = cp2->string_index_at(index2);
912 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
913 if (match) {
914 return true;
915 }
916 } break;
918 case JVM_CONSTANT_UnresolvedClass:
919 {
920 Symbol* k1 = unresolved_klass_at(index1);
921 Symbol* k2 = cp2->unresolved_klass_at(index2);
922 if (k1 == k2) {
923 return true;
924 }
925 } break;
927 case JVM_CONSTANT_MethodType:
928 {
929 int k1 = method_type_index_at(index1);
930 int k2 = cp2->method_type_index_at(index2);
931 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
932 if (match) {
933 return true;
934 }
935 } break;
937 case JVM_CONSTANT_MethodHandle:
938 {
939 int k1 = method_handle_ref_kind_at(index1);
940 int k2 = cp2->method_handle_ref_kind_at(index2);
941 if (k1 == k2) {
942 int i1 = method_handle_index_at(index1);
943 int i2 = cp2->method_handle_index_at(index2);
944 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
945 if (match) {
946 return true;
947 }
948 }
949 } break;
951 case JVM_CONSTANT_InvokeDynamic:
952 {
953 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
954 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
955 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
956 if (!match) return false;
957 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
958 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
959 match = compare_entry_to(k1, cp2, k2, CHECK_false);
960 if (!match) return false;
961 int argc = invoke_dynamic_argument_count_at(index1);
962 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
963 for (int j = 0; j < argc; j++) {
964 k1 = invoke_dynamic_argument_index_at(index1, j);
965 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
966 match = compare_entry_to(k1, cp2, k2, CHECK_false);
967 if (!match) return false;
968 }
969 return true; // got through loop; all elements equal
970 }
971 } break;
973 case JVM_CONSTANT_UnresolvedString:
974 {
975 Symbol* s1 = unresolved_string_at(index1);
976 Symbol* s2 = cp2->unresolved_string_at(index2);
977 if (s1 == s2) {
978 return true;
979 }
980 } break;
982 case JVM_CONSTANT_Utf8:
983 {
984 Symbol* s1 = symbol_at(index1);
985 Symbol* s2 = cp2->symbol_at(index2);
986 if (s1 == s2) {
987 return true;
988 }
989 } break;
991 // Invalid is used as the tag for the second constant pool entry
992 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
993 // not be seen by itself.
994 case JVM_CONSTANT_Invalid: // fall through
996 default:
997 ShouldNotReachHere();
998 break;
999 }
1001 return false;
1002 } // end compare_entry_to()
1005 // Copy this constant pool's entries at start_i to end_i (inclusive)
1006 // to the constant pool to_cp's entries starting at to_i. A total of
1007 // (end_i - start_i) + 1 entries are copied.
1008 void constantPoolOopDesc::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1009 constantPoolHandle to_cp, int to_i, TRAPS) {
1011 int dest_i = to_i; // leave original alone for debug purposes
1013 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1014 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1016 switch (from_cp->tag_at(src_i).value()) {
1017 case JVM_CONSTANT_Double:
1018 case JVM_CONSTANT_Long:
1019 // double and long take two constant pool entries
1020 src_i += 2;
1021 dest_i += 2;
1022 break;
1024 default:
1025 // all others take one constant pool entry
1026 src_i++;
1027 dest_i++;
1028 break;
1029 }
1030 }
1032 int from_oplen = operand_array_length(from_cp->operands());
1033 int old_oplen = operand_array_length(to_cp->operands());
1034 if (from_oplen != 0) {
1035 // append my operands to the target's operands array
1036 if (old_oplen == 0) {
1037 to_cp->set_operands(from_cp->operands()); // reuse; do not merge
1038 } else {
1039 int old_len = to_cp->operands()->length();
1040 int from_len = from_cp->operands()->length();
1041 int old_off = old_oplen * sizeof(u2);
1042 int from_off = from_oplen * sizeof(u2);
1043 typeArrayHandle new_operands = oopFactory::new_permanent_shortArray(old_len + from_len, CHECK);
1044 int fillp = 0, len = 0;
1045 // first part of dest
1046 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1047 new_operands->short_at_addr(fillp),
1048 (len = old_off) * sizeof(u2));
1049 fillp += len;
1050 // first part of src
1051 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1052 new_operands->short_at_addr(fillp),
1053 (len = from_off) * sizeof(u2));
1054 fillp += len;
1055 // second part of dest
1056 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(old_off),
1057 new_operands->short_at_addr(fillp),
1058 (len = old_len - old_off) * sizeof(u2));
1059 fillp += len;
1060 // second part of src
1061 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(from_off),
1062 new_operands->short_at_addr(fillp),
1063 (len = from_len - from_off) * sizeof(u2));
1064 fillp += len;
1065 assert(fillp == new_operands->length(), "");
1067 // Adjust indexes in the first part of the copied operands array.
1068 for (int j = 0; j < from_oplen; j++) {
1069 int offset = operand_offset_at(new_operands(), old_oplen + j);
1070 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1071 offset += old_len; // every new tuple is preceded by old_len extra u2's
1072 operand_offset_at_put(new_operands(), old_oplen + j, offset);
1073 }
1075 // replace target operands array with combined array
1076 to_cp->set_operands(new_operands());
1077 }
1078 }
1080 } // end copy_cp_to()
1083 // Copy this constant pool's entry at from_i to the constant pool
1084 // to_cp's entry at to_i.
1085 void constantPoolOopDesc::copy_entry_to(constantPoolHandle from_cp, int from_i,
1086 constantPoolHandle to_cp, int to_i,
1087 TRAPS) {
1089 int tag = from_cp->tag_at(from_i).value();
1090 switch (tag) {
1091 case JVM_CONSTANT_Class:
1092 {
1093 klassOop k = from_cp->klass_at(from_i, CHECK);
1094 to_cp->klass_at_put(to_i, k);
1095 } break;
1097 case JVM_CONSTANT_ClassIndex:
1098 {
1099 jint ki = from_cp->klass_index_at(from_i);
1100 to_cp->klass_index_at_put(to_i, ki);
1101 } break;
1103 case JVM_CONSTANT_Double:
1104 {
1105 jdouble d = from_cp->double_at(from_i);
1106 to_cp->double_at_put(to_i, d);
1107 // double takes two constant pool entries so init second entry's tag
1108 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1109 } break;
1111 case JVM_CONSTANT_Fieldref:
1112 {
1113 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1114 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1115 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1116 } break;
1118 case JVM_CONSTANT_Float:
1119 {
1120 jfloat f = from_cp->float_at(from_i);
1121 to_cp->float_at_put(to_i, f);
1122 } break;
1124 case JVM_CONSTANT_Integer:
1125 {
1126 jint i = from_cp->int_at(from_i);
1127 to_cp->int_at_put(to_i, i);
1128 } break;
1130 case JVM_CONSTANT_InterfaceMethodref:
1131 {
1132 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1133 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1134 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1135 } break;
1137 case JVM_CONSTANT_Long:
1138 {
1139 jlong l = from_cp->long_at(from_i);
1140 to_cp->long_at_put(to_i, l);
1141 // long takes two constant pool entries so init second entry's tag
1142 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1143 } break;
1145 case JVM_CONSTANT_Methodref:
1146 {
1147 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1148 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1149 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1150 } break;
1152 case JVM_CONSTANT_NameAndType:
1153 {
1154 int name_ref_index = from_cp->name_ref_index_at(from_i);
1155 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1156 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1157 } break;
1159 case JVM_CONSTANT_String:
1160 {
1161 oop s = from_cp->string_at(from_i, CHECK);
1162 to_cp->string_at_put(to_i, s);
1163 } break;
1165 case JVM_CONSTANT_StringIndex:
1166 {
1167 jint si = from_cp->string_index_at(from_i);
1168 to_cp->string_index_at_put(to_i, si);
1169 } break;
1171 case JVM_CONSTANT_UnresolvedClass:
1172 {
1173 // Can be resolved after checking tag, so check the slot first.
1174 CPSlot entry = from_cp->slot_at(from_i);
1175 if (entry.is_oop()) {
1176 assert(entry.get_oop()->is_klass(), "must be");
1177 // Already resolved
1178 to_cp->klass_at_put(to_i, (klassOop)entry.get_oop());
1179 } else {
1180 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1181 }
1182 } break;
1184 case JVM_CONSTANT_UnresolvedClassInError:
1185 {
1186 Symbol* k = from_cp->unresolved_klass_at(from_i);
1187 to_cp->unresolved_klass_at_put(to_i, k);
1188 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1189 } break;
1192 case JVM_CONSTANT_UnresolvedString:
1193 {
1194 // Can be resolved after checking tag, so check the slot first.
1195 CPSlot entry = from_cp->slot_at(from_i);
1196 if (entry.is_oop()) {
1197 // Already resolved (either string or pseudo-string)
1198 to_cp->string_at_put(to_i, entry.get_oop());
1199 } else {
1200 to_cp->unresolved_string_at_put(to_i, entry.get_symbol());
1201 }
1202 } break;
1204 case JVM_CONSTANT_Utf8:
1205 {
1206 Symbol* s = from_cp->symbol_at(from_i);
1207 to_cp->symbol_at_put(to_i, s);
1208 // This constantPool has the same lifetime as the original, so don't
1209 // increase reference counts for the copy.
1210 } break;
1212 case JVM_CONSTANT_MethodType:
1213 {
1214 jint k = from_cp->method_type_index_at(from_i);
1215 to_cp->method_type_index_at_put(to_i, k);
1216 } break;
1218 case JVM_CONSTANT_MethodHandle:
1219 {
1220 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1221 int k2 = from_cp->method_handle_index_at(from_i);
1222 to_cp->method_handle_index_at_put(to_i, k1, k2);
1223 } break;
1225 case JVM_CONSTANT_InvokeDynamic:
1226 {
1227 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1228 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1229 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1230 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1231 } break;
1233 // Invalid is used as the tag for the second constant pool entry
1234 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1235 // not be seen by itself.
1236 case JVM_CONSTANT_Invalid: // fall through
1238 default:
1239 {
1240 ShouldNotReachHere();
1241 } break;
1242 }
1243 } // end copy_entry_to()
1246 // Search constant pool search_cp for an entry that matches this
1247 // constant pool's entry at pattern_i. Returns the index of a
1248 // matching entry or zero (0) if there is no matching entry.
1249 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1250 constantPoolHandle search_cp, TRAPS) {
1252 // index zero (0) is not used
1253 for (int i = 1; i < search_cp->length(); i++) {
1254 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1255 if (found) {
1256 return i;
1257 }
1258 }
1260 return 0; // entry not found; return unused index zero (0)
1261 } // end find_matching_entry()
1264 #ifndef PRODUCT
1266 const char* constantPoolOopDesc::printable_name_at(int which) {
1268 constantTag tag = tag_at(which);
1270 if (tag.is_unresolved_string() || tag.is_string()) {
1271 return string_at_noresolve(which);
1272 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1273 return klass_name_at(which)->as_C_string();
1274 } else if (tag.is_symbol()) {
1275 return symbol_at(which)->as_C_string();
1276 }
1277 return "";
1278 }
1280 #endif // PRODUCT
1283 // JVMTI GetConstantPool support
1285 // For temporary use until code is stable.
1286 #define DBG(code)
1288 static const char* WARN_MSG = "Must not be such entry!";
1290 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1291 jint size = 0;
1292 u2 idx1, idx2;
1294 for (jint idx = 1; idx < cnt; idx++) {
1295 jint ent_size = 0;
1296 u1 tag = *bytes++;
1297 size++; // count tag
1299 printf("const #%03d, tag: %02d ", idx, tag);
1300 switch(tag) {
1301 case JVM_CONSTANT_Invalid: {
1302 printf("Invalid");
1303 break;
1304 }
1305 case JVM_CONSTANT_Unicode: {
1306 printf("Unicode %s", WARN_MSG);
1307 break;
1308 }
1309 case JVM_CONSTANT_Utf8: {
1310 u2 len = Bytes::get_Java_u2(bytes);
1311 char str[128];
1312 if (len > 127) {
1313 len = 127;
1314 }
1315 strncpy(str, (char *) (bytes+2), len);
1316 str[len] = '\0';
1317 printf("Utf8 \"%s\"", str);
1318 ent_size = 2 + len;
1319 break;
1320 }
1321 case JVM_CONSTANT_Integer: {
1322 u4 val = Bytes::get_Java_u4(bytes);
1323 printf("int %d", *(int *) &val);
1324 ent_size = 4;
1325 break;
1326 }
1327 case JVM_CONSTANT_Float: {
1328 u4 val = Bytes::get_Java_u4(bytes);
1329 printf("float %5.3ff", *(float *) &val);
1330 ent_size = 4;
1331 break;
1332 }
1333 case JVM_CONSTANT_Long: {
1334 u8 val = Bytes::get_Java_u8(bytes);
1335 printf("long "INT64_FORMAT, *(jlong *) &val);
1336 ent_size = 8;
1337 idx++; // Long takes two cpool slots
1338 break;
1339 }
1340 case JVM_CONSTANT_Double: {
1341 u8 val = Bytes::get_Java_u8(bytes);
1342 printf("double %5.3fd", *(jdouble *)&val);
1343 ent_size = 8;
1344 idx++; // Double takes two cpool slots
1345 break;
1346 }
1347 case JVM_CONSTANT_Class: {
1348 idx1 = Bytes::get_Java_u2(bytes);
1349 printf("class #%03d", idx1);
1350 ent_size = 2;
1351 break;
1352 }
1353 case JVM_CONSTANT_String: {
1354 idx1 = Bytes::get_Java_u2(bytes);
1355 printf("String #%03d", idx1);
1356 ent_size = 2;
1357 break;
1358 }
1359 case JVM_CONSTANT_Fieldref: {
1360 idx1 = Bytes::get_Java_u2(bytes);
1361 idx2 = Bytes::get_Java_u2(bytes+2);
1362 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1363 ent_size = 4;
1364 break;
1365 }
1366 case JVM_CONSTANT_Methodref: {
1367 idx1 = Bytes::get_Java_u2(bytes);
1368 idx2 = Bytes::get_Java_u2(bytes+2);
1369 printf("Method #%03d, #%03d", idx1, idx2);
1370 ent_size = 4;
1371 break;
1372 }
1373 case JVM_CONSTANT_InterfaceMethodref: {
1374 idx1 = Bytes::get_Java_u2(bytes);
1375 idx2 = Bytes::get_Java_u2(bytes+2);
1376 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1377 ent_size = 4;
1378 break;
1379 }
1380 case JVM_CONSTANT_NameAndType: {
1381 idx1 = Bytes::get_Java_u2(bytes);
1382 idx2 = Bytes::get_Java_u2(bytes+2);
1383 printf("NameAndType #%03d, #%03d", idx1, idx2);
1384 ent_size = 4;
1385 break;
1386 }
1387 case JVM_CONSTANT_ClassIndex: {
1388 printf("ClassIndex %s", WARN_MSG);
1389 break;
1390 }
1391 case JVM_CONSTANT_UnresolvedClass: {
1392 printf("UnresolvedClass: %s", WARN_MSG);
1393 break;
1394 }
1395 case JVM_CONSTANT_UnresolvedClassInError: {
1396 printf("UnresolvedClassInErr: %s", WARN_MSG);
1397 break;
1398 }
1399 case JVM_CONSTANT_StringIndex: {
1400 printf("StringIndex: %s", WARN_MSG);
1401 break;
1402 }
1403 case JVM_CONSTANT_UnresolvedString: {
1404 printf("UnresolvedString: %s", WARN_MSG);
1405 break;
1406 }
1407 }
1408 printf(";\n");
1409 bytes += ent_size;
1410 size += ent_size;
1411 }
1412 printf("Cpool size: %d\n", size);
1413 fflush(0);
1414 return;
1415 } /* end print_cpool_bytes */
1418 // Returns size of constant pool entry.
1419 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1420 switch(tag_at(idx).value()) {
1421 case JVM_CONSTANT_Invalid:
1422 case JVM_CONSTANT_Unicode:
1423 return 1;
1425 case JVM_CONSTANT_Utf8:
1426 return 3 + symbol_at(idx)->utf8_length();
1428 case JVM_CONSTANT_Class:
1429 case JVM_CONSTANT_String:
1430 case JVM_CONSTANT_ClassIndex:
1431 case JVM_CONSTANT_UnresolvedClass:
1432 case JVM_CONSTANT_UnresolvedClassInError:
1433 case JVM_CONSTANT_StringIndex:
1434 case JVM_CONSTANT_UnresolvedString:
1435 case JVM_CONSTANT_MethodType:
1436 return 3;
1438 case JVM_CONSTANT_MethodHandle:
1439 return 4; //tag, ref_kind, ref_index
1441 case JVM_CONSTANT_Integer:
1442 case JVM_CONSTANT_Float:
1443 case JVM_CONSTANT_Fieldref:
1444 case JVM_CONSTANT_Methodref:
1445 case JVM_CONSTANT_InterfaceMethodref:
1446 case JVM_CONSTANT_NameAndType:
1447 return 5;
1449 case JVM_CONSTANT_InvokeDynamic:
1450 // u1 tag, u2 bsm, u2 nt
1451 return 5;
1453 case JVM_CONSTANT_Long:
1454 case JVM_CONSTANT_Double:
1455 return 9;
1456 }
1457 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1458 return 1;
1459 } /* end cpool_entry_size */
1462 // SymbolHashMap is used to find a constant pool index from a string.
1463 // This function fills in SymbolHashMaps, one for utf8s and one for
1464 // class names, returns size of the cpool raw bytes.
1465 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1466 SymbolHashMap *classmap) {
1467 jint size = 0;
1469 for (u2 idx = 1; idx < length(); idx++) {
1470 u2 tag = tag_at(idx).value();
1471 size += cpool_entry_size(idx);
1473 switch(tag) {
1474 case JVM_CONSTANT_Utf8: {
1475 Symbol* sym = symbol_at(idx);
1476 symmap->add_entry(sym, idx);
1477 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1478 break;
1479 }
1480 case JVM_CONSTANT_Class:
1481 case JVM_CONSTANT_UnresolvedClass:
1482 case JVM_CONSTANT_UnresolvedClassInError: {
1483 Symbol* sym = klass_name_at(idx);
1484 classmap->add_entry(sym, idx);
1485 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1486 break;
1487 }
1488 case JVM_CONSTANT_Long:
1489 case JVM_CONSTANT_Double: {
1490 idx++; // Both Long and Double take two cpool slots
1491 break;
1492 }
1493 }
1494 }
1495 return size;
1496 } /* end hash_utf8_entries_to */
1499 // Copy cpool bytes.
1500 // Returns:
1501 // 0, in case of OutOfMemoryError
1502 // -1, in case of internal error
1503 // > 0, count of the raw cpool bytes that have been copied
1504 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1505 SymbolHashMap* tbl,
1506 unsigned char *bytes) {
1507 u2 idx1, idx2;
1508 jint size = 0;
1509 jint cnt = length();
1510 unsigned char *start_bytes = bytes;
1512 for (jint idx = 1; idx < cnt; idx++) {
1513 u1 tag = tag_at(idx).value();
1514 jint ent_size = cpool_entry_size(idx);
1516 assert(size + ent_size <= cpool_size, "Size mismatch");
1518 *bytes = tag;
1519 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1520 switch(tag) {
1521 case JVM_CONSTANT_Invalid: {
1522 DBG(printf("JVM_CONSTANT_Invalid"));
1523 break;
1524 }
1525 case JVM_CONSTANT_Unicode: {
1526 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1527 DBG(printf("JVM_CONSTANT_Unicode"));
1528 break;
1529 }
1530 case JVM_CONSTANT_Utf8: {
1531 Symbol* sym = symbol_at(idx);
1532 char* str = sym->as_utf8();
1533 // Warning! It's crashing on x86 with len = sym->utf8_length()
1534 int len = (int) strlen(str);
1535 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1536 for (int i = 0; i < len; i++) {
1537 bytes[3+i] = (u1) str[i];
1538 }
1539 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1540 break;
1541 }
1542 case JVM_CONSTANT_Integer: {
1543 jint val = int_at(idx);
1544 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1545 break;
1546 }
1547 case JVM_CONSTANT_Float: {
1548 jfloat val = float_at(idx);
1549 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1550 break;
1551 }
1552 case JVM_CONSTANT_Long: {
1553 jlong val = long_at(idx);
1554 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1555 idx++; // Long takes two cpool slots
1556 break;
1557 }
1558 case JVM_CONSTANT_Double: {
1559 jdouble val = double_at(idx);
1560 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1561 idx++; // Double takes two cpool slots
1562 break;
1563 }
1564 case JVM_CONSTANT_Class:
1565 case JVM_CONSTANT_UnresolvedClass:
1566 case JVM_CONSTANT_UnresolvedClassInError: {
1567 *bytes = JVM_CONSTANT_Class;
1568 Symbol* sym = klass_name_at(idx);
1569 idx1 = tbl->symbol_to_value(sym);
1570 assert(idx1 != 0, "Have not found a hashtable entry");
1571 Bytes::put_Java_u2((address) (bytes+1), idx1);
1572 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1573 break;
1574 }
1575 case JVM_CONSTANT_String: {
1576 unsigned int hash;
1577 char *str = string_at_noresolve(idx);
1578 TempNewSymbol sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1579 if (sym == NULL) {
1580 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1581 // this can happen with JVM TI; see CR 6839599 for more details
1582 oop string = *(obj_at_addr_raw(idx));
1583 assert(java_lang_String::is_instance(string),"Not a String");
1584 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1585 idx1 = 0;
1586 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1587 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1588 int length;
1589 Symbol* s = cur->symbol();
1590 jchar* chars = s->as_unicode(length);
1591 if (java_lang_String::equals(string, chars, length)) {
1592 idx1 = cur->value();
1593 DBG(printf("Index found: %d\n",idx1));
1594 break;
1595 }
1596 }
1597 }
1598 } else {
1599 idx1 = tbl->symbol_to_value(sym);
1600 }
1601 assert(idx1 != 0, "Have not found a hashtable entry");
1602 Bytes::put_Java_u2((address) (bytes+1), idx1);
1603 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1604 break;
1605 }
1606 case JVM_CONSTANT_UnresolvedString: {
1607 *bytes = JVM_CONSTANT_String;
1608 Symbol* sym = unresolved_string_at(idx);
1609 idx1 = tbl->symbol_to_value(sym);
1610 assert(idx1 != 0, "Have not found a hashtable entry");
1611 Bytes::put_Java_u2((address) (bytes+1), idx1);
1612 DBG(char *str = sym->as_utf8());
1613 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1614 break;
1615 }
1616 case JVM_CONSTANT_Fieldref:
1617 case JVM_CONSTANT_Methodref:
1618 case JVM_CONSTANT_InterfaceMethodref: {
1619 idx1 = uncached_klass_ref_index_at(idx);
1620 idx2 = uncached_name_and_type_ref_index_at(idx);
1621 Bytes::put_Java_u2((address) (bytes+1), idx1);
1622 Bytes::put_Java_u2((address) (bytes+3), idx2);
1623 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1624 break;
1625 }
1626 case JVM_CONSTANT_NameAndType: {
1627 idx1 = name_ref_index_at(idx);
1628 idx2 = signature_ref_index_at(idx);
1629 Bytes::put_Java_u2((address) (bytes+1), idx1);
1630 Bytes::put_Java_u2((address) (bytes+3), idx2);
1631 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1632 break;
1633 }
1634 case JVM_CONSTANT_ClassIndex: {
1635 *bytes = JVM_CONSTANT_Class;
1636 idx1 = klass_index_at(idx);
1637 Bytes::put_Java_u2((address) (bytes+1), idx1);
1638 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1639 break;
1640 }
1641 case JVM_CONSTANT_StringIndex: {
1642 *bytes = JVM_CONSTANT_String;
1643 idx1 = string_index_at(idx);
1644 Bytes::put_Java_u2((address) (bytes+1), idx1);
1645 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1646 break;
1647 }
1648 case JVM_CONSTANT_MethodHandle: {
1649 *bytes = JVM_CONSTANT_MethodHandle;
1650 int kind = method_handle_ref_kind_at(idx);
1651 idx1 = method_handle_index_at(idx);
1652 *(bytes+1) = (unsigned char) kind;
1653 Bytes::put_Java_u2((address) (bytes+2), idx1);
1654 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1655 break;
1656 }
1657 case JVM_CONSTANT_MethodType: {
1658 *bytes = JVM_CONSTANT_MethodType;
1659 idx1 = method_type_index_at(idx);
1660 Bytes::put_Java_u2((address) (bytes+1), idx1);
1661 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1662 break;
1663 }
1664 case JVM_CONSTANT_InvokeDynamic: {
1665 *bytes = tag;
1666 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1667 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1668 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1669 Bytes::put_Java_u2((address) (bytes+1), idx1);
1670 Bytes::put_Java_u2((address) (bytes+3), idx2);
1671 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1672 break;
1673 }
1674 }
1675 DBG(printf("\n"));
1676 bytes += ent_size;
1677 size += ent_size;
1678 }
1679 assert(size == cpool_size, "Size mismatch");
1681 // Keep temorarily for debugging until it's stable.
1682 DBG(print_cpool_bytes(cnt, start_bytes));
1683 return (int)(bytes - start_bytes);
1684 } /* end copy_cpool_bytes */
1687 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1688 char *str = sym->as_utf8();
1689 unsigned int hash = compute_hash(str, sym->utf8_length());
1690 unsigned int index = hash % table_size();
1692 // check if already in map
1693 // we prefer the first entry since it is more likely to be what was used in
1694 // the class file
1695 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1696 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1697 if (en->hash() == hash && en->symbol() == sym) {
1698 return; // already there
1699 }
1700 }
1702 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1703 entry->set_next(bucket(index));
1704 _buckets[index].set_entry(entry);
1705 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1706 }
1708 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
1709 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1710 char *str = sym->as_utf8();
1711 int len = sym->utf8_length();
1712 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1713 unsigned int index = hash % table_size();
1714 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1715 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1716 if (en->hash() == hash && en->symbol() == sym) {
1717 return en;
1718 }
1719 }
1720 return NULL;
1721 }