1 /*
2 * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl"
26 # include "incls/_constantPoolOop.cpp.incl"
27
28 void constantPoolOopDesc::set_flag_at(FlagBit fb) {
29 const int MAX_STATE_CHANGES = 2;
30 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
31 int oflags = _flags;
32 int nflags = oflags | (1 << (int)fb);
33 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
34 return;
35 }
36 assert(false, "failed to cmpxchg flags");
37 _flags |= (1 << (int)fb); // better than nothing
38 }
39
40 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
41 // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
42 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
43 // tag is not updated atomicly.
44 oop entry = *(this_oop->obj_at_addr(which));
45 if (entry->is_klass()) {
46 // Already resolved - return entry.
47 return (klassOop)entry;
48 }
49
50 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
51 // already has updated the object
52 assert(THREAD->is_Java_thread(), "must be a Java thread");
53 bool do_resolve = false;
54 bool in_error = false;
55
56 symbolHandle name;
57 Handle loader;
58 { ObjectLocker ol(this_oop, THREAD);
59
60 if (this_oop->tag_at(which).is_unresolved_klass()) {
61 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
62 in_error = true;
63 } else {
64 do_resolve = true;
65 name = symbolHandle(THREAD, this_oop->unresolved_klass_at(which));
66 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
67 }
68 }
69 } // unlocking constantPool
70
71
72 // The original attempt to resolve this constant pool entry failed so find the
73 // original error and throw it again (JVMS 5.4.3).
74 if (in_error) {
75 symbolOop error = SystemDictionary::find_resolution_error(this_oop, which);
76 guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table");
77 ResourceMark rm;
78 // exception text will be the class name
79 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
80 THROW_MSG_0(error, className);
81 }
82
83 if (do_resolve) {
84 // this_oop must be unlocked during resolve_or_fail
85 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
86 Handle h_prot (THREAD, protection_domain);
87 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
88 KlassHandle k;
89 if (!HAS_PENDING_EXCEPTION) {
90 k = KlassHandle(THREAD, k_oop);
91 // Do access check for klasses
92 verify_constant_pool_resolve(this_oop, k, THREAD);
93 }
94
95 // Failed to resolve class. We must record the errors so that subsequent attempts
96 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
97 if (HAS_PENDING_EXCEPTION) {
98 ResourceMark rm;
99 symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name());
100
101 bool throw_orig_error = false;
102 {
103 ObjectLocker ol (this_oop, THREAD);
104
105 // some other thread has beaten us and has resolved the class.
106 if (this_oop->tag_at(which).is_klass()) {
107 CLEAR_PENDING_EXCEPTION;
108 entry = this_oop->resolved_klass_at(which);
109 return (klassOop)entry;
110 }
111
112 if (!PENDING_EXCEPTION->
113 is_a(SystemDictionary::LinkageError_klass())) {
114 // Just throw the exception and don't prevent these classes from
115 // being loaded due to virtual machine errors like StackOverflow
116 // and OutOfMemoryError, etc, or if the thread was hit by stop()
117 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
118 }
119 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
120 SystemDictionary::add_resolution_error(this_oop, which, error);
121 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
122 } else {
123 // some other thread has put the class in error state.
124 error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which));
125 assert(!error.is_null(), "checking");
126 throw_orig_error = true;
127 }
128 } // unlocked
129
130 if (throw_orig_error) {
131 CLEAR_PENDING_EXCEPTION;
132 ResourceMark rm;
133 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
134 THROW_MSG_0(error, className);
135 }
136
137 return 0;
138 }
139
140 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
141 // skip resolving the constant pool so that this code get's
142 // called the next time some bytecodes refer to this class.
143 ResourceMark rm;
144 int line_number = -1;
145 const char * source_file = NULL;
146 if (JavaThread::current()->has_last_Java_frame()) {
147 // try to identify the method which called this function.
148 vframeStream vfst(JavaThread::current());
149 if (!vfst.at_end()) {
150 line_number = vfst.method()->line_number_from_bci(vfst.bci());
151 symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
152 if (s != NULL) {
153 source_file = s->as_C_string();
154 }
155 }
156 }
157 if (k() != this_oop->pool_holder()) {
158 // only print something if the classes are different
159 if (source_file != NULL) {
160 tty->print("RESOLVE %s %s %s:%d\n",
161 instanceKlass::cast(this_oop->pool_holder())->external_name(),
162 instanceKlass::cast(k())->external_name(), source_file, line_number);
163 } else {
164 tty->print("RESOLVE %s %s\n",
165 instanceKlass::cast(this_oop->pool_holder())->external_name(),
166 instanceKlass::cast(k())->external_name());
167 }
168 }
169 return k();
170 } else {
171 ObjectLocker ol (this_oop, THREAD);
172 // Only updated constant pool - if it is resolved.
173 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
174 if (do_resolve) {
175 this_oop->klass_at_put(which, k());
176 }
177 }
178 }
179
180 entry = this_oop->resolved_klass_at(which);
181 assert(entry->is_klass(), "must be resolved at this point");
182 return (klassOop)entry;
183 }
184
185
186 // Does not update constantPoolOop - to avoid any exception throwing. Used
187 // by compiler and exception handling. Also used to avoid classloads for
188 // instanceof operations. Returns NULL if the class has not been loaded or
189 // if the verification of constant pool failed
190 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
191 oop entry = *this_oop->obj_at_addr(which);
192 if (entry->is_klass()) {
193 return (klassOop)entry;
194 } else {
195 assert(entry->is_symbol(), "must be either symbol or klass");
196 Thread *thread = Thread::current();
197 symbolHandle name (thread, (symbolOop)entry);
198 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
199 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
200 Handle h_prot (thread, protection_domain);
201 Handle h_loader (thread, loader);
202 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
203
204 if (k != NULL) {
205 // Make sure that resolving is legal
206 EXCEPTION_MARK;
207 KlassHandle klass(THREAD, k);
208 // return NULL if verification fails
209 verify_constant_pool_resolve(this_oop, klass, THREAD);
210 if (HAS_PENDING_EXCEPTION) {
211 CLEAR_PENDING_EXCEPTION;
212 return NULL;
213 }
214 return klass();
215 } else {
216 return k;
217 }
218 }
219 }
220
221
222 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
223 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
224 }
225
226
227 // This is an interface for the compiler that allows accessing non-resolved entries
228 // in the constant pool - but still performs the validations tests. Must be used
229 // in a pre-parse of the compiler - to determine what it can do and not do.
230 // Note: We cannot update the ConstantPool from the vm_thread.
231 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
232 int which = this_oop->klass_ref_index_at(index);
233 oop entry = *this_oop->obj_at_addr(which);
234 if (entry->is_klass()) {
235 return (klassOop)entry;
236 } else {
237 assert(entry->is_symbol(), "must be either symbol or klass");
238 symbolHandle name (THREAD, (symbolOop)entry);
239 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
240 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
241 Handle h_loader(THREAD, loader);
242 Handle h_prot (THREAD, protection_domain);
243 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
244
245 // Do access check for klasses
246 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
247 return k();
248 }
249 }
250
251
252 symbolOop constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
253 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
254 return symbol_at(name_index);
255 }
256
257
258 symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
259 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
260 return symbol_at(signature_index);
261 }
262
263
264 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
265 int i = which;
266 if (!uncached && cache() != NULL) {
267 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
268 // Invokedynamic indexes are always processed in native order
269 // so there is no question of reading a native u2 in Java order here.
270 int pool_index = cache()->main_entry_at(which)->constant_pool_index();
271 if (tag_at(pool_index).is_invoke_dynamic())
272 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
273 assert(tag_at(pool_index).is_name_and_type(), "");
274 return pool_index;
275 }
276 // change byte-ordering and go via cache
277 i = remap_instruction_operand_from_cache(which);
278 } else {
279 if (tag_at(which).is_name_and_type())
280 // invokedynamic index is a simple name-and-type
281 return which;
282 }
283 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
284 jint ref_index = *int_at_addr(i);
285 return extract_high_short_from_int(ref_index);
286 }
287
288
289 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
290 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
291 "an invokedynamic instruction does not have a klass");
292 int i = which;
293 if (!uncached && cache() != NULL) {
294 // change byte-ordering and go via cache
295 i = remap_instruction_operand_from_cache(which);
296 }
297 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
298 jint ref_index = *int_at_addr(i);
299 return extract_low_short_from_int(ref_index);
300 }
301
302
303
304 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
305 int cpc_index = operand;
306 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
307 assert((int)(u2)cpc_index == cpc_index, "clean u2");
308 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
309 return member_index;
310 }
311
312
313 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
314 if (k->oop_is_instance() || k->oop_is_objArray()) {
315 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
316 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
317 KlassHandle element (THREAD, elem_oop);
318
319 // The element type could be a typeArray - we only need the access check if it is
320 // an reference to another class
321 if (element->oop_is_instance()) {
322 LinkResolver::check_klass_accessability(holder, element, CHECK);
323 }
324 }
325 }
326
327
328 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
329 jint ref_index = name_and_type_at(which_nt);
330 return extract_low_short_from_int(ref_index);
331 }
332
333
334 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
335 jint ref_index = name_and_type_at(which_nt);
336 return extract_high_short_from_int(ref_index);
337 }
338
339
340 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
341 return klass_at(klass_ref_index_at(which), CHECK_NULL);
342 }
343
344
345 symbolOop constantPoolOopDesc::klass_name_at(int which) {
346 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
347 "Corrupted constant pool");
348 // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
349 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
350 // tag is not updated atomicly.
351 oop entry = *(obj_at_addr(which));
352 if (entry->is_klass()) {
353 // Already resolved - return entry's name.
354 return klassOop(entry)->klass_part()->name();
355 } else {
356 assert(entry->is_symbol(), "must be either symbol or klass");
357 return (symbolOop)entry;
358 }
359 }
360
361 symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) {
362 jint ref_index = klass_ref_index_at(which);
363 return klass_at_noresolve(ref_index);
364 }
365
366 symbolOop constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) {
367 jint ref_index = uncached_klass_ref_index_at(which);
368 return klass_at_noresolve(ref_index);
369 }
370
371 char* constantPoolOopDesc::string_at_noresolve(int which) {
372 // Test entry type in case string is resolved while in here.
373 oop entry = *(obj_at_addr(which));
374 if (entry->is_symbol()) {
375 return ((symbolOop)entry)->as_C_string();
376 } else if (java_lang_String::is_instance(entry)) {
377 return java_lang_String::as_utf8_string(entry);
378 } else {
379 return (char*)"<pseudo-string>";
380 }
381 }
382
383
384 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
385 return FieldType::basic_type(symbol_at(which));
386 }
387
388
389 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
390 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
391 if (this_oop->tag_at(index).is_unresolved_string()) {
392 this_oop->string_at(index, CHECK);
393 }
394 }
395 }
396
397 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
398 oop result_oop = NULL;
399 if (cache_index >= 0) {
400 assert(index < 0, "only one kind of index at a time");
401 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
402 result_oop = cpc_entry->f1();
403 if (result_oop != NULL) {
404 return result_oop; // that was easy...
405 }
406 index = cpc_entry->constant_pool_index();
407 }
408
409 int tag_value = this_oop->tag_at(index).value();
410 switch (tag_value) {
411
412 case JVM_CONSTANT_UnresolvedClass:
413 case JVM_CONSTANT_UnresolvedClassInError:
414 case JVM_CONSTANT_Class:
415 {
416 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL);
417 // ldc wants the java mirror.
418 result_oop = resolved->klass_part()->java_mirror();
419 break;
420 }
421
422 case JVM_CONSTANT_String:
423 case JVM_CONSTANT_UnresolvedString:
424 if (this_oop->is_pseudo_string_at(index)) {
425 result_oop = this_oop->pseudo_string_at(index);
426 break;
427 }
428 result_oop = string_at_impl(this_oop, index, CHECK_NULL);
429 break;
430
431 case JVM_CONSTANT_Object:
432 result_oop = this_oop->object_at(index);
433 break;
434
435 case JVM_CONSTANT_MethodHandle:
436 {
437 int ref_kind = this_oop->method_handle_ref_kind_at(index);
438 int callee_index = this_oop->method_handle_klass_index_at(index);
439 symbolHandle name(THREAD, this_oop->method_handle_name_ref_at(index));
440 symbolHandle signature(THREAD, this_oop->method_handle_signature_ref_at(index));
441 if (PrintMiscellaneous)
442 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
443 ref_kind, index, this_oop->method_handle_index_at(index),
444 callee_index, name->as_C_string(), signature->as_C_string());
445 KlassHandle callee;
446 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
447 callee = KlassHandle(THREAD, k);
448 }
449 KlassHandle klass(THREAD, this_oop->pool_holder());
450 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
451 callee, name, signature,
452 CHECK_NULL);
453 result_oop = value();
454 // FIXME: Uniquify errors, using SystemDictionary::find_resolution_error.
455 break;
456 }
457
458 case JVM_CONSTANT_MethodType:
459 {
460 symbolHandle signature(THREAD, this_oop->method_type_signature_at(index));
461 if (PrintMiscellaneous)
462 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
463 index, this_oop->method_type_index_at(index),
464 signature->as_C_string());
465 KlassHandle klass(THREAD, this_oop->pool_holder());
466 bool ignore_is_on_bcp = false;
467 Handle value = SystemDictionary::find_method_handle_type(signature,
468 klass,
469 false,
470 ignore_is_on_bcp,
471 CHECK_NULL);
472 result_oop = value();
473 // FIXME: Uniquify errors, using SystemDictionary::find_resolution_error.
474 break;
475 }
476
477 /* maybe some day
478 case JVM_CONSTANT_Integer:
479 case JVM_CONSTANT_Float:
480 case JVM_CONSTANT_Long:
481 case JVM_CONSTANT_Double:
482 result_oop = java_lang_boxing_object::create(...);
483 break;
484 */
485
486 default:
487 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
488 this_oop(), index, cache_index, tag_value) );
489 assert(false, "unexpected constant tag");
490 break;
491 }
492
493 if (cache_index >= 0) {
494 // Cache the oop here also.
495 Handle result(THREAD, result_oop);
496 result_oop = NULL; // safety
497 ObjectLocker ol(this_oop, THREAD);
498 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
499 oop result_oop2 = cpc_entry->f1();
500 if (result_oop2 != NULL) {
501 // Race condition: May already be filled in while we were trying to lock.
502 return result_oop2;
503 }
504 cpc_entry->set_f1(result());
505 return result();
506 } else {
507 return result_oop;
508 }
509 }
510
511 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
512 oop entry = *(this_oop->obj_at_addr(which));
513 if (entry->is_symbol()) {
514 ObjectLocker ol(this_oop, THREAD);
515 if (this_oop->tag_at(which).is_unresolved_string()) {
516 // Intern string
517 symbolOop sym = this_oop->unresolved_string_at(which);
518 entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
519 this_oop->string_at_put(which, entry);
520 } else {
521 // Another thread beat us and interned string, read string from constant pool
522 entry = this_oop->resolved_string_at(which);
523 }
524 }
525 assert(java_lang_String::is_instance(entry), "must be string");
526 return entry;
527 }
528
529
530 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
531 oop entry = *(obj_at_addr(which));
532 if (entry->is_symbol())
533 // Not yet resolved, but it will resolve to a string.
534 return false;
535 else if (java_lang_String::is_instance(entry))
536 return false; // actually, it might be a non-interned or non-perm string
537 else
538 // truly pseudo
539 return true;
540 }
541
542
543 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
544 int which) {
545 // Names are interned, so we can compare symbolOops directly
546 symbolOop cp_name = klass_name_at(which);
547 return (cp_name == k->name());
548 }
549
550
551 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
552 ResourceMark rm;
553 int count = 0;
554 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
555 if (tag_at(index).is_unresolved_string()) {
556 // Intern string
557 symbolOop sym = unresolved_string_at(index);
558 oop entry = StringTable::intern(sym, CHECK_(-1));
559 string_at_put(index, entry);
560 }
561 }
562 return count;
563 }
564
565
566 // Iterate over symbols which are used as class, field, method names and
567 // signatures (in preparation for writing to the shared archive).
568
569 void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
570 for (int index = 1; index < length(); index++) { // Index 0 is unused
571 switch (tag_at(index).value()) {
572
573 case JVM_CONSTANT_UnresolvedClass:
574 closure->do_oop(obj_at_addr(index));
575 break;
576
577 case JVM_CONSTANT_NameAndType:
578 {
579 int i = *int_at_addr(index);
580 closure->do_oop(obj_at_addr((unsigned)i >> 16));
581 closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
582 }
583 break;
584
585 case JVM_CONSTANT_Class:
586 case JVM_CONSTANT_InterfaceMethodref:
587 case JVM_CONSTANT_Fieldref:
588 case JVM_CONSTANT_Methodref:
589 case JVM_CONSTANT_Integer:
590 case JVM_CONSTANT_Float:
591 // Do nothing! Not an oop.
592 // These constant types do not reference symbols at this point.
593 break;
594
595 case JVM_CONSTANT_String:
596 // Do nothing! Not a symbol.
597 break;
598
599 case JVM_CONSTANT_UnresolvedString:
600 case JVM_CONSTANT_Utf8:
601 // These constants are symbols, but unless these symbols are
602 // actually to be used for something, we don't want to mark them.
603 break;
604
605 case JVM_CONSTANT_Long:
606 case JVM_CONSTANT_Double:
607 // Do nothing! Not an oop. (But takes two pool entries.)
608 ++index;
609 break;
610
611 default:
612 ShouldNotReachHere();
613 break;
614 }
615 }
616 }
617
618
619 // Iterate over the [one] tags array (in preparation for writing to the
620 // shared archive).
621
622 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
623 closure->do_oop(tags_addr());
624 }
625
626
627 // Iterate over String objects (in preparation for writing to the shared
628 // archive).
629
630 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
631 for (int index = 1; index < length(); index++) { // Index 0 is unused
632 switch (tag_at(index).value()) {
633
634 case JVM_CONSTANT_UnresolvedClass:
635 case JVM_CONSTANT_NameAndType:
636 // Do nothing! Not a String.
637 break;
638
639 case JVM_CONSTANT_Class:
640 case JVM_CONSTANT_InterfaceMethodref:
641 case JVM_CONSTANT_Fieldref:
642 case JVM_CONSTANT_Methodref:
643 case JVM_CONSTANT_Integer:
644 case JVM_CONSTANT_Float:
645 // Do nothing! Not an oop.
646 // These constant types do not reference symbols at this point.
647 break;
648
649 case JVM_CONSTANT_String:
650 closure->do_oop(obj_at_addr(index));
651 break;
652
653 case JVM_CONSTANT_UnresolvedString:
654 case JVM_CONSTANT_Utf8:
655 // These constants are symbols, but unless these symbols are
656 // actually to be used for something, we don't want to mark them.
657 break;
658
659 case JVM_CONSTANT_Long:
660 case JVM_CONSTANT_Double:
661 // Do nothing! Not an oop. (But takes two pool entries.)
662 ++index;
663 break;
664
665 default:
666 ShouldNotReachHere();
667 break;
668 }
669 }
670 }
671
672
673 // Compare this constant pool's entry at index1 to the constant pool
674 // cp2's entry at index2.
675 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
676 int index2, TRAPS) {
677
678 jbyte t1 = tag_at(index1).value();
679 jbyte t2 = cp2->tag_at(index2).value();
680
681
682 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
683 // when comparing
684 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
685 t1 = JVM_CONSTANT_UnresolvedClass;
686 }
687 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
688 t2 = JVM_CONSTANT_UnresolvedClass;
689 }
690
691 if (t1 != t2) {
692 // Not the same entry type so there is nothing else to check. Note
693 // that this style of checking will consider resolved/unresolved
694 // class pairs and resolved/unresolved string pairs as different.
695 // From the constantPoolOop API point of view, this is correct
696 // behavior. See constantPoolKlass::merge() to see how this plays
697 // out in the context of constantPoolOop merging.
698 return false;
699 }
700
701 switch (t1) {
702 case JVM_CONSTANT_Class:
703 {
704 klassOop k1 = klass_at(index1, CHECK_false);
705 klassOop k2 = cp2->klass_at(index2, CHECK_false);
706 if (k1 == k2) {
707 return true;
708 }
709 } break;
710
711 case JVM_CONSTANT_ClassIndex:
712 {
713 int recur1 = klass_index_at(index1);
714 int recur2 = cp2->klass_index_at(index2);
715 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
716 if (match) {
717 return true;
718 }
719 } break;
720
721 case JVM_CONSTANT_Double:
722 {
723 jdouble d1 = double_at(index1);
724 jdouble d2 = cp2->double_at(index2);
725 if (d1 == d2) {
726 return true;
727 }
728 } break;
729
730 case JVM_CONSTANT_Fieldref:
731 case JVM_CONSTANT_InterfaceMethodref:
732 case JVM_CONSTANT_Methodref:
733 {
734 int recur1 = uncached_klass_ref_index_at(index1);
735 int recur2 = cp2->uncached_klass_ref_index_at(index2);
736 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
737 if (match) {
738 recur1 = uncached_name_and_type_ref_index_at(index1);
739 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
740 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
741 if (match) {
742 return true;
743 }
744 }
745 } break;
746
747 case JVM_CONSTANT_Float:
748 {
749 jfloat f1 = float_at(index1);
750 jfloat f2 = cp2->float_at(index2);
751 if (f1 == f2) {
752 return true;
753 }
754 } break;
755
756 case JVM_CONSTANT_Integer:
757 {
758 jint i1 = int_at(index1);
759 jint i2 = cp2->int_at(index2);
760 if (i1 == i2) {
761 return true;
762 }
763 } break;
764
765 case JVM_CONSTANT_Long:
766 {
767 jlong l1 = long_at(index1);
768 jlong l2 = cp2->long_at(index2);
769 if (l1 == l2) {
770 return true;
771 }
772 } break;
773
774 case JVM_CONSTANT_NameAndType:
775 {
776 int recur1 = name_ref_index_at(index1);
777 int recur2 = cp2->name_ref_index_at(index2);
778 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
779 if (match) {
780 recur1 = signature_ref_index_at(index1);
781 recur2 = cp2->signature_ref_index_at(index2);
782 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
783 if (match) {
784 return true;
785 }
786 }
787 } break;
788
789 case JVM_CONSTANT_String:
790 {
791 oop s1 = string_at(index1, CHECK_false);
792 oop s2 = cp2->string_at(index2, CHECK_false);
793 if (s1 == s2) {
794 return true;
795 }
796 } break;
797
798 case JVM_CONSTANT_StringIndex:
799 {
800 int recur1 = string_index_at(index1);
801 int recur2 = cp2->string_index_at(index2);
802 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
803 if (match) {
804 return true;
805 }
806 } break;
807
808 case JVM_CONSTANT_UnresolvedClass:
809 {
810 symbolOop k1 = unresolved_klass_at(index1);
811 symbolOop k2 = cp2->unresolved_klass_at(index2);
812 if (k1 == k2) {
813 return true;
814 }
815 } break;
816
817 case JVM_CONSTANT_MethodType:
818 {
819 int k1 = method_type_index_at(index1);
820 int k2 = cp2->method_type_index_at(index2);
821 if (k1 == k2) {
822 return true;
823 }
824 } break;
825
826 case JVM_CONSTANT_MethodHandle:
827 {
828 int k1 = method_handle_ref_kind_at(index1);
829 int k2 = cp2->method_handle_ref_kind_at(index2);
830 if (k1 == k2) {
831 int i1 = method_handle_index_at(index1);
832 int i2 = cp2->method_handle_index_at(index2);
833 if (i1 == i2) {
834 return true;
835 }
836 }
837 } break;
838
839 case JVM_CONSTANT_InvokeDynamic:
840 {
841 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
842 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
843 if (k1 == k2) {
844 int i1 = invoke_dynamic_name_and_type_ref_index_at(index1);
845 int i2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
846 if (i1 == i2) {
847 return true;
848 }
849 }
850 } break;
851
852 case JVM_CONSTANT_UnresolvedString:
853 {
854 symbolOop s1 = unresolved_string_at(index1);
855 symbolOop s2 = cp2->unresolved_string_at(index2);
856 if (s1 == s2) {
857 return true;
858 }
859 } break;
860
861 case JVM_CONSTANT_Utf8:
862 {
863 symbolOop s1 = symbol_at(index1);
864 symbolOop s2 = cp2->symbol_at(index2);
865 if (s1 == s2) {
866 return true;
867 }
868 } break;
869
870 // Invalid is used as the tag for the second constant pool entry
871 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
872 // not be seen by itself.
873 case JVM_CONSTANT_Invalid: // fall through
874
875 default:
876 ShouldNotReachHere();
877 break;
878 }
879
880 return false;
881 } // end compare_entry_to()
882
883
884 // Copy this constant pool's entries at start_i to end_i (inclusive)
885 // to the constant pool to_cp's entries starting at to_i. A total of
886 // (end_i - start_i) + 1 entries are copied.
887 void constantPoolOopDesc::copy_cp_to(int start_i, int end_i,
888 constantPoolHandle to_cp, int to_i, TRAPS) {
889
890 int dest_i = to_i; // leave original alone for debug purposes
891
892 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
893 copy_entry_to(src_i, to_cp, dest_i, CHECK);
894
895 switch (tag_at(src_i).value()) {
896 case JVM_CONSTANT_Double:
897 case JVM_CONSTANT_Long:
898 // double and long take two constant pool entries
899 src_i += 2;
900 dest_i += 2;
901 break;
902
903 default:
904 // all others take one constant pool entry
905 src_i++;
906 dest_i++;
907 break;
908 }
909 }
910 } // end copy_cp_to()
911
912
913 // Copy this constant pool's entry at from_i to the constant pool
914 // to_cp's entry at to_i.
915 void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp,
916 int to_i, TRAPS) {
917
918 switch (tag_at(from_i).value()) {
919 case JVM_CONSTANT_Class:
920 {
921 klassOop k = klass_at(from_i, CHECK);
922 to_cp->klass_at_put(to_i, k);
923 } break;
924
925 case JVM_CONSTANT_ClassIndex:
926 {
927 jint ki = klass_index_at(from_i);
928 to_cp->klass_index_at_put(to_i, ki);
929 } break;
930
931 case JVM_CONSTANT_Double:
932 {
933 jdouble d = double_at(from_i);
934 to_cp->double_at_put(to_i, d);
935 // double takes two constant pool entries so init second entry's tag
936 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
937 } break;
938
939 case JVM_CONSTANT_Fieldref:
940 {
941 int class_index = uncached_klass_ref_index_at(from_i);
942 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
943 to_cp->field_at_put(to_i, class_index, name_and_type_index);
944 } break;
945
946 case JVM_CONSTANT_Float:
947 {
948 jfloat f = float_at(from_i);
949 to_cp->float_at_put(to_i, f);
950 } break;
951
952 case JVM_CONSTANT_Integer:
953 {
954 jint i = int_at(from_i);
955 to_cp->int_at_put(to_i, i);
956 } break;
957
958 case JVM_CONSTANT_InterfaceMethodref:
959 {
960 int class_index = uncached_klass_ref_index_at(from_i);
961 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
962 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
963 } break;
964
965 case JVM_CONSTANT_Long:
966 {
967 jlong l = long_at(from_i);
968 to_cp->long_at_put(to_i, l);
969 // long takes two constant pool entries so init second entry's tag
970 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
971 } break;
972
973 case JVM_CONSTANT_Methodref:
974 {
975 int class_index = uncached_klass_ref_index_at(from_i);
976 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
977 to_cp->method_at_put(to_i, class_index, name_and_type_index);
978 } break;
979
980 case JVM_CONSTANT_NameAndType:
981 {
982 int name_ref_index = name_ref_index_at(from_i);
983 int signature_ref_index = signature_ref_index_at(from_i);
984 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
985 } break;
986
987 case JVM_CONSTANT_String:
988 {
989 oop s = string_at(from_i, CHECK);
990 to_cp->string_at_put(to_i, s);
991 } break;
992
993 case JVM_CONSTANT_StringIndex:
994 {
995 jint si = string_index_at(from_i);
996 to_cp->string_index_at_put(to_i, si);
997 } break;
998
999 case JVM_CONSTANT_UnresolvedClass:
1000 {
1001 symbolOop k = unresolved_klass_at(from_i);
1002 to_cp->unresolved_klass_at_put(to_i, k);
1003 } break;
1004
1005 case JVM_CONSTANT_UnresolvedClassInError:
1006 {
1007 symbolOop k = unresolved_klass_at(from_i);
1008 to_cp->unresolved_klass_at_put(to_i, k);
1009 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1010 } break;
1011
1012
1013 case JVM_CONSTANT_UnresolvedString:
1014 {
1015 symbolOop s = unresolved_string_at(from_i);
1016 to_cp->unresolved_string_at_put(to_i, s);
1017 } break;
1018
1019 case JVM_CONSTANT_Utf8:
1020 {
1021 symbolOop s = symbol_at(from_i);
1022 to_cp->symbol_at_put(to_i, s);
1023 } break;
1024
1025 case JVM_CONSTANT_MethodType:
1026 {
1027 jint k = method_type_index_at(from_i);
1028 to_cp->method_type_index_at_put(to_i, k);
1029 } break;
1030
1031 case JVM_CONSTANT_MethodHandle:
1032 {
1033 int k1 = method_handle_ref_kind_at(from_i);
1034 int k2 = method_handle_index_at(from_i);
1035 to_cp->method_handle_index_at_put(to_i, k1, k2);
1036 } break;
1037
1038 case JVM_CONSTANT_InvokeDynamic:
1039 {
1040 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(from_i);
1041 int k2 = invoke_dynamic_name_and_type_ref_index_at(from_i);
1042 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1043 } break;
1044
1045 // Invalid is used as the tag for the second constant pool entry
1046 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1047 // not be seen by itself.
1048 case JVM_CONSTANT_Invalid: // fall through
1049
1050 default:
1051 {
1052 jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb
1053 ShouldNotReachHere();
1054 } break;
1055 }
1056 } // end copy_entry_to()
1057
1058
1059 // Search constant pool search_cp for an entry that matches this
1060 // constant pool's entry at pattern_i. Returns the index of a
1061 // matching entry or zero (0) if there is no matching entry.
1062 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1063 constantPoolHandle search_cp, TRAPS) {
1064
1065 // index zero (0) is not used
1066 for (int i = 1; i < search_cp->length(); i++) {
1067 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1068 if (found) {
1069 return i;
1070 }
1071 }
1072
1073 return 0; // entry not found; return unused index zero (0)
1074 } // end find_matching_entry()
1075
1076
1077 #ifndef PRODUCT
1078
1079 const char* constantPoolOopDesc::printable_name_at(int which) {
1080
1081 constantTag tag = tag_at(which);
1082
1083 if (tag.is_unresolved_string() || tag.is_string()) {
1084 return string_at_noresolve(which);
1085 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1086 return klass_name_at(which)->as_C_string();
1087 } else if (tag.is_symbol()) {
1088 return symbol_at(which)->as_C_string();
1089 }
1090 return "";
1091 }
1092
1093 #endif // PRODUCT
1094
1095
1096 // JVMTI GetConstantPool support
1097
1098 // For temporary use until code is stable.
1099 #define DBG(code)
1100
1101 static const char* WARN_MSG = "Must not be such entry!";
1102
1103 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1104 jint size = 0;
1105 u2 idx1, idx2;
1106
1107 for (jint idx = 1; idx < cnt; idx++) {
1108 jint ent_size = 0;
1109 u1 tag = *bytes++;
1110 size++; // count tag
1111
1112 printf("const #%03d, tag: %02d ", idx, tag);
1113 switch(tag) {
1114 case JVM_CONSTANT_Invalid: {
1115 printf("Invalid");
1116 break;
1117 }
1118 case JVM_CONSTANT_Unicode: {
1119 printf("Unicode %s", WARN_MSG);
1120 break;
1121 }
1122 case JVM_CONSTANT_Utf8: {
1123 u2 len = Bytes::get_Java_u2(bytes);
1124 char str[128];
1125 if (len > 127) {
1126 len = 127;
1127 }
1128 strncpy(str, (char *) (bytes+2), len);
1129 str[len] = '\0';
1130 printf("Utf8 \"%s\"", str);
1131 ent_size = 2 + len;
1132 break;
1133 }
1134 case JVM_CONSTANT_Integer: {
1135 u4 val = Bytes::get_Java_u4(bytes);
1136 printf("int %d", *(int *) &val);
1137 ent_size = 4;
1138 break;
1139 }
1140 case JVM_CONSTANT_Float: {
1141 u4 val = Bytes::get_Java_u4(bytes);
1142 printf("float %5.3ff", *(float *) &val);
1143 ent_size = 4;
1144 break;
1145 }
1146 case JVM_CONSTANT_Long: {
1147 u8 val = Bytes::get_Java_u8(bytes);
1148 printf("long "INT64_FORMAT, *(jlong *) &val);
1149 ent_size = 8;
1150 idx++; // Long takes two cpool slots
1151 break;
1152 }
1153 case JVM_CONSTANT_Double: {
1154 u8 val = Bytes::get_Java_u8(bytes);
1155 printf("double %5.3fd", *(jdouble *)&val);
1156 ent_size = 8;
1157 idx++; // Double takes two cpool slots
1158 break;
1159 }
1160 case JVM_CONSTANT_Class: {
1161 idx1 = Bytes::get_Java_u2(bytes);
1162 printf("class #%03d", idx1);
1163 ent_size = 2;
1164 break;
1165 }
1166 case JVM_CONSTANT_String: {
1167 idx1 = Bytes::get_Java_u2(bytes);
1168 printf("String #%03d", idx1);
1169 ent_size = 2;
1170 break;
1171 }
1172 case JVM_CONSTANT_Fieldref: {
1173 idx1 = Bytes::get_Java_u2(bytes);
1174 idx2 = Bytes::get_Java_u2(bytes+2);
1175 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1176 ent_size = 4;
1177 break;
1178 }
1179 case JVM_CONSTANT_Methodref: {
1180 idx1 = Bytes::get_Java_u2(bytes);
1181 idx2 = Bytes::get_Java_u2(bytes+2);
1182 printf("Method #%03d, #%03d", idx1, idx2);
1183 ent_size = 4;
1184 break;
1185 }
1186 case JVM_CONSTANT_InterfaceMethodref: {
1187 idx1 = Bytes::get_Java_u2(bytes);
1188 idx2 = Bytes::get_Java_u2(bytes+2);
1189 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1190 ent_size = 4;
1191 break;
1192 }
1193 case JVM_CONSTANT_NameAndType: {
1194 idx1 = Bytes::get_Java_u2(bytes);
1195 idx2 = Bytes::get_Java_u2(bytes+2);
1196 printf("NameAndType #%03d, #%03d", idx1, idx2);
1197 ent_size = 4;
1198 break;
1199 }
1200 case JVM_CONSTANT_ClassIndex: {
1201 printf("ClassIndex %s", WARN_MSG);
1202 break;
1203 }
1204 case JVM_CONSTANT_UnresolvedClass: {
1205 printf("UnresolvedClass: %s", WARN_MSG);
1206 break;
1207 }
1208 case JVM_CONSTANT_UnresolvedClassInError: {
1209 printf("UnresolvedClassInErr: %s", WARN_MSG);
1210 break;
1211 }
1212 case JVM_CONSTANT_StringIndex: {
1213 printf("StringIndex: %s", WARN_MSG);
1214 break;
1215 }
1216 case JVM_CONSTANT_UnresolvedString: {
1217 printf("UnresolvedString: %s", WARN_MSG);
1218 break;
1219 }
1220 }
1221 printf(";\n");
1222 bytes += ent_size;
1223 size += ent_size;
1224 }
1225 printf("Cpool size: %d\n", size);
1226 fflush(0);
1227 return;
1228 } /* end print_cpool_bytes */
1229
1230
1231 // Returns size of constant pool entry.
1232 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1233 switch(tag_at(idx).value()) {
1234 case JVM_CONSTANT_Invalid:
1235 case JVM_CONSTANT_Unicode:
1236 return 1;
1237
1238 case JVM_CONSTANT_Utf8:
1239 return 3 + symbol_at(idx)->utf8_length();
1240
1241 case JVM_CONSTANT_Class:
1242 case JVM_CONSTANT_String:
1243 case JVM_CONSTANT_ClassIndex:
1244 case JVM_CONSTANT_UnresolvedClass:
1245 case JVM_CONSTANT_UnresolvedClassInError:
1246 case JVM_CONSTANT_StringIndex:
1247 case JVM_CONSTANT_UnresolvedString:
1248 case JVM_CONSTANT_MethodType:
1249 return 3;
1250
1251 case JVM_CONSTANT_MethodHandle:
1252 return 4; //tag, ref_kind, ref_index
1253
1254 case JVM_CONSTANT_Integer:
1255 case JVM_CONSTANT_Float:
1256 case JVM_CONSTANT_Fieldref:
1257 case JVM_CONSTANT_Methodref:
1258 case JVM_CONSTANT_InterfaceMethodref:
1259 case JVM_CONSTANT_NameAndType:
1260 case JVM_CONSTANT_InvokeDynamic:
1261 return 5;
1262
1263 case JVM_CONSTANT_Long:
1264 case JVM_CONSTANT_Double:
1265 return 9;
1266 }
1267 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1268 return 1;
1269 } /* end cpool_entry_size */
1270
1271
1272 // SymbolHashMap is used to find a constant pool index from a string.
1273 // This function fills in SymbolHashMaps, one for utf8s and one for
1274 // class names, returns size of the cpool raw bytes.
1275 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1276 SymbolHashMap *classmap) {
1277 jint size = 0;
1278
1279 for (u2 idx = 1; idx < length(); idx++) {
1280 u2 tag = tag_at(idx).value();
1281 size += cpool_entry_size(idx);
1282
1283 switch(tag) {
1284 case JVM_CONSTANT_Utf8: {
1285 symbolOop sym = symbol_at(idx);
1286 symmap->add_entry(sym, idx);
1287 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1288 break;
1289 }
1290 case JVM_CONSTANT_Class:
1291 case JVM_CONSTANT_UnresolvedClass:
1292 case JVM_CONSTANT_UnresolvedClassInError: {
1293 symbolOop sym = klass_name_at(idx);
1294 classmap->add_entry(sym, idx);
1295 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1296 break;
1297 }
1298 case JVM_CONSTANT_Long:
1299 case JVM_CONSTANT_Double: {
1300 idx++; // Both Long and Double take two cpool slots
1301 break;
1302 }
1303 }
1304 }
1305 return size;
1306 } /* end hash_utf8_entries_to */
1307
1308
1309 // Copy cpool bytes.
1310 // Returns:
1311 // 0, in case of OutOfMemoryError
1312 // -1, in case of internal error
1313 // > 0, count of the raw cpool bytes that have been copied
1314 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1315 SymbolHashMap* tbl,
1316 unsigned char *bytes) {
1317 u2 idx1, idx2;
1318 jint size = 0;
1319 jint cnt = length();
1320 unsigned char *start_bytes = bytes;
1321
1322 for (jint idx = 1; idx < cnt; idx++) {
1323 u1 tag = tag_at(idx).value();
1324 jint ent_size = cpool_entry_size(idx);
1325
1326 assert(size + ent_size <= cpool_size, "Size mismatch");
1327
1328 *bytes = tag;
1329 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1330 switch(tag) {
1331 case JVM_CONSTANT_Invalid: {
1332 DBG(printf("JVM_CONSTANT_Invalid"));
1333 break;
1334 }
1335 case JVM_CONSTANT_Unicode: {
1336 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1337 DBG(printf("JVM_CONSTANT_Unicode"));
1338 break;
1339 }
1340 case JVM_CONSTANT_Utf8: {
1341 symbolOop sym = symbol_at(idx);
1342 char* str = sym->as_utf8();
1343 // Warning! It's crashing on x86 with len = sym->utf8_length()
1344 int len = (int) strlen(str);
1345 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1346 for (int i = 0; i < len; i++) {
1347 bytes[3+i] = (u1) str[i];
1348 }
1349 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1350 break;
1351 }
1352 case JVM_CONSTANT_Integer: {
1353 jint val = int_at(idx);
1354 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1355 break;
1356 }
1357 case JVM_CONSTANT_Float: {
1358 jfloat val = float_at(idx);
1359 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1360 break;
1361 }
1362 case JVM_CONSTANT_Long: {
1363 jlong val = long_at(idx);
1364 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1365 idx++; // Long takes two cpool slots
1366 break;
1367 }
1368 case JVM_CONSTANT_Double: {
1369 jdouble val = double_at(idx);
1370 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1371 idx++; // Double takes two cpool slots
1372 break;
1373 }
1374 case JVM_CONSTANT_Class:
1375 case JVM_CONSTANT_UnresolvedClass:
1376 case JVM_CONSTANT_UnresolvedClassInError: {
1377 *bytes = JVM_CONSTANT_Class;
1378 symbolOop sym = klass_name_at(idx);
1379 idx1 = tbl->symbol_to_value(sym);
1380 assert(idx1 != 0, "Have not found a hashtable entry");
1381 Bytes::put_Java_u2((address) (bytes+1), idx1);
1382 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1383 break;
1384 }
1385 case JVM_CONSTANT_String: {
1386 unsigned int hash;
1387 char *str = string_at_noresolve(idx);
1388 symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1389 if (sym == NULL) {
1390 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1391 // this can happen with JVM TI; see CR 6839599 for more details
1392 oop string = *(obj_at_addr(idx));
1393 assert(java_lang_String::is_instance(string),"Not a String");
1394 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1395 idx1 = 0;
1396 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1397 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1398 int length;
1399 sym = cur->symbol();
1400 jchar* chars = sym->as_unicode(length);
1401 if (java_lang_String::equals(string, chars, length)) {
1402 idx1 = cur->value();
1403 DBG(printf("Index found: %d\n",idx1));
1404 break;
1405 }
1406 }
1407 }
1408 } else {
1409 idx1 = tbl->symbol_to_value(sym);
1410 }
1411 assert(idx1 != 0, "Have not found a hashtable entry");
1412 Bytes::put_Java_u2((address) (bytes+1), idx1);
1413 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1414 break;
1415 }
1416 case JVM_CONSTANT_UnresolvedString: {
1417 *bytes = JVM_CONSTANT_String;
1418 symbolOop sym = unresolved_string_at(idx);
1419 idx1 = tbl->symbol_to_value(sym);
1420 assert(idx1 != 0, "Have not found a hashtable entry");
1421 Bytes::put_Java_u2((address) (bytes+1), idx1);
1422 DBG(char *str = sym->as_utf8());
1423 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1424 break;
1425 }
1426 case JVM_CONSTANT_Fieldref:
1427 case JVM_CONSTANT_Methodref:
1428 case JVM_CONSTANT_InterfaceMethodref: {
1429 idx1 = uncached_klass_ref_index_at(idx);
1430 idx2 = uncached_name_and_type_ref_index_at(idx);
1431 Bytes::put_Java_u2((address) (bytes+1), idx1);
1432 Bytes::put_Java_u2((address) (bytes+3), idx2);
1433 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1434 break;
1435 }
1436 case JVM_CONSTANT_NameAndType: {
1437 idx1 = name_ref_index_at(idx);
1438 idx2 = signature_ref_index_at(idx);
1439 Bytes::put_Java_u2((address) (bytes+1), idx1);
1440 Bytes::put_Java_u2((address) (bytes+3), idx2);
1441 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1442 break;
1443 }
1444 case JVM_CONSTANT_ClassIndex: {
1445 *bytes = JVM_CONSTANT_Class;
1446 idx1 = klass_index_at(idx);
1447 Bytes::put_Java_u2((address) (bytes+1), idx1);
1448 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1449 break;
1450 }
1451 case JVM_CONSTANT_StringIndex: {
1452 *bytes = JVM_CONSTANT_String;
1453 idx1 = string_index_at(idx);
1454 Bytes::put_Java_u2((address) (bytes+1), idx1);
1455 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1456 break;
1457 }
1458 case JVM_CONSTANT_MethodHandle: {
1459 *bytes = JVM_CONSTANT_MethodHandle;
1460 int kind = method_handle_ref_kind_at(idx);
1461 idx1 = method_handle_index_at(idx);
1462 *(bytes+1) = (unsigned char) kind;
1463 Bytes::put_Java_u2((address) (bytes+2), idx1);
1464 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1465 break;
1466 }
1467 case JVM_CONSTANT_MethodType: {
1468 *bytes = JVM_CONSTANT_MethodType;
1469 idx1 = method_type_index_at(idx);
1470 Bytes::put_Java_u2((address) (bytes+1), idx1);
1471 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1472 break;
1473 }
1474 case JVM_CONSTANT_InvokeDynamic: {
1475 *bytes = JVM_CONSTANT_InvokeDynamic;
1476 idx1 = invoke_dynamic_bootstrap_method_ref_index_at(idx);
1477 idx2 = invoke_dynamic_name_and_type_ref_index_at(idx);
1478 Bytes::put_Java_u2((address) (bytes+1), idx1);
1479 Bytes::put_Java_u2((address) (bytes+3), idx2);
1480 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1481 break;
1482 }
1483 }
1484 DBG(printf("\n"));
1485 bytes += ent_size;
1486 size += ent_size;
1487 }
1488 assert(size == cpool_size, "Size mismatch");
1489
1490 // Keep temorarily for debugging until it's stable.
1491 DBG(print_cpool_bytes(cnt, start_bytes));
1492 return (int)(bytes - start_bytes);
1493 } /* end copy_cpool_bytes */
1494
1495
1496 void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
1497 char *str = sym->as_utf8();
1498 unsigned int hash = compute_hash(str, sym->utf8_length());
1499 unsigned int index = hash % table_size();
1500
1501 // check if already in map
1502 // we prefer the first entry since it is more likely to be what was used in
1503 // the class file
1504 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1505 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1506 if (en->hash() == hash && en->symbol() == sym) {
1507 return; // already there
1508 }
1509 }
1510
1511 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1512 entry->set_next(bucket(index));
1513 _buckets[index].set_entry(entry);
1514 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1515 }
1516
1517 SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
1518 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1519 char *str = sym->as_utf8();
1520 int len = sym->utf8_length();
1521 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1522 unsigned int index = hash % table_size();
1523 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1524 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1525 if (en->hash() == hash && en->symbol() == sym) {
1526 return en;
1527 }
1528 }
1529 return NULL;
1530 }