Thu, 15 Jul 2010 18:40:45 -0700
6964498: JSR 292 invokedynamic sites need local bootstrap methods
Summary: Add JVM_CONSTANT_InvokeDynamic records to constant pool to determine per-instruction BSMs.
Reviewed-by: twisti
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
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7 * published by the Free Software Foundation.
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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).
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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.
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21 * questions.
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23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_constantPoolOop.cpp.incl"
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 }
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 }
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;
56 symbolHandle name;
57 Handle loader;
58 { ObjectLocker ol(this_oop, THREAD);
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
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 }
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 }
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());
101 bool throw_orig_error = false;
102 {
103 ObjectLocker ol (this_oop, THREAD);
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 }
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
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 }
137 return 0;
138 }
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 }
180 entry = this_oop->resolved_klass_at(which);
181 assert(entry->is_klass(), "must be resolved at this point");
182 return (klassOop)entry;
183 }
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);
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 }
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 }
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));
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 }
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 }
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 }
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 }
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 }
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 }
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);
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 }
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 }
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 }
340 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
341 return klass_at(klass_ref_index_at(which), CHECK_NULL);
342 }
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 }
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 }
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 }
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 }
384 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
385 return FieldType::basic_type(symbol_at(which));
386 }
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 }
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 }
409 int tag_value = this_oop->tag_at(index).value();
410 switch (tag_value) {
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 }
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;
431 case JVM_CONSTANT_Object:
432 result_oop = this_oop->object_at(index);
433 break;
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 }
458 case JVM_CONSTANT_MethodType:
459 {
460 symbolHandle signature(THREAD, this_oop->method_type_signature_at(index));
461 if (PrintMiscellaneous)
462 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
463 index, this_oop->method_type_index_at(index),
464 signature->as_C_string());
465 KlassHandle klass(THREAD, this_oop->pool_holder());
466 bool ignore_is_on_bcp = false;
467 Handle value = SystemDictionary::find_method_handle_type(signature,
468 klass,
469 ignore_is_on_bcp,
470 CHECK_NULL);
471 result_oop = value();
472 // FIXME: Uniquify errors, using SystemDictionary::find_resolution_error.
473 break;
474 }
476 /* maybe some day
477 case JVM_CONSTANT_Integer:
478 case JVM_CONSTANT_Float:
479 case JVM_CONSTANT_Long:
480 case JVM_CONSTANT_Double:
481 result_oop = java_lang_boxing_object::create(...);
482 break;
483 */
485 default:
486 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
487 this_oop(), index, cache_index, tag_value) );
488 assert(false, "unexpected constant tag");
489 break;
490 }
492 if (cache_index >= 0) {
493 // Cache the oop here also.
494 Handle result(THREAD, result_oop);
495 result_oop = NULL; // safety
496 ObjectLocker ol(this_oop, THREAD);
497 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
498 oop result_oop2 = cpc_entry->f1();
499 if (result_oop2 != NULL) {
500 // Race condition: May already be filled in while we were trying to lock.
501 return result_oop2;
502 }
503 cpc_entry->set_f1(result());
504 return result();
505 } else {
506 return result_oop;
507 }
508 }
510 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
511 oop entry = *(this_oop->obj_at_addr(which));
512 if (entry->is_symbol()) {
513 ObjectLocker ol(this_oop, THREAD);
514 if (this_oop->tag_at(which).is_unresolved_string()) {
515 // Intern string
516 symbolOop sym = this_oop->unresolved_string_at(which);
517 entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
518 this_oop->string_at_put(which, entry);
519 } else {
520 // Another thread beat us and interned string, read string from constant pool
521 entry = this_oop->resolved_string_at(which);
522 }
523 }
524 assert(java_lang_String::is_instance(entry), "must be string");
525 return entry;
526 }
529 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
530 oop entry = *(obj_at_addr(which));
531 if (entry->is_symbol())
532 // Not yet resolved, but it will resolve to a string.
533 return false;
534 else if (java_lang_String::is_instance(entry))
535 return false; // actually, it might be a non-interned or non-perm string
536 else
537 // truly pseudo
538 return true;
539 }
542 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
543 int which) {
544 // Names are interned, so we can compare symbolOops directly
545 symbolOop cp_name = klass_name_at(which);
546 return (cp_name == k->name());
547 }
550 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
551 ResourceMark rm;
552 int count = 0;
553 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
554 if (tag_at(index).is_unresolved_string()) {
555 // Intern string
556 symbolOop sym = unresolved_string_at(index);
557 oop entry = StringTable::intern(sym, CHECK_(-1));
558 string_at_put(index, entry);
559 }
560 }
561 return count;
562 }
565 // Iterate over symbols which are used as class, field, method names and
566 // signatures (in preparation for writing to the shared archive).
568 void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
569 for (int index = 1; index < length(); index++) { // Index 0 is unused
570 switch (tag_at(index).value()) {
572 case JVM_CONSTANT_UnresolvedClass:
573 closure->do_oop(obj_at_addr(index));
574 break;
576 case JVM_CONSTANT_NameAndType:
577 {
578 int i = *int_at_addr(index);
579 closure->do_oop(obj_at_addr((unsigned)i >> 16));
580 closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
581 }
582 break;
584 case JVM_CONSTANT_Class:
585 case JVM_CONSTANT_InterfaceMethodref:
586 case JVM_CONSTANT_Fieldref:
587 case JVM_CONSTANT_Methodref:
588 case JVM_CONSTANT_Integer:
589 case JVM_CONSTANT_Float:
590 // Do nothing! Not an oop.
591 // These constant types do not reference symbols at this point.
592 break;
594 case JVM_CONSTANT_String:
595 // Do nothing! Not a symbol.
596 break;
598 case JVM_CONSTANT_UnresolvedString:
599 case JVM_CONSTANT_Utf8:
600 // These constants are symbols, but unless these symbols are
601 // actually to be used for something, we don't want to mark them.
602 break;
604 case JVM_CONSTANT_Long:
605 case JVM_CONSTANT_Double:
606 // Do nothing! Not an oop. (But takes two pool entries.)
607 ++index;
608 break;
610 default:
611 ShouldNotReachHere();
612 break;
613 }
614 }
615 }
618 // Iterate over the [one] tags array (in preparation for writing to the
619 // shared archive).
621 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
622 closure->do_oop(tags_addr());
623 }
626 // Iterate over String objects (in preparation for writing to the shared
627 // archive).
629 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
630 for (int index = 1; index < length(); index++) { // Index 0 is unused
631 switch (tag_at(index).value()) {
633 case JVM_CONSTANT_UnresolvedClass:
634 case JVM_CONSTANT_NameAndType:
635 // Do nothing! Not a String.
636 break;
638 case JVM_CONSTANT_Class:
639 case JVM_CONSTANT_InterfaceMethodref:
640 case JVM_CONSTANT_Fieldref:
641 case JVM_CONSTANT_Methodref:
642 case JVM_CONSTANT_Integer:
643 case JVM_CONSTANT_Float:
644 // Do nothing! Not an oop.
645 // These constant types do not reference symbols at this point.
646 break;
648 case JVM_CONSTANT_String:
649 closure->do_oop(obj_at_addr(index));
650 break;
652 case JVM_CONSTANT_UnresolvedString:
653 case JVM_CONSTANT_Utf8:
654 // These constants are symbols, but unless these symbols are
655 // actually to be used for something, we don't want to mark them.
656 break;
658 case JVM_CONSTANT_Long:
659 case JVM_CONSTANT_Double:
660 // Do nothing! Not an oop. (But takes two pool entries.)
661 ++index;
662 break;
664 default:
665 ShouldNotReachHere();
666 break;
667 }
668 }
669 }
672 // Compare this constant pool's entry at index1 to the constant pool
673 // cp2's entry at index2.
674 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
675 int index2, TRAPS) {
677 jbyte t1 = tag_at(index1).value();
678 jbyte t2 = cp2->tag_at(index2).value();
681 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
682 // when comparing
683 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
684 t1 = JVM_CONSTANT_UnresolvedClass;
685 }
686 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
687 t2 = JVM_CONSTANT_UnresolvedClass;
688 }
690 if (t1 != t2) {
691 // Not the same entry type so there is nothing else to check. Note
692 // that this style of checking will consider resolved/unresolved
693 // class pairs and resolved/unresolved string pairs as different.
694 // From the constantPoolOop API point of view, this is correct
695 // behavior. See constantPoolKlass::merge() to see how this plays
696 // out in the context of constantPoolOop merging.
697 return false;
698 }
700 switch (t1) {
701 case JVM_CONSTANT_Class:
702 {
703 klassOop k1 = klass_at(index1, CHECK_false);
704 klassOop k2 = cp2->klass_at(index2, CHECK_false);
705 if (k1 == k2) {
706 return true;
707 }
708 } break;
710 case JVM_CONSTANT_ClassIndex:
711 {
712 int recur1 = klass_index_at(index1);
713 int recur2 = cp2->klass_index_at(index2);
714 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
715 if (match) {
716 return true;
717 }
718 } break;
720 case JVM_CONSTANT_Double:
721 {
722 jdouble d1 = double_at(index1);
723 jdouble d2 = cp2->double_at(index2);
724 if (d1 == d2) {
725 return true;
726 }
727 } break;
729 case JVM_CONSTANT_Fieldref:
730 case JVM_CONSTANT_InterfaceMethodref:
731 case JVM_CONSTANT_Methodref:
732 {
733 int recur1 = uncached_klass_ref_index_at(index1);
734 int recur2 = cp2->uncached_klass_ref_index_at(index2);
735 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
736 if (match) {
737 recur1 = uncached_name_and_type_ref_index_at(index1);
738 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
739 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
740 if (match) {
741 return true;
742 }
743 }
744 } break;
746 case JVM_CONSTANT_Float:
747 {
748 jfloat f1 = float_at(index1);
749 jfloat f2 = cp2->float_at(index2);
750 if (f1 == f2) {
751 return true;
752 }
753 } break;
755 case JVM_CONSTANT_Integer:
756 {
757 jint i1 = int_at(index1);
758 jint i2 = cp2->int_at(index2);
759 if (i1 == i2) {
760 return true;
761 }
762 } break;
764 case JVM_CONSTANT_Long:
765 {
766 jlong l1 = long_at(index1);
767 jlong l2 = cp2->long_at(index2);
768 if (l1 == l2) {
769 return true;
770 }
771 } break;
773 case JVM_CONSTANT_NameAndType:
774 {
775 int recur1 = name_ref_index_at(index1);
776 int recur2 = cp2->name_ref_index_at(index2);
777 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
778 if (match) {
779 recur1 = signature_ref_index_at(index1);
780 recur2 = cp2->signature_ref_index_at(index2);
781 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
782 if (match) {
783 return true;
784 }
785 }
786 } break;
788 case JVM_CONSTANT_String:
789 {
790 oop s1 = string_at(index1, CHECK_false);
791 oop s2 = cp2->string_at(index2, CHECK_false);
792 if (s1 == s2) {
793 return true;
794 }
795 } break;
797 case JVM_CONSTANT_StringIndex:
798 {
799 int recur1 = string_index_at(index1);
800 int recur2 = cp2->string_index_at(index2);
801 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
802 if (match) {
803 return true;
804 }
805 } break;
807 case JVM_CONSTANT_UnresolvedClass:
808 {
809 symbolOop k1 = unresolved_klass_at(index1);
810 symbolOop k2 = cp2->unresolved_klass_at(index2);
811 if (k1 == k2) {
812 return true;
813 }
814 } break;
816 case JVM_CONSTANT_MethodType:
817 {
818 int k1 = method_type_index_at(index1);
819 int k2 = cp2->method_type_index_at(index2);
820 if (k1 == k2) {
821 return true;
822 }
823 } break;
825 case JVM_CONSTANT_MethodHandle:
826 {
827 int k1 = method_handle_ref_kind_at(index1);
828 int k2 = cp2->method_handle_ref_kind_at(index2);
829 if (k1 == k2) {
830 int i1 = method_handle_index_at(index1);
831 int i2 = cp2->method_handle_index_at(index2);
832 if (i1 == i2) {
833 return true;
834 }
835 }
836 } break;
838 case JVM_CONSTANT_InvokeDynamic:
839 {
840 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
841 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
842 if (k1 == k2) {
843 int i1 = invoke_dynamic_name_and_type_ref_index_at(index1);
844 int i2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
845 if (i1 == i2) {
846 return true;
847 }
848 }
849 } break;
851 case JVM_CONSTANT_UnresolvedString:
852 {
853 symbolOop s1 = unresolved_string_at(index1);
854 symbolOop s2 = cp2->unresolved_string_at(index2);
855 if (s1 == s2) {
856 return true;
857 }
858 } break;
860 case JVM_CONSTANT_Utf8:
861 {
862 symbolOop s1 = symbol_at(index1);
863 symbolOop s2 = cp2->symbol_at(index2);
864 if (s1 == s2) {
865 return true;
866 }
867 } break;
869 // Invalid is used as the tag for the second constant pool entry
870 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
871 // not be seen by itself.
872 case JVM_CONSTANT_Invalid: // fall through
874 default:
875 ShouldNotReachHere();
876 break;
877 }
879 return false;
880 } // end compare_entry_to()
883 // Copy this constant pool's entries at start_i to end_i (inclusive)
884 // to the constant pool to_cp's entries starting at to_i. A total of
885 // (end_i - start_i) + 1 entries are copied.
886 void constantPoolOopDesc::copy_cp_to(int start_i, int end_i,
887 constantPoolHandle to_cp, int to_i, TRAPS) {
889 int dest_i = to_i; // leave original alone for debug purposes
891 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
892 copy_entry_to(src_i, to_cp, dest_i, CHECK);
894 switch (tag_at(src_i).value()) {
895 case JVM_CONSTANT_Double:
896 case JVM_CONSTANT_Long:
897 // double and long take two constant pool entries
898 src_i += 2;
899 dest_i += 2;
900 break;
902 default:
903 // all others take one constant pool entry
904 src_i++;
905 dest_i++;
906 break;
907 }
908 }
909 } // end copy_cp_to()
912 // Copy this constant pool's entry at from_i to the constant pool
913 // to_cp's entry at to_i.
914 void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp,
915 int to_i, TRAPS) {
917 switch (tag_at(from_i).value()) {
918 case JVM_CONSTANT_Class:
919 {
920 klassOop k = klass_at(from_i, CHECK);
921 to_cp->klass_at_put(to_i, k);
922 } break;
924 case JVM_CONSTANT_ClassIndex:
925 {
926 jint ki = klass_index_at(from_i);
927 to_cp->klass_index_at_put(to_i, ki);
928 } break;
930 case JVM_CONSTANT_Double:
931 {
932 jdouble d = double_at(from_i);
933 to_cp->double_at_put(to_i, d);
934 // double takes two constant pool entries so init second entry's tag
935 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
936 } break;
938 case JVM_CONSTANT_Fieldref:
939 {
940 int class_index = uncached_klass_ref_index_at(from_i);
941 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
942 to_cp->field_at_put(to_i, class_index, name_and_type_index);
943 } break;
945 case JVM_CONSTANT_Float:
946 {
947 jfloat f = float_at(from_i);
948 to_cp->float_at_put(to_i, f);
949 } break;
951 case JVM_CONSTANT_Integer:
952 {
953 jint i = int_at(from_i);
954 to_cp->int_at_put(to_i, i);
955 } break;
957 case JVM_CONSTANT_InterfaceMethodref:
958 {
959 int class_index = uncached_klass_ref_index_at(from_i);
960 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
961 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
962 } break;
964 case JVM_CONSTANT_Long:
965 {
966 jlong l = long_at(from_i);
967 to_cp->long_at_put(to_i, l);
968 // long takes two constant pool entries so init second entry's tag
969 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
970 } break;
972 case JVM_CONSTANT_Methodref:
973 {
974 int class_index = uncached_klass_ref_index_at(from_i);
975 int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
976 to_cp->method_at_put(to_i, class_index, name_and_type_index);
977 } break;
979 case JVM_CONSTANT_NameAndType:
980 {
981 int name_ref_index = name_ref_index_at(from_i);
982 int signature_ref_index = signature_ref_index_at(from_i);
983 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
984 } break;
986 case JVM_CONSTANT_String:
987 {
988 oop s = string_at(from_i, CHECK);
989 to_cp->string_at_put(to_i, s);
990 } break;
992 case JVM_CONSTANT_StringIndex:
993 {
994 jint si = string_index_at(from_i);
995 to_cp->string_index_at_put(to_i, si);
996 } break;
998 case JVM_CONSTANT_UnresolvedClass:
999 {
1000 symbolOop k = unresolved_klass_at(from_i);
1001 to_cp->unresolved_klass_at_put(to_i, k);
1002 } break;
1004 case JVM_CONSTANT_UnresolvedClassInError:
1005 {
1006 symbolOop k = unresolved_klass_at(from_i);
1007 to_cp->unresolved_klass_at_put(to_i, k);
1008 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1009 } break;
1012 case JVM_CONSTANT_UnresolvedString:
1013 {
1014 symbolOop s = unresolved_string_at(from_i);
1015 to_cp->unresolved_string_at_put(to_i, s);
1016 } break;
1018 case JVM_CONSTANT_Utf8:
1019 {
1020 symbolOop s = symbol_at(from_i);
1021 to_cp->symbol_at_put(to_i, s);
1022 } break;
1024 case JVM_CONSTANT_MethodType:
1025 {
1026 jint k = method_type_index_at(from_i);
1027 to_cp->method_type_index_at_put(to_i, k);
1028 } break;
1030 case JVM_CONSTANT_MethodHandle:
1031 {
1032 int k1 = method_handle_ref_kind_at(from_i);
1033 int k2 = method_handle_index_at(from_i);
1034 to_cp->method_handle_index_at_put(to_i, k1, k2);
1035 } break;
1037 case JVM_CONSTANT_InvokeDynamic:
1038 {
1039 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(from_i);
1040 int k2 = invoke_dynamic_name_and_type_ref_index_at(from_i);
1041 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1042 } break;
1044 // Invalid is used as the tag for the second constant pool entry
1045 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1046 // not be seen by itself.
1047 case JVM_CONSTANT_Invalid: // fall through
1049 default:
1050 {
1051 jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb
1052 ShouldNotReachHere();
1053 } break;
1054 }
1055 } // end copy_entry_to()
1058 // Search constant pool search_cp for an entry that matches this
1059 // constant pool's entry at pattern_i. Returns the index of a
1060 // matching entry or zero (0) if there is no matching entry.
1061 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1062 constantPoolHandle search_cp, TRAPS) {
1064 // index zero (0) is not used
1065 for (int i = 1; i < search_cp->length(); i++) {
1066 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1067 if (found) {
1068 return i;
1069 }
1070 }
1072 return 0; // entry not found; return unused index zero (0)
1073 } // end find_matching_entry()
1076 #ifndef PRODUCT
1078 const char* constantPoolOopDesc::printable_name_at(int which) {
1080 constantTag tag = tag_at(which);
1082 if (tag.is_unresolved_string() || tag.is_string()) {
1083 return string_at_noresolve(which);
1084 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1085 return klass_name_at(which)->as_C_string();
1086 } else if (tag.is_symbol()) {
1087 return symbol_at(which)->as_C_string();
1088 }
1089 return "";
1090 }
1092 #endif // PRODUCT
1095 // JVMTI GetConstantPool support
1097 // For temporary use until code is stable.
1098 #define DBG(code)
1100 static const char* WARN_MSG = "Must not be such entry!";
1102 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1103 jint size = 0;
1104 u2 idx1, idx2;
1106 for (jint idx = 1; idx < cnt; idx++) {
1107 jint ent_size = 0;
1108 u1 tag = *bytes++;
1109 size++; // count tag
1111 printf("const #%03d, tag: %02d ", idx, tag);
1112 switch(tag) {
1113 case JVM_CONSTANT_Invalid: {
1114 printf("Invalid");
1115 break;
1116 }
1117 case JVM_CONSTANT_Unicode: {
1118 printf("Unicode %s", WARN_MSG);
1119 break;
1120 }
1121 case JVM_CONSTANT_Utf8: {
1122 u2 len = Bytes::get_Java_u2(bytes);
1123 char str[128];
1124 if (len > 127) {
1125 len = 127;
1126 }
1127 strncpy(str, (char *) (bytes+2), len);
1128 str[len] = '\0';
1129 printf("Utf8 \"%s\"", str);
1130 ent_size = 2 + len;
1131 break;
1132 }
1133 case JVM_CONSTANT_Integer: {
1134 u4 val = Bytes::get_Java_u4(bytes);
1135 printf("int %d", *(int *) &val);
1136 ent_size = 4;
1137 break;
1138 }
1139 case JVM_CONSTANT_Float: {
1140 u4 val = Bytes::get_Java_u4(bytes);
1141 printf("float %5.3ff", *(float *) &val);
1142 ent_size = 4;
1143 break;
1144 }
1145 case JVM_CONSTANT_Long: {
1146 u8 val = Bytes::get_Java_u8(bytes);
1147 printf("long "INT64_FORMAT, *(jlong *) &val);
1148 ent_size = 8;
1149 idx++; // Long takes two cpool slots
1150 break;
1151 }
1152 case JVM_CONSTANT_Double: {
1153 u8 val = Bytes::get_Java_u8(bytes);
1154 printf("double %5.3fd", *(jdouble *)&val);
1155 ent_size = 8;
1156 idx++; // Double takes two cpool slots
1157 break;
1158 }
1159 case JVM_CONSTANT_Class: {
1160 idx1 = Bytes::get_Java_u2(bytes);
1161 printf("class #%03d", idx1);
1162 ent_size = 2;
1163 break;
1164 }
1165 case JVM_CONSTANT_String: {
1166 idx1 = Bytes::get_Java_u2(bytes);
1167 printf("String #%03d", idx1);
1168 ent_size = 2;
1169 break;
1170 }
1171 case JVM_CONSTANT_Fieldref: {
1172 idx1 = Bytes::get_Java_u2(bytes);
1173 idx2 = Bytes::get_Java_u2(bytes+2);
1174 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1175 ent_size = 4;
1176 break;
1177 }
1178 case JVM_CONSTANT_Methodref: {
1179 idx1 = Bytes::get_Java_u2(bytes);
1180 idx2 = Bytes::get_Java_u2(bytes+2);
1181 printf("Method #%03d, #%03d", idx1, idx2);
1182 ent_size = 4;
1183 break;
1184 }
1185 case JVM_CONSTANT_InterfaceMethodref: {
1186 idx1 = Bytes::get_Java_u2(bytes);
1187 idx2 = Bytes::get_Java_u2(bytes+2);
1188 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1189 ent_size = 4;
1190 break;
1191 }
1192 case JVM_CONSTANT_NameAndType: {
1193 idx1 = Bytes::get_Java_u2(bytes);
1194 idx2 = Bytes::get_Java_u2(bytes+2);
1195 printf("NameAndType #%03d, #%03d", idx1, idx2);
1196 ent_size = 4;
1197 break;
1198 }
1199 case JVM_CONSTANT_ClassIndex: {
1200 printf("ClassIndex %s", WARN_MSG);
1201 break;
1202 }
1203 case JVM_CONSTANT_UnresolvedClass: {
1204 printf("UnresolvedClass: %s", WARN_MSG);
1205 break;
1206 }
1207 case JVM_CONSTANT_UnresolvedClassInError: {
1208 printf("UnresolvedClassInErr: %s", WARN_MSG);
1209 break;
1210 }
1211 case JVM_CONSTANT_StringIndex: {
1212 printf("StringIndex: %s", WARN_MSG);
1213 break;
1214 }
1215 case JVM_CONSTANT_UnresolvedString: {
1216 printf("UnresolvedString: %s", WARN_MSG);
1217 break;
1218 }
1219 }
1220 printf(";\n");
1221 bytes += ent_size;
1222 size += ent_size;
1223 }
1224 printf("Cpool size: %d\n", size);
1225 fflush(0);
1226 return;
1227 } /* end print_cpool_bytes */
1230 // Returns size of constant pool entry.
1231 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1232 switch(tag_at(idx).value()) {
1233 case JVM_CONSTANT_Invalid:
1234 case JVM_CONSTANT_Unicode:
1235 return 1;
1237 case JVM_CONSTANT_Utf8:
1238 return 3 + symbol_at(idx)->utf8_length();
1240 case JVM_CONSTANT_Class:
1241 case JVM_CONSTANT_String:
1242 case JVM_CONSTANT_ClassIndex:
1243 case JVM_CONSTANT_UnresolvedClass:
1244 case JVM_CONSTANT_UnresolvedClassInError:
1245 case JVM_CONSTANT_StringIndex:
1246 case JVM_CONSTANT_UnresolvedString:
1247 case JVM_CONSTANT_MethodType:
1248 return 3;
1250 case JVM_CONSTANT_MethodHandle:
1251 return 4; //tag, ref_kind, ref_index
1253 case JVM_CONSTANT_Integer:
1254 case JVM_CONSTANT_Float:
1255 case JVM_CONSTANT_Fieldref:
1256 case JVM_CONSTANT_Methodref:
1257 case JVM_CONSTANT_InterfaceMethodref:
1258 case JVM_CONSTANT_NameAndType:
1259 case JVM_CONSTANT_InvokeDynamic:
1260 return 5;
1262 case JVM_CONSTANT_Long:
1263 case JVM_CONSTANT_Double:
1264 return 9;
1265 }
1266 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1267 return 1;
1268 } /* end cpool_entry_size */
1271 // SymbolHashMap is used to find a constant pool index from a string.
1272 // This function fills in SymbolHashMaps, one for utf8s and one for
1273 // class names, returns size of the cpool raw bytes.
1274 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1275 SymbolHashMap *classmap) {
1276 jint size = 0;
1278 for (u2 idx = 1; idx < length(); idx++) {
1279 u2 tag = tag_at(idx).value();
1280 size += cpool_entry_size(idx);
1282 switch(tag) {
1283 case JVM_CONSTANT_Utf8: {
1284 symbolOop sym = symbol_at(idx);
1285 symmap->add_entry(sym, idx);
1286 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1287 break;
1288 }
1289 case JVM_CONSTANT_Class:
1290 case JVM_CONSTANT_UnresolvedClass:
1291 case JVM_CONSTANT_UnresolvedClassInError: {
1292 symbolOop sym = klass_name_at(idx);
1293 classmap->add_entry(sym, idx);
1294 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1295 break;
1296 }
1297 case JVM_CONSTANT_Long:
1298 case JVM_CONSTANT_Double: {
1299 idx++; // Both Long and Double take two cpool slots
1300 break;
1301 }
1302 }
1303 }
1304 return size;
1305 } /* end hash_utf8_entries_to */
1308 // Copy cpool bytes.
1309 // Returns:
1310 // 0, in case of OutOfMemoryError
1311 // -1, in case of internal error
1312 // > 0, count of the raw cpool bytes that have been copied
1313 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1314 SymbolHashMap* tbl,
1315 unsigned char *bytes) {
1316 u2 idx1, idx2;
1317 jint size = 0;
1318 jint cnt = length();
1319 unsigned char *start_bytes = bytes;
1321 for (jint idx = 1; idx < cnt; idx++) {
1322 u1 tag = tag_at(idx).value();
1323 jint ent_size = cpool_entry_size(idx);
1325 assert(size + ent_size <= cpool_size, "Size mismatch");
1327 *bytes = tag;
1328 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1329 switch(tag) {
1330 case JVM_CONSTANT_Invalid: {
1331 DBG(printf("JVM_CONSTANT_Invalid"));
1332 break;
1333 }
1334 case JVM_CONSTANT_Unicode: {
1335 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1336 DBG(printf("JVM_CONSTANT_Unicode"));
1337 break;
1338 }
1339 case JVM_CONSTANT_Utf8: {
1340 symbolOop sym = symbol_at(idx);
1341 char* str = sym->as_utf8();
1342 // Warning! It's crashing on x86 with len = sym->utf8_length()
1343 int len = (int) strlen(str);
1344 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1345 for (int i = 0; i < len; i++) {
1346 bytes[3+i] = (u1) str[i];
1347 }
1348 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1349 break;
1350 }
1351 case JVM_CONSTANT_Integer: {
1352 jint val = int_at(idx);
1353 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1354 break;
1355 }
1356 case JVM_CONSTANT_Float: {
1357 jfloat val = float_at(idx);
1358 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1359 break;
1360 }
1361 case JVM_CONSTANT_Long: {
1362 jlong val = long_at(idx);
1363 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1364 idx++; // Long takes two cpool slots
1365 break;
1366 }
1367 case JVM_CONSTANT_Double: {
1368 jdouble val = double_at(idx);
1369 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1370 idx++; // Double takes two cpool slots
1371 break;
1372 }
1373 case JVM_CONSTANT_Class:
1374 case JVM_CONSTANT_UnresolvedClass:
1375 case JVM_CONSTANT_UnresolvedClassInError: {
1376 *bytes = JVM_CONSTANT_Class;
1377 symbolOop sym = klass_name_at(idx);
1378 idx1 = tbl->symbol_to_value(sym);
1379 assert(idx1 != 0, "Have not found a hashtable entry");
1380 Bytes::put_Java_u2((address) (bytes+1), idx1);
1381 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1382 break;
1383 }
1384 case JVM_CONSTANT_String: {
1385 unsigned int hash;
1386 char *str = string_at_noresolve(idx);
1387 symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1388 if (sym == NULL) {
1389 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1390 // this can happen with JVM TI; see CR 6839599 for more details
1391 oop string = *(obj_at_addr(idx));
1392 assert(java_lang_String::is_instance(string),"Not a String");
1393 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1394 idx1 = 0;
1395 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1396 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1397 int length;
1398 sym = cur->symbol();
1399 jchar* chars = sym->as_unicode(length);
1400 if (java_lang_String::equals(string, chars, length)) {
1401 idx1 = cur->value();
1402 DBG(printf("Index found: %d\n",idx1));
1403 break;
1404 }
1405 }
1406 }
1407 } else {
1408 idx1 = tbl->symbol_to_value(sym);
1409 }
1410 assert(idx1 != 0, "Have not found a hashtable entry");
1411 Bytes::put_Java_u2((address) (bytes+1), idx1);
1412 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1413 break;
1414 }
1415 case JVM_CONSTANT_UnresolvedString: {
1416 *bytes = JVM_CONSTANT_String;
1417 symbolOop sym = unresolved_string_at(idx);
1418 idx1 = tbl->symbol_to_value(sym);
1419 assert(idx1 != 0, "Have not found a hashtable entry");
1420 Bytes::put_Java_u2((address) (bytes+1), idx1);
1421 DBG(char *str = sym->as_utf8());
1422 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1423 break;
1424 }
1425 case JVM_CONSTANT_Fieldref:
1426 case JVM_CONSTANT_Methodref:
1427 case JVM_CONSTANT_InterfaceMethodref: {
1428 idx1 = uncached_klass_ref_index_at(idx);
1429 idx2 = uncached_name_and_type_ref_index_at(idx);
1430 Bytes::put_Java_u2((address) (bytes+1), idx1);
1431 Bytes::put_Java_u2((address) (bytes+3), idx2);
1432 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1433 break;
1434 }
1435 case JVM_CONSTANT_NameAndType: {
1436 idx1 = name_ref_index_at(idx);
1437 idx2 = signature_ref_index_at(idx);
1438 Bytes::put_Java_u2((address) (bytes+1), idx1);
1439 Bytes::put_Java_u2((address) (bytes+3), idx2);
1440 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1441 break;
1442 }
1443 case JVM_CONSTANT_ClassIndex: {
1444 *bytes = JVM_CONSTANT_Class;
1445 idx1 = klass_index_at(idx);
1446 Bytes::put_Java_u2((address) (bytes+1), idx1);
1447 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1448 break;
1449 }
1450 case JVM_CONSTANT_StringIndex: {
1451 *bytes = JVM_CONSTANT_String;
1452 idx1 = string_index_at(idx);
1453 Bytes::put_Java_u2((address) (bytes+1), idx1);
1454 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1455 break;
1456 }
1457 case JVM_CONSTANT_MethodHandle: {
1458 *bytes = JVM_CONSTANT_MethodHandle;
1459 int kind = method_handle_ref_kind_at(idx);
1460 idx1 = method_handle_index_at(idx);
1461 *(bytes+1) = (unsigned char) kind;
1462 Bytes::put_Java_u2((address) (bytes+2), idx1);
1463 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1464 break;
1465 }
1466 case JVM_CONSTANT_MethodType: {
1467 *bytes = JVM_CONSTANT_MethodType;
1468 idx1 = method_type_index_at(idx);
1469 Bytes::put_Java_u2((address) (bytes+1), idx1);
1470 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1471 break;
1472 }
1473 case JVM_CONSTANT_InvokeDynamic: {
1474 *bytes = JVM_CONSTANT_InvokeDynamic;
1475 idx1 = invoke_dynamic_bootstrap_method_ref_index_at(idx);
1476 idx2 = invoke_dynamic_name_and_type_ref_index_at(idx);
1477 Bytes::put_Java_u2((address) (bytes+1), idx1);
1478 Bytes::put_Java_u2((address) (bytes+3), idx2);
1479 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1480 break;
1481 }
1482 }
1483 DBG(printf("\n"));
1484 bytes += ent_size;
1485 size += ent_size;
1486 }
1487 assert(size == cpool_size, "Size mismatch");
1489 // Keep temorarily for debugging until it's stable.
1490 DBG(print_cpool_bytes(cnt, start_bytes));
1491 return (int)(bytes - start_bytes);
1492 } /* end copy_cpool_bytes */
1495 void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
1496 char *str = sym->as_utf8();
1497 unsigned int hash = compute_hash(str, sym->utf8_length());
1498 unsigned int index = hash % table_size();
1500 // check if already in map
1501 // we prefer the first entry since it is more likely to be what was used in
1502 // the class file
1503 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1504 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1505 if (en->hash() == hash && en->symbol() == sym) {
1506 return; // already there
1507 }
1508 }
1510 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1511 entry->set_next(bucket(index));
1512 _buckets[index].set_entry(entry);
1513 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1514 }
1516 SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
1517 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1518 char *str = sym->as_utf8();
1519 int len = sym->utf8_length();
1520 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1521 unsigned int index = hash % table_size();
1522 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1523 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1524 if (en->hash() == hash && en->symbol() == sym) {
1525 return en;
1526 }
1527 }
1528 return NULL;
1529 }