Tue, 15 Nov 2011 20:17:33 +0100
7110152: assert(size_in_words <= (julong)max_jint) failed: no overflow
Summary: Reduce what arrayOopDesc::max_array_length() returns to avoid int overflow
Reviewed-by: kvn, dholmes, tonyp
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * accompanied this code).
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/constantPoolOop.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/objArrayKlass.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "runtime/fieldType.hpp"
38 #include "runtime/init.hpp"
39 #include "runtime/signature.hpp"
40 #include "runtime/vframe.hpp"
42 void constantPoolOopDesc::set_flag_at(FlagBit fb) {
43 const int MAX_STATE_CHANGES = 2;
44 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
45 int oflags = _flags;
46 int nflags = oflags | (1 << (int)fb);
47 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
48 return;
49 }
50 assert(false, "failed to cmpxchg flags");
51 _flags |= (1 << (int)fb); // better than nothing
52 }
54 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
55 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
56 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
57 // tag is not updated atomicly.
58 CPSlot entry = this_oop->slot_at(which);
59 if (entry.is_oop()) {
60 assert(entry.get_oop()->is_klass(), "must be");
61 // Already resolved - return entry.
62 return (klassOop)entry.get_oop();
63 }
65 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
66 // already has updated the object
67 assert(THREAD->is_Java_thread(), "must be a Java thread");
68 bool do_resolve = false;
69 bool in_error = false;
71 Symbol* name = NULL;
72 Handle loader;
73 { ObjectLocker ol(this_oop, THREAD);
75 if (this_oop->tag_at(which).is_unresolved_klass()) {
76 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
77 in_error = true;
78 } else {
79 do_resolve = true;
80 name = this_oop->unresolved_klass_at(which);
81 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
82 }
83 }
84 } // unlocking constantPool
87 // The original attempt to resolve this constant pool entry failed so find the
88 // original error and throw it again (JVMS 5.4.3).
89 if (in_error) {
90 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
91 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
92 ResourceMark rm;
93 // exception text will be the class name
94 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
95 THROW_MSG_0(error, className);
96 }
98 if (do_resolve) {
99 // this_oop must be unlocked during resolve_or_fail
100 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
101 Handle h_prot (THREAD, protection_domain);
102 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
103 KlassHandle k;
104 if (!HAS_PENDING_EXCEPTION) {
105 k = KlassHandle(THREAD, k_oop);
106 // Do access check for klasses
107 verify_constant_pool_resolve(this_oop, k, THREAD);
108 }
110 // Failed to resolve class. We must record the errors so that subsequent attempts
111 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
112 if (HAS_PENDING_EXCEPTION) {
113 ResourceMark rm;
114 Symbol* error = PENDING_EXCEPTION->klass()->klass_part()->name();
116 bool throw_orig_error = false;
117 {
118 ObjectLocker ol (this_oop, THREAD);
120 // some other thread has beaten us and has resolved the class.
121 if (this_oop->tag_at(which).is_klass()) {
122 CLEAR_PENDING_EXCEPTION;
123 entry = this_oop->resolved_klass_at(which);
124 return (klassOop)entry.get_oop();
125 }
127 if (!PENDING_EXCEPTION->
128 is_a(SystemDictionary::LinkageError_klass())) {
129 // Just throw the exception and don't prevent these classes from
130 // being loaded due to virtual machine errors like StackOverflow
131 // and OutOfMemoryError, etc, or if the thread was hit by stop()
132 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
133 }
134 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
135 SystemDictionary::add_resolution_error(this_oop, which, error);
136 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
137 } else {
138 // some other thread has put the class in error state.
139 error = SystemDictionary::find_resolution_error(this_oop, which);
140 assert(error != NULL, "checking");
141 throw_orig_error = true;
142 }
143 } // unlocked
145 if (throw_orig_error) {
146 CLEAR_PENDING_EXCEPTION;
147 ResourceMark rm;
148 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
149 THROW_MSG_0(error, className);
150 }
152 return 0;
153 }
155 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
156 // skip resolving the constant pool so that this code get's
157 // called the next time some bytecodes refer to this class.
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = NULL;
161 if (JavaThread::current()->has_last_Java_frame()) {
162 // try to identify the method which called this function.
163 vframeStream vfst(JavaThread::current());
164 if (!vfst.at_end()) {
165 line_number = vfst.method()->line_number_from_bci(vfst.bci());
166 Symbol* s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
167 if (s != NULL) {
168 source_file = s->as_C_string();
169 }
170 }
171 }
172 if (k() != this_oop->pool_holder()) {
173 // only print something if the classes are different
174 if (source_file != NULL) {
175 tty->print("RESOLVE %s %s %s:%d\n",
176 instanceKlass::cast(this_oop->pool_holder())->external_name(),
177 instanceKlass::cast(k())->external_name(), source_file, line_number);
178 } else {
179 tty->print("RESOLVE %s %s\n",
180 instanceKlass::cast(this_oop->pool_holder())->external_name(),
181 instanceKlass::cast(k())->external_name());
182 }
183 }
184 return k();
185 } else {
186 ObjectLocker ol (this_oop, THREAD);
187 // Only updated constant pool - if it is resolved.
188 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
189 if (do_resolve) {
190 this_oop->klass_at_put(which, k());
191 }
192 }
193 }
195 entry = this_oop->resolved_klass_at(which);
196 assert(entry.is_oop() && entry.get_oop()->is_klass(), "must be resolved at this point");
197 return (klassOop)entry.get_oop();
198 }
201 // Does not update constantPoolOop - to avoid any exception throwing. Used
202 // by compiler and exception handling. Also used to avoid classloads for
203 // instanceof operations. Returns NULL if the class has not been loaded or
204 // if the verification of constant pool failed
205 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
206 CPSlot entry = this_oop->slot_at(which);
207 if (entry.is_oop()) {
208 assert(entry.get_oop()->is_klass(), "must be");
209 return (klassOop)entry.get_oop();
210 } else {
211 assert(entry.is_metadata(), "must be either symbol or klass");
212 Thread *thread = Thread::current();
213 Symbol* name = entry.get_symbol();
214 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
215 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
216 Handle h_prot (thread, protection_domain);
217 Handle h_loader (thread, loader);
218 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
220 if (k != NULL) {
221 // Make sure that resolving is legal
222 EXCEPTION_MARK;
223 KlassHandle klass(THREAD, k);
224 // return NULL if verification fails
225 verify_constant_pool_resolve(this_oop, klass, THREAD);
226 if (HAS_PENDING_EXCEPTION) {
227 CLEAR_PENDING_EXCEPTION;
228 return NULL;
229 }
230 return klass();
231 } else {
232 return k;
233 }
234 }
235 }
238 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
239 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
240 }
243 // This is an interface for the compiler that allows accessing non-resolved entries
244 // in the constant pool - but still performs the validations tests. Must be used
245 // in a pre-parse of the compiler - to determine what it can do and not do.
246 // Note: We cannot update the ConstantPool from the vm_thread.
247 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
248 int which = this_oop->klass_ref_index_at(index);
249 CPSlot entry = this_oop->slot_at(which);
250 if (entry.is_oop()) {
251 assert(entry.get_oop()->is_klass(), "must be");
252 return (klassOop)entry.get_oop();
253 } else {
254 assert(entry.is_metadata(), "must be either symbol or klass");
255 Symbol* name = entry.get_symbol();
256 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
257 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
258 Handle h_loader(THREAD, loader);
259 Handle h_prot (THREAD, protection_domain);
260 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
262 // Do access check for klasses
263 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
264 return k();
265 }
266 }
269 methodOop constantPoolOopDesc::method_at_if_loaded(constantPoolHandle cpool,
270 int which, Bytecodes::Code invoke_code) {
271 assert(!constantPoolCacheOopDesc::is_secondary_index(which), "no indy instruction here");
272 if (cpool->cache() == NULL) return false; // nothing to load yet
273 int cache_index = which - CPCACHE_INDEX_TAG;
274 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
275 if (PrintMiscellaneous && (Verbose||WizardMode)) {
276 tty->print_cr("bad operand %d for %d in:", which, invoke_code); cpool->print();
277 }
278 return NULL;
279 }
280 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
281 if (invoke_code != Bytecodes::_illegal)
282 return e->get_method_if_resolved(invoke_code, cpool);
283 Bytecodes::Code bc;
284 if ((bc = e->bytecode_1()) != (Bytecodes::Code)0)
285 return e->get_method_if_resolved(bc, cpool);
286 if ((bc = e->bytecode_2()) != (Bytecodes::Code)0)
287 return e->get_method_if_resolved(bc, cpool);
288 return NULL;
289 }
292 Symbol* constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
293 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
294 return symbol_at(name_index);
295 }
298 Symbol* constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
299 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
300 return symbol_at(signature_index);
301 }
304 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
305 int i = which;
306 if (!uncached && cache() != NULL) {
307 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
308 // Invokedynamic index.
309 int pool_index = cache()->main_entry_at(which)->constant_pool_index();
310 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
311 assert(tag_at(pool_index).is_name_and_type(), "");
312 return pool_index;
313 }
314 // change byte-ordering and go via cache
315 i = remap_instruction_operand_from_cache(which);
316 } else {
317 if (tag_at(which).is_invoke_dynamic()) {
318 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
319 assert(tag_at(pool_index).is_name_and_type(), "");
320 return pool_index;
321 }
322 }
323 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
324 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
325 jint ref_index = *int_at_addr(i);
326 return extract_high_short_from_int(ref_index);
327 }
330 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
331 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
332 "an invokedynamic instruction does not have a klass");
333 int i = which;
334 if (!uncached && cache() != NULL) {
335 // change byte-ordering and go via cache
336 i = remap_instruction_operand_from_cache(which);
337 }
338 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
339 jint ref_index = *int_at_addr(i);
340 return extract_low_short_from_int(ref_index);
341 }
345 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
346 int cpc_index = operand;
347 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
348 assert((int)(u2)cpc_index == cpc_index, "clean u2");
349 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
350 return member_index;
351 }
354 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
355 if (k->oop_is_instance() || k->oop_is_objArray()) {
356 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
357 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
358 KlassHandle element (THREAD, elem_oop);
360 // The element type could be a typeArray - we only need the access check if it is
361 // an reference to another class
362 if (element->oop_is_instance()) {
363 LinkResolver::check_klass_accessability(holder, element, CHECK);
364 }
365 }
366 }
369 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
370 jint ref_index = name_and_type_at(which_nt);
371 return extract_low_short_from_int(ref_index);
372 }
375 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
376 jint ref_index = name_and_type_at(which_nt);
377 return extract_high_short_from_int(ref_index);
378 }
381 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
382 return klass_at(klass_ref_index_at(which), CHECK_NULL);
383 }
386 Symbol* constantPoolOopDesc::klass_name_at(int which) {
387 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
388 "Corrupted constant pool");
389 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
390 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
391 // tag is not updated atomicly.
392 CPSlot entry = slot_at(which);
393 if (entry.is_oop()) {
394 // Already resolved - return entry's name.
395 assert(entry.get_oop()->is_klass(), "must be");
396 return klassOop(entry.get_oop())->klass_part()->name();
397 } else {
398 assert(entry.is_metadata(), "must be either symbol or klass");
399 return entry.get_symbol();
400 }
401 }
403 Symbol* constantPoolOopDesc::klass_ref_at_noresolve(int which) {
404 jint ref_index = klass_ref_index_at(which);
405 return klass_at_noresolve(ref_index);
406 }
408 Symbol* constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) {
409 jint ref_index = uncached_klass_ref_index_at(which);
410 return klass_at_noresolve(ref_index);
411 }
413 char* constantPoolOopDesc::string_at_noresolve(int which) {
414 // Test entry type in case string is resolved while in here.
415 CPSlot entry = slot_at(which);
416 if (entry.is_metadata()) {
417 return (entry.get_symbol())->as_C_string();
418 } else if (java_lang_String::is_instance(entry.get_oop())) {
419 return java_lang_String::as_utf8_string(entry.get_oop());
420 } else {
421 return (char*)"<pseudo-string>";
422 }
423 }
426 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
427 return FieldType::basic_type(symbol_at(which));
428 }
431 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
432 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
433 if (this_oop->tag_at(index).is_unresolved_string()) {
434 this_oop->string_at(index, CHECK);
435 }
436 }
437 }
439 // A resolved constant value in the CP cache is represented as a non-null
440 // value. As a special case, this value can be a 'systemObjArray'
441 // which masks an exception object to throw.
442 // This allows a MethodHandle constant reference to throw a consistent
443 // exception every time, if it fails to resolve.
444 static oop decode_exception_from_f1(oop result_oop, TRAPS) {
445 if (result_oop->klass() != Universe::systemObjArrayKlassObj())
446 return result_oop;
448 // Special cases here: Masked null, saved exception.
449 objArrayOop sys_array = (objArrayOop) result_oop;
450 assert(sys_array->length() == 1, "bad system array");
451 if (sys_array->length() == 1) {
452 THROW_OOP_(sys_array->obj_at(0), NULL);
453 }
454 return NULL;
455 }
457 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
458 oop result_oop = NULL;
459 Handle throw_exception;
461 if (cache_index == _possible_index_sentinel) {
462 // It is possible that this constant is one which is cached in the CP cache.
463 // We'll do a linear search. This should be OK because this usage is rare.
464 assert(index > 0, "valid index");
465 constantPoolCacheOop cache = this_oop()->cache();
466 for (int i = 0, len = cache->length(); i < len; i++) {
467 ConstantPoolCacheEntry* cpc_entry = cache->entry_at(i);
468 if (!cpc_entry->is_secondary_entry() && cpc_entry->constant_pool_index() == index) {
469 // Switch the query to use this CPC entry.
470 cache_index = i;
471 index = _no_index_sentinel;
472 break;
473 }
474 }
475 if (cache_index == _possible_index_sentinel)
476 cache_index = _no_index_sentinel; // not found
477 }
478 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
479 assert(index == _no_index_sentinel || index >= 0, "");
481 if (cache_index >= 0) {
482 assert(index == _no_index_sentinel, "only one kind of index at a time");
483 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
484 result_oop = cpc_entry->f1();
485 if (result_oop != NULL) {
486 return decode_exception_from_f1(result_oop, THREAD);
487 // That was easy...
488 }
489 index = cpc_entry->constant_pool_index();
490 }
492 jvalue prim_value; // temp used only in a few cases below
494 int tag_value = this_oop->tag_at(index).value();
495 switch (tag_value) {
497 case JVM_CONSTANT_UnresolvedClass:
498 case JVM_CONSTANT_UnresolvedClassInError:
499 case JVM_CONSTANT_Class:
500 {
501 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL);
502 // ldc wants the java mirror.
503 result_oop = resolved->java_mirror();
504 break;
505 }
507 case JVM_CONSTANT_String:
508 case JVM_CONSTANT_UnresolvedString:
509 if (this_oop->is_pseudo_string_at(index)) {
510 result_oop = this_oop->pseudo_string_at(index);
511 break;
512 }
513 result_oop = string_at_impl(this_oop, index, CHECK_NULL);
514 break;
516 case JVM_CONSTANT_Object:
517 result_oop = this_oop->object_at(index);
518 break;
520 case JVM_CONSTANT_MethodHandle:
521 {
522 int ref_kind = this_oop->method_handle_ref_kind_at(index);
523 int callee_index = this_oop->method_handle_klass_index_at(index);
524 Symbol* name = this_oop->method_handle_name_ref_at(index);
525 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
526 if (PrintMiscellaneous)
527 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
528 ref_kind, index, this_oop->method_handle_index_at(index),
529 callee_index, name->as_C_string(), signature->as_C_string());
530 KlassHandle callee;
531 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
532 callee = KlassHandle(THREAD, k);
533 }
534 KlassHandle klass(THREAD, this_oop->pool_holder());
535 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
536 callee, name, signature,
537 THREAD);
538 if (HAS_PENDING_EXCEPTION) {
539 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
540 CLEAR_PENDING_EXCEPTION;
541 break;
542 }
543 result_oop = value();
544 assert(result_oop != NULL, "");
545 break;
546 }
548 case JVM_CONSTANT_MethodType:
549 {
550 Symbol* signature = this_oop->method_type_signature_at(index);
551 if (PrintMiscellaneous)
552 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
553 index, this_oop->method_type_index_at(index),
554 signature->as_C_string());
555 KlassHandle klass(THREAD, this_oop->pool_holder());
556 bool ignore_is_on_bcp = false;
557 Handle value = SystemDictionary::find_method_handle_type(signature,
558 klass,
559 false,
560 ignore_is_on_bcp,
561 THREAD);
562 if (HAS_PENDING_EXCEPTION) {
563 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
564 CLEAR_PENDING_EXCEPTION;
565 break;
566 }
567 result_oop = value();
568 assert(result_oop != NULL, "");
569 break;
570 }
572 case JVM_CONSTANT_Integer:
573 prim_value.i = this_oop->int_at(index);
574 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
575 break;
577 case JVM_CONSTANT_Float:
578 prim_value.f = this_oop->float_at(index);
579 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
580 break;
582 case JVM_CONSTANT_Long:
583 prim_value.j = this_oop->long_at(index);
584 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
585 break;
587 case JVM_CONSTANT_Double:
588 prim_value.d = this_oop->double_at(index);
589 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
590 break;
592 default:
593 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
594 this_oop(), index, cache_index, tag_value) );
595 assert(false, "unexpected constant tag");
596 break;
597 }
599 if (cache_index >= 0) {
600 // Cache the oop here also.
601 if (throw_exception.not_null()) {
602 objArrayOop sys_array = oopFactory::new_system_objArray(1, CHECK_NULL);
603 sys_array->obj_at_put(0, throw_exception());
604 result_oop = sys_array;
605 throw_exception = Handle(); // be tidy
606 }
607 Handle result_handle(THREAD, result_oop);
608 result_oop = NULL; // safety
609 ObjectLocker ol(this_oop, THREAD);
610 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
611 result_oop = cpc_entry->f1();
612 // Benign race condition: f1 may already be filled in while we were trying to lock.
613 // The important thing here is that all threads pick up the same result.
614 // It doesn't matter which racing thread wins, as long as only one
615 // result is used by all threads, and all future queries.
616 // That result may be either a resolved constant or a failure exception.
617 if (result_oop == NULL) {
618 result_oop = result_handle();
619 cpc_entry->set_f1(result_oop);
620 }
621 return decode_exception_from_f1(result_oop, THREAD);
622 } else {
623 if (throw_exception.not_null()) {
624 THROW_HANDLE_(throw_exception, NULL);
625 }
626 return result_oop;
627 }
628 }
630 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
631 oop str = NULL;
632 CPSlot entry = this_oop->slot_at(which);
633 if (entry.is_metadata()) {
634 ObjectLocker ol(this_oop, THREAD);
635 if (this_oop->tag_at(which).is_unresolved_string()) {
636 // Intern string
637 Symbol* sym = this_oop->unresolved_string_at(which);
638 str = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
639 this_oop->string_at_put(which, str);
640 } else {
641 // Another thread beat us and interned string, read string from constant pool
642 str = this_oop->resolved_string_at(which);
643 }
644 } else {
645 str = entry.get_oop();
646 }
647 assert(java_lang_String::is_instance(str), "must be string");
648 return str;
649 }
652 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
653 CPSlot entry = slot_at(which);
654 if (entry.is_metadata())
655 // Not yet resolved, but it will resolve to a string.
656 return false;
657 else if (java_lang_String::is_instance(entry.get_oop()))
658 return false; // actually, it might be a non-interned or non-perm string
659 else
660 // truly pseudo
661 return true;
662 }
665 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
666 int which) {
667 // Names are interned, so we can compare Symbol*s directly
668 Symbol* cp_name = klass_name_at(which);
669 return (cp_name == k->name());
670 }
673 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
674 ResourceMark rm;
675 int count = 0;
676 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
677 if (tag_at(index).is_unresolved_string()) {
678 // Intern string
679 Symbol* sym = unresolved_string_at(index);
680 oop entry = StringTable::intern(sym, CHECK_(-1));
681 string_at_put(index, entry);
682 }
683 }
684 return count;
685 }
687 // Iterate over symbols and decrement ones which are Symbol*s.
688 // This is done during GC so do not need to lock constantPool unless we
689 // have per-thread safepoints.
690 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
691 // these symbols but didn't increment the reference count.
692 void constantPoolOopDesc::unreference_symbols() {
693 for (int index = 1; index < length(); index++) { // Index 0 is unused
694 constantTag tag = tag_at(index);
695 if (tag.is_symbol()) {
696 symbol_at(index)->decrement_refcount();
697 }
698 }
699 }
701 // Iterate over symbols which are used as class, field, method names and
702 // signatures (in preparation for writing to the shared archive).
704 void constantPoolOopDesc::shared_symbols_iterate(SymbolClosure* closure) {
705 for (int index = 1; index < length(); index++) { // Index 0 is unused
706 switch (tag_at(index).value()) {
708 case JVM_CONSTANT_UnresolvedClass:
709 case JVM_CONSTANT_UnresolvedString:
710 case JVM_CONSTANT_Utf8:
711 assert(slot_at(index).is_metadata(), "must be symbol");
712 closure->do_symbol(symbol_at_addr(index));
713 break;
715 case JVM_CONSTANT_NameAndType:
716 {
717 int i = *int_at_addr(index);
718 closure->do_symbol(symbol_at_addr((unsigned)i >> 16));
719 closure->do_symbol(symbol_at_addr((unsigned)i & 0xffff));
720 }
721 break;
723 case JVM_CONSTANT_Class:
724 case JVM_CONSTANT_InterfaceMethodref:
725 case JVM_CONSTANT_Fieldref:
726 case JVM_CONSTANT_Methodref:
727 case JVM_CONSTANT_Integer:
728 case JVM_CONSTANT_Float:
729 // Do nothing! Not an oop.
730 // These constant types do not reference symbols at this point.
731 break;
733 case JVM_CONSTANT_String:
734 // Do nothing! Not a symbol.
735 break;
737 case JVM_CONSTANT_Long:
738 case JVM_CONSTANT_Double:
739 // Do nothing! Not an oop. (But takes two pool entries.)
740 ++index;
741 break;
743 default:
744 ShouldNotReachHere();
745 break;
746 }
747 }
748 }
751 // Iterate over the [one] tags array (in preparation for writing to the
752 // shared archive).
754 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
755 closure->do_oop(tags_addr());
756 closure->do_oop(operands_addr());
757 }
760 // Iterate over String objects (in preparation for writing to the shared
761 // archive).
763 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
764 for (int index = 1; index < length(); index++) { // Index 0 is unused
765 switch (tag_at(index).value()) {
767 case JVM_CONSTANT_UnresolvedClass:
768 case JVM_CONSTANT_NameAndType:
769 // Do nothing! Not a String.
770 break;
772 case JVM_CONSTANT_Class:
773 case JVM_CONSTANT_InterfaceMethodref:
774 case JVM_CONSTANT_Fieldref:
775 case JVM_CONSTANT_Methodref:
776 case JVM_CONSTANT_Integer:
777 case JVM_CONSTANT_Float:
778 // Do nothing! Not an oop.
779 // These constant types do not reference symbols at this point.
780 break;
782 case JVM_CONSTANT_String:
783 closure->do_oop(obj_at_addr_raw(index));
784 break;
786 case JVM_CONSTANT_UnresolvedString:
787 case JVM_CONSTANT_Utf8:
788 // These constants are symbols, but unless these symbols are
789 // actually to be used for something, we don't want to mark them.
790 break;
792 case JVM_CONSTANT_Long:
793 case JVM_CONSTANT_Double:
794 // Do nothing! Not an oop. (But takes two pool entries.)
795 ++index;
796 break;
798 default:
799 ShouldNotReachHere();
800 break;
801 }
802 }
803 }
806 // Compare this constant pool's entry at index1 to the constant pool
807 // cp2's entry at index2.
808 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
809 int index2, TRAPS) {
811 jbyte t1 = tag_at(index1).value();
812 jbyte t2 = cp2->tag_at(index2).value();
815 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
816 // when comparing
817 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
818 t1 = JVM_CONSTANT_UnresolvedClass;
819 }
820 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
821 t2 = JVM_CONSTANT_UnresolvedClass;
822 }
824 if (t1 != t2) {
825 // Not the same entry type so there is nothing else to check. Note
826 // that this style of checking will consider resolved/unresolved
827 // class pairs and resolved/unresolved string pairs as different.
828 // From the constantPoolOop API point of view, this is correct
829 // behavior. See constantPoolKlass::merge() to see how this plays
830 // out in the context of constantPoolOop merging.
831 return false;
832 }
834 switch (t1) {
835 case JVM_CONSTANT_Class:
836 {
837 klassOop k1 = klass_at(index1, CHECK_false);
838 klassOop k2 = cp2->klass_at(index2, CHECK_false);
839 if (k1 == k2) {
840 return true;
841 }
842 } break;
844 case JVM_CONSTANT_ClassIndex:
845 {
846 int recur1 = klass_index_at(index1);
847 int recur2 = cp2->klass_index_at(index2);
848 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
849 if (match) {
850 return true;
851 }
852 } break;
854 case JVM_CONSTANT_Double:
855 {
856 jdouble d1 = double_at(index1);
857 jdouble d2 = cp2->double_at(index2);
858 if (d1 == d2) {
859 return true;
860 }
861 } break;
863 case JVM_CONSTANT_Fieldref:
864 case JVM_CONSTANT_InterfaceMethodref:
865 case JVM_CONSTANT_Methodref:
866 {
867 int recur1 = uncached_klass_ref_index_at(index1);
868 int recur2 = cp2->uncached_klass_ref_index_at(index2);
869 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
870 if (match) {
871 recur1 = uncached_name_and_type_ref_index_at(index1);
872 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
873 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
874 if (match) {
875 return true;
876 }
877 }
878 } break;
880 case JVM_CONSTANT_Float:
881 {
882 jfloat f1 = float_at(index1);
883 jfloat f2 = cp2->float_at(index2);
884 if (f1 == f2) {
885 return true;
886 }
887 } break;
889 case JVM_CONSTANT_Integer:
890 {
891 jint i1 = int_at(index1);
892 jint i2 = cp2->int_at(index2);
893 if (i1 == i2) {
894 return true;
895 }
896 } break;
898 case JVM_CONSTANT_Long:
899 {
900 jlong l1 = long_at(index1);
901 jlong l2 = cp2->long_at(index2);
902 if (l1 == l2) {
903 return true;
904 }
905 } break;
907 case JVM_CONSTANT_NameAndType:
908 {
909 int recur1 = name_ref_index_at(index1);
910 int recur2 = cp2->name_ref_index_at(index2);
911 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
912 if (match) {
913 recur1 = signature_ref_index_at(index1);
914 recur2 = cp2->signature_ref_index_at(index2);
915 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
916 if (match) {
917 return true;
918 }
919 }
920 } break;
922 case JVM_CONSTANT_String:
923 {
924 oop s1 = string_at(index1, CHECK_false);
925 oop s2 = cp2->string_at(index2, CHECK_false);
926 if (s1 == s2) {
927 return true;
928 }
929 } break;
931 case JVM_CONSTANT_StringIndex:
932 {
933 int recur1 = string_index_at(index1);
934 int recur2 = cp2->string_index_at(index2);
935 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
936 if (match) {
937 return true;
938 }
939 } break;
941 case JVM_CONSTANT_UnresolvedClass:
942 {
943 Symbol* k1 = unresolved_klass_at(index1);
944 Symbol* k2 = cp2->unresolved_klass_at(index2);
945 if (k1 == k2) {
946 return true;
947 }
948 } break;
950 case JVM_CONSTANT_MethodType:
951 {
952 int k1 = method_type_index_at(index1);
953 int k2 = cp2->method_type_index_at(index2);
954 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
955 if (match) {
956 return true;
957 }
958 } break;
960 case JVM_CONSTANT_MethodHandle:
961 {
962 int k1 = method_handle_ref_kind_at(index1);
963 int k2 = cp2->method_handle_ref_kind_at(index2);
964 if (k1 == k2) {
965 int i1 = method_handle_index_at(index1);
966 int i2 = cp2->method_handle_index_at(index2);
967 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
968 if (match) {
969 return true;
970 }
971 }
972 } break;
974 case JVM_CONSTANT_InvokeDynamic:
975 {
976 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
977 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
978 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
979 if (!match) return false;
980 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
981 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
982 match = compare_entry_to(k1, cp2, k2, CHECK_false);
983 if (!match) return false;
984 int argc = invoke_dynamic_argument_count_at(index1);
985 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
986 for (int j = 0; j < argc; j++) {
987 k1 = invoke_dynamic_argument_index_at(index1, j);
988 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
989 match = compare_entry_to(k1, cp2, k2, CHECK_false);
990 if (!match) return false;
991 }
992 return true; // got through loop; all elements equal
993 }
994 } break;
996 case JVM_CONSTANT_UnresolvedString:
997 {
998 Symbol* s1 = unresolved_string_at(index1);
999 Symbol* s2 = cp2->unresolved_string_at(index2);
1000 if (s1 == s2) {
1001 return true;
1002 }
1003 } break;
1005 case JVM_CONSTANT_Utf8:
1006 {
1007 Symbol* s1 = symbol_at(index1);
1008 Symbol* s2 = cp2->symbol_at(index2);
1009 if (s1 == s2) {
1010 return true;
1011 }
1012 } break;
1014 // Invalid is used as the tag for the second constant pool entry
1015 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1016 // not be seen by itself.
1017 case JVM_CONSTANT_Invalid: // fall through
1019 default:
1020 ShouldNotReachHere();
1021 break;
1022 }
1024 return false;
1025 } // end compare_entry_to()
1028 // Copy this constant pool's entries at start_i to end_i (inclusive)
1029 // to the constant pool to_cp's entries starting at to_i. A total of
1030 // (end_i - start_i) + 1 entries are copied.
1031 void constantPoolOopDesc::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1032 constantPoolHandle to_cp, int to_i, TRAPS) {
1034 int dest_i = to_i; // leave original alone for debug purposes
1036 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1037 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1039 switch (from_cp->tag_at(src_i).value()) {
1040 case JVM_CONSTANT_Double:
1041 case JVM_CONSTANT_Long:
1042 // double and long take two constant pool entries
1043 src_i += 2;
1044 dest_i += 2;
1045 break;
1047 default:
1048 // all others take one constant pool entry
1049 src_i++;
1050 dest_i++;
1051 break;
1052 }
1053 }
1055 int from_oplen = operand_array_length(from_cp->operands());
1056 int old_oplen = operand_array_length(to_cp->operands());
1057 if (from_oplen != 0) {
1058 // append my operands to the target's operands array
1059 if (old_oplen == 0) {
1060 to_cp->set_operands(from_cp->operands()); // reuse; do not merge
1061 } else {
1062 int old_len = to_cp->operands()->length();
1063 int from_len = from_cp->operands()->length();
1064 int old_off = old_oplen * sizeof(u2);
1065 int from_off = from_oplen * sizeof(u2);
1066 typeArrayHandle new_operands = oopFactory::new_permanent_shortArray(old_len + from_len, CHECK);
1067 int fillp = 0, len = 0;
1068 // first part of dest
1069 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1070 new_operands->short_at_addr(fillp),
1071 (len = old_off) * sizeof(u2));
1072 fillp += len;
1073 // first part of src
1074 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1075 new_operands->short_at_addr(fillp),
1076 (len = from_off) * sizeof(u2));
1077 fillp += len;
1078 // second part of dest
1079 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(old_off),
1080 new_operands->short_at_addr(fillp),
1081 (len = old_len - old_off) * sizeof(u2));
1082 fillp += len;
1083 // second part of src
1084 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(from_off),
1085 new_operands->short_at_addr(fillp),
1086 (len = from_len - from_off) * sizeof(u2));
1087 fillp += len;
1088 assert(fillp == new_operands->length(), "");
1090 // Adjust indexes in the first part of the copied operands array.
1091 for (int j = 0; j < from_oplen; j++) {
1092 int offset = operand_offset_at(new_operands(), old_oplen + j);
1093 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1094 offset += old_len; // every new tuple is preceded by old_len extra u2's
1095 operand_offset_at_put(new_operands(), old_oplen + j, offset);
1096 }
1098 // replace target operands array with combined array
1099 to_cp->set_operands(new_operands());
1100 }
1101 }
1103 } // end copy_cp_to()
1106 // Copy this constant pool's entry at from_i to the constant pool
1107 // to_cp's entry at to_i.
1108 void constantPoolOopDesc::copy_entry_to(constantPoolHandle from_cp, int from_i,
1109 constantPoolHandle to_cp, int to_i,
1110 TRAPS) {
1112 int tag = from_cp->tag_at(from_i).value();
1113 switch (tag) {
1114 case JVM_CONSTANT_Class:
1115 {
1116 klassOop k = from_cp->klass_at(from_i, CHECK);
1117 to_cp->klass_at_put(to_i, k);
1118 } break;
1120 case JVM_CONSTANT_ClassIndex:
1121 {
1122 jint ki = from_cp->klass_index_at(from_i);
1123 to_cp->klass_index_at_put(to_i, ki);
1124 } break;
1126 case JVM_CONSTANT_Double:
1127 {
1128 jdouble d = from_cp->double_at(from_i);
1129 to_cp->double_at_put(to_i, d);
1130 // double takes two constant pool entries so init second entry's tag
1131 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1132 } break;
1134 case JVM_CONSTANT_Fieldref:
1135 {
1136 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1137 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1138 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1139 } break;
1141 case JVM_CONSTANT_Float:
1142 {
1143 jfloat f = from_cp->float_at(from_i);
1144 to_cp->float_at_put(to_i, f);
1145 } break;
1147 case JVM_CONSTANT_Integer:
1148 {
1149 jint i = from_cp->int_at(from_i);
1150 to_cp->int_at_put(to_i, i);
1151 } break;
1153 case JVM_CONSTANT_InterfaceMethodref:
1154 {
1155 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1156 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1157 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1158 } break;
1160 case JVM_CONSTANT_Long:
1161 {
1162 jlong l = from_cp->long_at(from_i);
1163 to_cp->long_at_put(to_i, l);
1164 // long takes two constant pool entries so init second entry's tag
1165 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1166 } break;
1168 case JVM_CONSTANT_Methodref:
1169 {
1170 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1171 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1172 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1173 } break;
1175 case JVM_CONSTANT_NameAndType:
1176 {
1177 int name_ref_index = from_cp->name_ref_index_at(from_i);
1178 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1179 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1180 } break;
1182 case JVM_CONSTANT_String:
1183 {
1184 oop s = from_cp->string_at(from_i, CHECK);
1185 to_cp->string_at_put(to_i, s);
1186 } break;
1188 case JVM_CONSTANT_StringIndex:
1189 {
1190 jint si = from_cp->string_index_at(from_i);
1191 to_cp->string_index_at_put(to_i, si);
1192 } break;
1194 case JVM_CONSTANT_UnresolvedClass:
1195 {
1196 // Can be resolved after checking tag, so check the slot first.
1197 CPSlot entry = from_cp->slot_at(from_i);
1198 if (entry.is_oop()) {
1199 assert(entry.get_oop()->is_klass(), "must be");
1200 // Already resolved
1201 to_cp->klass_at_put(to_i, (klassOop)entry.get_oop());
1202 } else {
1203 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1204 }
1205 } break;
1207 case JVM_CONSTANT_UnresolvedClassInError:
1208 {
1209 Symbol* k = from_cp->unresolved_klass_at(from_i);
1210 to_cp->unresolved_klass_at_put(to_i, k);
1211 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1212 } break;
1215 case JVM_CONSTANT_UnresolvedString:
1216 {
1217 // Can be resolved after checking tag, so check the slot first.
1218 CPSlot entry = from_cp->slot_at(from_i);
1219 if (entry.is_oop()) {
1220 // Already resolved (either string or pseudo-string)
1221 to_cp->string_at_put(to_i, entry.get_oop());
1222 } else {
1223 to_cp->unresolved_string_at_put(to_i, entry.get_symbol());
1224 }
1225 } break;
1227 case JVM_CONSTANT_Utf8:
1228 {
1229 Symbol* s = from_cp->symbol_at(from_i);
1230 to_cp->symbol_at_put(to_i, s);
1231 // This constantPool has the same lifetime as the original, so don't
1232 // increase reference counts for the copy.
1233 } break;
1235 case JVM_CONSTANT_MethodType:
1236 {
1237 jint k = from_cp->method_type_index_at(from_i);
1238 to_cp->method_type_index_at_put(to_i, k);
1239 } break;
1241 case JVM_CONSTANT_MethodHandle:
1242 {
1243 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1244 int k2 = from_cp->method_handle_index_at(from_i);
1245 to_cp->method_handle_index_at_put(to_i, k1, k2);
1246 } break;
1248 case JVM_CONSTANT_InvokeDynamic:
1249 {
1250 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1251 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1252 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1253 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1254 } break;
1256 // Invalid is used as the tag for the second constant pool entry
1257 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1258 // not be seen by itself.
1259 case JVM_CONSTANT_Invalid: // fall through
1261 default:
1262 {
1263 ShouldNotReachHere();
1264 } break;
1265 }
1266 } // end copy_entry_to()
1269 // Search constant pool search_cp for an entry that matches this
1270 // constant pool's entry at pattern_i. Returns the index of a
1271 // matching entry or zero (0) if there is no matching entry.
1272 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1273 constantPoolHandle search_cp, TRAPS) {
1275 // index zero (0) is not used
1276 for (int i = 1; i < search_cp->length(); i++) {
1277 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1278 if (found) {
1279 return i;
1280 }
1281 }
1283 return 0; // entry not found; return unused index zero (0)
1284 } // end find_matching_entry()
1287 #ifndef PRODUCT
1289 const char* constantPoolOopDesc::printable_name_at(int which) {
1291 constantTag tag = tag_at(which);
1293 if (tag.is_unresolved_string() || tag.is_string()) {
1294 return string_at_noresolve(which);
1295 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1296 return klass_name_at(which)->as_C_string();
1297 } else if (tag.is_symbol()) {
1298 return symbol_at(which)->as_C_string();
1299 }
1300 return "";
1301 }
1303 #endif // PRODUCT
1306 // JVMTI GetConstantPool support
1308 // For temporary use until code is stable.
1309 #define DBG(code)
1311 static const char* WARN_MSG = "Must not be such entry!";
1313 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1314 jint size = 0;
1315 u2 idx1, idx2;
1317 for (jint idx = 1; idx < cnt; idx++) {
1318 jint ent_size = 0;
1319 u1 tag = *bytes++;
1320 size++; // count tag
1322 printf("const #%03d, tag: %02d ", idx, tag);
1323 switch(tag) {
1324 case JVM_CONSTANT_Invalid: {
1325 printf("Invalid");
1326 break;
1327 }
1328 case JVM_CONSTANT_Unicode: {
1329 printf("Unicode %s", WARN_MSG);
1330 break;
1331 }
1332 case JVM_CONSTANT_Utf8: {
1333 u2 len = Bytes::get_Java_u2(bytes);
1334 char str[128];
1335 if (len > 127) {
1336 len = 127;
1337 }
1338 strncpy(str, (char *) (bytes+2), len);
1339 str[len] = '\0';
1340 printf("Utf8 \"%s\"", str);
1341 ent_size = 2 + len;
1342 break;
1343 }
1344 case JVM_CONSTANT_Integer: {
1345 u4 val = Bytes::get_Java_u4(bytes);
1346 printf("int %d", *(int *) &val);
1347 ent_size = 4;
1348 break;
1349 }
1350 case JVM_CONSTANT_Float: {
1351 u4 val = Bytes::get_Java_u4(bytes);
1352 printf("float %5.3ff", *(float *) &val);
1353 ent_size = 4;
1354 break;
1355 }
1356 case JVM_CONSTANT_Long: {
1357 u8 val = Bytes::get_Java_u8(bytes);
1358 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1359 ent_size = 8;
1360 idx++; // Long takes two cpool slots
1361 break;
1362 }
1363 case JVM_CONSTANT_Double: {
1364 u8 val = Bytes::get_Java_u8(bytes);
1365 printf("double %5.3fd", *(jdouble *)&val);
1366 ent_size = 8;
1367 idx++; // Double takes two cpool slots
1368 break;
1369 }
1370 case JVM_CONSTANT_Class: {
1371 idx1 = Bytes::get_Java_u2(bytes);
1372 printf("class #%03d", idx1);
1373 ent_size = 2;
1374 break;
1375 }
1376 case JVM_CONSTANT_String: {
1377 idx1 = Bytes::get_Java_u2(bytes);
1378 printf("String #%03d", idx1);
1379 ent_size = 2;
1380 break;
1381 }
1382 case JVM_CONSTANT_Fieldref: {
1383 idx1 = Bytes::get_Java_u2(bytes);
1384 idx2 = Bytes::get_Java_u2(bytes+2);
1385 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1386 ent_size = 4;
1387 break;
1388 }
1389 case JVM_CONSTANT_Methodref: {
1390 idx1 = Bytes::get_Java_u2(bytes);
1391 idx2 = Bytes::get_Java_u2(bytes+2);
1392 printf("Method #%03d, #%03d", idx1, idx2);
1393 ent_size = 4;
1394 break;
1395 }
1396 case JVM_CONSTANT_InterfaceMethodref: {
1397 idx1 = Bytes::get_Java_u2(bytes);
1398 idx2 = Bytes::get_Java_u2(bytes+2);
1399 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1400 ent_size = 4;
1401 break;
1402 }
1403 case JVM_CONSTANT_NameAndType: {
1404 idx1 = Bytes::get_Java_u2(bytes);
1405 idx2 = Bytes::get_Java_u2(bytes+2);
1406 printf("NameAndType #%03d, #%03d", idx1, idx2);
1407 ent_size = 4;
1408 break;
1409 }
1410 case JVM_CONSTANT_ClassIndex: {
1411 printf("ClassIndex %s", WARN_MSG);
1412 break;
1413 }
1414 case JVM_CONSTANT_UnresolvedClass: {
1415 printf("UnresolvedClass: %s", WARN_MSG);
1416 break;
1417 }
1418 case JVM_CONSTANT_UnresolvedClassInError: {
1419 printf("UnresolvedClassInErr: %s", WARN_MSG);
1420 break;
1421 }
1422 case JVM_CONSTANT_StringIndex: {
1423 printf("StringIndex: %s", WARN_MSG);
1424 break;
1425 }
1426 case JVM_CONSTANT_UnresolvedString: {
1427 printf("UnresolvedString: %s", WARN_MSG);
1428 break;
1429 }
1430 }
1431 printf(";\n");
1432 bytes += ent_size;
1433 size += ent_size;
1434 }
1435 printf("Cpool size: %d\n", size);
1436 fflush(0);
1437 return;
1438 } /* end print_cpool_bytes */
1441 // Returns size of constant pool entry.
1442 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1443 switch(tag_at(idx).value()) {
1444 case JVM_CONSTANT_Invalid:
1445 case JVM_CONSTANT_Unicode:
1446 return 1;
1448 case JVM_CONSTANT_Utf8:
1449 return 3 + symbol_at(idx)->utf8_length();
1451 case JVM_CONSTANT_Class:
1452 case JVM_CONSTANT_String:
1453 case JVM_CONSTANT_ClassIndex:
1454 case JVM_CONSTANT_UnresolvedClass:
1455 case JVM_CONSTANT_UnresolvedClassInError:
1456 case JVM_CONSTANT_StringIndex:
1457 case JVM_CONSTANT_UnresolvedString:
1458 case JVM_CONSTANT_MethodType:
1459 return 3;
1461 case JVM_CONSTANT_MethodHandle:
1462 return 4; //tag, ref_kind, ref_index
1464 case JVM_CONSTANT_Integer:
1465 case JVM_CONSTANT_Float:
1466 case JVM_CONSTANT_Fieldref:
1467 case JVM_CONSTANT_Methodref:
1468 case JVM_CONSTANT_InterfaceMethodref:
1469 case JVM_CONSTANT_NameAndType:
1470 return 5;
1472 case JVM_CONSTANT_InvokeDynamic:
1473 // u1 tag, u2 bsm, u2 nt
1474 return 5;
1476 case JVM_CONSTANT_Long:
1477 case JVM_CONSTANT_Double:
1478 return 9;
1479 }
1480 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1481 return 1;
1482 } /* end cpool_entry_size */
1485 // SymbolHashMap is used to find a constant pool index from a string.
1486 // This function fills in SymbolHashMaps, one for utf8s and one for
1487 // class names, returns size of the cpool raw bytes.
1488 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1489 SymbolHashMap *classmap) {
1490 jint size = 0;
1492 for (u2 idx = 1; idx < length(); idx++) {
1493 u2 tag = tag_at(idx).value();
1494 size += cpool_entry_size(idx);
1496 switch(tag) {
1497 case JVM_CONSTANT_Utf8: {
1498 Symbol* sym = symbol_at(idx);
1499 symmap->add_entry(sym, idx);
1500 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1501 break;
1502 }
1503 case JVM_CONSTANT_Class:
1504 case JVM_CONSTANT_UnresolvedClass:
1505 case JVM_CONSTANT_UnresolvedClassInError: {
1506 Symbol* sym = klass_name_at(idx);
1507 classmap->add_entry(sym, idx);
1508 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1509 break;
1510 }
1511 case JVM_CONSTANT_Long:
1512 case JVM_CONSTANT_Double: {
1513 idx++; // Both Long and Double take two cpool slots
1514 break;
1515 }
1516 }
1517 }
1518 return size;
1519 } /* end hash_utf8_entries_to */
1522 // Copy cpool bytes.
1523 // Returns:
1524 // 0, in case of OutOfMemoryError
1525 // -1, in case of internal error
1526 // > 0, count of the raw cpool bytes that have been copied
1527 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1528 SymbolHashMap* tbl,
1529 unsigned char *bytes) {
1530 u2 idx1, idx2;
1531 jint size = 0;
1532 jint cnt = length();
1533 unsigned char *start_bytes = bytes;
1535 for (jint idx = 1; idx < cnt; idx++) {
1536 u1 tag = tag_at(idx).value();
1537 jint ent_size = cpool_entry_size(idx);
1539 assert(size + ent_size <= cpool_size, "Size mismatch");
1541 *bytes = tag;
1542 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1543 switch(tag) {
1544 case JVM_CONSTANT_Invalid: {
1545 DBG(printf("JVM_CONSTANT_Invalid"));
1546 break;
1547 }
1548 case JVM_CONSTANT_Unicode: {
1549 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1550 DBG(printf("JVM_CONSTANT_Unicode"));
1551 break;
1552 }
1553 case JVM_CONSTANT_Utf8: {
1554 Symbol* sym = symbol_at(idx);
1555 char* str = sym->as_utf8();
1556 // Warning! It's crashing on x86 with len = sym->utf8_length()
1557 int len = (int) strlen(str);
1558 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1559 for (int i = 0; i < len; i++) {
1560 bytes[3+i] = (u1) str[i];
1561 }
1562 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1563 break;
1564 }
1565 case JVM_CONSTANT_Integer: {
1566 jint val = int_at(idx);
1567 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1568 break;
1569 }
1570 case JVM_CONSTANT_Float: {
1571 jfloat val = float_at(idx);
1572 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1573 break;
1574 }
1575 case JVM_CONSTANT_Long: {
1576 jlong val = long_at(idx);
1577 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1578 idx++; // Long takes two cpool slots
1579 break;
1580 }
1581 case JVM_CONSTANT_Double: {
1582 jdouble val = double_at(idx);
1583 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1584 idx++; // Double takes two cpool slots
1585 break;
1586 }
1587 case JVM_CONSTANT_Class:
1588 case JVM_CONSTANT_UnresolvedClass:
1589 case JVM_CONSTANT_UnresolvedClassInError: {
1590 *bytes = JVM_CONSTANT_Class;
1591 Symbol* sym = klass_name_at(idx);
1592 idx1 = tbl->symbol_to_value(sym);
1593 assert(idx1 != 0, "Have not found a hashtable entry");
1594 Bytes::put_Java_u2((address) (bytes+1), idx1);
1595 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1596 break;
1597 }
1598 case JVM_CONSTANT_String: {
1599 unsigned int hash;
1600 char *str = string_at_noresolve(idx);
1601 TempNewSymbol sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1602 if (sym == NULL) {
1603 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1604 // this can happen with JVM TI; see CR 6839599 for more details
1605 oop string = *(obj_at_addr_raw(idx));
1606 assert(java_lang_String::is_instance(string),"Not a String");
1607 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1608 idx1 = 0;
1609 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1610 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1611 int length;
1612 Symbol* s = cur->symbol();
1613 jchar* chars = s->as_unicode(length);
1614 if (java_lang_String::equals(string, chars, length)) {
1615 idx1 = cur->value();
1616 DBG(printf("Index found: %d\n",idx1));
1617 break;
1618 }
1619 }
1620 }
1621 } else {
1622 idx1 = tbl->symbol_to_value(sym);
1623 }
1624 assert(idx1 != 0, "Have not found a hashtable entry");
1625 Bytes::put_Java_u2((address) (bytes+1), idx1);
1626 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1627 break;
1628 }
1629 case JVM_CONSTANT_UnresolvedString: {
1630 *bytes = JVM_CONSTANT_String;
1631 Symbol* sym = unresolved_string_at(idx);
1632 idx1 = tbl->symbol_to_value(sym);
1633 assert(idx1 != 0, "Have not found a hashtable entry");
1634 Bytes::put_Java_u2((address) (bytes+1), idx1);
1635 DBG(char *str = sym->as_utf8());
1636 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1637 break;
1638 }
1639 case JVM_CONSTANT_Fieldref:
1640 case JVM_CONSTANT_Methodref:
1641 case JVM_CONSTANT_InterfaceMethodref: {
1642 idx1 = uncached_klass_ref_index_at(idx);
1643 idx2 = uncached_name_and_type_ref_index_at(idx);
1644 Bytes::put_Java_u2((address) (bytes+1), idx1);
1645 Bytes::put_Java_u2((address) (bytes+3), idx2);
1646 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1647 break;
1648 }
1649 case JVM_CONSTANT_NameAndType: {
1650 idx1 = name_ref_index_at(idx);
1651 idx2 = signature_ref_index_at(idx);
1652 Bytes::put_Java_u2((address) (bytes+1), idx1);
1653 Bytes::put_Java_u2((address) (bytes+3), idx2);
1654 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1655 break;
1656 }
1657 case JVM_CONSTANT_ClassIndex: {
1658 *bytes = JVM_CONSTANT_Class;
1659 idx1 = klass_index_at(idx);
1660 Bytes::put_Java_u2((address) (bytes+1), idx1);
1661 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1662 break;
1663 }
1664 case JVM_CONSTANT_StringIndex: {
1665 *bytes = JVM_CONSTANT_String;
1666 idx1 = string_index_at(idx);
1667 Bytes::put_Java_u2((address) (bytes+1), idx1);
1668 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1669 break;
1670 }
1671 case JVM_CONSTANT_MethodHandle: {
1672 *bytes = JVM_CONSTANT_MethodHandle;
1673 int kind = method_handle_ref_kind_at(idx);
1674 idx1 = method_handle_index_at(idx);
1675 *(bytes+1) = (unsigned char) kind;
1676 Bytes::put_Java_u2((address) (bytes+2), idx1);
1677 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1678 break;
1679 }
1680 case JVM_CONSTANT_MethodType: {
1681 *bytes = JVM_CONSTANT_MethodType;
1682 idx1 = method_type_index_at(idx);
1683 Bytes::put_Java_u2((address) (bytes+1), idx1);
1684 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1685 break;
1686 }
1687 case JVM_CONSTANT_InvokeDynamic: {
1688 *bytes = tag;
1689 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1690 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1691 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1692 Bytes::put_Java_u2((address) (bytes+1), idx1);
1693 Bytes::put_Java_u2((address) (bytes+3), idx2);
1694 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1695 break;
1696 }
1697 }
1698 DBG(printf("\n"));
1699 bytes += ent_size;
1700 size += ent_size;
1701 }
1702 assert(size == cpool_size, "Size mismatch");
1704 // Keep temorarily for debugging until it's stable.
1705 DBG(print_cpool_bytes(cnt, start_bytes));
1706 return (int)(bytes - start_bytes);
1707 } /* end copy_cpool_bytes */
1710 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1711 char *str = sym->as_utf8();
1712 unsigned int hash = compute_hash(str, sym->utf8_length());
1713 unsigned int index = hash % table_size();
1715 // check if already in map
1716 // we prefer the first entry since it is more likely to be what was used in
1717 // the class file
1718 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1719 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1720 if (en->hash() == hash && en->symbol() == sym) {
1721 return; // already there
1722 }
1723 }
1725 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1726 entry->set_next(bucket(index));
1727 _buckets[index].set_entry(entry);
1728 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1729 }
1731 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
1732 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1733 char *str = sym->as_utf8();
1734 int len = sym->utf8_length();
1735 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1736 unsigned int index = hash % table_size();
1737 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1738 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1739 if (en->hash() == hash && en->symbol() == sym) {
1740 return en;
1741 }
1742 }
1743 return NULL;
1744 }