Thu, 13 Jan 2011 22:15:41 -0800
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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 symbolOop.
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 oop entry = *(this_oop->obj_at_addr(which));
59 if (entry->is_klass()) {
60 // Already resolved - return entry.
61 return (klassOop)entry;
62 }
64 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
65 // already has updated the object
66 assert(THREAD->is_Java_thread(), "must be a Java thread");
67 bool do_resolve = false;
68 bool in_error = false;
70 symbolHandle name;
71 Handle loader;
72 { ObjectLocker ol(this_oop, THREAD);
74 if (this_oop->tag_at(which).is_unresolved_klass()) {
75 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
76 in_error = true;
77 } else {
78 do_resolve = true;
79 name = symbolHandle(THREAD, this_oop->unresolved_klass_at(which));
80 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
81 }
82 }
83 } // unlocking constantPool
86 // The original attempt to resolve this constant pool entry failed so find the
87 // original error and throw it again (JVMS 5.4.3).
88 if (in_error) {
89 symbolOop error = SystemDictionary::find_resolution_error(this_oop, which);
90 guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table");
91 ResourceMark rm;
92 // exception text will be the class name
93 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
94 THROW_MSG_0(error, className);
95 }
97 if (do_resolve) {
98 // this_oop must be unlocked during resolve_or_fail
99 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
100 Handle h_prot (THREAD, protection_domain);
101 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
102 KlassHandle k;
103 if (!HAS_PENDING_EXCEPTION) {
104 k = KlassHandle(THREAD, k_oop);
105 // Do access check for klasses
106 verify_constant_pool_resolve(this_oop, k, THREAD);
107 }
109 // Failed to resolve class. We must record the errors so that subsequent attempts
110 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
111 if (HAS_PENDING_EXCEPTION) {
112 ResourceMark rm;
113 symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name());
115 bool throw_orig_error = false;
116 {
117 ObjectLocker ol (this_oop, THREAD);
119 // some other thread has beaten us and has resolved the class.
120 if (this_oop->tag_at(which).is_klass()) {
121 CLEAR_PENDING_EXCEPTION;
122 entry = this_oop->resolved_klass_at(which);
123 return (klassOop)entry;
124 }
126 if (!PENDING_EXCEPTION->
127 is_a(SystemDictionary::LinkageError_klass())) {
128 // Just throw the exception and don't prevent these classes from
129 // being loaded due to virtual machine errors like StackOverflow
130 // and OutOfMemoryError, etc, or if the thread was hit by stop()
131 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
132 }
133 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
134 SystemDictionary::add_resolution_error(this_oop, which, error);
135 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
136 } else {
137 // some other thread has put the class in error state.
138 error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which));
139 assert(!error.is_null(), "checking");
140 throw_orig_error = true;
141 }
142 } // unlocked
144 if (throw_orig_error) {
145 CLEAR_PENDING_EXCEPTION;
146 ResourceMark rm;
147 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
148 THROW_MSG_0(error, className);
149 }
151 return 0;
152 }
154 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
155 // skip resolving the constant pool so that this code get's
156 // called the next time some bytecodes refer to this class.
157 ResourceMark rm;
158 int line_number = -1;
159 const char * source_file = NULL;
160 if (JavaThread::current()->has_last_Java_frame()) {
161 // try to identify the method which called this function.
162 vframeStream vfst(JavaThread::current());
163 if (!vfst.at_end()) {
164 line_number = vfst.method()->line_number_from_bci(vfst.bci());
165 symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
166 if (s != NULL) {
167 source_file = s->as_C_string();
168 }
169 }
170 }
171 if (k() != this_oop->pool_holder()) {
172 // only print something if the classes are different
173 if (source_file != NULL) {
174 tty->print("RESOLVE %s %s %s:%d\n",
175 instanceKlass::cast(this_oop->pool_holder())->external_name(),
176 instanceKlass::cast(k())->external_name(), source_file, line_number);
177 } else {
178 tty->print("RESOLVE %s %s\n",
179 instanceKlass::cast(this_oop->pool_holder())->external_name(),
180 instanceKlass::cast(k())->external_name());
181 }
182 }
183 return k();
184 } else {
185 ObjectLocker ol (this_oop, THREAD);
186 // Only updated constant pool - if it is resolved.
187 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
188 if (do_resolve) {
189 this_oop->klass_at_put(which, k());
190 }
191 }
192 }
194 entry = this_oop->resolved_klass_at(which);
195 assert(entry->is_klass(), "must be resolved at this point");
196 return (klassOop)entry;
197 }
200 // Does not update constantPoolOop - to avoid any exception throwing. Used
201 // by compiler and exception handling. Also used to avoid classloads for
202 // instanceof operations. Returns NULL if the class has not been loaded or
203 // if the verification of constant pool failed
204 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
205 oop entry = *this_oop->obj_at_addr(which);
206 if (entry->is_klass()) {
207 return (klassOop)entry;
208 } else {
209 assert(entry->is_symbol(), "must be either symbol or klass");
210 Thread *thread = Thread::current();
211 symbolHandle name (thread, (symbolOop)entry);
212 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
213 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
214 Handle h_prot (thread, protection_domain);
215 Handle h_loader (thread, loader);
216 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
218 if (k != NULL) {
219 // Make sure that resolving is legal
220 EXCEPTION_MARK;
221 KlassHandle klass(THREAD, k);
222 // return NULL if verification fails
223 verify_constant_pool_resolve(this_oop, klass, THREAD);
224 if (HAS_PENDING_EXCEPTION) {
225 CLEAR_PENDING_EXCEPTION;
226 return NULL;
227 }
228 return klass();
229 } else {
230 return k;
231 }
232 }
233 }
236 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
237 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
238 }
241 // This is an interface for the compiler that allows accessing non-resolved entries
242 // in the constant pool - but still performs the validations tests. Must be used
243 // in a pre-parse of the compiler - to determine what it can do and not do.
244 // Note: We cannot update the ConstantPool from the vm_thread.
245 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
246 int which = this_oop->klass_ref_index_at(index);
247 oop entry = *this_oop->obj_at_addr(which);
248 if (entry->is_klass()) {
249 return (klassOop)entry;
250 } else {
251 assert(entry->is_symbol(), "must be either symbol or klass");
252 symbolHandle name (THREAD, (symbolOop)entry);
253 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
254 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
255 Handle h_loader(THREAD, loader);
256 Handle h_prot (THREAD, protection_domain);
257 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
259 // Do access check for klasses
260 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
261 return k();
262 }
263 }
266 symbolOop constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
267 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
268 return symbol_at(name_index);
269 }
272 symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
273 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
274 return symbol_at(signature_index);
275 }
278 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
279 int i = which;
280 if (!uncached && cache() != NULL) {
281 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
282 // Invokedynamic index.
283 int pool_index = cache()->main_entry_at(which)->constant_pool_index();
284 if (!AllowTransitionalJSR292 || tag_at(pool_index).is_invoke_dynamic())
285 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
286 assert(tag_at(pool_index).is_name_and_type(), "");
287 return pool_index;
288 }
289 // change byte-ordering and go via cache
290 i = remap_instruction_operand_from_cache(which);
291 } else {
292 if (AllowTransitionalJSR292 && tag_at(which).is_name_and_type())
293 // invokedynamic index is a simple name-and-type
294 return which;
295 if (tag_at(which).is_invoke_dynamic()) {
296 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
297 assert(tag_at(pool_index).is_name_and_type(), "");
298 return pool_index;
299 }
300 }
301 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
302 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
303 jint ref_index = *int_at_addr(i);
304 return extract_high_short_from_int(ref_index);
305 }
308 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
309 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
310 "an invokedynamic instruction does not have a klass");
311 int i = which;
312 if (!uncached && cache() != NULL) {
313 // change byte-ordering and go via cache
314 i = remap_instruction_operand_from_cache(which);
315 }
316 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
317 jint ref_index = *int_at_addr(i);
318 return extract_low_short_from_int(ref_index);
319 }
323 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
324 int cpc_index = operand;
325 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
326 assert((int)(u2)cpc_index == cpc_index, "clean u2");
327 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
328 return member_index;
329 }
332 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
333 if (k->oop_is_instance() || k->oop_is_objArray()) {
334 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
335 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
336 KlassHandle element (THREAD, elem_oop);
338 // The element type could be a typeArray - we only need the access check if it is
339 // an reference to another class
340 if (element->oop_is_instance()) {
341 LinkResolver::check_klass_accessability(holder, element, CHECK);
342 }
343 }
344 }
347 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
348 jint ref_index = name_and_type_at(which_nt);
349 return extract_low_short_from_int(ref_index);
350 }
353 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
354 jint ref_index = name_and_type_at(which_nt);
355 return extract_high_short_from_int(ref_index);
356 }
359 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
360 return klass_at(klass_ref_index_at(which), CHECK_NULL);
361 }
364 symbolOop constantPoolOopDesc::klass_name_at(int which) {
365 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
366 "Corrupted constant pool");
367 // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
368 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
369 // tag is not updated atomicly.
370 oop entry = *(obj_at_addr(which));
371 if (entry->is_klass()) {
372 // Already resolved - return entry's name.
373 return klassOop(entry)->klass_part()->name();
374 } else {
375 assert(entry->is_symbol(), "must be either symbol or klass");
376 return (symbolOop)entry;
377 }
378 }
380 symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) {
381 jint ref_index = klass_ref_index_at(which);
382 return klass_at_noresolve(ref_index);
383 }
385 symbolOop constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) {
386 jint ref_index = uncached_klass_ref_index_at(which);
387 return klass_at_noresolve(ref_index);
388 }
390 char* constantPoolOopDesc::string_at_noresolve(int which) {
391 // Test entry type in case string is resolved while in here.
392 oop entry = *(obj_at_addr(which));
393 if (entry->is_symbol()) {
394 return ((symbolOop)entry)->as_C_string();
395 } else if (java_lang_String::is_instance(entry)) {
396 return java_lang_String::as_utf8_string(entry);
397 } else {
398 return (char*)"<pseudo-string>";
399 }
400 }
403 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
404 return FieldType::basic_type(symbol_at(which));
405 }
408 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
409 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
410 if (this_oop->tag_at(index).is_unresolved_string()) {
411 this_oop->string_at(index, CHECK);
412 }
413 }
414 }
416 // A resolved constant value in the CP cache is represented as a non-null
417 // value. As a special case, this value can be a 'systemObjArray'
418 // which masks an exception object to throw.
419 // This allows a MethodHandle constant reference to throw a consistent
420 // exception every time, if it fails to resolve.
421 static oop decode_exception_from_f1(oop result_oop, TRAPS) {
422 if (result_oop->klass() != Universe::systemObjArrayKlassObj())
423 return result_oop;
425 // Special cases here: Masked null, saved exception.
426 objArrayOop sys_array = (objArrayOop) result_oop;
427 assert(sys_array->length() == 1, "bad system array");
428 if (sys_array->length() == 1) {
429 THROW_OOP_(sys_array->obj_at(0), NULL);
430 }
431 return NULL;
432 }
434 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
435 oop result_oop = NULL;
436 Handle throw_exception;
438 if (cache_index == _possible_index_sentinel) {
439 // It is possible that this constant is one which is cached in the CP cache.
440 // We'll do a linear search. This should be OK because this usage is rare.
441 assert(index > 0, "valid index");
442 constantPoolCacheOop cache = this_oop()->cache();
443 for (int i = 0, len = cache->length(); i < len; i++) {
444 ConstantPoolCacheEntry* cpc_entry = cache->entry_at(i);
445 if (!cpc_entry->is_secondary_entry() && cpc_entry->constant_pool_index() == index) {
446 // Switch the query to use this CPC entry.
447 cache_index = i;
448 index = _no_index_sentinel;
449 break;
450 }
451 }
452 if (cache_index == _possible_index_sentinel)
453 cache_index = _no_index_sentinel; // not found
454 }
455 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
456 assert(index == _no_index_sentinel || index >= 0, "");
458 if (cache_index >= 0) {
459 assert(index == _no_index_sentinel, "only one kind of index at a time");
460 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
461 result_oop = cpc_entry->f1();
462 if (result_oop != NULL) {
463 return decode_exception_from_f1(result_oop, THREAD);
464 // That was easy...
465 }
466 index = cpc_entry->constant_pool_index();
467 }
469 jvalue prim_value; // temp used only in a few cases below
471 int tag_value = this_oop->tag_at(index).value();
472 switch (tag_value) {
474 case JVM_CONSTANT_UnresolvedClass:
475 case JVM_CONSTANT_UnresolvedClassInError:
476 case JVM_CONSTANT_Class:
477 {
478 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL);
479 // ldc wants the java mirror.
480 result_oop = resolved->klass_part()->java_mirror();
481 break;
482 }
484 case JVM_CONSTANT_String:
485 case JVM_CONSTANT_UnresolvedString:
486 if (this_oop->is_pseudo_string_at(index)) {
487 result_oop = this_oop->pseudo_string_at(index);
488 break;
489 }
490 result_oop = string_at_impl(this_oop, index, CHECK_NULL);
491 break;
493 case JVM_CONSTANT_Object:
494 result_oop = this_oop->object_at(index);
495 break;
497 case JVM_CONSTANT_MethodHandle:
498 {
499 int ref_kind = this_oop->method_handle_ref_kind_at(index);
500 int callee_index = this_oop->method_handle_klass_index_at(index);
501 symbolHandle name(THREAD, this_oop->method_handle_name_ref_at(index));
502 symbolHandle signature(THREAD, this_oop->method_handle_signature_ref_at(index));
503 if (PrintMiscellaneous)
504 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
505 ref_kind, index, this_oop->method_handle_index_at(index),
506 callee_index, name->as_C_string(), signature->as_C_string());
507 KlassHandle callee;
508 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
509 callee = KlassHandle(THREAD, k);
510 }
511 KlassHandle klass(THREAD, this_oop->pool_holder());
512 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
513 callee, name, signature,
514 THREAD);
515 if (HAS_PENDING_EXCEPTION) {
516 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
517 CLEAR_PENDING_EXCEPTION;
518 break;
519 }
520 result_oop = value();
521 assert(result_oop != NULL, "");
522 break;
523 }
525 case JVM_CONSTANT_MethodType:
526 {
527 symbolHandle signature(THREAD, this_oop->method_type_signature_at(index));
528 if (PrintMiscellaneous)
529 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
530 index, this_oop->method_type_index_at(index),
531 signature->as_C_string());
532 KlassHandle klass(THREAD, this_oop->pool_holder());
533 bool ignore_is_on_bcp = false;
534 Handle value = SystemDictionary::find_method_handle_type(signature,
535 klass,
536 false,
537 ignore_is_on_bcp,
538 THREAD);
539 if (HAS_PENDING_EXCEPTION) {
540 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
541 CLEAR_PENDING_EXCEPTION;
542 break;
543 }
544 result_oop = value();
545 assert(result_oop != NULL, "");
546 break;
547 }
549 case JVM_CONSTANT_Integer:
550 prim_value.i = this_oop->int_at(index);
551 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
552 break;
554 case JVM_CONSTANT_Float:
555 prim_value.f = this_oop->float_at(index);
556 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
557 break;
559 case JVM_CONSTANT_Long:
560 prim_value.j = this_oop->long_at(index);
561 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
562 break;
564 case JVM_CONSTANT_Double:
565 prim_value.d = this_oop->double_at(index);
566 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
567 break;
569 default:
570 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
571 this_oop(), index, cache_index, tag_value) );
572 assert(false, "unexpected constant tag");
573 break;
574 }
576 if (cache_index >= 0) {
577 // Cache the oop here also.
578 if (throw_exception.not_null()) {
579 objArrayOop sys_array = oopFactory::new_system_objArray(1, CHECK_NULL);
580 sys_array->obj_at_put(0, throw_exception());
581 result_oop = sys_array;
582 throw_exception = Handle(); // be tidy
583 }
584 Handle result_handle(THREAD, result_oop);
585 result_oop = NULL; // safety
586 ObjectLocker ol(this_oop, THREAD);
587 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
588 result_oop = cpc_entry->f1();
589 // Benign race condition: f1 may already be filled in while we were trying to lock.
590 // The important thing here is that all threads pick up the same result.
591 // It doesn't matter which racing thread wins, as long as only one
592 // result is used by all threads, and all future queries.
593 // That result may be either a resolved constant or a failure exception.
594 if (result_oop == NULL) {
595 result_oop = result_handle();
596 cpc_entry->set_f1(result_oop);
597 }
598 return decode_exception_from_f1(result_oop, THREAD);
599 } else {
600 if (throw_exception.not_null()) {
601 THROW_HANDLE_(throw_exception, NULL);
602 }
603 return result_oop;
604 }
605 }
607 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
608 oop entry = *(this_oop->obj_at_addr(which));
609 if (entry->is_symbol()) {
610 ObjectLocker ol(this_oop, THREAD);
611 if (this_oop->tag_at(which).is_unresolved_string()) {
612 // Intern string
613 symbolOop sym = this_oop->unresolved_string_at(which);
614 entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
615 this_oop->string_at_put(which, entry);
616 } else {
617 // Another thread beat us and interned string, read string from constant pool
618 entry = this_oop->resolved_string_at(which);
619 }
620 }
621 assert(java_lang_String::is_instance(entry), "must be string");
622 return entry;
623 }
626 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
627 oop entry = *(obj_at_addr(which));
628 if (entry->is_symbol())
629 // Not yet resolved, but it will resolve to a string.
630 return false;
631 else if (java_lang_String::is_instance(entry))
632 return false; // actually, it might be a non-interned or non-perm string
633 else
634 // truly pseudo
635 return true;
636 }
639 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
640 int which) {
641 // Names are interned, so we can compare symbolOops directly
642 symbolOop cp_name = klass_name_at(which);
643 return (cp_name == k->name());
644 }
647 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
648 ResourceMark rm;
649 int count = 0;
650 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
651 if (tag_at(index).is_unresolved_string()) {
652 // Intern string
653 symbolOop sym = unresolved_string_at(index);
654 oop entry = StringTable::intern(sym, CHECK_(-1));
655 string_at_put(index, entry);
656 }
657 }
658 return count;
659 }
662 // Iterate over symbols which are used as class, field, method names and
663 // signatures (in preparation for writing to the shared archive).
665 void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
666 for (int index = 1; index < length(); index++) { // Index 0 is unused
667 switch (tag_at(index).value()) {
669 case JVM_CONSTANT_UnresolvedClass:
670 closure->do_oop(obj_at_addr(index));
671 break;
673 case JVM_CONSTANT_NameAndType:
674 {
675 int i = *int_at_addr(index);
676 closure->do_oop(obj_at_addr((unsigned)i >> 16));
677 closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
678 }
679 break;
681 case JVM_CONSTANT_Class:
682 case JVM_CONSTANT_InterfaceMethodref:
683 case JVM_CONSTANT_Fieldref:
684 case JVM_CONSTANT_Methodref:
685 case JVM_CONSTANT_Integer:
686 case JVM_CONSTANT_Float:
687 // Do nothing! Not an oop.
688 // These constant types do not reference symbols at this point.
689 break;
691 case JVM_CONSTANT_String:
692 // Do nothing! Not a symbol.
693 break;
695 case JVM_CONSTANT_UnresolvedString:
696 case JVM_CONSTANT_Utf8:
697 // These constants are symbols, but unless these symbols are
698 // actually to be used for something, we don't want to mark them.
699 break;
701 case JVM_CONSTANT_Long:
702 case JVM_CONSTANT_Double:
703 // Do nothing! Not an oop. (But takes two pool entries.)
704 ++index;
705 break;
707 default:
708 ShouldNotReachHere();
709 break;
710 }
711 }
712 }
715 // Iterate over the [one] tags array (in preparation for writing to the
716 // shared archive).
718 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
719 closure->do_oop(tags_addr());
720 closure->do_oop(operands_addr());
721 }
724 // Iterate over String objects (in preparation for writing to the shared
725 // archive).
727 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
728 for (int index = 1; index < length(); index++) { // Index 0 is unused
729 switch (tag_at(index).value()) {
731 case JVM_CONSTANT_UnresolvedClass:
732 case JVM_CONSTANT_NameAndType:
733 // Do nothing! Not a String.
734 break;
736 case JVM_CONSTANT_Class:
737 case JVM_CONSTANT_InterfaceMethodref:
738 case JVM_CONSTANT_Fieldref:
739 case JVM_CONSTANT_Methodref:
740 case JVM_CONSTANT_Integer:
741 case JVM_CONSTANT_Float:
742 // Do nothing! Not an oop.
743 // These constant types do not reference symbols at this point.
744 break;
746 case JVM_CONSTANT_String:
747 closure->do_oop(obj_at_addr(index));
748 break;
750 case JVM_CONSTANT_UnresolvedString:
751 case JVM_CONSTANT_Utf8:
752 // These constants are symbols, but unless these symbols are
753 // actually to be used for something, we don't want to mark them.
754 break;
756 case JVM_CONSTANT_Long:
757 case JVM_CONSTANT_Double:
758 // Do nothing! Not an oop. (But takes two pool entries.)
759 ++index;
760 break;
762 default:
763 ShouldNotReachHere();
764 break;
765 }
766 }
767 }
770 // Compare this constant pool's entry at index1 to the constant pool
771 // cp2's entry at index2.
772 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
773 int index2, TRAPS) {
775 jbyte t1 = tag_at(index1).value();
776 jbyte t2 = cp2->tag_at(index2).value();
779 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
780 // when comparing
781 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
782 t1 = JVM_CONSTANT_UnresolvedClass;
783 }
784 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
785 t2 = JVM_CONSTANT_UnresolvedClass;
786 }
788 if (t1 != t2) {
789 // Not the same entry type so there is nothing else to check. Note
790 // that this style of checking will consider resolved/unresolved
791 // class pairs and resolved/unresolved string pairs as different.
792 // From the constantPoolOop API point of view, this is correct
793 // behavior. See constantPoolKlass::merge() to see how this plays
794 // out in the context of constantPoolOop merging.
795 return false;
796 }
798 switch (t1) {
799 case JVM_CONSTANT_Class:
800 {
801 klassOop k1 = klass_at(index1, CHECK_false);
802 klassOop k2 = cp2->klass_at(index2, CHECK_false);
803 if (k1 == k2) {
804 return true;
805 }
806 } break;
808 case JVM_CONSTANT_ClassIndex:
809 {
810 int recur1 = klass_index_at(index1);
811 int recur2 = cp2->klass_index_at(index2);
812 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
813 if (match) {
814 return true;
815 }
816 } break;
818 case JVM_CONSTANT_Double:
819 {
820 jdouble d1 = double_at(index1);
821 jdouble d2 = cp2->double_at(index2);
822 if (d1 == d2) {
823 return true;
824 }
825 } break;
827 case JVM_CONSTANT_Fieldref:
828 case JVM_CONSTANT_InterfaceMethodref:
829 case JVM_CONSTANT_Methodref:
830 {
831 int recur1 = uncached_klass_ref_index_at(index1);
832 int recur2 = cp2->uncached_klass_ref_index_at(index2);
833 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
834 if (match) {
835 recur1 = uncached_name_and_type_ref_index_at(index1);
836 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
837 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
838 if (match) {
839 return true;
840 }
841 }
842 } break;
844 case JVM_CONSTANT_Float:
845 {
846 jfloat f1 = float_at(index1);
847 jfloat f2 = cp2->float_at(index2);
848 if (f1 == f2) {
849 return true;
850 }
851 } break;
853 case JVM_CONSTANT_Integer:
854 {
855 jint i1 = int_at(index1);
856 jint i2 = cp2->int_at(index2);
857 if (i1 == i2) {
858 return true;
859 }
860 } break;
862 case JVM_CONSTANT_Long:
863 {
864 jlong l1 = long_at(index1);
865 jlong l2 = cp2->long_at(index2);
866 if (l1 == l2) {
867 return true;
868 }
869 } break;
871 case JVM_CONSTANT_NameAndType:
872 {
873 int recur1 = name_ref_index_at(index1);
874 int recur2 = cp2->name_ref_index_at(index2);
875 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
876 if (match) {
877 recur1 = signature_ref_index_at(index1);
878 recur2 = cp2->signature_ref_index_at(index2);
879 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
880 if (match) {
881 return true;
882 }
883 }
884 } break;
886 case JVM_CONSTANT_String:
887 {
888 oop s1 = string_at(index1, CHECK_false);
889 oop s2 = cp2->string_at(index2, CHECK_false);
890 if (s1 == s2) {
891 return true;
892 }
893 } break;
895 case JVM_CONSTANT_StringIndex:
896 {
897 int recur1 = string_index_at(index1);
898 int recur2 = cp2->string_index_at(index2);
899 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
900 if (match) {
901 return true;
902 }
903 } break;
905 case JVM_CONSTANT_UnresolvedClass:
906 {
907 symbolOop k1 = unresolved_klass_at(index1);
908 symbolOop k2 = cp2->unresolved_klass_at(index2);
909 if (k1 == k2) {
910 return true;
911 }
912 } break;
914 case JVM_CONSTANT_MethodType:
915 {
916 int k1 = method_type_index_at(index1);
917 int k2 = cp2->method_type_index_at(index2);
918 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
919 if (match) {
920 return true;
921 }
922 } break;
924 case JVM_CONSTANT_MethodHandle:
925 {
926 int k1 = method_handle_ref_kind_at(index1);
927 int k2 = cp2->method_handle_ref_kind_at(index2);
928 if (k1 == k2) {
929 int i1 = method_handle_index_at(index1);
930 int i2 = cp2->method_handle_index_at(index2);
931 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
932 if (match) {
933 return true;
934 }
935 }
936 } break;
938 case JVM_CONSTANT_InvokeDynamic:
939 case JVM_CONSTANT_InvokeDynamicTrans:
940 {
941 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
942 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
943 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
944 if (!match) return false;
945 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
946 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
947 match = compare_entry_to(k1, cp2, k2, CHECK_false);
948 if (!match) return false;
949 int argc = invoke_dynamic_argument_count_at(index1);
950 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
951 for (int j = 0; j < argc; j++) {
952 k1 = invoke_dynamic_argument_index_at(index1, j);
953 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
954 match = compare_entry_to(k1, cp2, k2, CHECK_false);
955 if (!match) return false;
956 }
957 return true; // got through loop; all elements equal
958 }
959 } break;
961 case JVM_CONSTANT_UnresolvedString:
962 {
963 symbolOop s1 = unresolved_string_at(index1);
964 symbolOop s2 = cp2->unresolved_string_at(index2);
965 if (s1 == s2) {
966 return true;
967 }
968 } break;
970 case JVM_CONSTANT_Utf8:
971 {
972 symbolOop s1 = symbol_at(index1);
973 symbolOop s2 = cp2->symbol_at(index2);
974 if (s1 == s2) {
975 return true;
976 }
977 } break;
979 // Invalid is used as the tag for the second constant pool entry
980 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
981 // not be seen by itself.
982 case JVM_CONSTANT_Invalid: // fall through
984 default:
985 ShouldNotReachHere();
986 break;
987 }
989 return false;
990 } // end compare_entry_to()
993 // Copy this constant pool's entries at start_i to end_i (inclusive)
994 // to the constant pool to_cp's entries starting at to_i. A total of
995 // (end_i - start_i) + 1 entries are copied.
996 void constantPoolOopDesc::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
997 constantPoolHandle to_cp, int to_i, TRAPS) {
999 int dest_i = to_i; // leave original alone for debug purposes
1001 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1002 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1004 switch (from_cp->tag_at(src_i).value()) {
1005 case JVM_CONSTANT_Double:
1006 case JVM_CONSTANT_Long:
1007 // double and long take two constant pool entries
1008 src_i += 2;
1009 dest_i += 2;
1010 break;
1012 default:
1013 // all others take one constant pool entry
1014 src_i++;
1015 dest_i++;
1016 break;
1017 }
1018 }
1020 int from_oplen = operand_array_length(from_cp->operands());
1021 int old_oplen = operand_array_length(to_cp->operands());
1022 if (from_oplen != 0) {
1023 // append my operands to the target's operands array
1024 if (old_oplen == 0) {
1025 to_cp->set_operands(from_cp->operands()); // reuse; do not merge
1026 } else {
1027 int old_len = to_cp->operands()->length();
1028 int from_len = from_cp->operands()->length();
1029 int old_off = old_oplen * sizeof(u2);
1030 int from_off = from_oplen * sizeof(u2);
1031 typeArrayHandle new_operands = oopFactory::new_permanent_shortArray(old_len + from_len, CHECK);
1032 int fillp = 0, len = 0;
1033 // first part of dest
1034 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1035 new_operands->short_at_addr(fillp),
1036 (len = old_off) * sizeof(u2));
1037 fillp += len;
1038 // first part of src
1039 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1040 new_operands->short_at_addr(fillp),
1041 (len = from_off) * sizeof(u2));
1042 fillp += len;
1043 // second part of dest
1044 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(old_off),
1045 new_operands->short_at_addr(fillp),
1046 (len = old_len - old_off) * sizeof(u2));
1047 fillp += len;
1048 // second part of src
1049 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(from_off),
1050 new_operands->short_at_addr(fillp),
1051 (len = from_len - from_off) * sizeof(u2));
1052 fillp += len;
1053 assert(fillp == new_operands->length(), "");
1055 // Adjust indexes in the first part of the copied operands array.
1056 for (int j = 0; j < from_oplen; j++) {
1057 int offset = operand_offset_at(new_operands(), old_oplen + j);
1058 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1059 offset += old_len; // every new tuple is preceded by old_len extra u2's
1060 operand_offset_at_put(new_operands(), old_oplen + j, offset);
1061 }
1063 // replace target operands array with combined array
1064 to_cp->set_operands(new_operands());
1065 }
1066 }
1068 } // end copy_cp_to()
1071 // Copy this constant pool's entry at from_i to the constant pool
1072 // to_cp's entry at to_i.
1073 void constantPoolOopDesc::copy_entry_to(constantPoolHandle from_cp, int from_i,
1074 constantPoolHandle to_cp, int to_i,
1075 TRAPS) {
1077 int tag = from_cp->tag_at(from_i).value();
1078 switch (tag) {
1079 case JVM_CONSTANT_Class:
1080 {
1081 klassOop k = from_cp->klass_at(from_i, CHECK);
1082 to_cp->klass_at_put(to_i, k);
1083 } break;
1085 case JVM_CONSTANT_ClassIndex:
1086 {
1087 jint ki = from_cp->klass_index_at(from_i);
1088 to_cp->klass_index_at_put(to_i, ki);
1089 } break;
1091 case JVM_CONSTANT_Double:
1092 {
1093 jdouble d = from_cp->double_at(from_i);
1094 to_cp->double_at_put(to_i, d);
1095 // double takes two constant pool entries so init second entry's tag
1096 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1097 } break;
1099 case JVM_CONSTANT_Fieldref:
1100 {
1101 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1102 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1103 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1104 } break;
1106 case JVM_CONSTANT_Float:
1107 {
1108 jfloat f = from_cp->float_at(from_i);
1109 to_cp->float_at_put(to_i, f);
1110 } break;
1112 case JVM_CONSTANT_Integer:
1113 {
1114 jint i = from_cp->int_at(from_i);
1115 to_cp->int_at_put(to_i, i);
1116 } break;
1118 case JVM_CONSTANT_InterfaceMethodref:
1119 {
1120 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1121 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1122 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1123 } break;
1125 case JVM_CONSTANT_Long:
1126 {
1127 jlong l = from_cp->long_at(from_i);
1128 to_cp->long_at_put(to_i, l);
1129 // long takes two constant pool entries so init second entry's tag
1130 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1131 } break;
1133 case JVM_CONSTANT_Methodref:
1134 {
1135 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1136 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1137 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1138 } break;
1140 case JVM_CONSTANT_NameAndType:
1141 {
1142 int name_ref_index = from_cp->name_ref_index_at(from_i);
1143 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1144 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1145 } break;
1147 case JVM_CONSTANT_String:
1148 {
1149 oop s = from_cp->string_at(from_i, CHECK);
1150 to_cp->string_at_put(to_i, s);
1151 } break;
1153 case JVM_CONSTANT_StringIndex:
1154 {
1155 jint si = from_cp->string_index_at(from_i);
1156 to_cp->string_index_at_put(to_i, si);
1157 } break;
1159 case JVM_CONSTANT_UnresolvedClass:
1160 {
1161 symbolOop k = from_cp->unresolved_klass_at(from_i);
1162 to_cp->unresolved_klass_at_put(to_i, k);
1163 } break;
1165 case JVM_CONSTANT_UnresolvedClassInError:
1166 {
1167 symbolOop k = from_cp->unresolved_klass_at(from_i);
1168 to_cp->unresolved_klass_at_put(to_i, k);
1169 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1170 } break;
1173 case JVM_CONSTANT_UnresolvedString:
1174 {
1175 symbolOop s = from_cp->unresolved_string_at(from_i);
1176 to_cp->unresolved_string_at_put(to_i, s);
1177 } break;
1179 case JVM_CONSTANT_Utf8:
1180 {
1181 symbolOop s = from_cp->symbol_at(from_i);
1182 to_cp->symbol_at_put(to_i, s);
1183 } break;
1185 case JVM_CONSTANT_MethodType:
1186 {
1187 jint k = from_cp->method_type_index_at(from_i);
1188 to_cp->method_type_index_at_put(to_i, k);
1189 } break;
1191 case JVM_CONSTANT_MethodHandle:
1192 {
1193 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1194 int k2 = from_cp->method_handle_index_at(from_i);
1195 to_cp->method_handle_index_at_put(to_i, k1, k2);
1196 } break;
1198 case JVM_CONSTANT_InvokeDynamicTrans:
1199 {
1200 int k1 = from_cp->invoke_dynamic_bootstrap_method_ref_index_at(from_i);
1201 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1202 to_cp->invoke_dynamic_trans_at_put(to_i, k1, k2);
1203 } break;
1205 case JVM_CONSTANT_InvokeDynamic:
1206 {
1207 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1208 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1209 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1210 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1211 } break;
1213 // Invalid is used as the tag for the second constant pool entry
1214 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1215 // not be seen by itself.
1216 case JVM_CONSTANT_Invalid: // fall through
1218 default:
1219 {
1220 ShouldNotReachHere();
1221 } break;
1222 }
1223 } // end copy_entry_to()
1226 // Search constant pool search_cp for an entry that matches this
1227 // constant pool's entry at pattern_i. Returns the index of a
1228 // matching entry or zero (0) if there is no matching entry.
1229 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1230 constantPoolHandle search_cp, TRAPS) {
1232 // index zero (0) is not used
1233 for (int i = 1; i < search_cp->length(); i++) {
1234 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1235 if (found) {
1236 return i;
1237 }
1238 }
1240 return 0; // entry not found; return unused index zero (0)
1241 } // end find_matching_entry()
1244 #ifndef PRODUCT
1246 const char* constantPoolOopDesc::printable_name_at(int which) {
1248 constantTag tag = tag_at(which);
1250 if (tag.is_unresolved_string() || tag.is_string()) {
1251 return string_at_noresolve(which);
1252 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1253 return klass_name_at(which)->as_C_string();
1254 } else if (tag.is_symbol()) {
1255 return symbol_at(which)->as_C_string();
1256 }
1257 return "";
1258 }
1260 #endif // PRODUCT
1263 // JVMTI GetConstantPool support
1265 // For temporary use until code is stable.
1266 #define DBG(code)
1268 static const char* WARN_MSG = "Must not be such entry!";
1270 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1271 jint size = 0;
1272 u2 idx1, idx2;
1274 for (jint idx = 1; idx < cnt; idx++) {
1275 jint ent_size = 0;
1276 u1 tag = *bytes++;
1277 size++; // count tag
1279 printf("const #%03d, tag: %02d ", idx, tag);
1280 switch(tag) {
1281 case JVM_CONSTANT_Invalid: {
1282 printf("Invalid");
1283 break;
1284 }
1285 case JVM_CONSTANT_Unicode: {
1286 printf("Unicode %s", WARN_MSG);
1287 break;
1288 }
1289 case JVM_CONSTANT_Utf8: {
1290 u2 len = Bytes::get_Java_u2(bytes);
1291 char str[128];
1292 if (len > 127) {
1293 len = 127;
1294 }
1295 strncpy(str, (char *) (bytes+2), len);
1296 str[len] = '\0';
1297 printf("Utf8 \"%s\"", str);
1298 ent_size = 2 + len;
1299 break;
1300 }
1301 case JVM_CONSTANT_Integer: {
1302 u4 val = Bytes::get_Java_u4(bytes);
1303 printf("int %d", *(int *) &val);
1304 ent_size = 4;
1305 break;
1306 }
1307 case JVM_CONSTANT_Float: {
1308 u4 val = Bytes::get_Java_u4(bytes);
1309 printf("float %5.3ff", *(float *) &val);
1310 ent_size = 4;
1311 break;
1312 }
1313 case JVM_CONSTANT_Long: {
1314 u8 val = Bytes::get_Java_u8(bytes);
1315 printf("long "INT64_FORMAT, *(jlong *) &val);
1316 ent_size = 8;
1317 idx++; // Long takes two cpool slots
1318 break;
1319 }
1320 case JVM_CONSTANT_Double: {
1321 u8 val = Bytes::get_Java_u8(bytes);
1322 printf("double %5.3fd", *(jdouble *)&val);
1323 ent_size = 8;
1324 idx++; // Double takes two cpool slots
1325 break;
1326 }
1327 case JVM_CONSTANT_Class: {
1328 idx1 = Bytes::get_Java_u2(bytes);
1329 printf("class #%03d", idx1);
1330 ent_size = 2;
1331 break;
1332 }
1333 case JVM_CONSTANT_String: {
1334 idx1 = Bytes::get_Java_u2(bytes);
1335 printf("String #%03d", idx1);
1336 ent_size = 2;
1337 break;
1338 }
1339 case JVM_CONSTANT_Fieldref: {
1340 idx1 = Bytes::get_Java_u2(bytes);
1341 idx2 = Bytes::get_Java_u2(bytes+2);
1342 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1343 ent_size = 4;
1344 break;
1345 }
1346 case JVM_CONSTANT_Methodref: {
1347 idx1 = Bytes::get_Java_u2(bytes);
1348 idx2 = Bytes::get_Java_u2(bytes+2);
1349 printf("Method #%03d, #%03d", idx1, idx2);
1350 ent_size = 4;
1351 break;
1352 }
1353 case JVM_CONSTANT_InterfaceMethodref: {
1354 idx1 = Bytes::get_Java_u2(bytes);
1355 idx2 = Bytes::get_Java_u2(bytes+2);
1356 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1357 ent_size = 4;
1358 break;
1359 }
1360 case JVM_CONSTANT_NameAndType: {
1361 idx1 = Bytes::get_Java_u2(bytes);
1362 idx2 = Bytes::get_Java_u2(bytes+2);
1363 printf("NameAndType #%03d, #%03d", idx1, idx2);
1364 ent_size = 4;
1365 break;
1366 }
1367 case JVM_CONSTANT_ClassIndex: {
1368 printf("ClassIndex %s", WARN_MSG);
1369 break;
1370 }
1371 case JVM_CONSTANT_UnresolvedClass: {
1372 printf("UnresolvedClass: %s", WARN_MSG);
1373 break;
1374 }
1375 case JVM_CONSTANT_UnresolvedClassInError: {
1376 printf("UnresolvedClassInErr: %s", WARN_MSG);
1377 break;
1378 }
1379 case JVM_CONSTANT_StringIndex: {
1380 printf("StringIndex: %s", WARN_MSG);
1381 break;
1382 }
1383 case JVM_CONSTANT_UnresolvedString: {
1384 printf("UnresolvedString: %s", WARN_MSG);
1385 break;
1386 }
1387 }
1388 printf(";\n");
1389 bytes += ent_size;
1390 size += ent_size;
1391 }
1392 printf("Cpool size: %d\n", size);
1393 fflush(0);
1394 return;
1395 } /* end print_cpool_bytes */
1398 // Returns size of constant pool entry.
1399 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1400 switch(tag_at(idx).value()) {
1401 case JVM_CONSTANT_Invalid:
1402 case JVM_CONSTANT_Unicode:
1403 return 1;
1405 case JVM_CONSTANT_Utf8:
1406 return 3 + symbol_at(idx)->utf8_length();
1408 case JVM_CONSTANT_Class:
1409 case JVM_CONSTANT_String:
1410 case JVM_CONSTANT_ClassIndex:
1411 case JVM_CONSTANT_UnresolvedClass:
1412 case JVM_CONSTANT_UnresolvedClassInError:
1413 case JVM_CONSTANT_StringIndex:
1414 case JVM_CONSTANT_UnresolvedString:
1415 case JVM_CONSTANT_MethodType:
1416 return 3;
1418 case JVM_CONSTANT_MethodHandle:
1419 return 4; //tag, ref_kind, ref_index
1421 case JVM_CONSTANT_Integer:
1422 case JVM_CONSTANT_Float:
1423 case JVM_CONSTANT_Fieldref:
1424 case JVM_CONSTANT_Methodref:
1425 case JVM_CONSTANT_InterfaceMethodref:
1426 case JVM_CONSTANT_NameAndType:
1427 return 5;
1429 case JVM_CONSTANT_InvokeDynamic:
1430 case JVM_CONSTANT_InvokeDynamicTrans:
1431 // u1 tag, u2 bsm, u2 nt
1432 return 5;
1434 case JVM_CONSTANT_Long:
1435 case JVM_CONSTANT_Double:
1436 return 9;
1437 }
1438 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1439 return 1;
1440 } /* end cpool_entry_size */
1443 // SymbolHashMap is used to find a constant pool index from a string.
1444 // This function fills in SymbolHashMaps, one for utf8s and one for
1445 // class names, returns size of the cpool raw bytes.
1446 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1447 SymbolHashMap *classmap) {
1448 jint size = 0;
1450 for (u2 idx = 1; idx < length(); idx++) {
1451 u2 tag = tag_at(idx).value();
1452 size += cpool_entry_size(idx);
1454 switch(tag) {
1455 case JVM_CONSTANT_Utf8: {
1456 symbolOop sym = symbol_at(idx);
1457 symmap->add_entry(sym, idx);
1458 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1459 break;
1460 }
1461 case JVM_CONSTANT_Class:
1462 case JVM_CONSTANT_UnresolvedClass:
1463 case JVM_CONSTANT_UnresolvedClassInError: {
1464 symbolOop sym = klass_name_at(idx);
1465 classmap->add_entry(sym, idx);
1466 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1467 break;
1468 }
1469 case JVM_CONSTANT_Long:
1470 case JVM_CONSTANT_Double: {
1471 idx++; // Both Long and Double take two cpool slots
1472 break;
1473 }
1474 }
1475 }
1476 return size;
1477 } /* end hash_utf8_entries_to */
1480 // Copy cpool bytes.
1481 // Returns:
1482 // 0, in case of OutOfMemoryError
1483 // -1, in case of internal error
1484 // > 0, count of the raw cpool bytes that have been copied
1485 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1486 SymbolHashMap* tbl,
1487 unsigned char *bytes) {
1488 u2 idx1, idx2;
1489 jint size = 0;
1490 jint cnt = length();
1491 unsigned char *start_bytes = bytes;
1493 for (jint idx = 1; idx < cnt; idx++) {
1494 u1 tag = tag_at(idx).value();
1495 jint ent_size = cpool_entry_size(idx);
1497 assert(size + ent_size <= cpool_size, "Size mismatch");
1499 *bytes = tag;
1500 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1501 switch(tag) {
1502 case JVM_CONSTANT_Invalid: {
1503 DBG(printf("JVM_CONSTANT_Invalid"));
1504 break;
1505 }
1506 case JVM_CONSTANT_Unicode: {
1507 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1508 DBG(printf("JVM_CONSTANT_Unicode"));
1509 break;
1510 }
1511 case JVM_CONSTANT_Utf8: {
1512 symbolOop sym = symbol_at(idx);
1513 char* str = sym->as_utf8();
1514 // Warning! It's crashing on x86 with len = sym->utf8_length()
1515 int len = (int) strlen(str);
1516 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1517 for (int i = 0; i < len; i++) {
1518 bytes[3+i] = (u1) str[i];
1519 }
1520 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1521 break;
1522 }
1523 case JVM_CONSTANT_Integer: {
1524 jint val = int_at(idx);
1525 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1526 break;
1527 }
1528 case JVM_CONSTANT_Float: {
1529 jfloat val = float_at(idx);
1530 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1531 break;
1532 }
1533 case JVM_CONSTANT_Long: {
1534 jlong val = long_at(idx);
1535 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1536 idx++; // Long takes two cpool slots
1537 break;
1538 }
1539 case JVM_CONSTANT_Double: {
1540 jdouble val = double_at(idx);
1541 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1542 idx++; // Double takes two cpool slots
1543 break;
1544 }
1545 case JVM_CONSTANT_Class:
1546 case JVM_CONSTANT_UnresolvedClass:
1547 case JVM_CONSTANT_UnresolvedClassInError: {
1548 *bytes = JVM_CONSTANT_Class;
1549 symbolOop sym = klass_name_at(idx);
1550 idx1 = tbl->symbol_to_value(sym);
1551 assert(idx1 != 0, "Have not found a hashtable entry");
1552 Bytes::put_Java_u2((address) (bytes+1), idx1);
1553 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1554 break;
1555 }
1556 case JVM_CONSTANT_String: {
1557 unsigned int hash;
1558 char *str = string_at_noresolve(idx);
1559 symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1560 if (sym == NULL) {
1561 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1562 // this can happen with JVM TI; see CR 6839599 for more details
1563 oop string = *(obj_at_addr(idx));
1564 assert(java_lang_String::is_instance(string),"Not a String");
1565 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1566 idx1 = 0;
1567 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1568 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1569 int length;
1570 sym = cur->symbol();
1571 jchar* chars = sym->as_unicode(length);
1572 if (java_lang_String::equals(string, chars, length)) {
1573 idx1 = cur->value();
1574 DBG(printf("Index found: %d\n",idx1));
1575 break;
1576 }
1577 }
1578 }
1579 } else {
1580 idx1 = tbl->symbol_to_value(sym);
1581 }
1582 assert(idx1 != 0, "Have not found a hashtable entry");
1583 Bytes::put_Java_u2((address) (bytes+1), idx1);
1584 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1585 break;
1586 }
1587 case JVM_CONSTANT_UnresolvedString: {
1588 *bytes = JVM_CONSTANT_String;
1589 symbolOop sym = unresolved_string_at(idx);
1590 idx1 = tbl->symbol_to_value(sym);
1591 assert(idx1 != 0, "Have not found a hashtable entry");
1592 Bytes::put_Java_u2((address) (bytes+1), idx1);
1593 DBG(char *str = sym->as_utf8());
1594 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1595 break;
1596 }
1597 case JVM_CONSTANT_Fieldref:
1598 case JVM_CONSTANT_Methodref:
1599 case JVM_CONSTANT_InterfaceMethodref: {
1600 idx1 = uncached_klass_ref_index_at(idx);
1601 idx2 = uncached_name_and_type_ref_index_at(idx);
1602 Bytes::put_Java_u2((address) (bytes+1), idx1);
1603 Bytes::put_Java_u2((address) (bytes+3), idx2);
1604 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1605 break;
1606 }
1607 case JVM_CONSTANT_NameAndType: {
1608 idx1 = name_ref_index_at(idx);
1609 idx2 = signature_ref_index_at(idx);
1610 Bytes::put_Java_u2((address) (bytes+1), idx1);
1611 Bytes::put_Java_u2((address) (bytes+3), idx2);
1612 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1613 break;
1614 }
1615 case JVM_CONSTANT_ClassIndex: {
1616 *bytes = JVM_CONSTANT_Class;
1617 idx1 = klass_index_at(idx);
1618 Bytes::put_Java_u2((address) (bytes+1), idx1);
1619 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1620 break;
1621 }
1622 case JVM_CONSTANT_StringIndex: {
1623 *bytes = JVM_CONSTANT_String;
1624 idx1 = string_index_at(idx);
1625 Bytes::put_Java_u2((address) (bytes+1), idx1);
1626 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1627 break;
1628 }
1629 case JVM_CONSTANT_MethodHandle: {
1630 *bytes = JVM_CONSTANT_MethodHandle;
1631 int kind = method_handle_ref_kind_at(idx);
1632 idx1 = method_handle_index_at(idx);
1633 *(bytes+1) = (unsigned char) kind;
1634 Bytes::put_Java_u2((address) (bytes+2), idx1);
1635 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1636 break;
1637 }
1638 case JVM_CONSTANT_MethodType: {
1639 *bytes = JVM_CONSTANT_MethodType;
1640 idx1 = method_type_index_at(idx);
1641 Bytes::put_Java_u2((address) (bytes+1), idx1);
1642 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1643 break;
1644 }
1645 case JVM_CONSTANT_InvokeDynamicTrans:
1646 case JVM_CONSTANT_InvokeDynamic: {
1647 *bytes = tag;
1648 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1649 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1650 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1651 Bytes::put_Java_u2((address) (bytes+1), idx1);
1652 Bytes::put_Java_u2((address) (bytes+3), idx2);
1653 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1654 break;
1655 }
1656 }
1657 DBG(printf("\n"));
1658 bytes += ent_size;
1659 size += ent_size;
1660 }
1661 assert(size == cpool_size, "Size mismatch");
1663 // Keep temorarily for debugging until it's stable.
1664 DBG(print_cpool_bytes(cnt, start_bytes));
1665 return (int)(bytes - start_bytes);
1666 } /* end copy_cpool_bytes */
1669 void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
1670 char *str = sym->as_utf8();
1671 unsigned int hash = compute_hash(str, sym->utf8_length());
1672 unsigned int index = hash % table_size();
1674 // check if already in map
1675 // we prefer the first entry since it is more likely to be what was used in
1676 // the class file
1677 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1678 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1679 if (en->hash() == hash && en->symbol() == sym) {
1680 return; // already there
1681 }
1682 }
1684 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1685 entry->set_next(bucket(index));
1686 _buckets[index].set_entry(entry);
1687 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1688 }
1690 SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
1691 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1692 char *str = sym->as_utf8();
1693 int len = sym->utf8_length();
1694 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1695 unsigned int index = hash % table_size();
1696 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1697 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1698 if (en->hash() == hash && en->symbol() == sym) {
1699 return en;
1700 }
1701 }
1702 return NULL;
1703 }