Tue, 24 Jul 2012 10:51:00 -0700
7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/constantPoolOop.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/objArrayKlass.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "runtime/fieldType.hpp"
38 #include "runtime/init.hpp"
39 #include "runtime/signature.hpp"
40 #include "runtime/vframe.hpp"
42 void constantPoolOopDesc::set_flag_at(FlagBit fb) {
43 const int MAX_STATE_CHANGES = 2;
44 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
45 int oflags = _flags;
46 int nflags = oflags | (1 << (int)fb);
47 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
48 return;
49 }
50 assert(false, "failed to cmpxchg flags");
51 _flags |= (1 << (int)fb); // better than nothing
52 }
54 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
55 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
56 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
57 // tag is not updated atomicly.
58 CPSlot entry = this_oop->slot_at(which);
59 if (entry.is_oop()) {
60 assert(entry.get_oop()->is_klass(), "must be");
61 // Already resolved - return entry.
62 return (klassOop)entry.get_oop();
63 }
65 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
66 // already has updated the object
67 assert(THREAD->is_Java_thread(), "must be a Java thread");
68 bool do_resolve = false;
69 bool in_error = false;
71 Symbol* name = NULL;
72 Handle loader;
73 { ObjectLocker ol(this_oop, THREAD);
75 if (this_oop->tag_at(which).is_unresolved_klass()) {
76 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
77 in_error = true;
78 } else {
79 do_resolve = true;
80 name = this_oop->unresolved_klass_at(which);
81 loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
82 }
83 }
84 } // unlocking constantPool
87 // The original attempt to resolve this constant pool entry failed so find the
88 // original error and throw it again (JVMS 5.4.3).
89 if (in_error) {
90 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
91 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
92 ResourceMark rm;
93 // exception text will be the class name
94 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
95 THROW_MSG_0(error, className);
96 }
98 if (do_resolve) {
99 // this_oop must be unlocked during resolve_or_fail
100 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
101 Handle h_prot (THREAD, protection_domain);
102 klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
103 KlassHandle k;
104 if (!HAS_PENDING_EXCEPTION) {
105 k = KlassHandle(THREAD, k_oop);
106 // Do access check for klasses
107 verify_constant_pool_resolve(this_oop, k, THREAD);
108 }
110 // Failed to resolve class. We must record the errors so that subsequent attempts
111 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
112 if (HAS_PENDING_EXCEPTION) {
113 ResourceMark rm;
114 Symbol* error = PENDING_EXCEPTION->klass()->klass_part()->name();
116 bool throw_orig_error = false;
117 {
118 ObjectLocker ol (this_oop, THREAD);
120 // some other thread has beaten us and has resolved the class.
121 if (this_oop->tag_at(which).is_klass()) {
122 CLEAR_PENDING_EXCEPTION;
123 entry = this_oop->resolved_klass_at(which);
124 return (klassOop)entry.get_oop();
125 }
127 if (!PENDING_EXCEPTION->
128 is_a(SystemDictionary::LinkageError_klass())) {
129 // Just throw the exception and don't prevent these classes from
130 // being loaded due to virtual machine errors like StackOverflow
131 // and OutOfMemoryError, etc, or if the thread was hit by stop()
132 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
133 }
134 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
135 SystemDictionary::add_resolution_error(this_oop, which, error);
136 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
137 } else {
138 // some other thread has put the class in error state.
139 error = SystemDictionary::find_resolution_error(this_oop, which);
140 assert(error != NULL, "checking");
141 throw_orig_error = true;
142 }
143 } // unlocked
145 if (throw_orig_error) {
146 CLEAR_PENDING_EXCEPTION;
147 ResourceMark rm;
148 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
149 THROW_MSG_0(error, className);
150 }
152 return 0;
153 }
155 if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
156 // skip resolving the constant pool so that this code get's
157 // called the next time some bytecodes refer to this class.
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = NULL;
161 if (JavaThread::current()->has_last_Java_frame()) {
162 // try to identify the method which called this function.
163 vframeStream vfst(JavaThread::current());
164 if (!vfst.at_end()) {
165 line_number = vfst.method()->line_number_from_bci(vfst.bci());
166 Symbol* s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
167 if (s != NULL) {
168 source_file = s->as_C_string();
169 }
170 }
171 }
172 if (k() != this_oop->pool_holder()) {
173 // only print something if the classes are different
174 if (source_file != NULL) {
175 tty->print("RESOLVE %s %s %s:%d\n",
176 instanceKlass::cast(this_oop->pool_holder())->external_name(),
177 instanceKlass::cast(k())->external_name(), source_file, line_number);
178 } else {
179 tty->print("RESOLVE %s %s\n",
180 instanceKlass::cast(this_oop->pool_holder())->external_name(),
181 instanceKlass::cast(k())->external_name());
182 }
183 }
184 return k();
185 } else {
186 ObjectLocker ol (this_oop, THREAD);
187 // Only updated constant pool - if it is resolved.
188 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
189 if (do_resolve) {
190 this_oop->klass_at_put(which, k());
191 }
192 }
193 }
195 entry = this_oop->resolved_klass_at(which);
196 assert(entry.is_oop() && entry.get_oop()->is_klass(), "must be resolved at this point");
197 return (klassOop)entry.get_oop();
198 }
201 // Does not update constantPoolOop - to avoid any exception throwing. Used
202 // by compiler and exception handling. Also used to avoid classloads for
203 // instanceof operations. Returns NULL if the class has not been loaded or
204 // if the verification of constant pool failed
205 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
206 CPSlot entry = this_oop->slot_at(which);
207 if (entry.is_oop()) {
208 assert(entry.get_oop()->is_klass(), "must be");
209 return (klassOop)entry.get_oop();
210 } else {
211 assert(entry.is_metadata(), "must be either symbol or klass");
212 Thread *thread = Thread::current();
213 Symbol* name = entry.get_symbol();
214 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
215 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
216 Handle h_prot (thread, protection_domain);
217 Handle h_loader (thread, loader);
218 klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
220 if (k != NULL) {
221 // Make sure that resolving is legal
222 EXCEPTION_MARK;
223 KlassHandle klass(THREAD, k);
224 // return NULL if verification fails
225 verify_constant_pool_resolve(this_oop, klass, THREAD);
226 if (HAS_PENDING_EXCEPTION) {
227 CLEAR_PENDING_EXCEPTION;
228 return NULL;
229 }
230 return klass();
231 } else {
232 return k;
233 }
234 }
235 }
238 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
239 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
240 }
243 // This is an interface for the compiler that allows accessing non-resolved entries
244 // in the constant pool - but still performs the validations tests. Must be used
245 // in a pre-parse of the compiler - to determine what it can do and not do.
246 // Note: We cannot update the ConstantPool from the vm_thread.
247 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
248 int which = this_oop->klass_ref_index_at(index);
249 CPSlot entry = this_oop->slot_at(which);
250 if (entry.is_oop()) {
251 assert(entry.get_oop()->is_klass(), "must be");
252 return (klassOop)entry.get_oop();
253 } else {
254 assert(entry.is_metadata(), "must be either symbol or klass");
255 Symbol* name = entry.get_symbol();
256 oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
257 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
258 Handle h_loader(THREAD, loader);
259 Handle h_prot (THREAD, protection_domain);
260 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
262 // Do access check for klasses
263 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
264 return k();
265 }
266 }
269 methodOop constantPoolOopDesc::method_at_if_loaded(constantPoolHandle cpool,
270 int which) {
271 assert(!constantPoolCacheOopDesc::is_secondary_index(which), "no indy instruction here");
272 if (cpool->cache() == NULL) return NULL; // nothing to load yet
273 int cache_index = get_cpcache_index(which);
274 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
275 if (PrintMiscellaneous && (Verbose||WizardMode)) {
276 tty->print_cr("bad operand %d in:", which); cpool->print();
277 }
278 return NULL;
279 }
280 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
281 return e->method_if_resolved(cpool);
282 }
285 bool constantPoolOopDesc::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
286 if (cpool->cache() == NULL) return false; // nothing to load yet
287 // XXX Is there a simpler way to get to the secondary entry?
288 ConstantPoolCacheEntry* e;
289 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
290 e = cpool->cache()->secondary_entry_at(which);
291 } else {
292 int cache_index = get_cpcache_index(which);
293 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
294 if (PrintMiscellaneous && (Verbose||WizardMode)) {
295 tty->print_cr("bad operand %d in:", which); cpool->print();
296 }
297 return false;
298 }
299 e = cpool->cache()->entry_at(cache_index);
300 }
301 return e->has_appendix();
302 }
305 oop constantPoolOopDesc::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
306 if (cpool->cache() == NULL) return NULL; // nothing to load yet
307 // XXX Is there a simpler way to get to the secondary entry?
308 ConstantPoolCacheEntry* e;
309 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
310 e = cpool->cache()->secondary_entry_at(which);
311 } else {
312 int cache_index = get_cpcache_index(which);
313 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
314 if (PrintMiscellaneous && (Verbose||WizardMode)) {
315 tty->print_cr("bad operand %d in:", which); cpool->print();
316 }
317 return NULL;
318 }
319 e = cpool->cache()->entry_at(cache_index);
320 }
321 if (!e->has_appendix()) {
322 return NULL;
323 }
324 return e->f1_as_instance();
325 }
328 Symbol* constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
329 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
330 return symbol_at(name_index);
331 }
334 Symbol* constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
335 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
336 return symbol_at(signature_index);
337 }
340 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
341 int i = which;
342 if (!uncached && cache() != NULL) {
343 if (constantPoolCacheOopDesc::is_secondary_index(which)) {
344 // Invokedynamic index.
345 int pool_index = cache()->main_entry_at(which)->constant_pool_index();
346 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
347 assert(tag_at(pool_index).is_name_and_type(), "");
348 return pool_index;
349 }
350 // change byte-ordering and go via cache
351 i = remap_instruction_operand_from_cache(which);
352 } else {
353 if (tag_at(which).is_invoke_dynamic()) {
354 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
355 assert(tag_at(pool_index).is_name_and_type(), "");
356 return pool_index;
357 }
358 }
359 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
360 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
361 jint ref_index = *int_at_addr(i);
362 return extract_high_short_from_int(ref_index);
363 }
366 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
367 guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
368 "an invokedynamic instruction does not have a klass");
369 int i = which;
370 if (!uncached && cache() != NULL) {
371 // change byte-ordering and go via cache
372 i = remap_instruction_operand_from_cache(which);
373 }
374 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
375 jint ref_index = *int_at_addr(i);
376 return extract_low_short_from_int(ref_index);
377 }
381 int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
382 int cpc_index = operand;
383 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
384 assert((int)(u2)cpc_index == cpc_index, "clean u2");
385 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
386 return member_index;
387 }
390 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
391 if (k->oop_is_instance() || k->oop_is_objArray()) {
392 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
393 klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
394 KlassHandle element (THREAD, elem_oop);
396 // The element type could be a typeArray - we only need the access check if it is
397 // an reference to another class
398 if (element->oop_is_instance()) {
399 LinkResolver::check_klass_accessability(holder, element, CHECK);
400 }
401 }
402 }
405 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
406 jint ref_index = name_and_type_at(which_nt);
407 return extract_low_short_from_int(ref_index);
408 }
411 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
412 jint ref_index = name_and_type_at(which_nt);
413 return extract_high_short_from_int(ref_index);
414 }
417 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
418 return klass_at(klass_ref_index_at(which), CHECK_NULL);
419 }
422 Symbol* constantPoolOopDesc::klass_name_at(int which) {
423 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
424 "Corrupted constant pool");
425 // A resolved constantPool entry will contain a klassOop, otherwise a Symbol*.
426 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
427 // tag is not updated atomicly.
428 CPSlot entry = slot_at(which);
429 if (entry.is_oop()) {
430 // Already resolved - return entry's name.
431 assert(entry.get_oop()->is_klass(), "must be");
432 return klassOop(entry.get_oop())->klass_part()->name();
433 } else {
434 assert(entry.is_metadata(), "must be either symbol or klass");
435 return entry.get_symbol();
436 }
437 }
439 Symbol* constantPoolOopDesc::klass_ref_at_noresolve(int which) {
440 jint ref_index = klass_ref_index_at(which);
441 return klass_at_noresolve(ref_index);
442 }
444 Symbol* constantPoolOopDesc::uncached_klass_ref_at_noresolve(int which) {
445 jint ref_index = uncached_klass_ref_index_at(which);
446 return klass_at_noresolve(ref_index);
447 }
449 char* constantPoolOopDesc::string_at_noresolve(int which) {
450 // Test entry type in case string is resolved while in here.
451 CPSlot entry = slot_at(which);
452 if (entry.is_metadata()) {
453 return (entry.get_symbol())->as_C_string();
454 } else if (java_lang_String::is_instance(entry.get_oop())) {
455 return java_lang_String::as_utf8_string(entry.get_oop());
456 } else {
457 return (char*)"<pseudo-string>";
458 }
459 }
462 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
463 return FieldType::basic_type(symbol_at(which));
464 }
467 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
468 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
469 if (this_oop->tag_at(index).is_unresolved_string()) {
470 this_oop->string_at(index, CHECK);
471 }
472 }
473 }
475 // A resolved constant value in the CP cache is represented as a non-null
476 // value. As a special case, this value can be a 'systemObjArray'
477 // which masks an exception object to throw.
478 // This allows a MethodHandle constant reference to throw a consistent
479 // exception every time, if it fails to resolve.
480 static oop decode_exception_from_f1(oop result_oop, TRAPS) {
481 if (result_oop->klass() != Universe::systemObjArrayKlassObj())
482 return result_oop;
484 // Special cases here: Masked null, saved exception.
485 objArrayOop sys_array = (objArrayOop) result_oop;
486 assert(sys_array->length() == 1, "bad system array");
487 if (sys_array->length() == 1) {
488 THROW_OOP_(sys_array->obj_at(0), NULL);
489 }
490 return NULL;
491 }
493 oop constantPoolOopDesc::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
494 oop result_oop = NULL;
495 Handle throw_exception;
497 if (cache_index == _possible_index_sentinel) {
498 // It is possible that this constant is one which is cached in the CP cache.
499 // We'll do a linear search. This should be OK because this usage is rare.
500 assert(index > 0, "valid index");
501 constantPoolCacheOop cache = this_oop()->cache();
502 for (int i = 0, len = cache->length(); i < len; i++) {
503 ConstantPoolCacheEntry* cpc_entry = cache->entry_at(i);
504 if (!cpc_entry->is_secondary_entry() && cpc_entry->constant_pool_index() == index) {
505 // Switch the query to use this CPC entry.
506 cache_index = i;
507 index = _no_index_sentinel;
508 break;
509 }
510 }
511 if (cache_index == _possible_index_sentinel)
512 cache_index = _no_index_sentinel; // not found
513 }
514 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
515 assert(index == _no_index_sentinel || index >= 0, "");
517 if (cache_index >= 0) {
518 assert(index == _no_index_sentinel, "only one kind of index at a time");
519 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
520 result_oop = cpc_entry->f1_as_instance();
521 if (result_oop != NULL) {
522 return decode_exception_from_f1(result_oop, THREAD);
523 // That was easy...
524 }
525 index = cpc_entry->constant_pool_index();
526 }
528 jvalue prim_value; // temp used only in a few cases below
530 int tag_value = this_oop->tag_at(index).value();
531 switch (tag_value) {
533 case JVM_CONSTANT_UnresolvedClass:
534 case JVM_CONSTANT_UnresolvedClassInError:
535 case JVM_CONSTANT_Class:
536 {
537 klassOop resolved = klass_at_impl(this_oop, index, CHECK_NULL);
538 // ldc wants the java mirror.
539 result_oop = resolved->java_mirror();
540 break;
541 }
543 case JVM_CONSTANT_String:
544 case JVM_CONSTANT_UnresolvedString:
545 if (this_oop->is_pseudo_string_at(index)) {
546 result_oop = this_oop->pseudo_string_at(index);
547 break;
548 }
549 result_oop = string_at_impl(this_oop, index, CHECK_NULL);
550 break;
552 case JVM_CONSTANT_Object:
553 result_oop = this_oop->object_at(index);
554 break;
556 case JVM_CONSTANT_MethodHandle:
557 {
558 int ref_kind = this_oop->method_handle_ref_kind_at(index);
559 int callee_index = this_oop->method_handle_klass_index_at(index);
560 Symbol* name = this_oop->method_handle_name_ref_at(index);
561 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
562 if (PrintMiscellaneous)
563 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
564 ref_kind, index, this_oop->method_handle_index_at(index),
565 callee_index, name->as_C_string(), signature->as_C_string());
566 KlassHandle callee;
567 { klassOop k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
568 callee = KlassHandle(THREAD, k);
569 }
570 KlassHandle klass(THREAD, this_oop->pool_holder());
571 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
572 callee, name, signature,
573 THREAD);
574 if (HAS_PENDING_EXCEPTION) {
575 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
576 CLEAR_PENDING_EXCEPTION;
577 break;
578 }
579 result_oop = value();
580 assert(result_oop != NULL, "");
581 break;
582 }
584 case JVM_CONSTANT_MethodType:
585 {
586 Symbol* signature = this_oop->method_type_signature_at(index);
587 if (PrintMiscellaneous)
588 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
589 index, this_oop->method_type_index_at(index),
590 signature->as_C_string());
591 KlassHandle klass(THREAD, this_oop->pool_holder());
592 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
593 if (HAS_PENDING_EXCEPTION) {
594 throw_exception = Handle(THREAD, PENDING_EXCEPTION);
595 CLEAR_PENDING_EXCEPTION;
596 break;
597 }
598 result_oop = value();
599 assert(result_oop != NULL, "");
600 break;
601 }
603 case JVM_CONSTANT_Integer:
604 prim_value.i = this_oop->int_at(index);
605 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
606 break;
608 case JVM_CONSTANT_Float:
609 prim_value.f = this_oop->float_at(index);
610 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
611 break;
613 case JVM_CONSTANT_Long:
614 prim_value.j = this_oop->long_at(index);
615 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
616 break;
618 case JVM_CONSTANT_Double:
619 prim_value.d = this_oop->double_at(index);
620 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
621 break;
623 default:
624 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
625 this_oop(), index, cache_index, tag_value) );
626 assert(false, "unexpected constant tag");
627 break;
628 }
630 if (cache_index >= 0) {
631 // Cache the oop here also.
632 if (throw_exception.not_null()) {
633 objArrayOop sys_array = oopFactory::new_system_objArray(1, CHECK_NULL);
634 sys_array->obj_at_put(0, throw_exception());
635 result_oop = sys_array;
636 throw_exception = Handle(); // be tidy
637 }
638 Handle result_handle(THREAD, result_oop);
639 result_oop = NULL; // safety
640 ObjectLocker ol(this_oop, THREAD);
641 ConstantPoolCacheEntry* cpc_entry = this_oop->cache()->entry_at(cache_index);
642 result_oop = cpc_entry->f1_as_instance();
643 // Benign race condition: f1 may already be filled in while we were trying to lock.
644 // The important thing here is that all threads pick up the same result.
645 // It doesn't matter which racing thread wins, as long as only one
646 // result is used by all threads, and all future queries.
647 // That result may be either a resolved constant or a failure exception.
648 if (result_oop == NULL) {
649 result_oop = result_handle();
650 cpc_entry->set_f1(result_oop);
651 }
652 return decode_exception_from_f1(result_oop, THREAD);
653 } else {
654 if (throw_exception.not_null()) {
655 THROW_HANDLE_(throw_exception, NULL);
656 }
657 return result_oop;
658 }
659 }
662 oop constantPoolOopDesc::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
663 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
665 Handle bsm;
666 int argc;
667 {
668 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
669 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
670 // It is accompanied by the optional arguments.
671 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
672 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
673 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
674 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
675 }
677 // Extract the optional static arguments.
678 argc = this_oop->invoke_dynamic_argument_count_at(index);
679 if (argc == 0) return bsm_oop;
681 bsm = Handle(THREAD, bsm_oop);
682 }
684 objArrayHandle info;
685 {
686 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
687 info = objArrayHandle(THREAD, info_oop);
688 }
690 info->obj_at_put(0, bsm());
691 for (int i = 0; i < argc; i++) {
692 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
693 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
694 info->obj_at_put(1+i, arg_oop);
695 }
697 return info();
698 }
700 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
701 oop str = NULL;
702 CPSlot entry = this_oop->slot_at(which);
703 if (entry.is_metadata()) {
704 ObjectLocker ol(this_oop, THREAD);
705 if (this_oop->tag_at(which).is_unresolved_string()) {
706 // Intern string
707 Symbol* sym = this_oop->unresolved_string_at(which);
708 str = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
709 this_oop->string_at_put(which, str);
710 } else {
711 // Another thread beat us and interned string, read string from constant pool
712 str = this_oop->resolved_string_at(which);
713 }
714 } else {
715 str = entry.get_oop();
716 }
717 assert(java_lang_String::is_instance(str), "must be string");
718 return str;
719 }
722 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
723 CPSlot entry = slot_at(which);
724 if (entry.is_metadata())
725 // Not yet resolved, but it will resolve to a string.
726 return false;
727 else if (java_lang_String::is_instance(entry.get_oop()))
728 return false; // actually, it might be a non-interned or non-perm string
729 else
730 // truly pseudo
731 return true;
732 }
735 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
736 int which) {
737 // Names are interned, so we can compare Symbol*s directly
738 Symbol* cp_name = klass_name_at(which);
739 return (cp_name == k->name());
740 }
743 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
744 ResourceMark rm;
745 int count = 0;
746 for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
747 if (tag_at(index).is_unresolved_string()) {
748 // Intern string
749 Symbol* sym = unresolved_string_at(index);
750 oop entry = StringTable::intern(sym, CHECK_(-1));
751 string_at_put(index, entry);
752 }
753 }
754 return count;
755 }
757 // Iterate over symbols and decrement ones which are Symbol*s.
758 // This is done during GC so do not need to lock constantPool unless we
759 // have per-thread safepoints.
760 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
761 // these symbols but didn't increment the reference count.
762 void constantPoolOopDesc::unreference_symbols() {
763 for (int index = 1; index < length(); index++) { // Index 0 is unused
764 constantTag tag = tag_at(index);
765 if (tag.is_symbol()) {
766 symbol_at(index)->decrement_refcount();
767 }
768 }
769 }
771 // Iterate over symbols which are used as class, field, method names and
772 // signatures (in preparation for writing to the shared archive).
774 void constantPoolOopDesc::shared_symbols_iterate(SymbolClosure* closure) {
775 for (int index = 1; index < length(); index++) { // Index 0 is unused
776 switch (tag_at(index).value()) {
778 case JVM_CONSTANT_UnresolvedClass:
779 case JVM_CONSTANT_UnresolvedString:
780 case JVM_CONSTANT_Utf8:
781 assert(slot_at(index).is_metadata(), "must be symbol");
782 closure->do_symbol(symbol_at_addr(index));
783 break;
785 case JVM_CONSTANT_NameAndType:
786 {
787 int i = *int_at_addr(index);
788 closure->do_symbol(symbol_at_addr((unsigned)i >> 16));
789 closure->do_symbol(symbol_at_addr((unsigned)i & 0xffff));
790 }
791 break;
793 case JVM_CONSTANT_Class:
794 case JVM_CONSTANT_InterfaceMethodref:
795 case JVM_CONSTANT_Fieldref:
796 case JVM_CONSTANT_Methodref:
797 case JVM_CONSTANT_Integer:
798 case JVM_CONSTANT_Float:
799 // Do nothing! Not an oop.
800 // These constant types do not reference symbols at this point.
801 break;
803 case JVM_CONSTANT_String:
804 // Do nothing! Not a symbol.
805 break;
807 case JVM_CONSTANT_Long:
808 case JVM_CONSTANT_Double:
809 // Do nothing! Not an oop. (But takes two pool entries.)
810 ++index;
811 break;
813 default:
814 ShouldNotReachHere();
815 break;
816 }
817 }
818 }
821 // Iterate over the [one] tags array (in preparation for writing to the
822 // shared archive).
824 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
825 closure->do_oop(tags_addr());
826 closure->do_oop(operands_addr());
827 }
830 // Iterate over String objects (in preparation for writing to the shared
831 // archive).
833 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
834 for (int index = 1; index < length(); index++) { // Index 0 is unused
835 switch (tag_at(index).value()) {
837 case JVM_CONSTANT_UnresolvedClass:
838 case JVM_CONSTANT_NameAndType:
839 // Do nothing! Not a String.
840 break;
842 case JVM_CONSTANT_Class:
843 case JVM_CONSTANT_InterfaceMethodref:
844 case JVM_CONSTANT_Fieldref:
845 case JVM_CONSTANT_Methodref:
846 case JVM_CONSTANT_Integer:
847 case JVM_CONSTANT_Float:
848 // Do nothing! Not an oop.
849 // These constant types do not reference symbols at this point.
850 break;
852 case JVM_CONSTANT_String:
853 closure->do_oop(obj_at_addr_raw(index));
854 break;
856 case JVM_CONSTANT_UnresolvedString:
857 case JVM_CONSTANT_Utf8:
858 // These constants are symbols, but unless these symbols are
859 // actually to be used for something, we don't want to mark them.
860 break;
862 case JVM_CONSTANT_Long:
863 case JVM_CONSTANT_Double:
864 // Do nothing! Not an oop. (But takes two pool entries.)
865 ++index;
866 break;
868 default:
869 ShouldNotReachHere();
870 break;
871 }
872 }
873 }
876 // Compare this constant pool's entry at index1 to the constant pool
877 // cp2's entry at index2.
878 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
879 int index2, TRAPS) {
881 jbyte t1 = tag_at(index1).value();
882 jbyte t2 = cp2->tag_at(index2).value();
885 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
886 // when comparing
887 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
888 t1 = JVM_CONSTANT_UnresolvedClass;
889 }
890 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
891 t2 = JVM_CONSTANT_UnresolvedClass;
892 }
894 if (t1 != t2) {
895 // Not the same entry type so there is nothing else to check. Note
896 // that this style of checking will consider resolved/unresolved
897 // class pairs and resolved/unresolved string pairs as different.
898 // From the constantPoolOop API point of view, this is correct
899 // behavior. See constantPoolKlass::merge() to see how this plays
900 // out in the context of constantPoolOop merging.
901 return false;
902 }
904 switch (t1) {
905 case JVM_CONSTANT_Class:
906 {
907 klassOop k1 = klass_at(index1, CHECK_false);
908 klassOop k2 = cp2->klass_at(index2, CHECK_false);
909 if (k1 == k2) {
910 return true;
911 }
912 } break;
914 case JVM_CONSTANT_ClassIndex:
915 {
916 int recur1 = klass_index_at(index1);
917 int recur2 = cp2->klass_index_at(index2);
918 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
919 if (match) {
920 return true;
921 }
922 } break;
924 case JVM_CONSTANT_Double:
925 {
926 jdouble d1 = double_at(index1);
927 jdouble d2 = cp2->double_at(index2);
928 if (d1 == d2) {
929 return true;
930 }
931 } break;
933 case JVM_CONSTANT_Fieldref:
934 case JVM_CONSTANT_InterfaceMethodref:
935 case JVM_CONSTANT_Methodref:
936 {
937 int recur1 = uncached_klass_ref_index_at(index1);
938 int recur2 = cp2->uncached_klass_ref_index_at(index2);
939 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
940 if (match) {
941 recur1 = uncached_name_and_type_ref_index_at(index1);
942 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
943 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
944 if (match) {
945 return true;
946 }
947 }
948 } break;
950 case JVM_CONSTANT_Float:
951 {
952 jfloat f1 = float_at(index1);
953 jfloat f2 = cp2->float_at(index2);
954 if (f1 == f2) {
955 return true;
956 }
957 } break;
959 case JVM_CONSTANT_Integer:
960 {
961 jint i1 = int_at(index1);
962 jint i2 = cp2->int_at(index2);
963 if (i1 == i2) {
964 return true;
965 }
966 } break;
968 case JVM_CONSTANT_Long:
969 {
970 jlong l1 = long_at(index1);
971 jlong l2 = cp2->long_at(index2);
972 if (l1 == l2) {
973 return true;
974 }
975 } break;
977 case JVM_CONSTANT_NameAndType:
978 {
979 int recur1 = name_ref_index_at(index1);
980 int recur2 = cp2->name_ref_index_at(index2);
981 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
982 if (match) {
983 recur1 = signature_ref_index_at(index1);
984 recur2 = cp2->signature_ref_index_at(index2);
985 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
986 if (match) {
987 return true;
988 }
989 }
990 } break;
992 case JVM_CONSTANT_String:
993 {
994 oop s1 = string_at(index1, CHECK_false);
995 oop s2 = cp2->string_at(index2, CHECK_false);
996 if (s1 == s2) {
997 return true;
998 }
999 } break;
1001 case JVM_CONSTANT_StringIndex:
1002 {
1003 int recur1 = string_index_at(index1);
1004 int recur2 = cp2->string_index_at(index2);
1005 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1006 if (match) {
1007 return true;
1008 }
1009 } break;
1011 case JVM_CONSTANT_UnresolvedClass:
1012 {
1013 Symbol* k1 = unresolved_klass_at(index1);
1014 Symbol* k2 = cp2->unresolved_klass_at(index2);
1015 if (k1 == k2) {
1016 return true;
1017 }
1018 } break;
1020 case JVM_CONSTANT_MethodType:
1021 {
1022 int k1 = method_type_index_at(index1);
1023 int k2 = cp2->method_type_index_at(index2);
1024 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1025 if (match) {
1026 return true;
1027 }
1028 } break;
1030 case JVM_CONSTANT_MethodHandle:
1031 {
1032 int k1 = method_handle_ref_kind_at(index1);
1033 int k2 = cp2->method_handle_ref_kind_at(index2);
1034 if (k1 == k2) {
1035 int i1 = method_handle_index_at(index1);
1036 int i2 = cp2->method_handle_index_at(index2);
1037 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1038 if (match) {
1039 return true;
1040 }
1041 }
1042 } break;
1044 case JVM_CONSTANT_InvokeDynamic:
1045 {
1046 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
1047 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
1048 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1049 if (!match) return false;
1050 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1051 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1052 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1053 if (!match) return false;
1054 int argc = invoke_dynamic_argument_count_at(index1);
1055 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
1056 for (int j = 0; j < argc; j++) {
1057 k1 = invoke_dynamic_argument_index_at(index1, j);
1058 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
1059 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1060 if (!match) return false;
1061 }
1062 return true; // got through loop; all elements equal
1063 }
1064 } break;
1066 case JVM_CONSTANT_UnresolvedString:
1067 {
1068 Symbol* s1 = unresolved_string_at(index1);
1069 Symbol* s2 = cp2->unresolved_string_at(index2);
1070 if (s1 == s2) {
1071 return true;
1072 }
1073 } break;
1075 case JVM_CONSTANT_Utf8:
1076 {
1077 Symbol* s1 = symbol_at(index1);
1078 Symbol* s2 = cp2->symbol_at(index2);
1079 if (s1 == s2) {
1080 return true;
1081 }
1082 } break;
1084 // Invalid is used as the tag for the second constant pool entry
1085 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1086 // not be seen by itself.
1087 case JVM_CONSTANT_Invalid: // fall through
1089 default:
1090 ShouldNotReachHere();
1091 break;
1092 }
1094 return false;
1095 } // end compare_entry_to()
1098 // Copy this constant pool's entries at start_i to end_i (inclusive)
1099 // to the constant pool to_cp's entries starting at to_i. A total of
1100 // (end_i - start_i) + 1 entries are copied.
1101 void constantPoolOopDesc::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1102 constantPoolHandle to_cp, int to_i, TRAPS) {
1104 int dest_i = to_i; // leave original alone for debug purposes
1106 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1107 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1109 switch (from_cp->tag_at(src_i).value()) {
1110 case JVM_CONSTANT_Double:
1111 case JVM_CONSTANT_Long:
1112 // double and long take two constant pool entries
1113 src_i += 2;
1114 dest_i += 2;
1115 break;
1117 default:
1118 // all others take one constant pool entry
1119 src_i++;
1120 dest_i++;
1121 break;
1122 }
1123 }
1125 int from_oplen = operand_array_length(from_cp->operands());
1126 int old_oplen = operand_array_length(to_cp->operands());
1127 if (from_oplen != 0) {
1128 // append my operands to the target's operands array
1129 if (old_oplen == 0) {
1130 to_cp->set_operands(from_cp->operands()); // reuse; do not merge
1131 } else {
1132 int old_len = to_cp->operands()->length();
1133 int from_len = from_cp->operands()->length();
1134 int old_off = old_oplen * sizeof(u2);
1135 int from_off = from_oplen * sizeof(u2);
1136 typeArrayHandle new_operands = oopFactory::new_permanent_shortArray(old_len + from_len, CHECK);
1137 int fillp = 0, len = 0;
1138 // first part of dest
1139 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1140 new_operands->short_at_addr(fillp),
1141 (len = old_off) * sizeof(u2));
1142 fillp += len;
1143 // first part of src
1144 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(0),
1145 new_operands->short_at_addr(fillp),
1146 (len = from_off) * sizeof(u2));
1147 fillp += len;
1148 // second part of dest
1149 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(old_off),
1150 new_operands->short_at_addr(fillp),
1151 (len = old_len - old_off) * sizeof(u2));
1152 fillp += len;
1153 // second part of src
1154 Copy::conjoint_memory_atomic(to_cp->operands()->short_at_addr(from_off),
1155 new_operands->short_at_addr(fillp),
1156 (len = from_len - from_off) * sizeof(u2));
1157 fillp += len;
1158 assert(fillp == new_operands->length(), "");
1160 // Adjust indexes in the first part of the copied operands array.
1161 for (int j = 0; j < from_oplen; j++) {
1162 int offset = operand_offset_at(new_operands(), old_oplen + j);
1163 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1164 offset += old_len; // every new tuple is preceded by old_len extra u2's
1165 operand_offset_at_put(new_operands(), old_oplen + j, offset);
1166 }
1168 // replace target operands array with combined array
1169 to_cp->set_operands(new_operands());
1170 }
1171 }
1173 } // end copy_cp_to()
1176 // Copy this constant pool's entry at from_i to the constant pool
1177 // to_cp's entry at to_i.
1178 void constantPoolOopDesc::copy_entry_to(constantPoolHandle from_cp, int from_i,
1179 constantPoolHandle to_cp, int to_i,
1180 TRAPS) {
1182 int tag = from_cp->tag_at(from_i).value();
1183 switch (tag) {
1184 case JVM_CONSTANT_Class:
1185 {
1186 klassOop k = from_cp->klass_at(from_i, CHECK);
1187 to_cp->klass_at_put(to_i, k);
1188 } break;
1190 case JVM_CONSTANT_ClassIndex:
1191 {
1192 jint ki = from_cp->klass_index_at(from_i);
1193 to_cp->klass_index_at_put(to_i, ki);
1194 } break;
1196 case JVM_CONSTANT_Double:
1197 {
1198 jdouble d = from_cp->double_at(from_i);
1199 to_cp->double_at_put(to_i, d);
1200 // double takes two constant pool entries so init second entry's tag
1201 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1202 } break;
1204 case JVM_CONSTANT_Fieldref:
1205 {
1206 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1207 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1208 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1209 } break;
1211 case JVM_CONSTANT_Float:
1212 {
1213 jfloat f = from_cp->float_at(from_i);
1214 to_cp->float_at_put(to_i, f);
1215 } break;
1217 case JVM_CONSTANT_Integer:
1218 {
1219 jint i = from_cp->int_at(from_i);
1220 to_cp->int_at_put(to_i, i);
1221 } break;
1223 case JVM_CONSTANT_InterfaceMethodref:
1224 {
1225 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1226 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1227 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1228 } break;
1230 case JVM_CONSTANT_Long:
1231 {
1232 jlong l = from_cp->long_at(from_i);
1233 to_cp->long_at_put(to_i, l);
1234 // long takes two constant pool entries so init second entry's tag
1235 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1236 } break;
1238 case JVM_CONSTANT_Methodref:
1239 {
1240 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1241 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1242 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1243 } break;
1245 case JVM_CONSTANT_NameAndType:
1246 {
1247 int name_ref_index = from_cp->name_ref_index_at(from_i);
1248 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1249 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1250 } break;
1252 case JVM_CONSTANT_String:
1253 {
1254 oop s = from_cp->string_at(from_i, CHECK);
1255 to_cp->string_at_put(to_i, s);
1256 } break;
1258 case JVM_CONSTANT_StringIndex:
1259 {
1260 jint si = from_cp->string_index_at(from_i);
1261 to_cp->string_index_at_put(to_i, si);
1262 } break;
1264 case JVM_CONSTANT_UnresolvedClass:
1265 {
1266 // Can be resolved after checking tag, so check the slot first.
1267 CPSlot entry = from_cp->slot_at(from_i);
1268 if (entry.is_oop()) {
1269 assert(entry.get_oop()->is_klass(), "must be");
1270 // Already resolved
1271 to_cp->klass_at_put(to_i, (klassOop)entry.get_oop());
1272 } else {
1273 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1274 }
1275 } break;
1277 case JVM_CONSTANT_UnresolvedClassInError:
1278 {
1279 Symbol* k = from_cp->unresolved_klass_at(from_i);
1280 to_cp->unresolved_klass_at_put(to_i, k);
1281 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1282 } break;
1285 case JVM_CONSTANT_UnresolvedString:
1286 {
1287 // Can be resolved after checking tag, so check the slot first.
1288 CPSlot entry = from_cp->slot_at(from_i);
1289 if (entry.is_oop()) {
1290 // Already resolved (either string or pseudo-string)
1291 to_cp->string_at_put(to_i, entry.get_oop());
1292 } else {
1293 to_cp->unresolved_string_at_put(to_i, entry.get_symbol());
1294 }
1295 } break;
1297 case JVM_CONSTANT_Utf8:
1298 {
1299 Symbol* s = from_cp->symbol_at(from_i);
1300 to_cp->symbol_at_put(to_i, s);
1301 // This constantPool has the same lifetime as the original, so don't
1302 // increase reference counts for the copy.
1303 } break;
1305 case JVM_CONSTANT_MethodType:
1306 {
1307 jint k = from_cp->method_type_index_at(from_i);
1308 to_cp->method_type_index_at_put(to_i, k);
1309 } break;
1311 case JVM_CONSTANT_MethodHandle:
1312 {
1313 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1314 int k2 = from_cp->method_handle_index_at(from_i);
1315 to_cp->method_handle_index_at_put(to_i, k1, k2);
1316 } break;
1318 case JVM_CONSTANT_InvokeDynamic:
1319 {
1320 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1321 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1322 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1323 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1324 } break;
1326 // Invalid is used as the tag for the second constant pool entry
1327 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1328 // not be seen by itself.
1329 case JVM_CONSTANT_Invalid: // fall through
1331 default:
1332 {
1333 ShouldNotReachHere();
1334 } break;
1335 }
1336 } // end copy_entry_to()
1339 // Search constant pool search_cp for an entry that matches this
1340 // constant pool's entry at pattern_i. Returns the index of a
1341 // matching entry or zero (0) if there is no matching entry.
1342 int constantPoolOopDesc::find_matching_entry(int pattern_i,
1343 constantPoolHandle search_cp, TRAPS) {
1345 // index zero (0) is not used
1346 for (int i = 1; i < search_cp->length(); i++) {
1347 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1348 if (found) {
1349 return i;
1350 }
1351 }
1353 return 0; // entry not found; return unused index zero (0)
1354 } // end find_matching_entry()
1357 #ifndef PRODUCT
1359 const char* constantPoolOopDesc::printable_name_at(int which) {
1361 constantTag tag = tag_at(which);
1363 if (tag.is_unresolved_string() || tag.is_string()) {
1364 return string_at_noresolve(which);
1365 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1366 return klass_name_at(which)->as_C_string();
1367 } else if (tag.is_symbol()) {
1368 return symbol_at(which)->as_C_string();
1369 }
1370 return "";
1371 }
1373 #endif // PRODUCT
1376 // JVMTI GetConstantPool support
1378 // For temporary use until code is stable.
1379 #define DBG(code)
1381 static const char* WARN_MSG = "Must not be such entry!";
1383 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1384 jint size = 0;
1385 u2 idx1, idx2;
1387 for (jint idx = 1; idx < cnt; idx++) {
1388 jint ent_size = 0;
1389 u1 tag = *bytes++;
1390 size++; // count tag
1392 printf("const #%03d, tag: %02d ", idx, tag);
1393 switch(tag) {
1394 case JVM_CONSTANT_Invalid: {
1395 printf("Invalid");
1396 break;
1397 }
1398 case JVM_CONSTANT_Unicode: {
1399 printf("Unicode %s", WARN_MSG);
1400 break;
1401 }
1402 case JVM_CONSTANT_Utf8: {
1403 u2 len = Bytes::get_Java_u2(bytes);
1404 char str[128];
1405 if (len > 127) {
1406 len = 127;
1407 }
1408 strncpy(str, (char *) (bytes+2), len);
1409 str[len] = '\0';
1410 printf("Utf8 \"%s\"", str);
1411 ent_size = 2 + len;
1412 break;
1413 }
1414 case JVM_CONSTANT_Integer: {
1415 u4 val = Bytes::get_Java_u4(bytes);
1416 printf("int %d", *(int *) &val);
1417 ent_size = 4;
1418 break;
1419 }
1420 case JVM_CONSTANT_Float: {
1421 u4 val = Bytes::get_Java_u4(bytes);
1422 printf("float %5.3ff", *(float *) &val);
1423 ent_size = 4;
1424 break;
1425 }
1426 case JVM_CONSTANT_Long: {
1427 u8 val = Bytes::get_Java_u8(bytes);
1428 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1429 ent_size = 8;
1430 idx++; // Long takes two cpool slots
1431 break;
1432 }
1433 case JVM_CONSTANT_Double: {
1434 u8 val = Bytes::get_Java_u8(bytes);
1435 printf("double %5.3fd", *(jdouble *)&val);
1436 ent_size = 8;
1437 idx++; // Double takes two cpool slots
1438 break;
1439 }
1440 case JVM_CONSTANT_Class: {
1441 idx1 = Bytes::get_Java_u2(bytes);
1442 printf("class #%03d", idx1);
1443 ent_size = 2;
1444 break;
1445 }
1446 case JVM_CONSTANT_String: {
1447 idx1 = Bytes::get_Java_u2(bytes);
1448 printf("String #%03d", idx1);
1449 ent_size = 2;
1450 break;
1451 }
1452 case JVM_CONSTANT_Fieldref: {
1453 idx1 = Bytes::get_Java_u2(bytes);
1454 idx2 = Bytes::get_Java_u2(bytes+2);
1455 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1456 ent_size = 4;
1457 break;
1458 }
1459 case JVM_CONSTANT_Methodref: {
1460 idx1 = Bytes::get_Java_u2(bytes);
1461 idx2 = Bytes::get_Java_u2(bytes+2);
1462 printf("Method #%03d, #%03d", idx1, idx2);
1463 ent_size = 4;
1464 break;
1465 }
1466 case JVM_CONSTANT_InterfaceMethodref: {
1467 idx1 = Bytes::get_Java_u2(bytes);
1468 idx2 = Bytes::get_Java_u2(bytes+2);
1469 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1470 ent_size = 4;
1471 break;
1472 }
1473 case JVM_CONSTANT_NameAndType: {
1474 idx1 = Bytes::get_Java_u2(bytes);
1475 idx2 = Bytes::get_Java_u2(bytes+2);
1476 printf("NameAndType #%03d, #%03d", idx1, idx2);
1477 ent_size = 4;
1478 break;
1479 }
1480 case JVM_CONSTANT_ClassIndex: {
1481 printf("ClassIndex %s", WARN_MSG);
1482 break;
1483 }
1484 case JVM_CONSTANT_UnresolvedClass: {
1485 printf("UnresolvedClass: %s", WARN_MSG);
1486 break;
1487 }
1488 case JVM_CONSTANT_UnresolvedClassInError: {
1489 printf("UnresolvedClassInErr: %s", WARN_MSG);
1490 break;
1491 }
1492 case JVM_CONSTANT_StringIndex: {
1493 printf("StringIndex: %s", WARN_MSG);
1494 break;
1495 }
1496 case JVM_CONSTANT_UnresolvedString: {
1497 printf("UnresolvedString: %s", WARN_MSG);
1498 break;
1499 }
1500 }
1501 printf(";\n");
1502 bytes += ent_size;
1503 size += ent_size;
1504 }
1505 printf("Cpool size: %d\n", size);
1506 fflush(0);
1507 return;
1508 } /* end print_cpool_bytes */
1511 // Returns size of constant pool entry.
1512 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
1513 switch(tag_at(idx).value()) {
1514 case JVM_CONSTANT_Invalid:
1515 case JVM_CONSTANT_Unicode:
1516 return 1;
1518 case JVM_CONSTANT_Utf8:
1519 return 3 + symbol_at(idx)->utf8_length();
1521 case JVM_CONSTANT_Class:
1522 case JVM_CONSTANT_String:
1523 case JVM_CONSTANT_ClassIndex:
1524 case JVM_CONSTANT_UnresolvedClass:
1525 case JVM_CONSTANT_UnresolvedClassInError:
1526 case JVM_CONSTANT_StringIndex:
1527 case JVM_CONSTANT_UnresolvedString:
1528 case JVM_CONSTANT_MethodType:
1529 return 3;
1531 case JVM_CONSTANT_MethodHandle:
1532 return 4; //tag, ref_kind, ref_index
1534 case JVM_CONSTANT_Integer:
1535 case JVM_CONSTANT_Float:
1536 case JVM_CONSTANT_Fieldref:
1537 case JVM_CONSTANT_Methodref:
1538 case JVM_CONSTANT_InterfaceMethodref:
1539 case JVM_CONSTANT_NameAndType:
1540 return 5;
1542 case JVM_CONSTANT_InvokeDynamic:
1543 // u1 tag, u2 bsm, u2 nt
1544 return 5;
1546 case JVM_CONSTANT_Long:
1547 case JVM_CONSTANT_Double:
1548 return 9;
1549 }
1550 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1551 return 1;
1552 } /* end cpool_entry_size */
1555 // SymbolHashMap is used to find a constant pool index from a string.
1556 // This function fills in SymbolHashMaps, one for utf8s and one for
1557 // class names, returns size of the cpool raw bytes.
1558 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
1559 SymbolHashMap *classmap) {
1560 jint size = 0;
1562 for (u2 idx = 1; idx < length(); idx++) {
1563 u2 tag = tag_at(idx).value();
1564 size += cpool_entry_size(idx);
1566 switch(tag) {
1567 case JVM_CONSTANT_Utf8: {
1568 Symbol* sym = symbol_at(idx);
1569 symmap->add_entry(sym, idx);
1570 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1571 break;
1572 }
1573 case JVM_CONSTANT_Class:
1574 case JVM_CONSTANT_UnresolvedClass:
1575 case JVM_CONSTANT_UnresolvedClassInError: {
1576 Symbol* sym = klass_name_at(idx);
1577 classmap->add_entry(sym, idx);
1578 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1579 break;
1580 }
1581 case JVM_CONSTANT_Long:
1582 case JVM_CONSTANT_Double: {
1583 idx++; // Both Long and Double take two cpool slots
1584 break;
1585 }
1586 }
1587 }
1588 return size;
1589 } /* end hash_utf8_entries_to */
1592 // Copy cpool bytes.
1593 // Returns:
1594 // 0, in case of OutOfMemoryError
1595 // -1, in case of internal error
1596 // > 0, count of the raw cpool bytes that have been copied
1597 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
1598 SymbolHashMap* tbl,
1599 unsigned char *bytes) {
1600 u2 idx1, idx2;
1601 jint size = 0;
1602 jint cnt = length();
1603 unsigned char *start_bytes = bytes;
1605 for (jint idx = 1; idx < cnt; idx++) {
1606 u1 tag = tag_at(idx).value();
1607 jint ent_size = cpool_entry_size(idx);
1609 assert(size + ent_size <= cpool_size, "Size mismatch");
1611 *bytes = tag;
1612 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1613 switch(tag) {
1614 case JVM_CONSTANT_Invalid: {
1615 DBG(printf("JVM_CONSTANT_Invalid"));
1616 break;
1617 }
1618 case JVM_CONSTANT_Unicode: {
1619 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1620 DBG(printf("JVM_CONSTANT_Unicode"));
1621 break;
1622 }
1623 case JVM_CONSTANT_Utf8: {
1624 Symbol* sym = symbol_at(idx);
1625 char* str = sym->as_utf8();
1626 // Warning! It's crashing on x86 with len = sym->utf8_length()
1627 int len = (int) strlen(str);
1628 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1629 for (int i = 0; i < len; i++) {
1630 bytes[3+i] = (u1) str[i];
1631 }
1632 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1633 break;
1634 }
1635 case JVM_CONSTANT_Integer: {
1636 jint val = int_at(idx);
1637 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1638 break;
1639 }
1640 case JVM_CONSTANT_Float: {
1641 jfloat val = float_at(idx);
1642 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1643 break;
1644 }
1645 case JVM_CONSTANT_Long: {
1646 jlong val = long_at(idx);
1647 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1648 idx++; // Long takes two cpool slots
1649 break;
1650 }
1651 case JVM_CONSTANT_Double: {
1652 jdouble val = double_at(idx);
1653 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1654 idx++; // Double takes two cpool slots
1655 break;
1656 }
1657 case JVM_CONSTANT_Class:
1658 case JVM_CONSTANT_UnresolvedClass:
1659 case JVM_CONSTANT_UnresolvedClassInError: {
1660 *bytes = JVM_CONSTANT_Class;
1661 Symbol* sym = klass_name_at(idx);
1662 idx1 = tbl->symbol_to_value(sym);
1663 assert(idx1 != 0, "Have not found a hashtable entry");
1664 Bytes::put_Java_u2((address) (bytes+1), idx1);
1665 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1666 break;
1667 }
1668 case JVM_CONSTANT_String: {
1669 unsigned int hash;
1670 char *str = string_at_noresolve(idx);
1671 TempNewSymbol sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
1672 if (sym == NULL) {
1673 // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
1674 // this can happen with JVM TI; see CR 6839599 for more details
1675 oop string = *(obj_at_addr_raw(idx));
1676 assert(java_lang_String::is_instance(string),"Not a String");
1677 DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
1678 idx1 = 0;
1679 for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
1680 for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
1681 int length;
1682 Symbol* s = cur->symbol();
1683 jchar* chars = s->as_unicode(length);
1684 if (java_lang_String::equals(string, chars, length)) {
1685 idx1 = cur->value();
1686 DBG(printf("Index found: %d\n",idx1));
1687 break;
1688 }
1689 }
1690 }
1691 } else {
1692 idx1 = tbl->symbol_to_value(sym);
1693 }
1694 assert(idx1 != 0, "Have not found a hashtable entry");
1695 Bytes::put_Java_u2((address) (bytes+1), idx1);
1696 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1697 break;
1698 }
1699 case JVM_CONSTANT_UnresolvedString: {
1700 *bytes = JVM_CONSTANT_String;
1701 Symbol* sym = unresolved_string_at(idx);
1702 idx1 = tbl->symbol_to_value(sym);
1703 assert(idx1 != 0, "Have not found a hashtable entry");
1704 Bytes::put_Java_u2((address) (bytes+1), idx1);
1705 DBG(char *str = sym->as_utf8());
1706 DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
1707 break;
1708 }
1709 case JVM_CONSTANT_Fieldref:
1710 case JVM_CONSTANT_Methodref:
1711 case JVM_CONSTANT_InterfaceMethodref: {
1712 idx1 = uncached_klass_ref_index_at(idx);
1713 idx2 = uncached_name_and_type_ref_index_at(idx);
1714 Bytes::put_Java_u2((address) (bytes+1), idx1);
1715 Bytes::put_Java_u2((address) (bytes+3), idx2);
1716 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1717 break;
1718 }
1719 case JVM_CONSTANT_NameAndType: {
1720 idx1 = name_ref_index_at(idx);
1721 idx2 = signature_ref_index_at(idx);
1722 Bytes::put_Java_u2((address) (bytes+1), idx1);
1723 Bytes::put_Java_u2((address) (bytes+3), idx2);
1724 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1725 break;
1726 }
1727 case JVM_CONSTANT_ClassIndex: {
1728 *bytes = JVM_CONSTANT_Class;
1729 idx1 = klass_index_at(idx);
1730 Bytes::put_Java_u2((address) (bytes+1), idx1);
1731 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1732 break;
1733 }
1734 case JVM_CONSTANT_StringIndex: {
1735 *bytes = JVM_CONSTANT_String;
1736 idx1 = string_index_at(idx);
1737 Bytes::put_Java_u2((address) (bytes+1), idx1);
1738 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1739 break;
1740 }
1741 case JVM_CONSTANT_MethodHandle: {
1742 *bytes = JVM_CONSTANT_MethodHandle;
1743 int kind = method_handle_ref_kind_at(idx);
1744 idx1 = method_handle_index_at(idx);
1745 *(bytes+1) = (unsigned char) kind;
1746 Bytes::put_Java_u2((address) (bytes+2), idx1);
1747 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1748 break;
1749 }
1750 case JVM_CONSTANT_MethodType: {
1751 *bytes = JVM_CONSTANT_MethodType;
1752 idx1 = method_type_index_at(idx);
1753 Bytes::put_Java_u2((address) (bytes+1), idx1);
1754 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1755 break;
1756 }
1757 case JVM_CONSTANT_InvokeDynamic: {
1758 *bytes = tag;
1759 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1760 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1761 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1762 Bytes::put_Java_u2((address) (bytes+1), idx1);
1763 Bytes::put_Java_u2((address) (bytes+3), idx2);
1764 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1765 break;
1766 }
1767 }
1768 DBG(printf("\n"));
1769 bytes += ent_size;
1770 size += ent_size;
1771 }
1772 assert(size == cpool_size, "Size mismatch");
1774 // Keep temorarily for debugging until it's stable.
1775 DBG(print_cpool_bytes(cnt, start_bytes));
1776 return (int)(bytes - start_bytes);
1777 } /* end copy_cpool_bytes */
1780 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
1781 char *str = sym->as_utf8();
1782 unsigned int hash = compute_hash(str, sym->utf8_length());
1783 unsigned int index = hash % table_size();
1785 // check if already in map
1786 // we prefer the first entry since it is more likely to be what was used in
1787 // the class file
1788 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1789 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1790 if (en->hash() == hash && en->symbol() == sym) {
1791 return; // already there
1792 }
1793 }
1795 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
1796 entry->set_next(bucket(index));
1797 _buckets[index].set_entry(entry);
1798 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1799 }
1801 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
1802 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
1803 char *str = sym->as_utf8();
1804 int len = sym->utf8_length();
1805 unsigned int hash = SymbolHashMap::compute_hash(str, len);
1806 unsigned int index = hash % table_size();
1807 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
1808 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
1809 if (en->hash() == hash && en->symbol() == sym) {
1810 return en;
1811 }
1812 }
1813 return NULL;
1814 }