1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc_implementation/shared/markSweep.inline.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "interpreter/rewriter.hpp"
29 #include "memory/universe.inline.hpp"
30 #include "oops/cpCache.hpp"
31 #include "oops/objArrayOop.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiRedefineClassesTrace.hpp"
34 #include "prims/methodHandles.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/orderAccess.inline.hpp"
37 #include "utilities/macros.hpp"
38 #if INCLUDE_ALL_GCS
39 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
40 #endif // INCLUDE_ALL_GCS
41
42 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
43
44 // Implementation of ConstantPoolCacheEntry
45
46 void ConstantPoolCacheEntry::initialize_entry(int index) {
47 assert(0 < index && index < 0x10000, "sanity check");
48 _indices = index;
49 _f1 = NULL;
50 _f2 = _flags = 0;
51 assert(constant_pool_index() == index, "");
52 }
53
54 int ConstantPoolCacheEntry::make_flags(TosState state,
55 int option_bits,
56 int field_index_or_method_params) {
57 assert(state < number_of_states, "Invalid state in make_flags");
58 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params;
59 // Preserve existing flag bit values
60 // The low bits are a field offset, or else the method parameter size.
61 #ifdef ASSERT
62 TosState old_state = flag_state();
63 assert(old_state == (TosState)0 || old_state == state,
64 "inconsistent cpCache flags state");
65 #endif
66 return (_flags | f) ;
67 }
68
69 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) {
70 #ifdef ASSERT
71 // Read once.
72 volatile Bytecodes::Code c = bytecode_1();
73 assert(c == 0 || c == code || code == 0, "update must be consistent");
74 #endif
75 // Need to flush pending stores here before bytecode is written.
76 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift));
77 }
78
79 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) {
80 #ifdef ASSERT
81 // Read once.
82 volatile Bytecodes::Code c = bytecode_2();
83 assert(c == 0 || c == code || code == 0, "update must be consistent");
84 #endif
85 // Need to flush pending stores here before bytecode is written.
86 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift));
87 }
88
89 // Sets f1, ordering with previous writes.
90 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) {
91 assert(f1 != NULL, "");
92 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1);
93 }
94
95 // Sets flags, but only if the value was previously zero.
96 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) {
97 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0);
98 return (result == 0);
99 }
100
101 // Note that concurrent update of both bytecodes can leave one of them
102 // reset to zero. This is harmless; the interpreter will simply re-resolve
103 // the damaged entry. More seriously, the memory synchronization is needed
104 // to flush other fields (f1, f2) completely to memory before the bytecodes
105 // are updated, lest other processors see a non-zero bytecode but zero f1/f2.
106 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code,
107 Bytecodes::Code put_code,
108 KlassHandle field_holder,
109 int field_index,
110 int field_offset,
111 TosState field_type,
112 bool is_final,
113 bool is_volatile,
114 Klass* root_klass) {
115 set_f1(field_holder());
116 set_f2(field_offset);
117 assert((field_index & field_index_mask) == field_index,
118 "field index does not fit in low flag bits");
119 set_field_flags(field_type,
120 ((is_volatile ? 1 : 0) << is_volatile_shift) |
121 ((is_final ? 1 : 0) << is_final_shift),
122 field_index);
123 set_bytecode_1(get_code);
124 set_bytecode_2(put_code);
125 NOT_PRODUCT(verify(tty));
126 }
127
128 void ConstantPoolCacheEntry::set_parameter_size(int value) {
129 // This routine is called only in corner cases where the CPCE is not yet initialized.
130 // See AbstractInterpreter::deopt_continue_after_entry.
131 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value,
132 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value));
133 // Setting the parameter size by itself is only safe if the
134 // current value of _flags is 0, otherwise another thread may have
135 // updated it and we don't want to overwrite that value. Don't
136 // bother trying to update it once it's nonzero but always make
137 // sure that the final parameter size agrees with what was passed.
138 if (_flags == 0) {
139 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0);
140 }
141 guarantee(parameter_size() == value,
142 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value));
143 }
144
145 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
146 methodHandle method,
147 int vtable_index) {
148 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
149 assert(method->interpreter_entry() != NULL, "should have been set at this point");
150 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
151
152 int byte_no = -1;
153 bool change_to_virtual = false;
154
155 switch (invoke_code) {
156 case Bytecodes::_invokeinterface:
157 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
158 // instruction somehow links to a non-interface method (in Object).
159 // In that case, the method has no itable index and must be invoked as a virtual.
160 // Set a flag to keep track of this corner case.
161 change_to_virtual = true;
162
163 // ...and fall through as if we were handling invokevirtual:
164 case Bytecodes::_invokevirtual:
165 {
166 if (!is_vtable_call) {
167 assert(method->can_be_statically_bound(), "");
168 // set_f2_as_vfinal_method checks if is_vfinal flag is true.
169 set_method_flags(as_TosState(method->result_type()),
170 ( 1 << is_vfinal_shift) |
171 ((method->is_final_method() ? 1 : 0) << is_final_shift) |
172 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
173 method()->size_of_parameters());
174 set_f2_as_vfinal_method(method());
175 } else {
176 assert(!method->can_be_statically_bound(), "");
177 assert(vtable_index >= 0, "valid index");
178 assert(!method->is_final_method(), "sanity");
179 set_method_flags(as_TosState(method->result_type()),
180 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
181 method()->size_of_parameters());
182 set_f2(vtable_index);
183 }
184 byte_no = 2;
185 break;
186 }
187
188 case Bytecodes::_invokespecial:
189 case Bytecodes::_invokestatic:
190 assert(!is_vtable_call, "");
191 // Note: Read and preserve the value of the is_vfinal flag on any
192 // invokevirtual bytecode shared with this constant pool cache entry.
193 // It is cheap and safe to consult is_vfinal() at all times.
194 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
195 set_method_flags(as_TosState(method->result_type()),
196 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) |
197 ((method->is_final_method() ? 1 : 0) << is_final_shift),
198 method()->size_of_parameters());
199 set_f1(method());
200 byte_no = 1;
201 break;
202 default:
203 ShouldNotReachHere();
204 break;
205 }
206
207 // Note: byte_no also appears in TemplateTable::resolve.
208 if (byte_no == 1) {
209 assert(invoke_code != Bytecodes::_invokevirtual &&
210 invoke_code != Bytecodes::_invokeinterface, "");
211 set_bytecode_1(invoke_code);
212 } else if (byte_no == 2) {
213 if (change_to_virtual) {
214 assert(invoke_code == Bytecodes::_invokeinterface, "");
215 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
216 //
217 // Workaround for the case where we encounter an invokeinterface, but we
218 // should really have an _invokevirtual since the resolved method is a
219 // virtual method in java.lang.Object. This is a corner case in the spec
220 // but is presumably legal. javac does not generate this code.
221 //
222 // We set bytecode_1() to _invokeinterface, because that is the
223 // bytecode # used by the interpreter to see if it is resolved.
224 // We set bytecode_2() to _invokevirtual.
225 // See also interpreterRuntime.cpp. (8/25/2000)
226 // Only set resolved for the invokeinterface case if method is public.
227 // Otherwise, the method needs to be reresolved with caller for each
228 // interface call.
229 if (method->is_public()) set_bytecode_1(invoke_code);
230 } else {
231 assert(invoke_code == Bytecodes::_invokevirtual, "");
232 }
233 // set up for invokevirtual, even if linking for invokeinterface also:
234 set_bytecode_2(Bytecodes::_invokevirtual);
235 } else {
236 ShouldNotReachHere();
237 }
238 NOT_PRODUCT(verify(tty));
239 }
240
241 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, methodHandle method) {
242 int index = Method::nonvirtual_vtable_index;
243 // index < 0; FIXME: inline and customize set_direct_or_vtable_call
244 set_direct_or_vtable_call(invoke_code, method, index);
245 }
246
247 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, methodHandle method, int index) {
248 // either the method is a miranda or its holder should accept the given index
249 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
250 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
251 set_direct_or_vtable_call(invoke_code, method, index);
252 }
253
254 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, methodHandle method, int index) {
255 assert(method->method_holder()->verify_itable_index(index), "");
256 assert(invoke_code == Bytecodes::_invokeinterface, "");
257 InstanceKlass* interf = method->method_holder();
258 assert(interf->is_interface(), "must be an interface");
259 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
260 set_f1(interf);
261 set_f2(index);
262 set_method_flags(as_TosState(method->result_type()),
263 0, // no option bits
264 method()->size_of_parameters());
265 set_bytecode_1(Bytecodes::_invokeinterface);
266 }
267
268
269 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) {
270 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info);
271 }
272
273 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) {
274 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info);
275 }
276
277 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool,
278 Bytecodes::Code invoke_code,
279 const CallInfo &call_info) {
280 // NOTE: This CPCE can be the subject of data races.
281 // There are three words to update: flags, refs[f2], f1 (in that order).
282 // Writers must store all other values before f1.
283 // Readers must test f1 first for non-null before reading other fields.
284 // Competing writers must acquire exclusive access via a lock.
285 // A losing writer waits on the lock until the winner writes f1 and leaves
286 // the lock, so that when the losing writer returns, he can use the linked
287 // cache entry.
288
289 MonitorLockerEx ml(cpool->lock());
290 if (!is_f1_null()) {
291 return;
292 }
293
294 const methodHandle adapter = call_info.resolved_method();
295 const Handle appendix = call_info.resolved_appendix();
296 const Handle method_type = call_info.resolved_method_type();
297 const bool has_appendix = appendix.not_null();
298 const bool has_method_type = method_type.not_null();
299
300 // Write the flags.
301 set_method_flags(as_TosState(adapter->result_type()),
302 ((has_appendix ? 1 : 0) << has_appendix_shift ) |
303 ((has_method_type ? 1 : 0) << has_method_type_shift) |
304 ( 1 << is_final_shift ),
305 adapter->size_of_parameters());
306
307 if (TraceInvokeDynamic) {
308 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ",
309 invoke_code,
310 (void *)appendix(), (has_appendix ? "" : " (unused)"),
311 (void *)method_type(), (has_method_type ? "" : " (unused)"),
312 (intptr_t)adapter());
313 adapter->print();
314 if (has_appendix) appendix()->print();
315 }
316
317 // Method handle invokes and invokedynamic sites use both cp cache words.
318 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter.
319 // In the general case, this could be the call site's MethodType,
320 // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
321 // f1 contains the adapter method which manages the actual call.
322 // In the general case, this is a compiled LambdaForm.
323 // (The Java code is free to optimize these calls by binding other
324 // sorts of methods and appendices to call sites.)
325 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased.
326 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
327 // Even with the appendix, the method will never take more than 255 parameter slots.
328 //
329 // This means that given a call site like (List)mh.invoke("foo"),
330 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
331 // not '(Ljava/lang/String;)Ljava/util/List;'.
332 // The fact that String and List are involved is encoded in the MethodType in refs[f2].
333 // This allows us to create fewer Methods, while keeping type safety.
334 //
335
336 objArrayHandle resolved_references = cpool->resolved_references();
337 // Store appendix, if any.
338 if (has_appendix) {
339 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset;
340 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
341 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once");
342 resolved_references->obj_at_put(appendix_index, appendix());
343 }
344
345 // Store MethodType, if any.
346 if (has_method_type) {
347 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset;
348 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob");
349 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once");
350 resolved_references->obj_at_put(method_type_index, method_type());
351 }
352
353 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)!
354
355 // The interpreter assembly code does not check byte_2,
356 // but it is used by is_resolved, method_if_resolved, etc.
357 set_bytecode_1(invoke_code);
358 NOT_PRODUCT(verify(tty));
359 if (TraceInvokeDynamic) {
360 this->print(tty, 0);
361 }
362 }
363
364 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) {
365 // Decode the action of set_method and set_interface_call
366 Bytecodes::Code invoke_code = bytecode_1();
367 if (invoke_code != (Bytecodes::Code)0) {
368 Metadata* f1 = f1_ord();
369 if (f1 != NULL) {
370 switch (invoke_code) {
371 case Bytecodes::_invokeinterface:
372 assert(f1->is_klass(), "");
373 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index());
374 case Bytecodes::_invokestatic:
375 case Bytecodes::_invokespecial:
376 assert(!has_appendix(), "");
377 case Bytecodes::_invokehandle:
378 case Bytecodes::_invokedynamic:
379 assert(f1->is_method(), "");
380 return (Method*)f1;
381 }
382 }
383 }
384 invoke_code = bytecode_2();
385 if (invoke_code != (Bytecodes::Code)0) {
386 switch (invoke_code) {
387 case Bytecodes::_invokevirtual:
388 if (is_vfinal()) {
389 // invokevirtual
390 Method* m = f2_as_vfinal_method();
391 assert(m->is_method(), "");
392 return m;
393 } else {
394 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
395 if (cpool->tag_at(holder_index).is_klass()) {
396 Klass* klass = cpool->resolved_klass_at(holder_index);
397 if (!klass->oop_is_instance())
398 klass = SystemDictionary::Object_klass();
399 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index());
400 }
401 }
402 break;
403 }
404 }
405 return NULL;
406 }
407
408
409 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) {
410 if (is_f1_null() || !has_appendix())
411 return NULL;
412 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset;
413 objArrayOop resolved_references = cpool->resolved_references();
414 return resolved_references->obj_at(ref_index);
415 }
416
417
418 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) {
419 if (is_f1_null() || !has_method_type())
420 return NULL;
421 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset;
422 objArrayOop resolved_references = cpool->resolved_references();
423 return resolved_references->obj_at(ref_index);
424 }
425
426
427 #if INCLUDE_JVMTI
428 // RedefineClasses() API support:
429 // If this ConstantPoolCacheEntry refers to old_method then update it
430 // to refer to new_method.
431 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method,
432 Method* new_method, bool * trace_name_printed) {
433
434 if (is_vfinal()) {
435 // virtual and final so _f2 contains method ptr instead of vtable index
436 if (f2_as_vfinal_method() == old_method) {
437 // match old_method so need an update
438 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
439 _f2 = (intptr_t)new_method;
440 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
441 if (!(*trace_name_printed)) {
442 // RC_TRACE_MESG macro has an embedded ResourceMark
443 RC_TRACE_MESG(("adjust: name=%s",
444 old_method->method_holder()->external_name()));
445 *trace_name_printed = true;
446 }
447 // RC_TRACE macro has an embedded ResourceMark
448 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)",
449 new_method->name()->as_C_string(),
450 new_method->signature()->as_C_string()));
451 }
452
453 return true;
454 }
455
456 // f1() is not used with virtual entries so bail out
457 return false;
458 }
459
460 if (_f1 == NULL) {
461 // NULL f1() means this is a virtual entry so bail out
462 // We are assuming that the vtable index does not need change.
463 return false;
464 }
465
466 if (_f1 == old_method) {
467 _f1 = new_method;
468 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
469 if (!(*trace_name_printed)) {
470 // RC_TRACE_MESG macro has an embedded ResourceMark
471 RC_TRACE_MESG(("adjust: name=%s",
472 old_method->method_holder()->external_name()));
473 *trace_name_printed = true;
474 }
475 // RC_TRACE macro has an embedded ResourceMark
476 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)",
477 new_method->name()->as_C_string(),
478 new_method->signature()->as_C_string()));
479 }
480
481 return true;
482 }
483
484 return false;
485 }
486
487 // a constant pool cache entry should never contain old or obsolete methods
488 bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() {
489 if (is_vfinal()) {
490 // virtual and final so _f2 contains method ptr instead of vtable index
491 Metadata* f2 = (Metadata*)_f2;
492 // Return false if _f2 refers to an old or an obsolete method.
493 // _f2 == NULL || !_f2->is_method() are just as unexpected here.
494 return (f2 != NULL NOT_PRODUCT(&& f2->is_valid()) && f2->is_method() &&
495 !((Method*)f2)->is_old() && !((Method*)f2)->is_obsolete());
496 } else if (_f1 == NULL ||
497 (NOT_PRODUCT(_f1->is_valid() &&) !_f1->is_method())) {
498 // _f1 == NULL || !_f1->is_method() are OK here
499 return true;
500 }
501 // return false if _f1 refers to a non-deleted old or obsolete method
502 return (NOT_PRODUCT(_f1->is_valid() &&) _f1->is_method() &&
503 (f1_as_method()->is_deleted() ||
504 (!f1_as_method()->is_old() && !f1_as_method()->is_obsolete())));
505 }
506
507 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) {
508 if (!is_method_entry()) {
509 // not a method entry so not interesting by default
510 return false;
511 }
512
513 Method* m = NULL;
514 if (is_vfinal()) {
515 // virtual and final so _f2 contains method ptr instead of vtable index
516 m = f2_as_vfinal_method();
517 } else if (is_f1_null()) {
518 // NULL _f1 means this is a virtual entry so also not interesting
519 return false;
520 } else {
521 if (!(_f1->is_method())) {
522 // _f1 can also contain a Klass* for an interface
523 return false;
524 }
525 m = f1_as_method();
526 }
527
528 assert(m != NULL && m->is_method(), "sanity check");
529 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) {
530 // robustness for above sanity checks or method is not in
531 // the interesting class
532 return false;
533 }
534
535 // the method is in the interesting class so the entry is interesting
536 return true;
537 }
538 #endif // INCLUDE_JVMTI
539
540 void ConstantPoolCacheEntry::print(outputStream* st, int index) const {
541 // print separator
542 if (index == 0) st->print_cr(" -------------");
543 // print entry
544 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this);
545 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(),
546 constant_pool_index());
547 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1);
548 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2);
549 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags);
550 st->print_cr(" -------------");
551 }
552
553 void ConstantPoolCacheEntry::verify(outputStream* st) const {
554 // not implemented yet
555 }
556
557 // Implementation of ConstantPoolCache
558
559 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
560 const intStack& index_map,
561 const intStack& invokedynamic_index_map,
562 const intStack& invokedynamic_map, TRAPS) {
563
564 const int length = index_map.length() + invokedynamic_index_map.length();
565 int size = ConstantPoolCache::size(length);
566
567 return new (loader_data, size, false, MetaspaceObj::ConstantPoolCacheType, THREAD)
568 ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map);
569 }
570
571 void ConstantPoolCache::initialize(const intArray& inverse_index_map,
572 const intArray& invokedynamic_inverse_index_map,
573 const intArray& invokedynamic_references_map) {
574 for (int i = 0; i < inverse_index_map.length(); i++) {
575 ConstantPoolCacheEntry* e = entry_at(i);
576 int original_index = inverse_index_map[i];
577 e->initialize_entry(original_index);
578 assert(entry_at(i) == e, "sanity");
579 }
580
581 // Append invokedynamic entries at the end
582 int invokedynamic_offset = inverse_index_map.length();
583 for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) {
584 int offset = i + invokedynamic_offset;
585 ConstantPoolCacheEntry* e = entry_at(offset);
586 int original_index = invokedynamic_inverse_index_map[i];
587 e->initialize_entry(original_index);
588 assert(entry_at(offset) == e, "sanity");
589 }
590
591 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) {
592 const int cpci = invokedynamic_references_map[ref];
593 if (cpci >= 0) {
594 #ifdef ASSERT
595 // invokedynamic and invokehandle have more entries; check if they
596 // all point to the same constant pool cache entry.
597 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) {
598 const int cpci_next = invokedynamic_references_map[ref + entry];
599 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next));
600 }
601 #endif
602 entry_at(cpci)->initialize_resolved_reference_index(ref);
603 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries
604 }
605 }
606 }
607
608 #if INCLUDE_JVMTI
609 // RedefineClasses() API support:
610 // If any entry of this ConstantPoolCache points to any of
611 // old_methods, replace it with the corresponding new_method.
612 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods,
613 int methods_length, bool * trace_name_printed) {
614
615 if (methods_length == 0) {
616 // nothing to do if there are no methods
617 return;
618 }
619
620 // get shorthand for the interesting class
621 Klass* old_holder = old_methods[0]->method_holder();
622
623 for (int i = 0; i < length(); i++) {
624 if (!entry_at(i)->is_interesting_method_entry(old_holder)) {
625 // skip uninteresting methods
626 continue;
627 }
628
629 // The ConstantPoolCache contains entries for several different
630 // things, but we only care about methods. In fact, we only care
631 // about methods in the same class as the one that contains the
632 // old_methods. At this point, we have an interesting entry.
633
634 for (int j = 0; j < methods_length; j++) {
635 Method* old_method = old_methods[j];
636 Method* new_method = new_methods[j];
637
638 if (entry_at(i)->adjust_method_entry(old_method, new_method,
639 trace_name_printed)) {
640 // current old_method matched this entry and we updated it so
641 // break out and get to the next interesting entry if there one
642 break;
643 }
644 }
645 }
646 }
647
648 // the constant pool cache should never contain old or obsolete methods
649 bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
650 for (int i = 1; i < length(); i++) {
651 if (entry_at(i)->is_interesting_method_entry(NULL) &&
652 !entry_at(i)->check_no_old_or_obsolete_entries()) {
653 return false;
654 }
655 }
656 return true;
657 }
658
659 void ConstantPoolCache::dump_cache() {
660 for (int i = 1; i < length(); i++) {
661 if (entry_at(i)->is_interesting_method_entry(NULL)) {
662 entry_at(i)->print(tty, i);
663 }
664 }
665 }
666 #endif // INCLUDE_JVMTI
667
668
669 // Printing
670
671 void ConstantPoolCache::print_on(outputStream* st) const {
672 assert(is_constantPoolCache(), "obj must be constant pool cache");
673 st->print_cr("%s", internal_name());
674 // print constant pool cache entries
675 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i);
676 }
677
678 void ConstantPoolCache::print_value_on(outputStream* st) const {
679 assert(is_constantPoolCache(), "obj must be constant pool cache");
680 st->print("cache [%d]", length());
681 print_address_on(st);
682 st->print(" for ");
683 constant_pool()->print_value_on(st);
684 }
685
686
687 // Verification
688
689 void ConstantPoolCache::verify_on(outputStream* st) {
690 guarantee(is_constantPoolCache(), "obj must be constant pool cache");
691 // print constant pool cache entries
692 for (int i = 0; i < length(); i++) entry_at(i)->verify(st);
693 }