1 /*
2 * Copyright (c) 1997, 2018, 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 "classfile/systemDictionary.hpp"
27 #include "code/codeBehaviours.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/nmethod.hpp"
32 #include "code/vtableStubs.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/metadataFactory.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/method.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/symbol.hpp"
41 #include "runtime/handles.inline.hpp"
42 #include "runtime/icache.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/stubRoutines.hpp"
45 #include "utilities/events.hpp"
46
47
48 // Every time a compiled IC is changed or its type is being accessed,
49 // either the CompiledIC_lock must be set or we must be at a safe point.
50
51 CompiledICLocker::CompiledICLocker(CompiledMethod* method)
52 : _method(method),
53 _behaviour(CompiledICProtectionBehaviour::current()),
54 _locked(_behaviour->lock(_method)){
55 }
56
57 CompiledICLocker::~CompiledICLocker() {
58 if (_locked) {
59 _behaviour->unlock(_method);
60 }
61 }
62
63 bool CompiledICLocker::is_safe(CompiledMethod* method) {
64 return CompiledICProtectionBehaviour::current()->is_safe(method);
65 }
66
67 bool CompiledICLocker::is_safe(address code) {
68 CodeBlob* cb = CodeCache::find_blob_unsafe(code);
69 assert(cb != NULL && cb->is_compiled(), "must be compiled");
70 CompiledMethod* cm = cb->as_compiled_method();
71 return CompiledICProtectionBehaviour::current()->is_safe(cm);
72 }
73
74 //-----------------------------------------------------------------------------
75 // Low-level access to an inline cache. Private, since they might not be
76 // MT-safe to use.
77
78 void* CompiledIC::cached_value() const {
79 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
80 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
81
82 if (!is_in_transition_state()) {
83 void* data = get_data();
84 // If we let the metadata value here be initialized to zero...
85 assert(data != NULL || Universe::non_oop_word() == NULL,
86 "no raw nulls in CompiledIC metadatas, because of patching races");
87 return (data == (void*)Universe::non_oop_word()) ? NULL : data;
88 } else {
89 return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
90 }
91 }
92
93
94 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
95 assert(entry_point != NULL, "must set legal entry point");
96 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
97 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
98 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
99
100 assert(!is_icholder || is_icholder_entry(entry_point), "must be");
101
102 // Don't use ic_destination for this test since that forwards
103 // through ICBuffer instead of returning the actual current state of
104 // the CompiledIC.
105 if (is_icholder_entry(_call->destination())) {
106 // When patching for the ICStub case the cached value isn't
107 // overwritten until the ICStub copied into the CompiledIC during
108 // the next safepoint. Make sure that the CompiledICHolder* is
109 // marked for release at this point since it won't be identifiable
110 // once the entry point is overwritten.
111 InlineCacheBuffer::queue_for_release((CompiledICHolder*)get_data());
112 }
113
114 if (TraceCompiledIC) {
115 tty->print(" ");
116 print_compiled_ic();
117 tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point));
118 if (!is_optimized()) {
119 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache));
120 }
121 if (is_icstub) {
122 tty->print(" (icstub)");
123 }
124 tty->cr();
125 }
126
127 {
128 CodeBlob* cb = CodeCache::find_blob_unsafe(_call->instruction_address());
129 MutexLockerEx pl(CompiledICLocker::is_safe(cb->as_compiled_method()) ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
130 assert(cb != NULL && cb->is_compiled(), "must be compiled");
131 _call->set_destination_mt_safe(entry_point);
132 }
133
134 if (is_optimized() || is_icstub) {
135 // Optimized call sites don't have a cache value and ICStub call
136 // sites only change the entry point. Changing the value in that
137 // case could lead to MT safety issues.
138 assert(cache == NULL, "must be null");
139 return;
140 }
141
142 if (cache == NULL) cache = (void*)Universe::non_oop_word();
143
144 set_data((intptr_t)cache);
145 }
146
147
148 void CompiledIC::set_ic_destination(ICStub* stub) {
149 internal_set_ic_destination(stub->code_begin(), true, NULL, false);
150 }
151
152
153
154 address CompiledIC::ic_destination() const {
155 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
156 if (!is_in_transition_state()) {
157 return _call->destination();
158 } else {
159 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
160 }
161 }
162
163
164 bool CompiledIC::is_in_transition_state() const {
165 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
166 return InlineCacheBuffer::contains(_call->destination());;
167 }
168
169
170 bool CompiledIC::is_icholder_call() const {
171 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
172 return !_is_optimized && is_icholder_entry(ic_destination());
173 }
174
175 // Returns native address of 'call' instruction in inline-cache. Used by
176 // the InlineCacheBuffer when it needs to find the stub.
177 address CompiledIC::stub_address() const {
178 assert(is_in_transition_state(), "should only be called when we are in a transition state");
179 return _call->destination();
180 }
181
182 // Clears the IC stub if the compiled IC is in transition state
183 void CompiledIC::clear_ic_stub() {
184 if (is_in_transition_state()) {
185 ICStub* stub = ICStub_from_destination_address(stub_address());
186 stub->clear();
187 }
188 }
189
190 //-----------------------------------------------------------------------------
191 // High-level access to an inline cache. Guaranteed to be MT-safe.
192
193 void CompiledIC::initialize_from_iter(RelocIterator* iter) {
194 assert(iter->addr() == _call->instruction_address(), "must find ic_call");
195
196 if (iter->type() == relocInfo::virtual_call_type) {
197 virtual_call_Relocation* r = iter->virtual_call_reloc();
198 _is_optimized = false;
199 _value = _call->get_load_instruction(r);
200 } else {
201 assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
202 _is_optimized = true;
203 _value = NULL;
204 }
205 }
206
207 CompiledIC::CompiledIC(CompiledMethod* cm, NativeCall* call)
208 : _method(cm)
209 {
210 _call = _method->call_wrapper_at((address) call);
211 address ic_call = _call->instruction_address();
212
213 assert(ic_call != NULL, "ic_call address must be set");
214 assert(cm != NULL, "must pass compiled method");
215 assert(cm->contains(ic_call), "must be in compiled method");
216
217 // Search for the ic_call at the given address.
218 RelocIterator iter(cm, ic_call, ic_call+1);
219 bool ret = iter.next();
220 assert(ret == true, "relocInfo must exist at this address");
221 assert(iter.addr() == ic_call, "must find ic_call");
222
223 initialize_from_iter(&iter);
224 }
225
226 CompiledIC::CompiledIC(RelocIterator* iter)
227 : _method(iter->code())
228 {
229 _call = _method->call_wrapper_at(iter->addr());
230 address ic_call = _call->instruction_address();
231
232 CompiledMethod* nm = iter->code();
233 assert(ic_call != NULL, "ic_call address must be set");
234 assert(nm != NULL, "must pass compiled method");
235 assert(nm->contains(ic_call), "must be in compiled method");
236
237 initialize_from_iter(iter);
238 }
239
240 // This function may fail for two reasons: either due to running out of vtable
241 // stubs, or due to running out of IC stubs in an attempted transition to a
242 // transitional state. The needs_ic_stub_refill value will be set if the failure
243 // was due to running out of IC stubs, in which case the caller will refill IC
244 // stubs and retry.
245 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode,
246 bool& needs_ic_stub_refill, TRAPS) {
247 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
248 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
249 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
250
251 address entry;
252 if (call_info->call_kind() == CallInfo::itable_call) {
253 assert(bytecode == Bytecodes::_invokeinterface, "");
254 int itable_index = call_info->itable_index();
255 entry = VtableStubs::find_itable_stub(itable_index);
256 if (entry == NULL) {
257 return false;
258 }
259 #ifdef ASSERT
260 int index = call_info->resolved_method()->itable_index();
261 assert(index == itable_index, "CallInfo pre-computes this");
262 InstanceKlass* k = call_info->resolved_method()->method_holder();
263 assert(k->verify_itable_index(itable_index), "sanity check");
264 #endif //ASSERT
265 CompiledICHolder* holder = new CompiledICHolder(call_info->resolved_method()->method_holder(),
266 call_info->resolved_klass(), false);
267 holder->claim();
268 if (!InlineCacheBuffer::create_transition_stub(this, holder, entry)) {
269 delete holder;
270 needs_ic_stub_refill = true;
271 return false;
272 }
273 } else {
274 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
275 // Can be different than selected_method->vtable_index(), due to package-private etc.
276 int vtable_index = call_info->vtable_index();
277 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
278 entry = VtableStubs::find_vtable_stub(vtable_index);
279 if (entry == NULL) {
280 return false;
281 }
282 if (!InlineCacheBuffer::create_transition_stub(this, NULL, entry)) {
283 needs_ic_stub_refill = true;
284 return false;
285 }
286 }
287
288 if (TraceICs) {
289 ResourceMark rm;
290 assert(!call_info->selected_method().is_null(), "Unexpected null selected method");
291 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
292 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
293 }
294
295 // We can't check this anymore. With lazy deopt we could have already
296 // cleaned this IC entry before we even return. This is possible if
297 // we ran out of space in the inline cache buffer trying to do the
298 // set_next and we safepointed to free up space. This is a benign
299 // race because the IC entry was complete when we safepointed so
300 // cleaning it immediately is harmless.
301 // assert(is_megamorphic(), "sanity check");
302 return true;
303 }
304
305
306 // true if destination is megamorphic stub
307 bool CompiledIC::is_megamorphic() const {
308 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
309 assert(!is_optimized(), "an optimized call cannot be megamorphic");
310
311 // Cannot rely on cached_value. It is either an interface or a method.
312 return VtableStubs::entry_point(ic_destination()) != NULL;
313 }
314
315 bool CompiledIC::is_call_to_compiled() const {
316 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
317
318 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
319 // method is guaranteed to still exist, since we only remove methods after all inline caches
320 // has been cleaned up
321 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
322 bool is_monomorphic = (cb != NULL && cb->is_compiled());
323 // Check that the cached_value is a klass for non-optimized monomorphic calls
324 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
325 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL).
326 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized
327 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites.
328 #ifdef ASSERT
329 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
330 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci();
331 assert( is_c1_or_jvmci_method ||
332 !is_monomorphic ||
333 is_optimized() ||
334 !caller->is_alive() ||
335 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
336 #endif // ASSERT
337 return is_monomorphic;
338 }
339
340
341 bool CompiledIC::is_call_to_interpreted() const {
342 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
343 // Call to interpreter if destination is either calling to a stub (if it
344 // is optimized), or calling to an I2C blob
345 bool is_call_to_interpreted = false;
346 if (!is_optimized()) {
347 // must use unsafe because the destination can be a zombie (and we're cleaning)
348 // and the print_compiled_ic code wants to know if site (in the non-zombie)
349 // is to the interpreter.
350 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
351 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
352 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
353 } else {
354 // Check if we are calling into our own codeblob (i.e., to a stub)
355 address dest = ic_destination();
356 #ifdef ASSERT
357 {
358 _call->verify_resolve_call(dest);
359 }
360 #endif /* ASSERT */
361 is_call_to_interpreted = _call->is_call_to_interpreted(dest);
362 }
363 return is_call_to_interpreted;
364 }
365
366 bool CompiledIC::set_to_clean(bool in_use) {
367 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
368 if (TraceInlineCacheClearing || TraceICs) {
369 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
370 print();
371 }
372
373 address entry = _call->get_resolve_call_stub(is_optimized());
374
375 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
376 // we only need to patch the destination
377 bool safe_transition = _call->is_safe_for_patching() || !in_use || is_optimized() || CompiledICLocker::is_safe(_method);
378
379 if (safe_transition) {
380 // Kill any leftover stub we might have too
381 clear_ic_stub();
382 if (is_optimized()) {
383 set_ic_destination(entry);
384 } else {
385 set_ic_destination_and_value(entry, (void*)NULL);
386 }
387 } else {
388 // Unsafe transition - create stub.
389 if (!InlineCacheBuffer::create_transition_stub(this, NULL, entry)) {
390 return false;
391 }
392 }
393 // We can't check this anymore. With lazy deopt we could have already
394 // cleaned this IC entry before we even return. This is possible if
395 // we ran out of space in the inline cache buffer trying to do the
396 // set_next and we safepointed to free up space. This is a benign
397 // race because the IC entry was complete when we safepointed so
398 // cleaning it immediately is harmless.
399 // assert(is_clean(), "sanity check");
400 return true;
401 }
402
403 bool CompiledIC::is_clean() const {
404 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
405 bool is_clean = false;
406 address dest = ic_destination();
407 is_clean = dest == _call->get_resolve_call_stub(is_optimized());
408 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
409 return is_clean;
410 }
411
412 bool CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
413 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
414 // Updating a cache to the wrong entry can cause bugs that are very hard
415 // to track down - if cache entry gets invalid - we just clean it. In
416 // this way it is always the same code path that is responsible for
417 // updating and resolving an inline cache
418 //
419 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
420 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
421 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
422 //
423 // In both of these cases the only thing being modifed is the jump/call target and these
424 // transitions are mt_safe
425
426 Thread *thread = Thread::current();
427 if (info.to_interpreter() || info.to_aot()) {
428 // Call to interpreter
429 if (info.is_optimized() && is_optimized()) {
430 assert(is_clean(), "unsafe IC path");
431 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
432 // the call analysis (callee structure) specifies that the call is optimized
433 // (either because of CHA or the static target is final)
434 // At code generation time, this call has been emitted as static call
435 // Call via stub
436 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
437 methodHandle method (thread, (Method*)info.cached_metadata());
438 _call->set_to_interpreted(method, info);
439
440 if (TraceICs) {
441 ResourceMark rm(thread);
442 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to %s: %s",
443 p2i(instruction_address()),
444 (info.to_aot() ? "aot" : "interpreter"),
445 method->print_value_string());
446 }
447 } else {
448 // Call via method-klass-holder
449 CompiledICHolder* holder = info.claim_cached_icholder();
450 if (!InlineCacheBuffer::create_transition_stub(this, holder, info.entry())) {
451 delete holder;
452 return false;
453 }
454 if (TraceICs) {
455 ResourceMark rm(thread);
456 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
457 }
458 }
459 } else {
460 // Call to compiled code
461 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
462 #ifdef ASSERT
463 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
464 assert (cb != NULL && cb->is_compiled(), "must be compiled!");
465 #endif /* ASSERT */
466
467 // This is MT safe if we come from a clean-cache and go through a
468 // non-verified entry point
469 bool safe = SafepointSynchronize::is_at_safepoint() ||
470 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
471
472 if (!safe) {
473 if (!InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry())) {
474 return false;
475 }
476 } else {
477 if (is_optimized()) {
478 set_ic_destination(info.entry());
479 } else {
480 set_ic_destination_and_value(info.entry(), info.cached_metadata());
481 }
482 }
483
484 if (TraceICs) {
485 ResourceMark rm(thread);
486 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
487 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
488 p2i(instruction_address()),
489 ((Klass*)info.cached_metadata())->print_value_string(),
490 (safe) ? "" : "via stub");
491 }
492 }
493 // We can't check this anymore. With lazy deopt we could have already
494 // cleaned this IC entry before we even return. This is possible if
495 // we ran out of space in the inline cache buffer trying to do the
496 // set_next and we safepointed to free up space. This is a benign
497 // race because the IC entry was complete when we safepointed so
498 // cleaning it immediately is harmless.
499 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
500 return true;
501 }
502
503
504 // is_optimized: Compiler has generated an optimized call (i.e. fixed, no inline cache)
505 // static_bound: The call can be static bound. If it isn't also optimized, the property
506 // wasn't provable at time of compilation. An optimized call will have any necessary
507 // null check, while a static_bound won't. A static_bound (but not optimized) must
508 // therefore use the unverified entry point.
509 void CompiledIC::compute_monomorphic_entry(const methodHandle& method,
510 Klass* receiver_klass,
511 bool is_optimized,
512 bool static_bound,
513 bool caller_is_nmethod,
514 CompiledICInfo& info,
515 TRAPS) {
516 CompiledMethod* method_code = method->code();
517
518 address entry = NULL;
519 if (method_code != NULL && method_code->is_in_use()) {
520 assert(method_code->is_compiled(), "must be compiled");
521 // Call to compiled code
522 //
523 // Note: the following problem exists with Compiler1:
524 // - at compile time we may or may not know if the destination is final
525 // - if we know that the destination is final (is_optimized), we will emit
526 // an optimized virtual call (no inline cache), and need a Method* to make
527 // a call to the interpreter
528 // - if we don't know if the destination is final, we emit a standard
529 // virtual call, and use CompiledICHolder to call interpreted code
530 // (no static call stub has been generated)
531 // - In the case that we here notice the call is static bound we
532 // convert the call into what looks to be an optimized virtual call,
533 // but we must use the unverified entry point (since there will be no
534 // null check on a call when the target isn't loaded).
535 // This causes problems when verifying the IC because
536 // it looks vanilla but is optimized. Code in is_call_to_interpreted
537 // is aware of this and weakens its asserts.
538 if (is_optimized) {
539 entry = method_code->verified_entry_point();
540 } else {
541 entry = method_code->entry_point();
542 }
543 }
544 bool far_c2a = entry != NULL && caller_is_nmethod && method_code->is_far_code();
545 if (entry != NULL && !far_c2a) {
546 // Call to near compiled code (nmethod or aot).
547 info.set_compiled_entry(entry, is_optimized ? NULL : receiver_klass, is_optimized);
548 } else {
549 if (is_optimized) {
550 if (far_c2a) {
551 // Call to aot code from nmethod.
552 info.set_aot_entry(entry, method());
553 } else {
554 // Use stub entry
555 info.set_interpreter_entry(method()->get_c2i_entry(), method());
556 }
557 } else {
558 // Use icholder entry
559 assert(method_code == NULL || method_code->is_compiled(), "must be compiled");
560 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass);
561 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
562 }
563 }
564 assert(info.is_optimized() == is_optimized, "must agree");
565 }
566
567
568 bool CompiledIC::is_icholder_entry(address entry) {
569 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
570 if (cb != NULL && cb->is_adapter_blob()) {
571 return true;
572 }
573 // itable stubs also use CompiledICHolder
574 if (cb != NULL && cb->is_vtable_blob()) {
575 VtableStub* s = VtableStubs::entry_point(entry);
576 return (s != NULL) && s->is_itable_stub();
577 }
578
579 return false;
580 }
581
582 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
583 // This call site might have become stale so inspect it carefully.
584 address dest = cm->call_wrapper_at(call_site->addr())->destination();
585 return is_icholder_entry(dest);
586 }
587
588 // Release the CompiledICHolder* associated with this call site is there is one.
589 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
590 assert(cm->is_nmethod(), "must be nmethod");
591 // This call site might have become stale so inspect it carefully.
592 NativeCall* call = nativeCall_at(call_site->addr());
593 if (is_icholder_entry(call->destination())) {
594 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
595 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
596 }
597 }
598
599 // ----------------------------------------------------------------------------
600
601 bool CompiledStaticCall::set_to_clean(bool in_use) {
602 // in_use is unused but needed to match template function in CompiledMethod
603 assert(CompiledICLocker::is_safe(instruction_address()), "mt unsafe call");
604 // Reset call site
605 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
606 set_destination_mt_safe(resolve_call_stub());
607
608 // Do not reset stub here: It is too expensive to call find_stub.
609 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
610 // both the call and its stub.
611 return true;
612 }
613
614 bool CompiledStaticCall::is_clean() const {
615 return destination() == resolve_call_stub();
616 }
617
618 bool CompiledStaticCall::is_call_to_compiled() const {
619 return CodeCache::contains(destination());
620 }
621
622 bool CompiledDirectStaticCall::is_call_to_interpreted() const {
623 // It is a call to interpreted, if it calls to a stub. Hence, the destination
624 // must be in the stub part of the nmethod that contains the call
625 CompiledMethod* cm = CodeCache::find_compiled(instruction_address());
626 return cm->stub_contains(destination());
627 }
628
629 bool CompiledDirectStaticCall::is_call_to_far() const {
630 // It is a call to aot method, if it calls to a stub. Hence, the destination
631 // must be in the stub part of the nmethod that contains the call
632 CodeBlob* desc = CodeCache::find_blob(instruction_address());
633 return desc->as_compiled_method()->stub_contains(destination());
634 }
635
636 void CompiledStaticCall::set_to_compiled(address entry) {
637 if (TraceICs) {
638 ResourceMark rm;
639 tty->print_cr("%s@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
640 name(),
641 p2i(instruction_address()),
642 p2i(entry));
643 }
644 // Call to compiled code
645 assert(CodeCache::contains(entry), "wrong entry point");
646 set_destination_mt_safe(entry);
647 }
648
649 void CompiledStaticCall::set(const StaticCallInfo& info) {
650 assert(CompiledICLocker::is_safe(instruction_address()), "mt unsafe call");
651 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
652 // Updating a cache to the wrong entry can cause bugs that are very hard
653 // to track down - if cache entry gets invalid - we just clean it. In
654 // this way it is always the same code path that is responsible for
655 // updating and resolving an inline cache
656 assert(is_clean(), "do not update a call entry - use clean");
657
658 if (info._to_interpreter) {
659 // Call to interpreted code
660 set_to_interpreted(info.callee(), info.entry());
661 #if INCLUDE_AOT
662 } else if (info._to_aot) {
663 // Call to far code
664 set_to_far(info.callee(), info.entry());
665 #endif
666 } else {
667 set_to_compiled(info.entry());
668 }
669 }
670
671 // Compute settings for a CompiledStaticCall. Since we might have to set
672 // the stub when calling to the interpreter, we need to return arguments.
673 void CompiledStaticCall::compute_entry(const methodHandle& m, bool caller_is_nmethod, StaticCallInfo& info) {
674 CompiledMethod* m_code = m->code();
675 info._callee = m;
676 if (m_code != NULL && m_code->is_in_use()) {
677 if (caller_is_nmethod && m_code->is_far_code()) {
678 // Call to far aot code from nmethod.
679 info._to_aot = true;
680 } else {
681 info._to_aot = false;
682 }
683 info._to_interpreter = false;
684 info._entry = m_code->verified_entry_point();
685 } else {
686 // Callee is interpreted code. In any case entering the interpreter
687 // puts a converter-frame on the stack to save arguments.
688 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics");
689 info._to_interpreter = true;
690 info._entry = m()->get_c2i_entry();
691 }
692 }
693
694 address CompiledDirectStaticCall::find_stub_for(address instruction, bool is_aot) {
695 // Find reloc. information containing this call-site
696 RelocIterator iter((nmethod*)NULL, instruction);
697 while (iter.next()) {
698 if (iter.addr() == instruction) {
699 switch(iter.type()) {
700 case relocInfo::static_call_type:
701 return iter.static_call_reloc()->static_stub(is_aot);
702 // We check here for opt_virtual_call_type, since we reuse the code
703 // from the CompiledIC implementation
704 case relocInfo::opt_virtual_call_type:
705 return iter.opt_virtual_call_reloc()->static_stub(is_aot);
706 case relocInfo::poll_type:
707 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
708 default:
709 ShouldNotReachHere();
710 }
711 }
712 }
713 return NULL;
714 }
715
716 address CompiledDirectStaticCall::find_stub(bool is_aot) {
717 return CompiledDirectStaticCall::find_stub_for(instruction_address(), is_aot);
718 }
719
720 address CompiledDirectStaticCall::resolve_call_stub() const {
721 return SharedRuntime::get_resolve_static_call_stub();
722 }
723
724 //-----------------------------------------------------------------------------
725 // Non-product mode code
726 #ifndef PRODUCT
727
728 void CompiledIC::verify() {
729 _call->verify();
730 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
731 || is_optimized() || is_megamorphic(), "sanity check");
732 }
733
734 void CompiledIC::print() {
735 print_compiled_ic();
736 tty->cr();
737 }
738
739 void CompiledIC::print_compiled_ic() {
740 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
741 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
742 }
743
744 void CompiledDirectStaticCall::print() {
745 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
746 if (is_clean()) {
747 tty->print("clean");
748 } else if (is_call_to_compiled()) {
749 tty->print("compiled");
750 } else if (is_call_to_far()) {
751 tty->print("far");
752 } else if (is_call_to_interpreted()) {
753 tty->print("interpreted");
754 }
755 tty->cr();
756 }
757
758 #endif // !PRODUCT