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 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
241 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
242 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
243 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
244
245 address entry;
246 if (call_info->call_kind() == CallInfo::itable_call) {
247 assert(bytecode == Bytecodes::_invokeinterface, "");
248 int itable_index = call_info->itable_index();
249 entry = VtableStubs::find_itable_stub(itable_index);
250 if (entry == NULL) {
251 return false;
252 }
253 #ifdef ASSERT
254 int index = call_info->resolved_method()->itable_index();
255 assert(index == itable_index, "CallInfo pre-computes this");
256 InstanceKlass* k = call_info->resolved_method()->method_holder();
257 assert(k->verify_itable_index(itable_index), "sanity check");
258 #endif //ASSERT
259 CompiledICHolder* holder = new CompiledICHolder(call_info->resolved_method()->method_holder(),
260 call_info->resolved_klass(), false);
261 holder->claim();
262 if (!InlineCacheBuffer::create_transition_stub(this, holder, entry)) {
263 delete holder;
264 return false;
265 }
266 } else {
267 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
268 // Can be different than selected_method->vtable_index(), due to package-private etc.
269 int vtable_index = call_info->vtable_index();
270 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
271 entry = VtableStubs::find_vtable_stub(vtable_index);
272 if (entry == NULL) {
273 return false;
274 }
275 if (!InlineCacheBuffer::create_transition_stub(this, NULL, entry)) {
276 return false;
277 }
278 }
279
280 if (TraceICs) {
281 ResourceMark rm;
282 assert(!call_info->selected_method().is_null(), "Unexpected null selected method");
283 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
284 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
285 }
286
287 // We can't check this anymore. With lazy deopt we could have already
288 // cleaned this IC entry before we even return. This is possible if
289 // we ran out of space in the inline cache buffer trying to do the
290 // set_next and we safepointed to free up space. This is a benign
291 // race because the IC entry was complete when we safepointed so
292 // cleaning it immediately is harmless.
293 // assert(is_megamorphic(), "sanity check");
294 return true;
295 }
296
297
298 // true if destination is megamorphic stub
299 bool CompiledIC::is_megamorphic() const {
300 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
301 assert(!is_optimized(), "an optimized call cannot be megamorphic");
302
303 // Cannot rely on cached_value. It is either an interface or a method.
304 return VtableStubs::entry_point(ic_destination()) != NULL;
305 }
306
307 bool CompiledIC::is_call_to_compiled() const {
308 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
309
310 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
311 // method is guaranteed to still exist, since we only remove methods after all inline caches
312 // has been cleaned up
313 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
314 bool is_monomorphic = (cb != NULL && cb->is_compiled());
315 // Check that the cached_value is a klass for non-optimized monomorphic calls
316 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
317 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL).
318 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized
319 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites.
320 #ifdef ASSERT
321 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
322 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci();
323 assert( is_c1_or_jvmci_method ||
324 !is_monomorphic ||
325 is_optimized() ||
326 !caller->is_alive() ||
327 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
328 #endif // ASSERT
329 return is_monomorphic;
330 }
331
332
333 bool CompiledIC::is_call_to_interpreted() const {
334 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
335 // Call to interpreter if destination is either calling to a stub (if it
336 // is optimized), or calling to an I2C blob
337 bool is_call_to_interpreted = false;
338 if (!is_optimized()) {
339 // must use unsafe because the destination can be a zombie (and we're cleaning)
340 // and the print_compiled_ic code wants to know if site (in the non-zombie)
341 // is to the interpreter.
342 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
343 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
344 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
345 } else {
346 // Check if we are calling into our own codeblob (i.e., to a stub)
347 address dest = ic_destination();
348 #ifdef ASSERT
349 {
350 _call->verify_resolve_call(dest);
351 }
352 #endif /* ASSERT */
353 is_call_to_interpreted = _call->is_call_to_interpreted(dest);
354 }
355 return is_call_to_interpreted;
356 }
357
358 bool CompiledIC::set_to_clean(bool in_use) {
359 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
360 if (TraceInlineCacheClearing || TraceICs) {
361 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
362 print();
363 }
364
365 address entry = _call->get_resolve_call_stub(is_optimized());
366
367 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
368 // we only need to patch the destination
369 bool safe_transition = _call->is_safe_for_patching() || !in_use || is_optimized() || CompiledICLocker::is_safe(_method);
370
371 if (safe_transition) {
372 // Kill any leftover stub we might have too
373 clear_ic_stub();
374 if (is_optimized()) {
375 set_ic_destination(entry);
376 } else {
377 set_ic_destination_and_value(entry, (void*)NULL);
378 }
379 } else {
380 // Unsafe transition - create stub.
381 if (!InlineCacheBuffer::create_transition_stub(this, NULL, entry)) {
382 return false;
383 }
384 }
385 // We can't check this anymore. With lazy deopt we could have already
386 // cleaned this IC entry before we even return. This is possible if
387 // we ran out of space in the inline cache buffer trying to do the
388 // set_next and we safepointed to free up space. This is a benign
389 // race because the IC entry was complete when we safepointed so
390 // cleaning it immediately is harmless.
391 // assert(is_clean(), "sanity check");
392 return true;
393 }
394
395 bool CompiledIC::is_clean() const {
396 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
397 bool is_clean = false;
398 address dest = ic_destination();
399 is_clean = dest == _call->get_resolve_call_stub(is_optimized());
400 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
401 return is_clean;
402 }
403
404 bool CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
405 assert(CompiledICLocker::is_safe(_method), "mt unsafe call");
406 // Updating a cache to the wrong entry can cause bugs that are very hard
407 // to track down - if cache entry gets invalid - we just clean it. In
408 // this way it is always the same code path that is responsible for
409 // updating and resolving an inline cache
410 //
411 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
412 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
413 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
414 //
415 // In both of these cases the only thing being modifed is the jump/call target and these
416 // transitions are mt_safe
417
418 Thread *thread = Thread::current();
419 if (info.to_interpreter() || info.to_aot()) {
420 // Call to interpreter
421 if (info.is_optimized() && is_optimized()) {
422 assert(is_clean(), "unsafe IC path");
423 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
424 // the call analysis (callee structure) specifies that the call is optimized
425 // (either because of CHA or the static target is final)
426 // At code generation time, this call has been emitted as static call
427 // Call via stub
428 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
429 methodHandle method (thread, (Method*)info.cached_metadata());
430 _call->set_to_interpreted(method, info);
431
432 if (TraceICs) {
433 ResourceMark rm(thread);
434 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to %s: %s",
435 p2i(instruction_address()),
436 (info.to_aot() ? "aot" : "interpreter"),
437 method->print_value_string());
438 }
439 } else {
440 // Call via method-klass-holder
441 CompiledICHolder* holder = info.claim_cached_icholder();
442 if (!InlineCacheBuffer::create_transition_stub(this, holder, info.entry())) {
443 delete holder;
444 return false;
445 }
446 if (TraceICs) {
447 ResourceMark rm(thread);
448 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
449 }
450 }
451 } else {
452 // Call to compiled code
453 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
454 #ifdef ASSERT
455 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
456 assert (cb != NULL && cb->is_compiled(), "must be compiled!");
457 #endif /* ASSERT */
458
459 // This is MT safe if we come from a clean-cache and go through a
460 // non-verified entry point
461 bool safe = SafepointSynchronize::is_at_safepoint() ||
462 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
463
464 if (!safe) {
465 if (!InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry())) {
466 return false;
467 }
468 } else {
469 if (is_optimized()) {
470 set_ic_destination(info.entry());
471 } else {
472 set_ic_destination_and_value(info.entry(), info.cached_metadata());
473 }
474 }
475
476 if (TraceICs) {
477 ResourceMark rm(thread);
478 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
479 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
480 p2i(instruction_address()),
481 ((Klass*)info.cached_metadata())->print_value_string(),
482 (safe) ? "" : "via stub");
483 }
484 }
485 // We can't check this anymore. With lazy deopt we could have already
486 // cleaned this IC entry before we even return. This is possible if
487 // we ran out of space in the inline cache buffer trying to do the
488 // set_next and we safepointed to free up space. This is a benign
489 // race because the IC entry was complete when we safepointed so
490 // cleaning it immediately is harmless.
491 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
492 return true;
493 }
494
495
496 // is_optimized: Compiler has generated an optimized call (i.e. fixed, no inline cache)
497 // static_bound: The call can be static bound. If it isn't also optimized, the property
498 // wasn't provable at time of compilation. An optimized call will have any necessary
499 // null check, while a static_bound won't. A static_bound (but not optimized) must
500 // therefore use the unverified entry point.
501 void CompiledIC::compute_monomorphic_entry(const methodHandle& method,
502 Klass* receiver_klass,
503 bool is_optimized,
504 bool static_bound,
505 bool caller_is_nmethod,
506 CompiledICInfo& info,
507 TRAPS) {
508 CompiledMethod* method_code = method->code();
509
510 address entry = NULL;
511 if (method_code != NULL && method_code->is_in_use()) {
512 assert(method_code->is_compiled(), "must be compiled");
513 // Call to compiled code
514 //
515 // Note: the following problem exists with Compiler1:
516 // - at compile time we may or may not know if the destination is final
517 // - if we know that the destination is final (is_optimized), we will emit
518 // an optimized virtual call (no inline cache), and need a Method* to make
519 // a call to the interpreter
520 // - if we don't know if the destination is final, we emit a standard
521 // virtual call, and use CompiledICHolder to call interpreted code
522 // (no static call stub has been generated)
523 // - In the case that we here notice the call is static bound we
524 // convert the call into what looks to be an optimized virtual call,
525 // but we must use the unverified entry point (since there will be no
526 // null check on a call when the target isn't loaded).
527 // This causes problems when verifying the IC because
528 // it looks vanilla but is optimized. Code in is_call_to_interpreted
529 // is aware of this and weakens its asserts.
530 if (is_optimized) {
531 entry = method_code->verified_entry_point();
532 } else {
533 entry = method_code->entry_point();
534 }
535 }
536 bool far_c2a = entry != NULL && caller_is_nmethod && method_code->is_far_code();
537 if (entry != NULL && !far_c2a) {
538 // Call to near compiled code (nmethod or aot).
539 info.set_compiled_entry(entry, is_optimized ? NULL : receiver_klass, is_optimized);
540 } else {
541 if (is_optimized) {
542 if (far_c2a) {
543 // Call to aot code from nmethod.
544 info.set_aot_entry(entry, method());
545 } else {
546 // Use stub entry
547 info.set_interpreter_entry(method()->get_c2i_entry(), method());
548 }
549 } else {
550 // Use icholder entry
551 assert(method_code == NULL || method_code->is_compiled(), "must be compiled");
552 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass);
553 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
554 }
555 }
556 assert(info.is_optimized() == is_optimized, "must agree");
557 }
558
559
560 bool CompiledIC::is_icholder_entry(address entry) {
561 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
562 if (cb != NULL && cb->is_adapter_blob()) {
563 return true;
564 }
565 // itable stubs also use CompiledICHolder
566 if (cb != NULL && cb->is_vtable_blob()) {
567 VtableStub* s = VtableStubs::entry_point(entry);
568 return (s != NULL) && s->is_itable_stub();
569 }
570
571 return false;
572 }
573
574 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
575 // This call site might have become stale so inspect it carefully.
576 address dest = cm->call_wrapper_at(call_site->addr())->destination();
577 return is_icholder_entry(dest);
578 }
579
580 // Release the CompiledICHolder* associated with this call site is there is one.
581 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
582 assert(cm->is_nmethod(), "must be nmethod");
583 // This call site might have become stale so inspect it carefully.
584 NativeCall* call = nativeCall_at(call_site->addr());
585 if (is_icholder_entry(call->destination())) {
586 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
587 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
588 }
589 }
590
591 // ----------------------------------------------------------------------------
592
593 bool CompiledStaticCall::set_to_clean(bool in_use) {
594 // in_use is unused but needed to match template function in CompiledMethod
595 assert(CompiledICLocker::is_safe(instruction_address()), "mt unsafe call");
596 // Reset call site
597 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
598 set_destination_mt_safe(resolve_call_stub());
599
600 // Do not reset stub here: It is too expensive to call find_stub.
601 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
602 // both the call and its stub.
603 return true;
604 }
605
606 bool CompiledStaticCall::is_clean() const {
607 return destination() == resolve_call_stub();
608 }
609
610 bool CompiledStaticCall::is_call_to_compiled() const {
611 return CodeCache::contains(destination());
612 }
613
614 bool CompiledDirectStaticCall::is_call_to_interpreted() const {
615 // It is a call to interpreted, if it calls to a stub. Hence, the destination
616 // must be in the stub part of the nmethod that contains the call
617 CompiledMethod* cm = CodeCache::find_compiled(instruction_address());
618 return cm->stub_contains(destination());
619 }
620
621 bool CompiledDirectStaticCall::is_call_to_far() const {
622 // It is a call to aot method, if it calls to a stub. Hence, the destination
623 // must be in the stub part of the nmethod that contains the call
624 CodeBlob* desc = CodeCache::find_blob(instruction_address());
625 return desc->as_compiled_method()->stub_contains(destination());
626 }
627
628 void CompiledStaticCall::set_to_compiled(address entry) {
629 if (TraceICs) {
630 ResourceMark rm;
631 tty->print_cr("%s@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
632 name(),
633 p2i(instruction_address()),
634 p2i(entry));
635 }
636 // Call to compiled code
637 assert(CodeCache::contains(entry), "wrong entry point");
638 set_destination_mt_safe(entry);
639 }
640
641 void CompiledStaticCall::set(const StaticCallInfo& info) {
642 assert(CompiledICLocker::is_safe(instruction_address()), "mt unsafe call");
643 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
644 // Updating a cache to the wrong entry can cause bugs that are very hard
645 // to track down - if cache entry gets invalid - we just clean it. In
646 // this way it is always the same code path that is responsible for
647 // updating and resolving an inline cache
648 assert(is_clean(), "do not update a call entry - use clean");
649
650 if (info._to_interpreter) {
651 // Call to interpreted code
652 set_to_interpreted(info.callee(), info.entry());
653 #if INCLUDE_AOT
654 } else if (info._to_aot) {
655 // Call to far code
656 set_to_far(info.callee(), info.entry());
657 #endif
658 } else {
659 set_to_compiled(info.entry());
660 }
661 }
662
663 // Compute settings for a CompiledStaticCall. Since we might have to set
664 // the stub when calling to the interpreter, we need to return arguments.
665 void CompiledStaticCall::compute_entry(const methodHandle& m, bool caller_is_nmethod, StaticCallInfo& info) {
666 CompiledMethod* m_code = m->code();
667 info._callee = m;
668 if (m_code != NULL && m_code->is_in_use()) {
669 if (caller_is_nmethod && m_code->is_far_code()) {
670 // Call to far aot code from nmethod.
671 info._to_aot = true;
672 } else {
673 info._to_aot = false;
674 }
675 info._to_interpreter = false;
676 info._entry = m_code->verified_entry_point();
677 } else {
678 // Callee is interpreted code. In any case entering the interpreter
679 // puts a converter-frame on the stack to save arguments.
680 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics");
681 info._to_interpreter = true;
682 info._entry = m()->get_c2i_entry();
683 }
684 }
685
686 address CompiledDirectStaticCall::find_stub_for(address instruction, bool is_aot) {
687 // Find reloc. information containing this call-site
688 RelocIterator iter((nmethod*)NULL, instruction);
689 while (iter.next()) {
690 if (iter.addr() == instruction) {
691 switch(iter.type()) {
692 case relocInfo::static_call_type:
693 return iter.static_call_reloc()->static_stub(is_aot);
694 // We check here for opt_virtual_call_type, since we reuse the code
695 // from the CompiledIC implementation
696 case relocInfo::opt_virtual_call_type:
697 return iter.opt_virtual_call_reloc()->static_stub(is_aot);
698 case relocInfo::poll_type:
699 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
700 default:
701 ShouldNotReachHere();
702 }
703 }
704 }
705 return NULL;
706 }
707
708 address CompiledDirectStaticCall::find_stub(bool is_aot) {
709 return CompiledDirectStaticCall::find_stub_for(instruction_address(), is_aot);
710 }
711
712 address CompiledDirectStaticCall::resolve_call_stub() const {
713 return SharedRuntime::get_resolve_static_call_stub();
714 }
715
716 //-----------------------------------------------------------------------------
717 // Non-product mode code
718 #ifndef PRODUCT
719
720 void CompiledIC::verify() {
721 _call->verify();
722 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
723 || is_optimized() || is_megamorphic(), "sanity check");
724 }
725
726 void CompiledIC::print() {
727 print_compiled_ic();
728 tty->cr();
729 }
730
731 void CompiledIC::print_compiled_ic() {
732 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
733 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
734 }
735
736 void CompiledDirectStaticCall::print() {
737 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
738 if (is_clean()) {
739 tty->print("clean");
740 } else if (is_call_to_compiled()) {
741 tty->print("compiled");
742 } else if (is_call_to_far()) {
743 tty->print("far");
744 } else if (is_call_to_interpreted()) {
745 tty->print("interpreted");
746 }
747 tty->cr();
748 }
749
750 #endif // !PRODUCT