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