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