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