1 /*
2 * Copyright (c) 1997, 2015, 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 "oops/method.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "oops/symbol.hpp"
39 #include "runtime/icache.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "utilities/events.hpp"
43
44
45 // Every time a compiled IC is changed or its type is being accessed,
46 // either the CompiledIC_lock must be set or we must be at a safe point.
47
48 //-----------------------------------------------------------------------------
49 // Low-level access to an inline cache. Private, since they might not be
50 // MT-safe to use.
51
52 void* CompiledIC::cached_value() const {
53 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
54 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
55
56 if (!is_in_transition_state()) {
57 void* data = (void*)_value->data();
58 // If we let the metadata value here be initialized to zero...
59 assert(data != NULL || Universe::non_oop_word() == NULL,
60 "no raw nulls in CompiledIC metadatas, because of patching races");
61 return (data == (void*)Universe::non_oop_word()) ? NULL : data;
62 } else {
63 return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
64 }
65 }
66
67
68 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
69 assert(entry_point != NULL, "must set legal entry point");
70 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
71 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
72 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
73
74 assert(!is_icholder || is_icholder_entry(entry_point), "must be");
75
76 // Don't use ic_destination for this test since that forwards
77 // through ICBuffer instead of returning the actual current state of
78 // the CompiledIC.
79 if (is_icholder_entry(_ic_call->destination())) {
80 // When patching for the ICStub case the cached value isn't
81 // overwritten until the ICStub copied into the CompiledIC during
82 // the next safepoint. Make sure that the CompiledICHolder* is
83 // marked for release at this point since it won't be identifiable
84 // once the entry point is overwritten.
85 InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data());
86 }
87
88 if (TraceCompiledIC) {
89 tty->print(" ");
90 print_compiled_ic();
91 tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point));
92 if (!is_optimized()) {
93 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache));
94 }
95 if (is_icstub) {
96 tty->print(" (icstub)");
97 }
98 tty->cr();
99 }
100
101 {
102 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
103 #ifdef ASSERT
104 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
105 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
106 #endif
107 _ic_call->set_destination_mt_safe(entry_point);
108 }
109
110 if (is_optimized() || is_icstub) {
111 // Optimized call sites don't have a cache value and ICStub call
112 // sites only change the entry point. Changing the value in that
113 // case could lead to MT safety issues.
114 assert(cache == NULL, "must be null");
115 return;
116 }
117
118 if (cache == NULL) cache = (void*)Universe::non_oop_word();
119
120 _value->set_data((intptr_t)cache);
121 }
122
123
124 void CompiledIC::set_ic_destination(ICStub* stub) {
125 internal_set_ic_destination(stub->code_begin(), true, NULL, false);
126 }
127
128
129
130 address CompiledIC::ic_destination() const {
131 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
132 if (!is_in_transition_state()) {
133 return _ic_call->destination();
134 } else {
135 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
136 }
137 }
138
139
140 bool CompiledIC::is_in_transition_state() const {
141 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
142 return InlineCacheBuffer::contains(_ic_call->destination());
143 }
144
145
146 bool CompiledIC::is_icholder_call() const {
147 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
148 return !_is_optimized && is_icholder_entry(ic_destination());
149 }
150
151 // Returns native address of 'call' instruction in inline-cache. Used by
152 // the InlineCacheBuffer when it needs to find the stub.
153 address CompiledIC::stub_address() const {
154 assert(is_in_transition_state(), "should only be called when we are in a transition state");
155 return _ic_call->destination();
156 }
157
158 // Clears the IC stub if the compiled IC is in transition state
159 void CompiledIC::clear_ic_stub() {
160 if (is_in_transition_state()) {
161 ICStub* stub = ICStub_from_destination_address(stub_address());
162 stub->clear();
163 }
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() == _ic_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 = nativeMovConstReg_at(r->cached_value());
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(nmethod* nm, NativeCall* call)
185 : _ic_call(call)
186 {
187 address ic_call = _ic_call->instruction_address();
188
189 assert(ic_call != NULL, "ic_call address must be set");
190 assert(nm != NULL, "must pass nmethod");
191 assert(nm->contains(ic_call), "must be in nmethod");
192
193 // Search for the ic_call at the given address.
194 RelocIterator iter(nm, ic_call, ic_call+1);
195 bool ret = iter.next();
196 assert(ret == true, "relocInfo must exist at this address");
197 assert(iter.addr() == ic_call, "must find ic_call");
198
199 initialize_from_iter(&iter);
200 }
201
202 CompiledIC::CompiledIC(RelocIterator* iter)
203 : _ic_call(nativeCall_at(iter->addr()))
204 {
205 address ic_call = _ic_call->instruction_address();
206
207 nmethod* nm = iter->code();
208 assert(ic_call != NULL, "ic_call address must be set");
209 assert(nm != NULL, "must pass nmethod");
210 assert(nm->contains(ic_call), "must be in nmethod");
211
212 initialize_from_iter(iter);
213 }
214
215 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
216 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
217 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
218 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
219
220 address entry;
221 if (call_info->call_kind() == CallInfo::itable_call) {
222 assert(bytecode == Bytecodes::_invokeinterface, "");
223 int itable_index = call_info->itable_index();
224 entry = VtableStubs::find_itable_stub(itable_index);
225 if (entry == false) {
226 return false;
227 }
228 #ifdef ASSERT
229 int index = call_info->resolved_method()->itable_index();
230 assert(index == itable_index, "CallInfo pre-computes this");
231 #endif //ASSERT
232 InstanceKlass* k = call_info->resolved_method()->method_holder();
233 assert(k->verify_itable_index(itable_index), "sanity check");
234 InlineCacheBuffer::create_transition_stub(this, k, entry);
235 } else {
236 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
237 // Can be different than selected_method->vtable_index(), due to package-private etc.
238 int vtable_index = call_info->vtable_index();
239 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
240 entry = VtableStubs::find_vtable_stub(vtable_index);
241 if (entry == NULL) {
242 return false;
243 }
244 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
245 }
246
247 if (TraceICs) {
248 ResourceMark rm;
249 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
250 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
251 }
252
253 // We can't check this anymore. With lazy deopt we could have already
254 // cleaned this IC entry before we even return. This is possible if
255 // we ran out of space in the inline cache buffer trying to do the
256 // set_next and we safepointed to free up space. This is a benign
257 // race because the IC entry was complete when we safepointed so
258 // cleaning it immediately is harmless.
259 // assert(is_megamorphic(), "sanity check");
260 return true;
261 }
262
263
264 // true if destination is megamorphic stub
265 bool CompiledIC::is_megamorphic() const {
266 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
267 assert(!is_optimized(), "an optimized call cannot be megamorphic");
268
269 // Cannot rely on cached_value. It is either an interface or a method.
270 return VtableStubs::is_entry_point(ic_destination());
271 }
272
273 bool CompiledIC::is_call_to_compiled() const {
274 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
275
276 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
277 // method is guaranteed to still exist, since we only remove methods after all inline caches
278 // has been cleaned up
279 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
280 bool is_monomorphic = (cb != NULL && cb->is_nmethod());
281 // Check that the cached_value is a klass for non-optimized monomorphic calls
282 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
283 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL).
284 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized
285 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites.
286 #ifdef ASSERT
287 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
288 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci();
289 assert( is_c1_or_jvmci_method ||
290 !is_monomorphic ||
291 is_optimized() ||
292 !caller->is_alive() ||
293 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
294 #endif // ASSERT
295 return is_monomorphic;
296 }
297
298
299 bool CompiledIC::is_call_to_interpreted() const {
300 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
301 // Call to interpreter if destination is either calling to a stub (if it
302 // is optimized), or calling to an I2C blob
303 bool is_call_to_interpreted = false;
304 if (!is_optimized()) {
305 // must use unsafe because the destination can be a zombie (and we're cleaning)
306 // and the print_compiled_ic code wants to know if site (in the non-zombie)
307 // is to the interpreter.
308 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
309 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
310 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
311 } else {
312 // Check if we are calling into our own codeblob (i.e., to a stub)
313 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
314 address dest = ic_destination();
315 #ifdef ASSERT
316 {
317 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
318 assert(!db->is_adapter_blob(), "must use stub!");
319 }
320 #endif /* ASSERT */
321 is_call_to_interpreted = cb->contains(dest);
322 }
323 return is_call_to_interpreted;
324 }
325
326
327 void CompiledIC::set_to_clean(bool in_use) {
328 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
329 if (TraceInlineCacheClearing || TraceICs) {
330 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
331 print();
332 }
333
334 address entry;
335 if (is_optimized()) {
336 entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
337 } else {
338 entry = SharedRuntime::get_resolve_virtual_call_stub();
339 }
340
341 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
342 // we only need to patch the destination
343 bool safe_transition = !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint();
344
345 if (safe_transition) {
346 // Kill any leftover stub we might have too
347 clear_ic_stub();
348 if (is_optimized()) {
349 set_ic_destination(entry);
350 } else {
351 set_ic_destination_and_value(entry, (void*)NULL);
352 }
353 } else {
354 // Unsafe transition - create stub.
355 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
356 }
357 // We can't check this anymore. With lazy deopt we could have already
358 // cleaned this IC entry before we even return. This is possible if
359 // we ran out of space in the inline cache buffer trying to do the
360 // set_next and we safepointed to free up space. This is a benign
361 // race because the IC entry was complete when we safepointed so
362 // cleaning it immediately is harmless.
363 // assert(is_clean(), "sanity check");
364 }
365
366
367 bool CompiledIC::is_clean() const {
368 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
369 bool is_clean = false;
370 address dest = ic_destination();
371 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
372 dest == SharedRuntime::get_resolve_virtual_call_stub();
373 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
374 return is_clean;
375 }
376
377
378 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
379 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
380 // Updating a cache to the wrong entry can cause bugs that are very hard
381 // to track down - if cache entry gets invalid - we just clean it. In
382 // this way it is always the same code path that is responsible for
383 // updating and resolving an inline cache
384 //
385 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
386 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
387 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
388 //
389 // In both of these cases the only thing being modifed is the jump/call target and these
390 // transitions are mt_safe
391
392 Thread *thread = Thread::current();
393 if (info.to_interpreter()) {
394 // Call to interpreter
395 if (info.is_optimized() && is_optimized()) {
396 assert(is_clean(), "unsafe IC path");
397 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
398 // the call analysis (callee structure) specifies that the call is optimized
399 // (either because of CHA or the static target is final)
400 // At code generation time, this call has been emitted as static call
401 // Call via stub
402 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
403 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
404 methodHandle method (thread, (Method*)info.cached_metadata());
405 csc->set_to_interpreted(method, info.entry());
406 if (TraceICs) {
407 ResourceMark rm(thread);
408 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
409 p2i(instruction_address()),
410 method->print_value_string());
411 }
412 } else {
413 // Call via method-klass-holder
414 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
415 if (TraceICs) {
416 ResourceMark rm(thread);
417 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
418 }
419 }
420 } else {
421 // Call to compiled code
422 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
423 #ifdef ASSERT
424 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
425 assert (cb->is_nmethod(), "must be compiled!");
426 #endif /* ASSERT */
427
428 // This is MT safe if we come from a clean-cache and go through a
429 // non-verified entry point
430 bool safe = SafepointSynchronize::is_at_safepoint() ||
431 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
432
433 if (!safe) {
434 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
435 } else {
436 if (is_optimized()) {
437 set_ic_destination(info.entry());
438 } else {
439 set_ic_destination_and_value(info.entry(), info.cached_metadata());
440 }
441 }
442
443 if (TraceICs) {
444 ResourceMark rm(thread);
445 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
446 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
447 p2i(instruction_address()),
448 ((Klass*)info.cached_metadata())->print_value_string(),
449 (safe) ? "" : "via stub");
450 }
451 }
452 // We can't check this anymore. With lazy deopt we could have already
453 // cleaned this IC entry before we even return. This is possible if
454 // we ran out of space in the inline cache buffer trying to do the
455 // set_next and we safepointed to free up space. This is a benign
456 // race because the IC entry was complete when we safepointed so
457 // cleaning it immediately is harmless.
458 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
459 }
460
461
462 // is_optimized: Compiler has generated an optimized call (i.e., no inline
463 // cache) static_bound: The call can be static bound (i.e, no need to use
464 // inline cache)
465 void CompiledIC::compute_monomorphic_entry(const methodHandle& method,
466 KlassHandle receiver_klass,
467 bool is_optimized,
468 bool static_bound,
469 CompiledICInfo& info,
470 TRAPS) {
471 nmethod* method_code = method->code();
472 address entry = NULL;
473 if (method_code != NULL && method_code->is_in_use()) {
474 // Call to compiled code
475 if (static_bound || is_optimized) {
476 entry = method_code->verified_entry_point();
477 } else {
478 entry = method_code->entry_point();
479 }
480 }
481 if (entry != NULL) {
482 // Call to compiled code
483 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
484 } else {
485 // Note: the following problem exists with Compiler1:
486 // - at compile time we may or may not know if the destination is final
487 // - if we know that the destination is final, we will emit an optimized
488 // virtual call (no inline cache), and need a Method* to make a call
489 // to the interpreter
490 // - if we do not know if the destination is final, we emit a standard
491 // virtual call, and use CompiledICHolder to call interpreted code
492 // (no static call stub has been generated)
493 // However in that case we will now notice it is static_bound
494 // and convert the call into what looks to be an optimized
495 // virtual call. This causes problems in verifying the IC because
496 // it look vanilla but is optimized. Code in is_call_to_interpreted
497 // is aware of this and weakens its asserts.
498
499 // static_bound should imply is_optimized -- otherwise we have a
500 // performance bug (statically-bindable method is called via
501 // dynamically-dispatched call note: the reverse implication isn't
502 // necessarily true -- the call may have been optimized based on compiler
503 // analysis (static_bound is only based on "final" etc.)
504 #ifdef COMPILER2
505 #ifdef TIERED
506 #if defined(ASSERT)
507 // can't check the assert because we don't have the CompiledIC with which to
508 // find the address if the call instruction.
509 //
510 // CodeBlob* cb = find_blob_unsafe(instruction_address());
511 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
512 #endif // ASSERT
513 #else
514 assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
515 #endif // TIERED
516 #endif // COMPILER2
517 if (is_optimized) {
518 // Use stub entry
519 info.set_interpreter_entry(method()->get_c2i_entry(), method());
520 } else {
521 // Use icholder entry
522 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
523 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
524 }
525 }
526 assert(info.is_optimized() == is_optimized, "must agree");
527 }
528
529
530 bool CompiledIC::is_icholder_entry(address entry) {
531 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
532 return (cb != NULL && cb->is_adapter_blob());
533 }
534
535 // ----------------------------------------------------------------------------
536
537 void CompiledStaticCall::set_to_clean() {
538 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
539 // Reset call site
540 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
541 #ifdef ASSERT
542 CodeBlob* cb = CodeCache::find_blob_unsafe(this);
543 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
544 #endif
545 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
546
547 // Do not reset stub here: It is too expensive to call find_stub.
548 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
549 // both the call and its stub.
550 }
551
552
553 bool CompiledStaticCall::is_clean() const {
554 return destination() == SharedRuntime::get_resolve_static_call_stub();
555 }
556
557 bool CompiledStaticCall::is_call_to_compiled() const {
558 return CodeCache::contains(destination());
559 }
560
561
562 bool CompiledStaticCall::is_call_to_interpreted() const {
563 // It is a call to interpreted, if it calls to a stub. Hence, the destination
564 // must be in the stub part of the nmethod that contains the call
565 nmethod* nm = CodeCache::find_nmethod(instruction_address());
566 return nm->stub_contains(destination());
567 }
568
569 void CompiledStaticCall::set(const StaticCallInfo& info) {
570 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
571 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
572 // Updating a cache to the wrong entry can cause bugs that are very hard
573 // to track down - if cache entry gets invalid - we just clean it. In
574 // this way it is always the same code path that is responsible for
575 // updating and resolving an inline cache
576 assert(is_clean(), "do not update a call entry - use clean");
577
578 if (info._to_interpreter) {
579 // Call to interpreted code
580 set_to_interpreted(info.callee(), info.entry());
581 } else {
582 if (TraceICs) {
583 ResourceMark rm;
584 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
585 p2i(instruction_address()),
586 p2i(info.entry()));
587 }
588 // Call to compiled code
589 assert (CodeCache::contains(info.entry()), "wrong entry point");
590 set_destination_mt_safe(info.entry());
591 }
592 }
593
594
595 // Compute settings for a CompiledStaticCall. Since we might have to set
596 // the stub when calling to the interpreter, we need to return arguments.
597 void CompiledStaticCall::compute_entry(const methodHandle& m, StaticCallInfo& info) {
598 nmethod* m_code = m->code();
599 info._callee = m;
600 if (m_code != NULL && m_code->is_in_use()) {
601 info._to_interpreter = false;
602 info._entry = m_code->verified_entry_point();
603 } else {
604 // Callee is interpreted code. In any case entering the interpreter
605 // puts a converter-frame on the stack to save arguments.
606 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics");
607 info._to_interpreter = true;
608 info._entry = m()->get_c2i_entry();
609 }
610 }
611
612 address CompiledStaticCall::find_stub() {
613 // Find reloc. information containing this call-site
614 RelocIterator iter((nmethod*)NULL, instruction_address());
615 while (iter.next()) {
616 if (iter.addr() == instruction_address()) {
617 switch(iter.type()) {
618 case relocInfo::static_call_type:
619 return iter.static_call_reloc()->static_stub();
620 // We check here for opt_virtual_call_type, since we reuse the code
621 // from the CompiledIC implementation
622 case relocInfo::opt_virtual_call_type:
623 return iter.opt_virtual_call_reloc()->static_stub();
624 case relocInfo::poll_type:
625 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
626 default:
627 ShouldNotReachHere();
628 }
629 }
630 }
631 return NULL;
632 }
633
634
635 //-----------------------------------------------------------------------------
636 // Non-product mode code
637 #ifndef PRODUCT
638
639 void CompiledIC::verify() {
640 // make sure code pattern is actually a call imm32 instruction
641 _ic_call->verify();
642 if (os::is_MP()) {
643 _ic_call->verify_alignment();
644 }
645 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
646 || is_optimized() || is_megamorphic(), "sanity check");
647 }
648
649 void CompiledIC::print() {
650 print_compiled_ic();
651 tty->cr();
652 }
653
654 void CompiledIC::print_compiled_ic() {
655 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
656 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
657 }
658
659 void CompiledStaticCall::print() {
660 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
661 if (is_clean()) {
662 tty->print("clean");
663 } else if (is_call_to_compiled()) {
664 tty->print("compiled");
665 } else if (is_call_to_interpreted()) {
666 tty->print("interpreted");
667 }
668 tty->cr();
669 }
670
671 #endif // !PRODUCT