Mon, 07 Jul 2014 10:12:40 +0200
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
1 /*
2 * Copyright (c) 1997, 2014, 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
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7 * published by the Free Software Foundation.
8 *
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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 *
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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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23 */
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"
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.
48 //-----------------------------------------------------------------------------
49 // Low-level access to an inline cache. Private, since they might not be
50 // MT-safe to use.
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");
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 }
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");
74 assert(!is_icholder || is_icholder_entry(entry_point), "must be");
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 }
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 }
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 }
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 }
118 if (cache == NULL) cache = (void*)Universe::non_oop_word();
120 _value->set_data((intptr_t)cache);
121 }
124 void CompiledIC::set_ic_destination(ICStub* stub) {
125 internal_set_ic_destination(stub->code_begin(), true, NULL, false);
126 }
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 }
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 }
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 }
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 }
159 //-----------------------------------------------------------------------------
160 // High-level access to an inline cache. Guaranteed to be MT-safe.
162 void CompiledIC::initialize_from_iter(RelocIterator* iter) {
163 assert(iter->addr() == _ic_call->instruction_address(), "must find ic_call");
165 if (iter->type() == relocInfo::virtual_call_type) {
166 virtual_call_Relocation* r = iter->virtual_call_reloc();
167 _is_optimized = false;
168 _value = nativeMovConstReg_at(r->cached_value());
169 } else {
170 assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
171 _is_optimized = true;
172 _value = NULL;
173 }
174 }
176 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
177 : _ic_call(call)
178 {
179 address ic_call = _ic_call->instruction_address();
181 assert(ic_call != NULL, "ic_call address must be set");
182 assert(nm != NULL, "must pass nmethod");
183 assert(nm->contains(ic_call), "must be in nmethod");
185 // Search for the ic_call at the given address.
186 RelocIterator iter(nm, ic_call, ic_call+1);
187 bool ret = iter.next();
188 assert(ret == true, "relocInfo must exist at this address");
189 assert(iter.addr() == ic_call, "must find ic_call");
191 initialize_from_iter(&iter);
192 }
194 CompiledIC::CompiledIC(RelocIterator* iter)
195 : _ic_call(nativeCall_at(iter->addr()))
196 {
197 address ic_call = _ic_call->instruction_address();
199 nmethod* nm = iter->code();
200 assert(ic_call != NULL, "ic_call address must be set");
201 assert(nm != NULL, "must pass nmethod");
202 assert(nm->contains(ic_call), "must be in nmethod");
204 initialize_from_iter(iter);
205 }
207 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
208 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
209 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
210 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
212 address entry;
213 if (call_info->call_kind() == CallInfo::itable_call) {
214 assert(bytecode == Bytecodes::_invokeinterface, "");
215 int itable_index = call_info->itable_index();
216 entry = VtableStubs::find_itable_stub(itable_index);
217 if (entry == false) {
218 return false;
219 }
220 #ifdef ASSERT
221 int index = call_info->resolved_method()->itable_index();
222 assert(index == itable_index, "CallInfo pre-computes this");
223 #endif //ASSERT
224 InstanceKlass* k = call_info->resolved_method()->method_holder();
225 assert(k->verify_itable_index(itable_index), "sanity check");
226 InlineCacheBuffer::create_transition_stub(this, k, entry);
227 } else {
228 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
229 // Can be different than selected_method->vtable_index(), due to package-private etc.
230 int vtable_index = call_info->vtable_index();
231 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
232 entry = VtableStubs::find_vtable_stub(vtable_index);
233 if (entry == NULL) {
234 return false;
235 }
236 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
237 }
239 if (TraceICs) {
240 ResourceMark rm;
241 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
242 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
243 }
245 // We can't check this anymore. With lazy deopt we could have already
246 // cleaned this IC entry before we even return. This is possible if
247 // we ran out of space in the inline cache buffer trying to do the
248 // set_next and we safepointed to free up space. This is a benign
249 // race because the IC entry was complete when we safepointed so
250 // cleaning it immediately is harmless.
251 // assert(is_megamorphic(), "sanity check");
252 return true;
253 }
256 // true if destination is megamorphic stub
257 bool CompiledIC::is_megamorphic() const {
258 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
259 assert(!is_optimized(), "an optimized call cannot be megamorphic");
261 // Cannot rely on cached_value. It is either an interface or a method.
262 return VtableStubs::is_entry_point(ic_destination());
263 }
265 bool CompiledIC::is_call_to_compiled() const {
266 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
268 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
269 // method is guaranteed to still exist, since we only remove methods after all inline caches
270 // has been cleaned up
271 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
272 bool is_monomorphic = (cb != NULL && cb->is_nmethod());
273 // Check that the cached_value is a klass for non-optimized monomorphic calls
274 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
275 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL)
276 #ifdef ASSERT
277 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
278 bool is_c1_method = caller->is_compiled_by_c1();
279 assert( is_c1_method ||
280 !is_monomorphic ||
281 is_optimized() ||
282 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
283 #endif // ASSERT
284 return is_monomorphic;
285 }
288 bool CompiledIC::is_call_to_interpreted() const {
289 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
290 // Call to interpreter if destination is either calling to a stub (if it
291 // is optimized), or calling to an I2C blob
292 bool is_call_to_interpreted = false;
293 if (!is_optimized()) {
294 // must use unsafe because the destination can be a zombie (and we're cleaning)
295 // and the print_compiled_ic code wants to know if site (in the non-zombie)
296 // is to the interpreter.
297 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
298 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
299 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
300 } else {
301 // Check if we are calling into our own codeblob (i.e., to a stub)
302 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
303 address dest = ic_destination();
304 #ifdef ASSERT
305 {
306 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
307 assert(!db->is_adapter_blob(), "must use stub!");
308 }
309 #endif /* ASSERT */
310 is_call_to_interpreted = cb->contains(dest);
311 }
312 return is_call_to_interpreted;
313 }
316 void CompiledIC::set_to_clean() {
317 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
318 if (TraceInlineCacheClearing || TraceICs) {
319 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
320 print();
321 }
323 address entry;
324 if (is_optimized()) {
325 entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
326 } else {
327 entry = SharedRuntime::get_resolve_virtual_call_stub();
328 }
330 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
331 // we only need to patch the destination
332 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
334 if (safe_transition) {
335 // Kill any leftover stub we might have too
336 if (is_in_transition_state()) {
337 ICStub* old_stub = ICStub_from_destination_address(stub_address());
338 old_stub->clear();
339 }
340 if (is_optimized()) {
341 set_ic_destination(entry);
342 } else {
343 set_ic_destination_and_value(entry, (void*)NULL);
344 }
345 } else {
346 // Unsafe transition - create stub.
347 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
348 }
349 // We can't check this anymore. With lazy deopt we could have already
350 // cleaned this IC entry before we even return. This is possible if
351 // we ran out of space in the inline cache buffer trying to do the
352 // set_next and we safepointed to free up space. This is a benign
353 // race because the IC entry was complete when we safepointed so
354 // cleaning it immediately is harmless.
355 // assert(is_clean(), "sanity check");
356 }
359 bool CompiledIC::is_clean() const {
360 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
361 bool is_clean = false;
362 address dest = ic_destination();
363 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
364 dest == SharedRuntime::get_resolve_virtual_call_stub();
365 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
366 return is_clean;
367 }
370 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
371 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
372 // Updating a cache to the wrong entry can cause bugs that are very hard
373 // to track down - if cache entry gets invalid - we just clean it. In
374 // this way it is always the same code path that is responsible for
375 // updating and resolving an inline cache
376 //
377 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
378 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
379 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
380 //
381 // In both of these cases the only thing being modifed is the jump/call target and these
382 // transitions are mt_safe
384 Thread *thread = Thread::current();
385 if (info.to_interpreter()) {
386 // Call to interpreter
387 if (info.is_optimized() && is_optimized()) {
388 assert(is_clean(), "unsafe IC path");
389 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
390 // the call analysis (callee structure) specifies that the call is optimized
391 // (either because of CHA or the static target is final)
392 // At code generation time, this call has been emitted as static call
393 // Call via stub
394 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
395 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
396 methodHandle method (thread, (Method*)info.cached_metadata());
397 csc->set_to_interpreted(method, info.entry());
398 if (TraceICs) {
399 ResourceMark rm(thread);
400 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
401 p2i(instruction_address()),
402 method->print_value_string());
403 }
404 } else {
405 // Call via method-klass-holder
406 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
407 if (TraceICs) {
408 ResourceMark rm(thread);
409 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
410 }
411 }
412 } else {
413 // Call to compiled code
414 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
415 #ifdef ASSERT
416 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
417 assert (cb->is_nmethod(), "must be compiled!");
418 #endif /* ASSERT */
420 // This is MT safe if we come from a clean-cache and go through a
421 // non-verified entry point
422 bool safe = SafepointSynchronize::is_at_safepoint() ||
423 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
425 if (!safe) {
426 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
427 } else {
428 if (is_optimized()) {
429 set_ic_destination(info.entry());
430 } else {
431 set_ic_destination_and_value(info.entry(), info.cached_metadata());
432 }
433 }
435 if (TraceICs) {
436 ResourceMark rm(thread);
437 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
438 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
439 p2i(instruction_address()),
440 ((Klass*)info.cached_metadata())->print_value_string(),
441 (safe) ? "" : "via stub");
442 }
443 }
444 // We can't check this anymore. With lazy deopt we could have already
445 // cleaned this IC entry before we even return. This is possible if
446 // we ran out of space in the inline cache buffer trying to do the
447 // set_next and we safepointed to free up space. This is a benign
448 // race because the IC entry was complete when we safepointed so
449 // cleaning it immediately is harmless.
450 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
451 }
454 // is_optimized: Compiler has generated an optimized call (i.e., no inline
455 // cache) static_bound: The call can be static bound (i.e, no need to use
456 // inline cache)
457 void CompiledIC::compute_monomorphic_entry(methodHandle method,
458 KlassHandle receiver_klass,
459 bool is_optimized,
460 bool static_bound,
461 CompiledICInfo& info,
462 TRAPS) {
463 nmethod* method_code = method->code();
464 address entry = NULL;
465 if (method_code != NULL && method_code->is_in_use()) {
466 // Call to compiled code
467 if (static_bound || is_optimized) {
468 entry = method_code->verified_entry_point();
469 } else {
470 entry = method_code->entry_point();
471 }
472 }
473 if (entry != NULL) {
474 // Call to compiled code
475 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
476 } else {
477 // Note: the following problem exists with Compiler1:
478 // - at compile time we may or may not know if the destination is final
479 // - if we know that the destination is final, we will emit an optimized
480 // virtual call (no inline cache), and need a Method* to make a call
481 // to the interpreter
482 // - if we do not know if the destination is final, we emit a standard
483 // virtual call, and use CompiledICHolder to call interpreted code
484 // (no static call stub has been generated)
485 // However in that case we will now notice it is static_bound
486 // and convert the call into what looks to be an optimized
487 // virtual call. This causes problems in verifying the IC because
488 // it look vanilla but is optimized. Code in is_call_to_interpreted
489 // is aware of this and weakens its asserts.
491 // static_bound should imply is_optimized -- otherwise we have a
492 // performance bug (statically-bindable method is called via
493 // dynamically-dispatched call note: the reverse implication isn't
494 // necessarily true -- the call may have been optimized based on compiler
495 // analysis (static_bound is only based on "final" etc.)
496 #ifdef COMPILER2
497 #ifdef TIERED
498 #if defined(ASSERT)
499 // can't check the assert because we don't have the CompiledIC with which to
500 // find the address if the call instruction.
501 //
502 // CodeBlob* cb = find_blob_unsafe(instruction_address());
503 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
504 #endif // ASSERT
505 #else
506 assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
507 #endif // TIERED
508 #endif // COMPILER2
509 if (is_optimized) {
510 // Use stub entry
511 info.set_interpreter_entry(method()->get_c2i_entry(), method());
512 } else {
513 // Use icholder entry
514 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
515 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
516 }
517 }
518 assert(info.is_optimized() == is_optimized, "must agree");
519 }
522 bool CompiledIC::is_icholder_entry(address entry) {
523 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
524 return (cb != NULL && cb->is_adapter_blob());
525 }
527 // ----------------------------------------------------------------------------
529 void CompiledStaticCall::set_to_clean() {
530 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
531 // Reset call site
532 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
533 #ifdef ASSERT
534 CodeBlob* cb = CodeCache::find_blob_unsafe(this);
535 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
536 #endif
537 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
539 // Do not reset stub here: It is too expensive to call find_stub.
540 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
541 // both the call and its stub.
542 }
545 bool CompiledStaticCall::is_clean() const {
546 return destination() == SharedRuntime::get_resolve_static_call_stub();
547 }
549 bool CompiledStaticCall::is_call_to_compiled() const {
550 return CodeCache::contains(destination());
551 }
554 bool CompiledStaticCall::is_call_to_interpreted() const {
555 // It is a call to interpreted, if it calls to a stub. Hence, the destination
556 // must be in the stub part of the nmethod that contains the call
557 nmethod* nm = CodeCache::find_nmethod(instruction_address());
558 return nm->stub_contains(destination());
559 }
561 void CompiledStaticCall::set(const StaticCallInfo& info) {
562 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
563 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
564 // Updating a cache to the wrong entry can cause bugs that are very hard
565 // to track down - if cache entry gets invalid - we just clean it. In
566 // this way it is always the same code path that is responsible for
567 // updating and resolving an inline cache
568 assert(is_clean(), "do not update a call entry - use clean");
570 if (info._to_interpreter) {
571 // Call to interpreted code
572 set_to_interpreted(info.callee(), info.entry());
573 } else {
574 if (TraceICs) {
575 ResourceMark rm;
576 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
577 p2i(instruction_address()),
578 p2i(info.entry()));
579 }
580 // Call to compiled code
581 assert (CodeCache::contains(info.entry()), "wrong entry point");
582 set_destination_mt_safe(info.entry());
583 }
584 }
587 // Compute settings for a CompiledStaticCall. Since we might have to set
588 // the stub when calling to the interpreter, we need to return arguments.
589 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
590 nmethod* m_code = m->code();
591 info._callee = m;
592 if (m_code != NULL && m_code->is_in_use()) {
593 info._to_interpreter = false;
594 info._entry = m_code->verified_entry_point();
595 } else {
596 // Callee is interpreted code. In any case entering the interpreter
597 // puts a converter-frame on the stack to save arguments.
598 info._to_interpreter = true;
599 info._entry = m()->get_c2i_entry();
600 }
601 }
603 address CompiledStaticCall::find_stub() {
604 // Find reloc. information containing this call-site
605 RelocIterator iter((nmethod*)NULL, instruction_address());
606 while (iter.next()) {
607 if (iter.addr() == instruction_address()) {
608 switch(iter.type()) {
609 case relocInfo::static_call_type:
610 return iter.static_call_reloc()->static_stub();
611 // We check here for opt_virtual_call_type, since we reuse the code
612 // from the CompiledIC implementation
613 case relocInfo::opt_virtual_call_type:
614 return iter.opt_virtual_call_reloc()->static_stub();
615 case relocInfo::poll_type:
616 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
617 default:
618 ShouldNotReachHere();
619 }
620 }
621 }
622 return NULL;
623 }
626 //-----------------------------------------------------------------------------
627 // Non-product mode code
628 #ifndef PRODUCT
630 void CompiledIC::verify() {
631 // make sure code pattern is actually a call imm32 instruction
632 _ic_call->verify();
633 if (os::is_MP()) {
634 _ic_call->verify_alignment();
635 }
636 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
637 || is_optimized() || is_megamorphic(), "sanity check");
638 }
640 void CompiledIC::print() {
641 print_compiled_ic();
642 tty->cr();
643 }
645 void CompiledIC::print_compiled_ic() {
646 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
647 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
648 }
650 void CompiledStaticCall::print() {
651 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
652 if (is_clean()) {
653 tty->print("clean");
654 } else if (is_call_to_compiled()) {
655 tty->print("compiled");
656 } else if (is_call_to_interpreted()) {
657 tty->print("interpreted");
658 }
659 tty->cr();
660 }
662 #endif // !PRODUCT