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
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/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(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
159 //-----------------------------------------------------------------------------
160 // High-level access to an inline cache. Guaranteed to be MT-safe.
161
162 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
163 : _ic_call(call)
164 {
165 address ic_call = call->instruction_address();
166
167 assert(ic_call != NULL, "ic_call address must be set");
168 assert(nm != NULL, "must pass nmethod");
169 assert(nm->contains(ic_call), "must be in nmethod");
170
171 // Search for the ic_call at the given address.
172 RelocIterator iter(nm, ic_call, ic_call+1);
173 bool ret = iter.next();
174 assert(ret == true, "relocInfo must exist at this address");
175 assert(iter.addr() == ic_call, "must find ic_call");
176 if (iter.type() == relocInfo::virtual_call_type) {
177 virtual_call_Relocation* r = iter.virtual_call_reloc();
178 _is_optimized = false;
179 _value = nativeMovConstReg_at(r->cached_value());
180 } else {
181 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
182 _is_optimized = true;
183 _value = NULL;
184 }
185 }
186
187 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
188 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
189 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
190 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
191
192 address entry;
193 if (call_info->call_kind() == CallInfo::itable_call) {
194 assert(bytecode == Bytecodes::_invokeinterface, "");
195 int itable_index = call_info->itable_index();
196 entry = VtableStubs::find_itable_stub(itable_index);
197 if (entry == false) {
198 return false;
199 }
200 #ifdef ASSERT
201 int index = call_info->resolved_method()->itable_index();
202 assert(index == itable_index, "CallInfo pre-computes this");
203 #endif //ASSERT
204 InstanceKlass* k = call_info->resolved_method()->method_holder();
205 assert(k->verify_itable_index(itable_index), "sanity check");
206 InlineCacheBuffer::create_transition_stub(this, k, entry);
207 } else {
208 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
209 // Can be different than selected_method->vtable_index(), due to package-private etc.
210 int vtable_index = call_info->vtable_index();
211 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
212 entry = VtableStubs::find_vtable_stub(vtable_index);
213 if (entry == NULL) {
214 return false;
215 }
216 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
217 }
218
219 if (TraceICs) {
220 ResourceMark rm;
221 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
222 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
223 }
224
225 // We can't check this anymore. With lazy deopt we could have already
226 // cleaned this IC entry before we even return. This is possible if
227 // we ran out of space in the inline cache buffer trying to do the
228 // set_next and we safepointed to free up space. This is a benign
229 // race because the IC entry was complete when we safepointed so
230 // cleaning it immediately is harmless.
231 // assert(is_megamorphic(), "sanity check");
232 return true;
233 }
234
235
236 // true if destination is megamorphic stub
237 bool CompiledIC::is_megamorphic() const {
238 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
239 assert(!is_optimized(), "an optimized call cannot be megamorphic");
240
241 // Cannot rely on cached_value. It is either an interface or a method.
242 return VtableStubs::is_entry_point(ic_destination());
243 }
244
245 bool CompiledIC::is_call_to_compiled() const {
246 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
247
248 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
249 // method is guaranteed to still exist, since we only remove methods after all inline caches
250 // has been cleaned up
251 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
252 bool is_monomorphic = (cb != NULL && cb->is_nmethod());
253 // Check that the cached_value is a klass for non-optimized monomorphic calls
254 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
255 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL)
256 #ifdef ASSERT
257 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
258 bool is_c1_method = caller->is_compiled_by_c1();
259 assert( is_c1_method ||
260 !is_monomorphic ||
261 is_optimized() ||
262 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
263 #endif // ASSERT
264 return is_monomorphic;
265 }
266
267
268 bool CompiledIC::is_call_to_interpreted() const {
269 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
270 // Call to interpreter if destination is either calling to a stub (if it
271 // is optimized), or calling to an I2C blob
272 bool is_call_to_interpreted = false;
273 if (!is_optimized()) {
274 // must use unsafe because the destination can be a zombie (and we're cleaning)
275 // and the print_compiled_ic code wants to know if site (in the non-zombie)
276 // is to the interpreter.
277 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
278 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
279 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
280 } else {
281 // Check if we are calling into our own codeblob (i.e., to a stub)
282 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
283 address dest = ic_destination();
284 #ifdef ASSERT
285 {
286 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
287 assert(!db->is_adapter_blob(), "must use stub!");
288 }
289 #endif /* ASSERT */
290 is_call_to_interpreted = cb->contains(dest);
291 }
292 return is_call_to_interpreted;
293 }
294
295
296 void CompiledIC::set_to_clean() {
297 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
298 if (TraceInlineCacheClearing || TraceICs) {
299 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
300 print();
301 }
302
303 address entry;
304 if (is_optimized()) {
305 entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
306 } else {
307 entry = SharedRuntime::get_resolve_virtual_call_stub();
308 }
309
310 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
311 // we only need to patch the destination
312 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
313
314 if (safe_transition) {
315 // Kill any leftover stub we might have too
316 if (is_in_transition_state()) {
317 ICStub* old_stub = ICStub_from_destination_address(stub_address());
318 old_stub->clear();
319 }
320 if (is_optimized()) {
321 set_ic_destination(entry);
322 } else {
323 set_ic_destination_and_value(entry, (void*)NULL);
324 }
325 } else {
326 // Unsafe transition - create stub.
327 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
328 }
329 // We can't check this anymore. With lazy deopt we could have already
330 // cleaned this IC entry before we even return. This is possible if
331 // we ran out of space in the inline cache buffer trying to do the
332 // set_next and we safepointed to free up space. This is a benign
333 // race because the IC entry was complete when we safepointed so
334 // cleaning it immediately is harmless.
335 // assert(is_clean(), "sanity check");
336 }
337
338
339 bool CompiledIC::is_clean() const {
340 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
341 bool is_clean = false;
342 address dest = ic_destination();
343 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
344 dest == SharedRuntime::get_resolve_virtual_call_stub();
345 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
346 return is_clean;
347 }
348
349
350 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
351 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
352 // Updating a cache to the wrong entry can cause bugs that are very hard
353 // to track down - if cache entry gets invalid - we just clean it. In
354 // this way it is always the same code path that is responsible for
355 // updating and resolving an inline cache
356 //
357 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
358 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
359 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
360 //
361 // In both of these cases the only thing being modifed is the jump/call target and these
362 // transitions are mt_safe
363
364 Thread *thread = Thread::current();
365 if (info.to_interpreter()) {
366 // Call to interpreter
367 if (info.is_optimized() && is_optimized()) {
368 assert(is_clean(), "unsafe IC path");
369 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
370 // the call analysis (callee structure) specifies that the call is optimized
371 // (either because of CHA or the static target is final)
372 // At code generation time, this call has been emitted as static call
373 // Call via stub
374 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
375 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
376 methodHandle method (thread, (Method*)info.cached_metadata());
377 csc->set_to_interpreted(method, info.entry());
378 if (TraceICs) {
379 ResourceMark rm(thread);
380 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
381 p2i(instruction_address()),
382 method->print_value_string());
383 }
384 } else {
385 // Call via method-klass-holder
386 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
387 if (TraceICs) {
388 ResourceMark rm(thread);
389 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
390 }
391 }
392 } else {
393 // Call to compiled code
394 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
395 #ifdef ASSERT
396 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
397 assert (cb->is_nmethod(), "must be compiled!");
398 #endif /* ASSERT */
399
400 // This is MT safe if we come from a clean-cache and go through a
401 // non-verified entry point
402 bool safe = SafepointSynchronize::is_at_safepoint() ||
403 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
404
405 if (!safe) {
406 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
407 } else {
408 if (is_optimized()) {
409 set_ic_destination(info.entry());
410 } else {
411 set_ic_destination_and_value(info.entry(), info.cached_metadata());
412 }
413 }
414
415 if (TraceICs) {
416 ResourceMark rm(thread);
417 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
418 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
419 p2i(instruction_address()),
420 ((Klass*)info.cached_metadata())->print_value_string(),
421 (safe) ? "" : "via stub");
422 }
423 }
424 // We can't check this anymore. With lazy deopt we could have already
425 // cleaned this IC entry before we even return. This is possible if
426 // we ran out of space in the inline cache buffer trying to do the
427 // set_next and we safepointed to free up space. This is a benign
428 // race because the IC entry was complete when we safepointed so
429 // cleaning it immediately is harmless.
430 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
431 }
432
433
434 // is_optimized: Compiler has generated an optimized call (i.e., no inline
435 // cache) static_bound: The call can be static bound (i.e, no need to use
436 // inline cache)
437 void CompiledIC::compute_monomorphic_entry(methodHandle method,
438 KlassHandle receiver_klass,
439 bool is_optimized,
440 bool static_bound,
441 CompiledICInfo& info,
442 TRAPS) {
443 nmethod* method_code = method->code();
444 address entry = NULL;
445 if (method_code != NULL && method_code->is_in_use()) {
446 // Call to compiled code
447 if (static_bound || is_optimized) {
448 entry = method_code->verified_entry_point();
449 } else {
450 entry = method_code->entry_point();
451 }
452 }
453 if (entry != NULL) {
454 // Call to compiled code
455 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
456 } else {
457 // Note: the following problem exists with Compiler1:
458 // - at compile time we may or may not know if the destination is final
459 // - if we know that the destination is final, we will emit an optimized
460 // virtual call (no inline cache), and need a Method* to make a call
461 // to the interpreter
462 // - if we do not know if the destination is final, we emit a standard
463 // virtual call, and use CompiledICHolder to call interpreted code
464 // (no static call stub has been generated)
465 // However in that case we will now notice it is static_bound
466 // and convert the call into what looks to be an optimized
467 // virtual call. This causes problems in verifying the IC because
468 // it look vanilla but is optimized. Code in is_call_to_interpreted
469 // is aware of this and weakens its asserts.
470
471 // static_bound should imply is_optimized -- otherwise we have a
472 // performance bug (statically-bindable method is called via
473 // dynamically-dispatched call note: the reverse implication isn't
474 // necessarily true -- the call may have been optimized based on compiler
475 // analysis (static_bound is only based on "final" etc.)
476 #ifdef COMPILER2
477 #ifdef TIERED
478 #if defined(ASSERT)
479 // can't check the assert because we don't have the CompiledIC with which to
480 // find the address if the call instruction.
481 //
482 // CodeBlob* cb = find_blob_unsafe(instruction_address());
483 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
484 #endif // ASSERT
485 #else
486 assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
487 #endif // TIERED
488 #endif // COMPILER2
489 if (is_optimized) {
490 // Use stub entry
491 info.set_interpreter_entry(method()->get_c2i_entry(), method());
492 } else {
493 // Use icholder entry
494 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
495 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
496 }
497 }
498 assert(info.is_optimized() == is_optimized, "must agree");
499 }
500
501
502 bool CompiledIC::is_icholder_entry(address entry) {
503 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
504 return (cb != NULL && cb->is_adapter_blob());
505 }
506
507 // ----------------------------------------------------------------------------
508
509 void CompiledStaticCall::set_to_clean() {
510 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
511 // Reset call site
512 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
513 #ifdef ASSERT
514 CodeBlob* cb = CodeCache::find_blob_unsafe(this);
515 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
516 #endif
517 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
518
519 // Do not reset stub here: It is too expensive to call find_stub.
520 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
521 // both the call and its stub.
522 }
523
524
525 bool CompiledStaticCall::is_clean() const {
526 return destination() == SharedRuntime::get_resolve_static_call_stub();
527 }
528
529 bool CompiledStaticCall::is_call_to_compiled() const {
530 return CodeCache::contains(destination());
531 }
532
533
534 bool CompiledStaticCall::is_call_to_interpreted() const {
535 // It is a call to interpreted, if it calls to a stub. Hence, the destination
536 // must be in the stub part of the nmethod that contains the call
537 nmethod* nm = CodeCache::find_nmethod(instruction_address());
538 return nm->stub_contains(destination());
539 }
540
541 void CompiledStaticCall::set(const StaticCallInfo& info) {
542 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
543 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
544 // Updating a cache to the wrong entry can cause bugs that are very hard
545 // to track down - if cache entry gets invalid - we just clean it. In
546 // this way it is always the same code path that is responsible for
547 // updating and resolving an inline cache
548 assert(is_clean(), "do not update a call entry - use clean");
549
550 if (info._to_interpreter) {
551 // Call to interpreted code
552 set_to_interpreted(info.callee(), info.entry());
553 } else {
554 if (TraceICs) {
555 ResourceMark rm;
556 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
557 p2i(instruction_address()),
558 p2i(info.entry()));
559 }
560 // Call to compiled code
561 assert (CodeCache::contains(info.entry()), "wrong entry point");
562 set_destination_mt_safe(info.entry());
563 }
564 }
565
566
567 // Compute settings for a CompiledStaticCall. Since we might have to set
568 // the stub when calling to the interpreter, we need to return arguments.
569 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
570 nmethod* m_code = m->code();
571 info._callee = m;
572 if (m_code != NULL && m_code->is_in_use()) {
573 info._to_interpreter = false;
574 info._entry = m_code->verified_entry_point();
575 } else {
576 // Callee is interpreted code. In any case entering the interpreter
577 // puts a converter-frame on the stack to save arguments.
578 info._to_interpreter = true;
579 info._entry = m()->get_c2i_entry();
580 }
581 }
582
583 address CompiledStaticCall::find_stub() {
584 // Find reloc. information containing this call-site
585 RelocIterator iter((nmethod*)NULL, instruction_address());
586 while (iter.next()) {
587 if (iter.addr() == instruction_address()) {
588 switch(iter.type()) {
589 case relocInfo::static_call_type:
590 return iter.static_call_reloc()->static_stub();
591 // We check here for opt_virtual_call_type, since we reuse the code
592 // from the CompiledIC implementation
593 case relocInfo::opt_virtual_call_type:
594 return iter.opt_virtual_call_reloc()->static_stub();
595 case relocInfo::poll_type:
596 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
597 default:
598 ShouldNotReachHere();
599 }
600 }
601 }
602 return NULL;
603 }
604
605
606 //-----------------------------------------------------------------------------
607 // Non-product mode code
608 #ifndef PRODUCT
609
610 void CompiledIC::verify() {
611 // make sure code pattern is actually a call imm32 instruction
612 _ic_call->verify();
613 if (os::is_MP()) {
614 _ic_call->verify_alignment();
615 }
616 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
617 || is_optimized() || is_megamorphic(), "sanity check");
618 }
619
620 void CompiledIC::print() {
621 print_compiled_ic();
622 tty->cr();
623 }
624
625 void CompiledIC::print_compiled_ic() {
626 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
627 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
628 }
629
630 void CompiledStaticCall::print() {
631 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
632 if (is_clean()) {
633 tty->print("clean");
634 } else if (is_call_to_compiled()) {
635 tty->print("compiled");
636 } else if (is_call_to_interpreted()) {
637 tty->print("interpreted");
638 }
639 tty->cr();
640 }
641
642 #endif // !PRODUCT