Sat, 01 Sep 2012 13:25:18 -0400
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
1 /*
2 * Copyright (c) 1997, 2012, 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.
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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.
49 // Release the CompiledICHolder* associated with this call site is there is one.
50 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
51 // This call site might have become stale so inspect it carefully.
52 NativeCall* call = nativeCall_at(call_site->addr());
53 if (is_icholder_entry(call->destination())) {
54 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
55 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
56 }
57 }
60 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
61 // This call site might have become stale so inspect it carefully.
62 NativeCall* call = nativeCall_at(call_site->addr());
63 return is_icholder_entry(call->destination());
64 }
67 //-----------------------------------------------------------------------------
68 // Low-level access to an inline cache. Private, since they might not be
69 // MT-safe to use.
71 void* CompiledIC::cached_value() const {
72 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
73 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
75 if (!is_in_transition_state()) {
76 void* data = (void*)_value->data();
77 // If we let the metadata value here be initialized to zero...
78 assert(data != NULL || Universe::non_oop_word() == NULL,
79 "no raw nulls in CompiledIC metadatas, because of patching races");
80 return (data == (void*)Universe::non_oop_word()) ? NULL : data;
81 } else {
82 return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
83 }
84 }
87 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
88 assert(entry_point != NULL, "must set legal entry point");
89 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
90 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
91 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
93 assert(!is_icholder || is_icholder_entry(entry_point), "must be");
95 // Don't use ic_destination for this test since that forwards
96 // through ICBuffer instead of returning the actual current state of
97 // the CompiledIC.
98 if (is_icholder_entry(_ic_call->destination())) {
99 // When patching for the ICStub case the cached value isn't
100 // overwritten until the ICStub copied into the CompiledIC during
101 // the next safepoint. Make sure that the CompiledICHolder* is
102 // marked for release at this point since it won't be identifiable
103 // once the entry point is overwritten.
104 InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data());
105 }
107 if (TraceCompiledIC) {
108 tty->print(" ");
109 print_compiled_ic();
110 tty->print(" changing destination to " INTPTR_FORMAT, entry_point);
111 if (!is_optimized()) {
112 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", (address)cache);
113 }
114 if (is_icstub) {
115 tty->print(" (icstub)");
116 }
117 tty->cr();
118 }
120 {
121 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
122 #ifdef ASSERT
123 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
124 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
125 #endif
126 _ic_call->set_destination_mt_safe(entry_point);
127 }
129 if (is_optimized() || is_icstub) {
130 // Optimized call sites don't have a cache value and ICStub call
131 // sites only change the entry point. Changing the value in that
132 // case could lead to MT safety issues.
133 assert(cache == NULL, "must be null");
134 return;
135 }
137 if (cache == NULL) cache = (void*)Universe::non_oop_word();
139 _value->set_data((intptr_t)cache);
140 }
143 void CompiledIC::set_ic_destination(ICStub* stub) {
144 internal_set_ic_destination(stub->code_begin(), true, NULL, false);
145 }
149 address CompiledIC::ic_destination() const {
150 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
151 if (!is_in_transition_state()) {
152 return _ic_call->destination();
153 } else {
154 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
155 }
156 }
159 bool CompiledIC::is_in_transition_state() const {
160 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
161 return InlineCacheBuffer::contains(_ic_call->destination());
162 }
165 bool CompiledIC::is_icholder_call() const {
166 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
167 return !_is_optimized && is_icholder_entry(ic_destination());
168 }
170 // Returns native address of 'call' instruction in inline-cache. Used by
171 // the InlineCacheBuffer when it needs to find the stub.
172 address CompiledIC::stub_address() const {
173 assert(is_in_transition_state(), "should only be called when we are in a transition state");
174 return _ic_call->destination();
175 }
178 //-----------------------------------------------------------------------------
179 // High-level access to an inline cache. Guaranteed to be MT-safe.
182 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
183 methodHandle method = call_info->selected_method();
184 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index());
185 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
186 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
187 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
189 address entry;
190 if (is_invoke_interface) {
191 int index = klassItable::compute_itable_index(call_info->resolved_method()());
192 entry = VtableStubs::create_stub(false, index, method());
193 assert(entry != NULL, "entry not computed");
194 Klass* k = call_info->resolved_method()->method_holder();
195 assert(Klass::cast(k)->is_interface(), "sanity check");
196 InlineCacheBuffer::create_transition_stub(this, k, entry);
197 } else {
198 // Can be different than method->vtable_index(), due to package-private etc.
199 int vtable_index = call_info->vtable_index();
200 entry = VtableStubs::create_stub(true, vtable_index, method());
201 InlineCacheBuffer::create_transition_stub(this, method(), entry);
202 }
204 if (TraceICs) {
205 ResourceMark rm;
206 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
207 instruction_address(), method->print_value_string(), entry);
208 }
210 // We can't check this anymore. With lazy deopt we could have already
211 // cleaned this IC entry before we even return. This is possible if
212 // we ran out of space in the inline cache buffer trying to do the
213 // set_next and we safepointed to free up space. This is a benign
214 // race because the IC entry was complete when we safepointed so
215 // cleaning it immediately is harmless.
216 // assert(is_megamorphic(), "sanity check");
217 }
220 // true if destination is megamorphic stub
221 bool CompiledIC::is_megamorphic() const {
222 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
223 assert(!is_optimized(), "an optimized call cannot be megamorphic");
225 // Cannot rely on cached_value. It is either an interface or a method.
226 return VtableStubs::is_entry_point(ic_destination());
227 }
229 bool CompiledIC::is_call_to_compiled() const {
230 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
232 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
233 // method is guaranteed to still exist, since we only remove methods after all inline caches
234 // has been cleaned up
235 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
236 bool is_monomorphic = (cb != NULL && cb->is_nmethod());
237 // Check that the cached_value is a klass for non-optimized monomorphic calls
238 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
239 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL)
240 #ifdef ASSERT
241 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
242 bool is_c1_method = caller->is_compiled_by_c1();
243 assert( is_c1_method ||
244 !is_monomorphic ||
245 is_optimized() ||
246 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
247 #endif // ASSERT
248 return is_monomorphic;
249 }
252 bool CompiledIC::is_call_to_interpreted() const {
253 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
254 // Call to interpreter if destination is either calling to a stub (if it
255 // is optimized), or calling to an I2C blob
256 bool is_call_to_interpreted = false;
257 if (!is_optimized()) {
258 // must use unsafe because the destination can be a zombie (and we're cleaning)
259 // and the print_compiled_ic code wants to know if site (in the non-zombie)
260 // is to the interpreter.
261 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
262 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
263 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
264 } else {
265 // Check if we are calling into our own codeblob (i.e., to a stub)
266 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
267 address dest = ic_destination();
268 #ifdef ASSERT
269 {
270 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
271 assert(!db->is_adapter_blob(), "must use stub!");
272 }
273 #endif /* ASSERT */
274 is_call_to_interpreted = cb->contains(dest);
275 }
276 return is_call_to_interpreted;
277 }
280 void CompiledIC::set_to_clean() {
281 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
282 if (TraceInlineCacheClearing || TraceICs) {
283 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address());
284 print();
285 }
287 address entry;
288 if (is_optimized()) {
289 entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
290 } else {
291 entry = SharedRuntime::get_resolve_virtual_call_stub();
292 }
294 // A zombie transition will always be safe, since the metadata has already been set to NULL, so
295 // we only need to patch the destination
296 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
298 if (safe_transition) {
299 // Kill any leftover stub we might have too
300 if (is_in_transition_state()) {
301 ICStub* old_stub = ICStub_from_destination_address(stub_address());
302 old_stub->clear();
303 }
304 if (is_optimized()) {
305 set_ic_destination(entry);
306 } else {
307 set_ic_destination_and_value(entry, (void*)NULL);
308 }
309 } else {
310 // Unsafe transition - create stub.
311 InlineCacheBuffer::create_transition_stub(this, NULL, entry);
312 }
313 // We can't check this anymore. With lazy deopt we could have already
314 // cleaned this IC entry before we even return. This is possible if
315 // we ran out of space in the inline cache buffer trying to do the
316 // set_next and we safepointed to free up space. This is a benign
317 // race because the IC entry was complete when we safepointed so
318 // cleaning it immediately is harmless.
319 // assert(is_clean(), "sanity check");
320 }
323 bool CompiledIC::is_clean() const {
324 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
325 bool is_clean = false;
326 address dest = ic_destination();
327 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
328 dest == SharedRuntime::get_resolve_virtual_call_stub();
329 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
330 return is_clean;
331 }
334 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
335 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
336 // Updating a cache to the wrong entry can cause bugs that are very hard
337 // to track down - if cache entry gets invalid - we just clean it. In
338 // this way it is always the same code path that is responsible for
339 // updating and resolving an inline cache
340 //
341 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
342 // callsites. In addition ic_miss code will update a site to monomorphic if it determines
343 // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
344 //
345 // In both of these cases the only thing being modifed is the jump/call target and these
346 // transitions are mt_safe
348 Thread *thread = Thread::current();
349 if (info.to_interpreter()) {
350 // Call to interpreter
351 if (info.is_optimized() && is_optimized()) {
352 assert(is_clean(), "unsafe IC path");
353 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
354 // the call analysis (callee structure) specifies that the call is optimized
355 // (either because of CHA or the static target is final)
356 // At code generation time, this call has been emitted as static call
357 // Call via stub
358 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
359 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
360 methodHandle method (thread, (Method*)info.cached_metadata());
361 csc->set_to_interpreted(method, info.entry());
362 if (TraceICs) {
363 ResourceMark rm(thread);
364 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
365 instruction_address(),
366 method->print_value_string());
367 }
368 } else {
369 // Call via method-klass-holder
370 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
371 if (TraceICs) {
372 ResourceMark rm(thread);
373 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address());
374 }
375 }
376 } else {
377 // Call to compiled code
378 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
379 #ifdef ASSERT
380 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
381 assert (cb->is_nmethod(), "must be compiled!");
382 #endif /* ASSERT */
384 // This is MT safe if we come from a clean-cache and go through a
385 // non-verified entry point
386 bool safe = SafepointSynchronize::is_at_safepoint() ||
387 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
389 if (!safe) {
390 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
391 } else {
392 if (is_optimized()) {
393 set_ic_destination(info.entry());
394 } else {
395 set_ic_destination_and_value(info.entry(), info.cached_metadata());
396 }
397 }
399 if (TraceICs) {
400 ResourceMark rm(thread);
401 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
402 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
403 instruction_address(),
404 ((Klass*)info.cached_metadata())->print_value_string(),
405 (safe) ? "" : "via stub");
406 }
407 }
408 // We can't check this anymore. With lazy deopt we could have already
409 // cleaned this IC entry before we even return. This is possible if
410 // we ran out of space in the inline cache buffer trying to do the
411 // set_next and we safepointed to free up space. This is a benign
412 // race because the IC entry was complete when we safepointed so
413 // cleaning it immediately is harmless.
414 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
415 }
418 // is_optimized: Compiler has generated an optimized call (i.e., no inline
419 // cache) static_bound: The call can be static bound (i.e, no need to use
420 // inline cache)
421 void CompiledIC::compute_monomorphic_entry(methodHandle method,
422 KlassHandle receiver_klass,
423 bool is_optimized,
424 bool static_bound,
425 CompiledICInfo& info,
426 TRAPS) {
427 nmethod* method_code = method->code();
428 address entry = NULL;
429 if (method_code != NULL) {
430 // Call to compiled code
431 if (static_bound || is_optimized) {
432 entry = method_code->verified_entry_point();
433 } else {
434 entry = method_code->entry_point();
435 }
436 }
437 if (entry != NULL) {
438 // Call to compiled code
439 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
440 } else {
441 // Note: the following problem exists with Compiler1:
442 // - at compile time we may or may not know if the destination is final
443 // - if we know that the destination is final, we will emit an optimized
444 // virtual call (no inline cache), and need a Method* to make a call
445 // to the interpreter
446 // - if we do not know if the destination is final, we emit a standard
447 // virtual call, and use CompiledICHolder to call interpreted code
448 // (no static call stub has been generated)
449 // However in that case we will now notice it is static_bound
450 // and convert the call into what looks to be an optimized
451 // virtual call. This causes problems in verifying the IC because
452 // it look vanilla but is optimized. Code in is_call_to_interpreted
453 // is aware of this and weakens its asserts.
455 // static_bound should imply is_optimized -- otherwise we have a
456 // performance bug (statically-bindable method is called via
457 // dynamically-dispatched call note: the reverse implication isn't
458 // necessarily true -- the call may have been optimized based on compiler
459 // analysis (static_bound is only based on "final" etc.)
460 #ifdef COMPILER2
461 #ifdef TIERED
462 #if defined(ASSERT)
463 // can't check the assert because we don't have the CompiledIC with which to
464 // find the address if the call instruction.
465 //
466 // CodeBlob* cb = find_blob_unsafe(instruction_address());
467 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
468 #endif // ASSERT
469 #else
470 assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
471 #endif // TIERED
472 #endif // COMPILER2
473 if (is_optimized) {
474 // Use stub entry
475 info.set_interpreter_entry(method()->get_c2i_entry(), method());
476 } else {
477 // Use icholder entry
478 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
479 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
480 }
481 }
482 assert(info.is_optimized() == is_optimized, "must agree");
483 }
486 bool CompiledIC::is_icholder_entry(address entry) {
487 CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
488 return (cb != NULL && cb->is_adapter_blob());
489 }
492 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
493 : _ic_call(call)
494 {
495 address ic_call = call->instruction_address();
497 assert(ic_call != NULL, "ic_call address must be set");
498 assert(nm != NULL, "must pass nmethod");
499 assert(nm->contains(ic_call), "must be in nmethod");
501 // search for the ic_call at the given address
502 RelocIterator iter(nm, ic_call, ic_call+1);
503 bool ret = iter.next();
504 assert(ret == true, "relocInfo must exist at this address");
505 assert(iter.addr() == ic_call, "must find ic_call");
506 if (iter.type() == relocInfo::virtual_call_type) {
507 virtual_call_Relocation* r = iter.virtual_call_reloc();
508 _is_optimized = false;
509 _value = nativeMovConstReg_at(r->cached_value());
510 } else {
511 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
512 _is_optimized = true;
513 _value = NULL;
514 }
515 }
518 // ----------------------------------------------------------------------------
520 void CompiledStaticCall::set_to_clean() {
521 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
522 // Reset call site
523 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
524 #ifdef ASSERT
525 CodeBlob* cb = CodeCache::find_blob_unsafe(this);
526 assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
527 #endif
528 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
530 // Do not reset stub here: It is too expensive to call find_stub.
531 // Instead, rely on caller (nmethod::clear_inline_caches) to clear
532 // both the call and its stub.
533 }
536 bool CompiledStaticCall::is_clean() const {
537 return destination() == SharedRuntime::get_resolve_static_call_stub();
538 }
540 bool CompiledStaticCall::is_call_to_compiled() const {
541 return CodeCache::contains(destination());
542 }
545 bool CompiledStaticCall::is_call_to_interpreted() const {
546 // It is a call to interpreted, if it calls to a stub. Hence, the destination
547 // must be in the stub part of the nmethod that contains the call
548 nmethod* nm = CodeCache::find_nmethod(instruction_address());
549 return nm->stub_contains(destination());
550 }
553 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
554 address stub=find_stub();
555 assert(stub!=NULL, "stub not found");
557 if (TraceICs) {
558 ResourceMark rm;
559 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
560 instruction_address(),
561 callee->name_and_sig_as_C_string());
562 }
564 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
565 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
567 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache");
568 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache");
570 // Update stub
571 method_holder->set_data((intptr_t)callee());
572 jump->set_jump_destination(entry);
574 // Update jump to call
575 set_destination_mt_safe(stub);
576 }
579 void CompiledStaticCall::set(const StaticCallInfo& info) {
580 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
581 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
582 // Updating a cache to the wrong entry can cause bugs that are very hard
583 // to track down - if cache entry gets invalid - we just clean it. In
584 // this way it is always the same code path that is responsible for
585 // updating and resolving an inline cache
586 assert(is_clean(), "do not update a call entry - use clean");
588 if (info._to_interpreter) {
589 // Call to interpreted code
590 set_to_interpreted(info.callee(), info.entry());
591 } else {
592 if (TraceICs) {
593 ResourceMark rm;
594 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
595 instruction_address(),
596 info.entry());
597 }
598 // Call to compiled code
599 assert (CodeCache::contains(info.entry()), "wrong entry point");
600 set_destination_mt_safe(info.entry());
601 }
602 }
605 // Compute settings for a CompiledStaticCall. Since we might have to set
606 // the stub when calling to the interpreter, we need to return arguments.
607 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
608 nmethod* m_code = m->code();
609 info._callee = m;
610 if (m_code != NULL) {
611 info._to_interpreter = false;
612 info._entry = m_code->verified_entry_point();
613 } else {
614 // Callee is interpreted code. In any case entering the interpreter
615 // puts a converter-frame on the stack to save arguments.
616 info._to_interpreter = true;
617 info._entry = m()->get_c2i_entry();
618 }
619 }
622 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
623 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
624 // Reset stub
625 address stub = static_stub->addr();
626 assert(stub!=NULL, "stub not found");
627 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
628 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
629 method_holder->set_data(0);
630 jump->set_jump_destination((address)-1);
631 }
634 address CompiledStaticCall::find_stub() {
635 // Find reloc. information containing this call-site
636 RelocIterator iter((nmethod*)NULL, instruction_address());
637 while (iter.next()) {
638 if (iter.addr() == instruction_address()) {
639 switch(iter.type()) {
640 case relocInfo::static_call_type:
641 return iter.static_call_reloc()->static_stub();
642 // We check here for opt_virtual_call_type, since we reuse the code
643 // from the CompiledIC implementation
644 case relocInfo::opt_virtual_call_type:
645 return iter.opt_virtual_call_reloc()->static_stub();
646 case relocInfo::poll_type:
647 case relocInfo::poll_return_type: // A safepoint can't overlap a call.
648 default:
649 ShouldNotReachHere();
650 }
651 }
652 }
653 return NULL;
654 }
657 //-----------------------------------------------------------------------------
658 // Non-product mode code
659 #ifndef PRODUCT
661 void CompiledIC::verify() {
662 // make sure code pattern is actually a call imm32 instruction
663 _ic_call->verify();
664 if (os::is_MP()) {
665 _ic_call->verify_alignment();
666 }
667 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
668 || is_optimized() || is_megamorphic(), "sanity check");
669 }
672 void CompiledIC::print() {
673 print_compiled_ic();
674 tty->cr();
675 }
678 void CompiledIC::print_compiled_ic() {
679 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
680 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value());
681 }
684 void CompiledStaticCall::print() {
685 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address());
686 if (is_clean()) {
687 tty->print("clean");
688 } else if (is_call_to_compiled()) {
689 tty->print("compiled");
690 } else if (is_call_to_interpreted()) {
691 tty->print("interpreted");
692 }
693 tty->cr();
694 }
696 void CompiledStaticCall::verify() {
697 // Verify call
698 NativeCall::verify();
699 if (os::is_MP()) {
700 verify_alignment();
701 }
703 // Verify stub
704 address stub = find_stub();
705 assert(stub != NULL, "no stub found for static call");
706 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
707 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
709 // Verify state
710 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
711 }
713 #endif