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(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 } 157 158 159 //----------------------------------------------------------------------------- 160 // High-level access to an inline cache. Guaranteed to be MT-safe. 161 162 void CompiledIC::initialize_from_iter(RelocIterator* iter) { 163 assert(iter->addr() == _ic_call->instruction_address(), "must find ic_call"); 164 165 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 } 175 176 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) 177 : _ic_call(call) 178 { 179 address ic_call = _ic_call->instruction_address(); 180 181 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"); 184 185 // 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"); 190 191 initialize_from_iter(&iter); 192 } 193 194 CompiledIC::CompiledIC(RelocIterator* iter) 195 : _ic_call(nativeCall_at(iter->addr())) 196 { 197 address ic_call = _ic_call->instruction_address(); 198 199 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"); 203 204 initialize_from_iter(iter); 205 } 206 207 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?"); 211 212 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 } 238 239 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 } 244 245 // 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 } 254 255 256 // 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"); 260 261 // Cannot rely on cached_value. It is either an interface or a method. 262 return VtableStubs::is_entry_point(ic_destination()); 263 } 264 265 bool CompiledIC::is_call_to_compiled() const { 266 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 267 268 // 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 } 286 287 288 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 } 314 315 316 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 } 322 323 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 } 329 330 // 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(); 333 334 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 } 357 358 359 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 } 368 369 370 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 383 384 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 */ 419 420 // 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())); 424 425 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 } 434 435 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 } 452 453 454 // 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. 490 491 // 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 } 520 521 522 bool CompiledIC::is_icholder_entry(address entry) { 523 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); 524 return (cb != NULL && cb->is_adapter_blob()); 525 } 526 527 // ---------------------------------------------------------------------------- 528 529 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()); 538 539 // 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 } 543 544 545 bool CompiledStaticCall::is_clean() const { 546 return destination() == SharedRuntime::get_resolve_static_call_stub(); 547 } 548 549 bool CompiledStaticCall::is_call_to_compiled() const { 550 return CodeCache::contains(destination()); 551 } 552 553 554 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 } 560 561 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"); 569 570 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 } 585 586 587 // 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 } 602 603 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 } 624 625 626 //----------------------------------------------------------------------------- 627 // Non-product mode code 628 #ifndef PRODUCT 629 630 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 } 639 640 void CompiledIC::print() { 641 print_compiled_ic(); 642 tty->cr(); 643 } 644 645 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 } 649 650 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 } 661 662 #endif // !PRODUCT