1 /* 2 * Copyright (c) 1997, 2018, 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 "memory/resourceArea.hpp" 37 #include "oops/method.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/symbol.hpp" 40 #include "runtime/handles.inline.hpp" 41 #include "runtime/icache.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/stubRoutines.hpp" 44 #include "utilities/events.hpp" 45 46 47 // Every time a compiled IC is changed or its type is being accessed, 48 // either the CompiledIC_lock must be set or we must be at a safe point. 49 50 //----------------------------------------------------------------------------- 51 // Low-level access to an inline cache. Private, since they might not be 52 // MT-safe to use. 53 54 void* CompiledIC::cached_value() const { 55 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 56 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); 57 58 if (!is_in_transition_state()) { 59 void* data = get_data(); 60 // If we let the metadata value here be initialized to zero... 61 assert(data != NULL || Universe::non_oop_word() == NULL, 62 "no raw nulls in CompiledIC metadatas, because of patching races"); 63 return (data == (void*)Universe::non_oop_word()) ? NULL : data; 64 } else { 65 return InlineCacheBuffer::cached_value_for((CompiledIC *)this); 66 } 67 } 68 69 70 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { 71 assert(entry_point != NULL, "must set legal entry point"); 72 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 73 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); 74 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); 75 76 assert(!is_icholder || is_icholder_entry(entry_point), "must be"); 77 78 // Don't use ic_destination for this test since that forwards 79 // through ICBuffer instead of returning the actual current state of 80 // the CompiledIC. 81 if (is_icholder_entry(_call->destination())) { 82 // When patching for the ICStub case the cached value isn't 83 // overwritten until the ICStub copied into the CompiledIC during 84 // the next safepoint. Make sure that the CompiledICHolder* is 85 // marked for release at this point since it won't be identifiable 86 // once the entry point is overwritten. 87 InlineCacheBuffer::queue_for_release((CompiledICHolder*)get_data()); 88 } 89 90 if (TraceCompiledIC) { 91 tty->print(" "); 92 print_compiled_ic(); 93 tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point)); 94 if (!is_optimized()) { 95 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache)); 96 } 97 if (is_icstub) { 98 tty->print(" (icstub)"); 99 } 100 tty->cr(); 101 } 102 103 { 104 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); 105 #ifdef ASSERT 106 CodeBlob* cb = CodeCache::find_blob_unsafe(_call->instruction_address()); 107 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 108 #endif 109 _call->set_destination_mt_safe(entry_point); 110 } 111 112 if (is_optimized() || is_icstub) { 113 // Optimized call sites don't have a cache value and ICStub call 114 // sites only change the entry point. Changing the value in that 115 // case could lead to MT safety issues. 116 assert(cache == NULL, "must be null"); 117 return; 118 } 119 120 if (cache == NULL) cache = (void*)Universe::non_oop_word(); 121 122 set_data((intptr_t)cache); 123 } 124 125 126 void CompiledIC::set_ic_destination(ICStub* stub) { 127 internal_set_ic_destination(stub->code_begin(), true, NULL, false); 128 } 129 130 131 132 address CompiledIC::ic_destination() const { 133 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 134 if (!is_in_transition_state()) { 135 return _call->destination(); 136 } else { 137 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); 138 } 139 } 140 141 142 bool CompiledIC::is_in_transition_state() const { 143 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 144 return InlineCacheBuffer::contains(_call->destination());; 145 } 146 147 148 bool CompiledIC::is_icholder_call() const { 149 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 150 return !_is_optimized && is_icholder_entry(ic_destination()); 151 } 152 153 // Returns native address of 'call' instruction in inline-cache. Used by 154 // the InlineCacheBuffer when it needs to find the stub. 155 address CompiledIC::stub_address() const { 156 assert(is_in_transition_state(), "should only be called when we are in a transition state"); 157 return _call->destination(); 158 } 159 160 // Clears the IC stub if the compiled IC is in transition state 161 void CompiledIC::clear_ic_stub() { 162 if (is_in_transition_state()) { 163 ICStub* stub = ICStub_from_destination_address(stub_address()); 164 stub->clear(); 165 } 166 } 167 168 //----------------------------------------------------------------------------- 169 // High-level access to an inline cache. Guaranteed to be MT-safe. 170 171 void CompiledIC::initialize_from_iter(RelocIterator* iter) { 172 assert(iter->addr() == _call->instruction_address(), "must find ic_call"); 173 174 if (iter->type() == relocInfo::virtual_call_type) { 175 virtual_call_Relocation* r = iter->virtual_call_reloc(); 176 _is_optimized = false; 177 _value = _call->get_load_instruction(r); 178 } else { 179 assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); 180 _is_optimized = true; 181 _value = NULL; 182 } 183 } 184 185 CompiledIC::CompiledIC(CompiledMethod* cm, NativeCall* call) 186 : _method(cm) 187 { 188 _call = _method->call_wrapper_at((address) call); 189 address ic_call = _call->instruction_address(); 190 191 assert(ic_call != NULL, "ic_call address must be set"); 192 assert(cm != NULL, "must pass compiled method"); 193 assert(cm->contains(ic_call), "must be in compiled method"); 194 195 // Search for the ic_call at the given address. 196 RelocIterator iter(cm, ic_call, ic_call+1); 197 bool ret = iter.next(); 198 assert(ret == true, "relocInfo must exist at this address"); 199 assert(iter.addr() == ic_call, "must find ic_call"); 200 201 initialize_from_iter(&iter); 202 } 203 204 CompiledIC::CompiledIC(RelocIterator* iter) 205 : _method(iter->code()) 206 { 207 _call = _method->call_wrapper_at(iter->addr()); 208 address ic_call = _call->instruction_address(); 209 210 CompiledMethod* nm = iter->code(); 211 assert(ic_call != NULL, "ic_call address must be set"); 212 assert(nm != NULL, "must pass compiled method"); 213 assert(nm->contains(ic_call), "must be in compiled method"); 214 215 initialize_from_iter(iter); 216 } 217 218 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { 219 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 220 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); 221 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); 222 223 address entry; 224 if (call_info->call_kind() == CallInfo::itable_call) { 225 assert(bytecode == Bytecodes::_invokeinterface, ""); 226 int itable_index = call_info->itable_index(); 227 entry = VtableStubs::find_itable_stub(itable_index); 228 if (entry == NULL) { 229 return false; 230 } 231 #ifdef ASSERT 232 int index = call_info->resolved_method()->itable_index(); 233 assert(index == itable_index, "CallInfo pre-computes this"); 234 InstanceKlass* k = call_info->resolved_method()->method_holder(); 235 assert(k->verify_itable_index(itable_index), "sanity check"); 236 #endif //ASSERT 237 CompiledICHolder* holder = new CompiledICHolder(call_info->resolved_method()->method_holder(), 238 call_info->resolved_klass()); 239 holder->claim(); 240 InlineCacheBuffer::create_transition_stub(this, holder, entry); 241 } else { 242 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); 243 // Can be different than selected_method->vtable_index(), due to package-private etc. 244 int vtable_index = call_info->vtable_index(); 245 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); 246 entry = VtableStubs::find_vtable_stub(vtable_index); 247 if (entry == NULL) { 248 return false; 249 } 250 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 251 } 252 253 if (TraceICs) { 254 ResourceMark rm; 255 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, 256 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry)); 257 } 258 259 // We can't check this anymore. With lazy deopt we could have already 260 // cleaned this IC entry before we even return. This is possible if 261 // we ran out of space in the inline cache buffer trying to do the 262 // set_next and we safepointed to free up space. This is a benign 263 // race because the IC entry was complete when we safepointed so 264 // cleaning it immediately is harmless. 265 // assert(is_megamorphic(), "sanity check"); 266 return true; 267 } 268 269 270 // true if destination is megamorphic stub 271 bool CompiledIC::is_megamorphic() const { 272 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 273 assert(!is_optimized(), "an optimized call cannot be megamorphic"); 274 275 // Cannot rely on cached_value. It is either an interface or a method. 276 return VtableStubs::is_entry_point(ic_destination()); 277 } 278 279 bool CompiledIC::is_call_to_compiled() const { 280 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 281 282 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie 283 // method is guaranteed to still exist, since we only remove methods after all inline caches 284 // has been cleaned up 285 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 286 bool is_monomorphic = (cb != NULL && cb->is_compiled()); 287 // Check that the cached_value is a klass for non-optimized monomorphic calls 288 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used 289 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL). 290 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized 291 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites. 292 #ifdef ASSERT 293 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); 294 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci(); 295 assert( is_c1_or_jvmci_method || 296 !is_monomorphic || 297 is_optimized() || 298 !caller->is_alive() || 299 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); 300 #endif // ASSERT 301 return is_monomorphic; 302 } 303 304 305 bool CompiledIC::is_call_to_interpreted() const { 306 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 307 // Call to interpreter if destination is either calling to a stub (if it 308 // is optimized), or calling to an I2C blob 309 bool is_call_to_interpreted = false; 310 if (!is_optimized()) { 311 // must use unsafe because the destination can be a zombie (and we're cleaning) 312 // and the print_compiled_ic code wants to know if site (in the non-zombie) 313 // is to the interpreter. 314 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 315 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); 316 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); 317 } else { 318 // Check if we are calling into our own codeblob (i.e., to a stub) 319 address dest = ic_destination(); 320 #ifdef ASSERT 321 { 322 _call->verify_resolve_call(dest); 323 } 324 #endif /* ASSERT */ 325 is_call_to_interpreted = _call->is_call_to_interpreted(dest); 326 } 327 return is_call_to_interpreted; 328 } 329 330 void CompiledIC::set_to_clean(bool in_use) { 331 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); 332 if (TraceInlineCacheClearing || TraceICs) { 333 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address())); 334 print(); 335 } 336 337 address entry = _call->get_resolve_call_stub(is_optimized()); 338 339 // A zombie transition will always be safe, since the metadata has already been set to NULL, so 340 // we only need to patch the destination 341 bool safe_transition = _call->is_safe_for_patching() || !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint(); 342 343 if (safe_transition) { 344 // Kill any leftover stub we might have too 345 clear_ic_stub(); 346 if (is_optimized()) { 347 set_ic_destination(entry); 348 } else { 349 set_ic_destination_and_value(entry, (void*)NULL); 350 } 351 } else { 352 // Unsafe transition - create stub. 353 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 354 } 355 // We can't check this anymore. With lazy deopt we could have already 356 // cleaned this IC entry before we even return. This is possible if 357 // we ran out of space in the inline cache buffer trying to do the 358 // set_next and we safepointed to free up space. This is a benign 359 // race because the IC entry was complete when we safepointed so 360 // cleaning it immediately is harmless. 361 // assert(is_clean(), "sanity check"); 362 } 363 364 bool CompiledIC::is_clean() const { 365 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 366 bool is_clean = false; 367 address dest = ic_destination(); 368 is_clean = dest == _call->get_resolve_call_stub(is_optimized()); 369 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); 370 return is_clean; 371 } 372 373 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { 374 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 375 // Updating a cache to the wrong entry can cause bugs that are very hard 376 // to track down - if cache entry gets invalid - we just clean it. In 377 // this way it is always the same code path that is responsible for 378 // updating and resolving an inline cache 379 // 380 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized 381 // callsites. In addition ic_miss code will update a site to monomorphic if it determines 382 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. 383 // 384 // In both of these cases the only thing being modifed is the jump/call target and these 385 // transitions are mt_safe 386 387 Thread *thread = Thread::current(); 388 if (info.to_interpreter() || info.to_aot()) { 389 // Call to interpreter 390 if (info.is_optimized() && is_optimized()) { 391 assert(is_clean(), "unsafe IC path"); 392 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 393 // the call analysis (callee structure) specifies that the call is optimized 394 // (either because of CHA or the static target is final) 395 // At code generation time, this call has been emitted as static call 396 // Call via stub 397 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); 398 methodHandle method (thread, (Method*)info.cached_metadata()); 399 _call->set_to_interpreted(method, info); 400 401 if (TraceICs) { 402 ResourceMark rm(thread); 403 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to %s: %s", 404 p2i(instruction_address()), 405 (info.to_aot() ? "aot" : "interpreter"), 406 method->print_value_string()); 407 } 408 } else { 409 // Call via method-klass-holder 410 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); 411 if (TraceICs) { 412 ResourceMark rm(thread); 413 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address())); 414 } 415 } 416 } else { 417 // Call to compiled code 418 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); 419 #ifdef ASSERT 420 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); 421 assert (cb != NULL && cb->is_compiled(), "must be compiled!"); 422 #endif /* ASSERT */ 423 424 // This is MT safe if we come from a clean-cache and go through a 425 // non-verified entry point 426 bool safe = SafepointSynchronize::is_at_safepoint() || 427 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); 428 429 if (!safe) { 430 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); 431 } else { 432 if (is_optimized()) { 433 set_ic_destination(info.entry()); 434 } else { 435 set_ic_destination_and_value(info.entry(), info.cached_metadata()); 436 } 437 } 438 439 if (TraceICs) { 440 ResourceMark rm(thread); 441 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); 442 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", 443 p2i(instruction_address()), 444 ((Klass*)info.cached_metadata())->print_value_string(), 445 (safe) ? "" : "via stub"); 446 } 447 } 448 // We can't check this anymore. With lazy deopt we could have already 449 // cleaned this IC entry before we even return. This is possible if 450 // we ran out of space in the inline cache buffer trying to do the 451 // set_next and we safepointed to free up space. This is a benign 452 // race because the IC entry was complete when we safepointed so 453 // cleaning it immediately is harmless. 454 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 455 } 456 457 458 // is_optimized: Compiler has generated an optimized call (i.e. fixed, no inline cache) 459 // static_bound: The call can be static bound. If it isn't also optimized, the property 460 // wasn't provable at time of compilation. An optimized call will have any necessary 461 // null check, while a static_bound won't. A static_bound (but not optimized) must 462 // therefore use the unverified entry point. 463 void CompiledIC::compute_monomorphic_entry(const methodHandle& method, 464 Klass* receiver_klass, 465 bool is_optimized, 466 bool static_bound, 467 bool caller_is_nmethod, 468 CompiledICInfo& info, 469 TRAPS) { 470 CompiledMethod* method_code = method->code(); 471 472 address entry = NULL; 473 if (method_code != NULL && method_code->is_in_use()) { 474 assert(method_code->is_compiled(), "must be compiled"); 475 // Call to compiled code 476 // 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 (is_optimized), we will emit 480 // an optimized virtual call (no inline cache), and need a Method* to make 481 // a call to the interpreter 482 // - if we don't 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 // - In the case that we here notice the call is static bound we 486 // convert the call into what looks to be an optimized virtual call, 487 // but we must use the unverified entry point (since there will be no 488 // null check on a call when the target isn't loaded). 489 // This causes problems when verifying the IC because 490 // it looks vanilla but is optimized. Code in is_call_to_interpreted 491 // is aware of this and weakens its asserts. 492 if (is_optimized) { 493 entry = method_code->verified_entry_point(); 494 } else { 495 entry = method_code->entry_point(); 496 } 497 } 498 bool far_c2a = entry != NULL && caller_is_nmethod && method_code->is_far_code(); 499 if (entry != NULL && !far_c2a) { 500 // Call to near compiled code (nmethod or aot). 501 info.set_compiled_entry(entry, is_optimized ? NULL : receiver_klass, is_optimized); 502 } else { 503 if (is_optimized) { 504 if (far_c2a) { 505 // Call to aot code from nmethod. 506 info.set_aot_entry(entry, method()); 507 } else { 508 // Use stub entry 509 info.set_interpreter_entry(method()->get_c2i_entry(), method()); 510 } 511 } else { 512 // Use icholder entry 513 assert(method_code == NULL || method_code->is_compiled(), "must be compiled"); 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 if (cb != NULL && cb->is_adapter_blob()) { 525 return true; 526 } 527 // itable stubs also use CompiledICHolder 528 if (VtableStubs::is_entry_point(entry) && VtableStubs::stub_containing(entry)->is_itable_stub()) { 529 return true; 530 } 531 return false; 532 } 533 534 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) { 535 // This call site might have become stale so inspect it carefully. 536 address dest = cm->call_wrapper_at(call_site->addr())->destination(); 537 return is_icholder_entry(dest); 538 } 539 540 // Release the CompiledICHolder* associated with this call site is there is one. 541 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) { 542 assert(cm->is_nmethod(), "must be nmethod"); 543 // This call site might have become stale so inspect it carefully. 544 NativeCall* call = nativeCall_at(call_site->addr()); 545 if (is_icholder_entry(call->destination())) { 546 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); 547 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); 548 } 549 } 550 551 // ---------------------------------------------------------------------------- 552 553 void CompiledStaticCall::set_to_clean() { 554 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 555 // Reset call site 556 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); 557 #ifdef ASSERT 558 CodeBlob* cb = CodeCache::find_blob_unsafe(instruction_address()); 559 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 560 #endif 561 562 set_destination_mt_safe(resolve_call_stub()); 563 564 // Do not reset stub here: It is too expensive to call find_stub. 565 // Instead, rely on caller (nmethod::clear_inline_caches) to clear 566 // both the call and its stub. 567 } 568 569 bool CompiledStaticCall::is_clean() const { 570 return destination() == resolve_call_stub(); 571 } 572 573 bool CompiledStaticCall::is_call_to_compiled() const { 574 return CodeCache::contains(destination()); 575 } 576 577 bool CompiledDirectStaticCall::is_call_to_interpreted() const { 578 // It is a call to interpreted, if it calls to a stub. Hence, the destination 579 // must be in the stub part of the nmethod that contains the call 580 CompiledMethod* cm = CodeCache::find_compiled(instruction_address()); 581 return cm->stub_contains(destination()); 582 } 583 584 bool CompiledDirectStaticCall::is_call_to_far() const { 585 // It is a call to aot method, if it calls to a stub. Hence, the destination 586 // must be in the stub part of the nmethod that contains the call 587 CodeBlob* desc = CodeCache::find_blob(instruction_address()); 588 return desc->as_compiled_method()->stub_contains(destination()); 589 } 590 591 void CompiledStaticCall::set_to_compiled(address entry) { 592 if (TraceICs) { 593 ResourceMark rm; 594 tty->print_cr("%s@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, 595 name(), 596 p2i(instruction_address()), 597 p2i(entry)); 598 } 599 // Call to compiled code 600 assert(CodeCache::contains(entry), "wrong entry point"); 601 set_destination_mt_safe(entry); 602 } 603 604 void CompiledStaticCall::set(const StaticCallInfo& info) { 605 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 606 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 607 // Updating a cache to the wrong entry can cause bugs that are very hard 608 // to track down - if cache entry gets invalid - we just clean it. In 609 // this way it is always the same code path that is responsible for 610 // updating and resolving an inline cache 611 assert(is_clean(), "do not update a call entry - use clean"); 612 613 if (info._to_interpreter) { 614 // Call to interpreted code 615 set_to_interpreted(info.callee(), info.entry()); 616 #if INCLUDE_AOT 617 } else if (info._to_aot) { 618 // Call to far code 619 set_to_far(info.callee(), info.entry()); 620 #endif 621 } else { 622 set_to_compiled(info.entry()); 623 } 624 } 625 626 // Compute settings for a CompiledStaticCall. Since we might have to set 627 // the stub when calling to the interpreter, we need to return arguments. 628 void CompiledStaticCall::compute_entry(const methodHandle& m, bool caller_is_nmethod, StaticCallInfo& info) { 629 CompiledMethod* m_code = m->code(); 630 info._callee = m; 631 if (m_code != NULL && m_code->is_in_use()) { 632 if (caller_is_nmethod && m_code->is_far_code()) { 633 // Call to far aot code from nmethod. 634 info._to_aot = true; 635 } else { 636 info._to_aot = false; 637 } 638 info._to_interpreter = false; 639 info._entry = m_code->verified_entry_point(); 640 } else { 641 // Callee is interpreted code. In any case entering the interpreter 642 // puts a converter-frame on the stack to save arguments. 643 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics"); 644 info._to_interpreter = true; 645 info._entry = m()->get_c2i_entry(); 646 } 647 } 648 649 address CompiledDirectStaticCall::find_stub_for(address instruction, bool is_aot) { 650 // Find reloc. information containing this call-site 651 RelocIterator iter((nmethod*)NULL, instruction); 652 while (iter.next()) { 653 if (iter.addr() == instruction) { 654 switch(iter.type()) { 655 case relocInfo::static_call_type: 656 return iter.static_call_reloc()->static_stub(is_aot); 657 // We check here for opt_virtual_call_type, since we reuse the code 658 // from the CompiledIC implementation 659 case relocInfo::opt_virtual_call_type: 660 return iter.opt_virtual_call_reloc()->static_stub(is_aot); 661 case relocInfo::poll_type: 662 case relocInfo::poll_return_type: // A safepoint can't overlap a call. 663 default: 664 ShouldNotReachHere(); 665 } 666 } 667 } 668 return NULL; 669 } 670 671 address CompiledDirectStaticCall::find_stub(bool is_aot) { 672 return CompiledDirectStaticCall::find_stub_for(instruction_address(), is_aot); 673 } 674 675 address CompiledDirectStaticCall::resolve_call_stub() const { 676 return SharedRuntime::get_resolve_static_call_stub(); 677 } 678 679 //----------------------------------------------------------------------------- 680 // Non-product mode code 681 #ifndef PRODUCT 682 683 void CompiledIC::verify() { 684 _call->verify(); 685 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() 686 || is_optimized() || is_megamorphic(), "sanity check"); 687 } 688 689 void CompiledIC::print() { 690 print_compiled_ic(); 691 tty->cr(); 692 } 693 694 void CompiledIC::print_compiled_ic() { 695 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, 696 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value())); 697 } 698 699 void CompiledDirectStaticCall::print() { 700 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address())); 701 if (is_clean()) { 702 tty->print("clean"); 703 } else if (is_call_to_compiled()) { 704 tty->print("compiled"); 705 } else if (is_call_to_far()) { 706 tty->print("far"); 707 } else if (is_call_to_interpreted()) { 708 tty->print("interpreted"); 709 } 710 tty->cr(); 711 } 712 713 #endif // !PRODUCT