1 /* 2 * Copyright (c) 1997, 2017, 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.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/symbol.hpp" 40 #include "runtime/icache.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 #include "runtime/stubRoutines.hpp" 43 #include "utilities/events.hpp" 44 45 46 // Every time a compiled IC is changed or its type is being accessed, 47 // either the CompiledIC_lock must be set or we must be at a safe point. 48 49 //----------------------------------------------------------------------------- 50 // Low-level access to an inline cache. Private, since they might not be 51 // MT-safe to use. 52 53 void* CompiledIC::cached_value() const { 54 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 55 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); 56 57 if (!is_in_transition_state()) { 58 void* data = get_data(); 59 // If we let the metadata value here be initialized to zero... 60 assert(data != NULL || Universe::non_oop_word() == NULL, 61 "no raw nulls in CompiledIC metadatas, because of patching races"); 62 return (data == (void*)Universe::non_oop_word()) ? NULL : data; 63 } else { 64 return InlineCacheBuffer::cached_value_for((CompiledIC *)this); 65 } 66 } 67 68 69 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { 70 assert(entry_point != NULL, "must set legal entry point"); 71 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 72 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); 73 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); 74 75 assert(!is_icholder || is_icholder_entry(entry_point), "must be"); 76 77 // Don't use ic_destination for this test since that forwards 78 // through ICBuffer instead of returning the actual current state of 79 // the CompiledIC. 80 if (is_icholder_entry(_call->destination())) { 81 // When patching for the ICStub case the cached value isn't 82 // overwritten until the ICStub copied into the CompiledIC during 83 // the next safepoint. Make sure that the CompiledICHolder* is 84 // marked for release at this point since it won't be identifiable 85 // once the entry point is overwritten. 86 InlineCacheBuffer::queue_for_release((CompiledICHolder*)get_data()); 87 } 88 89 if (TraceCompiledIC) { 90 tty->print(" "); 91 print_compiled_ic(); 92 tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point)); 93 if (!is_optimized()) { 94 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache)); 95 } 96 if (is_icstub) { 97 tty->print(" (icstub)"); 98 } 99 tty->cr(); 100 } 101 102 { 103 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); 104 #ifdef ASSERT 105 CodeBlob* cb = CodeCache::find_blob_unsafe(_call->instruction_address()); 106 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 107 #endif 108 _call->set_destination_mt_safe(entry_point); 109 } 110 111 if (is_optimized() || is_icstub) { 112 // Optimized call sites don't have a cache value and ICStub call 113 // sites only change the entry point. Changing the value in that 114 // case could lead to MT safety issues. 115 assert(cache == NULL, "must be null"); 116 return; 117 } 118 119 if (cache == NULL) cache = (void*)Universe::non_oop_word(); 120 121 set_data((intptr_t)cache); 122 } 123 124 125 void CompiledIC::set_ic_destination(ICStub* stub) { 126 internal_set_ic_destination(stub->code_begin(), true, NULL, false); 127 } 128 129 130 131 address CompiledIC::ic_destination() const { 132 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 133 if (!is_in_transition_state()) { 134 return _call->destination(); 135 } else { 136 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); 137 } 138 } 139 140 141 bool CompiledIC::is_in_transition_state() const { 142 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 143 return InlineCacheBuffer::contains(_call->destination());; 144 } 145 146 147 bool CompiledIC::is_icholder_call() const { 148 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 149 return !_is_optimized && is_icholder_entry(ic_destination()); 150 } 151 152 // Returns native address of 'call' instruction in inline-cache. Used by 153 // the InlineCacheBuffer when it needs to find the stub. 154 address CompiledIC::stub_address() const { 155 assert(is_in_transition_state(), "should only be called when we are in a transition state"); 156 return _call->destination(); 157 } 158 159 // Clears the IC stub if the compiled IC is in transition state 160 void CompiledIC::clear_ic_stub() { 161 if (is_in_transition_state()) { 162 ICStub* stub = ICStub_from_destination_address(stub_address()); 163 stub->clear(); 164 } 165 } 166 167 //----------------------------------------------------------------------------- 168 // High-level access to an inline cache. Guaranteed to be MT-safe. 169 170 void CompiledIC::initialize_from_iter(RelocIterator* iter) { 171 assert(iter->addr() == _call->instruction_address(), "must find ic_call"); 172 173 if (iter->type() == relocInfo::virtual_call_type) { 174 virtual_call_Relocation* r = iter->virtual_call_reloc(); 175 _is_optimized = false; 176 _value = _call->get_load_instruction(r); 177 } else { 178 assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); 179 _is_optimized = true; 180 _value = NULL; 181 } 182 } 183 184 CompiledIC::CompiledIC(CompiledMethod* cm, NativeCall* call) 185 : _method(cm) 186 { 187 _call = _method->call_wrapper_at((address) call); 188 address ic_call = _call->instruction_address(); 189 190 assert(ic_call != NULL, "ic_call address must be set"); 191 assert(cm != NULL, "must pass compiled method"); 192 assert(cm->contains(ic_call), "must be in compiled method"); 193 194 // Search for the ic_call at the given address. 195 RelocIterator iter(cm, ic_call, ic_call+1); 196 bool ret = iter.next(); 197 assert(ret == true, "relocInfo must exist at this address"); 198 assert(iter.addr() == ic_call, "must find ic_call"); 199 200 initialize_from_iter(&iter); 201 } 202 203 CompiledIC::CompiledIC(RelocIterator* iter) 204 : _method(iter->code()) 205 { 206 _call = _method->call_wrapper_at(iter->addr()); 207 address ic_call = _call->instruction_address(); 208 209 CompiledMethod* nm = iter->code(); 210 assert(ic_call != NULL, "ic_call address must be set"); 211 assert(nm != NULL, "must pass compiled method"); 212 assert(nm->contains(ic_call), "must be in compiled method"); 213 214 initialize_from_iter(iter); 215 } 216 217 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { 218 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 219 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); 220 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); 221 222 address entry; 223 if (call_info->call_kind() == CallInfo::itable_call) { 224 assert(bytecode == Bytecodes::_invokeinterface, ""); 225 int itable_index = call_info->itable_index(); 226 entry = VtableStubs::find_itable_stub(itable_index); 227 if (entry == false) { 228 return false; 229 } 230 #ifdef ASSERT 231 int index = call_info->resolved_method()->itable_index(); 232 assert(index == itable_index, "CallInfo pre-computes this"); 233 #endif //ASSERT 234 InstanceKlass* k = call_info->resolved_method()->method_holder(); 235 assert(k->verify_itable_index(itable_index), "sanity check"); 236 InlineCacheBuffer::create_transition_stub(this, k, entry); 237 } else { 238 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); 239 // Can be different than selected_method->vtable_index(), due to package-private etc. 240 int vtable_index = call_info->vtable_index(); 241 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); 242 entry = VtableStubs::find_vtable_stub(vtable_index); 243 if (entry == NULL) { 244 return false; 245 } 246 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 247 } 248 249 if (TraceICs) { 250 ResourceMark rm; 251 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, 252 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry)); 253 } 254 255 // We can't check this anymore. With lazy deopt we could have already 256 // cleaned this IC entry before we even return. This is possible if 257 // we ran out of space in the inline cache buffer trying to do the 258 // set_next and we safepointed to free up space. This is a benign 259 // race because the IC entry was complete when we safepointed so 260 // cleaning it immediately is harmless. 261 // assert(is_megamorphic(), "sanity check"); 262 return true; 263 } 264 265 266 // true if destination is megamorphic stub 267 bool CompiledIC::is_megamorphic() const { 268 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 269 assert(!is_optimized(), "an optimized call cannot be megamorphic"); 270 271 // Cannot rely on cached_value. It is either an interface or a method. 272 return VtableStubs::is_entry_point(ic_destination()); 273 } 274 275 bool CompiledIC::is_call_to_compiled() const { 276 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 277 278 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie 279 // method is guaranteed to still exist, since we only remove methods after all inline caches 280 // has been cleaned up 281 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 282 bool is_monomorphic = (cb != NULL && cb->is_compiled()); 283 // Check that the cached_value is a klass for non-optimized monomorphic calls 284 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used 285 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL). 286 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized 287 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites. 288 #ifdef ASSERT 289 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); 290 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci(); 291 assert( is_c1_or_jvmci_method || 292 !is_monomorphic || 293 is_optimized() || 294 !caller->is_alive() || 295 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); 296 #endif // ASSERT 297 return is_monomorphic; 298 } 299 300 301 bool CompiledIC::is_call_to_interpreted() const { 302 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 303 // Call to interpreter if destination is either calling to a stub (if it 304 // is optimized), or calling to an I2C blob 305 bool is_call_to_interpreted = false; 306 if (!is_optimized()) { 307 // must use unsafe because the destination can be a zombie (and we're cleaning) 308 // and the print_compiled_ic code wants to know if site (in the non-zombie) 309 // is to the interpreter. 310 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 311 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); 312 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); 313 } else { 314 // Check if we are calling into our own codeblob (i.e., to a stub) 315 address dest = ic_destination(); 316 #ifdef ASSERT 317 { 318 _call->verify_resolve_call(dest); 319 } 320 #endif /* ASSERT */ 321 is_call_to_interpreted = _call->is_call_to_interpreted(dest); 322 } 323 return is_call_to_interpreted; 324 } 325 326 void CompiledIC::set_to_clean(bool in_use) { 327 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); 328 if (TraceInlineCacheClearing || TraceICs) { 329 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address())); 330 print(); 331 } 332 333 address entry = _call->get_resolve_call_stub(is_optimized()); 334 335 // A zombie transition will always be safe, since the metadata has already been set to NULL, so 336 // we only need to patch the destination 337 bool safe_transition = _call->is_safe_for_patching() || !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint(); 338 339 if (safe_transition) { 340 // Kill any leftover stub we might have too 341 clear_ic_stub(); 342 if (is_optimized()) { 343 set_ic_destination(entry); 344 } else { 345 set_ic_destination_and_value(entry, (void*)NULL); 346 } 347 } else { 348 // Unsafe transition - create stub. 349 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 350 } 351 // We can't check this anymore. With lazy deopt we could have already 352 // cleaned this IC entry before we even return. This is possible if 353 // we ran out of space in the inline cache buffer trying to do the 354 // set_next and we safepointed to free up space. This is a benign 355 // race because the IC entry was complete when we safepointed so 356 // cleaning it immediately is harmless. 357 // assert(is_clean(), "sanity check"); 358 } 359 360 bool CompiledIC::is_clean() const { 361 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 362 bool is_clean = false; 363 address dest = ic_destination(); 364 is_clean = dest == _call->get_resolve_call_stub(is_optimized()); 365 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); 366 return is_clean; 367 } 368 369 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { 370 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 371 // Updating a cache to the wrong entry can cause bugs that are very hard 372 // to track down - if cache entry gets invalid - we just clean it. In 373 // this way it is always the same code path that is responsible for 374 // updating and resolving an inline cache 375 // 376 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized 377 // callsites. In addition ic_miss code will update a site to monomorphic if it determines 378 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. 379 // 380 // In both of these cases the only thing being modifed is the jump/call target and these 381 // transitions are mt_safe 382 383 Thread *thread = Thread::current(); 384 if (info.to_interpreter() || info.to_aot()) { 385 // Call to interpreter 386 if (info.is_optimized() && is_optimized()) { 387 assert(is_clean(), "unsafe IC path"); 388 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 389 // the call analysis (callee structure) specifies that the call is optimized 390 // (either because of CHA or the static target is final) 391 // At code generation time, this call has been emitted as static call 392 // Call via stub 393 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); 394 methodHandle method (thread, (Method*)info.cached_metadata()); 395 _call->set_to_interpreted(method, info); 396 397 if (TraceICs) { 398 ResourceMark rm(thread); 399 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to %s: %s", 400 p2i(instruction_address()), 401 (info.to_aot() ? "aot" : "interpreter"), 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_compiled(), "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. fixed, no inline cache) 455 // static_bound: The call can be static bound. If it isn't also optimized, the property 456 // wasn't provable at time of compilation. An optimized call will have any necessary 457 // null check, while a static_bound won't. A static_bound (but not optimized) must 458 // therefore use the unverified entry point. 459 void CompiledIC::compute_monomorphic_entry(const methodHandle& method, 460 Klass* receiver_klass, 461 bool is_optimized, 462 bool static_bound, 463 bool caller_is_nmethod, 464 CompiledICInfo& info, 465 TRAPS) { 466 CompiledMethod* method_code = method->code(); 467 468 address entry = NULL; 469 if (method_code != NULL && method_code->is_in_use()) { 470 assert(method_code->is_compiled(), "must be compiled"); 471 // Call to compiled code 472 // 473 // Note: the following problem exists with Compiler1: 474 // - at compile time we may or may not know if the destination is final 475 // - if we know that the destination is final (is_optimized), we will emit 476 // an optimized virtual call (no inline cache), and need a Method* to make 477 // a call to the interpreter 478 // - if we don't know if the destination is final, we emit a standard 479 // virtual call, and use CompiledICHolder to call interpreted code 480 // (no static call stub has been generated) 481 // - In the case that we here notice the call is static bound we 482 // convert the call into what looks to be an optimized virtual call, 483 // but we must use the unverified entry point (since there will be no 484 // null check on a call when the target isn't loaded). 485 // This causes problems when verifying the IC because 486 // it looks vanilla but is optimized. Code in is_call_to_interpreted 487 // is aware of this and weakens its asserts. 488 if (is_optimized) { 489 entry = method_code->verified_entry_point(); 490 } else { 491 entry = method_code->entry_point(); 492 } 493 } 494 bool far_c2a = entry != NULL && caller_is_nmethod && method_code->is_far_code(); 495 if (entry != NULL && !far_c2a) { 496 // Call to near compiled code (nmethod or aot). 497 info.set_compiled_entry(entry, is_optimized ? NULL : receiver_klass, is_optimized); 498 } else { 499 if (is_optimized) { 500 if (far_c2a) { 501 // Call to aot code from nmethod. 502 info.set_aot_entry(entry, method()); 503 } else { 504 // Use stub entry 505 info.set_interpreter_entry(method()->get_c2i_entry(), method()); 506 } 507 } else { 508 // Use icholder entry 509 assert(method_code == NULL || method_code->is_compiled(), "must be compiled"); 510 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass); 511 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); 512 } 513 } 514 assert(info.is_optimized() == is_optimized, "must agree"); 515 } 516 517 518 bool CompiledIC::is_icholder_entry(address entry) { 519 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); 520 return (cb != NULL && cb->is_adapter_blob()); 521 } 522 523 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) { 524 // This call site might have become stale so inspect it carefully. 525 address dest = cm->call_wrapper_at(call_site->addr())->destination(); 526 return is_icholder_entry(dest); 527 } 528 529 // Release the CompiledICHolder* associated with this call site is there is one. 530 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) { 531 assert(cm->is_nmethod(), "must be nmethod"); 532 // This call site might have become stale so inspect it carefully. 533 NativeCall* call = nativeCall_at(call_site->addr()); 534 if (is_icholder_entry(call->destination())) { 535 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); 536 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); 537 } 538 } 539 540 // ---------------------------------------------------------------------------- 541 542 void CompiledStaticCall::set_to_clean() { 543 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 544 // Reset call site 545 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); 546 #ifdef ASSERT 547 CodeBlob* cb = CodeCache::find_blob_unsafe(instruction_address()); 548 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 549 #endif 550 551 set_destination_mt_safe(resolve_call_stub()); 552 553 // Do not reset stub here: It is too expensive to call find_stub. 554 // Instead, rely on caller (nmethod::clear_inline_caches) to clear 555 // both the call and its stub. 556 } 557 558 bool CompiledStaticCall::is_clean() const { 559 return destination() == resolve_call_stub(); 560 } 561 562 bool CompiledStaticCall::is_call_to_compiled() const { 563 return CodeCache::contains(destination()); 564 } 565 566 bool CompiledDirectStaticCall::is_call_to_interpreted() const { 567 // It is a call to interpreted, if it calls to a stub. Hence, the destination 568 // must be in the stub part of the nmethod that contains the call 569 CompiledMethod* cm = CodeCache::find_compiled(instruction_address()); 570 return cm->stub_contains(destination()); 571 } 572 573 bool CompiledDirectStaticCall::is_call_to_far() const { 574 // It is a call to aot method, if it calls to a stub. Hence, the destination 575 // must be in the stub part of the nmethod that contains the call 576 CodeBlob* desc = CodeCache::find_blob(instruction_address()); 577 return desc->as_compiled_method()->stub_contains(destination()); 578 } 579 580 void CompiledStaticCall::set_to_compiled(address entry) { 581 if (TraceICs) { 582 ResourceMark rm; 583 tty->print_cr("%s@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, 584 name(), 585 p2i(instruction_address()), 586 p2i(entry)); 587 } 588 // Call to compiled code 589 assert(CodeCache::contains(entry), "wrong entry point"); 590 set_destination_mt_safe(entry); 591 } 592 593 void CompiledStaticCall::set(const StaticCallInfo& info) { 594 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 595 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 596 // Updating a cache to the wrong entry can cause bugs that are very hard 597 // to track down - if cache entry gets invalid - we just clean it. In 598 // this way it is always the same code path that is responsible for 599 // updating and resolving an inline cache 600 assert(is_clean(), "do not update a call entry - use clean"); 601 602 if (info._to_interpreter) { 603 // Call to interpreted code 604 set_to_interpreted(info.callee(), info.entry()); 605 #if INCLUDE_AOT 606 } else if (info._to_aot) { 607 // Call to far code 608 set_to_far(info.callee(), info.entry()); 609 #endif 610 } else { 611 set_to_compiled(info.entry()); 612 } 613 } 614 615 // Compute settings for a CompiledStaticCall. Since we might have to set 616 // the stub when calling to the interpreter, we need to return arguments. 617 void CompiledStaticCall::compute_entry(const methodHandle& m, bool caller_is_nmethod, StaticCallInfo& info) { 618 CompiledMethod* m_code = m->code(); 619 info._callee = m; 620 if (m_code != NULL && m_code->is_in_use()) { 621 if (caller_is_nmethod && m_code->is_far_code()) { 622 // Call to far aot code from nmethod. 623 info._to_aot = true; 624 } else { 625 info._to_aot = false; 626 } 627 info._to_interpreter = false; 628 info._entry = m_code->verified_entry_point(); 629 } else { 630 // Callee is interpreted code. In any case entering the interpreter 631 // puts a converter-frame on the stack to save arguments. 632 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics"); 633 info._to_interpreter = true; 634 info._entry = m()->get_c2i_entry(); 635 } 636 } 637 638 address CompiledDirectStaticCall::find_stub_for(address instruction, bool is_aot) { 639 // Find reloc. information containing this call-site 640 RelocIterator iter((nmethod*)NULL, instruction); 641 while (iter.next()) { 642 if (iter.addr() == instruction) { 643 switch(iter.type()) { 644 case relocInfo::static_call_type: 645 return iter.static_call_reloc()->static_stub(is_aot); 646 // We check here for opt_virtual_call_type, since we reuse the code 647 // from the CompiledIC implementation 648 case relocInfo::opt_virtual_call_type: 649 return iter.opt_virtual_call_reloc()->static_stub(is_aot); 650 case relocInfo::poll_type: 651 case relocInfo::poll_return_type: // A safepoint can't overlap a call. 652 default: 653 ShouldNotReachHere(); 654 } 655 } 656 } 657 return NULL; 658 } 659 660 address CompiledDirectStaticCall::find_stub(bool is_aot) { 661 return CompiledDirectStaticCall::find_stub_for(instruction_address(), is_aot); 662 } 663 664 address CompiledDirectStaticCall::resolve_call_stub() const { 665 return SharedRuntime::get_resolve_static_call_stub(); 666 } 667 668 //----------------------------------------------------------------------------- 669 // Non-product mode code 670 #ifndef PRODUCT 671 672 void CompiledIC::verify() { 673 _call->verify(); 674 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() 675 || is_optimized() || is_megamorphic(), "sanity check"); 676 } 677 678 void CompiledIC::print() { 679 print_compiled_ic(); 680 tty->cr(); 681 } 682 683 void CompiledIC::print_compiled_ic() { 684 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, 685 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value())); 686 } 687 688 void CompiledDirectStaticCall::print() { 689 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address())); 690 if (is_clean()) { 691 tty->print("clean"); 692 } else if (is_call_to_compiled()) { 693 tty->print("compiled"); 694 } else if (is_call_to_far()) { 695 tty->print("far"); 696 } else if (is_call_to_interpreted()) { 697 tty->print("interpreted"); 698 } 699 tty->cr(); 700 } 701 702 #endif // !PRODUCT