1 /* 2 * Copyright (c) 1997, 2016, 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 = (void*)_value->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(_ic_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*)_value->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(_ic_call); 106 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 107 #endif 108 _ic_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 _value->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 _ic_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(_ic_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 _ic_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 //----------------------------------------------------------------------------- 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() == _ic_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 = nativeMovConstReg_at(r->cached_value()); 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 : _ic_call(call) 187 { 188 address ic_call = _ic_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 : _ic_call(nativeCall_at(iter->addr())) 205 { 206 address ic_call = _ic_call->instruction_address(); 207 208 CompiledMethod* nm = iter->code(); 209 assert(ic_call != NULL, "ic_call address must be set"); 210 assert(nm != NULL, "must pass compiled method"); 211 assert(nm->contains(ic_call), "must be in compiled method"); 212 213 initialize_from_iter(iter); 214 } 215 216 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { 217 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 218 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); 219 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); 220 221 address entry; 222 if (call_info->call_kind() == CallInfo::itable_call) { 223 assert(bytecode == Bytecodes::_invokeinterface, ""); 224 int itable_index = call_info->itable_index(); 225 entry = VtableStubs::find_itable_stub(itable_index); 226 if (entry == false) { 227 return false; 228 } 229 #ifdef ASSERT 230 int index = call_info->resolved_method()->itable_index(); 231 assert(index == itable_index, "CallInfo pre-computes this"); 232 #endif //ASSERT 233 InstanceKlass* k = call_info->resolved_method()->method_holder(); 234 assert(k->verify_itable_index(itable_index), "sanity check"); 235 InlineCacheBuffer::create_transition_stub(this, k, entry); 236 } else { 237 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); 238 // Can be different than selected_method->vtable_index(), due to package-private etc. 239 int vtable_index = call_info->vtable_index(); 240 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); 241 entry = VtableStubs::find_vtable_stub(vtable_index); 242 if (entry == NULL) { 243 return false; 244 } 245 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 246 } 247 248 if (TraceICs) { 249 ResourceMark rm; 250 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, 251 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry)); 252 } 253 254 // We can't check this anymore. With lazy deopt we could have already 255 // cleaned this IC entry before we even return. This is possible if 256 // we ran out of space in the inline cache buffer trying to do the 257 // set_next and we safepointed to free up space. This is a benign 258 // race because the IC entry was complete when we safepointed so 259 // cleaning it immediately is harmless. 260 // assert(is_megamorphic(), "sanity check"); 261 return true; 262 } 263 264 265 // true if destination is megamorphic stub 266 bool CompiledIC::is_megamorphic() const { 267 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 268 assert(!is_optimized(), "an optimized call cannot be megamorphic"); 269 270 // Cannot rely on cached_value. It is either an interface or a method. 271 return VtableStubs::is_entry_point(ic_destination()); 272 } 273 274 bool CompiledIC::is_call_to_compiled() const { 275 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 276 277 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie 278 // method is guaranteed to still exist, since we only remove methods after all inline caches 279 // has been cleaned up 280 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 281 bool is_monomorphic = (cb != NULL && cb->is_compiled()); 282 // Check that the cached_value is a klass for non-optimized monomorphic calls 283 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used 284 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL). 285 // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized 286 // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites. 287 #ifdef ASSERT 288 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); 289 bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci(); 290 assert( is_c1_or_jvmci_method || 291 !is_monomorphic || 292 is_optimized() || 293 !caller->is_alive() || 294 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); 295 #endif // ASSERT 296 return is_monomorphic; 297 } 298 299 300 bool CompiledIC::is_call_to_interpreted() const { 301 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 302 // Call to interpreter if destination is either calling to a stub (if it 303 // is optimized), or calling to an I2C blob 304 bool is_call_to_interpreted = false; 305 if (!is_optimized()) { 306 // must use unsafe because the destination can be a zombie (and we're cleaning) 307 // and the print_compiled_ic code wants to know if site (in the non-zombie) 308 // is to the interpreter. 309 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 310 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); 311 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); 312 } else { 313 // Check if we are calling into our own codeblob (i.e., to a stub) 314 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); 315 address dest = ic_destination(); 316 #ifdef ASSERT 317 { 318 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 319 assert(!db->is_adapter_blob(), "must use stub!"); 320 } 321 #endif /* ASSERT */ 322 is_call_to_interpreted = cb->contains(dest); 323 } 324 return is_call_to_interpreted; 325 } 326 327 328 void CompiledIC::set_to_clean(bool in_use) { 329 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); 330 if (TraceInlineCacheClearing || TraceICs) { 331 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address())); 332 print(); 333 } 334 335 address entry; 336 if (is_optimized()) { 337 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); 338 } else { 339 entry = SharedRuntime::get_resolve_virtual_call_stub(); 340 } 341 342 // A zombie transition will always be safe, since the metadata has already been set to NULL, so 343 // we only need to patch the destination 344 bool safe_transition = !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint(); 345 346 if (safe_transition) { 347 // Kill any leftover stub we might have too 348 clear_ic_stub(); 349 if (is_optimized()) { 350 set_ic_destination(entry); 351 } else { 352 set_ic_destination_and_value(entry, (void*)NULL); 353 } 354 } else { 355 // Unsafe transition - create stub. 356 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 357 } 358 // We can't check this anymore. With lazy deopt we could have already 359 // cleaned this IC entry before we even return. This is possible if 360 // we ran out of space in the inline cache buffer trying to do the 361 // set_next and we safepointed to free up space. This is a benign 362 // race because the IC entry was complete when we safepointed so 363 // cleaning it immediately is harmless. 364 // assert(is_clean(), "sanity check"); 365 } 366 367 368 bool CompiledIC::is_clean() const { 369 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 370 bool is_clean = false; 371 address dest = ic_destination(); 372 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || 373 dest == SharedRuntime::get_resolve_virtual_call_stub(); 374 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); 375 return is_clean; 376 } 377 378 379 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { 380 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 381 // Updating a cache to the wrong entry can cause bugs that are very hard 382 // to track down - if cache entry gets invalid - we just clean it. In 383 // this way it is always the same code path that is responsible for 384 // updating and resolving an inline cache 385 // 386 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized 387 // callsites. In addition ic_miss code will update a site to monomorphic if it determines 388 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. 389 // 390 // In both of these cases the only thing being modifed is the jump/call target and these 391 // transitions are mt_safe 392 393 Thread *thread = Thread::current(); 394 if (info.to_interpreter()) { 395 // Call to interpreter 396 if (info.is_optimized() && is_optimized()) { 397 assert(is_clean(), "unsafe IC path"); 398 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 399 // the call analysis (callee structure) specifies that the call is optimized 400 // (either because of CHA or the static target is final) 401 // At code generation time, this call has been emitted as static call 402 // Call via stub 403 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); 404 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); 405 methodHandle method (thread, (Method*)info.cached_metadata()); 406 csc->set_to_interpreted(method, info.entry()); 407 if (TraceICs) { 408 ResourceMark rm(thread); 409 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", 410 p2i(instruction_address()), 411 method->print_value_string()); 412 } 413 } else { 414 // Call via method-klass-holder 415 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); 416 if (TraceICs) { 417 ResourceMark rm(thread); 418 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address())); 419 } 420 } 421 } else { 422 // Call to compiled code 423 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); 424 #ifdef ASSERT 425 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); 426 assert (cb->is_compiled(), "must be compiled!"); 427 #endif /* ASSERT */ 428 429 // This is MT safe if we come from a clean-cache and go through a 430 // non-verified entry point 431 bool safe = SafepointSynchronize::is_at_safepoint() || 432 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); 433 434 if (!safe) { 435 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); 436 } else { 437 if (is_optimized()) { 438 set_ic_destination(info.entry()); 439 } else { 440 set_ic_destination_and_value(info.entry(), info.cached_metadata()); 441 } 442 } 443 444 if (TraceICs) { 445 ResourceMark rm(thread); 446 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); 447 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", 448 p2i(instruction_address()), 449 ((Klass*)info.cached_metadata())->print_value_string(), 450 (safe) ? "" : "via stub"); 451 } 452 } 453 // We can't check this anymore. With lazy deopt we could have already 454 // cleaned this IC entry before we even return. This is possible if 455 // we ran out of space in the inline cache buffer trying to do the 456 // set_next and we safepointed to free up space. This is a benign 457 // race because the IC entry was complete when we safepointed so 458 // cleaning it immediately is harmless. 459 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 460 } 461 462 463 // is_optimized: Compiler has generated an optimized call (i.e., no inline 464 // cache) static_bound: The call can be static bound (i.e, no need to use 465 // inline cache) 466 void CompiledIC::compute_monomorphic_entry(const methodHandle& method, 467 KlassHandle receiver_klass, 468 bool is_optimized, 469 bool static_bound, 470 CompiledICInfo& info, 471 TRAPS) { 472 CompiledMethod* method_code = method->code(); 473 474 address entry = NULL; 475 if (method_code != NULL && method_code->is_in_use()) { 476 assert(method_code->is_compiled(), "must be compiled"); 477 // Call to compiled code 478 if (static_bound || is_optimized) { 479 entry = method_code->verified_entry_point(); 480 } else { 481 entry = method_code->entry_point(); 482 } 483 } 484 if (entry != NULL) { 485 // Call to compiled code 486 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); 487 } else { 488 // Note: the following problem exists with Compiler1: 489 // - at compile time we may or may not know if the destination is final 490 // - if we know that the destination is final, we will emit an optimized 491 // virtual call (no inline cache), and need a Method* to make a call 492 // to the interpreter 493 // - if we do not know if the destination is final, we emit a standard 494 // virtual call, and use CompiledICHolder to call interpreted code 495 // (no static call stub has been generated) 496 // However in that case we will now notice it is static_bound 497 // and convert the call into what looks to be an optimized 498 // virtual call. This causes problems in verifying the IC because 499 // it look vanilla but is optimized. Code in is_call_to_interpreted 500 // is aware of this and weakens its asserts. 501 502 // static_bound should imply is_optimized -- otherwise we have a 503 // performance bug (statically-bindable method is called via 504 // dynamically-dispatched call note: the reverse implication isn't 505 // necessarily true -- the call may have been optimized based on compiler 506 // analysis (static_bound is only based on "final" etc.) 507 #ifdef COMPILER2 508 #ifdef TIERED 509 #if defined(ASSERT) 510 // can't check the assert because we don't have the CompiledIC with which to 511 // find the address if the call instruction. 512 // 513 // CodeBlob* cb = find_blob_unsafe(instruction_address()); 514 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); 515 #endif // ASSERT 516 #else 517 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); 518 #endif // TIERED 519 #endif // COMPILER2 520 if (is_optimized) { 521 // Use stub entry 522 info.set_interpreter_entry(method()->get_c2i_entry(), method()); 523 } else { 524 // Use icholder entry 525 assert(method_code == NULL || method_code->is_compiled(), "must be compiled"); 526 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); 527 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); 528 } 529 } 530 assert(info.is_optimized() == is_optimized, "must agree"); 531 } 532 533 534 bool CompiledIC::is_icholder_entry(address entry) { 535 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); 536 return (cb != NULL && cb->is_adapter_blob()); 537 } 538 539 // Release the CompiledICHolder* associated with this call site is there is one. 540 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { 541 // This call site might have become stale so inspect it carefully. 542 NativeCall* call = nativeCall_at(call_site->addr()); 543 if (is_icholder_entry(call->destination())) { 544 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); 545 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); 546 } 547 } 548 549 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { 550 // This call site might have become stale so inspect it carefully. 551 NativeCall* call = nativeCall_at(call_site->addr()); 552 return is_icholder_entry(call->destination()); 553 } 554 555 // ---------------------------------------------------------------------------- 556 557 void CompiledStaticCall::set_to_clean() { 558 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 559 // Reset call site 560 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); 561 #ifdef ASSERT 562 CodeBlob* cb = CodeCache::find_blob_unsafe(this); 563 assert(cb != NULL && cb->is_compiled(), "must be compiled"); 564 #endif 565 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); 566 567 // Do not reset stub here: It is too expensive to call find_stub. 568 // Instead, rely on caller (nmethod::clear_inline_caches) to clear 569 // both the call and its stub. 570 } 571 572 573 bool CompiledStaticCall::is_clean() const { 574 return destination() == SharedRuntime::get_resolve_static_call_stub(); 575 } 576 577 bool CompiledStaticCall::is_call_to_compiled() const { 578 return CodeCache::contains(destination()); 579 } 580 581 582 bool CompiledStaticCall::is_call_to_interpreted() const { 583 // It is a call to interpreted, if it calls to a stub. Hence, the destination 584 // must be in the stub part of the nmethod that contains the call 585 CompiledMethod* cm = CodeCache::find_compiled(instruction_address()); 586 return cm->stub_contains(destination()); 587 } 588 589 void CompiledStaticCall::set(const StaticCallInfo& info) { 590 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 591 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 592 // Updating a cache to the wrong entry can cause bugs that are very hard 593 // to track down - if cache entry gets invalid - we just clean it. In 594 // this way it is always the same code path that is responsible for 595 // updating and resolving an inline cache 596 assert(is_clean(), "do not update a call entry - use clean"); 597 598 if (info._to_interpreter) { 599 // Call to interpreted code 600 set_to_interpreted(info.callee(), info.entry()); 601 } else { 602 if (TraceICs) { 603 ResourceMark rm; 604 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, 605 p2i(instruction_address()), 606 p2i(info.entry())); 607 } 608 // Call to compiled code 609 assert (CodeCache::contains(info.entry()), "wrong entry point"); 610 set_destination_mt_safe(info.entry()); 611 } 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, StaticCallInfo& info) { 618 CompiledMethod* m_code = m->code(); 619 info._callee = m; 620 if (m_code != NULL && m_code->is_in_use()) { 621 info._to_interpreter = false; 622 info._entry = m_code->verified_entry_point(); 623 } else { 624 // Callee is interpreted code. In any case entering the interpreter 625 // puts a converter-frame on the stack to save arguments. 626 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics"); 627 info._to_interpreter = true; 628 info._entry = m()->get_c2i_entry(); 629 } 630 } 631 632 address CompiledStaticCall::find_stub() { 633 // Find reloc. information containing this call-site 634 RelocIterator iter((nmethod*)NULL, instruction_address()); 635 while (iter.next()) { 636 if (iter.addr() == instruction_address()) { 637 switch(iter.type()) { 638 case relocInfo::static_call_type: 639 return iter.static_call_reloc()->static_stub(); 640 // We check here for opt_virtual_call_type, since we reuse the code 641 // from the CompiledIC implementation 642 case relocInfo::opt_virtual_call_type: 643 return iter.opt_virtual_call_reloc()->static_stub(); 644 case relocInfo::poll_type: 645 case relocInfo::poll_return_type: // A safepoint can't overlap a call. 646 default: 647 ShouldNotReachHere(); 648 } 649 } 650 } 651 return NULL; 652 } 653 654 655 //----------------------------------------------------------------------------- 656 // Non-product mode code 657 #ifndef PRODUCT 658 659 void CompiledIC::verify() { 660 // make sure code pattern is actually a call imm32 instruction 661 _ic_call->verify(); 662 if (os::is_MP()) { 663 _ic_call->verify_alignment(); 664 } 665 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() 666 || is_optimized() || is_megamorphic(), "sanity check"); 667 } 668 669 void CompiledIC::print() { 670 print_compiled_ic(); 671 tty->cr(); 672 } 673 674 void CompiledIC::print_compiled_ic() { 675 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, 676 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value())); 677 } 678 679 void CompiledStaticCall::print() { 680 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address())); 681 if (is_clean()) { 682 tty->print("clean"); 683 } else if (is_call_to_compiled()) { 684 tty->print("compiled"); 685 } else if (is_call_to_interpreted()) { 686 tty->print("interpreted"); 687 } 688 tty->cr(); 689 } 690 691 #endif // !PRODUCT