1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 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 // Release the CompiledICHolder* associated with this call site is there is one. 50 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { 51 // This call site might have become stale so inspect it carefully. 52 NativeCall* call = nativeCall_at(call_site->addr()); 53 if (is_icholder_entry(call->destination())) { 54 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); 55 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); 56 } 57 } 58 59 60 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { 61 // This call site might have become stale so inspect it carefully. 62 NativeCall* call = nativeCall_at(call_site->addr()); 63 return is_icholder_entry(call->destination()); 64 } 65 66 67 //----------------------------------------------------------------------------- 68 // Low-level access to an inline cache. Private, since they might not be 69 // MT-safe to use. 70 71 void* CompiledIC::cached_value() const { 72 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 73 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); 74 75 if (!is_in_transition_state()) { 76 void* data = (void*)_value->data(); 77 // If we let the metadata value here be initialized to zero... 78 assert(data != NULL || Universe::non_oop_word() == NULL, 79 "no raw nulls in CompiledIC metadatas, because of patching races"); 80 return (data == (void*)Universe::non_oop_word()) ? NULL : data; 81 } else { 82 return InlineCacheBuffer::cached_value_for((CompiledIC *)this); 83 } 84 } 85 86 87 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { 88 assert(entry_point != NULL, "must set legal entry point"); 89 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 90 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); 91 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); 92 93 assert(!is_icholder || is_icholder_entry(entry_point), "must be"); 94 95 // Don't use ic_destination for this test since that forwards 96 // through ICBuffer instead of returning the actual current state of 97 // the CompiledIC. 98 if (is_icholder_entry(_ic_call->destination())) { 99 // When patching for the ICStub case the cached value isn't 100 // overwritten until the ICStub copied into the CompiledIC during 101 // the next safepoint. Make sure that the CompiledICHolder* is 102 // marked for release at this point since it won't be identifiable 103 // once the entry point is overwritten. 104 InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data()); 105 } 106 107 if (TraceCompiledIC) { 108 tty->print(" "); 109 print_compiled_ic(); 110 tty->print(" changing destination to " INTPTR_FORMAT, entry_point); 111 if (!is_optimized()) { 112 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", (address)cache); 113 } 114 if (is_icstub) { 115 tty->print(" (icstub)"); 116 } 117 tty->cr(); 118 } 119 120 { 121 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 122 #ifdef ASSERT 123 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); 124 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); 125 #endif 126 _ic_call->set_destination_mt_safe(entry_point); 127 } 128 129 if (is_optimized() || is_icstub) { 130 // Optimized call sites don't have a cache value and ICStub call 131 // sites only change the entry point. Changing the value in that 132 // case could lead to MT safety issues. 133 assert(cache == NULL, "must be null"); 134 return; 135 } 136 137 if (cache == NULL) cache = (void*)Universe::non_oop_word(); 138 139 _value->set_data((intptr_t)cache); 140 } 141 142 143 void CompiledIC::set_ic_destination(ICStub* stub) { 144 internal_set_ic_destination(stub->code_begin(), true, NULL, false); 145 } 146 147 148 149 address CompiledIC::ic_destination() const { 150 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 151 if (!is_in_transition_state()) { 152 return _ic_call->destination(); 153 } else { 154 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); 155 } 156 } 157 158 159 bool CompiledIC::is_in_transition_state() const { 160 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 161 return InlineCacheBuffer::contains(_ic_call->destination()); 162 } 163 164 165 bool CompiledIC::is_icholder_call() const { 166 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 167 return !_is_optimized && is_icholder_entry(ic_destination()); 168 } 169 170 // Returns native address of 'call' instruction in inline-cache. Used by 171 // the InlineCacheBuffer when it needs to find the stub. 172 address CompiledIC::stub_address() const { 173 assert(is_in_transition_state(), "should only be called when we are in a transition state"); 174 return _ic_call->destination(); 175 } 176 177 178 //----------------------------------------------------------------------------- 179 // High-level access to an inline cache. Guaranteed to be MT-safe. 180 181 182 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { 183 methodHandle method = call_info->selected_method(); 184 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); 185 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 186 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); 187 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); 188 189 address entry; 190 if (is_invoke_interface) { 191 int index = klassItable::compute_itable_index(call_info->resolved_method()()); 192 entry = VtableStubs::create_stub(false, index, method()); 193 assert(entry != NULL, "entry not computed"); 194 InstanceKlass* k = call_info->resolved_method()->method_holder(); 195 assert(k->is_interface(), "sanity check"); 196 InlineCacheBuffer::create_transition_stub(this, k, entry); 197 } else { 198 // Can be different than method->vtable_index(), due to package-private etc. 199 int vtable_index = call_info->vtable_index(); 200 entry = VtableStubs::create_stub(true, vtable_index, method()); 201 InlineCacheBuffer::create_transition_stub(this, method(), entry); 202 } 203 204 if (TraceICs) { 205 ResourceMark rm; 206 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, 207 instruction_address(), method->print_value_string(), entry); 208 } 209 210 // We can't check this anymore. With lazy deopt we could have already 211 // cleaned this IC entry before we even return. This is possible if 212 // we ran out of space in the inline cache buffer trying to do the 213 // set_next and we safepointed to free up space. This is a benign 214 // race because the IC entry was complete when we safepointed so 215 // cleaning it immediately is harmless. 216 // assert(is_megamorphic(), "sanity check"); 217 } 218 219 220 // true if destination is megamorphic stub 221 bool CompiledIC::is_megamorphic() const { 222 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 223 assert(!is_optimized(), "an optimized call cannot be megamorphic"); 224 225 // Cannot rely on cached_value. It is either an interface or a method. 226 return VtableStubs::is_entry_point(ic_destination()); 227 } 228 229 bool CompiledIC::is_call_to_compiled() const { 230 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 231 232 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie 233 // method is guaranteed to still exist, since we only remove methods after all inline caches 234 // has been cleaned up 235 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 236 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); 237 // Check that the cached_value is a klass for non-optimized monomorphic calls 238 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used 239 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) 240 #ifdef ASSERT 241 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); 242 bool is_c1_method = caller->is_compiled_by_c1(); 243 assert( is_c1_method || 244 !is_monomorphic || 245 is_optimized() || 246 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); 247 #endif // ASSERT 248 return is_monomorphic; 249 } 250 251 252 bool CompiledIC::is_call_to_interpreted() const { 253 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 254 // Call to interpreter if destination is either calling to a stub (if it 255 // is optimized), or calling to an I2C blob 256 bool is_call_to_interpreted = false; 257 if (!is_optimized()) { 258 // must use unsafe because the destination can be a zombie (and we're cleaning) 259 // and the print_compiled_ic code wants to know if site (in the non-zombie) 260 // is to the interpreter. 261 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); 262 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); 263 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); 264 } else { 265 // Check if we are calling into our own codeblob (i.e., to a stub) 266 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); 267 address dest = ic_destination(); 268 #ifdef ASSERT 269 { 270 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 271 assert(!db->is_adapter_blob(), "must use stub!"); 272 } 273 #endif /* ASSERT */ 274 is_call_to_interpreted = cb->contains(dest); 275 } 276 return is_call_to_interpreted; 277 } 278 279 280 void CompiledIC::set_to_clean() { 281 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); 282 if (TraceInlineCacheClearing || TraceICs) { 283 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); 284 print(); 285 } 286 287 address entry; 288 if (is_optimized()) { 289 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); 290 } else { 291 entry = SharedRuntime::get_resolve_virtual_call_stub(); 292 } 293 294 // A zombie transition will always be safe, since the metadata has already been set to NULL, so 295 // we only need to patch the destination 296 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); 297 298 if (safe_transition) { 299 // Kill any leftover stub we might have too 300 if (is_in_transition_state()) { 301 ICStub* old_stub = ICStub_from_destination_address(stub_address()); 302 old_stub->clear(); 303 } 304 if (is_optimized()) { 305 set_ic_destination(entry); 306 } else { 307 set_ic_destination_and_value(entry, (void*)NULL); 308 } 309 } else { 310 // Unsafe transition - create stub. 311 InlineCacheBuffer::create_transition_stub(this, NULL, entry); 312 } 313 // We can't check this anymore. With lazy deopt we could have already 314 // cleaned this IC entry before we even return. This is possible if 315 // we ran out of space in the inline cache buffer trying to do the 316 // set_next and we safepointed to free up space. This is a benign 317 // race because the IC entry was complete when we safepointed so 318 // cleaning it immediately is harmless. 319 // assert(is_clean(), "sanity check"); 320 } 321 322 323 bool CompiledIC::is_clean() const { 324 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 325 bool is_clean = false; 326 address dest = ic_destination(); 327 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || 328 dest == SharedRuntime::get_resolve_virtual_call_stub(); 329 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); 330 return is_clean; 331 } 332 333 334 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { 335 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); 336 // Updating a cache to the wrong entry can cause bugs that are very hard 337 // to track down - if cache entry gets invalid - we just clean it. In 338 // this way it is always the same code path that is responsible for 339 // updating and resolving an inline cache 340 // 341 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized 342 // callsites. In addition ic_miss code will update a site to monomorphic if it determines 343 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. 344 // 345 // In both of these cases the only thing being modifed is the jump/call target and these 346 // transitions are mt_safe 347 348 Thread *thread = Thread::current(); 349 if (info.to_interpreter()) { 350 // Call to interpreter 351 if (info.is_optimized() && is_optimized()) { 352 assert(is_clean(), "unsafe IC path"); 353 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 354 // the call analysis (callee structure) specifies that the call is optimized 355 // (either because of CHA or the static target is final) 356 // At code generation time, this call has been emitted as static call 357 // Call via stub 358 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); 359 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); 360 methodHandle method (thread, (Method*)info.cached_metadata()); 361 csc->set_to_interpreted(method, info.entry()); 362 if (TraceICs) { 363 ResourceMark rm(thread); 364 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", 365 instruction_address(), 366 method->print_value_string()); 367 } 368 } else { 369 // Call via method-klass-holder 370 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); 371 if (TraceICs) { 372 ResourceMark rm(thread); 373 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); 374 } 375 } 376 } else { 377 // Call to compiled code 378 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); 379 #ifdef ASSERT 380 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); 381 assert (cb->is_nmethod(), "must be compiled!"); 382 #endif /* ASSERT */ 383 384 // This is MT safe if we come from a clean-cache and go through a 385 // non-verified entry point 386 bool safe = SafepointSynchronize::is_at_safepoint() || 387 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); 388 389 if (!safe) { 390 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); 391 } else { 392 if (is_optimized()) { 393 set_ic_destination(info.entry()); 394 } else { 395 set_ic_destination_and_value(info.entry(), info.cached_metadata()); 396 } 397 } 398 399 if (TraceICs) { 400 ResourceMark rm(thread); 401 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); 402 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", 403 instruction_address(), 404 ((Klass*)info.cached_metadata())->print_value_string(), 405 (safe) ? "" : "via stub"); 406 } 407 } 408 // We can't check this anymore. With lazy deopt we could have already 409 // cleaned this IC entry before we even return. This is possible if 410 // we ran out of space in the inline cache buffer trying to do the 411 // set_next and we safepointed to free up space. This is a benign 412 // race because the IC entry was complete when we safepointed so 413 // cleaning it immediately is harmless. 414 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 415 } 416 417 418 // is_optimized: Compiler has generated an optimized call (i.e., no inline 419 // cache) static_bound: The call can be static bound (i.e, no need to use 420 // inline cache) 421 void CompiledIC::compute_monomorphic_entry(methodHandle method, 422 KlassHandle receiver_klass, 423 bool is_optimized, 424 bool static_bound, 425 CompiledICInfo& info, 426 TRAPS) { 427 nmethod* method_code = method->code(); 428 address entry = NULL; 429 if (method_code != NULL) { 430 // Call to compiled code 431 if (static_bound || is_optimized) { 432 entry = method_code->verified_entry_point(); 433 } else { 434 entry = method_code->entry_point(); 435 } 436 } 437 if (entry != NULL) { 438 // Call to compiled code 439 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); 440 } else { 441 // Note: the following problem exists with Compiler1: 442 // - at compile time we may or may not know if the destination is final 443 // - if we know that the destination is final, we will emit an optimized 444 // virtual call (no inline cache), and need a Method* to make a call 445 // to the interpreter 446 // - if we do not know if the destination is final, we emit a standard 447 // virtual call, and use CompiledICHolder to call interpreted code 448 // (no static call stub has been generated) 449 // However in that case we will now notice it is static_bound 450 // and convert the call into what looks to be an optimized 451 // virtual call. This causes problems in verifying the IC because 452 // it look vanilla but is optimized. Code in is_call_to_interpreted 453 // is aware of this and weakens its asserts. 454 455 // static_bound should imply is_optimized -- otherwise we have a 456 // performance bug (statically-bindable method is called via 457 // dynamically-dispatched call note: the reverse implication isn't 458 // necessarily true -- the call may have been optimized based on compiler 459 // analysis (static_bound is only based on "final" etc.) 460 #ifdef COMPILER2 461 #ifdef TIERED 462 #if defined(ASSERT) 463 // can't check the assert because we don't have the CompiledIC with which to 464 // find the address if the call instruction. 465 // 466 // CodeBlob* cb = find_blob_unsafe(instruction_address()); 467 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); 468 #endif // ASSERT 469 #else 470 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); 471 #endif // TIERED 472 #endif // COMPILER2 473 if (is_optimized) { 474 // Use stub entry 475 info.set_interpreter_entry(method()->get_c2i_entry(), method()); 476 } else { 477 // Use icholder entry 478 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); 479 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); 480 } 481 } 482 assert(info.is_optimized() == is_optimized, "must agree"); 483 } 484 485 486 bool CompiledIC::is_icholder_entry(address entry) { 487 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); 488 return (cb != NULL && cb->is_adapter_blob()); 489 } 490 491 492 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) 493 : _ic_call(call) 494 { 495 address ic_call = call->instruction_address(); 496 497 assert(ic_call != NULL, "ic_call address must be set"); 498 assert(nm != NULL, "must pass nmethod"); 499 assert(nm->contains(ic_call), "must be in nmethod"); 500 501 // search for the ic_call at the given address 502 RelocIterator iter(nm, ic_call, ic_call+1); 503 bool ret = iter.next(); 504 assert(ret == true, "relocInfo must exist at this address"); 505 assert(iter.addr() == ic_call, "must find ic_call"); 506 if (iter.type() == relocInfo::virtual_call_type) { 507 virtual_call_Relocation* r = iter.virtual_call_reloc(); 508 _is_optimized = false; 509 _value = nativeMovConstReg_at(r->cached_value()); 510 } else { 511 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); 512 _is_optimized = true; 513 _value = NULL; 514 } 515 } 516 517 518 // ---------------------------------------------------------------------------- 519 520 void CompiledStaticCall::set_to_clean() { 521 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 522 // Reset call site 523 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 524 #ifdef ASSERT 525 CodeBlob* cb = CodeCache::find_blob_unsafe(this); 526 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); 527 #endif 528 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); 529 530 // Do not reset stub here: It is too expensive to call find_stub. 531 // Instead, rely on caller (nmethod::clear_inline_caches) to clear 532 // both the call and its stub. 533 } 534 535 536 bool CompiledStaticCall::is_clean() const { 537 return destination() == SharedRuntime::get_resolve_static_call_stub(); 538 } 539 540 bool CompiledStaticCall::is_call_to_compiled() const { 541 return CodeCache::contains(destination()); 542 } 543 544 545 bool CompiledStaticCall::is_call_to_interpreted() const { 546 // It is a call to interpreted, if it calls to a stub. Hence, the destination 547 // must be in the stub part of the nmethod that contains the call 548 nmethod* nm = CodeCache::find_nmethod(instruction_address()); 549 return nm->stub_contains(destination()); 550 } 551 552 553 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { 554 address stub=find_stub(); 555 assert(stub!=NULL, "stub not found"); 556 557 if (TraceICs) { 558 ResourceMark rm; 559 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", 560 instruction_address(), 561 callee->name_and_sig_as_C_string()); 562 } 563 564 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset); // creation also verifies the object 565 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 566 567 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); 568 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); 569 570 // Update stub 571 method_holder->set_data((intptr_t)callee()); 572 jump->set_jump_destination(entry); 573 574 // Update jump to call 575 set_destination_mt_safe(stub); 576 } 577 578 579 void CompiledStaticCall::set(const StaticCallInfo& info) { 580 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 581 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 582 // Updating a cache to the wrong entry can cause bugs that are very hard 583 // to track down - if cache entry gets invalid - we just clean it. In 584 // this way it is always the same code path that is responsible for 585 // updating and resolving an inline cache 586 assert(is_clean(), "do not update a call entry - use clean"); 587 588 if (info._to_interpreter) { 589 // Call to interpreted code 590 set_to_interpreted(info.callee(), info.entry()); 591 } else { 592 if (TraceICs) { 593 ResourceMark rm; 594 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, 595 instruction_address(), 596 info.entry()); 597 } 598 // Call to compiled code 599 assert (CodeCache::contains(info.entry()), "wrong entry point"); 600 set_destination_mt_safe(info.entry()); 601 } 602 } 603 604 605 // Compute settings for a CompiledStaticCall. Since we might have to set 606 // the stub when calling to the interpreter, we need to return arguments. 607 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { 608 nmethod* m_code = m->code(); 609 info._callee = m; 610 if (m_code != NULL) { 611 info._to_interpreter = false; 612 info._entry = m_code->verified_entry_point(); 613 } else { 614 // Callee is interpreted code. In any case entering the interpreter 615 // puts a converter-frame on the stack to save arguments. 616 info._to_interpreter = true; 617 info._entry = m()->get_c2i_entry(); 618 } 619 } 620 621 622 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { 623 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 624 // Reset stub 625 address stub = static_stub->addr(); 626 assert(stub!=NULL, "stub not found"); 627 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset); // creation also verifies the object 628 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 629 method_holder->set_data(0); 630 jump->set_jump_destination((address)-1); 631 } 632 633 634 address CompiledStaticCall::find_stub() { 635 // Find reloc. information containing this call-site 636 RelocIterator iter((nmethod*)NULL, instruction_address()); 637 while (iter.next()) { 638 if (iter.addr() == instruction_address()) { 639 switch(iter.type()) { 640 case relocInfo::static_call_type: 641 return iter.static_call_reloc()->static_stub(); 642 // We check here for opt_virtual_call_type, since we reuse the code 643 // from the CompiledIC implementation 644 case relocInfo::opt_virtual_call_type: 645 return iter.opt_virtual_call_reloc()->static_stub(); 646 case relocInfo::poll_type: 647 case relocInfo::poll_return_type: // A safepoint can't overlap a call. 648 default: 649 ShouldNotReachHere(); 650 } 651 } 652 } 653 return NULL; 654 } 655 656 657 //----------------------------------------------------------------------------- 658 // Non-product mode code 659 #ifndef PRODUCT 660 661 void CompiledIC::verify() { 662 // make sure code pattern is actually a call imm32 instruction 663 _ic_call->verify(); 664 if (os::is_MP()) { 665 _ic_call->verify_alignment(); 666 } 667 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() 668 || is_optimized() || is_megamorphic(), "sanity check"); 669 } 670 671 672 void CompiledIC::print() { 673 print_compiled_ic(); 674 tty->cr(); 675 } 676 677 678 void CompiledIC::print_compiled_ic() { 679 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, 680 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); 681 } 682 683 684 void CompiledStaticCall::print() { 685 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); 686 if (is_clean()) { 687 tty->print("clean"); 688 } else if (is_call_to_compiled()) { 689 tty->print("compiled"); 690 } else if (is_call_to_interpreted()) { 691 tty->print("interpreted"); 692 } 693 tty->cr(); 694 } 695 696 void CompiledStaticCall::verify() { 697 // Verify call 698 NativeCall::verify(); 699 if (os::is_MP()) { 700 verify_alignment(); 701 } 702 703 // Verify stub 704 address stub = find_stub(); 705 assert(stub != NULL, "no stub found for static call"); 706 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset); // creation also verifies the object 707 708 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 709 710 // Verify state 711 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 712 } 713 714 #endif // !PRODUCT 715 716 #ifndef COMPILER2 717 const int CompiledStaticCall::comp_to_int_load_offset = 0; 718 #endif