1 /* 2 * Copyright (c) 1999, 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 "asm/codeBuffer.hpp" 27 #include "c1/c1_CodeStubs.hpp" 28 #include "c1/c1_Defs.hpp" 29 #include "c1/c1_FrameMap.hpp" 30 #include "c1/c1_LIRAssembler.hpp" 31 #include "c1/c1_MacroAssembler.hpp" 32 #include "c1/c1_Runtime1.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmSymbols.hpp" 35 #include "code/codeBlob.hpp" 36 #include "code/compiledIC.hpp" 37 #include "code/pcDesc.hpp" 38 #include "code/scopeDesc.hpp" 39 #include "code/vtableStubs.hpp" 40 #include "compiler/disassembler.hpp" 41 #include "gc/shared/barrierSet.hpp" 42 #include "gc/shared/c1/barrierSetC1.hpp" 43 #include "gc/shared/collectedHeap.hpp" 44 #include "interpreter/bytecode.hpp" 45 #include "interpreter/interpreter.hpp" 46 #include "logging/log.hpp" 47 #include "memory/allocation.inline.hpp" 48 #include "memory/oopFactory.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "oops/access.inline.hpp" 51 #include "oops/objArrayOop.inline.hpp" 52 #include "oops/objArrayKlass.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "runtime/atomic.hpp" 55 #include "runtime/biasedLocking.hpp" 56 #include "runtime/compilationPolicy.hpp" 57 #include "runtime/interfaceSupport.inline.hpp" 58 #include "runtime/frame.inline.hpp" 59 #include "runtime/javaCalls.hpp" 60 #include "runtime/sharedRuntime.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/vframe.inline.hpp" 63 #include "runtime/vframeArray.hpp" 64 #include "runtime/vm_version.hpp" 65 #include "utilities/copy.hpp" 66 #include "utilities/events.hpp" 67 68 69 // Implementation of StubAssembler 70 71 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) { 72 _name = name; 73 _must_gc_arguments = false; 74 _frame_size = no_frame_size; 75 _num_rt_args = 0; 76 _stub_id = stub_id; 77 } 78 79 80 void StubAssembler::set_info(const char* name, bool must_gc_arguments) { 81 _name = name; 82 _must_gc_arguments = must_gc_arguments; 83 } 84 85 86 void StubAssembler::set_frame_size(int size) { 87 if (_frame_size == no_frame_size) { 88 _frame_size = size; 89 } 90 assert(_frame_size == size, "can't change the frame size"); 91 } 92 93 94 void StubAssembler::set_num_rt_args(int args) { 95 if (_num_rt_args == 0) { 96 _num_rt_args = args; 97 } 98 assert(_num_rt_args == args, "can't change the number of args"); 99 } 100 101 // Implementation of Runtime1 102 103 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids]; 104 const char *Runtime1::_blob_names[] = { 105 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME) 106 }; 107 108 #ifndef PRODUCT 109 // statistics 110 int Runtime1::_generic_arraycopy_cnt = 0; 111 int Runtime1::_generic_arraycopystub_cnt = 0; 112 int Runtime1::_arraycopy_slowcase_cnt = 0; 113 int Runtime1::_arraycopy_checkcast_cnt = 0; 114 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0; 115 int Runtime1::_new_type_array_slowcase_cnt = 0; 116 int Runtime1::_new_object_array_slowcase_cnt = 0; 117 int Runtime1::_new_instance_slowcase_cnt = 0; 118 int Runtime1::_new_multi_array_slowcase_cnt = 0; 119 int Runtime1::_monitorenter_slowcase_cnt = 0; 120 int Runtime1::_monitorexit_slowcase_cnt = 0; 121 int Runtime1::_patch_code_slowcase_cnt = 0; 122 int Runtime1::_throw_range_check_exception_count = 0; 123 int Runtime1::_throw_index_exception_count = 0; 124 int Runtime1::_throw_div0_exception_count = 0; 125 int Runtime1::_throw_null_pointer_exception_count = 0; 126 int Runtime1::_throw_class_cast_exception_count = 0; 127 int Runtime1::_throw_incompatible_class_change_error_count = 0; 128 int Runtime1::_throw_array_store_exception_count = 0; 129 int Runtime1::_throw_count = 0; 130 131 static int _byte_arraycopy_stub_cnt = 0; 132 static int _short_arraycopy_stub_cnt = 0; 133 static int _int_arraycopy_stub_cnt = 0; 134 static int _long_arraycopy_stub_cnt = 0; 135 static int _oop_arraycopy_stub_cnt = 0; 136 137 address Runtime1::arraycopy_count_address(BasicType type) { 138 switch (type) { 139 case T_BOOLEAN: 140 case T_BYTE: return (address)&_byte_arraycopy_stub_cnt; 141 case T_CHAR: 142 case T_SHORT: return (address)&_short_arraycopy_stub_cnt; 143 case T_FLOAT: 144 case T_INT: return (address)&_int_arraycopy_stub_cnt; 145 case T_DOUBLE: 146 case T_LONG: return (address)&_long_arraycopy_stub_cnt; 147 case T_ARRAY: 148 case T_OBJECT: return (address)&_oop_arraycopy_stub_cnt; 149 default: 150 ShouldNotReachHere(); 151 return NULL; 152 } 153 } 154 155 156 #endif 157 158 // Simple helper to see if the caller of a runtime stub which 159 // entered the VM has been deoptimized 160 161 static bool caller_is_deopted() { 162 JavaThread* thread = JavaThread::current(); 163 RegisterMap reg_map(thread, false); 164 frame runtime_frame = thread->last_frame(); 165 frame caller_frame = runtime_frame.sender(®_map); 166 assert(caller_frame.is_compiled_frame(), "must be compiled"); 167 return caller_frame.is_deoptimized_frame(); 168 } 169 170 // Stress deoptimization 171 static void deopt_caller() { 172 if ( !caller_is_deopted()) { 173 JavaThread* thread = JavaThread::current(); 174 RegisterMap reg_map(thread, false); 175 frame runtime_frame = thread->last_frame(); 176 frame caller_frame = runtime_frame.sender(®_map); 177 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 178 assert(caller_is_deopted(), "Must be deoptimized"); 179 } 180 } 181 182 class StubIDStubAssemblerCodeGenClosure: public StubAssemblerCodeGenClosure { 183 private: 184 Runtime1::StubID _id; 185 public: 186 StubIDStubAssemblerCodeGenClosure(Runtime1::StubID id) : _id(id) {} 187 virtual OopMapSet* generate_code(StubAssembler* sasm) { 188 return Runtime1::generate_code_for(_id, sasm); 189 } 190 }; 191 192 CodeBlob* Runtime1::generate_blob(BufferBlob* buffer_blob, int stub_id, const char* name, bool expect_oop_map, StubAssemblerCodeGenClosure* cl) { 193 ResourceMark rm; 194 // create code buffer for code storage 195 CodeBuffer code(buffer_blob); 196 197 OopMapSet* oop_maps; 198 int frame_size; 199 bool must_gc_arguments; 200 201 Compilation::setup_code_buffer(&code, 0); 202 203 // create assembler for code generation 204 StubAssembler* sasm = new StubAssembler(&code, name, stub_id); 205 // generate code for runtime stub 206 oop_maps = cl->generate_code(sasm); 207 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size, 208 "if stub has an oop map it must have a valid frame size"); 209 assert(!expect_oop_map || oop_maps != NULL, "must have an oopmap"); 210 211 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned) 212 sasm->align(BytesPerWord); 213 // make sure all code is in code buffer 214 sasm->flush(); 215 216 frame_size = sasm->frame_size(); 217 must_gc_arguments = sasm->must_gc_arguments(); 218 // create blob - distinguish a few special cases 219 CodeBlob* blob = RuntimeStub::new_runtime_stub(name, 220 &code, 221 CodeOffsets::frame_never_safe, 222 frame_size, 223 oop_maps, 224 must_gc_arguments); 225 assert(blob != NULL, "blob must exist"); 226 return blob; 227 } 228 229 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) { 230 assert(0 <= id && id < number_of_ids, "illegal stub id"); 231 bool expect_oop_map = true; 232 #ifdef ASSERT 233 // Make sure that stubs that need oopmaps have them 234 switch (id) { 235 // These stubs don't need to have an oopmap 236 case dtrace_object_alloc_id: 237 case slow_subtype_check_id: 238 case fpu2long_stub_id: 239 case unwind_exception_id: 240 case counter_overflow_id: 241 #if defined(SPARC) || defined(PPC32) 242 case handle_exception_nofpu_id: // Unused on sparc 243 #endif 244 expect_oop_map = false; 245 break; 246 default: 247 break; 248 } 249 #endif 250 StubIDStubAssemblerCodeGenClosure cl(id); 251 CodeBlob* blob = generate_blob(buffer_blob, id, name_for(id), expect_oop_map, &cl); 252 // install blob 253 _blobs[id] = blob; 254 } 255 256 void Runtime1::initialize(BufferBlob* blob) { 257 // platform-dependent initialization 258 initialize_pd(); 259 // generate stubs 260 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id); 261 // printing 262 #ifndef PRODUCT 263 if (PrintSimpleStubs) { 264 ResourceMark rm; 265 for (int id = 0; id < number_of_ids; id++) { 266 _blobs[id]->print(); 267 if (_blobs[id]->oop_maps() != NULL) { 268 _blobs[id]->oop_maps()->print(); 269 } 270 } 271 } 272 #endif 273 BarrierSetC1* bs = BarrierSet::barrier_set()->barrier_set_c1(); 274 bs->generate_c1_runtime_stubs(blob); 275 } 276 277 CodeBlob* Runtime1::blob_for(StubID id) { 278 assert(0 <= id && id < number_of_ids, "illegal stub id"); 279 return _blobs[id]; 280 } 281 282 283 const char* Runtime1::name_for(StubID id) { 284 assert(0 <= id && id < number_of_ids, "illegal stub id"); 285 return _blob_names[id]; 286 } 287 288 const char* Runtime1::name_for_address(address entry) { 289 for (int id = 0; id < number_of_ids; id++) { 290 if (entry == entry_for((StubID)id)) return name_for((StubID)id); 291 } 292 293 #define FUNCTION_CASE(a, f) \ 294 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f 295 296 FUNCTION_CASE(entry, os::javaTimeMillis); 297 FUNCTION_CASE(entry, os::javaTimeNanos); 298 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end); 299 FUNCTION_CASE(entry, SharedRuntime::d2f); 300 FUNCTION_CASE(entry, SharedRuntime::d2i); 301 FUNCTION_CASE(entry, SharedRuntime::d2l); 302 FUNCTION_CASE(entry, SharedRuntime::dcos); 303 FUNCTION_CASE(entry, SharedRuntime::dexp); 304 FUNCTION_CASE(entry, SharedRuntime::dlog); 305 FUNCTION_CASE(entry, SharedRuntime::dlog10); 306 FUNCTION_CASE(entry, SharedRuntime::dpow); 307 FUNCTION_CASE(entry, SharedRuntime::drem); 308 FUNCTION_CASE(entry, SharedRuntime::dsin); 309 FUNCTION_CASE(entry, SharedRuntime::dtan); 310 FUNCTION_CASE(entry, SharedRuntime::f2i); 311 FUNCTION_CASE(entry, SharedRuntime::f2l); 312 FUNCTION_CASE(entry, SharedRuntime::frem); 313 FUNCTION_CASE(entry, SharedRuntime::l2d); 314 FUNCTION_CASE(entry, SharedRuntime::l2f); 315 FUNCTION_CASE(entry, SharedRuntime::ldiv); 316 FUNCTION_CASE(entry, SharedRuntime::lmul); 317 FUNCTION_CASE(entry, SharedRuntime::lrem); 318 FUNCTION_CASE(entry, SharedRuntime::lrem); 319 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry); 320 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit); 321 FUNCTION_CASE(entry, is_instance_of); 322 FUNCTION_CASE(entry, trace_block_entry); 323 #ifdef TRACE_HAVE_INTRINSICS 324 FUNCTION_CASE(entry, TRACE_TIME_METHOD); 325 #endif 326 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32()); 327 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32C()); 328 FUNCTION_CASE(entry, StubRoutines::vectorizedMismatch()); 329 FUNCTION_CASE(entry, StubRoutines::dexp()); 330 FUNCTION_CASE(entry, StubRoutines::dlog()); 331 FUNCTION_CASE(entry, StubRoutines::dlog10()); 332 FUNCTION_CASE(entry, StubRoutines::dpow()); 333 FUNCTION_CASE(entry, StubRoutines::dsin()); 334 FUNCTION_CASE(entry, StubRoutines::dcos()); 335 FUNCTION_CASE(entry, StubRoutines::dtan()); 336 337 #undef FUNCTION_CASE 338 339 // Soft float adds more runtime names. 340 return pd_name_for_address(entry); 341 } 342 343 344 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass)) 345 NOT_PRODUCT(_new_instance_slowcase_cnt++;) 346 347 assert(klass->is_klass(), "not a class"); 348 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 349 InstanceKlass* h = InstanceKlass::cast(klass); 350 h->check_valid_for_instantiation(true, CHECK); 351 // make sure klass is initialized 352 h->initialize(CHECK); 353 // allocate instance and return via TLS 354 oop obj = h->allocate_instance(CHECK); 355 thread->set_vm_result(obj); 356 JRT_END 357 358 359 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length)) 360 NOT_PRODUCT(_new_type_array_slowcase_cnt++;) 361 // Note: no handle for klass needed since they are not used 362 // anymore after new_typeArray() and no GC can happen before. 363 // (This may have to change if this code changes!) 364 assert(klass->is_klass(), "not a class"); 365 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type(); 366 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK); 367 thread->set_vm_result(obj); 368 // This is pretty rare but this runtime patch is stressful to deoptimization 369 // if we deoptimize here so force a deopt to stress the path. 370 if (DeoptimizeALot) { 371 deopt_caller(); 372 } 373 374 JRT_END 375 376 377 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length)) 378 NOT_PRODUCT(_new_object_array_slowcase_cnt++;) 379 380 // Note: no handle for klass needed since they are not used 381 // anymore after new_objArray() and no GC can happen before. 382 // (This may have to change if this code changes!) 383 assert(array_klass->is_klass(), "not a class"); 384 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive 385 Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass(); 386 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK); 387 thread->set_vm_result(obj); 388 // This is pretty rare but this runtime patch is stressful to deoptimization 389 // if we deoptimize here so force a deopt to stress the path. 390 if (DeoptimizeALot) { 391 deopt_caller(); 392 } 393 JRT_END 394 395 396 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims)) 397 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;) 398 399 assert(klass->is_klass(), "not a class"); 400 assert(rank >= 1, "rank must be nonzero"); 401 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 402 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK); 403 thread->set_vm_result(obj); 404 JRT_END 405 406 407 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id)) 408 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id); 409 JRT_END 410 411 412 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj)) 413 ResourceMark rm(thread); 414 const char* klass_name = obj->klass()->external_name(); 415 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name); 416 JRT_END 417 418 419 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method 420 // associated with the top activation record. The inlinee (that is possibly included in the enclosing 421 // method) method oop is passed as an argument. In order to do that it is embedded in the code as 422 // a constant. 423 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) { 424 nmethod* osr_nm = NULL; 425 methodHandle method(THREAD, m); 426 427 RegisterMap map(THREAD, false); 428 frame fr = THREAD->last_frame().sender(&map); 429 nmethod* nm = (nmethod*) fr.cb(); 430 assert(nm!= NULL && nm->is_nmethod(), "Sanity check"); 431 methodHandle enclosing_method(THREAD, nm->method()); 432 433 CompLevel level = (CompLevel)nm->comp_level(); 434 int bci = InvocationEntryBci; 435 if (branch_bci != InvocationEntryBci) { 436 // Compute destination bci 437 address pc = method()->code_base() + branch_bci; 438 Bytecodes::Code branch = Bytecodes::code_at(method(), pc); 439 int offset = 0; 440 switch (branch) { 441 case Bytecodes::_if_icmplt: case Bytecodes::_iflt: 442 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt: 443 case Bytecodes::_if_icmple: case Bytecodes::_ifle: 444 case Bytecodes::_if_icmpge: case Bytecodes::_ifge: 445 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq: 446 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne: 447 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto: 448 offset = (int16_t)Bytes::get_Java_u2(pc + 1); 449 break; 450 case Bytecodes::_goto_w: 451 offset = Bytes::get_Java_u4(pc + 1); 452 break; 453 default: ; 454 } 455 bci = branch_bci + offset; 456 } 457 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending"); 458 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD); 459 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions"); 460 return osr_nm; 461 } 462 463 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method)) 464 nmethod* osr_nm; 465 JRT_BLOCK 466 osr_nm = counter_overflow_helper(thread, bci, method); 467 if (osr_nm != NULL) { 468 RegisterMap map(thread, false); 469 frame fr = thread->last_frame().sender(&map); 470 Deoptimization::deoptimize_frame(thread, fr.id()); 471 } 472 JRT_BLOCK_END 473 return NULL; 474 JRT_END 475 476 extern void vm_exit(int code); 477 478 // Enter this method from compiled code handler below. This is where we transition 479 // to VM mode. This is done as a helper routine so that the method called directly 480 // from compiled code does not have to transition to VM. This allows the entry 481 // method to see if the nmethod that we have just looked up a handler for has 482 // been deoptimized while we were in the vm. This simplifies the assembly code 483 // cpu directories. 484 // 485 // We are entering here from exception stub (via the entry method below) 486 // If there is a compiled exception handler in this method, we will continue there; 487 // otherwise we will unwind the stack and continue at the caller of top frame method 488 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to 489 // control the area where we can allow a safepoint. After we exit the safepoint area we can 490 // check to see if the handler we are going to return is now in a nmethod that has 491 // been deoptimized. If that is the case we return the deopt blob 492 // unpack_with_exception entry instead. This makes life for the exception blob easier 493 // because making that same check and diverting is painful from assembly language. 494 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm)) 495 // Reset method handle flag. 496 thread->set_is_method_handle_return(false); 497 498 Handle exception(thread, ex); 499 nm = CodeCache::find_nmethod(pc); 500 assert(nm != NULL, "this is not an nmethod"); 501 // Adjust the pc as needed/ 502 if (nm->is_deopt_pc(pc)) { 503 RegisterMap map(thread, false); 504 frame exception_frame = thread->last_frame().sender(&map); 505 // if the frame isn't deopted then pc must not correspond to the caller of last_frame 506 assert(exception_frame.is_deoptimized_frame(), "must be deopted"); 507 pc = exception_frame.pc(); 508 } 509 #ifdef ASSERT 510 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception"); 511 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 512 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) { 513 if (ExitVMOnVerifyError) vm_exit(-1); 514 ShouldNotReachHere(); 515 } 516 #endif 517 518 // Check the stack guard pages and reenable them if necessary and there is 519 // enough space on the stack to do so. Use fast exceptions only if the guard 520 // pages are enabled. 521 bool guard_pages_enabled = thread->stack_guards_enabled(); 522 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 523 524 if (JvmtiExport::can_post_on_exceptions()) { 525 // To ensure correct notification of exception catches and throws 526 // we have to deoptimize here. If we attempted to notify the 527 // catches and throws during this exception lookup it's possible 528 // we could deoptimize on the way out of the VM and end back in 529 // the interpreter at the throw site. This would result in double 530 // notifications since the interpreter would also notify about 531 // these same catches and throws as it unwound the frame. 532 533 RegisterMap reg_map(thread); 534 frame stub_frame = thread->last_frame(); 535 frame caller_frame = stub_frame.sender(®_map); 536 537 // We don't really want to deoptimize the nmethod itself since we 538 // can actually continue in the exception handler ourselves but I 539 // don't see an easy way to have the desired effect. 540 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 541 assert(caller_is_deopted(), "Must be deoptimized"); 542 543 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 544 } 545 546 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions 547 if (guard_pages_enabled) { 548 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc); 549 if (fast_continuation != NULL) { 550 // Set flag if return address is a method handle call site. 551 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 552 return fast_continuation; 553 } 554 } 555 556 // If the stack guard pages are enabled, check whether there is a handler in 557 // the current method. Otherwise (guard pages disabled), force an unwind and 558 // skip the exception cache update (i.e., just leave continuation==NULL). 559 address continuation = NULL; 560 if (guard_pages_enabled) { 561 562 // New exception handling mechanism can support inlined methods 563 // with exception handlers since the mappings are from PC to PC 564 565 // debugging support 566 // tracing 567 if (log_is_enabled(Info, exceptions)) { 568 ResourceMark rm; 569 stringStream tempst; 570 tempst.print("compiled method <%s>\n" 571 " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT, 572 nm->method()->print_value_string(), p2i(pc), p2i(thread)); 573 Exceptions::log_exception(exception, tempst); 574 } 575 // for AbortVMOnException flag 576 Exceptions::debug_check_abort(exception); 577 578 // Clear out the exception oop and pc since looking up an 579 // exception handler can cause class loading, which might throw an 580 // exception and those fields are expected to be clear during 581 // normal bytecode execution. 582 thread->clear_exception_oop_and_pc(); 583 584 bool recursive_exception = false; 585 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception); 586 // If an exception was thrown during exception dispatch, the exception oop may have changed 587 thread->set_exception_oop(exception()); 588 thread->set_exception_pc(pc); 589 590 // the exception cache is used only by non-implicit exceptions 591 // Update the exception cache only when there didn't happen 592 // another exception during the computation of the compiled 593 // exception handler. Checking for exception oop equality is not 594 // sufficient because some exceptions are pre-allocated and reused. 595 if (continuation != NULL && !recursive_exception) { 596 nm->add_handler_for_exception_and_pc(exception, pc, continuation); 597 } 598 } 599 600 thread->set_vm_result(exception()); 601 // Set flag if return address is a method handle call site. 602 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 603 604 if (log_is_enabled(Info, exceptions)) { 605 ResourceMark rm; 606 log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT 607 " for exception thrown at PC " PTR_FORMAT, 608 p2i(thread), p2i(continuation), p2i(pc)); 609 } 610 611 return continuation; 612 JRT_END 613 614 // Enter this method from compiled code only if there is a Java exception handler 615 // in the method handling the exception. 616 // We are entering here from exception stub. We don't do a normal VM transition here. 617 // We do it in a helper. This is so we can check to see if the nmethod we have just 618 // searched for an exception handler has been deoptimized in the meantime. 619 address Runtime1::exception_handler_for_pc(JavaThread* thread) { 620 oop exception = thread->exception_oop(); 621 address pc = thread->exception_pc(); 622 // Still in Java mode 623 DEBUG_ONLY(ResetNoHandleMark rnhm); 624 nmethod* nm = NULL; 625 address continuation = NULL; 626 { 627 // Enter VM mode by calling the helper 628 ResetNoHandleMark rnhm; 629 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm); 630 } 631 // Back in JAVA, use no oops DON'T safepoint 632 633 // Now check to see if the nmethod we were called from is now deoptimized. 634 // If so we must return to the deopt blob and deoptimize the nmethod 635 if (nm != NULL && caller_is_deopted()) { 636 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 637 } 638 639 assert(continuation != NULL, "no handler found"); 640 return continuation; 641 } 642 643 644 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index, arrayOopDesc* a)) 645 NOT_PRODUCT(_throw_range_check_exception_count++;) 646 const int len = 35; 647 assert(len < strlen("Index %d out of bounds for length %d"), "Must allocate more space for message."); 648 char message[2 * jintAsStringSize + len]; 649 sprintf(message, "Index %d out of bounds for length %d", index, a->length()); 650 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message); 651 JRT_END 652 653 654 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index)) 655 NOT_PRODUCT(_throw_index_exception_count++;) 656 char message[16]; 657 sprintf(message, "%d", index); 658 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message); 659 JRT_END 660 661 662 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread)) 663 NOT_PRODUCT(_throw_div0_exception_count++;) 664 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 665 JRT_END 666 667 668 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread)) 669 NOT_PRODUCT(_throw_null_pointer_exception_count++;) 670 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 671 JRT_END 672 673 674 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object)) 675 NOT_PRODUCT(_throw_class_cast_exception_count++;) 676 ResourceMark rm(thread); 677 char* message = SharedRuntime::generate_class_cast_message( 678 thread, object->klass()); 679 SharedRuntime::throw_and_post_jvmti_exception( 680 thread, vmSymbols::java_lang_ClassCastException(), message); 681 JRT_END 682 683 684 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread)) 685 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;) 686 ResourceMark rm(thread); 687 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError()); 688 JRT_END 689 690 691 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock)) 692 NOT_PRODUCT(_monitorenter_slowcase_cnt++;) 693 if (PrintBiasedLockingStatistics) { 694 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 695 } 696 Handle h_obj(thread, obj); 697 if (UseBiasedLocking) { 698 // Retry fast entry if bias is revoked to avoid unnecessary inflation 699 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK); 700 } else { 701 if (UseFastLocking) { 702 // When using fast locking, the compiled code has already tried the fast case 703 assert(obj == lock->obj(), "must match"); 704 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD); 705 } else { 706 lock->set_obj(obj); 707 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD); 708 } 709 } 710 JRT_END 711 712 713 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock)) 714 NOT_PRODUCT(_monitorexit_slowcase_cnt++;) 715 assert(thread == JavaThread::current(), "threads must correspond"); 716 assert(thread->last_Java_sp(), "last_Java_sp must be set"); 717 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown 718 EXCEPTION_MARK; 719 720 oop obj = lock->obj(); 721 assert(oopDesc::is_oop(obj), "must be NULL or an object"); 722 if (UseFastLocking) { 723 // When using fast locking, the compiled code has already tried the fast case 724 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD); 725 } else { 726 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD); 727 } 728 JRT_END 729 730 // Cf. OptoRuntime::deoptimize_caller_frame 731 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread, jint trap_request)) 732 // Called from within the owner thread, so no need for safepoint 733 RegisterMap reg_map(thread, false); 734 frame stub_frame = thread->last_frame(); 735 assert(stub_frame.is_runtime_frame(), "Sanity check"); 736 frame caller_frame = stub_frame.sender(®_map); 737 nmethod* nm = caller_frame.cb()->as_nmethod_or_null(); 738 assert(nm != NULL, "Sanity check"); 739 methodHandle method(thread, nm->method()); 740 assert(nm == CodeCache::find_nmethod(caller_frame.pc()), "Should be the same"); 741 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); 742 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); 743 744 if (action == Deoptimization::Action_make_not_entrant) { 745 if (nm->make_not_entrant()) { 746 if (reason == Deoptimization::Reason_tenured) { 747 MethodData* trap_mdo = Deoptimization::get_method_data(thread, method, true /*create_if_missing*/); 748 if (trap_mdo != NULL) { 749 trap_mdo->inc_tenure_traps(); 750 } 751 } 752 } 753 } 754 755 // Deoptimize the caller frame. 756 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 757 // Return to the now deoptimized frame. 758 JRT_END 759 760 761 #ifndef DEOPTIMIZE_WHEN_PATCHING 762 763 static Klass* resolve_field_return_klass(const methodHandle& caller, int bci, TRAPS) { 764 Bytecode_field field_access(caller, bci); 765 // This can be static or non-static field access 766 Bytecodes::Code code = field_access.code(); 767 768 // We must load class, initialize class and resolve the field 769 fieldDescriptor result; // initialize class if needed 770 constantPoolHandle constants(THREAD, caller->constants()); 771 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller, Bytecodes::java_code(code), CHECK_NULL); 772 return result.field_holder(); 773 } 774 775 776 // 777 // This routine patches sites where a class wasn't loaded or 778 // initialized at the time the code was generated. It handles 779 // references to classes, fields and forcing of initialization. Most 780 // of the cases are straightforward and involving simply forcing 781 // resolution of a class, rewriting the instruction stream with the 782 // needed constant and replacing the call in this function with the 783 // patched code. The case for static field is more complicated since 784 // the thread which is in the process of initializing a class can 785 // access it's static fields but other threads can't so the code 786 // either has to deoptimize when this case is detected or execute a 787 // check that the current thread is the initializing thread. The 788 // current 789 // 790 // Patches basically look like this: 791 // 792 // 793 // patch_site: jmp patch stub ;; will be patched 794 // continue: ... 795 // ... 796 // ... 797 // ... 798 // 799 // They have a stub which looks like this: 800 // 801 // ;; patch body 802 // movl <const>, reg (for class constants) 803 // <or> movl [reg1 + <const>], reg (for field offsets) 804 // <or> movl reg, [reg1 + <const>] (for field offsets) 805 // <being_init offset> <bytes to copy> <bytes to skip> 806 // patch_stub: call Runtime1::patch_code (through a runtime stub) 807 // jmp patch_site 808 // 809 // 810 // A normal patch is done by rewriting the patch body, usually a move, 811 // and then copying it into place over top of the jmp instruction 812 // being careful to flush caches and doing it in an MP-safe way. The 813 // constants following the patch body are used to find various pieces 814 // of the patch relative to the call site for Runtime1::patch_code. 815 // The case for getstatic and putstatic is more complicated because 816 // getstatic and putstatic have special semantics when executing while 817 // the class is being initialized. getstatic/putstatic on a class 818 // which is being_initialized may be executed by the initializing 819 // thread but other threads have to block when they execute it. This 820 // is accomplished in compiled code by executing a test of the current 821 // thread against the initializing thread of the class. It's emitted 822 // as boilerplate in their stub which allows the patched code to be 823 // executed before it's copied back into the main body of the nmethod. 824 // 825 // being_init: get_thread(<tmp reg> 826 // cmpl [reg1 + <init_thread_offset>], <tmp reg> 827 // jne patch_stub 828 // movl [reg1 + <const>], reg (for field offsets) <or> 829 // movl reg, [reg1 + <const>] (for field offsets) 830 // jmp continue 831 // <being_init offset> <bytes to copy> <bytes to skip> 832 // patch_stub: jmp Runtim1::patch_code (through a runtime stub) 833 // jmp patch_site 834 // 835 // If the class is being initialized the patch body is rewritten and 836 // the patch site is rewritten to jump to being_init, instead of 837 // patch_stub. Whenever this code is executed it checks the current 838 // thread against the intializing thread so other threads will enter 839 // the runtime and end up blocked waiting the class to finish 840 // initializing inside the calls to resolve_field below. The 841 // initializing class will continue on it's way. Once the class is 842 // fully_initialized, the intializing_thread of the class becomes 843 // NULL, so the next thread to execute this code will fail the test, 844 // call into patch_code and complete the patching process by copying 845 // the patch body back into the main part of the nmethod and resume 846 // executing. 847 // 848 // 849 850 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) 851 NOT_PRODUCT(_patch_code_slowcase_cnt++;) 852 853 ResourceMark rm(thread); 854 RegisterMap reg_map(thread, false); 855 frame runtime_frame = thread->last_frame(); 856 frame caller_frame = runtime_frame.sender(®_map); 857 858 // last java frame on stack 859 vframeStream vfst(thread, true); 860 assert(!vfst.at_end(), "Java frame must exist"); 861 862 methodHandle caller_method(THREAD, vfst.method()); 863 // Note that caller_method->code() may not be same as caller_code because of OSR's 864 // Note also that in the presence of inlining it is not guaranteed 865 // that caller_method() == caller_code->method() 866 867 int bci = vfst.bci(); 868 Bytecodes::Code code = caller_method()->java_code_at(bci); 869 870 // this is used by assertions in the access_field_patching_id 871 BasicType patch_field_type = T_ILLEGAL; 872 bool deoptimize_for_volatile = false; 873 bool deoptimize_for_atomic = false; 874 int patch_field_offset = -1; 875 Klass* init_klass = NULL; // klass needed by load_klass_patching code 876 Klass* load_klass = NULL; // klass needed by load_klass_patching code 877 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code 878 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code 879 bool load_klass_or_mirror_patch_id = 880 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id); 881 882 if (stub_id == Runtime1::access_field_patching_id) { 883 884 Bytecode_field field_access(caller_method, bci); 885 fieldDescriptor result; // initialize class if needed 886 Bytecodes::Code code = field_access.code(); 887 constantPoolHandle constants(THREAD, caller_method->constants()); 888 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller_method, Bytecodes::java_code(code), CHECK); 889 patch_field_offset = result.offset(); 890 891 // If we're patching a field which is volatile then at compile it 892 // must not have been know to be volatile, so the generated code 893 // isn't correct for a volatile reference. The nmethod has to be 894 // deoptimized so that the code can be regenerated correctly. 895 // This check is only needed for access_field_patching since this 896 // is the path for patching field offsets. load_klass is only 897 // used for patching references to oops which don't need special 898 // handling in the volatile case. 899 900 deoptimize_for_volatile = result.access_flags().is_volatile(); 901 902 // If we are patching a field which should be atomic, then 903 // the generated code is not correct either, force deoptimizing. 904 // We need to only cover T_LONG and T_DOUBLE fields, as we can 905 // break access atomicity only for them. 906 907 // Strictly speaking, the deoptimizaation on 64-bit platforms 908 // is unnecessary, and T_LONG stores on 32-bit platforms need 909 // to be handled by special patching code when AlwaysAtomicAccesses 910 // becomes product feature. At this point, we are still going 911 // for the deoptimization for consistency against volatile 912 // accesses. 913 914 patch_field_type = result.field_type(); 915 deoptimize_for_atomic = (AlwaysAtomicAccesses && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)); 916 917 } else if (load_klass_or_mirror_patch_id) { 918 Klass* k = NULL; 919 switch (code) { 920 case Bytecodes::_putstatic: 921 case Bytecodes::_getstatic: 922 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK); 923 init_klass = klass; 924 mirror = Handle(THREAD, klass->java_mirror()); 925 } 926 break; 927 case Bytecodes::_new: 928 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci)); 929 k = caller_method->constants()->klass_at(bnew.index(), CHECK); 930 } 931 break; 932 case Bytecodes::_multianewarray: 933 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci)); 934 k = caller_method->constants()->klass_at(mna.index(), CHECK); 935 } 936 break; 937 case Bytecodes::_instanceof: 938 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci)); 939 k = caller_method->constants()->klass_at(io.index(), CHECK); 940 } 941 break; 942 case Bytecodes::_checkcast: 943 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci)); 944 k = caller_method->constants()->klass_at(cc.index(), CHECK); 945 } 946 break; 947 case Bytecodes::_anewarray: 948 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci)); 949 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK); 950 k = ek->array_klass(CHECK); 951 } 952 break; 953 case Bytecodes::_ldc: 954 case Bytecodes::_ldc_w: 955 { 956 Bytecode_loadconstant cc(caller_method, bci); 957 oop m = cc.resolve_constant(CHECK); 958 mirror = Handle(THREAD, m); 959 } 960 break; 961 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id"); 962 } 963 load_klass = k; 964 } else if (stub_id == load_appendix_patching_id) { 965 Bytecode_invoke bytecode(caller_method, bci); 966 Bytecodes::Code bc = bytecode.invoke_code(); 967 968 CallInfo info; 969 constantPoolHandle pool(thread, caller_method->constants()); 970 int index = bytecode.index(); 971 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK); 972 switch (bc) { 973 case Bytecodes::_invokehandle: { 974 int cache_index = ConstantPool::decode_cpcache_index(index, true); 975 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index"); 976 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index); 977 cpce->set_method_handle(pool, info); 978 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry 979 break; 980 } 981 case Bytecodes::_invokedynamic: { 982 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 983 cpce->set_dynamic_call(pool, info); 984 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry 985 break; 986 } 987 default: fatal("unexpected bytecode for load_appendix_patching_id"); 988 } 989 } else { 990 ShouldNotReachHere(); 991 } 992 993 if (deoptimize_for_volatile || deoptimize_for_atomic) { 994 // At compile time we assumed the field wasn't volatile/atomic but after 995 // loading it turns out it was volatile/atomic so we have to throw the 996 // compiled code out and let it be regenerated. 997 if (TracePatching) { 998 if (deoptimize_for_volatile) { 999 tty->print_cr("Deoptimizing for patching volatile field reference"); 1000 } 1001 if (deoptimize_for_atomic) { 1002 tty->print_cr("Deoptimizing for patching atomic field reference"); 1003 } 1004 } 1005 1006 // It's possible the nmethod was invalidated in the last 1007 // safepoint, but if it's still alive then make it not_entrant. 1008 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1009 if (nm != NULL) { 1010 nm->make_not_entrant(); 1011 } 1012 1013 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1014 1015 // Return to the now deoptimized frame. 1016 } 1017 1018 // Now copy code back 1019 1020 { 1021 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag); 1022 // 1023 // Deoptimization may have happened while we waited for the lock. 1024 // In that case we don't bother to do any patching we just return 1025 // and let the deopt happen 1026 if (!caller_is_deopted()) { 1027 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc()); 1028 address instr_pc = jump->jump_destination(); 1029 NativeInstruction* ni = nativeInstruction_at(instr_pc); 1030 if (ni->is_jump() ) { 1031 // the jump has not been patched yet 1032 // The jump destination is slow case and therefore not part of the stubs 1033 // (stubs are only for StaticCalls) 1034 1035 // format of buffer 1036 // .... 1037 // instr byte 0 <-- copy_buff 1038 // instr byte 1 1039 // .. 1040 // instr byte n-1 1041 // n 1042 // .... <-- call destination 1043 1044 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset(); 1045 unsigned char* byte_count = (unsigned char*) (stub_location - 1); 1046 unsigned char* byte_skip = (unsigned char*) (stub_location - 2); 1047 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3); 1048 address copy_buff = stub_location - *byte_skip - *byte_count; 1049 address being_initialized_entry = stub_location - *being_initialized_entry_offset; 1050 if (TracePatching) { 1051 ttyLocker ttyl; 1052 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci, 1053 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass"); 1054 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc()); 1055 assert(caller_code != NULL, "nmethod not found"); 1056 1057 // NOTE we use pc() not original_pc() because we already know they are 1058 // identical otherwise we'd have never entered this block of code 1059 1060 const ImmutableOopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc()); 1061 assert(map != NULL, "null check"); 1062 map->print(); 1063 tty->cr(); 1064 1065 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1066 } 1067 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod 1068 bool do_patch = true; 1069 if (stub_id == Runtime1::access_field_patching_id) { 1070 // The offset may not be correct if the class was not loaded at code generation time. 1071 // Set it now. 1072 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff); 1073 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type"); 1074 assert(patch_field_offset >= 0, "illegal offset"); 1075 n_move->add_offset_in_bytes(patch_field_offset); 1076 } else if (load_klass_or_mirror_patch_id) { 1077 // If a getstatic or putstatic is referencing a klass which 1078 // isn't fully initialized, the patch body isn't copied into 1079 // place until initialization is complete. In this case the 1080 // patch site is setup so that any threads besides the 1081 // initializing thread are forced to come into the VM and 1082 // block. 1083 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) || 1084 InstanceKlass::cast(init_klass)->is_initialized(); 1085 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc); 1086 if (jump->jump_destination() == being_initialized_entry) { 1087 assert(do_patch == true, "initialization must be complete at this point"); 1088 } else { 1089 // patch the instruction <move reg, klass> 1090 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1091 1092 assert(n_copy->data() == 0 || 1093 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1094 "illegal init value"); 1095 if (stub_id == Runtime1::load_klass_patching_id) { 1096 assert(load_klass != NULL, "klass not set"); 1097 n_copy->set_data((intx) (load_klass)); 1098 } else { 1099 assert(mirror() != NULL, "klass not set"); 1100 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop. 1101 n_copy->set_data(cast_from_oop<intx>(mirror())); 1102 } 1103 1104 if (TracePatching) { 1105 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1106 } 1107 } 1108 } else if (stub_id == Runtime1::load_appendix_patching_id) { 1109 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1110 assert(n_copy->data() == 0 || 1111 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1112 "illegal init value"); 1113 n_copy->set_data(cast_from_oop<intx>(appendix())); 1114 1115 if (TracePatching) { 1116 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1117 } 1118 } else { 1119 ShouldNotReachHere(); 1120 } 1121 1122 #if defined(SPARC) || defined(PPC32) 1123 if (load_klass_or_mirror_patch_id || 1124 stub_id == Runtime1::load_appendix_patching_id) { 1125 // Update the location in the nmethod with the proper 1126 // metadata. When the code was generated, a NULL was stuffed 1127 // in the metadata table and that table needs to be update to 1128 // have the right value. On intel the value is kept 1129 // directly in the instruction instead of in the metadata 1130 // table, so set_data above effectively updated the value. 1131 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1132 assert(nm != NULL, "invalid nmethod_pc"); 1133 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1134 bool found = false; 1135 while (mds.next() && !found) { 1136 if (mds.type() == relocInfo::oop_type) { 1137 assert(stub_id == Runtime1::load_mirror_patching_id || 1138 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1139 oop_Relocation* r = mds.oop_reloc(); 1140 oop* oop_adr = r->oop_addr(); 1141 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix(); 1142 r->fix_oop_relocation(); 1143 found = true; 1144 } else if (mds.type() == relocInfo::metadata_type) { 1145 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1146 metadata_Relocation* r = mds.metadata_reloc(); 1147 Metadata** metadata_adr = r->metadata_addr(); 1148 *metadata_adr = load_klass; 1149 r->fix_metadata_relocation(); 1150 found = true; 1151 } 1152 } 1153 assert(found, "the metadata must exist!"); 1154 } 1155 #endif 1156 if (do_patch) { 1157 // replace instructions 1158 // first replace the tail, then the call 1159 #ifdef ARM 1160 if((load_klass_or_mirror_patch_id || 1161 stub_id == Runtime1::load_appendix_patching_id) && 1162 nativeMovConstReg_at(copy_buff)->is_pc_relative()) { 1163 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1164 address addr = NULL; 1165 assert(nm != NULL, "invalid nmethod_pc"); 1166 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1167 while (mds.next()) { 1168 if (mds.type() == relocInfo::oop_type) { 1169 assert(stub_id == Runtime1::load_mirror_patching_id || 1170 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1171 oop_Relocation* r = mds.oop_reloc(); 1172 addr = (address)r->oop_addr(); 1173 break; 1174 } else if (mds.type() == relocInfo::metadata_type) { 1175 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1176 metadata_Relocation* r = mds.metadata_reloc(); 1177 addr = (address)r->metadata_addr(); 1178 break; 1179 } 1180 } 1181 assert(addr != NULL, "metadata relocation must exist"); 1182 copy_buff -= *byte_count; 1183 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff); 1184 n_copy2->set_pc_relative_offset(addr, instr_pc); 1185 } 1186 #endif 1187 1188 for (int i = NativeGeneralJump::instruction_size; i < *byte_count; i++) { 1189 address ptr = copy_buff + i; 1190 int a_byte = (*ptr) & 0xFF; 1191 address dst = instr_pc + i; 1192 *(unsigned char*)dst = (unsigned char) a_byte; 1193 } 1194 ICache::invalidate_range(instr_pc, *byte_count); 1195 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff); 1196 1197 if (load_klass_or_mirror_patch_id || 1198 stub_id == Runtime1::load_appendix_patching_id) { 1199 relocInfo::relocType rtype = 1200 (stub_id == Runtime1::load_klass_patching_id) ? 1201 relocInfo::metadata_type : 1202 relocInfo::oop_type; 1203 // update relocInfo to metadata 1204 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1205 assert(nm != NULL, "invalid nmethod_pc"); 1206 1207 // The old patch site is now a move instruction so update 1208 // the reloc info so that it will get updated during 1209 // future GCs. 1210 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1)); 1211 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc, 1212 relocInfo::none, rtype); 1213 #ifdef SPARC 1214 // Sparc takes two relocations for an metadata so update the second one. 1215 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset; 1216 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1217 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1218 relocInfo::none, rtype); 1219 #endif 1220 #ifdef PPC32 1221 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset; 1222 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1223 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1224 relocInfo::none, rtype); 1225 } 1226 #endif 1227 } 1228 1229 } else { 1230 ICache::invalidate_range(copy_buff, *byte_count); 1231 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry); 1232 } 1233 } 1234 } 1235 } 1236 1237 // If we are patching in a non-perm oop, make sure the nmethod 1238 // is on the right list. 1239 if (ScavengeRootsInCode) { 1240 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag); 1241 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1242 guarantee(nm != NULL, "only nmethods can contain non-perm oops"); 1243 1244 // Since we've patched some oops in the nmethod, 1245 // (re)register it with the heap. 1246 Universe::heap()->register_nmethod(nm); 1247 } 1248 JRT_END 1249 1250 #else // DEOPTIMIZE_WHEN_PATCHING 1251 1252 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) 1253 RegisterMap reg_map(thread, false); 1254 1255 NOT_PRODUCT(_patch_code_slowcase_cnt++;) 1256 if (TracePatching) { 1257 tty->print_cr("Deoptimizing because patch is needed"); 1258 } 1259 1260 frame runtime_frame = thread->last_frame(); 1261 frame caller_frame = runtime_frame.sender(®_map); 1262 1263 // It's possible the nmethod was invalidated in the last 1264 // safepoint, but if it's still alive then make it not_entrant. 1265 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1266 if (nm != NULL) { 1267 nm->make_not_entrant(); 1268 } 1269 1270 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1271 1272 // Return to the now deoptimized frame. 1273 JRT_END 1274 1275 #endif // DEOPTIMIZE_WHEN_PATCHING 1276 1277 // 1278 // Entry point for compiled code. We want to patch a nmethod. 1279 // We don't do a normal VM transition here because we want to 1280 // know after the patching is complete and any safepoint(s) are taken 1281 // if the calling nmethod was deoptimized. We do this by calling a 1282 // helper method which does the normal VM transition and when it 1283 // completes we can check for deoptimization. This simplifies the 1284 // assembly code in the cpu directories. 1285 // 1286 int Runtime1::move_klass_patching(JavaThread* thread) { 1287 // 1288 // NOTE: we are still in Java 1289 // 1290 Thread* THREAD = thread; 1291 debug_only(NoHandleMark nhm;) 1292 { 1293 // Enter VM mode 1294 1295 ResetNoHandleMark rnhm; 1296 patch_code(thread, load_klass_patching_id); 1297 } 1298 // Back in JAVA, use no oops DON'T safepoint 1299 1300 // Return true if calling code is deoptimized 1301 1302 return caller_is_deopted(); 1303 } 1304 1305 int Runtime1::move_mirror_patching(JavaThread* thread) { 1306 // 1307 // NOTE: we are still in Java 1308 // 1309 Thread* THREAD = thread; 1310 debug_only(NoHandleMark nhm;) 1311 { 1312 // Enter VM mode 1313 1314 ResetNoHandleMark rnhm; 1315 patch_code(thread, load_mirror_patching_id); 1316 } 1317 // Back in JAVA, use no oops DON'T safepoint 1318 1319 // Return true if calling code is deoptimized 1320 1321 return caller_is_deopted(); 1322 } 1323 1324 int Runtime1::move_appendix_patching(JavaThread* thread) { 1325 // 1326 // NOTE: we are still in Java 1327 // 1328 Thread* THREAD = thread; 1329 debug_only(NoHandleMark nhm;) 1330 { 1331 // Enter VM mode 1332 1333 ResetNoHandleMark rnhm; 1334 patch_code(thread, load_appendix_patching_id); 1335 } 1336 // Back in JAVA, use no oops DON'T safepoint 1337 1338 // Return true if calling code is deoptimized 1339 1340 return caller_is_deopted(); 1341 } 1342 // 1343 // Entry point for compiled code. We want to patch a nmethod. 1344 // We don't do a normal VM transition here because we want to 1345 // know after the patching is complete and any safepoint(s) are taken 1346 // if the calling nmethod was deoptimized. We do this by calling a 1347 // helper method which does the normal VM transition and when it 1348 // completes we can check for deoptimization. This simplifies the 1349 // assembly code in the cpu directories. 1350 // 1351 1352 int Runtime1::access_field_patching(JavaThread* thread) { 1353 // 1354 // NOTE: we are still in Java 1355 // 1356 Thread* THREAD = thread; 1357 debug_only(NoHandleMark nhm;) 1358 { 1359 // Enter VM mode 1360 1361 ResetNoHandleMark rnhm; 1362 patch_code(thread, access_field_patching_id); 1363 } 1364 // Back in JAVA, use no oops DON'T safepoint 1365 1366 // Return true if calling code is deoptimized 1367 1368 return caller_is_deopted(); 1369 JRT_END 1370 1371 1372 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id)) 1373 // for now we just print out the block id 1374 tty->print("%d ", block_id); 1375 JRT_END 1376 1377 1378 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj)) 1379 // had to return int instead of bool, otherwise there may be a mismatch 1380 // between the C calling convention and the Java one. 1381 // e.g., on x86, GCC may clear only %al when returning a bool false, but 1382 // JVM takes the whole %eax as the return value, which may misinterpret 1383 // the return value as a boolean true. 1384 1385 assert(mirror != NULL, "should null-check on mirror before calling"); 1386 Klass* k = java_lang_Class::as_Klass(mirror); 1387 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0; 1388 JRT_END 1389 1390 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread)) 1391 ResourceMark rm; 1392 1393 assert(!TieredCompilation, "incompatible with tiered compilation"); 1394 1395 RegisterMap reg_map(thread, false); 1396 frame runtime_frame = thread->last_frame(); 1397 frame caller_frame = runtime_frame.sender(®_map); 1398 1399 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1400 assert (nm != NULL, "no more nmethod?"); 1401 nm->make_not_entrant(); 1402 1403 methodHandle m(nm->method()); 1404 MethodData* mdo = m->method_data(); 1405 1406 if (mdo == NULL && !HAS_PENDING_EXCEPTION) { 1407 // Build an MDO. Ignore errors like OutOfMemory; 1408 // that simply means we won't have an MDO to update. 1409 Method::build_interpreter_method_data(m, THREAD); 1410 if (HAS_PENDING_EXCEPTION) { 1411 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 1412 CLEAR_PENDING_EXCEPTION; 1413 } 1414 mdo = m->method_data(); 1415 } 1416 1417 if (mdo != NULL) { 1418 mdo->inc_trap_count(Deoptimization::Reason_none); 1419 } 1420 1421 if (TracePredicateFailedTraps) { 1422 stringStream ss1, ss2; 1423 vframeStream vfst(thread); 1424 methodHandle inlinee = methodHandle(vfst.method()); 1425 inlinee->print_short_name(&ss1); 1426 m->print_short_name(&ss2); 1427 tty->print_cr("Predicate failed trap in method %s at bci %d inlined in %s at pc " INTPTR_FORMAT, ss1.as_string(), vfst.bci(), ss2.as_string(), p2i(caller_frame.pc())); 1428 } 1429 1430 1431 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1432 1433 JRT_END 1434 1435 #ifndef PRODUCT 1436 void Runtime1::print_statistics() { 1437 tty->print_cr("C1 Runtime statistics:"); 1438 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr); 1439 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr); 1440 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr); 1441 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr); 1442 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr); 1443 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt); 1444 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt); 1445 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_stub_cnt); 1446 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_stub_cnt); 1447 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_stub_cnt); 1448 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_stub_cnt); 1449 tty->print_cr(" _oop_arraycopy_cnt: %d", _oop_arraycopy_stub_cnt); 1450 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt); 1451 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt); 1452 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt); 1453 1454 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt); 1455 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt); 1456 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt); 1457 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt); 1458 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt); 1459 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt); 1460 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt); 1461 1462 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count); 1463 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count); 1464 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count); 1465 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count); 1466 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count); 1467 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count); 1468 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count); 1469 tty->print_cr(" _throw_count: %d:", _throw_count); 1470 1471 SharedRuntime::print_ic_miss_histogram(); 1472 tty->cr(); 1473 } 1474 #endif // PRODUCT