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/collectedHeap.hpp" 43 #include "interpreter/bytecode.hpp" 44 #include "interpreter/interpreter.hpp" 45 #include "logging/log.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/objArrayOop.inline.hpp" 51 #include "oops/objArrayKlass.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "runtime/atomic.hpp" 54 #include "runtime/biasedLocking.hpp" 55 #include "runtime/compilationPolicy.hpp" 56 #include "runtime/interfaceSupport.inline.hpp" 57 #include "runtime/frame.inline.hpp" 58 #include "runtime/javaCalls.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/vframe.inline.hpp" 62 #include "runtime/vframeArray.hpp" 63 #include "runtime/vm_version.hpp" 64 #include "utilities/copy.hpp" 65 #include "utilities/events.hpp" 66 67 68 // Implementation of StubAssembler 69 70 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) { 71 _name = name; 72 _must_gc_arguments = false; 73 _frame_size = no_frame_size; 74 _num_rt_args = 0; 75 _stub_id = stub_id; 76 } 77 78 79 void StubAssembler::set_info(const char* name, bool must_gc_arguments) { 80 _name = name; 81 _must_gc_arguments = must_gc_arguments; 82 } 83 84 85 void StubAssembler::set_frame_size(int size) { 86 if (_frame_size == no_frame_size) { 87 _frame_size = size; 88 } 89 assert(_frame_size == size, "can't change the frame size"); 90 } 91 92 93 void StubAssembler::set_num_rt_args(int args) { 94 if (_num_rt_args == 0) { 95 _num_rt_args = args; 96 } 97 assert(_num_rt_args == args, "can't change the number of args"); 98 } 99 100 // Implementation of Runtime1 101 102 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids]; 103 const char *Runtime1::_blob_names[] = { 104 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME) 105 }; 106 107 #ifndef PRODUCT 108 // statistics 109 int Runtime1::_generic_arraycopy_cnt = 0; 110 int Runtime1::_generic_arraycopystub_cnt = 0; 111 int Runtime1::_arraycopy_slowcase_cnt = 0; 112 int Runtime1::_arraycopy_checkcast_cnt = 0; 113 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0; 114 int Runtime1::_new_type_array_slowcase_cnt = 0; 115 int Runtime1::_new_object_array_slowcase_cnt = 0; 116 int Runtime1::_new_instance_slowcase_cnt = 0; 117 int Runtime1::_new_multi_array_slowcase_cnt = 0; 118 int Runtime1::_monitorenter_slowcase_cnt = 0; 119 int Runtime1::_monitorexit_slowcase_cnt = 0; 120 int Runtime1::_patch_code_slowcase_cnt = 0; 121 int Runtime1::_throw_range_check_exception_count = 0; 122 int Runtime1::_throw_index_exception_count = 0; 123 int Runtime1::_throw_div0_exception_count = 0; 124 int Runtime1::_throw_null_pointer_exception_count = 0; 125 int Runtime1::_throw_class_cast_exception_count = 0; 126 int Runtime1::_throw_incompatible_class_change_error_count = 0; 127 int Runtime1::_throw_array_store_exception_count = 0; 128 int Runtime1::_throw_count = 0; 129 130 static int _byte_arraycopy_stub_cnt = 0; 131 static int _short_arraycopy_stub_cnt = 0; 132 static int _int_arraycopy_stub_cnt = 0; 133 static int _long_arraycopy_stub_cnt = 0; 134 static int _oop_arraycopy_stub_cnt = 0; 135 136 address Runtime1::arraycopy_count_address(BasicType type) { 137 switch (type) { 138 case T_BOOLEAN: 139 case T_BYTE: return (address)&_byte_arraycopy_stub_cnt; 140 case T_CHAR: 141 case T_SHORT: return (address)&_short_arraycopy_stub_cnt; 142 case T_FLOAT: 143 case T_INT: return (address)&_int_arraycopy_stub_cnt; 144 case T_DOUBLE: 145 case T_LONG: return (address)&_long_arraycopy_stub_cnt; 146 case T_ARRAY: 147 case T_OBJECT: return (address)&_oop_arraycopy_stub_cnt; 148 default: 149 ShouldNotReachHere(); 150 return NULL; 151 } 152 } 153 154 155 #endif 156 157 // Simple helper to see if the caller of a runtime stub which 158 // entered the VM has been deoptimized 159 160 static bool caller_is_deopted() { 161 JavaThread* thread = JavaThread::current(); 162 RegisterMap reg_map(thread, false); 163 frame runtime_frame = thread->last_frame(); 164 frame caller_frame = runtime_frame.sender(®_map); 165 assert(caller_frame.is_compiled_frame(), "must be compiled"); 166 return caller_frame.is_deoptimized_frame(); 167 } 168 169 // Stress deoptimization 170 static void deopt_caller() { 171 if ( !caller_is_deopted()) { 172 JavaThread* thread = JavaThread::current(); 173 RegisterMap reg_map(thread, false); 174 frame runtime_frame = thread->last_frame(); 175 frame caller_frame = runtime_frame.sender(®_map); 176 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 177 assert(caller_is_deopted(), "Must be deoptimized"); 178 } 179 } 180 181 182 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) { 183 assert(0 <= id && id < number_of_ids, "illegal stub id"); 184 ResourceMark rm; 185 // create code buffer for code storage 186 CodeBuffer code(buffer_blob); 187 188 OopMapSet* oop_maps; 189 int frame_size; 190 bool must_gc_arguments; 191 192 Compilation::setup_code_buffer(&code, 0); 193 194 // create assembler for code generation 195 StubAssembler* sasm = new StubAssembler(&code, name_for(id), id); 196 // generate code for runtime stub 197 oop_maps = generate_code_for(id, sasm); 198 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size, 199 "if stub has an oop map it must have a valid frame size"); 200 201 #ifdef ASSERT 202 // Make sure that stubs that need oopmaps have them 203 switch (id) { 204 // These stubs don't need to have an oopmap 205 case dtrace_object_alloc_id: 206 case g1_pre_barrier_slow_id: 207 case g1_post_barrier_slow_id: 208 case slow_subtype_check_id: 209 case fpu2long_stub_id: 210 case unwind_exception_id: 211 case counter_overflow_id: 212 #if defined(SPARC) || defined(PPC32) 213 case handle_exception_nofpu_id: // Unused on sparc 214 #endif 215 break; 216 217 // All other stubs should have oopmaps 218 default: 219 assert(oop_maps != NULL, "must have an oopmap"); 220 } 221 #endif 222 223 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned) 224 sasm->align(BytesPerWord); 225 // make sure all code is in code buffer 226 sasm->flush(); 227 228 frame_size = sasm->frame_size(); 229 must_gc_arguments = sasm->must_gc_arguments(); 230 // create blob - distinguish a few special cases 231 CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id), 232 &code, 233 CodeOffsets::frame_never_safe, 234 frame_size, 235 oop_maps, 236 must_gc_arguments); 237 // install blob 238 assert(blob != NULL, "blob must exist"); 239 _blobs[id] = blob; 240 } 241 242 243 void Runtime1::initialize(BufferBlob* blob) { 244 // platform-dependent initialization 245 initialize_pd(); 246 // generate stubs 247 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id); 248 // printing 249 #ifndef PRODUCT 250 if (PrintSimpleStubs) { 251 ResourceMark rm; 252 for (int id = 0; id < number_of_ids; id++) { 253 _blobs[id]->print(); 254 if (_blobs[id]->oop_maps() != NULL) { 255 _blobs[id]->oop_maps()->print(); 256 } 257 } 258 } 259 #endif 260 } 261 262 263 CodeBlob* Runtime1::blob_for(StubID id) { 264 assert(0 <= id && id < number_of_ids, "illegal stub id"); 265 return _blobs[id]; 266 } 267 268 269 const char* Runtime1::name_for(StubID id) { 270 assert(0 <= id && id < number_of_ids, "illegal stub id"); 271 return _blob_names[id]; 272 } 273 274 const char* Runtime1::name_for_address(address entry) { 275 for (int id = 0; id < number_of_ids; id++) { 276 if (entry == entry_for((StubID)id)) return name_for((StubID)id); 277 } 278 279 #define FUNCTION_CASE(a, f) \ 280 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f 281 282 FUNCTION_CASE(entry, os::javaTimeMillis); 283 FUNCTION_CASE(entry, os::javaTimeNanos); 284 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end); 285 FUNCTION_CASE(entry, SharedRuntime::d2f); 286 FUNCTION_CASE(entry, SharedRuntime::d2i); 287 FUNCTION_CASE(entry, SharedRuntime::d2l); 288 FUNCTION_CASE(entry, SharedRuntime::dcos); 289 FUNCTION_CASE(entry, SharedRuntime::dexp); 290 FUNCTION_CASE(entry, SharedRuntime::dlog); 291 FUNCTION_CASE(entry, SharedRuntime::dlog10); 292 FUNCTION_CASE(entry, SharedRuntime::dpow); 293 FUNCTION_CASE(entry, SharedRuntime::drem); 294 FUNCTION_CASE(entry, SharedRuntime::dsin); 295 FUNCTION_CASE(entry, SharedRuntime::dtan); 296 FUNCTION_CASE(entry, SharedRuntime::f2i); 297 FUNCTION_CASE(entry, SharedRuntime::f2l); 298 FUNCTION_CASE(entry, SharedRuntime::frem); 299 FUNCTION_CASE(entry, SharedRuntime::l2d); 300 FUNCTION_CASE(entry, SharedRuntime::l2f); 301 FUNCTION_CASE(entry, SharedRuntime::ldiv); 302 FUNCTION_CASE(entry, SharedRuntime::lmul); 303 FUNCTION_CASE(entry, SharedRuntime::lrem); 304 FUNCTION_CASE(entry, SharedRuntime::lrem); 305 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry); 306 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit); 307 FUNCTION_CASE(entry, is_instance_of); 308 FUNCTION_CASE(entry, trace_block_entry); 309 #ifdef TRACE_HAVE_INTRINSICS 310 FUNCTION_CASE(entry, TRACE_TIME_METHOD); 311 #endif 312 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32()); 313 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32C()); 314 FUNCTION_CASE(entry, StubRoutines::vectorizedMismatch()); 315 FUNCTION_CASE(entry, StubRoutines::dexp()); 316 FUNCTION_CASE(entry, StubRoutines::dlog()); 317 FUNCTION_CASE(entry, StubRoutines::dlog10()); 318 FUNCTION_CASE(entry, StubRoutines::dpow()); 319 FUNCTION_CASE(entry, StubRoutines::dsin()); 320 FUNCTION_CASE(entry, StubRoutines::dcos()); 321 FUNCTION_CASE(entry, StubRoutines::dtan()); 322 323 #undef FUNCTION_CASE 324 325 // Soft float adds more runtime names. 326 return pd_name_for_address(entry); 327 } 328 329 330 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass)) 331 NOT_PRODUCT(_new_instance_slowcase_cnt++;) 332 333 assert(klass->is_klass(), "not a class"); 334 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 335 InstanceKlass* h = InstanceKlass::cast(klass); 336 h->check_valid_for_instantiation(true, CHECK); 337 // make sure klass is initialized 338 h->initialize(CHECK); 339 // allocate instance and return via TLS 340 oop obj = h->allocate_instance(CHECK); 341 thread->set_vm_result(obj); 342 JRT_END 343 344 345 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length)) 346 NOT_PRODUCT(_new_type_array_slowcase_cnt++;) 347 // Note: no handle for klass needed since they are not used 348 // anymore after new_typeArray() and no GC can happen before. 349 // (This may have to change if this code changes!) 350 assert(klass->is_klass(), "not a class"); 351 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type(); 352 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK); 353 thread->set_vm_result(obj); 354 // This is pretty rare but this runtime patch is stressful to deoptimization 355 // if we deoptimize here so force a deopt to stress the path. 356 if (DeoptimizeALot) { 357 deopt_caller(); 358 } 359 360 JRT_END 361 362 363 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length)) 364 NOT_PRODUCT(_new_object_array_slowcase_cnt++;) 365 366 // Note: no handle for klass needed since they are not used 367 // anymore after new_objArray() and no GC can happen before. 368 // (This may have to change if this code changes!) 369 assert(array_klass->is_klass(), "not a class"); 370 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive 371 Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass(); 372 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK); 373 thread->set_vm_result(obj); 374 // This is pretty rare but this runtime patch is stressful to deoptimization 375 // if we deoptimize here so force a deopt to stress the path. 376 if (DeoptimizeALot) { 377 deopt_caller(); 378 } 379 JRT_END 380 381 382 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims)) 383 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;) 384 385 assert(klass->is_klass(), "not a class"); 386 assert(rank >= 1, "rank must be nonzero"); 387 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 388 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK); 389 thread->set_vm_result(obj); 390 JRT_END 391 392 393 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id)) 394 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id); 395 JRT_END 396 397 398 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj)) 399 ResourceMark rm(thread); 400 const char* klass_name = obj->klass()->external_name(); 401 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name); 402 JRT_END 403 404 405 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method 406 // associated with the top activation record. The inlinee (that is possibly included in the enclosing 407 // method) method oop is passed as an argument. In order to do that it is embedded in the code as 408 // a constant. 409 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) { 410 nmethod* osr_nm = NULL; 411 methodHandle method(THREAD, m); 412 413 RegisterMap map(THREAD, false); 414 frame fr = THREAD->last_frame().sender(&map); 415 nmethod* nm = (nmethod*) fr.cb(); 416 assert(nm!= NULL && nm->is_nmethod(), "Sanity check"); 417 methodHandle enclosing_method(THREAD, nm->method()); 418 419 CompLevel level = (CompLevel)nm->comp_level(); 420 int bci = InvocationEntryBci; 421 if (branch_bci != InvocationEntryBci) { 422 // Compute destination bci 423 address pc = method()->code_base() + branch_bci; 424 Bytecodes::Code branch = Bytecodes::code_at(method(), pc); 425 int offset = 0; 426 switch (branch) { 427 case Bytecodes::_if_icmplt: case Bytecodes::_iflt: 428 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt: 429 case Bytecodes::_if_icmple: case Bytecodes::_ifle: 430 case Bytecodes::_if_icmpge: case Bytecodes::_ifge: 431 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq: 432 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne: 433 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto: 434 offset = (int16_t)Bytes::get_Java_u2(pc + 1); 435 break; 436 case Bytecodes::_goto_w: 437 offset = Bytes::get_Java_u4(pc + 1); 438 break; 439 default: ; 440 } 441 bci = branch_bci + offset; 442 } 443 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending"); 444 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD); 445 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions"); 446 return osr_nm; 447 } 448 449 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method)) 450 nmethod* osr_nm; 451 JRT_BLOCK 452 osr_nm = counter_overflow_helper(thread, bci, method); 453 if (osr_nm != NULL) { 454 RegisterMap map(thread, false); 455 frame fr = thread->last_frame().sender(&map); 456 Deoptimization::deoptimize_frame(thread, fr.id()); 457 } 458 JRT_BLOCK_END 459 return NULL; 460 JRT_END 461 462 extern void vm_exit(int code); 463 464 // Enter this method from compiled code handler below. This is where we transition 465 // to VM mode. This is done as a helper routine so that the method called directly 466 // from compiled code does not have to transition to VM. This allows the entry 467 // method to see if the nmethod that we have just looked up a handler for has 468 // been deoptimized while we were in the vm. This simplifies the assembly code 469 // cpu directories. 470 // 471 // We are entering here from exception stub (via the entry method below) 472 // If there is a compiled exception handler in this method, we will continue there; 473 // otherwise we will unwind the stack and continue at the caller of top frame method 474 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to 475 // control the area where we can allow a safepoint. After we exit the safepoint area we can 476 // check to see if the handler we are going to return is now in a nmethod that has 477 // been deoptimized. If that is the case we return the deopt blob 478 // unpack_with_exception entry instead. This makes life for the exception blob easier 479 // because making that same check and diverting is painful from assembly language. 480 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm)) 481 // Reset method handle flag. 482 thread->set_is_method_handle_return(false); 483 484 Handle exception(thread, ex); 485 nm = CodeCache::find_nmethod(pc); 486 assert(nm != NULL, "this is not an nmethod"); 487 // Adjust the pc as needed/ 488 if (nm->is_deopt_pc(pc)) { 489 RegisterMap map(thread, false); 490 frame exception_frame = thread->last_frame().sender(&map); 491 // if the frame isn't deopted then pc must not correspond to the caller of last_frame 492 assert(exception_frame.is_deoptimized_frame(), "must be deopted"); 493 pc = exception_frame.pc(); 494 } 495 #ifdef ASSERT 496 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception"); 497 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 498 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) { 499 if (ExitVMOnVerifyError) vm_exit(-1); 500 ShouldNotReachHere(); 501 } 502 #endif 503 504 // Check the stack guard pages and reenable them if necessary and there is 505 // enough space on the stack to do so. Use fast exceptions only if the guard 506 // pages are enabled. 507 bool guard_pages_enabled = thread->stack_guards_enabled(); 508 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 509 510 if (JvmtiExport::can_post_on_exceptions()) { 511 // To ensure correct notification of exception catches and throws 512 // we have to deoptimize here. If we attempted to notify the 513 // catches and throws during this exception lookup it's possible 514 // we could deoptimize on the way out of the VM and end back in 515 // the interpreter at the throw site. This would result in double 516 // notifications since the interpreter would also notify about 517 // these same catches and throws as it unwound the frame. 518 519 RegisterMap reg_map(thread); 520 frame stub_frame = thread->last_frame(); 521 frame caller_frame = stub_frame.sender(®_map); 522 523 // We don't really want to deoptimize the nmethod itself since we 524 // can actually continue in the exception handler ourselves but I 525 // don't see an easy way to have the desired effect. 526 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 527 assert(caller_is_deopted(), "Must be deoptimized"); 528 529 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 530 } 531 532 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions 533 if (guard_pages_enabled) { 534 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc); 535 if (fast_continuation != NULL) { 536 // Set flag if return address is a method handle call site. 537 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 538 return fast_continuation; 539 } 540 } 541 542 // If the stack guard pages are enabled, check whether there is a handler in 543 // the current method. Otherwise (guard pages disabled), force an unwind and 544 // skip the exception cache update (i.e., just leave continuation==NULL). 545 address continuation = NULL; 546 if (guard_pages_enabled) { 547 548 // New exception handling mechanism can support inlined methods 549 // with exception handlers since the mappings are from PC to PC 550 551 // debugging support 552 // tracing 553 if (log_is_enabled(Info, exceptions)) { 554 ResourceMark rm; 555 stringStream tempst; 556 tempst.print("compiled method <%s>\n" 557 " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT, 558 nm->method()->print_value_string(), p2i(pc), p2i(thread)); 559 Exceptions::log_exception(exception, tempst); 560 } 561 // for AbortVMOnException flag 562 Exceptions::debug_check_abort(exception); 563 564 // Clear out the exception oop and pc since looking up an 565 // exception handler can cause class loading, which might throw an 566 // exception and those fields are expected to be clear during 567 // normal bytecode execution. 568 thread->clear_exception_oop_and_pc(); 569 570 bool recursive_exception = false; 571 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception); 572 // If an exception was thrown during exception dispatch, the exception oop may have changed 573 thread->set_exception_oop(exception()); 574 thread->set_exception_pc(pc); 575 576 // the exception cache is used only by non-implicit exceptions 577 // Update the exception cache only when there didn't happen 578 // another exception during the computation of the compiled 579 // exception handler. Checking for exception oop equality is not 580 // sufficient because some exceptions are pre-allocated and reused. 581 if (continuation != NULL && !recursive_exception) { 582 nm->add_handler_for_exception_and_pc(exception, pc, continuation); 583 } 584 } 585 586 thread->set_vm_result(exception()); 587 // Set flag if return address is a method handle call site. 588 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 589 590 if (log_is_enabled(Info, exceptions)) { 591 ResourceMark rm; 592 log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT 593 " for exception thrown at PC " PTR_FORMAT, 594 p2i(thread), p2i(continuation), p2i(pc)); 595 } 596 597 return continuation; 598 JRT_END 599 600 // Enter this method from compiled code only if there is a Java exception handler 601 // in the method handling the exception. 602 // We are entering here from exception stub. We don't do a normal VM transition here. 603 // We do it in a helper. This is so we can check to see if the nmethod we have just 604 // searched for an exception handler has been deoptimized in the meantime. 605 address Runtime1::exception_handler_for_pc(JavaThread* thread) { 606 oop exception = thread->exception_oop(); 607 address pc = thread->exception_pc(); 608 // Still in Java mode 609 DEBUG_ONLY(ResetNoHandleMark rnhm); 610 nmethod* nm = NULL; 611 address continuation = NULL; 612 { 613 // Enter VM mode by calling the helper 614 ResetNoHandleMark rnhm; 615 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm); 616 } 617 // Back in JAVA, use no oops DON'T safepoint 618 619 // Now check to see if the nmethod we were called from is now deoptimized. 620 // If so we must return to the deopt blob and deoptimize the nmethod 621 if (nm != NULL && caller_is_deopted()) { 622 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 623 } 624 625 assert(continuation != NULL, "no handler found"); 626 return continuation; 627 } 628 629 630 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index, arrayOopDesc* a)) 631 NOT_PRODUCT(_throw_range_check_exception_count++;) 632 JavaCallArguments args; 633 args.push_int(index); 634 args.push_int(a->length()); 635 THROW_ARG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), vmSymbols::int_int_void_signature(), &args); 636 JRT_END 637 638 639 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index)) 640 NOT_PRODUCT(_throw_index_exception_count++;) 641 char message[16]; 642 sprintf(message, "%d", index); 643 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message); 644 JRT_END 645 646 647 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread)) 648 NOT_PRODUCT(_throw_div0_exception_count++;) 649 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 650 JRT_END 651 652 653 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread)) 654 NOT_PRODUCT(_throw_null_pointer_exception_count++;) 655 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 656 JRT_END 657 658 659 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object)) 660 NOT_PRODUCT(_throw_class_cast_exception_count++;) 661 ResourceMark rm(thread); 662 char* message = SharedRuntime::generate_class_cast_message( 663 thread, object->klass()); 664 SharedRuntime::throw_and_post_jvmti_exception( 665 thread, vmSymbols::java_lang_ClassCastException(), message); 666 JRT_END 667 668 669 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread)) 670 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;) 671 ResourceMark rm(thread); 672 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError()); 673 JRT_END 674 675 676 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock)) 677 NOT_PRODUCT(_monitorenter_slowcase_cnt++;) 678 if (PrintBiasedLockingStatistics) { 679 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 680 } 681 Handle h_obj(thread, obj); 682 if (UseBiasedLocking) { 683 // Retry fast entry if bias is revoked to avoid unnecessary inflation 684 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK); 685 } else { 686 if (UseFastLocking) { 687 // When using fast locking, the compiled code has already tried the fast case 688 assert(obj == lock->obj(), "must match"); 689 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD); 690 } else { 691 lock->set_obj(obj); 692 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD); 693 } 694 } 695 JRT_END 696 697 698 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock)) 699 NOT_PRODUCT(_monitorexit_slowcase_cnt++;) 700 assert(thread == JavaThread::current(), "threads must correspond"); 701 assert(thread->last_Java_sp(), "last_Java_sp must be set"); 702 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown 703 EXCEPTION_MARK; 704 705 oop obj = lock->obj(); 706 assert(oopDesc::is_oop(obj), "must be NULL or an object"); 707 if (UseFastLocking) { 708 // When using fast locking, the compiled code has already tried the fast case 709 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD); 710 } else { 711 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD); 712 } 713 JRT_END 714 715 // Cf. OptoRuntime::deoptimize_caller_frame 716 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread, jint trap_request)) 717 // Called from within the owner thread, so no need for safepoint 718 RegisterMap reg_map(thread, false); 719 frame stub_frame = thread->last_frame(); 720 assert(stub_frame.is_runtime_frame(), "Sanity check"); 721 frame caller_frame = stub_frame.sender(®_map); 722 nmethod* nm = caller_frame.cb()->as_nmethod_or_null(); 723 assert(nm != NULL, "Sanity check"); 724 methodHandle method(thread, nm->method()); 725 assert(nm == CodeCache::find_nmethod(caller_frame.pc()), "Should be the same"); 726 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); 727 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); 728 729 if (action == Deoptimization::Action_make_not_entrant) { 730 if (nm->make_not_entrant()) { 731 if (reason == Deoptimization::Reason_tenured) { 732 MethodData* trap_mdo = Deoptimization::get_method_data(thread, method, true /*create_if_missing*/); 733 if (trap_mdo != NULL) { 734 trap_mdo->inc_tenure_traps(); 735 } 736 } 737 } 738 } 739 740 // Deoptimize the caller frame. 741 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 742 // Return to the now deoptimized frame. 743 JRT_END 744 745 746 #ifndef DEOPTIMIZE_WHEN_PATCHING 747 748 static Klass* resolve_field_return_klass(const methodHandle& caller, int bci, TRAPS) { 749 Bytecode_field field_access(caller, bci); 750 // This can be static or non-static field access 751 Bytecodes::Code code = field_access.code(); 752 753 // We must load class, initialize class and resolve the field 754 fieldDescriptor result; // initialize class if needed 755 constantPoolHandle constants(THREAD, caller->constants()); 756 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller, Bytecodes::java_code(code), CHECK_NULL); 757 return result.field_holder(); 758 } 759 760 761 // 762 // This routine patches sites where a class wasn't loaded or 763 // initialized at the time the code was generated. It handles 764 // references to classes, fields and forcing of initialization. Most 765 // of the cases are straightforward and involving simply forcing 766 // resolution of a class, rewriting the instruction stream with the 767 // needed constant and replacing the call in this function with the 768 // patched code. The case for static field is more complicated since 769 // the thread which is in the process of initializing a class can 770 // access it's static fields but other threads can't so the code 771 // either has to deoptimize when this case is detected or execute a 772 // check that the current thread is the initializing thread. The 773 // current 774 // 775 // Patches basically look like this: 776 // 777 // 778 // patch_site: jmp patch stub ;; will be patched 779 // continue: ... 780 // ... 781 // ... 782 // ... 783 // 784 // They have a stub which looks like this: 785 // 786 // ;; patch body 787 // movl <const>, reg (for class constants) 788 // <or> movl [reg1 + <const>], reg (for field offsets) 789 // <or> movl reg, [reg1 + <const>] (for field offsets) 790 // <being_init offset> <bytes to copy> <bytes to skip> 791 // patch_stub: call Runtime1::patch_code (through a runtime stub) 792 // jmp patch_site 793 // 794 // 795 // A normal patch is done by rewriting the patch body, usually a move, 796 // and then copying it into place over top of the jmp instruction 797 // being careful to flush caches and doing it in an MP-safe way. The 798 // constants following the patch body are used to find various pieces 799 // of the patch relative to the call site for Runtime1::patch_code. 800 // The case for getstatic and putstatic is more complicated because 801 // getstatic and putstatic have special semantics when executing while 802 // the class is being initialized. getstatic/putstatic on a class 803 // which is being_initialized may be executed by the initializing 804 // thread but other threads have to block when they execute it. This 805 // is accomplished in compiled code by executing a test of the current 806 // thread against the initializing thread of the class. It's emitted 807 // as boilerplate in their stub which allows the patched code to be 808 // executed before it's copied back into the main body of the nmethod. 809 // 810 // being_init: get_thread(<tmp reg> 811 // cmpl [reg1 + <init_thread_offset>], <tmp reg> 812 // jne patch_stub 813 // movl [reg1 + <const>], reg (for field offsets) <or> 814 // movl reg, [reg1 + <const>] (for field offsets) 815 // jmp continue 816 // <being_init offset> <bytes to copy> <bytes to skip> 817 // patch_stub: jmp Runtim1::patch_code (through a runtime stub) 818 // jmp patch_site 819 // 820 // If the class is being initialized the patch body is rewritten and 821 // the patch site is rewritten to jump to being_init, instead of 822 // patch_stub. Whenever this code is executed it checks the current 823 // thread against the intializing thread so other threads will enter 824 // the runtime and end up blocked waiting the class to finish 825 // initializing inside the calls to resolve_field below. The 826 // initializing class will continue on it's way. Once the class is 827 // fully_initialized, the intializing_thread of the class becomes 828 // NULL, so the next thread to execute this code will fail the test, 829 // call into patch_code and complete the patching process by copying 830 // the patch body back into the main part of the nmethod and resume 831 // executing. 832 // 833 // 834 835 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) 836 NOT_PRODUCT(_patch_code_slowcase_cnt++;) 837 838 ResourceMark rm(thread); 839 RegisterMap reg_map(thread, false); 840 frame runtime_frame = thread->last_frame(); 841 frame caller_frame = runtime_frame.sender(®_map); 842 843 // last java frame on stack 844 vframeStream vfst(thread, true); 845 assert(!vfst.at_end(), "Java frame must exist"); 846 847 methodHandle caller_method(THREAD, vfst.method()); 848 // Note that caller_method->code() may not be same as caller_code because of OSR's 849 // Note also that in the presence of inlining it is not guaranteed 850 // that caller_method() == caller_code->method() 851 852 int bci = vfst.bci(); 853 Bytecodes::Code code = caller_method()->java_code_at(bci); 854 855 // this is used by assertions in the access_field_patching_id 856 BasicType patch_field_type = T_ILLEGAL; 857 bool deoptimize_for_volatile = false; 858 bool deoptimize_for_atomic = false; 859 int patch_field_offset = -1; 860 Klass* init_klass = NULL; // klass needed by load_klass_patching code 861 Klass* load_klass = NULL; // klass needed by load_klass_patching code 862 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code 863 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code 864 bool load_klass_or_mirror_patch_id = 865 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id); 866 867 if (stub_id == Runtime1::access_field_patching_id) { 868 869 Bytecode_field field_access(caller_method, bci); 870 fieldDescriptor result; // initialize class if needed 871 Bytecodes::Code code = field_access.code(); 872 constantPoolHandle constants(THREAD, caller_method->constants()); 873 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller_method, Bytecodes::java_code(code), CHECK); 874 patch_field_offset = result.offset(); 875 876 // If we're patching a field which is volatile then at compile it 877 // must not have been know to be volatile, so the generated code 878 // isn't correct for a volatile reference. The nmethod has to be 879 // deoptimized so that the code can be regenerated correctly. 880 // This check is only needed for access_field_patching since this 881 // is the path for patching field offsets. load_klass is only 882 // used for patching references to oops which don't need special 883 // handling in the volatile case. 884 885 deoptimize_for_volatile = result.access_flags().is_volatile(); 886 887 // If we are patching a field which should be atomic, then 888 // the generated code is not correct either, force deoptimizing. 889 // We need to only cover T_LONG and T_DOUBLE fields, as we can 890 // break access atomicity only for them. 891 892 // Strictly speaking, the deoptimizaation on 64-bit platforms 893 // is unnecessary, and T_LONG stores on 32-bit platforms need 894 // to be handled by special patching code when AlwaysAtomicAccesses 895 // becomes product feature. At this point, we are still going 896 // for the deoptimization for consistency against volatile 897 // accesses. 898 899 patch_field_type = result.field_type(); 900 deoptimize_for_atomic = (AlwaysAtomicAccesses && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)); 901 902 } else if (load_klass_or_mirror_patch_id) { 903 Klass* k = NULL; 904 switch (code) { 905 case Bytecodes::_putstatic: 906 case Bytecodes::_getstatic: 907 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK); 908 init_klass = klass; 909 mirror = Handle(THREAD, klass->java_mirror()); 910 } 911 break; 912 case Bytecodes::_new: 913 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci)); 914 k = caller_method->constants()->klass_at(bnew.index(), CHECK); 915 } 916 break; 917 case Bytecodes::_multianewarray: 918 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci)); 919 k = caller_method->constants()->klass_at(mna.index(), CHECK); 920 } 921 break; 922 case Bytecodes::_instanceof: 923 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci)); 924 k = caller_method->constants()->klass_at(io.index(), CHECK); 925 } 926 break; 927 case Bytecodes::_checkcast: 928 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci)); 929 k = caller_method->constants()->klass_at(cc.index(), CHECK); 930 } 931 break; 932 case Bytecodes::_anewarray: 933 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci)); 934 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK); 935 k = ek->array_klass(CHECK); 936 } 937 break; 938 case Bytecodes::_ldc: 939 case Bytecodes::_ldc_w: 940 { 941 Bytecode_loadconstant cc(caller_method, bci); 942 oop m = cc.resolve_constant(CHECK); 943 mirror = Handle(THREAD, m); 944 } 945 break; 946 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id"); 947 } 948 load_klass = k; 949 } else if (stub_id == load_appendix_patching_id) { 950 Bytecode_invoke bytecode(caller_method, bci); 951 Bytecodes::Code bc = bytecode.invoke_code(); 952 953 CallInfo info; 954 constantPoolHandle pool(thread, caller_method->constants()); 955 int index = bytecode.index(); 956 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK); 957 switch (bc) { 958 case Bytecodes::_invokehandle: { 959 int cache_index = ConstantPool::decode_cpcache_index(index, true); 960 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index"); 961 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index); 962 cpce->set_method_handle(pool, info); 963 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry 964 break; 965 } 966 case Bytecodes::_invokedynamic: { 967 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index); 968 cpce->set_dynamic_call(pool, info); 969 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry 970 break; 971 } 972 default: fatal("unexpected bytecode for load_appendix_patching_id"); 973 } 974 } else { 975 ShouldNotReachHere(); 976 } 977 978 if (deoptimize_for_volatile || deoptimize_for_atomic) { 979 // At compile time we assumed the field wasn't volatile/atomic but after 980 // loading it turns out it was volatile/atomic so we have to throw the 981 // compiled code out and let it be regenerated. 982 if (TracePatching) { 983 if (deoptimize_for_volatile) { 984 tty->print_cr("Deoptimizing for patching volatile field reference"); 985 } 986 if (deoptimize_for_atomic) { 987 tty->print_cr("Deoptimizing for patching atomic field reference"); 988 } 989 } 990 991 // It's possible the nmethod was invalidated in the last 992 // safepoint, but if it's still alive then make it not_entrant. 993 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 994 if (nm != NULL) { 995 nm->make_not_entrant(); 996 } 997 998 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 999 1000 // Return to the now deoptimized frame. 1001 } 1002 1003 // Now copy code back 1004 1005 { 1006 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag); 1007 // 1008 // Deoptimization may have happened while we waited for the lock. 1009 // In that case we don't bother to do any patching we just return 1010 // and let the deopt happen 1011 if (!caller_is_deopted()) { 1012 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc()); 1013 address instr_pc = jump->jump_destination(); 1014 NativeInstruction* ni = nativeInstruction_at(instr_pc); 1015 if (ni->is_jump() ) { 1016 // the jump has not been patched yet 1017 // The jump destination is slow case and therefore not part of the stubs 1018 // (stubs are only for StaticCalls) 1019 1020 // format of buffer 1021 // .... 1022 // instr byte 0 <-- copy_buff 1023 // instr byte 1 1024 // .. 1025 // instr byte n-1 1026 // n 1027 // .... <-- call destination 1028 1029 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset(); 1030 unsigned char* byte_count = (unsigned char*) (stub_location - 1); 1031 unsigned char* byte_skip = (unsigned char*) (stub_location - 2); 1032 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3); 1033 address copy_buff = stub_location - *byte_skip - *byte_count; 1034 address being_initialized_entry = stub_location - *being_initialized_entry_offset; 1035 if (TracePatching) { 1036 ttyLocker ttyl; 1037 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci, 1038 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass"); 1039 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc()); 1040 assert(caller_code != NULL, "nmethod not found"); 1041 1042 // NOTE we use pc() not original_pc() because we already know they are 1043 // identical otherwise we'd have never entered this block of code 1044 1045 const ImmutableOopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc()); 1046 assert(map != NULL, "null check"); 1047 map->print(); 1048 tty->cr(); 1049 1050 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1051 } 1052 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod 1053 bool do_patch = true; 1054 if (stub_id == Runtime1::access_field_patching_id) { 1055 // The offset may not be correct if the class was not loaded at code generation time. 1056 // Set it now. 1057 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff); 1058 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type"); 1059 assert(patch_field_offset >= 0, "illegal offset"); 1060 n_move->add_offset_in_bytes(patch_field_offset); 1061 } else if (load_klass_or_mirror_patch_id) { 1062 // If a getstatic or putstatic is referencing a klass which 1063 // isn't fully initialized, the patch body isn't copied into 1064 // place until initialization is complete. In this case the 1065 // patch site is setup so that any threads besides the 1066 // initializing thread are forced to come into the VM and 1067 // block. 1068 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) || 1069 InstanceKlass::cast(init_klass)->is_initialized(); 1070 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc); 1071 if (jump->jump_destination() == being_initialized_entry) { 1072 assert(do_patch == true, "initialization must be complete at this point"); 1073 } else { 1074 // patch the instruction <move reg, klass> 1075 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1076 1077 assert(n_copy->data() == 0 || 1078 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1079 "illegal init value"); 1080 if (stub_id == Runtime1::load_klass_patching_id) { 1081 assert(load_klass != NULL, "klass not set"); 1082 n_copy->set_data((intx) (load_klass)); 1083 } else { 1084 assert(mirror() != NULL, "klass not set"); 1085 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop. 1086 n_copy->set_data(cast_from_oop<intx>(mirror())); 1087 } 1088 1089 if (TracePatching) { 1090 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1091 } 1092 } 1093 } else if (stub_id == Runtime1::load_appendix_patching_id) { 1094 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1095 assert(n_copy->data() == 0 || 1096 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1097 "illegal init value"); 1098 n_copy->set_data(cast_from_oop<intx>(appendix())); 1099 1100 if (TracePatching) { 1101 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1102 } 1103 } else { 1104 ShouldNotReachHere(); 1105 } 1106 1107 #if defined(SPARC) || defined(PPC32) 1108 if (load_klass_or_mirror_patch_id || 1109 stub_id == Runtime1::load_appendix_patching_id) { 1110 // Update the location in the nmethod with the proper 1111 // metadata. When the code was generated, a NULL was stuffed 1112 // in the metadata table and that table needs to be update to 1113 // have the right value. On intel the value is kept 1114 // directly in the instruction instead of in the metadata 1115 // table, so set_data above effectively updated the value. 1116 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1117 assert(nm != NULL, "invalid nmethod_pc"); 1118 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1119 bool found = false; 1120 while (mds.next() && !found) { 1121 if (mds.type() == relocInfo::oop_type) { 1122 assert(stub_id == Runtime1::load_mirror_patching_id || 1123 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1124 oop_Relocation* r = mds.oop_reloc(); 1125 oop* oop_adr = r->oop_addr(); 1126 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix(); 1127 r->fix_oop_relocation(); 1128 found = true; 1129 } else if (mds.type() == relocInfo::metadata_type) { 1130 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1131 metadata_Relocation* r = mds.metadata_reloc(); 1132 Metadata** metadata_adr = r->metadata_addr(); 1133 *metadata_adr = load_klass; 1134 r->fix_metadata_relocation(); 1135 found = true; 1136 } 1137 } 1138 assert(found, "the metadata must exist!"); 1139 } 1140 #endif 1141 if (do_patch) { 1142 // replace instructions 1143 // first replace the tail, then the call 1144 #ifdef ARM 1145 if((load_klass_or_mirror_patch_id || 1146 stub_id == Runtime1::load_appendix_patching_id) && 1147 nativeMovConstReg_at(copy_buff)->is_pc_relative()) { 1148 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1149 address addr = NULL; 1150 assert(nm != NULL, "invalid nmethod_pc"); 1151 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1152 while (mds.next()) { 1153 if (mds.type() == relocInfo::oop_type) { 1154 assert(stub_id == Runtime1::load_mirror_patching_id || 1155 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1156 oop_Relocation* r = mds.oop_reloc(); 1157 addr = (address)r->oop_addr(); 1158 break; 1159 } else if (mds.type() == relocInfo::metadata_type) { 1160 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1161 metadata_Relocation* r = mds.metadata_reloc(); 1162 addr = (address)r->metadata_addr(); 1163 break; 1164 } 1165 } 1166 assert(addr != NULL, "metadata relocation must exist"); 1167 copy_buff -= *byte_count; 1168 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff); 1169 n_copy2->set_pc_relative_offset(addr, instr_pc); 1170 } 1171 #endif 1172 1173 for (int i = NativeGeneralJump::instruction_size; i < *byte_count; i++) { 1174 address ptr = copy_buff + i; 1175 int a_byte = (*ptr) & 0xFF; 1176 address dst = instr_pc + i; 1177 *(unsigned char*)dst = (unsigned char) a_byte; 1178 } 1179 ICache::invalidate_range(instr_pc, *byte_count); 1180 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff); 1181 1182 if (load_klass_or_mirror_patch_id || 1183 stub_id == Runtime1::load_appendix_patching_id) { 1184 relocInfo::relocType rtype = 1185 (stub_id == Runtime1::load_klass_patching_id) ? 1186 relocInfo::metadata_type : 1187 relocInfo::oop_type; 1188 // update relocInfo to metadata 1189 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1190 assert(nm != NULL, "invalid nmethod_pc"); 1191 1192 // The old patch site is now a move instruction so update 1193 // the reloc info so that it will get updated during 1194 // future GCs. 1195 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1)); 1196 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc, 1197 relocInfo::none, rtype); 1198 #ifdef SPARC 1199 // Sparc takes two relocations for an metadata so update the second one. 1200 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset; 1201 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1202 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1203 relocInfo::none, rtype); 1204 #endif 1205 #ifdef PPC32 1206 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset; 1207 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1208 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1209 relocInfo::none, rtype); 1210 } 1211 #endif 1212 } 1213 1214 } else { 1215 ICache::invalidate_range(copy_buff, *byte_count); 1216 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry); 1217 } 1218 } 1219 } 1220 } 1221 1222 // If we are patching in a non-perm oop, make sure the nmethod 1223 // is on the right list. 1224 if (ScavengeRootsInCode) { 1225 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag); 1226 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1227 guarantee(nm != NULL, "only nmethods can contain non-perm oops"); 1228 1229 // Since we've patched some oops in the nmethod, 1230 // (re)register it with the heap. 1231 Universe::heap()->register_nmethod(nm); 1232 } 1233 JRT_END 1234 1235 #else // DEOPTIMIZE_WHEN_PATCHING 1236 1237 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) 1238 RegisterMap reg_map(thread, false); 1239 1240 NOT_PRODUCT(_patch_code_slowcase_cnt++;) 1241 if (TracePatching) { 1242 tty->print_cr("Deoptimizing because patch is needed"); 1243 } 1244 1245 frame runtime_frame = thread->last_frame(); 1246 frame caller_frame = runtime_frame.sender(®_map); 1247 1248 // It's possible the nmethod was invalidated in the last 1249 // safepoint, but if it's still alive then make it not_entrant. 1250 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1251 if (nm != NULL) { 1252 nm->make_not_entrant(); 1253 } 1254 1255 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1256 1257 // Return to the now deoptimized frame. 1258 JRT_END 1259 1260 #endif // DEOPTIMIZE_WHEN_PATCHING 1261 1262 // 1263 // Entry point for compiled code. We want to patch a nmethod. 1264 // We don't do a normal VM transition here because we want to 1265 // know after the patching is complete and any safepoint(s) are taken 1266 // if the calling nmethod was deoptimized. We do this by calling a 1267 // helper method which does the normal VM transition and when it 1268 // completes we can check for deoptimization. This simplifies the 1269 // assembly code in the cpu directories. 1270 // 1271 int Runtime1::move_klass_patching(JavaThread* thread) { 1272 // 1273 // NOTE: we are still in Java 1274 // 1275 Thread* THREAD = thread; 1276 debug_only(NoHandleMark nhm;) 1277 { 1278 // Enter VM mode 1279 1280 ResetNoHandleMark rnhm; 1281 patch_code(thread, load_klass_patching_id); 1282 } 1283 // Back in JAVA, use no oops DON'T safepoint 1284 1285 // Return true if calling code is deoptimized 1286 1287 return caller_is_deopted(); 1288 } 1289 1290 int Runtime1::move_mirror_patching(JavaThread* thread) { 1291 // 1292 // NOTE: we are still in Java 1293 // 1294 Thread* THREAD = thread; 1295 debug_only(NoHandleMark nhm;) 1296 { 1297 // Enter VM mode 1298 1299 ResetNoHandleMark rnhm; 1300 patch_code(thread, load_mirror_patching_id); 1301 } 1302 // Back in JAVA, use no oops DON'T safepoint 1303 1304 // Return true if calling code is deoptimized 1305 1306 return caller_is_deopted(); 1307 } 1308 1309 int Runtime1::move_appendix_patching(JavaThread* thread) { 1310 // 1311 // NOTE: we are still in Java 1312 // 1313 Thread* THREAD = thread; 1314 debug_only(NoHandleMark nhm;) 1315 { 1316 // Enter VM mode 1317 1318 ResetNoHandleMark rnhm; 1319 patch_code(thread, load_appendix_patching_id); 1320 } 1321 // Back in JAVA, use no oops DON'T safepoint 1322 1323 // Return true if calling code is deoptimized 1324 1325 return caller_is_deopted(); 1326 } 1327 // 1328 // Entry point for compiled code. We want to patch a nmethod. 1329 // We don't do a normal VM transition here because we want to 1330 // know after the patching is complete and any safepoint(s) are taken 1331 // if the calling nmethod was deoptimized. We do this by calling a 1332 // helper method which does the normal VM transition and when it 1333 // completes we can check for deoptimization. This simplifies the 1334 // assembly code in the cpu directories. 1335 // 1336 1337 int Runtime1::access_field_patching(JavaThread* thread) { 1338 // 1339 // NOTE: we are still in Java 1340 // 1341 Thread* THREAD = thread; 1342 debug_only(NoHandleMark nhm;) 1343 { 1344 // Enter VM mode 1345 1346 ResetNoHandleMark rnhm; 1347 patch_code(thread, access_field_patching_id); 1348 } 1349 // Back in JAVA, use no oops DON'T safepoint 1350 1351 // Return true if calling code is deoptimized 1352 1353 return caller_is_deopted(); 1354 JRT_END 1355 1356 1357 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id)) 1358 // for now we just print out the block id 1359 tty->print("%d ", block_id); 1360 JRT_END 1361 1362 1363 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj)) 1364 // had to return int instead of bool, otherwise there may be a mismatch 1365 // between the C calling convention and the Java one. 1366 // e.g., on x86, GCC may clear only %al when returning a bool false, but 1367 // JVM takes the whole %eax as the return value, which may misinterpret 1368 // the return value as a boolean true. 1369 1370 assert(mirror != NULL, "should null-check on mirror before calling"); 1371 Klass* k = java_lang_Class::as_Klass(mirror); 1372 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0; 1373 JRT_END 1374 1375 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread)) 1376 ResourceMark rm; 1377 1378 assert(!TieredCompilation, "incompatible with tiered compilation"); 1379 1380 RegisterMap reg_map(thread, false); 1381 frame runtime_frame = thread->last_frame(); 1382 frame caller_frame = runtime_frame.sender(®_map); 1383 1384 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1385 assert (nm != NULL, "no more nmethod?"); 1386 nm->make_not_entrant(); 1387 1388 methodHandle m(nm->method()); 1389 MethodData* mdo = m->method_data(); 1390 1391 if (mdo == NULL && !HAS_PENDING_EXCEPTION) { 1392 // Build an MDO. Ignore errors like OutOfMemory; 1393 // that simply means we won't have an MDO to update. 1394 Method::build_interpreter_method_data(m, THREAD); 1395 if (HAS_PENDING_EXCEPTION) { 1396 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 1397 CLEAR_PENDING_EXCEPTION; 1398 } 1399 mdo = m->method_data(); 1400 } 1401 1402 if (mdo != NULL) { 1403 mdo->inc_trap_count(Deoptimization::Reason_none); 1404 } 1405 1406 if (TracePredicateFailedTraps) { 1407 stringStream ss1, ss2; 1408 vframeStream vfst(thread); 1409 methodHandle inlinee = methodHandle(vfst.method()); 1410 inlinee->print_short_name(&ss1); 1411 m->print_short_name(&ss2); 1412 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())); 1413 } 1414 1415 1416 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1417 1418 JRT_END 1419 1420 #ifndef PRODUCT 1421 void Runtime1::print_statistics() { 1422 tty->print_cr("C1 Runtime statistics:"); 1423 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr); 1424 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr); 1425 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr); 1426 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr); 1427 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr); 1428 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt); 1429 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt); 1430 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_stub_cnt); 1431 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_stub_cnt); 1432 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_stub_cnt); 1433 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_stub_cnt); 1434 tty->print_cr(" _oop_arraycopy_cnt: %d", _oop_arraycopy_stub_cnt); 1435 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt); 1436 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt); 1437 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt); 1438 1439 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt); 1440 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt); 1441 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt); 1442 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt); 1443 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt); 1444 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt); 1445 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt); 1446 1447 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count); 1448 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count); 1449 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count); 1450 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count); 1451 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count); 1452 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count); 1453 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count); 1454 tty->print_cr(" _throw_count: %d:", _throw_count); 1455 1456 SharedRuntime::print_ic_miss_histogram(); 1457 tty->cr(); 1458 } 1459 #endif // PRODUCT