1 /* 2 * Copyright (c) 1999, 2015, 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_interface/collectedHeap.hpp" 42 #include "interpreter/bytecode.hpp" 43 #include "interpreter/interpreter.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "memory/barrierSet.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "oops/objArrayKlass.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "runtime/biasedLocking.hpp" 51 #include "runtime/compilationPolicy.hpp" 52 #include "runtime/interfaceSupport.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/sharedRuntime.hpp" 55 #include "runtime/threadCritical.hpp" 56 #include "runtime/vframe.hpp" 57 #include "runtime/vframeArray.hpp" 58 #include "utilities/copy.hpp" 59 #include "utilities/events.hpp" 60 61 62 // Implementation of StubAssembler 63 64 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) { 65 _name = name; 66 _must_gc_arguments = false; 67 _frame_size = no_frame_size; 68 _num_rt_args = 0; 69 _stub_id = stub_id; 70 } 71 72 73 void StubAssembler::set_info(const char* name, bool must_gc_arguments) { 74 _name = name; 75 _must_gc_arguments = must_gc_arguments; 76 } 77 78 79 void StubAssembler::set_frame_size(int size) { 80 if (_frame_size == no_frame_size) { 81 _frame_size = size; 82 } 83 assert(_frame_size == size, "can't change the frame size"); 84 } 85 86 87 void StubAssembler::set_num_rt_args(int args) { 88 if (_num_rt_args == 0) { 89 _num_rt_args = args; 90 } 91 assert(_num_rt_args == args, "can't change the number of args"); 92 } 93 94 // Implementation of Runtime1 95 96 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids]; 97 const char *Runtime1::_blob_names[] = { 98 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME) 99 }; 100 101 #ifndef PRODUCT 102 // statistics 103 int Runtime1::_generic_arraycopy_cnt = 0; 104 int Runtime1::_primitive_arraycopy_cnt = 0; 105 int Runtime1::_oop_arraycopy_cnt = 0; 106 int Runtime1::_generic_arraycopystub_cnt = 0; 107 int Runtime1::_arraycopy_slowcase_cnt = 0; 108 int Runtime1::_arraycopy_checkcast_cnt = 0; 109 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0; 110 int Runtime1::_new_type_array_slowcase_cnt = 0; 111 int Runtime1::_new_object_array_slowcase_cnt = 0; 112 int Runtime1::_new_instance_slowcase_cnt = 0; 113 int Runtime1::_new_multi_array_slowcase_cnt = 0; 114 int Runtime1::_monitorenter_slowcase_cnt = 0; 115 int Runtime1::_monitorexit_slowcase_cnt = 0; 116 int Runtime1::_patch_code_slowcase_cnt = 0; 117 int Runtime1::_throw_range_check_exception_count = 0; 118 int Runtime1::_throw_index_exception_count = 0; 119 int Runtime1::_throw_div0_exception_count = 0; 120 int Runtime1::_throw_null_pointer_exception_count = 0; 121 int Runtime1::_throw_class_cast_exception_count = 0; 122 int Runtime1::_throw_incompatible_class_change_error_count = 0; 123 int Runtime1::_throw_array_store_exception_count = 0; 124 int Runtime1::_throw_count = 0; 125 126 static int _byte_arraycopy_cnt = 0; 127 static int _short_arraycopy_cnt = 0; 128 static int _int_arraycopy_cnt = 0; 129 static int _long_arraycopy_cnt = 0; 130 static int _oop_arraycopy_cnt = 0; 131 132 address Runtime1::arraycopy_count_address(BasicType type) { 133 switch (type) { 134 case T_BOOLEAN: 135 case T_BYTE: return (address)&_byte_arraycopy_cnt; 136 case T_CHAR: 137 case T_SHORT: return (address)&_short_arraycopy_cnt; 138 case T_FLOAT: 139 case T_INT: return (address)&_int_arraycopy_cnt; 140 case T_DOUBLE: 141 case T_LONG: return (address)&_long_arraycopy_cnt; 142 case T_ARRAY: 143 case T_OBJECT: return (address)&_oop_arraycopy_cnt; 144 default: 145 ShouldNotReachHere(); 146 return NULL; 147 } 148 } 149 150 151 #endif 152 153 // Simple helper to see if the caller of a runtime stub which 154 // entered the VM has been deoptimized 155 156 static bool caller_is_deopted() { 157 JavaThread* thread = JavaThread::current(); 158 RegisterMap reg_map(thread, false); 159 frame runtime_frame = thread->last_frame(); 160 frame caller_frame = runtime_frame.sender(®_map); 161 assert(caller_frame.is_compiled_frame(), "must be compiled"); 162 return caller_frame.is_deoptimized_frame(); 163 } 164 165 // Stress deoptimization 166 static void deopt_caller() { 167 if ( !caller_is_deopted()) { 168 JavaThread* thread = JavaThread::current(); 169 RegisterMap reg_map(thread, false); 170 frame runtime_frame = thread->last_frame(); 171 frame caller_frame = runtime_frame.sender(®_map); 172 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 173 assert(caller_is_deopted(), "Must be deoptimized"); 174 } 175 } 176 177 178 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) { 179 assert(0 <= id && id < number_of_ids, "illegal stub id"); 180 ResourceMark rm; 181 // create code buffer for code storage 182 CodeBuffer code(buffer_blob); 183 184 Compilation::setup_code_buffer(&code, 0); 185 186 // create assembler for code generation 187 StubAssembler* sasm = new StubAssembler(&code, name_for(id), id); 188 // generate code for runtime stub 189 OopMapSet* oop_maps; 190 oop_maps = generate_code_for(id, sasm); 191 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size, 192 "if stub has an oop map it must have a valid frame size"); 193 194 #ifdef ASSERT 195 // Make sure that stubs that need oopmaps have them 196 switch (id) { 197 // These stubs don't need to have an oopmap 198 case dtrace_object_alloc_id: 199 case g1_pre_barrier_slow_id: 200 case g1_post_barrier_slow_id: 201 case slow_subtype_check_id: 202 case fpu2long_stub_id: 203 case unwind_exception_id: 204 case counter_overflow_id: 205 #if defined(SPARC) || defined(PPC) 206 case handle_exception_nofpu_id: // Unused on sparc 207 #endif 208 break; 209 210 // All other stubs should have oopmaps 211 default: 212 assert(oop_maps != NULL, "must have an oopmap"); 213 } 214 #endif 215 216 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned) 217 sasm->align(BytesPerWord); 218 // make sure all code is in code buffer 219 sasm->flush(); 220 // create blob - distinguish a few special cases 221 CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id), 222 &code, 223 CodeOffsets::frame_never_safe, 224 sasm->frame_size(), 225 oop_maps, 226 sasm->must_gc_arguments()); 227 // install blob 228 assert(blob != NULL, "blob must exist"); 229 _blobs[id] = blob; 230 } 231 232 233 void Runtime1::initialize(BufferBlob* blob) { 234 // platform-dependent initialization 235 initialize_pd(); 236 // generate stubs 237 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id); 238 // printing 239 #ifndef PRODUCT 240 if (PrintSimpleStubs) { 241 ResourceMark rm; 242 for (int id = 0; id < number_of_ids; id++) { 243 _blobs[id]->print(); 244 if (_blobs[id]->oop_maps() != NULL) { 245 _blobs[id]->oop_maps()->print(); 246 } 247 } 248 } 249 #endif 250 } 251 252 253 CodeBlob* Runtime1::blob_for(StubID id) { 254 assert(0 <= id && id < number_of_ids, "illegal stub id"); 255 return _blobs[id]; 256 } 257 258 259 const char* Runtime1::name_for(StubID id) { 260 assert(0 <= id && id < number_of_ids, "illegal stub id"); 261 return _blob_names[id]; 262 } 263 264 const char* Runtime1::name_for_address(address entry) { 265 for (int id = 0; id < number_of_ids; id++) { 266 if (entry == entry_for((StubID)id)) return name_for((StubID)id); 267 } 268 269 #define FUNCTION_CASE(a, f) \ 270 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f 271 272 FUNCTION_CASE(entry, os::javaTimeMillis); 273 FUNCTION_CASE(entry, os::javaTimeNanos); 274 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end); 275 FUNCTION_CASE(entry, SharedRuntime::d2f); 276 FUNCTION_CASE(entry, SharedRuntime::d2i); 277 FUNCTION_CASE(entry, SharedRuntime::d2l); 278 FUNCTION_CASE(entry, SharedRuntime::dcos); 279 FUNCTION_CASE(entry, SharedRuntime::dexp); 280 FUNCTION_CASE(entry, SharedRuntime::dlog); 281 FUNCTION_CASE(entry, SharedRuntime::dlog10); 282 FUNCTION_CASE(entry, SharedRuntime::dpow); 283 FUNCTION_CASE(entry, SharedRuntime::drem); 284 FUNCTION_CASE(entry, SharedRuntime::dsin); 285 FUNCTION_CASE(entry, SharedRuntime::dtan); 286 FUNCTION_CASE(entry, SharedRuntime::f2i); 287 FUNCTION_CASE(entry, SharedRuntime::f2l); 288 FUNCTION_CASE(entry, SharedRuntime::frem); 289 FUNCTION_CASE(entry, SharedRuntime::l2d); 290 FUNCTION_CASE(entry, SharedRuntime::l2f); 291 FUNCTION_CASE(entry, SharedRuntime::ldiv); 292 FUNCTION_CASE(entry, SharedRuntime::lmul); 293 FUNCTION_CASE(entry, SharedRuntime::lrem); 294 FUNCTION_CASE(entry, SharedRuntime::lrem); 295 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry); 296 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit); 297 FUNCTION_CASE(entry, is_instance_of); 298 FUNCTION_CASE(entry, trace_block_entry); 299 #ifdef TRACE_HAVE_INTRINSICS 300 FUNCTION_CASE(entry, TRACE_TIME_METHOD); 301 #endif 302 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32()); 303 304 #undef FUNCTION_CASE 305 306 // Soft float adds more runtime names. 307 return pd_name_for_address(entry); 308 } 309 310 311 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass)) 312 NOT_PRODUCT(_new_instance_slowcase_cnt++;) 313 314 assert(klass->is_klass(), "not a class"); 315 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 316 instanceKlassHandle h(thread, klass); 317 h->check_valid_for_instantiation(true, CHECK); 318 // make sure klass is initialized 319 h->initialize(CHECK); 320 // allocate instance and return via TLS 321 oop obj = h->allocate_instance(CHECK); 322 thread->set_vm_result(obj); 323 JRT_END 324 325 326 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length)) 327 NOT_PRODUCT(_new_type_array_slowcase_cnt++;) 328 // Note: no handle for klass needed since they are not used 329 // anymore after new_typeArray() and no GC can happen before. 330 // (This may have to change if this code changes!) 331 assert(klass->is_klass(), "not a class"); 332 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type(); 333 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK); 334 thread->set_vm_result(obj); 335 // This is pretty rare but this runtime patch is stressful to deoptimization 336 // if we deoptimize here so force a deopt to stress the path. 337 if (DeoptimizeALot) { 338 deopt_caller(); 339 } 340 341 JRT_END 342 343 344 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length)) 345 NOT_PRODUCT(_new_object_array_slowcase_cnt++;) 346 347 // Note: no handle for klass needed since they are not used 348 // anymore after new_objArray() and no GC can happen before. 349 // (This may have to change if this code changes!) 350 assert(array_klass->is_klass(), "not a class"); 351 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive 352 Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass(); 353 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK); 354 thread->set_vm_result(obj); 355 // This is pretty rare but this runtime patch is stressful to deoptimization 356 // if we deoptimize here so force a deopt to stress the path. 357 if (DeoptimizeALot) { 358 deopt_caller(); 359 } 360 JRT_END 361 362 363 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims)) 364 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;) 365 366 assert(klass->is_klass(), "not a class"); 367 assert(rank >= 1, "rank must be nonzero"); 368 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive 369 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK); 370 thread->set_vm_result(obj); 371 JRT_END 372 373 374 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id)) 375 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id); 376 JRT_END 377 378 379 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj)) 380 ResourceMark rm(thread); 381 const char* klass_name = obj->klass()->external_name(); 382 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name); 383 JRT_END 384 385 386 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method 387 // associated with the top activation record. The inlinee (that is possibly included in the enclosing 388 // method) method oop is passed as an argument. In order to do that it is embedded in the code as 389 // a constant. 390 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) { 391 nmethod* osr_nm = NULL; 392 methodHandle method(THREAD, m); 393 394 RegisterMap map(THREAD, false); 395 frame fr = THREAD->last_frame().sender(&map); 396 nmethod* nm = (nmethod*) fr.cb(); 397 assert(nm!= NULL && nm->is_nmethod(), "Sanity check"); 398 methodHandle enclosing_method(THREAD, nm->method()); 399 400 CompLevel level = (CompLevel)nm->comp_level(); 401 int bci = InvocationEntryBci; 402 if (branch_bci != InvocationEntryBci) { 403 // Compute desination bci 404 address pc = method()->code_base() + branch_bci; 405 Bytecodes::Code branch = Bytecodes::code_at(method(), pc); 406 int offset = 0; 407 switch (branch) { 408 case Bytecodes::_if_icmplt: case Bytecodes::_iflt: 409 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt: 410 case Bytecodes::_if_icmple: case Bytecodes::_ifle: 411 case Bytecodes::_if_icmpge: case Bytecodes::_ifge: 412 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq: 413 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne: 414 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto: 415 offset = (int16_t)Bytes::get_Java_u2(pc + 1); 416 break; 417 case Bytecodes::_goto_w: 418 offset = Bytes::get_Java_u4(pc + 1); 419 break; 420 default: ; 421 } 422 bci = branch_bci + offset; 423 } 424 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending"); 425 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD); 426 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions"); 427 return osr_nm; 428 } 429 430 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method)) 431 nmethod* osr_nm; 432 JRT_BLOCK 433 osr_nm = counter_overflow_helper(thread, bci, method); 434 if (osr_nm != NULL) { 435 RegisterMap map(thread, false); 436 frame fr = thread->last_frame().sender(&map); 437 Deoptimization::deoptimize_frame(thread, fr.id()); 438 } 439 JRT_BLOCK_END 440 return NULL; 441 JRT_END 442 443 extern void vm_exit(int code); 444 445 // Enter this method from compiled code handler below. This is where we transition 446 // to VM mode. This is done as a helper routine so that the method called directly 447 // from compiled code does not have to transition to VM. This allows the entry 448 // method to see if the nmethod that we have just looked up a handler for has 449 // been deoptimized while we were in the vm. This simplifies the assembly code 450 // cpu directories. 451 // 452 // We are entering here from exception stub (via the entry method below) 453 // If there is a compiled exception handler in this method, we will continue there; 454 // otherwise we will unwind the stack and continue at the caller of top frame method 455 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to 456 // control the area where we can allow a safepoint. After we exit the safepoint area we can 457 // check to see if the handler we are going to return is now in a nmethod that has 458 // been deoptimized. If that is the case we return the deopt blob 459 // unpack_with_exception entry instead. This makes life for the exception blob easier 460 // because making that same check and diverting is painful from assembly language. 461 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm)) 462 // Reset method handle flag. 463 thread->set_is_method_handle_return(false); 464 465 Handle exception(thread, ex); 466 nm = CodeCache::find_nmethod(pc); 467 assert(nm != NULL, "this is not an nmethod"); 468 // Adjust the pc as needed/ 469 if (nm->is_deopt_pc(pc)) { 470 RegisterMap map(thread, false); 471 frame exception_frame = thread->last_frame().sender(&map); 472 // if the frame isn't deopted then pc must not correspond to the caller of last_frame 473 assert(exception_frame.is_deoptimized_frame(), "must be deopted"); 474 pc = exception_frame.pc(); 475 } 476 #ifdef ASSERT 477 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception"); 478 assert(exception->is_oop(), "just checking"); 479 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError 480 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) { 481 if (ExitVMOnVerifyError) vm_exit(-1); 482 ShouldNotReachHere(); 483 } 484 #endif 485 486 // Check the stack guard pages and reenable them if necessary and there is 487 // enough space on the stack to do so. Use fast exceptions only if the guard 488 // pages are enabled. 489 bool guard_pages_enabled = thread->stack_yellow_zone_enabled(); 490 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); 491 492 if (JvmtiExport::can_post_on_exceptions()) { 493 // To ensure correct notification of exception catches and throws 494 // we have to deoptimize here. If we attempted to notify the 495 // catches and throws during this exception lookup it's possible 496 // we could deoptimize on the way out of the VM and end back in 497 // the interpreter at the throw site. This would result in double 498 // notifications since the interpreter would also notify about 499 // these same catches and throws as it unwound the frame. 500 501 RegisterMap reg_map(thread); 502 frame stub_frame = thread->last_frame(); 503 frame caller_frame = stub_frame.sender(®_map); 504 505 // We don't really want to deoptimize the nmethod itself since we 506 // can actually continue in the exception handler ourselves but I 507 // don't see an easy way to have the desired effect. 508 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 509 assert(caller_is_deopted(), "Must be deoptimized"); 510 511 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 512 } 513 514 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions 515 if (guard_pages_enabled) { 516 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc); 517 if (fast_continuation != NULL) { 518 // Set flag if return address is a method handle call site. 519 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 520 return fast_continuation; 521 } 522 } 523 524 // If the stack guard pages are enabled, check whether there is a handler in 525 // the current method. Otherwise (guard pages disabled), force an unwind and 526 // skip the exception cache update (i.e., just leave continuation==NULL). 527 address continuation = NULL; 528 if (guard_pages_enabled) { 529 530 // New exception handling mechanism can support inlined methods 531 // with exception handlers since the mappings are from PC to PC 532 533 // debugging support 534 // tracing 535 if (TraceExceptions) { 536 ttyLocker ttyl; 537 ResourceMark rm; 538 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ") thrown in compiled method <%s> at PC " INTPTR_FORMAT " for thread " INTPTR_FORMAT "", 539 exception->print_value_string(), p2i((address)exception()), nm->method()->print_value_string(), p2i(pc), p2i(thread)); 540 } 541 // for AbortVMOnException flag 542 NOT_PRODUCT(Exceptions::debug_check_abort(exception)); 543 544 // Clear out the exception oop and pc since looking up an 545 // exception handler can cause class loading, which might throw an 546 // exception and those fields are expected to be clear during 547 // normal bytecode execution. 548 thread->clear_exception_oop_and_pc(); 549 550 Handle original_exception(thread, exception()); 551 552 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false); 553 // If an exception was thrown during exception dispatch, the exception oop may have changed 554 thread->set_exception_oop(exception()); 555 thread->set_exception_pc(pc); 556 557 // the exception cache is used only by non-implicit exceptions 558 // Update the exception cache only when there didn't happen 559 // another exception during the computation of the compiled 560 // exception handler. 561 if (continuation != NULL && original_exception() == exception()) { 562 nm->add_handler_for_exception_and_pc(exception, pc, continuation); 563 } 564 } 565 566 thread->set_vm_result(exception()); 567 // Set flag if return address is a method handle call site. 568 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); 569 570 if (TraceExceptions) { 571 ttyLocker ttyl; 572 ResourceMark rm; 573 tty->print_cr("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT " for exception thrown at PC " PTR_FORMAT, 574 p2i(thread), p2i(continuation), p2i(pc)); 575 } 576 577 return continuation; 578 JRT_END 579 580 // Enter this method from compiled code only if there is a Java exception handler 581 // in the method handling the exception. 582 // We are entering here from exception stub. We don't do a normal VM transition here. 583 // We do it in a helper. This is so we can check to see if the nmethod we have just 584 // searched for an exception handler has been deoptimized in the meantime. 585 address Runtime1::exception_handler_for_pc(JavaThread* thread) { 586 oop exception = thread->exception_oop(); 587 address pc = thread->exception_pc(); 588 // Still in Java mode 589 DEBUG_ONLY(ResetNoHandleMark rnhm); 590 nmethod* nm = NULL; 591 address continuation = NULL; 592 { 593 // Enter VM mode by calling the helper 594 ResetNoHandleMark rnhm; 595 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm); 596 } 597 // Back in JAVA, use no oops DON'T safepoint 598 599 // Now check to see if the nmethod we were called from is now deoptimized. 600 // If so we must return to the deopt blob and deoptimize the nmethod 601 if (nm != NULL && caller_is_deopted()) { 602 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); 603 } 604 605 assert(continuation != NULL, "no handler found"); 606 return continuation; 607 } 608 609 610 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index)) 611 NOT_PRODUCT(_throw_range_check_exception_count++;) 612 char message[jintAsStringSize]; 613 sprintf(message, "%d", index); 614 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message); 615 JRT_END 616 617 618 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index)) 619 NOT_PRODUCT(_throw_index_exception_count++;) 620 char message[16]; 621 sprintf(message, "%d", index); 622 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message); 623 JRT_END 624 625 626 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread)) 627 NOT_PRODUCT(_throw_div0_exception_count++;) 628 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); 629 JRT_END 630 631 632 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread)) 633 NOT_PRODUCT(_throw_null_pointer_exception_count++;) 634 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); 635 JRT_END 636 637 638 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object)) 639 NOT_PRODUCT(_throw_class_cast_exception_count++;) 640 ResourceMark rm(thread); 641 char* message = SharedRuntime::generate_class_cast_message( 642 thread, object->klass()->external_name()); 643 SharedRuntime::throw_and_post_jvmti_exception( 644 thread, vmSymbols::java_lang_ClassCastException(), message); 645 JRT_END 646 647 648 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread)) 649 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;) 650 ResourceMark rm(thread); 651 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError()); 652 JRT_END 653 654 655 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock)) 656 NOT_PRODUCT(_monitorenter_slowcase_cnt++;) 657 if (PrintBiasedLockingStatistics) { 658 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); 659 } 660 Handle h_obj(thread, obj); 661 assert(h_obj()->is_oop(), "must be NULL or an object"); 662 if (UseBiasedLocking) { 663 // Retry fast entry if bias is revoked to avoid unnecessary inflation 664 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK); 665 } else { 666 if (UseFastLocking) { 667 // When using fast locking, the compiled code has already tried the fast case 668 assert(obj == lock->obj(), "must match"); 669 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD); 670 } else { 671 lock->set_obj(obj); 672 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD); 673 } 674 } 675 JRT_END 676 677 678 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock)) 679 NOT_PRODUCT(_monitorexit_slowcase_cnt++;) 680 assert(thread == JavaThread::current(), "threads must correspond"); 681 assert(thread->last_Java_sp(), "last_Java_sp must be set"); 682 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown 683 EXCEPTION_MARK; 684 685 oop obj = lock->obj(); 686 assert(obj->is_oop(), "must be NULL or an object"); 687 if (UseFastLocking) { 688 // When using fast locking, the compiled code has already tried the fast case 689 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD); 690 } else { 691 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD); 692 } 693 JRT_END 694 695 // Cf. OptoRuntime::deoptimize_caller_frame 696 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread)) 697 // Called from within the owner thread, so no need for safepoint 698 RegisterMap reg_map(thread, false); 699 frame stub_frame = thread->last_frame(); 700 assert(stub_frame.is_runtime_frame(), "sanity check"); 701 frame caller_frame = stub_frame.sender(®_map); 702 703 // We are coming from a compiled method; check this is true. 704 assert(CodeCache::find_nmethod(caller_frame.pc()) != NULL, "sanity"); 705 706 // Deoptimize the caller frame. 707 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 708 709 // Return to the now deoptimized frame. 710 JRT_END 711 712 713 static Klass* resolve_field_return_klass(methodHandle caller, int bci, TRAPS) { 714 Bytecode_field field_access(caller, bci); 715 // This can be static or non-static field access 716 Bytecodes::Code code = field_access.code(); 717 718 // We must load class, initialize class and resolvethe field 719 fieldDescriptor result; // initialize class if needed 720 constantPoolHandle constants(THREAD, caller->constants()); 721 LinkResolver::resolve_field_access(result, constants, field_access.index(), Bytecodes::java_code(code), CHECK_NULL); 722 return result.field_holder(); 723 } 724 725 726 // 727 // This routine patches sites where a class wasn't loaded or 728 // initialized at the time the code was generated. It handles 729 // references to classes, fields and forcing of initialization. Most 730 // of the cases are straightforward and involving simply forcing 731 // resolution of a class, rewriting the instruction stream with the 732 // needed constant and replacing the call in this function with the 733 // patched code. The case for static field is more complicated since 734 // the thread which is in the process of initializing a class can 735 // access it's static fields but other threads can't so the code 736 // either has to deoptimize when this case is detected or execute a 737 // check that the current thread is the initializing thread. The 738 // current 739 // 740 // Patches basically look like this: 741 // 742 // 743 // patch_site: jmp patch stub ;; will be patched 744 // continue: ... 745 // ... 746 // ... 747 // ... 748 // 749 // They have a stub which looks like this: 750 // 751 // ;; patch body 752 // movl <const>, reg (for class constants) 753 // <or> movl [reg1 + <const>], reg (for field offsets) 754 // <or> movl reg, [reg1 + <const>] (for field offsets) 755 // <being_init offset> <bytes to copy> <bytes to skip> 756 // patch_stub: call Runtime1::patch_code (through a runtime stub) 757 // jmp patch_site 758 // 759 // 760 // A normal patch is done by rewriting the patch body, usually a move, 761 // and then copying it into place over top of the jmp instruction 762 // being careful to flush caches and doing it in an MP-safe way. The 763 // constants following the patch body are used to find various pieces 764 // of the patch relative to the call site for Runtime1::patch_code. 765 // The case for getstatic and putstatic is more complicated because 766 // getstatic and putstatic have special semantics when executing while 767 // the class is being initialized. getstatic/putstatic on a class 768 // which is being_initialized may be executed by the initializing 769 // thread but other threads have to block when they execute it. This 770 // is accomplished in compiled code by executing a test of the current 771 // thread against the initializing thread of the class. It's emitted 772 // as boilerplate in their stub which allows the patched code to be 773 // executed before it's copied back into the main body of the nmethod. 774 // 775 // being_init: get_thread(<tmp reg> 776 // cmpl [reg1 + <init_thread_offset>], <tmp reg> 777 // jne patch_stub 778 // movl [reg1 + <const>], reg (for field offsets) <or> 779 // movl reg, [reg1 + <const>] (for field offsets) 780 // jmp continue 781 // <being_init offset> <bytes to copy> <bytes to skip> 782 // patch_stub: jmp Runtim1::patch_code (through a runtime stub) 783 // jmp patch_site 784 // 785 // If the class is being initialized the patch body is rewritten and 786 // the patch site is rewritten to jump to being_init, instead of 787 // patch_stub. Whenever this code is executed it checks the current 788 // thread against the intializing thread so other threads will enter 789 // the runtime and end up blocked waiting the class to finish 790 // initializing inside the calls to resolve_field below. The 791 // initializing class will continue on it's way. Once the class is 792 // fully_initialized, the intializing_thread of the class becomes 793 // NULL, so the next thread to execute this code will fail the test, 794 // call into patch_code and complete the patching process by copying 795 // the patch body back into the main part of the nmethod and resume 796 // executing. 797 // 798 // 799 800 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) 801 NOT_PRODUCT(_patch_code_slowcase_cnt++;) 802 803 ResourceMark rm(thread); 804 RegisterMap reg_map(thread, false); 805 frame runtime_frame = thread->last_frame(); 806 frame caller_frame = runtime_frame.sender(®_map); 807 808 // last java frame on stack 809 vframeStream vfst(thread, true); 810 assert(!vfst.at_end(), "Java frame must exist"); 811 812 methodHandle caller_method(THREAD, vfst.method()); 813 // Note that caller_method->code() may not be same as caller_code because of OSR's 814 // Note also that in the presence of inlining it is not guaranteed 815 // that caller_method() == caller_code->method() 816 817 int bci = vfst.bci(); 818 Bytecodes::Code code = caller_method()->java_code_at(bci); 819 820 #ifndef PRODUCT 821 // this is used by assertions in the access_field_patching_id 822 BasicType patch_field_type = T_ILLEGAL; 823 #endif // PRODUCT 824 bool deoptimize_for_volatile = false; 825 int patch_field_offset = -1; 826 KlassHandle init_klass(THREAD, NULL); // klass needed by load_klass_patching code 827 KlassHandle load_klass(THREAD, NULL); // klass needed by load_klass_patching code 828 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code 829 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code 830 bool load_klass_or_mirror_patch_id = 831 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id); 832 833 if (stub_id == Runtime1::access_field_patching_id) { 834 835 Bytecode_field field_access(caller_method, bci); 836 fieldDescriptor result; // initialize class if needed 837 Bytecodes::Code code = field_access.code(); 838 constantPoolHandle constants(THREAD, caller_method->constants()); 839 LinkResolver::resolve_field_access(result, constants, field_access.index(), Bytecodes::java_code(code), CHECK); 840 patch_field_offset = result.offset(); 841 842 // If we're patching a field which is volatile then at compile it 843 // must not have been know to be volatile, so the generated code 844 // isn't correct for a volatile reference. The nmethod has to be 845 // deoptimized so that the code can be regenerated correctly. 846 // This check is only needed for access_field_patching since this 847 // is the path for patching field offsets. load_klass is only 848 // used for patching references to oops which don't need special 849 // handling in the volatile case. 850 deoptimize_for_volatile = result.access_flags().is_volatile(); 851 852 #ifndef PRODUCT 853 patch_field_type = result.field_type(); 854 #endif 855 } else if (load_klass_or_mirror_patch_id) { 856 Klass* k = NULL; 857 switch (code) { 858 case Bytecodes::_putstatic: 859 case Bytecodes::_getstatic: 860 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK); 861 init_klass = KlassHandle(THREAD, klass); 862 mirror = Handle(THREAD, klass->java_mirror()); 863 } 864 break; 865 case Bytecodes::_new: 866 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci)); 867 k = caller_method->constants()->klass_at(bnew.index(), CHECK); 868 } 869 break; 870 case Bytecodes::_multianewarray: 871 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci)); 872 k = caller_method->constants()->klass_at(mna.index(), CHECK); 873 } 874 break; 875 case Bytecodes::_instanceof: 876 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci)); 877 k = caller_method->constants()->klass_at(io.index(), CHECK); 878 } 879 break; 880 case Bytecodes::_checkcast: 881 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci)); 882 k = caller_method->constants()->klass_at(cc.index(), CHECK); 883 } 884 break; 885 case Bytecodes::_anewarray: 886 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci)); 887 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK); 888 k = ek->array_klass(CHECK); 889 } 890 break; 891 case Bytecodes::_ldc: 892 case Bytecodes::_ldc_w: 893 { 894 Bytecode_loadconstant cc(caller_method, bci); 895 oop m = cc.resolve_constant(CHECK); 896 mirror = Handle(THREAD, m); 897 } 898 break; 899 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id"); 900 } 901 // convert to handle 902 load_klass = KlassHandle(THREAD, k); 903 } else if (stub_id == load_appendix_patching_id) { 904 Bytecode_invoke bytecode(caller_method, bci); 905 Bytecodes::Code bc = bytecode.invoke_code(); 906 907 CallInfo info; 908 constantPoolHandle pool(thread, caller_method->constants()); 909 int index = bytecode.index(); 910 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK); 911 appendix = info.resolved_appendix(); 912 switch (bc) { 913 case Bytecodes::_invokehandle: { 914 int cache_index = ConstantPool::decode_cpcache_index(index, true); 915 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index"); 916 pool->cache()->entry_at(cache_index)->set_method_handle(pool, info); 917 break; 918 } 919 case Bytecodes::_invokedynamic: { 920 pool->invokedynamic_cp_cache_entry_at(index)->set_dynamic_call(pool, info); 921 break; 922 } 923 default: fatal("unexpected bytecode for load_appendix_patching_id"); 924 } 925 } else { 926 ShouldNotReachHere(); 927 } 928 929 if (deoptimize_for_volatile) { 930 // At compile time we assumed the field wasn't volatile but after 931 // loading it turns out it was volatile so we have to throw the 932 // compiled code out and let it be regenerated. 933 if (TracePatching) { 934 tty->print_cr("Deoptimizing for patching volatile field reference"); 935 } 936 // It's possible the nmethod was invalidated in the last 937 // safepoint, but if it's still alive then make it not_entrant. 938 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 939 if (nm != NULL) { 940 nm->make_not_entrant(); 941 } 942 943 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 944 945 // Return to the now deoptimized frame. 946 } 947 948 // Now copy code back 949 950 { 951 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag); 952 // 953 // Deoptimization may have happened while we waited for the lock. 954 // In that case we don't bother to do any patching we just return 955 // and let the deopt happen 956 if (!caller_is_deopted()) { 957 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc()); 958 address instr_pc = jump->jump_destination(); 959 NativeInstruction* ni = nativeInstruction_at(instr_pc); 960 if (NOT_AARCH32(ni->is_jump()) 961 AARCH32_ONLY(!ni->is_patched_already())) { 962 // the jump has not been patched yet 963 // The jump destination is slow case and therefore not part of the stubs 964 // (stubs are only for StaticCalls) 965 966 // format of buffer 967 // .... 968 // instr byte 0 <-- copy_buff 969 // instr byte 1 970 // .. 971 // instr byte n-1 972 // n 973 // .... <-- call destination 974 975 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset(); 976 unsigned char* byte_count = (unsigned char*) (stub_location - 1); 977 unsigned char* byte_skip = (unsigned char*) (stub_location - 2); 978 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3); 979 address copy_buff = stub_location - *byte_skip - *byte_count; 980 address being_initialized_entry = stub_location - *being_initialized_entry_offset; 981 if (TracePatching) { 982 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci, 983 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass"); 984 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc()); 985 assert(caller_code != NULL, "nmethod not found"); 986 987 // NOTE we use pc() not original_pc() because we already know they are 988 // identical otherwise we'd have never entered this block of code 989 990 OopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc()); 991 assert(map != NULL, "null check"); 992 map->print(); 993 tty->cr(); 994 995 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 996 } 997 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod 998 bool do_patch = true; 999 if (stub_id == Runtime1::access_field_patching_id) { 1000 // The offset may not be correct if the class was not loaded at code generation time. 1001 // Set it now. 1002 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff); 1003 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type"); 1004 assert(patch_field_offset >= 0, "illegal offset"); 1005 n_move->add_offset_in_bytes(patch_field_offset); 1006 } else if (load_klass_or_mirror_patch_id) { 1007 // If a getstatic or putstatic is referencing a klass which 1008 // isn't fully initialized, the patch body isn't copied into 1009 // place until initialization is complete. In this case the 1010 // patch site is setup so that any threads besides the 1011 // initializing thread are forced to come into the VM and 1012 // block. 1013 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) || 1014 InstanceKlass::cast(init_klass())->is_initialized(); 1015 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc); 1016 if (jump->jump_destination() == being_initialized_entry) { 1017 assert(do_patch == true, "initialization must be complete at this point"); 1018 } else { 1019 // patch the instruction <move reg, klass> 1020 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1021 1022 assert(n_copy->data() == 0 || 1023 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1024 "illegal init value"); 1025 if (stub_id == Runtime1::load_klass_patching_id) { 1026 assert(load_klass() != NULL, "klass not set"); 1027 n_copy->set_data((intx) (load_klass())); 1028 } else { 1029 assert(mirror() != NULL, "klass not set"); 1030 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop. 1031 n_copy->set_data(cast_from_oop<intx>(mirror())); 1032 } 1033 1034 if (TracePatching) { 1035 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1036 } 1037 } 1038 } else if (stub_id == Runtime1::load_appendix_patching_id) { 1039 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); 1040 assert(n_copy->data() == 0 || 1041 n_copy->data() == (intptr_t)Universe::non_oop_word(), 1042 "illegal init value"); 1043 n_copy->set_data(cast_from_oop<intx>(appendix())); 1044 1045 if (TracePatching) { 1046 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); 1047 } 1048 } else { 1049 ShouldNotReachHere(); 1050 } 1051 1052 #if defined(SPARC) || defined(PPC) || defined(AARCH32) 1053 if (load_klass_or_mirror_patch_id || 1054 stub_id == Runtime1::load_appendix_patching_id) { 1055 // Update the location in the nmethod with the proper 1056 // metadata. When the code was generated, a NULL was stuffed 1057 // in the metadata table and that table needs to be update to 1058 // have the right value. On intel the value is kept 1059 // directly in the instruction instead of in the metadata 1060 // table, so set_data above effectively updated the value. 1061 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1062 assert(nm != NULL, "invalid nmethod_pc"); 1063 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1064 bool found = false; 1065 while (mds.next() && !found) { 1066 if (mds.type() == relocInfo::oop_type) { 1067 assert(stub_id == Runtime1::load_mirror_patching_id || 1068 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1069 oop_Relocation* r = mds.oop_reloc(); 1070 oop* oop_adr = r->oop_addr(); 1071 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix(); 1072 r->fix_oop_relocation(); 1073 found = true; 1074 } else if (mds.type() == relocInfo::metadata_type) { 1075 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1076 metadata_Relocation* r = mds.metadata_reloc(); 1077 Metadata** metadata_adr = r->metadata_addr(); 1078 *metadata_adr = load_klass(); 1079 r->fix_metadata_relocation(); 1080 found = true; 1081 } 1082 } 1083 assert(found, "the metadata must exist!"); 1084 } 1085 #endif 1086 if (do_patch) { 1087 // replace instructions 1088 // first replace the tail, then the call 1089 #if defined(ARM) && !defined(AARCH32) 1090 if((load_klass_or_mirror_patch_id || 1091 stub_id == Runtime1::load_appendix_patching_id) && 1092 nativeMovConstReg_at(copy_buff)->is_pc_relative()) { 1093 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1094 address addr = NULL; 1095 assert(nm != NULL, "invalid nmethod_pc"); 1096 RelocIterator mds(nm, copy_buff, copy_buff + 1); 1097 while (mds.next()) { 1098 if (mds.type() == relocInfo::oop_type) { 1099 assert(stub_id == Runtime1::load_mirror_patching_id || 1100 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id"); 1101 oop_Relocation* r = mds.oop_reloc(); 1102 addr = (address)r->oop_addr(); 1103 break; 1104 } else if (mds.type() == relocInfo::metadata_type) { 1105 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id"); 1106 metadata_Relocation* r = mds.metadata_reloc(); 1107 addr = (address)r->metadata_addr(); 1108 break; 1109 } 1110 } 1111 assert(addr != NULL, "metadata relocation must exist"); 1112 copy_buff -= *byte_count; 1113 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff); 1114 n_copy2->set_pc_relative_offset(addr, instr_pc); 1115 } 1116 #endif 1117 1118 for (int i = NativeCall::instruction_size; i < *byte_count; i++) { 1119 address ptr = copy_buff + i; 1120 int a_byte = (*ptr) & 0xFF; 1121 address dst = instr_pc + i; 1122 *(unsigned char*)dst = (unsigned char) a_byte; 1123 } 1124 ICache::invalidate_range(instr_pc, *byte_count); 1125 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff); 1126 1127 if (load_klass_or_mirror_patch_id || 1128 stub_id == Runtime1::load_appendix_patching_id) { 1129 relocInfo::relocType rtype = 1130 (stub_id == Runtime1::load_klass_patching_id) ? 1131 relocInfo::metadata_type : 1132 relocInfo::oop_type; 1133 // update relocInfo to metadata 1134 nmethod* nm = CodeCache::find_nmethod(instr_pc); 1135 assert(nm != NULL, "invalid nmethod_pc"); 1136 1137 #if !defined(AARCH32) 1138 // The old patch site is now a move instruction so update 1139 // the reloc info so that it will get updated during 1140 // future GCs. 1141 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1)); 1142 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc, 1143 relocInfo::none, rtype); 1144 #endif 1145 #ifdef SPARC 1146 // Sparc takes two relocations for an metadata so update the second one. 1147 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset; 1148 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1149 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1150 relocInfo::none, rtype); 1151 #endif 1152 #ifdef PPC 1153 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset; 1154 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); 1155 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, 1156 relocInfo::none, rtype); 1157 } 1158 #endif 1159 } 1160 1161 } else { 1162 ICache::invalidate_range(copy_buff, *byte_count); 1163 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry); 1164 } 1165 } 1166 } 1167 } 1168 1169 // If we are patching in a non-perm oop, make sure the nmethod 1170 // is on the right list. 1171 if (ScavengeRootsInCode && ((mirror.not_null() && mirror()->is_scavengable()) || 1172 (appendix.not_null() && appendix->is_scavengable()))) { 1173 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag); 1174 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1175 guarantee(nm != NULL, "only nmethods can contain non-perm oops"); 1176 if (!nm->on_scavenge_root_list()) { 1177 CodeCache::add_scavenge_root_nmethod(nm); 1178 } 1179 1180 // Since we've patched some oops in the nmethod, 1181 // (re)register it with the heap. 1182 Universe::heap()->register_nmethod(nm); 1183 } 1184 JRT_END 1185 1186 // 1187 // Entry point for compiled code. We want to patch a nmethod. 1188 // We don't do a normal VM transition here because we want to 1189 // know after the patching is complete and any safepoint(s) are taken 1190 // if the calling nmethod was deoptimized. We do this by calling a 1191 // helper method which does the normal VM transition and when it 1192 // completes we can check for deoptimization. This simplifies the 1193 // assembly code in the cpu directories. 1194 // 1195 int Runtime1::move_klass_patching(JavaThread* thread) { 1196 // 1197 // NOTE: we are still in Java 1198 // 1199 Thread* THREAD = thread; 1200 debug_only(NoHandleMark nhm;) 1201 { 1202 // Enter VM mode 1203 1204 ResetNoHandleMark rnhm; 1205 patch_code(thread, load_klass_patching_id); 1206 } 1207 // Back in JAVA, use no oops DON'T safepoint 1208 1209 // Return true if calling code is deoptimized 1210 1211 return caller_is_deopted(); 1212 } 1213 1214 int Runtime1::move_mirror_patching(JavaThread* thread) { 1215 // 1216 // NOTE: we are still in Java 1217 // 1218 Thread* THREAD = thread; 1219 debug_only(NoHandleMark nhm;) 1220 { 1221 // Enter VM mode 1222 1223 ResetNoHandleMark rnhm; 1224 patch_code(thread, load_mirror_patching_id); 1225 } 1226 // Back in JAVA, use no oops DON'T safepoint 1227 1228 // Return true if calling code is deoptimized 1229 1230 return caller_is_deopted(); 1231 } 1232 1233 int Runtime1::move_appendix_patching(JavaThread* thread) { 1234 // 1235 // NOTE: we are still in Java 1236 // 1237 Thread* THREAD = thread; 1238 debug_only(NoHandleMark nhm;) 1239 { 1240 // Enter VM mode 1241 1242 ResetNoHandleMark rnhm; 1243 patch_code(thread, load_appendix_patching_id); 1244 } 1245 // Back in JAVA, use no oops DON'T safepoint 1246 1247 // Return true if calling code is deoptimized 1248 1249 return caller_is_deopted(); 1250 } 1251 // 1252 // Entry point for compiled code. We want to patch a nmethod. 1253 // We don't do a normal VM transition here because we want to 1254 // know after the patching is complete and any safepoint(s) are taken 1255 // if the calling nmethod was deoptimized. We do this by calling a 1256 // helper method which does the normal VM transition and when it 1257 // completes we can check for deoptimization. This simplifies the 1258 // assembly code in the cpu directories. 1259 // 1260 1261 int Runtime1::access_field_patching(JavaThread* thread) { 1262 // 1263 // NOTE: we are still in Java 1264 // 1265 Thread* THREAD = thread; 1266 debug_only(NoHandleMark nhm;) 1267 { 1268 // Enter VM mode 1269 1270 ResetNoHandleMark rnhm; 1271 patch_code(thread, access_field_patching_id); 1272 } 1273 // Back in JAVA, use no oops DON'T safepoint 1274 1275 // Return true if calling code is deoptimized 1276 1277 return caller_is_deopted(); 1278 JRT_END 1279 1280 1281 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id)) 1282 // for now we just print out the block id 1283 tty->print("%d ", block_id); 1284 JRT_END 1285 1286 1287 // Array copy return codes. 1288 enum { 1289 ac_failed = -1, // arraycopy failed 1290 ac_ok = 0 // arraycopy succeeded 1291 }; 1292 1293 1294 // Below length is the # elements copied. 1295 template <class T> int obj_arraycopy_work(oopDesc* src, T* src_addr, 1296 oopDesc* dst, T* dst_addr, 1297 int length) { 1298 1299 // For performance reasons, we assume we are using a card marking write 1300 // barrier. The assert will fail if this is not the case. 1301 // Note that we use the non-virtual inlineable variant of write_ref_array. 1302 BarrierSet* bs = Universe::heap()->barrier_set(); 1303 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); 1304 assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well."); 1305 if (src == dst) { 1306 // same object, no check 1307 bs->write_ref_array_pre(dst_addr, length); 1308 Copy::conjoint_oops_atomic(src_addr, dst_addr, length); 1309 bs->write_ref_array((HeapWord*)dst_addr, length); 1310 return ac_ok; 1311 } else { 1312 Klass* bound = ObjArrayKlass::cast(dst->klass())->element_klass(); 1313 Klass* stype = ObjArrayKlass::cast(src->klass())->element_klass(); 1314 if (stype == bound || stype->is_subtype_of(bound)) { 1315 // Elements are guaranteed to be subtypes, so no check necessary 1316 bs->write_ref_array_pre(dst_addr, length); 1317 Copy::conjoint_oops_atomic(src_addr, dst_addr, length); 1318 bs->write_ref_array((HeapWord*)dst_addr, length); 1319 return ac_ok; 1320 } 1321 } 1322 return ac_failed; 1323 } 1324 1325 // fast and direct copy of arrays; returning -1, means that an exception may be thrown 1326 // and we did not copy anything 1327 JRT_LEAF(int, Runtime1::arraycopy(oopDesc* src, int src_pos, oopDesc* dst, int dst_pos, int length)) 1328 #ifndef PRODUCT 1329 _generic_arraycopy_cnt++; // Slow-path oop array copy 1330 #endif 1331 1332 if (src == NULL || dst == NULL || src_pos < 0 || dst_pos < 0 || length < 0) return ac_failed; 1333 if (!dst->is_array() || !src->is_array()) return ac_failed; 1334 if ((unsigned int) arrayOop(src)->length() < (unsigned int)src_pos + (unsigned int)length) return ac_failed; 1335 if ((unsigned int) arrayOop(dst)->length() < (unsigned int)dst_pos + (unsigned int)length) return ac_failed; 1336 1337 if (length == 0) return ac_ok; 1338 if (src->is_typeArray()) { 1339 Klass* klass_oop = src->klass(); 1340 if (klass_oop != dst->klass()) return ac_failed; 1341 TypeArrayKlass* klass = TypeArrayKlass::cast(klass_oop); 1342 const int l2es = klass->log2_element_size(); 1343 const int ihs = klass->array_header_in_bytes() / wordSize; 1344 char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es); 1345 char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es); 1346 // Potential problem: memmove is not guaranteed to be word atomic 1347 // Revisit in Merlin 1348 memmove(dst_addr, src_addr, length << l2es); 1349 return ac_ok; 1350 } else if (src->is_objArray() && dst->is_objArray()) { 1351 if (UseCompressedOops) { 1352 narrowOop *src_addr = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos); 1353 narrowOop *dst_addr = objArrayOop(dst)->obj_at_addr<narrowOop>(dst_pos); 1354 return obj_arraycopy_work(src, src_addr, dst, dst_addr, length); 1355 } else { 1356 oop *src_addr = objArrayOop(src)->obj_at_addr<oop>(src_pos); 1357 oop *dst_addr = objArrayOop(dst)->obj_at_addr<oop>(dst_pos); 1358 return obj_arraycopy_work(src, src_addr, dst, dst_addr, length); 1359 } 1360 } 1361 return ac_failed; 1362 JRT_END 1363 1364 1365 JRT_LEAF(void, Runtime1::primitive_arraycopy(HeapWord* src, HeapWord* dst, int length)) 1366 #ifndef PRODUCT 1367 _primitive_arraycopy_cnt++; 1368 #endif 1369 1370 if (length == 0) return; 1371 // Not guaranteed to be word atomic, but that doesn't matter 1372 // for anything but an oop array, which is covered by oop_arraycopy. 1373 Copy::conjoint_jbytes(src, dst, length); 1374 JRT_END 1375 1376 JRT_LEAF(void, Runtime1::oop_arraycopy(HeapWord* src, HeapWord* dst, int num)) 1377 #ifndef PRODUCT 1378 _oop_arraycopy_cnt++; 1379 #endif 1380 1381 if (num == 0) return; 1382 BarrierSet* bs = Universe::heap()->barrier_set(); 1383 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); 1384 assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well."); 1385 if (UseCompressedOops) { 1386 bs->write_ref_array_pre((narrowOop*)dst, num); 1387 Copy::conjoint_oops_atomic((narrowOop*) src, (narrowOop*) dst, num); 1388 } else { 1389 bs->write_ref_array_pre((oop*)dst, num); 1390 Copy::conjoint_oops_atomic((oop*) src, (oop*) dst, num); 1391 } 1392 bs->write_ref_array(dst, num); 1393 JRT_END 1394 1395 1396 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj)) 1397 // had to return int instead of bool, otherwise there may be a mismatch 1398 // between the C calling convention and the Java one. 1399 // e.g., on x86, GCC may clear only %al when returning a bool false, but 1400 // JVM takes the whole %eax as the return value, which may misinterpret 1401 // the return value as a boolean true. 1402 1403 assert(mirror != NULL, "should null-check on mirror before calling"); 1404 Klass* k = java_lang_Class::as_Klass(mirror); 1405 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0; 1406 JRT_END 1407 1408 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread)) 1409 ResourceMark rm; 1410 1411 assert(!TieredCompilation, "incompatible with tiered compilation"); 1412 1413 RegisterMap reg_map(thread, false); 1414 frame runtime_frame = thread->last_frame(); 1415 frame caller_frame = runtime_frame.sender(®_map); 1416 1417 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); 1418 assert (nm != NULL, "no more nmethod?"); 1419 nm->make_not_entrant(); 1420 1421 methodHandle m(nm->method()); 1422 MethodData* mdo = m->method_data(); 1423 1424 if (mdo == NULL && !HAS_PENDING_EXCEPTION) { 1425 // Build an MDO. Ignore errors like OutOfMemory; 1426 // that simply means we won't have an MDO to update. 1427 Method::build_interpreter_method_data(m, THREAD); 1428 if (HAS_PENDING_EXCEPTION) { 1429 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here"); 1430 CLEAR_PENDING_EXCEPTION; 1431 } 1432 mdo = m->method_data(); 1433 } 1434 1435 if (mdo != NULL) { 1436 mdo->inc_trap_count(Deoptimization::Reason_none); 1437 } 1438 1439 if (TracePredicateFailedTraps) { 1440 stringStream ss1, ss2; 1441 vframeStream vfst(thread); 1442 methodHandle inlinee = methodHandle(vfst.method()); 1443 inlinee->print_short_name(&ss1); 1444 m->print_short_name(&ss2); 1445 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())); 1446 } 1447 1448 1449 Deoptimization::deoptimize_frame(thread, caller_frame.id()); 1450 1451 JRT_END 1452 1453 #ifndef PRODUCT 1454 void Runtime1::print_statistics() { 1455 tty->print_cr("C1 Runtime statistics:"); 1456 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr); 1457 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr); 1458 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr); 1459 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr); 1460 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr); 1461 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt); 1462 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt); 1463 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_cnt); 1464 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_cnt); 1465 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_cnt); 1466 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_cnt); 1467 tty->print_cr(" _primitive_arraycopy_cnt: %d", _primitive_arraycopy_cnt); 1468 tty->print_cr(" _oop_arraycopy_cnt (C): %d", Runtime1::_oop_arraycopy_cnt); 1469 tty->print_cr(" _oop_arraycopy_cnt (stub): %d", _oop_arraycopy_cnt); 1470 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt); 1471 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt); 1472 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt); 1473 1474 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt); 1475 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt); 1476 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt); 1477 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt); 1478 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt); 1479 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt); 1480 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt); 1481 1482 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count); 1483 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count); 1484 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count); 1485 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count); 1486 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count); 1487 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count); 1488 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count); 1489 tty->print_cr(" _throw_count: %d:", _throw_count); 1490 1491 SharedRuntime::print_ic_miss_histogram(); 1492 tty->cr(); 1493 } 1494 #endif // PRODUCT