compiler_driver.cc revision 9837939678bb5dcba178e5fb00ed59b5d14c8d9b
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "compiler_driver.h" 18 19#define ATRACE_TAG ATRACE_TAG_DALVIK 20#include <utils/Trace.h> 21 22#include <vector> 23#include <unistd.h> 24 25#include "base/stl_util.h" 26#include "base/timing_logger.h" 27#include "class_linker.h" 28#include "compiler_backend.h" 29#include "dex_compilation_unit.h" 30#include "dex_file-inl.h" 31#include "dex/verification_results.h" 32#include "dex/verified_method.h" 33#include "dex/quick/dex_file_method_inliner.h" 34#include "jni_internal.h" 35#include "object_utils.h" 36#include "runtime.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/space/space.h" 40#include "mirror/art_field-inl.h" 41#include "mirror/art_method-inl.h" 42#include "mirror/class_loader.h" 43#include "mirror/class-inl.h" 44#include "mirror/dex_cache-inl.h" 45#include "mirror/object-inl.h" 46#include "mirror/object_array-inl.h" 47#include "mirror/throwable.h" 48#include "scoped_thread_state_change.h" 49#include "ScopedLocalRef.h" 50#include "thread.h" 51#include "thread_pool.h" 52#include "trampolines/trampoline_compiler.h" 53#include "transaction.h" 54#include "verifier/method_verifier.h" 55#include "verifier/method_verifier-inl.h" 56 57namespace art { 58 59static double Percentage(size_t x, size_t y) { 60 return 100.0 * (static_cast<double>(x)) / (static_cast<double>(x + y)); 61} 62 63static void DumpStat(size_t x, size_t y, const char* str) { 64 if (x == 0 && y == 0) { 65 return; 66 } 67 LOG(INFO) << Percentage(x, y) << "% of " << str << " for " << (x + y) << " cases"; 68} 69 70class AOTCompilationStats { 71 public: 72 AOTCompilationStats() 73 : stats_lock_("AOT compilation statistics lock"), 74 types_in_dex_cache_(0), types_not_in_dex_cache_(0), 75 strings_in_dex_cache_(0), strings_not_in_dex_cache_(0), 76 resolved_types_(0), unresolved_types_(0), 77 resolved_instance_fields_(0), unresolved_instance_fields_(0), 78 resolved_local_static_fields_(0), resolved_static_fields_(0), unresolved_static_fields_(0), 79 type_based_devirtualization_(0), 80 safe_casts_(0), not_safe_casts_(0) { 81 for (size_t i = 0; i <= kMaxInvokeType; i++) { 82 resolved_methods_[i] = 0; 83 unresolved_methods_[i] = 0; 84 virtual_made_direct_[i] = 0; 85 direct_calls_to_boot_[i] = 0; 86 direct_methods_to_boot_[i] = 0; 87 } 88 } 89 90 void Dump() { 91 DumpStat(types_in_dex_cache_, types_not_in_dex_cache_, "types known to be in dex cache"); 92 DumpStat(strings_in_dex_cache_, strings_not_in_dex_cache_, "strings known to be in dex cache"); 93 DumpStat(resolved_types_, unresolved_types_, "types resolved"); 94 DumpStat(resolved_instance_fields_, unresolved_instance_fields_, "instance fields resolved"); 95 DumpStat(resolved_local_static_fields_ + resolved_static_fields_, unresolved_static_fields_, 96 "static fields resolved"); 97 DumpStat(resolved_local_static_fields_, resolved_static_fields_ + unresolved_static_fields_, 98 "static fields local to a class"); 99 DumpStat(safe_casts_, not_safe_casts_, "check-casts removed based on type information"); 100 // Note, the code below subtracts the stat value so that when added to the stat value we have 101 // 100% of samples. TODO: clean this up. 102 DumpStat(type_based_devirtualization_, 103 resolved_methods_[kVirtual] + unresolved_methods_[kVirtual] + 104 resolved_methods_[kInterface] + unresolved_methods_[kInterface] - 105 type_based_devirtualization_, 106 "virtual/interface calls made direct based on type information"); 107 108 for (size_t i = 0; i <= kMaxInvokeType; i++) { 109 std::ostringstream oss; 110 oss << static_cast<InvokeType>(i) << " methods were AOT resolved"; 111 DumpStat(resolved_methods_[i], unresolved_methods_[i], oss.str().c_str()); 112 if (virtual_made_direct_[i] > 0) { 113 std::ostringstream oss2; 114 oss2 << static_cast<InvokeType>(i) << " methods made direct"; 115 DumpStat(virtual_made_direct_[i], 116 resolved_methods_[i] + unresolved_methods_[i] - virtual_made_direct_[i], 117 oss2.str().c_str()); 118 } 119 if (direct_calls_to_boot_[i] > 0) { 120 std::ostringstream oss2; 121 oss2 << static_cast<InvokeType>(i) << " method calls are direct into boot"; 122 DumpStat(direct_calls_to_boot_[i], 123 resolved_methods_[i] + unresolved_methods_[i] - direct_calls_to_boot_[i], 124 oss2.str().c_str()); 125 } 126 if (direct_methods_to_boot_[i] > 0) { 127 std::ostringstream oss2; 128 oss2 << static_cast<InvokeType>(i) << " method calls have methods in boot"; 129 DumpStat(direct_methods_to_boot_[i], 130 resolved_methods_[i] + unresolved_methods_[i] - direct_methods_to_boot_[i], 131 oss2.str().c_str()); 132 } 133 } 134 } 135 136// Allow lossy statistics in non-debug builds. 137#ifndef NDEBUG 138#define STATS_LOCK() MutexLock mu(Thread::Current(), stats_lock_) 139#else 140#define STATS_LOCK() 141#endif 142 143 void TypeInDexCache() { 144 STATS_LOCK(); 145 types_in_dex_cache_++; 146 } 147 148 void TypeNotInDexCache() { 149 STATS_LOCK(); 150 types_not_in_dex_cache_++; 151 } 152 153 void StringInDexCache() { 154 STATS_LOCK(); 155 strings_in_dex_cache_++; 156 } 157 158 void StringNotInDexCache() { 159 STATS_LOCK(); 160 strings_not_in_dex_cache_++; 161 } 162 163 void TypeDoesntNeedAccessCheck() { 164 STATS_LOCK(); 165 resolved_types_++; 166 } 167 168 void TypeNeedsAccessCheck() { 169 STATS_LOCK(); 170 unresolved_types_++; 171 } 172 173 void ResolvedInstanceField() { 174 STATS_LOCK(); 175 resolved_instance_fields_++; 176 } 177 178 void UnresolvedInstanceField() { 179 STATS_LOCK(); 180 unresolved_instance_fields_++; 181 } 182 183 void ResolvedLocalStaticField() { 184 STATS_LOCK(); 185 resolved_local_static_fields_++; 186 } 187 188 void ResolvedStaticField() { 189 STATS_LOCK(); 190 resolved_static_fields_++; 191 } 192 193 void UnresolvedStaticField() { 194 STATS_LOCK(); 195 unresolved_static_fields_++; 196 } 197 198 // Indicate that type information from the verifier led to devirtualization. 199 void PreciseTypeDevirtualization() { 200 STATS_LOCK(); 201 type_based_devirtualization_++; 202 } 203 204 // Indicate that a method of the given type was resolved at compile time. 205 void ResolvedMethod(InvokeType type) { 206 DCHECK_LE(type, kMaxInvokeType); 207 STATS_LOCK(); 208 resolved_methods_[type]++; 209 } 210 211 // Indicate that a method of the given type was unresolved at compile time as it was in an 212 // unknown dex file. 213 void UnresolvedMethod(InvokeType type) { 214 DCHECK_LE(type, kMaxInvokeType); 215 STATS_LOCK(); 216 unresolved_methods_[type]++; 217 } 218 219 // Indicate that a type of virtual method dispatch has been converted into a direct method 220 // dispatch. 221 void VirtualMadeDirect(InvokeType type) { 222 DCHECK(type == kVirtual || type == kInterface || type == kSuper); 223 STATS_LOCK(); 224 virtual_made_direct_[type]++; 225 } 226 227 // Indicate that a method of the given type was able to call directly into boot. 228 void DirectCallsToBoot(InvokeType type) { 229 DCHECK_LE(type, kMaxInvokeType); 230 STATS_LOCK(); 231 direct_calls_to_boot_[type]++; 232 } 233 234 // Indicate that a method of the given type was able to be resolved directly from boot. 235 void DirectMethodsToBoot(InvokeType type) { 236 DCHECK_LE(type, kMaxInvokeType); 237 STATS_LOCK(); 238 direct_methods_to_boot_[type]++; 239 } 240 241 // A check-cast could be eliminated due to verifier type analysis. 242 void SafeCast() { 243 STATS_LOCK(); 244 safe_casts_++; 245 } 246 247 // A check-cast couldn't be eliminated due to verifier type analysis. 248 void NotASafeCast() { 249 STATS_LOCK(); 250 not_safe_casts_++; 251 } 252 253 private: 254 Mutex stats_lock_; 255 256 size_t types_in_dex_cache_; 257 size_t types_not_in_dex_cache_; 258 259 size_t strings_in_dex_cache_; 260 size_t strings_not_in_dex_cache_; 261 262 size_t resolved_types_; 263 size_t unresolved_types_; 264 265 size_t resolved_instance_fields_; 266 size_t unresolved_instance_fields_; 267 268 size_t resolved_local_static_fields_; 269 size_t resolved_static_fields_; 270 size_t unresolved_static_fields_; 271 // Type based devirtualization for invoke interface and virtual. 272 size_t type_based_devirtualization_; 273 274 size_t resolved_methods_[kMaxInvokeType + 1]; 275 size_t unresolved_methods_[kMaxInvokeType + 1]; 276 size_t virtual_made_direct_[kMaxInvokeType + 1]; 277 size_t direct_calls_to_boot_[kMaxInvokeType + 1]; 278 size_t direct_methods_to_boot_[kMaxInvokeType + 1]; 279 280 size_t safe_casts_; 281 size_t not_safe_casts_; 282 283 DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats); 284}; 285 286 287extern "C" art::CompiledMethod* ArtCompileDEX(art::CompilerDriver& compiler, 288 const art::DexFile::CodeItem* code_item, 289 uint32_t access_flags, 290 art::InvokeType invoke_type, 291 uint16_t class_def_idx, 292 uint32_t method_idx, 293 jobject class_loader, 294 const art::DexFile& dex_file); 295 296CompilerDriver::CompilerDriver(VerificationResults* verification_results, 297 DexFileToMethodInlinerMap* method_inliner_map, 298 CompilerBackend::Kind compiler_backend_kind, 299 InstructionSet instruction_set, 300 InstructionSetFeatures instruction_set_features, 301 bool image, DescriptorSet* image_classes, size_t thread_count, 302 bool dump_stats, bool dump_passes, CumulativeLogger* timer) 303 : verification_results_(verification_results), 304 method_inliner_map_(method_inliner_map), 305 compiler_backend_(CompilerBackend::Create(compiler_backend_kind)), 306 instruction_set_(instruction_set), 307 instruction_set_features_(instruction_set_features), 308 freezing_constructor_lock_("freezing constructor lock"), 309 compiled_classes_lock_("compiled classes lock"), 310 compiled_methods_lock_("compiled method lock"), 311 image_(image), 312 image_classes_(image_classes), 313 thread_count_(thread_count), 314 start_ns_(0), 315 stats_(new AOTCompilationStats), 316 dump_stats_(dump_stats), 317 dump_passes_(dump_passes), 318 timings_logger_(timer), 319 compiler_library_(NULL), 320 compiler_context_(NULL), 321 compiler_enable_auto_elf_loading_(NULL), 322 compiler_get_method_code_addr_(NULL), 323 support_boot_image_fixup_(instruction_set != kMips), 324 dedupe_code_("dedupe code"), 325 dedupe_mapping_table_("dedupe mapping table"), 326 dedupe_vmap_table_("dedupe vmap table"), 327 dedupe_gc_map_("dedupe gc map") { 328 329 CHECK_PTHREAD_CALL(pthread_key_create, (&tls_key_, NULL), "compiler tls key"); 330 331 dex_to_dex_compiler_ = reinterpret_cast<DexToDexCompilerFn>(ArtCompileDEX); 332 333 compiler_backend_->Init(*this); 334 335 CHECK(!Runtime::Current()->IsStarted()); 336 if (!image_) { 337 CHECK(image_classes_.get() == NULL); 338 } 339} 340 341std::vector<uint8_t>* CompilerDriver::DeduplicateCode(const std::vector<uint8_t>& code) { 342 return dedupe_code_.Add(Thread::Current(), code); 343} 344 345std::vector<uint8_t>* CompilerDriver::DeduplicateMappingTable(const std::vector<uint8_t>& code) { 346 return dedupe_mapping_table_.Add(Thread::Current(), code); 347} 348 349std::vector<uint8_t>* CompilerDriver::DeduplicateVMapTable(const std::vector<uint8_t>& code) { 350 return dedupe_vmap_table_.Add(Thread::Current(), code); 351} 352 353std::vector<uint8_t>* CompilerDriver::DeduplicateGCMap(const std::vector<uint8_t>& code) { 354 return dedupe_gc_map_.Add(Thread::Current(), code); 355} 356 357CompilerDriver::~CompilerDriver() { 358 Thread* self = Thread::Current(); 359 { 360 MutexLock mu(self, compiled_classes_lock_); 361 STLDeleteValues(&compiled_classes_); 362 } 363 { 364 MutexLock mu(self, compiled_methods_lock_); 365 STLDeleteValues(&compiled_methods_); 366 } 367 { 368 MutexLock mu(self, compiled_methods_lock_); 369 STLDeleteElements(&code_to_patch_); 370 } 371 { 372 MutexLock mu(self, compiled_methods_lock_); 373 STLDeleteElements(&methods_to_patch_); 374 } 375 { 376 MutexLock mu(self, compiled_methods_lock_); 377 STLDeleteElements(&classes_to_patch_); 378 } 379 CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key"); 380 compiler_backend_->UnInit(*this); 381} 382 383CompilerTls* CompilerDriver::GetTls() { 384 // Lazily create thread-local storage 385 CompilerTls* res = static_cast<CompilerTls*>(pthread_getspecific(tls_key_)); 386 if (res == NULL) { 387 res = new CompilerTls(); 388 CHECK_PTHREAD_CALL(pthread_setspecific, (tls_key_, res), "compiler tls"); 389 } 390 return res; 391} 392 393const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToInterpreterBridge() const { 394 return CreateTrampoline(instruction_set_, kInterpreterAbi, 395 INTERPRETER_ENTRYPOINT_OFFSET(pInterpreterToInterpreterBridge)); 396} 397 398const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToCompiledCodeBridge() const { 399 return CreateTrampoline(instruction_set_, kInterpreterAbi, 400 INTERPRETER_ENTRYPOINT_OFFSET(pInterpreterToCompiledCodeBridge)); 401} 402 403const std::vector<uint8_t>* CompilerDriver::CreateJniDlsymLookup() const { 404 return CreateTrampoline(instruction_set_, kJniAbi, JNI_ENTRYPOINT_OFFSET(pDlsymLookup)); 405} 406 407const std::vector<uint8_t>* CompilerDriver::CreatePortableImtConflictTrampoline() const { 408 return CreateTrampoline(instruction_set_, kPortableAbi, 409 PORTABLE_ENTRYPOINT_OFFSET(pPortableImtConflictTrampoline)); 410} 411 412const std::vector<uint8_t>* CompilerDriver::CreatePortableResolutionTrampoline() const { 413 return CreateTrampoline(instruction_set_, kPortableAbi, 414 PORTABLE_ENTRYPOINT_OFFSET(pPortableResolutionTrampoline)); 415} 416 417const std::vector<uint8_t>* CompilerDriver::CreatePortableToInterpreterBridge() const { 418 return CreateTrampoline(instruction_set_, kPortableAbi, 419 PORTABLE_ENTRYPOINT_OFFSET(pPortableToInterpreterBridge)); 420} 421 422const std::vector<uint8_t>* CompilerDriver::CreateQuickImtConflictTrampoline() const { 423 return CreateTrampoline(instruction_set_, kQuickAbi, 424 QUICK_ENTRYPOINT_OFFSET(pQuickImtConflictTrampoline)); 425} 426 427const std::vector<uint8_t>* CompilerDriver::CreateQuickResolutionTrampoline() const { 428 return CreateTrampoline(instruction_set_, kQuickAbi, 429 QUICK_ENTRYPOINT_OFFSET(pQuickResolutionTrampoline)); 430} 431 432const std::vector<uint8_t>* CompilerDriver::CreateQuickToInterpreterBridge() const { 433 return CreateTrampoline(instruction_set_, kQuickAbi, 434 QUICK_ENTRYPOINT_OFFSET(pQuickToInterpreterBridge)); 435} 436 437void CompilerDriver::CompileAll(jobject class_loader, 438 const std::vector<const DexFile*>& dex_files, 439 TimingLogger& timings) { 440 DCHECK(!Runtime::Current()->IsStarted()); 441 UniquePtr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", thread_count_ - 1)); 442 PreCompile(class_loader, dex_files, *thread_pool.get(), timings); 443 Compile(class_loader, dex_files, *thread_pool.get(), timings); 444 if (dump_stats_) { 445 stats_->Dump(); 446 } 447} 448 449static DexToDexCompilationLevel GetDexToDexCompilationlevel( 450 Thread* self, SirtRef<mirror::ClassLoader>& class_loader, const DexFile& dex_file, 451 const DexFile::ClassDef& class_def) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 452 const char* descriptor = dex_file.GetClassDescriptor(class_def); 453 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 454 mirror::Class* klass = class_linker->FindClass(self, descriptor, class_loader); 455 if (klass == NULL) { 456 CHECK(self->IsExceptionPending()); 457 self->ClearException(); 458 return kDontDexToDexCompile; 459 } 460 // The verifier can only run on "quick" instructions at runtime (see usage of 461 // FindAccessedFieldAtDexPc and FindInvokedMethodAtDexPc in ThrowNullPointerExceptionFromDexPC 462 // function). Since image classes can be verified again while compiling an application, 463 // we must prevent the DEX-to-DEX compiler from introducing them. 464 // TODO: find a way to enable "quick" instructions for image classes and remove this check. 465 bool compiling_image_classes = class_loader.get() == nullptr; 466 if (compiling_image_classes) { 467 return kRequired; 468 } else if (klass->IsVerified()) { 469 // Class is verified so we can enable DEX-to-DEX compilation for performance. 470 return kOptimize; 471 } else if (klass->IsCompileTimeVerified()) { 472 // Class verification has soft-failed. Anyway, ensure at least correctness. 473 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 474 return kRequired; 475 } else { 476 // Class verification has failed: do not run DEX-to-DEX compilation. 477 return kDontDexToDexCompile; 478 } 479} 480 481void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger& timings) { 482 DCHECK(!Runtime::Current()->IsStarted()); 483 Thread* self = Thread::Current(); 484 jobject jclass_loader; 485 const DexFile* dex_file; 486 uint16_t class_def_idx; 487 uint32_t method_idx = method->GetDexMethodIndex(); 488 uint32_t access_flags = method->GetAccessFlags(); 489 InvokeType invoke_type = method->GetInvokeType(); 490 { 491 ScopedObjectAccessUnchecked soa(self); 492 ScopedLocalRef<jobject> 493 local_class_loader(soa.Env(), 494 soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader())); 495 jclass_loader = soa.Env()->NewGlobalRef(local_class_loader.get()); 496 // Find the dex_file 497 MethodHelper mh(method); 498 dex_file = &mh.GetDexFile(); 499 class_def_idx = mh.GetClassDefIndex(); 500 } 501 const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset()); 502 self->TransitionFromRunnableToSuspended(kNative); 503 504 std::vector<const DexFile*> dex_files; 505 dex_files.push_back(dex_file); 506 507 UniquePtr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", 0U)); 508 PreCompile(jclass_loader, dex_files, *thread_pool.get(), timings); 509 510 // Can we run DEX-to-DEX compiler on this class ? 511 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 512 { 513 ScopedObjectAccess soa(Thread::Current()); 514 const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx); 515 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 516 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 517 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(self, class_loader, *dex_file, 518 class_def); 519 } 520 CompileMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx, jclass_loader, 521 *dex_file, dex_to_dex_compilation_level); 522 523 self->GetJniEnv()->DeleteGlobalRef(jclass_loader); 524 525 self->TransitionFromSuspendedToRunnable(); 526} 527 528void CompilerDriver::Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files, 529 ThreadPool& thread_pool, TimingLogger& timings) { 530 for (size_t i = 0; i != dex_files.size(); ++i) { 531 const DexFile* dex_file = dex_files[i]; 532 CHECK(dex_file != NULL); 533 ResolveDexFile(class_loader, *dex_file, thread_pool, timings); 534 } 535} 536 537void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 538 ThreadPool& thread_pool, TimingLogger& timings) { 539 LoadImageClasses(timings); 540 541 Resolve(class_loader, dex_files, thread_pool, timings); 542 543 Verify(class_loader, dex_files, thread_pool, timings); 544 545 InitializeClasses(class_loader, dex_files, thread_pool, timings); 546 547 UpdateImageClasses(timings); 548} 549 550bool CompilerDriver::IsImageClass(const char* descriptor) const { 551 if (!IsImage()) { 552 return true; 553 } else { 554 return image_classes_->find(descriptor) != image_classes_->end(); 555 } 556} 557 558static void ResolveExceptionsForMethod(MethodHelper* mh, 559 std::set<std::pair<uint16_t, const DexFile*> >& exceptions_to_resolve) 560 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 561 const DexFile::CodeItem* code_item = mh->GetCodeItem(); 562 if (code_item == NULL) { 563 return; // native or abstract method 564 } 565 if (code_item->tries_size_ == 0) { 566 return; // nothing to process 567 } 568 const byte* encoded_catch_handler_list = DexFile::GetCatchHandlerData(*code_item, 0); 569 size_t num_encoded_catch_handlers = DecodeUnsignedLeb128(&encoded_catch_handler_list); 570 for (size_t i = 0; i < num_encoded_catch_handlers; i++) { 571 int32_t encoded_catch_handler_size = DecodeSignedLeb128(&encoded_catch_handler_list); 572 bool has_catch_all = false; 573 if (encoded_catch_handler_size <= 0) { 574 encoded_catch_handler_size = -encoded_catch_handler_size; 575 has_catch_all = true; 576 } 577 for (int32_t j = 0; j < encoded_catch_handler_size; j++) { 578 uint16_t encoded_catch_handler_handlers_type_idx = 579 DecodeUnsignedLeb128(&encoded_catch_handler_list); 580 // Add to set of types to resolve if not already in the dex cache resolved types 581 if (!mh->IsResolvedTypeIdx(encoded_catch_handler_handlers_type_idx)) { 582 exceptions_to_resolve.insert( 583 std::pair<uint16_t, const DexFile*>(encoded_catch_handler_handlers_type_idx, 584 &mh->GetDexFile())); 585 } 586 // ignore address associated with catch handler 587 DecodeUnsignedLeb128(&encoded_catch_handler_list); 588 } 589 if (has_catch_all) { 590 // ignore catch all address 591 DecodeUnsignedLeb128(&encoded_catch_handler_list); 592 } 593 } 594} 595 596static bool ResolveCatchBlockExceptionsClassVisitor(mirror::Class* c, void* arg) 597 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 598 std::set<std::pair<uint16_t, const DexFile*> >* exceptions_to_resolve = 599 reinterpret_cast<std::set<std::pair<uint16_t, const DexFile*> >*>(arg); 600 MethodHelper mh; 601 for (size_t i = 0; i < c->NumVirtualMethods(); ++i) { 602 mirror::ArtMethod* m = c->GetVirtualMethod(i); 603 mh.ChangeMethod(m); 604 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 605 } 606 for (size_t i = 0; i < c->NumDirectMethods(); ++i) { 607 mirror::ArtMethod* m = c->GetDirectMethod(i); 608 mh.ChangeMethod(m); 609 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 610 } 611 return true; 612} 613 614static bool RecordImageClassesVisitor(mirror::Class* klass, void* arg) 615 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 616 CompilerDriver::DescriptorSet* image_classes = 617 reinterpret_cast<CompilerDriver::DescriptorSet*>(arg); 618 image_classes->insert(ClassHelper(klass).GetDescriptor()); 619 return true; 620} 621 622// Make a list of descriptors for classes to include in the image 623void CompilerDriver::LoadImageClasses(TimingLogger& timings) 624 LOCKS_EXCLUDED(Locks::mutator_lock_) { 625 if (!IsImage()) { 626 return; 627 } 628 629 timings.NewSplit("LoadImageClasses"); 630 // Make a first class to load all classes explicitly listed in the file 631 Thread* self = Thread::Current(); 632 ScopedObjectAccess soa(self); 633 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 634 for (auto it = image_classes_->begin(), end = image_classes_->end(); it != end;) { 635 const std::string& descriptor(*it); 636 SirtRef<mirror::Class> klass(self, class_linker->FindSystemClass(self, descriptor.c_str())); 637 if (klass.get() == NULL) { 638 VLOG(compiler) << "Failed to find class " << descriptor; 639 image_classes_->erase(it++); 640 self->ClearException(); 641 } else { 642 ++it; 643 } 644 } 645 646 // Resolve exception classes referenced by the loaded classes. The catch logic assumes 647 // exceptions are resolved by the verifier when there is a catch block in an interested method. 648 // Do this here so that exception classes appear to have been specified image classes. 649 std::set<std::pair<uint16_t, const DexFile*> > unresolved_exception_types; 650 SirtRef<mirror::Class> java_lang_Throwable(self, 651 class_linker->FindSystemClass(self, "Ljava/lang/Throwable;")); 652 do { 653 unresolved_exception_types.clear(); 654 class_linker->VisitClasses(ResolveCatchBlockExceptionsClassVisitor, 655 &unresolved_exception_types); 656 for (const std::pair<uint16_t, const DexFile*>& exception_type : unresolved_exception_types) { 657 uint16_t exception_type_idx = exception_type.first; 658 const DexFile* dex_file = exception_type.second; 659 SirtRef<mirror::DexCache> dex_cache(self, class_linker->FindDexCache(*dex_file)); 660 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 661 SirtRef<mirror::Class> klass(self, class_linker->ResolveType(*dex_file, exception_type_idx, 662 dex_cache, class_loader)); 663 if (klass.get() == NULL) { 664 const DexFile::TypeId& type_id = dex_file->GetTypeId(exception_type_idx); 665 const char* descriptor = dex_file->GetTypeDescriptor(type_id); 666 LOG(FATAL) << "Failed to resolve class " << descriptor; 667 } 668 DCHECK(java_lang_Throwable->IsAssignableFrom(klass.get())); 669 } 670 // Resolving exceptions may load classes that reference more exceptions, iterate until no 671 // more are found 672 } while (!unresolved_exception_types.empty()); 673 674 // We walk the roots looking for classes so that we'll pick up the 675 // above classes plus any classes them depend on such super 676 // classes, interfaces, and the required ClassLinker roots. 677 class_linker->VisitClasses(RecordImageClassesVisitor, image_classes_.get()); 678 679 CHECK_NE(image_classes_->size(), 0U); 680} 681 682static void MaybeAddToImageClasses(mirror::Class* klass, CompilerDriver::DescriptorSet* image_classes) 683 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 684 while (!klass->IsObjectClass()) { 685 ClassHelper kh(klass); 686 const char* descriptor = kh.GetDescriptor(); 687 std::pair<CompilerDriver::DescriptorSet::iterator, bool> result = 688 image_classes->insert(descriptor); 689 if (result.second) { 690 VLOG(compiler) << "Adding " << descriptor << " to image classes"; 691 } else { 692 return; 693 } 694 for (size_t i = 0; i < kh.NumDirectInterfaces(); ++i) { 695 MaybeAddToImageClasses(kh.GetDirectInterface(i), image_classes); 696 } 697 if (klass->IsArrayClass()) { 698 MaybeAddToImageClasses(klass->GetComponentType(), image_classes); 699 } 700 klass = klass->GetSuperClass(); 701 } 702} 703 704void CompilerDriver::FindClinitImageClassesCallback(mirror::Object* object, void* arg) { 705 DCHECK(object != NULL); 706 DCHECK(arg != NULL); 707 CompilerDriver* compiler_driver = reinterpret_cast<CompilerDriver*>(arg); 708 MaybeAddToImageClasses(object->GetClass(), compiler_driver->image_classes_.get()); 709} 710 711void CompilerDriver::UpdateImageClasses(TimingLogger& timings) { 712 if (IsImage()) { 713 timings.NewSplit("UpdateImageClasses"); 714 715 // Update image_classes_ with classes for objects created by <clinit> methods. 716 Thread* self = Thread::Current(); 717 const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); 718 gc::Heap* heap = Runtime::Current()->GetHeap(); 719 // TODO: Image spaces only? 720 ScopedObjectAccess soa(Thread::Current()); 721 WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 722 heap->VisitObjects(FindClinitImageClassesCallback, this); 723 self->EndAssertNoThreadSuspension(old_cause); 724 } 725} 726 727bool CompilerDriver::CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx) { 728 if (IsImage() && 729 IsImageClass(dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_))) { 730 if (kIsDebugBuild) { 731 ScopedObjectAccess soa(Thread::Current()); 732 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 733 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 734 CHECK(resolved_class != NULL); 735 } 736 stats_->TypeInDexCache(); 737 return true; 738 } else { 739 stats_->TypeNotInDexCache(); 740 return false; 741 } 742} 743 744bool CompilerDriver::CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, 745 uint32_t string_idx) { 746 // See also Compiler::ResolveDexFile 747 748 bool result = false; 749 if (IsImage()) { 750 // We resolve all const-string strings when building for the image. 751 ScopedObjectAccess soa(Thread::Current()); 752 SirtRef<mirror::DexCache> dex_cache(soa.Self(), Runtime::Current()->GetClassLinker()->FindDexCache(dex_file)); 753 Runtime::Current()->GetClassLinker()->ResolveString(dex_file, string_idx, dex_cache); 754 result = true; 755 } 756 if (result) { 757 stats_->StringInDexCache(); 758 } else { 759 stats_->StringNotInDexCache(); 760 } 761 return result; 762} 763 764bool CompilerDriver::CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file, 765 uint32_t type_idx, 766 bool* type_known_final, bool* type_known_abstract, 767 bool* equals_referrers_class) { 768 if (type_known_final != NULL) { 769 *type_known_final = false; 770 } 771 if (type_known_abstract != NULL) { 772 *type_known_abstract = false; 773 } 774 if (equals_referrers_class != NULL) { 775 *equals_referrers_class = false; 776 } 777 ScopedObjectAccess soa(Thread::Current()); 778 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 779 // Get type from dex cache assuming it was populated by the verifier 780 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 781 if (resolved_class == NULL) { 782 stats_->TypeNeedsAccessCheck(); 783 return false; // Unknown class needs access checks. 784 } 785 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 786 if (equals_referrers_class != NULL) { 787 *equals_referrers_class = (method_id.class_idx_ == type_idx); 788 } 789 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 790 if (referrer_class == NULL) { 791 stats_->TypeNeedsAccessCheck(); 792 return false; // Incomplete referrer knowledge needs access check. 793 } 794 // Perform access check, will return true if access is ok or false if we're going to have to 795 // check this at runtime (for example for class loaders). 796 bool result = referrer_class->CanAccess(resolved_class); 797 if (result) { 798 stats_->TypeDoesntNeedAccessCheck(); 799 if (type_known_final != NULL) { 800 *type_known_final = resolved_class->IsFinal() && !resolved_class->IsArrayClass(); 801 } 802 if (type_known_abstract != NULL) { 803 *type_known_abstract = resolved_class->IsAbstract() && !resolved_class->IsArrayClass(); 804 } 805 } else { 806 stats_->TypeNeedsAccessCheck(); 807 } 808 return result; 809} 810 811bool CompilerDriver::CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, 812 const DexFile& dex_file, 813 uint32_t type_idx) { 814 ScopedObjectAccess soa(Thread::Current()); 815 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 816 // Get type from dex cache assuming it was populated by the verifier. 817 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 818 if (resolved_class == NULL) { 819 stats_->TypeNeedsAccessCheck(); 820 return false; // Unknown class needs access checks. 821 } 822 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 823 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 824 if (referrer_class == NULL) { 825 stats_->TypeNeedsAccessCheck(); 826 return false; // Incomplete referrer knowledge needs access check. 827 } 828 // Perform access and instantiable checks, will return true if access is ok or false if we're 829 // going to have to check this at runtime (for example for class loaders). 830 bool result = referrer_class->CanAccess(resolved_class) && resolved_class->IsInstantiable(); 831 if (result) { 832 stats_->TypeDoesntNeedAccessCheck(); 833 } else { 834 stats_->TypeNeedsAccessCheck(); 835 } 836 return result; 837} 838 839bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx, 840 bool* is_type_initialized, bool* use_direct_type_ptr, 841 uintptr_t* direct_type_ptr) { 842 ScopedObjectAccess soa(Thread::Current()); 843 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 844 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 845 if (resolved_class == nullptr) { 846 return false; 847 } 848 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 849 if (compiling_boot) { 850 // boot -> boot class pointers. 851 // True if the class is in the image at boot compiling time. 852 const bool is_image_class = IsImage() && IsImageClass( 853 dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_)); 854 // True if pc relative load works. 855 const bool support_boot_image_fixup = GetSupportBootImageFixup(); 856 if (is_image_class && support_boot_image_fixup) { 857 *is_type_initialized = resolved_class->IsInitialized(); 858 *use_direct_type_ptr = false; 859 *direct_type_ptr = 0; 860 return true; 861 } else { 862 return false; 863 } 864 } else { 865 // True if the class is in the image at app compiling time. 866 const bool class_in_image = 867 Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace(); 868 if (class_in_image) { 869 // boot -> app class pointers. 870 *is_type_initialized = resolved_class->IsInitialized(); 871 *use_direct_type_ptr = true; 872 *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class); 873 return true; 874 } else { 875 // app -> app class pointers. 876 // Give up because app does not have an image and class 877 // isn't created at compile time. TODO: implement this 878 // if/when each app gets an image. 879 return false; 880 } 881 } 882} 883 884static mirror::Class* ComputeCompilingMethodsClass(ScopedObjectAccess& soa, 885 SirtRef<mirror::DexCache>& dex_cache, 886 const DexCompilationUnit* mUnit) 887 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 888 // The passed dex_cache is a hint, sanity check before asking the class linker that will take a 889 // lock. 890 if (dex_cache->GetDexFile() != mUnit->GetDexFile()) { 891 dex_cache.reset(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 892 } 893 SirtRef<mirror::ClassLoader> 894 class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 895 const DexFile::MethodId& referrer_method_id = 896 mUnit->GetDexFile()->GetMethodId(mUnit->GetDexMethodIndex()); 897 return mUnit->GetClassLinker()->ResolveType(*mUnit->GetDexFile(), referrer_method_id.class_idx_, 898 dex_cache, class_loader); 899} 900 901static mirror::ArtField* ComputeFieldReferencedFromCompilingMethod( 902 ScopedObjectAccess& soa, const DexCompilationUnit* mUnit, uint32_t field_idx, bool is_static) 903 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 904 SirtRef<mirror::DexCache> dex_cache(soa.Self(), mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 905 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 906 return mUnit->GetClassLinker()->ResolveField(*mUnit->GetDexFile(), field_idx, dex_cache, 907 class_loader, is_static); 908} 909 910static mirror::ArtMethod* ComputeMethodReferencedFromCompilingMethod(ScopedObjectAccess& soa, 911 const DexCompilationUnit* mUnit, 912 uint32_t method_idx, 913 InvokeType type) 914 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 915 SirtRef<mirror::DexCache> dex_cache(soa.Self(), mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 916 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 917 return mUnit->GetClassLinker()->ResolveMethod(*mUnit->GetDexFile(), method_idx, dex_cache, 918 class_loader, NULL, type); 919} 920 921bool CompilerDriver::ComputeSpecialAccessorInfo(uint32_t field_idx, bool is_put, 922 verifier::MethodVerifier* verifier, 923 InlineIGetIPutData* result) { 924 mirror::DexCache* dex_cache = verifier->GetDexCache(); 925 uint32_t method_idx = verifier->GetMethodReference().dex_method_index; 926 mirror::ArtMethod* method = dex_cache->GetResolvedMethod(method_idx); 927 mirror::ArtField* field = dex_cache->GetResolvedField(field_idx); 928 if (method == nullptr || field == nullptr || field->IsStatic()) { 929 return false; 930 } 931 mirror::Class* method_class = method->GetDeclaringClass(); 932 mirror::Class* field_class = field->GetDeclaringClass(); 933 if (!method_class->CanAccessResolvedField(field_class, field, dex_cache, field_idx) || 934 (is_put && field->IsFinal() && method_class != field_class)) { 935 return false; 936 } 937 DCHECK_GE(field->GetOffset().Int32Value(), 0); 938 result->field_idx = field_idx; 939 result->field_offset = field->GetOffset().Int32Value(); 940 result->is_volatile = field->IsVolatile(); 941 return true; 942} 943 944bool CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 945 bool is_put, int* field_offset, bool* is_volatile) { 946 ScopedObjectAccess soa(Thread::Current()); 947 // Conservative defaults. 948 *field_offset = -1; 949 *is_volatile = true; 950 // Try to resolve field and ignore if an Incompatible Class Change Error (ie is static). 951 mirror::ArtField* resolved_field = 952 ComputeFieldReferencedFromCompilingMethod(soa, mUnit, field_idx, false); 953 if (resolved_field != NULL && !resolved_field->IsStatic()) { 954 SirtRef<mirror::DexCache> dex_cache(soa.Self(), 955 resolved_field->GetDeclaringClass()->GetDexCache()); 956 mirror::Class* referrer_class = 957 ComputeCompilingMethodsClass(soa, dex_cache, mUnit); 958 if (referrer_class != NULL) { 959 mirror::Class* fields_class = resolved_field->GetDeclaringClass(); 960 bool access_ok = referrer_class->CanAccessResolvedField(fields_class, resolved_field, 961 dex_cache.get(), field_idx); 962 bool is_write_to_final_from_wrong_class = is_put && resolved_field->IsFinal() && 963 fields_class != referrer_class; 964 if (access_ok && !is_write_to_final_from_wrong_class) { 965 *field_offset = resolved_field->GetOffset().Int32Value(); 966 *is_volatile = resolved_field->IsVolatile(); 967 stats_->ResolvedInstanceField(); 968 return true; // Fast path. 969 } 970 } 971 } 972 // Clean up any exception left by field/type resolution 973 if (soa.Self()->IsExceptionPending()) { 974 soa.Self()->ClearException(); 975 } 976 stats_->UnresolvedInstanceField(); 977 return false; // Incomplete knowledge needs slow path. 978} 979 980bool CompilerDriver::ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 981 bool is_put, int* field_offset, int* storage_index, 982 bool* is_referrers_class, bool* is_volatile, 983 bool* is_initialized) { 984 ScopedObjectAccess soa(Thread::Current()); 985 // Conservative defaults. 986 *field_offset = -1; 987 *storage_index = -1; 988 *is_referrers_class = false; 989 *is_volatile = true; 990 *is_initialized = false; 991 // Try to resolve field and ignore if an Incompatible Class Change Error (ie isn't static). 992 mirror::ArtField* resolved_field = 993 ComputeFieldReferencedFromCompilingMethod(soa, mUnit, field_idx, true); 994 if (resolved_field != NULL && resolved_field->IsStatic()) { 995 SirtRef<mirror::DexCache> dex_cache(soa.Self(), resolved_field->GetDeclaringClass()->GetDexCache()); 996 mirror::Class* referrer_class = 997 ComputeCompilingMethodsClass(soa, dex_cache, mUnit); 998 if (referrer_class != NULL) { 999 mirror::Class* fields_class = resolved_field->GetDeclaringClass(); 1000 if (fields_class == referrer_class) { 1001 *is_referrers_class = true; // implies no worrying about class initialization 1002 *is_initialized = true; 1003 *field_offset = resolved_field->GetOffset().Int32Value(); 1004 *is_volatile = resolved_field->IsVolatile(); 1005 stats_->ResolvedLocalStaticField(); 1006 return true; // fast path 1007 } else { 1008 bool access_ok = referrer_class->CanAccessResolvedField(fields_class, resolved_field, 1009 dex_cache.get(), field_idx); 1010 bool is_write_to_final_from_wrong_class = is_put && resolved_field->IsFinal(); 1011 if (access_ok && !is_write_to_final_from_wrong_class) { 1012 // We have the resolved field, we must make it into a index for the referrer 1013 // in its static storage (which may fail if it doesn't have a slot for it) 1014 // TODO: for images we can elide the static storage base null check 1015 // if we know there's a non-null entry in the image 1016 mirror::DexCache* dex_cache = mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()); 1017 if (fields_class->GetDexCache() == dex_cache) { 1018 // common case where the dex cache of both the referrer and the field are the same, 1019 // no need to search the dex file 1020 *storage_index = fields_class->GetDexTypeIndex(); 1021 *field_offset = resolved_field->GetOffset().Int32Value(); 1022 *is_volatile = resolved_field->IsVolatile(); 1023 *is_initialized = fields_class->IsInitialized() && 1024 CanAssumeTypeIsPresentInDexCache(*mUnit->GetDexFile(), *storage_index); 1025 stats_->ResolvedStaticField(); 1026 return true; 1027 } 1028 // Search dex file for localized ssb index, may fail if field's class is a parent 1029 // of the class mentioned in the dex file and there is no dex cache entry. 1030 const DexFile::StringId* string_id = 1031 mUnit->GetDexFile()->FindStringId(FieldHelper(resolved_field).GetDeclaringClassDescriptor()); 1032 if (string_id != NULL) { 1033 const DexFile::TypeId* type_id = 1034 mUnit->GetDexFile()->FindTypeId(mUnit->GetDexFile()->GetIndexForStringId(*string_id)); 1035 if (type_id != NULL) { 1036 // medium path, needs check of static storage base being initialized 1037 *storage_index = mUnit->GetDexFile()->GetIndexForTypeId(*type_id); 1038 *field_offset = resolved_field->GetOffset().Int32Value(); 1039 *is_volatile = resolved_field->IsVolatile(); 1040 *is_initialized = fields_class->IsInitialized() && 1041 CanAssumeTypeIsPresentInDexCache(*mUnit->GetDexFile(), *storage_index); 1042 stats_->ResolvedStaticField(); 1043 return true; 1044 } 1045 } 1046 } 1047 } 1048 } 1049 } 1050 // Clean up any exception left by field/type resolution 1051 if (soa.Self()->IsExceptionPending()) { 1052 soa.Self()->ClearException(); 1053 } 1054 stats_->UnresolvedStaticField(); 1055 return false; // Incomplete knowledge needs slow path. 1056} 1057 1058void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type, 1059 bool no_guarantee_of_dex_cache_entry, 1060 mirror::Class* referrer_class, 1061 mirror::ArtMethod* method, 1062 bool update_stats, 1063 MethodReference* target_method, 1064 uintptr_t* direct_code, 1065 uintptr_t* direct_method) { 1066 // For direct and static methods compute possible direct_code and direct_method values, ie 1067 // an address for the Method* being invoked and an address of the code for that Method*. 1068 // For interface calls compute a value for direct_method that is the interface method being 1069 // invoked, so this can be passed to the out-of-line runtime support code. 1070 *direct_code = 0; 1071 *direct_method = 0; 1072 bool use_dex_cache = false; 1073 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 1074 if (compiler_backend_->IsPortable()) { 1075 if (sharp_type != kStatic && sharp_type != kDirect) { 1076 return; 1077 } 1078 use_dex_cache = true; 1079 } else { 1080 if (sharp_type != kStatic && sharp_type != kDirect) { 1081 return; 1082 } 1083 // TODO: support patching on all architectures. 1084 use_dex_cache = compiling_boot && !support_boot_image_fixup_; 1085 } 1086 bool method_code_in_boot = (method->GetDeclaringClass()->GetClassLoader() == nullptr); 1087 if (!use_dex_cache) { 1088 if (!method_code_in_boot) { 1089 use_dex_cache = true; 1090 } else { 1091 bool has_clinit_trampoline = 1092 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 1093 if (has_clinit_trampoline && (method->GetDeclaringClass() != referrer_class)) { 1094 // Ensure we run the clinit trampoline unless we are invoking a static method in the same 1095 // class. 1096 use_dex_cache = true; 1097 } 1098 } 1099 } 1100 if (update_stats && method_code_in_boot) { 1101 stats_->DirectCallsToBoot(*type); 1102 stats_->DirectMethodsToBoot(*type); 1103 } 1104 if (!use_dex_cache && compiling_boot) { 1105 MethodHelper mh(method); 1106 if (!IsImageClass(mh.GetDeclaringClassDescriptor())) { 1107 // We can only branch directly to Methods that are resolved in the DexCache. 1108 // Otherwise we won't invoke the resolution trampoline. 1109 use_dex_cache = true; 1110 } 1111 } 1112 // The method is defined not within this dex file. We need a dex cache slot within the current 1113 // dex file or direct pointers. 1114 bool must_use_direct_pointers = false; 1115 if (target_method->dex_file == method->GetDeclaringClass()->GetDexCache()->GetDexFile()) { 1116 target_method->dex_method_index = method->GetDexMethodIndex(); 1117 } else { 1118 // TODO: support patching from one dex file to another in the boot image. 1119 use_dex_cache = use_dex_cache || compiling_boot; 1120 if (no_guarantee_of_dex_cache_entry) { 1121 // See if the method is also declared in this dex cache. 1122 uint32_t dex_method_idx = MethodHelper(method).FindDexMethodIndexInOtherDexFile( 1123 *target_method->dex_file, target_method->dex_method_index); 1124 if (dex_method_idx != DexFile::kDexNoIndex) { 1125 target_method->dex_method_index = dex_method_idx; 1126 } else { 1127 must_use_direct_pointers = true; 1128 } 1129 } 1130 } 1131 if (use_dex_cache) { 1132 if (must_use_direct_pointers) { 1133 // Fail. Test above showed the only safe dispatch was via the dex cache, however, the direct 1134 // pointers are required as the dex cache lacks an appropriate entry. 1135 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1136 } else { 1137 *type = sharp_type; 1138 } 1139 } else { 1140 if (compiling_boot) { 1141 *type = sharp_type; 1142 *direct_method = -1; 1143 *direct_code = -1; 1144 } else { 1145 bool method_in_image = 1146 Runtime::Current()->GetHeap()->FindSpaceFromObject(method, false)->IsImageSpace(); 1147 if (method_in_image) { 1148 CHECK(!method->IsAbstract()); 1149 *type = sharp_type; 1150 *direct_method = reinterpret_cast<uintptr_t>(method); 1151 *direct_code = compiler_backend_->GetEntryPointOf(method); 1152 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1153 target_method->dex_method_index = method->GetDexMethodIndex(); 1154 } else if (!must_use_direct_pointers) { 1155 // Set the code and rely on the dex cache for the method. 1156 *type = sharp_type; 1157 *direct_code = compiler_backend_->GetEntryPointOf(method); 1158 } else { 1159 // Direct pointers were required but none were available. 1160 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1161 } 1162 } 1163 } 1164} 1165 1166bool CompilerDriver::ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc, 1167 bool update_stats, bool enable_devirtualization, 1168 InvokeType* invoke_type, MethodReference* target_method, 1169 int* vtable_idx, uintptr_t* direct_code, 1170 uintptr_t* direct_method) { 1171 ScopedObjectAccess soa(Thread::Current()); 1172 *vtable_idx = -1; 1173 *direct_code = 0; 1174 *direct_method = 0; 1175 mirror::ArtMethod* resolved_method = 1176 ComputeMethodReferencedFromCompilingMethod(soa, mUnit, target_method->dex_method_index, 1177 *invoke_type); 1178 if (resolved_method != NULL) { 1179 if (*invoke_type == kVirtual || *invoke_type == kSuper) { 1180 *vtable_idx = resolved_method->GetMethodIndex(); 1181 } else if (*invoke_type == kInterface) { 1182 *vtable_idx = resolved_method->GetDexMethodIndex(); 1183 } 1184 // Don't try to fast-path if we don't understand the caller's class or this appears to be an 1185 // Incompatible Class Change Error. 1186 SirtRef<mirror::DexCache> dex_cache(soa.Self(), resolved_method->GetDeclaringClass()->GetDexCache()); 1187 mirror::Class* referrer_class = 1188 ComputeCompilingMethodsClass(soa, dex_cache, mUnit); 1189 bool icce = resolved_method->CheckIncompatibleClassChange(*invoke_type); 1190 if (referrer_class != NULL && !icce) { 1191 mirror::Class* methods_class = resolved_method->GetDeclaringClass(); 1192 if (referrer_class->CanAccessResolvedMethod(methods_class, resolved_method, dex_cache.get(), 1193 target_method->dex_method_index)) { 1194 const bool enableFinalBasedSharpening = enable_devirtualization; 1195 // Sharpen a virtual call into a direct call when the target is known not to have been 1196 // overridden (ie is final). 1197 bool can_sharpen_virtual_based_on_type = 1198 (*invoke_type == kVirtual) && (resolved_method->IsFinal() || methods_class->IsFinal()); 1199 // For invoke-super, ensure the vtable index will be correct to dispatch in the vtable of 1200 // the super class. 1201 bool can_sharpen_super_based_on_type = (*invoke_type == kSuper) && 1202 (referrer_class != methods_class) && referrer_class->IsSubClass(methods_class) && 1203 resolved_method->GetMethodIndex() < methods_class->GetVTable()->GetLength() && 1204 (methods_class->GetVTable()->Get(resolved_method->GetMethodIndex()) == resolved_method); 1205 1206 if (enableFinalBasedSharpening && (can_sharpen_virtual_based_on_type || 1207 can_sharpen_super_based_on_type)) { 1208 // Sharpen a virtual call into a direct call. The method_idx is into the DexCache 1209 // associated with target_method->dex_file. 1210 CHECK(target_method->dex_file == mUnit->GetDexFile()); 1211 DCHECK(dex_cache.get() == mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 1212 CHECK(dex_cache->GetResolvedMethod(target_method->dex_method_index) == 1213 resolved_method) << PrettyMethod(resolved_method); 1214 InvokeType orig_invoke_type = *invoke_type; 1215 GetCodeAndMethodForDirectCall(invoke_type, kDirect, false, referrer_class, resolved_method, 1216 update_stats, target_method, direct_code, direct_method); 1217 if (update_stats && (*invoke_type == kDirect)) { 1218 stats_->ResolvedMethod(orig_invoke_type); 1219 stats_->VirtualMadeDirect(orig_invoke_type); 1220 } 1221 DCHECK_NE(*invoke_type, kSuper) << PrettyMethod(resolved_method); 1222 return true; 1223 } 1224 const bool enableVerifierBasedSharpening = enable_devirtualization; 1225 if (enableVerifierBasedSharpening && (*invoke_type == kVirtual || 1226 *invoke_type == kInterface)) { 1227 // Did the verifier record a more precise invoke target based on its type information? 1228 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1229 const MethodReference* devirt_map_target = 1230 mUnit->GetVerifiedMethod()->GetDevirtTarget(dex_pc); 1231 if (devirt_map_target != NULL) { 1232 SirtRef<mirror::DexCache> target_dex_cache(soa.Self(), mUnit->GetClassLinker()->FindDexCache(*devirt_map_target->dex_file)); 1233 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 1234 mirror::ArtMethod* called_method = 1235 mUnit->GetClassLinker()->ResolveMethod(*devirt_map_target->dex_file, 1236 devirt_map_target->dex_method_index, 1237 target_dex_cache, class_loader, NULL, 1238 kVirtual); 1239 CHECK(called_method != NULL); 1240 CHECK(!called_method->IsAbstract()); 1241 InvokeType orig_invoke_type = *invoke_type; 1242 GetCodeAndMethodForDirectCall(invoke_type, kDirect, true, referrer_class, called_method, 1243 update_stats, target_method, direct_code, direct_method); 1244 if (update_stats && (*invoke_type == kDirect)) { 1245 stats_->ResolvedMethod(orig_invoke_type); 1246 stats_->VirtualMadeDirect(orig_invoke_type); 1247 stats_->PreciseTypeDevirtualization(); 1248 } 1249 DCHECK_NE(*invoke_type, kSuper); 1250 return true; 1251 } 1252 } 1253 if (*invoke_type == kSuper) { 1254 // Unsharpened super calls are suspicious so go slow-path. 1255 } else { 1256 // Sharpening failed so generate a regular resolved method dispatch. 1257 if (update_stats) { 1258 stats_->ResolvedMethod(*invoke_type); 1259 } 1260 GetCodeAndMethodForDirectCall(invoke_type, *invoke_type, false, referrer_class, resolved_method, 1261 update_stats, target_method, direct_code, direct_method); 1262 return true; 1263 } 1264 } 1265 } 1266 } 1267 // Clean up any exception left by method/invoke_type resolution 1268 if (soa.Self()->IsExceptionPending()) { 1269 soa.Self()->ClearException(); 1270 } 1271 if (update_stats) { 1272 stats_->UnresolvedMethod(*invoke_type); 1273 } 1274 return false; // Incomplete knowledge needs slow path. 1275} 1276 1277const VerifiedMethod* CompilerDriver::GetVerifiedMethod(const DexFile* dex_file, 1278 uint32_t method_idx) const { 1279 MethodReference ref(dex_file, method_idx); 1280 return verification_results_->GetVerifiedMethod(ref); 1281} 1282 1283bool CompilerDriver::IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc) { 1284 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1285 bool result = mUnit->GetVerifiedMethod()->IsSafeCast(dex_pc); 1286 if (result) { 1287 stats_->SafeCast(); 1288 } else { 1289 stats_->NotASafeCast(); 1290 } 1291 return result; 1292} 1293 1294 1295void CompilerDriver::AddCodePatch(const DexFile* dex_file, 1296 uint16_t referrer_class_def_idx, 1297 uint32_t referrer_method_idx, 1298 InvokeType referrer_invoke_type, 1299 uint32_t target_method_idx, 1300 InvokeType target_invoke_type, 1301 size_t literal_offset) { 1302 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1303 code_to_patch_.push_back(new CallPatchInformation(dex_file, 1304 referrer_class_def_idx, 1305 referrer_method_idx, 1306 referrer_invoke_type, 1307 target_method_idx, 1308 target_invoke_type, 1309 literal_offset)); 1310} 1311void CompilerDriver::AddRelativeCodePatch(const DexFile* dex_file, 1312 uint16_t referrer_class_def_idx, 1313 uint32_t referrer_method_idx, 1314 InvokeType referrer_invoke_type, 1315 uint32_t target_method_idx, 1316 InvokeType target_invoke_type, 1317 size_t literal_offset, 1318 int32_t pc_relative_offset) { 1319 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1320 code_to_patch_.push_back(new RelativeCallPatchInformation(dex_file, 1321 referrer_class_def_idx, 1322 referrer_method_idx, 1323 referrer_invoke_type, 1324 target_method_idx, 1325 target_invoke_type, 1326 literal_offset, 1327 pc_relative_offset)); 1328} 1329void CompilerDriver::AddMethodPatch(const DexFile* dex_file, 1330 uint16_t referrer_class_def_idx, 1331 uint32_t referrer_method_idx, 1332 InvokeType referrer_invoke_type, 1333 uint32_t target_method_idx, 1334 InvokeType target_invoke_type, 1335 size_t literal_offset) { 1336 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1337 methods_to_patch_.push_back(new CallPatchInformation(dex_file, 1338 referrer_class_def_idx, 1339 referrer_method_idx, 1340 referrer_invoke_type, 1341 target_method_idx, 1342 target_invoke_type, 1343 literal_offset)); 1344} 1345void CompilerDriver::AddClassPatch(const DexFile* dex_file, 1346 uint16_t referrer_class_def_idx, 1347 uint32_t referrer_method_idx, 1348 uint32_t target_type_idx, 1349 size_t literal_offset) { 1350 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1351 classes_to_patch_.push_back(new TypePatchInformation(dex_file, 1352 referrer_class_def_idx, 1353 referrer_method_idx, 1354 target_type_idx, 1355 literal_offset)); 1356} 1357 1358class ParallelCompilationManager { 1359 public: 1360 typedef void Callback(const ParallelCompilationManager* manager, size_t index); 1361 1362 ParallelCompilationManager(ClassLinker* class_linker, 1363 jobject class_loader, 1364 CompilerDriver* compiler, 1365 const DexFile* dex_file, 1366 ThreadPool& thread_pool) 1367 : index_(0), 1368 class_linker_(class_linker), 1369 class_loader_(class_loader), 1370 compiler_(compiler), 1371 dex_file_(dex_file), 1372 thread_pool_(&thread_pool) {} 1373 1374 ClassLinker* GetClassLinker() const { 1375 CHECK(class_linker_ != NULL); 1376 return class_linker_; 1377 } 1378 1379 jobject GetClassLoader() const { 1380 return class_loader_; 1381 } 1382 1383 CompilerDriver* GetCompiler() const { 1384 CHECK(compiler_ != NULL); 1385 return compiler_; 1386 } 1387 1388 const DexFile* GetDexFile() const { 1389 CHECK(dex_file_ != NULL); 1390 return dex_file_; 1391 } 1392 1393 void ForAll(size_t begin, size_t end, Callback callback, size_t work_units) { 1394 Thread* self = Thread::Current(); 1395 self->AssertNoPendingException(); 1396 CHECK_GT(work_units, 0U); 1397 1398 index_ = begin; 1399 for (size_t i = 0; i < work_units; ++i) { 1400 thread_pool_->AddTask(self, new ForAllClosure(this, end, callback)); 1401 } 1402 thread_pool_->StartWorkers(self); 1403 1404 // Ensure we're suspended while we're blocked waiting for the other threads to finish (worker 1405 // thread destructor's called below perform join). 1406 CHECK_NE(self->GetState(), kRunnable); 1407 1408 // Wait for all the worker threads to finish. 1409 thread_pool_->Wait(self, true, false); 1410 } 1411 1412 size_t NextIndex() { 1413 return index_.FetchAndAdd(1); 1414 } 1415 1416 private: 1417 class ForAllClosure : public Task { 1418 public: 1419 ForAllClosure(ParallelCompilationManager* manager, size_t end, Callback* callback) 1420 : manager_(manager), 1421 end_(end), 1422 callback_(callback) {} 1423 1424 virtual void Run(Thread* self) { 1425 while (true) { 1426 const size_t index = manager_->NextIndex(); 1427 if (UNLIKELY(index >= end_)) { 1428 break; 1429 } 1430 callback_(manager_, index); 1431 self->AssertNoPendingException(); 1432 } 1433 } 1434 1435 virtual void Finalize() { 1436 delete this; 1437 } 1438 1439 private: 1440 ParallelCompilationManager* const manager_; 1441 const size_t end_; 1442 Callback* const callback_; 1443 }; 1444 1445 AtomicInteger index_; 1446 ClassLinker* const class_linker_; 1447 const jobject class_loader_; 1448 CompilerDriver* const compiler_; 1449 const DexFile* const dex_file_; 1450 ThreadPool* const thread_pool_; 1451 1452 DISALLOW_COPY_AND_ASSIGN(ParallelCompilationManager); 1453}; 1454 1455// Return true if the class should be skipped during compilation. 1456// 1457// The first case where we skip is for redundant class definitions in 1458// the boot classpath. We skip all but the first definition in that case. 1459// 1460// The second case where we skip is when an app bundles classes found 1461// in the boot classpath. Since at runtime we will select the class from 1462// the boot classpath, we ignore the one from the app. 1463static bool SkipClass(ClassLinker* class_linker, jobject class_loader, const DexFile& dex_file, 1464 const DexFile::ClassDef& class_def) { 1465 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1466 if (class_loader == NULL) { 1467 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, class_linker->GetBootClassPath()); 1468 CHECK(pair.second != NULL); 1469 if (pair.first != &dex_file) { 1470 LOG(WARNING) << "Skipping class " << descriptor << " from " << dex_file.GetLocation() 1471 << " previously found in " << pair.first->GetLocation(); 1472 return true; 1473 } 1474 return false; 1475 } 1476 return class_linker->IsInBootClassPath(descriptor); 1477} 1478 1479// A fast version of SkipClass above if the class pointer is available 1480// that avoids the expensive FindInClassPath search. 1481static bool SkipClass(jobject class_loader, const DexFile& dex_file, mirror::Class* klass) 1482 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1483 DCHECK(klass != NULL); 1484 const DexFile& original_dex_file = *klass->GetDexCache()->GetDexFile(); 1485 if (&dex_file != &original_dex_file) { 1486 if (class_loader == NULL) { 1487 LOG(WARNING) << "Skipping class " << PrettyDescriptor(klass) << " from " 1488 << dex_file.GetLocation() << " previously found in " 1489 << original_dex_file.GetLocation(); 1490 } 1491 return true; 1492 } 1493 return false; 1494} 1495 1496static void ResolveClassFieldsAndMethods(const ParallelCompilationManager* manager, 1497 size_t class_def_index) 1498 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1499 ATRACE_CALL(); 1500 Thread* self = Thread::Current(); 1501 jobject jclass_loader = manager->GetClassLoader(); 1502 const DexFile& dex_file = *manager->GetDexFile(); 1503 ClassLinker* class_linker = manager->GetClassLinker(); 1504 1505 // If an instance field is final then we need to have a barrier on the return, static final 1506 // fields are assigned within the lock held for class initialization. Conservatively assume 1507 // constructor barriers are always required. 1508 bool requires_constructor_barrier = true; 1509 1510 // Method and Field are the worst. We can't resolve without either 1511 // context from the code use (to disambiguate virtual vs direct 1512 // method and instance vs static field) or from class 1513 // definitions. While the compiler will resolve what it can as it 1514 // needs it, here we try to resolve fields and methods used in class 1515 // definitions, since many of them many never be referenced by 1516 // generated code. 1517 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1518 if (!SkipClass(class_linker, jclass_loader, dex_file, class_def)) { 1519 ScopedObjectAccess soa(self); 1520 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1521 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1522 // Resolve the class. 1523 mirror::Class* klass = class_linker->ResolveType(dex_file, class_def.class_idx_, dex_cache, 1524 class_loader); 1525 bool resolve_fields_and_methods; 1526 if (klass == NULL) { 1527 // Class couldn't be resolved, for example, super-class is in a different dex file. Don't 1528 // attempt to resolve methods and fields when there is no declaring class. 1529 CHECK(soa.Self()->IsExceptionPending()); 1530 soa.Self()->ClearException(); 1531 resolve_fields_and_methods = false; 1532 } else { 1533 resolve_fields_and_methods = manager->GetCompiler()->IsImage(); 1534 } 1535 // Note the class_data pointer advances through the headers, 1536 // static fields, instance fields, direct methods, and virtual 1537 // methods. 1538 const byte* class_data = dex_file.GetClassData(class_def); 1539 if (class_data == NULL) { 1540 // Empty class such as a marker interface. 1541 requires_constructor_barrier = false; 1542 } else { 1543 ClassDataItemIterator it(dex_file, class_data); 1544 while (it.HasNextStaticField()) { 1545 if (resolve_fields_and_methods) { 1546 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1547 dex_cache, class_loader, true); 1548 if (field == NULL) { 1549 CHECK(soa.Self()->IsExceptionPending()); 1550 soa.Self()->ClearException(); 1551 } 1552 } 1553 it.Next(); 1554 } 1555 // We require a constructor barrier if there are final instance fields. 1556 requires_constructor_barrier = false; 1557 while (it.HasNextInstanceField()) { 1558 if ((it.GetMemberAccessFlags() & kAccFinal) != 0) { 1559 requires_constructor_barrier = true; 1560 } 1561 if (resolve_fields_and_methods) { 1562 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1563 dex_cache, class_loader, false); 1564 if (field == NULL) { 1565 CHECK(soa.Self()->IsExceptionPending()); 1566 soa.Self()->ClearException(); 1567 } 1568 } 1569 it.Next(); 1570 } 1571 if (resolve_fields_and_methods) { 1572 while (it.HasNextDirectMethod()) { 1573 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1574 dex_cache, class_loader, NULL, 1575 it.GetMethodInvokeType(class_def)); 1576 if (method == NULL) { 1577 CHECK(soa.Self()->IsExceptionPending()); 1578 soa.Self()->ClearException(); 1579 } 1580 it.Next(); 1581 } 1582 while (it.HasNextVirtualMethod()) { 1583 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1584 dex_cache, class_loader, NULL, 1585 it.GetMethodInvokeType(class_def)); 1586 if (method == NULL) { 1587 CHECK(soa.Self()->IsExceptionPending()); 1588 soa.Self()->ClearException(); 1589 } 1590 it.Next(); 1591 } 1592 DCHECK(!it.HasNext()); 1593 } 1594 } 1595 } 1596 if (requires_constructor_barrier) { 1597 manager->GetCompiler()->AddRequiresConstructorBarrier(self, &dex_file, class_def_index); 1598 } 1599} 1600 1601static void ResolveType(const ParallelCompilationManager* manager, size_t type_idx) 1602 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1603 // Class derived values are more complicated, they require the linker and loader. 1604 ScopedObjectAccess soa(Thread::Current()); 1605 ClassLinker* class_linker = manager->GetClassLinker(); 1606 const DexFile& dex_file = *manager->GetDexFile(); 1607 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1608 SirtRef<mirror::ClassLoader> class_loader( 1609 soa.Self(), soa.Decode<mirror::ClassLoader*>(manager->GetClassLoader())); 1610 mirror::Class* klass = class_linker->ResolveType(dex_file, type_idx, dex_cache, class_loader); 1611 1612 if (klass == NULL) { 1613 CHECK(soa.Self()->IsExceptionPending()); 1614 mirror::Throwable* exception = soa.Self()->GetException(NULL); 1615 VLOG(compiler) << "Exception during type resolution: " << exception->Dump(); 1616 if (strcmp("Ljava/lang/OutOfMemoryError;", 1617 ClassHelper(exception->GetClass()).GetDescriptor()) == 0) { 1618 // There's little point continuing compilation if the heap is exhausted. 1619 LOG(FATAL) << "Out of memory during type resolution for compilation"; 1620 } 1621 soa.Self()->ClearException(); 1622 } 1623} 1624 1625void CompilerDriver::ResolveDexFile(jobject class_loader, const DexFile& dex_file, 1626 ThreadPool& thread_pool, TimingLogger& timings) { 1627 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1628 1629 // TODO: we could resolve strings here, although the string table is largely filled with class 1630 // and method names. 1631 1632 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, thread_pool); 1633 if (IsImage()) { 1634 // For images we resolve all types, such as array, whereas for applications just those with 1635 // classdefs are resolved by ResolveClassFieldsAndMethods. 1636 timings.NewSplit("Resolve Types"); 1637 context.ForAll(0, dex_file.NumTypeIds(), ResolveType, thread_count_); 1638 } 1639 1640 timings.NewSplit("Resolve MethodsAndFields"); 1641 context.ForAll(0, dex_file.NumClassDefs(), ResolveClassFieldsAndMethods, thread_count_); 1642} 1643 1644void CompilerDriver::Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1645 ThreadPool& thread_pool, TimingLogger& timings) { 1646 for (size_t i = 0; i != dex_files.size(); ++i) { 1647 const DexFile* dex_file = dex_files[i]; 1648 CHECK(dex_file != NULL); 1649 VerifyDexFile(class_loader, *dex_file, thread_pool, timings); 1650 } 1651} 1652 1653static void VerifyClass(const ParallelCompilationManager* manager, size_t class_def_index) 1654 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1655 ATRACE_CALL(); 1656 ScopedObjectAccess soa(Thread::Current()); 1657 const DexFile& dex_file = *manager->GetDexFile(); 1658 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1659 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1660 ClassLinker* class_linker = manager->GetClassLinker(); 1661 jobject jclass_loader = manager->GetClassLoader(); 1662 SirtRef<mirror::ClassLoader> class_loader( 1663 soa.Self(), soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1664 SirtRef<mirror::Class> klass(soa.Self(), class_linker->FindClass(soa.Self(), descriptor, 1665 class_loader)); 1666 if (klass.get() == nullptr) { 1667 CHECK(soa.Self()->IsExceptionPending()); 1668 soa.Self()->ClearException(); 1669 1670 /* 1671 * At compile time, we can still structurally verify the class even if FindClass fails. 1672 * This is to ensure the class is structurally sound for compilation. An unsound class 1673 * will be rejected by the verifier and later skipped during compilation in the compiler. 1674 */ 1675 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1676 std::string error_msg; 1677 if (verifier::MethodVerifier::VerifyClass(&dex_file, dex_cache, class_loader, &class_def, true, 1678 &error_msg) == 1679 verifier::MethodVerifier::kHardFailure) { 1680 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(descriptor) 1681 << " because: " << error_msg; 1682 } 1683 } else if (!SkipClass(jclass_loader, dex_file, klass.get())) { 1684 CHECK(klass->IsResolved()) << PrettyClass(klass.get()); 1685 class_linker->VerifyClass(klass); 1686 1687 if (klass->IsErroneous()) { 1688 // ClassLinker::VerifyClass throws, which isn't useful in the compiler. 1689 CHECK(soa.Self()->IsExceptionPending()); 1690 soa.Self()->ClearException(); 1691 } 1692 1693 CHECK(klass->IsCompileTimeVerified() || klass->IsErroneous()) 1694 << PrettyDescriptor(klass.get()) << ": state=" << klass->GetStatus(); 1695 } 1696 soa.Self()->AssertNoPendingException(); 1697} 1698 1699void CompilerDriver::VerifyDexFile(jobject class_loader, const DexFile& dex_file, 1700 ThreadPool& thread_pool, TimingLogger& timings) { 1701 timings.NewSplit("Verify Dex File"); 1702 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1703 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, thread_pool); 1704 context.ForAll(0, dex_file.NumClassDefs(), VerifyClass, thread_count_); 1705} 1706 1707static void InitializeClass(const ParallelCompilationManager* manager, size_t class_def_index) 1708 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1709 ATRACE_CALL(); 1710 jobject jclass_loader = manager->GetClassLoader(); 1711 const DexFile& dex_file = *manager->GetDexFile(); 1712 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1713 const DexFile::TypeId& class_type_id = dex_file.GetTypeId(class_def.class_idx_); 1714 const char* descriptor = dex_file.StringDataByIdx(class_type_id.descriptor_idx_); 1715 1716 ScopedObjectAccess soa(Thread::Current()); 1717 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 1718 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1719 SirtRef<mirror::Class> klass(soa.Self(), 1720 manager->GetClassLinker()->FindClass(soa.Self(), descriptor, 1721 class_loader)); 1722 1723 if (klass.get() != nullptr && !SkipClass(jclass_loader, dex_file, klass.get())) { 1724 // Only try to initialize classes that were successfully verified. 1725 if (klass->IsVerified()) { 1726 // Attempt to initialize the class but bail if we either need to initialize the super-class 1727 // or static fields. 1728 manager->GetClassLinker()->EnsureInitialized(klass, false, false); 1729 if (!klass->IsInitialized()) { 1730 // We don't want non-trivial class initialization occurring on multiple threads due to 1731 // deadlock problems. For example, a parent class is initialized (holding its lock) that 1732 // refers to a sub-class in its static/class initializer causing it to try to acquire the 1733 // sub-class' lock. While on a second thread the sub-class is initialized (holding its lock) 1734 // after first initializing its parents, whose locks are acquired. This leads to a 1735 // parent-to-child and a child-to-parent lock ordering and consequent potential deadlock. 1736 // We need to use an ObjectLock due to potential suspension in the interpreting code. Rather 1737 // than use a special Object for the purpose we use the Class of java.lang.Class. 1738 SirtRef<mirror::Class> sirt_klass(soa.Self(), klass->GetClass()); 1739 ObjectLock<mirror::Class> lock(soa.Self(), &sirt_klass); 1740 // Attempt to initialize allowing initialization of parent classes but still not static 1741 // fields. 1742 manager->GetClassLinker()->EnsureInitialized(klass, false, true); 1743 if (!klass->IsInitialized()) { 1744 // We need to initialize static fields, we only do this for image classes that aren't 1745 // marked with the $NoPreloadHolder (which implies this should not be initialized early). 1746 bool can_init_static_fields = manager->GetCompiler()->IsImage() && 1747 manager->GetCompiler()->IsImageClass(descriptor) && 1748 !StringPiece(descriptor).ends_with("$NoPreloadHolder;"); 1749 if (can_init_static_fields) { 1750 VLOG(compiler) << "Initializing: " << descriptor; 1751 if (strcmp("Ljava/lang/Void;", descriptor) == 0) { 1752 // Hand initialize j.l.Void to avoid Dex file operations in un-started runtime. 1753 ObjectLock<mirror::Class> lock(soa.Self(), &klass); 1754 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetSFields(); 1755 CHECK_EQ(fields->GetLength(), 1); 1756 fields->Get(0)->SetObj<false>(klass.get(), 1757 manager->GetClassLinker()->FindPrimitiveClass('V')); 1758 klass->SetStatus(mirror::Class::kStatusInitialized, soa.Self()); 1759 } else { 1760 // TODO multithreading support. We should ensure the current compilation thread has 1761 // exclusive access to the runtime and the transaction. To achieve this, we could use 1762 // a ReaderWriterMutex but we're holding the mutator lock so we fail mutex sanity 1763 // checks in Thread::AssertThreadSuspensionIsAllowable. 1764 Runtime* const runtime = Runtime::Current(); 1765 Transaction transaction; 1766 1767 // Run the class initializer in transaction mode. 1768 runtime->EnterTransactionMode(&transaction); 1769 const mirror::Class::Status old_status = klass->GetStatus(); 1770 bool success = manager->GetClassLinker()->EnsureInitialized(klass, true, true); 1771 // TODO we detach transaction from runtime to indicate we quit the transactional 1772 // mode which prevents the GC from visiting objects modified during the transaction. 1773 // Ensure GC is not run so don't access freed objects when aborting transaction. 1774 const char* old_casue = soa.Self()->StartAssertNoThreadSuspension("Transaction end"); 1775 runtime->ExitTransactionMode(); 1776 1777 if (!success) { 1778 CHECK(soa.Self()->IsExceptionPending()); 1779 ThrowLocation throw_location; 1780 mirror::Throwable* exception = soa.Self()->GetException(&throw_location); 1781 VLOG(compiler) << "Initialization of " << descriptor << " aborted because of " 1782 << exception->Dump(); 1783 soa.Self()->ClearException(); 1784 transaction.Abort(); 1785 CHECK_EQ(old_status, klass->GetStatus()) << "Previous class status not restored"; 1786 } 1787 soa.Self()->EndAssertNoThreadSuspension(old_casue); 1788 } 1789 } 1790 } 1791 soa.Self()->AssertNoPendingException(); 1792 } 1793 } 1794 // Record the final class status if necessary. 1795 ClassReference ref(manager->GetDexFile(), class_def_index); 1796 manager->GetCompiler()->RecordClassStatus(ref, klass->GetStatus()); 1797 } 1798 // Clear any class not found or verification exceptions. 1799 soa.Self()->ClearException(); 1800} 1801 1802void CompilerDriver::InitializeClasses(jobject jni_class_loader, const DexFile& dex_file, 1803 ThreadPool& thread_pool, TimingLogger& timings) { 1804 timings.NewSplit("InitializeNoClinit"); 1805 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1806 ParallelCompilationManager context(class_linker, jni_class_loader, this, &dex_file, thread_pool); 1807 size_t thread_count; 1808 if (IsImage()) { 1809 // TODO: remove this when transactional mode supports multithreading. 1810 thread_count = 1U; 1811 } else { 1812 thread_count = thread_count_; 1813 } 1814 context.ForAll(0, dex_file.NumClassDefs(), InitializeClass, thread_count); 1815 if (IsImage()) { 1816 // Prune garbage objects created during aborted transactions. 1817 Runtime::Current()->GetHeap()->CollectGarbage(true); 1818 } 1819} 1820 1821void CompilerDriver::InitializeClasses(jobject class_loader, 1822 const std::vector<const DexFile*>& dex_files, 1823 ThreadPool& thread_pool, TimingLogger& timings) { 1824 for (size_t i = 0; i != dex_files.size(); ++i) { 1825 const DexFile* dex_file = dex_files[i]; 1826 CHECK(dex_file != NULL); 1827 InitializeClasses(class_loader, *dex_file, thread_pool, timings); 1828 } 1829} 1830 1831void CompilerDriver::Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1832 ThreadPool& thread_pool, TimingLogger& timings) { 1833 for (size_t i = 0; i != dex_files.size(); ++i) { 1834 const DexFile* dex_file = dex_files[i]; 1835 CHECK(dex_file != NULL); 1836 CompileDexFile(class_loader, *dex_file, thread_pool, timings); 1837 } 1838} 1839 1840void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, size_t class_def_index) { 1841 ATRACE_CALL(); 1842 jobject jclass_loader = manager->GetClassLoader(); 1843 const DexFile& dex_file = *manager->GetDexFile(); 1844 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1845 ClassLinker* class_linker = manager->GetClassLinker(); 1846 if (SkipClass(class_linker, jclass_loader, dex_file, class_def)) { 1847 return; 1848 } 1849 ClassReference ref(&dex_file, class_def_index); 1850 // Skip compiling classes with generic verifier failures since they will still fail at runtime 1851 if (manager->GetCompiler()->verification_results_->IsClassRejected(ref)) { 1852 return; 1853 } 1854 const byte* class_data = dex_file.GetClassData(class_def); 1855 if (class_data == NULL) { 1856 // empty class, probably a marker interface 1857 return; 1858 } 1859 1860 // Can we run DEX-to-DEX compiler on this class ? 1861 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 1862 { 1863 ScopedObjectAccess soa(Thread::Current()); 1864 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 1865 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1866 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(soa.Self(), class_loader, dex_file, 1867 class_def); 1868 } 1869 ClassDataItemIterator it(dex_file, class_data); 1870 // Skip fields 1871 while (it.HasNextStaticField()) { 1872 it.Next(); 1873 } 1874 while (it.HasNextInstanceField()) { 1875 it.Next(); 1876 } 1877 CompilerDriver* driver = manager->GetCompiler(); 1878 // Compile direct methods 1879 int64_t previous_direct_method_idx = -1; 1880 while (it.HasNextDirectMethod()) { 1881 uint32_t method_idx = it.GetMemberIndex(); 1882 if (method_idx == previous_direct_method_idx) { 1883 // smali can create dex files with two encoded_methods sharing the same method_idx 1884 // http://code.google.com/p/smali/issues/detail?id=119 1885 it.Next(); 1886 continue; 1887 } 1888 previous_direct_method_idx = method_idx; 1889 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1890 it.GetMethodInvokeType(class_def), class_def_index, 1891 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1892 it.Next(); 1893 } 1894 // Compile virtual methods 1895 int64_t previous_virtual_method_idx = -1; 1896 while (it.HasNextVirtualMethod()) { 1897 uint32_t method_idx = it.GetMemberIndex(); 1898 if (method_idx == previous_virtual_method_idx) { 1899 // smali can create dex files with two encoded_methods sharing the same method_idx 1900 // http://code.google.com/p/smali/issues/detail?id=119 1901 it.Next(); 1902 continue; 1903 } 1904 previous_virtual_method_idx = method_idx; 1905 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1906 it.GetMethodInvokeType(class_def), class_def_index, 1907 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1908 it.Next(); 1909 } 1910 DCHECK(!it.HasNext()); 1911} 1912 1913void CompilerDriver::CompileDexFile(jobject class_loader, const DexFile& dex_file, 1914 ThreadPool& thread_pool, TimingLogger& timings) { 1915 timings.NewSplit("Compile Dex File"); 1916 ParallelCompilationManager context(Runtime::Current()->GetClassLinker(), class_loader, this, 1917 &dex_file, thread_pool); 1918 context.ForAll(0, dex_file.NumClassDefs(), CompilerDriver::CompileClass, thread_count_); 1919} 1920 1921void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags, 1922 InvokeType invoke_type, uint16_t class_def_idx, 1923 uint32_t method_idx, jobject class_loader, 1924 const DexFile& dex_file, 1925 DexToDexCompilationLevel dex_to_dex_compilation_level) { 1926 CompiledMethod* compiled_method = NULL; 1927 uint64_t start_ns = NanoTime(); 1928 1929 if ((access_flags & kAccNative) != 0) { 1930 compiled_method = compiler_backend_->JniCompile(*this, access_flags, method_idx, dex_file); 1931 CHECK(compiled_method != NULL); 1932 } else if ((access_flags & kAccAbstract) != 0) { 1933 } else { 1934 MethodReference method_ref(&dex_file, method_idx); 1935 bool compile = VerificationResults::IsCandidateForCompilation(method_ref, access_flags); 1936 1937 if (compile) { 1938 // NOTE: if compiler declines to compile this method, it will return NULL. 1939 compiled_method = compiler_backend_->Compile( 1940 *this, code_item, access_flags, invoke_type, class_def_idx, 1941 method_idx, class_loader, dex_file); 1942 } else if (dex_to_dex_compilation_level != kDontDexToDexCompile) { 1943 // TODO: add a mode to disable DEX-to-DEX compilation ? 1944 (*dex_to_dex_compiler_)(*this, code_item, access_flags, 1945 invoke_type, class_def_idx, 1946 method_idx, class_loader, dex_file, 1947 dex_to_dex_compilation_level); 1948 } 1949 } 1950 uint64_t duration_ns = NanoTime() - start_ns; 1951 if (duration_ns > MsToNs(compiler_backend_->GetMaximumCompilationTimeBeforeWarning())) { 1952 LOG(WARNING) << "Compilation of " << PrettyMethod(method_idx, dex_file) 1953 << " took " << PrettyDuration(duration_ns); 1954 } 1955 1956 Thread* self = Thread::Current(); 1957 if (compiled_method != NULL) { 1958 MethodReference ref(&dex_file, method_idx); 1959 DCHECK(GetCompiledMethod(ref) == NULL) << PrettyMethod(method_idx, dex_file); 1960 { 1961 MutexLock mu(self, compiled_methods_lock_); 1962 compiled_methods_.Put(ref, compiled_method); 1963 } 1964 DCHECK(GetCompiledMethod(ref) != NULL) << PrettyMethod(method_idx, dex_file); 1965 } 1966 1967 if (self->IsExceptionPending()) { 1968 ScopedObjectAccess soa(self); 1969 LOG(FATAL) << "Unexpected exception compiling: " << PrettyMethod(method_idx, dex_file) << "\n" 1970 << self->GetException(NULL)->Dump(); 1971 } 1972} 1973 1974CompiledClass* CompilerDriver::GetCompiledClass(ClassReference ref) const { 1975 MutexLock mu(Thread::Current(), compiled_classes_lock_); 1976 ClassTable::const_iterator it = compiled_classes_.find(ref); 1977 if (it == compiled_classes_.end()) { 1978 return NULL; 1979 } 1980 CHECK(it->second != NULL); 1981 return it->second; 1982} 1983 1984void CompilerDriver::RecordClassStatus(ClassReference ref, mirror::Class::Status status) { 1985 MutexLock mu(Thread::Current(), compiled_classes_lock_); 1986 auto it = compiled_classes_.find(ref); 1987 if (it == compiled_classes_.end() || it->second->GetStatus() != status) { 1988 // An entry doesn't exist or the status is lower than the new status. 1989 if (it != compiled_classes_.end()) { 1990 CHECK_GT(status, it->second->GetStatus()); 1991 delete it->second; 1992 } 1993 switch (status) { 1994 case mirror::Class::kStatusNotReady: 1995 case mirror::Class::kStatusError: 1996 case mirror::Class::kStatusRetryVerificationAtRuntime: 1997 case mirror::Class::kStatusVerified: 1998 case mirror::Class::kStatusInitialized: 1999 break; // Expected states. 2000 default: 2001 LOG(FATAL) << "Unexpected class status for class " 2002 << PrettyDescriptor(ref.first->GetClassDescriptor(ref.first->GetClassDef(ref.second))) 2003 << " of " << status; 2004 } 2005 CompiledClass* compiled_class = new CompiledClass(status); 2006 compiled_classes_.Overwrite(ref, compiled_class); 2007 } 2008} 2009 2010CompiledMethod* CompilerDriver::GetCompiledMethod(MethodReference ref) const { 2011 MutexLock mu(Thread::Current(), compiled_methods_lock_); 2012 MethodTable::const_iterator it = compiled_methods_.find(ref); 2013 if (it == compiled_methods_.end()) { 2014 return NULL; 2015 } 2016 CHECK(it->second != NULL); 2017 return it->second; 2018} 2019 2020void CompilerDriver::AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2021 uint16_t class_def_index) { 2022 WriterMutexLock mu(self, freezing_constructor_lock_); 2023 freezing_constructor_classes_.insert(ClassReference(dex_file, class_def_index)); 2024} 2025 2026bool CompilerDriver::RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2027 uint16_t class_def_index) { 2028 ReaderMutexLock mu(self, freezing_constructor_lock_); 2029 return freezing_constructor_classes_.count(ClassReference(dex_file, class_def_index)) != 0; 2030} 2031 2032bool CompilerDriver::WriteElf(const std::string& android_root, 2033 bool is_host, 2034 const std::vector<const art::DexFile*>& dex_files, 2035 OatWriter& oat_writer, 2036 art::File* file) 2037 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2038 return compiler_backend_->WriteElf(file, oat_writer, dex_files, android_root, is_host, *this); 2039} 2040void CompilerDriver::InstructionSetToLLVMTarget(InstructionSet instruction_set, 2041 std::string& target_triple, 2042 std::string& target_cpu, 2043 std::string& target_attr) { 2044 switch (instruction_set) { 2045 case kThumb2: 2046 target_triple = "thumb-none-linux-gnueabi"; 2047 target_cpu = "cortex-a9"; 2048 target_attr = "+thumb2,+neon,+neonfp,+vfp3,+db"; 2049 break; 2050 2051 case kArm: 2052 target_triple = "armv7-none-linux-gnueabi"; 2053 // TODO: Fix for Nexus S. 2054 target_cpu = "cortex-a9"; 2055 // TODO: Fix for Xoom. 2056 target_attr = "+v7,+neon,+neonfp,+vfp3,+db"; 2057 break; 2058 2059 case kX86: 2060 target_triple = "i386-pc-linux-gnu"; 2061 target_attr = ""; 2062 break; 2063 2064 case kMips: 2065 target_triple = "mipsel-unknown-linux"; 2066 target_attr = "mips32r2"; 2067 break; 2068 2069 default: 2070 LOG(FATAL) << "Unknown instruction set: " << instruction_set; 2071 } 2072 } 2073} // namespace art 2074