compiler_driver.cc revision dd7624d2b9e599d57762d12031b10b89defc9807
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#include <fstream> 25 26#include "base/stl_util.h" 27#include "base/timing_logger.h" 28#include "class_linker.h" 29#include "compiler.h" 30#include "compiler_driver-inl.h" 31#include "dex_compilation_unit.h" 32#include "dex_file-inl.h" 33#include "dex/verification_results.h" 34#include "dex/verified_method.h" 35#include "dex/quick/dex_file_method_inliner.h" 36#include "driver/compiler_options.h" 37#include "jni_internal.h" 38#include "object_utils.h" 39#include "runtime.h" 40#include "gc/accounting/card_table-inl.h" 41#include "gc/accounting/heap_bitmap.h" 42#include "gc/space/space.h" 43#include "mirror/art_field-inl.h" 44#include "mirror/art_method-inl.h" 45#include "mirror/class_loader.h" 46#include "mirror/class-inl.h" 47#include "mirror/dex_cache-inl.h" 48#include "mirror/object-inl.h" 49#include "mirror/object_array-inl.h" 50#include "mirror/throwable.h" 51#include "scoped_thread_state_change.h" 52#include "ScopedLocalRef.h" 53#include "sirt_ref-inl.h" 54#include "thread.h" 55#include "thread_pool.h" 56#include "trampolines/trampoline_compiler.h" 57#include "transaction.h" 58#include "verifier/method_verifier.h" 59#include "verifier/method_verifier-inl.h" 60 61namespace art { 62 63static double Percentage(size_t x, size_t y) { 64 return 100.0 * (static_cast<double>(x)) / (static_cast<double>(x + y)); 65} 66 67static void DumpStat(size_t x, size_t y, const char* str) { 68 if (x == 0 && y == 0) { 69 return; 70 } 71 LOG(INFO) << Percentage(x, y) << "% of " << str << " for " << (x + y) << " cases"; 72} 73 74class CompilerDriver::AOTCompilationStats { 75 public: 76 AOTCompilationStats() 77 : stats_lock_("AOT compilation statistics lock"), 78 types_in_dex_cache_(0), types_not_in_dex_cache_(0), 79 strings_in_dex_cache_(0), strings_not_in_dex_cache_(0), 80 resolved_types_(0), unresolved_types_(0), 81 resolved_instance_fields_(0), unresolved_instance_fields_(0), 82 resolved_local_static_fields_(0), resolved_static_fields_(0), unresolved_static_fields_(0), 83 type_based_devirtualization_(0), 84 safe_casts_(0), not_safe_casts_(0) { 85 for (size_t i = 0; i <= kMaxInvokeType; i++) { 86 resolved_methods_[i] = 0; 87 unresolved_methods_[i] = 0; 88 virtual_made_direct_[i] = 0; 89 direct_calls_to_boot_[i] = 0; 90 direct_methods_to_boot_[i] = 0; 91 } 92 } 93 94 void Dump() { 95 DumpStat(types_in_dex_cache_, types_not_in_dex_cache_, "types known to be in dex cache"); 96 DumpStat(strings_in_dex_cache_, strings_not_in_dex_cache_, "strings known to be in dex cache"); 97 DumpStat(resolved_types_, unresolved_types_, "types resolved"); 98 DumpStat(resolved_instance_fields_, unresolved_instance_fields_, "instance fields resolved"); 99 DumpStat(resolved_local_static_fields_ + resolved_static_fields_, unresolved_static_fields_, 100 "static fields resolved"); 101 DumpStat(resolved_local_static_fields_, resolved_static_fields_ + unresolved_static_fields_, 102 "static fields local to a class"); 103 DumpStat(safe_casts_, not_safe_casts_, "check-casts removed based on type information"); 104 // Note, the code below subtracts the stat value so that when added to the stat value we have 105 // 100% of samples. TODO: clean this up. 106 DumpStat(type_based_devirtualization_, 107 resolved_methods_[kVirtual] + unresolved_methods_[kVirtual] + 108 resolved_methods_[kInterface] + unresolved_methods_[kInterface] - 109 type_based_devirtualization_, 110 "virtual/interface calls made direct based on type information"); 111 112 for (size_t i = 0; i <= kMaxInvokeType; i++) { 113 std::ostringstream oss; 114 oss << static_cast<InvokeType>(i) << " methods were AOT resolved"; 115 DumpStat(resolved_methods_[i], unresolved_methods_[i], oss.str().c_str()); 116 if (virtual_made_direct_[i] > 0) { 117 std::ostringstream oss2; 118 oss2 << static_cast<InvokeType>(i) << " methods made direct"; 119 DumpStat(virtual_made_direct_[i], 120 resolved_methods_[i] + unresolved_methods_[i] - virtual_made_direct_[i], 121 oss2.str().c_str()); 122 } 123 if (direct_calls_to_boot_[i] > 0) { 124 std::ostringstream oss2; 125 oss2 << static_cast<InvokeType>(i) << " method calls are direct into boot"; 126 DumpStat(direct_calls_to_boot_[i], 127 resolved_methods_[i] + unresolved_methods_[i] - direct_calls_to_boot_[i], 128 oss2.str().c_str()); 129 } 130 if (direct_methods_to_boot_[i] > 0) { 131 std::ostringstream oss2; 132 oss2 << static_cast<InvokeType>(i) << " method calls have methods in boot"; 133 DumpStat(direct_methods_to_boot_[i], 134 resolved_methods_[i] + unresolved_methods_[i] - direct_methods_to_boot_[i], 135 oss2.str().c_str()); 136 } 137 } 138 } 139 140// Allow lossy statistics in non-debug builds. 141#ifndef NDEBUG 142#define STATS_LOCK() MutexLock mu(Thread::Current(), stats_lock_) 143#else 144#define STATS_LOCK() 145#endif 146 147 void TypeInDexCache() { 148 STATS_LOCK(); 149 types_in_dex_cache_++; 150 } 151 152 void TypeNotInDexCache() { 153 STATS_LOCK(); 154 types_not_in_dex_cache_++; 155 } 156 157 void StringInDexCache() { 158 STATS_LOCK(); 159 strings_in_dex_cache_++; 160 } 161 162 void StringNotInDexCache() { 163 STATS_LOCK(); 164 strings_not_in_dex_cache_++; 165 } 166 167 void TypeDoesntNeedAccessCheck() { 168 STATS_LOCK(); 169 resolved_types_++; 170 } 171 172 void TypeNeedsAccessCheck() { 173 STATS_LOCK(); 174 unresolved_types_++; 175 } 176 177 void ResolvedInstanceField() { 178 STATS_LOCK(); 179 resolved_instance_fields_++; 180 } 181 182 void UnresolvedInstanceField() { 183 STATS_LOCK(); 184 unresolved_instance_fields_++; 185 } 186 187 void ResolvedLocalStaticField() { 188 STATS_LOCK(); 189 resolved_local_static_fields_++; 190 } 191 192 void ResolvedStaticField() { 193 STATS_LOCK(); 194 resolved_static_fields_++; 195 } 196 197 void UnresolvedStaticField() { 198 STATS_LOCK(); 199 unresolved_static_fields_++; 200 } 201 202 // Indicate that type information from the verifier led to devirtualization. 203 void PreciseTypeDevirtualization() { 204 STATS_LOCK(); 205 type_based_devirtualization_++; 206 } 207 208 // Indicate that a method of the given type was resolved at compile time. 209 void ResolvedMethod(InvokeType type) { 210 DCHECK_LE(type, kMaxInvokeType); 211 STATS_LOCK(); 212 resolved_methods_[type]++; 213 } 214 215 // Indicate that a method of the given type was unresolved at compile time as it was in an 216 // unknown dex file. 217 void UnresolvedMethod(InvokeType type) { 218 DCHECK_LE(type, kMaxInvokeType); 219 STATS_LOCK(); 220 unresolved_methods_[type]++; 221 } 222 223 // Indicate that a type of virtual method dispatch has been converted into a direct method 224 // dispatch. 225 void VirtualMadeDirect(InvokeType type) { 226 DCHECK(type == kVirtual || type == kInterface || type == kSuper); 227 STATS_LOCK(); 228 virtual_made_direct_[type]++; 229 } 230 231 // Indicate that a method of the given type was able to call directly into boot. 232 void DirectCallsToBoot(InvokeType type) { 233 DCHECK_LE(type, kMaxInvokeType); 234 STATS_LOCK(); 235 direct_calls_to_boot_[type]++; 236 } 237 238 // Indicate that a method of the given type was able to be resolved directly from boot. 239 void DirectMethodsToBoot(InvokeType type) { 240 DCHECK_LE(type, kMaxInvokeType); 241 STATS_LOCK(); 242 direct_methods_to_boot_[type]++; 243 } 244 245 void ProcessedInvoke(InvokeType type, int flags) { 246 STATS_LOCK(); 247 if (flags == 0) { 248 unresolved_methods_[type]++; 249 } else { 250 DCHECK_NE((flags & kFlagMethodResolved), 0); 251 resolved_methods_[type]++; 252 if ((flags & kFlagVirtualMadeDirect) != 0) { 253 virtual_made_direct_[type]++; 254 if ((flags & kFlagPreciseTypeDevirtualization) != 0) { 255 type_based_devirtualization_++; 256 } 257 } else { 258 DCHECK_EQ((flags & kFlagPreciseTypeDevirtualization), 0); 259 } 260 if ((flags & kFlagDirectCallToBoot) != 0) { 261 direct_calls_to_boot_[type]++; 262 } 263 if ((flags & kFlagDirectMethodToBoot) != 0) { 264 direct_methods_to_boot_[type]++; 265 } 266 } 267 } 268 269 // A check-cast could be eliminated due to verifier type analysis. 270 void SafeCast() { 271 STATS_LOCK(); 272 safe_casts_++; 273 } 274 275 // A check-cast couldn't be eliminated due to verifier type analysis. 276 void NotASafeCast() { 277 STATS_LOCK(); 278 not_safe_casts_++; 279 } 280 281 private: 282 Mutex stats_lock_; 283 284 size_t types_in_dex_cache_; 285 size_t types_not_in_dex_cache_; 286 287 size_t strings_in_dex_cache_; 288 size_t strings_not_in_dex_cache_; 289 290 size_t resolved_types_; 291 size_t unresolved_types_; 292 293 size_t resolved_instance_fields_; 294 size_t unresolved_instance_fields_; 295 296 size_t resolved_local_static_fields_; 297 size_t resolved_static_fields_; 298 size_t unresolved_static_fields_; 299 // Type based devirtualization for invoke interface and virtual. 300 size_t type_based_devirtualization_; 301 302 size_t resolved_methods_[kMaxInvokeType + 1]; 303 size_t unresolved_methods_[kMaxInvokeType + 1]; 304 size_t virtual_made_direct_[kMaxInvokeType + 1]; 305 size_t direct_calls_to_boot_[kMaxInvokeType + 1]; 306 size_t direct_methods_to_boot_[kMaxInvokeType + 1]; 307 308 size_t safe_casts_; 309 size_t not_safe_casts_; 310 311 DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats); 312}; 313 314 315extern "C" art::CompiledMethod* ArtCompileDEX(art::CompilerDriver& compiler, 316 const art::DexFile::CodeItem* code_item, 317 uint32_t access_flags, 318 art::InvokeType invoke_type, 319 uint16_t class_def_idx, 320 uint32_t method_idx, 321 jobject class_loader, 322 const art::DexFile& dex_file); 323 324CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options, 325 VerificationResults* verification_results, 326 DexFileToMethodInlinerMap* method_inliner_map, 327 Compiler::Kind compiler_kind, 328 InstructionSet instruction_set, 329 InstructionSetFeatures instruction_set_features, 330 bool image, DescriptorSet* image_classes, size_t thread_count, 331 bool dump_stats, bool dump_passes, CumulativeLogger* timer, 332 std::string profile_file) 333 : profile_ok_(false), compiler_options_(compiler_options), 334 verification_results_(verification_results), 335 method_inliner_map_(method_inliner_map), 336 compiler_(Compiler::Create(compiler_kind)), 337 instruction_set_(instruction_set), 338 instruction_set_features_(instruction_set_features), 339 instruction_set_is_64_bit_(instruction_set == kX86_64 || instruction_set == kArm64), 340 freezing_constructor_lock_("freezing constructor lock"), 341 compiled_classes_lock_("compiled classes lock"), 342 compiled_methods_lock_("compiled method lock"), 343 image_(image), 344 image_classes_(image_classes), 345 thread_count_(thread_count), 346 start_ns_(0), 347 stats_(new AOTCompilationStats), 348 dump_stats_(dump_stats), 349 dump_passes_(dump_passes), 350 timings_logger_(timer), 351 compiler_library_(NULL), 352 compiler_context_(NULL), 353 compiler_enable_auto_elf_loading_(NULL), 354 compiler_get_method_code_addr_(NULL), 355 support_boot_image_fixup_(instruction_set != kMips), 356 cfi_info_(nullptr), 357 dedupe_code_("dedupe code"), 358 dedupe_mapping_table_("dedupe mapping table"), 359 dedupe_vmap_table_("dedupe vmap table"), 360 dedupe_gc_map_("dedupe gc map"), 361 dedupe_cfi_info_("dedupe cfi info") { 362 DCHECK(compiler_options_ != nullptr); 363 DCHECK(verification_results_ != nullptr); 364 DCHECK(method_inliner_map_ != nullptr); 365 366 CHECK_PTHREAD_CALL(pthread_key_create, (&tls_key_, NULL), "compiler tls key"); 367 368 // Read the profile file if one is provided. 369 if (profile_file != "") { 370 profile_ok_ = ReadProfile(profile_file); 371 } 372 373 dex_to_dex_compiler_ = reinterpret_cast<DexToDexCompilerFn>(ArtCompileDEX); 374 375 compiler_->Init(*this); 376 377 CHECK(!Runtime::Current()->IsStarted()); 378 if (!image_) { 379 CHECK(image_classes_.get() == NULL); 380 } 381 382 // Are we generating CFI information? 383 if (compiler_options->GetGenerateGDBInformation()) { 384 cfi_info_.reset(compiler_->GetCallFrameInformationInitialization(*this)); 385 } 386} 387 388std::vector<uint8_t>* CompilerDriver::DeduplicateCode(const std::vector<uint8_t>& code) { 389 return dedupe_code_.Add(Thread::Current(), code); 390} 391 392std::vector<uint8_t>* CompilerDriver::DeduplicateMappingTable(const std::vector<uint8_t>& code) { 393 return dedupe_mapping_table_.Add(Thread::Current(), code); 394} 395 396std::vector<uint8_t>* CompilerDriver::DeduplicateVMapTable(const std::vector<uint8_t>& code) { 397 return dedupe_vmap_table_.Add(Thread::Current(), code); 398} 399 400std::vector<uint8_t>* CompilerDriver::DeduplicateGCMap(const std::vector<uint8_t>& code) { 401 return dedupe_gc_map_.Add(Thread::Current(), code); 402} 403 404std::vector<uint8_t>* CompilerDriver::DeduplicateCFIInfo(const std::vector<uint8_t>* cfi_info) { 405 if (cfi_info == nullptr) { 406 return nullptr; 407 } 408 return dedupe_cfi_info_.Add(Thread::Current(), *cfi_info); 409} 410 411CompilerDriver::~CompilerDriver() { 412 Thread* self = Thread::Current(); 413 { 414 MutexLock mu(self, compiled_classes_lock_); 415 STLDeleteValues(&compiled_classes_); 416 } 417 { 418 MutexLock mu(self, compiled_methods_lock_); 419 STLDeleteValues(&compiled_methods_); 420 } 421 { 422 MutexLock mu(self, compiled_methods_lock_); 423 STLDeleteElements(&code_to_patch_); 424 } 425 { 426 MutexLock mu(self, compiled_methods_lock_); 427 STLDeleteElements(&methods_to_patch_); 428 } 429 { 430 MutexLock mu(self, compiled_methods_lock_); 431 STLDeleteElements(&classes_to_patch_); 432 } 433 CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key"); 434 compiler_->UnInit(*this); 435} 436 437CompilerTls* CompilerDriver::GetTls() { 438 // Lazily create thread-local storage 439 CompilerTls* res = static_cast<CompilerTls*>(pthread_getspecific(tls_key_)); 440 if (res == NULL) { 441 res = new CompilerTls(); 442 CHECK_PTHREAD_CALL(pthread_setspecific, (tls_key_, res), "compiler tls"); 443 } 444 return res; 445} 446 447#define CREATE_TRAMPOLINE(type, abi, offset) \ 448 if (instruction_set_is_64_bit_) { \ 449 return CreateTrampoline64(instruction_set_, abi, \ 450 type ## _ENTRYPOINT_OFFSET(8, offset)); \ 451 } else { \ 452 return CreateTrampoline32(instruction_set_, abi, \ 453 type ## _ENTRYPOINT_OFFSET(4, offset)); \ 454 } 455 456const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToInterpreterBridge() const { 457 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToInterpreterBridge) 458} 459 460const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToCompiledCodeBridge() const { 461 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToCompiledCodeBridge) 462} 463 464const std::vector<uint8_t>* CompilerDriver::CreateJniDlsymLookup() const { 465 CREATE_TRAMPOLINE(JNI, kJniAbi, pDlsymLookup) 466} 467 468const std::vector<uint8_t>* CompilerDriver::CreatePortableImtConflictTrampoline() const { 469 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableImtConflictTrampoline) 470} 471 472const std::vector<uint8_t>* CompilerDriver::CreatePortableResolutionTrampoline() const { 473 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableResolutionTrampoline) 474} 475 476const std::vector<uint8_t>* CompilerDriver::CreatePortableToInterpreterBridge() const { 477 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableToInterpreterBridge) 478} 479 480const std::vector<uint8_t>* CompilerDriver::CreateQuickGenericJniTrampoline() const { 481 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickGenericJniTrampoline) 482} 483 484const std::vector<uint8_t>* CompilerDriver::CreateQuickImtConflictTrampoline() const { 485 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickImtConflictTrampoline) 486} 487 488const std::vector<uint8_t>* CompilerDriver::CreateQuickResolutionTrampoline() const { 489 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickResolutionTrampoline) 490} 491 492const std::vector<uint8_t>* CompilerDriver::CreateQuickToInterpreterBridge() const { 493 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickToInterpreterBridge) 494} 495#undef CREATE_TRAMPOLINE 496 497void CompilerDriver::CompileAll(jobject class_loader, 498 const std::vector<const DexFile*>& dex_files, 499 TimingLogger* timings) { 500 DCHECK(!Runtime::Current()->IsStarted()); 501 UniquePtr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", thread_count_ - 1)); 502 PreCompile(class_loader, dex_files, thread_pool.get(), timings); 503 Compile(class_loader, dex_files, thread_pool.get(), timings); 504 if (dump_stats_) { 505 stats_->Dump(); 506 } 507} 508 509static DexToDexCompilationLevel GetDexToDexCompilationlevel( 510 Thread* self, SirtRef<mirror::ClassLoader>& class_loader, const DexFile& dex_file, 511 const DexFile::ClassDef& class_def) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 512 const char* descriptor = dex_file.GetClassDescriptor(class_def); 513 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 514 mirror::Class* klass = class_linker->FindClass(self, descriptor, class_loader); 515 if (klass == NULL) { 516 CHECK(self->IsExceptionPending()); 517 self->ClearException(); 518 return kDontDexToDexCompile; 519 } 520 // The verifier can only run on "quick" instructions at runtime (see usage of 521 // FindAccessedFieldAtDexPc and FindInvokedMethodAtDexPc in ThrowNullPointerExceptionFromDexPC 522 // function). Since image classes can be verified again while compiling an application, 523 // we must prevent the DEX-to-DEX compiler from introducing them. 524 // TODO: find a way to enable "quick" instructions for image classes and remove this check. 525 bool compiling_image_classes = class_loader.get() == nullptr; 526 if (compiling_image_classes) { 527 return kRequired; 528 } else if (klass->IsVerified()) { 529 // Class is verified so we can enable DEX-to-DEX compilation for performance. 530 return kOptimize; 531 } else if (klass->IsCompileTimeVerified()) { 532 // Class verification has soft-failed. Anyway, ensure at least correctness. 533 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 534 return kRequired; 535 } else { 536 // Class verification has failed: do not run DEX-to-DEX compilation. 537 return kDontDexToDexCompile; 538 } 539} 540 541void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings) { 542 DCHECK(!Runtime::Current()->IsStarted()); 543 Thread* self = Thread::Current(); 544 jobject jclass_loader; 545 const DexFile* dex_file; 546 uint16_t class_def_idx; 547 uint32_t method_idx = method->GetDexMethodIndex(); 548 uint32_t access_flags = method->GetAccessFlags(); 549 InvokeType invoke_type = method->GetInvokeType(); 550 { 551 ScopedObjectAccessUnchecked soa(self); 552 ScopedLocalRef<jobject> 553 local_class_loader(soa.Env(), 554 soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader())); 555 jclass_loader = soa.Env()->NewGlobalRef(local_class_loader.get()); 556 // Find the dex_file 557 MethodHelper mh(method); 558 dex_file = &mh.GetDexFile(); 559 class_def_idx = mh.GetClassDefIndex(); 560 } 561 const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset()); 562 self->TransitionFromRunnableToSuspended(kNative); 563 564 std::vector<const DexFile*> dex_files; 565 dex_files.push_back(dex_file); 566 567 UniquePtr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", 0U)); 568 PreCompile(jclass_loader, dex_files, thread_pool.get(), timings); 569 570 // Can we run DEX-to-DEX compiler on this class ? 571 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 572 { 573 ScopedObjectAccess soa(Thread::Current()); 574 const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx); 575 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 576 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 577 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(self, class_loader, *dex_file, 578 class_def); 579 } 580 CompileMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx, jclass_loader, 581 *dex_file, dex_to_dex_compilation_level); 582 583 self->GetJniEnv()->DeleteGlobalRef(jclass_loader); 584 585 self->TransitionFromSuspendedToRunnable(); 586} 587 588void CompilerDriver::Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files, 589 ThreadPool* thread_pool, TimingLogger* timings) { 590 for (size_t i = 0; i != dex_files.size(); ++i) { 591 const DexFile* dex_file = dex_files[i]; 592 CHECK(dex_file != NULL); 593 ResolveDexFile(class_loader, *dex_file, thread_pool, timings); 594 } 595} 596 597void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 598 ThreadPool* thread_pool, TimingLogger* timings) { 599 LoadImageClasses(timings); 600 601 Resolve(class_loader, dex_files, thread_pool, timings); 602 603 Verify(class_loader, dex_files, thread_pool, timings); 604 605 InitializeClasses(class_loader, dex_files, thread_pool, timings); 606 607 UpdateImageClasses(timings); 608} 609 610bool CompilerDriver::IsImageClass(const char* descriptor) const { 611 if (!IsImage()) { 612 return true; 613 } else { 614 return image_classes_->find(descriptor) != image_classes_->end(); 615 } 616} 617 618static void ResolveExceptionsForMethod(MethodHelper* mh, 619 std::set<std::pair<uint16_t, const DexFile*> >& exceptions_to_resolve) 620 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 621 const DexFile::CodeItem* code_item = mh->GetCodeItem(); 622 if (code_item == NULL) { 623 return; // native or abstract method 624 } 625 if (code_item->tries_size_ == 0) { 626 return; // nothing to process 627 } 628 const byte* encoded_catch_handler_list = DexFile::GetCatchHandlerData(*code_item, 0); 629 size_t num_encoded_catch_handlers = DecodeUnsignedLeb128(&encoded_catch_handler_list); 630 for (size_t i = 0; i < num_encoded_catch_handlers; i++) { 631 int32_t encoded_catch_handler_size = DecodeSignedLeb128(&encoded_catch_handler_list); 632 bool has_catch_all = false; 633 if (encoded_catch_handler_size <= 0) { 634 encoded_catch_handler_size = -encoded_catch_handler_size; 635 has_catch_all = true; 636 } 637 for (int32_t j = 0; j < encoded_catch_handler_size; j++) { 638 uint16_t encoded_catch_handler_handlers_type_idx = 639 DecodeUnsignedLeb128(&encoded_catch_handler_list); 640 // Add to set of types to resolve if not already in the dex cache resolved types 641 if (!mh->IsResolvedTypeIdx(encoded_catch_handler_handlers_type_idx)) { 642 exceptions_to_resolve.insert( 643 std::pair<uint16_t, const DexFile*>(encoded_catch_handler_handlers_type_idx, 644 &mh->GetDexFile())); 645 } 646 // ignore address associated with catch handler 647 DecodeUnsignedLeb128(&encoded_catch_handler_list); 648 } 649 if (has_catch_all) { 650 // ignore catch all address 651 DecodeUnsignedLeb128(&encoded_catch_handler_list); 652 } 653 } 654} 655 656static bool ResolveCatchBlockExceptionsClassVisitor(mirror::Class* c, void* arg) 657 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 658 std::set<std::pair<uint16_t, const DexFile*> >* exceptions_to_resolve = 659 reinterpret_cast<std::set<std::pair<uint16_t, const DexFile*> >*>(arg); 660 MethodHelper mh; 661 for (size_t i = 0; i < c->NumVirtualMethods(); ++i) { 662 mirror::ArtMethod* m = c->GetVirtualMethod(i); 663 mh.ChangeMethod(m); 664 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 665 } 666 for (size_t i = 0; i < c->NumDirectMethods(); ++i) { 667 mirror::ArtMethod* m = c->GetDirectMethod(i); 668 mh.ChangeMethod(m); 669 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 670 } 671 return true; 672} 673 674static bool RecordImageClassesVisitor(mirror::Class* klass, void* arg) 675 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 676 CompilerDriver::DescriptorSet* image_classes = 677 reinterpret_cast<CompilerDriver::DescriptorSet*>(arg); 678 image_classes->insert(ClassHelper(klass).GetDescriptor()); 679 return true; 680} 681 682// Make a list of descriptors for classes to include in the image 683void CompilerDriver::LoadImageClasses(TimingLogger* timings) 684 LOCKS_EXCLUDED(Locks::mutator_lock_) { 685 if (!IsImage()) { 686 return; 687 } 688 689 timings->NewSplit("LoadImageClasses"); 690 // Make a first class to load all classes explicitly listed in the file 691 Thread* self = Thread::Current(); 692 ScopedObjectAccess soa(self); 693 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 694 for (auto it = image_classes_->begin(), end = image_classes_->end(); it != end;) { 695 const std::string& descriptor(*it); 696 SirtRef<mirror::Class> klass(self, class_linker->FindSystemClass(self, descriptor.c_str())); 697 if (klass.get() == NULL) { 698 VLOG(compiler) << "Failed to find class " << descriptor; 699 image_classes_->erase(it++); 700 self->ClearException(); 701 } else { 702 ++it; 703 } 704 } 705 706 // Resolve exception classes referenced by the loaded classes. The catch logic assumes 707 // exceptions are resolved by the verifier when there is a catch block in an interested method. 708 // Do this here so that exception classes appear to have been specified image classes. 709 std::set<std::pair<uint16_t, const DexFile*> > unresolved_exception_types; 710 SirtRef<mirror::Class> java_lang_Throwable(self, 711 class_linker->FindSystemClass(self, "Ljava/lang/Throwable;")); 712 do { 713 unresolved_exception_types.clear(); 714 class_linker->VisitClasses(ResolveCatchBlockExceptionsClassVisitor, 715 &unresolved_exception_types); 716 for (const std::pair<uint16_t, const DexFile*>& exception_type : unresolved_exception_types) { 717 uint16_t exception_type_idx = exception_type.first; 718 const DexFile* dex_file = exception_type.second; 719 SirtRef<mirror::DexCache> dex_cache(self, class_linker->FindDexCache(*dex_file)); 720 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 721 SirtRef<mirror::Class> klass(self, class_linker->ResolveType(*dex_file, exception_type_idx, 722 dex_cache, class_loader)); 723 if (klass.get() == NULL) { 724 const DexFile::TypeId& type_id = dex_file->GetTypeId(exception_type_idx); 725 const char* descriptor = dex_file->GetTypeDescriptor(type_id); 726 LOG(FATAL) << "Failed to resolve class " << descriptor; 727 } 728 DCHECK(java_lang_Throwable->IsAssignableFrom(klass.get())); 729 } 730 // Resolving exceptions may load classes that reference more exceptions, iterate until no 731 // more are found 732 } while (!unresolved_exception_types.empty()); 733 734 // We walk the roots looking for classes so that we'll pick up the 735 // above classes plus any classes them depend on such super 736 // classes, interfaces, and the required ClassLinker roots. 737 class_linker->VisitClasses(RecordImageClassesVisitor, image_classes_.get()); 738 739 CHECK_NE(image_classes_->size(), 0U); 740} 741 742static void MaybeAddToImageClasses(mirror::Class* klass, CompilerDriver::DescriptorSet* image_classes) 743 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 744 while (!klass->IsObjectClass()) { 745 ClassHelper kh(klass); 746 const char* descriptor = kh.GetDescriptor(); 747 std::pair<CompilerDriver::DescriptorSet::iterator, bool> result = 748 image_classes->insert(descriptor); 749 if (result.second) { 750 VLOG(compiler) << "Adding " << descriptor << " to image classes"; 751 } else { 752 return; 753 } 754 for (size_t i = 0; i < kh.NumDirectInterfaces(); ++i) { 755 MaybeAddToImageClasses(kh.GetDirectInterface(i), image_classes); 756 } 757 if (klass->IsArrayClass()) { 758 MaybeAddToImageClasses(klass->GetComponentType(), image_classes); 759 } 760 klass = klass->GetSuperClass(); 761 } 762} 763 764void CompilerDriver::FindClinitImageClassesCallback(mirror::Object* object, void* arg) { 765 DCHECK(object != NULL); 766 DCHECK(arg != NULL); 767 CompilerDriver* compiler_driver = reinterpret_cast<CompilerDriver*>(arg); 768 MaybeAddToImageClasses(object->GetClass(), compiler_driver->image_classes_.get()); 769} 770 771void CompilerDriver::UpdateImageClasses(TimingLogger* timings) { 772 if (IsImage()) { 773 timings->NewSplit("UpdateImageClasses"); 774 775 // Update image_classes_ with classes for objects created by <clinit> methods. 776 Thread* self = Thread::Current(); 777 const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); 778 gc::Heap* heap = Runtime::Current()->GetHeap(); 779 // TODO: Image spaces only? 780 ScopedObjectAccess soa(Thread::Current()); 781 WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 782 heap->VisitObjects(FindClinitImageClassesCallback, this); 783 self->EndAssertNoThreadSuspension(old_cause); 784 } 785} 786 787bool CompilerDriver::CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx) { 788 if (IsImage() && 789 IsImageClass(dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_))) { 790 if (kIsDebugBuild) { 791 ScopedObjectAccess soa(Thread::Current()); 792 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 793 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 794 CHECK(resolved_class != NULL); 795 } 796 stats_->TypeInDexCache(); 797 return true; 798 } else { 799 stats_->TypeNotInDexCache(); 800 return false; 801 } 802} 803 804bool CompilerDriver::CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, 805 uint32_t string_idx) { 806 // See also Compiler::ResolveDexFile 807 808 bool result = false; 809 if (IsImage()) { 810 // We resolve all const-string strings when building for the image. 811 ScopedObjectAccess soa(Thread::Current()); 812 SirtRef<mirror::DexCache> dex_cache(soa.Self(), Runtime::Current()->GetClassLinker()->FindDexCache(dex_file)); 813 Runtime::Current()->GetClassLinker()->ResolveString(dex_file, string_idx, dex_cache); 814 result = true; 815 } 816 if (result) { 817 stats_->StringInDexCache(); 818 } else { 819 stats_->StringNotInDexCache(); 820 } 821 return result; 822} 823 824bool CompilerDriver::CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file, 825 uint32_t type_idx, 826 bool* type_known_final, bool* type_known_abstract, 827 bool* equals_referrers_class) { 828 if (type_known_final != NULL) { 829 *type_known_final = false; 830 } 831 if (type_known_abstract != NULL) { 832 *type_known_abstract = false; 833 } 834 if (equals_referrers_class != NULL) { 835 *equals_referrers_class = false; 836 } 837 ScopedObjectAccess soa(Thread::Current()); 838 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 839 // Get type from dex cache assuming it was populated by the verifier 840 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 841 if (resolved_class == NULL) { 842 stats_->TypeNeedsAccessCheck(); 843 return false; // Unknown class needs access checks. 844 } 845 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 846 if (equals_referrers_class != NULL) { 847 *equals_referrers_class = (method_id.class_idx_ == type_idx); 848 } 849 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 850 if (referrer_class == NULL) { 851 stats_->TypeNeedsAccessCheck(); 852 return false; // Incomplete referrer knowledge needs access check. 853 } 854 // Perform access check, will return true if access is ok or false if we're going to have to 855 // check this at runtime (for example for class loaders). 856 bool result = referrer_class->CanAccess(resolved_class); 857 if (result) { 858 stats_->TypeDoesntNeedAccessCheck(); 859 if (type_known_final != NULL) { 860 *type_known_final = resolved_class->IsFinal() && !resolved_class->IsArrayClass(); 861 } 862 if (type_known_abstract != NULL) { 863 *type_known_abstract = resolved_class->IsAbstract() && !resolved_class->IsArrayClass(); 864 } 865 } else { 866 stats_->TypeNeedsAccessCheck(); 867 } 868 return result; 869} 870 871bool CompilerDriver::CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, 872 const DexFile& dex_file, 873 uint32_t type_idx) { 874 ScopedObjectAccess soa(Thread::Current()); 875 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 876 // Get type from dex cache assuming it was populated by the verifier. 877 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 878 if (resolved_class == NULL) { 879 stats_->TypeNeedsAccessCheck(); 880 return false; // Unknown class needs access checks. 881 } 882 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 883 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 884 if (referrer_class == NULL) { 885 stats_->TypeNeedsAccessCheck(); 886 return false; // Incomplete referrer knowledge needs access check. 887 } 888 // Perform access and instantiable checks, will return true if access is ok or false if we're 889 // going to have to check this at runtime (for example for class loaders). 890 bool result = referrer_class->CanAccess(resolved_class) && resolved_class->IsInstantiable(); 891 if (result) { 892 stats_->TypeDoesntNeedAccessCheck(); 893 } else { 894 stats_->TypeNeedsAccessCheck(); 895 } 896 return result; 897} 898 899bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx, 900 bool* is_type_initialized, bool* use_direct_type_ptr, 901 uintptr_t* direct_type_ptr) { 902 ScopedObjectAccess soa(Thread::Current()); 903 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 904 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 905 if (resolved_class == nullptr) { 906 return false; 907 } 908 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 909 if (compiling_boot) { 910 // boot -> boot class pointers. 911 // True if the class is in the image at boot compiling time. 912 const bool is_image_class = IsImage() && IsImageClass( 913 dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_)); 914 // True if pc relative load works. 915 const bool support_boot_image_fixup = GetSupportBootImageFixup(); 916 if (is_image_class && support_boot_image_fixup) { 917 *is_type_initialized = resolved_class->IsInitialized(); 918 *use_direct_type_ptr = false; 919 *direct_type_ptr = 0; 920 return true; 921 } else { 922 return false; 923 } 924 } else { 925 // True if the class is in the image at app compiling time. 926 const bool class_in_image = 927 Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace(); 928 if (class_in_image) { 929 // boot -> app class pointers. 930 *is_type_initialized = resolved_class->IsInitialized(); 931 *use_direct_type_ptr = true; 932 *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class); 933 return true; 934 } else { 935 // app -> app class pointers. 936 // Give up because app does not have an image and class 937 // isn't created at compile time. TODO: implement this 938 // if/when each app gets an image. 939 return false; 940 } 941 } 942} 943 944void CompilerDriver::ProcessedInstanceField(bool resolved) { 945 if (!resolved) { 946 stats_->UnresolvedInstanceField(); 947 } else { 948 stats_->ResolvedInstanceField(); 949 } 950} 951 952void CompilerDriver::ProcessedStaticField(bool resolved, bool local) { 953 if (!resolved) { 954 stats_->UnresolvedStaticField(); 955 } else if (local) { 956 stats_->ResolvedLocalStaticField(); 957 } else { 958 stats_->ResolvedStaticField(); 959 } 960} 961 962void CompilerDriver::ProcessedInvoke(InvokeType invoke_type, int flags) { 963 stats_->ProcessedInvoke(invoke_type, flags); 964} 965 966bool CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 967 bool is_put, MemberOffset* field_offset, 968 bool* is_volatile) { 969 ScopedObjectAccess soa(Thread::Current()); 970 // Try to resolve the field and compiling method's class. 971 mirror::ArtField* resolved_field; 972 mirror::Class* referrer_class; 973 mirror::DexCache* dex_cache; 974 { 975 SirtRef<mirror::DexCache> dex_cache_sirt(soa.Self(), 976 mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 977 SirtRef<mirror::ClassLoader> class_loader_sirt(soa.Self(), 978 soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 979 SirtRef<mirror::ArtField> resolved_field_sirt(soa.Self(), 980 ResolveField(soa, dex_cache_sirt, class_loader_sirt, mUnit, field_idx, false)); 981 referrer_class = (resolved_field_sirt.get() != nullptr) 982 ? ResolveCompilingMethodsClass(soa, dex_cache_sirt, class_loader_sirt, mUnit) : nullptr; 983 resolved_field = resolved_field_sirt.get(); 984 dex_cache = dex_cache_sirt.get(); 985 } 986 bool result = false; 987 if (resolved_field != nullptr && referrer_class != nullptr) { 988 *is_volatile = IsFieldVolatile(resolved_field); 989 std::pair<bool, bool> fast_path = IsFastInstanceField( 990 dex_cache, referrer_class, resolved_field, field_idx, field_offset); 991 result = is_put ? fast_path.second : fast_path.first; 992 } 993 if (!result) { 994 // Conservative defaults. 995 *is_volatile = true; 996 *field_offset = MemberOffset(static_cast<size_t>(-1)); 997 } 998 ProcessedInstanceField(result); 999 return result; 1000} 1001 1002bool CompilerDriver::ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 1003 bool is_put, MemberOffset* field_offset, 1004 uint32_t* storage_index, bool* is_referrers_class, 1005 bool* is_volatile, bool* is_initialized) { 1006 ScopedObjectAccess soa(Thread::Current()); 1007 // Try to resolve the field and compiling method's class. 1008 mirror::ArtField* resolved_field; 1009 mirror::Class* referrer_class; 1010 mirror::DexCache* dex_cache; 1011 { 1012 SirtRef<mirror::DexCache> dex_cache_sirt(soa.Self(), 1013 mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 1014 SirtRef<mirror::ClassLoader> class_loader_sirt(soa.Self(), 1015 soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 1016 SirtRef<mirror::ArtField> resolved_field_sirt(soa.Self(), 1017 ResolveField(soa, dex_cache_sirt, class_loader_sirt, mUnit, field_idx, true)); 1018 referrer_class = (resolved_field_sirt.get() != nullptr) 1019 ? ResolveCompilingMethodsClass(soa, dex_cache_sirt, class_loader_sirt, mUnit) : nullptr; 1020 resolved_field = resolved_field_sirt.get(); 1021 dex_cache = dex_cache_sirt.get(); 1022 } 1023 bool result = false; 1024 if (resolved_field != nullptr && referrer_class != nullptr) { 1025 *is_volatile = IsFieldVolatile(resolved_field); 1026 std::pair<bool, bool> fast_path = IsFastStaticField( 1027 dex_cache, referrer_class, resolved_field, field_idx, field_offset, 1028 storage_index, is_referrers_class, is_initialized); 1029 result = is_put ? fast_path.second : fast_path.first; 1030 } 1031 if (!result) { 1032 // Conservative defaults. 1033 *is_volatile = true; 1034 *field_offset = MemberOffset(static_cast<size_t>(-1)); 1035 *storage_index = -1; 1036 *is_referrers_class = false; 1037 *is_initialized = false; 1038 } 1039 ProcessedStaticField(result, *is_referrers_class); 1040 return result; 1041} 1042 1043void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type, 1044 bool no_guarantee_of_dex_cache_entry, 1045 mirror::Class* referrer_class, 1046 mirror::ArtMethod* method, 1047 int* stats_flags, 1048 MethodReference* target_method, 1049 uintptr_t* direct_code, 1050 uintptr_t* direct_method) { 1051 // For direct and static methods compute possible direct_code and direct_method values, ie 1052 // an address for the Method* being invoked and an address of the code for that Method*. 1053 // For interface calls compute a value for direct_method that is the interface method being 1054 // invoked, so this can be passed to the out-of-line runtime support code. 1055 *direct_code = 0; 1056 *direct_method = 0; 1057 bool use_dex_cache = false; 1058 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 1059 if (compiler_->IsPortable()) { 1060 if (sharp_type != kStatic && sharp_type != kDirect) { 1061 return; 1062 } 1063 use_dex_cache = true; 1064 } else { 1065 if (sharp_type != kStatic && sharp_type != kDirect) { 1066 return; 1067 } 1068 // TODO: support patching on all architectures. 1069 use_dex_cache = compiling_boot && !support_boot_image_fixup_; 1070 } 1071 bool method_code_in_boot = (method->GetDeclaringClass()->GetClassLoader() == nullptr); 1072 if (!use_dex_cache) { 1073 if (!method_code_in_boot) { 1074 use_dex_cache = true; 1075 } else { 1076 bool has_clinit_trampoline = 1077 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 1078 if (has_clinit_trampoline && (method->GetDeclaringClass() != referrer_class)) { 1079 // Ensure we run the clinit trampoline unless we are invoking a static method in the same 1080 // class. 1081 use_dex_cache = true; 1082 } 1083 } 1084 } 1085 if (method_code_in_boot) { 1086 *stats_flags |= kFlagDirectCallToBoot | kFlagDirectMethodToBoot; 1087 } 1088 if (!use_dex_cache && compiling_boot) { 1089 MethodHelper mh(method); 1090 if (!IsImageClass(mh.GetDeclaringClassDescriptor())) { 1091 // We can only branch directly to Methods that are resolved in the DexCache. 1092 // Otherwise we won't invoke the resolution trampoline. 1093 use_dex_cache = true; 1094 } 1095 } 1096 // The method is defined not within this dex file. We need a dex cache slot within the current 1097 // dex file or direct pointers. 1098 bool must_use_direct_pointers = false; 1099 if (target_method->dex_file == method->GetDeclaringClass()->GetDexCache()->GetDexFile()) { 1100 target_method->dex_method_index = method->GetDexMethodIndex(); 1101 } else { 1102 if (no_guarantee_of_dex_cache_entry) { 1103 // See if the method is also declared in this dex cache. 1104 uint32_t dex_method_idx = MethodHelper(method).FindDexMethodIndexInOtherDexFile( 1105 *target_method->dex_file, target_method->dex_method_index); 1106 if (dex_method_idx != DexFile::kDexNoIndex) { 1107 target_method->dex_method_index = dex_method_idx; 1108 } else { 1109 if (compiling_boot) { 1110 target_method->dex_method_index = method->GetDexMethodIndex(); 1111 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1112 } 1113 must_use_direct_pointers = true; 1114 } 1115 } 1116 } 1117 if (use_dex_cache) { 1118 if (must_use_direct_pointers) { 1119 // Fail. Test above showed the only safe dispatch was via the dex cache, however, the direct 1120 // pointers are required as the dex cache lacks an appropriate entry. 1121 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1122 } else { 1123 *type = sharp_type; 1124 } 1125 } else { 1126 if (compiling_boot) { 1127 *type = sharp_type; 1128 *direct_method = -1; 1129 *direct_code = -1; 1130 } else { 1131 bool method_in_image = 1132 Runtime::Current()->GetHeap()->FindSpaceFromObject(method, false)->IsImageSpace(); 1133 if (method_in_image) { 1134 CHECK(!method->IsAbstract()); 1135 *type = sharp_type; 1136 *direct_method = reinterpret_cast<uintptr_t>(method); 1137 *direct_code = compiler_->GetEntryPointOf(method); 1138 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1139 target_method->dex_method_index = method->GetDexMethodIndex(); 1140 } else if (!must_use_direct_pointers) { 1141 // Set the code and rely on the dex cache for the method. 1142 *type = sharp_type; 1143 *direct_code = compiler_->GetEntryPointOf(method); 1144 } else { 1145 // Direct pointers were required but none were available. 1146 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1147 } 1148 } 1149 } 1150} 1151 1152bool CompilerDriver::ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc, 1153 bool update_stats, bool enable_devirtualization, 1154 InvokeType* invoke_type, MethodReference* target_method, 1155 int* vtable_idx, uintptr_t* direct_code, 1156 uintptr_t* direct_method) { 1157 InvokeType orig_invoke_type = *invoke_type; 1158 int stats_flags = 0; 1159 ScopedObjectAccess soa(Thread::Current()); 1160 // Try to resolve the method and compiling method's class. 1161 mirror::ArtMethod* resolved_method; 1162 mirror::Class* referrer_class; 1163 SirtRef<mirror::DexCache> dex_cache(soa.Self(), 1164 mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); 1165 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 1166 soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); 1167 { 1168 uint32_t method_idx = target_method->dex_method_index; 1169 SirtRef<mirror::ArtMethod> resolved_method_sirt(soa.Self(), 1170 ResolveMethod(soa, dex_cache, class_loader, mUnit, method_idx, orig_invoke_type)); 1171 referrer_class = (resolved_method_sirt.get() != nullptr) 1172 ? ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit) : nullptr; 1173 resolved_method = resolved_method_sirt.get(); 1174 } 1175 bool result = false; 1176 if (resolved_method != nullptr) { 1177 *vtable_idx = GetResolvedMethodVTableIndex(resolved_method, orig_invoke_type); 1178 1179 if (enable_devirtualization) { 1180 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1181 const MethodReference* devirt_target = mUnit->GetVerifiedMethod()->GetDevirtTarget(dex_pc); 1182 1183 stats_flags = IsFastInvoke( 1184 soa, dex_cache, class_loader, mUnit, referrer_class, resolved_method, 1185 invoke_type, target_method, devirt_target, direct_code, direct_method); 1186 result = stats_flags != 0; 1187 } else { 1188 // Devirtualization not enabled. Inline IsFastInvoke(), dropping the devirtualization parts. 1189 if (UNLIKELY(referrer_class == nullptr) || 1190 UNLIKELY(!referrer_class->CanAccessResolvedMethod(resolved_method->GetDeclaringClass(), 1191 resolved_method, dex_cache.get(), 1192 target_method->dex_method_index)) || 1193 *invoke_type == kSuper) { 1194 // Slow path. (Without devirtualization, all super calls go slow path as well.) 1195 } else { 1196 // Sharpening failed so generate a regular resolved method dispatch. 1197 stats_flags = kFlagMethodResolved; 1198 GetCodeAndMethodForDirectCall(invoke_type, *invoke_type, false, referrer_class, resolved_method, 1199 &stats_flags, target_method, direct_code, direct_method); 1200 result = true; 1201 } 1202 } 1203 } 1204 if (!result) { 1205 // Conservative defaults. 1206 *vtable_idx = -1; 1207 *direct_code = 0u; 1208 *direct_method = 0u; 1209 } 1210 if (update_stats) { 1211 ProcessedInvoke(orig_invoke_type, stats_flags); 1212 } 1213 return result; 1214} 1215 1216const VerifiedMethod* CompilerDriver::GetVerifiedMethod(const DexFile* dex_file, 1217 uint32_t method_idx) const { 1218 MethodReference ref(dex_file, method_idx); 1219 return verification_results_->GetVerifiedMethod(ref); 1220} 1221 1222bool CompilerDriver::IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc) { 1223 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1224 bool result = mUnit->GetVerifiedMethod()->IsSafeCast(dex_pc); 1225 if (result) { 1226 stats_->SafeCast(); 1227 } else { 1228 stats_->NotASafeCast(); 1229 } 1230 return result; 1231} 1232 1233void CompilerDriver::AddCodePatch(const DexFile* dex_file, 1234 uint16_t referrer_class_def_idx, 1235 uint32_t referrer_method_idx, 1236 InvokeType referrer_invoke_type, 1237 uint32_t target_method_idx, 1238 const DexFile* target_dex_file, 1239 InvokeType target_invoke_type, 1240 size_t literal_offset) { 1241 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1242 code_to_patch_.push_back(new CallPatchInformation(dex_file, 1243 referrer_class_def_idx, 1244 referrer_method_idx, 1245 referrer_invoke_type, 1246 target_method_idx, 1247 target_dex_file, 1248 target_invoke_type, 1249 literal_offset)); 1250} 1251void CompilerDriver::AddRelativeCodePatch(const DexFile* dex_file, 1252 uint16_t referrer_class_def_idx, 1253 uint32_t referrer_method_idx, 1254 InvokeType referrer_invoke_type, 1255 uint32_t target_method_idx, 1256 const DexFile* target_dex_file, 1257 InvokeType target_invoke_type, 1258 size_t literal_offset, 1259 int32_t pc_relative_offset) { 1260 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1261 code_to_patch_.push_back(new RelativeCallPatchInformation(dex_file, 1262 referrer_class_def_idx, 1263 referrer_method_idx, 1264 referrer_invoke_type, 1265 target_method_idx, 1266 target_dex_file, 1267 target_invoke_type, 1268 literal_offset, 1269 pc_relative_offset)); 1270} 1271void CompilerDriver::AddMethodPatch(const DexFile* dex_file, 1272 uint16_t referrer_class_def_idx, 1273 uint32_t referrer_method_idx, 1274 InvokeType referrer_invoke_type, 1275 uint32_t target_method_idx, 1276 const DexFile* target_dex_file, 1277 InvokeType target_invoke_type, 1278 size_t literal_offset) { 1279 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1280 methods_to_patch_.push_back(new CallPatchInformation(dex_file, 1281 referrer_class_def_idx, 1282 referrer_method_idx, 1283 referrer_invoke_type, 1284 target_method_idx, 1285 target_dex_file, 1286 target_invoke_type, 1287 literal_offset)); 1288} 1289void CompilerDriver::AddClassPatch(const DexFile* dex_file, 1290 uint16_t referrer_class_def_idx, 1291 uint32_t referrer_method_idx, 1292 uint32_t target_type_idx, 1293 size_t literal_offset) { 1294 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1295 classes_to_patch_.push_back(new TypePatchInformation(dex_file, 1296 referrer_class_def_idx, 1297 referrer_method_idx, 1298 target_type_idx, 1299 literal_offset)); 1300} 1301 1302class ParallelCompilationManager { 1303 public: 1304 typedef void Callback(const ParallelCompilationManager* manager, size_t index); 1305 1306 ParallelCompilationManager(ClassLinker* class_linker, 1307 jobject class_loader, 1308 CompilerDriver* compiler, 1309 const DexFile* dex_file, 1310 ThreadPool* thread_pool) 1311 : index_(0), 1312 class_linker_(class_linker), 1313 class_loader_(class_loader), 1314 compiler_(compiler), 1315 dex_file_(dex_file), 1316 thread_pool_(thread_pool) {} 1317 1318 ClassLinker* GetClassLinker() const { 1319 CHECK(class_linker_ != NULL); 1320 return class_linker_; 1321 } 1322 1323 jobject GetClassLoader() const { 1324 return class_loader_; 1325 } 1326 1327 CompilerDriver* GetCompiler() const { 1328 CHECK(compiler_ != NULL); 1329 return compiler_; 1330 } 1331 1332 const DexFile* GetDexFile() const { 1333 CHECK(dex_file_ != NULL); 1334 return dex_file_; 1335 } 1336 1337 void ForAll(size_t begin, size_t end, Callback callback, size_t work_units) { 1338 Thread* self = Thread::Current(); 1339 self->AssertNoPendingException(); 1340 CHECK_GT(work_units, 0U); 1341 1342 index_ = begin; 1343 for (size_t i = 0; i < work_units; ++i) { 1344 thread_pool_->AddTask(self, new ForAllClosure(this, end, callback)); 1345 } 1346 thread_pool_->StartWorkers(self); 1347 1348 // Ensure we're suspended while we're blocked waiting for the other threads to finish (worker 1349 // thread destructor's called below perform join). 1350 CHECK_NE(self->GetState(), kRunnable); 1351 1352 // Wait for all the worker threads to finish. 1353 thread_pool_->Wait(self, true, false); 1354 } 1355 1356 size_t NextIndex() { 1357 return index_.FetchAndAdd(1); 1358 } 1359 1360 private: 1361 class ForAllClosure : public Task { 1362 public: 1363 ForAllClosure(ParallelCompilationManager* manager, size_t end, Callback* callback) 1364 : manager_(manager), 1365 end_(end), 1366 callback_(callback) {} 1367 1368 virtual void Run(Thread* self) { 1369 while (true) { 1370 const size_t index = manager_->NextIndex(); 1371 if (UNLIKELY(index >= end_)) { 1372 break; 1373 } 1374 callback_(manager_, index); 1375 self->AssertNoPendingException(); 1376 } 1377 } 1378 1379 virtual void Finalize() { 1380 delete this; 1381 } 1382 1383 private: 1384 ParallelCompilationManager* const manager_; 1385 const size_t end_; 1386 Callback* const callback_; 1387 }; 1388 1389 AtomicInteger index_; 1390 ClassLinker* const class_linker_; 1391 const jobject class_loader_; 1392 CompilerDriver* const compiler_; 1393 const DexFile* const dex_file_; 1394 ThreadPool* const thread_pool_; 1395 1396 DISALLOW_COPY_AND_ASSIGN(ParallelCompilationManager); 1397}; 1398 1399// Return true if the class should be skipped during compilation. 1400// 1401// The first case where we skip is for redundant class definitions in 1402// the boot classpath. We skip all but the first definition in that case. 1403// 1404// The second case where we skip is when an app bundles classes found 1405// in the boot classpath. Since at runtime we will select the class from 1406// the boot classpath, we ignore the one from the app. 1407static bool SkipClass(ClassLinker* class_linker, jobject class_loader, const DexFile& dex_file, 1408 const DexFile::ClassDef& class_def) { 1409 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1410 if (class_loader == NULL) { 1411 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, class_linker->GetBootClassPath()); 1412 CHECK(pair.second != NULL); 1413 if (pair.first != &dex_file) { 1414 LOG(WARNING) << "Skipping class " << descriptor << " from " << dex_file.GetLocation() 1415 << " previously found in " << pair.first->GetLocation(); 1416 return true; 1417 } 1418 return false; 1419 } 1420 return class_linker->IsInBootClassPath(descriptor); 1421} 1422 1423// A fast version of SkipClass above if the class pointer is available 1424// that avoids the expensive FindInClassPath search. 1425static bool SkipClass(jobject class_loader, const DexFile& dex_file, mirror::Class* klass) 1426 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1427 DCHECK(klass != NULL); 1428 const DexFile& original_dex_file = *klass->GetDexCache()->GetDexFile(); 1429 if (&dex_file != &original_dex_file) { 1430 if (class_loader == NULL) { 1431 LOG(WARNING) << "Skipping class " << PrettyDescriptor(klass) << " from " 1432 << dex_file.GetLocation() << " previously found in " 1433 << original_dex_file.GetLocation(); 1434 } 1435 return true; 1436 } 1437 return false; 1438} 1439 1440static void ResolveClassFieldsAndMethods(const ParallelCompilationManager* manager, 1441 size_t class_def_index) 1442 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1443 ATRACE_CALL(); 1444 Thread* self = Thread::Current(); 1445 jobject jclass_loader = manager->GetClassLoader(); 1446 const DexFile& dex_file = *manager->GetDexFile(); 1447 ClassLinker* class_linker = manager->GetClassLinker(); 1448 1449 // If an instance field is final then we need to have a barrier on the return, static final 1450 // fields are assigned within the lock held for class initialization. Conservatively assume 1451 // constructor barriers are always required. 1452 bool requires_constructor_barrier = true; 1453 1454 // Method and Field are the worst. We can't resolve without either 1455 // context from the code use (to disambiguate virtual vs direct 1456 // method and instance vs static field) or from class 1457 // definitions. While the compiler will resolve what it can as it 1458 // needs it, here we try to resolve fields and methods used in class 1459 // definitions, since many of them many never be referenced by 1460 // generated code. 1461 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1462 if (!SkipClass(class_linker, jclass_loader, dex_file, class_def)) { 1463 ScopedObjectAccess soa(self); 1464 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1465 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1466 // Resolve the class. 1467 mirror::Class* klass = class_linker->ResolveType(dex_file, class_def.class_idx_, dex_cache, 1468 class_loader); 1469 bool resolve_fields_and_methods; 1470 if (klass == NULL) { 1471 // Class couldn't be resolved, for example, super-class is in a different dex file. Don't 1472 // attempt to resolve methods and fields when there is no declaring class. 1473 CHECK(soa.Self()->IsExceptionPending()); 1474 soa.Self()->ClearException(); 1475 resolve_fields_and_methods = false; 1476 } else { 1477 resolve_fields_and_methods = manager->GetCompiler()->IsImage(); 1478 } 1479 // Note the class_data pointer advances through the headers, 1480 // static fields, instance fields, direct methods, and virtual 1481 // methods. 1482 const byte* class_data = dex_file.GetClassData(class_def); 1483 if (class_data == NULL) { 1484 // Empty class such as a marker interface. 1485 requires_constructor_barrier = false; 1486 } else { 1487 ClassDataItemIterator it(dex_file, class_data); 1488 while (it.HasNextStaticField()) { 1489 if (resolve_fields_and_methods) { 1490 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1491 dex_cache, class_loader, true); 1492 if (field == NULL) { 1493 CHECK(soa.Self()->IsExceptionPending()); 1494 soa.Self()->ClearException(); 1495 } 1496 } 1497 it.Next(); 1498 } 1499 // We require a constructor barrier if there are final instance fields. 1500 requires_constructor_barrier = false; 1501 while (it.HasNextInstanceField()) { 1502 if ((it.GetMemberAccessFlags() & kAccFinal) != 0) { 1503 requires_constructor_barrier = true; 1504 } 1505 if (resolve_fields_and_methods) { 1506 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1507 dex_cache, class_loader, false); 1508 if (field == NULL) { 1509 CHECK(soa.Self()->IsExceptionPending()); 1510 soa.Self()->ClearException(); 1511 } 1512 } 1513 it.Next(); 1514 } 1515 if (resolve_fields_and_methods) { 1516 while (it.HasNextDirectMethod()) { 1517 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1518 dex_cache, class_loader, NULL, 1519 it.GetMethodInvokeType(class_def)); 1520 if (method == NULL) { 1521 CHECK(soa.Self()->IsExceptionPending()); 1522 soa.Self()->ClearException(); 1523 } 1524 it.Next(); 1525 } 1526 while (it.HasNextVirtualMethod()) { 1527 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1528 dex_cache, class_loader, NULL, 1529 it.GetMethodInvokeType(class_def)); 1530 if (method == NULL) { 1531 CHECK(soa.Self()->IsExceptionPending()); 1532 soa.Self()->ClearException(); 1533 } 1534 it.Next(); 1535 } 1536 DCHECK(!it.HasNext()); 1537 } 1538 } 1539 } 1540 if (requires_constructor_barrier) { 1541 manager->GetCompiler()->AddRequiresConstructorBarrier(self, &dex_file, class_def_index); 1542 } 1543} 1544 1545static void ResolveType(const ParallelCompilationManager* manager, size_t type_idx) 1546 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1547 // Class derived values are more complicated, they require the linker and loader. 1548 ScopedObjectAccess soa(Thread::Current()); 1549 ClassLinker* class_linker = manager->GetClassLinker(); 1550 const DexFile& dex_file = *manager->GetDexFile(); 1551 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1552 SirtRef<mirror::ClassLoader> class_loader( 1553 soa.Self(), soa.Decode<mirror::ClassLoader*>(manager->GetClassLoader())); 1554 mirror::Class* klass = class_linker->ResolveType(dex_file, type_idx, dex_cache, class_loader); 1555 1556 if (klass == NULL) { 1557 CHECK(soa.Self()->IsExceptionPending()); 1558 mirror::Throwable* exception = soa.Self()->GetException(NULL); 1559 VLOG(compiler) << "Exception during type resolution: " << exception->Dump(); 1560 if (strcmp("Ljava/lang/OutOfMemoryError;", 1561 ClassHelper(exception->GetClass()).GetDescriptor()) == 0) { 1562 // There's little point continuing compilation if the heap is exhausted. 1563 LOG(FATAL) << "Out of memory during type resolution for compilation"; 1564 } 1565 soa.Self()->ClearException(); 1566 } 1567} 1568 1569void CompilerDriver::ResolveDexFile(jobject class_loader, const DexFile& dex_file, 1570 ThreadPool* thread_pool, TimingLogger* timings) { 1571 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1572 1573 // TODO: we could resolve strings here, although the string table is largely filled with class 1574 // and method names. 1575 1576 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, thread_pool); 1577 if (IsImage()) { 1578 // For images we resolve all types, such as array, whereas for applications just those with 1579 // classdefs are resolved by ResolveClassFieldsAndMethods. 1580 timings->NewSplit("Resolve Types"); 1581 context.ForAll(0, dex_file.NumTypeIds(), ResolveType, thread_count_); 1582 } 1583 1584 timings->NewSplit("Resolve MethodsAndFields"); 1585 context.ForAll(0, dex_file.NumClassDefs(), ResolveClassFieldsAndMethods, thread_count_); 1586} 1587 1588void CompilerDriver::Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1589 ThreadPool* thread_pool, TimingLogger* timings) { 1590 for (size_t i = 0; i != dex_files.size(); ++i) { 1591 const DexFile* dex_file = dex_files[i]; 1592 CHECK(dex_file != NULL); 1593 VerifyDexFile(class_loader, *dex_file, thread_pool, timings); 1594 } 1595} 1596 1597static void VerifyClass(const ParallelCompilationManager* manager, size_t class_def_index) 1598 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1599 ATRACE_CALL(); 1600 ScopedObjectAccess soa(Thread::Current()); 1601 const DexFile& dex_file = *manager->GetDexFile(); 1602 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1603 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1604 ClassLinker* class_linker = manager->GetClassLinker(); 1605 jobject jclass_loader = manager->GetClassLoader(); 1606 SirtRef<mirror::ClassLoader> class_loader( 1607 soa.Self(), soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1608 SirtRef<mirror::Class> klass(soa.Self(), class_linker->FindClass(soa.Self(), descriptor, 1609 class_loader)); 1610 if (klass.get() == nullptr) { 1611 CHECK(soa.Self()->IsExceptionPending()); 1612 soa.Self()->ClearException(); 1613 1614 /* 1615 * At compile time, we can still structurally verify the class even if FindClass fails. 1616 * This is to ensure the class is structurally sound for compilation. An unsound class 1617 * will be rejected by the verifier and later skipped during compilation in the compiler. 1618 */ 1619 SirtRef<mirror::DexCache> dex_cache(soa.Self(), class_linker->FindDexCache(dex_file)); 1620 std::string error_msg; 1621 if (verifier::MethodVerifier::VerifyClass(&dex_file, dex_cache, class_loader, &class_def, true, 1622 &error_msg) == 1623 verifier::MethodVerifier::kHardFailure) { 1624 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(descriptor) 1625 << " because: " << error_msg; 1626 } 1627 } else if (!SkipClass(jclass_loader, dex_file, klass.get())) { 1628 CHECK(klass->IsResolved()) << PrettyClass(klass.get()); 1629 class_linker->VerifyClass(klass); 1630 1631 if (klass->IsErroneous()) { 1632 // ClassLinker::VerifyClass throws, which isn't useful in the compiler. 1633 CHECK(soa.Self()->IsExceptionPending()); 1634 soa.Self()->ClearException(); 1635 } 1636 1637 CHECK(klass->IsCompileTimeVerified() || klass->IsErroneous()) 1638 << PrettyDescriptor(klass.get()) << ": state=" << klass->GetStatus(); 1639 } 1640 soa.Self()->AssertNoPendingException(); 1641} 1642 1643void CompilerDriver::VerifyDexFile(jobject class_loader, const DexFile& dex_file, 1644 ThreadPool* thread_pool, TimingLogger* timings) { 1645 timings->NewSplit("Verify Dex File"); 1646 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1647 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, thread_pool); 1648 context.ForAll(0, dex_file.NumClassDefs(), VerifyClass, thread_count_); 1649} 1650 1651static void InitializeClass(const ParallelCompilationManager* manager, size_t class_def_index) 1652 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1653 ATRACE_CALL(); 1654 jobject jclass_loader = manager->GetClassLoader(); 1655 const DexFile& dex_file = *manager->GetDexFile(); 1656 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1657 const DexFile::TypeId& class_type_id = dex_file.GetTypeId(class_def.class_idx_); 1658 const char* descriptor = dex_file.StringDataByIdx(class_type_id.descriptor_idx_); 1659 1660 ScopedObjectAccess soa(Thread::Current()); 1661 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 1662 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1663 SirtRef<mirror::Class> klass(soa.Self(), 1664 manager->GetClassLinker()->FindClass(soa.Self(), descriptor, 1665 class_loader)); 1666 1667 if (klass.get() != nullptr && !SkipClass(jclass_loader, dex_file, klass.get())) { 1668 // Only try to initialize classes that were successfully verified. 1669 if (klass->IsVerified()) { 1670 // Attempt to initialize the class but bail if we either need to initialize the super-class 1671 // or static fields. 1672 manager->GetClassLinker()->EnsureInitialized(klass, false, false); 1673 if (!klass->IsInitialized()) { 1674 // We don't want non-trivial class initialization occurring on multiple threads due to 1675 // deadlock problems. For example, a parent class is initialized (holding its lock) that 1676 // refers to a sub-class in its static/class initializer causing it to try to acquire the 1677 // sub-class' lock. While on a second thread the sub-class is initialized (holding its lock) 1678 // after first initializing its parents, whose locks are acquired. This leads to a 1679 // parent-to-child and a child-to-parent lock ordering and consequent potential deadlock. 1680 // We need to use an ObjectLock due to potential suspension in the interpreting code. Rather 1681 // than use a special Object for the purpose we use the Class of java.lang.Class. 1682 SirtRef<mirror::Class> sirt_klass(soa.Self(), klass->GetClass()); 1683 ObjectLock<mirror::Class> lock(soa.Self(), &sirt_klass); 1684 // Attempt to initialize allowing initialization of parent classes but still not static 1685 // fields. 1686 manager->GetClassLinker()->EnsureInitialized(klass, false, true); 1687 if (!klass->IsInitialized()) { 1688 // We need to initialize static fields, we only do this for image classes that aren't 1689 // marked with the $NoPreloadHolder (which implies this should not be initialized early). 1690 bool can_init_static_fields = manager->GetCompiler()->IsImage() && 1691 manager->GetCompiler()->IsImageClass(descriptor) && 1692 !StringPiece(descriptor).ends_with("$NoPreloadHolder;"); 1693 if (can_init_static_fields) { 1694 VLOG(compiler) << "Initializing: " << descriptor; 1695 if (strcmp("Ljava/lang/Void;", descriptor) == 0) { 1696 // Hand initialize j.l.Void to avoid Dex file operations in un-started runtime. 1697 ObjectLock<mirror::Class> lock(soa.Self(), &klass); 1698 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetSFields(); 1699 CHECK_EQ(fields->GetLength(), 1); 1700 fields->Get(0)->SetObj<false>(klass.get(), 1701 manager->GetClassLinker()->FindPrimitiveClass('V')); 1702 klass->SetStatus(mirror::Class::kStatusInitialized, soa.Self()); 1703 } else { 1704 // TODO multithreading support. We should ensure the current compilation thread has 1705 // exclusive access to the runtime and the transaction. To achieve this, we could use 1706 // a ReaderWriterMutex but we're holding the mutator lock so we fail mutex sanity 1707 // checks in Thread::AssertThreadSuspensionIsAllowable. 1708 Runtime* const runtime = Runtime::Current(); 1709 Transaction transaction; 1710 1711 // Run the class initializer in transaction mode. 1712 runtime->EnterTransactionMode(&transaction); 1713 const mirror::Class::Status old_status = klass->GetStatus(); 1714 bool success = manager->GetClassLinker()->EnsureInitialized(klass, true, true); 1715 // TODO we detach transaction from runtime to indicate we quit the transactional 1716 // mode which prevents the GC from visiting objects modified during the transaction. 1717 // Ensure GC is not run so don't access freed objects when aborting transaction. 1718 const char* old_casue = soa.Self()->StartAssertNoThreadSuspension("Transaction end"); 1719 runtime->ExitTransactionMode(); 1720 1721 if (!success) { 1722 CHECK(soa.Self()->IsExceptionPending()); 1723 ThrowLocation throw_location; 1724 mirror::Throwable* exception = soa.Self()->GetException(&throw_location); 1725 VLOG(compiler) << "Initialization of " << descriptor << " aborted because of " 1726 << exception->Dump(); 1727 soa.Self()->ClearException(); 1728 transaction.Abort(); 1729 CHECK_EQ(old_status, klass->GetStatus()) << "Previous class status not restored"; 1730 } 1731 soa.Self()->EndAssertNoThreadSuspension(old_casue); 1732 } 1733 } 1734 } 1735 soa.Self()->AssertNoPendingException(); 1736 } 1737 } 1738 // Record the final class status if necessary. 1739 ClassReference ref(manager->GetDexFile(), class_def_index); 1740 manager->GetCompiler()->RecordClassStatus(ref, klass->GetStatus()); 1741 } 1742 // Clear any class not found or verification exceptions. 1743 soa.Self()->ClearException(); 1744} 1745 1746void CompilerDriver::InitializeClasses(jobject jni_class_loader, const DexFile& dex_file, 1747 ThreadPool* thread_pool, TimingLogger* timings) { 1748 timings->NewSplit("InitializeNoClinit"); 1749 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1750 ParallelCompilationManager context(class_linker, jni_class_loader, this, &dex_file, thread_pool); 1751 size_t thread_count; 1752 if (IsImage()) { 1753 // TODO: remove this when transactional mode supports multithreading. 1754 thread_count = 1U; 1755 } else { 1756 thread_count = thread_count_; 1757 } 1758 context.ForAll(0, dex_file.NumClassDefs(), InitializeClass, thread_count); 1759 if (IsImage()) { 1760 // Prune garbage objects created during aborted transactions. 1761 Runtime::Current()->GetHeap()->CollectGarbage(true); 1762 } 1763} 1764 1765void CompilerDriver::InitializeClasses(jobject class_loader, 1766 const std::vector<const DexFile*>& dex_files, 1767 ThreadPool* thread_pool, TimingLogger* timings) { 1768 for (size_t i = 0; i != dex_files.size(); ++i) { 1769 const DexFile* dex_file = dex_files[i]; 1770 CHECK(dex_file != NULL); 1771 InitializeClasses(class_loader, *dex_file, thread_pool, timings); 1772 } 1773} 1774 1775void CompilerDriver::Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1776 ThreadPool* thread_pool, TimingLogger* timings) { 1777 for (size_t i = 0; i != dex_files.size(); ++i) { 1778 const DexFile* dex_file = dex_files[i]; 1779 CHECK(dex_file != NULL); 1780 CompileDexFile(class_loader, *dex_file, thread_pool, timings); 1781 } 1782} 1783 1784void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, size_t class_def_index) { 1785 ATRACE_CALL(); 1786 jobject jclass_loader = manager->GetClassLoader(); 1787 const DexFile& dex_file = *manager->GetDexFile(); 1788 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1789 ClassLinker* class_linker = manager->GetClassLinker(); 1790 if (SkipClass(class_linker, jclass_loader, dex_file, class_def)) { 1791 return; 1792 } 1793 ClassReference ref(&dex_file, class_def_index); 1794 // Skip compiling classes with generic verifier failures since they will still fail at runtime 1795 if (manager->GetCompiler()->verification_results_->IsClassRejected(ref)) { 1796 return; 1797 } 1798 const byte* class_data = dex_file.GetClassData(class_def); 1799 if (class_data == NULL) { 1800 // empty class, probably a marker interface 1801 return; 1802 } 1803 1804 // Can we run DEX-to-DEX compiler on this class ? 1805 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 1806 { 1807 ScopedObjectAccess soa(Thread::Current()); 1808 SirtRef<mirror::ClassLoader> class_loader(soa.Self(), 1809 soa.Decode<mirror::ClassLoader*>(jclass_loader)); 1810 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(soa.Self(), class_loader, dex_file, 1811 class_def); 1812 } 1813 ClassDataItemIterator it(dex_file, class_data); 1814 // Skip fields 1815 while (it.HasNextStaticField()) { 1816 it.Next(); 1817 } 1818 while (it.HasNextInstanceField()) { 1819 it.Next(); 1820 } 1821 CompilerDriver* driver = manager->GetCompiler(); 1822 // Compile direct methods 1823 int64_t previous_direct_method_idx = -1; 1824 while (it.HasNextDirectMethod()) { 1825 uint32_t method_idx = it.GetMemberIndex(); 1826 if (method_idx == previous_direct_method_idx) { 1827 // smali can create dex files with two encoded_methods sharing the same method_idx 1828 // http://code.google.com/p/smali/issues/detail?id=119 1829 it.Next(); 1830 continue; 1831 } 1832 previous_direct_method_idx = method_idx; 1833 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1834 it.GetMethodInvokeType(class_def), class_def_index, 1835 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1836 it.Next(); 1837 } 1838 // Compile virtual methods 1839 int64_t previous_virtual_method_idx = -1; 1840 while (it.HasNextVirtualMethod()) { 1841 uint32_t method_idx = it.GetMemberIndex(); 1842 if (method_idx == previous_virtual_method_idx) { 1843 // smali can create dex files with two encoded_methods sharing the same method_idx 1844 // http://code.google.com/p/smali/issues/detail?id=119 1845 it.Next(); 1846 continue; 1847 } 1848 previous_virtual_method_idx = method_idx; 1849 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1850 it.GetMethodInvokeType(class_def), class_def_index, 1851 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1852 it.Next(); 1853 } 1854 DCHECK(!it.HasNext()); 1855} 1856 1857void CompilerDriver::CompileDexFile(jobject class_loader, const DexFile& dex_file, 1858 ThreadPool* thread_pool, TimingLogger* timings) { 1859 timings->NewSplit("Compile Dex File"); 1860 ParallelCompilationManager context(Runtime::Current()->GetClassLinker(), class_loader, this, 1861 &dex_file, thread_pool); 1862 context.ForAll(0, dex_file.NumClassDefs(), CompilerDriver::CompileClass, thread_count_); 1863} 1864 1865void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags, 1866 InvokeType invoke_type, uint16_t class_def_idx, 1867 uint32_t method_idx, jobject class_loader, 1868 const DexFile& dex_file, 1869 DexToDexCompilationLevel dex_to_dex_compilation_level) { 1870 CompiledMethod* compiled_method = NULL; 1871 uint64_t start_ns = NanoTime(); 1872 1873 if ((access_flags & kAccNative) != 0) { 1874 // Are we interpreting only and have support for generic JNI down calls? 1875 if ((compiler_options_->GetCompilerFilter() == CompilerOptions::kInterpretOnly) && 1876 (instruction_set_ == kX86_64 || instruction_set_ == kArm64)) { 1877 // Leaving this empty will trigger the generic JNI version 1878 } else { 1879 compiled_method = compiler_->JniCompile(*this, access_flags, method_idx, dex_file); 1880 CHECK(compiled_method != NULL); 1881 } 1882 } else if ((access_flags & kAccAbstract) != 0) { 1883 } else { 1884 MethodReference method_ref(&dex_file, method_idx); 1885 bool compile = verification_results_->IsCandidateForCompilation(method_ref, access_flags); 1886 if (compile) { 1887 // NOTE: if compiler declines to compile this method, it will return NULL. 1888 compiled_method = compiler_->Compile( 1889 *this, code_item, access_flags, invoke_type, class_def_idx, 1890 method_idx, class_loader, dex_file); 1891 } else if (dex_to_dex_compilation_level != kDontDexToDexCompile) { 1892 // TODO: add a mode to disable DEX-to-DEX compilation ? 1893 (*dex_to_dex_compiler_)(*this, code_item, access_flags, 1894 invoke_type, class_def_idx, 1895 method_idx, class_loader, dex_file, 1896 dex_to_dex_compilation_level); 1897 } 1898 } 1899 uint64_t duration_ns = NanoTime() - start_ns; 1900 if (duration_ns > MsToNs(compiler_->GetMaximumCompilationTimeBeforeWarning())) { 1901 LOG(WARNING) << "Compilation of " << PrettyMethod(method_idx, dex_file) 1902 << " took " << PrettyDuration(duration_ns); 1903 } 1904 1905 Thread* self = Thread::Current(); 1906 if (compiled_method != NULL) { 1907 MethodReference ref(&dex_file, method_idx); 1908 DCHECK(GetCompiledMethod(ref) == NULL) << PrettyMethod(method_idx, dex_file); 1909 { 1910 MutexLock mu(self, compiled_methods_lock_); 1911 compiled_methods_.Put(ref, compiled_method); 1912 } 1913 DCHECK(GetCompiledMethod(ref) != NULL) << PrettyMethod(method_idx, dex_file); 1914 } 1915 1916 if (self->IsExceptionPending()) { 1917 ScopedObjectAccess soa(self); 1918 LOG(FATAL) << "Unexpected exception compiling: " << PrettyMethod(method_idx, dex_file) << "\n" 1919 << self->GetException(NULL)->Dump(); 1920 } 1921} 1922 1923CompiledClass* CompilerDriver::GetCompiledClass(ClassReference ref) const { 1924 MutexLock mu(Thread::Current(), compiled_classes_lock_); 1925 ClassTable::const_iterator it = compiled_classes_.find(ref); 1926 if (it == compiled_classes_.end()) { 1927 return NULL; 1928 } 1929 CHECK(it->second != NULL); 1930 return it->second; 1931} 1932 1933void CompilerDriver::RecordClassStatus(ClassReference ref, mirror::Class::Status status) { 1934 MutexLock mu(Thread::Current(), compiled_classes_lock_); 1935 auto it = compiled_classes_.find(ref); 1936 if (it == compiled_classes_.end() || it->second->GetStatus() != status) { 1937 // An entry doesn't exist or the status is lower than the new status. 1938 if (it != compiled_classes_.end()) { 1939 CHECK_GT(status, it->second->GetStatus()); 1940 delete it->second; 1941 } 1942 switch (status) { 1943 case mirror::Class::kStatusNotReady: 1944 case mirror::Class::kStatusError: 1945 case mirror::Class::kStatusRetryVerificationAtRuntime: 1946 case mirror::Class::kStatusVerified: 1947 case mirror::Class::kStatusInitialized: 1948 break; // Expected states. 1949 default: 1950 LOG(FATAL) << "Unexpected class status for class " 1951 << PrettyDescriptor(ref.first->GetClassDescriptor(ref.first->GetClassDef(ref.second))) 1952 << " of " << status; 1953 } 1954 CompiledClass* compiled_class = new CompiledClass(status); 1955 compiled_classes_.Overwrite(ref, compiled_class); 1956 } 1957} 1958 1959CompiledMethod* CompilerDriver::GetCompiledMethod(MethodReference ref) const { 1960 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1961 MethodTable::const_iterator it = compiled_methods_.find(ref); 1962 if (it == compiled_methods_.end()) { 1963 return NULL; 1964 } 1965 CHECK(it->second != NULL); 1966 return it->second; 1967} 1968 1969void CompilerDriver::AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 1970 uint16_t class_def_index) { 1971 WriterMutexLock mu(self, freezing_constructor_lock_); 1972 freezing_constructor_classes_.insert(ClassReference(dex_file, class_def_index)); 1973} 1974 1975bool CompilerDriver::RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 1976 uint16_t class_def_index) { 1977 ReaderMutexLock mu(self, freezing_constructor_lock_); 1978 return freezing_constructor_classes_.count(ClassReference(dex_file, class_def_index)) != 0; 1979} 1980 1981bool CompilerDriver::WriteElf(const std::string& android_root, 1982 bool is_host, 1983 const std::vector<const art::DexFile*>& dex_files, 1984 OatWriter* oat_writer, 1985 art::File* file) 1986 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1987 return compiler_->WriteElf(file, oat_writer, dex_files, android_root, is_host, *this); 1988} 1989void CompilerDriver::InstructionSetToLLVMTarget(InstructionSet instruction_set, 1990 std::string* target_triple, 1991 std::string* target_cpu, 1992 std::string* target_attr) { 1993 switch (instruction_set) { 1994 case kThumb2: 1995 *target_triple = "thumb-none-linux-gnueabi"; 1996 *target_cpu = "cortex-a9"; 1997 *target_attr = "+thumb2,+neon,+neonfp,+vfp3,+db"; 1998 break; 1999 2000 case kArm: 2001 *target_triple = "armv7-none-linux-gnueabi"; 2002 // TODO: Fix for Nexus S. 2003 *target_cpu = "cortex-a9"; 2004 // TODO: Fix for Xoom. 2005 *target_attr = "+v7,+neon,+neonfp,+vfp3,+db"; 2006 break; 2007 2008 case kX86: 2009 *target_triple = "i386-pc-linux-gnu"; 2010 *target_attr = ""; 2011 break; 2012 2013 case kMips: 2014 *target_triple = "mipsel-unknown-linux"; 2015 *target_attr = "mips32r2"; 2016 break; 2017 2018 default: 2019 LOG(FATAL) << "Unknown instruction set: " << instruction_set; 2020 } 2021 } 2022 2023bool CompilerDriver::ReadProfile(const std::string& filename) { 2024 VLOG(compiler) << "reading profile file " << filename; 2025 struct stat st; 2026 int err = stat(filename.c_str(), &st); 2027 if (err == -1) { 2028 VLOG(compiler) << "not found"; 2029 return false; 2030 } 2031 std::ifstream in(filename.c_str()); 2032 if (!in) { 2033 VLOG(compiler) << "profile file " << filename << " exists but can't be opened"; 2034 VLOG(compiler) << "file owner: " << st.st_uid << ":" << st.st_gid; 2035 VLOG(compiler) << "me: " << getuid() << ":" << getgid(); 2036 VLOG(compiler) << "file permissions: " << std::oct << st.st_mode; 2037 VLOG(compiler) << "errno: " << errno; 2038 return false; 2039 } 2040 // The first line contains summary information. 2041 std::string line; 2042 std::getline(in, line); 2043 if (in.eof()) { 2044 return false; 2045 } 2046 std::vector<std::string> summary_info; 2047 Split(line, '/', summary_info); 2048 if (summary_info.size() != 3) { 2049 // Bad summary info. It should be count/total/bootpath 2050 return false; 2051 } 2052 // This is the number of hits in all methods. 2053 uint32_t total_count = 0; 2054 for (int i = 0 ; i < 3; ++i) { 2055 total_count += atoi(summary_info[0].c_str()); 2056 } 2057 2058 // Now read each line until the end of file. Each line consists of 3 fields separated by / 2059 while (!in.eof()) { 2060 std::getline(in, line); 2061 if (in.eof()) { 2062 break; 2063 } 2064 std::vector<std::string> info; 2065 Split(line, '/', info); 2066 if (info.size() != 3) { 2067 // Malformed. 2068 break; 2069 } 2070 const std::string& methodname = info[0]; 2071 uint32_t count = atoi(info[1].c_str()); 2072 uint32_t size = atoi(info[2].c_str()); 2073 double percent = (count * 100.0) / total_count; 2074 // Add it to the profile map 2075 profile_map_[methodname] = ProfileData(methodname, count, size, percent); 2076 } 2077 return true; 2078} 2079 2080bool CompilerDriver::SkipCompilation(const std::string& method_name) { 2081 if (!profile_ok_) { 2082 return true; 2083 } 2084 constexpr double kThresholdPercent = 2.0; // Anything above this threshold will be compiled. 2085 2086 // First find the method in the profile map. 2087 ProfileMap::iterator i = profile_map_.find(method_name); 2088 if (i == profile_map_.end()) { 2089 // Not in profile, no information can be determined. 2090 VLOG(compiler) << "not compiling " << method_name << " because it's not in the profile"; 2091 return true; 2092 } 2093 const ProfileData& data = i->second; 2094 bool compile = data.IsAbove(kThresholdPercent); 2095 if (compile) { 2096 LOG(INFO) << "compiling method " << method_name << " because its usage is " << 2097 data.GetPercent() << "%"; 2098 } else { 2099 VLOG(compiler) << "not compiling method " << method_name << " because usage is too low (" 2100 << data.GetPercent() << "%)"; 2101 } 2102 return !compile; 2103} 2104} // namespace art 2105