compiler_driver.cc revision cb6b0f31ede2275e79e6199ec391147585a37a2a
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 "compiled_class.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_lock.h" 39#include "profiler.h" 40#include "runtime.h" 41#include "gc/accounting/card_table-inl.h" 42#include "gc/accounting/heap_bitmap.h" 43#include "gc/space/space.h" 44#include "mirror/art_field-inl.h" 45#include "mirror/art_method-inl.h" 46#include "mirror/class_loader.h" 47#include "mirror/class-inl.h" 48#include "mirror/dex_cache-inl.h" 49#include "mirror/object-inl.h" 50#include "mirror/object_array-inl.h" 51#include "mirror/throwable.h" 52#include "scoped_thread_state_change.h" 53#include "ScopedLocalRef.h" 54#include "handle_scope-inl.h" 55#include "thread.h" 56#include "thread_pool.h" 57#include "trampolines/trampoline_compiler.h" 58#include "transaction.h" 59#include "verifier/method_verifier.h" 60#include "verifier/method_verifier-inl.h" 61 62namespace art { 63 64static double Percentage(size_t x, size_t y) { 65 return 100.0 * (static_cast<double>(x)) / (static_cast<double>(x + y)); 66} 67 68static void DumpStat(size_t x, size_t y, const char* str) { 69 if (x == 0 && y == 0) { 70 return; 71 } 72 LOG(INFO) << Percentage(x, y) << "% of " << str << " for " << (x + y) << " cases"; 73} 74 75class CompilerDriver::AOTCompilationStats { 76 public: 77 AOTCompilationStats() 78 : stats_lock_("AOT compilation statistics lock"), 79 types_in_dex_cache_(0), types_not_in_dex_cache_(0), 80 strings_in_dex_cache_(0), strings_not_in_dex_cache_(0), 81 resolved_types_(0), unresolved_types_(0), 82 resolved_instance_fields_(0), unresolved_instance_fields_(0), 83 resolved_local_static_fields_(0), resolved_static_fields_(0), unresolved_static_fields_(0), 84 type_based_devirtualization_(0), 85 safe_casts_(0), not_safe_casts_(0) { 86 for (size_t i = 0; i <= kMaxInvokeType; i++) { 87 resolved_methods_[i] = 0; 88 unresolved_methods_[i] = 0; 89 virtual_made_direct_[i] = 0; 90 direct_calls_to_boot_[i] = 0; 91 direct_methods_to_boot_[i] = 0; 92 } 93 } 94 95 void Dump() { 96 DumpStat(types_in_dex_cache_, types_not_in_dex_cache_, "types known to be in dex cache"); 97 DumpStat(strings_in_dex_cache_, strings_not_in_dex_cache_, "strings known to be in dex cache"); 98 DumpStat(resolved_types_, unresolved_types_, "types resolved"); 99 DumpStat(resolved_instance_fields_, unresolved_instance_fields_, "instance fields resolved"); 100 DumpStat(resolved_local_static_fields_ + resolved_static_fields_, unresolved_static_fields_, 101 "static fields resolved"); 102 DumpStat(resolved_local_static_fields_, resolved_static_fields_ + unresolved_static_fields_, 103 "static fields local to a class"); 104 DumpStat(safe_casts_, not_safe_casts_, "check-casts removed based on type information"); 105 // Note, the code below subtracts the stat value so that when added to the stat value we have 106 // 100% of samples. TODO: clean this up. 107 DumpStat(type_based_devirtualization_, 108 resolved_methods_[kVirtual] + unresolved_methods_[kVirtual] + 109 resolved_methods_[kInterface] + unresolved_methods_[kInterface] - 110 type_based_devirtualization_, 111 "virtual/interface calls made direct based on type information"); 112 113 for (size_t i = 0; i <= kMaxInvokeType; i++) { 114 std::ostringstream oss; 115 oss << static_cast<InvokeType>(i) << " methods were AOT resolved"; 116 DumpStat(resolved_methods_[i], unresolved_methods_[i], oss.str().c_str()); 117 if (virtual_made_direct_[i] > 0) { 118 std::ostringstream oss2; 119 oss2 << static_cast<InvokeType>(i) << " methods made direct"; 120 DumpStat(virtual_made_direct_[i], 121 resolved_methods_[i] + unresolved_methods_[i] - virtual_made_direct_[i], 122 oss2.str().c_str()); 123 } 124 if (direct_calls_to_boot_[i] > 0) { 125 std::ostringstream oss2; 126 oss2 << static_cast<InvokeType>(i) << " method calls are direct into boot"; 127 DumpStat(direct_calls_to_boot_[i], 128 resolved_methods_[i] + unresolved_methods_[i] - direct_calls_to_boot_[i], 129 oss2.str().c_str()); 130 } 131 if (direct_methods_to_boot_[i] > 0) { 132 std::ostringstream oss2; 133 oss2 << static_cast<InvokeType>(i) << " method calls have methods in boot"; 134 DumpStat(direct_methods_to_boot_[i], 135 resolved_methods_[i] + unresolved_methods_[i] - direct_methods_to_boot_[i], 136 oss2.str().c_str()); 137 } 138 } 139 } 140 141// Allow lossy statistics in non-debug builds. 142#ifndef NDEBUG 143#define STATS_LOCK() MutexLock mu(Thread::Current(), stats_lock_) 144#else 145#define STATS_LOCK() 146#endif 147 148 void TypeInDexCache() { 149 STATS_LOCK(); 150 types_in_dex_cache_++; 151 } 152 153 void TypeNotInDexCache() { 154 STATS_LOCK(); 155 types_not_in_dex_cache_++; 156 } 157 158 void StringInDexCache() { 159 STATS_LOCK(); 160 strings_in_dex_cache_++; 161 } 162 163 void StringNotInDexCache() { 164 STATS_LOCK(); 165 strings_not_in_dex_cache_++; 166 } 167 168 void TypeDoesntNeedAccessCheck() { 169 STATS_LOCK(); 170 resolved_types_++; 171 } 172 173 void TypeNeedsAccessCheck() { 174 STATS_LOCK(); 175 unresolved_types_++; 176 } 177 178 void ResolvedInstanceField() { 179 STATS_LOCK(); 180 resolved_instance_fields_++; 181 } 182 183 void UnresolvedInstanceField() { 184 STATS_LOCK(); 185 unresolved_instance_fields_++; 186 } 187 188 void ResolvedLocalStaticField() { 189 STATS_LOCK(); 190 resolved_local_static_fields_++; 191 } 192 193 void ResolvedStaticField() { 194 STATS_LOCK(); 195 resolved_static_fields_++; 196 } 197 198 void UnresolvedStaticField() { 199 STATS_LOCK(); 200 unresolved_static_fields_++; 201 } 202 203 // Indicate that type information from the verifier led to devirtualization. 204 void PreciseTypeDevirtualization() { 205 STATS_LOCK(); 206 type_based_devirtualization_++; 207 } 208 209 // Indicate that a method of the given type was resolved at compile time. 210 void ResolvedMethod(InvokeType type) { 211 DCHECK_LE(type, kMaxInvokeType); 212 STATS_LOCK(); 213 resolved_methods_[type]++; 214 } 215 216 // Indicate that a method of the given type was unresolved at compile time as it was in an 217 // unknown dex file. 218 void UnresolvedMethod(InvokeType type) { 219 DCHECK_LE(type, kMaxInvokeType); 220 STATS_LOCK(); 221 unresolved_methods_[type]++; 222 } 223 224 // Indicate that a type of virtual method dispatch has been converted into a direct method 225 // dispatch. 226 void VirtualMadeDirect(InvokeType type) { 227 DCHECK(type == kVirtual || type == kInterface || type == kSuper); 228 STATS_LOCK(); 229 virtual_made_direct_[type]++; 230 } 231 232 // Indicate that a method of the given type was able to call directly into boot. 233 void DirectCallsToBoot(InvokeType type) { 234 DCHECK_LE(type, kMaxInvokeType); 235 STATS_LOCK(); 236 direct_calls_to_boot_[type]++; 237 } 238 239 // Indicate that a method of the given type was able to be resolved directly from boot. 240 void DirectMethodsToBoot(InvokeType type) { 241 DCHECK_LE(type, kMaxInvokeType); 242 STATS_LOCK(); 243 direct_methods_to_boot_[type]++; 244 } 245 246 void ProcessedInvoke(InvokeType type, int flags) { 247 STATS_LOCK(); 248 if (flags == 0) { 249 unresolved_methods_[type]++; 250 } else { 251 DCHECK_NE((flags & kFlagMethodResolved), 0); 252 resolved_methods_[type]++; 253 if ((flags & kFlagVirtualMadeDirect) != 0) { 254 virtual_made_direct_[type]++; 255 if ((flags & kFlagPreciseTypeDevirtualization) != 0) { 256 type_based_devirtualization_++; 257 } 258 } else { 259 DCHECK_EQ((flags & kFlagPreciseTypeDevirtualization), 0); 260 } 261 if ((flags & kFlagDirectCallToBoot) != 0) { 262 direct_calls_to_boot_[type]++; 263 } 264 if ((flags & kFlagDirectMethodToBoot) != 0) { 265 direct_methods_to_boot_[type]++; 266 } 267 } 268 } 269 270 // A check-cast could be eliminated due to verifier type analysis. 271 void SafeCast() { 272 STATS_LOCK(); 273 safe_casts_++; 274 } 275 276 // A check-cast couldn't be eliminated due to verifier type analysis. 277 void NotASafeCast() { 278 STATS_LOCK(); 279 not_safe_casts_++; 280 } 281 282 private: 283 Mutex stats_lock_; 284 285 size_t types_in_dex_cache_; 286 size_t types_not_in_dex_cache_; 287 288 size_t strings_in_dex_cache_; 289 size_t strings_not_in_dex_cache_; 290 291 size_t resolved_types_; 292 size_t unresolved_types_; 293 294 size_t resolved_instance_fields_; 295 size_t unresolved_instance_fields_; 296 297 size_t resolved_local_static_fields_; 298 size_t resolved_static_fields_; 299 size_t unresolved_static_fields_; 300 // Type based devirtualization for invoke interface and virtual. 301 size_t type_based_devirtualization_; 302 303 size_t resolved_methods_[kMaxInvokeType + 1]; 304 size_t unresolved_methods_[kMaxInvokeType + 1]; 305 size_t virtual_made_direct_[kMaxInvokeType + 1]; 306 size_t direct_calls_to_boot_[kMaxInvokeType + 1]; 307 size_t direct_methods_to_boot_[kMaxInvokeType + 1]; 308 309 size_t safe_casts_; 310 size_t not_safe_casts_; 311 312 DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats); 313}; 314 315 316extern "C" art::CompiledMethod* ArtCompileDEX(art::CompilerDriver& compiler, 317 const art::DexFile::CodeItem* code_item, 318 uint32_t access_flags, 319 art::InvokeType invoke_type, 320 uint16_t class_def_idx, 321 uint32_t method_idx, 322 jobject class_loader, 323 const art::DexFile& dex_file); 324 325CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options, 326 VerificationResults* verification_results, 327 DexFileToMethodInlinerMap* method_inliner_map, 328 Compiler::Kind compiler_kind, 329 InstructionSet instruction_set, 330 InstructionSetFeatures instruction_set_features, 331 bool image, std::set<std::string>* image_classes, size_t thread_count, 332 bool dump_stats, bool dump_passes, CumulativeLogger* timer, 333 std::string profile_file) 334 : profile_present_(false), compiler_options_(compiler_options), 335 verification_results_(verification_results), 336 method_inliner_map_(method_inliner_map), 337 compiler_(Compiler::Create(this, compiler_kind)), 338 instruction_set_(instruction_set), 339 instruction_set_features_(instruction_set_features), 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 dex_to_dex_compiler_ = reinterpret_cast<DexToDexCompilerFn>(ArtCompileDEX); 369 370 compiler_->Init(); 371 372 CHECK(!Runtime::Current()->IsStarted()); 373 if (image_) { 374 CHECK(image_classes_.get() != nullptr); 375 } else { 376 CHECK(image_classes_.get() == nullptr); 377 } 378 379 // Are we generating CFI information? 380 if (compiler_options->GetGenerateGDBInformation()) { 381 cfi_info_.reset(compiler_->GetCallFrameInformationInitialization(*this)); 382 } 383 384 // Read the profile file if one is provided. 385 if (!profile_file.empty()) { 386 profile_present_ = profile_file_.LoadFile(profile_file); 387 if (profile_present_) { 388 LOG(INFO) << "Using profile data form file " << profile_file; 389 } else { 390 LOG(INFO) << "Failed to load profile file " << profile_file; 391 } 392 } 393} 394 395std::vector<uint8_t>* CompilerDriver::DeduplicateCode(const std::vector<uint8_t>& code) { 396 return dedupe_code_.Add(Thread::Current(), code); 397} 398 399std::vector<uint8_t>* CompilerDriver::DeduplicateMappingTable(const std::vector<uint8_t>& code) { 400 return dedupe_mapping_table_.Add(Thread::Current(), code); 401} 402 403std::vector<uint8_t>* CompilerDriver::DeduplicateVMapTable(const std::vector<uint8_t>& code) { 404 return dedupe_vmap_table_.Add(Thread::Current(), code); 405} 406 407std::vector<uint8_t>* CompilerDriver::DeduplicateGCMap(const std::vector<uint8_t>& code) { 408 return dedupe_gc_map_.Add(Thread::Current(), code); 409} 410 411std::vector<uint8_t>* CompilerDriver::DeduplicateCFIInfo(const std::vector<uint8_t>* cfi_info) { 412 if (cfi_info == nullptr) { 413 return nullptr; 414 } 415 return dedupe_cfi_info_.Add(Thread::Current(), *cfi_info); 416} 417 418CompilerDriver::~CompilerDriver() { 419 Thread* self = Thread::Current(); 420 { 421 MutexLock mu(self, compiled_classes_lock_); 422 STLDeleteValues(&compiled_classes_); 423 } 424 { 425 MutexLock mu(self, compiled_methods_lock_); 426 STLDeleteValues(&compiled_methods_); 427 } 428 { 429 MutexLock mu(self, compiled_methods_lock_); 430 STLDeleteElements(&code_to_patch_); 431 } 432 { 433 MutexLock mu(self, compiled_methods_lock_); 434 STLDeleteElements(&methods_to_patch_); 435 } 436 { 437 MutexLock mu(self, compiled_methods_lock_); 438 STLDeleteElements(&classes_to_patch_); 439 } 440 CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key"); 441 compiler_->UnInit(); 442} 443 444CompilerTls* CompilerDriver::GetTls() { 445 // Lazily create thread-local storage 446 CompilerTls* res = static_cast<CompilerTls*>(pthread_getspecific(tls_key_)); 447 if (res == NULL) { 448 res = new CompilerTls(); 449 CHECK_PTHREAD_CALL(pthread_setspecific, (tls_key_, res), "compiler tls"); 450 } 451 return res; 452} 453 454#define CREATE_TRAMPOLINE(type, abi, offset) \ 455 if (Is64BitInstructionSet(instruction_set_)) { \ 456 return CreateTrampoline64(instruction_set_, abi, \ 457 type ## _ENTRYPOINT_OFFSET(8, offset)); \ 458 } else { \ 459 return CreateTrampoline32(instruction_set_, abi, \ 460 type ## _ENTRYPOINT_OFFSET(4, offset)); \ 461 } 462 463const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToInterpreterBridge() const { 464 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToInterpreterBridge) 465} 466 467const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToCompiledCodeBridge() const { 468 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToCompiledCodeBridge) 469} 470 471const std::vector<uint8_t>* CompilerDriver::CreateJniDlsymLookup() const { 472 CREATE_TRAMPOLINE(JNI, kJniAbi, pDlsymLookup) 473} 474 475const std::vector<uint8_t>* CompilerDriver::CreatePortableImtConflictTrampoline() const { 476 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableImtConflictTrampoline) 477} 478 479const std::vector<uint8_t>* CompilerDriver::CreatePortableResolutionTrampoline() const { 480 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableResolutionTrampoline) 481} 482 483const std::vector<uint8_t>* CompilerDriver::CreatePortableToInterpreterBridge() const { 484 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableToInterpreterBridge) 485} 486 487const std::vector<uint8_t>* CompilerDriver::CreateQuickGenericJniTrampoline() const { 488 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickGenericJniTrampoline) 489} 490 491const std::vector<uint8_t>* CompilerDriver::CreateQuickImtConflictTrampoline() const { 492 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickImtConflictTrampoline) 493} 494 495const std::vector<uint8_t>* CompilerDriver::CreateQuickResolutionTrampoline() const { 496 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickResolutionTrampoline) 497} 498 499const std::vector<uint8_t>* CompilerDriver::CreateQuickToInterpreterBridge() const { 500 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickToInterpreterBridge) 501} 502#undef CREATE_TRAMPOLINE 503 504void CompilerDriver::CompileAll(jobject class_loader, 505 const std::vector<const DexFile*>& dex_files, 506 TimingLogger* timings) { 507 DCHECK(!Runtime::Current()->IsStarted()); 508 std::unique_ptr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", thread_count_ - 1)); 509 PreCompile(class_loader, dex_files, thread_pool.get(), timings); 510 Compile(class_loader, dex_files, thread_pool.get(), timings); 511 if (dump_stats_) { 512 stats_->Dump(); 513 } 514} 515 516static DexToDexCompilationLevel GetDexToDexCompilationlevel( 517 Thread* self, Handle<mirror::ClassLoader> class_loader, const DexFile& dex_file, 518 const DexFile::ClassDef& class_def) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 519 const char* descriptor = dex_file.GetClassDescriptor(class_def); 520 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 521 mirror::Class* klass = class_linker->FindClass(self, descriptor, class_loader); 522 if (klass == NULL) { 523 CHECK(self->IsExceptionPending()); 524 self->ClearException(); 525 return kDontDexToDexCompile; 526 } 527 // The verifier can only run on "quick" instructions at runtime (see usage of 528 // FindAccessedFieldAtDexPc and FindInvokedMethodAtDexPc in ThrowNullPointerExceptionFromDexPC 529 // function). Since image classes can be verified again while compiling an application, 530 // we must prevent the DEX-to-DEX compiler from introducing them. 531 // TODO: find a way to enable "quick" instructions for image classes and remove this check. 532 bool compiling_image_classes = class_loader.Get() == nullptr; 533 if (compiling_image_classes) { 534 return kRequired; 535 } else if (klass->IsVerified()) { 536 // Class is verified so we can enable DEX-to-DEX compilation for performance. 537 return kOptimize; 538 } else if (klass->IsCompileTimeVerified()) { 539 // Class verification has soft-failed. Anyway, ensure at least correctness. 540 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 541 return kRequired; 542 } else { 543 // Class verification has failed: do not run DEX-to-DEX compilation. 544 return kDontDexToDexCompile; 545 } 546} 547 548void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings) { 549 DCHECK(!Runtime::Current()->IsStarted()); 550 Thread* self = Thread::Current(); 551 jobject jclass_loader; 552 const DexFile* dex_file; 553 uint16_t class_def_idx; 554 uint32_t method_idx = method->GetDexMethodIndex(); 555 uint32_t access_flags = method->GetAccessFlags(); 556 InvokeType invoke_type = method->GetInvokeType(); 557 { 558 ScopedObjectAccessUnchecked soa(self); 559 ScopedLocalRef<jobject> 560 local_class_loader(soa.Env(), 561 soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader())); 562 jclass_loader = soa.Env()->NewGlobalRef(local_class_loader.get()); 563 // Find the dex_file 564 dex_file = method->GetDexFile(); 565 class_def_idx = method->GetClassDefIndex(); 566 } 567 const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset()); 568 self->TransitionFromRunnableToSuspended(kNative); 569 570 std::vector<const DexFile*> dex_files; 571 dex_files.push_back(dex_file); 572 573 std::unique_ptr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", 0U)); 574 PreCompile(jclass_loader, dex_files, thread_pool.get(), timings); 575 576 // Can we run DEX-to-DEX compiler on this class ? 577 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 578 { 579 ScopedObjectAccess soa(Thread::Current()); 580 const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx); 581 StackHandleScope<1> hs(soa.Self()); 582 Handle<mirror::ClassLoader> class_loader( 583 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 584 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(self, class_loader, *dex_file, 585 class_def); 586 } 587 CompileMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx, jclass_loader, 588 *dex_file, dex_to_dex_compilation_level); 589 590 self->GetJniEnv()->DeleteGlobalRef(jclass_loader); 591 592 self->TransitionFromSuspendedToRunnable(); 593} 594 595void CompilerDriver::Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files, 596 ThreadPool* thread_pool, TimingLogger* timings) { 597 for (size_t i = 0; i != dex_files.size(); ++i) { 598 const DexFile* dex_file = dex_files[i]; 599 CHECK(dex_file != nullptr); 600 ResolveDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 601 } 602} 603 604void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 605 ThreadPool* thread_pool, TimingLogger* timings) { 606 LoadImageClasses(timings); 607 608 if (!compiler_options_->IsVerificationEnabled()) { 609 VLOG(compiler) << "Verify none mode specified, skipping pre-compilation"; 610 return; 611 } 612 613 Resolve(class_loader, dex_files, thread_pool, timings); 614 615 Verify(class_loader, dex_files, thread_pool, timings); 616 617 InitializeClasses(class_loader, dex_files, thread_pool, timings); 618 619 UpdateImageClasses(timings); 620} 621 622bool CompilerDriver::IsImageClass(const char* descriptor) const { 623 if (!IsImage()) { 624 return true; 625 } else { 626 return image_classes_->find(descriptor) != image_classes_->end(); 627 } 628} 629 630static void ResolveExceptionsForMethod(MethodHelper* mh, 631 std::set<std::pair<uint16_t, const DexFile*>>& exceptions_to_resolve) 632 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 633 const DexFile::CodeItem* code_item = mh->GetMethod()->GetCodeItem(); 634 if (code_item == NULL) { 635 return; // native or abstract method 636 } 637 if (code_item->tries_size_ == 0) { 638 return; // nothing to process 639 } 640 const byte* encoded_catch_handler_list = DexFile::GetCatchHandlerData(*code_item, 0); 641 size_t num_encoded_catch_handlers = DecodeUnsignedLeb128(&encoded_catch_handler_list); 642 for (size_t i = 0; i < num_encoded_catch_handlers; i++) { 643 int32_t encoded_catch_handler_size = DecodeSignedLeb128(&encoded_catch_handler_list); 644 bool has_catch_all = false; 645 if (encoded_catch_handler_size <= 0) { 646 encoded_catch_handler_size = -encoded_catch_handler_size; 647 has_catch_all = true; 648 } 649 for (int32_t j = 0; j < encoded_catch_handler_size; j++) { 650 uint16_t encoded_catch_handler_handlers_type_idx = 651 DecodeUnsignedLeb128(&encoded_catch_handler_list); 652 // Add to set of types to resolve if not already in the dex cache resolved types 653 if (!mh->GetMethod()->IsResolvedTypeIdx(encoded_catch_handler_handlers_type_idx)) { 654 exceptions_to_resolve.insert( 655 std::pair<uint16_t, const DexFile*>(encoded_catch_handler_handlers_type_idx, 656 mh->GetMethod()->GetDexFile())); 657 } 658 // ignore address associated with catch handler 659 DecodeUnsignedLeb128(&encoded_catch_handler_list); 660 } 661 if (has_catch_all) { 662 // ignore catch all address 663 DecodeUnsignedLeb128(&encoded_catch_handler_list); 664 } 665 } 666} 667 668static bool ResolveCatchBlockExceptionsClassVisitor(mirror::Class* c, void* arg) 669 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 670 std::set<std::pair<uint16_t, const DexFile*>>* exceptions_to_resolve = 671 reinterpret_cast<std::set<std::pair<uint16_t, const DexFile*>>*>(arg); 672 StackHandleScope<1> hs(Thread::Current()); 673 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 674 for (size_t i = 0; i < c->NumVirtualMethods(); ++i) { 675 mh.ChangeMethod(c->GetVirtualMethod(i)); 676 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 677 } 678 for (size_t i = 0; i < c->NumDirectMethods(); ++i) { 679 mh.ChangeMethod(c->GetDirectMethod(i)); 680 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 681 } 682 return true; 683} 684 685static bool RecordImageClassesVisitor(mirror::Class* klass, void* arg) 686 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 687 std::set<std::string>* image_classes = reinterpret_cast<std::set<std::string>*>(arg); 688 std::string temp; 689 image_classes->insert(klass->GetDescriptor(&temp)); 690 return true; 691} 692 693// Make a list of descriptors for classes to include in the image 694void CompilerDriver::LoadImageClasses(TimingLogger* timings) 695 LOCKS_EXCLUDED(Locks::mutator_lock_) { 696 CHECK(timings != nullptr); 697 if (!IsImage()) { 698 return; 699 } 700 701 TimingLogger::ScopedTiming t("LoadImageClasses", timings); 702 // Make a first class to load all classes explicitly listed in the file 703 Thread* self = Thread::Current(); 704 ScopedObjectAccess soa(self); 705 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 706 CHECK(image_classes_.get() != nullptr); 707 for (auto it = image_classes_->begin(), end = image_classes_->end(); it != end;) { 708 const std::string& descriptor(*it); 709 StackHandleScope<1> hs(self); 710 Handle<mirror::Class> klass( 711 hs.NewHandle(class_linker->FindSystemClass(self, descriptor.c_str()))); 712 if (klass.Get() == NULL) { 713 VLOG(compiler) << "Failed to find class " << descriptor; 714 image_classes_->erase(it++); 715 self->ClearException(); 716 } else { 717 ++it; 718 } 719 } 720 721 // Resolve exception classes referenced by the loaded classes. The catch logic assumes 722 // exceptions are resolved by the verifier when there is a catch block in an interested method. 723 // Do this here so that exception classes appear to have been specified image classes. 724 std::set<std::pair<uint16_t, const DexFile*>> unresolved_exception_types; 725 StackHandleScope<1> hs(self); 726 Handle<mirror::Class> java_lang_Throwable( 727 hs.NewHandle(class_linker->FindSystemClass(self, "Ljava/lang/Throwable;"))); 728 do { 729 unresolved_exception_types.clear(); 730 class_linker->VisitClasses(ResolveCatchBlockExceptionsClassVisitor, 731 &unresolved_exception_types); 732 for (const std::pair<uint16_t, const DexFile*>& exception_type : unresolved_exception_types) { 733 uint16_t exception_type_idx = exception_type.first; 734 const DexFile* dex_file = exception_type.second; 735 StackHandleScope<2> hs(self); 736 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(*dex_file))); 737 Handle<mirror::Class> klass(hs.NewHandle( 738 class_linker->ResolveType(*dex_file, exception_type_idx, dex_cache, 739 NullHandle<mirror::ClassLoader>()))); 740 if (klass.Get() == NULL) { 741 const DexFile::TypeId& type_id = dex_file->GetTypeId(exception_type_idx); 742 const char* descriptor = dex_file->GetTypeDescriptor(type_id); 743 LOG(FATAL) << "Failed to resolve class " << descriptor; 744 } 745 DCHECK(java_lang_Throwable->IsAssignableFrom(klass.Get())); 746 } 747 // Resolving exceptions may load classes that reference more exceptions, iterate until no 748 // more are found 749 } while (!unresolved_exception_types.empty()); 750 751 // We walk the roots looking for classes so that we'll pick up the 752 // above classes plus any classes them depend on such super 753 // classes, interfaces, and the required ClassLinker roots. 754 class_linker->VisitClasses(RecordImageClassesVisitor, image_classes_.get()); 755 756 CHECK_NE(image_classes_->size(), 0U); 757} 758 759static void MaybeAddToImageClasses(Handle<mirror::Class> c, std::set<std::string>* image_classes) 760 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 761 Thread* self = Thread::Current(); 762 StackHandleScope<1> hs(self); 763 // Make a copy of the handle so that we don't clobber it doing Assign. 764 Handle<mirror::Class> klass(hs.NewHandle(c.Get())); 765 std::string temp; 766 while (!klass->IsObjectClass()) { 767 const char* descriptor = klass->GetDescriptor(&temp); 768 std::pair<std::set<std::string>::iterator, bool> result = image_classes->insert(descriptor); 769 if (!result.second) { // Previously inserted. 770 break; 771 } 772 VLOG(compiler) << "Adding " << descriptor << " to image classes"; 773 for (size_t i = 0; i < klass->NumDirectInterfaces(); ++i) { 774 StackHandleScope<1> hs(self); 775 MaybeAddToImageClasses(hs.NewHandle(mirror::Class::GetDirectInterface(self, klass, i)), 776 image_classes); 777 } 778 if (klass->IsArrayClass()) { 779 StackHandleScope<1> hs(self); 780 MaybeAddToImageClasses(hs.NewHandle(klass->GetComponentType()), image_classes); 781 } 782 klass.Assign(klass->GetSuperClass()); 783 } 784} 785 786void CompilerDriver::FindClinitImageClassesCallback(mirror::Object* object, void* arg) { 787 DCHECK(object != NULL); 788 DCHECK(arg != NULL); 789 CompilerDriver* compiler_driver = reinterpret_cast<CompilerDriver*>(arg); 790 StackHandleScope<1> hs(Thread::Current()); 791 MaybeAddToImageClasses(hs.NewHandle(object->GetClass()), compiler_driver->image_classes_.get()); 792} 793 794void CompilerDriver::UpdateImageClasses(TimingLogger* timings) { 795 if (IsImage()) { 796 TimingLogger::ScopedTiming t("UpdateImageClasses", timings); 797 // Update image_classes_ with classes for objects created by <clinit> methods. 798 Thread* self = Thread::Current(); 799 const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); 800 gc::Heap* heap = Runtime::Current()->GetHeap(); 801 // TODO: Image spaces only? 802 ScopedObjectAccess soa(Thread::Current()); 803 WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 804 heap->VisitObjects(FindClinitImageClassesCallback, this); 805 self->EndAssertNoThreadSuspension(old_cause); 806 } 807} 808 809bool CompilerDriver::CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx) { 810 if (IsImage() && 811 IsImageClass(dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_))) { 812 { 813 ScopedObjectAccess soa(Thread::Current()); 814 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 815 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 816 if (resolved_class == nullptr) { 817 // Erroneous class. 818 stats_->TypeNotInDexCache(); 819 return false; 820 } 821 } 822 stats_->TypeInDexCache(); 823 return true; 824 } else { 825 stats_->TypeNotInDexCache(); 826 return false; 827 } 828} 829 830bool CompilerDriver::CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, 831 uint32_t string_idx) { 832 // See also Compiler::ResolveDexFile 833 834 bool result = false; 835 if (IsImage()) { 836 // We resolve all const-string strings when building for the image. 837 ScopedObjectAccess soa(Thread::Current()); 838 StackHandleScope<1> hs(soa.Self()); 839 Handle<mirror::DexCache> dex_cache( 840 hs.NewHandle(Runtime::Current()->GetClassLinker()->FindDexCache(dex_file))); 841 Runtime::Current()->GetClassLinker()->ResolveString(dex_file, string_idx, dex_cache); 842 result = true; 843 } 844 if (result) { 845 stats_->StringInDexCache(); 846 } else { 847 stats_->StringNotInDexCache(); 848 } 849 return result; 850} 851 852bool CompilerDriver::CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file, 853 uint32_t type_idx, 854 bool* type_known_final, bool* type_known_abstract, 855 bool* equals_referrers_class) { 856 if (type_known_final != NULL) { 857 *type_known_final = false; 858 } 859 if (type_known_abstract != NULL) { 860 *type_known_abstract = false; 861 } 862 if (equals_referrers_class != NULL) { 863 *equals_referrers_class = false; 864 } 865 ScopedObjectAccess soa(Thread::Current()); 866 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 867 // Get type from dex cache assuming it was populated by the verifier 868 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 869 if (resolved_class == NULL) { 870 stats_->TypeNeedsAccessCheck(); 871 return false; // Unknown class needs access checks. 872 } 873 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 874 if (equals_referrers_class != NULL) { 875 *equals_referrers_class = (method_id.class_idx_ == type_idx); 876 } 877 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 878 if (referrer_class == NULL) { 879 stats_->TypeNeedsAccessCheck(); 880 return false; // Incomplete referrer knowledge needs access check. 881 } 882 // Perform access check, will return true if access is ok or false if we're going to have to 883 // check this at runtime (for example for class loaders). 884 bool result = referrer_class->CanAccess(resolved_class); 885 if (result) { 886 stats_->TypeDoesntNeedAccessCheck(); 887 if (type_known_final != NULL) { 888 *type_known_final = resolved_class->IsFinal() && !resolved_class->IsArrayClass(); 889 } 890 if (type_known_abstract != NULL) { 891 *type_known_abstract = resolved_class->IsAbstract() && !resolved_class->IsArrayClass(); 892 } 893 } else { 894 stats_->TypeNeedsAccessCheck(); 895 } 896 return result; 897} 898 899bool CompilerDriver::CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, 900 const DexFile& dex_file, 901 uint32_t type_idx) { 902 ScopedObjectAccess soa(Thread::Current()); 903 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 904 // Get type from dex cache assuming it was populated by the verifier. 905 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 906 if (resolved_class == NULL) { 907 stats_->TypeNeedsAccessCheck(); 908 return false; // Unknown class needs access checks. 909 } 910 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 911 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 912 if (referrer_class == NULL) { 913 stats_->TypeNeedsAccessCheck(); 914 return false; // Incomplete referrer knowledge needs access check. 915 } 916 // Perform access and instantiable checks, will return true if access is ok or false if we're 917 // going to have to check this at runtime (for example for class loaders). 918 bool result = referrer_class->CanAccess(resolved_class) && resolved_class->IsInstantiable(); 919 if (result) { 920 stats_->TypeDoesntNeedAccessCheck(); 921 } else { 922 stats_->TypeNeedsAccessCheck(); 923 } 924 return result; 925} 926 927bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx, 928 bool* is_type_initialized, bool* use_direct_type_ptr, 929 uintptr_t* direct_type_ptr, bool* out_is_finalizable) { 930 ScopedObjectAccess soa(Thread::Current()); 931 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 932 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 933 if (resolved_class == nullptr) { 934 return false; 935 } 936 *out_is_finalizable = resolved_class->IsFinalizable(); 937 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 938 const bool support_boot_image_fixup = GetSupportBootImageFixup(); 939 if (compiling_boot) { 940 // boot -> boot class pointers. 941 // True if the class is in the image at boot compiling time. 942 const bool is_image_class = IsImage() && IsImageClass( 943 dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_)); 944 // True if pc relative load works. 945 if (is_image_class && support_boot_image_fixup) { 946 *is_type_initialized = resolved_class->IsInitialized(); 947 *use_direct_type_ptr = false; 948 *direct_type_ptr = 0; 949 return true; 950 } else { 951 return false; 952 } 953 } else { 954 // True if the class is in the image at app compiling time. 955 const bool class_in_image = 956 Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace(); 957 if (class_in_image && support_boot_image_fixup) { 958 // boot -> app class pointers. 959 *is_type_initialized = resolved_class->IsInitialized(); 960 // TODO This is somewhat hacky. We should refactor all of this invoke codepath. 961 *use_direct_type_ptr = !GetCompilerOptions().GetIncludePatchInformation(); 962 *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class); 963 return true; 964 } else { 965 // app -> app class pointers. 966 // Give up because app does not have an image and class 967 // isn't created at compile time. TODO: implement this 968 // if/when each app gets an image. 969 return false; 970 } 971 } 972} 973 974void CompilerDriver::ProcessedInstanceField(bool resolved) { 975 if (!resolved) { 976 stats_->UnresolvedInstanceField(); 977 } else { 978 stats_->ResolvedInstanceField(); 979 } 980} 981 982void CompilerDriver::ProcessedStaticField(bool resolved, bool local) { 983 if (!resolved) { 984 stats_->UnresolvedStaticField(); 985 } else if (local) { 986 stats_->ResolvedLocalStaticField(); 987 } else { 988 stats_->ResolvedStaticField(); 989 } 990} 991 992void CompilerDriver::ProcessedInvoke(InvokeType invoke_type, int flags) { 993 stats_->ProcessedInvoke(invoke_type, flags); 994} 995 996mirror::ArtField* CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, 997 const DexCompilationUnit* mUnit, 998 bool is_put, 999 const ScopedObjectAccess& soa) { 1000 // Try to resolve the field and compiling method's class. 1001 mirror::ArtField* resolved_field; 1002 mirror::Class* referrer_class; 1003 mirror::DexCache* dex_cache; 1004 { 1005 StackHandleScope<3> hs(soa.Self()); 1006 Handle<mirror::DexCache> dex_cache_handle( 1007 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1008 Handle<mirror::ClassLoader> class_loader_handle( 1009 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1010 Handle<mirror::ArtField> resolved_field_handle(hs.NewHandle( 1011 ResolveField(soa, dex_cache_handle, class_loader_handle, mUnit, field_idx, false))); 1012 referrer_class = (resolved_field_handle.Get() != nullptr) 1013 ? ResolveCompilingMethodsClass(soa, dex_cache_handle, class_loader_handle, mUnit) : nullptr; 1014 resolved_field = resolved_field_handle.Get(); 1015 dex_cache = dex_cache_handle.Get(); 1016 } 1017 bool can_link = false; 1018 if (resolved_field != nullptr && referrer_class != nullptr) { 1019 std::pair<bool, bool> fast_path = IsFastInstanceField( 1020 dex_cache, referrer_class, resolved_field, field_idx); 1021 can_link = is_put ? fast_path.second : fast_path.first; 1022 } 1023 ProcessedInstanceField(can_link); 1024 return can_link ? resolved_field : nullptr; 1025} 1026 1027bool CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 1028 bool is_put, MemberOffset* field_offset, 1029 bool* is_volatile) { 1030 ScopedObjectAccess soa(Thread::Current()); 1031 StackHandleScope<1> hs(soa.Self()); 1032 Handle<mirror::ArtField> resolved_field = 1033 hs.NewHandle(ComputeInstanceFieldInfo(field_idx, mUnit, is_put, soa)); 1034 1035 if (resolved_field.Get() == nullptr) { 1036 // Conservative defaults. 1037 *is_volatile = true; 1038 *field_offset = MemberOffset(static_cast<size_t>(-1)); 1039 return false; 1040 } else { 1041 *is_volatile = resolved_field->IsVolatile(); 1042 *field_offset = resolved_field->GetOffset(); 1043 return true; 1044 } 1045} 1046 1047bool CompilerDriver::ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 1048 bool is_put, MemberOffset* field_offset, 1049 uint32_t* storage_index, bool* is_referrers_class, 1050 bool* is_volatile, bool* is_initialized) { 1051 ScopedObjectAccess soa(Thread::Current()); 1052 // Try to resolve the field and compiling method's class. 1053 mirror::ArtField* resolved_field; 1054 mirror::Class* referrer_class; 1055 mirror::DexCache* dex_cache; 1056 { 1057 StackHandleScope<3> hs(soa.Self()); 1058 Handle<mirror::DexCache> dex_cache_handle( 1059 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1060 Handle<mirror::ClassLoader> class_loader_handle( 1061 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1062 Handle<mirror::ArtField> resolved_field_handle(hs.NewHandle( 1063 ResolveField(soa, dex_cache_handle, class_loader_handle, mUnit, field_idx, true))); 1064 referrer_class = (resolved_field_handle.Get() != nullptr) 1065 ? ResolveCompilingMethodsClass(soa, dex_cache_handle, class_loader_handle, mUnit) : nullptr; 1066 resolved_field = resolved_field_handle.Get(); 1067 dex_cache = dex_cache_handle.Get(); 1068 } 1069 bool result = false; 1070 if (resolved_field != nullptr && referrer_class != nullptr) { 1071 *is_volatile = IsFieldVolatile(resolved_field); 1072 std::pair<bool, bool> fast_path = IsFastStaticField( 1073 dex_cache, referrer_class, resolved_field, field_idx, field_offset, 1074 storage_index, is_referrers_class, is_initialized); 1075 result = is_put ? fast_path.second : fast_path.first; 1076 } 1077 if (!result) { 1078 // Conservative defaults. 1079 *is_volatile = true; 1080 *field_offset = MemberOffset(static_cast<size_t>(-1)); 1081 *storage_index = -1; 1082 *is_referrers_class = false; 1083 *is_initialized = false; 1084 } 1085 ProcessedStaticField(result, *is_referrers_class); 1086 return result; 1087} 1088 1089void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type, 1090 bool no_guarantee_of_dex_cache_entry, 1091 mirror::Class* referrer_class, 1092 mirror::ArtMethod* method, 1093 int* stats_flags, 1094 MethodReference* target_method, 1095 uintptr_t* direct_code, 1096 uintptr_t* direct_method) { 1097 // For direct and static methods compute possible direct_code and direct_method values, ie 1098 // an address for the Method* being invoked and an address of the code for that Method*. 1099 // For interface calls compute a value for direct_method that is the interface method being 1100 // invoked, so this can be passed to the out-of-line runtime support code. 1101 *direct_code = 0; 1102 *direct_method = 0; 1103 bool use_dex_cache = false; 1104 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 1105 // TODO This is somewhat hacky. We should refactor all of this invoke codepath. 1106 const bool force_relocations = (compiling_boot || 1107 GetCompilerOptions().GetIncludePatchInformation()); 1108 if (compiler_->IsPortable()) { 1109 if (sharp_type != kStatic && sharp_type != kDirect) { 1110 return; 1111 } 1112 use_dex_cache = true; 1113 } else { 1114 if (sharp_type != kStatic && sharp_type != kDirect) { 1115 return; 1116 } 1117 // TODO: support patching on all architectures. 1118 use_dex_cache = force_relocations && !support_boot_image_fixup_; 1119 } 1120 bool method_code_in_boot = (method->GetDeclaringClass()->GetClassLoader() == nullptr); 1121 if (!use_dex_cache) { 1122 if (!method_code_in_boot) { 1123 use_dex_cache = true; 1124 } else { 1125 bool has_clinit_trampoline = 1126 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 1127 if (has_clinit_trampoline && (method->GetDeclaringClass() != referrer_class)) { 1128 // Ensure we run the clinit trampoline unless we are invoking a static method in the same 1129 // class. 1130 use_dex_cache = true; 1131 } 1132 } 1133 } 1134 if (method_code_in_boot) { 1135 *stats_flags |= kFlagDirectCallToBoot | kFlagDirectMethodToBoot; 1136 } 1137 if (!use_dex_cache && force_relocations) { 1138 if (!IsImage() || !IsImageClass(method->GetDeclaringClassDescriptor())) { 1139 // We can only branch directly to Methods that are resolved in the DexCache. 1140 // Otherwise we won't invoke the resolution trampoline. 1141 use_dex_cache = true; 1142 } 1143 } 1144 // The method is defined not within this dex file. We need a dex cache slot within the current 1145 // dex file or direct pointers. 1146 bool must_use_direct_pointers = false; 1147 if (target_method->dex_file == method->GetDeclaringClass()->GetDexCache()->GetDexFile()) { 1148 target_method->dex_method_index = method->GetDexMethodIndex(); 1149 } else { 1150 if (no_guarantee_of_dex_cache_entry) { 1151 StackHandleScope<1> hs(Thread::Current()); 1152 MethodHelper mh(hs.NewHandle(method)); 1153 // See if the method is also declared in this dex cache. 1154 uint32_t dex_method_idx = mh.FindDexMethodIndexInOtherDexFile( 1155 *target_method->dex_file, target_method->dex_method_index); 1156 if (dex_method_idx != DexFile::kDexNoIndex) { 1157 target_method->dex_method_index = dex_method_idx; 1158 } else { 1159 if (force_relocations && !use_dex_cache) { 1160 target_method->dex_method_index = method->GetDexMethodIndex(); 1161 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1162 } 1163 must_use_direct_pointers = true; 1164 } 1165 } 1166 } 1167 if (use_dex_cache) { 1168 if (must_use_direct_pointers) { 1169 // Fail. Test above showed the only safe dispatch was via the dex cache, however, the direct 1170 // pointers are required as the dex cache lacks an appropriate entry. 1171 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1172 } else { 1173 *type = sharp_type; 1174 } 1175 } else { 1176 bool method_in_image = 1177 Runtime::Current()->GetHeap()->FindSpaceFromObject(method, false)->IsImageSpace(); 1178 if (method_in_image || compiling_boot) { 1179 // We know we must be able to get to the method in the image, so use that pointer. 1180 CHECK(!method->IsAbstract()); 1181 *type = sharp_type; 1182 *direct_method = force_relocations ? -1 : reinterpret_cast<uintptr_t>(method); 1183 *direct_code = force_relocations ? -1 : compiler_->GetEntryPointOf(method); 1184 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1185 target_method->dex_method_index = method->GetDexMethodIndex(); 1186 } else if (!must_use_direct_pointers) { 1187 // Set the code and rely on the dex cache for the method. 1188 *type = sharp_type; 1189 if (force_relocations) { 1190 *direct_code = -1; 1191 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1192 target_method->dex_method_index = method->GetDexMethodIndex(); 1193 } else { 1194 *direct_code = compiler_->GetEntryPointOf(method); 1195 } 1196 } else { 1197 // Direct pointers were required but none were available. 1198 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1199 } 1200 } 1201} 1202 1203bool CompilerDriver::ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc, 1204 bool update_stats, bool enable_devirtualization, 1205 InvokeType* invoke_type, MethodReference* target_method, 1206 int* vtable_idx, uintptr_t* direct_code, 1207 uintptr_t* direct_method) { 1208 InvokeType orig_invoke_type = *invoke_type; 1209 int stats_flags = 0; 1210 ScopedObjectAccess soa(Thread::Current()); 1211 // Try to resolve the method and compiling method's class. 1212 mirror::ArtMethod* resolved_method; 1213 mirror::Class* referrer_class; 1214 StackHandleScope<3> hs(soa.Self()); 1215 Handle<mirror::DexCache> dex_cache( 1216 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1217 Handle<mirror::ClassLoader> class_loader(hs.NewHandle( 1218 soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1219 { 1220 uint32_t method_idx = target_method->dex_method_index; 1221 Handle<mirror::ArtMethod> resolved_method_handle(hs.NewHandle( 1222 ResolveMethod(soa, dex_cache, class_loader, mUnit, method_idx, orig_invoke_type))); 1223 referrer_class = (resolved_method_handle.Get() != nullptr) 1224 ? ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit) : nullptr; 1225 resolved_method = resolved_method_handle.Get(); 1226 } 1227 bool result = false; 1228 if (resolved_method != nullptr) { 1229 *vtable_idx = GetResolvedMethodVTableIndex(resolved_method, orig_invoke_type); 1230 1231 if (enable_devirtualization) { 1232 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1233 const MethodReference* devirt_target = mUnit->GetVerifiedMethod()->GetDevirtTarget(dex_pc); 1234 1235 stats_flags = IsFastInvoke( 1236 soa, dex_cache, class_loader, mUnit, referrer_class, resolved_method, 1237 invoke_type, target_method, devirt_target, direct_code, direct_method); 1238 result = stats_flags != 0; 1239 } else { 1240 // Devirtualization not enabled. Inline IsFastInvoke(), dropping the devirtualization parts. 1241 if (UNLIKELY(referrer_class == nullptr) || 1242 UNLIKELY(!referrer_class->CanAccessResolvedMethod(resolved_method->GetDeclaringClass(), 1243 resolved_method, dex_cache.Get(), 1244 target_method->dex_method_index)) || 1245 *invoke_type == kSuper) { 1246 // Slow path. (Without devirtualization, all super calls go slow path as well.) 1247 } else { 1248 // Sharpening failed so generate a regular resolved method dispatch. 1249 stats_flags = kFlagMethodResolved; 1250 GetCodeAndMethodForDirectCall(invoke_type, *invoke_type, false, referrer_class, resolved_method, 1251 &stats_flags, target_method, direct_code, direct_method); 1252 result = true; 1253 } 1254 } 1255 } 1256 if (!result) { 1257 // Conservative defaults. 1258 *vtable_idx = -1; 1259 *direct_code = 0u; 1260 *direct_method = 0u; 1261 } 1262 if (update_stats) { 1263 ProcessedInvoke(orig_invoke_type, stats_flags); 1264 } 1265 return result; 1266} 1267 1268const VerifiedMethod* CompilerDriver::GetVerifiedMethod(const DexFile* dex_file, 1269 uint32_t method_idx) const { 1270 MethodReference ref(dex_file, method_idx); 1271 return verification_results_->GetVerifiedMethod(ref); 1272} 1273 1274bool CompilerDriver::IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc) { 1275 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1276 bool result = mUnit->GetVerifiedMethod()->IsSafeCast(dex_pc); 1277 if (result) { 1278 stats_->SafeCast(); 1279 } else { 1280 stats_->NotASafeCast(); 1281 } 1282 return result; 1283} 1284 1285void CompilerDriver::AddCodePatch(const DexFile* dex_file, 1286 uint16_t referrer_class_def_idx, 1287 uint32_t referrer_method_idx, 1288 InvokeType referrer_invoke_type, 1289 uint32_t target_method_idx, 1290 const DexFile* target_dex_file, 1291 InvokeType target_invoke_type, 1292 size_t literal_offset) { 1293 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1294 code_to_patch_.push_back(new CallPatchInformation(dex_file, 1295 referrer_class_def_idx, 1296 referrer_method_idx, 1297 referrer_invoke_type, 1298 target_method_idx, 1299 target_dex_file, 1300 target_invoke_type, 1301 literal_offset)); 1302} 1303void CompilerDriver::AddRelativeCodePatch(const DexFile* dex_file, 1304 uint16_t referrer_class_def_idx, 1305 uint32_t referrer_method_idx, 1306 InvokeType referrer_invoke_type, 1307 uint32_t target_method_idx, 1308 const DexFile* target_dex_file, 1309 InvokeType target_invoke_type, 1310 size_t literal_offset, 1311 int32_t pc_relative_offset) { 1312 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1313 code_to_patch_.push_back(new RelativeCallPatchInformation(dex_file, 1314 referrer_class_def_idx, 1315 referrer_method_idx, 1316 referrer_invoke_type, 1317 target_method_idx, 1318 target_dex_file, 1319 target_invoke_type, 1320 literal_offset, 1321 pc_relative_offset)); 1322} 1323void CompilerDriver::AddMethodPatch(const DexFile* dex_file, 1324 uint16_t referrer_class_def_idx, 1325 uint32_t referrer_method_idx, 1326 InvokeType referrer_invoke_type, 1327 uint32_t target_method_idx, 1328 const DexFile* target_dex_file, 1329 InvokeType target_invoke_type, 1330 size_t literal_offset) { 1331 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1332 methods_to_patch_.push_back(new CallPatchInformation(dex_file, 1333 referrer_class_def_idx, 1334 referrer_method_idx, 1335 referrer_invoke_type, 1336 target_method_idx, 1337 target_dex_file, 1338 target_invoke_type, 1339 literal_offset)); 1340} 1341void CompilerDriver::AddClassPatch(const DexFile* dex_file, 1342 uint16_t referrer_class_def_idx, 1343 uint32_t referrer_method_idx, 1344 uint32_t target_type_idx, 1345 size_t literal_offset) { 1346 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1347 classes_to_patch_.push_back(new TypePatchInformation(dex_file, 1348 referrer_class_def_idx, 1349 referrer_method_idx, 1350 target_type_idx, 1351 literal_offset)); 1352} 1353 1354class ParallelCompilationManager { 1355 public: 1356 typedef void Callback(const ParallelCompilationManager* manager, size_t index); 1357 1358 ParallelCompilationManager(ClassLinker* class_linker, 1359 jobject class_loader, 1360 CompilerDriver* compiler, 1361 const DexFile* dex_file, 1362 const std::vector<const DexFile*>& dex_files, 1363 ThreadPool* thread_pool) 1364 : index_(0), 1365 class_linker_(class_linker), 1366 class_loader_(class_loader), 1367 compiler_(compiler), 1368 dex_file_(dex_file), 1369 dex_files_(dex_files), 1370 thread_pool_(thread_pool) {} 1371 1372 ClassLinker* GetClassLinker() const { 1373 CHECK(class_linker_ != NULL); 1374 return class_linker_; 1375 } 1376 1377 jobject GetClassLoader() const { 1378 return class_loader_; 1379 } 1380 1381 CompilerDriver* GetCompiler() const { 1382 CHECK(compiler_ != NULL); 1383 return compiler_; 1384 } 1385 1386 const DexFile* GetDexFile() const { 1387 CHECK(dex_file_ != NULL); 1388 return dex_file_; 1389 } 1390 1391 const std::vector<const DexFile*>& GetDexFiles() const { 1392 return dex_files_; 1393 } 1394 1395 void ForAll(size_t begin, size_t end, Callback callback, size_t work_units) { 1396 Thread* self = Thread::Current(); 1397 self->AssertNoPendingException(); 1398 CHECK_GT(work_units, 0U); 1399 1400 index_.StoreRelaxed(begin); 1401 for (size_t i = 0; i < work_units; ++i) { 1402 thread_pool_->AddTask(self, new ForAllClosure(this, end, callback)); 1403 } 1404 thread_pool_->StartWorkers(self); 1405 1406 // Ensure we're suspended while we're blocked waiting for the other threads to finish (worker 1407 // thread destructor's called below perform join). 1408 CHECK_NE(self->GetState(), kRunnable); 1409 1410 // Wait for all the worker threads to finish. 1411 thread_pool_->Wait(self, true, false); 1412 } 1413 1414 size_t NextIndex() { 1415 return index_.FetchAndAddSequentiallyConsistent(1); 1416 } 1417 1418 private: 1419 class ForAllClosure : public Task { 1420 public: 1421 ForAllClosure(ParallelCompilationManager* manager, size_t end, Callback* callback) 1422 : manager_(manager), 1423 end_(end), 1424 callback_(callback) {} 1425 1426 virtual void Run(Thread* self) { 1427 while (true) { 1428 const size_t index = manager_->NextIndex(); 1429 if (UNLIKELY(index >= end_)) { 1430 break; 1431 } 1432 callback_(manager_, index); 1433 self->AssertNoPendingException(); 1434 } 1435 } 1436 1437 virtual void Finalize() { 1438 delete this; 1439 } 1440 1441 private: 1442 ParallelCompilationManager* const manager_; 1443 const size_t end_; 1444 Callback* const callback_; 1445 }; 1446 1447 AtomicInteger index_; 1448 ClassLinker* const class_linker_; 1449 const jobject class_loader_; 1450 CompilerDriver* const compiler_; 1451 const DexFile* const dex_file_; 1452 const std::vector<const DexFile*>& dex_files_; 1453 ThreadPool* const thread_pool_; 1454 1455 DISALLOW_COPY_AND_ASSIGN(ParallelCompilationManager); 1456}; 1457 1458static bool SkipClassCheckClassPath(const char* descriptor, const DexFile& dex_file, 1459 const std::vector<const DexFile*>& classpath) { 1460 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, classpath); 1461 CHECK(pair.second != NULL); 1462 if (pair.first != &dex_file) { 1463 LOG(WARNING) << "Skipping class " << descriptor << " from " << dex_file.GetLocation() 1464 << " previously found in " << pair.first->GetLocation(); 1465 return true; 1466 } 1467 return false; 1468} 1469 1470// Return true if the class should be skipped during compilation. 1471// 1472// The first case where we skip is for redundant class definitions in 1473// the boot classpath. We skip all but the first definition in that case. 1474// 1475// The second case where we skip is when an app bundles classes found 1476// in the boot classpath. Since at runtime we will select the class from 1477// the boot classpath, we ignore the one from the app. 1478// 1479// The third case is if the app itself has the class defined in multiple dex files. Then we skip 1480// it if it is not the first occurrence. 1481static bool SkipClass(ClassLinker* class_linker, jobject class_loader, const DexFile& dex_file, 1482 const std::vector<const DexFile*>& dex_files, 1483 const DexFile::ClassDef& class_def) { 1484 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1485 1486 if (class_loader == NULL) { 1487 return SkipClassCheckClassPath(descriptor, dex_file, class_linker->GetBootClassPath()); 1488 } 1489 1490 if (class_linker->IsInBootClassPath(descriptor)) { 1491 return true; 1492 } 1493 1494 return SkipClassCheckClassPath(descriptor, dex_file, dex_files); 1495} 1496 1497// A fast version of SkipClass above if the class pointer is available 1498// that avoids the expensive FindInClassPath search. 1499static bool SkipClass(jobject class_loader, const DexFile& dex_file, mirror::Class* klass) 1500 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1501 DCHECK(klass != NULL); 1502 const DexFile& original_dex_file = *klass->GetDexCache()->GetDexFile(); 1503 if (&dex_file != &original_dex_file) { 1504 if (class_loader == NULL) { 1505 LOG(WARNING) << "Skipping class " << PrettyDescriptor(klass) << " from " 1506 << dex_file.GetLocation() << " previously found in " 1507 << original_dex_file.GetLocation(); 1508 } 1509 return true; 1510 } 1511 return false; 1512} 1513 1514static void CheckAndClearResolveException(Thread* self) 1515 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1516 CHECK(self->IsExceptionPending()); 1517 mirror::Throwable* exception = self->GetException(nullptr); 1518 std::string temp; 1519 const char* descriptor = exception->GetClass()->GetDescriptor(&temp); 1520 const char* expected_exceptions[] = { 1521 "Ljava/lang/IllegalAccessError;", 1522 "Ljava/lang/IncompatibleClassChangeError;", 1523 "Ljava/lang/InstantiationError;", 1524 "Ljava/lang/NoClassDefFoundError;", 1525 "Ljava/lang/NoSuchFieldError;", 1526 "Ljava/lang/NoSuchMethodError;" 1527 }; 1528 bool found = false; 1529 for (size_t i = 0; (found == false) && (i < arraysize(expected_exceptions)); ++i) { 1530 if (strcmp(descriptor, expected_exceptions[i]) == 0) { 1531 found = true; 1532 } 1533 } 1534 if (!found) { 1535 LOG(FATAL) << "Unexpected exeption " << exception->Dump(); 1536 } 1537 self->ClearException(); 1538} 1539 1540static void ResolveClassFieldsAndMethods(const ParallelCompilationManager* manager, 1541 size_t class_def_index) 1542 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1543 ATRACE_CALL(); 1544 Thread* self = Thread::Current(); 1545 jobject jclass_loader = manager->GetClassLoader(); 1546 const DexFile& dex_file = *manager->GetDexFile(); 1547 ClassLinker* class_linker = manager->GetClassLinker(); 1548 1549 // If an instance field is final then we need to have a barrier on the return, static final 1550 // fields are assigned within the lock held for class initialization. Conservatively assume 1551 // constructor barriers are always required. 1552 bool requires_constructor_barrier = true; 1553 1554 // Method and Field are the worst. We can't resolve without either 1555 // context from the code use (to disambiguate virtual vs direct 1556 // method and instance vs static field) or from class 1557 // definitions. While the compiler will resolve what it can as it 1558 // needs it, here we try to resolve fields and methods used in class 1559 // definitions, since many of them many never be referenced by 1560 // generated code. 1561 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1562 if (!SkipClass(class_linker, jclass_loader, dex_file, manager->GetDexFiles(), class_def)) { 1563 ScopedObjectAccess soa(self); 1564 StackHandleScope<2> hs(soa.Self()); 1565 Handle<mirror::ClassLoader> class_loader( 1566 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1567 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1568 // Resolve the class. 1569 mirror::Class* klass = class_linker->ResolveType(dex_file, class_def.class_idx_, dex_cache, 1570 class_loader); 1571 bool resolve_fields_and_methods; 1572 if (klass == NULL) { 1573 // Class couldn't be resolved, for example, super-class is in a different dex file. Don't 1574 // attempt to resolve methods and fields when there is no declaring class. 1575 CheckAndClearResolveException(soa.Self()); 1576 resolve_fields_and_methods = false; 1577 } else { 1578 resolve_fields_and_methods = manager->GetCompiler()->IsImage(); 1579 } 1580 // Note the class_data pointer advances through the headers, 1581 // static fields, instance fields, direct methods, and virtual 1582 // methods. 1583 const byte* class_data = dex_file.GetClassData(class_def); 1584 if (class_data == NULL) { 1585 // Empty class such as a marker interface. 1586 requires_constructor_barrier = false; 1587 } else { 1588 ClassDataItemIterator it(dex_file, class_data); 1589 while (it.HasNextStaticField()) { 1590 if (resolve_fields_and_methods) { 1591 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1592 dex_cache, class_loader, true); 1593 if (field == NULL) { 1594 CheckAndClearResolveException(soa.Self()); 1595 } 1596 } 1597 it.Next(); 1598 } 1599 // We require a constructor barrier if there are final instance fields. 1600 requires_constructor_barrier = false; 1601 while (it.HasNextInstanceField()) { 1602 if ((it.GetMemberAccessFlags() & kAccFinal) != 0) { 1603 requires_constructor_barrier = true; 1604 } 1605 if (resolve_fields_and_methods) { 1606 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1607 dex_cache, class_loader, false); 1608 if (field == NULL) { 1609 CheckAndClearResolveException(soa.Self()); 1610 } 1611 } 1612 it.Next(); 1613 } 1614 if (resolve_fields_and_methods) { 1615 while (it.HasNextDirectMethod()) { 1616 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1617 dex_cache, class_loader, 1618 NullHandle<mirror::ArtMethod>(), 1619 it.GetMethodInvokeType(class_def)); 1620 if (method == NULL) { 1621 CheckAndClearResolveException(soa.Self()); 1622 } 1623 it.Next(); 1624 } 1625 while (it.HasNextVirtualMethod()) { 1626 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1627 dex_cache, class_loader, 1628 NullHandle<mirror::ArtMethod>(), 1629 it.GetMethodInvokeType(class_def)); 1630 if (method == NULL) { 1631 CheckAndClearResolveException(soa.Self()); 1632 } 1633 it.Next(); 1634 } 1635 DCHECK(!it.HasNext()); 1636 } 1637 } 1638 } 1639 if (requires_constructor_barrier) { 1640 manager->GetCompiler()->AddRequiresConstructorBarrier(self, &dex_file, class_def_index); 1641 } 1642} 1643 1644static void ResolveType(const ParallelCompilationManager* manager, size_t type_idx) 1645 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1646 // Class derived values are more complicated, they require the linker and loader. 1647 ScopedObjectAccess soa(Thread::Current()); 1648 ClassLinker* class_linker = manager->GetClassLinker(); 1649 const DexFile& dex_file = *manager->GetDexFile(); 1650 StackHandleScope<2> hs(soa.Self()); 1651 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1652 Handle<mirror::ClassLoader> class_loader( 1653 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(manager->GetClassLoader()))); 1654 mirror::Class* klass = class_linker->ResolveType(dex_file, type_idx, dex_cache, class_loader); 1655 1656 if (klass == NULL) { 1657 CHECK(soa.Self()->IsExceptionPending()); 1658 mirror::Throwable* exception = soa.Self()->GetException(NULL); 1659 VLOG(compiler) << "Exception during type resolution: " << exception->Dump(); 1660 if (exception->GetClass()->DescriptorEquals("Ljava/lang/OutOfMemoryError;")) { 1661 // There's little point continuing compilation if the heap is exhausted. 1662 LOG(FATAL) << "Out of memory during type resolution for compilation"; 1663 } 1664 soa.Self()->ClearException(); 1665 } 1666} 1667 1668void CompilerDriver::ResolveDexFile(jobject class_loader, const DexFile& dex_file, 1669 const std::vector<const DexFile*>& dex_files, 1670 ThreadPool* thread_pool, TimingLogger* timings) { 1671 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1672 1673 // TODO: we could resolve strings here, although the string table is largely filled with class 1674 // and method names. 1675 1676 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, dex_files, 1677 thread_pool); 1678 if (IsImage()) { 1679 // For images we resolve all types, such as array, whereas for applications just those with 1680 // classdefs are resolved by ResolveClassFieldsAndMethods. 1681 TimingLogger::ScopedTiming t("Resolve Types", timings); 1682 context.ForAll(0, dex_file.NumTypeIds(), ResolveType, thread_count_); 1683 } 1684 1685 TimingLogger::ScopedTiming t("Resolve MethodsAndFields", timings); 1686 context.ForAll(0, dex_file.NumClassDefs(), ResolveClassFieldsAndMethods, thread_count_); 1687} 1688 1689void CompilerDriver::Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1690 ThreadPool* thread_pool, TimingLogger* timings) { 1691 for (size_t i = 0; i != dex_files.size(); ++i) { 1692 const DexFile* dex_file = dex_files[i]; 1693 CHECK(dex_file != NULL); 1694 VerifyDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 1695 } 1696} 1697 1698static void VerifyClass(const ParallelCompilationManager* manager, size_t class_def_index) 1699 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1700 ATRACE_CALL(); 1701 ScopedObjectAccess soa(Thread::Current()); 1702 const DexFile& dex_file = *manager->GetDexFile(); 1703 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1704 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1705 ClassLinker* class_linker = manager->GetClassLinker(); 1706 jobject jclass_loader = manager->GetClassLoader(); 1707 StackHandleScope<3> hs(soa.Self()); 1708 Handle<mirror::ClassLoader> class_loader( 1709 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1710 Handle<mirror::Class> klass( 1711 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor, class_loader))); 1712 if (klass.Get() == nullptr) { 1713 CHECK(soa.Self()->IsExceptionPending()); 1714 soa.Self()->ClearException(); 1715 1716 /* 1717 * At compile time, we can still structurally verify the class even if FindClass fails. 1718 * This is to ensure the class is structurally sound for compilation. An unsound class 1719 * will be rejected by the verifier and later skipped during compilation in the compiler. 1720 */ 1721 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1722 std::string error_msg; 1723 if (verifier::MethodVerifier::VerifyClass(&dex_file, dex_cache, class_loader, &class_def, true, 1724 &error_msg) == 1725 verifier::MethodVerifier::kHardFailure) { 1726 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(descriptor) 1727 << " because: " << error_msg; 1728 } 1729 } else if (!SkipClass(jclass_loader, dex_file, klass.Get())) { 1730 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()); 1731 class_linker->VerifyClass(klass); 1732 1733 if (klass->IsErroneous()) { 1734 // ClassLinker::VerifyClass throws, which isn't useful in the compiler. 1735 CHECK(soa.Self()->IsExceptionPending()); 1736 soa.Self()->ClearException(); 1737 } 1738 1739 CHECK(klass->IsCompileTimeVerified() || klass->IsErroneous()) 1740 << PrettyDescriptor(klass.Get()) << ": state=" << klass->GetStatus(); 1741 } 1742 soa.Self()->AssertNoPendingException(); 1743} 1744 1745void CompilerDriver::VerifyDexFile(jobject class_loader, const DexFile& dex_file, 1746 const std::vector<const DexFile*>& dex_files, 1747 ThreadPool* thread_pool, TimingLogger* timings) { 1748 TimingLogger::ScopedTiming t("Verify Dex File", timings); 1749 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1750 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, dex_files, 1751 thread_pool); 1752 context.ForAll(0, dex_file.NumClassDefs(), VerifyClass, thread_count_); 1753} 1754 1755static void InitializeClass(const ParallelCompilationManager* manager, size_t class_def_index) 1756 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1757 ATRACE_CALL(); 1758 jobject jclass_loader = manager->GetClassLoader(); 1759 const DexFile& dex_file = *manager->GetDexFile(); 1760 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1761 const DexFile::TypeId& class_type_id = dex_file.GetTypeId(class_def.class_idx_); 1762 const char* descriptor = dex_file.StringDataByIdx(class_type_id.descriptor_idx_); 1763 1764 ScopedObjectAccess soa(Thread::Current()); 1765 StackHandleScope<3> hs(soa.Self()); 1766 Handle<mirror::ClassLoader> class_loader( 1767 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1768 Handle<mirror::Class> klass( 1769 hs.NewHandle(manager->GetClassLinker()->FindClass(soa.Self(), descriptor, class_loader))); 1770 1771 if (klass.Get() != nullptr && !SkipClass(jclass_loader, dex_file, klass.Get())) { 1772 // Only try to initialize classes that were successfully verified. 1773 if (klass->IsVerified()) { 1774 // Attempt to initialize the class but bail if we either need to initialize the super-class 1775 // or static fields. 1776 manager->GetClassLinker()->EnsureInitialized(klass, false, false); 1777 if (!klass->IsInitialized()) { 1778 // We don't want non-trivial class initialization occurring on multiple threads due to 1779 // deadlock problems. For example, a parent class is initialized (holding its lock) that 1780 // refers to a sub-class in its static/class initializer causing it to try to acquire the 1781 // sub-class' lock. While on a second thread the sub-class is initialized (holding its lock) 1782 // after first initializing its parents, whose locks are acquired. This leads to a 1783 // parent-to-child and a child-to-parent lock ordering and consequent potential deadlock. 1784 // We need to use an ObjectLock due to potential suspension in the interpreting code. Rather 1785 // than use a special Object for the purpose we use the Class of java.lang.Class. 1786 Handle<mirror::Class> h_klass(hs.NewHandle(klass->GetClass())); 1787 ObjectLock<mirror::Class> lock(soa.Self(), h_klass); 1788 // Attempt to initialize allowing initialization of parent classes but still not static 1789 // fields. 1790 manager->GetClassLinker()->EnsureInitialized(klass, false, true); 1791 if (!klass->IsInitialized()) { 1792 // We need to initialize static fields, we only do this for image classes that aren't 1793 // marked with the $NoPreloadHolder (which implies this should not be initialized early). 1794 bool can_init_static_fields = manager->GetCompiler()->IsImage() && 1795 manager->GetCompiler()->IsImageClass(descriptor) && 1796 !StringPiece(descriptor).ends_with("$NoPreloadHolder;"); 1797 if (can_init_static_fields) { 1798 VLOG(compiler) << "Initializing: " << descriptor; 1799 // TODO multithreading support. We should ensure the current compilation thread has 1800 // exclusive access to the runtime and the transaction. To achieve this, we could use 1801 // a ReaderWriterMutex but we're holding the mutator lock so we fail mutex sanity 1802 // checks in Thread::AssertThreadSuspensionIsAllowable. 1803 Runtime* const runtime = Runtime::Current(); 1804 Transaction transaction; 1805 1806 // Run the class initializer in transaction mode. 1807 runtime->EnterTransactionMode(&transaction); 1808 const mirror::Class::Status old_status = klass->GetStatus(); 1809 bool success = manager->GetClassLinker()->EnsureInitialized(klass, true, true); 1810 // TODO we detach transaction from runtime to indicate we quit the transactional 1811 // mode which prevents the GC from visiting objects modified during the transaction. 1812 // Ensure GC is not run so don't access freed objects when aborting transaction. 1813 const char* old_casue = soa.Self()->StartAssertNoThreadSuspension("Transaction end"); 1814 runtime->ExitTransactionMode(); 1815 1816 if (!success) { 1817 CHECK(soa.Self()->IsExceptionPending()); 1818 ThrowLocation throw_location; 1819 mirror::Throwable* exception = soa.Self()->GetException(&throw_location); 1820 VLOG(compiler) << "Initialization of " << descriptor << " aborted because of " 1821 << exception->Dump(); 1822 soa.Self()->ClearException(); 1823 transaction.Abort(); 1824 CHECK_EQ(old_status, klass->GetStatus()) << "Previous class status not restored"; 1825 } 1826 soa.Self()->EndAssertNoThreadSuspension(old_casue); 1827 } 1828 } 1829 soa.Self()->AssertNoPendingException(); 1830 } 1831 } 1832 // Record the final class status if necessary. 1833 ClassReference ref(manager->GetDexFile(), class_def_index); 1834 manager->GetCompiler()->RecordClassStatus(ref, klass->GetStatus()); 1835 } 1836 // Clear any class not found or verification exceptions. 1837 soa.Self()->ClearException(); 1838} 1839 1840void CompilerDriver::InitializeClasses(jobject jni_class_loader, const DexFile& dex_file, 1841 const std::vector<const DexFile*>& dex_files, 1842 ThreadPool* thread_pool, TimingLogger* timings) { 1843 TimingLogger::ScopedTiming t("InitializeNoClinit", timings); 1844 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1845 ParallelCompilationManager context(class_linker, jni_class_loader, this, &dex_file, dex_files, 1846 thread_pool); 1847 size_t thread_count; 1848 if (IsImage()) { 1849 // TODO: remove this when transactional mode supports multithreading. 1850 thread_count = 1U; 1851 } else { 1852 thread_count = thread_count_; 1853 } 1854 context.ForAll(0, dex_file.NumClassDefs(), InitializeClass, thread_count); 1855 if (IsImage()) { 1856 // Prune garbage objects created during aborted transactions. 1857 Runtime::Current()->GetHeap()->CollectGarbage(true); 1858 } 1859} 1860 1861void CompilerDriver::InitializeClasses(jobject class_loader, 1862 const std::vector<const DexFile*>& dex_files, 1863 ThreadPool* thread_pool, TimingLogger* timings) { 1864 for (size_t i = 0; i != dex_files.size(); ++i) { 1865 const DexFile* dex_file = dex_files[i]; 1866 CHECK(dex_file != NULL); 1867 InitializeClasses(class_loader, *dex_file, dex_files, thread_pool, timings); 1868 } 1869} 1870 1871void CompilerDriver::Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1872 ThreadPool* thread_pool, TimingLogger* timings) { 1873 for (size_t i = 0; i != dex_files.size(); ++i) { 1874 const DexFile* dex_file = dex_files[i]; 1875 CHECK(dex_file != NULL); 1876 CompileDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 1877 } 1878} 1879 1880void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, size_t class_def_index) { 1881 ATRACE_CALL(); 1882 const DexFile& dex_file = *manager->GetDexFile(); 1883 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1884 ClassLinker* class_linker = manager->GetClassLinker(); 1885 jobject jclass_loader = manager->GetClassLoader(); 1886 { 1887 // Use a scoped object access to perform to the quick SkipClass check. 1888 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1889 ScopedObjectAccess soa(Thread::Current()); 1890 StackHandleScope<3> hs(soa.Self()); 1891 Handle<mirror::ClassLoader> class_loader( 1892 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1893 Handle<mirror::Class> klass( 1894 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor, class_loader))); 1895 if (klass.Get() == nullptr) { 1896 CHECK(soa.Self()->IsExceptionPending()); 1897 soa.Self()->ClearException(); 1898 } else if (SkipClass(jclass_loader, dex_file, klass.Get())) { 1899 return; 1900 } 1901 } 1902 ClassReference ref(&dex_file, class_def_index); 1903 // Skip compiling classes with generic verifier failures since they will still fail at runtime 1904 if (manager->GetCompiler()->verification_results_->IsClassRejected(ref)) { 1905 return; 1906 } 1907 const byte* class_data = dex_file.GetClassData(class_def); 1908 if (class_data == NULL) { 1909 // empty class, probably a marker interface 1910 return; 1911 } 1912 1913 // Can we run DEX-to-DEX compiler on this class ? 1914 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 1915 { 1916 ScopedObjectAccess soa(Thread::Current()); 1917 StackHandleScope<1> hs(soa.Self()); 1918 Handle<mirror::ClassLoader> class_loader( 1919 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1920 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(soa.Self(), class_loader, dex_file, 1921 class_def); 1922 } 1923 ClassDataItemIterator it(dex_file, class_data); 1924 // Skip fields 1925 while (it.HasNextStaticField()) { 1926 it.Next(); 1927 } 1928 while (it.HasNextInstanceField()) { 1929 it.Next(); 1930 } 1931 CompilerDriver* driver = manager->GetCompiler(); 1932 // Compile direct methods 1933 int64_t previous_direct_method_idx = -1; 1934 while (it.HasNextDirectMethod()) { 1935 uint32_t method_idx = it.GetMemberIndex(); 1936 if (method_idx == previous_direct_method_idx) { 1937 // smali can create dex files with two encoded_methods sharing the same method_idx 1938 // http://code.google.com/p/smali/issues/detail?id=119 1939 it.Next(); 1940 continue; 1941 } 1942 previous_direct_method_idx = method_idx; 1943 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1944 it.GetMethodInvokeType(class_def), class_def_index, 1945 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1946 it.Next(); 1947 } 1948 // Compile virtual methods 1949 int64_t previous_virtual_method_idx = -1; 1950 while (it.HasNextVirtualMethod()) { 1951 uint32_t method_idx = it.GetMemberIndex(); 1952 if (method_idx == previous_virtual_method_idx) { 1953 // smali can create dex files with two encoded_methods sharing the same method_idx 1954 // http://code.google.com/p/smali/issues/detail?id=119 1955 it.Next(); 1956 continue; 1957 } 1958 previous_virtual_method_idx = method_idx; 1959 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1960 it.GetMethodInvokeType(class_def), class_def_index, 1961 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1962 it.Next(); 1963 } 1964 DCHECK(!it.HasNext()); 1965} 1966 1967void CompilerDriver::CompileDexFile(jobject class_loader, const DexFile& dex_file, 1968 const std::vector<const DexFile*>& dex_files, 1969 ThreadPool* thread_pool, TimingLogger* timings) { 1970 TimingLogger::ScopedTiming t("Compile Dex File", timings); 1971 ParallelCompilationManager context(Runtime::Current()->GetClassLinker(), class_loader, this, 1972 &dex_file, dex_files, thread_pool); 1973 context.ForAll(0, dex_file.NumClassDefs(), CompilerDriver::CompileClass, thread_count_); 1974} 1975 1976void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags, 1977 InvokeType invoke_type, uint16_t class_def_idx, 1978 uint32_t method_idx, jobject class_loader, 1979 const DexFile& dex_file, 1980 DexToDexCompilationLevel dex_to_dex_compilation_level) { 1981 CompiledMethod* compiled_method = NULL; 1982 uint64_t start_ns = NanoTime(); 1983 1984 if ((access_flags & kAccNative) != 0) { 1985 // Are we interpreting only and have support for generic JNI down calls? 1986 if (!compiler_options_->IsCompilationEnabled() && 1987 (instruction_set_ == kX86_64 || instruction_set_ == kArm64)) { 1988 // Leaving this empty will trigger the generic JNI version 1989 } else { 1990 compiled_method = compiler_->JniCompile(access_flags, method_idx, dex_file); 1991 CHECK(compiled_method != NULL); 1992 } 1993 } else if ((access_flags & kAccAbstract) != 0) { 1994 } else { 1995 MethodReference method_ref(&dex_file, method_idx); 1996 bool compile = verification_results_->IsCandidateForCompilation(method_ref, access_flags); 1997 if (compile) { 1998 // NOTE: if compiler declines to compile this method, it will return NULL. 1999 compiled_method = compiler_->Compile(code_item, access_flags, invoke_type, class_def_idx, 2000 method_idx, class_loader, dex_file); 2001 } 2002 if (compiled_method == nullptr && dex_to_dex_compilation_level != kDontDexToDexCompile) { 2003 // TODO: add a command-line option to disable DEX-to-DEX compilation ? 2004 (*dex_to_dex_compiler_)(*this, code_item, access_flags, 2005 invoke_type, class_def_idx, 2006 method_idx, class_loader, dex_file, 2007 dex_to_dex_compilation_level); 2008 } 2009 } 2010 uint64_t duration_ns = NanoTime() - start_ns; 2011 if (duration_ns > MsToNs(compiler_->GetMaximumCompilationTimeBeforeWarning()) && !kIsDebugBuild) { 2012 LOG(WARNING) << "Compilation of " << PrettyMethod(method_idx, dex_file) 2013 << " took " << PrettyDuration(duration_ns); 2014 } 2015 2016 Thread* self = Thread::Current(); 2017 if (compiled_method != NULL) { 2018 MethodReference ref(&dex_file, method_idx); 2019 DCHECK(GetCompiledMethod(ref) == NULL) << PrettyMethod(method_idx, dex_file); 2020 { 2021 MutexLock mu(self, compiled_methods_lock_); 2022 compiled_methods_.Put(ref, compiled_method); 2023 } 2024 DCHECK(GetCompiledMethod(ref) != NULL) << PrettyMethod(method_idx, dex_file); 2025 } 2026 2027 if (self->IsExceptionPending()) { 2028 ScopedObjectAccess soa(self); 2029 LOG(FATAL) << "Unexpected exception compiling: " << PrettyMethod(method_idx, dex_file) << "\n" 2030 << self->GetException(NULL)->Dump(); 2031 } 2032} 2033 2034CompiledClass* CompilerDriver::GetCompiledClass(ClassReference ref) const { 2035 MutexLock mu(Thread::Current(), compiled_classes_lock_); 2036 ClassTable::const_iterator it = compiled_classes_.find(ref); 2037 if (it == compiled_classes_.end()) { 2038 return NULL; 2039 } 2040 CHECK(it->second != NULL); 2041 return it->second; 2042} 2043 2044void CompilerDriver::RecordClassStatus(ClassReference ref, mirror::Class::Status status) { 2045 MutexLock mu(Thread::Current(), compiled_classes_lock_); 2046 auto it = compiled_classes_.find(ref); 2047 if (it == compiled_classes_.end() || it->second->GetStatus() != status) { 2048 // An entry doesn't exist or the status is lower than the new status. 2049 if (it != compiled_classes_.end()) { 2050 CHECK_GT(status, it->second->GetStatus()); 2051 delete it->second; 2052 } 2053 switch (status) { 2054 case mirror::Class::kStatusNotReady: 2055 case mirror::Class::kStatusError: 2056 case mirror::Class::kStatusRetryVerificationAtRuntime: 2057 case mirror::Class::kStatusVerified: 2058 case mirror::Class::kStatusInitialized: 2059 break; // Expected states. 2060 default: 2061 LOG(FATAL) << "Unexpected class status for class " 2062 << PrettyDescriptor(ref.first->GetClassDescriptor(ref.first->GetClassDef(ref.second))) 2063 << " of " << status; 2064 } 2065 CompiledClass* compiled_class = new CompiledClass(status); 2066 compiled_classes_.Overwrite(ref, compiled_class); 2067 } 2068} 2069 2070CompiledMethod* CompilerDriver::GetCompiledMethod(MethodReference ref) const { 2071 MutexLock mu(Thread::Current(), compiled_methods_lock_); 2072 MethodTable::const_iterator it = compiled_methods_.find(ref); 2073 if (it == compiled_methods_.end()) { 2074 return NULL; 2075 } 2076 CHECK(it->second != NULL); 2077 return it->second; 2078} 2079 2080void CompilerDriver::AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2081 uint16_t class_def_index) { 2082 WriterMutexLock mu(self, freezing_constructor_lock_); 2083 freezing_constructor_classes_.insert(ClassReference(dex_file, class_def_index)); 2084} 2085 2086bool CompilerDriver::RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2087 uint16_t class_def_index) { 2088 ReaderMutexLock mu(self, freezing_constructor_lock_); 2089 return freezing_constructor_classes_.count(ClassReference(dex_file, class_def_index)) != 0; 2090} 2091 2092bool CompilerDriver::WriteElf(const std::string& android_root, 2093 bool is_host, 2094 const std::vector<const art::DexFile*>& dex_files, 2095 OatWriter* oat_writer, 2096 art::File* file) 2097 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2098 return compiler_->WriteElf(file, oat_writer, dex_files, android_root, is_host); 2099} 2100void CompilerDriver::InstructionSetToLLVMTarget(InstructionSet instruction_set, 2101 std::string* target_triple, 2102 std::string* target_cpu, 2103 std::string* target_attr) { 2104 switch (instruction_set) { 2105 case kThumb2: 2106 *target_triple = "thumb-none-linux-gnueabi"; 2107 *target_cpu = "cortex-a9"; 2108 *target_attr = "+thumb2,+neon,+neonfp,+vfp3,+db"; 2109 break; 2110 2111 case kArm: 2112 *target_triple = "armv7-none-linux-gnueabi"; 2113 // TODO: Fix for Nexus S. 2114 *target_cpu = "cortex-a9"; 2115 // TODO: Fix for Xoom. 2116 *target_attr = "+v7,+neon,+neonfp,+vfp3,+db"; 2117 break; 2118 2119 case kX86: 2120 *target_triple = "i386-pc-linux-gnu"; 2121 *target_attr = ""; 2122 break; 2123 2124 case kX86_64: 2125 *target_triple = "x86_64-pc-linux-gnu"; 2126 *target_attr = ""; 2127 break; 2128 2129 case kMips: 2130 *target_triple = "mipsel-unknown-linux"; 2131 *target_attr = "mips32r2"; 2132 break; 2133 2134 default: 2135 LOG(FATAL) << "Unknown instruction set: " << instruction_set; 2136 } 2137 } 2138 2139bool CompilerDriver::SkipCompilation(const std::string& method_name) { 2140 if (!profile_present_) { 2141 return false; 2142 } 2143 // First find the method in the profile file. 2144 ProfileFile::ProfileData data; 2145 if (!profile_file_.GetProfileData(&data, method_name)) { 2146 // Not in profile, no information can be determined. 2147 if (kIsDebugBuild) { 2148 VLOG(compiler) << "not compiling " << method_name << " because it's not in the profile"; 2149 } 2150 return true; 2151 } 2152 2153 // Methods that comprise top_k_threshold % of the total samples will be compiled. 2154 // Compare against the start of the topK percentage bucket just in case the threshold 2155 // falls inside a bucket. 2156 bool compile = data.GetTopKUsedPercentage() - data.GetUsedPercent() 2157 <= compiler_options_->GetTopKProfileThreshold(); 2158 if (kIsDebugBuild) { 2159 if (compile) { 2160 LOG(INFO) << "compiling method " << method_name << " because its usage is part of top " 2161 << data.GetTopKUsedPercentage() << "% with a percent of " << data.GetUsedPercent() << "%" 2162 << " (topKThreshold=" << compiler_options_->GetTopKProfileThreshold() << ")"; 2163 } else { 2164 VLOG(compiler) << "not compiling method " << method_name 2165 << " because it's not part of leading " << compiler_options_->GetTopKProfileThreshold() 2166 << "% samples)"; 2167 } 2168 } 2169 return !compile; 2170} 2171} // namespace art 2172