compiler_driver.cc revision b68c6e578a28a9717d78dfd522d9d9b8befaedf2
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 constexpr bool kTimeCompileMethod = !kIsDebugBuild; 65 66static double Percentage(size_t x, size_t y) { 67 return 100.0 * (static_cast<double>(x)) / (static_cast<double>(x + y)); 68} 69 70static void DumpStat(size_t x, size_t y, const char* str) { 71 if (x == 0 && y == 0) { 72 return; 73 } 74 LOG(INFO) << Percentage(x, y) << "% of " << str << " for " << (x + y) << " cases"; 75} 76 77class CompilerDriver::AOTCompilationStats { 78 public: 79 AOTCompilationStats() 80 : stats_lock_("AOT compilation statistics lock"), 81 types_in_dex_cache_(0), types_not_in_dex_cache_(0), 82 strings_in_dex_cache_(0), strings_not_in_dex_cache_(0), 83 resolved_types_(0), unresolved_types_(0), 84 resolved_instance_fields_(0), unresolved_instance_fields_(0), 85 resolved_local_static_fields_(0), resolved_static_fields_(0), unresolved_static_fields_(0), 86 type_based_devirtualization_(0), 87 safe_casts_(0), not_safe_casts_(0) { 88 for (size_t i = 0; i <= kMaxInvokeType; i++) { 89 resolved_methods_[i] = 0; 90 unresolved_methods_[i] = 0; 91 virtual_made_direct_[i] = 0; 92 direct_calls_to_boot_[i] = 0; 93 direct_methods_to_boot_[i] = 0; 94 } 95 } 96 97 void Dump() { 98 DumpStat(types_in_dex_cache_, types_not_in_dex_cache_, "types known to be in dex cache"); 99 DumpStat(strings_in_dex_cache_, strings_not_in_dex_cache_, "strings known to be in dex cache"); 100 DumpStat(resolved_types_, unresolved_types_, "types resolved"); 101 DumpStat(resolved_instance_fields_, unresolved_instance_fields_, "instance fields resolved"); 102 DumpStat(resolved_local_static_fields_ + resolved_static_fields_, unresolved_static_fields_, 103 "static fields resolved"); 104 DumpStat(resolved_local_static_fields_, resolved_static_fields_ + unresolved_static_fields_, 105 "static fields local to a class"); 106 DumpStat(safe_casts_, not_safe_casts_, "check-casts removed based on type information"); 107 // Note, the code below subtracts the stat value so that when added to the stat value we have 108 // 100% of samples. TODO: clean this up. 109 DumpStat(type_based_devirtualization_, 110 resolved_methods_[kVirtual] + unresolved_methods_[kVirtual] + 111 resolved_methods_[kInterface] + unresolved_methods_[kInterface] - 112 type_based_devirtualization_, 113 "virtual/interface calls made direct based on type information"); 114 115 for (size_t i = 0; i <= kMaxInvokeType; i++) { 116 std::ostringstream oss; 117 oss << static_cast<InvokeType>(i) << " methods were AOT resolved"; 118 DumpStat(resolved_methods_[i], unresolved_methods_[i], oss.str().c_str()); 119 if (virtual_made_direct_[i] > 0) { 120 std::ostringstream oss2; 121 oss2 << static_cast<InvokeType>(i) << " methods made direct"; 122 DumpStat(virtual_made_direct_[i], 123 resolved_methods_[i] + unresolved_methods_[i] - virtual_made_direct_[i], 124 oss2.str().c_str()); 125 } 126 if (direct_calls_to_boot_[i] > 0) { 127 std::ostringstream oss2; 128 oss2 << static_cast<InvokeType>(i) << " method calls are direct into boot"; 129 DumpStat(direct_calls_to_boot_[i], 130 resolved_methods_[i] + unresolved_methods_[i] - direct_calls_to_boot_[i], 131 oss2.str().c_str()); 132 } 133 if (direct_methods_to_boot_[i] > 0) { 134 std::ostringstream oss2; 135 oss2 << static_cast<InvokeType>(i) << " method calls have methods in boot"; 136 DumpStat(direct_methods_to_boot_[i], 137 resolved_methods_[i] + unresolved_methods_[i] - direct_methods_to_boot_[i], 138 oss2.str().c_str()); 139 } 140 } 141 } 142 143// Allow lossy statistics in non-debug builds. 144#ifndef NDEBUG 145#define STATS_LOCK() MutexLock mu(Thread::Current(), stats_lock_) 146#else 147#define STATS_LOCK() 148#endif 149 150 void TypeInDexCache() { 151 STATS_LOCK(); 152 types_in_dex_cache_++; 153 } 154 155 void TypeNotInDexCache() { 156 STATS_LOCK(); 157 types_not_in_dex_cache_++; 158 } 159 160 void StringInDexCache() { 161 STATS_LOCK(); 162 strings_in_dex_cache_++; 163 } 164 165 void StringNotInDexCache() { 166 STATS_LOCK(); 167 strings_not_in_dex_cache_++; 168 } 169 170 void TypeDoesntNeedAccessCheck() { 171 STATS_LOCK(); 172 resolved_types_++; 173 } 174 175 void TypeNeedsAccessCheck() { 176 STATS_LOCK(); 177 unresolved_types_++; 178 } 179 180 void ResolvedInstanceField() { 181 STATS_LOCK(); 182 resolved_instance_fields_++; 183 } 184 185 void UnresolvedInstanceField() { 186 STATS_LOCK(); 187 unresolved_instance_fields_++; 188 } 189 190 void ResolvedLocalStaticField() { 191 STATS_LOCK(); 192 resolved_local_static_fields_++; 193 } 194 195 void ResolvedStaticField() { 196 STATS_LOCK(); 197 resolved_static_fields_++; 198 } 199 200 void UnresolvedStaticField() { 201 STATS_LOCK(); 202 unresolved_static_fields_++; 203 } 204 205 // Indicate that type information from the verifier led to devirtualization. 206 void PreciseTypeDevirtualization() { 207 STATS_LOCK(); 208 type_based_devirtualization_++; 209 } 210 211 // Indicate that a method of the given type was resolved at compile time. 212 void ResolvedMethod(InvokeType type) { 213 DCHECK_LE(type, kMaxInvokeType); 214 STATS_LOCK(); 215 resolved_methods_[type]++; 216 } 217 218 // Indicate that a method of the given type was unresolved at compile time as it was in an 219 // unknown dex file. 220 void UnresolvedMethod(InvokeType type) { 221 DCHECK_LE(type, kMaxInvokeType); 222 STATS_LOCK(); 223 unresolved_methods_[type]++; 224 } 225 226 // Indicate that a type of virtual method dispatch has been converted into a direct method 227 // dispatch. 228 void VirtualMadeDirect(InvokeType type) { 229 DCHECK(type == kVirtual || type == kInterface || type == kSuper); 230 STATS_LOCK(); 231 virtual_made_direct_[type]++; 232 } 233 234 // Indicate that a method of the given type was able to call directly into boot. 235 void DirectCallsToBoot(InvokeType type) { 236 DCHECK_LE(type, kMaxInvokeType); 237 STATS_LOCK(); 238 direct_calls_to_boot_[type]++; 239 } 240 241 // Indicate that a method of the given type was able to be resolved directly from boot. 242 void DirectMethodsToBoot(InvokeType type) { 243 DCHECK_LE(type, kMaxInvokeType); 244 STATS_LOCK(); 245 direct_methods_to_boot_[type]++; 246 } 247 248 void ProcessedInvoke(InvokeType type, int flags) { 249 STATS_LOCK(); 250 if (flags == 0) { 251 unresolved_methods_[type]++; 252 } else { 253 DCHECK_NE((flags & kFlagMethodResolved), 0); 254 resolved_methods_[type]++; 255 if ((flags & kFlagVirtualMadeDirect) != 0) { 256 virtual_made_direct_[type]++; 257 if ((flags & kFlagPreciseTypeDevirtualization) != 0) { 258 type_based_devirtualization_++; 259 } 260 } else { 261 DCHECK_EQ((flags & kFlagPreciseTypeDevirtualization), 0); 262 } 263 if ((flags & kFlagDirectCallToBoot) != 0) { 264 direct_calls_to_boot_[type]++; 265 } 266 if ((flags & kFlagDirectMethodToBoot) != 0) { 267 direct_methods_to_boot_[type]++; 268 } 269 } 270 } 271 272 // A check-cast could be eliminated due to verifier type analysis. 273 void SafeCast() { 274 STATS_LOCK(); 275 safe_casts_++; 276 } 277 278 // A check-cast couldn't be eliminated due to verifier type analysis. 279 void NotASafeCast() { 280 STATS_LOCK(); 281 not_safe_casts_++; 282 } 283 284 private: 285 Mutex stats_lock_; 286 287 size_t types_in_dex_cache_; 288 size_t types_not_in_dex_cache_; 289 290 size_t strings_in_dex_cache_; 291 size_t strings_not_in_dex_cache_; 292 293 size_t resolved_types_; 294 size_t unresolved_types_; 295 296 size_t resolved_instance_fields_; 297 size_t unresolved_instance_fields_; 298 299 size_t resolved_local_static_fields_; 300 size_t resolved_static_fields_; 301 size_t unresolved_static_fields_; 302 // Type based devirtualization for invoke interface and virtual. 303 size_t type_based_devirtualization_; 304 305 size_t resolved_methods_[kMaxInvokeType + 1]; 306 size_t unresolved_methods_[kMaxInvokeType + 1]; 307 size_t virtual_made_direct_[kMaxInvokeType + 1]; 308 size_t direct_calls_to_boot_[kMaxInvokeType + 1]; 309 size_t direct_methods_to_boot_[kMaxInvokeType + 1]; 310 311 size_t safe_casts_; 312 size_t not_safe_casts_; 313 314 DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats); 315}; 316 317 318extern "C" art::CompiledMethod* ArtCompileDEX(art::CompilerDriver& compiler, 319 const art::DexFile::CodeItem* code_item, 320 uint32_t access_flags, 321 art::InvokeType invoke_type, 322 uint16_t class_def_idx, 323 uint32_t method_idx, 324 jobject class_loader, 325 const art::DexFile& dex_file); 326 327CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options, 328 VerificationResults* verification_results, 329 DexFileToMethodInlinerMap* method_inliner_map, 330 Compiler::Kind compiler_kind, 331 InstructionSet instruction_set, 332 InstructionSetFeatures instruction_set_features, 333 bool image, std::set<std::string>* image_classes, size_t thread_count, 334 bool dump_stats, bool dump_passes, CumulativeLogger* timer, 335 std::string profile_file) 336 : profile_present_(false), compiler_options_(compiler_options), 337 verification_results_(verification_results), 338 method_inliner_map_(method_inliner_map), 339 compiler_(Compiler::Create(this, compiler_kind)), 340 instruction_set_(instruction_set), 341 instruction_set_features_(instruction_set_features), 342 freezing_constructor_lock_("freezing constructor lock"), 343 compiled_classes_lock_("compiled classes lock"), 344 compiled_methods_lock_("compiled method lock"), 345 image_(image), 346 image_classes_(image_classes), 347 thread_count_(thread_count), 348 start_ns_(0), 349 stats_(new AOTCompilationStats), 350 dump_stats_(dump_stats), 351 dump_passes_(dump_passes), 352 timings_logger_(timer), 353 compiler_library_(NULL), 354 compiler_context_(NULL), 355 compiler_enable_auto_elf_loading_(NULL), 356 compiler_get_method_code_addr_(NULL), 357 support_boot_image_fixup_(instruction_set != kMips), 358 cfi_info_(nullptr), 359 dedupe_code_("dedupe code"), 360 dedupe_mapping_table_("dedupe mapping table"), 361 dedupe_vmap_table_("dedupe vmap table"), 362 dedupe_gc_map_("dedupe gc map"), 363 dedupe_cfi_info_("dedupe cfi info") { 364 DCHECK(compiler_options_ != nullptr); 365 DCHECK(verification_results_ != nullptr); 366 DCHECK(method_inliner_map_ != nullptr); 367 368 CHECK_PTHREAD_CALL(pthread_key_create, (&tls_key_, NULL), "compiler tls key"); 369 370 dex_to_dex_compiler_ = reinterpret_cast<DexToDexCompilerFn>(ArtCompileDEX); 371 372 compiler_->Init(); 373 374 CHECK(!Runtime::Current()->IsStarted()); 375 if (image_) { 376 CHECK(image_classes_.get() != nullptr); 377 } else { 378 CHECK(image_classes_.get() == nullptr); 379 } 380 381 // Are we generating CFI information? 382 if (compiler_options->GetGenerateGDBInformation()) { 383 cfi_info_.reset(compiler_->GetCallFrameInformationInitialization(*this)); 384 } 385 386 // Read the profile file if one is provided. 387 if (!profile_file.empty()) { 388 profile_present_ = profile_file_.LoadFile(profile_file); 389 if (profile_present_) { 390 LOG(INFO) << "Using profile data form file " << profile_file; 391 } else { 392 LOG(INFO) << "Failed to load profile file " << profile_file; 393 } 394 } 395} 396 397std::vector<uint8_t>* CompilerDriver::DeduplicateCode(const std::vector<uint8_t>& code) { 398 return dedupe_code_.Add(Thread::Current(), code); 399} 400 401std::vector<uint8_t>* CompilerDriver::DeduplicateMappingTable(const std::vector<uint8_t>& code) { 402 return dedupe_mapping_table_.Add(Thread::Current(), code); 403} 404 405std::vector<uint8_t>* CompilerDriver::DeduplicateVMapTable(const std::vector<uint8_t>& code) { 406 return dedupe_vmap_table_.Add(Thread::Current(), code); 407} 408 409std::vector<uint8_t>* CompilerDriver::DeduplicateGCMap(const std::vector<uint8_t>& code) { 410 return dedupe_gc_map_.Add(Thread::Current(), code); 411} 412 413std::vector<uint8_t>* CompilerDriver::DeduplicateCFIInfo(const std::vector<uint8_t>* cfi_info) { 414 if (cfi_info == nullptr) { 415 return nullptr; 416 } 417 return dedupe_cfi_info_.Add(Thread::Current(), *cfi_info); 418} 419 420CompilerDriver::~CompilerDriver() { 421 Thread* self = Thread::Current(); 422 { 423 MutexLock mu(self, compiled_classes_lock_); 424 STLDeleteValues(&compiled_classes_); 425 } 426 { 427 MutexLock mu(self, compiled_methods_lock_); 428 STLDeleteValues(&compiled_methods_); 429 } 430 { 431 MutexLock mu(self, compiled_methods_lock_); 432 STLDeleteElements(&code_to_patch_); 433 } 434 { 435 MutexLock mu(self, compiled_methods_lock_); 436 STLDeleteElements(&methods_to_patch_); 437 } 438 { 439 MutexLock mu(self, compiled_methods_lock_); 440 STLDeleteElements(&classes_to_patch_); 441 } 442 CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key"); 443 compiler_->UnInit(); 444} 445 446CompilerTls* CompilerDriver::GetTls() { 447 // Lazily create thread-local storage 448 CompilerTls* res = static_cast<CompilerTls*>(pthread_getspecific(tls_key_)); 449 if (res == NULL) { 450 res = new CompilerTls(); 451 CHECK_PTHREAD_CALL(pthread_setspecific, (tls_key_, res), "compiler tls"); 452 } 453 return res; 454} 455 456#define CREATE_TRAMPOLINE(type, abi, offset) \ 457 if (Is64BitInstructionSet(instruction_set_)) { \ 458 return CreateTrampoline64(instruction_set_, abi, \ 459 type ## _ENTRYPOINT_OFFSET(8, offset)); \ 460 } else { \ 461 return CreateTrampoline32(instruction_set_, abi, \ 462 type ## _ENTRYPOINT_OFFSET(4, offset)); \ 463 } 464 465const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToInterpreterBridge() const { 466 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToInterpreterBridge) 467} 468 469const std::vector<uint8_t>* CompilerDriver::CreateInterpreterToCompiledCodeBridge() const { 470 CREATE_TRAMPOLINE(INTERPRETER, kInterpreterAbi, pInterpreterToCompiledCodeBridge) 471} 472 473const std::vector<uint8_t>* CompilerDriver::CreateJniDlsymLookup() const { 474 CREATE_TRAMPOLINE(JNI, kJniAbi, pDlsymLookup) 475} 476 477const std::vector<uint8_t>* CompilerDriver::CreatePortableImtConflictTrampoline() const { 478 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableImtConflictTrampoline) 479} 480 481const std::vector<uint8_t>* CompilerDriver::CreatePortableResolutionTrampoline() const { 482 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableResolutionTrampoline) 483} 484 485const std::vector<uint8_t>* CompilerDriver::CreatePortableToInterpreterBridge() const { 486 CREATE_TRAMPOLINE(PORTABLE, kPortableAbi, pPortableToInterpreterBridge) 487} 488 489const std::vector<uint8_t>* CompilerDriver::CreateQuickGenericJniTrampoline() const { 490 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickGenericJniTrampoline) 491} 492 493const std::vector<uint8_t>* CompilerDriver::CreateQuickImtConflictTrampoline() const { 494 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickImtConflictTrampoline) 495} 496 497const std::vector<uint8_t>* CompilerDriver::CreateQuickResolutionTrampoline() const { 498 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickResolutionTrampoline) 499} 500 501const std::vector<uint8_t>* CompilerDriver::CreateQuickToInterpreterBridge() const { 502 CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickToInterpreterBridge) 503} 504#undef CREATE_TRAMPOLINE 505 506void CompilerDriver::CompileAll(jobject class_loader, 507 const std::vector<const DexFile*>& dex_files, 508 TimingLogger* timings) { 509 DCHECK(!Runtime::Current()->IsStarted()); 510 std::unique_ptr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", thread_count_ - 1)); 511 PreCompile(class_loader, dex_files, thread_pool.get(), timings); 512 Compile(class_loader, dex_files, thread_pool.get(), timings); 513 if (dump_stats_) { 514 stats_->Dump(); 515 } 516} 517 518static DexToDexCompilationLevel GetDexToDexCompilationlevel( 519 Thread* self, Handle<mirror::ClassLoader> class_loader, const DexFile& dex_file, 520 const DexFile::ClassDef& class_def) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 521 const char* descriptor = dex_file.GetClassDescriptor(class_def); 522 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 523 mirror::Class* klass = class_linker->FindClass(self, descriptor, class_loader); 524 if (klass == NULL) { 525 CHECK(self->IsExceptionPending()); 526 self->ClearException(); 527 return kDontDexToDexCompile; 528 } 529 // The verifier can only run on "quick" instructions at runtime (see usage of 530 // FindAccessedFieldAtDexPc and FindInvokedMethodAtDexPc in ThrowNullPointerExceptionFromDexPC 531 // function). Since image classes can be verified again while compiling an application, 532 // we must prevent the DEX-to-DEX compiler from introducing them. 533 // TODO: find a way to enable "quick" instructions for image classes and remove this check. 534 bool compiling_image_classes = class_loader.Get() == nullptr; 535 if (compiling_image_classes) { 536 return kRequired; 537 } else if (klass->IsVerified()) { 538 // Class is verified so we can enable DEX-to-DEX compilation for performance. 539 return kOptimize; 540 } else if (klass->IsCompileTimeVerified()) { 541 // Class verification has soft-failed. Anyway, ensure at least correctness. 542 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 543 return kRequired; 544 } else { 545 // Class verification has failed: do not run DEX-to-DEX compilation. 546 return kDontDexToDexCompile; 547 } 548} 549 550void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings) { 551 DCHECK(!Runtime::Current()->IsStarted()); 552 Thread* self = Thread::Current(); 553 jobject jclass_loader; 554 const DexFile* dex_file; 555 uint16_t class_def_idx; 556 uint32_t method_idx = method->GetDexMethodIndex(); 557 uint32_t access_flags = method->GetAccessFlags(); 558 InvokeType invoke_type = method->GetInvokeType(); 559 { 560 ScopedObjectAccessUnchecked soa(self); 561 ScopedLocalRef<jobject> 562 local_class_loader(soa.Env(), 563 soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader())); 564 jclass_loader = soa.Env()->NewGlobalRef(local_class_loader.get()); 565 // Find the dex_file 566 dex_file = method->GetDexFile(); 567 class_def_idx = method->GetClassDefIndex(); 568 } 569 const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset()); 570 self->TransitionFromRunnableToSuspended(kNative); 571 572 std::vector<const DexFile*> dex_files; 573 dex_files.push_back(dex_file); 574 575 std::unique_ptr<ThreadPool> thread_pool(new ThreadPool("Compiler driver thread pool", 0U)); 576 PreCompile(jclass_loader, dex_files, thread_pool.get(), timings); 577 578 // Can we run DEX-to-DEX compiler on this class ? 579 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 580 { 581 ScopedObjectAccess soa(Thread::Current()); 582 const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx); 583 StackHandleScope<1> hs(soa.Self()); 584 Handle<mirror::ClassLoader> class_loader( 585 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 586 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(self, class_loader, *dex_file, 587 class_def); 588 } 589 CompileMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx, jclass_loader, 590 *dex_file, dex_to_dex_compilation_level); 591 592 self->GetJniEnv()->DeleteGlobalRef(jclass_loader); 593 594 self->TransitionFromSuspendedToRunnable(); 595} 596 597void CompilerDriver::Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files, 598 ThreadPool* thread_pool, TimingLogger* timings) { 599 for (size_t i = 0; i != dex_files.size(); ++i) { 600 const DexFile* dex_file = dex_files[i]; 601 CHECK(dex_file != nullptr); 602 ResolveDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 603 } 604} 605 606void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 607 ThreadPool* thread_pool, TimingLogger* timings) { 608 LoadImageClasses(timings); 609 610 if (!compiler_options_->IsVerificationEnabled()) { 611 VLOG(compiler) << "Verify none mode specified, skipping pre-compilation"; 612 return; 613 } 614 615 Resolve(class_loader, dex_files, thread_pool, timings); 616 617 Verify(class_loader, dex_files, thread_pool, timings); 618 619 InitializeClasses(class_loader, dex_files, thread_pool, timings); 620 621 UpdateImageClasses(timings); 622} 623 624bool CompilerDriver::IsImageClass(const char* descriptor) const { 625 if (!IsImage()) { 626 return true; 627 } else { 628 return image_classes_->find(descriptor) != image_classes_->end(); 629 } 630} 631 632static void ResolveExceptionsForMethod(MethodHelper* mh, 633 std::set<std::pair<uint16_t, const DexFile*>>& exceptions_to_resolve) 634 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 635 const DexFile::CodeItem* code_item = mh->GetMethod()->GetCodeItem(); 636 if (code_item == NULL) { 637 return; // native or abstract method 638 } 639 if (code_item->tries_size_ == 0) { 640 return; // nothing to process 641 } 642 const byte* encoded_catch_handler_list = DexFile::GetCatchHandlerData(*code_item, 0); 643 size_t num_encoded_catch_handlers = DecodeUnsignedLeb128(&encoded_catch_handler_list); 644 for (size_t i = 0; i < num_encoded_catch_handlers; i++) { 645 int32_t encoded_catch_handler_size = DecodeSignedLeb128(&encoded_catch_handler_list); 646 bool has_catch_all = false; 647 if (encoded_catch_handler_size <= 0) { 648 encoded_catch_handler_size = -encoded_catch_handler_size; 649 has_catch_all = true; 650 } 651 for (int32_t j = 0; j < encoded_catch_handler_size; j++) { 652 uint16_t encoded_catch_handler_handlers_type_idx = 653 DecodeUnsignedLeb128(&encoded_catch_handler_list); 654 // Add to set of types to resolve if not already in the dex cache resolved types 655 if (!mh->GetMethod()->IsResolvedTypeIdx(encoded_catch_handler_handlers_type_idx)) { 656 exceptions_to_resolve.insert( 657 std::pair<uint16_t, const DexFile*>(encoded_catch_handler_handlers_type_idx, 658 mh->GetMethod()->GetDexFile())); 659 } 660 // ignore address associated with catch handler 661 DecodeUnsignedLeb128(&encoded_catch_handler_list); 662 } 663 if (has_catch_all) { 664 // ignore catch all address 665 DecodeUnsignedLeb128(&encoded_catch_handler_list); 666 } 667 } 668} 669 670static bool ResolveCatchBlockExceptionsClassVisitor(mirror::Class* c, void* arg) 671 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 672 std::set<std::pair<uint16_t, const DexFile*>>* exceptions_to_resolve = 673 reinterpret_cast<std::set<std::pair<uint16_t, const DexFile*>>*>(arg); 674 StackHandleScope<1> hs(Thread::Current()); 675 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 676 for (size_t i = 0; i < c->NumVirtualMethods(); ++i) { 677 mh.ChangeMethod(c->GetVirtualMethod(i)); 678 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 679 } 680 for (size_t i = 0; i < c->NumDirectMethods(); ++i) { 681 mh.ChangeMethod(c->GetDirectMethod(i)); 682 ResolveExceptionsForMethod(&mh, *exceptions_to_resolve); 683 } 684 return true; 685} 686 687static bool RecordImageClassesVisitor(mirror::Class* klass, void* arg) 688 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 689 std::set<std::string>* image_classes = reinterpret_cast<std::set<std::string>*>(arg); 690 std::string temp; 691 image_classes->insert(klass->GetDescriptor(&temp)); 692 return true; 693} 694 695// Make a list of descriptors for classes to include in the image 696void CompilerDriver::LoadImageClasses(TimingLogger* timings) 697 LOCKS_EXCLUDED(Locks::mutator_lock_) { 698 CHECK(timings != nullptr); 699 if (!IsImage()) { 700 return; 701 } 702 703 TimingLogger::ScopedTiming t("LoadImageClasses", timings); 704 // Make a first class to load all classes explicitly listed in the file 705 Thread* self = Thread::Current(); 706 ScopedObjectAccess soa(self); 707 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 708 CHECK(image_classes_.get() != nullptr); 709 for (auto it = image_classes_->begin(), end = image_classes_->end(); it != end;) { 710 const std::string& descriptor(*it); 711 StackHandleScope<1> hs(self); 712 Handle<mirror::Class> klass( 713 hs.NewHandle(class_linker->FindSystemClass(self, descriptor.c_str()))); 714 if (klass.Get() == NULL) { 715 VLOG(compiler) << "Failed to find class " << descriptor; 716 image_classes_->erase(it++); 717 self->ClearException(); 718 } else { 719 ++it; 720 } 721 } 722 723 // Resolve exception classes referenced by the loaded classes. The catch logic assumes 724 // exceptions are resolved by the verifier when there is a catch block in an interested method. 725 // Do this here so that exception classes appear to have been specified image classes. 726 std::set<std::pair<uint16_t, const DexFile*>> unresolved_exception_types; 727 StackHandleScope<1> hs(self); 728 Handle<mirror::Class> java_lang_Throwable( 729 hs.NewHandle(class_linker->FindSystemClass(self, "Ljava/lang/Throwable;"))); 730 do { 731 unresolved_exception_types.clear(); 732 class_linker->VisitClasses(ResolveCatchBlockExceptionsClassVisitor, 733 &unresolved_exception_types); 734 for (const std::pair<uint16_t, const DexFile*>& exception_type : unresolved_exception_types) { 735 uint16_t exception_type_idx = exception_type.first; 736 const DexFile* dex_file = exception_type.second; 737 StackHandleScope<2> hs(self); 738 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(*dex_file))); 739 Handle<mirror::Class> klass(hs.NewHandle( 740 class_linker->ResolveType(*dex_file, exception_type_idx, dex_cache, 741 NullHandle<mirror::ClassLoader>()))); 742 if (klass.Get() == NULL) { 743 const DexFile::TypeId& type_id = dex_file->GetTypeId(exception_type_idx); 744 const char* descriptor = dex_file->GetTypeDescriptor(type_id); 745 LOG(FATAL) << "Failed to resolve class " << descriptor; 746 } 747 DCHECK(java_lang_Throwable->IsAssignableFrom(klass.Get())); 748 } 749 // Resolving exceptions may load classes that reference more exceptions, iterate until no 750 // more are found 751 } while (!unresolved_exception_types.empty()); 752 753 // We walk the roots looking for classes so that we'll pick up the 754 // above classes plus any classes them depend on such super 755 // classes, interfaces, and the required ClassLinker roots. 756 class_linker->VisitClasses(RecordImageClassesVisitor, image_classes_.get()); 757 758 CHECK_NE(image_classes_->size(), 0U); 759} 760 761static void MaybeAddToImageClasses(Handle<mirror::Class> c, std::set<std::string>* image_classes) 762 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 763 Thread* self = Thread::Current(); 764 StackHandleScope<1> hs(self); 765 // Make a copy of the handle so that we don't clobber it doing Assign. 766 Handle<mirror::Class> klass(hs.NewHandle(c.Get())); 767 std::string temp; 768 while (!klass->IsObjectClass()) { 769 const char* descriptor = klass->GetDescriptor(&temp); 770 std::pair<std::set<std::string>::iterator, bool> result = image_classes->insert(descriptor); 771 if (!result.second) { // Previously inserted. 772 break; 773 } 774 VLOG(compiler) << "Adding " << descriptor << " to image classes"; 775 for (size_t i = 0; i < klass->NumDirectInterfaces(); ++i) { 776 StackHandleScope<1> hs(self); 777 MaybeAddToImageClasses(hs.NewHandle(mirror::Class::GetDirectInterface(self, klass, i)), 778 image_classes); 779 } 780 if (klass->IsArrayClass()) { 781 StackHandleScope<1> hs(self); 782 MaybeAddToImageClasses(hs.NewHandle(klass->GetComponentType()), image_classes); 783 } 784 klass.Assign(klass->GetSuperClass()); 785 } 786} 787 788void CompilerDriver::FindClinitImageClassesCallback(mirror::Object* object, void* arg) { 789 DCHECK(object != NULL); 790 DCHECK(arg != NULL); 791 CompilerDriver* compiler_driver = reinterpret_cast<CompilerDriver*>(arg); 792 StackHandleScope<1> hs(Thread::Current()); 793 MaybeAddToImageClasses(hs.NewHandle(object->GetClass()), compiler_driver->image_classes_.get()); 794} 795 796void CompilerDriver::UpdateImageClasses(TimingLogger* timings) { 797 if (IsImage()) { 798 TimingLogger::ScopedTiming t("UpdateImageClasses", timings); 799 // Update image_classes_ with classes for objects created by <clinit> methods. 800 Thread* self = Thread::Current(); 801 const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); 802 gc::Heap* heap = Runtime::Current()->GetHeap(); 803 // TODO: Image spaces only? 804 ScopedObjectAccess soa(Thread::Current()); 805 WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); 806 heap->VisitObjects(FindClinitImageClassesCallback, this); 807 self->EndAssertNoThreadSuspension(old_cause); 808 } 809} 810 811bool CompilerDriver::CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx) { 812 if (IsImage() && 813 IsImageClass(dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_))) { 814 { 815 ScopedObjectAccess soa(Thread::Current()); 816 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 817 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 818 if (resolved_class == nullptr) { 819 // Erroneous class. 820 stats_->TypeNotInDexCache(); 821 return false; 822 } 823 } 824 stats_->TypeInDexCache(); 825 return true; 826 } else { 827 stats_->TypeNotInDexCache(); 828 return false; 829 } 830} 831 832bool CompilerDriver::CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, 833 uint32_t string_idx) { 834 // See also Compiler::ResolveDexFile 835 836 bool result = false; 837 if (IsImage()) { 838 // We resolve all const-string strings when building for the image. 839 ScopedObjectAccess soa(Thread::Current()); 840 StackHandleScope<1> hs(soa.Self()); 841 Handle<mirror::DexCache> dex_cache( 842 hs.NewHandle(Runtime::Current()->GetClassLinker()->FindDexCache(dex_file))); 843 Runtime::Current()->GetClassLinker()->ResolveString(dex_file, string_idx, dex_cache); 844 result = true; 845 } 846 if (result) { 847 stats_->StringInDexCache(); 848 } else { 849 stats_->StringNotInDexCache(); 850 } 851 return result; 852} 853 854bool CompilerDriver::CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file, 855 uint32_t type_idx, 856 bool* type_known_final, bool* type_known_abstract, 857 bool* equals_referrers_class) { 858 if (type_known_final != NULL) { 859 *type_known_final = false; 860 } 861 if (type_known_abstract != NULL) { 862 *type_known_abstract = false; 863 } 864 if (equals_referrers_class != NULL) { 865 *equals_referrers_class = false; 866 } 867 ScopedObjectAccess soa(Thread::Current()); 868 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 869 // Get type from dex cache assuming it was populated by the verifier 870 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 871 if (resolved_class == NULL) { 872 stats_->TypeNeedsAccessCheck(); 873 return false; // Unknown class needs access checks. 874 } 875 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 876 if (equals_referrers_class != NULL) { 877 *equals_referrers_class = (method_id.class_idx_ == type_idx); 878 } 879 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 880 if (referrer_class == NULL) { 881 stats_->TypeNeedsAccessCheck(); 882 return false; // Incomplete referrer knowledge needs access check. 883 } 884 // Perform access check, will return true if access is ok or false if we're going to have to 885 // check this at runtime (for example for class loaders). 886 bool result = referrer_class->CanAccess(resolved_class); 887 if (result) { 888 stats_->TypeDoesntNeedAccessCheck(); 889 if (type_known_final != NULL) { 890 *type_known_final = resolved_class->IsFinal() && !resolved_class->IsArrayClass(); 891 } 892 if (type_known_abstract != NULL) { 893 *type_known_abstract = resolved_class->IsAbstract() && !resolved_class->IsArrayClass(); 894 } 895 } else { 896 stats_->TypeNeedsAccessCheck(); 897 } 898 return result; 899} 900 901bool CompilerDriver::CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, 902 const DexFile& dex_file, 903 uint32_t type_idx) { 904 ScopedObjectAccess soa(Thread::Current()); 905 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 906 // Get type from dex cache assuming it was populated by the verifier. 907 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 908 if (resolved_class == NULL) { 909 stats_->TypeNeedsAccessCheck(); 910 return false; // Unknown class needs access checks. 911 } 912 const DexFile::MethodId& method_id = dex_file.GetMethodId(referrer_idx); 913 mirror::Class* referrer_class = dex_cache->GetResolvedType(method_id.class_idx_); 914 if (referrer_class == NULL) { 915 stats_->TypeNeedsAccessCheck(); 916 return false; // Incomplete referrer knowledge needs access check. 917 } 918 // Perform access and instantiable checks, will return true if access is ok or false if we're 919 // going to have to check this at runtime (for example for class loaders). 920 bool result = referrer_class->CanAccess(resolved_class) && resolved_class->IsInstantiable(); 921 if (result) { 922 stats_->TypeDoesntNeedAccessCheck(); 923 } else { 924 stats_->TypeNeedsAccessCheck(); 925 } 926 return result; 927} 928 929bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx, 930 bool* is_type_initialized, bool* use_direct_type_ptr, 931 uintptr_t* direct_type_ptr, bool* out_is_finalizable) { 932 ScopedObjectAccess soa(Thread::Current()); 933 mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file); 934 mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx); 935 if (resolved_class == nullptr) { 936 return false; 937 } 938 *out_is_finalizable = resolved_class->IsFinalizable(); 939 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 940 const bool support_boot_image_fixup = GetSupportBootImageFixup(); 941 if (compiling_boot) { 942 // boot -> boot class pointers. 943 // True if the class is in the image at boot compiling time. 944 const bool is_image_class = IsImage() && IsImageClass( 945 dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_)); 946 // True if pc relative load works. 947 if (is_image_class && support_boot_image_fixup) { 948 *is_type_initialized = resolved_class->IsInitialized(); 949 *use_direct_type_ptr = false; 950 *direct_type_ptr = 0; 951 return true; 952 } else { 953 return false; 954 } 955 } else { 956 // True if the class is in the image at app compiling time. 957 const bool class_in_image = 958 Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace(); 959 if (class_in_image && support_boot_image_fixup) { 960 // boot -> app class pointers. 961 *is_type_initialized = resolved_class->IsInitialized(); 962 // TODO This is somewhat hacky. We should refactor all of this invoke codepath. 963 *use_direct_type_ptr = !GetCompilerOptions().GetIncludePatchInformation(); 964 *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class); 965 return true; 966 } else { 967 // app -> app class pointers. 968 // Give up because app does not have an image and class 969 // isn't created at compile time. TODO: implement this 970 // if/when each app gets an image. 971 return false; 972 } 973 } 974} 975 976void CompilerDriver::ProcessedInstanceField(bool resolved) { 977 if (!resolved) { 978 stats_->UnresolvedInstanceField(); 979 } else { 980 stats_->ResolvedInstanceField(); 981 } 982} 983 984void CompilerDriver::ProcessedStaticField(bool resolved, bool local) { 985 if (!resolved) { 986 stats_->UnresolvedStaticField(); 987 } else if (local) { 988 stats_->ResolvedLocalStaticField(); 989 } else { 990 stats_->ResolvedStaticField(); 991 } 992} 993 994void CompilerDriver::ProcessedInvoke(InvokeType invoke_type, int flags) { 995 stats_->ProcessedInvoke(invoke_type, flags); 996} 997 998mirror::ArtField* CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, 999 const DexCompilationUnit* mUnit, 1000 bool is_put, 1001 const ScopedObjectAccess& soa) { 1002 // Try to resolve the field and compiling method's class. 1003 mirror::ArtField* resolved_field; 1004 mirror::Class* referrer_class; 1005 mirror::DexCache* dex_cache; 1006 { 1007 StackHandleScope<3> hs(soa.Self()); 1008 Handle<mirror::DexCache> dex_cache_handle( 1009 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1010 Handle<mirror::ClassLoader> class_loader_handle( 1011 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1012 Handle<mirror::ArtField> resolved_field_handle(hs.NewHandle( 1013 ResolveField(soa, dex_cache_handle, class_loader_handle, mUnit, field_idx, false))); 1014 referrer_class = (resolved_field_handle.Get() != nullptr) 1015 ? ResolveCompilingMethodsClass(soa, dex_cache_handle, class_loader_handle, mUnit) : nullptr; 1016 resolved_field = resolved_field_handle.Get(); 1017 dex_cache = dex_cache_handle.Get(); 1018 } 1019 bool can_link = false; 1020 if (resolved_field != nullptr && referrer_class != nullptr) { 1021 std::pair<bool, bool> fast_path = IsFastInstanceField( 1022 dex_cache, referrer_class, resolved_field, field_idx); 1023 can_link = is_put ? fast_path.second : fast_path.first; 1024 } 1025 ProcessedInstanceField(can_link); 1026 return can_link ? resolved_field : nullptr; 1027} 1028 1029bool CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 1030 bool is_put, MemberOffset* field_offset, 1031 bool* is_volatile) { 1032 ScopedObjectAccess soa(Thread::Current()); 1033 StackHandleScope<1> hs(soa.Self()); 1034 Handle<mirror::ArtField> resolved_field = 1035 hs.NewHandle(ComputeInstanceFieldInfo(field_idx, mUnit, is_put, soa)); 1036 1037 if (resolved_field.Get() == nullptr) { 1038 // Conservative defaults. 1039 *is_volatile = true; 1040 *field_offset = MemberOffset(static_cast<size_t>(-1)); 1041 return false; 1042 } else { 1043 *is_volatile = resolved_field->IsVolatile(); 1044 *field_offset = resolved_field->GetOffset(); 1045 return true; 1046 } 1047} 1048 1049bool CompilerDriver::ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, 1050 bool is_put, MemberOffset* field_offset, 1051 uint32_t* storage_index, bool* is_referrers_class, 1052 bool* is_volatile, bool* is_initialized) { 1053 ScopedObjectAccess soa(Thread::Current()); 1054 // Try to resolve the field and compiling method's class. 1055 mirror::ArtField* resolved_field; 1056 mirror::Class* referrer_class; 1057 mirror::DexCache* dex_cache; 1058 { 1059 StackHandleScope<3> hs(soa.Self()); 1060 Handle<mirror::DexCache> dex_cache_handle( 1061 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1062 Handle<mirror::ClassLoader> class_loader_handle( 1063 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1064 Handle<mirror::ArtField> resolved_field_handle(hs.NewHandle( 1065 ResolveField(soa, dex_cache_handle, class_loader_handle, mUnit, field_idx, true))); 1066 referrer_class = (resolved_field_handle.Get() != nullptr) 1067 ? ResolveCompilingMethodsClass(soa, dex_cache_handle, class_loader_handle, mUnit) : nullptr; 1068 resolved_field = resolved_field_handle.Get(); 1069 dex_cache = dex_cache_handle.Get(); 1070 } 1071 bool result = false; 1072 if (resolved_field != nullptr && referrer_class != nullptr) { 1073 *is_volatile = IsFieldVolatile(resolved_field); 1074 std::pair<bool, bool> fast_path = IsFastStaticField( 1075 dex_cache, referrer_class, resolved_field, field_idx, field_offset, 1076 storage_index, is_referrers_class, is_initialized); 1077 result = is_put ? fast_path.second : fast_path.first; 1078 } 1079 if (!result) { 1080 // Conservative defaults. 1081 *is_volatile = true; 1082 *field_offset = MemberOffset(static_cast<size_t>(-1)); 1083 *storage_index = -1; 1084 *is_referrers_class = false; 1085 *is_initialized = false; 1086 } 1087 ProcessedStaticField(result, *is_referrers_class); 1088 return result; 1089} 1090 1091void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type, 1092 bool no_guarantee_of_dex_cache_entry, 1093 mirror::Class* referrer_class, 1094 mirror::ArtMethod* method, 1095 int* stats_flags, 1096 MethodReference* target_method, 1097 uintptr_t* direct_code, 1098 uintptr_t* direct_method) { 1099 // For direct and static methods compute possible direct_code and direct_method values, ie 1100 // an address for the Method* being invoked and an address of the code for that Method*. 1101 // For interface calls compute a value for direct_method that is the interface method being 1102 // invoked, so this can be passed to the out-of-line runtime support code. 1103 *direct_code = 0; 1104 *direct_method = 0; 1105 bool use_dex_cache = false; 1106 const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot(); 1107 // TODO This is somewhat hacky. We should refactor all of this invoke codepath. 1108 const bool force_relocations = (compiling_boot || 1109 GetCompilerOptions().GetIncludePatchInformation()); 1110 if (compiler_->IsPortable()) { 1111 if (sharp_type != kStatic && sharp_type != kDirect) { 1112 return; 1113 } 1114 use_dex_cache = true; 1115 } else { 1116 if (sharp_type != kStatic && sharp_type != kDirect) { 1117 return; 1118 } 1119 // TODO: support patching on all architectures. 1120 use_dex_cache = force_relocations && !support_boot_image_fixup_; 1121 } 1122 bool method_code_in_boot = (method->GetDeclaringClass()->GetClassLoader() == nullptr); 1123 if (!use_dex_cache) { 1124 if (!method_code_in_boot) { 1125 use_dex_cache = true; 1126 } else { 1127 bool has_clinit_trampoline = 1128 method->IsStatic() && !method->GetDeclaringClass()->IsInitialized(); 1129 if (has_clinit_trampoline && (method->GetDeclaringClass() != referrer_class)) { 1130 // Ensure we run the clinit trampoline unless we are invoking a static method in the same 1131 // class. 1132 use_dex_cache = true; 1133 } 1134 } 1135 } 1136 if (method_code_in_boot) { 1137 *stats_flags |= kFlagDirectCallToBoot | kFlagDirectMethodToBoot; 1138 } 1139 if (!use_dex_cache && force_relocations) { 1140 if (!IsImage() || !IsImageClass(method->GetDeclaringClassDescriptor())) { 1141 // We can only branch directly to Methods that are resolved in the DexCache. 1142 // Otherwise we won't invoke the resolution trampoline. 1143 use_dex_cache = true; 1144 } 1145 } 1146 // The method is defined not within this dex file. We need a dex cache slot within the current 1147 // dex file or direct pointers. 1148 bool must_use_direct_pointers = false; 1149 if (target_method->dex_file == method->GetDeclaringClass()->GetDexCache()->GetDexFile()) { 1150 target_method->dex_method_index = method->GetDexMethodIndex(); 1151 } else { 1152 if (no_guarantee_of_dex_cache_entry) { 1153 StackHandleScope<1> hs(Thread::Current()); 1154 MethodHelper mh(hs.NewHandle(method)); 1155 // See if the method is also declared in this dex cache. 1156 uint32_t dex_method_idx = mh.FindDexMethodIndexInOtherDexFile( 1157 *target_method->dex_file, target_method->dex_method_index); 1158 if (dex_method_idx != DexFile::kDexNoIndex) { 1159 target_method->dex_method_index = dex_method_idx; 1160 } else { 1161 if (force_relocations && !use_dex_cache) { 1162 target_method->dex_method_index = method->GetDexMethodIndex(); 1163 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1164 } 1165 must_use_direct_pointers = true; 1166 } 1167 } 1168 } 1169 if (use_dex_cache) { 1170 if (must_use_direct_pointers) { 1171 // Fail. Test above showed the only safe dispatch was via the dex cache, however, the direct 1172 // pointers are required as the dex cache lacks an appropriate entry. 1173 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1174 } else { 1175 *type = sharp_type; 1176 } 1177 } else { 1178 bool method_in_image = 1179 Runtime::Current()->GetHeap()->FindSpaceFromObject(method, false)->IsImageSpace(); 1180 if (method_in_image || compiling_boot) { 1181 // We know we must be able to get to the method in the image, so use that pointer. 1182 CHECK(!method->IsAbstract()); 1183 *type = sharp_type; 1184 *direct_method = force_relocations ? -1 : reinterpret_cast<uintptr_t>(method); 1185 *direct_code = force_relocations ? -1 : compiler_->GetEntryPointOf(method); 1186 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1187 target_method->dex_method_index = method->GetDexMethodIndex(); 1188 } else if (!must_use_direct_pointers) { 1189 // Set the code and rely on the dex cache for the method. 1190 *type = sharp_type; 1191 if (force_relocations) { 1192 *direct_code = -1; 1193 target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1194 target_method->dex_method_index = method->GetDexMethodIndex(); 1195 } else { 1196 *direct_code = compiler_->GetEntryPointOf(method); 1197 } 1198 } else { 1199 // Direct pointers were required but none were available. 1200 VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method); 1201 } 1202 } 1203} 1204 1205bool CompilerDriver::ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc, 1206 bool update_stats, bool enable_devirtualization, 1207 InvokeType* invoke_type, MethodReference* target_method, 1208 int* vtable_idx, uintptr_t* direct_code, 1209 uintptr_t* direct_method) { 1210 InvokeType orig_invoke_type = *invoke_type; 1211 int stats_flags = 0; 1212 ScopedObjectAccess soa(Thread::Current()); 1213 // Try to resolve the method and compiling method's class. 1214 mirror::ArtMethod* resolved_method; 1215 mirror::Class* referrer_class; 1216 StackHandleScope<3> hs(soa.Self()); 1217 Handle<mirror::DexCache> dex_cache( 1218 hs.NewHandle(mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()))); 1219 Handle<mirror::ClassLoader> class_loader(hs.NewHandle( 1220 soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()))); 1221 { 1222 uint32_t method_idx = target_method->dex_method_index; 1223 Handle<mirror::ArtMethod> resolved_method_handle(hs.NewHandle( 1224 ResolveMethod(soa, dex_cache, class_loader, mUnit, method_idx, orig_invoke_type))); 1225 referrer_class = (resolved_method_handle.Get() != nullptr) 1226 ? ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit) : nullptr; 1227 resolved_method = resolved_method_handle.Get(); 1228 } 1229 bool result = false; 1230 if (resolved_method != nullptr) { 1231 *vtable_idx = GetResolvedMethodVTableIndex(resolved_method, orig_invoke_type); 1232 1233 if (enable_devirtualization) { 1234 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1235 const MethodReference* devirt_target = mUnit->GetVerifiedMethod()->GetDevirtTarget(dex_pc); 1236 1237 stats_flags = IsFastInvoke( 1238 soa, dex_cache, class_loader, mUnit, referrer_class, resolved_method, 1239 invoke_type, target_method, devirt_target, direct_code, direct_method); 1240 result = stats_flags != 0; 1241 } else { 1242 // Devirtualization not enabled. Inline IsFastInvoke(), dropping the devirtualization parts. 1243 if (UNLIKELY(referrer_class == nullptr) || 1244 UNLIKELY(!referrer_class->CanAccessResolvedMethod(resolved_method->GetDeclaringClass(), 1245 resolved_method, dex_cache.Get(), 1246 target_method->dex_method_index)) || 1247 *invoke_type == kSuper) { 1248 // Slow path. (Without devirtualization, all super calls go slow path as well.) 1249 } else { 1250 // Sharpening failed so generate a regular resolved method dispatch. 1251 stats_flags = kFlagMethodResolved; 1252 GetCodeAndMethodForDirectCall(invoke_type, *invoke_type, false, referrer_class, resolved_method, 1253 &stats_flags, target_method, direct_code, direct_method); 1254 result = true; 1255 } 1256 } 1257 } 1258 if (!result) { 1259 // Conservative defaults. 1260 *vtable_idx = -1; 1261 *direct_code = 0u; 1262 *direct_method = 0u; 1263 } 1264 if (update_stats) { 1265 ProcessedInvoke(orig_invoke_type, stats_flags); 1266 } 1267 return result; 1268} 1269 1270const VerifiedMethod* CompilerDriver::GetVerifiedMethod(const DexFile* dex_file, 1271 uint32_t method_idx) const { 1272 MethodReference ref(dex_file, method_idx); 1273 return verification_results_->GetVerifiedMethod(ref); 1274} 1275 1276bool CompilerDriver::IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc) { 1277 DCHECK(mUnit->GetVerifiedMethod() != nullptr); 1278 bool result = mUnit->GetVerifiedMethod()->IsSafeCast(dex_pc); 1279 if (result) { 1280 stats_->SafeCast(); 1281 } else { 1282 stats_->NotASafeCast(); 1283 } 1284 return result; 1285} 1286 1287void CompilerDriver::AddCodePatch(const DexFile* dex_file, 1288 uint16_t referrer_class_def_idx, 1289 uint32_t referrer_method_idx, 1290 InvokeType referrer_invoke_type, 1291 uint32_t target_method_idx, 1292 const DexFile* target_dex_file, 1293 InvokeType target_invoke_type, 1294 size_t literal_offset) { 1295 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1296 code_to_patch_.push_back(new CallPatchInformation(dex_file, 1297 referrer_class_def_idx, 1298 referrer_method_idx, 1299 referrer_invoke_type, 1300 target_method_idx, 1301 target_dex_file, 1302 target_invoke_type, 1303 literal_offset)); 1304} 1305void CompilerDriver::AddRelativeCodePatch(const DexFile* dex_file, 1306 uint16_t referrer_class_def_idx, 1307 uint32_t referrer_method_idx, 1308 InvokeType referrer_invoke_type, 1309 uint32_t target_method_idx, 1310 const DexFile* target_dex_file, 1311 InvokeType target_invoke_type, 1312 size_t literal_offset, 1313 int32_t pc_relative_offset) { 1314 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1315 code_to_patch_.push_back(new RelativeCallPatchInformation(dex_file, 1316 referrer_class_def_idx, 1317 referrer_method_idx, 1318 referrer_invoke_type, 1319 target_method_idx, 1320 target_dex_file, 1321 target_invoke_type, 1322 literal_offset, 1323 pc_relative_offset)); 1324} 1325void CompilerDriver::AddMethodPatch(const DexFile* dex_file, 1326 uint16_t referrer_class_def_idx, 1327 uint32_t referrer_method_idx, 1328 InvokeType referrer_invoke_type, 1329 uint32_t target_method_idx, 1330 const DexFile* target_dex_file, 1331 InvokeType target_invoke_type, 1332 size_t literal_offset) { 1333 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1334 methods_to_patch_.push_back(new CallPatchInformation(dex_file, 1335 referrer_class_def_idx, 1336 referrer_method_idx, 1337 referrer_invoke_type, 1338 target_method_idx, 1339 target_dex_file, 1340 target_invoke_type, 1341 literal_offset)); 1342} 1343void CompilerDriver::AddClassPatch(const DexFile* dex_file, 1344 uint16_t referrer_class_def_idx, 1345 uint32_t referrer_method_idx, 1346 uint32_t target_type_idx, 1347 size_t literal_offset) { 1348 MutexLock mu(Thread::Current(), compiled_methods_lock_); 1349 classes_to_patch_.push_back(new TypePatchInformation(dex_file, 1350 referrer_class_def_idx, 1351 referrer_method_idx, 1352 target_type_idx, 1353 literal_offset)); 1354} 1355 1356class ParallelCompilationManager { 1357 public: 1358 typedef void Callback(const ParallelCompilationManager* manager, size_t index); 1359 1360 ParallelCompilationManager(ClassLinker* class_linker, 1361 jobject class_loader, 1362 CompilerDriver* compiler, 1363 const DexFile* dex_file, 1364 const std::vector<const DexFile*>& dex_files, 1365 ThreadPool* thread_pool) 1366 : index_(0), 1367 class_linker_(class_linker), 1368 class_loader_(class_loader), 1369 compiler_(compiler), 1370 dex_file_(dex_file), 1371 dex_files_(dex_files), 1372 thread_pool_(thread_pool) {} 1373 1374 ClassLinker* GetClassLinker() const { 1375 CHECK(class_linker_ != NULL); 1376 return class_linker_; 1377 } 1378 1379 jobject GetClassLoader() const { 1380 return class_loader_; 1381 } 1382 1383 CompilerDriver* GetCompiler() const { 1384 CHECK(compiler_ != NULL); 1385 return compiler_; 1386 } 1387 1388 const DexFile* GetDexFile() const { 1389 CHECK(dex_file_ != NULL); 1390 return dex_file_; 1391 } 1392 1393 const std::vector<const DexFile*>& GetDexFiles() const { 1394 return dex_files_; 1395 } 1396 1397 void ForAll(size_t begin, size_t end, Callback callback, size_t work_units) { 1398 Thread* self = Thread::Current(); 1399 self->AssertNoPendingException(); 1400 CHECK_GT(work_units, 0U); 1401 1402 index_.StoreRelaxed(begin); 1403 for (size_t i = 0; i < work_units; ++i) { 1404 thread_pool_->AddTask(self, new ForAllClosure(this, end, callback)); 1405 } 1406 thread_pool_->StartWorkers(self); 1407 1408 // Ensure we're suspended while we're blocked waiting for the other threads to finish (worker 1409 // thread destructor's called below perform join). 1410 CHECK_NE(self->GetState(), kRunnable); 1411 1412 // Wait for all the worker threads to finish. 1413 thread_pool_->Wait(self, true, false); 1414 } 1415 1416 size_t NextIndex() { 1417 return index_.FetchAndAddSequentiallyConsistent(1); 1418 } 1419 1420 private: 1421 class ForAllClosure : public Task { 1422 public: 1423 ForAllClosure(ParallelCompilationManager* manager, size_t end, Callback* callback) 1424 : manager_(manager), 1425 end_(end), 1426 callback_(callback) {} 1427 1428 virtual void Run(Thread* self) { 1429 while (true) { 1430 const size_t index = manager_->NextIndex(); 1431 if (UNLIKELY(index >= end_)) { 1432 break; 1433 } 1434 callback_(manager_, index); 1435 self->AssertNoPendingException(); 1436 } 1437 } 1438 1439 virtual void Finalize() { 1440 delete this; 1441 } 1442 1443 private: 1444 ParallelCompilationManager* const manager_; 1445 const size_t end_; 1446 Callback* const callback_; 1447 }; 1448 1449 AtomicInteger index_; 1450 ClassLinker* const class_linker_; 1451 const jobject class_loader_; 1452 CompilerDriver* const compiler_; 1453 const DexFile* const dex_file_; 1454 const std::vector<const DexFile*>& dex_files_; 1455 ThreadPool* const thread_pool_; 1456 1457 DISALLOW_COPY_AND_ASSIGN(ParallelCompilationManager); 1458}; 1459 1460static bool SkipClassCheckClassPath(const char* descriptor, const DexFile& dex_file, 1461 const std::vector<const DexFile*>& classpath) { 1462 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, classpath); 1463 CHECK(pair.second != NULL); 1464 if (pair.first != &dex_file) { 1465 LOG(WARNING) << "Skipping class " << descriptor << " from " << dex_file.GetLocation() 1466 << " previously found in " << pair.first->GetLocation(); 1467 return true; 1468 } 1469 return false; 1470} 1471 1472// Return true if the class should be skipped during compilation. 1473// 1474// The first case where we skip is for redundant class definitions in 1475// the boot classpath. We skip all but the first definition in that case. 1476// 1477// The second case where we skip is when an app bundles classes found 1478// in the boot classpath. Since at runtime we will select the class from 1479// the boot classpath, we ignore the one from the app. 1480// 1481// The third case is if the app itself has the class defined in multiple dex files. Then we skip 1482// it if it is not the first occurrence. 1483static bool SkipClass(ClassLinker* class_linker, jobject class_loader, const DexFile& dex_file, 1484 const std::vector<const DexFile*>& dex_files, 1485 const DexFile::ClassDef& class_def) { 1486 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1487 1488 if (class_loader == NULL) { 1489 return SkipClassCheckClassPath(descriptor, dex_file, class_linker->GetBootClassPath()); 1490 } 1491 1492 if (class_linker->IsInBootClassPath(descriptor)) { 1493 return true; 1494 } 1495 1496 if (dex_files.size() > 1) { 1497 // Multi-dex compilation, only take first class. 1498 return SkipClassCheckClassPath(descriptor, dex_file, dex_files); 1499 } else { 1500 // Single dex, take everything. 1501 return false; 1502 } 1503} 1504 1505// A fast version of SkipClass above if the class pointer is available 1506// that avoids the expensive FindInClassPath search. 1507static bool SkipClass(jobject class_loader, const DexFile& dex_file, mirror::Class* klass) 1508 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1509 DCHECK(klass != NULL); 1510 const DexFile& original_dex_file = *klass->GetDexCache()->GetDexFile(); 1511 if (&dex_file != &original_dex_file) { 1512 if (class_loader == NULL) { 1513 LOG(WARNING) << "Skipping class " << PrettyDescriptor(klass) << " from " 1514 << dex_file.GetLocation() << " previously found in " 1515 << original_dex_file.GetLocation(); 1516 } 1517 return true; 1518 } 1519 return false; 1520} 1521 1522static void CheckAndClearResolveException(Thread* self) 1523 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1524 CHECK(self->IsExceptionPending()); 1525 mirror::Throwable* exception = self->GetException(nullptr); 1526 std::string temp; 1527 const char* descriptor = exception->GetClass()->GetDescriptor(&temp); 1528 const char* expected_exceptions[] = { 1529 "Ljava/lang/IllegalAccessError;", 1530 "Ljava/lang/IncompatibleClassChangeError;", 1531 "Ljava/lang/InstantiationError;", 1532 "Ljava/lang/LinkageError;", 1533 "Ljava/lang/NoClassDefFoundError;", 1534 "Ljava/lang/NoSuchFieldError;", 1535 "Ljava/lang/NoSuchMethodError;" 1536 }; 1537 bool found = false; 1538 for (size_t i = 0; (found == false) && (i < arraysize(expected_exceptions)); ++i) { 1539 if (strcmp(descriptor, expected_exceptions[i]) == 0) { 1540 found = true; 1541 } 1542 } 1543 if (!found) { 1544 LOG(FATAL) << "Unexpected exception " << exception->Dump(); 1545 } 1546 self->ClearException(); 1547} 1548 1549static void ResolveClassFieldsAndMethods(const ParallelCompilationManager* manager, 1550 size_t class_def_index) 1551 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1552 ATRACE_CALL(); 1553 Thread* self = Thread::Current(); 1554 jobject jclass_loader = manager->GetClassLoader(); 1555 const DexFile& dex_file = *manager->GetDexFile(); 1556 ClassLinker* class_linker = manager->GetClassLinker(); 1557 1558 // If an instance field is final then we need to have a barrier on the return, static final 1559 // fields are assigned within the lock held for class initialization. Conservatively assume 1560 // constructor barriers are always required. 1561 bool requires_constructor_barrier = true; 1562 1563 // Method and Field are the worst. We can't resolve without either 1564 // context from the code use (to disambiguate virtual vs direct 1565 // method and instance vs static field) or from class 1566 // definitions. While the compiler will resolve what it can as it 1567 // needs it, here we try to resolve fields and methods used in class 1568 // definitions, since many of them many never be referenced by 1569 // generated code. 1570 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1571 if (!SkipClass(class_linker, jclass_loader, dex_file, manager->GetDexFiles(), class_def)) { 1572 ScopedObjectAccess soa(self); 1573 StackHandleScope<2> hs(soa.Self()); 1574 Handle<mirror::ClassLoader> class_loader( 1575 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1576 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1577 // Resolve the class. 1578 mirror::Class* klass = class_linker->ResolveType(dex_file, class_def.class_idx_, dex_cache, 1579 class_loader); 1580 bool resolve_fields_and_methods; 1581 if (klass == NULL) { 1582 // Class couldn't be resolved, for example, super-class is in a different dex file. Don't 1583 // attempt to resolve methods and fields when there is no declaring class. 1584 CheckAndClearResolveException(soa.Self()); 1585 resolve_fields_and_methods = false; 1586 } else { 1587 resolve_fields_and_methods = manager->GetCompiler()->IsImage(); 1588 } 1589 // Note the class_data pointer advances through the headers, 1590 // static fields, instance fields, direct methods, and virtual 1591 // methods. 1592 const byte* class_data = dex_file.GetClassData(class_def); 1593 if (class_data == NULL) { 1594 // Empty class such as a marker interface. 1595 requires_constructor_barrier = false; 1596 } else { 1597 ClassDataItemIterator it(dex_file, class_data); 1598 while (it.HasNextStaticField()) { 1599 if (resolve_fields_and_methods) { 1600 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1601 dex_cache, class_loader, true); 1602 if (field == NULL) { 1603 CheckAndClearResolveException(soa.Self()); 1604 } 1605 } 1606 it.Next(); 1607 } 1608 // We require a constructor barrier if there are final instance fields. 1609 requires_constructor_barrier = false; 1610 while (it.HasNextInstanceField()) { 1611 if ((it.GetMemberAccessFlags() & kAccFinal) != 0) { 1612 requires_constructor_barrier = true; 1613 } 1614 if (resolve_fields_and_methods) { 1615 mirror::ArtField* field = class_linker->ResolveField(dex_file, it.GetMemberIndex(), 1616 dex_cache, class_loader, false); 1617 if (field == NULL) { 1618 CheckAndClearResolveException(soa.Self()); 1619 } 1620 } 1621 it.Next(); 1622 } 1623 if (resolve_fields_and_methods) { 1624 while (it.HasNextDirectMethod()) { 1625 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1626 dex_cache, class_loader, 1627 NullHandle<mirror::ArtMethod>(), 1628 it.GetMethodInvokeType(class_def)); 1629 if (method == NULL) { 1630 CheckAndClearResolveException(soa.Self()); 1631 } 1632 it.Next(); 1633 } 1634 while (it.HasNextVirtualMethod()) { 1635 mirror::ArtMethod* method = class_linker->ResolveMethod(dex_file, it.GetMemberIndex(), 1636 dex_cache, class_loader, 1637 NullHandle<mirror::ArtMethod>(), 1638 it.GetMethodInvokeType(class_def)); 1639 if (method == NULL) { 1640 CheckAndClearResolveException(soa.Self()); 1641 } 1642 it.Next(); 1643 } 1644 DCHECK(!it.HasNext()); 1645 } 1646 } 1647 } 1648 if (requires_constructor_barrier) { 1649 manager->GetCompiler()->AddRequiresConstructorBarrier(self, &dex_file, class_def_index); 1650 } 1651} 1652 1653static void ResolveType(const ParallelCompilationManager* manager, size_t type_idx) 1654 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1655 // Class derived values are more complicated, they require the linker and loader. 1656 ScopedObjectAccess soa(Thread::Current()); 1657 ClassLinker* class_linker = manager->GetClassLinker(); 1658 const DexFile& dex_file = *manager->GetDexFile(); 1659 StackHandleScope<2> hs(soa.Self()); 1660 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1661 Handle<mirror::ClassLoader> class_loader( 1662 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(manager->GetClassLoader()))); 1663 mirror::Class* klass = class_linker->ResolveType(dex_file, type_idx, dex_cache, class_loader); 1664 1665 if (klass == NULL) { 1666 CHECK(soa.Self()->IsExceptionPending()); 1667 mirror::Throwable* exception = soa.Self()->GetException(NULL); 1668 VLOG(compiler) << "Exception during type resolution: " << exception->Dump(); 1669 if (exception->GetClass()->DescriptorEquals("Ljava/lang/OutOfMemoryError;")) { 1670 // There's little point continuing compilation if the heap is exhausted. 1671 LOG(FATAL) << "Out of memory during type resolution for compilation"; 1672 } 1673 soa.Self()->ClearException(); 1674 } 1675} 1676 1677void CompilerDriver::ResolveDexFile(jobject class_loader, const DexFile& dex_file, 1678 const std::vector<const DexFile*>& dex_files, 1679 ThreadPool* thread_pool, TimingLogger* timings) { 1680 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1681 1682 // TODO: we could resolve strings here, although the string table is largely filled with class 1683 // and method names. 1684 1685 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, dex_files, 1686 thread_pool); 1687 if (IsImage()) { 1688 // For images we resolve all types, such as array, whereas for applications just those with 1689 // classdefs are resolved by ResolveClassFieldsAndMethods. 1690 TimingLogger::ScopedTiming t("Resolve Types", timings); 1691 context.ForAll(0, dex_file.NumTypeIds(), ResolveType, thread_count_); 1692 } 1693 1694 TimingLogger::ScopedTiming t("Resolve MethodsAndFields", timings); 1695 context.ForAll(0, dex_file.NumClassDefs(), ResolveClassFieldsAndMethods, thread_count_); 1696} 1697 1698void CompilerDriver::Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1699 ThreadPool* thread_pool, TimingLogger* timings) { 1700 for (size_t i = 0; i != dex_files.size(); ++i) { 1701 const DexFile* dex_file = dex_files[i]; 1702 CHECK(dex_file != NULL); 1703 VerifyDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 1704 } 1705} 1706 1707static void VerifyClass(const ParallelCompilationManager* manager, size_t class_def_index) 1708 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1709 ATRACE_CALL(); 1710 ScopedObjectAccess soa(Thread::Current()); 1711 const DexFile& dex_file = *manager->GetDexFile(); 1712 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1713 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1714 ClassLinker* class_linker = manager->GetClassLinker(); 1715 jobject jclass_loader = manager->GetClassLoader(); 1716 StackHandleScope<3> hs(soa.Self()); 1717 Handle<mirror::ClassLoader> class_loader( 1718 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1719 Handle<mirror::Class> klass( 1720 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor, class_loader))); 1721 if (klass.Get() == nullptr) { 1722 CHECK(soa.Self()->IsExceptionPending()); 1723 soa.Self()->ClearException(); 1724 1725 /* 1726 * At compile time, we can still structurally verify the class even if FindClass fails. 1727 * This is to ensure the class is structurally sound for compilation. An unsound class 1728 * will be rejected by the verifier and later skipped during compilation in the compiler. 1729 */ 1730 Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file))); 1731 std::string error_msg; 1732 if (verifier::MethodVerifier::VerifyClass(&dex_file, dex_cache, class_loader, &class_def, true, 1733 &error_msg) == 1734 verifier::MethodVerifier::kHardFailure) { 1735 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(descriptor) 1736 << " because: " << error_msg; 1737 } 1738 } else if (!SkipClass(jclass_loader, dex_file, klass.Get())) { 1739 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()); 1740 class_linker->VerifyClass(klass); 1741 1742 if (klass->IsErroneous()) { 1743 // ClassLinker::VerifyClass throws, which isn't useful in the compiler. 1744 CHECK(soa.Self()->IsExceptionPending()); 1745 soa.Self()->ClearException(); 1746 } 1747 1748 CHECK(klass->IsCompileTimeVerified() || klass->IsErroneous()) 1749 << PrettyDescriptor(klass.Get()) << ": state=" << klass->GetStatus(); 1750 } 1751 soa.Self()->AssertNoPendingException(); 1752} 1753 1754void CompilerDriver::VerifyDexFile(jobject class_loader, const DexFile& dex_file, 1755 const std::vector<const DexFile*>& dex_files, 1756 ThreadPool* thread_pool, TimingLogger* timings) { 1757 TimingLogger::ScopedTiming t("Verify Dex File", timings); 1758 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1759 ParallelCompilationManager context(class_linker, class_loader, this, &dex_file, dex_files, 1760 thread_pool); 1761 context.ForAll(0, dex_file.NumClassDefs(), VerifyClass, thread_count_); 1762} 1763 1764static void InitializeClass(const ParallelCompilationManager* manager, size_t class_def_index) 1765 LOCKS_EXCLUDED(Locks::mutator_lock_) { 1766 ATRACE_CALL(); 1767 jobject jclass_loader = manager->GetClassLoader(); 1768 const DexFile& dex_file = *manager->GetDexFile(); 1769 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1770 const DexFile::TypeId& class_type_id = dex_file.GetTypeId(class_def.class_idx_); 1771 const char* descriptor = dex_file.StringDataByIdx(class_type_id.descriptor_idx_); 1772 1773 ScopedObjectAccess soa(Thread::Current()); 1774 StackHandleScope<3> hs(soa.Self()); 1775 Handle<mirror::ClassLoader> class_loader( 1776 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1777 Handle<mirror::Class> klass( 1778 hs.NewHandle(manager->GetClassLinker()->FindClass(soa.Self(), descriptor, class_loader))); 1779 1780 if (klass.Get() != nullptr && !SkipClass(jclass_loader, dex_file, klass.Get())) { 1781 // Only try to initialize classes that were successfully verified. 1782 if (klass->IsVerified()) { 1783 // Attempt to initialize the class but bail if we either need to initialize the super-class 1784 // or static fields. 1785 manager->GetClassLinker()->EnsureInitialized(klass, false, false); 1786 if (!klass->IsInitialized()) { 1787 // We don't want non-trivial class initialization occurring on multiple threads due to 1788 // deadlock problems. For example, a parent class is initialized (holding its lock) that 1789 // refers to a sub-class in its static/class initializer causing it to try to acquire the 1790 // sub-class' lock. While on a second thread the sub-class is initialized (holding its lock) 1791 // after first initializing its parents, whose locks are acquired. This leads to a 1792 // parent-to-child and a child-to-parent lock ordering and consequent potential deadlock. 1793 // We need to use an ObjectLock due to potential suspension in the interpreting code. Rather 1794 // than use a special Object for the purpose we use the Class of java.lang.Class. 1795 Handle<mirror::Class> h_klass(hs.NewHandle(klass->GetClass())); 1796 ObjectLock<mirror::Class> lock(soa.Self(), h_klass); 1797 // Attempt to initialize allowing initialization of parent classes but still not static 1798 // fields. 1799 manager->GetClassLinker()->EnsureInitialized(klass, false, true); 1800 if (!klass->IsInitialized()) { 1801 // We need to initialize static fields, we only do this for image classes that aren't 1802 // marked with the $NoPreloadHolder (which implies this should not be initialized early). 1803 bool can_init_static_fields = manager->GetCompiler()->IsImage() && 1804 manager->GetCompiler()->IsImageClass(descriptor) && 1805 !StringPiece(descriptor).ends_with("$NoPreloadHolder;"); 1806 if (can_init_static_fields) { 1807 VLOG(compiler) << "Initializing: " << descriptor; 1808 // TODO multithreading support. We should ensure the current compilation thread has 1809 // exclusive access to the runtime and the transaction. To achieve this, we could use 1810 // a ReaderWriterMutex but we're holding the mutator lock so we fail mutex sanity 1811 // checks in Thread::AssertThreadSuspensionIsAllowable. 1812 Runtime* const runtime = Runtime::Current(); 1813 Transaction transaction; 1814 1815 // Run the class initializer in transaction mode. 1816 runtime->EnterTransactionMode(&transaction); 1817 const mirror::Class::Status old_status = klass->GetStatus(); 1818 bool success = manager->GetClassLinker()->EnsureInitialized(klass, true, true); 1819 // TODO we detach transaction from runtime to indicate we quit the transactional 1820 // mode which prevents the GC from visiting objects modified during the transaction. 1821 // Ensure GC is not run so don't access freed objects when aborting transaction. 1822 const char* old_casue = soa.Self()->StartAssertNoThreadSuspension("Transaction end"); 1823 runtime->ExitTransactionMode(); 1824 1825 if (!success) { 1826 CHECK(soa.Self()->IsExceptionPending()); 1827 ThrowLocation throw_location; 1828 mirror::Throwable* exception = soa.Self()->GetException(&throw_location); 1829 VLOG(compiler) << "Initialization of " << descriptor << " aborted because of " 1830 << exception->Dump(); 1831 soa.Self()->ClearException(); 1832 transaction.Abort(); 1833 CHECK_EQ(old_status, klass->GetStatus()) << "Previous class status not restored"; 1834 } 1835 soa.Self()->EndAssertNoThreadSuspension(old_casue); 1836 } 1837 } 1838 soa.Self()->AssertNoPendingException(); 1839 } 1840 } 1841 // Record the final class status if necessary. 1842 ClassReference ref(manager->GetDexFile(), class_def_index); 1843 manager->GetCompiler()->RecordClassStatus(ref, klass->GetStatus()); 1844 } 1845 // Clear any class not found or verification exceptions. 1846 soa.Self()->ClearException(); 1847} 1848 1849void CompilerDriver::InitializeClasses(jobject jni_class_loader, const DexFile& dex_file, 1850 const std::vector<const DexFile*>& dex_files, 1851 ThreadPool* thread_pool, TimingLogger* timings) { 1852 TimingLogger::ScopedTiming t("InitializeNoClinit", timings); 1853 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1854 ParallelCompilationManager context(class_linker, jni_class_loader, this, &dex_file, dex_files, 1855 thread_pool); 1856 size_t thread_count; 1857 if (IsImage()) { 1858 // TODO: remove this when transactional mode supports multithreading. 1859 thread_count = 1U; 1860 } else { 1861 thread_count = thread_count_; 1862 } 1863 context.ForAll(0, dex_file.NumClassDefs(), InitializeClass, thread_count); 1864} 1865 1866void CompilerDriver::InitializeClasses(jobject class_loader, 1867 const std::vector<const DexFile*>& dex_files, 1868 ThreadPool* thread_pool, TimingLogger* timings) { 1869 for (size_t i = 0; i != dex_files.size(); ++i) { 1870 const DexFile* dex_file = dex_files[i]; 1871 CHECK(dex_file != NULL); 1872 InitializeClasses(class_loader, *dex_file, dex_files, thread_pool, timings); 1873 } 1874 if (IsImage()) { 1875 // Prune garbage objects created during aborted transactions. 1876 Runtime::Current()->GetHeap()->CollectGarbage(true); 1877 } 1878} 1879 1880void CompilerDriver::Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files, 1881 ThreadPool* thread_pool, TimingLogger* timings) { 1882 for (size_t i = 0; i != dex_files.size(); ++i) { 1883 const DexFile* dex_file = dex_files[i]; 1884 CHECK(dex_file != NULL); 1885 CompileDexFile(class_loader, *dex_file, dex_files, thread_pool, timings); 1886 } 1887} 1888 1889void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, size_t class_def_index) { 1890 ATRACE_CALL(); 1891 const DexFile& dex_file = *manager->GetDexFile(); 1892 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index); 1893 ClassLinker* class_linker = manager->GetClassLinker(); 1894 jobject jclass_loader = manager->GetClassLoader(); 1895 { 1896 // Use a scoped object access to perform to the quick SkipClass check. 1897 const char* descriptor = dex_file.GetClassDescriptor(class_def); 1898 ScopedObjectAccess soa(Thread::Current()); 1899 StackHandleScope<3> hs(soa.Self()); 1900 Handle<mirror::ClassLoader> class_loader( 1901 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1902 Handle<mirror::Class> klass( 1903 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor, class_loader))); 1904 if (klass.Get() == nullptr) { 1905 CHECK(soa.Self()->IsExceptionPending()); 1906 soa.Self()->ClearException(); 1907 } else if (SkipClass(jclass_loader, dex_file, klass.Get())) { 1908 return; 1909 } 1910 } 1911 ClassReference ref(&dex_file, class_def_index); 1912 // Skip compiling classes with generic verifier failures since they will still fail at runtime 1913 if (manager->GetCompiler()->verification_results_->IsClassRejected(ref)) { 1914 return; 1915 } 1916 const byte* class_data = dex_file.GetClassData(class_def); 1917 if (class_data == NULL) { 1918 // empty class, probably a marker interface 1919 return; 1920 } 1921 1922 // Can we run DEX-to-DEX compiler on this class ? 1923 DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile; 1924 { 1925 ScopedObjectAccess soa(Thread::Current()); 1926 StackHandleScope<1> hs(soa.Self()); 1927 Handle<mirror::ClassLoader> class_loader( 1928 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader))); 1929 dex_to_dex_compilation_level = GetDexToDexCompilationlevel(soa.Self(), class_loader, dex_file, 1930 class_def); 1931 } 1932 ClassDataItemIterator it(dex_file, class_data); 1933 // Skip fields 1934 while (it.HasNextStaticField()) { 1935 it.Next(); 1936 } 1937 while (it.HasNextInstanceField()) { 1938 it.Next(); 1939 } 1940 CompilerDriver* driver = manager->GetCompiler(); 1941 // Compile direct methods 1942 int64_t previous_direct_method_idx = -1; 1943 while (it.HasNextDirectMethod()) { 1944 uint32_t method_idx = it.GetMemberIndex(); 1945 if (method_idx == previous_direct_method_idx) { 1946 // smali can create dex files with two encoded_methods sharing the same method_idx 1947 // http://code.google.com/p/smali/issues/detail?id=119 1948 it.Next(); 1949 continue; 1950 } 1951 previous_direct_method_idx = method_idx; 1952 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1953 it.GetMethodInvokeType(class_def), class_def_index, 1954 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1955 it.Next(); 1956 } 1957 // Compile virtual methods 1958 int64_t previous_virtual_method_idx = -1; 1959 while (it.HasNextVirtualMethod()) { 1960 uint32_t method_idx = it.GetMemberIndex(); 1961 if (method_idx == previous_virtual_method_idx) { 1962 // smali can create dex files with two encoded_methods sharing the same method_idx 1963 // http://code.google.com/p/smali/issues/detail?id=119 1964 it.Next(); 1965 continue; 1966 } 1967 previous_virtual_method_idx = method_idx; 1968 driver->CompileMethod(it.GetMethodCodeItem(), it.GetMemberAccessFlags(), 1969 it.GetMethodInvokeType(class_def), class_def_index, 1970 method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level); 1971 it.Next(); 1972 } 1973 DCHECK(!it.HasNext()); 1974} 1975 1976void CompilerDriver::CompileDexFile(jobject class_loader, const DexFile& dex_file, 1977 const std::vector<const DexFile*>& dex_files, 1978 ThreadPool* thread_pool, TimingLogger* timings) { 1979 TimingLogger::ScopedTiming t("Compile Dex File", timings); 1980 ParallelCompilationManager context(Runtime::Current()->GetClassLinker(), class_loader, this, 1981 &dex_file, dex_files, thread_pool); 1982 context.ForAll(0, dex_file.NumClassDefs(), CompilerDriver::CompileClass, thread_count_); 1983} 1984 1985void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags, 1986 InvokeType invoke_type, uint16_t class_def_idx, 1987 uint32_t method_idx, jobject class_loader, 1988 const DexFile& dex_file, 1989 DexToDexCompilationLevel dex_to_dex_compilation_level) { 1990 CompiledMethod* compiled_method = NULL; 1991 uint64_t start_ns = kTimeCompileMethod ? NanoTime() : 0; 1992 1993 if ((access_flags & kAccNative) != 0) { 1994 // Are we interpreting only and have support for generic JNI down calls? 1995 if (!compiler_options_->IsCompilationEnabled() && 1996 (instruction_set_ == kX86_64 || instruction_set_ == kArm64)) { 1997 // Leaving this empty will trigger the generic JNI version 1998 } else { 1999 compiled_method = compiler_->JniCompile(access_flags, method_idx, dex_file); 2000 CHECK(compiled_method != NULL); 2001 } 2002 } else if ((access_flags & kAccAbstract) != 0) { 2003 } else { 2004 MethodReference method_ref(&dex_file, method_idx); 2005 bool compile = verification_results_->IsCandidateForCompilation(method_ref, access_flags); 2006 if (compile) { 2007 // NOTE: if compiler declines to compile this method, it will return NULL. 2008 compiled_method = compiler_->Compile(code_item, access_flags, invoke_type, class_def_idx, 2009 method_idx, class_loader, dex_file); 2010 } 2011 if (compiled_method == nullptr && dex_to_dex_compilation_level != kDontDexToDexCompile) { 2012 // TODO: add a command-line option to disable DEX-to-DEX compilation ? 2013 (*dex_to_dex_compiler_)(*this, code_item, access_flags, 2014 invoke_type, class_def_idx, 2015 method_idx, class_loader, dex_file, 2016 dex_to_dex_compilation_level); 2017 } 2018 } 2019 if (kTimeCompileMethod) { 2020 uint64_t duration_ns = NanoTime() - start_ns; 2021 if (duration_ns > MsToNs(compiler_->GetMaximumCompilationTimeBeforeWarning())) { 2022 LOG(WARNING) << "Compilation of " << PrettyMethod(method_idx, dex_file) 2023 << " took " << PrettyDuration(duration_ns); 2024 } 2025 } 2026 2027 Thread* self = Thread::Current(); 2028 if (compiled_method != NULL) { 2029 MethodReference ref(&dex_file, method_idx); 2030 DCHECK(GetCompiledMethod(ref) == NULL) << PrettyMethod(method_idx, dex_file); 2031 { 2032 MutexLock mu(self, compiled_methods_lock_); 2033 compiled_methods_.Put(ref, compiled_method); 2034 } 2035 DCHECK(GetCompiledMethod(ref) != NULL) << PrettyMethod(method_idx, dex_file); 2036 } 2037 2038 if (self->IsExceptionPending()) { 2039 ScopedObjectAccess soa(self); 2040 LOG(FATAL) << "Unexpected exception compiling: " << PrettyMethod(method_idx, dex_file) << "\n" 2041 << self->GetException(NULL)->Dump(); 2042 } 2043} 2044 2045CompiledClass* CompilerDriver::GetCompiledClass(ClassReference ref) const { 2046 MutexLock mu(Thread::Current(), compiled_classes_lock_); 2047 ClassTable::const_iterator it = compiled_classes_.find(ref); 2048 if (it == compiled_classes_.end()) { 2049 return NULL; 2050 } 2051 CHECK(it->second != NULL); 2052 return it->second; 2053} 2054 2055void CompilerDriver::RecordClassStatus(ClassReference ref, mirror::Class::Status status) { 2056 MutexLock mu(Thread::Current(), compiled_classes_lock_); 2057 auto it = compiled_classes_.find(ref); 2058 if (it == compiled_classes_.end() || it->second->GetStatus() != status) { 2059 // An entry doesn't exist or the status is lower than the new status. 2060 if (it != compiled_classes_.end()) { 2061 CHECK_GT(status, it->second->GetStatus()); 2062 delete it->second; 2063 } 2064 switch (status) { 2065 case mirror::Class::kStatusNotReady: 2066 case mirror::Class::kStatusError: 2067 case mirror::Class::kStatusRetryVerificationAtRuntime: 2068 case mirror::Class::kStatusVerified: 2069 case mirror::Class::kStatusInitialized: 2070 break; // Expected states. 2071 default: 2072 LOG(FATAL) << "Unexpected class status for class " 2073 << PrettyDescriptor(ref.first->GetClassDescriptor(ref.first->GetClassDef(ref.second))) 2074 << " of " << status; 2075 } 2076 CompiledClass* compiled_class = new CompiledClass(status); 2077 compiled_classes_.Overwrite(ref, compiled_class); 2078 } 2079} 2080 2081CompiledMethod* CompilerDriver::GetCompiledMethod(MethodReference ref) const { 2082 MutexLock mu(Thread::Current(), compiled_methods_lock_); 2083 MethodTable::const_iterator it = compiled_methods_.find(ref); 2084 if (it == compiled_methods_.end()) { 2085 return NULL; 2086 } 2087 CHECK(it->second != NULL); 2088 return it->second; 2089} 2090 2091void CompilerDriver::AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2092 uint16_t class_def_index) { 2093 WriterMutexLock mu(self, freezing_constructor_lock_); 2094 freezing_constructor_classes_.insert(ClassReference(dex_file, class_def_index)); 2095} 2096 2097bool CompilerDriver::RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, 2098 uint16_t class_def_index) { 2099 ReaderMutexLock mu(self, freezing_constructor_lock_); 2100 return freezing_constructor_classes_.count(ClassReference(dex_file, class_def_index)) != 0; 2101} 2102 2103bool CompilerDriver::WriteElf(const std::string& android_root, 2104 bool is_host, 2105 const std::vector<const art::DexFile*>& dex_files, 2106 OatWriter* oat_writer, 2107 art::File* file) 2108 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2109 return compiler_->WriteElf(file, oat_writer, dex_files, android_root, is_host); 2110} 2111void CompilerDriver::InstructionSetToLLVMTarget(InstructionSet instruction_set, 2112 std::string* target_triple, 2113 std::string* target_cpu, 2114 std::string* target_attr) { 2115 switch (instruction_set) { 2116 case kThumb2: 2117 *target_triple = "thumb-none-linux-gnueabi"; 2118 *target_cpu = "cortex-a9"; 2119 *target_attr = "+thumb2,+neon,+neonfp,+vfp3,+db"; 2120 break; 2121 2122 case kArm: 2123 *target_triple = "armv7-none-linux-gnueabi"; 2124 // TODO: Fix for Nexus S. 2125 *target_cpu = "cortex-a9"; 2126 // TODO: Fix for Xoom. 2127 *target_attr = "+v7,+neon,+neonfp,+vfp3,+db"; 2128 break; 2129 2130 case kX86: 2131 *target_triple = "i386-pc-linux-gnu"; 2132 *target_attr = ""; 2133 break; 2134 2135 case kX86_64: 2136 *target_triple = "x86_64-pc-linux-gnu"; 2137 *target_attr = ""; 2138 break; 2139 2140 case kMips: 2141 *target_triple = "mipsel-unknown-linux"; 2142 *target_attr = "mips32r2"; 2143 break; 2144 2145 default: 2146 LOG(FATAL) << "Unknown instruction set: " << instruction_set; 2147 } 2148 } 2149 2150bool CompilerDriver::SkipCompilation(const std::string& method_name) { 2151 if (!profile_present_) { 2152 return false; 2153 } 2154 // First find the method in the profile file. 2155 ProfileFile::ProfileData data; 2156 if (!profile_file_.GetProfileData(&data, method_name)) { 2157 // Not in profile, no information can be determined. 2158 if (kIsDebugBuild) { 2159 VLOG(compiler) << "not compiling " << method_name << " because it's not in the profile"; 2160 } 2161 return true; 2162 } 2163 2164 // Methods that comprise top_k_threshold % of the total samples will be compiled. 2165 // Compare against the start of the topK percentage bucket just in case the threshold 2166 // falls inside a bucket. 2167 bool compile = data.GetTopKUsedPercentage() - data.GetUsedPercent() 2168 <= compiler_options_->GetTopKProfileThreshold(); 2169 if (kIsDebugBuild) { 2170 if (compile) { 2171 LOG(INFO) << "compiling method " << method_name << " because its usage is part of top " 2172 << data.GetTopKUsedPercentage() << "% with a percent of " << data.GetUsedPercent() << "%" 2173 << " (topKThreshold=" << compiler_options_->GetTopKProfileThreshold() << ")"; 2174 } else { 2175 VLOG(compiler) << "not compiling method " << method_name 2176 << " because it's not part of leading " << compiler_options_->GetTopKProfileThreshold() 2177 << "% samples)"; 2178 } 2179 } 2180 return !compile; 2181} 2182} // namespace art 2183