| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "image_writer.h" |
| |
| #include <sys/stat.h> |
| |
| #include <vector> |
| |
| #include "base/logging.h" |
| #include "base/unix_file/fd_file.h" |
| #include "class_linker.h" |
| #include "compiled_method.h" |
| #include "dex_file-inl.h" |
| #include "driver/compiler_driver.h" |
| #include "elf_writer.h" |
| #include "gc/accounting/card_table-inl.h" |
| #include "gc/accounting/heap_bitmap.h" |
| #include "gc/accounting/space_bitmap-inl.h" |
| #include "gc/heap.h" |
| #include "gc/space/large_object_space.h" |
| #include "gc/space/space-inl.h" |
| #include "globals.h" |
| #include "image.h" |
| #include "intern_table.h" |
| #include "lock_word.h" |
| #include "mirror/art_field-inl.h" |
| #include "mirror/art_method-inl.h" |
| #include "mirror/array-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/dex_cache-inl.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "oat.h" |
| #include "oat_file.h" |
| #include "object_utils.h" |
| #include "runtime.h" |
| #include "scoped_thread_state_change.h" |
| #include "sirt_ref.h" |
| #include "UniquePtr.h" |
| #include "utils.h" |
| |
| using ::art::mirror::ArtField; |
| using ::art::mirror::ArtMethod; |
| using ::art::mirror::Class; |
| using ::art::mirror::DexCache; |
| using ::art::mirror::EntryPointFromInterpreter; |
| using ::art::mirror::Object; |
| using ::art::mirror::ObjectArray; |
| using ::art::mirror::String; |
| |
| namespace art { |
| |
| bool ImageWriter::Write(const std::string& image_filename, |
| uintptr_t image_begin, |
| const std::string& oat_filename, |
| const std::string& oat_location) { |
| CHECK(!image_filename.empty()); |
| |
| CHECK_NE(image_begin, 0U); |
| image_begin_ = reinterpret_cast<byte*>(image_begin); |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| |
| UniquePtr<File> oat_file(OS::OpenFileReadWrite(oat_filename.c_str())); |
| if (oat_file.get() == NULL) { |
| LOG(ERROR) << "Failed to open oat file " << oat_filename << " for " << oat_location; |
| return false; |
| } |
| std::string error_msg; |
| oat_file_ = OatFile::OpenWritable(oat_file.get(), oat_location, &error_msg); |
| if (oat_file_ == nullptr) { |
| LOG(ERROR) << "Failed to open writable oat file " << oat_filename << " for " << oat_location |
| << ": " << error_msg; |
| return false; |
| } |
| CHECK_EQ(class_linker->RegisterOatFile(oat_file_), oat_file_); |
| |
| interpreter_to_interpreter_bridge_offset_ = |
| oat_file_->GetOatHeader().GetInterpreterToInterpreterBridgeOffset(); |
| interpreter_to_compiled_code_bridge_offset_ = |
| oat_file_->GetOatHeader().GetInterpreterToCompiledCodeBridgeOffset(); |
| |
| jni_dlsym_lookup_offset_ = oat_file_->GetOatHeader().GetJniDlsymLookupOffset(); |
| |
| portable_imt_conflict_trampoline_offset_ = |
| oat_file_->GetOatHeader().GetPortableImtConflictTrampolineOffset(); |
| portable_resolution_trampoline_offset_ = |
| oat_file_->GetOatHeader().GetPortableResolutionTrampolineOffset(); |
| portable_to_interpreter_bridge_offset_ = |
| oat_file_->GetOatHeader().GetPortableToInterpreterBridgeOffset(); |
| |
| quick_imt_conflict_trampoline_offset_ = |
| oat_file_->GetOatHeader().GetQuickImtConflictTrampolineOffset(); |
| quick_resolution_trampoline_offset_ = |
| oat_file_->GetOatHeader().GetQuickResolutionTrampolineOffset(); |
| quick_to_interpreter_bridge_offset_ = |
| oat_file_->GetOatHeader().GetQuickToInterpreterBridgeOffset(); |
| { |
| Thread::Current()->TransitionFromSuspendedToRunnable(); |
| PruneNonImageClasses(); // Remove junk |
| ComputeLazyFieldsForImageClasses(); // Add useful information |
| ComputeEagerResolvedStrings(); |
| Thread::Current()->TransitionFromRunnableToSuspended(kNative); |
| } |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| heap->CollectGarbage(false); // Remove garbage. |
| |
| if (!AllocMemory()) { |
| return false; |
| } |
| |
| if (kIsDebugBuild) { |
| ScopedObjectAccess soa(Thread::Current()); |
| CheckNonImageClassesRemoved(); |
| } |
| |
| Thread::Current()->TransitionFromSuspendedToRunnable(); |
| size_t oat_loaded_size = 0; |
| size_t oat_data_offset = 0; |
| ElfWriter::GetOatElfInformation(oat_file.get(), oat_loaded_size, oat_data_offset); |
| CalculateNewObjectOffsets(oat_loaded_size, oat_data_offset); |
| CopyAndFixupObjects(); |
| PatchOatCodeAndMethods(); |
| Thread::Current()->TransitionFromRunnableToSuspended(kNative); |
| |
| UniquePtr<File> image_file(OS::CreateEmptyFile(image_filename.c_str())); |
| ImageHeader* image_header = reinterpret_cast<ImageHeader*>(image_->Begin()); |
| if (image_file.get() == NULL) { |
| LOG(ERROR) << "Failed to open image file " << image_filename; |
| return false; |
| } |
| if (fchmod(image_file->Fd(), 0644) != 0) { |
| PLOG(ERROR) << "Failed to make image file world readable: " << image_filename; |
| return EXIT_FAILURE; |
| } |
| |
| // Write out the image. |
| CHECK_EQ(image_end_, image_header->GetImageSize()); |
| if (!image_file->WriteFully(image_->Begin(), image_end_)) { |
| PLOG(ERROR) << "Failed to write image file " << image_filename; |
| return false; |
| } |
| |
| // Write out the image bitmap at the page aligned start of the image end. |
| CHECK_ALIGNED(image_header->GetImageBitmapOffset(), kPageSize); |
| if (!image_file->Write(reinterpret_cast<char*>(image_bitmap_->Begin()), |
| image_header->GetImageBitmapSize(), |
| image_header->GetImageBitmapOffset())) { |
| PLOG(ERROR) << "Failed to write image file " << image_filename; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void ImageWriter::SetImageOffset(mirror::Object* object, size_t offset) { |
| DCHECK(object != nullptr); |
| DCHECK_NE(offset, 0U); |
| DCHECK(!IsImageOffsetAssigned(object)); |
| mirror::Object* obj = reinterpret_cast<mirror::Object*>(image_->Begin() + offset); |
| DCHECK_ALIGNED(obj, kObjectAlignment); |
| image_bitmap_->Set(obj); |
| // Before we stomp over the lock word, save the hash code for later. |
| Monitor::Deflate(Thread::Current(), object);; |
| LockWord lw(object->GetLockWord()); |
| switch (lw.GetState()) { |
| case LockWord::kFatLocked: { |
| LOG(FATAL) << "Fat locked object " << obj << " found during object copy"; |
| break; |
| } |
| case LockWord::kThinLocked: { |
| LOG(FATAL) << "Thin locked object " << obj << " found during object copy"; |
| break; |
| } |
| case LockWord::kUnlocked: |
| // No hash, don't need to save it. |
| break; |
| case LockWord::kHashCode: |
| saved_hashes_.push_back(std::make_pair(obj, lw.GetHashCode())); |
| break; |
| default: |
| LOG(FATAL) << "Unreachable."; |
| break; |
| } |
| object->SetLockWord(LockWord::FromForwardingAddress(offset)); |
| DCHECK(IsImageOffsetAssigned(object)); |
| } |
| |
| void ImageWriter::AssignImageOffset(mirror::Object* object) { |
| DCHECK(object != nullptr); |
| SetImageOffset(object, image_end_); |
| image_end_ += RoundUp(object->SizeOf(), 8); // 64-bit alignment |
| DCHECK_LT(image_end_, image_->Size()); |
| } |
| |
| bool ImageWriter::IsImageOffsetAssigned(mirror::Object* object) const { |
| DCHECK(object != nullptr); |
| return object->GetLockWord().GetState() == LockWord::kForwardingAddress; |
| } |
| |
| size_t ImageWriter::GetImageOffset(mirror::Object* object) const { |
| DCHECK(object != nullptr); |
| DCHECK(IsImageOffsetAssigned(object)); |
| LockWord lock_word = object->GetLockWord(); |
| size_t offset = lock_word.ForwardingAddress(); |
| DCHECK_LT(offset, image_end_); |
| return offset; |
| } |
| |
| bool ImageWriter::AllocMemory() { |
| size_t length = RoundUp(Runtime::Current()->GetHeap()->GetTotalMemory(), kPageSize); |
| std::string error_msg; |
| image_.reset(MemMap::MapAnonymous("image writer image", NULL, length, PROT_READ | PROT_WRITE, |
| true, &error_msg)); |
| if (UNLIKELY(image_.get() == nullptr)) { |
| LOG(ERROR) << "Failed to allocate memory for image file generation: " << error_msg; |
| return false; |
| } |
| |
| // Create the image bitmap. |
| image_bitmap_.reset(gc::accounting::SpaceBitmap::Create("image bitmap", image_->Begin(), |
| length)); |
| if (image_bitmap_.get() == nullptr) { |
| LOG(ERROR) << "Failed to allocate memory for image bitmap"; |
| return false; |
| } |
| return true; |
| } |
| |
| void ImageWriter::ComputeLazyFieldsForImageClasses() { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| class_linker->VisitClassesWithoutClassesLock(ComputeLazyFieldsForClassesVisitor, NULL); |
| } |
| |
| bool ImageWriter::ComputeLazyFieldsForClassesVisitor(Class* c, void* /*arg*/) { |
| c->ComputeName(); |
| return true; |
| } |
| |
| void ImageWriter::ComputeEagerResolvedStringsCallback(Object* obj, void* arg) { |
| if (!obj->GetClass()->IsStringClass()) { |
| return; |
| } |
| mirror::String* string = obj->AsString(); |
| const uint16_t* utf16_string = string->GetCharArray()->GetData() + string->GetOffset(); |
| for (DexCache* dex_cache : Runtime::Current()->GetClassLinker()->GetDexCaches()) { |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| const DexFile::StringId* string_id; |
| if (UNLIKELY(string->GetLength() == 0)) { |
| string_id = dex_file.FindStringId(""); |
| } else { |
| string_id = dex_file.FindStringId(utf16_string); |
| } |
| if (string_id != nullptr) { |
| // This string occurs in this dex file, assign the dex cache entry. |
| uint32_t string_idx = dex_file.GetIndexForStringId(*string_id); |
| if (dex_cache->GetResolvedString(string_idx) == NULL) { |
| dex_cache->SetResolvedString(string_idx, string); |
| } |
| } |
| } |
| } |
| |
| void ImageWriter::ComputeEagerResolvedStrings() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| Runtime::Current()->GetHeap()->VisitObjects(ComputeEagerResolvedStringsCallback, this); |
| } |
| |
| bool ImageWriter::IsImageClass(Class* klass) { |
| return compiler_driver_.IsImageClass(ClassHelper(klass).GetDescriptor()); |
| } |
| |
| struct NonImageClasses { |
| ImageWriter* image_writer; |
| std::set<std::string>* non_image_classes; |
| }; |
| |
| void ImageWriter::PruneNonImageClasses() { |
| if (compiler_driver_.GetImageClasses() == NULL) { |
| return; |
| } |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| |
| // Make a list of classes we would like to prune. |
| std::set<std::string> non_image_classes; |
| NonImageClasses context; |
| context.image_writer = this; |
| context.non_image_classes = &non_image_classes; |
| class_linker->VisitClasses(NonImageClassesVisitor, &context); |
| |
| // Remove the undesired classes from the class roots. |
| for (const std::string& it : non_image_classes) { |
| class_linker->RemoveClass(it.c_str(), NULL); |
| } |
| |
| // Clear references to removed classes from the DexCaches. |
| ArtMethod* resolution_method = runtime->GetResolutionMethod(); |
| for (DexCache* dex_cache : class_linker->GetDexCaches()) { |
| for (size_t i = 0; i < dex_cache->NumResolvedTypes(); i++) { |
| Class* klass = dex_cache->GetResolvedType(i); |
| if (klass != NULL && !IsImageClass(klass)) { |
| dex_cache->SetResolvedType(i, NULL); |
| } |
| } |
| for (size_t i = 0; i < dex_cache->NumResolvedMethods(); i++) { |
| ArtMethod* method = dex_cache->GetResolvedMethod(i); |
| if (method != NULL && !IsImageClass(method->GetDeclaringClass())) { |
| dex_cache->SetResolvedMethod(i, resolution_method); |
| } |
| } |
| for (size_t i = 0; i < dex_cache->NumResolvedFields(); i++) { |
| ArtField* field = dex_cache->GetResolvedField(i); |
| if (field != NULL && !IsImageClass(field->GetDeclaringClass())) { |
| dex_cache->SetResolvedField(i, NULL); |
| } |
| } |
| } |
| } |
| |
| bool ImageWriter::NonImageClassesVisitor(Class* klass, void* arg) { |
| NonImageClasses* context = reinterpret_cast<NonImageClasses*>(arg); |
| if (!context->image_writer->IsImageClass(klass)) { |
| context->non_image_classes->insert(ClassHelper(klass).GetDescriptor()); |
| } |
| return true; |
| } |
| |
| void ImageWriter::CheckNonImageClassesRemoved() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| if (compiler_driver_.GetImageClasses() != nullptr) { |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| ReaderMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| heap->VisitObjects(CheckNonImageClassesRemovedCallback, this); |
| } |
| } |
| |
| void ImageWriter::CheckNonImageClassesRemovedCallback(Object* obj, void* arg) { |
| ImageWriter* image_writer = reinterpret_cast<ImageWriter*>(arg); |
| if (obj->IsClass()) { |
| Class* klass = obj->AsClass(); |
| if (!image_writer->IsImageClass(klass)) { |
| image_writer->DumpImageClasses(); |
| CHECK(image_writer->IsImageClass(klass)) << ClassHelper(klass).GetDescriptor() |
| << " " << PrettyDescriptor(klass); |
| } |
| } |
| } |
| |
| void ImageWriter::DumpImageClasses() { |
| CompilerDriver::DescriptorSet* image_classes = compiler_driver_.GetImageClasses(); |
| CHECK(image_classes != NULL); |
| for (const std::string& image_class : *image_classes) { |
| LOG(INFO) << " " << image_class; |
| } |
| } |
| |
| void ImageWriter::CalculateObjectOffsets(Object* obj) { |
| DCHECK(obj != NULL); |
| // if it is a string, we want to intern it if its not interned. |
| if (obj->GetClass()->IsStringClass()) { |
| // we must be an interned string that was forward referenced and already assigned |
| if (IsImageOffsetAssigned(obj)) { |
| DCHECK_EQ(obj, obj->AsString()->Intern()); |
| return; |
| } |
| Thread* self = Thread::Current(); |
| SirtRef<Object> sirt_obj(self, obj); |
| mirror::String* interned = obj->AsString()->Intern(); |
| if (sirt_obj.get() != interned) { |
| if (!IsImageOffsetAssigned(interned)) { |
| // interned obj is after us, allocate its location early |
| AssignImageOffset(interned); |
| } |
| // point those looking for this object to the interned version. |
| SetImageOffset(sirt_obj.get(), GetImageOffset(interned)); |
| return; |
| } |
| // else (obj == interned), nothing to do but fall through to the normal case |
| } |
| |
| AssignImageOffset(obj); |
| } |
| |
| ObjectArray<Object>* ImageWriter::CreateImageRoots() const { |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| Thread* self = Thread::Current(); |
| SirtRef<Class> object_array_class(self, class_linker->FindSystemClass("[Ljava/lang/Object;")); |
| |
| // build an Object[] of all the DexCaches used in the source_space_ |
| ObjectArray<Object>* dex_caches = ObjectArray<Object>::Alloc(self, object_array_class.get(), |
| class_linker->GetDexCaches().size()); |
| int i = 0; |
| for (DexCache* dex_cache : class_linker->GetDexCaches()) { |
| dex_caches->Set<false>(i++, dex_cache); |
| } |
| |
| // build an Object[] of the roots needed to restore the runtime |
| SirtRef<ObjectArray<Object> > image_roots( |
| self, ObjectArray<Object>::Alloc(self, object_array_class.get(), ImageHeader::kImageRootsMax)); |
| image_roots->Set<false>(ImageHeader::kResolutionMethod, runtime->GetResolutionMethod()); |
| image_roots->Set<false>(ImageHeader::kImtConflictMethod, runtime->GetImtConflictMethod()); |
| image_roots->Set<false>(ImageHeader::kDefaultImt, runtime->GetDefaultImt()); |
| image_roots->Set<false>(ImageHeader::kCalleeSaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kSaveAll)); |
| image_roots->Set<false>(ImageHeader::kRefsOnlySaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)); |
| image_roots->Set<false>(ImageHeader::kRefsAndArgsSaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)); |
| image_roots->Set<false>(ImageHeader::kOatLocation, |
| String::AllocFromModifiedUtf8(self, oat_file_->GetLocation().c_str())); |
| image_roots->Set<false>(ImageHeader::kDexCaches, dex_caches); |
| image_roots->Set<false>(ImageHeader::kClassRoots, class_linker->GetClassRoots()); |
| for (int i = 0; i < ImageHeader::kImageRootsMax; i++) { |
| CHECK(image_roots->Get(i) != NULL); |
| } |
| return image_roots.get(); |
| } |
| |
| // Walk instance fields of the given Class. Separate function to allow recursion on the super |
| // class. |
| void ImageWriter::WalkInstanceFields(mirror::Object* obj, mirror::Class* klass) { |
| // Visit fields of parent classes first. |
| SirtRef<mirror::Class> sirt_class(Thread::Current(), klass); |
| mirror::Class* super = sirt_class->GetSuperClass(); |
| if (super != nullptr) { |
| WalkInstanceFields(obj, super); |
| } |
| // |
| size_t num_reference_fields = sirt_class->NumReferenceInstanceFields(); |
| for (size_t i = 0; i < num_reference_fields; ++i) { |
| mirror::ArtField* field = sirt_class->GetInstanceField(i); |
| MemberOffset field_offset = field->GetOffset(); |
| mirror::Object* value = obj->GetFieldObject<mirror::Object>(field_offset, false); |
| if (value != nullptr) { |
| WalkFieldsInOrder(value); |
| } |
| } |
| } |
| |
| // For an unvisited object, visit it then all its children found via fields. |
| void ImageWriter::WalkFieldsInOrder(mirror::Object* obj) { |
| if (!IsImageOffsetAssigned(obj)) { |
| // Walk instance fields of all objects |
| Thread* self = Thread::Current(); |
| SirtRef<mirror::Object> sirt_obj(self, obj); |
| SirtRef<mirror::Class> klass(self, obj->GetClass()); |
| // visit the object itself. |
| CalculateObjectOffsets(sirt_obj.get()); |
| WalkInstanceFields(sirt_obj.get(), klass.get()); |
| // Walk static fields of a Class. |
| if (sirt_obj->IsClass()) { |
| size_t num_static_fields = klass->NumReferenceStaticFields(); |
| for (size_t i = 0; i < num_static_fields; ++i) { |
| mirror::ArtField* field = klass->GetStaticField(i); |
| MemberOffset field_offset = field->GetOffset(); |
| mirror::Object* value = sirt_obj->GetFieldObject<mirror::Object>(field_offset, false); |
| if (value != nullptr) { |
| WalkFieldsInOrder(value); |
| } |
| } |
| } else if (sirt_obj->IsObjectArray()) { |
| // Walk elements of an object array. |
| int32_t length = sirt_obj->AsObjectArray<mirror::Object>()->GetLength(); |
| for (int32_t i = 0; i < length; i++) { |
| mirror::ObjectArray<mirror::Object>* obj_array = sirt_obj->AsObjectArray<mirror::Object>(); |
| mirror::Object* value = obj_array->Get(i); |
| if (value != nullptr) { |
| WalkFieldsInOrder(value); |
| } |
| } |
| } |
| } |
| } |
| |
| void ImageWriter::WalkFieldsCallback(mirror::Object* obj, void* arg) { |
| ImageWriter* writer = reinterpret_cast<ImageWriter*>(arg); |
| DCHECK(writer != nullptr); |
| writer->WalkFieldsInOrder(obj); |
| } |
| |
| void ImageWriter::CalculateNewObjectOffsets(size_t oat_loaded_size, size_t oat_data_offset) { |
| CHECK_NE(0U, oat_loaded_size); |
| Thread* self = Thread::Current(); |
| SirtRef<ObjectArray<Object> > image_roots(self, CreateImageRoots()); |
| |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| DCHECK_EQ(0U, image_end_); |
| |
| // Leave space for the header, but do not write it yet, we need to |
| // know where image_roots is going to end up |
| image_end_ += RoundUp(sizeof(ImageHeader), 8); // 64-bit-alignment |
| |
| { |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| // TODO: Image spaces only? |
| const char* old = self->StartAssertNoThreadSuspension("ImageWriter"); |
| DCHECK_LT(image_end_, image_->Size()); |
| // Clear any pre-existing monitors which may have been in the monitor words. |
| heap->VisitObjects(WalkFieldsCallback, this); |
| self->EndAssertNoThreadSuspension(old); |
| } |
| |
| const byte* oat_file_begin = image_begin_ + RoundUp(image_end_, kPageSize); |
| const byte* oat_file_end = oat_file_begin + oat_loaded_size; |
| oat_data_begin_ = oat_file_begin + oat_data_offset; |
| const byte* oat_data_end = oat_data_begin_ + oat_file_->Size(); |
| |
| // Return to write header at start of image with future location of image_roots. At this point, |
| // image_end_ is the size of the image (excluding bitmaps). |
| const size_t heap_bytes_per_bitmap_byte = kBitsPerByte * gc::accounting::SpaceBitmap::kAlignment; |
| const size_t bitmap_bytes = RoundUp(image_end_, heap_bytes_per_bitmap_byte) / |
| heap_bytes_per_bitmap_byte; |
| ImageHeader image_header(PointerToLowMemUInt32(image_begin_), |
| static_cast<uint32_t>(image_end_), |
| RoundUp(image_end_, kPageSize), |
| RoundUp(bitmap_bytes, kPageSize), |
| PointerToLowMemUInt32(GetImageAddress(image_roots.get())), |
| oat_file_->GetOatHeader().GetChecksum(), |
| PointerToLowMemUInt32(oat_file_begin), |
| PointerToLowMemUInt32(oat_data_begin_), |
| PointerToLowMemUInt32(oat_data_end), |
| PointerToLowMemUInt32(oat_file_end)); |
| memcpy(image_->Begin(), &image_header, sizeof(image_header)); |
| |
| // Note that image_end_ is left at end of used space |
| } |
| |
| void ImageWriter::CopyAndFixupObjects() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| Thread* self = Thread::Current(); |
| const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); |
| gc::Heap* heap = Runtime::Current()->GetHeap(); |
| // TODO: heap validation can't handle this fix up pass |
| heap->DisableObjectValidation(); |
| // TODO: Image spaces only? |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| heap->VisitObjects(CopyAndFixupObjectsCallback, this); |
| // Fix up the object previously had hash codes. |
| for (const std::pair<mirror::Object*, uint32_t>& hash_pair : saved_hashes_) { |
| hash_pair.first->SetLockWord(LockWord::FromHashCode(hash_pair.second)); |
| } |
| saved_hashes_.clear(); |
| self->EndAssertNoThreadSuspension(old_cause); |
| } |
| |
| void ImageWriter::CopyAndFixupObjectsCallback(Object* obj, void* arg) { |
| DCHECK(obj != NULL); |
| DCHECK(arg != NULL); |
| ImageWriter* image_writer = reinterpret_cast<ImageWriter*>(arg); |
| // see GetLocalAddress for similar computation |
| size_t offset = image_writer->GetImageOffset(obj); |
| byte* dst = image_writer->image_->Begin() + offset; |
| const byte* src = reinterpret_cast<const byte*>(obj); |
| size_t n = obj->SizeOf(); |
| DCHECK_LT(offset + n, image_writer->image_->Size()); |
| memcpy(dst, src, n); |
| Object* copy = reinterpret_cast<Object*>(dst); |
| // Write in a hash code of objects which have inflated monitors or a hash code in their monitor |
| // word. |
| copy->SetLockWord(LockWord()); |
| image_writer->FixupObject(obj, copy); |
| } |
| |
| void ImageWriter::FixupObject(Object* orig, Object* copy) { |
| DCHECK(orig != NULL); |
| DCHECK(copy != NULL); |
| copy->SetClass<kVerifyNone>(down_cast<Class*>(GetImageAddress(orig->GetClass()))); |
| // TODO: special case init of pointers to malloc data (or removal of these pointers) |
| if (orig->IsClass<kVerifyNone>()) { |
| FixupClass(orig->AsClass<kVerifyNone>(), down_cast<Class*>(copy)); |
| } else if (orig->IsObjectArray<kVerifyNone>()) { |
| FixupObjectArray(orig->AsObjectArray<Object, kVerifyNone>(), |
| down_cast<ObjectArray<Object>*>(copy)); |
| } else if (orig->IsArtMethod<kVerifyNone>()) { |
| FixupMethod(orig->AsArtMethod<kVerifyNone>(), down_cast<ArtMethod*>(copy)); |
| } else { |
| FixupInstanceFields(orig, copy); |
| } |
| } |
| |
| void ImageWriter::FixupClass(Class* orig, Class* copy) { |
| FixupInstanceFields(orig, copy); |
| FixupStaticFields(orig, copy); |
| } |
| |
| void ImageWriter::FixupMethod(ArtMethod* orig, ArtMethod* copy) { |
| FixupInstanceFields(orig, copy); |
| |
| // OatWriter replaces the code_ with an offset value. Here we re-adjust to a pointer relative to |
| // oat_begin_ |
| |
| // The resolution method has a special trampoline to call. |
| if (UNLIKELY(orig == Runtime::Current()->GetResolutionMethod())) { |
| copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_resolution_trampoline_offset_)); |
| copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_resolution_trampoline_offset_)); |
| } else if (UNLIKELY(orig == Runtime::Current()->GetImtConflictMethod())) { |
| copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_imt_conflict_trampoline_offset_)); |
| copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_imt_conflict_trampoline_offset_)); |
| } else { |
| // We assume all methods have code. If they don't currently then we set them to the use the |
| // resolution trampoline. Abstract methods never have code and so we need to make sure their |
| // use results in an AbstractMethodError. We use the interpreter to achieve this. |
| if (UNLIKELY(orig->IsAbstract())) { |
| copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_to_interpreter_bridge_offset_)); |
| copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_to_interpreter_bridge_offset_)); |
| copy->SetEntryPointFromInterpreter<kVerifyNone>(reinterpret_cast<EntryPointFromInterpreter*> |
| (const_cast<byte*>(GetOatAddress(interpreter_to_interpreter_bridge_offset_)))); |
| } else { |
| copy->SetEntryPointFromInterpreter<kVerifyNone>(reinterpret_cast<EntryPointFromInterpreter*> |
| (const_cast<byte*>(GetOatAddress(interpreter_to_compiled_code_bridge_offset_)))); |
| // Use original code if it exists. Otherwise, set the code pointer to the resolution |
| // trampoline. |
| const byte* quick_code = GetOatAddress(orig->GetQuickOatCodeOffset()); |
| if (quick_code != nullptr) { |
| copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(quick_code); |
| } else { |
| copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_resolution_trampoline_offset_)); |
| } |
| const byte* portable_code = GetOatAddress(orig->GetPortableOatCodeOffset()); |
| if (portable_code != nullptr) { |
| copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(portable_code); |
| } else { |
| copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_resolution_trampoline_offset_)); |
| } |
| if (orig->IsNative()) { |
| // The native method's pointer is set to a stub to lookup via dlsym. |
| // Note this is not the code_ pointer, that is handled above. |
| copy->SetNativeMethod<kVerifyNone>(GetOatAddress(jni_dlsym_lookup_offset_)); |
| } else { |
| // Normal (non-abstract non-native) methods have various tables to relocate. |
| uint32_t mapping_table_off = orig->GetOatMappingTableOffset(); |
| const byte* mapping_table = GetOatAddress(mapping_table_off); |
| copy->SetMappingTable<kVerifyNone>(mapping_table); |
| |
| uint32_t vmap_table_offset = orig->GetOatVmapTableOffset(); |
| const byte* vmap_table = GetOatAddress(vmap_table_offset); |
| copy->SetVmapTable<kVerifyNone>(vmap_table); |
| |
| uint32_t native_gc_map_offset = orig->GetOatNativeGcMapOffset(); |
| const byte* native_gc_map = GetOatAddress(native_gc_map_offset); |
| copy->SetNativeGcMap<kVerifyNone>(reinterpret_cast<const uint8_t*>(native_gc_map)); |
| } |
| } |
| } |
| } |
| |
| void ImageWriter::FixupObjectArray(ObjectArray<Object>* orig, ObjectArray<Object>* copy) { |
| for (int32_t i = 0; i < orig->GetLength(); ++i) { |
| Object* element = orig->Get(i); |
| copy->SetWithoutChecksAndWriteBarrier<false, true, kVerifyNone>(i, GetImageAddress(element)); |
| } |
| } |
| |
| void ImageWriter::FixupInstanceFields(Object* orig, Object* copy) { |
| DCHECK(orig != NULL); |
| DCHECK(copy != NULL); |
| Class* klass = orig->GetClass(); |
| DCHECK(klass != NULL); |
| FixupFields(orig, copy, klass->GetReferenceInstanceOffsets(), false); |
| } |
| |
| void ImageWriter::FixupStaticFields(Class* orig, Class* copy) { |
| DCHECK(orig != NULL); |
| DCHECK(copy != NULL); |
| FixupFields(orig, copy, orig->GetReferenceStaticOffsets(), true); |
| } |
| |
| void ImageWriter::FixupFields(Object* orig, |
| Object* copy, |
| uint32_t ref_offsets, |
| bool is_static) { |
| if (ref_offsets != CLASS_WALK_SUPER) { |
| // Found a reference offset bitmap. Fixup the specified offsets. |
| while (ref_offsets != 0) { |
| size_t right_shift = CLZ(ref_offsets); |
| MemberOffset byte_offset = CLASS_OFFSET_FROM_CLZ(right_shift); |
| Object* ref = orig->GetFieldObject<Object, kVerifyNone>(byte_offset, false); |
| // Use SetFieldObjectWithoutWriteBarrier to avoid card marking since we are writing to the |
| // image. |
| copy->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>( |
| byte_offset, GetImageAddress(ref), false); |
| ref_offsets &= ~(CLASS_HIGH_BIT >> right_shift); |
| } |
| } else { |
| // There is no reference offset bitmap. In the non-static case, |
| // walk up the class inheritance hierarchy and find reference |
| // offsets the hard way. In the static case, just consider this |
| // class. |
| for (Class *klass = is_static ? orig->AsClass() : orig->GetClass(); |
| klass != NULL; |
| klass = is_static ? NULL : klass->GetSuperClass()) { |
| size_t num_reference_fields = (is_static |
| ? klass->NumReferenceStaticFields() |
| : klass->NumReferenceInstanceFields()); |
| for (size_t i = 0; i < num_reference_fields; ++i) { |
| ArtField* field = (is_static |
| ? klass->GetStaticField(i) |
| : klass->GetInstanceField(i)); |
| MemberOffset field_offset = field->GetOffset(); |
| Object* ref = orig->GetFieldObject<Object, kVerifyNone>(field_offset, false); |
| // Use SetFieldObjectWithoutWriteBarrier to avoid card marking since we are writing to the |
| // image. |
| copy->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>( |
| field_offset, GetImageAddress(ref), false); |
| } |
| } |
| } |
| if (!is_static && orig->IsReferenceInstance()) { |
| // Fix-up referent, that isn't marked as an object field, for References. |
| ArtField* field = orig->GetClass()->FindInstanceField("referent", "Ljava/lang/Object;"); |
| MemberOffset field_offset = field->GetOffset(); |
| Object* ref = orig->GetFieldObject<Object>(field_offset, false); |
| // Use SetFieldObjectWithoutWriteBarrier to avoid card marking since we are writing to the |
| // image. |
| copy->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>( |
| field_offset, GetImageAddress(ref), false); |
| } |
| } |
| |
| static ArtMethod* GetTargetMethod(const CompilerDriver::CallPatchInformation* patch) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| Thread* self = Thread::Current(); |
| SirtRef<mirror::DexCache> dex_cache(self, class_linker->FindDexCache(patch->GetDexFile())); |
| SirtRef<mirror::ClassLoader> class_loader(self, nullptr); |
| ArtMethod* method = class_linker->ResolveMethod(patch->GetDexFile(), |
| patch->GetTargetMethodIdx(), |
| dex_cache, |
| class_loader, |
| NULL, |
| patch->GetTargetInvokeType()); |
| CHECK(method != NULL) |
| << patch->GetDexFile().GetLocation() << " " << patch->GetTargetMethodIdx(); |
| CHECK(!method->IsRuntimeMethod()) |
| << patch->GetDexFile().GetLocation() << " " << patch->GetTargetMethodIdx(); |
| CHECK(dex_cache->GetResolvedMethods()->Get(patch->GetTargetMethodIdx()) == method) |
| << patch->GetDexFile().GetLocation() << " " << patch->GetReferrerMethodIdx() << " " |
| << PrettyMethod(dex_cache->GetResolvedMethods()->Get(patch->GetTargetMethodIdx())) << " " |
| << PrettyMethod(method); |
| return method; |
| } |
| |
| static Class* GetTargetType(const CompilerDriver::TypePatchInformation* patch) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| Thread* self = Thread::Current(); |
| SirtRef<mirror::DexCache> dex_cache(self, class_linker->FindDexCache(patch->GetDexFile())); |
| SirtRef<mirror::ClassLoader> class_loader(self, nullptr); |
| Class* klass = class_linker->ResolveType(patch->GetDexFile(), |
| patch->GetTargetTypeIdx(), |
| dex_cache, |
| class_loader); |
| CHECK(klass != NULL) |
| << patch->GetDexFile().GetLocation() << " " << patch->GetTargetTypeIdx(); |
| CHECK(dex_cache->GetResolvedTypes()->Get(patch->GetTargetTypeIdx()) == klass) |
| << patch->GetDexFile().GetLocation() << " " << patch->GetReferrerMethodIdx() << " " |
| << PrettyClass(dex_cache->GetResolvedTypes()->Get(patch->GetTargetTypeIdx())) << " " |
| << PrettyClass(klass); |
| return klass; |
| } |
| |
| void ImageWriter::PatchOatCodeAndMethods() { |
| Thread* self = Thread::Current(); |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); |
| |
| typedef std::vector<const CompilerDriver::CallPatchInformation*> CallPatches; |
| const CallPatches& code_to_patch = compiler_driver_.GetCodeToPatch(); |
| for (size_t i = 0; i < code_to_patch.size(); i++) { |
| const CompilerDriver::CallPatchInformation* patch = code_to_patch[i]; |
| ArtMethod* target = GetTargetMethod(patch); |
| uintptr_t quick_code = reinterpret_cast<uintptr_t>(class_linker->GetQuickOatCodeFor(target)); |
| uintptr_t code_base = reinterpret_cast<uintptr_t>(&oat_file_->GetOatHeader()); |
| uintptr_t code_offset = quick_code - code_base; |
| if (patch->IsRelative()) { |
| // value to patch is relative to the location being patched |
| const void* quick_oat_code = |
| class_linker->GetQuickOatCodeFor(patch->GetDexFile(), |
| patch->GetReferrerClassDefIdx(), |
| patch->GetReferrerMethodIdx()); |
| uintptr_t base = reinterpret_cast<uintptr_t>(quick_oat_code); |
| uintptr_t patch_location = base + patch->GetLiteralOffset(); |
| uintptr_t value = quick_code - patch_location + patch->RelativeOffset(); |
| SetPatchLocation(patch, value); |
| } else { |
| SetPatchLocation(patch, PointerToLowMemUInt32(GetOatAddress(code_offset))); |
| } |
| } |
| |
| const CallPatches& methods_to_patch = compiler_driver_.GetMethodsToPatch(); |
| for (size_t i = 0; i < methods_to_patch.size(); i++) { |
| const CompilerDriver::CallPatchInformation* patch = methods_to_patch[i]; |
| ArtMethod* target = GetTargetMethod(patch); |
| SetPatchLocation(patch, PointerToLowMemUInt32(GetImageAddress(target))); |
| } |
| |
| const std::vector<const CompilerDriver::TypePatchInformation*>& classes_to_patch = |
| compiler_driver_.GetClassesToPatch(); |
| for (size_t i = 0; i < classes_to_patch.size(); i++) { |
| const CompilerDriver::TypePatchInformation* patch = classes_to_patch[i]; |
| Class* target = GetTargetType(patch); |
| SetPatchLocation(patch, PointerToLowMemUInt32(GetImageAddress(target))); |
| } |
| |
| // Update the image header with the new checksum after patching |
| ImageHeader* image_header = reinterpret_cast<ImageHeader*>(image_->Begin()); |
| image_header->SetOatChecksum(oat_file_->GetOatHeader().GetChecksum()); |
| self->EndAssertNoThreadSuspension(old_cause); |
| } |
| |
| void ImageWriter::SetPatchLocation(const CompilerDriver::PatchInformation* patch, uint32_t value) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const void* quick_oat_code = class_linker->GetQuickOatCodeFor(patch->GetDexFile(), |
| patch->GetReferrerClassDefIdx(), |
| patch->GetReferrerMethodIdx()); |
| OatHeader& oat_header = const_cast<OatHeader&>(oat_file_->GetOatHeader()); |
| // TODO: make this Thumb2 specific |
| uint8_t* base = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(quick_oat_code) & ~0x1); |
| uint32_t* patch_location = reinterpret_cast<uint32_t*>(base + patch->GetLiteralOffset()); |
| if (kIsDebugBuild) { |
| if (patch->IsCall()) { |
| const CompilerDriver::CallPatchInformation* cpatch = patch->AsCall(); |
| const DexFile::MethodId& id = cpatch->GetDexFile().GetMethodId(cpatch->GetTargetMethodIdx()); |
| uintptr_t expected = reinterpret_cast<uintptr_t>(&id); |
| uint32_t actual = *patch_location; |
| CHECK(actual == expected || actual == value) << std::hex |
| << "actual=" << actual |
| << "expected=" << expected |
| << "value=" << value; |
| } |
| if (patch->IsType()) { |
| const CompilerDriver::TypePatchInformation* tpatch = patch->AsType(); |
| const DexFile::TypeId& id = tpatch->GetDexFile().GetTypeId(tpatch->GetTargetTypeIdx()); |
| uintptr_t expected = reinterpret_cast<uintptr_t>(&id); |
| uint32_t actual = *patch_location; |
| CHECK(actual == expected || actual == value) << std::hex |
| << "actual=" << actual |
| << "expected=" << expected |
| << "value=" << value; |
| } |
| } |
| *patch_location = value; |
| oat_header.UpdateChecksum(patch_location, sizeof(value)); |
| } |
| |
| } // namespace art |