| /* |
| * 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 "class_linker.h" |
| #include "class_loader.h" |
| #include "compiled_method.h" |
| #include "compiler.h" |
| #include "dex_cache.h" |
| #include "file.h" |
| #include "gc/large_object_space.h" |
| #include "gc/space.h" |
| #include "globals.h" |
| #include "heap.h" |
| #include "image.h" |
| #include "intern_table.h" |
| #include "logging.h" |
| #include "oat_file.h" |
| #include "object.h" |
| #include "object_utils.h" |
| #include "runtime.h" |
| #include "scoped_thread_state_change.h" |
| #include "sirt_ref.h" |
| #include "UniquePtr.h" |
| #include "utils.h" |
| |
| namespace art { |
| |
| bool ImageWriter::Write(const std::string& image_filename, |
| uintptr_t image_begin, |
| const std::string& oat_filename, |
| const std::string& oat_location, |
| const Compiler& compiler) { |
| CHECK(!image_filename.empty()); |
| |
| CHECK_NE(image_begin, 0U); |
| image_begin_ = reinterpret_cast<byte*>(image_begin); |
| |
| Heap* heap = Runtime::Current()->GetHeap(); |
| const Spaces& spaces = heap->GetSpaces(); |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const std::vector<DexCache*>& all_dex_caches = class_linker->GetDexCaches(); |
| for (size_t i = 0; i < all_dex_caches.size(); i++) { |
| DexCache* dex_cache = all_dex_caches[i]; |
| dex_caches_.insert(dex_cache); |
| } |
| |
| oat_file_ = OatFile::Open(oat_filename, oat_location, NULL, true); |
| if (oat_file_ == NULL) { |
| LOG(ERROR) << "Failed to open oat file " << oat_filename; |
| return false; |
| } |
| class_linker->RegisterOatFile(*oat_file_); |
| |
| { |
| Thread::Current()->TransitionFromSuspendedToRunnable(); |
| PruneNonImageClasses(); // Remove junk |
| ComputeLazyFieldsForImageClasses(); // Add useful information |
| ComputeEagerResolvedStrings(); |
| Thread::Current()->TransitionFromRunnableToSuspended(kNative); |
| } |
| heap->CollectGarbage(false); // Remove garbage |
| // Trim size of alloc spaces |
| // TODO: C++0x auto |
| for (Spaces::const_iterator cur = spaces.begin(); cur != spaces.end(); ++cur) { |
| if ((*cur)->IsAllocSpace()) { |
| (*cur)->AsAllocSpace()->Trim(); |
| } |
| } |
| |
| if (!AllocMemory()) { |
| return false; |
| } |
| #ifndef NDEBUG |
| { |
| ScopedObjectAccess soa(Thread::Current()); |
| CheckNonImageClassesRemoved(); |
| } |
| #endif |
| Thread::Current()->TransitionFromSuspendedToRunnable(); |
| CalculateNewObjectOffsets(); |
| CopyAndFixupObjects(); |
| PatchOatCodeAndMethods(compiler); |
| Thread::Current()->TransitionFromRunnableToSuspended(kNative); |
| |
| UniquePtr<File> file(OS::OpenFile(image_filename.c_str(), true)); |
| if (file.get() == NULL) { |
| LOG(ERROR) << "Failed to open image file " << image_filename; |
| return false; |
| } |
| if (fchmod(file->Fd(), 0644) != 0) { |
| PLOG(ERROR) << "Failed to make image file world readable: " << image_filename; |
| return EXIT_FAILURE; |
| } |
| bool success = file->WriteFully(image_->Begin(), image_end_); |
| if (!success) { |
| PLOG(ERROR) << "Failed to write image file " << image_filename; |
| return false; |
| } |
| return true; |
| } |
| |
| bool ImageWriter::AllocMemory() { |
| const Spaces& spaces = Runtime::Current()->GetHeap()->GetSpaces(); |
| size_t size = 0; |
| for (Spaces::const_iterator it = spaces.begin(); it != spaces.end(); ++it) { |
| if ((*it)->IsAllocSpace()) { |
| size += (*it)->Size(); |
| } |
| } |
| |
| int prot = PROT_READ | PROT_WRITE; |
| size_t length = RoundUp(size, kPageSize); |
| image_.reset(MemMap::MapAnonymous("image-writer-image", NULL, length, prot)); |
| if (image_.get() == NULL) { |
| LOG(ERROR) << "Failed to allocate memory for image file generation"; |
| return false; |
| } |
| return true; |
| } |
| |
| void ImageWriter::ComputeLazyFieldsForImageClasses() { |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->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; |
| } |
| String* string = obj->AsString(); |
| std::string utf8_string(string->ToModifiedUtf8()); |
| ImageWriter* writer = reinterpret_cast<ImageWriter*>(arg); |
| typedef Set::const_iterator CacheIt; // TODO: C++0x auto |
| for (CacheIt it = writer->dex_caches_.begin(), end = writer->dex_caches_.end(); it != end; ++it) { |
| DexCache* dex_cache = *it; |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| const DexFile::StringId* string_id = dex_file.FindStringId(utf8_string); |
| if (string_id != NULL) { |
| // 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_) { |
| // TODO: Check image spaces only? |
| Heap* heap = Runtime::Current()->GetHeap(); |
| WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_); |
| heap->FlushAllocStack(); |
| heap->GetLiveBitmap()->Walk(ComputeEagerResolvedStringsCallback, this); |
| } |
| |
| bool ImageWriter::IsImageClass(const Class* klass) { |
| if (image_classes_ == NULL) { |
| return true; |
| } |
| while (klass->IsArrayClass()) { |
| klass = klass->GetComponentType(); |
| } |
| if (klass->IsPrimitive()) { |
| return true; |
| } |
| const std::string descriptor(ClassHelper(klass).GetDescriptor()); |
| return image_classes_->find(descriptor) != image_classes_->end(); |
| } |
| |
| |
| struct NonImageClasses { |
| ImageWriter* image_writer; |
| std::set<std::string>* non_image_classes; |
| }; |
| |
| void ImageWriter::PruneNonImageClasses() { |
| if (image_classes_ == NULL) { |
| return; |
| } |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| |
| 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); |
| |
| typedef std::set<std::string>::const_iterator ClassIt; // TODO: C++0x auto |
| for (ClassIt it = non_image_classes.begin(), end = non_image_classes.end(); it != end; ++it) { |
| class_linker->RemoveClass((*it).c_str(), NULL); |
| } |
| |
| AbstractMethod* resolution_method = runtime->GetResolutionMethod(); |
| typedef Set::const_iterator CacheIt; // TODO: C++0x auto |
| for (CacheIt it = dex_caches_.begin(), end = dex_caches_.end(); it != end; ++it) { |
| DexCache* dex_cache = *it; |
| 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); |
| dex_cache->GetInitializedStaticStorage()->Set(i, NULL); |
| } |
| } |
| for (size_t i = 0; i < dex_cache->NumResolvedMethods(); i++) { |
| AbstractMethod* 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++) { |
| Field* 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 (image_classes_ == NULL) { |
| return; |
| } |
| |
| Heap* heap = Runtime::Current()->GetHeap(); |
| Thread* self = Thread::Current(); |
| { |
| WriterMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| heap->FlushAllocStack(); |
| } |
| |
| ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); |
| heap->GetLiveBitmap()->Walk(CheckNonImageClassesRemovedCallback, this); |
| } |
| |
| void ImageWriter::CheckNonImageClassesRemovedCallback(Object* obj, void* arg) { |
| ImageWriter* image_writer = reinterpret_cast<ImageWriter*>(arg); |
| if (!obj->IsClass()) { |
| return; |
| } |
| 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() { |
| typedef std::set<std::string>::const_iterator It; // TODO: C++0x auto |
| for (It it = image_classes_->begin(), end = image_classes_->end(); it != end; ++it) { |
| LOG(INFO) << " " << *it; |
| } |
| } |
| |
| void ImageWriter::CalculateNewObjectOffsetsCallback(Object* obj, void* arg) { |
| DCHECK(obj != NULL); |
| DCHECK(arg != NULL); |
| ImageWriter* image_writer = reinterpret_cast<ImageWriter*>(arg); |
| |
| // 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 (image_writer->IsImageOffsetAssigned(obj)) { |
| DCHECK_EQ(obj, obj->AsString()->Intern()); |
| return; |
| } |
| SirtRef<String> interned(Thread::Current(), obj->AsString()->Intern()); |
| if (obj != interned.get()) { |
| if (!image_writer->IsImageOffsetAssigned(interned.get())) { |
| // interned obj is after us, allocate its location early |
| image_writer->AssignImageOffset(interned.get()); |
| } |
| // point those looking for this object to the interned version. |
| image_writer->SetImageOffset(obj, image_writer->GetImageOffset(interned.get())); |
| return; |
| } |
| // else (obj == interned), nothing to do but fall through to the normal case |
| } |
| |
| image_writer->AssignImageOffset(obj); |
| } |
| |
| ObjectArray<Object>* ImageWriter::CreateImageRoots() const { |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| Class* object_array_class = class_linker->FindSystemClass("[Ljava/lang/Object;"); |
| Thread* self = Thread::Current(); |
| |
| // build an Object[] of all the DexCaches used in the source_space_ |
| ObjectArray<Object>* dex_caches = ObjectArray<Object>::Alloc(self, object_array_class, |
| dex_caches_.size()); |
| int i = 0; |
| typedef Set::const_iterator It; // TODO: C++0x auto |
| for (It it = dex_caches_.begin(), end = dex_caches_.end(); it != end; ++it, ++i) { |
| dex_caches->Set(i, *it); |
| } |
| |
| // build an Object[] of the roots needed to restore the runtime |
| SirtRef<ObjectArray<Object> > |
| image_roots(self, |
| ObjectArray<Object>::Alloc(self, object_array_class, |
| ImageHeader::kImageRootsMax)); |
| image_roots->Set(ImageHeader::kJniStubArray, runtime->GetJniDlsymLookupStub()); |
| image_roots->Set(ImageHeader::kAbstractMethodErrorStubArray, |
| runtime->GetAbstractMethodErrorStubArray()); |
| image_roots->Set(ImageHeader::kStaticResolutionStubArray, |
| runtime->GetResolutionStubArray(Runtime::kStaticMethod)); |
| image_roots->Set(ImageHeader::kUnknownMethodResolutionStubArray, |
| runtime->GetResolutionStubArray(Runtime::kUnknownMethod)); |
| image_roots->Set(ImageHeader::kResolutionMethod, runtime->GetResolutionMethod()); |
| image_roots->Set(ImageHeader::kCalleeSaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kSaveAll)); |
| image_roots->Set(ImageHeader::kRefsOnlySaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)); |
| image_roots->Set(ImageHeader::kRefsAndArgsSaveMethod, |
| runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)); |
| image_roots->Set(ImageHeader::kOatLocation, |
| String::AllocFromModifiedUtf8(self, oat_file_->GetLocation().c_str())); |
| image_roots->Set(ImageHeader::kDexCaches, |
| dex_caches); |
| image_roots->Set(ImageHeader::kClassRoots, |
| class_linker->GetClassRoots()); |
| for (int i = 0; i < ImageHeader::kImageRootsMax; i++) { |
| CHECK(image_roots->Get(i) != NULL); |
| } |
| return image_roots.get(); |
| } |
| |
| void ImageWriter::CalculateNewObjectOffsets() { |
| Thread* self = Thread::Current(); |
| SirtRef<ObjectArray<Object> > image_roots(self, CreateImageRoots()); |
| |
| Heap* heap = Runtime::Current()->GetHeap(); |
| const Spaces& spaces = heap->GetSpaces(); |
| DCHECK(!spaces.empty()); |
| 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_); |
| heap->FlushAllocStack(); |
| // TODO: Image spaces only? |
| // TODO: Add InOrderWalk to heap bitmap. |
| const char* old = self->StartAssertNoThreadSuspension("ImageWriter"); |
| DCHECK(heap->GetLargeObjectsSpace()->GetLiveObjects()->IsEmpty()); |
| for (Spaces::const_iterator it = spaces.begin(); it != spaces.end(); ++it) { |
| (*it)->GetLiveBitmap()->InOrderWalk(CalculateNewObjectOffsetsCallback, this); |
| DCHECK_LT(image_end_, image_->Size()); |
| } |
| self->EndAssertNoThreadSuspension(old); |
| } |
| |
| // Note that image_top_ is left at end of used space |
| oat_begin_ = image_begin_ + RoundUp(image_end_, kPageSize); |
| const byte* oat_limit = oat_begin_ + oat_file_->Size(); |
| |
| // return to write header at start of image with future location of image_roots |
| ImageHeader image_header(reinterpret_cast<uint32_t>(image_begin_), |
| reinterpret_cast<uint32_t>(GetImageAddress(image_roots.get())), |
| oat_file_->GetOatHeader().GetChecksum(), |
| reinterpret_cast<uint32_t>(oat_begin_), |
| reinterpret_cast<uint32_t>(oat_limit)); |
| memcpy(image_->Begin(), &image_header, sizeof(image_header)); |
| } |
| |
| void ImageWriter::CopyAndFixupObjects() |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| Thread* self = Thread::Current(); |
| const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); |
| 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->FlushAllocStack(); |
| heap->GetLiveBitmap()->Walk(CopyAndFixupObjectsCallback, this); |
| self->EndAssertNoThreadSuspension(old_cause); |
| } |
| |
| void ImageWriter::CopyAndFixupObjectsCallback(Object* object, void* arg) { |
| DCHECK(object != NULL); |
| DCHECK(arg != NULL); |
| const Object* obj = object; |
| 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); |
| copy->monitor_ = 0; // We may have inflated the lock during compilation. |
| image_writer->FixupObject(obj, copy); |
| } |
| |
| void ImageWriter::FixupObject(const Object* orig, Object* copy) { |
| DCHECK(orig != NULL); |
| DCHECK(copy != NULL); |
| copy->SetClass(down_cast<Class*>(GetImageAddress(orig->GetClass()))); |
| // TODO: special case init of pointers to malloc data (or removal of these pointers) |
| if (orig->IsClass()) { |
| FixupClass(orig->AsClass(), down_cast<Class*>(copy)); |
| } else if (orig->IsObjectArray()) { |
| FixupObjectArray(orig->AsObjectArray<Object>(), down_cast<ObjectArray<Object>*>(copy)); |
| } else if (orig->IsMethod()) { |
| FixupMethod(orig->AsMethod(), down_cast<AbstractMethod*>(copy)); |
| } else { |
| FixupInstanceFields(orig, copy); |
| } |
| } |
| |
| void ImageWriter::FixupClass(const Class* orig, Class* copy) { |
| FixupInstanceFields(orig, copy); |
| FixupStaticFields(orig, copy); |
| } |
| |
| void ImageWriter::FixupMethod(const AbstractMethod* orig, AbstractMethod* copy) { |
| FixupInstanceFields(orig, copy); |
| |
| // OatWriter replaces the code_ and invoke_stub_ with offset values. |
| // Here we readjust to a pointer relative to oat_begin_ |
| |
| // Every type of method can have an invoke stub |
| uint32_t invoke_stub_offset = orig->GetOatInvokeStubOffset(); |
| const byte* invoke_stub = GetOatAddress(invoke_stub_offset); |
| copy->invoke_stub_ = reinterpret_cast<AbstractMethod::InvokeStub*>(const_cast<byte*>(invoke_stub)); |
| |
| if (orig->IsAbstract()) { |
| // Abstract methods are pointed to a stub that will throw AbstractMethodError if they are called |
| ByteArray* orig_ame_stub_array_ = Runtime::Current()->GetAbstractMethodErrorStubArray(); |
| ByteArray* copy_ame_stub_array_ = down_cast<ByteArray*>(GetImageAddress(orig_ame_stub_array_)); |
| copy->code_ = copy_ame_stub_array_->GetData(); |
| return; |
| } |
| |
| if (orig == Runtime::Current()->GetResolutionMethod()) { |
| // The resolution stub's code points at the unknown resolution trampoline |
| ByteArray* orig_res_stub_array_ = |
| Runtime::Current()->GetResolutionStubArray(Runtime::kUnknownMethod); |
| CHECK(orig->GetCode() == orig_res_stub_array_->GetData()); |
| ByteArray* copy_res_stub_array_ = down_cast<ByteArray*>(GetImageAddress(orig_res_stub_array_)); |
| copy->code_ = copy_res_stub_array_->GetData(); |
| return; |
| } |
| |
| // Non-abstract methods typically have code |
| uint32_t code_offset = orig->GetOatCodeOffset(); |
| const byte* code = NULL; |
| if (orig->IsStatic()) { |
| // Static methods may point at the resolution trampoline stub |
| ByteArray* orig_res_stub_array_ = |
| Runtime::Current()->GetResolutionStubArray(Runtime::kStaticMethod); |
| if (reinterpret_cast<int8_t*>(code_offset) == orig_res_stub_array_->GetData()) { |
| ByteArray* copy_res_stub_array_ = down_cast<ByteArray*>(GetImageAddress(orig_res_stub_array_)); |
| code = reinterpret_cast<const byte*>(copy_res_stub_array_->GetData()); |
| } |
| } |
| if (code == NULL) { |
| code = GetOatAddress(code_offset); |
| } |
| copy->code_ = code; |
| |
| if (orig->IsNative()) { |
| // The native method's pointer is directed to a stub to lookup via dlsym. |
| // Note this is not the code_ pointer, that is handled above. |
| ByteArray* orig_jni_stub_array_ = Runtime::Current()->GetJniDlsymLookupStub(); |
| ByteArray* copy_jni_stub_array_ = down_cast<ByteArray*>(GetImageAddress(orig_jni_stub_array_)); |
| copy->native_method_ = copy_jni_stub_array_->GetData(); |
| } else { |
| // normal (non-abstract non-native) methods have mapping tables to relocate |
| uint32_t mapping_table_off = orig->GetOatMappingTableOffset(); |
| const byte* mapping_table = GetOatAddress(mapping_table_off); |
| copy->mapping_table_ = reinterpret_cast<const uint32_t*>(mapping_table); |
| |
| uint32_t vmap_table_offset = orig->GetOatVmapTableOffset(); |
| const byte* vmap_table = GetOatAddress(vmap_table_offset); |
| copy->vmap_table_ = reinterpret_cast<const uint16_t*>(vmap_table); |
| |
| uint32_t native_gc_map_offset = orig->GetOatNativeGcMapOffset(); |
| const byte* native_gc_map = GetOatAddress(native_gc_map_offset); |
| copy->native_gc_map_ = reinterpret_cast<const uint8_t*>(native_gc_map); |
| } |
| } |
| |
| void ImageWriter::FixupObjectArray(const ObjectArray<Object>* orig, ObjectArray<Object>* copy) { |
| for (int32_t i = 0; i < orig->GetLength(); ++i) { |
| const Object* element = orig->Get(i); |
| copy->SetPtrWithoutChecks(i, GetImageAddress(element)); |
| } |
| } |
| |
| void ImageWriter::FixupInstanceFields(const 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(const Class* orig, Class* copy) { |
| DCHECK(orig != NULL); |
| DCHECK(copy != NULL); |
| FixupFields(orig, |
| copy, |
| orig->GetReferenceStaticOffsets(), |
| true); |
| } |
| |
| void ImageWriter::FixupFields(const 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); |
| const Object* ref = orig->GetFieldObject<const Object*>(byte_offset, false); |
| // Use SetFieldPtr to avoid card marking since we are writing to the image. |
| copy->SetFieldPtr(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 (const 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) { |
| Field* field = (is_static |
| ? klass->GetStaticField(i) |
| : klass->GetInstanceField(i)); |
| MemberOffset field_offset = field->GetOffset(); |
| const Object* ref = orig->GetFieldObject<const Object*>(field_offset, false); |
| // Use SetFieldPtr to avoid card marking since we are writing to the image. |
| copy->SetFieldPtr(field_offset, GetImageAddress(ref), false); |
| } |
| } |
| } |
| if (!is_static && orig->IsReferenceInstance()) { |
| // Fix-up referent, that isn't marked as an object field, for References. |
| Field* field = orig->GetClass()->FindInstanceField("referent", "Ljava/lang/Object;"); |
| MemberOffset field_offset = field->GetOffset(); |
| const Object* ref = orig->GetFieldObject<const Object*>(field_offset, false); |
| // Use SetFieldPtr to avoid card marking since we are writing to the image. |
| copy->SetFieldPtr(field_offset, GetImageAddress(ref), false); |
| } |
| } |
| |
| static AbstractMethod* GetTargetMethod(const Compiler::PatchInformation* patch) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| DexCache* dex_cache = class_linker->FindDexCache(patch->GetDexFile()); |
| AbstractMethod* method = class_linker->ResolveMethod(patch->GetDexFile(), |
| patch->GetTargetMethodIdx(), |
| dex_cache, |
| NULL, |
| 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; |
| } |
| |
| void ImageWriter::PatchOatCodeAndMethods(const Compiler& compiler) { |
| Thread* self = Thread::Current(); |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const char* old_cause = self->StartAssertNoThreadSuspension("ImageWriter"); |
| |
| typedef std::vector<const Compiler::PatchInformation*> Patches; |
| const Patches& code_to_patch = compiler.GetCodeToPatch(); |
| for (size_t i = 0; i < code_to_patch.size(); i++) { |
| const Compiler::PatchInformation* patch = code_to_patch[i]; |
| AbstractMethod* target = GetTargetMethod(patch); |
| uint32_t code = reinterpret_cast<uint32_t>(class_linker->GetOatCodeFor(target)); |
| uint32_t code_base = reinterpret_cast<uint32_t>(&oat_file_->GetOatHeader()); |
| uint32_t code_offset = code - code_base; |
| SetPatchLocation(patch, reinterpret_cast<uint32_t>(GetOatAddress(code_offset))); |
| } |
| |
| const Patches& methods_to_patch = compiler.GetMethodsToPatch(); |
| for (size_t i = 0; i < methods_to_patch.size(); i++) { |
| const Compiler::PatchInformation* patch = methods_to_patch[i]; |
| AbstractMethod* target = GetTargetMethod(patch); |
| SetPatchLocation(patch, reinterpret_cast<uint32_t>(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 Compiler::PatchInformation* patch, uint32_t value) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const void* oat_code = class_linker->GetOatCodeFor(patch->GetDexFile(), |
| 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<uint32_t>(oat_code) & ~0x1); |
| uint32_t* patch_location = reinterpret_cast<uint32_t*>(base + patch->GetLiteralOffset()); |
| #ifndef NDEBUG |
| const DexFile::MethodId& id = patch->GetDexFile().GetMethodId(patch->GetTargetMethodIdx()); |
| uint32_t expected = reinterpret_cast<uint32_t>(&id); |
| uint32_t actual = *patch_location; |
| CHECK(actual == expected || actual == value) << std::hex |
| << "actual=" << actual |
| << "expected=" << expected |
| << "value=" << value; |
| #endif |
| *patch_location = value; |
| oat_header.UpdateChecksum(patch_location, sizeof(value)); |
| } |
| |
| } // namespace art |