| /* |
| * Copyright (C) 2016 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 "verifier_deps.h" |
| |
| #include <cstring> |
| |
| #include "base/stl_util.h" |
| #include "compiler_callbacks.h" |
| #include "leb128.h" |
| #include "mirror/class-inl.h" |
| #include "obj_ptr-inl.h" |
| #include "runtime.h" |
| |
| namespace art { |
| namespace verifier { |
| |
| VerifierDeps::VerifierDeps(const std::vector<const DexFile*>& dex_files) { |
| for (const DexFile* dex_file : dex_files) { |
| DCHECK(GetDexFileDeps(*dex_file) == nullptr); |
| std::unique_ptr<DexFileDeps> deps(new DexFileDeps()); |
| dex_deps_.emplace(dex_file, std::move(deps)); |
| } |
| } |
| |
| void VerifierDeps::MergeWith(const VerifierDeps& other, |
| const std::vector<const DexFile*>& dex_files) { |
| DCHECK(dex_deps_.size() == other.dex_deps_.size()); |
| for (const DexFile* dex_file : dex_files) { |
| DexFileDeps* my_deps = GetDexFileDeps(*dex_file); |
| const DexFileDeps& other_deps = *other.GetDexFileDeps(*dex_file); |
| // We currently collect extra strings only on the main `VerifierDeps`, |
| // which should be the one passed as `this` in this method. |
| DCHECK(other_deps.strings_.empty()); |
| MergeSets(my_deps->assignable_types_, other_deps.assignable_types_); |
| MergeSets(my_deps->unassignable_types_, other_deps.unassignable_types_); |
| MergeSets(my_deps->classes_, other_deps.classes_); |
| MergeSets(my_deps->fields_, other_deps.fields_); |
| MergeSets(my_deps->direct_methods_, other_deps.direct_methods_); |
| MergeSets(my_deps->virtual_methods_, other_deps.virtual_methods_); |
| MergeSets(my_deps->interface_methods_, other_deps.interface_methods_); |
| for (dex::TypeIndex entry : other_deps.unverified_classes_) { |
| my_deps->unverified_classes_.push_back(entry); |
| } |
| } |
| } |
| |
| VerifierDeps::DexFileDeps* VerifierDeps::GetDexFileDeps(const DexFile& dex_file) { |
| auto it = dex_deps_.find(&dex_file); |
| return (it == dex_deps_.end()) ? nullptr : it->second.get(); |
| } |
| |
| const VerifierDeps::DexFileDeps* VerifierDeps::GetDexFileDeps(const DexFile& dex_file) const { |
| auto it = dex_deps_.find(&dex_file); |
| return (it == dex_deps_.end()) ? nullptr : it->second.get(); |
| } |
| |
| // Access flags that impact vdex verification. |
| static constexpr uint32_t kAccVdexAccessFlags = |
| kAccPublic | kAccPrivate | kAccProtected | kAccStatic | kAccInterface; |
| |
| template <typename T> |
| uint16_t VerifierDeps::GetAccessFlags(T* element) { |
| static_assert(kAccJavaFlagsMask == 0xFFFF, "Unexpected value of a constant"); |
| if (element == nullptr) { |
| return VerifierDeps::kUnresolvedMarker; |
| } else { |
| uint16_t access_flags = Low16Bits(element->GetAccessFlags()) & kAccVdexAccessFlags; |
| CHECK_NE(access_flags, VerifierDeps::kUnresolvedMarker); |
| return access_flags; |
| } |
| } |
| |
| dex::StringIndex VerifierDeps::GetClassDescriptorStringId(const DexFile& dex_file, |
| ObjPtr<mirror::Class> klass) { |
| DCHECK(klass != nullptr); |
| ObjPtr<mirror::DexCache> dex_cache = klass->GetDexCache(); |
| // Array and proxy classes do not have a dex cache. |
| if (!klass->IsArrayClass() && !klass->IsProxyClass()) { |
| DCHECK(dex_cache != nullptr) << klass->PrettyClass(); |
| if (dex_cache->GetDexFile() == &dex_file) { |
| // FindStringId is slow, try to go through the class def if we have one. |
| const DexFile::ClassDef* class_def = klass->GetClassDef(); |
| DCHECK(class_def != nullptr) << klass->PrettyClass(); |
| const DexFile::TypeId& type_id = dex_file.GetTypeId(class_def->class_idx_); |
| if (kIsDebugBuild) { |
| std::string temp; |
| CHECK_EQ(GetIdFromString(dex_file, klass->GetDescriptor(&temp)), type_id.descriptor_idx_); |
| } |
| return type_id.descriptor_idx_; |
| } |
| } |
| std::string temp; |
| return GetIdFromString(dex_file, klass->GetDescriptor(&temp)); |
| } |
| |
| // Try to find the string descriptor of the class. type_idx is a best guess of a matching string id. |
| static dex::StringIndex TryGetClassDescriptorStringId(const DexFile& dex_file, |
| dex::TypeIndex type_idx, |
| ObjPtr<mirror::Class> klass) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (!klass->IsArrayClass()) { |
| const DexFile::TypeId& type_id = dex_file.GetTypeId(type_idx); |
| const DexFile& klass_dex = klass->GetDexFile(); |
| const DexFile::TypeId& klass_type_id = klass_dex.GetTypeId(klass->GetClassDef()->class_idx_); |
| if (strcmp(dex_file.GetTypeDescriptor(type_id), |
| klass_dex.GetTypeDescriptor(klass_type_id)) == 0) { |
| return type_id.descriptor_idx_; |
| } |
| } |
| return dex::StringIndex::Invalid(); |
| } |
| |
| dex::StringIndex VerifierDeps::GetMethodDeclaringClassStringId(const DexFile& dex_file, |
| uint32_t dex_method_index, |
| ArtMethod* method) { |
| static_assert(kAccJavaFlagsMask == 0xFFFF, "Unexpected value of a constant"); |
| if (method == nullptr) { |
| return dex::StringIndex(VerifierDeps::kUnresolvedMarker); |
| } |
| const dex::StringIndex string_id = TryGetClassDescriptorStringId( |
| dex_file, |
| dex_file.GetMethodId(dex_method_index).class_idx_, |
| method->GetDeclaringClass()); |
| if (string_id.IsValid()) { |
| // Got lucky using the original dex file, return based on the input dex file. |
| DCHECK_EQ(GetClassDescriptorStringId(dex_file, method->GetDeclaringClass()), string_id); |
| return string_id; |
| } |
| return GetClassDescriptorStringId(dex_file, method->GetDeclaringClass()); |
| } |
| |
| dex::StringIndex VerifierDeps::GetFieldDeclaringClassStringId(const DexFile& dex_file, |
| uint32_t dex_field_idx, |
| ArtField* field) { |
| static_assert(kAccJavaFlagsMask == 0xFFFF, "Unexpected value of a constant"); |
| if (field == nullptr) { |
| return dex::StringIndex(VerifierDeps::kUnresolvedMarker); |
| } |
| const dex::StringIndex string_id = TryGetClassDescriptorStringId( |
| dex_file, |
| dex_file.GetFieldId(dex_field_idx).class_idx_, |
| field->GetDeclaringClass()); |
| if (string_id.IsValid()) { |
| // Got lucky using the original dex file, return based on the input dex file. |
| DCHECK_EQ(GetClassDescriptorStringId(dex_file, field->GetDeclaringClass()), string_id); |
| return string_id; |
| } |
| return GetClassDescriptorStringId(dex_file, field->GetDeclaringClass()); |
| } |
| |
| static inline VerifierDeps* GetMainVerifierDeps() { |
| // The main VerifierDeps is the one set in the compiler callbacks, which at the |
| // end of verification will have all the per-thread VerifierDeps merged into it. |
| CompilerCallbacks* callbacks = Runtime::Current()->GetCompilerCallbacks(); |
| if (callbacks == nullptr) { |
| return nullptr; |
| } |
| return callbacks->GetVerifierDeps(); |
| } |
| |
| static inline VerifierDeps* GetThreadLocalVerifierDeps() { |
| // During AOT, each thread has its own VerifierDeps, to avoid lock contention. At the end |
| // of full verification, these VerifierDeps will be merged into the main one. |
| if (!Runtime::Current()->IsAotCompiler()) { |
| return nullptr; |
| } |
| return Thread::Current()->GetVerifierDeps(); |
| } |
| |
| static bool FindExistingStringId(const std::vector<std::string>& strings, |
| const std::string& str, |
| uint32_t* found_id) { |
| uint32_t num_extra_ids = strings.size(); |
| for (size_t i = 0; i < num_extra_ids; ++i) { |
| if (strings[i] == str) { |
| *found_id = i; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| dex::StringIndex VerifierDeps::GetIdFromString(const DexFile& dex_file, const std::string& str) { |
| const DexFile::StringId* string_id = dex_file.FindStringId(str.c_str()); |
| if (string_id != nullptr) { |
| // String is in the DEX file. Return its ID. |
| return dex_file.GetIndexForStringId(*string_id); |
| } |
| |
| // String is not in the DEX file. Assign a new ID to it which is higher than |
| // the number of strings in the DEX file. |
| |
| // We use the main `VerifierDeps` for adding new strings to simplify |
| // synchronization/merging of these entries between threads. |
| VerifierDeps* singleton = GetMainVerifierDeps(); |
| DexFileDeps* deps = singleton->GetDexFileDeps(dex_file); |
| DCHECK(deps != nullptr); |
| |
| uint32_t num_ids_in_dex = dex_file.NumStringIds(); |
| uint32_t found_id; |
| |
| { |
| ReaderMutexLock mu(Thread::Current(), *Locks::verifier_deps_lock_); |
| if (FindExistingStringId(deps->strings_, str, &found_id)) { |
| return dex::StringIndex(num_ids_in_dex + found_id); |
| } |
| } |
| { |
| WriterMutexLock mu(Thread::Current(), *Locks::verifier_deps_lock_); |
| if (FindExistingStringId(deps->strings_, str, &found_id)) { |
| return dex::StringIndex(num_ids_in_dex + found_id); |
| } |
| deps->strings_.push_back(str); |
| dex::StringIndex new_id(num_ids_in_dex + deps->strings_.size() - 1); |
| CHECK_GE(new_id.index_, num_ids_in_dex); // check for overflows |
| DCHECK_EQ(str, singleton->GetStringFromId(dex_file, new_id)); |
| return new_id; |
| } |
| } |
| |
| std::string VerifierDeps::GetStringFromId(const DexFile& dex_file, dex::StringIndex string_id) |
| const { |
| uint32_t num_ids_in_dex = dex_file.NumStringIds(); |
| if (string_id.index_ < num_ids_in_dex) { |
| return std::string(dex_file.StringDataByIdx(string_id)); |
| } else { |
| const DexFileDeps* deps = GetDexFileDeps(dex_file); |
| DCHECK(deps != nullptr); |
| string_id.index_ -= num_ids_in_dex; |
| CHECK_LT(string_id.index_, deps->strings_.size()); |
| return deps->strings_[string_id.index_]; |
| } |
| } |
| |
| bool VerifierDeps::IsInClassPath(ObjPtr<mirror::Class> klass) const { |
| DCHECK(klass != nullptr); |
| |
| // For array types, we return whether the non-array component type |
| // is in the classpath. |
| while (klass->IsArrayClass()) { |
| klass = klass->GetComponentType(); |
| } |
| |
| if (klass->IsPrimitive()) { |
| return true; |
| } |
| |
| ObjPtr<mirror::DexCache> dex_cache = klass->GetDexCache(); |
| DCHECK(dex_cache != nullptr); |
| const DexFile* dex_file = dex_cache->GetDexFile(); |
| DCHECK(dex_file != nullptr); |
| |
| // Test if the `dex_deps_` contains an entry for `dex_file`. If not, the dex |
| // file was not registered as being compiled and we assume `klass` is in the |
| // classpath. |
| return (GetDexFileDeps(*dex_file) == nullptr); |
| } |
| |
| void VerifierDeps::AddClassResolution(const DexFile& dex_file, |
| dex::TypeIndex type_idx, |
| mirror::Class* klass) { |
| DexFileDeps* dex_deps = GetDexFileDeps(dex_file); |
| if (dex_deps == nullptr) { |
| // This invocation is from verification of a dex file which is not being compiled. |
| return; |
| } |
| |
| if (klass != nullptr && !IsInClassPath(klass)) { |
| // Class resolved into one of the DEX files which are being compiled. |
| // This is not a classpath dependency. |
| return; |
| } |
| |
| dex_deps->classes_.emplace(ClassResolution(type_idx, GetAccessFlags(klass))); |
| } |
| |
| void VerifierDeps::AddFieldResolution(const DexFile& dex_file, |
| uint32_t field_idx, |
| ArtField* field) { |
| DexFileDeps* dex_deps = GetDexFileDeps(dex_file); |
| if (dex_deps == nullptr) { |
| // This invocation is from verification of a dex file which is not being compiled. |
| return; |
| } |
| |
| if (field != nullptr && !IsInClassPath(field->GetDeclaringClass())) { |
| // Field resolved into one of the DEX files which are being compiled. |
| // This is not a classpath dependency. |
| return; |
| } |
| |
| dex_deps->fields_.emplace(FieldResolution(field_idx, |
| GetAccessFlags(field), |
| GetFieldDeclaringClassStringId(dex_file, |
| field_idx, |
| field))); |
| } |
| |
| void VerifierDeps::AddMethodResolution(const DexFile& dex_file, |
| uint32_t method_idx, |
| MethodResolutionKind resolution_kind, |
| ArtMethod* method) { |
| DexFileDeps* dex_deps = GetDexFileDeps(dex_file); |
| if (dex_deps == nullptr) { |
| // This invocation is from verification of a dex file which is not being compiled. |
| return; |
| } |
| |
| if (method != nullptr && !IsInClassPath(method->GetDeclaringClass())) { |
| // Method resolved into one of the DEX files which are being compiled. |
| // This is not a classpath dependency. |
| return; |
| } |
| |
| MethodResolution method_tuple(method_idx, |
| GetAccessFlags(method), |
| GetMethodDeclaringClassStringId(dex_file, method_idx, method)); |
| if (resolution_kind == kDirectMethodResolution) { |
| dex_deps->direct_methods_.emplace(method_tuple); |
| } else if (resolution_kind == kVirtualMethodResolution) { |
| dex_deps->virtual_methods_.emplace(method_tuple); |
| } else { |
| DCHECK_EQ(resolution_kind, kInterfaceMethodResolution); |
| dex_deps->interface_methods_.emplace(method_tuple); |
| } |
| } |
| |
| mirror::Class* VerifierDeps::FindOneClassPathBoundaryForInterface(mirror::Class* destination, |
| mirror::Class* source) const { |
| DCHECK(destination->IsInterface()); |
| DCHECK(IsInClassPath(destination)); |
| Thread* thread = Thread::Current(); |
| mirror::Class* current = source; |
| // Record the classes that are at the boundary between the compiled DEX files and |
| // the classpath. We will check those classes later to find one class that inherits |
| // `destination`. |
| std::vector<ObjPtr<mirror::Class>> boundaries; |
| // If the destination is a direct interface of a class defined in the DEX files being |
| // compiled, no need to record it. |
| while (!IsInClassPath(current)) { |
| for (size_t i = 0; i < current->NumDirectInterfaces(); ++i) { |
| ObjPtr<mirror::Class> direct = mirror::Class::GetDirectInterface(thread, current, i); |
| if (direct == destination) { |
| return nullptr; |
| } else if (IsInClassPath(direct)) { |
| boundaries.push_back(direct); |
| } |
| } |
| current = current->GetSuperClass(); |
| } |
| DCHECK(current != nullptr); |
| boundaries.push_back(current); |
| |
| // Check if we have an interface defined in the DEX files being compiled, direclty |
| // inheriting `destination`. |
| int32_t iftable_count = source->GetIfTableCount(); |
| ObjPtr<mirror::IfTable> iftable = source->GetIfTable(); |
| for (int32_t i = 0; i < iftable_count; ++i) { |
| mirror::Class* itf = iftable->GetInterface(i); |
| if (!IsInClassPath(itf)) { |
| for (size_t j = 0; j < itf->NumDirectInterfaces(); ++j) { |
| ObjPtr<mirror::Class> direct = mirror::Class::GetDirectInterface(thread, itf, j); |
| if (direct == destination) { |
| return nullptr; |
| } else if (IsInClassPath(direct)) { |
| boundaries.push_back(direct); |
| } |
| } |
| } |
| } |
| |
| // Find a boundary making `source` inherit from `destination`. We must find one. |
| for (const ObjPtr<mirror::Class>& boundary : boundaries) { |
| if (destination->IsAssignableFrom(boundary)) { |
| return boundary.Ptr(); |
| } |
| } |
| LOG(FATAL) << "Should have found a classpath boundary"; |
| UNREACHABLE(); |
| } |
| |
| void VerifierDeps::AddAssignability(const DexFile& dex_file, |
| mirror::Class* destination, |
| mirror::Class* source, |
| bool is_strict, |
| bool is_assignable) { |
| // Test that the method is only called on reference types. |
| // Note that concurrent verification of `destination` and `source` may have |
| // set their status to erroneous. However, the tests performed below rely |
| // merely on no issues with linking (valid access flags, superclass and |
| // implemented interfaces). If the class at any point reached the IsResolved |
| // status, the requirement holds. This is guaranteed by RegTypeCache::ResolveClass. |
| DCHECK(destination != nullptr); |
| DCHECK(source != nullptr); |
| |
| if (destination->IsPrimitive() || source->IsPrimitive()) { |
| // Primitive types are trivially non-assignable to anything else. |
| // We do not need to record trivial assignability, as it will |
| // not change across releases. |
| return; |
| } |
| |
| if (source->IsObjectClass() && !is_assignable) { |
| // j.l.Object is trivially non-assignable to other types, don't |
| // record it. |
| return; |
| } |
| |
| if (destination == source || |
| destination->IsObjectClass() || |
| (!is_strict && destination->IsInterface())) { |
| // Cases when `destination` is trivially assignable from `source`. |
| DCHECK(is_assignable); |
| return; |
| } |
| |
| DCHECK_EQ(is_assignable, destination->IsAssignableFrom(source)); |
| |
| if (destination->IsArrayClass() && source->IsArrayClass()) { |
| // Both types are arrays. Break down to component types and add recursively. |
| // This helps filter out destinations from compiled DEX files (see below) |
| // and deduplicate entries with the same canonical component type. |
| mirror::Class* destination_component = destination->GetComponentType(); |
| mirror::Class* source_component = source->GetComponentType(); |
| |
| // Only perform the optimization if both types are resolved which guarantees |
| // that they linked successfully, as required at the top of this method. |
| if (destination_component->IsResolved() && source_component->IsResolved()) { |
| AddAssignability(dex_file, |
| destination_component, |
| source_component, |
| /* is_strict */ true, |
| is_assignable); |
| return; |
| } |
| } |
| |
| DexFileDeps* dex_deps = GetDexFileDeps(dex_file); |
| if (dex_deps == nullptr) { |
| // This invocation is from verification of a DEX file which is not being compiled. |
| return; |
| } |
| |
| if (!IsInClassPath(destination) && !IsInClassPath(source)) { |
| // Both `destination` and `source` are defined in the compiled DEX files. |
| // No need to record a dependency. |
| return; |
| } |
| |
| if (!IsInClassPath(source)) { |
| if (!destination->IsInterface()) { |
| DCHECK(!source->IsInterface()); |
| // Find the super class at the classpath boundary. Only that class |
| // can change the assignability. |
| do { |
| source = source->GetSuperClass(); |
| } while (!IsInClassPath(source)); |
| |
| // If that class is the actual destination, no need to record it. |
| if (source == destination) { |
| return; |
| } |
| } else if (is_assignable) { |
| source = FindOneClassPathBoundaryForInterface(destination, source); |
| if (source == nullptr) { |
| // There was no classpath boundary, no need to record. |
| return; |
| } |
| DCHECK(IsInClassPath(source)); |
| } |
| } |
| |
| |
| // Get string IDs for both descriptors and store in the appropriate set. |
| dex::StringIndex destination_id = GetClassDescriptorStringId(dex_file, destination); |
| dex::StringIndex source_id = GetClassDescriptorStringId(dex_file, source); |
| |
| if (is_assignable) { |
| dex_deps->assignable_types_.emplace(TypeAssignability(destination_id, source_id)); |
| } else { |
| dex_deps->unassignable_types_.emplace(TypeAssignability(destination_id, source_id)); |
| } |
| } |
| |
| void VerifierDeps::MaybeRecordVerificationStatus(const DexFile& dex_file, |
| dex::TypeIndex type_idx, |
| MethodVerifier::FailureKind failure_kind) { |
| if (failure_kind == MethodVerifier::kNoFailure) { |
| // We only record classes that did not fully verify at compile time. |
| return; |
| } |
| |
| VerifierDeps* thread_deps = GetThreadLocalVerifierDeps(); |
| if (thread_deps != nullptr) { |
| DexFileDeps* dex_deps = thread_deps->GetDexFileDeps(dex_file); |
| dex_deps->unverified_classes_.push_back(type_idx); |
| } |
| } |
| |
| void VerifierDeps::MaybeRecordClassResolution(const DexFile& dex_file, |
| dex::TypeIndex type_idx, |
| mirror::Class* klass) { |
| VerifierDeps* thread_deps = GetThreadLocalVerifierDeps(); |
| if (thread_deps != nullptr) { |
| thread_deps->AddClassResolution(dex_file, type_idx, klass); |
| } |
| } |
| |
| void VerifierDeps::MaybeRecordFieldResolution(const DexFile& dex_file, |
| uint32_t field_idx, |
| ArtField* field) { |
| VerifierDeps* thread_deps = GetThreadLocalVerifierDeps(); |
| if (thread_deps != nullptr) { |
| thread_deps->AddFieldResolution(dex_file, field_idx, field); |
| } |
| } |
| |
| void VerifierDeps::MaybeRecordMethodResolution(const DexFile& dex_file, |
| uint32_t method_idx, |
| MethodResolutionKind resolution_kind, |
| ArtMethod* method) { |
| VerifierDeps* thread_deps = GetThreadLocalVerifierDeps(); |
| if (thread_deps != nullptr) { |
| thread_deps->AddMethodResolution(dex_file, method_idx, resolution_kind, method); |
| } |
| } |
| |
| void VerifierDeps::MaybeRecordAssignability(const DexFile& dex_file, |
| mirror::Class* destination, |
| mirror::Class* source, |
| bool is_strict, |
| bool is_assignable) { |
| VerifierDeps* thread_deps = GetThreadLocalVerifierDeps(); |
| if (thread_deps != nullptr) { |
| thread_deps->AddAssignability(dex_file, destination, source, is_strict, is_assignable); |
| } |
| } |
| |
| namespace { |
| |
| static inline uint32_t DecodeUint32WithOverflowCheck(const uint8_t** in, const uint8_t* end) { |
| CHECK_LT(*in, end); |
| return DecodeUnsignedLeb128(in); |
| } |
| |
| template<typename T> inline uint32_t Encode(T in); |
| |
| template<> inline uint32_t Encode<uint16_t>(uint16_t in) { |
| return in; |
| } |
| template<> inline uint32_t Encode<uint32_t>(uint32_t in) { |
| return in; |
| } |
| template<> inline uint32_t Encode<dex::TypeIndex>(dex::TypeIndex in) { |
| return in.index_; |
| } |
| template<> inline uint32_t Encode<dex::StringIndex>(dex::StringIndex in) { |
| return in.index_; |
| } |
| |
| template<typename T> inline T Decode(uint32_t in); |
| |
| template<> inline uint16_t Decode<uint16_t>(uint32_t in) { |
| return dchecked_integral_cast<uint16_t>(in); |
| } |
| template<> inline uint32_t Decode<uint32_t>(uint32_t in) { |
| return in; |
| } |
| template<> inline dex::TypeIndex Decode<dex::TypeIndex>(uint32_t in) { |
| return dex::TypeIndex(in); |
| } |
| template<> inline dex::StringIndex Decode<dex::StringIndex>(uint32_t in) { |
| return dex::StringIndex(in); |
| } |
| |
| template<typename T1, typename T2> |
| static inline void EncodeTuple(std::vector<uint8_t>* out, const std::tuple<T1, T2>& t) { |
| EncodeUnsignedLeb128(out, Encode(std::get<0>(t))); |
| EncodeUnsignedLeb128(out, Encode(std::get<1>(t))); |
| } |
| |
| template<typename T1, typename T2> |
| static inline void DecodeTuple(const uint8_t** in, const uint8_t* end, std::tuple<T1, T2>* t) { |
| T1 v1 = Decode<T1>(DecodeUint32WithOverflowCheck(in, end)); |
| T2 v2 = Decode<T2>(DecodeUint32WithOverflowCheck(in, end)); |
| *t = std::make_tuple(v1, v2); |
| } |
| |
| template<typename T1, typename T2, typename T3> |
| static inline void EncodeTuple(std::vector<uint8_t>* out, const std::tuple<T1, T2, T3>& t) { |
| EncodeUnsignedLeb128(out, Encode(std::get<0>(t))); |
| EncodeUnsignedLeb128(out, Encode(std::get<1>(t))); |
| EncodeUnsignedLeb128(out, Encode(std::get<2>(t))); |
| } |
| |
| template<typename T1, typename T2, typename T3> |
| static inline void DecodeTuple(const uint8_t** in, const uint8_t* end, std::tuple<T1, T2, T3>* t) { |
| T1 v1 = Decode<T1>(DecodeUint32WithOverflowCheck(in, end)); |
| T2 v2 = Decode<T2>(DecodeUint32WithOverflowCheck(in, end)); |
| T3 v3 = Decode<T3>(DecodeUint32WithOverflowCheck(in, end)); |
| *t = std::make_tuple(v1, v2, v3); |
| } |
| |
| template<typename T> |
| static inline void EncodeSet(std::vector<uint8_t>* out, const std::set<T>& set) { |
| EncodeUnsignedLeb128(out, set.size()); |
| for (const T& entry : set) { |
| EncodeTuple(out, entry); |
| } |
| } |
| |
| template <typename T> |
| static inline void EncodeUint16Vector(std::vector<uint8_t>* out, |
| const std::vector<T>& vector) { |
| EncodeUnsignedLeb128(out, vector.size()); |
| for (const T& entry : vector) { |
| EncodeUnsignedLeb128(out, Encode(entry)); |
| } |
| } |
| |
| template<typename T> |
| static inline void DecodeSet(const uint8_t** in, const uint8_t* end, std::set<T>* set) { |
| DCHECK(set->empty()); |
| size_t num_entries = DecodeUint32WithOverflowCheck(in, end); |
| for (size_t i = 0; i < num_entries; ++i) { |
| T tuple; |
| DecodeTuple(in, end, &tuple); |
| set->emplace(tuple); |
| } |
| } |
| |
| template<typename T> |
| static inline void DecodeUint16Vector(const uint8_t** in, |
| const uint8_t* end, |
| std::vector<T>* vector) { |
| DCHECK(vector->empty()); |
| size_t num_entries = DecodeUint32WithOverflowCheck(in, end); |
| vector->reserve(num_entries); |
| for (size_t i = 0; i < num_entries; ++i) { |
| vector->push_back( |
| Decode<T>(dchecked_integral_cast<uint16_t>(DecodeUint32WithOverflowCheck(in, end)))); |
| } |
| } |
| |
| static inline void EncodeStringVector(std::vector<uint8_t>* out, |
| const std::vector<std::string>& strings) { |
| EncodeUnsignedLeb128(out, strings.size()); |
| for (const std::string& str : strings) { |
| const uint8_t* data = reinterpret_cast<const uint8_t*>(str.c_str()); |
| size_t length = str.length() + 1; |
| out->insert(out->end(), data, data + length); |
| DCHECK_EQ(0u, out->back()); |
| } |
| } |
| |
| static inline void DecodeStringVector(const uint8_t** in, |
| const uint8_t* end, |
| std::vector<std::string>* strings) { |
| DCHECK(strings->empty()); |
| size_t num_strings = DecodeUint32WithOverflowCheck(in, end); |
| strings->reserve(num_strings); |
| for (size_t i = 0; i < num_strings; ++i) { |
| CHECK_LT(*in, end); |
| const char* string_start = reinterpret_cast<const char*>(*in); |
| strings->emplace_back(std::string(string_start)); |
| *in += strings->back().length() + 1; |
| } |
| } |
| |
| } // namespace |
| |
| void VerifierDeps::Encode(const std::vector<const DexFile*>& dex_files, |
| std::vector<uint8_t>* buffer) const { |
| for (const DexFile* dex_file : dex_files) { |
| const DexFileDeps& deps = *GetDexFileDeps(*dex_file); |
| EncodeStringVector(buffer, deps.strings_); |
| EncodeSet(buffer, deps.assignable_types_); |
| EncodeSet(buffer, deps.unassignable_types_); |
| EncodeSet(buffer, deps.classes_); |
| EncodeSet(buffer, deps.fields_); |
| EncodeSet(buffer, deps.direct_methods_); |
| EncodeSet(buffer, deps.virtual_methods_); |
| EncodeSet(buffer, deps.interface_methods_); |
| EncodeUint16Vector(buffer, deps.unverified_classes_); |
| } |
| } |
| |
| VerifierDeps::VerifierDeps(const std::vector<const DexFile*>& dex_files, |
| ArrayRef<const uint8_t> data) |
| : VerifierDeps(dex_files) { |
| if (data.empty()) { |
| // Return eagerly, as the first thing we expect from VerifierDeps data is |
| // the number of created strings, even if there is no dependency. |
| // Currently, only the boot image does not have any VerifierDeps data. |
| return; |
| } |
| const uint8_t* data_start = data.data(); |
| const uint8_t* data_end = data_start + data.size(); |
| for (const DexFile* dex_file : dex_files) { |
| DexFileDeps* deps = GetDexFileDeps(*dex_file); |
| DecodeStringVector(&data_start, data_end, &deps->strings_); |
| DecodeSet(&data_start, data_end, &deps->assignable_types_); |
| DecodeSet(&data_start, data_end, &deps->unassignable_types_); |
| DecodeSet(&data_start, data_end, &deps->classes_); |
| DecodeSet(&data_start, data_end, &deps->fields_); |
| DecodeSet(&data_start, data_end, &deps->direct_methods_); |
| DecodeSet(&data_start, data_end, &deps->virtual_methods_); |
| DecodeSet(&data_start, data_end, &deps->interface_methods_); |
| DecodeUint16Vector(&data_start, data_end, &deps->unverified_classes_); |
| } |
| CHECK_LE(data_start, data_end); |
| } |
| |
| bool VerifierDeps::Equals(const VerifierDeps& rhs) const { |
| if (dex_deps_.size() != rhs.dex_deps_.size()) { |
| return false; |
| } |
| |
| auto lhs_it = dex_deps_.begin(); |
| auto rhs_it = rhs.dex_deps_.begin(); |
| |
| for (; (lhs_it != dex_deps_.end()) && (rhs_it != rhs.dex_deps_.end()); lhs_it++, rhs_it++) { |
| const DexFile* lhs_dex_file = lhs_it->first; |
| const DexFile* rhs_dex_file = rhs_it->first; |
| if (lhs_dex_file != rhs_dex_file) { |
| return false; |
| } |
| |
| DexFileDeps* lhs_deps = lhs_it->second.get(); |
| DexFileDeps* rhs_deps = rhs_it->second.get(); |
| if (!lhs_deps->Equals(*rhs_deps)) { |
| return false; |
| } |
| } |
| |
| DCHECK((lhs_it == dex_deps_.end()) && (rhs_it == rhs.dex_deps_.end())); |
| return true; |
| } |
| |
| bool VerifierDeps::DexFileDeps::Equals(const VerifierDeps::DexFileDeps& rhs) const { |
| return (strings_ == rhs.strings_) && |
| (assignable_types_ == rhs.assignable_types_) && |
| (unassignable_types_ == rhs.unassignable_types_) && |
| (classes_ == rhs.classes_) && |
| (fields_ == rhs.fields_) && |
| (direct_methods_ == rhs.direct_methods_) && |
| (virtual_methods_ == rhs.virtual_methods_) && |
| (interface_methods_ == rhs.interface_methods_) && |
| (unverified_classes_ == rhs.unverified_classes_); |
| } |
| |
| void VerifierDeps::Dump(VariableIndentationOutputStream* vios) const { |
| for (const auto& dep : dex_deps_) { |
| const DexFile& dex_file = *dep.first; |
| vios->Stream() |
| << "Dependencies of " |
| << dex_file.GetLocation() |
| << ":\n"; |
| |
| ScopedIndentation indent(vios); |
| |
| for (const std::string& str : dep.second->strings_) { |
| vios->Stream() << "Extra string: " << str << "\n"; |
| } |
| |
| for (const TypeAssignability& entry : dep.second->assignable_types_) { |
| vios->Stream() |
| << GetStringFromId(dex_file, entry.GetSource()) |
| << " must be assignable to " |
| << GetStringFromId(dex_file, entry.GetDestination()) |
| << "\n"; |
| } |
| |
| for (const TypeAssignability& entry : dep.second->unassignable_types_) { |
| vios->Stream() |
| << GetStringFromId(dex_file, entry.GetSource()) |
| << " must not be assignable to " |
| << GetStringFromId(dex_file, entry.GetDestination()) |
| << "\n"; |
| } |
| |
| for (const ClassResolution& entry : dep.second->classes_) { |
| vios->Stream() |
| << dex_file.StringByTypeIdx(entry.GetDexTypeIndex()) |
| << (entry.IsResolved() ? " must be resolved " : "must not be resolved ") |
| << " with access flags " << std::hex << entry.GetAccessFlags() << std::dec |
| << "\n"; |
| } |
| |
| for (const FieldResolution& entry : dep.second->fields_) { |
| const DexFile::FieldId& field_id = dex_file.GetFieldId(entry.GetDexFieldIndex()); |
| vios->Stream() |
| << dex_file.GetFieldDeclaringClassDescriptor(field_id) << "->" |
| << dex_file.GetFieldName(field_id) << ":" |
| << dex_file.GetFieldTypeDescriptor(field_id) |
| << " is expected to be "; |
| if (!entry.IsResolved()) { |
| vios->Stream() << "unresolved\n"; |
| } else { |
| vios->Stream() |
| << "in class " |
| << GetStringFromId(dex_file, entry.GetDeclaringClassIndex()) |
| << ", and have the access flags " << std::hex << entry.GetAccessFlags() << std::dec |
| << "\n"; |
| } |
| } |
| |
| for (const auto& entry : |
| { std::make_pair(kDirectMethodResolution, dep.second->direct_methods_), |
| std::make_pair(kVirtualMethodResolution, dep.second->virtual_methods_), |
| std::make_pair(kInterfaceMethodResolution, dep.second->interface_methods_) }) { |
| for (const MethodResolution& method : entry.second) { |
| const DexFile::MethodId& method_id = dex_file.GetMethodId(method.GetDexMethodIndex()); |
| vios->Stream() |
| << dex_file.GetMethodDeclaringClassDescriptor(method_id) << "->" |
| << dex_file.GetMethodName(method_id) |
| << dex_file.GetMethodSignature(method_id).ToString() |
| << " is expected to be "; |
| if (!method.IsResolved()) { |
| vios->Stream() << "unresolved\n"; |
| } else { |
| vios->Stream() |
| << "in class " |
| << GetStringFromId(dex_file, method.GetDeclaringClassIndex()) |
| << ", have the access flags " << std::hex << method.GetAccessFlags() << std::dec |
| << ", and be of kind " << entry.first |
| << "\n"; |
| } |
| } |
| } |
| |
| for (dex::TypeIndex type_index : dep.second->unverified_classes_) { |
| vios->Stream() |
| << dex_file.StringByTypeIdx(type_index) |
| << " is expected to be verified at runtime\n"; |
| } |
| } |
| } |
| |
| bool VerifierDeps::ValidateDependencies(Handle<mirror::ClassLoader> class_loader, |
| Thread* self) const { |
| for (const auto& entry : dex_deps_) { |
| if (!VerifyDexFile(class_loader, *entry.first, *entry.second, self)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // TODO: share that helper with other parts of the compiler that have |
| // the same lookup pattern. |
| static mirror::Class* FindClassAndClearException(ClassLinker* class_linker, |
| Thread* self, |
| const char* name, |
| Handle<mirror::ClassLoader> class_loader) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| mirror::Class* result = class_linker->FindClass(self, name, class_loader); |
| if (result == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| self->ClearException(); |
| } |
| return result; |
| } |
| |
| bool VerifierDeps::VerifyAssignability(Handle<mirror::ClassLoader> class_loader, |
| const DexFile& dex_file, |
| const std::set<TypeAssignability>& assignables, |
| bool expected_assignability, |
| Thread* self) const { |
| StackHandleScope<2> hs(self); |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| MutableHandle<mirror::Class> source(hs.NewHandle<mirror::Class>(nullptr)); |
| MutableHandle<mirror::Class> destination(hs.NewHandle<mirror::Class>(nullptr)); |
| |
| for (const auto& entry : assignables) { |
| const std::string& destination_desc = GetStringFromId(dex_file, entry.GetDestination()); |
| destination.Assign( |
| FindClassAndClearException(class_linker, self, destination_desc.c_str(), class_loader)); |
| const std::string& source_desc = GetStringFromId(dex_file, entry.GetSource()); |
| source.Assign( |
| FindClassAndClearException(class_linker, self, source_desc.c_str(), class_loader)); |
| |
| if (destination == nullptr) { |
| LOG(INFO) << "VerifiersDeps: Could not resolve class " << destination_desc; |
| return false; |
| } |
| |
| if (source == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve class " << source_desc; |
| return false; |
| } |
| |
| DCHECK(destination->IsResolved() && source->IsResolved()); |
| if (destination->IsAssignableFrom(source.Get()) != expected_assignability) { |
| LOG(INFO) << "VerifierDeps: Class " |
| << destination_desc |
| << (expected_assignability ? " not " : " ") |
| << "assignable from " |
| << source_desc; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool VerifierDeps::VerifyClasses(Handle<mirror::ClassLoader> class_loader, |
| const DexFile& dex_file, |
| const std::set<ClassResolution>& classes, |
| Thread* self) const { |
| StackHandleScope<1> hs(self); |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| MutableHandle<mirror::Class> cls(hs.NewHandle<mirror::Class>(nullptr)); |
| for (const auto& entry : classes) { |
| const char* descriptor = dex_file.StringByTypeIdx(entry.GetDexTypeIndex()); |
| cls.Assign(FindClassAndClearException(class_linker, self, descriptor, class_loader)); |
| |
| if (entry.IsResolved()) { |
| if (cls == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve class " << descriptor; |
| return false; |
| } else if (entry.GetAccessFlags() != GetAccessFlags(cls.Get())) { |
| LOG(INFO) << "VerifierDeps: Unexpected access flags on class " |
| << descriptor |
| << std::hex |
| << " (expected=" |
| << entry.GetAccessFlags() |
| << ", actual=" |
| << GetAccessFlags(cls.Get()) << ")" |
| << std::dec; |
| return false; |
| } |
| } else if (cls != nullptr) { |
| LOG(INFO) << "VerifierDeps: Unexpected successful resolution of class " << descriptor; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static std::string GetFieldDescription(const DexFile& dex_file, uint32_t index) { |
| const DexFile::FieldId& field_id = dex_file.GetFieldId(index); |
| return std::string(dex_file.GetFieldDeclaringClassDescriptor(field_id)) |
| + "->" |
| + dex_file.GetFieldName(field_id) |
| + ":" |
| + dex_file.GetFieldTypeDescriptor(field_id); |
| } |
| |
| bool VerifierDeps::VerifyFields(Handle<mirror::ClassLoader> class_loader, |
| const DexFile& dex_file, |
| const std::set<FieldResolution>& fields, |
| Thread* self) const { |
| // Check recorded fields are resolved the same way, have the same recorded class, |
| // and have the same recorded flags. |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| for (const auto& entry : fields) { |
| const DexFile::FieldId& field_id = dex_file.GetFieldId(entry.GetDexFieldIndex()); |
| StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); |
| StringPiece type(dex_file.StringDataByIdx(dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); |
| // Only use field_id.class_idx_ when the entry is unresolved, which is rare. |
| // Otherwise, we might end up resolving an application class, which is expensive. |
| std::string expected_decl_klass = entry.IsResolved() |
| ? GetStringFromId(dex_file, entry.GetDeclaringClassIndex()) |
| : dex_file.StringByTypeIdx(field_id.class_idx_); |
| mirror::Class* cls = FindClassAndClearException( |
| class_linker, self, expected_decl_klass.c_str(), class_loader); |
| if (cls == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve class " << expected_decl_klass; |
| return false; |
| } |
| DCHECK(cls->IsResolved()); |
| |
| ArtField* field = mirror::Class::FindField(self, cls, name, type); |
| if (entry.IsResolved()) { |
| std::string temp; |
| if (field == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve field " |
| << GetFieldDescription(dex_file, entry.GetDexFieldIndex()); |
| return false; |
| } else if (expected_decl_klass != field->GetDeclaringClass()->GetDescriptor(&temp)) { |
| LOG(INFO) << "VerifierDeps: Unexpected declaring class for field resolution " |
| << GetFieldDescription(dex_file, entry.GetDexFieldIndex()) |
| << " (expected=" << expected_decl_klass |
| << ", actual=" << field->GetDeclaringClass()->GetDescriptor(&temp) << ")"; |
| return false; |
| } else if (entry.GetAccessFlags() != GetAccessFlags(field)) { |
| LOG(INFO) << "VerifierDeps: Unexpected access flags for resolved field " |
| << GetFieldDescription(dex_file, entry.GetDexFieldIndex()) |
| << std::hex << " (expected=" << entry.GetAccessFlags() |
| << ", actual=" << GetAccessFlags(field) << ")" << std::dec; |
| return false; |
| } |
| } else if (field != nullptr) { |
| LOG(INFO) << "VerifierDeps: Unexpected successful resolution of field " |
| << GetFieldDescription(dex_file, entry.GetDexFieldIndex()); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static std::string GetMethodDescription(const DexFile& dex_file, uint32_t index) { |
| const DexFile::MethodId& method_id = dex_file.GetMethodId(index); |
| return std::string(dex_file.GetMethodDeclaringClassDescriptor(method_id)) |
| + "->" |
| + dex_file.GetMethodName(method_id) |
| + dex_file.GetMethodSignature(method_id).ToString(); |
| } |
| |
| bool VerifierDeps::VerifyMethods(Handle<mirror::ClassLoader> class_loader, |
| const DexFile& dex_file, |
| const std::set<MethodResolution>& methods, |
| MethodResolutionKind kind, |
| Thread* self) const { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| PointerSize pointer_size = class_linker->GetImagePointerSize(); |
| |
| for (const auto& entry : methods) { |
| const DexFile::MethodId& method_id = dex_file.GetMethodId(entry.GetDexMethodIndex()); |
| |
| const char* name = dex_file.GetMethodName(method_id); |
| const Signature signature = dex_file.GetMethodSignature(method_id); |
| // Only use method_id.class_idx_ when the entry is unresolved, which is rare. |
| // Otherwise, we might end up resolving an application class, which is expensive. |
| std::string expected_decl_klass = entry.IsResolved() |
| ? GetStringFromId(dex_file, entry.GetDeclaringClassIndex()) |
| : dex_file.StringByTypeIdx(method_id.class_idx_); |
| |
| mirror::Class* cls = FindClassAndClearException( |
| class_linker, self, expected_decl_klass.c_str(), class_loader); |
| if (cls == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve class " << expected_decl_klass; |
| return false; |
| } |
| DCHECK(cls->IsResolved()); |
| ArtMethod* method = nullptr; |
| if (kind == kDirectMethodResolution) { |
| method = cls->FindDirectMethod(name, signature, pointer_size); |
| } else if (kind == kVirtualMethodResolution) { |
| method = cls->FindVirtualMethod(name, signature, pointer_size); |
| } else { |
| DCHECK_EQ(kind, kInterfaceMethodResolution); |
| method = cls->FindInterfaceMethod(name, signature, pointer_size); |
| } |
| |
| if (entry.IsResolved()) { |
| std::string temp; |
| if (method == nullptr) { |
| LOG(INFO) << "VerifierDeps: Could not resolve " |
| << kind |
| << " method " |
| << GetMethodDescription(dex_file, entry.GetDexMethodIndex()); |
| return false; |
| } else if (expected_decl_klass != method->GetDeclaringClass()->GetDescriptor(&temp)) { |
| LOG(INFO) << "VerifierDeps: Unexpected declaring class for " |
| << kind |
| << " method resolution " |
| << GetMethodDescription(dex_file, entry.GetDexMethodIndex()) |
| << " (expected=" |
| << expected_decl_klass |
| << ", actual=" |
| << method->GetDeclaringClass()->GetDescriptor(&temp) |
| << ")"; |
| return false; |
| } else if (entry.GetAccessFlags() != GetAccessFlags(method)) { |
| LOG(INFO) << "VerifierDeps: Unexpected access flags for resolved " |
| << kind |
| << " method resolution " |
| << GetMethodDescription(dex_file, entry.GetDexMethodIndex()) |
| << std::hex |
| << " (expected=" |
| << entry.GetAccessFlags() |
| << ", actual=" |
| << GetAccessFlags(method) << ")" |
| << std::dec; |
| return false; |
| } |
| } else if (method != nullptr) { |
| LOG(INFO) << "VerifierDeps: Unexpected successful resolution of " |
| << kind |
| << " method " |
| << GetMethodDescription(dex_file, entry.GetDexMethodIndex()); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool VerifierDeps::VerifyDexFile(Handle<mirror::ClassLoader> class_loader, |
| const DexFile& dex_file, |
| const DexFileDeps& deps, |
| Thread* self) const { |
| bool result = VerifyAssignability( |
| class_loader, dex_file, deps.assignable_types_, /* expected_assignability */ true, self); |
| result = result && VerifyAssignability( |
| class_loader, dex_file, deps.unassignable_types_, /* expected_assignability */ false, self); |
| |
| result = result && VerifyClasses(class_loader, dex_file, deps.classes_, self); |
| result = result && VerifyFields(class_loader, dex_file, deps.fields_, self); |
| |
| result = result && VerifyMethods( |
| class_loader, dex_file, deps.direct_methods_, kDirectMethodResolution, self); |
| result = result && VerifyMethods( |
| class_loader, dex_file, deps.virtual_methods_, kVirtualMethodResolution, self); |
| result = result && VerifyMethods( |
| class_loader, dex_file, deps.interface_methods_, kInterfaceMethodResolution, self); |
| |
| return result; |
| } |
| |
| } // namespace verifier |
| } // namespace art |
