// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file // for details. All rights reserved. Use of this source code is governed by a // BSD-style license that can be found in the LICENSE file. #include "vm/class_finalizer.h" #include "vm/flags.h" #include "vm/heap.h" #include "vm/isolate.h" #include "vm/longjump.h" #include "vm/object_store.h" #include "vm/parser.h" #include "vm/symbols.h" namespace dart { DEFINE_FLAG(bool, error_on_bad_override, false, "Report error for bad overrides."); DEFINE_FLAG(bool, error_on_bad_type, false, "Report error for malformed types."); DEFINE_FLAG(bool, print_classes, false, "Prints details about loaded classes."); DEFINE_FLAG(bool, trace_class_finalization, false, "Trace class finalization."); DEFINE_FLAG(bool, trace_type_finalization, false, "Trace type finalization."); DECLARE_FLAG(bool, enable_type_checks); DECLARE_FLAG(bool, use_cha); bool ClassFinalizer::AllClassesFinalized() { ObjectStore* object_store = Isolate::Current()->object_store(); const GrowableObjectArray& classes = GrowableObjectArray::Handle(object_store->pending_classes()); return classes.Length() == 0; } // Removes optimized code once we load more classes, since --use_cha based // optimizations may have become invalid. // Only methods which owner classes where subclasses can be invalid. // TODO(srdjan): Be even more precise by recording the exact CHA optimization. static void RemoveOptimizedCode( const GrowableArray& added_subclasses_to_cids) { ASSERT(FLAG_use_cha); if (added_subclasses_to_cids.is_empty()) return; // Deoptimize all live frames. DeoptimizeIfOwner(added_subclasses_to_cids); // Switch all functions' code to unoptimized. const ClassTable& class_table = *Isolate::Current()->class_table(); Class& cls = Class::Handle(); Array& array = Array::Handle(); Function& function = Function::Handle(); for (intptr_t i = 0; i < added_subclasses_to_cids.length(); i++) { intptr_t cid = added_subclasses_to_cids[i]; cls = class_table.At(cid); ASSERT(!cls.IsNull()); array = cls.functions(); const intptr_t num_functions = array.IsNull() ? 0 : array.Length(); for (intptr_t f = 0; f < num_functions; f++) { function ^= array.At(f); ASSERT(!function.IsNull()); if (function.HasOptimizedCode()) { function.SwitchToUnoptimizedCode(); } } } } void AddSuperType(const AbstractType& type, GrowableArray* finalized_super_classes) { ASSERT(type.HasResolvedTypeClass()); ASSERT(!type.IsDynamicType()); if (type.IsObjectType()) { return; } const Class& cls = Class::Handle(type.type_class()); ASSERT(cls.is_finalized()); const intptr_t cid = cls.id(); for (intptr_t i = 0; i < finalized_super_classes->length(); i++) { if ((*finalized_super_classes)[i] == cid) { // Already added. return; } } finalized_super_classes->Add(cid); const AbstractType& super_type = AbstractType::Handle(cls.super_type()); AddSuperType(super_type, finalized_super_classes); } // Use array instead of set since we expect very few subclassed classes // to occur. static void CollectFinalizedSuperClasses( const GrowableObjectArray& pending_classes, GrowableArray* finalized_super_classes) { Class& cls = Class::Handle(); AbstractType& super_type = Type::Handle(); for (intptr_t i = 0; i < pending_classes.Length(); i++) { cls ^= pending_classes.At(i); ASSERT(!cls.is_finalized()); super_type = cls.super_type(); if (!super_type.IsNull()) { if (!super_type.IsMalformed() && super_type.HasResolvedTypeClass()) { cls ^= super_type.type_class(); if (cls.is_finalized()) { AddSuperType(super_type, finalized_super_classes); } } } } } // Class finalization occurs: // a) when bootstrap process completes (VerifyBootstrapClasses). // b) after the user classes are loaded (dart_api). bool ClassFinalizer::FinalizePendingClasses() { bool retval = true; Isolate* isolate = Isolate::Current(); ASSERT(isolate != NULL); HANDLESCOPE(isolate); ObjectStore* object_store = isolate->object_store(); const Error& error = Error::Handle(isolate, object_store->sticky_error()); if (!error.IsNull()) { return false; } if (AllClassesFinalized()) { return true; } GrowableArray added_subclasses_to_cids; LongJump* base = isolate->long_jump_base(); LongJump jump; isolate->set_long_jump_base(&jump); if (setjmp(*jump.Set()) == 0) { GrowableObjectArray& class_array = GrowableObjectArray::Handle(); class_array = object_store->pending_classes(); ASSERT(!class_array.IsNull()); // Collect superclasses that were already finalized before this run of // finalization. CollectFinalizedSuperClasses(class_array, &added_subclasses_to_cids); Class& cls = Class::Handle(); // First resolve all superclasses. for (intptr_t i = 0; i < class_array.Length(); i++) { cls ^= class_array.At(i); GrowableArray visited_interfaces; ResolveSuperTypeAndInterfaces(cls, &visited_interfaces); } // Finalize all classes. for (intptr_t i = 0; i < class_array.Length(); i++) { cls ^= class_array.At(i); FinalizeTypesInClass(cls); } if (FLAG_print_classes) { for (intptr_t i = 0; i < class_array.Length(); i++) { cls ^= class_array.At(i); PrintClassInformation(cls); } } // Clear pending classes array. class_array = GrowableObjectArray::New(); object_store->set_pending_classes(class_array); VerifyImplicitFieldOffsets(); // Verification after an error may fail. } else { retval = false; } isolate->set_long_jump_base(base); if (FLAG_use_cha) { RemoveOptimizedCode(added_subclasses_to_cids); } return retval; } // Adds all interfaces of cls into 'collected'. Duplicate entries may occur. // No cycles are allowed. void ClassFinalizer::CollectInterfaces(const Class& cls, const GrowableObjectArray& collected) { const Array& interface_array = Array::Handle(cls.interfaces()); AbstractType& interface = AbstractType::Handle(); Class& interface_class = Class::Handle(); for (intptr_t i = 0; i < interface_array.Length(); i++) { interface ^= interface_array.At(i); interface_class = interface.type_class(); collected.Add(interface_class); CollectInterfaces(interface_class, collected); } } void ClassFinalizer::VerifyBootstrapClasses() { if (FLAG_trace_class_finalization) { OS::Print("VerifyBootstrapClasses START.\n"); } ObjectStore* object_store = Isolate::Current()->object_store(); Class& cls = Class::Handle(); #if defined(DEBUG) // Basic checking. cls = object_store->object_class(); ASSERT(Instance::InstanceSize() == cls.instance_size()); cls = object_store->integer_implementation_class(); ASSERT(Integer::InstanceSize() == cls.instance_size()); cls = object_store->smi_class(); ASSERT(Smi::InstanceSize() == cls.instance_size()); cls = object_store->mint_class(); ASSERT(Mint::InstanceSize() == cls.instance_size()); cls = object_store->bigint_class(); ASSERT(Bigint::InstanceSize() == cls.instance_size()); cls = object_store->one_byte_string_class(); ASSERT(OneByteString::InstanceSize() == cls.instance_size()); cls = object_store->two_byte_string_class(); ASSERT(TwoByteString::InstanceSize() == cls.instance_size()); cls = object_store->external_one_byte_string_class(); ASSERT(ExternalOneByteString::InstanceSize() == cls.instance_size()); cls = object_store->external_two_byte_string_class(); ASSERT(ExternalTwoByteString::InstanceSize() == cls.instance_size()); cls = object_store->double_class(); ASSERT(Double::InstanceSize() == cls.instance_size()); cls = object_store->bool_class(); ASSERT(Bool::InstanceSize() == cls.instance_size()); cls = object_store->array_class(); ASSERT(Array::InstanceSize() == cls.instance_size()); cls = object_store->immutable_array_class(); ASSERT(ImmutableArray::InstanceSize() == cls.instance_size()); cls = object_store->weak_property_class(); ASSERT(WeakProperty::InstanceSize() == cls.instance_size()); #endif // defined(DEBUG) // Remember the currently pending classes. const GrowableObjectArray& class_array = GrowableObjectArray::Handle(object_store->pending_classes()); for (intptr_t i = 0; i < class_array.Length(); i++) { // TODO(iposva): Add real checks. cls ^= class_array.At(i); if (cls.is_finalized() || cls.is_prefinalized()) { // Pre-finalized bootstrap classes must not define any fields. ASSERT(!cls.HasInstanceFields()); } } // Finalize classes that aren't pre-finalized by Object::Init(). if (!FinalizePendingClasses()) { // TODO(srdjan): Exit like a real VM instead. const Error& err = Error::Handle(object_store->sticky_error()); OS::PrintErr("Could not verify bootstrap classes : %s\n", err.ToErrorCString()); OS::Exit(255); } if (FLAG_trace_class_finalization) { OS::Print("VerifyBootstrapClasses END.\n"); } Isolate::Current()->heap()->Verify(); } // Resolve unresolved_class in the library of cls, or return null. RawClass* ClassFinalizer::ResolveClass( const Class& cls, const UnresolvedClass& unresolved_class) { const String& class_name = String::Handle(unresolved_class.ident()); Library& lib = Library::Handle(); Class& resolved_class = Class::Handle(); if (unresolved_class.library_prefix() == LibraryPrefix::null()) { lib = cls.library(); ASSERT(!lib.IsNull()); resolved_class = lib.LookupClass(class_name); } else { LibraryPrefix& lib_prefix = LibraryPrefix::Handle(); lib_prefix = unresolved_class.library_prefix(); ASSERT(!lib_prefix.IsNull()); resolved_class = lib_prefix.LookupClass(class_name); } return resolved_class.raw(); } void ClassFinalizer::ResolveRedirectingFactory(const Class& cls, const Function& factory) { const Function& target = Function::Handle(factory.RedirectionTarget()); if (target.IsNull()) { const Type& type = Type::Handle(factory.RedirectionType()); if (!type.IsMalformed()) { const GrowableObjectArray& visited_factories = GrowableObjectArray::Handle(GrowableObjectArray::New()); ResolveRedirectingFactoryTarget(cls, factory, visited_factories); } } } void ClassFinalizer::ResolveRedirectingFactoryTarget( const Class& cls, const Function& factory, const GrowableObjectArray& visited_factories) { ASSERT(factory.IsRedirectingFactory()); // Check for redirection cycle. for (int i = 0; i < visited_factories.Length(); i++) { if (visited_factories.At(i) == factory.raw()) { // A redirection cycle is reported as a compile-time error. const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, factory.token_pos(), "factory '%s' illegally redirects to itself", String::Handle(factory.name()).ToCString()); } } visited_factories.Add(factory); // Check if target is already resolved. Type& type = Type::Handle(factory.RedirectionType()); Function& target = Function::Handle(factory.RedirectionTarget()); if (type.IsMalformed()) { // Already resolved to a malformed type. Will throw on usage. ASSERT(target.IsNull()); return; } if (!target.IsNull()) { // Already resolved. return; } // Target is not resolved yet. if (FLAG_trace_class_finalization) { OS::Print("Resolving redirecting factory: %s\n", String::Handle(factory.name()).ToCString()); } ResolveType(cls, type, kCanonicalize); type ^= FinalizeType(cls, type, kCanonicalize); factory.SetRedirectionType(type); if (type.IsMalformed()) { ASSERT(factory.RedirectionTarget() == Function::null()); return; } ASSERT(!type.IsTypeParameter()); // Resolved in parser. if (type.IsDynamicType()) { // Replace the type with a malformed type and compile a throw when called. type = NewFinalizedMalformedType( Error::Handle(), // No previous error. cls, factory.token_pos(), "factory may not redirect to 'dynamic'"); factory.SetRedirectionType(type); ASSERT(factory.RedirectionTarget() == Function::null()); return; } const Class& target_class = Class::Handle(type.type_class()); String& target_class_name = String::Handle(target_class.Name()); String& target_name = String::Handle( String::Concat(target_class_name, Symbols::Dot())); const String& identifier = String::Handle(factory.RedirectionIdentifier()); if (!identifier.IsNull()) { target_name = String::Concat(target_name, identifier); } // Verify that the target constructor of the redirection exists. target = target_class.LookupConstructor(target_name); if (target.IsNull()) { target = target_class.LookupFactory(target_name); } if (target.IsNull()) { const String& user_visible_target_name = identifier.IsNull() ? target_class_name : target_name; // Replace the type with a malformed type and compile a throw when called. type = NewFinalizedMalformedType( Error::Handle(), // No previous error. cls, factory.token_pos(), "class '%s' has no constructor or factory named '%s'", target_class_name.ToCString(), user_visible_target_name.ToCString()); factory.SetRedirectionType(type); ASSERT(factory.RedirectionTarget() == Function::null()); return; } if (FLAG_error_on_bad_override) { // Verify that the target is compatible with the redirecting factory. Error& error = Error::Handle(); if (!target.HasCompatibleParametersWith(factory, &error)) { type = NewFinalizedMalformedType( error, target_class, target.token_pos(), "constructor '%s' has incompatible parameters with " "redirecting factory '%s'", String::Handle(target.name()).ToCString(), String::Handle(factory.name()).ToCString()); factory.SetRedirectionType(type); ASSERT(factory.RedirectionTarget() == Function::null()); return; } } // Verify that the target is const if the redirecting factory is const. if (factory.is_const() && !target.is_const()) { const Script& script = Script::Handle(target_class.script()); ReportError(Error::Handle(), // No previous error. script, target.token_pos(), "constructor '%s' must be const as required by redirecting" "const factory '%s'", String::Handle(target.name()).ToCString(), String::Handle(factory.name()).ToCString()); } // Update redirection data with resolved target. factory.SetRedirectionTarget(target); // Not needed anymore. factory.SetRedirectionIdentifier(Object::null_string()); if (!target.IsRedirectingFactory()) { return; } // The target is itself a redirecting factory. Recursively resolve its own // target and update the current redirection data to point to the end target // of the redirection chain. ResolveRedirectingFactoryTarget(target_class, target, visited_factories); Type& target_type = Type::Handle(target.RedirectionType()); Function& target_target = Function::Handle(target.RedirectionTarget()); if (target_target.IsNull()) { ASSERT(target_type.IsMalformed()); } else { // If the target type refers to type parameters, substitute them with the // type arguments of the redirection type. if (!target_type.IsInstantiated()) { const AbstractTypeArguments& type_args = AbstractTypeArguments::Handle( type.arguments()); Error& malformed_error = Error::Handle(); target_type ^= target_type.InstantiateFrom(type_args, &malformed_error); if (malformed_error.IsNull()) { target_type ^= FinalizeType(cls, target_type, kCanonicalize); } else { FinalizeMalformedType(malformed_error, cls, target_type, "cannot resolve redirecting factory"); target_target = Function::null(); } } } factory.SetRedirectionType(target_type); factory.SetRedirectionTarget(target_target); } void ClassFinalizer::ResolveType(const Class& cls, const AbstractType& type, FinalizationKind finalization) { if (type.IsResolved() || type.IsFinalized()) { return; } if (FLAG_trace_type_finalization) { OS::Print("Resolve type '%s'\n", String::Handle(type.Name()).ToCString()); } // Resolve the type class. if (!type.HasResolvedTypeClass()) { // Type parameters are always resolved in the parser in the correct // non-static scope or factory scope. That resolution scope is unknown here. // Being able to resolve a type parameter from class cls here would indicate // that the type parameter appeared in a static scope. Leaving the type as // unresolved is the correct thing to do. // Lookup the type class. const UnresolvedClass& unresolved_class = UnresolvedClass::Handle(type.unresolved_class()); const Class& type_class = Class::Handle(ResolveClass(cls, unresolved_class)); // Replace unresolved class with resolved type class. const Type& parameterized_type = Type::Cast(type); if (type_class.IsNull()) { if ((finalization == kCanonicalizeWellFormed) || FLAG_error_on_bad_type) { // The type class could not be resolved. The type is malformed. FinalizeMalformedType( Error::Handle(), // No previous error. cls, parameterized_type, "cannot resolve class '%s' from '%s'", String::Handle(unresolved_class.Name()).ToCString(), String::Handle(cls.Name()).ToCString()); } else { // Map the malformed type to dynamic and ignore type arguments. parameterized_type.set_type_class(Class::Handle( Object::dynamic_class())); parameterized_type.set_arguments( Object::null_abstract_type_arguments()); } return; } parameterized_type.set_type_class(type_class); } // Resolve type arguments, if any. const AbstractTypeArguments& arguments = AbstractTypeArguments::Handle(type.arguments()); if (!arguments.IsNull()) { const intptr_t num_arguments = arguments.Length(); AbstractType& type_argument = AbstractType::Handle(); for (intptr_t i = 0; i < num_arguments; i++) { type_argument = arguments.TypeAt(i); ResolveType(cls, type_argument, finalization); } } } void ClassFinalizer::FinalizeTypeParameters(const Class& cls) { if (cls.IsMixinApplication()) { // Copy the type parameters to the mixin application. ApplyMixinType(cls); } // The type parameter bounds are not finalized here. const TypeArguments& type_parameters = TypeArguments::Handle(cls.type_parameters()); if (!type_parameters.IsNull()) { TypeParameter& type_parameter = TypeParameter::Handle(); const intptr_t num_types = type_parameters.Length(); for (intptr_t i = 0; i < num_types; i++) { type_parameter ^= type_parameters.TypeAt(i); type_parameter ^= FinalizeType(cls, type_parameter, kCanonicalizeWellFormed); type_parameters.SetTypeAt(i, type_parameter); } } } // Finalize the type argument vector 'arguments' of the type defined by the // class 'cls' parameterized with the type arguments 'cls_args'. // The vector 'cls_args' is already initialized as a subvector at the correct // position in the passed in 'arguments' vector. // The subvector 'cls_args' has length cls.NumTypeParameters() and starts at // offset cls.NumTypeArguments() - cls.NumTypeParameters() of the 'arguments' // vector. // Example: // Declared: class C extends B { ... } // class B extends A { ... } // Input: C expressed as // cls = C, arguments = [null, null, String, double], // i.e. cls_args = [String, double], offset = 2, length = 2. // Output: arguments = [int, double, String, double] void ClassFinalizer::FinalizeTypeArguments( const Class& cls, const AbstractTypeArguments& arguments, FinalizationKind finalization, Error* bound_error) { ASSERT(arguments.Length() >= cls.NumTypeArguments()); if (!cls.is_type_finalized()) { FinalizeTypeParameters(cls); ResolveUpperBounds(cls); } AbstractType& super_type = AbstractType::Handle(cls.super_type()); if (!super_type.IsNull()) { const Class& super_class = Class::Handle(super_type.type_class()); AbstractTypeArguments& super_type_args = AbstractTypeArguments::Handle(); if (super_type.IsBeingFinalized()) { // This type references itself via its type arguments. This is legal, but // we must avoid endless recursion. We therefore map the innermost // super type to dynamic. // Note that a direct self-reference via the super class chain is illegal // and reported as an error earlier. // Such legal self-references occur with F-bounded quantification. // Example 1: class Derived extends Base. // The type 'Derived' forms a cycle by pointing to itself via its // flattened type argument vector: Derived[Base[Derived[Base[...]]]] // We break the cycle as follows: Derived[Base[Derived[dynamic]]] // Example 2: class Derived extends Base> results in // Derived[Base[Middle[Derived[dynamic]]]] // Example 3: class Derived extends Base> results in // Derived[Base[Derived[dynamic]], T]. ASSERT(super_type_args.IsNull()); // Same as a vector of dynamic. } else { super_type ^= FinalizeType(cls, super_type, finalization); cls.set_super_type(super_type); super_type_args = super_type.arguments(); } const intptr_t num_super_type_params = super_class.NumTypeParameters(); const intptr_t offset = super_class.NumTypeArguments(); const intptr_t super_offset = offset - num_super_type_params; ASSERT(offset == (cls.NumTypeArguments() - cls.NumTypeParameters())); AbstractType& super_type_arg = AbstractType::Handle(Type::DynamicType()); for (intptr_t i = 0; i < num_super_type_params; i++) { if (!super_type_args.IsNull()) { super_type_arg = super_type_args.TypeAt(super_offset + i); if (!super_type_arg.IsInstantiated()) { Error& malformed_error = Error::Handle(); super_type_arg = super_type_arg.InstantiateFrom(arguments, &malformed_error); if (!malformed_error.IsNull()) { if (!super_type_arg.IsInstantiated()) { // CheckTypeArgumentBounds will insert a BoundedType. } else if (bound_error->IsNull()) { *bound_error = malformed_error.raw(); } } } if (finalization >= kCanonicalize) { super_type_arg = super_type_arg.Canonicalize(); } } arguments.SetTypeAt(super_offset + i, super_type_arg); } FinalizeTypeArguments(super_class, arguments, finalization, bound_error); } } // Check the type argument vector 'arguments' against the corresponding bounds // of the type parameters of class 'cls' and, recursively, of its superclasses. // Replace a type argument that cannot be checked at compile time by a // BoundedType, thereby postponing the bound check to run time. // Return a bound error if a type argument is not within bound at compile time. void ClassFinalizer::CheckTypeArgumentBounds( const Class& cls, const AbstractTypeArguments& arguments, Error* bound_error) { if (!cls.is_type_finalized()) { FinalizeUpperBounds(cls); } // Note that when finalizing a type, we need to verify the bounds in both // production mode and checked mode, because the finalized type may be written // to a snapshot. It would be wrong to ignore bounds when generating the // snapshot in production mode and then use the unchecked type in checked mode // after reading it from the snapshot. // However, we do not immediately report a bound error, which would be wrong // in production mode, but simply postpone the bound checking to runtime. const intptr_t num_type_params = cls.NumTypeParameters(); const intptr_t offset = cls.NumTypeArguments() - num_type_params; AbstractType& type_arg = AbstractType::Handle(); AbstractType& cls_type_param = AbstractType::Handle(); AbstractType& declared_bound = AbstractType::Handle(); AbstractType& instantiated_bound = AbstractType::Handle(); const TypeArguments& cls_type_params = TypeArguments::Handle(cls.type_parameters()); ASSERT((cls_type_params.IsNull() && (num_type_params == 0)) || (cls_type_params.Length() == num_type_params)); for (intptr_t i = 0; i < num_type_params; i++) { type_arg = arguments.TypeAt(offset + i); if (type_arg.IsDynamicType()) { continue; } cls_type_param = cls_type_params.TypeAt(i); const TypeParameter& type_param = TypeParameter::Cast(cls_type_param); ASSERT(type_param.IsFinalized()); declared_bound = type_param.bound(); if (!declared_bound.IsObjectType() && !declared_bound.IsDynamicType()) { if (!declared_bound.IsFinalized() && !declared_bound.IsBeingFinalized()) { declared_bound = FinalizeType(cls, declared_bound, kCanonicalize); type_param.set_bound(declared_bound); } ASSERT(declared_bound.IsFinalized() || declared_bound.IsBeingFinalized()); Error& malformed_error = Error::Handle(); // Note that the bound may be malformed, in which case the bound check // will return an error and the bound check will be postponed to run time. if (declared_bound.IsInstantiated()) { instantiated_bound = declared_bound.raw(); } else { instantiated_bound = declared_bound.InstantiateFrom(arguments, &malformed_error); } if (!instantiated_bound.IsFinalized()) { // The bound refers to type parameters, creating a cycle; postpone // bound check to run time, when the bound will be finalized. // The bound may not necessarily be 'IsBeingFinalized' yet, as is the // case with a pair of type parameters of the same class referring to // each other via their bounds. type_arg = BoundedType::New(type_arg, instantiated_bound, type_param); arguments.SetTypeAt(offset + i, type_arg); continue; } // TODO(regis): We could simplify this code if we could differentiate // between a failed bound check and a bound check that is undecidable at // compile time. // Shortcut the special case where we check a type parameter against its // declared upper bound. bool below_bound = true; if (malformed_error.IsNull() && (!type_arg.Equals(type_param) || !instantiated_bound.Equals(declared_bound))) { // Pass NULL to prevent expensive and unnecessary error formatting in // the case the bound check is postponed to run time. below_bound = type_param.CheckBound(type_arg, instantiated_bound, NULL); } if (!malformed_error.IsNull() || !below_bound) { if (!type_arg.IsInstantiated() || !instantiated_bound.IsInstantiated()) { type_arg = BoundedType::New(type_arg, instantiated_bound, type_param); arguments.SetTypeAt(offset + i, type_arg); } else if (bound_error->IsNull()) { if (malformed_error.IsNull()) { // Call CheckBound again to format error message. type_param.CheckBound(type_arg, instantiated_bound, &malformed_error); } ASSERT(!malformed_error.IsNull()); *bound_error = malformed_error.raw(); } } } } AbstractType& super_type = AbstractType::Handle(cls.super_type()); if (!super_type.IsNull()) { const Class& super_class = Class::Handle(super_type.type_class()); CheckTypeArgumentBounds(super_class, arguments, bound_error); } } RawAbstractType* ClassFinalizer::FinalizeType(const Class& cls, const AbstractType& type, FinalizationKind finalization) { if (type.IsFinalized()) { // Ensure type is canonical if canonicalization is requested, unless type is // malformed. if ((finalization >= kCanonicalize) && !type.IsMalformed()) { return type.Canonicalize(); } return type.raw(); } ASSERT(type.IsResolved()); ASSERT(finalization >= kFinalize); if (FLAG_trace_type_finalization) { OS::Print("Finalize type '%s' for class '%s'\n", String::Handle(type.Name()).ToCString(), cls.ToCString()); } if (type.IsTypeParameter()) { const TypeParameter& type_parameter = TypeParameter::Cast(type); const Class& parameterized_class = Class::Handle(type_parameter.parameterized_class()); ASSERT(!parameterized_class.IsNull()); // The index must reflect the position of this type parameter in the type // arguments vector of its parameterized class. The offset to add is the // number of type arguments in the super type, which is equal to the // difference in number of type arguments and type parameters of the // parameterized class. const intptr_t offset = parameterized_class.NumTypeArguments() - parameterized_class.NumTypeParameters(); type_parameter.set_index(type_parameter.index() + offset); type_parameter.set_is_finalized(); // We do not canonicalize type parameters. return type_parameter.raw(); } // At this point, we can only have a parameterized_type. const Type& parameterized_type = Type::Cast(type); // Types illegally referring to themselves should have been detected earlier. ASSERT(!parameterized_type.IsBeingFinalized()); // Mark type as being finalized in order to detect illegal self reference. parameterized_type.set_is_being_finalized(); // The type class does not need to be finalized in order to finalize the type, // however, it must at least be resolved (this was done as part of resolving // the type itself, a precondition to calling FinalizeType). // Also, the interfaces of the type class must be resolved and the type // parameters of the type class must be finalized. Class& type_class = Class::Handle(parameterized_type.type_class()); if (!type_class.is_type_finalized()) { FinalizeTypeParameters(type_class); ResolveUpperBounds(type_class); } // Finalize the current type arguments of the type, which are still the // parsed type arguments. AbstractTypeArguments& arguments = AbstractTypeArguments::Handle(parameterized_type.arguments()); if (!arguments.IsNull()) { const intptr_t num_arguments = arguments.Length(); AbstractType& type_argument = AbstractType::Handle(); for (intptr_t i = 0; i < num_arguments; i++) { type_argument = arguments.TypeAt(i); type_argument = FinalizeType(cls, type_argument, finalization); if (type_argument.IsMalformed()) { // Malformed type arguments are mapped to dynamic. type_argument = Type::DynamicType(); } arguments.SetTypeAt(i, type_argument); } } // The finalized type argument vector needs num_type_arguments types. const intptr_t num_type_arguments = type_class.NumTypeArguments(); // The type class has num_type_parameters type parameters. const intptr_t num_type_parameters = type_class.NumTypeParameters(); // Initialize the type argument vector. // Check the number of parsed type arguments, if any. // Specifying no type arguments indicates a raw type, which is not an error. // However, type parameter bounds are checked below, even for a raw type. if (!arguments.IsNull() && (arguments.Length() != num_type_parameters)) { // Wrong number of type arguments. The type is malformed. if (FLAG_error_on_bad_type) { const Script& script = Script::Handle(cls.script()); const String& type_class_name = String::Handle(type_class.Name()); ReportError(Error::Handle(), // No previous error. script, parameterized_type.token_pos(), "wrong number of type arguments for class '%s'", type_class_name.ToCString()); } // Make the type raw and continue without reporting any error. // A static warning should have been reported. arguments = AbstractTypeArguments::null(); parameterized_type.set_arguments(arguments); } // The full type argument vector consists of the type arguments of the // super types of type_class, which may be initialized from the parsed // type arguments, followed by the parsed type arguments. TypeArguments& full_arguments = TypeArguments::Handle(); Error& bound_error = Error::Handle(); if (num_type_arguments > 0) { // If no type arguments were parsed and if the super types do not prepend // type arguments to the vector, we can leave the vector as null. if (!arguments.IsNull() || (num_type_arguments > num_type_parameters)) { full_arguments = TypeArguments::New(num_type_arguments); // Copy the parsed type arguments at the correct offset in the full type // argument vector. const intptr_t offset = num_type_arguments - num_type_parameters; AbstractType& type_arg = AbstractType::Handle(Type::DynamicType()); for (intptr_t i = 0; i < offset; i++) { // Temporarily set the type arguments of the super classes to dynamic. full_arguments.SetTypeAt(i, type_arg); } for (intptr_t i = 0; i < num_type_parameters; i++) { // If no type parameters were provided, a raw type is desired, so we // create a vector of dynamic. if (!arguments.IsNull()) { type_arg = arguments.TypeAt(i); } ASSERT(type_arg.IsFinalized()); // Index of type parameter is adjusted. full_arguments.SetTypeAt(offset + i, type_arg); } // Replace the compile-time argument vector (of length zero or // num_type_parameters) of this type being finalized with the still // unfinalized run-time argument vector (of length num_type_arguments). // This type being finalized may be recursively reached via bounds // checking, in which case type arguments of super classes will be seen // as dynamic. parameterized_type.set_arguments(full_arguments); // If the type class is a signature class, the full argument vector // must include the argument vector of the super type. // If the signature class is a function type alias, it is also the owner // of its signature function and no super type is involved. // If the signature class is canonical (not an alias), the owner of its // signature function may either be an alias or the enclosing class of a // local function, in which case the super type of the enclosing class is // also considered when filling up the argument vector. if (type_class.IsSignatureClass()) { const Function& signature_fun = Function::Handle(type_class.signature_function()); ASSERT(!signature_fun.is_static()); const Class& sig_fun_owner = Class::Handle(signature_fun.Owner()); FinalizeTypeArguments( sig_fun_owner, full_arguments, finalization, &bound_error); CheckTypeArgumentBounds(sig_fun_owner, full_arguments, &bound_error); } else { FinalizeTypeArguments( type_class, full_arguments, finalization, &bound_error); CheckTypeArgumentBounds(type_class, full_arguments, &bound_error); } if (full_arguments.IsRaw(num_type_arguments)) { // The parameterized_type is raw. Set its argument vector to null, which // is more efficient in type tests. full_arguments = TypeArguments::null(); } else if (finalization >= kCanonicalize) { // FinalizeTypeArguments can modify 'full_arguments', // canonicalize afterwards. full_arguments ^= full_arguments.Canonicalize(); } parameterized_type.set_arguments(full_arguments); } else { ASSERT(full_arguments.IsNull()); // Use null vector for raw type. } } // Self referencing types may get finalized indirectly. if (!parameterized_type.IsFinalized()) { // Mark the type as finalized. parameterized_type.SetIsFinalized(); } // If the type class is a signature class, we are currently finalizing a // signature type, i.e. finalizing the result type and parameter types of the // signature function of this signature type. // We do this after marking this type as finalized in order to allow a // function type to refer to itself via its parameter types and result type. if (type_class.IsSignatureClass()) { // The class may be created while parsing a function body, after all // pending classes have already been finalized. FinalizeTypesInClass(type_class); } // If a bound error occurred, return a BoundedType with a malformed bound. // The malformed bound will be ignored in production mode. if (!bound_error.IsNull()) { // No compile-time error during finalization. const String& parameterized_type_name = String::Handle( parameterized_type.UserVisibleName()); const Type& malformed_bound = Type::Handle( NewFinalizedMalformedType(bound_error, cls, parameterized_type.token_pos(), "type '%s' has an out of bound type argument", parameterized_type_name.ToCString())); return BoundedType::New(parameterized_type, malformed_bound, TypeParameter::Handle()); } if (finalization >= kCanonicalize) { return parameterized_type.Canonicalize(); } else { return parameterized_type.raw(); } } void ClassFinalizer::ResolveAndFinalizeSignature(const Class& cls, const Function& function) { // Resolve result type. AbstractType& type = AbstractType::Handle(function.result_type()); // It is not a compile time error if this name does not resolve to a class or // interface. ResolveType(cls, type, kCanonicalize); type = FinalizeType(cls, type, kCanonicalize); // A malformed result type is mapped to dynamic. ASSERT(!type.IsMalformed()); function.set_result_type(type); // Resolve formal parameter types. const intptr_t num_parameters = function.NumParameters(); for (intptr_t i = 0; i < num_parameters; i++) { type = function.ParameterTypeAt(i); ResolveType(cls, type, kCanonicalize); type = FinalizeType(cls, type, kCanonicalize); // A malformed parameter type is mapped to dynamic. ASSERT(!type.IsMalformed()); function.SetParameterTypeAt(i, type); } } // Check if an instance field, getter, or method of same name exists // in any super class. static RawClass* FindSuperOwnerOfInstanceMember(const Class& cls, const String& name, const String& getter_name) { Class& super_class = Class::Handle(); Function& function = Function::Handle(); Field& field = Field::Handle(); super_class = cls.SuperClass(); while (!super_class.IsNull()) { function = super_class.LookupFunction(name); if (!function.IsNull() && !function.is_static()) { return super_class.raw(); } function = super_class.LookupFunction(getter_name); if (!function.IsNull() && !function.is_static()) { return super_class.raw(); } field = super_class.LookupField(name); if (!field.IsNull() && !field.is_static()) { return super_class.raw(); } super_class = super_class.SuperClass(); } return Class::null(); } // Check if an instance method of same name exists in any super class. static RawClass* FindSuperOwnerOfFunction(const Class& cls, const String& name) { Class& super_class = Class::Handle(); Function& function = Function::Handle(); super_class = cls.SuperClass(); while (!super_class.IsNull()) { function = super_class.LookupFunction(name); if (!function.IsNull() && !function.is_static() && !function.IsMethodExtractor()) { return super_class.raw(); } super_class = super_class.SuperClass(); } return Class::null(); } // Resolve the upper bounds of the type parameters of class cls. void ClassFinalizer::ResolveUpperBounds(const Class& cls) { const intptr_t num_type_params = cls.NumTypeParameters(); TypeParameter& type_param = TypeParameter::Handle(); AbstractType& bound = AbstractType::Handle(); const AbstractTypeArguments& type_params = AbstractTypeArguments::Handle(cls.type_parameters()); ASSERT((type_params.IsNull() && (num_type_params == 0)) || (type_params.Length() == num_type_params)); // In a first pass, resolve all bounds. This guarantees that finalization // of mutually referencing bounds will not encounter an unresolved bound. for (intptr_t i = 0; i < num_type_params; i++) { type_param ^= type_params.TypeAt(i); bound = type_param.bound(); ResolveType(cls, bound, kCanonicalize); } } // Finalize the upper bounds of the type parameters of class cls. void ClassFinalizer::FinalizeUpperBounds(const Class& cls) { const intptr_t num_type_params = cls.NumTypeParameters(); TypeParameter& type_param = TypeParameter::Handle(); AbstractType& bound = AbstractType::Handle(); const AbstractTypeArguments& type_params = AbstractTypeArguments::Handle(cls.type_parameters()); ASSERT((type_params.IsNull() && (num_type_params == 0)) || (type_params.Length() == num_type_params)); for (intptr_t i = 0; i < num_type_params; i++) { type_param ^= type_params.TypeAt(i); bound = type_param.bound(); if (bound.IsFinalized() || bound.IsBeingFinalized()) { // A bound involved in F-bounded quantification may form a cycle. continue; } bound = FinalizeType(cls, bound, kCanonicalize); type_param.set_bound(bound); } } void ClassFinalizer::ResolveAndFinalizeMemberTypes(const Class& cls) { // Note that getters and setters are explicitly listed as such in the list of // functions of a class, so we do not need to consider fields as implicitly // generating getters and setters. // Most overriding conflicts are only static warnings, i.e. they are not // reported as compile-time errors by the vm. However, signature conflicts in // overrides can be reported if the flag --error_on_bad_override is specified. // Static warning examples are: // - a static getter 'v' conflicting with an inherited instance setter 'v='. // - a static setter 'v=' conflicting with an inherited instance member 'v'. // - an instance member 'v' conflicting with an accessible static member 'v' // or 'v=' of a super class (except that an instance method 'v' does not // conflict with an accessible static setter 'v=' of a super class). // The compile-time errors we report are: // - a static member 'v' conflicting with an inherited instance member 'v'. // - a static setter 'v=' conflicting with an inherited instance setter 'v='. // - an instance method conflicting with an inherited instance field or // instance getter. // - an instance field or instance getter conflicting with an inherited // instance method. // Resolve type of fields and check for conflicts in super classes. Array& array = Array::Handle(cls.fields()); Field& field = Field::Handle(); AbstractType& type = AbstractType::Handle(); String& name = String::Handle(); String& getter_name = String::Handle(); String& setter_name = String::Handle(); Class& super_class = Class::Handle(); const intptr_t num_fields = array.Length(); for (intptr_t i = 0; i < num_fields; i++) { field ^= array.At(i); type = field.type(); ResolveType(cls, type, kCanonicalize); type = FinalizeType(cls, type, kCanonicalize); field.set_type(type); name = field.name(); if (field.is_static()) { getter_name = Field::GetterSymbol(name); super_class = FindSuperOwnerOfInstanceMember(cls, name, getter_name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, field.token_pos(), "static field '%s' of class '%s' conflicts with " "instance member '%s' of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } // An implicit setter is not generated for a static field, therefore, we // cannot rely on the code below handling the static setter case to report // a conflict with an instance setter. So we check explicitly here. setter_name = Field::SetterSymbol(name); super_class = FindSuperOwnerOfFunction(cls, setter_name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, field.token_pos(), "static field '%s' of class '%s' conflicts with " "instance setter '%s=' of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } else { // Instance field. Check whether the field overrides a method // (but not getter). super_class = FindSuperOwnerOfFunction(cls, name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, field.token_pos(), "field '%s' of class '%s' conflicts with method '%s' " "of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } if (field.is_static() && (field.is_const() || field.is_final()) && (field.value() != Object::null()) && (field.value() != Object::sentinel().raw())) { // The parser does not preset the value if the type is a type parameter or // is parameterized unless the value is null. Error& malformed_error = Error::Handle(); if (type.IsMalformed()) { malformed_error = type.malformed_error(); } else { ASSERT(type.IsInstantiated()); } const Instance& const_value = Instance::Handle(field.value()); if (!malformed_error.IsNull() || (!type.IsDynamicType() && !const_value.IsInstanceOf(type, AbstractTypeArguments::Handle(), &malformed_error))) { if (FLAG_error_on_bad_type) { const AbstractType& const_value_type = AbstractType::Handle( const_value.GetType()); const String& const_value_type_name = String::Handle( const_value_type.UserVisibleName()); const String& type_name = String::Handle(type.UserVisibleName()); const Script& script = Script::Handle(cls.script()); ReportError(malformed_error, script, field.token_pos(), "error initializing static %s field '%s': " "type '%s' is not a subtype of type '%s'", field.is_const() ? "const" : "final", name.ToCString(), const_value_type_name.ToCString(), type_name.ToCString()); } else { // Do not report an error yet, even in checked mode, since the field // may not actually be used. // Also, we may be generating a snapshot in production mode that will // later be executed in checked mode, in which case an error needs to // be reported, should the field be accessed. // Therefore, we undo the optimization performed by the parser, i.e. // we create an implicit static final getter and reset the field value // to the sentinel value. const Function& getter = Function::Handle( Function::New(getter_name, RawFunction::kImplicitStaticFinalGetter, /* is_static = */ true, /* is_const = */ field.is_const(), /* is_abstract = */ false, /* is_external = */ false, cls, field.token_pos())); getter.set_result_type(type); cls.AddFunction(getter); field.set_value(Instance::Handle(Object::sentinel().raw())); } } } } // Collect interfaces, super interfaces, and super classes of this class. const GrowableObjectArray& interfaces = GrowableObjectArray::Handle(GrowableObjectArray::New()); CollectInterfaces(cls, interfaces); // Include superclasses in list of interfaces and super interfaces. super_class = cls.SuperClass(); while (!super_class.IsNull()) { interfaces.Add(super_class); CollectInterfaces(super_class, interfaces); super_class = super_class.SuperClass(); } // Resolve function signatures and check for conflicts in super classes and // interfaces. array = cls.functions(); Function& function = Function::Handle(); Function& overridden_function = Function::Handle(); const intptr_t num_functions = array.Length(); Error& error = Error::Handle(); for (intptr_t i = 0; i < num_functions; i++) { function ^= array.At(i); ResolveAndFinalizeSignature(cls, function); name = function.name(); if (FLAG_error_on_bad_override && // Report signature conflicts only. !function.is_static() && !function.IsConstructor()) { // A constructor cannot override anything. for (int i = 0; i < interfaces.Length(); i++) { super_class ^= interfaces.At(i); overridden_function = super_class.LookupDynamicFunction(name); if (!overridden_function.IsNull() && !function.HasCompatibleParametersWith(overridden_function, &error)) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(error, script, function.token_pos(), "class '%s' overrides method '%s' of super class '%s' " "with incompatible parameters", class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } } if (function.IsSetterFunction() || function.IsImplicitSetterFunction()) { if (function.is_static()) { super_class = FindSuperOwnerOfFunction(cls, name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, function.token_pos(), "static setter '%s=' of class '%s' conflicts with " "instance setter '%s=' of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } continue; } if (function.IsGetterFunction() || function.IsImplicitGetterFunction()) { getter_name = name.raw(); name = Field::NameFromGetter(getter_name); } else { getter_name = Field::GetterSymbol(name); } if (function.is_static()) { super_class = FindSuperOwnerOfInstanceMember(cls, name, getter_name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, function.token_pos(), "static %s '%s' of class '%s' conflicts with " "instance member '%s' of super class '%s'", (function.IsGetterFunction() || function.IsImplicitGetterFunction()) ? "getter" : "method", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } // The function may be a still unresolved redirecting factory. Do not yet // try to resolve it in order to avoid cycles in class finalization. } else if (function.IsGetterFunction() || function.IsImplicitGetterFunction()) { super_class = FindSuperOwnerOfFunction(cls, name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, function.token_pos(), "getter '%s' of class '%s' conflicts with " "method '%s' of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } else if (!function.IsSetterFunction() && !function.IsImplicitSetterFunction()) { // A function cannot conflict with a setter, since they cannot // have the same name. Thus, we do not need to check setters. super_class = FindSuperOwnerOfFunction(cls, getter_name); if (!super_class.IsNull()) { const String& class_name = String::Handle(cls.Name()); const String& super_class_name = String::Handle(super_class.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, function.token_pos(), "method '%s' of class '%s' conflicts with " "getter '%s' of super class '%s'", name.ToCString(), class_name.ToCString(), name.ToCString(), super_class_name.ToCString()); } } } } // Copy the type parameters of the super and mixin classes to the // mixin application class. Change type arguments of super type and of // interfaces to refer to the respective type parameters of the mixin // application class. void ClassFinalizer::CloneTypeParameters(const Class& mixin_app_class) { ASSERT(mixin_app_class.type_parameters() == AbstractTypeArguments::null()); const AbstractType& super_type = AbstractType::Handle(mixin_app_class.super_type()); ASSERT(super_type.IsResolved()); const Class& super_class = Class::Handle(super_type.type_class()); const Type& mixin_type = Type::Handle(mixin_app_class.mixin()); const Class& mixin_class = Class::Handle(mixin_type.type_class()); const int num_super_parameters = super_class.NumTypeParameters(); const int num_mixin_parameters = mixin_class.NumTypeParameters(); if ((num_super_parameters + num_mixin_parameters) == 0) { return; } // First, clone the super class type parameters. Rename them so that // there can be no name conflict between the parameters of the super // class and the mixin class. const TypeArguments& cloned_type_params = TypeArguments::Handle( TypeArguments::New(num_super_parameters + num_mixin_parameters)); TypeParameter& param = TypeParameter::Handle(); TypeParameter& cloned_param = TypeParameter::Handle(); String& param_name = String::Handle(); AbstractType& param_bound = AbstractType::Handle(); int cloned_index = 0; if (num_super_parameters > 0) { const TypeArguments& super_params = TypeArguments::Handle(super_class.type_parameters()); const TypeArguments& super_type_args = TypeArguments::Handle(TypeArguments::New(num_super_parameters)); for (int i = 0; i < num_super_parameters; i++) { param ^= super_params.TypeAt(i); param_name = param.name(); param_bound = param.bound(); // TODO(hausner): handle type bounds. if (!param_bound.IsObjectType()) { const Script& script = Script::Handle(mixin_app_class.script()); ReportError(Error::Handle(), // No previous error. script, param.token_pos(), "type parameter '%s': type bounds not yet" " implemented for mixins\n", param_name.ToCString()); } param_name = String::Concat(param_name, Symbols::Backtick()); param_name = Symbols::New(param_name); cloned_param = TypeParameter::New(mixin_app_class, cloned_index, param_name, param_bound, param.token_pos()); cloned_type_params.SetTypeAt(cloned_index, cloned_param); // Change the type arguments of the super type to refer to the // cloned type parameters of the mixin application class. super_type_args.SetTypeAt(cloned_index, cloned_param); cloned_index++; } // TODO(hausner): May need to handle BoundedType here. ASSERT(super_type.IsType()); Type::Cast(super_type).set_arguments(super_type_args); ASSERT(!super_type.IsFinalized()); } // Second, clone the type parameters of the mixin class. // We need to retain the parameter names of the mixin class // since the code that will be compiled in the context of the // mixin application class may refer to the type parameters // with that name. if (num_mixin_parameters > 0) { const TypeArguments& mixin_params = TypeArguments::Handle(mixin_class.type_parameters()); const TypeArguments& interface_type_args = TypeArguments::Handle( TypeArguments::New(num_mixin_parameters)); for (int i = 0; i < num_mixin_parameters; i++) { param ^= mixin_params.TypeAt(i); param_name = param.name(); param_bound = param.bound(); // TODO(hausner): handle type bounds. if (!param_bound.IsObjectType()) { const Script& script = Script::Handle(mixin_app_class.script()); ReportError(Error::Handle(), // No previous error. script, param.token_pos(), "type parameter '%s': type bounds not yet" " implemented for mixins\n", param_name.ToCString()); } cloned_param = TypeParameter::New(mixin_app_class, cloned_index, param_name, param_bound, param.token_pos()); cloned_type_params.SetTypeAt(cloned_index, cloned_param); interface_type_args.SetTypeAt(i, cloned_param); cloned_index++; } // Lastly, change the type arguments of the single interface type to // refer to the cloned type parameters of the mixin application class. Array& interface_types = Array::Handle(mixin_app_class.interfaces()); ASSERT(interface_types.Length() == 1); AbstractType& interface_type = AbstractType::Handle(); interface_type ^= interface_types.At(0); ASSERT(interface_type.IsResolved()); // TODO(hausner): May need to handle BoundedType here. ASSERT(interface_type.IsType()); Type::Cast(interface_type).set_arguments(interface_type_args); ASSERT(!interface_type.IsFinalized()); } mixin_app_class.set_type_parameters(cloned_type_params); } void ClassFinalizer::ApplyMixinType(const Class& mixin_app_class) { if (mixin_app_class.is_mixin_type_applied()) { return; } const Type& mixin_type = Type::Handle(mixin_app_class.mixin()); ASSERT(!mixin_type.IsNull()); ASSERT(mixin_type.HasResolvedTypeClass()); const Class& mixin_cls = Class::Handle(mixin_type.type_class()); if (FLAG_trace_class_finalization) { OS::Print("Applying mixin type '%s' to %s at pos %" Pd "\n", String::Handle(mixin_type.Name()).ToCString(), mixin_app_class.ToCString(), mixin_app_class.token_pos()); } // Check that the super class of the mixin class is extending // class Object. const AbstractType& mixin_super_type = AbstractType::Handle(mixin_cls.super_type()); if (!mixin_super_type.IsObjectType()) { const Script& script = Script::Handle(mixin_app_class.script()); const String& class_name = String::Handle(mixin_cls.Name()); ReportError(Error::Handle(), // No previous error. script, mixin_app_class.token_pos(), "mixin class '%s' must extend class Object", class_name.ToCString()); } // Copy type parameters to mixin application class. CloneTypeParameters(mixin_app_class); if (FLAG_trace_class_finalization) { OS::Print("Done applying mixin type '%s' to class '%s' %s extending '%s'\n", String::Handle(mixin_type.Name()).ToCString(), String::Handle(mixin_app_class.Name()).ToCString(), TypeArguments::Handle( mixin_app_class.type_parameters()).ToCString(), AbstractType::Handle(mixin_app_class.super_type()).ToCString()); } mixin_app_class.set_is_mixin_type_applied(); } void ClassFinalizer::CreateForwardingConstructors( const Class& mixin_app, const GrowableObjectArray& cloned_funcs) { const String& mixin_name = String::Handle(mixin_app.Name()); const Class& super_class = Class::Handle(mixin_app.SuperClass()); const String& super_name = String::Handle(super_class.Name()); const Type& dynamic_type = Type::Handle(Type::DynamicType()); const Array& functions = Array::Handle(super_class.functions()); const intptr_t num_functions = functions.Length(); Function& func = Function::Handle(); for (intptr_t i = 0; i < num_functions; i++) { func ^= functions.At(i); if (func.IsConstructor()) { // Build constructor name from mixin application class name // and name of cloned super class constructor. String& ctor_name = String::Handle(func.name()); ctor_name = String::SubString(ctor_name, super_name.Length()); String& clone_name = String::Handle(String::Concat(mixin_name, ctor_name)); clone_name = Symbols::New(clone_name); const Function& clone = Function::Handle( Function::New(clone_name, func.kind(), func.is_static(), false, // Not const. false, // Not abstract. false, // Not external. mixin_app, mixin_app.token_pos())); clone.set_num_fixed_parameters(func.num_fixed_parameters()); clone.SetNumOptionalParameters(func.NumOptionalParameters(), func.HasOptionalPositionalParameters()); clone.set_result_type(dynamic_type); const int num_parameters = func.NumParameters(); // The cloned ctor shares the parameter names array with the // original. const Array& parameter_names = Array::Handle(func.parameter_names()); ASSERT(parameter_names.Length() == num_parameters); clone.set_parameter_names(parameter_names); // The parameter types of the cloned constructor are 'dynamic'. clone.set_parameter_types(Array::Handle(Array::New(num_parameters))); for (intptr_t n = 0; n < num_parameters; n++) { clone.SetParameterTypeAt(n, dynamic_type); } cloned_funcs.Add(clone); } } } void ClassFinalizer::ApplyMixinMembers(const Class& cls) { Isolate* isolate = Isolate::Current(); const Type& mixin_type = Type::Handle(isolate, cls.mixin()); ASSERT(!mixin_type.IsNull()); ASSERT(mixin_type.HasResolvedTypeClass()); const Class& mixin_cls = Class::Handle(isolate, mixin_type.type_class()); mixin_cls.EnsureIsFinalized(isolate); if (FLAG_trace_class_finalization) { OS::Print("Applying mixin members of %s to %s at pos %" Pd "\n", mixin_cls.ToCString(), cls.ToCString(), cls.token_pos()); } const GrowableObjectArray& cloned_funcs = GrowableObjectArray::Handle(isolate, GrowableObjectArray::New()); CreateForwardingConstructors(cls, cloned_funcs); Array& functions = Array::Handle(isolate); Function& func = Function::Handle(isolate); // The parser creates the mixin application class with no functions. ASSERT((functions = cls.functions(), functions.Length() == 0)); // Now clone the functions from the mixin class. functions = mixin_cls.functions(); const intptr_t num_functions = functions.Length(); for (int i = 0; i < num_functions; i++) { func ^= functions.At(i); if (func.IsConstructor()) { // A mixin class must not have explicit constructors. if (!func.IsImplicitConstructor()) { const Script& script = Script::Handle(isolate, cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "mixin class '%s' must not have constructors\n", String::Handle(isolate, mixin_cls.Name()).ToCString()); } continue; // Skip the implicit constructor. } if (!func.is_static()) { func = func.Clone(cls); cloned_funcs.Add(func); } } functions = Array::MakeArray(cloned_funcs); cls.SetFunctions(functions); // Now clone the fields from the mixin class. There should be no // existing fields in the mixin application class. ASSERT(Array::Handle(cls.fields()).Length() == 0); Array& fields = Array::Handle(isolate, mixin_cls.fields()); Field& field = Field::Handle(isolate); const GrowableObjectArray& cloned_fields = GrowableObjectArray::Handle(isolate, GrowableObjectArray::New()); const intptr_t num_fields = fields.Length(); for (int i = 0; i < num_fields; i++) { field ^= fields.At(i); if (!field.is_static()) { field = field.Clone(cls); cloned_fields.Add(field); } } fields = Array::MakeArray(cloned_fields); cls.SetFields(fields); if (FLAG_trace_class_finalization) { OS::Print("done applying mixin members of %s to %s\n", mixin_cls.ToCString(), cls.ToCString()); } } void ClassFinalizer::FinalizeTypesInClass(const Class& cls) { HANDLESCOPE(Isolate::Current()); if (cls.is_type_finalized()) { return; } if (FLAG_trace_class_finalization) { OS::Print("Finalize types in %s\n", cls.ToCString()); } if (!IsSuperCycleFree(cls)) { const String& name = String::Handle(cls.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "class '%s' has a cycle in its superclass relationship", name.ToCString()); } // Finalize super class. const Class& super_class = Class::Handle(cls.SuperClass()); if (!super_class.IsNull()) { FinalizeTypesInClass(super_class); } // Finalize type parameters before finalizing the super type. FinalizeTypeParameters(cls); ResolveUpperBounds(cls); // Finalize super type. AbstractType& super_type = AbstractType::Handle(cls.super_type()); if (!super_type.IsNull()) { // In case of a bound error in the super type in production mode, the // finalized super type will be a BoundedType with a malformed bound. // It should not be a problem if the class is written to a snapshot and // later executed in checked mode. Note that the finalized type argument // vector of any type of the base class will contain a BoundedType for the // out of bound type argument. super_type = FinalizeType(cls, super_type, kCanonicalizeWellFormed); cls.set_super_type(super_type); } if (cls.IsSignatureClass()) { // Check for illegal self references. GrowableArray visited_aliases; if (!IsAliasCycleFree(cls, &visited_aliases)) { const String& name = String::Handle(cls.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "typedef '%s' illegally refers to itself", name.ToCString()); } cls.set_is_type_finalized(); // The type parameters of signature classes may have bounds. FinalizeUpperBounds(cls); // Resolve and finalize the result and parameter types of the signature // function of this signature class. const Function& sig_function = Function::Handle(cls.signature_function()); ResolveAndFinalizeSignature(cls, sig_function); // Resolve and finalize the signature type of this signature class. const Type& sig_type = Type::Handle(cls.SignatureType()); FinalizeType(cls, sig_type, kCanonicalizeWellFormed); return; } // Finalize interface types (but not necessarily interface classes). Array& interface_types = Array::Handle(cls.interfaces()); AbstractType& interface_type = AbstractType::Handle(); AbstractType& seen_interf = AbstractType::Handle(); for (intptr_t i = 0; i < interface_types.Length(); i++) { interface_type ^= interface_types.At(i); interface_type = FinalizeType(cls, interface_type, kCanonicalizeWellFormed); interface_types.SetAt(i, interface_type); // Check whether the interface is duplicated. We need to wait with // this check until the super type and interface types are finalized, // so that we can use Type::Equals() for the test. ASSERT(interface_type.IsFinalized()); ASSERT(super_type.IsNull() || super_type.IsFinalized()); if (!super_type.IsNull() && interface_type.Equals(super_type)) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "super type '%s' may not be listed in " "implements clause of class '%s'", String::Handle(super_type.Name()).ToCString(), String::Handle(cls.Name()).ToCString()); } for (intptr_t j = 0; j < i; j++) { seen_interf ^= interface_types.At(j); if (interface_type.Equals(seen_interf)) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "interface '%s' appears twice in " "implements clause of class '%s'", String::Handle(interface_type.Name()).ToCString(), String::Handle(cls.Name()).ToCString()); } } } // Mark as type finalized before resolving type parameter upper bounds // in order to break cycles. cls.set_is_type_finalized(); // Finalize bounds even if running in production mode, so that a snapshot // contains them. FinalizeUpperBounds(cls); // Add this class to the direct subclasses of the superclass, unless the // superclass is Object. if (!super_type.IsNull() && !super_type.IsObjectType()) { ASSERT(!super_class.IsNull()); super_class.AddDirectSubclass(cls); } // A top level class is parsed eagerly so just finalize it. if (cls.IsTopLevel()) { FinalizeClass(cls); } else { // This class should not contain any fields or functions yet, because it has // not been compiled yet. Since 'ResolveAndFinalizeMemberTypes(cls)' has not // been called yet, unfinalized member types could choke the snapshotter. ASSERT(Array::Handle(cls.fields()).Length() == 0); ASSERT(Array::Handle(cls.functions()).Length() == 0); } } void ClassFinalizer::FinalizeClass(const Class& cls) { HANDLESCOPE(Isolate::Current()); if (cls.is_finalized()) { return; } if (FLAG_trace_class_finalization) { OS::Print("Finalize %s\n", cls.ToCString()); } if (cls.IsMixinApplication()) { // Copy instance methods and fields from the mixin class. // This has to happen before the check whether the methods of // the class conflict with inherited methods. ApplyMixinMembers(cls); } // Ensure super class is finalized. const Class& super = Class::Handle(cls.SuperClass()); if (!super.IsNull()) { FinalizeClass(super); } // Mark as parsed and finalized. cls.Finalize(); // Mixin typedef classes may still lack their implicit constructor. // TODO(regis): Implement mixin typedefs with an alias class. if (cls.is_synthesized_class() && (cls.functions() == Object::empty_array().raw())) { Parser::AddImplicitConstructor(cls); } // Every class should have at least a constructor, unless it is a top level // class or a signature class. ASSERT(cls.IsTopLevel() || cls.IsSignatureClass() || (Array::Handle(cls.functions()).Length() > 0)); // Resolve and finalize all member types. ResolveAndFinalizeMemberTypes(cls); // Run additional checks after all types are finalized. if (cls.is_const()) { CheckForLegalConstClass(cls); } } bool ClassFinalizer::IsSuperCycleFree(const Class& cls) { Class& test1 = Class::Handle(cls.raw()); Class& test2 = Class::Handle(cls.SuperClass()); // A finalized class has been checked for cycles. // Using the hare and tortoise algorithm for locating cycles. while (!test1.is_type_finalized() && !test2.IsNull() && !test2.is_type_finalized()) { if (test1.raw() == test2.raw()) { // Found a cycle. return false; } test1 = test1.SuperClass(); test2 = test2.SuperClass(); if (!test2.IsNull()) { test2 = test2.SuperClass(); } } // No cycles. return true; } // Helper function called by IsAliasCycleFree. bool ClassFinalizer::IsParameterTypeCycleFree( const Class& cls, const AbstractType& type, GrowableArray* visited) { ASSERT(visited != NULL); ResolveType(cls, type, kCanonicalize); if (type.IsType() && !type.IsMalformed()) { const Class& type_class = Class::Handle(type.type_class()); if (!type_class.is_type_finalized() && type_class.IsSignatureClass() && !IsAliasCycleFree(type_class, visited)) { return false; } const AbstractTypeArguments& type_args = AbstractTypeArguments::Handle( type.arguments()); if (!type_args.IsNull()) { AbstractType& type_arg = AbstractType::Handle(); for (intptr_t i = 0; i < type_args.Length(); i++) { type_arg = type_args.TypeAt(i); if (!IsParameterTypeCycleFree(cls, type_arg, visited)) { return false; } } } } return true; } // Returns false if the function type alias illegally refers to itself. bool ClassFinalizer::IsAliasCycleFree(const Class& cls, GrowableArray* visited) { ASSERT(cls.IsSignatureClass()); ASSERT(!cls.is_type_finalized()); ASSERT(visited != NULL); const intptr_t cls_index = cls.id(); for (int i = 0; i < visited->length(); i++) { if ((*visited)[i] == cls_index) { // We have already visited alias 'cls'. We found a cycle. return false; } } // Visit the result type and parameter types of this signature type. visited->Add(cls.id()); const Function& function = Function::Handle(cls.signature_function()); // Check class of result type. AbstractType& type = AbstractType::Handle(function.result_type()); if (!IsParameterTypeCycleFree(cls, type, visited)) { return false; } // Check classes of formal parameter types. const intptr_t num_parameters = function.NumParameters(); for (intptr_t i = 0; i < num_parameters; i++) { type = function.ParameterTypeAt(i); if (!IsParameterTypeCycleFree(cls, type, visited)) { return false; } } visited->RemoveLast(); return true; } void ClassFinalizer::CollectTypeArguments( const Class& cls, const Type& type, const GrowableObjectArray& collected_args) { ASSERT(type.HasResolvedTypeClass()); Class& type_class = Class::Handle(type.type_class()); AbstractTypeArguments& type_args = AbstractTypeArguments::Handle(type.arguments()); const intptr_t num_type_parameters = type_class.NumTypeParameters(); const intptr_t num_type_arguments = type_args.IsNull() ? 0 : type_args.Length(); AbstractType& arg = AbstractType::Handle(); if (num_type_arguments > 0) { if (num_type_arguments == num_type_parameters) { for (int i = 0; i < num_type_arguments; i++) { arg = type_args.TypeAt(i); collected_args.Add(arg); } return; } if (FLAG_error_on_bad_type) { const Script& script = Script::Handle(cls.script()); const String& type_class_name = String::Handle(type_class.Name()); ReportError(Error::Handle(), // No previous error. script, type.token_pos(), "wrong number of type arguments for class '%s'", type_class_name.ToCString()); } // Discard provided type arguments and treat type as raw. } // Fill arguments with type dynamic. for (int i = 0; i < num_type_parameters; i++) { arg = Type::DynamicType(); collected_args.Add(arg); } } RawType* ClassFinalizer::ResolveMixinAppType(const Class& cls, const MixinAppType& mixin_app) { // Resolve super type and all mixin types. const GrowableObjectArray& type_args = GrowableObjectArray::Handle(GrowableObjectArray::New()); AbstractType& type = AbstractType::Handle(mixin_app.SuperType()); ResolveType(cls, type, kCanonicalizeWellFormed); ASSERT(type.HasResolvedTypeClass()); // TODO(hausner): May need to handle BoundedType here. ASSERT(type.IsType()); CollectTypeArguments(cls, Type::Cast(type), type_args); Class& mixin_app_class = Class::Handle(); const intptr_t depth = mixin_app.Depth(); for (int i = 0; i < depth; i++) { mixin_app_class = mixin_app.MixinAppAt(i); type = mixin_app_class.mixin(); ASSERT(!type.IsNull()); ResolveType(cls, type, kCanonicalizeWellFormed); ASSERT(type.HasResolvedTypeClass()); ASSERT(type.IsType()); CollectTypeArguments(cls, Type::Cast(type), type_args); } const TypeArguments& mixin_app_args = TypeArguments::Handle(TypeArguments::New(type_args.Length())); for (int i = 0; i < type_args.Length(); i++) { type ^= type_args.At(i); mixin_app_args.SetTypeAt(i, type); } if (FLAG_trace_class_finalization) { OS::Print("ResolveMixinAppType: mixin appl type args: %s\n", mixin_app_args.ToCString()); } // The mixin application class at depth k is a subclass of mixin application // class at depth k - 1. Build a new super type with the class at the highest // depth (the last one processed by the loop above) as the type class and the // collected type arguments from the super type and all mixin types. // This super type replaces the MixinAppType object in the class that extends // the mixin application. return Type::New(mixin_app_class, mixin_app_args, mixin_app.token_pos()); } // Recursively walks the graph of explicitly declared super type and // interfaces, resolving unresolved super types and interfaces. // Reports an error if there is an interface reference that cannot be // resolved, or if there is a cycle in the graph. We detect cycles by // remembering interfaces we've visited in each path through the // graph. If we visit an interface a second time on a given path, // we found a loop. void ClassFinalizer::ResolveSuperTypeAndInterfaces( const Class& cls, GrowableArray* visited) { ASSERT(visited != NULL); if (FLAG_trace_class_finalization) { OS::Print("Resolving super and interfaces: %s\n", cls.ToCString()); } const intptr_t cls_index = cls.id(); for (int i = 0; i < visited->length(); i++) { if ((*visited)[i] == cls_index) { // We have already visited class 'cls'. We found a cycle. const String& class_name = String::Handle(cls.Name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "cyclic reference found for class '%s'", class_name.ToCString()); } } // If the class/interface has no explicit super class/interfaces // and is not a mixin application, we are done. AbstractType& super_type = AbstractType::Handle(cls.super_type()); Array& super_interfaces = Array::Handle(cls.interfaces()); if ((super_type.IsNull() || super_type.IsObjectType()) && (super_interfaces.Length() == 0)) { return; } if (super_type.IsMixinAppType()) { const MixinAppType& mixin_app_type = MixinAppType::Cast(super_type); super_type = ResolveMixinAppType(cls, mixin_app_type); cls.set_super_type(super_type); } // If cls belongs to core lib, restrictions about allowed interfaces // are lifted. const bool cls_belongs_to_core_lib = cls.library() == Library::CoreLibrary(); // Resolve and check the super type and interfaces of cls. visited->Add(cls_index); AbstractType& interface = AbstractType::Handle(); Class& interface_class = Class::Handle(); // Resolve super type. Failures lead to a longjmp. ResolveType(cls, super_type, kCanonicalizeWellFormed); if (super_type.IsMalformed()) { ReportError(Error::Handle(super_type.malformed_error())); } if (super_type.IsDynamicType()) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "class '%s' may not extend 'dynamic'", String::Handle(cls.Name()).ToCString()); } interface_class = super_type.type_class(); if (interface_class.IsSignatureClass()) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "class '%s' may not extend function type alias '%s'", String::Handle(cls.Name()).ToCString(), String::Handle(super_type.UserVisibleName()).ToCString()); } // If cls belongs to core lib or to core lib's implementation, restrictions // about allowed interfaces are lifted. if (!cls_belongs_to_core_lib) { // Prevent extending core implementation classes. bool is_error = false; switch (interface_class.id()) { case kNumberCid: case kIntegerCid: // Class Integer, not int. case kSmiCid: case kMintCid: case kBigintCid: case kDoubleCid: // Class Double, not double. case kOneByteStringCid: case kTwoByteStringCid: case kExternalOneByteStringCid: case kExternalTwoByteStringCid: case kBoolCid: case kNullCid: case kArrayCid: case kImmutableArrayCid: case kGrowableObjectArrayCid: #define DO_NOT_EXTEND_TYPED_DATA_CLASSES(clazz) \ case kTypedData##clazz##Cid: \ case kTypedData##clazz##ViewCid: \ case kExternalTypedData##clazz##Cid: CLASS_LIST_TYPED_DATA(DO_NOT_EXTEND_TYPED_DATA_CLASSES) #undef DO_NOT_EXTEND_TYPED_DATA_CLASSES case kByteDataViewCid: case kWeakPropertyCid: is_error = true; break; default: { // Special case: classes for which we don't have a known class id. if (super_type.IsDoubleType() || super_type.IsIntType() || super_type.IsStringType()) { is_error = true; } break; } } if (is_error) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "'%s' is not allowed to extend '%s'", String::Handle(cls.Name()).ToCString(), String::Handle(interface_class.Name()).ToCString()); } } // Now resolve the super interfaces of the super type. ResolveSuperTypeAndInterfaces(interface_class, visited); // Resolve interfaces. Failures lead to a longjmp. for (intptr_t i = 0; i < super_interfaces.Length(); i++) { interface ^= super_interfaces.At(i); ResolveType(cls, interface, kCanonicalizeWellFormed); ASSERT(!interface.IsTypeParameter()); // Should be detected by parser. if (interface.IsMalformed()) { ReportError(Error::Handle(interface.malformed_error())); } if (interface.IsDynamicType()) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "'dynamic' may not be used as interface"); } interface_class = interface.type_class(); if (interface_class.IsSignatureClass()) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "function type alias '%s' may not be used as interface", String::Handle(interface_class.Name()).ToCString()); } // Verify that unless cls belongs to core lib, it cannot extend or implement // any of Null, bool, num, int, double, String, Function, dynamic. // The exception is signature classes, which are compiler generated and // represent a function type, therefore implementing the Function interface. if (!cls_belongs_to_core_lib) { if (interface.IsBoolType() || interface.IsNullType() || interface.IsNumberType() || interface.IsIntType() || interface.IsDoubleType() || interface.IsStringType() || interface.IsDynamicType()) { const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, cls.token_pos(), "'%s' is not allowed to extend or implement '%s'", String::Handle(cls.Name()).ToCString(), String::Handle(interface_class.Name()).ToCString()); } } interface_class.set_is_implemented(); // Now resolve the super interfaces. ResolveSuperTypeAndInterfaces(interface_class, visited); } visited->RemoveLast(); } // A class is marked as constant if it has one constant constructor. // A constant class can only have final instance fields. // Note: we must check for cycles before checking for const properties. void ClassFinalizer::CheckForLegalConstClass(const Class& cls) { ASSERT(cls.is_const()); const Array& fields_array = Array::Handle(cls.fields()); intptr_t len = fields_array.Length(); Field& field = Field::Handle(); for (intptr_t i = 0; i < len; i++) { field ^= fields_array.At(i); if (!field.is_static() && !field.is_final()) { const String& class_name = String::Handle(cls.Name()); const String& field_name = String::Handle(field.name()); const Script& script = Script::Handle(cls.script()); ReportError(Error::Handle(), // No previous error. script, field.token_pos(), "const class '%s' has non-final field '%s'", class_name.ToCString(), field_name.ToCString()); } } } void ClassFinalizer::PrintClassInformation(const Class& cls) { HANDLESCOPE(Isolate::Current()); const String& class_name = String::Handle(cls.Name()); OS::Print("class '%s'", class_name.ToCString()); const Library& library = Library::Handle(cls.library()); if (!library.IsNull()) { OS::Print(" library '%s%s':\n", String::Handle(library.url()).ToCString(), String::Handle(library.private_key()).ToCString()); } else { OS::Print(" (null library):\n"); } const AbstractType& super_type = AbstractType::Handle(cls.super_type()); if (super_type.IsNull()) { OS::Print(" Super: NULL"); } else { const String& super_name = String::Handle(super_type.Name()); OS::Print(" Super: %s", super_name.ToCString()); } const Array& interfaces_array = Array::Handle(cls.interfaces()); if (interfaces_array.Length() > 0) { OS::Print("; interfaces: "); AbstractType& interface = AbstractType::Handle(); intptr_t len = interfaces_array.Length(); for (intptr_t i = 0; i < len; i++) { interface ^= interfaces_array.At(i); OS::Print(" %s ", interface.ToCString()); } } OS::Print("\n"); const Array& functions_array = Array::Handle(cls.functions()); Function& function = Function::Handle(); intptr_t len = functions_array.Length(); for (intptr_t i = 0; i < len; i++) { function ^= functions_array.At(i); OS::Print(" %s\n", function.ToCString()); } const Array& fields_array = Array::Handle(cls.fields()); Field& field = Field::Handle(); len = fields_array.Length(); for (intptr_t i = 0; i < len; i++) { field ^= fields_array.At(i); OS::Print(" %s\n", field.ToCString()); } } // Either report an error or mark the type as malformed. void ClassFinalizer::ReportMalformedType(const Error& prev_error, const Class& cls, const Type& type, const char* format, va_list args) { LanguageError& error = LanguageError::Handle(); const Script& script = Script::Handle(cls.script()); if (prev_error.IsNull()) { error ^= Parser::FormatError( script, type.token_pos(), "Error", format, args); } else { error ^= Parser::FormatErrorWithAppend( prev_error, script, type.token_pos(), "Error", format, args); } if (FLAG_error_on_bad_type) { ReportError(error); } type.set_malformed_error(error); // Make the type raw, since it may not be possible to // properly finalize its type arguments. type.set_type_class(Class::Handle(Object::dynamic_class())); type.set_arguments(Object::null_abstract_type_arguments()); if (!type.IsFinalized()) { type.SetIsFinalized(); // Do not canonicalize malformed types, since they may not be resolved. } else { // The only case where the malformed type was already finalized is when its // type arguments are not within bounds. In that case, we have a prev_error. ASSERT(!prev_error.IsNull()); } } RawType* ClassFinalizer::NewFinalizedMalformedType(const Error& prev_error, const Class& cls, intptr_t type_pos, const char* format, ...) { va_list args; va_start(args, format); const UnresolvedClass& unresolved_class = UnresolvedClass::Handle( UnresolvedClass::New(LibraryPrefix::Handle(), Symbols::Empty(), type_pos)); const Type& type = Type::Handle( Type::New(unresolved_class, TypeArguments::Handle(), type_pos)); ReportMalformedType(prev_error, cls, type, format, args); va_end(args); ASSERT(type.IsMalformed()); ASSERT(type.IsFinalized()); return type.raw(); } void ClassFinalizer::FinalizeMalformedType(const Error& prev_error, const Class& cls, const Type& type, const char* format, ...) { va_list args; va_start(args, format); ReportMalformedType(prev_error, cls, type, format, args); va_end(args); } void ClassFinalizer::ReportError(const Error& error) { Isolate::Current()->long_jump_base()->Jump(1, error); UNREACHABLE(); } void ClassFinalizer::ReportError(const Error& prev_error, const Script& script, intptr_t token_pos, const char* format, ...) { va_list args; va_start(args, format); Error& error = Error::Handle(); if (prev_error.IsNull()) { error ^= Parser::FormatError(script, token_pos, "Error", format, args); } else { error ^= Parser::FormatErrorWithAppend( prev_error, script, token_pos, "Error", format, args); } va_end(args); ReportError(error); } void ClassFinalizer::ReportError(const char* format, ...) { va_list args; va_start(args, format); const Error& error = Error::Handle( Parser::FormatError(Script::Handle(), -1, "Error", format, args)); va_end(args); ReportError(error); } void ClassFinalizer::VerifyImplicitFieldOffsets() { #ifdef DEBUG Isolate* isolate = Isolate::Current(); const ClassTable& class_table = *(isolate->class_table()); Class& cls = Class::Handle(isolate); Array& fields_array = Array::Handle(isolate); Field& field = Field::Handle(isolate); String& name = String::Handle(isolate); String& expected_name = String::Handle(isolate); Error& error = Error::Handle(isolate); // First verify field offsets of all the TypedDataView classes. for (intptr_t cid = kTypedDataInt8ArrayViewCid; cid <= kTypedDataFloat32x4ArrayViewCid; cid++) { cls = class_table.At(cid); // Get the TypedDataView class. error = cls.EnsureIsFinalized(isolate); ASSERT(error.IsNull()); cls = cls.SuperClass(); // Get it's super class '_TypedListView'. fields_array ^= cls.fields(); ASSERT(fields_array.Length() == TypedDataView::NumberOfFields()); field ^= fields_array.At(0); ASSERT(field.Offset() == TypedDataView::data_offset()); name ^= field.name(); expected_name ^= String::New("_typedData"); ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name)); field ^= fields_array.At(1); ASSERT(field.Offset() == TypedDataView::offset_in_bytes_offset()); name ^= field.name(); ASSERT(name.Equals("offsetInBytes")); field ^= fields_array.At(2); ASSERT(field.Offset() == TypedDataView::length_offset()); name ^= field.name(); ASSERT(name.Equals("length")); } // Now verify field offsets of '_ByteDataView' class. cls = class_table.At(kByteDataViewCid); error = cls.EnsureIsFinalized(isolate); ASSERT(error.IsNull()); fields_array ^= cls.fields(); ASSERT(fields_array.Length() == TypedDataView::NumberOfFields()); field ^= fields_array.At(0); ASSERT(field.Offset() == TypedDataView::data_offset()); name ^= field.name(); expected_name ^= String::New("_typedData"); ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name)); field ^= fields_array.At(1); ASSERT(field.Offset() == TypedDataView::offset_in_bytes_offset()); name ^= field.name(); expected_name ^= String::New("_offset"); ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name)); field ^= fields_array.At(2); ASSERT(field.Offset() == TypedDataView::length_offset()); name ^= field.name(); ASSERT(name.Equals("length")); #endif } } // namespace dart