/// <summary> /// Creates CIL prototype exception specification rules. /// </summary> /// <param name="corlibTypeResolver"> /// A type resolver for the core library (corlib.dll) that /// defines well-known exception types. /// </param> /// <returns>Prototype exception specification rules.</returns> public static RuleBasedPrototypeExceptionSpecs Create( ReadOnlyTypeResolver corlibTypeResolver) { var result = new RuleBasedPrototypeExceptionSpecs( RuleBasedPrototypeExceptionSpecs.Default); // We know the type of exception thrown by null checks: // it's System.NullReferenceException. var nullRefException = corlibTypeResolver.ResolveTypes( new SimpleName(nameof(NullReferenceException)) .Qualify(nameof(System))) .Single(); // Resolve other well-known exception types. var outOfRangeException = corlibTypeResolver.ResolveTypes( new SimpleName(nameof(IndexOutOfRangeException)) .Qualify(nameof(System))) .Single(); var arrayTypeMismatchException = corlibTypeResolver.ResolveTypes( new SimpleName(nameof(ArrayTypeMismatchException)) .Qualify(nameof(System))) .Single(); // Refine null check exception types. result.Register <GetFieldPointerPrototype>( new NullCheckExceptionSpecification(0, nullRefException)); result.Register <NewDelegatePrototype>( proto => proto.Lookup == MethodLookup.Virtual ? new NullCheckExceptionSpecification(0, nullRefException) : ExceptionSpecification.NoThrow); result.Register <UnboxPrototype>( new NullCheckExceptionSpecification(0, nullRefException)); // Array intrinsics are worth refining, too. result.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.GetElementPointer), ExceptionSpecification.Union( new NullCheckExceptionSpecification(0, nullRefException), ExceptionSpecification.Exactly(outOfRangeException), ExceptionSpecification.Exactly(arrayTypeMismatchException))); result.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.LoadElement), ExceptionSpecification.Union( new NullCheckExceptionSpecification(0, nullRefException), ExceptionSpecification.Exactly(outOfRangeException))); result.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.StoreElement), ExceptionSpecification.Union( new NullCheckExceptionSpecification(0, nullRefException), ExceptionSpecification.Exactly(outOfRangeException), ExceptionSpecification.Exactly(arrayTypeMismatchException))); result.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.GetLength), new NullCheckExceptionSpecification(0, nullRefException)); return(result); }
/// <summary> /// Creates a null-check exception specification. /// </summary> /// <param name="parameterIndex"> /// The index of the instruction parameter that is null checked. /// </param> /// <param name="exceptionType"> /// The type of exception that is thrown if and when /// a null check fails. /// </param> public NullCheckExceptionSpecification( int parameterIndex, IType exceptionType) : this(parameterIndex, ExceptionSpecification.Exactly(exceptionType)) { }
static RuleBasedPrototypeExceptionSpecs() { Default = new RuleBasedPrototypeExceptionSpecs(); // Instruction prototypes that never throw. Default.Register <AllocaArrayPrototype>(ExceptionSpecification.NoThrow); Default.Register <AllocaPrototype>(ExceptionSpecification.NoThrow); Default.Register <BoxPrototype>(ExceptionSpecification.NoThrow); Default.Register <ConstantPrototype>(ExceptionSpecification.NoThrow); Default.Register <CopyPrototype>(ExceptionSpecification.NoThrow); Default.Register <DynamicCastPrototype>(ExceptionSpecification.NoThrow); Default.Register <GetStaticFieldPointerPrototype>(ExceptionSpecification.NoThrow); Default.Register <LoadPrototype>(ExceptionSpecification.NoThrow); Default.Register <ReinterpretCastPrototype>(ExceptionSpecification.NoThrow); Default.Register <StorePrototype>(ExceptionSpecification.NoThrow); // Instruction prototypes that may throw because of implicit null checks. Default.Register <GetFieldPointerPrototype>( new NullCheckExceptionSpecification(0, ExceptionSpecification.ThrowAny)); Default.Register <NewDelegatePrototype>( proto => proto.Lookup == MethodLookup.Virtual ? new NullCheckExceptionSpecification(0, ExceptionSpecification.ThrowAny) : ExceptionSpecification.NoThrow); Default.Register <UnboxPrototype>( new NullCheckExceptionSpecification(0, ExceptionSpecification.ThrowAny)); // Call-like instruction prototypes. // TODO: use the callee's exception specification. Default.Register <CallPrototype>(ExceptionSpecification.ThrowAny); Default.Register <NewObjectPrototype>(ExceptionSpecification.ThrowAny); Default.Register <IndirectCallPrototype>(ExceptionSpecification.ThrowAny); // Arithmetic intrinsics never throw. foreach (var name in ArithmeticIntrinsics.Operators.All) { Default.Register( ArithmeticIntrinsics.GetArithmeticIntrinsicName(name), ExceptionSpecification.NoThrow); } // Array intrinsics are a little more complicated. // TODO: model bounds checks somehow. Default.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.GetElementPointer), ExceptionSpecification.ThrowAny); Default.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.LoadElement), ExceptionSpecification.ThrowAny); Default.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.StoreElement), ExceptionSpecification.ThrowAny); Default.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.GetLength), new NullCheckExceptionSpecification(0, ExceptionSpecification.ThrowAny)); Default.Register( ArrayIntrinsics.Namespace.GetIntrinsicName(ArrayIntrinsics.Operators.NewArray), ExceptionSpecification.NoThrow); // Exception intrinsics. Default.Register( ExceptionIntrinsics.Namespace.GetIntrinsicName(ExceptionIntrinsics.Operators.Capture), ExceptionSpecification.NoThrow); Default.Register( ExceptionIntrinsics.Namespace.GetIntrinsicName(ExceptionIntrinsics.Operators.GetCapturedException), ExceptionSpecification.NoThrow); Default.Register( ExceptionIntrinsics.Namespace.GetIntrinsicName(ExceptionIntrinsics.Operators.Rethrow), ExceptionSpecification.ThrowAny); Default.Register( ExceptionIntrinsics.Namespace.GetIntrinsicName(ExceptionIntrinsics.Operators.Throw), proto => ExceptionSpecification.Exactly(proto.ParameterTypes[0])); // Object intrinsics. // TODO: model exception thrown by type check. Default.Register( ObjectIntrinsics.Namespace.GetIntrinsicName(ObjectIntrinsics.Operators.UnboxAny), ExceptionSpecification.ThrowAny); }