private static bool AssertSingleGlobalType( IReadOnlyList <IType> types, LNode nameNode, DecoderState state) { if (types.Count == 1) { return(true); } if (types.Count == 0) { FeedbackHelpers.LogSyntaxError( state.Log, nameNode, FeedbackHelpers.QuoteEven( "there is no type named ", FeedbackHelpers.Print(nameNode), ".")); } else { FeedbackHelpers.LogSyntaxError( state.Log, nameNode, FeedbackHelpers.QuoteEven( "there is more than one type named ", FeedbackHelpers.Print(nameNode), ".")); } return(false); }
/// <summary> /// Decodes an LNode as a reference to a generic member. /// Logs an error if the decoding process fails. /// </summary> /// <param name="node">A node to decode as a generic member.</param> /// <param name="genericMember">The generic member described by <paramref name="node"/>.</param> /// <returns> /// <c>true</c> if <paramref name="node"/> can be decoded as a /// generic member; otherwise, <c>false</c>. /// </returns> public bool AssertDecodeGenericMember( LNode node, out IGenericMember genericMember) { if (node.Calls(EncoderState.typeHintSymbol)) { if (!FeedbackHelpers.AssertArgCount(node, 1, Log)) { genericMember = null; return(false); } else { var type = DecodeType(node.Args[0]); genericMember = type; return(!(type == null || type is ErrorType)); } } else if (node.Calls(EncoderState.methodHintSymbol)) { if (!FeedbackHelpers.AssertArgCount(node, 1, Log)) { genericMember = null; return(false); } else { var method = DecodeMethod(node.Args[0]); genericMember = method; return(method != null); } } else { FeedbackHelpers.LogSyntaxError( Log, node, FeedbackHelpers.QuoteEven( "unknown kind of generic member; " + "generic member kinds must be hinted using either ", EncoderState.methodHintSymbol.ToString(), " or ", EncoderState.typeHintSymbol.ToString(), " nodes.")); genericMember = null; return(false); } }
private static bool AssertSingleChildType( IReadOnlyList <IType> types, LNode parentAndNameNode, DecoderState state, string parentKindDescription) { if (types.Count == 1) { return(true); } var parentNode = parentAndNameNode.Args[0]; var nameNode = parentAndNameNode.Args[1]; if (types.Count == 0) { FeedbackHelpers.LogSyntaxError( state.Log, nameNode, FeedbackHelpers.QuoteEven( parentKindDescription + " ", FeedbackHelpers.Print(parentNode), " does not define a type named ", FeedbackHelpers.Print(nameNode), ".")); } else { FeedbackHelpers.LogSyntaxError( state.Log, nameNode, FeedbackHelpers.QuoteEven( parentKindDescription + " ", FeedbackHelpers.Print(parentNode), " defines more than one type named ", FeedbackHelpers.Print(nameNode), ".")); } return(false); }
/// <summary> /// Decodes an LNode as a simple name. Logs an error if the decoding /// process fails. /// </summary> /// <param name="node">A node to decode as a simple name.</param> /// <param name="name">The name described by <paramref name="node"/>.</param> /// <returns> /// <c>true</c> if <paramref name="node"/> can be decoded as a simple /// name; otherwise, <c>false</c>. /// </returns> public bool AssertDecodeSimpleName(LNode node, out SimpleName name) { if (node.IsId) { name = new SimpleName(node.Name.Name); return(true); } else if (node.IsCall) { var nameNode = node.Target; int arity; if (!FeedbackHelpers.AssertIsId(nameNode, Log) || !FeedbackHelpers.AssertArgCount(node, 1, Log) || !AssertDecodeInt32(node.Args[0], out arity)) { name = null; return(false); } name = new SimpleName(nameNode.Name.Name, arity); return(true); } else { FeedbackHelpers.LogSyntaxError( Log, node, FeedbackHelpers.QuoteEven( "expected a simple name, which can either be a simple id (e.g., ", "Name", ") or a call to an id that specifies the number of generic parameters (e.g., ", "Name(2)", ").")); name = null; return(false); } }
/// <inheritdoc/> public override IType Decode(LNode data, DecoderState state) { if (data.Calls(pointerSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } var elemType = state.DecodeType(data.Args[0]); PointerKind kind; if (AssertDecodePointerKind(data.Args[1], state, out kind)) { return(elemType.MakePointerType(kind)); } else { return(ErrorType.Instance); } } else if (data.Calls(genericParameterSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } IGenericMember parent; SimpleName name; if (state.AssertDecodeGenericMember(data.Args[0], out parent) && state.AssertDecodeSimpleName(data.Args[1], out name)) { var types = state.TypeResolver.ResolveGenericParameters(parent, name); if (AssertSingleChildType(types, data, state, "generic declaration")) { return(types[0]); } } return(ErrorType.Instance); } else if (data.Calls(CodeSymbols.Of)) { if (!FeedbackHelpers.AssertMinArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } var genericDecl = state.DecodeType(data.Args[0]); var genericArgs = data.Args.Slice(1).EagerSelect <LNode, IType>(state.DecodeType); int count = genericDecl.GenericParameters.Count; if (count != genericArgs.Count) { FeedbackHelpers.LogSyntaxError( state.Log, data, FeedbackHelpers.QuoteEven( "type ", FeedbackHelpers.Print(data.Args[0]), " is instantiated with ", genericArgs.Count.ToString(), " arguments but has only ", count.ToString(), " parameters.")); return(ErrorType.Instance); } return(genericDecl.MakeGenericType(genericArgs)); } else if (data.Calls(CodeSymbols.Dot)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } SimpleName childName; if (!state.AssertDecodeSimpleName(data.Args[1], out childName)) { return(ErrorType.Instance); } var parentType = state.DecodeType(data.Args[0]); if (parentType == ErrorType.Instance) { // Make sure that we don't log an additional error // just because the parent type was wrong. return(ErrorType.Instance); } var childTypes = state.TypeResolver.ResolveNestedTypes(parentType, childName); if (AssertSingleChildType(childTypes, data, state, "type")) { return(childTypes[0]); } else { return(ErrorType.Instance); } } else { QualifiedName fullName; if (state.AssertDecodeQualifiedName(data, out fullName)) { var types = state.TypeResolver.ResolveTypes(fullName); if (AssertSingleGlobalType(types, data, state)) { return(types[0]); } else { return(ErrorType.Instance); } } else { return(ErrorType.Instance); } } }
private BlockFlow DecodeBlockFlow( LNode node, FlowGraphBuilder graph, Dictionary <Symbol, BasicBlockBuilder> blocks, Dictionary <Symbol, ValueTag> valueTags) { if (node.Calls(CodeSymbols.Goto)) { Branch target; if (FeedbackHelpers.AssertArgCount(node, 1, Log) && AssertDecodeBranch(node.Args[0], graph, blocks, valueTags, out target)) { return(new JumpFlow(target)); } else { return(UnreachableFlow.Instance); } } else if (node.Calls(CodeSymbols.Switch)) { // Decode the value being switched on as well as the default branch. Instruction switchVal; Branch defaultTarget; if (FeedbackHelpers.AssertArgCount(node, 3, Log) && AssertDecodeInstruction(node.Args[0], valueTags, out switchVal) && AssertDecodeBranch(node.Args[1], graph, blocks, valueTags, out defaultTarget)) { // Decode the switch cases. var switchCases = ImmutableList.CreateBuilder <SwitchCase>(); foreach (var caseNode in node.Args[2].Args) { if (!FeedbackHelpers.AssertArgCount(caseNode, 2, Log) || !FeedbackHelpers.AssertIsCall(caseNode.Args[0], Log)) { continue; } var constants = ImmutableHashSet.CreateRange <Constant>( caseNode.Args[0].Args .Select(DecodeConstant) .Where(x => x != null)); Branch caseTarget; if (AssertDecodeBranch(caseNode.Args[1], graph, blocks, valueTags, out caseTarget)) { switchCases.Add(new SwitchCase(constants, caseTarget)); } } return(new SwitchFlow(switchVal, switchCases.ToImmutable(), defaultTarget)); } else { return(UnreachableFlow.Instance); } } else if (node.Calls(CodeSymbols.Return)) { Instruction retValue; if (FeedbackHelpers.AssertArgCount(node, 1, Log) && AssertDecodeInstruction(node.Args[0], valueTags, out retValue)) { return(new ReturnFlow(retValue)); } else { return(UnreachableFlow.Instance); } } else if (node.Calls(CodeSymbols.Try)) { Instruction tryValue; Branch successBranch; Branch exceptionBranch; if (FeedbackHelpers.AssertArgCount(node, 3, Log) && AssertDecodeInstruction(node.Args[0], valueTags, out tryValue) && AssertDecodeBranch(node.Args[1], graph, blocks, valueTags, out successBranch) && AssertDecodeBranch(node.Args[2], graph, blocks, valueTags, out exceptionBranch)) { return(new TryFlow(tryValue, successBranch, exceptionBranch)); } else { return(UnreachableFlow.Instance); } } else if (node.IsIdNamed(EncoderState.unreachableFlowSymbol)) { return(UnreachableFlow.Instance); } else { FeedbackHelpers.LogSyntaxError( Log, node, Quotation.QuoteEvenInBold( "unknown type of flow; expected one of ", CodeSymbols.Goto.Name, ", ", CodeSymbols.Switch.Name, ", ", CodeSymbols.Try.Name, ", ", CodeSymbols.Return.Name, " or ", EncoderState.unreachableFlowSymbol.Name, ".")); return(UnreachableFlow.Instance); } }
/// <summary> /// Decodes an LNode as a constant value. /// </summary> /// <param name="node">The node to decode.</param> /// <param name="state">The decoder state to use.</param> /// <returns>A decoded constant.</returns> public override Constant Decode(LNode node, DecoderState state) { // Default-value constants. if (node.IsIdNamed(CodeSymbols.Default)) { return(DefaultConstant.Instance); } // Type/field/method token constants. if (node.Calls(CodeSymbols.Typeof, 1)) { return(new TypeTokenConstant(state.DecodeType(node.Args[0]))); } else if (node.Calls(fieldofSymbol, 1)) { return(new FieldTokenConstant(state.DecodeField(node.Args[0]))); } else if (node.Calls(methodofSymbol, 1)) { return(new MethodTokenConstant(state.DecodeMethod(node.Args[0]))); } if (!FeedbackHelpers.AssertIsLiteral(node, state.Log)) { return(null); } object value; Symbol typeMarker; // Custom literals. if (TryDecomposeCustomLiteral(node, out value, out typeMarker)) { // Arbitrary-width integer literals. IntegerSpec spec; if (IntegerSpec.TryParse(typeMarker.Name, out spec)) { BigInteger integerVal; if (BigInteger.TryParse(value.ToString(), out integerVal)) { return(new IntegerConstant(integerVal, spec)); } else { FeedbackHelpers.LogSyntaxError( state.Log, node, FeedbackHelpers.QuoteEven( "cannot parse ", value.ToString(), " as an integer.")); return(null); } } else { FeedbackHelpers.LogSyntaxError( state.Log, node, FeedbackHelpers.QuoteEven( "unknown custom literal type ", typeMarker.Name, ".")); return(null); } } value = node.Value; // Miscellaneous constants: null, strings, Booleans. if (value == null) { return(NullConstant.Instance); } else if (value is string) { return(new StringConstant((string)value)); } else if (value is bool) { return(BooleanConstant.Create((bool)value)); } // Floating-point numbers. else if (value is float) { return(new Float32Constant((float)value)); } else if (value is double) { return(new Float64Constant((double)value)); } // Fixed-width integer constants and characters. else if (value is char) { return(new IntegerConstant((char)value)); } else if (value is sbyte) { return(new IntegerConstant((sbyte)value)); } else if (value is short) { return(new IntegerConstant((short)value)); } else if (value is int) { return(new IntegerConstant((int)value)); } else if (value is long) { return(new IntegerConstant((long)value)); } else if (value is byte) { return(new IntegerConstant((byte)value)); } else if (value is ushort) { return(new IntegerConstant((ushort)value)); } else if (value is uint) { return(new IntegerConstant((uint)value)); } else if (value is ulong) { return(new IntegerConstant((ulong)value)); } FeedbackHelpers.LogSyntaxError( state.Log, node, new Text("unknown literal type.")); return(null); }
/// <inheritdoc/> public override ITypeMember Decode(LNode data, DecoderState state) { if (data.Calls(accessorSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log) || !FeedbackHelpers.AssertIsId(data.Args[1], state.Log)) { return(null); } var property = state.DecodeProperty(data.Args[0]); if (property == null) { return(null); } else { var kindName = data.Args[1].Name.Name; var accessor = property.Accessors.FirstOrDefault( acc => accessorKindEncodings[acc.Kind] == kindName); if (accessor == null) { FeedbackHelpers.LogSyntaxError( state.Log, data.Args[1], Quotation.QuoteEvenInBold( "property ", FeedbackHelpers.Print(data.Args[0]), " does not define a ", kindName, " accessor.")); } return(accessor); } } else if (data.Calls(CodeSymbols.Dot)) { // Simple dot indicates a field. IType parentType; SimpleName name; if (!AssertDecodeTypeAndName(data, state, out parentType, out name)) { return(null); } var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IField>() .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0], data.Args[1], "field", state)); } else if (data.CallsMin(CodeSymbols.IndexBracks, 1)) { IType parentType; SimpleName name; if (!AssertDecodeTypeAndName(data.Args[0], state, out parentType, out name)) { return(null); } var indexTypes = data.Args .Slice(1) .EagerSelect(state.DecodeType); var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IProperty>() .Where(prop => prop.IndexerParameters .Select(p => p.Type) .SequenceEqual(indexTypes)) .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0].Args[0], data, "property", state)); } else if (data.Calls(CodeSymbols.Lambda)) { IType parentType; SimpleName name; if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log) || !FeedbackHelpers.AssertIsCall(data.Args[0], state.Log) || !AssertDecodeTypeAndName(data.Args[0].Target, state, out parentType, out name)) { return(null); } // TODO: implement generic parameter decoding, use generic // parameters in resolution process. var paramTypes = data.Args[0].Args .EagerSelect(state.DecodeType); var retType = state.DecodeType(data.Args[1]); var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IMethod>() .Where(method => method.Parameters .Select(p => p.Type) .SequenceEqual(paramTypes) && object.Equals( method.ReturnParameter.Type, retType)) .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0].Target.Args[0], data, "method", state)); } else if (data.Calls(CodeSymbols.Of)) { if (!FeedbackHelpers.AssertMinArgCount(data, 1, state.Log)) { return(null); } var func = state.DecodeMethod(data.Args[0]); var args = data.Args.Slice(1).EagerSelect(state.DecodeType); if (func.GenericParameters.Count == args.Count) { return(func.MakeGenericMethod(args)); } else { state.Log.LogSyntaxError( data, Quotation.QuoteEvenInBold( "generic arity mismatch; expected ", func.GenericParameters.Count.ToString(), " parameters but got ", args.Count.ToString(), ".")); return(null); } } else { state.Log.LogSyntaxError( data, Quotation.QuoteEvenInBold( "cannot interpret ", FeedbackHelpers.Print(data), " as a type member; expected a call to one of ", accessorSymbol.Name, ", ", CodeSymbols.Dot.Name, ", ", CodeSymbols.IndexBracks.Name, ", ", CodeSymbols.Of.Name, " or ", CodeSymbols.Lambda.Name)); return(null); } }