Michael Schimmel
529 lines
21 KiB
ObjectPascal
529 lines
21 KiB
ObjectPascal
unit Myc.Ast.TypeChecker;
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interface
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uses
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System.SysUtils,
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System.Classes,
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System.Generics.Collections,
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Myc.Data.Scalar,
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Myc.Data.Value,
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Myc.Ast.Nodes,
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Myc.Ast.Visitor,
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Myc.Ast.Scope,
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Myc.Ast.Types,
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Myc.Ast,
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Myc.Ast.Binding.Nodes;
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type
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IAstTypeChecker = interface(IAstVisitor)
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function Execute(const RootNode: IAstNode; const ADecriptor: IScopeDescriptor): IAstNode;
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end;
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// This transformer runs *after* the TAstBinder.
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// It takes the "Bound AST" (which has addresses but mostly TTypes.Unknown)
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// and traverses it bottom-up to infer and check all static types.
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// It modifies the node.StaticType property and updates the IScopeDescriptor.
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TTypeChecker = class(TAstTransformer, IAstTypeChecker)
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private
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FCurrentDescriptor: IScopeDescriptor;
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function SetType(const NodeData: TDataValue; const AType: IStaticType): TDataValue; overload;
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protected
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// Override all visit methods to perform type checking
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function VisitIdentifier(const Node: IIdentifierNode): TDataValue; override;
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function VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue; override;
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function VisitAssignment(const Node: IAssignmentNode): TDataValue; override;
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function VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue; override;
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function VisitFunctionCall(const Node: IFunctionCallNode): TDataValue; override;
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function VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue; override;
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function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
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function VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue; override;
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function VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue; override;
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function VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue; override;
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function VisitMemberAccess(const Node: IMemberAccessNode): TDataValue; override;
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function VisitIndexer(const Node: IIndexerNode): TDataValue; override;
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function VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue; override;
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function VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue; override;
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function VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue; override;
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function VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue; override;
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function VisitRecurNode(const Node: IRecurNode): TDataValue; override;
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// Base cases (types are already known from binder)
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function VisitConstant(const Node: IConstantNode): TDataValue; override;
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function VisitKeyword(const Node: IKeywordNode): TDataValue; override;
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// Compile-time nodes (should not be present)
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function VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue; override;
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function VisitMacroDefinition(const Node: IMacroDefinitionNode): TDataValue; override;
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public
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constructor Create(const ADescriptor: IScopeDescriptor);
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function Execute(const RootNode: IAstNode; const ADescriptor: IScopeDescriptor): IAstNode;
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class function CheckTypes(const RootNode: IAstNode; const ADescriptor: IScopeDescriptor): IAstNode; static;
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end;
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implementation
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uses
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System.Generics.Defaults,
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Myc.Data.Keyword;
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{ TTypeChecker }
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constructor TTypeChecker.Create(const ADescriptor: IScopeDescriptor);
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begin
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inherited Create;
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Assert(Assigned(ADescriptor));
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FCurrentDescriptor := ADescriptor;
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end;
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class function TTypeChecker.CheckTypes(const RootNode: IAstNode; const ADescriptor: IScopeDescriptor): IAstNode;
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begin
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var checker := TTypeChecker.Create(ADescriptor) as IAstTypeChecker;
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Result := checker.Execute(RootNode, ADescriptor);
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end;
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function TTypeChecker.Execute(const RootNode: IAstNode; const ADescriptor: IScopeDescriptor): IAstNode;
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begin
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FCurrentDescriptor := ADescriptor;
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var transformedValue := Accept(RootNode);
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if transformedValue.IsVoid then
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Result := TAst.Block([])
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else
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Result := transformedValue.AsIntf<IAstNode>;
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(Result as TAstNode).StaticType := (Result as TAstNode).StaticType;
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end;
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function TTypeChecker.SetType(const NodeData: TDataValue; const AType: IStaticType): TDataValue;
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begin
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if (not NodeData.IsVoid) and (NodeData.Kind = vkInterface) then
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(NodeData.AsIntf<IAstNode> as TAstNode).StaticType := AType;
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Result := NodeData;
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end;
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function TTypeChecker.VisitConstant(const Node: IConstantNode): TDataValue;
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begin
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// Type was set by Binder, just propagate it up.
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Result := TDataValue.FromIntf<IConstantNode>(Node);
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end;
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function TTypeChecker.VisitKeyword(const Node: IKeywordNode): TDataValue;
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begin
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// Type was set by Binder, just propagate it up.
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Result := TDataValue.FromIntf<IKeywordNode>(Node);
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end;
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function TTypeChecker.VisitIdentifier(const Node: IIdentifierNode): TDataValue;
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begin
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// Type was set by Binder (read from scope), just propagate it up.
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Result := TDataValue.FromIntf<IIdentifierNode>(Node);
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end;
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function TTypeChecker.VisitRecurNode(const Node: IRecurNode): TDataValue;
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begin
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// Type was set by Binder (TTypes.Void), just propagate it up.
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Result := TDataValue.FromIntf<IRecurNode>(Node);
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end;
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function TTypeChecker.VisitMacroDefinition(const Node: IMacroDefinitionNode): TDataValue;
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begin
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raise Exception.Create('TTypeChecker: MacroDefinition node encountered.');
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end;
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function TTypeChecker.VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue;
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begin
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raise Exception.Create('TTypeChecker: MacroExpansionNode node encountered.');
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end;
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function TTypeChecker.VisitVariableDeclaration(const Node: IVariableDeclarationNode): TDataValue;
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var
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initNode: IAstNode;
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initType: IStaticType;
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boundIdent: TBoundIdentifierNode;
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adr: TResolvedAddress;
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begin
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// 1. Visit the initializer (if it exists) to get its (now-inferred) type.
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if Assigned(Node.Initializer) then
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begin
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initNode := Accept(Node.Initializer).AsIntf<IAstNode>;
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initType := (initNode as TAstNode).StaticType;
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end
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else
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initType := TTypes.Void;
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// 2. Get the address from the bound identifier.
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boundIdent := (Node.Identifier as TBoundIdentifierNode);
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adr := boundIdent.Address;
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// 3. Update the type in the scope descriptor (which was set to Unknown by the binder).
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FCurrentDescriptor.UpdateType(adr.SlotIndex, initType);
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// 4. Update the static types of the nodes themselves.
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(boundIdent as TAstNode).StaticType := initType;
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Result := SetType(TDataValue.FromIntf(Node), initType);
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end;
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function TTypeChecker.VisitAssignment(const Node: IAssignmentNode): TDataValue;
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var
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boundIdentifier, boundValue: IAstNode;
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targetType, sourceType: IStaticType;
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begin
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boundIdentifier := Accept(Node.Identifier).AsIntf<IAstNode>;
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boundValue := Accept(Node.Value).AsIntf<IAstNode>;
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targetType := (boundIdentifier as TAstNode).StaticType;
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sourceType := (boundValue as TAstNode).StaticType;
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if not TTypeRules.CanAssign(targetType, sourceType) then
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raise ETypeException.CreateFmt('Cannot assign type %s to %s', [sourceType.ToString, targetType.ToString]);
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Result := SetType(TDataValue.FromIntf<IAssignmentNode>(Node), targetType);
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end;
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function TTypeChecker.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
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var
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boundNode: TBoundLambdaExpressionNode;
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boundBody: IAstNode;
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bodyType, methodType: IStaticType;
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paramTypes: TArray<IStaticType>;
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i: Integer;
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begin
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boundNode := (Node as TBoundLambdaExpressionNode);
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// 1. Enter the lambda's scope
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FCurrentDescriptor := boundNode.ScopeDescriptor;
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try
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// 2. Set parameter types (currently Unknown, but required for signature)
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SetLength(paramTypes, Length(boundNode.Parameters));
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for i := 0 to High(boundNode.Parameters) do
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paramTypes[i] := (boundNode.Parameters[i] as TAstNode).StaticType; // Propagates Unknown
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// 3. Visit the body to infer its return type
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boundBody := Accept(boundNode.Body).AsIntf<IAstNode>;
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bodyType := (boundBody as TAstNode).StaticType;
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// 4. Create the final method type
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methodType := TTypes.CreateMethod(paramTypes, bodyType);
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// 5. Update the type for <self> (Slot 0) in the descriptor
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FCurrentDescriptor.UpdateType(0, methodType);
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finally
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// 6. Restore parent descriptor
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FCurrentDescriptor := FCurrentDescriptor.Parent;
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end;
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// 7. Set the type of the lambda node itself
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Result := SetType(TDataValue.FromIntf<ILambdaExpressionNode>(boundNode), methodType);
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end;
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function TTypeChecker.VisitFunctionCall(const Node: IFunctionCallNode): TDataValue;
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var
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callee: IAstNode;
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args: TArray<IAstNode>;
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calleeType, retType: IStaticType;
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i: Integer;
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begin
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// 1. Visit children first (bottom-up)
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callee := Accept(Node.Callee).AsIntf<IAstNode>;
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args := AcceptNodes<IAstNode>(Node.Arguments);
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// 2. Get callee type (now inferred)
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calleeType := (callee as TAstNode).StaticType;
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retType := TTypes.Unknown; // Default if not a method
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// 3. Perform type checking
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if calleeType.Kind = TStaticTypeKind.stMethod then
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begin
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var signature := calleeType.Signature;
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if Length(args) <> Length(signature.ParamTypes) then
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raise ETypeException.CreateFmt('Function expects %d arguments, but got %d', [Length(signature.ParamTypes), Length(args)]);
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retType := signature.ReturnType;
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// Check argument types
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for i := 0 to High(args) do
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begin
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var argType := (args[i] as TAstNode).StaticType;
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var paramType := signature.ParamTypes[i];
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if not TTypeRules.CanAssign(paramType, argType) then
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raise ETypeException
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.CreateFmt('Cannot assign argument %d (type %s) to parameter (type %s)', [i, argType.ToString, paramType.ToString]);
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end;
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end
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else if calleeType.Kind <> TStaticTypeKind.stUnknown then
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raise ETypeException.CreateFmt('Cannot invoke type %s as a function.', [calleeType.ToString]);
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// 4. Set the type for this call node
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Result := SetType(TDataValue.FromIntf<IFunctionCallNode>(Node), retType);
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end;
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function TTypeChecker.VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue;
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var
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blockType: IStaticType;
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exprs: TArray<IAstNode>;
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begin
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exprs := AcceptNodes<IAstNode>(Node.Expressions);
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if Length(exprs) > 0 then
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blockType := (exprs[High(exprs)] as TAstNode).StaticType
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else
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blockType := TTypes.Void;
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Result := SetType(TDataValue.FromIntf<IBlockExpressionNode>(Node), blockType);
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end;
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function TTypeChecker.VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
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var
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condition, thenBranch, elseBranch: IAstNode;
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conditionType, thenType, elseType, resultType: IStaticType;
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begin
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condition := Accept(Node.Condition).AsIntf<IAstNode>;
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thenBranch := Accept(Node.ThenBranch).AsIntf<IAstNode>;
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elseBranch := Accept(Node.ElseBranch).AsIntf<IAstNode>; // Accept(nil) returns void
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conditionType := (condition as TAstNode).StaticType;
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if (conditionType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, conditionType) then
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raise ETypeException.CreateFmt('If condition must be Ordinal, but got %s', [conditionType.ToString]);
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thenType := (thenBranch as TAstNode).StaticType;
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elseType :=
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if elseBranch <> nil then (elseBranch as TAstNode).StaticType
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else TTypes.Void;
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resultType := TTypeRules.Promote(thenType, elseType);
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Result := SetType(TDataValue.FromIntf<IIfExpressionNode>(Node), resultType);
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end;
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function TTypeChecker.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
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var
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condition, thenBranch, elseBranch: IAstNode;
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conditionType, thenType, elseType, resultType: IStaticType;
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begin
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condition := Accept(Node.Condition).AsIntf<IAstNode>;
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thenBranch := Accept(Node.ThenBranch).AsIntf<IAstNode>;
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elseBranch := Accept(Node.ElseBranch).AsIntf<IAstNode>;
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conditionType := (condition as TAstNode).StaticType;
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if (conditionType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, conditionType) then
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raise ETypeException.CreateFmt('Ternary condition must be Ordinal, but got %s', [conditionType.ToString]);
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thenType := (thenBranch as TAstNode).StaticType;
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elseType := (elseBranch as TAstNode).StaticType;
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resultType := TTypeRules.Promote(thenType, elseType);
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Result := SetType(TDataValue.FromIntf<ITernaryExpressionNode>(Node), resultType);
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end;
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function TTypeChecker.VisitBinaryExpression(const Node: IBinaryExpressionNode): TDataValue;
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var
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left, right: IAstNode;
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leftType, rightType, resultType: IStaticType;
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begin
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left := Accept(Node.Left).AsIntf<IAstNode>;
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right := Accept(Node.Right).AsIntf<IAstNode>;
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leftType := (left as TAstNode).StaticType;
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rightType := (right as TAstNode).StaticType;
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resultType := TTypeRules.ResolveBinaryOp(Node.Operator, leftType, rightType);
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Result := SetType(TDataValue.FromIntf<IBinaryExpressionNode>(Node), resultType);
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end;
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function TTypeChecker.VisitUnaryExpression(const Node: IUnaryExpressionNode): TDataValue;
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var
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right: IAstNode;
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rightType, resultType: IStaticType;
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begin
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right := Accept(Node.Right).AsIntf<IAstNode>;
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rightType := (right as TAstNode).StaticType;
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resultType := TTypeRules.ResolveUnaryOp(Node.Operator, rightType);
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Result := SetType(TDataValue.FromIntf<IUnaryExpressionNode>(Node), resultType);
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end;
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function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): TDataValue;
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var
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baseNode: IAstNode;
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baseType, elemType: IStaticType;
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fieldIndex: Integer;
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begin
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baseNode := Accept(Node.Base).AsIntf<IAstNode>;
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baseType := (baseNode as TAstNode).StaticType;
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elemType := TTypes.Unknown;
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if (baseType.Kind <> TStaticTypeKind.stUnknown) then
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begin
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if (baseType.Kind = TStaticTypeKind.stRecord) or (baseType.Kind = TStaticTypeKind.stRecordSeries) then
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begin
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fieldIndex := baseType.Definition.IndexOf(Node.Member.Value);
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if fieldIndex < 0 then
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raise ETypeException.CreateFmt('Member "%s" not found in type %s', [Node.Member.Value.Name, baseType.ToString]);
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var fieldType := TTypes.FromScalarKind(baseType.Definition.Fields[fieldIndex].Value);
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if baseType.Kind = TStaticTypeKind.stRecord then
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elemType := fieldType
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else // stRecordSeries
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elemType := TTypes.CreateSeries(fieldType);
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end
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else if (baseType.Kind = TStaticTypeKind.stGenericRecord) then
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begin
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var genDef := baseType.GenericDefinition;
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fieldIndex := genDef.IndexOf(Node.Member.Value);
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if fieldIndex < 0 then
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raise ETypeException.CreateFmt('Member "%s" not found in type %s', [Node.Member.Value.Name, baseType.ToString]);
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elemType := genDef.Fields[fieldIndex].Value;
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end
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else
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begin
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raise ETypeException.CreateFmt('Member access requires a record type, but got %s', [baseType.ToString]);
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end;
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end;
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Result := SetType(TDataValue.FromIntf<IMemberAccessNode>(Node), elemType);
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end;
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function TTypeChecker.VisitIndexer(const Node: IIndexerNode): TDataValue;
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var
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baseNode, indexNode: IAstNode;
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baseType, indexType, elemType: IStaticType;
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begin
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baseNode := Accept(Node.Base).AsIntf<IAstNode>;
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indexNode := Accept(Node.Index).AsIntf<IAstNode>;
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baseType := (baseNode as TAstNode).StaticType;
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indexType := (indexNode as TAstNode).StaticType;
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elemType := TTypes.Unknown;
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if (baseType.Kind <> TStaticTypeKind.stUnknown) then
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begin
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if (baseType.Kind <> TStaticTypeKind.stSeries) and (baseType.Kind <> TStaticTypeKind.stRecordSeries) then
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raise ETypeException.CreateFmt('Indexer `[]` can only be applied to series types, but got %s', [baseType.ToString]);
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if (indexType.Kind <> stUnknown) and not TTypeRules.CanAssign(TTypes.Ordinal, indexType) then
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raise ETypeException.CreateFmt('Indexer `[]` requires an Ordinal index, but got %s', [indexType.ToString]);
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if baseType.Kind = TStaticTypeKind.stSeries then
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elemType := baseType.ElementType
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else // stRecordSeries
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elemType := TTypes.CreateRecord(baseType.Definition);
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end;
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Result := SetType(TDataValue.FromIntf<IIndexerNode>(Node), elemType);
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end;
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function TTypeChecker.VisitRecordLiteral(const Node: IRecordLiteralNode): TDataValue;
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var
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i: Integer;
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boundFields: TArray<TRecordFieldLiteral>;
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scalarDefFields: TArray<TScalarRecordField>;
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def: IScalarRecordDefinition;
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staticType: IStaticType;
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valNode: IAstNode;
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valType: IStaticType;
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scalarKind: TScalar.TKind;
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allScalar: Boolean;
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begin
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SetLength(boundFields, Length(Node.Fields));
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SetLength(scalarDefFields, Length(Node.Fields));
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allScalar := True;
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// 1. Visit all child nodes first to infer their types
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for i := 0 to High(Node.Fields) do
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begin
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valNode := Accept(Node.Fields[i].Value).AsIntf<IAstNode>;
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valType := (valNode as TAstNode).StaticType;
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boundFields[i] := TRecordFieldLiteral.Create(Node.Fields[i].Key, valNode);
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// 2. Check if this field fits the scalar path
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if (valType.Kind = stOrdinal) then
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scalarKind := TScalar.TKind.Ordinal
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else if (valType.Kind = stFloat) then
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scalarKind := TScalar.TKind.Float
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else if (valType.Kind = stKeyword) then
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scalarKind := TScalar.TKind.Keyword
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else
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begin
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allScalar := False;
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scalarKind := TScalar.TKind.Ordinal; // Dummy
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end;
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if allScalar then
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scalarDefFields[i] := TScalarRecordField.Create(Node.Fields[i].Key.Value, scalarKind);
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end;
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// 3. Create the appropriate record type (Scalar or Generic)
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if allScalar then
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begin
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def := TScalarRecordRegistry.Intern(scalarDefFields);
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staticType := TTypes.CreateRecord(def);
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// We can re-use the TBoundRecordLiteralNode from the binder
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(Node as TBoundRecordLiteralNode).Definition := def;
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end
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else
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begin
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var genDefFields: TArray<TPair<IKeyword, IStaticType>>;
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SetLength(genDefFields, Length(boundFields));
|
|
for i := 0 to High(boundFields) do
|
|
genDefFields[i] := TPair<IKeyword, IStaticType>.Create(boundFields[i].Key.Value, (boundFields[i].Value as TAstNode).StaticType);
|
|
|
|
var genDef := TGenericRecordRegistry.Intern(genDefFields);
|
|
staticType := TTypes.CreateGenericRecord(genDef);
|
|
// Re-use the TBoundGenericRecordLiteralNode from the binder
|
|
(Node as TBoundGenericRecordLiteralNode).Definition := genDef;
|
|
end;
|
|
|
|
Result := SetType(TDataValue.FromIntf<IRecordLiteralNode>(Node), staticType);
|
|
end;
|
|
|
|
function TTypeChecker.VisitCreateSeries(const Node: ICreateSeriesNode): TDataValue;
|
|
begin
|
|
// Type was set by Binder, just propagate it up.
|
|
Result := TDataValue.FromIntf<ICreateSeriesNode>(Node);
|
|
end;
|
|
|
|
function TTypeChecker.VisitAddSeriesItem(const Node: IAddSeriesItemNode): TDataValue;
|
|
var
|
|
seriesNode, valueNode, lookbackNode: IAstNode;
|
|
seriesType, valueType: IStaticType;
|
|
begin
|
|
seriesNode := Accept(Node.Series).AsIntf<IAstNode>;
|
|
valueNode := Accept(Node.Value).AsIntf<IAstNode>;
|
|
lookbackNode := Accept(Node.Lookback).AsIntf<IAstNode>;
|
|
|
|
seriesType := (seriesNode as TAstNode).StaticType;
|
|
valueType := (valueNode as TAstNode).StaticType;
|
|
|
|
if (seriesType.Kind <> stUnknown) then
|
|
begin
|
|
if (seriesType.Kind <> TStaticTypeKind.stSeries) then
|
|
raise ETypeException.CreateFmt('"add" requires a series as its first argument, but got %s', [seriesType.ToString]);
|
|
|
|
if not TTypeRules.CanAssign(seriesType.ElementType, valueType) then
|
|
raise ETypeException
|
|
.CreateFmt('Cannot add item of type %s to series of type %s', [valueType.ToString, seriesType.ElementType.ToString]);
|
|
end;
|
|
|
|
if (lookbackNode <> nil) then
|
|
begin
|
|
var lookbackType := (lookbackNode as TAstNode).StaticType;
|
|
if (lookbackType.Kind <> stUnknown) and not (lookbackType.Kind = TStaticTypeKind.stOrdinal) then
|
|
raise ETypeException.Create('Lookback parameter for "add" must be an ordinal value.');
|
|
end;
|
|
|
|
Result := SetType(TDataValue.FromIntf<IAddSeriesItemNode>(Node), TTypes.Void);
|
|
end;
|
|
|
|
function TTypeChecker.VisitSeriesLength(const Node: ISeriesLengthNode): TDataValue;
|
|
var
|
|
seriesNode: IAstNode;
|
|
seriesType: IStaticType;
|
|
begin
|
|
seriesNode := Accept(Node.Series).AsIntf<IAstNode>;
|
|
seriesType := (seriesNode as TAstNode).StaticType;
|
|
|
|
if (seriesType.Kind <> stUnknown)
|
|
and (seriesType.Kind <> TStaticTypeKind.stSeries)
|
|
and (seriesType.Kind <> TStaticTypeKind.stRecordSeries) then
|
|
raise ETypeException.CreateFmt('"length" requires a series, but got %s', [seriesType.ToString]);
|
|
|
|
Result := SetType(TDataValue.FromIntf<ISeriesLengthNode>(Node), TTypes.Ordinal);
|
|
end;
|
|
|
|
end.
|