Michael Schimmel
549 lines
20 KiB
ObjectPascal
549 lines
20 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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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 Node: IAstNode; const AType: IStaticType): IAstNode;
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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): IAstNode; override;
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function VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode; override;
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function VisitAssignment(const Node: IAssignmentNode): IAstNode; override;
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function VisitLambdaExpression(const Node: ILambdaExpressionNode): IAstNode; override;
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function VisitFunctionCall(const Node: IFunctionCallNode): IAstNode; override;
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function VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode; override;
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function VisitIfExpression(const Node: IIfExpressionNode): IAstNode; override;
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function VisitTernaryExpression(const Node: ITernaryExpressionNode): IAstNode; override;
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function VisitBinaryExpression(const Node: IBinaryExpressionNode): IAstNode; override;
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function VisitUnaryExpression(const Node: IUnaryExpressionNode): IAstNode; override;
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function VisitMemberAccess(const Node: IMemberAccessNode): IAstNode; override;
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function VisitIndexer(const Node: IIndexerNode): IAstNode; override;
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function VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode; override;
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function VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode; override;
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function VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode; override;
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function VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode; override;
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function VisitRecurNode(const Node: IRecurNode): IAstNode; override;
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// Base cases (types are already set by Binder)
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function VisitConstant(const Node: IConstantNode): IAstNode; override;
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function VisitKeyword(const Node: IKeywordNode): IAstNode; override;
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// Compile-time nodes (should not be present)
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function VisitMacroExpansionNode(const Node: IMacroExpansionNode): IAstNode; override;
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function VisitMacroDefinition(const Node: IMacroDefinitionNode): IAstNode; 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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Result := Accept(RootNode); // Use IAstNode-returning Accept
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if not Assigned(Result) then
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Result := TAst.Block([]);
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// (Result as TAstNode).StaticType is set by the last Visit call
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end;
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function TTypeChecker.SetType(const Node: IAstNode; const AType: IStaticType): IAstNode;
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begin
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if Assigned(Node) then
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(Node as TAstNode).StaticType := AType;
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Result := Node;
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end;
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function TTypeChecker.VisitConstant(const Node: IConstantNode): IAstNode;
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begin
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// Type was set by Binder, just propagate it up.
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Result := inherited VisitConstant(Node);
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end;
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function TTypeChecker.VisitKeyword(const Node: IKeywordNode): IAstNode;
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begin
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// Type was set by Binder, just propagate it up.
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Result := inherited VisitKeyword(Node);
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end;
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function TTypeChecker.VisitIdentifier(const Node: IIdentifierNode): IAstNode;
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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 := inherited VisitIdentifier(Node);
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end;
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function TTypeChecker.VisitRecurNode(const Node: IRecurNode): IAstNode;
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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 := inherited VisitRecurNode(Node);
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end;
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function TTypeChecker.VisitMacroDefinition(const Node: IMacroDefinitionNode): IAstNode;
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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): IAstNode;
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begin
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// TypeChecker runs *after* expansion, so we just visit the body.
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Result := Accept(Node.ExpandedBody);
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end;
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function TTypeChecker.VisitVariableDeclaration(const Node: IVariableDeclarationNode): IAstNode;
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var
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initType: IStaticType;
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boundIdent: TIdentifierNode;
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adr: TResolvedAddress;
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begin
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// 1. Visit children first (Identifier is leaf, Initializer is traversed)
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inherited;
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// 2. Get initializer type
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if Assigned(Node.Initializer) then
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initType := (Node.Initializer as TAstNode).StaticType
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else
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initType := TTypes.Void;
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// 3. Get the address from the bound identifier.
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boundIdent := (Node.Identifier as TIdentifierNode);
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adr := boundIdent.Address;
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// 4. 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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// 5. Update the static types of the nodes themselves.
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(boundIdent as TAstNode).StaticType := initType;
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Result := SetType(Node, initType);
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end;
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function TTypeChecker.VisitAssignment(const Node: IAssignmentNode): IAstNode;
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var
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targetType, sourceType: IStaticType;
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begin
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// 1. Visit children first (Identifier, Value)
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inherited;
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// 2. Get types
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targetType := (Node.Identifier as TAstNode).StaticType;
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sourceType := (Node.Value as TAstNode).StaticType;
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// 3. Check assignment
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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(Node, targetType);
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end;
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function TTypeChecker.VisitLambdaExpression(const Node: ILambdaExpressionNode): IAstNode;
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var
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boundNode: TLambdaExpressionNode;
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bodyType, methodType: IStaticType;
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paramTypes: TArray<IStaticType>;
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i: Integer;
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savedDescriptor: IScopeDescriptor;
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begin
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boundNode := (Node as TLambdaExpressionNode);
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// 1. Enter the lambda's scope (which Binder already created)
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savedDescriptor := FCurrentDescriptor;
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FCurrentDescriptor := boundNode.ScopeDescriptor;
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try
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// 2. Parameters are leaves, so we don't try to evaluate them
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// 3. Get 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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// 4. Visit the body to infer its return type
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Accept(boundNode.Body);
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bodyType := (boundNode.Body as TAstNode).StaticType;
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// 5. Create the final method type
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methodType := TTypes.CreateMethod(paramTypes, bodyType);
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// 6. 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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// 7. Restore parent descriptor
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FCurrentDescriptor := savedDescriptor;
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end;
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// 8. Set the type of the lambda node itself
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Result := SetType(boundNode, methodType);
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end;
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function TTypeChecker.VisitFunctionCall(const Node: IFunctionCallNode): IAstNode;
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var
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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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inherited;
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// 2. Get callee type (now inferred)
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calleeType := (Node.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(Node.Arguments) <> Length(signature.ParamTypes) then
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raise ETypeException
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.CreateFmt('Function expects %d arguments, but got %d', [Length(signature.ParamTypes), Length(Node.Arguments)]);
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retType := signature.ReturnType;
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// Check argument types
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for i := 0 to High(Node.Arguments) do
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begin
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var argType := (Node.Arguments[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(Node, retType);
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end;
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function TTypeChecker.VisitBlockExpression(const Node: IBlockExpressionNode): IAstNode;
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var
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blockType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Type is type of last expression
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if Length(Node.Expressions) > 0 then
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blockType := (Node.Expressions[High(Node.Expressions)] as TAstNode).StaticType
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else
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blockType := TTypes.Void;
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Result := SetType(Node, blockType);
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end;
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function TTypeChecker.VisitIfExpression(const Node: IIfExpressionNode): IAstNode;
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var
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conditionType, thenType, elseType, resultType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Check condition
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conditionType := (Node.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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// 3. Promote branch types
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thenType := (Node.ThenBranch as TAstNode).StaticType;
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elseType :=
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if Node.ElseBranch <> nil then (Node.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(Node, resultType);
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end;
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function TTypeChecker.VisitTernaryExpression(const Node: ITernaryExpressionNode): IAstNode;
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var
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conditionType, thenType, elseType, resultType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Check condition
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conditionType := (Node.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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// 3. Promote branch types
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thenType := (Node.ThenBranch as TAstNode).StaticType;
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elseType := (Node.ElseBranch as TAstNode).StaticType;
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resultType := TTypeRules.Promote(thenType, elseType);
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Result := SetType(Node, resultType);
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end;
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function TTypeChecker.VisitBinaryExpression(const Node: IBinaryExpressionNode): IAstNode;
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var
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leftType, rightType, resultType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Get types
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leftType := (Node.Left as TAstNode).StaticType;
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rightType := (Node.Right as TAstNode).StaticType;
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// 3. Resolve
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resultType := TTypeRules.ResolveBinaryOp(Node.Operator, leftType, rightType);
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Result := SetType(Node, resultType);
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end;
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function TTypeChecker.VisitUnaryExpression(const Node: IUnaryExpressionNode): IAstNode;
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var
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rightType, resultType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Get types
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rightType := (Node.Right as TAstNode).StaticType;
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// 3. Resolve
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resultType := TTypeRules.ResolveUnaryOp(Node.Operator, rightType);
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Result := SetType(Node, resultType);
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end;
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function TTypeChecker.VisitMemberAccess(const Node: IMemberAccessNode): IAstNode;
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var
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baseType, elemType: IStaticType;
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fieldIndex: Integer;
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begin
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// 1. Visit children
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inherited;
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// 2. Get types
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baseType := (Node.Base as TAstNode).StaticType;
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elemType := TTypes.Unknown;
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// 3. Resolve
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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(Node, elemType);
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end;
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function TTypeChecker.VisitIndexer(const Node: IIndexerNode): IAstNode;
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var
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baseType, indexType, elemType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Get types
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baseType := (Node.Base as TAstNode).StaticType;
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indexType := (Node.Index as TAstNode).StaticType;
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elemType := TTypes.Unknown;
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// 3. Resolve
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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(Node, elemType);
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end;
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function TTypeChecker.VisitRecordLiteral(const Node: IRecordLiteralNode): IAstNode;
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var
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i: Integer;
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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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N: TGenericRecordLiteralNode; // Parser creates this type
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begin
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// 1. Visit all child nodes first to infer their types
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inherited;
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N := (Node as TGenericRecordLiteralNode);
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SetLength(scalarDefFields, Length(N.Fields));
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allScalar := True;
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// 2. Check if this record literal can be a TScalarRecord
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for i := 0 to High(N.Fields) do
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begin
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valNode := N.Fields[i].Value;
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valType := (valNode as TAstNode).StaticType;
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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(N.Fields[i].Key.Value, scalarKind);
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end;
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// 3. Create the appropriate record type (Scalar or Generic) and mutate the node
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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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N.Definition := def; // Mutate
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N.GenericDefinition := nil; // Mutate
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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(N.Fields));
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for i := 0 to High(N.Fields) do
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genDefFields[i] := TPair<IKeyword, IStaticType>.Create(N.Fields[i].Key.Value, (N.Fields[i].Value as TAstNode).StaticType);
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var genDef := TGenericRecordRegistry.Intern(genDefFields);
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staticType := TTypes.CreateGenericRecord(genDef);
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N.GenericDefinition := genDef; // Mutate
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N.Definition := nil; // Mutate
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end;
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Result := SetType(N, staticType);
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end;
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function TTypeChecker.VisitCreateSeries(const Node: ICreateSeriesNode): IAstNode;
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begin
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// Type was set by Binder, just propagate it up.
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Result := inherited VisitCreateSeries(Node);
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end;
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function TTypeChecker.VisitAddSeriesItem(const Node: IAddSeriesItemNode): IAstNode;
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var
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seriesType, valueType: IStaticType;
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begin
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// 1. Visit children
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inherited;
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// 2. Get types
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seriesType := (Node.Series as TAstNode).StaticType;
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valueType := (Node.Value as TAstNode).StaticType;
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// 3. Check types
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if (seriesType.Kind <> stUnknown) then
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begin
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if (seriesType.Kind <> TStaticTypeKind.stSeries) then
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raise ETypeException.CreateFmt('"add" requires a series as its first argument, but got %s', [seriesType.ToString]);
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if not TTypeRules.CanAssign(seriesType.ElementType, valueType) then
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raise ETypeException
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.CreateFmt('Cannot add item of type %s to series of type %s', [valueType.ToString, seriesType.ElementType.ToString]);
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end;
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if (Node.Lookback <> nil) then
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begin
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var lookbackType := (Node.Lookback as TAstNode).StaticType;
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if (lookbackType.Kind <> stUnknown) and not (lookbackType.Kind = TStaticTypeKind.stOrdinal) then
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raise ETypeException.Create('Lookback parameter for "add" must be an ordinal value.');
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end;
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Result := SetType(Node, TTypes.Void);
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end;
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function TTypeChecker.VisitSeriesLength(const Node: ISeriesLengthNode): IAstNode;
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|
var
|
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seriesType: IStaticType;
|
|
begin
|
|
// 1. Visit children
|
|
inherited;
|
|
|
|
// 2. Get type
|
|
seriesType := (Node.Series as TAstNode).StaticType;
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|
|
|
// 3. Check type
|
|
if (seriesType.Kind <> stUnknown)
|
|
and (seriesType.Kind <> TStaticTypeKind.stSeries)
|
|
and (seriesType.Kind <> TStaticTypeKind.stRecordSeries) then
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raise ETypeException.CreateFmt('"length" requires a series, but got %s', [seriesType.ToString]);
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|
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Result := SetType(Node, TTypes.Ordinal);
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|
end;
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end.
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