646 lines
24 KiB
C#
646 lines
24 KiB
C#
using NubLang.Common;
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using NubLang.Diagnostics;
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using NubLang.Syntax.Binding.Node;
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using NubLang.Syntax.Parsing.Node;
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using NubLang.Syntax.Tokenization;
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namespace NubLang.Syntax.Binding;
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public sealed class Binder
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{
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private readonly SyntaxTree _syntaxTree;
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private readonly DefinitionTable _definitionTable;
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private readonly Stack<Variable> _variables = [];
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private readonly Stack<NubType> _funcReturnTypes = [];
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private readonly Stack<int> _variableScopes = [];
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public Binder(SyntaxTree syntaxTree, DefinitionTable definitionTable)
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{
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_syntaxTree = syntaxTree;
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_definitionTable = definitionTable;
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}
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public BoundSyntaxTree Bind()
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{
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_variables.Clear();
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_funcReturnTypes.Clear();
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_variableScopes.Clear();
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var diagnostics = new List<Diagnostic>();
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var definitions = new List<BoundDefinition>();
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foreach (var definition in _syntaxTree.Definitions)
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{
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try
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{
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definitions.Add(BindTopLevel(definition));
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}
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catch (BindException e)
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{
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diagnostics.Add(e.Diagnostic);
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}
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}
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return new BoundSyntaxTree(_syntaxTree.Namespace, definitions, diagnostics);
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}
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private BoundDefinition BindTopLevel(DefinitionSyntax node)
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{
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return node switch
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{
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ExternFuncSyntax topLevel => BindExternFuncDefinition(topLevel),
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TraitImplSyntax topLevel => BindTraitImplementation(topLevel),
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TraitSyntax topLevel => BindTraitDefinition(topLevel),
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LocalFuncSyntax topLevel => BindLocalFuncDefinition(topLevel),
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StructSyntax topLevel => BindStruct(topLevel),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private BoundTraitImpl BindTraitImplementation(TraitImplSyntax node)
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{
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_variables.Clear();
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var functions = new List<BoundTraitFuncImpl>();
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foreach (var func in node.Functions)
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{
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var signature = BindFuncSignature(func.Signature);
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var body = BindFuncBody(func.Body, signature.ReturnType, signature.Parameters);
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functions.Add(new BoundTraitFuncImpl(func.Tokens, func.Name, signature, body));
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}
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return new BoundTraitImpl(node.Tokens, node.Namespace, node.TraitType, node.ForType, functions);
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}
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private BoundTrait BindTraitDefinition(TraitSyntax node)
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{
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var functions = new List<BoundTraitFunc>();
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foreach (var function in node.Functions)
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{
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functions.Add(new BoundTraitFunc(node.Tokens, function.Name, BindFuncSignature(function.Signature)));
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}
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return new BoundTrait(node.Tokens, node.Namespace, node.Name, functions);
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}
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private BoundStruct BindStruct(StructSyntax node)
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{
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var structFields = new List<BoundStructField>();
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foreach (var field in node.Fields)
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{
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var value = Optional.Empty<BoundExpression>();
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if (field.Value.HasValue)
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{
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value = BindExpression(field.Value.Value, field.Type);
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}
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structFields.Add(new BoundStructField(field.Tokens, field.Index, field.Name, field.Type, value));
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}
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return new BoundStruct(node.Tokens, node.Namespace, node.Name, structFields);
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}
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private BoundExternFunc BindExternFuncDefinition(ExternFuncSyntax node)
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{
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return new BoundExternFunc(node.Tokens, node.Namespace, node.Name, node.CallName, BindFuncSignature(node.Signature));
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}
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private BoundLocalFunc BindLocalFuncDefinition(LocalFuncSyntax node)
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{
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_variables.Clear();
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var signature = BindFuncSignature(node.Signature);
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var body = BindFuncBody(node.Body, signature.ReturnType, signature.Parameters);
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return new BoundLocalFunc(node.Tokens, node.Namespace, node.Name, signature, body);
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}
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private BoundStatement BindStatement(StatementSyntax node)
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{
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return node switch
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{
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AssignmentSyntax statement => BindAssignment(statement),
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BreakSyntax statement => BindBreak(statement),
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ContinueSyntax statement => BindContinue(statement),
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IfSyntax statement => BindIf(statement),
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ReturnSyntax statement => BindReturn(statement),
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StatementExpressionSyntax statement => BindStatementExpression(statement),
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VariableDeclarationSyntax statement => BindVariableDeclaration(statement),
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WhileSyntax statement => BindWhile(statement),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private BoundStatement BindAssignment(AssignmentSyntax statement)
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{
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var expression = BindExpression(statement.Target);
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var value = BindExpression(statement.Value, expression.Type);
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return new BoundAssignment(statement.Tokens, expression, value);
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}
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private BoundBreak BindBreak(BreakSyntax statement)
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{
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return new BoundBreak(statement.Tokens);
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}
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private BoundContinue BindContinue(ContinueSyntax statement)
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{
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return new BoundContinue(statement.Tokens);
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}
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private BoundIf BindIf(IfSyntax statement)
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{
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var elseStatement = Optional.Empty<Variant<BoundIf, BoundBlock>>();
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if (statement.Else.HasValue)
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{
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elseStatement = statement.Else.Value.Match<Variant<BoundIf, BoundBlock>>
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(
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elseIf => BindIf(elseIf),
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@else => BindBlock(@else)
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);
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}
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return new BoundIf(statement.Tokens, BindExpression(statement.Condition, new NubPrimitiveType(PrimitiveTypeKind.Bool)), BindBlock(statement.Body), elseStatement);
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}
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private BoundReturn BindReturn(ReturnSyntax statement)
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{
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var value = Optional.Empty<BoundExpression>();
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if (statement.Value.HasValue)
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{
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value = BindExpression(statement.Value.Value, _funcReturnTypes.Peek());
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}
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return new BoundReturn(statement.Tokens, value);
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}
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private BoundStatementExpression BindStatementExpression(StatementExpressionSyntax statement)
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{
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return new BoundStatementExpression(statement.Tokens, BindExpression(statement.Expression));
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}
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private BoundVariableDeclaration BindVariableDeclaration(VariableDeclarationSyntax statement)
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{
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NubType? type = null;
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if (statement.ExplicitType.HasValue)
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{
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type = statement.ExplicitType.Value;
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}
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var assignment = Optional<BoundExpression>.Empty();
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if (statement.Assignment.HasValue)
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{
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var boundValue = BindExpression(statement.Assignment.Value, type);
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assignment = boundValue;
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type = boundValue.Type;
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}
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if (type == null)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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_variables.Push(new Variable(statement.Name, type));
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return new BoundVariableDeclaration(statement.Tokens, statement.Name, assignment, type);
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}
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private BoundWhile BindWhile(WhileSyntax statement)
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{
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return new BoundWhile(statement.Tokens, BindExpression(statement.Condition, new NubPrimitiveType(PrimitiveTypeKind.Bool)), BindBlock(statement.Body));
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}
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private BoundExpression BindExpression(ExpressionSyntax node, NubType? expectedType = null)
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{
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return node switch
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{
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AddressOfSyntax expression => BindAddressOf(expression),
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AnonymousFuncSyntax expression => BindAnonymousFunc(expression, expectedType),
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ArrayIndexAccessSyntax expression => BindArrayIndexAccess(expression),
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ArrayInitializerSyntax expression => BindArrayInitializer(expression),
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BinaryExpressionSyntax expression => BindBinaryExpression(expression),
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DereferenceSyntax expression => BindDereference(expression),
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FuncCallSyntax expression => BindFuncCall(expression),
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IdentifierSyntax expression => BindIdentifier(expression),
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LiteralSyntax expression => BindLiteral(expression, expectedType),
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MemberAccessSyntax expression => BindMemberAccess(expression),
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StructInitializerSyntax expression => BindStructInitializer(expression),
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UnaryExpressionSyntax expression => BindUnaryExpression(expression),
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_ => throw new ArgumentOutOfRangeException(nameof(node))
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};
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}
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private BoundAddressOf BindAddressOf(AddressOfSyntax expression)
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{
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var inner = BindExpression(expression.Expression);
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return new BoundAddressOf(expression.Tokens, new NubPointerType(inner.Type), inner);
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}
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private BoundAnonymousFunc BindAnonymousFunc(AnonymousFuncSyntax expression, NubType? expectedType = null)
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{
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if (expectedType == null)
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{
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throw new BindException(Diagnostic.Error("Cannot infer argument types for anonymous function").At(expression).Build());
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}
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if (expectedType is not NubFuncType funcType)
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{
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throw new BindException(Diagnostic.Error($"Expected {expectedType}, but got anonymous function").At(expression).Build());
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}
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var parameters = new List<BoundFuncParameter>();
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for (var i = 0; i < expression.Parameters.Count; i++)
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{
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if (i >= funcType.Parameters.Count)
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{
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throw new BindException(Diagnostic.Error($"Anonymous function expected a maximum of {funcType.Parameters.Count} arguments").Build());
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}
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var expectedParameterType = funcType.Parameters[i];
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var parameter = expression.Parameters[i];
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parameters.Add(new BoundFuncParameter(parameter.Tokens, parameter.Name, expectedParameterType));
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}
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var body = BindFuncBody(expression.Body, funcType.ReturnType, parameters);
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return new BoundAnonymousFunc(expression.Tokens, new NubFuncType(funcType.ReturnType, parameters.Select(x => x.Type).ToList()), parameters, funcType.ReturnType, body);
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}
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private BoundArrayIndexAccess BindArrayIndexAccess(ArrayIndexAccessSyntax expression)
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{
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var boundArray = BindExpression(expression.Target);
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var elementType = ((NubArrayType)boundArray.Type).ElementType;
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return new BoundArrayIndexAccess(expression.Tokens, elementType, boundArray, BindExpression(expression.Index, new NubPrimitiveType(PrimitiveTypeKind.U64)));
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}
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private BoundArrayInitializer BindArrayInitializer(ArrayInitializerSyntax expression)
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{
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return new BoundArrayInitializer(expression.Tokens, new NubArrayType(expression.ElementType), BindExpression(expression.Capacity, new NubPrimitiveType(PrimitiveTypeKind.U64)), expression.ElementType);
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}
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private BoundBinaryExpression BindBinaryExpression(BinaryExpressionSyntax expression)
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{
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var boundLeft = BindExpression(expression.Left);
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var boundRight = BindExpression(expression.Right, boundLeft.Type);
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return new BoundBinaryExpression(expression.Tokens, boundLeft.Type, boundLeft, BindBinaryOperator(expression.Operator), boundRight);
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}
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private BoundDereference BindDereference(DereferenceSyntax expression)
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{
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var boundExpression = BindExpression(expression.Expression);
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var dereferencedType = ((NubPointerType)boundExpression.Type).BaseType;
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return new BoundDereference(expression.Tokens, dereferencedType, boundExpression);
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}
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private BoundFuncCall BindFuncCall(FuncCallSyntax expression)
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{
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var boundExpression = BindExpression(expression.Expression);
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var funcType = (NubFuncType)boundExpression.Type;
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var parameters = new List<BoundExpression>();
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foreach (var (i, parameter) in expression.Parameters.Index())
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{
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if (i >= funcType.Parameters.Count)
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{
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throw new NotImplementedException("Diagnostics not implemented");
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}
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var expectedType = funcType.Parameters[i];
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parameters.Add(BindExpression(parameter, expectedType));
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}
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return new BoundFuncCall(expression.Tokens, funcType.ReturnType, boundExpression, parameters);
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}
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private BoundExpression BindIdentifier(IdentifierSyntax expression)
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{
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var @namespace = expression.Namespace.Or(_syntaxTree.Namespace);
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var localFuncs = _definitionTable.LookupLocalFunc(@namespace, expression.Name).ToArray();
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if (localFuncs.Length > 0)
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{
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if (localFuncs.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Extern func {expression.Namespace}::{expression.Name} has multiple definitions").Build());
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}
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var localFunc = localFuncs[0];
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var type = new NubFuncType(localFunc.Signature.ReturnType, localFunc.Signature.Parameters.Select(p => p.Type).ToList());
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return new BoundLocalFuncIdent(expression.Tokens, type, @namespace, expression.Name);
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}
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var externFuncs = _definitionTable.LookupExternFunc(@namespace, expression.Name).ToArray();
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if (externFuncs.Length > 0)
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{
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if (externFuncs.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Extern func {expression.Namespace}::{expression.Name} has multiple definitions").Build());
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}
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var externFunc = externFuncs[0];
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var type = new NubFuncType(externFunc.Signature.ReturnType, externFunc.Signature.Parameters.Select(p => p.Type).ToList());
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return new BoundExternFuncIdent(expression.Tokens, type, @namespace, expression.Name);
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}
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if (!expression.Namespace.HasValue)
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{
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var variable = _variables.FirstOrDefault(x => x.Name == expression.Name);
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if (variable != null)
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{
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return new BoundVariableIdent(expression.Tokens, variable.Type, variable.Name);
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}
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}
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throw new BindException(Diagnostic.Error($"No identifier with then name {(expression.Namespace.HasValue ? $"{expression.Namespace.Value}::" : "")}{expression.Name} exists").Build());
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}
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private BoundLiteral BindLiteral(LiteralSyntax expression, NubType? expectedType = null)
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{
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var type = expectedType ?? expression.Kind switch
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{
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LiteralKind.Integer => new NubPrimitiveType(PrimitiveTypeKind.I64),
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LiteralKind.Float => new NubPrimitiveType(PrimitiveTypeKind.F64),
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LiteralKind.String => new NubStringType(),
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LiteralKind.Bool => new NubPrimitiveType(PrimitiveTypeKind.Bool),
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_ => throw new ArgumentOutOfRangeException()
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};
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return new BoundLiteral(expression.Tokens, type, expression.Literal, expression.Kind);
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}
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private BoundExpression BindMemberAccess(MemberAccessSyntax expression)
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{
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var boundExpression = BindExpression(expression.Target);
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var traitFuncImpls = _definitionTable.LookupTraitFuncImpl(boundExpression.Type, expression.Member).ToArray();
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if (traitFuncImpls.Length > 0)
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{
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if (traitFuncImpls.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Type {boundExpression.Type} implements multiple traits with the function {expression.Member}").Build());
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}
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var impl = traitFuncImpls[0];
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var type = new NubFuncType(impl.Signature.ReturnType, impl.Signature.Parameters.Select(p => p.Type).ToList());
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return new BoundTraitImplFuncAccess(expression.Tokens, type, boundExpression, expression.Member);
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}
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if (boundExpression.Type is NubCustomType customType)
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{
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var traits = _definitionTable.LookupTrait(customType.Namespace, customType.Name).ToArray();
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if (traits.Length > 0)
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{
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if (traits.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Trait {customType.Namespace}::{customType.Name} has multiple definitions").Build());
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}
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var trait = traits[0];
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var traitFuncs = _definitionTable.LookupTraitFunc(trait, expression.Member).ToArray();
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if (traits.Length > 0)
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{
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if (traits.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Trait {trait.Namespace}::{trait.Name} has multiple functions with the name {expression.Member}").Build());
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}
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var traitFunc = traitFuncs[0];
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var type = new NubFuncType(traitFunc.Signature.ReturnType, traitFunc.Signature.Parameters.Select(p => p.Type).ToList());
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return new BoundTraitFuncAccess(expression.Tokens, type, customType, boundExpression, expression.Member);
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}
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}
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var structs = _definitionTable.LookupStruct(customType.Namespace, customType.Name).ToArray();
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if (structs.Length > 0)
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{
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if (structs.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Struct {customType.Namespace}::{customType.Name} has multiple definitions").Build());
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}
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var @struct = structs[0];
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var fields = _definitionTable.LookupStructField(@struct, expression.Member).ToArray();
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if (fields.Length > 0)
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{
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if (fields.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Struct {@struct.Namespace}::{@struct.Name} has multiple fields with the name {expression.Member}").Build());
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}
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var field = fields[0];
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return new BoundStructFieldAccess(expression.Tokens, field.Type, customType, boundExpression, expression.Member);
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}
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}
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}
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throw new BindException(Diagnostic.Error($"{boundExpression.Type} does not have a member with the name {expression.Member}").Build());
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}
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private BoundStructInitializer BindStructInitializer(StructInitializerSyntax expression)
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{
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if (expression.StructType is not NubCustomType structType)
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{
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throw new BindException(Diagnostic.Error($"Cannot initialize non-struct type {expression.StructType}").Build());
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}
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var structs = _definitionTable.LookupStruct(structType.Namespace, structType.Name).ToArray();
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if (structs.Length == 0)
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{
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throw new BindException(Diagnostic.Error($"Struct {structType.Namespace}::{structType.Name} is not defined").Build());
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}
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if (structs.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Struct {structType.Namespace}::{structType.Name} has multiple definitions").Build());
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}
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var @struct = structs[0];
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var initializers = new Dictionary<string, BoundExpression>();
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foreach (var (field, initializer) in expression.Initializers)
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{
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var fields = _definitionTable.LookupStructField(@struct, field).ToArray();
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if (fields.Length == 0)
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{
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throw new BindException(Diagnostic.Error($"Struct {@struct.Namespace}::{@struct.Name} does not have a field with the name {field}").Build());
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}
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if (fields.Length > 1)
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{
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throw new BindException(Diagnostic.Error($"Struct {@struct.Namespace}::{@struct.Name} has multiple fields with the name {field}").Build());
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}
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initializers[field] = BindExpression(initializer, fields[0].Type);
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}
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return new BoundStructInitializer(expression.Tokens, structType, new NubCustomType(@struct.Namespace, @struct.Name), initializers);
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}
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private BoundUnaryExpression BindUnaryExpression(UnaryExpressionSyntax expression)
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{
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var boundOperand = BindExpression(expression.Operand);
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NubType? type = null;
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switch (expression.Operator)
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{
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case UnaryOperator.Negate:
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{
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boundOperand = BindExpression(expression.Operand, new NubPrimitiveType(PrimitiveTypeKind.I64));
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if (boundOperand.Type.IsNumber)
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{
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type = boundOperand.Type;
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}
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break;
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}
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case UnaryOperator.Invert:
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{
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boundOperand = BindExpression(expression.Operand, new NubPrimitiveType(PrimitiveTypeKind.Bool));
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|
|
|
type = new NubPrimitiveType(PrimitiveTypeKind.Bool);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (type == null)
|
|
{
|
|
throw new NotImplementedException("Diagnostics not implemented");
|
|
}
|
|
|
|
return new BoundUnaryExpression(expression.Tokens, type, BindBinaryOperator(expression.Operator), boundOperand);
|
|
}
|
|
|
|
private BoundFuncSignature BindFuncSignature(FuncSignatureSyntax node)
|
|
{
|
|
var parameters = new List<BoundFuncParameter>();
|
|
|
|
foreach (var parameter in node.Parameters)
|
|
{
|
|
parameters.Add(new BoundFuncParameter(parameter.Tokens, parameter.Name, parameter.Type));
|
|
}
|
|
|
|
return new BoundFuncSignature(node.Tokens, parameters, node.ReturnType);
|
|
}
|
|
|
|
private BoundBinaryOperator BindBinaryOperator(BinaryOperator op)
|
|
{
|
|
return op switch
|
|
{
|
|
BinaryOperator.Equal => BoundBinaryOperator.Equal,
|
|
BinaryOperator.NotEqual => BoundBinaryOperator.NotEqual,
|
|
BinaryOperator.GreaterThan => BoundBinaryOperator.GreaterThan,
|
|
BinaryOperator.GreaterThanOrEqual => BoundBinaryOperator.GreaterThanOrEqual,
|
|
BinaryOperator.LessThan => BoundBinaryOperator.LessThan,
|
|
BinaryOperator.LessThanOrEqual => BoundBinaryOperator.LessThanOrEqual,
|
|
BinaryOperator.Plus => BoundBinaryOperator.Plus,
|
|
BinaryOperator.Minus => BoundBinaryOperator.Minus,
|
|
BinaryOperator.Multiply => BoundBinaryOperator.Multiply,
|
|
BinaryOperator.Divide => BoundBinaryOperator.Divide,
|
|
_ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
|
|
};
|
|
}
|
|
|
|
private BoundUnaryOperator BindBinaryOperator(UnaryOperator op)
|
|
{
|
|
return op switch
|
|
{
|
|
UnaryOperator.Negate => BoundUnaryOperator.Negate,
|
|
UnaryOperator.Invert => BoundUnaryOperator.Invert,
|
|
_ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
|
|
};
|
|
}
|
|
|
|
private BoundBlock BindBlock(BlockSyntax node, IEnumerable<Variable>? variables = null)
|
|
{
|
|
_variableScopes.Push(_variables.Count);
|
|
if (variables != null)
|
|
{
|
|
foreach (var variable in variables)
|
|
{
|
|
_variables.Push(variable);
|
|
}
|
|
}
|
|
|
|
var statements = new List<BoundStatement>();
|
|
|
|
foreach (var statement in node.Statements)
|
|
{
|
|
statements.Add(BindStatement(statement));
|
|
}
|
|
|
|
var count = _variableScopes.Pop();
|
|
while (_variableScopes.Count > count)
|
|
{
|
|
_variableScopes.Pop();
|
|
}
|
|
|
|
return new BoundBlock(node.Tokens, statements);
|
|
}
|
|
|
|
private BoundBlock BindFuncBody(BlockSyntax block, NubType returnType, IEnumerable<BoundFuncParameter> parameters)
|
|
{
|
|
_funcReturnTypes.Push(returnType);
|
|
var body = BindBlock(block, parameters.Select(x => new Variable(x.Name, x.Type)));
|
|
_funcReturnTypes.Pop();
|
|
return body;
|
|
}
|
|
}
|
|
|
|
public record Variable(string Name, NubType Type);
|
|
|
|
public class Scope(Scope? parent)
|
|
{
|
|
private List<Variable> _variables = [];
|
|
|
|
public Variable Lookup(string name)
|
|
{
|
|
var variable = _variables.FirstOrDefault(x => x.Name == name);
|
|
if (variable == null)
|
|
{
|
|
if (parent != null)
|
|
{
|
|
return parent.Lookup(name);
|
|
}
|
|
}
|
|
|
|
throw new BindException(Diagnostic.Error($"Variable {name} is not available in the current scope").Build());
|
|
}
|
|
|
|
public Scope SubScope()
|
|
{
|
|
return new Scope(this);
|
|
}
|
|
}
|
|
|
|
public class BindException : Exception
|
|
{
|
|
public Diagnostic Diagnostic { get; }
|
|
|
|
public BindException(Diagnostic diagnostic) : base(diagnostic.Message)
|
|
{
|
|
Diagnostic = diagnostic;
|
|
}
|
|
} |