132 lines
5.1 KiB
C#
132 lines
5.1 KiB
C#
/*
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* Yet Another Tiger Compiler (YATC)
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*
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* Copyright 2014 Damian Valdés Santiago, Juan Carlos Pujol Mainegra
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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using Antlr.Runtime;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection.Emit;
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using YATC.Scope;
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namespace YATC.ASTNodes
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{
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class LetNode : AtomicNode
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{
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public LetNode(IToken payload)
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: base(payload)
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{
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}
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public IEnumerable<DeclarationNode> DeclarationNodes { get { return TigerChildren[0].TigerChildren.Cast<DeclarationNode>(); } }
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public ExprSeqNode ExprSeqNode
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{
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get
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{
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return (ExprSeqNode)TigerChildren[1];
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}
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}
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public override void CheckSemantics(TigerScope scope, Report report)
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{
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TigerScope innerScope = scope.CreateChildScope();
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foreach (var declarationNode in this.DeclarationNodes)
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{
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declarationNode.CheckSemantics(innerScope, report);
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if (!declarationNode.IsOK)
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{
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this.TigerType = TigerType.Error;
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return;
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}
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}
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this.ExprSeqNode.CheckSemantics(innerScope, report);
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if (!this.ExprSeqNode.IsOk || scope.ContainsType(this.ExprSeqNode.TigerType, false))
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this.TigerType = this.ExprSeqNode.TigerType;
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else
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{
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report.AddError(this.Line, this.Column,
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"Type mismatch: Type '{0}' returned from let declaration is not " +
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"defined in an outer scope, or it is a different definition.",
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this.ExprSeqNode.TigerType.Name);
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this.TigerType = TigerType.Error;
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}
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}
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internal override void GenerateCode(ModuleBuilder moduleBuilder)
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{
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foreach (var declarationNode in DeclarationNodes)
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declarationNode.GenerateCode(moduleBuilder);
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if (this.ExprSeqNode.ExpressionNodes != null)
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foreach (var expressionNode in this.ExprSeqNode.ExpressionNodes)
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expressionNode.GenerateCode(moduleBuilder);
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// variables
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IEnumerable<VarDeclNode> varDeclNodes =
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this.DeclarationNodes.Where(x => x is VarDeclNode).Cast<VarDeclNode>();
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IEnumerable<ParameterExpression> variables =
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varDeclNodes.Select(x => x.VariableInfo.ParameterExpression);
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IEnumerable<Expression> initVariablesExpressions =
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varDeclNodes.Select(varDeclNode =>
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Expression.Assign(
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varDeclNode.VariableInfo.ParameterExpression,
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Expression.Convert(
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varDeclNode.RightExpressionNode.VmExpression,
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varDeclNode.VariableInfo.Holder.TigerType.GetCLRType()
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)
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)
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);
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// fundeclseq
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IEnumerable<FunDeclSeqNode> funDeclSeqNodes =
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this.DeclarationNodes.Where(x => x is FunDeclSeqNode).Cast<FunDeclSeqNode>();
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// final
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IEnumerable<Expression> blockExpressions = initVariablesExpressions.Concat(
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this.ExprSeqNode.ExpressionNodes != null ?
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(this.ExprSeqNode.ExpressionNodes.Select(x => x.VmExpression)) :
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new Expression[] { Expression.Empty() }
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);
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var functionClousures = new List<ParameterExpression>();
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var functionAssigns = new List<Expression>();
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foreach (var funDeclSeqNode in funDeclSeqNodes)
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{
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functionClousures.AddRange(funDeclSeqNode.FunctionClousures);
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functionAssigns.AddRange(funDeclSeqNode.FunctionAssigns);
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}
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this.VmExpression = Expression.Block(
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functionClousures.Concat(variables),
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functionAssigns.Concat(blockExpressions));
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}
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}
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}
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