106 lines
4.2 KiB
C#
106 lines
4.2 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.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 AssignNode : StatementNode
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{
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public AssignNode(IToken payload)
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: base(payload)
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{
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}
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public VarAccessNode LeftValueNode { get { return (VarAccessNode)TigerChildren[0]; } }
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public ExpressionNode RightExpressionNode { get { return (ExpressionNode)TigerChildren[1]; } }
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public override void CheckSemantics(TigerScope scope, Report report)
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{
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this.LeftValueNode.CheckSemantics(scope, report);
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this.RightExpressionNode.CheckSemantics(scope, report);
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// No se reporta el error para evitar cascadas de errores
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this.TigerType = this.LeftValueNode.IsOk && this.RightExpressionNode.IsOk
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? TigerType.Void
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: TigerType.Error;
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if (!this.IsOk)
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return;
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if (this.RightExpressionNode.TigerType.Equals(TigerType.Void))
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{
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report.AddError(this.Line, this.Column, "Right hand side must evaluate to a returning value.");
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this.TigerType = TigerType.Error;
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return;
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}
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/* Assignment */
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if (!this.RightExpressionNode.TigerType.IsAssignableTo(this.LeftValueNode.TigerType))
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{
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report.AddError(this.Line, this.Column,
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"Type mismatch: Types of variable declaration and expression do not match: '{0}' and '{1}'",
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this.LeftValueNode.TigerType.Name, this.RightExpressionNode.TigerType.Name);
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this.TigerType = TigerType.Error;
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return;
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}
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// checks if left variable is not read-only, i.e., it is not defined in a ForNode
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// la segunda pregunta accessNode == null es por si se quiere agregar campos o arrays
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if (this.LeftValueNode.VariableInfo.IsReadOnly && this.LeftValueNode.AccessNode == null)
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{
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this.TigerType = TigerType.Error;
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report.AddError(this.Line, this.Column,
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"Cannot assign to a read-only variable (it may be declared within a for control structure).");
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return;
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}
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this.TigerType = TigerType.Void;
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}
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internal override void GenerateCode(ModuleBuilder moduleBuilder)
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{
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this.LeftValueNode.GenerateCode(moduleBuilder);
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this.RightExpressionNode.GenerateCode(moduleBuilder);
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//int isOK = (int)(34 < 342);
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this.VmExpression =
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Expression.Block(
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Expression.Assign(
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this.LeftValueNode.VmExpression,
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Expression.Convert(
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this.RightExpressionNode.VmExpression,
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this.LeftValueNode.TigerType.GetCLRType()
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)
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),
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Expression.Empty());
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}
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}
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}
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