95 lines
3.6 KiB
C#
95 lines
3.6 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 WhileNode : StatementNode, IBreakeableNode
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{
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public WhileNode(IToken payload)
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: base(payload)
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{
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}
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public LabelTarget BreakTarget { get; set; }
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public ExpressionNode ConditionExpression { get { return (ExpressionNode)TigerChildren[0]; } }
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public ExpressionNode DoExpression { 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.ConditionExpression.CheckSemantics(scope, report);
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this.DoExpression.CheckSemantics(scope, report);
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if (!this.ConditionExpression.IsOk || !this.DoExpression.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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if (this.ConditionExpression.TigerType.Basetype != BaseType.Int)
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{
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report.AddError(Line, Column,
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"Type mismatch: Expecting integer (or alias) type on condition expression: '{0}' was found.",
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this.ConditionExpression.TigerType.Name);
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this.TigerType = TigerType.Error;
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return;
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}
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if (this.DoExpression.TigerType.Basetype != BaseType.Void)
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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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"Type mismatch: Expecting void return type in while expression: '{0}' was found.",
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this.DoExpression.TigerType.Name);
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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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BreakTarget = Expression.Label();
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this.ConditionExpression.GenerateCode(moduleBuilder);
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this.DoExpression.GenerateCode(moduleBuilder);
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ConditionalExpression conditionalExpression = Expression.IfThenElse(
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Expression.NotEqual(this.ConditionExpression.VmExpression, Expression.Constant(0)),
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this.DoExpression.VmExpression,
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Expression.Break(this.BreakTarget));
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this.VmExpression = Expression.Loop(conditionalExpression, this.BreakTarget);
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}
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}
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}
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