First public commit!

YATC/ASTNodes/LocalNode/ExpressionNode/NegNode.cs

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+/*
+ *  Yet Another Tiger Compiler (YATC)
+ *
+ *  Copyright 2014 Damian Valdés Santiago, Juan Carlos Pujol Mainegra
+ *  
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *  
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.  
+ *
+ */
+
+using Antlr.Runtime;
+using System.Linq.Expressions;
+using System.Reflection.Emit;
+using YATC.Scope;
+
+namespace YATC.ASTNodes
+{
+    /// <summary>
+    /// Permite poner números negativos
+    /// </summary>
+    class NegNode : ExpressionNode
+    {
+        public NegNode(IToken payload)
+            : base(payload)
+        {
+        }
+
+        protected ExpressionNode OperandNode { get { return (ExpressionNode)TigerChildren[0]; } }
+
+        public override void CheckSemantics(TigerScope scope, Report report)
+        {
+            this.OperandNode.CheckSemantics(scope, report);
+            if (!this.OperandNode.IsOk)
+            {
+                this.TigerType = TigerType.Error;
+                return;
+            }
+
+            if (OperandNode.TigerType.Basetype == BaseType.Void)
+            {
+                this.TigerType = TigerType.Error;
+                report.AddError(this.Line, this.Column, "Type mismatch: Invalid use of unary minus operator with a non-valued expression.");
+                return;
+            }
+
+            if (OperandNode.TigerType.Basetype != BaseType.Int)
+            {
+                this.TigerType = TigerType.Error;
+                report.AddError(this.Line, this.Column, "Type mismatch: Invalid use of unary minus operator with a non-int expression.");
+                return;
+            }
+
+            this.TigerType = TigerType.Int;
+        }
+
+        internal override void GenerateCode(ModuleBuilder moduleBuilder)
+        {
+            this.OperandNode.GenerateCode(moduleBuilder);
+            this.VmExpression = Expression.Negate(this.OperandNode.VmExpression);
+        }
+    }
+}