First public commit!

YATC/ASTNodes/LocalNode/DeclarationNode/FundeclNode.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;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection.Emit;
+using YATC.Scope;
+
+namespace YATC.ASTNodes
+{
+    class FunDeclNode : DeclarationNode
+    {
+        public FunDeclNode(IToken payload)
+            : base(payload)
+        {
+        }
+
+        public TypeNode IdNode { get { return (TypeNode)TigerChildren[0]; } }
+        public TypeFieldNode[] Params
+        {
+            get { return TigerChildren[1].TigerChildren.Cast<TypeFieldNode>().ToArray(); }
+        }
+        public TypeNode TypeNode
+        {
+            get { return TigerChildren[2].TigerChildren.Length > 0 ?
+                    (TypeNode)TigerChildren[2].TigerChildren[0] :
+                    null; }
+        }
+        public ExpressionNode ExpressionBodyNode { get { return (ExpressionNode)TigerChildren[3]; } }
+
+        public string Name { get { return this.IdNode.Name; } }
+        public FunctionInfo FunctionInfo;
+
+        public override void CheckSemantics(TigerScope scope, Report report)
+        {
+            FunctionInfo = scope.FindFunctionInfo(this.Name, true);
+
+            if (FunctionInfo == null)
+                throw new NullReferenceException();
+
+            var innerScope = scope.CreateChildScope();
+            foreach (var parameterInfo in FunctionInfo.ParameterInfo)
+            {
+                if (innerScope.CanFindFunVarInfo(parameterInfo.Name, false))
+                    report.AddWarning(this.Line, this.Column, 
+                        "Parameter name hides outer scope variable or function in '{0}': '{1}'.",
+                        this.Name, parameterInfo.Name);
+                innerScope.Add(parameterInfo);
+            }
+
+            this.ExpressionBodyNode.CheckSemantics(innerScope, report);
+
+            // chequeando que el tipo de retorno sea el mismo que el tipo de la expresion,
+            // no se hace salvedad en el caso de los procedures.
+            if (!this.ExpressionBodyNode.TigerType.IsAssignableTo(FunctionInfo.Holder.TigerType))
+            {
+                report.AddError(this.Line, this.Column,
+                    "Type mismatch: Function or procedure return and expression types in '{0}': " +
+                    "Expecting '{1}' and '{2}' found.",
+                    this.Name, FunctionInfo.Holder.TigerType.Name, this.ExpressionBodyNode.TigerType.Name);
+                this.IsOK = false;
+                return;
+            }
+
+            this.IsOK = true;
+        }
+
+        public Type DelegateType;
+
+        internal ParameterExpression GenerateHeaderCode()
+        {
+            bool funRets = FunctionInfo.Holder.TigerType.Basetype != BaseType.Void;
+
+            Type[] paramTypes = new Type[this.FunctionInfo.ParameterInfo.Length + (funRets ? 1 : 0)];
+            for (int i = 0; i < this.FunctionInfo.ParameterInfo.Length; i++)
+                paramTypes[i] = this.FunctionInfo.ParameterInfo[i].Holder.TigerType.GetCLRType();
+
+            if (funRets)
+                paramTypes[this.Params.Length] = this.FunctionInfo.Holder.TigerType.GetCLRType();
+
+            DelegateType = funRets
+                                ? Expression.GetFuncType(paramTypes)
+                                : Expression.GetActionType(paramTypes);
+
+            var paramExpr = Expression.Parameter(DelegateType);
+
+            FunctionInfo.LambdaExpression = paramExpr;
+            return paramExpr;
+        }
+
+        internal override void GenerateCode(ModuleBuilder moduleBuilder)
+        {
+            var paramsExprs = new ParameterExpression[this.Params.Length];
+            for (int i = 0; i < Params.Length; i++)
+            {
+                paramsExprs[i] = Expression.Parameter(this.FunctionInfo.ParameterInfo[i].Holder.TigerType.GetCLRType());
+                FunctionInfo.ParameterInfo[i].ParameterExpression = paramsExprs[i];
+            }
+
+            this.ExpressionBodyNode.GenerateCode(moduleBuilder);
+
+            Expression bodyExpr = this.FunctionInfo.Holder.TigerType.Basetype == BaseType.Void
+                                      ? Expression.Block(
+                                            this.ExpressionBodyNode.VmExpression, 
+                                            Expression.Empty()
+                                        )
+                                      : (Expression)Expression.Convert(
+                                            ExpressionBodyNode.VmExpression,
+                                            this.FunctionInfo.Holder.TigerType.GetCLRType()
+                                        );
+
+            this.VmExpression = Expression.Lambda(
+                //DelegateType,
+                bodyExpr,
+                this.Name,
+                paramsExprs
+            );
+        }
+    }
+}