141 lines
5.4 KiB
C#
141 lines
5.4 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 VarDeclNode : DeclarationNode
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{
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public VarDeclNode(IToken payload)
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: base(payload)
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{
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}
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public TypeNode IdNode { get { return (TypeNode)TigerChildren[0]; } }
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public TypeNode TypeNode { get { return (TypeNode)TigerChildren[1]; } }
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public ExpressionNode RightExpressionNode { get { return (ExpressionNode)TigerChildren[2]; } }
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public VariableInfo VariableInfo { get; set; }
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public bool IsAutoVariable { get { return this.TypeNode is FillInTypeNode; } }
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public override void CheckSemantics(TigerScope scope, Report report)
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{
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string name = this.IdNode.Name;
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if (scope.CanFindFunVarInfo(name, true))
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{
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report.AddError(this.Line, this.Column,
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"Redeclared local variable or function: '{0}'.",
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name);
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this.IsOK = false;
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return;
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}
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FunctionInfo outerfunctionInfo = scope.FindFunctionInfo(name, false);
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if (outerfunctionInfo != null)
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{
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if (outerfunctionInfo.IsStandard)
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{
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report.AddError(this.Line, this.Column,
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"Cannot define variable name with standard function: '{0}'.",
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name);
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this.IsOK = false;
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return;
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}
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else
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report.AddWarning(this.Line, this.Column,
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"Variable name hides outer scope variable or function: '{0}'.",
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name);
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}
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this.RightExpressionNode.CheckSemantics(scope, report);
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if (!this.RightExpressionNode.IsOk)
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{
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this.IsOK = false;
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return;
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}
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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 expression must evaluate to a returning value.");
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this.IsOK = false;
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return;
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}
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this.TypeNode.CheckSemantics(scope, report);
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TigerType returnType = this.RightExpressionNode.TigerType;
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if (!this.IsAutoVariable)
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{
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TigerTypeInfo tigerTypeInfo = scope.FindTypeInfo(this.TypeNode.Name, false);
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if (tigerTypeInfo == null)
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{
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report.AddError(this.Line, this.Column, "Undeclared type: '{0}'.", this.TypeNode.Name);
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this.IsOK = false;
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return;
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}
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/* Assignment */
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if (!this.RightExpressionNode.TigerType.IsAssignableTo(tigerTypeInfo.Holder.TigerType))
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{
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report.AddError(this.Line, this.Column,
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"Type mismatch: Variable declaration and expression do not match " +
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"for '{0}': expecting '{1}' and '{2}' found.",
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name, tigerTypeInfo.Holder.TigerType.Name, this.RightExpressionNode.TigerType.Name);
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this.IsOK = false;
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return;
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}
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returnType = tigerTypeInfo.Holder.TigerType;
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}
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else
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{
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if (returnType.Basetype == BaseType.Nil)
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{
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report.AddError(this.Line, this.Column,
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"An automatic variable cannot be declared from nil expression.");
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this.IsOK = false;
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return;
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}
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}
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this.VariableInfo = new VariableInfo(name, new TigerTypeHolder(returnType), false);
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scope.Add(VariableInfo);
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this.IsOK = true;
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}
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internal override void GenerateCode(ModuleBuilder moduleBuilder)
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{
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this.RightExpressionNode.GenerateCode(moduleBuilder);
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this.VariableInfo.ParameterExpression =
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Expression.Parameter(this.VariableInfo.Holder.TigerType.GetCLRType());
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}
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}
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}
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