Kevin/Tiger
Archived
1
1
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

First public commit!

Browse Source
This commit is contained in:
Juan Carlos Pujol Mainegra
2017-08-18 03:07:43 -05:00
parent 2c754790e6
commit 5a8ddf6978
91 changed files with 17165 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

138
YATC/ASTNodes/LocalNode/ExpressionNode/AtomicNode/IfNode.cs Normal file
View File

@@ -0,0 +1,138 @@
/*
* 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
{
class IfNode : AtomicNode
{
public IfNode(IToken payload)
: base(payload)
{
}
public ExpressionNode ConditionNode { get { return (ExpressionNode)TigerChildren[0]; } }
public ExpressionNode ThenExpressionNode { get { return (ExpressionNode)TigerChildren[1]; } }
public ExpressionNode ElseExpressionNode
{
get
{
return TigerChildren.Length > 2 ? (ExpressionNode)TigerChildren[2] : null;
}
}
public override void CheckSemantics(TigerScope scope, Report report)
{
this.ConditionNode.CheckSemantics(scope, report);
this.ThenExpressionNode.CheckSemantics(scope, report);
bool allOk = this.ConditionNode.IsOk && this.ThenExpressionNode.IsOk;
if (this.ConditionNode.IsOk)
{
if (this.ConditionNode.TigerType.Basetype == BaseType.Void)
{
report.AddError(this.Line, this.Column,
"Type mismatch: Invalid use of if condition with a non-valued expression.",
this.ConditionNode.TigerType.Name);
this.TigerType = TigerType.Error;
allOk = false;
}
else
if (this.ConditionNode.TigerType.Basetype != BaseType.Int)
{
report.AddError(this.Line, this.Column,
"Type mismatch: Invalid use of if condition with a non-int expression: '{0}' was found.",
this.ConditionNode.TigerType.Name);
this.TigerType = TigerType.Error;
allOk = false;
}
}
TigerType returnType = this.ThenExpressionNode.TigerType;
if (this.ElseExpressionNode != null)
{
this.ElseExpressionNode.CheckSemantics(scope, report);
allOk &= this.ElseExpressionNode.IsOk;
bool isThenAssignable =
this.ThenExpressionNode.TigerType.IsAssignableTo(this.ElseExpressionNode.TigerType);
returnType = isThenAssignable ? this.ElseExpressionNode.TigerType : this.ThenExpressionNode.TigerType;
/* facilita que se puede asignar record y nil, con independencia del orden en que aparezca */
if (!isThenAssignable && !this.ElseExpressionNode.TigerType.IsAssignableTo(this.ThenExpressionNode.TigerType))
{
report.AddError(this.Line, this.Column,
"Type mismatch: The then and else expression types of an if-then-else differ: " +
"'{0}' and '{1}' were found.",
this.ThenExpressionNode.TigerType.Name, this.ElseExpressionNode.TigerType.Name);
this.TigerType = TigerType.Error;
return;
}
}
else
{
if (this.ThenExpressionNode.TigerType.Basetype != BaseType.Void)
{
report.AddError(this.Line, this.Column,
"Type mismatch: The then expression at a if-then statement must not return a value: " +
"Found '{0}' whilst expecting void.",
this.ThenExpressionNode.TigerType.Name);
this.TigerType = TigerType.Error;
return;
}
}
this.TigerType = allOk ? returnType : TigerType.Error;
}
internal override void GenerateCode(ModuleBuilder moduleBuilder)
{
this.ConditionNode.GenerateCode(moduleBuilder);
this.ThenExpressionNode.GenerateCode(moduleBuilder);
if (this.ElseExpressionNode != null)
{
this.ElseExpressionNode.GenerateCode(moduleBuilder);
this.VmExpression = Expression.Condition(
Expression.NotEqual(this.ConditionNode.VmExpression, Expression.Constant(0)),
this.ThenExpressionNode.VmExpression,
this.ElseExpressionNode.VmExpression);
}
else
{
this.VmExpression = Expression.IfThen(
Expression.NotEqual(this.ConditionNode.VmExpression, Expression.Constant(0)),
this.ThenExpressionNode.VmExpression);
}
}
}
}