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//
// 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.
//
// Copyright (C) Lluis Sanchez Gual, 2004
//
using System;
using System.Reflection;
using System.Reflection.Emit;
namespace Mono.CodeGeneration
{
public class CodeWhile: CodeStatement
{
CodeExpression condition;
CodeBlock whileBlock;
public CodeWhile (CodeExpression condition)
{
this.condition = condition;
if (condition.GetResultType () != typeof(bool))
throw new InvalidOperationException ("Condition expression is not boolean");
}
public override void Generate (ILGenerator gen)
{
Label startLabel = gen.DefineLabel ();
Label checkLabel = gen.DefineLabel ();
gen.Emit (OpCodes.Br, checkLabel);
gen.MarkLabel(startLabel);
whileBlock.Generate (gen);
gen.MarkLabel(checkLabel);
if (condition is CodeConditionExpression)
((CodeConditionExpression)condition).GenerateForBranch (gen, startLabel, true);
else {
condition.Generate (gen);
gen.Emit (OpCodes.Brtrue, startLabel);
}
}
public override void PrintCode (CodeWriter cp)
{
cp.Write ("while (");
condition.PrintCode (cp);
cp.Write (") {");
cp.EndLine ();
cp.Indent ();
whileBlock.PrintCode (cp);
cp.Unindent ();
cp.BeginLine ().Write ("}");
}
public CodeBlock WhileBlock
{
get { return whileBlock; }
set { whileBlock = value; }
}
}
}
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