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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
//
#if !FULL_AOT_RUNTIME
using System;
using System.Reflection;
using System.Reflection.Emit;
using Mono.CodeGeneration;
namespace Mono.CodeGeneration
{
public class CodeIs: CodeConditionExpression
{
Type type;
CodeExpression exp;
public CodeIs (Type type, CodeExpression exp)
{
this.type = type;
this.exp = exp;
}
public override void Generate (ILGenerator gen)
{
Type typeObj = exp.GetResultType ();
if (type.IsAssignableFrom (typeObj)) {
gen.Emit (OpCodes.Ldc_I4_1);
return;
}
else if (!typeObj.IsAssignableFrom (type)) {
gen.Emit (OpCodes.Ldc_I4_0);
return;
}
exp.Generate (gen);
gen.Emit (OpCodes.Isinst, type);
gen.Emit (OpCodes.Ldnull);
gen.Emit (OpCodes.Cgt_Un);
}
public override void GenerateForBranch (ILGenerator gen, Label label, bool branchCase)
{
Type typeObj = exp.GetResultType ();
if (type.IsAssignableFrom (typeObj)) {
if (branchCase)
gen.Emit (OpCodes.Br, label);
return;
}
else if (!typeObj.IsAssignableFrom (type)) {
if (!branchCase)
gen.Emit (OpCodes.Br, label);
return;
}
exp.Generate (gen);
gen.Emit (OpCodes.Isinst, type);
if (branchCase)
gen.Emit (OpCodes.Brtrue, label);
else
gen.Emit (OpCodes.Brfalse, label);
}
public override void PrintCode (CodeWriter cp)
{
exp.PrintCode (cp);
cp.Write (" is ");
cp.Write (type.FullName);
}
public override Type GetResultType ()
{
return typeof(bool);
}
}
}
#endif
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