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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 CodeCast: CodeExpression
{
Type type;
CodeExpression exp;
public CodeCast (Type type, CodeExpression exp)
{
this.type = type;
this.exp = exp;
}
public override void Generate (ILGenerator gen)
{
exp.Generate (gen);
Type typeObj = exp.GetResultType ();
if (type.IsAssignableFrom (typeObj)) {
if (typeObj.IsValueType)
gen.Emit (OpCodes.Box, typeObj);
return;
}
else if (type.IsValueType && typeObj == typeof(object)) {
// Unbox
gen.Emit (OpCodes.Unbox, type);
CodeGenerationHelper.LoadFromPtr (gen, type);
return;
}
else if (typeObj.IsAssignableFrom (type)) {
// Sub s = (Sub)base
gen.Emit (OpCodes.Castclass, type);
return;
}
else if (CodeGenerationHelper.IsNumber (type) && CodeGenerationHelper.IsNumber (typeObj)) {
switch (Type.GetTypeCode (type))
{
case TypeCode.Byte:
gen.Emit (OpCodes.Conv_U1);
return;
case TypeCode.Double:
gen.Emit (OpCodes.Conv_R8);
return;
case TypeCode.Int16:
gen.Emit (OpCodes.Conv_I2);
return;
case TypeCode.Int32:
gen.Emit (OpCodes.Conv_I4);
return;
case TypeCode.Int64:
gen.Emit (OpCodes.Conv_I8);
return;
case TypeCode.SByte:
gen.Emit (OpCodes.Conv_I1);
return;
case TypeCode.Single:
gen.Emit (OpCodes.Conv_R4);
return;
case TypeCode.UInt16:
gen.Emit (OpCodes.Conv_U2);
return;
case TypeCode.UInt32:
gen.Emit (OpCodes.Conv_U4);
return;
case TypeCode.UInt64:
gen.Emit (OpCodes.Conv_U8);
return;
}
}
MethodInfo imp = type.GetMethod ("op_Implicit", new Type[] { typeObj });
if (imp != null) {
gen.Emit (OpCodes.Call, imp);
return;
}
foreach (MethodInfo m in typeObj.GetMember ("op_Explicit"))
if (m.ReturnType == type) {
gen.Emit (OpCodes.Call, m);
return;
}
throw new InvalidOperationException ("Can't cast from " + typeObj + " to " + type);
}
public override void PrintCode (CodeWriter cp)
{
Type typeObj = exp.GetResultType ();
if (type.IsAssignableFrom (typeObj)) {
exp.PrintCode (cp);
return;
}
cp.Write ("((" + type.FullName + ") ");
exp.PrintCode (cp);
cp.Write (")");
}
public override Type GetResultType ()
{
return type;
}
}
}
#endif
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