136 lines
3.6 KiB
C#
136 lines
3.6 KiB
C#
//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (C) Lluis Sanchez Gual, 2004
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//
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#if !FULL_AOT_RUNTIME
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using System;
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using System.Reflection;
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using System.Reflection.Emit;
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using Mono.CodeGeneration;
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namespace Mono.CodeGeneration
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{
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public class CodeCast: CodeExpression
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{
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Type type;
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CodeExpression exp;
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public CodeCast (Type type, CodeExpression exp)
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{
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this.type = type;
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this.exp = exp;
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}
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public override void Generate (ILGenerator gen)
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{
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exp.Generate (gen);
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Type typeObj = exp.GetResultType ();
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if (type.IsAssignableFrom (typeObj)) {
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if (typeObj.IsValueType)
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gen.Emit (OpCodes.Box, typeObj);
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return;
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}
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else if (type.IsValueType && typeObj == typeof(object)) {
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// Unbox
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gen.Emit (OpCodes.Unbox, type);
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CodeGenerationHelper.LoadFromPtr (gen, type);
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return;
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}
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else if (typeObj.IsAssignableFrom (type)) {
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// Sub s = (Sub)base
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gen.Emit (OpCodes.Castclass, type);
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return;
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}
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else if (CodeGenerationHelper.IsNumber (type) && CodeGenerationHelper.IsNumber (typeObj)) {
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switch (Type.GetTypeCode (type))
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{
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case TypeCode.Byte:
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gen.Emit (OpCodes.Conv_U1);
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return;
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case TypeCode.Double:
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gen.Emit (OpCodes.Conv_R8);
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return;
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case TypeCode.Int16:
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gen.Emit (OpCodes.Conv_I2);
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return;
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case TypeCode.Int32:
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gen.Emit (OpCodes.Conv_I4);
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return;
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case TypeCode.Int64:
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gen.Emit (OpCodes.Conv_I8);
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return;
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case TypeCode.SByte:
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gen.Emit (OpCodes.Conv_I1);
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return;
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case TypeCode.Single:
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gen.Emit (OpCodes.Conv_R4);
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return;
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case TypeCode.UInt16:
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gen.Emit (OpCodes.Conv_U2);
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return;
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case TypeCode.UInt32:
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gen.Emit (OpCodes.Conv_U4);
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return;
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case TypeCode.UInt64:
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gen.Emit (OpCodes.Conv_U8);
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return;
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}
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}
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MethodInfo imp = type.GetMethod ("op_Implicit", new Type[] { typeObj });
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if (imp != null) {
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gen.Emit (OpCodes.Call, imp);
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return;
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}
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foreach (MethodInfo m in typeObj.GetMember ("op_Explicit"))
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if (m.ReturnType == type) {
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gen.Emit (OpCodes.Call, m);
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return;
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}
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throw new InvalidOperationException ("Can't cast from " + typeObj + " to " + type);
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}
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public override void PrintCode (CodeWriter cp)
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{
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Type typeObj = exp.GetResultType ();
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if (type.IsAssignableFrom (typeObj)) {
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exp.PrintCode (cp);
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return;
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}
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cp.Write ("((" + type.FullName + ") ");
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exp.PrintCode (cp);
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cp.Write (")");
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}
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public override Type GetResultType ()
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{
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return type;
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}
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}
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}
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#endif
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