99 lines
2.6 KiB
C#
99 lines
2.6 KiB
C#
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//
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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 CodeIs: CodeConditionExpression
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{
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Type type;
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CodeExpression exp;
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public CodeIs (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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Type typeObj = exp.GetResultType ();
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if (type.IsAssignableFrom (typeObj)) {
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gen.Emit (OpCodes.Ldc_I4_1);
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return;
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}
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else if (!typeObj.IsAssignableFrom (type)) {
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gen.Emit (OpCodes.Ldc_I4_0);
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return;
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}
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exp.Generate (gen);
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gen.Emit (OpCodes.Isinst, type);
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gen.Emit (OpCodes.Ldnull);
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gen.Emit (OpCodes.Cgt_Un);
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}
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public override void GenerateForBranch (ILGenerator gen, Label label, bool branchCase)
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{
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Type typeObj = exp.GetResultType ();
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if (type.IsAssignableFrom (typeObj)) {
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if (branchCase)
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gen.Emit (OpCodes.Br, label);
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return;
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}
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else if (!typeObj.IsAssignableFrom (type)) {
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if (!branchCase)
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gen.Emit (OpCodes.Br, label);
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return;
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}
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exp.Generate (gen);
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gen.Emit (OpCodes.Isinst, type);
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if (branchCase)
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gen.Emit (OpCodes.Brtrue, label);
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else
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gen.Emit (OpCodes.Brfalse, label);
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}
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public override void PrintCode (CodeWriter cp)
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{
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exp.PrintCode (cp);
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cp.Write (" is ");
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cp.Write (type.FullName);
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}
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public override Type GetResultType ()
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{
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return typeof(bool);
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}
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}
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}
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#endif
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