89 lines
2.8 KiB
C#
89 lines
2.8 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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namespace Mono.CodeGeneration
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{
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public class CodeWhen: CodeExpression
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{
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CodeExpression condition;
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CodeExpression trueBlock;
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CodeExpression falseBlock;
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public CodeWhen (CodeExpression condition, CodeExpression trueResult, CodeExpression falseResult)
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{
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this.condition = condition;
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if (condition.GetResultType () != typeof(bool))
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throw new InvalidOperationException ("Condition expression is not boolean");
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if (trueResult.GetResultType() != falseResult.GetResultType())
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throw new InvalidOperationException ("The types of the true and false expressions must be the same");
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trueBlock = trueResult;
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falseBlock = falseResult;
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}
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public override void Generate (ILGenerator gen)
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{
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Label falseLabel = gen.DefineLabel ();
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Label endLabel = gen.DefineLabel ();
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GenerateCondition (gen, falseLabel);
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trueBlock.Generate (gen);
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gen.Emit (OpCodes.Br, endLabel);
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gen.MarkLabel(falseLabel);
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falseBlock.Generate (gen);
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gen.MarkLabel(endLabel);
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}
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void GenerateCondition (ILGenerator gen, Label falseLabel)
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{
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if (condition is CodeConditionExpression)
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((CodeConditionExpression)condition).GenerateForBranch (gen, falseLabel, false);
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else {
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condition.Generate (gen);
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gen.Emit (OpCodes.Brfalse, falseLabel);
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}
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}
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public override void PrintCode (CodeWriter cp)
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{
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cp.Write ("(");
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condition.PrintCode (cp);
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cp.Write (") ? ");
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trueBlock.PrintCode (cp);
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cp.Write (" : ");
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falseBlock.PrintCode (cp);
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}
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public override Type GetResultType ()
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{
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return trueBlock.GetResultType();
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}
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}
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}
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#endif
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