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LazyCode.cs
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61 lines (50 loc) · 1.95 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System.Linq.Expressions;
using Microsoft.Scripting.Runtime;
namespace IronPython.Compiler {
/// <summary>
/// Represents code which can be lazily compiled.
///
/// The code is created in an AST which provides the Expression of T and
/// whether or not the code should be interpreted. For non-pre compiled
/// scenarios the code will not be compiled until the 1st time it is run.
///
/// For pre-compiled scenarios the code is IExpressionSerializable and will
/// turn into a normal pre-compiled method.
/// </summary>
internal sealed class LazyCode<T> : IExpressionSerializable where T : class {
public Expression<T> Code;
private T Delegate;
private readonly bool _shouldInterpret;
private readonly int _compilationThreshold;
public LazyCode(Expression<T> code, bool shouldInterpret, int compilationThreshold) {
Code = code;
_shouldInterpret = shouldInterpret;
_compilationThreshold = compilationThreshold;
}
public T EnsureDelegate() {
if (Delegate == null) {
lock (this) {
if (Delegate == null) {
Delegate = Compile();
Code = null;
}
}
}
return Delegate;
}
private T Compile() {
if (_shouldInterpret) {
return (T)(object)Microsoft.Scripting.Generation.CompilerHelpers.LightCompile(Code, _compilationThreshold);
}
return Code.Compile();
}
#region IExpressionSerializable Members
public Expression CreateExpression() {
return Code;
}
#endregion
}
}