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Copy pathLazyCode.cs
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86 lines (73 loc) · 2.71 KB
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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* [email protected]. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Diagnostics;
using System.Reflection;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
#if FEATURE_CORE_DLR
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using System.Threading;
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
}
}