我可以使用一个简洁的代码片段来进行JIT内联吗? [英] Can I have a concise code snippet that would incur JIT inlining please?

问题描述

我正在尝试生成一些"Hello World"大小的C#代码段，这些代码段会导致JIT内联.到目前为止，我有这个:

I'm trying to produce some "Hello World" size C# code snippet that would incur JIT inlining. So far I have this:

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine( GetAssembly().FullName );
        Console.ReadLine();
    }

    static Assembly GetAssembly()
    {
        return System.Reflection.Assembly.GetCallingAssembly();
    }
}

我在Visual Studio中将

编译为发布"-任何CPU"和无需调试即可运行".它显示了我的示例程序程序集的名称，因此很明显GetAssembly()没有内联到Main()中，否则它将显示mscorlib程序集名称.

which I compile as "Release"-"Any CPU" and "Run without debugging" from Visual Studio. It displays the name of my sample program assembly so clearly GetAssembly() is not inlined into Main(), otherwise it would display mscorlib assembly name.

如何编写一些会导致JIT内联的C#代码段?

How do I compose some C# code snippet that would incur JIT inlining?

推荐答案

当然，这是一个示例:

using System;

class Test
{
    static void Main()
    {
        CallThrow();
    }

    static void CallThrow()
    {
        Throw();
    }

    static void Throw()
    {
        // Add a condition to try to disuade the JIT
        // compiler from inlining *this* method. Could
        // do this with attributes...
        if (DateTime.Today.Year > 1000)
        {
            throw new Exception();
        }
    }
}

以类似发行版的方式进行编译:

Compile in a release-like mode:

csc /o+ /debug- Test.cs

运行:

c:\Users\Jon\Test>test

Unhandled Exception: System.Exception: Exception of type 'System.Exception' was
thrown.
   at Test.Throw()
   at Test.Main()

请注意堆栈跟踪-看起来Throw是直接由Main调用的，因为CallThrow的代码是内联的.

Note the stack trace - it looks as if Throw was called directly by Main, because the code for CallThrow was inlined.

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