Roslyn脚本：运行时异常的行号信息 [英] Roslyn scripting: Line number information for run time exceptions
问题描述
Microsoft.CodeAnalysis.CSharp.Scripting nuget包），我想知道是否有一种方法来添加行数字信息到堆栈跟踪，用于在脚本中发生的异常。 当我运行以下C＃代码：
// using Microsoft.CodeAnalysis.CSharp.Scripting;
var code = @
var a = 0;
var b = 1 / a;
;
try
{
等待CSharpScript.RunAsync（code）;
}
catch（DivideByZeroException dbze）
{
Console.WriteLine（dbze.StackTrace）;
}
写入控制台的堆栈跟踪是：
在提交＃0。<< Initialize>> d__0.MoveNext（）
---从上一个位置结束堆栈跟踪异常被抛出---
在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
在Microsoft.CodeAnalysis .Scripting.ScriptExecutionState。< RunSubmissionsAsync> d__9`1.MoveNext（）
---从抛出异常的前一个位置的堆栈跟踪结束---
在System.Runtime.CompilerServices.TaskAwaiter。 ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
在Microsoft.CodeAnalysis.Scripting.Script`1。< RunSubmissionsAsync> d__21.MoveNext（）
---从前一个位置的堆栈跟踪结束，异常发生wn ---
在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
在System.Runtime.CompilerServices .TaskAwaiter`1.GetResult（）
在UnitTests.ExploreRoslyn。< ScriptWithRuntimeError> d__4.MoveNext（）在D：\dev\misc\\\
etmockery\UnitTests\ExploreRoslyn.cs：line 47
请注意，如果我尝试在脚本中捕获异常，结果是类似的：
var code = @
try {
var a = 0;
var b = 1 / a;
}
catch（System.DivideByZeroException dbze）
{
Console.WriteLine（dbze.StackTrace）;
}
;
等待CSharpScript.RunAsync（代码）;
输出：
在提交＃0。<< Initialize>> d__0.MoveNext（）
到控制台。
有没有办法在编译/执行脚本时，使Roslyn脚本引擎添加调试信息，所以我可以在堆栈跟踪中获取行号信息。
p>我有一些工作通过发出一个（内存）程序集的调试信息。
示例代码：
var code = @
var a = 0;
var b = 1 / a;
;
var script = CSharpScript.Create（code）;
var compilation = script.GetCompilation（）;
var ilstream = new MemoryStream（）;
var pdbstream = new MemoryStream（）;
compilation.Emit（ilstream，pdbstream）;
var assembly = Assembly.Load（ilstream.GetBuffer（），pdbstream.GetBuffer（） ）;
var type = assembly.GetType（Submission＃0）;
var factory = type.GetMethod（< Factory>）;
var submissionArray = new object [2 ];
任务< object> task =（Task< object>）factory.Invoke（null，new object [] {submissionArray}）;
try
{
等待任务;
}
catch（DivideByZeroException dbze）
{
Console.WriteLine（dbze.StackTrace）;
}
输出是（注意堆栈跟踪中的：行3 ）：
在提交＃0。<< Initialize>> d__0.MoveNext（）in：line 3
- - 从抛出异常的前一个位置的堆栈跟踪结束 - -
在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
在System.Runtime.CompilerServices.TaskAwaiter `1.GetResult（）
在UnitTests.ExploreRoslyn。< ExploreEmittingAssembly> d__13.MoveNext（）在D：\dev\misc\\\
etmockery\UnitTests\ExploreRoslyn.cs：行151
现在显然这是一个黑客，对于硬编码的脚本引擎实现细节我并不满意（提交＃0 ，< Factory> ），另外我不知道我在做什么。应该有（也许有吗？）更好的方法。
更新
创建的问题 https://github.com/dotnet/roslyn/issues/13482 在Roslyn问题追踪器中。 / p>
I am messing around with the Roslyn scripting stuff (using the Microsoft.CodeAnalysis.CSharp.Scripting nuget package), and I wonder if there is a way to add line number information to the stack traces for exceptions that happen inside a script.
When I run the following C# code:
// using Microsoft.CodeAnalysis.CSharp.Scripting;
var code = @"
var a = 0;
var b = 1 / a;
";
try
{
await CSharpScript.RunAsync(code);
}
catch (DivideByZeroException dbze)
{
Console.WriteLine(dbze.StackTrace);
}
The stack trace written to the console is:
at Submission#0.<<Initialize>>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.CodeAnalysis.Scripting.ScriptExecutionState.<RunSubmissionsAsync>d__9`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.CodeAnalysis.Scripting.Script`1.<RunSubmissionsAsync>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at UnitTests.ExploreRoslyn.<ScriptWithRuntimeError>d__4.MoveNext() in D:\dev\misc\netmockery\UnitTests\ExploreRoslyn.cs:line 47
Note that if I try to catch the exception inside the script, the result is similar:
var code = @"
try {
var a = 0;
var b = 1 / a;
}
catch (System.DivideByZeroException dbze)
{
Console.WriteLine(dbze.StackTrace);
}
";
await CSharpScript.RunAsync(code);
This outputs:
at Submission#0.<<Initialize>>d__0.MoveNext()
To the console.
Is there a way to make the Roslyn scripting engine add debug information when compiling/executing the script, so I can get line number information in the stack trace?
I got something working by emitting an (in-memory) assembly with debug information.
Example code:
var code = @"
var a = 0;
var b = 1 / a;
";
var script = CSharpScript.Create(code);
var compilation = script.GetCompilation();
var ilstream = new MemoryStream();
var pdbstream = new MemoryStream();
compilation.Emit(ilstream, pdbstream);
var assembly = Assembly.Load(ilstream.GetBuffer(), pdbstream.GetBuffer());
var type = assembly.GetType("Submission#0");
var factory = type.GetMethod("<Factory>");
var submissionArray = new object[2];
Task<object> task = (Task<object>)factory.Invoke(null, new object[] { submissionArray });
try
{
await task;
}
catch (DivideByZeroException dbze)
{
Console.WriteLine(dbze.StackTrace);
}
The output is (notice the :line 3 in the stack trace):
at Submission#0.<<Initialize>>d__0.MoveNext() in :line 3
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at UnitTests.ExploreRoslyn.<ExploreEmittingAssembly>d__13.MoveNext() in D:\dev\misc\netmockery\UnitTests\ExploreRoslyn.cs:line 151
Now obviously this is a bit of a hack, and I'm not really happy with the hardcoded script engine implementation details (Submission#0, <Factory>), plus I don't really know what I'm doing. There should be (and maybe there is?) a better way.
Update
Created issue https://github.com/dotnet/roslyn/issues/13482 in the Roslyn issue tracker.
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