我们正在使用MdbgCore.dll来评估线程callstack上的参数的属性.
为此,我们正在执行一个功能.
不幸的是,我们所有尝试执行func-eval的尝试都失败了CORDBG_E_ILLEGAL_IN_OPTIMIZED_CODE,这似乎是由于用于func-eval的线程不在GC安全点.
这在此处记录:http://blogs.msdn.com/b/jmstall/archive/2005/11/15/funceval-rules.aspx.
我们尝试扫描进程中的所有线程以查找处于GC安全点的线程,但它们似乎都具有标记为USER_UNSAFE_POINT的UserState.
关于这个主题的文档非常稀缺,我们正在努力弄清楚是否有办法在GC安全点获取一个线程,以便我们可以执行功能.我们会考虑任何允许我们确定性地使用线程来执行函数的过程.
免责声明:我们正在尝试评估驻留在优化程序集中的类的方法,因此不确定这是否也可能导致问题.
示例代码如下:
if (argument.TypeName.EndsWith(
"WorkerRequest", StringComparison.OrdinalIgnoreCase)
&& !argument.IsNull)
{
try
{
// Invoke the "GetUriPath()" function to obtain the URI
string functionName = "System.Web.HttpWorkerRequest.GetUriPath";
MDbgFunction func = debugger.Processes.Active.ResolveFunctionNameFromScope(
functionName,
thread.CorThread.AppDomain
);
if (null == func)
{
throw new InvalidOperationException(
String.Format("Could not resolve {0}", functionName));
}
// Setup the eval
CorEval eval = threadForFuncEvals.CorThread.CreateEval();
// Setup the function parameters
List<CorValue> values = new List<CorValue>();
// Add the worker request "this" pointer
values.Add(
argument.CorValue
);
// resume the thread being used to do the func-eval
threadForFuncEvals.CorThread.DebugState = CorDebugThreadState.THREAD_RUN;
// Queue the function for execution
// EXCEPTION THROWN BELOW
// EXCEPTION THROWN BELOW
// EXCEPTION THROWN BELOW
eval.CallFunction(func.CorFunction, values.ToArray());
// BUGBUG: Should we pause all other threads to prevent them from moving?
// Continue the process to execute the function
if (!proc.Go().WaitOne(settings.BreakTimeout))
{
throw new InvalidOperationException("Timeout while evaluating function");
}
// get the returned string
var result = eval.Result;
if (result != null)
{
MDbgValue mv = new MDbgValue(proc, result);
string returnedValue = mv.GetStringValue(false);
threadInfo.Url = returnedValue;
}
}
catch (Exception e)
{
// BUGBUG: Ignoring exception
}
finally
{
// suspend the thread again
if (threadForFuncEvals != null)
{
threadForFuncEvals.CorThread.DebugState =
CorDebugThreadState.THREAD_SUSPEND;
}
}
}
Microsoft / Mdbg团队,您能帮忙吗?
最好,
麦克风
最佳答案 这与JIT优化有关吗?
在我的程序中,我关闭了JIT优化(出于技术原因,我认为你只能使用CreateProcess()而不使用Attach()).
proc = m_Debugger.CreateProcess(ProcessName, ProcessArgs, DebugModeFlag.Default, DebugEngineUtils.GetAssemblyRuntimeVersion(ProcessName,DefaultNetVersion));
if (proc!=null) proc.CorProcess.OnCreateProcess += new Microsoft.Samples.Debugging.CorDebug.CorProcessEventHandler(CorProcess_OnCreateProcess);
if (proc!=null) proc.CorProcess.OnModuleLoad += new Microsoft.Samples.Debugging.CorDebug.CorModuleEventHandler(CorProcess_OnModuleLoad);
void CorProcess_OnModuleLoad(object sender, Microsoft.Samples.Debugging.CorDebug.CorModuleEventArgs e)
{
e.Module.JITCompilerFlags = Microsoft.Samples.Debugging.CorDebug.CorDebugJITCompilerFlags.CORDEBUG_JIT_DISABLE_OPTIMIZATION;
}
void CorProcess_OnCreateProcess(object sender, Microsoft.Samples.Debugging.CorDebug.CorProcessEventArgs e)
{
//try to disable optimization
((Microsoft.Samples.Debugging.CorDebug.CorProcess)sender).DesiredNGENCompilerFlags = Microsoft.Samples.Debugging.CorDebug.CorDebugJITCompilerFlags.CORDEBUG_JIT_DISABLE_OPTIMIZATION;
}