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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "common.h"
#include "eventpipe.h"
#include "eventpipejsonfile.h"
#include "sampleprofiler.h"
CrstStatic EventPipe::s_initCrst;
bool EventPipe::s_tracingInitialized = false;
bool EventPipe::s_tracingEnabled = false;
EventPipeJsonFile* EventPipe::s_pJsonFile = NULL;
void EventPipe::Initialize()
{
STANDARD_VM_CONTRACT;
s_tracingInitialized = s_initCrst.InitNoThrow(
CrstEventPipe,
(CrstFlags)(CRST_TAKEN_DURING_SHUTDOWN));
}
void EventPipe::EnableOnStartup()
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
// Test COMPLUS variable to enable tracing at start-up.
if(CLRConfig::GetConfigValue(CLRConfig::INTERNAL_PerformanceTracing) != 0)
{
Enable();
}
}
void EventPipe::Shutdown()
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
Disable();
}
void EventPipe::Enable()
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
if(!s_tracingInitialized)
{
return;
}
// Take the lock and enable tracing.
CrstHolder _crst(&s_initCrst);
s_tracingEnabled = true;
if(CLRConfig::GetConfigValue(CLRConfig::INTERNAL_PerformanceTracing) == 2)
{
// File placed in current working directory.
SString outputFilePath;
outputFilePath.Printf("Process-%d.PerfView.json", GetCurrentProcessId());
s_pJsonFile = new EventPipeJsonFile(outputFilePath);
}
SampleProfiler::Enable();
}
void EventPipe::Disable()
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
CrstHolder _crst(&s_initCrst);
s_tracingEnabled = false;
SampleProfiler::Disable();
if(s_pJsonFile != NULL)
{
delete(s_pJsonFile);
s_pJsonFile = NULL;
}
}
bool EventPipe::EventEnabled(GUID& providerID, INT64 keyword)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
// TODO: Implement filtering.
return false;
}
void EventPipe::WriteEvent(GUID& providerID, INT64 eventID, BYTE *pData, size_t length, bool sampleStack)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
StackContents stackContents;
bool stackWalkSucceeded;
if(sampleStack)
{
stackWalkSucceeded = WalkManagedStackForCurrentThread(stackContents);
}
// TODO: Write the event.
}
void EventPipe::WriteSampleProfileEvent(Thread *pThread, StackContents &stackContents)
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_PREEMPTIVE;
PRECONDITION(pThread != NULL);
}
CONTRACTL_END;
EX_TRY
{
if(s_pJsonFile != NULL)
{
CommonEventFields eventFields;
QueryPerformanceCounter(&eventFields.TimeStamp);
eventFields.ThreadID = pThread->GetOSThreadId();
static SString message(W("THREAD_TIME"));
s_pJsonFile->WriteEvent(eventFields, message, stackContents);
}
}
EX_CATCH{} EX_END_CATCH(SwallowAllExceptions);
}
bool EventPipe::WalkManagedStackForCurrentThread(StackContents &stackContents)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
Thread *pThread = GetThread();
_ASSERTE(pThread != NULL);
return WalkManagedStackForThread(pThread, stackContents);
}
bool EventPipe::WalkManagedStackForThread(Thread *pThread, StackContents &stackContents)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(pThread != NULL);
}
CONTRACTL_END;
stackContents.Reset();
StackWalkAction swaRet = pThread->StackWalkFrames(
(PSTACKWALKFRAMESCALLBACK) &StackWalkCallback,
&stackContents,
ALLOW_ASYNC_STACK_WALK | FUNCTIONSONLY | HANDLESKIPPEDFRAMES);
return ((swaRet == SWA_DONE) || (swaRet == SWA_CONTINUE));
}
StackWalkAction EventPipe::StackWalkCallback(CrawlFrame *pCf, StackContents *pData)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
PRECONDITION(pCf != NULL);
PRECONDITION(pData != NULL);
}
CONTRACTL_END;
// Get the IP.
UINT_PTR controlPC = (UINT_PTR)pCf->GetRegisterSet()->ControlPC;
if(controlPC == 0)
{
if(pData->GetLength() == 0)
{
// This happens for pinvoke stubs on the top of the stack.
return SWA_CONTINUE;
}
}
_ASSERTE(controlPC != 0);
// Add the IP to the captured stack.
pData->Append(
controlPC,
pCf->GetFunction()
);
// Continue the stack walk.
return SWA_CONTINUE;
}
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