From fca97d0ca72524b3bdd61817f7a172dd47d53287 Mon Sep 17 00:00:00 2001
From: Brian Robbins <brianrob@microsoft.com>
Date: Fri, 12 May 2017 10:51:31 -0700
Subject: EventPipe Circular Buffer Support and Ability to Start/Stop Tracing
 (#11507)

---
 src/vm/eventpipe.h | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 69 insertions(+), 2 deletions(-)

(limited to 'src/vm/eventpipe.h')

diff --git a/src/vm/eventpipe.h b/src/vm/eventpipe.h
index d5b85f7e3a..626c4dff53 100644
--- a/src/vm/eventpipe.h
+++ b/src/vm/eventpipe.h
@@ -15,6 +15,8 @@ class EventPipeConfiguration;
 class EventPipeEvent;
 class EventPipeFile;
 class EventPipeJsonFile;
+class EventPipeBuffer;
+class EventPipeBufferManager;
 class MethodDesc;
 class SampleProfilerEventInstance;
 
@@ -28,9 +30,11 @@ private:
     // Top of stack is at index 0.
     UINT_PTR m_stackFrames[MAX_STACK_DEPTH];
 
+#ifdef _DEBUG
     // Parallel array of MethodDesc pointers.
     // Used for debug-only stack printing.
     MethodDesc* m_methods[MAX_STACK_DEPTH];
+#endif // _DEBUG
 
     // The next available slot in StackFrames.
     unsigned int m_nextAvailableFrame;
@@ -44,6 +48,18 @@ public:
         Reset();
     }
 
+    void CopyTo(StackContents *pDest)
+    {
+        LIMITED_METHOD_CONTRACT;
+        _ASSERTE(pDest != NULL);
+
+        memcpy_s(pDest->m_stackFrames, MAX_STACK_DEPTH * sizeof(UINT_PTR), m_stackFrames, sizeof(UINT_PTR) * m_nextAvailableFrame);
+#ifdef _DEBUG
+        memcpy_s(pDest->m_methods, MAX_STACK_DEPTH * sizeof(MethodDesc*), m_methods, sizeof(MethodDesc*) * m_nextAvailableFrame);
+#endif
+        pDest->m_nextAvailableFrame = m_nextAvailableFrame;
+    }
+
     void Reset()
     {
         LIMITED_METHOD_CONTRACT;
@@ -78,6 +94,7 @@ public:
         return m_stackFrames[frameIndex];
     }
 
+#ifdef _DEBUG
     MethodDesc* GetMethod(unsigned int frameIndex)
     {
         LIMITED_METHOD_CONTRACT;
@@ -90,6 +107,7 @@ public:
 
         return m_methods[frameIndex];
     }
+#endif // _DEBUG
 
     void Append(UINT_PTR controlPC, MethodDesc *pMethod)
     {
@@ -98,7 +116,9 @@ public:
         if(m_nextAvailableFrame < MAX_STACK_DEPTH)
         {
             m_stackFrames[m_nextAvailableFrame] = controlPC;
+#ifdef _DEBUG
             m_methods[m_nextAvailableFrame] = pMethod;
+#endif
             m_nextAvailableFrame++;
         }
     }
@@ -124,6 +144,7 @@ class EventPipe
     friend class EventPipeConfiguration;
     friend class EventPipeFile;
     friend class EventPipeProvider;
+    friend class EventPipeBufferManager;
     friend class SampleProfiler;
 
     public:
@@ -138,7 +159,11 @@ class EventPipe
         static void EnableOnStartup();
 
         // Enable tracing via the event pipe.
-        static void Enable();
+        static void Enable(
+            LPCWSTR strOutputPath,
+            uint circularBufferSizeInMB,
+            EventPipeProviderConfiguration *pProviders,
+            int numProviders);
 
         // Disable tracing via the event pipe.
         static void Disable();
@@ -148,7 +173,7 @@ class EventPipe
         static void WriteEvent(EventPipeEvent &event, BYTE *pData, unsigned int length);
 
         // Write out a sample profile event.
-        static void WriteSampleProfileEvent(SampleProfilerEventInstance &instance);
+        static void WriteSampleProfileEvent(Thread *pSamplingThread, Thread *pTargetThread, StackContents &stackContents);
         
         // Get the managed call stack for the current thread.
         static bool WalkManagedStackForCurrentThread(StackContents &stackContents);
@@ -171,8 +196,42 @@ class EventPipe
         static CrstStatic s_configCrst;
         static bool s_tracingInitialized;
         static EventPipeConfiguration *s_pConfig;
+        static EventPipeBufferManager *s_pBufferManager;
         static EventPipeFile *s_pFile;
+#ifdef _DEBUG
+        static EventPipeFile *s_pSyncFile;
         static EventPipeJsonFile *s_pJsonFile;
+#endif // _DEBUG
+};
+
+struct EventPipeProviderConfiguration
+{
+
+private:
+
+    LPCWSTR m_pProviderName;
+    UINT64 m_keywords;
+    unsigned int m_loggingLevel;
+
+public:
+
+    LPCWSTR GetProviderName() const
+    {
+        LIMITED_METHOD_CONTRACT;
+        return m_pProviderName;
+    }
+
+    UINT64 GetKeywords() const
+    {
+        LIMITED_METHOD_CONTRACT;
+        return m_keywords;
+    }
+
+    unsigned int GetLevel() const
+    {
+        LIMITED_METHOD_CONTRACT;
+        return m_loggingLevel;
+    }
 };
 
 class EventPipeInternal
@@ -180,6 +239,14 @@ class EventPipeInternal
 
 public:
 
+    static void QCALLTYPE Enable(
+        __in_z LPCWSTR outputFile,
+        unsigned int circularBufferSizeInMB,
+        EventPipeProviderConfiguration *pProviders,
+        int numProviders);
+
+    static void QCALLTYPE Disable();
+
     static INT_PTR QCALLTYPE CreateProvider(
         GUID providerID,
         EventPipeCallback pCallbackFunc);
-- 
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