report different kinds of OOM

lib/Common/Exceptions/ReportError.cpp

@@ -157,4 +157,20 @@ _NOINLINE void MemGCSingleAllocationLimit_unrecoverable_error()
     ReportFatalException(NULL, E_OUTOFMEMORY, Fatal_OutOfMemory, scenario);
 }
 
+// same as OutOfMemory_unrecoverable_error, but with a different `scenario`
+// - just to cause separate bucketing of these failures 
+_NOINLINE void OutOfMemoryTooManyPinnedObjects_unrecoverable_error()
+{
+    int scenario = 12;
+    ReportFatalException(NULL, E_OUTOFMEMORY, Fatal_OutOfMemory, scenario);
+}
+
+// same as OutOfMemory_unrecoverable_error, but with a different `scenario`
+// - just to cause separate bucketing of these failures 
+_NOINLINE void OutOfMemoryTooManyClosedContexts_unrecoverable_error()
+{
+    int scenario = 13;
+    ReportFatalException(NULL, E_OUTOFMEMORY, Fatal_OutOfMemory, scenario);
+}
+
 #pragma optimize("",on)

lib/Common/Exceptions/ReportError.h

@@ -76,6 +76,8 @@ void RpcFailure_unrecoverable_error(HRESULT hr);
 void OutOfMemory_unrecoverable_error();
 void RecyclerSingleAllocationLimit_unrecoverable_error();
 void MemGCSingleAllocationLimit_unrecoverable_error();
+void OutOfMemoryTooManyPinnedObjects_unrecoverable_error();
+void OutOfMemoryTooManyClosedContexts_unrecoverable_error();
 
 #ifndef DISABLE_SEH
 // RtlReportException is available on Vista and up, but we cannot use it for OOB release.

lib/Common/Memory/Recycler.h

@@ -1146,6 +1146,8 @@ public:
 #ifdef NTBUILD
     void SetTelemetryBlock(RecyclerWatsonTelemetryBlock * telemetryBlock) { this->telemetryBlock = telemetryBlock; }
 #endif
+    
+    uint GetPinnedObjectCount() const { return this->pinnedObjectMap.Count(); }
 
     void Prime();
     void* GetOwnerContext() { return (void*) this->collectionWrapper; }

lib/Runtime/Base/ScriptContext.cpp

@@ -569,6 +569,9 @@ namespace Js
         }
 #endif
 
+        Assert(this->IsActuallyClosed());
+        this->GetThreadContext()->closedScriptContextCount--;
+
         PERF_COUNTER_DEC(Basic, ScriptContext);
     }
 
@@ -617,6 +620,7 @@ namespace Js
     void ScriptContext::InternalClose()
     {
         isScriptContextActuallyClosed = true;
+        this->GetThreadContext()->closedScriptContextCount++;
 
         PERF_COUNTER_DEC(Basic, ScriptContextActive);
 

lib/Runtime/Base/ThreadContext.h

@@ -622,7 +622,7 @@ private:
     bool reentrancySafeOrHandled;
     bool isInReentrancySafeRegion;
 
-    AllocationPolicyManager * allocationPolicyManager;
+    AllocationPolicyManager * allocationPolicyManager; 
 
     JsUtil::ThreadService threadService;
 #if ENABLE_NATIVE_CODEGEN
@@ -856,6 +856,11 @@ public:
 
     AllocationPolicyManager * GetAllocationPolicyManager() { return allocationPolicyManager; }
 
+    // used for diagnosing abnormally high number of closed, but still formally reachable script contexts
+    // at the time of failfast due to allocation limits.
+    // high number may indicate that context leaks have occured.
+    uint closedScriptContextCount;
+
 #if ENABLE_NATIVE_CODEGEN
     PreReservedVirtualAllocWrapper * GetPreReservedVirtualAllocator() { return &preReservedVirtualAllocator; }
 #if DYNAMIC_INTERPRETER_THUNK || defined(ASMJS_PLAT)