diff --git a/llvm/lib/CodeGen/StackMaps.cpp b/llvm/lib/CodeGen/StackMaps.cpp
index 9e6fc3e..9b7dd40 100644
--- a/llvm/lib/CodeGen/StackMaps.cpp
+++ b/llvm/lib/CodeGen/StackMaps.cpp
@@ -30,8 +30,8 @@
 #define DEBUG_TYPE "stackmaps"
 
 static cl::opt<int> StackMapVersion(
-    "stackmap-version", cl::init(1),
-    cl::desc("Specify the stackmap encoding version (default = 1)"));
+    "stackmap-version", cl::init(2),
+    cl::desc("Specify the stackmap encoding version (default = 2)"));
 
 const char *StackMaps::WSMP = "Stack Maps: ";
 
@@ -74,7 +74,7 @@
 }
 
 StackMaps::StackMaps(AsmPrinter &AP) : AP(AP) {
-  if (StackMapVersion != 1)
+  if (StackMapVersion != 2)
     llvm_unreachable("Unsupported stackmap version!");
 }
 
@@ -335,13 +335,18 @@
   CSInfos.emplace_back(CSOffsetExpr, ID, std::move(Locations),
                        std::move(LiveOuts));
 
-  // Record the stack size of the current function.
+  // Record the stack size of the current function and update callsite count.
   const MachineFrameInfo &MFI = AP.MF->getFrameInfo();
   const TargetRegisterInfo *RegInfo = AP.MF->getSubtarget().getRegisterInfo();
   bool HasDynamicFrameSize =
       MFI.hasVarSizedObjects() || RegInfo->needsStackRealignment(*(AP.MF));
-  FnStackSize[AP.CurrentFnSym] =
-      HasDynamicFrameSize ? UINT64_MAX : MFI.getStackSize();
+  uint64_t FrameSize = HasDynamicFrameSize ? UINT64_MAX : MFI.getStackSize();
+
+  auto CurrentIt = FnInfos.find(AP.CurrentFnSym);
+  if (CurrentIt != FnInfos.end())
+    CurrentIt->second.RecordCount++;
+  else
+    FnInfos.insert(std::make_pair(AP.CurrentFnSym, FunctionInfo(FrameSize)));
 }
 
 void StackMaps::recordStackMap(const MachineInstr &MI) {
@@ -387,7 +392,7 @@
 /// Emit the stackmap header.
 ///
 /// Header {
-///   uint8  : Stack Map Version (currently 1)
+///   uint8  : Stack Map Version (currently 2)
 ///   uint8  : Reserved (expected to be 0)
 ///   uint16 : Reserved (expected to be 0)
 /// }
@@ -401,8 +406,8 @@
   OS.EmitIntValue(0, 2);               // Reserved.
 
   // Num functions.
-  DEBUG(dbgs() << WSMP << "#functions = " << FnStackSize.size() << '\n');
-  OS.EmitIntValue(FnStackSize.size(), 4);
+  DEBUG(dbgs() << WSMP << "#functions = " << FnInfos.size() << '\n');
+  OS.EmitIntValue(FnInfos.size(), 4);
   // Num constants.
   DEBUG(dbgs() << WSMP << "#constants = " << ConstPool.size() << '\n');
   OS.EmitIntValue(ConstPool.size(), 4);
@@ -416,15 +421,18 @@
 /// StkSizeRecord[NumFunctions] {
 ///   uint64 : Function Address
 ///   uint64 : Stack Size
+///   uint64 : Record Count
 /// }
 void StackMaps::emitFunctionFrameRecords(MCStreamer &OS) {
   // Function Frame records.
   DEBUG(dbgs() << WSMP << "functions:\n");
-  for (auto const &FR : FnStackSize) {
+  for (auto const &FR : FnInfos) {
     DEBUG(dbgs() << WSMP << "function addr: " << FR.first
-                 << " frame size: " << FR.second);
+                 << " frame size: " << FR.second.StackSize
+                 << " callsite count: " << FR.second.RecordCount << '\n');
     OS.EmitSymbolValue(FR.first, 8);
-    OS.EmitIntValue(FR.second, 8);
+    OS.EmitIntValue(FR.second.StackSize, 8);
+    OS.EmitIntValue(FR.second.RecordCount, 8);
   }
 }
 
@@ -525,7 +533,7 @@
   // Bail out if there's no stack map data.
   assert((!CSInfos.empty() || ConstPool.empty()) &&
          "Expected empty constant pool too!");
-  assert((!CSInfos.empty() || FnStackSize.empty()) &&
+  assert((!CSInfos.empty() || FnInfos.empty()) &&
          "Expected empty function record too!");
   if (CSInfos.empty())
     return;