diff --git a/utils/llvm.natvis b/utils/llvm.natvis
new file mode 100644
index 00000000000..6b4ef83c67e
--- /dev/null
+++ b/utils/llvm.natvis
@@ -0,0 +1,181 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Visual Studio 2012 Native Debugging Visualizers for LLVM
+
+Put this file into "%USERPROFILE%\Documents\Visual Studio 2012\Visualizers"
+or create a symbolic link so it updates automatically.
+-->
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+  <Type Name="llvm::SmallVector&lt;*,*&gt;">
+    <DisplayString Condition="(($T1*)EndX - ($T1*)BeginX) == 0">empty</DisplayString>
+    <DisplayString Condition="(($T1*)EndX - ($T1*)BeginX) != 0">{{ size={($T1*)EndX - ($T1*)BeginX} }}</DisplayString>
+    <Expand>
+      <Item Name="[size]">($T1*)EndX - ($T1*)BeginX</Item>
+      <Item Name="[capacity]">($T1*)CapacityX - ($T1*)BeginX</Item>
+      <ArrayItems>
+        <Size>($T1*)EndX - ($T1*)BeginX</Size>
+        <ValuePointer>($T1*)BeginX</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::SmallVectorImpl&lt;*&gt;">
+    <DisplayString Condition="(($T1*)EndX - ($T1*)BeginX) == 0">empty</DisplayString>
+    <DisplayString Condition="(($T1*)EndX - ($T1*)BeginX) != 0">[{($T1*)EndX - ($T1*)BeginX}]</DisplayString>
+    <Expand>
+      <Item Name="[size]">($T1*)EndX - ($T1*)BeginX</Item>
+      <Item Name="[capacity]">($T1*)CapacityX - ($T1*)BeginX</Item>
+      <ArrayItems>
+        <Size>($T1*)EndX - ($T1*)BeginX</Size>
+        <ValuePointer>($T1*)BeginX</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::SmallString&lt;*&gt;">
+    <DisplayString>{BeginX,s}</DisplayString>
+    <StringView>BeginX,s</StringView>
+    <Expand>
+      <Item Name="[size]">(char*)EndX - (char*)BeginX</Item>
+      <Item Name="[capacity]">(char*)CapacityX - (char*)BeginX</Item>
+      <ArrayItems>
+        <Size>(char*)EndX - (char*)BeginX</Size>
+        <ValuePointer>(char*)BeginX</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::StringRef">
+    <DisplayString>[{Length}] {Data,s}</DisplayString>
+    <StringView>Data,s</StringView>
+    <Expand>
+      <Item Name="[length]">Length</Item>
+      <ArrayItems>
+        <Size>Length</Size>
+        <ValuePointer>Data</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::PointerIntPair&lt;*,*,*,*&gt;">
+    <DisplayString>{Value &amp; PointerBitMask} [{(Value &gt;&gt; IntShift) &amp; IntMask}]</DisplayString>
+    <Expand>
+      <Item Name="[ptr]">Value &amp; PointerBitMask</Item>
+      <Item Name="[int]">(Value &gt;&gt; IntShift) &amp; IntMask</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::PointerUnion&lt;*,*&gt;">
+    <DisplayString Condition="((Val.Value &gt;&gt; Val.IntShift) &amp; Val.IntMask) == 0">[P1] {($T1)(Val.Value &amp; Val.PointerBitMask)}</DisplayString>
+    <DisplayString Condition="((Val.Value &gt;&gt; Val.IntShift) &amp; Val.IntMask) != 0">[P2] {($T2)(Val.Value &amp; Val.PointerBitMask)}</DisplayString>
+    <Expand>
+      <Item Name="[ptr]" Condition="((Val.Value &gt;&gt; Val.IntShift) &amp; Val.IntMask) == 0">($T1)(Val.Value &amp; Val.PointerBitMask)</Item>
+      <Item Name="[ptr]" Condition="((Val.Value &gt;&gt; Val.IntShift) &amp; Val.IntMask) != 0">($T2)(Val.Value &amp; Val.PointerBitMask)</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::PointerUnion3&lt;*,*,*&gt;">
+    <DisplayString Condition="(Val.Val.Value &amp; 2) != 2 &amp;&amp; (Val.Val.Value &amp; 1) != 1">[P1] {($T1)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString Condition="(Val.Val.Value &amp; 2) == 2">[P2] {($T2)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString Condition="(Val.Val.Value &amp; 1) == 1">[P3] {($T3)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <Expand>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 2) != 2 &amp;&amp; (Val.Val.Value &amp; 1) != 1">($T1)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 2) == 2">($T2)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 1) == 1">($T3)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::PointerUnion4&lt;*,*,*,*&gt;">
+    <DisplayString Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 2) != 2 &amp;&amp; (Val.Val.Value &amp; 1) != 1">[P1] {($T1)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 2) == 2">[P2] {($T2)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 1) == 1">[P3] {($T3)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString Condition="(Val.Val.Value &amp; 3) == 3">[P4] {($T4)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <Expand>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 2) != 2 &amp;&amp; (Val.Val.Value &amp; 1) != 1">($T1)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 2) == 2">($T2)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 3) != 3 &amp;&amp; (Val.Val.Value &amp; 1) == 1">($T3)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+      <Item Name="[ptr]" Condition="(Val.Val.Value &amp; 3) == 3">($T4)((Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::iplist&lt;*,*&gt;">
+    <DisplayString Condition="Head == 0">{{ empty }}</DisplayString>
+    <DisplayString Condition="Head != 0">{{ head={Head} }}</DisplayString>
+    <Expand>
+      <LinkedListItems>
+        <HeadPointer>Head</HeadPointer>
+        <NextPointer>Next</NextPointer>
+        <ValueNode>this</ValueNode>
+      </LinkedListItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::IntrusiveRefCntPtr&lt;*&gt;">
+    <DisplayString Condition="Obj == 0">empty</DisplayString>
+    <DisplayString Condition="(Obj != 0) &amp;&amp; (Obj-&gt;ref_cnt == 1)">RefPtr [1 ref] {*Obj}</DisplayString>
+    <DisplayString Condition="(Obj != 0) &amp;&amp; (Obj-&gt;ref_cnt != 1)">RefPtr [{Obj-&gt;ref_cnt} refs] {*Obj}</DisplayString>
+    <Expand>
+      <Item Condition="Obj != 0" Name="[refs]">Obj-&gt;ref_cnt</Item>
+      <Item Condition="Obj != 0" Name="[ptr]">Obj</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::OwningPtr&lt;*&gt;">
+    <DisplayString Condition="Ptr == 0">empty</DisplayString>
+    <DisplayString Condition="Ptr != 0">OwningPtr {*Ptr}</DisplayString>
+    <Expand>
+      <Item Condition="Ptr != 0" Name="[ptr]">Ptr</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::SmallPtrSet&lt;*,*&gt;">
+    <DisplayString Condition="CurArray == SmallArray">{{ [Small Mode] elements={NumElements}, arraySize={CurArraySize} }}</DisplayString>
+    <DisplayString Condition="CurArray != SmallArray">{{ [Big Mode] elements={NumElements}, arraySize={CurArraySize} }}</DisplayString>
+    <Expand>
+      <Item Name="[NumElements]">NumElements</Item>
+      <Item Name="[CurArraySize]">CurArraySize</Item>
+      <IndexListItems>
+        <Size>CurArraySize + 1</Size>
+        <ValueNode>($T1*)&amp;CurArray[$i]</ValueNode>
+      </IndexListItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::DenseMap&lt;*,*,*&gt;">
+    <DisplayString Condition="NumEntries == 0">empty</DisplayString>
+    <DisplayString Condition="NumEntries != 0">{{ entries={NumEntries}, buckets={NumBuckets} }}</DisplayString>
+    <Expand>
+      <Item Name="[NumEntries]">NumEntries</Item>
+      <Item Name="[NumBuckets]">NumBuckets</Item>
+      <ArrayItems>
+        <Size>NumBuckets</Size>
+        <ValuePointer>Buckets</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::StringMap&lt;*,*&gt;">
+    <DisplayString>{{ NumBuckets={NumBuckets}, ItemSize={ItemSize} }}</DisplayString>
+    <Expand>
+      <Item Name="[NumBuckets]">NumBuckets</Item>
+      <Item Name="[ItemSize]">ItemSize</Item>
+      <IndexListItems>
+        <Size>NumBuckets</Size>
+        <ValueNode>(llvm::StringMapEntry&lt;$T1&gt;*)TheTable[$i]</ValueNode>
+      </IndexListItems>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::StringMapEntry&lt;*&gt;">
+    <DisplayString Condition="StrLen == 0">empty</DisplayString>
+    <DisplayString Condition="StrLen != 0">({((llvm::StringMapEntry&lt;$T1&gt;*)this)+1,s}, {second})</DisplayString>
+    <Expand>
+      <Item Name="[key]">((llvm::StringMapEntry&lt;$T1&gt;*)this)+1,s</Item>
+      <Item Name="[value]" Condition="StrLen != 0">second</Item>
+    </Expand>
+  </Type>
+
+  <Type Name="llvm::Triple">
+    <DisplayString>{Data}</DisplayString>
+  </Type>
+</AutoVisualizer>