[PATCH] Outline C++ exception handlers for MSVC targets.

[Reid Kleckner]

Looks like a good incremental step to me.

I added David Majnemer to see if he has anything.


REPOSITORY
  rL LLVM

================
Comment at: lib/CodeGen/WinEHPrepare.cpp:61-93
@@ -47,2 +60,35 @@
+
+class WinEHCatchDirector : public CloningDirector
+{
+public:
+  WinEHCatchDirector(LandingPadInst *LPI,
+                     Function       *CatchFn,
+                     Value          *Selector,
+                     Value          *EHObj) :
+      LPI(LPI),
+      CatchFn(CatchFn),
+      CurrentSelector(Selector->stripPointerCasts()),
+      EHObj(EHObj),
+      SelectorIDType(Type::getInt32Ty(LPI->getContext())),
+      Int8PtrType(Type::getInt8PtrTy(LPI->getContext())) {}
+  virtual ~WinEHCatchDirector() {}
+
+  CloningAction handleInstruction(ValueToValueMapTy &VMap,
+                                  const Instruction *Inst,
+                                  BasicBlock        *NewBB) override;
+
+private:
+  LandingPadInst *LPI;
+  Function       *CatchFn;
+  Value          *CurrentSelector;
+  Value          *EHObj;
+  Type           *SelectorIDType;
+  Type           *Int8PtrType;
+
+  const Value    *ExtractedEHPtr;
+  const Value    *ExtractedSelector;
+  const Value    *EHPtrStoreAddr;
+  const Value    *SelectorStoreAddr;
+  const Value    *EHObjStoreAddr;
 };
 } // end anonymous namespace
----------------
I'd rather we went with a clang-format indentation here, as it's the dominant style across LLVM.

http://reviews.llvm.org/D7363

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