[WinEH] Generate .xdata for catch handlers

This lets us catch exceptions in simple cases.

N.B. Things that do not work include (but are not limited to):
- Throwing from within a catch handler.
- Catching an object with a named catch parameter.
- 'CatchHigh' is fictitious, we aren't sure of its purpose.
- We aren't entirely efficient with regards to the number of EH states
  that we generate.
- IP-to-State tables are sensitive to the order of emission.

llvm-svn: 233767

1 files changed, 0 insertions, 12 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index fd9d7e6b69a..fa58614a4b3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5450,18 +5450,6 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
   case Intrinsic::eh_begincatch:
   case Intrinsic::eh_endcatch:
     llvm_unreachable("begin/end catch intrinsics not lowered in codegen");
-  case Intrinsic::eh_parentframe: {
-    AllocaInst *Slot =
-        cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts());
-    assert(FuncInfo.StaticAllocaMap.count(Slot) &&
-           "can only use static allocas with llvm.eh.parentframe");
-    int FI = FuncInfo.StaticAllocaMap[Slot];
-    MachineFunction &MF = DAG.getMachineFunction();
-    const Function *F = MF.getFunction();
-    MachineModuleInfo &MMI = MF.getMMI();
-    MMI.getWinEHFuncInfo(F).CatchHandlerParentFrameObjIdx[F] = FI;
-    return nullptr;
-  }
   case Intrinsic::eh_unwindhelp: {
     AllocaInst *Slot =
         cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts());