[WinEH] Make FuncletLayout more robust against catchret

Catchret transfers control from a catch funclet to an earlier funclet.
However, it is not completely clear which funclet the catchret target is
part of.  Make this clear by stapling the catchret target's funclet
membership onto the CATCHRET SDAG node.

llvm-svn: 249052

1 files changed, 13 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 4f9656532c2..f779fd1b03a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1168,9 +1168,21 @@ void SelectionDAGBuilder::visitCatchRet(const CatchReturnInst &I) {
   MachineBasicBlock *TargetMBB = FuncInfo.MBBMap[I.getSuccessor()];
   FuncInfo.MBB->addSuccessor(TargetMBB);
 
+  // Figure out the funclet membership for the catchret's successor.
+  // This will be used by the FuncletLayout pass to determine how to order the
+  // BB's.
+  MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
+  WinEHFuncInfo &EHInfo =
+      MMI.getWinEHFuncInfo(DAG.getMachineFunction().getFunction());
+  const BasicBlock *SuccessorColor = EHInfo.CatchRetSuccessorColorMap[&I];
+  assert(SuccessorColor && "No parent funclet for catchret!");
+  MachineBasicBlock *SuccessorColorMBB = FuncInfo.MBBMap[SuccessorColor];
+  assert(SuccessorColorMBB && "No MBB for SuccessorColor!");
+
   // Create the terminator node.
   SDValue Ret = DAG.getNode(ISD::CATCHRET, getCurSDLoc(), MVT::Other,
-                            getControlRoot(), DAG.getBasicBlock(TargetMBB));
+                            getControlRoot(), DAG.getBasicBlock(TargetMBB),
+                            DAG.getBasicBlock(SuccessorColorMBB));
   DAG.setRoot(Ret);
 }