Revert "[SEH] Remove the old __C_specific_handler code now that WinEHPrepare works"

[oota-llvm.git] / lib / CodeGen / WinEHPrepare.cpp

diff --git a/lib/CodeGen/WinEHPrepare.cpp b/lib/CodeGen/WinEHPrepare.cpp
index e11da29fedc681eb84b27281204a87b0c7cb8d52..57671f093784422fe8c0ecd9a2081a423554c80b 100644 (file)
--- a/lib/CodeGen/WinEHPrepare.cpp
+++ b/lib/CodeGen/WinEHPrepare.cpp
@@ -323,6 +323,11 @@ FunctionPass *llvm::createWinEHPass(const TargetMachine *TM) {
   return new WinEHPrepare(TM);
 }
 
+// FIXME: Remove this once the backend can handle the prepared IR.
+static cl::opt<bool>
+    SEHPrepare("sehprepare", cl::Hidden,
+               cl::desc("Prepare functions with SEH personalities"));
+
 bool WinEHPrepare::runOnFunction(Function &Fn) {
   // No need to prepare outlined handlers.
   if (Fn.hasFnAttribute("wineh-parent"))
@@ -350,6 +355,16 @@ bool WinEHPrepare::runOnFunction(Function &Fn) {
 
   DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
 
+  if (isAsynchronousEHPersonality(Personality) && !SEHPrepare) {
+    // Replace all resume instructions with unreachable.
+    // FIXME: Remove this once the backend can handle the prepared IR.
+    for (ResumeInst *Resume : Resumes) {
+      IRBuilder<>(Resume).CreateUnreachable();
+      Resume->eraseFromParent();
+    }
+    return true;
+  }
+
   // If there were any landing pads, prepareExceptionHandlers will make changes.
   prepareExceptionHandlers(Fn, LPads);
   return true;