1 files changed, 23 insertions, 12 deletions

diff --git a/clang/lib/CodeGen/CGObjCGNU.cpp b/clang/lib/CodeGen/CGObjCGNU.cpp
index 9443fecf9b79..cd1a0b6a130f 100644
--- a/clang/lib/CodeGen/CGObjCGNU.cpp
+++ b/clang/lib/CodeGen/CGObjCGNU.cpp
@@ -168,6 +168,8 @@ protected:
   /// Does the current target use SEH-based exceptions? False implies
   /// Itanium-style DWARF unwinding.
   bool usesSEHExceptions;
+  /// Does the current target uses C++-based exceptions?
+  bool usesCxxExceptions;
 
   /// Helper to check if we are targeting a specific runtime version or later.
   bool isRuntime(ObjCRuntime::Kind kind, unsigned major, unsigned minor=0) {
@@ -819,12 +821,18 @@ class CGObjCGNUstep : public CGObjCGNU {
       SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy,
                              PtrToObjCSuperTy, SelectorTy);
       // If we're in ObjC++ mode, then we want to make
-      if (usesSEHExceptions) {
-          llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
-          // void objc_exception_rethrow(void)
-          ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy);
+      llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
+      if (usesCxxExceptions) {
+        // void *__cxa_begin_catch(void *e)
+        EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy);
+        // void __cxa_end_catch(void)
+        ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy);
+        // void objc_exception_rethrow(void*)
+        ExceptionReThrowFn.init(&CGM, "__cxa_rethrow", PtrTy);
+      } else if (usesSEHExceptions) {
+        // void objc_exception_rethrow(void)
+        ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy);
       } else if (CGM.getLangOpts().CPlusPlus) {
-        llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
         // void *__cxa_begin_catch(void *e)
         EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy);
         // void __cxa_end_catch(void)
@@ -833,7 +841,6 @@ class CGObjCGNUstep : public CGObjCGNU {
         ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy,
                                 PtrTy);
       } else if (R.getVersion() >= VersionTuple(1, 7)) {
-        llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
         // id objc_begin_catch(void *e)
         EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy);
         // void objc_end_catch(void)
@@ -841,7 +848,6 @@ class CGObjCGNUstep : public CGObjCGNU {
         // void _Unwind_Resume_or_Rethrow(void*)
         ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy, PtrTy);
       }
-      llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
       SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy,
                              SelectorTy, IdTy, PtrDiffTy);
       SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy,
@@ -2126,6 +2132,9 @@ CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
   msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
   usesSEHExceptions =
       cgm.getContext().getTargetInfo().getTriple().isWindowsMSVCEnvironment();
+  usesCxxExceptions =
+      cgm.getContext().getTargetInfo().getTriple().isOSCygMing() &&
+      isRuntime(ObjCRuntime::GNUstep, 2);
 
   CodeGenTypes &Types = CGM.getTypes();
   IntTy = cast<llvm::IntegerType>(
@@ -2212,7 +2221,10 @@ CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
 
   // void objc_exception_throw(id);
   ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
-  ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
+  ExceptionReThrowFn.init(&CGM,
+                          usesCxxExceptions ? "objc_exception_rethrow"
+                                            : "objc_exception_throw",
+                          VoidTy, IdTy);
   // int objc_sync_enter(id);
   SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy);
   // int objc_sync_exit(id);
@@ -2389,7 +2401,7 @@ llvm::Constant *CGObjCGNUstep::GetEHType(QualType T) {
   if (usesSEHExceptions)
     return CGM.getCXXABI().getAddrOfRTTIDescriptor(T);
 
-  if (!CGM.getLangOpts().CPlusPlus)
+  if (!CGM.getLangOpts().CPlusPlus && !usesCxxExceptions)
     return CGObjCGNU::GetEHType(T);
 
   // For Objective-C++, we want to provide the ability to catch both C++ and
@@ -3995,7 +4007,7 @@ void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
     ExceptionAsObject = CGF.ObjCEHValueStack.back();
     isRethrow = true;
   }
-  if (isRethrow && usesSEHExceptions) {
+  if (isRethrow && (usesSEHExceptions || usesCxxExceptions)) {
     // For SEH, ExceptionAsObject may be undef, because the catch handler is
     // not passed it for catchalls and so it is not visible to the catch
     // funclet.  The real thrown object will still be live on the stack at this
@@ -4005,8 +4017,7 @@ void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
     // argument.
     llvm::CallBase *Throw = CGF.EmitRuntimeCallOrInvoke(ExceptionReThrowFn);
     Throw->setDoesNotReturn();
-  }
-  else {
+  } else {
     ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy);
     llvm::CallBase *Throw =
         CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject);