r255521 - [MS ABI] Don't rely on terminatepad

[David Majnemer via cfe-commits]

Author: majnemer
Date: Mon Dec 14 12:34:18 2015
New Revision: 255521

URL: http://llvm.org/viewvc/llvm-project?rev=255521&view=rev
Log:
[MS ABI] Don't rely on terminatepad

We'd like to remove support for terminatepad from LLVM.  To do this, we
need to move Clang off of it first.  The intent behind terminatepad was
to carefully model exception specifications for the MSVC personality.

However, we don't support exception specifications for the MSVC
personality and neither does MSVC.  Instead, MSVC supports
all-or-nothing exception specifications.  We can model this limited
usage using cleanuppads which call std::terminate.

Differential Revision: http://reviews.llvm.org/D15478

Modified:
    cfe/trunk/lib/CodeGen/CGException.cpp
    cfe/trunk/test/CodeGenCXX/exceptions-cxx-new.cpp
    cfe/trunk/test/CodeGenCXX/microsoft-abi-eh-terminate.cpp

Modified: cfe/trunk/lib/CodeGen/CGException.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGException.cpp?rev=255521&r1=255520&r2=255521&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGException.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGException.cpp Mon Dec 14 12:34:18 2015
@@ -1325,21 +1325,20 @@ llvm::BasicBlock *CodeGenFunction::getTe
   // end of the function by FinishFunction.
   TerminateHandler = createBasicBlock("terminate.handler");
   Builder.SetInsertPoint(TerminateHandler);
+  llvm::Value *Exn = nullptr;
   if (EHPersonality::get(*this).usesFuncletPads()) {
     llvm::Value *ParentPad = CurrentFuncletPad;
     if (!ParentPad)
       ParentPad = llvm::ConstantTokenNone::get(CGM.getLLVMContext());
-    Builder.CreateTerminatePad(ParentPad, /*UnwindBB=*/nullptr,
-                               {CGM.getTerminateFn()});
+    Builder.CreateCleanupPad(ParentPad);
   } else {
-    llvm::Value *Exn = nullptr;
     if (getLangOpts().CPlusPlus)
       Exn = getExceptionFromSlot();
-    llvm::CallInst *terminateCall =
-        CGM.getCXXABI().emitTerminateForUnexpectedException(*this, Exn);
-    terminateCall->setDoesNotReturn();
-    Builder.CreateUnreachable();
   }
+  llvm::CallInst *terminateCall =
+      CGM.getCXXABI().emitTerminateForUnexpectedException(*this, Exn);
+  terminateCall->setDoesNotReturn();
+  Builder.CreateUnreachable();
 
   // Restore the saved insertion state.
   Builder.restoreIP(SavedIP);

Modified: cfe/trunk/test/CodeGenCXX/exceptions-cxx-new.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/exceptions-cxx-new.cpp?rev=255521&r1=255520&r2=255521&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/exceptions-cxx-new.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/exceptions-cxx-new.cpp Mon Dec 14 12:34:18 2015
@@ -72,5 +72,6 @@ void test_cleanup() {
 // CHECK:   ret void
 
 // CHECK: [[TERMINATE]]
-// CHECK:   terminatepad within none [void ()* @"\01?terminate@@YAXXZ"] unwind to caller
+// CHECK:   cleanuppad within none []
+// CHECK-NEXT:   call void @"\01?terminate@@YAXXZ"()
 

Modified: cfe/trunk/test/CodeGenCXX/microsoft-abi-eh-terminate.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/microsoft-abi-eh-terminate.cpp?rev=255521&r1=255520&r2=255521&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/microsoft-abi-eh-terminate.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/microsoft-abi-eh-terminate.cpp Mon Dec 14 12:34:18 2015
@@ -9,6 +9,7 @@ void never_throws() noexcept(true) {
 // CHECK-LABEL: define void @"\01?never_throws@@YAXXZ"()
 // CHECK-SAME:          personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
 // CHECK:      invoke void @"\01?may_throw@@YAXXZ"()
-// MSVC2013:      terminatepad within none [void ()* @"\01?terminate@@YAXXZ"]
-// MSVC2015:      terminatepad within none [void ()* @__std_terminate]
+// CHECK:      cleanuppad within none []
+// MSVC2013:      call void @"\01?terminate@@YAXXZ"()
+// MSVC2015:      call void @__std_terminate()
 // CHECK-NEXT: unreachable