[PATCH] D147165: [Windows SEH] Fix catch+return crash for Windows -EHa

[Phoebe Wang via Phabricator via cfe-commits]

pengfei created this revision.
pengfei added reviewers: tentzen, efriedma, victork1996.
Herald added subscribers: kbarton, nemanjai.
Herald added a project: All.
pengfei requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay.
Herald added a project: clang.

This change also turns on -fasync-exceptions by default under -EHa
option due to the backend patch merged.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147165

Files:
  clang/lib/CodeGen/CGCleanup.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/CodeGen/windows-seh-EHa-CppCatchReturn.cpp


Index: clang/test/CodeGen/windows-seh-EHa-CppCatchReturn.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGen/windows-seh-EHa-CppCatchReturn.cpp
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple x86_64-windows -fasync-exceptions -fcxx-exceptions -fexceptions -fms-extensions -x c++ -Wno-implicit-function-declaration -S -emit-llvm %s -o - | FileCheck %s
+
+// CHECK: define dso_local void @"?foo@@YAXXZ
+// CHECK: invoke void @llvm.seh.try.begin()
+// CHECK-NOT: llvm.seh.scope.begin
+// CHECK-NOT: llvm.seh.scope.end
+
+// FIXME: Do we actually need llvm.seh.scope*?
+void foo() {
+  try {}
+  catch (...) {
+  return;
+  }
+}
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -7700,6 +7700,8 @@
     if (types::isCXX(InputType))
       CmdArgs.push_back("-fcxx-exceptions");
     CmdArgs.push_back("-fexceptions");
+    if (EH.Asynch)
+      CmdArgs.push_back("-fasync-exceptions");
   }
   if (types::isCXX(InputType) && EH.Synch && EH.NoUnwindC)
     CmdArgs.push_back("-fexternc-nounwind");
Index: clang/lib/CodeGen/CGCleanup.cpp
===================================================================
--- clang/lib/CodeGen/CGCleanup.cpp
+++ clang/lib/CodeGen/CGCleanup.cpp
@@ -836,7 +836,7 @@
       EmitBlock(NormalEntry);
 
       // intercept normal cleanup to mark SEH scope end
-      if (IsEHa) {
+      if (IsEHa && getInvokeDest()) {
         if (Personality.isMSVCXXPersonality())
           EmitSehCppScopeEnd();
         else


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D147165.509387.patch
Type: text/x-patch
Size: 1640 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20230329/7212d90b/attachment-0001.bin>