[WebAssembly] Add -fwasm-exceptions for wasm EH

Summary:
This adds `-fwasm-exceptions` (in similar fashion with
`-fdwarf-exceptions` or `-fsjlj-exceptions`) that turns on everything
with wasm exception handling from the frontend to the backend.

We currently have `-mexception-handling` in clang frontend, but this is
only about the architecture capability and does not turn on other
necessary options such as the exception model in the backend. (This can
be turned on with `llc -exception-model=wasm`, but llc is not invoked
separately as a command line tool, so this option has to be transferred
from clang.)

Turning on `-fwasm-exceptions` in clang also turns on
`-mexception-handling` if not specified, and will error out if
`-mno-exception-handling` is specified.

Reviewers: dschuff, tlively, sbc100

Subscribers: aprantl, jgravelle-google, sunfish, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D67208

llvm-svn: 371708

1 files changed, 1 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 4c94cfb2334..645d7a878e3 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -165,10 +165,7 @@ static const EHPersonality &getCXXPersonality(const TargetInfo &Target,
     return EHPersonality::GNU_CPlusPlus;
   if (L.SEHExceptions)
     return EHPersonality::GNU_CPlusPlus_SEH;
-  // Wasm EH is a non-MVP feature for now.
-  if (Target.hasFeature("exception-handling") &&
-      (T.getArch() == llvm::Triple::wasm32 ||
-       T.getArch() == llvm::Triple::wasm64))
+  if (L.WasmExceptions)
     return EHPersonality::GNU_Wasm_CPlusPlus;
   return EHPersonality::GNU_CPlusPlus;
 }