[PATCH] D67208: [WebAssembly] Add -fwasm-exceptions for wasm EH

[Heejin Ahn via Phabricator via cfe-commits]

aheejin created this revision.
aheejin added reviewers: dschuff, tlively.
Herald added subscribers: cfe-commits, sunfish, jgravelle-google, sbc100, aprantl.
Herald added a project: clang.

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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D67208

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/CodeGen/CGException.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Driver/ToolChains/WebAssembly.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGenCXX/wasm-eh.cpp
  clang/test/Driver/wasm-toolchain.c

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