[clang] [llvm] [WebAssembly] Implement an alternative translation for -wasm-enable-sjlj (PR #84137)

[YAMAMOTO Takashi via cfe-commits]

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@@ -198,9 +198,18 @@
 ///
 /// If there are calls to setjmp()
 ///
-/// 2) and 3): The same as 2) and 3) in Emscripten SjLj.
-/// (setjmpTable/setjmpTableSize initialization + setjmp callsite
-/// transformation)
+/// 2) In the function entry that calls setjmp, initialize
+///    functionInvocationId as follows:
+///
+///    functionInvocationId = alloca()
+///
+/// 3) Lower
+///      setjmp(env)
+///    into
+///      __wasm_setjmp(env, label, functionInvocationId)
+///
+///    A BB with setjmp is split into two after setjmp call in order to
+///    make the post-setjmp BB the possible destination of longjmp BB.
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yamt wrote:

done

https://github.com/llvm/llvm-project/pull/84137