[PATCH] D107530: [WebAssembly] Don't do SjLj transformation when there's only setjmp

[Heejin Ahn via Phabricator via llvm-commits]

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When there is a `setjmp` call in a function, we transform every callsite
of `setjmp` to record its information by calling `saveSetjmp` function,
and we also transform every callsite of a function that can longjmp to
to check if a longjmp occurred and if so jump to the corresponding
post-setjmp BB. Currently we are doing this for every function that
contains a call to `setjmp`, but if there is no other function call
within that function that can longjmp, this transformation of `setjmp`
callsite and all the preparation of `setjmpTable`s in the entry of the
function is not necessary.

This checks if a setjmp-calling function has any other calls that can
longjmp, and if not, skips the function for the SjLj transformation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D107530

Files:
  llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
  llvm/test/CodeGen/WebAssembly/lower-em-sjlj-alias.ll
  llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll

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