CODEWITHSUNDEEP
llvmvoid
elmattic
elmattic

Reputation: 12184

LLVM IR main function returning void

I'm testing a main function that simply returns void and am get core dump errors (signal 65 or 73) when running the bitcode with lli:

define void @main() {
entry:
  ret void
}

Is it a limitation of lli or just plain illegal in LLVM?

I'm well aware that in C++ the declaration of a main function with a return type of void is incorrect. In fact I've tried this with Clang (it's just a warning to do so) and get almost the same code (not exactly the same because of the #0 attributes, but close enough that I believe the differences are not causing this problem):

; Function Attrs: nounwind
define void @main() #0 {
entry:
  ret void
}

Upvotes: 6

Views: 3393

Answers (1)

Oak
Oak

Reputation: 26898

It doesn't crash for me, so the culprit must be something else:

$ echo "define void @main() {entry: ret void}" | lli -
$

In any case, lli supports void main methods, as you can see in ExecutionEngine::runFunctionAsMain().

Upvotes: 5

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