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Use the LLVM option NoTrapAfterNoreturn #110494

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Dec 16, 2023
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Use the LLVM option NoTrapAfterNoreturn #110494

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8 changes: 8 additions & 0 deletions compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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Expand Up @@ -480,6 +480,14 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
// it prevents control flow from "falling through" into whatever code
// happens to be laid out next in memory.
Options.TrapUnreachable = true;
// But don't emit traps after other traps or no-returns unnecessarily.
// ...except for when targeting WebAssembly, because the NoTrapAfterNoreturn
// option causes bugs in the LLVM WebAssembly backend. You should be able to
// remove this check when Rust's minimum supported LLVM version is >= 18
// https://github.com/llvm/llvm-project/pull/65876
if (!Trip.isWasm()) {
Options.NoTrapAfterNoreturn = true;
}
}

if (Singlethread) {
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