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Don't codegen wasm.throw unless with -Zbuild-std

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Noa 2024-02-26 11:56:48 -06:00
parent 125b26acf6
commit c7fcf437f1
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1 changed files with 10 additions and 1 deletions
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9
library/unwind/src/wasm.rs
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@ -40,6 +40,7 @@ pub unsafe fn _Unwind_DeleteException(exception: *mut _Unwind_Exception) {
}
pub unsafe fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code {
#[cfg(panic = "unwind")]
extern "C" {
/// LLVM lowers this intrinsic to the `throw` instruction.
// FIXME(coolreader18): move to stdarch
@ -52,5 +53,13 @@ pub unsafe fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwi
// via integers, with 0 corresponding to C++ exceptions and 1 to C setjmp()/longjmp().
// Ideally, we'd be able to choose something unique for Rust, but for now,
// we pretend to be C++ and implement the Itanium exception-handling ABI.
cfg_if::cfg_if! {
// for now, unless we're -Zbuild-std with panic=unwind, never codegen a throw.
if #[cfg(panic = "unwind")] {
wasm_throw(0, exception.cast())
} else {
let _ = exception;
core::arch::wasm32::unreachable()
}
}
}