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add check that simd_shuffle arguments are constants

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This commit is contained in:
Ralf Jung 2021-05-11 10:17:25 +02:00
parent 44a8e8d745
commit 2e8e91ce25
1 changed files with 15 additions and 1 deletions
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16
compiler/rustc_mir/src/transform/lower_intrinsics.rs
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@ -5,6 +5,7 @@ use rustc_middle::mir::*;
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use rustc_target::spec::abi::Abi;
pub struct LowerIntrinsics;
@ -119,6 +120,9 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
}
_ if intrinsic_name.as_str().starts_with("simd_shuffle") => {
validate_simd_shuffle(tcx, args, terminator.source_info.span);
}
_ => {}
}
}
@ -132,9 +136,19 @@ fn resolve_rust_intrinsic(
) -> Option<(Symbol, SubstsRef<'tcx>)> {
if let ty::FnDef(def_id, substs) = *func_ty.kind() {
let fn_sig = func_ty.fn_sig(tcx);
if fn_sig.abi() == Abi::RustIntrinsic {
if let Abi::RustIntrinsic | Abi::PlatformIntrinsic = fn_sig.abi() {
return Some((tcx.item_name(def_id), substs));
}
}
None
}
fn validate_simd_shuffle(tcx: TyCtxt<'tcx>, args: &[Operand<'tcx>], span: Span) {
match &args[2] {
Operand::Constant(_) => {} // all good
_ => {
let msg = format!("last argument of `simd_shuffle` is required to be a `const` item");
tcx.sess.span_err(span, &msg);
}
}
}