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use rustc_ast as ast;
use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
use rustc_middle::ty::{self, ParamEnv, ScalarInt, TyCtxt};
use rustc_span::DUMMY_SP;
pub(crate) fn lit_to_const<'tcx>(
tcx: TyCtxt<'tcx>,
lit_input: LitToConstInput<'tcx>,
) -> Result<ty::Const<'tcx>, LitToConstError> {
let LitToConstInput { lit, ty, neg } = lit_input;
let trunc = |n| {
let param_ty = ParamEnv::reveal_all().and(ty);
let width = tcx
.layout_of(param_ty)
.map_err(|_| {
LitToConstError::Reported(tcx.sess.delay_span_bug(
DUMMY_SP,
format!("couldn't compute width of literal: {:?}", lit_input.lit),
))
})?
.size;
trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
let result = width.truncate(n);
trace!("trunc result: {}", result);
Ok(ScalarInt::try_from_uint(result, width)
.unwrap_or_else(|| bug!("expected to create ScalarInt from uint {:?}", result)))
};
let valtree = match (lit, &ty.kind()) {
(ast::LitKind::Str(s, _), ty::Ref(_, inner_ty, _)) if inner_ty.is_str() => {
let str_bytes = s.as_str().as_bytes();
ty::ValTree::from_raw_bytes(tcx, str_bytes)
}
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _))
if matches!(inner_ty.kind(), ty::Slice(_)) =>
{
let bytes = data as &[u8];
ty::ValTree::from_raw_bytes(tcx, bytes)
}
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _)) if inner_ty.is_array() => {
let bytes = data as &[u8];
ty::ValTree::from_raw_bytes(tcx, bytes)
}
(ast::LitKind::Byte(n), ty::Uint(ty::UintTy::U8)) => {
ty::ValTree::from_scalar_int((*n).into())
}
(ast::LitKind::Int(n, _), ty::Uint(_)) | (ast::LitKind::Int(n, _), ty::Int(_)) => {
let scalar_int =
trunc(if neg { (*n as i128).overflowing_neg().0 as u128 } else { *n })?;
ty::ValTree::from_scalar_int(scalar_int)
}
(ast::LitKind::Bool(b), ty::Bool) => ty::ValTree::from_scalar_int((*b).into()),
(ast::LitKind::Char(c), ty::Char) => ty::ValTree::from_scalar_int((*c).into()),
(ast::LitKind::Err, _) => {
return Err(LitToConstError::Reported(
tcx.sess.delay_span_bug(DUMMY_SP, "encountered LitKind::Err during mir build"),
));
}
_ => return Err(LitToConstError::TypeError),
};
Ok(tcx.mk_const(valtree, ty))
}
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