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offset_of

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This commit is contained in:
DrMeepster
2022-09-11 00:37:49 -07:00
parent b92a41c676
commit 511e457c4b
71 changed files with 841 additions and 38 deletions
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7
compiler/rustc_const_eval/src/interpret/step.rs
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@@ -280,10 +280,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
self.write_immediate(*val, &dest)?;
}
NullaryOp(null_op, ty) => {
NullaryOp(ref null_op, ty) => {
let ty = self.subst_from_current_frame_and_normalize_erasing_regions(ty)?;
let layout = self.layout_of(ty)?;
if layout.is_unsized() {
if let mir::NullOp::SizeOf | mir::NullOp::AlignOf = null_op && layout.is_unsized() {
// FIXME: This should be a span_bug (#80742)
self.tcx.sess.delay_span_bug(
self.frame().current_span(),
@@ -294,6 +294,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
let val = match null_op {
mir::NullOp::SizeOf => layout.size.bytes(),
mir::NullOp::AlignOf => layout.align.abi.bytes(),
mir::NullOp::OffsetOf(fields) => {
layout.offset_of_subfield(self, fields.iter().map(|f| f.index())).bytes()
}
};
self.write_scalar(Scalar::from_target_usize(val, self), &dest)?;
}