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Convert const field extraction to trans::adt

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This commit is contained in:
Jed Davis 2013-02-24 15:03:47 -08:00
parent 59daf76a8d
commit 075affa50d
1 changed files with 3 additions and 7 deletions
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10
src/librustc/middle/trans/consts.rs
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@ -240,16 +240,12 @@ fn const_expr_unchecked(cx: @CrateContext, e: @ast::expr) -> ValueRef {
}
ast::expr_field(base, field, _) => {
let bt = ty::expr_ty(cx.tcx, base);
let brepr = adt::represent_type(cx, bt);
let bv = const_expr(cx, base);
let (bt, bv) = const_autoderef(cx, bt, bv);
do expr::with_field_tys(cx.tcx, bt, None) |_, field_tys| {
do expr::with_field_tys(cx.tcx, bt, None) |discr, field_tys| {
let ix = ty::field_idx_strict(cx.tcx, field, field_tys);
// Note: ideally, we'd use `struct_field()` here instead
// of hardcoding [0, ix], but we can't because it yields
// the wrong type and also inserts an extra 0 that is
// not needed in the constant variety:
const_get_elt(cx, bv, [0, ix as c_uint])
adt::const_get_element(cx, &brepr, bv, discr, ix)
}
}