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Translate the swap operator.

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Michael Sullivan 2011-06-14 18:51:35 -07:00 committed by Graydon Hoare
parent bc33a5fe50
commit 272c7e2e87
1 changed files with 18 additions and 0 deletions
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18
src/comp/middle/trans.rs
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@ -5585,6 +5585,24 @@ fn trans_expr_out(&@block_ctxt cx, &@ast::expr e, out_method output) ->
rhs_res.val, t);
ret res(copy_res.bcx, C_nil());
}
case (ast::expr_swap(?dst, ?src, _)) {
auto lhs_res = trans_lval(cx, dst);
assert (lhs_res.is_mem);
// FIXME Fill in lhs_res.res.bcx.sp
auto rhs_res = trans_lval(lhs_res.res.bcx, src);
auto t = ty::expr_ty(cx.fcx.lcx.ccx.tcx, src);
auto tmp_res = alloc_ty(rhs_res.res.bcx, t);
// Swap through a temporary.
auto move1_res = memmove_ty(tmp_res.bcx, tmp_res.val,
lhs_res.res.val, t);
auto move2_res = memmove_ty(move1_res.bcx, lhs_res.res.val,
rhs_res.res.val, t);
auto move3_res = memmove_ty(move2_res.bcx, rhs_res.res.val,
tmp_res.val, t);
ret res(move3_res.bcx, C_nil());
}
case (ast::expr_assign_op(?op, ?dst, ?src, _)) {
auto t = ty::expr_ty(cx.fcx.lcx.ccx.tcx, src);
auto lhs_res = trans_lval(cx, dst);