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Primitive support for non-copyable values

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This commit is contained in:
Marijn Haverbeke 2011-06-25 12:22:50 +02:00
parent f6753be655
commit 7432017d5e
2 changed files with 25 additions and 10 deletions
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27
src/comp/middle/trans.rs
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@ -3064,30 +3064,37 @@ tag copy_action { INIT; DROP_EXISTING; }
fn copy_val(&@block_ctxt cx, copy_action action, ValueRef dst, ValueRef src,
&ty::t t) -> result {
if (ty::type_is_scalar(cx.fcx.lcx.ccx.tcx, t) ||
ty::type_is_native(cx.fcx.lcx.ccx.tcx, t)) {
auto ccx = cx.fcx.lcx.ccx;
// FIXME this is just a clunky stopgap. we should do proper checking in an
// earlier pass.
if (!ty::type_is_copyable(ccx.tcx, t)) {
ccx.sess.span_err(cx.sp, "Copying a non-copyable type.");
}
if (ty::type_is_scalar(ccx.tcx, t) ||
ty::type_is_native(ccx.tcx, t)) {
ret rslt(cx, cx.build.Store(src, dst));
} else if (ty::type_is_nil(cx.fcx.lcx.ccx.tcx, t) ||
ty::type_is_bot(cx.fcx.lcx.ccx.tcx, t)) {
} else if (ty::type_is_nil(ccx.tcx, t) ||
ty::type_is_bot(ccx.tcx, t)) {
ret rslt(cx, C_nil());
} else if (ty::type_is_boxed(cx.fcx.lcx.ccx.tcx, t)) {
} else if (ty::type_is_boxed(ccx.tcx, t)) {
auto r = take_ty(cx, src, t);
if (action == DROP_EXISTING) {
r = drop_ty(r.bcx, r.bcx.build.Load(dst), t);
}
ret rslt(r.bcx, r.bcx.build.Store(src, dst));
} else if (ty::type_is_structural(cx.fcx.lcx.ccx.tcx, t) ||
ty::type_has_dynamic_size(cx.fcx.lcx.ccx.tcx, t)) {
} else if (ty::type_is_structural(ccx.tcx, t) ||
ty::type_has_dynamic_size(ccx.tcx, t)) {
auto r = take_ty(cx, src, t);
if (action == DROP_EXISTING) { r = drop_ty(r.bcx, dst, t); }
r = memmove_ty(r.bcx, dst, src, t);
if (ty::type_owns_heap_mem(cx.fcx.lcx.ccx.tcx, t)) {
if (ty::type_owns_heap_mem(ccx.tcx, t)) {
r = duplicate_heap_parts(cx, dst, t);
}
ret r;
}
cx.fcx.lcx.ccx.sess.bug("unexpected type in trans::copy_val: " +
ty_to_str(cx.fcx.lcx.ccx.tcx, t));
ccx.sess.bug("unexpected type in trans::copy_val: " +
ty_to_str(ccx.tcx, t));
}

8
src/comp/middle/ty.rs
View file

@ -170,6 +170,7 @@ export type_is_scalar;
export type_is_sequence;
export type_is_signed;
export type_is_structural;
export type_is_copyable;
export type_is_tup_like;
export type_is_str;
export type_owns_heap_mem;
@ -896,6 +897,13 @@ fn type_is_structural(&ctxt cx, &t ty) -> bool {
}
}
fn type_is_copyable(&ctxt cx, &t ty) -> bool {
ret alt (struct(cx, ty)) {
case (ty_res(_, _)) { false }
case (_) { true }
};
}
fn type_is_sequence(&ctxt cx, &t ty) -> bool {
alt (struct(cx, ty)) {
case (ty_str) { ret true; }