Make it possible to cast unsafe pointers with the 'as' operator
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0a20eed2db
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5b0c103b39
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@ -3269,12 +3269,13 @@ fn trans_cast(cx: @block_ctxt, e: @ast::expr, id: ast::node_id,
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check (type_has_static_size(ccx, t_out));
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let ll_t_out = type_of(ccx, e.span, t_out);
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tag kind { native_; integral; float; other; }
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tag kind { pointer; integral; float; other; }
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fn t_kind(tcx: ty::ctxt, t: ty::t) -> kind {
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ret if ty::type_is_fp(tcx, t) {
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float
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} else if ty::type_is_native(tcx, t) {
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native_
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} else if ty::type_is_native(tcx, t) ||
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ty::type_is_unsafe_ptr(tcx, t) {
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pointer
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} else if ty::type_is_integral(tcx, t) {
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integral
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} else { other };
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@ -3301,13 +3302,13 @@ fn trans_cast(cx: @block_ctxt, e: @ast::expr, id: ast::node_id,
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FPToSI(e_res.bcx, e_res.val, ll_t_out)
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} else { FPToUI(e_res.bcx, e_res.val, ll_t_out) }
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}
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{in: integral., out: native_.} {
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{in: integral., out: pointer.} {
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IntToPtr(e_res.bcx, e_res.val, ll_t_out)
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}
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{in: native_., out: integral.} {
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{in: pointer., out: integral.} {
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PtrToInt(e_res.bcx, e_res.val, ll_t_out)
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}
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{in: native_., out: native_.} {
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{in: pointer., out: pointer.} {
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PointerCast(e_res.bcx, e_res.val, ll_t_out)
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}
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_ { ccx.sess.bug("Translating unsupported cast.") }
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@ -153,6 +153,7 @@ export type_is_bot;
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export type_is_box;
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export type_is_boxed;
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export type_is_unique_box;
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export type_is_unsafe_ptr;
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export type_is_vec;
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export type_is_fp;
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export type_allows_implicit_copy;
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@ -885,6 +886,13 @@ pure fn type_is_unique_box(cx: ctxt, ty: t) -> bool {
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}
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}
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pure fn type_is_unsafe_ptr(cx: ctxt, ty: t) -> bool {
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alt struct(cx, ty) {
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ty_ptr(_) { ret true; }
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_ { ret false; }
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}
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}
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pure fn type_is_vec(cx: ctxt, ty: t) -> bool {
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ret alt struct(cx, ty) {
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ty_vec(_) { true }
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