67 lines
2.2 KiB
Rust
67 lines
2.2 KiB
Rust
import syntax::ast;
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import lib::llvm::ValueRef;
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import common::*;
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import build::*;
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import base::*;
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import shape::llsize_of;
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export trans_uniq, make_free_glue, autoderef, duplicate;
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fn trans_uniq(bcx: block, contents: @ast::expr,
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node_id: ast::node_id, dest: dest) -> block {
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let _icx = bcx.insn_ctxt("uniq::trans_uniq");
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let uniq_ty = node_id_type(bcx, node_id);
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let contents_ty = content_ty(uniq_ty);
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let {box, body} = malloc_unique(bcx, contents_ty);
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add_clean_free(bcx, box, true);
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let bcx = trans_expr_save_in(bcx, contents, body);
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revoke_clean(bcx, box);
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ret store_in_dest(bcx, box, dest);
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}
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fn make_free_glue(bcx: block, vptr: ValueRef, t: ty::t)
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-> block {
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let _icx = bcx.insn_ctxt("uniq::make_free_glue");
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with_cond(bcx, IsNotNull(bcx, vptr)) {|bcx|
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let content_ty = content_ty(t);
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let body_ptr = opaque_box_body(bcx, content_ty, vptr);
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let bcx = drop_ty(bcx, body_ptr, content_ty);
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trans_unique_free(bcx, vptr)
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}
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}
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fn content_ty(t: ty::t) -> ty::t {
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alt ty::get(t).struct {
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ty::ty_uniq({ty: ct, _}) { ct }
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_ { core::unreachable(); }
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}
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}
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fn autoderef(bcx: block, v: ValueRef, t: ty::t) -> {v: ValueRef, t: ty::t} {
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let content_ty = content_ty(t);
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let v = opaque_box_body(bcx, content_ty, v);
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ret {v: v, t: content_ty};
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}
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fn duplicate(bcx: block, v: ValueRef, t: ty::t) -> result {
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let _icx = bcx.insn_ctxt("uniq::duplicate");
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let content_ty = content_ty(t);
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let {box: dst_box, body: dst_body} = malloc_unique(bcx, content_ty);
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let src_box = v;
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let src_body = opaque_box_body(bcx, content_ty, src_box);
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let src_body = load_if_immediate(bcx, src_body, content_ty);
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#debug("ST: %?", val_str(bcx.ccx().tn, src_body));
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#debug("DT: %?", val_str(bcx.ccx().tn, dst_body));
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let bcx = copy_val(bcx, INIT, dst_body, src_body, content_ty);
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let src_tydesc_ptr = GEPi(bcx, src_box,
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[0u, back::abi::box_field_tydesc]);
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let dst_tydesc_ptr = GEPi(bcx, dst_box,
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[0u, back::abi::box_field_tydesc]);
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let td = Load(bcx, src_tydesc_ptr);
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Store(bcx, td, dst_tydesc_ptr);
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ret rslt(bcx, dst_box);
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} |