65 lines
2.2 KiB
Rust
65 lines
2.2 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use back;
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use lib::llvm::ValueRef;
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use middle::trans::base::*;
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use middle::trans::build::*;
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use middle::trans::common::*;
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use middle::trans::datum::immediate_rvalue;
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use middle::trans::datum;
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use middle::trans::glue;
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use middle::ty;
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pub fn make_free_glue(bcx: block, vptrptr: ValueRef, box_ty: ty::t)
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-> block {
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let _icx = bcx.insn_ctxt("uniq::make_free_glue");
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let box_datum = immediate_rvalue(Load(bcx, vptrptr), box_ty);
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let not_null = IsNotNull(bcx, box_datum.val);
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do with_cond(bcx, not_null) |bcx| {
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let body_datum = box_datum.box_body(bcx);
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let bcx = glue::drop_ty(bcx, body_datum.to_ref_llval(bcx),
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body_datum.ty);
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if ty::type_contents(bcx.tcx(), box_ty).contains_managed() {
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glue::trans_free(bcx, box_datum.val)
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} else {
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glue::trans_exchange_free(bcx, box_datum.val)
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}
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}
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}
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pub fn duplicate(bcx: block, src_box: ValueRef, src_ty: ty::t) -> Result {
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let _icx = bcx.insn_ctxt("uniq::duplicate");
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// Load the body of the source (*src)
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let src_datum = immediate_rvalue(src_box, src_ty);
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let body_datum = src_datum.box_body(bcx);
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// Malloc space in exchange heap and copy src into it
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let MallocResult {
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bcx: bcx,
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box: dst_box,
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body: dst_body
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} = malloc_unique(bcx, body_datum.ty);
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body_datum.copy_to(bcx, datum::INIT, dst_body);
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// Copy the type descriptor
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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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return rslt(bcx, dst_box);
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}
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