src/librustc_back/abi.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 pub const BOX_FIELD_DROP_GLUE: usize = 1;
  12 pub const BOX_FIELD_BODY: usize = 4;
  13
  14 /// The first half of a fat pointer.
  15 /// - For a closure, this is the code address.
  16 /// - For an object or trait instance, this is the address of the box.
  17 /// - For a slice, this is the base address.
  18 pub const FAT_PTR_ADDR: usize = 0;
  19
  20 /// The second half of a fat pointer.
  21 /// - For a closure, this is the address of the environment.
  22 /// - For an object or trait instance, this is the address of the vtable.
  23 /// - For a slice, this is the length.
  24 pub const FAT_PTR_EXTRA: usize = 1;