gcc/rust/rust-gcc.h

   1 // rust-gcc.cc -- Rust frontend to gcc IR.
   2 // Copyright (C) 2011-2024 Free Software Foundation, Inc.
   3 // Contributed by Ian Lance Taylor, Google.
   4 // forked from gccgo
   5
   6 // This file is part of GCC.
   7
   8 // GCC is free software; you can redistribute it and/or modify it under
   9 // the terms of the GNU General Public License as published by the Free
  10 // Software Foundation; either version 3, or (at your option) any later
  11 // version.
  12
  13 // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 // for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with GCC; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include "rust-system.h"
  23
  24 // This has to be included outside of extern "C", so we have to
  25 // include it here before tree.h includes it later.
  26 #include <gmp.h>
  27
  28 #include "tree.h"
  29 #include "rust-location.h"
  30
  31 // TODO: this will have to be significantly modified to work with Rust
  32
  33 // Bvariable is a bit more complicated, because of zero-sized types.
  34 // The GNU linker does not permit dynamic variables with zero size.
  35 // When we see such a variable, we generate a version of the type with
  36 // non-zero size.  However, when referring to the global variable, we
  37 // want an expression of zero size; otherwise, if, say, the global
  38 // variable is passed to a function, we will be passing a
  39 // non-zero-sized value to a zero-sized value, which can lead to a
  40 // miscompilation.
  41
  42 class Bvariable
  43 {
  44 public:
  45   Bvariable (tree t) : t_ (t), orig_type_ (NULL) {}
  46
  47   Bvariable (tree t, tree orig_type) : t_ (t), orig_type_ (orig_type) {}
  48
  49   // Get the tree for use as an expression.
  50   tree get_tree (Location) const;
  51
  52   // Get the actual decl;
  53   tree get_decl () const { return this->t_; }
  54
  55 private:
  56   tree t_;
  57   tree orig_type_;
  58 };