1 /* go-backend.c -- Go frontend interface to gcc backend.
2 Copyright (C) 2010, 2011 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
31 /* This file holds all the cases where the Go frontend needs
32 information from gcc's backend. */
34 /* Return the alignment in bytes of a value of type T. */
37 go_type_alignment (tree t
)
39 return TYPE_ALIGN_UNIT (t
);
42 /* Return the alignment in bytes of a struct field of type T. */
45 go_field_alignment (tree t
)
51 #ifdef BIGGEST_FIELD_ALIGNMENT
52 if (v
> BIGGEST_FIELD_ALIGNMENT
)
53 v
= BIGGEST_FIELD_ALIGNMENT
;
56 #ifdef ADJUST_FIELD_ALIGN
58 tree field ATTRIBUTE_UNUSED
;
59 field
= build_decl (UNKNOWN_LOCATION
, FIELD_DECL
, NULL
, t
);
60 v
= ADJUST_FIELD_ALIGN (field
, v
);
64 return v
/ BITS_PER_UNIT
;
67 /* Return the size and alignment of a trampoline. */
70 go_trampoline_info (unsigned int *size
, unsigned int *alignment
)
72 *size
= TRAMPOLINE_SIZE
;
73 *alignment
= TRAMPOLINE_ALIGNMENT
;
76 /* This is called by the Go frontend proper if the unsafe package was
77 imported. When that happens we can not do type-based alias
81 go_imported_unsafe (void)
83 flag_strict_aliasing
= false;
85 /* This is a real hack. init_varasm_once has already grabbed an
86 alias set, which we don't want when we aren't doing strict
87 aliasing. We reinitialize to make it do it again. This should
88 be OK in practice since we haven't really done anything yet. */
91 /* Let the backend know that the options have changed. */
92 targetm
.override_options_after_change ();