| /* Alignment-related classes. |
| Copyright (C) 2018-2020 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Align flags tuple with alignment in log form and with a maximum skip. */ |
| |
| struct align_flags_tuple |
| { |
| /* Values of the -falign-* flags: how much to align labels in code. |
| log is "align to 2^log" (so 0 means no alignment). |
| maxskip is the maximum allowed amount of padding to insert. */ |
| int log; |
| int maxskip; |
| |
| /* Normalize filled values so that maxskip is not bigger than 1 << log. */ |
| void normalize () |
| { |
| int n = (1 << log); |
| if (maxskip > n) |
| maxskip = n - 1; |
| } |
| |
| /* Return original value of an alignment flag. */ |
| int get_value () |
| { |
| return maxskip + 1; |
| } |
| }; |
| |
| /* Alignment flags is structure used as value of -align-* options. |
| It's used in target-dependant code. */ |
| |
| class align_flags |
| { |
| public: |
| /* Default constructor. */ |
| align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0) |
| { |
| levels[0].log = log0; |
| levels[0].maxskip = maxskip0; |
| levels[1].log = log1; |
| levels[1].maxskip = maxskip1; |
| normalize (); |
| } |
| |
| /* Normalize both components of align_flags. */ |
| void normalize () |
| { |
| for (unsigned i = 0; i < 2; i++) |
| levels[i].normalize (); |
| } |
| |
| /* Get alignment that is common bigger alignment of alignments F0 and F1. */ |
| static align_flags max (const align_flags f0, const align_flags f1) |
| { |
| int log0 = MAX (f0.levels[0].log, f1.levels[0].log); |
| int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip); |
| int log1 = MAX (f0.levels[1].log, f1.levels[1].log); |
| int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip); |
| return align_flags (log0, maxskip0, log1, maxskip1); |
| } |
| |
| align_flags_tuple levels[2]; |
| }; |
| |
| /* Define maximum supported code alignment. */ |
| #define MAX_CODE_ALIGN 16 |
| #define MAX_CODE_ALIGN_VALUE (1 << MAX_CODE_ALIGN) |