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1 /* Generic streaming support for basic data types.
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2
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3 Copyright (C) 2011-2020 Free Software Foundation, Inc.
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4 Contributed by Diego Novillo <dnovillo@google.com>
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #include "config.h"
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23 #include "system.h"
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24 #include "coretypes.h"
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25 #include "backend.h"
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26 #include "tree.h"
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27 #include "gimple.h"
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28 #include "cgraph.h"
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29 #include "data-streamer.h"
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30
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31 /* Pack WORK into BP in a variant of uleb format. */
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32
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33 void
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34 bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work)
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35 {
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36 do
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37 {
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38 unsigned int half_byte = (work & 0x7);
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39 work >>= 3;
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40 if (work != 0)
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41 /* More half_bytes to follow. */
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42 half_byte |= 0x8;
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43
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44 bp_pack_value (bp, half_byte, 4);
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45 }
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46 while (work != 0);
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47 }
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48
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49
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50 /* Pack WORK into BP in a variant of sleb format. */
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51
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52 void
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53 bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work)
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54 {
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55 int more, half_byte;
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56
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57 do
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58 {
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59 half_byte = (work & 0x7);
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60 /* arithmetic shift */
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61 work >>= 3;
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62 more = !((work == 0 && (half_byte & 0x4) == 0)
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63 || (work == -1 && (half_byte & 0x4) != 0));
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64 if (more)
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65 half_byte |= 0x8;
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66
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67 bp_pack_value (bp, half_byte, 4);
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68 }
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69 while (more);
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70 }
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71
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72
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73 /* Unpack VAL from BP in a variant of uleb format. */
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74
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75 unsigned HOST_WIDE_INT
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76 bp_unpack_var_len_unsigned (struct bitpack_d *bp)
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77 {
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78 unsigned HOST_WIDE_INT result = 0;
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79 int shift = 0;
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80 unsigned HOST_WIDE_INT half_byte;
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81
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82 while (true)
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83 {
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84 half_byte = bp_unpack_value (bp, 4);
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85 result |= (half_byte & 0x7) << shift;
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86 shift += 3;
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87 if ((half_byte & 0x8) == 0)
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88 return result;
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89 }
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90 }
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91
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92
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93 /* Unpack VAL from BP in a variant of sleb format. */
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94
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95 HOST_WIDE_INT
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96 bp_unpack_var_len_int (struct bitpack_d *bp)
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97 {
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98 HOST_WIDE_INT result = 0;
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99 int shift = 0;
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100 unsigned HOST_WIDE_INT half_byte;
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101
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102 while (true)
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103 {
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104 half_byte = bp_unpack_value (bp, 4);
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105 result |= (half_byte & 0x7) << shift;
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106 shift += 3;
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107 if ((half_byte & 0x8) == 0)
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108 {
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109 if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4))
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110 result |= - (HOST_WIDE_INT_1U << shift);
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111
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112 return result;
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113 }
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114 }
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115 }
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