gcc/d/d-port.cc

   1 /* d-port.cc -- D frontend interface to the gcc back-end.
   2    Copyright (C) 2013-2022 Free Software Foundation, Inc.
   3
   4 GCC is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 3, or (at your option)
   7 any later version.
   8
   9 GCC is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with GCC; see the file COPYING3.  If not see
  16 <http://www.gnu.org/licenses/>.  */
  17
  18 #include "config.h"
  19 #include "system.h"
  20 #include "coretypes.h"
  21
  22 #include "dmd/root/port.h"
  23 #include "dmd/target.h"
  24
  25 #include "tree.h"
  26
  27
  28 /* Implements the Port interface defined by the frontend.
  29    A mini library for doing compiler/system specific things.  */
  30
  31 /* Compare the first N bytes of S1 and S2 without regard to the case.  */
  32
  33 int
  34 Port::memicmp (const char *s1, const char *s2, size_t n)
  35 {
  36   int result = 0;
  37
  38   for (size_t i = 0; i < n; i++)
  39     {
  40       char c1 = s1[i];
  41       char c2 = s2[i];
  42
  43       result = c1 - c2;
  44       if (result)
  45         {
  46           result = TOUPPER (c1) - TOUPPER (c2);
  47           if (result)
  48             break;
  49         }
  50     }
  51
  52   return result;
  53 }
  54
  55 /* Convert all characters in S to uppercase.  */
  56
  57 char *
  58 Port::strupr (char *s)
  59 {
  60   char *t = s;
  61
  62   while (*s)
  63     {
  64       *s = TOUPPER (*s);
  65       s++;
  66     }
  67
  68   return t;
  69 }
  70
  71 /* Return true if the real_t value from string BUFFER overflows
  72    as a result of rounding down to float mode.  */
  73
  74 bool
  75 Port::isFloat32LiteralOutOfRange (const char *buffer)
  76 {
  77   real_t r;
  78
  79   real_from_string3 (&r.rv (), buffer, TYPE_MODE (float_type_node));
  80
  81   return r == target.RealProperties.infinity;
  82 }
  83
  84 /* Return true if the real_t value from string BUFFER overflows
  85    as a result of rounding down to double mode.  */
  86
  87 bool
  88 Port::isFloat64LiteralOutOfRange (const char *buffer)
  89 {
  90   real_t r;
  91
  92   real_from_string3 (&r.rv (), buffer, TYPE_MODE (double_type_node));
  93
  94   return r == target.RealProperties.infinity;
  95 }
  96
  97 /* Fetch a little-endian 16-bit value from BUFFER.  */
  98
  99 unsigned
 100 Port::readwordLE (const void *buffer)
 101 {
 102   const unsigned char *p = (const unsigned char *) buffer;
 103
 104   return ((unsigned) p[1] << 8) | (unsigned) p[0];
 105 }
 106
 107 /* Fetch a big-endian 16-bit value from BUFFER.  */
 108
 109 unsigned
 110 Port::readwordBE (const void *buffer)
 111 {
 112   const unsigned char *p = (const unsigned char *) buffer;
 113
 114   return ((unsigned) p[0] << 8) | (unsigned) p[1];
 115 }
 116
 117 /* Fetch a little-endian 32-bit value from BUFFER.  */
 118
 119 unsigned
 120 Port::readlongLE (const void *buffer)
 121 {
 122   const unsigned char *p = (const unsigned char *) buffer;
 123
 124   return (((unsigned) p[3] << 24)
 125           | ((unsigned) p[2] << 16)
 126           | ((unsigned) p[1] << 8)
 127           | (unsigned) p[0]);
 128 }
 129
 130 /* Fetch a big-endian 32-bit value from BUFFER.  */
 131
 132 unsigned
 133 Port::readlongBE (const void *buffer)
 134 {
 135   const unsigned char *p = (const unsigned char *) buffer;
 136
 137   return (((unsigned) p[0] << 24)
 138           | ((unsigned) p[1] << 16)
 139           | ((unsigned) p[2] << 8)
 140           | (unsigned) p[3]);
 141 }
 142
 143 /* Write an SZ-byte sized VALUE to BUFFER, ignoring endian-ness.  */
 144
 145 void
 146 Port::valcpy (void *buffer, uint64_t value, size_t sz)
 147 {
 148   gcc_assert (((size_t) buffer) % sz == 0);
 149
 150   switch (sz)
 151     {
 152     case 1:
 153       *(uint8_t *) buffer = (uint8_t) value;
 154       break;
 155
 156     case 2:
 157       *(uint16_t *) buffer = (uint16_t) value;
 158       break;
 159
 160     case 4:
 161       *(uint32_t *) buffer = (uint32_t) value;
 162       break;
 163
 164     case 8:
 165       *(uint64_t *) buffer = (uint64_t) value;
 166       break;
 167
 168     default:
 169       gcc_unreachable ();
 170     }
 171 }