gcc/data-streamer-out.c

   1 /* Routines for saving various data types to a file stream.  This deals
   2    with various data types like strings, integers, enums, etc.
   3
   4    Copyright (C) 2011-2013 Free Software Foundation, Inc.
   5    Contributed by Diego Novillo <dnovillo@google.com>
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "data-streamer.h"
  27
  28 /* Return index used to reference STRING of LEN characters in the string table
  29    in OB.  The string might or might not include a trailing '\0'.
  30    Then put the index onto the INDEX_STREAM.
  31    When PERSISTENT is set, the string S is supposed to not change during
  32    duration of the OB and thus OB can keep pointer into it.  */
  33
  34 unsigned
  35 streamer_string_index (struct output_block *ob, const char *s, unsigned int len,
  36                        bool persistent)
  37 {
  38   struct string_slot **slot;
  39   struct string_slot s_slot;
  40
  41   s_slot.s = s;
  42   s_slot.len = len;
  43   s_slot.slot_num = 0;
  44
  45   slot = ob->string_hash_table.find_slot (&s_slot, INSERT);
  46   if (*slot == NULL)
  47     {
  48       struct lto_output_stream *string_stream = ob->string_stream;
  49       unsigned int start = string_stream->total_size;
  50       struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot);
  51       const char *string;
  52
  53       if (!persistent)
  54         {
  55           char *tmp;
  56           string = tmp = XOBNEWVEC (&ob->obstack, char, len);
  57           memcpy (tmp, s, len);
  58         }
  59       else
  60         string = s;
  61
  62       new_slot->s = string;
  63       new_slot->len = len;
  64       new_slot->slot_num = start;
  65       *slot = new_slot;
  66       streamer_write_uhwi_stream (string_stream, len);
  67       lto_output_data_stream (string_stream, string, len);
  68       return start + 1;
  69     }
  70   else
  71     {
  72       struct string_slot *old_slot = *slot;
  73       return old_slot->slot_num + 1;
  74     }
  75 }
  76
  77
  78 /* Output STRING of LEN characters to the string table in OB. The
  79    string might or might not include a trailing '\0'. Then put the
  80    index onto the INDEX_STREAM.
  81    When PERSISTENT is set, the string S is supposed to not change during
  82    duration of the OB and thus OB can keep pointer into it.  */
  83
  84 void
  85 streamer_write_string_with_length (struct output_block *ob,
  86                                    struct lto_output_stream *index_stream,
  87                                    const char *s, unsigned int len,
  88                                    bool persistent)
  89 {
  90   if (s)
  91     streamer_write_uhwi_stream (index_stream,
  92                                 streamer_string_index (ob, s, len, persistent));
  93   else
  94     streamer_write_char_stream (index_stream, 0);
  95 }
  96
  97
  98 /* Output the '\0' terminated STRING to the string
  99    table in OB.  Then put the index onto the INDEX_STREAM.
 100    When PERSISTENT is set, the string S is supposed to not change during
 101    duration of the OB and thus OB can keep pointer into it.  */
 102
 103 void
 104 streamer_write_string (struct output_block *ob,
 105                        struct lto_output_stream *index_stream,
 106                        const char *string, bool persistent)
 107 {
 108   if (string)
 109     streamer_write_string_with_length (ob, index_stream, string,
 110                                        strlen (string) + 1,
 111                                        persistent);
 112   else
 113     streamer_write_char_stream (index_stream, 0);
 114 }
 115
 116
 117 /* Output STRING of LEN characters to the string table in OB.  Then
 118    put the index into BP.
 119    When PERSISTENT is set, the string S is supposed to not change during
 120    duration of the OB and thus OB can keep pointer into it.  */
 121
 122 void
 123 bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp,
 124                             const char *s, unsigned int len, bool persistent)
 125 {
 126   unsigned index = 0;
 127   if (s)
 128     index = streamer_string_index (ob, s, len, persistent);
 129   bp_pack_var_len_unsigned (bp, index);
 130 }
 131
 132
 133 /* Output the '\0' terminated STRING to the string
 134    table in OB.  Then put the index onto the bitpack BP.
 135    When PERSISTENT is set, the string S is supposed to not change during
 136    duration of the OB and thus OB can keep pointer into it.  */
 137
 138 void
 139 bp_pack_string (struct output_block *ob, struct bitpack_d *bp,
 140                 const char *s, bool persistent)
 141 {
 142   unsigned index = 0;
 143   if (s)
 144     index = streamer_string_index (ob, s, strlen (s) + 1, persistent);
 145   bp_pack_var_len_unsigned (bp, index);
 146 }
 147
 148
 149
 150 /* Write a zero to the output stream.  */
 151
 152 void
 153 streamer_write_zero (struct output_block *ob)
 154 {
 155   streamer_write_char_stream (ob->main_stream, 0);
 156 }
 157
 158
 159 /* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream.  */
 160
 161 void
 162 streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work)
 163 {
 164   streamer_write_uhwi_stream (ob->main_stream, work);
 165 }
 166
 167
 168 /* Write a HOST_WIDE_INT value WORK to OB->main_stream.  */
 169
 170 void
 171 streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work)
 172 {
 173   streamer_write_hwi_stream (ob->main_stream, work);
 174 }
 175
 176 /* Write a gcov counter value WORK to OB->main_stream.  */
 177
 178 void
 179 streamer_write_gcov_count (struct output_block *ob, gcov_type work)
 180 {
 181   streamer_write_gcov_count_stream (ob->main_stream, work);
 182 }
 183
 184 /* Write an unsigned HOST_WIDE_INT value WORK to OBS.  */
 185
 186 void
 187 streamer_write_uhwi_stream (struct lto_output_stream *obs,
 188                             unsigned HOST_WIDE_INT work)
 189 {
 190   do
 191     {
 192       unsigned int byte = (work & 0x7f);
 193       work >>= 7;
 194       if (work != 0)
 195         /* More bytes to follow.  */
 196         byte |= 0x80;
 197
 198       streamer_write_char_stream (obs, byte);
 199     }
 200   while (work != 0);
 201 }
 202
 203
 204 /* Write a HOST_WIDE_INT value WORK to OBS.  */
 205
 206 void
 207 streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)
 208 {
 209   int more, byte;
 210
 211   do
 212     {
 213       byte = (work & 0x7f);
 214       /* arithmetic shift */
 215       work >>= 7;
 216       more = !((work == 0 && (byte & 0x40) == 0)
 217                || (work == -1 && (byte & 0x40) != 0));
 218       if (more)
 219         byte |= 0x80;
 220
 221       streamer_write_char_stream (obs, byte);
 222     }
 223   while (more);
 224 }
 225
 226 /* Write a GCOV counter value WORK to OBS.  */
 227
 228 void
 229 streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work)
 230 {
 231   gcc_assert (work >= 0);
 232   gcc_assert ((HOST_WIDE_INT) work == work);
 233   streamer_write_hwi_stream (obs, work);
 234 }