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 2011 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 = (struct string_slot **) htab_find_slot (ob->string_hash_table, 46 &s_slot, INSERT); 47 if (*slot == NULL) 48 { 49 struct lto_output_stream *string_stream = ob->string_stream; 50 unsigned int start = string_stream->total_size; 51 struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot); 52 const char *string; 53 54 if (!persistent) 55 { 56 char *tmp; 57 string = tmp = XOBNEWVEC (&ob->obstack, char, len); 58 memcpy (tmp, s, len); 59 } 60 else 61 string = s; 62 63 new_slot->s = string; 64 new_slot->len = len; 65 new_slot->slot_num = start; 66 *slot = new_slot; 67 streamer_write_uhwi_stream (string_stream, len); 68 lto_output_data_stream (string_stream, string, len); 69 return start + 1; 70 } 71 else 72 { 73 struct string_slot *old_slot = *slot; 74 return old_slot->slot_num + 1; 75 } 76 } 77 78 79 /* Output STRING of LEN characters to the string table in OB. The 80 string might or might not include a trailing '\0'. Then put the 81 index onto the INDEX_STREAM. 82 When PERSISTENT is set, the string S is supposed to not change during 83 duration of the OB and thus OB can keep pointer into it. */ 84 85 void 86 streamer_write_string_with_length (struct output_block *ob, 87 struct lto_output_stream *index_stream, 88 const char *s, unsigned int len, 89 bool persistent) 90 { 91 if (s) 92 streamer_write_uhwi_stream (index_stream, 93 streamer_string_index (ob, s, len, persistent)); 94 else 95 streamer_write_char_stream (index_stream, 0); 96 } 97 98 99 /* Output the '\0' terminated STRING to the string 100 table in OB. Then put the index onto the INDEX_STREAM. 101 When PERSISTENT is set, the string S is supposed to not change during 102 duration of the OB and thus OB can keep pointer into it. */ 103 104 void 105 streamer_write_string (struct output_block *ob, 106 struct lto_output_stream *index_stream, 107 const char *string, bool persistent) 108 { 109 if (string) 110 streamer_write_string_with_length (ob, index_stream, string, 111 strlen (string) + 1, 112 persistent); 113 else 114 streamer_write_char_stream (index_stream, 0); 115 } 116 117 118 /* Write a zero to the output stream. */ 119 120 void 121 streamer_write_zero (struct output_block *ob) 122 { 123 streamer_write_char_stream (ob->main_stream, 0); 124 } 125 126 127 /* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream. */ 128 129 void 130 streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work) 131 { 132 streamer_write_uhwi_stream (ob->main_stream, work); 133 } 134 135 136 /* Write a HOST_WIDE_INT value WORK to OB->main_stream. */ 137 138 void 139 streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work) 140 { 141 streamer_write_hwi_stream (ob->main_stream, work); 142 } 143 144 145 /* Write an unsigned HOST_WIDE_INT value WORK to OBS. */ 146 147 void 148 streamer_write_uhwi_stream (struct lto_output_stream *obs, 149 unsigned HOST_WIDE_INT work) 150 { 151 do 152 { 153 unsigned int byte = (work & 0x7f); 154 work >>= 7; 155 if (work != 0) 156 /* More bytes to follow. */ 157 byte |= 0x80; 158 159 streamer_write_char_stream (obs, byte); 160 } 161 while (work != 0); 162 } 163 164 165 /* Write a HOST_WIDE_INT value WORK to OBS. */ 166 167 void 168 streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work) 169 { 170 int more, byte; 171 172 do 173 { 174 byte = (work & 0x7f); 175 /* arithmetic shift */ 176 work >>= 7; 177 more = !((work == 0 && (byte & 0x40) == 0) 178 || (work == -1 && (byte & 0x40) != 0)); 179 if (more) 180 byte |= 0x80; 181 182 streamer_write_char_stream (obs, byte); 183 } 184 while (more); 185 } 186