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111
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1 /* Routines for restoring various data types from a file stream. This deals
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2 with various data types like strings, integers, enums, etc.
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3
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131
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4 Copyright (C) 2011-2018 Free Software Foundation, Inc.
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111
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5 Contributed by Diego Novillo <dnovillo@google.com>
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 #include "config.h"
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24 #include "system.h"
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25 #include "coretypes.h"
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26 #include "backend.h"
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27 #include "tree.h"
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28 #include "gimple.h"
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29 #include "cgraph.h"
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30 #include "data-streamer.h"
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31
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32 /* Read a string from the string table in DATA_IN using input block
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33 IB. Write the length to RLEN. */
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34
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35 static const char *
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36 string_for_index (struct data_in *data_in, unsigned int loc, unsigned int *rlen)
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37 {
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38 unsigned int len;
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39 const char *result;
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40
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41 if (!loc)
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42 {
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43 *rlen = 0;
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44 return NULL;
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45 }
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46
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47 /* Get the string stored at location LOC in DATA_IN->STRINGS. */
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48 lto_input_block str_tab (data_in->strings, loc - 1, data_in->strings_len, NULL);
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49 len = streamer_read_uhwi (&str_tab);
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50 *rlen = len;
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51
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52 if (str_tab.p + len > data_in->strings_len)
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53 internal_error ("bytecode stream: string too long for the string table");
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54
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55 result = (const char *)(data_in->strings + str_tab.p);
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56
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57 return result;
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58 }
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59
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60
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61 /* Read a string from the string table in DATA_IN using input block
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62 IB. Write the length to RLEN. */
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63
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64 const char *
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65 streamer_read_indexed_string (struct data_in *data_in,
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66 struct lto_input_block *ib, unsigned int *rlen)
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67 {
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68 return string_for_index (data_in, streamer_read_uhwi (ib), rlen);
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69 }
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70
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71
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72 /* Read a NULL terminated string from the string table in DATA_IN. */
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73
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74 const char *
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75 streamer_read_string (struct data_in *data_in, struct lto_input_block *ib)
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76 {
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77 unsigned int len;
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78 const char *ptr;
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79
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80 ptr = streamer_read_indexed_string (data_in, ib, &len);
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81 if (!ptr)
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82 return NULL;
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83 if (ptr[len - 1] != '\0')
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84 internal_error ("bytecode stream: found non-null terminated string");
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85
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86 return ptr;
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87 }
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88
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89
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90 /* Read a string from the string table in DATA_IN using the bitpack BP.
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91 Write the length to RLEN. */
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92
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93 const char *
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94 bp_unpack_indexed_string (struct data_in *data_in,
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95 struct bitpack_d *bp, unsigned int *rlen)
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96 {
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97 return string_for_index (data_in, bp_unpack_var_len_unsigned (bp), rlen);
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98 }
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99
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100
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101 /* Read a NULL terminated string from the string table in DATA_IN. */
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102
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103 const char *
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104 bp_unpack_string (struct data_in *data_in, struct bitpack_d *bp)
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105 {
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106 unsigned int len;
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107 const char *ptr;
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108
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109 ptr = bp_unpack_indexed_string (data_in, bp, &len);
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110 if (!ptr)
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111 return NULL;
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112 if (ptr[len - 1] != '\0')
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113 internal_error ("bytecode stream: found non-null terminated string");
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114
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115 return ptr;
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116 }
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117
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118
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119 /* Read an unsigned HOST_WIDE_INT number from IB. */
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120
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121 unsigned HOST_WIDE_INT
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122 streamer_read_uhwi (struct lto_input_block *ib)
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123 {
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124 unsigned HOST_WIDE_INT result;
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125 int shift;
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126 unsigned HOST_WIDE_INT byte;
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127 unsigned int p = ib->p;
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128 unsigned int len = ib->len;
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129
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130 const char *data = ib->data;
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131 result = data[p++];
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132 if ((result & 0x80) != 0)
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133 {
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134 result &= 0x7f;
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135 shift = 7;
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136 do
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137 {
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138 byte = data[p++];
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139 result |= (byte & 0x7f) << shift;
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140 shift += 7;
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141 }
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142 while ((byte & 0x80) != 0);
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143 }
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144
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145 /* We check for section overrun after the fact for performance reason. */
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146 if (p > len)
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147 lto_section_overrun (ib);
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148
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149 ib->p = p;
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150 return result;
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151 }
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152
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153
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154 /* Read a HOST_WIDE_INT number from IB. */
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155
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156 HOST_WIDE_INT
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157 streamer_read_hwi (struct lto_input_block *ib)
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158 {
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159 HOST_WIDE_INT result = 0;
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160 int shift = 0;
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161 unsigned HOST_WIDE_INT byte;
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162
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163 while (true)
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164 {
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165 byte = streamer_read_uchar (ib);
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166 result |= (byte & 0x7f) << shift;
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167 shift += 7;
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168 if ((byte & 0x80) == 0)
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169 {
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170 if ((shift < HOST_BITS_PER_WIDE_INT) && (byte & 0x40))
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171 result |= - (HOST_WIDE_INT_1U << shift);
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172
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173 return result;
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174 }
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175 }
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176 }
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177
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178 /* Read gcov_type value from IB. */
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179
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180 gcov_type
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181 streamer_read_gcov_count (struct lto_input_block *ib)
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182 {
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183 gcov_type ret = streamer_read_hwi (ib);
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184 return ret;
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185 }
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186
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187 /* Read the physical representation of a wide_int val from
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188 input block IB. */
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189
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190 wide_int
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191 streamer_read_wide_int (struct lto_input_block *ib)
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192 {
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193 HOST_WIDE_INT a[WIDE_INT_MAX_ELTS];
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194 int i;
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195 int prec = streamer_read_uhwi (ib);
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196 int len = streamer_read_uhwi (ib);
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197 for (i = 0; i < len; i++)
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198 a[i] = streamer_read_hwi (ib);
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199 return wide_int::from_array (a, len, prec);
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200 }
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201
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202 /* Read the physical representation of a widest_int val from
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203 input block IB. */
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204
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205 widest_int
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206 streamer_read_widest_int (struct lto_input_block *ib)
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207 {
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208 HOST_WIDE_INT a[WIDE_INT_MAX_ELTS];
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209 int i;
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210 int prec ATTRIBUTE_UNUSED = streamer_read_uhwi (ib);
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211 int len = streamer_read_uhwi (ib);
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212 for (i = 0; i < len; i++)
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213 a[i] = streamer_read_hwi (ib);
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214 return widest_int::from_array (a, len);
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215 }
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216
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