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1 # Generate an ELF symbol version map a-la Solaris and GNU ld.
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145
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2 # Copyright (C) 2007-2020 Free Software Foundation, Inc.
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3 # Contributed by Richard Henderson <rth@cygnus.com>
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4 #
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5 # This file is part of GCC.
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6 #
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7 # GCC is free software; you can redistribute it and/or modify it under
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8 # the terms of the GNU General Public License as published by the Free
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9 # Software Foundation; either version 3, or (at your option) any later
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10 # version.
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11 #
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12 # GCC is distributed in the hope that it will be useful, but WITHOUT
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13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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14 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 # License for more details.
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16 #
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17 # You should have received a copy of the GNU General Public License
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18 # along with GCC; see the file COPYING3. If not see
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19 # <http://www.gnu.org/licenses/>.
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20
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21 BEGIN {
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22 state = "nm";
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23 sawsymbol = 0;
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24 if (leading_underscore)
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25 prefix = "_";
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26 else
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27 prefix = "";
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28 }
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29
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30 # Remove comment and blank lines.
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31 /^ *#/ || /^ *$/ {
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32 next;
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33 }
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34
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35 # We begin with nm input. Collect the set of symbols that are present
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36 # so that we cannot emit them into the final version script -- Solaris
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37 # complains at us if we do.
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38
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39 state == "nm" && /^%%/ {
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40 state = "ver";
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41 next;
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42 }
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43
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44 state == "nm" && ($1 == "U" || $2 == "U") {
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45 next;
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46 }
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47
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48 state == "nm" && NF == 3 {
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49 split ($3, s, "@")
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50 if (skip_underscore && substr(s[1], 1, 1) == "_")
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51 symname = substr(s[1], 2);
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52 else
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53 symname = s[1];
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54 def[symname] = 1;
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55 sawsymbol = 1;
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56 next;
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57 }
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58
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59 state == "nm" {
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60 next;
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61 }
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62
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63 # Now we process a simplified variant of the Solaris symbol version
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64 # script. We have one symbol per line, no semicolons, simple markers
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65 # for beginning and ending each section, and %inherit markers for
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66 # describing version inheritance. A symbol may appear in more than
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67 # one symbol version, and the last seen takes effect.
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68 # The magic version name '%exclude' causes all the symbols given that
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69 # version to be dropped from the output (unless a later version overrides).
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70
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71 NF == 3 && $1 == "%inherit" {
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72 inherit[$2] = $3;
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73 next;
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74 }
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75
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76 NF == 2 && $2 == "{" {
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77 if ($1 != "%exclude")
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78 libs[$1] = 1;
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79 thislib = $1;
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80 next;
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81 }
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82
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83 $1 == "}" {
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84 thislib = "";
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85 next;
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86 }
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87
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88 {
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89 sym = prefix $1;
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90 symbols[sym] = 1
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91 if (thislib != "%exclude")
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92 ver[sym, thislib] = 1;
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93 else {
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94 for (l in libs)
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95 ver[sym, l] = 0;
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96 }
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97 next;
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98 }
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99
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100 END {
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101 if (!sawsymbol)
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102 {
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103 print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
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104 exit 1;
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105 }
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106 for (l in libs)
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107 output(l);
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108 }
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109
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110 function output(lib) {
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111 if (done[lib])
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112 return;
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113 done[lib] = 1;
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114 if (inherit[lib])
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115 output(inherit[lib]);
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116
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117 empty=1
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118 for (sym in symbols)
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119 if ((ver[sym, lib] != 0) && (sym in def))
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120 {
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121 if (empty)
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122 {
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123 printf("%s {\n", lib);
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124 printf(" global:\n");
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125 empty = 0;
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126 }
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127 printf("\t%s;\n", sym);
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128 }
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129
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130 if (empty)
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131 {
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132 for (l in libs)
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133 if (inherit[l] == lib)
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134 inherit[l] = inherit[lib];
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135 }
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136 else if (inherit[lib])
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137 printf("} %s;\n", inherit[lib]);
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138 else
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139 printf ("\n local:\n\t*;\n};\n");
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140 }
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