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1 #!/usr/bin/perl -w
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2
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3 # Copyright (C) 2010-2020 Free Software Foundation, Inc.
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111
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4 #
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5 # This file is part of the GNU ISO C++ Library. This library is free
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6 # software; you can redistribute it and/or modify it under the
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7 # terms of the GNU General Public License as published by the
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8 # Free Software Foundation; either version 3, or (at your option)
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9 # any later version.
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10 #
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11 # This library is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU General Public License for more details.
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15 #
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16 # You should have received a copy of the GNU General Public License along
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17 # with this library; see the file COPYING3. If not see
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18 # <http://www.gnu.org/licenses/>.
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19
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20 # Extract symbol version information on Solaris 2.
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21 #
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22 # Sun ld doesn't record symbol versions in .dynsym entries and they cannot
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23 # easily be extracted from readelf --versions output, so use pvs instead.
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24 # This way, we don't require GNU binutils in the native case. Also ensures
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25 # that baseline_symbols.txt is identical between native (pvs, elfdump) and
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26 # cross (readelf) cases.
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27
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28 my $lib = shift;
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29
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30 open PVS, "pvs -dsvo $lib |" or die $!;
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31 while (<PVS>) {
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32 chomp;
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33
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34 # Remove trailing semicolon.
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35 s/;$//;
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36
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37 # shared object, dash, version, symbol, [size]
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38 (undef, undef, $version, $symbol, $size) = split;
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39
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40 # Remove colon separator from version field.
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41 $version =~ s/:$//;
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42
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43 # Record base version. The [BASE] field was only added in Solaris 11,
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44 # so simply use the first record instead.
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45 if ($. == 1) {
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46 $basever = $version;
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47 next;
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48 }
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49
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50 # Skip version declarations.
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51 next unless defined ($symbol);
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52
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53 # Ignore version dependencies.
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54 next if ($symbol =~ /\{.*\}/);
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55
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56 # Emit objects.
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57 if (defined ($size)) {
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58 # Strip parens from object size.
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59 $size =~ s/\((\d+)\)/$1/;
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60
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61 $type{$symbol} = "OBJECT";
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62 $version{$symbol} = $version;
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63 $size{$symbol} = $size;
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64 next;
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65 }
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66
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67 if ($version eq $symbol or $version eq $basever) {
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68 # Emit versions or symbols bound to base versions as objects.
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69 $type{$symbol} = "OBJECT";
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70 if ($version eq $basever) {
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71 $version{$symbol} = $version;
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72 } else {
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73 $version{$symbol} = $symbol;
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74 }
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75 $size{$symbol} = 0;
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76 } else {
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77 # Everything else without a size field is a function.
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78 $type{$symbol} = "FUNC";
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79 $version{$symbol} = $version;
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80 }
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81 }
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82 close PVS or die "pvs error";
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83
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84 # Only look at .dynsym table, like readelf in extract_symvers.
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85 # Ignore error output to avoid getting confused by
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86 # .gnu.version_r: zero sh_entsize information, expected 0x1
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87 # warning with Solaris 11 elfdump on gld-produced shared objects.
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88 open ELFDUMP, "/usr/ccs/bin/elfdump -s -N .dynsym $lib 2>/dev/null |" or die $!;
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89 while (<ELFDUMP>) {
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90 chomp;
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91
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92 # Ignore empty lines.
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93 next if (/^$/);
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94
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95 # Ignore object name header.
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96 next if (/:$/);
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97
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98 # Ignore table header lines.
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99 next if (/^Symbol Table Section:/);
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100 next if (/index.*value.*size/);
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101
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102 # Split table.
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103 (undef, undef, undef, $type, $bind, $oth, undef, $shndx, $name) = split;
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104
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105 # Error out for unknown input.
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106 die "unknown input line:\n$_" unless defined($bind);
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107
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108 # Ignore local symbols.
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109 next if ($bind eq "LOCL");
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110 # Ignore hidden symbols.
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111 next if ($oth eq "H");
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112 # Ignore undefined symbols.
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113 next if ($shndx eq "UNDEF");
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114 # Error out for unhandled cases. _GLOBAL_OFFSET_TABLE_ is P (protected).
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115 die "unhandled symbol:\n$_" if ($bind !~ /^(GLOB|WEAK)/ or $oth !~ /[DP]/);
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116
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117 # Adapt to readelf type naming convention.
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118 $type = "NOTYPE" if ($type eq "NOTY");
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119 $type = "OBJECT" if ($type eq "OBJT");
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120
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121 # Use correct symbol type.
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122 $type{$name} = $type if ($type{$name} ne $type);
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123 }
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124 close ELFDUMP or die "elfdump error";
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125
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126 foreach $symbol (keys %type) {
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127 if ($type{$symbol} eq "FUNC" || $type{$symbol} eq "NOTYPE") {
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128 push @lines, "$type{$symbol}:$symbol\@\@$version{$symbol}\n";
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129 } elsif ($type{$symbol} eq "OBJECT" and $size{$symbol} == 0) {
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130 # Omit symbols bound to base version; details can differ depending
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131 # on the toolchain used.
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132 next if $version{$symbol} eq $basever;
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133
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134 push @lines, "$type{$symbol}:$size{$symbol}:$version{$symbol}\n";
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135 } else {
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136 push @lines, "$type{$symbol}:$size{$symbol}:$symbol\@\@$version{$symbol}\n";
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137 }
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138 }
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139 print sort @lines;
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