1# Generate an ELF symbol version map a-la Solaris and GNU ld. 2# Copyright (C) 2007-2022 Free Software Foundation, Inc. 3# Contributed by Richard Henderson <rth@cygnus.com> 4# 5# This file is part of GCC. 6# 7# GCC is free software; you can redistribute it and/or modify it under 8# the terms of the GNU General Public License as published by the Free 9# Software Foundation; either version 3, or (at your option) any later 10# version. 11# 12# GCC is distributed in the hope that it will be useful, but WITHOUT 13# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15# License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with GCC; see the file COPYING3. If not see 19# <http://www.gnu.org/licenses/>. 20 21BEGIN { 22 state = "nm"; 23 sawsymbol = 0; 24 if (leading_underscore) 25 prefix = "_"; 26 else 27 prefix = ""; 28} 29 30# Remove comment and blank lines. 31/^ *#/ || /^ *$/ { 32 next; 33} 34 35# We begin with nm input. Collect the set of symbols that are present 36# so that we cannot emit them into the final version script -- Solaris 37# complains at us if we do. 38 39state == "nm" && /^%%/ { 40 state = "ver"; 41 next; 42} 43 44state == "nm" && ($1 == "U" || $2 == "U") { 45 next; 46} 47 48state == "nm" && NF == 3 { 49 split ($3, s, "@") 50 if (skip_underscore && substr(s[1], 1, 1) == "_") 51 symname = substr(s[1], 2); 52 else 53 symname = s[1]; 54 def[symname] = 1; 55 sawsymbol = 1; 56 next; 57} 58 59state == "nm" { 60 next; 61} 62 63# Now we process a simplified variant of the Solaris symbol version 64# script. We have one symbol per line, no semicolons, simple markers 65# for beginning and ending each section, and %inherit markers for 66# describing version inheritance. A symbol may appear in more than 67# one symbol version, and the last seen takes effect. 68# The magic version name '%exclude' causes all the symbols given that 69# version to be dropped from the output (unless a later version overrides). 70 71NF == 3 && $1 == "%inherit" { 72 inherit[$2] = $3; 73 next; 74} 75 76NF == 2 && $2 == "{" { 77 if ($1 != "%exclude") 78 libs[$1] = 1; 79 thislib = $1; 80 next; 81} 82 83$1 == "}" { 84 thislib = ""; 85 next; 86} 87 88{ 89 sym = prefix $1; 90 symbols[sym] = 1 91 if (thislib != "%exclude") 92 ver[sym, thislib] = 1; 93 else { 94 for (l in libs) 95 ver[sym, l] = 0; 96 } 97 next; 98} 99 100END { 101 if (!sawsymbol) 102 { 103 print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2"; 104 exit 1; 105 } 106 for (l in libs) 107 output(l); 108} 109 110function output(lib) { 111 if (done[lib]) 112 return; 113 done[lib] = 1; 114 if (inherit[lib]) 115 output(inherit[lib]); 116 117 empty=1 118 for (sym in symbols) 119 if ((ver[sym, lib] != 0) && (sym in def)) 120 { 121 if (empty) 122 { 123 printf("%s {\n", lib); 124 printf(" global:\n"); 125 empty = 0; 126 } 127 printf("\t%s;\n", sym); 128 } 129 130 if (empty) 131 { 132 for (l in libs) 133 if (inherit[l] == lib) 134 inherit[l] = inherit[lib]; 135 } 136 else if (inherit[lib]) 137 printf("} %s;\n", inherit[lib]); 138 else 139 printf ("\n local:\n\t*;\n};\n"); 140} 141