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# Generate macros that control the symbol versions of the public
# library API, from a .map.in file.
#
# Written by Zack Weinberg <zackw at panix.com> in 2017.
# To the extent possible under law, Zack Weinberg has waived all
# copyright and related or neighboring rights to this work.
#
# See https://creativecommons.org/publicdomain/zero/1.0/ for further
# details.
# The .map.in file is the first input file, and we expect the Makefile
# to have set the variables SYMVER_MIN, SYMVER_FLOOR, and COMPAT_ABI.
# See libcrypt.map.in and gen-vers.awk for explanations of the format
# of .map.in files. See crypt-port.h for an explanation of how to use
# the macros generated by this program.
#
# Note: if you change the format of .map.in files you probably need to
# update gen-map.awk too.
#
# Note: we currently don't support compatibility symbols that need
# a different definition from the default version.
BEGIN {
split("", SYMBOLS) # ensure SYMBOLS is an array
split("", VCHAIN) # ditto VCHAIN
NVCHAIN = 0
# This arranges for sorted output if gawk is in use, and is
# harmless otherwise.
PROCINFO["sorted_in"] = "@ind_str_asc"
}
NF == 0 { next } # blank line, discard
$1 == "#" { next } # comment, discard
$1 == "%chain" {
for (i = 2; i <= NF; i++) {
VCHAIN[++NVCHAIN] = $i
}
next
}
{
if ($2 == "-") {
compat_only[$1] = 1
} else {
compat_only[$1] = 0
if ($2 in SYMBOLS) {
SYMBOLS[$2] = SYMBOLS[$2] SUBSEP $1
} else {
SYMBOLS[$2] = $1
}
}
for (i = 3; i <= NF; i++) {
sym=$i
n=split(sym, a, ":")
if (n > 1) {
sym=""
for (j = 2; j <= n; j++) {
if (COMPAT_ABI == "yes" || COMPAT_ABI == a[j]) {
sym=a[1]
}
}
}
if (sym != "") {
if (sym in SYMBOLS) {
SYMBOLS[sym] = SYMBOLS[sym] SUBSEP $1
} else {
SYMBOLS[sym] = $1
}
}
}
}
END {
if (NVCHAIN == 0) {
print ARGV[1] ": error: missing %chain directive" > "/dev/stderr"
close("/dev/stderr")
exit 1
}
symver_min_idx = 0
symver_floor_idx = 0
for (i = 1; i <= NVCHAIN; i++) {
if (VCHAIN[i] == SYMVER_MIN) {
symver_min_idx = i
}
if (VCHAIN[i] == SYMVER_FLOOR) {
symver_floor_idx = i
}
}
if (symver_min_idx == 0) {
print ARGV[1] ": error: SYMVER_MIN (" SYMVER_MIN ") " \
"not found in %chain directives" > "/dev/stderr"
close("/dev/stderr")
exit 1
}
if (symver_floor_idx == 0) {
print ARGV[1] ": error: SYMVER_FLOOR (" SYMVER_FLOOR ") " \
"not found in %chain directives" > "/dev/stderr"
close("/dev/stderr")
exit 1
}
if (symver_floor_idx < symver_min_idx) {
print ARGV[1] ": error: SYMVER_FLOOR (" SYMVER_FLOOR ") " \
"is lower than SYMVER_MIN (" SYMVER_MIN ")" > "/dev/stderr"
close("/dev/stderr")
exit 1
}
# Construct a pruned set of symbols and versions, including only
# versions with symbols, discarding all symbols associated with
# versions below SYMVER_MIN, raising symbols below SYMVER_FLOOR to
# SYMVER_FLOOR, and removing duplicates.
# Note: unlike in gen-map.awk, symbols all of whose versions are
# below SYMVER_MIN must still be counted in 'allsyms' so their
# INCLUDE macros are generated.
for (i = 1; i <= NVCHAIN; i++) {
v = VCHAIN[i]
if (v in SYMBOLS) {
nsyms = split(SYMBOLS[v], syms, SUBSEP)
j = i;
if (j < symver_floor_idx)
j = symver_floor_idx;
vr = VCHAIN[j]
for (s = 1; s <= nsyms; s++) {
if (syms[s]) {
allsyms[syms[s]] = 1
if (i >= symver_min_idx) {
symset[vr, syms[s]] = 1
}
}
}
}
}
print "/* Generated from " ARGV[1] " by gen-vers.awk. DO NOT EDIT. */"
print ""
print "#ifndef _CRYPT_SYMBOL_VERS_H"
print "#define _CRYPT_SYMBOL_VERS_H 1"
print ""
print "/* For each public symbol <sym>, INCLUDE_<sym> is true if it"
print " has any versions above the backward compatibility minimum."
print " Compatibility-only symbols are not included in the static"
print " library, or in the shared library when configured with"
print " --disable-obsolete-api. */"
print "#if defined PIC && ENABLE_OBSOLETE_API"
print ""
for (sym in allsyms) {
include = 0
for (i = symver_floor_idx; i <= NVCHAIN; i++) {
if ((VCHAIN[i], sym) in symset) {
include++
}
}
includesym[sym] = include
printf("#define INCLUDE_%s %d\n", sym, include)
}
print ""
print "#else"
print ""
for (sym in allsyms) {
printf("#define INCLUDE_%s %d\n", sym,
(includesym[sym] && !compat_only[sym]))
}
print ""
print "#endif"
print ""
print "/* For each public symbol <sym> that is included, define its"
print " highest version as the default, and aliases at each"
print " compatibility version. */"
for (sym in allsyms) {
if (includesym[sym]) {
seq = 0
for (i = NVCHAIN; i >= symver_floor_idx; i--) {
v = VCHAIN[i]
if ((v, sym) in symset) {
if (seq == 0) {
if (compat_only[sym] || includesym[sym] > 0) {
printf("#ifdef PIC\n#define %s _crypt_%s\n#endif\n",
sym, sym);
}
printf("#define SYMVER_%s \\\n", sym)
if (compat_only[sym]) {
printf(" symver_compat0 (\"%s\", %s, %s)", sym, sym, v)
} else if (includesym[sym] > 0) {
printf(" symver_default (\"%s\", %s, %s)", sym, sym, v)
} else {
# Due to what appears to be a bug in GNU ld,
# we must not issue symver_default() if there
# aren't going to be any other versions.
printf(" symver_nop ()")
}
} else {
printf("; \\\n symver_compat (%d, \"%s\", %s, %s, %s)",
seq, sym, sym, sym, v)
}
seq++
}
}
print ""
} else {
printf("#define SYMVER_%s symver_nop()\n", sym)
}
}
print ""
print "#endif /* crypt-symbol-vers.h */"
}
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