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# Generate a version map file 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 and SYMVER_FLOOR. All symbol
# versions lower than SYMVER_MIN are discarded from the output.
# All symbol versions lower than SYMVER_FLOOR are replaced with
# SYMVER_FLOOR. SYMVER_FLOOR must be greater than or equal to SYMVER_MIN.
#
# The ordering of symbol versions is entirely controlled by the %chain
# directive, which must therefore list both all of the versions
# actually used for symbols, and all of the versions that might be
# used as SYMVER_MIN or SYMVER_FLOOR.
#
# Note: if you change the format of .map.in files you probably need to
# update gen-vers.awk too.
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] = $i
}
next
}
{
for (i = 2; i <= NF; i++) {
if ($i != "-") {
if ($i in SYMBOLS) {
SYMBOLS[$i] = SYMBOLS[$i] SUBSEP $1
} else {
SYMBOLS[$i] = $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.
for (i = symver_min_idx; 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]) {
symset[vr, syms[s]] = 1
allsyms[syms[s]] = 1
}
}
}
}
vp = ""
for (i = symver_floor_idx; i <= NVCHAIN; i++) {
v = VCHAIN[i]
split("", osyms)
j = 0
for (sym in allsyms) {
if ((v, sym) in symset) {
osyms[++j] = sym
}
}
if (j > 0) {
printf("%s {\n global:\n", v);
for (s = 1; s <= j; s++) {
printf(" %s;\n", osyms[s]);
}
if (vp == "") {
printf(" local:\n *;\n};\n");
} else {
printf("} %s;\n", vp);
}
vp = v
}
}
}
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