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commit a64af8c9b6598f6d2685227f64f5ccb9b48c663c
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon May 10 10:31:41 2021 +0200
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scripts/versions.awk: Add strings and hashes to <first-versions.h>
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This generates new macros of this from:
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They are useful for symbol lookups using _dl_lookup_direct.
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Tested-by: Carlos O'Donell <carlos@redhat.com>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/scripts/versions.awk b/scripts/versions.awk
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index a3df316c703ea98b..0c900b83347ce8f9 100644
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--- a/scripts/versions.awk
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+++ b/scripts/versions.awk
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@@ -32,6 +32,29 @@ BEGIN {
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sort = "sort -t. -k 1,1 -k 2n,2n -k 3 > " tmpfile;
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}
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+# GNU awk does not implement the ord and chr functions.
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+# <https://www.gnu.org/software/gawk/manual/html_node/Ordinal-Functions.html>
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+# says that they are "written very nicely", using code similar to what
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+# is included here.
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+function chr(c) {
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+ return sprintf("%c", c)
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+}
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+
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+BEGIN {
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+ for (c = 1; c < 127; c++) {
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+ ord_table[chr(c)] = c;
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+ }
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+}
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+
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+function ord(c) {
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+ if (ord_table[c]) {
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+ return ord_table[c];
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+ } else {
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+ printf("Invalid character reference: '%c'\n", c) > "/dev/stderr";
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+ ++lossage;
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+ }
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+}
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+
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# Remove comment lines.
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/^ *#/ {
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next;
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@@ -90,6 +113,17 @@ function close_and_move(name, real_name) {
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system(move_if_change " " name " " real_name " >&2");
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}
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+# ELF hash, for use with symbol versions.
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+function elf_hash(s, i, acc) {
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+ acc = 0;
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+ for (i = 1; i <= length(s); ++i) {
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+ acc = and(lshift(acc, 4) + ord(substr(s, i, 1)), 0xffffffff);
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+ top = and(acc, 0xf0000000);
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+ acc = and(xor(acc, rshift(top, 24)), compl(top));
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+ }
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+ return acc;
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+}
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+
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# Now print the accumulated information.
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END {
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close(sort);
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@@ -145,6 +179,8 @@ END {
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&& oldver ~ "^GLIBC_[0-9]" \
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&& sym ~ "^[A-Za-z0-9_]*$") {
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ver_val = oldver;
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+ printf("#define %s_STRING \"%s\"\n", first_ver_macro, ver_val) > first_ver_header;
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+ printf("#define %s_HASH 0x%x\n", first_ver_macro, elf_hash(ver_val)) > first_ver_header;
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gsub("\\.", "_", ver_val);
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printf("#define %s %s\n", first_ver_macro, ver_val) > first_ver_header;
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first_ver_seen[first_ver_macro] = 1;
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