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DEBUG: new "ziplist" subcommand added. Dumps a ziplist on stdout.

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The commit improves ziplistRepr() and adds a new debugging subcommand so
that we can trigger the dump directly from the Redis API.
This command capability was used while investigating issue #3684.
This commit is contained in:
antirez
2016-12-16 09:02:50 +01:00
parent b53e73e159
commit ac61f90625
4 changed files with 35 additions and 13 deletions
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31
src/ziplist.c
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@ -1029,7 +1029,7 @@ void ziplistRepr(unsigned char *zl) {
printf(
"{total bytes %d} "
"{length %u}\n"
"{num entries %u}\n"
"{tail offset %u}\n",
intrev32ifbe(ZIPLIST_BYTES(zl)),
intrev16ifbe(ZIPLIST_LENGTH(zl)),
@ -1038,16 +1038,15 @@ void ziplistRepr(unsigned char *zl) {
while(*p != ZIP_END) {
zipEntry(p, &entry);
printf(
"{"
"addr 0x%08lx, "
"index %2d, "
"offset %5ld, "
"rl: %5u, "
"hs %2u, "
"pl: %5u, "
"pls: %2u, "
"payload %5u"
"} ",
"{\n"
"\taddr 0x%08lx,\n"
"\tindex %2d,\n"
"\toffset %5ld,\n"
"\thdr+entry len: %5u,\n"
"\thdr len%2u,\n"
"\tprevrawlen: %5u,\n"
"\tprevrawlensize: %2u,\n"
"\tpayload %5u\n",
(long unsigned)p,
index,
(unsigned long) (p-zl),
@ -1056,8 +1055,14 @@ void ziplistRepr(unsigned char *zl) {
entry.prevrawlen,
entry.prevrawlensize,
entry.len);
printf("\tbytes: ");
for (unsigned int i = 0; i < entry.headersize+entry.len; i++) {
printf("%02x|",p[i]);
}
printf("\n");
p += entry.headersize;
if (ZIP_IS_STR(entry.encoding)) {
printf("\t[str]");
if (entry.len > 40) {
if (fwrite(p,40,1,stdout) == 0) perror("fwrite");
printf("...");
@ -1066,9 +1071,9 @@ void ziplistRepr(unsigned char *zl) {
fwrite(p,entry.len,1,stdout) == 0) perror("fwrite");
}
} else {
printf("%lld", (long long) zipLoadInteger(p,entry.encoding));
printf("\t[int]%lld", (long long) zipLoadInteger(p,entry.encoding));
}
printf("\n");
printf("\n}\n");
p += entry.len;
index++;
}