X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7c0e1b53c4c4f646c788fcd09666e1c321c1d134..18aa2b87b6db7fa79b0596590aa385adcbc64e53:/src/ziplist.c diff --git a/src/ziplist.c b/src/ziplist.c index 1c492f25..113e71d9 100644 --- a/src/ziplist.c +++ b/src/ziplist.c @@ -67,11 +67,10 @@ #include #include #include "zmalloc.h" +#include "util.h" #include "ziplist.h" #include "endian.h" -int ll2string(char *s, size_t len, long long value); - #define ZIP_END 255 #define ZIP_BIGLEN 254 @@ -93,13 +92,15 @@ int ll2string(char *s, size_t len, long long value); #define ZIPLIST_LENGTH(zl) (*((uint16_t*)((zl)+sizeof(uint32_t)*2))) #define ZIPLIST_HEADER_SIZE (sizeof(uint32_t)*2+sizeof(uint16_t)) #define ZIPLIST_ENTRY_HEAD(zl) ((zl)+ZIPLIST_HEADER_SIZE) -#define ZIPLIST_ENTRY_TAIL(zl) ((zl)+ZIPLIST_TAIL_OFFSET(zl)) -#define ZIPLIST_ENTRY_END(zl) ((zl)+ZIPLIST_BYTES(zl)-1) +#define ZIPLIST_ENTRY_TAIL(zl) ((zl)+intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))) +#define ZIPLIST_ENTRY_END(zl) ((zl)+intrev32ifbe(ZIPLIST_BYTES(zl))-1) /* We know a positive increment can only be 1 because entries can only be * pushed one at a time. */ #define ZIPLIST_INCR_LENGTH(zl,incr) { \ - if (ZIPLIST_LENGTH(zl) < UINT16_MAX) ZIPLIST_LENGTH(zl)+=incr; } + if (ZIPLIST_LENGTH(zl) < UINT16_MAX) \ + ZIPLIST_LENGTH(zl) = intrev16ifbe(intrev16ifbe(ZIPLIST_LENGTH(zl))+incr); \ +} typedef struct zlentry { unsigned int prevrawlensize, prevrawlen; @@ -252,22 +253,9 @@ static int zipPrevLenByteDiff(unsigned char *p, unsigned int len) { * Stores the integer value in 'v' and its encoding in 'encoding'. */ static int zipTryEncoding(unsigned char *entry, unsigned int entrylen, long long *v, unsigned char *encoding) { long long value; - char *eptr; - char buf[32]; if (entrylen >= 32 || entrylen == 0) return 0; - if (entry[0] == '-' || (entry[0] >= '0' && entry[0] <= '9')) { - int slen; - - /* Perform a back-and-forth conversion to make sure that - * the string turned into an integer is not losing any info. */ - memcpy(buf,entry,entrylen); - buf[entrylen] = '\0'; - value = strtoll(buf,&eptr,10); - if (eptr[0] != '\0') return 0; - slen = ll2string(buf,32,value); - if (entrylen != (unsigned)slen || memcmp(buf,entry,slen)) return 0; - + if (string2ll((char*)entry,entrylen,&value)) { /* Great, the string can be encoded. Check what's the smallest * of our encoding types that can hold this value. */ if (value >= INT16_MIN && value <= INT16_MAX) { @@ -316,11 +304,11 @@ static int64_t zipLoadInteger(unsigned char *p, unsigned char encoding) { ret = i16; } else if (encoding == ZIP_INT_32B) { memcpy(&i32,p,sizeof(i32)); - memrev16ifbe(&i32); + memrev32ifbe(&i32); ret = i32; } else if (encoding == ZIP_INT_64B) { memcpy(&i64,p,sizeof(i64)); - memrev16ifbe(&i64); + memrev64ifbe(&i64); ret = i64; } else { assert(NULL); @@ -349,8 +337,8 @@ static unsigned int zipRawEntryLength(unsigned char *p) { unsigned char *ziplistNew(void) { unsigned int bytes = ZIPLIST_HEADER_SIZE+1; unsigned char *zl = zmalloc(bytes); - ZIPLIST_BYTES(zl) = bytes; - ZIPLIST_TAIL_OFFSET(zl) = ZIPLIST_HEADER_SIZE; + ZIPLIST_BYTES(zl) = intrev32ifbe(bytes); + ZIPLIST_TAIL_OFFSET(zl) = intrev32ifbe(ZIPLIST_HEADER_SIZE); ZIPLIST_LENGTH(zl) = 0; zl[bytes-1] = ZIP_END; return zl; @@ -359,7 +347,7 @@ unsigned char *ziplistNew(void) { /* Resize the ziplist. */ static unsigned char *ziplistResize(unsigned char *zl, unsigned int len) { zl = zrealloc(zl,len); - ZIPLIST_BYTES(zl) = len; + ZIPLIST_BYTES(zl) = intrev32ifbe(len); zl[len-1] = ZIP_END; return zl; } @@ -385,7 +373,7 @@ static unsigned char *ziplistResize(unsigned char *zl, unsigned int len) { * The pointer "p" points to the first entry that does NOT need to be * updated, i.e. consecutive fields MAY need an update. */ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p) { - size_t curlen = ZIPLIST_BYTES(zl), rawlen, rawlensize; + size_t curlen = intrev32ifbe(ZIPLIST_BYTES(zl)), rawlen, rawlensize; size_t offset, noffset, extra; unsigned char *np; zlentry cur, next; @@ -408,12 +396,19 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p offset = p-zl; extra = rawlensize-next.prevrawlensize; zl = ziplistResize(zl,curlen+extra); - ZIPLIST_TAIL_OFFSET(zl) += extra; p = zl+offset; - /* Move the tail to the back. */ + /* Current pointer and offset for next element. */ np = p+rawlen; noffset = np-zl; + + /* Update tail offset when next element is not the tail element. */ + if ((zl+intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))) != np) { + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe(intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))+extra); + } + + /* Move the tail to the back. */ memmove(np+rawlensize, np+next.prevrawlensize, curlen-noffset-next.prevrawlensize-1); @@ -462,25 +457,30 @@ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsig zipPrevEncodeLength(p-nextdiff,first.prevrawlen); /* Update offset for tail */ - ZIPLIST_TAIL_OFFSET(zl) -= totlen; + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe(intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))-totlen); /* When the tail contains more than one entry, we need to take * "nextdiff" in account as well. Otherwise, a change in the * size of prevlen doesn't have an effect on the *tail* offset. */ tail = zipEntry(p); - if (p[tail.headersize+tail.len] != ZIP_END) - ZIPLIST_TAIL_OFFSET(zl) += nextdiff; + if (p[tail.headersize+tail.len] != ZIP_END) { + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe(intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))+nextdiff); + } /* Move tail to the front of the ziplist */ - memmove(first.p,p-nextdiff,ZIPLIST_BYTES(zl)-(p-zl)-1+nextdiff); + memmove(first.p,p-nextdiff, + intrev32ifbe(ZIPLIST_BYTES(zl))-(p-zl)-1+nextdiff); } else { /* The entire tail was deleted. No need to move memory. */ - ZIPLIST_TAIL_OFFSET(zl) = (first.p-zl)-first.prevrawlen; + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe((first.p-zl)-first.prevrawlen); } /* Resize and update length */ offset = first.p-zl; - zl = ziplistResize(zl, ZIPLIST_BYTES(zl)-totlen+nextdiff); + zl = ziplistResize(zl, intrev32ifbe(ZIPLIST_BYTES(zl))-totlen+nextdiff); ZIPLIST_INCR_LENGTH(zl,-deleted); p = zl+offset; @@ -494,11 +494,13 @@ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsig /* Insert item at "p". */ static unsigned char *__ziplistInsert(unsigned char *zl, unsigned char *p, unsigned char *s, unsigned int slen) { - size_t curlen = ZIPLIST_BYTES(zl), reqlen, prevlen = 0; + size_t curlen = intrev32ifbe(ZIPLIST_BYTES(zl)), reqlen, prevlen = 0; size_t offset; int nextdiff = 0; unsigned char encoding = 0; - long long value; + long long value = 123456789; /* initialized to avoid warning. Using a value + that is easy to see if for some reason + we use it uninitialized. */ zlentry entry, tail; /* Find out prevlen for the entry that is inserted. */ @@ -545,17 +547,20 @@ static unsigned char *__ziplistInsert(unsigned char *zl, unsigned char *p, unsig zipPrevEncodeLength(p+reqlen,reqlen); /* Update offset for tail */ - ZIPLIST_TAIL_OFFSET(zl) += reqlen; + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe(intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))+reqlen); /* When the tail contains more than one entry, we need to take * "nextdiff" in account as well. Otherwise, a change in the * size of prevlen doesn't have an effect on the *tail* offset. */ tail = zipEntry(p+reqlen); - if (p[reqlen+tail.headersize+tail.len] != ZIP_END) - ZIPLIST_TAIL_OFFSET(zl) += nextdiff; + if (p[reqlen+tail.headersize+tail.len] != ZIP_END) { + ZIPLIST_TAIL_OFFSET(zl) = + intrev32ifbe(intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))+nextdiff); + } } else { /* This element will be the new tail. */ - ZIPLIST_TAIL_OFFSET(zl) = p-zl; + ZIPLIST_TAIL_OFFSET(zl) = intrev32ifbe(p-zl); } /* When nextdiff != 0, the raw length of the next entry has changed, so @@ -727,8 +732,8 @@ unsigned int ziplistCompare(unsigned char *p, unsigned char *sstr, unsigned int /* Return length of ziplist. */ unsigned int ziplistLen(unsigned char *zl) { unsigned int len = 0; - if (ZIPLIST_LENGTH(zl) < UINT16_MAX) { - len = ZIPLIST_LENGTH(zl); + if (intrev16ifbe(ZIPLIST_LENGTH(zl)) < UINT16_MAX) { + len = intrev16ifbe(ZIPLIST_LENGTH(zl)); } else { unsigned char *p = zl+ZIPLIST_HEADER_SIZE; while (*p != ZIP_END) { @@ -737,14 +742,14 @@ unsigned int ziplistLen(unsigned char *zl) { } /* Re-store length if small enough */ - if (len < UINT16_MAX) ZIPLIST_LENGTH(zl) = len; + if (len < UINT16_MAX) ZIPLIST_LENGTH(zl) = intrev16ifbe(len); } return len; } /* Return ziplist blob size in bytes. */ size_t ziplistBlobLen(unsigned char *zl) { - return ZIPLIST_BYTES(zl); + return intrev32ifbe(ZIPLIST_BYTES(zl)); } void ziplistRepr(unsigned char *zl) { @@ -756,9 +761,9 @@ void ziplistRepr(unsigned char *zl) { "{total bytes %d} " "{length %u}\n" "{tail offset %u}\n", - ZIPLIST_BYTES(zl), - ZIPLIST_LENGTH(zl), - ZIPLIST_TAIL_OFFSET(zl)); + intrev32ifbe(ZIPLIST_BYTES(zl)), + intrev16ifbe(ZIPLIST_LENGTH(zl)), + intrev32ifbe(ZIPLIST_TAIL_OFFSET(zl))); p = ZIPLIST_ENTRY_HEAD(zl); while(*p != ZIP_END) { entry = zipEntry(p); @@ -859,7 +864,7 @@ void stress(int pos, int num, int maxsize, int dnum) { zl = ziplistDeleteRange(zl,0,1); } printf("List size: %8d, bytes: %8d, %dx push+pop (%s): %6lld usec\n", - i,ZIPLIST_BYTES(zl),num,posstr[pos],usec()-start); + i,intrev32ifbe(ZIPLIST_BYTES(zl)),num,posstr[pos],usec()-start); zfree(zl); } } @@ -889,7 +894,7 @@ void pop(unsigned char *zl, int where) { } } -void randstring(char *target, unsigned int min, unsigned int max) { +int randstring(char *target, unsigned int min, unsigned int max) { int p, len = min+rand()%(max-min+1); int minval, maxval; switch(rand() % 3) { @@ -911,10 +916,9 @@ void randstring(char *target, unsigned int min, unsigned int max) { while(p < len) target[p++] = minval+rand()%(maxval-minval+1); - return; + return len; } - int main(int argc, char **argv) { unsigned char *zl, *p; unsigned char *entry; @@ -1247,6 +1251,7 @@ int main(int argc, char **argv) { int i,j,len,where; unsigned char *p; char buf[1024]; + int buflen; list *ref; listNode *refnode; @@ -1255,10 +1260,6 @@ int main(int argc, char **argv) { unsigned int slen; long long sval; - /* In the regression for the cascade bug, it was triggered - * with a random seed of 2. */ - srand(2); - for (i = 0; i < 20000; i++) { zl = ziplistNew(); ref = listCreate(); @@ -1268,31 +1269,32 @@ int main(int argc, char **argv) { /* Create lists */ for (j = 0; j < len; j++) { where = (rand() & 1) ? ZIPLIST_HEAD : ZIPLIST_TAIL; - switch(rand() % 4) { - case 0: - sprintf(buf,"%lld",(0LL + rand()) >> 20); - break; - case 1: - sprintf(buf,"%lld",(0LL + rand())); - break; - case 2: - sprintf(buf,"%lld",(0LL + rand()) << 20); - break; - case 3: - randstring(buf,0,256); - break; - default: - assert(NULL); + if (rand() % 2) { + buflen = randstring(buf,1,sizeof(buf)-1); + } else { + switch(rand() % 3) { + case 0: + buflen = sprintf(buf,"%lld",(0LL + rand()) >> 20); + break; + case 1: + buflen = sprintf(buf,"%lld",(0LL + rand())); + break; + case 2: + buflen = sprintf(buf,"%lld",(0LL + rand()) << 20); + break; + default: + assert(NULL); + } } /* Add to ziplist */ - zl = ziplistPush(zl, (unsigned char*)buf, strlen(buf), where); + zl = ziplistPush(zl, (unsigned char*)buf, buflen, where); /* Add to reference list */ if (where == ZIPLIST_HEAD) { - listAddNodeHead(ref,sdsnew(buf)); + listAddNodeHead(ref,sdsnewlen(buf, buflen)); } else if (where == ZIPLIST_TAIL) { - listAddNodeTail(ref,sdsnew(buf)); + listAddNodeTail(ref,sdsnewlen(buf, buflen)); } else { assert(NULL); } @@ -1307,12 +1309,13 @@ int main(int argc, char **argv) { assert(ziplistGet(p,&sstr,&slen,&sval)); if (sstr == NULL) { - sprintf(buf,"%lld",sval); + buflen = sprintf(buf,"%lld",sval); } else { - memcpy(buf,sstr,slen); - buf[slen] = '\0'; + buflen = slen; + memcpy(buf,sstr,buflen); + buf[buflen] = '\0'; } - assert(strcmp(buf,listNodeValue(refnode)) == 0); + assert(memcmp(buf,listNodeValue(refnode),buflen) == 0); } zfree(zl); listRelease(ref);