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Performance improvement in sqlite3StrAccumFinish() for the common case where

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no memory allocation is required.

FossilOrigin-Name: b6acf5d4ef016326a079463e70e71c2fc95a352d
This commit is contained in:
drh
2016-11-25 15:11:26 +00:00
parent 36fd41e52b
commit 043e586e29
3 changed files with 19 additions and 14 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Add\sa\scomment\sto\shelp\sclarify\sthe\sEP_FromJoin\shack\sin\sexprCodeBetween().
D 2016-11-25T14:30:42.666
C Performance\simprovement\sin\ssqlite3StrAccumFinish()\sfor\sthe\scommon\scase\swhere\nno\smemory\sallocation\sis\srequired.
D 2016-11-25T15:11:26.619
F Makefile.in 6b572807415d3f0a379cebc9461416d8df4a12c8
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc bb4d970894abbbe0e88d00aac29bd52af8bc95f4
@@ -383,7 +383,7 @@ F src/pcache1.c e3967219b2a92b9edcb9324a4ba75009090d3953
F src/pragma.c d932ba278654617cdd281f88a790a3185fca7c44
F src/pragma.h 64c78a648751b9f4f297276c4eb7507b14b4628c
F src/prepare.c b1140c3d0cf59bc85ace00ce363153041b424b7a
F src/printf.c a5f0ca08ddede803c241266abb46356ec748ded1
F src/printf.c 8a76e8e9b44a282bd78f5a4113e4dec233c3dfff
F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
F src/resolve.c bb070cf5f23611c44ab7e4788803684e385fc3fb
F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
@@ -1534,7 +1534,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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U drh
Z 1cc8fc31dc9cfa12819270a952431b2f
Z 9d212a5ec3719e9483eacdb11891359b

2
manifest.uuid
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@@ -1 +1 @@
6df7c5747e0247b14bf015ef4320ddcf6fccf694
b6acf5d4ef016326a079463e70e71c2fc95a352d

19
src/printf.c
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@@ -861,18 +861,23 @@ void sqlite3StrAccumAppendAll(StrAccum *p, const char *z){
** Return a pointer to the resulting string. Return a NULL
** pointer if any kind of error was encountered.
*/
static SQLITE_NOINLINE char *strAccumFinishRealloc(StrAccum *p){
assert( p->mxAlloc>0 && !isMalloced(p) );
p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
if( p->zText ){
memcpy(p->zText, p->zBase, p->nChar+1);
p->printfFlags |= SQLITE_PRINTF_MALLOCED;
}else{
setStrAccumError(p, STRACCUM_NOMEM);
}
return p->zText;
}
char *sqlite3StrAccumFinish(StrAccum *p){
if( p->zText ){
assert( (p->zText==p->zBase)==!isMalloced(p) );
p->zText[p->nChar] = 0;
if( p->mxAlloc>0 && !isMalloced(p) ){
p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
if( p->zText ){
memcpy(p->zText, p->zBase, p->nChar+1);
p->printfFlags |= SQLITE_PRINTF_MALLOCED;
}else{
setStrAccumError(p, STRACCUM_NOMEM);
}
return strAccumFinishRealloc(p);
}
}
return p->zText;