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Size and performance optimizations on the sqlite3ExprAssignVarNumber() routine.

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FossilOrigin-Name: 109852e51e2cc2674940ba3e5097a92e66f88bb8
This commit is contained in:
drh 2016-10-03 16:33:14 +00:00
parent de25a88c50
commit c9b39288ae
3 changed files with 27 additions and 29 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Avoid\sunnecessary\sstrlen()\scalls\sin\ssqlite3ExprAssignVarNumber()\sby\spassing\sin\nthe\stoken\slength\sfrom\sthe\sparser.
D 2016-10-03T15:28:24.522
C Size\sand\sperformance\soptimizations\son\sthe\ssqlite3ExprAssignVarNumber()\sroutine.
D 2016-10-03T16:33:14.952
F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 5151cc64c4c05f3455f4f692ad11410a810d937f
@ -339,7 +339,7 @@ F src/ctime.c e77f3dc297b4b65c96da78b4ae4272fdfae863d7
F src/date.c 95c9a8d00767e7221a8e9a31f4e913fc8029bf6b
F src/dbstat.c 19ee7a4e89979d4df8e44cfac7a8f905ec89b77d
F src/delete.c cb3f6300df24c26c609778b2731f82644b5532ec
F src/expr.c cf99b1a327b4eb0a85d59f1c01d82bc2a318c544
F src/expr.c aac0b8d39373ce8f1d47829ce12c3d7af90c46a6
F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
F src/fkey.c b9ca262f6ad4d030a3cab737ebf9b0b3c8b4ac80
F src/func.c 29cc9acb170ec1387b9f63eb52cd85f8de96c771
@ -1525,7 +1525,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 5bb7cde0731d23411e9df02a957010f94203397b
R ff4f5cc57903ee66db0f97f1966e5988
P d15ae2e530cffea60263f203ac5f89b6790f4bd5
R 02650575d610a64473014408e653c2e2
U drh
Z 380867cb8aabea21260823e30d45c1c4
Z 400dafa0c844d13dbe01d3e4d393d771

2
manifest.uuid
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@ -1 +1 @@
d15ae2e530cffea60263f203ac5f89b6790f4bd5
109852e51e2cc2674940ba3e5097a92e66f88bb8

20
src/expr.c
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@ -953,13 +953,13 @@ void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
assert( z[0]=='?' );
pExpr->iColumn = (ynVar)(++pParse->nVar);
}else{
ynVar x = 0;
ynVar x;
if( z[0]=='?' ){
/* Wildcard of the form "?nnn". Convert "nnn" to an integer and
** use it as the variable number */
i64 i;
int bOk = 0==sqlite3Atoi64(&z[1], &i, n-1, SQLITE_UTF8);
pExpr->iColumn = x = (ynVar)i;
x = (ynVar)i;
testcase( i==0 );
testcase( i==1 );
testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]-1 );
@ -967,7 +967,7 @@ void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
if( bOk==0 || i<1 || i>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
x = 0;
return;
}
if( i>pParse->nVar ){
pParse->nVar = (int)i;
@ -978,15 +978,15 @@ void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
** has never appeared before, reuse the same variable number
*/
ynVar i;
for(i=0; i<pParse->nzVar; i++){
for(i=x=0; i<pParse->nzVar; i++){
if( pParse->azVar[i] && strcmp(pParse->azVar[i],z)==0 ){
pExpr->iColumn = x = (ynVar)i+1;
x = (ynVar)i+1;
break;
}
}
if( x==0 ) x = pExpr->iColumn = (ynVar)(++pParse->nVar);
if( x==0 ) x = (ynVar)(++pParse->nVar);
}
if( x>0 ){
pExpr->iColumn = x;
if( x>pParse->nzVar ){
char **a;
a = sqlite3DbRealloc(db, pParse->azVar, x*sizeof(a[0]));
@ -998,13 +998,11 @@ void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
memset(&a[pParse->nzVar], 0, (x-pParse->nzVar)*sizeof(a[0]));
pParse->nzVar = x;
}
if( z[0]!='?' || pParse->azVar[x-1]==0 ){
sqlite3DbFree(db, pParse->azVar[x-1]);
if( pParse->azVar[x-1]==0 ){
pParse->azVar[x-1] = sqlite3DbStrNDup(db, z, n);
}
}
}
if( !pParse->nErr && pParse->nVar>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
if( pParse->nVar>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "too many SQL variables");
}
}