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A new implementation of sqlite3VdbeMakeLabel() is faster and makes fewer

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memory allocations by deferring memory allocation until 
sqlite3VdbeResolveLabel() is called, at which point the code generator has
a better idea of how big the relocation table needs to be.
The sqlite3VdbeMakeLabel() routine now takes a Parse* parameter instead of
Vdbe*.

FossilOrigin-Name: 4a0929ac76d8aa5dd65eac3b83d6bbf41e505e01d175ca0fb2b19ba02d439415
This commit is contained in:
drh
2018-12-29 02:26:59 +00:00
parent 81f9159b5e
commit ec4ccdbcb1
17 changed files with 112 additions and 104 deletions
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8
src/wherecode.c
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@@ -565,7 +565,7 @@ static int codeEqualityTerm(
pLoop->wsFlags |= WHERE_IN_ABLE;
if( pLevel->u.in.nIn==0 ){
pLevel->addrNxt = sqlite3VdbeMakeLabel(v);
pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
}
i = pLevel->u.in.nIn;
@@ -1213,8 +1213,8 @@ Bitmask sqlite3WhereCodeOneLoopStart(
** there are no IN operators in the constraints, the "addrNxt" label
** is the same as "addrBrk".
*/
addrBrk = pLevel->addrBrk = pLevel->addrNxt = sqlite3VdbeMakeLabel(v);
addrCont = pLevel->addrCont = sqlite3VdbeMakeLabel(v);
addrBrk = pLevel->addrBrk = pLevel->addrNxt = sqlite3VdbeMakeLabel(pParse);
addrCont = pLevel->addrCont = sqlite3VdbeMakeLabel(pParse);
/* If this is the right table of a LEFT OUTER JOIN, allocate and
** initialize a memory cell that records if this table matches any
@@ -1835,7 +1835,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
int regReturn = ++pParse->nMem; /* Register used with OP_Gosub */
int regRowset = 0; /* Register for RowSet object */
int regRowid = 0; /* Register holding rowid */
int iLoopBody = sqlite3VdbeMakeLabel(v); /* Start of loop body */
int iLoopBody = sqlite3VdbeMakeLabel(pParse);/* Start of loop body */
int iRetInit; /* Address of regReturn init */
int untestedTerms = 0; /* Some terms not completely tested */
int ii; /* Loop counter */