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Overview
| Comment: | Performance optimization the Vdbe allocator. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
e2c4995bf1099cc02bcb1dc4a4631f06 |
| User & Date: | drh 2016-04-12 00:26:59 |
Context
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2016-04-12
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| 11:58 | Update the header comment on the memjournal.c file. No code changes. (check-in: 07f10dea user: drh tags: trunk) | |
| 00:26 | Performance optimization the Vdbe allocator. (check-in: e2c4995b user: drh tags: trunk) | |
| 00:16 | Avoid unnecessary calls to object destructors for a small performance gain. (check-in: aec94b6e user: drh tags: trunk) | |
Changes
Changes to src/select.c.
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return pTab; } /* ** Get a VDBE for the given parser context. Create a new one if necessary. ** If an error occurs, return NULL and leave a message in pParse. */ Vdbe *sqlite3GetVdbe(Parse *pParse){ Vdbe *v = pParse->pVdbe; if( v==0 ){ v = pParse->pVdbe = sqlite3VdbeCreate(pParse); if( v ) sqlite3VdbeAddOp0(v, OP_Init); if( pParse->pToplevel==0 && OptimizationEnabled(pParse->db,SQLITE_FactorOutConst) ){ pParse->okConstFactor = 1; } } return v; } /* ** Compute the iLimit and iOffset fields of the SELECT based on the ** pLimit and pOffset expressions. pLimit and pOffset hold the expressions ** that appear in the original SQL statement after the LIMIT and OFFSET |
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return pTab; } /* ** Get a VDBE for the given parser context. Create a new one if necessary. ** If an error occurs, return NULL and leave a message in pParse. */ static SQLITE_NOINLINE Vdbe *allocVdbe(Parse *pParse){ Vdbe *v = pParse->pVdbe = sqlite3VdbeCreate(pParse); if( v ) sqlite3VdbeAddOp0(v, OP_Init); if( pParse->pToplevel==0 && OptimizationEnabled(pParse->db,SQLITE_FactorOutConst) ){ pParse->okConstFactor = 1; } return v; } Vdbe *sqlite3GetVdbe(Parse *pParse){ Vdbe *v = pParse->pVdbe; return v ? v : allocVdbe(pParse); } /* ** Compute the iLimit and iOffset fields of the SELECT based on the ** pLimit and pOffset expressions. pLimit and pOffset hold the expressions ** that appear in the original SQL statement after the LIMIT and OFFSET |