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Overview
Comment: | Another optimization on the OP_Column opcode. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
1765672c2599eb03d39c52cd2dc32ea1 |
User & Date: | drh 2016-05-20 21:40:11.890 |
Context
2016-05-20
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23:51 | Add a simple TCL script for summing cachegrind information for each VDBE opcode. (check-in: 96cf821b6a user: drh tags: trunk) | |
21:40 | Another optimization on the OP_Column opcode. (check-in: 1765672c25 user: drh tags: trunk) | |
20:58 | Fix typo in comment. (check-in: 9db8f21473 user: mistachkin tags: trunk) | |
Changes
Changes to src/vdbe.c.
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2527 2528 2529 2530 2531 2532 2533 | }else{ zHdr += sqlite3GetVarint32(zHdr, &t); offset64 += sqlite3VdbeSerialTypeLen(t); } pC->aType[i++] = t; aOffset[i] = (u32)(offset64 & 0xffffffff); }while( i<=p2 && zHdr<zEndHdr ); | < < | < > > > | 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 | }else{ zHdr += sqlite3GetVarint32(zHdr, &t); offset64 += sqlite3VdbeSerialTypeLen(t); } pC->aType[i++] = t; aOffset[i] = (u32)(offset64 & 0xffffffff); }while( i<=p2 && zHdr<zEndHdr ); /* The record is corrupt if any of the following are true: ** (1) the bytes of the header extend past the declared header size ** (2) the entire header was used but not all data was used ** (3) the end of the data extends beyond the end of the record. */ if( (zHdr>=zEndHdr && (zHdr>zEndHdr || offset64!=pC->payloadSize)) || (offset64 > pC->payloadSize) ){ if( pC->aRow==0 ) sqlite3VdbeMemRelease(&sMem); rc = SQLITE_CORRUPT_BKPT; goto abort_due_to_error; } pC->nHdrParsed = i; pC->iHdrOffset = (u32)(zHdr - zData); if( pC->aRow==0 ) sqlite3VdbeMemRelease(&sMem); }else{ t = 0; } /* If after trying to extract new entries from the header, nHdrParsed is ** still not up to p2, that means that the record has fewer than p2 ** columns. So the result will be either the default value or a NULL. |
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