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Overview
Comment: | Improved comments and extra testcase() macros on the serial-type computation logic in the OP_MakeRecord opcode. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
18bfb2179ce2c60cec8f5859a84b7377 |
User & Date: | drh 2019-07-11 19:50:18.474 |
Context
2019-07-13
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16:15 | Remove unreachable "break" statements to silence harmless compiler warnings from ICC. (check-in: 0d7287e1bf user: drh tags: trunk) | |
09:56 | Merge latest trunk changes into this branch. (check-in: 86ab963cc5 user: dan tags: filter-clause) | |
2019-07-11
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19:50 | Improved comments and extra testcase() macros on the serial-type computation logic in the OP_MakeRecord opcode. (check-in: 18bfb2179c user: drh tags: trunk) | |
19:27 | Increase the version number to 3.30.0 for the next release cycle. (check-in: 2578e3c64b user: drh tags: trunk) | |
Changes
Changes to src/vdbe.c.
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2923 2924 2925 2926 2927 2928 2929 | pLast--; nField--; } } #endif /* Loop through the elements that will make up the record to figure | | > > > > > > > > > > > > > > > > > > > > > > > | > > > > > | 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 | pLast--; nField--; } } #endif /* Loop through the elements that will make up the record to figure ** out how much space is required for the new record. After this loop, ** the Mem.uTemp field of each term should hold the serial-type that will ** be used for that term in the generated record: ** ** Mem.uTemp value type ** --------------- --------------- ** 0 NULL ** 1 1-byte signed integer ** 2 2-byte signed integer ** 3 3-byte signed integer ** 4 4-byte signed integer ** 5 6-byte signed integer ** 6 8-byte signed integer ** 7 IEEE float ** 8 Integer constant 0 ** 9 Integer constant 1 ** 10,11 reserved for expansion ** N>=12 and even BLOB ** N>=13 and odd text ** ** The following additional values are computed: ** nHdr Number of bytes needed for the record header ** nData Number of bytes of data space needed for the record ** nZero Zero bytes at the end of the record */ pRec = pLast; do{ assert( memIsValid(pRec) ); if( pRec->flags & MEM_Null ){ if( pRec->flags & MEM_Zero ){ /* Values with MEM_Null and MEM_Zero are created by xColumn virtual ** table methods that never invoke sqlite3_result_xxxxx() while ** computing an unchanging column value in an UPDATE statement. ** Give such values a special internal-use-only serial-type of 10 ** so that they can be passed through to xUpdate and have ** a true sqlite3_value_nochange(). */ assert( pOp->p5==OPFLAG_NOCHNG_MAGIC || CORRUPT_DB ); pRec->uTemp = 10; }else{ pRec->uTemp = 0; } nHdr++; }else if( pRec->flags & (MEM_Int|MEM_IntReal) ){ /* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */ i64 i = pRec->u.i; u64 u; testcase( pRec->flags & MEM_Int ); testcase( pRec->flags & MEM_IntReal ); if( i<0 ){ u = ~i; }else{ u = i; } nHdr++; testcase( u==127 ); testcase( u==128 ); testcase( u==32767 ); testcase( u==32768 ); testcase( u==8388607 ); testcase( u==8388608 ); testcase( u==2147483647 ); testcase( u==2147483648 ); testcase( u==140737488355327LL ); testcase( u==140737488355328LL ); if( u<=127 ){ if( (i&1)==i && file_format>=4 ){ pRec->uTemp = 8+(u32)u; }else{ nData++; pRec->uTemp = 1; } |
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