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Overview
| Comment: | Improved comments and extra testcase() macros on the serial-type computation logic in the OP_MakeRecord opcode. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
18bfb2179ce2c60cec8f5859a84b7377 |
| User & Date: | drh 2019-07-11 19:50:18 |
Context
|
2019-07-13
| ||
| 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
| ||
| 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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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.
*/
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
................................................................................
** 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; /* Serial-type 0 means NULL */
}
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++;
if( u<=127 ){
if( (i&1)==i && file_format>=4 ){
pRec->uTemp = 8+(u32)u;
}else{
nData++;
pRec->uTemp = 1;
}
|
| > > > > > > > > > > > > > > > > > > > > > > > | > > > > > |
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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
................................................................................
** 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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