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Performance optimization to sqlite3_blob_read().

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FossilOrigin-Name: 7459f4b7ed4007d9ec44c3bf0fcba04f5f8540a9
This commit is contained in:
drh
2017-01-26 16:54:47 +00:00
parent 8bb9fd3b45
commit 83ec2761fa
3 changed files with 27 additions and 14 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Minor\ssimplification\sand\sperformance\soptimization\sfor\sDirect\sOverflow\sRead.
D 2017-01-26T16:27:32.813
C Performance\soptimization\sto\ssqlite3_blob_read().
D 2017-01-26T16:54:47.281
F Makefile.in 5f415e7867296d678fed2e6779aea10c1318b4bc
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -333,7 +333,7 @@ F src/auth.c 930b376a9c56998557367e6f7f8aaeac82a2a792
F src/backup.c faf17e60b43233c214aae6a8179d24503a61e83b
F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
F src/btmutex.c 0e9ce2d56159b89b9bc8e197e023ee11e39ff8ca
F src/btree.c a168da7c4fff00dbd939c49ad4445d378eff1b11
F src/btree.c 6fe6a5853148b623c4f5e288ae916180632ebbd3
F src/btree.h e6d352808956ec163a17f832193a3e198b3fb0ac
F src/btreeInt.h 10c4b77c2fb399580babbcc7cf652ac10dba796e
F src/build.c 9e799f1edd910dfa8a0bc29bd390d35d310596af
@@ -1547,7 +1547,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 9879be1899adf5634f551a2077b15ccb1133e4e3
R d7cd9a6ab86d59aef41165d7cf109b11
P 3e96d6efa867b765c8acf1454014b1e71b2e4f21
R 252dcd60be80c6c5c6ba84d2de14b6df
U drh
Z 50b1b915cab08ae10917e730aa3424e6
Z 39fbcc21c34e29a424df0af03b3f8d43

2
manifest.uuid
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@@ -1 +1 @@
3e96d6efa867b765c8acf1454014b1e71b2e4f21
7459f4b7ed4007d9ec44c3bf0fcba04f5f8540a9

27
src/btree.c
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@@ -4665,21 +4665,34 @@ int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0);
}
/*
** This variant of sqlite3BtreePayload() works even if the cursor has not
** in the CURSOR_VALID state. It is only used by the sqlite3_blob_read()
** interface.
*/
#ifndef SQLITE_OMIT_INCRBLOB
int sqlite3BtreePayloadChecked(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
static SQLITE_NOINLINE int accessPayloadChecked(
BtCursor *pCur,
u32 offset,
u32 amt,
void *pBuf
){
int rc;
if ( pCur->eState==CURSOR_INVALID ){
return SQLITE_ABORT;
}
assert( cursorOwnsBtShared(pCur) );
rc = restoreCursorPosition(pCur);
if( rc==SQLITE_OK ){
assert( pCur->eState==CURSOR_VALID );
assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
rc = accessPayload(pCur, offset, amt, pBuf, 0);
return rc ? rc : accessPayload(pCur, offset, amt, pBuf, 0);
}
int sqlite3BtreePayloadChecked(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
if( pCur->eState==CURSOR_VALID ){
assert( cursorOwnsBtShared(pCur) );
return accessPayload(pCur, offset, amt, pBuf, 0);
}else{
return accessPayloadChecked(pCur, offset, amt, pBuf);
}
return rc;
}
#endif /* SQLITE_OMIT_INCRBLOB */