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Overview
| Comment: | Fix a compiler warning when SQLITE_DIRECT_OVERFLOW_READ is defined. Minor performance enhancement and size reduction. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | overflow-pgno-cache |
| Files: | files | file ages | folders |
| SHA1: |
96385dc460545807a5c8fcf6280a9717 |
| User & Date: | drh 2014-03-31 23:57:41 |
Context
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2014-04-01
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| 01:24 | Remove an unnecessary conditional, replacing it with an assert(). Improvements to comments. Closed-Leaf check-in: 834bf1c3 user: drh tags: overflow-pgno-cache | |
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2014-03-31
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| 23:57 | Fix a compiler warning when SQLITE_DIRECT_OVERFLOW_READ is defined. Minor performance enhancement and size reduction. check-in: 96385dc4 user: drh tags: overflow-pgno-cache | |
| 22:03 | Merge in the latest changes and fixes from trunk. check-in: f6211540 user: drh tags: overflow-pgno-cache | |
Changes
Changes to src/btree.c.
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/* Now that no other errors can occur, finish filling in the BtCursor ** variables and link the cursor into the BtShared list. */ pCur->pgnoRoot = (Pgno)iTable; pCur->iPage = -1; pCur->pKeyInfo = pKeyInfo; pCur->pBtree = p; pCur->pBt = pBt; pCur->curFlags = wrFlag ? BTCF_WriteFlag : 0; pCur->pNext = pBt->pCursor; if( pCur->pNext ){ pCur->pNext->pPrev = pCur; } pBt->pCursor = pCur; pCur->eState = CURSOR_INVALID; return SQLITE_OK; ................................................................................ ){ unsigned char *aPayload; int rc = SQLITE_OK; u32 nKey; int iIdx = 0; MemPage *pPage = pCur->apPage[pCur->iPage]; /* Btree page of current entry */ BtShared *pBt = pCur->pBt; /* Btree this cursor belongs to */ int bEnd; /* True if reading to end of data */ assert( pPage ); assert( pCur->eState==CURSOR_VALID ); assert( pCur->aiIdx[pCur->iPage]<pPage->nCell ); assert( cursorHoldsMutex(pCur) ); getCellInfo(pCur); aPayload = pCur->info.pCell + pCur->info.nHeader; nKey = (pPage->intKey ? 0 : (int)pCur->info.nKey); bEnd = (offset+amt==nKey+pCur->info.nData); if( NEVER(offset+amt > nKey+pCur->info.nData) || &aPayload[pCur->info.nLocal] > &pPage->aData[pBt->usableSize] ){ /* Trying to read or write past the end of the data is an error */ return SQLITE_CORRUPT_BKPT; } |
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/* Now that no other errors can occur, finish filling in the BtCursor ** variables and link the cursor into the BtShared list. */ pCur->pgnoRoot = (Pgno)iTable; pCur->iPage = -1; pCur->pKeyInfo = pKeyInfo; pCur->pBtree = p; pCur->pBt = pBt; assert( wrFlag==0 || wrFlag==BTCF_WriteFlag ); pCur->curFlags = wrFlag; pCur->pNext = pBt->pCursor; if( pCur->pNext ){ pCur->pNext->pPrev = pCur; } pBt->pCursor = pCur; pCur->eState = CURSOR_INVALID; return SQLITE_OK; ................................................................................ ){ unsigned char *aPayload; int rc = SQLITE_OK; u32 nKey; int iIdx = 0; MemPage *pPage = pCur->apPage[pCur->iPage]; /* Btree page of current entry */ BtShared *pBt = pCur->pBt; /* Btree this cursor belongs to */ #ifdef SQLITE_DIRECT_OVERFLOW_READ int bEnd; /* True if reading to end of data */ #endif assert( pPage ); assert( pCur->eState==CURSOR_VALID ); assert( pCur->aiIdx[pCur->iPage]<pPage->nCell ); assert( cursorHoldsMutex(pCur) ); getCellInfo(pCur); aPayload = pCur->info.pCell + pCur->info.nHeader; nKey = (pPage->intKey ? 0 : (int)pCur->info.nKey); #ifdef SQLITE_DIRECT_OVERFLOW_READ bEnd = (offset+amt==nKey+pCur->info.nData); #endif if( NEVER(offset+amt > nKey+pCur->info.nData) || &aPayload[pCur->info.nLocal] > &pPage->aData[pBt->usableSize] ){ /* Trying to read or write past the end of the data is an error */ return SQLITE_CORRUPT_BKPT; } |
Changes to src/btreeInt.h.
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u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */ MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */ }; /* ** Legal values for BtCursor.curFlags */ #define BTCF_ValidNKey 0x01 /* True if info.nKey is valid */ #define BTCF_ValidOvfl 0x02 /* True if aOverflow is valid */ #define BTCF_AtLast 0x04 /* Cursor is pointing ot the last entry */ #define BTCF_WriteFlag 0x08 /* True if a write cursor */ #define BTCF_Incrblob 0x10 /* True if an incremental I/O handle */ /* ** Potential values for BtCursor.eState. ** ** CURSOR_INVALID: ** Cursor does not point to a valid entry. This can happen (for example) |
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u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */ MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */ }; /* ** Legal values for BtCursor.curFlags */ #define BTCF_WriteFlag 0x01 /* True if a write cursor */ #define BTCF_ValidNKey 0x02 /* True if info.nKey is valid */ #define BTCF_ValidOvfl 0x04 /* True if aOverflow is valid */ #define BTCF_AtLast 0x08 /* Cursor is pointing ot the last entry */ #define BTCF_Incrblob 0x10 /* True if an incremental I/O handle */ /* ** Potential values for BtCursor.eState. ** ** CURSOR_INVALID: ** Cursor does not point to a valid entry. This can happen (for example) |