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Overview
| Comment: | Rearrange fields in the Parse object for a tighter packing, resulting in an 8% size reduction on x64. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
3e1a3f68d7457ff708222a3448404b59 |
| User & Date: | drh 2014-02-04 15:55:25 |
Context
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2014-02-04
| ||
| 20:46 | Remove the SF_Materialize flag from the SELECT object as it does not accomplish anything useful. (check-in: 65d5dcdd user: drh tags: trunk) | |
| 15:55 | Rearrange fields in the Parse object for a tighter packing, resulting in an 8% size reduction on x64. (check-in: 3e1a3f68 user: drh tags: trunk) | |
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2014-02-03
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| 17:04 | Performance optimizations in sqlite3PcacheFetch(). (check-in: b60cc11e user: drh tags: trunk) | |
Changes
Changes to src/sqliteInt.h.
2354 2354 int iRangeReg; /* First register in temporary register block */ 2355 2355 int nErr; /* Number of errors seen */ 2356 2356 int nTab; /* Number of previously allocated VDBE cursors */ 2357 2357 int nMem; /* Number of memory cells used so far */ 2358 2358 int nSet; /* Number of sets used so far */ 2359 2359 int nOnce; /* Number of OP_Once instructions so far */ 2360 2360 int nOpAlloc; /* Number of slots allocated for Vdbe.aOp[] */ 2361 - int nLabel; /* Number of labels used */ 2362 - int *aLabel; /* Space to hold the labels */ 2363 2361 int iFixedOp; /* Never back out opcodes iFixedOp-1 or earlier */ 2364 2362 int ckBase; /* Base register of data during check constraints */ 2365 2363 int iPartIdxTab; /* Table corresponding to a partial index */ 2366 2364 int iCacheLevel; /* ColCache valid when aColCache[].iLevel<=iCacheLevel */ 2367 2365 int iCacheCnt; /* Counter used to generate aColCache[].lru values */ 2366 + int nLabel; /* Number of labels used */ 2367 + int *aLabel; /* Space to hold the labels */ 2368 2368 struct yColCache { 2369 2369 int iTable; /* Table cursor number */ 2370 - int iColumn; /* Table column number */ 2370 + i16 iColumn; /* Table column number */ 2371 2371 u8 tempReg; /* iReg is a temp register that needs to be freed */ 2372 2372 int iLevel; /* Nesting level */ 2373 2373 int iReg; /* Reg with value of this column. 0 means none. */ 2374 2374 int lru; /* Least recently used entry has the smallest value */ 2375 2375 } aColCache[SQLITE_N_COLCACHE]; /* One for each column cache entry */ 2376 2376 ExprList *pConstExpr;/* Constant expressions */ 2377 + Token constraintName;/* Name of the constraint currently being parsed */ 2377 2378 yDbMask writeMask; /* Start a write transaction on these databases */ 2378 2379 yDbMask cookieMask; /* Bitmask of schema verified databases */ 2379 2380 int cookieGoto; /* Address of OP_Goto to cookie verifier subroutine */ 2380 2381 int cookieValue[SQLITE_MAX_ATTACHED+2]; /* Values of cookies to verify */ 2381 2382 int regRowid; /* Register holding rowid of CREATE TABLE entry */ 2382 2383 int regRoot; /* Register holding root page number for new objects */ 2383 2384 int nMaxArg; /* Max args passed to user function by sub-program */ 2384 - Token constraintName;/* Name of the constraint currently being parsed */ 2385 2385 #ifndef SQLITE_OMIT_SHARED_CACHE 2386 2386 int nTableLock; /* Number of locks in aTableLock */ 2387 2387 TableLock *aTableLock; /* Required table locks for shared-cache mode */ 2388 2388 #endif 2389 2389 AutoincInfo *pAinc; /* Information about AUTOINCREMENT counters */ 2390 2390 2391 2391 /* Information used while coding trigger programs. */ ................................................................................ 2396 2396 u32 nQueryLoop; /* Est number of iterations of a query (10*log2(N)) */ 2397 2397 u32 oldmask; /* Mask of old.* columns referenced */ 2398 2398 u32 newmask; /* Mask of new.* columns referenced */ 2399 2399 u8 eTriggerOp; /* TK_UPDATE, TK_INSERT or TK_DELETE */ 2400 2400 u8 eOrconf; /* Default ON CONFLICT policy for trigger steps */ 2401 2401 u8 disableTriggers; /* True to disable triggers */ 2402 2402 2403 - /* Above is constant between recursions. Below is reset before and after 2404 - ** each recursion */ 2403 + /************************************************************************ 2404 + ** Above is constant between recursions. Below is reset before and after 2405 + ** each recursion. The boundary between these two regions is determined 2406 + ** using offsetof(Parse,nVar) so the nVar field must be the first field 2407 + ** in the recursive region. 2408 + ************************************************************************/ 2405 2409 2406 2410 int nVar; /* Number of '?' variables seen in the SQL so far */ 2407 2411 int nzVar; /* Number of available slots in azVar[] */ 2408 2412 u8 iPkSortOrder; /* ASC or DESC for INTEGER PRIMARY KEY */ 2413 + u8 bFreeWith; /* True if pWith should be freed with parser */ 2409 2414 u8 explain; /* True if the EXPLAIN flag is found on the query */ 2410 2415 #ifndef SQLITE_OMIT_VIRTUALTABLE 2411 2416 u8 declareVtab; /* True if inside sqlite3_declare_vtab() */ 2412 2417 int nVtabLock; /* Number of virtual tables to lock */ 2413 2418 #endif 2414 2419 int nAlias; /* Number of aliased result set columns */ 2415 2420 int nHeight; /* Expression tree height of current sub-select */ ................................................................................ 2428 2433 #ifndef SQLITE_OMIT_VIRTUALTABLE 2429 2434 Token sArg; /* Complete text of a module argument */ 2430 2435 Table **apVtabLock; /* Pointer to virtual tables needing locking */ 2431 2436 #endif 2432 2437 Table *pZombieTab; /* List of Table objects to delete after code gen */ 2433 2438 TriggerPrg *pTriggerPrg; /* Linked list of coded triggers */ 2434 2439 With *pWith; /* Current WITH clause, or NULL */ 2435 - u8 bFreeWith; /* True if pWith should be freed with parser */ 2436 2440 }; 2437 2441 2438 2442 /* 2439 2443 ** Return true if currently inside an sqlite3_declare_vtab() call. 2440 2444 */ 2441 2445 #ifdef SQLITE_OMIT_VIRTUALTABLE 2442 2446 #define IN_DECLARE_VTAB 0