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Reduce the size of the MemPage object by about 32 bytes. Other structure

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size optimizations.

FossilOrigin-Name: 21695c3476804477cb378b5a643196380e7e2281
This commit is contained in:
drh
2012-02-02 19:37:18 +00:00
parent 5a1785cbf2
commit 2cbd78b70e
5 changed files with 40 additions and 38 deletions
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42
src/btree.c
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@@ -870,12 +870,10 @@ static u8 *findOverflowCell(MemPage *pPage, int iCell){
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
for(i=pPage->nOverflow-1; i>=0; i--){
int k;
struct _OvflCell *pOvfl;
pOvfl = &pPage->aOvfl[i];
k = pOvfl->idx;
k = pPage->aiOvfl[i];
if( k<=iCell ){
if( k==iCell ){
return pOvfl->pCell;
return pPage->apOvfl[i];
}
iCell--;
}
@@ -5521,7 +5519,7 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
** If the cell content will fit on the page, then put it there. If it
** will not fit, then make a copy of the cell content into pTemp if
** pTemp is not null. Regardless of pTemp, allocate a new entry
** in pPage->aOvfl[] and make it point to the cell content (either
** in pPage->apOvfl[] and make it point to the cell content (either
** in pTemp or the original pCell) and also record its index.
** Allocating a new entry in pPage->aCell[] implies that
** pPage->nOverflow is incremented.
@@ -5555,7 +5553,8 @@ static void insertCell(
assert( i>=0 && i<=pPage->nCell+pPage->nOverflow );
assert( pPage->nCell<=MX_CELL(pPage->pBt) && MX_CELL(pPage->pBt)<=10921 );
assert( pPage->nOverflow<=ArraySize(pPage->aOvfl) );
assert( pPage->nOverflow<=ArraySize(pPage->apOvfl) );
assert( ArraySize(pPage->apOvfl)==ArraySize(pPage->aiOvfl) );
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
/* The cell should normally be sized correctly. However, when moving a
** malformed cell from a leaf page to an interior page, if the cell size
@@ -5572,9 +5571,9 @@ static void insertCell(
put4byte(pCell, iChild);
}
j = pPage->nOverflow++;
assert( j<(int)(sizeof(pPage->aOvfl)/sizeof(pPage->aOvfl[0])) );
pPage->aOvfl[j].pCell = pCell;
pPage->aOvfl[j].idx = (u16)i;
assert( j<(int)(sizeof(pPage->apOvfl)/sizeof(pPage->apOvfl[0])) );
pPage->apOvfl[j] = pCell;
pPage->aiOvfl[j] = (u16)i;
}else{
int rc = sqlite3PagerWrite(pPage->pDbPage);
if( rc!=SQLITE_OK ){
@@ -5722,7 +5721,7 @@ static int balance_quick(MemPage *pParent, MemPage *pPage, u8 *pSpace){
if( rc==SQLITE_OK ){
u8 *pOut = &pSpace[4];
u8 *pCell = pPage->aOvfl[0].pCell;
u8 *pCell = pPage->apOvfl[0];
u16 szCell = cellSizePtr(pPage, pCell);
u8 *pStop;
@@ -5832,7 +5831,7 @@ static int ptrmapCheckPages(MemPage **apPage, int nPage){
** map entries are also updated so that the parent page is page pTo.
**
** If pFrom is currently carrying any overflow cells (entries in the
** MemPage.aOvfl[] array), they are not copied to pTo.
** MemPage.apOvfl[] array), they are not copied to pTo.
**
** Before returning, page pTo is reinitialized using btreeInitPage().
**
@@ -5969,7 +5968,7 @@ static int balance_nonroot(
** is called (indirectly) from sqlite3BtreeDelete().
*/
assert( pParent->nOverflow==0 || pParent->nOverflow==1 );
assert( pParent->nOverflow==0 || pParent->aOvfl[0].idx==iParentIdx );
assert( pParent->nOverflow==0 || pParent->aiOvfl[0]==iParentIdx );
if( !aOvflSpace ){
return SQLITE_NOMEM;
@@ -6016,8 +6015,8 @@ static int balance_nonroot(
nMaxCells += 1+apOld[i]->nCell+apOld[i]->nOverflow;
if( (i--)==0 ) break;
if( i+nxDiv==pParent->aOvfl[0].idx && pParent->nOverflow ){
apDiv[i] = pParent->aOvfl[0].pCell;
if( i+nxDiv==pParent->aiOvfl[0] && pParent->nOverflow ){
apDiv[i] = pParent->apOvfl[0];
pgno = get4byte(apDiv[i]);
szNew[i] = cellSizePtr(pParent, apDiv[i]);
pParent->nOverflow = 0;
@@ -6458,7 +6457,7 @@ static int balance_nonroot(
MemPage *pOld = apCopy[0];
int nOverflow = pOld->nOverflow;
int iNextOld = pOld->nCell + nOverflow;
int iOverflow = (nOverflow ? pOld->aOvfl[0].idx : -1);
int iOverflow = (nOverflow ? pOld->aiOvfl[0] : -1);
j = 0; /* Current 'old' sibling page */
k = 0; /* Current 'new' sibling page */
for(i=0; i<nCell; i++){
@@ -6472,14 +6471,14 @@ static int balance_nonroot(
iNextOld = i + !leafData + pOld->nCell + pOld->nOverflow;
if( pOld->nOverflow ){
nOverflow = pOld->nOverflow;
iOverflow = i + !leafData + pOld->aOvfl[0].idx;
iOverflow = i + !leafData + pOld->aiOvfl[0];
}
isDivider = !leafData;
}
assert(nOverflow>0 || iOverflow<i );
assert(nOverflow<2 || pOld->aOvfl[0].idx==pOld->aOvfl[1].idx-1);
assert(nOverflow<3 || pOld->aOvfl[1].idx==pOld->aOvfl[2].idx-1);
assert(nOverflow<2 || pOld->aiOvfl[0]==pOld->aiOvfl[1]-1);
assert(nOverflow<3 || pOld->aiOvfl[1]==pOld->aiOvfl[2]-1);
if( i==iOverflow ){
isDivider = 1;
if( (--nOverflow)>0 ){
@@ -6600,7 +6599,10 @@ static int balance_deeper(MemPage *pRoot, MemPage **ppChild){
TRACE(("BALANCE: copy root %d into %d\n", pRoot->pgno, pChild->pgno));
/* Copy the overflow cells from pRoot to pChild */
memcpy(pChild->aOvfl, pRoot->aOvfl, pRoot->nOverflow*sizeof(pRoot->aOvfl[0]));
memcpy(pChild->aiOvfl, pRoot->aiOvfl,
pRoot->nOverflow*sizeof(pRoot->aiOvfl[0]));
memcpy(pChild->apOvfl, pRoot->apOvfl,
pRoot->nOverflow*sizeof(pRoot->apOvfl[0]));
pChild->nOverflow = pRoot->nOverflow;
/* Zero the contents of pRoot. Then install pChild as the right-child. */
@@ -6663,7 +6665,7 @@ static int balance(BtCursor *pCur){
#ifndef SQLITE_OMIT_QUICKBALANCE
if( pPage->hasData
&& pPage->nOverflow==1
&& pPage->aOvfl[0].idx==pPage->nCell
&& pPage->aiOvfl[0]==pPage->nCell
&& pParent->pgno!=1
&& pParent->nCell==iIdx
){