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Improved interface to the Mem object handling. Small size reduction and

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performance increase.

FossilOrigin-Name: 4e437844322cc20eef92928b53fa6b37eded586e
This commit is contained in:
drh 2014-09-17 14:52:46 +00:00
parent 6b478bcd9e
commit 0725cabe3a
6 changed files with 63 additions and 68 deletions
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18
manifest
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@ -1,5 +1,5 @@
C Continuing\scleanup\sof\smemory\sregister\smemory\sallocation\shandling.
D 2014-09-16T21:54:11.409
C Improved\sinterface\sto\sthe\sMem\sobject\shandling.\s\sSmall\ssize\sreduction\sand\nperformance\sincrease.
D 2014-09-17T14:52:46.727
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in cf57f673d77606ab0f2d9627ca52a9ba1464146a
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -288,13 +288,13 @@ F src/update.c 729f6f18fc27740591d085e1172cebe311144bf0
F src/utf.c 8f634b93d41c089029dd503161a7d3e685d59a9c
F src/util.c 4006c01772bd8d8ac4306d523bbcee41d3e392d8
F src/vacuum.c 59f03f92bcff57faa6a8ca256eb29ccddfb0614a
F src/vdbe.c 6a45baf86fcc6c294d57e0aef8c9f2c54f07ff18
F src/vdbe.c d39487782c0c6a2448bd1b351eba6a2dce101343
F src/vdbe.h 09f5b4e3719fa454f252322b1cdab5cf1f361327
F src/vdbeInt.h dc1743de339f5556cc6687219cf8727ad0d35f72
F src/vdbeapi.c 4d2aa56efa1b4a010012466bf8e97dbf179081a6
F src/vdbeInt.h 9d398055c873980b61ce0f7bf82140a8e4e2ccbc
F src/vdbeapi.c c6e63f913bcb12977731a8b12e7e5c5762981527
F src/vdbeaux.c 211ad29d51e01c44a0db1ab69b74c11c8de1cccf
F src/vdbeblob.c 848238dc73e93e48432991bb5651bf87d865eca4
F src/vdbemem.c 9615c9aba37ec42bd6ea705d3d72379c77720b00
F src/vdbemem.c cf552a404f0e73a48bd266699aa27f0df26b096b
F src/vdbesort.c 09efa5e5098d1a159cd21f588eb118e4fe87cfde
F src/vdbetrace.c 16d39c1ef7d1f4a3a7464bea3b7b4bdd7849c415
F src/vtab.c 019dbfd0406a7447c990e1f7bd1dfcdb8895697f
@ -1198,7 +1198,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
P 78fb8838d80b229418c347c63579989432e1af7d
R 386107f24552e12c4df7dfd8a184a53a
P 2598aedc5dd2bac67e2e518a31f2803e469c2ba6
R f63e98cc1bcae44946c79c20cdee7610
U drh
Z 90927a6d3c50834bddf5d6b0b977d8d6
Z 1559702e8c6b5218f324b4f43d7dc2c7

2
manifest.uuid
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@ -1 +1 @@
2598aedc5dd2bac67e2e518a31f2803e469c2ba6
4e437844322cc20eef92928b53fa6b37eded586e

18
src/vdbe.c
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@ -640,7 +640,7 @@ int sqlite3VdbeExec(
assert( pOp->p2<=(p->nMem-p->nCursor) );
pOut = &aMem[pOp->p2];
memAboutToChange(p, pOut);
VdbeMemReleaseExtern(pOut);
if( VdbeMemDynamic(pOut) ) sqlite3VdbeMemSetNull(pOut);
pOut->flags = MEM_Int;
}
@ -1079,7 +1079,7 @@ case OP_Null: { /* out2-prerelease */
while( cnt>0 ){
pOut++;
memAboutToChange(p, pOut);
VdbeMemReleaseExtern(pOut);
sqlite3VdbeMemSetNull(pOut);
pOut->flags = nullFlag;
cnt--;
}
@ -2107,10 +2107,10 @@ case OP_Or: { /* same as TK_OR, in1, in2, out3 */
case OP_Not: { /* same as TK_NOT, in1, out2 */
pIn1 = &aMem[pOp->p1];
pOut = &aMem[pOp->p2];
if( pIn1->flags & MEM_Null ){
sqlite3VdbeMemSetNull(pOut);
}else{
sqlite3VdbeMemSetInt64(pOut, !sqlite3VdbeIntValue(pIn1));
if( (pIn1->flags & MEM_Null)==0 ){
pOut->flags = MEM_Int;
pOut->u.i = !sqlite3VdbeIntValue(pIn1);
}
break;
}
@ -2125,10 +2125,10 @@ case OP_Not: { /* same as TK_NOT, in1, out2 */
case OP_BitNot: { /* same as TK_BITNOT, in1, out2 */
pIn1 = &aMem[pOp->p1];
pOut = &aMem[pOp->p2];
if( pIn1->flags & MEM_Null ){
sqlite3VdbeMemSetNull(pOut);
}else{
sqlite3VdbeMemSetInt64(pOut, ~sqlite3VdbeIntValue(pIn1));
if( (pIn1->flags & MEM_Null)==0 ){
pOut->flags = MEM_Int;
pOut->u.i = ~sqlite3VdbeIntValue(pIn1);
}
break;
}
@ -2437,7 +2437,7 @@ case OP_Column: {
assert( p2<pC->nHdrParsed );
assert( rc==SQLITE_OK );
assert( sqlite3VdbeCheckMemInvariants(pDest) );
VdbeMemReleaseExtern(pDest);
if( VdbeMemDynamic(pDest) ) sqlite3VdbeMemSetNull(pDest);
if( pC->szRow>=aOffset[p2+1] ){
/* This is the common case where the desired content fits on the original
** page - where the content is not on an overflow page */

3
src/vdbeInt.h
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@ -429,11 +429,8 @@ int sqlite3VdbeMemNumerify(Mem*);
void sqlite3VdbeMemCast(Mem*,u8,u8);
int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,int,Mem*);
void sqlite3VdbeMemRelease(Mem *p);
void sqlite3VdbeMemReleaseExternal(Mem *p);
#define VdbeMemDynamic(X) \
(((X)->flags&(MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))!=0)
#define VdbeMemReleaseExtern(X) \
if( VdbeMemDynamic(X) ) sqlite3VdbeMemReleaseExternal(X);
int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
const char *sqlite3OpcodeName(int);
int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);

3
src/vdbeapi.c
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@ -662,8 +662,7 @@ static SQLITE_NOINLINE void *createAggContext(sqlite3_context *p, int nByte){
Mem *pMem = p->pMem;
assert( (pMem->flags & MEM_Agg)==0 );
if( nByte<=0 ){
sqlite3VdbeMemReleaseExternal(pMem);
pMem->flags = MEM_Null;
sqlite3VdbeMemSetNull(pMem);
pMem->z = 0;
}else{
sqlite3VdbeMemGrow(pMem, nByte, 0);

81
src/vdbemem.c
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@ -48,7 +48,6 @@ int sqlite3VdbeCheckMemInvariants(Mem *p){
((p->flags&MEM_Static)!=0 ? 1 : 0) == 1
);
}
return 1;
}
#endif
@ -121,9 +120,8 @@ int sqlite3VdbeMemGrow(Mem *pMem, int n, int bPreserve){
pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
}
if( pMem->zMalloc==0 ){
VdbeMemReleaseExtern(pMem);
sqlite3VdbeMemSetNull(pMem);
pMem->z = 0;
pMem->flags = MEM_Null;
return SQLITE_NOMEM;
}
}
@ -311,23 +309,22 @@ int sqlite3VdbeMemFinalize(Mem *pMem, FuncDef *pFunc){
/*
** If the memory cell contains a value that must be freed by
** invoking an external callback, then free it now.
** invoking the external callback in Mem.xDel, then this routine
** will free that value. It also sets Mem.flags to MEM_Null.
**
** This routine does NOT do any of the following:
** (1) Set the Mem.flags field to a rational value.
** (2) Free memory held by Mem.zMalloc
** The caller is expected to take care of setting Mem.flags appropriately.
**
** The VdbeMemReleaseExtern() macro invokes this routine if only if there
** is work for this routine to do.
** This is a helper routine for sqlite3VdbeMemSetNull() and
** for sqlite3VdbeMemRelease(). Use those other routines as the
** entry point for releasing Mem resources.
*/
void sqlite3VdbeMemReleaseExternal(Mem *p){
static SQLITE_NOINLINE void vdbeMemClearExternAndSetNull(Mem *p){
assert( p->db==0 || sqlite3_mutex_held(p->db->mutex) );
assert( VdbeMemDynamic(p) );
if( p->flags&MEM_Agg ){
sqlite3VdbeMemFinalize(p, p->u.pDef);
assert( (p->flags & MEM_Agg)==0 );
sqlite3VdbeMemRelease(p);
}else if( p->flags&MEM_Dyn ){
testcase( p->flags & MEM_Dyn );
}
if( p->flags&MEM_Dyn ){
assert( (p->flags&MEM_RowSet)==0 );
assert( p->xDel!=SQLITE_DYNAMIC && p->xDel!=0 );
p->xDel((void *)p->z);
@ -347,12 +344,12 @@ void sqlite3VdbeMemReleaseExternal(Mem *p){
** by p->xDel and memory in p->zMalloc.
**
** This is a helper routine invoked by sqlite3VdbeMemRelease() in
** the uncommon case when there really is memory in p that needs
** to be freeing.
** the unusual case where there really is memory in p that needs
** to be freed.
*/
static SQLITE_NOINLINE void vdbeMemRelease(Mem *p){
static SQLITE_NOINLINE void vdbeMemClear(Mem *p){
if( VdbeMemDynamic(p) ){
sqlite3VdbeMemReleaseExternal(p);
vdbeMemClearExternAndSetNull(p);
}
if( p->zMalloc ){
sqlite3DbFree(p->db, p->zMalloc);
@ -362,18 +359,19 @@ static SQLITE_NOINLINE void vdbeMemRelease(Mem *p){
}
/*
** Release any memory held by the Mem. This may leave the Mem.flags in an
** inconsistent state, for example with (Mem.z==0) and (Mem.flags==MEM_Str).
** Release any memory resources held by the Mem. Both the memory that is
** free by Mem.xDel and the Mem.zMalloc allocation are freed.
**
** This routine releases both the Mem.xDel space and the Mem.zMalloc space.
** Use sqlite3VdbeMemReleaseExternal() to release just the Mem.xDel space.
** Use this routine prior to clean up prior to abandoning a Mem, or to
** reset a Mem back to its minimum memory utilization.
**
** Use sqlite3VdbeMemSetNull() to release just the Mem.xDel space
** prior to inserting new content into the Mem.
*/
void sqlite3VdbeMemRelease(Mem *p){
assert( sqlite3VdbeCheckMemInvariants(p) );
if( VdbeMemDynamic(p) || p->zMalloc ){
vdbeMemRelease(p);
}else{
p->z = 0;
vdbeMemClear(p);
}
assert( p->xDel==0 );
}
@ -590,10 +588,19 @@ void sqlite3VdbeMemCast(Mem *pMem, u8 aff, u8 encoding){
/*
** Delete any previous value and set the value stored in *pMem to NULL.
**
** This routine calls the Mem.xDel destructor to dispose of values that
** require the destructor. But it preserves the Mem.zMalloc memory allocation.
** To free all resources, use sqlite3VdbeMemRelease(), which both calls this
** routine to invoke the destructor and deallocates Mem.zMalloc.
**
** Use this routine to reset the Mem prior to insert a new value.
**
** Use sqlite3VdbeMemRelease() to complete erase the Mem prior to abandoning it.
*/
void sqlite3VdbeMemSetNull(Mem *pMem){
if( VdbeMemDynamic(pMem) ){
sqlite3VdbeMemReleaseExternal(pMem);
vdbeMemClearExternAndSetNull(pMem);
}else{
pMem->flags = MEM_Null;
}
@ -613,14 +620,7 @@ void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
if( n<0 ) n = 0;
pMem->u.nZero = n;
pMem->enc = SQLITE_UTF8;
#ifdef SQLITE_OMIT_INCRBLOB
sqlite3VdbeMemGrow(pMem, n, 0);
if( pMem->z ){
pMem->n = n;
memset(pMem->z, 0, n);
}
#endif
pMem->z = 0;
}
/*
@ -629,7 +629,7 @@ void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
** a 64-bit integer.
*/
static SQLITE_NOINLINE void vdbeReleaseAndSetInt64(Mem *pMem, i64 val){
sqlite3VdbeMemReleaseExternal(pMem);
sqlite3VdbeMemSetNull(pMem);
pMem->u.i = val;
pMem->flags = MEM_Int;
}
@ -653,10 +653,8 @@ void sqlite3VdbeMemSetInt64(Mem *pMem, i64 val){
** manifest type REAL.
*/
void sqlite3VdbeMemSetDouble(Mem *pMem, double val){
if( sqlite3IsNaN(val) ){
sqlite3VdbeMemSetNull(pMem);
}else{
sqlite3VdbeMemRelease(pMem);
if( !sqlite3IsNaN(val) ){
pMem->r = val;
pMem->flags = MEM_Real;
}
@ -736,7 +734,7 @@ void sqlite3VdbeMemAboutToChange(Vdbe *pVdbe, Mem *pMem){
void sqlite3VdbeMemShallowCopy(Mem *pTo, const Mem *pFrom, int srcType){
assert( (pFrom->flags & MEM_RowSet)==0 );
assert( pTo->db==pFrom->db );
VdbeMemReleaseExtern(pTo);
if( VdbeMemDynamic(pTo) ) vdbeMemClearExternAndSetNull(pTo);
memcpy(pTo, pFrom, MEMCELLSIZE);
assert( pTo->xDel==0 );
if( (pFrom->flags&MEM_Static)==0 ){
@ -755,7 +753,7 @@ int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
assert( pTo->db==pFrom->db );
assert( (pFrom->flags & MEM_RowSet)==0 );
VdbeMemReleaseExtern(pTo);
if( VdbeMemDynamic(pTo) ) vdbeMemClearExternAndSetNull(pTo);
memcpy(pTo, pFrom, MEMCELLSIZE);
pTo->flags &= ~MEM_Dyn;
assert( pTo->xDel==0 );
@ -832,7 +830,8 @@ int sqlite3VdbeMemSetStr(
if( nByte<0 ){
assert( enc!=0 );
if( enc==SQLITE_UTF8 ){
for(nByte=0; nByte<=iLimit && z[nByte]; nByte++){}
nByte = sqlite3Strlen30(z);
if( nByte>iLimit ) nByte = iLimit+1;
}else{
for(nByte=0; nByte<=iLimit && (z[nByte] | z[nByte+1]); nByte+=2){}
}