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Try to reduce the number of malloc() for user-defined functions. Begin

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transfering built-in functions over to the user-define function
mechanism. (CVS 399)

FossilOrigin-Name: c4f9e017b449d4036fa8d2bf77b931d4c31d74f7
This commit is contained in:
drh 2002-02-27 19:50:59 +00:00
parent 1350b030c1
commit dd5baa95e8
5 changed files with 78 additions and 30 deletions
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16
manifest
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@ -1,5 +1,5 @@
C Revise\sthe\sAPI\sfor\suser-defined\sfunctions.\s(CVS\s398)
D 2002-02-27T19:00:21
C Try\sto\sreduce\sthe\snumber\sof\smalloc()\sfor\suser-defined\sfunctions.\s\sBegin\ntransfering\sbuilt-in\sfunctions\sover\sto\sthe\suser-define\sfunction\nmechanism.\s(CVS\s399)
D 2002-02-27T19:50:59
F Makefile.in 50f1b3351df109b5774771350d8c1b8d3640130d
F Makefile.template 89e373b2dad0321df00400fa968dc14b61a03296
F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0
@ -24,7 +24,7 @@ F src/btree.h 8abeabfe6e0b1a990b64fa457592a6482f6674f3
F src/build.c 7ada2426caba70cb1072ba268bedb694b5018065
F src/delete.c 950d8f9097361419f1963875f9943344b469cf02
F src/expr.c ea2209a6bdefea23db988b470fc16dbf9d5b3a5a
F src/func.c f020b8c659c95ba1e46cab548ada582ebf8c6c3c
F src/func.c 3aeff18b277d9fdece117497dfff8119113ea412
F src/hash.c cc259475e358baaf299b00a2c7370f2b03dda892
F src/hash.h dca065dda89d4575f3176e75e9a3dc0f4b4fb8b9
F src/insert.c 164d2d5e943268a8ff0594e1947599e04df0ce11
@ -40,7 +40,7 @@ F src/random.c 19e8e00fe0df32a742f115773f57651be327cabe
F src/select.c a8e90e8f8366b72830010dd6a9bfbf121d2e9370
F src/shell.c 9f8249ca5b8f8aad40becd778c151b58c0d6109e
F src/shell.tcl 27ecbd63dd88396ad16d81ab44f73e6c0ea9d20e
F src/sqlite.h.in 681dd71442788f900439b624ad1ea2b98f178904
F src/sqlite.h.in a9b5772604265f98f3120573ef29e37b9d917216
F src/sqliteInt.h 4e746aa13c5fa39a31a89b73afcd33fa164e8b4f
F src/table.c 203a09d5d0009eeeb1f670370d52b4ce163a3b52
F src/tclsqlite.c b9cf346e95291cb4c4f1bf5ac1d77db6b8ad023d
@ -51,7 +51,7 @@ F src/threadtest.c 81f0598e0f031c1bd506af337fdc1b7e8dff263f
F src/tokenize.c 4b5d30590a744b9bb5605a92d1f620ab2e7e75af
F src/update.c 18971d265b0341574b7e3f73116e7947ddab0997
F src/util.c 40a12067fa7b18c7e0461b3256b1353c755b59ac
F src/vdbe.c 1a5378625687ced2acaa01e200cb63f07f780ad6
F src/vdbe.c d1efbaf24a745cf895432baf7642846e34a60f40
F src/vdbe.h 785b2f175f8be2af285d137125f30042ce8a53b5
F src/where.c 664be01b0ce9ffaecbde609afbd4d8d3e5ed1585
F test/all.test 7a8a8a7a579ed2bb4d8976d55402f21eacd58049
@ -127,7 +127,7 @@ F www/speed.tcl 83457b2bf6bb430900bd48ca3dd98264d9a916a5
F www/sqlite.tcl 8b5884354cb615049aed83039f8dfe1552a44279
F www/tclsqlite.tcl 829b393d1ab187fd7a5e978631b3429318885c49
F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218
P 085b0d671a1dac964693d69d866224de155dfe4c
R 06586960572c0c651395cc4d56fdf6f3
P 633951f0fa11c91f93aa2862df84691750c01e73
R 1ad564fc9fb52e423ae79061556e1e37
U drh
Z 67f54dfeaa3612775fa7c5da9d11c294
Z 9b3029f554c840c37489da7d32038cb8

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@ -1 +1 @@
633951f0fa11c91f93aa2862df84691750c01e73
c4f9e017b449d4036fa8d2bf77b931d4c31d74f7

52
src/func.c
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@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.4 2002/02/27 19:00:22 drh Exp $
** $Id: func.c,v 1.5 2002/02/27 19:50:59 drh Exp $
*/
#include <ctype.h>
#include <math.h>
@ -47,6 +47,44 @@ static void lowerFunc(sqlite_func *context, int argc, const char **argv){
}
}
/*
** An instance of the following structure holds the context of a
** sum() or avg() aggregate computation.
*/
typedef struct SumCtx SumCtx;
struct SumCtx {
double sum; /* Sum of terms */
};
/*
** Routines used to compute the sum or average.
*/
static void sumStep(sqlite_func *context, int argc, const char **argv){
SumCtx *p;
double x;
if( argc<1 ) return;
p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 ) return;
x = argv[0] ? atof(argv[0]) : 0.0;
p->sum += x;
}
static void sumFinalize(sqlite_func *context){
SumCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p));
if( p ){
sqlite_set_result_double(context, p->sum);
}
}
static void avgFinalize(sqlite_func *context){
SumCtx *p;
double rN;
p = sqlite_aggregate_context(context, sizeof(*p));
rN = sqlite_aggregate_count(context);
if( p && rN>0.0 ){
sqlite_set_result_double(context, p->sum/rN);
}
}
/*
** An instance of the following structure holds the context of a
** variance or standard deviation computation.
@ -55,7 +93,6 @@ typedef struct StdDevCtx StdDevCtx;
struct StdDevCtx {
double sum; /* Sum of terms */
double sum2; /* Sum of the squares of terms */
int n; /* Number of terms seen so far */
};
/*
@ -67,20 +104,21 @@ static void stdDevStep(sqlite_func *context, int argc, const char **argv){
if( argc<1 ) return;
p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 ) return;
x = atof(argv[0]);
x = argv[0] ? atof(argv[0]) : 0.0;
p->sum += x;
p->sum2 += x*x;
p->n++;
}
static void stdDevFinalize(sqlite_func *context){
double rN = sqlite_aggregate_count(context);
StdDevCtx *p = sqlite_aggregate_context(context, sizeof(*p));
if( p && p->n>1 ){
double rN = p->n;
if( p && rN>1.0 ){
sqlite_set_result_double(context,
sqrt((p->sum2 - p->sum*p->sum/rN)/(rN-1.0)));
}
}
/*
** This function registered all of the above C functions as SQL
** functions. This should be the only routine in this file with
@ -90,4 +128,6 @@ void sqliteRegisterBuildinFunctions(sqlite *db){
sqlite_create_function(db, "upper", 1, upperFunc, 0);
sqlite_create_function(db, "lower", 1, lowerFunc, 0);
sqlite_create_aggregate(db, "stddev", 1, stdDevStep, stdDevFinalize, 0);
sqlite_create_aggregate(db, "x_sum", 1, sumStep, sumFinalize, 0);
sqlite_create_aggregate(db, "x_avg", 1, sumStep, avgFinalize, 0);
}

14
src/sqlite.h.in
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@ -12,7 +12,7 @@
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.27 2002/02/27 19:00:22 drh Exp $
** @(#) $Id: sqlite.h.in,v 1.28 2002/02/27 19:50:59 drh Exp $
*/
#ifndef _SQLITE_H_
#define _SQLITE_H_
@ -391,7 +391,7 @@ int sqlite_create_aggregate(
/*
** The user function implementations call one of the following four routines
** in order to return their results. The first parameter to each of these
** routines is a copy of the first argument to xFunc() or xFinialize()
** routines is a copy of the first argument to xFunc() or xFinialize().
** The second parameter to these routines is the result to be returned.
** A NULL can be passed as the second parameter to sqlite_set_result_string()
** in order to return a NULL result.
@ -419,8 +419,8 @@ void sqlite_set_result_error(sqlite_func*,const char*,int);
void *sqlite_user_data(sqlite_func*);
/*
** User aggregate functions use the following routine to allocate
** a structure for storing their context. The first time this routine
** Aggregate functions use the following routine to allocate
** a structure for storing their state. The first time this routine
** is called for a particular aggregate, a new structure of size nBytes
** is allocated, zeroed, and returned. On subsequent calls (for the
** same aggregate instance) the same buffer is returned. The implementation
@ -431,9 +431,9 @@ void *sqlite_user_data(sqlite_func*);
void *sqlite_aggregate_context(sqlite_func*, int nBytes);
/*
** The next return returns the number of calls to xStep for a particular
** aggregate function instance. The current call to xStep counts so the
** function always returns at least 1.
** The next routine returns the number of calls to xStep for a particular
** aggregate function instance. The current call to xStep counts so this
** routine always returns at least 1.
*/
int sqlite_aggregate_count(sqlite_func*);

24
src/vdbe.c
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@ -30,7 +30,7 @@
** But other routines are also provided to help in building up
** a program instruction by instruction.
**
** $Id: vdbe.c,v 1.124 2002/02/27 19:00:22 drh Exp $
** $Id: vdbe.c,v 1.125 2002/02/27 19:50:59 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@ -618,7 +618,11 @@ void *sqlite_user_data(sqlite_func *p){
void *sqlite_aggregate_context(sqlite_func *p, int nByte){
assert( p && p->pFunc && p->pFunc->xStep );
if( p->pAgg==0 ){
p->pAgg = sqliteMalloc( nByte );
if( nByte<=NBFS ){
p->pAgg = (void*)p->z;
}else{
p->pAgg = sqliteMalloc( nByte );
}
}
return p->pAgg;
}
@ -652,18 +656,21 @@ static void AggReset(Agg *pAgg){
AggElem *pElem = sqliteHashData(p);
assert( pAgg->apFunc!=0 );
for(i=0; i<pAgg->nMem; i++){
if( pAgg->apFunc[i] && (pElem->aMem[i].s.flags & STK_AggCtx)!=0 ){
Mem *pMem = &pElem->aMem[i];
if( pAgg->apFunc[i] && (pMem->s.flags & STK_AggCtx)!=0 ){
sqlite_func ctx;
ctx.s.flags = STK_Null;
ctx.z = 0;
ctx.pAgg = pElem->aMem[i].z;
ctx.cnt = pElem->aMem[i].s.i;
ctx.pAgg = pMem->z;
ctx.cnt = pMem->s.i;
ctx.isStep = 0;
ctx.isError = 0;
(*pAgg->apFunc[i]->xFinalize)(&ctx);
}
if( pElem->aMem[i].s.flags & (STK_Dyn | STK_AggCtx) ){
sqliteFree(pElem->aMem[i].z);
if( pMem->z!=0 && pMem->z!=pMem->s.z ){
sqliteFree(pMem->z);
}
}else if( pMem->s.flags & STK_Dyn ){
sqliteFree(pMem->z);
}
}
sqliteFree(pElem);
@ -4437,6 +4444,7 @@ case OP_AggFunc: {
VERIFY( if( i<0 || i>=p->agg.nMem ) goto bad_instruction; )
ctx.pFunc = (UserFunc*)pOp->p3;
pMem = &p->agg.pCurrent->aMem[i];
ctx.z = pMem->s.z;
ctx.pAgg = pMem->z;
ctx.cnt = ++pMem->s.i;
ctx.isError = 0;