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Overview
Comment: | separate Select structure (CVS 51) |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
ce45dea902f9010a1c2c9ba3550dd789 |
User & Date: | drh 2000-06-05 16:01:39.000 |
Context
2000-06-05
| ||
18:54 | :-) (CVS 52) (check-in: c02268bdf4 user: drh tags: trunk) | |
16:01 | separate Select structure (CVS 51) (check-in: ce45dea902 user: drh tags: trunk) | |
02:07 | :-) (CVS 50) (check-in: 1cf2873d55 user: drh tags: trunk) | |
Changes
Changes to src/main.c.
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22 23 24 25 26 27 28 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** | | < | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** ** $Id: main.c,v 1.9 2000/06/05 16:01:39 drh Exp $ */ #include "sqliteInt.h" /* ** This is the callback routine for the code that initializes the ** database. Each callback contains text of a CREATE TABLE or ** CREATE INDEX statement that must be parsed to yield the internal ** structures that describe the tables. */ static int sqliteOpenCb(void *pDb, int argc, char **argv, char **azColName){ sqlite *db = (sqlite*)pDb; Parse sParse; int nErr; if( argc!=1 ) return 0; memset(&sParse, 0, sizeof(sParse)); sParse.db = db; sParse.initFlag = 1; nErr = sqliteRunParser(&sParse, argv[0], 0); return nErr; |
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Changes to src/parse.y.
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22 23 24 25 26 27 28 | ** ************************************************************************* ** This file contains SQLite's grammar for SQL. Process this file ** using the lemon parser generator to generate C code that runs ** the parser. Lemon will also generate a header file containing ** numeric codes for all of the tokens. ** | | | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | ** ************************************************************************* ** This file contains SQLite's grammar for SQL. Process this file ** using the lemon parser generator to generate C code that runs ** the parser. Lemon will also generate a header file containing ** numeric codes for all of the tokens. ** ** @(#) $Id: parse.y,v 1.9 2000/06/05 16:01:39 drh Exp $ */ %token_prefix TK_ %token_type {Token} %extra_argument {Parse *pParse} %syntax_error { sqliteSetNString(&pParse->zErrMsg,"syntax error near \"",0,TOKEN.z,TOKEN.n, "\"", 1, 0); |
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128 129 130 131 132 133 134 | // The next command format is dropping tables. // cmd ::= DROP TABLE id(X). {sqliteDropTable(pParse,&X);} // The select statement // | | < | > > | > | | > > | > > > > > > > > > < > | | > > > | 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | // The next command format is dropping tables. // cmd ::= DROP TABLE id(X). {sqliteDropTable(pParse,&X);} // The select statement // cmd ::= select(X). { sqliteSelect(pParse, X, 0, 0); sqliteSelectDelete(X); } %type select {Select*} %destructor select {sqliteSelectDelete($$);} select(A) ::= SELECT distinct(D) selcollist(W) from(X) where_opt(Y) orderby_opt(Z). { A = sqliteSelectNew(W,X,Y,0,0,Z,D); } // The "distinct" nonterminal is true (1) if the DISTINCT keyword is // present and false (0) if it is not. // %type distinct {int} distinct(A) ::= DISTINCT. {A = 1;} distinct(A) ::= . {A = 0;} // selcollist is a list of expressions that are to become the return // values of the SELECT statement. In the case of "SELECT * FROM ..." // the selcollist value is NULL. // %type selcollist {ExprList*} %destructor selcollist {sqliteExprListDelete($$);} %type sclp {ExprList*} %destructor sclp {sqliteExprListDelete($$);} sclp(A) ::= selcollist(X) COMMA. {A = X;} sclp(A) ::= . {A = 0;} selcollist(A) ::= STAR. {A = 0;} selcollist(A) ::= sclp(P) expr(X). {A = sqliteExprListAppend(P,X,0);} selcollist(A) ::= sclp(P) expr(X) as ID(Y). {A = sqliteExprListAppend(P,X,&Y);} selcollist(A) ::= sclp(P) expr(X) as STRING(Y). {A = sqliteExprListAppend(P,X,&Y);} as ::= . as ::= AS. %type seltablist {IdList*} %destructor seltablist {sqliteIdListDelete($$);} %type stl_prefix {IdList*} %destructor stl_prefix {sqliteIdListDelete($$);} %type from {IdList*} %destructor from {sqliteIdListDelete($$);} |
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175 176 177 178 179 180 181 | %type sortlist {ExprList*} %destructor sortlist {sqliteExprListDelete($$);} %type sortitem {Expr*} %destructor sortitem {sqliteExprDelete($$);} orderby_opt(A) ::= . {A = 0;} orderby_opt(A) ::= ORDER BY sortlist(X). {A = X;} | | < | | | | < | | | | 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 | %type sortlist {ExprList*} %destructor sortlist {sqliteExprListDelete($$);} %type sortitem {Expr*} %destructor sortitem {sqliteExprDelete($$);} orderby_opt(A) ::= . {A = 0;} orderby_opt(A) ::= ORDER BY sortlist(X). {A = X;} sortlist(A) ::= sortlist(X) COMMA sortitem(Y) sortorder(Z). { A = sqliteExprListAppend(X,Y,0); A->a[A->nExpr-1].idx = Z; /* 0 for ascending order, 1 for decending */ } sortlist(A) ::= sortitem(Y) sortorder(Z). { A = sqliteExprListAppend(0,Y,0); A->a[0].idx = Z; } sortitem(A) ::= expr(X). {A = X;} %type sortorder {int} sortorder(A) ::= ASC. {A = 0;} sortorder(A) ::= DESC. {A = 1;} sortorder(A) ::= . {A = 0;} |
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Changes to src/select.c.
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20 21 22 23 24 25 26 | ** drh@hwaci.com ** http://www.hwaci.com/drh/ ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle SELECT statements. ** | | > | | < | | | > > | > > > > > > > > > > > > > > | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | | 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | ** drh@hwaci.com ** http://www.hwaci.com/drh/ ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle SELECT statements. ** ** $Id: select.c,v 1.7 2000/06/05 16:01:39 drh Exp $ */ #include "sqliteInt.h" /* ** Allocate a new Select structure and return a pointer to that ** structure. */ Select *sqliteSelectNew( ExprList *pEList, IdList *pSrc, Expr *pWhere, ExprList *pGroupBy, Expr *pHaving, ExprList *pOrderBy, int isDistinct ){ Select *pNew; pNew = sqliteMalloc( sizeof(*pNew) ); if( pNew==0 ) return 0; pNew->pEList = pEList; pNew->pSrc = pSrc; pNew->pWhere = pWhere; pNew->pGroupBy = pGroupBy; pNew->pHaving = pHaving; pNew->pOrderBy = pOrderBy; pNew->isDistinct = isDistinct; return pNew; } /* ** Delete the given Select structure and all of its substructures. */ void sqliteSelectDelete(Select *p){ sqliteExprListDelete(p->pEList); sqliteIdListDelete(p->pSrc); sqliteExprDelete(p->pWhere); sqliteExprListDelete(p->pGroupBy); sqliteExprDelete(p->pHaving); sqliteExprListDelete(p->pOrderBy); sqliteFree(p); } /* ** Generate code for the given SELECT statement. ** ** If pDest==0 and iMem<0, then the results of the query are sent to ** the callback function. If pDest!=0 then the results are written to ** the single table specified. If pDest==0 and iMem>=0 then the result ** should be a single value which is then stored in memory location iMem ** of the virtual machine. ** ** This routine returns the number of errors. If any errors are ** encountered, then an appropriate error message is left in ** pParse->zErrMsg. ** ** This routine does NOT free the Select structure passed in. The ** calling function needs to do that. */ int sqliteSelect( Parse *pParse, /* The parser context */ Select *p, /* The SELECT statement being coded. */ Table *pDest, /* Write results here, if not NULL */ int iMem /* Save result in this memory location, if >=0 */ ){ int i, j; WhereInfo *pWInfo; Vdbe *v; int isAgg = 0; /* True for select lists like "count(*)" */ ExprList *pEList; /* List of fields to extract. NULL means "*" */ IdList *pTabList; /* List of tables to select from */ Expr *pWhere; /* The WHERE clause. May be NULL */ ExprList *pOrderBy; /* The ORDER BY clause. May be NULL */ int distinct; /* If true, only output distinct results */ pEList = p->pEList; pTabList = p->pSrc; pWhere = p->pWhere; pOrderBy = p->pOrderBy; distinct = p->isDistinct; /* ** Do not even attempt to generate any code if we have already seen ** errors before this routine starts. */ if( pParse->nErr>0 ) return 0; /* Look up every table in the table list. */ for(i=0; i<pTabList->nId; i++){ pTabList->a[i].pTab = sqliteFindTable(pParse->db, pTabList->a[i].zName); if( pTabList->a[i].pTab==0 ){ sqliteSetString(&pParse->zErrMsg, "no such table: ", pTabList->a[i].zName, 0); pParse->nErr++; return 1; } } /* If the list of fields to retrieve is "*" then replace it with ** a list of all fields from all tables. */ if( pEList==0 ){ |
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74 75 76 77 78 79 80 | } } /* Resolve the field names and do a semantics check on all the expressions. */ for(i=0; i<pEList->nExpr; i++){ if( sqliteExprResolveIds(pParse, pTabList, pEList->a[i].pExpr) ){ | | | | | | | | < | > > > > | 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | } } /* Resolve the field names and do a semantics check on all the expressions. */ for(i=0; i<pEList->nExpr; i++){ if( sqliteExprResolveIds(pParse, pTabList, pEList->a[i].pExpr) ){ return 1; } if( sqliteExprCheck(pParse, pEList->a[i].pExpr, 1, &pEList->a[i].isAgg) ){ return 1; } } if( pEList->nExpr>0 ){ isAgg = pEList->a[0].isAgg; for(i=1; i<pEList->nExpr; i++){ if( pEList->a[i].isAgg!=isAgg ){ sqliteSetString(&pParse->zErrMsg, "some selected items are aggregates " "and others are not", 0); pParse->nErr++; return 1; } } } if( pWhere ){ if( sqliteExprResolveIds(pParse, pTabList, pWhere) ){ return 1; } if( sqliteExprCheck(pParse, pWhere, 0, 0) ){ return 1; } } if( pOrderBy ){ for(i=0; i<pOrderBy->nExpr; i++){ if( sqliteExprResolveIds(pParse, pTabList, pOrderBy->a[i].pExpr) ){ return 1; } if( sqliteExprCheck(pParse, pOrderBy->a[i].pExpr, 0, 0) ){ return 1; } } } /* ORDER BY is ignored if this is an aggregate query like count(*) ** since only one row will be returned. */ if( isAgg && pOrderBy ){ pOrderBy = 0; } /* Turn off distinct if this is an aggregate */ if( isAgg ){ distinct = 0; } /* Begin generating code. */ v = pParse->pVdbe; if( v==0 ){ v = pParse->pVdbe = sqliteVdbeCreate(pParse->db->pBe); } if( v==0 ){ sqliteSetString(&pParse->zErrMsg, "out of memory", 0); pParse->nErr++; return 1; } if( pOrderBy ){ sqliteVdbeAddOp(v, OP_SortOpen, 0, 0, 0, 0); } /* Identify column names */ sqliteVdbeAddOp(v, OP_ColumnCount, pEList->nExpr, 0, 0, 0); |
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197 198 199 200 201 202 203 | /* Begin the database scan */ if( distinct ){ distinct = pTabList->nId*2+1; sqliteVdbeAddOp(v, OP_Open, distinct, 1, 0, 0); } pWInfo = sqliteWhereBegin(pParse, pTabList, pWhere, 0); | | | 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 | /* Begin the database scan */ if( distinct ){ distinct = pTabList->nId*2+1; sqliteVdbeAddOp(v, OP_Open, distinct, 1, 0, 0); } pWInfo = sqliteWhereBegin(pParse, pTabList, pWhere, 0); if( pWInfo==0 ) return 1; /* Pull the requested fields. */ if( !isAgg ){ for(i=0; i<pEList->nExpr; i++){ sqliteExprCode(pParse, pEList->a[i].pExpr); } |
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228 229 230 231 232 233 234 | ** right away. If there is an ORDER BY, then we need to put the ** data into an appropriate sorter record. */ if( pOrderBy ){ char *zSortOrder; sqliteVdbeAddOp(v, OP_SortMakeRec, pEList->nExpr, 0, 0, 0); zSortOrder = sqliteMalloc( pOrderBy->nExpr + 1 ); | | | 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 | ** right away. If there is an ORDER BY, then we need to put the ** data into an appropriate sorter record. */ if( pOrderBy ){ char *zSortOrder; sqliteVdbeAddOp(v, OP_SortMakeRec, pEList->nExpr, 0, 0, 0); zSortOrder = sqliteMalloc( pOrderBy->nExpr + 1 ); if( zSortOrder==0 ) return 1; for(i=0; i<pOrderBy->nExpr; i++){ zSortOrder[i] = pOrderBy->a[i].idx ? '-' : '+'; sqliteExprCode(pParse, pOrderBy->a[i].pExpr); } zSortOrder[pOrderBy->nExpr] = 0; sqliteVdbeAddOp(v, OP_SortMakeKey, pOrderBy->nExpr, 0, zSortOrder, 0); sqliteVdbeAddOp(v, OP_SortPut, 0, 0, 0, 0); |
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284 285 286 287 288 289 290 | /* If this is an aggregate, then we need to invoke the callback ** exactly once. */ if( isAgg ){ sqliteVdbeAddOp(v, OP_Callback, pEList->nExpr, 0, 0, 0); } | < < < < < < < < < | | 353 354 355 356 357 358 359 360 361 | /* If this is an aggregate, then we need to invoke the callback ** exactly once. */ if( isAgg ){ sqliteVdbeAddOp(v, OP_Callback, pEList->nExpr, 0, 0, 0); } return 0; } |
Changes to src/sqliteInt.h.
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19 20 21 22 23 24 25 | ** Author contact information: ** drh@hwaci.com ** http://www.hwaci.com/drh/ ** ************************************************************************* ** Internal interface definitions for SQLite. ** | | | | 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | ** Author contact information: ** drh@hwaci.com ** http://www.hwaci.com/drh/ ** ************************************************************************* ** Internal interface definitions for SQLite. ** ** @(#) $Id: sqliteInt.h,v 1.14 2000/06/05 16:01:39 drh Exp $ */ #include "sqlite.h" #include "dbbe.h" #include "vdbe.h" #include "parse.h" #include <gdbm.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #define MEMORY_DEBUG 1 #ifdef MEMORY_DEBUG # define sqliteMalloc(X) sqliteMalloc_(X,__FILE__,__LINE__) # define sqliteFree(X) sqliteFree_(X,__FILE__,__LINE__) # define sqliteRealloc(X,Y) sqliteRealloc_(X,Y,__FILE__,__LINE__) void sqliteStrRealloc(char**); #else # define sqliteStrRealloc(X) |
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83 84 85 86 87 88 89 90 91 92 93 94 95 96 | typedef struct Instruction Instruction; typedef struct Expr Expr; typedef struct ExprList ExprList; typedef struct Parse Parse; typedef struct Token Token; typedef struct IdList IdList; typedef struct WhereInfo WhereInfo; /* ** Each database is an instance of the following structure */ struct sqlite { Dbbe *pBe; /* The backend driver */ int flags; /* Miscellanous flags */ | > | 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | typedef struct Instruction Instruction; typedef struct Expr Expr; typedef struct ExprList ExprList; typedef struct Parse Parse; typedef struct Token Token; typedef struct IdList IdList; typedef struct WhereInfo WhereInfo; typedef struct Select Select; /* ** Each database is an instance of the following structure */ struct sqlite { Dbbe *pBe; /* The backend driver */ int flags; /* Miscellanous flags */ |
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204 205 206 207 208 209 210 211 212 213 214 215 216 217 | struct WhereInfo { Parse *pParse; IdList *pTabList; int iContinue; int iBreak; }; /* ** An SQL parser context */ struct Parse { sqlite *db; /* The main database structure */ sqlite_callback xCallback; /* The callback function */ void *pArg; /* First argument to the callback function */ | > > > > > > > > > > > > > > | 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | struct WhereInfo { Parse *pParse; IdList *pTabList; int iContinue; int iBreak; }; /* ** An instance of the following structure contains all information ** needed to generate code for a single SELECT statement. */ struct Select { int isDistinct; /* True if the DISTINCT keyword is present */ ExprList *pEList; /* The fields of the result */ IdList *pSrc; /* The FROM clause */ Expr *pWhere; /* The WHERE clause */ ExprList *pGroupBy; /* The GROUP BY clause */ Expr *pHaving; /* The HAVING clause */ ExprList *pOrderBy; /* The ORDER BY clause */ }; /* ** An SQL parser context */ struct Parse { sqlite *db; /* The main database structure */ sqlite_callback xCallback; /* The callback function */ void *pArg; /* First argument to the callback function */ |
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262 263 264 265 266 267 268 | void sqliteDeleteTable(sqlite*, Table*); void sqliteInsert(Parse*, Token*, ExprList*, IdList*); IdList *sqliteIdListAppend(IdList*, Token*); void sqliteIdListAddAlias(IdList*, Token*); void sqliteIdListDelete(IdList*); void sqliteCreateIndex(Parse*, Token*, Token*, IdList*, Token*, Token*); void sqliteDropIndex(Parse*, Token*); | > > | | 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 | void sqliteDeleteTable(sqlite*, Table*); void sqliteInsert(Parse*, Token*, ExprList*, IdList*); IdList *sqliteIdListAppend(IdList*, Token*); void sqliteIdListAddAlias(IdList*, Token*); void sqliteIdListDelete(IdList*); void sqliteCreateIndex(Parse*, Token*, Token*, IdList*, Token*, Token*); void sqliteDropIndex(Parse*, Token*); int sqliteSelect(Parse*, Select*, Table*, int); Select *sqliteSelectNew(ExprList*,IdList*,Expr*,ExprList*,Expr*,ExprList*,int); void sqliteSelectDelete(Select*); void sqliteDeleteFrom(Parse*, Token*, Expr*); void sqliteUpdate(Parse*, Token*, ExprList*, Expr*); WhereInfo *sqliteWhereBegin(Parse*, IdList*, Expr*, int); void sqliteWhereEnd(WhereInfo*); void sqliteExprCode(Parse*, Expr*); void sqliteExprIfTrue(Parse*, Expr*, int); void sqliteExprIfFalse(Parse*, Expr*, int); |
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Changes to src/util.c.
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22 23 24 25 26 27 28 | ** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** | | | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | ** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** ** $Id: util.c,v 1.11 2000/06/05 16:01:39 drh Exp $ */ #include "sqliteInt.h" #include <stdarg.h> #include <ctype.h> #ifdef MEMORY_DEBUG |
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98 99 100 101 102 103 104 | sqliteFree_(oldP,zFile,line); return 0; } oldPi = oldP; oldPi -= 2; if( oldPi[0]!=0xdead1122 ){ fprintf(stderr,"Low-end memory corruption in realloc at 0x%x\n", (int)p); | | | | 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | sqliteFree_(oldP,zFile,line); return 0; } oldPi = oldP; oldPi -= 2; if( oldPi[0]!=0xdead1122 ){ fprintf(stderr,"Low-end memory corruption in realloc at 0x%x\n", (int)p); return 0; } oldN = oldPi[1]; oldK = (oldN+sizeof(int)-1)/sizeof(int); if( oldPi[oldK+2]!=0xdead3344 ){ fprintf(stderr,"High-end memory corruption in realloc at 0x%x\n", (int)p); return 0; } k = (n + sizeof(int) - 1)/sizeof(int); pi = malloc( (k+3)*sizeof(int) ); pi[0] = 0xdead1122; pi[1] = n; pi[k+2] = 0xdead3344; p = &pi[2]; |
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Changes to src/vdbe.c.
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37 38 39 40 41 42 43 | ** inplicit conversion from one type to the other occurs as necessary. ** ** Most of the code in this file is taken up by the sqliteVdbeExec() ** function which does the work of interpreting a VDBE program. ** But other routines are also provided to help in building up ** a program instruction by instruction. ** | | > | 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | ** inplicit conversion from one type to the other occurs as necessary. ** ** Most of the code in this file is taken up by the sqliteVdbeExec() ** function which does the work of interpreting a VDBE program. ** But other routines are also provided to help in building up ** a program instruction by instruction. ** ** $Id: vdbe.c,v 1.15 2000/06/05 16:01:39 drh Exp $ */ #include "sqliteInt.h" #include <unistd.h> /* ** SQL is translated into a sequence of instructions to be ** executed by a virtual machine. Each instruction is an instance ** of the following structure. */ typedef struct VdbeOp Op; |
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737 738 739 740 741 742 743 | /* Opcode: NULL * * * ** ** Push a NULL value onto the stack. */ case OP_Null: { int i = ++p->tos; | < | 738 739 740 741 742 743 744 745 746 747 748 749 750 751 | /* Opcode: NULL * * * ** ** Push a NULL value onto the stack. */ case OP_Null: { int i = ++p->tos; if( NeedStack(p, p->tos) ) goto no_mem; p->zStack[i] = 0; p->aStack[i].flags = STK_Null; break; } /* Opcode: Pop P1 * * |
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