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initial check-in of the new version (CVS 1)

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drh
2000-05-29 14:26:00 +00:00
parent ce0da46e61
commit 75897234be
25 changed files with 15075 additions and 8 deletions
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/*
** Copyright (c) 1999, 2000 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.1 2000/05/29 14:26:01 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>
/*
** The number of entries in the in-memory hash table holding the
** schema.
*/
#define N_HASH 51
/*
** Name of the master database table. The master database table
** is a special table that holds the names and attributes of all
** user tables and indices.
*/
#define MASTER_NAME "sqlite_master"
/*
** A convenience macro that returns the number of elements in
** an array.
*/
#define ArraySize(X) (sizeof(X)/sizeof(X[0]))
/*
** Forward references to structures
*/
typedef struct Table Table;
typedef struct Index Index;
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 */
Table *apTblHash[N_HASH]; /* All tables of the database */
Index *apIdxHash[N_HASH]; /* All indices of the database */
};
/*
** Possible values for the flags field of sqlite
*/
#define SQLITE_VdbeTrace 0x00000001
/*
** Each table is represented in memory by
** an instance of the following structure
*/
struct Table {
char *zName; /* Name of the table */
Table *pHash; /* Next table with same hash on zName */
int nCol; /* Number of columns in this table */
int readOnly; /* True if this table should not be written by the user */
char **azCol; /* Name of each column */
Index *pIndex; /* List of indices on this table. */
};
/*
** Each index is represented in memory by and
** instance of the following structure.
*/
struct Index {
char *zName; /* Name of this index */
Index *pHash; /* Next index with the same hash on zName */
int nField; /* Number of fields in the table indexed by this index */
int *aiField; /* Indices of fields used by this index. 1st is 0 */
Table *pTable; /* The table being indexed */
Index *pNext; /* The next index associated with the same table */
};
/*
** Each token coming out of the lexer is an instance of
** this structure.
*/
struct Token {
char *z; /* Text of the token */
int n; /* Number of characters in this token */
};
/*
** Each node of an expression in the parse tree is an instance
** of this structure
*/
struct Expr {
int op; /* Operation performed by this node */
Expr *pLeft, *pRight; /* Left and right subnodes */
ExprList *pList; /* A list of expressions used as a function argument */
Token token; /* An operand token */
int iTable, iField; /* When op==TK_FIELD, then this node means the
** iField-th field of the iTable-th table */
};
/*
** A list of expressions. Each expression may optionally have a
** name. An expr/name combination can be used in several ways, such
** as the list of "expr AS ID" fields following a "SELECT" or in the
** list of "ID = expr" items in an UPDATE. A list of expressions can
** also be used as the argument to a function, in which case the azName
** field is not used.
*/
struct ExprList {
int nExpr; /* Number of expressions on the list */
struct {
Expr *pExpr; /* The list of expressions */
char *zName; /* Token associated with this expression */
int idx; /* ... */
} *a; /* One entry for each expression */
};
/*
** A list of identifiers.
*/
struct IdList {
int nId; /* Number of identifiers on the list */
struct {
char *zName; /* Text of the identifier. */
char *zAlias; /* The "B" part of a "A AS B" phrase. zName is the "A" */
Table *pTab; /* Table corresponding to zName */
int idx; /* Index of a field name in the table */
} *a; /* One entry for each identifier on the list */
};
/*
** The WHERE clause processing routine has two halves. The
** first part does the start of the WHERE loop and the second
** half does the tail of the WHERE loop. An instance of
** this structure is returned by the first half and passed
** into the second half to give some continuity.
*/
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 */
char *zErrMsg; /* An error message */
Token sErrToken; /* The token at which the error occurred */
Token sFirstToken; /* The first token parsed */
Token sLastToken; /* The last token parsed */
Table *pNewTable; /* A table being constructed by CREATE TABLE */
Vdbe *pVdbe; /* An engine for executing database bytecode */
int explain; /* True if the EXPLAIN flag is found on the query */
int initFlag; /* True if reparsing CREATE TABLEs */
int nErr; /* Number of errors seen */
};
/*
** Internal function prototypes
*/
int sqliteStrICmp(const char *, const char *);
int sqliteStrNICmp(const char *, const char *, int);
int sqliteHashNoCase(const char *, int);
int sqliteCompare(const char *, const char *);
int sqliteSortCompare(const char *, const char *);
void *sqliteMalloc(int);
void sqliteFree(void*);
void *sqliteRealloc(void*,int);
int sqliteGetToken(const char*, int *);
void sqliteSetString(char **, const char *, ...);
void sqliteSetNString(char **, ...);
int sqliteRunParser(Parse*, char*, char **);
void sqliteExec(Parse*);
Expr *sqliteExpr(int, Expr*, Expr*, Token*);
Expr *sqliteExprFunction(ExprList*, Token*);
void sqliteExprDelete(Expr*);
ExprList *sqliteExprListAppend(ExprList*,Expr*,Token*);
void sqliteExprListDelete(ExprList*);
void sqliteStartTable(Parse*,Token*,Token*);
void sqliteAddColumn(Parse*,Token*);
void sqliteEndTable(Parse*,Token*);
void sqliteDropTable(Parse*, Token*);
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*);
void sqliteSelect(Parse*, ExprList*, IdList*, Expr*, ExprList*);
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);
Table *sqliteFindTable(sqlite*,char*);