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Overview
Comment:Omit the LikeOp object from the parser. Change more sqlite3PExpr() calls into sqlite3ExprAlloc() calls.
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SHA1: 795454a3fa5f9ccc486593b5e16e8fad38c934fb
User & Date: drh 2016-09-24 17:42:43
Context
2016-09-26
12:38
Inline the relevent parts of sqlite3ExprAlloc() into spanExpr(), for a performance improvement. check-in: fe89225e user: drh tags: trunk
2016-09-24
17:42
Omit the LikeOp object from the parser. Change more sqlite3PExpr() calls into sqlite3ExprAlloc() calls. check-in: 795454a3 user: drh tags: trunk
01:41
Add -DSQLITE_MAX_EXPR_DEPTH=0 to the --lean option on speed-check.sh. check-in: a8cb1390 user: drh tags: trunk
Changes
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Changes to src/parse.y.

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** LIMIT clause of a SELECT statement.
*/
struct LimitVal {
  Expr *pLimit;    /* The LIMIT expression.  NULL if there is no limit */
  Expr *pOffset;   /* The OFFSET expression.  NULL if there is none */
};

/*
** An instance of this structure is used to store the LIKE,
** GLOB, NOT LIKE, and NOT GLOB operators.
*/
struct LikeOp {
  Token eOperator;  /* "like" or "glob" or "regexp" */
  int bNot;         /* True if the NOT keyword is present */
};

/*
** An instance of the following structure describes the event of a
** TRIGGER.  "a" is the event type, one of TK_UPDATE, TK_INSERT,
** TK_DELETE, or TK_INSTEAD.  If the event is of the form
**
**      UPDATE ON (a,b,c)
**
** Then the "b" IdList records the list "a,b,c".
*/
struct TrigEvent { int a; IdList * b; };

/*
** An instance of this structure holds the ATTACH key and the key type.
*/
struct AttachKey { int type;  Token key; };

/*
** Disable lookaside memory allocation for objects that might be
** shared across database connections.
*/
static void disableLookaside(Parse *pParse){
  pParse->disableLookaside++;
  pParse->db->lookaside.bDisable++;
................................................................................
expr(A) ::= term(A).
expr(A) ::= LP(B) expr(X) RP(E).
            {spanSet(&A,&B,&E); /*A-overwrites-B*/  A.pExpr = X.pExpr;}
term(A) ::= NULL(X).        {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= id(X).          {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= JOIN_KW(X).     {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= nm(X) DOT nm(Y). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);
  spanSet(&A,&X,&Y); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2, 0);
}
expr(A) ::= nm(X) DOT nm(Y) DOT nm(Z). {
  Expr *temp1 = sqlite3PExpr(pParse, TK_ID, 0, 0, &X);
  Expr *temp2 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Y);
  Expr *temp3 = sqlite3PExpr(pParse, TK_ID, 0, 0, &Z);
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&A,&X,&Z); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
}
term(A) ::= INTEGER|FLOAT|BLOB(X). {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
term(A) ::= STRING(X).             {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= VARIABLE(X).     {
................................................................................
expr(A) ::= expr(A) BITAND|BITOR|LSHIFT|RSHIFT(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) CONCAT(OP) expr(Y). {spanBinaryExpr(pParse,@OP,&A,&Y);}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 0;/*A-overwrites-X*/}
likeop(A) ::= NOT LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 1;}
expr(A) ::= expr(A) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;


  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A);
  A.zEnd = Y.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}
expr(A) ::= expr(A) likeop(OP) expr(Y) ESCAPE expr(E).  [LIKE_KW]  {
  ExprList *pList;


  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, E.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  exprNot(pParse, OP.bNot, &A);
  A.zEnd = E.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}

%include {
  /* Construct an expression node for a unary postfix operator
  */







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** LIMIT clause of a SELECT statement.
*/
struct LimitVal {
  Expr *pLimit;    /* The LIMIT expression.  NULL if there is no limit */
  Expr *pOffset;   /* The OFFSET expression.  NULL if there is none */
};










/*
** An instance of the following structure describes the event of a
** TRIGGER.  "a" is the event type, one of TK_UPDATE, TK_INSERT,
** TK_DELETE, or TK_INSTEAD.  If the event is of the form
**
**      UPDATE ON (a,b,c)
**
** Then the "b" IdList records the list "a,b,c".
*/
struct TrigEvent { int a; IdList * b; };






/*
** Disable lookaside memory allocation for objects that might be
** shared across database connections.
*/
static void disableLookaside(Parse *pParse){
  pParse->disableLookaside++;
  pParse->db->lookaside.bDisable++;
................................................................................
expr(A) ::= term(A).
expr(A) ::= LP(B) expr(X) RP(E).
            {spanSet(&A,&B,&E); /*A-overwrites-B*/  A.pExpr = X.pExpr;}
term(A) ::= NULL(X).        {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= id(X).          {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= JOIN_KW(X).     {spanExpr(&A,pParse,TK_ID,X); /*A-overwrites-X*/}
expr(A) ::= nm(X) DOT nm(Y). {
  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &X, 1);
  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &Y, 1);
  spanSet(&A,&X,&Y); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2, 0);
}
expr(A) ::= nm(X) DOT nm(Y) DOT nm(Z). {
  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &X, 1);
  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &Y, 1);
  Expr *temp3 = sqlite3ExprAlloc(pParse->db, TK_ID, &Z, 1);
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&A,&X,&Z); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
}
term(A) ::= INTEGER|FLOAT|BLOB(X). {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
term(A) ::= STRING(X).             {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= VARIABLE(X).     {
................................................................................
expr(A) ::= expr(A) BITAND|BITOR|LSHIFT|RSHIFT(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(pParse,@OP,&A,&Y);}
expr(A) ::= expr(A) CONCAT(OP) expr(Y). {spanBinaryExpr(pParse,@OP,&A,&Y);}
%type likeop {Token}
likeop(A) ::= LIKE_KW|MATCH(X).     {A=X;/*A-overwrites-X*/}
likeop(A) ::= NOT LIKE_KW|MATCH(X). {A=X; A.n|=0x80000000; /*A-overwrite-X*/}
expr(A) ::= expr(A) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;
  int bNot = OP.n & 0x80000000;
  OP.n &= 0x7fffffff;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP);
  exprNot(pParse, bNot, &A);
  A.zEnd = Y.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}
expr(A) ::= expr(A) likeop(OP) expr(Y) ESCAPE expr(E).  [LIKE_KW]  {
  ExprList *pList;
  int bNot = OP.n & 0x80000000;
  OP.n &= 0x7fffffff;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, A.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, E.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP);
  exprNot(pParse, bNot, &A);
  A.zEnd = E.zEnd;
  if( A.pExpr ) A.pExpr->flags |= EP_InfixFunc;
}

%include {
  /* Construct an expression node for a unary postfix operator
  */