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expr_c.cs
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executable file
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#define SQLITE_MAX_EXPR_DEPTH
using System;
using System.Diagnostics;
using System.Text;
using Bitmask = System.UInt64;
using i64 = System.Int64;
using u8 = System.Byte;
using u32 = System.UInt32;
using u16 = System.UInt16;
using Pgno = System.UInt32;
#if !SQLITE_MAX_VARIABLE_NUMBER
using ynVar = System.Int16;
#else
using ynVar = System.Int32;
#endif
namespace System.Data.SQLite
{
public partial class Sqlite3
{
/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
*************************************************************************
** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
** C#-SQLite is an independent reimplementation of the SQLite software library
**
** SQLITE_SOURCE_ID: 2011-06-23 19:49:22 4374b7e83ea0a3fbc3691f9c0c936272862f32f2
**
*************************************************************************
*/
//#include "sqliteInt.h"
/*
** Return the 'affinity' of the expression pExpr if any.
**
** If pExpr is a column, a reference to a column via an 'AS' alias,
** or a sub-select with a column as the return value, then the
** affinity of that column is returned. Otherwise, 0x00 is returned,
** indicating no affinity for the expression.
**
** i.e. the WHERE clause expresssions in the following statements all
** have an affinity:
**
** CREATE TABLE t1(a);
** SELECT * FROM t1 WHERE a;
** SELECT a AS b FROM t1 WHERE b;
** SELECT * FROM t1 WHERE (select a from t1);
*/
static char sqlite3ExprAffinity(Expr pExpr)
{
int op = pExpr.op;
if (op == TK_SELECT)
{
Debug.Assert((pExpr.flags & EP_xIsSelect) != 0);
return sqlite3ExprAffinity(pExpr.x.pSelect.pEList.a[0].pExpr);
}
#if !SQLITE_OMIT_CAST
if (op == TK_CAST)
{
Debug.Assert(!ExprHasProperty(pExpr, EP_IntValue));
return sqlite3AffinityType(pExpr.u.zToken);
}
#endif
if ((op == TK_AGG_COLUMN || op == TK_COLUMN || op == TK_REGISTER)
&& pExpr.pTab != null
)
{
/* op==TK_REGISTER && pExpr.pTab!=0 happens when pExpr was originally
** a TK_COLUMN but was previously evaluated and cached in a register */
int j = pExpr.iColumn;
if (j < 0)
return SQLITE_AFF_INTEGER;
Debug.Assert(pExpr.pTab != null && j < pExpr.pTab.nCol);
return pExpr.pTab.aCol[j].affinity;
}
return pExpr.affinity;
}
/*
** Set the explicit collating sequence for an expression to the
** collating sequence supplied in the second argument.
*/
static Expr sqlite3ExprSetColl(Expr pExpr, CollSeq pColl)
{
if (pExpr != null && pColl != null)
{
pExpr.pColl = pColl;
pExpr.flags |= EP_ExpCollate;
}
return pExpr;
}
/*
** Set the collating sequence for expression pExpr to be the collating
** sequence named by pToken. Return a pointer to the revised expression.
** The collating sequence is marked as "explicit" using the EP_ExpCollate
** flag. An explicit collating sequence will override implicit
** collating sequences.
*/
static Expr sqlite3ExprSetCollByToken(Parse pParse, Expr pExpr, Token pCollName)
{
string zColl; /* Dequoted name of collation sequence */
CollSeq pColl;
sqlite3 db = pParse.db;
zColl = sqlite3NameFromToken(db, pCollName);
pColl = sqlite3LocateCollSeq(pParse, zColl);
sqlite3ExprSetColl(pExpr, pColl);
sqlite3DbFree(db, ref zColl);
return pExpr;
}
/*
** Return the default collation sequence for the expression pExpr. If
** there is no default collation type, return 0.
*/
static CollSeq sqlite3ExprCollSeq(Parse pParse, Expr pExpr)
{
CollSeq pColl = null;
Expr p = pExpr;
while (ALWAYS(p))
{
int op;
pColl = pExpr.pColl;
if (pColl != null)
break;
op = p.op;
if (p.pTab != null && (
op == TK_AGG_COLUMN || op == TK_COLUMN || op == TK_REGISTER || op == TK_TRIGGER
))
{
/* op==TK_REGISTER && p->pTab!=0 happens when pExpr was originally
** a TK_COLUMN but was previously evaluated and cached in a register */
string zColl;
int j = p.iColumn;
if (j >= 0)
{
sqlite3 db = pParse.db;
zColl = p.pTab.aCol[j].zColl;
pColl = sqlite3FindCollSeq(db, ENC(db), zColl, 0);
pExpr.pColl = pColl;
}
break;
}
if (op != TK_CAST && op != TK_UPLUS)
{
break;
}
p = p.pLeft;
}
if (sqlite3CheckCollSeq(pParse, pColl) != 0)
{
pColl = null;
}
return pColl;
}
/*
** pExpr is an operand of a comparison operator. aff2 is the
** type affinity of the other operand. This routine returns the
** type affinity that should be used for the comparison operator.
*/
static char sqlite3CompareAffinity(Expr pExpr, char aff2)
{
char aff1 = sqlite3ExprAffinity(pExpr);
if (aff1 != '\0' && aff2 != '\0')
{
/* Both sides of the comparison are columns. If one has numeric
** affinity, use that. Otherwise use no affinity.
*/
if (aff1 >= SQLITE_AFF_NUMERIC || aff2 >= SQLITE_AFF_NUMERIC)
// if (sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2))
{
return SQLITE_AFF_NUMERIC;
}
else
{
return SQLITE_AFF_NONE;
}
}
else if (aff1 == '\0' && aff2 == '\0')
{
/* Neither side of the comparison is a column. Compare the
** results directly.
*/
return SQLITE_AFF_NONE;
}
else
{
/* One side is a column, the other is not. Use the columns affinity. */
Debug.Assert(aff1 == 0 || aff2 == 0);
return (aff1 != '\0' ? aff1 : aff2);
}
}
/*
** pExpr is a comparison operator. Return the type affinity that should
** be applied to both operands prior to doing the comparison.
*/
static char comparisonAffinity(Expr pExpr)
{
char aff;
Debug.Assert(pExpr.op == TK_EQ || pExpr.op == TK_IN || pExpr.op == TK_LT ||
pExpr.op == TK_GT || pExpr.op == TK_GE || pExpr.op == TK_LE ||
pExpr.op == TK_NE || pExpr.op == TK_IS || pExpr.op == TK_ISNOT);
Debug.Assert(pExpr.pLeft != null);
aff = sqlite3ExprAffinity(pExpr.pLeft);
if (pExpr.pRight != null)
{
aff = sqlite3CompareAffinity(pExpr.pRight, aff);
}
else if (ExprHasProperty(pExpr, EP_xIsSelect))
{
aff = sqlite3CompareAffinity(pExpr.x.pSelect.pEList.a[0].pExpr, aff);
}
else if (aff == '\0')
{
aff = SQLITE_AFF_NONE;
}
return aff;
}
/*
** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
** idx_affinity is the affinity of an indexed column. Return true
** if the index with affinity idx_affinity may be used to implement
** the comparison in pExpr.
*/
static bool sqlite3IndexAffinityOk(Expr pExpr, char idx_affinity)
{
char aff = comparisonAffinity(pExpr);
switch (aff)
{
case SQLITE_AFF_NONE:
return true;
case SQLITE_AFF_TEXT:
return idx_affinity == SQLITE_AFF_TEXT;
default:
return idx_affinity >= SQLITE_AFF_NUMERIC;// sqlite3IsNumericAffinity(idx_affinity);
}
}
/*
** Return the P5 value that should be used for a binary comparison
** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
*/
static u8 binaryCompareP5(Expr pExpr1, Expr pExpr2, int jumpIfNull)
{
u8 aff = (u8)sqlite3ExprAffinity(pExpr2);
aff = (u8)((u8)sqlite3CompareAffinity(pExpr1, (char)aff) | (u8)jumpIfNull);
return aff;
}
/*
** Return a pointer to the collation sequence that should be used by
** a binary comparison operator comparing pLeft and pRight.
**
** If the left hand expression has a collating sequence type, then it is
** used. Otherwise the collation sequence for the right hand expression
** is used, or the default (BINARY) if neither expression has a collating
** type.
**
** Argument pRight (but not pLeft) may be a null pointer. In this case,
** it is not considered.
*/
static CollSeq sqlite3BinaryCompareCollSeq(
Parse pParse,
Expr pLeft,
Expr pRight
)
{
CollSeq pColl;
Debug.Assert(pLeft != null);
if ((pLeft.flags & EP_ExpCollate) != 0)
{
Debug.Assert(pLeft.pColl != null);
pColl = pLeft.pColl;
}
else if (pRight != null && ((pRight.flags & EP_ExpCollate) != 0))
{
Debug.Assert(pRight.pColl != null);
pColl = pRight.pColl;
}
else
{
pColl = sqlite3ExprCollSeq(pParse, pLeft);
if (pColl == null)
{
pColl = sqlite3ExprCollSeq(pParse, pRight);
}
}
return pColl;
}
/*
** Generate code for a comparison operator.
*/
static int codeCompare(
Parse pParse, /* The parsing (and code generating) context */
Expr pLeft, /* The left operand */
Expr pRight, /* The right operand */
int opcode, /* The comparison opcode */
int in1, int in2, /* Register holding operands */
int dest, /* Jump here if true. */
int jumpIfNull /* If true, jump if either operand is NULL */
)
{
int p5;
int addr;
CollSeq p4;
p4 = sqlite3BinaryCompareCollSeq(pParse, pLeft, pRight);
p5 = binaryCompareP5(pLeft, pRight, jumpIfNull);
addr = sqlite3VdbeAddOp4(pParse.pVdbe, opcode, in2, dest, in1,
p4, P4_COLLSEQ);
sqlite3VdbeChangeP5(pParse.pVdbe, (u8)p5);
return addr;
}
#if SQLITE_MAX_EXPR_DEPTH //>0
/*
** Check that argument nHeight is less than or equal to the maximum
** expression depth allowed. If it is not, leave an error message in
** pParse.
*/
static int sqlite3ExprCheckHeight(Parse pParse, int nHeight)
{
int rc = SQLITE_OK;
int mxHeight = pParse.db.aLimit[SQLITE_LIMIT_EXPR_DEPTH];
if (nHeight > mxHeight)
{
sqlite3ErrorMsg(pParse,
"Expression tree is too large (maximum depth %d)", mxHeight
);
rc = SQLITE_ERROR;
}
return rc;
}
/* The following three functions, heightOfExpr(), heightOfExprList()
** and heightOfSelect(), are used to determine the maximum height
** of any expression tree referenced by the structure passed as the
** first argument.
**
** If this maximum height is greater than the current value pointed
** to by pnHeight, the second parameter, then set pnHeight to that
** value.
*/
static void heightOfExpr(Expr p, ref int pnHeight)
{
if (p != null)
{
if (p.nHeight > pnHeight)
{
pnHeight = p.nHeight;
}
}
}
static void heightOfExprList(ExprList p, ref int pnHeight)
{
if (p != null)
{
int i;
for (i = 0; i < p.nExpr; i++)
{
heightOfExpr(p.a[i].pExpr, ref pnHeight);
}
}
}
static void heightOfSelect(Select p, ref int pnHeight)
{
if (p != null)
{
heightOfExpr(p.pWhere, ref pnHeight);
heightOfExpr(p.pHaving, ref pnHeight);
heightOfExpr(p.pLimit, ref pnHeight);
heightOfExpr(p.pOffset, ref pnHeight);
heightOfExprList(p.pEList, ref pnHeight);
heightOfExprList(p.pGroupBy, ref pnHeight);
heightOfExprList(p.pOrderBy, ref pnHeight);
heightOfSelect(p.pPrior, ref pnHeight);
}
}
/*
** Set the Expr.nHeight variable in the structure passed as an
** argument. An expression with no children, Expr.x.pList or
** Expr.x.pSelect member has a height of 1. Any other expression
** has a height equal to the maximum height of any other
** referenced Expr plus one.
*/
static void exprSetHeight(Expr p)
{
int nHeight = 0;
heightOfExpr(p.pLeft, ref nHeight);
heightOfExpr(p.pRight, ref nHeight);
if (ExprHasProperty(p, EP_xIsSelect))
{
heightOfSelect(p.x.pSelect, ref nHeight);
}
else
{
heightOfExprList(p.x.pList, ref nHeight);
}
p.nHeight = nHeight + 1;
}
/*
** Set the Expr.nHeight variable using the exprSetHeight() function. If
** the height is greater than the maximum allowed expression depth,
** leave an error in pParse.
*/
static void sqlite3ExprSetHeight(Parse pParse, Expr p)
{
exprSetHeight(p);
sqlite3ExprCheckHeight(pParse, p.nHeight);
}
/*
** Return the maximum height of any expression tree referenced
** by the select statement passed as an argument.
*/
static int sqlite3SelectExprHeight(Select p)
{
int nHeight = 0;
heightOfSelect(p, ref nHeight);
return nHeight;
}
#else
//#define exprSetHeight(y)
#endif //* SQLITE_MAX_EXPR_DEPTH>0 */
/*
** This routine is the core allocator for Expr nodes.
**
** Construct a new expression node and return a pointer to it. Memory
** for this node and for the pToken argument is a single allocation
** obtained from sqlite3DbMalloc(). The calling function
** is responsible for making sure the node eventually gets freed.
**
** If dequote is true, then the token (if it exists) is dequoted.
** If dequote is false, no dequoting is performance. The deQuote
** parameter is ignored if pToken is NULL or if the token does not
** appear to be quoted. If the quotes were of the form "..." (double-quotes)
** then the EP_DblQuoted flag is set on the expression node.
**
** Special case: If op==TK_INTEGER and pToken points to a string that
** can be translated into a 32-bit integer, then the token is not
** stored in u.zToken. Instead, the integer values is written
** into u.iValue and the EP_IntValue flag is set. No extra storage
** is allocated to hold the integer text and the dequote flag is ignored.
*/
static Expr sqlite3ExprAlloc(
sqlite3 db, /* Handle for sqlite3DbMallocZero() (may be null) */
int op, /* Expression opcode */
Token pToken, /* Token argument. Might be NULL */
int dequote /* True to dequote */
)
{
Expr pNew;
int nExtra = 0;
int iValue = 0;
if (pToken != null)
{
if (op != TK_INTEGER || pToken.z == null || pToken.z.Length == 0
|| sqlite3GetInt32(pToken.z.ToString(), ref iValue) == false)
{
nExtra = pToken.n + 1;
Debug.Assert(iValue >= 0);
}
}
pNew = new Expr();//sqlite3DbMallocZero(db, sizeof(Expr)+nExtra);
if (pNew != null)
{
pNew.op = (u8)op;
pNew.iAgg = -1;
if (pToken != null)
{
if (nExtra == 0)
{
pNew.flags |= EP_IntValue;
pNew.u.iValue = iValue;
}
else
{
int c;
//pNew.u.zToken = (char)&pNew[1];
if (pToken.n > 0)
pNew.u.zToken = pToken.z.Substring(0, pToken.n);//memcpy(pNew.u.zToken, pToken.z, pToken.n);
else if (pToken.n == 0 && pToken.z == "")
pNew.u.zToken = "";
//pNew.u.zToken[pToken.n] = 0;
if (dequote != 0 && nExtra >= 3
&& ((c = pToken.z[0]) == '\'' || c == '"' || c == '[' || c == '`'))
{
#if DEBUG_CLASS_EXPR || DEBUG_CLASS_ALL
sqlite3Dequote(ref pNew.u._zToken);
#else
sqlite3Dequote(ref pNew.u.zToken);
#endif
if (c == '"')
pNew.flags |= EP_DblQuoted;
}
}
}
#if SQLITE_MAX_EXPR_DEPTH//>0
pNew.nHeight = 1;
#endif
}
return pNew;
}
/*
** Allocate a new expression node from a zero-terminated token that has
** already been dequoted.
*/
static Expr sqlite3Expr(
sqlite3 db, /* Handle for sqlite3DbMallocZero() (may be null) */
int op, /* Expression opcode */
string zToken /* Token argument. Might be NULL */
)
{
Token x = new Token();
x.z = zToken;
x.n = !String.IsNullOrEmpty(zToken) ? sqlite3Strlen30(zToken) : 0;
return sqlite3ExprAlloc(db, op, x, 0);
}
/*
** Attach subtrees pLeft and pRight to the Expr node pRoot.
**
** If pRoot==NULL that means that a memory allocation error has occurred.
** In that case, delete the subtrees pLeft and pRight.
*/
static void sqlite3ExprAttachSubtrees(
sqlite3 db,
Expr pRoot,
Expr pLeft,
Expr pRight
)
{
if (pRoot == null)
{
//Debug.Assert( db.mallocFailed != 0 );
sqlite3ExprDelete(db, ref pLeft);
sqlite3ExprDelete(db, ref pRight);
}
else
{
if (pRight != null)
{
pRoot.pRight = pRight;
if ((pRight.flags & EP_ExpCollate) != 0)
{
pRoot.flags |= EP_ExpCollate;
pRoot.pColl = pRight.pColl;
}
}
if (pLeft != null)
{
pRoot.pLeft = pLeft;
if ((pLeft.flags & EP_ExpCollate) != 0)
{
pRoot.flags |= EP_ExpCollate;
pRoot.pColl = pLeft.pColl;
}
}
exprSetHeight(pRoot);
}
}
/*
** Allocate a Expr node which joins as many as two subtrees.
**
** One or both of the subtrees can be NULL. Return a pointer to the new
** Expr node. Or, if an OOM error occurs, set pParse->db->mallocFailed,
** free the subtrees and return NULL.
*/
// OVERLOADS, so I don't need to rewrite parse.c
static Expr sqlite3PExpr(Parse pParse, int op, int null_3, int null_4, int null_5)
{
return sqlite3PExpr(pParse, op, null, null, null);
}
static Expr sqlite3PExpr(Parse pParse, int op, int null_3, int null_4, Token pToken)
{
return sqlite3PExpr(pParse, op, null, null, pToken);
}
static Expr sqlite3PExpr(Parse pParse, int op, Expr pLeft, int null_4, int null_5)
{
return sqlite3PExpr(pParse, op, pLeft, null, null);
}
static Expr sqlite3PExpr(Parse pParse, int op, Expr pLeft, int null_4, Token pToken)
{
return sqlite3PExpr(pParse, op, pLeft, null, pToken);
}
static Expr sqlite3PExpr(Parse pParse, int op, Expr pLeft, Expr pRight, int null_5)
{
return sqlite3PExpr(pParse, op, pLeft, pRight, null);
}
static Expr sqlite3PExpr(
Parse pParse, /* Parsing context */
int op, /* Expression opcode */
Expr pLeft, /* Left operand */
Expr pRight, /* Right operand */
Token pToken /* Argument Token */
)
{
Expr p = sqlite3ExprAlloc(pParse.db, op, pToken, 1);
sqlite3ExprAttachSubtrees(pParse.db, p, pLeft, pRight);
if (p != null)
{
sqlite3ExprCheckHeight(pParse, p.nHeight);
}
return p;
}
/*
** Join two expressions using an AND operator. If either expression is
** NULL, then just return the other expression.
*/
static Expr sqlite3ExprAnd(sqlite3 db, Expr pLeft, Expr pRight)
{
if (pLeft == null)
{
return pRight;
}
else if (pRight == null)
{
return pLeft;
}
else
{
Expr pNew = sqlite3ExprAlloc(db, TK_AND, null, 0);
sqlite3ExprAttachSubtrees(db, pNew, pLeft, pRight);
return pNew;
}
}
/*
** Construct a new expression node for a function with multiple
** arguments.
*/
// OVERLOADS, so I don't need to rewrite parse.c
static Expr sqlite3ExprFunction(Parse pParse, int null_2, Token pToken)
{
return sqlite3ExprFunction(pParse, null, pToken);
}
static Expr sqlite3ExprFunction(Parse pParse, ExprList pList, int null_3)
{
return sqlite3ExprFunction(pParse, pList, null);
}
static Expr sqlite3ExprFunction(Parse pParse, ExprList pList, Token pToken)
{
Expr pNew;
sqlite3 db = pParse.db;
Debug.Assert(pToken != null);
pNew = sqlite3ExprAlloc(db, TK_FUNCTION, pToken, 1);
if (pNew == null)
{
sqlite3ExprListDelete(db, ref pList); /* Avoid memory leak when malloc fails */
return null;
}
pNew.x.pList = pList;
Debug.Assert(!ExprHasProperty(pNew, EP_xIsSelect));
sqlite3ExprSetHeight(pParse, pNew);
return pNew;
}
/*
** Assign a variable number to an expression that encodes a wildcard
** in the original SQL statement.
**
** Wildcards consisting of a single "?" are assigned the next sequential
** variable number.
**
** Wildcards of the form "?nnn" are assigned the number "nnn". We make
** sure "nnn" is not too be to avoid a denial of service attack when
** the SQL statement comes from an external source.
**
** Wildcards of the form ":aaa", "@aaa" or "$aaa" are assigned the same number
** as the previous instance of the same wildcard. Or if this is the first
** instance of the wildcard, the next sequenial variable number is
** assigned.
*/
static void sqlite3ExprAssignVarNumber(Parse pParse, Expr pExpr)
{
sqlite3 db = pParse.db;
string z;
if (pExpr == null)
return;
Debug.Assert(!ExprHasAnyProperty(pExpr, EP_IntValue | EP_Reduced | EP_TokenOnly));
z = pExpr.u.zToken;
Debug.Assert(z != null);
Debug.Assert(z.Length != 0);
if (z.Length == 1)
{
/* Wildcard of the form "?". Assign the next variable number */
Debug.Assert(z[0] == '?');
pExpr.iColumn = (ynVar)(++pParse.nVar);
}
else
{
ynVar x = 0;
int n = sqlite3Strlen30(z);
if (z[0] == '?')
{
/* Wildcard of the form "?nnn". Convert "nnn" to an integer and
** use it as the variable number */
i64 i = 0;
bool bOk = 0 == sqlite3Atoi64(z.Substring(1), ref i, n - 1, SQLITE_UTF8);
pExpr.iColumn = x = (ynVar)i;
testcase(i == 0);
testcase(i == 1);
testcase(i == db.aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] - 1);
testcase(i == db.aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
if (bOk == false || i < 1 || i > db.aLimit[SQLITE_LIMIT_VARIABLE_NUMBER])
{
sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
db.aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
x = 0;
}
if (i > pParse.nVar)
{
pParse.nVar = (int)i;
}
}
else
{
/* Wildcards like ":aaa", "$aaa" or "@aaa". Reuse the same variable
** number as the prior appearance of the same name, or if the name
** has never appeared before, reuse the same variable number
*/
ynVar i;
for (i = 0; i < pParse.nzVar; i++)
{
if (pParse.azVar[i] != null && z.CompareTo(pParse.azVar[i]) == 0) //memcmp(pParse.azVar[i],z,n+1)==0 )
{
pExpr.iColumn = x = (ynVar)(i + 1);
break;
}
}
if (x == 0) x = pExpr.iColumn = (ynVar)(++pParse.nVar);
}
if (x > 0)
{
if (x > pParse.nzVar)
{
//char **a;
//a = sqlite3DbRealloc(db, pParse.azVar, x*sizeof(a[0]));
//if( a==0 ) return; /* Error reported through db.mallocFailed */
//pParse.azVar = a;
//memset(&a[pParse.nzVar], 0, (x-pParse.nzVar)*sizeof(a[0]));
Array.Resize(ref pParse.azVar, x);
pParse.nzVar = x;
}
if (z[0] != '?' || pParse.azVar[x - 1] == null)
{
//sqlite3DbFree(db, pParse.azVar[x-1]);
pParse.azVar[x - 1] = z.Substring(0, n);//sqlite3DbStrNDup( db, z, n );
}
}
}
if (pParse.nErr == 0 && pParse.nVar > db.aLimit[SQLITE_LIMIT_VARIABLE_NUMBER])
{
sqlite3ErrorMsg(pParse, "too many SQL variables");
}
}
/*
** Recursively delete an expression tree.
*/
static void sqlite3ExprDelete(sqlite3 db, ref Expr p)
{
if (p == null)
return;
/* Sanity check: Assert that the IntValue is non-negative if it exists */
Debug.Assert(!ExprHasProperty(p, EP_IntValue) || p.u.iValue >= 0);
if (!ExprHasAnyProperty(p, EP_TokenOnly))
{
sqlite3ExprDelete(db, ref p.pLeft);
sqlite3ExprDelete(db, ref p.pRight);
if (!ExprHasProperty(p, EP_Reduced) && (p.flags2 & EP2_MallocedToken) != 0)
{
#if DEBUG_CLASS_EXPR || DEBUG_CLASS_ALL
sqlite3DbFree( db, ref p.u._zToken );
#else
sqlite3DbFree(db, ref p.u.zToken);
#endif
}
if (ExprHasProperty(p, EP_xIsSelect))
{
sqlite3SelectDelete(db, ref p.x.pSelect);
}
else
{
sqlite3ExprListDelete(db, ref p.x.pList);
}
}
if (!ExprHasProperty(p, EP_Static))
{
sqlite3DbFree(db, ref p);
}
}
/*
** Return the number of bytes allocated for the expression structure
** passed as the first argument. This is always one of EXPR_FULLSIZE,
** EXPR_REDUCEDSIZE or EXPR_TOKENONLYSIZE.
*/
static int exprStructSize(Expr p)
{
if (ExprHasProperty(p, EP_TokenOnly))
return EXPR_TOKENONLYSIZE;
if (ExprHasProperty(p, EP_Reduced))
return EXPR_REDUCEDSIZE;
return EXPR_FULLSIZE;
}
/*
** The dupedExpr*Size() routines each return the number of bytes required
** to store a copy of an expression or expression tree. They differ in
** how much of the tree is measured.
**
** dupedExprStructSize() Size of only the Expr structure
** dupedExprNodeSize() Size of Expr + space for token
** dupedExprSize() Expr + token + subtree components
**
***************************************************************************
**
** The dupedExprStructSize() function returns two values OR-ed together:
** (1) the space required for a copy of the Expr structure only and
** (2) the EP_xxx flags that indicate what the structure size should be.
** The return values is always one of:
**
** EXPR_FULLSIZE
** EXPR_REDUCEDSIZE | EP_Reduced
** EXPR_TOKENONLYSIZE | EP_TokenOnly
**
** The size of the structure can be found by masking the return value
** of this routine with 0xfff. The flags can be found by masking the
** return value with EP_Reduced|EP_TokenOnly.
**
** Note that with flags==EXPRDUP_REDUCE, this routines works on full-size
** (unreduced) Expr objects as they or originally constructed by the parser.
** During expression analysis, extra information is computed and moved into
** later parts of teh Expr object and that extra information might get chopped
** off if the expression is reduced. Note also that it does not work to
** make a EXPRDUP_REDUCE copy of a reduced expression. It is only legal
** to reduce a pristine expression tree from the parser. The implementation
** of dupedExprStructSize() contain multiple Debug.Assert() statements that attempt
** to enforce this constraint.
*/
static int dupedExprStructSize(Expr p, int flags)
{
int nSize;
Debug.Assert(flags == EXPRDUP_REDUCE || flags == 0); /* Only one flag value allowed */
if (0 == (flags & EXPRDUP_REDUCE))
{
nSize = EXPR_FULLSIZE;
}
else
{
Debug.Assert(!ExprHasAnyProperty(p, EP_TokenOnly | EP_Reduced));
Debug.Assert(!ExprHasProperty(p, EP_FromJoin));
Debug.Assert((p.flags2 & EP2_MallocedToken) == 0);
Debug.Assert((p.flags2 & EP2_Irreducible) == 0);
if (p.pLeft != null || p.pRight != null || p.pColl != null || p.x.pList != null || p.x.pSelect != null)
{
nSize = EXPR_REDUCEDSIZE | EP_Reduced;
}
else
{
nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
}
}
return nSize;
}
/*
** This function returns the space in bytes required to store the copy
** of the Expr structure and a copy of the Expr.u.zToken string (if that
** string is defined.)
*/
static int dupedExprNodeSize(Expr p, int flags)
{
int nByte = dupedExprStructSize(p, flags) & 0xfff;
if (!ExprHasProperty(p, EP_IntValue) && p.u.zToken != null)
{
nByte += sqlite3Strlen30(p.u.zToken) + 1;
}
return ROUND8(nByte);
}
/*
** Return the number of bytes required to create a duplicate of the
** expression passed as the first argument. The second argument is a
** mask containing EXPRDUP_XXX flags.
**
** The value returned includes space to create a copy of the Expr struct
** itself and the buffer referred to by Expr.u.zToken, if any.
**
** If the EXPRDUP_REDUCE flag is set, then the return value includes
** space to duplicate all Expr nodes in the tree formed by Expr.pLeft
** and Expr.pRight variables (but not for any structures pointed to or
** descended from the Expr.x.pList or Expr.x.pSelect variables).
*/
static int dupedExprSize(Expr p, int flags)
{
int nByte = 0;
if (p != null)
{
nByte = dupedExprNodeSize(p, flags);
if ((flags & EXPRDUP_REDUCE) != 0)
{
nByte += dupedExprSize(p.pLeft, flags) + dupedExprSize(p.pRight, flags);
}
}
return nByte;
}
/*
** This function is similar to sqlite3ExprDup(), except that if pzBuffer
** is not NULL then *pzBuffer is assumed to point to a buffer large enough
** to store the copy of expression p, the copies of p->u.zToken
** (if applicable), and the copies of the p->pLeft and p->pRight expressions,
** if any. Before returning, *pzBuffer is set to the first byte passed the
** portion of the buffer copied into by this function.
*/
static Expr exprDup(sqlite3 db, Expr p, int flags, ref Expr pzBuffer)
{
Expr pNew = null; /* Value to return */
if (p != null)
{
bool isReduced = (flags & EXPRDUP_REDUCE) != 0;
u32 staticFlag = 0;
Debug.Assert(pzBuffer == null || isReduced);
/* Figure out where to write the new Expr structure. */
{
/* Set nNewSize to the size allocated for the structure pointed to
** by pNew. This is either EXPR_FULLSIZE, EXPR_REDUCEDSIZE or
** EXPR_TOKENONLYSIZE. nToken is set to the number of bytes consumed
** by the copy of the p->u.zToken string (if any).
*/
int nStructSize = dupedExprStructSize(p, flags);
if (isReduced)
{
Debug.Assert(!ExprHasProperty(p, EP_Reduced));
pNew = p.Copy(EXPR_TOKENONLYSIZE);//memcpy( zAlloc, p, nNewSize );
}
else
{
pNew = p.Copy();
}
/* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
unchecked
{
pNew.flags &= (ushort)(~(EP_Reduced | EP_TokenOnly | EP_Static));
}
pNew.flags |= (ushort)(nStructSize & (EP_Reduced | EP_TokenOnly));
pNew.flags |= (ushort)staticFlag;
if (0 == ((p.flags | pNew.flags) & EP_TokenOnly))
{
/* Fill in the pNew.x.pSelect or pNew.x.pList member. */
if (ExprHasProperty(p, EP_xIsSelect))
{
pNew.x.pSelect = sqlite3SelectDup(db, p.x.pSelect, isReduced ? 1 : 0);
}
else
{
pNew.x.pList = sqlite3ExprListDup(db, p.x.pList, isReduced ? 1 : 0);
}
}
/* Fill in pNew.pLeft and pNew.pRight. */
if (ExprHasAnyProperty(pNew, EP_Reduced | EP_TokenOnly))
{
if (ExprHasProperty(pNew, EP_Reduced))
{
pNew.pLeft = exprDup(db, p.pLeft, EXPRDUP_REDUCE, ref pzBuffer);
pNew.pRight = exprDup(db, p.pRight, EXPRDUP_REDUCE, ref pzBuffer);