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+/*
+** 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.
+**
+*************************************************************************
+** Header file for the Virtual DataBase Engine (VDBE)
+**
+** This header defines the interface to the virtual database engine
+** or VDBE.  The VDBE implements an abstract machine that runs a
+** simple program to access and modify the underlying database.
+**
+** $Id$
+*/
+#ifndef _SQLITE_VDBE_H_
+#define _SQLITE_VDBE_H_
+#include <stdio.h>
+
+/*
+** A single VDBE is an opaque structure named "Vdbe".  Only routines
+** in the source file sqliteVdbe.c are allowed to see the insides
+** of this structure.
+*/
+typedef struct Vdbe Vdbe;
+
+/*
+** A single instruction of the virtual machine has an opcode
+** and as many as three operands.  The instruction is recorded
+** as an instance of the following structure:
+*/
+struct VdbeOp {
+  u8 opcode;          /* What operation to perform */
+  int p1;             /* First operand */
+  int p2;             /* Second parameter (often the jump destination) */
+  char *p3;           /* Third parameter */
+  int p3type;         /* P3_STATIC, P3_DYNAMIC or P3_POINTER */
+#ifdef VDBE_PROFILE
+  int cnt;            /* Number of times this instruction was executed */
+  long long cycles;   /* Total time spend executing this instruction */
+#endif
+};
+typedef struct VdbeOp VdbeOp;
+
+/*
+** A smaller version of VdbeOp used for the VdbeAddOpList() function because
+** it takes up less space.
+*/
+struct VdbeOpList {
+  u8 opcode;          /* What operation to perform */
+  signed char p1;     /* First operand */
+  short int p2;       /* Second parameter (often the jump destination) */
+  char *p3;           /* Third parameter */
+};
+typedef struct VdbeOpList VdbeOpList;
+
+/*
+** Allowed values of VdbeOp.p3type
+*/
+#define P3_NOTUSED    0   /* The P3 parameter is not used */
+#define P3_DYNAMIC  (-1)  /* Pointer to a string obtained from sqliteMalloc() */
+#define P3_STATIC   (-2)  /* Pointer to a static string */
+#define P3_POINTER  (-3)  /* P3 is a pointer to some structure or object */
+#define P3_COLLSEQ  (-4)  /* P3 is a pointer to a CollSeq structure */
+#define P3_FUNCDEF  (-5)  /* P3 is a pointer to a FuncDef structure */
+#define P3_KEYINFO  (-6)  /* P3 is a pointer to a KeyInfo structure */
+#define P3_VDBEFUNC (-7)  /* P3 is a pointer to a VdbeFunc structure */
+
+/* When adding a P3 argument using P3_KEYINFO, a copy of the KeyInfo structure
+** is made.  That copy is freed when the Vdbe is finalized.  But if the
+** argument is P3_KEYINFO_HANDOFF, the passed in pointer is used.  It still
+** gets freed when the Vdbe is finalized so it still should be obtained
+** from a single sqliteMalloc().  But no copy is made and the calling
+** function should *not* try to free the KeyInfo.
+*/
+#define P3_KEYINFO_HANDOFF (-7)
+
+/*
+** The following macro converts a relative address in the p2 field
+** of a VdbeOp structure into a negative number so that 
+** sqlite3VdbeAddOpList() knows that the address is relative.  Calling
+** the macro again restores the address.
+*/
+#define ADDR(X)  (-1-(X))
+
+/*
+** The makefile scans the vdbe.c source file and creates the "opcodes.h"
+** header file that defines a number for each opcode used by the VDBE.
+*/
+#include "opcodes.h"
+
+/*
+** Prototypes for the VDBE interface.  See comments on the implementation
+** for a description of what each of these routines does.
+*/
+Vdbe *sqlite3VdbeCreate(sqlite3*);
+void sqlite3VdbeCreateCallback(Vdbe*, int*);
+int sqlite3VdbeAddOp(Vdbe*,int,int,int);
+int sqlite3VdbeOp3(Vdbe*,int,int,int,const char *zP3,int);
+int sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp);
+void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
+void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
+void sqlite3VdbeChangeP3(Vdbe*, int addr, const char *zP1, int N);
+void sqlite3VdbeDequoteP3(Vdbe*, int addr);
+int sqlite3VdbeFindOp(Vdbe*, int, int, int);
+VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
+int sqlite3VdbeMakeLabel(Vdbe*);
+void sqlite3VdbeDelete(Vdbe*);
+void sqlite3VdbeMakeReady(Vdbe*,int,int,int,int);
+int sqlite3VdbeFinalize(Vdbe*);
+void sqlite3VdbeResolveLabel(Vdbe*, int);
+int sqlite3VdbeCurrentAddr(Vdbe*);
+void sqlite3VdbeTrace(Vdbe*,FILE*);
+int sqlite3VdbeReset(Vdbe*);
+int sqliteVdbeSetVariables(Vdbe*,int,const char**);
+void sqlite3VdbeSetNumCols(Vdbe*,int);
+int sqlite3VdbeSetColName(Vdbe*, int, const char *, int);
+void sqlite3VdbeCountChanges(Vdbe*);
+
+#ifndef NDEBUG
+  void sqlite3VdbeComment(Vdbe*, const char*, ...);
+# define VdbeComment(X)  sqlite3VdbeComment X
+#else
+# define VdbeComment(X)
+#endif
+
+#endif