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Overview
Comment:Add operands p4 and p5 to the VdbeOp structure. (CVS 4659)
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SHA1: ad528735e41ce2ec2e680b12e562d4ddb6650985
User & Date: drh 2008-01-02 17:25:55
Context
2008-01-03
00:01
Refactoring the VM. The P3 parameter is changed to P4. A P5 parameter is added (though not currently used.) Add routines sqlite3VdbeAddOpX() where X is one of 0, 1, 2, 3, or 4. (CVS 4660) check-in: 027875e4 user: drh tags: trunk
2008-01-02
17:25
Add operands p4 and p5 to the VdbeOp structure. (CVS 4659) check-in: ad528735 user: drh tags: trunk
17:11
Minor optimizations for sub-selects in EXISTS(...) expressions: Discard any DISTINCT or ORDER BY clauses and do not calculate any column values. (CVS 4658) check-in: fbd17a89 user: danielk1977 tags: trunk
Changes
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Changes to src/vdbe.h.

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*************************************************************************
** 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: vdbe.h,v 1.116 2008/01/02 00:34:37 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
#include <stdio.h>

/*
** A single VDBE is an opaque structure named "Vdbe".  Only routines
................................................................................
** 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 */
  char p3type;        /* One of the P3_xxx constants defined below */


  int p1;             /* First operand */
  int p2;             /* Second parameter (often the jump destination) */
  union {             /* Third parameter */
    int i;              /* Integer value if p3type==P3_INT32 */
    char *p;            /* A pointer for all other value sof p3type */
  } p3;
#ifdef SQLITE_DEBUG
  char *zComment;     /* Comment to improve readability */
#endif
#ifdef VDBE_PROFILE
  int cnt;            /* Number of times this instruction was executed */
  long long cycles;   /* Total time spend executing this instruction */
#endif







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*************************************************************************
** 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: vdbe.h,v 1.117 2008/01/02 17:25:55 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
#include <stdio.h>

/*
** A single VDBE is an opaque structure named "Vdbe".  Only routines
................................................................................
** 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 */
  char p3type;        /* One of the P3_xxx constants defined below */
  char p4type;        /* One of the P3_xxx constants for p4 */
  u8 p5;              /* Fifth parameter is an unsigned character */
  int p1;             /* First operand */
  int p2;             /* Second parameter (often the jump destination) */
  union {             /* Third and forth parameters */
    int i;              /* Integer value if p3type==P3_INT32 */
    char *p;            /* A pointer for all other value sof p3type */
  } p3, p4;
#ifdef SQLITE_DEBUG
  char *zComment;     /* Comment to improve readability */
#endif
#ifdef VDBE_PROFILE
  int cnt;            /* Number of times this instruction was executed */
  long long cycles;   /* Total time spend executing this instruction */
#endif