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Overview
Comment:Get the ABORT conflict resolution algorithm working. (CVS 362)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:9be4d4c6f12056782966396dca0b8e2d384d0cf2
User & Date: drh 2002-02-02 18:49:20
Context
2002-02-03
00:56
Five-algorithm conflict resolution appears to be working. (CVS 363) check-in: 0115518f user: drh tags: trunk
2002-02-02
18:49
Get the ABORT conflict resolution algorithm working. (CVS 362) check-in: 9be4d4c6 user: drh tags: trunk
15:01
Checkpoint code added to the pager. Regression tests work but the new APIs have not been tested yet. (CVS 361) check-in: aaa53e11 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/btree.c.

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** 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.
**
*************************************************************************
** $Id: btree.c,v 1.46 2002/01/04 03:09:29 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.
................................................................................
/*
** Everything we need to know about an open database
*/
struct Btree {
  Pager *pPager;        /* The page cache */
  BtCursor *pCursor;    /* A list of all open cursors */
  PageOne *page1;       /* First page of the database */
  int inTrans;          /* True if a transaction is in progress */

  Hash locks;           /* Key: root page number.  Data: lock count */
};
typedef Btree Bt;

/*
** A cursor is a pointer to a particular entry in the BTree.
** The entry is identified by its MemPage and the index in
................................................................................
** If there is a transaction in progress, this routine is a no-op.
*/
static void unlockBtreeIfUnused(Btree *pBt){
  if( pBt->inTrans==0 && pBt->pCursor==0 && pBt->page1!=0 ){
    sqlitepager_unref(pBt->page1);
    pBt->page1 = 0;
    pBt->inTrans = 0;

  }
}

/*
** Create a new database by initializing the first two pages of the
** file.
*/
................................................................................
  }
  rc = sqlitepager_write(pBt->page1);
  if( rc==SQLITE_OK ){
    rc = newDatabase(pBt);
  }
  if( rc==SQLITE_OK ){
    pBt->inTrans = 1;

  }else{
    unlockBtreeIfUnused(pBt);
  }
  return rc;
}

/*
................................................................................
** are no active cursors, it also releases the read lock.
*/
int sqliteBtreeCommit(Btree *pBt){
  int rc;
  if( pBt->inTrans==0 ) return SQLITE_ERROR;
  rc = sqlitepager_commit(pBt->pPager);
  pBt->inTrans = 0;

  unlockBtreeIfUnused(pBt);
  return rc;
}

/*
** Rollback the transaction in progress.  All cursors will be
** invalided by this operation.  Any attempt to use a cursor
................................................................................
** are no active cursors, it also releases the read lock.
*/
int sqliteBtreeRollback(Btree *pBt){
  int rc;
  BtCursor *pCur;
  if( pBt->inTrans==0 ) return SQLITE_OK;
  pBt->inTrans = 0;

  for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
    if( pCur->pPage ){
      sqlitepager_unref(pCur->pPage);
      pCur->pPage = 0;
    }
  }
  rc = sqlitepager_rollback(pBt->pPager);
  unlockBtreeIfUnused(pBt);
  return rc;
}
























































/*
** Create a new cursor for the BTree whose root is on the page
** iTable.  The act of acquiring a cursor gets a read lock on 
** the database file.
**
** If wrFlag==0, then the cursor can only be used for reading.







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** 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.
**
*************************************************************************
** $Id: btree.c,v 1.47 2002/02/02 18:49:20 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.
................................................................................
/*
** Everything we need to know about an open database
*/
struct Btree {
  Pager *pPager;        /* The page cache */
  BtCursor *pCursor;    /* A list of all open cursors */
  PageOne *page1;       /* First page of the database */
  u8 inTrans;           /* True if a transaction is in progress */
  u8 inCkpt;            /* True if there is a checkpoint on the transaction */
  Hash locks;           /* Key: root page number.  Data: lock count */
};
typedef Btree Bt;

/*
** A cursor is a pointer to a particular entry in the BTree.
** The entry is identified by its MemPage and the index in
................................................................................
** If there is a transaction in progress, this routine is a no-op.
*/
static void unlockBtreeIfUnused(Btree *pBt){
  if( pBt->inTrans==0 && pBt->pCursor==0 && pBt->page1!=0 ){
    sqlitepager_unref(pBt->page1);
    pBt->page1 = 0;
    pBt->inTrans = 0;
    pBt->inCkpt = 0;
  }
}

/*
** Create a new database by initializing the first two pages of the
** file.
*/
................................................................................
  }
  rc = sqlitepager_write(pBt->page1);
  if( rc==SQLITE_OK ){
    rc = newDatabase(pBt);
  }
  if( rc==SQLITE_OK ){
    pBt->inTrans = 1;
    pBt->inCkpt = 0;
  }else{
    unlockBtreeIfUnused(pBt);
  }
  return rc;
}

/*
................................................................................
** are no active cursors, it also releases the read lock.
*/
int sqliteBtreeCommit(Btree *pBt){
  int rc;
  if( pBt->inTrans==0 ) return SQLITE_ERROR;
  rc = sqlitepager_commit(pBt->pPager);
  pBt->inTrans = 0;
  pBt->inCkpt = 0;
  unlockBtreeIfUnused(pBt);
  return rc;
}

/*
** Rollback the transaction in progress.  All cursors will be
** invalided by this operation.  Any attempt to use a cursor
................................................................................
** are no active cursors, it also releases the read lock.
*/
int sqliteBtreeRollback(Btree *pBt){
  int rc;
  BtCursor *pCur;
  if( pBt->inTrans==0 ) return SQLITE_OK;
  pBt->inTrans = 0;
  pBt->inCkpt = 0;
  for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
    if( pCur->pPage ){
      sqlitepager_unref(pCur->pPage);
      pCur->pPage = 0;
    }
  }
  rc = sqlitepager_rollback(pBt->pPager);
  unlockBtreeIfUnused(pBt);
  return rc;
}

/*
** Set the checkpoint for the current transaction.  The checkpoint serves
** as a sub-transaction that can be rolled back independently of the
** main transaction.  You must start a transaction before starting a
** checkpoint.  The checkpoint is ended automatically if the transaction
** commits or rolls back.
**
** Only one checkpoint may be active at a time.  It is an error to try
** to start a new checkpoint if another checkpoint is already active.
*/
int sqliteBtreeBeginCkpt(Btree *pBt){
  int rc;
  if( !pBt->inTrans || pBt->inCkpt ) return SQLITE_ERROR;
  rc = sqlitepager_ckpt_begin(pBt->pPager);
  pBt->inCkpt = 1;
  return rc;
}


/*
** Commit a checkpoint to transaction currently in progress.  If no
** checkpoint is active, this is a no-op.
*/
int sqliteBtreeCommitCkpt(Btree *pBt){
  int rc;
  if( pBt->inCkpt ){
    rc = sqlitepager_ckpt_commit(pBt->pPager);
  }else{
    rc = SQLITE_OK;
  }
  return rc;
}

/*
** Rollback the checkpoint to the current transaction.  If there
** is no active checkpoint or transaction, this routine is a no-op.
**
** All cursors will be invalided by this operation.  Any attempt
** to use a cursor that was open at the beginning of this operation
** will result in an error.
*/
int sqliteBtreeRollbackCkpt(Btree *pBt){
  int rc;
  BtCursor *pCur;
  if( pBt->inCkpt==0 ) return SQLITE_OK;
  for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
    if( pCur->pPage ){
      sqlitepager_unref(pCur->pPage);
      pCur->pPage = 0;
    }
  }
  rc = sqlitepager_ckpt_rollback(pBt->pPager);
  return rc;
}

/*
** Create a new cursor for the BTree whose root is on the page
** iTable.  The act of acquiring a cursor gets a read lock on 
** the database file.
**
** If wrFlag==0, then the cursor can only be used for reading.

Changes to src/btree.h.

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**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the sqlite B-Tree file
** subsystem.  See comments in the source code for a detailed description
** of what each interface routine does.
**
** @(#) $Id: btree.h,v 1.19 2002/01/04 03:09:30 drh Exp $
*/
#ifndef _BTREE_H_
#define _BTREE_H_

typedef struct Btree Btree;
typedef struct BtCursor BtCursor;

................................................................................
int sqliteBtreeOpen(const char *zFilename, int mode, int nPg, Btree **ppBtree);
int sqliteBtreeClose(Btree*);
int sqliteBtreeSetCacheSize(Btree*, int);

int sqliteBtreeBeginTrans(Btree*);
int sqliteBtreeCommit(Btree*);
int sqliteBtreeRollback(Btree*);




int sqliteBtreeCreateTable(Btree*, int*);
int sqliteBtreeCreateIndex(Btree*, int*);
int sqliteBtreeDropTable(Btree*, int);
int sqliteBtreeClearTable(Btree*, int);

int sqliteBtreeCursor(Btree*, int iTable, int wrFlag, BtCursor **ppCur);







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**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the sqlite B-Tree file
** subsystem.  See comments in the source code for a detailed description
** of what each interface routine does.
**
** @(#) $Id: btree.h,v 1.20 2002/02/02 18:49:20 drh Exp $
*/
#ifndef _BTREE_H_
#define _BTREE_H_

typedef struct Btree Btree;
typedef struct BtCursor BtCursor;

................................................................................
int sqliteBtreeOpen(const char *zFilename, int mode, int nPg, Btree **ppBtree);
int sqliteBtreeClose(Btree*);
int sqliteBtreeSetCacheSize(Btree*, int);

int sqliteBtreeBeginTrans(Btree*);
int sqliteBtreeCommit(Btree*);
int sqliteBtreeRollback(Btree*);
int sqliteBtreeBeginCkpt(Btree*);
int sqliteBtreeCommitCkpt(Btree*);
int sqliteBtreeRollbackCkpt(Btree*);

int sqliteBtreeCreateTable(Btree*, int*);
int sqliteBtreeCreateIndex(Btree*, int*);
int sqliteBtreeDropTable(Btree*, int);
int sqliteBtreeClearTable(Btree*, int);

int sqliteBtreeCursor(Btree*, int iTable, int wrFlag, BtCursor **ppCur);

Changes to src/build.c.

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**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.70 2002/01/31 15:54:22 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called after a single SQL statement has been
** parsed and we want to execute the VDBE code to implement 
................................................................................
        " may not be modified", 0);
    pParse->nErr++;
    goto copy_cleanup;
  }
  v = sqliteGetVdbe(pParse);
  if( v ){
    int openOp;
    sqliteBeginWriteOperation(pParse);
    addr = sqliteVdbeAddOp(v, OP_FileOpen, 0, 0);
    sqliteVdbeChangeP3(v, addr, pFilename->z, pFilename->n);
    sqliteVdbeDequoteP3(v, addr);
    openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite;
    sqliteVdbeAddOp(v, openOp, 0, pTab->tnum);
    sqliteVdbeChangeP3(v, -1, pTab->zName, P3_STATIC);
    for(i=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
................................................................................
  }
  db->flags &= ~SQLITE_InTrans;
  db->onError = OE_Default;
}

/*
** Generate VDBE code that prepares for doing an operation that
** might change the database.  If we are in the middle of a transaction,
** then this sets a checkpoint.  If we are not in a transaction, then
** start a transaction.

*/
void sqliteBeginWriteOperation(Parse *pParse){
  Vdbe *v;
  v = sqliteGetVdbe(pParse);
  if( v==0 ) return;
  if( pParse->db->flags & SQLITE_InTrans ){
    /* sqliteVdbeAddOp(v, OP_CheckPoint, 0, 0); */
  }else{

















    sqliteVdbeAddOp(v, OP_Transaction, 0, 0);
    sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0);
    pParse->schemaVerified = 1;


  }
}

/*
** Generate code that concludes an operation that may have changed
** the database.  This is a companion function to BeginWriteOperation().
** If a transaction was started, then commit it.  If a checkpoint was







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**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.71 2002/02/02 18:49:20 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called after a single SQL statement has been
** parsed and we want to execute the VDBE code to implement 
................................................................................
        " may not be modified", 0);
    pParse->nErr++;
    goto copy_cleanup;
  }
  v = sqliteGetVdbe(pParse);
  if( v ){
    int openOp;
    sqliteBeginMultiWriteOperation(pParse);
    addr = sqliteVdbeAddOp(v, OP_FileOpen, 0, 0);
    sqliteVdbeChangeP3(v, addr, pFilename->z, pFilename->n);
    sqliteVdbeDequoteP3(v, addr);
    openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite;
    sqliteVdbeAddOp(v, openOp, 0, pTab->tnum);
    sqliteVdbeChangeP3(v, -1, pTab->zName, P3_STATIC);
    for(i=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
................................................................................
  }
  db->flags &= ~SQLITE_InTrans;
  db->onError = OE_Default;
}

/*
** Generate VDBE code that prepares for doing an operation that
** might change the database.  The operation will be atomic in the
** sense that it will either do its changes completely or not at
** all.  So there is not need to set a checkpoint is a transaction
** is already in effect.
*/
void sqliteBeginWriteOperation(Parse *pParse){
  Vdbe *v;
  v = sqliteGetVdbe(pParse);
  if( v==0 ) return;
  if( (pParse->db->flags & SQLITE_InTrans)==0  ){
    sqliteVdbeAddOp(v, OP_Transaction, 0, 0);
    sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0);
    pParse->schemaVerified = 1;
  }
}

/*
** Generate VDBE code that prepares for doing an operation that
** might change the database.  The operation might not be atomic in
** the sense that an error may be discovered and the operation might
** abort after some changes have been made.  If we are in the middle 
** of a transaction, then this sets a checkpoint.  If we are not in
** a transaction, then start a transaction.
*/
void sqliteBeginMultiWriteOperation(Parse *pParse){
  Vdbe *v;
  v = sqliteGetVdbe(pParse);
  if( v==0 ) return;
  if( (pParse->db->flags & SQLITE_InTrans)==0 ){
    sqliteVdbeAddOp(v, OP_Transaction, 0, 0);
    sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0);
    pParse->schemaVerified = 1;
  }else{
    sqliteVdbeAddOp(v, OP_Checkpoint, 0, 0);
  }
}

/*
** Generate code that concludes an operation that may have changed
** the database.  This is a companion function to BeginWriteOperation().
** If a transaction was started, then commit it.  If a checkpoint was

Changes to src/insert.c.

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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle INSERT statements in SQLite.
**
** $Id: insert.c,v 1.39 2002/01/31 15:54:22 drh Exp $
*/
#include "sqliteInt.h"

/*
** This routine is call to handle SQL of the following forms:
**
**    insert into TABLE (IDLIST) values(EXPRLIST)
................................................................................
    goto insert_cleanup;
  }

  /* Allocate a VDBE
  */
  v = sqliteGetVdbe(pParse);
  if( v==0 ) goto insert_cleanup;



  sqliteBeginWriteOperation(pParse);


  /* Figure out how many columns of data are supplied.  If the data
  ** is coming from a SELECT statement, then this step has to generate
  ** all the code to implement the SELECT statement and leave the data
  ** in a temporary table.  If data is coming from an expression list,
  ** then we just have to count the number of expressions.
  */







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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle INSERT statements in SQLite.
**
** $Id: insert.c,v 1.40 2002/02/02 18:49:20 drh Exp $
*/
#include "sqliteInt.h"

/*
** This routine is call to handle SQL of the following forms:
**
**    insert into TABLE (IDLIST) values(EXPRLIST)
................................................................................
    goto insert_cleanup;
  }

  /* Allocate a VDBE
  */
  v = sqliteGetVdbe(pParse);
  if( v==0 ) goto insert_cleanup;
  if( pSelect ){
    sqliteBeginMultiWriteOperation(pParse);
  }else{
    sqliteBeginWriteOperation(pParse);
  }

  /* Figure out how many columns of data are supplied.  If the data
  ** is coming from a SELECT statement, then this step has to generate
  ** all the code to implement the SELECT statement and leave the data
  ** in a temporary table.  If data is coming from an expression list,
  ** then we just have to count the number of expressions.
  */

Changes to src/pager.c.

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** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.37 2002/02/02 15:01:16 drh Exp $
*/
#include "sqliteInt.h"
#include "pager.h"
#include "os.h"
#include <assert.h>
#include <string.h>

................................................................................
**                       file at the same time.
**
**   SQLITE_WRITELOCK    The page cache is writing the database.
**                       Access is exclusive.  No other processes or
**                       threads can be reading or writing while one
**                       process is writing.
**
**   SQLITE_CHECKPOINT   The page cache is writing to the database and
**                       preserving its changes so that it can back them
**                       out later if need be.
**
** The page cache comes up in SQLITE_UNLOCK.  The first time a
** sqlite_page_get() occurs, the state transitions to SQLITE_READLOCK.
** After all pages have been released using sqlite_page_unref(),
** the state transitions back to SQLITE_UNLOCK.  The first time
** that sqlite_page_write() is called, the state transitions to
** SQLITE_WRITELOCK.  (Note that sqlite_page_write() can only be
** called on an outstanding page which means that the pager must
** be in SQLITE_READLOCK before it transitions to SQLITE_WRITELOCK.)
** The sqlite_page_rollback() and sqlite_page_commit() functions 
** transition the state from SQLITE_WRITELOCK back to SQLITE_READLOCK.
**
** The sqlite_ckpt_begin() function moves the state from SQLITE_WRITELOCK
** to SQLITE_CHECKPOINT.  The state transitions back to SQLITE_WRITELOCK
** on calls to sqlite_ckpt_commit() or sqlite_ckpt_rollback().  While
** in SQLITE_CHECKPOINT, calls to sqlite_commit() or sqlite_rollback()
** transition directly back to SQLITE_READLOCK.
**
** The code does unequality comparisons on these constants so the order
** must be preserved.
*/
#define SQLITE_UNLOCK      0
#define SQLITE_READLOCK    1
#define SQLITE_WRITELOCK   2
#define SQLITE_CHECKPOINT  3


/*
** Each in-memory image of a page begins with the following header.
** This header is only visible to this pager module.  The client
** code that calls pager sees only the data that follows the header.
*/
................................................................................
** write lock and acquires a read lock in its place.  The journal file
** is deleted and closed.
*/
static int pager_unwritelock(Pager *pPager){
  int rc;
  PgHdr *pPg;
  if( pPager->state<SQLITE_WRITELOCK ) return SQLITE_OK;

  sqliteOsClose(&pPager->jfd);
  pPager->journalOpen = 0;
  sqliteOsDelete(pPager->zJournal);
  rc = sqliteOsReadLock(&pPager->fd);
  assert( rc==SQLITE_OK );
  sqliteFree( pPager->aInCkpt );
  sqliteFree( pPager->aInJournal );
  pPager->aInJournal = 0;
  for(pPg=pPager->pAll; pPg; pPg=pPg->pNextAll){
    pPg->inJournal = 0;
    pPg->dirty = 0;
  }
  pPager->state = SQLITE_READLOCK;
................................................................................
** jfd.  Playback this one page.
*/
static int pager_playback_one_page(Pager *pPager, OsFile *jfd){
  int rc;
  PgHdr *pPg;              /* An existing page in the cache */
  PageRecord pgRec;

  rc = sqliteOsRead(&pPager->jfd, &pgRec, sizeof(pgRec));
  if( rc!=SQLITE_OK ) return rc;

  /* Sanity checking on the page */
  if( pgRec.pgno>pPager->dbSize || pgRec.pgno==0 ) return SQLITE_CORRUPT;

  /* Playback the page.  Update the in-memory copy of the page
  ** at the same time, if there is one.
................................................................................

/*
** Playback the checkpoint journal.
**
** This is similar to playing back the transaction journal but with
** a few extra twists.
**
**    (1)  The original size of the database file is stored in

**         pPager->ckptSize, not in the journal file itself.
**
**    (2)  In addition to playing back the checkpoint journal, also
**         playback all pages of the transaction journal beginning
**         at offset pPager->ckptJSize.
*/
static int pager_ckpt_playback(Pager *pPager){
  int nRec;                /* Number of Records */
  int i;                   /* Loop counter */
  int rc;

  /* Truncate the database back to its original size.
  */
  rc = sqliteOsTruncate(&pPager->fd, pPager->ckptSize);
  pPager->dbSize = pPager->ckptSize;

  /* Figure out how many records are in the checkpoint journal.
  */
  assert( pPager->ckptOpen && pPager->journalOpen );
  sqliteOsSeek(&pPager->cpfd, 0);
  rc = sqliteOsFileSize(&pPager->cpfd, &nRec);
................................................................................
  for(i=nRec-1; i>=0; i--){
    rc = pager_playback_one_page(pPager, &pPager->jfd);
    if( rc!=SQLITE_OK ) goto end_ckpt_playback;
  }
  

end_ckpt_playback:
  sqliteOsClose(&pPager->cpfd);
  pPager->ckptOpen = 0;
  if( rc!=SQLITE_OK ){
    pager_unwritelock(pPager);
    pPager->errMask |= PAGER_ERR_CORRUPT;
    rc = SQLITE_CORRUPT;
  }else{
    rc = pager_unwritelock(pPager);
  }
  return rc;
}

/*
** Change the maximum number of in-memory pages that are allowed.
*/
................................................................................
** and their memory is freed.  Any attempt to use a page associated
** with this page cache after this function returns will likely
** result in a coredump.
*/
int sqlitepager_close(Pager *pPager){
  PgHdr *pPg, *pNext;
  switch( pPager->state ){
    case SQLITE_CHECKPOINT:
    case SQLITE_WRITELOCK: {
      sqlitepager_rollback(pPager);
      sqliteOsUnlock(&pPager->fd);
      assert( pPager->journalOpen==0 );
      break;
    }
    case SQLITE_READLOCK: {
................................................................................
    }
    pPg->pgno = pgno;
    if( pPager->aInJournal && (int)pgno<=pPager->origDbSize ){
      pPg->inJournal = (pPager->aInJournal[pgno/8] & (1<<(pgno&7)))!=0;
    }else{
      pPg->inJournal = 0;
    }
    if( pPager->aInCkpt && (int)pgno*SQLITE_PAGE_SIZE<=pPager->ckptSize ){
      pPg->inCkpt = (pPager->aInCkpt[pgno/8] & (1<<(pgno&7)))!=0;
    }else{
      pPg->inCkpt = 0;
    }
    pPg->dirty = 0;
    pPg->nRef = 1;
    REFINFO(pPg);
................................................................................
      pPg->inCkpt = 1;
    }
  }

  /* If the checkpoint journal is open and the page is not in it,
  ** then write the current page to the checkpoint journal.
  */
  if( pPager->ckptOpen && !pPg->inCkpt 
      && (int)pPg->pgno*SQLITE_PAGE_SIZE < pPager->ckptSize ){
    assert( pPg->inJournal );
    rc = sqliteOsWrite(&pPager->cpfd, &pPg->pgno, sizeof(Pgno));
    if( rc==SQLITE_OK ){
      rc = sqliteOsWrite(&pPager->cpfd, pData, SQLITE_PAGE_SIZE);
    }
    if( rc!=SQLITE_OK ){
      sqlitepager_rollback(pPager);
................................................................................
  pPager->aInCkpt = sqliteMalloc( pPager->dbSize/8 + 1 );
  if( pPager->aInCkpt==0 ){
    sqliteOsReadLock(&pPager->fd);
    return SQLITE_NOMEM;
  }
  rc = sqliteOsFileSize(&pPager->jfd, &pPager->ckptJSize);
  if( rc ) goto ckpt_begin_failed;
  pPager->ckptSize = pPager->dbSize * SQLITE_PAGE_SIZE;
  rc = sqlitepager_opentemp(zTemp, &pPager->cpfd);
  if( rc ) goto ckpt_begin_failed;
  pPager->ckptOpen = 1;
  return SQLITE_OK;
 
ckpt_begin_failed:
  if( pPager->aInCkpt ){
................................................................................
  return rc;
}

/*
** Commit a checkpoint.
*/
int sqlitepager_ckpt_commit(Pager *pPager){
  assert( pPager->ckptOpen );

  sqliteOsClose(&pPager->cpfd);
  sqliteFree(pPager->aInCkpt);
  pPager->ckptOpen = 0;






  return SQLITE_OK;
}

/*
** Rollback a checkpoint.
*/
int sqlitepager_ckpt_rollback(Pager *pPager){
  int rc;
  assert( pPager->ckptOpen );
  rc = pager_ckpt_playback(pPager);
  sqliteOsClose(&pPager->cpfd);
  sqliteFree(pPager->aInCkpt);
  pPager->ckptOpen = 0;

  return rc;
}

#if SQLITE_TEST
/*
** Print a listing of all referenced pages and their ref count.
*/







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** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.38 2002/02/02 18:49:20 drh Exp $
*/
#include "sqliteInt.h"
#include "pager.h"
#include "os.h"
#include <assert.h>
#include <string.h>

................................................................................
**                       file at the same time.
**
**   SQLITE_WRITELOCK    The page cache is writing the database.
**                       Access is exclusive.  No other processes or
**                       threads can be reading or writing while one
**                       process is writing.
**




** The page cache comes up in SQLITE_UNLOCK.  The first time a
** sqlite_page_get() occurs, the state transitions to SQLITE_READLOCK.
** After all pages have been released using sqlite_page_unref(),
** the state transitions back to SQLITE_UNLOCK.  The first time
** that sqlite_page_write() is called, the state transitions to
** SQLITE_WRITELOCK.  (Note that sqlite_page_write() can only be
** called on an outstanding page which means that the pager must
** be in SQLITE_READLOCK before it transitions to SQLITE_WRITELOCK.)
** The sqlite_page_rollback() and sqlite_page_commit() functions 
** transition the state from SQLITE_WRITELOCK back to SQLITE_READLOCK.









*/
#define SQLITE_UNLOCK      0
#define SQLITE_READLOCK    1
#define SQLITE_WRITELOCK   2



/*
** Each in-memory image of a page begins with the following header.
** This header is only visible to this pager module.  The client
** code that calls pager sees only the data that follows the header.
*/
................................................................................
** write lock and acquires a read lock in its place.  The journal file
** is deleted and closed.
*/
static int pager_unwritelock(Pager *pPager){
  int rc;
  PgHdr *pPg;
  if( pPager->state<SQLITE_WRITELOCK ) return SQLITE_OK;
  sqlitepager_ckpt_commit(pPager);
  sqliteOsClose(&pPager->jfd);
  pPager->journalOpen = 0;
  sqliteOsDelete(pPager->zJournal);
  rc = sqliteOsReadLock(&pPager->fd);
  assert( rc==SQLITE_OK );

  sqliteFree( pPager->aInJournal );
  pPager->aInJournal = 0;
  for(pPg=pPager->pAll; pPg; pPg=pPg->pNextAll){
    pPg->inJournal = 0;
    pPg->dirty = 0;
  }
  pPager->state = SQLITE_READLOCK;
................................................................................
** jfd.  Playback this one page.
*/
static int pager_playback_one_page(Pager *pPager, OsFile *jfd){
  int rc;
  PgHdr *pPg;              /* An existing page in the cache */
  PageRecord pgRec;

  rc = sqliteOsRead(jfd, &pgRec, sizeof(pgRec));
  if( rc!=SQLITE_OK ) return rc;

  /* Sanity checking on the page */
  if( pgRec.pgno>pPager->dbSize || pgRec.pgno==0 ) return SQLITE_CORRUPT;

  /* Playback the page.  Update the in-memory copy of the page
  ** at the same time, if there is one.
................................................................................

/*
** Playback the checkpoint journal.
**
** This is similar to playing back the transaction journal but with
** a few extra twists.
**
**    (1)  The number of pages in the database file at the start of
**         the checkpoint is stored in pPager->ckptSize, not in the
**         journal file itself.
**
**    (2)  In addition to playing back the checkpoint journal, also
**         playback all pages of the transaction journal beginning
**         at offset pPager->ckptJSize.
*/
static int pager_ckpt_playback(Pager *pPager){
  int nRec;                /* Number of Records */
  int i;                   /* Loop counter */
  int rc;

  /* Truncate the database back to its original size.
  */
  rc = sqliteOsTruncate(&pPager->fd, pPager->ckptSize*SQLITE_PAGE_SIZE);
  pPager->dbSize = pPager->ckptSize;

  /* Figure out how many records are in the checkpoint journal.
  */
  assert( pPager->ckptOpen && pPager->journalOpen );
  sqliteOsSeek(&pPager->cpfd, 0);
  rc = sqliteOsFileSize(&pPager->cpfd, &nRec);
................................................................................
  for(i=nRec-1; i>=0; i--){
    rc = pager_playback_one_page(pPager, &pPager->jfd);
    if( rc!=SQLITE_OK ) goto end_ckpt_playback;
  }
  

end_ckpt_playback:


  if( rc!=SQLITE_OK ){

    pPager->errMask |= PAGER_ERR_CORRUPT;
    rc = SQLITE_CORRUPT;


  }
  return rc;
}

/*
** Change the maximum number of in-memory pages that are allowed.
*/
................................................................................
** and their memory is freed.  Any attempt to use a page associated
** with this page cache after this function returns will likely
** result in a coredump.
*/
int sqlitepager_close(Pager *pPager){
  PgHdr *pPg, *pNext;
  switch( pPager->state ){

    case SQLITE_WRITELOCK: {
      sqlitepager_rollback(pPager);
      sqliteOsUnlock(&pPager->fd);
      assert( pPager->journalOpen==0 );
      break;
    }
    case SQLITE_READLOCK: {
................................................................................
    }
    pPg->pgno = pgno;
    if( pPager->aInJournal && (int)pgno<=pPager->origDbSize ){
      pPg->inJournal = (pPager->aInJournal[pgno/8] & (1<<(pgno&7)))!=0;
    }else{
      pPg->inJournal = 0;
    }
    if( pPager->aInCkpt && (int)pgno<=pPager->ckptSize ){
      pPg->inCkpt = (pPager->aInCkpt[pgno/8] & (1<<(pgno&7)))!=0;
    }else{
      pPg->inCkpt = 0;
    }
    pPg->dirty = 0;
    pPg->nRef = 1;
    REFINFO(pPg);
................................................................................
      pPg->inCkpt = 1;
    }
  }

  /* If the checkpoint journal is open and the page is not in it,
  ** then write the current page to the checkpoint journal.
  */
  if( pPager->ckptOpen && !pPg->inCkpt && (int)pPg->pgno<=pPager->ckptSize ){

    assert( pPg->inJournal );
    rc = sqliteOsWrite(&pPager->cpfd, &pPg->pgno, sizeof(Pgno));
    if( rc==SQLITE_OK ){
      rc = sqliteOsWrite(&pPager->cpfd, pData, SQLITE_PAGE_SIZE);
    }
    if( rc!=SQLITE_OK ){
      sqlitepager_rollback(pPager);
................................................................................
  pPager->aInCkpt = sqliteMalloc( pPager->dbSize/8 + 1 );
  if( pPager->aInCkpt==0 ){
    sqliteOsReadLock(&pPager->fd);
    return SQLITE_NOMEM;
  }
  rc = sqliteOsFileSize(&pPager->jfd, &pPager->ckptJSize);
  if( rc ) goto ckpt_begin_failed;
  pPager->ckptSize = pPager->dbSize;
  rc = sqlitepager_opentemp(zTemp, &pPager->cpfd);
  if( rc ) goto ckpt_begin_failed;
  pPager->ckptOpen = 1;
  return SQLITE_OK;
 
ckpt_begin_failed:
  if( pPager->aInCkpt ){
................................................................................
  return rc;
}

/*
** Commit a checkpoint.
*/
int sqlitepager_ckpt_commit(Pager *pPager){
  if( pPager->ckptOpen ){
    PgHdr *pPg;
    sqliteOsClose(&pPager->cpfd);

    pPager->ckptOpen = 0;
    sqliteFree( pPager->aInCkpt );
    pPager->aInCkpt = 0;
    for(pPg=pPager->pAll; pPg; pPg=pPg->pNextAll){
      pPg->inCkpt = 0;
    }
  }
  return SQLITE_OK;
}

/*
** Rollback a checkpoint.
*/
int sqlitepager_ckpt_rollback(Pager *pPager){
  int rc;
  if( pPager->ckptOpen ){
    rc = pager_ckpt_playback(pPager);
    sqlitepager_ckpt_commit(pPager);
  }else{
    rc = SQLITE_OK;
  }
  return rc;
}

#if SQLITE_TEST
/*
** Print a listing of all referenced pages and their ref count.
*/

Changes to src/sqliteInt.h.

7
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12
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15
16
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...
561
562
563
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568
**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.83 2002/01/31 15:54:22 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
#include <stdio.h>
................................................................................
char *sqlite_mprintf(const char *, ...);
int sqliteExprIsConstant(Expr*);
void sqliteGenerateRowDelete(Vdbe*, Table*, int);
void sqliteGenerateRowIndexDelete(Vdbe*, Table*, int, char*);
void sqliteGenerateConstraintChecks(Parse*,Table*,int,char*,int,int,int,int);
void sqliteCompleteInsertion(Parse*, Table*, int, char*, int, int);
void sqliteBeginWriteOperation(Parse*);

void sqliteEndWriteOperation(Parse*);







|







 







>

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14
15
16
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561
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569
**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.84 2002/02/02 18:49:21 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
#include <stdio.h>
................................................................................
char *sqlite_mprintf(const char *, ...);
int sqliteExprIsConstant(Expr*);
void sqliteGenerateRowDelete(Vdbe*, Table*, int);
void sqliteGenerateRowIndexDelete(Vdbe*, Table*, int, char*);
void sqliteGenerateConstraintChecks(Parse*,Table*,int,char*,int,int,int,int);
void sqliteCompleteInsertion(Parse*, Table*, int, char*, int, int);
void sqliteBeginWriteOperation(Parse*);
void sqliteBeginMultiWriteOperation(Parse*);
void sqliteEndWriteOperation(Parse*);

Changes to src/update.c.

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
...
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.32 2002/01/31 15:54:22 drh Exp $
*/
#include "sqliteInt.h"

/*
** Process an UPDATE statement.
*/
void sqliteUpdate(
................................................................................
    }
  }

  /* Begin generating code.
  */
  v = sqliteGetVdbe(pParse);
  if( v==0 ) goto update_cleanup;
  sqliteBeginWriteOperation(pParse);

  /* Begin the database scan
  */
  pWInfo = sqliteWhereBegin(pParse, pTabList, pWhere, 1);
  if( pWInfo==0 ) goto update_cleanup;

  /* Remember the index of every item to be updated.







|







 







|







8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
...
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.33 2002/02/02 18:49:21 drh Exp $
*/
#include "sqliteInt.h"

/*
** Process an UPDATE statement.
*/
void sqliteUpdate(
................................................................................
    }
  }

  /* Begin generating code.
  */
  v = sqliteGetVdbe(pParse);
  if( v==0 ) goto update_cleanup;
  sqliteBeginMultiWriteOperation(pParse);

  /* Begin the database scan
  */
  pWInfo = sqliteWhereBegin(pParse, pTabList, pWhere, 1);
  if( pWInfo==0 ) goto update_cleanup;

  /* Remember the index of every item to be updated.

Changes to src/vdbe.c.

26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
...
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
....
1068
1069
1070
1071
1072
1073
1074
1075

1076
1077
1078
1079
1080
1081
1082
1083
....
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
....
2314
2315
2316
2317
2318
2319
2320















2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
....
2355
2356
2357
2358
2359
2360
2361

2362
2363
2364
2365
2366
2367
2368
....
4462
4463
4464
4465
4466
4467
4468
4469
4470









4471
4472
4473
4474
4475

4476















4477
4478
4479
4480
4481
4482
4483
** type to the other occurs as necessary.
** 
** Most of the code in this file is taken up by the sqliteVdbeExec()
** function which does the work of interpreting a VDBE program.
** But other routines are also provided to help in building up
** a program instruction by instruction.
**
** $Id: vdbe.c,v 1.113 2002/01/31 15:54:22 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** The following global variable is incremented every time a cursor
** moves, either by the OP_MoveTo or the OP_Next opcode.  The test
................................................................................
**
** If any of the numeric OP_ values for opcodes defined in sqliteVdbe.h
** change, be sure to change this array to match.  You can use the
** "opNames.awk" awk script which is part of the source tree to regenerate
** this array, then copy and paste it into this file, if you want.
*/
static char *zOpName[] = { 0,
  "Transaction",       "Commit",            "Rollback",          "ReadCookie",
  "SetCookie",         "VerifyCookie",      "Open",              "OpenTemp",
  "OpenWrite",         "OpenAux",           "OpenWrAux",         "Close",
  "MoveTo",            "NewRecno",          "PutIntKey",         "PutStrKey",
  "Distinct",          "Found",             "NotFound",          "IsUnique",
  "NotExists",         "Delete",            "Column",            "KeyAsData",
  "Recno",             "FullKey",           "Rewind",            "Next",
  "Destroy",           "Clear",             "CreateIndex",       "CreateTable",
  "Reorganize",        "IdxPut",            "IdxDelete",         "IdxRecno",
  "IdxGT",             "IdxGE",             "MemLoad",           "MemStore",
  "ListWrite",         "ListRewind",        "ListRead",          "ListReset",
  "SortPut",           "SortMakeRec",       "SortMakeKey",       "Sort",
  "SortNext",          "SortCallback",      "SortReset",         "FileOpen",
  "FileRead",          "FileColumn",        "AggReset",          "AggFocus",
  "AggIncr",           "AggNext",           "AggSet",            "AggGet",
  "SetInsert",         "SetFound",          "SetNotFound",       "MakeRecord",
  "MakeKey",           "MakeIdxKey",        "IncrKey",           "Goto",
  "If",                "Halt",              "ColumnCount",       "ColumnName",
  "Callback",          "NullCallback",      "Integer",           "String",
  "Pop",               "Dup",               "Pull",              "Push",
  "MustBeInt",         "Add",               "AddImm",            "Subtract",
  "Multiply",          "Divide",            "Remainder",         "BitAnd",
  "BitOr",             "BitNot",            "ShiftLeft",         "ShiftRight",
  "AbsValue",          "Precision",         "Min",               "Max",
  "Like",              "Glob",              "Eq",                "Ne",
  "Lt",                "Le",                "Gt",                "Ge",
  "IsNull",            "NotNull",           "Negative",          "And",
  "Or",                "Not",               "Concat",            "Noop",
  "Strlen",            "Substr",            "Limit",           
};

/*
** Given the name of an opcode, return its number.  Return 0 if
** there is no match.
**
** This routine is used for testing and debugging.
................................................................................
  int pc;                    /* The program counter */
  Op *pOp;                   /* Current operation */
  int rc;                    /* Value to return */
  Btree *pBt = p->pBt;       /* The backend driver */
  sqlite *db = p->db;        /* The database */
  char **zStack;             /* Text stack */
  Stack *aStack;             /* Additional stack information */
  int rollbackOnError = 1;   /* Do a ROLLBACK if an error is encountered */

  char zBuf[100];            /* Space to sprintf() an integer */


  /* No instruction ever pushes more than a single element onto the
  ** stack.  And the stack never grows on successive executions of the
  ** same loop.  So the total number of instructions is an upper bound
  ** on the maximum stack depth required.
  **
................................................................................
** There is an implied "Halt 0 0 0" instruction inserted at the very end of
** every program.  So a jump past the last instruction of the program
** is the same as executing Halt.
*/
case OP_Halt: {
  if( pOp->p1!=SQLITE_OK ){
    rc = pOp->p1;
    rollbackOnError = pOp->p2!=OE_Fail;
    goto abort_due_to_error;
  }else{
    pc = p->nOp-1;
  }
  break;
}

................................................................................
    memcpy(zNew, zStack[tos], aStack[tos].n);
    zStack[tos] = zNew;
    aStack[tos].flags = STK_Str | STK_Dyn;
  }
  zStack[tos][aStack[tos].n-1]++;
  break;
}
















/* Opcode: Transaction * * *
**
** Begin a transaction.  The transaction ends when a Commit or Rollback
** opcode is encountered or whenever there is an execution error that causes
** a script to abort.  A transaction is not ended by a Halt.
**
** A write lock is obtained on the database file when a transaction is
** started.  No other process can read or write the file while the
** transaction is underway.  Starting a transaction also creates a
** rollback journal.
** A transaction must be started before any changes can be made to the
** database.
*/
case OP_Transaction: {
  int busy = 0;
  if( db->pBeTemp ){
    rc = sqliteBtreeBeginTrans(db->pBeTemp);
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
................................................................................
        break;
      }
      default: {
        goto abort_due_to_error;
      }
    }
  }while( busy );

  break;
}

/* Opcode: Commit * * *
**
** Cause all modifications to the database that have been made since the
** last Transaction to actually take effect.  No additional modifications
................................................................................
      fprintf(p->trace,"\n");
    }
#endif
  }

cleanup:
  Cleanup(p);
  if( rc!=SQLITE_OK && rollbackOnError ){
    closeAllCursors(p);









    sqliteBtreeRollback(pBt);
    if( db->pBeTemp ) sqliteBtreeRollback(db->pBeTemp);
    sqliteRollbackInternalChanges(db);
    db->flags &= ~SQLITE_InTrans;
    db->onError = OE_Default;

  }















  return rc;

  /* Jump to here if a malloc() fails.  It's hard to get a malloc()
  ** to fail on a modern VM computer, so this code is untested.
  */
no_mem:
  sqliteSetString(pzErrMsg, "out of memory", 0);







|







 







|
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>
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>




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<







 







>







 







|
|
>
>
>
>
>
>
>
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>
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>
|
>
>
>
>
>
>
>
>
>
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>
>
>
>
>







26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
...
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
....
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
....
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
....
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348

2349
2350
2351
2352
2353
2354
2355
....
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
....
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
** type to the other occurs as necessary.
** 
** Most of the code in this file is taken up by the sqliteVdbeExec()
** function which does the work of interpreting a VDBE program.
** But other routines are also provided to help in building up
** a program instruction by instruction.
**
** $Id: vdbe.c,v 1.114 2002/02/02 18:49:21 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** The following global variable is incremented every time a cursor
** moves, either by the OP_MoveTo or the OP_Next opcode.  The test
................................................................................
**
** If any of the numeric OP_ values for opcodes defined in sqliteVdbe.h
** change, be sure to change this array to match.  You can use the
** "opNames.awk" awk script which is part of the source tree to regenerate
** this array, then copy and paste it into this file, if you want.
*/
static char *zOpName[] = { 0,
  "Transaction",       "Checkpoint",        "Commit",            "Rollback",
  "ReadCookie",        "SetCookie",         "VerifyCookie",      "Open",
  "OpenTemp",          "OpenWrite",         "OpenAux",           "OpenWrAux",
  "Close",             "MoveTo",            "NewRecno",          "PutIntKey",
  "PutStrKey",         "Distinct",          "Found",             "NotFound",
  "IsUnique",          "NotExists",         "Delete",            "Column",
  "KeyAsData",         "Recno",             "FullKey",           "Rewind",
  "Next",              "Destroy",           "Clear",             "CreateIndex",
  "CreateTable",       "Reorganize",        "IdxPut",            "IdxDelete",
  "IdxRecno",          "IdxGT",             "IdxGE",             "MemLoad",
  "MemStore",          "ListWrite",         "ListRewind",        "ListRead",
  "ListReset",         "SortPut",           "SortMakeRec",       "SortMakeKey",
  "Sort",              "SortNext",          "SortCallback",      "SortReset",
  "FileOpen",          "FileRead",          "FileColumn",        "AggReset",
  "AggFocus",          "AggIncr",           "AggNext",           "AggSet",
  "AggGet",            "SetInsert",         "SetFound",          "SetNotFound",
  "MakeRecord",        "MakeKey",           "MakeIdxKey",        "IncrKey",
  "Goto",              "If",                "Halt",              "ColumnCount",
  "ColumnName",        "Callback",          "NullCallback",      "Integer",
  "String",            "Pop",               "Dup",               "Pull",
  "Push",              "MustBeInt",         "Add",               "AddImm",
  "Subtract",          "Multiply",          "Divide",            "Remainder",
  "BitAnd",            "BitOr",             "BitNot",            "ShiftLeft",
  "ShiftRight",        "AbsValue",          "Precision",         "Min",
  "Max",               "Like",              "Glob",              "Eq",
  "Ne",                "Lt",                "Le",                "Gt",
  "Ge",                "IsNull",            "NotNull",           "Negative",
  "And",               "Or",                "Not",               "Concat",
  "Noop",              "Strlen",            "Substr",            "Limit",
};

/*
** Given the name of an opcode, return its number.  Return 0 if
** there is no match.
**
** This routine is used for testing and debugging.
................................................................................
  int pc;                    /* The program counter */
  Op *pOp;                   /* Current operation */
  int rc;                    /* Value to return */
  Btree *pBt = p->pBt;       /* The backend driver */
  sqlite *db = p->db;        /* The database */
  char **zStack;             /* Text stack */
  Stack *aStack;             /* Additional stack information */
  int errorAction = OE_Abort; /* Recovery action to do in case of an error */
  int undoTransOnError = 0;   /* If error, either ROLLBACK or COMMIT */
  char zBuf[100];             /* Space to sprintf() an integer */


  /* No instruction ever pushes more than a single element onto the
  ** stack.  And the stack never grows on successive executions of the
  ** same loop.  So the total number of instructions is an upper bound
  ** on the maximum stack depth required.
  **
................................................................................
** There is an implied "Halt 0 0 0" instruction inserted at the very end of
** every program.  So a jump past the last instruction of the program
** is the same as executing Halt.
*/
case OP_Halt: {
  if( pOp->p1!=SQLITE_OK ){
    rc = pOp->p1;
    errorAction = pOp->p2;
    goto abort_due_to_error;
  }else{
    pc = p->nOp-1;
  }
  break;
}

................................................................................
    memcpy(zNew, zStack[tos], aStack[tos].n);
    zStack[tos] = zNew;
    aStack[tos].flags = STK_Str | STK_Dyn;
  }
  zStack[tos][aStack[tos].n-1]++;
  break;
}

/* Opcode: Checkpoint * * *
**
** Begin a checkpoint.  A checkpoint is the beginning of a operation that
** is part of a larger transaction but which might need to be rolled back
** itself without effecting the containing transaction.  A checkpoint will
** be automatically committed or rollback when the VDBE halts.
*/
case OP_Checkpoint: {
  rc = sqliteBtreeBeginCkpt(pBt);
  if( rc==SQLITE_OK && db->pBeTemp ){
     rc = sqliteBtreeBeginCkpt(pBt);
  }
  break;
}

/* Opcode: Transaction * * *
**
** Begin a transaction.  The transaction ends when a Commit or Rollback
** opcode is encountered.  Depending on the ON CONFLICT setting, the
** transaction might also be rolled back if an error is encountered.
**
** A write lock is obtained on the database file when a transaction is
** started.  No other process can read or write the file while the
** transaction is underway.  Starting a transaction also creates a
** rollback journal.  A transaction must be started before any changes
** can be made to the database.

*/
case OP_Transaction: {
  int busy = 0;
  if( db->pBeTemp ){
    rc = sqliteBtreeBeginTrans(db->pBeTemp);
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
................................................................................
        break;
      }
      default: {
        goto abort_due_to_error;
      }
    }
  }while( busy );
  undoTransOnError = 1;
  break;
}

/* Opcode: Commit * * *
**
** Cause all modifications to the database that have been made since the
** last Transaction to actually take effect.  No additional modifications
................................................................................
      fprintf(p->trace,"\n");
    }
#endif
  }

cleanup:
  Cleanup(p);
  if( rc!=SQLITE_OK ){
    switch( errorAction ){
      case OE_Abort: {
        if( !undoTransOnError ){
          sqliteBtreeRollbackCkpt(pBt);
          if( db->pBeTemp ) sqliteBtreeRollbackCkpt(db->pBeTemp);
          break;
        }
        /* Fall through to ROLLBACK */
      }
      case OE_Rollback: {
        sqliteBtreeRollback(pBt);
        if( db->pBeTemp ) sqliteBtreeRollback(db->pBeTemp);
        sqliteRollbackInternalChanges(db);
        db->flags &= ~SQLITE_InTrans;
        db->onError = OE_Default;
        break;
      }
      default: {
        if( undoTransOnError ){
          sqliteBtreeCommit(pBt);
          if( db->pBeTemp ) sqliteBtreeCommit(db->pBeTemp);
          sqliteCommitInternalChanges(db);
          db->flags &= ~SQLITE_InTrans;
          db->onError = OE_Default;
        }
        break;
      }
    }
  }else{
    sqliteBtreeCommitCkpt(pBt);
    if( db->pBeTemp ) sqliteBtreeCommitCkpt(db->pBeTemp);
  }   
  return rc;

  /* Jump to here if a malloc() fails.  It's hard to get a malloc()
  ** to fail on a modern VM computer, so this code is untested.
  */
no_mem:
  sqliteSetString(pzErrMsg, "out of memory", 0);

Changes to src/vdbe.h.

11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
..
65
66
67
68
69
70
71

72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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101
102
103
104
105
106
107
108
109
110
111
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113
114
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121
122
123
124
125
126
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133
134
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136
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140
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143
144
145
146
147
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149
150
151
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153
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162
163
164
165
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172
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175
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177
178
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181
182
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185
186
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189
190
191
192
193
194
195
196
197
198
199
200
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202
203
204
205
206
207
208
209
210
211
*************************************************************************
** 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 1.39 2002/01/29 18:41:25 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
#include <stdio.h>

/*
** A single VDBE is an opaque structure named "Vdbe".  Only routines
................................................................................
** be sure to also update the zOpName[] array in sqliteVdbe.c to
** mirror the change.
**
** The source tree contains an AWK script named renumberOps.awk that
** can be used to renumber these opcodes when new opcodes are inserted.
*/
#define OP_Transaction         1

#define OP_Commit              2
#define OP_Rollback            3

#define OP_ReadCookie          4
#define OP_SetCookie           5
#define OP_VerifyCookie        6

#define OP_Open                7
#define OP_OpenTemp            8
#define OP_OpenWrite           9
#define OP_OpenAux            10
#define OP_OpenWrAux          11
#define OP_Close              12
#define OP_MoveTo             13
#define OP_NewRecno           14
#define OP_PutIntKey          15
#define OP_PutStrKey          16
#define OP_Distinct           17
#define OP_Found              18
#define OP_NotFound           19
#define OP_IsUnique           20
#define OP_NotExists          21
#define OP_Delete             22
#define OP_Column             23
#define OP_KeyAsData          24
#define OP_Recno              25
#define OP_FullKey            26
#define OP_Rewind             27
#define OP_Next               28

#define OP_Destroy            29
#define OP_Clear              30
#define OP_CreateIndex        31
#define OP_CreateTable        32
#define OP_Reorganize         33

#define OP_IdxPut             34
#define OP_IdxDelete          35
#define OP_IdxRecno           36
#define OP_IdxGT              37
#define OP_IdxGE              38

#define OP_MemLoad            39
#define OP_MemStore           40

#define OP_ListWrite          41
#define OP_ListRewind         42
#define OP_ListRead           43
#define OP_ListReset          44

#define OP_SortPut            45
#define OP_SortMakeRec        46
#define OP_SortMakeKey        47
#define OP_Sort               48
#define OP_SortNext           49
#define OP_SortCallback       50
#define OP_SortReset          51

#define OP_FileOpen           52
#define OP_FileRead           53
#define OP_FileColumn         54

#define OP_AggReset           55
#define OP_AggFocus           56
#define OP_AggIncr            57
#define OP_AggNext            58
#define OP_AggSet             59
#define OP_AggGet             60

#define OP_SetInsert          61
#define OP_SetFound           62
#define OP_SetNotFound        63

#define OP_MakeRecord         64
#define OP_MakeKey            65
#define OP_MakeIdxKey         66
#define OP_IncrKey            67

#define OP_Goto               68
#define OP_If                 69
#define OP_Halt               70

#define OP_ColumnCount        71
#define OP_ColumnName         72
#define OP_Callback           73
#define OP_NullCallback       74

#define OP_Integer            75
#define OP_String             76
#define OP_Pop                77
#define OP_Dup                78
#define OP_Pull               79
#define OP_Push               80
#define OP_MustBeInt          81

#define OP_Add                82
#define OP_AddImm             83
#define OP_Subtract           84
#define OP_Multiply           85
#define OP_Divide             86
#define OP_Remainder          87
#define OP_BitAnd             88
#define OP_BitOr              89
#define OP_BitNot             90
#define OP_ShiftLeft          91
#define OP_ShiftRight         92
#define OP_AbsValue           93
#define OP_Precision          94
#define OP_Min                95
#define OP_Max                96
#define OP_Like               97
#define OP_Glob               98
#define OP_Eq                 99
#define OP_Ne                100
#define OP_Lt                101
#define OP_Le                102
#define OP_Gt                103
#define OP_Ge                104
#define OP_IsNull            105
#define OP_NotNull           106
#define OP_Negative          107
#define OP_And               108
#define OP_Or                109
#define OP_Not               110
#define OP_Concat            111
#define OP_Noop              112

#define OP_Strlen            113
#define OP_Substr            114

#define OP_Limit             115

#define OP_MAX               115

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
*/
Vdbe *sqliteVdbeCreate(sqlite*);
void sqliteVdbeCreateCallback(Vdbe*, int*);







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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 1.40 2002/02/02 18:49:21 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
#include <stdio.h>

/*
** A single VDBE is an opaque structure named "Vdbe".  Only routines
................................................................................
** be sure to also update the zOpName[] array in sqliteVdbe.c to
** mirror the change.
**
** The source tree contains an AWK script named renumberOps.awk that
** can be used to renumber these opcodes when new opcodes are inserted.
*/
#define OP_Transaction         1
#define OP_Checkpoint          2
#define OP_Commit              3
#define OP_Rollback            4

#define OP_ReadCookie          5
#define OP_SetCookie           6
#define OP_VerifyCookie        7

#define OP_Open                8
#define OP_OpenTemp            9
#define OP_OpenWrite          10
#define OP_OpenAux            11
#define OP_OpenWrAux          12
#define OP_Close              13
#define OP_MoveTo             14
#define OP_NewRecno           15
#define OP_PutIntKey          16
#define OP_PutStrKey          17
#define OP_Distinct           18
#define OP_Found              19
#define OP_NotFound           20
#define OP_IsUnique           21
#define OP_NotExists          22
#define OP_Delete             23
#define OP_Column             24
#define OP_KeyAsData          25
#define OP_Recno              26
#define OP_FullKey            27
#define OP_Rewind             28
#define OP_Next               29

#define OP_Destroy            30
#define OP_Clear              31
#define OP_CreateIndex        32
#define OP_CreateTable        33
#define OP_Reorganize         34

#define OP_IdxPut             35
#define OP_IdxDelete          36
#define OP_IdxRecno           37
#define OP_IdxGT              38
#define OP_IdxGE              39

#define OP_MemLoad            40
#define OP_MemStore           41

#define OP_ListWrite          42
#define OP_ListRewind         43
#define OP_ListRead           44
#define OP_ListReset          45

#define OP_SortPut            46
#define OP_SortMakeRec        47
#define OP_SortMakeKey        48
#define OP_Sort               49
#define OP_SortNext           50
#define OP_SortCallback       51
#define OP_SortReset          52

#define OP_FileOpen           53
#define OP_FileRead           54
#define OP_FileColumn         55

#define OP_AggReset           56
#define OP_AggFocus           57
#define OP_AggIncr            58
#define OP_AggNext            59
#define OP_AggSet             60
#define OP_AggGet             61

#define OP_SetInsert          62
#define OP_SetFound           63
#define OP_SetNotFound        64

#define OP_MakeRecord         65
#define OP_MakeKey            66
#define OP_MakeIdxKey         67
#define OP_IncrKey            68

#define OP_Goto               69
#define OP_If                 70
#define OP_Halt               71

#define OP_ColumnCount        72
#define OP_ColumnName         73
#define OP_Callback           74
#define OP_NullCallback       75

#define OP_Integer            76
#define OP_String             77
#define OP_Pop                78
#define OP_Dup                79
#define OP_Pull               80
#define OP_Push               81
#define OP_MustBeInt          82

#define OP_Add                83
#define OP_AddImm             84
#define OP_Subtract           85
#define OP_Multiply           86
#define OP_Divide             87
#define OP_Remainder          88
#define OP_BitAnd             89
#define OP_BitOr              90
#define OP_BitNot             91
#define OP_ShiftLeft          92
#define OP_ShiftRight         93
#define OP_AbsValue           94
#define OP_Precision          95
#define OP_Min                96
#define OP_Max                97
#define OP_Like               98
#define OP_Glob               99
#define OP_Eq                100
#define OP_Ne                101
#define OP_Lt                102
#define OP_Le                103
#define OP_Gt                104
#define OP_Ge                105
#define OP_IsNull            106
#define OP_NotNull           107
#define OP_Negative          108
#define OP_And               109
#define OP_Or                110
#define OP_Not               111
#define OP_Concat            112
#define OP_Noop              113

#define OP_Strlen            114
#define OP_Substr            115

#define OP_Limit             116

#define OP_MAX               116

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
*/
Vdbe *sqliteVdbeCreate(sqlite*);
void sqliteVdbeCreateCallback(Vdbe*, int*);

Changes to test/pager.test.

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#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is page cache subsystem.
#
# $Id: pager.test,v 1.10 2001/09/16 00:13:28 drh Exp $


set testdir [file dirname $argv0]
source $testdir/tester.tcl

if {[info commands pager_open]!=""} {

................................................................................
  } $i body;
  do_test pager-3.7.$i.3 $body {1}
}
do_test pager-3.99 {
  pager_close $::p1
} {}































































































































































} ;# end if( not mem: and has pager_open command );

finish_test







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#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is page cache subsystem.
#
# $Id: pager.test,v 1.11 2002/02/02 18:49:21 drh Exp $


set testdir [file dirname $argv0]
source $testdir/tester.tcl

if {[info commands pager_open]!=""} {

................................................................................
  } $i body;
  do_test pager-3.7.$i.3 $body {1}
}
do_test pager-3.99 {
  pager_close $::p1
} {}

# tests of the checkpoint mechanism and api
#
do_test pager-4.0 {
  set v [catch {
    file delete -force ptf1.db
    set ::p1 [pager_open ptf1.db 15]
  } msg]
  if {$v} {lappend v $msg}
  set v
} {0}
do_test pager-4.1 {
  set g1 [page_get $::p1 1]
  page_write $g1 "Page-1 v0"
  for {set i 2} {$i<=20} {incr i} {
    set gx [page_get $::p1 $i]
    page_write $gx "Page-$i v0"
    page_unref $gx
  }
  pager_commit $::p1
} {}
for {set i 1} {$i<=20} {incr i} {
  do_test pager-4.2.$i {
    set gx [page_get $p1 $i]
    set v [page_read $gx]
    page_unref $gx
    set v
  } "Page-$i v0"
}
do_test pager-4.3 {
  lrange [pager_stats $::p1] 0 1
} {ref 1}
do_test pager-4.4 {
  lrange [pager_stats $::p1] 8 9
} {state 1}

for {set i 1} {$i<20} {incr i} {
  do_test pager-4.5.$i.0 {
    set res {}
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      set value [page_read $gx]
      page_unref $gx
      set shouldbe "Page-$j v[expr {$i-1}]"
      if {$value!=$shouldbe} {
        lappend res $value $shouldbe
      }
    }
    set res
  } {}
  do_test pager-4.5.$i.1 {
    page_write $g1 "Page-1 v$i"
    lrange [pager_stats $p1] 8 9
  } {state 2}
  do_test pager-4.5.$i.2 {
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      page_write $gx "Page-$j v$i"
      page_unref $gx
      if {$j==$i} {
        pager_ckpt_begin $p1
      }
    }
  } {}
  do_test pager-4.5.$i.3 {
    set res {}
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      set value [page_read $gx]
      page_unref $gx
      set shouldbe "Page-$j v$i"
      if {$value!=$shouldbe} {
        lappend res $value $shouldbe
      }
    }
    set res
  } {}
  do_test pager-4.5.$i.4 {
    pager_rollback $p1
    set res {}
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      set value [page_read $gx]
      page_unref $gx
      set shouldbe "Page-$j v[expr {$i-1}]"
      if {$value!=$shouldbe} {
        lappend res $value $shouldbe
      }
    }
    set res
  } {}
  do_test pager-4.5.$i.5 {
    page_write $g1 "Page-1 v$i"
    lrange [pager_stats $p1] 8 9
  } {state 2}
  do_test pager-4.5.$i.6 {
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      page_write $gx "Page-$j v$i"
      page_unref $gx
      if {$j==$i} {
        pager_ckpt_begin $p1
      }
    }
  } {}
  do_test pager-4.5.$i.7 {
    pager_ckpt_rollback $p1
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      set value [page_read $gx]
      page_unref $gx
      if {$j<=$i || $i==1} {
        set shouldbe "Page-$j v$i"
      } else {
        set shouldbe "Page-$j v[expr {$i-1}]"
      }
      if {$value!=$shouldbe} {
        lappend res $value $shouldbe
      }
    }
    set res
  } {}
  do_test pager-4.5.$i.8 {
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      page_write $gx "Page-$j v$i"
      page_unref $gx
      if {$j==$i} {
        pager_ckpt_begin $p1
      }
    }
  } {}
  do_test pager-4.5.$i.9 {
    pager_ckpt_commit $p1
    for {set j 2} {$j<=20} {incr j} {
      set gx [page_get $p1 $j]
      set value [page_read $gx]
      page_unref $gx
      set shouldbe "Page-$j v$i"
      if {$value!=$shouldbe} {
        lappend res $value $shouldbe
      }
    }
    set res
  } {}
  do_test pager-4.5.$i.10 {
    pager_commit $p1
    lrange [pager_stats $p1] 8 9
  } {state 1}
}

do_test pager-4.99 {
  pager_close $::p1
} {}



  file delete -force ptf1.db

} ;# end if( not mem: and has pager_open command );

finish_test