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Overview
Comment:Further improvements to bytecode branch testing. Fix cases where the macros said a branch could not be taken when in fact it could be. Alter some window function branch coverage macros to indicate that comparison operands cannot be NULL.
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SHA3-256: 76e42b7071a71137c0da4f10db4e653ae94a89b56e95cd3f036bff08c9500d08
User & Date: drh 2018-07-10 17:10:44
Context
2018-07-10
17:26
Fix a problem with using scalar sub-selects in window function queries. check-in: 687fe532 user: dan tags: trunk
17:10
Further improvements to bytecode branch testing. Fix cases where the macros said a branch could not be taken when in fact it could be. Alter some window function branch coverage macros to indicate that comparison operands cannot be NULL. check-in: 76e42b70 user: drh tags: trunk
16:04
Enhancements and improved documentation to the byte-code branch coverage testing logic. Provide new macros that allow the code to specify that some branch instructions can never take the NULL path and that the OP_Jump opcode is only interested in equal/not-equal. The SQLITE_TESTCTRL_VDBE_COVERAGE file control callback now works slightly differently (it provides the callback with a bitmask of the branch action, rather than an integer). check-in: cd2da7e1 user: drh tags: trunk
Changes
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Changes to src/analyze.c. 

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      callStatGet(v, regStat4, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      VdbeCoverage(v);
      callStatGet(v, regStat4, STAT_GET_NEQ, regEq);
      callStatGet(v, regStat4, STAT_GET_NLT, regLt);
      callStatGet(v, regStat4, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);
      /* We know that the regSampleRowid row exists because it was read by
      ** the previous loop.  Thus the not-found jump of seekOp will never
      ** be taken */
      VdbeCoverageNeverTaken(v);
#ifdef SQLITE_ENABLE_STAT3
      sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, 0, regSample);
#else
      for(i=0; i<nCol; i++){
        sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, i, regCol+i);
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol, regSample);








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      callStatGet(v, regStat4, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      VdbeCoverage(v);
      callStatGet(v, regStat4, STAT_GET_NEQ, regEq);
      callStatGet(v, regStat4, STAT_GET_NLT, regLt);
      callStatGet(v, regStat4, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);



      VdbeCoverage(v);
#ifdef SQLITE_ENABLE_STAT3
      sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, 0, regSample);
#else
      for(i=0; i<nCol; i++){
        sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iTabCur, i, regCol+i);
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regCol, nCol, regSample);

Changes to src/update.c. 

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    }
  
    /* Top of the update loop */
    if( eOnePass!=ONEPASS_OFF ){
      if( !isView && aiCurOnePass[0]!=iDataCur && aiCurOnePass[1]!=iDataCur ){
        assert( pPk );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak, regKey,nKey);
        VdbeCoverageNeverTaken(v);
      }
      if( eOnePass!=ONEPASS_SINGLE ){
        labelContinue = sqlite3VdbeMakeLabel(v);
      }
      sqlite3VdbeAddOp2(v, OP_IsNull, pPk ? regKey : regOldRowid, labelBreak);
      VdbeCoverageIf(v, pPk==0);
      VdbeCoverageIf(v, pPk!=0);








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    }
  
    /* Top of the update loop */
    if( eOnePass!=ONEPASS_OFF ){
      if( !isView && aiCurOnePass[0]!=iDataCur && aiCurOnePass[1]!=iDataCur ){
        assert( pPk );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelBreak, regKey,nKey);
        VdbeCoverage(v);
      }
      if( eOnePass!=ONEPASS_SINGLE ){
        labelContinue = sqlite3VdbeMakeLabel(v);
      }
      sqlite3VdbeAddOp2(v, OP_IsNull, pPk ? regKey : regOldRowid, labelBreak);
      VdbeCoverageIf(v, pPk==0);
      VdbeCoverageIf(v, pPk!=0);

Changes to src/vdbe.c. 

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    mNever = iSrcLine >> 24;
    assert( (I & mNever)==0 );
    if( sqlite3GlobalConfig.xVdbeBranch==0 ) return;  /*NO_TEST*/
    I |= mNever;
    if( M==2 ) I |= 0x04;
    if( M==4 ){
      I |= 0x08;
      if( (I&0x05)!=0 ) I |= 0x05;
    }
    sqlite3GlobalConfig.xVdbeBranch(sqlite3GlobalConfig.pVdbeBranchArg,
                                    iSrcLine&0xffffff, I, M);
  }
#endif

/*








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    mNever = iSrcLine >> 24;
    assert( (I & mNever)==0 );
    if( sqlite3GlobalConfig.xVdbeBranch==0 ) return;  /*NO_TEST*/
    I |= mNever;
    if( M==2 ) I |= 0x04;
    if( M==4 ){
      I |= 0x08;
      if( (mNever&0x08)!=0 && (I&0x05)!=0) I |= 0x05; /*NO_TEST*/
    }
    sqlite3GlobalConfig.xVdbeBranch(sqlite3GlobalConfig.pVdbeBranchArg,
                                    iSrcLine&0xffffff, I, M);
  }
#endif

/*

Changes to src/vdbe.h. 

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# define VdbeCoverageIf(v,x) if(x)sqlite3VdbeSetLineNumber(v,__LINE__)
# define VdbeCoverageAlwaysTaken(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x5000000);
# define VdbeCoverageNeverTaken(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x6000000);
# define VdbeCoverageNeverNull(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);


# define VdbeCoverageEqNe(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x8000000);
# define VDBE_OFFSET_LINENO(x) (__LINE__+x)
#else
# define VdbeCoverage(v)
# define VdbeCoverageIf(v,x)
# define VdbeCoverageAlwaysTaken(v)
# define VdbeCoverageNeverTaken(v)
# define VdbeCoverageNeverNull(v)

# define VdbeCoverageEqNe(v)
# define VDBE_OFFSET_LINENO(x) 0
#endif

#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
void sqlite3VdbeScanStatus(Vdbe*, int, int, int, LogEst, const char*);
#else








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# define VdbeCoverageIf(v,x) if(x)sqlite3VdbeSetLineNumber(v,__LINE__)
# define VdbeCoverageAlwaysTaken(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x5000000);
# define VdbeCoverageNeverTaken(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x6000000);
# define VdbeCoverageNeverNull(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
# define VdbeCoverageNeverNullIf(v,x) \
         if(x)sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
# define VdbeCoverageEqNe(v) \
         sqlite3VdbeSetLineNumber(v,__LINE__|0x8000000);
# define VDBE_OFFSET_LINENO(x) (__LINE__+x)
#else
# define VdbeCoverage(v)
# define VdbeCoverageIf(v,x)
# define VdbeCoverageAlwaysTaken(v)
# define VdbeCoverageNeverTaken(v)
# define VdbeCoverageNeverNull(v)
# define VdbeCoverageNeverNullIf(v,x)
# define VdbeCoverageEqNe(v)
# define VDBE_OFFSET_LINENO(x) 0
#endif

#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
void sqlite3VdbeScanStatus(Vdbe*, int, int, int, LogEst, const char*);
#else

Changes to src/window.c. 

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  assert( eCond==0 || eCond==1 || eCond==2 );
  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
  sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
  VdbeCoverageIf(v, eCond==0);
  VdbeCoverageIf(v, eCond==1);
  VdbeCoverageIf(v, eCond==2);
  sqlite3VdbeAddOp3(v, aOp[eCond], regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
  VdbeCoverageIf(v, eCond==0);
  VdbeCoverageIf(v, eCond==1);
  VdbeCoverageIf(v, eCond==2);
  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
  sqlite3VdbeAppendP4(v, (void*)azErr[eCond], P4_STATIC);
  sqlite3ReleaseTempReg(pParse, regZero);
}

/*
** Return the number of arguments passed to the window-function associated
................................................................................
        sqlite3VdbeAddOp3(v, OP_Column, pMWin->iEphCsr, pWin->iArgCol+1,tmpReg);
        windowCheckIntValue(pParse, tmpReg, 2);
      }else{
        sqlite3VdbeAddOp2(v, OP_Integer, 1, tmpReg);
      }
      sqlite3VdbeAddOp3(v, OP_Add, tmpReg, pWin->regApp, tmpReg);
      sqlite3VdbeAddOp3(v, OP_Gt, pWin->regApp+1, lbl, tmpReg);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_SeekRowid, csr, lbl, tmpReg);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol, pWin->regResult);
      sqlite3VdbeResolveLabel(v, lbl);
      sqlite3ReleaseTempReg(pParse, tmpReg);
    }
    else if( pFunc->zName==leadName || pFunc->zName==lagName ){
................................................................................
  **   }
  **   regEnd = regEnd - regStart;
  */
  if( pMWin->pEnd && pMWin->eStart==TK_FOLLOWING ){
    assert( pMWin->pStart!=0 );
    assert( pMWin->eEnd==TK_FOLLOWING );
    sqlite3VdbeAddOp3(v, OP_Ge, regStart, sqlite3VdbeCurrentAddr(v)+2, regEnd);
    VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regStart);
    sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regEnd);
  }

  if( pMWin->pStart && pMWin->eEnd==TK_PRECEDING ){
    assert( pMWin->pEnd!=0 );
    assert( pMWin->eStart==TK_PRECEDING );
    sqlite3VdbeAddOp3(v, OP_Le, regStart, sqlite3VdbeCurrentAddr(v)+3, regEnd);
    VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regStart);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regEnd);
  }

  /* Initialize the accumulator register for each window function to NULL */
  regArg = windowInitAccum(pParse, pMWin);









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  assert( eCond==0 || eCond==1 || eCond==2 );
  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
  sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
  VdbeCoverageIf(v, eCond==0);
  VdbeCoverageIf(v, eCond==1);
  VdbeCoverageIf(v, eCond==2);
  sqlite3VdbeAddOp3(v, aOp[eCond], regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
  VdbeCoverageNeverNullIf(v, eCond==0);
  VdbeCoverageNeverNullIf(v, eCond==1);
  VdbeCoverageNeverNullIf(v, eCond==2);
  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
  sqlite3VdbeAppendP4(v, (void*)azErr[eCond], P4_STATIC);
  sqlite3ReleaseTempReg(pParse, regZero);
}

/*
** Return the number of arguments passed to the window-function associated
................................................................................
        sqlite3VdbeAddOp3(v, OP_Column, pMWin->iEphCsr, pWin->iArgCol+1,tmpReg);
        windowCheckIntValue(pParse, tmpReg, 2);
      }else{
        sqlite3VdbeAddOp2(v, OP_Integer, 1, tmpReg);
      }
      sqlite3VdbeAddOp3(v, OP_Add, tmpReg, pWin->regApp, tmpReg);
      sqlite3VdbeAddOp3(v, OP_Gt, pWin->regApp+1, lbl, tmpReg);
      VdbeCoverageNeverNull(v);
      sqlite3VdbeAddOp3(v, OP_SeekRowid, csr, lbl, tmpReg);
      VdbeCoverage(v);
      sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol, pWin->regResult);
      sqlite3VdbeResolveLabel(v, lbl);
      sqlite3ReleaseTempReg(pParse, tmpReg);
    }
    else if( pFunc->zName==leadName || pFunc->zName==lagName ){
................................................................................
  **   }
  **   regEnd = regEnd - regStart;
  */
  if( pMWin->pEnd && pMWin->eStart==TK_FOLLOWING ){
    assert( pMWin->pStart!=0 );
    assert( pMWin->eEnd==TK_FOLLOWING );
    sqlite3VdbeAddOp3(v, OP_Ge, regStart, sqlite3VdbeCurrentAddr(v)+2, regEnd);
    VdbeCoverageNeverNull(v);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regStart);
    sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regEnd);
  }

  if( pMWin->pStart && pMWin->eEnd==TK_PRECEDING ){
    assert( pMWin->pEnd!=0 );
    assert( pMWin->eStart==TK_PRECEDING );
    sqlite3VdbeAddOp3(v, OP_Le, regStart, sqlite3VdbeCurrentAddr(v)+3, regEnd);
    VdbeCoverageNeverNull(v);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regStart);
    sqlite3VdbeAddOp2(v, OP_Copy, regSize, regEnd);
  }

  /* Initialize the accumulator register for each window function to NULL */
  regArg = windowInitAccum(pParse, pMWin);

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