diff options
Diffstat (limited to 'src/vdbe.c')
| -rw-r--r-- | src/vdbe.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/vdbe.c b/src/vdbe.c index 906058c1f..4f7fd6bbe 100644 --- a/src/vdbe.c +++ b/src/vdbe.c @@ -2021,6 +2021,16 @@ case OP_BitNot: { /* same as TK_BITNOT, in1, out2 */ break; } +/* Opcode: Once P1 P2 * * * +** +** Jump to P2 if the value in register P1 is a not null or zero. If +** the value is NULL or zero, fall through and change the P1 register +** to an integer 1. +** +** When P1 is not used otherwise in a program, this opcode falls through +** once and jumps on all subsequent invocations. It is the equivalent +** of "OP_If P1 P2", followed by "OP_Integer 1 P1". +*/ /* Opcode: If P1 P2 P3 * * ** ** Jump to P2 if the value in register P1 is true. The value @@ -2033,6 +2043,7 @@ case OP_BitNot: { /* same as TK_BITNOT, in1, out2 */ ** is considered true if it has a numeric value of zero. If the value ** in P1 is NULL then take the jump if P3 is true. */ +case OP_Once: /* jump, in1 */ case OP_If: /* jump, in1 */ case OP_IfNot: { /* jump, in1 */ int c; @@ -2049,6 +2060,12 @@ case OP_IfNot: { /* jump, in1 */ } if( c ){ pc = pOp->p2-1; + }else if( pOp->opcode==OP_Once ){ + assert( (pIn1->flags & (MEM_Agg|MEM_Dyn|MEM_RowSet|MEM_Frame))==0 ); + memAboutToChange(p, pIn1); + pIn1->flags = MEM_Int; + pIn1->u.i = 1; + REGISTER_TRACE(pOp->p1, pIn1); } break; } |