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Add the new OP_BeginSubrtn opcode (which is really an alias for OP_Integer)

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and make other changes so that the span of a subroutine that implements
a subquery is more readily apparent in bytecode listings.

FossilOrigin-Name: b8226748709de37cfc86414714c20567254e5b320b380e767c322dba69a79d49
This commit is contained in:
drh
2022-03-03 15:00:44 +00:00
parent 5694569591
commit 1902516d16
4 changed files with 35 additions and 16 deletions
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17
src/vdbe.c
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@@ -991,10 +991,14 @@ jump_to_p2:
break;
}
/* Opcode: Return P1 * * * *
/* Opcode: Return P1 * P3 * *
**
** Jump to the next instruction after the address in register P1. After
** the jump, register P1 becomes undefined.
**
** P3 is not used by the byte-code engine. However, the code generator
** sets P3 to address of the associated OP_BeginSubrtn opcode, if there is
** one.
*/
case OP_Return: { /* in1 */
pIn1 = &aMem[pOp->p1];
@@ -1182,11 +1186,22 @@ case OP_Halt: {
goto vdbe_return;
}
/* Opcode: BeginSubrtn P1 P2 * * *
** Synopsis: r[P2]=P1
**
** Mark the beginning of a subroutine by loading the integer value P1
** into register r[P2]. The P2 register is used to store the return
** address of the subroutine call.
**
** This opcode is identical to OP_Integer. It has a different name
** only to make the byte code easier to read and verify.
*/
/* Opcode: Integer P1 P2 * * *
** Synopsis: r[P2]=P1
**
** The 32-bit integer value P1 is written into register P2.
*/
case OP_BeginSubrtn:
case OP_Integer: { /* out2 */
pOut = out2Prerelease(p, pOp);
pOut->u.i = pOp->p1;