HERE
sopno finish = HERE();
sopno ret = HERE();
sn = HERE();
assert(HERE() == sn+1);
(HERE()-pos-1)*sizeof (sop));
#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos)
#define AHEAD(pos) dofwd(p, pos, HERE()-(pos))
#define ASTERN(sop, pos) EMIT(sop, HERE()-pos)
pos = HERE();
p->pbegin[subno] = HERE();
p->pend[subno] = HERE();
bc->fwd = HERE();
bc.start = HERE();
(void) REQUIRE(HERE() != bc.start, REG_BADPAT);
pos = HERE(); /* repetition op, if any, covers from here */
p->pbegin[subno] = HERE();
p->pend[subno] = HERE();