COMPILE_STACK_TOP
COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer;
COMPILE_STACK_TOP.fixup_alt_jump
COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer;
COMPILE_STACK_TOP.regnum = regnum;
COMPILE_STACK_TOP.inner_group_offset = b - bufp->buffer + 2;
begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset;
= COMPILE_STACK_TOP.fixup_alt_jump
? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1
laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset;
this_group_regnum = COMPILE_STACK_TOP.regnum;
= bufp->buffer + COMPILE_STACK_TOP.inner_group_offset;