void pc_add_expr(struct expr *pc)
{
struct expr *old_pc1;
if(s_pc1 != unset_value)
{
old_pc1 = s_pc1;
s_pc1 = pc;
if(old_pc1 != NULL)
{
s_pc1 = new_expr_op2(PLUS, s_pc1, old_pc1);
}
}
}
struct expr *pc_get()
{
struct expr *old_pc1;
if(s_pc1 == unset_value)
{
LOG(LOG_ERROR, ("PC must be set by a .org(pc) call.\n"));
exit(-1);
}
if(s_pc1 == NULL || s_pc2 != 0)
{
old_pc1 = s_pc1;
s_pc1 = new_expr_number(s_pc2);
s_pc2 = 0;
if(old_pc1 != NULL)
{
s_pc1 = new_expr_op2(PLUS, s_pc1, old_pc1);
}
}
return s_pc1;
}
struct atom *new_op(u8 op_code, u8 atom_op_type,
struct expr *op_arg)
{
struct atom *atom;
atom = chunkpool_malloc(s->atom_pool);
atom->type = atom_op_type;
atom->u.op.code = op_code;
atom->u.op.arg = op_arg;
switch(atom_op_type)
{
case ATOM_TYPE_OP_ARG_NONE:
pc_add(1);
break;
case ATOM_TYPE_OP_ARG_U8:
pc_add(2);
break;
case ATOM_TYPE_OP_ARG_U16:
pc_add(3);
break;
case ATOM_TYPE_OP_ARG_I8:
pc_add(2);
atom->u.op.arg = new_expr_op2(MINUS, atom->u.op.arg, pc_get());
break;
case ATOM_TYPE_OP_ARG_UI8:
pc_add(2);
break;
default:
LOG(LOG_ERROR, ("invalid op arg range %d\n", atom_op_type));
exit(1);
}
pc_dump(LOG_DEBUG);
return atom;
}