in src/pg_query_parse_plpgsql.c [27:56]
static void add_dummy_return(PLpgSQL_function *function)
{
/*
* If the outer block has an EXCEPTION clause, we need to make a new outer
* block, since the added RETURN shouldn't act like it is inside the
* EXCEPTION clause.
*/
if (function->action->exceptions != NULL)
{
PLpgSQL_stmt_block *new;
new = palloc0(sizeof(PLpgSQL_stmt_block));
new->cmd_type = PLPGSQL_STMT_BLOCK;
new->body = list_make1(function->action);
function->action = new;
}
if (function->action->body == NIL ||
((PLpgSQL_stmt *) llast(function->action->body))->cmd_type != PLPGSQL_STMT_RETURN)
{
PLpgSQL_stmt_return *new;
new = palloc0(sizeof(PLpgSQL_stmt_return));
new->cmd_type = PLPGSQL_STMT_RETURN;
new->expr = NULL;
new->retvarno = function->out_param_varno;
function->action->body = lappend(function->action->body, new);
}
}