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2.18.1 Creating and freeing a hash table
To create a hash table, create an instance of a struct bfd_hash_table (defined in bfd.h) and call bfd_hash_table_init (if you know approximately how many entries you will need, the function bfd_hash_table_init_n, which takes a size argument, may be used). bfd_hash_table_init returns FALSE if some sort of error occurs.
The function bfd_hash_table_init take as an argument a function to use to create new entries. For a basic hash table, use the function bfd_hash_newfunc. See Deriving a New Hash Table Type, for why you would want to use a different value for this argument.
bfd_hash_table_init will create an objalloc which will be used to allocate new entries. You may allocate memory on this objalloc using bfd_hash_allocate.
Use bfd_hash_table_free to free up all the memory that has been allocated for a hash table. This will not free up the struct bfd_hash_table itself, which you must provide.
Use bfd_hash_set_default_size to set the default size of hash table to use.