Llvm.MemoryBufferSourceof_file p is the memory buffer containing the contents of the file at path p. If the file could not be read, then IoError msg is raised.
of_stdin () is the memory buffer containing the contents of standard input. If standard input is empty, then IoError msg is raised.
of_string ~name s is the memory buffer containing the contents of string s. The name of memory buffer is set to name if it is provided.
as_string mb is the string containing the contents of memory buffer mb.
Disposes of a memory buffer.