Here are the data structures with brief descriptions:

Cbfc_args_t	Parsed command-line state
Cbfc_asm	Mutable assembly-generation state shared by generic codegen and backends
Cbfc_backend_t	Immutable callback table implemented by one target backend
Cbfc_error_t	Error value propagated through compiler stages
Cbfc_ir_block	Owning, dynamically sized sequence of IR instructions
Cbfc_ir_instr_t	One IR instruction
Cbfc_ir_stack_t	Construction-only stack of currently active nested IR blocks
Cbfc_option_t	Metadata and behaviour for one command-line option
Cbfc_program_t	Owning representation of a loaded source file
Cbfc_target_entry_t	One accepted target-triple mapping
Cbfc_target_t	Architecture and operating-system pair used to select a backend
Cbfc_token_stream_t	Owning token sequence produced by the lexer
Cbfc_token_t	One Brainfuck token and its one-based source location