Here are the data structures with brief descriptions:

Ct_basicBlock
Ct_bbNode
Ct_cfg
Ct_cfgReg
Ct_fileLocation	Structure that represents a location in a file
Ct_ifStmt
Ct_instrArg
Ct_instruction
Ct_label
Ct_listNode	A node belonging a list
Ct_liveInterval	Structure describing a live interval of a register in a program
Ct_program
Ct_regAllocator	Structure encapsulating the state of the register allocator
Ct_spillInstrArgState
Ct_spillLocation
Ct_spillRegState	Structure representing the current state of a spill-reserved register
Ct_spillState	Spill register slots state
Ct_symbol
Ct_whileStmt