This paper describes the overall structure and function of the Plan 9 C compilers. A more detailed implementation document for any one of the compilers is yet to be written. There are currently six compilers in the series. Four of the compilers (MIPS 3000, SPARC, Intel 386, and Motorola 68020) are considered active and are used to compile current versions of Plan 9. The other two (AT&T 3210, Intel 960) have been used only to program peripherals. The compiler is a single program that produces an object file. Combined in the compiler are the traditional roles of preprocessor, lexical analyzer, parser, code generator, local optimizer, and first half of the assembler. The object files are binary forms of assembly language, similar to what might be passed between the first and second passes of an assembler.
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