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Annotation of coherent/a/usr/man/ALL/c_language, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: C language                   Overview                  C language
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        !             8: The following summarizes how COHERENT implements the C language.
        !             9: 
        !            10: Identifiers
        !            11:     Characters allowed: AA-ZZ, aa-zz, _, 00-99
        !            12:     Case sensitive.
        !            13:     Number of significant characters in a variable name:
        !            14:         at compile time:112288
        !            15:         at link time:1166
        !            16:     C appends `_' to end of external identifiers
        !            17: 
        !            18: Reserved Identifiers (Keywords)
        !            19:     See CC kkeeyywwoorrddss, above.
        !            20: 
        !            21: Data Formats (bits)
        !            22:     cchhaarr           8
        !            23:     uunnssiiggnneedd cchhaarr  8
        !            24:     ddoouubbllee        64
        !            25:     ffllooaatt         32
        !            26:     iinntt           16
        !            27:     uunnssiiggnneedd iinntt  16
        !            28:     lloonngg          32
        !            29:     uunnssiiggnneedd lloonngg 32
        !            30:     pointer       16
        !            31: 
        !            32: Limits
        !            33:     Maximum bitfield size:  16 bits
        !            34:     Maximum number of ccaassees in a sswwiittcchh:  no formal limit
        !            35:     Maximum block nesting depth:  no formal limit
        !            36:     Maximum parentheses nesting depth:  no formal limit
        !            37:     Maximum structure size:  64 kilobytes
        !            38: 
        !            39: Preprocessor Instructions:
        !            40:     #define #ifdef
        !            41:     #else   #ifndef
        !            42:     #elif   #include
        !            43:     #endif  #line
        !            44:     #if     #undef
        !            45: 
        !            46: Structure Name-Spaces
        !            47:     Supports both Berkeley and Kernighan-Ritchie conventions
        !            48:     for structure in union.
        !            49: 
        !            50: Register Variables
        !            51:     Two available for iinntts
        !            52:     Two available for pointers
        !            53: 
        !            54: Function Linkage
        !            55:     Return values for iinntts: AX
        !            56:     Return values for lloonnggs: DX:AX
        !            57:     Return values for SMALL-model pointers: AX
        !            58:     Return values for LARGE-model pointers: DX:AX
        !            59:     Return values for ddoouubbllees in DX:AX
        !            60:     Parameters pushed on stack in reverse order, cchhaarrs and sshhoorrtts pushed
        !            61:        as words, lloonnggs and pointers pushed as lloonnggs, structures
        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: C language                   Overview                  C language
        !            70: 
        !            71: 
        !            72: 
        !            73:        copied onto stack
        !            74:     Caller must clear parameters off stack
        !            75:     Stack frame linkage is done through SP register
        !            76: 
        !            77: ***** Special Features and Optimizations *****
        !            78: 
        !            79: 
        !            80: * Branch optimization is performed: this uses the smallest branch
        !            81:   instruction for the required range.
        !            82: 
        !            83: * Unreached code is eliminated.
        !            84: 
        !            85: * Duplicate instruction sequences are removed.
        !            86: 
        !            87: * Jumps to jumps are eliminated.
        !            88: 
        !            89: *  Multiplication and  division  by constant  powers  of two  are
        !            90:   changed to shifts when the results are the same.
        !            91: 
        !            92: * Sequences  that can be resolved at  compile time are identified
        !            93:   and resolved.
        !            94: 
        !            95: ***** See Also *****
        !            96: 
        !            97: argc, argv,  C keywords,  C preprocessor, header  files, Lexicon,
        !            98: libraries, linker-defined symbols, main()
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        !           130: COHERENT Lexicon                                           Page 2
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