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Annotation of 3BSD/cmd/mip/convert, revision 1.1

1.1     ! root        1: To convert two pass to 1 pass operation:
        !             2: (I suggest that you use a subdirectory, since
        !             3: it is hard to repair some of this damage once done)
        !             4: 
        !             5: I assume that you have new copies of the machine-independent
        !             6: files.  The file cl is no longer used, and there is no
        !             7: use of lex at all.  The file scan.c contains the new
        !             8: lexical analyzer.  Moreover, the file comm2.c is no longer
        !             9: used when the passes are loaded together.
        !            10: These changes may affect local procedures for searching, printing,
        !            11: diffing, etc. the compiler.
        !            12: 
        !            13: I suggest that you take the makefile in /usr/n as well, to help you
        !            14: along.
        !            15: 
        !            16: The conversion process, as well as I understand it is as follows.
        !            17: 
        !            18: 1.  Make a subdirectory, and put in it the old machine dependent files
        !            19: macdefs, mac2defs, local.c, order.c, code.c, local2.c, and table.c.
        !            20: Put in all the new machine independent stuff, including the new makefile
        !            21: 
        !            22: 2.  Insert the line # define ONEPASS into macdefs
        !            23: Change LABFMT by deleting the \n.
        !            24: 
        !            25: 3.  In all the machine dependent source files local.c,
        !            26: code.c, order.c, local2.c, and table.c, remove the includes of
        !            27: manifest and macdefs; these are now included by mfile1 and mfile2.
        !            28: 
        !            29: 4.  The main routine for pass 2 (probably on local2.c)
        !            30: should be deleted; it probably only does a call to mainp2.
        !            31: If it does anything else of interest,
        !            32: let me know.
        !            33: 
        !            34: 5.  On the file local.c, in the routine `ecode',
        !            35: replace the lines
        !            36:      printf( ".%d\t%s\n", lineno, ftitle );
        !            37:      prtree( p );
        !            38: by
        !            39:      p2tree( p );
        !            40:      p2compile( p );
        !            41: 
        !            42: 6.  In code.c, in the function bccode, replace the line
        !            43:      printf( "[\t%d\t%d\t%d\t\n", ftnno, XXXX, YYYY );
        !            44: by
        !            45:      p2bbeg( XXXX, YYYY );
        !            46: Also, in efcode, replace the line which prints out the "]..."
        !            47: with
        !            48:      p2bend();
        !            49: 
        !            50: 7.  In code.c and local.c, look at all remaining printfs.  Lines
        !            51: which go onto the intermediate file all had ")" at the head.
        !            52: All of these must be clobbered.  Thus, a line which read
        !            53:      printf( ")    xxx yyy\n)   zzz  www\n" );
        !            54: must be changed to read
        !            55:      printf( "    xxx yyy\n   zzz  www\n" );
        !            56: This is tedious, although a few cleverly chosen ed commands
        !            57: will probably do the trick.
        !            58: 
        !            59: 8.  Say make, and stand back.  The result is a
        !            60: single program called comp.
        !            61: You may experience loading errors as a result of having used the
        !            62: same external names in the first and second pass.  Look at the
        !            63: beginning of mfile2 to get a hint about one way to deal with
        !            64: this problem (add stuff to mac2defs to change the names).
        !            65: The other way to deal with it is just fix it...
        !            66: 
        !            67: 9.  As a side-effect of other changes, the meaning of the arguments
        !            68: to match has changed slightly; ASG OPANY, as it always
        !            69: did, matches any assignment op except ++, --, and = itself.
        !            70: OPANY, on the other hand, matches only ops which are not assignment
        !            71: ops.  In table.c, there must be explicit rewriting rule entries for
        !            72: ++, --, and =.  In most cases with which I am familiar, this should
        !            73: be true already, and no change is needed.
        !            74: 
        !            75: 10. Usage is  /lib/cpp x.c | comp
        !            76: which produces assembler output on the std. output.
        !            77: research!/usr/bin/ncc gives the interdata compiler, with many
        !            78: bells and whistles, as a Bourne shell script.
        !            79: regression tests, and checks that this compiler
        !            80: produces the same output as the earlier one, are
        !            81: both wise.
        !            82: 
        !            83: Good Luck!

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