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Annotation of 3BSD/cmd/mip/convert, revision 1.1.1.1

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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