path: root/contrib/gperf/ChangeLog

Sat Nov 11 13:43:17 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Modified options by changing macro TOTAL_POSITIONS to GET_CHARSET_SIZE
          and SET_CHARSET_SIZE.  These two routines now either return
          the total charset size *or* the length of the largest keyword
          if the user specifies the -k'*' (ALLCHARS) option.  This change
          cleans up client code.

Fri Nov 10 15:21:19 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Made sure to explicitly initialize perfect.fewest_collisions to
          0.

Wed Nov  1 21:39:54 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Upgraded the version number to 2.0, reflecting all the 
          major recent changes!

        * Rearranged code so that fewer source lines are greater than 80 columns. 

        * Cleaned up some loose ends noticed by Nels Olson.
          1.  Removed `if (collisions <= perfect.fewest_collisions)'
              from affects_prev () since it was superfluous.
          2.  Removed the fields best_char_value and best_asso_value
              from PERFECT.  There were also unnecessary.
          3.  Fixed a braino in boolarray.c's bool_array_reset ()
              function.  Since iteration numbers can never be zero
              the `if (bool_array.iteration_number++ == 0)' must be
              `if (++bool_array.iteration_number == 0).'
          4.  Broke the -h help options string into 3 pieces.  This
              should silence broken C compilers for a while!
          5.  Modified `report_error ()' so that it correctly handled
              "%%".

Tue Oct 31 23:01:11 1989  Doug Schmidt  (schmidt at siam.ics.uci.edu)

        * It is important to note that -D no longer enables -S.
          There is a good reason for this change, which will become
          manifested in the next release... (suspense!).

        * Made some subtle changes to print_switch so that if finally
          seems to work correctly.  Needs more stress testing, however...

Mon Oct 30 15:06:59 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Made a major change to the keylist.c's print_switch () function.
          The user can now specify the number of switch statements to generate
          via an argument to the -S option, i.e., -S1 means `generate 1
          switch statement with all keywords in it,' -S2 means generate
          2 switch statements with 1/2 the elements in each one, etc.
          Hopefully this will fix the problem with C compilers not being
          able to generate code for giant switch statements (but don't
          hold your breath!)

        * Changed keylist.c's length () function to keyword_list_length ().
          Also put an extern decl for this function and max_key_length ()
          into the keylist.h file (don't know why it wasn't already there...).

Sun Oct 29 08:55:29 1989  Doug Schmidt  (schmidt at siam.ics.uci.edu)

        * Added a feature to main.c that prints out the starting wall-clock
          time before the program begins and prints out the ending wall-clock
          time when the program is finished.

        * Added the GATHER_STATISTICS code in hashtable.c so we can
          keep track of how well double hashing is doing.  Eventually,
          GATHER_STATISTICS will be added so that all instrumentation
          code can be conditionally compiled in.

        * Modified xmalloc.c's buffered_malloc () routine so that it
          rounded the SIZE byte requests up to the correct alignment
          size for the target machine.

Sat Oct 28 11:17:36 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Fixed a stupid bug in keylist.c's print_switch () routine.  This
          was necessary to make sure the generated switch statement worked
          correctly when *both* `natural,' i.e., static links and dynamic
          links, i.e., unresolved duplicates, hash to the same value.

        * Modified LIST_NODE so that the char *char_set field is redeclared
          as char char_set[1] and placed at the bottom of the struct.  This
          enables us to play the old `variable-length string in the struct
          trick' (third time I fell for it this week, chief!).  The
          main purpose of this is to remove n calls to buffered_malloc,
          where n is the number of keywords.

        * Added a new function to xmalloc.c called buffered_malloc.  This
          reduces the number of calls to malloc by grabbing large chunks
          of memory and doling them out in small pieces.  Almost all uses
          of xmalloc were replaced with calls to buffered_malloc ().

        * Modified boolarray.c's bool_array_destroy () function so that
          it now frees the bool_array.storage_array when it is no longer
          needed.  Since this array is generally very large it makes sense
          to return the memory to the freelist when it is no longer in use.

        * Changed the interface to hash_table_init.  This function is
          now passed a pointer to a power-of-two sized buffer that serves
          as storage for the hash table.  Although this weakens information
          hiding a little bit it greatly reduces dynamic memory fragmentation,
          since we can now obtain the memory via a call to alloca, rather
          than malloc.  This change modified keylist.c's read_keys () calling
          interface.

        * Since alloca is now being used more aggressively a conditional
          compilation section was added to the init_all () routine in main.c.
          Taken from GNU GCC, this code gets rid of any avoidable limit
          on stack size so that alloca does not fail.  It is only used
          if the -DRLIMIT_STACK symbol is defined when gperf is compiled.

        * Moved the `destructor' for bool_array from destroy_all () in 
          main.c into perfect_generate () in perfect.c.  This enables
          us to get free up the large dynamic memory as soon as it is no
          longer necessary.  Also moved the hash_table destructor from
          destroy_all into read_keys () from keylist.c.  This accomplishes
          the same purpose, i.e., we can free up the space immediately.

        * Added warnings in option.c so that user's would be informed
          that -r superceeds -i on the command-line.
          
        * Rewrote affects_prev () from perfect.c.  First, the code structure
          was cleaned up considerably (removing the need for a dreaded
          goto!).  Secondly, a major change occurred so that affects_prev ()
          returns FALSE (success) when fewest_hits gets down to whatever
          it was after inserting the previous key (instead of waiting for
          it to reach 0).  In other words, it stops trying if it can
          resolve the new collisions added by a key, even if there are
          still other old, unresolved collisions.  This modification was
          suggested by Nels Olson and seems to *greatly* increase the
          speed of gperf for large keyfiles.  Thanks Nels!

        * In a similar vein, inside the change () routine from perfect.c
          the variable `perfect.fewest_collisions is no longer initialized
          with the length of the keyword list.  Instead it starts out at
          0 and is incremented by 1 every time change () is called.
          The rationale for this behavior is that there are times when a
          collision causes the number of duplicates (collisions) to
          increase by a large amount when it would presumably just have
          gone up by 1 if none of the asso_values were changed.  That is,
          at the beginning of change(), you could initialize fewest_hits
          to 1+(previous value of fewest_hits) instead of to the number of
          keys.  Thanks again, Nels.

        * Replaced alloca with xmalloc in perfect.c's change () function.
          This should eliminate some overhead at the expense of a little
          extra memory that is never reclaimed.

        * Renamed perfect.c's merge_sets () to compute_disjoint_union ()
          to reflect the change in behavior.

Fri Oct 27 10:12:27 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Added the -e option so users can supply a string containing
          the characters used to separate keywords from their attributes.
          The default behavior is ",\n".

        * Removed the char *uniq_set field from LIST_NODE and modified
          uses of uniq_set in perfect.c and keylist.c.  Due to changes
          to perfect.c's merge_set () described below this field was
          no longer necessary, and its removal makes the program
          smaller and potentially faster.
          
        * Added lots of changes/fixes suggested by Nels Olson
          (umls.UUCP!olson@mis.ucsf.edu).  In particular:
          1.  Changed BOOL_ARRAY so that it would dynamically create
              an array of unsigned shorts rather than ints if the 
              LO_CAL symbol was defined during program compilation.
              This cuts the amount of dynamic memory usage in half,
              which is important for large keyfile input.
          2.  Added some additional debugging statements that print extra
              info to stderr when the -d option is enabled.
          3.  Fixed a really stupid bug in the print_switch () from keylist.c.
              A right paren was placed at the wrong location.  
          4.  Fixed a subtle problem with printing case values when keylinks
              appear.  The logic failed to account for the fact that there
              can be keylinks *and* regular node info also!
          5.  Finally split the huge help string into two parts.  This keeps
              breaking compilers with static limits on the length of tokens...
          6.  Modified the -j option so that -j 0 means `try random values
              when searching for a way to resolve collisions.'
          7.  Added a field `num_done' to the PERFECT struct.  This is used
              to report information collected when trying to resolve
              hash collisions.
          8.  Modified the merge_sets algorithm to perform a disjoint
              union of two multisets.  This ensures that subsequent
              processing in perfect.c function affect_prev () doesn't
              waste time trying to change an associated value that is
              shared between two conflicting keywords.
          9.  Modified affects_prev so that it doesn't try random jump
              values unless the -j 0 option is enabled.
          10. Fixed a silly bug in perfect.c change ().
              This problem caused gperf to seg fault when
              the -k* option was given and the keyfile file had long
              keywords.
          11. Changed the behavior of keylist.c's read_keys () routine
              so that it would honor -D unequivocally, i.e., it doesn't
              try to turn off dup handling if the user requests it, even
              if there are no immediate links in the keyfile input.

Mon Oct 16 19:58:08 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Fixed a number of small bugs kindly brought to my attention by
          Adam de Boor (bsw!adam@uunet.UU.NET).  Thanks Adam!  In particular,
          changed the behavior for the -a (ANSI) option so that the
          generated prototypes use int rather than size_t for the LEN 
          parameter.  It was too ugly having to #include <stddef.h> all
          over the place...

        * Added a majorly neat hack to Bool_Array, suggested by rfg.
          The basic idea was to throw away the Ullman array technique.
          The Ullman array was used to remove the need to reinitialize all 
          the Bool_Array elements to zero everytime we needed to determine
          whether there were duplicate hash values in the keyword list.  
          The current trick uses an `iteration number' scheme, which takes
          about 1/3 the space and reduces the overall program running a 
          time by about 20 percent for large input!  The hack works as 
          follows:
          
          1. Dynamically allocate 1 boolean array of size k.
          2. Initialize the boolean array to zeros, and consider the first
             iteration to be iteration 1.
          2. Then on all subsequent iterations we `reset' the bool array by
             kicking the iteration count by 1. 
          3. When it comes time to check whether a hash value is currently
             in the boolean array we simply check its index location.  If
             the value stored there is *not* equal to the current iteration
             number then the item is clearly *not* in the set.  In that
             case we assign the iteration number to that array's index
             location for future reference.  Otherwise, if the item at
             the index location *is* equal to the iteration number we've
             found a duplicate.  No muss, no fuss!

Thu Oct 12 18:08:43 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Updated the version number to 1.9.

        * Added support for the -C option.  This makes the contents of
          all generated tables `readonly'.

        * Changed the handling of generated switches so that there is
          only one call to str[n]?cmp.  This *greatly* reduces the size of
          the generated assembly code on all compilers I've seen.

        * Fixed a subtle bug that occurred when the -l and -S option
          was given.  Code produced looked something like:

          if (len != key_len || !strcmp (s1, resword->name)) return resword;

          which doesn't make any sense.  Clearly, this should be:

          if (len == key_len && !strcmp (s1, resword->name)) return resword;

Sat Sep 30 12:55:24 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Fixed a stupid bug in Key_List::print_hash_function that manifested
          itself if the `-k$' option was given (i.e., only use the key[length]
          character in the hash function).

Mon Jul 24 17:09:46 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Fixed a bug in PRINT_MIN_MAX that resulted in MAX_INT being printed
          for the MIN_KEY_LEN if there was only 1 keyword in the input file
          (yeah, that's a pretty unlikely occurrence, I agree!).

        * Fixed PRINT_HASH_FUNCTION and PRINT_LOOKUP_FUNCTION in keylist.c
          so that the generated functions take an unsigned int length argument.
          If -a is enabled the prototype is (const char *str, size_t len).

Fri Jul 21 13:06:15 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Fixed a horrible typo in PRINT_KEYWORD_TABLE in keylist.cc
          that prevented links from being printed correctly.

Sun Jul  9 17:53:28 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Changed the ./tests subdirectory Makefile so that it 
          uses $(CC) instead of gcc.

Sun Jul  2 12:14:04 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Moved comment handling from keylist.c to readline.c.  This
          simplifies the code and reduces the number of malloc calls.

        * Fixed a number of subtle bugs that occurred when -S was
          combined with various and sundry options.

        * Added the -G option, that makes the generated keyword table
          a global static variable, rather than hiding it inside
          the lookup function.  This allows other functions to directly
          access the contents in this table.

Sat Jul  1 10:12:21 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Added the "#" feature, that allows comments inside the keyword
          list from the input file.
          
        * Also added the -H option (user can give the name of the hash
          function) and the -T option (prevents the transfer of the type decl
          to the output file, which is useful if the type is already defined
          elsewhere).

Fri Jun 30 18:22:35 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Added Adam de Boor's changes.  Created an UNSET_OPTION macro.

Sat Jun 17 10:56:00 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Modified option.h and option.c so that all mixed operations
          between integers and enumerals are cast correctly to int.
          This prevents errors in some brain-damaged C compilers.

Fri Jun 16 14:13:15 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Modified the -f (FAST) option.  This now takes an argument.
          The argument corresponds to the number of iterations used
          to resolve collisions.  -f 0 uses the length of the
          keyword list (which is what -f did before).  This makes
          life much easier when dealing with large keyword files.

Wed Jun  7 23:07:13 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Updated to version 1.8 in preparation to release to Doug Lea
          and FSF.

        * Added the -c (comparison) option.  Enabling this
          will use the strncmp function for string comparisons.
          The default is to use strcmp.

Tue Jun  6 16:32:09 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Fixed another stupid typo in xmalloc.c (XMALLOC).  I accidentally
          left the ANSI-fied prototype in place.  This obviously
          fails on old-style C compilers.

        * Fixed stupid typos in PRINT_SWITCH from the keylist.c.  This
          caused the -D option to produce incorrect output when used
          in conjunction with -p and -t.
          
        * Replaced the use of STRCMP with STRNCMP for the generated
          C output code.          

Fri Jun  2 23:16:01 1989  Doug Schmidt  (schmidt at trinite.ics.uci.edu)

        * Added a new function (XMALLOC) and file (xmalloc.c).  All
          calls to MALLOC were replaced by calls to XMALLOC.  This 
          will complain when virtual memory runs out (don't laugh, 
          this has happened!)

Thu Jun  1 21:10:10 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Fixed a typo in options.c that prevented the -f option
          from being given on the command-line.

Wed May  3 17:48:02 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Updated to version 1.7.  This reflects the recent major changes
          and the new C port.

        * Fixed a typo in perfect.c perfect_destroy that prevented the actual 
          maximum hash table size from being printed.

        * Added support for the -f option.  This generates the perfect
          hash function ``fast.''  It reduces the execution time of
          gperf, at the cost of minimizing the range of hash values.

Tue May  2 16:23:29 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Enabled the diagnostics dump if the debugging option is enabled.
        
        * Removed all calls to FREE (silly to do this at program termination).

        * Ported gperf to C.  From now on both K&R C and GNU G++ versions
          will be supported.