changelog

早期freebsd实现

          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 allocation 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!
             
Mon Oct  2 12:30:54 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Changed some consts in options.h to enumerals, since g++
          doesn't seem to like them at the moment!

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).

        * 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;

Tue Sep 26 10:36:50 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Changed class Read_Line's definition so that it no longer
          needs to know about the buffering scheme used to speed up 
          dynamic memory allocation of input keywords and their
          associated attributes.  This means that operator new is no longer
          a friend of Read_Line.

Mon Sep 25 23:17:10 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Decided that Obstacks had too much overhead, so they were
          removed in favor of super-efficient, low-overhead buffered
          storage allocation hacks in Read_Line and List_Node.

        * No longer try to inline functions that g++ complains about
          (Key_List::Merge and Key_List::Merge_Sort).

Sun Sep 24 13:11:24 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Changed classes Read_Line and List_Node to use Obstacks in order
          to cache memory allocation for keyword strings and List_Nodes.
          
        * Continued to experiment with inheritance schemes.
        
        * Added a new file `alpha.h', that declares static data shared
          (i.e., inherited) between classes List_Node and Key_List.

Tue Sep 12 16:14:41 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Made numerous changes to incorporate multiple inheritance in 
          gperf.

Wed Aug 16 23:04:08 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Added the -DCOMPILER_FIXED flag to the ./src/Makefile.  This
          implies that people trying to compile gperf need to have a
          working version of the new g++ compiler (1.36.0).

        * Removed some extra spaces that were being added in the generated
          C code.

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

        * 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 typo in PRINT_KEYWORD_TABLE in keylist.cc that prevented
          the indentation from working correctly.

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

Tue Jul 18 16:04:31 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Fixed up readline.cc and readline.h so that they work OK
          with g++ compilers that aren't completely up-to-date.
          If symbol COMPILER_FIXED is defined then the behavior
          that works on my more recent version of g++ is enabled.

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 21:52:15 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * 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.

        * Added the "#" feature, that allows comments inside the keyword
          list from the input file. Comment handling takes place in readline.c.  
          This simplifies the code and reduces the number of malloc calls.
          
        * 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).

Thu Jun 22 20:39:39 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Modified many classes so that they would inherit Std_Err as
          a base class.  This makes things more abstract...

Fri Jun 16 14:23:00 1989  Doug Schmidt  (schmidt at zola.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.

Tue Jun  6 17:53:27 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

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

        * Fixed a typo in key_list.cc (PRINT_SWITCH).  This caused
          faulty C code to be generated when the -D, -p, and -t
          options were all enabled.

Thu May 25 14:07:21 1989  Doug Schmidt  (schmidt at siam.ics.uci.edu)

        * Once again, changed class Read_Line to overload global operator
          new.  Hopefully, this will work...!

Sun May 21 01:51:45 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Modified Key_List::print_hash_function () so that it properly
          formats the associated values in the hash table according to
          the maximum number of digits required to represent the largest
          value.

        * Removed the named return value from class Hash_Table's
          operator (), since this causes a seg fault when -O is enabled.
          No sense tripping subtle g++ bugs if we don't have to.... ;-)

        * Removed the operator new hack from Read_Line, since this seemed
          to create horrible bus error problems.
                    
        * Changed many class member functions and data members to be `static', 
          if they don't manipulate this!
          
Fri May 12 23:06:56 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Changed class Std_Err to use static member functions, a la
          Ada or Modula 2.  This eliminates the need for an explicit
          error-handler class object.

        * Added the ``named return value'' feature to Hash_Table::operator ()
          and Bool_Array::operator [], just for the heck of it.... ;-)

        * Changed the previous hack in Read_Line so that we now use
          the overloaded global `new' instead of NEW_STRING!

Wed May  3 17:36:55 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.

        * Modified the GNU getopt.cc routine to have a class-based interface.

        * Fixed a typo in Perfect.cc ~Perfect that prevented the actual maximum
          hash table size from being printed (maybe the stream classes
          weren't so bad after all.... ;-).

        * 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)

        * Added an efficiency hack to Read_Line.  Instead of making
          a call to operator NEW (a.k.a. malloc) for each input string
          a new member function NEW_STRING stores a large buffer from
          which new strings are carved out, growing the buffer if
          necessary.  It might be useful to add this throughout the
          program....

        * Removed all unnecessary calls to DELETE.  If the program is about
          to exit it is silly to waste time freeing memory.

        * Added the GNU getopt program to the distribution.  This makes
          GPERF portable to systems that don't include getopt in libc.
          
        * Added a strcspn member to class Key_List.  This also increases
          portability.

        * Added the get_include_src function from keylist.c as a member
          function in class Key_List.  Hopefully every function is 
          now associated with a class.  This aids abstraction and
          modularity.

        * Ported gperf to C.  From now on both K&R C and GNU G++ versions
          will be supported.  There will be two ChangeLog files, one
          for each version of the program.

Mon May  1 16:41:45 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Fixed a bug with -k'*'.  This now prints out *all* the cases
          up to the length of the longest word in the keyword set.

Sun Apr 30 12:15:25 1989  Doug Schmidt  (schmidt at crimee.ics.uci.edu)

        * Removed all use of the stream classes.  Too ugly, slow, and
          not handled by the c++-mode formatter....

        * Modified the handling of links (i.e., keywords that have
          identical hash values as other keywords).  This should 
          speed up hash function generation for keyword sets with
          many duplicate entries.  The trick is to treat duplicate
          values as equivalence classes, so that each set of duplicate
          values is represented only once in the main list processing.

        * Fixed some capitialization typos and indentations mistakes in 
          Key_List::print_hash_function.

Sat Apr 29 12:04:03 1989  Doug Schmidt  (schmidt at zola.ics.uci.edu)

        * Fixed a typo/logico in Key_List::print_switch that prevented
          the last keyword in the keyword list to be print out.  This
          requires further examination.....

        * Fixed a stupid bug in List_Node::List_node.  If the -k'*' option
          was enabled the KEY_SET string wasn't getting terminated with
          '\0'!

Fri Apr 28 12:38:35 1989  Doug Schmidt  (schmidt at glacier.ics.uci.edu)

        * Renamed strexp.h and strexp.cc to iterator.h and iterator.cc.
          Also changed the strexp class to iterator.  Continued to work
          on style...

        * Updated the version number to 1.6.  This reflects all the 
          recent changes.