lib-src/rewrite/cache.cc

   1 //////////////////////////////////////////////////////////////////////////////
   2 // NOTICE:
   3 //
   4 // ADLib, Prop and their related set of tools and documentation are in the
   5 // public domain.   The author(s) of this software reserve no copyrights on
   6 // the source code and any code generated using the tools.  You are encouraged
   7 // to use ADLib and Prop to develop software, in both academic and commercial
   8 // settings, and are welcomed to incorporate any part of ADLib and Prop into
   9 // your programs.
  10 //
  11 // Although you are under no obligation to do so, we strongly recommend that
  12 // you give away all software developed using our tools.
  13 //
  14 // We also ask that credit be given to us when ADLib and/or Prop are used in
  15 // your programs, and that this notice be preserved intact in all the source
  16 // code.
  17 //
  18 // This software is still under development and we welcome(read crave for)
  19 // any suggestions and help from the users.
  20 //
  21 // Allen Leung (leunga@cs.nyu.edu)
  22 // 1994-1997
  23 //////////////////////////////////////////////////////////////////////////////
  24 #include <string.h>
  25 #include <AD/rewrite/cache.h>
  26
  27 RewriteCache::RewriteCache() : the_cache(0), the_capacity(0) {}
  28 RewriteCache::RewriteCache(int c) : the_cache(0), the_capacity(c) {}
  29 RewriteCache::~RewriteCache() { clear(); }
  30
  31 void RewriteCache::clear()
  32 {  if (the_cache)
  33    {  // for the benefit of the GC
  34       memset(the_cache,0,sizeof(Table) * the_capacity);
  35       delete [] the_cache;
  36    }
  37 }
  38
  39 void RewriteCache::initialize()
  40 {  if (the_cache == 0)
  41    {  if (the_capacity <= 0) the_capacity = 1023;
  42       the_cache = new Table [the_capacity];
  43    }
  44    memset(the_cache,0,sizeof(Table) * the_capacity);
  45 }
  46
  47 void RewriteCache::initialize(int c)
  48 {  if (the_cache && the_capacity != c) clear();
  49    the_capacity = c; initialize();
  50 }