1 files changed, 166 insertions, 0 deletions
diff --git a/gnu/lib/libg++/g++-include/CHMap.ccP b/gnu/lib/libg++/g++-include/CHMap.ccP
new file mode 100644
index 000000000000..1bd76db5fc97
--- /dev/null
+++ b/gnu/lib/libg++/g++-include/CHMap.ccP
@@ -0,0 +1,166 @@
+// This may look like C code, but it is really -*- C++ -*-
+/* 
+Copyright (C) 1988 Free Software Foundation
+    written by Doug Lea (dl@rocky.oswego.edu)
+
+This file is part of the GNU C++ Library.  This library is free
+software; you can redistribute it and/or modify it under the terms of
+the GNU Library General Public License as published by the Free
+Software Foundation; either version 2 of the License, or (at your
+option) any later version.  This library is distributed in the hope
+that it will be useful, but WITHOUT ANY WARRANTY; without even the
+implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+PURPOSE.  See the GNU Library General Public License for more details.
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifdef __GNUG__
+#pragma implementation
+#endif
+#include "<T>.<C>.CHMap.h"
+
+// The nodes are linked together serially via a version
+// of a trick used in some vtables: odd pointers are
+// actually links to the next table entry. 
+// Not terrible, but not wonderful either
+
+static inline int goodCHptr(<T><C>CHNode* t)
+{
+  return ((((unsigned)t) & 1) == 0);
+}
+
+static inline <T><C>CHNode* index_to_CHptr(int i)
+{
+  return (<T><C>CHNode*)((i << 1) + 1);
+}
+
+static inline int CHptr_to_index(<T><C>CHNode* t)
+{
+  return ( ((unsigned) t) >> 1);
+}
+
+<T><C>CHMap::<T><C>CHMap(<C&> dflt, unsigned int sz)
+     :<T><C>Map(dflt)
+{
+  tab = (<T><C>CHNode**)(new <T><C>CHNodePtr[size = sz]);
+  for (unsigned int i = 0; i < size; ++i) tab[i] = index_to_CHptr(i+1);
+  count = 0;
+}
+
+<T><C>CHMap::<T><C>CHMap(<T><C>CHMap& a) :<T><C>Map(a.def)
+{
+  tab = (<T><C>CHNode**)(new <T><C>CHNodePtr[size = a.size]);
+  for (unsigned int i = 0; i < size; ++i) tab[i] = index_to_CHptr(i+1);
+  count = 0;
+  for (Pix p = a.first(); p; a.next(p)) (*this)[a.key(p)] = a.contents(p);
+}
+
+
+Pix <T><C>CHMap::seek(<T&> key)
+{
+  unsigned int h = <T>HASH(key) % size;
+
+  for (<T><C>CHNode* t = tab[h]; goodCHptr(t); t = t->tl)
+    if (<T>EQ(key, t->hd))
+      return Pix(t);
+
+  return 0;
+}
+
+
+<C>& <T><C>CHMap::operator [](<T&> item)
+{
+  unsigned int h = <T>HASH(item) % size;
+
+  for (<T><C>CHNode* t = tab[h]; goodCHptr(t); t = t->tl)
+    if (<T>EQ(item, t->hd))
+      return t->cont;
+
+  t = new <T><C>CHNode(item, def, tab[h]);
+  tab[h] = t;
+  ++count;
+  return t->cont;
+}
+
+
+void <T><C>CHMap::del(<T&> key)
+{
+  unsigned int h = <T>HASH(key) % size;
+
+  <T><C>CHNode* t = tab[h]; 
+  <T><C>CHNode* trail = t;
+  while (goodCHptr(t))
+  {
+    if (<T>EQ(key, t->hd))
+    {
+      if (trail == t)
+        tab[h] = t->tl;
+      else
+        trail->tl = t->tl;
+      delete t;
+      --count;
+      return;
+    }
+    trail = t;
+    t = t->tl;
+  }
+}
+
+
+void <T><C>CHMap::clear()
+{
+  for (unsigned int i = 0; i < size; ++i)
+  {
+    <T><C>CHNode* p = tab[i];
+    tab[i] = index_to_CHptr(i+1);
+    while (goodCHptr(p))
+    {
+      <T><C>CHNode* nxt = p->tl;
+      delete(p);
+      p = nxt;
+    }
+  }
+  count = 0;
+}
+
+Pix <T><C>CHMap::first()
+{
+  for (unsigned int i = 0; i < size; ++i) if (goodCHptr(tab[i])) return Pix(tab[i]);
+  return 0;
+}
+
+void <T><C>CHMap::next(Pix& p)
+{
+  <T><C>CHNode* t = ((<T><C>CHNode*)p)->tl;
+  if (goodCHptr(t))
+    p = Pix(t);
+  else
+  {
+    for (unsigned int i = CHptr_to_index(t); i < size; ++i) 
+    {
+      if (goodCHptr(tab[i]))
+      {
+        p =  Pix(tab[i]);
+        return;
+      }
+    }
+    p = 0;
+  }
+}
+
+
+int <T><C>CHMap::OK()
+{
+  int v = tab != 0;
+  int n = 0;
+  for (unsigned int i = 0; i < size; ++i)
+  {
+    for (<T><C>CHNode* p = tab[i]; goodCHptr(p); p = p->tl) ++n;
+    v &= CHptr_to_index(p) == i + 1;
+  }
+  v &= count == n;
+  if (!v) error("invariant failure");
+  return v;
+}