X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=libiberty%2Ffibheap.c;h=a37ee4ef270a55d9df7d47c5722272a9b5f78cab;hb=c59e4eb006120b8dbd6b2d8b38f61601d1699f64;hp=3c8b34722f604266f8268da7ea51d091e2e10f1e;hpb=522a00cddd24663f132a5ef8807da1f9b729f374;p=pf3gnuchains%2Fgcc-fork.git

diff --git a/libiberty/fibheap.c b/libiberty/fibheap.c
index 3c8b34722f6..a37ee4ef270 100644
--- a/libiberty/fibheap.c
+++ b/libiberty/fibheap.c
@@ -1,4 +1,3 @@
-
 /* A Fibonacci heap datatype.
    Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
    Contributed by Daniel Berlin (dan@cgsoftware.com).
@@ -17,67 +16,92 @@ General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+the Free Software Foundation, 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
 
-/* Fibonacci heaps */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifdef HAVE_LIMITS_H
 #include <limits.h>
+#endif
+#ifdef HAVE_STDLIB_H
 #include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 #include "libiberty.h"
 #include "fibheap.h"
 
 
-static void fibheap_init PARAMS ((fibheap_t));
-static void fibheap_ins_root PARAMS ((fibheap_t, fibnode_t));
-static void fibheap_rem_root PARAMS ((fibheap_t, fibnode_t));
-static void fibheap_consolidate PARAMS ((fibheap_t));
-static void fibheap_link PARAMS ((fibheap_t, fibnode_t, fibnode_t));
-static void fibheap_cut PARAMS ((fibheap_t, fibnode_t, fibnode_t));
-static void fibheap_cascading_cut PARAMS ((fibheap_t, fibnode_t));
-static fibnode_t fibheap_extr_min_node PARAMS ((fibheap_t));
-static int fibheap_compare PARAMS ((fibheap_t, fibnode_t, fibnode_t));
-static int fibheap_comp_data PARAMS ((fibheap_t, fibheapkey_t, void *, fibnode_t));
-static fibnode_t fibnode_new PARAMS ((void));
-static void fibnode_init PARAMS ((fibnode_t));
-static void fibnode_insert_after PARAMS ((fibnode_t, fibnode_t));
+#define FIBHEAPKEY_MIN	LONG_MIN
+
+static void fibheap_ins_root (fibheap_t, fibnode_t);
+static void fibheap_rem_root (fibheap_t, fibnode_t);
+static void fibheap_consolidate (fibheap_t);
+static void fibheap_link (fibheap_t, fibnode_t, fibnode_t);
+static void fibheap_cut (fibheap_t, fibnode_t, fibnode_t);
+static void fibheap_cascading_cut (fibheap_t, fibnode_t);
+static fibnode_t fibheap_extr_min_node (fibheap_t);
+static int fibheap_compare (fibheap_t, fibnode_t, fibnode_t);
+static int fibheap_comp_data (fibheap_t, fibheapkey_t, void *, fibnode_t);
+static fibnode_t fibnode_new (void);
+static void fibnode_insert_after (fibnode_t, fibnode_t);
 #define fibnode_insert_before(a, b) fibnode_insert_after (a->left, b)
-static fibnode_t fibnode_remove PARAMS ((fibnode_t));
+static fibnode_t fibnode_remove (fibnode_t);
 
+
 /* Create a new fibonacci heap.  */
 fibheap_t
-fibheap_new ()
+fibheap_new (void)
 {
-  fibheap_t result;
+  return (fibheap_t) xcalloc (1, sizeof (struct fibheap));
+}
 
-  if ((result = xmalloc (sizeof (*result))) == NULL)
-    return NULL;
+/* Create a new fibonacci heap node.  */
+static fibnode_t
+fibnode_new (void)
+{
+  fibnode_t node;
 
-  fibheap_init (result);
+  node = (fibnode_t) xcalloc (1, sizeof *node);
+  node->left = node;
+  node->right = node;
 
-  return result;
+  return node;
 }
 
-/* Initialize the passed in fibonacci heap.  */
-static void
-fibheap_init (heap)
-     fibheap_t heap;
+static inline int
+fibheap_compare (fibheap_t heap ATTRIBUTE_UNUSED, fibnode_t a, fibnode_t b)
 {
-  heap->nodes = 0;
-  heap->min = NULL;
-  heap->root = NULL;
+  if (a->key < b->key)
+    return -1;
+  if (a->key > b->key)
+    return 1;
+  return 0;
+}
+
+static inline int
+fibheap_comp_data (fibheap_t heap, fibheapkey_t key, void *data, fibnode_t b)
+{
+  struct fibnode a;
+
+  a.key = key;
+  a.data = data;
+
+  return fibheap_compare (heap, &a, b);
 }
 
 /* Insert DATA, with priority KEY, into HEAP.  */
 fibnode_t
-fibheap_insert (heap, key, data)
-     fibheap_t heap;
-     fibheapkey_t key;
-     void *data;
+fibheap_insert (fibheap_t heap, fibheapkey_t key, void *data)
 {
   fibnode_t node;
-  /* Create the new node, if we fail, return NULL.  */
-  if ((node = fibnode_new ()) == NULL)
-    return NULL;
+
+  /* Create the new node.  */
+  node = fibnode_new ();
+
   /* Set the node's data.  */
   node->data = data;
   node->key = key;
@@ -85,8 +109,8 @@ fibheap_insert (heap, key, data)
   /* Insert it into the root list.  */
   fibheap_ins_root (heap, node);
 
-  /* If their was no minimum, or this key is less than the min, it's the new
-     min.  */
+  /* If their was no minimum, or this key is less than the min,
+     it's the new min.  */
   if (heap->min == NULL || node->key < heap->min->key)
     heap->min = node;
 
@@ -97,8 +121,7 @@ fibheap_insert (heap, key, data)
 
 /* Return the data of the minimum node (if we know it).  */
 void *
-fibheap_min (heap)
-     fibheap_t heap;
+fibheap_min (fibheap_t heap)
 {
   /* If there is no min, we can't easily return it.  */
   if (heap->min == NULL)
@@ -108,8 +131,7 @@ fibheap_min (heap)
 
 /* Return the key of the minimum node (if we know it).  */
 fibheapkey_t
-fibheap_min_key (heap)
-     fibheap_t heap;
+fibheap_min_key (fibheap_t heap)
 {
   /* If there is no min, we can't easily return it.  */
   if (heap->min == NULL)
@@ -119,32 +141,28 @@ fibheap_min_key (heap)
 
 /* Union HEAPA and HEAPB into a new heap.  */
 fibheap_t
-fibheap_union (heapa, heapb)
-     fibheap_t heapa;
-     fibheap_t heapb;
+fibheap_union (fibheap_t heapa, fibheap_t heapb)
 {
-  fibnode_t temp;
+  fibnode_t a_root, b_root, temp;
 
   /* If one of the heaps is empty, the union is just the other heap.  */
-  if (heapa->root == NULL || heapb->root == NULL)
+  if ((a_root = heapa->root) == NULL)
     {
-      if (heapa->root == NULL)
-	{
-	  free (heapa);
-	  return heapb;
-	}
-      else
-	{
-	  free (heapb);
-	  return heapa;
-	}
+      free (heapa);
+      return heapb;
     }
+  if ((b_root = heapb->root) == NULL)
+    {
+      free (heapb);
+      return heapa;
+    }
+
   /* Merge them to the next nodes on the opposite chain.  */
-  heapa->root->left->right = heapb->root;
-  heapb->root->left->right = heapa->root;
-  temp = heapa->root->left;
-  heapa->root->left = heapb->root->left;
-  heapb->root->left = temp;
+  a_root->left->right = b_root;
+  b_root->left->right = a_root;
+  temp = a_root->left;
+  a_root->left = b_root->left;
+  b_root->left = temp;
   heapa->nodes += heapb->nodes;
 
   /* And set the new minimum, if it's changed.  */
@@ -157,13 +175,11 @@ fibheap_union (heapa, heapb)
 
 /* Extract the data of the minimum node from HEAP.  */
 void *
-fibheap_extract_min (heap)
-     fibheap_t heap;
+fibheap_extract_min (fibheap_t heap)
 {
   fibnode_t z;
-  void *ret;
+  void *ret = NULL;
 
-  ret = NULL;
   /* If we don't have a min set, it means we have no nodes.  */
   if (heap->min != NULL)
     {
@@ -177,41 +193,13 @@ fibheap_extract_min (heap)
   return ret;
 }
 
-/* Replace the DATA associated with NODE.  */
-void *
-fibheap_replace_data (heap, node, data)
-     fibheap_t heap;
-     fibnode_t node;
-     void *data;
-{
-  return fibheap_replace_key_data (heap, node, node->key, data);
-}
-
-/* Replace the KEY associated with NODE.  */
-fibheapkey_t
-fibheap_replace_key (heap, node, key)
-     fibheap_t heap;
-     fibnode_t node;
-     fibheapkey_t key;
-{
-  int ret;
-
-  ret = node->key;
-  (void) fibheap_replace_key_data (heap, node, key, node->data);
-
-  return ret;
-}
-
 /* Replace both the KEY and the DATA associated with NODE.  */
 void *
-fibheap_replace_key_data (heap, node, key, data)
-     fibheap_t heap;
-     fibnode_t node;
-     fibheapkey_t key;
-     void *data;
+fibheap_replace_key_data (fibheap_t heap, fibnode_t node,
+                          fibheapkey_t key, void *data)
 {
   void *odata;
-  int okey;
+  fibheapkey_t okey;
   fibnode_t y;
 
   /* If we wanted to, we could actually do a real increase by redeleting and
@@ -226,7 +214,10 @@ fibheap_replace_key_data (heap, node, key, data)
   node->key = key;
   y = node->parent;
 
-  if (okey == key)
+  /* Short-circuit if the key is the same, as we then don't have to
+     do anything.  Except if we're trying to force the new node to
+     be the new minimum for delete.  */
+  if (okey == key && okey != FIBHEAPKEY_MIN)
     return odata;
 
   /* These two compares are specifically <= 0 to make sure that in the case
@@ -244,25 +235,43 @@ fibheap_replace_key_data (heap, node, key, data)
   return odata;
 }
 
+/* Replace the DATA associated with NODE.  */
+void *
+fibheap_replace_data (fibheap_t heap, fibnode_t node, void *data)
+{
+  return fibheap_replace_key_data (heap, node, node->key, data);
+}
+
+/* Replace the KEY associated with NODE.  */
+fibheapkey_t
+fibheap_replace_key (fibheap_t heap, fibnode_t node, fibheapkey_t key)
+{
+  int okey = node->key;
+  fibheap_replace_key_data (heap, node, key, node->data);
+  return okey;
+}
+
 /* Delete NODE from HEAP.  */
 void *
-fibheap_delete_node (heap, node)
-     fibheap_t heap;
-     fibnode_t node;
+fibheap_delete_node (fibheap_t heap, fibnode_t node)
 {
-  void *k;
+  void *ret = node->data;
+
   /* To perform delete, we just make it the min key, and extract.  */
-  k = node->data;
-  fibheap_replace_key (heap, node, LONG_MIN);
+  fibheap_replace_key (heap, node, FIBHEAPKEY_MIN);
+  if (node != heap->min)
+    {
+      fprintf (stderr, "Can't force minimum on fibheap.\n");
+      abort ();
+    }
   fibheap_extract_min (heap);
 
-  return k;
+  return ret;
 }
 
 /* Delete HEAP.  */
 void
-fibheap_delete (heap)
-     fibheap_t heap;
+fibheap_delete (fibheap_t heap)
 {
   while (heap->min != NULL)
     free (fibheap_extr_min_node (heap));
@@ -272,38 +281,33 @@ fibheap_delete (heap)
 
 /* Determine if HEAP is empty.  */
 int
-fibheap_empty (heap)
-     fibheap_t heap;
+fibheap_empty (fibheap_t heap)
 {
   return heap->nodes == 0;
 }
 
-
 /* Extract the minimum node of the heap.  */
 static fibnode_t
-fibheap_extr_min_node (heap)
-     fibheap_t heap;
+fibheap_extr_min_node (fibheap_t heap)
 {
-  fibnode_t ret;
+  fibnode_t ret = heap->min;
   fibnode_t x, y, orig;
 
-  ret = heap->min;
-
-  orig = NULL;
   /* Attach the child list of the minimum node to the root list of the heap.
      If there is no child list, we don't do squat.  */
-  for (x = ret->child; x != orig && x != NULL;)
+  for (x = ret->child, orig = NULL; x != orig && x != NULL; x = y)
     {
       if (orig == NULL)
 	orig = x;
       y = x->right;
       x->parent = NULL;
       fibheap_ins_root (heap, x);
-      x = y;
     }
+
   /* Remove the old root.  */
   fibheap_rem_root (heap, ret);
   heap->nodes--;
+
   /* If we are left with no nodes, then the min is NULL.  */
   if (heap->nodes == 0)
     heap->min = NULL;
@@ -320,9 +324,7 @@ fibheap_extr_min_node (heap)
 
 /* Insert NODE into the root list of HEAP.  */
 static void
-fibheap_ins_root (heap, node)
-     fibheap_t heap;
-     fibnode_t node;
+fibheap_ins_root (fibheap_t heap, fibnode_t node)
 {
   /* If the heap is currently empty, the new node becomes the singleton
      circular root list.  */
@@ -333,16 +335,15 @@ fibheap_ins_root (heap, node)
       node->right = node;
       return;
     }
-  /* Otherwise, insert it in the circular root list between the root and it's 
-     right node.  */
+
+  /* Otherwise, insert it in the circular root list between the root
+     and it's right node.  */
   fibnode_insert_after (heap->root, node);
 }
 
 /* Remove NODE from the rootlist of HEAP.  */
 static void
-fibheap_rem_root (heap, node)
-     fibheap_t heap;
-     fibnode_t node;
+fibheap_rem_root (fibheap_t heap, fibnode_t node)
 {
   if (node->left == node)
     heap->root = NULL;
@@ -352,8 +353,7 @@ fibheap_rem_root (heap, node)
 
 /* Consolidate the heap.  */
 static void
-fibheap_consolidate (heap)
-     fibheap_t heap;
+fibheap_consolidate (fibheap_t heap)
 {
   fibnode_t a[1 + 8 * sizeof (long)];
   fibnode_t w;
@@ -400,10 +400,8 @@ fibheap_consolidate (heap)
 
 /* Make NODE a child of PARENT.  */
 static void
-fibheap_link (heap, node, parent)
-     fibheap_t heap ATTRIBUTE_UNUSED;
-     fibnode_t node;
-     fibnode_t parent;
+fibheap_link (fibheap_t heap ATTRIBUTE_UNUSED,
+              fibnode_t node, fibnode_t parent)
 {
   if (parent->child == NULL)
     parent->child = node;
@@ -416,10 +414,7 @@ fibheap_link (heap, node, parent)
 
 /* Remove NODE from PARENT's child list.  */
 static void
-fibheap_cut (heap, node, parent)
-     fibheap_t heap;
-     fibnode_t node;
-     fibnode_t parent;
+fibheap_cut (fibheap_t heap, fibnode_t node, fibnode_t parent)
 {
   fibnode_remove (node);
   parent->degree--;
@@ -429,9 +424,7 @@ fibheap_cut (heap, node, parent)
 }
 
 static void
-fibheap_cascading_cut (heap, y)
-     fibheap_t heap;
-     fibnode_t y;
+fibheap_cascading_cut (fibheap_t heap, fibnode_t y)
 {
   fibnode_t z;
 
@@ -450,37 +443,8 @@ fibheap_cascading_cut (heap, y)
     }
 }
 
-
-static fibnode_t
-fibnode_new ()
-{
-  fibnode_t e;
-
-  if ((e = xmalloc (sizeof *e)) == NULL)
-    return NULL;
-
-  fibnode_init (e);
-
-  return e;
-}
-
 static void
-fibnode_init (node)
-     fibnode_t node;
-{
-  node->degree = 0;
-  node->mark = 0;
-  node->parent = NULL;
-  node->child = NULL;
-  node->left = node;
-  node->right = node;
-  node->data = NULL;
-}
-
-static void
-fibnode_insert_after (a, b)
-     fibnode_t a;
-     fibnode_t b;
+fibnode_insert_after (fibnode_t a, fibnode_t b)
 {
   if (a == a->right)
     {
@@ -498,10 +462,8 @@ fibnode_insert_after (a, b)
     }
 }
 
-
 static fibnode_t
-fibnode_remove (node)
-     fibnode_t node;
+fibnode_remove (fibnode_t node)
 {
   fibnode_t ret;
 
@@ -522,31 +484,3 @@ fibnode_remove (node)
 
   return ret;
 }
-
-static int
-fibheap_compare (heap, a, b)
-     fibheap_t heap ATTRIBUTE_UNUSED;
-     fibnode_t a;
-     fibnode_t b;
-{
-  if (a->key < b->key)
-    return -1;
-  if (a->key > b->key)
-    return 1;
-  return 0;
-}
-
-static int
-fibheap_comp_data (heap, key, data, b)
-     fibheap_t heap;
-     fibheapkey_t key;
-     void *data;
-     fibnode_t b;
-{
-  struct fibnode a;
-
-  a.key = key;
-  a.data = data;
-
-  return fibheap_compare (heap, &a, b);
-}