--- /dev/null
+/* A splay-tree datatype.
+ Copyright (C) 1998, 1999, 2000, 2001, 2004 Free Software Foundation, Inc.
+ Contributed by Mark Mitchell (mark@markmitchell.com).
+ Adapted for libmudflap from libiberty.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file. (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GNU CC 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
+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. */
+
+/* For an easily readable description of splay-trees, see:
+
+ Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
+ Algorithms. Harper-Collins, Inc. 1991. */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "splay-tree.h"
+
+static void splay_tree_delete_helper PARAMS((splay_tree,
+ splay_tree_node));
+static void splay_tree_splay PARAMS((splay_tree,
+ splay_tree_key));
+static splay_tree_node splay_tree_splay_helper
+ PARAMS((splay_tree,
+ splay_tree_key,
+ splay_tree_node*,
+ splay_tree_node*,
+ splay_tree_node*));
+static int splay_tree_foreach_helper PARAMS((splay_tree,
+ splay_tree_node,
+ splay_tree_foreach_fn,
+ void*));
+
+
+
+/* Inline comparison function specialized for libmudflap's key type. */
+static inline int
+compare_uintptr_t (splay_tree_key k1, splay_tree_key k2)
+{
+ if ((uintptr_t) k1 < (uintptr_t) k2)
+ return -1;
+ else if ((uintptr_t) k1 > (uintptr_t) k2)
+ return 1;
+ else
+ return 0;
+}
+
+
+
+/* Deallocate NODE (a member of SP), and all its sub-trees. */
+
+static void
+splay_tree_delete_helper (sp, node)
+ splay_tree sp;
+ splay_tree_node node;
+{
+ if (!node)
+ return;
+
+ splay_tree_delete_helper (sp, node->left);
+ splay_tree_delete_helper (sp, node->right);
+ (*sp->deallocate) ((char*) node, sp->allocate_data);
+}
+
+/* Help splay SP around KEY. PARENT and GRANDPARENT are the parent
+ and grandparent, respectively, of NODE. */
+
+static splay_tree_node
+splay_tree_splay_helper (sp, key, node, parent, grandparent)
+ splay_tree sp;
+ splay_tree_key key;
+ splay_tree_node *node;
+ splay_tree_node *parent;
+ splay_tree_node *grandparent;
+{
+ splay_tree_node *next;
+ splay_tree_node n;
+ int comparison;
+
+ n = *node;
+
+ if (!n)
+ return *parent;
+
+ comparison = compare_uintptr_t (key, n->key);
+
+ if (comparison == 0)
+ /* We've found the target. */
+ next = 0;
+ else if (comparison < 0)
+ /* The target is to the left. */
+ next = &n->left;
+ else
+ /* The target is to the right. */
+ next = &n->right;
+
+ if (next)
+ {
+ /* Continue down the tree. */
+ n = splay_tree_splay_helper (sp, key, next, node, parent);
+
+ /* The recursive call will change the place to which NODE
+ points. */
+ if (*node != n)
+ return n;
+ }
+
+ if (!parent)
+ /* NODE is the root. We are done. */
+ return n;
+
+ /* First, handle the case where there is no grandparent (i.e.,
+ *PARENT is the root of the tree.) */
+ if (!grandparent)
+ {
+ if (n == (*parent)->left)
+ {
+ *node = n->right;
+ n->right = *parent;
+ }
+ else
+ {
+ *node = n->left;
+ n->left = *parent;
+ }
+ *parent = n;
+ return n;
+ }
+
+ /* Next handle the cases where both N and *PARENT are left children,
+ or where both are right children. */
+ if (n == (*parent)->left && *parent == (*grandparent)->left)
+ {
+ splay_tree_node p = *parent;
+
+ (*grandparent)->left = p->right;
+ p->right = *grandparent;
+ p->left = n->right;
+ n->right = p;
+ *grandparent = n;
+ return n;
+ }
+ else if (n == (*parent)->right && *parent == (*grandparent)->right)
+ {
+ splay_tree_node p = *parent;
+
+ (*grandparent)->right = p->left;
+ p->left = *grandparent;
+ p->right = n->left;
+ n->left = p;
+ *grandparent = n;
+ return n;
+ }
+
+ /* Finally, deal with the case where N is a left child, but *PARENT
+ is a right child, or vice versa. */
+ if (n == (*parent)->left)
+ {
+ (*parent)->left = n->right;
+ n->right = *parent;
+ (*grandparent)->right = n->left;
+ n->left = *grandparent;
+ *grandparent = n;
+ return n;
+ }
+ else
+ {
+ (*parent)->right = n->left;
+ n->left = *parent;
+ (*grandparent)->left = n->right;
+ n->right = *grandparent;
+ *grandparent = n;
+ return n;
+ }
+}
+
+/* Splay SP around KEY. */
+
+static void
+splay_tree_splay (sp, key)
+ splay_tree sp;
+ splay_tree_key key;
+{
+ if (sp->root == 0)
+ return;
+
+ /* If we just splayed the tree with the same key, do nothing. */
+ if (sp->last_splayed_key_p &&
+ compare_uintptr_t (sp->last_splayed_key, key) == 0)
+ return;
+
+ splay_tree_splay_helper (sp, key, &sp->root,
+ /*grandparent=*/0, /*parent=*/0);
+
+ /* Cache this splay key. */
+ sp->last_splayed_key = key;
+ sp->last_splayed_key_p = 1;
+}
+
+/* Call FN, passing it the DATA, for every node below NODE, all of
+ which are from SP, following an in-order traversal. If FN every
+ returns a non-zero value, the iteration ceases immediately, and the
+ value is returned. Otherwise, this function returns 0. */
+
+static int
+splay_tree_foreach_helper (sp, node, fn, data)
+ splay_tree sp;
+ splay_tree_node node;
+ splay_tree_foreach_fn fn;
+ void* data;
+{
+ int val;
+
+ if (!node)
+ return 0;
+
+ val = splay_tree_foreach_helper (sp, node->left, fn, data);
+ if (val)
+ return val;
+
+ val = (*fn)(node, data);
+ if (val)
+ return val;
+
+ return splay_tree_foreach_helper (sp, node->right, fn, data);
+}
+
+
+/* An allocator and deallocator based on xmalloc. */
+static void *
+splay_tree_xmalloc_allocate (size, data)
+ int size;
+ void *data ATTRIBUTE_UNUSED;
+{
+ return (void *) xmalloc (size);
+}
+
+static void
+splay_tree_xmalloc_deallocate (object, data)
+ void *object;
+ void *data ATTRIBUTE_UNUSED;
+{
+ free (object);
+}
+
+
+/* Allocate a new splay tree, using COMPARE_FN to compare nodes,
+ DELETE_KEY_FN to deallocate keys, and DELETE_VALUE_FN to deallocate
+ values. Use xmalloc to allocate the splay tree structure, and any
+ nodes added. */
+
+splay_tree
+splay_tree_new ()
+{
+ splay_tree_allocate_fn allocate_fn = splay_tree_xmalloc_allocate;
+ splay_tree_deallocate_fn deallocate_fn = splay_tree_xmalloc_deallocate;
+ void *allocate_data = NULL;
+ splay_tree sp = (splay_tree) (*allocate_fn) (sizeof (struct splay_tree_s),
+ allocate_data);
+ sp->root = 0;
+ sp->allocate = allocate_fn;
+ sp->deallocate = deallocate_fn;
+ sp->allocate_data = allocate_data;
+ sp->last_splayed_key_p = 0;
+
+ return sp;
+}
+
+/* Deallocate SP. */
+
+void
+splay_tree_delete (sp)
+ splay_tree sp;
+{
+ splay_tree_delete_helper (sp, sp->root);
+ (*sp->deallocate) ((char*) sp, sp->allocate_data);
+}
+
+/* Insert a new node (associating KEY with DATA) into SP. If a
+ previous node with the indicated KEY exists, its data is replaced
+ with the new value. Returns the new node. */
+
+splay_tree_node
+splay_tree_insert (sp, key, value)
+ splay_tree sp;
+ splay_tree_key key;
+ splay_tree_value value;
+{
+ int comparison = 0;
+
+ splay_tree_splay (sp, key);
+
+ if (sp->root)
+ comparison = compare_uintptr_t (sp->root->key, key);
+
+ if (sp->root && comparison == 0)
+ {
+ /* If the root of the tree already has the indicated KEY, just
+ replace the value with VALUE. */
+ sp->root->value = value;
+ }
+ else
+ {
+ /* Create a new node, and insert it at the root. */
+ splay_tree_node node;
+
+ node = ((splay_tree_node)
+ (*sp->allocate) (sizeof (struct splay_tree_node_s),
+ sp->allocate_data));
+ node->key = key;
+ node->value = value;
+
+ if (!sp->root)
+ node->left = node->right = 0;
+ else if (comparison < 0)
+ {
+ node->left = sp->root;
+ node->right = node->left->right;
+ node->left->right = 0;
+ }
+ else
+ {
+ node->right = sp->root;
+ node->left = node->right->left;
+ node->right->left = 0;
+ }
+
+ sp->root = node;
+ sp->last_splayed_key_p = 0;
+ }
+
+ return sp->root;
+}
+
+/* Remove KEY from SP. It is not an error if it did not exist. */
+
+void
+splay_tree_remove (sp, key)
+ splay_tree sp;
+ splay_tree_key key;
+{
+ splay_tree_splay (sp, key);
+ sp->last_splayed_key_p = 0;
+
+ if (sp->root && compare_uintptr_t (sp->root->key, key) == 0)
+ {
+ splay_tree_node left, right;
+
+ left = sp->root->left;
+ right = sp->root->right;
+
+ /* Delete the root node itself. */
+ (*sp->deallocate) (sp->root, sp->allocate_data);
+
+ /* One of the children is now the root. Doesn't matter much
+ which, so long as we preserve the properties of the tree. */
+ if (left)
+ {
+ sp->root = left;
+
+ /* If there was a right child as well, hang it off the
+ right-most leaf of the left child. */
+ if (right)
+ {
+ while (left->right)
+ left = left->right;
+ left->right = right;
+ }
+ }
+ else
+ sp->root = right;
+ }
+}
+
+/* Lookup KEY in SP, returning VALUE if present, and NULL
+ otherwise. */
+
+splay_tree_node
+splay_tree_lookup (sp, key)
+ splay_tree sp;
+ splay_tree_key key;
+{
+ splay_tree_splay (sp, key);
+
+ if (sp->root && compare_uintptr_t (sp->root->key, key) == 0)
+ return sp->root;
+ else
+ return 0;
+}
+
+/* Return the node in SP with the greatest key. */
+
+splay_tree_node
+splay_tree_max (sp)
+ splay_tree sp;
+{
+ splay_tree_node n = sp->root;
+
+ if (!n)
+ return NULL;
+
+ while (n->right)
+ n = n->right;
+
+ return n;
+}
+
+/* Return the node in SP with the smallest key. */
+
+splay_tree_node
+splay_tree_min (sp)
+ splay_tree sp;
+{
+ splay_tree_node n = sp->root;
+
+ if (!n)
+ return NULL;
+
+ while (n->left)
+ n = n->left;
+
+ return n;
+}
+
+/* Return the immediate predecessor KEY, or NULL if there is no
+ predecessor. KEY need not be present in the tree. */
+
+splay_tree_node
+splay_tree_predecessor (sp, key)
+ splay_tree sp;
+ splay_tree_key key;
+{
+ int comparison;
+ splay_tree_node node;
+
+ /* If the tree is empty, there is certainly no predecessor. */
+ if (!sp->root)
+ return NULL;
+
+ /* Splay the tree around KEY. That will leave either the KEY
+ itself, its predecessor, or its successor at the root. */
+ splay_tree_splay (sp, key);
+ comparison = compare_uintptr_t (sp->root->key, key);
+
+ /* If the predecessor is at the root, just return it. */
+ if (comparison < 0)
+ return sp->root;
+
+ /* Otherwise, find the rightmost element of the left subtree. */
+ node = sp->root->left;
+ if (node)
+ while (node->right)
+ node = node->right;
+
+ return node;
+}
+
+/* Return the immediate successor KEY, or NULL if there is no
+ successor. KEY need not be present in the tree. */
+
+splay_tree_node
+splay_tree_successor (sp, key)
+ splay_tree sp;
+ splay_tree_key key;
+{
+ int comparison;
+ splay_tree_node node;
+
+ /* If the tree is empty, there is certainly no successor. */
+ if (!sp->root)
+ return NULL;
+
+ /* Splay the tree around KEY. That will leave either the KEY
+ itself, its predecessor, or its successor at the root. */
+ splay_tree_splay (sp, key);
+ comparison = compare_uintptr_t (sp->root->key, key);
+
+ /* If the successor is at the root, just return it. */
+ if (comparison > 0)
+ return sp->root;
+
+ /* Otherwise, find the leftmost element of the right subtree. */
+ node = sp->root->right;
+ if (node)
+ while (node->left)
+ node = node->left;
+
+ return node;
+}
+
+/* Call FN, passing it the DATA, for every node in SP, following an
+ in-order traversal. If FN every returns a non-zero value, the
+ iteration ceases immediately, and the value is returned.
+ Otherwise, this function returns 0. */
+
+int
+splay_tree_foreach (sp, fn, data)
+ splay_tree sp;
+ splay_tree_foreach_fn fn;
+ void *data;
+{
+ return splay_tree_foreach_helper (sp, sp->root, fn, data);
+}
--- /dev/null
+/* A splay-tree datatype.
+ Copyright 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
+ Contributed by Mark Mitchell (mark@markmitchell.com).
+ Adapted for libmudflap from libiberty.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GCC 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING. If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* For an easily readable description of splay-trees, see:
+
+ Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
+ Algorithms. Harper-Collins, Inc. 1991.
+
+ The major feature of splay trees is that all basic tree operations
+ are amortized O(log n) time for a tree with n nodes. */
+
+#ifndef _SPLAY_TREE_H
+#define _SPLAY_TREE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define PARAMS(X) X
+#define PTR void *
+#define ATTRIBUTE_UNUSED __attribute__((__unused__))
+
+#ifndef GTY
+#define GTY(X)
+#endif
+
+/* Use typedefs for the key and data types to facilitate changing
+ these types, if necessary. These types should be sufficiently wide
+ that any pointer or scalar can be cast to these types, and then
+ cast back, without loss of precision. */
+typedef uintptr_t splay_tree_key;
+typedef void *splay_tree_value;
+
+/* Forward declaration for a node in the tree. */
+typedef struct splay_tree_node_s *splay_tree_node;
+
+/* The type of a function used to iterate over the tree. */
+typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*));
+
+/* The type of a function used to allocate memory for tree root and
+ node structures. The first argument is the number of bytes needed;
+ the second is a data pointer the splay tree functions pass through
+ to the allocator. This function must never return zero. */
+typedef PTR (*splay_tree_allocate_fn) PARAMS((int, void *));
+
+/* The type of a function used to free memory allocated using the
+ corresponding splay_tree_allocate_fn. The first argument is the
+ memory to be freed; the latter is a data pointer the splay tree
+ functions pass through to the freer. */
+typedef void (*splay_tree_deallocate_fn) PARAMS((void *, void *));
+
+/* The nodes in the splay tree. */
+struct splay_tree_node_s GTY(())
+{
+ /* The key. */
+ splay_tree_key GTY ((use_param1)) key;
+
+ /* The value. */
+ splay_tree_value GTY ((use_param2)) value;
+
+ /* The left and right children, respectively. */
+ splay_tree_node GTY ((use_params)) left;
+ splay_tree_node GTY ((use_params)) right;
+};
+
+/* The splay tree itself. */
+struct splay_tree_s GTY(())
+{
+ /* The root of the tree. */
+ splay_tree_node GTY ((use_params)) root;
+
+ /* Allocate/free functions, and a data pointer to pass to them. */
+ splay_tree_allocate_fn allocate;
+ splay_tree_deallocate_fn deallocate;
+ PTR GTY((skip)) allocate_data;
+
+ /* The last key value for which the tree has been splayed, but not
+ since modified. */
+ splay_tree_key GTY ((use_param1)) last_splayed_key;
+ int last_splayed_key_p;
+};
+typedef struct splay_tree_s *splay_tree;
+
+extern splay_tree splay_tree_new PARAMS((void));
+extern void splay_tree_delete PARAMS((splay_tree));
+extern splay_tree_node splay_tree_insert
+ PARAMS((splay_tree,
+ splay_tree_key,
+ splay_tree_value));
+extern void splay_tree_remove PARAMS((splay_tree,
+ splay_tree_key));
+extern splay_tree_node splay_tree_lookup
+ PARAMS((splay_tree,
+ splay_tree_key));
+extern splay_tree_node splay_tree_predecessor
+ PARAMS((splay_tree,
+ splay_tree_key));
+extern splay_tree_node splay_tree_successor
+ PARAMS((splay_tree,
+ splay_tree_key));
+extern splay_tree_node splay_tree_max
+ PARAMS((splay_tree));
+extern splay_tree_node splay_tree_min
+ PARAMS((splay_tree));
+extern int splay_tree_foreach PARAMS((splay_tree,
+ splay_tree_foreach_fn,
+ void*));
+extern int splay_tree_compare_ints PARAMS((splay_tree_key,
+ splay_tree_key));
+extern int splay_tree_compare_pointers PARAMS((splay_tree_key,
+ splay_tree_key));
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _SPLAY_TREE_H */
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