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splay-tree.h (splay_tree_predecessor): Declare.

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* splay-tree.h (splay_tree_predecessor): Declare.

	* splay-tree.c (splay_tree_predecessor): New function.
	(splay_tree_successor): Likewise.

From-SVN: r36304
This commit is contained in:
Mark Mitchell 2000-09-10 21:28:21 +00:00 committed by Mark Mitchell
parent aac02f4e6b
commit 2c9f4db73a
4 changed files with 83 additions and 2 deletions
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4
include/ChangeLog
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@ -1,3 +1,7 @@
2000-09-10 Mark Mitchell <mark@codesourcery.com>
* splay-tree.h (splay_tree_predecessor): Declare.
2000-09-05 John David Anglin <dave@hiauly1.hia.nrc.ca>
* md5.h (md5_uint32): Choose via INT_MAX instead of UINT_MAX.

8
include/splay-tree.h
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@ -1,5 +1,5 @@
/* A splay-tree datatype.
Copyright (C) 1998 Free Software Foundation, Inc.
Copyright (C) 1998, 2000 Free Software Foundation, Inc.
Contributed by Mark Mitchell (mark@markmitchell.com).
This file is part of GNU CC.
@ -104,6 +104,12 @@ extern void splay_tree_remove PARAMS((splay_tree,
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 int splay_tree_foreach PARAMS((splay_tree,
splay_tree_foreach_fn,
void*));

5
libiberty/ChangeLog
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@ -1,3 +1,8 @@
2000-09-10 Mark Mitchell <mark@codesourcery.com>
* splay-tree.c (splay_tree_predecessor): New function.
(splay_tree_successor): Likewise.
2000-09-10 Hans-Peter Nilsson <hp@axis.com>
* testsuite/demangle-expected: Add four tests for type_info

68
libiberty/splay-tree.c
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@ -1,5 +1,5 @@
/* A splay-tree datatype.
Copyright (C) 1998, 1999 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
Contributed by Mark Mitchell (mark@markmitchell.com).
This file is part of GNU CC.
@ -366,6 +366,72 @@ splay_tree_lookup (sp, key)
return 0;
}
/* 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 = (*sp->comp)(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
predecessor. 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 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 = (*sp->comp)(sp->root->key, key);
/* If the successor 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->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.