dfdf6a9440
2004-06-29 Frank Ch. Eigler <fche@redhat.com> Splay tree implementation fork. * splay-tree.c, splay-tree.h: Copied & modified from libiberty. Use hard-coded comparison function for uintptr_t. Remove key/value deallocation logic. Cache last splayed key for consecutive lookups. * Makefile.am, Makefile.in: Use them, don't link to them. * mf-runtime.c (__mf_object_tree): Adapt to simpler splay_tree_new. (__mf_find_objects2): Flip successor/predecessor search sequence. * ansidecl.h, libiberty.h: Removed dummy files. 2004-06-29 Nick Clifton <nickc@redhat.com> From-SVN: r83879
137 lines
4.7 KiB
C
137 lines
4.7 KiB
C
/* A splay-tree datatype.
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Copyright 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
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Contributed by Mark Mitchell (mark@markmitchell.com).
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Adapted for libmudflap from libiberty.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* For an easily readable description of splay-trees, see:
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Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
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Algorithms. Harper-Collins, Inc. 1991.
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The major feature of splay trees is that all basic tree operations
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are amortized O(log n) time for a tree with n nodes. */
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#ifndef _SPLAY_TREE_H
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#define _SPLAY_TREE_H
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define PARAMS(X) X
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#define PTR void *
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#define ATTRIBUTE_UNUSED __attribute__((__unused__))
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#ifndef GTY
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#define GTY(X)
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#endif
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/* Use typedefs for the key and data types to facilitate changing
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these types, if necessary. These types should be sufficiently wide
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that any pointer or scalar can be cast to these types, and then
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cast back, without loss of precision. */
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typedef uintptr_t splay_tree_key;
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typedef void *splay_tree_value;
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/* Forward declaration for a node in the tree. */
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typedef struct splay_tree_node_s *splay_tree_node;
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/* The type of a function used to iterate over the tree. */
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typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*));
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/* The type of a function used to allocate memory for tree root and
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node structures. The first argument is the number of bytes needed;
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the second is a data pointer the splay tree functions pass through
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to the allocator. This function must never return zero. */
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typedef PTR (*splay_tree_allocate_fn) PARAMS((int, void *));
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/* The type of a function used to free memory allocated using the
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corresponding splay_tree_allocate_fn. The first argument is the
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memory to be freed; the latter is a data pointer the splay tree
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functions pass through to the freer. */
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typedef void (*splay_tree_deallocate_fn) PARAMS((void *, void *));
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/* The nodes in the splay tree. */
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struct splay_tree_node_s GTY(())
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{
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/* The key. */
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splay_tree_key GTY ((use_param1)) key;
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/* The value. */
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splay_tree_value GTY ((use_param2)) value;
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/* The left and right children, respectively. */
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splay_tree_node GTY ((use_params)) left;
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splay_tree_node GTY ((use_params)) right;
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};
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/* The splay tree itself. */
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struct splay_tree_s GTY(())
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{
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/* The root of the tree. */
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splay_tree_node GTY ((use_params)) root;
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/* Allocate/free functions, and a data pointer to pass to them. */
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splay_tree_allocate_fn allocate;
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splay_tree_deallocate_fn deallocate;
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PTR GTY((skip)) allocate_data;
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/* The last key value for which the tree has been splayed, but not
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since modified. */
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splay_tree_key GTY ((use_param1)) last_splayed_key;
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int last_splayed_key_p;
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};
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typedef struct splay_tree_s *splay_tree;
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extern splay_tree splay_tree_new PARAMS((void));
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extern void splay_tree_delete PARAMS((splay_tree));
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extern splay_tree_node splay_tree_insert
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PARAMS((splay_tree,
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splay_tree_key,
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splay_tree_value));
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extern void splay_tree_remove PARAMS((splay_tree,
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splay_tree_key));
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extern splay_tree_node splay_tree_lookup
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PARAMS((splay_tree,
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splay_tree_key));
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extern splay_tree_node splay_tree_predecessor
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PARAMS((splay_tree,
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splay_tree_key));
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extern splay_tree_node splay_tree_successor
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PARAMS((splay_tree,
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splay_tree_key));
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extern splay_tree_node splay_tree_max
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PARAMS((splay_tree));
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extern splay_tree_node splay_tree_min
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PARAMS((splay_tree));
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extern int splay_tree_foreach PARAMS((splay_tree,
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splay_tree_foreach_fn,
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void*));
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extern int splay_tree_compare_ints PARAMS((splay_tree_key,
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splay_tree_key));
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extern int splay_tree_compare_pointers PARAMS((splay_tree_key,
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splay_tree_key));
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _SPLAY_TREE_H */
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