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[multiple changes]

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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
This commit is contained in:
Frank Ch. Eigler 2004-06-29 22:30:53 +00:00 • committed by Frank Ch. Eigler
parent ef558756f2
commit dfdf6a9440
8 changed files with 674 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
libmudflap/ChangeLog
View file

@ -1,3 +1,14 @@
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>
* configure.ac (AC_CHECK_HEADERS): Add dirent.h

9
libmudflap/Makefile.am
View file

@ -20,14 +20,6 @@ endif
toolexeclib_LTLIBRARIES = libmudflap.la $(libmudflapth)
include_HEADERS = mf-runtime.h
# Copy this out of libiberty's source tree, so it can be built here via libtool
splay-tree.c:
rm -f $@
$(LN_S) $(srcdir)/../libiberty/splay-tree.c $@
# Copy this so that top-level include/ does not have to be put into -I path
splay-tree.h:
rm -f $@
$(LN_S) $(srcdir)/../include/splay-tree.h $@
libmudflap_la_SOURCES = \
mf-runtime.c \
@ -40,7 +32,6 @@ libmudflap_la_DEPENDENCIES = $(libmudflap_la_LIBADD)
clean-local:
rm -f pth/*.o pth/*.lo
rm -f splay-tree.c splay-tree.h
pth/mf-runtime.lo: mf-runtime.c mf-runtime.h mf-impl.h splay-tree.c splay-tree.h
$(LTCOMPILE) -DLIBMUDFLAPTH -c $(srcdir)/mf-runtime.c -o $@

10
libmudflap/Makefile.in
View file

@ -817,20 +817,10 @@ uninstall-info: uninstall-info-recursive
uninstall uninstall-am uninstall-includeHEADERS \
uninstall-info-am uninstall-toolexeclibLTLIBRARIES
# Copy this out of libiberty's source tree, so it can be built here via libtool
splay-tree.c:
rm -f $@
$(LN_S) $(srcdir)/../libiberty/splay-tree.c $@
# Copy this so that top-level include/ does not have to be put into -I path
splay-tree.h:
rm -f $@
$(LN_S) $(srcdir)/../include/splay-tree.h $@
mf-runtime.lo: mf-runtime.c splay-tree.c splay-tree.h
clean-local:
rm -f pth/*.o pth/*.lo
rm -f splay-tree.c splay-tree.h
pth/mf-runtime.lo: mf-runtime.c mf-runtime.h mf-impl.h splay-tree.c splay-tree.h
$(LTCOMPILE) -DLIBMUDFLAPTH -c $(srcdir)/mf-runtime.c -o $@

4
libmudflap/ansidecl.h
View file

@ -1,4 +0,0 @@
/* A minimal ansidecl.h file for use by splay-tree only. */
#define PARAMS(X) X
#define PTR void *
#define ATTRIBUTE_UNUSED __attribute__((__unused__))

1
libmudflap/libiberty.h
View file

@ -1 +0,0 @@
/* Placeholder for splay-tree use only. */

4
libmudflap/mf-runtime.c
View file

@ -610,7 +610,7 @@ __mf_object_tree (int type)
static splay_tree trees [__MF_TYPE_MAX+1];
assert (type >= 0 && type <= __MF_TYPE_MAX);
if (UNLIKELY (trees[type] == NULL))
trees[type] = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
trees[type] = splay_tree_new ();
return trees[type];
}
@ -1390,7 +1390,7 @@ __mf_find_objects2 (uintptr_t ptr_low, uintptr_t ptr_high,
{
__mf_object_t *obj;
n = (direction == 0 ? splay_tree_predecessor (t, k) : splay_tree_successor (t, k));
n = (direction == 0 ? splay_tree_successor (t, k) : splay_tree_predecessor (t, k));
if (n == NULL) break;
obj = (__mf_object_t *) n->value;

525
libmudflap/splay-tree.c Normal file
View file

@ -0,0 +1,525 @@
/* 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);
}

136
libmudflap/splay-tree.h Normal file
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@ -0,0 +1,136 @@
/* 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 */