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splay-tree.c (splay_tree_foreach_helper): Remove arg `sp', all callers updated. 

* splay-tree.c (splay_tree_foreach_helper): Remove arg `sp',
	all callers updated.  Rewrite to be non-recursive.

From-SVN: r167589
This commit is contained in:
Doug Evans 2010-12-08 15:48:50 +00:00 committed by Doug Evans
parent 00c4e97c94
commit 23346f368b
2 changed files with 44 additions and 13 deletions
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5
libiberty/ChangeLog
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@ -1,3 +1,8 @@
2010-12-08 Doug Evans <dje@google.com>
* splay-tree.c (splay_tree_foreach_helper): Remove arg `sp',
all callers updated. Rewrite to be non-recursive.
2010-11-29 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* setproctitle.c [HAVE_SYS_PRCTL_H]: Include <sys/types.h>.

52
libiberty/splay-tree.c
View File

@ -44,7 +44,7 @@ static inline void rotate_left (splay_tree_node *,
static inline void rotate_right (splay_tree_node *,
splay_tree_node, splay_tree_node);
static void splay_tree_splay (splay_tree, splay_tree_key);
static int splay_tree_foreach_helper (splay_tree, splay_tree_node,
static int splay_tree_foreach_helper (splay_tree_node,
splay_tree_foreach_fn, void*);
/* Deallocate NODE (a member of SP), and all its sub-trees. */
@ -204,26 +204,52 @@ splay_tree_splay (splay_tree sp, splay_tree_key key)
value is returned. Otherwise, this function returns 0. */
static int
splay_tree_foreach_helper (splay_tree sp, splay_tree_node node,
splay_tree_foreach_helper (splay_tree_node node,
splay_tree_foreach_fn fn, void *data)
{
int val;
splay_tree_node *stack;
int stack_ptr, stack_size;
if (!node)
return 0;
/* A non-recursive implementation is used to avoid filling the stack
for large trees. Splay trees are worst case O(n) in the depth of
the tree. */
val = splay_tree_foreach_helper (sp, node->left, fn, data);
if (val)
return val;
#define INITIAL_STACK_SIZE 100
stack_size = INITIAL_STACK_SIZE;
stack_ptr = 0;
stack = XNEWVEC (splay_tree_node, stack_size);
val = 0;
val = (*fn)(node, data);
if (val)
return val;
for (;;)
{
while (node != NULL)
{
if (stack_ptr == stack_size)
{
stack_size *= 2;
stack = XRESIZEVEC (splay_tree_node, stack, stack_size);
}
stack[stack_ptr++] = node;
node = node->left;
}
return splay_tree_foreach_helper (sp, node->right, fn, data);
if (stack_ptr == 0)
break;
node = stack[--stack_ptr];
val = (*fn) (node, data);
if (val)
break;
node = node->right;
}
XDELETEVEC (stack);
return val;
}
/* An allocator and deallocator based on xmalloc. */
static void *
splay_tree_xmalloc_allocate (int size, void *data ATTRIBUTE_UNUSED)
@ -537,7 +563,7 @@ splay_tree_successor (splay_tree sp, splay_tree_key key)
int
splay_tree_foreach (splay_tree sp, splay_tree_foreach_fn fn, void *data)
{
return splay_tree_foreach_helper (sp, sp->root, fn, data);
return splay_tree_foreach_helper (sp->root, fn, data);
}
/* Splay-tree comparison function, treating the keys as ints. */