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Allow the user to specify functions for allocating memory for
splay tree roots and nodes.
* splay-tree.h (splay_tree_allocate_fn, splay_tree_deallocate_fn):
New types.
(splay_tree): New fields: `allocate', `deallocate', and
`allocate_data'.
(splay_tree_new_with_allocator): New function declaration.

libiberty:

* splay-tree.c (splay_tree_xmalloc_allocate,
splay_tree_xmalloc_deallocate): New functions.
(splay_tree_new): Call splay_tree_new_with_allocator, passing the
above functions and a dummy data pointer.
(splay_tree_new_with_allocator): New function.
(splay_tree_delete_helper, splay_tree_delete, splay_tree_insert,
splay_tree_remove): Use the splay tree's allocation and
deallocation functions.
This commit is contained in:
Jim Blandy
2002-02-21 22:19:14 +00:00
parent 9abe545046
commit 2bbcdae974
4 changed files with 94 additions and 6 deletions
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54
libiberty/splay-tree.c
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@@ -70,7 +70,7 @@ splay_tree_delete_helper (sp, node)
if (sp->delete_value)
(*sp->delete_value)(node->value);
free ((char*) node);
(*sp->deallocate) ((char*) node, sp->allocate_data);
}
/* Help splay SP around KEY. PARENT and GRANDPARENT are the parent
@@ -227,9 +227,25 @@ splay_tree_foreach_helper (sp, node, fn, data)
return splay_tree_foreach_helper (sp, node->right, fn, data);
}
/* An allocator and deallocator based on xmalloc. */
static void *
splay_tree_xmalloc_allocate (int size, void *data)
{
return xmalloc (size);
}
static void
splay_tree_xmalloc_deallocate (void *object, void *data)
{
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. */
values. Use xmalloc to allocate the splay tree structure, and any
nodes added. */
splay_tree
splay_tree_new (compare_fn, delete_key_fn, delete_value_fn)
@@ -237,11 +253,35 @@ splay_tree_new (compare_fn, delete_key_fn, delete_value_fn)
splay_tree_delete_key_fn delete_key_fn;
splay_tree_delete_value_fn delete_value_fn;
{
splay_tree sp = (splay_tree) xmalloc (sizeof (struct splay_tree_s));
return (splay_tree_new_with_allocator
(compare_fn, delete_key_fn, delete_value_fn,
splay_tree_xmalloc_allocate, splay_tree_xmalloc_deallocate, 0));
}
/* Allocate a new splay tree, using COMPARE_FN to compare nodes,
DELETE_KEY_FN to deallocate keys, and DELETE_VALUE_FN to deallocate
values. */
splay_tree
splay_tree_new_with_allocator (compare_fn, delete_key_fn, delete_value_fn,
allocate_fn, deallocate_fn, allocate_data)
splay_tree_compare_fn compare_fn;
splay_tree_delete_key_fn delete_key_fn;
splay_tree_delete_value_fn delete_value_fn;
splay_tree_allocate_fn allocate_fn;
splay_tree_deallocate_fn deallocate_fn;
void *allocate_data;
{
splay_tree sp = (splay_tree) (*allocate_fn) (sizeof (struct splay_tree_s),
allocate_data);
sp->root = 0;
sp->comp = compare_fn;
sp->delete_key = delete_key_fn;
sp->delete_value = delete_value_fn;
sp->allocate = allocate_fn;
sp->deallocate = deallocate_fn;
sp->allocate_data = allocate_data;
return sp;
}
@@ -253,7 +293,7 @@ splay_tree_delete (sp)
splay_tree sp;
{
splay_tree_delete_helper (sp, sp->root);
free ((char*) sp);
(*sp->deallocate) ((char*) sp, sp->allocate_data);
}
/* Insert a new node (associating KEY with DATA) into SP. If a
@@ -286,7 +326,9 @@ splay_tree_insert (sp, key, value)
/* Create a new node, and insert it at the root. */
splay_tree_node node;
node = (splay_tree_node) xmalloc (sizeof (struct splay_tree_node_s));
node = ((splay_tree_node)
(*sp->allocate) (sizeof (struct splay_tree_node_s),
sp->allocate_data));
node->key = key;
node->value = value;
@@ -330,7 +372,7 @@ splay_tree_remove (sp, key)
/* Delete the root node itself. */
if (sp->delete_value)
(*sp->delete_value) (sp->root->value);
free (sp->root);
(*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. */