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rbtree.h: Use parent pointer instead of stack in wine_rb_postorder. 

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2016-08-15 21:53:26 +02:00 committed by Alexandre Julliard
parent 256f55e75b
commit 20740d849e
1 changed files with 22 additions and 29 deletions
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51
include/wine/rbtree.h
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@ -59,8 +59,6 @@ typedef void (wine_rb_traverse_func_t)(struct wine_rb_entry *entry, void *contex
#define WINE_RB_FLAG_RED 0x1
#define WINE_RB_FLAG_STOP 0x2
#define WINE_RB_FLAG_TRAVERSED_LEFT 0x4
#define WINE_RB_FLAG_TRAVERSED_RIGHT 0x8
static inline void wine_rb_stack_clear(struct wine_rb_stack *stack)
{
@ -185,37 +183,32 @@ static inline void wine_rb_move_red_right(struct wine_rb_tree *tree, struct wine
}
}
static inline struct wine_rb_entry *wine_rb_postorder_head(struct wine_rb_entry *iter)
{
if (!iter) return NULL;
for (;;) {
while (iter->left) iter = iter->left;
if (!iter->right) return iter;
iter = iter->right;
}
}
static inline struct wine_rb_entry *wine_rb_postorder_next(struct wine_rb_entry *iter)
{
if (!iter->parent) return NULL;
if (iter == iter->parent->right || !iter->parent->right) return iter->parent;
return wine_rb_postorder_head(iter->parent->right);
}
static inline void wine_rb_postorder(struct wine_rb_tree *tree, wine_rb_traverse_func_t *callback, void *context)
{
struct wine_rb_entry **entry;
struct wine_rb_entry *iter, *next;
if (!tree->root) return;
for (entry = &tree->root;;)
for (iter = wine_rb_postorder_head(tree->root); iter; iter = next)
{
struct wine_rb_entry *e = *entry;
if (e->left && !(e->flags & WINE_RB_FLAG_TRAVERSED_LEFT))
{
wine_rb_stack_push(&tree->stack, entry);
e->flags |= WINE_RB_FLAG_TRAVERSED_LEFT;
entry = &e->left;
continue;
}
if (e->right && !(e->flags & WINE_RB_FLAG_TRAVERSED_RIGHT))
{
wine_rb_stack_push(&tree->stack, entry);
e->flags |= WINE_RB_FLAG_TRAVERSED_RIGHT;
entry = &e->right;
continue;
}
e->flags &= ~(WINE_RB_FLAG_TRAVERSED_LEFT | WINE_RB_FLAG_TRAVERSED_RIGHT);
callback(e, context);
if (!tree->stack.count) break;
entry = tree->stack.entries[--tree->stack.count];
next = wine_rb_postorder_next(iter);
callback(iter, context);
}
}