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authorSverker Eriksson <[email protected]>2013-09-03 17:18:34 +0200
committerSverker Eriksson <[email protected]>2013-09-30 17:45:45 +0200
commit0d9c5c44a46810f0d9f45a533ca8a3754c11c643 (patch)
tree53c31ee62a1685d41120a45e19d3b8926c4c244c /erts/emulator/sys
parent9fe8915784a23622577a8bc8604e809d34623c94 (diff)
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erts: Use rbt_foreach_node to check_tree
Diffstat (limited to 'erts/emulator/sys')
-rw-r--r--erts/emulator/sys/common/erl_mmap.c161
1 files changed, 58 insertions, 103 deletions
diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index 5624ec9813..2d749b2402 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -772,6 +772,8 @@ rbt_foreach_node(RBTree* tree,
Sint blacks = -1;
Sint curr_blacks = 1;
Uint depth = 1;
+ Uint max_depth = 0;
+ Uint node_cnt = 0;
#endif
enum { RECURSE_LEFT, DO_NODE, RECURSE_RIGHT, RETURN_TO_PARENT }state;
RBTNode *x = tree->root;
@@ -803,7 +805,12 @@ rbt_foreach_node(RBTree* tree,
break;
case DO_NODE:
- (*fn) (x, arg);
+ #ifdef HARD_DEBUG
+ ++node_cnt;
+ if (depth > max_depth)
+ max_depth = depth;
+ #endif
+ (*fn) (x, arg); /* Do it! */
state = reverse ? RECURSE_LEFT : RECURSE_RIGHT;
break;
@@ -847,6 +854,11 @@ rbt_foreach_node(RBTree* tree,
break;
}
}
+#ifdef HARD_DEBUG
+ RBT_ASSERT(depth == 0 || (!tree->root && depth==1));
+ RBT_ASSERT(curr_blacks == 0);
+ RBT_ASSERT((1 << (max_depth/2)) <= node_cnt);
+#endif
}
@@ -1947,127 +1959,70 @@ static void print_tree(enum SortOrder order, RBTNode*);
*
*/
+struct check_arg_t {
+ RBTree* tree;
+ ErtsFreeSegDesc* prev_seg;
+ Uint size;
+ RBTNode *res;
+};
+static void check_node(RBTNode* x, void* arg);
+
+
static RBTNode *
check_tree(RBTree* tree, Uint size)
{
- RBTNode *res = NULL;
- Sint blacks;
- Sint curr_blacks;
- RBTNode *x;
- Uint depth, max_depth, node_cnt;
- ErtsFreeSegDesc* seg = NULL;
- ErtsFreeSegDesc* prev_seg = NULL;
- enum { RECURSE_LEFT, CHECK_NODE, RECURSE_RIGHT, RETURN_TO_PARENT }state;
+ struct check_arg_t carg;
+ carg.tree = tree;
+ carg.prev_seg = NULL;
+ carg.size = size;
+ carg.res = NULL;
#ifdef PRINT_TREE
print_tree(tree->order, tree->root);
#endif
if (!tree->root)
- return res;
+ return NULL;
- x = tree->root;
- RBT_ASSERT(IS_BLACK(x));
- RBT_ASSERT(!parent(x));
- curr_blacks = 1;
- blacks = -1;
- depth = 1;
- max_depth = 0;
- node_cnt = 0;
- state = RECURSE_LEFT;
-
- /* Traverse tree in sorting order */
- while (x) {
- switch (state) {
- case RECURSE_LEFT:
- if (x->left) {
- RBT_ASSERT(parent(x->left) == x);
- x = x->left;
- ++depth;
- if (IS_BLACK(x))
- curr_blacks++;
- state = RECURSE_LEFT;
- }
- else {
- if (blacks < 0)
- blacks = curr_blacks;
- RBT_ASSERT(blacks == curr_blacks);
- state = CHECK_NODE;
- }
- break;
+ RBT_ASSERT(IS_BLACK(tree->root));
+ RBT_ASSERT(!parent(tree->root));
- case CHECK_NODE:
- ++node_cnt;
- if (depth > max_depth)
- max_depth = depth;
+ rbt_foreach_node(tree, check_node, &carg, 0);
- if (IS_RED(x)) {
- RBT_ASSERT(IS_BLACK(x->right));
- RBT_ASSERT(IS_BLACK(x->left));
- }
+ return carg.res;
+}
- RBT_ASSERT(parent(x) || x == tree->root);
+/* callback */
+static void check_node(RBTNode* x, void* arg)
+{
+ struct check_arg_t* a = (struct check_arg_t*) arg;
+ ErtsFreeSegDesc* seg;
- if (x->left) {
- RBT_ASSERT(cmp_blocks(tree->order, x->left, x) < 0);
- }
- if (x->right) {
- RBT_ASSERT(cmp_blocks(tree->order, x->right, x) > 0);
- }
+ if (IS_RED(x)) {
+ RBT_ASSERT(IS_BLACK(x->right));
+ RBT_ASSERT(IS_BLACK(x->left));
+ }
- seg = node_to_desc(tree->order, x);
- RBT_ASSERT(seg->start < seg->end);
- if (size && (seg->end - seg->start) >= size) {
- if (!res || cmp_blocks(tree->order, x, res) < 0) {
- res = x;
- }
- }
- if (tree->order == ADDR_ORDER) {
- RBT_ASSERT(!prev_seg || prev_seg->end < seg->start);
- prev_seg = seg;
- }
- state = RECURSE_RIGHT;
- break;
+ RBT_ASSERT(parent(x) || x == a->tree->root);
- case RECURSE_RIGHT:
- if (x->right) {
- RBT_ASSERT(parent(x->right) == x);
- x = x->right;
- ++depth;
- if (IS_BLACK(x))
- curr_blacks++;
- state = RECURSE_LEFT;
- }
- else {
- if (blacks < 0)
- blacks = curr_blacks;
- RBT_ASSERT(blacks == curr_blacks);
- state = RETURN_TO_PARENT;
- }
- break;
+ if (x->left) {
+ RBT_ASSERT(cmp_blocks(a->tree->order, x->left, x) < 0);
+ }
+ if (x->right) {
+ RBT_ASSERT(cmp_blocks(a->tree->order, x->right, x) > 0);
+ }
- case RETURN_TO_PARENT:
- if (parent(x)) {
- if (x == parent(x)->left) {
- state = CHECK_NODE;
- }
- else {
- RBT_ASSERT(x == parent(x)->right);
- state = RETURN_TO_PARENT;
- }
- }
- if (IS_BLACK(x))
- curr_blacks--;
- x = parent(x);
- --depth;
- break;
+ seg = node_to_desc(a->tree->order, x);
+ RBT_ASSERT(seg->start < seg->end);
+ if (a->size && (seg->end - seg->start) >= a->size) {
+ if (!a->res || cmp_blocks(a->tree->order, x, a->res) < 0) {
+ a->res = x;
}
}
- RBT_ASSERT(depth == 0 || (!tree->root && depth==1));
- RBT_ASSERT(curr_blacks == 0);
- RBT_ASSERT((1 << (max_depth/2)) <= node_cnt);
-
- return res;
+ if (a->tree->order == ADDR_ORDER) {
+ RBT_ASSERT(!a->prev_seg || a->prev_seg->end < seg->start);
+ a->prev_seg = seg;
+ }
}
#endif /* HARD_DEBUG */