rm cap, s/len/size/g in sle; comments; cmp fn type; contains api; dot fixes
This commit is contained in:
parent
7c4789e71d
commit
5481b99725
527
include/sl.h
527
include/sl.h
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@ -132,18 +132,26 @@
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*/
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/*
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* Skiplist declarations.
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* Skip List declarations.
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*/
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#ifndef SKIPLIST_MAX_HEIGHT
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#define SKIPLIST_MAX_HEIGHT 1
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#endif
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/*
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* A Skip List contains elements, a portion of which is used to manage those
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* elements while the rest is defined by the use case for this declaration. The
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* house keeping portion is the SKIPLIST_ENTRY below. It maintains the array of
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* forward pointers to nodes and has a height (a zero-based count of levels, so
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* a height of `0` means one (1) level and a height of `4` means five (5)
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* levels).
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*/
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#define SKIPLIST_ENTRY(type) \
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struct __skiplist_entry { \
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struct __skiplist_idx { \
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struct type *prev, **next; \
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size_t cap, len; \
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size_t height; \
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} sle; \
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}
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@ -152,15 +160,65 @@
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*/
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#define SKIP_FIRST(head) ((head)->slh_head)
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#define SKIP_LAST(head) ((head)->slh_tail)
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#define SKIP_NEXT(elm, field) ((elm)->field.sle.next[0])
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#define SKIP_PREV(elm, field) ((elm)->field.sle.prev)
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#define SKIP_EMPTY(head) ((head)->length == 0)
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/*
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* Skip List functions.
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* Skip List node comparison function. This macro builds a function used when
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* comparing two nodes for equality. A portion of this function, `fn_blk`, is
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* the code you supply to compare two nodes as a block (starts with `{`, your
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* code, then `}`) that should compare the node referenced by `a` to the node
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* `b` as follows:
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*
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* When:
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* *a < *b : return -1
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* *a == *b : return 0
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* *a > *b : return 1
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*
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* As stated earlier, the ordered skiplist relies on a well-behaved comparison
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* function. Specifically, given some ordering function f(a, b), it must satisfy
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* the following properties:
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*
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* 1) Be well defined: f(a, b) should always return the same value
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* 2) Be anti-symmetric: f(a, b) == Greater if and only if f(b, a) == Less, and
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* f(a, b) == Equal == f(b, a).
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* 3) Be transitive: If f(a, b) == Greater and f(b, c) == Greater then f(a, c)
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* == Greater.
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*
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* Failure to satisfy these properties can result in unexpected behavior at
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* best, and at worst will cause a segfault, null deref, or some other bad
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* behavior.
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*
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* Example for nodes with keys that are signed integeters (`int`):
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* {
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* (void)list;
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* (void)aux;
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* if (a->key < b->key)
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* return -1;
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* if (a->key > b->key)
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* return 1;
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* return 0;
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* }
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*
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* Note that the comparison function can also make use of the reference to the
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* list as well as a reference to a variable `aux` that you can point to
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* anything else required to perform your comparison. The auxiliary pointer
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* is unused for other purposes. You could even use it a pointer to a function
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* that chooses the proper comparison function for the two nodes in question.
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*
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* Example where the value of `decl` below is `ex`:
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* {
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* // Cast `aux` to a function that returns a function that properly compares
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* // `a` and `b`, for example if they were objects or different structs.
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* (skip_ex_cmp_t *(fn)(ex_node_t *, ex_node_t *)) =
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* (skip_ex_cmp_t *()(ex_node_t *, ex_node_t *))aux;
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*
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* // Use the `fn` pointed to by `aux` to get the comparison function.
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* skip_ex_cmp_t *cmp = fn(a, b);
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*
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* // Now call that function and return the proper result.
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* return cmp(list, a, b, aux);
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* }
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*/
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#define SKIP_COMPARATOR(list, type, fn) \
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#define SKIP_COMPARATOR(list, type, fn_blk) \
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int __skip_cmp_##type(struct list *head, struct type *a, struct type *b, void *aux) \
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{ \
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if (a == b) \
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@ -169,15 +227,18 @@
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return -1; \
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if (a == (head)->slh_tail || b == (head)->slh_head) \
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return 1; \
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fn \
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fn_blk \
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}
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/*
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* Skip List declarations and access methods.
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*/
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#define SKIPLIST_DECL(decl, prefix, field, free_node_blk, update_node_blk, snap_node_blk, sizeof_entry_blk) \
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\
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/* Skiplist node type */ \
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/* Skip List node type */ \
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typedef struct decl##_node decl##_node_t; \
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\
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/* Skiplist type */ \
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/* Skip List structure and type */ \
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typedef struct decl { \
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size_t level, length, max; \
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int (*cmp)(struct decl *, decl##_node_t *, decl##_node_t *, void *); \
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@ -186,27 +247,23 @@
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decl##_node_t *slh_tail; \
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} decl##_t; \
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\
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/* Snapshot of a Skiplist */ \
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/* Snapshot of a Skip List */ \
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typedef struct decl##_snap { \
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decl##_t list; \
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decl##_node_t *nodes; \
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size_t bytes; \
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} decl##_snap_t; \
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\
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/* Path taken to find an element in the Skiplist, path[0] is the match if \
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one exists */ \
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struct __##decl##_path { \
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size_t cap; \
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size_t len; \
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struct decl##_node **nodes; \
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}; \
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/* Skip List comparison function type */ \
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typedef int (*skip_##decl##_cmp_t)(decl##_t *, decl##_node_t *, decl##_node_t *, void *); \
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\
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/* Used when positioning a cursor within a Skip List. */ \
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typedef enum { SKIP_EQ = 0, SKIP_LTE = -1, SKIP_LT = -2, SKIP_GTE = 1, SKIP_GT = 2 } skip_pos_##decl_t; \
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\
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/* -- __skip_key_compare_ \
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* \
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* This function takes four arguments: \
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* - a reference to the Skiplist \
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* - a reference to the Skip List \
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* - the two nodes to compare, `a` and `b` \
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* - `aux` an additional auxiliary argument \
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* and returns: \
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@ -227,7 +284,7 @@
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\
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/* -- __skip_toss_ \
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* A "coin toss" function that is critical to the proper operation of the \
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* Skiplist. For example, when `max = 6` this function returns 0 with \
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* Skip List. For example, when `max = 6` this function returns 0 with \
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* probability 0.5, 1 with 0.25, 2 with 0.125, etc. until 6 with 0.5^7. \
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*/ \
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static int __skip_toss_##decl(size_t max) \
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@ -253,8 +310,7 @@
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n = (decl##_node_t *)calloc(1, sizeof(decl##_node_t) + sle_arr_sz); \
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if (n == NULL) \
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return ENOMEM; \
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n->field.sle.cap = slist->max; \
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n->field.sle.len = 0; \
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n->field.sle.height = 0; \
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n->field.sle.next = (decl##_node_t **)((uintptr_t)n + sizeof(decl##_node_t)); \
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*node = n; \
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return 0; \
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@ -281,12 +337,12 @@
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if (rc) \
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goto fail; \
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\
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slist->slh_head->field.sle.len = 0; \
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slist->slh_head->field.sle.height = 0; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_head->field.sle.next[i] = slist->slh_tail; \
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slist->slh_head->field.sle.prev = NULL; \
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\
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slist->slh_tail->field.sle.len = slist->max; \
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slist->slh_tail->field.sle.height = slist->max; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_tail->field.sle.next[i] = NULL; \
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slist->slh_tail->field.sle.prev = slist->slh_head; \
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@ -349,7 +405,7 @@
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return 0; \
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\
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/* Find the node that matches `node` or NULL. */ \
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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elm = elm->field.sle.next[i]; \
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@ -388,9 +444,9 @@
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return -1; \
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} \
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level = __skip_toss_##decl(slist->max - 1); \
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n->field.sle.len = level + 1; \
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n->field.sle.height = level + 1; \
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for (i = 0; i <= level; i++) { \
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if (i <= slist->slh_head->field.sle.len) { \
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if (i <= slist->slh_head->field.sle.height) { \
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n->field.sle.next[i] = path[i + 1]->field.sle.next[i]; \
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path[i + 1]->field.sle.next[i] = n; \
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} else { \
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@ -402,9 +458,9 @@
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if (n->field.sle.next[0] == slist->slh_tail) { \
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slist->slh_tail->field.sle.prev = n; \
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} \
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if (level > slist->slh_head->field.sle.len) { \
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slist->slh_head->field.sle.len = level; \
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slist->slh_tail->field.sle.len = level; \
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if (level > slist->slh_head->field.sle.height) { \
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slist->slh_head->field.sle.height = level; \
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slist->slh_tail->field.sle.height = level; \
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} \
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slist->length++; \
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\
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@ -441,7 +497,7 @@
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if (slist == NULL || n == NULL) \
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return NULL; \
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\
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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\
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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@ -471,7 +527,7 @@
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if (slist == NULL || n == NULL) \
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return NULL; \
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\
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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\
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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@ -501,7 +557,7 @@
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if (slist == NULL || n == NULL) \
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return NULL; \
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\
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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\
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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@ -531,7 +587,7 @@
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if (slist == NULL || n == NULL) \
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return NULL; \
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\
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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\
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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@ -565,7 +621,7 @@
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if (slist == NULL || n == NULL) \
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return NULL; \
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\
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i = slist->slh_head->field.sle.len; \
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i = slist->slh_head->field.sle.height; \
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\
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do { \
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while (elm && __skip_key_compare_##decl(slist, elm->field.sle.next[i], n, slist->aux) < 0) \
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@ -631,7 +687,7 @@
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return -1; \
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} \
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\
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/* -- skip_remove_ BUG: prev pointer wrong!*/ \
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/* -- skip_remove_ */ \
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int prefix##skip_remove_##decl(decl##_t *slist, decl##_node_t *n) \
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{ \
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static decl##_node_t apath[SKIPLIST_MAX_HEIGHT + 1]; \
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@ -659,8 +715,8 @@
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break; \
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path[i]->field.sle.next[i - 1] = node->field.sle.next[i - 1]; \
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if (path[i]->field.sle.next[i - 1] == slist->slh_tail) { \
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level = path[i]->field.sle.len; \
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path[i]->field.sle.len = level - 1; \
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level = path[i]->field.sle.height; \
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path[i]->field.sle.height = level - 1; \
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} \
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} \
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if (node->field.sle.next[0] == slist->slh_tail) { \
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@ -674,10 +730,10 @@
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at the tail and shrink the level. */ \
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i = 0; \
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node = slist->slh_head; \
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while (node->field.sle.next[i] != slist->slh_tail && i++ < slist->slh_head->field.sle.len) \
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while (node->field.sle.next[i] != slist->slh_tail && i++ < slist->slh_head->field.sle.height) \
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; \
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slist->slh_head->field.sle.len = i; \
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slist->slh_tail->field.sle.len = i; \
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slist->slh_head->field.sle.height = i; \
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slist->slh_tail->field.sle.height = i; \
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slist->length--; \
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} \
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return 0; \
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@ -725,7 +781,7 @@
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} \
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\
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/* -- skip_snapshot_ TODO/WIP \
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* A snapshot is a read-only view of a Skiplist at a point in \
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* A snapshot is a read-only view of a Skip List at a point in \
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* time. Once taken, a snapshot must be restored or disposed. \
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* Any number of snapshots can be created. \
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* \
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@ -786,12 +842,12 @@
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if (rc) \
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goto fail; \
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\
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slist->slh_head->field.sle.len = 0; \
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slist->slh_head->field.sle.height = 0; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_head->field.sle.next[i] = slist->slh_tail; \
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slist->slh_head->field.sle.prev = NULL; \
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\
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slist->slh_tail->field.sle.len = slist->max; \
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slist->slh_tail->field.sle.height = slist->max; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_tail->field.sle.next[i] = NULL; \
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slist->slh_tail->field.sle.prev = slist->slh_head; \
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@ -893,12 +949,12 @@
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if (rc) \
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goto fail; \
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\
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slist->slh_head->field.sle.len = 0; \
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slist->slh_head->field.sle.height = 0; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_head->field.sle.next[i] = slist->slh_tail; \
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slist->slh_head->field.sle.prev = NULL; \
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\
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slist->slh_tail->field.sle.len = slist->max; \
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slist->slh_tail->field.sle.height = slist->max; \
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for (i = 0; i < slist->max; i++) \
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slist->slh_tail->field.sle.next[i] = NULL; \
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slist->slh_tail->field.sle.prev = slist->slh_head; \
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@ -941,6 +997,17 @@
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return (vtype)0; \
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} \
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\
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int prefix##skip_contains_##decl(decl##_t *slist, ktype key) \
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{ \
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decl##_node_t *node, query; \
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\
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qblk; \
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node = prefix##skip_position_eq_##decl(slist, &query); \
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if (node) \
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return 1; \
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return 0; \
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} \
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\
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decl##_node_t *prefix##skip_pos_##decl(decl##_t *slist, skip_pos_##decl_t op, ktype key) \
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{ \
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decl##_node_t *node, query; \
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@ -997,189 +1064,189 @@
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return prefix##skip_remove_##decl(slist, &node); \
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}
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#define SKIPLIST_DECL_DOT(decl, prefix, field) \
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\
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/* A type for a function that writes into a char[2048] buffer \
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* a description of the value within the node. */ \
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typedef void (*skip_sprintf_node_##decl##_t)(decl##_node_t *, char *); \
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\
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/* -- __skip_dot_node_ \
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* Writes out a fragment of a DOT file representing a node. \
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*/ \
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static size_t __skip_dot_width_##decl(decl##_t *slist, decl##_node_t *node, size_t level) \
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{ \
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size_t w = 0; \
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decl##_node_t *n; \
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||||
\
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||||
if (node == slist->slh_tail) \
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return 0; \
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n = node->field.sle.next[level]; \
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\
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do { \
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w++; \
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n = prefix##skip_prev_node_##decl(slist, n); \
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} while (n && n->field.sle.prev != node); \
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||||
\
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return --w; \
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} \
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\
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/* -- __skip_dot_node_ \
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* Writes out a fragment of a DOT file representing a node. \
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*/ \
|
||||
static void __skip_dot_node_##decl(FILE *os, decl##_t *slist, decl##_node_t *node, size_t nsg, skip_sprintf_node_##decl##_t fn) \
|
||||
{ \
|
||||
char buf[2048]; \
|
||||
size_t level, width, height = node->field.sle.len; \
|
||||
decl##_node_t *next; \
|
||||
\
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node); \
|
||||
fprintf(os, " [label = \""); \
|
||||
level = height; \
|
||||
while (level--) { \
|
||||
width = __skip_dot_width_##decl(slist, node, level); \
|
||||
fprintf(os, " { <w%zu> %zu | <f%zu> %p } |", level, width, level, (void *)node->field.sle.next[level]); \
|
||||
} \
|
||||
if (fn) { \
|
||||
fn(node, buf); \
|
||||
fprintf(os, " <f0> %s\"\n", buf); \
|
||||
} else { \
|
||||
fprintf(os, " <f0> ?\"\n"); \
|
||||
} \
|
||||
fprintf(os, "shape = \"record\"\n"); \
|
||||
fprintf(os, "];\n"); \
|
||||
\
|
||||
/* Now edges */ \
|
||||
level = 0; \
|
||||
for (level = 0; level < height; level++) { \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node); \
|
||||
fprintf(os, ":f%zu -> ", level); \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node->field.sle.next[level]); \
|
||||
fprintf(os, ":w%zu [];\n", level); \
|
||||
} \
|
||||
next = prefix##skip_next_node_##decl(slist, node); \
|
||||
if (next) \
|
||||
__skip_dot_node_##decl(os, slist, next, nsg, fn); \
|
||||
} \
|
||||
\
|
||||
/* -- _skip_dot_finish_ \
|
||||
* Finalize the DOT file of the internal representation. \
|
||||
*/ \
|
||||
void prefix##skip_dot_end_##decl(FILE *os, size_t nsg) \
|
||||
{ \
|
||||
size_t i; \
|
||||
if (nsg > 0) { \
|
||||
/* Link the nodes together with an invisible node. \
|
||||
* node0 [shape=record, label = "<f0> | <f1> | <f2> | <f3> | \
|
||||
* <f4> | <f5> | <f6> | <f7> | <f8> | ", style=invis, width=0.01]; \
|
||||
*/ \
|
||||
fprintf(os, "node0 [shape=record, label = \""); \
|
||||
for (i = 0; i < nsg; ++i) { \
|
||||
fprintf(os, "<f%zu> | ", i); \
|
||||
} \
|
||||
fprintf(os, "\", style=invis, width=0.01];\n"); \
|
||||
\
|
||||
/* Now connect nodes with invisible edges \
|
||||
* \
|
||||
* node0:f0 -> HeadNode [style=invis]; \
|
||||
* node0:f1 -> HeadNode1 [style=invis]; \
|
||||
*/ \
|
||||
for (i = 0; i < nsg; ++i) { \
|
||||
fprintf(os, "node0:f%zu -> HeadNode%zu [style=invis];\n", i, i); \
|
||||
} \
|
||||
nsg = 0; \
|
||||
} \
|
||||
fprintf(os, "}\n"); \
|
||||
} \
|
||||
\
|
||||
/* -- skip_dot_ \
|
||||
* Create a DOT file of the internal representation of the \
|
||||
* Skiplist on the provided file descriptor (default: STDOUT). \
|
||||
* \
|
||||
* To view the output: \
|
||||
* $ dot -Tps filename.dot -o outfile.ps \
|
||||
* You can change the output format by varying the value after -T and \
|
||||
* choosing an appropriate filename extension after -o. \
|
||||
* See: https://graphviz.org/docs/outputs/ for the format options. \
|
||||
* \
|
||||
* https://en.wikipedia.org/wiki/DOT_(graph_description_language) \
|
||||
*/ \
|
||||
int prefix##skip_dot_##decl(FILE *os, decl##_t *slist, size_t nsg, skip_sprintf_node_##decl##_t fn) \
|
||||
{ \
|
||||
size_t width, level; \
|
||||
decl##_node_t *node, *next; \
|
||||
\
|
||||
if (slist == NULL || fn == NULL) \
|
||||
return nsg; \
|
||||
if (__skip_integrity_check_##decl(slist) != 0) { \
|
||||
perror("Skiplist failed integrity checks, impossible to diagram."); \
|
||||
return -1; \
|
||||
} \
|
||||
if (nsg == 0) { \
|
||||
fprintf(os, "digraph Skiplist {\n"); \
|
||||
fprintf(os, "label = \"Skiplist.\"\n"); \
|
||||
fprintf(os, "graph [rankdir = \"LR\"];\n"); \
|
||||
fprintf(os, "node [fontsize = \"12\" shape = \"ellipse\"];\n"); \
|
||||
fprintf(os, "edge [];\n\n"); \
|
||||
} \
|
||||
fprintf(os, "subgraph cluster%zu {\n", nsg); \
|
||||
fprintf(os, "style=dashed\n"); \
|
||||
fprintf(os, "label=\"Skip list iteration %zu\"\n\n", nsg); \
|
||||
fprintf(os, "\"HeadNode%zu\" [\n", nsg); \
|
||||
fprintf(os, "label = \""); \
|
||||
\
|
||||
/* Write out the fields */ \
|
||||
if (prefix##skip_size_##decl(slist) == 0) \
|
||||
fprintf(os, "Empty HeadNode"); \
|
||||
else { \
|
||||
node = slist->slh_head->field.sle.next[0]; \
|
||||
level = slist->slh_head->field.sle.len; \
|
||||
next = node->field.sle.next[level] == NULL ? slist->slh_tail : node->field.sle.next[level]; \
|
||||
do { \
|
||||
width = __skip_dot_width_##decl(slist, node, level); \
|
||||
fprintf(os, "{ %zu | <f%zu> %p }", width, level, (void *)next); \
|
||||
if (level) \
|
||||
fprintf(os, " | "); \
|
||||
} while (level--); \
|
||||
} \
|
||||
fprintf(os, "\"\n"); \
|
||||
fprintf(os, "shape = \"record\"\n"); \
|
||||
fprintf(os, "];\n"); \
|
||||
\
|
||||
/* Edges for head node */ \
|
||||
node = slist->slh_head; \
|
||||
for (level = 0; level < slist->slh_head->field.sle.len; level++) { \
|
||||
if (node->field.sle.next[level] == slist->slh_tail) \
|
||||
break; \
|
||||
fprintf(os, "\"HeadNode%zu\":f%zu -> ", nsg, level); \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node->field.sle.next[level]); \
|
||||
fprintf(os, ":w%zu [];\n", level); \
|
||||
} \
|
||||
fprintf(os, "\n"); \
|
||||
\
|
||||
/* Now all nodes via level 0, if non-empty */ \
|
||||
node = prefix##skip_head_##decl(slist); \
|
||||
if (node) \
|
||||
__skip_dot_node_##decl(os, slist, node, nsg, fn); \
|
||||
fprintf(os, "\n"); \
|
||||
\
|
||||
/* The tail, sentinal node */ \
|
||||
node = slist->slh_tail; \
|
||||
if (prefix##skip_size_##decl(slist) > 0) { \
|
||||
fprintf(os, "\"node%zu %p\" [label = \"", nsg, (void *)slist->slh_tail); \
|
||||
level = node->field.sle.len; \
|
||||
do { \
|
||||
fprintf(os, "<w%zu> %p", level, (void *)node); \
|
||||
if (level && node->field.sle.prev != slist->slh_head) \
|
||||
fprintf(os, " | "); \
|
||||
} while (level--); \
|
||||
fprintf(os, "\" shape = \"record\"];\n"); \
|
||||
} \
|
||||
\
|
||||
/* End: "subgraph cluster0 {" */ \
|
||||
fprintf(os, "}\n\n"); \
|
||||
nsg += 1; \
|
||||
\
|
||||
return nsg; \
|
||||
#define SKIPLIST_DECL_DOT(decl, prefix, field) \
|
||||
\
|
||||
/* A type for a function that writes into a char[2048] buffer \
|
||||
* a description of the value within the node. */ \
|
||||
typedef void (*skip_sprintf_node_##decl##_t)(decl##_node_t *, char *); \
|
||||
\
|
||||
/* -- __skip_dot_node_ \
|
||||
* Writes out a fragment of a DOT file representing a node. \
|
||||
*/ \
|
||||
static size_t __skip_dot_width_##decl(decl##_t *slist, decl##_node_t *node, size_t level) \
|
||||
{ \
|
||||
size_t w = 0; \
|
||||
decl##_node_t *n; \
|
||||
\
|
||||
if (node == slist->slh_tail) \
|
||||
return 0; \
|
||||
n = node->field.sle.next[level]; \
|
||||
\
|
||||
do { \
|
||||
w++; \
|
||||
n = prefix##skip_prev_node_##decl(slist, n); \
|
||||
} while (n && n->field.sle.prev != node); \
|
||||
\
|
||||
return --w; \
|
||||
} \
|
||||
\
|
||||
/* -- __skip_dot_node_ \
|
||||
* Writes out a fragment of a DOT file representing a node. \
|
||||
*/ \
|
||||
static void __skip_dot_node_##decl(FILE *os, decl##_t *slist, decl##_node_t *node, size_t nsg, skip_sprintf_node_##decl##_t fn) \
|
||||
{ \
|
||||
char buf[2048]; \
|
||||
size_t level, width, height = node->field.sle.height; \
|
||||
decl##_node_t *next; \
|
||||
\
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node); \
|
||||
fprintf(os, " [label = \""); \
|
||||
level = height; \
|
||||
while (level--) { \
|
||||
width = __skip_dot_width_##decl(slist, node, level); \
|
||||
fprintf(os, " { <w%zu> %zu | <f%zu> %p } |", level, width, level, (void *)node->field.sle.next[level]); \
|
||||
} \
|
||||
if (fn) { \
|
||||
fn(node, buf); \
|
||||
fprintf(os, " <f0> %s\"\n", buf); \
|
||||
} else { \
|
||||
fprintf(os, " <f0> ?\"\n"); \
|
||||
} \
|
||||
fprintf(os, "shape = \"record\"\n"); \
|
||||
fprintf(os, "];\n"); \
|
||||
\
|
||||
/* Now edges */ \
|
||||
level = 0; \
|
||||
for (level = 0; level < height; level++) { \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node); \
|
||||
fprintf(os, ":f%zu -> ", level); \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node->field.sle.next[level]); \
|
||||
fprintf(os, ":w%zu [];\n", level); \
|
||||
} \
|
||||
next = prefix##skip_next_node_##decl(slist, node); \
|
||||
if (next) \
|
||||
__skip_dot_node_##decl(os, slist, next, nsg, fn); \
|
||||
} \
|
||||
\
|
||||
/* -- _skip_dot_finish_ \
|
||||
* Finalize the DOT file of the internal representation. \
|
||||
*/ \
|
||||
void prefix##skip_dot_end_##decl(FILE *os, size_t nsg) \
|
||||
{ \
|
||||
size_t i; \
|
||||
if (nsg > 0) { \
|
||||
/* Link the nodes together with an invisible node. \
|
||||
* node0 [shape=record, label = "<f0> | <f1> | <f2> | <f3> | \
|
||||
* <f4> | <f5> | <f6> | <f7> | <f8> | ", style=invis, width=0.01]; \
|
||||
*/ \
|
||||
fprintf(os, "node0 [shape=record, label = \""); \
|
||||
for (i = 0; i < nsg; ++i) { \
|
||||
fprintf(os, "<f%zu> | ", i); \
|
||||
} \
|
||||
fprintf(os, "\", style=invis, width=0.01];\n"); \
|
||||
\
|
||||
/* Now connect nodes with invisible edges \
|
||||
* \
|
||||
* node0:f0 -> HeadNode [style=invis]; \
|
||||
* node0:f1 -> HeadNode1 [style=invis]; \
|
||||
*/ \
|
||||
for (i = 0; i < nsg; ++i) { \
|
||||
fprintf(os, "node0:f%zu -> HeadNode%zu [style=invis];\n", i, i); \
|
||||
} \
|
||||
nsg = 0; \
|
||||
} \
|
||||
fprintf(os, "}\n"); \
|
||||
} \
|
||||
\
|
||||
/* -- skip_dot_ \
|
||||
* Create a DOT file of the internal representation of the \
|
||||
* Skip List on the provided file descriptor (default: STDOUT). \
|
||||
* \
|
||||
* To view the output: \
|
||||
* $ dot -Tps filename.dot -o outfile.ps \
|
||||
* You can change the output format by varying the value after -T and \
|
||||
* choosing an appropriate filename extension after -o. \
|
||||
* See: https://graphviz.org/docs/outputs/ for the format options. \
|
||||
* \
|
||||
* https://en.wikipedia.org/wiki/DOT_(graph_description_language) \
|
||||
*/ \
|
||||
int prefix##skip_dot_##decl(FILE *os, decl##_t *slist, size_t nsg, skip_sprintf_node_##decl##_t fn) \
|
||||
{ \
|
||||
size_t width, level; \
|
||||
decl##_node_t *node, *next; \
|
||||
\
|
||||
if (slist == NULL || fn == NULL) \
|
||||
return nsg; \
|
||||
if (__skip_integrity_check_##decl(slist) != 0) { \
|
||||
perror("Skiplist failed integrity checks, impossible to diagram."); \
|
||||
return -1; \
|
||||
} \
|
||||
if (nsg == 0) { \
|
||||
fprintf(os, "digraph Skiplist {\n"); \
|
||||
fprintf(os, "label = \"Skiplist.\"\n"); \
|
||||
fprintf(os, "graph [rankdir = \"LR\"];\n"); \
|
||||
fprintf(os, "node [fontsize = \"12\" shape = \"ellipse\"];\n"); \
|
||||
fprintf(os, "edge [];\n\n"); \
|
||||
} \
|
||||
fprintf(os, "subgraph cluster%zu {\n", nsg); \
|
||||
fprintf(os, "style=dashed\n"); \
|
||||
fprintf(os, "label=\"Skip list iteration %zu\"\n\n", nsg); \
|
||||
fprintf(os, "\"HeadNode%zu\" [\n", nsg); \
|
||||
fprintf(os, "label = \""); \
|
||||
\
|
||||
/* Write out the fields */ \
|
||||
if (prefix##skip_size_##decl(slist) == 0) \
|
||||
fprintf(os, "Empty HeadNode"); \
|
||||
else { \
|
||||
node = slist->slh_head->field.sle.next[0]; \
|
||||
level = slist->slh_head->field.sle.height; \
|
||||
next = node->field.sle.next[level] == NULL ? slist->slh_tail : node->field.sle.next[level]; /*TODO*/ \
|
||||
do { \
|
||||
width = __skip_dot_width_##decl(slist, node, level); \
|
||||
fprintf(os, "{ %zu | <f%zu> %p }", width, level, (void *)next); \
|
||||
if (level) \
|
||||
fprintf(os, " | "); \
|
||||
} while (level--); \
|
||||
} \
|
||||
fprintf(os, "\"\n"); \
|
||||
fprintf(os, "shape = \"record\"\n"); \
|
||||
fprintf(os, "];\n"); \
|
||||
\
|
||||
/* Edges for head node */ \
|
||||
node = slist->slh_head; \
|
||||
for (level = 0; level < slist->slh_head->field.sle.height; level++) { \
|
||||
if (node->field.sle.next[level] == slist->slh_tail) \
|
||||
break; \
|
||||
fprintf(os, "\"HeadNode%zu\":f%zu -> ", nsg, level); \
|
||||
fprintf(os, "\"node%zu %p\"", nsg, (void *)node->field.sle.next[level]); \
|
||||
fprintf(os, ":w%zu [];\n", level); \
|
||||
} \
|
||||
fprintf(os, "\n"); \
|
||||
\
|
||||
/* Now all nodes via level 0, if non-empty */ \
|
||||
node = prefix##skip_head_##decl(slist); \
|
||||
if (node) \
|
||||
__skip_dot_node_##decl(os, slist, node, nsg, fn); \
|
||||
fprintf(os, "\n"); \
|
||||
\
|
||||
/* The tail, sentinal node */ \
|
||||
node = slist->slh_tail; \
|
||||
if (prefix##skip_size_##decl(slist) > 0) { \
|
||||
fprintf(os, "\"node%zu %p\" [label = \"", nsg, (void *)slist->slh_tail); \
|
||||
level = node->field.sle.height; \
|
||||
do { \
|
||||
fprintf(os, "<w%zu> %p", level, (void *)node); \
|
||||
if (level && node->field.sle.prev != slist->slh_head) \
|
||||
fprintf(os, " | "); \
|
||||
} while (level--); \
|
||||
fprintf(os, "\" shape = \"record\"];\n"); \
|
||||
} \
|
||||
\
|
||||
/* End: "subgraph cluster0 {" */ \
|
||||
fprintf(os, "}\n\n"); \
|
||||
nsg += 1; \
|
||||
\
|
||||
return nsg; \
|
||||
}
|
||||
|
||||
#endif /* _SKIPLIST_H_ */
|
||||
|
|
|
|||
Loading…
Reference in a new issue