adding dot and integrity
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7a15b70530
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f6de9cb321
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@ -1,7 +1,9 @@
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <errno.h>
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#include <string.h>
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#include "../include/sl.h"
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/*
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@ -11,16 +13,43 @@
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* 'slex' - meaning: SkipList EXample
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*/
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/* Create a type of Skiplist that maps int -> int. */
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/*
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* To start, you must create a type node that will contain the
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* fields you'd like to maintain in your Skiplist. In this case
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* we map int -> int, but what you put here is up to you. You
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* don't even need a "key", just a way to compare one node against
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* another, logic you'll provide in SKIP_DECL as a block below.
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*/
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struct slex_node {
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int key;
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int value;
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SKIP_ENTRY(slex_node) entries;
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};
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SKIP_HEAD(slex, slex_node);
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/* Generate all the access functions for our type of Skiplist. */
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SKIP_DECL(slex, api_, entries, {
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/*
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* Generate all the access functions for our type of Skiplist.
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* The last argument to this macro is a block of code used to
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* compare the nodes you defined above.
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* This block can expect four arguments:
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* - a reference to the Skiplist, `slist`
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* - the two nodes to compare, `a` and `b`
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* - and `aux`, which you can use to pass into this function
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* any additional information required to compare objects.
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* `aux` is passed from the value in the Skiplist, you can
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* modify that value at any time to suit your needs.
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*
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* Your block should result in a return statement:
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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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* This result provides the ordering within the Skiplist. Sometimes
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* your block of code will not be used when comparing nodes. This
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* happens when `a` or `b` are references to the head or tail of the
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* list or when `a == b`. In those cases the comparison function
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* returns before using the code in your block, don't panic. :)
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*/
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SKIPLIST_DECL(slex, api_, entries, {
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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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195
include/sl.h
195
include/sl.h
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@ -122,15 +122,10 @@ struct sl_trace {
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} \
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} while(0)
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#define ARRAY_FREE(var) free((var)-2)
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#define ARRAY_SIZE(list) (list)[-2]
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#define ARRAY_SIZE(list) (unsigned int)(uintptr_t)((list)-2)
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#define ARRAY_SET_SIZE(list, size) (list)[-2] = (void *)(uintptr_t)(size)
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#define ARRAY_LENGTH(list) (list)[-1]
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#define ARRAY_LENGTH(list) (unsigned int)(uintptr_t)((list)-1)
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#define ARRAY_SET_LENGTH(list, len) (list)[-1] = (void *)(uintptr_t)(len)
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#define ARRAY_FOREACH(var, list) \
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for(unsigned int (var) = 0; (var) < (unsigned int)(uintptr_t)ARRAY_LENGTH(list); (var)++)
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#define ARRAY_FORALL(var, list) \
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for(unsigned int (var) = 0; (var) < (unsigned int)(uintptr_t)ARRAY_SIZE(list); (var)++)
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/*
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* Skiplist declarations.
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@ -213,12 +208,12 @@ struct sl_trace {
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SKIP_ALLOC_NODE(head, (head)->slh_head, type, field); \
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SKIP_ALLOC_NODE(head, (head)->slh_tail, type, field); \
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ARRAY_SET_LENGTH((head)->slh_head->field.sle_next, max); \
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ARRAY_FORALL(__i, (head)->slh_head->field.sle_next) { \
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for(size_t __i = 0; __i < ARRAY_SIZE((head)->slh_head->field.sle_next); __i++) { \
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(head)->slh_head->field.sle_next[__i] = (head)->slh_tail; \
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} \
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(head)->slh_head->field.sle_prev = NULL; \
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ARRAY_SET_LENGTH((head)->slh_tail->field.sle_next, max); \
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ARRAY_FORALL(__i, (head)->slh_tail->field.sle_next) { \
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for(size_t __i = 0; __i < ARRAY_SIZE((head)->slh_tail->field.sle_next); __i++) { \
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(head)->slh_tail->field.sle_next[__i] = NULL; \
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} \
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(head)->slh_head->field.sle_prev = (head)->slh_tail; \
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@ -234,12 +229,12 @@ struct sl_trace {
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SKIP_ALLOC_NODE(head, (head)->slh_head, type, field); \
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SKIP_ALLOC_NODE(head, (head)->slh_tail, type, field); \
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ARRAY_SET_LENGTH((head)->slh_head->field.sle_next, (head)->max); \
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ARRAY_FORALL(__i, (head)->slh_head->field.sle_next) { \
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for(size_t __i = 0; __i < ARRAY_SIZE((head)->slh_head->field.sle_next); __i++) { \
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(head)->slh_head->field.sle_next[__i] = (head)->slh_tail; \
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} \
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(head)->slh_head->field.sle_prev = NULL; \
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ARRAY_SET_LENGTH((head)->slh_tail->field.sle_next, (head)->max); \
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ARRAY_FORALL(__i, (head)->slh_tail->field.sle_next) { \
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ARRAY_SET_LENGTH((head)->slh_tail->field.sle_next, (head)->max); \
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for(size_t __i = 0; __i < ARRAY_SIZE((head)->slh_tail->field.sle_next); __i++) { \
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(head)->slh_tail->field.sle_next[__i] = NULL; \
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} \
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(head)->slh_head->field.sle_prev = (head)->slh_tail; \
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@ -261,14 +256,22 @@ struct sl_trace {
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free((node)); \
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} while (0)
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#define SKIP_DECL(decl, prefix, field, key_cmp_logic) \
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/* Skiplist type */ \
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typedef struct decl decl##_t; \
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#define SKIPLIST_DECL(decl, prefix, field, key_cmp_logic) \
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\
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/* Skiplist node type */ \
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typedef struct decl##_node decl##_node_t; \
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\
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/* -- __skip_key_compare_decl \
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/* Skiplist type */ \
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typedef struct decl { \
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size_t level, length, max, fanout; \
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int (*cmp)(struct decl *, decl##_node_t *, decl##_node_t *, void *); \
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void *aux; \
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decl##_node_t *slh_head; \
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decl##_node_t *slh_tail; \
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TRACEBUF \
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}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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@ -289,7 +292,7 @@ struct sl_trace {
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do { key_cmp_logic } while(0); \
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} \
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\
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/* -- __skip_toss_decl */ \
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/* -- __skip_toss_ */ \
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static int __skip_toss_##decl(size_t max, size_t fanout) { \
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size_t level = 0; \
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while (level + 1 < max) { \
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@ -301,7 +304,7 @@ struct sl_trace {
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return level; \
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} \
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\
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/* -- prefixskip_insert_decl */ \
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/* -- skip_insert_ */ \
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int prefix##skip_insert_##decl(decl##_t *slist, decl##_node_t *n) { \
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if (n == NULL) \
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return ENOMEM; \
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@ -346,6 +349,162 @@ struct sl_trace {
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slist->length++; \
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ARRAY_FREE(path); \
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return 0; \
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} \
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\
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/* -- __skip_integrity_check_ */ \
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static int __skip_integrity_check_##decl() { \
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return 0; \
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} \
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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 void __skip_dot_node_##decl(FILE *os, decl##_t *slist, decl##_node_t *node, size_t suffix, skip_sprintf_node_##decl##_t fn) { \
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fprintf(os, "\"node%zu%p\"", suffix, (void*)node); \
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fprintf(os, " [label = \""); \
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size_t level = ARRAY_LENGTH(node->field.sle_next); \
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do { \
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fprintf(os, " { <w%zu> | <f%zu> %p }", level, level, (void*)node->field.sle_next[level]); \
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if (level != 0) fprintf(os, " | "); \
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} while (level--); \
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if (fn) { \
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char buf[2048]; \
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fn(node, buf); \
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fprintf(os, " <f0> %s\"\n", buf); \
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} else { \
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fprintf(os, " <f0> ?\"\n"); \
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} \
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fprintf(os, "shape = \"record\"\n"); \
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fprintf(os, "];\n"); \
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\
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/* Now edges */ \
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level = 0; \
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size_t size = ARRAY_LENGTH(node->field.sle_next); \
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for (size_t level = 0; level <= size; level++) { \
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fprintf(os, "\"node%zu%p\"", suffix, (void*)node); \
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fprintf(os, ":f%zu -> SomeNode [style=solid];\n", level); \
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} \
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\
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if (node->field.sle_next[0]) \
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__skip_dot_node_##decl(os, slist, node->field.sle_next[0], suffix, fn); \
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} \
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\
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/* -- __skip_dot_finish_ \
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* Finalise the DOT file of the internal representation. \
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*/ \
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static void __skip_dot_finish_##decl(FILE *os, size_t nsg) { \
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if (nsg > 0) { \
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/* Link the nodes together with an invisible node. */ \
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fprintf(os, "node0 [shape=record, label = \""); \
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for (size_t i = 0; i < nsg; ++i) { \
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fprintf(os, "<f%zu> | ", i); \
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} \
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fprintf(os, "\", style=invis, width=0.01];\n"); \
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\
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/* Now connect nodes with invisible edges */ \
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for (size_t i = 0; i < nsg; ++i) { \
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fprintf(os, "node0:f%zu -> HeadNode%zu [style=invis];\n", i, i);\
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} \
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nsg = 0; \
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} \
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fprintf(os, "}\n"); \
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} \
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\
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/* -- skip_dot_start_ */ \
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static int __skip_dot_start_##decl(FILE *os, decl##_t *slist, size_t nsg) { \
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if (nsg == 0) { \
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fprintf(os, "digraph Skiplist {\n"); \
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fprintf(os, "label = \"Skiplist.\"\n"); \
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fprintf(os, "graph [rankdir = \"LR\"];\n"); \
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fprintf(os, "node [fontsize = \"12\" shape = \"ellipse\"];\n"); \
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fprintf(os, "edge [];\n\n"); \
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} \
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fprintf(os, "subgraph cluster%zu {\n", nsg); \
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fprintf(os, "style=dashed\n"); \
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fprintf(os, "label=\"Skip list iteration %zu\"\n\n", nsg); \
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fprintf(os, "\"HeadNode%zu\" [\n", nsg); \
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fprintf(os, "label = \""); \
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\
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/* Write out the head node fields */ \
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decl##_node_t *head = slist->slh_head; \
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size_t level; \
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if (SKIP_EMPTY(slist)) fprintf(os, "Empty HeadNode"); else { \
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level = ARRAY_LENGTH(head->field.sle_next); \
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do { \
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decl##_node_t *node = head->field.sle_next[level]; \
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fprintf(os, "{ <f%zu> %p }", level + 1, (void *)node); \
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if (level != 0) fprintf(os, " | "); \
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} while(level--); \
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} \
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fprintf(os, "\"\n"); \
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fprintf(os, "shape = \"record\"\n"); \
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fprintf(os, "];\n"); \
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\
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/* Edges for head node */ \
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level = 0; \
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do { \
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fprintf(os, "\"HeadNode%zu\":f%zu -> ", nsg, level); \
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/* Write logic to handle edge connections */ \
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fprintf(os, "SomeNode [style=solid];\n"); \
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} while(level++ < ARRAY_LENGTH(slist)); \
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fprintf(os, "}\n\n"); \
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\
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/* Now all nodes via level 0, if non-empty */ \
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decl##_node_t *node = slist->slh_head; \
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if (ARRAY_LENGTH(node->field.sle_next)) \
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__skip_dot_node_##decl(os, slist, node, nsg, NULL); \
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fprintf(os, "\n"); \
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\
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/* The tail, sentinal node */ \
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if (!SKIP_EMPTY(slist)) { \
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fprintf(os,"\"node%zu0x0\" [label = \"", nsg); \
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size_t level = slist->level; \
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do { \
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fprintf(os, "<w%zu> NULL", level); \
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if (level != 0) \
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fprintf(os, " | "); \
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} while(level-- > 0); \
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fprintf(os, "\" shape = \"record\"];\n"); \
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} \
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\
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/* End: "subgraph cluster1 {" */ \
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fprintf(os, "}\n\n"); \
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nsg += 1; \
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\
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return 0; \
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} \
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\
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/* -- skip_dot_ \
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* Create a DOT file of the internal representation of the \
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* Skiplist on the provided file descriptor (default: STDOUT). \
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* \
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* To view the output: \
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* $ dot -Tps filename.dot -o outfile.ps \
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* You can change the output format by varying the value after -T and \
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* choosing an appropriate filename extension after -o. \
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* See: https://graphviz.org/docs/outputs/ for the format options. \
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* \
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* https://en.wikipedia.org/wiki/DOT_(graph_description_language) \
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*/ \
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int prefix##skip_dot_##decl(FILE *os, decl##_t *slist) { \
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size_t nsg = 0; \
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if (__skip_integrity_check_##decl(slist) != 0) { \
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perror("Skiplist failed integrity checks, impossible to diagram.");\
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return -1; \
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} \
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if (os == NULL) \
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os = stdout; \
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if (!os) { \
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perror("Failed to open output file, unable to write DOT file.");\
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return -1; \
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} \
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__skip_dot_start_##decl(os, slist, nsg); \
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__skip_dot_finish_##decl(os, nsg); \
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return 0; \
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} \
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/* END */
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