-
-
-
-/* $Id$ */
-
-
/* a generic graph library. */
-/* Copyright (c) 2006 Darina Dimitrova, Arnaud Legrand.
- All rights reserved. */
+/* Copyright (c) 2006-2014. The SimGrid Team.
+ * All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
-#include <stdlib.h>
#include "xbt/sysdep.h"
#include "xbt/log.h"
#include "xbt/graph.h"
#include "graph_private.h"
-#include "xbt/graphxml_parse.h"
#include "xbt/dict.h"
+#include "xbt/heap.h"
+#include "xbt/str.h"
+#include "xbt/file.h"
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(graph, xbt, "Graph");
-
+#include <errno.h>
+#include <stdlib.h>
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_graph, xbt, "Graph");
-/** Constructor
- * \return a new graph
+/** @brief Constructor
+ * @return a new graph
*/
xbt_graph_t xbt_graph_new_graph(unsigned short int directed, void *data)
{
return graph;
}
+/** @brief add a node to the given graph */
xbt_node_t xbt_graph_new_node(xbt_graph_t g, void *data)
{
xbt_node_t node = NULL;
node = xbt_new0(struct xbt_node, 1);
node->data = data;
- node->in = xbt_dynar_new(sizeof(xbt_node_t), NULL);
- node->out = xbt_dynar_new(sizeof(xbt_node_t), NULL);
+ if (g->directed)
+ /* only the "out" field is used */
+ node->in = xbt_dynar_new(sizeof(xbt_edge_t), NULL);
+
+ node->out = xbt_dynar_new(sizeof(xbt_edge_t), NULL);
+ node->position_x = -1.0;
+ node->position_y = -1.0;
+
xbt_dynar_push(g->nodes, &node);
return node;
}
-
-xbt_edge_t xbt_graph_new_edge(xbt_graph_t g,
- xbt_node_t src, xbt_node_t dst, void *data)
+/** @brief add an edge to the given graph */
+xbt_edge_t xbt_graph_new_edge(xbt_graph_t g, xbt_node_t src, xbt_node_t dst, void *data)
{
xbt_edge_t edge = NULL;
-
edge = xbt_new0(struct xbt_edge, 1);
xbt_dynar_push(src->out, &edge);
- xbt_dynar_push(dst->in, &edge);
+ if (g->directed)
+ xbt_dynar_push(dst->in, &edge);
+ else /* only the "out" field is used */
+ xbt_dynar_push(dst->out, &edge);
edge->data = data;
edge->src = src;
edge->dst = dst;
- if (!g->directed)
- {
- xbt_dynar_push(src->in, &edge);
- xbt_dynar_push(dst->out, &edge);
- }
xbt_dynar_push(g->edges, &edge);
return edge;
}
-
-/** Destructor
- * \param l poor victim
- *
- * Free the graph structure.
- */
-void xbt_graph_free_graph(xbt_graph_t g,
- void node_free_function(void *ptr),
- void edge_free_function(void *ptr),
- void graph_free_function(void *ptr))
+/** @brief Get the edge connecting src and dst */
+xbt_edge_t xbt_graph_get_edge(xbt_graph_t g, xbt_node_t src, xbt_node_t dst)
{
- int cursor = 0;
- xbt_node_t node = NULL;
- xbt_edge_t edge = NULL;
-
+ xbt_edge_t edge;
+ unsigned int cursor;
- xbt_dynar_foreach(g->nodes, cursor, node)
- {
- xbt_dynar_free(&(node->out));
- xbt_dynar_free(&(node->in));
- if(node_free_function)
- node_free_function(node->data);
- }
-
- xbt_dynar_foreach(g->edges, cursor, edge)
- {
- if(edge_free_function)
- edge_free_function(edge->data);
+ xbt_dynar_foreach(src->out, cursor, edge) {
+ XBT_DEBUG("%p = %p--%p", edge, edge->src, edge->dst);
+ if ((edge->src == src) && (edge->dst == dst))
+ return edge;
+ }
+ if (!g->directed) {
+ xbt_dynar_foreach(src->out, cursor, edge) {
+ XBT_DEBUG("%p = %p--%p", edge, edge->src, edge->dst);
+ if ((edge->dst == src) && (edge->src == dst))
+ return edge;
}
-
- xbt_dynar_foreach(g->nodes, cursor, node)
- free(node);
- xbt_dynar_free(&(g->nodes));
-
- xbt_dynar_foreach(g->edges, cursor, edge)
- free(edge);
- xbt_dynar_free(&(g->edges));
-
- free(g);
-
- return;
+ }
+ return NULL;
}
-
-
-void xbt_graph_free_node(xbt_graph_t g, xbt_node_t n,
- void_f_pvoid_t * node_free_function,
- void_f_pvoid_t * edge_free_function)
+/** @brief Get the user data associated to a node */
+void *xbt_graph_node_get_data(xbt_node_t node)
{
- unsigned long nbr;
- int i;
- int cursor = 0;
- xbt_node_t node = NULL;
- xbt_edge_t edge = NULL;
-
- nbr = xbt_dynar_length(g->edges);
- cursor=0;
- for (i = 0; i < nbr; i++)
- {
- xbt_dynar_cursor_get(g->edges, &cursor, &edge);
-
- if ((edge->dst == n) || (edge->src == n))
- {
- xbt_graph_free_edge(g, edge, edge_free_function);
- }
- else xbt_dynar_cursor_step( g->edges, &cursor);
- }
-
-
- if ((node_free_function) && (n->data))
- node_free_function(n->data);
-
- cursor = 0;
- xbt_dynar_foreach(g->nodes, cursor, node)
- {
- if (node == n)
- xbt_dynar_cursor_rm(g->nodes, &cursor);
+ return node->data;
+}
- }
+/** @brief Set the user data associated to a node */
+void xbt_graph_node_set_data(xbt_node_t node, void *data)
+{
+ node->data = data;
+}
- return;
+/** @brief Get the user data associated to a edge */
+void *xbt_graph_edge_get_data(xbt_edge_t edge)
+{
+ return edge->data;
}
-void xbt_graph_free_edge(xbt_graph_t g, xbt_edge_t e,
- void free_function(void *ptr))
+/** @brief Set the user data associated to a edge */
+void xbt_graph_edge_set_data(xbt_edge_t edge, void *data)
{
- int idx;
- int cursor = 0;
- xbt_edge_t edge = NULL;
-
- if ((free_function) && (e->data))
- free_function(e->data);
-
- xbt_dynar_foreach(g->edges, cursor, edge)
- {
- if (edge == e)
- {
- idx = __xbt_find_in_dynar(edge->dst->in,edge);
- xbt_dynar_remove_at(edge->dst->in, idx,NULL);
- idx = __xbt_find_in_dynar(edge->src->out,edge);
- xbt_dynar_remove_at(edge->src->out,idx,NULL);
- if (!g->directed)
- {
- idx = __xbt_find_in_dynar(edge->src->in,edge);
- xbt_dynar_remove_at(edge->src->in,idx,NULL);
- idx = __xbt_find_in_dynar(edge->dst->out,edge);
- xbt_dynar_remove_at(edge->dst->out,idx,NULL);
- }
- xbt_dynar_cursor_rm(g->edges, &cursor);
- free(edge);
- break;
- }
- }
+ edge->data = data;
}
-int __xbt_find_in_dynar(xbt_dynar_t dynar, void *p)
+/** @brief Destructor
+ * @param g: poor victim
+ * @param node_free_function: function to use to free data associated to each node
+ * @param edge_free_function: function to use to free data associated to each edge
+ * @param graph_free_function: function to use to free data associated to g
+ *
+ * Free the graph structure.
+ */
+void xbt_graph_free_graph(xbt_graph_t g, void_f_pvoid_t node_free_function, void_f_pvoid_t edge_free_function,
+ void_f_pvoid_t graph_free_function)
{
+ unsigned int cursor;
+ xbt_node_t node;
+ xbt_edge_t edge;
- int cursor = 0;
- void *tmp=NULL;
+ xbt_dynar_foreach(g->edges, cursor, edge) {
+ if (edge_free_function)
+ edge_free_function(edge->data);
+ free(edge);
+ }
+ xbt_dynar_free(&(g->edges));
- xbt_dynar_foreach(dynar, cursor, tmp)
- {
- if (tmp == p)
- return cursor;
- }
- return -1;
+ xbt_dynar_foreach(g->nodes, cursor, node) {
+ xbt_dynar_free(&(node->out));
+ xbt_dynar_free(&(node->in));
+ if (node_free_function)
+ node_free_function(node->data);
+ free(node);
+ }
+ xbt_dynar_free(&(g->nodes));
+
+ if (graph_free_function)
+ graph_free_function(g->data);
+ free(g);
}
+/** @brief Retrieve the graph's nodes as a dynar */
xbt_dynar_t xbt_graph_get_nodes(xbt_graph_t g)
{
return g->nodes;
}
+/** @brief Retrieve the graph's edges as a dynar */
xbt_dynar_t xbt_graph_get_edges(xbt_graph_t g)
{
return g->edges;
}
+/** @brief Retrieve the node at the source of the given edge */
xbt_node_t xbt_graph_edge_get_source(xbt_edge_t e)
{
-
return e->src;
}
+/** @brief Retrieve the node being the target of the given edge */
xbt_node_t xbt_graph_edge_get_target(xbt_edge_t e)
{
return e->dst;
}
+/** @brief Retrieve the outgoing edges of the given node */
+xbt_dynar_t xbt_graph_node_get_outedges(xbt_node_t n)
+{
+ return n->out;
+}
+/** @brief Set the weight of the given edge */
void xbt_graph_edge_set_length(xbt_edge_t e, double length)
{
e->length = length;
}
-double xbt_graph_edge_get_length(xbt_edge_t e)
+/** @brief Get the length of a edge */
+double xbt_graph_edge_get_length(xbt_edge_t edge)
{
- return e->length;
+ return edge->length;
}
-
-/*construct the adjacency matrix corresponding to a graph,
- the weights are the distances between nodes
+/** @brief Floyd-Warshall algorithm for shortest path finding
+ *
+ * From wikipedia:
+ *
+ * The Floyd–Warshall algorithm takes as input an adjacency matrix representation of a weighted, directed graph (V, E).
+ * The weight of a path between two vertices is the sum of the weights of the edges along that path. The edges E of the
+ * graph may have negative weights, but the graph must not have any negative weight cycles. The algorithm computes, for
+ * each pair of vertices, the minimum weight among all paths between the two vertices. The running time complexity is
+ * Θ(|V|3).
*/
-double *xbt_graph_get_length_matrix(xbt_graph_t g)
+void xbt_floyd_algorithm(xbt_graph_t g, double *adj, double *d, xbt_node_t * p)
{
- int cursor = 0;
- int in_cursor = 0;
- int idx,i;
- unsigned long n;
- xbt_edge_t edge = NULL;
- xbt_node_t node=NULL;
- double *d = NULL;
-
-# define D(u,v) d[(u)*n+(v)]
- n = xbt_dynar_length(g->nodes);
-
- d = (double *) xbt_new0(double, n*n);
-
- for (i = 0; i < n * n; i++)
- {
- d[i] = -1.0;
- }
-
- xbt_dynar_foreach(g->nodes, cursor, node)
- {
- in_cursor = 0;
- D(cursor, cursor) = 0;
-
- xbt_dynar_foreach(node->out, in_cursor, edge)
- {
- if (edge->dst==node)
- idx= __xbt_find_in_dynar(g->nodes, edge->src);
- else /*case of undirected graphs*/
- idx = __xbt_find_in_dynar(g->nodes, edge->dst);
- D( cursor,idx) = edge->length;
- }
- }
-
-# undef D
-
- return d;
-}
-
-
-void xbt_floyd_algorithm(xbt_graph_t g, double *adj, double *d,
- xbt_node_t * p)
-{
- int i, j, k;
+ unsigned long i, j, k;
unsigned long n;
n = xbt_dynar_length(g->nodes);
# define D(u,v) d[(u)*n+(v)]
# define P(u,v) p[(u)*n+(v)]
- for (i = 0; i < n * n; i++)
- {
- d[i] = adj[i];
- }
-
+ for (i = 0; i < n * n; i++) {
+ d[i] = adj[i];
+ }
- for (i = 0; i < n; i++)
- {
- for (j = 0; j < n; j++)
- {
- if (D(i, j) != -1)
- {
- P(i,j) =*((xbt_node_t*) xbt_dynar_get_ptr(g->nodes, i));
- }
- }
- }
-
- for (k = 0; k < n; k++)
- {
- for (i = 0; i < n; i++)
- {
- for (j = 0; j < n; j++)
- {
- if ((D(i, k) != -1) && (D(k, j) != -1))
- {
- if ((D(i, j) == -1) || (D(i, j) > D(i, k) + D(k, j)))
- {
- D(i, j) = D(i, k) + D(k, j);
- P(i, j) = P(k, j);
- }
- }
- }
- }
+ for (i = 0; i < n; i++) {
+ for (j = 0; j < n; j++) {
+ if (D(i, j) != -1) {
+ P(i, j) = *((xbt_node_t *) xbt_dynar_get_ptr(g->nodes, i));
+ }
}
+ }
-
-
-# undef P
-# undef D
-}
-
-/*computes all-pairs shortest paths*/
-xbt_node_t *xbt_graph_shortest_paths(xbt_graph_t g)
-{
- xbt_node_t *p;
- xbt_node_t *r;
- int i, j, k;
- unsigned long n;
-
- double *adj = NULL;
- double *d = NULL;
-
-# define P(u,v) p[(u)*n+(v)]
-# define R(u,v) r[(u)*n+(v)]
-
- n = xbt_dynar_length(g->nodes);
- adj = xbt_graph_get_length_matrix(g);
- d = xbt_new0(double,n*n);
- p = xbt_new0(xbt_node_t,n*n);
- r = xbt_new0(xbt_node_t,n*n);
-
- xbt_floyd_algorithm(g, adj, d, p);
-
- for (i = 0; i < n; i++)
- {
- for (j = 0; j < n; j++)
- {
- k = j;
-
- while ((P(i, k)) && (__xbt_find_in_dynar(g->nodes, P(i, k)) != i))
- {
- k = __xbt_find_in_dynar(g->nodes, P(i, k));
- }
-
- if (P(i, j))
- {
- R(i, j) = *((xbt_node_t*) xbt_dynar_get_ptr(g->nodes, k));
- }
- }
+ for (k = 0; k < n; k++) {
+ for (i = 0; i < n; i++) {
+ for (j = 0; j < n; j++) {
+ if ((D(i, k) != -1) && (D(k, j) != -1)) {
+ if ((D(i, j) == -1) || (D(i, j) > D(i, k) + D(k, j))) {
+ D(i, j) = D(i, k) + D(k, j);
+ P(i, j) = P(k, j);
+ }
+ }
+ }
}
-# undef R
+ }
# undef P
-
- free(d);
- free(p);
- free(adj);
- return r;
-}
-
-
-static xbt_graph_t parsed_graph = NULL;
-static xbt_dict_t parsed_nodes = NULL;
-
-
-static void __parse_graph_begin(void)
-{
- DEBUG0("<graph>");
-}
-static void __parse_graph_end(void)
-{
- DEBUG0("</graph>");
-}
-
-static void __parse_node(void)
-{
- xbt_node_t node =
- xbt_graph_new_node(parsed_graph, (void *) A_graphxml_node_name);
-
- xbt_dict_set(parsed_nodes, A_graphxml_node_name, (void *) node, NULL);
-
- DEBUG1("<node label=\"%s\"/>", (char *) (node->data));
-}
-static void __parse_edge(void)
-{
- xbt_edge_t edge = xbt_graph_new_edge(parsed_graph,
- xbt_dict_get(parsed_nodes,
- A_graphxml_edge_source),
- xbt_dict_get(parsed_nodes,
- A_graphxml_edge_target),
- (void *) A_graphxml_edge_name);
-
- xbt_graph_edge_set_length(edge, atof(A_graphxml_edge_length));
-
- DEBUG4("<edge name=\"%s\" source=\"%s\" target=\"%s\" length=\"%f\"/>",
- (char *) edge->data,
- (char *) (edge->src)->data,
- (char *) (edge->dst)->data,
- xbt_graph_edge_get_length(edge));
-}
-
-xbt_graph_t xbt_graph_read(const char *filename)
-{
- xbt_graph_t graph = xbt_graph_new_graph(1, NULL);
-
- parsed_graph = graph;
- parsed_nodes = xbt_dict_new();
-
-
- xbt_graph_parse_reset_parser();
-
- STag_graphxml_graph_fun = __parse_graph_begin;
- ETag_graphxml_graph_fun = __parse_graph_end;
- ETag_graphxml_node_fun = __parse_node;
- ETag_graphxml_edge_fun = __parse_edge;
-
-
- xbt_graph_parse_open(filename);
- xbt_assert1((!xbt_graph_parse()), "Parse error in %s", filename);
- xbt_graph_parse_close();
-
- xbt_dict_free(&parsed_nodes);
-
- parsed_graph = NULL;
- return graph;
+# undef D
}
-void xbt_graph_export_graphviz(xbt_graph_t g, const char *filename,
- const char *(node_name) (xbt_node_t),
- const char *(edge_name) (xbt_edge_t))
+/** @brief Export the given graph in the GraphViz formatting for visualization */
+void xbt_graph_export_graphviz(xbt_graph_t g, const char *filename, const char *(node_name) (xbt_node_t),
+ const char *(edge_name) (xbt_edge_t))
{
- int cursor = 0;
+ unsigned int cursor = 0;
xbt_node_t node = NULL;
xbt_edge_t edge = NULL;
FILE *file = NULL;
- const char *name=NULL;
+ const char *name = NULL;
- file=fopen(filename,"w");
- xbt_assert1(file, "Failed to open %s \n",filename);
+ file = fopen(filename, "w");
+ xbt_assert(file, "Failed to open %s \n", filename);
- if(g->directed) fprintf(file,"digraph test {\n");
- else fprintf(file,"graph test {\n");
+ if (g->directed)
+ fprintf(file, "digraph test {\n");
+ else
+ fprintf(file, "graph test {\n");
- fprintf(file," graph [overlap=scale]\n");
+ fprintf(file, " graph [overlap=scale]\n");
- fprintf(file," node [shape=box, style=filled]\n");
- fprintf(file," node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
-
- xbt_dynar_foreach(g->nodes, cursor, node) {
- fprintf(file," \"%p\" ", node);
- if((node_name)&&((name=node_name(node)))) fprintf(file,"[label=\"%s\"]",name);
- fprintf(file,";\n");
- }
- xbt_dynar_foreach(g->edges, cursor, edge) {
- if(g->directed)
- fprintf(file," \"%p\" -> \"%p\"",edge->src, edge->dst);
- else
- fprintf(file," \"%p\" -- \"%p\"",edge->src, edge->dst);
- if((edge_name)&&((name=edge_name(edge)))) fprintf(file,"[label=\"%s\"]",name);
- fprintf(file,";\n");
- }
- fprintf(file,"}\n");
- fclose(file);
-}
+ fprintf(file, " node [shape=box, style=filled]\n");
+ fprintf(file, " node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
-void xbt_graph_export_graphxml(xbt_graph_t g, const char *filename,
- const char *(node_name)(xbt_node_t),
- const char *(edge_name)(xbt_edge_t))
-{
- int cursor = 0;
- xbt_node_t node = NULL;
- xbt_edge_t edge = NULL;
- FILE *file = NULL;
- const char *name = NULL;
-
- file=fopen(filename,"w");
- xbt_assert1(file, "Failed to open %s \n",filename);
-
- fprintf(file,"<?xml version='1.0'?>\n");
- fprintf(file,"<!DOCTYPE graph SYSTEM \"graphxml.dtd\">\n");
- fprintf(file,"<graph>\n");
xbt_dynar_foreach(g->nodes, cursor, node) {
- fprintf(file," <node name=\"%p\" ", node);
- if((node_name)&&((name=node_name(node)))) fprintf(file,"label=\"%s\" ",name);
- fprintf(file,">\n");
+ if (node_name){
+ fprintf(file, " \"%s\";\n", node_name(node));
+ }else{
+ fprintf(file, " \"%p\";\n", node);
+ }
}
xbt_dynar_foreach(g->edges, cursor, edge) {
- fprintf(file," <edge source=\"%p\" target =\"%p\" ",
- edge->src, edge->dst );
- if((edge_name)&&((name=edge_name(edge)))) fprintf(file,"label=\"%s\" ",name);
- fprintf(file,">\n");
+ const char *c;
+ const char *c_dir = "->";
+ const char *c_ndir = "--";
+ if (g->directed){
+ c = c_dir;
+ }else{
+ c = c_ndir;
+ }
+ const char *src_name, *dst_name;
+ if (node_name){
+ src_name = node_name(edge->src);
+ dst_name = node_name(edge->dst);
+ fprintf(file, " \"%s\" %s \"%s\"", src_name, c, dst_name);
+ }else{
+ fprintf(file, " \"%p\" %s \"%p\"", edge->src, c, edge->dst);
+ }
+
+ if ((edge_name) && ((name = edge_name(edge))))
+ fprintf(file, "[label=\"%s\"]", name);
+ fprintf(file, ";\n");
}
- fprintf(file,"</graph>\n");
+ fprintf(file, "}\n");
fclose(file);
}
-
