diff --git a/src/target/graph.c b/src/target/graph.c
index ee65f32..443d52b 100644
--- a/src/target/graph.c
+++ b/src/target/graph.c
@@ -16,7 +16,114 @@
 
 
 
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
 #include "target.h"
 
 
 /* graph */
+/* private */
+/* variables */
+static FILE * _fp;
+static char * _filename;
+static char * _function = NULL;
+
+
+/* protected */
+/* prototypes */
+static int _graph_init(char const * outfile, int optlevel);
+static int _graph_exit(void);
+static int _graph_function_begin(char const * name);
+static int _graph_function_call(char const * name);
+static int _graph_function_end(void);
+
+
+/* public */
+/* variables */
+TargetPlugin target_plugin =
+{
+	NULL,
+	_graph_init,
+	_graph_exit,
+	NULL,
+	_graph_function_begin,
+	_graph_function_call,
+	_graph_function_end
+};
+
+
+/* protected */
+/* functions */
+/* graph_init */
+static int _graph_init(char const * outfile, int optlevel)
+{
+#ifdef DEBUG
+	fprintf(stderr, "%s(\"%s\", %d)\n", __func__, outfile, optlevel);
+#endif
+	if((_filename = strdup(outfile)) == NULL)
+		return error_set_code(1, "%s", strerror(errno));
+	if((_fp = fopen(outfile, "w")) == NULL)
+	{
+		free(_filename);
+		return error_set_code(1, "%s: %s", outfile, strerror(errno));
+	}
+	fprintf(_fp, "%s", "digraph G {\n");
+	return 0;
+}
+
+
+/* graph_exit */
+static int _graph_exit(void)
+{
+	int ret = 0;
+
+#ifdef DEBUG
+	fprintf(stderr, "%s()\n", __func__);
+#endif
+	fprintf(_fp, "%s", "}\n");
+	if(fclose(_fp) != 0)
+		ret |= error_set_code(1, "%s: %s", _filename, strerror(errno));
+	free(_filename);
+	free(_function);
+	return 0;
+}
+
+
+/* graph_function_begin */
+static int _graph_function_begin(char const * name)
+{
+	int ret = 0;
+
+#ifdef DEBUG
+	fprintf(stderr, "%s(\"%s\")\n", __func__, name);
+#endif
+	free(_function);
+	if((_function = strdup(name)) == NULL)
+		ret = error_set_code(1, "%s", strerror(errno));
+	return ret;
+}
+
+
+/* graph_function_call */
+static int _graph_function_call(char const * name)
+{
+#ifdef DEBUG
+	fprintf(stderr, "%s(\"%s\")\n", __func__, name);
+#endif
+	fprintf(_fp, "\t%s%s%s%s", _function, " => ", name, ";\n");
+	return 0;
+}
+
+
+/* graph_function_end */
+static int _graph_function_end(void)
+{
+#ifdef DEBUG
+	fprintf(stderr, "%s()\n", __func__);
+#endif
+	free(_function);
+	_function = NULL;
+	return 0;
+}