-/* Executes irg_walk(end, pre, post, env) for all irgraphs in irprog.
- Sets current_ir_graph properly for each walk. Conserves current
- current_ir_graph. In interprocedural view nodes can be visited several
- times. */
-void all_irg_walk(irg_walk_func pre, irg_walk_func post, void *env);
+/** Allocates some necessary datastructures. */
+void init_ip_walk(void);
+
+/** Frees some necessary datastructures. */
+void finish_ip_walk(void);
+
+/**
+ * Walks over the ir graph.
+ *
+ * @param node - the start node
+ * @param pre - walker function, executed before the predecessor of a node are visited
+ * @param post - walker function, executed after the predecessor of a node are visited
+ * @param env - environment, passend to pre and post
+ *
+ * Walks over the ir graph, starting at the node given as first argument.
+ * Executes pre before visiting the predecessor of a node, post after.
+ * irg_walk uses the visited flag in irg and the nodes to determine visited
+ * nodes. It executes inc_irg_visited(current_ir_graph) to generate a new
+ * flag. It marks the node as visited before executing pre.
+ * The void* env can be used to pass status information between the
+ * pre and post functions. Does not use the link field.
+ */
+void irg_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env);
+
+/**
+ * Walks over all reachable nodes in the ir graph.
+ *
+ * @param irg - the irg graph
+ * @param pre - walker function, executed before the predecessor of a node are visited
+ * @param post - walker function, executed after the predecessor of a node are visited
+ * @param env - environment, passend to pre and post
+ *
+ * Like irg_walk(), but walks over all reachable nodes in the ir
+ * graph, starting at the end operation. During the walk current_ir_graph
+ * is set to irg. Does not use the link field. If interprocedural_view
+ * is set, visits all reachable irgs.
+ */
+void irg_walk_graph(ir_graph *irg, irg_walk_func *pre, irg_walk_func *post, void *env);