+
+/**
+ * Sets the debug information of a node.
+ *
+ * @param n The node.
+ * @param db The debug info.
+ */
+void set_irn_dbg_info(ir_node *n, dbg_info *db);
+
+/**
+ * Returns the debug information of an node.
+ *
+ * @param n The node.
+ */
+dbg_info *get_irn_dbg_info(const ir_node *n);
+
+/**
+ * Sets the debug information of an entity.
+ *
+ * @param ent The entity.
+ * @param db The debug info.
+ */
+void set_entity_dbg_info(ir_entity *ent, dbg_info *db);
+
+/**
+ * Returns the debug information of an entity.
+ *
+ * @param ent The entity.
+ */
+dbg_info *get_entity_dbg_info(const ir_entity *ent);
+
+/**
+ * Sets the debug information of a type.
+ *
+ * @param tp The type.
+ * @param db The debug info.
+ */
+void set_type_dbg_info(ir_type *tp, dbg_info *db);
+
+/**
+ * Returns the debug information of a type.
+ *
+ * @param tp The type.
+ */
+dbg_info *get_type_dbg_info(const ir_type *tp);
+
+/**
+ * An enumeration indicating the action performed by a transformation.
+ */
+typedef enum {
+ dbg_error = 0,
+ dbg_opt_ssa, /**< Optimization of the SSA representation, e.g. removal of superfluent Phi nodes. */
+ dbg_opt_auxnode, /**< Removal of unnecessary auxiliary nodes. */
+ dbg_const_eval, /**< A Firm subgraph was evaluated to a single constant. */
+ dbg_opt_cse, /**< A Firm node was replaced due to common subexpression elimination. */
+ dbg_straightening, /**< A Firm subgraph was replaced by a single, existing block. */
+ dbg_if_simplification, /**< The control flow of an if is changed as either the
+ else, the then or both blocks are empty. */
+ dbg_algebraic_simplification, /**< A Firm subgraph was replaced because of an algebraic
+ simplification. */
+ dbg_write_after_write, /**< A Firm subgraph was replaced because of a write
+ after write optimization. */
+ dbg_write_after_read, /**< A Firm subgraph was replaced because of a write
+ after read optimization. */
+ dbg_read_after_write, /**< A Firm subgraph was replaced because of a read
+ after write optimization. */
+ dbg_read_after_read, /**< A Firm subgraph was replaced because of a read
+ after read optimization. */
+ dbg_read_a_const, /**< A Firm subgraph was replaced because of a read
+ a constant optimization. */
+ dbg_rem_poly_call, /**< Remove polymorphic call. */
+ dbg_dead_code, /**< Removing unreachable code, I.e. blocks that are never executed. */
+ dbg_opt_confirm, /**< A Firm subgraph was replace because of a Confirmation. */
+ dbg_backend, /**< A Firm subgraph was replaced because of a Backend transformation */
+ dbg_max /**< Maximum value. */
+} dbg_action;
+
+/**
+ * Converts a debug_action into a string.
+ *
+ * @param a the debug action
+ */
+const char *dbg_action_2_str(dbg_action a);
+
+/**
+ * The type of the debug info merge function.
+ *
+ * @param new_node the new ir node
+ * @param old_node the old ir node
+ * @param action the action that triggers the merge
+ *
+ * @see dbg_init()
+ */
+typedef void merge_pair_func(ir_node *new_node, ir_node *old_node, dbg_action action);
+
+/**
+ * The type of the debug info merge sets function.
+ *
+ * @param new_node_array array of new nodes
+ * @param new_num_entries number of entries in new_node_array
+ * @param old_node_array array of old nodes
+ * @param old_num_entries number of entries in old_node_array
+ * @param action the action that triggers the merge
+ *
+ * @see dbg_init()
+ */
+typedef void merge_sets_func(ir_node **new_node_array, int new_num_entries, ir_node **old_node_array, int old_num_entries, dbg_action action);
+
+/**
+ * The type of the debug info to human readable string function.
+ *
+ * @param buf pointer to a buffer that will hold the info
+ * @param len length of the buffer
+ * @param dbg the debug info
+ *
+ * @return Number of written characters to the buffer.
+ *
+ * @see dbg_init()
+ */
+typedef unsigned snprint_dbg_func(char *buf, unsigned len, const dbg_info *dbg);
+
+/**
+ * Initializes the debug support.
+ *
+ * @param dbg_info_merge_pair see function description
+ * @param dbg_info_merge_sets see function description
+ * @param snprint_dbg see function description
+ *
+ * This function takes pointers to two functions that merge the
+ * debug information when a
+ * transformation of a Firm graph is performed.
+ * Firm transformations call one of these functions.
+ *
+ * - dbg_info_merge_pair() is called in the following situation:
+ * The optimization replaced the old node by the new one. The new node
+ * might be a recent allocated node not containing any debug information,
+ * or just another node from somewhere in the graph with the same
+ * semantics.
+ * - dbg_info_merge_sets() is called in the following situation:
+ * The optimization replaced a subgraph by another subgraph. There is no
+ * obviously mapping between single nodes in both subgraphs. The optimization
+ * simply passes two lists to the debug module, one containing the nodes in
+ * the old subgraph, the other containing the nodes in the new subgraph.
+ * The same node can be in both lists.
+ *
+ * Further both functions pass an enumeration indicating the action
+ * performed by the transformation, e.g. the kind of optimization performed.
+ *
+ * The third argument snprint_dbg is called to convert a debug info into a human readable string.
+ * This string is the dumped in the dumper functions.
+ *
+ * Note that if NULL is passed for dbg_info_merge_pair or dbg_info_merge_sets, the default
+ * implementations default_dbg_info_merge_pair() and default_dbg_info_merge_sets() are used.
+ * NULL passed for snprint_dbg means no output.
+ */
+void dbg_init(merge_pair_func *dbg_info_merge_pair, merge_sets_func *dbg_info_merge_sets, snprint_dbg_func *snprint_dbg);
+
+/**
+ * The default merge_pair_func implementation, simply copies the debug info
+ * from the old Firm node to the new one if the new one does not have debug info yet.
+ *
+ * @param nw The new Firm node.
+ * @param old The old Firm node.
+ * @param info The action that cause old node to be replaced by new one.
+ */
+void default_dbg_info_merge_pair(ir_node *nw, ir_node *old, dbg_action info);
+
+/**
+ * The default merge_sets_func implementation. If n_old_nodes is equal 1, copies
+ * the debug info from the old node to all new ones (if they do not have one), else does nothing.
+ *
+ * @param new_nodes An array of new Firm nodes.
+ * @param n_new_nodes The length of the new_nodes array.
+ * @param old_nodes An array of old (replaced) Firm nodes.
+ * @param n_old_nodes The length of the old_nodes array.
+ * @param info The action that cause old node to be replaced by new one.
+ */
+void default_dbg_info_merge_sets(ir_node **new_nodes, int n_new_nodes,
+ ir_node **old_nodes, int n_old_nodes,
+ dbg_action info);
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif