3 * File name: ir/debug/dbginfo.h
4 * Purpose: Implements the Firm interface to debug information.
5 * Author: Goetz Lindenmaier
6 * Modified by: Michael Beck
9 * Copyright: (c) 2001-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
16 * This is the Firm interface to debugging support.
18 * @author Goetz Lindenmaier
20 * Firm requires a debugging module fulfilling this interface, else no
21 * debugging information is passed to the backend.
22 * The interface requires a datatype representing the debugging
23 * information. Firm supports administrating a reference to the debug
24 * information in every firm node. Further Firm optimizations call
25 * routines to propagate debug information from old nodes to new nodes
26 * if the optimization replaces the old ones by the new ones.
33 #include "firm_types.h"
41 * @defgroup debug The Firm interface to debugging support.
47 * An abstract data type containing information for
50 * This opaque data type is not defined anywhere in the firm library,
51 * but pointers to this type can be stored in firm nodes.
53 typedef struct dbg_info dbg_info;
56 * Sets the debug information of a node.
58 void set_irn_dbg_info(ir_node *n, dbg_info *db);
61 * Returns the debug information of an node.
63 dbg_info *get_irn_dbg_info(ir_node *n);
66 * Sets the debug information of an entity.
68 void set_entity_dbg_info(entity *ent, dbg_info *db);
71 * Returns the debug information of an entity.
73 dbg_info *get_entity_dbg_info(entity *ent);
76 * Sets the debug information of a type.
78 void set_type_dbg_info(ir_type *tp, dbg_info *db);
81 * Returns the debug information of a type.
83 dbg_info *get_type_dbg_info(ir_type *tp);
86 * An enumeration indicating the action performed by a transformation.
90 dbg_opt_ssa, /**< Optimization of the SSA representation, e.g., removal of superfluent phi nodes. */
91 dbg_opt_auxnode, /**< Removal of unnecessary auxiliary nodes. */
92 dbg_const_eval, /**< A Firm subgraph was evaluated to a single constant. */
93 dbg_opt_cse, /**< A Firm node was replaced due to common subexpression elimination. */
94 dbg_straightening, /**< A Firm subgraph was replaced by a single, existing block. */
95 dbg_if_simplification, /**< The control flow of an if is changed as either the
96 else, the then or both blocks are empty. */
97 dbg_algebraic_simplification, /**< A Firm subgraph was replaced because of an algebraic
99 dbg_write_after_write, /**< A Firm subgraph was replaced because of a write
100 after write optimization. */
101 dbg_write_after_read, /**< A Firm subgraph was replaced because of a write
102 after read optimization. */
103 dbg_read_after_write, /**< A Firm subgraph was replaced because of a read
104 after write optimization. */
105 dbg_read_after_read, /**< A Firm subgraph was replaced because of a read
106 after read optimization. */
107 dbg_read_a_const, /**< A Firm subgraph was replaced because of a read
108 a constant optimization. */
109 dbg_rem_poly_call, /**< Remove polymorphic call. */
110 dbg_dead_code, /**< Removing unreachable code, I.e. blocks that are never executed. */
111 dbg_opt_confirm, /**< A Firm subgraph was replace because of a Confirmation */
112 dbg_backend, /**< Backend transformation */
113 dbg_max /**< Maximum value. */
117 * Converts a debug_action into a string.
119 * @param a the debug action
121 const char *dbg_action_2_str(dbg_action a);
124 * The type of the debug info merge function.
126 * @param new_node the new ir node
127 * @param old_node the old ir node
128 * @param action the action that triggers the merge
132 typedef void merge_pair_func(ir_node *new_node, ir_node *old_node, dbg_action action);
135 * The type of the debug info merge sets function.
137 * @param new_node_array array of new nodes
138 * @param new_num_entries number of entries in new_node_array
139 * @param old_node_array array of old nodes
140 * @param old_num_entries number of entries in old_node_array
141 * @param action the action that triggers the merge
145 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);
148 * The type of the debug info to human readable string function.
150 * @param buf pointer to a buffer that will hold the info
151 * @param len length of the buffer
152 * @param dbg the debug info
154 * @return Number of written characters to the buffer.
158 typedef unsigned snprint_dbg_func(char *buf, unsigned len, const dbg_info *dbg);
161 * Initializes the debug support.
163 * @param dbg_info_merge_pair see function description
164 * @param dbg_info_merge_sets see function description
165 * @param snprint_dbg see function description
167 * This function takes Pointers to two functions that merge the
168 * debug information when a
169 * transformation of a firm graph is performed.
170 * Firm transformations call one of these functions.
172 * - dbg_info_merge_pair() is called in the following situation:
173 * The optimization replaced the old node by the new one. The new node
174 * might be a recent allocated node not containing any debug information,
175 * or just another node from somewhere in the graph with the same
177 * - dbg_info_merge_sets() is called in the following situation:
178 * The optimization replaced a subgraph by another subgraph. There is no
179 * obviously mapping between single nodes in both subgraphs. The optimization
180 * simply passes two lists to the debug module, one containing the nodes in
181 * the old subgraph, the other containing the nodes in the new subgraph.
182 * The same node can be in both lists.
184 * Further both functions pass an enumeration indicating the action
185 * performed by the transformation, e.g. the kind of optimization performed.
187 * The third argument snprint_dbg is called to convert a debug info into a human readable string.
188 * This string is the dumped in the dumper functions.
190 * Note that if NULL is passed for dbg_info_merge_pair or dbg_info_merge_sets, the default
191 * implementations default_dbg_info_merge_pair() and default_dbg_info_merge_sets() are used.
192 * NULL passed for snprint_dbg means no output.
194 void dbg_init(merge_pair_func *dbg_info_merge_pair, merge_sets_func *dbg_info_merge_sets, snprint_dbg_func *snprint_dbg);
199 * The default merge_pair_func implementation, simply copies the debug info
202 void default_dbg_info_merge_pair(ir_node *nw, ir_node *old, dbg_action info);
205 * The default merge_sets_func implementation, does nothing
207 void default_dbg_info_merge_sets(ir_node **new_nodes, int n_new_nodes,
208 ir_node **old_nodes, int n_old_nodes,
215 #endif /* _DBGINFO_H_ */