2 * Interblock liveness analysis.
3 * @author Sebastian Hack
11 #include "firm_types.h"
23 typedef struct _be_lv_t be_lv_t;
25 typedef struct _be_lv_info_t be_lv_info_t;
29 * Compute the inter block liveness for a graph.
30 * @param irg The graph.
32 be_lv_t *be_liveness(ir_graph *irg);
35 * Check the given liveness information against a freshly computed one.
37 void be_liveness_check(be_lv_t *lv);
40 * Free the liveness information.
42 void be_liveness_free(be_lv_t *lv);
45 * Recompute the complete liveness information.
47 void be_liveness_recompute(be_lv_t *lv);
50 * Update the liveness information for a single node.
51 * It is irrelevant if there is liveness information present for the node.
52 * The liveness information for the node is firstly deleted and then recompute.
53 * So, if the node is fresh and never recorded inf the liveness information
54 * before, it is more efficient to call be_liveness_introduce().
56 void be_liveness_update(be_lv_t *lv, ir_node *irn);
59 * Remove a node from the liveness information.
61 void be_liveness_remove(be_lv_t *lv, ir_node *irn);
64 * Introduce a new node to the liveness information.
65 * The new irn is not deleted from any block's liveness information, so it must be fresh!
66 * @param lv The liveness info.
67 * @param irn The node.
69 void be_liveness_introduce(be_lv_t *lv, ir_node *irn);
72 * Dump the liveness information for a graph.
73 * @param f The output.
74 * @param irg The graph.
76 void be_liveness_dump(const be_lv_t *lv, FILE *f);
79 * Dump the liveness information for a graph.
80 * @param irg The graph.
81 * @param cls_name A string used as substring in the filename.
83 void be_liveness_dumpto(const be_lv_t *lv, const char *cls_name);
86 * Check, if a node is live in at a block.
87 * @param block The block.
88 * @param irn The node to check for.
89 * @return 1, if @p irn is live at the entrance of @p block, 0 if not.
91 int (be_is_live_in)(const be_lv_t *lv, const ir_node *block, const ir_node *irn);
94 * Check, if a node is live out at a block.
95 * @param block The block.
96 * @param irn The node to check for.
97 * @return 1, if @p irn is live at the exit of @p block, 0 if not.
99 int (be_is_live_out)(const be_lv_t *lv, const ir_node *block, const ir_node *irn);
102 * Check, if a node is live at the end of a block.
103 * @param block The block.
104 * @param irn The node to check for.
105 * @return 1, if @p irn is live at the end of the block, 0 if not.
107 int (be_is_live_end)(const be_lv_t *lv, const ir_node *block, const ir_node *irn);
110 * Check, if the SSA dominance property is fulfilled.
111 * @param irg The graph.
113 void be_check_dominance(ir_graph *irg);
116 * The liveness transfer function.
117 * Updates a live set over a single step from a given node to its predecessor.
118 * Everything defined at the node is removed from the set, the uses of the node get inserted.
119 * @param arch_env The architecture environment.
120 * @param cls The register class to consider.
121 * @param irn The node at which liveness should be computed.
122 * @param live The set of nodes live before @p irn. This set gets modified by updating it to
123 * the nodes live after irn.
126 pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live);
129 * Put all node live at the end of a block into a set.
130 * @param arch_env The architecture environment.
131 * @param cls The register class to consider.
132 * @param bl The block.
133 * @param live The set to put them into.
136 pset *be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live);
139 * Compute a set of nodes which are live at another node.
140 * @param arch_env The architecture environment.
141 * @param cls The register class to consider.
142 * @param pos The node.
143 * @param live The set to put them into.
146 pset *be_liveness_nodes_live_at(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live);
150 * FIXME: Need comment
152 void be_liveness_add_missing(be_lv_t *lv);
154 #endif /* _BELIVE_H */