+
+void be_liveness_recompute(be_lv_t *lv)
+{
+ unsigned last_idx;
+
+ BE_TIMER_PUSH(t_live);
+ last_idx = get_irg_last_idx(lv->irg);
+ if(last_idx >= bitset_size(lv->nodes)) {
+ bitset_free(lv->nodes);
+ lv->nodes = bitset_malloc(last_idx * 2);
+ } else
+ bitset_clear_all(lv->nodes);
+
+ phase_free(&lv->ph);
+ phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL);
+ compute_liveness(lv);
+
+ BE_TIMER_POP(t_live);
+}
+
+
+void be_liveness_free(be_lv_t *lv)
+{
+ be_liveness_invalidate(lv);
+#ifdef USE_LIVE_CHK
+ lv_chk_free(lv->lvc);
+ dfs_free(lv->dfs);
+#endif
+ xfree(lv);
+}
+
+void be_liveness_remove(be_lv_t *lv, const ir_node *irn)
+{
+ if (lv->nodes) {
+ unsigned idx = get_irn_idx(irn);
+ lv_remove_walker_t w;
+
+ /*
+ * Removes a single irn from the liveness information.
+ * Since an irn can only be live at blocks dominated by the block of its
+ * definition, we only have to process that dominance subtree.
+ */
+ w.lv = lv;
+ w.irn = irn;
+ dom_tree_walk(get_nodes_block(irn), lv_remove_irn_walker, NULL, &w);
+ if(idx < bitset_size(lv->nodes))
+ bitset_clear(lv->nodes, idx);
+ }
+}
+
+void be_liveness_introduce(be_lv_t *lv, ir_node *irn)
+{
+ if (lv->nodes) {
+ struct _lv_walker_t w;
+ w.lv = lv;
+ w.data = bitset_malloc(get_irg_last_idx(lv->irg));
+ liveness_for_node(irn, &w);
+ bitset_free(w.data);
+ }
+}
+
+void be_liveness_update(be_lv_t *lv, ir_node *irn)
+{
+ be_liveness_remove(lv, irn);
+ be_liveness_introduce(lv, irn);
+}
+
+static void lv_check_walker(ir_node *bl, void *data)
+{
+ struct _lv_walker_t *w = data;
+ be_lv_t *lv = w->lv;
+ be_lv_t *fresh = w->data;
+
+ struct _be_lv_info_t *curr = phase_get_irn_data(&lv->ph, bl);
+ struct _be_lv_info_t *fr = phase_get_irn_data(&fresh->ph, bl);
+
+ if(!fr && curr && curr[0].u.head.n_members > 0) {
+ unsigned i;
+
+ ir_fprintf(stderr, "%+F liveness should be empty but current liveness contains:\n", bl);
+ for(i = 0; i < curr[0].u.head.n_members; ++i) {
+ ir_fprintf(stderr, "\t%+F\n", get_idx_irn(lv->irg, curr[1 + i].u.node.idx));
+ }
+ }
+
+ else if(curr) {
+ unsigned n_curr = curr[0].u.head.n_members;
+ unsigned n_fresh = fr[0].u.head.n_members;
+
+ unsigned i;
+
+ if(n_curr != n_fresh) {
+ ir_fprintf(stderr, "%+F: liveness set sizes differ. curr %d, correct %d\n", bl, n_curr, n_fresh);
+
+ ir_fprintf(stderr, "current:\n");
+ for(i = 0; i < n_curr; ++i) {
+ struct _be_lv_info_node_t *n = &curr[1 + i].u.node;
+ ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+ }
+
+ ir_fprintf(stderr, "correct:\n");
+ for(i = 0; i < n_fresh; ++i) {
+ struct _be_lv_info_node_t *n = &fr[1 + i].u.node;
+ ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+ }
+ }
+ }
+}
+
+void be_liveness_check(be_lv_t *lv)
+{
+ struct _lv_walker_t w;
+ be_lv_t *fresh = be_liveness(lv->birg);
+
+ w.lv = lv;
+ w.data = fresh;
+ irg_block_walk_graph(lv->irg, lv_check_walker, NULL, &w);
+ be_liveness_free(fresh);
+}
+
+
+static void lv_dump_block_walker(ir_node *irn, void *data)
+{
+ struct _lv_walker_t *w = data;
+ if(is_Block(irn))
+ lv_dump_block(w->lv, w->data, irn);
+}
+
+
+/* Dump the liveness information for a graph. */
+void be_liveness_dump(const be_lv_t *lv, FILE *f)
+{
+ struct _lv_walker_t w;
+
+ w.lv = (be_lv_t *) lv;
+ w.data = f;
+ irg_block_walk_graph(lv->irg, lv_dump_block_walker, NULL, &w);
+}
+
+/* Dump the liveness information for a graph. */
+void be_liveness_dumpto(const be_lv_t *lv, const char *cls_name)
+{
+ FILE *f;
+ char buf[128];
+ ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", lv->irg, cls_name);
+ if((f = fopen(buf, "wt")) != NULL) {
+ be_liveness_dump(lv, f);
+ fclose(f);
+ }
+}
+
+/**
+ * Walker: checks the every predecessors of a node dominate
+ * the note.
+ */
+static void dom_check(ir_node *irn, void *data)
+{
+ int *problem_found = data;
+
+ if(!is_Block(irn) && irn != get_irg_end(get_irn_irg(irn))) {
+ int i, n;
+ ir_node *bl = get_nodes_block(irn);
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *op = get_irn_n(irn, i);
+ ir_node *def_bl = get_nodes_block(op);
+ ir_node *use_bl = bl;
+
+ if(is_Phi(irn))
+ use_bl = get_Block_cfgpred_block(bl, i);
+
+ if(get_irn_opcode(use_bl) != iro_Bad
+ && get_irn_opcode(def_bl) != iro_Bad
+ && !block_dominates(def_bl, use_bl)) {
+ ir_fprintf(stderr, "Verify warning: %+F in %+F must dominate %+F for user %+F (%s)\n", op, def_bl, use_bl, irn, get_irg_dump_name(get_irn_irg(op)));
+ *problem_found = 1;
+ }
+ }
+ }
+}
+
+/* Check, if the SSA dominance property is fulfilled. */
+int be_check_dominance(ir_graph *irg)
+{
+ int problem_found = 0;
+
+ assure_doms(irg);
+ irg_walk_graph(irg, dom_check, NULL, &problem_found);
+
+ return !problem_found;
+}
+
+void be_liveness_transfer(const arch_env_t *arch_env,
+ const arch_register_class_t *cls,
+ ir_node *node, ir_nodeset_t *nodeset)
+{
+ int i, arity;
+
+ /* You should better break out of your loop when hitting the first phi
+ * function. */
+ assert(!is_Phi(node) && "liveness_transfer produces invalid results for phi nodes");
+
+ if (get_irn_mode(node) == mode_T) {
+ const ir_edge_t *edge;
+
+ foreach_out_edge(node, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ if (arch_irn_consider_in_reg_alloc(arch_env, cls, proj)) {
+ ir_nodeset_remove(nodeset, proj);
+ }
+ }
+ } else if (arch_irn_consider_in_reg_alloc(arch_env, cls, node)) {
+ ir_nodeset_remove(nodeset, node);
+ }
+
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; ++i) {
+ ir_node *op = get_irn_n(node, i);
+
+ if (arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+ ir_nodeset_insert(nodeset, op);
+ }
+}
+
+
+
+void 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 *block, ir_nodeset_t *live)
+{
+ int i;
+
+ assert(lv->nodes && "live sets must be computed");
+ be_lv_foreach(lv, block, be_lv_state_end, i) {
+ ir_node *node = be_lv_get_irn(lv, block, i);
+ if(!arch_irn_consider_in_reg_alloc(arch_env, cls, node))
+ continue;
+
+ ir_nodeset_insert(live, node);
+ }
+}
+
+
+
+void 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, ir_nodeset_t *live)
+{
+ const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+ ir_node *irn;
+
+ be_liveness_end_of_block(lv, arch_env, cls, bl, live);
+ sched_foreach_reverse(bl, irn) {
+ /*
+ * If we encounter the node we want to insert the Perm after,
+ * exit immediately, so that this node is still live
+ */
+ if(irn == pos)
+ return;
+
+ be_liveness_transfer(arch_env, cls, irn, live);
+ }
+}
+
+void be_liveness_nodes_live_at_input(const be_lv_t *lv,
+ const arch_env_t *arch_env,
+ const arch_register_class_t *cls,
+ const ir_node *pos, ir_nodeset_t *live)
+{
+ const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+ ir_node *irn;
+
+ assert(lv->nodes && "live sets must be computed");
+ be_liveness_end_of_block(lv, arch_env, cls, bl, live);
+ sched_foreach_reverse(bl, irn) {
+ be_liveness_transfer(arch_env, cls, irn, live);
+ if(irn == pos)
+ return;
+ }
+}
+
+static void collect_node(ir_node *irn, void *data)
+{
+ struct obstack *obst = data;
+ obstack_ptr_grow(obst, irn);
+}
+
+void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc)
+{
+ ir_graph *irg = lv->irg;
+
+ struct obstack obst;
+ ir_node **nodes;
+ ir_node **blocks;
+ int i, j;
+
+ obstack_init(&obst);
+
+ irg_block_walk_graph(irg, collect_node, NULL, &obst);
+ obstack_ptr_grow(&obst, NULL);
+ blocks = obstack_finish(&obst);
+
+ irg_walk_graph(irg, collect_node, NULL, &obst);
+ obstack_ptr_grow(&obst, NULL);
+ nodes = obstack_finish(&obst);
+
+ stat_ev_ctx_push("be_lv_chk_compare");
+ for (j = 0; nodes[j]; ++j) {
+ ir_node *irn = nodes[j];
+ for (i = 0; blocks[i]; ++i) {
+ ir_node *bl = blocks[i];
+
+ if (!is_Block(irn)) {
+ int lvr_in = be_is_live_in (lv, bl, irn);
+ int lvr_out = be_is_live_out(lv, bl, irn);
+ int lvr_end = be_is_live_end(lv, bl, irn);
+
+ int lvc_in = lv_chk_bl_in (lvc, bl, irn);
+ int lvc_out = lv_chk_bl_out(lvc, bl, irn);
+ int lvc_end = lv_chk_bl_end(lvc, bl, irn);
+
+ if (lvr_in - lvc_in != 0)
+ ir_fprintf(stderr, "live in info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_in, lvc_in);
+
+ if (lvr_end - lvc_end != 0)
+ ir_fprintf(stderr, "live end info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_end, lvc_end);
+
+ if (lvr_out - lvc_out != 0)
+ ir_fprintf(stderr, "live out info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_out, lvc_out);
+ }
+ }
+ }
+ stat_ev_ctx_pop("be_lv_chk_compare");
+
+ obstack_free(&obst, NULL);
+}
+
+void be_init_live(void)
+{
+ FIRM_DBG_REGISTER(dbg, "firm.be.liveness");
+}
+
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_live);