-/**
- * Returns the accessed component graph path for an
- * node computing an address.
- *
- * @param ptr the node computing the address
- * @param depth current depth in steps upward from the root
- * of the address
- */
-static compound_graph_path *rec_get_accessed_path(ir_node *ptr, int depth)
-{
- compound_graph_path *res = NULL;
- ir_entity *root, *field, *ent;
- int path_len, pos, idx;
- tarval *tv;
- ir_type *tp;
-
- if (is_SymConst(ptr)) {
- /* a SymConst. If the depth is 0, this is an access to a global
- * entity and we don't need a component path, else we know
- * at least its length.
- */
- assert(get_SymConst_kind(ptr) == symconst_addr_ent);
- root = get_SymConst_entity(ptr);
- res = (depth == 0) ? NULL : new_compound_graph_path(get_entity_type(root), depth);
- } else if (is_Sel(ptr)) {
- /* it's a Sel, go up until we find the root */
- res = rec_get_accessed_path(get_Sel_ptr(ptr), depth+1);
- if (res == NULL)
- return NULL;
-
- /* fill up the step in the path at the current position */
- field = get_Sel_entity(ptr);
- path_len = get_compound_graph_path_length(res);
- pos = path_len - depth - 1;
- set_compound_graph_path_node(res, pos, field);
-
- if (is_Array_type(get_entity_owner(field))) {
- assert(get_Sel_n_indexs(ptr) == 1 && "multi dim arrays not implemented");
- set_compound_graph_path_array_index(res, pos, get_Sel_array_index_long(ptr, 0));
- }
- } else if (is_Add(ptr)) {
- ir_node *l = get_Add_left(ptr);
- ir_node *r = get_Add_right(ptr);
- ir_mode *mode = get_irn_mode(ptr);
- tarval *tmp;
-
- if (is_Const(r) && get_irn_mode(l) == mode) {
- ptr = l;
- tv = get_Const_tarval(r);
- } else {
- ptr = r;
- tv = get_Const_tarval(l);
- }
-ptr_arith:
- mode = get_tarval_mode(tv);
- tmp = tv;
-
- /* ptr must be a Sel or a SymConst, this was checked in find_constant_entity() */
- if (is_Sel(ptr)) {
- field = get_Sel_entity(ptr);
- } else {
- field = get_SymConst_entity(ptr);
- }
- idx = 0;
- for (ent = field;;) {
- unsigned size;
- tarval *sz, *tv_index, *tlower, *tupper;
- ir_node *bound;
-
- tp = get_entity_type(ent);
- if (! is_Array_type(tp))
- break;
- ent = get_array_element_entity(tp);
- size = get_type_size_bytes(get_entity_type(ent));
- sz = new_tarval_from_long(size, mode);
-
- tv_index = tarval_div(tmp, sz);
- tmp = tarval_mod(tmp, sz);
-
- if (tv_index == tarval_bad || tmp == tarval_bad)
- return NULL;
-
- assert(get_array_n_dimensions(tp) == 1 && "multiarrays not implemented");
- bound = get_array_lower_bound(tp, 0);
- tlower = computed_value(bound);
- bound = get_array_upper_bound(tp, 0);
- tupper = computed_value(bound);
-
- if (tlower == tarval_bad || tupper == tarval_bad)
- return NULL;
-
- if (tarval_cmp(tv_index, tlower) & pn_Cmp_Lt)
- return NULL;
- if (tarval_cmp(tupper, tv_index) & pn_Cmp_Lt)
- return NULL;
-
- /* ok, bounds check finished */
- ++idx;
- }
- if (! tarval_is_null(tmp)) {
- /* access to some struct/union member */
- return NULL;
- }
-
- /* should be at least ONE array */
- if (idx == 0)
- return NULL;
-
- res = rec_get_accessed_path(ptr, depth + idx);
- if (res == NULL)
- return NULL;
-
- path_len = get_compound_graph_path_length(res);
- pos = path_len - depth - idx;
-
- for (ent = field;;) {
- unsigned size;
- tarval *sz, *tv_index;
- long index;
-
- tp = get_entity_type(ent);
- if (! is_Array_type(tp))
- break;
- ent = get_array_element_entity(tp);
- set_compound_graph_path_node(res, pos, ent);
-
- size = get_type_size_bytes(get_entity_type(ent));
- sz = new_tarval_from_long(size, mode);
-
- tv_index = tarval_div(tv, sz);
- tv = tarval_mod(tv, sz);
-
- /* worked above, should work again */
- assert(tv_index != tarval_bad && tv != tarval_bad);
-
- /* bounds already checked above */
- index = get_tarval_long(tv_index);
- set_compound_graph_path_array_index(res, pos, index);
- ++pos;
- }
- } else if (is_Sub(ptr)) {
- ir_node *l = get_Sub_left(ptr);
- ir_node *r = get_Sub_right(ptr);
-
- ptr = l;
- tv = get_Const_tarval(r);
- tv = tarval_neg(tv);
- goto ptr_arith;
- }
- return res;
-} /* rec_get_accessed_path */
-
-/**
- * Returns an access path or NULL. The access path is only
- * valid, if the graph is in phase_high and _no_ address computation is used.
- */
-static compound_graph_path *get_accessed_path(ir_node *ptr)
-{
- compound_graph_path *gr = rec_get_accessed_path(ptr, 0);
- return gr;
-} /* get_accessed_path */
-