#include "irdom_t.h"
#include "irgraph_t.h" /* To access state field. */
#include "irnode_t.h"
+#include "ircons_t.h"
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
/** Accessing the dominator data structures **/
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
ir_node *get_Block_idom(ir_node *bl) {
assert(get_irn_op(bl) == op_Block);
+ if (get_Block_dom_depth(bl) == -1) {
+ /* This block is not reachable from Start */
+ return new_Bad();
+ }
return bl->attr.block.dom.idom;
}
-/**********************************************************************/
-/** Building and Removing the dominator datasturcture **/
-/** **/
-/** **/
-/** **/
-/** **/
-/** **/
-/** **/
-/** **/
-/** .**/
-/** **/
-/** **/
-/** **/
-/** **/
-/** **/
-/** **/
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
+/* Building and Removing the dominator datastructure */
+/*--------------------------------------------------------------------*/
static void count_and_init_blocks(ir_node *bl, void *env) {
int *n_blocks = (int *) env;
/* Step 2 */
irn_arity = get_irn_arity(w->block);
for (j = 0; j < irn_arity; j++) {
- ir_node *pred = get_nodes_block(get_Block_cfgpred(w->block, j));
+ ir_node *cf_op = get_Block_cfgpred(w->block, j);
+ ir_node *pred = get_nodes_block(cf_op);
tmp_dom_info *u;
- if ((is_Bad(get_Block_cfgpred(w->block, j))) ||
+ if ((is_Bad(cf_op)) || (is_Bad(pred)) ||
(get_Block_pre_num (pred) == -1))
continue; /* control-dead */
# include "irnode.h"
-/* Accessing the dominator datastructure.
+/** Accessing the dominator datastructure.
*
* These routines only work properly if the ir_graph is in state
* dom_consistent or dom_inconsistent.
+ *
+ * If the block is not reachable from Start, returns a Bad node.
*/
ir_node *get_Block_idom(ir_node *bl);
void set_Block_idom(ir_node *bl, ir_node *n);