[Mesa-dev] [PATCH] i965/cfg: Fix cfg_t::dump() when a block has no immediate dominator.

[Kenneth Graunke]

Switch statements introduce a bogus loop with an unconditional break at
the end of the loop, just before the while...so the while is unreachable
and has no immediate dominator.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_cfg.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_cfg.cpp b/src/mesa/drivers/dri/i965/brw_cfg.cpp
index 91d53ef..97e0624 100644
--- a/src/mesa/drivers/dri/i965/brw_cfg.cpp
+++ b/src/mesa/drivers/dri/i965/brw_cfg.cpp
@@ -422,7 +422,11 @@ cfg_t::dump(backend_shader *s)
       calculate_idom();
 
    foreach_block (block, this) {
-      fprintf(stderr, "START B%d IDOM(B%d)", block->num, block->idom->num);
+      if (block->idom)
+         fprintf(stderr, "START B%d IDOM(B%d)", block->num, block->idom->num);
+      else
+         fprintf(stderr, "START B%d IDOM(NONE?!)", block->num);
+
       foreach_list_typed(bblock_link, link, link, &block->parents) {
          fprintf(stderr, " <-B%d",
                  link->block->num);
-- 
2.5.3