[committed] Add --devel-dump-dups

[Tom de Vries <tdevries@suse.de>]

Hi,

Add an option --devel-dump-dups that prints the duplicate chains:
...
$ dwz min --devel-dump-dups
duplicate chain:
 4a O e00eb67a e00eb67a int base_type
 9c O e00eb67a e00eb67a int base_type
...

Committed to trunk.

Thanks,
- Tom

Add --devel-dump-dups

2019-11-30  Tom de Vries  <tdevries@suse.de>

	* dwz.c (dump_dups): New var.
	(partition_find_dups): Dump duplicate chains if dump_dups.
	(dwz_options): Add --devel-dump-dups.

---
 dwz.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dwz.c b/dwz.c
index e92e9d8..93c8736 100644
--- a/dwz.c
+++ b/dwz.c
@@ -156,11 +156,13 @@ static int tracing;
 static int ignore_size;
 static int ignore_locus;
 static int dump_dies_p;
+static int dump_dups;
 #else
 #define tracing 0
 #define ignore_size 0
 #define ignore_locus 0
 #define dump_dies_p 0
+#define dump_dups 0
 #endif
 static int unoptimized_multifile;
 static int save_temps = 0;
@@ -5929,6 +5931,15 @@ partition_find_dups (struct obstack *vec, dw_die_ref parent)
 	    }
 	  child->die_nextdup = prev;
 	  obstack_ptr_grow (vec, child);
+	  if (dump_dups)
+	    {
+	      fprintf (stderr, "duplicate chain:\n");
+	      {
+		dw_die_ref d;
+		for (d = child; d; d = d->die_nextdup)
+		  dump_die (d);
+	      }
+	    }
 	}
       else if (child->die_named_namespace)
 	partition_find_dups (vec, child);
@@ -13060,6 +13071,7 @@ static struct option dwz_options[] =
   { "devel-ignore-locus",no_argument,	    &ignore_locus, 1 },
   { "devel-save-temps",  no_argument,	    &save_temps, 1 },
   { "devel-dump-dies",  no_argument,	    &dump_dies_p, 1 },
+  { "devel-dump-dups",  no_argument,	    &dump_dups, 1 },
   { "devel-unoptimized-multifile",
 			 no_argument,	    &unoptimized_multifile, 1 },
   { "devel-verify-edges",no_argument,	    &verify_edges_p, 1 },