From a16beeae660614fd33028aa94f4c2235539823b3 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Sat, 9 Apr 2011 18:21:20 +0200
Subject: [PATCH] Bail out rather than crashing in array_type_nelts if
 TYPE_MAX_VALUE is null.

From-SVN: r172228
---
 gcc/ChangeLog | 4 ++++
 gcc/tree.c    | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b8d07e93ccf2..fb4d53ff174c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2011-04-09  Duncan Sands  <baldrick@free.fr>
+
+	* tree.c (array_type_nelts): Bail out if TYPE_MAX_VALUE not set.
+
 2011-04-07  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/sse.md (avx_cmps<ssemodesuffixf2c><mode>3): Add
diff --git a/gcc/tree.c b/gcc/tree.c
index 4b1bfac42ae9..7bf2e3e086b4 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -2337,6 +2337,10 @@ array_type_nelts (const_tree type)
   min = TYPE_MIN_VALUE (index_type);
   max = TYPE_MAX_VALUE (index_type);
 
+  /* TYPE_MAX_VALUE may not be set if the array has unknown length.  */
+  if (!max)
+    return error_mark_node;
+
   return (integer_zerop (min)
 	  ? max
 	  : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
-- 
2.47.2