From bf7d986af62e3199cccdd79223ff85d384484add Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Tue, 17 Jul 2012 22:15:42 +0100
Subject: [PATCH] Add static assert that objects on stacks are not too big (bug
 #491).

---
 Eigen/src/Core/DenseStorage.h      | 25 +++++++++++++++++++++----
 Eigen/src/Core/util/StaticAssert.h |  3 ++-
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/Eigen/src/Core/DenseStorage.h b/Eigen/src/Core/DenseStorage.h
index 25fbad1ff..9d34ec934 100644
--- a/Eigen/src/Core/DenseStorage.h
+++ b/Eigen/src/Core/DenseStorage.h
@@ -35,8 +35,16 @@ template <typename T, int Size, int MatrixOrArrayOptions,
 struct plain_array
 {
   T array[Size];
-  plain_array() {}
-  plain_array(constructor_without_unaligned_array_assert) {}
+
+  plain_array() 
+  { 
+    EIGEN_STATIC_ASSERT(Size * sizeof(T) <= 128 * 128 * 8, OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG);
+  }
+
+  plain_array(constructor_without_unaligned_array_assert) 
+  { 
+    EIGEN_STATIC_ASSERT(Size * sizeof(T) <= 128 * 128 * 8, OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG);
+  }
 };
 
 #ifdef EIGEN_DISABLE_UNALIGNED_ARRAY_ASSERT
@@ -53,8 +61,17 @@ template <typename T, int Size, int MatrixOrArrayOptions>
 struct plain_array<T, Size, MatrixOrArrayOptions, 16>
 {
   EIGEN_USER_ALIGN16 T array[Size];
-  plain_array() { EIGEN_MAKE_UNALIGNED_ARRAY_ASSERT(0xf) }
-  plain_array(constructor_without_unaligned_array_assert) {}
+
+  plain_array() 
+  { 
+    EIGEN_MAKE_UNALIGNED_ARRAY_ASSERT(0xf);
+    EIGEN_STATIC_ASSERT(Size * sizeof(T) <= 128 * 128 * 8, OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG);
+  }
+
+  plain_array(constructor_without_unaligned_array_assert) 
+  { 
+    EIGEN_STATIC_ASSERT(Size * sizeof(T) <= 128 * 128 * 8, OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG);
+  }
 };
 
 template <typename T, int MatrixOrArrayOptions, int Alignment>
diff --git a/Eigen/src/Core/util/StaticAssert.h b/Eigen/src/Core/util/StaticAssert.h
index b46a75b37..8872c5b64 100644
--- a/Eigen/src/Core/util/StaticAssert.h
+++ b/Eigen/src/Core/util/StaticAssert.h
@@ -89,7 +89,8 @@
         YOU_PASSED_A_ROW_VECTOR_BUT_A_COLUMN_VECTOR_WAS_EXPECTED,
         YOU_PASSED_A_COLUMN_VECTOR_BUT_A_ROW_VECTOR_WAS_EXPECTED,
         THE_INDEX_TYPE_MUST_BE_A_SIGNED_TYPE,
-        THE_STORAGE_ORDER_OF_BOTH_SIDES_MUST_MATCH
+        THE_STORAGE_ORDER_OF_BOTH_SIDES_MUST_MATCH,
+        OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG
       };
     };