Patchwork Fix vector C++11 allocator bug

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Submitter François Dumont
Date March 9, 2013, 10:12 a.m.
Message ID <513B0AF8.6000102@gmail.com>
Download mbox | patch
Permalink /patch/226326/
State New
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Comments

François Dumont - March 9, 2013, 10:12 a.m.
On 03/08/2013 10:26 PM, Jonathan Wakely wrote:
> On 8 March 2013 20:16, François Dumont wrote:
>> This is indeed better so I applied the patch as you proposed.
> Thanks, can you also make the same changes to the 4.7 branch? If not I
> can do so.

Attached patch tested under Linux x86_64 and applied to 4.7 branch.

2013-03-09  François Dumont  <fdumont@gcc.gnu.org>

     * include/bits/vector.tcc (vector<>operator=(const vector<>&):
     Reset pointers after deallocation when memory can be reused.
     * testsuite/23_containers/vector/allocator/minimal.cc: Insert
     elements to really challenge C++11 allocator integration.
     * testsuite/23_containers/vector/allocator/copy.cc: Likewise.
     * testsuite/23_containers/vector/allocator/copy_assign.cc:
     Likewise.
     * testsuite/23_containers/vector/allocator/move_assign.cc:
     Likewise.
     * testsuite/23_containers/vector/allocator/swap.cc: Likewise and
     swap vector back before checks on memory/personality mapping are
     performed.

Patch

Index: include/bits/vector.tcc
===================================================================
--- include/bits/vector.tcc	(revision 196569)
+++ include/bits/vector.tcc	(working copy)
@@ -174,6 +174,9 @@ 
 		  _M_deallocate(this->_M_impl._M_start,
 				this->_M_impl._M_end_of_storage
 				- this->_M_impl._M_start);
+		  this->_M_impl._M_start = nullptr;
+		  this->_M_impl._M_finish = nullptr;
+		  this->_M_impl._M_end_of_storage = nullptr;
 		}
 	      std::__alloc_on_copy(_M_get_Tp_allocator(),
 				   __x._M_get_Tp_allocator());
Index: testsuite/23_containers/vector/allocator/copy.cc
===================================================================
--- testsuite/23_containers/vector/allocator/copy.cc	(revision 196569)
+++ testsuite/23_containers/vector/allocator/copy.cc	(working copy)
@@ -31,6 +31,7 @@ 
   typedef propagating_allocator<T, false> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(v1);
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(0 == v2.get_allocator().get_personality());
@@ -42,6 +43,7 @@ 
   typedef propagating_allocator<T, true> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(v1);
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(1 == v2.get_allocator().get_personality());
Index: testsuite/23_containers/vector/allocator/move_assign.cc
===================================================================
--- testsuite/23_containers/vector/allocator/move_assign.cc	(revision 196569)
+++ testsuite/23_containers/vector/allocator/move_assign.cc	(working copy)
@@ -31,7 +31,9 @@ 
   typedef propagating_allocator<T, false> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(alloc_type(2));
+  v2.push_back(T());
   v2 = std::move(v1);
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(2 == v2.get_allocator().get_personality());
@@ -43,8 +45,10 @@ 
   typedef propagating_allocator<T, true> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(alloc_type(2));
   v2 = std::move(v1);
+  v2.push_back(T());
   VERIFY(0 == v1.get_allocator().get_personality());
   VERIFY(1 == v2.get_allocator().get_personality());
 }
Index: testsuite/23_containers/vector/allocator/swap.cc
===================================================================
--- testsuite/23_containers/vector/allocator/swap.cc	(revision 196569)
+++ testsuite/23_containers/vector/allocator/swap.cc	(working copy)
@@ -31,10 +31,14 @@ 
   typedef propagating_allocator<T, false> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(alloc_type(2));
+  v2.push_back(T());
   std::swap(v1, v2);
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(2 == v2.get_allocator().get_personality());
+  // swap back so assertions in uneq_allocator::deallocate don't fail
+  std::swap(v1, v2);
 }
 
 void test02()
Index: testsuite/23_containers/vector/allocator/copy_assign.cc
===================================================================
--- testsuite/23_containers/vector/allocator/copy_assign.cc	(revision 196569)
+++ testsuite/23_containers/vector/allocator/copy_assign.cc	(working copy)
@@ -31,7 +31,9 @@ 
   typedef propagating_allocator<T, false> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(alloc_type(2));
+  v2.push_back(T());
   v2 = v1;
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(2 == v2.get_allocator().get_personality());
@@ -43,7 +45,9 @@ 
   typedef propagating_allocator<T, true> alloc_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
+  v1.push_back(T());
   test_type v2(alloc_type(2));
+  v2.push_back(T());
   v2 = v1;
   VERIFY(1 == v1.get_allocator().get_personality());
   VERIFY(1 == v2.get_allocator().get_personality());
Index: testsuite/23_containers/vector/allocator/minimal.cc
===================================================================
--- testsuite/23_containers/vector/allocator/minimal.cc	(revision 196569)
+++ testsuite/23_containers/vector/allocator/minimal.cc	(working copy)
@@ -35,6 +35,7 @@ 
   typedef std::allocator_traits<alloc_type> traits_type;
   typedef std::vector<T, alloc_type> test_type;
   test_type v(alloc_type{});
+  v.push_back(T());
   VERIFY( v.max_size() == traits_type::max_size(v.get_allocator()) );
 }