[PATCH] Do not gather mem stats in run_exit_handles (PR middle-end/69919)

[Martin Liška]

Hello.

As discussed in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69919#c3, 
following patch
guards usage of memory statistics infrastructure after a mem_alloc_description 
is already
destructed.

Patch can lto-bootstrap on x86_64-linux-gnu with 
--enable-gather-detailed-mem-stats and
survives bootstrap&regtests with --enable-gather-detailed-mem-stats on 
x86_64-linux-gnu with.

Ready to be installed?
Martin

gcc/ChangeLog:

2016-02-25  Martin Liska  <mli...@suse.cz>

        PR middle-end/69919
        * alloc-pool.c (after_memory_report): New variable.
        * alloc-pool.h (base_pool_allocator ::release): Do not use
        the infrastructure if after_memory_report.
        * toplev.c (toplev::main): Mark after memory report.
---
 gcc/alloc-pool.c | 1 +
 gcc/alloc-pool.h | 5 ++++-
 gcc/toplev.c     | 3 +++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/gcc/alloc-pool.c b/gcc/alloc-pool.c
index ae5e232..43d06f6 100644
--- a/gcc/alloc-pool.c
+++ b/gcc/alloc-pool.c
@@ -25,6 +25,7 @@ along with GCC; see the file COPYING3.  If not see
 
 ALLOC_POOL_ID_TYPE last_id;
 mem_alloc_description<pool_usage> pool_allocator_usage;
+bool after_memory_report = false;
 
 /* Output per-alloc_pool memory usage statistics.  */
 void
diff --git a/gcc/alloc-pool.h b/gcc/alloc-pool.h
index 8ccf089..3ead101 100644
--- a/gcc/alloc-pool.h
+++ b/gcc/alloc-pool.h
@@ -25,6 +25,9 @@ along with GCC; see the file COPYING3.  If not see
 
 extern void dump_alloc_pool_statistics (void);
 
+/* Flag indicates whether memory statistics are gathered any longer.  */
+extern bool after_memory_report;
+
 typedef unsigned long ALLOC_POOL_ID_TYPE;
 
 /* Last used ID.  */
@@ -306,7 +309,7 @@ base_pool_allocator <TBlockAllocator>::release ()
       TBlockAllocator::release (block);
     }
 
-  if (GATHER_STATISTICS)
+  if (GATHER_STATISTICS && !after_memory_report)
     {
       pool_allocator_usage.release_instance_overhead
        (this, (m_elts_allocated - m_elts_free) * m_elt_size);
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 28c115d..c480bfc 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -2107,6 +2107,9 @@ toplev::main (int argc, char **argv)
 
   finalize_plugins ();
   location_adhoc_data_fini (line_table);
+
+  after_memory_report = true;
+
   if (seen_error () || werrorcount)
     return (FATAL_EXIT_CODE);
 
-- 
2.7.0