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41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From e68ff170dc6764b22886e703f583fb53e90367ef Mon Sep 17 00:00:00 2001
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From: Inada Naoki <songofacandy@gmail.com>
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Date: Sat, 25 May 2019 21:13:33 +0900
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Subject: [PATCH 10/10] bpo-27987: align PyGC_Head to alignof(long double)
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(GH-13335)
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---
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Include/objimpl.h | 6 +++++-
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.../2019-05-15-18-28-43.bpo-27987.FaxuLy.rst | 2 ++
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2 files changed, 7 insertions(+), 1 deletion(-)
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create mode 100644 Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst
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diff --git a/Include/objimpl.h b/Include/objimpl.h
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index e7a3696d7a..90d71b87ea 100644
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--- a/Include/objimpl.h
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+++ b/Include/objimpl.h
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@@ -255,7 +255,11 @@ typedef union _gc_head {
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union _gc_head *gc_prev;
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Py_ssize_t gc_refs;
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} gc;
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- double dummy; /* force worst-case alignment */
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+ long double dummy; /* force worst-case alignment */
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+ // malloc returns memory block aligned for any built-in types and
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+ // long double is the largest standard C type.
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+ // On amd64 linux, long double requires 16 byte alignment.
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+ // See bpo-27987 for more discussion.
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} PyGC_Head;
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extern PyGC_Head *_PyGC_generation0;
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diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst b/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst
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new file mode 100644
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index 0000000000..97ca37b262
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst
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@@ -0,0 +1,2 @@
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+``PyGC_Head`` structure is aligned to ``long double``. This is needed to
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+GC-ed objects are aligned properly. Patch by Inada Naoki.
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--
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2.38.4
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