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bpo-27987: align PyGC_Head to alignof(long double) (GH-13335)

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Inada Naoki 2019-05-25 21:13:33 +09:00 • committed by GitHub
parent c70ab1cca0
commit ea2b76bdc5
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2 changed files with 7 additions and 1 deletions
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6
Include/objimpl.h
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@ -255,7 +255,11 @@ typedef union _gc_head {
union _gc_head *gc_prev;
Py_ssize_t gc_refs;
} gc;
double dummy; /* force worst-case alignment */
long double dummy; /* force worst-case alignment */
// malloc returns memory block aligned for any built-in types and
// long double is the largest standard C type.
// On amd64 linux, long double requires 16 byte alignment.
// See bpo-27987 for more discussion.
} PyGC_Head;
extern PyGC_Head *_PyGC_generation0;

2
Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst Normal file
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@ -0,0 +1,2 @@
``PyGC_Head`` structure is aligned to ``long double``. This is needed to
GC-ed objects are aligned properly. Patch by Inada Naoki.