Merge pull request #1202 from undingen/const_generation0

microptimization: mark _PyGC_generation0 as having a const address

Merge pull request #1202 from undingen/const_generation0
microptimization: mark _PyGC_generation0 as having a const address
9ffdeadd · Marius Wachtler · e335b4c0 · 938b0190 · 9ffdeadd · 9ffdeadd
Commit 9ffdeadd authored May 23, 2016 by Marius Wachtler
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from_cpython/Include/objimpl.h from_cpython/Include/objimpl.h +1 -1

from_cpython/Modules/gcmodule.c from_cpython/Modules/gcmodule.c +1 -1

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--- a/from_cpython/Include/objimpl.h
+++ b/from_cpython/Include/objimpl.h
@@ -260,7 +260,7 @@ typedef union _gc_head {
    long double dummy;  /* force worst-case alignment */
 } PyGC_Head;

-extern PyGC_Head *_PyGC_generation0;
+extern PyGC_Head * const _PyGC_generation0;

 #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)


--- a/from_cpython/Modules/gcmodule.c
+++ b/from_cpython/Modules/gcmodule.c
@@ -47,7 +47,7 @@ static struct gc_generation generations[NUM_GENERATIONS] = {
    {{{GEN_HEAD(2), GEN_HEAD(2), 0}},           10,             0},
 };

-PyGC_Head *_PyGC_generation0 = GEN_HEAD(0);
+PyGC_Head * const _PyGC_generation0 = GEN_HEAD(0);

 static int enabled = 1; /* automatic collection enabled? */