Contribution of PowerPC port (continuation of 422063005) - AIX Common1

src/base/atomicops.h

Index: src/base/atomicops.h
diff --git a/src/base/atomicops.h b/src/base/atomicops.h
index d059a019647bb4860fb20618907954687d5167ec..d4c517bf9d619baa18128534766d949c533a0fef 100644
--- a/src/base/atomicops.h
+++ b/src/base/atomicops.h
@@ -56,7 +56,11 @@ typedef intptr_t Atomic64;
 
 // Use AtomicWord for a machine-sized pointer.  It will use the Atomic32 or
 // Atomic64 routines below, depending on your architecture.
+#if V8_OS_AIX && V8_HOST_ARCH_32_BIT
+typedef Atomic32 AtomicWord;

[Sven Panne, 2015/01/27 11:47:05]

Hmmm, why do we need this?

[michael_dawson, 2015/01/29 00:08:29]

It looks like this was to deal with the case mentioned in
src/base/atomicops_internals_atomicword_compat.h. The description in that file
is:

// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
// which in turn means int. On some LP32 platforms, intptr_t is an int, but
// on others, it's a long. When AtomicWord and Atomic32 are based on different
// fundamental types, their pointers are incompatible.
//
// This file defines function overloads to allow both AtomicWord and Atomic32
// data to be used with this interface.


Given that there is an existing solution in
src/base/atomicops_internals_atomicword_compat.h I'll enable that for AIX and
remove the specialization of the typedef for AIX.

+#else
 typedef intptr_t AtomicWord;
+#endif
 
 // Atomically execute:
 //      result = *ptr;