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Bug 862657 - Make PodCopy work even when copying to a volatile address, and add PodArrayCopy for copying one fixed-size array into another array of the same size. r=froydnj

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--HG--
extra : rebase_source : 7bb59639b95ec7a05272ab0215bbc04a210c11d5
This commit is contained in:
Jeff Walden 2013-05-06 11:05:52 -07:00
parent 14652f99f2
commit 71843eae7c
1 changed files with 31 additions and 0 deletions
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31
mfbt/PodOperations.h
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@ -101,6 +101,37 @@ PodCopy(T* dst, const T* src, size_t nelem)
}
}
template<typename T>
MOZ_ALWAYS_INLINE static void
PodCopy(volatile T* dst, const volatile T* src, size_t nelem)
{
MOZ_ASSERT(dst != src);
MOZ_ASSERT_IF(src < dst,
PointerRangeSize(src, static_cast<const volatile T*>(dst)) >= nelem);
MOZ_ASSERT_IF(dst < src,
PointerRangeSize(static_cast<const volatile T*>(dst), src) >= nelem);
/*
* Volatile |dst| requires extra work, because it's undefined behavior to
* modify volatile objects using the mem* functions. Just write out the
* loops manually, using operator= rather than memcpy for the same reason,
* and let the compiler optimize to the extent it can.
*/
for (const volatile T* srcend = src + nelem; src < srcend; src++, dst++)
*dst = *src;
}
/*
* Copy the contents of the array |src| into the array |dst|, both of size N.
* The arrays must not overlap!
*/
template <class T, size_t N>
static void
PodArrayCopy(T (&dst)[N], const T (&src)[N])
{
PodCopy(dst, src, N);
}
/**
* Determine whether the |len| elements at |one| are memory-identical to the
* |len| elements at |two|.