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Avoid zero-sized allocations when copying a fresh DenseMap.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-03-05 22:00:28 +00:00
parent 7cefa640de
commit 88b0c6a59a
1 changed files with 11 additions and 5 deletions
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16
include/llvm/ADT/DenseMap.h
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@ -255,19 +255,25 @@ private:
#endif #endif
operator delete(Buckets); operator delete(Buckets);
} }
Buckets = static_cast<BucketT*>(operator new(sizeof(BucketT) *
other.NumBuckets)); NumBuckets = other.NumBuckets;
if (NumBuckets == 0) {
Buckets = 0;
return;
}
Buckets = static_cast<BucketT*>(operator new(sizeof(BucketT) * NumBuckets));
if (isPodLike<KeyInfoT>::value && isPodLike<ValueInfoT>::value) if (isPodLike<KeyInfoT>::value && isPodLike<ValueInfoT>::value)
memcpy(Buckets, other.Buckets, other.NumBuckets * sizeof(BucketT)); memcpy(Buckets, other.Buckets, NumBuckets * sizeof(BucketT));
else else
for (size_t i = 0; i < other.NumBuckets; ++i) { for (size_t i = 0; i < NumBuckets; ++i) {
new (&Buckets[i].first) KeyT(other.Buckets[i].first); new (&Buckets[i].first) KeyT(other.Buckets[i].first);
if (!KeyInfoT::isEqual(Buckets[i].first, getEmptyKey()) && if (!KeyInfoT::isEqual(Buckets[i].first, getEmptyKey()) &&
!KeyInfoT::isEqual(Buckets[i].first, getTombstoneKey())) !KeyInfoT::isEqual(Buckets[i].first, getTombstoneKey()))
new (&Buckets[i].second) ValueT(other.Buckets[i].second); new (&Buckets[i].second) ValueT(other.Buckets[i].second);
} }
NumBuckets = other.NumBuckets;
} }
BucketT *InsertIntoBucket(const KeyT &Key, const ValueT &Value, BucketT *InsertIntoBucket(const KeyT &Key, const ValueT &Value,