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Add a clear() method to FoldingSet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55210 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -143,6 +143,9 @@ public:
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void SetNextInBucket(void *N) { NextInFoldingSetBucket = N; }
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};
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/// clear - Remove all nodes from the folding set.
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void clear();
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/// RemoveNode - Remove a node from the folding set, returning true if one
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/// was removed or false if the node was not in the folding set.
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bool RemoveNode(Node *N);
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@ -200,19 +200,26 @@ static void **GetBucketFor(const FoldingSetNodeID &ID,
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//===----------------------------------------------------------------------===//
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// FoldingSetImpl Implementation
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FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) : NumNodes(0) {
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FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) {
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assert(5 < Log2InitSize && Log2InitSize < 32 &&
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"Initial hash table size out of range");
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NumBuckets = 1 << Log2InitSize;
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Buckets = new void*[NumBuckets+1];
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memset(Buckets, 0, NumBuckets*sizeof(void*));
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// Set the very last bucket to be a non-null "pointer".
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Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
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clear();
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}
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FoldingSetImpl::~FoldingSetImpl() {
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delete [] Buckets;
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}
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void FoldingSetImpl::clear() {
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// Set all but the last bucket to null pointers.
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memset(Buckets, 0, NumBuckets*sizeof(void*));
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// Set the very last bucket to be a non-null "pointer".
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Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
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// Reset the node count to zero.
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NumNodes = 0;
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}
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/// GrowHashTable - Double the size of the hash table and rehash everything.
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///
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@ -221,15 +228,9 @@ void FoldingSetImpl::GrowHashTable() {
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unsigned OldNumBuckets = NumBuckets;
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NumBuckets <<= 1;
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// Reset the node count to zero: we're going to reinsert everything.
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NumNodes = 0;
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// Clear out new buckets.
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Buckets = new void*[NumBuckets+1];
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memset(Buckets, 0, NumBuckets*sizeof(void*));
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// Set the very last bucket to be a non-null "pointer".
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Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
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clear();
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// Walk the old buckets, rehashing nodes into their new place.
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FoldingSetNodeID ID;
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