//===----------------------------------------------------------------------===//
#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <cstring>
using namespace llvm;
+//===----------------------------------------------------------------------===//
+// FoldingSetNodeIDRef Implementation
+
+/// ComputeHash - Compute a strong hash value for this FoldingSetNodeIDRef,
+/// used to lookup the node in the FoldingSetImpl.
+unsigned FoldingSetNodeIDRef::ComputeHash() const {
+ // This is adapted from SuperFastHash by Paul Hsieh.
+ unsigned Hash = static_cast<unsigned>(Size);
+ for (const unsigned *BP = Data, *E = BP+Size; BP != E; ++BP) {
+ unsigned Data = *BP;
+ Hash += Data & 0xFFFF;
+ unsigned Tmp = ((Data >> 16) << 11) ^ Hash;
+ Hash = (Hash << 16) ^ Tmp;
+ Hash += Hash >> 11;
+ }
+
+ // Force "avalanching" of final 127 bits.
+ Hash ^= Hash << 3;
+ Hash += Hash >> 5;
+ Hash ^= Hash << 4;
+ Hash += Hash >> 17;
+ Hash ^= Hash << 25;
+ Hash += Hash >> 6;
+ return Hash;
+}
+
+bool FoldingSetNodeIDRef::operator==(FoldingSetNodeIDRef RHS) const {
+ if (Size != RHS.Size) return false;
+ return memcmp(Data, RHS.Data, Size*sizeof(*Data)) == 0;
+}
+
//===----------------------------------------------------------------------===//
// FoldingSetNodeID Implementation
else if (sizeof(long) == sizeof(long long)) {
AddInteger((unsigned long long)I);
} else {
- assert(0 && "unexpected sizeof(long)");
+ llvm_unreachable("unexpected sizeof(long)");
}
}
void FoldingSetNodeID::AddInteger(long long I) {
Bits.push_back(unsigned(I >> 32));
}
-void FoldingSetNodeID::AddString(const char *String, const char *End) {
- unsigned Size = static_cast<unsigned>(End - String);
+void FoldingSetNodeID::AddString(StringRef String) {
+ unsigned Size = String.size();
Bits.push_back(Size);
if (!Size) return;
unsigned Units = Size / 4;
unsigned Pos = 0;
- const unsigned *Base = (const unsigned *)String;
+ const unsigned *Base = (const unsigned*) String.data();
// If the string is aligned do a bulk transfer.
if (!((intptr_t)Base & 3)) {
Bits.push_back(V);
}
-void FoldingSetNodeID::AddString(const char *String) {
- AddString(String, String + strlen(String));
-}
-
-void FoldingSetNodeID::AddString(const std::string &String) {
- AddString(&*String.begin(), &*String.end());
-}
-
/// ComputeHash - Compute a strong hash value for this FoldingSetNodeID, used to
/// lookup the node in the FoldingSetImpl.
unsigned FoldingSetNodeID::ComputeHash() const {
- // This is adapted from SuperFastHash by Paul Hsieh.
- unsigned Hash = static_cast<unsigned>(Bits.size());
- for (const unsigned *BP = &Bits[0], *E = BP+Bits.size(); BP != E; ++BP) {
- unsigned Data = *BP;
- Hash += Data & 0xFFFF;
- unsigned Tmp = ((Data >> 16) << 11) ^ Hash;
- Hash = (Hash << 16) ^ Tmp;
- Hash += Hash >> 11;
- }
-
- // Force "avalanching" of final 127 bits.
- Hash ^= Hash << 3;
- Hash += Hash >> 5;
- Hash ^= Hash << 4;
- Hash += Hash >> 17;
- Hash ^= Hash << 25;
- Hash += Hash >> 6;
- return Hash;
+ return FoldingSetNodeIDRef(Bits.data(), Bits.size()).ComputeHash();
}
/// operator== - Used to compare two nodes to each other.
///
bool FoldingSetNodeID::operator==(const FoldingSetNodeID &RHS)const{
- if (Bits.size() != RHS.Bits.size()) return false;
- return memcmp(&Bits[0], &RHS.Bits[0], Bits.size()*sizeof(Bits[0])) == 0;
+ return *this == FoldingSetNodeIDRef(RHS.Bits.data(), RHS.Bits.size());
}
+/// operator== - Used to compare two nodes to each other.
+///
+bool FoldingSetNodeID::operator==(FoldingSetNodeIDRef RHS) const {
+ return FoldingSetNodeIDRef(Bits.data(), Bits.size()) == RHS;
+}
+
+/// Intern - Copy this node's data to a memory region allocated from the
+/// given allocator and return a FoldingSetNodeIDRef describing the
+/// interned data.
+FoldingSetNodeIDRef
+FoldingSetNodeID::Intern(BumpPtrAllocator &Allocator) const {
+ unsigned *New = Allocator.Allocate<unsigned>(Bits.size());
+ std::uninitialized_copy(Bits.begin(), Bits.end(), New);
+ return FoldingSetNodeIDRef(New, Bits.size());
+}
//===----------------------------------------------------------------------===//
/// Helper functions for FoldingSetImpl.
/// GetBucketFor - Hash the specified node ID and return the hash bucket for
/// the specified ID.
-static void **GetBucketFor(const FoldingSetNodeID &ID,
- void **Buckets, unsigned NumBuckets) {
+static void **GetBucketFor(unsigned Hash, void **Buckets, unsigned NumBuckets) {
// NumBuckets is always a power of 2.
- unsigned BucketNum = ID.ComputeHash() & (NumBuckets-1);
+ unsigned BucketNum = Hash & (NumBuckets-1);
return Buckets + BucketNum;
}
+/// AllocateBuckets - Allocated initialized bucket memory.
+static void **AllocateBuckets(unsigned NumBuckets) {
+ void **Buckets = static_cast<void**>(calloc(NumBuckets+1, sizeof(void*)));
+ // Set the very last bucket to be a non-null "pointer".
+ Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
+ return Buckets;
+}
+
//===----------------------------------------------------------------------===//
// FoldingSetImpl Implementation
assert(5 < Log2InitSize && Log2InitSize < 32 &&
"Initial hash table size out of range");
NumBuckets = 1 << Log2InitSize;
- Buckets = new void*[NumBuckets+1];
- clear();
+ Buckets = AllocateBuckets(NumBuckets);
+ NumNodes = 0;
}
FoldingSetImpl::~FoldingSetImpl() {
- delete [] Buckets;
+ free(Buckets);
}
void FoldingSetImpl::clear() {
// Set all but the last bucket to null pointers.
NumBuckets <<= 1;
// Clear out new buckets.
- Buckets = new void*[NumBuckets+1];
- clear();
+ Buckets = AllocateBuckets(NumBuckets);
+ NumNodes = 0;
// Walk the old buckets, rehashing nodes into their new place.
- FoldingSetNodeID ID;
+ FoldingSetNodeID TempID;
for (unsigned i = 0; i != OldNumBuckets; ++i) {
void *Probe = OldBuckets[i];
if (!Probe) continue;
NodeInBucket->SetNextInBucket(0);
// Insert the node into the new bucket, after recomputing the hash.
- GetNodeProfile(ID, NodeInBucket);
- InsertNode(NodeInBucket, GetBucketFor(ID, Buckets, NumBuckets));
- ID.clear();
+ InsertNode(NodeInBucket,
+ GetBucketFor(ComputeNodeHash(NodeInBucket, TempID),
+ Buckets, NumBuckets));
+ TempID.clear();
}
}
- delete[] OldBuckets;
+ free(OldBuckets);
}
/// FindNodeOrInsertPos - Look up the node specified by ID. If it exists,
*FoldingSetImpl::FindNodeOrInsertPos(const FoldingSetNodeID &ID,
void *&InsertPos) {
- void **Bucket = GetBucketFor(ID, Buckets, NumBuckets);
+ void **Bucket = GetBucketFor(ID.ComputeHash(), Buckets, NumBuckets);
void *Probe = *Bucket;
InsertPos = 0;
- FoldingSetNodeID OtherID;
+ FoldingSetNodeID TempID;
while (Node *NodeInBucket = GetNextPtr(Probe)) {
- GetNodeProfile(OtherID, NodeInBucket);
- if (OtherID == ID)
+ if (NodeEquals(NodeInBucket, ID, TempID))
return NodeInBucket;
+ TempID.clear();
Probe = NodeInBucket->getNextInBucket();
- OtherID.clear();
}
// Didn't find the node, return null with the bucket as the InsertPos.
// Do we need to grow the hashtable?
if (NumNodes+1 > NumBuckets*2) {
GrowHashTable();
- FoldingSetNodeID ID;
- GetNodeProfile(ID, N);
- InsertPos = GetBucketFor(ID, Buckets, NumBuckets);
+ FoldingSetNodeID TempID;
+ InsertPos = GetBucketFor(ComputeNodeHash(N, TempID), Buckets, NumBuckets);
}
++NumNodes;
/// instead.
FoldingSetImpl::Node *FoldingSetImpl::GetOrInsertNode(FoldingSetImpl::Node *N) {
FoldingSetNodeID ID;
- GetNodeProfile(ID, N);
+ GetNodeProfile(N, ID);
void *IP;
if (Node *E = FindNodeOrInsertPos(ID, IP))
return E;