//
// The LLVM Compiler Infrastructure
//
-// This file was developed by James M. Laskey and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
+#include <cstring>
using namespace llvm;
//===----------------------------------------------------------------------===//
-// FoldingSetImpl::NodeID Implementation
+// FoldingSetNodeID Implementation
/// Add* - Add various data types to Bit data.
///
-void FoldingSetImpl::NodeID::AddPointer(const void *Ptr) {
+void FoldingSetNodeID::AddPointer(const void *Ptr) {
// Note: this adds pointers to the hash using sizes and endianness that
// depend on the host. It doesn't matter however, because hashing on
// pointer values in inherently unstable. Nothing should depend on the
if (sizeof(intptr_t) > sizeof(unsigned))
Bits.push_back(unsigned(uint64_t(PtrI) >> 32));
}
-void FoldingSetImpl::NodeID::AddInteger(signed I) {
+void FoldingSetNodeID::AddInteger(signed I) {
Bits.push_back(I);
}
-void FoldingSetImpl::NodeID::AddInteger(unsigned I) {
+void FoldingSetNodeID::AddInteger(unsigned I) {
Bits.push_back(I);
}
-void FoldingSetImpl::NodeID::AddInteger(uint64_t I) {
- Bits.push_back(unsigned(I));
- Bits.push_back(unsigned(I >> 32));
+void FoldingSetNodeID::AddInteger(long I) {
+ AddInteger((unsigned long)I);
}
-void FoldingSetImpl::NodeID::AddFloat(float F) {
- Bits.push_back(FloatToBits(F));
+void FoldingSetNodeID::AddInteger(unsigned long I) {
+ if (sizeof(long) == sizeof(int))
+ AddInteger(unsigned(I));
+ else if (sizeof(long) == sizeof(long long)) {
+ AddInteger((unsigned long long)I);
+ } else {
+ llvm_unreachable("unexpected sizeof(long)");
+ }
+}
+void FoldingSetNodeID::AddInteger(long long I) {
+ AddInteger((unsigned long long)I);
}
-void FoldingSetImpl::NodeID::AddDouble(double D) {
- AddInteger(DoubleToBits(D));
+void FoldingSetNodeID::AddInteger(unsigned long long I) {
+ AddInteger(unsigned(I));
+ if ((uint64_t)(int)I != I)
+ Bits.push_back(unsigned(I >> 32));
}
-void FoldingSetImpl::NodeID::AddString(const std::string &String) {
- unsigned Size = String.size();
+
+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.data();
+ const unsigned *Base = (const unsigned*) String.data();
// If the string is aligned do a bulk transfer.
if (!((intptr_t)Base & 3)) {
Pos = (Units + 1) * 4;
} else {
// Otherwise do it the hard way.
- for ( Pos += 4; Pos <= Size; Pos += 4) {
+ for (Pos += 4; Pos <= Size; Pos += 4) {
unsigned V = ((unsigned char)String[Pos - 4] << 24) |
((unsigned char)String[Pos - 3] << 16) |
((unsigned char)String[Pos - 2] << 8) |
Bits.push_back(V);
}
-/// ComputeHash - Compute a strong hash value for this NodeID, used to
+/// ComputeHash - Compute a strong hash value for this FoldingSetNodeID, used to
/// lookup the node in the FoldingSetImpl.
-unsigned FoldingSetImpl::NodeID::ComputeHash() const {
+unsigned FoldingSetNodeID::ComputeHash() const {
// This is adapted from SuperFastHash by Paul Hsieh.
- unsigned Hash = Bits.size();
+ 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;
/// operator== - Used to compare two nodes to each other.
///
-bool FoldingSetImpl::NodeID::operator==(const FoldingSetImpl::NodeID &RHS)const{
+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;
}
/// The problem with this is that the start of the hash buckets are not
/// Nodes. If NextInBucketPtr is a bucket pointer, this method returns null:
/// use GetBucketPtr when this happens.
-static FoldingSetImpl::Node *GetNextPtr(void *NextInBucketPtr,
- void **Buckets, unsigned NumBuckets) {
- if (NextInBucketPtr >= Buckets && NextInBucketPtr < Buckets + NumBuckets)
+static FoldingSetImpl::Node *GetNextPtr(void *NextInBucketPtr) {
+ // The low bit is set if this is the pointer back to the bucket.
+ if (reinterpret_cast<intptr_t>(NextInBucketPtr) & 1)
return 0;
+
return static_cast<FoldingSetImpl::Node*>(NextInBucketPtr);
}
-/// GetBucketPtr - Provides a casting of a bucket pointer for isNode
+
/// testing.
static void **GetBucketPtr(void *NextInBucketPtr) {
- return static_cast<void**>(NextInBucketPtr);
+ intptr_t Ptr = reinterpret_cast<intptr_t>(NextInBucketPtr);
+ assert((Ptr & 1) && "Not a bucket pointer");
+ return reinterpret_cast<void**>(Ptr & ~intptr_t(1));
}
/// GetBucketFor - Hash the specified node ID and return the hash bucket for
/// the specified ID.
-static void **GetBucketFor(const FoldingSetImpl::NodeID &ID,
+static void **GetBucketFor(const FoldingSetNodeID &ID,
void **Buckets, unsigned NumBuckets) {
// NumBuckets is always a power of 2.
unsigned BucketNum = ID.ComputeHash() & (NumBuckets-1);
//===----------------------------------------------------------------------===//
// FoldingSetImpl Implementation
-FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) : NumNodes(0) {
+FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) {
assert(5 < Log2InitSize && Log2InitSize < 32 &&
"Initial hash table size out of range");
NumBuckets = 1 << Log2InitSize;
- Buckets = new void*[NumBuckets];
- memset(Buckets, 0, NumBuckets*sizeof(void*));
+ Buckets = new void*[NumBuckets+1];
+ clear();
}
FoldingSetImpl::~FoldingSetImpl() {
delete [] Buckets;
}
+void FoldingSetImpl::clear() {
+ // Set all but the last bucket to null pointers.
+ memset(Buckets, 0, NumBuckets*sizeof(void*));
+
+ // Set the very last bucket to be a non-null "pointer".
+ Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
+
+ // Reset the node count to zero.
+ NumNodes = 0;
+}
/// GrowHashTable - Double the size of the hash table and rehash everything.
///
unsigned OldNumBuckets = NumBuckets;
NumBuckets <<= 1;
- // Reset the node count to zero: we're going to reinsert everything.
- NumNodes = 0;
-
// Clear out new buckets.
- Buckets = new void*[NumBuckets];
- memset(Buckets, 0, NumBuckets*sizeof(void*));
+ Buckets = new void*[NumBuckets+1];
+ clear();
// Walk the old buckets, rehashing nodes into their new place.
+ FoldingSetNodeID ID;
for (unsigned i = 0; i != OldNumBuckets; ++i) {
void *Probe = OldBuckets[i];
if (!Probe) continue;
- while (Node *NodeInBucket = GetNextPtr(Probe, OldBuckets, OldNumBuckets)) {
+ while (Node *NodeInBucket = GetNextPtr(Probe)) {
// Figure out the next link, remove NodeInBucket from the old link.
Probe = NodeInBucket->getNextInBucket();
NodeInBucket->SetNextInBucket(0);
// Insert the node into the new bucket, after recomputing the hash.
- NodeID ID;
GetNodeProfile(ID, NodeInBucket);
InsertNode(NodeInBucket, GetBucketFor(ID, Buckets, NumBuckets));
+ ID.clear();
}
}
/// FindNodeOrInsertPos - Look up the node specified by ID. If it exists,
/// return it. If not, return the insertion token that will make insertion
/// faster.
-FoldingSetImpl::Node *FoldingSetImpl::FindNodeOrInsertPos(const NodeID &ID,
- void *&InsertPos) {
+FoldingSetImpl::Node
+*FoldingSetImpl::FindNodeOrInsertPos(const FoldingSetNodeID &ID,
+ void *&InsertPos) {
+
void **Bucket = GetBucketFor(ID, Buckets, NumBuckets);
void *Probe = *Bucket;
InsertPos = 0;
- while (Node *NodeInBucket = GetNextPtr(Probe, Buckets, NumBuckets)) {
- NodeID OtherID;
+ FoldingSetNodeID OtherID;
+ while (Node *NodeInBucket = GetNextPtr(Probe)) {
GetNodeProfile(OtherID, NodeInBucket);
if (OtherID == ID)
return NodeInBucket;
Probe = NodeInBucket->getNextInBucket();
+ OtherID.clear();
}
// Didn't find the node, return null with the bucket as the InsertPos.
/// is not already in the map. InsertPos must be obtained from
/// FindNodeOrInsertPos.
void FoldingSetImpl::InsertNode(Node *N, void *InsertPos) {
+ assert(N->getNextInBucket() == 0);
// Do we need to grow the hashtable?
if (NumNodes+1 > NumBuckets*2) {
GrowHashTable();
- NodeID ID;
+ FoldingSetNodeID ID;
GetNodeProfile(ID, N);
InsertPos = GetBucketFor(ID, Buckets, NumBuckets);
}
void *Next = *Bucket;
// If this is the first insertion into this bucket, its next pointer will be
- // null. Pretend as if it pointed to itself.
+ // null. Pretend as if it pointed to itself, setting the low bit to indicate
+ // that it is a pointer to the bucket.
if (Next == 0)
- Next = Bucket;
+ Next = reinterpret_cast<void*>(reinterpret_cast<intptr_t>(Bucket)|1);
// Set the node's next pointer, and make the bucket point to the node.
N->SetNextInBucket(Next);
/// removed or false if the node was not in the folding set.
bool FoldingSetImpl::RemoveNode(Node *N) {
// Because each bucket is a circular list, we don't need to compute N's hash
- // to remove it. Chase around the list until we find the node (or bucket)
- // which points to N.
+ // to remove it.
void *Ptr = N->getNextInBucket();
if (Ptr == 0) return false; // Not in folding set.
--NumNodes;
+ N->SetNextInBucket(0);
+ // Remember what N originally pointed to, either a bucket or another node.
void *NodeNextPtr = Ptr;
- N->SetNextInBucket(0);
+
+ // Chase around the list until we find the node (or bucket) which points to N.
while (true) {
- if (Node *NodeInBucket = GetNextPtr(Ptr, Buckets, NumBuckets)) {
+ if (Node *NodeInBucket = GetNextPtr(Ptr)) {
// Advance pointer.
Ptr = NodeInBucket->getNextInBucket();
/// equal to the specified node, return it. Otherwise, insert 'N' and it
/// instead.
FoldingSetImpl::Node *FoldingSetImpl::GetOrInsertNode(FoldingSetImpl::Node *N) {
- NodeID ID;
+ FoldingSetNodeID ID;
GetNodeProfile(ID, N);
void *IP;
if (Node *E = FindNodeOrInsertPos(ID, IP))
InsertNode(N, IP);
return N;
}
+
+//===----------------------------------------------------------------------===//
+// FoldingSetIteratorImpl Implementation
+
+FoldingSetIteratorImpl::FoldingSetIteratorImpl(void **Bucket) {
+ // Skip to the first non-null non-self-cycle bucket.
+ while (*Bucket != reinterpret_cast<void*>(-1) &&
+ (*Bucket == 0 || GetNextPtr(*Bucket) == 0))
+ ++Bucket;
+
+ NodePtr = static_cast<FoldingSetNode*>(*Bucket);
+}
+
+void FoldingSetIteratorImpl::advance() {
+ // If there is another link within this bucket, go to it.
+ void *Probe = NodePtr->getNextInBucket();
+
+ if (FoldingSetNode *NextNodeInBucket = GetNextPtr(Probe))
+ NodePtr = NextNodeInBucket;
+ else {
+ // Otherwise, this is the last link in this bucket.
+ void **Bucket = GetBucketPtr(Probe);
+
+ // Skip to the next non-null non-self-cycle bucket.
+ do {
+ ++Bucket;
+ } while (*Bucket != reinterpret_cast<void*>(-1) &&
+ (*Bucket == 0 || GetNextPtr(*Bucket) == 0));
+
+ NodePtr = static_cast<FoldingSetNode*>(*Bucket);
+ }
+}
+
+//===----------------------------------------------------------------------===//
+// FoldingSetBucketIteratorImpl Implementation
+
+FoldingSetBucketIteratorImpl::FoldingSetBucketIteratorImpl(void **Bucket) {
+ Ptr = (*Bucket == 0 || GetNextPtr(*Bucket) == 0) ? (void*) Bucket : *Bucket;
+}