//===----------------------------------------------------------------------===//
//
// This file implements a hash set that can be used to remove duplication of
-// nodes in a graph. This code was originally created by Chris Lattner for use
-// with SelectionDAGCSEMap, but was isolated to provide use across the llvm code
-// set.
+// nodes in a graph.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Hashing.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Host.h"
+#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <cstring>
using namespace llvm;
return memcmp(Data, RHS.Data, Size*sizeof(*Data)) == 0;
}
+/// Used to compare the "ordering" of two nodes as defined by the
+/// profiled bits and their ordering defined by memcmp().
+bool FoldingSetNodeIDRef::operator<(FoldingSetNodeIDRef RHS) const {
+ if (Size != RHS.Size)
+ return Size < RHS.Size;
+ return memcmp(Data, RHS.Data, Size*sizeof(*Data)) < 0;
+}
+
//===----------------------------------------------------------------------===//
// FoldingSetNodeID Implementation
///
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
+ // depend on the host. It doesn't matter, however, because hashing on
+ // pointer values is inherently unstable. Nothing should depend on the
// ordering of nodes in the folding set.
Bits.append(reinterpret_cast<unsigned *>(&Ptr),
reinterpret_cast<unsigned *>(&Ptr+1));
// Otherwise do it the hard way.
// To be compatible with above bulk transfer, we need to take endianness
// into account.
- if (sys::isBigEndianHost()) {
+ static_assert(sys::IsBigEndianHost || sys::IsLittleEndianHost,
+ "Unexpected host endianness");
+ if (sys::IsBigEndianHost) {
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 - 1];
Bits.push_back(V);
}
- } else {
- assert(sys::isLittleEndianHost() && "Unexpected host endianness");
+ } else { // Little-endian host
for (Pos += 4; Pos <= Size; Pos += 4) {
unsigned V = ((unsigned char)String[Pos - 1] << 24) |
((unsigned char)String[Pos - 2] << 16) |
/// operator== - Used to compare two nodes to each other.
///
-bool FoldingSetNodeID::operator==(const FoldingSetNodeID &RHS)const{
+bool FoldingSetNodeID::operator==(const FoldingSetNodeID &RHS) const {
return *this == FoldingSetNodeIDRef(RHS.Bits.data(), RHS.Bits.size());
}
return FoldingSetNodeIDRef(Bits.data(), Bits.size()) == RHS;
}
+/// Used to compare the "ordering" of two nodes as defined by the
+/// profiled bits and their ordering defined by memcmp().
+bool FoldingSetNodeID::operator<(const FoldingSetNodeID &RHS) const {
+ return *this < FoldingSetNodeIDRef(RHS.Bits.data(), RHS.Bits.size());
+}
+
+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.
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 nullptr;
return static_cast<FoldingSetImpl::Node*>(NextInBucketPtr);
}
//===----------------------------------------------------------------------===//
// FoldingSetImpl Implementation
+void FoldingSetImpl::anchor() {}
+
FoldingSetImpl::FoldingSetImpl(unsigned Log2InitSize) {
assert(5 < Log2InitSize && Log2InitSize < 32 &&
"Initial hash table size out of range");
Buckets = AllocateBuckets(NumBuckets);
NumNodes = 0;
}
+
+FoldingSetImpl::FoldingSetImpl(FoldingSetImpl &&Arg)
+ : Buckets(Arg.Buckets), NumBuckets(Arg.NumBuckets), NumNodes(Arg.NumNodes) {
+ Arg.Buckets = nullptr;
+ Arg.NumBuckets = 0;
+ Arg.NumNodes = 0;
+}
+
+FoldingSetImpl &FoldingSetImpl::operator=(FoldingSetImpl &&RHS) {
+ free(Buckets); // This may be null if the set is in a moved-from state.
+ Buckets = RHS.Buckets;
+ NumBuckets = RHS.NumBuckets;
+ NumNodes = RHS.NumNodes;
+ RHS.Buckets = nullptr;
+ RHS.NumBuckets = 0;
+ RHS.NumNodes = 0;
+ return *this;
+}
+
FoldingSetImpl::~FoldingSetImpl() {
free(Buckets);
}
+
void FoldingSetImpl::clear() {
// Set all but the last bucket to null pointers.
memset(Buckets, 0, NumBuckets*sizeof(void*));
while (Node *NodeInBucket = GetNextPtr(Probe)) {
// Figure out the next link, remove NodeInBucket from the old link.
Probe = NodeInBucket->getNextInBucket();
- NodeInBucket->SetNextInBucket(0);
+ NodeInBucket->SetNextInBucket(nullptr);
// Insert the node into the new bucket, after recomputing the hash.
InsertNode(NodeInBucket,
FoldingSetImpl::Node
*FoldingSetImpl::FindNodeOrInsertPos(const FoldingSetNodeID &ID,
void *&InsertPos) {
-
- void **Bucket = GetBucketFor(ID.ComputeHash(), Buckets, NumBuckets);
+ unsigned IDHash = ID.ComputeHash();
+ void **Bucket = GetBucketFor(IDHash, Buckets, NumBuckets);
void *Probe = *Bucket;
- InsertPos = 0;
+ InsertPos = nullptr;
FoldingSetNodeID TempID;
while (Node *NodeInBucket = GetNextPtr(Probe)) {
- if (NodeEquals(NodeInBucket, ID, TempID))
+ if (NodeEquals(NodeInBucket, ID, IDHash, TempID))
return NodeInBucket;
TempID.clear();
// Didn't find the node, return null with the bucket as the InsertPos.
InsertPos = Bucket;
- return 0;
+ return nullptr;
}
/// InsertNode - Insert the specified node into the folding set, knowing that it
/// is not already in the map. InsertPos must be obtained from
/// FindNodeOrInsertPos.
void FoldingSetImpl::InsertNode(Node *N, void *InsertPos) {
- assert(N->getNextInBucket() == 0);
+ assert(!N->getNextInBucket());
// Do we need to grow the hashtable?
if (NumNodes+1 > NumBuckets*2) {
GrowHashTable();
// If this is the first insertion into this bucket, its next pointer will be
// 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)
+ if (!Next)
Next = reinterpret_cast<void*>(reinterpret_cast<intptr_t>(Bucket)|1);
// Set the node's next pointer, and make the bucket point to the node.
// Because each bucket is a circular list, we don't need to compute N's hash
// to remove it.
void *Ptr = N->getNextInBucket();
- if (Ptr == 0) return false; // Not in folding set.
+ if (!Ptr) return false; // Not in folding set.
--NumNodes;
- N->SetNextInBucket(0);
+ N->SetNextInBucket(nullptr);
// Remember what N originally pointed to, either a bucket or another node.
void *NodeNextPtr = Ptr;
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 || !GetNextPtr(*Bucket)))
++Bucket;
NodePtr = static_cast<FoldingSetNode*>(*Bucket);
do {
++Bucket;
} while (*Bucket != reinterpret_cast<void*>(-1) &&
- (*Bucket == 0 || GetNextPtr(*Bucket) == 0));
+ (!*Bucket || !GetNextPtr(*Bucket)));
NodePtr = static_cast<FoldingSetNode*>(*Bucket);
}
// FoldingSetBucketIteratorImpl Implementation
FoldingSetBucketIteratorImpl::FoldingSetBucketIteratorImpl(void **Bucket) {
- Ptr = (*Bucket == 0 || GetNextPtr(*Bucket) == 0) ? (void*) Bucket : *Bucket;
+ Ptr = (!*Bucket || !GetNextPtr(*Bucket)) ? (void*) Bucket : *Bucket;
}
projects / oota-llvm.git / blobdiff