using namespace llvm;
-void SmallPtrSetImpl::shrink_and_clear() {
+void SmallPtrSetImplBase::shrink_and_clear() {
assert(!isSmall() && "Can't shrink a small set!");
free(CurArray);
memset(CurArray, -1, CurArraySize*sizeof(void*));
}
-bool SmallPtrSetImpl::insert_imp(const void * Ptr) {
+std::pair<const void *const *, bool>
+SmallPtrSetImplBase::insert_imp(const void *Ptr) {
if (isSmall()) {
// Check to see if it is already in the set.
for (const void **APtr = SmallArray, **E = SmallArray+NumElements;
APtr != E; ++APtr)
if (*APtr == Ptr)
- return false;
-
+ return std::make_pair(APtr, false);
+
// Nope, there isn't. If we stay small, just 'pushback' now.
- if (NumElements < CurArraySize-1) {
+ if (NumElements < CurArraySize) {
SmallArray[NumElements++] = Ptr;
- return true;
+ return std::make_pair(SmallArray + (NumElements - 1), true);
}
// Otherwise, hit the big set case, which will call grow.
}
-
- if (NumElements*4 >= CurArraySize*3) {
+
+ if (LLVM_UNLIKELY(NumElements * 4 >= CurArraySize * 3)) {
// If more than 3/4 of the array is full, grow.
Grow(CurArraySize < 64 ? 128 : CurArraySize*2);
- } else if (CurArraySize-(NumElements+NumTombstones) < CurArraySize/8) {
+ } else if (LLVM_UNLIKELY(CurArraySize - (NumElements + NumTombstones) <
+ CurArraySize / 8)) {
// If fewer of 1/8 of the array is empty (meaning that many are filled with
// tombstones), rehash.
Grow(CurArraySize);
// Okay, we know we have space. Find a hash bucket.
const void **Bucket = const_cast<const void**>(FindBucketFor(Ptr));
- if (*Bucket == Ptr) return false; // Already inserted, good.
-
+ if (*Bucket == Ptr)
+ return std::make_pair(Bucket, false); // Already inserted, good.
+
// Otherwise, insert it!
if (*Bucket == getTombstoneMarker())
--NumTombstones;
*Bucket = Ptr;
++NumElements; // Track density.
- return true;
+ return std::make_pair(Bucket, true);
}
-bool SmallPtrSetImpl::erase_imp(const void * Ptr) {
+bool SmallPtrSetImplBase::erase_imp(const void * Ptr) {
if (isSmall()) {
// Check to see if it is in the set.
for (const void **APtr = SmallArray, **E = SmallArray+NumElements;
return true;
}
-const void * const *SmallPtrSetImpl::FindBucketFor(const void *Ptr) const {
+const void * const *SmallPtrSetImplBase::FindBucketFor(const void *Ptr) const {
unsigned Bucket = DenseMapInfo<void *>::getHashValue(Ptr) & (CurArraySize-1);
unsigned ArraySize = CurArraySize;
unsigned ProbeAmt = 1;
const void *const *Array = CurArray;
- const void *const *Tombstone = 0;
+ const void *const *Tombstone = nullptr;
while (1) {
- // Found Ptr's bucket?
- if (Array[Bucket] == Ptr)
- return Array+Bucket;
-
// If we found an empty bucket, the pointer doesn't exist in the set.
// Return a tombstone if we've seen one so far, or the empty bucket if
// not.
- if (Array[Bucket] == getEmptyMarker())
+ if (LLVM_LIKELY(Array[Bucket] == getEmptyMarker()))
return Tombstone ? Tombstone : Array+Bucket;
-
+
+ // Found Ptr's bucket?
+ if (LLVM_LIKELY(Array[Bucket] == Ptr))
+ return Array+Bucket;
+
// If this is a tombstone, remember it. If Ptr ends up not in the set, we
// prefer to return it than something that would require more probing.
if (Array[Bucket] == getTombstoneMarker() && !Tombstone)
/// Grow - Allocate a larger backing store for the buckets and move it over.
///
-void SmallPtrSetImpl::Grow(unsigned NewSize) {
+void SmallPtrSetImplBase::Grow(unsigned NewSize) {
// Allocate at twice as many buckets, but at least 128.
unsigned OldSize = CurArraySize;
}
}
-SmallPtrSetImpl::SmallPtrSetImpl(const void **SmallStorage,
- const SmallPtrSetImpl& that) {
+SmallPtrSetImplBase::SmallPtrSetImplBase(const void **SmallStorage,
+ const SmallPtrSetImplBase& that) {
SmallArray = SmallStorage;
// If we're becoming small, prepare to insert into our stack space
NumTombstones = that.NumTombstones;
}
+SmallPtrSetImplBase::SmallPtrSetImplBase(const void **SmallStorage,
+ unsigned SmallSize,
+ SmallPtrSetImplBase &&that) {
+ SmallArray = SmallStorage;
+
+ // Copy over the basic members.
+ CurArraySize = that.CurArraySize;
+ NumElements = that.NumElements;
+ NumTombstones = that.NumTombstones;
+
+ // When small, just copy into our small buffer.
+ if (that.isSmall()) {
+ CurArray = SmallArray;
+ memcpy(CurArray, that.CurArray, sizeof(void *) * CurArraySize);
+ } else {
+ // Otherwise, we steal the large memory allocation and no copy is needed.
+ CurArray = that.CurArray;
+ that.CurArray = that.SmallArray;
+ }
+
+ // Make the "that" object small and empty.
+ that.CurArraySize = SmallSize;
+ assert(that.CurArray == that.SmallArray);
+ that.NumElements = 0;
+ that.NumTombstones = 0;
+}
+
/// CopyFrom - implement operator= from a smallptrset that has the same pointer
/// type, but may have a different small size.
-void SmallPtrSetImpl::CopyFrom(const SmallPtrSetImpl &RHS) {
+void SmallPtrSetImplBase::CopyFrom(const SmallPtrSetImplBase &RHS) {
+ assert(&RHS != this && "Self-copy should be handled by the caller.");
+
if (isSmall() && RHS.isSmall())
assert(CurArraySize == RHS.CurArraySize &&
"Cannot assign sets with different small sizes");
} else if (CurArraySize != RHS.CurArraySize) {
if (isSmall())
CurArray = (const void**)malloc(sizeof(void*) * RHS.CurArraySize);
- else
- CurArray = (const void**)realloc(CurArray, sizeof(void*)*RHS.CurArraySize);
+ else {
+ const void **T = (const void**)realloc(CurArray,
+ sizeof(void*) * RHS.CurArraySize);
+ if (!T)
+ free(CurArray);
+ CurArray = T;
+ }
assert(CurArray && "Failed to allocate memory?");
}
NumTombstones = RHS.NumTombstones;
}
-void SmallPtrSetImpl::swap(SmallPtrSetImpl &RHS) {
+void SmallPtrSetImplBase::MoveFrom(unsigned SmallSize,
+ SmallPtrSetImplBase &&RHS) {
+ assert(&RHS != this && "Self-move should be handled by the caller.");
+
+ if (!isSmall())
+ free(CurArray);
+
+ if (RHS.isSmall()) {
+ // Copy a small RHS rather than moving.
+ CurArray = SmallArray;
+ memcpy(CurArray, RHS.CurArray, sizeof(void*)*RHS.CurArraySize);
+ } else {
+ CurArray = RHS.CurArray;
+ RHS.CurArray = RHS.SmallArray;
+ }
+
+ // Copy the rest of the trivial members.
+ CurArraySize = RHS.CurArraySize;
+ NumElements = RHS.NumElements;
+ NumTombstones = RHS.NumTombstones;
+
+ // Make the RHS small and empty.
+ RHS.CurArraySize = SmallSize;
+ assert(RHS.CurArray == RHS.SmallArray);
+ RHS.NumElements = 0;
+ RHS.NumTombstones = 0;
+}
+
+void SmallPtrSetImplBase::swap(SmallPtrSetImplBase &RHS) {
if (this == &RHS) return;
// We can only avoid copying elements if neither set is small.
std::swap(this->NumElements, RHS.NumElements);
}
-SmallPtrSetImpl::~SmallPtrSetImpl() {
+SmallPtrSetImplBase::~SmallPtrSetImplBase() {
if (!isSmall())
free(CurArray);
}
projects / oota-llvm.git / blobdiff