/// 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) {
if (isSmall() && RHS.isSmall())
assert(CurArraySize == RHS.CurArraySize &&
"Cannot assign sets with different small sizes");
// If we're becoming small, prepare to insert into our stack space
if (RHS.isSmall()) {
if (!isSmall())
free(CurArray);
CurArray = SmallArray;
// Otherwise, allocate new heap space (unless we were the same size)
} 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);
assert(CurArray && "Failed to allocate memory?");
}
// Copy over the new array size
CurArraySize = RHS.CurArraySize;
// Copy over the contents from the other set
memcpy(CurArray, RHS.CurArray, sizeof(void*)*CurArraySize);
NumElements = RHS.NumElements;
NumTombstones = RHS.NumTombstones;
}
void SmallPtrSetImpl::swap(SmallPtrSetImpl &RHS) {
if (this == &RHS) return;
// We can only avoid copying elements if neither set is small.
if (!this->isSmall() && !RHS.isSmall()) {
std::swap(this->CurArray, RHS.CurArray);
std::swap(this->CurArraySize, RHS.CurArraySize);
std::swap(this->NumElements, RHS.NumElements);
std::swap(this->NumTombstones, RHS.NumTombstones);
return;
}
// FIXME: From here on we assume that both sets have the same small size.
// If only RHS is small, copy the small elements into LHS and move the pointer
// from LHS to RHS.
if (!this->isSmall() && RHS.isSmall()) {
std::copy(RHS.SmallArray, RHS.SmallArray+RHS.CurArraySize,
this->SmallArray);
std::swap(this->NumElements, RHS.NumElements);
std::swap(this->CurArraySize, RHS.CurArraySize);
RHS.CurArray = this->CurArray;
RHS.NumTombstones = this->NumTombstones;
this->CurArray = this->SmallArray;
this->NumTombstones = 0;
return;
}
// If only LHS is small, copy the small elements into RHS and move the pointer
// from RHS to LHS.
if (this->isSmall() && !RHS.isSmall()) {
std::copy(this->SmallArray, this->SmallArray+this->CurArraySize,
RHS.SmallArray);
std::swap(RHS.NumElements, this->NumElements);
std::swap(RHS.CurArraySize, this->CurArraySize);
this->CurArray = RHS.CurArray;
this->NumTombstones = RHS.NumTombstones;
RHS.CurArray = RHS.SmallArray;
RHS.NumTombstones = 0;
return;
}
// Both a small, just swap the small elements.
assert(this->isSmall() && RHS.isSmall());
assert(this->CurArraySize == RHS.CurArraySize);
std::swap_ranges(this->SmallArray, this->SmallArray+this->CurArraySize,
RHS.SmallArray);
std::swap(this->NumElements, RHS.NumElements);
}
SmallPtrSetImpl::SmallPtrSetImpl(const SmallPtrSetImpl& that) {
NumElements = that.NumElements;
NumTombstones = 0;
if (that.isSmall()) {
CurArraySize = that.CurArraySize;
CurArray = &SmallArray[0];
memcpy(CurArray, that.CurArray, sizeof(void*)*CurArraySize);
} else {
CurArraySize = that.NumElements < 64 ? 128 : that.NumElements*2;
CurArray = new void*[CurArraySize+1];
memset(CurArray, -1, CurArraySize*sizeof(void*));
// The end pointer, always valid, is set to a valid element to help the
// iterator.
CurArray[CurArraySize] = 0;
// Copy over all valid entries.
for (void **BucketPtr = that.CurArray, **E = that.CurArray+CurArraySize;
BucketPtr != E; ++BucketPtr) {
// Copy over the element if it is valid.
void *Elt = *BucketPtr;
if (Elt != getTombstoneMarker() && Elt != getEmptyMarker())
*const_cast<void**>(FindBucketFor(Elt)) = Elt;
}
}
}
SmallPtrSetImpl::SmallPtrSetImpl(const SmallPtrSetImpl& that) {
// If we're becoming small, prepare to insert into our stack space
if (that.isSmall()) {
CurArray = &SmallArray[0];
// Otherwise, allocate new heap space (unless we were the same size)
} else {
CurArray = (const void**)malloc(sizeof(void*) * (that.CurArraySize+1));
assert(CurArray && "Failed to allocate memory?");
}
// Copy over the new array size
CurArraySize = that.CurArraySize;
// Copy over the contents from the other set
memcpy(CurArray, that.CurArray, sizeof(void*)*(CurArraySize+1));
NumElements = that.NumElements;
NumTombstones = that.NumTombstones;
}
