Example #1
0
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");

  // 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 {
      const void **T = (const void**)realloc(CurArray,
                                             sizeof(void*) * RHS.CurArraySize);
      if (!T)
        free(CurArray);
      CurArray = T;
    }
    assert(CurArray && "Failed to allocate memory?");
  }

  CopyHelper(RHS);
}
Example #2
0
void SmallPtrSetImplBase::swap(SmallPtrSetImplBase &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->NumNonEmpty, RHS.NumNonEmpty);
    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()) {
    assert(RHS.CurArray == RHS.SmallArray);
    std::copy(RHS.CurArray, RHS.CurArray + RHS.NumNonEmpty, this->SmallArray);
    std::swap(RHS.CurArraySize, this->CurArraySize);
    std::swap(this->NumNonEmpty, RHS.NumNonEmpty);
    std::swap(this->NumTombstones, RHS.NumTombstones);
    RHS.CurArray = this->CurArray;
    this->CurArray = this->SmallArray;
    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()) {
    assert(this->CurArray == this->SmallArray);
    std::copy(this->CurArray, this->CurArray + this->NumNonEmpty,
              RHS.SmallArray);
    std::swap(RHS.CurArraySize, this->CurArraySize);
    std::swap(RHS.NumNonEmpty, this->NumNonEmpty);
    std::swap(RHS.NumTombstones, this->NumTombstones);
    this->CurArray = RHS.CurArray;
    RHS.CurArray = RHS.SmallArray;
    return;
  }

  // Both a small, just swap the small elements.
  assert(this->isSmall() && RHS.isSmall());
  unsigned MinNonEmpty = std::min(this->NumNonEmpty, RHS.NumNonEmpty);
  std::swap_ranges(this->SmallArray, this->SmallArray + MinNonEmpty,
                   RHS.SmallArray);
  if (this->NumNonEmpty > MinNonEmpty) {
    std::copy(this->SmallArray + MinNonEmpty,
              this->SmallArray + this->NumNonEmpty,
              RHS.SmallArray + MinNonEmpty);
  } else {
    std::copy(RHS.SmallArray + MinNonEmpty, RHS.SmallArray + RHS.NumNonEmpty,
              this->SmallArray + MinNonEmpty);
  }
  assert(this->CurArraySize == RHS.CurArraySize);
  std::swap(this->NumNonEmpty, RHS.NumNonEmpty);
  std::swap(this->NumTombstones, RHS.NumTombstones);
}
Example #3
0
void SmallPtrSetImplBase::CopyHelper(const SmallPtrSetImplBase &RHS) {
  // Copy over the new array size
  CurArraySize = RHS.CurArraySize;

  // Copy over the contents from the other set
  std::copy(RHS.CurArray, RHS.EndPointer(), CurArray);

  NumNonEmpty = RHS.NumNonEmpty;
  NumTombstones = RHS.NumTombstones;
}
Example #4
0
SmallPtrSetImplBase::SmallPtrSetImplBase(const void **SmallStorage,
                                         const SmallPtrSetImplBase &that) {
  SmallArray = SmallStorage;

  // If we're becoming small, prepare to insert into our stack space
  if (that.isSmall()) {
    CurArray = SmallArray;
  // Otherwise, allocate new heap space (unless we were the same size)
  } else {
    CurArray = (const void**)safe_malloc(sizeof(void*) * that.CurArraySize);
  }

  // Copy over the that array.
  CopyHelper(that);
}