#include <cstdlib>
namespace llvm {
-template <typename T> struct ReferenceAdder {
- typedef T &result;
-};
-template <typename T> struct ReferenceAdder<T &> {
- typedef T result;
-};
/// \brief CRTP base class providing obvious overloads for the core \c
/// Allocate() methods of LLVM-style allocators.
// The rest of these methods are helpers that redirect to one of the above
// core methods.
- /// \brief Allocate space for one object without constructing it.
- template <typename T> T *Allocate() {
- return static_cast<T *>(Allocate(sizeof(T), AlignOf<T>::Alignment));
- }
-
- /// \brief Allocate space for an array of objects without constructing them.
- template <typename T> T *Allocate(size_t Num) {
+ /// \brief Allocate space for a sequence of objects without constructing them.
+ template <typename T> T *Allocate(size_t Num = 1) {
return static_cast<T *>(Allocate(Num * sizeof(T), AlignOf<T>::Alignment));
}
- /// \brief Deallocate space for one object without destroying it.
+ /// \brief Deallocate space for a sequence of objects without constructing them.
template <typename T>
typename std::enable_if<
!std::is_same<typename std::remove_cv<T>::type, void>::value, void>::type
- Deallocate(T *Ptr) {
- Deallocate(static_cast<const void *>(Ptr), sizeof(T));
- }
-
- /// \brief Allocate space for an array of objects without constructing them.
- template <typename T>
- typename std::enable_if<
- !std::is_same<typename std::remove_cv<T>::type, void>::value, void>::type
- Deallocate(T *Ptr, size_t Num) {
+ Deallocate(T *Ptr, size_t Num = 1) {
Deallocate(static_cast<const void *>(Ptr), Num * sizeof(T));
}
};
class MallocAllocator : public AllocatorBase<MallocAllocator> {
public:
- MallocAllocator() {}
- ~MallocAllocator() {}
-
void Reset() {}
void *Allocate(size_t Size, size_t /*Alignment*/) { return malloc(Size); }
class BumpPtrAllocatorImpl
: public AllocatorBase<
BumpPtrAllocatorImpl<AllocatorT, SlabSize, SizeThreshold>> {
- BumpPtrAllocatorImpl(const BumpPtrAllocatorImpl &) LLVM_DELETED_FUNCTION;
- void operator=(const BumpPtrAllocatorImpl &) LLVM_DELETED_FUNCTION;
-
public:
static_assert(SizeThreshold <= SlabSize,
"The SizeThreshold must be at most the SlabSize to ensure "
BumpPtrAllocatorImpl(T &&Allocator)
: CurPtr(nullptr), End(nullptr), BytesAllocated(0),
Allocator(std::forward<T &&>(Allocator)) {}
+
+ // Manually implement a move constructor as we must clear the old allocators
+ // slabs as a matter of correctness.
+ BumpPtrAllocatorImpl(BumpPtrAllocatorImpl &&Old)
+ : CurPtr(Old.CurPtr), End(Old.End), Slabs(std::move(Old.Slabs)),
+ CustomSizedSlabs(std::move(Old.CustomSizedSlabs)),
+ BytesAllocated(Old.BytesAllocated),
+ Allocator(std::move(Old.Allocator)) {
+ Old.CurPtr = Old.End = nullptr;
+ Old.BytesAllocated = 0;
+ Old.Slabs.clear();
+ Old.CustomSizedSlabs.clear();
+ }
+
~BumpPtrAllocatorImpl() {
DeallocateSlabs(Slabs.begin(), Slabs.end());
DeallocateCustomSizedSlabs();
}
+ BumpPtrAllocatorImpl &operator=(BumpPtrAllocatorImpl &&RHS) {
+ DeallocateSlabs(Slabs.begin(), Slabs.end());
+ DeallocateCustomSizedSlabs();
+
+ CurPtr = RHS.CurPtr;
+ End = RHS.End;
+ BytesAllocated = RHS.BytesAllocated;
+ Slabs = std::move(RHS.Slabs);
+ CustomSizedSlabs = std::move(RHS.CustomSizedSlabs);
+ Allocator = std::move(RHS.Allocator);
+
+ RHS.CurPtr = RHS.End = nullptr;
+ RHS.BytesAllocated = 0;
+ RHS.Slabs.clear();
+ RHS.CustomSizedSlabs.clear();
+ return *this;
+ }
+
/// \brief Deallocate all but the current slab and reset the current pointer
/// to the beginning of it, freeing all memory allocated so far.
void Reset() {
public:
SpecificBumpPtrAllocator() : Allocator() {}
-
+ SpecificBumpPtrAllocator(SpecificBumpPtrAllocator &&Old)
+ : Allocator(std::move(Old.Allocator)) {}
~SpecificBumpPtrAllocator() { DestroyAll(); }
+ SpecificBumpPtrAllocator &operator=(SpecificBumpPtrAllocator &&RHS) {
+ Allocator = std::move(RHS.Allocator);
+ return *this;
+ }
+
/// Call the destructor of each allocated object and deallocate all but the
/// current slab and reset the current pointer to the beginning of it, freeing
/// all memory allocated so far.
/// \brief Allocate space for an array of objects without constructing them.
T *Allocate(size_t num = 1) { return Allocator.Allocate<T>(num); }
-
-private:
};
} // end namespace llvm