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Diffstat (limited to 'include/clang/Analysis/Support/BumpVector.h')
-rw-r--r-- | include/clang/Analysis/Support/BumpVector.h | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/include/clang/Analysis/Support/BumpVector.h b/include/clang/Analysis/Support/BumpVector.h deleted file mode 100644 index 591d17b..0000000 --- a/include/clang/Analysis/Support/BumpVector.h +++ /dev/null @@ -1,250 +0,0 @@ -//===-- BumpVector.h - Vector-like ADT that uses bump allocation --*- C++ -*-=// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file provides BumpVector, a vector-like ADT whose contents are -// allocated from a BumpPtrAllocator. -// -//===----------------------------------------------------------------------===// - -// FIXME: Most of this is copy-and-paste from SmallVector.h. We can -// refactor this core logic into something common that is shared between -// the two. The main thing that is different is the allocation strategy. - -#ifndef LLVM_CLANG_ANALYSIS_SUPPORT_BUMPVECTOR_H -#define LLVM_CLANG_ANALYSIS_SUPPORT_BUMPVECTOR_H - -#include "llvm/ADT/PointerIntPair.h" -#include "llvm/Support/Allocator.h" -#include "llvm/Support/type_traits.h" -#include <algorithm> -#include <cstring> -#include <iterator> -#include <memory> - -namespace clang { - -class BumpVectorContext { - llvm::PointerIntPair<llvm::BumpPtrAllocator*, 1> Alloc; -public: - /// Construct a new BumpVectorContext that creates a new BumpPtrAllocator - /// and destroys it when the BumpVectorContext object is destroyed. - BumpVectorContext() : Alloc(new llvm::BumpPtrAllocator(), 1) {} - - BumpVectorContext(BumpVectorContext &&Other) : Alloc(Other.Alloc) { - Other.Alloc.setInt(false); - Other.Alloc.setPointer(nullptr); - } - - /// Construct a new BumpVectorContext that reuses an existing - /// BumpPtrAllocator. This BumpPtrAllocator is not destroyed when the - /// BumpVectorContext object is destroyed. - BumpVectorContext(llvm::BumpPtrAllocator &A) : Alloc(&A, 0) {} - - ~BumpVectorContext() { - if (Alloc.getInt()) - delete Alloc.getPointer(); - } - - llvm::BumpPtrAllocator &getAllocator() { return *Alloc.getPointer(); } -}; - -template<typename T> -class BumpVector { - T *Begin, *End, *Capacity; -public: - // Default ctor - Initialize to empty. - explicit BumpVector(BumpVectorContext &C, unsigned N) - : Begin(nullptr), End(nullptr), Capacity(nullptr) { - reserve(C, N); - } - - ~BumpVector() { - if (std::is_class<T>::value) { - // Destroy the constructed elements in the vector. - destroy_range(Begin, End); - } - } - - typedef size_t size_type; - typedef ptrdiff_t difference_type; - typedef T value_type; - typedef T* iterator; - typedef const T* const_iterator; - - typedef std::reverse_iterator<const_iterator> const_reverse_iterator; - typedef std::reverse_iterator<iterator> reverse_iterator; - - typedef T& reference; - typedef const T& const_reference; - typedef T* pointer; - typedef const T* const_pointer; - - // forward iterator creation methods. - iterator begin() { return Begin; } - const_iterator begin() const { return Begin; } - iterator end() { return End; } - const_iterator end() const { return End; } - - // reverse iterator creation methods. - reverse_iterator rbegin() { return reverse_iterator(end()); } - const_reverse_iterator rbegin() const{ return const_reverse_iterator(end()); } - reverse_iterator rend() { return reverse_iterator(begin()); } - const_reverse_iterator rend() const { return const_reverse_iterator(begin());} - - bool empty() const { return Begin == End; } - size_type size() const { return End-Begin; } - - reference operator[](unsigned idx) { - assert(Begin + idx < End); - return Begin[idx]; - } - const_reference operator[](unsigned idx) const { - assert(Begin + idx < End); - return Begin[idx]; - } - - reference front() { - return begin()[0]; - } - const_reference front() const { - return begin()[0]; - } - - reference back() { - return end()[-1]; - } - const_reference back() const { - return end()[-1]; - } - - void pop_back() { - --End; - End->~T(); - } - - T pop_back_val() { - T Result = back(); - pop_back(); - return Result; - } - - void clear() { - if (std::is_class<T>::value) { - destroy_range(Begin, End); - } - End = Begin; - } - - /// data - Return a pointer to the vector's buffer, even if empty(). - pointer data() { - return pointer(Begin); - } - - /// data - Return a pointer to the vector's buffer, even if empty(). - const_pointer data() const { - return const_pointer(Begin); - } - - void push_back(const_reference Elt, BumpVectorContext &C) { - if (End < Capacity) { - Retry: - new (End) T(Elt); - ++End; - return; - } - grow(C); - goto Retry; - } - - /// insert - Insert some number of copies of element into a position. Return - /// iterator to position after last inserted copy. - iterator insert(iterator I, size_t Cnt, const_reference E, - BumpVectorContext &C) { - assert (I >= Begin && I <= End && "Iterator out of bounds."); - if (End + Cnt <= Capacity) { - Retry: - move_range_right(I, End, Cnt); - construct_range(I, I + Cnt, E); - End += Cnt; - return I + Cnt; - } - ptrdiff_t D = I - Begin; - grow(C, size() + Cnt); - I = Begin + D; - goto Retry; - } - - void reserve(BumpVectorContext &C, unsigned N) { - if (unsigned(Capacity-Begin) < N) - grow(C, N); - } - - /// capacity - Return the total number of elements in the currently allocated - /// buffer. - size_t capacity() const { return Capacity - Begin; } - -private: - /// grow - double the size of the allocated memory, guaranteeing space for at - /// least one more element or MinSize if specified. - void grow(BumpVectorContext &C, size_type MinSize = 1); - - void construct_range(T *S, T *E, const T &Elt) { - for (; S != E; ++S) - new (S) T(Elt); - } - - void destroy_range(T *S, T *E) { - while (S != E) { - --E; - E->~T(); - } - } - - void move_range_right(T *S, T *E, size_t D) { - for (T *I = E + D - 1, *IL = S + D - 1; I != IL; --I) { - --E; - new (I) T(*E); - E->~T(); - } - } -}; - -// Define this out-of-line to dissuade the C++ compiler from inlining it. -template <typename T> -void BumpVector<T>::grow(BumpVectorContext &C, size_t MinSize) { - size_t CurCapacity = Capacity-Begin; - size_t CurSize = size(); - size_t NewCapacity = 2*CurCapacity; - if (NewCapacity < MinSize) - NewCapacity = MinSize; - - // Allocate the memory from the BumpPtrAllocator. - T *NewElts = C.getAllocator().template Allocate<T>(NewCapacity); - - // Copy the elements over. - if (Begin != End) { - if (std::is_class<T>::value) { - std::uninitialized_copy(Begin, End, NewElts); - // Destroy the original elements. - destroy_range(Begin, End); - } else { - // Use memcpy for PODs (std::uninitialized_copy optimizes to memmove). - memcpy(NewElts, Begin, CurSize * sizeof(T)); - } - } - - // For now, leak 'Begin'. We can add it back to a freelist in - // BumpVectorContext. - Begin = NewElts; - End = NewElts+CurSize; - Capacity = Begin+NewCapacity; -} - -} // end: clang namespace -#endif |