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-rw-r--r--include/clang/AST/ASTVector.h405
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diff --git a/include/clang/AST/ASTVector.h b/include/clang/AST/ASTVector.h
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-//===- ASTVector.h - Vector that uses ASTContext for 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 ASTVector, a vector ADT whose contents are
-// allocated using the allocator associated with an ASTContext..
-//
-//===----------------------------------------------------------------------===//
-
-// FIXME: Most of this is copy-and-paste from BumpVector.h and SmallVector.h.
-// We can refactor this core logic into something common.
-
-#ifndef LLVM_CLANG_AST_ASTVECTOR_H
-#define LLVM_CLANG_AST_ASTVECTOR_H
-
-#include "clang/AST/AttrIterator.h"
-#include "llvm/ADT/PointerIntPair.h"
-#include "llvm/Support/Allocator.h"
-#include "llvm/Support/type_traits.h"
-#include <algorithm>
-#include <cstring>
-#include <memory>
-
-namespace clang {
- class ASTContext;
-
-template<typename T>
-class ASTVector {
-private:
- T *Begin, *End;
- llvm::PointerIntPair<T*, 1, bool> Capacity;
-
- void setEnd(T *P) { this->End = P; }
-
-protected:
- // Make a tag bit available to users of this class.
- // FIXME: This is a horrible hack.
- bool getTag() const { return Capacity.getInt(); }
- void setTag(bool B) { Capacity.setInt(B); }
-
-public:
- // Default ctor - Initialize to empty.
- ASTVector() : Begin(nullptr), End(nullptr), Capacity(nullptr, false) {}
-
- ASTVector(ASTVector &&O) : Begin(O.Begin), End(O.End), Capacity(O.Capacity) {
- O.Begin = O.End = nullptr;
- O.Capacity.setPointer(nullptr);
- O.Capacity.setInt(false);
- }
-
- ASTVector(const ASTContext &C, unsigned N)
- : Begin(nullptr), End(nullptr), Capacity(nullptr, false) {
- reserve(C, N);
- }
-
- ASTVector &operator=(ASTVector &&RHS) {
- ASTVector O(std::move(RHS));
- using std::swap;
- swap(Begin, O.Begin);
- swap(End, O.End);
- swap(Capacity, O.Capacity);
- return *this;
- }
-
- ~ASTVector() {
- 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, const ASTContext &C) {
- if (End < this->capacity_ptr()) {
- Retry:
- new (End) T(Elt);
- ++End;
- return;
- }
- grow(C);
- goto Retry;
- }
-
- void reserve(const ASTContext &C, unsigned N) {
- if (unsigned(this->capacity_ptr()-Begin) < N)
- grow(C, N);
- }
-
- /// capacity - Return the total number of elements in the currently allocated
- /// buffer.
- size_t capacity() const { return this->capacity_ptr() - Begin; }
-
- /// append - Add the specified range to the end of the SmallVector.
- ///
- template<typename in_iter>
- void append(const ASTContext &C, in_iter in_start, in_iter in_end) {
- size_type NumInputs = std::distance(in_start, in_end);
-
- if (NumInputs == 0)
- return;
-
- // Grow allocated space if needed.
- if (NumInputs > size_type(this->capacity_ptr()-this->end()))
- this->grow(C, this->size()+NumInputs);
-
- // Copy the new elements over.
- // TODO: NEED To compile time dispatch on whether in_iter is a random access
- // iterator to use the fast uninitialized_copy.
- std::uninitialized_copy(in_start, in_end, this->end());
- this->setEnd(this->end() + NumInputs);
- }
-
- /// append - Add the specified range to the end of the SmallVector.
- ///
- void append(const ASTContext &C, size_type NumInputs, const T &Elt) {
- // Grow allocated space if needed.
- if (NumInputs > size_type(this->capacity_ptr()-this->end()))
- this->grow(C, this->size()+NumInputs);
-
- // Copy the new elements over.
- std::uninitialized_fill_n(this->end(), NumInputs, Elt);
- this->setEnd(this->end() + NumInputs);
- }
-
- /// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
- /// starting with "Dest", constructing elements into it as needed.
- template<typename It1, typename It2>
- static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
- std::uninitialized_copy(I, E, Dest);
- }
-
- iterator insert(const ASTContext &C, iterator I, const T &Elt) {
- if (I == this->end()) { // Important special case for empty vector.
- push_back(Elt, C);
- return this->end()-1;
- }
-
- if (this->End < this->capacity_ptr()) {
- Retry:
- new (this->end()) T(this->back());
- this->setEnd(this->end()+1);
- // Push everything else over.
- std::copy_backward(I, this->end()-1, this->end());
- *I = Elt;
- return I;
- }
- size_t EltNo = I-this->begin();
- this->grow(C);
- I = this->begin()+EltNo;
- goto Retry;
- }
-
- iterator insert(const ASTContext &C, iterator I, size_type NumToInsert,
- const T &Elt) {
- // Convert iterator to elt# to avoid invalidating iterator when we reserve()
- size_t InsertElt = I - this->begin();
-
- if (I == this->end()) { // Important special case for empty vector.
- append(C, NumToInsert, Elt);
- return this->begin() + InsertElt;
- }
-
- // Ensure there is enough space.
- reserve(C, static_cast<unsigned>(this->size() + NumToInsert));
-
- // Uninvalidate the iterator.
- I = this->begin()+InsertElt;
-
- // If there are more elements between the insertion point and the end of the
- // range than there are being inserted, we can use a simple approach to
- // insertion. Since we already reserved space, we know that this won't
- // reallocate the vector.
- if (size_t(this->end()-I) >= NumToInsert) {
- T *OldEnd = this->end();
- append(C, this->end()-NumToInsert, this->end());
-
- // Copy the existing elements that get replaced.
- std::copy_backward(I, OldEnd-NumToInsert, OldEnd);
-
- std::fill_n(I, NumToInsert, Elt);
- return I;
- }
-
- // Otherwise, we're inserting more elements than exist already, and we're
- // not inserting at the end.
-
- // Copy over the elements that we're about to overwrite.
- T *OldEnd = this->end();
- this->setEnd(this->end() + NumToInsert);
- size_t NumOverwritten = OldEnd-I;
- this->uninitialized_copy(I, OldEnd, this->end()-NumOverwritten);
-
- // Replace the overwritten part.
- std::fill_n(I, NumOverwritten, Elt);
-
- // Insert the non-overwritten middle part.
- std::uninitialized_fill_n(OldEnd, NumToInsert-NumOverwritten, Elt);
- return I;
- }
-
- template<typename ItTy>
- iterator insert(const ASTContext &C, iterator I, ItTy From, ItTy To) {
- // Convert iterator to elt# to avoid invalidating iterator when we reserve()
- size_t InsertElt = I - this->begin();
-
- if (I == this->end()) { // Important special case for empty vector.
- append(C, From, To);
- return this->begin() + InsertElt;
- }
-
- size_t NumToInsert = std::distance(From, To);
-
- // Ensure there is enough space.
- reserve(C, static_cast<unsigned>(this->size() + NumToInsert));
-
- // Uninvalidate the iterator.
- I = this->begin()+InsertElt;
-
- // If there are more elements between the insertion point and the end of the
- // range than there are being inserted, we can use a simple approach to
- // insertion. Since we already reserved space, we know that this won't
- // reallocate the vector.
- if (size_t(this->end()-I) >= NumToInsert) {
- T *OldEnd = this->end();
- append(C, this->end()-NumToInsert, this->end());
-
- // Copy the existing elements that get replaced.
- std::copy_backward(I, OldEnd-NumToInsert, OldEnd);
-
- std::copy(From, To, I);
- return I;
- }
-
- // Otherwise, we're inserting more elements than exist already, and we're
- // not inserting at the end.
-
- // Copy over the elements that we're about to overwrite.
- T *OldEnd = this->end();
- this->setEnd(this->end() + NumToInsert);
- size_t NumOverwritten = OldEnd-I;
- this->uninitialized_copy(I, OldEnd, this->end()-NumOverwritten);
-
- // Replace the overwritten part.
- for (; NumOverwritten > 0; --NumOverwritten) {
- *I = *From;
- ++I; ++From;
- }
-
- // Insert the non-overwritten middle part.
- this->uninitialized_copy(From, To, OldEnd);
- return I;
- }
-
- void resize(const ASTContext &C, unsigned N, const T &NV) {
- if (N < this->size()) {
- this->destroy_range(this->begin()+N, this->end());
- this->setEnd(this->begin()+N);
- } else if (N > this->size()) {
- if (this->capacity() < N)
- this->grow(C, N);
- construct_range(this->end(), this->begin()+N, NV);
- this->setEnd(this->begin()+N);
- }
- }
-
-private:
- /// grow - double the size of the allocated memory, guaranteeing space for at
- /// least one more element or MinSize if specified.
- void grow(const ASTContext &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();
- }
- }
-
-protected:
- const_iterator capacity_ptr() const {
- return (iterator) Capacity.getPointer();
- }
- iterator capacity_ptr() { return (iterator)Capacity.getPointer(); }
-};
-
-// Define this out-of-line to dissuade the C++ compiler from inlining it.
-template <typename T>
-void ASTVector<T>::grow(const ASTContext &C, size_t MinSize) {
- size_t CurCapacity = this->capacity();
- size_t CurSize = size();
- size_t NewCapacity = 2*CurCapacity;
- if (NewCapacity < MinSize)
- NewCapacity = MinSize;
-
- // Allocate the memory from the ASTContext.
- T *NewElts = new (C, llvm::alignOf<T>()) 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));
- }
- }
-
- // ASTContext never frees any memory.
- Begin = NewElts;
- End = NewElts+CurSize;
- Capacity.setPointer(Begin+NewCapacity);
-}
-
-} // end: clang namespace
-#endif
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