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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33714 91177308-0d34-0410-b5e6-96231b3b80d8
462 lines
12 KiB
C++
462 lines
12 KiB
C++
//===- llvm/ADT/SmallVector.h - 'Normally small' vectors --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the SmallVector class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_SMALLVECTOR_H
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#define LLVM_ADT_SMALLVECTOR_H
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#include <algorithm>
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#include <iterator>
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#include <memory>
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namespace llvm {
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/// SmallVectorImpl - This class consists of common code factored out of the
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/// SmallVector class to reduce code duplication based on the SmallVector 'N'
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/// template parameter.
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template <typename T>
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class SmallVectorImpl {
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protected:
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T *Begin, *End, *Capacity;
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// Allocate raw space for N elements of type T. If T has a ctor or dtor, we
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// don't want it to be automatically run, so we need to represent the space as
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// something else. An array of char would work great, but might not be
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// aligned sufficiently. Instead, we either use GCC extensions, or some
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// number of union instances for the space, which guarantee maximal alignment.
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protected:
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#ifdef __GNUC__
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typedef char U;
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U FirstEl __attribute__((aligned));
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#else
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union U {
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double D;
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long double LD;
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long long L;
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void *P;
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} FirstEl;
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#endif
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// Space after 'FirstEl' is clobbered, do not add any instance vars after it.
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public:
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// Default ctor - Initialize to empty.
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SmallVectorImpl(unsigned N)
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: Begin((T*)&FirstEl), End((T*)&FirstEl), Capacity((T*)&FirstEl+N) {
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}
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~SmallVectorImpl() {
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// Destroy the constructed elements in the vector.
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destroy_range(Begin, End);
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// If this wasn't grown from the inline copy, deallocate the old space.
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if (!isSmall())
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delete[] (char*)Begin;
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}
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typedef size_t size_type;
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typedef T* iterator;
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typedef const T* const_iterator;
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typedef T& reference;
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typedef const T& const_reference;
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bool empty() const { return Begin == End; }
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size_type size() const { return End-Begin; }
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iterator begin() { return Begin; }
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const_iterator begin() const { return Begin; }
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iterator end() { return End; }
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const_iterator end() const { return End; }
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reference operator[](unsigned idx) {
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return Begin[idx];
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}
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const_reference operator[](unsigned idx) const {
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return Begin[idx];
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}
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reference front() {
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return begin()[0];
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}
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const_reference front() const {
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return begin()[0];
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}
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reference back() {
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return end()[-1];
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}
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const_reference back() const {
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return end()[-1];
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}
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void push_back(const_reference Elt) {
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if (End < Capacity) {
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Retry:
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new (End) T(Elt);
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++End;
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return;
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}
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grow();
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goto Retry;
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}
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void pop_back() {
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--End;
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End->~T();
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}
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void clear() {
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destroy_range(Begin, End);
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End = Begin;
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}
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void resize(unsigned N) {
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if (N < size()) {
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destroy_range(Begin+N, End);
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End = Begin+N;
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} else if (N > size()) {
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if (Begin+N > Capacity)
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grow(N);
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construct_range(End, Begin+N, T());
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End = Begin+N;
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}
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}
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void resize(unsigned N, const T &NV) {
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if (N < size()) {
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destroy_range(Begin+N, End);
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End = Begin+N;
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} else if (N > size()) {
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if (Begin+N > Capacity)
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grow(N);
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construct_range(End, Begin+N, NV);
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End = Begin+N;
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}
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}
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void reserve(unsigned N) {
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if (unsigned(Capacity-Begin) < N)
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grow(N);
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}
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void swap(SmallVectorImpl &RHS);
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/// append - Add the specified range to the end of the SmallVector.
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///
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template<typename in_iter>
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void append(in_iter in_start, in_iter in_end) {
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unsigned NumInputs = std::distance(in_start, in_end);
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// Grow allocated space if needed.
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if (End+NumInputs > Capacity)
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grow(size()+NumInputs);
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// Copy the new elements over.
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std::uninitialized_copy(in_start, in_end, End);
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End += NumInputs;
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}
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void assign(unsigned NumElts, const T &Elt) {
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clear();
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if (Begin+NumElts > Capacity)
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grow(NumElts);
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End = Begin+NumElts;
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construct_range(Begin, End, Elt);
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}
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void erase(iterator I) {
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// Shift all elts down one.
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std::copy(I+1, End, I);
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// Drop the last elt.
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pop_back();
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}
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void erase(iterator S, iterator E) {
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// Shift all elts down.
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iterator I = std::copy(E, End, S);
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// Drop the last elts.
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destroy_range(I, End);
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End = I;
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}
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iterator insert(iterator I, const T &Elt) {
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if (I == End) { // Important special case for empty vector.
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push_back(Elt);
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return end()-1;
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}
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if (End < Capacity) {
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Retry:
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new (End) T(back());
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++End;
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// Push everything else over.
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std::copy_backward(I, End-1, End);
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*I = Elt;
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return I;
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}
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unsigned EltNo = I-Begin;
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grow();
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I = Begin+EltNo;
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goto Retry;
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}
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template<typename ItTy>
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iterator insert(iterator I, ItTy From, ItTy To) {
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if (I == End) { // Important special case for empty vector.
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append(From, To);
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return end()-1;
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}
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unsigned NumToInsert = std::distance(From, To);
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// Convert iterator to elt# to avoid invalidating iterator when we reserve()
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unsigned InsertElt = I-begin();
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// Ensure there is enough space.
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reserve(size() + NumToInsert);
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// Uninvalidate the iterator.
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I = begin()+InsertElt;
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// If we already have this many elements in the collection, append the
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// dest elements at the end, then copy over the appropriate elements. Since
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// we already reserved space, we know that this won't reallocate the vector.
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if (size() >= NumToInsert) {
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T *OldEnd = End;
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append(End-NumToInsert, End);
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// Copy the existing elements that get replaced.
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std::copy(I, OldEnd-NumToInsert, I+NumToInsert);
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std::copy(From, To, I);
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return I;
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}
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// Otherwise, we're inserting more elements than exist already, and we're
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// not inserting at the end.
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// Copy over the elements that we're about to overwrite.
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T *OldEnd = End;
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End += NumToInsert;
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unsigned NumOverwritten = OldEnd-I;
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std::uninitialized_copy(I, OldEnd, End-NumOverwritten);
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// Replace the overwritten part.
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std::copy(From, From+NumOverwritten, I);
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// Insert the non-overwritten middle part.
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std::uninitialized_copy(From+NumOverwritten, To, OldEnd);
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return I;
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}
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const SmallVectorImpl &operator=(const SmallVectorImpl &RHS);
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private:
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/// isSmall - Return true if this is a smallvector which has not had dynamic
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/// memory allocated for it.
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bool isSmall() const {
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return (void*)Begin == (void*)&FirstEl;
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}
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/// grow - double the size of the allocated memory, guaranteeing space for at
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/// least one more element or MinSize if specified.
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void grow(unsigned MinSize = 0);
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void construct_range(T *S, T *E, const T &Elt) {
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for (; S != E; ++S)
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new (S) T(Elt);
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}
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void destroy_range(T *S, T *E) {
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while (S != E) {
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E->~T();
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--E;
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}
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}
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};
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// Define this out-of-line to dissuade the C++ compiler from inlining it.
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template <typename T>
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void SmallVectorImpl<T>::grow(unsigned MinSize) {
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unsigned CurCapacity = Capacity-Begin;
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unsigned CurSize = size();
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unsigned NewCapacity = 2*CurCapacity;
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if (NewCapacity < MinSize)
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NewCapacity = MinSize;
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T *NewElts = reinterpret_cast<T*>(new char[NewCapacity*sizeof(T)]);
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// Copy the elements over.
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std::uninitialized_copy(Begin, End, NewElts);
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// Destroy the original elements.
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destroy_range(Begin, End);
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// If this wasn't grown from the inline copy, deallocate the old space.
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if (!isSmall())
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delete[] (char*)Begin;
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Begin = NewElts;
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End = NewElts+CurSize;
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Capacity = Begin+NewCapacity;
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}
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template <typename T>
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void SmallVectorImpl<T>::swap(SmallVectorImpl<T> &RHS) {
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if (this == &RHS) return;
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// We can only avoid copying elements if neither vector is small.
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if (!isSmall() && !RHS.isSmall()) {
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std::swap(Begin, RHS.Begin);
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std::swap(End, RHS.End);
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std::swap(Capacity, RHS.Capacity);
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return;
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}
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if (Begin+RHS.size() > Capacity)
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grow(RHS.size());
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if (RHS.begin()+size() > RHS.Capacity)
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RHS.grow(size());
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// Swap the shared elements.
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unsigned NumShared = size();
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if (NumShared > RHS.size()) NumShared = RHS.size();
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for (unsigned i = 0; i != NumShared; ++i)
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std::swap(Begin[i], RHS[i]);
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// Copy over the extra elts.
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if (size() > RHS.size()) {
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unsigned EltDiff = size() - RHS.size();
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std::uninitialized_copy(Begin+NumShared, End, RHS.End);
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RHS.End += EltDiff;
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destroy_range(Begin+NumShared, End);
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End = Begin+NumShared;
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} else if (RHS.size() > size()) {
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unsigned EltDiff = RHS.size() - size();
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std::uninitialized_copy(RHS.Begin+NumShared, RHS.End, End);
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End += EltDiff;
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destroy_range(RHS.Begin+NumShared, RHS.End);
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RHS.End = RHS.Begin+NumShared;
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}
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}
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template <typename T>
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const SmallVectorImpl<T> &
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SmallVectorImpl<T>::operator=(const SmallVectorImpl<T> &RHS) {
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// Avoid self-assignment.
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if (this == &RHS) return *this;
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// If we already have sufficient space, assign the common elements, then
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// destroy any excess.
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unsigned RHSSize = RHS.size();
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unsigned CurSize = size();
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if (CurSize >= RHSSize) {
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// Assign common elements.
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iterator NewEnd = std::copy(RHS.Begin, RHS.Begin+RHSSize, Begin);
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// Destroy excess elements.
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destroy_range(NewEnd, End);
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// Trim.
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End = NewEnd;
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return *this;
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}
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// If we have to grow to have enough elements, destroy the current elements.
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// This allows us to avoid copying them during the grow.
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if (unsigned(Capacity-Begin) < RHSSize) {
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// Destroy current elements.
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destroy_range(Begin, End);
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End = Begin;
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CurSize = 0;
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grow(RHSSize);
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} else if (CurSize) {
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// Otherwise, use assignment for the already-constructed elements.
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std::copy(RHS.Begin, RHS.Begin+CurSize, Begin);
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}
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// Copy construct the new elements in place.
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std::uninitialized_copy(RHS.Begin+CurSize, RHS.End, Begin+CurSize);
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// Set end.
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End = Begin+RHSSize;
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return *this;
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}
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/// SmallVector - This is a 'vector' (really, a variable-sized array), optimized
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/// for the case when the array is small. It contains some number of elements
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/// in-place, which allows it to avoid heap allocation when the actual number of
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/// elements is below that threshold. This allows normal "small" cases to be
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/// fast without losing generality for large inputs.
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///
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/// Note that this does not attempt to be exception safe.
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///
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template <typename T, unsigned N>
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class SmallVector : public SmallVectorImpl<T> {
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/// InlineElts - These are 'N-1' elements that are stored inline in the body
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/// of the vector. The extra '1' element is stored in SmallVectorImpl.
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typedef typename SmallVectorImpl<T>::U U;
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enum {
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// MinUs - The number of U's require to cover N T's.
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MinUs = (sizeof(T)*N+sizeof(U)-1)/sizeof(U),
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// NumInlineEltsElts - The number of elements actually in this array. There
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// is already one in the parent class, and we have to round up to avoid
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// having a zero-element array.
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NumInlineEltsElts = (MinUs - 1) > 0 ? (MinUs - 1) : 1,
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// NumTsAvailable - The number of T's we actually have space for, which may
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// be more than N due to rounding.
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NumTsAvailable = (NumInlineEltsElts+1)*sizeof(U) / sizeof(T)
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};
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U InlineElts[NumInlineEltsElts];
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public:
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SmallVector() : SmallVectorImpl<T>(NumTsAvailable) {
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}
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SmallVector(unsigned Size, const T &Value)
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: SmallVectorImpl<T>(NumTsAvailable) {
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this->reserve(Size);
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while (Size--)
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push_back(Value);
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}
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template<typename ItTy>
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SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(NumTsAvailable) {
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append(S, E);
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}
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SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(NumTsAvailable) {
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operator=(RHS);
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}
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const SmallVector &operator=(const SmallVector &RHS) {
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SmallVectorImpl<T>::operator=(RHS);
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return *this;
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}
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};
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} // End llvm namespace
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namespace std {
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/// Implement std::swap in terms of SmallVector swap.
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template<typename T>
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inline void
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swap(llvm::SmallVectorImpl<T> &LHS, llvm::SmallVectorImpl<T> &RHS) {
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LHS.swap(RHS);
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}
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/// Implement std::swap in terms of SmallVector swap.
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template<typename T, unsigned N>
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inline void
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swap(llvm::SmallVector<T, N> &LHS, llvm::SmallVector<T, N> &RHS) {
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LHS.swap(RHS);
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}
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}
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#endif
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