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59c89e56ce
This will speed up the optimizer by reducing the amount of allocations we perform while running the optimizer. Swift SVN r18762
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//===- PreallocatedArray.h - Fixed size array -------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_PREALLOCATEDARRAY_H_
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#define SWIFT_BASIC_PREALLOCATEDARRAY_H_
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#include "llvm/Support/Allocator.h"
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#include "swift/Basic/NullablePtr.h"
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#include <type_traits>
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namespace swift {
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/// An array meant for large collections of default constructible elements of
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/// fixed size. It does one large allocation on construction.
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template <typename EltTy, typename AllocatorTy = llvm::MallocAllocator>
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class PreallocatedArray {
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static_assert(std::is_default_constructible<EltTy>::value,
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"EltTy must be default constructable.");
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unsigned NumElts;
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NullablePtr<AllocatorTy> Allocator;
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EltTy *Elts;
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public:
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PreallocatedArray(unsigned NumElts)
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: NumElts(NumElts), Allocator(new AllocatorTy()),
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Elts(new (Allocator.get()->template Allocate<EltTy>(NumElts))
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EltTy[NumElts]) {}
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PreallocatedArray(unsigned NumElts, AllocatorTy *InputAllocator)
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: NumElts(NumElts), Allocator(InputAllocator),
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Elts(new (Allocator.get()->template Allocate<EltTy>(NumElts)) EltTy[NumElts]) {
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}
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~PreallocatedArray() {
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// Call destructors of data.
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for (unsigned i = 0; i < NumElts; ++i) {
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Elts[i].~EltTy();
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}
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// And deallocate the memory.
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Allocator.get()->template Deallocate<EltTy>(Elts, NumElts);
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}
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llvm::MutableArrayRef<EltTy> getArray() {
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return llvm::MutableArrayRef<EltTy>(Elts, NumElts);
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}
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llvm::ArrayRef<EltTy> getArray() const {
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return llvm::ArrayRef<EltTy>(Elts, NumElts);
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}
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using iterator = typename llvm::MutableArrayRef<EltTy>::iterator;
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using const_iterator = typename llvm::ArrayRef<EltTy>::iterator;
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iterator begin() { return getArray().begin(); }
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iterator end() { return getArray().end(); }
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const_iterator begin() const { return getArray().begin(); }
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const_iterator end() const { return getArray().end(); }
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Range<iterator> getRange() {
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return {begin(), end()};
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}
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Range<const_iterator> getRange() const {
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return {begin(), end()};
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}
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unsigned size() const { return NumElts; }
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EltTy &operator[](size_t Index) { return getArray()[Index]; }
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};
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} // end namespace swift
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#endif
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