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This reverts commit r214260. Turns out move assignment *is* necessary for MSVC [1]. [1]: http://bb.pgr.jp/builders/ninja-clang-i686-msc17-R/builds/9631 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214264 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
//===- llvm/IR/UseListOrder.h - LLVM Use List Order functions ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file has functions to modify the use-list order and to verify that it
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// doesn't change after serialization.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_USELISTORDER_H
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#define LLVM_IR_USELISTORDER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include <vector>
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namespace llvm {
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class Module;
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class Function;
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class Value;
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/// \brief Structure to hold a use-list shuffle vector.
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///
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/// Stores most use-lists locally, but large use-lists use an extra heap entry.
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/// Costs two fewer pointers than the equivalent \a SmallVector.
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class UseListShuffleVector {
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unsigned Size;
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union {
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unsigned *Ptr;
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unsigned Array[6];
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} Storage;
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bool isSmall() const { return Size <= 6; }
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unsigned *data() { return isSmall() ? Storage.Array : Storage.Ptr; }
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const unsigned *data() const {
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return isSmall() ? Storage.Array : Storage.Ptr;
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}
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void destroy() {
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if (!isSmall())
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delete[] Storage.Ptr;
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}
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void moveUnchecked(UseListShuffleVector &X) {
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std::memcpy(this, &X, sizeof(UseListShuffleVector));
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X.Size = 0;
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}
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UseListShuffleVector(const UseListShuffleVector &X) LLVM_DELETED_FUNCTION;
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UseListShuffleVector &
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operator=(const UseListShuffleVector &X) LLVM_DELETED_FUNCTION;
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public:
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UseListShuffleVector() : Size(0) {}
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UseListShuffleVector(UseListShuffleVector &&X) { moveUnchecked(X); }
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UseListShuffleVector &operator=(UseListShuffleVector &&X) {
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destroy();
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moveUnchecked(X);
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return *this;
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}
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explicit UseListShuffleVector(size_t Size) : Size(Size) {
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if (!isSmall())
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Storage.Ptr = new unsigned[Size];
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}
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~UseListShuffleVector() { destroy(); }
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typedef unsigned *iterator;
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typedef const unsigned *const_iterator;
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size_t size() const { return Size; }
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iterator begin() { return data(); }
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iterator end() { return begin() + size(); }
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const_iterator begin() const { return data(); }
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const_iterator end() const { return begin() + size(); }
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unsigned &operator[](size_t I) { return data()[I]; }
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unsigned operator[](size_t I) const { return data()[I]; }
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};
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/// \brief Structure to hold a use-list order.
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struct UseListOrder {
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const Value *V;
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const Function *F;
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UseListShuffleVector Shuffle;
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UseListOrder(const Value *V, const Function *F, size_t ShuffleSize)
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: V(V), F(F), Shuffle(ShuffleSize) {}
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UseListOrder() : V(0), F(0) {}
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UseListOrder(UseListOrder &&X)
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: V(X.V), F(X.F), Shuffle(std::move(X.Shuffle)) {}
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UseListOrder &operator=(UseListOrder &&X) {
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V = X.V;
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F = X.F;
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Shuffle = std::move(X.Shuffle);
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return *this;
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}
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private:
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UseListOrder(const UseListOrder &X) LLVM_DELETED_FUNCTION;
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UseListOrder &operator=(const UseListOrder &X) LLVM_DELETED_FUNCTION;
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};
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typedef std::vector<UseListOrder> UseListOrderStack;
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/// \brief Whether to preserve use-list ordering.
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bool shouldPreserveBitcodeUseListOrder();
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bool shouldPreserveAssemblyUseListOrder();
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/// \brief Shuffle all use-lists in a module.
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///
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/// Adds \c SeedOffset to the default seed for the random number generator.
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void shuffleUseLists(Module &M, unsigned SeedOffset = 0);
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} // end namespace llvm
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#endif
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