SourceMgr.h revision 360660 
1//===--------------------- SourceMgr.h --------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8/// \file
9/// This file implements class SourceMgr. Class SourceMgr abstracts the input
10/// code sequence (a sequence of MCInst), and assings unique identifiers to
11/// every instruction in the sequence.
12///
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_MCA_SOURCEMGR_H
16#define LLVM_MCA_SOURCEMGR_H
17
18#include "llvm/ADT/ArrayRef.h"
19
20namespace llvm {
21namespace mca {
22
23class Instruction;
24
25typedef std::pair<unsigned, const Instruction &> SourceRef;
26
27class SourceMgr {
28  using UniqueInst = std::unique_ptr<Instruction>;
29  ArrayRef<UniqueInst> Sequence;
30  unsigned Current;
31  const unsigned Iterations;
32  static const unsigned DefaultIterations = 100;
33
34public:
35  SourceMgr(ArrayRef<UniqueInst> S, unsigned Iter)
36      : Sequence(S), Current(0), Iterations(Iter ? Iter : DefaultIterations) {}
37
38  unsigned getNumIterations() const { return Iterations; }
39  unsigned size() const { return Sequence.size(); }
40  bool hasNext() const { return Current < (Iterations * Sequence.size()); }
41  void updateNext() { ++Current; }
42
43  SourceRef peekNext() const {
44    assert(hasNext() && "Already at end of sequence!");
45    return SourceRef(Current, *Sequence[Current % Sequence.size()]);
46  }
47
48  using const_iterator = ArrayRef<UniqueInst>::const_iterator;
49  const_iterator begin() const { return Sequence.begin(); }
50  const_iterator end() const { return Sequence.end(); }
51};
52
53} // namespace mca
54} // namespace llvm
55
56#endif // LLVM_MCA_SOURCEMGR_H
57