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 #include "llvm/MCA/Instruction.h"
20 
21 namespace llvm {
22 namespace mca {
23 
24 // MSVC >= 19.15, < 19.20 need to see the definition of class Instruction to
25 // prevent compiler error C2139 about intrinsic type trait '__is_assignable'.
26 typedef std::pair<unsigned, const Instruction &> SourceRef;
27 
28 class SourceMgr {
29   using UniqueInst = std::unique_ptr<Instruction>;
30   ArrayRef<UniqueInst> Sequence;
31   unsigned Current;
32   const unsigned Iterations;
33   static const unsigned DefaultIterations = 100;
34 
35 public:
36   SourceMgr(ArrayRef<UniqueInst> S, unsigned Iter)
37       : Sequence(S), Current(0), Iterations(Iter ? Iter : DefaultIterations) {}
38 
39   unsigned getNumIterations() const { return Iterations; }
40   unsigned size() const { return Sequence.size(); }
41   bool hasNext() const { return Current < (Iterations * Sequence.size()); }
42   void updateNext() { ++Current; }
43 
44   SourceRef peekNext() const {
45     assert(hasNext() && "Already at end of sequence!");
46     return SourceRef(Current, *Sequence[Current % Sequence.size()]);
47   }
48 
49   using const_iterator = ArrayRef<UniqueInst>::const_iterator;
50   const_iterator begin() const { return Sequence.begin(); }
51   const_iterator end() const { return Sequence.end(); }
52 };
53 
54 } // namespace mca
55 } // namespace llvm
56 
57 #endif // LLVM_MCA_SOURCEMGR_H
58