6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
//===--------------------- SourceMgr.h --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file contains abstract class SourceMgr and the default implementation,
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/// CircularSourceMgr.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MCA_SOURCEMGR_H
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#define LLVM_MCA_SOURCEMGR_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/MCA/Instruction.h"
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namespace llvm {
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namespace mca {
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// MSVC >= 19.15, < 19.20 need to see the definition of class Instruction to
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// prevent compiler error C2139 about intrinsic type trait '__is_assignable'.
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typedef std::pair<unsigned, const Instruction &> SourceRef;
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/// Abstracting the input code sequence (a sequence of MCInst) and assigning
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/// unique identifiers to every instruction in the sequence.
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struct SourceMgr {
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using UniqueInst = std::unique_ptr<Instruction>;
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/// Provides a fixed range of \a UniqueInst to iterate.
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virtual ArrayRef<UniqueInst> getInstructions() const = 0;
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/// (Fixed) Number of \a UniqueInst. Returns the size of
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/// \a getInstructions by default.
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virtual size_t size() const { return getInstructions().size(); }
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/// Whether there is any \a SourceRef to inspect / peek next.
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/// Note that returning false from this doesn't mean the instruction
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/// stream has ended.
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virtual bool hasNext() const = 0;
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/// Whether the instruction stream has eneded.
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virtual bool isEnd() const = 0;
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/// The next \a SourceRef.
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virtual SourceRef peekNext() const = 0;
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/// Advance to the next \a SourceRef.
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virtual void updateNext() = 0;
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virtual ~SourceMgr() {}
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};
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/// The default implementation of \a SourceMgr. It always takes a fixed number
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/// of instructions and provides an option to loop the given sequence for a
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/// certain iterations.
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class CircularSourceMgr : public SourceMgr {
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ArrayRef<UniqueInst> Sequence;
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unsigned Current;
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const unsigned Iterations;
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static const unsigned DefaultIterations = 100;
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public:
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CircularSourceMgr(ArrayRef<UniqueInst> S, unsigned Iter)
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: Sequence(S), Current(0U), Iterations(Iter ? Iter : DefaultIterations) {}
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ArrayRef<UniqueInst> getInstructions() const override { return Sequence; }
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unsigned getNumIterations() const { return Iterations; }
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bool hasNext() const override {
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return Current < (Iterations * Sequence.size());
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}
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bool isEnd() const override { return !hasNext(); }
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SourceRef peekNext() const override {
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assert(hasNext() && "Already at end of sequence!");
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return SourceRef(Current, *Sequence[Current % Sequence.size()]);
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}
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void updateNext() override { ++Current; }
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};
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} // namespace mca
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} // namespace llvm
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#endif // LLVM_MCA_SOURCEMGR_H
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