| 1 | //===-- NoopLattice.h -------------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines the lattice with exactly one element. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H |
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| 14 | #define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H |
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| 15 | |
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| 16 | #include "clang/Analysis/FlowSensitive/DataflowLattice.h" |
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| 17 | #include <ostream> |
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| 18 | |
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| 19 | namespace clang { |
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| 20 | namespace dataflow { |
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| 21 | |
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| 22 | /// Trivial lattice for dataflow analysis with exactly one element. |
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| 23 | /// |
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| 24 | /// Useful for analyses that only need the Environment and nothing more. |
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| 25 | class NoopLattice { |
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| 26 | public: |
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| 27 | bool operator==(const NoopLattice &Other) const { return true; } |
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| 28 | |
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| 29 | LatticeJoinEffect join(const NoopLattice &Other) { |
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| 30 | return LatticeJoinEffect::Unchanged; |
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| 31 | } |
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| 32 | }; |
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| 33 | |
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| 34 | inline std::ostream &operator<<(std::ostream &OS, const NoopLattice &) { |
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| 35 | return OS << "noop" ; |
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| 36 | } |
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| 37 | |
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| 38 | } // namespace dataflow |
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| 39 | } // namespace clang |
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| 40 | |
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| 41 | #endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H |
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| 42 | |
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