53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
//===-- NoopLattice.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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//
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// This file defines the lattice with exactly one element.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H
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#define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H
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#include "clang/Analysis/FlowSensitive/DataflowLattice.h"
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#include "clang/Support/Compiler.h"
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#include "llvm/ADT/Any.h"
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#include <ostream>
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namespace clang {
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namespace dataflow {
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/// Trivial lattice for dataflow analysis with exactly one element.
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///
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/// Useful for analyses that only need the Environment and nothing more.
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class NoopLattice {
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public:
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bool operator==(const NoopLattice &Other) const { return true; }
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LatticeJoinEffect join(const NoopLattice &Other) {
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return LatticeJoinEffect::Unchanged;
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}
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};
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inline std::ostream &operator<<(std::ostream &OS, const NoopLattice &) {
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return OS << "noop";
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}
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} // namespace dataflow
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} // namespace clang
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namespace llvm {
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// This needs to be exported for ClangAnalysisFlowSensitiveTests so any_cast
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// uses the correct address of Any::TypeId from the clang shared library instead
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// of creating one in the test executable. when building with
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// CLANG_LINK_CLANG_DYLIB
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extern template struct CLANG_TEMPLATE_ABI
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Any::TypeId<clang::dataflow::NoopLattice>;
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} // namespace llvm
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#endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOP_LATTICE_H
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