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//===-- NoopAnalysis.h ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a NoopAnalysis class that is used by dataflow analysis
// tests.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_UNITTESTS_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H
#define LLVM_CLANG_UNITTESTS_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H
#include "clang/AST/ASTContext.h"
#include "clang/AST/Stmt.h"
#include "clang/Analysis/FlowSensitive/DataflowAnalysis.h"
#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
#include "clang/Analysis/FlowSensitive/DataflowLattice.h"
#include <ostream>
namespace clang {
namespace dataflow {
class NoopLattice {
public:
bool operator==(const NoopLattice &) const { return true; }
LatticeJoinEffect join(const NoopLattice &) {
return LatticeJoinEffect::Unchanged;
}
};
inline std::ostream &operator<<(std::ostream &OS, const NoopLattice &) {
return OS << "noop";
}
class NoopAnalysis : public DataflowAnalysis<NoopAnalysis, NoopLattice> {
public:
/// `ApplyBuiltinTransfer` controls whether to run the built-in transfer
/// functions that model memory during the analysis. Their results are not
/// used by `NoopAnalysis`, but tests that need to inspect the environment
/// should enable them.
NoopAnalysis(ASTContext &Context, bool ApplyBuiltinTransfer)
: DataflowAnalysis<NoopAnalysis, NoopLattice>(Context,
ApplyBuiltinTransfer) {}
static NoopLattice initialElement() { return {}; }
void transfer(const Stmt *S, NoopLattice &E, Environment &Env) {}
};
} // namespace dataflow
} // namespace clang
#endif // LLVM_CLANG_UNITTESTS_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H
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