1 //===- WatchedLiteralsSolver.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 //
9 //  This file defines a SAT solver implementation that can be used by dataflow
10 //  analyses.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_WATCHEDLITERALSSOLVER_H
15 #define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_WATCHEDLITERALSSOLVER_H
16 
17 #include "clang/Analysis/FlowSensitive/Solver.h"
18 #include "clang/Analysis/FlowSensitive/Value.h"
19 #include "llvm/ADT/DenseSet.h"
20 
21 namespace clang {
22 namespace dataflow {
23 
24 /// A SAT solver that is an implementation of Algorithm D from Knuth's The Art
25 /// of Computer Programming Volume 4: Satisfiability, Fascicle 6. It is based on
26 /// the Davis-Putnam-Logemann-Loveland (DPLL) algorithm, keeps references to a
27 /// single "watched" literal per clause, and uses a set of "active" variables
28 /// for unit propagation.
29 class WatchedLiteralsSolver : public Solver {
30 public:
31   Result solve(llvm::DenseSet<BoolValue *> Vals) override;
32 };
33 
34 } // namespace dataflow
35 } // namespace clang
36 
37 #endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_WATCHEDLITERALSSOLVER_H
38