| 1 | //===- ConstraintManager.cpp - Constraints on symbolic values. ------------===// |
|---|---|
| 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 defined the interface to manage constraints on symbolic values. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h" |
| 14 | #include "clang/AST/Type.h" |
| 15 | #include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h" |
| 16 | #include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h" |
| 17 | #include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h" |
| 18 | #include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h" |
| 19 | |
| 20 | using namespace clang; |
| 21 | using namespace ento; |
| 22 | |
| 23 | ConstraintManager::~ConstraintManager() = default; |
| 24 | |
| 25 | static DefinedSVal getLocFromSymbol(const ProgramStateRef &State, |
| 26 | SymbolRef Sym) { |
| 27 | const MemRegion *R = |
| 28 | State->getStateManager().getRegionManager().getSymbolicRegion(Sym); |
| 29 | return loc::MemRegionVal(R); |
| 30 | } |
| 31 | |
| 32 | ConditionTruthVal ConstraintManager::checkNull(ProgramStateRef State, |
| 33 | SymbolRef Sym) { |
| 34 | QualType Ty = Sym->getType(); |
| 35 | DefinedSVal V = Loc::isLocType(Ty) ? getLocFromSymbol(State, Sym) |
| 36 | : nonloc::SymbolVal(Sym); |
| 37 | const ProgramStatePair &P = assumeDual(State, V); |
| 38 | if (P.first && !P.second) |
| 39 | return ConditionTruthVal(false); |
| 40 | if (!P.first && P.second) |
| 41 | return ConditionTruthVal(true); |
| 42 | return {}; |
| 43 | } |
| 44 |