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1 //== ConstraintManager.cpp - Constraints on symbolic values -----*- C++ -*--==//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file defined the interface to manage constraints on symbolic values.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
15
16 using namespace clang;
17 using namespace ento;
18
19 ConstraintManager::~ConstraintManager() {}
20
21 static DefinedSVal getLocFromSymbol(const ProgramStateRef &State,
22                                     SymbolRef Sym) {
23   const MemRegion *R = State->getStateManager().getRegionManager()
24                                                .getSymbolicRegion(Sym);
25   return loc::MemRegionVal(R);
26 }
27
28 ConditionTruthVal ConstraintManager::checkNull(ProgramStateRef State,
29                                                SymbolRef Sym) {  
30   QualType Ty = Sym->getType();
31   DefinedSVal V = Loc::isLocType(Ty) ? getLocFromSymbol(State, Sym)
32                                      : nonloc::SymbolVal(Sym);
33   const ProgramStatePair &P = assumeDual(State, V);
34   if (P.first && !P.second)
35     return ConditionTruthVal(false);
36   if (!P.first && P.second)
37     return ConditionTruthVal(true);
38   return ConditionTruthVal();
39 }