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