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// UndefDerefChecker.cpp - Undefined dereference checker ----------*- C++ -*--//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This defines UndefDerefChecker, a builtin check in GRExprEngine that performs
// checks for defined pointers at loads and stores.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/Checkers/UndefDerefChecker.h"
#include "clang/Analysis/PathSensitive/GRExprEngine.h"
#include "clang/Analysis/PathSensitive/BugReporter.h"
using namespace clang;
void *UndefDerefChecker::getTag() {
static int x = 0;
return &x;
}
ExplodedNode *UndefDerefChecker::CheckLocation(const Stmt *S,
ExplodedNode *Pred,
const GRState *state, SVal V,
GRExprEngine &Eng) {
GRStmtNodeBuilder &Builder = Eng.getBuilder();
BugReporter &BR = Eng.getBugReporter();
if (V.isUndef()) {
ExplodedNode *N = Builder.generateNode(S, state, Pred,
ProgramPoint::PostUndefLocationCheckFailedKind);
if (N) {
N->markAsSink();
if (!BT)
BT = new BuiltinBug(0, "Undefined dereference",
"Dereference of undefined pointer value");
EnhancedBugReport *R =
new EnhancedBugReport(*BT, BT->getDescription().c_str(), N);
R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue,
bugreporter::GetDerefExpr(N));
BR.EmitReport(R);
}
return 0;
}
return Pred;
}
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