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//=== UndefSizedVLAChecker.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 UndefSizedVLAChecker, a builtin check in GRExprEngine that
// performs checks for declaration of VLA of undefined size.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/Checkers/UndefSizedVLAChecker.h"
#include "clang/Analysis/PathSensitive/GRExprEngine.h"
#include "clang/Analysis/PathSensitive/BugReporter.h"
using namespace clang;
void *UndefSizedVLAChecker::getTag() {
static int x = 0;
return &x;
}
ExplodedNode *UndefSizedVLAChecker::CheckType(QualType T, ExplodedNode *Pred,
const GRState *state,
Stmt *S, GRExprEngine &Eng) {
GRStmtNodeBuilder &Builder = Eng.getBuilder();
BugReporter &BR = Eng.getBugReporter();
if (VariableArrayType* VLA = dyn_cast<VariableArrayType>(T)) {
// FIXME: Handle multi-dimensional VLAs.
Expr* SE = VLA->getSizeExpr();
SVal Size_untested = state->getSVal(SE);
if (Size_untested.isUndef()) {
if (ExplodedNode* N = Builder.generateNode(S, state, Pred)) {
N->markAsSink();
if (!BT)
BT = new BugType("Declare variable-length array (VLA) of undefined "
"size", "Logic error");
EnhancedBugReport *R =
new EnhancedBugReport(*BT, BT->getName().c_str(), N);
R->addRange(SE->getSourceRange());
R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, SE);
BR.EmitReport(R);
}
return 0;
}
}
return Pred;
}
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