diff options
Diffstat (limited to 'lib/Checker/ArrayBoundChecker.cpp')
-rw-r--r-- | lib/Checker/ArrayBoundChecker.cpp | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/lib/Checker/ArrayBoundChecker.cpp b/lib/Checker/ArrayBoundChecker.cpp deleted file mode 100644 index a36e13e4fe..0000000000 --- a/lib/Checker/ArrayBoundChecker.cpp +++ /dev/null @@ -1,90 +0,0 @@ -//== ArrayBoundChecker.cpp ------------------------------*- C++ -*--==// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines ArrayBoundChecker, which is a path-sensitive check -// which looks for an out-of-bound array element access. -// -//===----------------------------------------------------------------------===// - -#include "GRExprEngineInternalChecks.h" -#include "clang/GR/BugReporter/BugType.h" -#include "clang/GR/PathSensitive/CheckerVisitor.h" -#include "clang/GR/PathSensitive/GRExprEngine.h" - -using namespace clang; - -namespace { -class ArrayBoundChecker : - public CheckerVisitor<ArrayBoundChecker> { - BuiltinBug *BT; -public: - ArrayBoundChecker() : BT(0) {} - static void *getTag() { static int x = 0; return &x; } - void visitLocation(CheckerContext &C, const Stmt *S, SVal l); -}; -} - -void clang::RegisterArrayBoundChecker(GRExprEngine &Eng) { - Eng.registerCheck(new ArrayBoundChecker()); -} - -void ArrayBoundChecker::visitLocation(CheckerContext &C, const Stmt *S, SVal l){ - // Check for out of bound array element access. - const MemRegion *R = l.getAsRegion(); - if (!R) - return; - - const ElementRegion *ER = dyn_cast<ElementRegion>(R); - if (!ER) - return; - - // Get the index of the accessed element. - DefinedOrUnknownSVal Idx = cast<DefinedOrUnknownSVal>(ER->getIndex()); - - // Zero index is always in bound, this also passes ElementRegions created for - // pointer casts. - if (Idx.isZeroConstant()) - return; - - const GRState *state = C.getState(); - - // Get the size of the array. - DefinedOrUnknownSVal NumElements - = C.getStoreManager().getSizeInElements(state, ER->getSuperRegion(), - ER->getValueType()); - - const GRState *StInBound = state->assumeInBound(Idx, NumElements, true); - const GRState *StOutBound = state->assumeInBound(Idx, NumElements, false); - if (StOutBound && !StInBound) { - ExplodedNode *N = C.generateSink(StOutBound); - if (!N) - return; - - if (!BT) - BT = new BuiltinBug("Out-of-bound array access", - "Access out-of-bound array element (buffer overflow)"); - - // FIXME: It would be nice to eventually make this diagnostic more clear, - // e.g., by referencing the original declaration or by saying *why* this - // reference is outside the range. - - // Generate a report for this bug. - RangedBugReport *report = - new RangedBugReport(*BT, BT->getDescription(), N); - - report->addRange(S->getSourceRange()); - C.EmitReport(report); - return; - } - - // Array bound check succeeded. From this point forward the array bound - // should always succeed. - assert(StInBound); - C.addTransition(StInBound); -} |