forked from OSchip/llvm-project
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
//===--- UndefinedAssignmentChecker.h ---------------------------*- C++ -*--==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines UndefinedAssginmentChecker, a builtin check in GRExprEngine that
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// checks for assigning undefined values.
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//
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//===----------------------------------------------------------------------===//
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#include "GRExprEngineInternalChecks.h"
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#include "clang/Checker/PathSensitive/CheckerVisitor.h"
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#include "clang/Checker/BugReporter/BugReporter.h"
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using namespace clang;
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namespace {
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class UndefinedAssignmentChecker
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: public CheckerVisitor<UndefinedAssignmentChecker> {
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BugType *BT;
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public:
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UndefinedAssignmentChecker() : BT(0) {}
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static void *getTag();
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virtual void PreVisitBind(CheckerContext &C, const Stmt *AssignE,
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const Stmt *StoreE, SVal location,
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SVal val);
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};
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}
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void clang::RegisterUndefinedAssignmentChecker(GRExprEngine &Eng){
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Eng.registerCheck(new UndefinedAssignmentChecker());
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}
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void *UndefinedAssignmentChecker::getTag() {
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static int x = 0;
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return &x;
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}
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void UndefinedAssignmentChecker::PreVisitBind(CheckerContext &C,
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const Stmt *AssignE,
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const Stmt *StoreE,
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SVal location,
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SVal val) {
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if (!val.isUndef())
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return;
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ExplodedNode *N = C.GenerateSink();
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if (!N)
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return;
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if (!BT)
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BT = new BuiltinBug("Assigned value is garbage or undefined");
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// Generate a report for this bug.
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EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName(), N);
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if (AssignE) {
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const Expr *ex = 0;
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if (const BinaryOperator *B = dyn_cast<BinaryOperator>(AssignE))
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ex = B->getRHS();
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else if (const DeclStmt *DS = dyn_cast<DeclStmt>(AssignE)) {
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const VarDecl* VD = dyn_cast<VarDecl>(DS->getSingleDecl());
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ex = VD->getInit();
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}
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if (ex) {
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R->addRange(ex->getSourceRange());
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R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, ex);
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}
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}
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C.EmitReport(R);
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}
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