forked from OSchip/llvm-project
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
//== ReturnUndefChecker.cpp -------------------------------------*- 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 file defines ReturnUndefChecker, which is a path-sensitive
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// check which looks for undefined or garbage values being returned to the
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// caller.
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//
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//===----------------------------------------------------------------------===//
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#include "GRExprEngineInternalChecks.h"
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#include "clang/Analysis/PathSensitive/GRExprEngine.h"
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#include "clang/Analysis/PathSensitive/BugReporter.h"
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#include "clang/Analysis/PathSensitive/CheckerVisitor.h"
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#include "llvm/ADT/SmallString.h"
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using namespace clang;
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namespace {
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class VISIBILITY_HIDDEN ReturnUndefChecker :
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public CheckerVisitor<ReturnUndefChecker> {
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BuiltinBug *BT;
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public:
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ReturnUndefChecker() : BT(0) {}
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static void *getTag();
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void PreVisitReturnStmt(CheckerContext &C, const ReturnStmt *RS);
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};
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}
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void clang::RegisterReturnUndefChecker(GRExprEngine &Eng) {
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Eng.registerCheck(new ReturnUndefChecker());
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}
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void *ReturnUndefChecker::getTag() {
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static int x = 0; return &x;
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}
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void ReturnUndefChecker::PreVisitReturnStmt(CheckerContext &C,
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const ReturnStmt *RS) {
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const Expr *RetE = RS->getRetValue();
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if (!RetE)
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return;
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if (!C.getState()->getSVal(RetE).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("Garbage return value",
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"Undefined or garbage value returned to caller");
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EnhancedBugReport *report =
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new EnhancedBugReport(*BT, BT->getDescription(), N);
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report->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, RetE);
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C.EmitReport(report);
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}
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