forked from OSchip/llvm-project
571 lines
21 KiB
C++
571 lines
21 KiB
C++
// RetainCountDiagnostics.cpp - Checks for leaks and other issues -*- 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 diagnostics for RetainCountChecker, which implements
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// a reference count checker for Core Foundation and Cocoa on (Mac OS X).
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//
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//===----------------------------------------------------------------------===//
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#include "RetainCountDiagnostics.h"
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#include "RetainCountChecker.h"
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using namespace clang;
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using namespace ento;
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using namespace retaincountchecker;
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static bool isNumericLiteralExpression(const Expr *E) {
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// FIXME: This set of cases was copied from SemaExprObjC.
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return isa<IntegerLiteral>(E) ||
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isa<CharacterLiteral>(E) ||
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isa<FloatingLiteral>(E) ||
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isa<ObjCBoolLiteralExpr>(E) ||
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isa<CXXBoolLiteralExpr>(E);
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}
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std::shared_ptr<PathDiagnosticPiece>
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CFRefReportVisitor::VisitNode(const ExplodedNode *N, const ExplodedNode *PrevN,
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BugReporterContext &BRC, BugReport &BR) {
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// FIXME: We will eventually need to handle non-statement-based events
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// (__attribute__((cleanup))).
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if (!N->getLocation().getAs<StmtPoint>())
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return nullptr;
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// Check if the type state has changed.
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ProgramStateRef PrevSt = PrevN->getState();
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ProgramStateRef CurrSt = N->getState();
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const LocationContext *LCtx = N->getLocationContext();
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const RefVal* CurrT = getRefBinding(CurrSt, Sym);
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if (!CurrT) return nullptr;
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const RefVal &CurrV = *CurrT;
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const RefVal *PrevT = getRefBinding(PrevSt, Sym);
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// Create a string buffer to constain all the useful things we want
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// to tell the user.
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std::string sbuf;
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llvm::raw_string_ostream os(sbuf);
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// This is the allocation site since the previous node had no bindings
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// for this symbol.
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if (!PrevT) {
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const Stmt *S = N->getLocation().castAs<StmtPoint>().getStmt();
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if (isa<ObjCIvarRefExpr>(S) &&
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isSynthesizedAccessor(LCtx->getStackFrame())) {
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S = LCtx->getStackFrame()->getCallSite();
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}
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if (isa<ObjCArrayLiteral>(S)) {
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os << "NSArray literal is an object with a +0 retain count";
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}
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else if (isa<ObjCDictionaryLiteral>(S)) {
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os << "NSDictionary literal is an object with a +0 retain count";
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}
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else if (const ObjCBoxedExpr *BL = dyn_cast<ObjCBoxedExpr>(S)) {
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if (isNumericLiteralExpression(BL->getSubExpr()))
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os << "NSNumber literal is an object with a +0 retain count";
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else {
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const ObjCInterfaceDecl *BoxClass = nullptr;
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if (const ObjCMethodDecl *Method = BL->getBoxingMethod())
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BoxClass = Method->getClassInterface();
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// We should always be able to find the boxing class interface,
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// but consider this future-proofing.
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if (BoxClass)
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os << *BoxClass << " b";
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else
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os << "B";
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os << "oxed expression produces an object with a +0 retain count";
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}
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}
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else if (isa<ObjCIvarRefExpr>(S)) {
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os << "Object loaded from instance variable";
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}
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else {
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if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
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// Get the name of the callee (if it is available).
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SVal X = CurrSt->getSValAsScalarOrLoc(CE->getCallee(), LCtx);
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if (const FunctionDecl *FD = X.getAsFunctionDecl())
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os << "Call to function '" << *FD << '\'';
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else
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os << "function call";
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}
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else {
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assert(isa<ObjCMessageExpr>(S));
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CallEventManager &Mgr = CurrSt->getStateManager().getCallEventManager();
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CallEventRef<ObjCMethodCall> Call
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= Mgr.getObjCMethodCall(cast<ObjCMessageExpr>(S), CurrSt, LCtx);
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switch (Call->getMessageKind()) {
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case OCM_Message:
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os << "Method";
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break;
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case OCM_PropertyAccess:
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os << "Property";
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break;
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case OCM_Subscript:
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os << "Subscript";
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break;
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}
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}
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if (CurrV.getObjKind() == RetEffect::CF) {
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os << " returns a Core Foundation object of type "
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<< Sym->getType().getAsString() << " with a ";
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} else if (CurrV.getObjKind() == RetEffect::OS) {
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os << " returns an OSObject of type "
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<< Sym->getType().getAsString() << " with a ";
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} else if (CurrV.getObjKind() == RetEffect::Generalized) {
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os << " returns an object of type " << Sym->getType().getAsString()
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<< " with a ";
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} else {
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assert (CurrV.getObjKind() == RetEffect::ObjC);
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QualType T = Sym->getType();
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if (!isa<ObjCObjectPointerType>(T)) {
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os << " returns an Objective-C object with a ";
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} else {
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const ObjCObjectPointerType *PT = cast<ObjCObjectPointerType>(T);
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os << " returns an instance of "
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<< PT->getPointeeType().getAsString() << " with a ";
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}
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}
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if (CurrV.isOwned()) {
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os << "+1 retain count";
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} else {
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assert (CurrV.isNotOwned());
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os << "+0 retain count";
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}
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}
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PathDiagnosticLocation Pos(S, BRC.getSourceManager(),
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N->getLocationContext());
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return std::make_shared<PathDiagnosticEventPiece>(Pos, os.str());
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}
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// Gather up the effects that were performed on the object at this
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// program point
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SmallVector<ArgEffect, 2> AEffects;
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const ExplodedNode *OrigNode = BRC.getNodeResolver().getOriginalNode(N);
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if (const RetainSummary *Summ = SummaryLog.lookup(OrigNode)) {
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// We only have summaries attached to nodes after evaluating CallExpr and
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// ObjCMessageExprs.
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const Stmt *S = N->getLocation().castAs<StmtPoint>().getStmt();
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if (const CallExpr *CE = dyn_cast<CallExpr>(S)) {
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// Iterate through the parameter expressions and see if the symbol
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// was ever passed as an argument.
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unsigned i = 0;
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for (CallExpr::const_arg_iterator AI=CE->arg_begin(), AE=CE->arg_end();
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AI!=AE; ++AI, ++i) {
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// Retrieve the value of the argument. Is it the symbol
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// we are interested in?
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if (CurrSt->getSValAsScalarOrLoc(*AI, LCtx).getAsLocSymbol() != Sym)
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continue;
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// We have an argument. Get the effect!
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AEffects.push_back(Summ->getArg(i));
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}
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} else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(S)) {
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if (const Expr *receiver = ME->getInstanceReceiver()) {
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if (CurrSt->getSValAsScalarOrLoc(receiver, LCtx)
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.getAsLocSymbol() == Sym) {
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// The symbol we are tracking is the receiver.
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AEffects.push_back(Summ->getReceiverEffect());
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}
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}
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}
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}
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do {
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// Get the previous type state.
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RefVal PrevV = *PrevT;
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// Specially handle -dealloc.
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if (std::find(AEffects.begin(), AEffects.end(), Dealloc) !=
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AEffects.end()) {
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// Determine if the object's reference count was pushed to zero.
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assert(!PrevV.hasSameState(CurrV) && "The state should have changed.");
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// We may not have transitioned to 'release' if we hit an error.
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// This case is handled elsewhere.
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if (CurrV.getKind() == RefVal::Released) {
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assert(CurrV.getCombinedCounts() == 0);
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os << "Object released by directly sending the '-dealloc' message";
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break;
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}
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}
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// Determine if the typestate has changed.
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if (!PrevV.hasSameState(CurrV))
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switch (CurrV.getKind()) {
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case RefVal::Owned:
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case RefVal::NotOwned:
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if (PrevV.getCount() == CurrV.getCount()) {
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// Did an autorelease message get sent?
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if (PrevV.getAutoreleaseCount() == CurrV.getAutoreleaseCount())
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return nullptr;
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assert(PrevV.getAutoreleaseCount() < CurrV.getAutoreleaseCount());
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os << "Object autoreleased";
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break;
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}
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if (PrevV.getCount() > CurrV.getCount())
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os << "Reference count decremented.";
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else
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os << "Reference count incremented.";
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if (unsigned Count = CurrV.getCount())
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os << " The object now has a +" << Count << " retain count.";
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break;
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case RefVal::Released:
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if (CurrV.getIvarAccessHistory() ==
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RefVal::IvarAccessHistory::ReleasedAfterDirectAccess &&
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CurrV.getIvarAccessHistory() != PrevV.getIvarAccessHistory()) {
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os << "Strong instance variable relinquished. ";
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}
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os << "Object released.";
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break;
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case RefVal::ReturnedOwned:
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// Autoreleases can be applied after marking a node ReturnedOwned.
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if (CurrV.getAutoreleaseCount())
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return nullptr;
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os << "Object returned to caller as an owning reference (single "
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"retain count transferred to caller)";
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break;
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case RefVal::ReturnedNotOwned:
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os << "Object returned to caller with a +0 retain count";
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break;
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default:
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return nullptr;
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}
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} while (0);
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if (os.str().empty())
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return nullptr; // We have nothing to say!
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const Stmt *S = N->getLocation().castAs<StmtPoint>().getStmt();
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PathDiagnosticLocation Pos(S, BRC.getSourceManager(),
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N->getLocationContext());
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auto P = std::make_shared<PathDiagnosticEventPiece>(Pos, os.str());
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// Add the range by scanning the children of the statement for any bindings
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// to Sym.
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for (const Stmt *Child : S->children())
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if (const Expr *Exp = dyn_cast_or_null<Expr>(Child))
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if (CurrSt->getSValAsScalarOrLoc(Exp, LCtx).getAsLocSymbol() == Sym) {
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P->addRange(Exp->getSourceRange());
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break;
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}
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return std::move(P);
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}
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static Optional<std::string> describeRegion(const MemRegion *MR) {
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if (const auto *VR = dyn_cast_or_null<VarRegion>(MR))
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return std::string(VR->getDecl()->getName());
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// Once we support more storage locations for bindings,
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// this would need to be improved.
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return None;
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}
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namespace {
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// Find the first node in the current function context that referred to the
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// tracked symbol and the memory location that value was stored to. Note, the
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// value is only reported if the allocation occurred in the same function as
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// the leak. The function can also return a location context, which should be
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// treated as interesting.
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struct AllocationInfo {
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const ExplodedNode* N;
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const MemRegion *R;
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const LocationContext *InterestingMethodContext;
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AllocationInfo(const ExplodedNode *InN,
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const MemRegion *InR,
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const LocationContext *InInterestingMethodContext) :
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N(InN), R(InR), InterestingMethodContext(InInterestingMethodContext) {}
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};
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} // end anonymous namespace
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static AllocationInfo
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GetAllocationSite(ProgramStateManager& StateMgr, const ExplodedNode *N,
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SymbolRef Sym) {
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const ExplodedNode *AllocationNode = N;
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const ExplodedNode *AllocationNodeInCurrentOrParentContext = N;
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const MemRegion *FirstBinding = nullptr;
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const LocationContext *LeakContext = N->getLocationContext();
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// The location context of the init method called on the leaked object, if
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// available.
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const LocationContext *InitMethodContext = nullptr;
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while (N) {
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ProgramStateRef St = N->getState();
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const LocationContext *NContext = N->getLocationContext();
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if (!getRefBinding(St, Sym))
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break;
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StoreManager::FindUniqueBinding FB(Sym);
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StateMgr.iterBindings(St, FB);
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if (FB) {
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const MemRegion *R = FB.getRegion();
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const VarRegion *VR = R->getBaseRegion()->getAs<VarRegion>();
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// Do not show local variables belonging to a function other than
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// where the error is reported.
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if (!VR || VR->getStackFrame() == LeakContext->getStackFrame())
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FirstBinding = R;
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}
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// AllocationNode is the last node in which the symbol was tracked.
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AllocationNode = N;
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// AllocationNodeInCurrentContext, is the last node in the current or
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// parent context in which the symbol was tracked.
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//
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// Note that the allocation site might be in the parent conext. For example,
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// the case where an allocation happens in a block that captures a reference
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// to it and that reference is overwritten/dropped by another call to
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// the block.
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if (NContext == LeakContext || NContext->isParentOf(LeakContext))
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AllocationNodeInCurrentOrParentContext = N;
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// Find the last init that was called on the given symbol and store the
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// init method's location context.
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if (!InitMethodContext)
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if (Optional<CallEnter> CEP = N->getLocation().getAs<CallEnter>()) {
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const Stmt *CE = CEP->getCallExpr();
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if (const ObjCMessageExpr *ME = dyn_cast_or_null<ObjCMessageExpr>(CE)) {
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const Stmt *RecExpr = ME->getInstanceReceiver();
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if (RecExpr) {
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SVal RecV = St->getSVal(RecExpr, NContext);
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if (ME->getMethodFamily() == OMF_init && RecV.getAsSymbol() == Sym)
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InitMethodContext = CEP->getCalleeContext();
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}
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}
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}
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N = N->pred_empty() ? nullptr : *(N->pred_begin());
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}
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// If we are reporting a leak of the object that was allocated with alloc,
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// mark its init method as interesting.
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const LocationContext *InterestingMethodContext = nullptr;
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if (InitMethodContext) {
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const ProgramPoint AllocPP = AllocationNode->getLocation();
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if (Optional<StmtPoint> SP = AllocPP.getAs<StmtPoint>())
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if (const ObjCMessageExpr *ME = SP->getStmtAs<ObjCMessageExpr>())
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if (ME->getMethodFamily() == OMF_alloc)
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InterestingMethodContext = InitMethodContext;
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}
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// If allocation happened in a function different from the leak node context,
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// do not report the binding.
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assert(N && "Could not find allocation node");
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if (N->getLocationContext() != LeakContext) {
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FirstBinding = nullptr;
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}
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return AllocationInfo(AllocationNodeInCurrentOrParentContext,
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FirstBinding,
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InterestingMethodContext);
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}
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std::shared_ptr<PathDiagnosticPiece>
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CFRefReportVisitor::getEndPath(BugReporterContext &BRC,
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const ExplodedNode *EndN, BugReport &BR) {
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BR.markInteresting(Sym);
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return BugReporterVisitor::getDefaultEndPath(BRC, EndN, BR);
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}
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std::shared_ptr<PathDiagnosticPiece>
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CFRefLeakReportVisitor::getEndPath(BugReporterContext &BRC,
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const ExplodedNode *EndN, BugReport &BR) {
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// Tell the BugReporterContext to report cases when the tracked symbol is
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// assigned to different variables, etc.
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BR.markInteresting(Sym);
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// We are reporting a leak. Walk up the graph to get to the first node where
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// the symbol appeared, and also get the first VarDecl that tracked object
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// is stored to.
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AllocationInfo AllocI =
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GetAllocationSite(BRC.getStateManager(), EndN, Sym);
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const MemRegion* FirstBinding = AllocI.R;
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BR.markInteresting(AllocI.InterestingMethodContext);
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SourceManager& SM = BRC.getSourceManager();
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// Compute an actual location for the leak. Sometimes a leak doesn't
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// occur at an actual statement (e.g., transition between blocks; end
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// of function) so we need to walk the graph and compute a real location.
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const ExplodedNode *LeakN = EndN;
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PathDiagnosticLocation L = PathDiagnosticLocation::createEndOfPath(LeakN, SM);
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std::string sbuf;
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llvm::raw_string_ostream os(sbuf);
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os << "Object leaked: ";
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Optional<std::string> RegionDescription = describeRegion(FirstBinding);
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if (RegionDescription) {
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os << "object allocated and stored into '" << *RegionDescription << '\'';
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}
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else
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os << "allocated object";
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// Get the retain count.
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const RefVal* RV = getRefBinding(EndN->getState(), Sym);
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assert(RV);
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if (RV->getKind() == RefVal::ErrorLeakReturned) {
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// FIXME: Per comments in rdar://6320065, "create" only applies to CF
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// objects. Only "copy", "alloc", "retain" and "new" transfer ownership
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// to the caller for NS objects.
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const Decl *D = &EndN->getCodeDecl();
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os << (isa<ObjCMethodDecl>(D) ? " is returned from a method "
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: " is returned from a function ");
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if (D->hasAttr<CFReturnsNotRetainedAttr>())
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os << "that is annotated as CF_RETURNS_NOT_RETAINED";
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else if (D->hasAttr<NSReturnsNotRetainedAttr>())
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os << "that is annotated as NS_RETURNS_NOT_RETAINED";
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else {
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if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
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if (BRC.getASTContext().getLangOpts().ObjCAutoRefCount) {
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os << "managed by Automatic Reference Counting";
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} else {
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os << "whose name ('" << MD->getSelector().getAsString()
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<< "') does not start with "
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"'copy', 'mutableCopy', 'alloc' or 'new'."
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" This violates the naming convention rules"
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" given in the Memory Management Guide for Cocoa";
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}
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} else {
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const FunctionDecl *FD = cast<FunctionDecl>(D);
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os << "whose name ('" << *FD
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<< "') does not contain 'Copy' or 'Create'. This violates the naming"
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" convention rules given in the Memory Management Guide for Core"
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" Foundation";
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}
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}
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}
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else
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os << " is not referenced later in this execution path and has a retain "
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"count of +" << RV->getCount();
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return std::make_shared<PathDiagnosticEventPiece>(L, os.str());
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}
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void CFRefLeakReport::deriveParamLocation(CheckerContext &Ctx, SymbolRef sym) {
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const SourceManager& SMgr = Ctx.getSourceManager();
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if (!sym->getOriginRegion())
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return;
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auto *Region = dyn_cast<DeclRegion>(sym->getOriginRegion());
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if (Region) {
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const Decl *PDecl = Region->getDecl();
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if (PDecl && isa<ParmVarDecl>(PDecl)) {
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PathDiagnosticLocation ParamLocation = PathDiagnosticLocation::create(PDecl, SMgr);
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Location = ParamLocation;
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UniqueingLocation = ParamLocation;
|
|
UniqueingDecl = Ctx.getLocationContext()->getDecl();
|
|
}
|
|
}
|
|
}
|
|
|
|
void CFRefLeakReport::deriveAllocLocation(CheckerContext &Ctx,SymbolRef sym) {
|
|
// Most bug reports are cached at the location where they occurred.
|
|
// With leaks, we want to unique them by the location where they were
|
|
// allocated, and only report a single path. To do this, we need to find
|
|
// the allocation site of a piece of tracked memory, which we do via a
|
|
// call to GetAllocationSite. This will walk the ExplodedGraph backwards.
|
|
// Note that this is *not* the trimmed graph; we are guaranteed, however,
|
|
// that all ancestor nodes that represent the allocation site have the
|
|
// same SourceLocation.
|
|
const ExplodedNode *AllocNode = nullptr;
|
|
|
|
const SourceManager& SMgr = Ctx.getSourceManager();
|
|
|
|
AllocationInfo AllocI =
|
|
GetAllocationSite(Ctx.getStateManager(), getErrorNode(), sym);
|
|
|
|
AllocNode = AllocI.N;
|
|
AllocBinding = AllocI.R;
|
|
markInteresting(AllocI.InterestingMethodContext);
|
|
|
|
// Get the SourceLocation for the allocation site.
|
|
// FIXME: This will crash the analyzer if an allocation comes from an
|
|
// implicit call (ex: a destructor call).
|
|
// (Currently there are no such allocations in Cocoa, though.)
|
|
AllocStmt = PathDiagnosticLocation::getStmt(AllocNode);
|
|
|
|
if (!AllocStmt) {
|
|
AllocBinding = nullptr;
|
|
return;
|
|
}
|
|
|
|
PathDiagnosticLocation AllocLocation =
|
|
PathDiagnosticLocation::createBegin(AllocStmt, SMgr,
|
|
AllocNode->getLocationContext());
|
|
Location = AllocLocation;
|
|
|
|
// Set uniqieing info, which will be used for unique the bug reports. The
|
|
// leaks should be uniqued on the allocation site.
|
|
UniqueingLocation = AllocLocation;
|
|
UniqueingDecl = AllocNode->getLocationContext()->getDecl();
|
|
}
|
|
|
|
void CFRefLeakReport::createDescription(CheckerContext &Ctx,
|
|
bool IncludeAllocationLine) {
|
|
assert(Location.isValid() && UniqueingDecl && UniqueingLocation.isValid());
|
|
Description.clear();
|
|
llvm::raw_string_ostream os(Description);
|
|
os << "Potential leak of an object";
|
|
|
|
Optional<std::string> RegionDescription = describeRegion(AllocBinding);
|
|
if (RegionDescription) {
|
|
os << " stored into '" << *RegionDescription << '\'';
|
|
if (IncludeAllocationLine) {
|
|
FullSourceLoc SL(AllocStmt->getBeginLoc(), Ctx.getSourceManager());
|
|
os << " (allocated on line " << SL.getSpellingLineNumber() << ")";
|
|
}
|
|
}
|
|
}
|
|
|
|
CFRefLeakReport::CFRefLeakReport(CFRefBug &D, const LangOptions &LOpts,
|
|
const SummaryLogTy &Log,
|
|
ExplodedNode *n, SymbolRef sym,
|
|
CheckerContext &Ctx,
|
|
bool IncludeAllocationLine)
|
|
: CFRefReport(D, LOpts, Log, n, sym, false) {
|
|
|
|
deriveAllocLocation(Ctx, sym);
|
|
if (!AllocBinding)
|
|
deriveParamLocation(Ctx, sym);
|
|
|
|
createDescription(Ctx, IncludeAllocationLine);
|
|
|
|
addVisitor(llvm::make_unique<CFRefLeakReportVisitor>(sym, Log));
|
|
}
|