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diff --git a/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp b/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
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-//===--- CallAndMessageChecker.cpp ------------------------------*- C++ -*--==//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This defines CallAndMessageChecker, a builtin checker that checks for various
-// errors of call and objc message expressions.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
-#include "clang/AST/ParentMap.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
-#include "clang/StaticAnalyzer/Core/Checker.h"
-#include "clang/StaticAnalyzer/Core/CheckerManager.h"
-#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
-#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace clang;
-using namespace ento;
-
-namespace {
-
-struct ChecksFilter {
- DefaultBool Check_CallAndMessageUnInitRefArg;
- DefaultBool Check_CallAndMessageChecker;
-
- CheckName CheckName_CallAndMessageUnInitRefArg;
- CheckName CheckName_CallAndMessageChecker;
-};
-
-class CallAndMessageChecker
- : public Checker< check::PreStmt<CallExpr>,
- check::PreStmt<CXXDeleteExpr>,
- check::PreObjCMessage,
- check::ObjCMessageNil,
- check::PreCall > {
- mutable std::unique_ptr<BugType> BT_call_null;
- mutable std::unique_ptr<BugType> BT_call_undef;
- mutable std::unique_ptr<BugType> BT_cxx_call_null;
- mutable std::unique_ptr<BugType> BT_cxx_call_undef;
- mutable std::unique_ptr<BugType> BT_call_arg;
- mutable std::unique_ptr<BugType> BT_cxx_delete_undef;
- mutable std::unique_ptr<BugType> BT_msg_undef;
- mutable std::unique_ptr<BugType> BT_objc_prop_undef;
- mutable std::unique_ptr<BugType> BT_objc_subscript_undef;
- mutable std::unique_ptr<BugType> BT_msg_arg;
- mutable std::unique_ptr<BugType> BT_msg_ret;
- mutable std::unique_ptr<BugType> BT_call_few_args;
-
-public:
- ChecksFilter Filter;
-
- void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;
- void checkPreStmt(const CXXDeleteExpr *DE, CheckerContext &C) const;
- void checkPreObjCMessage(const ObjCMethodCall &msg, CheckerContext &C) const;
-
- /// Fill in the return value that results from messaging nil based on the
- /// return type and architecture and diagnose if the return value will be
- /// garbage.
- void checkObjCMessageNil(const ObjCMethodCall &msg, CheckerContext &C) const;
-
- void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
-
-private:
- bool PreVisitProcessArg(CheckerContext &C, SVal V, SourceRange ArgRange,
- const Expr *ArgEx, int ArgumentNumber,
- bool CheckUninitFields, const CallEvent &Call,
- std::unique_ptr<BugType> &BT,
- const ParmVarDecl *ParamDecl) const;
-
- static void emitBadCall(BugType *BT, CheckerContext &C, const Expr *BadE);
- void emitNilReceiverBug(CheckerContext &C, const ObjCMethodCall &msg,
- ExplodedNode *N) const;
-
- void HandleNilReceiver(CheckerContext &C,
- ProgramStateRef state,
- const ObjCMethodCall &msg) const;
-
- void LazyInit_BT(const char *desc, std::unique_ptr<BugType> &BT) const {
- if (!BT)
- BT.reset(new BuiltinBug(this, desc));
- }
- bool uninitRefOrPointer(CheckerContext &C, const SVal &V,
- SourceRange ArgRange, const Expr *ArgEx,
- std::unique_ptr<BugType> &BT,
- const ParmVarDecl *ParamDecl, const char *BD,
- int ArgumentNumber) const;
-};
-} // end anonymous namespace
-
-void CallAndMessageChecker::emitBadCall(BugType *BT, CheckerContext &C,
- const Expr *BadE) {
- ExplodedNode *N = C.generateErrorNode();
- if (!N)
- return;
-
- auto R = llvm::make_unique<BugReport>(*BT, BT->getName(), N);
- if (BadE) {
- R->addRange(BadE->getSourceRange());
- if (BadE->isGLValue())
- BadE = bugreporter::getDerefExpr(BadE);
- bugreporter::trackExpressionValue(N, BadE, *R);
- }
- C.emitReport(std::move(R));
-}
-
-static void describeUninitializedArgumentInCall(const CallEvent &Call,
- int ArgumentNumber,
- llvm::raw_svector_ostream &Os) {
- switch (Call.getKind()) {
- case CE_ObjCMessage: {
- const ObjCMethodCall &Msg = cast<ObjCMethodCall>(Call);
- switch (Msg.getMessageKind()) {
- case OCM_Message:
- Os << (ArgumentNumber + 1) << llvm::getOrdinalSuffix(ArgumentNumber + 1)
- << " argument in message expression is an uninitialized value";
- return;
- case OCM_PropertyAccess:
- assert(Msg.isSetter() && "Getters have no args");
- Os << "Argument for property setter is an uninitialized value";
- return;
- case OCM_Subscript:
- if (Msg.isSetter() && (ArgumentNumber == 0))
- Os << "Argument for subscript setter is an uninitialized value";
- else
- Os << "Subscript index is an uninitialized value";
- return;
- }
- llvm_unreachable("Unknown message kind.");
- }
- case CE_Block:
- Os << (ArgumentNumber + 1) << llvm::getOrdinalSuffix(ArgumentNumber + 1)
- << " block call argument is an uninitialized value";
- return;
- default:
- Os << (ArgumentNumber + 1) << llvm::getOrdinalSuffix(ArgumentNumber + 1)
- << " function call argument is an uninitialized value";
- return;
- }
-}
-
-bool CallAndMessageChecker::uninitRefOrPointer(
- CheckerContext &C, const SVal &V, SourceRange ArgRange, const Expr *ArgEx,
- std::unique_ptr<BugType> &BT, const ParmVarDecl *ParamDecl, const char *BD,
- int ArgumentNumber) const {
- if (!Filter.Check_CallAndMessageUnInitRefArg)
- return false;
-
- // No parameter declaration available, i.e. variadic function argument.
- if(!ParamDecl)
- return false;
-
- // If parameter is declared as pointer to const in function declaration,
- // then check if corresponding argument in function call is
- // pointing to undefined symbol value (uninitialized memory).
- SmallString<200> Buf;
- llvm::raw_svector_ostream Os(Buf);
-
- if (ParamDecl->getType()->isPointerType()) {
- Os << (ArgumentNumber + 1) << llvm::getOrdinalSuffix(ArgumentNumber + 1)
- << " function call argument is a pointer to uninitialized value";
- } else if (ParamDecl->getType()->isReferenceType()) {
- Os << (ArgumentNumber + 1) << llvm::getOrdinalSuffix(ArgumentNumber + 1)
- << " function call argument is an uninitialized value";
- } else
- return false;
-
- if(!ParamDecl->getType()->getPointeeType().isConstQualified())
- return false;
-
- if (const MemRegion *SValMemRegion = V.getAsRegion()) {
- const ProgramStateRef State = C.getState();
- const SVal PSV = State->getSVal(SValMemRegion, C.getASTContext().CharTy);
- if (PSV.isUndef()) {
- if (ExplodedNode *N = C.generateErrorNode()) {
- LazyInit_BT(BD, BT);
- auto R = llvm::make_unique<BugReport>(*BT, Os.str(), N);
- R->addRange(ArgRange);
- if (ArgEx)
- bugreporter::trackExpressionValue(N, ArgEx, *R);
-
- C.emitReport(std::move(R));
- }
- return true;
- }
- }
- return false;
-}
-
-namespace {
-class FindUninitializedField {
-public:
- SmallVector<const FieldDecl *, 10> FieldChain;
-
-private:
- StoreManager &StoreMgr;
- MemRegionManager &MrMgr;
- Store store;
-
-public:
- FindUninitializedField(StoreManager &storeMgr, MemRegionManager &mrMgr,
- Store s)
- : StoreMgr(storeMgr), MrMgr(mrMgr), store(s) {}
-
- bool Find(const TypedValueRegion *R) {
- QualType T = R->getValueType();
- if (const RecordType *RT = T->getAsStructureType()) {
- const RecordDecl *RD = RT->getDecl()->getDefinition();
- assert(RD && "Referred record has no definition");
- for (const auto *I : RD->fields()) {
- const FieldRegion *FR = MrMgr.getFieldRegion(I, R);
- FieldChain.push_back(I);
- T = I->getType();
- if (T->getAsStructureType()) {
- if (Find(FR))
- return true;
- } else {
- const SVal &V = StoreMgr.getBinding(store, loc::MemRegionVal(FR));
- if (V.isUndef())
- return true;
- }
- FieldChain.pop_back();
- }
- }
-
- return false;
- }
-};
-} // namespace
-
-bool CallAndMessageChecker::PreVisitProcessArg(CheckerContext &C,
- SVal V,
- SourceRange ArgRange,
- const Expr *ArgEx,
- int ArgumentNumber,
- bool CheckUninitFields,
- const CallEvent &Call,
- std::unique_ptr<BugType> &BT,
- const ParmVarDecl *ParamDecl
- ) const {
- const char *BD = "Uninitialized argument value";
-
- if (uninitRefOrPointer(C, V, ArgRange, ArgEx, BT, ParamDecl, BD,
- ArgumentNumber))
- return true;
-
- if (V.isUndef()) {
- if (ExplodedNode *N = C.generateErrorNode()) {
- LazyInit_BT(BD, BT);
- // Generate a report for this bug.
- SmallString<200> Buf;
- llvm::raw_svector_ostream Os(Buf);
- describeUninitializedArgumentInCall(Call, ArgumentNumber, Os);
- auto R = llvm::make_unique<BugReport>(*BT, Os.str(), N);
-
- R->addRange(ArgRange);
- if (ArgEx)
- bugreporter::trackExpressionValue(N, ArgEx, *R);
- C.emitReport(std::move(R));
- }
- return true;
- }
-
- if (!CheckUninitFields)
- return false;
-
- if (auto LV = V.getAs<nonloc::LazyCompoundVal>()) {
- const LazyCompoundValData *D = LV->getCVData();
- FindUninitializedField F(C.getState()->getStateManager().getStoreManager(),
- C.getSValBuilder().getRegionManager(),
- D->getStore());
-
- if (F.Find(D->getRegion())) {
- if (ExplodedNode *N = C.generateErrorNode()) {
- LazyInit_BT(BD, BT);
- SmallString<512> Str;
- llvm::raw_svector_ostream os(Str);
- os << "Passed-by-value struct argument contains uninitialized data";
-
- if (F.FieldChain.size() == 1)
- os << " (e.g., field: '" << *F.FieldChain[0] << "')";
- else {
- os << " (e.g., via the field chain: '";
- bool first = true;
- for (SmallVectorImpl<const FieldDecl *>::iterator
- DI = F.FieldChain.begin(), DE = F.FieldChain.end(); DI!=DE;++DI){
- if (first)
- first = false;
- else
- os << '.';
- os << **DI;
- }
- os << "')";
- }
-
- // Generate a report for this bug.
- auto R = llvm::make_unique<BugReport>(*BT, os.str(), N);
- R->addRange(ArgRange);
-
- if (ArgEx)
- bugreporter::trackExpressionValue(N, ArgEx, *R);
- // FIXME: enhance track back for uninitialized value for arbitrary
- // memregions
- C.emitReport(std::move(R));
- }
- return true;
- }
- }
-
- return false;
-}
-
-void CallAndMessageChecker::checkPreStmt(const CallExpr *CE,
- CheckerContext &C) const{
-
- const Expr *Callee = CE->getCallee()->IgnoreParens();
- ProgramStateRef State = C.getState();
- const LocationContext *LCtx = C.getLocationContext();
- SVal L = State->getSVal(Callee, LCtx);
-
- if (L.isUndef()) {
- if (!BT_call_undef)
- BT_call_undef.reset(new BuiltinBug(
- this, "Called function pointer is an uninitialized pointer value"));
- emitBadCall(BT_call_undef.get(), C, Callee);
- return;
- }
-
- ProgramStateRef StNonNull, StNull;
- std::tie(StNonNull, StNull) = State->assume(L.castAs<DefinedOrUnknownSVal>());
-
- if (StNull && !StNonNull) {
- if (!BT_call_null)
- BT_call_null.reset(new BuiltinBug(
- this, "Called function pointer is null (null dereference)"));
- emitBadCall(BT_call_null.get(), C, Callee);
- return;
- }
-
- C.addTransition(StNonNull);
-}
-
-void CallAndMessageChecker::checkPreStmt(const CXXDeleteExpr *DE,
- CheckerContext &C) const {
-
- SVal Arg = C.getSVal(DE->getArgument());
- if (Arg.isUndef()) {
- StringRef Desc;
- ExplodedNode *N = C.generateErrorNode();
- if (!N)
- return;
- if (!BT_cxx_delete_undef)
- BT_cxx_delete_undef.reset(
- new BuiltinBug(this, "Uninitialized argument value"));
- if (DE->isArrayFormAsWritten())
- Desc = "Argument to 'delete[]' is uninitialized";
- else
- Desc = "Argument to 'delete' is uninitialized";
- BugType *BT = BT_cxx_delete_undef.get();
- auto R = llvm::make_unique<BugReport>(*BT, Desc, N);
- bugreporter::trackExpressionValue(N, DE, *R);
- C.emitReport(std::move(R));
- return;
- }
-}
-
-void CallAndMessageChecker::checkPreCall(const CallEvent &Call,
- CheckerContext &C) const {
- ProgramStateRef State = C.getState();
-
- // If this is a call to a C++ method, check if the callee is null or
- // undefined.
- if (const CXXInstanceCall *CC = dyn_cast<CXXInstanceCall>(&Call)) {
- SVal V = CC->getCXXThisVal();
- if (V.isUndef()) {
- if (!BT_cxx_call_undef)
- BT_cxx_call_undef.reset(
- new BuiltinBug(this, "Called C++ object pointer is uninitialized"));
- emitBadCall(BT_cxx_call_undef.get(), C, CC->getCXXThisExpr());
- return;
- }
-
- ProgramStateRef StNonNull, StNull;
- std::tie(StNonNull, StNull) =
- State->assume(V.castAs<DefinedOrUnknownSVal>());
-
- if (StNull && !StNonNull) {
- if (!BT_cxx_call_null)
- BT_cxx_call_null.reset(
- new BuiltinBug(this, "Called C++ object pointer is null"));
- emitBadCall(BT_cxx_call_null.get(), C, CC->getCXXThisExpr());
- return;
- }
-
- State = StNonNull;
- }
-
- const Decl *D = Call.getDecl();
- if (D && (isa<FunctionDecl>(D) || isa<BlockDecl>(D))) {
- // If we have a function or block declaration, we can make sure we pass
- // enough parameters.
- unsigned Params = Call.parameters().size();
- if (Call.getNumArgs() < Params) {
- ExplodedNode *N = C.generateErrorNode();
- if (!N)
- return;
-
- LazyInit_BT("Function call with too few arguments", BT_call_few_args);
-
- SmallString<512> Str;
- llvm::raw_svector_ostream os(Str);
- if (isa<FunctionDecl>(D)) {
- os << "Function ";
- } else {
- assert(isa<BlockDecl>(D));
- os << "Block ";
- }
- os << "taking " << Params << " argument"
- << (Params == 1 ? "" : "s") << " is called with fewer ("
- << Call.getNumArgs() << ")";
-
- C.emitReport(
- llvm::make_unique<BugReport>(*BT_call_few_args, os.str(), N));
- }
- }
-
- // Don't check for uninitialized field values in arguments if the
- // caller has a body that is available and we have the chance to inline it.
- // This is a hack, but is a reasonable compromise betweens sometimes warning
- // and sometimes not depending on if we decide to inline a function.
- const bool checkUninitFields =
- !(C.getAnalysisManager().shouldInlineCall() && (D && D->getBody()));
-
- std::unique_ptr<BugType> *BT;
- if (isa<ObjCMethodCall>(Call))
- BT = &BT_msg_arg;
- else
- BT = &BT_call_arg;
-
- const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
- for (unsigned i = 0, e = Call.getNumArgs(); i != e; ++i) {
- const ParmVarDecl *ParamDecl = nullptr;
- if(FD && i < FD->getNumParams())
- ParamDecl = FD->getParamDecl(i);
- if (PreVisitProcessArg(C, Call.getArgSVal(i), Call.getArgSourceRange(i),
- Call.getArgExpr(i), i,
- checkUninitFields, Call, *BT, ParamDecl))
- return;
- }
-
- // If we make it here, record our assumptions about the callee.
- C.addTransition(State);
-}
-
-void CallAndMessageChecker::checkPreObjCMessage(const ObjCMethodCall &msg,
- CheckerContext &C) const {
- SVal recVal = msg.getReceiverSVal();
- if (recVal.isUndef()) {
- if (ExplodedNode *N = C.generateErrorNode()) {
- BugType *BT = nullptr;
- switch (msg.getMessageKind()) {
- case OCM_Message:
- if (!BT_msg_undef)
- BT_msg_undef.reset(new BuiltinBug(this,
- "Receiver in message expression "
- "is an uninitialized value"));
- BT = BT_msg_undef.get();
- break;
- case OCM_PropertyAccess:
- if (!BT_objc_prop_undef)
- BT_objc_prop_undef.reset(new BuiltinBug(
- this, "Property access on an uninitialized object pointer"));
- BT = BT_objc_prop_undef.get();
- break;
- case OCM_Subscript:
- if (!BT_objc_subscript_undef)
- BT_objc_subscript_undef.reset(new BuiltinBug(
- this, "Subscript access on an uninitialized object pointer"));
- BT = BT_objc_subscript_undef.get();
- break;
- }
- assert(BT && "Unknown message kind.");
-
- auto R = llvm::make_unique<BugReport>(*BT, BT->getName(), N);
- const ObjCMessageExpr *ME = msg.getOriginExpr();
- R->addRange(ME->getReceiverRange());
-
- // FIXME: getTrackNullOrUndefValueVisitor can't handle "super" yet.
- if (const Expr *ReceiverE = ME->getInstanceReceiver())
- bugreporter::trackExpressionValue(N, ReceiverE, *R);
- C.emitReport(std::move(R));
- }
- return;
- }
-}
-
-void CallAndMessageChecker::checkObjCMessageNil(const ObjCMethodCall &msg,
- CheckerContext &C) const {
- HandleNilReceiver(C, C.getState(), msg);
-}
-
-void CallAndMessageChecker::emitNilReceiverBug(CheckerContext &C,
- const ObjCMethodCall &msg,
- ExplodedNode *N) const {
-
- if (!BT_msg_ret)
- BT_msg_ret.reset(
- new BuiltinBug(this, "Receiver in message expression is 'nil'"));
-
- const ObjCMessageExpr *ME = msg.getOriginExpr();
-
- QualType ResTy = msg.getResultType();
-
- SmallString<200> buf;
- llvm::raw_svector_ostream os(buf);
- os << "The receiver of message '";
- ME->getSelector().print(os);
- os << "' is nil";
- if (ResTy->isReferenceType()) {
- os << ", which results in forming a null reference";
- } else {
- os << " and returns a value of type '";
- msg.getResultType().print(os, C.getLangOpts());
- os << "' that will be garbage";
- }
-
- auto report = llvm::make_unique<BugReport>(*BT_msg_ret, os.str(), N);
- report->addRange(ME->getReceiverRange());
- // FIXME: This won't track "self" in messages to super.
- if (const Expr *receiver = ME->getInstanceReceiver()) {
- bugreporter::trackExpressionValue(N, receiver, *report);
- }
- C.emitReport(std::move(report));
-}
-
-static bool supportsNilWithFloatRet(const llvm::Triple &triple) {
- return (triple.getVendor() == llvm::Triple::Apple &&
- (triple.isiOS() || triple.isWatchOS() ||
- !triple.isMacOSXVersionLT(10,5)));
-}
-
-void CallAndMessageChecker::HandleNilReceiver(CheckerContext &C,
- ProgramStateRef state,
- const ObjCMethodCall &Msg) const {
- ASTContext &Ctx = C.getASTContext();
- static CheckerProgramPointTag Tag(this, "NilReceiver");
-
- // Check the return type of the message expression. A message to nil will
- // return different values depending on the return type and the architecture.
- QualType RetTy = Msg.getResultType();
- CanQualType CanRetTy = Ctx.getCanonicalType(RetTy);
- const LocationContext *LCtx = C.getLocationContext();
-
- if (CanRetTy->isStructureOrClassType()) {
- // Structure returns are safe since the compiler zeroes them out.
- SVal V = C.getSValBuilder().makeZeroVal(RetTy);
- C.addTransition(state->BindExpr(Msg.getOriginExpr(), LCtx, V), &Tag);
- return;
- }
-
- // Other cases: check if sizeof(return type) > sizeof(void*)
- if (CanRetTy != Ctx.VoidTy && C.getLocationContext()->getParentMap()
- .isConsumedExpr(Msg.getOriginExpr())) {
- // Compute: sizeof(void *) and sizeof(return type)
- const uint64_t voidPtrSize = Ctx.getTypeSize(Ctx.VoidPtrTy);
- const uint64_t returnTypeSize = Ctx.getTypeSize(CanRetTy);
-
- if (CanRetTy.getTypePtr()->isReferenceType()||
- (voidPtrSize < returnTypeSize &&
- !(supportsNilWithFloatRet(Ctx.getTargetInfo().getTriple()) &&
- (Ctx.FloatTy == CanRetTy ||
- Ctx.DoubleTy == CanRetTy ||
- Ctx.LongDoubleTy == CanRetTy ||
- Ctx.LongLongTy == CanRetTy ||
- Ctx.UnsignedLongLongTy == CanRetTy)))) {
- if (ExplodedNode *N = C.generateErrorNode(state, &Tag))
- emitNilReceiverBug(C, Msg, N);
- return;
- }
-
- // Handle the safe cases where the return value is 0 if the
- // receiver is nil.
- //
- // FIXME: For now take the conservative approach that we only
- // return null values if we *know* that the receiver is nil.
- // This is because we can have surprises like:
- //
- // ... = [[NSScreens screens] objectAtIndex:0];
- //
- // What can happen is that [... screens] could return nil, but
- // it most likely isn't nil. We should assume the semantics
- // of this case unless we have *a lot* more knowledge.
- //
- SVal V = C.getSValBuilder().makeZeroVal(RetTy);
- C.addTransition(state->BindExpr(Msg.getOriginExpr(), LCtx, V), &Tag);
- return;
- }
-
- C.addTransition(state);
-}
-
-#define REGISTER_CHECKER(name) \
- void ento::register##name(CheckerManager &mgr) { \
- CallAndMessageChecker *Checker = \
- mgr.registerChecker<CallAndMessageChecker>(); \
- Checker->Filter.Check_##name = true; \
- Checker->Filter.CheckName_##name = mgr.getCurrentCheckName(); \
- }
-
-REGISTER_CHECKER(CallAndMessageUnInitRefArg)
-REGISTER_CHECKER(CallAndMessageChecker)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.