| //== TrustReturnsNonnullChecker.cpp -- API nullability modeling -*- C++ -*--==// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This checker adds nullability-related assumptions to methods annotated with |
| // returns_nonnull attribute. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/AST/Attr.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| namespace { |
| |
| class TrustReturnsNonnullChecker : public Checker<check::PostCall> { |
| |
| public: |
| TrustReturnsNonnullChecker(ASTContext &Ctx) {} |
| |
| void checkPostCall(const CallEvent &Call, CheckerContext &C) const { |
| ProgramStateRef State = C.getState(); |
| |
| if (isNonNullPtr(Call)) |
| if (auto L = Call.getReturnValue().getAs<Loc>()) |
| State = State->assume(*L, /*assumption=*/true); |
| |
| C.addTransition(State); |
| } |
| |
| private: |
| /// \returns Whether the method declaration has the attribute returns_nonnull. |
| bool isNonNullPtr(const CallEvent &Call) const { |
| QualType ExprRetType = Call.getResultType(); |
| const Decl *CallDeclaration = Call.getDecl(); |
| if (!ExprRetType->isAnyPointerType() || !CallDeclaration) |
| return false; |
| |
| return CallDeclaration->hasAttr<ReturnsNonNullAttr>(); |
| } |
| }; |
| |
| } // namespace |
| |
| void ento::registerTrustReturnsNonnullChecker(CheckerManager &Mgr) { |
| Mgr.registerChecker<TrustReturnsNonnullChecker>(Mgr.getASTContext()); |
| } |
| |
| bool ento::shouldRegisterTrustReturnsNonnullChecker(const CheckerManager &mgr) { |
| return true; |
| } |