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//== 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;
}
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