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//===--- SuperSelfCheck.cpp - clang-tidy ----------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SuperSelfCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::objc {
namespace {
/// Matches Objective-C methods in the initializer family.
///
/// Example matches -init and -initWithInt:.
/// (matcher = objcMethodDecl(isInitializer()))
/// \code
/// @interface Foo
/// - (instancetype)init;
/// - (instancetype)initWithInt:(int)i;
/// + (instancetype)init;
/// - (void)bar;
/// @end
/// \endcode
AST_MATCHER(ObjCMethodDecl, isInitializer) {
return Node.getMethodFamily() == OMF_init;
}
/// Matches Objective-C implementations with interfaces that match
/// \c Base.
///
/// Example matches implementation declarations for X.
/// (matcher = objcImplementationDecl(hasInterface(hasName("X"))))
/// \code
/// @interface X
/// @end
/// @implementation X
/// @end
/// @interface Y
// @end
/// @implementation Y
/// @end
/// \endcode
AST_MATCHER_P(ObjCImplementationDecl, hasInterface,
ast_matchers::internal::Matcher<ObjCInterfaceDecl>, Base) {
const ObjCInterfaceDecl *InterfaceDecl = Node.getClassInterface();
return Base.matches(*InterfaceDecl, Finder, Builder);
}
/// Matches Objective-C message expressions where the receiver is the
/// super instance.
///
/// Example matches the invocations of -banana and -orange.
/// (matcher = objcMessageExpr(isMessagingSuperInstance()))
/// \code
/// - (void)banana {
/// [self apple]
/// [super banana];
/// [super orange];
/// }
/// \endcode
AST_MATCHER(ObjCMessageExpr, isMessagingSuperInstance) {
return Node.getReceiverKind() == ObjCMessageExpr::SuperInstance;
}
} // namespace
void SuperSelfCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
objcMessageExpr(hasSelector("self"), isMessagingSuperInstance(),
hasAncestor(objcMethodDecl(
isInitializer(),
hasDeclContext(objcImplementationDecl(hasInterface(
isDerivedFrom(hasName("NSObject"))))))))
.bind("message"),
this);
}
void SuperSelfCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Message = Result.Nodes.getNodeAs<ObjCMessageExpr>("message");
auto Diag = diag(Message->getExprLoc(), "suspicious invocation of %0 in "
"initializer; did you mean to "
"invoke a superclass initializer?")
<< Message->getMethodDecl();
SourceLocation ReceiverLoc = Message->getReceiverRange().getBegin();
if (ReceiverLoc.isMacroID() || ReceiverLoc.isInvalid())
return;
SourceLocation SelectorLoc = Message->getSelectorStartLoc();
if (SelectorLoc.isMacroID() || SelectorLoc.isInvalid())
return;
Diag << FixItHint::CreateReplacement(Message->getSourceRange(),
StringRef("[super init]"));
}
} // namespace clang::tidy::objc
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