forked from OSchip/llvm-project
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
//===--- SuperSelfCheck.cpp - clang-tidy ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "SuperSelfCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace objc {
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namespace {
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/// Matches Objective-C methods in the initializer family.
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///
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/// Example matches -init and -initWithInt:.
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/// (matcher = objcMethodDecl(isInitializer()))
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/// \code
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/// @interface Foo
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/// - (instancetype)init;
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/// - (instancetype)initWithInt:(int)i;
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/// + (instancetype)init;
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/// - (void)bar;
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/// @end
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/// \endcode
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AST_MATCHER(ObjCMethodDecl, isInitializer) {
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return Node.getMethodFamily() == OMF_init;
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}
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/// Matches Objective-C implementations with interfaces that match
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/// \c Base.
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///
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/// Example matches implementation declarations for X.
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/// (matcher = objcImplementationDecl(hasInterface(hasName("X"))))
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/// \code
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/// @interface X
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/// @end
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/// @implementation X
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/// @end
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/// @interface Y
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// @end
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/// @implementation Y
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/// @end
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/// \endcode
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AST_MATCHER_P(ObjCImplementationDecl, hasInterface,
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ast_matchers::internal::Matcher<ObjCInterfaceDecl>, Base) {
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const ObjCInterfaceDecl *InterfaceDecl = Node.getClassInterface();
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return Base.matches(*InterfaceDecl, Finder, Builder);
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}
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/// Matches Objective-C message expressions where the receiver is the
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/// super instance.
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///
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/// Example matches the invocations of -banana and -orange.
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/// (matcher = objcMessageExpr(isMessagingSuperInstance()))
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/// \code
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/// - (void)banana {
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/// [self apple]
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/// [super banana];
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/// [super orange];
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/// }
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/// \endcode
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AST_MATCHER(ObjCMessageExpr, isMessagingSuperInstance) {
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return Node.getReceiverKind() == ObjCMessageExpr::SuperInstance;
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}
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} // namespace
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void SuperSelfCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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objcMessageExpr(hasSelector("self"), isMessagingSuperInstance(),
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hasAncestor(objcMethodDecl(
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isInitializer(),
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hasDeclContext(objcImplementationDecl(hasInterface(
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isDerivedFrom(hasName("NSObject"))))))))
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.bind("message"),
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this);
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}
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void SuperSelfCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *Message = Result.Nodes.getNodeAs<ObjCMessageExpr>("message");
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auto Diag = diag(Message->getExprLoc(), "suspicious invocation of %0 in "
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"initializer; did you mean to "
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"invoke a superclass initializer?")
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<< Message->getMethodDecl();
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SourceLocation ReceiverLoc = Message->getReceiverRange().getBegin();
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if (ReceiverLoc.isMacroID() || ReceiverLoc.isInvalid())
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return;
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SourceLocation SelectorLoc = Message->getSelectorStartLoc();
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if (SelectorLoc.isMacroID() || SelectorLoc.isInvalid())
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return;
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Diag << FixItHint::CreateReplacement(Message->getSourceRange(),
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StringRef("[super init]"));
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}
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} // namespace objc
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} // namespace tidy
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} // namespace clang
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