forked from OSchip/llvm-project
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
//===--- RedundantDeclarationCheck.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 "RedundantDeclarationCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Lex/Lexer.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 readability {
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AST_MATCHER(FunctionDecl, doesDeclarationForceExternallyVisibleDefinition) {
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return Node.doesDeclarationForceExternallyVisibleDefinition();
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}
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RedundantDeclarationCheck::RedundantDeclarationCheck(StringRef Name,
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ClangTidyContext *Context)
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: ClangTidyCheck(Name, Context),
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IgnoreMacros(Options.getLocalOrGlobal("IgnoreMacros", true)) {}
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void RedundantDeclarationCheck::storeOptions(
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ClangTidyOptions::OptionMap &Opts) {
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Options.store(Opts, "IgnoreMacros", IgnoreMacros);
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}
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void RedundantDeclarationCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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namedDecl(anyOf(varDecl(unless(isDefinition())),
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functionDecl(unless(anyOf(
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isDefinition(), isDefaulted(),
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doesDeclarationForceExternallyVisibleDefinition(),
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hasAncestor(friendDecl()))))))
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.bind("Decl"),
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this);
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}
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void RedundantDeclarationCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *D = Result.Nodes.getNodeAs<NamedDecl>("Decl");
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const auto *Prev = D->getPreviousDecl();
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if (!Prev)
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return;
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if (!Prev->getLocation().isValid())
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return;
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if (Prev->getLocation() == D->getLocation())
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return;
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if (IgnoreMacros &&
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(D->getLocation().isMacroID() || Prev->getLocation().isMacroID()))
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return;
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// Don't complain when the previous declaration is a friend declaration.
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for (const auto &Parent : Result.Context->getParents(*Prev))
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if (Parent.get<FriendDecl>())
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return;
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const SourceManager &SM = *Result.SourceManager;
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const bool DifferentHeaders =
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!SM.isInMainFile(D->getLocation()) &&
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!SM.isWrittenInSameFile(Prev->getLocation(), D->getLocation());
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bool MultiVar = false;
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if (const auto *VD = dyn_cast<VarDecl>(D)) {
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// Is this a multivariable declaration?
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for (const auto *Other : VD->getDeclContext()->decls()) {
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if (Other != D && Other->getBeginLoc() == VD->getBeginLoc()) {
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MultiVar = true;
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break;
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}
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}
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}
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SourceLocation EndLoc = Lexer::getLocForEndOfToken(
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D->getSourceRange().getEnd(), 0, SM, Result.Context->getLangOpts());
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{
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auto Diag = diag(D->getLocation(), "redundant %0 declaration") << D;
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if (!MultiVar && !DifferentHeaders)
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Diag << FixItHint::CreateRemoval(
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SourceRange(D->getSourceRange().getBegin(), EndLoc));
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}
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diag(Prev->getLocation(), "previously declared here", DiagnosticIDs::Note);
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}
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} // namespace readability
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} // namespace tidy
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} // namespace clang
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