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