forked from OSchip/llvm-project
118 lines
4.2 KiB
C++
118 lines
4.2 KiB
C++
//===--- CopyConstructorInitCheck.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 "CopyConstructorInitCheck.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 bugprone {
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void CopyConstructorInitCheck::registerMatchers(MatchFinder *Finder) {
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// In the future this might be extended to move constructors?
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Finder->addMatcher(
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cxxConstructorDecl(
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isCopyConstructor(),
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hasAnyConstructorInitializer(cxxCtorInitializer(
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isBaseInitializer(),
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withInitializer(cxxConstructExpr(hasDeclaration(
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cxxConstructorDecl(isDefaultConstructor())))))),
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unless(isInstantiated()))
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.bind("ctor"),
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this);
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}
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void CopyConstructorInitCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *Ctor = Result.Nodes.getNodeAs<CXXConstructorDecl>("ctor");
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std::string ParamName = Ctor->getParamDecl(0)->getNameAsString();
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// We want only one warning (and FixIt) for each ctor.
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std::string FixItInitList;
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bool HasRelevantBaseInit = false;
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bool ShouldNotDoFixit = false;
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bool HasWrittenInitializer = false;
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SmallVector<FixItHint, 2> SafeFixIts;
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for (const auto *Init : Ctor->inits()) {
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bool CtorInitIsWritten = Init->isWritten();
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HasWrittenInitializer = HasWrittenInitializer || CtorInitIsWritten;
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if (!Init->isBaseInitializer())
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continue;
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const Type *BaseType = Init->getBaseClass();
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// Do not do fixits if there is a type alias involved or one of the bases
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// are explicitly initialized. In the latter case we not do fixits to avoid
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// -Wreorder warnings.
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if (const auto *TempSpecTy = dyn_cast<TemplateSpecializationType>(BaseType))
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ShouldNotDoFixit = ShouldNotDoFixit || TempSpecTy->isTypeAlias();
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ShouldNotDoFixit = ShouldNotDoFixit || isa<TypedefType>(BaseType);
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ShouldNotDoFixit = ShouldNotDoFixit || CtorInitIsWritten;
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const CXXRecordDecl *BaseClass =
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BaseType->getAsCXXRecordDecl()->getDefinition();
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if (BaseClass->field_empty() &&
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BaseClass->forallBases(
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[](const CXXRecordDecl *Class) { return Class->field_empty(); }))
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continue;
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bool NonCopyableBase = false;
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for (const auto *Ctor : BaseClass->ctors()) {
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if (Ctor->isCopyConstructor() &&
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(Ctor->getAccess() == AS_private || Ctor->isDeleted())) {
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NonCopyableBase = true;
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break;
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}
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}
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if (NonCopyableBase)
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continue;
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const auto *CExpr = dyn_cast<CXXConstructExpr>(Init->getInit());
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if (!CExpr || !CExpr->getConstructor()->isDefaultConstructor())
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continue;
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HasRelevantBaseInit = true;
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if (CtorInitIsWritten) {
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if (!ParamName.empty())
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SafeFixIts.push_back(
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FixItHint::CreateInsertion(CExpr->getEndLoc(), ParamName));
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} else {
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if (Init->getSourceLocation().isMacroID() ||
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Ctor->getLocation().isMacroID() || ShouldNotDoFixit)
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break;
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FixItInitList += BaseClass->getNameAsString();
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FixItInitList += "(" + ParamName + "), ";
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}
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}
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if (!HasRelevantBaseInit)
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return;
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auto Diag = diag(Ctor->getLocation(),
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"calling a base constructor other than the copy constructor")
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<< SafeFixIts;
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if (FixItInitList.empty() || ParamName.empty() || ShouldNotDoFixit)
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return;
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std::string FixItMsg{FixItInitList.substr(0, FixItInitList.size() - 2)};
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SourceLocation FixItLoc;
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// There is no initialization list in this constructor.
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if (!HasWrittenInitializer) {
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FixItLoc = Ctor->getBody()->getBeginLoc();
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FixItMsg = " : " + FixItMsg;
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} else {
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// We apply the missing ctors at the beginning of the initialization list.
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FixItLoc = (*Ctor->init_begin())->getSourceLocation();
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FixItMsg += ',';
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}
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FixItMsg += ' ';
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Diag << FixItHint::CreateInsertion(FixItLoc, FixItMsg);
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}
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} // namespace bugprone
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} // namespace tidy
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} // namespace clang
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