NoAutomaticMoveCheck.cpp
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//===--- NoAutomaticMoveCheck.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 "NoAutomaticMoveCheck.h"
#include "../utils/Matchers.h"
#include "../utils/OptionsUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace performance {
NoAutomaticMoveCheck::NoAutomaticMoveCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
AllowedTypes(
utils::options::parseStringList(Options.get("AllowedTypes", ""))) {}
void NoAutomaticMoveCheck::registerMatchers(MatchFinder *Finder) {
const auto ConstLocalVariable =
varDecl(hasLocalStorage(), unless(hasType(lValueReferenceType())),
hasType(qualType(
isConstQualified(),
hasCanonicalType(matchers::isExpensiveToCopy()),
unless(hasDeclaration(namedDecl(
matchers::matchesAnyListedName(AllowedTypes)))))))
.bind("vardecl");
// A matcher for a `DstT::DstT(const Src&)` where DstT also has a
// `DstT::DstT(Src&&)`.
const auto LValueRefCtor = cxxConstructorDecl(
hasParameter(0,
hasType(lValueReferenceType(pointee(type().bind("SrcT"))))),
ofClass(cxxRecordDecl(hasMethod(cxxConstructorDecl(
hasParameter(0, hasType(rValueReferenceType(
pointee(type(equalsBoundNode("SrcT")))))))))));
Finder->addMatcher(
traverse(ast_type_traits::TK_AsIs,
returnStmt(hasReturnValue(
ignoringElidableConstructorCall(ignoringParenImpCasts(
cxxConstructExpr(
hasDeclaration(LValueRefCtor),
hasArgument(0, ignoringParenImpCasts(declRefExpr(
to(ConstLocalVariable)))))
.bind("ctor_call")))))),
this);
}
void NoAutomaticMoveCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Var = Result.Nodes.getNodeAs<VarDecl>("vardecl");
const auto *CtorCall = Result.Nodes.getNodeAs<Expr>("ctor_call");
diag(CtorCall->getExprLoc(), "constness of '%0' prevents automatic move")
<< Var->getName();
}
void NoAutomaticMoveCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "AllowedTypes",
utils::options::serializeStringList(AllowedTypes));
}
} // namespace performance
} // namespace tidy
} // namespace clang