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//===--- OptionalValueConversionCheck.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 "OptionalValueConversionCheck.h"
#include "../utils/LexerUtils.h"
#include "../utils/Matchers.h"
#include "../utils/OptionsUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include <array>
using namespace clang::ast_matchers;
using clang::ast_matchers::internal::Matcher;
namespace clang::tidy::bugprone {
namespace {
AST_MATCHER_P(QualType, hasCleanType, Matcher<QualType>, InnerMatcher) {
return InnerMatcher.matches(
Node.getNonReferenceType().getUnqualifiedType().getCanonicalType(),
Finder, Builder);
}
constexpr std::array<StringRef, 2> NameList{
"::std::make_unique",
"::std::make_shared",
};
Matcher<Expr> constructFrom(Matcher<QualType> TypeMatcher,
Matcher<Expr> ArgumentMatcher) {
return expr(
anyOf(
// construct optional
cxxConstructExpr(argumentCountIs(1U), hasType(TypeMatcher),
hasArgument(0U, ArgumentMatcher)),
// known template methods in std
callExpr(argumentCountIs(1),
callee(functionDecl(
matchers::matchesAnyListedName(NameList),
hasTemplateArgument(0, refersToType(TypeMatcher)))),
hasArgument(0, ArgumentMatcher))),
unless(anyOf(hasAncestor(typeLoc()),
hasAncestor(expr(matchers::hasUnevaluatedContext())))));
}
} // namespace
OptionalValueConversionCheck::OptionalValueConversionCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
OptionalTypes(utils::options::parseStringList(
Options.get("OptionalTypes",
"::std::optional;::absl::optional;::boost::optional"))),
ValueMethods(utils::options::parseStringList(
Options.get("ValueMethods", "::value$;::get$"))) {}
std::optional<TraversalKind>
OptionalValueConversionCheck::getCheckTraversalKind() const {
return TK_AsIs;
}
void OptionalValueConversionCheck::registerMatchers(MatchFinder *Finder) {
auto BindOptionalType = qualType(
hasCleanType(qualType(hasDeclaration(namedDecl(
matchers::matchesAnyListedName(OptionalTypes))))
.bind("optional-type")));
auto EqualsBoundOptionalType =
qualType(hasCleanType(equalsBoundNode("optional-type")));
auto OptionalDereferenceMatcher = callExpr(
anyOf(
cxxOperatorCallExpr(hasOverloadedOperatorName("*"),
hasUnaryOperand(hasType(EqualsBoundOptionalType)))
.bind("op-call"),
cxxMemberCallExpr(thisPointerType(EqualsBoundOptionalType),
callee(cxxMethodDecl(anyOf(
hasOverloadedOperatorName("*"),
matchers::matchesAnyListedName(ValueMethods)))))
.bind("member-call")),
hasType(qualType().bind("value-type")));
auto StdMoveCallMatcher =
callExpr(argumentCountIs(1), callee(functionDecl(hasName("::std::move"))),
hasArgument(0, ignoringImpCasts(OptionalDereferenceMatcher)));
Finder->addMatcher(
expr(constructFrom(BindOptionalType,
ignoringImpCasts(anyOf(OptionalDereferenceMatcher,
StdMoveCallMatcher))))
.bind("expr"),
this);
}
void OptionalValueConversionCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "OptionalTypes",
utils::options::serializeStringList(OptionalTypes));
Options.store(Opts, "ValueMethods",
utils::options::serializeStringList(ValueMethods));
}
void OptionalValueConversionCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
const auto *OptionalType = Result.Nodes.getNodeAs<QualType>("optional-type");
const auto *ValueType = Result.Nodes.getNodeAs<QualType>("value-type");
diag(MatchedExpr->getExprLoc(),
"conversion from %0 into %1 and back into %0, remove potentially "
"error-prone optional dereference")
<< *OptionalType << ValueType->getUnqualifiedType();
if (const auto *OperatorExpr =
Result.Nodes.getNodeAs<CXXOperatorCallExpr>("op-call")) {
diag(OperatorExpr->getExprLoc(), "remove '*' to silence this warning",
DiagnosticIDs::Note)
<< FixItHint::CreateRemoval(CharSourceRange::getTokenRange(
OperatorExpr->getBeginLoc(), OperatorExpr->getExprLoc()));
return;
}
if (const auto *CallExpr =
Result.Nodes.getNodeAs<CXXMemberCallExpr>("member-call")) {
const SourceLocation Begin =
utils::lexer::getPreviousToken(CallExpr->getExprLoc(),
*Result.SourceManager, getLangOpts())
.getLocation();
auto Diag =
diag(CallExpr->getExprLoc(),
"remove call to %0 to silence this warning", DiagnosticIDs::Note);
Diag << CallExpr->getMethodDecl()
<< FixItHint::CreateRemoval(
CharSourceRange::getTokenRange(Begin, CallExpr->getEndLoc()));
if (const auto *Member =
llvm::dyn_cast<MemberExpr>(CallExpr->getCallee()->IgnoreImplicit());
Member && Member->isArrow())
Diag << FixItHint::CreateInsertion(CallExpr->getBeginLoc(), "*");
return;
}
}
} // namespace clang::tidy::bugprone
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