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//===--- UniqueptrResetReleaseCheck.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 "UniqueptrResetReleaseCheck.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace misc {
UniqueptrResetReleaseCheck::UniqueptrResetReleaseCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
Inserter(Options.getLocalOrGlobal("IncludeStyle",
utils::IncludeSorter::IS_LLVM)) {}
void UniqueptrResetReleaseCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "IncludeStyle", Inserter.getStyle());
}
void UniqueptrResetReleaseCheck::registerPPCallbacks(
const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
Inserter.registerPreprocessor(PP);
}
void UniqueptrResetReleaseCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
cxxMemberCallExpr(
callee(memberExpr(
member(cxxMethodDecl(
hasName("reset"),
ofClass(cxxRecordDecl(hasName("::std::unique_ptr"),
decl().bind("left_class"))))))
.bind("reset_member")),
hasArgument(
0, ignoringParenImpCasts(cxxMemberCallExpr(
on(expr().bind("right")),
callee(memberExpr(member(cxxMethodDecl(
hasName("release"),
ofClass(cxxRecordDecl(
hasName("::std::unique_ptr"),
decl().bind("right_class"))))))
.bind("release_member"))))))
.bind("reset_call"),
this);
}
namespace {
const Type *getDeleterForUniquePtr(const MatchFinder::MatchResult &Result,
StringRef ID) {
const auto *Class =
Result.Nodes.getNodeAs<ClassTemplateSpecializationDecl>(ID);
if (!Class)
return nullptr;
auto DeleterArgument = Class->getTemplateArgs()[1];
if (DeleterArgument.getKind() != TemplateArgument::Type)
return nullptr;
return DeleterArgument.getAsType().getTypePtr();
}
bool areDeletersCompatible(const MatchFinder::MatchResult &Result) {
const Type *LeftDeleterType = getDeleterForUniquePtr(Result, "left_class");
const Type *RightDeleterType = getDeleterForUniquePtr(Result, "right_class");
if (LeftDeleterType->getUnqualifiedDesugaredType() ==
RightDeleterType->getUnqualifiedDesugaredType()) {
// Same type. We assume they are compatible.
// This check handles the case where the deleters are function pointers.
return true;
}
const CXXRecordDecl *LeftDeleter = LeftDeleterType->getAsCXXRecordDecl();
const CXXRecordDecl *RightDeleter = RightDeleterType->getAsCXXRecordDecl();
if (!LeftDeleter || !RightDeleter)
return false;
if (LeftDeleter->getCanonicalDecl() == RightDeleter->getCanonicalDecl()) {
// Same class. We assume they are compatible.
return true;
}
const auto *LeftAsTemplate =
dyn_cast<ClassTemplateSpecializationDecl>(LeftDeleter);
const auto *RightAsTemplate =
dyn_cast<ClassTemplateSpecializationDecl>(RightDeleter);
if (LeftAsTemplate && RightAsTemplate &&
LeftAsTemplate->getSpecializedTemplate() ==
RightAsTemplate->getSpecializedTemplate()) {
// They are different instantiations of the same template. We assume they
// are compatible.
// This handles things like std::default_delete<Base> vs.
// std::default_delete<Derived>.
return true;
}
return false;
}
} // namespace
void UniqueptrResetReleaseCheck::check(const MatchFinder::MatchResult &Result) {
if (!areDeletersCompatible(Result))
return;
const auto *ResetMember = Result.Nodes.getNodeAs<MemberExpr>("reset_member");
const auto *ReleaseMember =
Result.Nodes.getNodeAs<MemberExpr>("release_member");
const auto *Right = Result.Nodes.getNodeAs<Expr>("right");
const auto *ResetCall =
Result.Nodes.getNodeAs<CXXMemberCallExpr>("reset_call");
StringRef AssignmentText = " = ";
StringRef TrailingText = "";
bool NeedsUtilityInclude = false;
if (ReleaseMember->isArrow()) {
AssignmentText = " = std::move(*";
TrailingText = ")";
NeedsUtilityInclude = true;
} else if (!Right->isPRValue()) {
AssignmentText = " = std::move(";
TrailingText = ")";
NeedsUtilityInclude = true;
}
auto D = diag(ResetMember->getExprLoc(),
"prefer 'unique_ptr<>' assignment over 'release' and 'reset'");
if (ResetMember->isArrow())
D << FixItHint::CreateInsertion(ResetMember->getBeginLoc(), "*");
D << FixItHint::CreateReplacement(
CharSourceRange::getCharRange(ResetMember->getOperatorLoc(),
Right->getBeginLoc()),
AssignmentText)
<< FixItHint::CreateReplacement(
CharSourceRange::getTokenRange(ReleaseMember->getOperatorLoc(),
ResetCall->getEndLoc()),
TrailingText);
if (NeedsUtilityInclude)
D << Inserter.createIncludeInsertion(
Result.SourceManager->getFileID(ResetMember->getBeginLoc()),
"<utility>");
}
} // namespace misc
} // namespace tidy
} // namespace clang
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