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llvm-project/clang-tools-extra/clang-tidy/modernize/UseDefaultMemberInitCheck.cpp

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//===--- UseDefaultMemberInitCheck.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 "UseDefaultMemberInitCheck.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 modernize {
namespace {
AST_MATCHER_P(InitListExpr, initCountIs, unsigned, N) {
return Node.getNumInits() == N;
}
} // namespace
static StringRef getValueOfValueInit(const QualType InitType) {
switch (InitType->getScalarTypeKind()) {
case Type::STK_CPointer:
case Type::STK_BlockPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_MemberPointer:
return "nullptr";
case Type::STK_Bool:
return "false";
case Type::STK_Integral:
switch (InitType->castAs<BuiltinType>()->getKind()) {
case BuiltinType::Char_U:
case BuiltinType::UChar:
case BuiltinType::Char_S:
case BuiltinType::SChar:
return "'\\0'";
case BuiltinType::WChar_U:
case BuiltinType::WChar_S:
return "L'\\0'";
case BuiltinType::Char16:
return "u'\\0'";
case BuiltinType::Char32:
return "U'\\0'";
default:
return "0";
}
case Type::STK_Floating:
switch (InitType->castAs<BuiltinType>()->getKind()) {
case BuiltinType::Half:
case BuiltinType::Float:
return "0.0f";
default:
return "0.0";
}
case Type::STK_FloatingComplex:
case Type::STK_IntegralComplex:
return getValueOfValueInit(
InitType->castAs<ComplexType>()->getElementType());
case Type::STK_FixedPoint:
switch (InitType->castAs<BuiltinType>()->getKind()) {
case BuiltinType::ShortAccum:
case BuiltinType::SatShortAccum:
return "0.0hk";
case BuiltinType::Accum:
case BuiltinType::SatAccum:
return "0.0k";
case BuiltinType::LongAccum:
case BuiltinType::SatLongAccum:
return "0.0lk";
case BuiltinType::UShortAccum:
case BuiltinType::SatUShortAccum:
return "0.0uhk";
case BuiltinType::UAccum:
case BuiltinType::SatUAccum:
return "0.0uk";
case BuiltinType::ULongAccum:
case BuiltinType::SatULongAccum:
return "0.0ulk";
case BuiltinType::ShortFract:
case BuiltinType::SatShortFract:
return "0.0hr";
case BuiltinType::Fract:
case BuiltinType::SatFract:
return "0.0r";
case BuiltinType::LongFract:
case BuiltinType::SatLongFract:
return "0.0lr";
case BuiltinType::UShortFract:
case BuiltinType::SatUShortFract:
return "0.0uhr";
case BuiltinType::UFract:
case BuiltinType::SatUFract:
return "0.0ur";
case BuiltinType::ULongFract:
case BuiltinType::SatULongFract:
return "0.0ulr";
default:
llvm_unreachable("Unhandled fixed point BuiltinType");
}
}
llvm_unreachable("Invalid scalar type kind");
}
static bool isZero(const Expr *E) {
switch (E->getStmtClass()) {
case Stmt::CXXNullPtrLiteralExprClass:
case Stmt::ImplicitValueInitExprClass:
return true;
case Stmt::InitListExprClass:
return cast<InitListExpr>(E)->getNumInits() == 0;
case Stmt::CharacterLiteralClass:
return !cast<CharacterLiteral>(E)->getValue();
case Stmt::CXXBoolLiteralExprClass:
return !cast<CXXBoolLiteralExpr>(E)->getValue();
case Stmt::IntegerLiteralClass:
return !cast<IntegerLiteral>(E)->getValue();
case Stmt::FloatingLiteralClass: {
llvm::APFloat Value = cast<FloatingLiteral>(E)->getValue();
return Value.isZero() && !Value.isNegative();
}
default:
return false;
}
}
static const Expr *ignoreUnaryPlus(const Expr *E) {
auto *UnaryOp = dyn_cast<UnaryOperator>(E);
if (UnaryOp && UnaryOp->getOpcode() == UO_Plus)
return UnaryOp->getSubExpr();
return E;
}
static const Expr *getInitializer(const Expr *E) {
auto *InitList = dyn_cast<InitListExpr>(E);
if (InitList && InitList->getNumInits() == 1)
return InitList->getInit(0)->IgnoreParenImpCasts();
return E;
}
static bool sameValue(const Expr *E1, const Expr *E2) {
E1 = ignoreUnaryPlus(getInitializer(E1->IgnoreParenImpCasts()));
E2 = ignoreUnaryPlus(getInitializer(E2->IgnoreParenImpCasts()));
if (isZero(E1) && isZero(E2))
return true;
if (E1->getStmtClass() != E2->getStmtClass())
return false;
switch (E1->getStmtClass()) {
case Stmt::UnaryOperatorClass:
return sameValue(cast<UnaryOperator>(E1)->getSubExpr(),
cast<UnaryOperator>(E2)->getSubExpr());
case Stmt::CharacterLiteralClass:
return cast<CharacterLiteral>(E1)->getValue() ==
cast<CharacterLiteral>(E2)->getValue();
case Stmt::CXXBoolLiteralExprClass:
return cast<CXXBoolLiteralExpr>(E1)->getValue() ==
cast<CXXBoolLiteralExpr>(E2)->getValue();
case Stmt::IntegerLiteralClass:
return cast<IntegerLiteral>(E1)->getValue() ==
cast<IntegerLiteral>(E2)->getValue();
case Stmt::FloatingLiteralClass:
return cast<FloatingLiteral>(E1)->getValue().bitwiseIsEqual(
cast<FloatingLiteral>(E2)->getValue());
case Stmt::StringLiteralClass:
return cast<StringLiteral>(E1)->getString() ==
cast<StringLiteral>(E2)->getString();
case Stmt::DeclRefExprClass:
return cast<DeclRefExpr>(E1)->getDecl() == cast<DeclRefExpr>(E2)->getDecl();
default:
return false;
}
}
UseDefaultMemberInitCheck::UseDefaultMemberInitCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
UseAssignment(Options.get("UseAssignment", false)),
IgnoreMacros(Options.getLocalOrGlobal("IgnoreMacros", true)) {}
void UseDefaultMemberInitCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "UseAssignment", UseAssignment);
Options.store(Opts, "IgnoreMacros", IgnoreMacros);
}
void UseDefaultMemberInitCheck::registerMatchers(MatchFinder *Finder) {
auto InitBase =
anyOf(stringLiteral(), characterLiteral(), integerLiteral(),
unaryOperator(hasAnyOperatorName("+", "-"),
hasUnaryOperand(integerLiteral())),
floatLiteral(),
unaryOperator(hasAnyOperatorName("+", "-"),
hasUnaryOperand(floatLiteral())),
cxxBoolLiteral(), cxxNullPtrLiteralExpr(), implicitValueInitExpr(),
declRefExpr(to(enumConstantDecl())));
auto Init =
anyOf(initListExpr(anyOf(allOf(initCountIs(1), hasInit(0, InitBase)),
initCountIs(0))),
InitBase);
Finder->addMatcher(
cxxConstructorDecl(forEachConstructorInitializer(
cxxCtorInitializer(
forField(unless(anyOf(
getLangOpts().CPlusPlus20 ? unless(anything()) : isBitField(),
hasInClassInitializer(anything()),
hasParent(recordDecl(isUnion()))))),
withInitializer(Init))
.bind("default"))),
this);
Finder->addMatcher(
cxxConstructorDecl(forEachConstructorInitializer(
cxxCtorInitializer(forField(hasInClassInitializer(anything())),
withInitializer(Init))
.bind("existing"))),
this);
}
void UseDefaultMemberInitCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *Default =
Result.Nodes.getNodeAs<CXXCtorInitializer>("default"))
checkDefaultInit(Result, Default);
else if (const auto *Existing =
Result.Nodes.getNodeAs<CXXCtorInitializer>("existing"))
checkExistingInit(Result, Existing);
else
llvm_unreachable("Bad Callback. No node provided.");
}
void UseDefaultMemberInitCheck::checkDefaultInit(
const MatchFinder::MatchResult &Result, const CXXCtorInitializer *Init) {
const FieldDecl *Field = Init->getAnyMember();
// Check whether we have multiple hand-written constructors and bomb out, as
// it is hard to reconcile their sets of member initializers.
const auto *ClassDecl = cast<CXXRecordDecl>(Field->getParent());
if (llvm::count_if(ClassDecl->ctors(), [](const CXXConstructorDecl *Ctor) {
return !Ctor->isCopyOrMoveConstructor();
}) > 1)
return;
SourceLocation StartLoc = Field->getBeginLoc();
if (StartLoc.isMacroID() && IgnoreMacros)
return;
SourceLocation FieldEnd =
Lexer::getLocForEndOfToken(Field->getSourceRange().getEnd(), 0,
*Result.SourceManager, getLangOpts());
SourceLocation LParenEnd = Lexer::getLocForEndOfToken(
Init->getLParenLoc(), 0, *Result.SourceManager, getLangOpts());
CharSourceRange InitRange =
CharSourceRange::getCharRange(LParenEnd, Init->getRParenLoc());
bool ValueInit = isa<ImplicitValueInitExpr>(Init->getInit());
bool CanAssign = UseAssignment && (!ValueInit || !Init->getInit()->getType()->isEnumeralType());
auto Diag =
diag(Field->getLocation(), "use default member initializer for %0")
<< Field
<< FixItHint::CreateInsertion(FieldEnd, CanAssign ? " = " : "{")
<< FixItHint::CreateInsertionFromRange(FieldEnd, InitRange);
if (CanAssign && ValueInit)
Diag << FixItHint::CreateInsertion(
FieldEnd, getValueOfValueInit(Init->getInit()->getType()));
if (!CanAssign)
Diag << FixItHint::CreateInsertion(FieldEnd, "}");
Diag << FixItHint::CreateRemoval(Init->getSourceRange());
}
void UseDefaultMemberInitCheck::checkExistingInit(
const MatchFinder::MatchResult &Result, const CXXCtorInitializer *Init) {
const FieldDecl *Field = Init->getAnyMember();
if (!sameValue(Field->getInClassInitializer(), Init->getInit()))
return;
diag(Init->getSourceLocation(), "member initializer for %0 is redundant")
<< Field
<< FixItHint::CreateRemoval(Init->getSourceRange());
}
} // namespace modernize
} // namespace tidy
} // namespace clang
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