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//===--- UseDesignatedInitializersCheck.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 "UseDesignatedInitializersCheck.h"
#include "../utils/DesignatedInitializers.h"
#include "clang/AST/APValue.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Stmt.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchersMacros.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang::tidy::modernize {
static constexpr char IgnoreSingleElementAggregatesName[] =
"IgnoreSingleElementAggregates";
static constexpr bool IgnoreSingleElementAggregatesDefault = true;
static constexpr char RestrictToPODTypesName[] = "RestrictToPODTypes";
static constexpr bool RestrictToPODTypesDefault = false;
static constexpr char IgnoreMacrosName[] = "IgnoreMacros";
static constexpr bool IgnoreMacrosDefault = true;
static constexpr char StrictCStandardComplianceName[] =
"StrictCStandardCompliance";
static constexpr bool StrictCStandardComplianceDefault = true;
static constexpr char StrictCppStandardComplianceName[] =
"StrictCppStandardCompliance";
static constexpr bool StrictCppStandardComplianceDefault = true;
namespace {
struct Designators {
Designators(const InitListExpr *InitList) : InitList(InitList) {
assert(InitList->isSyntacticForm());
};
unsigned size() { return getCached().size(); }
std::optional<llvm::StringRef> operator[](const SourceLocation &Location) {
const auto &Designators = getCached();
const auto Result = Designators.find(Location);
if (Result == Designators.end())
return {};
const llvm::StringRef Designator = Result->getSecond();
return (Designator.front() == '.' ? Designator.substr(1) : Designator)
.trim("\0"); // Trim NULL characters appearing on Windows in the
// name.
}
private:
using LocationToNameMap = llvm::DenseMap<clang::SourceLocation, std::string>;
std::optional<LocationToNameMap> CachedDesignators;
const InitListExpr *InitList;
LocationToNameMap &getCached() {
return CachedDesignators ? *CachedDesignators
: CachedDesignators.emplace(
utils::getUnwrittenDesignators(InitList));
}
};
unsigned getNumberOfDesignated(const InitListExpr *SyntacticInitList) {
return llvm::count_if(*SyntacticInitList, [](auto *InitExpr) {
return isa<DesignatedInitExpr>(InitExpr);
});
}
AST_MATCHER(CXXRecordDecl, isAggregate) {
return Node.hasDefinition() && Node.isAggregate();
}
AST_MATCHER(CXXRecordDecl, isPOD) {
return Node.hasDefinition() && Node.isPOD();
}
AST_MATCHER(InitListExpr, isFullyDesignated) {
if (const InitListExpr *SyntacticForm =
Node.isSyntacticForm() ? &Node : Node.getSyntacticForm())
return getNumberOfDesignated(SyntacticForm) == SyntacticForm->getNumInits();
return true;
}
AST_MATCHER(InitListExpr, hasMoreThanOneElement) {
return Node.getNumInits() > 1;
}
} // namespace
UseDesignatedInitializersCheck::UseDesignatedInitializersCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context), IgnoreSingleElementAggregates(Options.get(
IgnoreSingleElementAggregatesName,
IgnoreSingleElementAggregatesDefault)),
RestrictToPODTypes(
Options.get(RestrictToPODTypesName, RestrictToPODTypesDefault)),
IgnoreMacros(
Options.getLocalOrGlobal(IgnoreMacrosName, IgnoreMacrosDefault)),
StrictCStandardCompliance(Options.get(StrictCStandardComplianceName,
StrictCStandardComplianceDefault)),
StrictCppStandardCompliance(
Options.get(StrictCppStandardComplianceName,
StrictCppStandardComplianceDefault)) {}
void UseDesignatedInitializersCheck::registerMatchers(MatchFinder *Finder) {
const auto HasBaseWithFields =
hasAnyBase(hasType(cxxRecordDecl(has(fieldDecl()))));
Finder->addMatcher(
initListExpr(
hasType(cxxRecordDecl(RestrictToPODTypes ? isPOD() : isAggregate(),
unless(HasBaseWithFields))
.bind("type")),
IgnoreSingleElementAggregates ? hasMoreThanOneElement() : anything(),
unless(isFullyDesignated()))
.bind("init"),
this);
}
void UseDesignatedInitializersCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *InitList = Result.Nodes.getNodeAs<InitListExpr>("init");
const auto *Type = Result.Nodes.getNodeAs<CXXRecordDecl>("type");
if (!Type || !InitList)
return;
const auto *SyntacticInitList = InitList->getSyntacticForm();
if (!SyntacticInitList)
return;
Designators Designators{SyntacticInitList};
const unsigned NumberOfDesignated = getNumberOfDesignated(SyntacticInitList);
if (SyntacticInitList->getNumInits() - NumberOfDesignated >
Designators.size())
return;
// If the whole initializer list is un-designated, issue only one warning and
// a single fix-it for the whole expression.
if (0 == NumberOfDesignated) {
if (IgnoreMacros && InitList->getBeginLoc().isMacroID())
return;
{
DiagnosticBuilder Diag =
diag(InitList->getLBraceLoc(),
"use designated initializer list to initialize %0");
Diag << Type << InitList->getSourceRange();
for (const Stmt *InitExpr : *SyntacticInitList) {
const auto Designator = Designators[InitExpr->getBeginLoc()];
if (Designator && !Designator->empty())
Diag << FixItHint::CreateInsertion(InitExpr->getBeginLoc(),
("." + *Designator + "=").str());
}
}
diag(Type->getBeginLoc(), "aggregate type is defined here",
DiagnosticIDs::Note);
return;
}
// In case that only a few elements are un-designated (not all as before), the
// check offers dedicated issues and fix-its for each of them.
for (const auto *InitExpr : *SyntacticInitList) {
if (isa<DesignatedInitExpr>(InitExpr))
continue;
if (IgnoreMacros && InitExpr->getBeginLoc().isMacroID())
continue;
const auto Designator = Designators[InitExpr->getBeginLoc()];
if (!Designator || Designator->empty()) {
// There should always be a designator. If there's unexpectedly none, we
// at least report a generic diagnostic.
diag(InitExpr->getBeginLoc(), "use designated init expression")
<< InitExpr->getSourceRange();
} else {
diag(InitExpr->getBeginLoc(),
"use designated init expression to initialize field '%0'")
<< InitExpr->getSourceRange() << *Designator
<< FixItHint::CreateInsertion(InitExpr->getBeginLoc(),
("." + *Designator + "=").str());
}
}
}
void UseDesignatedInitializersCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, IgnoreSingleElementAggregatesName,
IgnoreSingleElementAggregates);
Options.store(Opts, RestrictToPODTypesName, RestrictToPODTypes);
Options.store(Opts, IgnoreMacrosName, IgnoreMacros);
Options.store(Opts, StrictCStandardComplianceName, StrictCStandardCompliance);
Options.store(Opts, StrictCppStandardComplianceName,
StrictCppStandardCompliance);
}
} // namespace clang::tidy::modernize
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