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Sema.cpp
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Sema.cpp
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//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the actions class which performs semantic analysis and
// builds an AST out of a parse stream.
//
//===----------------------------------------------------------------------===//
#include "UsedDeclVisitor.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclFriend.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/PrettyDeclStackTrace.h"
#include "clang/AST/StmtCXX.h"
#include "clang/Basic/DarwinSDKInfo.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Stack.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/CXXFieldCollector.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/EnterExpressionEvaluationContext.h"
#include "clang/Sema/ExternalSemaSource.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/MultiplexExternalSemaSource.h"
#include "clang/Sema/ObjCMethodList.h"
#include "clang/Sema/RISCVIntrinsicManager.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaConsumer.h"
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/TemplateDeduction.h"
#include "clang/Sema/TemplateInstCallback.h"
#include "clang/Sema/TypoCorrection.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/TimeProfiler.h"
#include <optional>
using namespace clang;
using namespace sema;
SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
}
ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
DarwinSDKInfo *
Sema::getDarwinSDKInfoForAvailabilityChecking(SourceLocation Loc,
StringRef Platform) {
auto *SDKInfo = getDarwinSDKInfoForAvailabilityChecking();
if (!SDKInfo && !WarnedDarwinSDKInfoMissing) {
Diag(Loc, diag::warn_missing_sdksettings_for_availability_checking)
<< Platform;
WarnedDarwinSDKInfoMissing = true;
}
return SDKInfo;
}
DarwinSDKInfo *Sema::getDarwinSDKInfoForAvailabilityChecking() {
if (CachedDarwinSDKInfo)
return CachedDarwinSDKInfo->get();
auto SDKInfo = parseDarwinSDKInfo(
PP.getFileManager().getVirtualFileSystem(),
PP.getHeaderSearchInfo().getHeaderSearchOpts().Sysroot);
if (SDKInfo && *SDKInfo) {
CachedDarwinSDKInfo = std::make_unique<DarwinSDKInfo>(std::move(**SDKInfo));
return CachedDarwinSDKInfo->get();
}
if (!SDKInfo)
llvm::consumeError(SDKInfo.takeError());
CachedDarwinSDKInfo = std::unique_ptr<DarwinSDKInfo>();
return nullptr;
}
IdentifierInfo *
Sema::InventAbbreviatedTemplateParameterTypeName(IdentifierInfo *ParamName,
unsigned int Index) {
std::string InventedName;
llvm::raw_string_ostream OS(InventedName);
if (!ParamName)
OS << "auto:" << Index + 1;
else
OS << ParamName->getName() << ":auto";
OS.flush();
return &Context.Idents.get(OS.str());
}
PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
const Preprocessor &PP) {
PrintingPolicy Policy = Context.getPrintingPolicy();
// In diagnostics, we print _Bool as bool if the latter is defined as the
// former.
Policy.Bool = Context.getLangOpts().Bool;
if (!Policy.Bool) {
if (const MacroInfo *BoolMacro = PP.getMacroInfo(Context.getBoolName())) {
Policy.Bool = BoolMacro->isObjectLike() &&
BoolMacro->getNumTokens() == 1 &&
BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
}
}
// Shorten the data output if needed
Policy.EntireContentsOfLargeArray = false;
return Policy;
}
void Sema::ActOnTranslationUnitScope(Scope *S) {
TUScope = S;
PushDeclContext(S, Context.getTranslationUnitDecl());
}
namespace clang {
namespace sema {
class SemaPPCallbacks : public PPCallbacks {
Sema *S = nullptr;
llvm::SmallVector<SourceLocation, 8> IncludeStack;
public:
void set(Sema &S) { this->S = &S; }
void reset() { S = nullptr; }
void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType,
FileID PrevFID) override {
if (!S)
return;
switch (Reason) {
case EnterFile: {
SourceManager &SM = S->getSourceManager();
SourceLocation IncludeLoc = SM.getIncludeLoc(SM.getFileID(Loc));
if (IncludeLoc.isValid()) {
if (llvm::timeTraceProfilerEnabled()) {
const FileEntry *FE = SM.getFileEntryForID(SM.getFileID(Loc));
llvm::timeTraceProfilerBegin(
"Source", FE != nullptr ? FE->getName() : StringRef("<unknown>"));
}
IncludeStack.push_back(IncludeLoc);
S->DiagnoseNonDefaultPragmaAlignPack(
Sema::PragmaAlignPackDiagnoseKind::NonDefaultStateAtInclude,
IncludeLoc);
}
break;
}
case ExitFile:
if (!IncludeStack.empty()) {
if (llvm::timeTraceProfilerEnabled())
llvm::timeTraceProfilerEnd();
S->DiagnoseNonDefaultPragmaAlignPack(
Sema::PragmaAlignPackDiagnoseKind::ChangedStateAtExit,
IncludeStack.pop_back_val());
}
break;
default:
break;
}
}
};
} // end namespace sema
} // end namespace clang
const unsigned Sema::MaxAlignmentExponent;
const uint64_t Sema::MaximumAlignment;
Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
: ExternalSource(nullptr), CurFPFeatures(pp.getLangOpts()),
LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
CollectStats(false), CodeCompleter(CodeCompleter), CurContext(nullptr),
OriginalLexicalContext(nullptr), MSStructPragmaOn(false),
MSPointerToMemberRepresentationMethod(
LangOpts.getMSPointerToMemberRepresentationMethod()),
VtorDispStack(LangOpts.getVtorDispMode()),
AlignPackStack(AlignPackInfo(getLangOpts().XLPragmaPack)),
DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
CodeSegStack(nullptr), StrictGuardStackCheckStack(false),
FpPragmaStack(FPOptionsOverride()), CurInitSeg(nullptr),
VisContext(nullptr), PragmaAttributeCurrentTargetDecl(nullptr),
IsBuildingRecoveryCallExpr(false), LateTemplateParser(nullptr),
LateTemplateParserCleanup(nullptr), OpaqueParser(nullptr), IdResolver(pp),
StdInitializerList(nullptr), StdCoroutineTraitsCache(nullptr),
CXXTypeInfoDecl(nullptr), StdSourceLocationImplDecl(nullptr),
NSNumberDecl(nullptr), NSValueDecl(nullptr), NSStringDecl(nullptr),
StringWithUTF8StringMethod(nullptr),
ValueWithBytesObjCTypeMethod(nullptr), NSArrayDecl(nullptr),
ArrayWithObjectsMethod(nullptr), NSDictionaryDecl(nullptr),
DictionaryWithObjectsMethod(nullptr), GlobalNewDeleteDeclared(false),
TUKind(TUKind), NumSFINAEErrors(0),
FullyCheckedComparisonCategories(
static_cast<unsigned>(ComparisonCategoryType::Last) + 1),
SatisfactionCache(Context), AccessCheckingSFINAE(false),
InNonInstantiationSFINAEContext(false), NonInstantiationEntries(0),
ArgumentPackSubstitutionIndex(-1), CurrentInstantiationScope(nullptr),
DisableTypoCorrection(false), TyposCorrected(0), AnalysisWarnings(*this),
ThreadSafetyDeclCache(nullptr), VarDataSharingAttributesStack(nullptr),
CurScope(nullptr), Ident_super(nullptr) {
assert(pp.TUKind == TUKind);
TUScope = nullptr;
isConstantEvaluatedOverride = false;
LoadedExternalKnownNamespaces = false;
for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
NSNumberLiteralMethods[I] = nullptr;
if (getLangOpts().ObjC)
NSAPIObj.reset(new NSAPI(Context));
if (getLangOpts().CPlusPlus)
FieldCollector.reset(new CXXFieldCollector());
// Tell diagnostics how to render things from the AST library.
Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
// This evaluation context exists to ensure that there's always at least one
// valid evaluation context available. It is never removed from the
// evaluation stack.
ExprEvalContexts.emplace_back(
ExpressionEvaluationContext::PotentiallyEvaluated, 0, CleanupInfo{},
nullptr, ExpressionEvaluationContextRecord::EK_Other);
// Initialization of data sharing attributes stack for OpenMP
InitDataSharingAttributesStack();
std::unique_ptr<sema::SemaPPCallbacks> Callbacks =
std::make_unique<sema::SemaPPCallbacks>();
SemaPPCallbackHandler = Callbacks.get();
PP.addPPCallbacks(std::move(Callbacks));
SemaPPCallbackHandler->set(*this);
CurFPFeatures.setFPEvalMethod(PP.getCurrentFPEvalMethod());
}
// Anchor Sema's type info to this TU.
void Sema::anchor() {}
void Sema::addImplicitTypedef(StringRef Name, QualType T) {
DeclarationName DN = &Context.Idents.get(Name);
if (IdResolver.begin(DN) == IdResolver.end())
PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
}
void Sema::Initialize() {
if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
SC->InitializeSema(*this);
// Tell the external Sema source about this Sema object.
if (ExternalSemaSource *ExternalSema
= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
ExternalSema->InitializeSema(*this);
// This needs to happen after ExternalSemaSource::InitializeSema(this) or we
// will not be able to merge any duplicate __va_list_tag decls correctly.
VAListTagName = PP.getIdentifierInfo("__va_list_tag");
if (!TUScope)
return;
// Initialize predefined 128-bit integer types, if needed.
if (Context.getTargetInfo().hasInt128Type() ||
(Context.getAuxTargetInfo() &&
Context.getAuxTargetInfo()->hasInt128Type())) {
// If either of the 128-bit integer types are unavailable to name lookup,
// define them now.
DeclarationName Int128 = &Context.Idents.get("__int128_t");
if (IdResolver.begin(Int128) == IdResolver.end())
PushOnScopeChains(Context.getInt128Decl(), TUScope);
DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
if (IdResolver.begin(UInt128) == IdResolver.end())
PushOnScopeChains(Context.getUInt128Decl(), TUScope);
}
// Initialize predefined Objective-C types:
if (getLangOpts().ObjC) {
// If 'SEL' does not yet refer to any declarations, make it refer to the
// predefined 'SEL'.
DeclarationName SEL = &Context.Idents.get("SEL");
if (IdResolver.begin(SEL) == IdResolver.end())
PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
// If 'id' does not yet refer to any declarations, make it refer to the
// predefined 'id'.
DeclarationName Id = &Context.Idents.get("id");
if (IdResolver.begin(Id) == IdResolver.end())
PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
// Create the built-in typedef for 'Class'.
DeclarationName Class = &Context.Idents.get("Class");
if (IdResolver.begin(Class) == IdResolver.end())
PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
// Create the built-in forward declaratino for 'Protocol'.
DeclarationName Protocol = &Context.Idents.get("Protocol");
if (IdResolver.begin(Protocol) == IdResolver.end())
PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
}
// Create the internal type for the *StringMakeConstantString builtins.
DeclarationName ConstantString = &Context.Idents.get("__NSConstantString");
if (IdResolver.begin(ConstantString) == IdResolver.end())
PushOnScopeChains(Context.getCFConstantStringDecl(), TUScope);
// Initialize Microsoft "predefined C++ types".
if (getLangOpts().MSVCCompat) {
if (getLangOpts().CPlusPlus &&
IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
TUScope);
addImplicitTypedef("size_t", Context.getSizeType());
}
// Initialize predefined OpenCL types and supported extensions and (optional)
// core features.
if (getLangOpts().OpenCL) {
getOpenCLOptions().addSupport(
Context.getTargetInfo().getSupportedOpenCLOpts(), getLangOpts());
addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
addImplicitTypedef("event_t", Context.OCLEventTy);
auto OCLCompatibleVersion = getLangOpts().getOpenCLCompatibleVersion();
if (OCLCompatibleVersion >= 200) {
if (getLangOpts().OpenCLCPlusPlus || getLangOpts().Blocks) {
addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
addImplicitTypedef("queue_t", Context.OCLQueueTy);
}
if (getLangOpts().OpenCLPipes)
addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
addImplicitTypedef("atomic_uint",
Context.getAtomicType(Context.UnsignedIntTy));
addImplicitTypedef("atomic_float",
Context.getAtomicType(Context.FloatTy));
// OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
// 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
// OpenCL v2.0 s6.13.11.6:
// - The atomic_long and atomic_ulong types are supported if the
// cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
// extensions are supported.
// - The atomic_double type is only supported if double precision
// is supported and the cl_khr_int64_base_atomics and
// cl_khr_int64_extended_atomics extensions are supported.
// - If the device address space is 64-bits, the data types
// atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
// atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
// cl_khr_int64_extended_atomics extensions are supported.
auto AddPointerSizeDependentTypes = [&]() {
auto AtomicSizeT = Context.getAtomicType(Context.getSizeType());
auto AtomicIntPtrT = Context.getAtomicType(Context.getIntPtrType());
auto AtomicUIntPtrT = Context.getAtomicType(Context.getUIntPtrType());
auto AtomicPtrDiffT =
Context.getAtomicType(Context.getPointerDiffType());
addImplicitTypedef("atomic_size_t", AtomicSizeT);
addImplicitTypedef("atomic_intptr_t", AtomicIntPtrT);
addImplicitTypedef("atomic_uintptr_t", AtomicUIntPtrT);
addImplicitTypedef("atomic_ptrdiff_t", AtomicPtrDiffT);
};
if (Context.getTypeSize(Context.getSizeType()) == 32) {
AddPointerSizeDependentTypes();
}
if (getOpenCLOptions().isSupported("cl_khr_fp16", getLangOpts())) {
auto AtomicHalfT = Context.getAtomicType(Context.HalfTy);
addImplicitTypedef("atomic_half", AtomicHalfT);
}
std::vector<QualType> Atomic64BitTypes;
if (getOpenCLOptions().isSupported("cl_khr_int64_base_atomics",
getLangOpts()) &&
getOpenCLOptions().isSupported("cl_khr_int64_extended_atomics",
getLangOpts())) {
if (getOpenCLOptions().isSupported("cl_khr_fp64", getLangOpts())) {
auto AtomicDoubleT = Context.getAtomicType(Context.DoubleTy);
addImplicitTypedef("atomic_double", AtomicDoubleT);
Atomic64BitTypes.push_back(AtomicDoubleT);
}
auto AtomicLongT = Context.getAtomicType(Context.LongTy);
auto AtomicULongT = Context.getAtomicType(Context.UnsignedLongTy);
addImplicitTypedef("atomic_long", AtomicLongT);
addImplicitTypedef("atomic_ulong", AtomicULongT);
if (Context.getTypeSize(Context.getSizeType()) == 64) {
AddPointerSizeDependentTypes();
}
}
}
#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
if (getOpenCLOptions().isSupported(#Ext, getLangOpts())) { \
addImplicitTypedef(#ExtType, Context.Id##Ty); \
}
#include "clang/Basic/OpenCLExtensionTypes.def"
}
if (Context.getTargetInfo().hasAArch64SVETypes()) {
#define SVE_TYPE(Name, Id, SingletonId) \
addImplicitTypedef(Name, Context.SingletonId);
#include "clang/Basic/AArch64SVEACLETypes.def"
}
if (Context.getTargetInfo().getTriple().isPPC64()) {
#define PPC_VECTOR_MMA_TYPE(Name, Id, Size) \
addImplicitTypedef(#Name, Context.Id##Ty);
#include "clang/Basic/PPCTypes.def"
#define PPC_VECTOR_VSX_TYPE(Name, Id, Size) \
addImplicitTypedef(#Name, Context.Id##Ty);
#include "clang/Basic/PPCTypes.def"
}
if (Context.getTargetInfo().hasRISCVVTypes()) {
#define RVV_TYPE(Name, Id, SingletonId) \
addImplicitTypedef(Name, Context.SingletonId);
#include "clang/Basic/RISCVVTypes.def"
}
if (Context.getTargetInfo().getTriple().isWasm() &&
Context.getTargetInfo().hasFeature("reference-types")) {
#define WASM_TYPE(Name, Id, SingletonId) \
addImplicitTypedef(Name, Context.SingletonId);
#include "clang/Basic/WebAssemblyReferenceTypes.def"
}
if (Context.getTargetInfo().hasBuiltinMSVaList()) {
DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
if (IdResolver.begin(MSVaList) == IdResolver.end())
PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
}
DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
}
Sema::~Sema() {
assert(InstantiatingSpecializations.empty() &&
"failed to clean up an InstantiatingTemplate?");
if (VisContext) FreeVisContext();
// Kill all the active scopes.
for (sema::FunctionScopeInfo *FSI : FunctionScopes)
delete FSI;
// Tell the SemaConsumer to forget about us; we're going out of scope.
if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
SC->ForgetSema();
// Detach from the external Sema source.
if (ExternalSemaSource *ExternalSema
= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
ExternalSema->ForgetSema();
// Delete cached satisfactions.
std::vector<ConstraintSatisfaction *> Satisfactions;
Satisfactions.reserve(Satisfactions.size());
for (auto &Node : SatisfactionCache)
Satisfactions.push_back(&Node);
for (auto *Node : Satisfactions)
delete Node;
threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
// Destroys data sharing attributes stack for OpenMP
DestroyDataSharingAttributesStack();
// Detach from the PP callback handler which outlives Sema since it's owned
// by the preprocessor.
SemaPPCallbackHandler->reset();
}
void Sema::warnStackExhausted(SourceLocation Loc) {
// Only warn about this once.
if (!WarnedStackExhausted) {
Diag(Loc, diag::warn_stack_exhausted);
WarnedStackExhausted = true;
}
}
void Sema::runWithSufficientStackSpace(SourceLocation Loc,
llvm::function_ref<void()> Fn) {
clang::runWithSufficientStackSpace([&] { warnStackExhausted(Loc); }, Fn);
}
/// makeUnavailableInSystemHeader - There is an error in the current
/// context. If we're still in a system header, and we can plausibly
/// make the relevant declaration unavailable instead of erroring, do
/// so and return true.
bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
UnavailableAttr::ImplicitReason reason) {
// If we're not in a function, it's an error.
FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
if (!fn) return false;
// If we're in template instantiation, it's an error.
if (inTemplateInstantiation())
return false;
// If that function's not in a system header, it's an error.
if (!Context.getSourceManager().isInSystemHeader(loc))
return false;
// If the function is already unavailable, it's not an error.
if (fn->hasAttr<UnavailableAttr>()) return true;
fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
return true;
}
ASTMutationListener *Sema::getASTMutationListener() const {
return getASTConsumer().GetASTMutationListener();
}
///Registers an external source. If an external source already exists,
/// creates a multiplex external source and appends to it.
///
///\param[in] E - A non-null external sema source.
///
void Sema::addExternalSource(ExternalSemaSource *E) {
assert(E && "Cannot use with NULL ptr");
if (!ExternalSource) {
ExternalSource = E;
return;
}
if (auto *Ex = dyn_cast<MultiplexExternalSemaSource>(ExternalSource))
Ex->AddSource(E);
else
ExternalSource = new MultiplexExternalSemaSource(ExternalSource.get(), E);
}
/// Print out statistics about the semantic analysis.
void Sema::PrintStats() const {
llvm::errs() << "\n*** Semantic Analysis Stats:\n";
llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
BumpAlloc.PrintStats();
AnalysisWarnings.PrintStats();
}
void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
QualType SrcType,
SourceLocation Loc) {
std::optional<NullabilityKind> ExprNullability = SrcType->getNullability();
if (!ExprNullability || (*ExprNullability != NullabilityKind::Nullable &&
*ExprNullability != NullabilityKind::NullableResult))
return;
std::optional<NullabilityKind> TypeNullability = DstType->getNullability();
if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
return;
Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
}
void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E) {
// nullptr only exists from C++11 on, so don't warn on its absence earlier.
if (!getLangOpts().CPlusPlus11)
return;
if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
return;
if (E->IgnoreParenImpCasts()->getType()->isNullPtrType())
return;
if (Diags.isIgnored(diag::warn_zero_as_null_pointer_constant,
E->getBeginLoc()))
return;
// Don't diagnose the conversion from a 0 literal to a null pointer argument
// in a synthesized call to operator<=>.
if (!CodeSynthesisContexts.empty() &&
CodeSynthesisContexts.back().Kind ==
CodeSynthesisContext::RewritingOperatorAsSpaceship)
return;
// Ignore null pointers in defaulted comparison operators.
FunctionDecl *FD = getCurFunctionDecl();
if (FD && FD->isDefaulted()) {
return;
}
// If it is a macro from system header, and if the macro name is not "NULL",
// do not warn.
SourceLocation MaybeMacroLoc = E->getBeginLoc();
if (Diags.getSuppressSystemWarnings() &&
SourceMgr.isInSystemMacro(MaybeMacroLoc) &&
!findMacroSpelling(MaybeMacroLoc, "NULL"))
return;
Diag(E->getBeginLoc(), diag::warn_zero_as_null_pointer_constant)
<< FixItHint::CreateReplacement(E->getSourceRange(), "nullptr");
}
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
/// If there is already an implicit cast, merge into the existing one.
/// The result is of the given category.
ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
CastKind Kind, ExprValueKind VK,
const CXXCastPath *BasePath,
CheckedConversionKind CCK) {
#ifndef NDEBUG
if (VK == VK_PRValue && !E->isPRValue()) {
switch (Kind) {
default:
llvm_unreachable(
("can't implicitly cast glvalue to prvalue with this cast "
"kind: " +
std::string(CastExpr::getCastKindName(Kind)))
.c_str());
case CK_Dependent:
case CK_LValueToRValue:
case CK_ArrayToPointerDecay:
case CK_FunctionToPointerDecay:
case CK_ToVoid:
case CK_NonAtomicToAtomic:
break;
}
}
assert((VK == VK_PRValue || Kind == CK_Dependent || !E->isPRValue()) &&
"can't cast prvalue to glvalue");
#endif
diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getBeginLoc());
diagnoseZeroToNullptrConversion(Kind, E);
QualType ExprTy = Context.getCanonicalType(E->getType());
QualType TypeTy = Context.getCanonicalType(Ty);
if (ExprTy == TypeTy)
return E;
if (Kind == CK_ArrayToPointerDecay) {
// C++1z [conv.array]: The temporary materialization conversion is applied.
// We also use this to fuel C++ DR1213, which applies to C++11 onwards.
if (getLangOpts().CPlusPlus && E->isPRValue()) {
// The temporary is an lvalue in C++98 and an xvalue otherwise.
ExprResult Materialized = CreateMaterializeTemporaryExpr(
E->getType(), E, !getLangOpts().CPlusPlus11);
if (Materialized.isInvalid())
return ExprError();
E = Materialized.get();
}
// C17 6.7.1p6 footnote 124: The implementation can treat any register
// declaration simply as an auto declaration. However, whether or not
// addressable storage is actually used, the address of any part of an
// object declared with storage-class specifier register cannot be
// computed, either explicitly(by use of the unary & operator as discussed
// in 6.5.3.2) or implicitly(by converting an array name to a pointer as
// discussed in 6.3.2.1).Thus, the only operator that can be applied to an
// array declared with storage-class specifier register is sizeof.
if (VK == VK_PRValue && !getLangOpts().CPlusPlus && !E->isPRValue()) {
if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl())) {
if (VD->getStorageClass() == SC_Register) {
Diag(E->getExprLoc(), diag::err_typecheck_address_of)
<< /*register variable*/ 3 << E->getSourceRange();
return ExprError();
}
}
}
}
}
if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
ImpCast->setType(Ty);
ImpCast->setValueKind(VK);
return E;
}
}
return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK,
CurFPFeatureOverrides());
}
/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
/// to the conversion from scalar type ScalarTy to the Boolean type.
CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
switch (ScalarTy->getScalarTypeKind()) {
case Type::STK_Bool: return CK_NoOp;
case Type::STK_CPointer: return CK_PointerToBoolean;
case Type::STK_BlockPointer: return CK_PointerToBoolean;
case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
case Type::STK_Integral: return CK_IntegralToBoolean;
case Type::STK_Floating: return CK_FloatingToBoolean;
case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
case Type::STK_FixedPoint: return CK_FixedPointToBoolean;
}
llvm_unreachable("unknown scalar type kind");
}
/// Used to prune the decls of Sema's UnusedFileScopedDecls vector.
static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
if (D->getMostRecentDecl()->isUsed())
return true;
if (D->isExternallyVisible())
return true;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
// If this is a function template and none of its specializations is used,
// we should warn.
if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
for (const auto *Spec : Template->specializations())
if (ShouldRemoveFromUnused(SemaRef, Spec))
return true;
// UnusedFileScopedDecls stores the first declaration.
// The declaration may have become definition so check again.
const FunctionDecl *DeclToCheck;
if (FD->hasBody(DeclToCheck))
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
// Later redecls may add new information resulting in not having to warn,
// so check again.
DeclToCheck = FD->getMostRecentDecl();
if (DeclToCheck != FD)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
}
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
// If a variable usable in constant expressions is referenced,
// don't warn if it isn't used: if the value of a variable is required
// for the computation of a constant expression, it doesn't make sense to
// warn even if the variable isn't odr-used. (isReferenced doesn't
// precisely reflect that, but it's a decent approximation.)
if (VD->isReferenced() &&
VD->mightBeUsableInConstantExpressions(SemaRef->Context))
return true;
if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
// If this is a variable template and none of its specializations is used,
// we should warn.
for (const auto *Spec : Template->specializations())
if (ShouldRemoveFromUnused(SemaRef, Spec))
return true;
// UnusedFileScopedDecls stores the first declaration.
// The declaration may have become definition so check again.
const VarDecl *DeclToCheck = VD->getDefinition();
if (DeclToCheck)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
// Later redecls may add new information resulting in not having to warn,
// so check again.
DeclToCheck = VD->getMostRecentDecl();
if (DeclToCheck != VD)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
}
return false;
}
static bool isFunctionOrVarDeclExternC(const NamedDecl *ND) {
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
return FD->isExternC();
return cast<VarDecl>(ND)->isExternC();
}
/// Determine whether ND is an external-linkage function or variable whose
/// type has no linkage.
bool Sema::isExternalWithNoLinkageType(const ValueDecl *VD) const {
// Note: it's not quite enough to check whether VD has UniqueExternalLinkage,
// because we also want to catch the case where its type has VisibleNoLinkage,
// which does not affect the linkage of VD.
return getLangOpts().CPlusPlus && VD->hasExternalFormalLinkage() &&
!isExternalFormalLinkage(VD->getType()->getLinkage()) &&
!isFunctionOrVarDeclExternC(VD);
}
/// Obtains a sorted list of functions and variables that are undefined but
/// ODR-used.
void Sema::getUndefinedButUsed(
SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
for (const auto &UndefinedUse : UndefinedButUsed) {
NamedDecl *ND = UndefinedUse.first;
// Ignore attributes that have become invalid.
if (ND->isInvalidDecl()) continue;
// __attribute__((weakref)) is basically a definition.
if (ND->hasAttr<WeakRefAttr>()) continue;
if (isa<CXXDeductionGuideDecl>(ND))
continue;
if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
// An exported function will always be emitted when defined, so even if
// the function is inline, it doesn't have to be emitted in this TU. An
// imported function implies that it has been exported somewhere else.
continue;
}
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
if (FD->isDefined())
continue;
if (FD->isExternallyVisible() &&
!isExternalWithNoLinkageType(FD) &&
!FD->getMostRecentDecl()->isInlined() &&
!FD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
continue;
if (FD->getBuiltinID())
continue;
} else {
auto *VD = cast<VarDecl>(ND);
if (VD->hasDefinition() != VarDecl::DeclarationOnly)
continue;
if (VD->isExternallyVisible() &&
!isExternalWithNoLinkageType(VD) &&
!VD->getMostRecentDecl()->isInline() &&
!VD->hasAttr<ExcludeFromExplicitInstantiationAttr>())
continue;
// Skip VarDecls that lack formal definitions but which we know are in
// fact defined somewhere.
if (VD->isKnownToBeDefined())
continue;
}
Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
}
}
/// checkUndefinedButUsed - Check for undefined objects with internal linkage
/// or that are inline.
static void checkUndefinedButUsed(Sema &S) {
if (S.UndefinedButUsed.empty()) return;
// Collect all the still-undefined entities with internal linkage.
SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
S.getUndefinedButUsed(Undefined);
if (Undefined.empty()) return;
for (const auto &Undef : Undefined) {
ValueDecl *VD = cast<ValueDecl>(Undef.first);
SourceLocation UseLoc = Undef.second;
if (S.isExternalWithNoLinkageType(VD)) {
// C++ [basic.link]p8:
// A type without linkage shall not be used as the type of a variable
// or function with external linkage unless
// -- the entity has C language linkage
// -- the entity is not odr-used or is defined in the same TU
//
// As an extension, accept this in cases where the type is externally
// visible, since the function or variable actually can be defined in
// another translation unit in that case.
S.Diag(VD->getLocation(), isExternallyVisible(VD->getType()->getLinkage())
? diag::ext_undefined_internal_type
: diag::err_undefined_internal_type)
<< isa<VarDecl>(VD) << VD;
} else if (!VD->isExternallyVisible()) {
// FIXME: We can promote this to an error. The function or variable can't
// be defined anywhere else, so the program must necessarily violate the
// one definition rule.
bool IsImplicitBase = false;
if (const auto *BaseD = dyn_cast<FunctionDecl>(VD)) {
auto *DVAttr = BaseD->getAttr<OMPDeclareVariantAttr>();
if (DVAttr && !DVAttr->getTraitInfo().isExtensionActive(
llvm::omp::TraitProperty::
implementation_extension_disable_implicit_base)) {
const auto *Func = cast<FunctionDecl>(
cast<DeclRefExpr>(DVAttr->getVariantFuncRef())->getDecl());
IsImplicitBase = BaseD->isImplicit() &&
Func->getIdentifier()->isMangledOpenMPVariantName();
}
}
if (!S.getLangOpts().OpenMP || !IsImplicitBase)
S.Diag(VD->getLocation(), diag::warn_undefined_internal)
<< isa<VarDecl>(VD) << VD;
} else if (auto *FD = dyn_cast<FunctionDecl>(VD)) {
(void)FD;
assert(FD->getMostRecentDecl()->isInlined() &&
"used object requires definition but isn't inline or internal?");
// FIXME: This is ill-formed; we should reject.
S.Diag(VD->getLocation(), diag::warn_undefined_inline) << VD;
} else {
assert(cast<VarDecl>(VD)->getMostRecentDecl()->isInline() &&
"used var requires definition but isn't inline or internal?");
S.Diag(VD->getLocation(), diag::err_undefined_inline_var) << VD;
}
if (UseLoc.isValid())
S.Diag(UseLoc, diag::note_used_here);
}
S.UndefinedButUsed.clear();
}
void Sema::LoadExternalWeakUndeclaredIdentifiers() {
if (!ExternalSource)
return;
SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
for (auto &WeakID : WeakIDs)
(void)WeakUndeclaredIdentifiers[WeakID.first].insert(WeakID.second);
}
typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
/// Returns true, if all methods and nested classes of the given
/// CXXRecordDecl are defined in this translation unit.
///
/// Should only be called from ActOnEndOfTranslationUnit so that all
/// definitions are actually read.
static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
RecordCompleteMap &MNCComplete) {
RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
if (Cache != MNCComplete.end())
return Cache->second;
if (!RD->isCompleteDefinition())
return false;
bool Complete = true;
for (DeclContext::decl_iterator I = RD->decls_begin(),
E = RD->decls_end();
I != E && Complete; ++I) {
if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
Complete = M->isDefined() || M->isDefaulted() ||
(M->isPure() && !isa<CXXDestructorDecl>(M));
else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
// If the template function is marked as late template parsed at this
// point, it has not been instantiated and therefore we have not
// performed semantic analysis on it yet, so we cannot know if the type
// can be considered complete.
Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
F->getTemplatedDecl()->isDefined();
else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
if (R->isInjectedClassName())
continue;
if (R->hasDefinition())
Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
MNCComplete);
else
Complete = false;
}
}
MNCComplete[RD] = Complete;
return Complete;
}
/// Returns true, if the given CXXRecordDecl is fully defined in this
/// translation unit, i.e. all methods are defined or pure virtual and all
/// friends, friend functions and nested classes are fully defined in this
/// translation unit.
///
/// Should only be called from ActOnEndOfTranslationUnit so that all
/// definitions are actually read.
static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
RecordCompleteMap &RecordsComplete,
RecordCompleteMap &MNCComplete) {
RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
if (Cache != RecordsComplete.end())
return Cache->second;
bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
E = RD->friend_end();
I != E && Complete; ++I) {
// Check if friend classes and methods are complete.
if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
// Friend classes are available as the TypeSourceInfo of the FriendDecl.
if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
else
Complete = false;
} else {