/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST/DeclBase.cpp

Bug Summary

File:	clang/lib/AST/DeclBase.cpp
Warning:	line 1683, column 9 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name DeclBase.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/include -D NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-09-04-040900-46481-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST/DeclBase.cpp
1//===- DeclBase.cpp - Declaration AST Node Implementation -----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Decl and DeclContext classes.
10//
11//===----------------------------------------------------------------------===//

13#include "clang/AST/DeclBase.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/Attr.h"
18#include "clang/AST/AttrIterator.h"
19#include "clang/AST/Decl.h"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclContextInternals.h"
22#include "clang/AST/DeclFriend.h"
23#include "clang/AST/DeclObjC.h"
24#include "clang/AST/DeclOpenMP.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/DependentDiagnostic.h"
27#include "clang/AST/ExternalASTSource.h"
28#include "clang/AST/Stmt.h"
29#include "clang/AST/Type.h"
30#include "clang/Basic/IdentifierTable.h"
31#include "clang/Basic/LLVM.h"
32#include "clang/Basic/LangOptions.h"
33#include "clang/Basic/ObjCRuntime.h"
34#include "clang/Basic/PartialDiagnostic.h"
35#include "clang/Basic/SourceLocation.h"
36#include "clang/Basic/TargetInfo.h"
37#include "llvm/ADT/ArrayRef.h"
38#include "llvm/ADT/PointerIntPair.h"
39#include "llvm/ADT/SmallVector.h"
40#include "llvm/ADT/StringRef.h"
41#include "llvm/Support/Casting.h"
42#include "llvm/Support/ErrorHandling.h"
43#include "llvm/Support/MathExtras.h"
44#include "llvm/Support/VersionTuple.h"
45#include "llvm/Support/raw_ostream.h"
46#include <algorithm>
47#include <cassert>
48#include <cstddef>
49#include <string>
50#include <tuple>
51#include <utility>

53using namespace clang;

55//===----------------------------------------------------------------------===//
56//  Statistics
57//===----------------------------------------------------------------------===//

59#define DECL(DERIVED, BASE) static int n##DERIVED##s = 0;
60#define ABSTRACT_DECL(DECL)
61#include "clang/AST/DeclNodes.inc"

63void Decl::updateOutOfDate(IdentifierInfo &II) const {
getASTContext().getExternalSource()->updateOutOfDateIdentifier(II);
65}

67#define DECL(DERIVED, BASE)                                                    \
static_assert(alignof(Decl) >= alignof(DERIVED##Decl),                       \
              "Alignment sufficient after objects prepended to " #DERIVED);
70#define ABSTRACT_DECL(DECL)
71#include "clang/AST/DeclNodes.inc"

73void *Decl::operator new(std::size_t Size, const ASTContext &Context,
                       unsigned ID, std::size_t Extra) {
// Allocate an extra 8 bytes worth of storage, which ensures that the
// resulting pointer will still be 8-byte aligned.
static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
              "Decl won't be misaligned");
void *Start = Context.Allocate(Size + Extra + 8);
void *Result = (char*)Start + 8;

unsigned *PrefixPtr = (unsigned *)Result - 2;

// Zero out the first 4 bytes; this is used to store the owning module ID.
PrefixPtr[0] = 0;

// Store the global declaration ID in the second 4 bytes.
PrefixPtr[1] = ID;

return Result;
91}

93void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
                       DeclContext *Parent, std::size_t Extra) {
assert(!Parent || &Parent->getParentASTContext() == &Ctx)(static_cast<void> (0));
// With local visibility enabled, we track the owning module even for local
// declarations. We create the TU decl early and may not yet know what the
// LangOpts are, so conservatively allocate the storage.
if (Ctx.getLangOpts().trackLocalOwningModule() || !Parent) {
  // Ensure required alignment of the resulting object by adding extra
  // padding at the start if required.
  size_t ExtraAlign =
      llvm::offsetToAlignment(sizeof(Module *), llvm::Align(alignof(Decl)));
  auto *Buffer = reinterpret_cast<char *>(
      ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx));
  Buffer += ExtraAlign;
  auto *ParentModule =
      Parent ? cast<Decl>(Parent)->getOwningModule() : nullptr;
  return new (Buffer) Module*(ParentModule) + 1;
}
return ::operator new(Size + Extra, Ctx);
112}

114Module *Decl::getOwningModuleSlow() const {
assert(isFromASTFile() && "Not from AST file?")(static_cast<void> (0));
return getASTContext().getExternalSource()->getModule(getOwningModuleID());
117}

119bool Decl::hasLocalOwningModuleStorage() const {
return getASTContext().getLangOpts().trackLocalOwningModule();
121}

123const char *Decl::getDeclKindName() const {
switch (DeclKind) {
default: llvm_unreachable("Declaration not in DeclNodes.inc!")__builtin_unreachable();
126#define DECL(DERIVED, BASE) case DERIVED: return #DERIVED;
127#define ABSTRACT_DECL(DECL)
128#include "clang/AST/DeclNodes.inc"
}
130}

132void Decl::setInvalidDecl(bool Invalid) {
InvalidDecl = Invalid;
assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition())(static_cast<void> (0));
if (!Invalid) {
  return;
}

if (!isa<ParmVarDecl>(this)) {
  // Defensive maneuver for ill-formed code: we're likely not to make it to
  // a point where we set the access specifier, so default it to "public"
  // to avoid triggering asserts elsewhere in the front end.
  setAccess(AS_public);
}

// Marking a DecompositionDecl as invalid implies all the child BindingDecl's
// are invalid too.
if (auto *DD = dyn_cast<DecompositionDecl>(this)) {
  for (auto *Binding : DD->bindings()) {
    Binding->setInvalidDecl();
  }
}
153}

155const char *DeclContext::getDeclKindName() const {
switch (getDeclKind()) {
157#define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED;
158#define ABSTRACT_DECL(DECL)
159#include "clang/AST/DeclNodes.inc"
}
llvm_unreachable("Declaration context not in DeclNodes.inc!")__builtin_unreachable();
162}

164bool Decl::StatisticsEnabled = false;
165void Decl::EnableStatistics() {
StatisticsEnabled = true;
167}

169void Decl::PrintStats() {
llvm::errs() << "\n*** Decl Stats:\n";

int totalDecls = 0;
173#define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s;
174#define ABSTRACT_DECL(DECL)
175#include "clang/AST/DeclNodes.inc"
llvm::errs() << "  " << totalDecls << " decls total.\n";

int totalBytes = 0;
179#define DECL(DERIVED, BASE)                                             \
if (n##DERIVED##s > 0) {                                              \
  totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl));         \
  llvm::errs() << "    " << n##DERIVED##s << " " #DERIVED " decls, "  \
               << sizeof(DERIVED##Decl) << " each ("                  \
               << n##DERIVED##s * sizeof(DERIVED##Decl)               \
               << " bytes)\n";                                        \
}
187#define ABSTRACT_DECL(DECL)
188#include "clang/AST/DeclNodes.inc"

llvm::errs() << "Total bytes = " << totalBytes << "\n";
191}

193void Decl::add(Kind k) {
switch (k) {
195#define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break;
196#define ABSTRACT_DECL(DECL)
197#include "clang/AST/DeclNodes.inc"
}
199}

201bool Decl::isTemplateParameterPack() const {
if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(this))
  return TTP->isParameterPack();
if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(this))
  return NTTP->isParameterPack();
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(this))
  return TTP->isParameterPack();
return false;
209}

211bool Decl::isParameterPack() const {
if (const auto *Var = dyn_cast<VarDecl>(this))
  return Var->isParameterPack();

return isTemplateParameterPack();
216}

218FunctionDecl *Decl::getAsFunction() {
if (auto *FD = dyn_cast<FunctionDecl>(this))
  return FD;
if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
  return FTD->getTemplatedDecl();
return nullptr;
224}

226bool Decl::isTemplateDecl() const {
return isa<TemplateDecl>(this);
228}

230TemplateDecl *Decl::getDescribedTemplate() const {
if (auto *FD = dyn_cast<FunctionDecl>(this))
  return FD->getDescribedFunctionTemplate();
if (auto *RD = dyn_cast<CXXRecordDecl>(this))
  return RD->getDescribedClassTemplate();
if (auto *VD = dyn_cast<VarDecl>(this))
  return VD->getDescribedVarTemplate();
if (auto *AD = dyn_cast<TypeAliasDecl>(this))
  return AD->getDescribedAliasTemplate();

return nullptr;
241}

243const TemplateParameterList *Decl::getDescribedTemplateParams() const {
if (auto *TD = getDescribedTemplate())
  return TD->getTemplateParameters();
if (auto *CTPSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(this))
  return CTPSD->getTemplateParameters();
if (auto *VTPSD = dyn_cast<VarTemplatePartialSpecializationDecl>(this))
  return VTPSD->getTemplateParameters();
return nullptr;
251}

253bool Decl::isTemplated() const {
// A declaration is templated if it is a template or a template pattern, or
// is within (lexcially for a friend, semantically otherwise) a dependent
// context.
// FIXME: Should local extern declarations be treated like friends?
if (auto *AsDC = dyn_cast<DeclContext>(this))
  return AsDC->isDependentContext();
auto *DC = getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext();
return DC->isDependentContext() || isTemplateDecl() ||
       getDescribedTemplateParams();
263}

265unsigned Decl::getTemplateDepth() const {
if (auto *DC = dyn_cast<DeclContext>(this))
  if (DC->isFileContext())
    return 0;

if (auto *TPL = getDescribedTemplateParams())
  return TPL->getDepth() + 1;

// If this is a dependent lambda, there might be an enclosing variable
// template. In this case, the next step is not the parent DeclContext (or
// even a DeclContext at all).
auto *RD = dyn_cast<CXXRecordDecl>(this);
if (RD && RD->isDependentLambda())
  if (Decl *Context = RD->getLambdaContextDecl())
    return Context->getTemplateDepth();

const DeclContext *DC =
    getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext();
return cast<Decl>(DC)->getTemplateDepth();
284}

286const DeclContext *Decl::getParentFunctionOrMethod() const {
for (const DeclContext *DC = getDeclContext();
     DC && !DC->isTranslationUnit() && !DC->isNamespace();
     DC = DC->getParent())
  if (DC->isFunctionOrMethod())
    return DC;

return nullptr;
294}

296//===----------------------------------------------------------------------===//
297// PrettyStackTraceDecl Implementation
298//===----------------------------------------------------------------------===//

300void PrettyStackTraceDecl::print(raw_ostream &OS) const {
SourceLocation TheLoc = Loc;
if (TheLoc.isInvalid() && TheDecl)
  TheLoc = TheDecl->getLocation();

if (TheLoc.isValid()) {
  TheLoc.print(OS, SM);
  OS << ": ";
}

OS << Message;

if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
  OS << " '";
  DN->printQualifiedName(OS);
  OS << '\'';
}
OS << '\n';
318}

320//===----------------------------------------------------------------------===//
321// Decl Implementation
322//===----------------------------------------------------------------------===//

324// Out-of-line virtual method providing a home for Decl.
325Decl::~Decl() = default;

327void Decl::setDeclContext(DeclContext *DC) {
DeclCtx = DC;
329}

331void Decl::setLexicalDeclContext(DeclContext *DC) {
if (DC == getLexicalDeclContext())
  return;

if (isInSemaDC()) {
  setDeclContextsImpl(getDeclContext(), DC, getASTContext());
} else {
  getMultipleDC()->LexicalDC = DC;
}

// FIXME: We shouldn't be changing the lexical context of declarations
// imported from AST files.
if (!isFromASTFile()) {
  setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC));
  if (hasOwningModule())
    setLocalOwningModule(cast<Decl>(DC)->getOwningModule());
}

assert((static_cast<void> (0))
    (getModuleOwnershipKind() != ModuleOwnershipKind::VisibleWhenImported ||(static_cast<void> (0))
     getOwningModule()) &&(static_cast<void> (0))
    "hidden declaration has no owning module")(static_cast<void> (0));
353}

355void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
                             ASTContext &Ctx) {
if (SemaDC == LexicalDC) {
  DeclCtx = SemaDC;
} else {
  auto *MDC = new (Ctx) Decl::MultipleDC();
  MDC->SemanticDC = SemaDC;
  MDC->LexicalDC = LexicalDC;
  DeclCtx = MDC;
}
365}

367bool Decl::isInLocalScopeForInstantiation() const {
const DeclContext *LDC = getLexicalDeclContext();
if (!LDC->isDependentContext())
  return false;
while (true) {
  if (LDC->isFunctionOrMethod())
    return true;
  if (!isa<TagDecl>(LDC))
    return false;
  if (const auto *CRD = dyn_cast<CXXRecordDecl>(LDC))
    if (CRD->isLambda())
      return true;
  LDC = LDC->getLexicalParent();
}
return false;
382}

384bool Decl::isInAnonymousNamespace() const {
for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) {
  if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
    if (ND->isAnonymousNamespace())
      return true;
}

return false;
392}

394bool Decl::isInStdNamespace() const {
const DeclContext *DC = getDeclContext();
return DC && DC->isStdNamespace();
397}

399TranslationUnitDecl *Decl::getTranslationUnitDecl() {
if (auto *TUD = dyn_cast<TranslationUnitDecl>(this))
  return TUD;

DeclContext *DC = getDeclContext();
assert(DC && "This decl is not contained in a translation unit!")(static_cast<void> (0));

while (!DC->isTranslationUnit()) {
  DC = DC->getParent();
  assert(DC && "This decl is not contained in a translation unit!")(static_cast<void> (0));
}

return cast<TranslationUnitDecl>(DC);
412}

414ASTContext &Decl::getASTContext() const {
return getTranslationUnitDecl()->getASTContext();
416}

418/// Helper to get the language options from the ASTContext.
419/// Defined out of line to avoid depending on ASTContext.h.
420const LangOptions &Decl::getLangOpts() const {
return getASTContext().getLangOpts();
422}

424ASTMutationListener *Decl::getASTMutationListener() const {
return getASTContext().getASTMutationListener();
426}

428unsigned Decl::getMaxAlignment() const {
if (!hasAttrs())
  return 0;

unsigned Align = 0;
const AttrVec &V = getAttrs();
ASTContext &Ctx = getASTContext();
specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
for (; I != E; ++I) {
  if (!I->isAlignmentErrorDependent())
    Align = std::max(Align, I->getAlignment(Ctx));
}
return Align;
441}

443bool Decl::isUsed(bool CheckUsedAttr) const {
const Decl *CanonD = getCanonicalDecl();
if (CanonD->Used)
  return true;

// Check for used attribute.
// Ask the most recent decl, since attributes accumulate in the redecl chain.
if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>())
  return true;

// The information may have not been deserialized yet. Force deserialization
// to complete the needed information.
return getMostRecentDecl()->getCanonicalDecl()->Used;
456}

458void Decl::markUsed(ASTContext &C) {
if (isUsed(false))
  return;

if (C.getASTMutationListener())
  C.getASTMutationListener()->DeclarationMarkedUsed(this);

setIsUsed();
466}

468bool Decl::isReferenced() const {
if (Referenced)
  return true;

// Check redeclarations.
for (const auto *I : redecls())
  if (I->Referenced)
    return true;

return false;
478}

480ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
const Decl *Definition = nullptr;
if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) {
  Definition = ID->getDefinition();
} else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) {
  Definition = PD->getDefinition();
} else if (auto *TD = dyn_cast<TagDecl>(this)) {
  Definition = TD->getDefinition();
}
if (!Definition)
  Definition = this;

if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
  return attr;
if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
  return dcd->getAttr<ExternalSourceSymbolAttr>();
}

return nullptr;
499}

501bool Decl::hasDefiningAttr() const {
return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>() ||
       hasAttr<LoaderUninitializedAttr>();
504}

506const Attr *Decl::getDefiningAttr() const {
if (auto *AA = getAttr<AliasAttr>())
  return AA;
if (auto *IFA = getAttr<IFuncAttr>())
  return IFA;
if (auto *NZA = getAttr<LoaderUninitializedAttr>())
  return NZA;
return nullptr;
514}

516static StringRef getRealizedPlatform(const AvailabilityAttr *A,
                                   const ASTContext &Context) {
// Check if this is an App Extension "platform", and if so chop off
// the suffix for matching with the actual platform.
StringRef RealizedPlatform = A->getPlatform()->getName();
if (!Context.getLangOpts().AppExt)
  return RealizedPlatform;
size_t suffix = RealizedPlatform.rfind("_app_extension");
if (suffix != StringRef::npos)
  return RealizedPlatform.slice(0, suffix);
return RealizedPlatform;
527}

529/// Determine the availability of the given declaration based on
530/// the target platform.
531///
532/// When it returns an availability result other than \c AR_Available,
533/// if the \p Message parameter is non-NULL, it will be set to a
534/// string describing why the entity is unavailable.
535///
536/// FIXME: Make these strings localizable, since they end up in
537/// diagnostics.
538static AvailabilityResult CheckAvailability(ASTContext &Context,
                                          const AvailabilityAttr *A,
                                          std::string *Message,
                                          VersionTuple EnclosingVersion) {
if (EnclosingVersion.empty())
  EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion();

if (EnclosingVersion.empty())
  return AR_Available;

StringRef ActualPlatform = A->getPlatform()->getName();
StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();

// Match the platform name.
if (getRealizedPlatform(A, Context) != TargetPlatform)
  return AR_Available;

StringRef PrettyPlatformName
  = AvailabilityAttr::getPrettyPlatformName(ActualPlatform);

if (PrettyPlatformName.empty())
  PrettyPlatformName = ActualPlatform;

std::string HintMessage;
if (!A->getMessage().empty()) {
  HintMessage = " - ";
  HintMessage += A->getMessage();
}

// Make sure that this declaration has not been marked 'unavailable'.
if (A->getUnavailable()) {
  if (Message) {
    Message->clear();
    llvm::raw_string_ostream Out(*Message);
    Out << "not available on " << PrettyPlatformName
        << HintMessage;
  }

  return AR_Unavailable;
}

// Make sure that this declaration has already been introduced.
if (!A->getIntroduced().empty() &&
    EnclosingVersion < A->getIntroduced()) {
  if (Message) {
    Message->clear();
    llvm::raw_string_ostream Out(*Message);
    VersionTuple VTI(A->getIntroduced());
    Out << "introduced in " << PrettyPlatformName << ' '
        << VTI << HintMessage;
  }

  return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced;
}

// Make sure that this declaration hasn't been obsoleted.
if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) {
  if (Message) {
    Message->clear();
    llvm::raw_string_ostream Out(*Message);
    VersionTuple VTO(A->getObsoleted());
    Out << "obsoleted in " << PrettyPlatformName << ' '
        << VTO << HintMessage;
  }

  return AR_Unavailable;
}

// Make sure that this declaration hasn't been deprecated.
if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) {
  if (Message) {
    Message->clear();
    llvm::raw_string_ostream Out(*Message);
    VersionTuple VTD(A->getDeprecated());
    Out << "first deprecated in " << PrettyPlatformName << ' '
        << VTD << HintMessage;
  }

  return AR_Deprecated;
}

return AR_Available;
620}

622AvailabilityResult Decl::getAvailability(std::string *Message,
                                       VersionTuple EnclosingVersion,
                                       StringRef *RealizedPlatform) const {
if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
  return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion,
                                                  RealizedPlatform);

AvailabilityResult Result = AR_Available;
std::string ResultMessage;

for (const auto *A : attrs()) {
  if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) {
    if (Result >= AR_Deprecated)
      continue;

    if (Message)
      ResultMessage = std::string(Deprecated->getMessage());

    Result = AR_Deprecated;
    continue;
  }

  if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) {
    if (Message)
      *Message = std::string(Unavailable->getMessage());
    return AR_Unavailable;
  }

  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
    AvailabilityResult AR = CheckAvailability(getASTContext(), Availability,
                                              Message, EnclosingVersion);

    if (AR == AR_Unavailable) {
      if (RealizedPlatform)
        *RealizedPlatform = Availability->getPlatform()->getName();
      return AR_Unavailable;
    }

    if (AR > Result) {
      Result = AR;
      if (Message)
        ResultMessage.swap(*Message);
    }
    continue;
  }
}

if (Message)
  Message->swap(ResultMessage);
return Result;
672}

674VersionTuple Decl::getVersionIntroduced() const {
const ASTContext &Context = getASTContext();
StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
for (const auto *A : attrs()) {
  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
    if (getRealizedPlatform(Availability, Context) != TargetPlatform)
      continue;
    if (!Availability->getIntroduced().empty())
      return Availability->getIntroduced();
  }
}
return {};
686}

688bool Decl::canBeWeakImported(bool &IsDefinition) const {
IsDefinition = false;

// Variables, if they aren't definitions.
if (const auto *Var = dyn_cast<VarDecl>(this)) {
  if (Var->isThisDeclarationADefinition()) {
    IsDefinition = true;
    return false;
  }
  return true;
}
// Functions, if they aren't definitions.
if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
  if (FD->hasBody()) {
    IsDefinition = true;
    return false;
  }
  return true;

}
// Objective-C classes, if this is the non-fragile runtime.
if (isa<ObjCInterfaceDecl>(this) &&
           getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) {
  return true;
}
// Nothing else.
return false;
715}

717bool Decl::isWeakImported() const {
bool IsDefinition;
if (!canBeWeakImported(IsDefinition))
  return false;

for (const auto *A : getMostRecentDecl()->attrs()) {
  if (isa<WeakImportAttr>(A))
    return true;

  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
    if (CheckAvailability(getASTContext(), Availability, nullptr,
                          VersionTuple()) == AR_NotYetIntroduced)
      return true;
  }
}

return false;
734}

736unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
switch (DeclKind) {
  case Function:
  case CXXDeductionGuide:
  case CXXMethod:
  case CXXConstructor:
  case ConstructorUsingShadow:
  case CXXDestructor:
  case CXXConversion:
  case EnumConstant:
  case Var:
  case ImplicitParam:
  case ParmVar:
  case ObjCMethod:
  case ObjCProperty:
  case MSProperty:
    return IDNS_Ordinary;
  case Label:
    return IDNS_Label;
  case IndirectField:
    return IDNS_Ordinary | IDNS_Member;

  case Binding:
  case NonTypeTemplateParm:
  case VarTemplate:
  case Concept:
    // These (C++-only) declarations are found by redeclaration lookup for
    // tag types, so we include them in the tag namespace.
    return IDNS_Ordinary | IDNS_Tag;

  case ObjCCompatibleAlias:
  case ObjCInterface:
    return IDNS_Ordinary | IDNS_Type;

  case Typedef:
  case TypeAlias:
  case TemplateTypeParm:
  case ObjCTypeParam:
    return IDNS_Ordinary | IDNS_Type;

  case UnresolvedUsingTypename:
    return IDNS_Ordinary | IDNS_Type | IDNS_Using;

  case UsingShadow:
    return 0; // we'll actually overwrite this later

  case UnresolvedUsingValue:
    return IDNS_Ordinary | IDNS_Using;

  case Using:
  case UsingPack:
  case UsingEnum:
    return IDNS_Using;

  case ObjCProtocol:
    return IDNS_ObjCProtocol;

  case Field:
  case ObjCAtDefsField:
  case ObjCIvar:
    return IDNS_Member;

  case Record:
  case CXXRecord:
  case Enum:
    return IDNS_Tag | IDNS_Type;

  case Namespace:
  case NamespaceAlias:
    return IDNS_Namespace;

  case FunctionTemplate:
    return IDNS_Ordinary;

  case ClassTemplate:
  case TemplateTemplateParm:
  case TypeAliasTemplate:
    return IDNS_Ordinary | IDNS_Tag | IDNS_Type;

  case UnresolvedUsingIfExists:
    return IDNS_Type | IDNS_Ordinary;

  case OMPDeclareReduction:
    return IDNS_OMPReduction;

  case OMPDeclareMapper:
    return IDNS_OMPMapper;

  // Never have names.
  case Friend:
  case FriendTemplate:
  case AccessSpec:
  case LinkageSpec:
  case Export:
  case FileScopeAsm:
  case StaticAssert:
  case ObjCPropertyImpl:
  case PragmaComment:
  case PragmaDetectMismatch:
  case Block:
  case Captured:
  case TranslationUnit:
  case ExternCContext:
  case Decomposition:
  case MSGuid:
  case TemplateParamObject:

  case UsingDirective:
  case BuiltinTemplate:
  case ClassTemplateSpecialization:
  case ClassTemplatePartialSpecialization:
  case ClassScopeFunctionSpecialization:
  case VarTemplateSpecialization:
  case VarTemplatePartialSpecialization:
  case ObjCImplementation:
  case ObjCCategory:
  case ObjCCategoryImpl:
  case Import:
  case OMPThreadPrivate:
  case OMPAllocate:
  case OMPRequires:
  case OMPCapturedExpr:
  case Empty:
  case LifetimeExtendedTemporary:
  case RequiresExprBody:
    // Never looked up by name.
    return 0;
}

llvm_unreachable("Invalid DeclKind!")__builtin_unreachable();
866}

868void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) {
assert(!HasAttrs && "Decl already contains attrs.")(static_cast<void> (0));

AttrVec &AttrBlank = Ctx.getDeclAttrs(this);
assert(AttrBlank.empty() && "HasAttrs was wrong?")(static_cast<void> (0));

AttrBlank = attrs;
HasAttrs = true;
876}

878void Decl::dropAttrs() {
if (!HasAttrs) return;

HasAttrs = false;
getASTContext().eraseDeclAttrs(this);
883}

885void Decl::addAttr(Attr *A) {
if (!hasAttrs()) {
  setAttrs(AttrVec(1, A));
  return;
}

AttrVec &Attrs = getAttrs();
if (!A->isInherited()) {
  Attrs.push_back(A);
  return;
}

// Attribute inheritance is processed after attribute parsing. To keep the
// order as in the source code, add inherited attributes before non-inherited
// ones.
auto I = Attrs.begin(), E = Attrs.end();
for (; I != E; ++I) {
  if (!(*I)->isInherited())
    break;
}
Attrs.insert(I, A);
906}

908const AttrVec &Decl::getAttrs() const {
assert(HasAttrs && "No attrs to get!")(static_cast<void> (0));
return getASTContext().getDeclAttrs(this);
911}

913Decl *Decl::castFromDeclContext (const DeclContext *D) {
Decl::Kind DK = D->getDeclKind();
switch(DK) {
916#define DECL(NAME, BASE)
917#define DECL_CONTEXT(NAME) \
  case Decl::NAME:       \
    return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
920#define DECL_CONTEXT_BASE(NAME)
921#include "clang/AST/DeclNodes.inc"
  default:
923#define DECL(NAME, BASE)
924#define DECL_CONTEXT_BASE(NAME)                  \
    if (DK >= first##NAME && DK <= last##NAME) \
      return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
927#include "clang/AST/DeclNodes.inc"
    llvm_unreachable("a decl that inherits DeclContext isn't handled")__builtin_unreachable();
}
930}

932DeclContext *Decl::castToDeclContext(const Decl *D) {
Decl::Kind DK = D->getKind();
switch(DK) {
935#define DECL(NAME, BASE)
936#define DECL_CONTEXT(NAME) \
  case Decl::NAME:       \
    return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
939#define DECL_CONTEXT_BASE(NAME)
940#include "clang/AST/DeclNodes.inc"
  default:
942#define DECL(NAME, BASE)
943#define DECL_CONTEXT_BASE(NAME)                                   \
    if (DK >= first##NAME && DK <= last##NAME)                  \
      return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
946#include "clang/AST/DeclNodes.inc"
    llvm_unreachable("a decl that inherits DeclContext isn't handled")__builtin_unreachable();
}
949}

951SourceLocation Decl::getBodyRBrace() const {
// Special handling of FunctionDecl to avoid de-serializing the body from PCH.
// FunctionDecl stores EndRangeLoc for this purpose.
if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
  const FunctionDecl *Definition;
  if (FD->hasBody(Definition))
    return Definition->getSourceRange().getEnd();
  return {};
}

if (Stmt *Body = getBody())
  return Body->getSourceRange().getEnd();

return {};
965}

967bool Decl::AccessDeclContextSanity() const {
968#ifndef NDEBUG1
// Suppress this check if any of the following hold:
// 1. this is the translation unit (and thus has no parent)
// 2. this is a template parameter (and thus doesn't belong to its context)
// 3. this is a non-type template parameter
// 4. the context is not a record
// 5. it's invalid
// 6. it's a C++0x static_assert.
// 7. it's a block literal declaration
// 8. it's a temporary with lifetime extended due to being default value.
if (isa<TranslationUnitDecl>(this) || isa<TemplateTypeParmDecl>(this) ||
    isa<NonTypeTemplateParmDecl>(this) || !getDeclContext() ||
    !isa<CXXRecordDecl>(getDeclContext()) || isInvalidDecl() ||
    isa<StaticAssertDecl>(this) || isa<BlockDecl>(this) ||
    // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
    // as DeclContext (?).
    isa<ParmVarDecl>(this) ||
    // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
    // AS_none as access specifier.
    isa<CXXRecordDecl>(this) ||
    isa<ClassScopeFunctionSpecializationDecl>(this) ||
    isa<LifetimeExtendedTemporaryDecl>(this))
  return true;

assert(Access != AS_none &&(static_cast<void> (0))
       "Access specifier is AS_none inside a record decl")(static_cast<void> (0));
994#endif
return true;
996}

998static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
999static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }

1001int64_t Decl::getID() const {
return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this);
1003}

1005const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
QualType Ty;
if (const auto *D = dyn_cast<ValueDecl>(this))
  Ty = D->getType();
else if (const auto *D = dyn_cast<TypedefNameDecl>(this))
  Ty = D->getUnderlyingType();
else
  return nullptr;

if (Ty->isFunctionPointerType())
  Ty = Ty->castAs<PointerType>()->getPointeeType();
else if (Ty->isFunctionReferenceType())
  Ty = Ty->castAs<ReferenceType>()->getPointeeType();
else if (BlocksToo && Ty->isBlockPointerType())
  Ty = Ty->castAs<BlockPointerType>()->getPointeeType();

return Ty->getAs<FunctionType>();
1022}

1024/// Starting at a given context (a Decl or DeclContext), look for a
1025/// code context that is not a closure (a lambda, block, etc.).
1026template <class T> static Decl *getNonClosureContext(T *D) {
if (getKind(D) == Decl::CXXMethod) {
  auto *MD = cast<CXXMethodDecl>(D);
  if (MD->getOverloadedOperator() == OO_Call &&
      MD->getParent()->isLambda())
    return getNonClosureContext(MD->getParent()->getParent());
  return MD;
}
if (auto *FD = dyn_cast<FunctionDecl>(D))
  return FD;
if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
  return MD;
if (auto *BD = dyn_cast<BlockDecl>(D))
  return getNonClosureContext(BD->getParent());
if (auto *CD = dyn_cast<CapturedDecl>(D))
  return getNonClosureContext(CD->getParent());
return nullptr;
1043}

1045Decl *Decl::getNonClosureContext() {
return ::getNonClosureContext(this);
1047}

1049Decl *DeclContext::getNonClosureAncestor() {
return ::getNonClosureContext(this);
1051}

1053//===----------------------------------------------------------------------===//
1054// DeclContext Implementation
1055//===----------------------------------------------------------------------===//

1057DeclContext::DeclContext(Decl::Kind K) {
DeclContextBits.DeclKind = K;
setHasExternalLexicalStorage(false);
setHasExternalVisibleStorage(false);
setNeedToReconcileExternalVisibleStorage(false);
setHasLazyLocalLexicalLookups(false);
setHasLazyExternalLexicalLookups(false);
setUseQualifiedLookup(false);
1065}

1067bool DeclContext::classof(const Decl *D) {
switch (D->getKind()) {
1069#define DECL(NAME, BASE)
1070#define DECL_CONTEXT(NAME) case Decl::NAME:
1071#define DECL_CONTEXT_BASE(NAME)
1072#include "clang/AST/DeclNodes.inc"
    return true;
  default:
1075#define DECL(NAME, BASE)
1076#define DECL_CONTEXT_BASE(NAME)                 \
    if (D->getKind() >= Decl::first##NAME &&  \
        D->getKind() <= Decl::last##NAME)     \
      return true;
1080#include "clang/AST/DeclNodes.inc"
    return false;
}
1083}

1085DeclContext::~DeclContext() = default;

1087/// Find the parent context of this context that will be
1088/// used for unqualified name lookup.
1089///
1090/// Generally, the parent lookup context is the semantic context. However, for
1091/// a friend function the parent lookup context is the lexical context, which
1092/// is the class in which the friend is declared.
1093DeclContext *DeclContext::getLookupParent() {
// FIXME: Find a better way to identify friends.
if (isa<FunctionDecl>(this))
  if (getParent()->getRedeclContext()->isFileContext() &&
      getLexicalParent()->getRedeclContext()->isRecord())
    return getLexicalParent();

// A lookup within the call operator of a lambda never looks in the lambda
// class; instead, skip to the context in which that closure type is
// declared.
if (isLambdaCallOperator(this))
  return getParent()->getParent();

return getParent();
1107}

1109const BlockDecl *DeclContext::getInnermostBlockDecl() const {
const DeclContext *Ctx = this;

do {
  if (Ctx->isClosure())
    return cast<BlockDecl>(Ctx);
  Ctx = Ctx->getParent();
} while (Ctx);

return nullptr;
1119}

1121bool DeclContext::isInlineNamespace() const {
return isNamespace() &&
       cast<NamespaceDecl>(this)->isInline();
1124}

1126bool DeclContext::isStdNamespace() const {
if (!isNamespace())
  return false;

const auto *ND = cast<NamespaceDecl>(this);
if (ND->isInline()) {
  return ND->getParent()->isStdNamespace();
}

if (!getParent()->getRedeclContext()->isTranslationUnit())
  return false;

const IdentifierInfo *II = ND->getIdentifier();
return II && II->isStr("std");
1140}

1142bool DeclContext::isDependentContext() const {
if (isFileContext())
  return false;

if (isa<ClassTemplatePartialSpecializationDecl>(this))
  return true;

if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) {
  if (Record->getDescribedClassTemplate())
    return true;

  if (Record->isDependentLambda())
    return true;
}

if (const auto *Function = dyn_cast<FunctionDecl>(this)) {
  if (Function->getDescribedFunctionTemplate())
    return true;

  // Friend function declarations are dependent if their *lexical*
  // context is dependent.
  if (cast<Decl>(this)->getFriendObjectKind())
    return getLexicalParent()->isDependentContext();
}

// FIXME: A variable template is a dependent context, but is not a
// DeclContext. A context within it (such as a lambda-expression)
// should be considered dependent.

return getParent() && getParent()->isDependentContext();
1172}

1174bool DeclContext::isTransparentContext() const {
if (getDeclKind() == Decl::Enum)
  return !cast<EnumDecl>(this)->isScoped();

return getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export;
1179}

1181static bool isLinkageSpecContext(const DeclContext *DC,
                               LinkageSpecDecl::LanguageIDs ID) {
while (DC->getDeclKind() != Decl::TranslationUnit) {
  if (DC->getDeclKind() == Decl::LinkageSpec)
    return cast<LinkageSpecDecl>(DC)->getLanguage() == ID;
  DC = DC->getLexicalParent();
}
return false;
1189}

1191bool DeclContext::isExternCContext() const {
return isLinkageSpecContext(this, LinkageSpecDecl::lang_c);
1193}

1195const LinkageSpecDecl *DeclContext::getExternCContext() const {
const DeclContext *DC = this;
while (DC->getDeclKind() != Decl::TranslationUnit) {
  if (DC->getDeclKind() == Decl::LinkageSpec &&
      cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c)
    return cast<LinkageSpecDecl>(DC);
  DC = DC->getLexicalParent();
}
return nullptr;
1204}

1206bool DeclContext::isExternCXXContext() const {
return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx);
1208}

1210bool DeclContext::Encloses(const DeclContext *DC) const {
if (getPrimaryContext() != this)
  return getPrimaryContext()->Encloses(DC);

for (; DC; DC = DC->getParent())
  if (DC->getPrimaryContext() == this)
    return true;
return false;
1218}

1220DeclContext *DeclContext::getNonTransparentContext() {
DeclContext *DC = this;
while (DC->isTransparentContext()) {
  DC = DC->getParent();
  assert(DC && "All transparent contexts should have a parent!")(static_cast<void> (0));
}
return DC;
1227}

1229DeclContext *DeclContext::getPrimaryContext() {
switch (getDeclKind()) {
case Decl::ExternCContext:
case Decl::LinkageSpec:
case Decl::Export:
case Decl::Block:
case Decl::Captured:
case Decl::OMPDeclareReduction:
case Decl::OMPDeclareMapper:
case Decl::RequiresExprBody:
  // There is only one DeclContext for these entities.
  return this;

case Decl::TranslationUnit:
  return static_cast<TranslationUnitDecl *>(this)->getFirstDecl();
case Decl::Namespace:
  // The original namespace is our primary context.
  return static_cast<NamespaceDecl *>(this)->getOriginalNamespace();

case Decl::ObjCMethod:
  return this;

case Decl::ObjCInterface:
  if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this))
    if (auto *Def = OID->getDefinition())
      return Def;
  return this;

case Decl::ObjCProtocol:
  if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this))
    if (auto *Def = OPD->getDefinition())
      return Def;
  return this;

case Decl::ObjCCategory:
  return this;

case Decl::ObjCImplementation:
case Decl::ObjCCategoryImpl:
  return this;

default:
  if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) {
    // If this is a tag type that has a definition or is currently
    // being defined, that definition is our primary context.
    auto *Tag = cast<TagDecl>(this);

    if (TagDecl *Def = Tag->getDefinition())
      return Def;

    if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) {
      // Note, TagType::getDecl returns the (partial) definition one exists.
      TagDecl *PossiblePartialDef = TagTy->getDecl();
      if (PossiblePartialDef->isBeingDefined())
        return PossiblePartialDef;
    } else {
      assert(isa<InjectedClassNameType>(Tag->getTypeForDecl()))(static_cast<void> (0));
    }

    return Tag;
  }

  assert(getDeclKind() >= Decl::firstFunction &&(static_cast<void> (0))
         getDeclKind() <= Decl::lastFunction &&(static_cast<void> (0))
        "Unknown DeclContext kind")(static_cast<void> (0));
  return this;
}
1296}

1298template <typename T>
1299void collectAllContextsImpl(T *Self, SmallVectorImpl<DeclContext *> &Contexts) {
for (T *D = Self->getMostRecentDecl(); D; D = D->getPreviousDecl())
  Contexts.push_back(D);

std::reverse(Contexts.begin(), Contexts.end());
1304}

1306void DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts) {
Contexts.clear();

Decl::Kind Kind = getDeclKind();

if (Kind == Decl::TranslationUnit)
  collectAllContextsImpl(static_cast<TranslationUnitDecl *>(this), Contexts);
else if (Kind == Decl::Namespace)
  collectAllContextsImpl(static_cast<NamespaceDecl *>(this), Contexts);
else
  Contexts.push_back(this);
1317}

1319std::pair<Decl *, Decl *>
1320DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls,
                          bool FieldsAlreadyLoaded) {
// Build up a chain of declarations via the Decl::NextInContextAndBits field.
Decl *FirstNewDecl = nullptr;
Decl *PrevDecl = nullptr;
for (auto *D : Decls) {
  if (FieldsAlreadyLoaded && isa<FieldDecl>(D))
    continue;

  if (PrevDecl)
    PrevDecl->NextInContextAndBits.setPointer(D);
  else
    FirstNewDecl = D;

  PrevDecl = D;
}

return std::make_pair(FirstNewDecl, PrevDecl);
1338}

1340/// We have just acquired external visible storage, and we already have
1341/// built a lookup map. For every name in the map, pull in the new names from
1342/// the external storage.
1343void DeclContext::reconcileExternalVisibleStorage() const {
assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr)(static_cast<void> (0));
setNeedToReconcileExternalVisibleStorage(false);

for (auto &Lookup : *LookupPtr)
  Lookup.second.setHasExternalDecls();
1349}

1351/// Load the declarations within this lexical storage from an
1352/// external source.
1353/// \return \c true if any declarations were added.
1354bool
1355DeclContext::LoadLexicalDeclsFromExternalStorage() const {
ExternalASTSource *Source = getParentASTContext().getExternalSource();
assert(hasExternalLexicalStorage() && Source && "No external storage?")(static_cast<void> (0));

// Notify that we have a DeclContext that is initializing.
ExternalASTSource::Deserializing ADeclContext(Source);

// Load the external declarations, if any.
SmallVector<Decl*, 64> Decls;
setHasExternalLexicalStorage(false);
Source->FindExternalLexicalDecls(this, Decls);

if (Decls.empty())
  return false;

// We may have already loaded just the fields of this record, in which case
// we need to ignore them.
bool FieldsAlreadyLoaded = false;
if (const auto *RD = dyn_cast<RecordDecl>(this))
  FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage();

// Splice the newly-read declarations into the beginning of the list
// of declarations.
Decl *ExternalFirst, *ExternalLast;
std::tie(ExternalFirst, ExternalLast) =
    BuildDeclChain(Decls, FieldsAlreadyLoaded);
ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
FirstDecl = ExternalFirst;
if (!LastDecl)
  LastDecl = ExternalLast;
return true;
1386}

1388DeclContext::lookup_result
1389ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC,
                                                  DeclarationName Name) {
ASTContext &Context = DC->getParentASTContext();
StoredDeclsMap *Map;
if (!(Map = DC->LookupPtr))
  Map = DC->CreateStoredDeclsMap(Context);
if (DC->hasNeedToReconcileExternalVisibleStorage())
  DC->reconcileExternalVisibleStorage();

(*Map)[Name].removeExternalDecls();

return DeclContext::lookup_result();
1401}

1403DeclContext::lookup_result
1404ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC,
                                                DeclarationName Name,
                                                ArrayRef<NamedDecl*> Decls) {
ASTContext &Context = DC->getParentASTContext();
StoredDeclsMap *Map;
if (!(Map = DC->LookupPtr))
  Map = DC->CreateStoredDeclsMap(Context);
if (DC->hasNeedToReconcileExternalVisibleStorage())
  DC->reconcileExternalVisibleStorage();

StoredDeclsList &List = (*Map)[Name];
List.replaceExternalDecls(Decls);
return List.getLookupResult();
1417}

1419DeclContext::decl_iterator DeclContext::decls_begin() const {
if (hasExternalLexicalStorage())
  LoadLexicalDeclsFromExternalStorage();
return decl_iterator(FirstDecl);
1423}

1425bool DeclContext::decls_empty() const {
if (hasExternalLexicalStorage())
  LoadLexicalDeclsFromExternalStorage();

return !FirstDecl;
1430}

1432bool DeclContext::containsDecl(Decl *D) const {
return (D->getLexicalDeclContext() == this &&
        (D->NextInContextAndBits.getPointer() || D == LastDecl));
1435}

1437bool DeclContext::containsDeclAndLoad(Decl *D) const {
if (hasExternalLexicalStorage())
  LoadLexicalDeclsFromExternalStorage();
return containsDecl(D);
1441}

1443/// shouldBeHidden - Determine whether a declaration which was declared
1444/// within its semantic context should be invisible to qualified name lookup.
1445static bool shouldBeHidden(NamedDecl *D) {
// Skip unnamed declarations.
if (!D->getDeclName())
  return true;

// Skip entities that can't be found by name lookup into a particular
// context.
if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) ||
    D->isTemplateParameter())
  return true;

// Skip friends and local extern declarations unless they're the first
// declaration of the entity.
if ((D->isLocalExternDecl() || D->getFriendObjectKind()) &&
    D != D->getCanonicalDecl())
  return true;

// Skip template specializations.
// FIXME: This feels like a hack. Should DeclarationName support
// template-ids, or is there a better way to keep specializations
// from being visible?
if (isa<ClassTemplateSpecializationDecl>(D))
  return true;
if (auto *FD = dyn_cast<FunctionDecl>(D))
  if (FD->isFunctionTemplateSpecialization())
    return true;

// Hide destructors that are invalid. There should always be one destructor,
// but if it is an invalid decl, another one is created. We need to hide the
// invalid one from places that expect exactly one destructor, like the
// serialization code.
if (isa<CXXDestructorDecl>(D) && D->isInvalidDecl())
  return true;

return false;
1480}

1482void DeclContext::removeDecl(Decl *D) {
assert(D->getLexicalDeclContext() == this &&(static_cast<void> (0))
       "decl being removed from non-lexical context")(static_cast<void> (0));
assert((D->NextInContextAndBits.getPointer() || D == LastDecl) &&(static_cast<void> (0))
       "decl is not in decls list")(static_cast<void> (0));

// Remove D from the decl chain.  This is O(n) but hopefully rare.
if (D == FirstDecl) {
  if (D == LastDecl)
    FirstDecl = LastDecl = nullptr;
  else
    FirstDecl = D->NextInContextAndBits.getPointer();
} else {
  for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) {
    assert(I && "decl not found in linked list")(static_cast<void> (0));
    if (I->NextInContextAndBits.getPointer() == D) {
      I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer());
      if (D == LastDecl) LastDecl = I;
      break;
    }
  }
}

// Mark that D is no longer in the decl chain.
D->NextInContextAndBits.setPointer(nullptr);

// Remove D from the lookup table if necessary.
if (isa<NamedDecl>(D)) {
  auto *ND = cast<NamedDecl>(D);

  // Do not try to remove the declaration if that is invisible to qualified
  // lookup.  E.g. template specializations are skipped.
  if (shouldBeHidden(ND))
    return;

  // Remove only decls that have a name
  if (!ND->getDeclName())
    return;

  auto *DC = D->getDeclContext();
  do {
    StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr;
    if (Map) {
      StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName());
      assert(Pos != Map->end() && "no lookup entry for decl")(static_cast<void> (0));
      Pos->second.remove(ND);
    }
  } while (DC->isTransparentContext() && (DC = DC->getParent()));
}
1531}

1533void DeclContext::addHiddenDecl(Decl *D) {
assert(D->getLexicalDeclContext() == this &&(static_cast<void> (0))
       "Decl inserted into wrong lexical context")(static_cast<void> (0));
assert(!D->getNextDeclInContext() && D != LastDecl &&(static_cast<void> (0))
       "Decl already inserted into a DeclContext")(static_cast<void> (0));

if (FirstDecl) {
  LastDecl->NextInContextAndBits.setPointer(D);
  LastDecl = D;
} else {
  FirstDecl = LastDecl = D;
}

// Notify a C++ record declaration that we've added a member, so it can
// update its class-specific state.
if (auto *Record = dyn_cast<CXXRecordDecl>(this))
  Record->addedMember(D);

// If this is a newly-created (not de-serialized) import declaration, wire
// it in to the list of local import declarations.
if (!D->isFromASTFile()) {
  if (auto *Import = dyn_cast<ImportDecl>(D))
    D->getASTContext().addedLocalImportDecl(Import);
}
1557}

1559void DeclContext::addDecl(Decl *D) {
addHiddenDecl(D);

if (auto *ND = dyn_cast<NamedDecl>(D))
  ND->getDeclContext()->getPrimaryContext()->
      makeDeclVisibleInContextWithFlags(ND, false, true);
1565}

1567void DeclContext::addDeclInternal(Decl *D) {
addHiddenDecl(D);

if (auto *ND = dyn_cast<NamedDecl>(D))
  ND->getDeclContext()->getPrimaryContext()->
      makeDeclVisibleInContextWithFlags(ND, true, true);
1573}

1575/// buildLookup - Build the lookup data structure with all of the
1576/// declarations in this DeclContext (and any other contexts linked
1577/// to it or transparent contexts nested within it) and return it.
1578///
1579/// Note that the produced map may miss out declarations from an
1580/// external source. If it does, those entries will be marked with
1581/// the 'hasExternalDecls' flag.
1582StoredDeclsMap *DeclContext::buildLookup() {
assert(this == getPrimaryContext() && "buildLookup called on non-primary DC")(static_cast<void> (0));

if (!hasLazyLocalLexicalLookups() &&
    !hasLazyExternalLexicalLookups())
  return LookupPtr;

SmallVector<DeclContext *, 2> Contexts;
collectAllContexts(Contexts);

if (hasLazyExternalLexicalLookups()) {
  setHasLazyExternalLexicalLookups(false);
  for (auto *DC : Contexts) {
    if (DC->hasExternalLexicalStorage()) {
      bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage();
      setHasLazyLocalLexicalLookups(
          hasLazyLocalLexicalLookups() | LoadedDecls );
    }
  }

  if (!hasLazyLocalLexicalLookups())
    return LookupPtr;
}

for (auto *DC : Contexts)
  buildLookupImpl(DC, hasExternalVisibleStorage());

// We no longer have any lazy decls.
setHasLazyLocalLexicalLookups(false);
return LookupPtr;
1612}

1614/// buildLookupImpl - Build part of the lookup data structure for the
1615/// declarations contained within DCtx, which will either be this
1616/// DeclContext, a DeclContext linked to it, or a transparent context
1617/// nested within it.
1618void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) {
for (auto *D : DCtx->noload_decls()) {
  // Insert this declaration into the lookup structure, but only if
  // it's semantically within its decl context. Any other decls which
  // should be found in this context are added eagerly.
  //
  // If it's from an AST file, don't add it now. It'll get handled by
  // FindExternalVisibleDeclsByName if needed. Exception: if we're not
  // in C++, we do not track external visible decls for the TU, so in
  // that case we need to collect them all here.
  if (auto *ND = dyn_cast<NamedDecl>(D))
    if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) &&
        (!ND->isFromASTFile() ||
         (isTranslationUnit() &&
          !getParentASTContext().getLangOpts().CPlusPlus)))
      makeDeclVisibleInContextImpl(ND, Internal);

  // If this declaration is itself a transparent declaration context
  // or inline namespace, add the members of this declaration of that
  // context (recursively).
  if (auto *InnerCtx = dyn_cast<DeclContext>(D))
    if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace())
      buildLookupImpl(InnerCtx, Internal);
}
1642}

1644DeclContext::lookup_result
1645DeclContext::lookup(DeclarationName Name) const {
assert(getDeclKind() != Decl::LinkageSpec &&(static_cast<void> (0))
       getDeclKind() != Decl::Export &&(static_cast<void> (0))
       "should not perform lookups into transparent contexts")(static_cast<void> (0));

const DeclContext *PrimaryContext = getPrimaryContext();
if (PrimaryContext != this)
5
←
Assuming the condition is false→
6
←
Taking false branch→
  return PrimaryContext->lookup(Name);

// If we have an external source, ensure that any later redeclarations of this
// context have been loaded, since they may add names to the result of this
// lookup (or add external visible storage).
ExternalASTSource *Source = getParentASTContext().getExternalSource();
7
←
'Source' initialized here→
if (Source)
8
←
Assuming 'Source' is null→
9
←
Taking false branch→
  (void)cast<Decl>(this)->getMostRecentDecl();

if (hasExternalVisibleStorage()) {
10
←
Assuming the condition is true→
11
←
Taking true branch→
  assert(Source && "external visible storage but no external source?")(static_cast<void> (0));

  if (hasNeedToReconcileExternalVisibleStorage())
12
←
Assuming the condition is false→
13
←
Taking false branch→
    reconcileExternalVisibleStorage();

  StoredDeclsMap *Map = LookupPtr;

  if (hasLazyLocalLexicalLookups() ||
14
←
Assuming the condition is false→
16
←
Taking false branch→
      hasLazyExternalLexicalLookups())
15
←
Assuming the condition is false→
    // FIXME: Make buildLookup const?
    Map = const_cast<DeclContext*>(this)->buildLookup();

  if (!Map)
17
←
Assuming 'Map' is non-null→
18
←
Taking false branch→
    Map = CreateStoredDeclsMap(getParentASTContext());

  // If we have a lookup result with no external decls, we are done.
  std::pair<StoredDeclsMap::iterator, bool> R =
      Map->insert(std::make_pair(Name, StoredDeclsList()));
  if (!R.second && !R.first->second.hasExternalDecls())
19
←
Assuming field 'second' is true→
    return R.first->second.getLookupResult();

  if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) {
20
←
Called C++ object pointer is null
    if (StoredDeclsMap *Map = LookupPtr) {
      StoredDeclsMap::iterator I = Map->find(Name);
      if (I != Map->end())
        return I->second.getLookupResult();
    }
  }

  return {};
}

StoredDeclsMap *Map = LookupPtr;
if (hasLazyLocalLexicalLookups() ||
    hasLazyExternalLexicalLookups())
  Map = const_cast<DeclContext*>(this)->buildLookup();

if (!Map)
  return {};

StoredDeclsMap::iterator I = Map->find(Name);
if (I == Map->end())
  return {};

return I->second.getLookupResult();
1707}

1709DeclContext::lookup_result
1710DeclContext::noload_lookup(DeclarationName Name) {
assert(getDeclKind() != Decl::LinkageSpec &&(static_cast<void> (0))
       getDeclKind() != Decl::Export &&(static_cast<void> (0))
       "should not perform lookups into transparent contexts")(static_cast<void> (0));

DeclContext *PrimaryContext = getPrimaryContext();
if (PrimaryContext != this)
  return PrimaryContext->noload_lookup(Name);

loadLazyLocalLexicalLookups();
StoredDeclsMap *Map = LookupPtr;
if (!Map)
  return {};

StoredDeclsMap::iterator I = Map->find(Name);
return I != Map->end() ? I->second.getLookupResult()
                       : lookup_result();
1727}

1729// If we have any lazy lexical declarations not in our lookup map, add them
1730// now. Don't import any external declarations, not even if we know we have
1731// some missing from the external visible lookups.
1732void DeclContext::loadLazyLocalLexicalLookups() {
if (hasLazyLocalLexicalLookups()) {
  SmallVector<DeclContext *, 2> Contexts;
  collectAllContexts(Contexts);
  for (auto *Context : Contexts)
    buildLookupImpl(Context, hasExternalVisibleStorage());
  setHasLazyLocalLexicalLookups(false);
}
1740}

1742void DeclContext::localUncachedLookup(DeclarationName Name,
                                    SmallVectorImpl<NamedDecl *> &Results) {
Results.clear();

// If there's no external storage, just perform a normal lookup and copy
// the results.
if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) {
1
Assuming the condition is true→
2
←
Assuming the condition is true→
3
←
Taking true branch→
  lookup_result LookupResults = lookup(Name);
4
←
Calling 'DeclContext::lookup'→
  Results.insert(Results.end(), LookupResults.begin(), LookupResults.end());
  return;
}

// If we have a lookup table, check there first. Maybe we'll get lucky.
// FIXME: Should we be checking these flags on the primary context?
if (Name && !hasLazyLocalLexicalLookups() &&
    !hasLazyExternalLexicalLookups()) {
  if (StoredDeclsMap *Map = LookupPtr) {
    StoredDeclsMap::iterator Pos = Map->find(Name);
    if (Pos != Map->end()) {
      Results.insert(Results.end(),
                     Pos->second.getLookupResult().begin(),
                     Pos->second.getLookupResult().end());
      return;
    }
  }
}

// Slow case: grovel through the declarations in our chain looking for
// matches.
// FIXME: If we have lazy external declarations, this will not find them!
// FIXME: Should we CollectAllContexts and walk them all here?
for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) {
  if (auto *ND = dyn_cast<NamedDecl>(D))
    if (ND->getDeclName() == Name)
      Results.push_back(ND);
}
1778}

1780DeclContext *DeclContext::getRedeclContext() {
DeclContext *Ctx = this;

// In C, a record type is the redeclaration context for its fields only. If
// we arrive at a record context after skipping anything else, we should skip
// the record as well. Currently, this means skipping enumerations because
// they're the only transparent context that can exist within a struct or
// union.
bool SkipRecords = getDeclKind() == Decl::Kind::Enum &&
                   !getParentASTContext().getLangOpts().CPlusPlus;

// Skip through contexts to get to the redeclaration context. Transparent
// contexts are always skipped.
while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext())
  Ctx = Ctx->getParent();
return Ctx;
1796}

1798DeclContext *DeclContext::getEnclosingNamespaceContext() {
DeclContext *Ctx = this;
// Skip through non-namespace, non-translation-unit contexts.
while (!Ctx->isFileContext())
  Ctx = Ctx->getParent();
return Ctx->getPrimaryContext();
1804}

1806RecordDecl *DeclContext::getOuterLexicalRecordContext() {
// Loop until we find a non-record context.
RecordDecl *OutermostRD = nullptr;
DeclContext *DC = this;
while (DC->isRecord()) {
  OutermostRD = cast<RecordDecl>(DC);
  DC = DC->getLexicalParent();
}
return OutermostRD;
1815}

1817bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const {
// For non-file contexts, this is equivalent to Equals.
if (!isFileContext())
  return O->Equals(this);

do {
  if (O->Equals(this))
    return true;

  const auto *NS = dyn_cast<NamespaceDecl>(O);
  if (!NS || !NS->isInline())
    break;
  O = NS->getParent();
} while (O);

return false;
1833}

1835void DeclContext::makeDeclVisibleInContext(NamedDecl *D) {
DeclContext *PrimaryDC = this->getPrimaryContext();
DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext();
// If the decl is being added outside of its semantic decl context, we
// need to ensure that we eagerly build the lookup information for it.
PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC);
1841}

1843void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
                                                  bool Recoverable) {
assert(this == getPrimaryContext() && "expected a primary DC")(static_cast<void> (0));

if (!isLookupContext()) {
  if (isTransparentContext())
    getParent()->getPrimaryContext()
      ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
  return;
}

// Skip declarations which should be invisible to name lookup.
if (shouldBeHidden(D))
  return;

// If we already have a lookup data structure, perform the insertion into
// it. If we might have externally-stored decls with this name, look them
// up and perform the insertion. If this decl was declared outside its
// semantic context, buildLookup won't add it, so add it now.
//
// FIXME: As a performance hack, don't add such decls into the translation
// unit unless we're in C++, since qualified lookup into the TU is never
// performed.
if (LookupPtr || hasExternalVisibleStorage() ||
    ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) &&
     (getParentASTContext().getLangOpts().CPlusPlus ||
      !isTranslationUnit()))) {
  // If we have lazily omitted any decls, they might have the same name as
  // the decl which we are adding, so build a full lookup table before adding
  // this decl.
  buildLookup();
  makeDeclVisibleInContextImpl(D, Internal);
} else {
  setHasLazyLocalLexicalLookups(true);
}

// If we are a transparent context or inline namespace, insert into our
// parent context, too. This operation is recursive.
if (isTransparentContext() || isInlineNamespace())
  getParent()->getPrimaryContext()->
      makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);

auto *DCAsDecl = cast<Decl>(this);
// Notify that a decl was made visible unless we are a Tag being defined.
if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined()))
  if (ASTMutationListener *L = DCAsDecl->getASTMutationListener())
    L->AddedVisibleDecl(this, D);
1890}

1892void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
// Find or create the stored declaration map.
StoredDeclsMap *Map = LookupPtr;
if (!Map) {
  ASTContext *C = &getParentASTContext();
  Map = CreateStoredDeclsMap(*C);
}

// If there is an external AST source, load any declarations it knows about
// with this declaration's name.
// If the lookup table contains an entry about this name it means that we
// have already checked the external source.
if (!Internal)
  if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
    if (hasExternalVisibleStorage() &&
        Map->find(D->getDeclName()) == Map->end())
      Source->FindExternalVisibleDeclsByName(this, D->getDeclName());

// Insert this declaration into the map.
StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()];

if (Internal) {
  // If this is being added as part of loading an external declaration,
  // this may not be the only external declaration with this name.
  // In this case, we never try to replace an existing declaration; we'll
  // handle that when we finalize the list of declarations for this name.
  DeclNameEntries.setHasExternalDecls();
  DeclNameEntries.prependDeclNoReplace(D);
  return;
}

DeclNameEntries.addOrReplaceDecl(D);
1924}

1926UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const {
return cast<UsingDirectiveDecl>(*I);
1928}

1930/// Returns iterator range [First, Last) of UsingDirectiveDecls stored within
1931/// this context.
1932DeclContext::udir_range DeclContext::using_directives() const {
// FIXME: Use something more efficient than normal lookup for using
// directives. In C++, using directives are looked up more than anything else.
lookup_result Result = lookup(UsingDirectiveDecl::getName());
return udir_range(Result.begin(), Result.end());
1937}

1939//===----------------------------------------------------------------------===//
1940// Creation and Destruction of StoredDeclsMaps.                               //
1941//===----------------------------------------------------------------------===//

1943StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const {
assert(!LookupPtr && "context already has a decls map")(static_cast<void> (0));
assert(getPrimaryContext() == this &&(static_cast<void> (0))
       "creating decls map on non-primary context")(static_cast<void> (0));

StoredDeclsMap *M;
bool Dependent = isDependentContext();
if (Dependent)
  M = new DependentStoredDeclsMap();
else
  M = new StoredDeclsMap();
M->Previous = C.LastSDM;
C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent);
LookupPtr = M;
return M;
1958}

1960void ASTContext::ReleaseDeclContextMaps() {
// It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap
// pointer because the subclass doesn't add anything that needs to
// be deleted.
StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt());
1965}

1967void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) {
while (Map) {
  // Advance the iteration before we invalidate memory.
  llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous;

  if (Dependent)
    delete static_cast<DependentStoredDeclsMap*>(Map);
  else
    delete Map;

  Map = Next.getPointer();
  Dependent = Next.getInt();
}
1980}

1982DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C,
                                               DeclContext *Parent,
                                         const PartialDiagnostic &PDiag) {
assert(Parent->isDependentContext()(static_cast<void> (0))
       && "cannot iterate dependent diagnostics of non-dependent context")(static_cast<void> (0));
Parent = Parent->getPrimaryContext();
if (!Parent->LookupPtr)
  Parent->CreateStoredDeclsMap(C);

auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr);

// Allocate the copy of the PartialDiagnostic via the ASTContext's
// BumpPtrAllocator, rather than the ASTContext itself.
DiagnosticStorage *DiagStorage = nullptr;
if (PDiag.hasStorage())
  DiagStorage = new (C) DiagnosticStorage;

auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage);

// TODO: Maybe we shouldn't reverse the order during insertion.
DD->NextDiagnostic = Map->FirstDiagnostic;
Map->FirstDiagnostic = DD;

return DD;
2006}