/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/Parse/ParseDeclCXX.cpp

Bug Summary

File:	clang/lib/Parse/ParseDeclCXX.cpp
Warning:	line 633, column 9 Forming reference to null pointer

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 ParseDeclCXX.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/Parse -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/Parse -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/Parse -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/Parse -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/Parse/ParseDeclCXX.cpp

/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/Parse/ParseDeclCXX.cpp

→

1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===//
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 C++ Declaration portions of the Parser interfaces.
10//
11//===----------------------------------------------------------------------===//

13#include "clang/Parse/Parser.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/DeclTemplate.h"
16#include "clang/AST/PrettyDeclStackTrace.h"
17#include "clang/Basic/Attributes.h"
18#include "clang/Basic/CharInfo.h"
19#include "clang/Basic/OperatorKinds.h"
20#include "clang/Basic/TargetInfo.h"
21#include "clang/Parse/ParseDiagnostic.h"
22#include "clang/Parse/RAIIObjectsForParser.h"
23#include "clang/Sema/DeclSpec.h"
24#include "clang/Sema/ParsedTemplate.h"
25#include "clang/Sema/Scope.h"
26#include "llvm/ADT/SmallString.h"
27#include "llvm/Support/TimeProfiler.h"

29using namespace clang;

31/// ParseNamespace - We know that the current token is a namespace keyword. This
32/// may either be a top level namespace or a block-level namespace alias. If
33/// there was an inline keyword, it has already been parsed.
34///
35///       namespace-definition: [C++: namespace.def]
36///         named-namespace-definition
37///         unnamed-namespace-definition
38///         nested-namespace-definition
39///
40///       named-namespace-definition:
41///         'inline'[opt] 'namespace' attributes[opt] identifier '{'
42///         namespace-body '}'
43///
44///       unnamed-namespace-definition:
45///         'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
46///
47///       nested-namespace-definition:
48///         'namespace' enclosing-namespace-specifier '::' 'inline'[opt]
49///         identifier '{' namespace-body '}'
50///
51///       enclosing-namespace-specifier:
52///         identifier
53///         enclosing-namespace-specifier '::' 'inline'[opt] identifier
54///
55///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
56///         'namespace' identifier '=' qualified-namespace-specifier ';'
57///
58Parser::DeclGroupPtrTy Parser::ParseNamespace(DeclaratorContext Context,
                                            SourceLocation &DeclEnd,
                                            SourceLocation InlineLoc) {
assert(Tok.is(tok::kw_namespace) && "Not a namespace!")(static_cast<void> (0));
SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
ObjCDeclContextSwitch ObjCDC(*this);

if (Tok.is(tok::code_completion)) {
  cutOffParsing();
  Actions.CodeCompleteNamespaceDecl(getCurScope());
  return nullptr;
}

SourceLocation IdentLoc;
IdentifierInfo *Ident = nullptr;
InnerNamespaceInfoList ExtraNSs;
SourceLocation FirstNestedInlineLoc;

ParsedAttributesWithRange attrs(AttrFactory);
SourceLocation attrLoc;
if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) {
  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
                              ? diag::warn_cxx14_compat_ns_enum_attribute
                              : diag::ext_ns_enum_attribute)
    << 0 /*namespace*/;
  attrLoc = Tok.getLocation();
  ParseCXX11Attributes(attrs);
}

if (Tok.is(tok::identifier)) {
  Ident = Tok.getIdentifierInfo();
  IdentLoc = ConsumeToken();  // eat the identifier.
  while (Tok.is(tok::coloncolon) &&
         (NextToken().is(tok::identifier) ||
          (NextToken().is(tok::kw_inline) &&
           GetLookAheadToken(2).is(tok::identifier)))) {

    InnerNamespaceInfo Info;
    Info.NamespaceLoc = ConsumeToken();

    if (Tok.is(tok::kw_inline)) {
      Info.InlineLoc = ConsumeToken();
      if (FirstNestedInlineLoc.isInvalid())
        FirstNestedInlineLoc = Info.InlineLoc;
    }

    Info.Ident = Tok.getIdentifierInfo();
    Info.IdentLoc = ConsumeToken();

    ExtraNSs.push_back(Info);
  }
}

// A nested namespace definition cannot have attributes.
if (!ExtraNSs.empty() && attrLoc.isValid())
  Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute);

// Read label attributes, if present.
if (Tok.is(tok::kw___attribute)) {
  attrLoc = Tok.getLocation();
  ParseGNUAttributes(attrs);
}

if (Tok.is(tok::equal)) {
  if (!Ident) {
    Diag(Tok, diag::err_expected) << tok::identifier;
    // Skip to end of the definition and eat the ';'.
    SkipUntil(tok::semi);
    return nullptr;
  }
  if (attrLoc.isValid())
    Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias);
  if (InlineLoc.isValid())
    Diag(InlineLoc, diag::err_inline_namespace_alias)
        << FixItHint::CreateRemoval(InlineLoc);
  Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
  return Actions.ConvertDeclToDeclGroup(NSAlias);
}

BalancedDelimiterTracker T(*this, tok::l_brace);
if (T.consumeOpen()) {
  if (Ident)
    Diag(Tok, diag::err_expected) << tok::l_brace;
  else
    Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
  return nullptr;
}

if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
    getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
    getCurScope()->getFnParent()) {
  Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
  SkipUntil(tok::r_brace);
  return nullptr;
}

if (ExtraNSs.empty()) {
  // Normal namespace definition, not a nested-namespace-definition.
} else if (InlineLoc.isValid()) {
  Diag(InlineLoc, diag::err_inline_nested_namespace_definition);
} else if (getLangOpts().CPlusPlus20) {
  Diag(ExtraNSs[0].NamespaceLoc,
       diag::warn_cxx14_compat_nested_namespace_definition);
  if (FirstNestedInlineLoc.isValid())
    Diag(FirstNestedInlineLoc,
         diag::warn_cxx17_compat_inline_nested_namespace_definition);
} else if (getLangOpts().CPlusPlus17) {
  Diag(ExtraNSs[0].NamespaceLoc,
       diag::warn_cxx14_compat_nested_namespace_definition);
  if (FirstNestedInlineLoc.isValid())
    Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition);
} else {
  TentativeParsingAction TPA(*this);
  SkipUntil(tok::r_brace, StopBeforeMatch);
  Token rBraceToken = Tok;
  TPA.Revert();

  if (!rBraceToken.is(tok::r_brace)) {
    Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition)
        << SourceRange(ExtraNSs.front().NamespaceLoc,
                       ExtraNSs.back().IdentLoc);
  } else {
    std::string NamespaceFix;
    for (const auto &ExtraNS : ExtraNSs) {
      NamespaceFix += " { ";
      if (ExtraNS.InlineLoc.isValid())
        NamespaceFix += "inline ";
      NamespaceFix += "namespace ";
      NamespaceFix += ExtraNS.Ident->getName();
    }

    std::string RBraces;
    for (unsigned i = 0, e = ExtraNSs.size(); i != e; ++i)
      RBraces +=  "} ";

    Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition)
        << FixItHint::CreateReplacement(
               SourceRange(ExtraNSs.front().NamespaceLoc,
                           ExtraNSs.back().IdentLoc),
               NamespaceFix)
        << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
  }

  // Warn about nested inline namespaces.
  if (FirstNestedInlineLoc.isValid())
    Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition);
}

// If we're still good, complain about inline namespaces in non-C++0x now.
if (InlineLoc.isValid())
  Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
       diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);

// Enter a scope for the namespace.
ParseScope NamespaceScope(this, Scope::DeclScope);

UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(
    getCurScope(), InlineLoc, NamespaceLoc, IdentLoc, Ident,
    T.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl);

PrettyDeclStackTraceEntry CrashInfo(Actions.Context, NamespcDecl,
                                    NamespaceLoc, "parsing namespace");

// Parse the contents of the namespace.  This includes parsing recovery on
// any improperly nested namespaces.
ParseInnerNamespace(ExtraNSs, 0, InlineLoc, attrs, T);

// Leave the namespace scope.
NamespaceScope.Exit();

DeclEnd = T.getCloseLocation();
Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);

return Actions.ConvertDeclToDeclGroup(NamespcDecl,
                                      ImplicitUsingDirectiveDecl);
234}

236/// ParseInnerNamespace - Parse the contents of a namespace.
237void Parser::ParseInnerNamespace(const InnerNamespaceInfoList &InnerNSs,
                               unsigned int index, SourceLocation &InlineLoc,
                               ParsedAttributes &attrs,
                               BalancedDelimiterTracker &Tracker) {
if (index == InnerNSs.size()) {
  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
         Tok.isNot(tok::eof)) {
    ParsedAttributesWithRange attrs(AttrFactory);
    MaybeParseCXX11Attributes(attrs);
    ParseExternalDeclaration(attrs);
  }

  // The caller is what called check -- we are simply calling
  // the close for it.
  Tracker.consumeClose();

  return;
}

// Handle a nested namespace definition.
// FIXME: Preserve the source information through to the AST rather than
// desugaring it here.
ParseScope NamespaceScope(this, Scope::DeclScope);
UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(
    getCurScope(), InnerNSs[index].InlineLoc, InnerNSs[index].NamespaceLoc,
    InnerNSs[index].IdentLoc, InnerNSs[index].Ident,
    Tracker.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl);
assert(!ImplicitUsingDirectiveDecl &&(static_cast<void> (0))
       "nested namespace definition cannot define anonymous namespace")(static_cast<void> (0));

ParseInnerNamespace(InnerNSs, ++index, InlineLoc, attrs, Tracker);

NamespaceScope.Exit();
Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
272}

274/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
275/// alias definition.
276///
277Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
                                SourceLocation AliasLoc,
                                IdentifierInfo *Alias,
                                SourceLocation &DeclEnd) {
assert(Tok.is(tok::equal) && "Not equal token")(static_cast<void> (0));

ConsumeToken(); // eat the '='.

if (Tok.is(tok::code_completion)) {
  cutOffParsing();
  Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
  return nullptr;
}

CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
                               /*ObjectHadErrors=*/false,
                               /*EnteringContext=*/false,
                               /*MayBePseudoDestructor=*/nullptr,
                               /*IsTypename=*/false,
                               /*LastII=*/nullptr,
                               /*OnlyNamespace=*/true);

if (Tok.isNot(tok::identifier)) {
  Diag(Tok, diag::err_expected_namespace_name);
  // Skip to end of the definition and eat the ';'.
  SkipUntil(tok::semi);
  return nullptr;
}

if (SS.isInvalid()) {
  // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
  // Skip to end of the definition and eat the ';'.
  SkipUntil(tok::semi);
  return nullptr;
}

// Parse identifier.
IdentifierInfo *Ident = Tok.getIdentifierInfo();
SourceLocation IdentLoc = ConsumeToken();

// Eat the ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name))
  SkipUntil(tok::semi);

return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc,
                                      Alias, SS, IdentLoc, Ident);
326}

328/// ParseLinkage - We know that the current token is a string_literal
329/// and just before that, that extern was seen.
330///
331///       linkage-specification: [C++ 7.5p2: dcl.link]
332///         'extern' string-literal '{' declaration-seq[opt] '}'
333///         'extern' string-literal declaration
334///
335Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, DeclaratorContext Context) {
assert(isTokenStringLiteral() && "Not a string literal!")(static_cast<void> (0));
ExprResult Lang = ParseStringLiteralExpression(false);

ParseScope LinkageScope(this, Scope::DeclScope);
Decl *LinkageSpec =
    Lang.isInvalid()
        ? nullptr
        : Actions.ActOnStartLinkageSpecification(
              getCurScope(), DS.getSourceRange().getBegin(), Lang.get(),
              Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());

ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);

if (Tok.isNot(tok::l_brace)) {
  // Reset the source range in DS, as the leading "extern"
  // does not really belong to the inner declaration ...
  DS.SetRangeStart(SourceLocation());
  DS.SetRangeEnd(SourceLocation());
  // ... but anyway remember that such an "extern" was seen.
  DS.setExternInLinkageSpec(true);
  ParseExternalDeclaration(attrs, &DS);
  return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
                           getCurScope(), LinkageSpec, SourceLocation())
                     : nullptr;
}

DS.abort();

ProhibitAttributes(attrs);

BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();

unsigned NestedModules = 0;
while (true) {
  switch (Tok.getKind()) {
  case tok::annot_module_begin:
    ++NestedModules;
    ParseTopLevelDecl();
    continue;

  case tok::annot_module_end:
    if (!NestedModules)
      break;
    --NestedModules;
    ParseTopLevelDecl();
    continue;

  case tok::annot_module_include:
    ParseTopLevelDecl();
    continue;

  case tok::eof:
    break;

  case tok::r_brace:
    if (!NestedModules)
      break;
    LLVM_FALLTHROUGH[[gnu::fallthrough]];
  default:
    ParsedAttributesWithRange attrs(AttrFactory);
    MaybeParseCXX11Attributes(attrs);
    ParseExternalDeclaration(attrs);
    continue;
  }

  break;
}

T.consumeClose();
return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
                         getCurScope(), LinkageSpec, T.getCloseLocation())
                   : nullptr;
410}

412/// Parse a C++ Modules TS export-declaration.
413///
414///       export-declaration:
415///         'export' declaration
416///         'export' '{' declaration-seq[opt] '}'
417///
418Decl *Parser::ParseExportDeclaration() {
assert(Tok.is(tok::kw_export))(static_cast<void> (0));
SourceLocation ExportLoc = ConsumeToken();

ParseScope ExportScope(this, Scope::DeclScope);
Decl *ExportDecl = Actions.ActOnStartExportDecl(
    getCurScope(), ExportLoc,
    Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());

if (Tok.isNot(tok::l_brace)) {
  // FIXME: Factor out a ParseExternalDeclarationWithAttrs.
  ParsedAttributesWithRange Attrs(AttrFactory);
  MaybeParseCXX11Attributes(Attrs);
  MaybeParseMicrosoftAttributes(Attrs);
  ParseExternalDeclaration(Attrs);
  return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
                                       SourceLocation());
}

BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();

// The Modules TS draft says "An export-declaration shall declare at least one
// entity", but the intent is that it shall contain at least one declaration.
if (Tok.is(tok::r_brace) && getLangOpts().ModulesTS) {
  Diag(ExportLoc, diag::err_export_empty)
      << SourceRange(ExportLoc, Tok.getLocation());
}

while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
       Tok.isNot(tok::eof)) {
  ParsedAttributesWithRange Attrs(AttrFactory);
  MaybeParseCXX11Attributes(Attrs);
  MaybeParseMicrosoftAttributes(Attrs);
  ParseExternalDeclaration(Attrs);
}

T.consumeClose();
return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
                                     T.getCloseLocation());
458}

460/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
461/// using-directive. Assumes that current token is 'using'.
462Parser::DeclGroupPtrTy
463Parser::ParseUsingDirectiveOrDeclaration(DeclaratorContext Context,
                                       const ParsedTemplateInfo &TemplateInfo,
                                       SourceLocation &DeclEnd,
                                       ParsedAttributesWithRange &attrs) {
assert(Tok.is(tok::kw_using) && "Not using token")(static_cast<void> (0));
ObjCDeclContextSwitch ObjCDC(*this);

// Eat 'using'.
SourceLocation UsingLoc = ConsumeToken();

if (Tok.is(tok::code_completion)) {
1
Taking false branch→
  cutOffParsing();
  Actions.CodeCompleteUsing(getCurScope());
  return nullptr;
}

// Consume unexpected 'template' keywords.
while (Tok.is(tok::kw_template)) {
2
←
Loop condition is false. Execution continues on line 487→
  SourceLocation TemplateLoc = ConsumeToken();
  Diag(TemplateLoc, diag::err_unexpected_template_after_using)
      << FixItHint::CreateRemoval(TemplateLoc);
}

// 'using namespace' means this is a using-directive.
if (Tok.is(tok::kw_namespace)) {
3
←
Taking false branch→
  // Template parameters are always an error here.
  if (TemplateInfo.Kind) {
    SourceRange R = TemplateInfo.getSourceRange();
    Diag(UsingLoc, diag::err_templated_using_directive_declaration)
      << 0 /* directive */ << R << FixItHint::CreateRemoval(R);
  }

  Decl *UsingDir = ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
  return Actions.ConvertDeclToDeclGroup(UsingDir);
}

// Otherwise, it must be a using-declaration or an alias-declaration.
return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, attrs,
4
←
Calling 'Parser::ParseUsingDeclaration'→
                             AS_none);
502}

504/// ParseUsingDirective - Parse C++ using-directive, assumes
505/// that current token is 'namespace' and 'using' was already parsed.
506///
507///       using-directive: [C++ 7.3.p4: namespace.udir]
508///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
509///                 namespace-name ;
510/// [GNU] using-directive:
511///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
512///                 namespace-name attributes[opt] ;
513///
514Decl *Parser::ParseUsingDirective(DeclaratorContext Context,
                                SourceLocation UsingLoc,
                                SourceLocation &DeclEnd,
                                ParsedAttributes &attrs) {
assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token")(static_cast<void> (0));

// Eat 'namespace'.
SourceLocation NamespcLoc = ConsumeToken();

if (Tok.is(tok::code_completion)) {
  cutOffParsing();
  Actions.CodeCompleteUsingDirective(getCurScope());
  return nullptr;
}

CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
                               /*ObjectHadErrors=*/false,
                               /*EnteringContext=*/false,
                               /*MayBePseudoDestructor=*/nullptr,
                               /*IsTypename=*/false,
                               /*LastII=*/nullptr,
                               /*OnlyNamespace=*/true);

IdentifierInfo *NamespcName = nullptr;
SourceLocation IdentLoc = SourceLocation();

// Parse namespace-name.
if (Tok.isNot(tok::identifier)) {
  Diag(Tok, diag::err_expected_namespace_name);
  // If there was invalid namespace name, skip to end of decl, and eat ';'.
  SkipUntil(tok::semi);
  // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
  return nullptr;
}

if (SS.isInvalid()) {
  // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
  // Skip to end of the definition and eat the ';'.
  SkipUntil(tok::semi);
  return nullptr;
}

// Parse identifier.
NamespcName = Tok.getIdentifierInfo();
IdentLoc = ConsumeToken();

// Parse (optional) attributes (most likely GNU strong-using extension).
bool GNUAttr = false;
if (Tok.is(tok::kw___attribute)) {
  GNUAttr = true;
  ParseGNUAttributes(attrs);
}

// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi,
                     GNUAttr ? diag::err_expected_semi_after_attribute_list
                             : diag::err_expected_semi_after_namespace_name))
  SkipUntil(tok::semi);

return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
                                   IdentLoc, NamespcName, attrs);
578}

580/// Parse a using-declarator (or the identifier in a C++11 alias-declaration).
581///
582///     using-declarator:
583///       'typename'[opt] nested-name-specifier unqualified-id
584///
585bool Parser::ParseUsingDeclarator(DeclaratorContext Context,
                                UsingDeclarator &D) {
D.clear();

// Ignore optional 'typename'.
// FIXME: This is wrong; we should parse this as a typename-specifier.
TryConsumeToken(tok::kw_typename, D.TypenameLoc);

if (Tok.is(tok::kw___super)) {
7
←
Calling 'Token::is'→
10
←
Returning from 'Token::is'→
11
←
Taking false branch→
  Diag(Tok.getLocation(), diag::err_super_in_using_declaration);
  return true;
}

// Parse nested-name-specifier.
IdentifierInfo *LastII = nullptr;
if (ParseOptionalCXXScopeSpecifier(D.SS, /*ObjectType=*/nullptr,
12
←
Value assigned to 'LastII'→
13
←
Assuming the condition is false→
14
←
Taking false branch→
                                   /*ObjectHadErrors=*/false,
                                   /*EnteringContext=*/false,
                                   /*MayBePseudoDtor=*/nullptr,
                                   /*IsTypename=*/false,
                                   /*LastII=*/&LastII,
                                   /*OnlyNamespace=*/false,
                                   /*InUsingDeclaration=*/true))

  return true;
if (D.SS.isInvalid())
15
←
Calling 'CXXScopeSpec::isInvalid'→
17
←
Returning from 'CXXScopeSpec::isInvalid'→
  return true;

// Parse the unqualified-id. We allow parsing of both constructor and
// destructor names and allow the action module to diagnose any semantic
// errors.
//
// C++11 [class.qual]p2:
//   [...] in a using-declaration that is a member-declaration, if the name
//   specified after the nested-name-specifier is the same as the identifier
//   or the simple-template-id's template-name in the last component of the
//   nested-name-specifier, the name is [...] considered to name the
//   constructor.
if (getLangOpts().CPlusPlus11 && Context == DeclaratorContext::Member &&
18
←
Assuming field 'CPlusPlus11' is not equal to 0→
19
←
Assuming 'Context' is equal to Member→
38
←
Taking true branch→
    Tok.is(tok::identifier) &&
20
←
Calling 'Token::is'→
23
←
Returning from 'Token::is'→
    (NextToken().is(tok::semi) || NextToken().is(tok::comma) ||
24
←
Calling 'Token::is'→
27
←
Returning from 'Token::is'→
     NextToken().is(tok::ellipsis) || NextToken().is(tok::l_square) ||
     NextToken().is(tok::kw___attribute)) &&
    D.SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
28
←
Calling 'CXXScopeSpec::isNotEmpty'→
34
←
Returning from 'CXXScopeSpec::isNotEmpty'→
35
←
Assuming pointer value is null→
    !D.SS.getScopeRep()->getAsNamespace() &&
36
←
Assuming the condition is true→
    !D.SS.getScopeRep()->getAsNamespaceAlias()) {
37
←
Assuming the condition is true→
  SourceLocation IdLoc = ConsumeToken();
  ParsedType Type =
      Actions.getInheritingConstructorName(D.SS, IdLoc, *LastII);
39
←
Forming reference to null pointer
  D.Name.setConstructorName(Type, IdLoc, IdLoc);
} else {
  if (ParseUnqualifiedId(
          D.SS, /*ObjectType=*/nullptr,
          /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
          /*AllowDestructorName=*/true,
          /*AllowConstructorName=*/
          !(Tok.is(tok::identifier) && NextToken().is(tok::equal)),
          /*AllowDeductionGuide=*/false, nullptr, D.Name))
    return true;
}

if (TryConsumeToken(tok::ellipsis, D.EllipsisLoc))
  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
       diag::warn_cxx17_compat_using_declaration_pack :
       diag::ext_using_declaration_pack);

return false;
652}

654/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
655/// Assumes that 'using' was already seen.
656///
657///     using-declaration: [C++ 7.3.p3: namespace.udecl]
658///       'using' using-declarator-list[opt] ;
659///
660///     using-declarator-list: [C++1z]
661///       using-declarator '...'[opt]
662///       using-declarator-list ',' using-declarator '...'[opt]
663///
664///     using-declarator-list: [C++98-14]
665///       using-declarator
666///
667///     alias-declaration: C++11 [dcl.dcl]p1
668///       'using' identifier attribute-specifier-seq[opt] = type-id ;
669///
670///     using-enum-declaration: [C++20, dcl.enum]
671///       'using' elaborated-enum-specifier ;
672///
673///     elaborated-enum-specifier:
674///       'enum' nested-name-specifier[opt] identifier
675Parser::DeclGroupPtrTy
676Parser::ParseUsingDeclaration(
  DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
  SourceLocation UsingLoc, SourceLocation &DeclEnd,
  ParsedAttributesWithRange &PrefixAttrs, AccessSpecifier AS) {
SourceLocation UELoc;
if (TryConsumeToken(tok::kw_enum, UELoc)) {
5
←
Taking false branch→
  // C++20 using-enum
  Diag(UELoc, getLangOpts().CPlusPlus20
                  ? diag::warn_cxx17_compat_using_enum_declaration
                  : diag::ext_using_enum_declaration);

  DiagnoseCXX11AttributeExtension(PrefixAttrs);

  DeclSpec DS(AttrFactory);
  ParseEnumSpecifier(UELoc, DS, TemplateInfo, AS,
                     // DSC_trailing has the semantics we desire
                     DeclSpecContext::DSC_trailing);

  if (TemplateInfo.Kind) {
    SourceRange R = TemplateInfo.getSourceRange();
    Diag(UsingLoc, diag::err_templated_using_directive_declaration)
        << 1 /* declaration */ << R << FixItHint::CreateRemoval(R);

    return nullptr;
  }

  Decl *UED = Actions.ActOnUsingEnumDeclaration(getCurScope(), AS, UsingLoc,
                                                UELoc, DS);
  DeclEnd = Tok.getLocation();
  if (ExpectAndConsume(tok::semi, diag::err_expected_after,
                       "using-enum declaration"))
    SkipUntil(tok::semi);

  return Actions.ConvertDeclToDeclGroup(UED);
}

// Check for misplaced attributes before the identifier in an
// alias-declaration.
ParsedAttributesWithRange MisplacedAttrs(AttrFactory);
MaybeParseCXX11Attributes(MisplacedAttrs);

UsingDeclarator D;
bool InvalidDeclarator = ParseUsingDeclarator(Context, D);
6
←
Calling 'Parser::ParseUsingDeclarator'→

ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseAttributes(PAKM_GNU | PAKM_CXX11, Attrs);

// If we had any misplaced attributes from earlier, this is where they
// should have been written.
if (MisplacedAttrs.Range.isValid()) {
  Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed)
      << FixItHint::CreateInsertionFromRange(
             Tok.getLocation(),
             CharSourceRange::getTokenRange(MisplacedAttrs.Range))
      << FixItHint::CreateRemoval(MisplacedAttrs.Range);
  Attrs.takeAllFrom(MisplacedAttrs);
}

// Maybe this is an alias-declaration.
if (Tok.is(tok::equal)) {
  if (InvalidDeclarator) {
    SkipUntil(tok::semi);
    return nullptr;
  }

  ProhibitAttributes(PrefixAttrs);

  Decl *DeclFromDeclSpec = nullptr;
  Decl *AD = ParseAliasDeclarationAfterDeclarator(
      TemplateInfo, UsingLoc, D, DeclEnd, AS, Attrs, &DeclFromDeclSpec);
  return Actions.ConvertDeclToDeclGroup(AD, DeclFromDeclSpec);
}

DiagnoseCXX11AttributeExtension(PrefixAttrs);

// Diagnose an attempt to declare a templated using-declaration.
// In C++11, alias-declarations can be templates:
//   template <...> using id = type;
if (TemplateInfo.Kind) {
  SourceRange R = TemplateInfo.getSourceRange();
  Diag(UsingLoc, diag::err_templated_using_directive_declaration)
    << 1 /* declaration */ << R << FixItHint::CreateRemoval(R);

  // Unfortunately, we have to bail out instead of recovering by
  // ignoring the parameters, just in case the nested name specifier
  // depends on the parameters.
  return nullptr;
}

SmallVector<Decl *, 8> DeclsInGroup;
while (true) {
  // Parse (optional) attributes.
  MaybeParseAttributes(PAKM_GNU | PAKM_CXX11, Attrs);
  DiagnoseCXX11AttributeExtension(Attrs);
  Attrs.addAll(PrefixAttrs.begin(), PrefixAttrs.end());

  if (InvalidDeclarator)
    SkipUntil(tok::comma, tok::semi, StopBeforeMatch);
  else {
    // "typename" keyword is allowed for identifiers only,
    // because it may be a type definition.
    if (D.TypenameLoc.isValid() &&
        D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
      Diag(D.Name.getSourceRange().getBegin(),
           diag::err_typename_identifiers_only)
          << FixItHint::CreateRemoval(SourceRange(D.TypenameLoc));
      // Proceed parsing, but discard the typename keyword.
      D.TypenameLoc = SourceLocation();
    }

    Decl *UD = Actions.ActOnUsingDeclaration(getCurScope(), AS, UsingLoc,
                                             D.TypenameLoc, D.SS, D.Name,
                                             D.EllipsisLoc, Attrs);
    if (UD)
      DeclsInGroup.push_back(UD);
  }

  if (!TryConsumeToken(tok::comma))
    break;

  // Parse another using-declarator.
  Attrs.clear();
  InvalidDeclarator = ParseUsingDeclarator(Context, D);
}

if (DeclsInGroup.size() > 1)
  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
       diag::warn_cxx17_compat_multi_using_declaration :
       diag::ext_multi_using_declaration);

// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_after,
                     !Attrs.empty()    ? "attributes list"
                     : UELoc.isValid() ? "using-enum declaration"
                                       : "using declaration"))
  SkipUntil(tok::semi);

return Actions.BuildDeclaratorGroup(DeclsInGroup);
815}

817Decl *Parser::ParseAliasDeclarationAfterDeclarator(
  const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc,
  UsingDeclarator &D, SourceLocation &DeclEnd, AccessSpecifier AS,
  ParsedAttributes &Attrs, Decl **OwnedType) {
if (ExpectAndConsume(tok::equal)) {
  SkipUntil(tok::semi);
  return nullptr;
}

Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
     diag::warn_cxx98_compat_alias_declaration :
     diag::ext_alias_declaration);

// Type alias templates cannot be specialized.
int SpecKind = -1;
if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
    D.Name.getKind() == UnqualifiedIdKind::IK_TemplateId)
  SpecKind = 0;
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
  SpecKind = 1;
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
  SpecKind = 2;
if (SpecKind != -1) {
  SourceRange Range;
  if (SpecKind == 0)
    Range = SourceRange(D.Name.TemplateId->LAngleLoc,
                        D.Name.TemplateId->RAngleLoc);
  else
    Range = TemplateInfo.getSourceRange();
  Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
    << SpecKind << Range;
  SkipUntil(tok::semi);
  return nullptr;
}

// Name must be an identifier.
if (D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
  Diag(D.Name.StartLocation, diag::err_alias_declaration_not_identifier);
  // No removal fixit: can't recover from this.
  SkipUntil(tok::semi);
  return nullptr;
} else if (D.TypenameLoc.isValid())
  Diag(D.TypenameLoc, diag::err_alias_declaration_not_identifier)
      << FixItHint::CreateRemoval(SourceRange(
             D.TypenameLoc,
             D.SS.isNotEmpty() ? D.SS.getEndLoc() : D.TypenameLoc));
else if (D.SS.isNotEmpty())
  Diag(D.SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
    << FixItHint::CreateRemoval(D.SS.getRange());
if (D.EllipsisLoc.isValid())
  Diag(D.EllipsisLoc, diag::err_alias_declaration_pack_expansion)
    << FixItHint::CreateRemoval(SourceRange(D.EllipsisLoc));

Decl *DeclFromDeclSpec = nullptr;
TypeResult TypeAlias =
    ParseTypeName(nullptr,
                  TemplateInfo.Kind ? DeclaratorContext::AliasTemplate
                                    : DeclaratorContext::AliasDecl,
                  AS, &DeclFromDeclSpec, &Attrs);
if (OwnedType)
  *OwnedType = DeclFromDeclSpec;

// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_after,
                     !Attrs.empty() ? "attributes list"
                                    : "alias declaration"))
  SkipUntil(tok::semi);

TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
MultiTemplateParamsArg TemplateParamsArg(
  TemplateParams ? TemplateParams->data() : nullptr,
  TemplateParams ? TemplateParams->size() : 0);
return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
                                     UsingLoc, D.Name, Attrs, TypeAlias,
                                     DeclFromDeclSpec);
893}

895static FixItHint getStaticAssertNoMessageFixIt(const Expr *AssertExpr,
                                             SourceLocation EndExprLoc) {
if (const auto *BO = dyn_cast_or_null<BinaryOperator>(AssertExpr)) {
  if (BO->getOpcode() == BO_LAnd &&
      isa<StringLiteral>(BO->getRHS()->IgnoreImpCasts()))
    return FixItHint::CreateReplacement(BO->getOperatorLoc(), ",");
}
return FixItHint::CreateInsertion(EndExprLoc, ", \"\"");
903}

905/// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
906///
907/// [C++0x] static_assert-declaration:
908///           static_assert ( constant-expression  ,  string-literal  ) ;
909///
910/// [C11]   static_assert-declaration:
911///           _Static_assert ( constant-expression  ,  string-literal  ) ;
912///
913Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
assert(Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) &&(static_cast<void> (0))
       "Not a static_assert declaration")(static_cast<void> (0));

if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
  Diag(Tok, diag::ext_c11_feature) << Tok.getName();
if (Tok.is(tok::kw_static_assert)) {
  if (!getLangOpts().CPlusPlus)
    Diag(Tok, diag::ext_ms_static_assert)
        << FixItHint::CreateReplacement(Tok.getLocation(), "_Static_assert");
  else
    Diag(Tok, diag::warn_cxx98_compat_static_assert);
}

SourceLocation StaticAssertLoc = ConsumeToken();

BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
  Diag(Tok, diag::err_expected) << tok::l_paren;
  SkipMalformedDecl();
  return nullptr;
}

EnterExpressionEvaluationContext ConstantEvaluated(
    Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
ExprResult AssertExpr(ParseConstantExpressionInExprEvalContext());
if (AssertExpr.isInvalid()) {
  SkipMalformedDecl();
  return nullptr;
}

ExprResult AssertMessage;
if (Tok.is(tok::r_paren)) {
  unsigned DiagVal;
  if (getLangOpts().CPlusPlus17)
    DiagVal = diag::warn_cxx14_compat_static_assert_no_message;
  else if (getLangOpts().CPlusPlus)
    DiagVal = diag::ext_cxx_static_assert_no_message;
  else if (getLangOpts().C2x)
    DiagVal = diag::warn_c17_compat_static_assert_no_message;
  else
    DiagVal = diag::ext_c_static_assert_no_message;
  Diag(Tok, DiagVal) << getStaticAssertNoMessageFixIt(AssertExpr.get(),
                                                      Tok.getLocation());
} else {
  if (ExpectAndConsume(tok::comma)) {
    SkipUntil(tok::semi);
    return nullptr;
  }

  if (!isTokenStringLiteral()) {
    Diag(Tok, diag::err_expected_string_literal)
      << /*Source='static_assert'*/1;
    SkipMalformedDecl();
    return nullptr;
  }

  AssertMessage = ParseStringLiteralExpression();
  if (AssertMessage.isInvalid()) {
    SkipMalformedDecl();
    return nullptr;
  }
}

T.consumeClose();

DeclEnd = Tok.getLocation();
ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);

return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
                                            AssertExpr.get(),
                                            AssertMessage.get(),
                                            T.getCloseLocation());
986}

988/// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
989///
990/// 'decltype' ( expression )
991/// 'decltype' ( 'auto' )      [C++1y]
992///
993SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
assert(Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)(static_cast<void> (0))
         && "Not a decltype specifier")(static_cast<void> (0));

ExprResult Result;
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc;

if (Tok.is(tok::annot_decltype)) {
  Result = getExprAnnotation(Tok);
  EndLoc = Tok.getAnnotationEndLoc();
  ConsumeAnnotationToken();
  if (Result.isInvalid()) {
    DS.SetTypeSpecError();
    return EndLoc;
  }
} else {
  if (Tok.getIdentifierInfo()->isStr("decltype"))
    Diag(Tok, diag::warn_cxx98_compat_decltype);

  ConsumeToken();

  BalancedDelimiterTracker T(*this, tok::l_paren);
  if (T.expectAndConsume(diag::err_expected_lparen_after,
                         "decltype", tok::r_paren)) {
    DS.SetTypeSpecError();
    return T.getOpenLocation() == Tok.getLocation() ?
           StartLoc : T.getOpenLocation();
  }

  // Check for C++1y 'decltype(auto)'.
  if (Tok.is(tok::kw_auto)) {
    // No need to disambiguate here: an expression can't start with 'auto',
    // because the typename-specifier in a function-style cast operation can't
    // be 'auto'.
    Diag(Tok.getLocation(),
         getLangOpts().CPlusPlus14
           ? diag::warn_cxx11_compat_decltype_auto_type_specifier
           : diag::ext_decltype_auto_type_specifier);
    ConsumeToken();
  } else {
    // Parse the expression

    // C++11 [dcl.type.simple]p4:
    //   The operand of the decltype specifier is an unevaluated operand.
    EnterExpressionEvaluationContext Unevaluated(
        Actions, Sema::ExpressionEvaluationContext::Unevaluated, nullptr,
        Sema::ExpressionEvaluationContextRecord::EK_Decltype);
    Result = Actions.CorrectDelayedTyposInExpr(
        ParseExpression(), /*InitDecl=*/nullptr,
        /*RecoverUncorrectedTypos=*/false,
        [](Expr *E) { return E->hasPlaceholderType() ? ExprError() : E; });
    if (Result.isInvalid()) {
      DS.SetTypeSpecError();
      if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
        EndLoc = ConsumeParen();
      } else {
        if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
          // Backtrack to get the location of the last token before the semi.
          PP.RevertCachedTokens(2);
          ConsumeToken(); // the semi.
          EndLoc = ConsumeAnyToken();
          assert(Tok.is(tok::semi))(static_cast<void> (0));
        } else {
          EndLoc = Tok.getLocation();
        }
      }
      return EndLoc;
    }

    Result = Actions.ActOnDecltypeExpression(Result.get());
  }

  // Match the ')'
  T.consumeClose();
  if (T.getCloseLocation().isInvalid()) {
    DS.SetTypeSpecError();
    // FIXME: this should return the location of the last token
    //        that was consumed (by "consumeClose()")
    return T.getCloseLocation();
  }

  if (Result.isInvalid()) {
    DS.SetTypeSpecError();
    return T.getCloseLocation();
  }

  EndLoc = T.getCloseLocation();
}
assert(!Result.isInvalid())(static_cast<void> (0));

const char *PrevSpec = nullptr;
unsigned DiagID;
const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
// Check for duplicate type specifiers (e.g. "int decltype(a)").
if (Result.get()
      ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
                           DiagID, Result.get(), Policy)
      : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
                           DiagID, Policy)) {
  Diag(StartLoc, DiagID) << PrevSpec;
  DS.SetTypeSpecError();
}
return EndLoc;
1097}

1099void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
                                             SourceLocation StartLoc,
                                             SourceLocation EndLoc) {
// make sure we have a token we can turn into an annotation token
if (PP.isBacktrackEnabled()) {
  PP.RevertCachedTokens(1);
  if (DS.getTypeSpecType() == TST_error) {
    // We encountered an error in parsing 'decltype(...)' so lets annotate all
    // the tokens in the backtracking cache - that we likely had to skip over
    // to get to a token that allows us to resume parsing, such as a
    // semi-colon.
    EndLoc = PP.getLastCachedTokenLocation();
  }
}
else
  PP.EnterToken(Tok, /*IsReinject*/true);

Tok.setKind(tok::annot_decltype);
setExprAnnotation(Tok,
                  DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() :
                  DS.getTypeSpecType() == TST_decltype_auto ? ExprResult() :
                  ExprError());
Tok.setAnnotationEndLoc(EndLoc);
Tok.setLocation(StartLoc);
PP.AnnotateCachedTokens(Tok);
1124}

1126void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
assert(Tok.is(tok::kw___underlying_type) &&(static_cast<void> (0))
       "Not an underlying type specifier")(static_cast<void> (0));

SourceLocation StartLoc = ConsumeToken();
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.expectAndConsume(diag::err_expected_lparen_after,
                     "__underlying_type", tok::r_paren)) {
  return;
}

TypeResult Result = ParseTypeName();
if (Result.isInvalid()) {
  SkipUntil(tok::r_paren, StopAtSemi);
  return;
}

// Match the ')'
T.consumeClose();
if (T.getCloseLocation().isInvalid())
  return;

const char *PrevSpec = nullptr;
unsigned DiagID;
if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
                       DiagID, Result.get(),
                       Actions.getASTContext().getPrintingPolicy()))
  Diag(StartLoc, DiagID) << PrevSpec;
DS.setTypeofParensRange(T.getRange());
1155}

1157/// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
1158/// class name or decltype-specifier. Note that we only check that the result
1159/// names a type; semantic analysis will need to verify that the type names a
1160/// class. The result is either a type or null, depending on whether a type
1161/// name was found.
1162///
1163///       base-type-specifier: [C++11 class.derived]
1164///         class-or-decltype
1165///       class-or-decltype: [C++11 class.derived]
1166///         nested-name-specifier[opt] class-name
1167///         decltype-specifier
1168///       class-name: [C++ class.name]
1169///         identifier
1170///         simple-template-id
1171///
1172/// In C++98, instead of base-type-specifier, we have:
1173///
1174///         ::[opt] nested-name-specifier[opt] class-name
1175TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
                                        SourceLocation &EndLocation) {
// Ignore attempts to use typename
if (Tok.is(tok::kw_typename)) {
  Diag(Tok, diag::err_expected_class_name_not_template)
    << FixItHint::CreateRemoval(Tok.getLocation());
  ConsumeToken();
}

// Parse optional nested-name-specifier
CXXScopeSpec SS;
if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
                                   /*ObjectHadErrors=*/false,
                                   /*EnteringContext=*/false))
  return true;

BaseLoc = Tok.getLocation();

// Parse decltype-specifier
// tok == kw_decltype is just error recovery, it can only happen when SS
// isn't empty
if (Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
  if (SS.isNotEmpty())
    Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
      << FixItHint::CreateRemoval(SS.getRange());
  // Fake up a Declarator to use with ActOnTypeName.
  DeclSpec DS(AttrFactory);

  EndLocation = ParseDecltypeSpecifier(DS);

  Declarator DeclaratorInfo(DS, DeclaratorContext::TypeName);
  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
}

// Check whether we have a template-id that names a type.
if (Tok.is(tok::annot_template_id)) {
  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
  if (TemplateId->mightBeType()) {
    AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true);

    assert(Tok.is(tok::annot_typename) && "template-id -> type failed")(static_cast<void> (0));
    TypeResult Type = getTypeAnnotation(Tok);
    EndLocation = Tok.getAnnotationEndLoc();
    ConsumeAnnotationToken();
    return Type;
  }

  // Fall through to produce an error below.
}

if (Tok.isNot(tok::identifier)) {
  Diag(Tok, diag::err_expected_class_name);
  return true;
}

IdentifierInfo *Id = Tok.getIdentifierInfo();
SourceLocation IdLoc = ConsumeToken();

if (Tok.is(tok::less)) {
  // It looks the user intended to write a template-id here, but the
  // template-name was wrong. Try to fix that.
  // FIXME: Invoke ParseOptionalCXXScopeSpecifier in a "'template' is neither
  // required nor permitted" mode, and do this there.
  TemplateNameKind TNK = TNK_Non_template;
  TemplateTy Template;
  if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
                                           &SS, Template, TNK)) {
    Diag(IdLoc, diag::err_unknown_template_name)
      << Id;
  }

  // Form the template name
  UnqualifiedId TemplateName;
  TemplateName.setIdentifier(Id, IdLoc);

  // Parse the full template-id, then turn it into a type.
  if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
                              TemplateName))
    return true;
  if (Tok.is(tok::annot_template_id) &&
      takeTemplateIdAnnotation(Tok)->mightBeType())
    AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true);

  // If we didn't end up with a typename token, there's nothing more we
  // can do.
  if (Tok.isNot(tok::annot_typename))
    return true;

  // Retrieve the type from the annotation token, consume that token, and
  // return.
  EndLocation = Tok.getAnnotationEndLoc();
  TypeResult Type = getTypeAnnotation(Tok);
  ConsumeAnnotationToken();
  return Type;
}

// We have an identifier; check whether it is actually a type.
IdentifierInfo *CorrectedII = nullptr;
ParsedType Type = Actions.getTypeName(
    *Id, IdLoc, getCurScope(), &SS, /*isClassName=*/true, false, nullptr,
    /*IsCtorOrDtorName=*/false,
    /*WantNontrivialTypeSourceInfo=*/true,
    /*IsClassTemplateDeductionContext*/ false, &CorrectedII);
if (!Type) {
  Diag(IdLoc, diag::err_expected_class_name);
  return true;
}

// Consume the identifier.
EndLocation = IdLoc;

// Fake up a Declarator to use with ActOnTypeName.
DeclSpec DS(AttrFactory);
DS.SetRangeStart(IdLoc);
DS.SetRangeEnd(EndLocation);
DS.getTypeSpecScope() = SS;

const char *PrevSpec = nullptr;
unsigned DiagID;
DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type,
                   Actions.getASTContext().getPrintingPolicy());

Declarator DeclaratorInfo(DS, DeclaratorContext::TypeName);
return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1299}

1301void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
while (Tok.isOneOf(tok::kw___single_inheritance,
                   tok::kw___multiple_inheritance,
                   tok::kw___virtual_inheritance)) {
  IdentifierInfo *AttrName = Tok.getIdentifierInfo();
  SourceLocation AttrNameLoc = ConsumeToken();
  attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
               ParsedAttr::AS_Keyword);
}
1310}

1312/// Determine whether the following tokens are valid after a type-specifier
1313/// which could be a standalone declaration. This will conservatively return
1314/// true if there's any doubt, and is appropriate for insert-';' fixits.
1315bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
// This switch enumerates the valid "follow" set for type-specifiers.
switch (Tok.getKind()) {
default: break;
case tok::semi:               // struct foo {...} ;
case tok::star:               // struct foo {...} *         P;
case tok::amp:                // struct foo {...} &         R = ...
case tok::ampamp:             // struct foo {...} &&        R = ...
case tok::identifier:         // struct foo {...} V         ;
case tok::r_paren:            //(struct foo {...} )         {4}
case tok::coloncolon:         // struct foo {...} ::        a::b;
case tok::annot_cxxscope:     // struct foo {...} a::       b;
case tok::annot_typename:     // struct foo {...} a         ::b;
case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
case tok::kw_decltype:        // struct foo {...} decltype  (a)::b;
case tok::l_paren:            // struct foo {...} (         x);
case tok::comma:              // __builtin_offsetof(struct foo{...} ,
case tok::kw_operator:        // struct foo       operator  ++() {...}
case tok::kw___declspec:      // struct foo {...} __declspec(...)
case tok::l_square:           // void f(struct f  [         3])
case tok::ellipsis:           // void f(struct f  ...       [Ns])
// FIXME: we should emit semantic diagnostic when declaration
// attribute is in type attribute position.
case tok::kw___attribute:     // struct foo __attribute__((used)) x;
case tok::annot_pragma_pack:  // struct foo {...} _Pragma(pack(pop));
// struct foo {...} _Pragma(section(...));
case tok::annot_pragma_ms_pragma:
// struct foo {...} _Pragma(vtordisp(pop));
case tok::annot_pragma_ms_vtordisp:
// struct foo {...} _Pragma(pointers_to_members(...));
case tok::annot_pragma_ms_pointers_to_members:
  return true;
case tok::colon:
  return CouldBeBitfield ||   // enum E { ... }   :         2;
         ColonIsSacred;       // _Generic(..., enum E :     2);
// Microsoft compatibility
case tok::kw___cdecl:         // struct foo {...} __cdecl      x;
case tok::kw___fastcall:      // struct foo {...} __fastcall   x;
case tok::kw___stdcall:       // struct foo {...} __stdcall    x;
case tok::kw___thiscall:      // struct foo {...} __thiscall   x;
case tok::kw___vectorcall:    // struct foo {...} __vectorcall x;
  // We will diagnose these calling-convention specifiers on non-function
  // declarations later, so claim they are valid after a type specifier.
  return getLangOpts().MicrosoftExt;
// Type qualifiers
case tok::kw_const:           // struct foo {...} const     x;
case tok::kw_volatile:        // struct foo {...} volatile  x;
case tok::kw_restrict:        // struct foo {...} restrict  x;
case tok::kw__Atomic:         // struct foo {...} _Atomic   x;
case tok::kw___unaligned:     // struct foo {...} __unaligned *x;
// Function specifiers
// Note, no 'explicit'. An explicit function must be either a conversion
// operator or a constructor. Either way, it can't have a return type.
case tok::kw_inline:          // struct foo       inline    f();
case tok::kw_virtual:         // struct foo       virtual   f();
case tok::kw_friend:          // struct foo       friend    f();
// Storage-class specifiers
case tok::kw_static:          // struct foo {...} static    x;
case tok::kw_extern:          // struct foo {...} extern    x;
case tok::kw_typedef:         // struct foo {...} typedef   x;
case tok::kw_register:        // struct foo {...} register  x;
case tok::kw_auto:            // struct foo {...} auto      x;
case tok::kw_mutable:         // struct foo {...} mutable   x;
case tok::kw_thread_local:    // struct foo {...} thread_local x;
case tok::kw_constexpr:       // struct foo {...} constexpr x;
case tok::kw_consteval:       // struct foo {...} consteval x;
case tok::kw_constinit:       // struct foo {...} constinit x;
  // As shown above, type qualifiers and storage class specifiers absolutely
  // can occur after class specifiers according to the grammar.  However,
  // almost no one actually writes code like this.  If we see one of these,
  // it is much more likely that someone missed a semi colon and the
  // type/storage class specifier we're seeing is part of the *next*
  // intended declaration, as in:
  //
  //   struct foo { ... }
  //   typedef int X;
  //
  // We'd really like to emit a missing semicolon error instead of emitting
  // an error on the 'int' saying that you can't have two type specifiers in
  // the same declaration of X.  Because of this, we look ahead past this
  // token to see if it's a type specifier.  If so, we know the code is
  // otherwise invalid, so we can produce the expected semi error.
  if (!isKnownToBeTypeSpecifier(NextToken()))
    return true;
  break;
case tok::r_brace:  // struct bar { struct foo {...} }
  // Missing ';' at end of struct is accepted as an extension in C mode.
  if (!getLangOpts().CPlusPlus)
    return true;
  break;
case tok::greater:
  // template<class T = class X>
  return getLangOpts().CPlusPlus;
}
return false;
1410}

1412/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1413/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1414/// until we reach the start of a definition or see a token that
1415/// cannot start a definition.
1416///
1417///       class-specifier: [C++ class]
1418///         class-head '{' member-specification[opt] '}'
1419///         class-head '{' member-specification[opt] '}' attributes[opt]
1420///       class-head:
1421///         class-key identifier[opt] base-clause[opt]
1422///         class-key nested-name-specifier identifier base-clause[opt]
1423///         class-key nested-name-specifier[opt] simple-template-id
1424///                          base-clause[opt]
1425/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
1426/// [GNU]   class-key attributes[opt] nested-name-specifier
1427///                          identifier base-clause[opt]
1428/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
1429///                          simple-template-id base-clause[opt]
1430///       class-key:
1431///         'class'
1432///         'struct'
1433///         'union'
1434///
1435///       elaborated-type-specifier: [C++ dcl.type.elab]
1436///         class-key ::[opt] nested-name-specifier[opt] identifier
1437///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1438///                          simple-template-id
1439///
1440///  Note that the C++ class-specifier and elaborated-type-specifier,
1441///  together, subsume the C99 struct-or-union-specifier:
1442///
1443///       struct-or-union-specifier: [C99 6.7.2.1]
1444///         struct-or-union identifier[opt] '{' struct-contents '}'
1445///         struct-or-union identifier
1446/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1447///                                                         '}' attributes[opt]
1448/// [GNU]   struct-or-union attributes[opt] identifier
1449///       struct-or-union:
1450///         'struct'
1451///         'union'
1452void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
                               SourceLocation StartLoc, DeclSpec &DS,
                               const ParsedTemplateInfo &TemplateInfo,
                               AccessSpecifier AS,
                               bool EnteringContext, DeclSpecContext DSC,
                               ParsedAttributesWithRange &Attributes) {
DeclSpec::TST TagType;
if (TagTokKind == tok::kw_struct)
  TagType = DeclSpec::TST_struct;
else if (TagTokKind == tok::kw___interface)
  TagType = DeclSpec::TST_interface;
else if (TagTokKind == tok::kw_class)
  TagType = DeclSpec::TST_class;
else {
  assert(TagTokKind == tok::kw_union && "Not a class specifier")(static_cast<void> (0));
  TagType = DeclSpec::TST_union;
}

if (Tok.is(tok::code_completion)) {
  // Code completion for a struct, class, or union name.
  cutOffParsing();
  Actions.CodeCompleteTag(getCurScope(), TagType);
  return;
}

// C++20 [temp.class.spec] 13.7.5/10
//   The usual access checking rules do not apply to non-dependent names
//   used to specify template arguments of the simple-template-id of the
//   partial specialization.
// C++20 [temp.spec] 13.9/6:
//   The usual access checking rules do not apply to names in a declaration
//   of an explicit instantiation or explicit specialization...
const bool shouldDelayDiagsInTag =
    (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate);
SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);

ParsedAttributesWithRange attrs(AttrFactory);
// If attributes exist after tag, parse them.
MaybeParseAttributes(PAKM_CXX11 | PAKM_Declspec | PAKM_GNU, attrs);

// Parse inheritance specifiers.
if (Tok.isOneOf(tok::kw___single_inheritance,
                tok::kw___multiple_inheritance,
                tok::kw___virtual_inheritance))
  ParseMicrosoftInheritanceClassAttributes(attrs);

// Allow attributes to precede or succeed the inheritance specifiers.
MaybeParseAttributes(PAKM_CXX11 | PAKM_Declspec | PAKM_GNU, attrs);

// Source location used by FIXIT to insert misplaced
// C++11 attributes
SourceLocation AttrFixitLoc = Tok.getLocation();

if (TagType == DeclSpec::TST_struct &&
    Tok.isNot(tok::identifier) &&
    !Tok.isAnnotation() &&
    Tok.getIdentifierInfo() &&
    Tok.isOneOf(tok::kw___is_abstract,
                tok::kw___is_aggregate,
                tok::kw___is_arithmetic,
                tok::kw___is_array,
                tok::kw___is_assignable,
                tok::kw___is_base_of,
                tok::kw___is_class,
                tok::kw___is_complete_type,
                tok::kw___is_compound,
                tok::kw___is_const,
                tok::kw___is_constructible,
                tok::kw___is_convertible,
                tok::kw___is_convertible_to,
                tok::kw___is_destructible,
                tok::kw___is_empty,
                tok::kw___is_enum,
                tok::kw___is_floating_point,
                tok::kw___is_final,
                tok::kw___is_function,
                tok::kw___is_fundamental,
                tok::kw___is_integral,
                tok::kw___is_interface_class,
                tok::kw___is_literal,
                tok::kw___is_lvalue_expr,
                tok::kw___is_lvalue_reference,
                tok::kw___is_member_function_pointer,
                tok::kw___is_member_object_pointer,
                tok::kw___is_member_pointer,
                tok::kw___is_nothrow_assignable,
                tok::kw___is_nothrow_constructible,
                tok::kw___is_nothrow_destructible,
                tok::kw___is_object,
                tok::kw___is_pod,
                tok::kw___is_pointer,
                tok::kw___is_polymorphic,
                tok::kw___is_reference,
                tok::kw___is_rvalue_expr,
                tok::kw___is_rvalue_reference,
                tok::kw___is_same,
                tok::kw___is_scalar,
                tok::kw___is_sealed,
                tok::kw___is_signed,
                tok::kw___is_standard_layout,
                tok::kw___is_trivial,
                tok::kw___is_trivially_assignable,
                tok::kw___is_trivially_constructible,
                tok::kw___is_trivially_copyable,
                tok::kw___is_union,
                tok::kw___is_unsigned,
                tok::kw___is_void,
                tok::kw___is_volatile))
  // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
  // name of struct templates, but some are keywords in GCC >= 4.3
  // and Clang. Therefore, when we see the token sequence "struct
  // X", make X into a normal identifier rather than a keyword, to
  // allow libstdc++ 4.2 and libc++ to work properly.
  TryKeywordIdentFallback(true);

struct PreserveAtomicIdentifierInfoRAII {
  PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled)
      : AtomicII(nullptr) {
    if (!Enabled)
      return;
    assert(Tok.is(tok::kw__Atomic))(static_cast<void> (0));
    AtomicII = Tok.getIdentifierInfo();
    AtomicII->revertTokenIDToIdentifier();
    Tok.setKind(tok::identifier);
  }
  ~PreserveAtomicIdentifierInfoRAII() {
    if (!AtomicII)
      return;
    AtomicII->revertIdentifierToTokenID(tok::kw__Atomic);
  }
  IdentifierInfo *AtomicII;
};

// HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
// implementation for VS2013 uses _Atomic as an identifier for one of the
// classes in <atomic>.  When we are parsing 'struct _Atomic', don't consider
// '_Atomic' to be a keyword.  We are careful to undo this so that clang can
// use '_Atomic' in its own header files.
bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat &&
                                      Tok.is(tok::kw__Atomic) &&
                                      TagType == DeclSpec::TST_struct;
PreserveAtomicIdentifierInfoRAII AtomicTokenGuard(
    Tok, ShouldChangeAtomicToIdentifier);

// Parse the (optional) nested-name-specifier.
CXXScopeSpec &SS = DS.getTypeSpecScope();
if (getLangOpts().CPlusPlus) {
  // "FOO : BAR" is not a potential typo for "FOO::BAR".  In this context it
  // is a base-specifier-list.
  ColonProtectionRAIIObject X(*this);

  CXXScopeSpec Spec;
  bool HasValidSpec = true;
  if (ParseOptionalCXXScopeSpecifier(Spec, /*ObjectType=*/nullptr,
                                     /*ObjectHadErrors=*/false,
                                     EnteringContext)) {
    DS.SetTypeSpecError();
    HasValidSpec = false;
  }
  if (Spec.isSet())
    if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) {
      Diag(Tok, diag::err_expected) << tok::identifier;
      HasValidSpec = false;
    }
  if (HasValidSpec)
    SS = Spec;
}

TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;

auto RecoverFromUndeclaredTemplateName = [&](IdentifierInfo *Name,
                                             SourceLocation NameLoc,
                                             SourceRange TemplateArgRange,
                                             bool KnownUndeclared) {
  Diag(NameLoc, diag::err_explicit_spec_non_template)
      << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
      << TagTokKind << Name << TemplateArgRange << KnownUndeclared;

  // Strip off the last template parameter list if it was empty, since
  // we've removed its template argument list.
  if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
    if (TemplateParams->size() > 1) {
      TemplateParams->pop_back();
    } else {
      TemplateParams = nullptr;
      const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
          ParsedTemplateInfo::NonTemplate;
    }
  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
    // Pretend this is just a forward declaration.
    TemplateParams = nullptr;
    const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
        ParsedTemplateInfo::NonTemplate;
    const_cast<ParsedTemplateInfo &>(TemplateInfo).TemplateLoc =
        SourceLocation();
    const_cast<ParsedTemplateInfo &>(TemplateInfo).ExternLoc =
        SourceLocation();
  }
};

// Parse the (optional) class name or simple-template-id.
IdentifierInfo *Name = nullptr;
SourceLocation NameLoc;
TemplateIdAnnotation *TemplateId = nullptr;
if (Tok.is(tok::identifier)) {
  Name = Tok.getIdentifierInfo();
  NameLoc = ConsumeToken();

  if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
    // The name was supposed to refer to a template, but didn't.
    // Eat the template argument list and try to continue parsing this as
    // a class (or template thereof).
    TemplateArgList TemplateArgs;
    SourceLocation LAngleLoc, RAngleLoc;
    if (ParseTemplateIdAfterTemplateName(true, LAngleLoc, TemplateArgs,
                                         RAngleLoc)) {
      // We couldn't parse the template argument list at all, so don't
      // try to give any location information for the list.
      LAngleLoc = RAngleLoc = SourceLocation();
    }
    RecoverFromUndeclaredTemplateName(
        Name, NameLoc, SourceRange(LAngleLoc, RAngleLoc), false);
  }
} else if (Tok.is(tok::annot_template_id)) {
  TemplateId = takeTemplateIdAnnotation(Tok);
  NameLoc = ConsumeAnnotationToken();

  if (TemplateId->Kind == TNK_Undeclared_template) {
    // Try to resolve the template name to a type template. May update Kind.
    Actions.ActOnUndeclaredTypeTemplateName(
        getCurScope(), TemplateId->Template, TemplateId->Kind, NameLoc, Name);
    if (TemplateId->Kind == TNK_Undeclared_template) {
      RecoverFromUndeclaredTemplateName(
          Name, NameLoc,
          SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc), true);
      TemplateId = nullptr;
    }
  }

  if (TemplateId && !TemplateId->mightBeType()) {
    // The template-name in the simple-template-id refers to
    // something other than a type template. Give an appropriate
    // error message and skip to the ';'.
    SourceRange Range(NameLoc);
    if (SS.isNotEmpty())
      Range.setBegin(SS.getBeginLoc());

    // FIXME: Name may be null here.
    Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
        << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;

    DS.SetTypeSpecError();
    SkipUntil(tok::semi, StopBeforeMatch);
    return;
  }
}

// There are four options here.
//  - If we are in a trailing return type, this is always just a reference,
//    and we must not try to parse a definition. For instance,
//      [] () -> struct S { };
//    does not define a type.
//  - If we have 'struct foo {...', 'struct foo :...',
//    'struct foo final :' or 'struct foo final {', then this is a definition.
//  - If we have 'struct foo;', then this is either a forward declaration
//    or a friend declaration, which have to be treated differently.
//  - Otherwise we have something like 'struct foo xyz', a reference.
//
//  We also detect these erroneous cases to provide better diagnostic for
//  C++11 attributes parsing.
//  - attributes follow class name:
//    struct foo [[]] {};
//  - attributes appear before or after 'final':
//    struct foo [[]] final [[]] {};
//
// However, in type-specifier-seq's, things look like declarations but are
// just references, e.g.
//   new struct s;
// or
//   &T::operator struct s;
// For these, DSC is DeclSpecContext::DSC_type_specifier or
// DeclSpecContext::DSC_alias_declaration.

// If there are attributes after class name, parse them.
MaybeParseCXX11Attributes(Attributes);

const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
Sema::TagUseKind TUK;
if (isDefiningTypeSpecifierContext(DSC) == AllowDefiningTypeSpec::No ||
    (getLangOpts().OpenMP && OpenMPDirectiveParsing))
  TUK = Sema::TUK_Reference;
else if (Tok.is(tok::l_brace) ||
         (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
         (isClassCompatibleKeyword() &&
          (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
  if (DS.isFriendSpecified()) {
    // C++ [class.friend]p2:
    //   A class shall not be defined in a friend declaration.
    Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
      << SourceRange(DS.getFriendSpecLoc());

    // Skip everything up to the semicolon, so that this looks like a proper
    // friend class (or template thereof) declaration.
    SkipUntil(tok::semi, StopBeforeMatch);
    TUK = Sema::TUK_Friend;
  } else {
    // Okay, this is a class definition.
    TUK = Sema::TUK_Definition;
  }
} else if (isClassCompatibleKeyword() &&
           (NextToken().is(tok::l_square) ||
            NextToken().is(tok::kw_alignas) ||
            isCXX11VirtSpecifier(NextToken()) != VirtSpecifiers::VS_None)) {
  // We can't tell if this is a definition or reference
  // until we skipped the 'final' and C++11 attribute specifiers.
  TentativeParsingAction PA(*this);

  // Skip the 'final', abstract'... keywords.
  while (isClassCompatibleKeyword()) {
    ConsumeToken();
  }

  // Skip C++11 attribute specifiers.
  while (true) {
    if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
      ConsumeBracket();
      if (!SkipUntil(tok::r_square, StopAtSemi))
        break;
    } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
      ConsumeToken();
      ConsumeParen();
      if (!SkipUntil(tok::r_paren, StopAtSemi))
        break;
    } else {
      break;
    }
  }

  if (Tok.isOneOf(tok::l_brace, tok::colon))
    TUK = Sema::TUK_Definition;
  else
    TUK = Sema::TUK_Reference;

  PA.Revert();
} else if (!isTypeSpecifier(DSC) &&
           (Tok.is(tok::semi) ||
            (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
  TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
  if (Tok.isNot(tok::semi)) {
    const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
    // A semicolon was missing after this declaration. Diagnose and recover.
    ExpectAndConsume(tok::semi, diag::err_expected_after,
                     DeclSpec::getSpecifierName(TagType, PPol));
    PP.EnterToken(Tok, /*IsReinject*/true);
    Tok.setKind(tok::semi);
  }
} else
  TUK = Sema::TUK_Reference;

// Forbid misplaced attributes. In cases of a reference, we pass attributes
// to caller to handle.
if (TUK != Sema::TUK_Reference) {
  // If this is not a reference, then the only possible
  // valid place for C++11 attributes to appear here
  // is between class-key and class-name. If there are
  // any attributes after class-name, we try a fixit to move
  // them to the right place.
  SourceRange AttrRange = Attributes.Range;
  if (AttrRange.isValid()) {
    Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
      << AttrRange
      << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
                                             CharSourceRange(AttrRange, true))
      << FixItHint::CreateRemoval(AttrRange);

    // Recover by adding misplaced attributes to the attribute list
    // of the class so they can be applied on the class later.
    attrs.takeAllFrom(Attributes);
  }
}

if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
                             TUK != Sema::TUK_Definition)) {
  if (DS.getTypeSpecType() != DeclSpec::TST_error) {
    // We have a declaration or reference to an anonymous class.
    Diag(StartLoc, diag::err_anon_type_definition)
      << DeclSpec::getSpecifierName(TagType, Policy);
  }

  // If we are parsing a definition and stop at a base-clause, continue on
  // until the semicolon.  Continuing from the comma will just trick us into
  // thinking we are seeing a variable declaration.
  if (TUK == Sema::TUK_Definition && Tok.is(tok::colon))
    SkipUntil(tok::semi, StopBeforeMatch);
  else
    SkipUntil(tok::comma, StopAtSemi);
  return;
}

// Create the tag portion of the class or class template.
DeclResult TagOrTempResult = true; // invalid
TypeResult TypeResult = true; // invalid

bool Owned = false;
Sema::SkipBodyInfo SkipBody;
if (TemplateId) {
  // Explicit specialization, class template partial specialization,
  // or explicit instantiation.
  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                     TemplateId->NumArgs);
  if (TemplateId->isInvalid()) {
    // Can't build the declaration.
  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
      TUK == Sema::TUK_Declaration) {
    // This is an explicit instantiation of a class template.
    ProhibitCXX11Attributes(attrs, diag::err_attributes_not_allowed,
                            /*DiagnoseEmptyAttrs=*/true);

    TagOrTempResult = Actions.ActOnExplicitInstantiation(
        getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
        TagType, StartLoc, SS, TemplateId->Template,
        TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr,
        TemplateId->RAngleLoc, attrs);

    // Friend template-ids are treated as references unless
    // they have template headers, in which case they're ill-formed
    // (FIXME: "template <class T> friend class A<T>::B<int>;").
    // We diagnose this error in ActOnClassTemplateSpecialization.
  } else if (TUK == Sema::TUK_Reference ||
             (TUK == Sema::TUK_Friend &&
              TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
    ProhibitCXX11Attributes(attrs, diag::err_attributes_not_allowed,
                            /*DiagnoseEmptyAttrs=*/true);
    TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
                                                SS,
                                                TemplateId->TemplateKWLoc,
                                                TemplateId->Template,
                                                TemplateId->TemplateNameLoc,
                                                TemplateId->LAngleLoc,
                                                TemplateArgsPtr,
                                                TemplateId->RAngleLoc);
  } else {
    // This is an explicit specialization or a class template
    // partial specialization.
    TemplateParameterLists FakedParamLists;
    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
      // This looks like an explicit instantiation, because we have
      // something like
      //
      //   template class Foo<X>
      //
      // but it actually has a definition. Most likely, this was
      // meant to be an explicit specialization, but the user forgot
      // the '<>' after 'template'.
      // It this is friend declaration however, since it cannot have a
      // template header, it is most likely that the user meant to
      // remove the 'template' keyword.
      assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&(static_cast<void> (0))
             "Expected a definition here")(static_cast<void> (0));

      if (TUK == Sema::TUK_Friend) {
        Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation);
        TemplateParams = nullptr;
      } else {
        SourceLocation LAngleLoc =
            PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
        Diag(TemplateId->TemplateNameLoc,
             diag::err_explicit_instantiation_with_definition)
            << SourceRange(TemplateInfo.TemplateLoc)
            << FixItHint::CreateInsertion(LAngleLoc, "<>");

        // Create a fake template parameter list that contains only
        // "template<>", so that we treat this construct as a class
        // template specialization.
        FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
            0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
            LAngleLoc, nullptr));
        TemplateParams = &FakedParamLists;
      }
    }

    // Build the class template specialization.
    TagOrTempResult = Actions.ActOnClassTemplateSpecialization(
        getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(),
        SS, *TemplateId, attrs,
        MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0]
                                              : nullptr,
                               TemplateParams ? TemplateParams->size() : 0),
        &SkipBody);
  }
} else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
           TUK == Sema::TUK_Declaration) {
  // Explicit instantiation of a member of a class template
  // specialization, e.g.,
  //
  //   template struct Outer<int>::Inner;
  //
  ProhibitAttributes(attrs);

  TagOrTempResult = Actions.ActOnExplicitInstantiation(
      getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
      TagType, StartLoc, SS, Name, NameLoc, attrs);
} else if (TUK == Sema::TUK_Friend &&
           TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
  ProhibitCXX11Attributes(attrs, diag::err_attributes_not_allowed,
                          /*DiagnoseEmptyAttrs=*/true);

  TagOrTempResult = Actions.ActOnTemplatedFriendTag(
      getCurScope(), DS.getFriendSpecLoc(), TagType, StartLoc, SS, Name,
      NameLoc, attrs,
      MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0] : nullptr,
                             TemplateParams ? TemplateParams->size() : 0));
} else {
  if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
    ProhibitCXX11Attributes(attrs, diag::err_attributes_not_allowed,
                            /* DiagnoseEmptyAttrs=*/true);

  if (TUK == Sema::TUK_Definition &&
      TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
    // If the declarator-id is not a template-id, issue a diagnostic and
    // recover by ignoring the 'template' keyword.
    Diag(Tok, diag::err_template_defn_explicit_instantiation)
      << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
    TemplateParams = nullptr;
  }

  bool IsDependent = false;

  // Don't pass down template parameter lists if this is just a tag
  // reference.  For example, we don't need the template parameters here:
  //   template <class T> class A *makeA(T t);
  MultiTemplateParamsArg TParams;
  if (TUK != Sema::TUK_Reference && TemplateParams)
    TParams =
      MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());

  stripTypeAttributesOffDeclSpec(attrs, DS, TUK);

  // Declaration or definition of a class type
  TagOrTempResult = Actions.ActOnTag(
      getCurScope(), TagType, TUK, StartLoc, SS, Name, NameLoc, attrs, AS,
      DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent,
      SourceLocation(), false, clang::TypeResult(),
      DSC == DeclSpecContext::DSC_type_specifier,
      DSC == DeclSpecContext::DSC_template_param ||
          DSC == DeclSpecContext::DSC_template_type_arg,
      &SkipBody);

  // If ActOnTag said the type was dependent, try again with the
  // less common call.
  if (IsDependent) {
    assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend)(static_cast<void> (0));
    TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
                                           SS, Name, StartLoc, NameLoc);
  }
}

// If this is an elaborated type specifier in function template,
// and we delayed diagnostics before,
// just merge them into the current pool.
if (shouldDelayDiagsInTag) {
  diagsFromTag.done();
  if (TUK == Sema::TUK_Reference &&
      TemplateInfo.Kind == ParsedTemplateInfo::Template)
    diagsFromTag.redelay();
}

// If there is a body, parse it and inform the actions module.
if (TUK == Sema::TUK_Definition) {
  assert(Tok.is(tok::l_brace) ||(static_cast<void> (0))
         (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||(static_cast<void> (0))
         isClassCompatibleKeyword())(static_cast<void> (0));
  if (SkipBody.ShouldSkip)
    SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType,
                               TagOrTempResult.get());
  else if (getLangOpts().CPlusPlus)
    ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
                                TagOrTempResult.get());
  else {
    Decl *D =
        SkipBody.CheckSameAsPrevious ? SkipBody.New : TagOrTempResult.get();
    // Parse the definition body.
    ParseStructUnionBody(StartLoc, TagType, cast<RecordDecl>(D));
    if (SkipBody.CheckSameAsPrevious &&
        !Actions.ActOnDuplicateDefinition(DS, TagOrTempResult.get(),
                                          SkipBody)) {
      DS.SetTypeSpecError();
      return;
    }
  }
}

if (!TagOrTempResult.isInvalid())
  // Delayed processing of attributes.
  Actions.ProcessDeclAttributeDelayed(TagOrTempResult.get(), attrs);

const char *PrevSpec = nullptr;
unsigned DiagID;
bool Result;
if (!TypeResult.isInvalid()) {
  Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
                              NameLoc.isValid() ? NameLoc : StartLoc,
                              PrevSpec, DiagID, TypeResult.get(), Policy);
} else if (!TagOrTempResult.isInvalid()) {
  Result = DS.SetTypeSpecType(TagType, StartLoc,
                              NameLoc.isValid() ? NameLoc : StartLoc,
                              PrevSpec, DiagID, TagOrTempResult.get(), Owned,
                              Policy);
} else {
  DS.SetTypeSpecError();
  return;
}

if (Result)
  Diag(StartLoc, DiagID) << PrevSpec;

// At this point, we've successfully parsed a class-specifier in 'definition'
// form (e.g. "struct foo { int x; }".  While we could just return here, we're
// going to look at what comes after it to improve error recovery.  If an
// impossible token occurs next, we assume that the programmer forgot a ; at
// the end of the declaration and recover that way.
//
// Also enforce C++ [temp]p3:
//   In a template-declaration which defines a class, no declarator
//   is permitted.
//
// After a type-specifier, we don't expect a semicolon. This only happens in
// C, since definitions are not permitted in this context in C++.
if (TUK == Sema::TUK_Definition &&
    (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) &&
    (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
  if (Tok.isNot(tok::semi)) {
    const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
    ExpectAndConsume(tok::semi, diag::err_expected_after,
                     DeclSpec::getSpecifierName(TagType, PPol));
    // Push this token back into the preprocessor and change our current token
    // to ';' so that the rest of the code recovers as though there were an
    // ';' after the definition.
    PP.EnterToken(Tok, /*IsReinject=*/true);
    Tok.setKind(tok::semi);
  }
}
2094}

2096/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
2097///
2098///       base-clause : [C++ class.derived]
2099///         ':' base-specifier-list
2100///       base-specifier-list:
2101///         base-specifier '...'[opt]
2102///         base-specifier-list ',' base-specifier '...'[opt]
2103void Parser::ParseBaseClause(Decl *ClassDecl) {
assert(Tok.is(tok::colon) && "Not a base clause")(static_cast<void> (0));
ConsumeToken();

// Build up an array of parsed base specifiers.
SmallVector<CXXBaseSpecifier *, 8> BaseInfo;

while (true) {
  // Parse a base-specifier.
  BaseResult Result = ParseBaseSpecifier(ClassDecl);
  if (Result.isInvalid()) {
    // Skip the rest of this base specifier, up until the comma or
    // opening brace.
    SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch);
  } else {
    // Add this to our array of base specifiers.
    BaseInfo.push_back(Result.get());
  }

  // If the next token is a comma, consume it and keep reading
  // base-specifiers.
  if (!TryConsumeToken(tok::comma))
    break;
}

// Attach the base specifiers
Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo);
2130}

2132/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
2133/// one entry in the base class list of a class specifier, for example:
2134///    class foo : public bar, virtual private baz {
2135/// 'public bar' and 'virtual private baz' are each base-specifiers.
2136///
2137///       base-specifier: [C++ class.derived]
2138///         attribute-specifier-seq[opt] base-type-specifier
2139///         attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
2140///                 base-type-specifier
2141///         attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
2142///                 base-type-specifier
2143BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
bool IsVirtual = false;
SourceLocation StartLoc = Tok.getLocation();

ParsedAttributesWithRange Attributes(AttrFactory);
MaybeParseCXX11Attributes(Attributes);

// Parse the 'virtual' keyword.
if (TryConsumeToken(tok::kw_virtual))
  IsVirtual = true;

CheckMisplacedCXX11Attribute(Attributes, StartLoc);

// Parse an (optional) access specifier.
AccessSpecifier Access = getAccessSpecifierIfPresent();
if (Access != AS_none)
  ConsumeToken();

CheckMisplacedCXX11Attribute(Attributes, StartLoc);

// Parse the 'virtual' keyword (again!), in case it came after the
// access specifier.
if (Tok.is(tok::kw_virtual))  {
  SourceLocation VirtualLoc = ConsumeToken();
  if (IsVirtual) {
    // Complain about duplicate 'virtual'
    Diag(VirtualLoc, diag::err_dup_virtual)
      << FixItHint::CreateRemoval(VirtualLoc);
  }

  IsVirtual = true;
}

CheckMisplacedCXX11Attribute(Attributes, StartLoc);

// Parse the class-name.

// HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
// implementation for VS2013 uses _Atomic as an identifier for one of the
// classes in <atomic>.  Treat '_Atomic' to be an identifier when we are
// parsing the class-name for a base specifier.
if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
    NextToken().is(tok::less))
  Tok.setKind(tok::identifier);

SourceLocation EndLocation;
SourceLocation BaseLoc;
TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
if (BaseType.isInvalid())
  return true;

// Parse the optional ellipsis (for a pack expansion). The ellipsis is
// actually part of the base-specifier-list grammar productions, but we
// parse it here for convenience.
SourceLocation EllipsisLoc;
TryConsumeToken(tok::ellipsis, EllipsisLoc);

// Find the complete source range for the base-specifier.
SourceRange Range(StartLoc, EndLocation);

// Notify semantic analysis that we have parsed a complete
// base-specifier.
return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
                                  Access, BaseType.get(), BaseLoc,
                                  EllipsisLoc);
2208}

2210/// getAccessSpecifierIfPresent - Determine whether the next token is
2211/// a C++ access-specifier.
2212///
2213///       access-specifier: [C++ class.derived]
2214///         'private'
2215///         'protected'
2216///         'public'
2217AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
switch (Tok.getKind()) {
default: return AS_none;
case tok::kw_private: return AS_private;
case tok::kw_protected: return AS_protected;
case tok::kw_public: return AS_public;
}
2224}

2226/// If the given declarator has any parts for which parsing has to be
2227/// delayed, e.g., default arguments or an exception-specification, create a
2228/// late-parsed method declaration record to handle the parsing at the end of
2229/// the class definition.
2230void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
                                          Decl *ThisDecl) {
DeclaratorChunk::FunctionTypeInfo &FTI
  = DeclaratorInfo.getFunctionTypeInfo();
// If there was a late-parsed exception-specification, we'll need a
// late parse
bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed;

if (!NeedLateParse) {
  // Look ahead to see if there are any default args
  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) {
    auto Param = cast<ParmVarDecl>(FTI.Params[ParamIdx].Param);
    if (Param->hasUnparsedDefaultArg()) {
      NeedLateParse = true;
      break;
    }
  }
}

if (NeedLateParse) {
  // Push this method onto the stack of late-parsed method
  // declarations.
  auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
  getCurrentClass().LateParsedDeclarations.push_back(LateMethod);

  // Push tokens for each parameter. Those that do not have defaults will be
  // NULL. We need to track all the parameters so that we can push them into
  // scope for later parameters and perhaps for the exception specification.
  LateMethod->DefaultArgs.reserve(FTI.NumParams);
  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx)
    LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument(
        FTI.Params[ParamIdx].Param,
        std::move(FTI.Params[ParamIdx].DefaultArgTokens)));

  // Stash the exception-specification tokens in the late-pased method.
  if (FTI.getExceptionSpecType() == EST_Unparsed) {
    LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
    FTI.ExceptionSpecTokens = nullptr;
  }
}
2270}

2272/// isCXX11VirtSpecifier - Determine whether the given token is a C++11
2273/// virt-specifier.
2274///
2275///       virt-specifier:
2276///         override
2277///         final
2278///         __final
2279VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier))
  return VirtSpecifiers::VS_None;

IdentifierInfo *II = Tok.getIdentifierInfo();

// Initialize the contextual keywords.
if (!Ident_final) {
  Ident_final = &PP.getIdentifierTable().get("final");
  if (getLangOpts().GNUKeywords)
    Ident_GNU_final = &PP.getIdentifierTable().get("__final");
  if (getLangOpts().MicrosoftExt) {
    Ident_sealed = &PP.getIdentifierTable().get("sealed");
    Ident_abstract = &PP.getIdentifierTable().get("abstract");
  }
  Ident_override = &PP.getIdentifierTable().get("override");
}

if (II == Ident_override)
  return VirtSpecifiers::VS_Override;

if (II == Ident_sealed)
  return VirtSpecifiers::VS_Sealed;

if (II == Ident_abstract)
  return VirtSpecifiers::VS_Abstract;

if (II == Ident_final)
  return VirtSpecifiers::VS_Final;

if (II == Ident_GNU_final)
  return VirtSpecifiers::VS_GNU_Final;

return VirtSpecifiers::VS_None;
2313}

2315/// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
2316///
2317///       virt-specifier-seq:
2318///         virt-specifier
2319///         virt-specifier-seq virt-specifier
2320void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
                                              bool IsInterface,
                                              SourceLocation FriendLoc) {
while (true) {
  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
  if (Specifier == VirtSpecifiers::VS_None)
    return;

  if (FriendLoc.isValid()) {
    Diag(Tok.getLocation(), diag::err_friend_decl_spec)
      << VirtSpecifiers::getSpecifierName(Specifier)
      << FixItHint::CreateRemoval(Tok.getLocation())
      << SourceRange(FriendLoc, FriendLoc);
    ConsumeToken();
    continue;
  }

  // C++ [class.mem]p8:
  //   A virt-specifier-seq shall contain at most one of each virt-specifier.
  const char *PrevSpec = nullptr;
  if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
    Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
      << PrevSpec
      << FixItHint::CreateRemoval(Tok.getLocation());

  if (IsInterface && (Specifier == VirtSpecifiers::VS_Final ||
                      Specifier == VirtSpecifiers::VS_Sealed)) {
    Diag(Tok.getLocation(), diag::err_override_control_interface)
      << VirtSpecifiers::getSpecifierName(Specifier);
  } else if (Specifier == VirtSpecifiers::VS_Sealed) {
    Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword);
  } else if (Specifier == VirtSpecifiers::VS_Abstract) {
    Diag(Tok.getLocation(), diag::ext_ms_abstract_keyword);
  } else if (Specifier == VirtSpecifiers::VS_GNU_Final) {
    Diag(Tok.getLocation(), diag::ext_warn_gnu_final);
  } else {
    Diag(Tok.getLocation(),
         getLangOpts().CPlusPlus11
             ? diag::warn_cxx98_compat_override_control_keyword
             : diag::ext_override_control_keyword)
        << VirtSpecifiers::getSpecifierName(Specifier);
  }
  ConsumeToken();
}
2364}

2366/// isCXX11FinalKeyword - Determine whether the next token is a C++11
2367/// 'final' or Microsoft 'sealed' contextual keyword.
2368bool Parser::isCXX11FinalKeyword() const {
VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
return Specifier == VirtSpecifiers::VS_Final ||
       Specifier == VirtSpecifiers::VS_GNU_Final ||
       Specifier == VirtSpecifiers::VS_Sealed;
2373}

2375/// isClassCompatibleKeyword - Determine whether the next token is a C++11
2376/// 'final' or Microsoft 'sealed' or 'abstract' contextual keywords.
2377bool Parser::isClassCompatibleKeyword() const {
VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
return Specifier == VirtSpecifiers::VS_Final ||
       Specifier == VirtSpecifiers::VS_GNU_Final ||
       Specifier == VirtSpecifiers::VS_Sealed ||
       Specifier == VirtSpecifiers::VS_Abstract;
2383}

2385/// Parse a C++ member-declarator up to, but not including, the optional
2386/// brace-or-equal-initializer or pure-specifier.
2387bool Parser::ParseCXXMemberDeclaratorBeforeInitializer(
  Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize,
  LateParsedAttrList &LateParsedAttrs) {
// member-declarator:
//   declarator virt-specifier-seq[opt] pure-specifier[opt]
//   declarator requires-clause
//   declarator brace-or-equal-initializer[opt]
//   identifier attribute-specifier-seq[opt] ':' constant-expression
//       brace-or-equal-initializer[opt]
//   ':' constant-expression
//
// NOTE: the latter two productions are a proposed bugfix rather than the
// current grammar rules as of C++20.
if (Tok.isNot(tok::colon))
  ParseDeclarator(DeclaratorInfo);
else
  DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation());

if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) {
  assert(DeclaratorInfo.isPastIdentifier() &&(static_cast<void> (0))
         "don't know where identifier would go yet?")(static_cast<void> (0));
  BitfieldSize = ParseConstantExpression();
  if (BitfieldSize.isInvalid())
    SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
} else if (Tok.is(tok::kw_requires)) {
  ParseTrailingRequiresClause(DeclaratorInfo);
} else {
  ParseOptionalCXX11VirtSpecifierSeq(
      VS, getCurrentClass().IsInterface,
      DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
  if (!VS.isUnset())
    MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
}

// If a simple-asm-expr is present, parse it.
if (Tok.is(tok::kw_asm)) {
  SourceLocation Loc;
  ExprResult AsmLabel(ParseSimpleAsm(/*ForAsmLabel*/ true, &Loc));
  if (AsmLabel.isInvalid())
    SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);

  DeclaratorInfo.setAsmLabel(AsmLabel.get());
  DeclaratorInfo.SetRangeEnd(Loc);
}

// If attributes exist after the declarator, but before an '{', parse them.
// However, this does not apply for [[]] attributes (which could show up
// before or after the __attribute__ attributes).
DiagnoseAndSkipCXX11Attributes();
MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
DiagnoseAndSkipCXX11Attributes();

// For compatibility with code written to older Clang, also accept a
// virt-specifier *after* the GNU attributes.
if (BitfieldSize.isUnset() && VS.isUnset()) {
  ParseOptionalCXX11VirtSpecifierSeq(
      VS, getCurrentClass().IsInterface,
      DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
  if (!VS.isUnset()) {
    // If we saw any GNU-style attributes that are known to GCC followed by a
    // virt-specifier, issue a GCC-compat warning.
    for (const ParsedAttr &AL : DeclaratorInfo.getAttributes())
      if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
        Diag(AL.getLoc(), diag::warn_gcc_attribute_location);

    MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
  }
}

// If this has neither a name nor a bit width, something has gone seriously
// wrong. Skip until the semi-colon or }.
if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) {
  // If so, skip until the semi-colon or a }.
  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
  return true;
}
return false;
2464}

2466/// Look for declaration specifiers possibly occurring after C++11
2467/// virt-specifier-seq and diagnose them.
2468void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(
  Declarator &D,
  VirtSpecifiers &VS) {
DeclSpec DS(AttrFactory);

// GNU-style and C++11 attributes are not allowed here, but they will be
// handled by the caller.  Diagnose everything else.
ParseTypeQualifierListOpt(
    DS, AR_NoAttributesParsed, false,
    /*IdentifierRequired=*/false, llvm::function_ref<void()>([&]() {
      Actions.CodeCompleteFunctionQualifiers(DS, D, &VS);
    }));
D.ExtendWithDeclSpec(DS);

if (D.isFunctionDeclarator()) {
  auto &Function = D.getFunctionTypeInfo();
  if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
    auto DeclSpecCheck = [&](DeclSpec::TQ TypeQual, StringRef FixItName,
                             SourceLocation SpecLoc) {
      FixItHint Insertion;
      auto &MQ = Function.getOrCreateMethodQualifiers();
      if (!(MQ.getTypeQualifiers() & TypeQual)) {
        std::string Name(FixItName.data());
        Name += " ";
        Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
        MQ.SetTypeQual(TypeQual, SpecLoc);
      }
      Diag(SpecLoc, diag::err_declspec_after_virtspec)
          << FixItName
          << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
          << FixItHint::CreateRemoval(SpecLoc) << Insertion;
    };
    DS.forEachQualifier(DeclSpecCheck);
  }

  // Parse ref-qualifiers.
  bool RefQualifierIsLValueRef = true;
  SourceLocation RefQualifierLoc;
  if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) {
    const char *Name = (RefQualifierIsLValueRef ? "& " : "&& ");
    FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
    Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef;
    Function.RefQualifierLoc = RefQualifierLoc;

    Diag(RefQualifierLoc, diag::err_declspec_after_virtspec)
      << (RefQualifierIsLValueRef ? "&" : "&&")
      << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
      << FixItHint::CreateRemoval(RefQualifierLoc)
      << Insertion;
    D.SetRangeEnd(RefQualifierLoc);
  }
}
2520}

2522/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
2523///
2524///       member-declaration:
2525///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
2526///         function-definition ';'[opt]
2527///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
2528///         using-declaration                                            [TODO]
2529/// [C++0x] static_assert-declaration
2530///         template-declaration
2531/// [GNU]   '__extension__' member-declaration
2532///
2533///       member-declarator-list:
2534///         member-declarator
2535///         member-declarator-list ',' member-declarator
2536///
2537///       member-declarator:
2538///         declarator virt-specifier-seq[opt] pure-specifier[opt]
2539/// [C++2a] declarator requires-clause
2540///         declarator constant-initializer[opt]
2541/// [C++11] declarator brace-or-equal-initializer[opt]
2542///         identifier[opt] ':' constant-expression
2543///
2544///       virt-specifier-seq:
2545///         virt-specifier
2546///         virt-specifier-seq virt-specifier
2547///
2548///       virt-specifier:
2549///         override
2550///         final
2551/// [MS]    sealed
2552///
2553///       pure-specifier:
2554///         '= 0'
2555///
2556///       constant-initializer:
2557///         '=' constant-expression
2558///
2559Parser::DeclGroupPtrTy
2560Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
                                     ParsedAttributes &AccessAttrs,
                                     const ParsedTemplateInfo &TemplateInfo,
                                     ParsingDeclRAIIObject *TemplateDiags) {
if (Tok.is(tok::at)) {
  if (getLangOpts().ObjC && NextToken().isObjCAtKeyword(tok::objc_defs))
    Diag(Tok, diag::err_at_defs_cxx);
  else
    Diag(Tok, diag::err_at_in_class);

  ConsumeToken();
  SkipUntil(tok::r_brace, StopAtSemi);
  return nullptr;
}

// Turn on colon protection early, while parsing declspec, although there is
// nothing to protect there. It prevents from false errors if error recovery
// incorrectly determines where the declspec ends, as in the example:
//   struct A { enum class B { C }; };
//   const int C = 4;
//   struct D { A::B : C; };
ColonProtectionRAIIObject X(*this);

// Access declarations.
bool MalformedTypeSpec = false;
if (!TemplateInfo.Kind &&
    Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
  if (TryAnnotateCXXScopeToken())
    MalformedTypeSpec = true;

  bool isAccessDecl;
  if (Tok.isNot(tok::annot_cxxscope))
    isAccessDecl = false;
  else if (NextToken().is(tok::identifier))
    isAccessDecl = GetLookAheadToken(2).is(tok::semi);
  else
    isAccessDecl = NextToken().is(tok::kw_operator);

  if (isAccessDecl) {
    // Collect the scope specifier token we annotated earlier.
    CXXScopeSpec SS;
    ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
                                   /*ObjectHadErrors=*/false,
                                   /*EnteringContext=*/false);

    if (SS.isInvalid()) {
      SkipUntil(tok::semi);
      return nullptr;
    }

    // Try to parse an unqualified-id.
    SourceLocation TemplateKWLoc;
    UnqualifiedId Name;
    if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
                           /*ObjectHadErrors=*/false, false, true, true,
                           false, &TemplateKWLoc, Name)) {
      SkipUntil(tok::semi);
      return nullptr;
    }

    // TODO: recover from mistakenly-qualified operator declarations.
    if (ExpectAndConsume(tok::semi, diag::err_expected_after,
                         "access declaration")) {
      SkipUntil(tok::semi);
      return nullptr;
    }

    // FIXME: We should do something with the 'template' keyword here.
    return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration(
        getCurScope(), AS, /*UsingLoc*/ SourceLocation(),
        /*TypenameLoc*/ SourceLocation(), SS, Name,
        /*EllipsisLoc*/ SourceLocation(),
        /*AttrList*/ ParsedAttributesView())));
  }
}

// static_assert-declaration. A templated static_assert declaration is
// diagnosed in Parser::ParseSingleDeclarationAfterTemplate.
if (!TemplateInfo.Kind &&
    Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) {
  SourceLocation DeclEnd;
  return DeclGroupPtrTy::make(
      DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd)));
}

if (Tok.is(tok::kw_template)) {
  assert(!TemplateInfo.TemplateParams &&(static_cast<void> (0))
         "Nested template improperly parsed?")(static_cast<void> (0));
  ObjCDeclContextSwitch ObjCDC(*this);
  SourceLocation DeclEnd;
  return DeclGroupPtrTy::make(
      DeclGroupRef(ParseTemplateDeclarationOrSpecialization(
          DeclaratorContext::Member, DeclEnd, AccessAttrs, AS)));
}

// Handle:  member-declaration ::= '__extension__' member-declaration
if (Tok.is(tok::kw___extension__)) {
  // __extension__ silences extension warnings in the subexpression.
  ExtensionRAIIObject O(Diags);  // Use RAII to do this.
  ConsumeToken();
  return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
                                        TemplateInfo, TemplateDiags);
}

ParsedAttributesWithRange attrs(AttrFactory);
ParsedAttributesViewWithRange FnAttrs;
// Optional C++11 attribute-specifier
MaybeParseCXX11Attributes(attrs);

// The next token may be an OpenMP pragma annotation token. That would
// normally be handled from ParseCXXClassMemberDeclarationWithPragmas, but in
// this case, it came from an *attribute* rather than a pragma. Handle it now.
if (Tok.is(tok::annot_attr_openmp))
  return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);

// We need to keep these attributes for future diagnostic
// before they are taken over by declaration specifier.
FnAttrs.addAll(attrs.begin(), attrs.end());
FnAttrs.Range = attrs.Range;

MaybeParseMicrosoftAttributes(attrs);

if (Tok.is(tok::kw_using)) {
  // Eat 'using'.
  SourceLocation UsingLoc = ConsumeToken();

  // Consume unexpected 'template' keywords.
  while (Tok.is(tok::kw_template)) {
    SourceLocation TemplateLoc = ConsumeToken();
    Diag(TemplateLoc, diag::err_unexpected_template_after_using)
        << FixItHint::CreateRemoval(TemplateLoc);
  }

  if (Tok.is(tok::kw_namespace)) {
    Diag(UsingLoc, diag::err_using_namespace_in_class);
    SkipUntil(tok::semi, StopBeforeMatch);
    return nullptr;
  }
  SourceLocation DeclEnd;
  // Otherwise, it must be a using-declaration or an alias-declaration.
  return ParseUsingDeclaration(DeclaratorContext::Member, TemplateInfo,
                               UsingLoc, DeclEnd, attrs, AS);
}

// Hold late-parsed attributes so we can attach a Decl to them later.
LateParsedAttrList CommonLateParsedAttrs;

// decl-specifier-seq:
// Parse the common declaration-specifiers piece.
ParsingDeclSpec DS(*this, TemplateDiags);
DS.takeAttributesFrom(attrs);
if (MalformedTypeSpec)
  DS.SetTypeSpecError();

// Turn off usual access checking for templates explicit specialization
// and instantiation.
// C++20 [temp.spec] 13.9/6.
// This disables the access checking rules for member function template
// explicit instantiation and explicit specialization.
bool IsTemplateSpecOrInst =
    (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
     TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
SuppressAccessChecks diagsFromTag(*this, IsTemplateSpecOrInst);

ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DeclSpecContext::DSC_class,
                           &CommonLateParsedAttrs);

if (IsTemplateSpecOrInst)
  diagsFromTag.done();

// Turn off colon protection that was set for declspec.
X.restore();

// If we had a free-standing type definition with a missing semicolon, we
// may get this far before the problem becomes obvious.
if (DS.hasTagDefinition() &&
    TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate &&
    DiagnoseMissingSemiAfterTagDefinition(DS, AS, DeclSpecContext::DSC_class,
                                          &CommonLateParsedAttrs))
  return nullptr;

MultiTemplateParamsArg TemplateParams(
    TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data()
                               : nullptr,
    TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);

if (TryConsumeToken(tok::semi)) {
  if (DS.isFriendSpecified())
    ProhibitAttributes(FnAttrs);

  RecordDecl *AnonRecord = nullptr;
  Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
      getCurScope(), AS, DS, TemplateParams, false, AnonRecord);
  DS.complete(TheDecl);
  if (AnonRecord) {
    Decl* decls[] = {AnonRecord, TheDecl};
    return Actions.BuildDeclaratorGroup(decls);
  }
  return Actions.ConvertDeclToDeclGroup(TheDecl);
}

ParsingDeclarator DeclaratorInfo(*this, DS, DeclaratorContext::Member);
if (TemplateInfo.TemplateParams)
  DeclaratorInfo.setTemplateParameterLists(TemplateParams);
VirtSpecifiers VS;

// Hold late-parsed attributes so we can attach a Decl to them later.
LateParsedAttrList LateParsedAttrs;

SourceLocation EqualLoc;
SourceLocation PureSpecLoc;

auto TryConsumePureSpecifier = [&] (bool AllowDefinition) {
  if (Tok.isNot(tok::equal))
    return false;

  auto &Zero = NextToken();
  SmallString<8> Buffer;
  if (Zero.isNot(tok::numeric_constant) ||
      PP.getSpelling(Zero, Buffer) != "0")
    return false;

  auto &After = GetLookAheadToken(2);
  if (!After.isOneOf(tok::semi, tok::comma) &&
      !(AllowDefinition &&
        After.isOneOf(tok::l_brace, tok::colon, tok::kw_try)))
    return false;

  EqualLoc = ConsumeToken();
  PureSpecLoc = ConsumeToken();
  return true;
};

SmallVector<Decl *, 8> DeclsInGroup;
ExprResult BitfieldSize;
ExprResult TrailingRequiresClause;
bool ExpectSemi = true;

// C++20 [temp.spec] 13.9/6.
// This disables the access checking rules for member function template
// explicit instantiation and explicit specialization.
SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);

// Parse the first declarator.
if (ParseCXXMemberDeclaratorBeforeInitializer(
        DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) {
  TryConsumeToken(tok::semi);
  return nullptr;
}

if (IsTemplateSpecOrInst)
  SAC.done();

// Check for a member function definition.
if (BitfieldSize.isUnset()) {
  // MSVC permits pure specifier on inline functions defined at class scope.
  // Hence check for =0 before checking for function definition.
  if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction())
    TryConsumePureSpecifier(/*AllowDefinition*/ true);

  FunctionDefinitionKind DefinitionKind = FunctionDefinitionKind::Declaration;
  // function-definition:
  //
  // In C++11, a non-function declarator followed by an open brace is a
  // braced-init-list for an in-class member initialization, not an
  // erroneous function definition.
  if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
    DefinitionKind = FunctionDefinitionKind::Definition;
  } else if (DeclaratorInfo.isFunctionDeclarator()) {
    if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) {
      DefinitionKind = FunctionDefinitionKind::Definition;
    } else if (Tok.is(tok::equal)) {
      const Token &KW = NextToken();
      if (KW.is(tok::kw_default))
        DefinitionKind = FunctionDefinitionKind::Defaulted;
      else if (KW.is(tok::kw_delete))
        DefinitionKind = FunctionDefinitionKind::Deleted;
      else if (KW.is(tok::code_completion)) {
        cutOffParsing();
        Actions.CodeCompleteAfterFunctionEquals(DeclaratorInfo);
        return nullptr;
      }
    }
  }
  DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind);

  // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
  // to a friend declaration, that declaration shall be a definition.
  if (DeclaratorInfo.isFunctionDeclarator() &&
      DefinitionKind == FunctionDefinitionKind::Declaration &&
      DS.isFriendSpecified()) {
    // Diagnose attributes that appear before decl specifier:
    // [[]] friend int foo();
    ProhibitAttributes(FnAttrs);
  }

  if (DefinitionKind != FunctionDefinitionKind::Declaration) {
    if (!DeclaratorInfo.isFunctionDeclarator()) {
      Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
      ConsumeBrace();
      SkipUntil(tok::r_brace);

      // Consume the optional ';'
      TryConsumeToken(tok::semi);

      return nullptr;
    }

    if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
      Diag(DeclaratorInfo.getIdentifierLoc(),
           diag::err_function_declared_typedef);

      // Recover by treating the 'typedef' as spurious.
      DS.ClearStorageClassSpecs();
    }

    Decl *FunDecl =
      ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
                              VS, PureSpecLoc);

    if (FunDecl) {
      for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
        CommonLateParsedAttrs[i]->addDecl(FunDecl);
      }
      for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
        LateParsedAttrs[i]->addDecl(FunDecl);
      }
    }
    LateParsedAttrs.clear();

    // Consume the ';' - it's optional unless we have a delete or default
    if (Tok.is(tok::semi))
      ConsumeExtraSemi(AfterMemberFunctionDefinition);

    return DeclGroupPtrTy::make(DeclGroupRef(FunDecl));
  }
}

// member-declarator-list:
//   member-declarator
//   member-declarator-list ',' member-declarator

while (1) {
  InClassInitStyle HasInClassInit = ICIS_NoInit;
  bool HasStaticInitializer = false;
  if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
    // DRXXXX: Anonymous bit-fields cannot have a brace-or-equal-initializer.
    if (BitfieldSize.isUsable() && !DeclaratorInfo.hasName()) {
      // Diagnose the error and pretend there is no in-class initializer.
      Diag(Tok, diag::err_anon_bitfield_member_init);
      SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
    } else if (DeclaratorInfo.isDeclarationOfFunction()) {
      // It's a pure-specifier.
      if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false))
        // Parse it as an expression so that Sema can diagnose it.
        HasStaticInitializer = true;
    } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
                   DeclSpec::SCS_static &&
               DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
                   DeclSpec::SCS_typedef &&
               !DS.isFriendSpecified()) {
      // It's a default member initializer.
      if (BitfieldSize.get())
        Diag(Tok, getLangOpts().CPlusPlus20
                      ? diag::warn_cxx17_compat_bitfield_member_init
                      : diag::ext_bitfield_member_init);
      HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
    } else {
      HasStaticInitializer = true;
    }
  }

  // NOTE: If Sema is the Action module and declarator is an instance field,
  // this call will *not* return the created decl; It will return null.
  // See Sema::ActOnCXXMemberDeclarator for details.

  NamedDecl *ThisDecl = nullptr;
  if (DS.isFriendSpecified()) {
    // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
    // to a friend declaration, that declaration shall be a definition.
    //
    // Diagnose attributes that appear in a friend member function declarator:
    //   friend int foo [[]] ();
    SmallVector<SourceRange, 4> Ranges;
    DeclaratorInfo.getCXX11AttributeRanges(Ranges);
    for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
         E = Ranges.end(); I != E; ++I)
      Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I;

    ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
                                               TemplateParams);
  } else {
    ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
                                                DeclaratorInfo,
                                                TemplateParams,
                                                BitfieldSize.get(),
                                                VS, HasInClassInit);

    if (VarTemplateDecl *VT =
            ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : nullptr)
      // Re-direct this decl to refer to the templated decl so that we can
      // initialize it.
      ThisDecl = VT->getTemplatedDecl();

    if (ThisDecl)
      Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs);
  }

  // Error recovery might have converted a non-static member into a static
  // member.
  if (HasInClassInit != ICIS_NoInit &&
      DeclaratorInfo.getDeclSpec().getStorageClassSpec() ==
          DeclSpec::SCS_static) {
    HasInClassInit = ICIS_NoInit;
    HasStaticInitializer = true;
  }

  if (PureSpecLoc.isValid() && VS.getAbstractLoc().isValid()) {
    Diag(PureSpecLoc, diag::err_duplicate_virt_specifier) << "abstract";
  }
  if (ThisDecl && PureSpecLoc.isValid())
    Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc);
  else if (ThisDecl && VS.getAbstractLoc().isValid())
    Actions.ActOnPureSpecifier(ThisDecl, VS.getAbstractLoc());

  // Handle the initializer.
  if (HasInClassInit != ICIS_NoInit) {
    // The initializer was deferred; parse it and cache the tokens.
    Diag(Tok, getLangOpts().CPlusPlus11
                  ? diag::warn_cxx98_compat_nonstatic_member_init
                  : diag::ext_nonstatic_member_init);

    if (DeclaratorInfo.isArrayOfUnknownBound()) {
      // C++11 [dcl.array]p3: An array bound may also be omitted when the
      // declarator is followed by an initializer.
      //
      // A brace-or-equal-initializer for a member-declarator is not an
      // initializer in the grammar, so this is ill-formed.
      Diag(Tok, diag::err_incomplete_array_member_init);
      SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);

      // Avoid later warnings about a class member of incomplete type.
      if (ThisDecl)
        ThisDecl->setInvalidDecl();
    } else
      ParseCXXNonStaticMemberInitializer(ThisDecl);
  } else if (HasStaticInitializer) {
    // Normal initializer.
    ExprResult Init = ParseCXXMemberInitializer(
        ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);

    if (Init.isInvalid()) {
      if (ThisDecl)
        Actions.ActOnUninitializedDecl(ThisDecl);
      SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
    } else if (ThisDecl)
      Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid());
  } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
    // No initializer.
    Actions.ActOnUninitializedDecl(ThisDecl);

  if (ThisDecl) {
    if (!ThisDecl->isInvalidDecl()) {
      // Set the Decl for any late parsed attributes
      for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
        CommonLateParsedAttrs[i]->addDecl(ThisDecl);

      for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
        LateParsedAttrs[i]->addDecl(ThisDecl);
    }
    Actions.FinalizeDeclaration(ThisDecl);
    DeclsInGroup.push_back(ThisDecl);

    if (DeclaratorInfo.isFunctionDeclarator() &&
        DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
            DeclSpec::SCS_typedef)
      HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
  }
  LateParsedAttrs.clear();

  DeclaratorInfo.complete(ThisDecl);

  // If we don't have a comma, it is either the end of the list (a ';')
  // or an error, bail out.
  SourceLocation CommaLoc;
  if (!TryConsumeToken(tok::comma, CommaLoc))
    break;

  if (Tok.isAtStartOfLine() &&
      !MightBeDeclarator(DeclaratorContext::Member)) {
    // This comma was followed by a line-break and something which can't be
    // the start of a declarator. The comma was probably a typo for a
    // semicolon.
    Diag(CommaLoc, diag::err_expected_semi_declaration)
      << FixItHint::CreateReplacement(CommaLoc, ";");
    ExpectSemi = false;
    break;
  }

  // Parse the next declarator.
  DeclaratorInfo.clear();
  VS.clear();
  BitfieldSize = ExprResult(/*Invalid=*/false);
  EqualLoc = PureSpecLoc = SourceLocation();
  DeclaratorInfo.setCommaLoc(CommaLoc);

  // GNU attributes are allowed before the second and subsequent declarator.
  // However, this does not apply for [[]] attributes (which could show up
  // before or after the __attribute__ attributes).
  DiagnoseAndSkipCXX11Attributes();
  MaybeParseGNUAttributes(DeclaratorInfo);
  DiagnoseAndSkipCXX11Attributes();

  if (ParseCXXMemberDeclaratorBeforeInitializer(
          DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs))
    break;
}

if (ExpectSemi &&
    ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
  // Skip to end of block or statement.
  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
  // If we stopped at a ';', eat it.
  TryConsumeToken(tok::semi);
  return nullptr;
}

return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
3088}

3090/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer.
3091/// Also detect and reject any attempted defaulted/deleted function definition.
3092/// The location of the '=', if any, will be placed in EqualLoc.
3093///
3094/// This does not check for a pure-specifier; that's handled elsewhere.
3095///
3096///   brace-or-equal-initializer:
3097///     '=' initializer-expression
3098///     braced-init-list
3099///
3100///   initializer-clause:
3101///     assignment-expression
3102///     braced-init-list
3103///
3104///   defaulted/deleted function-definition:
3105///     '=' 'default'
3106///     '=' 'delete'
3107///
3108/// Prior to C++0x, the assignment-expression in an initializer-clause must
3109/// be a constant-expression.
3110ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
                                           SourceLocation &EqualLoc) {
assert(Tok.isOneOf(tok::equal, tok::l_brace)(static_cast<void> (0))
       && "Data member initializer not starting with '=' or '{'")(static_cast<void> (0));

EnterExpressionEvaluationContext Context(
    Actions, Sema::ExpressionEvaluationContext::PotentiallyEvaluated, D);
if (TryConsumeToken(tok::equal, EqualLoc)) {
  if (Tok.is(tok::kw_delete)) {
    // In principle, an initializer of '= delete p;' is legal, but it will
    // never type-check. It's better to diagnose it as an ill-formed expression
    // than as an ill-formed deleted non-function member.
    // An initializer of '= delete p, foo' will never be parsed, because
    // a top-level comma always ends the initializer expression.
    const Token &Next = NextToken();
    if (IsFunction || Next.isOneOf(tok::semi, tok::comma, tok::eof)) {
      if (IsFunction)
        Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
          << 1 /* delete */;
      else
        Diag(ConsumeToken(), diag::err_deleted_non_function);
      return ExprError();
    }
  } else if (Tok.is(tok::kw_default)) {
    if (IsFunction)
      Diag(Tok, diag::err_default_delete_in_multiple_declaration)
        << 0 /* default */;
    else
      Diag(ConsumeToken(), diag::err_default_special_members)
          << getLangOpts().CPlusPlus20;
    return ExprError();
  }
}
if (const auto *PD = dyn_cast_or_null<MSPropertyDecl>(D)) {
  Diag(Tok, diag::err_ms_property_initializer) << PD;
  return ExprError();
}
return ParseInitializer();
3148}

3150void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc,
                                      SourceLocation AttrFixitLoc,
                                      unsigned TagType, Decl *TagDecl) {
// Skip the optional 'final' keyword.
if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
  assert(isCXX11FinalKeyword() && "not a class definition")(static_cast<void> (0));
  ConsumeToken();

  // Diagnose any C++11 attributes after 'final' keyword.
  // We deliberately discard these attributes.
  ParsedAttributesWithRange Attrs(AttrFactory);
  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);

  // This can only happen if we had malformed misplaced attributes;
  // we only get called if there is a colon or left-brace after the
  // attributes.
  if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace))
    return;
}

// Skip the base clauses. This requires actually parsing them, because
// otherwise we can't be sure where they end (a left brace may appear
// within a template argument).
if (Tok.is(tok::colon)) {
  // Enter the scope of the class so that we can correctly parse its bases.
  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
  ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true,
                                    TagType == DeclSpec::TST_interface);
  auto OldContext =
      Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl);

  // Parse the bases but don't attach them to the class.
  ParseBaseClause(nullptr);

  Actions.ActOnTagFinishSkippedDefinition(OldContext);

  if (!Tok.is(tok::l_brace)) {
    Diag(PP.getLocForEndOfToken(PrevTokLocation),
         diag::err_expected_lbrace_after_base_specifiers);
    return;
  }
}

// Skip the body.
assert(Tok.is(tok::l_brace))(static_cast<void> (0));
BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();
T.skipToEnd();

// Parse and discard any trailing attributes.
ParsedAttributes Attrs(AttrFactory);
if (Tok.is(tok::kw___attribute))
  MaybeParseGNUAttributes(Attrs);
3203}

3205Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas(
  AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs,
  DeclSpec::TST TagType, Decl *TagDecl) {
ParenBraceBracketBalancer BalancerRAIIObj(*this);

switch (Tok.getKind()) {
case tok::kw___if_exists:
case tok::kw___if_not_exists:
  ParseMicrosoftIfExistsClassDeclaration(TagType, AccessAttrs, AS);
  return nullptr;

case tok::semi:
  // Check for extraneous top-level semicolon.
  ConsumeExtraSemi(InsideStruct, TagType);
  return nullptr;

  // Handle pragmas that can appear as member declarations.
case tok::annot_pragma_vis:
  HandlePragmaVisibility();
  return nullptr;
case tok::annot_pragma_pack:
  HandlePragmaPack();
  return nullptr;
case tok::annot_pragma_align:
  HandlePragmaAlign();
  return nullptr;
case tok::annot_pragma_ms_pointers_to_members:
  HandlePragmaMSPointersToMembers();
  return nullptr;
case tok::annot_pragma_ms_pragma:
  HandlePragmaMSPragma();
  return nullptr;
case tok::annot_pragma_ms_vtordisp:
  HandlePragmaMSVtorDisp();
  return nullptr;
case tok::annot_pragma_dump:
  HandlePragmaDump();
  return nullptr;

case tok::kw_namespace:
  // If we see a namespace here, a close brace was missing somewhere.
  DiagnoseUnexpectedNamespace(cast<NamedDecl>(TagDecl));
  return nullptr;

case tok::kw_private:
  // FIXME: We don't accept GNU attributes on access specifiers in OpenCL mode
  // yet.
  if (getLangOpts().OpenCL && !NextToken().is(tok::colon))
    return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case tok::kw_public:
case tok::kw_protected: {
  AccessSpecifier NewAS = getAccessSpecifierIfPresent();
  assert(NewAS != AS_none)(static_cast<void> (0));
  // Current token is a C++ access specifier.
  AS = NewAS;
  SourceLocation ASLoc = Tok.getLocation();
  unsigned TokLength = Tok.getLength();
  ConsumeToken();
  AccessAttrs.clear();
  MaybeParseGNUAttributes(AccessAttrs);

  SourceLocation EndLoc;
  if (TryConsumeToken(tok::colon, EndLoc)) {
  } else if (TryConsumeToken(tok::semi, EndLoc)) {
    Diag(EndLoc, diag::err_expected)
        << tok::colon << FixItHint::CreateReplacement(EndLoc, ":");
  } else {
    EndLoc = ASLoc.getLocWithOffset(TokLength);
    Diag(EndLoc, diag::err_expected)
        << tok::colon << FixItHint::CreateInsertion(EndLoc, ":");
  }

  // The Microsoft extension __interface does not permit non-public
  // access specifiers.
  if (TagType == DeclSpec::TST_interface && AS != AS_public) {
    Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected);
  }

  if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc, AccessAttrs)) {
    // found another attribute than only annotations
    AccessAttrs.clear();
  }

  return nullptr;
}

case tok::annot_attr_openmp:
case tok::annot_pragma_openmp:
  return ParseOpenMPDeclarativeDirectiveWithExtDecl(
      AS, AccessAttrs, /*Delayed=*/true, TagType, TagDecl);

default:
  if (tok::isPragmaAnnotation(Tok.getKind())) {
    Diag(Tok.getLocation(), diag::err_pragma_misplaced_in_decl)
        << DeclSpec::getSpecifierName(TagType,
                                 Actions.getASTContext().getPrintingPolicy());
    ConsumeAnnotationToken();
    return nullptr;
  }
  return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
}
3307}

3309/// ParseCXXMemberSpecification - Parse the class definition.
3310///
3311///       member-specification:
3312///         member-declaration member-specification[opt]
3313///         access-specifier ':' member-specification[opt]
3314///
3315void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
                                       SourceLocation AttrFixitLoc,
                                       ParsedAttributesWithRange &Attrs,
                                       unsigned TagType, Decl *TagDecl) {
assert((TagType == DeclSpec::TST_struct ||(static_cast<void> (0))
       TagType == DeclSpec::TST_interface ||(static_cast<void> (0))
       TagType == DeclSpec::TST_union  ||(static_cast<void> (0))
       TagType == DeclSpec::TST_class) && "Invalid TagType!")(static_cast<void> (0));

llvm::TimeTraceScope TimeScope("ParseClass", [&]() {
  if (auto *TD = dyn_cast_or_null<NamedDecl>(TagDecl))
    return TD->getQualifiedNameAsString();
  return std::string("<anonymous>");
});

PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
                                    "parsing struct/union/class body");

// Determine whether this is a non-nested class. Note that local
// classes are *not* considered to be nested classes.
bool NonNestedClass = true;
if (!ClassStack.empty()) {
  for (const Scope *S = getCurScope(); S; S = S->getParent()) {
    if (S->isClassScope()) {
      // We're inside a class scope, so this is a nested class.
      NonNestedClass = false;

      // The Microsoft extension __interface does not permit nested classes.
      if (getCurrentClass().IsInterface) {
        Diag(RecordLoc, diag::err_invalid_member_in_interface)
          << /*ErrorType=*/6
          << (isa<NamedDecl>(TagDecl)
                ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
                : "(anonymous)");
      }
      break;
    }

    if ((S->getFlags() & Scope::FnScope))
      // If we're in a function or function template then this is a local
      // class rather than a nested class.
      break;
  }
}

// Enter a scope for the class.
ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);

// Note that we are parsing a new (potentially-nested) class definition.
ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
                                  TagType == DeclSpec::TST_interface);

if (TagDecl)
  Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);

SourceLocation FinalLoc;
SourceLocation AbstractLoc;
bool IsFinalSpelledSealed = false;
bool IsAbstract = false;

// Parse the optional 'final' keyword.
if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
  while (true) {
    VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok);
    if (Specifier == VirtSpecifiers::VS_None)
      break;
    if (isCXX11FinalKeyword()) {
      if (FinalLoc.isValid()) {
        auto Skipped = ConsumeToken();
        Diag(Skipped, diag::err_duplicate_class_virt_specifier)
            << VirtSpecifiers::getSpecifierName(Specifier);
      } else {
        FinalLoc = ConsumeToken();
        if (Specifier == VirtSpecifiers::VS_Sealed)
          IsFinalSpelledSealed = true;
      }
    } else {
      if (AbstractLoc.isValid()) {
        auto Skipped = ConsumeToken();
        Diag(Skipped, diag::err_duplicate_class_virt_specifier)
            << VirtSpecifiers::getSpecifierName(Specifier);
      } else {
        AbstractLoc = ConsumeToken();
        IsAbstract = true;
      }
    }
    if (TagType == DeclSpec::TST_interface)
      Diag(FinalLoc, diag::err_override_control_interface)
          << VirtSpecifiers::getSpecifierName(Specifier);
    else if (Specifier == VirtSpecifiers::VS_Final)
      Diag(FinalLoc, getLangOpts().CPlusPlus11
                         ? diag::warn_cxx98_compat_override_control_keyword
                         : diag::ext_override_control_keyword)
          << VirtSpecifiers::getSpecifierName(Specifier);
    else if (Specifier == VirtSpecifiers::VS_Sealed)
      Diag(FinalLoc, diag::ext_ms_sealed_keyword);
    else if (Specifier == VirtSpecifiers::VS_Abstract)
      Diag(AbstractLoc, diag::ext_ms_abstract_keyword);
    else if (Specifier == VirtSpecifiers::VS_GNU_Final)
      Diag(FinalLoc, diag::ext_warn_gnu_final);
  }
  assert((FinalLoc.isValid() || AbstractLoc.isValid()) &&(static_cast<void> (0))
         "not a class definition")(static_cast<void> (0));

  // Parse any C++11 attributes after 'final' keyword.
  // These attributes are not allowed to appear here,
  // and the only possible place for them to appertain
  // to the class would be between class-key and class-name.
  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);

  // ParseClassSpecifier() does only a superficial check for attributes before
  // deciding to call this method.  For example, for
  // `class C final alignas ([l) {` it will decide that this looks like a
  // misplaced attribute since it sees `alignas '(' ')'`.  But the actual
  // attribute parsing code will try to parse the '[' as a constexpr lambda
  // and consume enough tokens that the alignas parsing code will eat the
  // opening '{'.  So bail out if the next token isn't one we expect.
  if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) {
    if (TagDecl)
      Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
    return;
  }
}

if (Tok.is(tok::colon)) {
  ParseScope InheritanceScope(this, getCurScope()->getFlags() |
                                        Scope::ClassInheritanceScope);

  ParseBaseClause(TagDecl);
  if (!Tok.is(tok::l_brace)) {
    bool SuggestFixIt = false;
    SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation);
    if (Tok.isAtStartOfLine()) {
      switch (Tok.getKind()) {
      case tok::kw_private:
      case tok::kw_protected:
      case tok::kw_public:
        SuggestFixIt = NextToken().getKind() == tok::colon;
        break;
      case tok::kw_static_assert:
      case tok::r_brace:
      case tok::kw_using:
      // base-clause can have simple-template-id; 'template' can't be there
      case tok::kw_template:
        SuggestFixIt = true;
        break;
      case tok::identifier:
        SuggestFixIt = isConstructorDeclarator(true);
        break;
      default:
        SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false);
        break;
      }
    }
    DiagnosticBuilder LBraceDiag =
        Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers);
    if (SuggestFixIt) {
      LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {");
      // Try recovering from missing { after base-clause.
      PP.EnterToken(Tok, /*IsReinject*/true);
      Tok.setKind(tok::l_brace);
    } else {
      if (TagDecl)
        Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
      return;
    }
  }
}

assert(Tok.is(tok::l_brace))(static_cast<void> (0));
BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();

if (TagDecl)
  Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
                                          IsFinalSpelledSealed, IsAbstract,
                                          T.getOpenLocation());

// C++ 11p3: Members of a class defined with the keyword class are private
// by default. Members of a class defined with the keywords struct or union
// are public by default.
AccessSpecifier CurAS;
if (TagType == DeclSpec::TST_class)
  CurAS = AS_private;
else
  CurAS = AS_public;
ParsedAttributesWithRange AccessAttrs(AttrFactory);

if (TagDecl) {
  // While we still have something to read, read the member-declarations.
  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
         Tok.isNot(tok::eof)) {
    // Each iteration of this loop reads one member-declaration.
    ParseCXXClassMemberDeclarationWithPragmas(
        CurAS, AccessAttrs, static_cast<DeclSpec::TST>(TagType), TagDecl);
    MaybeDestroyTemplateIds();
  }
  T.consumeClose();
} else {
  SkipUntil(tok::r_brace);
}

// If attributes exist after class contents, parse them.
ParsedAttributes attrs(AttrFactory);
MaybeParseGNUAttributes(attrs);

if (TagDecl)
  Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
                                            T.getOpenLocation(),
                                            T.getCloseLocation(), attrs);

// C++11 [class.mem]p2:
//   Within the class member-specification, the class is regarded as complete
//   within function bodies, default arguments, exception-specifications, and
//   brace-or-equal-initializers for non-static data members (including such
//   things in nested classes).
if (TagDecl && NonNestedClass) {
  // We are not inside a nested class. This class and its nested classes
  // are complete and we can parse the delayed portions of method
  // declarations and the lexed inline method definitions, along with any
  // delayed attributes.

  SourceLocation SavedPrevTokLocation = PrevTokLocation;
  ParseLexedPragmas(getCurrentClass());
  ParseLexedAttributes(getCurrentClass());
  ParseLexedMethodDeclarations(getCurrentClass());

  // We've finished with all pending member declarations.
  Actions.ActOnFinishCXXMemberDecls();

  ParseLexedMemberInitializers(getCurrentClass());
  ParseLexedMethodDefs(getCurrentClass());
  PrevTokLocation = SavedPrevTokLocation;

  // We've finished parsing everything, including default argument
  // initializers.
  Actions.ActOnFinishCXXNonNestedClass();
}

if (TagDecl)
  Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());

// Leave the class scope.
ParsingDef.Pop();
ClassScope.Exit();
3560}

3562void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) {
assert(Tok.is(tok::kw_namespace))(static_cast<void> (0));

// FIXME: Suggest where the close brace should have gone by looking
// at indentation changes within the definition body.
Diag(D->getLocation(),
     diag::err_missing_end_of_definition) << D;
Diag(Tok.getLocation(),
     diag::note_missing_end_of_definition_before) << D;

// Push '};' onto the token stream to recover.
PP.EnterToken(Tok, /*IsReinject*/ true);

Tok.startToken();
Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation));
Tok.setKind(tok::semi);
PP.EnterToken(Tok, /*IsReinject*/ true);

Tok.setKind(tok::r_brace);
3581}

3583/// ParseConstructorInitializer - Parse a C++ constructor initializer,
3584/// which explicitly initializes the members or base classes of a
3585/// class (C++ [class.base.init]). For example, the three initializers
3586/// after the ':' in the Derived constructor below:
3587///
3588/// @code
3589/// class Base { };
3590/// class Derived : Base {
3591///   int x;
3592///   float f;
3593/// public:
3594///   Derived(float f) : Base(), x(17), f(f) { }
3595/// };
3596/// @endcode
3597///
3598/// [C++]  ctor-initializer:
3599///          ':' mem-initializer-list
3600///
3601/// [C++]  mem-initializer-list:
3602///          mem-initializer ...[opt]
3603///          mem-initializer ...[opt] , mem-initializer-list
3604void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
assert(Tok.is(tok::colon) &&(static_cast<void> (0))
       "Constructor initializer always starts with ':'")(static_cast<void> (0));

// Poison the SEH identifiers so they are flagged as illegal in constructor
// initializers.
PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
SourceLocation ColonLoc = ConsumeToken();

SmallVector<CXXCtorInitializer*, 4> MemInitializers;
bool AnyErrors = false;

do {
  if (Tok.is(tok::code_completion)) {
    cutOffParsing();
    Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
                                               MemInitializers);
    return;
  }

  MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
  if (!MemInit.isInvalid())
    MemInitializers.push_back(MemInit.get());
  else
    AnyErrors = true;

  if (Tok.is(tok::comma))
    ConsumeToken();
  else if (Tok.is(tok::l_brace))
    break;
  // If the previous initializer was valid and the next token looks like a
  // base or member initializer, assume that we're just missing a comma.
  else if (!MemInit.isInvalid() &&
           Tok.isOneOf(tok::identifier, tok::coloncolon)) {
    SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
    Diag(Loc, diag::err_ctor_init_missing_comma)
      << FixItHint::CreateInsertion(Loc, ", ");
  } else {
    // Skip over garbage, until we get to '{'.  Don't eat the '{'.
    if (!MemInit.isInvalid())
      Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace
                                                         << tok::comma;
    SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
    break;
  }
} while (true);

Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
                             AnyErrors);
3653}

3655/// ParseMemInitializer - Parse a C++ member initializer, which is
3656/// part of a constructor initializer that explicitly initializes one
3657/// member or base class (C++ [class.base.init]). See
3658/// ParseConstructorInitializer for an example.
3659///
3660/// [C++] mem-initializer:
3661///         mem-initializer-id '(' expression-list[opt] ')'
3662/// [C++0x] mem-initializer-id braced-init-list
3663///
3664/// [C++] mem-initializer-id:
3665///         '::'[opt] nested-name-specifier[opt] class-name
3666///         identifier
3667MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
// parse '::'[opt] nested-name-specifier[opt]
CXXScopeSpec SS;
if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
                                   /*ObjectHadErrors=*/false,
                                   /*EnteringContext=*/false))
  return true;

// : identifier
IdentifierInfo *II = nullptr;
SourceLocation IdLoc = Tok.getLocation();
// : declype(...)
DeclSpec DS(AttrFactory);
// : template_name<...>
TypeResult TemplateTypeTy;

if (Tok.is(tok::identifier)) {
  // Get the identifier. This may be a member name or a class name,
  // but we'll let the semantic analysis determine which it is.
  II = Tok.getIdentifierInfo();
  ConsumeToken();
} else if (Tok.is(tok::annot_decltype)) {
  // Get the decltype expression, if there is one.
  // Uses of decltype will already have been converted to annot_decltype by
  // ParseOptionalCXXScopeSpecifier at this point.
  // FIXME: Can we get here with a scope specifier?
  ParseDecltypeSpecifier(DS);
} else {
  TemplateIdAnnotation *TemplateId = Tok.is(tok::annot_template_id)
                                         ? takeTemplateIdAnnotation(Tok)
                                         : nullptr;
  if (TemplateId && TemplateId->mightBeType()) {
    AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true);
    assert(Tok.is(tok::annot_typename) && "template-id -> type failed")(static_cast<void> (0));
    TemplateTypeTy = getTypeAnnotation(Tok);
    ConsumeAnnotationToken();
  } else {
    Diag(Tok, diag::err_expected_member_or_base_name);
    return true;
  }
}

// Parse the '('.
if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
  Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);

  // FIXME: Add support for signature help inside initializer lists.
  ExprResult InitList = ParseBraceInitializer();
  if (InitList.isInvalid())
    return true;

  SourceLocation EllipsisLoc;
  TryConsumeToken(tok::ellipsis, EllipsisLoc);

  if (TemplateTypeTy.isInvalid())
    return true;
  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
                                     TemplateTypeTy.get(), DS, IdLoc,
                                     InitList.get(), EllipsisLoc);
} else if(Tok.is(tok::l_paren)) {
  BalancedDelimiterTracker T(*this, tok::l_paren);
  T.consumeOpen();

  // Parse the optional expression-list.
  ExprVector ArgExprs;
  CommaLocsTy CommaLocs;
  auto RunSignatureHelp = [&] {
    if (TemplateTypeTy.isInvalid())
      return QualType();
    QualType PreferredType = Actions.ProduceCtorInitMemberSignatureHelp(
        getCurScope(), ConstructorDecl, SS, TemplateTypeTy.get(), ArgExprs, II,
        T.getOpenLocation());
    CalledSignatureHelp = true;
    return PreferredType;
  };
  if (Tok.isNot(tok::r_paren) &&
      ParseExpressionList(ArgExprs, CommaLocs, [&] {
        PreferredType.enterFunctionArgument(Tok.getLocation(),
                                            RunSignatureHelp);
      })) {
    if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
      RunSignatureHelp();
    SkipUntil(tok::r_paren, StopAtSemi);
    return true;
  }

  T.consumeClose();

  SourceLocation EllipsisLoc;
  TryConsumeToken(tok::ellipsis, EllipsisLoc);

  if (TemplateTypeTy.isInvalid())
    return true;
  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
                                     TemplateTypeTy.get(), DS, IdLoc,
                                     T.getOpenLocation(), ArgExprs,
                                     T.getCloseLocation(), EllipsisLoc);
}

if (TemplateTypeTy.isInvalid())
  return true;

if (getLangOpts().CPlusPlus11)
  return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace;
else
  return Diag(Tok, diag::err_expected) << tok::l_paren;
3773}

3775/// Parse a C++ exception-specification if present (C++0x [except.spec]).
3776///
3777///       exception-specification:
3778///         dynamic-exception-specification
3779///         noexcept-specification
3780///
3781///       noexcept-specification:
3782///         'noexcept'
3783///         'noexcept' '(' constant-expression ')'
3784ExceptionSpecificationType
3785Parser::tryParseExceptionSpecification(bool Delayed,
                  SourceRange &SpecificationRange,
                  SmallVectorImpl<ParsedType> &DynamicExceptions,
                  SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
                  ExprResult &NoexceptExpr,
                  CachedTokens *&ExceptionSpecTokens) {
ExceptionSpecificationType Result = EST_None;
ExceptionSpecTokens = nullptr;

// Handle delayed parsing of exception-specifications.
if (Delayed) {
  if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
    return EST_None;

  // Consume and cache the starting token.
  bool IsNoexcept = Tok.is(tok::kw_noexcept);
  Token StartTok = Tok;
  SpecificationRange = SourceRange(ConsumeToken());

  // Check for a '('.
  if (!Tok.is(tok::l_paren)) {
    // If this is a bare 'noexcept', we're done.
    if (IsNoexcept) {
      Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
      NoexceptExpr = nullptr;
      return EST_BasicNoexcept;
    }

    Diag(Tok, diag::err_expected_lparen_after) << "throw";
    return EST_DynamicNone;
  }

  // Cache the tokens for the exception-specification.
  ExceptionSpecTokens = new CachedTokens;
  ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
  ExceptionSpecTokens->push_back(Tok); // '('
  SpecificationRange.setEnd(ConsumeParen()); // '('

  ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
                       /*StopAtSemi=*/true,
                       /*ConsumeFinalToken=*/true);
  SpecificationRange.setEnd(ExceptionSpecTokens->back().getLocation());

  return EST_Unparsed;
}

// See if there's a dynamic specification.
if (Tok.is(tok::kw_throw)) {
  Result = ParseDynamicExceptionSpecification(SpecificationRange,
                                              DynamicExceptions,
                                              DynamicExceptionRanges);
  assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&(static_cast<void> (0))
         "Produced different number of exception types and ranges.")(static_cast<void> (0));
}

// If there's no noexcept specification, we're done.
if (Tok.isNot(tok::kw_noexcept))
  return Result;

Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);

// If we already had a dynamic specification, parse the noexcept for,
// recovery, but emit a diagnostic and don't store the results.
SourceRange NoexceptRange;
ExceptionSpecificationType NoexceptType = EST_None;

SourceLocation KeywordLoc = ConsumeToken();
if (Tok.is(tok::l_paren)) {
  // There is an argument.
  BalancedDelimiterTracker T(*this, tok::l_paren);
  T.consumeOpen();
  NoexceptExpr = ParseConstantExpression();
  T.consumeClose();
  if (!NoexceptExpr.isInvalid()) {
    NoexceptExpr = Actions.ActOnNoexceptSpec(NoexceptExpr.get(),
                                             NoexceptType);
    NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
  } else {
    NoexceptType = EST_BasicNoexcept;
  }
} else {
  // There is no argument.
  NoexceptType = EST_BasicNoexcept;
  NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
}

if (Result == EST_None) {
  SpecificationRange = NoexceptRange;
  Result = NoexceptType;

  // If there's a dynamic specification after a noexcept specification,
  // parse that and ignore the results.
  if (Tok.is(tok::kw_throw)) {
    Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
    ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
                                       DynamicExceptionRanges);
  }
} else {
  Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
}

return Result;
3887}

3889static void diagnoseDynamicExceptionSpecification(
  Parser &P, SourceRange Range, bool IsNoexcept) {
if (P.getLangOpts().CPlusPlus11) {
  const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
  P.Diag(Range.getBegin(),
         P.getLangOpts().CPlusPlus17 && !IsNoexcept
             ? diag::ext_dynamic_exception_spec
             : diag::warn_exception_spec_deprecated)
      << Range;
  P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
    << Replacement << FixItHint::CreateReplacement(Range, Replacement);
}
3901}

3903/// ParseDynamicExceptionSpecification - Parse a C++
3904/// dynamic-exception-specification (C++ [except.spec]).
3905///
3906///       dynamic-exception-specification:
3907///         'throw' '(' type-id-list [opt] ')'
3908/// [MS]    'throw' '(' '...' ')'
3909///
3910///       type-id-list:
3911///         type-id ... [opt]
3912///         type-id-list ',' type-id ... [opt]
3913///
3914ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
                                SourceRange &SpecificationRange,
                                SmallVectorImpl<ParsedType> &Exceptions,
                                SmallVectorImpl<SourceRange> &Ranges) {
assert(Tok.is(tok::kw_throw) && "expected throw")(static_cast<void> (0));

SpecificationRange.setBegin(ConsumeToken());
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
  Diag(Tok, diag::err_expected_lparen_after) << "throw";
  SpecificationRange.setEnd(SpecificationRange.getBegin());
  return EST_DynamicNone;
}

// Parse throw(...), a Microsoft extension that means "this function
// can throw anything".
if (Tok.is(tok::ellipsis)) {
  SourceLocation EllipsisLoc = ConsumeToken();
  if (!getLangOpts().MicrosoftExt)
    Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
  T.consumeClose();
  SpecificationRange.setEnd(T.getCloseLocation());
  diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
  return EST_MSAny;
}

// Parse the sequence of type-ids.
SourceRange Range;
while (Tok.isNot(tok::r_paren)) {
  TypeResult Res(ParseTypeName(&Range));

  if (Tok.is(tok::ellipsis)) {
    // C++0x [temp.variadic]p5:
    //   - In a dynamic-exception-specification (15.4); the pattern is a
    //     type-id.
    SourceLocation Ellipsis = ConsumeToken();
    Range.setEnd(Ellipsis);
    if (!Res.isInvalid())
      Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
  }

  if (!Res.isInvalid()) {
    Exceptions.push_back(Res.get());
    Ranges.push_back(Range);
  }

  if (!TryConsumeToken(tok::comma))
    break;
}

T.consumeClose();
SpecificationRange.setEnd(T.getCloseLocation());
diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
                                      Exceptions.empty());
return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3969}

3971/// ParseTrailingReturnType - Parse a trailing return type on a new-style
3972/// function declaration.
3973TypeResult Parser::ParseTrailingReturnType(SourceRange &Range,
                                         bool MayBeFollowedByDirectInit) {
assert(Tok.is(tok::arrow) && "expected arrow")(static_cast<void> (0));

ConsumeToken();

return ParseTypeName(&Range, MayBeFollowedByDirectInit
                                 ? DeclaratorContext::TrailingReturnVar
                                 : DeclaratorContext::TrailingReturn);
3982}

3984/// Parse a requires-clause as part of a function declaration.
3985void Parser::ParseTrailingRequiresClause(Declarator &D) {
assert(Tok.is(tok::kw_requires) && "expected requires")(static_cast<void> (0));

SourceLocation RequiresKWLoc = ConsumeToken();

ExprResult TrailingRequiresClause;
ParseScope ParamScope(this,
                      Scope::DeclScope |
                      Scope::FunctionDeclarationScope |
                      Scope::FunctionPrototypeScope);

Actions.ActOnStartTrailingRequiresClause(getCurScope(), D);

llvm::Optional<Sema::CXXThisScopeRAII> ThisScope;
InitCXXThisScopeForDeclaratorIfRelevant(D, D.getDeclSpec(), ThisScope);

TrailingRequiresClause =
    ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true);

TrailingRequiresClause =
    Actions.ActOnFinishTrailingRequiresClause(TrailingRequiresClause);

if (!D.isDeclarationOfFunction()) {
  Diag(RequiresKWLoc,
       diag::err_requires_clause_on_declarator_not_declaring_a_function);
  return;
}

if (TrailingRequiresClause.isInvalid())
  SkipUntil({tok::l_brace, tok::arrow, tok::kw_try, tok::comma, tok::colon},
            StopAtSemi | StopBeforeMatch);
else
  D.setTrailingRequiresClause(TrailingRequiresClause.get());

// Did the user swap the trailing return type and requires clause?
if (D.isFunctionDeclarator() && Tok.is(tok::arrow) &&
    D.getDeclSpec().getTypeSpecType() == TST_auto) {
  SourceLocation ArrowLoc = Tok.getLocation();
  SourceRange Range;
  TypeResult TrailingReturnType =
      ParseTrailingReturnType(Range, /*MayBeFollowedByDirectInit=*/false);

  if (!TrailingReturnType.isInvalid()) {
    Diag(ArrowLoc,
         diag::err_requires_clause_must_appear_after_trailing_return)
        << Range;
    auto &FunctionChunk = D.getFunctionTypeInfo();
    FunctionChunk.HasTrailingReturnType = TrailingReturnType.isUsable();
    FunctionChunk.TrailingReturnType = TrailingReturnType.get();
    FunctionChunk.TrailingReturnTypeLoc = Range.getBegin();
  } else
    SkipUntil({tok::equal, tok::l_brace, tok::arrow, tok::kw_try, tok::comma},
              StopAtSemi | StopBeforeMatch);
}
4039}

4041/// We have just started parsing the definition of a new class,
4042/// so push that class onto our stack of classes that is currently
4043/// being parsed.
4044Sema::ParsingClassState
4045Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
                       bool IsInterface) {
assert((NonNestedClass || !ClassStack.empty()) &&(static_cast<void> (0))
       "Nested class without outer class")(static_cast<void> (0));
ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
return Actions.PushParsingClass();
4051}

4053/// Deallocate the given parsed class and all of its nested
4054/// classes.
4055void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
  delete Class->LateParsedDeclarations[I];
delete Class;
4059}

4061/// Pop the top class of the stack of classes that are
4062/// currently being parsed.
4063///
4064/// This routine should be called when we have finished parsing the
4065/// definition of a class, but have not yet popped the Scope
4066/// associated with the class's definition.
4067void Parser::PopParsingClass(Sema::ParsingClassState state) {
assert(!ClassStack.empty() && "Mismatched push/pop for class parsing")(static_cast<void> (0));

Actions.PopParsingClass(state);

ParsingClass *Victim = ClassStack.top();
ClassStack.pop();
if (Victim->TopLevelClass) {
  // Deallocate all of the nested classes of this class,
  // recursively: we don't need to keep any of this information.
  DeallocateParsedClasses(Victim);
  return;
}
assert(!ClassStack.empty() && "Missing top-level class?")(static_cast<void> (0));

if (Victim->LateParsedDeclarations.empty()) {
  // The victim is a nested class, but we will not need to perform
  // any processing after the definition of this class since it has
  // no members whose handling was delayed. Therefore, we can just
  // remove this nested class.
  DeallocateParsedClasses(Victim);
  return;
}

// This nested class has some members that will need to be processed
// after the top-level class is completely defined. Therefore, add
// it to the list of nested classes within its parent.
assert(getCurScope()->isClassScope() && "Nested class outside of class scope?")(static_cast<void> (0));
ClassStack.top()->LateParsedDeclarations.push_back(
    new LateParsedClass(this, Victim));
4097}

4099/// Try to parse an 'identifier' which appears within an attribute-token.
4100///
4101/// \return the parsed identifier on success, and 0 if the next token is not an
4102/// attribute-token.
4103///
4104/// C++11 [dcl.attr.grammar]p3:
4105///   If a keyword or an alternative token that satisfies the syntactic
4106///   requirements of an identifier is contained in an attribute-token,
4107///   it is considered an identifier.
4108IdentifierInfo *
4109Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc,
                                       Sema::AttributeCompletion Completion,
                                       const IdentifierInfo *Scope) {
switch (Tok.getKind()) {
default:
  // Identifiers and keywords have identifier info attached.
  if (!Tok.isAnnotation()) {
    if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
      Loc = ConsumeToken();
      return II;
    }
  }
  return nullptr;

case tok::code_completion:
  cutOffParsing();
  Actions.CodeCompleteAttribute(getLangOpts().CPlusPlus ? ParsedAttr::AS_CXX11
                                                        : ParsedAttr::AS_C2x,
                                Completion, Scope);
  return nullptr;

case tok::numeric_constant: {
  // If we got a numeric constant, check to see if it comes from a macro that
  // corresponds to the predefined __clang__ macro. If it does, warn the user
  // and recover by pretending they said _Clang instead.
  if (Tok.getLocation().isMacroID()) {
    SmallString<8> ExpansionBuf;
    SourceLocation ExpansionLoc =
        PP.getSourceManager().getExpansionLoc(Tok.getLocation());
    StringRef Spelling = PP.getSpelling(ExpansionLoc, ExpansionBuf);
    if (Spelling == "__clang__") {
      SourceRange TokRange(
          ExpansionLoc,
          PP.getSourceManager().getExpansionLoc(Tok.getEndLoc()));
      Diag(Tok, diag::warn_wrong_clang_attr_namespace)
          << FixItHint::CreateReplacement(TokRange, "_Clang");
      Loc = ConsumeToken();
      return &PP.getIdentifierTable().get("_Clang");
    }
  }
  return nullptr;
}

case tok::ampamp:       // 'and'
case tok::pipe:         // 'bitor'
case tok::pipepipe:     // 'or'
case tok::caret:        // 'xor'
case tok::tilde:        // 'compl'
case tok::amp:          // 'bitand'
case tok::ampequal:     // 'and_eq'
case tok::pipeequal:    // 'or_eq'
case tok::caretequal:   // 'xor_eq'
case tok::exclaim:      // 'not'
case tok::exclaimequal: // 'not_eq'
  // Alternative tokens do not have identifier info, but their spelling
  // starts with an alphabetical character.
  SmallString<8> SpellingBuf;
  SourceLocation SpellingLoc =
      PP.getSourceManager().getSpellingLoc(Tok.getLocation());
  StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf);
  if (isLetter(Spelling[0])) {
    Loc = ConsumeToken();
    return &PP.getIdentifierTable().get(Spelling);
  }
  return nullptr;
}
4175}

4177void Parser::ParseOpenMPAttributeArgs(IdentifierInfo *AttrName,
                                    CachedTokens &OpenMPTokens) {
// Both 'sequence' and 'directive' attributes require arguments, so parse the
// open paren for the argument list.
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
  Diag(Tok, diag::err_expected) << tok::l_paren;
  return;
}

if (AttrName->isStr("directive")) {
  // If the attribute is named `directive`, we can consume its argument list
  // and push the tokens from it into the cached token stream for a new OpenMP
  // pragma directive.
  Token OMPBeginTok;
  OMPBeginTok.startToken();
  OMPBeginTok.setKind(tok::annot_attr_openmp);
  OMPBeginTok.setLocation(Tok.getLocation());
  OpenMPTokens.push_back(OMPBeginTok);

  ConsumeAndStoreUntil(tok::r_paren, OpenMPTokens, /*StopAtSemi=*/false,
                       /*ConsumeFinalToken*/ false);
  Token OMPEndTok;
  OMPEndTok.startToken();
  OMPEndTok.setKind(tok::annot_pragma_openmp_end);
  OMPEndTok.setLocation(Tok.getLocation());
  OpenMPTokens.push_back(OMPEndTok);
} else {
  assert(AttrName->isStr("sequence") &&(static_cast<void> (0))
         "Expected either 'directive' or 'sequence'")(static_cast<void> (0));
  // If the attribute is named 'sequence', its argument is a list of one or
  // more OpenMP attributes (either 'omp::directive' or 'omp::sequence',
  // where the 'omp::' is optional).
  do {
    // We expect to see one of the following:
    //  * An identifier (omp) for the attribute namespace followed by ::
    //  * An identifier (directive) or an identifier (sequence).
    SourceLocation IdentLoc;
    IdentifierInfo *Ident = TryParseCXX11AttributeIdentifier(IdentLoc);

    // If there is an identifier and it is 'omp', a double colon is required
    // followed by the actual identifier we're after.
    if (Ident && Ident->isStr("omp") && !ExpectAndConsume(tok::coloncolon))
      Ident = TryParseCXX11AttributeIdentifier(IdentLoc);

    // If we failed to find an identifier (scoped or otherwise), or we found
    // an unexpected identifier, diagnose.
    if (!Ident || (!Ident->isStr("directive") && !Ident->isStr("sequence"))) {
      Diag(Tok.getLocation(), diag::err_expected_sequence_or_directive);
      SkipUntil(tok::r_paren, StopBeforeMatch);
      continue;
    }
    // We read an identifier. If the identifier is one of the ones we
    // expected, we can recurse to parse the args.
    ParseOpenMPAttributeArgs(Ident, OpenMPTokens);

    // There may be a comma to signal that we expect another directive in the
    // sequence.
  } while (TryConsumeToken(tok::comma));
}
// Parse the closing paren for the argument list.
T.consumeClose();
4239}

4241static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
                                            IdentifierInfo *ScopeName) {
switch (
    ParsedAttr::getParsedKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) {
case ParsedAttr::AT_CarriesDependency:
case ParsedAttr::AT_Deprecated:
case ParsedAttr::AT_FallThrough:
case ParsedAttr::AT_CXX11NoReturn:
case ParsedAttr::AT_NoUniqueAddress:
case ParsedAttr::AT_Likely:
case ParsedAttr::AT_Unlikely:
  return true;
case ParsedAttr::AT_WarnUnusedResult:
  return !ScopeName && AttrName->getName().equals("nodiscard");
case ParsedAttr::AT_Unused:
  return !ScopeName && AttrName->getName().equals("maybe_unused");
default:
  return false;
}
4260}

4262/// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause.
4263///
4264/// [C++11] attribute-argument-clause:
4265///         '(' balanced-token-seq ')'
4266///
4267/// [C++11] balanced-token-seq:
4268///         balanced-token
4269///         balanced-token-seq balanced-token
4270///
4271/// [C++11] balanced-token:
4272///         '(' balanced-token-seq ')'
4273///         '[' balanced-token-seq ']'
4274///         '{' balanced-token-seq '}'
4275///         any token but '(', ')', '[', ']', '{', or '}'
4276bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName,
                                   SourceLocation AttrNameLoc,
                                   ParsedAttributes &Attrs,
                                   SourceLocation *EndLoc,
                                   IdentifierInfo *ScopeName,
                                   SourceLocation ScopeLoc,
                                   CachedTokens &OpenMPTokens) {
assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list")(static_cast<void> (0));
SourceLocation LParenLoc = Tok.getLocation();
const LangOptions &LO = getLangOpts();
ParsedAttr::Syntax Syntax =
    LO.CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x;

// If the attribute isn't known, we will not attempt to parse any
// arguments.
if (!hasAttribute(LO.CPlusPlus ? AttrSyntax::CXX : AttrSyntax::C, ScopeName,
                  AttrName, getTargetInfo(), getLangOpts())) {
  // Eat the left paren, then skip to the ending right paren.
  ConsumeParen();
  SkipUntil(tok::r_paren);
  return false;
}

if (ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"))) {
  // GNU-scoped attributes have some special cases to handle GNU-specific
  // behaviors.
  ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
                        ScopeLoc, Syntax, nullptr);
  return true;
}

if (ScopeName && ScopeName->isStr("omp")) {
  Diag(AttrNameLoc, getLangOpts().OpenMP >= 51
                        ? diag::warn_omp51_compat_attributes
                                  : diag::ext_omp_attributes);

  ParseOpenMPAttributeArgs(AttrName, OpenMPTokens);

  // We claim that an attribute was parsed and added so that one is not
  // created for us by the caller.
  return true;
}

unsigned NumArgs;
// Some Clang-scoped attributes have some special parsing behavior.
if (ScopeName && (ScopeName->isStr("clang") || ScopeName->isStr("_Clang")))
  NumArgs = ParseClangAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc,
                                    ScopeName, ScopeLoc, Syntax);
else
  NumArgs =
      ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
                               ScopeName, ScopeLoc, Syntax);

if (!Attrs.empty() &&
    IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) {
  ParsedAttr &Attr = Attrs.back();
  // If the attribute is a standard or built-in attribute and we are
  // parsing an argument list, we need to determine whether this attribute
  // was allowed to have an argument list (such as [[deprecated]]), and how
  // many arguments were parsed (so we can diagnose on [[deprecated()]]).
  if (Attr.getMaxArgs() && !NumArgs) {
    // The attribute was allowed to have arguments, but none were provided
    // even though the attribute parsed successfully. This is an error.
    Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName;
    Attr.setInvalid(true);
  } else if (!Attr.getMaxArgs()) {
    // The attribute parsed successfully, but was not allowed to have any
    // arguments. It doesn't matter whether any were provided -- the
    // presence of the argument list (even if empty) is diagnosed.
    Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments)
        << AttrName
        << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc));
    Attr.setInvalid(true);
  }
}
return true;
4352}

4354/// ParseCXX11AttributeSpecifier - Parse a C++11 or C2x attribute-specifier.
4355///
4356/// [C++11] attribute-specifier:
4357///         '[' '[' attribute-list ']' ']'
4358///         alignment-specifier
4359///
4360/// [C++11] attribute-list:
4361///         attribute[opt]
4362///         attribute-list ',' attribute[opt]
4363///         attribute '...'
4364///         attribute-list ',' attribute '...'
4365///
4366/// [C++11] attribute:
4367///         attribute-token attribute-argument-clause[opt]
4368///
4369/// [C++11] attribute-token:
4370///         identifier
4371///         attribute-scoped-token
4372///
4373/// [C++11] attribute-scoped-token:
4374///         attribute-namespace '::' identifier
4375///
4376/// [C++11] attribute-namespace:
4377///         identifier
4378void Parser::ParseCXX11AttributeSpecifierInternal(ParsedAttributes &Attrs,
                                                CachedTokens &OpenMPTokens,
                                                SourceLocation *EndLoc) {
if (Tok.is(tok::kw_alignas)) {
  Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
  ParseAlignmentSpecifier(Attrs, EndLoc);
  return;
}

assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) &&(static_cast<void> (0))
       "Not a double square bracket attribute list")(static_cast<void> (0));

SourceLocation OpenLoc = Tok.getLocation();
Diag(OpenLoc, diag::warn_cxx98_compat_attribute);

ConsumeBracket();
checkCompoundToken(OpenLoc, tok::l_square, CompoundToken::AttrBegin);
ConsumeBracket();

SourceLocation CommonScopeLoc;
IdentifierInfo *CommonScopeName = nullptr;
if (Tok.is(tok::kw_using)) {
  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
                              ? diag::warn_cxx14_compat_using_attribute_ns
                              : diag::ext_using_attribute_ns);
  ConsumeToken();

  CommonScopeName = TryParseCXX11AttributeIdentifier(
      CommonScopeLoc, Sema::AttributeCompletion::Scope);
  if (!CommonScopeName) {
    Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
    SkipUntil(tok::r_square, tok::colon, StopBeforeMatch);
  }
  if (!TryConsumeToken(tok::colon) && CommonScopeName)
    Diag(Tok.getLocation(), diag::err_expected) << tok::colon;
}

llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;

bool AttrParsed = false;
while (!Tok.isOneOf(tok::r_square, tok::semi, tok::eof)) {
  if (AttrParsed) {
    // If we parsed an attribute, a comma is required before parsing any
    // additional attributes.
    if (ExpectAndConsume(tok::comma)) {
      SkipUntil(tok::r_square, StopAtSemi | StopBeforeMatch);
      continue;
    }
    AttrParsed = false;
  }

  // Eat all remaining superfluous commas before parsing the next attribute.
  while (TryConsumeToken(tok::comma))
    ;

  SourceLocation ScopeLoc, AttrLoc;
  IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr;

  AttrName = TryParseCXX11AttributeIdentifier(
      AttrLoc, Sema::AttributeCompletion::Attribute, CommonScopeName);
  if (!AttrName)
    // Break out to the "expected ']'" diagnostic.
    break;

  // scoped attribute
  if (TryConsumeToken(tok::coloncolon)) {
    ScopeName = AttrName;
    ScopeLoc = AttrLoc;

    AttrName = TryParseCXX11AttributeIdentifier(
        AttrLoc, Sema::AttributeCompletion::Attribute, ScopeName);
    if (!AttrName) {
      Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
      SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch);
      continue;
    }
  }

  if (CommonScopeName) {
    if (ScopeName) {
      Diag(ScopeLoc, diag::err_using_attribute_ns_conflict)
          << SourceRange(CommonScopeLoc);
    } else {
      ScopeName = CommonScopeName;
      ScopeLoc = CommonScopeLoc;
    }
  }

  // Parse attribute arguments
  if (Tok.is(tok::l_paren))
    AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, Attrs, EndLoc,
                                         ScopeName, ScopeLoc, OpenMPTokens);

  if (!AttrParsed) {
    Attrs.addNew(
        AttrName,
        SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, AttrLoc),
        ScopeName, ScopeLoc, nullptr, 0,
        getLangOpts().CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x);
    AttrParsed = true;
  }

  if (TryConsumeToken(tok::ellipsis))
    Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
      << AttrName;
}

// If we hit an error and recovered by parsing up to a semicolon, eat the
// semicolon and don't issue further diagnostics about missing brackets.
if (Tok.is(tok::semi)) {
  ConsumeToken();
  return;
}

SourceLocation CloseLoc = Tok.getLocation();
if (ExpectAndConsume(tok::r_square))
  SkipUntil(tok::r_square);
else if (Tok.is(tok::r_square))
  checkCompoundToken(CloseLoc, tok::r_square, CompoundToken::AttrEnd);
if (EndLoc)
  *EndLoc = Tok.getLocation();
if (ExpectAndConsume(tok::r_square))
  SkipUntil(tok::r_square);
4501}

4503/// ParseCXX11Attributes - Parse a C++11 or C2x attribute-specifier-seq.
4504///
4505/// attribute-specifier-seq:
4506///       attribute-specifier-seq[opt] attribute-specifier
4507void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
                                SourceLocation *endLoc) {
assert(standardAttributesAllowed())(static_cast<void> (0));

SourceLocation StartLoc = Tok.getLocation(), Loc;
if (!endLoc)
  endLoc = &Loc;

do {
  ParseCXX11AttributeSpecifier(attrs, endLoc);
} while (isCXX11AttributeSpecifier());

attrs.Range = SourceRange(StartLoc, *endLoc);
4520}

4522void Parser::DiagnoseAndSkipCXX11Attributes() {
// Start and end location of an attribute or an attribute list.
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc = SkipCXX11Attributes();

if (EndLoc.isValid()) {
  SourceRange Range(StartLoc, EndLoc);
  Diag(StartLoc, diag::err_attributes_not_allowed)
    << Range;
}
4532}

4534SourceLocation Parser::SkipCXX11Attributes() {
SourceLocation EndLoc;

if (!isCXX11AttributeSpecifier())
  return EndLoc;

do {
  if (Tok.is(tok::l_square)) {
    BalancedDelimiterTracker T(*this, tok::l_square);
    T.consumeOpen();
    T.skipToEnd();
    EndLoc = T.getCloseLocation();
  } else {
    assert(Tok.is(tok::kw_alignas) && "not an attribute specifier")(static_cast<void> (0));
    ConsumeToken();
    BalancedDelimiterTracker T(*this, tok::l_paren);
    if (!T.consumeOpen())
      T.skipToEnd();
    EndLoc = T.getCloseLocation();
  }
} while (isCXX11AttributeSpecifier());

return EndLoc;
4557}

4559/// Parse uuid() attribute when it appears in a [] Microsoft attribute.
4560void Parser::ParseMicrosoftUuidAttributeArgs(ParsedAttributes &Attrs) {
assert(Tok.is(tok::identifier) && "Not a Microsoft attribute list")(static_cast<void> (0));
IdentifierInfo *UuidIdent = Tok.getIdentifierInfo();
assert(UuidIdent->getName() == "uuid" && "Not a Microsoft attribute list")(static_cast<void> (0));

SourceLocation UuidLoc = Tok.getLocation();
ConsumeToken();

// Ignore the left paren location for now.
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
  Diag(Tok, diag::err_expected) << tok::l_paren;
  return;
}

ArgsVector ArgExprs;
if (Tok.is(tok::string_literal)) {
  // Easy case: uuid("...") -- quoted string.
  ExprResult StringResult = ParseStringLiteralExpression();
  if (StringResult.isInvalid())
    return;
  ArgExprs.push_back(StringResult.get());
} else {
  // something like uuid({000000A0-0000-0000-C000-000000000049}) -- no
  // quotes in the parens. Just append the spelling of all tokens encountered
  // until the closing paren.

  SmallString<42> StrBuffer; // 2 "", 36 bytes UUID, 2 optional {}, 1 nul
  StrBuffer += "\"";

  // Since none of C++'s keywords match [a-f]+, accepting just tok::l_brace,
  // tok::r_brace, tok::minus, tok::identifier (think C000) and
  // tok::numeric_constant (0000) should be enough. But the spelling of the
  // uuid argument is checked later anyways, so there's no harm in accepting
  // almost anything here.
  // cl is very strict about whitespace in this form and errors out if any
  // is present, so check the space flags on the tokens.
  SourceLocation StartLoc = Tok.getLocation();
  while (Tok.isNot(tok::r_paren)) {
    if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
      Diag(Tok, diag::err_attribute_uuid_malformed_guid);
      SkipUntil(tok::r_paren, StopAtSemi);
      return;
    }
    SmallString<16> SpellingBuffer;
    SpellingBuffer.resize(Tok.getLength() + 1);
    bool Invalid = false;
    StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
    if (Invalid) {
      SkipUntil(tok::r_paren, StopAtSemi);
      return;
    }
    StrBuffer += TokSpelling;
    ConsumeAnyToken();
  }
  StrBuffer += "\"";

  if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
    Diag(Tok, diag::err_attribute_uuid_malformed_guid);
    ConsumeParen();
    return;
  }

  // Pretend the user wrote the appropriate string literal here.
  // ActOnStringLiteral() copies the string data into the literal, so it's
  // ok that the Token points to StrBuffer.
  Token Toks[1];
  Toks[0].startToken();
  Toks[0].setKind(tok::string_literal);
  Toks[0].setLocation(StartLoc);
  Toks[0].setLiteralData(StrBuffer.data());
  Toks[0].setLength(StrBuffer.size());
  StringLiteral *UuidString =
      cast<StringLiteral>(Actions.ActOnStringLiteral(Toks, nullptr).get());
  ArgExprs.push_back(UuidString);
}

if (!T.consumeClose()) {
  Attrs.addNew(UuidIdent, SourceRange(UuidLoc, T.getCloseLocation()), nullptr,
               SourceLocation(), ArgExprs.data(), ArgExprs.size(),
               ParsedAttr::AS_Microsoft);
}
4642}

4644/// ParseMicrosoftAttributes - Parse Microsoft attributes [Attr]
4645///
4646/// [MS] ms-attribute:
4647///             '[' token-seq ']'
4648///
4649/// [MS] ms-attribute-seq:
4650///             ms-attribute[opt]
4651///             ms-attribute ms-attribute-seq
4652void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
                                    SourceLocation *endLoc) {
assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list")(static_cast<void> (0));

do {
  // FIXME: If this is actually a C++11 attribute, parse it as one.
  BalancedDelimiterTracker T(*this, tok::l_square);
  T.consumeOpen();

  // Skip most ms attributes except for a specific list.
  while (true) {
    SkipUntil(tok::r_square, tok::identifier,
              StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
    if (Tok.is(tok::code_completion)) {
      cutOffParsing();
      Actions.CodeCompleteAttribute(AttributeCommonInfo::AS_Microsoft,
                                    Sema::AttributeCompletion::Attribute,
                                    /*Scope=*/nullptr);
      break;
    }
    if (Tok.isNot(tok::identifier)) // ']', but also eof
      break;
    if (Tok.getIdentifierInfo()->getName() == "uuid")
      ParseMicrosoftUuidAttributeArgs(attrs);
    else
      ConsumeToken();
  }

  T.consumeClose();
  if (endLoc)
    *endLoc = T.getCloseLocation();
} while (Tok.is(tok::l_square));
4684}

4686void Parser::ParseMicrosoftIfExistsClassDeclaration(
  DeclSpec::TST TagType, ParsedAttributes &AccessAttrs,
  AccessSpecifier &CurAS) {
IfExistsCondition Result;
if (ParseMicrosoftIfExistsCondition(Result))
  return;

BalancedDelimiterTracker Braces(*this, tok::l_brace);
if (Braces.consumeOpen()) {
  Diag(Tok, diag::err_expected) << tok::l_brace;
  return;
}

switch (Result.Behavior) {
case IEB_Parse:
  // Parse the declarations below.
  break;

case IEB_Dependent:
  Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
    << Result.IsIfExists;
  // Fall through to skip.
  LLVM_FALLTHROUGH[[gnu::fallthrough]];

case IEB_Skip:
  Braces.skipToEnd();
  return;
}

while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
  // __if_exists, __if_not_exists can nest.
  if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
    ParseMicrosoftIfExistsClassDeclaration(TagType,
                                           AccessAttrs, CurAS);
    continue;
  }

  // Check for extraneous top-level semicolon.
  if (Tok.is(tok::semi)) {
    ConsumeExtraSemi(InsideStruct, TagType);
    continue;
  }

  AccessSpecifier AS = getAccessSpecifierIfPresent();
  if (AS != AS_none) {
    // Current token is a C++ access specifier.
    CurAS = AS;
    SourceLocation ASLoc = Tok.getLocation();
    ConsumeToken();
    if (Tok.is(tok::colon))
      Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation(),
                                   ParsedAttributesView{});
    else
      Diag(Tok, diag::err_expected) << tok::colon;
    ConsumeToken();
    continue;
  }

  // Parse all the comma separated declarators.
  ParseCXXClassMemberDeclaration(CurAS, AccessAttrs);
}

Braces.consumeClose();
4749}

←

/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/include/clang/Lex/Token.h

→

1//===--- Token.h - Token interface ------------------------------*- C++ -*-===//
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 defines the Token interface.
10//
11//===----------------------------------------------------------------------===//

13#ifndef LLVM_CLANG_LEX_TOKEN_H
14#define LLVM_CLANG_LEX_TOKEN_H

16#include "clang/Basic/SourceLocation.h"
17#include "clang/Basic/TokenKinds.h"
18#include "llvm/ADT/StringRef.h"
19#include <cassert>

21namespace clang {

23class IdentifierInfo;

25/// Token - This structure provides full information about a lexed token.
26/// It is not intended to be space efficient, it is intended to return as much
27/// information as possible about each returned token.  This is expected to be
28/// compressed into a smaller form if memory footprint is important.
29///
30/// The parser can create a special "annotation token" representing a stream of
31/// tokens that were parsed and semantically resolved, e.g.: "foo::MyClass<int>"
32/// can be represented by a single typename annotation token that carries
33/// information about the SourceRange of the tokens and the type object.
34class Token {
/// The location of the token. This is actually a SourceLocation.
SourceLocation::UIntTy Loc;

// Conceptually these next two fields could be in a union.  However, this
// causes gcc 4.2 to pessimize LexTokenInternal, a very performance critical
// routine. Keeping as separate members with casts until a more beautiful fix
// presents itself.

/// UintData - This holds either the length of the token text, when
/// a normal token, or the end of the SourceRange when an annotation
/// token.
SourceLocation::UIntTy UintData;

/// PtrData - This is a union of four different pointer types, which depends
/// on what type of token this is:
///  Identifiers, keywords, etc:
///    This is an IdentifierInfo*, which contains the uniqued identifier
///    spelling.
///  Literals:  isLiteral() returns true.
///    This is a pointer to the start of the token in a text buffer, which
///    may be dirty (have trigraphs / escaped newlines).
///  Annotations (resolved type names, C++ scopes, etc): isAnnotation().
///    This is a pointer to sema-specific data for the annotation token.
///  Eof:
//     This is a pointer to a Decl.
///  Other:
///    This is null.
void *PtrData;

/// Kind - The actual flavor of token this is.
tok::TokenKind Kind;

/// Flags - Bits we track about this token, members of the TokenFlags enum.
unsigned short Flags;

70public:
// Various flags set per token:
enum TokenFlags {
  StartOfLine = 0x01,   // At start of line or only after whitespace
                        // (considering the line after macro expansion).
  LeadingSpace = 0x02,  // Whitespace exists before this token (considering
                        // whitespace after macro expansion).
  DisableExpand = 0x04, // This identifier may never be macro expanded.
  NeedsCleaning = 0x08, // Contained an escaped newline or trigraph.
  LeadingEmptyMacro = 0x10, // Empty macro exists before this token.
  HasUDSuffix = 0x20,  // This string or character literal has a ud-suffix.
  HasUCN = 0x40,       // This identifier contains a UCN.
  IgnoredComma = 0x80, // This comma is not a macro argument separator (MS).
  StringifiedInMacro = 0x100, // This string or character literal is formed by
                              // macro stringizing or charizing operator.
  CommaAfterElided = 0x200, // The comma following this token was elided (MS).
  IsEditorPlaceholder = 0x400, // This identifier is a placeholder.
  IsReinjected = 0x800, // A phase 4 token that was produced before and
                        // re-added, e.g. via EnterTokenStream. Annotation
                        // tokens are *not* reinjected.
};

tok::TokenKind getKind() const { return Kind; }
void setKind(tok::TokenKind K) { Kind = K; }

/// is/isNot - Predicates to check if this token is a specific kind, as in
/// "if (Tok.is(tok::l_brace)) {...}".
bool is(tok::TokenKind K) const { return Kind == K; }
8
←
Assuming 'K' is not equal to field 'Kind'→
9
←
Returning zero, which participates in a condition later→
21
←
Assuming 'K' is equal to field 'Kind'→
22
←
Returning the value 1, which participates in a condition later→
25
←
Assuming 'K' is equal to field 'Kind'→
26
←
Returning the value 1, which participates in a condition later→
bool isNot(tok::TokenKind K) const { return Kind != K; }
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const {
  return is(K1) || is(K2);
}
template <typename... Ts>
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2, Ts... Ks) const {
  return is(K1) || isOneOf(K2, Ks...);
}

/// Return true if this is a raw identifier (when lexing
/// in raw mode) or a non-keyword identifier (when lexing in non-raw mode).
bool isAnyIdentifier() const {
  return tok::isAnyIdentifier(getKind());
}

/// Return true if this is a "literal", like a numeric
/// constant, string, etc.
bool isLiteral() const {
  return tok::isLiteral(getKind());
}

/// Return true if this is any of tok::annot_* kind tokens.
bool isAnnotation() const {
  return tok::isAnnotation(getKind());
}

/// Return a source location identifier for the specified
/// offset in the current file.
SourceLocation getLocation() const {
  return SourceLocation::getFromRawEncoding(Loc);
}
unsigned getLength() const {
  assert(!isAnnotation() && "Annotation tokens have no length field")(static_cast<void> (0));
  return UintData;
}

void setLocation(SourceLocation L) { Loc = L.getRawEncoding(); }
void setLength(unsigned Len) {
  assert(!isAnnotation() && "Annotation tokens have no length field")(static_cast<void> (0));
  UintData = Len;
}

SourceLocation getAnnotationEndLoc() const {
  assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token")(static_cast<void> (0));
  return SourceLocation::getFromRawEncoding(UintData ? UintData : Loc);
}
void setAnnotationEndLoc(SourceLocation L) {
  assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token")(static_cast<void> (0));
  UintData = L.getRawEncoding();
}

SourceLocation getLastLoc() const {
  return isAnnotation() ? getAnnotationEndLoc() : getLocation();
}

SourceLocation getEndLoc() const {
  return isAnnotation() ? getAnnotationEndLoc()
                        : getLocation().getLocWithOffset(getLength());
}

/// SourceRange of the group of tokens that this annotation token
/// represents.
SourceRange getAnnotationRange() const {
  return SourceRange(getLocation(), getAnnotationEndLoc());
}
void setAnnotationRange(SourceRange R) {
  setLocation(R.getBegin());
  setAnnotationEndLoc(R.getEnd());
}

const char *getName() const { return tok::getTokenName(Kind); }

/// Reset all flags to cleared.
void startToken() {
  Kind = tok::unknown;
  Flags = 0;
  PtrData = nullptr;
  UintData = 0;
  Loc = SourceLocation().getRawEncoding();
}

IdentifierInfo *getIdentifierInfo() const {
  assert(isNot(tok::raw_identifier) &&(static_cast<void> (0))
         "getIdentifierInfo() on a tok::raw_identifier token!")(static_cast<void> (0));
  assert(!isAnnotation() &&(static_cast<void> (0))
         "getIdentifierInfo() on an annotation token!")(static_cast<void> (0));
  if (isLiteral()) return nullptr;
  if (is(tok::eof)) return nullptr;
  return (IdentifierInfo*) PtrData;
}
void setIdentifierInfo(IdentifierInfo *II) {
  PtrData = (void*) II;
}

const void *getEofData() const {
  assert(is(tok::eof))(static_cast<void> (0));
  return reinterpret_cast<const void *>(PtrData);
}
void setEofData(const void *D) {
  assert(is(tok::eof))(static_cast<void> (0));
  assert(!PtrData)(static_cast<void> (0));
  PtrData = const_cast<void *>(D);
}

/// getRawIdentifier - For a raw identifier token (i.e., an identifier
/// lexed in raw mode), returns a reference to the text substring in the
/// buffer if known.
StringRef getRawIdentifier() const {
  assert(is(tok::raw_identifier))(static_cast<void> (0));
  return StringRef(reinterpret_cast<const char *>(PtrData), getLength());
}
void setRawIdentifierData(const char *Ptr) {
  assert(is(tok::raw_identifier))(static_cast<void> (0));
  PtrData = const_cast<char*>(Ptr);
}

/// getLiteralData - For a literal token (numeric constant, string, etc), this
/// returns a pointer to the start of it in the text buffer if known, null
/// otherwise.
const char *getLiteralData() const {
  assert(isLiteral() && "Cannot get literal data of non-literal")(static_cast<void> (0));
  return reinterpret_cast<const char*>(PtrData);
}
void setLiteralData(const char *Ptr) {
  assert(isLiteral() && "Cannot set literal data of non-literal")(static_cast<void> (0));
  PtrData = const_cast<char*>(Ptr);
}

void *getAnnotationValue() const {
  assert(isAnnotation() && "Used AnnotVal on non-annotation token")(static_cast<void> (0));
  return PtrData;
}
void setAnnotationValue(void *val) {
  assert(isAnnotation() && "Used AnnotVal on non-annotation token")(static_cast<void> (0));
  PtrData = val;
}

/// Set the specified flag.
void setFlag(TokenFlags Flag) {
  Flags |= Flag;
}

/// Get the specified flag.
bool getFlag(TokenFlags Flag) const {
  return (Flags & Flag) != 0;
}

/// Unset the specified flag.
void clearFlag(TokenFlags Flag) {
  Flags &= ~Flag;
}

/// Return the internal represtation of the flags.
///
/// This is only intended for low-level operations such as writing tokens to
/// disk.
unsigned getFlags() const {
  return Flags;
}

/// Set a flag to either true or false.
void setFlagValue(TokenFlags Flag, bool Val) {
  if (Val)
    setFlag(Flag);
  else
    clearFlag(Flag);
}

/// isAtStartOfLine - Return true if this token is at the start of a line.
///
bool isAtStartOfLine() const { return getFlag(StartOfLine); }

/// Return true if this token has whitespace before it.
///
bool hasLeadingSpace() const { return getFlag(LeadingSpace); }

/// Return true if this identifier token should never
/// be expanded in the future, due to C99 6.10.3.4p2.
bool isExpandDisabled() const { return getFlag(DisableExpand); }

/// Return true if we have an ObjC keyword identifier.
bool isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const;

/// Return the ObjC keyword kind.
tok::ObjCKeywordKind getObjCKeywordID() const;

/// Return true if this token has trigraphs or escaped newlines in it.
bool needsCleaning() const { return getFlag(NeedsCleaning); }

/// Return true if this token has an empty macro before it.
///
bool hasLeadingEmptyMacro() const { return getFlag(LeadingEmptyMacro); }

/// Return true if this token is a string or character literal which
/// has a ud-suffix.
bool hasUDSuffix() const { return getFlag(HasUDSuffix); }

/// Returns true if this token contains a universal character name.
bool hasUCN() const { return getFlag(HasUCN); }

/// Returns true if this token is formed by macro by stringizing or charizing
/// operator.
bool stringifiedInMacro() const { return getFlag(StringifiedInMacro); }

/// Returns true if the comma after this token was elided.
bool commaAfterElided() const { return getFlag(CommaAfterElided); }

/// Returns true if this token is an editor placeholder.
///
/// Editor placeholders are produced by the code-completion engine and are
/// represented as characters between '<#' and '#>' in the source code. The
/// lexer uses identifier tokens to represent placeholders.
bool isEditorPlaceholder() const { return getFlag(IsEditorPlaceholder); }
311};

313/// Information about the conditional stack (\#if directives)
314/// currently active.
315struct PPConditionalInfo {
/// Location where the conditional started.
SourceLocation IfLoc;

/// True if this was contained in a skipping directive, e.g.,
/// in a "\#if 0" block.
bool WasSkipping;

/// True if we have emitted tokens already, and now we're in
/// an \#else block or something.  Only useful in Skipping blocks.
bool FoundNonSkip;

/// True if we've seen a \#else in this block.  If so,
/// \#elif/\#else directives are not allowed.
bool FoundElse;
330};

332} // end namespace clang

334#endif // LLVM_CLANG_LEX_TOKEN_H

←

/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/include/clang/Sema/DeclSpec.h

1//===--- DeclSpec.h - Parsed declaration specifiers -------------*- C++ -*-===//
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/// \file
10/// This file defines the classes used to store parsed information about
11/// declaration-specifiers and declarators.
12///
13/// \verbatim
14///   static const int volatile x, *y, *(*(*z)[10])(const void *x);
15///   ------------------------- -  --  ---------------------------
16///     declaration-specifiers  \  |   /
17///                            declarators
18/// \endverbatim
19///
20//===----------------------------------------------------------------------===//

22#ifndef LLVM_CLANG_SEMA_DECLSPEC_H
23#define LLVM_CLANG_SEMA_DECLSPEC_H

25#include "clang/AST/DeclCXX.h"
26#include "clang/AST/DeclObjCCommon.h"
27#include "clang/AST/NestedNameSpecifier.h"
28#include "clang/Basic/ExceptionSpecificationType.h"
29#include "clang/Basic/Lambda.h"
30#include "clang/Basic/OperatorKinds.h"
31#include "clang/Basic/Specifiers.h"
32#include "clang/Lex/Token.h"
33#include "clang/Sema/Ownership.h"
34#include "clang/Sema/ParsedAttr.h"
35#include "llvm/ADT/SmallVector.h"
36#include "llvm/Support/Compiler.h"
37#include "llvm/Support/ErrorHandling.h"

39namespace clang {
class ASTContext;
class CXXRecordDecl;
class TypeLoc;
class LangOptions;
class IdentifierInfo;
class NamespaceAliasDecl;
class NamespaceDecl;
class ObjCDeclSpec;
class Sema;
class Declarator;
struct TemplateIdAnnotation;

52/// Represents a C++ nested-name-specifier or a global scope specifier.
53///
54/// These can be in 3 states:
55///   1) Not present, identified by isEmpty()
56///   2) Present, identified by isNotEmpty()
57///      2.a) Valid, identified by isValid()
58///      2.b) Invalid, identified by isInvalid().
59///
60/// isSet() is deprecated because it mostly corresponded to "valid" but was
61/// often used as if it meant "present".
62///
63/// The actual scope is described by getScopeRep().
64class CXXScopeSpec {
SourceRange Range;
NestedNameSpecifierLocBuilder Builder;

68public:
SourceRange getRange() const { return Range; }
void setRange(SourceRange R) { Range = R; }
void setBeginLoc(SourceLocation Loc) { Range.setBegin(Loc); }
void setEndLoc(SourceLocation Loc) { Range.setEnd(Loc); }
SourceLocation getBeginLoc() const { return Range.getBegin(); }
SourceLocation getEndLoc() const { return Range.getEnd(); }

/// Retrieve the representation of the nested-name-specifier.
NestedNameSpecifier *getScopeRep() const {
  return Builder.getRepresentation();
}

/// Extend the current nested-name-specifier by another
/// nested-name-specifier component of the form 'type::'.
///
/// \param Context The AST context in which this nested-name-specifier
/// resides.
///
/// \param TemplateKWLoc The location of the 'template' keyword, if present.
///
/// \param TL The TypeLoc that describes the type preceding the '::'.
///
/// \param ColonColonLoc The location of the trailing '::'.
void Extend(ASTContext &Context, SourceLocation TemplateKWLoc, TypeLoc TL,
            SourceLocation ColonColonLoc);

/// Extend the current nested-name-specifier by another
/// nested-name-specifier component of the form 'identifier::'.
///
/// \param Context The AST context in which this nested-name-specifier
/// resides.
///
/// \param Identifier The identifier.
///
/// \param IdentifierLoc The location of the identifier.
///
/// \param ColonColonLoc The location of the trailing '::'.
void Extend(ASTContext &Context, IdentifierInfo *Identifier,
            SourceLocation IdentifierLoc, SourceLocation ColonColonLoc);

/// Extend the current nested-name-specifier by another
/// nested-name-specifier component of the form 'namespace::'.
///
/// \param Context The AST context in which this nested-name-specifier
/// resides.
///
/// \param Namespace The namespace.
///
/// \param NamespaceLoc The location of the namespace name.
///
/// \param ColonColonLoc The location of the trailing '::'.
void Extend(ASTContext &Context, NamespaceDecl *Namespace,
            SourceLocation NamespaceLoc, SourceLocation ColonColonLoc);

/// Extend the current nested-name-specifier by another
/// nested-name-specifier component of the form 'namespace-alias::'.
///
/// \param Context The AST context in which this nested-name-specifier
/// resides.
///
/// \param Alias The namespace alias.
///
/// \param AliasLoc The location of the namespace alias
/// name.
///
/// \param ColonColonLoc The location of the trailing '::'.
void Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
            SourceLocation AliasLoc, SourceLocation ColonColonLoc);

/// Turn this (empty) nested-name-specifier into the global
/// nested-name-specifier '::'.
void MakeGlobal(ASTContext &Context, SourceLocation ColonColonLoc);

/// Turns this (empty) nested-name-specifier into '__super'
/// nested-name-specifier.
///
/// \param Context The AST context in which this nested-name-specifier
/// resides.
///
/// \param RD The declaration of the class in which nested-name-specifier
/// appeared.
///
/// \param SuperLoc The location of the '__super' keyword.
/// name.
///
/// \param ColonColonLoc The location of the trailing '::'.
void MakeSuper(ASTContext &Context, CXXRecordDecl *RD,
               SourceLocation SuperLoc, SourceLocation ColonColonLoc);

/// Make a new nested-name-specifier from incomplete source-location
/// information.
///
/// FIXME: This routine should be used very, very rarely, in cases where we
/// need to synthesize a nested-name-specifier. Most code should instead use
/// \c Adopt() with a proper \c NestedNameSpecifierLoc.
void MakeTrivial(ASTContext &Context, NestedNameSpecifier *Qualifier,
                 SourceRange R);

/// Adopt an existing nested-name-specifier (with source-range
/// information).
void Adopt(NestedNameSpecifierLoc Other);

/// Retrieve a nested-name-specifier with location information, copied
/// into the given AST context.
///
/// \param Context The context into which this nested-name-specifier will be
/// copied.
NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const;

/// Retrieve the location of the name in the last qualifier
/// in this nested name specifier.
///
/// For example, the location of \c bar
/// in
/// \verbatim
///   \::foo::bar<0>::
///           ^~~
/// \endverbatim
SourceLocation getLastQualifierNameLoc() const;

/// No scope specifier.
bool isEmpty() const { return Range.isInvalid() && getScopeRep() == nullptr; }
30
←
Assuming the condition is false→
31
←
Returning zero, which participates in a condition later→
/// A scope specifier is present, but may be valid or invalid.
bool isNotEmpty() const { return !isEmpty(); }
29
←
Calling 'CXXScopeSpec::isEmpty'→
32
←
Returning from 'CXXScopeSpec::isEmpty'→
33
←
Returning the value 1, which participates in a condition later→

/// An error occurred during parsing of the scope specifier.
bool isInvalid() const { return Range.isValid() && getScopeRep() == nullptr; }
16
←
Returning zero, which participates in a condition later→
/// A scope specifier is present, and it refers to a real scope.
bool isValid() const { return getScopeRep() != nullptr; }

/// Indicate that this nested-name-specifier is invalid.
void SetInvalid(SourceRange R) {
  assert(R.isValid() && "Must have a valid source range")(static_cast<void> (0));
  if (Range.getBegin().isInvalid())
    Range.setBegin(R.getBegin());
  Range.setEnd(R.getEnd());
  Builder.Clear();
}

/// Deprecated.  Some call sites intend isNotEmpty() while others intend
/// isValid().
bool isSet() const { return getScopeRep() != nullptr; }

void clear() {
  Range = SourceRange();
  Builder.Clear();
}

/// Retrieve the data associated with the source-location information.
char *location_data() const { return Builder.getBuffer().first; }

/// Retrieve the size of the data associated with source-location
/// information.
unsigned location_size() const { return Builder.getBuffer().second; }
223};

225/// Captures information about "declaration specifiers".
226///
227/// "Declaration specifiers" encompasses storage-class-specifiers,
228/// type-specifiers, type-qualifiers, and function-specifiers.
229class DeclSpec {
230public:
/// storage-class-specifier
/// \note The order of these enumerators is important for diagnostics.
enum SCS {
  SCS_unspecified = 0,
  SCS_typedef,
  SCS_extern,
  SCS_static,
  SCS_auto,
  SCS_register,
  SCS_private_extern,
  SCS_mutable
};

// Import thread storage class specifier enumeration and constants.
// These can be combined with SCS_extern and SCS_static.
typedef ThreadStorageClassSpecifier TSCS;
static const TSCS TSCS_unspecified = clang::TSCS_unspecified;
static const TSCS TSCS___thread = clang::TSCS___thread;
static const TSCS TSCS_thread_local = clang::TSCS_thread_local;
static const TSCS TSCS__Thread_local = clang::TSCS__Thread_local;

enum TSC {
  TSC_unspecified,
  TSC_imaginary,
  TSC_complex
};

// Import type specifier type enumeration and constants.
typedef TypeSpecifierType TST;
static const TST TST_unspecified = clang::TST_unspecified;
static const TST TST_void = clang::TST_void;
static const TST TST_char = clang::TST_char;
static const TST TST_wchar = clang::TST_wchar;
static const TST TST_char8 = clang::TST_char8;
static const TST TST_char16 = clang::TST_char16;
static const TST TST_char32 = clang::TST_char32;
static const TST TST_int = clang::TST_int;
static const TST TST_int128 = clang::TST_int128;
static const TST TST_extint = clang::TST_extint;
static const TST TST_half = clang::TST_half;
static const TST TST_BFloat16 = clang::TST_BFloat16;
static const TST TST_float = clang::TST_float;
static const TST TST_double = clang::TST_double;
static const TST TST_float16 = clang::TST_Float16;
static const TST TST_accum = clang::TST_Accum;
static const TST TST_fract = clang::TST_Fract;
static const TST TST_float128 = clang::TST_float128;
static const TST TST_bool = clang::TST_bool;
static const TST TST_decimal32 = clang::TST_decimal32;
static const TST TST_decimal64 = clang::TST_decimal64;
static const TST TST_decimal128 = clang::TST_decimal128;
static const TST TST_enum = clang::TST_enum;
static const TST TST_union = clang::TST_union;
static const TST TST_struct = clang::TST_struct;
static const TST TST_interface = clang::TST_interface;
static const TST TST_class = clang::TST_class;
static const TST TST_typename = clang::TST_typename;
static const TST TST_typeofType = clang::TST_typeofType;
static const TST TST_typeofExpr = clang::TST_typeofExpr;
static const TST TST_decltype = clang::TST_decltype;
static const TST TST_decltype_auto = clang::TST_decltype_auto;
static const TST TST_underlyingType = clang::TST_underlyingType;
static const TST TST_auto = clang::TST_auto;
static const TST TST_auto_type = clang::TST_auto_type;
static const TST TST_unknown_anytype = clang::TST_unknown_anytype;
static const TST TST_atomic = clang::TST_atomic;
297#define GENERIC_IMAGE_TYPE(ImgType, Id) \
static const TST TST_##ImgType##_t = clang::TST_##ImgType##_t;
299#include "clang/Basic/OpenCLImageTypes.def"
static const TST TST_error = clang::TST_error;

// type-qualifiers
enum TQ {   // NOTE: These flags must be kept in sync with Qualifiers::TQ.
  TQ_unspecified = 0,
  TQ_const       = 1,
  TQ_restrict    = 2,
  TQ_volatile    = 4,
  TQ_unaligned   = 8,
  // This has no corresponding Qualifiers::TQ value, because it's not treated
  // as a qualifier in our type system.
  TQ_atomic      = 16
};

/// ParsedSpecifiers - Flags to query which specifiers were applied.  This is
/// returned by getParsedSpecifiers.
enum ParsedSpecifiers {
  PQ_None                  = 0,
  PQ_StorageClassSpecifier = 1,
  PQ_TypeSpecifier         = 2,
  PQ_TypeQualifier         = 4,
  PQ_FunctionSpecifier     = 8
  // FIXME: Attributes should be included here.
};

325private:
// storage-class-specifier
/*SCS*/unsigned StorageClassSpec : 3;
/*TSCS*/unsigned ThreadStorageClassSpec : 2;
unsigned SCS_extern_in_linkage_spec : 1;

// type-specifier
/*TypeSpecifierWidth*/ unsigned TypeSpecWidth : 2;
/*TSC*/unsigned TypeSpecComplex : 2;
/*TSS*/unsigned TypeSpecSign : 2;
/*TST*/unsigned TypeSpecType : 6;
unsigned TypeAltiVecVector : 1;
unsigned TypeAltiVecPixel : 1;
unsigned TypeAltiVecBool : 1;
unsigned TypeSpecOwned : 1;
unsigned TypeSpecPipe : 1;
unsigned TypeSpecSat : 1;
unsigned ConstrainedAuto : 1;

// type-qualifiers
unsigned TypeQualifiers : 5;  // Bitwise OR of TQ.

// function-specifier
unsigned FS_inline_specified : 1;
unsigned FS_forceinline_specified: 1;
unsigned FS_virtual_specified : 1;
unsigned FS_noreturn_specified : 1;

// friend-specifier
unsigned Friend_specified : 1;

// constexpr-specifier
unsigned ConstexprSpecifier : 2;

union {
  UnionParsedType TypeRep;
  Decl *DeclRep;
  Expr *ExprRep;
  TemplateIdAnnotation *TemplateIdRep;
};

/// ExplicitSpecifier - Store information about explicit spicifer.
ExplicitSpecifier FS_explicit_specifier;

// attributes.
ParsedAttributes Attrs;

// Scope specifier for the type spec, if applicable.
CXXScopeSpec TypeScope;

// SourceLocation info.  These are null if the item wasn't specified or if
// the setting was synthesized.
SourceRange Range;

SourceLocation StorageClassSpecLoc, ThreadStorageClassSpecLoc;
SourceRange TSWRange;
SourceLocation TSCLoc, TSSLoc, TSTLoc, AltiVecLoc, TSSatLoc;
/// TSTNameLoc - If TypeSpecType is any of class, enum, struct, union,
/// typename, then this is the location of the named type (if present);
/// otherwise, it is the same as TSTLoc. Hence, the pair TSTLoc and
/// TSTNameLoc provides source range info for tag types.
SourceLocation TSTNameLoc;
SourceRange TypeofParensRange;
SourceLocation TQ_constLoc, TQ_restrictLoc, TQ_volatileLoc, TQ_atomicLoc,
    TQ_unalignedLoc;
SourceLocation FS_inlineLoc, FS_virtualLoc, FS_explicitLoc, FS_noreturnLoc;
SourceLocation FS_explicitCloseParenLoc;
SourceLocation FS_forceinlineLoc;
SourceLocation FriendLoc, ModulePrivateLoc, ConstexprLoc;
SourceLocation TQ_pipeLoc;

WrittenBuiltinSpecs writtenBS;
void SaveWrittenBuiltinSpecs();

ObjCDeclSpec *ObjCQualifiers;

static bool isTypeRep(TST T) {
  return (T == TST_typename || T == TST_typeofType ||
          T == TST_underlyingType || T == TST_atomic);
}
static bool isExprRep(TST T) {
  return (T == TST_typeofExpr || T == TST_decltype || T == TST_extint);
}
static bool isTemplateIdRep(TST T) {
  return (T == TST_auto || T == TST_decltype_auto);
}

DeclSpec(const DeclSpec &) = delete;
void operator=(const DeclSpec &) = delete;
414public:
static bool isDeclRep(TST T) {
  return (T == TST_enum || T == TST_struct ||
          T == TST_interface || T == TST_union ||
          T == TST_class);
}

DeclSpec(AttributeFactory &attrFactory)
    : StorageClassSpec(SCS_unspecified),
      ThreadStorageClassSpec(TSCS_unspecified),
      SCS_extern_in_linkage_spec(false),
      TypeSpecWidth(static_cast<unsigned>(TypeSpecifierWidth::Unspecified)),
      TypeSpecComplex(TSC_unspecified),
      TypeSpecSign(static_cast<unsigned>(TypeSpecifierSign::Unspecified)),
      TypeSpecType(TST_unspecified), TypeAltiVecVector(false),
      TypeAltiVecPixel(false), TypeAltiVecBool(false), TypeSpecOwned(false),
      TypeSpecPipe(false), TypeSpecSat(false), ConstrainedAuto(false),
      TypeQualifiers(TQ_unspecified), FS_inline_specified(false),
      FS_forceinline_specified(false), FS_virtual_specified(false),
      FS_noreturn_specified(false), Friend_specified(false),
      ConstexprSpecifier(
          static_cast<unsigned>(ConstexprSpecKind::Unspecified)),
      FS_explicit_specifier(), Attrs(attrFactory), writtenBS(),
      ObjCQualifiers(nullptr) {}

// storage-class-specifier
SCS getStorageClassSpec() const { return (SCS)StorageClassSpec; }
TSCS getThreadStorageClassSpec() const {
  return (TSCS)ThreadStorageClassSpec;
}
bool isExternInLinkageSpec() const { return SCS_extern_in_linkage_spec; }
void setExternInLinkageSpec(bool Value) {
  SCS_extern_in_linkage_spec = Value;
}

SourceLocation getStorageClassSpecLoc() const { return StorageClassSpecLoc; }
SourceLocation getThreadStorageClassSpecLoc() const {
  return ThreadStorageClassSpecLoc;
}

void ClearStorageClassSpecs() {
  StorageClassSpec           = DeclSpec::SCS_unspecified;
  ThreadStorageClassSpec     = DeclSpec::TSCS_unspecified;
  SCS_extern_in_linkage_spec = false;
  StorageClassSpecLoc        = SourceLocation();
  ThreadStorageClassSpecLoc  = SourceLocation();
}

void ClearTypeSpecType() {
  TypeSpecType = DeclSpec::TST_unspecified;
  TypeSpecOwned = false;
  TSTLoc = SourceLocation();
}

// type-specifier
TypeSpecifierWidth getTypeSpecWidth() const {
  return static_cast<TypeSpecifierWidth>(TypeSpecWidth);
}
TSC getTypeSpecComplex() const { return (TSC)TypeSpecComplex; }
TypeSpecifierSign getTypeSpecSign() const {
  return static_cast<TypeSpecifierSign>(TypeSpecSign);
}
TST getTypeSpecType() const { return (TST)TypeSpecType; }
bool isTypeAltiVecVector() const { return TypeAltiVecVector; }
bool isTypeAltiVecPixel() const { return TypeAltiVecPixel; }
bool isTypeAltiVecBool() const { return TypeAltiVecBool; }
bool isTypeSpecOwned() const { return TypeSpecOwned; }
bool isTypeRep() const { return isTypeRep((TST) TypeSpecType); }
bool isTypeSpecPipe() const { return TypeSpecPipe; }
bool isTypeSpecSat() const { return TypeSpecSat; }
bool isConstrainedAuto() const { return ConstrainedAuto; }

ParsedType getRepAsType() const {
  assert(isTypeRep((TST) TypeSpecType) && "DeclSpec does not store a type")(static_cast<void> (0));
  return TypeRep;
}
Decl *getRepAsDecl() const {
  assert(isDeclRep((TST) TypeSpecType) && "DeclSpec does not store a decl")(static_cast<void> (0));
  return DeclRep;
}
Expr *getRepAsExpr() const {
  assert(isExprRep((TST) TypeSpecType) && "DeclSpec does not store an expr")(static_cast<void> (0));
  return ExprRep;
}
TemplateIdAnnotation *getRepAsTemplateId() const {
  assert(isTemplateIdRep((TST) TypeSpecType) &&(static_cast<void> (0))
         "DeclSpec does not store a template id")(static_cast<void> (0));
  return TemplateIdRep;
}
CXXScopeSpec &getTypeSpecScope() { return TypeScope; }
const CXXScopeSpec &getTypeSpecScope() const { return TypeScope; }

SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) { return Range; }
SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getBegin(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getEnd(); }

SourceLocation getTypeSpecWidthLoc() const { return TSWRange.getBegin(); }
SourceRange getTypeSpecWidthRange() const { return TSWRange; }
SourceLocation getTypeSpecComplexLoc() const { return TSCLoc; }
SourceLocation getTypeSpecSignLoc() const { return TSSLoc; }
SourceLocation getTypeSpecTypeLoc() const { return TSTLoc; }
SourceLocation getAltiVecLoc() const { return AltiVecLoc; }
SourceLocation getTypeSpecSatLoc() const { return TSSatLoc; }

SourceLocation getTypeSpecTypeNameLoc() const {
  assert(isDeclRep((TST) TypeSpecType) || TypeSpecType == TST_typename)(static_cast<void> (0));
  return TSTNameLoc;
}

SourceRange getTypeofParensRange() const { return TypeofParensRange; }
void setTypeofParensRange(SourceRange range) { TypeofParensRange = range; }

bool hasAutoTypeSpec() const {
  return (TypeSpecType == TST_auto || TypeSpecType == TST_auto_type ||
          TypeSpecType == TST_decltype_auto);
}

bool hasTagDefinition() const;

/// Turn a type-specifier-type into a string like "_Bool" or "union".
static const char *getSpecifierName(DeclSpec::TST T,
                                    const PrintingPolicy &Policy);
static const char *getSpecifierName(DeclSpec::TQ Q);
static const char *getSpecifierName(TypeSpecifierSign S);
static const char *getSpecifierName(DeclSpec::TSC C);
static const char *getSpecifierName(TypeSpecifierWidth W);
static const char *getSpecifierName(DeclSpec::SCS S);
static const char *getSpecifierName(DeclSpec::TSCS S);
static const char *getSpecifierName(ConstexprSpecKind C);

// type-qualifiers

/// getTypeQualifiers - Return a set of TQs.
unsigned getTypeQualifiers() const { return TypeQualifiers; }
SourceLocation getConstSpecLoc() const { return TQ_constLoc; }
SourceLocation getRestrictSpecLoc() const { return TQ_restrictLoc; }
SourceLocation getVolatileSpecLoc() const { return TQ_volatileLoc; }
SourceLocation getAtomicSpecLoc() const { return TQ_atomicLoc; }
SourceLocation getUnalignedSpecLoc() const { return TQ_unalignedLoc; }
SourceLocation getPipeLoc() const { return TQ_pipeLoc; }

/// Clear out all of the type qualifiers.
void ClearTypeQualifiers() {
  TypeQualifiers = 0;
  TQ_constLoc = SourceLocation();
  TQ_restrictLoc = SourceLocation();
  TQ_volatileLoc = SourceLocation();
  TQ_atomicLoc = SourceLocation();
  TQ_unalignedLoc = SourceLocation();
  TQ_pipeLoc = SourceLocation();
}

// function-specifier
bool isInlineSpecified() const {
  return FS_inline_specified | FS_forceinline_specified;
}
SourceLocation getInlineSpecLoc() const {
  return FS_inline_specified ? FS_inlineLoc : FS_forceinlineLoc;
}

ExplicitSpecifier getExplicitSpecifier() const {
  return FS_explicit_specifier;
}

bool isVirtualSpecified() const { return FS_virtual_specified; }
SourceLocation getVirtualSpecLoc() const { return FS_virtualLoc; }

bool hasExplicitSpecifier() const {
  return FS_explicit_specifier.isSpecified();
}
SourceLocation getExplicitSpecLoc() const { return FS_explicitLoc; }
SourceRange getExplicitSpecRange() const {
  return FS_explicit_specifier.getExpr()
             ? SourceRange(FS_explicitLoc, FS_explicitCloseParenLoc)
             : SourceRange(FS_explicitLoc);
}

bool isNoreturnSpecified() const { return FS_noreturn_specified; }
SourceLocation getNoreturnSpecLoc() const { return FS_noreturnLoc; }

void ClearFunctionSpecs() {
  FS_inline_specified = false;
  FS_inlineLoc = SourceLocation();
  FS_forceinline_specified = false;
  FS_forceinlineLoc = SourceLocation();
  FS_virtual_specified = false;
  FS_virtualLoc = SourceLocation();
  FS_explicit_specifier = ExplicitSpecifier();
  FS_explicitLoc = SourceLocation();
  FS_explicitCloseParenLoc = SourceLocation();
  FS_noreturn_specified = false;
  FS_noreturnLoc = SourceLocation();
}

/// This method calls the passed in handler on each CVRU qual being
/// set.
/// Handle - a handler to be invoked.
void forEachCVRUQualifier(
    llvm::function_ref<void(TQ, StringRef, SourceLocation)> Handle);

/// This method calls the passed in handler on each qual being
/// set.
/// Handle - a handler to be invoked.
void forEachQualifier(
    llvm::function_ref<void(TQ, StringRef, SourceLocation)> Handle);

/// Return true if any type-specifier has been found.
bool hasTypeSpecifier() const {
  return getTypeSpecType() != DeclSpec::TST_unspecified ||
         getTypeSpecWidth() != TypeSpecifierWidth::Unspecified ||
         getTypeSpecComplex() != DeclSpec::TSC_unspecified ||
         getTypeSpecSign() != TypeSpecifierSign::Unspecified;
}

/// Return a bitmask of which flavors of specifiers this
/// DeclSpec includes.
unsigned getParsedSpecifiers() const;

/// isEmpty - Return true if this declaration specifier is completely empty:
/// no tokens were parsed in the production of it.
bool isEmpty() const {
  return getParsedSpecifiers() == DeclSpec::PQ_None;
}

void SetRangeStart(SourceLocation Loc) { Range.setBegin(Loc); }
void SetRangeEnd(SourceLocation Loc) { Range.setEnd(Loc); }

/// These methods set the specified attribute of the DeclSpec and
/// return false if there was no error.  If an error occurs (for
/// example, if we tried to set "auto" on a spec with "extern"
/// already set), they return true and set PrevSpec and DiagID
/// such that
///   Diag(Loc, DiagID) << PrevSpec;
/// will yield a useful result.
///
/// TODO: use a more general approach that still allows these
/// diagnostics to be ignored when desired.
bool SetStorageClassSpec(Sema &S, SCS SC, SourceLocation Loc,
                         const char *&PrevSpec, unsigned &DiagID,
                         const PrintingPolicy &Policy);
bool SetStorageClassSpecThread(TSCS TSC, SourceLocation Loc,
                               const char *&PrevSpec, unsigned &DiagID);
bool SetTypeSpecWidth(TypeSpecifierWidth W, SourceLocation Loc,
                      const char *&PrevSpec, unsigned &DiagID,
                      const PrintingPolicy &Policy);
bool SetTypeSpecComplex(TSC C, SourceLocation Loc, const char *&PrevSpec,
                        unsigned &DiagID);
bool SetTypeSpecSign(TypeSpecifierSign S, SourceLocation Loc,
                     const char *&PrevSpec, unsigned &DiagID);
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, const PrintingPolicy &Policy);
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, ParsedType Rep,
                     const PrintingPolicy &Policy);
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, TypeResult Rep,
                     const PrintingPolicy &Policy) {
  if (Rep.isInvalid())
    return SetTypeSpecError();
  return SetTypeSpecType(T, Loc, PrevSpec, DiagID, Rep.get(), Policy);
}
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, Decl *Rep, bool Owned,
                     const PrintingPolicy &Policy);
bool SetTypeSpecType(TST T, SourceLocation TagKwLoc,
                     SourceLocation TagNameLoc, const char *&PrevSpec,
                     unsigned &DiagID, ParsedType Rep,
                     const PrintingPolicy &Policy);
bool SetTypeSpecType(TST T, SourceLocation TagKwLoc,
                     SourceLocation TagNameLoc, const char *&PrevSpec,
                     unsigned &DiagID, Decl *Rep, bool Owned,
                     const PrintingPolicy &Policy);
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, TemplateIdAnnotation *Rep,
                     const PrintingPolicy &Policy);

bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
                     unsigned &DiagID, Expr *Rep,
                     const PrintingPolicy &policy);
bool SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
                     const char *&PrevSpec, unsigned &DiagID,
                     const PrintingPolicy &Policy);
bool SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
                     const char *&PrevSpec, unsigned &DiagID,
                     const PrintingPolicy &Policy);
bool SetTypeAltiVecBool(bool isAltiVecBool, SourceLocation Loc,
                     const char *&PrevSpec, unsigned &DiagID,
                     const PrintingPolicy &Policy);
bool SetTypePipe(bool isPipe, SourceLocation Loc,
                     const char *&PrevSpec, unsigned &DiagID,
                     const PrintingPolicy &Policy);
bool SetExtIntType(SourceLocation KWLoc, Expr *BitWidth,
                   const char *&PrevSpec, unsigned &DiagID,
                   const PrintingPolicy &Policy);
bool SetTypeSpecSat(SourceLocation Loc, const char *&PrevSpec,
                    unsigned &DiagID);
bool SetTypeSpecError();
void UpdateDeclRep(Decl *Rep) {
  assert(isDeclRep((TST) TypeSpecType))(static_cast<void> (0));
  DeclRep = Rep;
}
void UpdateTypeRep(ParsedType Rep) {
  assert(isTypeRep((TST) TypeSpecType))(static_cast<void> (0));
  TypeRep = Rep;
}
void UpdateExprRep(Expr *Rep) {
  assert(isExprRep((TST) TypeSpecType))(static_cast<void> (0));
  ExprRep = Rep;
}

bool SetTypeQual(TQ T, SourceLocation Loc);

bool SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
                 unsigned &DiagID, const LangOptions &Lang);

bool setFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
                           unsigned &DiagID);
bool setFunctionSpecForceInline(SourceLocation Loc, const char *&PrevSpec,
                                unsigned &DiagID);
bool setFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec,
                            unsigned &DiagID);
bool setFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec,
                             unsigned &DiagID, ExplicitSpecifier ExplicitSpec,
                             SourceLocation CloseParenLoc);
bool setFunctionSpecNoreturn(SourceLocation Loc, const char *&PrevSpec,
                             unsigned &DiagID);

bool SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
                   unsigned &DiagID);
bool setModulePrivateSpec(SourceLocation Loc, const char *&PrevSpec,
                          unsigned &DiagID);
bool SetConstexprSpec(ConstexprSpecKind ConstexprKind, SourceLocation Loc,
                      const char *&PrevSpec, unsigned &DiagID);

bool isFriendSpecified() const { return Friend_specified; }
SourceLocation getFriendSpecLoc() const { return FriendLoc; }

bool isModulePrivateSpecified() const { return ModulePrivateLoc.isValid(); }
SourceLocation getModulePrivateSpecLoc() const { return ModulePrivateLoc; }

ConstexprSpecKind getConstexprSpecifier() const {
  return ConstexprSpecKind(ConstexprSpecifier);
}

SourceLocation getConstexprSpecLoc() const { return ConstexprLoc; }
bool hasConstexprSpecifier() const {
  return getConstexprSpecifier() != ConstexprSpecKind::Unspecified;
}

void ClearConstexprSpec() {
  ConstexprSpecifier = static_cast<unsigned>(ConstexprSpecKind::Unspecified);
  ConstexprLoc = SourceLocation();
}

AttributePool &getAttributePool() const {
  return Attrs.getPool();
}

/// Concatenates two attribute lists.
///
/// The GCC attribute syntax allows for the following:
///
/// \code
/// short __attribute__(( unused, deprecated ))
/// int __attribute__(( may_alias, aligned(16) )) var;
/// \endcode
///
/// This declares 4 attributes using 2 lists. The following syntax is
/// also allowed and equivalent to the previous declaration.
///
/// \code
/// short __attribute__((unused)) __attribute__((deprecated))
/// int __attribute__((may_alias)) __attribute__((aligned(16))) var;
/// \endcode
///
void addAttributes(ParsedAttributesView &AL) {
  Attrs.addAll(AL.begin(), AL.end());
}

bool hasAttributes() const { return !Attrs.empty(); }

ParsedAttributes &getAttributes() { return Attrs; }
const ParsedAttributes &getAttributes() const { return Attrs; }

void takeAttributesFrom(ParsedAttributes &attrs) {
  Attrs.takeAllFrom(attrs);
}

/// Finish - This does final analysis of the declspec, issuing diagnostics for
/// things like "_Imaginary" (lacking an FP type).  After calling this method,
/// DeclSpec is guaranteed self-consistent, even if an error occurred.
void Finish(Sema &S, const PrintingPolicy &Policy);

const WrittenBuiltinSpecs& getWrittenBuiltinSpecs() const {
  return writtenBS;
}

ObjCDeclSpec *getObjCQualifiers() const { return ObjCQualifiers; }
void setObjCQualifiers(ObjCDeclSpec *quals) { ObjCQualifiers = quals; }

/// Checks if this DeclSpec can stand alone, without a Declarator.
///
/// Only tag declspecs can stand alone.
bool isMissingDeclaratorOk();
818};

820/// Captures information about "declaration specifiers" specific to
821/// Objective-C.
822class ObjCDeclSpec {
823public:
/// ObjCDeclQualifier - Qualifier used on types in method
/// declarations.  Not all combinations are sensible.  Parameters
/// can be one of { in, out, inout } with one of { bycopy, byref }.
/// Returns can either be { oneway } or not.
///
/// This should be kept in sync with Decl::ObjCDeclQualifier.
enum ObjCDeclQualifier {
  DQ_None = 0x0,
  DQ_In = 0x1,
  DQ_Inout = 0x2,
  DQ_Out = 0x4,
  DQ_Bycopy = 0x8,
  DQ_Byref = 0x10,
  DQ_Oneway = 0x20,
  DQ_CSNullability = 0x40
};

ObjCDeclSpec()
    : objcDeclQualifier(DQ_None),
      PropertyAttributes(ObjCPropertyAttribute::kind_noattr), Nullability(0),
      GetterName(nullptr), SetterName(nullptr) {}

ObjCDeclQualifier getObjCDeclQualifier() const {
  return (ObjCDeclQualifier)objcDeclQualifier;
}
void setObjCDeclQualifier(ObjCDeclQualifier DQVal) {
  objcDeclQualifier = (ObjCDeclQualifier) (objcDeclQualifier | DQVal);
}
void clearObjCDeclQualifier(ObjCDeclQualifier DQVal) {
  objcDeclQualifier = (ObjCDeclQualifier) (objcDeclQualifier & ~DQVal);
}

ObjCPropertyAttribute::Kind getPropertyAttributes() const {
  return ObjCPropertyAttribute::Kind(PropertyAttributes);
}
void setPropertyAttributes(ObjCPropertyAttribute::Kind PRVal) {
  PropertyAttributes =
      (ObjCPropertyAttribute::Kind)(PropertyAttributes | PRVal);
}

NullabilityKind getNullability() const {
  assert((static_cast<void> (0))
      ((getObjCDeclQualifier() & DQ_CSNullability) ||(static_cast<void> (0))
       (getPropertyAttributes() & ObjCPropertyAttribute::kind_nullability)) &&(static_cast<void> (0))
      "Objective-C declspec doesn't have nullability")(static_cast<void> (0));
  return static_cast<NullabilityKind>(Nullability);
}

SourceLocation getNullabilityLoc() const {
  assert((static_cast<void> (0))
      ((getObjCDeclQualifier() & DQ_CSNullability) ||(static_cast<void> (0))
       (getPropertyAttributes() & ObjCPropertyAttribute::kind_nullability)) &&(static_cast<void> (0))
      "Objective-C declspec doesn't have nullability")(static_cast<void> (0));
  return NullabilityLoc;
}

void setNullability(SourceLocation loc, NullabilityKind kind) {
  assert((static_cast<void> (0))
      ((getObjCDeclQualifier() & DQ_CSNullability) ||(static_cast<void> (0))
       (getPropertyAttributes() & ObjCPropertyAttribute::kind_nullability)) &&(static_cast<void> (0))
      "Set the nullability declspec or property attribute first")(static_cast<void> (0));
  Nullability = static_cast<unsigned>(kind);
  NullabilityLoc = loc;
}

const IdentifierInfo *getGetterName() const { return GetterName; }
IdentifierInfo *getGetterName() { return GetterName; }
SourceLocation getGetterNameLoc() const { return GetterNameLoc; }
void setGetterName(IdentifierInfo *name, SourceLocation loc) {
  GetterName = name;
  GetterNameLoc = loc;
}

const IdentifierInfo *getSetterName() const { return SetterName; }
IdentifierInfo *getSetterName() { return SetterName; }
SourceLocation getSetterNameLoc() const { return SetterNameLoc; }
void setSetterName(IdentifierInfo *name, SourceLocation loc) {
  SetterName = name;
  SetterNameLoc = loc;
}

905private:
// FIXME: These two are unrelated and mutually exclusive. So perhaps
// we can put them in a union to reflect their mutual exclusivity
// (space saving is negligible).
unsigned objcDeclQualifier : 7;

// NOTE: VC++ treats enums as signed, avoid using ObjCPropertyAttribute::Kind
unsigned PropertyAttributes : NumObjCPropertyAttrsBits;

unsigned Nullability : 2;

SourceLocation NullabilityLoc;

IdentifierInfo *GetterName;    // getter name or NULL if no getter
IdentifierInfo *SetterName;    // setter name or NULL if no setter
SourceLocation GetterNameLoc; // location of the getter attribute's value
SourceLocation SetterNameLoc; // location of the setter attribute's value

923};

925/// Describes the kind of unqualified-id parsed.
926enum class UnqualifiedIdKind {
/// An identifier.
IK_Identifier,
/// An overloaded operator name, e.g., operator+.
IK_OperatorFunctionId,
/// A conversion function name, e.g., operator int.
IK_ConversionFunctionId,
/// A user-defined literal name, e.g., operator "" _i.
IK_LiteralOperatorId,
/// A constructor name.
IK_ConstructorName,
/// A constructor named via a template-id.
IK_ConstructorTemplateId,
/// A destructor name.
IK_DestructorName,
/// A template-id, e.g., f<int>.
IK_TemplateId,
/// An implicit 'self' parameter
IK_ImplicitSelfParam,
/// A deduction-guide name (a template-name)
IK_DeductionGuideName
947};

949/// Represents a C++ unqualified-id that has been parsed.
950class UnqualifiedId {
951private:
UnqualifiedId(const UnqualifiedId &Other) = delete;
const UnqualifiedId &operator=(const UnqualifiedId &) = delete;

955public:
/// Describes the kind of unqualified-id parsed.
UnqualifiedIdKind Kind;

struct OFI {
  /// The kind of overloaded operator.
  OverloadedOperatorKind Operator;

  /// The source locations of the individual tokens that name
  /// the operator, e.g., the "new", "[", and "]" tokens in
  /// operator new [].
  ///
  /// Different operators have different numbers of tokens in their name,
  /// up to three. Any remaining source locations in this array will be
  /// set to an invalid value for operators with fewer than three tokens.
  SourceLocation SymbolLocations[3];
};

/// Anonymous union that holds extra data associated with the
/// parsed unqualified-id.
union {
  /// When Kind == IK_Identifier, the parsed identifier, or when
  /// Kind == IK_UserLiteralId, the identifier suffix.
  IdentifierInfo *Identifier;

  /// When Kind == IK_OperatorFunctionId, the overloaded operator
  /// that we parsed.
  struct OFI OperatorFunctionId;

  /// When Kind == IK_ConversionFunctionId, the type that the
  /// conversion function names.
  UnionParsedType ConversionFunctionId;

  /// When Kind == IK_ConstructorName, the class-name of the type
  /// whose constructor is being referenced.
  UnionParsedType ConstructorName;

  /// When Kind == IK_DestructorName, the type referred to by the
  /// class-name.
  UnionParsedType DestructorName;

  /// When Kind == IK_DeductionGuideName, the parsed template-name.
  UnionParsedTemplateTy TemplateName;

  /// When Kind == IK_TemplateId or IK_ConstructorTemplateId,
  /// the template-id annotation that contains the template name and
  /// template arguments.
  TemplateIdAnnotation *TemplateId;
};

/// The location of the first token that describes this unqualified-id,
/// which will be the location of the identifier, "operator" keyword,
/// tilde (for a destructor), or the template name of a template-id.
SourceLocation StartLocation;

/// The location of the last token that describes this unqualified-id.
SourceLocation EndLocation;

UnqualifiedId()
    : Kind(UnqualifiedIdKind::IK_Identifier), Identifier(nullptr) {}

/// Clear out this unqualified-id, setting it to default (invalid)
/// state.
void clear() {
  Kind = UnqualifiedIdKind::IK_Identifier;
  Identifier = nullptr;
  StartLocation = SourceLocation();
  EndLocation = SourceLocation();
}

/// Determine whether this unqualified-id refers to a valid name.
bool isValid() const { return StartLocation.isValid(); }

/// Determine whether this unqualified-id refers to an invalid name.
bool isInvalid() const { return !isValid(); }

/// Determine what kind of name we have.
UnqualifiedIdKind getKind() const { return Kind; }

/// Specify that this unqualified-id was parsed as an identifier.
///
/// \param Id the parsed identifier.
/// \param IdLoc the location of the parsed identifier.
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc) {
  Kind = UnqualifiedIdKind::IK_Identifier;
  Identifier = const_cast<IdentifierInfo *>(Id);
  StartLocation = EndLocation = IdLoc;
}

/// Specify that this unqualified-id was parsed as an
/// operator-function-id.
///
/// \param OperatorLoc the location of the 'operator' keyword.
///
/// \param Op the overloaded operator.
///
/// \param SymbolLocations the locations of the individual operator symbols
/// in the operator.
void setOperatorFunctionId(SourceLocation OperatorLoc,
                           OverloadedOperatorKind Op,
                           SourceLocation SymbolLocations[3]);

/// Specify that this unqualified-id was parsed as a
/// conversion-function-id.
///
/// \param OperatorLoc the location of the 'operator' keyword.
///
/// \param Ty the type to which this conversion function is converting.
///
/// \param EndLoc the location of the last token that makes up the type name.
void setConversionFunctionId(SourceLocation OperatorLoc,
                             ParsedType Ty,
                             SourceLocation EndLoc) {
  Kind = UnqualifiedIdKind::IK_ConversionFunctionId;
  StartLocation = OperatorLoc;
  EndLocation = EndLoc;
  ConversionFunctionId = Ty;
}

/// Specific that this unqualified-id was parsed as a
/// literal-operator-id.
///
/// \param Id the parsed identifier.
///
/// \param OpLoc the location of the 'operator' keyword.
///
/// \param IdLoc the location of the identifier.
void setLiteralOperatorId(const IdentifierInfo *Id, SourceLocation OpLoc,
                            SourceLocation IdLoc) {
  Kind = UnqualifiedIdKind::IK_LiteralOperatorId;
  Identifier = const_cast<IdentifierInfo *>(Id);
  StartLocation = OpLoc;
  EndLocation = IdLoc;
}

/// Specify that this unqualified-id was parsed as a constructor name.
///
/// \param ClassType the class type referred to by the constructor name.
///
/// \param ClassNameLoc the location of the class name.
///
/// \param EndLoc the location of the last token that makes up the type name.
void setConstructorName(ParsedType ClassType,
                        SourceLocation ClassNameLoc,
                        SourceLocation EndLoc) {
  Kind = UnqualifiedIdKind::IK_ConstructorName;
  StartLocation = ClassNameLoc;
  EndLocation = EndLoc;
  ConstructorName = ClassType;
}

/// Specify that this unqualified-id was parsed as a
/// template-id that names a constructor.
///
/// \param TemplateId the template-id annotation that describes the parsed
/// template-id. This UnqualifiedId instance will take ownership of the
/// \p TemplateId and will free it on destruction.
void setConstructorTemplateId(TemplateIdAnnotation *TemplateId);

/// Specify that this unqualified-id was parsed as a destructor name.
///
/// \param TildeLoc the location of the '~' that introduces the destructor
/// name.
///
/// \param ClassType the name of the class referred to by the destructor name.
void setDestructorName(SourceLocation TildeLoc,
                       ParsedType ClassType,
                       SourceLocation EndLoc) {
  Kind = UnqualifiedIdKind::IK_DestructorName;
  StartLocation = TildeLoc;
  EndLocation = EndLoc;
  DestructorName = ClassType;
}

/// Specify that this unqualified-id was parsed as a template-id.
///
/// \param TemplateId the template-id annotation that describes the parsed
/// template-id. This UnqualifiedId instance will take ownership of the
/// \p TemplateId and will free it on destruction.
void setTemplateId(TemplateIdAnnotation *TemplateId);

/// Specify that this unqualified-id was parsed as a template-name for
/// a deduction-guide.
///
/// \param Template The parsed template-name.
/// \param TemplateLoc The location of the parsed template-name.
void setDeductionGuideName(ParsedTemplateTy Template,
                           SourceLocation TemplateLoc) {
  Kind = UnqualifiedIdKind::IK_DeductionGuideName;
  TemplateName = Template;
  StartLocation = EndLocation = TemplateLoc;
}

/// Specify that this unqualified-id is an implicit 'self'
/// parameter.
///
/// \param Id the identifier.
void setImplicitSelfParam(const IdentifierInfo *Id) {
  Kind = UnqualifiedIdKind::IK_ImplicitSelfParam;
  Identifier = const_cast<IdentifierInfo *>(Id);
  StartLocation = EndLocation = SourceLocation();
}

/// Return the source range that covers this unqualified-id.
SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(StartLocation, EndLocation);
}
SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return StartLocation; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return EndLocation; }
1164};

1166/// A set of tokens that has been cached for later parsing.
1167typedef SmallVector<Token, 4> CachedTokens;

1169/// One instance of this struct is used for each type in a
1170/// declarator that is parsed.
1171///
1172/// This is intended to be a small value object.
1173struct DeclaratorChunk {
DeclaratorChunk() {};

enum {
  Pointer, Reference, Array, Function, BlockPointer, MemberPointer, Paren, Pipe
} Kind;

/// Loc - The place where this type was defined.
SourceLocation Loc;
/// EndLoc - If valid, the place where this chunck ends.
SourceLocation EndLoc;

SourceRange getSourceRange() const {
  if (EndLoc.isInvalid())
    return SourceRange(Loc, Loc);
  return SourceRange(Loc, EndLoc);
}

ParsedAttributesView AttrList;

struct PointerTypeInfo {
  /// The type qualifiers: const/volatile/restrict/unaligned/atomic.
  unsigned TypeQuals : 5;

  /// The location of the const-qualifier, if any.
  SourceLocation ConstQualLoc;

  /// The location of the volatile-qualifier, if any.
  SourceLocation VolatileQualLoc;

  /// The location of the restrict-qualifier, if any.
  SourceLocation RestrictQualLoc;

  /// The location of the _Atomic-qualifier, if any.
  SourceLocation AtomicQualLoc;

  /// The location of the __unaligned-qualifier, if any.
  SourceLocation UnalignedQualLoc;

  void destroy() {
  }
};

struct ReferenceTypeInfo {
  /// The type qualifier: restrict. [GNU] C++ extension
  bool HasRestrict : 1;
  /// True if this is an lvalue reference, false if it's an rvalue reference.
  bool LValueRef : 1;
  void destroy() {
  }
};

struct ArrayTypeInfo {
  /// The type qualifiers for the array:
  /// const/volatile/restrict/__unaligned/_Atomic.
  unsigned TypeQuals : 5;

  /// True if this dimension included the 'static' keyword.
  unsigned hasStatic : 1;

  /// True if this dimension was [*].  In this case, NumElts is null.
  unsigned isStar : 1;

  /// This is the size of the array, or null if [] or [*] was specified.
  /// Since the parser is multi-purpose, and we don't want to impose a root
  /// expression class on all clients, NumElts is untyped.
  Expr *NumElts;

  void destroy() {}
};

/// ParamInfo - An array of paraminfo objects is allocated whenever a function
/// declarator is parsed.  There are two interesting styles of parameters
/// here:
/// K&R-style identifier lists and parameter type lists.  K&R-style identifier
/// lists will have information about the identifier, but no type information.
/// Parameter type lists will have type info (if the actions module provides
/// it), but may have null identifier info: e.g. for 'void foo(int X, int)'.
struct ParamInfo {
  IdentifierInfo *Ident;
  SourceLocation IdentLoc;
  Decl *Param;

  /// DefaultArgTokens - When the parameter's default argument
  /// cannot be parsed immediately (because it occurs within the
  /// declaration of a member function), it will be stored here as a
  /// sequence of tokens to be parsed once the class definition is
  /// complete. Non-NULL indicates that there is a default argument.
  std::unique_ptr<CachedTokens> DefaultArgTokens;

  ParamInfo() = default;
  ParamInfo(IdentifierInfo *ident, SourceLocation iloc,
            Decl *param,
            std::unique_ptr<CachedTokens> DefArgTokens = nullptr)
    : Ident(ident), IdentLoc(iloc), Param(param),
      DefaultArgTokens(std::move(DefArgTokens)) {}
};

struct TypeAndRange {
  ParsedType Ty;
  SourceRange Range;
};

struct FunctionTypeInfo {
  /// hasPrototype - This is true if the function had at least one typed
  /// parameter.  If the function is () or (a,b,c), then it has no prototype,
  /// and is treated as a K&R-style function.
  unsigned hasPrototype : 1;

  /// isVariadic - If this function has a prototype, and if that
  /// proto ends with ',...)', this is true. When true, EllipsisLoc
  /// contains the location of the ellipsis.
  unsigned isVariadic : 1;

  /// Can this declaration be a constructor-style initializer?
  unsigned isAmbiguous : 1;

  /// Whether the ref-qualifier (if any) is an lvalue reference.
  /// Otherwise, it's an rvalue reference.
  unsigned RefQualifierIsLValueRef : 1;

  /// ExceptionSpecType - An ExceptionSpecificationType value.
  unsigned ExceptionSpecType : 4;

  /// DeleteParams - If this is true, we need to delete[] Params.
  unsigned DeleteParams : 1;

  /// HasTrailingReturnType - If this is true, a trailing return type was
  /// specified.
  unsigned HasTrailingReturnType : 1;

  /// The location of the left parenthesis in the source.
  SourceLocation LParenLoc;

  /// When isVariadic is true, the location of the ellipsis in the source.
  SourceLocation EllipsisLoc;

  /// The location of the right parenthesis in the source.
  SourceLocation RParenLoc;

  /// NumParams - This is the number of formal parameters specified by the
  /// declarator.
  unsigned NumParams;

  /// NumExceptionsOrDecls - This is the number of types in the
  /// dynamic-exception-decl, if the function has one. In C, this is the
  /// number of declarations in the function prototype.
  unsigned NumExceptionsOrDecls;

  /// The location of the ref-qualifier, if any.
  ///
  /// If this is an invalid location, there is no ref-qualifier.
  SourceLocation RefQualifierLoc;

  /// The location of the 'mutable' qualifer in a lambda-declarator, if
  /// any.
  SourceLocation MutableLoc;

  /// The beginning location of the exception specification, if any.
  SourceLocation ExceptionSpecLocBeg;

  /// The end location of the exception specification, if any.
  SourceLocation ExceptionSpecLocEnd;

  /// Params - This is a pointer to a new[]'d array of ParamInfo objects that
  /// describe the parameters specified by this function declarator.  null if
  /// there are no parameters specified.
  ParamInfo *Params;

  /// DeclSpec for the function with the qualifier related info.
  DeclSpec *MethodQualifiers;

  /// AtttibuteFactory for the MethodQualifiers.
  AttributeFactory *QualAttrFactory;

  union {
    /// Pointer to a new[]'d array of TypeAndRange objects that
    /// contain the types in the function's dynamic exception specification
    /// and their locations, if there is one.
    TypeAndRange *Exceptions;

    /// Pointer to the expression in the noexcept-specifier of this
    /// function, if it has one.
    Expr *NoexceptExpr;

    /// Pointer to the cached tokens for an exception-specification
    /// that has not yet been parsed.
    CachedTokens *ExceptionSpecTokens;

    /// Pointer to a new[]'d array of declarations that need to be available
    /// for lookup inside the function body, if one exists. Does not exist in
    /// C++.
    NamedDecl **DeclsInPrototype;
  };

  /// If HasTrailingReturnType is true, this is the trailing return
  /// type specified.
  UnionParsedType TrailingReturnType;

  /// If HasTrailingReturnType is true, this is the location of the trailing
  /// return type.
  SourceLocation TrailingReturnTypeLoc;

  /// Reset the parameter list to having zero parameters.
  ///
  /// This is used in various places for error recovery.
  void freeParams() {
    for (unsigned I = 0; I < NumParams; ++I)
      Params[I].DefaultArgTokens.reset();
    if (DeleteParams) {
      delete[] Params;
      DeleteParams = false;
    }
    NumParams = 0;
  }

  void destroy() {
    freeParams();
    delete QualAttrFactory;
    delete MethodQualifiers;
    switch (getExceptionSpecType()) {
    default:
      break;
    case EST_Dynamic:
      delete[] Exceptions;
      break;
    case EST_Unparsed:
      delete ExceptionSpecTokens;
      break;
    case EST_None:
      if (NumExceptionsOrDecls != 0)
        delete[] DeclsInPrototype;
      break;
    }
  }

  DeclSpec &getOrCreateMethodQualifiers() {
    if (!MethodQualifiers) {
      QualAttrFactory = new AttributeFactory();
      MethodQualifiers = new DeclSpec(*QualAttrFactory);
    }
    return *MethodQualifiers;
  }

  /// isKNRPrototype - Return true if this is a K&R style identifier list,
  /// like "void foo(a,b,c)".  In a function definition, this will be followed
  /// by the parameter type definitions.
  bool isKNRPrototype() const { return !hasPrototype && NumParams != 0; }

  SourceLocation getLParenLoc() const { return LParenLoc; }

  SourceLocation getEllipsisLoc() const { return EllipsisLoc; }

  SourceLocation getRParenLoc() const { return RParenLoc; }

  SourceLocation getExceptionSpecLocBeg() const {
    return ExceptionSpecLocBeg;
  }

  SourceLocation getExceptionSpecLocEnd() const {
    return ExceptionSpecLocEnd;
  }

  SourceRange getExceptionSpecRange() const {
    return SourceRange(getExceptionSpecLocBeg(), getExceptionSpecLocEnd());
  }

  /// Retrieve the location of the ref-qualifier, if any.
  SourceLocation getRefQualifierLoc() const { return RefQualifierLoc; }

  /// Retrieve the location of the 'const' qualifier.
  SourceLocation getConstQualifierLoc() const {
    assert(MethodQualifiers)(static_cast<void> (0));
    return MethodQualifiers->getConstSpecLoc();
  }

  /// Retrieve the location of the 'volatile' qualifier.
  SourceLocation getVolatileQualifierLoc() const {
    assert(MethodQualifiers)(static_cast<void> (0));
    return MethodQualifiers->getVolatileSpecLoc();
  }

  /// Retrieve the location of the 'restrict' qualifier.
  SourceLocation getRestrictQualifierLoc() const {
    assert(MethodQualifiers)(static_cast<void> (0));
    return MethodQualifiers->getRestrictSpecLoc();
  }

  /// Retrieve the location of the 'mutable' qualifier, if any.
  SourceLocation getMutableLoc() const { return MutableLoc; }

  /// Determine whether this function declaration contains a
  /// ref-qualifier.
  bool hasRefQualifier() const { return getRefQualifierLoc().isValid(); }

  /// Determine whether this lambda-declarator contains a 'mutable'
  /// qualifier.
  bool hasMutableQualifier() const { return getMutableLoc().isValid(); }

  /// Determine whether this method has qualifiers.
  bool hasMethodTypeQualifiers() const {
    return MethodQualifiers && (MethodQualifiers->getTypeQualifiers() ||
                                MethodQualifiers->getAttributes().size());
  }

  /// Get the type of exception specification this function has.
  ExceptionSpecificationType getExceptionSpecType() const {
    return static_cast<ExceptionSpecificationType>(ExceptionSpecType);
  }

  /// Get the number of dynamic exception specifications.
  unsigned getNumExceptions() const {
    assert(ExceptionSpecType != EST_None)(static_cast<void> (0));
    return NumExceptionsOrDecls;
  }

  /// Get the non-parameter decls defined within this function
  /// prototype. Typically these are tag declarations.
  ArrayRef<NamedDecl *> getDeclsInPrototype() const {
    assert(ExceptionSpecType == EST_None)(static_cast<void> (0));
    return llvm::makeArrayRef(DeclsInPrototype, NumExceptionsOrDecls);
  }

  /// Determine whether this function declarator had a
  /// trailing-return-type.
  bool hasTrailingReturnType() const { return HasTrailingReturnType; }

  /// Get the trailing-return-type for this function declarator.
  ParsedType getTrailingReturnType() const {
    assert(HasTrailingReturnType)(static_cast<void> (0));
    return TrailingReturnType;
  }

  /// Get the trailing-return-type location for this function declarator.
  SourceLocation getTrailingReturnTypeLoc() const {
    assert(HasTrailingReturnType)(static_cast<void> (0));
    return TrailingReturnTypeLoc;
  }
};

struct BlockPointerTypeInfo {
  /// For now, sema will catch these as invalid.
  /// The type qualifiers: const/volatile/restrict/__unaligned/_Atomic.
  unsigned TypeQuals : 5;

  void destroy() {
  }
};

struct MemberPointerTypeInfo {
  /// The type qualifiers: const/volatile/restrict/__unaligned/_Atomic.
  unsigned TypeQuals : 5;
  /// Location of the '*' token.
  SourceLocation StarLoc;
  // CXXScopeSpec has a constructor, so it can't be a direct member.
  // So we need some pointer-aligned storage and a bit of trickery.
  alignas(CXXScopeSpec) char ScopeMem[sizeof(CXXScopeSpec)];
  CXXScopeSpec &Scope() {
    return *reinterpret_cast<CXXScopeSpec *>(ScopeMem);
  }
  const CXXScopeSpec &Scope() const {
    return *reinterpret_cast<const CXXScopeSpec *>(ScopeMem);
  }
  void destroy() {
    Scope().~CXXScopeSpec();
  }
};

struct PipeTypeInfo {
  /// The access writes.
  unsigned AccessWrites : 3;

  void destroy() {}
};

union {
  PointerTypeInfo       Ptr;
  ReferenceTypeInfo     Ref;
  ArrayTypeInfo         Arr;
  FunctionTypeInfo      Fun;
  BlockPointerTypeInfo  Cls;
  MemberPointerTypeInfo Mem;
  PipeTypeInfo          PipeInfo;
};

void destroy() {
  switch (Kind) {
  case DeclaratorChunk::Function:      return Fun.destroy();
  case DeclaratorChunk::Pointer:       return Ptr.destroy();
  case DeclaratorChunk::BlockPointer:  return Cls.destroy();
  case DeclaratorChunk::Reference:     return Ref.destroy();
  case DeclaratorChunk::Array:         return Arr.destroy();
  case DeclaratorChunk::MemberPointer: return Mem.destroy();
  case DeclaratorChunk::Paren:         return;
  case DeclaratorChunk::Pipe:          return PipeInfo.destroy();
  }
}

/// If there are attributes applied to this declaratorchunk, return
/// them.
const ParsedAttributesView &getAttrs() const { return AttrList; }
ParsedAttributesView &getAttrs() { return AttrList; }

/// Return a DeclaratorChunk for a pointer.
static DeclaratorChunk getPointer(unsigned TypeQuals, SourceLocation Loc,
                                  SourceLocation ConstQualLoc,
                                  SourceLocation VolatileQualLoc,
                                  SourceLocation RestrictQualLoc,
                                  SourceLocation AtomicQualLoc,
                                  SourceLocation UnalignedQualLoc) {
  DeclaratorChunk I;
  I.Kind                = Pointer;
  I.Loc                 = Loc;
  new (&I.Ptr) PointerTypeInfo;
  I.Ptr.TypeQuals       = TypeQuals;
  I.Ptr.ConstQualLoc    = ConstQualLoc;
  I.Ptr.VolatileQualLoc = VolatileQualLoc;
  I.Ptr.RestrictQualLoc = RestrictQualLoc;
  I.Ptr.AtomicQualLoc   = AtomicQualLoc;
  I.Ptr.UnalignedQualLoc = UnalignedQualLoc;
  return I;
}

/// Return a DeclaratorChunk for a reference.
static DeclaratorChunk getReference(unsigned TypeQuals, SourceLocation Loc,
                                    bool lvalue) {
  DeclaratorChunk I;
  I.Kind            = Reference;
  I.Loc             = Loc;
  I.Ref.HasRestrict = (TypeQuals & DeclSpec::TQ_restrict) != 0;
  I.Ref.LValueRef   = lvalue;
  return I;
}

/// Return a DeclaratorChunk for an array.
static DeclaratorChunk getArray(unsigned TypeQuals,
                                bool isStatic, bool isStar, Expr *NumElts,
                                SourceLocation LBLoc, SourceLocation RBLoc) {
  DeclaratorChunk I;
  I.Kind          = Array;
  I.Loc           = LBLoc;
  I.EndLoc        = RBLoc;
  I.Arr.TypeQuals = TypeQuals;
  I.Arr.hasStatic = isStatic;
  I.Arr.isStar    = isStar;
  I.Arr.NumElts   = NumElts;
  return I;
}

/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
/// "TheDeclarator" is the declarator that this will be added to.
static DeclaratorChunk getFunction(bool HasProto,
                                   bool IsAmbiguous,
                                   SourceLocation LParenLoc,
                                   ParamInfo *Params, unsigned NumParams,
                                   SourceLocation EllipsisLoc,
                                   SourceLocation RParenLoc,
                                   bool RefQualifierIsLvalueRef,
                                   SourceLocation RefQualifierLoc,
                                   SourceLocation MutableLoc,
                                   ExceptionSpecificationType ESpecType,
                                   SourceRange ESpecRange,
                                   ParsedType *Exceptions,
                                   SourceRange *ExceptionRanges,
                                   unsigned NumExceptions,
                                   Expr *NoexceptExpr,
                                   CachedTokens *ExceptionSpecTokens,
                                   ArrayRef<NamedDecl *> DeclsInPrototype,
                                   SourceLocation LocalRangeBegin,
                                   SourceLocation LocalRangeEnd,
                                   Declarator &TheDeclarator,
                                   TypeResult TrailingReturnType =
                                                  TypeResult(),
                                   SourceLocation TrailingReturnTypeLoc =
                                                  SourceLocation(),
                                   DeclSpec *MethodQualifiers = nullptr);

/// Return a DeclaratorChunk for a block.
static DeclaratorChunk getBlockPointer(unsigned TypeQuals,
                                       SourceLocation Loc) {
  DeclaratorChunk I;
  I.Kind          = BlockPointer;
  I.Loc           = Loc;
  I.Cls.TypeQuals = TypeQuals;
  return I;
}

/// Return a DeclaratorChunk for a block.
static DeclaratorChunk getPipe(unsigned TypeQuals,
                               SourceLocation Loc) {
  DeclaratorChunk I;
  I.Kind          = Pipe;
  I.Loc           = Loc;
  I.Cls.TypeQuals = TypeQuals;
  return I;
}

static DeclaratorChunk getMemberPointer(const CXXScopeSpec &SS,
                                        unsigned TypeQuals,
                                        SourceLocation StarLoc,
                                        SourceLocation EndLoc) {
  DeclaratorChunk I;
  I.Kind          = MemberPointer;
  I.Loc           = SS.getBeginLoc();
  I.EndLoc = EndLoc;
  new (&I.Mem) MemberPointerTypeInfo;
  I.Mem.StarLoc = StarLoc;
  I.Mem.TypeQuals = TypeQuals;
  new (I.Mem.ScopeMem) CXXScopeSpec(SS);
  return I;
}

/// Return a DeclaratorChunk for a paren.
static DeclaratorChunk getParen(SourceLocation LParenLoc,
                                SourceLocation RParenLoc) {
  DeclaratorChunk I;
  I.Kind          = Paren;
  I.Loc           = LParenLoc;
  I.EndLoc        = RParenLoc;
  return I;
}

bool isParen() const {
  return Kind == Paren;
}
1698};

1700/// A parsed C++17 decomposition declarator of the form
1701///   '[' identifier-list ']'
1702class DecompositionDeclarator {
1703public:
struct Binding {
  IdentifierInfo *Name;
  SourceLocation NameLoc;
};

1709private:
/// The locations of the '[' and ']' tokens.
SourceLocation LSquareLoc, RSquareLoc;

/// The bindings.
Binding *Bindings;
unsigned NumBindings : 31;
unsigned DeleteBindings : 1;

friend class Declarator;

1720public:
DecompositionDeclarator()
    : Bindings(nullptr), NumBindings(0), DeleteBindings(false) {}
DecompositionDeclarator(const DecompositionDeclarator &G) = delete;
DecompositionDeclarator &operator=(const DecompositionDeclarator &G) = delete;
~DecompositionDeclarator() {
  if (DeleteBindings)
    delete[] Bindings;
}

void clear() {
  LSquareLoc = RSquareLoc = SourceLocation();
  if (DeleteBindings)
    delete[] Bindings;
  Bindings = nullptr;
  NumBindings = 0;
  DeleteBindings = false;
}

ArrayRef<Binding> bindings() const {
  return llvm::makeArrayRef(Bindings, NumBindings);
}

bool isSet() const { return LSquareLoc.isValid(); }

SourceLocation getLSquareLoc() const { return LSquareLoc; }
SourceLocation getRSquareLoc() const { return RSquareLoc; }
SourceRange getSourceRange() const {
  return SourceRange(LSquareLoc, RSquareLoc);
}
1750};

1752/// Described the kind of function definition (if any) provided for
1753/// a function.
1754enum class FunctionDefinitionKind {
Declaration,
Definition,
Defaulted,
Deleted
1759};

1761enum class DeclaratorContext {
File,                // File scope declaration.
Prototype,           // Within a function prototype.
ObjCResult,          // An ObjC method result type.
ObjCParameter,       // An ObjC method parameter type.
KNRTypeList,         // K&R type definition list for formals.
TypeName,            // Abstract declarator for types.
FunctionalCast,      // Type in a C++ functional cast expression.
Member,              // Struct/Union field.
Block,               // Declaration within a block in a function.
ForInit,             // Declaration within first part of a for loop.
SelectionInit,       // Declaration within optional init stmt of if/switch.
Condition,           // Condition declaration in a C++ if/switch/while/for.
TemplateParam,       // Within a template parameter list.
CXXNew,              // C++ new-expression.
CXXCatch,            // C++ catch exception-declaration
ObjCCatch,           // Objective-C catch exception-declaration
BlockLiteral,        // Block literal declarator.
LambdaExpr,          // Lambda-expression declarator.
LambdaExprParameter, // Lambda-expression parameter declarator.
ConversionId,        // C++ conversion-type-id.
TrailingReturn,      // C++11 trailing-type-specifier.
TrailingReturnVar,   // C++11 trailing-type-specifier for variable.
TemplateArg,         // Any template argument (in template argument list).
TemplateTypeArg,     // Template type argument (in default argument).
AliasDecl,           // C++11 alias-declaration.
AliasTemplate,       // C++11 alias-declaration template.
RequiresExpr         // C++2a requires-expression.
1789};

1791/// Information about one declarator, including the parsed type
1792/// information and the identifier.
1793///
1794/// When the declarator is fully formed, this is turned into the appropriate
1795/// Decl object.
1796///
1797/// Declarators come in two types: normal declarators and abstract declarators.
1798/// Abstract declarators are used when parsing types, and don't have an
1799/// identifier.  Normal declarators do have ID's.
1800///
1801/// Instances of this class should be a transient object that lives on the
1802/// stack, not objects that are allocated in large quantities on the heap.
1803class Declarator {

1805private:
const DeclSpec &DS;
CXXScopeSpec SS;
UnqualifiedId Name;
SourceRange Range;

/// Where we are parsing this declarator.
DeclaratorContext Context;

/// The C++17 structured binding, if any. This is an alternative to a Name.
DecompositionDeclarator BindingGroup;

/// DeclTypeInfo - This holds each type that the declarator includes as it is
/// parsed.  This is pushed from the identifier out, which means that element
/// #0 will be the most closely bound to the identifier, and
/// DeclTypeInfo.back() will be the least closely bound.
SmallVector<DeclaratorChunk, 8> DeclTypeInfo;

/// InvalidType - Set by Sema::GetTypeForDeclarator().
unsigned InvalidType : 1;

/// GroupingParens - Set by Parser::ParseParenDeclarator().
unsigned GroupingParens : 1;

/// FunctionDefinition - Is this Declarator for a function or member
/// definition and, if so, what kind?
///
/// Actually a FunctionDefinitionKind.
unsigned FunctionDefinition : 2;

/// Is this Declarator a redeclaration?
unsigned Redeclaration : 1;

/// true if the declaration is preceded by \c __extension__.
unsigned Extension : 1;

/// Indicates whether this is an Objective-C instance variable.
unsigned ObjCIvar : 1;

/// Indicates whether this is an Objective-C 'weak' property.
unsigned ObjCWeakProperty : 1;

/// Indicates whether the InlineParams / InlineBindings storage has been used.
unsigned InlineStorageUsed : 1;

/// Indicates whether this declarator has an initializer.
unsigned HasInitializer : 1;

/// Attrs - Attributes.
ParsedAttributes Attrs;

/// The asm label, if specified.
Expr *AsmLabel;

/// \brief The constraint-expression specified by the trailing
/// requires-clause, or null if no such clause was specified.
Expr *TrailingRequiresClause;

/// If this declarator declares a template, its template parameter lists.
ArrayRef<TemplateParameterList *> TemplateParameterLists;

/// If the declarator declares an abbreviated function template, the innermost
/// template parameter list containing the invented and explicit template
/// parameters (if any).
TemplateParameterList *InventedTemplateParameterList;

1871#ifndef _MSC_VER
union {
1873#endif
  /// InlineParams - This is a local array used for the first function decl
  /// chunk to avoid going to the heap for the common case when we have one
  /// function chunk in the declarator.
  DeclaratorChunk::ParamInfo InlineParams[16];
  DecompositionDeclarator::Binding InlineBindings[16];
1879#ifndef _MSC_VER
};
1881#endif

/// If this is the second or subsequent declarator in this declaration,
/// the location of the comma before this declarator.
SourceLocation CommaLoc;

/// If provided, the source location of the ellipsis used to describe
/// this declarator as a parameter pack.
SourceLocation EllipsisLoc;

friend struct DeclaratorChunk;

1893public:
Declarator(const DeclSpec &ds, DeclaratorContext C)
    : DS(ds), Range(ds.getSourceRange()), Context(C),
      InvalidType(DS.getTypeSpecType() == DeclSpec::TST_error),
      GroupingParens(false), FunctionDefinition(static_cast<unsigned>(
                                 FunctionDefinitionKind::Declaration)),
      Redeclaration(false), Extension(false), ObjCIvar(false),
      ObjCWeakProperty(false), InlineStorageUsed(false),
      HasInitializer(false), Attrs(ds.getAttributePool().getFactory()),
      AsmLabel(nullptr), TrailingRequiresClause(nullptr),
      InventedTemplateParameterList(nullptr) {}

~Declarator() {
  clear();
}
/// getDeclSpec - Return the declaration-specifier that this declarator was
/// declared with.
const DeclSpec &getDeclSpec() const { return DS; }

/// getMutableDeclSpec - Return a non-const version of the DeclSpec.  This
/// should be used with extreme care: declspecs can often be shared between
/// multiple declarators, so mutating the DeclSpec affects all of the
/// Declarators.  This should only be done when the declspec is known to not
/// be shared or when in error recovery etc.
DeclSpec &getMutableDeclSpec() { return const_cast<DeclSpec &>(DS); }

AttributePool &getAttributePool() const {
  return Attrs.getPool();
}

/// getCXXScopeSpec - Return the C++ scope specifier (global scope or
/// nested-name-specifier) that is part of the declarator-id.
const CXXScopeSpec &getCXXScopeSpec() const { return SS; }
CXXScopeSpec &getCXXScopeSpec() { return SS; }

/// Retrieve the name specified by this declarator.
UnqualifiedId &getName() { return Name; }

const DecompositionDeclarator &getDecompositionDeclarator() const {
  return BindingGroup;
}

DeclaratorContext getContext() const { return Context; }

bool isPrototypeContext() const {
  return (Context == DeclaratorContext::Prototype ||
          Context == DeclaratorContext::ObjCParameter ||
          Context == DeclaratorContext::ObjCResult ||
          Context == DeclaratorContext::LambdaExprParameter);
}

/// Get the source range that spans this declarator.
SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) { return Range; }
SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getBegin(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getEnd(); }

void SetSourceRange(SourceRange R) { Range = R; }
/// SetRangeBegin - Set the start of the source range to Loc, unless it's
/// invalid.
void SetRangeBegin(SourceLocation Loc) {
  if (!Loc.isInvalid())
    Range.setBegin(Loc);
}
/// SetRangeEnd - Set the end of the source range to Loc, unless it's invalid.
void SetRangeEnd(SourceLocation Loc) {
  if (!Loc.isInvalid())
    Range.setEnd(Loc);
}
/// ExtendWithDeclSpec - Extend the declarator source range to include the
/// given declspec, unless its location is invalid. Adopts the range start if
/// the current range start is invalid.
void ExtendWithDeclSpec(const DeclSpec &DS) {
  SourceRange SR = DS.getSourceRange();
  if (Range.getBegin().isInvalid())
    Range.setBegin(SR.getBegin());
  if (!SR.getEnd().isInvalid())
    Range.setEnd(SR.getEnd());
}

/// Reset the contents of this Declarator.
void clear() {
  SS.clear();
  Name.clear();
  Range = DS.getSourceRange();
  BindingGroup.clear();

  for (unsigned i = 0, e = DeclTypeInfo.size(); i != e; ++i)
    DeclTypeInfo[i].destroy();
  DeclTypeInfo.clear();
  Attrs.clear();
  AsmLabel = nullptr;
  InlineStorageUsed = false;
  HasInitializer = false;
  ObjCIvar = false;
  ObjCWeakProperty = false;
  CommaLoc = SourceLocation();
  EllipsisLoc = SourceLocation();
}

/// mayOmitIdentifier - Return true if the identifier is either optional or
/// not allowed.  This is true for typenames, prototypes, and template
/// parameter lists.
bool mayOmitIdentifier() const {
  switch (Context) {
  case DeclaratorContext::File:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::Member:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
    return false;

  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
  case DeclaratorContext::RequiresExpr:
    return true;
  }
  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// mayHaveIdentifier - Return true if the identifier is either optional or
/// required.  This is true for normal declarators and prototypes, but not
/// typenames.
bool mayHaveIdentifier() const {
  switch (Context) {
  case DeclaratorContext::File:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::Member:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::RequiresExpr:
    return true;

  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
    return false;
  }
  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// Return true if the context permits a C++17 decomposition declarator.
bool mayHaveDecompositionDeclarator() const {
  switch (Context) {
  case DeclaratorContext::File:
    // FIXME: It's not clear that the proposal meant to allow file-scope
    // structured bindings, but it does.
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
    return true;

  case DeclaratorContext::Member:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::RequiresExpr:
    // Maybe one day...
    return false;

  // These contexts don't allow any kind of non-abstract declarator.
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
    return false;
  }
  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// mayBeFollowedByCXXDirectInit - Return true if the declarator can be
/// followed by a C++ direct initializer, e.g. "int x(1);".
bool mayBeFollowedByCXXDirectInit() const {
  if (hasGroupingParens()) return false;

  if (getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
    return false;

  if (getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern &&
      Context != DeclaratorContext::File)
    return false;

  // Special names can't have direct initializers.
  if (Name.getKind() != UnqualifiedIdKind::IK_Identifier)
    return false;

  switch (Context) {
  case DeclaratorContext::File:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::TrailingReturnVar:
    return true;

  case DeclaratorContext::Condition:
    // This may not be followed by a direct initializer, but it can't be a
    // function declaration either, and we'd prefer to perform a tentative
    // parse in order to produce the right diagnostic.
    return true;

  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::Member:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast: // FIXME
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::RequiresExpr:
    return false;
  }
  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// isPastIdentifier - Return true if we have parsed beyond the point where
/// the name would appear. (This may happen even if we haven't actually parsed
/// a name, perhaps because this context doesn't require one.)
bool isPastIdentifier() const { return Name.isValid(); }

/// hasName - Whether this declarator has a name, which might be an
/// identifier (accessible via getIdentifier()) or some kind of
/// special C++ name (constructor, destructor, etc.), or a structured
/// binding (which is not exactly a name, but occupies the same position).
bool hasName() const {
  return Name.getKind() != UnqualifiedIdKind::IK_Identifier ||
         Name.Identifier || isDecompositionDeclarator();
}

/// Return whether this declarator is a decomposition declarator.
bool isDecompositionDeclarator() const {
  return BindingGroup.isSet();
}

IdentifierInfo *getIdentifier() const {
  if (Name.getKind() == UnqualifiedIdKind::IK_Identifier)
    return Name.Identifier;

  return nullptr;
}
SourceLocation getIdentifierLoc() const { return Name.StartLocation; }

/// Set the name of this declarator to be the given identifier.
void SetIdentifier(IdentifierInfo *Id, SourceLocation IdLoc) {
  Name.setIdentifier(Id, IdLoc);
}

/// Set the decomposition bindings for this declarator.
void
setDecompositionBindings(SourceLocation LSquareLoc,
                         ArrayRef<DecompositionDeclarator::Binding> Bindings,
                         SourceLocation RSquareLoc);

/// AddTypeInfo - Add a chunk to this declarator. Also extend the range to
/// EndLoc, which should be the last token of the chunk.
/// This function takes attrs by R-Value reference because it takes ownership
/// of those attributes from the parameter.
void AddTypeInfo(const DeclaratorChunk &TI, ParsedAttributes &&attrs,
                 SourceLocation EndLoc) {
  DeclTypeInfo.push_back(TI);
  DeclTypeInfo.back().getAttrs().addAll(attrs.begin(), attrs.end());
  getAttributePool().takeAllFrom(attrs.getPool());

  if (!EndLoc.isInvalid())
    SetRangeEnd(EndLoc);
}

/// AddTypeInfo - Add a chunk to this declarator. Also extend the range to
/// EndLoc, which should be the last token of the chunk.
void AddTypeInfo(const DeclaratorChunk &TI, SourceLocation EndLoc) {
  DeclTypeInfo.push_back(TI);

  if (!EndLoc.isInvalid())
    SetRangeEnd(EndLoc);
}

/// Add a new innermost chunk to this declarator.
void AddInnermostTypeInfo(const DeclaratorChunk &TI) {
  DeclTypeInfo.insert(DeclTypeInfo.begin(), TI);
}

/// Return the number of types applied to this declarator.
unsigned getNumTypeObjects() const { return DeclTypeInfo.size(); }

/// Return the specified TypeInfo from this declarator.  TypeInfo #0 is
/// closest to the identifier.
const DeclaratorChunk &getTypeObject(unsigned i) const {
  assert(i < DeclTypeInfo.size() && "Invalid type chunk")(static_cast<void> (0));
  return DeclTypeInfo[i];
}
DeclaratorChunk &getTypeObject(unsigned i) {
  assert(i < DeclTypeInfo.size() && "Invalid type chunk")(static_cast<void> (0));
  return DeclTypeInfo[i];
}

typedef SmallVectorImpl<DeclaratorChunk>::const_iterator type_object_iterator;
typedef llvm::iterator_range<type_object_iterator> type_object_range;

/// Returns the range of type objects, from the identifier outwards.
type_object_range type_objects() const {
  return type_object_range(DeclTypeInfo.begin(), DeclTypeInfo.end());
}

void DropFirstTypeObject() {
  assert(!DeclTypeInfo.empty() && "No type chunks to drop.")(static_cast<void> (0));
  DeclTypeInfo.front().destroy();
  DeclTypeInfo.erase(DeclTypeInfo.begin());
}

/// Return the innermost (closest to the declarator) chunk of this
/// declarator that is not a parens chunk, or null if there are no
/// non-parens chunks.
const DeclaratorChunk *getInnermostNonParenChunk() const {
  for (unsigned i = 0, i_end = DeclTypeInfo.size(); i < i_end; ++i) {
    if (!DeclTypeInfo[i].isParen())
      return &DeclTypeInfo[i];
  }
  return nullptr;
}

/// Return the outermost (furthest from the declarator) chunk of
/// this declarator that is not a parens chunk, or null if there are
/// no non-parens chunks.
const DeclaratorChunk *getOutermostNonParenChunk() const {
  for (unsigned i = DeclTypeInfo.size(), i_end = 0; i != i_end; --i) {
    if (!DeclTypeInfo[i-1].isParen())
      return &DeclTypeInfo[i-1];
  }
  return nullptr;
}

/// isArrayOfUnknownBound - This method returns true if the declarator
/// is a declarator for an array of unknown bound (looking through
/// parentheses).
bool isArrayOfUnknownBound() const {
  const DeclaratorChunk *chunk = getInnermostNonParenChunk();
  return (chunk && chunk->Kind == DeclaratorChunk::Array &&
          !chunk->Arr.NumElts);
}

/// isFunctionDeclarator - This method returns true if the declarator
/// is a function declarator (looking through parentheses).
/// If true is returned, then the reference type parameter idx is
/// assigned with the index of the declaration chunk.
bool isFunctionDeclarator(unsigned& idx) const {
  for (unsigned i = 0, i_end = DeclTypeInfo.size(); i < i_end; ++i) {
    switch (DeclTypeInfo[i].Kind) {
    case DeclaratorChunk::Function:
      idx = i;
      return true;
    case DeclaratorChunk::Paren:
      continue;
    case DeclaratorChunk::Pointer:
    case DeclaratorChunk::Reference:
    case DeclaratorChunk::Array:
    case DeclaratorChunk::BlockPointer:
    case DeclaratorChunk::MemberPointer:
    case DeclaratorChunk::Pipe:
      return false;
    }
    llvm_unreachable("Invalid type chunk")__builtin_unreachable();
  }
  return false;
}

/// isFunctionDeclarator - Once this declarator is fully parsed and formed,
/// this method returns true if the identifier is a function declarator
/// (looking through parentheses).
bool isFunctionDeclarator() const {
  unsigned index;
  return isFunctionDeclarator(index);
}

/// getFunctionTypeInfo - Retrieves the function type info object
/// (looking through parentheses).
DeclaratorChunk::FunctionTypeInfo &getFunctionTypeInfo() {
  assert(isFunctionDeclarator() && "Not a function declarator!")(static_cast<void> (0));
  unsigned index = 0;
  isFunctionDeclarator(index);
  return DeclTypeInfo[index].Fun;
}

/// getFunctionTypeInfo - Retrieves the function type info object
/// (looking through parentheses).
const DeclaratorChunk::FunctionTypeInfo &getFunctionTypeInfo() const {
  return const_cast<Declarator*>(this)->getFunctionTypeInfo();
}

/// Determine whether the declaration that will be produced from
/// this declaration will be a function.
///
/// A declaration can declare a function even if the declarator itself
/// isn't a function declarator, if the type specifier refers to a function
/// type. This routine checks for both cases.
bool isDeclarationOfFunction() const;

/// Return true if this declaration appears in a context where a
/// function declarator would be a function declaration.
bool isFunctionDeclarationContext() const {
  if (getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
    return false;

  switch (Context) {
  case DeclaratorContext::File:
  case DeclaratorContext::Member:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
    return true;

  case DeclaratorContext::Condition:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
  case DeclaratorContext::RequiresExpr:
    return false;
  }
  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// Determine whether this declaration appears in a context where an
/// expression could appear.
bool isExpressionContext() const {
  switch (Context) {
  case DeclaratorContext::File:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::Member:

  // FIXME: sizeof(...) permits an expression.
  case DeclaratorContext::TypeName:

  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::RequiresExpr:
    return false;

  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
  case DeclaratorContext::TemplateArg:
    return true;
  }

  llvm_unreachable("unknown context kind!")__builtin_unreachable();
}

/// Return true if a function declarator at this position would be a
/// function declaration.
bool isFunctionDeclaratorAFunctionDeclaration() const {
  if (!isFunctionDeclarationContext())
    return false;

  for (unsigned I = 0, N = getNumTypeObjects(); I != N; ++I)
    if (getTypeObject(I).Kind != DeclaratorChunk::Paren)
      return false;

  return true;
}

/// Determine whether a trailing return type was written (at any
/// level) within this declarator.
bool hasTrailingReturnType() const {
  for (const auto &Chunk : type_objects())
    if (Chunk.Kind == DeclaratorChunk::Function &&
        Chunk.Fun.hasTrailingReturnType())
      return true;
  return false;
}
/// Get the trailing return type appearing (at any level) within this
/// declarator.
ParsedType getTrailingReturnType() const {
  for (const auto &Chunk : type_objects())
    if (Chunk.Kind == DeclaratorChunk::Function &&
        Chunk.Fun.hasTrailingReturnType())
      return Chunk.Fun.getTrailingReturnType();
  return ParsedType();
}

/// \brief Sets a trailing requires clause for this declarator.
void setTrailingRequiresClause(Expr *TRC) {
  TrailingRequiresClause = TRC;

  SetRangeEnd(TRC->getEndLoc());
}

/// \brief Sets a trailing requires clause for this declarator.
Expr *getTrailingRequiresClause() {
  return TrailingRequiresClause;
}

/// \brief Determine whether a trailing requires clause was written in this
/// declarator.
bool hasTrailingRequiresClause() const {
  return TrailingRequiresClause != nullptr;
}

/// Sets the template parameter lists that preceded the declarator.
void setTemplateParameterLists(ArrayRef<TemplateParameterList *> TPLs) {
  TemplateParameterLists = TPLs;
}

/// The template parameter lists that preceded the declarator.
ArrayRef<TemplateParameterList *> getTemplateParameterLists() const {
  return TemplateParameterLists;
}

/// Sets the template parameter list generated from the explicit template
/// parameters along with any invented template parameters from
/// placeholder-typed parameters.
void setInventedTemplateParameterList(TemplateParameterList *Invented) {
  InventedTemplateParameterList = Invented;
}

/// The template parameter list generated from the explicit template
/// parameters along with any invented template parameters from
/// placeholder-typed parameters, if there were any such parameters.
TemplateParameterList * getInventedTemplateParameterList() const {
  return InventedTemplateParameterList;
}

/// takeAttributes - Takes attributes from the given parsed-attributes
/// set and add them to this declarator.
///
/// These examples both add 3 attributes to "var":
///  short int var __attribute__((aligned(16),common,deprecated));
///  short int x, __attribute__((aligned(16)) var
///                                 __attribute__((common,deprecated));
///
/// Also extends the range of the declarator.
void takeAttributes(ParsedAttributes &attrs, SourceLocation lastLoc) {
  Attrs.takeAllFrom(attrs);

  if (!lastLoc.isInvalid())
    SetRangeEnd(lastLoc);
}

const ParsedAttributes &getAttributes() const { return Attrs; }
ParsedAttributes &getAttributes() { return Attrs; }

/// hasAttributes - do we contain any attributes?
bool hasAttributes() const {
  if (!getAttributes().empty() || getDeclSpec().hasAttributes())
    return true;
  for (unsigned i = 0, e = getNumTypeObjects(); i != e; ++i)
    if (!getTypeObject(i).getAttrs().empty())
      return true;
  return false;
}

/// Return a source range list of C++11 attributes associated
/// with the declarator.
void getCXX11AttributeRanges(SmallVectorImpl<SourceRange> &Ranges) {
  for (const ParsedAttr &AL : Attrs)
    if (AL.isCXX11Attribute())
      Ranges.push_back(AL.getRange());
}

void setAsmLabel(Expr *E) { AsmLabel = E; }
Expr *getAsmLabel() const { return AsmLabel; }

void setExtension(bool Val = true) { Extension = Val; }
bool getExtension() const { return Extension; }

void setObjCIvar(bool Val = true) { ObjCIvar = Val; }
bool isObjCIvar() const { return ObjCIvar; }

void setObjCWeakProperty(bool Val = true) { ObjCWeakProperty = Val; }
bool isObjCWeakProperty() const { return ObjCWeakProperty; }

void setInvalidType(bool Val = true) { InvalidType = Val; }
bool isInvalidType() const {
  return InvalidType || DS.getTypeSpecType() == DeclSpec::TST_error;
}

void setGroupingParens(bool flag) { GroupingParens = flag; }
bool hasGroupingParens() const { return GroupingParens; }

bool isFirstDeclarator() const { return !CommaLoc.isValid(); }
SourceLocation getCommaLoc() const { return CommaLoc; }
void setCommaLoc(SourceLocation CL) { CommaLoc = CL; }

bool hasEllipsis() const { return EllipsisLoc.isValid(); }
SourceLocation getEllipsisLoc() const { return EllipsisLoc; }
void setEllipsisLoc(SourceLocation EL) { EllipsisLoc = EL; }

void setFunctionDefinitionKind(FunctionDefinitionKind Val) {
  FunctionDefinition = static_cast<unsigned>(Val);
}

bool isFunctionDefinition() const {
  return getFunctionDefinitionKind() != FunctionDefinitionKind::Declaration;
}

FunctionDefinitionKind getFunctionDefinitionKind() const {
  return (FunctionDefinitionKind)FunctionDefinition;
}

void setHasInitializer(bool Val = true) { HasInitializer = Val; }
bool hasInitializer() const { return HasInitializer; }

/// Returns true if this declares a real member and not a friend.
bool isFirstDeclarationOfMember() {
  return getContext() == DeclaratorContext::Member &&
         !getDeclSpec().isFriendSpecified();
}

/// Returns true if this declares a static member.  This cannot be called on a
/// declarator outside of a MemberContext because we won't know until
/// redeclaration time if the decl is static.
bool isStaticMember();

/// Returns true if this declares a constructor or a destructor.
bool isCtorOrDtor();

void setRedeclaration(bool Val) { Redeclaration = Val; }
bool isRedeclaration() const { return Redeclaration; }
2603};

2605/// This little struct is used to capture information about
2606/// structure field declarators, which is basically just a bitfield size.
2607struct FieldDeclarator {
Declarator D;
Expr *BitfieldSize;
explicit FieldDeclarator(const DeclSpec &DS)
    : D(DS, DeclaratorContext::Member), BitfieldSize(nullptr) {}
2612};

2614/// Represents a C++11 virt-specifier-seq.
2615class VirtSpecifiers {
2616public:
enum Specifier {
  VS_None = 0,
  VS_Override = 1,
  VS_Final = 2,
  VS_Sealed = 4,
  // Represents the __final keyword, which is legal for gcc in pre-C++11 mode.
  VS_GNU_Final = 8,
  VS_Abstract = 16
};

VirtSpecifiers() : Specifiers(0), LastSpecifier(VS_None) { }

bool SetSpecifier(Specifier VS, SourceLocation Loc,
                  const char *&PrevSpec);

bool isUnset() const { return Specifiers == 0; }

bool isOverrideSpecified() const { return Specifiers & VS_Override; }
SourceLocation getOverrideLoc() const { return VS_overrideLoc; }

bool isFinalSpecified() const { return Specifiers & (VS_Final | VS_Sealed | VS_GNU_Final); }
bool isFinalSpelledSealed() const { return Specifiers & VS_Sealed; }
SourceLocation getFinalLoc() const { return VS_finalLoc; }
SourceLocation getAbstractLoc() const { return VS_abstractLoc; }

void clear() { Specifiers = 0; }

static const char *getSpecifierName(Specifier VS);

SourceLocation getFirstLocation() const { return FirstLocation; }
SourceLocation getLastLocation() const { return LastLocation; }
Specifier getLastSpecifier() const { return LastSpecifier; }

2650private:
unsigned Specifiers;
Specifier LastSpecifier;

SourceLocation VS_overrideLoc, VS_finalLoc, VS_abstractLoc;
SourceLocation FirstLocation;
SourceLocation LastLocation;
2657};

2659enum class LambdaCaptureInitKind {
NoInit,     //!< [a]
CopyInit,   //!< [a = b], [a = {b}]
DirectInit, //!< [a(b)]
ListInit    //!< [a{b}]
2664};

2666/// Represents a complete lambda introducer.
2667struct LambdaIntroducer {
/// An individual capture in a lambda introducer.
struct LambdaCapture {
  LambdaCaptureKind Kind;
  SourceLocation Loc;
  IdentifierInfo *Id;
  SourceLocation EllipsisLoc;
  LambdaCaptureInitKind InitKind;
  ExprResult Init;
  ParsedType InitCaptureType;
  SourceRange ExplicitRange;

  LambdaCapture(LambdaCaptureKind Kind, SourceLocation Loc,
                IdentifierInfo *Id, SourceLocation EllipsisLoc,
                LambdaCaptureInitKind InitKind, ExprResult Init,
                ParsedType InitCaptureType,
                SourceRange ExplicitRange)
      : Kind(Kind), Loc(Loc), Id(Id), EllipsisLoc(EllipsisLoc),
        InitKind(InitKind), Init(Init), InitCaptureType(InitCaptureType),
        ExplicitRange(ExplicitRange) {}
};

SourceRange Range;
SourceLocation DefaultLoc;
LambdaCaptureDefault Default;
SmallVector<LambdaCapture, 4> Captures;

LambdaIntroducer()
  : Default(LCD_None) {}

/// Append a capture in a lambda introducer.
void addCapture(LambdaCaptureKind Kind,
                SourceLocation Loc,
                IdentifierInfo* Id,
                SourceLocation EllipsisLoc,
                LambdaCaptureInitKind InitKind,
                ExprResult Init,
                ParsedType InitCaptureType,
                SourceRange ExplicitRange) {
  Captures.push_back(LambdaCapture(Kind, Loc, Id, EllipsisLoc, InitKind, Init,
                                   InitCaptureType, ExplicitRange));
}
2709};

2711struct InventedTemplateParameterInfo {
/// The number of parameters in the template parameter list that were
/// explicitly specified by the user, as opposed to being invented by use
/// of an auto parameter.
unsigned NumExplicitTemplateParams = 0;

/// If this is a generic lambda or abbreviated function template, use this
/// as the depth of each 'auto' parameter, during initial AST construction.
unsigned AutoTemplateParameterDepth = 0;

/// Store the list of the template parameters for a generic lambda or an
/// abbreviated function template.
/// If this is a generic lambda or abbreviated function template, this holds
/// the explicit template parameters followed by the auto parameters
/// converted into TemplateTypeParmDecls.
/// It can be used to construct the generic lambda or abbreviated template's
/// template parameter list during initial AST construction.
SmallVector<NamedDecl*, 4> TemplateParams;
2729};

2731} // end namespace clang

2733#endif // LLVM_CLANG_SEMA_DECLSPEC_H