/build/source/clang/lib/Lex/Pragma.cpp

Bug Summary

File:	build/source/clang/lib/Lex/Pragma.cpp
Warning:	line 1128, column 7 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name Pragma.cpp -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 -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/source/build-llvm -resource-dir /usr/lib/llvm-17/lib/clang/17 -D _DEBUG -D _GLIBCXX_ASSERTIONS -D _GNU_SOURCE -D _LIBCPP_ENABLE_ASSERTIONS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Lex -I /build/source/clang/lib/Lex -I /build/source/clang/include -I tools/clang/include -I include -I /build/source/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U 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-17/lib/clang/17/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 -fmacro-prefix-map=/build/source/build-llvm=build-llvm -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm=build-llvm -fcoverage-prefix-map=/build/source/= -source-date-epoch 1679443490 -O3 -Wno-unused-command-line-argument -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 -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/source/build-llvm -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -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-2023-03-22-005342-16304-1 -x c++ /build/source/clang/lib/Lex/Pragma.cpp
1//===- Pragma.cpp - Pragma registration and handling ----------------------===//
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 PragmaHandler/PragmaTable interfaces and implements
10// pragma related methods of the Preprocessor class.
11//
12//===----------------------------------------------------------------------===//

14#include "clang/Lex/Pragma.h"
15#include "clang/Basic/CLWarnings.h"
16#include "clang/Basic/Diagnostic.h"
17#include "clang/Basic/FileManager.h"
18#include "clang/Basic/IdentifierTable.h"
19#include "clang/Basic/LLVM.h"
20#include "clang/Basic/LangOptions.h"
21#include "clang/Basic/Module.h"
22#include "clang/Basic/SourceLocation.h"
23#include "clang/Basic/SourceManager.h"
24#include "clang/Basic/TokenKinds.h"
25#include "clang/Lex/HeaderSearch.h"
26#include "clang/Lex/LexDiagnostic.h"
27#include "clang/Lex/Lexer.h"
28#include "clang/Lex/LiteralSupport.h"
29#include "clang/Lex/MacroInfo.h"
30#include "clang/Lex/ModuleLoader.h"
31#include "clang/Lex/PPCallbacks.h"
32#include "clang/Lex/Preprocessor.h"
33#include "clang/Lex/PreprocessorLexer.h"
34#include "clang/Lex/PreprocessorOptions.h"
35#include "clang/Lex/Token.h"
36#include "clang/Lex/TokenLexer.h"
37#include "llvm/ADT/ArrayRef.h"
38#include "llvm/ADT/DenseMap.h"
39#include "llvm/ADT/STLExtras.h"
40#include "llvm/ADT/SmallString.h"
41#include "llvm/ADT/SmallVector.h"
42#include "llvm/ADT/StringRef.h"
43#include "llvm/Support/Compiler.h"
44#include "llvm/Support/ErrorHandling.h"
45#include "llvm/Support/Timer.h"
46#include <algorithm>
47#include <cassert>
48#include <cstddef>
49#include <cstdint>
50#include <limits>
51#include <optional>
52#include <string>
53#include <utility>
54#include <vector>

56using namespace clang;

58// Out-of-line destructor to provide a home for the class.
59PragmaHandler::~PragmaHandler() = default;

61//===----------------------------------------------------------------------===//
62// EmptyPragmaHandler Implementation.
63//===----------------------------------------------------------------------===//

65EmptyPragmaHandler::EmptyPragmaHandler(StringRef Name) : PragmaHandler(Name) {}

67void EmptyPragmaHandler::HandlePragma(Preprocessor &PP,
                                    PragmaIntroducer Introducer,
                                    Token &FirstToken) {}

71//===----------------------------------------------------------------------===//
72// PragmaNamespace Implementation.
73//===----------------------------------------------------------------------===//

75/// FindHandler - Check to see if there is already a handler for the
76/// specified name.  If not, return the handler for the null identifier if it
77/// exists, otherwise return null.  If IgnoreNull is true (the default) then
78/// the null handler isn't returned on failure to match.
79PragmaHandler *PragmaNamespace::FindHandler(StringRef Name,
                                          bool IgnoreNull) const {
auto I = Handlers.find(Name);
if (I != Handlers.end())
  return I->getValue().get();
if (IgnoreNull)
  return nullptr;
I = Handlers.find(StringRef());
if (I != Handlers.end())
  return I->getValue().get();
return nullptr;
90}

92void PragmaNamespace::AddPragma(PragmaHandler *Handler) {
assert(!Handlers.count(Handler->getName()) &&(static_cast <bool> (!Handlers.count(Handler->getName
()) && "A handler with this name is already registered in this namespace"
) ? void (0) : __assert_fail ("!Handlers.count(Handler->getName()) && \"A handler with this name is already registered in this namespace\""
, "clang/lib/Lex/Pragma.cpp", 94, __extension__ __PRETTY_FUNCTION__
))
       "A handler with this name is already registered in this namespace")(static_cast <bool> (!Handlers.count(Handler->getName
()) && "A handler with this name is already registered in this namespace"
) ? void (0) : __assert_fail ("!Handlers.count(Handler->getName()) && \"A handler with this name is already registered in this namespace\""
, "clang/lib/Lex/Pragma.cpp", 94, __extension__ __PRETTY_FUNCTION__
));
Handlers[Handler->getName()].reset(Handler);
96}

98void PragmaNamespace::RemovePragmaHandler(PragmaHandler *Handler) {
auto I = Handlers.find(Handler->getName());
assert(I != Handlers.end() &&(static_cast <bool> (I != Handlers.end() && "Handler not registered in this namespace"
) ? void (0) : __assert_fail ("I != Handlers.end() && \"Handler not registered in this namespace\""
, "clang/lib/Lex/Pragma.cpp", 101, __extension__ __PRETTY_FUNCTION__
))
       "Handler not registered in this namespace")(static_cast <bool> (I != Handlers.end() && "Handler not registered in this namespace"
) ? void (0) : __assert_fail ("I != Handlers.end() && \"Handler not registered in this namespace\""
, "clang/lib/Lex/Pragma.cpp", 101, __extension__ __PRETTY_FUNCTION__
));
// Release ownership back to the caller.
I->getValue().release();
Handlers.erase(I);
105}

107void PragmaNamespace::HandlePragma(Preprocessor &PP,
                                 PragmaIntroducer Introducer, Token &Tok) {
// Read the 'namespace' that the directive is in, e.g. STDC.  Do not macro
// expand it, the user can have a STDC #define, that should not affect this.
PP.LexUnexpandedToken(Tok);

// Get the handler for this token.  If there is no handler, ignore the pragma.
PragmaHandler *Handler
  = FindHandler(Tok.getIdentifierInfo() ? Tok.getIdentifierInfo()->getName()
                                        : StringRef(),
                /*IgnoreNull=*/false);
if (!Handler) {
  PP.Diag(Tok, diag::warn_pragma_ignored);
  return;
}

// Otherwise, pass it down.
Handler->HandlePragma(PP, Introducer, Tok);
125}

127//===----------------------------------------------------------------------===//
128// Preprocessor Pragma Directive Handling.
129//===----------------------------------------------------------------------===//

131namespace {
132// TokenCollector provides the option to collect tokens that were "read"
133// and return them to the stream to be read later.
134// Currently used when reading _Pragma/__pragma directives.
135struct TokenCollector {
Preprocessor &Self;
bool Collect;
SmallVector<Token, 3> Tokens;
Token &Tok;

void lex() {
  if (Collect)
    Tokens.push_back(Tok);
  Self.Lex(Tok);
}

void revert() {
  assert(Collect && "did not collect tokens")(static_cast <bool> (Collect && "did not collect tokens"
) ? void (0) : __assert_fail ("Collect && \"did not collect tokens\""
, "clang/lib/Lex/Pragma.cpp", 148, __extension__ __PRETTY_FUNCTION__
));
  assert(!Tokens.empty() && "collected unexpected number of tokens")(static_cast <bool> (!Tokens.empty() && "collected unexpected number of tokens"
) ? void (0) : __assert_fail ("!Tokens.empty() && \"collected unexpected number of tokens\""
, "clang/lib/Lex/Pragma.cpp", 149, __extension__ __PRETTY_FUNCTION__
));

  // Push the ( "string" ) tokens into the token stream.
  auto Toks = std::make_unique<Token[]>(Tokens.size());
  std::copy(Tokens.begin() + 1, Tokens.end(), Toks.get());
  Toks[Tokens.size() - 1] = Tok;
  Self.EnterTokenStream(std::move(Toks), Tokens.size(),
                        /*DisableMacroExpansion*/ true,
                        /*IsReinject*/ true);

  // ... and return the pragma token unchanged.
  Tok = *Tokens.begin();
}
162};
163} // namespace

165/// HandlePragmaDirective - The "\#pragma" directive has been parsed.  Lex the
166/// rest of the pragma, passing it to the registered pragma handlers.
167void Preprocessor::HandlePragmaDirective(PragmaIntroducer Introducer) {
if (Callbacks)
  Callbacks->PragmaDirective(Introducer.Loc, Introducer.Kind);

if (!PragmasEnabled)
  return;

++NumPragma;

// Invoke the first level of pragma handlers which reads the namespace id.
Token Tok;
PragmaHandlers->HandlePragma(*this, Introducer, Tok);

// If the pragma handler didn't read the rest of the line, consume it now.
if ((CurTokenLexer && CurTokenLexer->isParsingPreprocessorDirective())
 || (CurPPLexer && CurPPLexer->ParsingPreprocessorDirective))
  DiscardUntilEndOfDirective();
184}

186/// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then
187/// return the first token after the directive.  The _Pragma token has just
188/// been read into 'Tok'.
189void Preprocessor::Handle_Pragma(Token &Tok) {
// C11 6.10.3.4/3:
//   all pragma unary operator expressions within [a completely
//   macro-replaced preprocessing token sequence] are [...] processed [after
//   rescanning is complete]
//
// This means that we execute _Pragma operators in two cases:
//
//  1) on token sequences that would otherwise be produced as the output of
//     phase 4 of preprocessing, and
//  2) on token sequences formed as the macro-replaced token sequence of a
//     macro argument
//
// Case #2 appears to be a wording bug: only _Pragmas that would survive to
// the end of phase 4 should actually be executed. Discussion on the WG14
// mailing list suggests that a _Pragma operator is notionally checked early,
// but only pragmas that survive to the end of phase 4 should be executed.
//
// In Case #2, we check the syntax now, but then put the tokens back into the
// token stream for later consumption.

TokenCollector Toks = {*this, InMacroArgPreExpansion, {}, Tok};

// Remember the pragma token location.
SourceLocation PragmaLoc = Tok.getLocation();

// Read the '('.
Toks.lex();
if (Tok.isNot(tok::l_paren)) {
  Diag(PragmaLoc, diag::err__Pragma_malformed);
  return;
}

// Read the '"..."'.
Toks.lex();
if (!tok::isStringLiteral(Tok.getKind())) {
  Diag(PragmaLoc, diag::err__Pragma_malformed);
  // Skip bad tokens, and the ')', if present.
  if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::eof))
    Lex(Tok);
  while (Tok.isNot(tok::r_paren) &&
         !Tok.isAtStartOfLine() &&
         Tok.isNot(tok::eof))
    Lex(Tok);
  if (Tok.is(tok::r_paren))
    Lex(Tok);
  return;
}

if (Tok.hasUDSuffix()) {
  Diag(Tok, diag::err_invalid_string_udl);
  // Skip this token, and the ')', if present.
  Lex(Tok);
  if (Tok.is(tok::r_paren))
    Lex(Tok);
  return;
}

// Remember the string.
Token StrTok = Tok;

// Read the ')'.
Toks.lex();
if (Tok.isNot(tok::r_paren)) {
  Diag(PragmaLoc, diag::err__Pragma_malformed);
  return;
}

// If we're expanding a macro argument, put the tokens back.
if (InMacroArgPreExpansion) {
  Toks.revert();
  return;
}

SourceLocation RParenLoc = Tok.getLocation();
bool Invalid = false;
std::string StrVal = getSpelling(StrTok, &Invalid);
if (Invalid) {
  Diag(PragmaLoc, diag::err__Pragma_malformed);
  return;
}

// The _Pragma is lexically sound.  Destringize according to C11 6.10.9.1:
// "The string literal is destringized by deleting any encoding prefix,
// deleting the leading and trailing double-quotes, replacing each escape
// sequence \" by a double-quote, and replacing each escape sequence \\ by a
// single backslash."
if (StrVal[0] == 'L' || StrVal[0] == 'U' ||
    (StrVal[0] == 'u' && StrVal[1] != '8'))
  StrVal.erase(StrVal.begin());
else if (StrVal[0] == 'u')
  StrVal.erase(StrVal.begin(), StrVal.begin() + 2);

if (StrVal[0] == 'R') {
  // FIXME: C++11 does not specify how to handle raw-string-literals here.
  // We strip off the 'R', the quotes, the d-char-sequences, and the parens.
  assert(StrVal[1] == '"' && StrVal[StrVal.size() - 1] == '"' &&(static_cast <bool> (StrVal[1] == '"' && StrVal
[StrVal.size() - 1] == '"' && "Invalid raw string token!"
) ? void (0) : __assert_fail ("StrVal[1] == '\"' && StrVal[StrVal.size() - 1] == '\"' && \"Invalid raw string token!\""
, "clang/lib/Lex/Pragma.cpp", 286, __extension__ __PRETTY_FUNCTION__
))
         "Invalid raw string token!")(static_cast <bool> (StrVal[1] == '"' && StrVal
[StrVal.size() - 1] == '"' && "Invalid raw string token!"
) ? void (0) : __assert_fail ("StrVal[1] == '\"' && StrVal[StrVal.size() - 1] == '\"' && \"Invalid raw string token!\""
, "clang/lib/Lex/Pragma.cpp", 286, __extension__ __PRETTY_FUNCTION__
));

  // Measure the length of the d-char-sequence.
  unsigned NumDChars = 0;
  while (StrVal[2 + NumDChars] != '(') {
    assert(NumDChars < (StrVal.size() - 5) / 2 &&(static_cast <bool> (NumDChars < (StrVal.size() - 5)
 / 2 && "Invalid raw string token!") ? void (0) : __assert_fail
 ("NumDChars < (StrVal.size() - 5) / 2 && \"Invalid raw string token!\""
, "clang/lib/Lex/Pragma.cpp", 292, __extension__ __PRETTY_FUNCTION__
))
           "Invalid raw string token!")(static_cast <bool> (NumDChars < (StrVal.size() - 5)
 / 2 && "Invalid raw string token!") ? void (0) : __assert_fail
 ("NumDChars < (StrVal.size() - 5) / 2 && \"Invalid raw string token!\""
, "clang/lib/Lex/Pragma.cpp", 292, __extension__ __PRETTY_FUNCTION__
));
    ++NumDChars;
  }
  assert(StrVal[StrVal.size() - 2 - NumDChars] == ')')(static_cast <bool> (StrVal[StrVal.size() - 2 - NumDChars
] == ')') ? void (0) : __assert_fail ("StrVal[StrVal.size() - 2 - NumDChars] == ')'"
, "clang/lib/Lex/Pragma.cpp", 295, __extension__ __PRETTY_FUNCTION__
));

  // Remove 'R " d-char-sequence' and 'd-char-sequence "'. We'll replace the
  // parens below.
  StrVal.erase(0, 2 + NumDChars);
  StrVal.erase(StrVal.size() - 1 - NumDChars);
} else {
  assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&(static_cast <bool> (StrVal[0] == '"' && StrVal
[StrVal.size()-1] == '"' && "Invalid string token!") ?
 void (0) : __assert_fail ("StrVal[0] == '\"' && StrVal[StrVal.size()-1] == '\"' && \"Invalid string token!\""
, "clang/lib/Lex/Pragma.cpp", 303, __extension__ __PRETTY_FUNCTION__
))
         "Invalid string token!")(static_cast <bool> (StrVal[0] == '"' && StrVal
[StrVal.size()-1] == '"' && "Invalid string token!") ?
 void (0) : __assert_fail ("StrVal[0] == '\"' && StrVal[StrVal.size()-1] == '\"' && \"Invalid string token!\""
, "clang/lib/Lex/Pragma.cpp", 303, __extension__ __PRETTY_FUNCTION__
));

  // Remove escaped quotes and escapes.
  unsigned ResultPos = 1;
  for (size_t i = 1, e = StrVal.size() - 1; i != e; ++i) {
    // Skip escapes.  \\ -> '\' and \" -> '"'.
    if (StrVal[i] == '\\' && i + 1 < e &&
        (StrVal[i + 1] == '\\' || StrVal[i + 1] == '"'))
      ++i;
    StrVal[ResultPos++] = StrVal[i];
  }
  StrVal.erase(StrVal.begin() + ResultPos, StrVal.end() - 1);
}

// Remove the front quote, replacing it with a space, so that the pragma
// contents appear to have a space before them.
StrVal[0] = ' ';

// Replace the terminating quote with a \n.
StrVal[StrVal.size()-1] = '\n';

// Plop the string (including the newline and trailing null) into a buffer
// where we can lex it.
Token TmpTok;
TmpTok.startToken();
CreateString(StrVal, TmpTok);
SourceLocation TokLoc = TmpTok.getLocation();

// Make and enter a lexer object so that we lex and expand the tokens just
// like any others.
Lexer *TL = Lexer::Create_PragmaLexer(TokLoc, PragmaLoc, RParenLoc,
                                      StrVal.size(), *this);

EnterSourceFileWithLexer(TL, nullptr);

// With everything set up, lex this as a #pragma directive.
HandlePragmaDirective({PIK__Pragma, PragmaLoc});

// Finally, return whatever came after the pragma directive.
return Lex(Tok);
343}

345/// HandleMicrosoft__pragma - Like Handle_Pragma except the pragma text
346/// is not enclosed within a string literal.
347void Preprocessor::HandleMicrosoft__pragma(Token &Tok) {
// During macro pre-expansion, check the syntax now but put the tokens back
// into the token stream for later consumption. Same as Handle_Pragma.
TokenCollector Toks = {*this, InMacroArgPreExpansion, {}, Tok};

// Remember the pragma token location.
SourceLocation PragmaLoc = Tok.getLocation();

// Read the '('.
Toks.lex();
if (Tok.isNot(tok::l_paren)) {
  Diag(PragmaLoc, diag::err__Pragma_malformed);
  return;
}

// Get the tokens enclosed within the __pragma(), as well as the final ')'.
SmallVector<Token, 32> PragmaToks;
int NumParens = 0;
Toks.lex();
while (Tok.isNot(tok::eof)) {
  PragmaToks.push_back(Tok);
  if (Tok.is(tok::l_paren))
    NumParens++;
  else if (Tok.is(tok::r_paren) && NumParens-- == 0)
    break;
  Toks.lex();
}

if (Tok.is(tok::eof)) {
  Diag(PragmaLoc, diag::err_unterminated___pragma);
  return;
}

// If we're expanding a macro argument, put the tokens back.
if (InMacroArgPreExpansion) {
  Toks.revert();
  return;
}

PragmaToks.front().setFlag(Token::LeadingSpace);

// Replace the ')' with an EOD to mark the end of the pragma.
PragmaToks.back().setKind(tok::eod);

Token *TokArray = new Token[PragmaToks.size()];
std::copy(PragmaToks.begin(), PragmaToks.end(), TokArray);

// Push the tokens onto the stack.
EnterTokenStream(TokArray, PragmaToks.size(), true, true,
                 /*IsReinject*/ false);

// With everything set up, lex this as a #pragma directive.
HandlePragmaDirective({PIK___pragma, PragmaLoc});

// Finally, return whatever came after the pragma directive.
return Lex(Tok);
403}

405/// HandlePragmaOnce - Handle \#pragma once.  OnceTok is the 'once'.
406void Preprocessor::HandlePragmaOnce(Token &OnceTok) {
// Don't honor the 'once' when handling the primary source file, unless
// this is a prefix to a TU, which indicates we're generating a PCH file, or
// when the main file is a header (e.g. when -xc-header is provided on the
// commandline).
if (isInPrimaryFile() && TUKind != TU_Prefix && !getLangOpts().IsHeaderFile) {
  Diag(OnceTok, diag::pp_pragma_once_in_main_file);
  return;
}

// Get the current file lexer we're looking at.  Ignore _Pragma 'files' etc.
// Mark the file as a once-only file now.
HeaderInfo.MarkFileIncludeOnce(getCurrentFileLexer()->getFileEntry());
419}

421void Preprocessor::HandlePragmaMark(Token &MarkTok) {
assert(CurPPLexer && "No current lexer?")(static_cast <bool> (CurPPLexer && "No current lexer?"
) ? void (0) : __assert_fail ("CurPPLexer && \"No current lexer?\""
, "clang/lib/Lex/Pragma.cpp", 422, __extension__ __PRETTY_FUNCTION__
));

SmallString<64> Buffer;
CurLexer->ReadToEndOfLine(&Buffer);
if (Callbacks)
  Callbacks->PragmaMark(MarkTok.getLocation(), Buffer);
428}

430/// HandlePragmaPoison - Handle \#pragma GCC poison.  PoisonTok is the 'poison'.
431void Preprocessor::HandlePragmaPoison() {
Token Tok;

while (true) {
  // Read the next token to poison.  While doing this, pretend that we are
  // skipping while reading the identifier to poison.
  // This avoids errors on code like:
  //   #pragma GCC poison X
  //   #pragma GCC poison X
  if (CurPPLexer) CurPPLexer->LexingRawMode = true;
  LexUnexpandedToken(Tok);
  if (CurPPLexer) CurPPLexer->LexingRawMode = false;

  // If we reached the end of line, we're done.
  if (Tok.is(tok::eod)) return;

  // Can only poison identifiers.
  if (Tok.isNot(tok::raw_identifier)) {
    Diag(Tok, diag::err_pp_invalid_poison);
    return;
  }

  // Look up the identifier info for the token.  We disabled identifier lookup
  // by saying we're skipping contents, so we need to do this manually.
  IdentifierInfo *II = LookUpIdentifierInfo(Tok);

  // Already poisoned.
  if (II->isPoisoned()) continue;

  // If this is a macro identifier, emit a warning.
  if (isMacroDefined(II))
    Diag(Tok, diag::pp_poisoning_existing_macro);

  // Finally, poison it!
  II->setIsPoisoned();
  if (II->isFromAST())
    II->setChangedSinceDeserialization();
}
469}

471/// HandlePragmaSystemHeader - Implement \#pragma GCC system_header.  We know
472/// that the whole directive has been parsed.
473void Preprocessor::HandlePragmaSystemHeader(Token &SysHeaderTok) {
if (isInPrimaryFile()) {
  Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file);
  return;
}

// Get the current file lexer we're looking at.  Ignore _Pragma 'files' etc.
PreprocessorLexer *TheLexer = getCurrentFileLexer();

// Mark the file as a system header.
HeaderInfo.MarkFileSystemHeader(TheLexer->getFileEntry());

PresumedLoc PLoc = SourceMgr.getPresumedLoc(SysHeaderTok.getLocation());
if (PLoc.isInvalid())
  return;

unsigned FilenameID = SourceMgr.getLineTableFilenameID(PLoc.getFilename());

// Notify the client, if desired, that we are in a new source file.
if (Callbacks)
  Callbacks->FileChanged(SysHeaderTok.getLocation(),
                         PPCallbacks::SystemHeaderPragma, SrcMgr::C_System);

// Emit a line marker.  This will change any source locations from this point
// forward to realize they are in a system header.
// Create a line note with this information.
SourceMgr.AddLineNote(SysHeaderTok.getLocation(), PLoc.getLine() + 1,
                      FilenameID, /*IsEntry=*/false, /*IsExit=*/false,
                      SrcMgr::C_System);
502}

504/// HandlePragmaDependency - Handle \#pragma GCC dependency "foo" blah.
505void Preprocessor::HandlePragmaDependency(Token &DependencyTok) {
Token FilenameTok;
if (LexHeaderName(FilenameTok, /*AllowConcatenation*/false))
  return;

// If the next token wasn't a header-name, diagnose the error.
if (FilenameTok.isNot(tok::header_name)) {
  Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
  return;
}

// Reserve a buffer to get the spelling.
SmallString<128> FilenameBuffer;
bool Invalid = false;
StringRef Filename = getSpelling(FilenameTok, FilenameBuffer, &Invalid);
if (Invalid)
  return;

bool isAngled =
  GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename);
// If GetIncludeFilenameSpelling set the start ptr to null, there was an
// error.
if (Filename.empty())
  return;

// Search include directories for this file.
OptionalFileEntryRef File =
    LookupFile(FilenameTok.getLocation(), Filename, isAngled, nullptr,
               nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr);
if (!File) {
  if (!SuppressIncludeNotFoundError)
    Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
  return;
}

const FileEntry *CurFile = getCurrentFileLexer()->getFileEntry();

// If this file is older than the file it depends on, emit a diagnostic.
if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) {
  // Lex tokens at the end of the message and include them in the message.
  std::string Message;
  Lex(DependencyTok);
  while (DependencyTok.isNot(tok::eod)) {
    Message += getSpelling(DependencyTok) + " ";
    Lex(DependencyTok);
  }

  // Remove the trailing ' ' if present.
  if (!Message.empty())
    Message.erase(Message.end()-1);
  Diag(FilenameTok, diag::pp_out_of_date_dependency) << Message;
}
557}

559/// ParsePragmaPushOrPopMacro - Handle parsing of pragma push_macro/pop_macro.
560/// Return the IdentifierInfo* associated with the macro to push or pop.
561IdentifierInfo *Preprocessor::ParsePragmaPushOrPopMacro(Token &Tok) {
// Remember the pragma token location.
Token PragmaTok = Tok;

// Read the '('.
Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
  Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
    << getSpelling(PragmaTok);
  return nullptr;
}

// Read the macro name string.
Lex(Tok);
if (Tok.isNot(tok::string_literal)) {
  Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
    << getSpelling(PragmaTok);
  return nullptr;
}

if (Tok.hasUDSuffix()) {
  Diag(Tok, diag::err_invalid_string_udl);
  return nullptr;
}

// Remember the macro string.
std::string StrVal = getSpelling(Tok);

// Read the ')'.
Lex(Tok);
if (Tok.isNot(tok::r_paren)) {
  Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
    << getSpelling(PragmaTok);
  return nullptr;
}

assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&(static_cast <bool> (StrVal[0] == '"' && StrVal
[StrVal.size()-1] == '"' && "Invalid string token!") ?
 void (0) : __assert_fail ("StrVal[0] == '\"' && StrVal[StrVal.size()-1] == '\"' && \"Invalid string token!\""
, "clang/lib/Lex/Pragma.cpp", 598, __extension__ __PRETTY_FUNCTION__
))
       "Invalid string token!")(static_cast <bool> (StrVal[0] == '"' && StrVal
[StrVal.size()-1] == '"' && "Invalid string token!") ?
 void (0) : __assert_fail ("StrVal[0] == '\"' && StrVal[StrVal.size()-1] == '\"' && \"Invalid string token!\""
, "clang/lib/Lex/Pragma.cpp", 598, __extension__ __PRETTY_FUNCTION__
));

// Create a Token from the string.
Token MacroTok;
MacroTok.startToken();
MacroTok.setKind(tok::raw_identifier);
CreateString(StringRef(&StrVal[1], StrVal.size() - 2), MacroTok);

// Get the IdentifierInfo of MacroToPushTok.
return LookUpIdentifierInfo(MacroTok);
608}

610/// Handle \#pragma push_macro.
611///
612/// The syntax is:
613/// \code
614///   #pragma push_macro("macro")
615/// \endcode
616void Preprocessor::HandlePragmaPushMacro(Token &PushMacroTok) {
// Parse the pragma directive and get the macro IdentifierInfo*.
IdentifierInfo *IdentInfo = ParsePragmaPushOrPopMacro(PushMacroTok);
if (!IdentInfo) return;

// Get the MacroInfo associated with IdentInfo.
MacroInfo *MI = getMacroInfo(IdentInfo);

if (MI) {
  // Allow the original MacroInfo to be redefined later.
  MI->setIsAllowRedefinitionsWithoutWarning(true);
}

// Push the cloned MacroInfo so we can retrieve it later.
PragmaPushMacroInfo[IdentInfo].push_back(MI);
631}

633/// Handle \#pragma pop_macro.
634///
635/// The syntax is:
636/// \code
637///   #pragma pop_macro("macro")
638/// \endcode
639void Preprocessor::HandlePragmaPopMacro(Token &PopMacroTok) {
SourceLocation MessageLoc = PopMacroTok.getLocation();

// Parse the pragma directive and get the macro IdentifierInfo*.
IdentifierInfo *IdentInfo = ParsePragmaPushOrPopMacro(PopMacroTok);
if (!IdentInfo) return;

// Find the vector<MacroInfo*> associated with the macro.
llvm::DenseMap<IdentifierInfo *, std::vector<MacroInfo *>>::iterator iter =
  PragmaPushMacroInfo.find(IdentInfo);
if (iter != PragmaPushMacroInfo.end()) {
  // Forget the MacroInfo currently associated with IdentInfo.
  if (MacroInfo *MI = getMacroInfo(IdentInfo)) {
    if (MI->isWarnIfUnused())
      WarnUnusedMacroLocs.erase(MI->getDefinitionLoc());
    appendMacroDirective(IdentInfo, AllocateUndefMacroDirective(MessageLoc));
  }

  // Get the MacroInfo we want to reinstall.
  MacroInfo *MacroToReInstall = iter->second.back();

  if (MacroToReInstall)
    // Reinstall the previously pushed macro.
    appendDefMacroDirective(IdentInfo, MacroToReInstall, MessageLoc);

  // Pop PragmaPushMacroInfo stack.
  iter->second.pop_back();
  if (iter->second.empty())
    PragmaPushMacroInfo.erase(iter);
} else {
  Diag(MessageLoc, diag::warn_pragma_pop_macro_no_push)
    << IdentInfo->getName();
}
672}

674void Preprocessor::HandlePragmaIncludeAlias(Token &Tok) {
// We will either get a quoted filename or a bracketed filename, and we
// have to track which we got.  The first filename is the source name,
// and the second name is the mapped filename.  If the first is quoted,
// the second must be as well (cannot mix and match quotes and brackets).

// Get the open paren
Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
  Diag(Tok, diag::warn_pragma_include_alias_expected) << "(";
  return;
}

// We expect either a quoted string literal, or a bracketed name
Token SourceFilenameTok;
if (LexHeaderName(SourceFilenameTok))
  return;

StringRef SourceFileName;
SmallString<128> FileNameBuffer;
if (SourceFilenameTok.is(tok::header_name)) {
  SourceFileName = getSpelling(SourceFilenameTok, FileNameBuffer);
} else {
  Diag(Tok, diag::warn_pragma_include_alias_expected_filename);
  return;
}
FileNameBuffer.clear();

// Now we expect a comma, followed by another include name
Lex(Tok);
if (Tok.isNot(tok::comma)) {
  Diag(Tok, diag::warn_pragma_include_alias_expected) << ",";
  return;
}

Token ReplaceFilenameTok;
if (LexHeaderName(ReplaceFilenameTok))
  return;

StringRef ReplaceFileName;
if (ReplaceFilenameTok.is(tok::header_name)) {
  ReplaceFileName = getSpelling(ReplaceFilenameTok, FileNameBuffer);
} else {
  Diag(Tok, diag::warn_pragma_include_alias_expected_filename);
  return;
}

// Finally, we expect the closing paren
Lex(Tok);
if (Tok.isNot(tok::r_paren)) {
  Diag(Tok, diag::warn_pragma_include_alias_expected) << ")";
  return;
}

// Now that we have the source and target filenames, we need to make sure
// they're both of the same type (angled vs non-angled)
StringRef OriginalSource = SourceFileName;

bool SourceIsAngled =
  GetIncludeFilenameSpelling(SourceFilenameTok.getLocation(),
                              SourceFileName);
bool ReplaceIsAngled =
  GetIncludeFilenameSpelling(ReplaceFilenameTok.getLocation(),
                              ReplaceFileName);
if (!SourceFileName.empty() && !ReplaceFileName.empty() &&
    (SourceIsAngled != ReplaceIsAngled)) {
  unsigned int DiagID;
  if (SourceIsAngled)
    DiagID = diag::warn_pragma_include_alias_mismatch_angle;
  else
    DiagID = diag::warn_pragma_include_alias_mismatch_quote;

  Diag(SourceFilenameTok.getLocation(), DiagID)
    << SourceFileName
    << ReplaceFileName;

  return;
}

// Now we can let the include handler know about this mapping
getHeaderSearchInfo().AddIncludeAlias(OriginalSource, ReplaceFileName);
755}

757// Lex a component of a module name: either an identifier or a string literal;
758// for components that can be expressed both ways, the two forms are equivalent.
759static bool LexModuleNameComponent(
  Preprocessor &PP, Token &Tok,
  std::pair<IdentifierInfo *, SourceLocation> &ModuleNameComponent,
  bool First) {
PP.LexUnexpandedToken(Tok);
if (Tok.is(tok::string_literal) && !Tok.hasUDSuffix()) {
  StringLiteralParser Literal(Tok, PP);
  if (Literal.hadError)
    return true;
  ModuleNameComponent = std::make_pair(
      PP.getIdentifierInfo(Literal.GetString()), Tok.getLocation());
} else if (!Tok.isAnnotation() && Tok.getIdentifierInfo()) {
  ModuleNameComponent =
      std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation());
} else {
  PP.Diag(Tok.getLocation(), diag::err_pp_expected_module_name) << First;
  return true;
}
return false;
778}

780static bool LexModuleName(
  Preprocessor &PP, Token &Tok,
  llvm::SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>>
      &ModuleName) {
while (true) {
  std::pair<IdentifierInfo*, SourceLocation> NameComponent;
  if (LexModuleNameComponent(PP, Tok, NameComponent, ModuleName.empty()))
    return true;
  ModuleName.push_back(NameComponent);

  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::period))
    return false;
}
794}

796void Preprocessor::HandlePragmaModuleBuild(Token &Tok) {
SourceLocation Loc = Tok.getLocation();

std::pair<IdentifierInfo *, SourceLocation> ModuleNameLoc;
if (LexModuleNameComponent(*this, Tok, ModuleNameLoc, true))
  return;
IdentifierInfo *ModuleName = ModuleNameLoc.first;

LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod)) {
  Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";
  DiscardUntilEndOfDirective();
}

CurLexer->LexingRawMode = true;

auto TryConsumeIdentifier = [&](StringRef Ident) -> bool {
  if (Tok.getKind() != tok::raw_identifier ||
      Tok.getRawIdentifier() != Ident)
    return false;
  CurLexer->Lex(Tok);
  return true;
};

// Scan forward looking for the end of the module.
const char *Start = CurLexer->getBufferLocation();
const char *End = nullptr;
unsigned NestingLevel = 1;
while (true) {
  End = CurLexer->getBufferLocation();
  CurLexer->Lex(Tok);

  if (Tok.is(tok::eof)) {
    Diag(Loc, diag::err_pp_module_build_missing_end);
    break;
  }

  if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine()) {
    // Token was part of module; keep going.
    continue;
  }

  // We hit something directive-shaped; check to see if this is the end
  // of the module build.
  CurLexer->ParsingPreprocessorDirective = true;
  CurLexer->Lex(Tok);
  if (TryConsumeIdentifier("pragma") && TryConsumeIdentifier("clang") &&
      TryConsumeIdentifier("module")) {
    if (TryConsumeIdentifier("build"))
      // #pragma clang module build -> entering a nested module build.
      ++NestingLevel;
    else if (TryConsumeIdentifier("endbuild")) {
      // #pragma clang module endbuild -> leaving a module build.
      if (--NestingLevel == 0)
        break;
    }
    // We should either be looking at the EOD or more of the current directive
    // preceding the EOD. Either way we can ignore this token and keep going.
    assert(Tok.getKind() != tok::eof && "missing EOD before EOF")(static_cast <bool> (Tok.getKind() != tok::eof &&
 "missing EOD before EOF") ? void (0) : __assert_fail ("Tok.getKind() != tok::eof && \"missing EOD before EOF\""
, "clang/lib/Lex/Pragma.cpp", 854, __extension__ __PRETTY_FUNCTION__
));
  }
}

CurLexer->LexingRawMode = false;

// Load the extracted text as a preprocessed module.
assert(CurLexer->getBuffer().begin() <= Start &&(static_cast <bool> (CurLexer->getBuffer().begin() <=
 Start && Start <= CurLexer->getBuffer().end() &&
 CurLexer->getBuffer().begin() <= End && End <=
 CurLexer->getBuffer().end() && "module source range not contained within same file buffer"
) ? void (0) : __assert_fail ("CurLexer->getBuffer().begin() <= Start && Start <= CurLexer->getBuffer().end() && CurLexer->getBuffer().begin() <= End && End <= CurLexer->getBuffer().end() && \"module source range not contained within same file buffer\""
, "clang/lib/Lex/Pragma.cpp", 865, __extension__ __PRETTY_FUNCTION__
))
       Start <= CurLexer->getBuffer().end() &&(static_cast <bool> (CurLexer->getBuffer().begin() <=
 Start && Start <= CurLexer->getBuffer().end() &&
 CurLexer->getBuffer().begin() <= End && End <=
 CurLexer->getBuffer().end() && "module source range not contained within same file buffer"
) ? void (0) : __assert_fail ("CurLexer->getBuffer().begin() <= Start && Start <= CurLexer->getBuffer().end() && CurLexer->getBuffer().begin() <= End && End <= CurLexer->getBuffer().end() && \"module source range not contained within same file buffer\""
, "clang/lib/Lex/Pragma.cpp", 865, __extension__ __PRETTY_FUNCTION__
))
       CurLexer->getBuffer().begin() <= End &&(static_cast <bool> (CurLexer->getBuffer().begin() <=
 Start && Start <= CurLexer->getBuffer().end() &&
 CurLexer->getBuffer().begin() <= End && End <=
 CurLexer->getBuffer().end() && "module source range not contained within same file buffer"
) ? void (0) : __assert_fail ("CurLexer->getBuffer().begin() <= Start && Start <= CurLexer->getBuffer().end() && CurLexer->getBuffer().begin() <= End && End <= CurLexer->getBuffer().end() && \"module source range not contained within same file buffer\""
, "clang/lib/Lex/Pragma.cpp", 865, __extension__ __PRETTY_FUNCTION__
))
       End <= CurLexer->getBuffer().end() &&(static_cast <bool> (CurLexer->getBuffer().begin() <=
 Start && Start <= CurLexer->getBuffer().end() &&
 CurLexer->getBuffer().begin() <= End && End <=
 CurLexer->getBuffer().end() && "module source range not contained within same file buffer"
) ? void (0) : __assert_fail ("CurLexer->getBuffer().begin() <= Start && Start <= CurLexer->getBuffer().end() && CurLexer->getBuffer().begin() <= End && End <= CurLexer->getBuffer().end() && \"module source range not contained within same file buffer\""
, "clang/lib/Lex/Pragma.cpp", 865, __extension__ __PRETTY_FUNCTION__
))
       "module source range not contained within same file buffer")(static_cast <bool> (CurLexer->getBuffer().begin() <=
 Start && Start <= CurLexer->getBuffer().end() &&
 CurLexer->getBuffer().begin() <= End && End <=
 CurLexer->getBuffer().end() && "module source range not contained within same file buffer"
) ? void (0) : __assert_fail ("CurLexer->getBuffer().begin() <= Start && Start <= CurLexer->getBuffer().end() && CurLexer->getBuffer().begin() <= End && End <= CurLexer->getBuffer().end() && \"module source range not contained within same file buffer\""
, "clang/lib/Lex/Pragma.cpp", 865, __extension__ __PRETTY_FUNCTION__
));
TheModuleLoader.createModuleFromSource(Loc, ModuleName->getName(),
                                       StringRef(Start, End - Start));
868}

870void Preprocessor::HandlePragmaHdrstop(Token &Tok) {
Lex(Tok);
if (Tok.is(tok::l_paren)) {
  Diag(Tok.getLocation(), diag::warn_pp_hdrstop_filename_ignored);

  std::string FileName;
  if (!LexStringLiteral(Tok, FileName, "pragma hdrstop", false))
    return;

  if (Tok.isNot(tok::r_paren)) {
    Diag(Tok, diag::err_expected) << tok::r_paren;
    return;
  }
  Lex(Tok);
}
if (Tok.isNot(tok::eod))
  Diag(Tok.getLocation(), diag::ext_pp_extra_tokens_at_eol)
      << "pragma hdrstop";

if (creatingPCHWithPragmaHdrStop() &&
    SourceMgr.isInMainFile(Tok.getLocation())) {
  assert(CurLexer && "no lexer for #pragma hdrstop processing")(static_cast <bool> (CurLexer && "no lexer for #pragma hdrstop processing"
) ? void (0) : __assert_fail ("CurLexer && \"no lexer for #pragma hdrstop processing\""
, "clang/lib/Lex/Pragma.cpp", 891, __extension__ __PRETTY_FUNCTION__
));
  Token &Result = Tok;
  Result.startToken();
  CurLexer->FormTokenWithChars(Result, CurLexer->BufferEnd, tok::eof);
  CurLexer->cutOffLexing();
}
if (usingPCHWithPragmaHdrStop())
  SkippingUntilPragmaHdrStop = false;
899}

901/// AddPragmaHandler - Add the specified pragma handler to the preprocessor.
902/// If 'Namespace' is non-null, then it is a token required to exist on the
903/// pragma line before the pragma string starts, e.g. "STDC" or "GCC".
904void Preprocessor::AddPragmaHandler(StringRef Namespace,
                                  PragmaHandler *Handler) {
PragmaNamespace *InsertNS = PragmaHandlers.get();

// If this is specified to be in a namespace, step down into it.
if (!Namespace.empty()) {
  // If there is already a pragma handler with the name of this namespace,
  // we either have an error (directive with the same name as a namespace) or
  // we already have the namespace to insert into.
  if (PragmaHandler *Existing = PragmaHandlers->FindHandler(Namespace)) {
    InsertNS = Existing->getIfNamespace();
    assert(InsertNS != nullptr && "Cannot have a pragma namespace and pragma"(static_cast <bool> (InsertNS != nullptr && "Cannot have a pragma namespace and pragma"
 " handler with the same name!") ? void (0) : __assert_fail (
"InsertNS != nullptr && \"Cannot have a pragma namespace and pragma\" \" handler with the same name!\""
, "clang/lib/Lex/Pragma.cpp", 916, __extension__ __PRETTY_FUNCTION__
))
           " handler with the same name!")(static_cast <bool> (InsertNS != nullptr && "Cannot have a pragma namespace and pragma"
 " handler with the same name!") ? void (0) : __assert_fail (
"InsertNS != nullptr && \"Cannot have a pragma namespace and pragma\" \" handler with the same name!\""
, "clang/lib/Lex/Pragma.cpp", 916, __extension__ __PRETTY_FUNCTION__
));
  } else {
    // Otherwise, this namespace doesn't exist yet, create and insert the
    // handler for it.
    InsertNS = new PragmaNamespace(Namespace);
    PragmaHandlers->AddPragma(InsertNS);
  }
}

// Check to make sure we don't already have a pragma for this identifier.
assert(!InsertNS->FindHandler(Handler->getName()) &&(static_cast <bool> (!InsertNS->FindHandler(Handler->
getName()) && "Pragma handler already exists for this identifier!"
) ? void (0) : __assert_fail ("!InsertNS->FindHandler(Handler->getName()) && \"Pragma handler already exists for this identifier!\""
, "clang/lib/Lex/Pragma.cpp", 927, __extension__ __PRETTY_FUNCTION__
))
       "Pragma handler already exists for this identifier!")(static_cast <bool> (!InsertNS->FindHandler(Handler->
getName()) && "Pragma handler already exists for this identifier!"
) ? void (0) : __assert_fail ("!InsertNS->FindHandler(Handler->getName()) && \"Pragma handler already exists for this identifier!\""
, "clang/lib/Lex/Pragma.cpp", 927, __extension__ __PRETTY_FUNCTION__
));
InsertNS->AddPragma(Handler);
929}

931/// RemovePragmaHandler - Remove the specific pragma handler from the
932/// preprocessor. If \arg Namespace is non-null, then it should be the
933/// namespace that \arg Handler was added to. It is an error to remove
934/// a handler that has not been registered.
935void Preprocessor::RemovePragmaHandler(StringRef Namespace,
                                     PragmaHandler *Handler) {
PragmaNamespace *NS = PragmaHandlers.get();

// If this is specified to be in a namespace, step down into it.
if (!Namespace.empty()) {
  PragmaHandler *Existing = PragmaHandlers->FindHandler(Namespace);
  assert(Existing && "Namespace containing handler does not exist!")(static_cast <bool> (Existing && "Namespace containing handler does not exist!"
) ? void (0) : __assert_fail ("Existing && \"Namespace containing handler does not exist!\""
, "clang/lib/Lex/Pragma.cpp", 942, __extension__ __PRETTY_FUNCTION__
));

  NS = Existing->getIfNamespace();
  assert(NS && "Invalid namespace, registered as a regular pragma handler!")(static_cast <bool> (NS && "Invalid namespace, registered as a regular pragma handler!"
) ? void (0) : __assert_fail ("NS && \"Invalid namespace, registered as a regular pragma handler!\""
, "clang/lib/Lex/Pragma.cpp", 945, __extension__ __PRETTY_FUNCTION__
));
}

NS->RemovePragmaHandler(Handler);

// If this is a non-default namespace and it is now empty, remove it.
if (NS != PragmaHandlers.get() && NS->IsEmpty()) {
  PragmaHandlers->RemovePragmaHandler(NS);
  delete NS;
}
955}

957bool Preprocessor::LexOnOffSwitch(tok::OnOffSwitch &Result) {
Token Tok;
LexUnexpandedToken(Tok);

if (Tok.isNot(tok::identifier)) {
  Diag(Tok, diag::ext_on_off_switch_syntax);
  return true;
}
IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("ON"))
  Result = tok::OOS_ON;
else if (II->isStr("OFF"))
  Result = tok::OOS_OFF;
else if (II->isStr("DEFAULT"))
  Result = tok::OOS_DEFAULT;
else {
  Diag(Tok, diag::ext_on_off_switch_syntax);
  return true;
}

// Verify that this is followed by EOD.
LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod))
  Diag(Tok, diag::ext_pragma_syntax_eod);
return false;
982}

984namespace {

986/// PragmaOnceHandler - "\#pragma once" marks the file as atomically included.
987struct PragmaOnceHandler : public PragmaHandler {
PragmaOnceHandler() : PragmaHandler("once") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &OnceTok) override {
  PP.CheckEndOfDirective("pragma once");
  PP.HandlePragmaOnce(OnceTok);
}
995};

997/// PragmaMarkHandler - "\#pragma mark ..." is ignored by the compiler, and the
998/// rest of the line is not lexed.
999struct PragmaMarkHandler : public PragmaHandler {
PragmaMarkHandler() : PragmaHandler("mark") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &MarkTok) override {
  PP.HandlePragmaMark(MarkTok);
}
1006};

1008/// PragmaPoisonHandler - "\#pragma poison x" marks x as not usable.
1009struct PragmaPoisonHandler : public PragmaHandler {
PragmaPoisonHandler() : PragmaHandler("poison") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &PoisonTok) override {
  PP.HandlePragmaPoison();
}
1016};

1018/// PragmaSystemHeaderHandler - "\#pragma system_header" marks the current file
1019/// as a system header, which silences warnings in it.
1020struct PragmaSystemHeaderHandler : public PragmaHandler {
PragmaSystemHeaderHandler() : PragmaHandler("system_header") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &SHToken) override {
  PP.HandlePragmaSystemHeader(SHToken);
  PP.CheckEndOfDirective("pragma");
}
1028};

1030struct PragmaDependencyHandler : public PragmaHandler {
PragmaDependencyHandler() : PragmaHandler("dependency") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &DepToken) override {
  PP.HandlePragmaDependency(DepToken);
}
1037};

1039struct PragmaDebugHandler : public PragmaHandler {
PragmaDebugHandler() : PragmaHandler("__debug") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &DebugToken) override {
  Token Tok;
  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::identifier)) {
1
Taking false branch→
    PP.Diag(Tok, diag::warn_pragma_debug_missing_command);
    return;
  }
  IdentifierInfo *II = Tok.getIdentifierInfo();

  if (II->isStr("assert")) {
2
←
Taking false branch→
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
      llvm_unreachable("This is an assertion!")::llvm::llvm_unreachable_internal("This is an assertion!", "clang/lib/Lex/Pragma.cpp"
, 1054);
  } else if (II->isStr("crash")) {
3
←
Taking false branch→
    llvm::Timer T("crash", "pragma crash");
    llvm::TimeRegion R(&T);
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
      LLVM_BUILTIN_TRAP__builtin_trap();
  } else if (II->isStr("parser_crash")) {
4
←
Taking false branch→
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash) {
      Token Crasher;
      Crasher.startToken();
      Crasher.setKind(tok::annot_pragma_parser_crash);
      Crasher.setAnnotationRange(SourceRange(Tok.getLocation()));
      PP.EnterToken(Crasher, /*IsReinject*/ false);
    }
  } else if (II->isStr("dump")) {
5
←
Taking false branch→
    Token Identifier;
    PP.LexUnexpandedToken(Identifier);
    if (auto *DumpII = Identifier.getIdentifierInfo()) {
      Token DumpAnnot;
      DumpAnnot.startToken();
      DumpAnnot.setKind(tok::annot_pragma_dump);
      DumpAnnot.setAnnotationRange(
          SourceRange(Tok.getLocation(), Identifier.getLocation()));
      DumpAnnot.setAnnotationValue(DumpII);
      PP.DiscardUntilEndOfDirective();
      PP.EnterToken(DumpAnnot, /*IsReinject*/false);
    } else {
      PP.Diag(Identifier, diag::warn_pragma_debug_missing_argument)
          << II->getName();
    }
  } else if (II->isStr("diag_mapping")) {
6
←
Taking false branch→
    Token DiagName;
    PP.LexUnexpandedToken(DiagName);
    if (DiagName.is(tok::eod))
      PP.getDiagnostics().dump();
    else if (DiagName.is(tok::string_literal) && !DiagName.hasUDSuffix()) {
      StringLiteralParser Literal(DiagName, PP);
      if (Literal.hadError)
        return;
      PP.getDiagnostics().dump(Literal.GetString());
    } else {
      PP.Diag(DiagName, diag::warn_pragma_debug_missing_argument)
          << II->getName();
    }
  } else if (II->isStr("llvm_fatal_error")) {
7
←
Taking false branch→
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
      llvm::report_fatal_error("#pragma clang __debug llvm_fatal_error");
  } else if (II->isStr("llvm_unreachable")) {
8
←
Taking false branch→
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
      llvm_unreachable("#pragma clang __debug llvm_unreachable")::llvm::llvm_unreachable_internal("#pragma clang __debug llvm_unreachable"
, "clang/lib/Lex/Pragma.cpp", 1103);
  } else if (II->isStr("macro")) {
9
←
Taking false branch→
    Token MacroName;
    PP.LexUnexpandedToken(MacroName);
    auto *MacroII = MacroName.getIdentifierInfo();
    if (MacroII)
      PP.dumpMacroInfo(MacroII);
    else
      PP.Diag(MacroName, diag::warn_pragma_debug_missing_argument)
          << II->getName();
  } else if (II->isStr("module_map")) {
10
←
Taking true branch→
    llvm::SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 8>
        ModuleName;
    if (LexModuleName(PP, Tok, ModuleName))
11
←
Assuming the condition is false→
12
←
Taking false branch→
      return;
    ModuleMap &MM = PP.getHeaderSearchInfo().getModuleMap();
    Module *M = nullptr;
13
←
'M' initialized to a null pointer value→
    for (auto IIAndLoc : ModuleName) {
14
←
Assuming '__begin11' is equal to '__end11'→
      M = MM.lookupModuleQualified(IIAndLoc.first->getName(), M);
      if (!M) {
        PP.Diag(IIAndLoc.second, diag::warn_pragma_debug_unknown_module)
            << IIAndLoc.first;
        return;
      }
    }
    M->dump();
15
←
Called C++ object pointer is null
  } else if (II->isStr("overflow_stack")) {
    if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
      DebugOverflowStack();
  } else if (II->isStr("captured")) {
    HandleCaptured(PP);
  } else if (II->isStr("modules")) {
    struct ModuleVisitor {
      Preprocessor &PP;
      void visit(Module *M, bool VisibleOnly) {
        SourceLocation ImportLoc = PP.getModuleImportLoc(M);
        if (!VisibleOnly || ImportLoc.isValid()) {
          llvm::errs() << M->getFullModuleName() << " ";
          if (ImportLoc.isValid()) {
            llvm::errs() << M << " visible ";
            ImportLoc.print(llvm::errs(), PP.getSourceManager());
          }
          llvm::errs() << "\n";
        }
        for (Module *Sub : M->submodules()) {
          if (!VisibleOnly || ImportLoc.isInvalid() || Sub->IsExplicit)
            visit(Sub, VisibleOnly);
        }
      }
      void visitAll(bool VisibleOnly) {
        for (auto &NameAndMod :
             PP.getHeaderSearchInfo().getModuleMap().modules())
          visit(NameAndMod.second, VisibleOnly);
      }
    } Visitor{PP};

    Token Kind;
    PP.LexUnexpandedToken(Kind);
    auto *DumpII = Kind.getIdentifierInfo();
    if (!DumpII) {
      PP.Diag(Kind, diag::warn_pragma_debug_missing_argument)
          << II->getName();
    } else if (DumpII->isStr("all")) {
      Visitor.visitAll(false);
    } else if (DumpII->isStr("visible")) {
      Visitor.visitAll(true);
    } else if (DumpII->isStr("building")) {
      for (auto &Building : PP.getBuildingSubmodules()) {
        llvm::errs() << "in " << Building.M->getFullModuleName();
        if (Building.ImportLoc.isValid()) {
          llvm::errs() << " imported ";
          if (Building.IsPragma)
            llvm::errs() << "via pragma ";
          llvm::errs() << "at ";
          Building.ImportLoc.print(llvm::errs(), PP.getSourceManager());
          llvm::errs() << "\n";
        }
      }
    } else {
      PP.Diag(Tok, diag::warn_pragma_debug_unexpected_command)
        << DumpII->getName();
    }
  } else if (II->isStr("sloc_usage")) {
    // An optional integer literal argument specifies the number of files to
    // specifically report information about.
    std::optional<unsigned> MaxNotes;
    Token ArgToken;
    PP.Lex(ArgToken);
    uint64_t Value;
    if (ArgToken.is(tok::numeric_constant) &&
        PP.parseSimpleIntegerLiteral(ArgToken, Value)) {
      MaxNotes = Value;
    } else if (ArgToken.isNot(tok::eod)) {
      PP.Diag(ArgToken, diag::warn_pragma_debug_unexpected_argument);
    }

    PP.Diag(Tok, diag::remark_sloc_usage);
    PP.getSourceManager().noteSLocAddressSpaceUsage(PP.getDiagnostics(),
                                                    MaxNotes);
  } else {
    PP.Diag(Tok, diag::warn_pragma_debug_unexpected_command)
      << II->getName();
  }

  PPCallbacks *Callbacks = PP.getPPCallbacks();
  if (Callbacks)
    Callbacks->PragmaDebug(Tok.getLocation(), II->getName());
}

void HandleCaptured(Preprocessor &PP) {
  Token Tok;
  PP.LexUnexpandedToken(Tok);

  if (Tok.isNot(tok::eod)) {
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol)
      << "pragma clang __debug captured";
    return;
  }

  SourceLocation NameLoc = Tok.getLocation();
  MutableArrayRef<Token> Toks(
      PP.getPreprocessorAllocator().Allocate<Token>(1), 1);
  Toks[0].startToken();
  Toks[0].setKind(tok::annot_pragma_captured);
  Toks[0].setLocation(NameLoc);

  PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true,
                      /*IsReinject=*/false);
}

1233// Disable MSVC warning about runtime stack overflow.
1234#ifdef _MSC_VER
  #pragma warning(disable : 4717)
1236#endif
static void DebugOverflowStack(void (*P)() = nullptr) {
  void (*volatile Self)(void(*P)()) = DebugOverflowStack;
  Self(reinterpret_cast<void(*)()>(Self));
}
1241#ifdef _MSC_VER
  #pragma warning(default : 4717)
1243#endif
1244};

1246struct PragmaUnsafeBufferUsageHandler : public PragmaHandler {
PragmaUnsafeBufferUsageHandler() : PragmaHandler("unsafe_buffer_usage") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &FirstToken) override {
  Token Tok;

  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::identifier)) {
    PP.Diag(Tok, diag::err_pp_pragma_unsafe_buffer_usage_syntax);
    return;
  }

  IdentifierInfo *II = Tok.getIdentifierInfo();
  SourceLocation Loc = Tok.getLocation();

  if (II->isStr("begin")) {
    if (PP.enterOrExitSafeBufferOptOutRegion(true, Loc))
      PP.Diag(Loc, diag::err_pp_double_begin_pragma_unsafe_buffer_usage);
  } else if (II->isStr("end")) {
    if (PP.enterOrExitSafeBufferOptOutRegion(false, Loc))
      PP.Diag(Loc, diag::err_pp_unmatched_end_begin_pragma_unsafe_buffer_usage);
  } else
    PP.Diag(Tok, diag::err_pp_pragma_unsafe_buffer_usage_syntax);
}
1270};

1272/// PragmaDiagnosticHandler - e.g. '\#pragma GCC diagnostic ignored "-Wformat"'
1273struct PragmaDiagnosticHandler : public PragmaHandler {
1274private:
const char *Namespace;

1277public:
explicit PragmaDiagnosticHandler(const char *NS)
    : PragmaHandler("diagnostic"), Namespace(NS) {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &DiagToken) override {
  SourceLocation DiagLoc = DiagToken.getLocation();
  Token Tok;
  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::identifier)) {
    PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
    return;
  }
  IdentifierInfo *II = Tok.getIdentifierInfo();
  PPCallbacks *Callbacks = PP.getPPCallbacks();

  if (II->isStr("pop")) {
    if (!PP.getDiagnostics().popMappings(DiagLoc))
      PP.Diag(Tok, diag::warn_pragma_diagnostic_cannot_pop);
    else if (Callbacks)
      Callbacks->PragmaDiagnosticPop(DiagLoc, Namespace);
    return;
  } else if (II->isStr("push")) {
    PP.getDiagnostics().pushMappings(DiagLoc);
    if (Callbacks)
      Callbacks->PragmaDiagnosticPush(DiagLoc, Namespace);
    return;
  }

  diag::Severity SV = llvm::StringSwitch<diag::Severity>(II->getName())
                          .Case("ignored", diag::Severity::Ignored)
                          .Case("warning", diag::Severity::Warning)
                          .Case("error", diag::Severity::Error)
                          .Case("fatal", diag::Severity::Fatal)
                          .Default(diag::Severity());

  if (SV == diag::Severity()) {
    PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
    return;
  }

  PP.LexUnexpandedToken(Tok);
  SourceLocation StringLoc = Tok.getLocation();

  std::string WarningName;
  if (!PP.FinishLexStringLiteral(Tok, WarningName, "pragma diagnostic",
                                 /*AllowMacroExpansion=*/false))
    return;

  if (Tok.isNot(tok::eod)) {
    PP.Diag(Tok.getLocation(), diag::warn_pragma_diagnostic_invalid_token);
    return;
  }

  if (WarningName.size() < 3 || WarningName[0] != '-' ||
      (WarningName[1] != 'W' && WarningName[1] != 'R')) {
    PP.Diag(StringLoc, diag::warn_pragma_diagnostic_invalid_option);
    return;
  }

  diag::Flavor Flavor = WarningName[1] == 'W' ? diag::Flavor::WarningOrError
                                              : diag::Flavor::Remark;
  StringRef Group = StringRef(WarningName).substr(2);
  bool unknownDiag = false;
  if (Group == "everything") {
    // Special handling for pragma clang diagnostic ... "-Weverything".
    // There is no formal group named "everything", so there has to be a
    // special case for it.
    PP.getDiagnostics().setSeverityForAll(Flavor, SV, DiagLoc);
  } else
    unknownDiag = PP.getDiagnostics().setSeverityForGroup(Flavor, Group, SV,
                                                          DiagLoc);
  if (unknownDiag)
    PP.Diag(StringLoc, diag::warn_pragma_diagnostic_unknown_warning)
      << WarningName;
  else if (Callbacks)
    Callbacks->PragmaDiagnostic(DiagLoc, Namespace, SV, WarningName);
}
1355};

1357/// "\#pragma hdrstop [<header-name-string>]"
1358struct PragmaHdrstopHandler : public PragmaHandler {
PragmaHdrstopHandler() : PragmaHandler("hdrstop") {}
void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &DepToken) override {
  PP.HandlePragmaHdrstop(DepToken);
}
1364};

1366/// "\#pragma warning(...)".  MSVC's diagnostics do not map cleanly to clang's
1367/// diagnostics, so we don't really implement this pragma.  We parse it and
1368/// ignore it to avoid -Wunknown-pragma warnings.
1369struct PragmaWarningHandler : public PragmaHandler {
PragmaWarningHandler() : PragmaHandler("warning") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  // Parse things like:
  // warning(push, 1)
  // warning(pop)
  // warning(disable : 1 2 3 ; error : 4 5 6 ; suppress : 7 8 9)
  SourceLocation DiagLoc = Tok.getLocation();
  PPCallbacks *Callbacks = PP.getPPCallbacks();

  PP.Lex(Tok);
  if (Tok.isNot(tok::l_paren)) {
    PP.Diag(Tok, diag::warn_pragma_warning_expected) << "(";
    return;
  }

  PP.Lex(Tok);
  IdentifierInfo *II = Tok.getIdentifierInfo();

  if (II && II->isStr("push")) {
    // #pragma warning( push[ ,n ] )
    int Level = -1;
    PP.Lex(Tok);
    if (Tok.is(tok::comma)) {
      PP.Lex(Tok);
      uint64_t Value;
      if (Tok.is(tok::numeric_constant) &&
          PP.parseSimpleIntegerLiteral(Tok, Value))
        Level = int(Value);
      if (Level < 0 || Level > 4) {
        PP.Diag(Tok, diag::warn_pragma_warning_push_level);
        return;
      }
    }
    PP.getDiagnostics().pushMappings(DiagLoc);
    if (Callbacks)
      Callbacks->PragmaWarningPush(DiagLoc, Level);
  } else if (II && II->isStr("pop")) {
    // #pragma warning( pop )
    PP.Lex(Tok);
    if (!PP.getDiagnostics().popMappings(DiagLoc))
      PP.Diag(Tok, diag::warn_pragma_diagnostic_cannot_pop);
    else if (Callbacks)
      Callbacks->PragmaWarningPop(DiagLoc);
  } else {
    // #pragma warning( warning-specifier : warning-number-list
    //                  [; warning-specifier : warning-number-list...] )
    while (true) {
      II = Tok.getIdentifierInfo();
      if (!II && !Tok.is(tok::numeric_constant)) {
        PP.Diag(Tok, diag::warn_pragma_warning_spec_invalid);
        return;
      }

      // Figure out which warning specifier this is.
      bool SpecifierValid;
      PPCallbacks::PragmaWarningSpecifier Specifier;
      if (II) {
        int SpecifierInt = llvm::StringSwitch<int>(II->getName())
                               .Case("default", PPCallbacks::PWS_Default)
                               .Case("disable", PPCallbacks::PWS_Disable)
                               .Case("error", PPCallbacks::PWS_Error)
                               .Case("once", PPCallbacks::PWS_Once)
                               .Case("suppress", PPCallbacks::PWS_Suppress)
                               .Default(-1);
        if ((SpecifierValid = SpecifierInt != -1))
          Specifier =
              static_cast<PPCallbacks::PragmaWarningSpecifier>(SpecifierInt);

        // If we read a correct specifier, snatch next token (that should be
        // ":", checked later).
        if (SpecifierValid)
          PP.Lex(Tok);
      } else {
        // Token is a numeric constant. It should be either 1, 2, 3 or 4.
        uint64_t Value;
        if (PP.parseSimpleIntegerLiteral(Tok, Value)) {
          if ((SpecifierValid = (Value >= 1) && (Value <= 4)))
            Specifier = static_cast<PPCallbacks::PragmaWarningSpecifier>(
                PPCallbacks::PWS_Level1 + Value - 1);
        } else
          SpecifierValid = false;
        // Next token already snatched by parseSimpleIntegerLiteral.
      }

      if (!SpecifierValid) {
        PP.Diag(Tok, diag::warn_pragma_warning_spec_invalid);
        return;
      }
      if (Tok.isNot(tok::colon)) {
        PP.Diag(Tok, diag::warn_pragma_warning_expected) << ":";
        return;
      }

      // Collect the warning ids.
      SmallVector<int, 4> Ids;
      PP.Lex(Tok);
      while (Tok.is(tok::numeric_constant)) {
        uint64_t Value;
        if (!PP.parseSimpleIntegerLiteral(Tok, Value) || Value == 0 ||
            Value > INT_MAX2147483647) {
          PP.Diag(Tok, diag::warn_pragma_warning_expected_number);
          return;
        }
        Ids.push_back(int(Value));
      }

      // Only act on disable for now.
      diag::Severity SV = diag::Severity();
      if (Specifier == PPCallbacks::PWS_Disable)
        SV = diag::Severity::Ignored;
      if (SV != diag::Severity())
        for (int Id : Ids) {
          if (auto Group = diagGroupFromCLWarningID(Id)) {
            bool unknownDiag = PP.getDiagnostics().setSeverityForGroup(
                diag::Flavor::WarningOrError, *Group, SV, DiagLoc);
            assert(!unknownDiag &&(static_cast <bool> (!unknownDiag && "wd table should only contain known diags"
) ? void (0) : __assert_fail ("!unknownDiag && \"wd table should only contain known diags\""
, "clang/lib/Lex/Pragma.cpp", 1488, __extension__ __PRETTY_FUNCTION__
))
                   "wd table should only contain known diags")(static_cast <bool> (!unknownDiag && "wd table should only contain known diags"
) ? void (0) : __assert_fail ("!unknownDiag && \"wd table should only contain known diags\""
, "clang/lib/Lex/Pragma.cpp", 1488, __extension__ __PRETTY_FUNCTION__
));
            (void)unknownDiag;
          }
        }

      if (Callbacks)
        Callbacks->PragmaWarning(DiagLoc, Specifier, Ids);

      // Parse the next specifier if there is a semicolon.
      if (Tok.isNot(tok::semi))
        break;
      PP.Lex(Tok);
    }
  }

  if (Tok.isNot(tok::r_paren)) {
    PP.Diag(Tok, diag::warn_pragma_warning_expected) << ")";
    return;
  }

  PP.Lex(Tok);
  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma warning";
}
1512};

1514/// "\#pragma execution_character_set(...)". MSVC supports this pragma only
1515/// for "UTF-8". We parse it and ignore it if UTF-8 is provided and warn
1516/// otherwise to avoid -Wunknown-pragma warnings.
1517struct PragmaExecCharsetHandler : public PragmaHandler {
PragmaExecCharsetHandler() : PragmaHandler("execution_character_set") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  // Parse things like:
  // execution_character_set(push, "UTF-8")
  // execution_character_set(pop)
  SourceLocation DiagLoc = Tok.getLocation();
  PPCallbacks *Callbacks = PP.getPPCallbacks();

  PP.Lex(Tok);
  if (Tok.isNot(tok::l_paren)) {
    PP.Diag(Tok, diag::warn_pragma_exec_charset_expected) << "(";
    return;
  }

  PP.Lex(Tok);
  IdentifierInfo *II = Tok.getIdentifierInfo();

  if (II && II->isStr("push")) {
    // #pragma execution_character_set( push[ , string ] )
    PP.Lex(Tok);
    if (Tok.is(tok::comma)) {
      PP.Lex(Tok);

      std::string ExecCharset;
      if (!PP.FinishLexStringLiteral(Tok, ExecCharset,
                                     "pragma execution_character_set",
                                     /*AllowMacroExpansion=*/false))
        return;

      // MSVC supports either of these, but nothing else.
      if (ExecCharset != "UTF-8" && ExecCharset != "utf-8") {
        PP.Diag(Tok, diag::warn_pragma_exec_charset_push_invalid) << ExecCharset;
        return;
      }
    }
    if (Callbacks)
      Callbacks->PragmaExecCharsetPush(DiagLoc, "UTF-8");
  } else if (II && II->isStr("pop")) {
    // #pragma execution_character_set( pop )
    PP.Lex(Tok);
    if (Callbacks)
      Callbacks->PragmaExecCharsetPop(DiagLoc);
  } else {
    PP.Diag(Tok, diag::warn_pragma_exec_charset_spec_invalid);
    return;
  }

  if (Tok.isNot(tok::r_paren)) {
    PP.Diag(Tok, diag::warn_pragma_exec_charset_expected) << ")";
    return;
  }

  PP.Lex(Tok);
  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma execution_character_set";
}
1576};

1578/// PragmaIncludeAliasHandler - "\#pragma include_alias("...")".
1579struct PragmaIncludeAliasHandler : public PragmaHandler {
PragmaIncludeAliasHandler() : PragmaHandler("include_alias") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &IncludeAliasTok) override {
  PP.HandlePragmaIncludeAlias(IncludeAliasTok);
}
1586};

1588/// PragmaMessageHandler - Handle the microsoft and gcc \#pragma message
1589/// extension.  The syntax is:
1590/// \code
1591///   #pragma message(string)
1592/// \endcode
1593/// OR, in GCC mode:
1594/// \code
1595///   #pragma message string
1596/// \endcode
1597/// string is a string, which is fully macro expanded, and permits string
1598/// concatenation, embedded escape characters, etc... See MSDN for more details.
1599/// Also handles \#pragma GCC warning and \#pragma GCC error which take the same
1600/// form as \#pragma message.
1601struct PragmaMessageHandler : public PragmaHandler {
1602private:
const PPCallbacks::PragmaMessageKind Kind;
const StringRef Namespace;

static const char* PragmaKind(PPCallbacks::PragmaMessageKind Kind,
                              bool PragmaNameOnly = false) {
  switch (Kind) {
    case PPCallbacks::PMK_Message:
      return PragmaNameOnly ? "message" : "pragma message";
    case PPCallbacks::PMK_Warning:
      return PragmaNameOnly ? "warning" : "pragma warning";
    case PPCallbacks::PMK_Error:
      return PragmaNameOnly ? "error" : "pragma error";
  }
  llvm_unreachable("Unknown PragmaMessageKind!")::llvm::llvm_unreachable_internal("Unknown PragmaMessageKind!"
, "clang/lib/Lex/Pragma.cpp", 1616);
}

1619public:
PragmaMessageHandler(PPCallbacks::PragmaMessageKind Kind,
                     StringRef Namespace = StringRef())
    : PragmaHandler(PragmaKind(Kind, true)), Kind(Kind),
      Namespace(Namespace) {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  SourceLocation MessageLoc = Tok.getLocation();
  PP.Lex(Tok);
  bool ExpectClosingParen = false;
  switch (Tok.getKind()) {
  case tok::l_paren:
    // We have a MSVC style pragma message.
    ExpectClosingParen = true;
    // Read the string.
    PP.Lex(Tok);
    break;
  case tok::string_literal:
    // We have a GCC style pragma message, and we just read the string.
    break;
  default:
    PP.Diag(MessageLoc, diag::err_pragma_message_malformed) << Kind;
    return;
  }

  std::string MessageString;
  if (!PP.FinishLexStringLiteral(Tok, MessageString, PragmaKind(Kind),
                                 /*AllowMacroExpansion=*/true))
    return;

  if (ExpectClosingParen) {
    if (Tok.isNot(tok::r_paren)) {
      PP.Diag(Tok.getLocation(), diag::err_pragma_message_malformed) << Kind;
      return;
    }
    PP.Lex(Tok);  // eat the r_paren.
  }

  if (Tok.isNot(tok::eod)) {
    PP.Diag(Tok.getLocation(), diag::err_pragma_message_malformed) << Kind;
    return;
  }

  // Output the message.
  PP.Diag(MessageLoc, (Kind == PPCallbacks::PMK_Error)
                        ? diag::err_pragma_message
                        : diag::warn_pragma_message) << MessageString;

  // If the pragma is lexically sound, notify any interested PPCallbacks.
  if (PPCallbacks *Callbacks = PP.getPPCallbacks())
    Callbacks->PragmaMessage(MessageLoc, Namespace, Kind, MessageString);
}
1672};

1674/// Handle the clang \#pragma module import extension. The syntax is:
1675/// \code
1676///   #pragma clang module import some.module.name
1677/// \endcode
1678struct PragmaModuleImportHandler : public PragmaHandler {
PragmaModuleImportHandler() : PragmaHandler("import") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  SourceLocation ImportLoc = Tok.getLocation();

  // Read the module name.
  llvm::SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 8>
      ModuleName;
  if (LexModuleName(PP, Tok, ModuleName))
    return;

  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  // If we have a non-empty module path, load the named module.
  Module *Imported =
      PP.getModuleLoader().loadModule(ImportLoc, ModuleName, Module::Hidden,
                                    /*IsInclusionDirective=*/false);
  if (!Imported)
    return;

  PP.makeModuleVisible(Imported, ImportLoc);
  PP.EnterAnnotationToken(SourceRange(ImportLoc, ModuleName.back().second),
                          tok::annot_module_include, Imported);
  if (auto *CB = PP.getPPCallbacks())
    CB->moduleImport(ImportLoc, ModuleName, Imported);
}
1707};

1709/// Handle the clang \#pragma module begin extension. The syntax is:
1710/// \code
1711///   #pragma clang module begin some.module.name
1712///   ...
1713///   #pragma clang module end
1714/// \endcode
1715struct PragmaModuleBeginHandler : public PragmaHandler {
PragmaModuleBeginHandler() : PragmaHandler("begin") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  SourceLocation BeginLoc = Tok.getLocation();

  // Read the module name.
  llvm::SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 8>
      ModuleName;
  if (LexModuleName(PP, Tok, ModuleName))
    return;

  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  // We can only enter submodules of the current module.
  StringRef Current = PP.getLangOpts().CurrentModule;
  if (ModuleName.front().first->getName() != Current) {
    PP.Diag(ModuleName.front().second, diag::err_pp_module_begin_wrong_module)
      << ModuleName.front().first << (ModuleName.size() > 1)
      << Current.empty() << Current;
    return;
  }

  // Find the module we're entering. We require that a module map for it
  // be loaded or implicitly loadable.
  auto &HSI = PP.getHeaderSearchInfo();
  Module *M = HSI.lookupModule(Current, ModuleName.front().second);
  if (!M) {
    PP.Diag(ModuleName.front().second,
            diag::err_pp_module_begin_no_module_map) << Current;
    return;
  }
  for (unsigned I = 1; I != ModuleName.size(); ++I) {
    auto *NewM = M->findOrInferSubmodule(ModuleName[I].first->getName());
    if (!NewM) {
      PP.Diag(ModuleName[I].second, diag::err_pp_module_begin_no_submodule)
        << M->getFullModuleName() << ModuleName[I].first;
      return;
    }
    M = NewM;
  }

  // If the module isn't available, it doesn't make sense to enter it.
  if (Preprocessor::checkModuleIsAvailable(
          PP.getLangOpts(), PP.getTargetInfo(), PP.getDiagnostics(), M)) {
    PP.Diag(BeginLoc, diag::note_pp_module_begin_here)
      << M->getTopLevelModuleName();
    return;
  }

  // Enter the scope of the submodule.
  PP.EnterSubmodule(M, BeginLoc, /*ForPragma*/true);
  PP.EnterAnnotationToken(SourceRange(BeginLoc, ModuleName.back().second),
                          tok::annot_module_begin, M);
}
1772};

1774/// Handle the clang \#pragma module end extension.
1775struct PragmaModuleEndHandler : public PragmaHandler {
PragmaModuleEndHandler() : PragmaHandler("end") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  SourceLocation Loc = Tok.getLocation();

  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  Module *M = PP.LeaveSubmodule(/*ForPragma*/true);
  if (M)
    PP.EnterAnnotationToken(SourceRange(Loc), tok::annot_module_end, M);
  else
    PP.Diag(Loc, diag::err_pp_module_end_without_module_begin);
}
1792};

1794/// Handle the clang \#pragma module build extension.
1795struct PragmaModuleBuildHandler : public PragmaHandler {
PragmaModuleBuildHandler() : PragmaHandler("build") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  PP.HandlePragmaModuleBuild(Tok);
}
1802};

1804/// Handle the clang \#pragma module load extension.
1805struct PragmaModuleLoadHandler : public PragmaHandler {
PragmaModuleLoadHandler() : PragmaHandler("load") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  SourceLocation Loc = Tok.getLocation();

  // Read the module name.
  llvm::SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 8>
      ModuleName;
  if (LexModuleName(PP, Tok, ModuleName))
    return;

  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  // Load the module, don't make it visible.
  PP.getModuleLoader().loadModule(Loc, ModuleName, Module::Hidden,
                                  /*IsInclusionDirective=*/false);
}
1825};

1827/// PragmaPushMacroHandler - "\#pragma push_macro" saves the value of the
1828/// macro on the top of the stack.
1829struct PragmaPushMacroHandler : public PragmaHandler {
PragmaPushMacroHandler() : PragmaHandler("push_macro") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &PushMacroTok) override {
  PP.HandlePragmaPushMacro(PushMacroTok);
}
1836};

1838/// PragmaPopMacroHandler - "\#pragma pop_macro" sets the value of the
1839/// macro to the value on the top of the stack.
1840struct PragmaPopMacroHandler : public PragmaHandler {
PragmaPopMacroHandler() : PragmaHandler("pop_macro") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &PopMacroTok) override {
  PP.HandlePragmaPopMacro(PopMacroTok);
}
1847};

1849/// PragmaARCCFCodeAuditedHandler -
1850///   \#pragma clang arc_cf_code_audited begin/end
1851struct PragmaARCCFCodeAuditedHandler : public PragmaHandler {
PragmaARCCFCodeAuditedHandler() : PragmaHandler("arc_cf_code_audited") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &NameTok) override {
  SourceLocation Loc = NameTok.getLocation();
  bool IsBegin;

  Token Tok;

  // Lex the 'begin' or 'end'.
  PP.LexUnexpandedToken(Tok);
  const IdentifierInfo *BeginEnd = Tok.getIdentifierInfo();
  if (BeginEnd && BeginEnd->isStr("begin")) {
    IsBegin = true;
  } else if (BeginEnd && BeginEnd->isStr("end")) {
    IsBegin = false;
  } else {
    PP.Diag(Tok.getLocation(), diag::err_pp_arc_cf_code_audited_syntax);
    return;
  }

  // Verify that this is followed by EOD.
  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  // The start location of the active audit.
  SourceLocation BeginLoc = PP.getPragmaARCCFCodeAuditedInfo().second;

  // The start location we want after processing this.
  SourceLocation NewLoc;

  if (IsBegin) {
    // Complain about attempts to re-enter an audit.
    if (BeginLoc.isValid()) {
      PP.Diag(Loc, diag::err_pp_double_begin_of_arc_cf_code_audited);
      PP.Diag(BeginLoc, diag::note_pragma_entered_here);
    }
    NewLoc = Loc;
  } else {
    // Complain about attempts to leave an audit that doesn't exist.
    if (!BeginLoc.isValid()) {
      PP.Diag(Loc, diag::err_pp_unmatched_end_of_arc_cf_code_audited);
      return;
    }
    NewLoc = SourceLocation();
  }

  PP.setPragmaARCCFCodeAuditedInfo(NameTok.getIdentifierInfo(), NewLoc);
}
1902};

1904/// PragmaAssumeNonNullHandler -
1905///   \#pragma clang assume_nonnull begin/end
1906struct PragmaAssumeNonNullHandler : public PragmaHandler {
PragmaAssumeNonNullHandler() : PragmaHandler("assume_nonnull") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &NameTok) override {
  SourceLocation Loc = NameTok.getLocation();
  bool IsBegin;

  Token Tok;

  // Lex the 'begin' or 'end'.
  PP.LexUnexpandedToken(Tok);
  const IdentifierInfo *BeginEnd = Tok.getIdentifierInfo();
  if (BeginEnd && BeginEnd->isStr("begin")) {
    IsBegin = true;
  } else if (BeginEnd && BeginEnd->isStr("end")) {
    IsBegin = false;
  } else {
    PP.Diag(Tok.getLocation(), diag::err_pp_assume_nonnull_syntax);
    return;
  }

  // Verify that this is followed by EOD.
  PP.LexUnexpandedToken(Tok);
  if (Tok.isNot(tok::eod))
    PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";

  // The start location of the active audit.
  SourceLocation BeginLoc = PP.getPragmaAssumeNonNullLoc();

  // The start location we want after processing this.
  SourceLocation NewLoc;
  PPCallbacks *Callbacks = PP.getPPCallbacks();

  if (IsBegin) {
    // Complain about attempts to re-enter an audit.
    if (BeginLoc.isValid()) {
      PP.Diag(Loc, diag::err_pp_double_begin_of_assume_nonnull);
      PP.Diag(BeginLoc, diag::note_pragma_entered_here);
    }
    NewLoc = Loc;
    if (Callbacks)
      Callbacks->PragmaAssumeNonNullBegin(NewLoc);
  } else {
    // Complain about attempts to leave an audit that doesn't exist.
    if (!BeginLoc.isValid()) {
      PP.Diag(Loc, diag::err_pp_unmatched_end_of_assume_nonnull);
      return;
    }
    NewLoc = SourceLocation();
    if (Callbacks)
      Callbacks->PragmaAssumeNonNullEnd(NewLoc);
  }

  PP.setPragmaAssumeNonNullLoc(NewLoc);
}
1962};

1964/// Handle "\#pragma region [...]"
1965///
1966/// The syntax is
1967/// \code
1968///   #pragma region [optional name]
1969///   #pragma endregion [optional comment]
1970/// \endcode
1971///
1972/// \note This is
1973/// <a href="http://msdn.microsoft.com/en-us/library/b6xkz944(v=vs.80).aspx">editor-only</a>
1974/// pragma, just skipped by compiler.
1975struct PragmaRegionHandler : public PragmaHandler {
PragmaRegionHandler(const char *pragma) : PragmaHandler(pragma) {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &NameTok) override {
  // #pragma region: endregion matches can be verified
  // __pragma(region): no sense, but ignored by msvc
  // _Pragma is not valid for MSVC, but there isn't any point
  // to handle a _Pragma differently.
}
1985};

1987/// "\#pragma managed"
1988/// "\#pragma managed(...)"
1989/// "\#pragma unmanaged"
1990/// MSVC ignores this pragma when not compiling using /clr, which clang doesn't
1991/// support. We parse it and ignore it to avoid -Wunknown-pragma warnings.
1992struct PragmaManagedHandler : public EmptyPragmaHandler {
PragmaManagedHandler(const char *pragma) : EmptyPragmaHandler(pragma) {}
1994};

1996/// This handles parsing pragmas that take a macro name and optional message
1997static IdentifierInfo *HandleMacroAnnotationPragma(Preprocessor &PP, Token &Tok,
                                                 const char *Pragma,
                                                 std::string &MessageString) {
PP.Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
  PP.Diag(Tok, diag::err_expected) << "(";
  return nullptr;
}

PP.LexUnexpandedToken(Tok);
if (!Tok.is(tok::identifier)) {
  PP.Diag(Tok, diag::err_expected) << tok::identifier;
  return nullptr;
}
IdentifierInfo *II = Tok.getIdentifierInfo();

if (!II->hasMacroDefinition()) {
  PP.Diag(Tok, diag::err_pp_visibility_non_macro) << II;
  return nullptr;
}

PP.Lex(Tok);
if (Tok.is(tok::comma)) {
  PP.Lex(Tok);
  if (!PP.FinishLexStringLiteral(Tok, MessageString, Pragma,
                                 /*AllowMacroExpansion=*/true))
    return nullptr;
}

if (Tok.isNot(tok::r_paren)) {
  PP.Diag(Tok, diag::err_expected) << ")";
  return nullptr;
}
return II;
2031}

2033/// "\#pragma clang deprecated(...)"
2034///
2035/// The syntax is
2036/// \code
2037///   #pragma clang deprecate(MACRO_NAME [, Message])
2038/// \endcode
2039struct PragmaDeprecatedHandler : public PragmaHandler {
PragmaDeprecatedHandler() : PragmaHandler("deprecated") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  std::string MessageString;

  if (IdentifierInfo *II = HandleMacroAnnotationPragma(
          PP, Tok, "#pragma clang deprecated", MessageString)) {
    II->setIsDeprecatedMacro(true);
    PP.addMacroDeprecationMsg(II, std::move(MessageString),
                              Tok.getLocation());
  }
}
2053};

2055/// "\#pragma clang restrict_expansion(...)"
2056///
2057/// The syntax is
2058/// \code
2059///   #pragma clang restrict_expansion(MACRO_NAME [, Message])
2060/// \endcode
2061struct PragmaRestrictExpansionHandler : public PragmaHandler {
PragmaRestrictExpansionHandler() : PragmaHandler("restrict_expansion") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  std::string MessageString;

  if (IdentifierInfo *II = HandleMacroAnnotationPragma(
          PP, Tok, "#pragma clang restrict_expansion", MessageString)) {
    II->setIsRestrictExpansion(true);
    PP.addRestrictExpansionMsg(II, std::move(MessageString),
                               Tok.getLocation());
  }
}
2075};

2077/// "\#pragma clang final(...)"
2078///
2079/// The syntax is
2080/// \code
2081///   #pragma clang final(MACRO_NAME)
2082/// \endcode
2083struct PragmaFinalHandler : public PragmaHandler {
PragmaFinalHandler() : PragmaHandler("final") {}

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                  Token &Tok) override {
  PP.Lex(Tok);
  if (Tok.isNot(tok::l_paren)) {
    PP.Diag(Tok, diag::err_expected) << "(";
    return;
  }

  PP.LexUnexpandedToken(Tok);
  if (!Tok.is(tok::identifier)) {
    PP.Diag(Tok, diag::err_expected) << tok::identifier;
    return;
  }
  IdentifierInfo *II = Tok.getIdentifierInfo();

  if (!II->hasMacroDefinition()) {
    PP.Diag(Tok, diag::err_pp_visibility_non_macro) << II;
    return;
  }

  PP.Lex(Tok);
  if (Tok.isNot(tok::r_paren)) {
    PP.Diag(Tok, diag::err_expected) << ")";
    return;
  }
  II->setIsFinal(true);
  PP.addFinalLoc(II, Tok.getLocation());
}
2114};

2116} // namespace

2118/// RegisterBuiltinPragmas - Install the standard preprocessor pragmas:
2119/// \#pragma GCC poison/system_header/dependency and \#pragma once.
2120void Preprocessor::RegisterBuiltinPragmas() {
AddPragmaHandler(new PragmaOnceHandler());
AddPragmaHandler(new PragmaMarkHandler());
AddPragmaHandler(new PragmaPushMacroHandler());
AddPragmaHandler(new PragmaPopMacroHandler());
AddPragmaHandler(new PragmaMessageHandler(PPCallbacks::PMK_Message));

// #pragma GCC ...
AddPragmaHandler("GCC", new PragmaPoisonHandler());
AddPragmaHandler("GCC", new PragmaSystemHeaderHandler());
AddPragmaHandler("GCC", new PragmaDependencyHandler());
AddPragmaHandler("GCC", new PragmaDiagnosticHandler("GCC"));
AddPragmaHandler("GCC", new PragmaMessageHandler(PPCallbacks::PMK_Warning,
                                                 "GCC"));
AddPragmaHandler("GCC", new PragmaMessageHandler(PPCallbacks::PMK_Error,
                                                 "GCC"));
// #pragma clang ...
AddPragmaHandler("clang", new PragmaPoisonHandler());
AddPragmaHandler("clang", new PragmaSystemHeaderHandler());
AddPragmaHandler("clang", new PragmaDebugHandler());
AddPragmaHandler("clang", new PragmaDependencyHandler());
AddPragmaHandler("clang", new PragmaDiagnosticHandler("clang"));
AddPragmaHandler("clang", new PragmaARCCFCodeAuditedHandler());
AddPragmaHandler("clang", new PragmaAssumeNonNullHandler());
AddPragmaHandler("clang", new PragmaDeprecatedHandler());
AddPragmaHandler("clang", new PragmaRestrictExpansionHandler());
AddPragmaHandler("clang", new PragmaFinalHandler());

// #pragma clang module ...
auto *ModuleHandler = new PragmaNamespace("module");
AddPragmaHandler("clang", ModuleHandler);
ModuleHandler->AddPragma(new PragmaModuleImportHandler());
ModuleHandler->AddPragma(new PragmaModuleBeginHandler());
ModuleHandler->AddPragma(new PragmaModuleEndHandler());
ModuleHandler->AddPragma(new PragmaModuleBuildHandler());
ModuleHandler->AddPragma(new PragmaModuleLoadHandler());

// Safe Buffers pragmas
AddPragmaHandler("clang", new PragmaUnsafeBufferUsageHandler);

// Add region pragmas.
AddPragmaHandler(new PragmaRegionHandler("region"));
AddPragmaHandler(new PragmaRegionHandler("endregion"));

// MS extensions.
if (LangOpts.MicrosoftExt) {
  AddPragmaHandler(new PragmaWarningHandler());
  AddPragmaHandler(new PragmaExecCharsetHandler());
  AddPragmaHandler(new PragmaIncludeAliasHandler());
  AddPragmaHandler(new PragmaHdrstopHandler());
  AddPragmaHandler(new PragmaSystemHeaderHandler());
  AddPragmaHandler(new PragmaManagedHandler("managed"));
  AddPragmaHandler(new PragmaManagedHandler("unmanaged"));
}

// Pragmas added by plugins
for (const PragmaHandlerRegistry::entry &handler :
     PragmaHandlerRegistry::entries()) {
  AddPragmaHandler(handler.instantiate().release());
}
2180}

2182/// Ignore all pragmas, useful for modes such as -Eonly which would otherwise
2183/// warn about those pragmas being unknown.
2184void Preprocessor::IgnorePragmas() {
AddPragmaHandler(new EmptyPragmaHandler());
// Also ignore all pragmas in all namespaces created
// in Preprocessor::RegisterBuiltinPragmas().
AddPragmaHandler("GCC", new EmptyPragmaHandler());
AddPragmaHandler("clang", new EmptyPragmaHandler());
2190}