gAlfonso-bit updated this revision to Diff 362398.
gAlfonso-bit added a comment.

Formatted ONLY the code I changed


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106899/new/

https://reviews.llvm.org/D106899

Files:
  clang-tools-extra/pp-trace/PPTrace.cpp
  clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
  flang/include/flang/Optimizer/Support/FatalError.h
  lldb/source/Host/posix/ProcessLauncherPosixFork.cpp
  lldb/source/Plugins/Process/Linux/SingleStepCheck.cpp
  llvm/include/llvm/MC/MCContext.h
  llvm/include/llvm/Support/Compiler.h
  llvm/include/llvm/Support/CrashRecoveryContext.h
  llvm/include/llvm/Support/Error.h
  llvm/include/llvm/Support/ErrorHandling.h
  llvm/include/llvm/Support/Process.h
  llvm/include/llvm/Support/Windows/WindowsSupport.h
  llvm/include/llvm/TableGen/Error.h
  llvm/lib/LTO/LTOBackend.cpp
  llvm/lib/Support/CrashRecoveryContext.cpp
  llvm/lib/Support/Process.cpp
  llvm/lib/Support/SmallVector.cpp
  llvm/lib/Support/Unix/Process.inc
  llvm/lib/Support/Unix/Unix.h
  llvm/lib/Support/Windows/Process.inc
  llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp
  llvm/lib/Transforms/Coroutines/Coroutines.cpp
  llvm/tools/llc/llc.cpp
  llvm/tools/lli/lli.cpp
  llvm/tools/llvm-ar/llvm-ar.cpp
  llvm/tools/llvm-cvtres/llvm-cvtres.cpp
  llvm/tools/llvm-cxxdump/llvm-cxxdump.cpp
  llvm/tools/llvm-ifs/ErrorCollector.cpp
  llvm/tools/llvm-ifs/ErrorCollector.h
  llvm/tools/llvm-lipo/llvm-lipo.cpp
  llvm/tools/llvm-mt/llvm-mt.cpp
  llvm/tools/llvm-objdump/llvm-objdump.cpp
  llvm/tools/llvm-objdump/llvm-objdump.h
  llvm/tools/llvm-profgen/ErrorHandling.h
  llvm/tools/llvm-rc/llvm-rc.cpp
  llvm/tools/llvm-readobj/llvm-readobj.cpp
  llvm/tools/llvm-readobj/llvm-readobj.h
  llvm/tools/llvm-strings/llvm-strings.cpp
  llvm/tools/split-file/split-file.cpp

Index: llvm/tools/split-file/split-file.cpp
===================================================================
--- llvm/tools/split-file/split-file.cpp
+++ llvm/tools/split-file/split-file.cpp
@@ -42,8 +42,7 @@
 static StringRef toolName;
 static int errorCount;
 
-LLVM_ATTRIBUTE_NORETURN static void fatal(StringRef filename,
-                                          const Twine &message) {
+[[noreturn]] static void fatal(StringRef filename, const Twine &message) {
   if (filename.empty())
     WithColor::error(errs(), toolName) << message << '\n';
   else
Index: llvm/tools/llvm-strings/llvm-strings.cpp
===================================================================
--- llvm/tools/llvm-strings/llvm-strings.cpp
+++ llvm/tools/llvm-strings/llvm-strings.cpp
@@ -73,7 +73,7 @@
 enum radix { none, octal, hexadecimal, decimal };
 static radix Radix;
 
-LLVM_ATTRIBUTE_NORETURN static void reportCmdLineError(const Twine &Message) {
+[[noreturn]] static void reportCmdLineError(const Twine &Message) {
   WithColor::error(errs(), ToolName) << Message << "\n";
   exit(1);
 }
Index: llvm/tools/llvm-readobj/llvm-readobj.h
===================================================================
--- llvm/tools/llvm-readobj/llvm-readobj.h
+++ llvm/tools/llvm-readobj/llvm-readobj.h
@@ -11,24 +11,24 @@
 
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
-#include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/Error.h"
+#include "llvm/Support/ErrorOr.h"
 #include <string>
 
 namespace llvm {
-  namespace object {
-    class RelocationRef;
-  }
-
-  // Various helper functions.
-  LLVM_ATTRIBUTE_NORETURN void reportError(Error Err, StringRef Input); 
-  void reportWarning(Error Err, StringRef Input);
-
-  template <class T> T unwrapOrError(StringRef Input, Expected<T> EO) {
-    if (EO)
-      return *EO;
-    reportError(EO.takeError(), Input);
-  }
+namespace object {
+class RelocationRef;
+}
+
+// Various helper functions.
+[[noreturn]] void reportError(Error Err, StringRef Input);
+void reportWarning(Error Err, StringRef Input);
+
+template <class T> T unwrapOrError(StringRef Input, Expected<T> EO) {
+  if (EO)
+    return *EO;
+  reportError(EO.takeError(), Input);
+}
 } // namespace llvm
 
 namespace opts {
@@ -43,10 +43,10 @@
 extern OutputStyleTy Output;
 } // namespace opts
 
-#define LLVM_READOBJ_ENUM_ENT(ns, enum) \
+#define LLVM_READOBJ_ENUM_ENT(ns, enum)                                        \
   { #enum, ns::enum }
 
-#define LLVM_READOBJ_ENUM_CLASS_ENT(enum_class, enum) \
-  { #enum, std::underlying_type<enum_class>::type(enum_class::enum) }
+#define LLVM_READOBJ_ENUM_CLASS_ENT(enum_class, enum)                          \
+  { #enum, std::underlying_type < enum_class> ::type(enum_class::enum) }
 
 #endif
Index: llvm/tools/llvm-readobj/llvm-readobj.cpp
===================================================================
--- llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -157,7 +157,7 @@
 
 namespace llvm {
 
-LLVM_ATTRIBUTE_NORETURN static void error(Twine Msg) {
+[[noreturn]] static void error(Twine Msg) {
   // Flush the standard output to print the error at a
   // proper place.
   fouts().flush();
@@ -165,7 +165,7 @@
   exit(1);
 }
 
-LLVM_ATTRIBUTE_NORETURN void reportError(Error Err, StringRef Input) {
+[[noreturn]] void reportError(Error Err, StringRef Input) {
   assert(Err);
   if (Input == "-")
     Input = "<stdin>";
@@ -499,7 +499,6 @@
     reportError(std::move(Err), WinRes->getFileName());
 }
 
-
 /// Opens \a File and dumps it.
 static void dumpInput(StringRef File, ScopedPrinter &Writer) {
   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
Index: llvm/tools/llvm-rc/llvm-rc.cpp
===================================================================
--- llvm/tools/llvm-rc/llvm-rc.cpp
+++ llvm/tools/llvm-rc/llvm-rc.cpp
@@ -111,7 +111,7 @@
 static FileRemover TempPreprocFile;
 static FileRemover TempResFile;
 
-LLVM_ATTRIBUTE_NORETURN static void fatalError(const Twine &Message) {
+[[noreturn]] static void fatalError(const Twine &Message) {
   errs() << Message << "\n";
   exit(1);
 }
Index: llvm/tools/llvm-profgen/ErrorHandling.h
===================================================================
--- llvm/tools/llvm-profgen/ErrorHandling.h
+++ llvm/tools/llvm-profgen/ErrorHandling.h
@@ -18,9 +18,9 @@
 
 using namespace llvm;
 
-LLVM_ATTRIBUTE_NORETURN inline void
-exitWithError(const Twine &Message, StringRef Whence = StringRef(),
-              StringRef Hint = StringRef()) {
+[[noreturn]] inline void exitWithError(const Twine &Message,
+                                       StringRef Whence = StringRef(),
+                                       StringRef Hint = StringRef()) {
   WithColor::error(errs(), "llvm-profgen");
   if (!Whence.empty())
     errs() << Whence.str() << ": ";
@@ -30,17 +30,17 @@
   ::exit(EXIT_FAILURE);
 }
 
-LLVM_ATTRIBUTE_NORETURN inline void
-exitWithError(std::error_code EC, StringRef Whence = StringRef()) {
+[[noreturn]] inline void exitWithError(std::error_code EC,
+                                       StringRef Whence = StringRef()) {
   exitWithError(EC.message(), Whence);
 }
 
-LLVM_ATTRIBUTE_NORETURN inline void exitWithError(Error E, StringRef Whence) {
+[[noreturn]] inline void exitWithError(Error E, StringRef Whence) {
   exitWithError(errorToErrorCode(std::move(E)), Whence);
 }
 
 template <typename T, typename... Ts>
-T unwrapOrError(Expected<T> EO, Ts &&... Args) {
+T unwrapOrError(Expected<T> EO, Ts &&...Args) {
   if (EO)
     return std::move(*EO);
   exitWithError(EO.takeError(), std::forward<Ts>(Args)...);
Index: llvm/tools/llvm-objdump/llvm-objdump.h
===================================================================
--- llvm/tools/llvm-objdump/llvm-objdump.h
+++ llvm/tools/llvm-objdump/llvm-objdump.h
@@ -139,14 +139,14 @@
 void printSymbol(const object::ObjectFile *O, const object::SymbolRef &Symbol,
                  StringRef FileName, StringRef ArchiveName,
                  StringRef ArchitectureName, bool DumpDynamic);
-LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, const Twine &Message);
-LLVM_ATTRIBUTE_NORETURN void reportError(Error E, StringRef FileName,
-                                         StringRef ArchiveName = "",
-                                         StringRef ArchitectureName = "");
+[[noreturn]] void reportError(StringRef File, const Twine &Message);
+[[noreturn]] void reportError(Error E, StringRef FileName,
+                              StringRef ArchiveName = "",
+                              StringRef ArchitectureName = "");
 void reportWarning(const Twine &Message, StringRef File);
 
 template <typename T, typename... Ts>
-T unwrapOrError(Expected<T> EO, Ts &&... Args) {
+T unwrapOrError(Expected<T> EO, Ts &&...Args) {
   if (EO)
     return std::move(*EO);
   reportError(EO.takeError(), std::forward<Ts>(Args)...);
Index: llvm/tools/llvm-objdump/llvm-objdump.cpp
===================================================================
--- llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -297,16 +297,15 @@
       << "'" << File << "': " << Message << "\n";
 }
 
-LLVM_ATTRIBUTE_NORETURN void objdump::reportError(StringRef File,
-                                                  const Twine &Message) {
+[[noreturn]] void objdump::reportError(StringRef File, const Twine &Message) {
   outs().flush();
   WithColor::error(errs(), ToolName) << "'" << File << "': " << Message << "\n";
   exit(1);
 }
 
-LLVM_ATTRIBUTE_NORETURN void objdump::reportError(Error E, StringRef FileName,
-                                                  StringRef ArchiveName,
-                                                  StringRef ArchitectureName) {
+[[noreturn]] void objdump::reportError(Error E, StringRef FileName,
+                                       StringRef ArchiveName,
+                                       StringRef ArchitectureName) {
   assert(E);
   outs().flush();
   WithColor::error(errs(), ToolName);
@@ -325,7 +324,7 @@
   WithColor::warning(errs(), ToolName) << Message << "\n";
 }
 
-LLVM_ATTRIBUTE_NORETURN static void reportCmdLineError(const Twine &Message) {
+[[noreturn]] static void reportCmdLineError(const Twine &Message) {
   WithColor::error(errs(), ToolName) << Message << "\n";
   exit(1);
 }
Index: llvm/tools/llvm-mt/llvm-mt.cpp
===================================================================
--- llvm/tools/llvm-mt/llvm-mt.cpp
+++ llvm/tools/llvm-mt/llvm-mt.cpp
@@ -64,7 +64,7 @@
 };
 } // namespace
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(Twine Msg) {
+[[noreturn]] static void reportError(Twine Msg) {
   WithColor::error(errs(), "llvm-mt") << Msg << '\n';
   exit(1);
 }
Index: llvm/tools/llvm-lipo/llvm-lipo.cpp
===================================================================
--- llvm/tools/llvm-lipo/llvm-lipo.cpp
+++ llvm/tools/llvm-lipo/llvm-lipo.cpp
@@ -36,13 +36,13 @@
 static const StringRef ToolName = "llvm-lipo";
 static LLVMContext LLVMCtx;
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(Twine Message) {
+[[noreturn]] static void reportError(Twine Message) {
   WithColor::error(errs(), ToolName) << Message << "\n";
   errs().flush();
   exit(EXIT_FAILURE);
 }
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(Error E) {
+[[noreturn]] static void reportError(Error E) {
   assert(E);
   std::string Buf;
   raw_string_ostream OS(Buf);
@@ -51,7 +51,7 @@
   reportError(Buf);
 }
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(StringRef File, Error E) {
+[[noreturn]] static void reportError(StringRef File, Error E) {
   assert(E);
   std::string Buf;
   raw_string_ostream OS(Buf);
@@ -328,11 +328,10 @@
         !B->isIR())
       reportError("File " + IF.FileName + " has unsupported binary format");
     if (IF.ArchType && (B->isMachO() || B->isArchive() || B->isIR())) {
-      const auto S = B->isMachO()
-                         ? Slice(*cast<MachOObjectFile>(B))
-                         : B->isArchive()
-                               ? createSliceFromArchive(*cast<Archive>(B))
-                               : createSliceFromIR(*cast<IRObjectFile>(B), 0);
+      const auto S = B->isMachO() ? Slice(*cast<MachOObjectFile>(B))
+                     : B->isArchive()
+                         ? createSliceFromArchive(*cast<Archive>(B))
+                         : createSliceFromIR(*cast<IRObjectFile>(B), 0);
       const auto SpecifiedCPUType = MachO::getCPUTypeFromArchitecture(
                                         MachO::getArchitectureFromName(
                                             Triple(*IF.ArchType).getArchName()))
@@ -350,9 +349,9 @@
   return InputBinaries;
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void verifyArch(ArrayRef<OwningBinary<Binary>> InputBinaries,
-                       ArrayRef<std::string> VerifyArchList) {
+[[noreturn]] static void
+verifyArch(ArrayRef<OwningBinary<Binary>> InputBinaries,
+           ArrayRef<std::string> VerifyArchList) {
   assert(!VerifyArchList.empty() &&
          "The list of architectures should be non-empty");
   assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
@@ -429,19 +428,19 @@
   Expected<Slice> SliceOrErr = createSliceFromIR(*IR, 0);
   if (!SliceOrErr)
     reportError(IR->getFileName(), SliceOrErr.takeError());
-  
+
   OS << SliceOrErr->getArchString() << " \n";
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void printArchs(ArrayRef<OwningBinary<Binary>> InputBinaries) {
+[[noreturn]] static void
+printArchs(ArrayRef<OwningBinary<Binary>> InputBinaries) {
   assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
   printBinaryArchs(InputBinaries.front().getBinary(), outs());
   exit(EXIT_SUCCESS);
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void printInfo(ArrayRef<OwningBinary<Binary>> InputBinaries) {
+[[noreturn]] static void
+printInfo(ArrayRef<OwningBinary<Binary>> InputBinaries) {
   // Group universal and thin files together for compatibility with cctools lipo
   for (auto &IB : InputBinaries) {
     const Binary *Binary = IB.getBinary();
@@ -463,9 +462,9 @@
   exit(EXIT_SUCCESS);
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void thinSlice(ArrayRef<OwningBinary<Binary>> InputBinaries,
-                      StringRef ArchType, StringRef OutputFileName) {
+[[noreturn]] static void thinSlice(ArrayRef<OwningBinary<Binary>> InputBinaries,
+                                   StringRef ArchType,
+                                   StringRef OutputFileName) {
   assert(!ArchType.empty() && "The architecture type should be non-empty");
   assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
   assert(!OutputFileName.empty() && "Thin expects a single output file");
@@ -599,10 +598,10 @@
   return Slices;
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void createUniversalBinary(ArrayRef<OwningBinary<Binary>> InputBinaries,
-                                  const StringMap<const uint32_t> &Alignments,
-                                  StringRef OutputFileName) {
+[[noreturn]] static void
+createUniversalBinary(ArrayRef<OwningBinary<Binary>> InputBinaries,
+                      const StringMap<const uint32_t> &Alignments,
+                      StringRef OutputFileName) {
   assert(InputBinaries.size() >= 1 && "Incorrect number of input binaries");
   assert(!OutputFileName.empty() && "Create expects a single output file");
 
@@ -619,12 +618,11 @@
   exit(EXIT_SUCCESS);
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void extractSlice(ArrayRef<OwningBinary<Binary>> InputBinaries,
-                         const StringMap<const uint32_t> &Alignments,
-                         StringRef ArchType, StringRef OutputFileName) {
-  assert(!ArchType.empty() &&
-         "The architecture type should be non-empty");
+[[noreturn]] static void
+extractSlice(ArrayRef<OwningBinary<Binary>> InputBinaries,
+             const StringMap<const uint32_t> &Alignments, StringRef ArchType,
+             StringRef OutputFileName) {
+  assert(!ArchType.empty() && "The architecture type should be non-empty");
   assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
   assert(!OutputFileName.empty() && "Thin expects a single output file");
 
@@ -642,9 +640,9 @@
   });
 
   if (Slices.empty())
-    reportError(
-        "fat input file " + InputBinaries.front().getBinary()->getFileName() +
-        " does not contain the specified architecture " + ArchType);
+    reportError("fat input file " +
+                InputBinaries.front().getBinary()->getFileName() +
+                " does not contain the specified architecture " + ArchType);
 
   llvm::stable_sort(Slices);
   if (Error E = writeUniversalBinary(Slices, OutputFileName))
@@ -678,11 +676,10 @@
   return Slices;
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void replaceSlices(ArrayRef<OwningBinary<Binary>> InputBinaries,
-                          const StringMap<const uint32_t> &Alignments,
-                          StringRef OutputFileName,
-                          ArrayRef<InputFile> ReplacementFiles) {
+[[noreturn]] static void
+replaceSlices(ArrayRef<OwningBinary<Binary>> InputBinaries,
+              const StringMap<const uint32_t> &Alignments,
+              StringRef OutputFileName, ArrayRef<InputFile> ReplacementFiles) {
   assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
   assert(!OutputFileName.empty() && "Replace expects a single output file");
 
Index: llvm/tools/llvm-ifs/ErrorCollector.h
===================================================================
--- llvm/tools/llvm-ifs/ErrorCollector.h
+++ llvm/tools/llvm-ifs/ErrorCollector.h
@@ -61,7 +61,7 @@
   bool allErrorsHandled() const;
 
   /// Dump output and crash.
-  LLVM_ATTRIBUTE_NORETURN void fatalUnhandledError();
+  [[noreturn]] void fatalUnhandledError();
 
   bool ErrorsAreFatal;
   std::vector<Error> Errors;
Index: llvm/tools/llvm-ifs/ErrorCollector.cpp
===================================================================
--- llvm/tools/llvm-ifs/ErrorCollector.cpp
+++ llvm/tools/llvm-ifs/ErrorCollector.cpp
@@ -57,7 +57,7 @@
   }
 }
 
-LLVM_ATTRIBUTE_NORETURN void ErrorCollector::fatalUnhandledError() {
+[[noreturn]] void ErrorCollector::fatalUnhandledError() {
   errs() << "Program aborted due to unhandled Error(s):\n";
   log(errs());
   errs() << "\n";
Index: llvm/tools/llvm-cxxdump/llvm-cxxdump.cpp
===================================================================
--- llvm/tools/llvm-cxxdump/llvm-cxxdump.cpp
+++ llvm/tools/llvm-cxxdump/llvm-cxxdump.cpp
@@ -49,7 +49,7 @@
   exit(1);
 }
 
-LLVM_ATTRIBUTE_NORETURN static void error(Error Err) {
+[[noreturn]] static void error(Error Err) {
   logAllUnhandledErrors(std::move(Err), WithColor::error(outs()),
                         "reading file: ");
   outs().flush();
Index: llvm/tools/llvm-cvtres/llvm-cvtres.cpp
===================================================================
--- llvm/tools/llvm-cvtres/llvm-cvtres.cpp
+++ llvm/tools/llvm-cvtres/llvm-cvtres.cpp
@@ -67,7 +67,7 @@
 };
 }
 
-static LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
+[[noreturn]] static void reportError(Twine Msg) {
   errs() << Msg;
   exit(1);
 }
Index: llvm/tools/llvm-ar/llvm-ar.cpp
===================================================================
--- llvm/tools/llvm-ar/llvm-ar.cpp
+++ llvm/tools/llvm-ar/llvm-ar.cpp
@@ -136,14 +136,14 @@
 static bool ParsingMRIScript;
 
 // Show the error plus the usage message, and exit.
-LLVM_ATTRIBUTE_NORETURN static void badUsage(Twine Error) {
+[[noreturn]] static void badUsage(Twine Error) {
   WithColor::error(errs(), ToolName) << Error << "\n";
   printHelpMessage();
   exit(1);
 }
 
 // Show the error message and exit.
-LLVM_ATTRIBUTE_NORETURN static void fail(Twine Error) {
+[[noreturn]] static void fail(Twine Error) {
   if (ParsingMRIScript) {
     WithColor::error(errs(), ToolName)
         << "script line " << MRILineNumber << ": " << Error << "\n";
Index: llvm/tools/lli/lli.cpp
===================================================================
--- llvm/tools/lli/lli.cpp
+++ llvm/tools/lli/lli.cpp
@@ -410,8 +410,7 @@
   llvm_unreachable("Unrecognized opt level.");
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void reportError(SMDiagnostic Err, const char *ProgName) {
+[[noreturn]] static void reportError(SMDiagnostic Err, const char *ProgName) {
   Err.print(ProgName, errs());
   exit(1);
 }
Index: llvm/tools/llc/llc.cpp
===================================================================
--- llvm/tools/llc/llc.cpp
+++ llvm/tools/llc/llc.cpp
@@ -201,8 +201,7 @@
 
 static int compileModule(char **, LLVMContext &);
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(Twine Msg,
-                                                StringRef Filename = "") {
+[[noreturn]] static void reportError(Twine Msg, StringRef Filename = "") {
   SmallString<256> Prefix;
   if (!Filename.empty()) {
     if (Filename == "-")
@@ -213,7 +212,7 @@
   exit(1);
 }
 
-LLVM_ATTRIBUTE_NORETURN static void reportError(Error Err, StringRef Filename) {
+[[noreturn]] static void reportError(Error Err, StringRef Filename) {
   assert(Err);
   handleAllErrors(createFileError(Filename, std::move(Err)),
                   [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
Index: llvm/lib/Transforms/Coroutines/Coroutines.cpp
===================================================================
--- llvm/lib/Transforms/Coroutines/Coroutines.cpp
+++ llvm/lib/Transforms/Coroutines/Coroutines.cpp
@@ -571,8 +571,8 @@
   llvm_unreachable("Unknown coro::ABI enum");
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void fail(const Instruction *I, const char *Reason, Value *V) {
+[[noreturn]] static void fail(const Instruction *I, const char *Reason,
+                              Value *V) {
 #ifndef NDEBUG
   I->dump();
   if (V) {
Index: llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp
===================================================================
--- llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp
+++ llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp
@@ -448,8 +448,7 @@
   ++MCNumEmitted;
 }
 
-LLVM_ATTRIBUTE_NORETURN
-static void raise_relocation_error(unsigned Width, unsigned Kind) {
+[[noreturn]] static void raise_relocation_error(unsigned Width, unsigned Kind) {
   std::string Text;
   raw_string_ostream Stream(Text);
   Stream << "Unrecognized relocation combination: width=" << Width
Index: llvm/lib/Support/Windows/Process.inc
===================================================================
--- llvm/lib/Support/Windows/Process.inc
+++ llvm/lib/Support/Windows/Process.inc
@@ -504,8 +504,7 @@
   return GetWindowsOSVersion() >= llvm::VersionTuple(6, 2, 0, 0);
 }
 
-LLVM_ATTRIBUTE_NORETURN
-void Process::ExitNoCleanup(int RetCode) {
+[[noreturn]] void Process::ExitNoCleanup(int RetCode) {
   TerminateProcess(GetCurrentProcess(), RetCode);
   llvm_unreachable("TerminateProcess doesn't return");
 }
Index: llvm/lib/Support/Unix/Unix.h
===================================================================
--- llvm/lib/Support/Unix/Unix.h
+++ llvm/lib/Support/Unix/Unix.h
@@ -67,8 +67,7 @@
 }
 
 // Include StrError(errnum) in a fatal error message.
-LLVM_ATTRIBUTE_NORETURN static inline void ReportErrnumFatal(const char *Msg,
-                                                             int errnum) {
+[[noreturn]] static inline void ReportErrnumFatal(const char *Msg, int errnum) {
   std::string ErrMsg;
   MakeErrMsg(&ErrMsg, Msg, errnum);
   llvm::report_fatal_error(ErrMsg);
Index: llvm/lib/Support/Unix/Process.inc
===================================================================
--- llvm/lib/Support/Unix/Process.inc
+++ llvm/lib/Support/Unix/Process.inc
@@ -461,5 +461,4 @@
 #endif
 }
 
-LLVM_ATTRIBUTE_NORETURN
-void Process::ExitNoCleanup(int RetCode) { _Exit(RetCode); }
+[[noreturn]] void Process::ExitNoCleanup(int RetCode) { _Exit(RetCode); }
Index: llvm/lib/Support/SmallVector.cpp
===================================================================
--- llvm/lib/Support/SmallVector.cpp
+++ llvm/lib/Support/SmallVector.cpp
@@ -47,8 +47,7 @@
 
 /// Report that MinSize doesn't fit into this vector's size type. Throws
 /// std::length_error or calls report_fatal_error.
-LLVM_ATTRIBUTE_NORETURN
-static void report_size_overflow(size_t MinSize, size_t MaxSize);
+[[noreturn]] static void report_size_overflow(size_t MinSize, size_t MaxSize);
 static void report_size_overflow(size_t MinSize, size_t MaxSize) {
   std::string Reason = "SmallVector unable to grow. Requested capacity (" +
                        std::to_string(MinSize) +
@@ -63,7 +62,7 @@
 
 /// Report that this vector is already at maximum capacity. Throws
 /// std::length_error or calls report_fatal_error.
-LLVM_ATTRIBUTE_NORETURN static void report_at_maximum_capacity(size_t MaxSize);
+[[noreturn]] static void report_at_maximum_capacity(size_t MaxSize);
 static void report_at_maximum_capacity(size_t MaxSize) {
   std::string Reason =
       "SmallVector capacity unable to grow. Already at maximum size " +
Index: llvm/lib/Support/Process.cpp
===================================================================
--- llvm/lib/Support/Process.cpp
+++ llvm/lib/Support/Process.cpp
@@ -92,8 +92,7 @@
 
 bool Process::AreCoreFilesPrevented() { return coreFilesPrevented; }
 
-LLVM_ATTRIBUTE_NORETURN
-void Process::Exit(int RetCode, bool NoCleanup) {
+[[noreturn]] void Process::Exit(int RetCode, bool NoCleanup) {
   if (CrashRecoveryContext *CRC = CrashRecoveryContext::GetCurrent())
     CRC->HandleExit(RetCode);
 
Index: llvm/lib/Support/CrashRecoveryContext.cpp
===================================================================
--- llvm/lib/Support/CrashRecoveryContext.cpp
+++ llvm/lib/Support/CrashRecoveryContext.cpp
@@ -428,8 +428,7 @@
 
 #endif // !_MSC_VER
 
-LLVM_ATTRIBUTE_NORETURN
-void CrashRecoveryContext::HandleExit(int RetCode) {
+[[noreturn]] void CrashRecoveryContext::HandleExit(int RetCode) {
 #if defined(_WIN32)
   // SEH and VEH
   ::RaiseException(0xE0000000 | RetCode, 0, 0, NULL);
Index: llvm/lib/LTO/LTOBackend.cpp
===================================================================
--- llvm/lib/LTO/LTOBackend.cpp
+++ llvm/lib/LTO/LTOBackend.cpp
@@ -74,7 +74,7 @@
     cl::desc("Assume the input has already undergone ThinLTO function "
              "importing and the other pre-optimization pipeline changes."));
 
-LLVM_ATTRIBUTE_NORETURN static void reportOpenError(StringRef Path, Twine Msg) {
+[[noreturn]] static void reportOpenError(StringRef Path, Twine Msg) {
   errs() << "failed to open " << Path << ": " << Msg << '\n';
   errs().flush();
   exit(1);
Index: llvm/include/llvm/TableGen/Error.h
===================================================================
--- llvm/include/llvm/TableGen/Error.h
+++ llvm/include/llvm/TableGen/Error.h
@@ -22,13 +22,10 @@
 void PrintNote(const Twine &Msg);
 void PrintNote(ArrayRef<SMLoc> NoteLoc, const Twine &Msg);
 
-LLVM_ATTRIBUTE_NORETURN void PrintFatalNote(const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalNote(ArrayRef<SMLoc> ErrorLoc,
-                                            const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalNote(const Record *Rec,
-                                            const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalNote(const RecordVal *RecVal,
-                                            const Twine &Msg);
+[[noreturn]] void PrintFatalNote(const Twine &Msg);
+[[noreturn]] void PrintFatalNote(ArrayRef<SMLoc> ErrorLoc, const Twine &Msg);
+[[noreturn]] void PrintFatalNote(const Record *Rec, const Twine &Msg);
+[[noreturn]] void PrintFatalNote(const RecordVal *RecVal, const Twine &Msg);
 
 void PrintWarning(const Twine &Msg);
 void PrintWarning(ArrayRef<SMLoc> WarningLoc, const Twine &Msg);
@@ -40,13 +37,10 @@
 void PrintError(const Record *Rec, const Twine &Msg);
 void PrintError(const RecordVal *RecVal, const Twine &Msg);
 
-LLVM_ATTRIBUTE_NORETURN void PrintFatalError(const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalError(ArrayRef<SMLoc> ErrorLoc,
-                                             const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalError(const Record *Rec,
-                                             const Twine &Msg);
-LLVM_ATTRIBUTE_NORETURN void PrintFatalError(const RecordVal *RecVal,
-                                             const Twine &Msg);
+[[noreturn]] void PrintFatalError(const Twine &Msg);
+[[noreturn]] void PrintFatalError(ArrayRef<SMLoc> ErrorLoc, const Twine &Msg);
+[[noreturn]] void PrintFatalError(const Record *Rec, const Twine &Msg);
+[[noreturn]] void PrintFatalError(const RecordVal *RecVal, const Twine &Msg);
 
 void CheckAssert(SMLoc Loc, Init *Condition, Init *Message);
 
Index: llvm/include/llvm/Support/Windows/WindowsSupport.h
===================================================================
--- llvm/include/llvm/Support/Windows/WindowsSupport.h
+++ llvm/include/llvm/Support/Windows/WindowsSupport.h
@@ -68,7 +68,7 @@
 bool MakeErrMsg(std::string *ErrMsg, const std::string &prefix);
 
 // Include GetLastError() in a fatal error message.
-LLVM_ATTRIBUTE_NORETURN inline void ReportLastErrorFatal(const char *Msg) {
+[[noreturn]] inline void ReportLastErrorFatal(const char *Msg) {
   std::string ErrMsg;
   MakeErrMsg(&ErrMsg, Msg);
   llvm::report_fatal_error(ErrMsg);
Index: llvm/include/llvm/Support/Process.h
===================================================================
--- llvm/include/llvm/Support/Process.h
+++ llvm/include/llvm/Support/Process.h
@@ -214,12 +214,10 @@
   /// In that case, the control flow will resume after RunSafely(), like for a
   /// crash, rather than exiting the current process.
   /// Use \arg NoCleanup for calling _exit() instead of exit().
-  LLVM_ATTRIBUTE_NORETURN
-  static void Exit(int RetCode, bool NoCleanup = false);
+  [[noreturn]] static void Exit(int RetCode, bool NoCleanup = false);
 
 private:
-  LLVM_ATTRIBUTE_NORETURN
-  static void ExitNoCleanup(int RetCode);
+  [[noreturn]] static void ExitNoCleanup(int RetCode);
 };
 
 }
Index: llvm/include/llvm/Support/ErrorHandling.h
===================================================================
--- llvm/include/llvm/Support/ErrorHandling.h
+++ llvm/include/llvm/Support/ErrorHandling.h
@@ -19,46 +19,46 @@
 
 namespace llvm {
 class StringRef;
-  class Twine;
-
-  /// An error handler callback.
-  typedef void (*fatal_error_handler_t)(void *user_data,
-                                        const std::string& reason,
-                                        bool gen_crash_diag);
-
-  /// install_fatal_error_handler - Installs a new error handler to be used
-  /// whenever a serious (non-recoverable) error is encountered by LLVM.
-  ///
-  /// If no error handler is installed the default is to print the error message
-  /// to stderr, and call exit(1).  If an error handler is installed then it is
-  /// the handler's responsibility to log the message, it will no longer be
-  /// printed to stderr.  If the error handler returns, then exit(1) will be
-  /// called.
-  ///
-  /// It is dangerous to naively use an error handler which throws an exception.
-  /// Even though some applications desire to gracefully recover from arbitrary
-  /// faults, blindly throwing exceptions through unfamiliar code isn't a way to
-  /// achieve this.
-  ///
-  /// \param user_data - An argument which will be passed to the install error
-  /// handler.
-  void install_fatal_error_handler(fatal_error_handler_t handler,
-                                   void *user_data = nullptr);
-
-  /// Restores default error handling behaviour.
-  void remove_fatal_error_handler();
-
-  /// ScopedFatalErrorHandler - This is a simple helper class which just
-  /// calls install_fatal_error_handler in its constructor and
-  /// remove_fatal_error_handler in its destructor.
-  struct ScopedFatalErrorHandler {
-    explicit ScopedFatalErrorHandler(fatal_error_handler_t handler,
-                                     void *user_data = nullptr) {
-      install_fatal_error_handler(handler, user_data);
-    }
-
-    ~ScopedFatalErrorHandler() { remove_fatal_error_handler(); }
-  };
+class Twine;
+
+/// An error handler callback.
+typedef void (*fatal_error_handler_t)(void *user_data,
+                                      const std::string &reason,
+                                      bool gen_crash_diag);
+
+/// install_fatal_error_handler - Installs a new error handler to be used
+/// whenever a serious (non-recoverable) error is encountered by LLVM.
+///
+/// If no error handler is installed the default is to print the error message
+/// to stderr, and call exit(1).  If an error handler is installed then it is
+/// the handler's responsibility to log the message, it will no longer be
+/// printed to stderr.  If the error handler returns, then exit(1) will be
+/// called.
+///
+/// It is dangerous to naively use an error handler which throws an exception.
+/// Even though some applications desire to gracefully recover from arbitrary
+/// faults, blindly throwing exceptions through unfamiliar code isn't a way to
+/// achieve this.
+///
+/// \param user_data - An argument which will be passed to the install error
+/// handler.
+void install_fatal_error_handler(fatal_error_handler_t handler,
+                                 void *user_data = nullptr);
+
+/// Restores default error handling behaviour.
+void remove_fatal_error_handler();
+
+/// ScopedFatalErrorHandler - This is a simple helper class which just
+/// calls install_fatal_error_handler in its constructor and
+/// remove_fatal_error_handler in its destructor.
+struct ScopedFatalErrorHandler {
+  explicit ScopedFatalErrorHandler(fatal_error_handler_t handler,
+                                   void *user_data = nullptr) {
+    install_fatal_error_handler(handler, user_data);
+  }
+
+  ~ScopedFatalErrorHandler() { remove_fatal_error_handler(); }
+};
 
 /// Reports a serious error, calling any installed error handler. These
 /// functions are intended to be used for error conditions which are outside
@@ -68,14 +68,14 @@
 /// standard error, followed by a newline.
 /// After the error handler is called this function will call abort(), it
 /// does not return.
-LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const char *reason,
-                                                bool gen_crash_diag = true);
-LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const std::string &reason,
-                                                bool gen_crash_diag = true);
-LLVM_ATTRIBUTE_NORETURN void report_fatal_error(StringRef reason,
-                                                bool gen_crash_diag = true);
-LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const Twine &reason,
-                                                bool gen_crash_diag = true);
+[[noreturn]] void report_fatal_error(const char *reason,
+                                     bool gen_crash_diag = true);
+[[noreturn]] void report_fatal_error(const std::string &reason,
+                                     bool gen_crash_diag = true);
+[[noreturn]] void report_fatal_error(StringRef reason,
+                                     bool gen_crash_diag = true);
+[[noreturn]] void report_fatal_error(const Twine &reason,
+                                     bool gen_crash_diag = true);
 
 /// Installs a new bad alloc error handler that should be used whenever a
 /// bad alloc error, e.g. failing malloc/calloc, is encountered by LLVM.
@@ -113,16 +113,16 @@
 /// If no error handler is installed (default), throws a bad_alloc exception
 /// if LLVM is compiled with exception support. Otherwise prints the error
 /// to standard error and calls abort().
-LLVM_ATTRIBUTE_NORETURN void report_bad_alloc_error(const char *Reason,
-                                                    bool GenCrashDiag = true);
+[[noreturn]] void report_bad_alloc_error(const char *Reason,
+                                         bool GenCrashDiag = true);
 
 /// This function calls abort(), and prints the optional message to stderr.
 /// Use the llvm_unreachable macro (that adds location info), instead of
 /// calling this function directly.
-LLVM_ATTRIBUTE_NORETURN void
-llvm_unreachable_internal(const char *msg = nullptr, const char *file = nullptr,
-                          unsigned line = 0);
-}
+[[noreturn]] void llvm_unreachable_internal(const char *msg = nullptr,
+                                            const char *file = nullptr,
+                                            unsigned line = 0);
+} // namespace llvm
 
 /// Marks that the current location is not supposed to be reachable.
 /// In !NDEBUG builds, prints the message and location info to stderr.
@@ -133,7 +133,7 @@
 /// Use this instead of assert(0).  It conveys intent more clearly and
 /// allows compilers to omit some unnecessary code.
 #ifndef NDEBUG
-#define llvm_unreachable(msg) \
+#define llvm_unreachable(msg)                                                  \
   ::llvm::llvm_unreachable_internal(msg, __FILE__, __LINE__)
 #elif defined(LLVM_BUILTIN_UNREACHABLE)
 #define llvm_unreachable(msg) LLVM_BUILTIN_UNREACHABLE
Index: llvm/include/llvm/Support/Error.h
===================================================================
--- llvm/include/llvm/Support/Error.h
+++ llvm/include/llvm/Support/Error.h
@@ -257,8 +257,7 @@
   // of debug prints can cause the function to be too large for inlining.  So
   // it's important that we define this function out of line so that it can't be
   // inlined.
-  LLVM_ATTRIBUTE_NORETURN
-  void fatalUncheckedError() const;
+  [[noreturn]] void fatalUncheckedError() const;
 #endif
 
   void assertIsChecked() {
@@ -688,9 +687,7 @@
   }
 
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
-  LLVM_ATTRIBUTE_NORETURN
-  LLVM_ATTRIBUTE_NOINLINE
-  void fatalUncheckedExpected() const {
+  [[noreturn]] LLVM_ATTRIBUTE_NOINLINE void fatalUncheckedExpected() const {
     dbgs() << "Expected<T> must be checked before access or destruction.\n";
     if (HasError) {
       dbgs() << "Unchecked Expected<T> contained error:\n";
@@ -722,8 +719,7 @@
 
 /// Report a serious error, calling any installed error handler. See
 /// ErrorHandling.h.
-LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err,
-                                                bool gen_crash_diag = true);
+[[noreturn]] void report_fatal_error(Error Err, bool gen_crash_diag = true);
 
 /// Report a fatal error if Err is a failure value.
 ///
Index: llvm/include/llvm/Support/CrashRecoveryContext.h
===================================================================
--- llvm/include/llvm/Support/CrashRecoveryContext.h
+++ llvm/include/llvm/Support/CrashRecoveryContext.h
@@ -99,8 +99,7 @@
 
   /// Explicitly trigger a crash recovery in the current process, and
   /// return failure from RunSafely(). This function does not return.
-  LLVM_ATTRIBUTE_NORETURN
-  void HandleExit(int RetCode);
+  [[noreturn]] void HandleExit(int RetCode);
 
   /// Throw again a signal or an exception, after it was catched once by a
   /// CrashRecoveryContext.
Index: llvm/include/llvm/Support/Compiler.h
===================================================================
--- llvm/include/llvm/Support/Compiler.h
+++ llvm/include/llvm/Support/Compiler.h
@@ -242,14 +242,6 @@
 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline
 #endif
 
-#ifdef __GNUC__
-#define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
-#elif defined(_MSC_VER)
-#define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
-#else
-#define LLVM_ATTRIBUTE_NORETURN
-#endif
-
 #if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
 #elif defined(_MSC_VER)
Index: llvm/include/llvm/MC/MCContext.h
===================================================================
--- llvm/include/llvm/MC/MCContext.h
+++ llvm/include/llvm/MC/MCContext.h
@@ -817,7 +817,7 @@
     // Unrecoverable error has occurred. Display the best diagnostic we can
     // and bail via exit(1). For now, most MC backend errors are unrecoverable.
     // FIXME: We should really do something about that.
-    LLVM_ATTRIBUTE_NORETURN void reportFatalError(SMLoc L, const Twine &Msg);
+    [[noreturn]] void reportFatalError(SMLoc L, const Twine &Msg);
 
     const MCAsmMacro *lookupMacro(StringRef Name) {
       StringMap<MCAsmMacro>::iterator I = MacroMap.find(Name);
Index: lldb/source/Plugins/Process/Linux/SingleStepCheck.cpp
===================================================================
--- lldb/source/Plugins/Process/Linux/SingleStepCheck.cpp
+++ lldb/source/Plugins/Process/Linux/SingleStepCheck.cpp
@@ -29,7 +29,7 @@
 #if defined(__arm64__) || defined(__aarch64__)
 namespace {
 
-void LLVM_ATTRIBUTE_NORETURN Child() {
+[[noreturn]] void Child() {
   if (ptrace(PTRACE_TRACEME, 0, nullptr, nullptr) == -1)
     _exit(1);
 
Index: lldb/source/Host/posix/ProcessLauncherPosixFork.cpp
===================================================================
--- lldb/source/Host/posix/ProcessLauncherPosixFork.cpp
+++ lldb/source/Host/posix/ProcessLauncherPosixFork.cpp
@@ -46,8 +46,7 @@
 #endif
 }
 
-static void LLVM_ATTRIBUTE_NORETURN ExitWithError(int error_fd,
-                                                  const char *operation) {
+[[noreturn]] static void ExitWithError(int error_fd, const char *operation) {
   int err = errno;
   llvm::raw_fd_ostream os(error_fd, true);
   os << operation << " failed: " << llvm::sys::StrError(err);
@@ -88,7 +87,7 @@
   return;
 }
 
-static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd,
+[[noreturn]] static void ChildFunc(int error_fd,
                                               const ProcessLaunchInfo &info) {
   if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) {
     if (setpgid(0, 0) != 0)
Index: flang/include/flang/Optimizer/Support/FatalError.h
===================================================================
--- flang/include/flang/Optimizer/Support/FatalError.h
+++ flang/include/flang/Optimizer/Support/FatalError.h
@@ -20,8 +20,8 @@
 
 /// Fatal error reporting helper. Report a fatal error with a source location
 /// and immediately abort flang.
-LLVM_ATTRIBUTE_NORETURN inline void emitFatalError(mlir::Location loc,
-                                                   const llvm::Twine &message) {
+[[noreturn]] inline void emitFatalError(mlir::Location loc,
+                                        const llvm::Twine &message) {
   mlir::emitError(loc, message);
   llvm::report_fatal_error("aborting");
 }
Index: clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
===================================================================
--- clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -614,7 +614,7 @@
     return It->second.Root;
   }
 
-  LLVM_ATTRIBUTE_NORETURN void PrintFatalError(llvm::Twine const &Msg) const {
+  [[noreturn]] void PrintFatalError(llvm::Twine const &Msg) const {
     assert(EvaluatingRecord && "not evaluating a record?");
     llvm::PrintFatalError(EvaluatingRecord->getLoc(), Msg);
   }
Index: clang-tools-extra/pp-trace/PPTrace.cpp
===================================================================
--- clang-tools-extra/pp-trace/PPTrace.cpp
+++ clang-tools-extra/pp-trace/PPTrace.cpp
@@ -69,7 +69,7 @@
     cl::desc("Output trace to the given file name or '-' for stdout."),
     cl::cat(Cat));
 
-LLVM_ATTRIBUTE_NORETURN static void error(Twine Message) {
+[[noreturn]] static void error(Twine Message) {
   WithColor::error() << Message << '\n';
   exit(1);
 }
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