[clang] Use true/false instead of 1/0 (NFC)

Identified with modernize-use-bool-literals.

41 files changed, 95 insertions, 95 deletions

diff --git a/clang/include/clang/AST/DeclCXX.h b/clang/include/clang/AST/DeclCXX.h
index cc7bfc86a521..309a60f43e4f 100644
--- a/clang/include/clang/AST/DeclCXX.h
+++ b/clang/include/clang/AST/DeclCXX.h
@@ -3291,7 +3291,7 @@ class BaseUsingDecl : public NamedDecl {
 
 protected:
   BaseUsingDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N)
-      : NamedDecl(DK, DC, L, N), FirstUsingShadow(nullptr, 0) {}
+      : NamedDecl(DK, DC, L, N), FirstUsingShadow(nullptr, false) {}
 
 private:
   void anchor() override;
diff --git a/clang/include/clang/AST/DeclContextInternals.h b/clang/include/clang/AST/DeclContextInternals.h
index 9899fc29b82d..903cdb7bfcc8 100644
--- a/clang/include/clang/AST/DeclContextInternals.h
+++ b/clang/include/clang/AST/DeclContextInternals.h
@@ -90,7 +90,7 @@ public:
 
   StoredDeclsList(StoredDeclsList &&RHS) : Data(RHS.Data) {
     RHS.Data.setPointer(nullptr);
-    RHS.Data.setInt(0);
+    RHS.Data.setInt(false);
   }
 
   void MaybeDeallocList() {
@@ -114,7 +114,7 @@ public:
 
     Data = RHS.Data;
     RHS.Data.setPointer(nullptr);
-    RHS.Data.setInt(0);
+    RHS.Data.setInt(false);
     return *this;
   }
 
@@ -142,7 +142,7 @@ public:
   }
 
   void setHasExternalDecls() {
-    Data.setInt(1);
+    Data.setInt(true);
   }
 
   void remove(NamedDecl *D) {
@@ -155,7 +155,7 @@ public:
     erase_if([](NamedDecl *ND) { return ND->isFromASTFile(); });
 
     // Don't have any pending external decls any more.
-    Data.setInt(0);
+    Data.setInt(false);
   }
 
   void replaceExternalDecls(ArrayRef<NamedDecl*> Decls) {
@@ -171,7 +171,7 @@ public:
     });
 
     // Don't have any pending external decls any more.
-    Data.setInt(0);
+    Data.setInt(false);
 
     if (Decls.empty())
       return;
diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
index f7a2e3146d06..d216b359816e 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -498,7 +498,7 @@ private:
       TemplateSpecializationKind TSK, const TemplateArgumentList *TemplateArgs,
       const ASTTemplateArgumentListInfo *TemplateArgsAsWritten,
       SourceLocation POI, MemberSpecializationInfo *MSInfo)
-      : Function(FD, MSInfo ? 1 : 0), Template(Template, TSK - 1),
+      : Function(FD, MSInfo ? true : false), Template(Template, TSK - 1),
         TemplateArguments(TemplateArgs),
         TemplateArgumentsAsWritten(TemplateArgsAsWritten),
         PointOfInstantiation(POI) {
diff --git a/clang/include/clang/AST/ExprConcepts.h b/clang/include/clang/AST/ExprConcepts.h
index 1544c498ef66..d56d42765870 100644
--- a/clang/include/clang/AST/ExprConcepts.h
+++ b/clang/include/clang/AST/ExprConcepts.h
@@ -275,12 +275,12 @@ public:
       friend ASTStmtWriter;
 
       /// \brief No return type requirement was specified.
-      ReturnTypeRequirement() : TypeConstraintInfo(nullptr, 0) {}
+      ReturnTypeRequirement() : TypeConstraintInfo(nullptr, false) {}
 
       /// \brief A return type requirement was specified but it was a
       /// substitution failure.
       ReturnTypeRequirement(SubstitutionDiagnostic *SubstDiag) :
-          TypeConstraintInfo(SubstDiag, 0) {}
+          TypeConstraintInfo(SubstDiag, false) {}
 
       /// \brief A 'type constraint' style return type requirement.
       /// \param TPL an invented template parameter list containing a single
diff --git a/clang/include/clang/AST/FormatString.h b/clang/include/clang/AST/FormatString.h
index a1271f920ae6..5a407b926192 100644
--- a/clang/include/clang/AST/FormatString.h
+++ b/clang/include/clang/AST/FormatString.h
@@ -332,11 +332,11 @@ public:
                  unsigned amountLength,
                  bool usesPositionalArg)
   : start(amountStart), length(amountLength), hs(howSpecified), amt(amount),
-  UsesPositionalArg(usesPositionalArg), UsesDotPrefix(0) {}
+  UsesPositionalArg(usesPositionalArg), UsesDotPrefix(false) {}
 
   OptionalAmount(bool valid = true)
   : start(nullptr),length(0), hs(valid ? NotSpecified : Invalid), amt(0),
-  UsesPositionalArg(0), UsesDotPrefix(0) {}
+  UsesPositionalArg(false), UsesDotPrefix(false) {}
 
   explicit OptionalAmount(unsigned Amount)
     : start(nullptr), length(0), hs(Constant), amt(Amount),
diff --git a/clang/lib/ARCMigrate/Transforms.cpp b/clang/lib/ARCMigrate/Transforms.cpp
index ca48160d9c85..a08b0d084bb6 100644
--- a/clang/lib/ARCMigrate/Transforms.cpp
+++ b/clang/lib/ARCMigrate/Transforms.cpp
@@ -417,7 +417,7 @@ bool MigrationContext::rewritePropertyAttribute(StringRef fromAttr,
   if (tok.is(tok::r_paren))
     return false;
 
-  while (1) {
+  while (true) {
     if (tok.isNot(tok::raw_identifier)) return false;
     if (tok.getRawIdentifier() == fromAttr) {
       if (!toAttr.empty()) {
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 2530beb89d17..45e94847caee 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1281,7 +1281,7 @@ StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
     StringOffset = *StartTokenByteOffset;
     ByteNo -= StringOffset;
   }
-  while (1) {
+  while (true) {
     assert(TokNo < getNumConcatenated() && "Invalid byte number!");
     SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
 
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 9412aba42dfb..51e8a55f2e4b 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -6037,7 +6037,7 @@ static bool EvaluateArgs(ArrayRef<const Expr *> Args, CallRef Call,
           unsigned ASTIdx = Idx.getASTIndex();
           if (ASTIdx >= Args.size())
             continue;
-          ForbiddenNullArgs[ASTIdx] = 1;
+          ForbiddenNullArgs[ASTIdx] = true;
         }
     }
   }
diff --git a/clang/lib/AST/PrintfFormatString.cpp b/clang/lib/AST/PrintfFormatString.cpp
index e2569c9e20df..a286db3b9b9f 100644
--- a/clang/lib/AST/PrintfFormatString.cpp
+++ b/clang/lib/AST/PrintfFormatString.cpp
@@ -711,8 +711,8 @@ bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
     CS.setKind(ConversionSpecifier::sArg);
 
     // Disable irrelevant flags
-    HasAlternativeForm = 0;
-    HasLeadingZeroes = 0;
+    HasAlternativeForm = false;
+    HasLeadingZeroes = false;
 
     // Set the long length modifier for wide characters
     if (QT->getPointeeType()->isWideCharType())
@@ -878,9 +878,9 @@ bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
     CS.setKind(ConversionSpecifier::cArg);
     LM.setKind(LengthModifier::None);
     Precision.setHowSpecified(OptionalAmount::NotSpecified);
-    HasAlternativeForm = 0;
-    HasLeadingZeroes = 0;
-    HasPlusPrefix = 0;
+    HasAlternativeForm = false;
+    HasLeadingZeroes = false;
+    HasPlusPrefix = false;
   }
   // Test for Floating type first as LongDouble can pass isUnsignedIntegerType
   else if (QT->isRealFloatingType()) {
@@ -888,12 +888,12 @@ bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
   }
   else if (QT->isSignedIntegerType()) {
     CS.setKind(ConversionSpecifier::dArg);
-    HasAlternativeForm = 0;
+    HasAlternativeForm = false;
   }
   else if (QT->isUnsignedIntegerType()) {
     CS.setKind(ConversionSpecifier::uArg);
-    HasAlternativeForm = 0;
-    HasPlusPrefix = 0;
+    HasAlternativeForm = false;
+    HasPlusPrefix = false;
   } else {
     llvm_unreachable("Unexpected type");
   }
diff --git a/clang/lib/AST/VTableBuilder.cpp b/clang/lib/AST/VTableBuilder.cpp
index f938565c3cb4..24586d6b70d4 100644
--- a/clang/lib/AST/VTableBuilder.cpp
+++ b/clang/lib/AST/VTableBuilder.cpp
@@ -2328,7 +2328,7 @@ ItaniumVTableContext::computeVTableRelatedInformation(const CXXRecordDecl *RD) {
     return;
 
   ItaniumVTableBuilder Builder(*this, RD, CharUnits::Zero(),
-                               /*MostDerivedClassIsVirtual=*/0, RD);
+                               /*MostDerivedClassIsVirtual=*/false, RD);
   Entry = CreateVTableLayout(Builder);
 
   MethodVTableIndices.insert(Builder.vtable_indices_begin(),
diff --git a/clang/lib/Basic/Targets/AArch64.cpp b/clang/lib/Basic/Targets/AArch64.cpp
index 334ff584c9e3..cbaeabd20692 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -551,36 +551,36 @@ bool AArch64TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       FPU |= NeonMode;
     if (Feature == "+sve") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
+      HasFullFP16 = true;
     }
     if (Feature == "+sve2") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
-      HasSVE2 = 1;
+      HasFullFP16 = true;
+      HasSVE2 = true;
     }
     if (Feature == "+sve2-aes") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
-      HasSVE2 = 1;
-      HasSVE2AES = 1;
+      HasFullFP16 = true;
+      HasSVE2 = true;
+      HasSVE2AES = true;
     }
     if (Feature == "+sve2-sha3") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
-      HasSVE2 = 1;
-      HasSVE2SHA3 = 1;
+      HasFullFP16 = true;
+      HasSVE2 = true;
+      HasSVE2SHA3 = true;
     }
     if (Feature == "+sve2-sm4") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
-      HasSVE2 = 1;
-      HasSVE2SM4 = 1;
+      HasFullFP16 = true;
+      HasSVE2 = true;
+      HasSVE2SM4 = true;
     }
     if (Feature == "+sve2-bitperm") {
       FPU |= SveMode;
-      HasFullFP16 = 1;
-      HasSVE2 = 1;
-      HasSVE2BitPerm = 1;
+      HasFullFP16 = true;
+      HasSVE2 = true;
+      HasSVE2BitPerm = true;
     }
     if (Feature == "+f32mm") {
       FPU |= SveMode;
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index b976dcb3058e..313a927c26d3 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3690,7 +3690,7 @@ void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
   const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
   if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
     // Seek non-virtual primary base root.
-    while (1) {
+    while (true) {
       const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
       const CXXRecordDecl *PBT = BRL.getPrimaryBase();
       if (PBT && !BRL.isPrimaryBaseVirtual())
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index b5bcf157036d..8cc609186f9e 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -847,7 +847,7 @@ static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
 static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) {
   // FIXME: Allow unaligned atomic load/store on x86.  (It is not
   // currently supported by the backend.)
-  return 0;
+  return false;
 }
 
 /// Return the maximum size that permits atomic accesses for the given
diff --git a/clang/lib/CodeGen/CGVTables.cpp b/clang/lib/CodeGen/CGVTables.cpp
index 482499da1b0f..c839376880c4 100644
--- a/clang/lib/CodeGen/CGVTables.cpp
+++ b/clang/lib/CodeGen/CGVTables.cpp
@@ -1178,7 +1178,7 @@ bool CodeGenModule::HasLTOVisibilityPublicStd(const CXXRecordDecl *RD) {
     return false;
 
   const DeclContext *DC = RD;
-  while (1) {
+  while (true) {
     auto *D = cast<Decl>(DC);
     DC = DC->getParent();
     if (isa<TranslationUnitDecl>(DC->getRedeclContext())) {
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 4814962a472d..2d3b214ca424 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -740,7 +740,7 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
 
 #include "clang/Basic/Sanitizers.def"
 #undef SANITIZER
-  } while (0);
+  } while (false);
 
   if (D) {
     bool NoSanitizeCoverage = false;
@@ -2694,7 +2694,7 @@ void CodeGenFunction::emitAlignmentAssumptionCheck(
     SanitizerScope SanScope(this);
 
     if (!OffsetValue)
-      OffsetValue = Builder.getInt1(0); // no offset.
+      OffsetValue = Builder.getInt1(false); // no offset.
 
     llvm::Constant *StaticData[] = {EmitCheckSourceLocation(Loc),
                                     EmitCheckSourceLocation(SecondaryLoc),
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index bf74f4d3f698..79e7197d0e0a 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -610,7 +610,7 @@ void CodeGenModule::Release() {
 
   if (Context.getLangOpts().SemanticInterposition)
     // Require various optimization to respect semantic interposition.
-    getModule().setSemanticInterposition(1);
+    getModule().setSemanticInterposition(true);
 
   if (CodeGenOpts.EmitCodeView) {
     // Indicate that we want CodeView in the metadata.
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index d0ba4e44bffa..bc18b717215b 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -1606,7 +1606,7 @@ static bool isSIMDVectorType(ASTContext &Context, QualType Ty) {
 static bool isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty) {
   const RecordType *RT = Ty->getAs<RecordType>();
   if (!RT)
-    return 0;
+    return false;
   const RecordDecl *RD = RT->getDecl();
 
   // If this is a C++ record, check the bases first.
diff --git a/clang/lib/Edit/RewriteObjCFoundationAPI.cpp b/clang/lib/Edit/RewriteObjCFoundationAPI.cpp
index a3d388a5ae44..589bf8d216ed 100644
--- a/clang/lib/Edit/RewriteObjCFoundationAPI.cpp
+++ b/clang/lib/Edit/RewriteObjCFoundationAPI.cpp
@@ -704,7 +704,7 @@ static bool getLiteralInfo(SourceRange literalRange,
     }
   };
 
-  while (1) {
+  while (true) {
     if (Suff::has("u", text)) {
       UpperU = false;
     } else if (Suff::has("U", text)) {
diff --git a/clang/lib/Format/DefinitionBlockSeparator.cpp b/clang/lib/Format/DefinitionBlockSeparator.cpp
index 7748ad4a3bfe..7f6a7fa1b5df 100644
--- a/clang/lib/Format/DefinitionBlockSeparator.cpp
+++ b/clang/lib/Format/DefinitionBlockSeparator.cpp
@@ -86,11 +86,11 @@ void DefinitionBlockSeparator::separateBlocks(
       return false;
     };
 
-    bool IsDefBlock = 0;
+    bool IsDefBlock = false;
 
     if (HasEnumOnLine()) {
       // We have no scope opening/closing information for enum.
-      IsDefBlock = 1;
+      IsDefBlock = true;
       OpeningLineIndex = I;
       TargetLine = CurrentLine;
       TargetToken = CurrentLine->First;
@@ -112,7 +112,7 @@ void DefinitionBlockSeparator::separateBlocks(
       AnnotatedLine *OpeningLine = Lines[OpeningLineIndex];
       // Closing a function definition.
       if (LikelyDefinition(OpeningLine)) {
-        IsDefBlock = 1;
+        IsDefBlock = true;
         if (OpeningLineIndex > 0) {
           OpeningLineIndex -=
               Style.Language == FormatStyle::LK_CSharp &&
diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index c1c87c776f71..c293c236193c 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -2251,7 +2251,7 @@ void UnwrappedLineParser::parseTryCatch() {
     parseStructuralElement();
     --Line->Level;
   }
-  while (1) {
+  while (true) {
     if (FormatTok->is(tok::at))
       nextToken();
     if (!(FormatTok->isOneOf(tok::kw_catch, Keywords.kw___except,
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 31e7ea3d243d..4ef509493132 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1414,7 +1414,7 @@ static bool compileModuleAndReadASTBehindLock(
   StringRef Dir = llvm::sys::path::parent_path(ModuleFileName);
   llvm::sys::fs::create_directories(Dir);
 
-  while (1) {
+  while (true) {
     llvm::LockFileManager Locked(ModuleFileName);
     switch (Locked) {
     case llvm::LockFileManager::LFS_Error:
diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index 45df86ef91cd..1d0022bda474 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -792,7 +792,7 @@ static void PrintPreprocessedTokens(Preprocessor &PP, Token &Tok,
 
   bool IsStartOfLine = false;
   char Buffer[256];
-  while (1) {
+  while (true) {
     // Two lines joined with line continuation ('\' as last character on the
     // line) must be emitted as one line even though Tok.getLine() returns two
     // different values. In this situation Tok.isAtStartOfLine() is false even
diff --git a/clang/lib/Frontend/TextDiagnostic.cpp b/clang/lib/Frontend/TextDiagnostic.cpp
index 8df7496c6ddd..1c4a76e68953 100644
--- a/clang/lib/Frontend/TextDiagnostic.cpp
+++ b/clang/lib/Frontend/TextDiagnostic.cpp
@@ -44,7 +44,7 @@ static const enum raw_ostream::Colors savedColor =
 /// Add highlights to differences in template strings.
 static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str,
                                       bool &Normal, bool Bold) {
-  while (1) {
+  while (true) {
     size_t Pos = Str.find(ToggleHighlight);
     OS << Str.slice(0, Pos);
     if (Pos == StringRef::npos)
diff --git a/clang/lib/Parse/ParseCXXInlineMethods.cpp b/clang/lib/Parse/ParseCXXInlineMethods.cpp
index 19cddc69ebfc..360e8e0e7f50 100644
--- a/clang/lib/Parse/ParseCXXInlineMethods.cpp
+++ b/clang/lib/Parse/ParseCXXInlineMethods.cpp
@@ -803,7 +803,7 @@ bool Parser::ConsumeAndStoreUntil(tok::TokenKind T1, tok::TokenKind T2,
   // We always want this function to consume at least one token if the first
   // token isn't T and if not at EOF.
   bool isFirstTokenConsumed = true;
-  while (1) {
+  while (true) {
     // If we found one of the tokens, stop and return true.
     if (Tok.is(T1) || Tok.is(T2)) {
       if (ConsumeFinalToken) {
@@ -1159,7 +1159,7 @@ bool Parser::ConsumeAndStoreInitializer(CachedTokens &Toks,
   unsigned AngleCount = 0;
   unsigned KnownTemplateCount = 0;
 
-  while (1) {
+  while (true) {
     switch (Tok.getKind()) {
     case tok::comma:
       // If we might be in a template, perform a tentative parse to check.
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index dd2da7720828..76e90810f92f 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -3080,7 +3080,7 @@ void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
   ParsedAttributesWithRange attrs(AttrFactory);
   // We use Sema's policy to get bool macros right.
   PrintingPolicy Policy = Actions.getPrintingPolicy();
-  while (1) {
+  while (true) {
     bool isInvalid = false;
     bool isStorageClass = false;
     const char *PrevSpec = nullptr;
@@ -4271,7 +4271,7 @@ void Parser::ParseStructDeclaration(
   // Read struct-declarators until we find the semicolon.
   bool FirstDeclarator = true;
   SourceLocation CommaLoc;
-  while (1) {
+  while (true) {
     ParsingFieldDeclarator DeclaratorInfo(*this, DS);
     DeclaratorInfo.D.setCommaLoc(CommaLoc);
 
@@ -5580,7 +5580,7 @@ void Parser::ParseTypeQualifierListOpt(
 
   SourceLocation EndLoc;
 
-  while (1) {
+  while (true) {
     bool isInvalid = false;
     const char *PrevSpec = nullptr;
     unsigned DiagID = 0;
@@ -6272,7 +6272,7 @@ void Parser::ParseDirectDeclarator(Declarator &D) {
   if (D.hasName() && !D.getNumTypeObjects())
     MaybeParseCXX11Attributes(D);
 
-  while (1) {
+  while (true) {
     if (Tok.is(tok::l_paren)) {
       bool IsFunctionDeclaration = D.isFunctionDeclaratorAFunctionDeclaration();
       // Enter function-declaration scope, limiting any declarators to the
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 7c9d1965d117..10d527ecc635 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -2905,7 +2905,7 @@ Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
   //   member-declarator
   //   member-declarator-list ',' member-declarator
 
-  while (1) {
+  while (true) {
     InClassInitStyle HasInClassInit = ICIS_NoInit;
     bool HasStaticInitializer = false;
     if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index b8649f9f0c21..2bb9ff4e718c 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -400,7 +400,7 @@ Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
   SourceLocation ColonLoc;
 
   auto SavedType = PreferredType;
-  while (1) {
+  while (true) {
     // Every iteration may rely on a preferred type for the whole expression.
     PreferredType = SavedType;
     // If this token has a lower precedence than we are allowed to parse (e.g.
@@ -1853,7 +1853,7 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
   // parsed, see if there are any postfix-expression pieces here.
   SourceLocation Loc;
   auto SavedType = PreferredType;
-  while (1) {
+  while (true) {
     // Each iteration relies on preferred type for the whole expression.
     PreferredType = SavedType;
     switch (Tok.getKind()) {
@@ -2558,7 +2558,7 @@ ExprResult Parser::ParseBuiltinPrimaryExpression() {
     Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
 
     // FIXME: This loop leaks the index expressions on error.
-    while (1) {
+    while (true) {
       if (Tok.is(tok::period)) {
         // offsetof-member-designator: offsetof-member-designator '.' identifier
         Comps.push_back(Sema::OffsetOfComponent());
@@ -3358,7 +3358,7 @@ bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
                                  SmallVectorImpl<SourceLocation> &CommaLocs,
                                  llvm::function_ref<void()> ExpressionStarts) {
   bool SawError = false;
-  while (1) {
+  while (true) {
     if (ExpressionStarts)
       ExpressionStarts();
 
@@ -3418,7 +3418,7 @@ bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
 bool
 Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
                                   SmallVectorImpl<SourceLocation> &CommaLocs) {
-  while (1) {
+  while (true) {
     ExprResult Expr = ParseAssignmentExpression();
     if (Expr.isInvalid())
       return true;
diff --git a/clang/lib/Parse/ParseInit.cpp b/clang/lib/Parse/ParseInit.cpp
index e7b444ef043e..fd0faba9c1c1 100644
--- a/clang/lib/Parse/ParseInit.cpp
+++ b/clang/lib/Parse/ParseInit.cpp
@@ -472,7 +472,7 @@ ExprResult Parser::ParseBraceInitializer() {
     return PreferredType;
   };
 
-  while (1) {
+  while (true) {
     PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp);
 
     // Handle Microsoft __if_exists/if_not_exists if necessary.
diff --git a/clang/lib/Parse/ParseObjc.cpp b/clang/lib/Parse/ParseObjc.cpp
index 9e145f57d61f..f493ac9b92ca 100644
--- a/clang/lib/Parse/ParseObjc.cpp
+++ b/clang/lib/Parse/ParseObjc.cpp
@@ -134,7 +134,7 @@ Parser::ParseObjCAtClassDeclaration(SourceLocation atLoc) {
   SmallVector<SourceLocation, 8> ClassLocs;
   SmallVector<ObjCTypeParamList *, 8> ClassTypeParams;
 
-  while (1) {
+  while (true) {
     MaybeSkipAttributes(tok::objc_class);
     if (expectIdentifier()) {
       SkipUntil(tok::semi);
@@ -598,7 +598,7 @@ void Parser::ParseObjCInterfaceDeclList(tok::ObjCKeywordKind contextKey,
 
   SourceRange AtEnd;
 
-  while (1) {
+  while (true) {
     // If this is a method prototype, parse it.
     if (Tok.isOneOf(tok::minus, tok::plus)) {
       if (Decl *methodPrototype =
@@ -848,7 +848,7 @@ void Parser::ParseObjCPropertyAttribute(ObjCDeclSpec &DS) {
   BalancedDelimiterTracker T(*this, tok::l_paren);
   T.consumeOpen();
 
-  while (1) {
+  while (true) {
     if (Tok.is(tok::code_completion)) {
       cutOffParsing();
       Actions.CodeCompleteObjCPropertyFlags(getCurScope(), DS);
@@ -1149,7 +1149,7 @@ void Parser::ParseObjCTypeQualifierList(ObjCDeclSpec &DS,
   assert(Context == DeclaratorContext::ObjCParameter ||
          Context == DeclaratorContext::ObjCResult);
 
-  while (1) {
+  while (true) {
     if (Tok.is(tok::code_completion)) {
       cutOffParsing();
       Actions.CodeCompleteObjCPassingType(
@@ -1401,7 +1401,7 @@ Decl *Parser::ParseObjCMethodDecl(SourceLocation mLoc,
                             Scope::FunctionDeclarationScope | Scope::DeclScope);
 
   AttributePool allParamAttrs(AttrFactory);
-  while (1) {
+  while (true) {
     ParsedAttributes paramAttrs(AttrFactory);
     Sema::ObjCArgInfo ArgInfo;
 
@@ -1531,7 +1531,7 @@ ParseObjCProtocolReferences(SmallVectorImpl<Decl *> &Protocols,
 
   SmallVector<IdentifierLocPair, 8> ProtocolIdents;
 
-  while (1) {
+  while (true) {
     if (Tok.is(tok::code_completion)) {
       cutOffParsing();
       Actions.CodeCompleteObjCProtocolReferences(ProtocolIdents);
@@ -2050,7 +2050,7 @@ Parser::ParseObjCAtProtocolDeclaration(SourceLocation AtLoc,
     ProtocolRefs.push_back(std::make_pair(protocolName, nameLoc));
 
     // Parse the list of forward declarations.
-    while (1) {
+    while (true) {
       ConsumeToken(); // the ','
       if (expectIdentifier()) {
         SkipUntil(tok::semi);
@@ -3179,7 +3179,7 @@ Parser::ParseObjCMessageExpressionBody(SourceLocation LBracLoc,
   ExprVector KeyExprs;
 
   if (Tok.is(tok::colon)) {
-    while (1) {
+    while (true) {
       // Each iteration parses a single keyword argument.
       KeyIdents.push_back(selIdent);
       KeyLocs.push_back(Loc);
@@ -3599,7 +3599,7 @@ ExprResult Parser::ParseObjCSelectorExpression(SourceLocation AtLoc) {
 
   unsigned nColons = 0;
   if (Tok.isNot(tok::r_paren)) {
-    while (1) {
+    while (true) {
       if (TryConsumeToken(tok::coloncolon)) { // Handle :: in C++.
         ++nColons;
         KeyIdents.push_back(nullptr);
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 292ab03e8614..cc0a9d1a5b88 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -1068,7 +1068,7 @@ StmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) {
     SourceLocation LabelLoc = ConsumeToken();
 
     SmallVector<Decl *, 8> DeclsInGroup;
-    while (1) {
+    while (true) {
       if (Tok.isNot(tok::identifier)) {
         Diag(Tok, diag::err_expected) << tok::identifier;
         break;
diff --git a/clang/lib/Parse/ParseStmtAsm.cpp b/clang/lib/Parse/ParseStmtAsm.cpp
index 3e9ce8fd668f..e1aa623ffbe4 100644
--- a/clang/lib/Parse/ParseStmtAsm.cpp
+++ b/clang/lib/Parse/ParseStmtAsm.cpp
@@ -508,7 +508,7 @@ StmtResult Parser::ParseMicrosoftAsmStatement(SourceLocation AsmLoc) {
     TokLoc = Tok.getLocation();
     ++NumTokensRead;
     SkippedStartOfLine = false;
-  } while (1);
+  } while (true);
 
   if (BraceNesting && BraceCount != savedBraceCount) {
     // __asm without closing brace (this can happen at EOF).
@@ -681,7 +681,7 @@ StmtResult Parser::ParseMicrosoftAsmStatement(SourceLocation AsmLoc) {
 ///         asm-qualifier
 ///         asm-qualifier-list asm-qualifier
 bool Parser::parseGNUAsmQualifierListOpt(GNUAsmQualifiers &AQ) {
-  while (1) {
+  while (true) {
     const GNUAsmQualifiers::AQ A = getGNUAsmQualifier(Tok);
     if (A == GNUAsmQualifiers::AQ_unspecified) {
       if (Tok.isNot(tok::l_paren)) {
@@ -810,7 +810,7 @@ StmtResult Parser::ParseAsmStatement(bool &msAsm) {
     }
     // Parse the asm-string list for clobbers if present.
     if (!AteExtraColon && isTokenStringLiteral()) {
-      while (1) {
+      while (true) {
         ExprResult Clobber(ParseAsmStringLiteral(/*ForAsmLabel*/ false));
 
         if (Clobber.isInvalid())
@@ -888,7 +888,7 @@ bool Parser::ParseAsmOperandsOpt(SmallVectorImpl<IdentifierInfo *> &Names,
   if (!isTokenStringLiteral() && Tok.isNot(tok::l_square))
     return false;
 
-  while (1) {
+  while (true) {
     // Read the [id] if present.
     if (Tok.is(tok::l_square)) {
       BalancedDelimiterTracker T(*this, tok::l_square);
diff --git a/clang/lib/Parse/ParseTemplate.cpp b/clang/lib/Parse/ParseTemplate.cpp
index 204b53441ab4..dd61d1ef6c9f 100644
--- a/clang/lib/Parse/ParseTemplate.cpp
+++ b/clang/lib/Parse/ParseTemplate.cpp
@@ -500,7 +500,7 @@ bool Parser::ParseTemplateParameters(
 bool
 Parser::ParseTemplateParameterList(const unsigned Depth,
                              SmallVectorImpl<NamedDecl*> &TemplateParams) {
-  while (1) {
+  while (true) {
 
     if (NamedDecl *TmpParam
           = ParseTemplateParameter(Depth, TemplateParams.size())) {
diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index 35c9036fb27e..512993a5278e 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -277,7 +277,7 @@ Parser::TPResult Parser::TryParseSimpleDeclaration(bool AllowForRangeDecl) {
 ///         '{' '}'
 ///
 Parser::TPResult Parser::TryParseInitDeclaratorList() {
-  while (1) {
+  while (true) {
     // declarator
     TPResult TPR = TryParseDeclarator(false/*mayBeAbstract*/);
     if (TPR != TPResult::Ambiguous)
@@ -1068,7 +1068,7 @@ Parser::TPResult Parser::TryParseDeclarator(bool mayBeAbstract,
   if (mayHaveDirectInit)
     return TPResult::Ambiguous;
 
-  while (1) {
+  while (true) {
     TPResult TPR(TPResult::Ambiguous);
 
     if (Tok.is(tok::l_paren)) {
@@ -1898,7 +1898,7 @@ Parser::TryParseParameterDeclarationClause(bool *InvalidAsDeclaration,
   //   parameter-declaration
   //   parameter-declaration-list ',' parameter-declaration
   //
-  while (1) {
+  while (true) {
     // '...'[opt]
     if (Tok.is(tok::ellipsis)) {
       ConsumeToken();
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index 11113fa1a060..d0b920bf5f99 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -279,7 +279,7 @@ bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
   // We always want this function to skip at least one token if the first token
   // isn't T and if not at EOF.
   bool isFirstTokenSkipped = true;
-  while (1) {
+  while (true) {
     // If we found one of the tokens, stop and return true.
     for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
       if (Tok.is(Toks[i])) {
@@ -1448,7 +1448,7 @@ void Parser::ParseKNRParamDeclarations(Declarator &D) {
     ParseDeclarator(ParmDeclarator);
 
     // Handle the full declarator list.
-    while (1) {
+    while (true) {
       // If attributes are present, parse them.
       MaybeParseGNUAttributes(ParmDeclarator);
 
diff --git a/clang/lib/Rewrite/HTMLRewrite.cpp b/clang/lib/Rewrite/HTMLRewrite.cpp
index e9b678b69594..70ea2fcd3d04 100644
--- a/clang/lib/Rewrite/HTMLRewrite.cpp
+++ b/clang/lib/Rewrite/HTMLRewrite.cpp
@@ -542,7 +542,7 @@ void html::HighlightMacros(Rewriter &R, FileID FID, const Preprocessor& PP) {
 
   // Lex all the tokens in raw mode, to avoid entering #includes or expanding
   // macros.
-  while (1) {
+  while (true) {
     Token Tok;
     L.LexFromRawLexer(Tok);
 
diff --git a/clang/lib/Sema/Scope.cpp b/clang/lib/Sema/Scope.cpp
index 51b0b24e57b7..499279a2659d 100644
--- a/clang/lib/Sema/Scope.cpp
+++ b/clang/lib/Sema/Scope.cpp
@@ -91,7 +91,7 @@ void Scope::Init(Scope *parent, unsigned flags) {
   UsingDirectives.clear();
   Entity = nullptr;
   ErrorTrap.reset();
-  NRVO.setPointerAndInt(nullptr, 0);
+  NRVO.setPointerAndInt(nullptr, false);
 }
 
 bool Scope::containedInPrototypeScope() const {
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index e089f85420bc..c075cbf536ca 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -1438,7 +1438,7 @@ bool ResultBuilder::IsOrdinaryNonTypeName(const NamedDecl *ND) const {
 
 bool ResultBuilder::IsIntegralConstantValue(const NamedDecl *ND) const {
   if (!IsOrdinaryNonTypeName(ND))
-    return 0;
+    return false;
 
   if (const auto *VD = dyn_cast<ValueDecl>(ND->getUnderlyingDecl()))
     if (VD->getType()->isIntegralOrEnumerationType())
diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index 466e37831f66..678f1e40e730 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -1058,7 +1058,7 @@ concepts::ExprRequirement::ExprRequirement(
 
 concepts::ExprRequirement::ReturnTypeRequirement::
 ReturnTypeRequirement(TemplateParameterList *TPL) :
-    TypeConstraintInfo(TPL, 0) {
+    TypeConstraintInfo(TPL, false) {
   assert(TPL->size() == 1);
   const TypeConstraint *TC =
       cast<TemplateTypeParmDecl>(TPL->getParam(0))->getTypeConstraint();
@@ -1070,7 +1070,7 @@ ReturnTypeRequirement(TemplateParameterList *TPL) :
       Constraint->getTemplateArgsAsWritten() &&
       TemplateSpecializationType::anyInstantiationDependentTemplateArguments(
           Constraint->getTemplateArgsAsWritten()->arguments().drop_front(1));
-  TypeConstraintInfo.setInt(Dependent ? 1 : 0);
+  TypeConstraintInfo.setInt(Dependent ? true : false);
 }
 
 concepts::TypeRequirement::TypeRequirement(TypeSourceInfo *T) :
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 732f07c1e0b3..724ea53463ca 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -4761,11 +4761,11 @@ ASTReader::ASTReadResult ASTReader::readUnhashedControlBlockImpl(
         break;
       unsigned Count = Record[0];
       const char *Byte = Blob.data();
-      F->SearchPathUsage = llvm::BitVector(Count, 0);
+      F->SearchPathUsage = llvm::BitVector(Count, false);
       for (unsigned I = 0; I < Count; ++Byte)
         for (unsigned Bit = 0; Bit < 8 && I < Count; ++Bit, ++I)
           if (*Byte & (1 << Bit))
-            F->SearchPathUsage[I] = 1;
+            F->SearchPathUsage[I] = true;
       break;
     }
   }
diff --git a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
index 7cdd78b8adfb..7841fd82e370 100644
--- a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
@@ -302,7 +302,7 @@ class ExplodedGraphViewer : public Checker< check::EndAnalysis > {
 public:
   ExplodedGraphViewer() {}
   void checkEndAnalysis(ExplodedGraph &G, BugReporter &B,ExprEngine &Eng) const {
-    Eng.ViewGraph(0);
+    Eng.ViewGraph(false);
   }
 };
 
diff --git a/clang/lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp b/clang/lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp
index dad8a7b3caae..0bd47ced15a5 100644
--- a/clang/lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp
+++ b/clang/lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp
@@ -432,7 +432,7 @@ SVal SimpleSValBuilder::evalBinOpNN(ProgramStateRef state,
         return evalCast(lhs, resultTy, QualType{});
     }
 
-  while (1) {
+  while (true) {
     switch (lhs.getSubKind()) {
     default:
       return makeSymExprValNN(op, lhs, rhs, resultTy);