Use StringRef::{starts,ends}_with (NFC)

This patch replaces uses of StringRef::{starts,ends}with with
StringRef::{starts,ends}_with for consistency with
std::{string,string_view}::{starts,ends}_with in C++20.

I'm planning to deprecate and eventually remove
StringRef::{starts,ends}with.

clang-tools-extra/clang-change-namespace/ChangeNamespace.cpp

@@ -827,10 +827,10 @@ void ChangeNamespaceTool::replaceQualifiedSymbolInDeclContext(
       // "IsVisibleInNewNs" matcher.
       if (AliasQualifiedName != AliasName) {
         // The alias is defined in some namespace.
-        assert(StringRef(AliasQualifiedName).endswith("::" + AliasName));
+        assert(StringRef(AliasQualifiedName).ends_with("::" + AliasName));
         llvm::StringRef AliasNs =
             StringRef(AliasQualifiedName).drop_back(AliasName.size() + 2);
-        if (!llvm::StringRef(OldNs).startswith(AliasNs))
+        if (!llvm::StringRef(OldNs).starts_with(AliasNs))
           continue;
       }
       std::string NameWithAliasNamespace =
@@ -862,7 +862,7 @@ void ChangeNamespaceTool::replaceQualifiedSymbolInDeclContext(
   // If the new nested name in the new namespace is the same as it was in the
   // old namespace, we don't create replacement unless there can be ambiguity.
   if ((NestedName == ReplaceName && !Conflict) ||
-      (NestedName.startswith("::") && NestedName.drop_front(2) == ReplaceName))
+      (NestedName.starts_with("::") && NestedName.drop_front(2) == ReplaceName))
     return;
   // If the reference need to be fully-qualified, add a leading "::" unless
   // NewNamespace is the global namespace.
@@ -891,7 +891,7 @@ void ChangeNamespaceTool::fixTypeLoc(
   // a typedef type, we need to use the typedef type instead.
   auto IsInMovedNs = [&](const NamedDecl *D) {
     if (!llvm::StringRef(D->getQualifiedNameAsString())
-             .startswith(OldNamespace + "::"))
+             .starts_with(OldNamespace + "::"))
       return false;
     auto ExpansionLoc = Result.SourceManager->getExpansionLoc(D->getBeginLoc());
     if (ExpansionLoc.isInvalid())

clang-tools-extra/clang-include-fixer/IncludeFixerContext.cpp

@@ -28,7 +28,7 @@ std::string createQualifiedNameForReplacement(
     const find_all_symbols::SymbolInfo &MatchedSymbol) {
   // No need to add missing qualifiers if SymbolIdentifier has a global scope
   // operator "::".
-  if (RawSymbolName.startswith("::"))
+  if (RawSymbolName.starts_with("::"))
     return std::string(RawSymbolName);
 
   std::string QualifiedName = MatchedSymbol.getQualifiedName();
@@ -42,7 +42,7 @@ std::string createQualifiedNameForReplacement(
   auto SymbolQualifiers = SplitQualifiers(RawSymbolName);
   std::string StrippedQualifiers;
   while (!SymbolQualifiers.empty() &&
-         !llvm::StringRef(QualifiedName).endswith(SymbolQualifiers.back())) {
+         !llvm::StringRef(QualifiedName).ends_with(SymbolQualifiers.back())) {
     StrippedQualifiers =
         "::" + SymbolQualifiers.back().str() + StrippedQualifiers;
     SymbolQualifiers.pop_back();

clang-tools-extra/clang-include-fixer/SymbolIndexManager.cpp

@@ -82,7 +82,7 @@ SymbolIndexManager::search(llvm::StringRef Identifier,
   Identifier.split(Names, "::");
 
   bool IsFullyQualified = false;
-  if (Identifier.startswith("::")) {
+  if (Identifier.starts_with("::")) {
     Names.erase(Names.begin()); // Drop first (empty) element.
     IsFullyQualified = true;
   }

clang-tools-extra/clang-include-fixer/find-all-symbols/PathConfig.cpp

@@ -24,7 +24,7 @@ std::string getIncludePath(const SourceManager &SM, SourceLocation Loc,
     FilePath = SM.getFilename(Loc);
     if (FilePath.empty())
       return "";
-    if (!FilePath.endswith(".inc"))
+    if (!FilePath.ends_with(".inc"))
       break;
     FileID ID = SM.getFileID(Loc);
     Loc = SM.getIncludeLoc(ID);

clang-tools-extra/clang-include-fixer/plugin/IncludeFixerPlugin.cpp

@@ -54,9 +54,9 @@ public:
     // Parse the extra command line args.
     // FIXME: This is very limited at the moment.
     for (StringRef Arg : Args) {
-      if (Arg.startswith("-db="))
+      if (Arg.starts_with("-db="))
         DB = Arg.substr(strlen("-db="));
-      else if (Arg.startswith("-input="))
+      else if (Arg.starts_with("-input="))
         Input = Arg.substr(strlen("-input="));
     }
 

clang-tools-extra/include-cleaner/lib/Analysis.cpp

@@ -126,7 +126,7 @@ analyze(llvm::ArrayRef<Decl *> ASTRoots,
         // Since most private -> public mappings happen in a verbatim way, we
         // check textually here. This might go wrong in presence of symlinks or
         // header mappings. But that's not different than rest of the places.
-        if (MainFile->tryGetRealPathName().endswith(PHeader))
+        if (MainFile->tryGetRealPathName().ends_with(PHeader))
           continue;
       }
     }

clang-tools-extra/include-cleaner/lib/Record.cpp

@@ -277,7 +277,7 @@ public:
     int CommentLine = SM.getLineNumber(CommentFID, CommentOffset);
 
     if (InMainFile) {
-      if (Pragma->startswith("keep")) {
+      if (Pragma->starts_with("keep")) {
         KeepStack.push_back({CommentLine, false});
       } else if (Pragma->starts_with("begin_keep")) {
         KeepStack.push_back({CommentLine, true});
@@ -300,9 +300,10 @@ public:
       StringRef PublicHeader;
       if (Pragma->consume_front(", include ")) {
         // We always insert using the spelling from the pragma.
-        PublicHeader = save(Pragma->startswith("<") || Pragma->startswith("\"")
-                                ? (*Pragma)
-                                : ("\"" + *Pragma + "\"").str());
+        PublicHeader =
+            save(Pragma->starts_with("<") || Pragma->starts_with("\"")
+                     ? (*Pragma)
+                     : ("\"" + *Pragma + "\"").str());
       }
       Out->IWYUPublic.insert({CommentUID, PublicHeader});
       return false;
@@ -313,11 +314,11 @@ public:
     }
     auto Filename = FE->getName();
     // Record export pragma.
-    if (Pragma->startswith("export")) {
+    if (Pragma->starts_with("export")) {
       ExportStack.push_back({CommentLine, CommentFID, save(Filename), false});
-    } else if (Pragma->startswith("begin_exports")) {
+    } else if (Pragma->starts_with("begin_exports")) {
       ExportStack.push_back({CommentLine, CommentFID, save(Filename), true});
-    } else if (Pragma->startswith("end_exports")) {
+    } else if (Pragma->starts_with("end_exports")) {
       // FIXME: be robust on unmatching cases. We should only pop the stack if
       // the begin_exports and end_exports is in the same file.
       if (!ExportStack.empty()) {

clang-tools-extra/modularize/CoverageChecker.cpp

@@ -302,7 +302,7 @@ void CoverageChecker::collectUmbrellaHeaderHeader(StringRef HeaderName) {
     sys::fs::current_path(PathBuf);
   // HeaderName will have an absolute path, so if it's the module map
   // directory, we remove it, also skipping trailing separator.
-  if (HeaderName.startswith(PathBuf))
+  if (HeaderName.starts_with(PathBuf))
     HeaderName = HeaderName.substr(PathBuf.size() + 1);
   // Save header name.
   ModuleMapHeadersSet.insert(ModularizeUtilities::getCanonicalPath(HeaderName));
@@ -356,8 +356,8 @@ bool CoverageChecker::collectFileSystemHeaders(StringRef IncludePath) {
     sys::path::append(Directory, IncludePath);
   if (Directory.size() == 0)
     Directory = ".";
-  if (IncludePath.startswith("/") || IncludePath.startswith("\\") ||
-    ((IncludePath.size() >= 2) && (IncludePath[1] == ':'))) {
+  if (IncludePath.starts_with("/") || IncludePath.starts_with("\\") ||
+      ((IncludePath.size() >= 2) && (IncludePath[1] == ':'))) {
     llvm::errs() << "error: Include path \"" << IncludePath
       << "\" is not relative to the module map file.\n";
     return false;

clang-tools-extra/modularize/ModularizeUtilities.cpp

@@ -75,12 +75,11 @@ std::error_code ModularizeUtilities::loadAllHeaderListsAndDependencies() {
   for (auto I = InputFilePaths.begin(), E = InputFilePaths.end(); I != E; ++I) {
     llvm::StringRef InputPath = *I;
     // If it's a module map.
-    if (InputPath.endswith(".modulemap")) {
+    if (InputPath.ends_with(".modulemap")) {
       // Load the module map.
       if (std::error_code EC = loadModuleMap(InputPath))
         return EC;
-    }
-    else {
+    } else {
       // Else we assume it's a header list and load it.
       if (std::error_code EC = loadSingleHeaderListsAndDependencies(InputPath)) {
         errs() << "modularize: error: Unable to get header list '" << InputPath
@@ -276,7 +275,7 @@ std::error_code ModularizeUtilities::loadModuleMap(
   StringRef DirName(Dir.getName());
   if (llvm::sys::path::filename(DirName) == "Modules") {
     DirName = llvm::sys::path::parent_path(DirName);
-    if (DirName.endswith(".framework")) {
+    if (DirName.ends_with(".framework")) {
       auto FrameworkDirOrErr = FileMgr->getDirectoryRef(DirName);
       if (!FrameworkDirOrErr) {
         // This can happen if there's a race between the above check and the
@@ -444,7 +443,7 @@ static std::string replaceDotDot(StringRef Path) {
       llvm::sys::path::append(Buffer, *B);
     ++B;
   }
-  if (Path.endswith("/") || Path.endswith("\\"))
+  if (Path.ends_with("/") || Path.ends_with("\\"))
     Buffer.append(1, Path.back());
   return Buffer.c_str();
 }
@@ -457,7 +456,7 @@ std::string ModularizeUtilities::getCanonicalPath(StringRef FilePath) {
   std::string Tmp(replaceDotDot(FilePath));
   std::replace(Tmp.begin(), Tmp.end(), '\\', '/');
   StringRef Tmp2(Tmp);
-  if (Tmp2.startswith("./"))
+  if (Tmp2.starts_with("./"))
     Tmp = std::string(Tmp2.substr(2));
   return Tmp;
 }

clang-tools-extra/modularize/PreprocessorTracker.cpp

@@ -883,7 +883,7 @@ public:
   // Handle entering a header source file.
   void handleHeaderEntry(clang::Preprocessor &PP, llvm::StringRef HeaderPath) {
     // Ignore <built-in> and <command-line> to reduce message clutter.
-    if (HeaderPath.startswith("<"))
+    if (HeaderPath.starts_with("<"))
       return;
     HeaderHandle H = addHeader(HeaderPath);
     if (H != getCurrentHeaderHandle())
@@ -896,7 +896,7 @@ public:
   // Handle exiting a header source file.
   void handleHeaderExit(llvm::StringRef HeaderPath) {
     // Ignore <built-in> and <command-line> to reduce message clutter.
-    if (HeaderPath.startswith("<"))
+    if (HeaderPath.starts_with("<"))
       return;
     HeaderHandle H = findHeaderHandle(HeaderPath);
     HeaderHandle TH;

clang-tools-extra/pseudo/lib/cxx/CXX.cpp

@@ -28,9 +28,9 @@ static const char *CXXBNF =
 
 // User-defined string literals look like `""suffix`.
 bool isStringUserDefined(const Token &Tok) {
-  return !Tok.text().endswith("\"");
+  return !Tok.text().ends_with("\"");
 }
-bool isCharUserDefined(const Token &Tok) { return !Tok.text().endswith("'"); }
+bool isCharUserDefined(const Token &Tok) { return !Tok.text().ends_with("'"); }
 
 // Combinable flags describing numbers.
 // Clang has just one numeric_token kind, the grammar has 4.

clang-tools-extra/pseudo/lib/grammar/GrammarBNF.cpp

@@ -33,11 +33,11 @@ public:
 
     assert(llvm::all_of(Specs,
                         [](const RuleSpec &R) {
-                          if (R.Target.endswith(OptSuffix))
+                          if (R.Target.ends_with(OptSuffix))
                             return false;
                           return llvm::all_of(
                               R.Sequence, [](const RuleSpec::Element &E) {
-                                return !E.Symbol.endswith(OptSuffix);
+                                return !E.Symbol.ends_with(OptSuffix);
                               });
                         }) &&
            "Optional symbols should be eliminated!");
@@ -225,7 +225,7 @@ private:
       Chunk = Chunk.trim();
       if (Chunk.empty())
         continue; // skip empty
-      if (Chunk.startswith("[") && Chunk.endswith("]")) {
+      if (Chunk.starts_with("[") && Chunk.ends_with("]")) {
         if (Out.Sequence.empty())
           continue;
 
@@ -241,7 +241,7 @@ private:
   bool parseAttributes(
       llvm::StringRef Content,
       std::vector<std::pair<llvm::StringRef, llvm::StringRef>> &Out) {
-    assert(Content.startswith("[") && Content.endswith("]"));
+    assert(Content.starts_with("[") && Content.ends_with("]"));
     auto KV = Content.drop_front().drop_back().split('=');
     Out.push_back({KV.first, KV.second.trim()});
 
@@ -299,7 +299,7 @@ private:
     if (Elements.empty())
       return CB();
     auto Front = Elements.front();
-    if (!Front.Symbol.endswith(OptSuffix)) {
+    if (!Front.Symbol.ends_with(OptSuffix)) {
       Result.push_back(std::move(Front));
       eliminateOptionalTail(Elements.drop_front(1), Result, CB);
       Result.pop_back();

clang-tools-extra/unittests/clang-tidy/GoogleModuleTest.cpp

@@ -66,7 +66,7 @@ protected:
                                       "#define SOME_MACRO(x) using x\n";
     std::vector<ClangTidyError> Errors;
     std::vector<std::string> Args;
-    if (!StringRef(Filename).endswith(".cpp")) {
+    if (!StringRef(Filename).ends_with(".cpp")) {
       Args.emplace_back("-xc++-header");
     }
     test::runCheckOnCode<readability::GlobalNamesInHeadersCheck>(

lld/ELF/Arch/ARM.cpp

@@ -948,15 +948,15 @@ int64_t ARM::getImplicitAddend(const uint8_t *buf, RelType type) const {
 }
 
 static bool isArmMapSymbol(const Symbol *b) {
-  return b->getName() == "$a" || b->getName().startswith("$a.");
+  return b->getName() == "$a" || b->getName().starts_with("$a.");
 }
 
 static bool isThumbMapSymbol(const Symbol *s) {
-  return s->getName() == "$t" || s->getName().startswith("$t.");
+  return s->getName() == "$t" || s->getName().starts_with("$t.");
 }
 
 static bool isDataMapSymbol(const Symbol *b) {
-  return b->getName() == "$d" || b->getName().startswith("$d.");
+  return b->getName() == "$d" || b->getName().starts_with("$d.");
 }
 
 void elf::sortArmMappingSymbols() {
@@ -1189,7 +1189,7 @@ void elf::processArmCmseSymbols() {
   // Only symbols with external linkage end up in symtab, so no need to do
   // linkage checks. Only check symbol type.
   for (Symbol *acleSeSym : symtab.getSymbols()) {
-    if (!acleSeSym->getName().startswith(ACLESESYM_PREFIX))
+    if (!acleSeSym->getName().starts_with(ACLESESYM_PREFIX))
       continue;
     // If input object build attributes do not support CMSE, error and disable
     // further scanning for <sym>, __acle_se_<sym> pairs.