Reduce the number of implicit StringRef->std::string conversions by threading StringRef through more APIs.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260815 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/ASTMatchers/ASTMatchers.h

@@ -1844,8 +1844,9 @@ inline internal::Matcher<Stmt> sizeOfExpr(
 /// \code
 ///   namespace a { namespace b { class X; } }
 /// \endcode
-inline internal::Matcher<NamedDecl> hasName(const std::string &Name) {
-  return internal::Matcher<NamedDecl>(new internal::HasNameMatcher(Name));
+inline internal::Matcher<NamedDecl> hasName(std::string Name) {
+  return internal::Matcher<NamedDecl>(
+      new internal::HasNameMatcher(std::move(Name)));
 }
 
 /// \brief Matches NamedDecl nodes whose fully qualified names contain

include/clang/ASTMatchers/ASTMatchersInternal.h

@@ -640,7 +640,7 @@ private:
 /// See \c hasName() in ASTMatchers.h for details.
 class HasNameMatcher : public SingleNodeMatcherInterface<NamedDecl> {
  public:
-  explicit HasNameMatcher(StringRef Name);
+  explicit HasNameMatcher(std::string Name);
 
   bool matchesNode(const NamedDecl &Node) const override;
 

include/clang/Serialization/ASTReader.h

@@ -1364,7 +1364,7 @@ public:
   /// \param ClientLoadCapabilities The set of client load-failure
   /// capabilities, represented as a bitset of the enumerators of
   /// LoadFailureCapabilities.
-  ASTReadResult ReadAST(const std::string &FileName, ModuleKind Type,
+  ASTReadResult ReadAST(StringRef FileName, ModuleKind Type,
                         SourceLocation ImportLoc,
                         unsigned ClientLoadCapabilities);
 

include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h

@@ -774,8 +774,8 @@ public:
 
   void appendToDesc(StringRef S) {
     if (!ShortDesc.empty())
-      ShortDesc.append(S);
-    VerboseDesc.append(S);
+      ShortDesc += S;
+    VerboseDesc += S;
   }
 
   void resetPath() {

lib/ASTMatchers/ASTMatchersInternal.cpp

@@ -293,8 +293,9 @@ bool AnyOfVariadicOperator(const ast_type_traits::DynTypedNode &DynNode,
   return false;
 }
 
-HasNameMatcher::HasNameMatcher(StringRef NameRef)
-    : UseUnqualifiedMatch(NameRef.find("::") == NameRef.npos), Name(NameRef) {
+HasNameMatcher::HasNameMatcher(std::string NameRef)
+    : UseUnqualifiedMatch(NameRef.find("::") == NameRef.npos),
+      Name(std::move(NameRef)) {
   assert(!Name.empty());
 }
 

lib/CodeGen/CGObjCGNU.cpp

@@ -591,7 +591,7 @@ public:
     return NULLPtr;
   }
 
-  llvm::GlobalVariable *GetClassGlobal(const std::string &Name,
+  llvm::GlobalVariable *GetClassGlobal(StringRef Name,
                                        bool Weak = false) override {
     return nullptr;
   }

lib/CodeGen/CGObjCMac.cpp

@@ -1256,7 +1256,7 @@ public:
 
   /// GetClassGlobal - Return the global variable for the Objective-C
   /// class of the given name.
-  llvm::GlobalVariable *GetClassGlobal(const std::string &Name,
+  llvm::GlobalVariable *GetClassGlobal(StringRef Name,
                                        bool Weak = false) override {
     llvm_unreachable("CGObjCMac::GetClassGlobal");
   }
@@ -1358,7 +1358,7 @@ private:
   
   /// GetClassGlobal - Return the global variable for the Objective-C
   /// class of the given name.
-  llvm::GlobalVariable *GetClassGlobal(const std::string &Name,
+  llvm::GlobalVariable *GetClassGlobal(StringRef Name,
                                        bool Weak = false) override;
 
   /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
@@ -6834,7 +6834,7 @@ CGObjCNonFragileABIMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
 }
 
 llvm::GlobalVariable *
-CGObjCNonFragileABIMac::GetClassGlobal(const std::string &Name, bool Weak) {
+CGObjCNonFragileABIMac::GetClassGlobal(StringRef Name, bool Weak) {
   llvm::GlobalValue::LinkageTypes L =
       Weak ? llvm::GlobalValue::ExternalWeakLinkage
            : llvm::GlobalValue::ExternalLinkage;

lib/CodeGen/CGObjCRuntime.h

@@ -280,7 +280,7 @@ public:
   virtual llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM,
                                            QualType T) = 0;
 
-  virtual llvm::GlobalVariable *GetClassGlobal(const std::string &Name,
+  virtual llvm::GlobalVariable *GetClassGlobal(StringRef Name,
                                                bool Weak = false) = 0;
 
   struct MessageSendInfo {

lib/Frontend/CacheTokens.cpp

@@ -241,7 +241,7 @@ public:
       : Out(out), PP(pp), idcount(0), CurStrOffset(0) {}
 
   PTHMap &getPM() { return PM; }
-  void GeneratePTH(const std::string &MainFile);
+  void GeneratePTH(StringRef MainFile);
 };
 } // end anonymous namespace
 
@@ -479,7 +479,7 @@ static void pwrite32le(raw_pwrite_stream &OS, uint32_t Val, uint64_t &Off) {
   Off += 4;
 }
 
-void PTHWriter::GeneratePTH(const std::string &MainFile) {
+void PTHWriter::GeneratePTH(StringRef MainFile) {
   // Generate the prologue.
   Out << "cfe-pth" << '\0';
   Emit32(PTHManager::Version);

lib/Frontend/CompilerInstance.cpp

@@ -467,7 +467,7 @@ IntrusiveRefCntPtr<ASTReader> CompilerInstance::createPCHExternalASTSource(
 // Code Completion
 
 static bool EnableCodeCompletion(Preprocessor &PP,
-                                 const std::string &Filename,
+                                 StringRef Filename,
                                  unsigned Line,
                                  unsigned Column) {
   // Tell the source manager to chop off the given file at a specific

lib/Frontend/PrintPreprocessedOutput.cpp

@@ -369,18 +369,16 @@ void PrintPPOutputPPCallbacks::MacroUndefined(const Token &MacroNameTok,
   setEmittedDirectiveOnThisLine();
 }
 
-static void outputPrintable(llvm::raw_ostream& OS,
-                                             const std::string &Str) {
-    for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-      unsigned char Char = Str[i];
-      if (isPrintable(Char) && Char != '\\' && Char != '"')
-        OS << (char)Char;
-      else  // Output anything hard as an octal escape.
-        OS << '\\'
-           << (char)('0'+ ((Char >> 6) & 7))
-           << (char)('0'+ ((Char >> 3) & 7))
-           << (char)('0'+ ((Char >> 0) & 7));
-    }
+static void outputPrintable(raw_ostream &OS, StringRef Str) {
+  for (unsigned char Char : Str) {
+    if (isPrintable(Char) && Char != '\\' && Char != '"')
+      OS << (char)Char;
+    else // Output anything hard as an octal escape.
+      OS << '\\'
+         << (char)('0' + ((Char >> 6) & 7))
+         << (char)('0' + ((Char >> 3) & 7))
+         << (char)('0' + ((Char >> 0) & 7));
+  }
 }
 
 void PrintPPOutputPPCallbacks::PragmaMessage(SourceLocation Loc,

lib/Index/CommentToXML.cpp

@@ -592,9 +592,8 @@ void getSourceTextOfDeclaration(const DeclInfo *ThisDecl,
 
 void CommentASTToXMLConverter::formatTextOfDeclaration(
     const DeclInfo *DI, SmallString<128> &Declaration) {
-  // FIXME. formatting API expects null terminated input string.
-  // There might be more efficient way of doing this.
-  std::string StringDecl = Declaration.str();
+  // Formatting API expects null terminated input string.
+  StringRef StringDecl(Declaration.c_str(), Declaration.size());
 
   // Formatter specific code.
   // Form a unique in memory buffer name.

lib/Serialization/ASTReader.cpp

@@ -3483,7 +3483,7 @@ static bool SkipCursorToBlock(BitstreamCursor &Cursor, unsigned BlockID) {
   }
 }
 
-ASTReader::ASTReadResult ASTReader::ReadAST(const std::string &FileName,
+ASTReader::ASTReadResult ASTReader::ReadAST(StringRef FileName,
                                             ModuleKind Type,
                                             SourceLocation ImportLoc,
                                             unsigned ClientLoadCapabilities) {

lib/StaticAnalyzer/Core/HTMLDiagnostics.cpp

@@ -412,13 +412,13 @@ void HTMLDiagnostics::HandlePiece(Rewriter& R, FileID BugFileID,
   // Output a maximum size.
   if (!isa<PathDiagnosticMacroPiece>(P)) {
     // Get the string and determining its maximum substring.
-    const std::string& Msg = P.getString();
+    const auto &Msg = P.getString();
     unsigned max_token = 0;
     unsigned cnt = 0;
     unsigned len = Msg.size();
 
-    for (std::string::const_iterator I=Msg.begin(), E=Msg.end(); I!=E; ++I)
-      switch (*I) {
+    for (char C : Msg)
+      switch (C) {
       default:
         ++cnt;
         continue;

lib/StaticAnalyzer/Core/PlistDiagnostics.cpp

@@ -124,7 +124,7 @@ static void ReportControlFlow(raw_ostream &o,
   --indent;
 
   // Output any helper text.
-  const std::string& s = P.getString();
+  const auto &s = P.getString();
   if (!s.empty()) {
     Indent(o, indent) << "<key>alternate</key>";
     EmitString(o, s) << '\n';

tools/driver/driver.cpp

@@ -130,7 +130,7 @@ static void ApplyOneQAOverride(raw_ostream &OS,
       }
     }
   } else if (Edit[0] == 'x' || Edit[0] == 'X') {
-    std::string Option = Edit.substr(1, std::string::npos);
+    auto Option = Edit.substr(1);
     for (unsigned i = 1; i < Args.size();) {
       if (Option == Args[i]) {
         OS << "### Deleting argument " << Args[i] << '\n';