[NFC][Clang][AST] Use llvm::copy instead of memcpy in StringLiteral

Also change the constructor and `StringLiteral::Create` to take
an `ArrayRef<SourceLocation>` instead of a pointer and size, so that
it can be directly passed to `llvm::copy`. This also eliminates the need
of a specialized single location constructor and also simplifies
existing calls to `StringLiteral::Create`.

Author: jurahul

clang/include/clang/AST/Expr.h

@@ -1834,8 +1834,7 @@ class StringLiteral final
 
   /// Build a string literal.
   StringLiteral(const ASTContext &Ctx, StringRef Str, StringLiteralKind Kind,
-                bool Pascal, QualType Ty, const SourceLocation *Loc,
-                unsigned NumConcatenated);
+                bool Pascal, QualType Ty, ArrayRef<SourceLocation> Locs);
 
   /// Build an empty string literal.
   StringLiteral(EmptyShell Empty, unsigned NumConcatenated, unsigned Length,
@@ -1853,18 +1852,11 @@ class StringLiteral final
 
 public:
   /// This is the "fully general" constructor that allows representation of
-  /// strings formed from multiple concatenated tokens.
+  /// strings formed from multiple concatenated tokens. This same constructor
+  /// also work for a single token case.
   static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
                                StringLiteralKind Kind, bool Pascal, QualType Ty,
-                               const SourceLocation *Loc,
-                               unsigned NumConcatenated);
-
-  /// Simple constructor for string literals made from one token.
-  static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
-                               StringLiteralKind Kind, bool Pascal, QualType Ty,
-                               SourceLocation Loc) {
-    return Create(Ctx, Str, Kind, Pascal, Ty, &Loc, 1);
-  }
+                               ArrayRef<SourceLocation> Locs);
 
   /// Construct an empty string literal.
   static StringLiteral *CreateEmpty(const ASTContext &Ctx,

clang/lib/AST/ASTImporter.cpp

@@ -7695,9 +7695,9 @@ ExpectedStmt ASTNodeImporter::VisitStringLiteral(StringLiteral *E) {
       E->tokloc_begin(), E->tokloc_end(), ToLocations.begin()))
     return std::move(Err);
 
-  return StringLiteral::Create(
-      Importer.getToContext(), E->getBytes(), E->getKind(), E->isPascal(),
-      *ToTypeOrErr, ToLocations.data(), ToLocations.size());
+  return StringLiteral::Create(Importer.getToContext(), E->getBytes(),
+                               E->getKind(), E->isPascal(), *ToTypeOrErr,
+                               ToLocations);
 }
 
 ExpectedStmt ASTNodeImporter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {

clang/lib/AST/Expr.cpp

@@ -1123,14 +1123,13 @@ unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
 
 StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
                              StringLiteralKind Kind, bool Pascal, QualType Ty,
-                             const SourceLocation *Loc,
-                             unsigned NumConcatenated)
+                             ArrayRef<SourceLocation> Locs)
     : Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary) {
 
   unsigned Length = Str.size();
 
   StringLiteralBits.Kind = llvm::to_underlying(Kind);
-  StringLiteralBits.NumConcatenated = NumConcatenated;
+  StringLiteralBits.NumConcatenated = Locs.size();
 
   if (Kind != StringLiteralKind::Unevaluated) {
     assert(Ctx.getAsConstantArrayType(Ty) &&
@@ -1169,11 +1168,10 @@ StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
 
   // Initialize the trailing array of SourceLocation.
   // This is safe since SourceLocation is POD-like.
-  std::memcpy(getTrailingObjects<SourceLocation>(), Loc,
-              NumConcatenated * sizeof(SourceLocation));
+  llvm::copy(Locs, getTrailingObjects<SourceLocation>());
 
   // Initialize the trailing array of char holding the string data.
-  std::memcpy(getTrailingObjects<char>(), Str.data(), Str.size());
+  llvm::copy(Str, getTrailingObjects<char>());
 
   setDependence(ExprDependence::None);
 }
@@ -1188,13 +1186,12 @@ StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
 
 StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
                                      StringLiteralKind Kind, bool Pascal,
-                                     QualType Ty, const SourceLocation *Loc,
-                                     unsigned NumConcatenated) {
+                                     QualType Ty,
+                                     ArrayRef<SourceLocation> Locs) {
   void *Mem = Ctx.Allocate(totalSizeToAlloc<unsigned, SourceLocation, char>(
-                               1, NumConcatenated, Str.size()),
+                               1, Locs.size(), Str.size()),
                            alignof(StringLiteral));
-  return new (Mem)
-      StringLiteral(Ctx, Str, Kind, Pascal, Ty, Loc, NumConcatenated);
+  return new (Mem) StringLiteral(Ctx, Str, Kind, Pascal, Ty, Locs);
 }
 
 StringLiteral *StringLiteral::CreateEmpty(const ASTContext &Ctx,
@@ -4406,7 +4403,7 @@ void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
 
   this->ShuffleVectorExprBits.NumExprs = Exprs.size();
   SubExprs = new (C) Stmt *[ShuffleVectorExprBits.NumExprs];
-  memcpy(SubExprs, Exprs.data(), sizeof(Expr *) * Exprs.size());
+  llvm::copy(Exprs, SubExprs);
 }
 
 GenericSelectionExpr::GenericSelectionExpr(

clang/lib/Sema/SemaExpr.cpp

@@ -2070,9 +2070,9 @@ ExprResult Sema::ActOnUnevaluatedStringLiteral(ArrayRef<Token> StringToks) {
   for (const Token &Tok : StringToks)
     StringTokLocs.push_back(Tok.getLocation());
 
-  StringLiteral *Lit = StringLiteral::Create(
-      Context, Literal.GetString(), StringLiteralKind::Unevaluated, false, {},
-      &StringTokLocs[0], StringTokLocs.size());
+  StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
+                                             StringLiteralKind::Unevaluated,
+                                             false, {}, StringTokLocs);
 
   if (!Literal.getUDSuffix().empty()) {
     SourceLocation UDSuffixLoc =
@@ -2206,10 +2206,8 @@ Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) {
       Context.getStringLiteralArrayType(CharTy, Literal.GetNumStringChars());
 
   // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
-  StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
-                                             Kind, Literal.Pascal, StrTy,
-                                             &StringTokLocs[0],
-                                             StringTokLocs.size());
+  StringLiteral *Lit = StringLiteral::Create(
+      Context, Literal.GetString(), Kind, Literal.Pascal, StrTy, StringTokLocs);
   if (Literal.getUDSuffix().empty())
     return Lit;
 
@@ -3793,7 +3791,7 @@ ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
       Expr *Lit =
           StringLiteral::Create(Context, StringRef(TokSpelling.data(), Length),
                                 StringLiteralKind::Ordinary,
-                                /*Pascal*/ false, StrTy, &TokLoc, 1);
+                                /*Pascal*/ false, StrTy, TokLoc);
       return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
     }
 

clang/lib/Sema/SemaExprObjC.cpp

@@ -74,8 +74,7 @@ ExprResult SemaObjC::ParseObjCStringLiteral(SourceLocation *AtLocs,
         CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1), nullptr,
         CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
     S = StringLiteral::Create(Context, StrBuf, StringLiteralKind::Ordinary,
-                              /*Pascal=*/false, StrTy, &StrLocs[0],
-                              StrLocs.size());
+                              /*Pascal=*/false, StrTy, StrLocs);
   }
 
   return BuildObjCStringLiteral(AtLocs[0], S);