From 5b8968cc599eb6100bb73ae87be9d6cd2577ac9e Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 15 Jul 2011 16:25:15 +0000
Subject: [PATCH] Store bracket locations for array subscript expressions, from
 Erik Verbruggen!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135275 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/AST/Expr.h  |  5 +++--
 lib/Sema/SemaOverload.cpp | 11 ++++++++---
 lib/Sema/TreeTransform.h  | 23 ++++++++++++++++++-----
 3 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/include/clang/AST/Expr.h b/include/clang/AST/Expr.h
index 11e384f5a2..c7f870725c 100644
--- a/include/clang/AST/Expr.h
+++ b/include/clang/AST/Expr.h
@@ -797,9 +797,10 @@ class DeclRefExpr : public Expr {
   void computeDependence();
 
 public:
-  DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L)
+  DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L,
+              const DeclarationNameLoc &LocInfo = DeclarationNameLoc())
     : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
-      D(D), Loc(L) {
+      D(D), Loc(L), DNLoc(LocInfo) {
     DeclRefExprBits.HasQualifier = 0;
     DeclRefExprBits.HasExplicitTemplateArgs = 0;
     DeclRefExprBits.HasFoundDecl = 0;
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index b95b886efb..437b2b5c6d 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -38,8 +38,10 @@ using namespace sema;
 /// function.
 static ExprResult
 CreateFunctionRefExpr(Sema &S, FunctionDecl *Fn,
-                      SourceLocation Loc = SourceLocation()) {
-  ExprResult E = S.Owned(new (S.Context) DeclRefExpr(Fn, Fn->getType(), VK_LValue, Loc));
+                      SourceLocation Loc = SourceLocation(), 
+                      const DeclarationNameLoc &LocInfo = DeclarationNameLoc()){
+  ExprResult E = S.Owned(new (S.Context) DeclRefExpr(Fn, Fn->getType(), 
+                                                     VK_LValue, Loc, LocInfo));
   E = S.DefaultFunctionArrayConversion(E.take());
   if (E.isInvalid())
     return ExprError();
@@ -8878,7 +8880,10 @@ Sema::CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
         ResultTy = ResultTy.getNonLValueExprType(Context);
 
         // Build the actual expression node.
-        ExprResult FnExpr = CreateFunctionRefExpr(*this, FnDecl, LLoc);
+        DeclarationNameLoc LocInfo;
+        LocInfo.CXXOperatorName.BeginOpNameLoc = LLoc.getRawEncoding();
+        LocInfo.CXXOperatorName.EndOpNameLoc = RLoc.getRawEncoding();
+        ExprResult FnExpr = CreateFunctionRefExpr(*this, FnDecl, LLoc, LocInfo);
         if (FnExpr.isInvalid())
           return ExprError();
 
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 0530b5a172..fa87217821 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -8357,11 +8357,24 @@ TreeTransform<Derived>::RebuildCXXOperatorCallExpr(OverloadedOperatorKind Op,
     return SemaRef.CreateOverloadedUnaryOp(OpLoc, Opc, Functions, First);
   }
 
-  if (Op == OO_Subscript)
-    return SemaRef.CreateOverloadedArraySubscriptExpr(Callee->getLocStart(),
-                                                      OpLoc,
-                                                      First,
-                                                      Second);
+  if (Op == OO_Subscript) {
+    SourceLocation LBrace;
+    SourceLocation RBrace;
+
+    if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Callee)) {
+        DeclarationNameLoc &NameLoc = DRE->getNameInfo().getInfo();
+        LBrace = SourceLocation::getFromRawEncoding(
+                    NameLoc.CXXOperatorName.BeginOpNameLoc);
+        RBrace = SourceLocation::getFromRawEncoding(
+                    NameLoc.CXXOperatorName.EndOpNameLoc);
+    } else {
+        LBrace = Callee->getLocStart();
+        RBrace = OpLoc;
+    }
+
+    return SemaRef.CreateOverloadedArraySubscriptExpr(LBrace, RBrace,
+                                                      First, Second);
+  }
 
   // Create the overloaded operator invocation for binary operators.
   BinaryOperatorKind Opc = BinaryOperator::getOverloadedOpcode(Op);
-- 
2.40.0