[clangd] Support OverloadExpr in findExplicitReferences

clang-tools-extra/clangd/FindTarget.cpp

 #include "Logger.h"
 #include "clang/AST/ASTTypeTraits.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/DeclVisitor.h"
 #include "clang/AST/DeclarationName.h"
 #include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
 #include "clang/AST/NestedNameSpecifier.h"
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/AST/Type.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeLocVisitor.h"
void VisitDeclRefExpr(const DeclRefExpr *E) {
           E->getQualifierLoc(), E->getNameInfo().getLoc(), {E->getFoundDecl()}};
     }
 
     void VisitMemberExpr(const MemberExpr *E) {
       Ref = ReferenceLoc{E->getQualifierLoc(),
                          E->getMemberNameInfo().getLoc(),
                          {E->getFoundDecl()}};
     }
+
+    void VisitOverloadExpr(const OverloadExpr *E) {
+      Ref = ReferenceLoc{E->getQualifierLoc(), E->getNameInfo().getLoc(),
+                         llvm::SmallVector<const NamedDecl *, 1>(
+                             E->decls().begin(), E->decls().end())};
+    }
   };
 
   Visitor V;
   V.Visit(E);
   return V.Ref;
 }
 
 Optional<ReferenceLoc> refInTypeLoc(TypeLoc L) {

clang-tools-extra/clangd/unittests/FindTargetTests.cpp

 //===-- FindSymbolsTests.cpp -------------------------*- C++ -*------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #include "FindTarget.h"
 
 #include "Selection.h"
 #include "TestTU.h"
 #include "clang/AST/Decl.h"
+#include "clang/AST/DeclTemplate.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Casting.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Testing/Support/Annotations.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include <initializer_list>
 
 namespace clang {
 namespace clangd {
protected:
   /// Parses \p Code, finds function '::foo' and annotates its body with results
   /// of findExplicitReferecnces.
   /// See actual tests for examples of annotation format.
   AllRefs annotateReferencesInFoo(llvm::StringRef Code) {
     TestTU TU;
     TU.Code = Code;
 
     auto AST = TU.build();
-    auto &Func = llvm::cast<FunctionDecl>(findDecl(AST, "foo"));
+
+    auto *TestDecl = &findDecl(AST, "foo");
+    if (auto *T = llvm::dyn_cast<FunctionTemplateDecl>(TestDecl))
+      TestDecl = T->getTemplatedDecl();
+    auto &Func = llvm::cast<FunctionDecl>(*TestDecl);
 
     std::vector<ReferenceLoc> Refs;
     findExplicitReferences(Func.getBody(), [&Refs](ReferenceLoc R) {
       Refs.push_back(std::move(R));
     });
 
     auto &SM = AST.getSourceManager();
     llvm::sort(Refs, [&](const ReferenceLoc &L, const ReferenceLoc &R) {
std::pair</*Code*/ llvm::StringRef, /*References*/ llvm::StringRef> Cases[] =
             void foo() {
               for (int x : $0^vector()) {
                 $1^x = 10;
               }
             }
         )cpp",
            "0: targets = {vector}\n"
            "1: targets = {x}\n"},
+          // Handle UnresolvedLookupExpr.
+          {R"cpp(
+            namespace ns1 { void func(char*); }
+            namespace ns2 { void func(int*); }
+            using namespace ns1;
+            using namespace ns2;
+
+            template <class T>
+            void foo(T t) {
+              $0^func($1^t);
+            }
+        )cpp",
+           "0: targets = {ns1::func, ns2::func}\n"
+           "1: targets = {t}\n"},
+          // Handle UnresolvedMemberExpr.
+          {R"cpp(
+            struct X {
+              void func(char*);
+              void func(int*);
+            };
+
+            template <class T>
+            void foo(X x, T t) {
+              $0^x.$1^func($2^t);
+            }
+        )cpp",
+           "0: targets = {x}\n"
+           "1: targets = {X::func, X::func}\n"
+           "2: targets = {t}\n"},
       };
 
   for (const auto &C : Cases) {
     llvm::StringRef ExpectedCode = C.first;
     llvm::StringRef ExpectedRefs = C.second;
 
     auto Actual =
         annotateReferencesInFoo(llvm::Annotations(ExpectedCode).code());
     EXPECT_EQ(ExpectedCode, Actual.AnnotatedCode);
     EXPECT_EQ(ExpectedRefs, Actual.DumpedReferences) << ExpectedCode;
   }
 }
 
 } // namespace
 } // namespace clangd
 } // namespace clang