[clang] [clang][CodeComplete] Use HeuristicResolver to resolve CXXDependentScopeMemberExpr (PR #124888)

[Nathan Ridge via cfe-commits]

https://github.com/HighCommander4 updated https://github.com/llvm/llvm-project/pull/124888

>From a28c3b66cfe3d12b05c45fdf9dc40ee961439c2e Mon Sep 17 00:00:00 2001
From: Nathan Ridge <zeratul976 at hotmail.com>
Date: Sun, 26 Jan 2025 01:30:28 -0500
Subject: [PATCH] [clang][CodeComplete] Use HeuristicResolver to resolve
 CXXDependentScopeMemberExpr

---
 clang/lib/Sema/SemaCodeComplete.cpp         | 21 ++++-----------------
 clang/test/CodeCompletion/member-access.cpp | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index f10f7f4768f8e8..80ae87e7c5725c 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -5796,24 +5796,11 @@ QualType getApproximateType(const Expr *E, HeuristicResolver &Resolver) {
         return QualType(Common, 0);
     }
   }
-  // A dependent member: approximate-resolve the base, then lookup.
+  // A dependent member: resolve using HeuristicResolver.
   if (const auto *CDSME = llvm::dyn_cast<CXXDependentScopeMemberExpr>(E)) {
-    QualType Base = CDSME->isImplicitAccess()
-                        ? CDSME->getBaseType()
-                        : getApproximateType(CDSME->getBase(), Resolver);
-    if (CDSME->isArrow() && !Base.isNull())
-      Base = Base->getPointeeType(); // could handle unique_ptr etc here?
-    auto *RD =
-        Base.isNull()
-            ? nullptr
-            : llvm::dyn_cast_or_null<CXXRecordDecl>(getAsRecordDecl(Base));
-    if (RD && RD->isCompleteDefinition()) {
-      // Look up member heuristically, including in bases.
-      for (const auto *Member : RD->lookupDependentName(
-               CDSME->getMember(), [](const NamedDecl *Member) {
-                 return llvm::isa<ValueDecl>(Member);
-               })) {
-        return llvm::cast<ValueDecl>(Member)->getType().getNonReferenceType();
+    for (const auto *Member : Resolver.resolveMemberExpr(CDSME)) {
+      if (const auto *VD = dyn_cast<ValueDecl>(Member)) {
+        return VD->getType().getNonReferenceType();
       }
     }
   }
diff --git a/clang/test/CodeCompletion/member-access.cpp b/clang/test/CodeCompletion/member-access.cpp
index bf35f7ad021f71..b181466cdb6287 100644
--- a/clang/test/CodeCompletion/member-access.cpp
+++ b/clang/test/CodeCompletion/member-access.cpp
@@ -417,3 +417,21 @@ void f() {
   // CHECK-DEPENDENT-NESTEDCLASS: [#int#]field
 }
 }
+
+namespace template_alias {
+struct A {
+  int b;
+};
+template <typename T>
+struct S {
+  A a;
+};
+template <typename T>
+using Alias = S<T>;
+template <typename T>
+void f(Alias<T> s) {
+  s.a.b;
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:433:7 %s -o - | FileCheck -check-prefix=CHECK-TEMPLATE-ALIAS %s
+  // CHECK-TEMPLATE-ALIAS: [#int#]b
+}
+}