[PATCH] D123422: [AST] Cleanup on getting the underlying decl of using-shdow decl.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added a project: All.
hokein requested review of this revision.
Herald added a project: clang.

This should be a NFC cleanup. It removes a unnecessary loop to get the underlying
decl, and add an assertion.

The underlying decl of a using-shadow decl is always the original declaration
has been brought into the scope, clang never builds a nested using-shadow
decl (see Sema::BuildUsingShadowDecl).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123422

Files:
  clang/lib/AST/Decl.cpp
  clang/lib/AST/DeclCXX.cpp


Index: clang/lib/AST/DeclCXX.cpp
===================================================================
--- clang/lib/AST/DeclCXX.cpp
+++ clang/lib/AST/DeclCXX.cpp
@@ -2968,8 +2968,10 @@
                                  BaseUsingDecl *Introducer, NamedDecl *Target)
     : NamedDecl(K, DC, Loc, Name), redeclarable_base(C),
       UsingOrNextShadow(Introducer) {
-  if (Target)
+  if (Target) {
+    assert(!isa<UsingShadowDecl>(Target));
     setTargetDecl(Target);
+  }
   setImplicit();
 }
 
Index: clang/lib/AST/Decl.cpp
===================================================================
--- clang/lib/AST/Decl.cpp
+++ clang/lib/AST/Decl.cpp
@@ -1849,7 +1849,7 @@
 
 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
   NamedDecl *ND = this;
-  while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
+  if (auto *UD = dyn_cast<UsingShadowDecl>(ND))
     ND = UD->getTargetDecl();
 
   if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))


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