[libcxx-commits] [libcxxabi] [llvm] [ItaniumDemangle] Remove Named flag from OperatorInfo::Member entries (PR #136862)

[Michael Buch via libcxx-commits]

https://github.com/Michael137 created https://github.com/llvm/llvm-project/pull/136862

Compilers can generate mangled names such as `_ZN1CpmEi` which we currently fail to demangle. The OperatorInfo table only marked the `pt` operator as being "named", which prevented the others from demangling properly. Removing this logic for the other kinds of member operators isn't causing any tests to fail.

>From e54c1cdd83bc0d8772d121b57006b6df18d80483 Mon Sep 17 00:00:00 2001
From: Michael Buch <michaelbuch12 at gmail.com>
Date: Wed, 23 Apr 2025 14:17:45 +0100
Subject: [PATCH] [ItaniumDemangle] Remove Named flag from OperatorInfo::Member
 entries

---
 libcxxabi/src/demangle/ItaniumDemangle.h     | 11 ++++-------
 libcxxabi/test/test_demangle.pass.cpp        |  4 ++++
 llvm/include/llvm/Demangle/ItaniumDemangle.h | 11 ++++-------
 3 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/libcxxabi/src/demangle/ItaniumDemangle.h b/libcxxabi/src/demangle/ItaniumDemangle.h
index 69932e63669bf..67cc4560f061d 100644
--- a/libcxxabi/src/demangle/ItaniumDemangle.h
+++ b/libcxxabi/src/demangle/ItaniumDemangle.h
@@ -3389,9 +3389,9 @@ const typename AbstractManglingParser<
     {"de", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator*"},
     {"dl", OperatorInfo::Del, /*Ary*/ false, Node::Prec::Unary,
      "operator delete"},
-    {"ds", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"ds", OperatorInfo::Member, false, Node::Prec::PtrMem,
      "operator.*"},
-    {"dt", OperatorInfo::Member, /*Named*/ false, Node::Prec::Postfix,
+    {"dt", OperatorInfo::Member, false, Node::Prec::Postfix,
      "operator."},
     {"dv", OperatorInfo::Binary, false, Node::Prec::Assign, "operator/"},
     {"eO", OperatorInfo::Binary, false, Node::Prec::Assign, "operator^="},
@@ -3421,11 +3421,11 @@ const typename AbstractManglingParser<
     {"or", OperatorInfo::Binary, false, Node::Prec::Ior, "operator|"},
     {"pL", OperatorInfo::Binary, false, Node::Prec::Assign, "operator+="},
     {"pl", OperatorInfo::Binary, false, Node::Prec::Additive, "operator+"},
-    {"pm", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"pm", OperatorInfo::Member, false, Node::Prec::PtrMem,
      "operator->*"},
     {"pp", OperatorInfo::Postfix, false, Node::Prec::Postfix, "operator++"},
     {"ps", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator+"},
-    {"pt", OperatorInfo::Member, /*Named*/ true, Node::Prec::Postfix,
+    {"pt", OperatorInfo::Member, false, Node::Prec::Postfix,
      "operator->"},
     {"qu", OperatorInfo::Conditional, false, Node::Prec::Conditional,
      "operator?"},
@@ -3499,9 +3499,6 @@ AbstractManglingParser<Derived, Alloc>::parseOperatorName(NameState *State) {
     if (Op->getKind() >= OperatorInfo::Unnameable)
       /* Not a nameable operator.  */
       return nullptr;
-    if (Op->getKind() == OperatorInfo::Member && !Op->getFlag())
-      /* Not a nameable MemberExpr */
-      return nullptr;
 
     return make<NameType>(Op->getName());
   }
diff --git a/libcxxabi/test/test_demangle.pass.cpp b/libcxxabi/test/test_demangle.pass.cpp
index 53da1bf6765e7..22b39fb06458d 100644
--- a/libcxxabi/test/test_demangle.pass.cpp
+++ b/libcxxabi/test/test_demangle.pass.cpp
@@ -30246,6 +30246,10 @@ const char* cases[][2] = {
 
     {"_Z3fooPU9__ptrauthILj3ELb1ELj234EEPi", "foo(int* __ptrauth<3u, true, 234u>*)"},
     {"_Z3fooIPU9__ptrauthILj1ELb0ELj64EEPiEvT_", "void foo<int* __ptrauth<1u, false, 64u>*>(int* __ptrauth<1u, false, 64u>*)"},
+
+    {"_ZN1CpmEi", "C::operator->*(int)"},
+    {"_ZN1CdtEi", "C::operator.(int)"},
+    {"_ZN1CdsEi", "C::operator.*(int)"},
     // clang-format on
 };
 
diff --git a/llvm/include/llvm/Demangle/ItaniumDemangle.h b/llvm/include/llvm/Demangle/ItaniumDemangle.h
index b4a4c72021fd1..f75e309b06e0a 100644
--- a/llvm/include/llvm/Demangle/ItaniumDemangle.h
+++ b/llvm/include/llvm/Demangle/ItaniumDemangle.h
@@ -3389,9 +3389,9 @@ const typename AbstractManglingParser<
     {"de", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator*"},
     {"dl", OperatorInfo::Del, /*Ary*/ false, Node::Prec::Unary,
      "operator delete"},
-    {"ds", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"ds", OperatorInfo::Member, false, Node::Prec::PtrMem,
      "operator.*"},
-    {"dt", OperatorInfo::Member, /*Named*/ false, Node::Prec::Postfix,
+    {"dt", OperatorInfo::Member, false, Node::Prec::Postfix,
      "operator."},
     {"dv", OperatorInfo::Binary, false, Node::Prec::Assign, "operator/"},
     {"eO", OperatorInfo::Binary, false, Node::Prec::Assign, "operator^="},
@@ -3421,11 +3421,11 @@ const typename AbstractManglingParser<
     {"or", OperatorInfo::Binary, false, Node::Prec::Ior, "operator|"},
     {"pL", OperatorInfo::Binary, false, Node::Prec::Assign, "operator+="},
     {"pl", OperatorInfo::Binary, false, Node::Prec::Additive, "operator+"},
-    {"pm", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"pm", OperatorInfo::Member, false, Node::Prec::PtrMem,
      "operator->*"},
     {"pp", OperatorInfo::Postfix, false, Node::Prec::Postfix, "operator++"},
     {"ps", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator+"},
-    {"pt", OperatorInfo::Member, /*Named*/ true, Node::Prec::Postfix,
+    {"pt", OperatorInfo::Member, false, Node::Prec::Postfix,
      "operator->"},
     {"qu", OperatorInfo::Conditional, false, Node::Prec::Conditional,
      "operator?"},
@@ -3499,9 +3499,6 @@ AbstractManglingParser<Derived, Alloc>::parseOperatorName(NameState *State) {
     if (Op->getKind() >= OperatorInfo::Unnameable)
       /* Not a nameable operator.  */
       return nullptr;
-    if (Op->getKind() == OperatorInfo::Member && !Op->getFlag())
-      /* Not a nameable MemberExpr */
-      return nullptr;
 
     return make<NameType>(Op->getName());
   }