Handle the vptr gdb case, and add test.

and remove the change in CPPLanguageRuntim.cpp.

Author: hokein

lldb/source/Plugins/LanguageRuntime/CPlusPlus/CPPLanguageRuntime.cpp

@@ -41,10 +41,7 @@ CPPLanguageRuntime::CPPLanguageRuntime(Process *process)
     : LanguageRuntime(process) {}
 
 bool CPPLanguageRuntime::IsAllowedRuntimeValue(ConstString name) {
-  // FIXME: use a list when the list grows more.
-  return name == g_this ||
-         name == ConstString("__promise") ||
-         name == ConstString("__coro_frame");
+  return name == g_this;
 }
 
 bool CPPLanguageRuntime::GetObjectDescription(Stream &str,

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp

@@ -772,7 +772,9 @@ TypeSystemClang *TypeSystemClang::GetASTContext(clang::ASTContext *ast) {
 }
 
 bool TypeSystemClang::ShouldIgnoreArtificialField(llvm::StringRef Name) {
-  return Name.starts_with("_vptr$");
+  return Name.starts_with("_vptr$")
+         // gdb emit vtable pointer as "_vptr.classname"
+         || Name.starts_with("_vptr.");
 }
 
 clang::MangleContext *TypeSystemClang::getMangleContext() {

lldb/test/Shell/SymbolFile/DWARF/ignored_artificial_fields.test

@@ -0,0 +1,17 @@
+# UNSUPPORTED: system-darwin, system-windows
+
+# Make sure the artifical field `vptr.ClassName` from gcc debug info is ignored.
+# RUN: %build --compiler=gcc %S/Inputs/debug-types-expressions.cpp -o %t
+# RUN: %lldb %t -s %s -o exit | FileCheck %s
+
+breakpoint set -n foo
+process launch
+
+# CHECK: Process {{.*}} stopped
+
+frame variable *a
+# CHECK-LABEL: frame variable *a
+# CHECK:      (B) *a = {
+# CHECK-NEXT:   A = (i = 47)
+# CHECK-NEXT:   j = 42
+# CHECK-NEXT: }