[LLDB] Add formatters for MSVC STL std::(forward_)list (#148285)

Adds synthetic providers for MSVC's `std::forward_list` and `std::list`.
It refactors `LibCxxList` to be generic over the STL type (currently
libc++ or MSVC STL). The libstdc++ synthetic providers use something
similar in Python
[here](https://github.com/llvm/llvm-project/blob/3092b765ba0b2d20bd716944dda86ea8e4ad12e3/lldb/examples/synthetic/gnu_libstdcpp.py#L134).
Eventually, this could be ported to C++ as well.

Towards #24834.

Author: Nerixyz

lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt

@@ -14,11 +14,11 @@ add_lldb_library(lldbPluginCPlusPlusLanguage PLUGIN
   CxxStringTypes.cpp
   Generic.cpp
   GenericBitset.cpp
+  GenericList.cpp
   GenericOptional.cpp
   LibCxx.cpp
   LibCxxAtomic.cpp
   LibCxxInitializerList.cpp
-  LibCxxList.cpp
   LibCxxMap.cpp
   LibCxxQueue.cpp
   LibCxxRangesRefView.cpp

lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp

@@ -1440,14 +1440,12 @@ static void LoadLibStdcppFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
           stl_deref_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdUnorderedMapSynthProvider")));
   cpp_category_sp->AddTypeSynthetic(
-      "^std::((__debug::)?|(__cxx11::)?)list<.+>(( )?&)?$",
-      eFormatterMatchRegex,
+      "^std::__(debug|cxx11)::list<.+>(( )?&)?$", eFormatterMatchRegex,
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_deref_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdListSynthProvider")));
   cpp_category_sp->AddTypeSynthetic(
-      "^std::((__debug::)?|(__cxx11::)?)forward_list<.+>(( )?&)?$",
-      eFormatterMatchRegex,
+      "^std::__(debug|cxx11)::forward_list<.+>(( )?&)?$", eFormatterMatchRegex,
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_synth_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdForwardListSynthProvider")));
@@ -1501,15 +1499,13 @@ static void LoadLibStdcppFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
                 "^std::(__debug::)?unordered_(multi)?(map|set)<.+> >$",
                 stl_summary_flags, true);
 
-  AddCXXSummary(cpp_category_sp,
-                lldb_private::formatters::ContainerSizeSummaryProvider,
-                "libstdc++ std::list summary provider",
-                "^std::((__debug::)?|(__cxx11::)?)list<.+>(( )?&)?$",
-                stl_summary_flags, true);
+  AddCXXSummary(
+      cpp_category_sp, lldb_private::formatters::ContainerSizeSummaryProvider,
+      "libstdc++ debug std::list summary provider",
+      "^std::__(debug|cxx11)::list<.+>(( )?&)?$", stl_summary_flags, true);
 
   cpp_category_sp->AddTypeSummary(
-      "^std::((__debug::)?|(__cxx11::)?)forward_list<.+>(( )?&)?$",
-      eFormatterMatchRegex,
+      "^std::__(debug|cxx11)::forward_list<.+>(( )?&)?$", eFormatterMatchRegex,
       TypeSummaryImplSP(new ScriptSummaryFormat(
           stl_summary_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.ForwardListSummaryProvider")));
@@ -1627,6 +1623,31 @@ GenericVectorSyntheticFrontEndCreator(CXXSyntheticChildren *children,
       "lldb.formatters.cpp.gnu_libstdcpp.StdVectorSynthProvider", *valobj_sp);
 }
 
+static SyntheticChildrenFrontEnd *
+GenericListSyntheticFrontEndCreator(CXXSyntheticChildren *children,
+                                    lldb::ValueObjectSP valobj_sp) {
+  if (!valobj_sp)
+    return nullptr;
+
+  if (IsMsvcStlList(*valobj_sp))
+    return MsvcStlListSyntheticFrontEndCreator(children, valobj_sp);
+  return new ScriptedSyntheticChildren::FrontEnd(
+      "lldb.formatters.cpp.gnu_libstdcpp.StdListSynthProvider", *valobj_sp);
+}
+
+static SyntheticChildrenFrontEnd *
+GenericForwardListSyntheticFrontEndCreator(CXXSyntheticChildren *children,
+                                           lldb::ValueObjectSP valobj_sp) {
+  if (!valobj_sp)
+    return nullptr;
+
+  if (IsMsvcStlList(*valobj_sp))
+    return MsvcStlForwardListSyntheticFrontEndCreator(children, valobj_sp);
+  return new ScriptedSyntheticChildren::FrontEnd(
+      "lldb.formatters.cpp.gnu_libstdcpp.StdForwardListSynthProvider",
+      *valobj_sp);
+}
+
 /// Load formatters that are formatting types from more than one STL
 static void LoadCommonStlFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
   if (!cpp_category_sp)
@@ -1685,6 +1706,12 @@ static void LoadCommonStlFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
   AddCXXSynthetic(cpp_category_sp, GenericTupleSyntheticFrontEndCreator,
                   "std::tuple synthetic children", "^std::tuple<.*>(( )?&)?$",
                   stl_synth_flags, true);
+  AddCXXSynthetic(cpp_category_sp, GenericListSyntheticFrontEndCreator,
+                  "std::list synthetic children", "^std::list<.+>(( )?&)?$",
+                  stl_synth_flags, true);
+  AddCXXSynthetic(cpp_category_sp, GenericForwardListSyntheticFrontEndCreator,
+                  "std::forward_list synthetic children",
+                  "^std::forward_list<.+>(( )?&)?$", stl_synth_flags, true);
 
   AddCXXSummary(cpp_category_sp, GenericSmartPointerSummaryProvider,
                 "MSVC STL/libstdc++ std::shared_ptr summary provider",
@@ -1704,6 +1731,14 @@ static void LoadCommonStlFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {
   AddCXXSynthetic(cpp_category_sp, GenericVectorSyntheticFrontEndCreator,
                   "MSVC/libstdc++ std::vector synthetic provider",
                   "^std::vector<.+>(( )?&)?$", stl_synth_flags, true);
+  AddCXXSummary(cpp_category_sp, ContainerSizeSummaryProvider,
+                "MSVC STL/libstdc++ std::list summary provider",
+                "^std::list<.+>(( )?&)?$", stl_summary_flags, true);
+  cpp_category_sp->AddTypeSummary(
+      "^std::forward_list<.+>(( )?&)?$", eFormatterMatchRegex,
+      TypeSummaryImplSP(new ScriptSummaryFormat(
+          stl_summary_flags,
+          "lldb.formatters.cpp.gnu_libstdcpp.ForwardListSummaryProvider")));
 }
 
 static void LoadMsvcStlFormatters(lldb::TypeCategoryImplSP cpp_category_sp) {