2 files changed, 18 insertions, 6 deletions
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
index 66b3a746b9e..3a8bc2087f8 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
@@ -298,6 +298,15 @@ ValueObjectSP ForwardListFrontEnd::GetChildAtIndex(size_t idx) {
                                    m_element_type);
 }
 
+static ValueObjectSP GetValueOfCompressedPair(ValueObject &pair) {
+  ValueObjectSP value = pair.GetChildMemberWithName(ConstString("__value_"), true);
+  if (! value) {
+    // pre-r300140 member name
+    value = pair.GetChildMemberWithName(ConstString("__first_"), true);
+  }
+  return value;
+}
+
 bool ForwardListFrontEnd::Update() {
   AbstractListFrontEnd::Update();
 
@@ -310,7 +319,7 @@ bool ForwardListFrontEnd::Update() {
       m_backend.GetChildMemberWithName(ConstString("__before_begin_"), true));
   if (!impl_sp)
     return false;
-  impl_sp = impl_sp->GetChildMemberWithName(ConstString("__first_"), true);
+  impl_sp = GetValueOfCompressedPair(*impl_sp);
   if (!impl_sp)
     return false;
   m_head = impl_sp->GetChildMemberWithName(ConstString("__next_"), true).get();
@@ -331,10 +340,9 @@ size_t ListFrontEnd::CalculateNumChildren() {
   ValueObjectSP size_alloc(
       m_backend.GetChildMemberWithName(ConstString("__size_alloc_"), true));
   if (size_alloc) {
-    ValueObjectSP first(
-        size_alloc->GetChildMemberWithName(ConstString("__first_"), true));
-    if (first) {
-      m_count = first->GetValueAsUnsigned(UINT32_MAX);
+    ValueObjectSP value = GetValueOfCompressedPair(*size_alloc);
+    if (value) {
+      m_count = value->GetValueAsUnsigned(UINT32_MAX);
     }
   }
   if (m_count != UINT32_MAX) {
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
index aaf90605171..9b412a12f53 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
@@ -38,7 +38,11 @@ private:
 
 bool TupleFrontEnd::Update() {
   m_elements.clear();
-  m_base_sp = m_backend.GetChildMemberWithName(ConstString("base_"), true);
+  m_base_sp = m_backend.GetChildMemberWithName(ConstString("__base_"), true);
+  if (! m_base_sp) {
+    // Pre r304382 name of the base element.
+    m_base_sp = m_backend.GetChildMemberWithName(ConstString("base_"), true);
+  }
   if (! m_base_sp)
     return false;
   m_elements.assign(m_base_sp->GetCompilerType().GetNumDirectBaseClasses(),