[Lldb-commits] [PATCH] D126080: Adapt C++ std::string dataformatter for D125496

Adrian Prantl via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Fri May 20 11:22:36 PDT 2022

aprantl created this revision.
aprantl added reviewers: ldionne, shafik, jingham.
aprantl added a project: LLDB.
Herald added a subscriber: JDevlieghere.
Herald added a project: All.
aprantl requested review of this revision.

https://reviews.llvm.org/D125496 changed the layout of std::string without updating the LLDB dataformatter. This patch adds code to recognize the now format.

How do we usually add tests for STL data structures?



Index: lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
--- lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
+++ lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
@@ -546,7 +546,7 @@
                                        nullptr, nullptr, &valobj, false, false);
-// the field layout in a libc++ string (cap, side, data or data, size, cap)
+/// The field layout in a libc++ string (cap, side, data or data, size, cap).
 enum LibcxxStringLayoutMode {
   eLibcxxStringLayoutModeCSD = 0,
   eLibcxxStringLayoutModeDSC = 1,
@@ -626,6 +626,9 @@
       return {};
     ValueObjectSP location_sp = short_sp->GetChildAtIndex(
         (layout == eLibcxxStringLayoutModeDSC) ? 0 : 1, true);
+    // After D125496, there is a flat layout.
+    if (location_sp->GetName() == g_size_name)
+      location_sp = short_sp->GetChildAtIndex(3, true);
     if (using_bitmasks)
       size = (layout == eLibcxxStringLayoutModeDSC)
                  ? size_mode_value

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