[lldb][DataFormatter] Format libstdc++ unique_ptr like we do libc++ (#146909)

The only difference is that with libc++ the summary string contains the
derefernced pointer value. With libstdc++ we currently display the
pointer itself, which seems redundant. E.g.,
```
(std::unique_ptr<int>) iup = 0x55555556d2b0 {
  pointer = 0x000055555556d2b0
}
(std::unique_ptr<std::basic_string<char> >) sup = 0x55555556d2d0 {
  pointer = "foobar"
}
```

This patch moves the logic into a common helper that's shared between
the libc++ and libstdc++ formatters.

After this patch we can combine the libc++ and libstdc++ API tests (see
https://github.com/llvm/llvm-project/pull/146740).

1 files changed, 19 insertions, 0 deletions

diff --git a/lldb/source/DataFormatters/FormattersHelpers.cpp b/lldb/source/DataFormatters/FormattersHelpers.cpp
index d7b058d91c4a..81c76b06fc47 100644
--- a/lldb/source/DataFormatters/FormattersHelpers.cpp
+++ b/lldb/source/DataFormatters/FormattersHelpers.cpp
@@ -126,3 +126,22 @@ lldb_private::formatters::GetArrayAddressOrPointerValue(ValueObject &valobj) {
 
   return data_addr.address;
 }
+
+void lldb_private::formatters::DumpCxxSmartPtrPointerSummary(
+    Stream &stream, ValueObject &ptr, const TypeSummaryOptions &options) {
+  if (ptr.GetValueAsUnsigned(0) == 0) {
+    stream.Printf("nullptr");
+    return;
+  }
+
+  Status error;
+  ValueObjectSP pointee_sp = ptr.Dereference(error);
+  if (!pointee_sp || !error.Success())
+    return;
+
+  if (!pointee_sp->DumpPrintableRepresentation(
+          stream, ValueObject::eValueObjectRepresentationStyleSummary,
+          lldb::eFormatInvalid,
+          ValueObject::PrintableRepresentationSpecialCases::eDisable, false))
+    stream.Printf("ptr = 0x%" PRIx64, ptr.GetValueAsUnsigned(0));
+}