1 files changed, 88 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxRangesRefView.cpp b/contrib/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxRangesRefView.cpp
new file mode 100644
index 000000000000..01a7b8f142ec
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxRangesRefView.cpp
@@ -0,0 +1,88 @@
+//===-- LibCxxRangesRefView.cpp -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibCxx.h"
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Utility/ConstString.h"
+#include "llvm/ADT/APSInt.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+namespace lldb_private {
+namespace formatters {
+
+class LibcxxStdRangesRefViewSyntheticFrontEnd
+    : public SyntheticChildrenFrontEnd {
+public:
+  LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~LibcxxStdRangesRefViewSyntheticFrontEnd() override = default;
+
+  llvm::Expected<uint32_t> CalculateNumChildren() override {
+    // __range_ will be the sole child of this type
+    return 1;
+  }
+
+  lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override {
+    // Since we only have a single child, return it
+    assert(idx == 0);
+    return m_range_sp;
+  }
+
+  lldb::ChildCacheState Update() override;
+
+  bool MightHaveChildren() override { return true; }
+
+  size_t GetIndexOfChildWithName(ConstString name) override {
+    // We only have a single child
+    return 0;
+  }
+
+private:
+  /// Pointer to the dereferenced __range_ member
+  lldb::ValueObjectSP m_range_sp = nullptr;
+};
+
+lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::
+    LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp) {
+  if (valobj_sp)
+    Update();
+}
+
+lldb::ChildCacheState
+lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::Update() {
+  ValueObjectSP range_ptr =
+      GetChildMemberWithName(m_backend, {ConstString("__range_")});
+  if (!range_ptr)
+    return lldb::ChildCacheState::eRefetch;
+
+  lldb_private::Status error;
+  m_range_sp = range_ptr->Dereference(error);
+
+  return error.Success() ? lldb::ChildCacheState::eReuse
+                         : lldb::ChildCacheState::eRefetch;
+}
+
+lldb_private::SyntheticChildrenFrontEnd *
+LibcxxStdRangesRefViewSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                               lldb::ValueObjectSP valobj_sp) {
+  if (!valobj_sp)
+    return nullptr;
+  CompilerType type = valobj_sp->GetCompilerType();
+  if (!type.IsValid())
+    return nullptr;
+  return new LibcxxStdRangesRefViewSyntheticFrontEnd(valobj_sp);
+}
+
+} // namespace formatters
+} // namespace lldb_private