1 files changed, 831 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Language/ObjC/NSSet.cpp b/contrib/llvm-project/lldb/source/Plugins/Language/ObjC/NSSet.cpp
new file mode 100644
index 000000000000..7d0a6a507211
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/Language/ObjC/NSSet.cpp
@@ -0,0 +1,831 @@
+//===-- NSSet.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 "NSSet.h"
+#include "CFBasicHash.h"
+
+#include "Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntime.h"
+#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Target/Language.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/DataBufferHeap.h"
+#include "lldb/Utility/Endian.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/Utility/Stream.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+std::map<ConstString, CXXFunctionSummaryFormat::Callback> &
+NSSet_Additionals::GetAdditionalSummaries() {
+  static std::map<ConstString, CXXFunctionSummaryFormat::Callback> g_map;
+  return g_map;
+}
+
+std::map<ConstString, CXXSyntheticChildren::CreateFrontEndCallback> &
+NSSet_Additionals::GetAdditionalSynthetics() {
+  static std::map<ConstString, CXXSyntheticChildren::CreateFrontEndCallback>
+      g_map;
+  return g_map;
+}
+
+namespace lldb_private {
+namespace formatters {
+class NSSetISyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  NSSetISyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~NSSetISyntheticFrontEnd() override;
+
+  llvm::Expected<uint32_t> CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
+
+  lldb::ChildCacheState Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(ConstString name) override;
+
+private:
+  struct DataDescriptor_32 {
+    uint32_t _used : 26;
+    uint32_t _szidx : 6;
+  };
+
+  struct DataDescriptor_64 {
+    uint64_t _used : 58;
+    uint32_t _szidx : 6;
+  };
+
+  struct SetItemDescriptor {
+    lldb::addr_t item_ptr;
+    lldb::ValueObjectSP valobj_sp;
+  };
+
+  ExecutionContextRef m_exe_ctx_ref;
+  uint8_t m_ptr_size = 8;
+  DataDescriptor_32 *m_data_32 = nullptr;
+  DataDescriptor_64 *m_data_64 = nullptr;
+  lldb::addr_t m_data_ptr = LLDB_INVALID_ADDRESS;
+  std::vector<SetItemDescriptor> m_children;
+};
+
+class NSCFSetSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  NSCFSetSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  llvm::Expected<uint32_t> CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
+
+  lldb::ChildCacheState Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(ConstString name) override;
+
+private:
+  struct SetItemDescriptor {
+    lldb::addr_t item_ptr;
+    lldb::ValueObjectSP valobj_sp;
+  };
+
+  ExecutionContextRef m_exe_ctx_ref;
+  uint8_t m_ptr_size = 8;
+  lldb::ByteOrder m_order = lldb::eByteOrderInvalid;
+
+  CFBasicHash m_hashtable;
+
+  CompilerType m_pair_type;
+  std::vector<SetItemDescriptor> m_children;
+};
+
+template <typename D32, typename D64>
+class GenericNSSetMSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  GenericNSSetMSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~GenericNSSetMSyntheticFrontEnd() override;
+
+  llvm::Expected<uint32_t> CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
+
+  lldb::ChildCacheState Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(ConstString name) override;
+
+private:
+
+  struct SetItemDescriptor {
+    lldb::addr_t item_ptr;
+    lldb::ValueObjectSP valobj_sp;
+  };
+
+  ExecutionContextRef m_exe_ctx_ref;
+  uint8_t m_ptr_size = 8;
+  D32 *m_data_32;
+  D64 *m_data_64;
+  std::vector<SetItemDescriptor> m_children;
+};
+  
+namespace Foundation1300 {
+  struct DataDescriptor_32 {
+    uint32_t _used : 26;
+    uint32_t _size;
+    uint32_t _mutations;
+    uint32_t _objs_addr;
+  };
+  
+  struct DataDescriptor_64 {
+    uint64_t _used : 58;
+    uint64_t _size;
+    uint64_t _mutations;
+    uint64_t _objs_addr;
+  };
+  
+  using NSSetMSyntheticFrontEnd =
+      GenericNSSetMSyntheticFrontEnd<DataDescriptor_32, DataDescriptor_64>;
+}
+  
+namespace Foundation1428 {
+  struct DataDescriptor_32 {
+    uint32_t _used : 26;
+    uint32_t _size;
+    uint32_t _objs_addr;
+    uint32_t _mutations;
+  };
+  
+  struct DataDescriptor_64 {
+    uint64_t _used : 58;
+    uint64_t _size;
+    uint64_t _objs_addr;
+    uint64_t _mutations;
+  };
+  
+  using NSSetMSyntheticFrontEnd =
+      GenericNSSetMSyntheticFrontEnd<DataDescriptor_32, DataDescriptor_64>;
+}
+  
+namespace Foundation1437 {
+  struct DataDescriptor_32 {
+    uint32_t _cow;
+    // __table storage
+    uint32_t _objs_addr;
+    uint32_t _muts;
+    uint32_t _used : 26;
+    uint32_t _szidx : 6;
+  };
+  
+  struct DataDescriptor_64 {
+    uint64_t _cow;
+    // __Table storage
+    uint64_t _objs_addr;
+    uint32_t _muts;
+    uint32_t _used : 26;
+    uint32_t _szidx : 6;
+  };
+  
+  using NSSetMSyntheticFrontEnd =
+      GenericNSSetMSyntheticFrontEnd<DataDescriptor_32, DataDescriptor_64>;
+  
+  template <typename DD>
+  uint64_t
+  __NSSetMSize_Impl(lldb_private::Process &process, lldb::addr_t valobj_addr,
+                    Status &error) {
+    const lldb::addr_t start_of_descriptor =
+        valobj_addr + process.GetAddressByteSize();
+    DD descriptor = DD();
+    process.ReadMemory(start_of_descriptor, &descriptor, sizeof(descriptor),
+                       error);
+    if (error.Fail()) {
+      return 0;
+    }
+    return descriptor._used;
+  }
+  
+  uint64_t
+  __NSSetMSize(lldb_private::Process &process, lldb::addr_t valobj_addr,
+               Status &error) {
+    if (process.GetAddressByteSize() == 4) {
+      return __NSSetMSize_Impl<DataDescriptor_32>(process, valobj_addr, error);
+    } else {
+      return __NSSetMSize_Impl<DataDescriptor_64>(process, valobj_addr, error);
+    }
+  }
+}
+  
+class NSSetCodeRunningSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  NSSetCodeRunningSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~NSSetCodeRunningSyntheticFrontEnd() override;
+
+  llvm::Expected<uint32_t> CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
+
+  lldb::ChildCacheState Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(ConstString name) override;
+};
+} // namespace formatters
+} // namespace lldb_private
+
+template <bool cf_style>
+bool lldb_private::formatters::NSSetSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  static constexpr llvm::StringLiteral g_TypeHint("NSSet");
+
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process_sp);
+
+  if (!runtime)
+    return false;
+
+  ObjCLanguageRuntime::ClassDescriptorSP descriptor(
+      runtime->GetClassDescriptor(valobj));
+
+  if (!descriptor || !descriptor->IsValid())
+    return false;
+
+  uint32_t ptr_size = process_sp->GetAddressByteSize();
+  bool is_64bit = (ptr_size == 8);
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  uint64_t value = 0;
+
+  ConstString class_name(descriptor->GetClassName());
+
+  static const ConstString g_SetI("__NSSetI");
+  static const ConstString g_OrderedSetI("__NSOrderedSetI");
+  static const ConstString g_SetM("__NSSetM");
+  static const ConstString g_SetCF("__NSCFSet");
+  static const ConstString g_SetCFRef("CFSetRef");
+
+  if (class_name.IsEmpty())
+    return false;
+
+  if (class_name == g_SetI || class_name == g_OrderedSetI) {
+    Status error;
+    value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size,
+                                                      ptr_size, 0, error);
+    if (error.Fail())
+      return false;
+    value &= (is_64bit ? ~0xFC00000000000000UL : ~0xFC000000U);
+  } else if (class_name == g_SetM) {
+    AppleObjCRuntime *apple_runtime =
+        llvm::dyn_cast_or_null<AppleObjCRuntime>(runtime);
+    Status error;
+    if (apple_runtime && apple_runtime->GetFoundationVersion() >= 1437) {
+      value = Foundation1437::__NSSetMSize(*process_sp, valobj_addr, error);
+    } else {
+      value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size,
+                                                        ptr_size, 0, error);
+      value &= (is_64bit ? ~0xFC00000000000000UL : ~0xFC000000U);
+    }
+    if (error.Fail())
+      return false;
+  } else if (class_name == g_SetCF || class_name == g_SetCFRef) {
+    ExecutionContext exe_ctx(process_sp);
+    CFBasicHash cfbh;
+    if (!cfbh.Update(valobj_addr, exe_ctx))
+      return false;
+    value = cfbh.GetCount();
+  } else {
+    auto &map(NSSet_Additionals::GetAdditionalSummaries());
+    auto iter = map.find(class_name), end = map.end();
+    if (iter != end)
+      return iter->second(valobj, stream, options);
+    else
+      return false;
+  }
+
+  llvm::StringRef prefix, suffix;
+  if (Language *language = Language::FindPlugin(options.GetLanguage()))
+    std::tie(prefix, suffix) = language->GetFormatterPrefixSuffix(g_TypeHint);
+
+  stream << prefix;
+  stream.Printf("%" PRIu64 " %s%s", value, "element", value == 1 ? "" : "s");
+  stream << suffix;
+  return true;
+}
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::NSSetSyntheticFrontEndCreator(
+    CXXSyntheticChildren *synth, lldb::ValueObjectSP valobj_sp) {
+  lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
+  if (!process_sp)
+    return nullptr;
+  ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process_sp);
+  if (!runtime)
+    return nullptr;
+
+  CompilerType valobj_type(valobj_sp->GetCompilerType());
+  Flags flags(valobj_type.GetTypeInfo());
+
+  if (flags.IsClear(eTypeIsPointer)) {
+    Status error;
+    valobj_sp = valobj_sp->AddressOf(error);
+    if (error.Fail() || !valobj_sp)
+      return nullptr;
+  }
+
+  ObjCLanguageRuntime::ClassDescriptorSP descriptor(
+      runtime->GetClassDescriptor(*valobj_sp));
+
+  if (!descriptor || !descriptor->IsValid())
+    return nullptr;
+
+  ConstString class_name = descriptor->GetClassName();
+
+  static const ConstString g_SetI("__NSSetI");
+  static const ConstString g_OrderedSetI("__NSOrderedSetI");
+  static const ConstString g_SetM("__NSSetM");
+  static const ConstString g_SetCF("__NSCFSet");
+  static const ConstString g_SetCFRef("CFSetRef");
+
+  if (class_name.IsEmpty())
+    return nullptr;
+
+  if (class_name == g_SetI || class_name == g_OrderedSetI) {
+    return (new NSSetISyntheticFrontEnd(valobj_sp));
+  } else if (class_name == g_SetM) {
+    AppleObjCRuntime *apple_runtime =
+        llvm::dyn_cast_or_null<AppleObjCRuntime>(runtime);
+    if (apple_runtime) {
+      if (apple_runtime->GetFoundationVersion() >= 1437)
+        return (new Foundation1437::NSSetMSyntheticFrontEnd(valobj_sp));
+      else if (apple_runtime->GetFoundationVersion() >= 1428)
+        return (new Foundation1428::NSSetMSyntheticFrontEnd(valobj_sp));
+      else
+        return (new Foundation1300::NSSetMSyntheticFrontEnd(valobj_sp));
+    } else {
+      return (new Foundation1300::NSSetMSyntheticFrontEnd(valobj_sp));
+    }
+  } else if (class_name == g_SetCF || class_name == g_SetCFRef) {
+    return (new NSCFSetSyntheticFrontEnd(valobj_sp));
+  } else {
+    auto &map(NSSet_Additionals::GetAdditionalSynthetics());
+    auto iter = map.find(class_name), end = map.end();
+    if (iter != end)
+      return iter->second(synth, valobj_sp);
+    return nullptr;
+  }
+}
+
+lldb_private::formatters::NSSetISyntheticFrontEnd::NSSetISyntheticFrontEnd(
+    lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_exe_ctx_ref() {
+  if (valobj_sp)
+    Update();
+}
+
+lldb_private::formatters::NSSetISyntheticFrontEnd::~NSSetISyntheticFrontEnd() {
+  delete m_data_32;
+  m_data_32 = nullptr;
+  delete m_data_64;
+  m_data_64 = nullptr;
+}
+
+size_t
+lldb_private::formatters::NSSetISyntheticFrontEnd::GetIndexOfChildWithName(
+    ConstString name) {
+  const char *item_name = name.GetCString();
+  uint32_t idx = ExtractIndexFromString(item_name);
+  if (idx < UINT32_MAX && idx >= CalculateNumChildrenIgnoringErrors())
+    return UINT32_MAX;
+  return idx;
+}
+
+llvm::Expected<uint32_t>
+lldb_private::formatters::NSSetISyntheticFrontEnd::CalculateNumChildren() {
+  if (!m_data_32 && !m_data_64)
+    return 0;
+  return (m_data_32 ? m_data_32->_used : m_data_64->_used);
+}
+
+lldb::ChildCacheState
+lldb_private::formatters::NSSetISyntheticFrontEnd::Update() {
+  m_children.clear();
+  delete m_data_32;
+  m_data_32 = nullptr;
+  delete m_data_64;
+  m_data_64 = nullptr;
+  m_ptr_size = 0;
+  ValueObjectSP valobj_sp = m_backend.GetSP();
+  if (!valobj_sp)
+    return lldb::ChildCacheState::eRefetch;
+  if (!valobj_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
+  lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
+  if (!process_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_ptr_size = process_sp->GetAddressByteSize();
+  uint64_t data_location = valobj_sp->GetValueAsUnsigned(0) + m_ptr_size;
+  Status error;
+  if (m_ptr_size == 4) {
+    m_data_32 = new DataDescriptor_32();
+    process_sp->ReadMemory(data_location, m_data_32, sizeof(DataDescriptor_32),
+                           error);
+  } else {
+    m_data_64 = new DataDescriptor_64();
+    process_sp->ReadMemory(data_location, m_data_64, sizeof(DataDescriptor_64),
+                           error);
+  }
+  if (error.Fail())
+    return lldb::ChildCacheState::eRefetch;
+  m_data_ptr = data_location + m_ptr_size;
+  return lldb::ChildCacheState::eReuse;
+}
+
+bool lldb_private::formatters::NSSetISyntheticFrontEnd::MightHaveChildren() {
+  return true;
+}
+
+lldb::ValueObjectSP
+lldb_private::formatters::NSSetISyntheticFrontEnd::GetChildAtIndex(
+    uint32_t idx) {
+  uint32_t num_children = CalculateNumChildrenIgnoringErrors();
+
+  if (idx >= num_children)
+    return lldb::ValueObjectSP();
+
+  ProcessSP process_sp = m_exe_ctx_ref.GetProcessSP();
+  if (!process_sp)
+    return lldb::ValueObjectSP();
+
+  if (m_children.empty()) {
+    // do the scan phase
+    lldb::addr_t obj_at_idx = 0;
+
+    uint32_t tries = 0;
+    uint32_t test_idx = 0;
+
+    while (tries < num_children) {
+      obj_at_idx = m_data_ptr + (test_idx * m_ptr_size);
+      if (!process_sp)
+        return lldb::ValueObjectSP();
+      Status error;
+      obj_at_idx = process_sp->ReadPointerFromMemory(obj_at_idx, error);
+      if (error.Fail())
+        return lldb::ValueObjectSP();
+
+      test_idx++;
+
+      if (!obj_at_idx)
+        continue;
+      tries++;
+
+      SetItemDescriptor descriptor = {obj_at_idx, lldb::ValueObjectSP()};
+
+      m_children.push_back(descriptor);
+    }
+  }
+
+  if (idx >= m_children.size()) // should never happen
+    return lldb::ValueObjectSP();
+
+  SetItemDescriptor &set_item = m_children[idx];
+  if (!set_item.valobj_sp) {
+    auto ptr_size = process_sp->GetAddressByteSize();
+    DataBufferHeap buffer(ptr_size, 0);
+    switch (ptr_size) {
+    case 0: // architecture has no clue - fail
+      return lldb::ValueObjectSP();
+    case 4:
+      *reinterpret_cast<uint32_t *>(buffer.GetBytes()) =
+          static_cast<uint32_t>(set_item.item_ptr);
+      break;
+    case 8:
+      *reinterpret_cast<uint64_t *>(buffer.GetBytes()) =
+          static_cast<uint64_t>(set_item.item_ptr);
+      break;
+    default:
+      lldbassert(false && "pointer size is not 4 nor 8");
+    }
+    StreamString idx_name;
+    idx_name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+
+    DataExtractor data(buffer.GetBytes(), buffer.GetByteSize(),
+                       process_sp->GetByteOrder(),
+                       process_sp->GetAddressByteSize());
+
+    set_item.valobj_sp = CreateValueObjectFromData(
+        idx_name.GetString(), data, m_exe_ctx_ref,
+        m_backend.GetCompilerType().GetBasicTypeFromAST(
+            lldb::eBasicTypeObjCID));
+  }
+  return set_item.valobj_sp;
+}
+
+lldb_private::formatters::NSCFSetSyntheticFrontEnd::NSCFSetSyntheticFrontEnd(
+    lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_exe_ctx_ref(), m_hashtable(),
+      m_pair_type() {}
+
+size_t
+lldb_private::formatters::NSCFSetSyntheticFrontEnd::GetIndexOfChildWithName(
+    ConstString name) {
+  const char *item_name = name.GetCString();
+  const uint32_t idx = ExtractIndexFromString(item_name);
+  if (idx < UINT32_MAX && idx >= CalculateNumChildrenIgnoringErrors())
+    return UINT32_MAX;
+  return idx;
+}
+
+llvm::Expected<uint32_t>
+lldb_private::formatters::NSCFSetSyntheticFrontEnd::CalculateNumChildren() {
+  if (!m_hashtable.IsValid())
+    return 0;
+  return m_hashtable.GetCount();
+}
+
+lldb::ChildCacheState
+lldb_private::formatters::NSCFSetSyntheticFrontEnd::Update() {
+  m_children.clear();
+  ValueObjectSP valobj_sp = m_backend.GetSP();
+  m_ptr_size = 0;
+  if (!valobj_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
+
+  lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
+  if (!process_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_ptr_size = process_sp->GetAddressByteSize();
+  m_order = process_sp->GetByteOrder();
+  return m_hashtable.Update(valobj_sp->GetValueAsUnsigned(0), m_exe_ctx_ref)
+             ? lldb::ChildCacheState::eReuse
+             : lldb::ChildCacheState::eRefetch;
+}
+
+bool lldb_private::formatters::NSCFSetSyntheticFrontEnd::MightHaveChildren() {
+  return true;
+}
+
+lldb::ValueObjectSP
+lldb_private::formatters::NSCFSetSyntheticFrontEnd::GetChildAtIndex(
+    uint32_t idx) {
+  lldb::addr_t m_values_ptr = m_hashtable.GetValuePointer();
+
+  const uint32_t num_children = CalculateNumChildrenIgnoringErrors();
+
+  if (idx >= num_children)
+    return lldb::ValueObjectSP();
+
+  if (m_children.empty()) {
+    ProcessSP process_sp = m_exe_ctx_ref.GetProcessSP();
+    if (!process_sp)
+      return lldb::ValueObjectSP();
+
+    Status error;
+    lldb::addr_t val_at_idx = 0;
+
+    uint32_t tries = 0;
+    uint32_t test_idx = 0;
+
+    // Iterate over inferior memory, reading value pointers by shifting the
+    // cursor by test_index * m_ptr_size. Returns an empty ValueObject if a read
+    // fails, otherwise, continue until the number of tries matches the number
+    // of childen.
+    while (tries < num_children) {
+      val_at_idx = m_values_ptr + (test_idx * m_ptr_size);
+
+      val_at_idx = process_sp->ReadPointerFromMemory(val_at_idx, error);
+      if (error.Fail())
+        return lldb::ValueObjectSP();
+
+      test_idx++;
+
+      if (!val_at_idx)
+        continue;
+      tries++;
+
+      SetItemDescriptor descriptor = {val_at_idx, lldb::ValueObjectSP()};
+
+      m_children.push_back(descriptor);
+    }
+  }
+
+  if (idx >= m_children.size()) // should never happen
+    return lldb::ValueObjectSP();
+
+  SetItemDescriptor &set_item = m_children[idx];
+  if (!set_item.valobj_sp) {
+
+    WritableDataBufferSP buffer_sp(new DataBufferHeap(m_ptr_size, 0));
+
+    switch (m_ptr_size) {
+    case 0: // architecture has no clue - fail
+      return lldb::ValueObjectSP();
+    case 4:
+      *reinterpret_cast<uint32_t *>(buffer_sp->GetBytes()) =
+          static_cast<uint32_t>(set_item.item_ptr);
+      break;
+    case 8:
+      *reinterpret_cast<uint64_t *>(buffer_sp->GetBytes()) =
+          static_cast<uint64_t>(set_item.item_ptr);
+      break;
+    default:
+      lldbassert(false && "pointer size is not 4 nor 8");
+    }
+    StreamString idx_name;
+    idx_name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+
+    DataExtractor data(buffer_sp, m_order, m_ptr_size);
+
+    set_item.valobj_sp = CreateValueObjectFromData(
+        idx_name.GetString(), data, m_exe_ctx_ref,
+        m_backend.GetCompilerType().GetBasicTypeFromAST(
+            lldb::eBasicTypeObjCID));
+  }
+
+  return set_item.valobj_sp;
+}
+
+template <typename D32, typename D64>
+lldb_private::formatters::GenericNSSetMSyntheticFrontEnd<
+    D32, D64>::GenericNSSetMSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_exe_ctx_ref(),
+      m_data_32(nullptr), m_data_64(nullptr) {
+  if (valobj_sp)
+    Update();
+}
+
+template <typename D32, typename D64>
+lldb_private::formatters::GenericNSSetMSyntheticFrontEnd<D32, D64>::
+    GenericNSSetMSyntheticFrontEnd::~GenericNSSetMSyntheticFrontEnd() {
+  delete m_data_32;
+  m_data_32 = nullptr;
+  delete m_data_64;
+  m_data_64 = nullptr;
+}
+
+template <typename D32, typename D64>
+size_t
+lldb_private::formatters::
+  GenericNSSetMSyntheticFrontEnd<D32, D64>::GetIndexOfChildWithName(
+    ConstString name) {
+  const char *item_name = name.GetCString();
+  uint32_t idx = ExtractIndexFromString(item_name);
+  if (idx < UINT32_MAX && idx >= CalculateNumChildrenIgnoringErrors())
+    return UINT32_MAX;
+  return idx;
+}
+
+template <typename D32, typename D64>
+llvm::Expected<uint32_t>
+lldb_private::formatters::GenericNSSetMSyntheticFrontEnd<
+    D32, D64>::CalculateNumChildren() {
+  if (!m_data_32 && !m_data_64)
+    return 0;
+  return (m_data_32 ? (uint32_t)m_data_32->_used : (uint32_t)m_data_64->_used);
+}
+
+template <typename D32, typename D64>
+lldb::ChildCacheState
+lldb_private::formatters::GenericNSSetMSyntheticFrontEnd<D32, D64>::Update() {
+  m_children.clear();
+  ValueObjectSP valobj_sp = m_backend.GetSP();
+  m_ptr_size = 0;
+  delete m_data_32;
+  m_data_32 = nullptr;
+  delete m_data_64;
+  m_data_64 = nullptr;
+  if (!valobj_sp)
+    return lldb::ChildCacheState::eRefetch;
+  if (!valobj_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
+  lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
+  if (!process_sp)
+    return lldb::ChildCacheState::eRefetch;
+  m_ptr_size = process_sp->GetAddressByteSize();
+  uint64_t data_location = valobj_sp->GetValueAsUnsigned(0) + m_ptr_size;
+  Status error;
+  if (m_ptr_size == 4) {
+    m_data_32 = new D32();
+    process_sp->ReadMemory(data_location, m_data_32, sizeof(D32),
+                           error);
+  } else {
+    m_data_64 = new D64();
+    process_sp->ReadMemory(data_location, m_data_64, sizeof(D64),
+                           error);
+  }
+  return error.Success() ? lldb::ChildCacheState::eReuse
+                         : lldb::ChildCacheState::eRefetch;
+}
+
+template <typename D32, typename D64>
+bool
+lldb_private::formatters::
+  GenericNSSetMSyntheticFrontEnd<D32, D64>::MightHaveChildren() {
+  return true;
+}
+
+template <typename D32, typename D64>
+lldb::ValueObjectSP
+lldb_private::formatters::
+  GenericNSSetMSyntheticFrontEnd<D32, D64>::GetChildAtIndex(uint32_t idx) {
+  lldb::addr_t m_objs_addr =
+      (m_data_32 ? m_data_32->_objs_addr : m_data_64->_objs_addr);
+
+  uint32_t num_children = CalculateNumChildrenIgnoringErrors();
+
+  if (idx >= num_children)
+    return lldb::ValueObjectSP();
+
+  ProcessSP process_sp = m_exe_ctx_ref.GetProcessSP();
+  if (!process_sp)
+    return lldb::ValueObjectSP();
+
+  if (m_children.empty()) {
+    // do the scan phase
+    lldb::addr_t obj_at_idx = 0;
+
+    uint32_t tries = 0;
+    uint32_t test_idx = 0;
+
+    while (tries < num_children) {
+      obj_at_idx = m_objs_addr + (test_idx * m_ptr_size);
+      if (!process_sp)
+        return lldb::ValueObjectSP();
+      Status error;
+      obj_at_idx = process_sp->ReadPointerFromMemory(obj_at_idx, error);
+      if (error.Fail())
+        return lldb::ValueObjectSP();
+
+      test_idx++;
+
+      if (!obj_at_idx)
+        continue;
+      tries++;
+
+      SetItemDescriptor descriptor = {obj_at_idx, lldb::ValueObjectSP()};
+
+      m_children.push_back(descriptor);
+    }
+  }
+
+  if (idx >= m_children.size()) // should never happen
+    return lldb::ValueObjectSP();
+
+  SetItemDescriptor &set_item = m_children[idx];
+  if (!set_item.valobj_sp) {
+    auto ptr_size = process_sp->GetAddressByteSize();
+    DataBufferHeap buffer(ptr_size, 0);
+    switch (ptr_size) {
+    case 0: // architecture has no clue?? - fail
+      return lldb::ValueObjectSP();
+    case 4:
+      *((uint32_t *)buffer.GetBytes()) = (uint32_t)set_item.item_ptr;
+      break;
+    case 8:
+      *((uint64_t *)buffer.GetBytes()) = (uint64_t)set_item.item_ptr;
+      break;
+    default:
+      assert(false && "pointer size is not 4 nor 8 - get out of here ASAP");
+    }
+    StreamString idx_name;
+    idx_name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+
+    DataExtractor data(buffer.GetBytes(), buffer.GetByteSize(),
+                       process_sp->GetByteOrder(),
+                       process_sp->GetAddressByteSize());
+
+    set_item.valobj_sp = CreateValueObjectFromData(
+        idx_name.GetString(), data, m_exe_ctx_ref,
+        m_backend.GetCompilerType().GetBasicTypeFromAST(
+            lldb::eBasicTypeObjCID));
+  }
+  return set_item.valobj_sp;
+}
+
+template bool lldb_private::formatters::NSSetSummaryProvider<true>(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options);
+
+template bool lldb_private::formatters::NSSetSummaryProvider<false>(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options);