Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 1135 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Plugins/Language/ObjC/Cocoa.cpp b/gnu/llvm/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
new file mode 100644
index 00000000000..8a81abbaedb
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
@@ -0,0 +1,1135 @@
+//===-- Cocoa.cpp -----------------------------------------------*- C++ -*-===//
+//
+// 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 "Cocoa.h"
+
+#include "lldb/Core/Mangled.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/DataFormatters/StringPrinter.h"
+#include "lldb/DataFormatters/TypeSummary.h"
+#include "lldb/Host/Time.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Target/Language.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/ProcessStructReader.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"
+
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/bit.h"
+
+#include "Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntime.h"
+
+#include "NSString.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+bool lldb_private::formatters::NSBundleSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  if (class_name == "NSBundle") {
+    uint64_t offset = 5 * ptr_size;
+    ValueObjectSP text(valobj.GetSyntheticChildAtOffset(
+        offset,
+        valobj.GetCompilerType().GetBasicTypeFromAST(lldb::eBasicTypeObjCID),
+        true));
+
+    StreamString summary_stream;
+    bool was_nsstring_ok =
+        NSStringSummaryProvider(*text, summary_stream, options);
+    if (was_nsstring_ok && summary_stream.GetSize() > 0) {
+      stream.Printf("%s", summary_stream.GetData());
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool lldb_private::formatters::NSTimeZoneSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  if (class_name == "__NSTimeZone") {
+    uint64_t offset = ptr_size;
+    ValueObjectSP text(valobj.GetSyntheticChildAtOffset(
+        offset, valobj.GetCompilerType(), true));
+    StreamString summary_stream;
+    bool was_nsstring_ok =
+        NSStringSummaryProvider(*text, summary_stream, options);
+    if (was_nsstring_ok && summary_stream.GetSize() > 0) {
+      stream.Printf("%s", summary_stream.GetData());
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool lldb_private::formatters::NSNotificationSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  if (class_name == "NSConcreteNotification") {
+    uint64_t offset = ptr_size;
+    ValueObjectSP text(valobj.GetSyntheticChildAtOffset(
+        offset, valobj.GetCompilerType(), true));
+    StreamString summary_stream;
+    bool was_nsstring_ok =
+        NSStringSummaryProvider(*text, summary_stream, options);
+    if (was_nsstring_ok && summary_stream.GetSize() > 0) {
+      stream.Printf("%s", summary_stream.GetData());
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool lldb_private::formatters::NSMachPortSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  uint64_t port_number = 0;
+
+  if (class_name == "NSMachPort") {
+    uint64_t offset = (ptr_size == 4 ? 12 : 20);
+    Status error;
+    port_number = process_sp->ReadUnsignedIntegerFromMemory(
+        offset + valobj_addr, 4, 0, error);
+    if (error.Success()) {
+      stream.Printf("mach port: %u",
+                    (uint32_t)(port_number & 0x00000000FFFFFFFF));
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool lldb_private::formatters::NSIndexSetSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  uint64_t count = 0;
+
+  do {
+    if (class_name == "NSIndexSet" || class_name == "NSMutableIndexSet") {
+      Status error;
+      uint32_t mode = process_sp->ReadUnsignedIntegerFromMemory(
+          valobj_addr + ptr_size, 4, 0, error);
+      if (error.Fail())
+        return false;
+      // this means the set is empty - count = 0
+      if ((mode & 1) == 1) {
+        count = 0;
+        break;
+      }
+      if ((mode & 2) == 2)
+        mode = 1; // this means the set only has one range
+      else
+        mode = 2; // this means the set has multiple ranges
+      if (mode == 1) {
+        count = process_sp->ReadUnsignedIntegerFromMemory(
+            valobj_addr + 3 * ptr_size, ptr_size, 0, error);
+        if (error.Fail())
+          return false;
+      } else {
+        // read a pointer to the data at 2*ptr_size
+        count = process_sp->ReadUnsignedIntegerFromMemory(
+            valobj_addr + 2 * ptr_size, ptr_size, 0, error);
+        if (error.Fail())
+          return false;
+        // read the data at 2*ptr_size from the first location
+        count = process_sp->ReadUnsignedIntegerFromMemory(count + 2 * ptr_size,
+                                                          ptr_size, 0, error);
+        if (error.Fail())
+          return false;
+      }
+    } else
+      return false;
+  } while (false);
+  stream.Printf("%" PRIu64 " index%s", count, (count == 1 ? "" : "es"));
+  return true;
+}
+
+static void NSNumber_FormatChar(ValueObject &valobj, Stream &stream, char value,
+                                lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:char");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%hhd%s", prefix.c_str(), value, suffix.c_str());
+}
+
+static void NSNumber_FormatShort(ValueObject &valobj, Stream &stream,
+                                 short value, lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:short");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%hd%s", prefix.c_str(), value, suffix.c_str());
+}
+
+static void NSNumber_FormatInt(ValueObject &valobj, Stream &stream, int value,
+                               lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:int");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%d%s", prefix.c_str(), value, suffix.c_str());
+}
+
+static void NSNumber_FormatLong(ValueObject &valobj, Stream &stream,
+                                uint64_t value, lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:long");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%" PRId64 "%s", prefix.c_str(), value, suffix.c_str());
+}
+
+static void NSNumber_FormatInt128(ValueObject &valobj, Stream &stream,
+                                 const llvm::APInt &value,
+                                 lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:int128_t");
+  
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+  
+  stream.PutCString(prefix.c_str());
+  const int radix = 10;
+  const bool isSigned = true;
+  std::string str = value.toString(radix, isSigned);
+  stream.PutCString(str.c_str());
+  stream.PutCString(suffix.c_str());
+}
+
+static void NSNumber_FormatFloat(ValueObject &valobj, Stream &stream,
+                                 float value, lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:float");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%f%s", prefix.c_str(), value, suffix.c_str());
+}
+
+static void NSNumber_FormatDouble(ValueObject &valobj, Stream &stream,
+                                  double value, lldb::LanguageType lang) {
+  static ConstString g_TypeHint("NSNumber:double");
+
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(lang)) {
+    if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix,
+                                            suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+
+  stream.Printf("%s%g%s", prefix.c_str(), value, suffix.c_str());
+}
+
+bool lldb_private::formatters::NSNumberSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name(descriptor->GetClassName().GetCString());
+
+  if (class_name.empty())
+    return false;
+
+  if (class_name == "__NSCFBoolean")
+    return ObjCBooleanSummaryProvider(valobj, stream, options);
+
+  if (class_name == "NSDecimalNumber")
+    return NSDecimalNumberSummaryProvider(valobj, stream, options);
+
+  if (class_name == "NSNumber" || class_name == "__NSCFNumber") {
+    uint64_t value = 0;
+    uint64_t i_bits = 0;
+    if (descriptor->GetTaggedPointerInfo(&i_bits, &value)) {
+      switch (i_bits) {
+      case 0:
+        NSNumber_FormatChar(valobj, stream, (char)value, options.GetLanguage());
+        break;
+      case 1:
+      case 4:
+        NSNumber_FormatShort(valobj, stream, (short)value,
+                             options.GetLanguage());
+        break;
+      case 2:
+      case 8:
+        NSNumber_FormatInt(valobj, stream, (int)value, options.GetLanguage());
+        break;
+      case 3:
+      case 12:
+        NSNumber_FormatLong(valobj, stream, value, options.GetLanguage());
+        break;
+      default:
+        return false;
+      }
+      return true;
+    } else {
+      Status error;
+
+      AppleObjCRuntime *runtime = llvm::dyn_cast_or_null<AppleObjCRuntime>(
+          ObjCLanguageRuntime::Get(*process_sp));
+
+      const bool new_format =
+          (runtime && runtime->GetFoundationVersion() >= 1400);
+
+      enum class TypeCodes : int {
+        sint8 = 0x0,
+        sint16 = 0x1,
+        sint32 = 0x2,
+        sint64 = 0x3,
+        f32 = 0x4,
+        f64 = 0x5,
+        sint128 = 0x6
+      };
+      
+      uint64_t data_location = valobj_addr + 2 * ptr_size;
+      TypeCodes type_code;
+      
+      if (new_format) {
+        uint64_t cfinfoa =
+            process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size,
+                                                      ptr_size, 0, error);
+        
+        if (error.Fail())
+          return false;
+
+        bool is_preserved_number = cfinfoa & 0x8;
+        if (is_preserved_number) {
+          lldbassert(!static_cast<bool>("We should handle preserved numbers!"));
+          return false;
+        }
+
+        type_code = static_cast<TypeCodes>(cfinfoa & 0x7);
+      } else {
+        uint8_t data_type =
+        process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + ptr_size, 1,
+                                                  0, error) & 0x1F;
+        
+        if (error.Fail())
+          return false;
+        
+        switch (data_type) {
+          case 1: type_code = TypeCodes::sint8; break;
+          case 2: type_code = TypeCodes::sint16; break;
+          case 3: type_code = TypeCodes::sint32; break;
+          case 17: data_location += 8; LLVM_FALLTHROUGH;
+          case 4: type_code = TypeCodes::sint64; break;
+          case 5: type_code = TypeCodes::f32; break;
+          case 6: type_code = TypeCodes::f64; break;
+          default: return false;
+        }
+      }
+      
+      uint64_t value = 0;
+      bool success = false;
+      switch (type_code) {
+        case TypeCodes::sint8:
+        value = process_sp->ReadUnsignedIntegerFromMemory(data_location, 1, 0,
+                                                          error);
+        if (error.Fail())
+          return false;
+        NSNumber_FormatChar(valobj, stream, (char)value, options.GetLanguage());
+        success = true;
+        break;
+        case TypeCodes::sint16:
+        value = process_sp->ReadUnsignedIntegerFromMemory(data_location, 2, 0,
+                                                          error);
+        if (error.Fail())
+          return false;
+        NSNumber_FormatShort(valobj, stream, (short)value,
+                             options.GetLanguage());
+        success = true;
+        break;
+      case TypeCodes::sint32:
+        value = process_sp->ReadUnsignedIntegerFromMemory(data_location, 4, 0,
+                                                          error);
+        if (error.Fail())
+          return false;
+        NSNumber_FormatInt(valobj, stream, (int)value, options.GetLanguage());
+        success = true;
+        break;
+      case TypeCodes::sint64:
+        value = process_sp->ReadUnsignedIntegerFromMemory(data_location, 8, 0,
+                                                          error);
+        if (error.Fail())
+          return false;
+        NSNumber_FormatLong(valobj, stream, value, options.GetLanguage());
+        success = true;
+        break;
+      case TypeCodes::f32:
+      {
+        uint32_t flt_as_int = process_sp->ReadUnsignedIntegerFromMemory(
+            data_location, 4, 0, error);
+        if (error.Fail())
+          return false;
+        float flt_value = 0.0f;
+        memcpy(&flt_value, &flt_as_int, sizeof(flt_as_int));
+        NSNumber_FormatFloat(valobj, stream, flt_value, options.GetLanguage());
+        success = true;
+        break;
+      }
+      case TypeCodes::f64:
+      {
+        uint64_t dbl_as_lng = process_sp->ReadUnsignedIntegerFromMemory(
+            data_location, 8, 0, error);
+        if (error.Fail())
+          return false;
+        double dbl_value = 0.0;
+        memcpy(&dbl_value, &dbl_as_lng, sizeof(dbl_as_lng));
+        NSNumber_FormatDouble(valobj, stream, dbl_value, options.GetLanguage());
+        success = true;
+        break;
+      }
+      case TypeCodes::sint128: // internally, this is the same
+      {
+        uint64_t words[2];
+        words[1] = process_sp->ReadUnsignedIntegerFromMemory(
+            data_location, 8, 0, error);
+        if (error.Fail())
+          return false;
+        words[0] = process_sp->ReadUnsignedIntegerFromMemory(
+            data_location + 8, 8, 0, error);
+        if (error.Fail())
+          return false;
+        llvm::APInt i128_value(128, words);
+        NSNumber_FormatInt128(valobj, stream, i128_value, options.GetLanguage());
+        success = true;
+        break;
+      }
+      }
+      return success;
+    }
+  }
+
+  return false;
+}
+
+bool lldb_private::formatters::NSDecimalNumberSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+  uint32_t ptr_size = process_sp->GetAddressByteSize();
+
+  Status error;
+  int8_t exponent = process_sp->ReadUnsignedIntegerFromMemory(
+      valobj_addr + ptr_size, 1, 0, error);
+  if (error.Fail())
+    return false;
+
+  uint8_t length_and_negative = process_sp->ReadUnsignedIntegerFromMemory(
+      valobj_addr + ptr_size + 1, 1, 0, error);
+  if (error.Fail())
+    return false;
+
+  // Fifth bit marks negativity.
+  const bool is_negative = (length_and_negative >> 4) & 1;
+
+  // Zero length and negative means NaN.
+  uint8_t length = length_and_negative & 0xf;
+  const bool is_nan = is_negative && (length == 0);
+
+  if (is_nan) {
+    stream.Printf("NaN");
+    return true;
+  }
+
+  if (length == 0) {
+    stream.Printf("0");
+    return true;
+  }
+
+  uint64_t mantissa = process_sp->ReadUnsignedIntegerFromMemory(
+      valobj_addr + ptr_size + 4, 8, 0, error);
+  if (error.Fail())
+    return false;
+
+  if (is_negative)
+    stream.Printf("-");
+
+  stream.Printf("%" PRIu64 " x 10^%" PRIi8, mantissa, exponent);
+  return true;
+}
+
+bool lldb_private::formatters::NSURLSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  llvm::StringRef class_name = descriptor->GetClassName().GetStringRef();
+
+  if (!class_name.equals("NSURL"))
+    return false;
+
+  uint64_t offset_text = ptr_size + ptr_size +
+                         8; // ISA + pointer + 8 bytes of data (even on 32bit)
+  uint64_t offset_base = offset_text + ptr_size;
+  CompilerType type(valobj.GetCompilerType());
+  ValueObjectSP text(valobj.GetSyntheticChildAtOffset(offset_text, type, true));
+  ValueObjectSP base(valobj.GetSyntheticChildAtOffset(offset_base, type, true));
+  if (!text || text->GetValueAsUnsigned(0) == 0)
+    return false;
+
+  StreamString base_summary;
+  if (base && base->GetValueAsUnsigned(0)) {
+    if (!NSURLSummaryProvider(*base, base_summary, options))
+      base_summary.Clear();
+  }
+  if (base_summary.Empty())
+    return NSStringSummaryProvider(*text, stream, options);
+
+  StreamString summary;
+  if (!NSStringSummaryProvider(*text, summary, options) || summary.Empty())
+    return false;
+
+  const char quote_char = '"';
+  std::string prefix, suffix;
+  if (Language *language = Language::FindPlugin(options.GetLanguage())) {
+    if (!language->GetFormatterPrefixSuffix(*text, ConstString("NSString"),
+                                            prefix, suffix)) {
+      prefix.clear();
+      suffix.clear();
+    }
+  }
+  // @"A" -> @"A
+  llvm::StringRef summary_str = summary.GetString();
+  bool back_consumed = summary_str.consume_back(quote_char + suffix);
+  assert(back_consumed);
+  UNUSED_IF_ASSERT_DISABLED(back_consumed);
+  // @"B" -> B"
+  llvm::StringRef base_summary_str = base_summary.GetString();
+  bool front_consumed = base_summary_str.consume_front(prefix + quote_char);
+  assert(front_consumed);
+  UNUSED_IF_ASSERT_DISABLED(front_consumed);
+  // @"A -- B"
+  if (!summary_str.empty() && !base_summary_str.empty()) {
+    stream.Printf("%s -- %s", summary_str.str().c_str(),
+                  base_summary_str.str().c_str());
+    return true;
+  }
+
+  return false;
+}
+
+/// Bias value for tagged pointer exponents.
+/// Recommended values:
+/// 0x3e3: encodes all dates between distantPast and distantFuture
+///   except for the range within about 1e-28 second of the reference date.
+/// 0x3ef: encodes all dates for a few million years beyond distantPast and
+///   distantFuture, except within about 1e-25 second of the reference date.
+const int TAGGED_DATE_EXPONENT_BIAS = 0x3ef;
+
+struct DoubleBits {
+  uint64_t fraction : 52; // unsigned
+  uint64_t exponent : 11; // signed
+  uint64_t sign : 1;
+};
+
+struct TaggedDoubleBits {
+  uint64_t fraction : 52; // unsigned
+  uint64_t exponent : 7;  // signed
+  uint64_t sign : 1;
+  uint64_t unused : 4; // placeholder for pointer tag bits
+};
+
+static uint64_t decodeExponent(uint64_t exp) {
+  // Tagged exponent field is 7-bit signed. Sign-extend the value to 64 bits
+  // before performing arithmetic.
+  return llvm::SignExtend64<7>(exp) + TAGGED_DATE_EXPONENT_BIAS;
+}
+
+static double decodeTaggedTimeInterval(uint64_t encodedTimeInterval) {
+  if (encodedTimeInterval == 0)
+    return 0.0;
+  if (encodedTimeInterval == std::numeric_limits<uint64_t>::max())
+    return (uint64_t)-0.0;
+
+  TaggedDoubleBits encodedBits =
+      llvm::bit_cast<TaggedDoubleBits>(encodedTimeInterval);
+  assert(encodedBits.unused == 0);
+
+  // Sign and fraction are represented exactly.
+  // Exponent is encoded.
+  DoubleBits decodedBits;
+  decodedBits.sign = encodedBits.sign;
+  decodedBits.fraction = encodedBits.fraction;
+  decodedBits.exponent = decodeExponent(encodedBits.exponent);
+
+  return llvm::bit_cast<double>(decodedBits);
+}
+
+bool lldb_private::formatters::NSDateSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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();
+
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  uint64_t date_value_bits = 0;
+  double date_value = 0.0;
+
+  ConstString class_name = descriptor->GetClassName();
+
+  static const ConstString g_NSDate("NSDate");
+  static const ConstString g___NSDate("__NSDate");
+  static const ConstString g___NSTaggedDate("__NSTaggedDate");
+  static const ConstString g_NSCalendarDate("NSCalendarDate");
+
+  if (class_name.IsEmpty())
+    return false;
+
+  uint64_t info_bits = 0, value_bits = 0;
+  if ((class_name == g_NSDate) || (class_name == g___NSDate) ||
+      (class_name == g___NSTaggedDate)) {
+    if (descriptor->GetTaggedPointerInfo(&info_bits, &value_bits)) {
+      date_value_bits = ((value_bits << 8) | (info_bits << 4));
+      memcpy(&date_value, &date_value_bits, sizeof(date_value_bits));
+    } else {
+      llvm::Triple triple(
+          process_sp->GetTarget().GetArchitecture().GetTriple());
+      uint32_t delta =
+          (triple.isWatchOS() && triple.isWatchABI()) ? 8 : ptr_size;
+      Status error;
+      date_value_bits = process_sp->ReadUnsignedIntegerFromMemory(
+          valobj_addr + delta, 8, 0, error);
+      memcpy(&date_value, &date_value_bits, sizeof(date_value_bits));
+      if (error.Fail())
+        return false;
+    }
+  } else if (class_name == g_NSCalendarDate) {
+    Status error;
+    date_value_bits = process_sp->ReadUnsignedIntegerFromMemory(
+        valobj_addr + 2 * ptr_size, 8, 0, error);
+    memcpy(&date_value, &date_value_bits, sizeof(date_value_bits));
+    if (error.Fail())
+      return false;
+  } else
+    return false;
+
+  if (date_value == -63114076800) {
+    stream.Printf("0001-12-30 00:00:00 +0000");
+    return true;
+  }
+
+  // Accomodate for the __NSTaggedDate format introduced in Foundation 1600.
+  if (class_name == g___NSTaggedDate) {
+    auto *runtime = llvm::dyn_cast_or_null<AppleObjCRuntime>(
+        ObjCLanguageRuntime::Get(*process_sp));
+    if (runtime && runtime->GetFoundationVersion() >= 1600)
+      date_value = decodeTaggedTimeInterval(value_bits << 4);
+  }
+
+  // this snippet of code assumes that time_t == seconds since Jan-1-1970 this
+  // is generally true and POSIXly happy, but might break if a library vendor
+  // decides to get creative
+  time_t epoch = GetOSXEpoch();
+  epoch = epoch + (time_t)date_value;
+  tm *tm_date = gmtime(&epoch);
+  if (!tm_date)
+    return false;
+  std::string buffer(1024, 0);
+  if (strftime(&buffer[0], 1023, "%Z", tm_date) == 0)
+    return false;
+  stream.Printf("%04d-%02d-%02d %02d:%02d:%02d %s", tm_date->tm_year + 1900,
+                tm_date->tm_mon + 1, tm_date->tm_mday, tm_date->tm_hour,
+                tm_date->tm_min, tm_date->tm_sec, buffer.c_str());
+  return true;
+}
+
+bool lldb_private::formatters::ObjCClassSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process_sp);
+
+  if (!runtime)
+    return false;
+
+  ObjCLanguageRuntime::ClassDescriptorSP descriptor(
+      runtime->GetClassDescriptorFromISA(valobj.GetValueAsUnsigned(0)));
+
+  if (!descriptor || !descriptor->IsValid())
+    return false;
+
+  ConstString class_name = descriptor->GetClassName();
+
+  if (class_name.IsEmpty())
+    return false;
+
+  if (ConstString cs =
+          Mangled(class_name).GetDemangledName(lldb::eLanguageTypeUnknown))
+    class_name = cs;
+
+  stream.Printf("%s", class_name.AsCString("<unknown class>"));
+  return true;
+}
+
+class ObjCClassSyntheticChildrenFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  ObjCClassSyntheticChildrenFrontEnd(lldb::ValueObjectSP valobj_sp)
+      : SyntheticChildrenFrontEnd(*valobj_sp) {}
+
+  ~ObjCClassSyntheticChildrenFrontEnd() override = default;
+
+  size_t CalculateNumChildren() override { return 0; }
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
+    return lldb::ValueObjectSP();
+  }
+
+  bool Update() override { return false; }
+
+  bool MightHaveChildren() override { return false; }
+
+  size_t GetIndexOfChildWithName(ConstString name) override {
+    return UINT32_MAX;
+  }
+};
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::ObjCClassSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return new ObjCClassSyntheticChildrenFrontEnd(valobj_sp);
+}
+
+template <bool needs_at>
+bool lldb_private::formatters::NSDataSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  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;
+
+  bool is_64bit = (process_sp->GetAddressByteSize() == 8);
+  lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
+
+  if (!valobj_addr)
+    return false;
+
+  uint64_t value = 0;
+
+  llvm::StringRef class_name = descriptor->GetClassName().GetCString();
+
+  if (class_name.empty())
+    return false;
+
+  bool isNSConcreteData = class_name == "NSConcreteData";
+  bool isNSConcreteMutableData = class_name == "NSConcreteMutableData";
+  bool isNSCFData = class_name == "__NSCFData";
+  if (isNSConcreteData || isNSConcreteMutableData || isNSCFData) {
+    uint32_t offset;
+    if (isNSConcreteData)
+      offset = is_64bit ? 8 : 4;
+    else
+      offset = is_64bit ? 16 : 8;
+
+    Status error;
+    value = process_sp->ReadUnsignedIntegerFromMemory(
+        valobj_addr + offset, is_64bit ? 8 : 4, 0, error);
+    if (error.Fail())
+      return false;
+  } else if (class_name == "_NSInlineData") {
+    uint32_t offset = (is_64bit ? 8 : 4);
+    Status error;
+    value = process_sp->ReadUnsignedIntegerFromMemory(valobj_addr + offset, 2,
+                                                      0, error);
+    if (error.Fail())
+      return false;
+  } else if (class_name == "_NSZeroData") {
+    value = 0;
+  } else
+    return false;
+
+  stream.Printf("%s%" PRIu64 " byte%s%s", (needs_at ? "@\"" : ""), value,
+                (value != 1 ? "s" : ""), (needs_at ? "\"" : ""));
+
+  return true;
+}
+
+bool lldb_private::formatters::ObjCBOOLSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  const uint32_t type_info = valobj.GetCompilerType().GetTypeInfo();
+
+  ValueObjectSP real_guy_sp = valobj.GetSP();
+
+  if (type_info & eTypeIsPointer) {
+    Status err;
+    real_guy_sp = valobj.Dereference(err);
+    if (err.Fail() || !real_guy_sp)
+      return false;
+  } else if (type_info & eTypeIsReference) {
+    real_guy_sp = valobj.GetChildAtIndex(0, true);
+    if (!real_guy_sp)
+      return false;
+  }
+  uint8_t value = (real_guy_sp->GetValueAsUnsigned(0) & 0xFF);
+  switch (value) {
+  case 0:
+    stream.Printf("NO");
+    break;
+  case 1:
+    stream.Printf("YES");
+    break;
+  default:
+    stream.Printf("%u", value);
+    break;
+  }
+  return true;
+}
+
+bool lldb_private::formatters::ObjCBooleanSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  lldb::addr_t valobj_ptr_value =
+      valobj.GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
+  if (valobj_ptr_value == LLDB_INVALID_ADDRESS)
+    return false;
+
+  ProcessSP process_sp(valobj.GetProcessSP());
+  if (!process_sp)
+    return false;
+
+  if (AppleObjCRuntime *objc_runtime = llvm::dyn_cast_or_null<AppleObjCRuntime>(
+          ObjCLanguageRuntime::Get(*process_sp))) {
+    lldb::addr_t cf_true = LLDB_INVALID_ADDRESS,
+                 cf_false = LLDB_INVALID_ADDRESS;
+    objc_runtime->GetValuesForGlobalCFBooleans(cf_true, cf_false);
+    if (valobj_ptr_value == cf_true) {
+      stream.PutCString("YES");
+      return true;
+    }
+    if (valobj_ptr_value == cf_false) {
+      stream.PutCString("NO");
+      return true;
+    }
+  }
+
+  return false;
+}
+
+template <bool is_sel_ptr>
+bool lldb_private::formatters::ObjCSELSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  lldb::ValueObjectSP valobj_sp;
+
+  CompilerType charstar(valobj.GetCompilerType()
+                            .GetBasicTypeFromAST(eBasicTypeChar)
+                            .GetPointerType());
+
+  if (!charstar)
+    return false;
+
+  ExecutionContext exe_ctx(valobj.GetExecutionContextRef());
+
+  if (is_sel_ptr) {
+    lldb::addr_t data_address = valobj.GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
+    if (data_address == LLDB_INVALID_ADDRESS)
+      return false;
+    valobj_sp = ValueObject::CreateValueObjectFromAddress("text", data_address,
+                                                          exe_ctx, charstar);
+  } else {
+    DataExtractor data;
+    Status error;
+    valobj.GetData(data, error);
+    if (error.Fail())
+      return false;
+    valobj_sp =
+        ValueObject::CreateValueObjectFromData("text", data, exe_ctx, charstar);
+  }
+
+  if (!valobj_sp)
+    return false;
+
+  stream.Printf("%s", valobj_sp->GetSummaryAsCString());
+  return true;
+}
+
+// POSIX has an epoch on Jan-1-1970, but Cocoa prefers Jan-1-2001
+// this call gives the POSIX equivalent of the Cocoa epoch
+time_t lldb_private::formatters::GetOSXEpoch() {
+  static time_t epoch = 0;
+  if (!epoch) {
+#ifndef _WIN32
+    tzset();
+    tm tm_epoch;
+    tm_epoch.tm_sec = 0;
+    tm_epoch.tm_hour = 0;
+    tm_epoch.tm_min = 0;
+    tm_epoch.tm_mon = 0;
+    tm_epoch.tm_mday = 1;
+    tm_epoch.tm_year = 2001 - 1900;
+    tm_epoch.tm_isdst = -1;
+    tm_epoch.tm_gmtoff = 0;
+    tm_epoch.tm_zone = nullptr;
+    epoch = timegm(&tm_epoch);
+#endif
+  }
+  return epoch;
+}
+
+template bool lldb_private::formatters::NSDataSummaryProvider<true>(
+    ValueObject &, Stream &, const TypeSummaryOptions &);
+
+template bool lldb_private::formatters::NSDataSummaryProvider<false>(
+    ValueObject &, Stream &, const TypeSummaryOptions &);
+
+template bool lldb_private::formatters::ObjCSELSummaryProvider<true>(
+    ValueObject &, Stream &, const TypeSummaryOptions &);
+
+template bool lldb_private::formatters::ObjCSELSummaryProvider<false>(
+    ValueObject &, Stream &, const TypeSummaryOptions &);