Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/lldb/source/Plugins/Language/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_subdirectory(CPlusPlus)
+add_subdirectory(Go)
+add_subdirectory(Java)
+add_subdirectory(ObjC)
+add_subdirectory(ObjCPlusPlus)
+add_subdirectory(OCaml)

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp

@@ -0,0 +1,211 @@
+//===-- BlockPointer.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "BlockPointer.h"
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Symbol/ClangASTImporter.h"
+#include "lldb/Symbol/CompilerType.h"
+#include "lldb/Symbol/TypeSystem.h"
+#include "lldb/Target/Target.h"
+
+#include "lldb/Utility/LLDBAssert.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+namespace lldb_private {
+namespace formatters {
+
+class BlockPointerSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  BlockPointerSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+      : SyntheticChildrenFrontEnd(*valobj_sp), m_block_struct_type() {
+    CompilerType block_pointer_type(m_backend.GetCompilerType());
+    CompilerType function_pointer_type;
+    block_pointer_type.IsBlockPointerType(&function_pointer_type);
+
+    TargetSP target_sp(m_backend.GetTargetSP());
+
+    if (!target_sp) {
+      return;
+    }
+
+    Status err;
+    TypeSystem *type_system = target_sp->GetScratchTypeSystemForLanguage(
+        &err, lldb::eLanguageTypeC_plus_plus);
+
+    if (!err.Success() || !type_system) {
+      return;
+    }
+
+    ClangASTContext *clang_ast_context =
+        llvm::dyn_cast<ClangASTContext>(type_system);
+
+    if (!clang_ast_context) {
+      return;
+    }
+
+    ClangASTImporterSP clang_ast_importer = target_sp->GetClangASTImporter();
+
+    if (!clang_ast_importer) {
+      return;
+    }
+
+    const char *const isa_name("__isa");
+    const CompilerType isa_type =
+        clang_ast_context->GetBasicType(lldb::eBasicTypeObjCClass);
+    const char *const flags_name("__flags");
+    const CompilerType flags_type =
+        clang_ast_context->GetBasicType(lldb::eBasicTypeInt);
+    const char *const reserved_name("__reserved");
+    const CompilerType reserved_type =
+        clang_ast_context->GetBasicType(lldb::eBasicTypeInt);
+    const char *const FuncPtr_name("__FuncPtr");
+    const CompilerType FuncPtr_type =
+        clang_ast_importer->CopyType(*clang_ast_context, function_pointer_type);
+
+    m_block_struct_type = clang_ast_context->CreateStructForIdentifier(
+        ConstString(), {{isa_name, isa_type},
+                        {flags_name, flags_type},
+                        {reserved_name, reserved_type},
+                        {FuncPtr_name, FuncPtr_type}});
+  }
+
+  ~BlockPointerSyntheticFrontEnd() override = default;
+
+  size_t CalculateNumChildren() override {
+    const bool omit_empty_base_classes = false;
+    return m_block_struct_type.GetNumChildren(omit_empty_base_classes);
+  }
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
+    if (!m_block_struct_type.IsValid()) {
+      return lldb::ValueObjectSP();
+    }
+
+    if (idx >= CalculateNumChildren()) {
+      return lldb::ValueObjectSP();
+    }
+
+    const bool thread_and_frame_only_if_stopped = true;
+    ExecutionContext exe_ctx = m_backend.GetExecutionContextRef().Lock(
+        thread_and_frame_only_if_stopped);
+    const bool transparent_pointers = false;
+    const bool omit_empty_base_classes = false;
+    const bool ignore_array_bounds = false;
+    ValueObject *value_object = nullptr;
+
+    std::string child_name;
+    uint32_t child_byte_size = 0;
+    int32_t child_byte_offset = 0;
+    uint32_t child_bitfield_bit_size = 0;
+    uint32_t child_bitfield_bit_offset = 0;
+    bool child_is_base_class = false;
+    bool child_is_deref_of_parent = false;
+    uint64_t language_flags = 0;
+
+    const CompilerType child_type =
+        m_block_struct_type.GetChildCompilerTypeAtIndex(
+            &exe_ctx, idx, transparent_pointers, omit_empty_base_classes,
+            ignore_array_bounds, child_name, child_byte_size, child_byte_offset,
+            child_bitfield_bit_size, child_bitfield_bit_offset,
+            child_is_base_class, child_is_deref_of_parent, value_object,
+            language_flags);
+
+    ValueObjectSP struct_pointer_sp =
+        m_backend.Cast(m_block_struct_type.GetPointerType());
+
+    if (!struct_pointer_sp) {
+      return lldb::ValueObjectSP();
+    }
+
+    Status err;
+    ValueObjectSP struct_sp = struct_pointer_sp->Dereference(err);
+
+    if (!struct_sp || !err.Success()) {
+      return lldb::ValueObjectSP();
+    }
+
+    ValueObjectSP child_sp(struct_sp->GetSyntheticChildAtOffset(
+        child_byte_offset, child_type, true,
+        ConstString(child_name.c_str(), child_name.size())));
+
+    return child_sp;
+  }
+
+  // return true if this object is now safe to use forever without
+  // ever updating again; the typical (and tested) answer here is
+  // 'false'
+  bool Update() override { return false; }
+
+  // maybe return false if the block pointer is, say, null
+  bool MightHaveChildren() override { return true; }
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override {
+    if (!m_block_struct_type.IsValid())
+      return UINT32_MAX;
+
+    const bool omit_empty_base_classes = false;
+    return m_block_struct_type.GetIndexOfChildWithName(name.AsCString(),
+                                                       omit_empty_base_classes);
+  }
+
+private:
+  CompilerType m_block_struct_type;
+};
+
+} // namespace formatters
+} // namespace lldb_private
+
+bool lldb_private::formatters::BlockPointerSummaryProvider(
+    ValueObject &valobj, Stream &s, const TypeSummaryOptions &) {
+  lldb_private::SyntheticChildrenFrontEnd *synthetic_children =
+      BlockPointerSyntheticFrontEndCreator(nullptr, valobj.GetSP());
+  if (!synthetic_children) {
+    return false;
+  }
+
+  synthetic_children->Update();
+
+  static const ConstString s_FuncPtr_name("__FuncPtr");
+
+  lldb::ValueObjectSP child_sp = synthetic_children->GetChildAtIndex(
+      synthetic_children->GetIndexOfChildWithName(s_FuncPtr_name));
+
+  if (!child_sp) {
+    return false;
+  }
+
+  lldb::ValueObjectSP qualified_child_representation_sp =
+      child_sp->GetQualifiedRepresentationIfAvailable(
+          lldb::eDynamicDontRunTarget, true);
+
+  const char *child_value =
+      qualified_child_representation_sp->GetValueAsCString();
+
+  s.Printf("%s", child_value);
+
+  return true;
+}
+
+lldb_private::SyntheticChildrenFrontEnd *
+lldb_private::formatters::BlockPointerSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  if (!valobj_sp)
+    return nullptr;
+  return new BlockPointerSyntheticFrontEnd(valobj_sp);
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.h

@@ -0,0 +1,26 @@
+//===-- BlockPointer.h ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_BlockPointer_h_
+#define liblldb_BlockPointer_h_
+
+#include "lldb/lldb-forward.h"
+
+namespace lldb_private {
+namespace formatters {
+bool BlockPointerSummaryProvider(ValueObject &, Stream &,
+                                 const TypeSummaryOptions &);
+
+SyntheticChildrenFrontEnd *
+BlockPointerSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                     lldb::ValueObjectSP);
+} // namespace formatters
+} // namespace lldb_private
+
+#endif // liblldb_BlockPointer_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/CMakeLists.txt

@@ -0,0 +1,29 @@
+add_lldb_library(lldbPluginCPlusPlusLanguage PLUGIN
+  BlockPointer.cpp
+  CPlusPlusLanguage.cpp
+  CPlusPlusNameParser.cpp
+  CxxStringTypes.cpp
+  LibCxx.cpp
+  LibCxxAtomic.cpp
+  LibCxxBitset.cpp
+  LibCxxInitializerList.cpp
+  LibCxxList.cpp
+  LibCxxMap.cpp
+  LibCxxQueue.cpp
+  LibCxxTuple.cpp
+  LibCxxUnorderedMap.cpp
+  LibCxxVector.cpp
+  LibStdcpp.cpp
+  LibStdcppTuple.cpp
+  LibStdcppUniquePointer.cpp
+
+  LINK_LIBS
+    lldbCore
+    lldbDataFormatters
+    lldbHost
+    lldbSymbol
+    lldbTarget
+    lldbUtility
+  LINK_COMPONENTS
+    Support
+)

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h

@@ -0,0 +1,138 @@
+//===-- CPlusPlusLanguage.h -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_CPlusPlusLanguage_h_
+#define liblldb_CPlusPlusLanguage_h_
+
+// C Includes
+// C++ Includes
+#include <set>
+#include <vector>
+
+// Other libraries and framework includes
+#include "llvm/ADT/StringRef.h"
+
+// Project includes
+#include "lldb/Target/Language.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/lldb-private.h"
+
+namespace lldb_private {
+
+class CPlusPlusLanguage : public Language {
+public:
+  class MethodName {
+  public:
+    MethodName()
+        : m_full(), m_basename(), m_context(), m_arguments(), m_qualifiers(),
+          m_parsed(false), m_parse_error(false) {}
+
+    MethodName(const ConstString &s)
+        : m_full(s), m_basename(), m_context(), m_arguments(), m_qualifiers(),
+          m_parsed(false), m_parse_error(false) {}
+
+    void Clear();
+
+    bool IsValid() {
+      if (!m_parsed)
+        Parse();
+      if (m_parse_error)
+        return false;
+      return (bool)m_full;
+    }
+
+    const ConstString &GetFullName() const { return m_full; }
+
+    std::string GetScopeQualifiedName();
+
+    llvm::StringRef GetBasename();
+
+    llvm::StringRef GetContext();
+
+    llvm::StringRef GetArguments();
+
+    llvm::StringRef GetQualifiers();
+
+  protected:
+    void Parse();
+    bool TrySimplifiedParse();
+
+    ConstString m_full; // Full name:
+                        // "lldb::SBTarget::GetBreakpointAtIndex(unsigned int)
+                        // const"
+    llvm::StringRef m_basename;   // Basename:     "GetBreakpointAtIndex"
+    llvm::StringRef m_context;    // Decl context: "lldb::SBTarget"
+    llvm::StringRef m_arguments;  // Arguments:    "(unsigned int)"
+    llvm::StringRef m_qualifiers; // Qualifiers:   "const"
+    bool m_parsed;
+    bool m_parse_error;
+  };
+
+  CPlusPlusLanguage() = default;
+
+  ~CPlusPlusLanguage() override = default;
+
+  lldb::LanguageType GetLanguageType() const override {
+    return lldb::eLanguageTypeC_plus_plus;
+  }
+
+  std::unique_ptr<TypeScavenger> GetTypeScavenger() override;
+  lldb::TypeCategoryImplSP GetFormatters() override;
+
+  HardcodedFormatters::HardcodedSummaryFinder GetHardcodedSummaries() override;
+
+  HardcodedFormatters::HardcodedSyntheticFinder
+  GetHardcodedSynthetics() override;
+
+  //------------------------------------------------------------------
+  // Static Functions
+  //------------------------------------------------------------------
+  static void Initialize();
+
+  static void Terminate();
+
+  static lldb_private::Language *CreateInstance(lldb::LanguageType language);
+
+  static lldb_private::ConstString GetPluginNameStatic();
+
+  static bool IsCPPMangledName(const char *name);
+
+  // Extract C++ context and identifier from a string using heuristic matching
+  // (as opposed to
+  // CPlusPlusLanguage::MethodName which has to have a fully qualified C++ name
+  // with parens and arguments.
+  // If the name is a lone C identifier (e.g. C) or a qualified C identifier
+  // (e.g. A::B::C) it will return true,
+  // and identifier will be the identifier (C and C respectively) and the
+  // context will be "" and "A::B" respectively.
+  // If the name fails the heuristic matching for a qualified or unqualified
+  // C/C++ identifier, then it will return false
+  // and identifier and context will be unchanged.
+
+  static bool ExtractContextAndIdentifier(const char *name,
+                                          llvm::StringRef &context,
+                                          llvm::StringRef &identifier);
+
+  // Given a mangled function name, calculates some alternative manglings since
+  // the compiler mangling may not line up with the symbol we are expecting
+  static uint32_t
+  FindAlternateFunctionManglings(const ConstString mangled,
+                                 std::set<ConstString> &candidates);
+
+  //------------------------------------------------------------------
+  // PluginInterface protocol
+  //------------------------------------------------------------------
+  ConstString GetPluginName() override;
+
+  uint32_t GetPluginVersion() override;
+};
+
+} // namespace lldb_private
+
+#endif // liblldb_CPlusPlusLanguage_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusNameParser.h

@@ -0,0 +1,182 @@
+//===-- CPlusPlusNameParser.h -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_CPlusPlusNameParser_h_
+#define liblldb_CPlusPlusNameParser_h_
+
+// C Includes
+// C++ Includes
+
+// Other libraries and framework includes
+#include "clang/Lex/Lexer.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+
+// Project includes
+#include "lldb/Utility/ConstString.h"
+#include "lldb/lldb-private.h"
+
+namespace lldb_private {
+
+// Helps to validate and obtain various parts of C++ definitions.
+class CPlusPlusNameParser {
+public:
+  CPlusPlusNameParser(llvm::StringRef text) : m_text(text) { ExtractTokens(); }
+
+  struct ParsedName {
+    llvm::StringRef basename;
+    llvm::StringRef context;
+  };
+
+  struct ParsedFunction {
+    ParsedName name;
+    llvm::StringRef arguments;
+    llvm::StringRef qualifiers;
+  };
+
+  // Treats given text as a function definition and parses it.
+  // Function definition might or might not have a return type and this should
+  // change parsing result.
+  // Examples:
+  //    main(int, chat const*)
+  //    T fun(int, bool)
+  //    std::vector<int>::push_back(int)
+  //    int& map<int, pair<short, int>>::operator[](short) const
+  //    int (*get_function(const chat *))()
+  llvm::Optional<ParsedFunction> ParseAsFunctionDefinition();
+
+  // Treats given text as a potentially nested name of C++ entity (function,
+  // class, field) and parses it.
+  // Examples:
+  //    main
+  //    fun
+  //    std::vector<int>::push_back
+  //    map<int, pair<short, int>>::operator[]
+  //    func<C>(int, C&)::nested_class::method
+  llvm::Optional<ParsedName> ParseAsFullName();
+
+private:
+  // A C++ definition to parse.
+  llvm::StringRef m_text;
+  // Tokens extracted from m_text.
+  llvm::SmallVector<clang::Token, 30> m_tokens;
+  // Index of the next token to look at from m_tokens.
+  size_t m_next_token_index = 0;
+
+  // Range of tokens saved in m_next_token_index.
+  struct Range {
+    size_t begin_index = 0;
+    size_t end_index = 0;
+
+    Range() {}
+    Range(size_t begin, size_t end) : begin_index(begin), end_index(end) {
+      assert(end >= begin);
+    }
+
+    size_t size() const { return end_index - begin_index; }
+
+    bool empty() const { return size() == 0; }
+  };
+
+  struct ParsedNameRanges {
+    Range basename_range;
+    Range context_range;
+  };
+
+  // Bookmark automatically restores parsing position (m_next_token_index)
+  // when destructed unless it's manually removed with Remove().
+  class Bookmark {
+  public:
+    Bookmark(size_t &position)
+        : m_position(position), m_position_value(position) {}
+    Bookmark(const Bookmark &) = delete;
+    Bookmark(Bookmark &&b)
+        : m_position(b.m_position), m_position_value(b.m_position_value),
+          m_restore(b.m_restore) {
+      b.Remove();
+    }
+    Bookmark &operator=(Bookmark &&) = delete;
+    Bookmark &operator=(const Bookmark &) = delete;
+
+    void Remove() { m_restore = false; }
+    size_t GetSavedPosition() { return m_position_value; }
+    ~Bookmark() {
+      if (m_restore) {
+        m_position = m_position_value;
+      }
+    }
+
+  private:
+    size_t &m_position;
+    size_t m_position_value;
+    bool m_restore = true;
+  };
+
+  bool HasMoreTokens();
+  void Advance();
+  void TakeBack();
+  bool ConsumeToken(clang::tok::TokenKind kind);
+  template <typename... Ts> bool ConsumeToken(Ts... kinds);
+  Bookmark SetBookmark();
+  size_t GetCurrentPosition();
+  clang::Token &Peek();
+  bool ConsumeBrackets(clang::tok::TokenKind left, clang::tok::TokenKind right);
+
+  llvm::Optional<ParsedFunction> ParseFunctionImpl(bool expect_return_type);
+
+  // Parses functions returning function pointers 'string (*f(int x))(float y)'
+  llvm::Optional<ParsedFunction> ParseFuncPtr(bool expect_return_type);
+
+  // Consumes function arguments enclosed within '(' ... ')'
+  bool ConsumeArguments();
+
+  // Consumes template arguments enclosed within '<' ... '>'
+  bool ConsumeTemplateArgs();
+
+  // Consumes '(anonymous namespace)'
+  bool ConsumeAnonymousNamespace();
+
+  // Consumes '{lambda ...}'
+  bool ConsumeLambda();
+
+  // Consumes operator declaration like 'operator *' or 'operator delete []'
+  bool ConsumeOperator();
+
+  // Skips 'const' and 'volatile'
+  void SkipTypeQualifiers();
+
+  // Skips 'const', 'volatile', '&', '&&' in the end of the function.
+  void SkipFunctionQualifiers();
+
+  // Consumes built-in types like 'int' or 'unsigned long long int'
+  bool ConsumeBuiltinType();
+
+  // Consumes types defined via decltype keyword.
+  bool ConsumeDecltype();
+
+  // Skips 'const' and 'volatile'
+  void SkipPtrsAndRefs();
+
+  // Consumes things like 'const * const &'
+  bool ConsumePtrsAndRefs();
+
+  // Consumes full type name like 'Namespace::Class<int>::Method()::InnerClass'
+  bool ConsumeTypename();
+
+  llvm::Optional<ParsedNameRanges> ParseFullNameImpl();
+  llvm::StringRef GetTextForRange(const Range &range);
+
+  // Populate m_tokens by calling clang lexer on m_text.
+  void ExtractTokens();
+};
+
+} // namespace lldb_private
+
+#endif // liblldb_CPlusPlusNameParser_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/CxxStringTypes.cpp

@@ -0,0 +1,223 @@
+//===-- CxxStringTypes.cpp --------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CxxStringTypes.h"
+
+#include "llvm/Support/ConvertUTF.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/ProcessStructReader.h"
+#include "lldb/Target/SectionLoadList.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Utility/DataBufferHeap.h"
+#include "lldb/Utility/Endian.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/Utility/Stream.h"
+
+#include <algorithm>
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+bool lldb_private::formatters::Char16StringSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  lldb::addr_t valobj_addr = GetArrayAddressOrPointerValue(valobj);
+  if (valobj_addr == 0 || valobj_addr == LLDB_INVALID_ADDRESS)
+    return false;
+
+  StringPrinter::ReadStringAndDumpToStreamOptions options(valobj);
+  options.SetLocation(valobj_addr);
+  options.SetProcessSP(process_sp);
+  options.SetStream(&stream);
+  options.SetPrefixToken("u");
+
+  if (!StringPrinter::ReadStringAndDumpToStream<
+          StringPrinter::StringElementType::UTF16>(options)) {
+    stream.Printf("Summary Unavailable");
+    return true;
+  }
+
+  return true;
+}
+
+bool lldb_private::formatters::Char32StringSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  lldb::addr_t valobj_addr = GetArrayAddressOrPointerValue(valobj);
+  if (valobj_addr == 0 || valobj_addr == LLDB_INVALID_ADDRESS)
+    return false;
+
+  StringPrinter::ReadStringAndDumpToStreamOptions options(valobj);
+  options.SetLocation(valobj_addr);
+  options.SetProcessSP(process_sp);
+  options.SetStream(&stream);
+  options.SetPrefixToken("U");
+
+  if (!StringPrinter::ReadStringAndDumpToStream<
+          StringPrinter::StringElementType::UTF32>(options)) {
+    stream.Printf("Summary Unavailable");
+    return true;
+  }
+
+  return true;
+}
+
+bool lldb_private::formatters::WCharStringSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  ProcessSP process_sp = valobj.GetProcessSP();
+  if (!process_sp)
+    return false;
+
+  lldb::addr_t valobj_addr = GetArrayAddressOrPointerValue(valobj);
+  if (valobj_addr == 0 || valobj_addr == LLDB_INVALID_ADDRESS)
+    return false;
+
+  // Get a wchar_t basic type from the current type system
+  CompilerType wchar_compiler_type =
+      valobj.GetCompilerType().GetBasicTypeFromAST(lldb::eBasicTypeWChar);
+
+  if (!wchar_compiler_type)
+    return false;
+
+  const uint32_t wchar_size = wchar_compiler_type.GetBitSize(
+      nullptr); // Safe to pass NULL for exe_scope here
+
+  StringPrinter::ReadStringAndDumpToStreamOptions options(valobj);
+  options.SetLocation(valobj_addr);
+  options.SetProcessSP(process_sp);
+  options.SetStream(&stream);
+  options.SetPrefixToken("L");
+
+  switch (wchar_size) {
+  case 8:
+    return StringPrinter::ReadStringAndDumpToStream<
+        StringPrinter::StringElementType::UTF8>(options);
+  case 16:
+    return StringPrinter::ReadStringAndDumpToStream<
+        StringPrinter::StringElementType::UTF16>(options);
+  case 32:
+    return StringPrinter::ReadStringAndDumpToStream<
+        StringPrinter::StringElementType::UTF32>(options);
+  default:
+    stream.Printf("size for wchar_t is not valid");
+    return true;
+  }
+  return true;
+}
+
+bool lldb_private::formatters::Char16SummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  DataExtractor data;
+  Status error;
+  valobj.GetData(data, error);
+
+  if (error.Fail())
+    return false;
+
+  std::string value;
+  valobj.GetValueAsCString(lldb::eFormatUnicode16, value);
+  if (!value.empty())
+    stream.Printf("%s ", value.c_str());
+
+  StringPrinter::ReadBufferAndDumpToStreamOptions options(valobj);
+  options.SetData(data);
+  options.SetStream(&stream);
+  options.SetPrefixToken("u");
+  options.SetQuote('\'');
+  options.SetSourceSize(1);
+  options.SetBinaryZeroIsTerminator(false);
+
+  return StringPrinter::ReadBufferAndDumpToStream<
+      StringPrinter::StringElementType::UTF16>(options);
+}
+
+bool lldb_private::formatters::Char32SummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  DataExtractor data;
+  Status error;
+  valobj.GetData(data, error);
+
+  if (error.Fail())
+    return false;
+
+  std::string value;
+  valobj.GetValueAsCString(lldb::eFormatUnicode32, value);
+  if (!value.empty())
+    stream.Printf("%s ", value.c_str());
+
+  StringPrinter::ReadBufferAndDumpToStreamOptions options(valobj);
+  options.SetData(data);
+  options.SetStream(&stream);
+  options.SetPrefixToken("U");
+  options.SetQuote('\'');
+  options.SetSourceSize(1);
+  options.SetBinaryZeroIsTerminator(false);
+
+  return StringPrinter::ReadBufferAndDumpToStream<
+      StringPrinter::StringElementType::UTF32>(options);
+}
+
+bool lldb_private::formatters::WCharSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &) {
+  DataExtractor data;
+  Status error;
+  valobj.GetData(data, error);
+
+  if (error.Fail())
+    return false;
+
+  // Get a wchar_t basic type from the current type system
+  CompilerType wchar_compiler_type =
+      valobj.GetCompilerType().GetBasicTypeFromAST(lldb::eBasicTypeWChar);
+
+  if (!wchar_compiler_type)
+    return false;
+
+  const uint32_t wchar_size = wchar_compiler_type.GetBitSize(
+      nullptr); // Safe to pass NULL for exe_scope here
+
+  StringPrinter::ReadBufferAndDumpToStreamOptions options(valobj);
+  options.SetData(data);
+  options.SetStream(&stream);
+  options.SetPrefixToken("L");
+  options.SetQuote('\'');
+  options.SetSourceSize(1);
+  options.SetBinaryZeroIsTerminator(false);
+
+  switch (wchar_size) {
+  case 8:
+    return StringPrinter::ReadBufferAndDumpToStream<
+        StringPrinter::StringElementType::UTF8>(options);
+  case 16:
+    return StringPrinter::ReadBufferAndDumpToStream<
+        StringPrinter::StringElementType::UTF16>(options);
+  case 32:
+    return StringPrinter::ReadBufferAndDumpToStream<
+        StringPrinter::StringElementType::UTF32>(options);
+  default:
+    stream.Printf("size for wchar_t is not valid");
+    return true;
+  }
+  return true;
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/CxxStringTypes.h

@@ -0,0 +1,44 @@
+//===-- CxxStringTypes.h ----------------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_CxxStringTypes_h_
+#define liblldb_CxxStringTypes_h_
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/TypeSummary.h"
+#include "lldb/Utility/Stream.h"
+
+namespace lldb_private {
+namespace formatters {
+bool Char16StringSummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions &options); // char16_t* and unichar*
+
+bool Char32StringSummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions &options); // char32_t*
+
+bool WCharStringSummaryProvider(ValueObject &valobj, Stream &stream,
+                                const TypeSummaryOptions &options); // wchar_t*
+
+bool Char16SummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions &options); // char16_t and unichar
+
+bool Char32SummaryProvider(ValueObject &valobj, Stream &stream,
+                           const TypeSummaryOptions &options); // char32_t
+
+bool WCharSummaryProvider(ValueObject &valobj, Stream &stream,
+                          const TypeSummaryOptions &options); // wchar_t
+
+} // namespace formatters
+} // namespace lldb_private
+
+#endif // liblldb_CxxStringTypes_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxx.h

@@ -0,0 +1,139 @@
+//===-- LibCxx.h ---------------------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_LibCxx_h_
+#define liblldb_LibCxx_h_
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/TypeSummary.h"
+#include "lldb/DataFormatters/TypeSynthetic.h"
+#include "lldb/Utility/Stream.h"
+
+namespace lldb_private {
+namespace formatters {
+
+bool LibcxxStringSummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions &options); // libc++ std::string
+
+bool LibcxxWStringSummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions &options); // libc++ std::wstring
+
+bool LibcxxSmartPointerSummaryProvider(
+    ValueObject &valobj, Stream &stream,
+    const TypeSummaryOptions
+        &options); // libc++ std::shared_ptr<> and std::weak_ptr<>
+
+SyntheticChildrenFrontEnd *
+LibcxxVectorBoolSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                         lldb::ValueObjectSP);
+
+bool LibcxxContainerSummaryProvider(ValueObject &valobj, Stream &stream,
+                                    const TypeSummaryOptions &options);
+
+class LibCxxMapIteratorSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  LibCxxMapIteratorSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+
+  ~LibCxxMapIteratorSyntheticFrontEnd() override;
+
+private:
+  ValueObject *m_pair_ptr;
+  lldb::ValueObjectSP m_pair_sp;
+};
+
+SyntheticChildrenFrontEnd *
+LibCxxMapIteratorSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                          lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibCxxVectorIteratorSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                             lldb::ValueObjectSP);
+
+class LibcxxSharedPtrSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  LibcxxSharedPtrSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+
+  ~LibcxxSharedPtrSyntheticFrontEnd() override;
+
+private:
+  ValueObject *m_cntrl;
+  lldb::ValueObjectSP m_count_sp;
+  lldb::ValueObjectSP m_weak_count_sp;
+  uint8_t m_ptr_size;
+  lldb::ByteOrder m_byte_order;
+};
+
+SyntheticChildrenFrontEnd *
+LibcxxBitsetSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                     lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxSharedPtrSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                        lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxStdVectorSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                        lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxStdListSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                      lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxStdForwardListSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                             lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxStdMapSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                     lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxStdUnorderedMapSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                              lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *
+LibcxxInitializerListSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                              lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *LibcxxFunctionFrontEndCreator(CXXSyntheticChildren *,
+                                                         lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *LibcxxQueueFrontEndCreator(CXXSyntheticChildren *,
+                                                      lldb::ValueObjectSP);
+
+SyntheticChildrenFrontEnd *LibcxxTupleFrontEndCreator(CXXSyntheticChildren *,
+                                                      lldb::ValueObjectSP);
+
+} // namespace formatters
+} // namespace lldb_private
+
+#endif // liblldb_LibCxx_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp

@@ -0,0 +1,105 @@
+//===-- LibCxxAtomic.cpp ------------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibCxxAtomic.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+bool lldb_private::formatters::LibCxxAtomicSummaryProvider(
+    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
+  static ConstString g___a_("__a_");
+
+  if (ValueObjectSP child = valobj.GetChildMemberWithName(g___a_, true)) {
+    std::string summary;
+    if (child->GetSummaryAsCString(summary, options) && summary.size() > 0) {
+      stream.Printf("%s", summary.c_str());
+      return true;
+    }
+  }
+
+  return false;
+}
+
+namespace lldb_private {
+namespace formatters {
+class LibcxxStdAtomicSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~LibcxxStdAtomicSyntheticFrontEnd() override = default;
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+
+  lldb::ValueObjectSP GetSyntheticValue() override;
+
+private:
+  ValueObject *m_real_child;
+};
+} // namespace formatters
+} // namespace lldb_private
+
+lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
+    LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_real_child(nullptr) {}
+
+bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() {
+  static ConstString g___a_("__a_");
+
+  m_real_child = m_backend.GetChildMemberWithName(g___a_, true).get();
+
+  return false;
+}
+
+bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
+    MightHaveChildren() {
+  return true;
+}
+
+size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
+    CalculateNumChildren() {
+  return m_real_child ? m_real_child->GetNumChildren() : 0;
+}
+
+lldb::ValueObjectSP
+lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
+    size_t idx) {
+  return m_real_child ? m_real_child->GetChildAtIndex(idx, true) : nullptr;
+}
+
+size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
+    GetIndexOfChildWithName(const ConstString &name) {
+  return m_real_child ? m_real_child->GetIndexOfChildWithName(name)
+                      : UINT32_MAX;
+}
+
+lldb::ValueObjectSP lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
+    GetSyntheticValue() {
+  if (m_real_child && m_real_child->CanProvideValue())
+    return m_real_child->GetSP();
+  return nullptr;
+}
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  if (valobj_sp)
+    return new LibcxxStdAtomicSyntheticFrontEnd(valobj_sp);
+  return nullptr;
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.h

@@ -0,0 +1,31 @@
+//===-- LibCxxAtomic.h -------------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_LibCxxAtomic_h_
+#define liblldb_LibCxxAtomic_h_
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/TypeSummary.h"
+#include "lldb/DataFormatters/TypeSynthetic.h"
+#include "lldb/Utility/Stream.h"
+
+namespace lldb_private {
+namespace formatters {
+bool LibCxxAtomicSummaryProvider(ValueObject &valobj, Stream &stream,
+                                 const TypeSummaryOptions &options);
+
+SyntheticChildrenFrontEnd *
+LibcxxAtomicSyntheticFrontEndCreator(CXXSyntheticChildren *,
+                                     lldb::ValueObjectSP);
+
+} // namespace formatters
+} // namespace lldb_private
+
+#endif // liblldb_LibCxxAtomic_h_

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxBitset.cpp

@@ -0,0 +1,107 @@
+//===-- LibCxxBitset.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibCxx.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Target/Target.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace {
+
+class BitsetFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  BitsetFrontEnd(ValueObject &valobj);
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override {
+    return formatters::ExtractIndexFromString(name.GetCString());
+  }
+
+  bool MightHaveChildren() override { return true; }
+  bool Update() override;
+  size_t CalculateNumChildren() override { return m_elements.size(); }
+  ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+private:
+  std::vector<ValueObjectSP> m_elements;
+  ValueObjectSP m_first;
+  CompilerType m_bool_type;
+  ByteOrder m_byte_order = eByteOrderInvalid;
+  uint8_t m_byte_size = 0;
+};
+} // namespace
+
+BitsetFrontEnd::BitsetFrontEnd(ValueObject &valobj)
+    : SyntheticChildrenFrontEnd(valobj) {
+  m_bool_type = valobj.GetCompilerType().GetBasicTypeFromAST(eBasicTypeBool);
+  if (auto target_sp = m_backend.GetTargetSP()) {
+    m_byte_order = target_sp->GetArchitecture().GetByteOrder();
+    m_byte_size = target_sp->GetArchitecture().GetAddressByteSize();
+    Update();
+  }
+}
+
+bool BitsetFrontEnd::Update() {
+  m_elements.clear();
+  m_first.reset();
+
+  TargetSP target_sp = m_backend.GetTargetSP();
+  if (!target_sp)
+    return false;
+  size_t capping_size = target_sp->GetMaximumNumberOfChildrenToDisplay();
+
+  size_t size = 0;
+  if (auto arg = m_backend.GetCompilerType().GetIntegralTemplateArgument(0))
+    size = arg->value.getLimitedValue(capping_size);
+
+  m_elements.assign(size, ValueObjectSP());
+
+  m_first = m_backend.GetChildMemberWithName(ConstString("__first_"), true);
+  return false;
+}
+
+ValueObjectSP BitsetFrontEnd::GetChildAtIndex(size_t idx) {
+  if (idx >= m_elements.size() || !m_first)
+    return ValueObjectSP();
+
+  if (m_elements[idx])
+    return m_elements[idx];
+
+  ExecutionContext ctx = m_backend.GetExecutionContextRef().Lock(false);
+  CompilerType type;
+  ValueObjectSP chunk;
+  // For small bitsets __first_ is not an array, but a plain size_t.
+  if (m_first->GetCompilerType().IsArrayType(&type, nullptr, nullptr))
+    chunk = m_first->GetChildAtIndex(
+        idx / type.GetBitSize(ctx.GetBestExecutionContextScope()), true);
+  else {
+    type = m_first->GetCompilerType();
+    chunk = m_first;
+  }
+  if (!type || !chunk)
+    return ValueObjectSP();
+
+  size_t chunk_idx = idx % type.GetBitSize(ctx.GetBestExecutionContextScope());
+  uint8_t value = !!(chunk->GetValueAsUnsigned(0) & (uint64_t(1) << chunk_idx));
+  DataExtractor data(&value, sizeof(value), m_byte_order, m_byte_size);
+
+  m_elements[idx] = CreateValueObjectFromData(llvm::formatv("[{0}]", idx).str(),
+                                              data, ctx, m_bool_type);
+
+  return m_elements[idx];
+}
+
+SyntheticChildrenFrontEnd *formatters::LibcxxBitsetSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  if (valobj_sp)
+    return new BitsetFrontEnd(*valobj_sp);
+  return nullptr;
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxInitializerList.cpp

@@ -0,0 +1,128 @@
+//===-- LibCxxInitializerList.cpp -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "LibCxx.h"
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Utility/ConstString.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::formatters;
+
+namespace lldb_private {
+namespace formatters {
+class LibcxxInitializerListSyntheticFrontEnd
+    : public SyntheticChildrenFrontEnd {
+public:
+  LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~LibcxxInitializerListSyntheticFrontEnd() override;
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+
+private:
+  ValueObject *m_start;
+  CompilerType m_element_type;
+  uint32_t m_element_size;
+  size_t m_num_elements;
+};
+} // namespace formatters
+} // namespace lldb_private
+
+lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_start(nullptr), m_element_type(),
+      m_element_size(0), m_num_elements(0) {
+  if (valobj_sp)
+    Update();
+}
+
+lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    ~LibcxxInitializerListSyntheticFrontEnd() {
+  // this needs to stay around because it's a child object who will follow its
+  // parent's life cycle
+  // delete m_start;
+}
+
+size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    CalculateNumChildren() {
+  static ConstString g___size_("__size_");
+  m_num_elements = 0;
+  ValueObjectSP size_sp(m_backend.GetChildMemberWithName(g___size_, true));
+  if (size_sp)
+    m_num_elements = size_sp->GetValueAsUnsigned(0);
+  return m_num_elements;
+}
+
+lldb::ValueObjectSP lldb_private::formatters::
+    LibcxxInitializerListSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
+  if (!m_start)
+    return lldb::ValueObjectSP();
+
+  uint64_t offset = idx * m_element_size;
+  offset = offset + m_start->GetValueAsUnsigned(0);
+  StreamString name;
+  name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+  return CreateValueObjectFromAddress(name.GetString(), offset,
+                                      m_backend.GetExecutionContextRef(),
+                                      m_element_type);
+}
+
+bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    Update() {
+  static ConstString g___begin_("__begin_");
+
+  m_start = nullptr;
+  m_num_elements = 0;
+  m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
+  if (!m_element_type.IsValid())
+    return false;
+
+  m_element_size = m_element_type.GetByteSize(nullptr);
+
+  if (m_element_size > 0)
+    m_start =
+        m_backend.GetChildMemberWithName(g___begin_, true)
+            .get(); // store raw pointers or end up with a circular dependency
+
+  return false;
+}
+
+bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    MightHaveChildren() {
+  return true;
+}
+
+size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
+    GetIndexOfChildWithName(const ConstString &name) {
+  if (!m_start)
+    return UINT32_MAX;
+  return ExtractIndexFromString(name.GetCString());
+}
+
+lldb_private::SyntheticChildrenFrontEnd *
+lldb_private::formatters::LibcxxInitializerListSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp)
+                    : nullptr);
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp

@@ -0,0 +1,449 @@
+//===-- LibCxxList.cpp ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "LibCxx.h"
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Symbol/ClangASTContext.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;
+
+namespace {
+
+class ListEntry {
+public:
+  ListEntry() = default;
+  ListEntry(ValueObjectSP entry_sp) : m_entry_sp(entry_sp) {}
+  ListEntry(const ListEntry &rhs) = default;
+  ListEntry(ValueObject *entry)
+      : m_entry_sp(entry ? entry->GetSP() : ValueObjectSP()) {}
+
+  ListEntry next() {
+    static ConstString g_next("__next_");
+
+    if (!m_entry_sp)
+      return ListEntry();
+    return ListEntry(m_entry_sp->GetChildMemberWithName(g_next, true));
+  }
+
+  ListEntry prev() {
+    static ConstString g_prev("__prev_");
+
+    if (!m_entry_sp)
+      return ListEntry();
+    return ListEntry(m_entry_sp->GetChildMemberWithName(g_prev, true));
+  }
+
+  uint64_t value() const {
+    if (!m_entry_sp)
+      return 0;
+    return m_entry_sp->GetValueAsUnsigned(0);
+  }
+
+  bool null() { return (value() == 0); }
+
+  explicit operator bool() { return GetEntry() && !null(); }
+
+  ValueObjectSP GetEntry() { return m_entry_sp; }
+
+  void SetEntry(ValueObjectSP entry) { m_entry_sp = entry; }
+
+  bool operator==(const ListEntry &rhs) const { return value() == rhs.value(); }
+
+  bool operator!=(const ListEntry &rhs) const { return !(*this == rhs); }
+
+private:
+  ValueObjectSP m_entry_sp;
+};
+
+class ListIterator {
+public:
+  ListIterator() = default;
+  ListIterator(ListEntry entry) : m_entry(entry) {}
+  ListIterator(ValueObjectSP entry) : m_entry(entry) {}
+  ListIterator(const ListIterator &rhs) = default;
+  ListIterator(ValueObject *entry) : m_entry(entry) {}
+
+  ValueObjectSP value() { return m_entry.GetEntry(); }
+
+  ValueObjectSP advance(size_t count) {
+    if (count == 0)
+      return m_entry.GetEntry();
+    if (count == 1) {
+      next();
+      return m_entry.GetEntry();
+    }
+    while (count > 0) {
+      next();
+      count--;
+      if (m_entry.null())
+        return lldb::ValueObjectSP();
+    }
+    return m_entry.GetEntry();
+  }
+
+  bool operator==(const ListIterator &rhs) const {
+    return (rhs.m_entry == m_entry);
+  }
+
+protected:
+  void next() { m_entry = m_entry.next(); }
+
+  void prev() { m_entry = m_entry.prev(); }
+
+private:
+  ListEntry m_entry;
+};
+
+class AbstractListFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  size_t GetIndexOfChildWithName(const ConstString &name) override {
+    return ExtractIndexFromString(name.GetCString());
+  }
+  bool MightHaveChildren() override { return true; }
+  bool Update() override;
+
+protected:
+  AbstractListFrontEnd(ValueObject &valobj)
+      : SyntheticChildrenFrontEnd(valobj) {}
+
+  size_t m_count;
+  ValueObject *m_head;
+
+  static constexpr bool g_use_loop_detect = true;
+  size_t m_loop_detected; // The number of elements that have had loop detection
+                          // run over them.
+  ListEntry m_slow_runner; // Used for loop detection
+  ListEntry m_fast_runner; // Used for loop detection
+
+  size_t m_list_capping_size;
+  CompilerType m_element_type;
+  std::map<size_t, ListIterator> m_iterators;
+
+  bool HasLoop(size_t count);
+  ValueObjectSP GetItem(size_t idx);
+};
+
+class ForwardListFrontEnd : public AbstractListFrontEnd {
+public:
+  ForwardListFrontEnd(ValueObject &valobj);
+
+  size_t CalculateNumChildren() override;
+  ValueObjectSP GetChildAtIndex(size_t idx) override;
+  bool Update() override;
+};
+
+class ListFrontEnd : public AbstractListFrontEnd {
+public:
+  ListFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~ListFrontEnd() override = default;
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+private:
+  lldb::addr_t m_node_address;
+  ValueObject *m_tail;
+};
+
+} // end anonymous namespace
+
+bool AbstractListFrontEnd::Update() {
+  m_loop_detected = 0;
+  m_count = UINT32_MAX;
+  m_head = nullptr;
+  m_list_capping_size = 0;
+  m_slow_runner.SetEntry(nullptr);
+  m_fast_runner.SetEntry(nullptr);
+  m_iterators.clear();
+
+  if (m_backend.GetTargetSP())
+    m_list_capping_size =
+        m_backend.GetTargetSP()->GetMaximumNumberOfChildrenToDisplay();
+  if (m_list_capping_size == 0)
+    m_list_capping_size = 255;
+
+  CompilerType list_type = m_backend.GetCompilerType();
+  if (list_type.IsReferenceType())
+    list_type = list_type.GetNonReferenceType();
+
+  if (list_type.GetNumTemplateArguments() == 0)
+    return false;
+  m_element_type = list_type.GetTypeTemplateArgument(0);
+
+  return false;
+}
+
+bool AbstractListFrontEnd::HasLoop(size_t count) {
+  if (!g_use_loop_detect)
+    return false;
+  // don't bother checking for a loop if we won't actually need to jump nodes
+  if (m_count < 2)
+    return false;
+
+  if (m_loop_detected == 0) {
+    // This is the first time we are being run (after the last update). Set up
+    // the loop
+    // invariant for the first element.
+    m_slow_runner = ListEntry(m_head).next();
+    m_fast_runner = m_slow_runner.next();
+    m_loop_detected = 1;
+  }
+
+  // Loop invariant:
+  // Loop detection has been run over the first m_loop_detected elements. If
+  // m_slow_runner ==
+  // m_fast_runner then the loop has been detected after m_loop_detected
+  // elements.
+  const size_t steps_to_run = std::min(count, m_count);
+  while (m_loop_detected < steps_to_run && m_slow_runner && m_fast_runner &&
+         m_slow_runner != m_fast_runner) {
+
+    m_slow_runner = m_slow_runner.next();
+    m_fast_runner = m_fast_runner.next().next();
+    m_loop_detected++;
+  }
+  if (count <= m_loop_detected)
+    return false; // No loop in the first m_loop_detected elements.
+  if (!m_slow_runner || !m_fast_runner)
+    return false; // Reached the end of the list. Definitely no loops.
+  return m_slow_runner == m_fast_runner;
+}
+
+ValueObjectSP AbstractListFrontEnd::GetItem(size_t idx) {
+  size_t advance = idx;
+  ListIterator current(m_head);
+  if (idx > 0) {
+    auto cached_iterator = m_iterators.find(idx - 1);
+    if (cached_iterator != m_iterators.end()) {
+      current = cached_iterator->second;
+      advance = 1;
+    }
+  }
+  ValueObjectSP value_sp = current.advance(advance);
+  m_iterators[idx] = current;
+  return value_sp;
+}
+
+ForwardListFrontEnd::ForwardListFrontEnd(ValueObject &valobj)
+    : AbstractListFrontEnd(valobj) {
+  Update();
+}
+
+size_t ForwardListFrontEnd::CalculateNumChildren() {
+  if (m_count != UINT32_MAX)
+    return m_count;
+
+  ListEntry current(m_head);
+  m_count = 0;
+  while (current && m_count < m_list_capping_size) {
+    ++m_count;
+    current = current.next();
+  }
+  return m_count;
+}
+
+ValueObjectSP ForwardListFrontEnd::GetChildAtIndex(size_t idx) {
+  if (idx >= CalculateNumChildren())
+    return nullptr;
+
+  if (!m_head)
+    return nullptr;
+
+  if (HasLoop(idx + 1))
+    return nullptr;
+
+  ValueObjectSP current_sp = GetItem(idx);
+  if (!current_sp)
+    return nullptr;
+
+  current_sp = current_sp->GetChildAtIndex(1, true); // get the __value_ child
+  if (!current_sp)
+    return nullptr;
+
+  // we need to copy current_sp into a new object otherwise we will end up with
+  // all items named __value_
+  DataExtractor data;
+  Status error;
+  current_sp->GetData(data, error);
+  if (error.Fail())
+    return nullptr;
+
+  return CreateValueObjectFromData(llvm::formatv("[{0}]", idx).str(), data,
+                                   m_backend.GetExecutionContextRef(),
+                                   m_element_type);
+}
+
+static ValueObjectSP GetValueOfCompressedPair(ValueObject &pair) {
+  ValueObjectSP value = pair.GetChildMemberWithName(ConstString("__value_"), true);
+  if (! value) {
+    // pre-r300140 member name
+    value = pair.GetChildMemberWithName(ConstString("__first_"), true);
+  }
+  return value;
+}
+
+bool ForwardListFrontEnd::Update() {
+  AbstractListFrontEnd::Update();
+
+  Status err;
+  ValueObjectSP backend_addr(m_backend.AddressOf(err));
+  if (err.Fail() || !backend_addr)
+    return false;
+
+  ValueObjectSP impl_sp(
+      m_backend.GetChildMemberWithName(ConstString("__before_begin_"), true));
+  if (!impl_sp)
+    return false;
+  impl_sp = GetValueOfCompressedPair(*impl_sp);
+  if (!impl_sp)
+    return false;
+  m_head = impl_sp->GetChildMemberWithName(ConstString("__next_"), true).get();
+  return false;
+}
+
+ListFrontEnd::ListFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : AbstractListFrontEnd(*valobj_sp), m_node_address(), m_tail(nullptr) {
+  if (valobj_sp)
+    Update();
+}
+
+size_t ListFrontEnd::CalculateNumChildren() {
+  if (m_count != UINT32_MAX)
+    return m_count;
+  if (!m_head || !m_tail || m_node_address == 0)
+    return 0;
+  ValueObjectSP size_alloc(
+      m_backend.GetChildMemberWithName(ConstString("__size_alloc_"), true));
+  if (size_alloc) {
+    ValueObjectSP value = GetValueOfCompressedPair(*size_alloc);
+    if (value) {
+      m_count = value->GetValueAsUnsigned(UINT32_MAX);
+    }
+  }
+  if (m_count != UINT32_MAX) {
+    return m_count;
+  } else {
+    uint64_t next_val = m_head->GetValueAsUnsigned(0);
+    uint64_t prev_val = m_tail->GetValueAsUnsigned(0);
+    if (next_val == 0 || prev_val == 0)
+      return 0;
+    if (next_val == m_node_address)
+      return 0;
+    if (next_val == prev_val)
+      return 1;
+    uint64_t size = 2;
+    ListEntry current(m_head);
+    while (current.next() && current.next().value() != m_node_address) {
+      size++;
+      current = current.next();
+      if (size > m_list_capping_size)
+        break;
+    }
+    return m_count = (size - 1);
+  }
+}
+
+lldb::ValueObjectSP ListFrontEnd::GetChildAtIndex(size_t idx) {
+  static ConstString g_value("__value_");
+  static ConstString g_next("__next_");
+
+  if (idx >= CalculateNumChildren())
+    return lldb::ValueObjectSP();
+
+  if (!m_head || !m_tail || m_node_address == 0)
+    return lldb::ValueObjectSP();
+
+  if (HasLoop(idx + 1))
+    return lldb::ValueObjectSP();
+
+  ValueObjectSP current_sp = GetItem(idx);
+  if (!current_sp)
+    return lldb::ValueObjectSP();
+
+  current_sp = current_sp->GetChildAtIndex(1, true); // get the __value_ child
+  if (!current_sp)
+    return lldb::ValueObjectSP();
+
+  if (current_sp->GetName() == g_next) {
+    ProcessSP process_sp(current_sp->GetProcessSP());
+    if (!process_sp)
+      return nullptr;
+
+    // if we grabbed the __next_ pointer, then the child is one pointer deep-er
+    lldb::addr_t addr = current_sp->GetParent()->GetPointerValue();
+    addr = addr + 2 * process_sp->GetAddressByteSize();
+    ExecutionContext exe_ctx(process_sp);
+    current_sp =
+        CreateValueObjectFromAddress("__value_", addr, exe_ctx, m_element_type);
+  }
+
+  // we need to copy current_sp into a new object otherwise we will end up with
+  // all items named __value_
+  DataExtractor data;
+  Status error;
+  current_sp->GetData(data, error);
+  if (error.Fail())
+    return lldb::ValueObjectSP();
+
+  StreamString name;
+  name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+  return CreateValueObjectFromData(name.GetString(), data,
+                                   m_backend.GetExecutionContextRef(),
+                                   m_element_type);
+}
+
+bool ListFrontEnd::Update() {
+  AbstractListFrontEnd::Update();
+  m_tail = nullptr;
+  m_node_address = 0;
+
+  Status err;
+  ValueObjectSP backend_addr(m_backend.AddressOf(err));
+  if (err.Fail() || !backend_addr)
+    return false;
+  m_node_address = backend_addr->GetValueAsUnsigned(0);
+  if (!m_node_address || m_node_address == LLDB_INVALID_ADDRESS)
+    return false;
+  ValueObjectSP impl_sp(
+      m_backend.GetChildMemberWithName(ConstString("__end_"), true));
+  if (!impl_sp)
+    return false;
+  m_head = impl_sp->GetChildMemberWithName(ConstString("__next_"), true).get();
+  m_tail = impl_sp->GetChildMemberWithName(ConstString("__prev_"), true).get();
+  return false;
+}
+
+SyntheticChildrenFrontEnd *formatters::LibcxxStdListSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return (valobj_sp ? new ListFrontEnd(valobj_sp) : nullptr);
+}
+
+SyntheticChildrenFrontEnd *
+formatters::LibcxxStdForwardListSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return valobj_sp ? new ForwardListFrontEnd(*valobj_sp) : nullptr;
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp

@@ -0,0 +1,468 @@
+//===-- LibCxxMap.cpp -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "LibCxx.h"
+
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Symbol/ClangASTContext.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;
+
+class MapEntry {
+public:
+  MapEntry() = default;
+  explicit MapEntry(ValueObjectSP entry_sp) : m_entry_sp(entry_sp) {}
+  MapEntry(const MapEntry &rhs) = default;
+  explicit MapEntry(ValueObject *entry)
+      : m_entry_sp(entry ? entry->GetSP() : ValueObjectSP()) {}
+
+  ValueObjectSP left() const {
+    static ConstString g_left("__left_");
+    if (!m_entry_sp)
+      return m_entry_sp;
+    return m_entry_sp->GetSyntheticChildAtOffset(
+        0, m_entry_sp->GetCompilerType(), true);
+  }
+
+  ValueObjectSP right() const {
+    static ConstString g_right("__right_");
+    if (!m_entry_sp)
+      return m_entry_sp;
+    return m_entry_sp->GetSyntheticChildAtOffset(
+        m_entry_sp->GetProcessSP()->GetAddressByteSize(),
+        m_entry_sp->GetCompilerType(), true);
+  }
+
+  ValueObjectSP parent() const {
+    static ConstString g_parent("__parent_");
+    if (!m_entry_sp)
+      return m_entry_sp;
+    return m_entry_sp->GetSyntheticChildAtOffset(
+        2 * m_entry_sp->GetProcessSP()->GetAddressByteSize(),
+        m_entry_sp->GetCompilerType(), true);
+  }
+
+  uint64_t value() const {
+    if (!m_entry_sp)
+      return 0;
+    return m_entry_sp->GetValueAsUnsigned(0);
+  }
+
+  bool error() const {
+    if (!m_entry_sp)
+      return true;
+    return m_entry_sp->GetError().Fail();
+  }
+
+  bool null() const { return (value() == 0); }
+
+  ValueObjectSP GetEntry() const { return m_entry_sp; }
+
+  void SetEntry(ValueObjectSP entry) { m_entry_sp = entry; }
+
+  bool operator==(const MapEntry &rhs) const {
+    return (rhs.m_entry_sp.get() == m_entry_sp.get());
+  }
+
+private:
+  ValueObjectSP m_entry_sp;
+};
+
+class MapIterator {
+public:
+  MapIterator() = default;
+  MapIterator(MapEntry entry, size_t depth = 0)
+      : m_entry(entry), m_max_depth(depth), m_error(false) {}
+  MapIterator(ValueObjectSP entry, size_t depth = 0)
+      : m_entry(entry), m_max_depth(depth), m_error(false) {}
+  MapIterator(const MapIterator &rhs)
+      : m_entry(rhs.m_entry), m_max_depth(rhs.m_max_depth), m_error(false) {}
+  MapIterator(ValueObject *entry, size_t depth = 0)
+      : m_entry(entry), m_max_depth(depth), m_error(false) {}
+
+  ValueObjectSP value() { return m_entry.GetEntry(); }
+
+  ValueObjectSP advance(size_t count) {
+    ValueObjectSP fail;
+    if (m_error)
+      return fail;
+    size_t steps = 0;
+    while (count > 0) {
+      next();
+      count--, steps++;
+      if (m_error || m_entry.null() || (steps > m_max_depth))
+        return fail;
+    }
+    return m_entry.GetEntry();
+  }
+
+protected:
+  void next() {
+    if (m_entry.null())
+      return;
+    MapEntry right(m_entry.right());
+    if (!right.null()) {
+      m_entry = tree_min(std::move(right));
+      return;
+    }
+    size_t steps = 0;
+    while (!is_left_child(m_entry)) {
+      if (m_entry.error()) {
+        m_error = true;
+        return;
+      }
+      m_entry.SetEntry(m_entry.parent());
+      steps++;
+      if (steps > m_max_depth) {
+        m_entry = MapEntry();
+        return;
+      }
+    }
+    m_entry = MapEntry(m_entry.parent());
+  }
+
+private:
+  MapEntry tree_min(MapEntry &&x) {
+    if (x.null())
+      return MapEntry();
+    MapEntry left(x.left());
+    size_t steps = 0;
+    while (!left.null()) {
+      if (left.error()) {
+        m_error = true;
+        return MapEntry();
+      }
+      x = left;
+      left.SetEntry(x.left());
+      steps++;
+      if (steps > m_max_depth)
+        return MapEntry();
+    }
+    return x;
+  }
+
+  bool is_left_child(const MapEntry &x) {
+    if (x.null())
+      return false;
+    MapEntry rhs(x.parent());
+    rhs.SetEntry(rhs.left());
+    return x.value() == rhs.value();
+  }
+
+  MapEntry m_entry;
+  size_t m_max_depth;
+  bool m_error;
+};
+
+namespace lldb_private {
+namespace formatters {
+class LibcxxStdMapSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  LibcxxStdMapSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
+
+  ~LibcxxStdMapSyntheticFrontEnd() override = default;
+
+  size_t CalculateNumChildren() override;
+
+  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+  bool Update() override;
+
+  bool MightHaveChildren() override;
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override;
+
+private:
+  bool GetDataType();
+
+  void GetValueOffset(const lldb::ValueObjectSP &node);
+
+  ValueObject *m_tree;
+  ValueObject *m_root_node;
+  CompilerType m_element_type;
+  uint32_t m_skip_size;
+  size_t m_count;
+  std::map<size_t, MapIterator> m_iterators;
+};
+} // namespace formatters
+} // namespace lldb_private
+
+lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::
+    LibcxxStdMapSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
+    : SyntheticChildrenFrontEnd(*valobj_sp), m_tree(nullptr),
+      m_root_node(nullptr), m_element_type(), m_skip_size(UINT32_MAX),
+      m_count(UINT32_MAX), m_iterators() {
+  if (valobj_sp)
+    Update();
+}
+
+size_t lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::
+    CalculateNumChildren() {
+  static ConstString g___pair3_("__pair3_");
+  static ConstString g___first_("__first_");
+  static ConstString g___value_("__value_");
+
+  if (m_count != UINT32_MAX)
+    return m_count;
+  if (m_tree == nullptr)
+    return 0;
+  ValueObjectSP m_item(m_tree->GetChildMemberWithName(g___pair3_, true));
+  if (!m_item)
+    return 0;
+
+  switch (m_item->GetCompilerType().GetNumDirectBaseClasses()) {
+  case 1:
+    // Assume a pre llvm r300140 __compressed_pair implementation:
+    m_item = m_item->GetChildMemberWithName(g___first_, true);
+    break;
+  case 2: {
+    // Assume a post llvm r300140 __compressed_pair implementation:
+    ValueObjectSP first_elem_parent = m_item->GetChildAtIndex(0, true);
+    m_item = first_elem_parent->GetChildMemberWithName(g___value_, true);
+    break;
+  }
+  default:
+    return false;
+  }
+
+  if (!m_item)
+    return 0;
+  m_count = m_item->GetValueAsUnsigned(0);
+  return m_count;
+}
+
+bool lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::GetDataType() {
+  static ConstString g___value_("__value_");
+  static ConstString g_tree_("__tree_");
+  static ConstString g_pair3("__pair3_");
+
+  if (m_element_type.GetOpaqueQualType() && m_element_type.GetTypeSystem())
+    return true;
+  m_element_type.Clear();
+  ValueObjectSP deref;
+  Status error;
+  deref = m_root_node->Dereference(error);
+  if (!deref || error.Fail())
+    return false;
+  deref = deref->GetChildMemberWithName(g___value_, true);
+  if (deref) {
+    m_element_type = deref->GetCompilerType();
+    return true;
+  }
+  deref = m_backend.GetChildAtNamePath({g_tree_, g_pair3});
+  if (!deref)
+    return false;
+  m_element_type = deref->GetCompilerType()
+                       .GetTypeTemplateArgument(1)
+                       .GetTypeTemplateArgument(1);
+  if (m_element_type) {
+    std::string name;
+    uint64_t bit_offset_ptr;
+    uint32_t bitfield_bit_size_ptr;
+    bool is_bitfield_ptr;
+    m_element_type = m_element_type.GetFieldAtIndex(
+        0, name, &bit_offset_ptr, &bitfield_bit_size_ptr, &is_bitfield_ptr);
+    m_element_type = m_element_type.GetTypedefedType();
+    return m_element_type.IsValid();
+  } else {
+    m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
+    return m_element_type.IsValid();
+  }
+}
+
+void lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::GetValueOffset(
+    const lldb::ValueObjectSP &node) {
+  if (m_skip_size != UINT32_MAX)
+    return;
+  if (!node)
+    return;
+  CompilerType node_type(node->GetCompilerType());
+  uint64_t bit_offset;
+  if (node_type.GetIndexOfFieldWithName("__value_", nullptr, &bit_offset) !=
+      UINT32_MAX) {
+    m_skip_size = bit_offset / 8u;
+  } else {
+    ClangASTContext *ast_ctx =
+        llvm::dyn_cast_or_null<ClangASTContext>(node_type.GetTypeSystem());
+    if (!ast_ctx)
+      return;
+    CompilerType tree_node_type = ast_ctx->CreateStructForIdentifier(
+        ConstString(),
+        {{"ptr0", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+         {"ptr1", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+         {"ptr2", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+         {"cw", ast_ctx->GetBasicType(lldb::eBasicTypeBool)},
+         {"payload", (m_element_type.GetCompleteType(), m_element_type)}});
+    std::string child_name;
+    uint32_t child_byte_size;
+    int32_t child_byte_offset = 0;
+    uint32_t child_bitfield_bit_size;
+    uint32_t child_bitfield_bit_offset;
+    bool child_is_base_class;
+    bool child_is_deref_of_parent;
+    uint64_t language_flags;
+    if (tree_node_type
+            .GetChildCompilerTypeAtIndex(
+                nullptr, 4, true, true, true, child_name, child_byte_size,
+                child_byte_offset, child_bitfield_bit_size,
+                child_bitfield_bit_offset, child_is_base_class,
+                child_is_deref_of_parent, nullptr, language_flags)
+            .IsValid())
+      m_skip_size = (uint32_t)child_byte_offset;
+  }
+}
+
+lldb::ValueObjectSP
+lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::GetChildAtIndex(
+    size_t idx) {
+  static ConstString g___cc("__cc");
+  static ConstString g___nc("__nc");
+  static ConstString g___value_("__value_");
+
+  if (idx >= CalculateNumChildren())
+    return lldb::ValueObjectSP();
+  if (m_tree == nullptr || m_root_node == nullptr)
+    return lldb::ValueObjectSP();
+
+  MapIterator iterator(m_root_node, CalculateNumChildren());
+
+  const bool need_to_skip = (idx > 0);
+  size_t actual_advancde = idx;
+  if (need_to_skip) {
+    auto cached_iterator = m_iterators.find(idx - 1);
+    if (cached_iterator != m_iterators.end()) {
+      iterator = cached_iterator->second;
+      actual_advancde = 1;
+    }
+  }
+
+  ValueObjectSP iterated_sp(iterator.advance(actual_advancde));
+  if (!iterated_sp) {
+    // this tree is garbage - stop
+    m_tree =
+        nullptr; // this will stop all future searches until an Update() happens
+    return iterated_sp;
+  }
+  if (GetDataType()) {
+    if (!need_to_skip) {
+      Status error;
+      iterated_sp = iterated_sp->Dereference(error);
+      if (!iterated_sp || error.Fail()) {
+        m_tree = nullptr;
+        return lldb::ValueObjectSP();
+      }
+      GetValueOffset(iterated_sp);
+      auto child_sp = iterated_sp->GetChildMemberWithName(g___value_, true);
+      if (child_sp)
+        iterated_sp = child_sp;
+      else
+        iterated_sp = iterated_sp->GetSyntheticChildAtOffset(
+            m_skip_size, m_element_type, true);
+      if (!iterated_sp) {
+        m_tree = nullptr;
+        return lldb::ValueObjectSP();
+      }
+    } else {
+      // because of the way our debug info is made, we need to read item 0 first
+      // so that we can cache information used to generate other elements
+      if (m_skip_size == UINT32_MAX)
+        GetChildAtIndex(0);
+      if (m_skip_size == UINT32_MAX) {
+        m_tree = nullptr;
+        return lldb::ValueObjectSP();
+      }
+      iterated_sp = iterated_sp->GetSyntheticChildAtOffset(
+          m_skip_size, m_element_type, true);
+      if (!iterated_sp) {
+        m_tree = nullptr;
+        return lldb::ValueObjectSP();
+      }
+    }
+  } else {
+    m_tree = nullptr;
+    return lldb::ValueObjectSP();
+  }
+  // at this point we have a valid
+  // we need to copy current_sp into a new object otherwise we will end up with
+  // all items named __value_
+  DataExtractor data;
+  Status error;
+  iterated_sp->GetData(data, error);
+  if (error.Fail()) {
+    m_tree = nullptr;
+    return lldb::ValueObjectSP();
+  }
+  StreamString name;
+  name.Printf("[%" PRIu64 "]", (uint64_t)idx);
+  auto potential_child_sp = CreateValueObjectFromData(
+      name.GetString(), data, m_backend.GetExecutionContextRef(),
+      m_element_type);
+  if (potential_child_sp) {
+    switch (potential_child_sp->GetNumChildren()) {
+    case 1: {
+      auto child0_sp = potential_child_sp->GetChildAtIndex(0, true);
+      if (child0_sp && child0_sp->GetName() == g___cc)
+        potential_child_sp = child0_sp->Clone(ConstString(name.GetString()));
+      break;
+    }
+    case 2: {
+      auto child0_sp = potential_child_sp->GetChildAtIndex(0, true);
+      auto child1_sp = potential_child_sp->GetChildAtIndex(1, true);
+      if (child0_sp && child0_sp->GetName() == g___cc && child1_sp &&
+          child1_sp->GetName() == g___nc)
+        potential_child_sp = child0_sp->Clone(ConstString(name.GetString()));
+      break;
+    }
+    }
+  }
+  m_iterators[idx] = iterator;
+  return potential_child_sp;
+}
+
+bool lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::Update() {
+  static ConstString g___tree_("__tree_");
+  static ConstString g___begin_node_("__begin_node_");
+  m_count = UINT32_MAX;
+  m_tree = m_root_node = nullptr;
+  m_iterators.clear();
+  m_tree = m_backend.GetChildMemberWithName(g___tree_, true).get();
+  if (!m_tree)
+    return false;
+  m_root_node = m_tree->GetChildMemberWithName(g___begin_node_, true).get();
+  return false;
+}
+
+bool lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::
+    MightHaveChildren() {
+  return true;
+}
+
+size_t lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::
+    GetIndexOfChildWithName(const ConstString &name) {
+  return ExtractIndexFromString(name.GetCString());
+}
+
+SyntheticChildrenFrontEnd *
+lldb_private::formatters::LibcxxStdMapSyntheticFrontEndCreator(
+    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
+  return (valobj_sp ? new LibcxxStdMapSyntheticFrontEnd(valobj_sp) : nullptr);
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp

@@ -0,0 +1,61 @@
+//===-- LibCxxQueue.cpp -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibCxx.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace {
+
+class QueueFrontEnd : public SyntheticChildrenFrontEnd {
+public:
+  QueueFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
+    Update();
+  }
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override {
+    return m_container_sp ? m_container_sp->GetIndexOfChildWithName(name)
+                          : UINT32_MAX;
+  }
+
+  bool MightHaveChildren() override { return true; }
+  bool Update() override;
+
+  size_t CalculateNumChildren() override {
+    return m_container_sp ? m_container_sp->GetNumChildren() : 0;
+  }
+
+  ValueObjectSP GetChildAtIndex(size_t idx) override {
+    return m_container_sp ? m_container_sp->GetChildAtIndex(idx, true)
+                          : nullptr;
+  }
+
+private:
+  ValueObjectSP m_container_sp;
+};
+} // namespace
+
+bool QueueFrontEnd::Update() {
+  m_container_sp.reset();
+  ValueObjectSP c_sp = m_backend.GetChildMemberWithName(ConstString("c"), true);
+  if (!c_sp)
+    return false;
+  m_container_sp = c_sp->GetSyntheticValue();
+  return false;
+}
+
+SyntheticChildrenFrontEnd *
+formatters::LibcxxQueueFrontEndCreator(CXXSyntheticChildren *,
+                                       lldb::ValueObjectSP valobj_sp) {
+  if (valobj_sp)
+    return new QueueFrontEnd(*valobj_sp);
+  return nullptr;
+}

external/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp

@@ -0,0 +1,83 @@
+//===-- LibCxxTuple.cpp -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibCxx.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace {
+
+class TupleFrontEnd: public SyntheticChildrenFrontEnd {
+public:
+  TupleFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
+    Update();
+  }
+
+  size_t GetIndexOfChildWithName(const ConstString &name) override {
+    return formatters::ExtractIndexFromString(name.GetCString());
+  }
+
+  bool MightHaveChildren() override { return true; }
+  bool Update() override;
+  size_t CalculateNumChildren() override { return m_elements.size(); }
+  ValueObjectSP GetChildAtIndex(size_t idx) override;
+
+private:
+  std::vector<ValueObjectSP> m_elements;
+  ValueObjectSP m_base_sp;
+};
+}
+
+bool TupleFrontEnd::Update() {
+  m_elements.clear();
+  m_base_sp = m_backend.GetChildMemberWithName(ConstString("__base_"), true);
+  if (! m_base_sp) {
+    // Pre r304382 name of the base element.
+    m_base_sp = m_backend.GetChildMemberWithName(ConstString("base_"), true);
+  }
+  if (! m_base_sp)
+    return false;
+  m_elements.assign(m_base_sp->GetCompilerType().GetNumDirectBaseClasses(),
+                    ValueObjectSP());
+  return false;
+}
+
+ValueObjectSP TupleFrontEnd::GetChildAtIndex(size_t idx) {
+  if (idx >= m_elements.size())
+    return ValueObjectSP();
+  if (!m_base_sp)
+    return ValueObjectSP();
+  if (m_elements[idx])
+    return m_elements[idx];
+
+  CompilerType holder_type =
+      m_base_sp->GetCompilerType().GetDirectBaseClassAtIndex(idx, nullptr);
+  if (!holder_type)
+    return ValueObjectSP();
+  ValueObjectSP holder_sp = m_base_sp->GetChildAtIndex(idx, true);
+  if (!holder_sp)
+    return ValueObjectSP();
+
+  ValueObjectSP elem_sp = holder_sp->GetChildAtIndex(0, true);
+  if (elem_sp)
+    m_elements[idx] =
+        elem_sp->Clone(ConstString(llvm::formatv("[{0}]", idx).str()));
+
+  return m_elements[idx];
+}
+
+SyntheticChildrenFrontEnd *
+formatters::LibcxxTupleFrontEndCreator(CXXSyntheticChildren *,
+                                       lldb::ValueObjectSP valobj_sp) {
+  if (valobj_sp)
+    return new TupleFrontEnd(*valobj_sp);
+  return nullptr;
+}