ObjCLanguage.cpp

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//===-- ObjCLanguage.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include <mutex>
 
#include "ObjCLanguage.h"
 
#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
#include "Plugins/ExpressionParser/Clang/ClangUtil.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/DataFormatters/DataVisualization.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/ValueObject/ValueObject.h"
 
#include "llvm/Support/Threading.h"
 
#include "Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.h"
#include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
 
#include "CF.h"
#include "Cocoa.h"
#include "CoreMedia.h"
#include "NSDictionary.h"
#include "NSSet.h"
#include "NSString.h"
 
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
 
LLDB_PLUGIN_DEFINE(ObjCLanguage)
 
void ObjCLanguage::Initialize() {
  PluginManager::RegisterPlugin(GetPluginNameStatic(), "Objective-C Language",
                                CreateInstance);
}
 
void ObjCLanguage::Terminate() {
  PluginManager::UnregisterPlugin(CreateInstance);
}
 
// Static Functions
 
Language *ObjCLanguage::CreateInstance(lldb::LanguageType language) {
  switch (language) {
  case lldb::eLanguageTypeObjC:
    return new ObjCLanguage();
  default:
    return nullptr;
  }
}
 
std::optional<const ObjCLanguage::ObjCMethodName>
ObjCLanguage::ObjCMethodName::Create(llvm::StringRef name, bool strict) {
  if (name.empty())
    return std::nullopt;
 
  // Objective-C method minimum requirements:
  //  - If `strict` is true, must start with '-' or '+' (1 char)
  //  - Must be followed by '[' (1 char)
  //  - Must have at least one character for class name (1 char)
  //  - Must have a space between class name and method name (1 char)
  //  - Must have at least one character for  method name (1 char)
  //  - Must be end with ']' (1 char)
  //  This means that the minimum size is 5 characters (6 if `strict`)
  //  e.g. [a a] (-[a a] or +[a a] if `strict`)
 
  // We can check length and ending invariants first
  if (name.size() < (5 + (strict ? 1 : 0)) || name.back() != ']')
    return std::nullopt;
 
  // Figure out type
  Type type = eTypeUnspecified;
  if (name.starts_with("+["))
    type = eTypeClassMethod;
  else if (name.starts_with("-["))
    type = eTypeInstanceMethod;
 
  // If there's no type and it's strict, this is invalid
  if (strict && type == eTypeUnspecified)
    return std::nullopt;
 
  // If not strict and type unspecified, make sure we start with '['
  if (type == eTypeUnspecified && name.front() != '[')
    return std::nullopt;
 
  // If we've gotten here, we're confident that this looks enough like an
  // Objective-C method to treat it like one.
  ObjCLanguage::ObjCMethodName method_name(name, type);
  return method_name;
}
 
llvm::StringRef ObjCLanguage::ObjCMethodName::GetClassName() const {
  llvm::StringRef full = m_full;
  const size_t class_start_pos = (full.front() == '[' ? 1 : 2);
  const size_t paren_pos = full.find('(', class_start_pos);
  // If there's a category we want to stop there
  if (paren_pos != llvm::StringRef::npos)
    return full.substr(class_start_pos, paren_pos - class_start_pos);
 
  // Otherwise we find the space separating the class and method
  const size_t space_pos = full.find(' ', class_start_pos);
  return full.substr(class_start_pos, space_pos - class_start_pos);
}
 
llvm::StringRef ObjCLanguage::ObjCMethodName::GetClassNameWithCategory() const {
  llvm::StringRef full = m_full;
  const size_t class_start_pos = (full.front() == '[' ? 1 : 2);
  const size_t space_pos = full.find(' ', class_start_pos);
  return full.substr(class_start_pos, space_pos - class_start_pos);
}
 
llvm::StringRef ObjCLanguage::ObjCMethodName::GetSelector() const {
  llvm::StringRef full = m_full;
  const size_t space_pos = full.find(' ');
  if (space_pos == llvm::StringRef::npos)
    return llvm::StringRef();
  const size_t closing_bracket = full.find(']', space_pos);
  return full.substr(space_pos + 1, closing_bracket - space_pos - 1);
}
 
llvm::StringRef ObjCLanguage::ObjCMethodName::GetCategory() const {
  llvm::StringRef full = m_full;
  const size_t open_paren_pos = full.find('(');
  const size_t close_paren_pos = full.find(')');
 
  if (open_paren_pos == llvm::StringRef::npos ||
      close_paren_pos == llvm::StringRef::npos)
    return llvm::StringRef();
 
  return full.substr(open_paren_pos + 1,
                     close_paren_pos - (open_paren_pos + 1));
}
 
std::string ObjCLanguage::ObjCMethodName::GetFullNameWithoutCategory() const {
  llvm::StringRef full = m_full;
  const size_t open_paren_pos = full.find('(');
  const size_t close_paren_pos = full.find(')');
  if (open_paren_pos == llvm::StringRef::npos ||
      close_paren_pos == llvm::StringRef::npos)
    return std::string();
 
  llvm::StringRef class_name = GetClassName();
  llvm::StringRef selector_name = GetSelector();
 
  // Compute the total size to avoid reallocations
  // class name + selector name + '[' + ' ' + ']'
  size_t total_size = class_name.size() + selector_name.size() + 3;
  if (m_type != eTypeUnspecified)
    total_size++; // For + or -
 
  std::string name_sans_category;
  name_sans_category.reserve(total_size);
 
  if (m_type == eTypeClassMethod)
    name_sans_category += '+';
  else if (m_type == eTypeInstanceMethod)
    name_sans_category += '-';
 
  name_sans_category += '[';
  name_sans_category.append(class_name.data(), class_name.size());
  name_sans_category += ' ';
  name_sans_category.append(selector_name.data(), selector_name.size());
  name_sans_category += ']';
 
  return name_sans_category;
}
 
std::vector<Language::MethodNameVariant>
ObjCLanguage::GetMethodNameVariants(llvm::StringRef method_name) const {
  std::vector<Language::MethodNameVariant> variant_names;
  std::optional<const ObjCLanguage::ObjCMethodName> objc_method =
      ObjCLanguage::ObjCMethodName::Create(method_name, false);
  if (!objc_method)
    return variant_names;
 
  variant_names.emplace_back(objc_method->GetSelector().str(),
                             lldb::eFunctionNameTypeSelector);
 
  const std::string name_sans_category =
      objc_method->GetFullNameWithoutCategory();
 
  if (objc_method->IsClassMethod() || objc_method->IsInstanceMethod()) {
    if (!name_sans_category.empty())
      variant_names.emplace_back(name_sans_category,
                                 lldb::eFunctionNameTypeFull);
  } else {
    StreamString strm;
 
    strm.Printf("+%s", objc_method->GetFullName().c_str());
    variant_names.emplace_back(strm.GetString().str(),
                               lldb::eFunctionNameTypeFull);
    strm.Clear();
 
    strm.Printf("-%s", objc_method->GetFullName().c_str());
    variant_names.emplace_back(strm.GetString().str(),
                               lldb::eFunctionNameTypeFull);
    strm.Clear();
 
    if (!name_sans_category.empty()) {
      strm.Printf("+%s", name_sans_category.c_str());
      variant_names.emplace_back(strm.GetString().str(),
                                 lldb::eFunctionNameTypeFull);
      strm.Clear();
 
      strm.Printf("-%s", name_sans_category.c_str());
      variant_names.emplace_back(strm.GetString().str(),
                                 lldb::eFunctionNameTypeFull);
    }
  }
 
  return variant_names;
}
 
std::pair<FunctionNameType, std::optional<ConstString>>
ObjCLanguage::GetFunctionNameInfo(ConstString name) const {
  FunctionNameType func_name_type = eFunctionNameTypeNone;
 
  if (ObjCLanguage::IsPossibleObjCMethodName(name.GetCString()))
    func_name_type = eFunctionNameTypeFull;
 
  if (ObjCLanguage::IsPossibleObjCSelector(name.GetCString()))
    func_name_type |= eFunctionNameTypeSelector;
 
  return {func_name_type, std::nullopt};
}
 
bool ObjCLanguage::SymbolNameFitsToLanguage(const Mangled &mangled) const {
  ConstString demangled_name = mangled.GetDemangledName();
  if (!demangled_name)
    return false;
  return ObjCLanguage::IsPossibleObjCMethodName(demangled_name.GetCString());
}
 
static void LoadObjCFormatters(TypeCategoryImplSP objc_category_sp) {
  if (!objc_category_sp)
    return;
 
  TypeSummaryImpl::Flags objc_flags;
  objc_flags.SetCascades(false)
      .SetSkipPointers(true)
      .SetSkipReferences(true)
      .SetDontShowChildren(true)
      .SetDontShowValue(true)
      .SetShowMembersOneLiner(false)
      .SetHideItemNames(false);
 
  lldb::TypeSummaryImplSP ObjC_BOOL_summary(new CXXFunctionSummaryFormat(
      objc_flags, lldb_private::formatters::ObjCBOOLSummaryProvider, ""));
  objc_category_sp->AddTypeSummary("BOOL", eFormatterMatchExact,
                                   ObjC_BOOL_summary);
  objc_category_sp->AddTypeSummary("BOOL &", eFormatterMatchExact,
                                   ObjC_BOOL_summary);
  objc_category_sp->AddTypeSummary("BOOL *", eFormatterMatchExact,
                                   ObjC_BOOL_summary);
 
  // we need to skip pointers here since we are special casing a SEL* when
  // retrieving its value
  objc_flags.SetSkipPointers(true);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCSELSummaryProvider<false>,
                "SEL summary provider", "SEL", objc_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCSELSummaryProvider<false>,
                "SEL summary provider", "struct objc_selector", objc_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCSELSummaryProvider<false>,
                "SEL summary provider", "objc_selector", objc_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCSELSummaryProvider<true>,
                "SEL summary provider", "objc_selector *", objc_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCSELSummaryProvider<true>,
                "SEL summary provider", "SEL *", objc_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::ObjCClassSummaryProvider,
                "Class summary provider", "Class", objc_flags);
 
  SyntheticChildren::Flags class_synth_flags;
  class_synth_flags.SetCascades(true).SetSkipPointers(false).SetSkipReferences(
      false);
 
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::ObjCClassSyntheticFrontEndCreator,
                  "Class synthetic children", "Class", class_synth_flags);
 
  objc_flags.SetSkipPointers(false);
  objc_flags.SetCascades(true);
  objc_flags.SetSkipReferences(false);
 
  AddStringSummary(objc_category_sp, "${var.__FuncPtr%A}",
                   "__block_literal_generic", objc_flags);
 
  AddStringSummary(objc_category_sp,
                   "${var.years} years, ${var.months} "
                   "months, ${var.days} days, ${var.hours} "
                   "hours, ${var.minutes} minutes "
                   "${var.seconds} seconds",
                   "CFGregorianUnits", objc_flags);
  AddStringSummary(objc_category_sp,
                   "location=${var.location} length=${var.length}", "CFRange",
                   objc_flags);
 
  AddStringSummary(objc_category_sp,
                   "location=${var.location}, length=${var.length}", "NSRange",
                   objc_flags);
  AddStringSummary(objc_category_sp, "(${var.origin}, ${var.size}), ...",
                   "NSRectArray", objc_flags);
 
  AddOneLineSummary(objc_category_sp, "NSPoint", objc_flags);
  AddOneLineSummary(objc_category_sp, "NSSize", objc_flags);
  AddOneLineSummary(objc_category_sp, "NSRect", objc_flags);
 
  AddOneLineSummary(objc_category_sp, "CGSize", objc_flags);
  AddOneLineSummary(objc_category_sp, "CGPoint", objc_flags);
  AddOneLineSummary(objc_category_sp, "CGRect", objc_flags);
 
  AddStringSummary(objc_category_sp,
                   "red=${var.red} green=${var.green} blue=${var.blue}",
                   "RGBColor", objc_flags);
  AddStringSummary(
      objc_category_sp,
      "(t=${var.top}, l=${var.left}, b=${var.bottom}, r=${var.right})", "Rect",
      objc_flags);
  AddStringSummary(objc_category_sp, "{(v=${var.v}, h=${var.h})}", "Point",
                   objc_flags);
  AddStringSummary(objc_category_sp,
                   "${var.month}/${var.day}/${var.year}  ${var.hour} "
                   ":${var.minute} :${var.second} dayOfWeek:${var.dayOfWeek}",
                   "DateTimeRect *", objc_flags);
  AddStringSummary(objc_category_sp,
                   "${var.ld.month}/${var.ld.day}/"
                   "${var.ld.year} ${var.ld.hour} "
                   ":${var.ld.minute} :${var.ld.second} "
                   "dayOfWeek:${var.ld.dayOfWeek}",
                   "LongDateRect", objc_flags);
  AddStringSummary(objc_category_sp, "(x=${var.x}, y=${var.y})", "HIPoint",
                   objc_flags);
  AddStringSummary(objc_category_sp, "origin=${var.origin} size=${var.size}",
                   "HIRect", objc_flags);
 
  TypeSummaryImpl::Flags appkit_flags;
  appkit_flags.SetCascades(true)
      .SetSkipPointers(false)
      .SetSkipReferences(false)
      .SetDontShowChildren(true)
      .SetDontShowValue(false)
      .SetShowMembersOneLiner(false)
      .SetHideItemNames(false);
 
  appkit_flags.SetDontShowChildren(false);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "NSArray", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "NSConstantArray", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "NSMutableArray", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "__NSArrayI", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "__NSArray0", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSArraySummaryProvider,
      "NSArray summary provider", "__NSSingleObjectArrayI", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "__NSArrayM", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "__NSCFArray", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "_NSCallStackArray", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "CFArrayRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSArraySummaryProvider,
                "NSArray summary provider", "CFMutableArrayRef", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "NSDictionary", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "NSConstantDictionary",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "NSMutableDictionary",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "__NSCFDictionary",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "__NSDictionaryI",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "__NSSingleEntryDictionaryI",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<false>,
                "NSDictionary summary provider", "__NSDictionaryM",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<true>,
                "NSDictionary summary provider", "CFDictionaryRef",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<true>,
                "NSDictionary summary provider", "__CFDictionary",
                appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDictionarySummaryProvider<true>,
                "NSDictionary summary provider", "CFMutableDictionaryRef",
                appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "NSSet summary", "NSSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "NSMutableSet summary", "NSMutableSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<true>,
                "CFSetRef summary", "CFSetRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<true>,
                "CFMutableSetRef summary", "CFMutableSetRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__NSCFSet summary", "__NSCFSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__CFSet summary", "__CFSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__NSSetI summary", "__NSSetI", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__NSSetM summary", "__NSSetM", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "NSCountedSet summary", "NSCountedSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "NSMutableSet summary", "NSMutableSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "NSOrderedSet summary", "NSOrderedSet", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__NSOrderedSetI summary", "__NSOrderedSetI", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSSetSummaryProvider<false>,
                "__NSOrderedSetM summary", "__NSOrderedSetM", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSError_SummaryProvider,
                "NSError summary provider", "NSError", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSException_SummaryProvider,
                "NSException summary provider", "NSException", appkit_flags);
 
  // AddSummary(appkit_category_sp, "${var.key%@} -> ${var.value%@}",
  // ConstString("$_lldb_typegen_nspair"), appkit_flags);
 
  appkit_flags.SetDontShowChildren(true);
 
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "__NSArrayM",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "__NSArrayI",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "__NSArray0",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "__NSSingleObjectArrayI",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "NSArray",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "NSConstantArray",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "NSMutableArray",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "__NSCFArray",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "_NSCallStackArray",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "CFMutableArrayRef",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSArraySyntheticFrontEndCreator,
                  "NSArray synthetic children", "CFArrayRef",
                  ScriptedSyntheticChildren::Flags());
 
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "__NSDictionaryM",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "NSConstantDictionary",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "__NSDictionaryI",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "__NSSingleEntryDictionaryI",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "__NSCFDictionary",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "NSDictionary",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "NSMutableDictionary",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "CFDictionaryRef",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "CFMutableDictionaryRef",
      ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(
      objc_category_sp,
      lldb_private::formatters::NSDictionarySyntheticFrontEndCreator,
      "NSDictionary synthetic children", "__CFDictionary",
      ScriptedSyntheticChildren::Flags());
 
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSErrorSyntheticFrontEndCreator,
                  "NSError synthetic children", "NSError",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSExceptionSyntheticFrontEndCreator,
                  "NSException synthetic children", "NSException",
                  ScriptedSyntheticChildren::Flags());
 
  AddCXXSynthetic(
      objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator,
      "NSSet synthetic children", "NSSet", ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__NSSetI synthetic children", "__NSSetI",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__NSSetM synthetic children", "__NSSetM",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__NSCFSet synthetic children", "__NSCFSet",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "CFSetRef synthetic children", "CFSetRef",
                  ScriptedSyntheticChildren::Flags());
 
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "NSMutableSet synthetic children", "NSMutableSet",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "NSOrderedSet synthetic children", "NSOrderedSet",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__NSOrderedSetI synthetic children", "__NSOrderedSetI",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__NSOrderedSetM synthetic children", "__NSOrderedSetM",
                  ScriptedSyntheticChildren::Flags());
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSSetSyntheticFrontEndCreator,
                  "__CFSet synthetic children", "__CFSet",
                  ScriptedSyntheticChildren::Flags());
 
  AddCXXSynthetic(objc_category_sp,
                  lldb_private::formatters::NSIndexPathSyntheticFrontEndCreator,
                  "NSIndexPath synthetic children", "NSIndexPath",
                  ScriptedSyntheticChildren::Flags());
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBagSummaryProvider,
                "CFBag summary provider", "CFBagRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBagSummaryProvider,
                "CFBag summary provider", "__CFBag", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBagSummaryProvider,
                "CFBag summary provider", "const struct __CFBag", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBagSummaryProvider,
                "CFBag summary provider", "CFMutableBagRef", appkit_flags);
 
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::CFBinaryHeapSummaryProvider,
      "CFBinaryHeap summary provider", "CFBinaryHeapRef", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::CFBinaryHeapSummaryProvider,
      "CFBinaryHeap summary provider", "__CFBinaryHeap", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "NSString", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "CFStringRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "__CFString", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSStringSummaryProvider,
      "NSString summary provider", "CFMutableStringRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "NSMutableString", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSStringSummaryProvider,
      "NSString summary provider", "__NSCFConstantString", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "__NSCFString", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSStringSummaryProvider,
      "NSString summary provider", "NSCFConstantString", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "NSCFString", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "NSPathStore2", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSStringSummaryProvider,
      "NSString summary provider", "NSTaggedPointerString", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSStringSummaryProvider,
                "NSString summary provider", "NSIndirectTaggedPointerString",
                appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSAttributedStringSummaryProvider,
                "NSAttributedString summary provider", "NSAttributedString",
                appkit_flags);
  AddCXXSummary(
      objc_category_sp,
      lldb_private::formatters::NSMutableAttributedStringSummaryProvider,
      "NSMutableAttributedString summary provider", "NSMutableAttributedString",
      appkit_flags);
  AddCXXSummary(
      objc_category_sp,
      lldb_private::formatters::NSMutableAttributedStringSummaryProvider,
      "NSMutableAttributedString summary provider",
      "NSConcreteMutableAttributedString", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSBundleSummaryProvider,
                "NSBundle summary provider", "NSBundle", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<false>,
                "NSData summary provider", "NSData", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<false>,
                "NSData summary provider", "_NSInlineData", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<false>,
                "NSData summary provider", "NSConcreteData", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>,
      "NSData summary provider", "NSConcreteMutableData", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<false>,
                "NSData summary provider", "NSMutableData", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<false>,
                "NSData summary provider", "__NSCFData", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<true>,
                "NSData summary provider", "CFDataRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDataSummaryProvider<true>,
                "NSData summary provider", "CFMutableDataRef", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSMachPortSummaryProvider,
                "NSMachPort summary provider", "NSMachPort", appkit_flags);
 
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSNotificationSummaryProvider,
      "NSNotification summary provider", "NSNotification", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNotificationSummaryProvider,
                "NSNotification summary provider", "NSConcreteNotification",
                appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "NSNumber summary provider", "NSNumber", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider,
      "NSNumber summary provider", "NSConstantIntegerNumber", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider,
      "NSNumber summary provider", "NSConstantDoubleNumber", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider,
      "NSNumber summary provider", "NSConstantFloatNumber", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "CFNumberRef summary provider", "CFNumberRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "NSNumber summary provider", "__NSCFBoolean", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "NSNumber summary provider", "__NSCFNumber", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "NSNumber summary provider", "NSCFBoolean", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSNumberSummaryProvider,
                "NSNumber summary provider", "NSCFNumber", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider,
      "NSDecimalNumber summary provider", "NSDecimalNumber", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSURLSummaryProvider,
                "NSURL summary provider", "NSURL", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSURLSummaryProvider,
                "NSURL summary provider", "CFURLRef", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDateSummaryProvider,
                "NSDate summary provider", "NSDate", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDateSummaryProvider,
                "NSDate summary provider", "__NSDate", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDateSummaryProvider,
                "NSDate summary provider", "__NSTaggedDate", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSDateSummaryProvider,
                "NSDate summary provider", "NSCalendarDate", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSTimeZoneSummaryProvider,
                "NSTimeZone summary provider", "NSTimeZone", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSTimeZoneSummaryProvider,
                "NSTimeZone summary provider", "CFTimeZoneRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSTimeZoneSummaryProvider,
                "NSTimeZone summary provider", "__NSTimeZone", appkit_flags);
 
  // CFAbsoluteTime is actually a double rather than a pointer to an object we
  // do not care about the numeric value, since it is probably meaningless to
  // users
  appkit_flags.SetDontShowValue(true);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::CFAbsoluteTimeSummaryProvider,
      "CFAbsoluteTime summary provider", "CFAbsoluteTime", appkit_flags);
  appkit_flags.SetDontShowValue(false);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::NSIndexSetSummaryProvider,
                "NSIndexSet summary provider", "NSIndexSet", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::NSIndexSetSummaryProvider,
      "NSIndexSet summary provider", "NSMutableIndexSet", appkit_flags);
 
  AddStringSummary(objc_category_sp,
                   "@\"${var.month%d}/${var.day%d}/${var.year%d} "
                   "${var.hour%d}:${var.minute%d}:${var.second}\"",
                   "CFGregorianDate", appkit_flags);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBitVectorSummaryProvider,
                "CFBitVector summary provider", "CFBitVectorRef", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider,
      "CFBitVector summary provider", "CFMutableBitVectorRef", appkit_flags);
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CFBitVectorSummaryProvider,
                "CFBitVector summary provider", "__CFBitVector", appkit_flags);
  AddCXXSummary(
      objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider,
      "CFBitVector summary provider", "__CFMutableBitVector", appkit_flags);
}
 
static void LoadCoreMediaFormatters(TypeCategoryImplSP objc_category_sp) {
  if (!objc_category_sp)
    return;
 
  TypeSummaryImpl::Flags cm_flags;
  cm_flags.SetCascades(true)
      .SetDontShowChildren(false)
      .SetDontShowValue(false)
      .SetHideItemNames(false)
      .SetShowMembersOneLiner(false)
      .SetSkipPointers(false)
      .SetSkipReferences(false);
 
  AddCXXSummary(objc_category_sp,
                lldb_private::formatters::CMTimeSummaryProvider,
                "CMTime summary provider", "CMTime", cm_flags);
}
 
lldb::TypeCategoryImplSP ObjCLanguage::GetFormatters() {
  static llvm::once_flag g_initialize;
  static TypeCategoryImplSP g_category;
 
  llvm::call_once(g_initialize, [this]() -> void {
    DataVisualization::Categories::GetCategory(ConstString(GetPluginName()),
                                               g_category);
    if (g_category) {
      LoadCoreMediaFormatters(g_category);
      LoadObjCFormatters(g_category);
    }
  });
  return g_category;
}
 
HardcodedFormatters::HardcodedSyntheticFinder
ObjCLanguage::GetHardcodedSynthetics() {
  static llvm::once_flag g_initialize;
  static HardcodedFormatters::HardcodedSyntheticFinder g_formatters;
 
  llvm::call_once(g_initialize, []() -> void {
    // An Objective-C tagged pointer (e.g. a single-index NSIndexSet
    // or a small NSNumber) packs its whole state into the pointer
    // bits and has no object in memory. Since its declared base
    // classes and ivars cannot be read, this synthtic child provider
    // hides them. Other synthetic child providers take precedence of
    // this.
    g_formatters.push_back(
        [](lldb_private::ValueObject &valobj, lldb::DynamicValueType,
           FormatManager &) -> SyntheticChildren::SharedPointer {
          static CXXSyntheticChildren::SharedPointer formatter_sp(
              new CXXSyntheticChildren(
                  SyntheticChildren::Flags()
                      .SetCascades(true)
                      .SetSkipPointers(false)
                      .SetSkipReferences(false)
                      .SetNonCacheable(true),
                  "tagged pointer synthetic children",
                  lldb_private::formatters::ObjCClassSyntheticFrontEndCreator));
 
          ProcessSP process_sp = valobj.GetProcessSP();
          if (!process_sp)
            return nullptr;
          if (ObjCLanguageRuntime *runtime =
                  ObjCLanguageRuntime::Get(*process_sp))
            if (runtime->IsTaggedPointerValue(valobj))
              return formatter_sp;
          return nullptr;
        });
  });
 
  return g_formatters;
}
 
std::vector<FormattersMatchCandidate>
ObjCLanguage::GetPossibleFormattersMatches(ValueObject &valobj,
                                           lldb::DynamicValueType use_dynamic) {
  std::vector<FormattersMatchCandidate> result;
 
  if (use_dynamic == lldb::eNoDynamicValues)
    return result;
 
  CompilerType compiler_type(valobj.GetCompilerType());
 
  const bool check_cpp = false;
  const bool check_objc = true;
  bool canBeObjCDynamic =
      compiler_type.IsPossibleDynamicType(nullptr, check_cpp, check_objc);
 
  if (canBeObjCDynamic && ClangUtil::IsClangType(compiler_type)) {
    do {
      lldb::ProcessSP process_sp = valobj.GetProcessSP();
      if (!process_sp)
        break;
      ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process_sp);
      if (runtime == nullptr)
        break;
      ObjCLanguageRuntime::ClassDescriptorSP objc_class_sp(
          runtime->GetClassDescriptor(valobj));
      if (!objc_class_sp)
        break;
      if (ConstString name = objc_class_sp->GetClassName())
        result.push_back(
            {name, valobj.GetTargetSP()->GetDebugger().GetScriptInterpreter(),
             TypeImpl(objc_class_sp->GetType()),
             FormattersMatchCandidate::Flags{}});
    } while (false);
  }
 
  return result;
}
 
std::unique_ptr<Language::TypeScavenger> ObjCLanguage::GetTypeScavenger() {
  class ObjCScavengerResult : public Language::TypeScavenger::Result {
  public:
    ObjCScavengerResult(CompilerType type)
        : Language::TypeScavenger::Result(), m_compiler_type(type) {}
 
    bool IsValid() override { return m_compiler_type.IsValid(); }
 
    bool DumpToStream(Stream &stream, bool print_help_if_available) override {
      if (IsValid()) {
        m_compiler_type.DumpTypeDescription(&stream);
        stream.EOL();
        return true;
      }
      return false;
    }
 
  private:
    CompilerType m_compiler_type;
  };
 
  class ObjCRuntimeScavenger : public Language::TypeScavenger {
  protected:
    bool Find_Impl(ExecutionContextScope *exe_scope, const char *key,
                   ResultSet &results) override {
      bool result = false;
 
      if (auto *process = exe_scope->CalculateProcess().get()) {
        if (auto *objc_runtime = ObjCLanguageRuntime::Get(*process)) {
          if (auto *decl_vendor = objc_runtime->GetDeclVendor()) {
            ConstString name(key);
            for (const CompilerType &type :
                 decl_vendor->FindTypes(name, /*max_matches*/ UINT32_MAX)) {
              result = true;
              std::unique_ptr<Language::TypeScavenger::Result> result(
                  new ObjCScavengerResult(type));
              results.insert(std::move(result));
            }
          }
        }
      }
 
      return result;
    }
 
    friend class lldb_private::ObjCLanguage;
  };
 
  class ObjCModulesScavenger : public Language::TypeScavenger {
  protected:
    bool Find_Impl(ExecutionContextScope *exe_scope, const char *key,
                   ResultSet &results) override {
      bool result = false;
 
      if (auto *target = exe_scope->CalculateTarget().get()) {
        auto *persistent_vars = llvm::cast<ClangPersistentVariables>(
            target->GetPersistentExpressionStateForLanguage(
                lldb::eLanguageTypeC));
        if (std::shared_ptr<ClangModulesDeclVendor> clang_modules_decl_vendor =
                persistent_vars->GetClangModulesDeclVendor()) {
          ConstString key_cs(key);
          auto types = clang_modules_decl_vendor->FindTypes(
              key_cs, /*max_matches*/ UINT32_MAX);
          if (!types.empty()) {
            result = true;
            std::unique_ptr<Language::TypeScavenger::Result> result(
                new ObjCScavengerResult(types.front()));
            results.insert(std::move(result));
          }
        }
      }
 
      return result;
    }
 
    friend class lldb_private::ObjCLanguage;
  };
 
  class ObjCDebugInfoScavenger : public Language::ImageListTypeScavenger {
  public:
    CompilerType AdjustForInclusion(CompilerType &candidate) override {
      LanguageType lang_type(candidate.GetMinimumLanguage());
      if (!Language::LanguageIsObjC(lang_type))
        return CompilerType();
      if (candidate.IsTypedefType())
        return candidate.GetTypedefedType();
      return candidate;
    }
  };
 
  return std::unique_ptr<TypeScavenger>(
      new Language::EitherTypeScavenger<ObjCModulesScavenger,
                                        ObjCRuntimeScavenger,
                                        ObjCDebugInfoScavenger>());
}
 
std::pair<llvm::StringRef, llvm::StringRef>
ObjCLanguage::GetFormatterPrefixSuffix(llvm::StringRef type_hint) {
  static constexpr llvm::StringRef empty;
  static const llvm::StringMap<
      std::pair<const llvm::StringRef, const llvm::StringRef>>
      g_affix_map = {
          {"CFBag", {"@", empty}},
          {"CFBinaryHeap", {"@", empty}},
          {"NSString", {"@", empty}},
          {"NSString*", {"@", empty}},
          {"NSNumber:char", {"(char)", empty}},
          {"NSNumber:short", {"(short)", empty}},
          {"NSNumber:int", {"(int)", empty}},
          {"NSNumber:long", {"(long)", empty}},
          {"NSNumber:int128_t", {"(int128_t)", empty}},
          {"NSNumber:float", {"(float)", empty}},
          {"NSNumber:double", {"(double)", empty}},
          {"NSData", {"@\"", "\""}},
          {"NSArray", {"@\"", "\""}},
      };
  return g_affix_map.lookup(type_hint);
}
 
bool ObjCLanguage::IsNilReference(ValueObject &valobj) {
  const uint32_t mask = eTypeIsObjC | eTypeIsPointer;
  bool isObjCpointer =
      (((valobj.GetCompilerType().GetTypeInfo(nullptr)) & mask) == mask);
  if (!isObjCpointer)
    return false;
  bool canReadValue = true;
  bool isZero = valobj.GetValueAsUnsigned(0, &canReadValue) == 0;
  return canReadValue && isZero;
}
 
bool ObjCLanguage::IsSourceFile(llvm::StringRef file_path) const {
  const auto suffixes = {".h", ".m", ".M"};
  for (auto suffix : suffixes) {
    if (file_path.ends_with_insensitive(suffix))
      return true;
  }
  return false;
}
 
std::optional<bool>
ObjCLanguage::GetBooleanFromString(llvm::StringRef str) const {
  return llvm::StringSwitch<std::optional<bool>>(str)
      .Case("YES", {true})
      .Case("NO", {false})
      .Default({});
}
 
bool ObjCLanguage::IsPossibleObjCMethodName(llvm::StringRef name) {
  if (!name.starts_with("-[") && !name.starts_with("+["))
    return false;
 
  return name.ends_with("]");
}