//===-- ObjCLanguage.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
#include <mutex>

// Other libraries and framework includes
// Project includes
#include "ObjCLanguage.h"

#include "lldb/Core/ConstString.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/DataFormatters/DataVisualization.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Symbol/ClangASTContext.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;

void
ObjCLanguage::Initialize()
{
    PluginManager::RegisterPlugin (GetPluginNameStatic(),
                                   "Objective-C Language",
                                   CreateInstance);
}

void
ObjCLanguage::Terminate()
{
    PluginManager::UnregisterPlugin (CreateInstance);
}

lldb_private::ConstString
ObjCLanguage::GetPluginNameStatic()
{
    static ConstString g_name("objc");
    return g_name;
}

//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------

lldb_private::ConstString
ObjCLanguage::GetPluginName()
{
    return GetPluginNameStatic();
}

uint32_t
ObjCLanguage::GetPluginVersion()
{
    return 1;
}

//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------

Language *
ObjCLanguage::CreateInstance (lldb::LanguageType language)
{
    switch (language)
    {
        case lldb::eLanguageTypeObjC:
            return new ObjCLanguage();
        default:
            return nullptr;
    }
}

void
ObjCLanguage::MethodName::Clear()
{
    m_full.Clear();
    m_class.Clear();
    m_category.Clear();
    m_selector.Clear();
    m_type = eTypeUnspecified;
    m_category_is_valid = false;
}

bool
ObjCLanguage::MethodName::SetName (const char *name, bool strict)
{
    Clear();
    if (name && name[0])
    {
        // If "strict" is true. then the method must be specified with a
        // '+' or '-' at the beginning. If "strict" is false, then the '+'
        // or '-' can be omitted
        bool valid_prefix = false;
        
        if (name[0] == '+' || name[0] == '-')
        {
            valid_prefix = name[1] == '[';
            if (name[0] == '+')
                m_type = eTypeClassMethod;
            else
                m_type = eTypeInstanceMethod;
        }
        else if (!strict)
        {
            // "strict" is false, the name just needs to start with '['
            valid_prefix = name[0] == '[';
        }
        
        if (valid_prefix)
        {
            int name_len = strlen (name);
            // Objective C methods must have at least:
            //      "-[" or "+[" prefix
            //      One character for a class name
            //      One character for the space between the class name
            //      One character for the method name
            //      "]" suffix
            if (name_len >= (5 + (strict ? 1 : 0)) && name[name_len - 1] == ']')
            {
                m_full.SetCStringWithLength(name, name_len);
            }
        }
    }
    return IsValid(strict);
}

const ConstString &
ObjCLanguage::MethodName::GetClassName ()
{
    if (!m_class)
    {
        if (IsValid(false))
        {
            const char *full = m_full.GetCString();
            const char *class_start = (full[0] == '[' ? full + 1 : full + 2);
            const char *paren_pos = strchr (class_start, '(');
            if (paren_pos)
            {
                m_class.SetCStringWithLength (class_start, paren_pos - class_start);
            }
            else
            {
                // No '(' was found in the full name, we can definitively say
                // that our category was valid (and empty).
                m_category_is_valid = true;
                const char *space_pos = strchr (full, ' ');
                if (space_pos)
                {
                    m_class.SetCStringWithLength (class_start, space_pos - class_start);
                    if (!m_class_category)
                    {
                        // No category in name, so we can also fill in the m_class_category
                        m_class_category = m_class;
                    }
                }
            }
        }
    }
    return m_class;
}

const ConstString &
ObjCLanguage::MethodName::GetClassNameWithCategory () 
{
    if (!m_class_category)
    {
        if (IsValid(false))
        {
            const char *full = m_full.GetCString();
            const char *class_start = (full[0] == '[' ? full + 1 : full + 2);
            const char *space_pos = strchr (full, ' ');
            if (space_pos)
            {
                m_class_category.SetCStringWithLength (class_start, space_pos - class_start);
                // If m_class hasn't been filled in and the class with category doesn't
                // contain a '(', then we can also fill in the m_class
                if (!m_class && strchr(m_class_category.GetCString(), '(') == nullptr)
                {
                    m_class = m_class_category;
                    // No '(' was found in the full name, we can definitively say
                    // that our category was valid (and empty).
                    m_category_is_valid = true;

                }
            }
        }
    }
    return m_class_category;
}

const ConstString &
ObjCLanguage::MethodName::GetSelector ()
{
    if (!m_selector)
    {
        if (IsValid(false))
        {
            const char *full = m_full.GetCString();
            const char *space_pos = strchr (full, ' ');
            if (space_pos)
            {
                ++space_pos; // skip the space
                m_selector.SetCStringWithLength (space_pos, m_full.GetLength() - (space_pos - full) - 1);
            }
        }
    }
    return m_selector;
}

const ConstString &
ObjCLanguage::MethodName::GetCategory ()
{
    if (!m_category_is_valid && !m_category)
    {
        if (IsValid(false))
        {
            m_category_is_valid = true;
            const char *full = m_full.GetCString();
            const char *class_start = (full[0] == '[' ? full + 1 : full + 2);
            const char *open_paren_pos = strchr (class_start, '(');
            if (open_paren_pos)
            {
                ++open_paren_pos; // Skip the open paren
                const char *close_paren_pos = strchr (open_paren_pos, ')');
                if (close_paren_pos)
                    m_category.SetCStringWithLength (open_paren_pos, close_paren_pos - open_paren_pos);
            }
        }
    }
    return m_category;
}

ConstString
ObjCLanguage::MethodName::GetFullNameWithoutCategory (bool empty_if_no_category)
{
    if (IsValid(false))
    {
        if (HasCategory())
        {
            StreamString strm;
            if (m_type == eTypeClassMethod)
                strm.PutChar('+');
            else if (m_type == eTypeInstanceMethod)
                strm.PutChar('-');
            strm.Printf("[%s %s]", GetClassName().GetCString(), GetSelector().GetCString());
            return ConstString(strm.GetString().c_str());
        }
        
        if (!empty_if_no_category)
        {
            // Just return the full name since it doesn't have a category
            return GetFullName();
        }
    }
    return ConstString();
}

size_t
ObjCLanguage::MethodName::GetFullNames (std::vector<ConstString> &names, bool append)
{
    if (!append)
        names.clear();
    if (IsValid(false))
    {
        StreamString strm;
        const bool is_class_method = m_type == eTypeClassMethod;
        const bool is_instance_method = m_type == eTypeInstanceMethod;
        const ConstString &category = GetCategory();
        if (is_class_method || is_instance_method)
        {
            names.push_back (m_full);
            if (category)
            {
                strm.Printf("%c[%s %s]",
                            is_class_method ? '+' : '-',
                            GetClassName().GetCString(),
                            GetSelector().GetCString());
                names.push_back(ConstString(strm.GetString().c_str()));
            }
        }
        else
        {
            const ConstString &class_name = GetClassName();
            const ConstString &selector = GetSelector();
            strm.Printf("+[%s %s]", class_name.GetCString(), selector.GetCString());
            names.push_back(ConstString(strm.GetString().c_str()));
            strm.Clear();
            strm.Printf("-[%s %s]", class_name.GetCString(), selector.GetCString());
            names.push_back(ConstString(strm.GetString().c_str()));
            strm.Clear();
            if (category)
            {
                strm.Printf("+[%s(%s) %s]", class_name.GetCString(), category.GetCString(), selector.GetCString());
                names.push_back(ConstString(strm.GetString().c_str()));
                strm.Clear();
                strm.Printf("-[%s(%s) %s]", class_name.GetCString(), category.GetCString(), selector.GetCString());
                names.push_back(ConstString(strm.GetString().c_str()));
            }
        }
    }
    return names.size();
}

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->GetTypeSummariesContainer()->Add(ConstString("BOOL"),
                                                       ObjC_BOOL_summary);
    objc_category_sp->GetTypeSummariesContainer()->Add(ConstString("BOOL &"),
                                                       ObjC_BOOL_summary);
    objc_category_sp->GetTypeSummariesContainer()->Add(ConstString("BOOL *"),
                                                       ObjC_BOOL_summary);
    
#ifndef LLDB_DISABLE_PYTHON
    // 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", ConstString("SEL"), objc_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::ObjCSELSummaryProvider<false>, "SEL summary provider", ConstString("struct objc_selector"), objc_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::ObjCSELSummaryProvider<false>, "SEL summary provider", ConstString("objc_selector"), objc_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::ObjCSELSummaryProvider<true>, "SEL summary provider", ConstString("objc_selector *"), objc_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::ObjCSELSummaryProvider<true>, "SEL summary provider", ConstString("SEL *"), objc_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::ObjCClassSummaryProvider, "Class summary provider", ConstString("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", ConstString("Class"), class_synth_flags);
#endif // LLDB_DISABLE_PYTHON
    
    objc_flags.SetSkipPointers(false);
    objc_flags.SetCascades(true);
    objc_flags.SetSkipReferences(false);
    
    AddStringSummary (objc_category_sp,
                      "${var.__FuncPtr%A}",
                      ConstString("__block_literal_generic"),
                      objc_flags);
    
    AddStringSummary(objc_category_sp,
                     "${var.years} years, ${var.months} months, ${var.days} days, ${var.hours} hours, ${var.minutes} minutes ${var.seconds} seconds",
                     ConstString("CFGregorianUnits"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "location=${var.location} length=${var.length}",
                     ConstString("CFRange"),
                     objc_flags);
    
    AddStringSummary(objc_category_sp,
                     "location=${var.location}, length=${var.length}",
                     ConstString("NSRange"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "(${var.origin}, ${var.size}), ...",
                     ConstString("NSRectArray"),
                     objc_flags);
    
    AddOneLineSummary (objc_category_sp,
                       ConstString("NSPoint"),
                       objc_flags);
    AddOneLineSummary (objc_category_sp,
                       ConstString("NSSize"),
                       objc_flags);
    AddOneLineSummary (objc_category_sp,
                       ConstString("NSRect"),
                       objc_flags);
    
    AddOneLineSummary (objc_category_sp,
                       ConstString("CGSize"),
                       objc_flags);
    AddOneLineSummary (objc_category_sp,
                       ConstString("CGPoint"),
                       objc_flags);
    AddOneLineSummary (objc_category_sp,
                       ConstString("CGRect"),
                       objc_flags);
    
    AddStringSummary(objc_category_sp,
                     "red=${var.red} green=${var.green} blue=${var.blue}",
                     ConstString("RGBColor"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "(t=${var.top}, l=${var.left}, b=${var.bottom}, r=${var.right})",
                     ConstString("Rect"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "{(v=${var.v}, h=${var.h})}",
                     ConstString("Point"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "${var.month}/${var.day}/${var.year}  ${var.hour} :${var.minute} :${var.second} dayOfWeek:${var.dayOfWeek}",
                     ConstString("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}",
                     ConstString("LongDateRect"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "(x=${var.x}, y=${var.y})",
                     ConstString("HIPoint"),
                     objc_flags);
    AddStringSummary(objc_category_sp,
                     "origin=${var.origin} size=${var.size}",
                     ConstString("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);
    
#ifndef LLDB_DISABLE_PYTHON
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("NSArray"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("NSMutableArray"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("__NSArrayI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("__NSArray0"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("__NSSingleObjectArrayI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("__NSArrayM"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("__NSCFArray"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("CFArrayRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSArraySummaryProvider, "NSArray summary provider", ConstString("CFMutableArrayRef"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("NSDictionary"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("NSMutableDictionary"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("__NSCFDictionary"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("__NSDictionaryI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("__NSSingleEntryDictionaryI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<false>, "NSDictionary summary provider", ConstString("__NSDictionaryM"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<true>, "NSDictionary summary provider", ConstString("CFDictionaryRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDictionarySummaryProvider<true>, "NSDictionary summary provider", ConstString("CFMutableDictionaryRef"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "NSSet summary", ConstString("NSSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "NSMutableSet summary", ConstString("NSMutableSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<true>, "CFSetRef summary", ConstString("CFSetRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<true>, "CFMutableSetRef summary", ConstString("CFMutableSetRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "__NSCFSet summary", ConstString("__NSCFSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "__NSSetI summary", ConstString("__NSSetI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "__NSSetM summary", ConstString("__NSSetM"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "NSCountedSet summary", ConstString("NSCountedSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "NSMutableSet summary", ConstString("NSMutableSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "NSOrderedSet summary", ConstString("NSOrderedSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "__NSOrderedSetI summary", ConstString("__NSOrderedSetI"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSSetSummaryProvider<false>, "__NSOrderedSetM summary", ConstString("__NSOrderedSetM"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSError_SummaryProvider, "NSError summary provider", ConstString("NSError"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSException_SummaryProvider, "NSException summary provider", ConstString("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", ConstString("__NSArrayM"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("__NSArrayI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("__NSArray0"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("__NSSingleObjectArrayI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("NSArray"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("NSMutableArray"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("__NSCFArray"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("CFMutableArrayRef"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSArraySyntheticFrontEndCreator, "NSArray synthetic children", ConstString("CFArrayRef"), ScriptedSyntheticChildren::Flags());
    
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("__NSDictionaryM"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("__NSDictionaryI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("__NSSingleEntryDictionaryI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("__NSCFDictionary"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("NSDictionary"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("NSMutableDictionary"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("CFDictionaryRef"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSDictionarySyntheticFrontEndCreator, "NSDictionary synthetic children", ConstString("CFMutableDictionaryRef"), ScriptedSyntheticChildren::Flags());
    
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSErrorSyntheticFrontEndCreator, "NSError synthetic children", ConstString("NSError"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSExceptionSyntheticFrontEndCreator, "NSException synthetic children", ConstString("NSException"), ScriptedSyntheticChildren::Flags());
    
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "NSSet synthetic children", ConstString("NSSet"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "__NSSetI synthetic children", ConstString("__NSSetI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "__NSSetM synthetic children", ConstString("__NSSetM"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "NSMutableSet synthetic children", ConstString("NSMutableSet"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "NSOrderedSet synthetic children", ConstString("NSOrderedSet"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "__NSOrderedSetI synthetic children", ConstString("__NSOrderedSetI"), ScriptedSyntheticChildren::Flags());
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSSetSyntheticFrontEndCreator, "__NSOrderedSetM synthetic children", ConstString("__NSOrderedSetM"), ScriptedSyntheticChildren::Flags());
    
    AddCXXSynthetic(objc_category_sp, lldb_private::formatters::NSIndexPathSyntheticFrontEndCreator, "NSIndexPath synthetic children", ConstString("NSIndexPath"), ScriptedSyntheticChildren::Flags());
    
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBagSummaryProvider, "CFBag summary provider", ConstString("CFBagRef"), appkit_flags);
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBagSummaryProvider, "CFBag summary provider", ConstString("__CFBag"), appkit_flags);
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBagSummaryProvider, "CFBag summary provider", ConstString("const struct __CFBag"), appkit_flags);
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBagSummaryProvider, "CFBag summary provider", ConstString("CFMutableBagRef"), appkit_flags);
    
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBinaryHeapSummaryProvider, "CFBinaryHeap summary provider", ConstString("CFBinaryHeapRef"), appkit_flags);
    AddCXXSummary(objc_category_sp,lldb_private::formatters::CFBinaryHeapSummaryProvider, "CFBinaryHeap summary provider", ConstString("__CFBinaryHeap"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("NSString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("CFStringRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("__CFString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("CFMutableStringRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("NSMutableString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("__NSCFConstantString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("__NSCFString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("NSCFConstantString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("NSCFString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSStringSummaryProvider, "NSString summary provider", ConstString("NSPathStore2"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSAttributedStringSummaryProvider, "NSAttributedString summary provider", ConstString("NSAttributedString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSMutableAttributedStringSummaryProvider, "NSMutableAttributedString summary provider", ConstString("NSMutableAttributedString"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSMutableAttributedStringSummaryProvider, "NSMutableAttributedString summary provider", ConstString("NSConcreteMutableAttributedString"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSBundleSummaryProvider, "NSBundle summary provider", ConstString("NSBundle"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("NSData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("_NSInlineData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("NSConcreteData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("NSConcreteMutableData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("NSMutableData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<false>, "NSData summary provider", ConstString("__NSCFData"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<true>, "NSData summary provider", ConstString("CFDataRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDataSummaryProvider<true>, "NSData summary provider", ConstString("CFMutableDataRef"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSMachPortSummaryProvider, "NSMachPort summary provider", ConstString("NSMachPort"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNotificationSummaryProvider, "NSNotification summary provider", ConstString("NSNotification"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNotificationSummaryProvider, "NSNotification summary provider", ConstString("NSConcreteNotification"), appkit_flags);
        
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "NSNumber summary provider", ConstString("NSNumber"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "CFNumberRef summary provider", ConstString("CFNumberRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "NSNumber summary provider", ConstString("__NSCFBoolean"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "NSNumber summary provider", ConstString("__NSCFNumber"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "NSNumber summary provider", ConstString("NSCFBoolean"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSNumberSummaryProvider, "NSNumber summary provider", ConstString("NSCFNumber"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSURLSummaryProvider, "NSURL summary provider", ConstString("NSURL"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSURLSummaryProvider, "NSURL summary provider", ConstString("CFURLRef"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDateSummaryProvider, "NSDate summary provider", ConstString("NSDate"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDateSummaryProvider, "NSDate summary provider", ConstString("__NSDate"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDateSummaryProvider, "NSDate summary provider", ConstString("__NSTaggedDate"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSDateSummaryProvider, "NSDate summary provider", ConstString("NSCalendarDate"), appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSTimeZoneSummaryProvider, "NSTimeZone summary provider", ConstString("NSTimeZone"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSTimeZoneSummaryProvider, "NSTimeZone summary provider", ConstString("CFTimeZoneRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSTimeZoneSummaryProvider, "NSTimeZone summary provider", ConstString("__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", ConstString("CFAbsoluteTime"), appkit_flags);
    appkit_flags.SetDontShowValue(false);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSIndexSetSummaryProvider, "NSIndexSet summary provider", ConstString("NSIndexSet"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::NSIndexSetSummaryProvider, "NSIndexSet summary provider", ConstString("NSMutableIndexSet"), appkit_flags);
    
    AddStringSummary(objc_category_sp,
                     "@\"${var.month%d}/${var.day%d}/${var.year%d} ${var.hour%d}:${var.minute%d}:${var.second}\"",
                     ConstString("CFGregorianDate"),
                     appkit_flags);
    
    AddCXXSummary(objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider, "CFBitVector summary provider", ConstString("CFBitVectorRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider, "CFBitVector summary provider", ConstString("CFMutableBitVectorRef"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider, "CFBitVector summary provider", ConstString("__CFBitVector"), appkit_flags);
    AddCXXSummary(objc_category_sp, lldb_private::formatters::CFBitVectorSummaryProvider, "CFBitVector summary provider", ConstString("__CFMutableBitVector"), appkit_flags);
#endif // LLDB_DISABLE_PYTHON
}

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);
    
#ifndef LLDB_DISABLE_PYTHON
    AddCXXSummary(objc_category_sp, lldb_private::formatters::CMTimeSummaryProvider, "CMTime summary provider", ConstString("CMTime"), cm_flags);
#endif // LLDB_DISABLE_PYTHON
}

lldb::TypeCategoryImplSP
ObjCLanguage::GetFormatters ()
{
    static std::once_flag g_initialize;
    static TypeCategoryImplSP g_category;
    
    std::call_once(g_initialize, [this] () -> void {
        DataVisualization::Categories::GetCategory(GetPluginName(), g_category);
        if (g_category)
        {
            LoadCoreMediaFormatters(g_category);
            LoadObjCFormatters(g_category);
        }
    });
    return g_category;
}

std::vector<ConstString>
ObjCLanguage::GetPossibleFormattersMatches (ValueObject& valobj, lldb::DynamicValueType use_dynamic)
{
    std::vector<ConstString> 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)
    {
        do {
            lldb::ProcessSP process_sp = valobj.GetProcessSP();
            if (!process_sp)
                break;
            ObjCLanguageRuntime* runtime = process_sp->GetObjCLanguageRuntime();
            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);
        } while (false);
    }
    
    return result;
}

std::unique_ptr<Language::TypeScavenger>
ObjCLanguage::GetTypeScavenger ()
{
    class ObjCTypeScavenger : public Language::TypeScavenger
    {
    private:
        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;
            }

            ~ObjCScavengerResult() override = default;

        private:
            CompilerType m_compiler_type;
        };
        
    protected:
        ObjCTypeScavenger() = default;
        
        ~ObjCTypeScavenger() override = default;
        
        bool
        Find_Impl (ExecutionContextScope *exe_scope,
                   const char *key,
                   ResultSet &results) override
        {
            bool result = false;
            
            Target* target = exe_scope->CalculateTarget().get();
            if (target)
            {
                if (auto clang_modules_decl_vendor = target->GetClangModulesDeclVendor())
                {
                    std::vector <clang::NamedDecl*> decls;
                    ConstString key_cs(key);
                    
                    if (clang_modules_decl_vendor->FindDecls(key_cs, false, UINT32_MAX, decls) > 0 &&
                        !decls.empty())
                    {
                        CompilerType module_type = ClangASTContext::GetTypeForDecl(decls.front());
                        result = true;
                        std::unique_ptr<Language::TypeScavenger::Result> result(new ObjCScavengerResult(module_type));
                        results.insert(std::move(result));
                    }
                }
            }
            
            if (!result)
            {
                Process* process = exe_scope->CalculateProcess().get();
                if (process)
                {
                    const bool create_on_demand = false;
                    auto objc_runtime = process->GetObjCLanguageRuntime(create_on_demand);
                    if (objc_runtime)
                    {
                        auto decl_vendor = objc_runtime->GetDeclVendor();
                        if (decl_vendor)
                        {
                            std::vector<clang::NamedDecl *> decls;
                            ConstString name(key);
                            decl_vendor->FindDecls(name, true, UINT32_MAX, decls);
                            for (auto decl : decls)
                            {
                                if (decl)
                                {
                                    if (CompilerType candidate = ClangASTContext::GetTypeForDecl(decl))
                                    {
                                        result = true;
                                        std::unique_ptr<Language::TypeScavenger::Result> result(new ObjCScavengerResult(candidate));
                                        results.insert(std::move(result));
                                    }
                                }
                            }
                        }
                    }
                }
            }

            return result;
        }

        friend class lldb_private::ObjCLanguage;
    };
    
    return std::unique_ptr<TypeScavenger>(new ObjCTypeScavenger());
}

bool
ObjCLanguage::GetFormatterPrefixSuffix (ValueObject& valobj, ConstString type_hint,
                                        std::string& prefix, std::string& suffix)
{
    static ConstString g_CFBag("CFBag");
    static ConstString g_CFBinaryHeap("CFBinaryHeap");
    
    static ConstString g_NSNumberChar("NSNumber:char");
    static ConstString g_NSNumberShort("NSNumber:short");
    static ConstString g_NSNumberInt("NSNumber:int");
    static ConstString g_NSNumberLong("NSNumber:long");
    static ConstString g_NSNumberFloat("NSNumber:float");
    static ConstString g_NSNumberDouble("NSNumber:double");
    
    static ConstString g_NSData("NSData");
    static ConstString g_NSArray("NSArray");
    static ConstString g_NSString("NSString");
    static ConstString g_NSStringStar("NSString*");
    
    if (type_hint.IsEmpty())
        return false;
    
    prefix.clear();
    suffix.clear();
    
    if (type_hint == g_CFBag ||
        type_hint == g_CFBinaryHeap)
    {
        prefix = "@";
        return true;
    }
    
    if (type_hint == g_NSNumberChar)
    {
        prefix = "(char)";
        return true;
    }
    if (type_hint == g_NSNumberShort)
    {
        prefix = "(short)";
        return true;
    }
    if (type_hint == g_NSNumberInt)
    {
        prefix = "(int)";
        return true;
    }
    if (type_hint == g_NSNumberLong)
    {
        prefix = "(long)";
        return true;
    }
    if (type_hint == g_NSNumberFloat)
    {
        prefix = "(float)";
        return true;
    }
    if (type_hint == g_NSNumberDouble)
    {
        prefix = "(double)";
        return true;
    }
    
    if (type_hint == g_NSData ||
        type_hint == g_NSArray)
    {
        prefix = "@\"";
        suffix = "\"";
        return true;
    }
    
    if (type_hint == g_NSString ||
        type_hint == g_NSStringStar)
    {
        prefix = "@";
        return true;
    }
    
    return false;
}

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;
}