xref: /llvm-project-15.0.7/lldb/source/Core/Module.cpp (revision 57bee1ed)

//===-- Module.cpp ----------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/Core/AddressResolverFileLine.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/DataBuffer.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/Symbols.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/ScriptInterpreter.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/GoASTContext.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/Target.h"
#include "lldb/Symbol/SymbolFile.h"
#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
#include "Plugins/Language/ObjC/ObjCLanguage.h"

#include "Plugins/ObjectFile/JIT/ObjectFileJIT.h"

#include "llvm/Support/raw_os_ostream.h"
#include "llvm/Support/Signals.h"

using namespace lldb;
using namespace lldb_private;

// Shared pointers to modules track module lifetimes in
// targets and in the global module, but this collection
// will track all module objects that are still alive
typedef std::vector<Module *> ModuleCollection;

static ModuleCollection &
GetModuleCollection()
{
    // This module collection needs to live past any module, so we could either make it a
    // shared pointer in each module or just leak is.  Since it is only an empty vector by
    // the time all the modules have gone away, we just leak it for now.  If we decide this
    // is a big problem we can introduce a Finalize method that will tear everything down in
    // a predictable order.

    static ModuleCollection *g_module_collection = NULL;
    if (g_module_collection == NULL)
        g_module_collection = new ModuleCollection();

    return *g_module_collection;
}

Mutex *
Module::GetAllocationModuleCollectionMutex()
{
    // NOTE: The mutex below must be leaked since the global module list in
    // the ModuleList class will get torn at some point, and we can't know
    // if it will tear itself down before the "g_module_collection_mutex" below
    // will. So we leak a Mutex object below to safeguard against that

    static Mutex *g_module_collection_mutex = NULL;
    if (g_module_collection_mutex == NULL)
        g_module_collection_mutex = new Mutex (Mutex::eMutexTypeRecursive); // NOTE: known leak
    return g_module_collection_mutex;
}

size_t
Module::GetNumberAllocatedModules ()
{
    Mutex::Locker locker (GetAllocationModuleCollectionMutex());
    return GetModuleCollection().size();
}

Module *
Module::GetAllocatedModuleAtIndex (size_t idx)
{
    Mutex::Locker locker (GetAllocationModuleCollectionMutex());
    ModuleCollection &modules = GetModuleCollection();
    if (idx < modules.size())
        return modules[idx];
    return NULL;
}
#if 0

// These functions help us to determine if modules are still loaded, yet don't require that
// you have a command interpreter and can easily be called from an external debugger.
namespace lldb {

    void
    ClearModuleInfo (void)
    {
        const bool mandatory = true;
        ModuleList::RemoveOrphanSharedModules(mandatory);
    }

    void
    DumpModuleInfo (void)
    {
        Mutex::Locker locker (Module::GetAllocationModuleCollectionMutex());
        ModuleCollection &modules = GetModuleCollection();
        const size_t count = modules.size();
        printf ("%s: %" PRIu64 " modules:\n", __PRETTY_FUNCTION__, (uint64_t)count);
        for (size_t i=0; i<count; ++i)
        {

            StreamString strm;
            Module *module = modules[i];
            const bool in_shared_module_list = ModuleList::ModuleIsInCache (module);
            module->GetDescription(&strm, eDescriptionLevelFull);
            printf ("%p: shared = %i, ref_count = %3u, module = %s\n",
                    module,
                    in_shared_module_list,
                    (uint32_t)module->use_count(),
                    strm.GetString().c_str());
        }
    }
}

#endif

Module::Module (const ModuleSpec &module_spec) :
    m_mutex (Mutex::eMutexTypeRecursive),
    m_mod_time (),
    m_arch (),
    m_uuid (),
    m_file (),
    m_platform_file(),
    m_remote_install_file(),
    m_symfile_spec (),
    m_object_name (),
    m_object_offset (),
    m_object_mod_time (),
    m_objfile_sp (),
    m_symfile_ap (),
    m_ast (new ClangASTContext),
    m_go_ast(),
    m_source_mappings (),
    m_sections_ap(),
    m_did_load_objfile (false),
    m_did_load_symbol_vendor (false),
    m_did_parse_uuid (false),
    m_did_init_ast (false),
    m_file_has_changed (false),
    m_first_file_changed_log (false)
{
    // Scope for locker below...
    {
        Mutex::Locker locker (GetAllocationModuleCollectionMutex());
        GetModuleCollection().push_back(this);
    }

    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_OBJECT|LIBLLDB_LOG_MODULES));
    if (log)
        log->Printf ("%p Module::Module((%s) '%s%s%s%s')",
                     static_cast<void*>(this),
                     module_spec.GetArchitecture().GetArchitectureName(),
                     module_spec.GetFileSpec().GetPath().c_str(),
                     module_spec.GetObjectName().IsEmpty() ? "" : "(",
                     module_spec.GetObjectName().IsEmpty() ? "" : module_spec.GetObjectName().AsCString(""),
                     module_spec.GetObjectName().IsEmpty() ? "" : ")");

    // First extract all module specifications from the file using the local
    // file path. If there are no specifications, then don't fill anything in
    ModuleSpecList modules_specs;
    if (ObjectFile::GetModuleSpecifications(module_spec.GetFileSpec(), 0, 0, modules_specs) == 0)
        return;

    // Now make sure that one of the module specifications matches what we just
    // extract. We might have a module specification that specifies a file "/usr/lib/dyld"
    // with UUID XXX, but we might have a local version of "/usr/lib/dyld" that has
    // UUID YYY and we don't want those to match. If they don't match, just don't
    // fill any ivars in so we don't accidentally grab the wrong file later since
    // they don't match...
    ModuleSpec matching_module_spec;
    if (modules_specs.FindMatchingModuleSpec(module_spec, matching_module_spec) == 0)
        return;

    if (module_spec.GetFileSpec())
        m_mod_time = module_spec.GetFileSpec().GetModificationTime();
    else if (matching_module_spec.GetFileSpec())
        m_mod_time = matching_module_spec.GetFileSpec().GetModificationTime();

    // Copy the architecture from the actual spec if we got one back, else use the one that was specified
    if (matching_module_spec.GetArchitecture().IsValid())
        m_arch = matching_module_spec.GetArchitecture();
    else if (module_spec.GetArchitecture().IsValid())
        m_arch = module_spec.GetArchitecture();

    // Copy the file spec over and use the specified one (if there was one) so we
    // don't use a path that might have gotten resolved a path in 'matching_module_spec'
    if (module_spec.GetFileSpec())
        m_file = module_spec.GetFileSpec();
    else if (matching_module_spec.GetFileSpec())
        m_file = matching_module_spec.GetFileSpec();

    // Copy the platform file spec over
    if (module_spec.GetPlatformFileSpec())
        m_platform_file = module_spec.GetPlatformFileSpec();
    else if (matching_module_spec.GetPlatformFileSpec())
        m_platform_file = matching_module_spec.GetPlatformFileSpec();

    // Copy the symbol file spec over
    if (module_spec.GetSymbolFileSpec())
        m_symfile_spec = module_spec.GetSymbolFileSpec();
    else if (matching_module_spec.GetSymbolFileSpec())
        m_symfile_spec = matching_module_spec.GetSymbolFileSpec();

    // Copy the object name over
    if (matching_module_spec.GetObjectName())
        m_object_name = matching_module_spec.GetObjectName();
    else
        m_object_name = module_spec.GetObjectName();

    // Always trust the object offset (file offset) and object modification
    // time (for mod time in a BSD static archive) of from the matching
    // module specification
    m_object_offset = matching_module_spec.GetObjectOffset();
    m_object_mod_time = matching_module_spec.GetObjectModificationTime();

}

Module::Module(const FileSpec& file_spec,
               const ArchSpec& arch,
               const ConstString *object_name,
               lldb::offset_t object_offset,
               const TimeValue *object_mod_time_ptr) :
    m_mutex (Mutex::eMutexTypeRecursive),
    m_mod_time (file_spec.GetModificationTime()),
    m_arch (arch),
    m_uuid (),
    m_file (file_spec),
    m_platform_file(),
    m_remote_install_file (),
    m_symfile_spec (),
    m_object_name (),
    m_object_offset (object_offset),
    m_object_mod_time (),
    m_objfile_sp (),
    m_symfile_ap (),
    m_ast (new ClangASTContext),
    m_go_ast(),
    m_source_mappings (),
    m_sections_ap(),
    m_did_load_objfile (false),
    m_did_load_symbol_vendor (false),
    m_did_parse_uuid (false),
    m_did_init_ast (false),
    m_file_has_changed (false),
    m_first_file_changed_log (false)
{
    // Scope for locker below...
    {
        Mutex::Locker locker (GetAllocationModuleCollectionMutex());
        GetModuleCollection().push_back(this);
    }

    if (object_name)
        m_object_name = *object_name;

    if (object_mod_time_ptr)
        m_object_mod_time = *object_mod_time_ptr;

    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_OBJECT|LIBLLDB_LOG_MODULES));
    if (log)
        log->Printf ("%p Module::Module((%s) '%s%s%s%s')",
                     static_cast<void*>(this), m_arch.GetArchitectureName(),
                     m_file.GetPath().c_str(),
                     m_object_name.IsEmpty() ? "" : "(",
                     m_object_name.IsEmpty() ? "" : m_object_name.AsCString(""),
                     m_object_name.IsEmpty() ? "" : ")");
}

Module::Module () :
    m_mutex (Mutex::eMutexTypeRecursive),
    m_mod_time (),
    m_arch (),
    m_uuid (),
    m_file (),
    m_platform_file(),
    m_remote_install_file (),
    m_symfile_spec (),
    m_object_name (),
    m_object_offset (0),
    m_object_mod_time (),
    m_objfile_sp (),
    m_symfile_ap (),
    m_ast (new ClangASTContext),
    m_go_ast(),
    m_source_mappings (),
    m_sections_ap(),
    m_did_load_objfile (false),
    m_did_load_symbol_vendor (false),
    m_did_parse_uuid (false),
    m_did_init_ast (false),
    m_file_has_changed (false),
    m_first_file_changed_log (false)
{
    Mutex::Locker locker (GetAllocationModuleCollectionMutex());
    GetModuleCollection().push_back(this);
}

Module::~Module()
{
    // Lock our module down while we tear everything down to make sure
    // we don't get any access to the module while it is being destroyed
    Mutex::Locker locker (m_mutex);
    // Scope for locker below...
    {
        Mutex::Locker locker (GetAllocationModuleCollectionMutex());
        ModuleCollection &modules = GetModuleCollection();
        ModuleCollection::iterator end = modules.end();
        ModuleCollection::iterator pos = std::find(modules.begin(), end, this);
        assert (pos != end);
        modules.erase(pos);
    }
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_OBJECT|LIBLLDB_LOG_MODULES));
    if (log)
        log->Printf ("%p Module::~Module((%s) '%s%s%s%s')",
                     static_cast<void*>(this),
                     m_arch.GetArchitectureName(),
                     m_file.GetPath().c_str(),
                     m_object_name.IsEmpty() ? "" : "(",
                     m_object_name.IsEmpty() ? "" : m_object_name.AsCString(""),
                     m_object_name.IsEmpty() ? "" : ")");
    // Release any auto pointers before we start tearing down our member
    // variables since the object file and symbol files might need to make
    // function calls back into this module object. The ordering is important
    // here because symbol files can require the module object file. So we tear
    // down the symbol file first, then the object file.
    m_sections_ap.reset();
    m_symfile_ap.reset();
    m_objfile_sp.reset();
}

ObjectFile *
Module::GetMemoryObjectFile (const lldb::ProcessSP &process_sp, lldb::addr_t header_addr, Error &error, size_t size_to_read)
{
    if (m_objfile_sp)
    {
        error.SetErrorString ("object file already exists");
    }
    else
    {
        Mutex::Locker locker (m_mutex);
        if (process_sp)
        {
            m_did_load_objfile = true;
            std::unique_ptr<DataBufferHeap> data_ap (new DataBufferHeap (size_to_read, 0));
            Error readmem_error;
            const size_t bytes_read = process_sp->ReadMemory (header_addr,
                                                              data_ap->GetBytes(),
                                                              data_ap->GetByteSize(),
                                                              readmem_error);
            if (bytes_read == size_to_read)
            {
                DataBufferSP data_sp(data_ap.release());
                m_objfile_sp = ObjectFile::FindPlugin(shared_from_this(), process_sp, header_addr, data_sp);
                if (m_objfile_sp)
                {
                    StreamString s;
                    s.Printf("0x%16.16" PRIx64, header_addr);
                    m_object_name.SetCString (s.GetData());

                    // Once we get the object file, update our module with the object file's
                    // architecture since it might differ in vendor/os if some parts were
                    // unknown.
                    m_objfile_sp->GetArchitecture (m_arch);
                }
                else
                {
                    error.SetErrorString ("unable to find suitable object file plug-in");
                }
            }
            else
            {
                error.SetErrorStringWithFormat ("unable to read header from memory: %s", readmem_error.AsCString());
            }
        }
        else
        {
            error.SetErrorString ("invalid process");
        }
    }
    return m_objfile_sp.get();
}


const lldb_private::UUID&
Module::GetUUID()
{
    if (m_did_parse_uuid.load() == false)
    {
        Mutex::Locker locker (m_mutex);
        if (m_did_parse_uuid.load() == false)
        {
            ObjectFile * obj_file = GetObjectFile ();

            if (obj_file != NULL)
            {
                obj_file->GetUUID(&m_uuid);
                m_did_parse_uuid = true;
            }
        }
    }
    return m_uuid;
}

TypeSystem *
Module::GetTypeSystemForLanguage (LanguageType language)
{
    if (language == eLanguageTypeGo)
    {
        Mutex::Locker locker (m_mutex);
        if (!m_go_ast)
        {
            ObjectFile * objfile = GetObjectFile();
            ArchSpec object_arch;
            if (objfile && objfile->GetArchitecture(object_arch))
            {
                m_go_ast.reset(new GoASTContext);
                m_go_ast->SetAddressByteSize(object_arch.GetAddressByteSize());
            }
        }
        return m_go_ast.get();
    }
    else if (language != eLanguageTypeSwift)
    {
        // For now assume all languages except swift use the ClangASTContext for types
        return &GetClangASTContext();
    }
    return nullptr;
}

ClangASTContext &
Module::GetClangASTContext ()
{
    if (m_did_init_ast.load() == false)
    {
        Mutex::Locker locker (m_mutex);
        if (m_did_init_ast.load() == false)
        {
            ObjectFile * objfile = GetObjectFile();
            ArchSpec object_arch;
            if (objfile && objfile->GetArchitecture(object_arch))
            {
                m_did_init_ast = true;

                // LLVM wants this to be set to iOS or MacOSX; if we're working on
                // a bare-boards type image, change the triple for llvm's benefit.
                if (object_arch.GetTriple().getVendor() == llvm::Triple::Apple
                    && object_arch.GetTriple().getOS() == llvm::Triple::UnknownOS)
                {
                    if (object_arch.GetTriple().getArch() == llvm::Triple::arm ||
                        object_arch.GetTriple().getArch() == llvm::Triple::aarch64 ||
                        object_arch.GetTriple().getArch() == llvm::Triple::thumb)
                    {
                        object_arch.GetTriple().setOS(llvm::Triple::IOS);
                    }
                    else
                    {
                        object_arch.GetTriple().setOS(llvm::Triple::MacOSX);
                    }
                }
                m_ast->SetArchitecture (object_arch);
            }
        }
    }
    return *m_ast;
}

void
Module::ParseAllDebugSymbols()
{
    Mutex::Locker locker (m_mutex);
    size_t num_comp_units = GetNumCompileUnits();
    if (num_comp_units == 0)
        return;

    SymbolContext sc;
    sc.module_sp = shared_from_this();
    SymbolVendor *symbols = GetSymbolVendor ();

    for (size_t cu_idx = 0; cu_idx < num_comp_units; cu_idx++)
    {
        sc.comp_unit = symbols->GetCompileUnitAtIndex(cu_idx).get();
        if (sc.comp_unit)
        {
            sc.function = NULL;
            symbols->ParseVariablesForContext(sc);

            symbols->ParseCompileUnitFunctions(sc);

            for (size_t func_idx = 0; (sc.function = sc.comp_unit->GetFunctionAtIndex(func_idx).get()) != NULL; ++func_idx)
            {
                symbols->ParseFunctionBlocks(sc);

                // Parse the variables for this function and all its blocks
                symbols->ParseVariablesForContext(sc);
            }


            // Parse all types for this compile unit
            sc.function = NULL;
            symbols->ParseTypes(sc);
        }
    }
}

void
Module::CalculateSymbolContext(SymbolContext* sc)
{
    sc->module_sp = shared_from_this();
}

ModuleSP
Module::CalculateSymbolContextModule ()
{
    return shared_from_this();
}

void
Module::DumpSymbolContext(Stream *s)
{
    s->Printf(", Module{%p}", static_cast<void*>(this));
}

size_t
Module::GetNumCompileUnits()
{
    Mutex::Locker locker (m_mutex);
    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::GetNumCompileUnits (module = %p)",
                       static_cast<void*>(this));
    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
        return symbols->GetNumCompileUnits();
    return 0;
}

CompUnitSP
Module::GetCompileUnitAtIndex (size_t index)
{
    Mutex::Locker locker (m_mutex);
    size_t num_comp_units = GetNumCompileUnits ();
    CompUnitSP cu_sp;

    if (index < num_comp_units)
    {
        SymbolVendor *symbols = GetSymbolVendor ();
        if (symbols)
            cu_sp = symbols->GetCompileUnitAtIndex(index);
    }
    return cu_sp;
}

bool
Module::ResolveFileAddress (lldb::addr_t vm_addr, Address& so_addr)
{
    Mutex::Locker locker (m_mutex);
    Timer scoped_timer(__PRETTY_FUNCTION__, "Module::ResolveFileAddress (vm_addr = 0x%" PRIx64 ")", vm_addr);
    SectionList *section_list = GetSectionList();
    if (section_list)
        return so_addr.ResolveAddressUsingFileSections(vm_addr, section_list);
    return false;
}

uint32_t
Module::ResolveSymbolContextForAddress (const Address& so_addr, uint32_t resolve_scope, SymbolContext& sc,
                                        bool resolve_tail_call_address)
{
    Mutex::Locker locker (m_mutex);
    uint32_t resolved_flags = 0;

    // Clear the result symbol context in case we don't find anything, but don't clear the target
    sc.Clear(false);

    // Get the section from the section/offset address.
    SectionSP section_sp (so_addr.GetSection());

    // Make sure the section matches this module before we try and match anything
    if (section_sp && section_sp->GetModule().get() == this)
    {
        // If the section offset based address resolved itself, then this
        // is the right module.
        sc.module_sp = shared_from_this();
        resolved_flags |= eSymbolContextModule;

        SymbolVendor* sym_vendor = GetSymbolVendor();
        if (!sym_vendor)
            return resolved_flags;

        // Resolve the compile unit, function, block, line table or line
        // entry if requested.
        if (resolve_scope & eSymbolContextCompUnit    ||
            resolve_scope & eSymbolContextFunction    ||
            resolve_scope & eSymbolContextBlock       ||
            resolve_scope & eSymbolContextLineEntry   )
        {
            resolved_flags |= sym_vendor->ResolveSymbolContext (so_addr, resolve_scope, sc);
        }

        // Resolve the symbol if requested, but don't re-look it up if we've already found it.
        if (resolve_scope & eSymbolContextSymbol && !(resolved_flags & eSymbolContextSymbol))
        {
            Symtab *symtab = sym_vendor->GetSymtab();
            if (symtab && so_addr.IsSectionOffset())
            {
                sc.symbol = symtab->FindSymbolContainingFileAddress(so_addr.GetFileAddress());
                if (!sc.symbol &&
                    resolve_scope & eSymbolContextFunction && !(resolved_flags & eSymbolContextFunction))
                {
                    bool verify_unique = false; // No need to check again since ResolveSymbolContext failed to find a symbol at this address.
                    if (ObjectFile *obj_file = sc.module_sp->GetObjectFile())
                        sc.symbol = obj_file->ResolveSymbolForAddress(so_addr, verify_unique);
                }

                if (sc.symbol)
                {
                    if (sc.symbol->IsSynthetic())
                    {
                        // We have a synthetic symbol so lets check if the object file
                        // from the symbol file in the symbol vendor is different than
                        // the object file for the module, and if so search its symbol
                        // table to see if we can come up with a better symbol. For example
                        // dSYM files on MacOSX have an unstripped symbol table inside of
                        // them.
                        ObjectFile *symtab_objfile = symtab->GetObjectFile();
                        if (symtab_objfile && symtab_objfile->IsStripped())
                        {
                            SymbolFile *symfile = sym_vendor->GetSymbolFile();
                            if (symfile)
                            {
                                ObjectFile *symfile_objfile = symfile->GetObjectFile();
                                if (symfile_objfile != symtab_objfile)
                                {
                                    Symtab *symfile_symtab = symfile_objfile->GetSymtab();
                                    if (symfile_symtab)
                                    {
                                        Symbol *symbol = symfile_symtab->FindSymbolContainingFileAddress(so_addr.GetFileAddress());
                                        if (symbol && !symbol->IsSynthetic())
                                        {
                                            sc.symbol = symbol;
                                        }
                                    }
                                }
                            }
                        }
                    }
                    resolved_flags |= eSymbolContextSymbol;
                }
            }
        }

        // For function symbols, so_addr may be off by one.  This is a convention consistent
        // with FDE row indices in eh_frame sections, but requires extra logic here to permit
        // symbol lookup for disassembly and unwind.
        if (resolve_scope & eSymbolContextSymbol && !(resolved_flags & eSymbolContextSymbol) &&
            resolve_tail_call_address && so_addr.IsSectionOffset())
        {
            Address previous_addr = so_addr;
            previous_addr.Slide(-1);

            bool do_resolve_tail_call_address = false; // prevent recursion
            const uint32_t flags = ResolveSymbolContextForAddress(previous_addr, resolve_scope, sc,
                                                                  do_resolve_tail_call_address);
            if (flags & eSymbolContextSymbol)
            {
                AddressRange addr_range;
                if (sc.GetAddressRange (eSymbolContextFunction | eSymbolContextSymbol, 0, false, addr_range))
                {
                    if (addr_range.GetBaseAddress().GetSection() == so_addr.GetSection())
                    {
                        // If the requested address is one past the address range of a function (i.e. a tail call),
                        // or the decremented address is the start of a function (i.e. some forms of trampoline),
                        // indicate that the symbol has been resolved.
                        if (so_addr.GetOffset() == addr_range.GetBaseAddress().GetOffset() ||
                            so_addr.GetOffset() == addr_range.GetBaseAddress().GetOffset() + addr_range.GetByteSize())
                        {
                            resolved_flags |= flags;
                        }
                    }
                    else
                    {
                        sc.symbol = nullptr; // Don't trust the symbol if the sections didn't match.
                    }
                }
            }
        }
    }
    return resolved_flags;
}

uint32_t
Module::ResolveSymbolContextForFilePath
(
    const char *file_path,
    uint32_t line,
    bool check_inlines,
    uint32_t resolve_scope,
    SymbolContextList& sc_list
)
{
    FileSpec file_spec(file_path, false);
    return ResolveSymbolContextsForFileSpec (file_spec, line, check_inlines, resolve_scope, sc_list);
}

uint32_t
Module::ResolveSymbolContextsForFileSpec (const FileSpec &file_spec, uint32_t line, bool check_inlines, uint32_t resolve_scope, SymbolContextList& sc_list)
{
    Mutex::Locker locker (m_mutex);
    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::ResolveSymbolContextForFilePath (%s:%u, check_inlines = %s, resolve_scope = 0x%8.8x)",
                       file_spec.GetPath().c_str(),
                       line,
                       check_inlines ? "yes" : "no",
                       resolve_scope);

    const uint32_t initial_count = sc_list.GetSize();

    SymbolVendor *symbols = GetSymbolVendor  ();
    if (symbols)
        symbols->ResolveSymbolContext (file_spec, line, check_inlines, resolve_scope, sc_list);

    return sc_list.GetSize() - initial_count;
}


size_t
Module::FindGlobalVariables (const ConstString &name,
                             const CompilerDeclContext *parent_decl_ctx,
                             bool append,
                             size_t max_matches,
                             VariableList& variables)
{
    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
        return symbols->FindGlobalVariables(name, parent_decl_ctx, append, max_matches, variables);
    return 0;
}

size_t
Module::FindGlobalVariables (const RegularExpression& regex,
                             bool append,
                             size_t max_matches,
                             VariableList& variables)
{
    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
        return symbols->FindGlobalVariables(regex, append, max_matches, variables);
    return 0;
}

size_t
Module::FindCompileUnits (const FileSpec &path,
                          bool append,
                          SymbolContextList &sc_list)
{
    if (!append)
        sc_list.Clear();

    const size_t start_size = sc_list.GetSize();
    const size_t num_compile_units = GetNumCompileUnits();
    SymbolContext sc;
    sc.module_sp = shared_from_this();
    const bool compare_directory = (bool)path.GetDirectory();
    for (size_t i=0; i<num_compile_units; ++i)
    {
        sc.comp_unit = GetCompileUnitAtIndex(i).get();
        if (sc.comp_unit)
        {
            if (FileSpec::Equal (*sc.comp_unit, path, compare_directory))
                sc_list.Append(sc);
        }
    }
    return sc_list.GetSize() - start_size;
}

size_t
Module::FindFunctions (const ConstString &name,
                       const CompilerDeclContext *parent_decl_ctx,
                       uint32_t name_type_mask,
                       bool include_symbols,
                       bool include_inlines,
                       bool append,
                       SymbolContextList& sc_list)
{
    if (!append)
        sc_list.Clear();

    const size_t old_size = sc_list.GetSize();

    // Find all the functions (not symbols, but debug information functions...
    SymbolVendor *symbols = GetSymbolVendor ();

    if (name_type_mask & eFunctionNameTypeAuto)
    {
        ConstString lookup_name;
        uint32_t lookup_name_type_mask = 0;
        bool match_name_after_lookup = false;
        Module::PrepareForFunctionNameLookup (name,
                                              name_type_mask,
                                              eLanguageTypeUnknown, // TODO: add support
                                              lookup_name,
                                              lookup_name_type_mask,
                                              match_name_after_lookup);

        if (symbols)
        {
            symbols->FindFunctions(lookup_name,
                                   parent_decl_ctx,
                                   lookup_name_type_mask,
                                   include_inlines,
                                   append,
                                   sc_list);

            // Now check our symbol table for symbols that are code symbols if requested
            if (include_symbols)
            {
                Symtab *symtab = symbols->GetSymtab();
                if (symtab)
                    symtab->FindFunctionSymbols(lookup_name, lookup_name_type_mask, sc_list);
            }
        }

        if (match_name_after_lookup)
        {
            SymbolContext sc;
            size_t i = old_size;
            while (i<sc_list.GetSize())
            {
                if (sc_list.GetContextAtIndex(i, sc))
                {
                    const char *func_name = sc.GetFunctionName().GetCString();
                    if (func_name && strstr (func_name, name.GetCString()) == NULL)
                    {
                        // Remove the current context
                        sc_list.RemoveContextAtIndex(i);
                        // Don't increment i and continue in the loop
                        continue;
                    }
                }
                ++i;
            }
        }
    }
    else
    {
        if (symbols)
        {
            symbols->FindFunctions(name, parent_decl_ctx, name_type_mask, include_inlines, append, sc_list);

            // Now check our symbol table for symbols that are code symbols if requested
            if (include_symbols)
            {
                Symtab *symtab = symbols->GetSymtab();
                if (symtab)
                    symtab->FindFunctionSymbols(name, name_type_mask, sc_list);
            }
        }
    }

    return sc_list.GetSize() - old_size;
}

size_t
Module::FindFunctions (const RegularExpression& regex,
                       bool include_symbols,
                       bool include_inlines,
                       bool append,
                       SymbolContextList& sc_list)
{
    if (!append)
        sc_list.Clear();

    const size_t start_size = sc_list.GetSize();

    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
    {
        symbols->FindFunctions(regex, include_inlines, append, sc_list);

        // Now check our symbol table for symbols that are code symbols if requested
        if (include_symbols)
        {
            Symtab *symtab = symbols->GetSymtab();
            if (symtab)
            {
                std::vector<uint32_t> symbol_indexes;
                symtab->AppendSymbolIndexesMatchingRegExAndType (regex, eSymbolTypeAny, Symtab::eDebugAny, Symtab::eVisibilityAny, symbol_indexes);
                const size_t num_matches = symbol_indexes.size();
                if (num_matches)
                {
                    SymbolContext sc(this);
                    const size_t end_functions_added_index = sc_list.GetSize();
                    size_t num_functions_added_to_sc_list = end_functions_added_index - start_size;
                    if (num_functions_added_to_sc_list == 0)
                    {
                        // No functions were added, just symbols, so we can just append them
                        for (size_t i=0; i<num_matches; ++i)
                        {
                            sc.symbol = symtab->SymbolAtIndex(symbol_indexes[i]);
                            SymbolType sym_type = sc.symbol->GetType();
                            if (sc.symbol && (sym_type == eSymbolTypeCode ||
                                              sym_type == eSymbolTypeResolver))
                                sc_list.Append(sc);
                        }
                    }
                    else
                    {
                        typedef std::map<lldb::addr_t, uint32_t> FileAddrToIndexMap;
                        FileAddrToIndexMap file_addr_to_index;
                        for (size_t i=start_size; i<end_functions_added_index; ++i)
                        {
                            const SymbolContext &sc = sc_list[i];
                            if (sc.block)
                                continue;
                            file_addr_to_index[sc.function->GetAddressRange().GetBaseAddress().GetFileAddress()] = i;
                        }

                        FileAddrToIndexMap::const_iterator end = file_addr_to_index.end();
                        // Functions were added so we need to merge symbols into any
                        // existing function symbol contexts
                        for (size_t i=start_size; i<num_matches; ++i)
                        {
                            sc.symbol = symtab->SymbolAtIndex(symbol_indexes[i]);
                            SymbolType sym_type = sc.symbol->GetType();
                            if (sc.symbol && sc.symbol->ValueIsAddress() && (sym_type == eSymbolTypeCode || sym_type == eSymbolTypeResolver))
                            {
                                FileAddrToIndexMap::const_iterator pos = file_addr_to_index.find(sc.symbol->GetAddressRef().GetFileAddress());
                                if (pos == end)
                                    sc_list.Append(sc);
                                else
                                    sc_list[pos->second].symbol = sc.symbol;
                            }
                        }
                    }
                }
            }
        }
    }
    return sc_list.GetSize() - start_size;
}

void
Module::FindAddressesForLine (const lldb::TargetSP target_sp,
                              const FileSpec &file, uint32_t line,
                              Function *function,
                              std::vector<Address> &output_local, std::vector<Address> &output_extern)
{
    SearchFilterByModule filter(target_sp, m_file);
    AddressResolverFileLine resolver(file, line, true);
    resolver.ResolveAddress (filter);

    for (size_t n=0;n<resolver.GetNumberOfAddresses();n++)
    {
        Address addr = resolver.GetAddressRangeAtIndex(n).GetBaseAddress();
        Function *f = addr.CalculateSymbolContextFunction();
        if (f && f == function)
            output_local.push_back (addr);
        else
            output_extern.push_back (addr);
    }
}

size_t
Module::FindTypes_Impl (const SymbolContext& sc,
                        const ConstString &name,
                        const CompilerDeclContext *parent_decl_ctx,
                        bool append,
                        size_t max_matches,
                        TypeList& types)
{
    Timer scoped_timer(__PRETTY_FUNCTION__, __PRETTY_FUNCTION__);
    if (sc.module_sp.get() == NULL || sc.module_sp.get() == this)
    {
        SymbolVendor *symbols = GetSymbolVendor ();
        if (symbols)
            return symbols->FindTypes(sc, name, parent_decl_ctx, append, max_matches, types);
    }
    return 0;
}

size_t
Module::FindTypesInNamespace (const SymbolContext& sc,
                              const ConstString &type_name,
                              const CompilerDeclContext *parent_decl_ctx,
                              size_t max_matches,
                              TypeList& type_list)
{
    const bool append = true;
    return FindTypes_Impl(sc, type_name, parent_decl_ctx, append, max_matches, type_list);
}

lldb::TypeSP
Module::FindFirstType (const SymbolContext& sc,
                       const ConstString &name,
                       bool exact_match)
{
    TypeList type_list;
    const size_t num_matches = FindTypes (sc, name, exact_match, 1, type_list);
    if (num_matches)
        return type_list.GetTypeAtIndex(0);
    return TypeSP();
}


size_t
Module::FindTypes (const SymbolContext& sc,
                   const ConstString &name,
                   bool exact_match,
                   size_t max_matches,
                   TypeList& types)
{
    size_t num_matches = 0;
    const char *type_name_cstr = name.GetCString();
    std::string type_scope;
    std::string type_basename;
    const bool append = true;
    TypeClass type_class = eTypeClassAny;
    if (Type::GetTypeScopeAndBasename (type_name_cstr, type_scope, type_basename, type_class))
    {
        // Check if "name" starts with "::" which means the qualified type starts
        // from the root namespace and implies and exact match. The typenames we
        // get back from clang do not start with "::" so we need to strip this off
        // in order to get the qualified names to match

        if (type_scope.size() >= 2 && type_scope[0] == ':' && type_scope[1] == ':')
        {
            type_scope.erase(0,2);
            exact_match = true;
        }
        ConstString type_basename_const_str (type_basename.c_str());
        if (FindTypes_Impl(sc, type_basename_const_str, NULL, append, max_matches, types))
        {
            types.RemoveMismatchedTypes (type_scope, type_basename, type_class, exact_match);
            num_matches = types.GetSize();
        }
    }
    else
    {
        // The type is not in a namespace/class scope, just search for it by basename
        if (type_class != eTypeClassAny)
        {
            // The "type_name_cstr" will have been modified if we have a valid type class
            // prefix (like "struct", "class", "union", "typedef" etc).
            FindTypes_Impl(sc, ConstString(type_name_cstr), NULL, append, max_matches, types);
            types.RemoveMismatchedTypes (type_class);
            num_matches = types.GetSize();
        }
        else
        {
            num_matches = FindTypes_Impl(sc, name, NULL, append, max_matches, types);
        }
    }

    return num_matches;

}

SymbolVendor*
Module::GetSymbolVendor (bool can_create, lldb_private::Stream *feedback_strm)
{
    if (m_did_load_symbol_vendor.load() == false)
    {
        Mutex::Locker locker (m_mutex);
        if (m_did_load_symbol_vendor.load() == false && can_create)
        {
            ObjectFile *obj_file = GetObjectFile ();
            if (obj_file != NULL)
            {
                Timer scoped_timer(__PRETTY_FUNCTION__, __PRETTY_FUNCTION__);
                m_symfile_ap.reset(SymbolVendor::FindPlugin(shared_from_this(), feedback_strm));
                m_did_load_symbol_vendor = true;
            }
        }
    }
    return m_symfile_ap.get();
}

void
Module::SetFileSpecAndObjectName (const FileSpec &file, const ConstString &object_name)
{
    // Container objects whose paths do not specify a file directly can call
    // this function to correct the file and object names.
    m_file = file;
    m_mod_time = file.GetModificationTime();
    m_object_name = object_name;
}

const ArchSpec&
Module::GetArchitecture () const
{
    return m_arch;
}

std::string
Module::GetSpecificationDescription () const
{
    std::string spec(GetFileSpec().GetPath());
    if (m_object_name)
    {
        spec += '(';
        spec += m_object_name.GetCString();
        spec += ')';
    }
    return spec;
}

void
Module::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
    Mutex::Locker locker (m_mutex);

    if (level >= eDescriptionLevelFull)
    {
        if (m_arch.IsValid())
            s->Printf("(%s) ", m_arch.GetArchitectureName());
    }

    if (level == eDescriptionLevelBrief)
    {
        const char *filename = m_file.GetFilename().GetCString();
        if (filename)
            s->PutCString (filename);
    }
    else
    {
        char path[PATH_MAX];
        if (m_file.GetPath(path, sizeof(path)))
            s->PutCString(path);
    }

    const char *object_name = m_object_name.GetCString();
    if (object_name)
        s->Printf("(%s)", object_name);
}

void
Module::ReportError (const char *format, ...)
{
    if (format && format[0])
    {
        StreamString strm;
        strm.PutCString("error: ");
        GetDescription(&strm, lldb::eDescriptionLevelBrief);
        strm.PutChar (' ');
        va_list args;
        va_start (args, format);
        strm.PrintfVarArg(format, args);
        va_end (args);

        const int format_len = strlen(format);
        if (format_len > 0)
        {
            const char last_char = format[format_len-1];
            if (last_char != '\n' || last_char != '\r')
                strm.EOL();
        }
        Host::SystemLog (Host::eSystemLogError, "%s", strm.GetString().c_str());

    }
}

bool
Module::FileHasChanged () const
{
    if (m_file_has_changed == false)
        m_file_has_changed = (m_file.GetModificationTime() != m_mod_time);
    return m_file_has_changed;
}

void
Module::ReportErrorIfModifyDetected (const char *format, ...)
{
    if (m_first_file_changed_log == false)
    {
        if (FileHasChanged ())
        {
            m_first_file_changed_log = true;
            if (format)
            {
                StreamString strm;
                strm.PutCString("error: the object file ");
                GetDescription(&strm, lldb::eDescriptionLevelFull);
                strm.PutCString (" has been modified\n");

                va_list args;
                va_start (args, format);
                strm.PrintfVarArg(format, args);
                va_end (args);

                const int format_len = strlen(format);
                if (format_len > 0)
                {
                    const char last_char = format[format_len-1];
                    if (last_char != '\n' || last_char != '\r')
                        strm.EOL();
                }
                strm.PutCString("The debug session should be aborted as the original debug information has been overwritten.\n");
                Host::SystemLog (Host::eSystemLogError, "%s", strm.GetString().c_str());
            }
        }
    }
}

void
Module::ReportWarning (const char *format, ...)
{
    if (format && format[0])
    {
        StreamString strm;
        strm.PutCString("warning: ");
        GetDescription(&strm, lldb::eDescriptionLevelFull);
        strm.PutChar (' ');

        va_list args;
        va_start (args, format);
        strm.PrintfVarArg(format, args);
        va_end (args);

        const int format_len = strlen(format);
        if (format_len > 0)
        {
            const char last_char = format[format_len-1];
            if (last_char != '\n' || last_char != '\r')
                strm.EOL();
        }
        Host::SystemLog (Host::eSystemLogWarning, "%s", strm.GetString().c_str());
    }
}

void
Module::LogMessage (Log *log, const char *format, ...)
{
    if (log)
    {
        StreamString log_message;
        GetDescription(&log_message, lldb::eDescriptionLevelFull);
        log_message.PutCString (": ");
        va_list args;
        va_start (args, format);
        log_message.PrintfVarArg (format, args);
        va_end (args);
        log->PutCString(log_message.GetString().c_str());
    }
}

void
Module::LogMessageVerboseBacktrace (Log *log, const char *format, ...)
{
    if (log)
    {
        StreamString log_message;
        GetDescription(&log_message, lldb::eDescriptionLevelFull);
        log_message.PutCString (": ");
        va_list args;
        va_start (args, format);
        log_message.PrintfVarArg (format, args);
        va_end (args);
        if (log->GetVerbose())
        {
            std::string back_trace;
            llvm::raw_string_ostream stream(back_trace);
            llvm::sys::PrintStackTrace(stream);
            log_message.PutCString(back_trace.c_str());
        }
        log->PutCString(log_message.GetString().c_str());
    }
}

void
Module::Dump(Stream *s)
{
    Mutex::Locker locker (m_mutex);
    //s->Printf("%.*p: ", (int)sizeof(void*) * 2, this);
    s->Indent();
    s->Printf("Module %s%s%s%s\n",
              m_file.GetPath().c_str(),
              m_object_name ? "(" : "",
              m_object_name ? m_object_name.GetCString() : "",
              m_object_name ? ")" : "");

    s->IndentMore();

    ObjectFile *objfile = GetObjectFile ();
    if (objfile)
        objfile->Dump(s);

    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
        symbols->Dump(s);

    s->IndentLess();
}


TypeList*
Module::GetTypeList ()
{
    SymbolVendor *symbols = GetSymbolVendor ();
    if (symbols)
        return &symbols->GetTypeList();
    return NULL;
}

const ConstString &
Module::GetObjectName() const
{
    return m_object_name;
}

ObjectFile *
Module::GetObjectFile()
{
    if (m_did_load_objfile.load() == false)
    {
        Mutex::Locker locker (m_mutex);
        if (m_did_load_objfile.load() == false)
        {
            Timer scoped_timer(__PRETTY_FUNCTION__,
                               "Module::GetObjectFile () module = %s", GetFileSpec().GetFilename().AsCString(""));
            DataBufferSP data_sp;
            lldb::offset_t data_offset = 0;
            const lldb::offset_t file_size = m_file.GetByteSize();
            if (file_size > m_object_offset)
            {
                m_did_load_objfile = true;
                m_objfile_sp = ObjectFile::FindPlugin (shared_from_this(),
                                                       &m_file,
                                                       m_object_offset,
                                                       file_size - m_object_offset,
                                                       data_sp,
                                                       data_offset);
                if (m_objfile_sp)
                {
                    // Once we get the object file, update our module with the object file's
                    // architecture since it might differ in vendor/os if some parts were
                    // unknown.  But since the matching arch might already be more specific
                    // than the generic COFF architecture, only merge in those values that
                    // overwrite unspecified unknown values.
                    ArchSpec new_arch;
                    m_objfile_sp->GetArchitecture(new_arch);
                    m_arch.MergeFrom(new_arch);
                }
                else
                {
                    ReportError ("failed to load objfile for %s", GetFileSpec().GetPath().c_str());
                }
            }
        }
    }
    return m_objfile_sp.get();
}

SectionList *
Module::GetSectionList()
{
    // Populate m_unified_sections_ap with sections from objfile.
    if (m_sections_ap.get() == NULL)
    {
        ObjectFile *obj_file = GetObjectFile();
        if (obj_file)
            obj_file->CreateSections(*GetUnifiedSectionList());
    }
    return m_sections_ap.get();
}

void
Module::SectionFileAddressesChanged ()
{
    ObjectFile *obj_file = GetObjectFile ();
    if (obj_file)
        obj_file->SectionFileAddressesChanged ();
    SymbolVendor* sym_vendor = GetSymbolVendor();
    if (sym_vendor)
        sym_vendor->SectionFileAddressesChanged ();
}

SectionList *
Module::GetUnifiedSectionList()
{
    // Populate m_unified_sections_ap with sections from objfile.
    if (m_sections_ap.get() == NULL)
        m_sections_ap.reset(new SectionList());
    return m_sections_ap.get();
}

const Symbol *
Module::FindFirstSymbolWithNameAndType (const ConstString &name, SymbolType symbol_type)
{
    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::FindFirstSymbolWithNameAndType (name = %s, type = %i)",
                       name.AsCString(),
                       symbol_type);
    SymbolVendor* sym_vendor = GetSymbolVendor();
    if (sym_vendor)
    {
        Symtab *symtab = sym_vendor->GetSymtab();
        if (symtab)
            return symtab->FindFirstSymbolWithNameAndType (name, symbol_type, Symtab::eDebugAny, Symtab::eVisibilityAny);
    }
    return NULL;
}
void
Module::SymbolIndicesToSymbolContextList (Symtab *symtab, std::vector<uint32_t> &symbol_indexes, SymbolContextList &sc_list)
{
    // No need to protect this call using m_mutex all other method calls are
    // already thread safe.

    size_t num_indices = symbol_indexes.size();
    if (num_indices > 0)
    {
        SymbolContext sc;
        CalculateSymbolContext (&sc);
        for (size_t i = 0; i < num_indices; i++)
        {
            sc.symbol = symtab->SymbolAtIndex (symbol_indexes[i]);
            if (sc.symbol)
                sc_list.Append (sc);
        }
    }
}

size_t
Module::FindFunctionSymbols (const ConstString &name,
                             uint32_t name_type_mask,
                             SymbolContextList& sc_list)
{
    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::FindSymbolsFunctions (name = %s, mask = 0x%8.8x)",
                       name.AsCString(),
                       name_type_mask);
    SymbolVendor* sym_vendor = GetSymbolVendor();
    if (sym_vendor)
    {
        Symtab *symtab = sym_vendor->GetSymtab();
        if (symtab)
            return symtab->FindFunctionSymbols (name, name_type_mask, sc_list);
    }
    return 0;
}

size_t
Module::FindSymbolsWithNameAndType (const ConstString &name, SymbolType symbol_type, SymbolContextList &sc_list)
{
    // No need to protect this call using m_mutex all other method calls are
    // already thread safe.


    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::FindSymbolsWithNameAndType (name = %s, type = %i)",
                       name.AsCString(),
                       symbol_type);
    const size_t initial_size = sc_list.GetSize();
    SymbolVendor* sym_vendor = GetSymbolVendor();
    if (sym_vendor)
    {
        Symtab *symtab = sym_vendor->GetSymtab();
        if (symtab)
        {
            std::vector<uint32_t> symbol_indexes;
            symtab->FindAllSymbolsWithNameAndType (name, symbol_type, symbol_indexes);
            SymbolIndicesToSymbolContextList (symtab, symbol_indexes, sc_list);
        }
    }
    return sc_list.GetSize() - initial_size;
}

size_t
Module::FindSymbolsMatchingRegExAndType (const RegularExpression &regex, SymbolType symbol_type, SymbolContextList &sc_list)
{
    // No need to protect this call using m_mutex all other method calls are
    // already thread safe.

    Timer scoped_timer(__PRETTY_FUNCTION__,
                       "Module::FindSymbolsMatchingRegExAndType (regex = %s, type = %i)",
                       regex.GetText(),
                       symbol_type);
    const size_t initial_size = sc_list.GetSize();
    SymbolVendor* sym_vendor = GetSymbolVendor();
    if (sym_vendor)
    {
        Symtab *symtab = sym_vendor->GetSymtab();
        if (symtab)
        {
            std::vector<uint32_t> symbol_indexes;
            symtab->FindAllSymbolsMatchingRexExAndType (regex, symbol_type, Symtab::eDebugAny, Symtab::eVisibilityAny, symbol_indexes);
            SymbolIndicesToSymbolContextList (symtab, symbol_indexes, sc_list);
        }
    }
    return sc_list.GetSize() - initial_size;
}

void
Module::SetSymbolFileFileSpec (const FileSpec &file)
{
    if (!file.Exists())
        return;
    if (m_symfile_ap)
    {
        // Remove any sections in the unified section list that come from the current symbol vendor.
        SectionList *section_list = GetSectionList();
        SymbolFile *symbol_file = m_symfile_ap->GetSymbolFile();
        if (section_list && symbol_file)
        {
            ObjectFile *obj_file = symbol_file->GetObjectFile();
            // Make sure we have an object file and that the symbol vendor's objfile isn't
            // the same as the module's objfile before we remove any sections for it...
            if (obj_file)
            {
                // Check to make sure we aren't trying to specify the file we already have
                if (obj_file->GetFileSpec() == file)
                {
                    // We are being told to add the exact same file that we already have
                    // we don't have to do anything.
                    return;
                }

                // Cleare the current symtab as we are going to replace it with a new one
                obj_file->ClearSymtab();

                // The symbol file might be a directory bundle ("/tmp/a.out.dSYM") instead
                // of a full path to the symbol file within the bundle
                // ("/tmp/a.out.dSYM/Contents/Resources/DWARF/a.out"). So we need to check this

                if (file.IsDirectory())
                {
                    std::string new_path(file.GetPath());
                    std::string old_path(obj_file->GetFileSpec().GetPath());
                    if (old_path.find(new_path) == 0)
                    {
                        // We specified the same bundle as the symbol file that we already have
                        return;
                    }
                }

                if (obj_file != m_objfile_sp.get())
                {
                    size_t num_sections = section_list->GetNumSections (0);
                    for (size_t idx = num_sections; idx > 0; --idx)
                    {
                        lldb::SectionSP section_sp (section_list->GetSectionAtIndex (idx - 1));
                        if (section_sp->GetObjectFile() == obj_file)
                        {
                            section_list->DeleteSection (idx - 1);
                        }
                    }
                }
            }
        }
        // Keep all old symbol files around in case there are any lingering type references in
        // any SBValue objects that might have been handed out.
        m_old_symfiles.push_back(std::move(m_symfile_ap));
    }
    m_symfile_spec = file;
    m_symfile_ap.reset();
    m_did_load_symbol_vendor = false;
}

bool
Module::IsExecutable ()
{
    if (GetObjectFile() == NULL)
        return false;
    else
        return GetObjectFile()->IsExecutable();
}

bool
Module::IsLoadedInTarget (Target *target)
{
    ObjectFile *obj_file = GetObjectFile();
    if (obj_file)
    {
        SectionList *sections = GetSectionList();
        if (sections != NULL)
        {
            size_t num_sections = sections->GetSize();
            for (size_t sect_idx = 0; sect_idx < num_sections; sect_idx++)
            {
                SectionSP section_sp = sections->GetSectionAtIndex(sect_idx);
                if (section_sp->GetLoadBaseAddress(target) != LLDB_INVALID_ADDRESS)
                {
                    return true;
                }
            }
        }
    }
    return false;
}

bool
Module::LoadScriptingResourceInTarget (Target *target, Error& error, Stream* feedback_stream)
{
    if (!target)
    {
        error.SetErrorString("invalid destination Target");
        return false;
    }

    LoadScriptFromSymFile should_load = target->TargetProperties::GetLoadScriptFromSymbolFile();

    if (should_load == eLoadScriptFromSymFileFalse)
        return false;

    Debugger &debugger = target->GetDebugger();
    const ScriptLanguage script_language = debugger.GetScriptLanguage();
    if (script_language != eScriptLanguageNone)
    {

        PlatformSP platform_sp(target->GetPlatform());

        if (!platform_sp)
        {
            error.SetErrorString("invalid Platform");
            return false;
        }

        FileSpecList file_specs = platform_sp->LocateExecutableScriptingResources (target,
                                                                                   *this,
                                                                                   feedback_stream);


        const uint32_t num_specs = file_specs.GetSize();
        if (num_specs)
        {
            ScriptInterpreter *script_interpreter = debugger.GetCommandInterpreter().GetScriptInterpreter();
            if (script_interpreter)
            {
                for (uint32_t i=0; i<num_specs; ++i)
                {
                    FileSpec scripting_fspec (file_specs.GetFileSpecAtIndex(i));
                    if (scripting_fspec && scripting_fspec.Exists())
                    {
                        if (should_load == eLoadScriptFromSymFileWarn)
                        {
                            if (feedback_stream)
                                feedback_stream->Printf("warning: '%s' contains a debug script. To run this script in "
                                                        "this debug session:\n\n    command script import \"%s\"\n\n"
                                                        "To run all discovered debug scripts in this session:\n\n"
                                                        "    settings set target.load-script-from-symbol-file true\n",
                                                        GetFileSpec().GetFileNameStrippingExtension().GetCString(),
                                                        scripting_fspec.GetPath().c_str());
                            return false;
                        }
                        StreamString scripting_stream;
                        scripting_fspec.Dump(&scripting_stream);
                        const bool can_reload = true;
                        const bool init_lldb_globals = false;
                        bool did_load = script_interpreter->LoadScriptingModule(scripting_stream.GetData(),
                                                                                can_reload,
                                                                                init_lldb_globals,
                                                                                error);
                        if (!did_load)
                            return false;
                    }
                }
            }
            else
            {
                error.SetErrorString("invalid ScriptInterpreter");
                return false;
            }
        }
    }
    return true;
}

bool
Module::SetArchitecture (const ArchSpec &new_arch)
{
    if (!m_arch.IsValid())
    {
        m_arch = new_arch;
        return true;
    }
    return m_arch.IsCompatibleMatch(new_arch);
}

bool
Module::SetLoadAddress (Target &target, lldb::addr_t value, bool value_is_offset, bool &changed)
{
    ObjectFile *object_file = GetObjectFile();
    if (object_file)
    {
        changed = object_file->SetLoadAddress(target, value, value_is_offset);
        return true;
    }
    else
    {
        changed = false;
    }
    return false;
}


bool
Module::MatchesModuleSpec (const ModuleSpec &module_ref)
{
    const UUID &uuid = module_ref.GetUUID();

    if (uuid.IsValid())
    {
        // If the UUID matches, then nothing more needs to match...
        if (uuid == GetUUID())
            return true;
        else
            return false;
    }

    const FileSpec &file_spec = module_ref.GetFileSpec();
    if (file_spec)
    {
        if (!FileSpec::Equal (file_spec, m_file, (bool)file_spec.GetDirectory()) &&
            !FileSpec::Equal (file_spec, m_platform_file, (bool)file_spec.GetDirectory()))
            return false;
    }

    const FileSpec &platform_file_spec = module_ref.GetPlatformFileSpec();
    if (platform_file_spec)
    {
        if (!FileSpec::Equal (platform_file_spec, GetPlatformFileSpec (), (bool)platform_file_spec.GetDirectory()))
            return false;
    }

    const ArchSpec &arch = module_ref.GetArchitecture();
    if (arch.IsValid())
    {
        if (!m_arch.IsCompatibleMatch(arch))
            return false;
    }

    const ConstString &object_name = module_ref.GetObjectName();
    if (object_name)
    {
        if (object_name != GetObjectName())
            return false;
    }
    return true;
}

bool
Module::FindSourceFile (const FileSpec &orig_spec, FileSpec &new_spec) const
{
    Mutex::Locker locker (m_mutex);
    return m_source_mappings.FindFile (orig_spec, new_spec);
}

bool
Module::RemapSourceFile (const char *path, std::string &new_path) const
{
    Mutex::Locker locker (m_mutex);
    return m_source_mappings.RemapPath(path, new_path);
}

uint32_t
Module::GetVersion (uint32_t *versions, uint32_t num_versions)
{
    ObjectFile *obj_file = GetObjectFile();
    if (obj_file)
        return obj_file->GetVersion (versions, num_versions);

    if (versions && num_versions)
    {
        for (uint32_t i=0; i<num_versions; ++i)
            versions[i] = LLDB_INVALID_MODULE_VERSION;
    }
    return 0;
}

void
Module::PrepareForFunctionNameLookup (const ConstString &name,
                                      uint32_t name_type_mask,
                                      LanguageType language,
                                      ConstString &lookup_name,
                                      uint32_t &lookup_name_type_mask,
                                      bool &match_name_after_lookup)
{
    const char *name_cstr = name.GetCString();
    lookup_name_type_mask = eFunctionNameTypeNone;
    match_name_after_lookup = false;

    llvm::StringRef basename;
    llvm::StringRef context;

    if (name_type_mask & eFunctionNameTypeAuto)
    {
        if (CPlusPlusLanguage::IsCPPMangledName (name_cstr))
            lookup_name_type_mask = eFunctionNameTypeFull;
        else if ((language == eLanguageTypeUnknown ||
                  Language::LanguageIsObjC(language)) &&
                 ObjCLanguage::IsPossibleObjCMethodName (name_cstr))
            lookup_name_type_mask = eFunctionNameTypeFull;
        else if (Language::LanguageIsC(language))
        {
            lookup_name_type_mask = eFunctionNameTypeFull;
        }
        else
        {
            if ((language == eLanguageTypeUnknown ||
                 Language::LanguageIsObjC(language)) &&
                ObjCLanguage::IsPossibleObjCSelector(name_cstr))
                lookup_name_type_mask |= eFunctionNameTypeSelector;

            CPlusPlusLanguage::MethodName cpp_method (name);
            basename = cpp_method.GetBasename();
            if (basename.empty())
            {
                if (CPlusPlusLanguage::ExtractContextAndIdentifier (name_cstr, context, basename))
                    lookup_name_type_mask |= (eFunctionNameTypeMethod | eFunctionNameTypeBase);
                else
                    lookup_name_type_mask |= eFunctionNameTypeFull;
            }
            else
            {
                lookup_name_type_mask |= (eFunctionNameTypeMethod | eFunctionNameTypeBase);
            }
        }
    }
    else
    {
        lookup_name_type_mask = name_type_mask;
        if (lookup_name_type_mask & eFunctionNameTypeMethod || name_type_mask & eFunctionNameTypeBase)
        {
            // If they've asked for a CPP method or function name and it can't be that, we don't
            // even need to search for CPP methods or names.
            CPlusPlusLanguage::MethodName cpp_method (name);
            if (cpp_method.IsValid())
            {
                basename = cpp_method.GetBasename();

                if (!cpp_method.GetQualifiers().empty())
                {
                    // There is a "const" or other qualifier following the end of the function parens,
                    // this can't be a eFunctionNameTypeBase
                    lookup_name_type_mask &= ~(eFunctionNameTypeBase);
                    if (lookup_name_type_mask == eFunctionNameTypeNone)
                        return;
                }
            }
            else
            {
                // If the CPP method parser didn't manage to chop this up, try to fill in the base name if we can.
                // If a::b::c is passed in, we need to just look up "c", and then we'll filter the result later.
                CPlusPlusLanguage::ExtractContextAndIdentifier (name_cstr, context, basename);
            }
        }

        if (lookup_name_type_mask & eFunctionNameTypeSelector)
        {
            if (!ObjCLanguage::IsPossibleObjCSelector(name_cstr))
            {
                lookup_name_type_mask &= ~(eFunctionNameTypeSelector);
                if (lookup_name_type_mask == eFunctionNameTypeNone)
                    return;
            }
        }
    }

    if (!basename.empty())
    {
        // The name supplied was a partial C++ path like "a::count". In this case we want to do a
        // lookup on the basename "count" and then make sure any matching results contain "a::count"
        // so that it would match "b::a::count" and "a::count". This is why we set "match_name_after_lookup"
        // to true
        lookup_name.SetString(basename);
        match_name_after_lookup = true;
    }
    else
    {
        // The name is already correct, just use the exact name as supplied, and we won't need
        // to check if any matches contain "name"
        lookup_name = name;
        match_name_after_lookup = false;
    }
}

ModuleSP
Module::CreateJITModule (const lldb::ObjectFileJITDelegateSP &delegate_sp)
{
    if (delegate_sp)
    {
        // Must create a module and place it into a shared pointer before
        // we can create an object file since it has a std::weak_ptr back
        // to the module, so we need to control the creation carefully in
        // this static function
        ModuleSP module_sp(new Module());
        module_sp->m_objfile_sp.reset (new ObjectFileJIT (module_sp, delegate_sp));
        if (module_sp->m_objfile_sp)
        {
            // Once we get the object file, update our module with the object file's
            // architecture since it might differ in vendor/os if some parts were
            // unknown.
            module_sp->m_objfile_sp->GetArchitecture (module_sp->m_arch);
        }
        return module_sp;
    }
    return ModuleSP();
}

bool
Module::GetIsDynamicLinkEditor()
{
    ObjectFile * obj_file = GetObjectFile ();

    if (obj_file)
        return obj_file->GetIsDynamicLinkEditor();

    return false;
}